To adjust the sand blasting pressure according to the actual situation to improve the efficiency of sand blasting, the following steps can be considered:

First, understand the characteristics of the workpiece

1. Analyze the material of the workpiece: Different materials have different hardness and strength, for example, softer materials such as aluminum may require lower sandblasting pressure, while harder materials such as steel may require higher pressure.

For aluminum alloy workpieces with low hardness, too high sandblasting pressure may lead to excessive surface wear and deformation.

2. Consider the size and shape of the workpiece: Large workpieces or workpieces with complex shapes may require higher pressure to ensure that the sandblasting can cover all areas.

- Complex shaped castings may require higher pressure in depressions and corners to achieve good sandblasting results.

Second, evaluate the sandblasting material

1. Determine the hardness and particle size of the sandblasting material: harder and larger particle size sandblasting materials usually require higher pressure to push and produce an effective impact force.

- When using coarse sand for sandblasting, the corresponding increase in pressure is required to obtain sufficient cutting force.

2. Consider the flow rate of the sandblasting material: If the flow rate of the sandblasting material is large, it may be necessary to increase the pressure to maintain an adequate sandblasting speed.

Test and experiment

1. Start from a lower pressure and gradually increase: test with a smaller pressure increment to observe the change in sandblasting effect and efficiency.

- Check the cleanliness, roughness and processing speed of the workpiece surface after each increase in pressure.

2. Record the results under different pressures: including sandblasting time, surface quality, material consumption and other data for comparison and analysis.

4. Observe the surface effect

1. Check surface cleanliness: Ensure that dirt, oxidation or coating can be effectively removed at the selected pressure.

- If there are still residual impurities on the surface, it may be necessary to increase the pressure.

2. Evaluate the surface roughness: Adjust the pressure to obtain the appropriate roughness according to the requirements of the subsequent use of the workpiece.

- For surfaces that require good coating adhesion, an appropriate increase in roughness may be required, which may require higher sandblasting pressures.

5. Consider equipment and cost

1. Pay attention to the rated pressure range of the equipment: do not exceed the design pressure of the equipment, so as to avoid damage to the equipment and security risks.

- Exceeding the maximum allowable pressure of the sand blaster may lead to rupture of gun, hose and other components.

2. Balance efficiency and cost: Excessive pressure may increase the consumption of sandblasting materials and wear of equipment, thus increasing costs.

- Select the most economical blasting pressure under the premise of meeting the quality requirements of blasting.

Through the above comprehensive consideration and gradual test adjustment, we can find the most suitable sandblasting pressure for the actual situation, and improve the sandblasting efficiency while ensuring the quality of sandblasting.