Chapter 27 Workholding Devices for Machine Tools. Workholding Devices INTRODUCTION. MET Manufacturing Processes.
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1 MET Manufacturing Processes Chapter 27 Workholding Devices for Machine Tools Before you begin: Turn on the sound on your computer. There is audio to accompany this presentation. Chapter 27-1 Workholding Devices Introduction Workholding device locates work in machine tool with respect to the cutting tool. Critical for repeatability. Trend toward flexibility: family of parts and manufacturing cells. Primary functions: Locating Clamping Chapter 27-2 INTRODUCTION Fixture Specialized workholding device that holds workpiece during machining or assembly operations and establishes size dimensions. Jig A special type of fixture that, through built-in features, determines both location and size dimensions that are produced by machining or fastening operations. Chapter
2 INTRODUCTION Fixture size Jig location and size Chapter 27-4 FIXTURE DESIGN Chapter 27-5 FIXTURE DESIGN Chapter
3 FIXTURE DESIGN 1. Locating function is to orient and position workpiece in the machine tool: Provides positive location for the 12 degrees of location freedom: o o Linear: X, Y, Z Rotational: A, B, C Location by principle Chapter FIXTURE DESIGN 3 Points 2Points 1 Points Chapter 27-8 FIXTURE DESIGN 1. Locating (continued): Repeatability: fool proofing. Low profile: clear cutting path. Chapter
4 FIXTURE DESIGN 1. Locating (continued): Cutting forces: press part into locators. Accommodation: allowing workpiece variance. Chapter FIXTURE DESIGN Chapter FIXTURE DESIGN 2. Clamping Function to hold and/or maintain location: Adequate: balance strength & deflection. Reliability: repeatable clamping forces. Clamping forces: toward locators. Loading/Unloading time: dependent on clamp type. Chapter
5 FIXTURE DESIGN 3. Other Design Factors: Chip disposal and removal: heat and interference concerns. Ruggedness Construction ease Ergonomics and safety Flexibility Chapter JIG DESIGN 4. Additional Jig Functions: Location - position geometric shapes with respect to each other. Size - size of geometric shapes. Dimension control. Examples: Drill jig Welding jig. Chapter JIG DESIGN Drill Bushings: Press Fit Slip Fit Chapter
6 TYPES of JIGS Plate jig - plate w/drill bushings and locating pins, clamped to part. Channel jig - part in open side, locate on outside of part. Ring jig - for end/surface of round parts. Diameter jig - for cylindrical surfaces. Leaf jig - hinged leaf or cover. Box jig - boxlike construction, tumble. Assembly jig - welding or riveting, open frame typically. Chapter TYPES of JIGS Chapter TYPES of JIGS Chapter
7 TYPES of FIXTURES Fixtures categories include: Vises Lathe chucks and collets Faceplate fixtures Milling and grinding fixtures Modular fixtures Chapter TYPES of FIXTURES Chapter TYPES of FIXTURES Chapter
8 TYPES of FIXTURES Chapter TYPES of FIXTURES Example of a Lathe Faceplate Fixture Chapter TYPES of FIXTURES Example of Multiple Parts on Single Fixture Chapter
9 MODULAR FIXTURES Modular fixtures provide versatility and adaptable to different workpieces. Chapter MODULAR FIXTURES Chapter MODULAR FIXTURES Chapter
10 MODULAR FIXTURES Chapter MODULAR FIXTURES Chapter ASSEMBLY FIXTURES Chapter
11 MASTER (GROUP) FIXTURES Used for part families: Group Technology (GT) concept. Chapter MASTER (GROUP) FIXTURES Chapter CLAMPING Chapter
12 CLAMPING Chapter CLAMPING Fixture types which used other clamping methods: Magnetic chucks - ferromagnetic materials only. Electrostatic chucks - conductive materials only. Vacuum chucks. Chapter CLAMPING Chapter
13 CLAMPING Permanent- Magnetic Chucks Chapter CLAMPING Electro-Magnetic Chucks Chapter CLAMPING Chapter
14 ECONOMICS of FIXTURES Chapter ECONOMICS of FIXTURES Chapter FIXTURING EXAMPLE Chapter
15 FIXTURING EXAMPLE Chapter The End See Oncourse for Videos Chapter
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