Methods to solve problems in polishing

Polishing is the main problem that excessive polishing. The so-called polishing excessive means polishing surface condition and the longer the worse instead. Surface polishing is excessive, often referred to as the following two phenomena: 'orange peel shape layer' and 'pinhole'. Should be noted that usually occurs when using machine polishing bigger opportunities. 1 orange peel shape layer: after polishing, the surface appear orange peel shape irregular peeling, the main reason is that material is qualitative soft, polishing pressure caused by too much, hard material can withstand high polishing pressure, not easy to be polished too. See the polishing surface metamorphism increases polishing pressure to continue polishing, doing so will inevitably increase in surface grinding. Metamorphic to repair after the material surface can adopt the following methods: method 1: adopt the method of fine grinding before polishing to remove surface metamorphic layer, begin again after completion of the final polishing and polishing. When polishing shall use a lower than previous polishing pressure. Method 2: the temperature is lower than the last time the tempering temperature 25 ℃, 45度) Release stress, when repeated before polishing polishing until surface state to achieve is to its meaning. To start polishing, but polishing pressure should be lower than the previous polishing pressure. If the result is not ideal, you should increase the hardness of material, increase hardness has the following methods: mixer can adopt the nitriding and carburizing heat treatment method to increase the surface hardness of steel. 2 pinhole: generally in the polishing process will produce very small pinhole, this is because when a layer has been polished caused by ground slag, the slag content in solid oxide form exists. In the process of common important factors are: mixer polishing time and pressure; Pieces of steel purity, especially on slag content; Mixer polishing tool use; Mixer abrasive why there will be a pinhole one reason is that the parent material and clinker hardness is different. In the process of polishing, grinding to maternal faster than grinding to slag, the speed of the polishing can be gradually to lower ground slag grain grinding out until further polishing surface of other material will be removed, that leaves the pinhole, this problem less than 10 microns, and the rules of abrasive polishing tool is easier to appear when is too soft. Minimize the occurrence of pinhole of one way is to choose the high purity of mould steel, depending on the vacuum exhaust in the process of production and electronic slag refining ( ESR) 。 Also can use the following methods: before polishing, use a soft cutting freely polished stone, and then polished. In pieces when using abrasive rules for 10 microns or less than 10 microns, avoid to use the most soft polishing tool. Polishing time should be as short as possible, using pressure should be less as far as possible.