Polishing Knowledge Points Of Vibratory Polishing Machine
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For high-quality polishing, the most important thing is to have high-quality polishing tools and accessories such as oilstone, sandpaper and diamond paste. The choice of polishing procedure depends on the surface condition of the previous processing, such as machining, EDM, grinding and so on. The general process of the Vibratory Polishing Machine is as follows:
1. The surface after rough polishing, electric sparking, grinding, etc. can be polished by rotating surface polishing machine or ultrasonic grinding machine with a rotational speed of 35 000-40 000 rpm. A commonly used method is to remove the white spark layer by using a wheel having a diameter of Φ3 mm and WA #400. Then there is a manual oil stone grinding, strip of oil stone plus kerosene as a lubricant or coolant. The general order of use is #180 ~ #240 ~ #320 ~ #400 ~ #600 ~ #800~ #1000. The oilstone polishing method is the most important and difficult work. According to the different specifications of the processed products, cross-grinding is performed at an angular balance of about 70 degrees.
The most ideal round trip range is about 40 to 70 mm. The oil stone work will also vary depending on the material of the processed product. Many mold makers choose to start with #400 in order to save time.
2. Semi-finishing semi-finishing mainly uses sandpaper and kerosene. After the end of the oilstone operation, it is a sandpaper operation. When sandpaper is used, pay attention to the rounded edge, the rounded corner and the orange peel of the mold. Therefore, the oil stone process is as fine as possible. The focus of sandpaper polishing. The sandpaper is ground with a harder wood bar at an angle of about 70 degrees like the oil stone work, and the sandpaper is polished about 10 to 15 times. If the grinding time is too long, the grinding force of the sandpaper will be reduced, which will cause unevenness of the machined surface.
Generally, bamboo sheets are used for grinding in sandpaper operations. It is most ideal to use a wooden rod with a small material elasticity or an aluminum rod with a low hardness to grind at an angle of about 45 degrees. Rubber or high-elastic materials cannot be used on the ground surface.
Shapes that cannot be ground with a 45 degree angle can be used with sharp angles. The number of sandpaper is: #220~ #320~ #400~#600~#800~#1000~#1200~#1500. In fact, #1500 sandpaper only uses die steel suitable for hardening (above 52HRC), and is not suitable for pre-hardened steel, as this may cause burns on the surface of pre-hardened steel.
3. Fine polishing mainly uses diamond abrasive paste. If the polishing powder is mixed with a diamond abrasive powder or a polishing paste, the usual polishing order is 9 μm (#1800) to 6 μm (#3000) to 3 μm (#8000). The 9μm diamond paste and polishing cloth wheel can be used to remove the hair marks left by #1200 and #1500 sandpaper. The polishing is then carried out using a felt and a diamond paste in the order of 1 μm (#14000) to 1/2 μm (#60000) to 1/4 μm (#100000).
A polishing process with an accuracy of more than 1 μm (including 1 μm) can be performed in a clean polishing chamber in the mold shop. For more precise polishing, an absolutely clean space is required. Dust, smoke, dandruff and saliva can all leave high-precision polished surfaces that are obtained after hours of work.
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|Target Prov.: Manitoba|
Target City : huzhou
Last Update : Apr 10, 2019
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|Item Owner : machineunique|
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