What is the difference between non-standard tools and ordinary milling cutters

In the process of machining, some situations that are difficult to process with standard tools are often encountered. Therefore, the production of non-standard tools is very important for machining. Because the use of non-standard tools in 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 common metal or non-metal parts with a wide range and a large amount, when the workpiece is overheated and the hardness increases, or the workpiece is made of stainless steel, it is very easy to stick to the knife, and there are also some surface of the workpiece. When the geometry is very complex, or the surface to be machined has high roughness requirements, standard tools cannot meet the needs of machining. Therefore, in the process of processing, it is necessary to carry out targeted design for the material of the tool, the geometry of the blade edge, and the geometric angle, etc., which can be divided into two categories: those that do not require special ordering and those that require special ordering. There are two main problems that do not need to be customized for tools, such as size problems and surface roughness problems.

If it is a size problem, you can choose a standard tool with a size similar to the required size, and it can be solved by regrinding, but two points should also be noted:

1) The size difference should not be too large, generally not more than 2mm, because if the size difference is too large, the groove shape of the tool will 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 a common machine tool, and the cost is low. If it is a keyway milling cutter without a blade hole, it cannot be carried out on an ordinary machine tool, and it needs to be carried out on a special five-axis linkage. The cost of changing the grinding on the machine tool 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 degree of the front and rear angles will significantly improve the surface roughness of the workpiece. However, if the rigidity of the machine tool of the user is not enough, the edge may be blunt and the surface roughness can be improved. This aspect is very complicated, and it is necessary to analyze the processing site before drawing a conclusion.