Transcript A jig - วิศวกรรม การ ผลิต
เทคโนโลยีการสร้างอุปกรณ์จับ ยึด Types and Functions of Jigs
อ.ธรรม ์ณชาติ วันแต่ง สาขาเทคโนโลยีการผลิต มหาวิทยาลัย ราชภัฏเพชรบูรณ์
Objectives
• Identify the classes of jigs and fixtures • Identify the types of jigs and fixtures • Choose a class and type of jig and fixture for selected operations on sample parts
Jigs and Fixtures
The difference between jig and fixture • Both jigs and fixtures hold, support, and locate the workpiece • • • The difference is in the way the tool is guided to the workpiece.
A jig
guides the cutting tool
A fixture
references the cutting tool
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.
Jigs and Fixtures
The difference between jig and fixture
Jigs
Classes of Jigs Jigs may divided into two general classes – Boring jigs: used to bore holes or drill in odd size – Drilling jigs: used to drill, ream, tap, chamfer, counterbore, countersink, reverse spotface, or reverse countersink The difference is in size of bushing used
Jig งานเจาะ รีมเมอร ์ ต๊าปเกลียว ลบมุม เคาเตอร ์ บอร ์ เคาเตอร ์ซิงค ์
Drill Jig
Drill Jig
Jigs
Types of Jigs Jigs divided into two general types – Open jigs: for the parts machined only in one side – Closed jigs: used for parts machined on more than one side
Channel Jig
• Channel jigs • Simplest form of box jigs • Work is held between two sides and machined from the third side
Jigs :
Types of Jigs
Template jigs • Normally used for accuracy rather than speed • Fits over the work, not usually clamped • Least expensive and simplest
Template Jig
Plate Jig
Similar to template jigs Built-in clamps
Table Jig
• Plate jigs • Sometime made with legs called
table jigs
Sandwich Jig
• Sandwich jigs • Form of plate jig with a back plate • To prevent bending or warping for thin or soft parts
Angle Jig Modified Angle Jig
• Angle-plate jigs • To hold pars that are machined at precise angle to their mounting locators
Box Jig
• Box jigs • Usually totally surround the part completely machined on every surface
Box Jig
Box Jig
Leaf Gig
Leaf jigs • Small box jigs with a hinged leaf to allow for easier loading and unloading
Leaf Gig
Indexing Jig
Indexing jigs • Used to accurately space holes around a part • Reference itself • Larger indexing jigs are called
rotary jigs
Diameter Jig
Jigs :
Types of Jigs
Trunnion jigs • Form of rotary jig for very large or odd shaped parts
Jigs :
Types of Jigs
Pump jigs • Commercially made jigs that must be adapted by user • Very fast load and unload
Jigs :
Types of Jigs
Multi-station jigs • Made in any of the forms of jigs • Commonly used on multiple-spindle machines
Drill Jig Components
•
Drill bushings
Precision tools that guide cutting tools such as drill and reamers into precise locations in a workpiece.
Drill Jig Components
• •
Jig body
– Holds the various parts of a jig assembly.
Cap screws and dowel pins
– Hold fabricated parts together
Drill Jig Components Screws and Bolt
Drill Jig Components
•
Locating devices
– Pins, pads, and recesses used to locate the workpiece on the jig.
Drill Jig Components
•
Clamping devices
Drill Jig Components
•
Locking pins
– Inserted after the first hole is drilled to lock or hold the workpiece securely to the jig plate while subsequent holes are being drilled.
Dimensioning Jig Drawings
แบบร่าง jig ก่อนท างาน
เอกสารอ้างอิง