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SMT steel net production and acceptance should pay attention to what matters?

420 Published by FASTPCBA 9月 20,2018

SMT steel net production and acceptance should pay attention to what matters?

Steel-mesh fabrication is crucial to the SMT process, which will directly determine whether the tin on each solder pad is uniform and full, thus affecting the welding reliability of SMT components after reflow soldering.Generally speaking, it is necessary to carefully analyze the characteristics of each PCB to open the steel mesh. For some circuit boards with high precision and quality requirements, laser steel mesh must be adopted. Besides, SMT engineers need to conduct a meeting to discuss and confirm the process flow, and adjust the aperture of the opening appropriately to ensure the tin loading effect.

When making SMT steel mesh, it is generally noted that:

1.ME makes steel mesh according to relevant documents and materials provided by the engineering department.

2. Frame size requirements of steel grid (550MM*650MM 370MM*470MM, etc.) are mainly based on the structure of the printing press and product specifications.

3. Marking on steel mesh (product model, thickness, production date, etc.)4. Thickness of steel mesh (generally, the scraping glue is 0.18mm-0.0.mmm, and the scraping tin is 0.1mm-0.15mm)

5. Open mode and size of the steel mesh (generally open V, U, concave, etc. of the tin bead, specific shall be determined according to the type of each component).

6. The direction of the feed plate and the patch machine should be unified

SMT steel net

SMT steel net

Notes for acceptance of SMT steel net:

1. Check whether the way and size of the steel mesh openings meet the requirements

2. Check whether the thickness of the steel mesh meets the product requirements

3. Check whether the steel mesh frame size is correct

4. Check whether the label of the steel mesh is complete

5. Check whether the flatness of the steel mesh is horizontal

6. Check whether the tension of the steel mesh is OK

7. Check whether the position and quantity of steel mesh openings are consistent with GERBER documents

Steel mesh making is an important part of quality control of the whole SMT processing process. Engineers must pay full attention to it. Customers should not deliberately reduce costs, resulting in poor tin loading effect after using the steel mesh and affecting the whole production schedule.

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