What are the factors that affect the life of molding tools?

Line speed has a large effect on tool life. If the line speed is higher than the sample specified line speed of 20%, the tool life will be reduced to the original 1/2; if increased to 50%, the tool life will be only 1/5 of the original To improve the service life of the tool, we need to know the material of each type of workpiece being machined, the state of the tool as well as the choice of the range of line speed. The linear speed of the tool are different, according to the specific circumstances of the processing to adjust, you can achieve a more satisfactory results. Line speed in roughing and finishing data is not consistent, roughing to remove the main margin, line speed to be low; finishing to ensure that the main dimensional accuracy and roughness, line speed to be high.

Forming tool manufacturer said that the depth of cut on tool life is not as big as the linear speed. Each groove type has a relatively large depth of cut range. When roughing, the depth of cut is as large as possible to ensure a large margin removal rate; when finishing, the depth of cut is as small as possible to ensure the dimensional accuracy and surface quality of the workpiece. However, the depth of cut should not exceed the cutting range of the groove type. If the depth of cut is too large, the tool can not withstand the cutting force, resulting in tool chipping; if the depth of cut is too small, the tool is just scraping and squeezing the surface of the workpiece, resulting in serious wear of the back face, thus reducing tool life.
There are many reasons for vibration, including machine rigidity, rigidity of the workpiece, workpiece rigidity, cutting parameters, tool groove type, tip radius, insert back angle, toolbar extension length, etc., but mainly due to the system rigidity is not enough to resist the cutting force during machining, resulting in non-stop vibration due to the tool on the surface of the workpiece during machining. To eliminate or reduce vibration to be considered comprehensively. So that the tool life is significantly reduced.

Workpiece processing, we mainly consider the workpiece material, heat treatment requirements and whether intermittent processing. Processing steel and cast iron blade, processing hardness of HB215 and HRC62 blade are not necessarily the same; intermittent processing and continuous processing with the blade will not be the same. Processing steel parts to use steel inserts, processing castings to use casting inserts, processing hardened steel to use CBN inserts and so on. For the same kind of workpiece material, if it is continuous processing, to use the higher hardness of the insert, can improve the cutting speed of the workpiece, reduce the tip of the knife wear, reduce the processing time; if it is intermittent processing, to use better toughness of the insert, can effectively reduce the collapse of the edge of the blade and other abnormal wear and tear, and improve the service life of the tool.

Forming tool manufacturer said that the tool use process will produce a lot of heat, so that the blade temperature rises dramatically, and not processed or cooled with cooling water, and will make the blade temperature reduction, so the blade has been in a higher range of temperature changes, so that the blade non-stop thermal expansion and contraction, resulting in small cracks in the blade. With the increased use of the blade, the cracks will be extended to other blades, resulting in a reduction in the life of other blades.