เทคโนโลยีการสร้ างอุปกรณ์ จับยึด
Types and Functions of
Fixtures
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Fixtures
Classification of Fixtures
Fixtures are normally classified by the type
of machine on which they are used
– Milling fixture
– Latch-radius fixture
– ...
Jig and Fixture Design
• Jig: A device that holds
the work and locates
the path of the tool.
• Fixture: A device fixed
to the worktable of a
machine and locates
the work in an exact
position relative to the
cutting tool.
Fixture แบบง่ าย
Fixtures
Milling fixtures
Fixture
components
Fixture design
considerations
Sequence in
laying out a
fixture
ชนิดของ Fixture
1. Plate Fixture
2. Angle Plate Fixture
- Modified Angle Plate Fixture
3. Vise Jaw Fixture
4. Indexing Fixture
Fixtures: Types of Fixtures
1. Plate fixtures
• Simplest and popular form of fixture
• Made form flat plate
• Varity of clamps
Plate fixtures
Fixtures: Types of Fixtures
2. Angle-plate fixtures
• Used for machine the parts at precise
angle
Fixtures: Types of Fixtures
2. Angle-plate
fixtures
• Used for machine
the parts at
precise angle
Fixtures: Types of Fixtures
3. Vise-jaw fixtures
• Used for machining small parts
• Standard vise-jaws are replaced with jaws
that are formed to fit the part
Fixtures: Types of Fixtures
4. Indexing
fixtures
• Very similar to
indexing jigs
Fixtures: Types of Fixtures
4. Indexing fixtures
• Used for machining parts that have
machined details every spaced
Fixtures: Types of Fixtures
5. Multi-station fixtures and duplex fixtures
• For high-speed, high-volume production
runs, where the machining cycle must be
continuous
Duplex Fixture or Multistation Fixture
ชิ้นงาน
ชิ้นงาน
Fixtures: Types of Fixtures
Profiling fixtures
• To guide tools for
machining contours
that machine cannot
normally follow
Fixture components
• Fixture base
– Fixture components and the workpiece are
usually located on a base, which is
securely fastened to the milling machine
table.
Fixture components
• Clamps
– Clamps counteract forces from the feed of
the table and rotation of the cutter.
Fixture components
• Set blocks
– Cutter set blocks are mounted on the
fixture to properly position the milling cutter
in relation to the workpiece.
เอกสารอ้างอิง
Jigs and Fixtures Design
Second Edition, EDWARD G. HOFFMAN
Chapter 26 Jigs and Fixtures
www.accd.edu/sac/engtech/CADD/Rstrube/TECHNCAL_DRAFTING/Stud
ent%20Tutorial%20Power%20Points/CH26.PPT