What are the factors that affect the service life of the forming tool
Release time:
2024-01-04
Line speed has a great influence on tool life. If the line speed is higher than 20% of 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 be only 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 line speed of the tool is not the same, in the processing according to the specific situation to adjust, you can achieve a more ideal effect. The data of line speed in rough machining and finish machining are not consistent. Rough machining is mainly to the allowance, and the line speed is low. Finishing is mainly to ensure dimensional accuracy and roughness, and the line speed is high.
Line speed has a great influence on tool life. If the line speed is higher than 20% of 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 be only 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 line speed of the tool is not the same, in the processing according to the specific situation to adjust, you can achieve a more ideal effect. The data of line speed in rough machining and finish machining are not consistent. Rough machining is mainly to the allowance, and the line speed is low. Finishing is mainly to ensure dimensional accuracy and roughness, and the line speed is high.
Forming tool manufacturers said that the impact of cutting depth on tool life is not as large as line speed. Each type of groove has a relatively large depth of cut range. During rough machining, the cutting depth is increased as much as possible to ensure a large margin removal rate; during finishing, the cutting depth is as small as possible to ensure the dimensional accuracy and surface quality of the workpiece. However, the cutting depth cannot exceed the cutting range of the groove type. If the cutting depth is too large, the tool can not withstand the cutting force, resulting in tool chipping; if the cutting depth is too small, the tool is only scraping and squeezing on the surface of the workpiece, resulting in serious wear on the rear face, thereby reducing tool life.
There are many reasons for vibration, including machine tool rigidity, tooling rigidity, workpiece rigidity, cutting parameters, tool groove, tool tip radius, blade back angle, tool bar overhang length, etc., but mainly due to insufficient rigidity of the system, can not resist the cutting force during processing, resulting in constant vibration of the tool on the surface of the workpiece during processing. To eliminate or reduce vibration to comprehensive consideration. The tool life is greatly reduced.
When processing workpieces, we mainly consider the workpiece material, heat treatment requirements and whether intermittent processing. The blades for processing steel parts 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 for processing steel parts, casting blades are used for processing castings, CBN blades are used for processing hardened steel, etc. For the same kind of workpiece material, if it is continuous processing, to use a higher hardness of the blade, can improve the cutting speed of the workpiece, reduce tool tip wear, reduce processing time; if it is intermittent processing, to use a better toughness of the blade, can effectively reduce the edge of the abnormal wear, improve tool life.
Molding tool manufacturers 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. When not processing or cooling with cooling water, the temperature of the blade will decrease. Therefore, the blade has been in a high temperature change range, causing the blade to expand and shrink continuously, resulting in small cracks in the blade. As the use of the blade increases, the crack will spread to the other blade, resulting in a decrease in the life of the other blade.
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