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Why cast steel grit is slow in surface treatment of workpiece?

2020-05-19 14:57:27   Review:0 Click:
  The main parameters affecting cast steel grits are abrasive type, abrasive particle size, abrasive concentration, spraying distance, spraying angle, spraying time, compressed air pressure, etc.

  Three factors of surface result obtained by commonly used cast steel grit process parameters are: acceleration of compressed air to jet flow (adjustment of sand blasting pressure) P, type of abrasive (S), distance of spray gun (H), angle (θ).

  1. The influence of pressure adjustment on surface results

  After s, h and θ are set, the higher the p value is, the higher the velocity of the jet flow is, the higher the efficiency of cast steel grit is, and the rougher the surface of the workpiece is. On the contrary, the surface is relatively smooth.

  2. Influence of distance and angle of spray gun on surface result

  After the P and S values are set, this is the key to the manual sand blasting technology. The distance between the spray gun and the workpiece is generally 50-150 mm. The farther the spray gun is from the workpiece, the cast steel grit efficiency of the jet flow and the smoother the workpiece surface. The smaller the angle between the spray gun and the workpiece, the lower the efficiency of the jet flow and the smoother the workpiece surface.

  3. The influence of abrasive type on the surface results abrasive can be divided into two types according to the particle state: spherical and diamond. Diamond abrasive is usually used in cast steel grit. Glass beads are spherical abrasives.

  After the three values of P, h and θ are set, the surface result obtained by spherical abrasive blasting is relatively smooth, while the surface obtained by diamond abrasive is relatively rough, and the same abrasive is divided into coarse and fine. In China, the coarseness of abrasive is divided according to the number of screens, generally known as the number. The higher the number is, the smaller the particle size is The higher the cast steel grit number of the same abrasive is, the smoother the surface result will be.

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