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Matters needing attention in abrasive flow and fluid polishing Ⅱ

2020-11-30 11:30:09

    Matters needing attention in abrasive flow and fluid polishing Ⅱ


    Ⅱ Pay attention to the following points in diamond grinding and polishing:


    ① This kind of polishing must be carried out under lighter pressure, especially when polishing pre-hardened steel parts and polishing with fine abrasive paste. When polishing with #8000 abrasive paste, the usual load is 100~200g/cm2, but it is difficult to maintain the accuracy of this load. To make this easier, you can make a thin and narrow handle on the wooden strip, such as adding a copper sheet; or cut a part of the bamboo strip to make it softer. This can help control the polishing pressure to ensure that the mold surface pressure is not too high.


    ② When using diamond grinding and polishing, not only the working surface is required to be clean, but the hands of workers must also be carefully cleaned.


    ③The polishing time should not be too long each time, the shorter the time, the better the effect. If the polishing process is too long, it will cause "orange peel" and "pitting".


    ④ In order to obtain high-quality polishing results, polishing methods and tools that are prone to heat should be avoided. For example: polishing with a polishing wheel, the heat generated by the polishing wheel can easily cause "orange peel".


    ⑤ When the polishing process is stopped, it is very important to ensure that the surface of the workpiece is clean and carefully remove all abrasives and lubricants. Then a layer of mold anti-rust coating should be sprayed on the surface.


     Since mechanical polishing is mainly done manually, polishing technology is still the main reason that affects polishing quality. In addition, it is also related to the mold material, the surface condition before polishing, and the heat treatment process. High-quality steel is a prerequisite for obtaining good polishing quality. If the surface hardness of the steel is uneven or there are differences in characteristics, polishing difficulties will often occur. Various inclusions and pores in the steel are not conducive to polishing.

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     ⑶The influence of different hardness on the polishing process


     The increase in hardness increases the difficulty of grinding, but the roughness after polishing decreases. As the hardness increases, the polishing time required to achieve a lower roughness increases accordingly. At the same time, the hardness increases, and the possibility of over-polishing is reduced accordingly.


     ⑷The influence of the surface condition of the workpiece on the polishing process


     In the crushing process of the cutting machine processing, the surface layer will be damaged due to heat, internal stress or other factors, and improper cutting parameters will affect the polishing effect. The surface after EDM is more difficult to grind than the surface after ordinary machining or heat treatment. Therefore, before the end of EDM, it should be trimmed with precision EDM, otherwise the surface will form a hardened thin layer. If the electric spark trimming rules are not selected properly, the depth of the heat-affected layer can reach 0.4mm. The hardness of the hardened thin layer is higher than that of the substrate and must be removed. Therefore, a rough grinding process is added to completely remove the damaged surface layer and form an evenly rough metal surface, which provides a good foundation for polishing process.


     The most important point in super mirror polishing is the size of the polishing. The distance from oilstone grinding to mirror polishing is 10µ. (The ideal is #1500(#1000) Whetstone to start grinding. The number of sandpaper is: (#320 ~ )#400 ~ #600 ~ #800 ~ #1000 ~ #1200 ~ #1500~ #01~ #02 ~ #03~ #04~ #05~ #06~ #015) The basic principle of zui, before proceeding to the next step, the mold must be thoroughly cleaned to achieve good results. Be very careful not to make repeated changes (repeated changes will affect quality issues).

    

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