Basic knowledge of fixture design

A good machine tool fixture must meet the following basic requirements:

1. The key to ensuring the machining accuracy of the workpiece is to correctly select the positioning datum, positioning method and positioning components. If necessary, it is necessary to analyze the positioning error, and pay attention to the influence of the structure of other parts in the fixture on the machining accuracy. Influence, to ensure that the fixture can meet the machining accuracy requirements of the workpiece.

2. The complexity of the special fixture for improving production efficiency should be adapted to the production capacity. Various fast and efficient clamping mechanisms should be used as much as possible to ensure convenient operation, shorten auxiliary time and improve production efficiency.

3. The structure of the special fixture should be simple and reasonable, and it is easy to manufacture, assemble, adjust, inspect and maintain.

4. The tooling fixture with good performance should have sufficient strength and rigidity, and the operation should be simple, labor-saving, safe and reliable. Under the premise of objective conditions and economical application, pneumatic, hydraulic and other mechanized clamping devices should be used as much as possible to reduce the labor intensity of the operator. The tooling fixture should also be convenient for chip evacuation. If necessary, a chip removal structure can be set up to prevent chips from damaging the positioning of the workpiece and damage to the tool, and to prevent the accumulation of chips from bringing a lot of heat and causing deformation of the process system.

5. Good economy The special fixture should use standard components and standard structure as much as possible, and strive to be simple in structure and easy to manufacture, so as to reduce the manufacturing cost of the fixture. Therefore, the necessary technical and economic analysis of the fixture scheme should be carried out according to the order and production capacity in the design, so as to improve the economic benefits of the fixture in production.