For copper precision parts with high surface quality and appearance precision, grinding production and processing should be carried out according to the precision machining process in order to achieve the quality standard. However, the manufacturing process of general parts can not be mechanically applied, which is not only difficult to solve the problem that the abrasive debris blocks the sand wheel. In addition, the surface of precision parts will be roughened and scratched, resulting in the reduction of precision machining quality. The following describes the precautions for precision copper processing
Precautions For Machining Precision Copper Parts
According to the characteristics of copper, the first thing to consider in the process of processing is its ductility. We all know that the workpiece with better ductility is softer. For soft copper parts, it is difficult to carry out lathe processing, which requires CNC lathe processing of copper parts. There are two very important factors in the processing of copper parts. The first is the feed rate during cutting, and the second is the feed rate during cutting. These two factors are very important, and they are also two key factors specially pointed out in the processing process of copper parts with CNC lathe.
A very important factor of copper is its low hardness, which is very easy to cause problems during processing. The copper is soft, and the chips are easy to bond on the blade, which affects the machining surface quality and the durability of the tool. In addition, the machined workpiece surface is easy to produce water ripple waveform and emit noise. Pure copper has a large expansion coefficient and is easy to deform under the influence of cutting temperature, so it is difficult to control the finishing dimension and geometric accuracy. If pure copper contains such easy cutting elements as sulfur and smash, its machinability will be exposed. The toughness and plasticity of copper are relatively large. Large thermal deformation during cutting requires sharp cutting tools, light cutting, smooth chip removal, and try to reduce the cutting temperature.
When the CNC vertical machining center is used for high-speed milling of copper workpiece, with the increase of cutting speed, the cutting force decreases correspondingly, which greatly reduces the cutting deformation coefficient of copper workpiece. The surface quality of high-speed milling copper alloy is very good, which can save subsequent finishing. When cutting copper machined parts, the surface quality increases with the increase of cutting speed and decreases with the increase of feed speed. However, in high-speed machining, increasing the feed speed has a much smaller impact on the surface quality than in low-speed machining.
Surface Treatment Process Of Copper Parts
Since the copper parts are corrosion-resistant, surface treatment is not required under normal circumstances. However, in order to meet the requirements of the surface treatment for the precision copper parts of customers, let’s take a look at the common surface treatment processes for precision copper parts.
Immerse the parts to be electroplated in an aqueous solution containing the deposited metal compound, and pass the current through the plating solution to precipitate and deposit the electroplated metal on the parts. Generally, galvanizing, copper, nickel, copper nickel alloy, etc. are used for electroplating, and sometimes black boiling (bluing), phosphating, etc. are also included.
- Mechanical plating:
Impact the product surface through the particles of coated metal, and cold weld the coating to the product surface.
- Hot dip galvanizing:
It is completed by immersing carbon steel parts in the bath of molten zinc with a temperature of about 510 ℃. As a result, the iron zinc alloy on the surface of steel parts gradually becomes passivated zinc on the external surface of products. Hot dip aluminizing is a similar process.
The surface treatment process of precision copper parts is the process of forming a coating on the surface of the workpiece through certain methods. Its purpose is to give the precision copper parts beautiful surface and anti-corrosion effect.