Anyone who knows something about CNC tools should know several kinds of tool holders, as well as some basic tools. However, for the detailed classification of tool holders, the advantages and disadvantages of the major tool holders, I believe that everyone should not be so comprehensive. Let me introduce to you. The first is a relatively old-fashioned knife handle, a side-fixed knife handle, which uses two screws to fix the tool, which is simple and fast, and has a strong clamping force. But the versatility is not very good. Each tool holder can only be equipped with tools with the same neck.

Hot-expanded knife handle, you can see from the name, using the method of thermal expansion and cold contraction, heating to a certain degree of heat, the clamping part of the knife handle is slightly enlarged. Put the tool in. The tool is fixed after cooling. Its advantage is high accuracy, generally within 2um. The clamping force is relatively large, the support is good, and the radial runout is 2um-5um. However, each tool holder can only be equipped with a tool of one shank diameter. In addition, heating is required every time the tool is changed, which will cause greater damage to the tool holder. If it is a Nissan product, it can only be used about 200 times, and if it is a German product, it can generally only be used about 600 times.

There is also a hydraulic tool holder. I personally think that the design principle of this tool holder is very interesting. Using a hydraulic fixed tool holder, the precision is very high and the surface runout is generally 2um. The clamping force is very large, the rigidity is good, and it can transmit higher clamping torque. But he has a very heartbreaking shortcoming, that is, the price is too expensive, it can be said that it is the most expensive knife handle.

There is also the cold press/GP tool holder that is slowly popular now. The way it is installed is machine-mounted. The machine pushes the tool up with great force. Because its surface is coated, it is durable. Very high, generally more than 20,000 times. Its clamping force is also very large. The disassembly and assembly time is short, and the circumferential radial runout is 0.003mm.

There are also many kinds of tool holders, such as the most used collet chuck holders, which are fixed by collet chucks. There are also tapping tool holders that use screws to fix the tool and so on.

Copyright: Libo Tool