At the beginning, the manufacturing process of steel mesh in Changsha SMT small batch processing factory is mainly to make plates by photography, and then chemical etching is used. In addition, laser cutting or electroforming is used to make plates for steel mesh in Changsha SMT processing.
Changsha smt proofing briefly introduces the advantages and disadvantages of three SMT steel mesh processing methods for comparison:
1. Laser processing method
At present, laser processing is the most widely used processing method of steel mesh in SMT small batch chip processing factory. The principle is to use laser energy to melt metal and cut out openings. Advantages: The speed is faster than that of chemical etching method, and the opening size of steel mesh is easy to control. The steel mesh wall obtained by laser processing method will have a certain cone shape, which is convenient for demoulding. Disadvantages: When the openings are dense, the local high temperature generated by laser may cause the deformation of adjacent hole walls. The equipment investment is large.
2. Chemical etching method
Chemical etching is the initial processing method of steel mesh in SMT chip processing. Advantages: low equipment investment and low cost. Disadvantages: If the corrosion time is too short, the hole wall of SMT steel mesh may have sharp corners; if the corrosion time is too long, the hole wall size may be enlarged. Accuracy is not accurate enough.
3. Electroforming method Electroforming method
Mainly relying on metal materials (mainly nickel) to continuously accumulate and accumulate to form the steel mesh in SMT chip processing.
Advantages: SMT steel mesh manufactured by electroforming method has high dimensional accuracy and smooth hole wall, and the opening is not easily blocked by solder paste. Disadvantages: High cost and long manufacturing cycle. No matter the steel mesh processed by chemical etching or laser cutting, there will be the phenomenon of opening blockage in the process of SMT chip processing and printing, which requires regular cleaning of the steel mesh. The electroforming method has become the main processing method of solder paste printed steel screen for fine pin spacing components in SMT small batch chip processing factory because of its advantage of not being blocked by solder paste.