The structure is tight and it is easy to maintain the geometry of the cutting disc, ensuring high grinding precision and extending the service life of the aluminum abrasive cutting disc. The structure is loose, the gap can accommodate the grinding debris, and the cutting fluid or air can be brought into the grinding zone together to reduce the grinding heat and improve the grinding efficiency, but the cutting disc wears fast and the service life is shortened.
The strength is very high for the safe use of the cutting disc with a factor of 1.5. When the cutting disc rotates, there is a large centrifugal force. If the 14 inches cutting disc without sufficient strength bursts, it will cause serious accidents. Therefore, the cutting disc speed must be much lower than the bursting speed.
1 Correct use of the tool and grinding defects
First of all, the correct use of the cutting disc can be considered according to the equipment, grinding amount, process requirements, workpiece processing accuracy requirements, surface roughness requirements, production efficiency, and production cost, followed by specification of cutting disc replacement, installation requirements, strict Two static balances, the diamond pen should be properly trimmed.
Firstly, the dressing of the cutting disc should be standardized: the diamond pen should first be fastened and fastened. The axis is generally 1~2mm lower than the center of the cutting disc and inclined downward by 5°~10° to prevent the diamond pen from penetrating into the cutting disc due to vibration. In rough repair, the amount of large back-cutter is used, and it is repeatedly trimmed several times. When finishing, the smaller the amount of cutter and the depth of the knife are used, and the reciprocating is 2 - 3 times, and the last time is trimmed from right to left. The end face should be repaired first, and then the circumferential surface should be repaired. When repairing the side of the cutting disc, such as manual trimming, the diamond pen must be firmly fixed, gently touch the side of the cutting disc, using a smaller knife depth, preferably with a fulcrum, slow, uniform speed movement, at the same time, pay attention to adequate cooling.
2 The cutting disc is not properly trimmed and is prone to defects.
The tool should be repaired in time: the workpiece material, hardness, size, length, geometry, grinding time are different, the cutting plate works for a certain time, the shape change should be repaired in time, otherwise it will cause a burn, deformation, tolerance, extrusion Inappropriate grinding and so on.
(1) The cutting disc is blunt: the grinding time is too long, the workpiece material is too hard, the cutting disc loses self-sharpness, the cutter is not sharp, and the workpiece is not properly ground, forming extrusion, sparking, the workpiece has shock marks, dimensional accuracy If the requirements are not met, the roughness is high, resulting in unqualified workpieces.
(2) The geometry of the workpiece is complicated, the cutting disc is not trimmed, and the circumferential surface is not straight, which is easy to cause the workpiece to be tapered, and the dimensions of the parts are not equal, resulting in unqualified parts or inaccurate measurement.
(3) When grinding the step shaft, the cutter cannot be moved laterally, and the multiple steps are different in length, resulting in a step on the circumferential surface of the cutting disc. The workpiece is ground with spiral marks, and the finish is not high. Good product.
(4) The workpiece with higher hardness or the workpiece with oxide scale will quickly squeeze out the abrasive disc of the cutting disc during the grinding process, destroying the self-sharpness, and quickly blocking the air hole, making the cutting disc dull and burning the workpiece. Or a multi-prism appears, the plain line is not straight, causing the workpiece to fail.
(5) When the cutting disc is grinding the step shaft, the arc angle of the shaft shoulder is not equal, and the arc angle of the shaft is getting larger and larger, which causes the rounding requirement to be unqualified, or the workpiece is not clear and does not meet the process requirements. Form a defective product.
(6) When the side is ground, the amount of feed is large, there is no heat dissipation angle, the temperature in the grinding zone is too high, and the blade edge is not sharp, causing the side of the workpiece to crack and form a grinding crack.
(7) Manually trimming the side of the cutting disc without fulcrum, uneven movement, forming intermittent trimming, forming numerous high and low points on the side of the cutting disc, and forming a mesh pattern when grinding the workpiece, especially when the grinding area is large. Increases the unevenness of the surface.
(8) When trimming the circumferential surface of the cutting disc, the diamond pen moves too fast, the blade edge is uneven, the abrasive grain is quickly detached in a short time, the cutting disc is blunt, and the surface of the workpiece is vibrated to form a multi-prism column.
(9) When trimming the circumferential surface of the cutting disc, the diamond pen moves too slowly, and the abrasive grains are flat and uniform in the unit area, but the resistance during grinding is increased, the grinding heat is too fast, and the surface of the workpiece is easily burned or cracked. It is also easy to cause the workpiece to be out of roundness.
(10) Trimming the circumferential surface of the cutting disc for stainless steel, the cutter is uneven, forming intermittent trimming, so that the workpiece is not accurate, the dial mark does not match the actual feed amount, the half wire is entered, the size is not changed, and then the half wire is inserted. Still, have not changed, and then into the half wire, it is possible to eat two knives, forming knives. Workpieces with small tolerances are prone to overshoot, and the workpiece is bent and beaten.
In the grinding process, the correct selection of the cutting disc and the correct dressing of the tool are the key to improve the machining accuracy and the level of grinding technology. The grinding process is basically the last process of the part processing, and the final geometric size determines the machining accuracy of the part. Good products must eliminate all kinds of processing defects, follow the process flow, strict processing steps, eliminate the influence of unfavorable factors, and only combine the rich experience and the excellent processing level to create the ultimate fine products.