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Abrasive quality control

First, the quality of abrasives

1) There are large particles in the abrasive. Causes scratches.

2) Different manufacturers, the same specifications of abrasive products, the difference in particle size specifications is too large, and some even cross the grain size number. Lead to unstable product performance.

3) Abrasives of the same grade, the actual strength of the sharp and durable cutting wheel varies greatly, resulting in unstable product performance

4) The impurity content and content in the abrasive are unstable. This results in unstable product performance; it also affects the performance of the workpiece being ground for more demanding grinding objects.

The quality problems that often occur at present are mainly reflected in the above four aspects. The following four aspects are introduced on how to conduct quality control.

Second, abrasive quality control

1) Abrasive large particle control. thin flat cutting disc For single crystal diamond abrasives, the size fractionation is usually carried out by a sieve sieving method. Since the standard is unreasonable for large particles, large particles often appear in the single crystal abrasive. Especially for 80/100 abrasives for fine grinding applications, large particle inspections must be carried out before use. If the manufacturer wants to control large particles, it is necessary to reduce the upper limit sieve of the inspection sieve by one number, so that the large particles can be effectively controlled.

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The user has to control large particles, and can filter out large particles by sieving. Microscopic image method can also be used to inspect large particles. It is found that large particles should be treated or replaced. Diamond micronized abrasives are usually classified by sedimentation method. Since there are no practical standards at present, the definition and understanding of large particles are currently inconsistent. Therefore, it is not surprising that large particles often appear in micronized products.

In order to control large particles, the production unit must first control the settlement time of the stopper particle size to ensure that the large particles are blocked outside, and at the same time pay attention to the production links without any pollution. Especially in the production of fine powder of 5μm, the production environment must be clean. As a user, it is currently necessary to examine large particles in micropowder using only microscopic image analysis. For the definition and analysis of large particles, please refer to the contents of the fifth lecture.

2) For single crystal diamond abrasives, the products of the same specification, different manufacturers and different batches have great differences, and some even differ by one grain size. This will have a greater impact on the use of the effect. The manufacturer shall strictly inspect the screen used to ensure that the screen meets the standard requirements in order to ensure that the particle size of the single crystal diamond abrasive product of the same specification of different batches and different manufacturers is stable.

For the user, it is also necessary to use a qualified screen for quality inspection. For the user, the one-to-one particle size composition is an important factor to ensure the stability of the use effect. Therefore, the particle size composition of the product should be strictly checked. The method by which the user controls the particle size composition is a screening method and an image analysis method. For the diamond micropowder, a microscopic image method, an electric resistance method, or a laser diffraction method can also be used.

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