The basic concept of the use of jig for shaft sleeve parts

1. The concept of fixture

In the process of mechanical processing, in order to ensure the processing accuracy, fix the workpiece, so that it occupies a certain position to accept the processing or detection of the process equipment collectively referred to as the machine tool fixture, fixture for short.

2. Requirements for clamping device

1) The clamping process shall not destroy the positioning position of the workpiece in the fixture.

2) The clamping force should be appropriate, not only to ensure the stability of the workpiece positioning in the 

process of processing, but also to prevent excessive clamping force from damaging the workpiece surface or causing excessive clamping deformation of the workpiece.

3) Safe operation and labor saving.

3. Classification of fixtures

1) According to the type of machine tool, it can be divided into: lathe jig, milling machine jig, drilling machine jig, boring machine jig, machining center jig and other machine jig

2) According to the working power source: manual fixture, pneumatic fixture, hydraulic fixture, electric fixture, magnetic fixture, vacuum fixture, automatic clamping fixture

3) According to the degree of universality of machine tools and fixtures:

(1) Universal fixture can be processed within a certain range of different workpiece fixture, such as the three jaw self-centering chuck on the lathe, four jaw single acting chuck. Milling machine flat mouth vice, dividing head, rotary table.

Use occasions, because the use of universal fixture clamping workpiece is time-consuming, complex operation, low production efficiency, and difficult to clamp. Therefore, the general fixture is mainly used for single piece of small batch production, in the mass production of fixed products rarely use the general fixture, and the use of high efficiency special fixture.

② Special fixture is a fixture specially designed for a certain process of a workpiece. High positioning accuracy for mass production.

The group fixture is designed according to the group technology principle. A fixture for group processing. As long as the fixture part of the components slightly changed, you can process the different components in the group.

(4) The combined fixture is a fixture that is easy to be connected and disassembled by the standard fixture parts that can be recycled. Used for new product trial and multi - variety small - batch production.

The accompanying fixture is a fixture used on the automatic line.

4. The function of fixture

1) Ensure the machining accuracy of the workpiece

2) Improve labor productivity and reduce processing costs

3) Expand the technological scope of machine tools and change the use of machine tools

4) Improve working conditions and ensure production safety.