Lab. 04. CAM - Computer Aided Manufacturing. ASSEMBLY DESIGN: Application for Part and Fixture Assembly for milling process. Academic Year 2014/2015

Transcription

1 Lab. 04 Academic Year 2014/2015 CAM - Computer Aided Manufacturing ASSEMBLY DESIGN: Application for Part and Fixture Assembly for milling process

2 for Fixturing (Tooling) GOAL: - To be able to Assemble many part into single assembly - To understand the concept of fixturing (especially Principle) OUTLINE: - Introduction: assembly and fixturing - Assembly process in CATIA - Fixturing Elements: Support+Locator+Clamping From CATIA perspective: we are still in CAD Module From Machining Perspective: we are already in CAM framework 2/59

3 3/59 Manufacturing Cycles General Machining Main Machining Types Changing Part Position (Re-Set up part and fixture) Changing Operation in the same Position (no re-set up part and fixture) Turning Phase 1st Pos. 2 nd Pos. Cylindrical Turning Facing Cylindrical Turning Facing Centering Manufacturing Cycle Milling Phase 1 st Pos. Hole Making Flattening Contouring Grinding Phase 1 st Pos. Internal Cylindrical Grinding MACHINE TYPE PART PLACEMENT (ORIENTATION) CUTTING PROCESS (MACHINING)

4 4/59 Manufacturing Cycles focus on milling Phases, sub-phases and operations decomposition. Manufacturing Cycle Turning Phase Our focus is on: Milling Phase 1 st Pos. 2 nd Pos. 1 st Pos. Cylindrical Turning Facing Cylindrical Turning Facing Centering Hole Making Flattening Contouring Grinding Phase MACHINE TYPE 1 st Pos. PART PLACEMENT (ORIENTATION) Internal Cylindrical Grinding CUTTING PROCESS (MACHINING)

5 5/59 NC Manufacturing Designed Part (Final Shape) Working part (RAW Part: block, cylinder, etc) Product Manufacturing Product Equipment (fixture, etc) Settings of the group of operations (Phase) NC Machines Set-up of machining programs Tools Definition of working operations /Tool Creation of CL data (APT) Production of the model Process Post-Processor Start NC macchine Tool

6 6/59 Manufacturing Parts Designed Part (The Final Shape) Raw Part (Workpiece)

7 7/59 NC Manufacturing Design Part Working part (RAW) Product Manufacturing Product Equipment Settings of the group of operations (Phase) NC Machines Set-up of machining programs Tools Definition of working operations /Tool Creation of CL data (APT) Production of the model Process Post-Processor Start NC macchine Tool

8 8/59 Manufacturing Product: Parts + Fixture Principle

9 9/59 Manufacturing Product: Part + Fixture Principle

10 10/59 Fixturing and principle Fixturing: Support (Base) + Locator + Clamping Principle Support: Locator: Clamping:

11 11/59 Other examples of fixturing system Manufacturing Product Clamping

12 Manufacturing Product Manufacturing Product contains: 1. Model of the Final part (Designed Part) 2. Model of the Raw/Semi-finished (Working part or Workpiece) 3. Model of the Fixturing system (Fixture Equipment to block the part). In CATIA framework: Manufacturing Product (Assembly) name.catproduct (1 file) Consists of: Designed Part name.catpart (1 file) Working part name.catpart (1 file) Fixturing Equipment name.catpart (1,,n files) Manufacturing Product (*.CATProduct) 12/59

13 13/59 Manufacturing Product Manufacturing Product is the highest level of data-set in the CATIA Software a CATIA Assembly Manufacturing Product (ASSEMBLY - *.CATProduct) PART 1 (*.CATPart) PART 2 (*.CATPart) PART N (*.CATPart) SUB PRODUCT (ASSEMBLY - *.CATProduct) PART 1 (*.CATPart) PART N (*.CATPart)

14 14/59 Struttura di un documento Product

15 15/59 CATIA - This module is enable us to assemble (join) many parts into one single assembly. - File extension: *.CATProduct - This assembly will be used for CAM module

16 16/59 CATIA The most important tools in CATIA Assembly Module: Note: the most used constraints: Coincidence & Contact Rule/Condition to assemble/join 2 parts into 1 assembly: coincident, contact, etc Function to help move/orient the parts before applying constraint to assemble parts The most helpful

17 17/59 Assembly of the Manufacturing Product Sequence of the assembly (The sequence is following the real assembly process real sequence): Insert the Worktable: Dowel Pin (fixed) Insert Support+Locator elements (Pin and Supports fixed to the table) Insert the Working Piece (RAW) (constrained on Pins and Supports) Inserrt Clamping/blocks (constrained on the table and the part) Insert the Designed Part (final part) (constrained on the RAW)

18 18/59 Assembly constraints Coincidence Contact Offset Angle Fixed Fix togheter Most frequently used Automatic Constraints Change constraints

19 19/59 Coupling Relations Coincidence Allignment: for planar surfaces, lines, pointys, revolved surfaces and axes. Planar Surfaces: same direction of the outgoing normal axis. Revolved Surfaces/Axes: coaxiality. Change Orientation

20 20/59 Coupling Relations Contact Contact: for faces and/or planes, lines, points. Opposite direction of the outgoing normal axis. Change Orientation

21 21/59 Start Mechanical Design 2 Click 1 and then click 2 1 To Insert Part

22 22/59 Insert the Worktable (fixed) Insert fixing elements (Support and Locator fixed to the table) Insert the Working Piece (RAW) (constrained on Supports and Locators) Insert Clamping (constrained on the worktable and the RAW part) Insert the Design Part (final part) (constrained on the RAW)

23 23/59 Existing Component -> then Click on Product1 Open-> Table.CATPart

24 24/59 Fixed Constraint Click on a face of the table The constraint is shown by an anchor

26 26/59 Existing Component -> then Click on Product1 Open -> Pin.CATPart

27 27/59 Manipulation of a Component Click on the icon Manipolation

28 28/59 COINCIDENCE -> Click on the icon Coincidence Select the axis of the hole (click on the cylindrical surface in the internal side of the hole) Select the axis of the Pin by clicking the cylinder

29 29/59 Contact Click on the Contact Icon Select the planar surface to be placed Select the reference surface

30 30/59 Update all Constraints

31 31/59 Open -> Pin.CATPart Open -> Support.CATPart

32 32/59

34 34/59 Open -> Raw.CATPart 3 Contacts Plane-Cilynder (External) (pin) 3 Contacts Plane-Sphere

35 35/59

37 37/59 Open -> Block.CATPart 1 Contact Plane-Plane of table 1 Contact Plane-Plane of workpiece 1 Offset Plane-Axis of the cylinder

38 38/59 1 Offset Plane - Axis of Cylinder

39 39/59

41 41/59 Open -> Final.CATPart - dist. 5 mm on each side from the Workpiece

42 42/59

43 43/59 Properties: Change the product name

44 44/59 File -> save management Prod_Manuf_back.CATProduct -> Sub-Phase 1 To save all files in a single folder

45 45/59 SUMMARY ASSEMBLY DESIGN for Part and Fixturing NC Manufacturing Product Definition: 1. Design the Final Part (Part Design) 2. Design the RAW Part (Part Design) 3. Design the WORKTABLE: Dowel Pin (Part Design) 4. Design the SUPPORT: Pin (Part Design) 5. Design the LOCATOR: Pin (Part Design) 6. Design the CLAMPING (Part Design) 7. Assemble al of the part Manufacturing Part (Assembly)