Question One: What is polished? To improve the surface quality of parts mean?

Answer: With a sticky abrasive polishing is to take special process methods and made special polishing wheel, rotating at the speed grinder, the workpiece and polishing wheel next to the friction, so the sharp edges and corners of this round of the abrasive to the system grinding the surface flat and smooth process method.

Polished surface of the workpiece can burrs, scratches, corrosion traces, solder tumor, welding slag, sand holes, bubbles, oxide film, char, rather than physical and not be dissolved by the alkaline solution to remove other impurities, but also to a variety of Macro defects can be improved.

Polishing process can be shiny for the next road, lay the foundation for polishing process is to obtain mirror-like surface quality can not be omitted before the procedure.

In addition to polishing technology can solve all kinds of workpiece surface defects, but also help to avoid the residue left behind process steps acids, bases the harm.

Polishing process method restricted by the morphology of the surface has still mainly manual. Polished by the professional quality of teachers in their craft polished to guarantee.

Second problem: to finish the whole process several steps carried out?

Answer: usually coarse polishing, grinding and grinding in the three processes. Each transfer requires the use of a process are finer abrasives, polishing wheels, and appropriate to reduce the rotation speed, to obtain more precise than the previous Road polished effect.

Polished concrete steps depends on the surface roughness of the workpiece itself may be. Aluminum materials in addition to being severely scratched prints, the general machining parts are available l60 # shiny, and then polished, if necessary, before this can be increased by 120 # rough grinding, and then the shiny, polished. Inappropriate, not to promote one-off abrasive ground with fine sand, or both work and reduced efficiency, but also affect the service life of grinding wheels.

In order to improve polishing quality, coarse grinding must be left to the rough machining process when the mill road mark to make, in the coarse grinding Shiyou must be prints left over from grinding to do, so that the workpiece surface finish and improved step by step increased costs or labor charges not only material, the quality can not be guaranteed.

Road marks in order to avoid duplication of polished and polished to improve the quality and efficiency of grinding, polishing of each wheel in the direction are to be worn with a cross-road.

Question three: on the polished surface of the workpiece before the state requirements?

Answer: polished before the greasy parts, you must first degreasing by organic solvent, if necessary, after alkaline etching treatment should be to improve, polishing quality, or both will pollute the polishing wheel, polishing wheels, and possibly pollution workpiece surface, particularly in parts of the hole, crevice, there may squeeze in more dirt. Although the post still needs oil, but will be boosted roughness. To do this, whether it is polished, polishing or other mechanical finishing first, before processing want degreasing by organic solvents, degreasing or alkaline corrosion.

Question four: how to prevent the polished surface of a wave-shaped?

Answer: When the parts are recessed surface defects in the local area, do not go with the polished side of grinding wheel, although this method is more easily rubbed off to this defect, it will collapse in this part of the formation of concave corrugated . In the grinding parts that are defective, the first recessed surface to rub off around

Full mill then again, although this has increased the workload, but was able to significantly improve the quality of polishing, there will never be the phenomenon of wave-shaped concave collapse occurred.

Five questions: how to choose different metal materials, polishing wheel speed?

Answer: According to the status of the workpiece shape, the choice of different width and size of the polishing wheel, wheel speed should be controlled in a certain range. Too high, the wheel damage fast, life is also short; too low, productivity is low, so the wheel circumference speed must be appropriate. Metal casting, steel, nickel, polished chrome circular speed of the best when 18 ~ 30m / s, polished copper and its alloys, silver, zinc is the best peripheral speed 14 ~ 18m / s, aluminum and its alloys , lead, tin and plastic polish on the best peripheral speed should be 10 ~ 14m / s.

Issue six: abrasive polishing wheel soon off on their own using what are the reasons?

Answer: abrasive off from the glue on the following 5 main reasons:

(1) The glue is not enough when the force on the rolling abrasives. Not enough pressure, the abrasive contact with the glue area is small, abrasive glue stick to the surface only, only the bottom of abrasive contact with glue, no glue is connected around the abrasive. Abrasive polishing process, after the force will be "uprooted."

(2) after rolling has not been fully cured abrasive. When the glue has not been fully polished cured abrasive equivalent legislation in the clay, once the abrasive force of natural shedding.

(3) polished round without a warm-up before the glue in the coating, or warm enough. Blank pieces of glue coating to the wheel, because the polishing wheel, without preheating, or warm enough, the glue painted to cool quickly, affecting the adhesive strength of abrasive.

Could also be painted after the glue roll is not timely abrasive; be rolling abrasive, the glue has cooled. Above is particularly prevalent in the winter.

(4) After the baking temperature is too high abrasive bonding. Baking temperature is too high, bone glue, bone glue brittle increase, this time by the abrasive force is itself slightly from the glue.

(5) the consistency of glue is not prepared under the requirements of abrasive particle size. Mainly prepared too thin, then a layer of abrasive is shallow plastic glued on top of a very small contact area with the glue, this will certainly affect the adhesive strength of abrasive.

Seven questions: when parts of the edge of the area prone to wear polish, how to prevent it?

Answer: Wheel walking to the parts polished edge, because of the small size, and thus parts of the pressure is relatively high, the relative increase of grinding force, so the site was easier to wear. Mitigation approach is to walk to the area when the wheel polish around, the master of the polished skills to use to avoid the increased pressure caused by increased arm strength, should be appropriate to reduce the workpiece and the contact pressure between the polishing wheel, if necessary screw holes can be blocked or other measures designed to protect nursing-screen.