[China Glass Net] The scratch problem is a common quality defect in glass processing. It is also a quality accident that is easy to cause in production. How to effectively solve and deal with scratch problems is still important in glass processing and production. We must effectively solve the problem of scratching. First, we must analyze the causes of scratches. The reasons for analysis and resolution should mainly focus on the quality of the original blank, process operation and equipment status.
Original sheet blank quality. The choice of the original film of automobile glass is very important. It is necessary to use the automotive-grade float glass. It is recommended to use the float original film manufacturer with good brand image and stable quality assurance. Some manufacturers can not reach the automotive grade. Who is the original film, the original film itself is scratched, the current floating film on the market has a great difference in quality, the stone on the original piece of glass, sand will also cause vibration between the glass during transportation , and the second scratch when the relative movement occurs. Therefore, when cutting the glass out of the box, we need to check the quality of the blank, first of all to ensure that the blank glass is not scratched. Process control of scratches includes all possible processes involved in production.
The cutting process , whether it is manual or fully automatic cutting machine, must ensure the cleaning of the cutting table and the cleaning of the table. The glass swarf on the table surface is more likely to cause scratches on the surface of the glass, and in actual production, it is necessary to purify the slab table after each squatting, and it is better to use a wind gun for purging. When the glass behind the bracts is dropped, the glass should be separated from each other.
The edging process , whether it is manual edging machine grinding, first of all to ensure the cleaning of the glass suction cup and the support wheel frame, the grinding glass shards will remain on the suction cup and the wheel frame, high pressure before each shift Water gun, flushing the suction cup and the wheel carrier. The ground glass is directly washed into the washing and drying machine to wash and dry the glass, and then the glass paper is dropped on the sheet by piece. If there is no conditional edger and the washing and drying machine is connected, the glass should be isolated after the edge grinding, and the rubber strip can be separated. The card is placed at the edge of the glass, and then the frame is dropped. When the glass is placed up and down, it is strictly forbidden to lay up the laminate. In short, always keep two pieces of glass without relative friction.
With the diversification of glass design, whether it is architectural glass or automotive glass, there are more and more holes, grooves and openings in the glass. Due to its positioning accuracy, waterjet cutting has high precision and random cutting of glass. Large, high cutting quality, high production efficiency, glass processing manufacturers have more and more applications of waterjets, and have been widely used in the glass processing industry, but unreasonable operation process for drilling, trenching and Opening the hole will also cause scratches on the surface of the glass. The sand used in the waterjet is a major hidden danger of scratching the glass. Before the waterjet on the glass, a plastic film is applied to the lower surface of the glass, and the waterjet grid is used with a water pipe. The table top is cleaned to ensure that there is no sand on the grid edge. After the glass is placed on the table, the glass can not be pulled and moved in the water knife. After the glass water knife is cut, the glass is erected and then the water pipe is used. The two sides of the glass are washed, the sand on the glass is washed away, and then placed on the shelf. After each piece of glass is finished, the grid table is flushed, and then a piece of glass is placed.
If the cooling water of the linear edging machine cannot be kept clean, the ground swarf remains on the pressure transmitting plate through the water spray pipe. When the lower piece of glass is transported in, the glass swarf is pressed by the pressure transmitting plate and the glass is contacted, because the pressure transmitting plate is elastic, so that the relative sliding of the two is caused, thus causing the long point of the tempered glass. Scratched.
Glass washing and drying machine maintenance. After using the washing machine for a period of time, the washing water will be rich in glass swarf. This kind of glass slag remains on the surface of the glass and the transfer roller with the washing water, which causes a long-point scratch similar to that of the linear edging machine. Therefore, the machine should discharge the sewage in the water tank after the end of each day. Then use clean water to clean; in addition, if the brush is mixed with glass swarf, it will cause scratch on the surface of the glass. Regularly clean the brush with a high-pressure water gun. It should also be noted that after long-term use of the washing and drying machine, the diameter of the conveying rubber roller will be worn and thinned to a certain extent, and the lower surface of the glass will contact the steel plate in the lower part of the equipment, so that when the glass is transported, Will cause scratches on the lower surface.
Tempering process. If the scratch of the glass is caused by the tempering process, we should analyze it from the following aspects. First, we must check the driving roller of the tempering furnace to confirm whether there is any foreign matter stuck on the ceramic roller. Check one by one to see if there are any abnormalities in the individual roller drive, there is slipping phenomenon, or a certain roller does not pass the phenomenon; observe whether the glass and the furnace door are in contact when the glass enters the furnace, if the light perception of the furnace door is broken If the length of the glass is calculated, an error will occur. When the glass enters the furnace, it will hit the door of the furnace, causing all the horizontal scratches on the surface of the glass. Check whether the glass slag is stuck at the upper and lower sash of the cooling section. There is glass slag stuck in the grid, which can easily cause scratches on the glass surface.
The order of the station is changed. The order of the station is better. The whole glass is transferred, and the whole frame is moved by the crane or the forklift. The movable glass frame can also be used to minimize the number of glass movements. When using a hand-operated glass movable glass frame, it is better to be limited to the flat ground condition inside the workshop to reduce the vibration between the glass when pulling the glass frame. If you want to move the glass, be careful to let the glass bottom While touching the supporting beam at the bottom of the glass frame, keep the bottom edge of the glass at a certain distance from the glass placed in front, and then push the glass close to the glass placed in front, and push it as far as possible. Then slide, so that the bottom edge of the glass simultaneously touches the glass placed in front, and can not be pushed, so that the glass is pushed at a certain angle, which makes it easy to cause slender scratches on the glass. In addition, in the process of re-sequence, it is necessary to increase the intensity of mutual inspection between processes, find scratches, timely treatment, check one by one, find the root cause, and timely treat the glass that has been scratched, and polish the lightly scratched glass. Slice theory.
To solve the problem of scratching in glass processing, we must check every step of the production process, formulate correct and reasonable process operation system, strengthen management, improve the quality awareness of each employee, and make every employee develop well. Process operation habits. In addition, the whole process of production should be carried out by self-inspection, mutual inspection, and special inspection and three inspections. Only in this way can the glass scratches in the production process be reduced to a large extent.
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