An Article Lets You Know: The Precision Parts Processing Technology of Tungsten Carbide

In the process of carbide processing, the hardness of the tool itself must be higher than the hardness of the workpiece being processed, so the tool material of the current turning of carbide parts is mainly based on high hardness and high heat resistant non-metallic adhesive CBN and PCD (diamond).

The processing technology of precision tungsten carbide parts typically involves the following steps:

1. Material preparation: Select suitable hard alloy materials and cut or forge them into the desired shape according to the design requirements of the parts.

2. Machining: Use cutting tools such as tools, milling cutters, and drills to perform machining operations on the hard alloy materials. Common machining techniques include turning, milling, and drilling.

3. Grinding: Perform grinding operations on hard alloy materials using grinding tools and abrasive particles to achieve higher machining accuracy and surface quality. Common grinding processes include surface grinding, external cylindrical grinding, internal cylindrical grinding, and centerless grinding.

4. Electrical discharge machining (EDM): Use electrical discharge machining equipment to perform EDM operations on the hard alloy materials. This process utilizes electrical sparks to melt and vaporize the metal material on the surface of the workpiece, forming the desired shape and dimensions.

5. Stacking: For complex-shaped or special requirements of hard alloy parts, stacking techniques can be used to assemble multiple component parts together through methods such as brazing or silver soldering.

6. Inspection and debugging: Conduct dimensional measurement, surface quality inspection, and other processes on the finished hard alloy precision parts to ensure they meet the design requirements.

Here are some tips:

1. Hardness less than HRA90 carbide parts, choose BNK30 material CBN tool for large margin turning, the tool does not break, and does not burn.  For cemented carbide parts with hardness greater than HRA90, CDW025 material PCD tool or resin-bonded diamond wheel is generally selected for grinding.

2. In the tungsten carbide precision parts processing more than R3 slot, for processing margin is large, generally first with BNK30 material CBN tool roughing, and then grinding with grinding wheel.  For the small processing allowance, you can directly use the grinding wheel for grinding, or use the PCD tool for copying processing.

3. Carbide roll crescent groove rib processing, the use of CDW025 material diamond carving cutter (also known as flying knife, rotary milling cutter).

For the milling process of carbide parts, according to customer needs, a CVD diamond coated milling cutter and diamond insert milling cutter can be provided for precision parts processing, which can replace electrolytic corrosion and EDM process, improve production efficiency, and product quality, such as CVD diamond coated milling cutter for carbide micro-milling, surface roughness can reach 0.073μm.

The selection of appropriate processing technologies depends on the specific shape, size, and requirements of the parts. It is essential to control the processing parameters strictly for each step to guarantee the final part's quality and precision. Additionally, machining hard alloy parts may require the use of tool materials with high hardness and the application of advanced machinery and processing techniques.