1️⃣ Selection
The first is to choose different materials (copper, aluminum, stainless steel) according to the demand of different diameters of materials
2️⃣ Heat treatment
The wire is heated for a period of time and then cooled slowly to adjust the crystalline structure, reduce the hardness of the wire, and improve the workability of the wire at normal temperature
3️⃣ Acid treatment
Pickling removes the oxide film on the wire surface so that the wire can be processed more easily
4️⃣ Processing
According to the requirements of the drawings, the processing is divided into four stages.
1. In the roughing stage, most of the machining allowance of each machining surface of the chip is left for finishing.
2. In the finishing stage, large machine cutting speed and small machine cutting depth are adopted.
3. Polishing stage, mainly used to reduce the surface roughness value.
4. Ultra-precision machining stage, machining precision 0.1-0.01μm, surface roughness ra≤0.001μm processing stage.
5️⃣ Electroplating
Through the principle of electrochemistry, another metal is generated on the surface of the screw, to prevent the screw rust, prolong the service life, but also to achieve beautiful effect. Usually this step takes 1.5 to 2 hours and a small screw is created.
6⃣️ Recycling
The chips left over from processing are recycled. In the process of metal cutting, a large number of metal chips will be produced. The chip has certain recycling value.
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