When sandblasting, the workpiece usually has the following requirements:

1. Workpiece surface cleanliness: The surface of the workpiece should be as far as possible to remove oil, rust, dust and other impurities to ensure the sandblasting effect and coating adhesion. If there is serious dirt on the surface, it may affect the contact between the sand and the workpiece surface, and reduce the quality of sand blasting.

2. Workpiece material: Different materials have different hardness and wear resistance. Soft materials such as aluminum, copper, etc. need to control the sand blasting pressure and time to avoid excessive damage to the surface; Harder materials such as steel can withstand stronger sandblasting.

3. Workpiece shape and structure: complex shapes or workpieces with internal cavities and grooves may cause sand particles to accumulate in some parts, affecting the uniformity of sandblasting. Therefore, for such workpieces, it is necessary to choose the appropriate sandblasting Angle and mode to ensure comprehensive handling.

4. Dimensional accuracy requirements: If the workpiece has strict requirements for dimensional accuracy, the parameters need to be carefully controlled during the sandblasting process to avoid affecting the size due to excessive removal of materials.

5. Surface roughness requirements: According to the subsequent processing process or use needs, clear the required surface roughness, in order to choose the appropriate sand type, size and sand blasting process parameters.

6. The stability and fixing method of the workpiece: during the sandblasting process, the workpiece should be stable and fixed to prevent uneven sandblasting or damage to the workpiece due to vibration or movement.

7. Heat resistance: Some sandblasting processes may produce a certain amount of heat, and appropriate cooling measures need to be considered for heat-resistant workpieces.

In short, before sandblasting, fully understand the characteristics and requirements of the workpiece, and select the appropriate sandblasting process and parameters accordingly, is the key to ensure the quality of sandblasting and meet the processing needs.