Non customized tools mainly solve two problems: dimension and surface roughness.
1. Size problem.
A standard tool with the size similar to the required size can be selected, which can be solved by grinding. However, two points should be noted: 1) the size difference should not be too large, generally not more than 2 mm, because if the size difference is too large, the groove shape of the cutter will be changed, which will directly affect the chip holding space and geometric angle; 2) if the end mill with a cutting edge hole, it can be used in the ordinary milling If it is a keyway milling cutter without a cutting edge hole, it can not be carried out on ordinary machine tools. If it needs to be grinded on a special five axis linkage machine tool, the cost will be higher.
2. Surface roughness.
It can be realized by changing the geometric angle of the cutting edge. For example, increasing the degree of the front and back angles can obviously improve the surface roughness of the workpiece. However, if the rigidity of the user's machine tool is not enough, the surface roughness may be improved by blunting the cutting edge. This aspect is very complicated and needs to be analyzed before the conclusion can be drawn.
There are three special problems to be solved, i.e. the special shape and hardness of the tool.
1. The workpiece to be processed has special shape requirements.
For example, lengthen the cutting tool, add end teeth reverse R, or have special cone angle requirements, handle structure requirements, edge length size control and so on. If the shape requirement of this kind of tool is not very complicated, it is easy to solve. The only thing to pay attention to is that the processing of non-standard cutting tool is relatively difficult. Therefore, users should not excessively pursue high precision when they can meet the requirements of processing. Because high precision itself means high cost and high risk, which will cause unnecessary waste to the production capacity and cost of the manufacturer.
2. The workpiece to be processed has special strength and hardness.If the workpiece is overheated, and the strength and hardness are high, the general tool material can not be used for cutting, or the tool sticking is severe, it is necessary to put forward special requirements for the tool material. The general solution is to select high-grade tool materials, such as cobalt containing high-speed rigid cutting tools with high hardness to cut quenched and tempered workpiece materials, high-quality cemented carbide cutting tools can be used to process high-quality hard materials, or even milling instead of grinding. Of course, there are also some special cases. For example, when processing aluminum parts, it is not necessarily appropriate to have a kind of superhard tool in the market. Although aluminum parts are generally soft and can be said to be easy to process, the material used for superhard tools is actually a kind of aluminum high-speed steel, which is harder than ordinary high-speed steel, but it will be introduced when processing aluminum parts Because of the affinity between aluminum elements, the tool wear will be aggravated. If you want to get high efficiency, cobalt high speed steel can be used instead.
3. The workpiece to be processed has special chip holding and chip removal requirements.
At this time, less teeth and deeper chip groove should be selected, but this design can only be used for materials that are easy to process, such as aluminum alloy.