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What is the difference between a non-standard tool and a normal cutter?

Nov 12, 2018

In the machining process, it is often difficult to process with standard tools. Therefore, the production of non-standard tools is very important for machining. Because the use of non-standard tools for metal cutting is more common in milling, the production of non-standard tools in milling is briefly introduced.

Since the standard tool is made for the cutting of a large number of ordinary metal parts or non-metal parts, the hardness is increased when the workpiece is subjected to heat treatment, or the workpiece is made of stainless steel, etc. It is very easy to stick the knife, and there are some workpiece surfaces. When the geometry is very complicated, or the surface to be machined has a high roughness requirement, the standard tool cannot meet the processing needs. Therefore, in the process of machining, it is necessary to carry out targeted design on the material of the tool, the geometry of the cutting edge, the geometric angle, etc., which can be divided into two categories that do not need to be customized and need to be customized. There is no need to customize the tool to solve two problems, such as size problems and surface roughness problems.

If it is a size problem, you can choose a standard tool whose size is similar to the required size. It can be solved by changing the grinding, but there are two points to note:

1) The difference in size should not be too large, generally not more than 2mm, because the difference in size will cause the groove shape of the tool to change, directly affecting the chip space and geometric angle.

2) If it is an end mill with a cutting hole, it can be changed on a common machine tool, and the cost is low. If it is a keyway cutter without a cutting hole, it cannot be carried out on a common machine tool, and it requires a special five-axis linkage. The cost of grinding on the machine will also be higher.

If it is a surface roughness problem, it can be achieved by changing the geometric angle of the blade. For example, increasing the degrees of the front and back angles will significantly improve the surface roughness of the workpiece. However, if the machine tool of the user is not rigid enough, the edge may be blunt and the surface roughness may be increased. This aspect is very complicated, and the analysis of the processing site is required to reach a conclusion.