SIX WEEK INDUSTRIAL TRAINING REPORT

UNDERTAKEN AT

“MAHINDRA & MAHINDRA”

IN

“SWARAJ TRACTOR DIVISION”

ON

“STUDY, DOCUMANTATION AND ANLYSIS OF MANUFACTURING DIFFERENT TRACTOR

MODELS”

Submitted to: Submitted By:Prof.R.K. Handu Bhavya KapoorDepartment:Mech. Roll No: 2309612

Mech.Engg. 5th Sem.

AMBALA COLLEGE OF ENGINEERING AND APPLIED RESEARCH, DEVSTHALI, MITHAPUR

(AMBALA)

ACKNOWLEDGMENT

Firstly I wish to express my deep gratitude to all the concerned persons without whose generous cooperation &coordination, it would have been very difficult for me to have a successful training experience in the organization.

I would like to thank Mr. J.Singh for giving me a golden opportunity of industrial training, which would help me to enhance my technical skills.

I am extremely grateful to the management of Swaraj Division Mohali for giving me an opportunity to pursue six week industrial training in their reputed organization. This provides me a wonderful & learning experience for me to go through this training.

Finely, I would like to thanks all those colleagues who help me out of intensifying my technical knowledge & provide satisfactory solutions to my all queries.

Name : Bhavya Kapoor Mechanical Engineering

PREFACE

In college and industry student learns about the theoretical subject and generalized practical processes, but now a day the industries are much diversified and specialized, that they required the person very suitably in particular field. Every industry has to give the training to the new recruits before putting them onto job. Due to this reason Mahindra & Mahindra Ltd. Mohali projected a scheme under which students go for industrial for six week.

During this period I have written a report about two week training. This report has been written in simple language according to the steps used in manufacturing of Tractors. Any omissions and suggestions for the important of this report will be highly appreciated.

Name : Bhavya Kapoor Mechanical Engineering

TABLE OF CONTENTS

SWARAJ HISTORY

PTL’S BIRTH

GROWTH OF PTL

INTRODUCTION TO PTL

LIGHT MACHINE SHOP

HEAVY MACHINE SHOP

REFERENCING

HEAT TREATMENT SHOP

ASSEMBLY SHOP

DISMOUNTING

PAINT SHOP

ENGINE TESTING

BIBLIOGRAPHY

SWARAJ HISTORY

The Indian Tractor Industries, as it is now, is a major segment of its

engineering industry. However till 1974, Indian firms assembling semi

knocked down (SKD) kits in collaboration with foreign manufactures met the

tractor requirements of the country largely through imports & partly. Though

the first Tractor Company was set up in India in 1960, but the growth in real

terms started from 1974, when the government banned the import of tractors.

Today India is the largest tractor producing and consuming country. In an

effort to reduce imports & develop indigenous technology, the government,

permitted setting up of the major manufacturing companies.

1. Eicher Good Earth 1960

2. TAFE 1964

3. International Tractors 1965

4. Escorts Tractors 1966

5. Ford Tractors 1971

6. HMT 1973

7. Punjab Tractors 1974

8. Kirloskar 1974

9. Harsha 1975

10. Auto Tractors 1981

11. Universal Tractor 1982

GEOGRAPHICALLY

TERRITORY %age of Domestic Sales

North (Punjab, Haryana & Uttar Pradesh) 32%Central (Madhya Pradesh & Rajasthan) 26%East (Bihar, West Bengal, Orissa & Assam) 10%

West (Gujarat & Maharashtra) 12%South (Andhra Pradesh, Tamil Nadu, Karnataka & Kerala) 20%

SEGMENTWISE

HP Range %age of Total Sale

Up to 30 HP

31-40 HP

Above 40 HP

19%

51%

30%

PTL’S BIRTH

Keeping in mind Punjab agrarian economy it was decided by Punjab

Govt. to encourage the growth of industries which complements Punjab’s

agricultural growth. This task was entrusted to P.S.I.D.C. that was played a

major role in bringing Punjab to threshold of industrial revolution. With the

dual objective of industrial & agricultural growth, P.T.L. was established on

27th June 1974.

LOCATION

The factory is located at S.A.S. Nagar, the important industrial town of

Punjab, 5 kms. from Chandigarh. This factory was among the first to be set up

in this industrial town. The company is managed by board of Directors, while

the day to day operations are managed by Vice Chairman & M.D. of the

company.

GROWTH OF PTL

PUNJAB TRACTOR LIMITED started with an annual capacity of five

thousand tractors & with a capital of Rs. 3.7 crores. It went into commercial

production in the year 1974; its first production was 26.6 BHP tractors given

the name SWARAJ-720. Ever since then P.T.L. has not looked back. In the

first twenty years of existence its capacity has been increased to 24,000 per

annum, which is a considerable achievement by any standards. Besides

tractors, it has added a host of other products to its range, which includes:

Harvesting Combine.

Fork Lifters.

Agriculture implements.

Punjab Tractors Ltd (PTL) is one of the leading manufacturers of tractors in India. PTL has been known as the industry out performer since inception. Even when the industry grew at a CAGR of 6.1% during 1991-2000, PTL grew at the CAGR of 11.9%. In terms of market share, PTL is the second largest player after M & M in FY2001 with a market share of 18.1%. PTL tractors are sold under the ‘Swaraj’ brand name. PTL has strong market share of around 20% in the northern region with the highest share in Punjab and Haryana and 16% in the western regions and southern regions of India. In the east the company accounts for 11% market share. The tractor sales accounted for 83.3% of PTL's turnover in FY2001 whereas the harvester-combines, forklifts and spare parts accounted for the balance. Industry basics The Indian tractor market is dominated by low price, rugged, versatile and low to medium powered tractors; the main reason being the inability of farmers to invest in farm mechanization. Tractors are categorized on the basis of horse power (HP) of the engine. In India, the popular range of tractors is 20-40 HP compared to 60 HP in Europe and 90 HP in the USA.

Though large tractors were economically unviable in India, there has been an increasing demand for high-powered tractors due to soil conditions, particularly in states of MP, Gujarat and Maharashtra. But more recently, higher-powered tractors are also being sold in states like Punjab where it is considered as a status symbol. Tractors available in India are 1/4th of the prices of similar powered tractors internationally or in developed countries. Availability of credit is the most crucial factor impacting tractor demand, as in India 90% of the tractors are financed by bank credit at concessional rates. Increased use of irrigation facilities, shift towards multi-cropping, consolidation of lands holdings, promotion of co-operatives and higher investment in agriculture also contributes to higher tractor demand. The tractor segment comprises players like Eicher, Escorts, HMT, Punjab

Tractors, M&M, TAFE, Sonalika, which control about 98% market share. India is the world’s largest market in tractors since 1996. A few international players like Case New Holland, John Deere and Steyr have also set up facilities in India. But these players have entered the higher-powered category and, thus, pose little threat to the existing players who enjoy advantages of established distribution/service network and strong brand equity. Punjab Tractors is promoted mainly by Punjab State Industrial Development Corporation Limited and has acquired the second highest market share in the tractor segment from 9.1% in 1975. In 1970, PTL had major competition from other companies like Eicher, Tractors and Farm Equipment (TAFE), Mahindra & Mahindra (M&M), Escorts and HMT. PTL is one of the leaders in its business and has put up a heady performance in contrast to other private sector players. As against other players, which report a ROCE of 15% on an average, PTL has consistently remained at about 50% in the last few years though the industry is capital-intensive. Punjab Tractor is the only major tractor company, which entered this business without any foreign collaboration. The company has beefed up its R&D capabilities in the last two to three years. PTL’s Swaraj-735 is in a class of its own and has been benchmarked by its competitors to which 16 new features have been added.

PTL has single – mindedly focused on increasing its market share in tractors. Current Scenario During the first half of 2001-02 PTL increased its market share from 18.5% to 21.4%. With the total industry volumes plummeting by 16.6% the sales of PTL fell only a trifle 3.1%. Under these circumstances, though the revenue has fallen by a 0.38% the operating profitability has risen by 1.03%. PTL garnered the operating margins of 19.4% in the first half of FY2001-02, while the lead players like M&M Escorts and Eicher have reported operating margins of 4.4%, 0.7% and 2.9% respectively. The Net Profit has increased by 1.4% to Rs.564 million and the contribution of 40-50HP tractors has increased by 30%, which indicates higher margins from bigger tractors due to a strong foothold in Punjab and Haryana markets.

SWARAJ’S YEARLY PROGRESS

1965: Govt. of India's research institute (CMERI) at Durgapur initiates design

and development of SWARAJ tractor based on indigenous know-how.

1970: Punjab Govt. through PSIDC acquires SWARAJ tractor's design from

CMERI and establishes Punjab Tractors Ltd. (PTL) for its

commercialization.

1971-73: PTL sets up SWARAJ Project for 5,000 tractors per annum at a

capital outlay of Rs. 37.0 million with an equity base of Rs 11.0 million.

1974: Swaraj 724 (26.5 HP) tractor commercially introduced.

1975: 2nd tractor model SWARAJ 735(39 HP) developed by own R&D,

commercially introduced.

1978: 3rd Tractor model SWARAJ 720 (19.5 HP) developed by own R&D,

commercially introduced. Maiden equity divided declared.

1980: Guided by social concerns and responsibility, PTL takes over PSIDC's

sick scooters unit - Punjab Scooters Ltd. (subsequently renamed as

SWARAJ Automotives Ltd.) India's first Self propelled Harvester Combine -

SWARAJ 8100 developed by own R&D, commercially introduced. SWARAJ

Foundry Division set up in backward area.

1983: 4th Tractor Model - SWARAJ 855 (55 HP) developed by own R&D,

commercially introduced. Expansion of annual capacity to 12,000 tractors per

annum at Plant 1.

1984: SWARAJ MAZDA Ltd. promoted in technical and financial

collaboration with Mazda Motor Corps. & Sumitomo Corpn. Japan for

manufacture of Light Commercial Vehicles. PTL's equity participation is Rs.

30.4 million (29%) and that of Mazda and Sumitomo's Rs. 27.0 million (26%).

1985: SWARAJ Industrial Forklift Trucks developed by own R&D,

commercially introduced.

1986: SWARAJ ENGINES Ltd. promoted in technical and financial

collaboration with Kirloskar Oil Engines Ltd.(KOEL) for manufacture of

diesel engines. PTL's equity participation is Rs. 6.9 million (33%) and that of

KOEL's Rs 3.6 million (17%).

1995: Setup of tractor Plant II at Village Chappercheri with annual capacity

of 12,000 per annum.

1998: Commencement of expansion to 60,000 tractors (30,000 at each plant).

Capital outlay of Rs 1000 million, funded mainly through internal accruals.

1999: 5th and 6th tractor models - SWARAJ 733 (34 HP) & SWARAJ 744

(48 HP) developed by own R&D, commercially introduced.

2000: Expansion of annual tractor capacity to 60,000 completed.

2001: PTL won National Championship trophy in competition organized by

All India Management Association (AIMA) for young managers. Economic

times and Boston Consulting Group selects PTL as one of the India's finest 10

companies out of Economic times top 500 Companies.

2002: Cumulative tractor sales crosses 5,00,000.

2003: PSIDC's disinvestment of its entire Equity holding (23.49%) in PTL in

favour of CDC Financial Services (Mauritius) Ltd. With this, total holding of

CDC & its associates in PTL stands at 28.48%.

2004: 7th & 8th tractor models - Swaraj 939 (41 HP) & Swarj 834 (34 HP)

developed by own R&D, commercially introduced.

2005: PTL disinvested 15,73,000 equity shares of Rs. 10/- each of Swaraj

Mazda Ltd. (constituting approx. 15% of SML's paid up capital) in favour of

Sumitomo Corporation, Japan, a joint venture partner in Swaraj Mazda Ltd. at

a total consideration of Rs. 629.2 million

2007: CDC/Actis Group and Burman Family's disinvestment of their Equity holding in PTL (43.3%) in favour of Mahindra Group (M&M).

M&M made open offer to shareholders for another 20% equity of the Company.

Mahindra Group's equity holding in the Company stands at 64.6%

Cumulative Tractor Sales cross 600,000.

Swaraj Track Type Combine designed and developed by in-house R&D,

commercially launched.

2008: Swaraj 3 Tonne Battery forklift, designed and developed by in-house

R&D, commercially launched

Punjab Tractors Ltd. (PTL) has commercially launched another model -

Swaraj 939 FE at a function in Indore.101 units of this new generation tractor

were delivered to farmers from all over Madhya Pradesh and Chhattisgarh, by

Mr. R.Gopalan, Managing Director, State Bank of Indore in the presence of

PTL's Mr. Yash Mahajan (VC & MD) and Mr. A.M. Sawhney (SVP-Mktg).

Powered by a future ready, fuel - efficient 41 HP SAE, three-cylinder water-

cooled diesel engine, Swaraj 939 FE has a constant mesh gear box, diaphragm

clutch and neutral safety switch. Upgraded variants of this model can also be

supplied as per customer needs/requirements.

RESEARCH AND DEVELOPMENT IN SWARAJ GROUP

Research and development is an integral and sustaining department of any

organization, which want to sustain its place in the ever-developing industrial

environment. The emphasis on research and development in the Swaraj Group

is proved by a long list of new products that have been introduced and

established in the years ever since the establishment of Swaraj Group. There is

a separate research and development unit of the group located at phase 7 of

S.A.S. Nagar (MOHALI). Research work is carried out in this unit and design

work is accomplished presently, the research and development is going on

with various new products.

VARIOUS DIVISIONS OF SWARAJ GROUP:-

Swaraj consists of SIX divisions:

1. Swaraj Tractors Division.

2. Swaraj combine Ltd.

3. Swaraj automotive Ltd.

4. Swaraj foundry division

5. Swaraj Engines Ltd.

VARIOUS DEPARTMENTS IN SWARAJ TRACTOR DIVISION

INTRODUCTION

The manufacturing of Tractor is performed in various steps. It is

manufactured after passing through various processes in various shops. Firstly,

various operations on various parts are performed in the L.M.S. (Light

Machine Section) and H.M.S. (Heavy Machine Section). In H.M.S. generally

there are four major heavy parts that are given proper machining operations.

These include Gear Box Casing, Differential Housing, Trumpet Housing and

Rear Cover. Similarly, in L.M.S. the light parts are given proper machining.

These include various parts such as Gears, Shafts, Cage Assembly casing etc.

In Heat Treatment Shop, the light parts such gears, shafts etc are given

the heat treatment to ensure their strength. Firstly the part after passing

through various operations in L.M.S. is taken to the Heat Treatment Shop.

Here the part is kept in the furnace for suitable time period up to certain high

temperature. Then it is taken to the Quenching tank where it is dipped in the

oil tank. After that it is taken to washing tank for washing of dirt and oil etc.

Then it is taken to the Assembly line.

In Assembly line various parts are being assembled into a single unit

termed “Tractor”. During assembling the various parts are being fitted

according to the stage. This would includes the assembly of important parts

such as Rear Cover, Gear Box, Differential Housing and trumpet Housing.

Firstly the Various sub-parts of the Rear Cover are being fitted. Then the

various parts such as gears, shafts, bearing, oil rings, clutch actuator and

circlip etc are fitted into the Gear Box. After that both the Rear Cover and the

Gear Box are taken to the line where Gear Box if fitted ahead of the

Differential Housing whereas the Rear Cover on the Top. Then various things

such as Brakes, P.T.O. Shaft, Cage Assembly, Trumpet Housing etc are fitted

to the Differential Housing. Then this whole assembly is fitted with the engine

against the Gear Box.

After whole assembly is fitted with the Engine, this assembly is taken to

the Chassis Paint Area where it is washed and dry followed by Paint on the

chassis.

Then the tractor reaches to the Final stage where certain electrical and

other accessories such as Battery with Battery cover, Steering Wheel, radiator

etc are fitted. Proper level of Engine oil is also filled into the Differential and

Gear Box. Greasing of various parts is also performed with Grease Gun. After

that the Tractor is taken out of the line after taken it out from the hooks. This

stage is termed as “Dismounting Stage”.

Then the Testing of the Tractor is performed which include the checking

for vibrations, noise, brakes, oil level and other factors that effects the

performance of tractor.

LIGHT MACHINE SHOP

Introduction: L M S is the largest section of the factory. All transmission

components like shafts and gears used in tractors are manufactured here.

L.M.S comprises of 117 machines. Except the bevel gear generator & gear

shaver, which have been imported from W M W & Churchill of Germany

respectively, all other machines are from HMT Ltd. 160 highly experienced

operators and inspectors manned this shop.

Types of machines:

S.No. M/C Description

Job Operations

Bull Gear Line 1. ECO-5 CNC Bull Gear Turning 2. Broaching machine Bull Gear Cutting Internal Spline 3. Gear hobbing

machineBull Gear Cutting Outer Spline

4. Deburring machine Bull gear For removing rough edges 5. Shaving machine Bull Gear Shaving or finishing

Bull Pinion Shaft Line

6. Center Facing machine

BP shaft Facing, Centering

7. Femco Turning BP shaft Rough, Finish turning (first 4 steps)

8. Femco WNCL-30 BP shaft Rough, Finish turning (next 6 steps)

9. COOPER BP shaft Spline cutting 10. HMT H400 BP shaft Gear cutting

11. Shaving machine BP shaft Shaving

Cage Assembly

12. VMC-40Right cage Drilling, Chamfering,

Grooving, Tapping, Facing

13. Boring machineCage assembly Boring (both sides)

14.Cylindrical Grinding machine

Cage assembly Grinding

15.HMT HMC-320 Cage assembly Cross drilling

Other Machines

16.Lichberr (HMT) Hobbing Gear cutting

17.Cooper Gear idle cluster Cutting

18. Parisuda AHG 80 CNC

Intermediate shaft Grinding

19.HMT Radial drill drilling

20.GCI 300 CNC Bevel Gear Grinding

21.VMC-500 vertical milling machine

Milling, Drilling

22.WIDMA drilling machine

Drilling

23.SPILOTE Copy turning Lathe

24.PS-180 Gear shaper(not

bevel)Spline cutting

DIFFERENT MANUFACTURING OPERATIONS IN L M S:

Facing: It is the operation of finishing the ends of the work to make

the ends flat and smooth and to make the piece of required length.

Under cutting: It is similar to grooving operation but is performed

inside a hole.

Chamfering: It is operation of beveling the extreme end of the

work pieces, chamfer is provided for better look.

Rough turning: In this operation max Metal is removed and very

little over size dimensions are left for further machining.

Finish turning: Here minimum metal is removed and very fine

finish is obtained on the work surface.

Grooving: It is operation of turning the groove or neck in order to

terminate a thread or to provide adequate clearance enable nut to

pass freely on threaded work piece to remove burs and to protect the

work piece from being damaged.

Knurling: It is the process of embossing a diamond shaped regular

pattern on the surface of the work piece using a special knurling tool.

Broaching: It is the method of metal removal by a tool that has

successively higher cutting edges in a fixed path. Each tooth

removes a fixed amount of material.

Drilling: It is the process of making hole in an object by forcing a

drill.

Boring: It is the process of enlarging a hole that has already been

drilled.

Grinding: It is generally used for sharpening the cutting tool,

grinding threads and better surface finish etc.

Shaping: The process of cutting gears on the shaper is known as

Shaping. The tool used in shaping for teeth’s cutting is a multi-point

cutting tool.

Hobbing:

Hob: - Hob is a cutting tool used for cutting gears or similar form

gears by the generating principle.

A Hob resembles a worm in appearance its cutting teeth on the

outside of a cylindrical body following a helical path corresponding to

the thread of a worm. It is useful to think of a hob as a cylinder with a

series of racks being parallel to the hob axis or nearly so and each one

slightly displaced axially with respect to the preceding racks. As the hob

rotates in fixed rotation with the blank each row of teeth successively

cuts the next portion of the gear tooth spaces.

Hobs can be broadly classified as

Single start

Double start

Triple start.

Hob material

1. High speed steel (HSS) - M2

2. HSS with 8% cobalt (M35)

3. Power metallurgy (ASP 30)

4. Carbide.

5. Tool steel.

Gear shaving: Gear shaving is a metal cutting operation for finishing

the gear cutting process.

Shaving is a low pressure, free cutting, finishing operation applied to a hobbed

gear to achieve the following:-

1. Correct eccentricity and errors in index, helix angle and tooth

profile.

2. Improve tooth surface finishing.

3. Maintain tooth size.

4. Eliminate tooth-bearing conditions by producing a crowned tooth

form.

HEAVY MACHINE SHOP (H. M. S.) 

          All heavy casting of tractors is machined in this shop with the help of

variety of special machine (SPM). These machines are tailors made by IIMT

to suit component requirements. In addition, facilities of this shop include

general-purpose turning, drilling and milling machines. About 20 SPM and 30

GPM are installed in a covered area of 47,000 sq. Ft. At a cost of 20 million,

2600 tones of castings are machined every year on a two-shift basis. In

addition to the machining of casting for the tractor, some jobs are also

performed for Swaraj Mazda Limited.

 

COMPONENTS MACHINED IN THE SHOP

Gearbox housing (Material R-33, Casting, 180-230

BHN, 76-Kg wt.).

Differential housing.

Rear cover.

Trumpet housing

DIFFERENT MANUFACTURING OPERATIONS IN HMS:

Milling - It is a process of smoothing a surface by a rotating tool

called milling cutter.

Drilling - It is a process of making holes in workpiece by a tool

called drill.

Boring - It is a process of enlarging a drilled hole.

Tapping - It is a process of putting thread on internal side of

drilled hole. This is done by a tool called tap. Different taps are

available for different pitch angles.

Chamfering - It is a process of making a seat on a drilled hole.

Seat is made either to place head of bolt or for tapping

purposes.

Turning - It is a process of making cuts on a rotating workpiece

in lathe machine.

Grooving - It is a process of making an internal cut in a hole.

Side Milling

Facing

CONCEPT OF DOWELLING

The main aim or purpose of doweling is to act as a guide to the work

piece setting proposes prior to machining. Use of this process helps in

reducing the setting time considerably during machining of heavy

components. It is very difficult to set the work piece in required position prior

to machining, this process is very time consuming, hence when initially the

cast piece is brought dowel holes are drilled which act as the pivot around

which the whole machining takes place. Dowel hole act as the reference point

for machining of all the other holes on the work piece all the operation to be

performed on the work piece are taken in reference to the dowel holes thus the

hole act as the reference to all the operations.

PROCESS OF SETTING PRIOR TO DOWEL

Before the dowelling the cast piece is clamped manually, there are three

points to be touched. It follows the phenomena of 3-2-1, which means that we

have to restrict the motion in three directions i.e. x, y, z direction, two to

restrict horizontal and vertical motion and one act as reference point, this

process is known as “butt and clamp”. By dowelling it is all about locate and

clamp hence there is lot of saving of time.

REFERENCING

Dowel act as reference, all the dimension of the work piece i.e. all the

machining operations are from the reference of Dowel hole.

Types of machines

Sr.No. M/C Description Operations

GearBox Housing

1.HMC (multipurpose machine), HDC Milling, Drilling, Dowel

holes

2.Duplex milling machine (cutter 500 mm, total length made –490 mm, 26 inserts 1 viper (inserts for rough cut, viper for finish)

Milling

3.HMC 500 Internal milling, drilling CD

hole (39 mm for outer, 24.2 for inner),

4.Boring machine Rough Boring

5.Boring machine Finish Boring

6.Turning Lathe Turning

7.Cross hole Drilling

8.HMT HDC-S Drilling (4 holes for

connecting rod 2 inner 2 outside)

9.HMT HMC 500 S Drilling, Spot facing

10.Turning Finish turning

11.Radial drilling machine Drilling, Reaming, Tapping,

Chamfering

TrumpetAssembly

12.Two way boring machine Rough Boring

13.RAYAUTO (7 tools work at a time) Rough turning, Facing

14.Boring machine Finish Boring

15.HMT SBCNC 35 Finishing (outer face)

16.SPM Drilling, Tapping

17.TICO multipurpose machine Milling, Drilling, Tapping

RearCover Assembly

18.Free Spindle SPM Milling(1 Vertical,2

horizontal)

19.CNC milling machine Milling

20Horizontal HC 630 CNC Drilling, Boring, Milling

21.VA 50 Drilling, Milling, Tapping

22.XLO Boring (one way)

Heat Treatment shop

Heat treatment shop plays a very important role in every industry. In

automobile industry all the gear and shafts need to be heat treated to impart

desired strength and increase life of the component. The H.T. shop at PTL is

equipped with several gas carbonizing furnaces, quenching tanks, induction

hardening machines and shot blasting furnaces.

Heat Treatment is an operation or combination of operations involving heating

and cooling of metals and alloys in the solid state to produce certain desired

properties. All the heat treatment processes may be considered to consist of

three main parts:

1. The heating of the metal to pre-determined temperature.

2. The soaking of the metal at that temperature until the structure becomes

uniform throughout the mass.

3. The cooling of the metal at some pre-determined rate to cause the formation

of desirable structures within the metal/alloy for the desired purposes.

PURPOSES OF THE HEAT TREATMENT

Changes in properties result from the micro-structural changes in the material

produced by heat treatment operation. However, these serve one or more of

the following purposes:

1. Improve machinability.

2. Relieve internal stresses.

3. Improve mechanical properties such as ductility, strength, hardness, toughness etc.

4. Change in grain size.

5. Increase resistance to heat and corrosion.

 

METHODS OF HEAT TREATMENT

Various methods depending upon the nature of job .i.e. it material, use etc are

employed for giving then Heat Treatment. These methods used are:

Annealing

Normalizing

Hardening

Quenching

Tempering

Case Hardening

a)carburizing

b)Cyaniding

ANNEALING

Annealing means softening of the material by heating and cooling process.

The cooling stage may be performed by regulating the fall of the temperature

in the furnace or by buried the article in sand or lime, and quenching in oil or

water, according to the material being treated.

NORMALISING

In this process the material is heated steadily through out its mass to just

beyond the critical temperature, and then withdrawn from the furnace and

allowed to cool in still air. With the normalizing process there is not soaking

period, for the work is held at the desired temperature for a period only

sufficient to give uniformity through out the mass.

HARDENING

The operation of hardening is applied to all the tools and some important

machine parts intended for especially heavy duty service, as well as to all

machine parts made of alloy steel. Hardening of steels is done to increase the

strength and wear properties.

QUENCHING

Quenching is the act of rapidly cooling the hot steel to harden the steel. Oil is

used when a slower cooling rate is desired. Oil quenching results in fumes,

spills, and sometimes a fire hazard.

TEMPERING

It is an operation to reduce the internal stress and brittleness. With plain

carbon steel, tempering operation consist in slowly heating the hardened

material from room temperature up to maximum of about 600oC and then

quenching in water or oil, the temperature and length of soaking period being

dependent in service requirement. Thus if plain carbon steel is to be hard

without any appreciable ductility, a temperature of about 150oC will be

required.

CASE HARDENING (CARBURISING)

It is method of producing hard surface on steel. The steel used for this purpose

is usually a low carbon steel of about 0.15% carbon, which does not respond

appreciable to heat treatment. In course of the process, the outer layer is

converted into high carbon steel with a carbon content ranging from 0.9% to

1.2% carbon.

ASSEMBLY SHOP

The Assembly at SWARAJ TRACTOR DIVISION deals

with the assembly of tractor models 722, 724, 733, 735, 744, and

834. Assembly is the joining of various constituents to form a final

product. The assembly process is carried out on the main line, which

has various sub assemblies along its length. Assembly shop can be

divided in two main areas: -

1) Before paint area

2) After paint area.

BEFORE PAINT AREA

The area before painting can further be divided into sub assemblies/

loops namely

Differential loop.

Gearbox loop.

Rear cover loop.

Engine assembly loop.

DIFFERENTIAL LOOP

Differential casting mounted on trolley after washing.

Bull pinion Shaft left and right fitted.

Cage assembly fitted. It consists of:

1. Crown wheel.

2. Tail pinion assembly.

3. Roller bearing.

4. Bevel wheels.

5. PTO shaft fitted.

6. Rear axle/trumpet is fitted.

7. PTO shifter assembly fitted.

8. Gearbox assembly is lifted.

9. Rear cover assembly fitted.

10. Brakes are fitted.

11.Parking brake.

12.Suction pipe

13.PTO cover

14. Trailer hook is fitted.

15. Angle bracket is fitted.

16. Rocket link is fitted.

17. Footboard is fitted.

GEAR BOX LOOP

Gearbox housing mounted on trolley.

Drive shaft & input shaft assembly.

Output shaft assembly.

Lay shaft and connecting shaft assembly

Shifter rod assembly.

Steering assembly.

REAR COVER LOOP

Rear cover mounted on trolley.

Control valve and response valve assembly.

Ram assembly. (This consists of cylinder, piston and piston

rods.)

Testing of hydraulic lift.

ENGINE ASSEMBLY LOOP

Engine mounted on trolley

Dynamo is fitted.

Self-motor is fitted.

Oil pump is fitted.

Front axle beam and bracket is fitted.

Clutch plate is fitted.

After that the chassis is carried to the next level by the lift where

the engine & the 3-point assembly of the tractor along with the other

components are fixed. The parts fitted here are:

3-point linkage which contains the following parts:

Bracket.

Lower link fitted at the left side.

Leveling rod fitted at the right side.

Stabilizer stainer.

Draw bar.

Top link.

Battery frame.

Front frame.

Tie rod attached with the drop arm of the steering system.

Accelerator link.

Delievery pipe.

Engine attachement.

The engine is attached with the chassis system in this level of

assembly. The engine is also carried to this level with the help of the

lift crane, which lifts the engine assembly & delievers it to this level.

Shlug is applied at the corneror we can say at rhe circumference of

the gearbox where engine is attached with studs & bolts. Shlugs

works as gaskets or seals & avoid the oil leakage & water mixing in

the engine. the engine, which is suplied to this level of assemble

where the engine is attached contain the following parts attached on

it:

Front axle.

Extension in the front axle used for the setting of the wheels.

K.P.S.A. (King Pin Shaft Axle) with the wheel disc & nuts

fitted in there for the fitting of the wheels.

Drop arms.

Tie rods.

Bucket.

Clutch plates

Alternator.

Self starter.

Fuel pump.

The above parts are already fitted with the engine when it

comes to the engine chassis assembly. The make of the engine is

KIRLOSKOR or SWARAJ KIRLOSKOR depending upon the

model as 3-cylinder, 2-cylinder or 1-cylinder. The engine was

imported from this company from Pune. SWARAJ also has its own

engine plant where the engines are assembled. After assembling the

chassis & engine arrangement, the fitments are checked by the

workmen appointed there at this level & if there is some part

missing, it is attached here. Then the whole assembly is mounted

over the conveyor, which takes that piece to different chambers of

washing, drying, primering, baking, painting & again baking.

After painting the conveyor takes the assembled piece to the DISMOUNTING STAGE where different parts & components are fitted on the tractor & the tractor was completed. After that the testing of the tractor is done. A tractor has to pass through different tests to claim itselfs to be as perfect & if there is some problem coming out in this stage, the tractor is send to the recovery shop, where the problem of the tractor is recovered. After the recovery the tractor is again tested & after passing the test the tractor finally send to the yard from where it is send to the R & D Complex for further tests.

PICTURES OF ASSEMBLED DIFFERENTIAL

DISMOUNTING STAGE:

After the processes of washing, drying, painting, baking, the

assembled piece is finally arrived to the DISMOUNTING STAGE

through conveyor. This dismounting stage is further divided into

different small stages & in each stage, 2 persons works at a time, on

an assembled piece of chassis & engine. The work is divided

between these 2 men at the different stages. The dismounting stage

is divided into 5 different stages in which the parts of the tractor are

fitted on the assembled piece of chassis & engine & in every 6

minutes, we got a complete tractor, which is removed from the

conveyor of the dismounting stage.

STAGE 1:

Alternator connection

Horn

Brake rod

Brake switch connection

Fan belt

STAGE 2:

Speedometer wire

Rear frame

Fuel tank

Overflow pipes

Felt pads

STAGE 3:

Fan

Radiator

Hose pipes

Dash board (it mainly has instrumental panel which con-

tains engine oil meter, fuel gauge, ampere meter, temper-

ature gauge, speedometer)

Dash board cover

Number plate

STAGE 4:

Battery

Steering wheel

Head lights

Clutch connection

Hooks and side panel

Knobs and covers

Sealings

STAGE 5:

Seat

Sheet metal covers (side panel covers, side shield, bon-

net, front grill)

Fenders

Tyres fixing

Batter cover

Torque checking

Engine oil pouring and greasing

Charts and stickers

After completing all the above stages the tractor reaches the

point where it is removed from the conveyor, which is known

as the DISMOUNTING STAGE of the tractor. A platform is

there & when the tractor reaches the platform the conveyor is

removed & the tractor is free. After that the tractor slides down

the platform & reaches the stage, which is the final stage after

the dismounting of the tractor. This stage comes before the

testing of the tractor. In this following functions & equipments

are fitted on the tractor:

Air cleaner

Exhaust

Front tyres distance check and adjust

PAINT SHOP             

Paint Shop is the place where the different sheet metal components are painted.

They are made to pass through various chemicals before they are actually painted.

The painting method opted is that of Spray Painting.

 

NEED FOR PAINTING

Long life

Rust resistance

Better look (more appealing)

The various operations performed in paint shop are:

Surface Preparation (Pre Treatment Cell) - carried out for sheets and rims.

Painting – JOST 1(dash board, rear frame, front shield, top bonnet), JOST

2(fenders, side panel), CHASIS BOOTH (washing, primer, washing zones),

FINAL TOUCH UP.

Inspection

Rejection (Reprocessing)-for sheets and rims.

 

PAINTING

The process (sheet and rim painting) includes

Full Primer + one coat of paint (30-40 microns)

Flash off (This is the distance given so as to allow paint to dry)

Baking (120-130 degree centigrade)

Rubbing

Cleaning with tag rag

Final painting

Flash off

Baking

CHASIS PAINTING

Washing

Drying

Primer painting

Flash off

Final painting

Flash off

Baking

  After painting inspection is carried out inspection is carried out and the product is

passed or rejected.

Various parameters checked are:

Depth of penetration of paint

Thickness of paint coating

Smoothness

ENGINE TESTING

After assembly engine is brought to engine testing section. In this section practical checking of engine is done on the engine and water supply is connected to it then the engine is started with external battery power supply. There the proper operating of valves is done, the engine is kept running for two hours. During running the load is also varied and various properties like lubricating oil pressure, load capacity, fuel consumption etc is checked.

The lubricating oil pressure in the engine should be 3.8to 4.2kg/cm2 for proper working load capacity of engine is checked by applying load on the shaft of the engine through water. Brake dynamometer in which water is applied on the roller when is turn the pressure of shaft water. Pressure is controlled by lever. The load is applied in such a way that max, rpm of engine cover by 200.

Supplying a measured quantity of fuel usually also checks the fuel consumption of the engine 100cc of diesel or fuel is supplied to the engine. The time taken by the engine to consume the fuel is noted. During the testing, the engine is kept on load.

FOR TESTING ENGINE IS KEPT RUNNING FOR 1 HOUR AND 55 MINUTES.

BIBLIOGRAPHY

My training was the most versatile experience. I had the pleasure to do

the work with one of the most reputed factory in their field- “PUNJAB

TRACTORS LTD.” I received the blend of experience in Private as well

as in Govt. sector. It was a good learning time during my training as we

were fortunate to be placed in the department related to manufacturing. I

feel training has give me exposure to undergo projects in the

Manufacturing field as well help me a lot to understand the company

work culture, working with teams and much more. In the end I will like

to thank all persons who helped me throughout my training to enhance

my experience. I also pay my regards to my Lecturers for their guidance

during my training and my Academics helped me to do a lot during my

training.

BHAVYA KAPOOR

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