1, first of all, rough throwing. Rough polishing is to throw away the file marks, clamp marks, drill marks, burrs and the black oxide layer left by welding on the surface of the jewelry metal bracket, so as to make the jewelry metal bracket smooth, harmonious, smooth and smooth as far as possible, and make the lines smooth. However, don't push too hard and don't polish too hard. If you leave a depression on the surface of the jewelry support, it will be difficult to restore the original appearance. Rough throwing is the basis of middle throwing and fine throwing. If it fails to meet the requirements, it will affect the later polishing and directly affect the quality of jewelry.
2. Immediately start the polishing motor, and rotate the upper polishing brush (brush) by the rotating force of the motor shaft. After the brush is tightened, apply a coarse polishing agent-green wax block (oxide containing chromium) on the brush for polishing.
3. The brush mainly polishes the gaps such as the table top, the main and auxiliary stone edges, the ornamental design, the outer side of the ring, and also polishes the reverse side of the jewelry. In the process of operation, the first thing to pay attention to is to wax evenly on the brush, and the polishing intensity should be appropriate. Will not cause jewelry deformation, claw falling, claw loosening or even stone falling due to excessive force, and will not leave file marks, scratches and so on if it is not polished properly. All jewelry should be roughly polished, and the places where polishing is not obvious should be polished repeatedly.
4. If the inlaid ring is polished, the inner ring of the ring should be polished with a velvet mandrel, and the appropriate velvet mandrel should be selected as needed. Before polishing, the velvet core of the ring must be coated with green polishing wax. Pay attention to the contact surface between the spindle and the ring when throwing, that is, the ring should not be inserted too deep into the spindle, and the polishing contact surface should be 1/3 inner ring arc. If the polished contact surface is too small, the working efficiency will be low; If the contact surface is too large, it is not convenient to change the polishing position. Moreover, due to the high friction resistance, it is difficult to hold the jewelry to be polished, and it is easy to cause the polished jewelry to fly out and damage the gem ring surface or the shape of the jewelry.
5. Pay attention to waxing the brush and cloth wheel during rough polishing, but don't daub too much wax at a time, so as to avoid the polishing wax melting and covering the jewelry surface after rubbing, covering all kinds of traces and pits on the jewelry surface, affecting the quality of rough polishing of jewelry, bringing difficulties to fine polishing, and even leading to rough polishing again.
6. The polishing technology of the polishing operator will also affect the polishing quality. If the polishing operation is not correct, it is impossible to throw out good jewelry. Generally speaking, when polishing, try to make the jewelry parallel to the polishing cloth wheel, hold the jewelry with both hands and follow the moving direction of the cloth wheel from top to bottom. Polishing must polish all the jewelry evenly at once, and put every part in place. The polishing process is incorrect, and the polished jewelry is easy to bounce off the polishing wheel at high speed, which can easily cause damage to the surface of gem ring and deformation and fracture of the metal bracket. If the polished jewelry is small (such as chest pendant and earrings), you can prepare a hook made of metal wire and keep the jewelry polished with your left hand. When polishing, jump polishing and uneven stress should be prevented. If there is jumping phenomenon, it may be that the polishing wheel is not on the shaft, or the polishing cloth wheel is not round, which is more likely to be a gesture problem. Find out the reason and solve the problem.
7. For some alloy jewelry that is difficult to polish, it is difficult to polish the metal surface because the toughness of the metal making jewelry is stuck when polishing with soft metal, so it can only be achieved by polishing for many times. For example, platinum jewelry should be polished in the middle as much as possible, and the method of polishing in the middle is basically the same as that of rough polishing. Brush and yellow cloth wheel are still used for intermediate polishing, but the intermediate polishing is just different from polishing wax, mainly using white polishing wax (alumina) with fine particles. Polishing is to operate according to the rough polishing method, and polish the jewelry from beginning to end.
8. After rough polishing, any jewelry must be polished, so as to make the surface finish of metal jewelry stronger. Fine polishing is a further fine polishing on the basis of rough polishing and middle polishing, which makes the surface of jewelry smoother and smoother and achieves the effect of mirror reflection. However, the polishing friction contact surface is small, and the polishing force is not only small but also uniform. The surface of jewelry must be completely polished. The specific method is to polish the front of the jewelry with a fine white cloth wheel, and then polish the sides and corners of the jewelry. If the ring is polished, polish it with red wax on the velvet mandrel of the ring. Then, polish the shoulder on the front of the ring, and finally polish the two sides and the outer ring of the jewelry.
9. Jewelry is polished three times, including rough polishing, medium polishing and fine polishing. It should be said that the surface of jewelry is as smooth as a mirror. However, sometimes due to rough grinding, there are still large file marks, scratches and other traces on the surface of jewelry. It is difficult to clean it through the polishing process. In addition, in the polishing process, polishing the pits covered under the surface of jewelry not only affects the smoothness of jewelry, but also affects the quality of jewelry. If anything happens, be sure to trim it. The trace control file marks on jewelry should be re-polished with hanging mill and sandpaper, and then polished. If there are pits on the surface of jewelry, it must be repaired and polished before polishing.