簡體中文繁體中文???English

Home > Maintenance > Lamination Plate...



For the PCB, CCL industry, the lamination steel plate is a necessary precise flat plate mould in the production. The quality of the mould is related to its production yield and quality problems. So if the lamination steel plate has the scratches, dents, pinholes, plate and adhesive residue on surface and other anomalies that maintenance services shall be provided by grinding maintenance factory with complete equipment and experience.


一、Maintenance Technology

1. Maintenance operation flow chart

2. Main process description

(1) IQC Items: A, scratch depth; B, dent depth; C, pinhole depth ; D, flatness; E, thickness (parallelism) tolerance ;F, adhesive residue;
(2)Regrinding Maintenance of scratches, dents, pinholes : Grinding on-line in batches in accordance with the scratches depth on the steel plates can maintain the normal life of steel plates; Checking the depth of dents or pin holes and pick out the serviceable steel plates for repairs, the cost increasecan be avoided.
(3) Impacts of steel plate thickness deviation (parallelism) on PCB lamination process: the greater steel parallelism deviation, the more likely cause lamination process on the layer bias, adhesive lost, white rim, white corner, uneven pressure and other problems. But generally, the grinding factory does not understand the impacts of steel thickness deviation on lamination process, and does not notice much about parallelism adjustment problems when regrinding.The correct work mode is than when testing the steel plate incoming quality. Use the three decimal ultrasonic thickness gauge to measure the steel plate, namely 9 points measurement. After really grasp the plate thickness deviation, making the further adjustments maintenance. Make every effort to adjust the steel plate thickness deviation within best practices (0.03mm ~ 0.05mm), in order to significantly reduce the defect rate of customer lamination process.


Ⅱ Grinding Setting

1. Dry grinding machine: In grinding process,
(1) High temperature
 (2) Static electricity
 (3) Sparks will be generated, easy to make steel unprovoked cause stress, deformation, hardness reduction, magnetism enhance and other phenomena, so dry grinding machine is not suitable for using in sheet metal flat mould. 
2、濕式研磨機
2. Wet grinding machine

 

       

(1) Wet grinding machine classification

(2)Comparison of two grinding machines


Grinding Machine

Cooling Method

Probability of Dent Generating

Parallelism

Belt type

Single sided

Yes

Non-adjustable

Roller type

Double sided

No

Adjustable



Scrap iron remained on the belts cannot be flushed and cleared,easily resulting in dents on the steel plate surface.

This figure is the roller grinding machine diagram,if removing the steel plate, the scrap iron can be completely flushed and cleared, not resulting in dents on the steel plate.