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First, the problems in use (a) The problems in the use of the new round (disk) are:
1, grinding slower, not as sharp as diamond abrasive, slightly inferior to green silicon carbide.
2. The wear grooves are easy to appear on the grinding tools. 3, prone to grinding surface overheating, some green beads turn red, and even the phenomenon of cracking.
(b) Analysis of the problem
1. Abrasives that are relatively slow and hard to grind, and it is a reality that the new wheels (disks) are slow to grind. The hard abrasive grinding tool is used to grind the marble beads, which is forcible. It depends on the hardness difference between the grinding material and the material being grinded. It is enforced under certain mechanical pressure and rotation speed, of course, it is fast; Of course, it is determined that China's diamond products are broken, scratched and hard to keep up with the price. While the new wheels (discs) are also machined under certain mechanical pressures, their texture is not super hard or hard abrasives, but instead they rely on alpha quartz within them for nearly the same hardness. This kind of grinding, since it is nearly the same hard (alpha quartz, Mohs hardness is 7, crystal, glass Mohs hardness of 6.5), will have a common damage, is to achieve the protection of the workpiece with this common damage, which is Grinding. Is the reason for slowness. The use of grinding in the processing of rhinestones is a mature method developed by the crystal processing industry many years ago. The typical rhinestone size is small in φ2 and not larger than φ8. 17 or more surfaces are ground on such small crystal beads. The amount of grinding on each surface is very small, and the requirements are very smooth and the interface is clear and complete. Grinding can guarantee. If grinding is used, although the processing speed can be improved, the chipping and scratching of the diamond cannot be avoided, leaving a lot of difficulties for subsequent polishing. Moreover, the frog is a frog that is neither economical nor environmentally friendly. The slow processing speed of the new type of wheel (disc) is related to the grinding ability of superhard and other hard abrasive tools such as emery. The use of super-hard and hard abrasive diamonds is an industry-first habit in other crystal processing. It is naturally compared with it. In fact, the initial grinding of a rhinestone should be ground according to its objective requirements. Gentle grinding.
2. The working principle of the new wheel (plate) and the corundum plating wheel (plate) on the grindstone is completely different. Under the same processing pressure applied to the rhinestone bead, the corundum applies a cut to the workpiece, which is based on the disparity of multiple hardness levels higher than that of the crystal, and how much the feed is cut off, so long as the feed is reasonable, the wheel is not considered. ) The loss, without regard to the movement of the mechanism, is carried on to the armor, and the grinding is completed. The groove (disk) does not appear; the user is accustomed to use. The new round (disc) is applied to research. Research is the loss of each other. The principle is to rub against the rhinestone bead, and the friction surfaces are mutually depleted. The surface of the new wheel (disc) is continuously damaged by the abrasive particles, and new abrasive particles are continuously exposed. This is the fundamental principle that it can both grind the workpiece and protect the workpiece. This principle is the best for meeting the initial grinding requirements of the rhinestones and is an alternative to any other grinding. It is also this principle has not been fully understood and used by the machine designer, so that the mechanical mechanism of the machine can not match the action of grinding, therefore, the simple replacement of the new wheel (disc) on the original machine will surely grind quickly groove. Only by designing the action mechanism of the mill according to this principle, the groove on the grinding tool is not substantially generated, or is slightly easy to repair.
3, the phenomenon of overheating and cracking of the bead mainly occurs on the domestic small roller mill. At the beginning of the grinding, the whole row of armored beads will gradually turn red, and some of the stones will crack due to overheating. Regardless of whether the air pressure was reduced or the pulley was exchanged, there was no improvement. The emergence of these problems is not caused by the new wheel (disc) itself, but by the action and pressure generated by the water supply and feed mechanism of the current machine. That is, the mechanism of the machine does not adapt to the requirements of grinding. The new wheel (disc) cannot perform normal grinding of the rhinestones by the machine that produces this grinding action. This is not a match.
Second, the solution to the problem The new wheel (disc) solution to the problem, in the final analysis is how to solve the problem of adaptability of existing grinding old machines.
At present, the main equipment for China's diamond processing industry is equipment produced by self-produced equipment or other crystal processing machinery enterprises. The grinding machine design starts with the grinding of the crystals and imitates one by one and translates into the design of the machine mechanism. These machines are feasible for large spherical crystals and even φ20 spherical surfaces. However, if the abrasive grinding tools are suddenly replaced on these machines, the machine is difficult to match. In particular, in the case of roller mills, there is a general problem of ignoring the loss of abrasives, no tracking compensation and self-repairing devices, and in terms of mechanism motion, there is no consideration of the requirements for grinding the workpiece, and the corresponding action of grinding is lacking. Therefore, directional feed and fixed-point application Grinding, grindstone grooves appear; in the water supply, or in the crystal grinding design mode, the water supply is not rigorous, and it is difficult for the workpiece to be polished directly. Most companies that use this kind of machine for grinding trials are returning halfway and cannot benefit from the use of new rounds (disks).
Solution: It is necessary to begin with two different process principles, grinding and grinding, to improve the design. First of all, we must fully consider the common loss of grinding tools and parts to be worn, to design the mechanical action of the machine (grinding can ignore the wear of the grinding tools to design the mechanical action of the machine). Secondly, the grinding process is longer than grinding and it is prone to temperature rise, which in turn places higher demands on the machine's water supply. That is to improve the water supply.
Third, increase the feed automatic compensation device.
Fourth, design the same machine trimming device.
In short, the emergence of new types of rhinestone grinding wheels and grinding discs has provided new guarantees for upgrading the quality of Chinese rhinestones. The problems that arise during use are mainly due to machine mismatch and people's use of custom diamond grinding references. Not a problem with the new round (disk) itself. We have already been pleased to see that some large diamond manufacturers have already seen through the Lushan Mountain and completed the technological transformation. They have achieved flexible feeding, oscillating and grinding, and are very familiar with their work. For example, the quality of production and the benefits have become the technological progress of their domestic counterparts. Improve efficiency to make a demonstration. We have reason to believe that with the rapid development of these companies, the current deep-seated situation facing the new rounds (disks) will be broken; and when the new round (disk) gets married, the Chinese diamond companies will be ready for international brand-name rhinestone preparations. It's finished.
The problems and countermeasures of using new type of rhinestone grinding wheels and grinding discs in use
The appearance of a new type of rhinestone grinding wheels and grinding discs (hereinafter referred to as new types of wheels (discs)) has started the revolution of the first grinding of diamonds; it has created a new era of Chinese rhinestone grinding; the eyes of people in the industry are bright and exciting. Since May of 2005, the use of new wheels (discs) has been used from a single manufacturer to multiple models and multiple specifications of various manufacturers, and it has been used throughout provinces and cities such as Zhejiang, Guangdong, and Shanghai. The field of application also ranges from the initial grinding of large and small diamonds to the processing of small crystal balls, small pendants and other small accessories, and has evoked the strong demand of glass deep-processing companies for ordering special-shaped discs and special-shaped drums. Industry veterans believe that the new wheel (disc) series of abrasives, to meet the requirements of small crystal jewelry processing, is the ideal type to replace the silicon carbide, silicon carbide. Its guarantee for product quality, economical use, and environmental protection, and the possibility of increasing production capacity for large armor production are all unmatched by the original methods. However, over a period of time, with the increase in the number of companies used, the problems have been exposed. This article will discuss the issues and countermeasures in the use of new types of wheels (discs).