SMT chip manufacturers in Shanghai SMT production and acceptance should pay attention to what matters?

Stencil making is crucial to the SMT process. It will directly determine if tin is uniform and full on each pad, thus affecting the soldering reliability of SMT components after reflow soldering. In general, the stencil opening requires careful analysis of the characteristics of each PCB, for some high-precision and quality requirements of the circuit board, laser steel mesh must be used, and requires SMT engineers to discuss the process to confirm the process, the appropriate adjustment of the opening The aperture, to ensure the tin effect. .

In the SMT steel production, generally note:

1.ME prepares stencils from suppliers according to the relevant documents and information provided by the engineering department.

2. Stencil frame size requirements (550MM * 650MM 370MM * 470MM, etc., mainly based on the structure of the printing press and product specifications may be)

3. Stencil marked (product type, thickness, production date, etc.) 4. Stencil thickness (scraping plastic generally 0.18MM-0.2MMM, scraping tin 0.1MM-0.15MM)

5. Stencil opening and opening size (anti-tin beads generally open V-type, U-type, concave, etc., depending on the specific type of component to be.)

6. Into the board direction and placement machine to be unified

SMT steel net acceptance note:

1. Check the way and size of the stencil opening meets the requirements

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

3. Check the stencil frame size is correct

4. Shanghai SMT manufacturers to check whether the label is complete

5. Check the flatness of the stencil is level

6. Check the tension of the stencil is OK

7. Check if the position and number of stencil openings are consistent with the GERBER documents