To effectively solve the problem of scratching, first of all, we must analyze the causes of scratches, the reasons for analysis and resolution should mainly focus on the original blank quality, process operation, equipment status.
Original film quality: The original film selection is very important. It is recommended to use the original float manufacturer with good brand image and stable quality assurance. At present, there are great differences in the quality of the float original film on the market. The stones and sand on the original glass will also cause vibration between the glass during transportation, and cause secondary scratches during relative motion. 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.
Cutting/punching process: Whether it is manual or fully automatic cutting machine, it is necessary to ensure the cleaning of the cutting table and the cleaning of the table. The glass shards on the countertop are easily scratched on the surface of the glass and directly lead to waste. In actual production, it is necessary to purge the slab table once every time, so that it can be purged with a wind gun. When the glass behind the bracts is dropped, the glass should be separated from each other.
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. The waterjet cutting is accurate due to its positioning, and the cutting precision of the glass is high. Large, high-quality cutting, 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 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 countertop is flushed with a water pipe. Clean, ensure that there is no sand on the grid edge, and then place the glass on the table, the glass can not be pulled and moved in the water knife. After the glass water knife is cut, first erect the glass, then use the water pipe to the glass. The two sides are washed, the sand on the glass is washed clean, and then placed on the shelf. After each piece of glass is finished, the grid table is washed with water, and then a piece of glass is placed.
Grinding 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, and high pressure should be used 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, the artificial laminate is strictly prohibited. In short, always keep two pieces of glass without relative friction.
In addition, if the cooling water of the linear edging machine cannot be kept clean, the ground shards will be left 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 the ceramic roller is stuck with foreign matter. 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 faulty 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 dampers of the cooling section. There is glass slag stuck in the grid, which can easily cause scratches on the glass surface.
Station order: The whole sequence of glass is transferred in order, and the whole frame is moved by crane or forklift. The movable glass frame can also be used to minimize the number of glass movements. When using the hand-operated glass movable glass frame, it is 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 bottom edge of the glass touch first. The supporting beam at the bottom of the glass frame should be placed at a certain distance from the glass placed in front of the glass, and then the glass should be pushed close to the glass placed in front, and pushed as much as possible, then slide So that the bottom edge of the glass can simultaneously contact the glass placed in front, and can not be pushed, so that the glass is pushed at a certain angle, which is 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, timely treat the glass that has been scratched, and polish the lightly scratched glass. Slice theory.
To solve the problem of scratches in glass processing, we must check every step of the production process, formulate a 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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