Mechanical polishing technology of TC4 titanium bar and titanium alloy bar
Titanium rod polishing is generally carried out on a machine equipped with a rotating grinding wheel (or grinding wheel). At present, more and more belt polishers are used for polishing, and special equipment such as rotating drum and oscillating polisher can also be used for polishing. The latter is commonly used for polishing a small batch of parts. It can use the existing machine tool to polish on the machine tool equipped with a rotary grinding wheel or polishing wheel. The grinding wheel is made of the abrasive particles glued on the elastic wheel by the adhesive. the grinding wheel, abrasives play a lot of roles in the cutting effect of a single knife. The size of abrasives is selected according to the requirements of the machining surface, usually, 120, 180, 220, 320 μ and other different precision gold steel sands are selected. The abrasives can be alumina (including melted, sintered or natural), corundum, plastic, quartz, ceramics, etc., and can be mixed with a single variety or several kinds. The shape of these Abrasives can be made into dihedral, cylindrical, diamond and so on. The reason why they are made into preformed Abrasives first is that they are more economical and faster than materials with special shape and natural shape. According to the shape and size of the workpiece, choose different shapes and sizes of abrasive. Through 2 to 4 processes to get the appearance of the demand. According to the variety resolution of surface treatment skills, it is necessary to carry out the pre-treatment process of lighting treatment. Some surface treatments require pre-treatment of surface coarsening (such as plasma spraying, etc.) in order to add adhesion between coating and substrate. Some of them need light treatment (for example, mechanical polishing and chemical polishing can be used to achieve the purpose of light treatment before electroplating and EDM deposition).
1. Grind flat, water-cooled with 320grid sandpaper, grind for 2-3 minutes, remove the damage layer caused by cutting, and make the surface of sample flat. Use 320grid SiC sandpaper, water-cooled, 240 rpm, rotation in the same direction, pressure: 27N (6lbs) / each sample until the sample is ground smooth. Note: The removal of cutting damage layer is the basic task of grinding. If the removal is not clean, the direct consequence is that the observed phenomenon may be false.
2. For rough polishing, apply 9 μ m metal diamond polishing paste on text polishing cloth with holes in advance, use distilled water as cooling lubricant, and polish for 10-15 minutes. Rough polishing process: 9 μ m metal diamond polishing fluid + metal polishing lubricant, ultra pad polishing surface, rotating speed 120 rpm, reverse rotation, pressure: 27N (6lbs) / each sample, time 10min.
3. For final polishing, use micro color or master text polishing cloth, add master met silica suspension polishing solution, and polish for 10-15 minutes. Final polishing process: use master met silicon dioxide polishing solution on the micro-sloth polished surface, rotate at 120 RPM in a reverse direction, pressure: 27N (6lbs) / each sample, time: 10min. Note: in the polishing process, the sample needs to rotate in a fixed time direction. Most metal alloys have hard phases. If the direction is not rotated, the polished sample will have a black "long tail" on the hard phase, which affects the metallographic quality. The key to solving the problem of "long tail" is to rotate the direction of the sample. You can turn 90 or 180 degrees at a time.
Recommended products: titanium bars, titanium tubes, titanium flanges
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