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Abrasive flow, fluid polishing, extrusion grinding mold polishing operation mode

2020-10-29 11:51:48

     Abrasive flow, fluid polishing, extrusion grinding mold polishing operation mode


     Mold polishing generally first use coarse oilstone to coarsely polish the surface of the machined mold cavity, polish to remove the knife marks of the machine tool, and then use fine oilstone to polish away the traces of coarse oilstone polishing, and then use fine sandpaper Polish the polished surface of the fine oilstone, and then use polishing paste or abrasive paste to polish the surface of the mold cavity to achieve a mirror-like effect. This is the general process of polishing the mold. Of course, if possible, you can use an ultrasonic polishing machine to polish the mold, which is more efficient. People are also less strenuous.


    To obtain high-quality polishing results, the most important thing is to have high-quality polishing tools and auxiliary products such as whetstone, sandpaper and diamond lapping paste. The choice of polishing procedure depends on the surface condition after pre-processing, such as machining, EDM, grinding and so on. The general process of mechanical polishing is as follows:

    

     ①Rough polishing: The surface after milling, electric spark, grinding and other processes can be polished by a rotating surface polishing machine or an ultrasonic grinding machine with a speed of 35 000-40 000 rpm. The commonly used method is to remove the white EDM layer with wheels with diameter Φ3mm and WA # 400. Then there is manual whetstone grinding, and the strips of whetstone are added with kerosene as a lubricant or coolant. The general order of use is #180 ~ #240 ~ #320 ~ #400 ~ #600 ~ #800 ~ #1000. Whetstone polishing method, this operation is the most important and difficult operation. According to the different specifications of the processed products, the angle of about 70 degrees is respectively cross-polished. The ideal reciprocating range of Zui is about 40mm~70mm. Whetstone operations also vary according to the material of the processed product. Many mold manufacturers choose to start with #400 in order to save time.


     ②Semi-precision polishing: semi-precision polishing mainly uses sandpaper and kerosene. After the whetstone operation is finished, it is sandpaper operation. When sandpaper operation, pay attention to the round edges, round corners and orange peel of the mold core. Therefore, the whetstone process is as fine as possible. Focus on sandpaper polishing. Sandpaper is used with a hard wood stick to grind at an angle of about 70 degrees like a whetstone operation, and the number of grindings with sandpaper is 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 in the processing surface (this is also one of the reasons for the orange peel).


    Generally, bamboo chips are used for sanding. Actually, it is ideal to use wood rods with low elasticity or aluminum rods with low hardness for grinding at an angle of about 45 degrees. Rubber or materials with high elasticity cannot be used for the grinding surface, and sharp angles can be used for shapes that cannot be ground at a 45-degree angle. 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), not pre-hardened steel, because it may cause burns on the surface of the pre-hardened steel.


     ③Fine polishing: diamond polishing paste is mainly used for fine polishing. If the polishing cloth wheel is mixed with diamond abrasive powder or abrasive paste for polishing, the usual polishing order is 9μm(#1800)~6μm(#3000)~3μm(#8000). 9μm diamond abrasive paste and polishing cloth wheel can be used to remove the hair-like wear marks left by #1200 and #1500 sandpaper. Then use sticky felt and diamond paste for polishing, the order is 1μm(#14000)~1/2μm(#60000)~1/4μm(#100000).


     The polishing process with an accuracy requirement of 1μm or more (including 1μm) can be carried out in a clean polishing room in the mold processing workshop. For more precise polishing, a jue-to-clean space is necessary. Dust, smoke, dandruff and saliva can all scrap the high-precision polished surface obtained after hours of work.


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