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Sandblasting machine: "effect of process parameters on workpiece sandblasting"?

Author: admin Source: This station Time: 14:26, June 14, 2020
     Sand blasting machine Measurement of coverage: apply a layer of colored glaze or fluorescent glaze on the surface of the workpiece, and then sandblast the workpiece according to the process parameters. After sandblasting the workpiece surface once, take out the workpiece and observe the proportion of residual coating on the surface under the microscope (magnifying glass). If the residual coating is 20%, the sand spraying coverage rate is 80%. If the residue is only 2%, that is, the coverage rate is 98%, it can be regarded as completely removed, that is, the coverage rate is 100%, and there is a required time. If the coverage reaches 400%, it will be four times of the required time.

The factors that affect the coverage rate include the hardness of part data, sandblasting diameter, eruption point and interval, sandblasting time, etc. When the hardness of the parts is lower than or equal to the hardness of the standard test piece, the coverage rate can reach 100%; otherwise, the coverage rate will decrease. Under the same sandblasting flow rate, the longer the distance between the nozzle and the workpiece, the smaller the eruption point and the smaller the sandblasting diameter, the shorter the time to reach the coverage requirement. In the process of sand blasting strengthening, the proper size of sand blasting and eruption point and interval should be selected to make the sand blasting strength and coverage reach the required value together.

     Sand blasting machine The process parameters of strength mainly include: sandblasting diameter, sandblasting flow rate, sandblasting time, etc. The larger the sandblasting diameter is, the faster the speed is, the greater the collision momentum between sandblasting and workpiece is, and the greater the sandblasting strength is. The residual compressive stress caused by sand blasting can reach 60% of the tensile strength of the parts. The depth of the residual k stress layer is generally 0.25 mm, and the maximum limit value is imm. The sand blasting strength needs a certain sandblasting time to ensure. Through a certain time, after the sandblasting strength reaches full, the sandblasting time is extended, and the strength will not increase significantly. In Almen experiment, the sandblasting strength is characterized by the increase of specimen deformation.

     Sand blasting machine In the Almen experiment, the sandblasting strength is measured by the test piece (used for non-ferrous metal experiment), test piece a (most commonly used) and test piece C (higher strength). The relationship between test piece a and test piece C is approximately three times. If the strength measured by c test piece is 0.15 ~ 0.20tmn, it is equivalent to 0.45 ~ 0.60mm of test piece a. In the process of the experiment, the original deformation of the specimen was measured, and then the fixture which clamped the specimen was placed in the sandblasting box, and the same process as the workpiece was used for eruption. After sandblasting, take down the test piece and measure the deformation arch height.
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