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CNC machine can process high-gloss mirror directly

wallpapers Industry 2020-02-25 PDF Format

At present, CNC high-gloss machining technology (milling, turning) is not well known to technicians in most industrial industries. The actual work shows that they are really in the hands of only a few manufacturing companies. The main reason is that the previous demand is not very strong, of course, it is also closely related to cognition. Today we are fortunate enough to find out. Let's take a look at the CNC milling high-gloss shell



In recent years, with the development of high-performance, high-precision CNC machine tools and the emergence of excellent metal cutting tools, CNC high-gloss machining has made great breakthroughs. Milling (turning) has become possible and has become the machining industry Successive goals. The principle of CNC high-gloss machining is to achieve a shiny surface effect on precision CNC machining equipment by using special special tools and scientific and reasonable cutting parameters and processes.
【Machine Tool】
The use of precision CNC machine tools is a prerequisite for high-gloss machining. The machine tool must have good rigidity and precision, such as a precision CNC precision engraving machine (generally speed: 20000 rpm).
【Toolings】
The high-gloss effect is achieved thanks to the use of diamond tools. Diamond tools are standard equipment in the CNC high-gloss machining industry.
A good diamond tool edge does not see any burrs under a high-power microscope. The cutting edge can withstand long-term cutting without change. The friction coefficient between diamond and non-ferrous metals is very small, chips are not easy to stick to the cutting edge, and no built-up edge is generated. Therefore, the cutting edge is always directly cut to the workpiece during machining, and the brightness can be guaranteed.
The cutting edge of the high-gloss milling tool is relatively wide, and uses a small rake angle or a negative rake angle and a near-zero cutting angle. When the high-gloss milling process is performed, the tool performs high-speed cutting on the one hand, and the tool rake angle is small on the other Therefore, the cutting edge of the tool forms a scraping and squeezing effect on the surface being processed, which makes the surface of the workpiece obtain a high smoothness and produces a hardened layer, which improves the surface hardness and wear resistance of the workpiece.
In addition to the geometry of the workpiece, the geometry of the tool mainly depends on the physical characteristics of the material of the workpiece. When machining plastic materials such as copper, aluminum, and nickel, the front angle of the tool is 0º, and the rear angle is generally between 5º and 10º. The radius of the tool tip arc is usually 0.5 ~ 5mm. For high machine rigidity, a larger radius can be used to reduce the surface roughness of the workpiece. If a smaller tool tip radius is used, the feed amount must be reduced to prevent the surface roughness from deteriorating. . When machining inferior materials such as silicon, germanium, CaF2 and ZnS, the rake angle of the tool is generally selected between -15º ~ -45º. The optimal rake angle depends not only on the material itself, but also on the stiffness of the machine tool and the clamping system, which is best determined by production tests.
For high-gloss milling, a disc milling cutter is used. The diameter of the cutter head is based on the size of the plane being milled, and as large as possible, it has better rigidity and good positioning accuracy of the insert. The size of the cutter head will change the texture and effect of the plane being milled. The number of blades can be single or multiple. However, it is more difficult for multiple blades to adjust the consistency of each blade.
Diamond tools look expensive and require a large investment, but natural diamond has extremely high hardness and is very wear-resistant. According to statistics, the life of diamond turning tools is 25 times that of high-speed steel turning tools, and each diamond cutting tool can be reground 6 to 15 times. Therefore, the tool consumption per part is minimal, and stable size and high brightness can be obtained.

[Workpiece]
Materials suitable for high-gloss machining include aluminum, copper, and stainless steel. When machining aluminum, its brightness is the brightest, and the wear of the tool is the smallest. When machining copper, its brightness is relatively light, and the wear of the tool is second. When machining stainless steel, its brightness is gray and matte, and the wear on the tool is also large.

 


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Tag: cnc machinin