Selection of diamond grinding wheels and answers to common questions

2019-08-13 1375

1、 Diamond grinding wheels sintered with metal alloys are commonly known as diamond wheels: the diamond containing part of the diamond wheel is called the working layer, and the working layer is mostly circular, so it is also called the working ring. The height of the working ring is called the working height, and the width of the working ring is called the ring width. The outer part of the ring width located on the outer diameter of the grinding wheel is called the outer ring, and the inner part is called the inner ring; The diameter of diamond particles is commonly known as particle size or mesh size. The circular edge of the work ring can touch the glass twice. The work ring that is touched first is the front ring, and the part of the work ring that is touched later is called the back ring. The width of the glass after cutting and grinding is commonly known as the machining allowance.

2、 Selection Techniques and Debugging of Grinding Wheels

1. Replace the grinding wheel with the original factory standard, such as 150 diameter grinding wheels that cannot be exchanged with 175 diameter grinding wheels.

2. Select high-performance grinding wheels, with functions 1, 2, and 3 being common, and there may be bottleneck effects when adjusting the concave and convex grades.

3. The particle size connection of the grinding wheel is reasonable, and in principle, it should ensure overall efficiency. The next level should be able to correct the edge chipping and grinding marks of the previous level, continuously approaching the brightness.

4. When allocating, one should not rely solely on the experience of ammeter swing or noise, but should frequently exit the glass to check for wear marks. The margin ratio for numbers 1, 2, and 3 should be close to 7.5:2:0.52. The grinding amount should be controlled within 1mm.

5. The grinding wheel should use the front and rear ring operation method as much as possible (i.e. the swing angle of the grinding wheel), with the processing volume of the front and rear rings approaching 8:2. The grinding volume of the rear ring should not be too large, and the grinding marks of the front ring should be evenly and finely covered. The direction of the front and rear rings of the grinding wheel is opposite, and the end face shape of the grinding wheel should maintain the factory shape and viewpoint when consumed.

3、 Common questions and answers during the use of grinding wheels

Problem 1: After being ground by both machines, the glass still has defects such as edge chipping, corner dropping, and grinding wheel marks.

Answer: The selection of grinding wheel particle size is not appropriate or the function is poor. The particle size should meet the requirements of the thickness, scale, and processing speed of the processed glass. For example, if the No. 1 and No. 2 grinding wheels are equipped with 80 mesh 140 mesh grinding wheels, grinding 8mm to 25mm glass is good, but grinding 5-6mm glass may cause edge breakage. Generally, a 100 mesh 140 mesh grinding wheel should be selected to meet the requirements of 4-19mm glass. Excessive allocation of grinding amount to other grinding wheels can lead to small chipping edges. The second grinding wheel should be able to simultaneously correct the chipping edges and completely cover up the first grinding mark. Often, the second grinding wheel is ignored and the selected function is poor. Although it appears to be a problem with the first grinding wheel, it is actually necessary to replace the high function second grinding wheel and re adjust the reasonable allocation of machining allowance.

Problem 2: The view point of the grinding wheel operation end face is more outward inclined than the factory view point, significantly increasing the inclination of the outer low and inner high, and even presenting a stepped shape on the inner and outer sides.

Answer: The front and rear view points are not suitable or the motor is loose, the amount of work on the outer side of the front ring is too large, and the rear ring is not working. It is necessary to adjust the motor view points in a timely manner and fix them.

Problem 3: The grinding wheel's end face is close to the horizontal, and even the outer side is high and the inner side is low. Ultimately, the remaining 1/3 of the grinding wheel cannot be used.

Answer: The front and rear view points are not suitable or the motor is loose, the front outer side is not working, and the inner side of the rear ring has a large amount of work. The motor view points should be adjusted and fixed in a timely manner, and the machining allowance for the front and rear rings should be reasonably allocated.

Problem 4: There are impact marks on the outer side of the grinding wheel, or there are phenomena such as circular dents on the end face and shiny alloys, which cannot be continuously used.

Answer: This phenomenon often occurs in chamfered wheels or grinding wheels with finer diamonds, such as No. 2 and No. 3. The reason is that when replacing a new grinding wheel or processing thick and thin glass with a large span, the forward and backward positions of the grinding wheel are not adjusted in a timely manner, resulting in the glass directly hitting the outer side of the grinding wheel, or the allocated processing amount greatly exceeds the capacity of the grinding wheel, which is caused by the failure to stop and correct in a timely manner. It is important to pay attention to the backward grinding wheel and gradually follow up on the grinding amount.

Problem 5: If there are still about 2mm deep teeth in the entire gear, it will collapse, commonly known as inability to grind and cannot be continuously used.

Answer: The depth of the water inlet groove of the full gear is 1.5mm higher than the height of the working layer on the inner side of the grinding wheel's working ring. The remaining 1.5mm of the water outlet indicates that the working layer has been used up. To avoid using up the remaining one-third of the grinding wheel, due to large machining allowance or the impact of the glass on the outer substrate of the grinding wheel when grinding thick glass, there is a 3mm high corner guard on the outer side of the working side, so it appears that 4mm cannot be used up on the outer side, but the actual working layer has been completely used up.

The article originates from diamond grinding