What are the common methods and requirements for cnc clamping workpieces?

There are several common ways to use CNC clamp workpieces:

1. the vise directly clamps the clamp. 
  This type of clamping is the simplest, most convenient and most economical way to clamp in CNC milling. In order to locate the reference and the design reference and the process reference coincide, the soft jaws are roughly milled and finished once before machining to ensure the parallelism of the machined two jaws and the vertical of the other two axes of the machine. Degree, the accuracy of the positioning reference is very high, and the resulting positioning error is far less than the requirements of the part itself. The clamping method requires less auxiliary time, convenient clamping, and saves the manufacturing cost and manufacturing time of the fixture, and is widely used in small batch production and single piece trial production.

2. Press the clamp with the pressure plate.
  This type of clamping is the most commonly used clamping method in CNC milling. Since the clamping force generated by the direct clamping of the vise is relatively large, the deformation of the part occurs, and even if the clamping force is adjusted, the deformation problem cannot be avoided. The clamp type clamping method has low manufacturing cost, short time period and simple structure, but the clamping method has a long clamping time, and the part processing needs two clamping to complete, the skill is high, and the clamping force is required. Properly prevent deformation of parts.

3. Use tooling to clamp parts.
  The clamping method commonly used for complex parts. The clamping method has high manufacturing cost, long tooling time period and complicated structure, but the clamping method has short clamping time, convenient and convenient clamping, and is suitable for mass production and processing.

4. Vise and V-block clamping.
  Generally used for small parts, the size of the outer part is less than 15mm. Due to the small size of the parts, it is impossible to use the above three methods to clamp, and the multi-step processing is performed on the ordinary milling machine, and all the parts are completed on the CNC machine. Machining the content, and finally cutting the part with a saw blade.

The cnc clamping workpiece requires the following:
1. The clamping device must not affect the feeding, and the processing part should be open.

2, must ensure the minimum clamping deformation, to ensure the accuracy of parts.

3, convenient loading and unloading, auxiliary time is as short as possible, when there are conditions, parts with larger batches should use pneumatic, hydraulic clamp or multi-station fixture.

4. For small parts or parts with short process time, consider processing several parts or dozens of parts at the same time on the workbench. To improve efficiency.

5, the fixture structure should be simple to reduce the cost of fixture manufacturing. When the parts are processed in small quantities, try to use combination fixtures, adjustable fixtures and other common fixtures; when the parts are produced in batches, special fixtures should be considered, but the cost can be reduced.