sbs-mill.ppt

8/16/2019 sbs-mill.ppt

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Types of Milling Machine1.Column and Knee Type2.Manufacturing of Fixed Bed Type

3.Planer Type

.!pecial Purpose type


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1.Column and Knee Type"and Milling machinePlain Milling machine

#ni$ersal Milling machine

%mni$ersal Milling machine&ertical Milling machine


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Continue'Column and Knee Type Milling Machine Main shape of column (nee type of milling machine is

sho)n in Figure. This milling machine consists of a *aseha$ing di+erent control mechanisms housed there in.

The *ase consists of a $ertical column at one of its end.

There is one more *ase a*o$e the main *ase andattached to the column that ser$es as )or(ta*le e,uipped)ith di+erent attachments to hold the )or(piece. This*ase ha$ing )or(ta*le is identi-ed as (nee/ of themilling machine.

0t the top of the column and (nee type milling machinesare classi-ed according to the $arious methods ofsupplying po)er to the ta*le di+erent mo$ements of theta*le and di+erent axis of rotation of the main spindle. These are descri*ed in *rief as *elo).


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Head Milling Machine

In case of head milling machine feedmotion is given by hand and movements

of the machine are provided by motor.This is simple and light duty millingmachine meant for basic operations.

Plain Milling Machine

Plain milling machine is similar to handmilling machine but feed movement canbe powered controlled in addition tomanual control.


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#ni$ersal Milling Machine

0 uni$ersal milling machine is named so as it

is used to do a large $ariety of operations. Thedistinguishing feature of this milling machineis it ta*le )hich is mounted on a circulars)i$eling *ase )hich has degree graduations.

The ta*le can *e s)i$eled to any angle uptoo on either side of normal position. "elicalmilling operation is possi*le on uni$ersalmilling machine as its ta*le can *e fed tocutter at an angle. Pro$ision of large num*erof auxiliaries li(e di$iding head $erticalmilling attachments rotary ta*le etc. ma(e itsuita*le for )ide $ariety of operations.


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%mni$ersal Milling Machine

%mni$ersal milling machine is li(e a uni$ersalmilling machine )ith additional feature that itsta*le can *e tilted in a $ertical plane *ypro$iding a s)i$el arrangement at the (nee.

This ena*les it to ma(e taper spiral groo$es inreamers *e$el gears etc.

&ertical Milling Machine

Position of spindle is (ept $ertical orperpendicular to the )or(ta*le in case of$ertical milling machine.


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1

Horizontal Milling Machine


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2.Manufacturing of Fixed Bed Type!implex Milling Machine4uplex Milling Machine

Triplex Milling machine


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Fixed Bed Type 5t is also (no)n as manufacturing type milling

machine. 5ts ta*le is mounted directly on the )ays of-xed *ed. Ta*le mo$ement is restricted toreciprocation only. Cutter is mounted on the spindlehead )hich can mo$e $ertically on the column.

4uplex milling machine has dou*le spindle heads oneon each side of the ta*le.

Triplex milling machine has three spindle heads oneeach side of the ta*le and third one is mounted on thecross rail


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3.Planner Type MilingMachine5t is a hea$y duty milling machine its spindle

head is ad6usta*le in $ertical and trans$ersedirections. 5t is di+erent from planner as feedis gi$en to the )or(ta*le.

This can accommodate a num*er ofindependent spindles carrying milling cutterson the rail. 5ndependent dri$ing of thedi+erent spindles is possi*le so multipleoperations are possi*le simultaneously


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.!pecial Type Millingmachine These are the special purpose milling machines entirely

di+erent in design and construction from the con$entionalmilling machines.

5n case of 7otary ta*le milling machine face milling cuttersare mounted on t)o or more $ertical spindles and a

num*er of )or(pieces are clamped on the hori8ontalsurface of a circular ta*le )hich rotates a*out a $erticalaxis. 4i+erent milling cutters are mounted at di+erentheights. 9oading and unloading are possi*le )hile millingis in progress.

5n case of drum milling machine the )or(ta*le rotatesa*out a hori8ontal axis and is called drum. 5n a planetarymilling machine the )or( is held stationary )hile there$ol$ing cutters in a planetary path


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5t is used to -nish cylindrical surface of a)or(piece internally or externally or *oth.

Pantograph milling machine reproduced the)or(piece at any desired scale of pre:decidedmodel.

Pro-ling machine duplicates full si8e of the

template attached to the machine. Tracer milling machine can produce any pre:

decided irregular or complex shapes of diesmoulds *y synchroni8ing mo$ements of the

cutter and tracing elements


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BaseGives support and

rigidity to machine Acts as reservoir for

cutting fluids

Column face Precision-machined and

scraped section used tosupport and guide kneewhen moved vertically

KneeHouses feed

mechanism Attached to column face

and moved vertically

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Saddlen top of knee!oved in or out "y

means of cross feed

hand wheel #manually

or automatically$Swivel ta"le housing%astened to saddle on

universal milling

machine&na"les ta"le to "e swiveled '() either side of

centerline


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Ar"or support%itted to over arm and

can "e clamped Aligns and supports

various attachments

&levating screwGives upward ordownward movement toknee and ta"le#manually orautomatically$

Spindle speed dialSet "y crank used to

regulate spindle speed

1<


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KneeMo$es up and

do)n on face ofcolumn

!upports saddleand ta*le

4oes not containgears forautomatic feed


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Ar"ors*sed for mounting milling cutter +nserted and held in main spindle "y draw "olt

Shell-end mill ar"orsPermit face milling hori,ontally or vertically%it into main spindle


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Collet adaptersused for mounting drills or other tapered-shank

tools in main spindle of machine or vertical millingattachment

uick-change adapter !ounted in spindlePermits such operations as drilling. "oring. and

milling without change in setup of workpiece


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&ise

Chuc(s

7otating ta*les

0ngle plates!pecial -xtures

#ni$ersal di$iding head

Modular -xturing systems

Clamp )or( to ta*le


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2;

Plain vise/aws parallel or 01) to a2is of spindle


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2=

Swivel "ase viseCan swivel through 341) in hori,ontal plane


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*niversal viseCan swivel through 341) in hori,ontal plane and

tilted from 1) to 01 in vertical plane


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Terminology for a face:milling cutter.


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Nomenclature of a common milling cutter


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Left hand spiral right hand spiral

Left hand cutter right hand cutter

Left and right hand cutters.

HelicalPlain

Milling Cutters. a ) Helical b ) Plain


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Collet


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Fig.11 Tapers used for Milling machine arborrs


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Fi Typical milling arbors


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FiTypical Collet typesMilling machine adapters Chuc adapter

!dapters

"uic change adapter and tool holder.


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Face milling

?nd milling

Key)ay cutting

4o$etail cutting

T:slot and circular slot cutting

Many facing operations done)ith @y tool

Aear cutting

4rilling

Boring

ig *oring


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aD !chematic illustration of con$entional milling and clim* milling. *D la*:milling operation sho)ing depth:of:cut d E feed per tooth f E chip depth:of:cut t cE and )or(piece speed v . cD !chematic illustration of cutter tra$el distance

lc to reach full depth:of:cut.


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Cutting direction- Depending on the orientation of the workpiece feedw.r.t. the rotation of the cutting tool.

# Climb (Down) Milling $ Ma%imum thicness of chip at start of cut.

# Conventional (Up) Milling $ Ma%imum thicness of chip at end of cut


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Figure 2. Face:milling operation sho)ing aD action of an insert inface millingE *D clim* millingE cD con$entional millingE dD dimensionsin face milling. The )idth of cut w, is not necessarily the same as thecutter radius.


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!ome *asic types of milling cutters and milling operations. aD Peripheralmilling. *D Face milling. cD ?nd milling. dD Ball:end mill )ith indexa*le

coated:car*ide inserts machining a ca$ity in a die *loc(. eD Milling asculptured surface )ith an end mill using a -$e:axis numerical control machine.

!P?C5F5C0T5%! %F 0 M5995A


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!P?C5F5C0T5%! %F 0 M5995AM0C"5?

0long )ith the type of a milling machine it has to *especi-ed *y its si8e. Aenerally si8e of a typical millingmachine is designated as gi$en *elo) G

aD !i8e dimensionsD of the )or(ta*le and itsmo$ement range ta*le length Hta*le )idth as

> H2= mm.

Ta*le mo$ements G 9ongitudinal tra$el HCross H&ertical as; H 2 H mm.

0*o$e tra$els indicate maximum mo$ement in a

direction.

*D um*er of feeds a$aila*le specify their $aluesD. cDum*er of spindle speeds specify their $aluesD.


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Cutters for aD straddle milling *D form milling cD slotting and dD slitting )ith a

milling cutter.


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