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The choice of high hardness end mills
For processing high hardness materials, how to choose high hardness end mills tools Woolen cloth?
Release time:
2021-11-19
With the improvement of product precision requirements, the precision requirements for molds are becoming more and more precise. In this way, mold steel is processed after heat treatment, and the hardness is as high as 68 degrees. For processing high hardness materials, how to choose high hardness end mills tools Woolen cloth?
Rough machining die: The main goal of rough machining is to pursue the material removal rate per unit time and prepare the geometric contour of the workpiece for semi-finish machining. During the cutting process, due to the change of the metal area of the cutting layer, the load on the high hardness end mills is changed, which makes the cutting process unstable, the tool wear rate is uneven, and the quality of the machined surface decreases. Many CAM software developed at present can keep the cutting conditions constant through the following measures, so as to obtain good machining quality. Constant cutting load. Through calculation, a constant cutting layer area and material removal rate are obtained, so that the cutting load and the tool wear rate are kept in balance, so as to improve the tool life and processing quality. Avoid sudden changes in the tool feed direction.
Semi-finishing mold: The main goal of semi-finishing is to make the contour of the workpiece flat and the surface finish machining allowance is uniform. This is particularly important for tool steel molds, because it will affect the change of the cutting layer area and the high hardness end mills during finishing. The change of tool load affects the stability of the cutting process and the quality of the finished surface. Rough machining is based on a volume model, and finishing is based on a surface model.
The high-speed finishing strategy of finishing molds depends on the contact point between the tool and the workpiece, and the contact point between the high hardness end mills and the workpiece varies with the slope of the machined surface and the effective radius of the tool. For complex curved surface processing composed of multiple curved surfaces, continuous processing should be carried out in one process as much as possible, instead of processing each curved surface separately, in order to reduce the number of times of raising and lowering the knife. However, due to the change of the surface slope during processing, if only the side-cutting amount for processing is defined, the actual step distance may be uneven on the surface with different slopes, thereby affecting the processing quality.
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