How to select workholding tool
How to select workholding tool
The characteristics of CNC machining put forward two basic requirements for the fixture tool.
First, It is necessary to ensure that the coordinate direction of the fixture is relatively fixed with the coordinate direction of the machine tool;
Second, It is to ensure the exact size relationship between the part and the machine coordinate system.
According to the state of the part and the installation requirements of the CNC machine tool, the fixture that can guarantee the processing quality and meet the processing needs should be selected.
In addition to this, consider the following points:
(1) When the part processing batch is not large, combined fixtures, adjustable fixtures and other common fixtures should be used as much as possible to shorten the production preparation time and save production costs. Special fixtures can be considered for batch production, and the structure of the fixture is required to be simple.
(2) The clamping parts should be convenient and reliable, avoid the use of the manual adjustment of the clamping method to shorten the auxiliary time, try to use hydraulic, pneumatic or multi-station fixtures to improve production efficiency.
(3) The fixture used on the CNC，EDM, WEDM machine tool should be able to be installed accurately, ensure the relative position and size of the workpiece and the machine coordinate system, and strive to unify the design basis, process reference and programming origin to reduce the reference misalignment error and NC programming. The amount of computational work.
（4）Minimize the number of clamping times, complete the processing of all parts surface or the processing of most surfaces after one clamping, to reduce the clamping error, improve the mutual positional accuracy between the machined surfaces, and fully improve the efficiency of CNC machine tools.
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