In the process of machining, it is often difficult to use standard tools for machining. Therefore, the production of non-standard tools is very important for machining. Since 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 production of standard tools is aimed at the cutting of ordinary metal or non-metal parts with a large area and a large amount, when the workpiece is heat-treated and the hardness increases, or the workpiece is stainless steel, it is very easy to stick to the knife, and there are also some workpiece surfaces When the geometry is very complicated, or the surface to be processed has high roughness requirements, standard tools cannot meet the needs of processing. Therefore, in the processing process, the material of the tool, the geometry of the edge, the geometric angle, etc., need to be designed specifically, which can be divided into two categories: no special ordering and special ordering are required. The tool that does not need to be customized is mainly 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, and it can be solved by changing the grinding, but two points should also be paid attention to:
1) The size difference should not be too large, generally not more than 2mm, because if the size difference is too large, it will cause the tool geometry to change, which directly affects the chip space and geometric angle.
2) If it is an end mill with a blade hole, it can be re-ground on an ordinary machine tool, and the cost is lower. If it is a keyway milling cutter without a blade hole, it cannot be performed on an ordinary machine tool, and it needs to be operated in a special five-axis linkage. The cost of grinding on the machine tool will also be higher.
If it is a surface roughness problem, it can be realized by changing the geometric angle of the blade. For example, increasing the front and back angles will significantly improve the surface roughness of the workpiece. However, if the user's machine tool is not rigid enough, the cutting edge may be blunt but can increase the surface roughness. This aspect is very complicated, and a conclusion can be drawn after analyzing the processing site.
The difference between non-standard tools and ordinary tools
2021 12/27