Material selection orientation and misunderstandings of abrasive brush filament_FAQ
by:MX machinery 2022-01-26
At present, some users make a single change in order to make up for the lack of a certain function of the abrasive brush, such as thickening the wire diameter, changing to a thicker abrasive, and increasing the length of the brush wire. Although the problem is solved on the surface, it brings More new problems, such as: 1. Thicker wire diameter (1) The user's intention is obvious, thicker wire diameter is to increase the hardness and enhance cutting force. However, for a real high-quality abrasive wire, hardness and flexibility can achieve a perfect balance: the appropriate hardness makes the product have good rigidity, and the workpiece is well contacted and abraded; the appropriate flexibility makes the brush have good resilience , Which not only guarantees the machining accuracy of the workpiece surface, but also reduces the wear and internal stress in the brush grinding operation, thereby increasing the service life of the brush without breaking the wire. (2) Tests have shown that when all the conditions are the same but the wire diameter is different, the abrasion of 14mil is twice that of 12mil brush. The main problems caused by the thicker wire diameter are: the density of the brush wire is reduced, the fatigue resistance is reduced, the wear is faster, the service life is shorter, the grinding stress is increased, and the wire is more easily broken. (3) What is correct is that the wire diameter should be as thin as possible under the premise that the hardness of the brush can meet the process requirements. 2. Users who lengthen the length of the bristles feel that the bristles of the scrapped brushes are shortened, and the longer the bristles will have better flexibility and better durability. This made a major mistake! The bristles are lengthened, and the bristles are not working on the cut surface, but on the side of the bristles. What's more terrible is that the swing range (angle) of each wire is greatly increased (see Figure 1). At 800-2500 rpm, The internal stress and fatigue coefficient of the brush filament base increase exponentially, causing the abrasive brush filaments to be easily broken and the filaments to be deformed. Note: When the length of the brush wire is 8CM, the swing range of the brush wire is about 25 degrees, and the length of the brush wire is about 1CM, and the angle is increased by about 10 degrees. The internal stress and fatigue coefficient of the brush wire foundation will double. 3. The user’s intention to switch to coarser abrasive grains is to increase the cutting force. It can be understood that if the particle size changes little, it can be almost ignored, and there may be a small amount of side effect, because the abrasive will affect the brush filaments when the brush is swinging. A shear is generated by itself, and the larger the angle of the brush wire swing, the more obvious it is. For example: Comparing the test of #120 with #180, after repeated folding in half for 30 times, the #120 abrasive wire can see obvious cracks under the microscope, but #180 did not find it. Although this double-folding experiment has increased the difference, the reason is the same. The coarser abrasive grains cut the brush filaments more severely during the running of the brush. Abrasive wire is a special product, users must determine reasonable parameters according to their needs to achieve the best use effect.
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