Analysis of Causes of Wear of Broken Carbide Milling Cutter


Date:

20/04/23

Formed cemented carbide milling cutters are widely used due to their small shape tolerances.

Formed cemented carbide milling cutters are widely used due to their small shape tolerances. Because the blades cannot be replaced directly, most of the milling cutters are scrapped after chipping, which greatly increases the processing cost. 1. Processing material properties When cutting titanium alloys, due to the poor thermal conductivity of titanium alloys, the chips are easy to adhere to the edge of the tool tip or form a built-up edge, and high temperature areas are formed on the front and flank surfaces near the tool tip, making the tool Redness and hardness are lost, and abrasion is intensified. During continuous cutting under high temperature conditions, the adhesive and weld are impacted by the subsequent processing, and part of the tool material will be taken away in the process of being forced to be washed away, resulting in tool defects and breakage. In addition, when the cutting temperature reaches above 600°C, a hardened hard layer will form on the surface of the part, which will cause a strong wear on the tool. Titanium alloy has low modulus of elasticity, large elastic deformation, and large rebound of the workpiece surface near the flank surface, so the contact area between the processed surface and the flank surface is large, and the wear is serious. 2. Normal wear In normal production and processing, when the allowance of continuous milling titanium alloy parts reaches 15mm-20mm, severe blade wear will occur. The efficiency of continuing milling is extremely low, and the surface finish of the processed parts is very poor, which cannot meet the production and quality requirements. 3. Improper operation. In the process of producing and processing titanium alloy casting boxes and lids, improper operations such as improper clamping, improper cutting depth, excessive spindle speed, insufficient cooling and other improper operations will cause the tool to chip, break, and break Wait for the situation. In addition to not being able to effectively mill this kind of defective milling cutters, it will also cause surface defects such as depressions on the machined surface due to "gnawing the cutter" during the milling process, which not only affects the processing quality of the milled surface, but also causes the machined parts to be scrapped in severe cases.

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