Analysis of Wear Causes of Damaged Hard Alloy Milling Knives
1. Processing material properties
When cutting titanium alloy, due to the poor thermal conductivity of titanium alloy, the chips are prone to adhere to the vicinity of the cutting edge or form chip deposits, forming high-temperature zones on the front and back cutting surfaces near the cutting edge, causing the loss of tool hardness and increased wear. In continuous cutting under high temperature conditions, the adhesive and fusion materials are subjected to the impact of subsequent processing, and during the forced punching process, they will take away some of the tool material, causing tool defects and damage. In addition, when the cutting temperature reaches 600 ℃ or above, a hardened hard layer will form on the surface of the part, which will have a strong wear effect on the tool. Titanium alloy has a low elastic modulus, large elastic deformation, and a large surface rebound near the back cutting surface, resulting in a large contact area between the processed surface and the back cutting surface and severe wear.
In normal production and processing, severe blade wear occurs when the margin of continuous milling of titanium alloy parts reaches 15mm-20mm. The efficiency of continuing milling is extremely low, and the surface smoothness of the machined parts is poor, which cannot meet production and quality requirements.
3. Improper operation
Improper operations such as improper clamping, unsuitable cutting depth, excessive spindle speed, and insufficient cooling during the production and processing of titanium alloy castings, such as boxes and covers, can lead to tool breakage, damage, and breakage. This type of defective milling cutter not only fails to perform effective milling, but also causes surface defects such as dents on the machining surface due to "gnawing on the cutter" during the milling process, which not only affects the machining quality of the milling surface, but can also lead to the scrapping of the workpiece in severe cases.
When cutting titanium alloy, due to the poor thermal conductivity of titanium alloy, the chips are prone to adhere to the vicinity of the cutting edge or form chip deposits, forming high-temperature zones on the front and back cutting surfaces near the cutting edge, causing the loss of tool hardness and increased wear. In continuous cutting under high temperature conditions, the adhesive and fusion materials are subjected to the impact of subsequent processing, and during the forced punching process, they will take away some of the tool material, causing tool defects and damage. In addition, when the cutting temperature reaches 600 ℃ or above, a hardened hard layer will form on the surface of the part, which will have a strong wear effect on the tool. Titanium alloy has a low elastic modulus, large elastic deformation, and a large surface rebound near the back cutting surface, resulting in a large contact area between the processed surface and the back cutting surface and severe wear.
In normal production and processing, severe blade wear occurs when the margin of continuous milling of titanium alloy parts reaches 15mm-20mm. The efficiency of continuing milling is extremely low, and the surface smoothness of the machined parts is poor, which cannot meet production and quality requirements.
3. Improper operation
Improper operations such as improper clamping, unsuitable cutting depth, excessive spindle speed, and insufficient cooling during the production and processing of titanium alloy castings, such as boxes and covers, can lead to tool breakage, damage, and breakage. This type of defective milling cutter not only fails to perform effective milling, but also causes surface defects such as dents on the machining surface due to "gnawing on the cutter" during the milling process, which not only affects the machining quality of the milling surface, but can also lead to the scrapping of the workpiece in severe cases.
