Tungsten Copper Tube Hole Processing Problems

Tungsten copper tube takes advantage of W powder with high purity, high hardness, high strength and excellent wear resistance and Cu powder with high purity and excellent thermal and electrical conductivity, after isostatic pressing, sintering and high temperature copper infiltration process to obtain high-performance composite materials. It has many advantages, such as good performance in arc breaking, thermal conductivity, electrical conductivity, do not soften at high temperature, high metal removal rate, higher surface finish of processing mold, longer service life, which has been widely used in high-voltage discharging tube and high-temperature components. However, it also due to good wear resistance and heat resistance, which is difficult to process and the wall thickness is generally thinner, strength and stiffness are weak, prone to be broken.

Conventional hole processing is to fine bore the inner hole to meet the requirements of the surface roughness; then fed with standard reamer (six teeth). But after processing by this method, the dimensions, shape and precision of the workpiece are difficult to meet the requirements of the drawing. Even some workpieces has been split, the rate of rejects reach 50%-60%, which because of:
1. In the process of inner hole turning, the turning tool is thinner and has bad performance in rigidity, which is vibrating easily and difficult to achieve the required size reaming process;
2. Reaming performed in semi-enclosed space, the chip is more difficult to discharge, prone to accumulation and the bore surface scratches, some minor chips glued to the edge of the hole wall friction will increase the surface roughness; chips even larger particles surface ablation process seriously;
3. Chip jamming in the slot knife cutting force and cutting temperature increases also accelerated tool wear;
4. Reaming margin greater accumulation of excessive force or reaming chips reaming force likely to cause mutation, when it exceeds the ultimate strength of the material of the bursting of the workpiece occurs.

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