What are the factors that affect the service life of forming tools? The manufacturer has something to say

Linear speed has a great influence on tool life. If the line speed is 20% higher than the specified line speed of the sample, the tool life will be reduced to 1/2 of the original; if it is increased to 50%, the tool life will only be 1/5 of the original. To improve the service life of the tool, it is necessary to know the material and state of each workpiece to be processed and the linear speed range of the selected tool. The linear speed of the tool is not the same, and it can be adjusted according to the specific situation during processing to achieve a more ideal effect. The data of the line speed during rough machining and finish machining are not consistent. The rough machining is mainly to remove the allowance, and the line speed should be low; the finish machining is mainly to ensure the dimensional accuracy and roughness, and the line speed should be high.

Forming tool manufacturers say that depth of cut has less impact on tool life than line speed. Each groove type has a relatively large range of depth of cut. During rough machining, the depth of cut should be increased as much as possible to ensure a large stock removal rate; during finishing machining, the depth of cut should be as small as possible to ensure the dimensional accuracy and surface quality of the workpiece. But the depth of cut cannot exceed the cutting range of the groove. If the depth of cut is too large, the tool cannot withstand the cutting force, resulting in tool chipping; if the depth of cut is too small, the tool will only scrape and squeeze the surface of the workpiece, resulting in severe wear of the flank surface, thereby reducing tool life.

There are many reasons for the vibration, including the rigidity of the machine tool, the rigidity of the tooling, the rigidity of the workpiece, the cutting parameters, the tool geometry, the radius of the tool nose arc, the back angle of the blade, the overhang length of the tool bar, etc., but the main reason is that the system is not rigid enough to resist The cutting force during processing causes the tool to vibrate continuously on the surface of the workpiece during processing. To eliminate or reduce vibration must be considered comprehensively. The tool life is greatly reduced.

When processing workpieces, we mainly consider the material of the workpiece, heat treatment requirements, and whether to process intermittently. The blades for processing steel and the blades for processing cast iron, and the blades with processing hardness of HB215 and HRC62 are not necessarily the same; the blades for intermittent processing and continuous processing will not be the same. Steel blades are used to process steel parts, casting blades are used to process castings, CBN blades are used to process hardened steel, and so on. For the same workpiece material, if it is continuous processing, use a blade with higher hardness, which can increase the cutting speed of the workpiece, reduce tool tip wear, and reduce processing time; if it is intermittent processing, use a blade with better toughness. It can effectively reduce abnormal wear such as chipping and improve tool life.

The forming tool manufacturer said that a large amount of heat will be generated during the use of the tool, which will greatly increase the temperature of the blade, and when it is not processed or cooled with cooling water, the temperature of the blade will decrease, so the blade is always in a higher temperature change Within the range, the blade will continue to expand with heat and contract with cold, resulting in fine cracks in the blade. As the blade is used more, the cracks will propagate to other blades, causing the life of other blades to decrease.