IE 1225 – Intro. To Manufacturing Engineering

Fall 2007Dr. R. Lindeke

Engineering Design Process1 is a series of iterative steps that engineers and designers take to solve a problem.

• Step 1: Identify the Need or Problem• Step 2: Research the Need or Problem• Step 3: Develop Possible Solutions• Step 4: Select the Best Possible Solution• Step 5: Construct a Prototype• Step 6: Test and Evaluate the Solutions• Step 7: Communicate the Solutions• Step 8: Redesign

1See reference materials: Engineering Design Graphic, J.H. Earle (in library reference section)

Engineering Design

• As an iterative process ED:– a) Starts with an idea – or a customer’s desired

solution– b) Starts with a competitor’s product– Leads through may potential solutions– Chooses from among the potential solutions by

“Fair” tests– A prototype of the chosen solution(s) is produced

for assuring correctness of concept– Design models are finalized, manufactured and

introduced– Product Refinement continues the process

At each step the process can cycle back!

Engineering Graphics

• The communication tools of Engineering Design

• Our “drawings” are used to make clear our solutions to:– Customers– Other Designers (who must interface

with our ‘parts’)– Manufacturing Engineers – Shop Floor Personnel

The purpose of a technical drawing is to DOCUMENT THE DESIGN PORCESS!!!

Role of Drawings

• They are a way to communicate all necessary information about an abstractions an idea or concept

• They are a visual representation of a real entity (in 2- or 3-D) such as a machine part, tool, house, etc.

Specific Need of a Technical Drawing

• They must indicate scale of the entity

• They must indicate dimensions of the Entity (and any applicable tolerable variations from these desired dimensions)

• They should (must!) conform to well established standards of design (and drafting) as developed by ANSI and ISO

Getting Started – In CATIA

Start Part Design with a “Blank Sheet” -- Mechanical Design & Part Design

After we start: Pick a Logical Name Type it in as “New Part”

Tools … Customize … Get the toolbars!

Next: Using “Options” in Tools menu, Set up Parameters/Measure: Units

Set up Grid spacing too – for “Sketcher”

Enter “Sketcher” on a Plane! (here XY plane)

The “Part Tree” – later is where we do most of our Editing!

Notice that in the “Sketcher” the menus and command have changed! The Green Highlighted ICON returns us to the Part Design Environment

Add A Rectangle using Pre-defined Profile ICON (rectangle)

Exit Sketcher and “pad” the rectangle to 3-D

Punch a Hole (in the 3-D part)

If we wished to position a Hole in a specific “Constrained” location we could select the highlighted icon before we are satisfied with the hole

Special holes can also be built!

Manipulating the Design Product Tree

If our part is “Dark Gray” then all the editing tools apply to the product tree – not the part!

We usually get here by accident – reclick on a vertical link in the Tree to get back to the part editor!

Select “Top Face” of part and Re-enter Sketcher

Draw Another Rectangle!

Exit Sketcher and Pad Rectangle to 40 mm

Lets move the Hole to the Center of the Big Rectangle

Double Click Hole Sketch in Product Tree

Double Click Constraints Icon (orange)

Click Left Edge/Hold Shift/Click Rt. Edge; Click Top/Shift/Click Bottom

Click Asterisk/Shift/Click L. Edge

Click Asterisk/Shift/Top Edge

Set Proper Offsets ---

Set for both Vertical and Horizontal Offsets

Set Views with Icon

Or Multi-Views:

In multi-view this compass will move the part in current frame

In single view it maneuvers the part just like the icons or mouse!

Always Use Save Management – then Safe As!