1. Strictly inspect the LED raw materials of the solid crystal station

1. Die: Mainly manifested as solder pad contamination, die damage, different sizes of die cut, and tilt of die cut, etc. Preventive measures: Strictly control incoming material inspection, and require suppliers to improve when problems are found.

2. Bracket: The main manifestations are the excessive deviation between the Θ dimension and the C dimension, the discoloration and rust of the bracket, and the deformation of the bracket. Poor incoming materials are all problems of the supplier, and the supplier should be notified to improve and strictly control the incoming materials.

3. Silver glue: The main manifestations are the poor viscosity of the silver glue, the expiration of the service life, and the storage conditions and thawing conditions that are inconsistent with the actual standards. Regarding the viscosity of silver glue, generally there will not be too many problems when it is put into production after project evaluation, but it does not mean that this kind of silver glue is good. If any defects are found, the project will be evaluated again. Other service life, storage conditions, thawing conditions, etc. are all controlled artificially. As long as the SOP is strictly followed, there will generally not be too many problems.

2. Reduce unfavorable human factors

1. Operators illegal operations: such as not wearing gloves, the silver glue goes online without thawing after being taken out of the refrigerator, and the operators not operating according to the SOP, or being unskilled in the operation of the machine, etc., will affect the quality of the die.

Preventive measures: foremen strengthen management, operators work according to SOPs, quality assurance personnel strengthen audits, strengthen education and training for unskilled personnel on machines, and are not allowed to officially start without a job certificate.

2. Improper adjustment of maintenance personnel: The countermeasure is to improve the technical level. For example, the height of the crystal taking, the height of the solid crystal, the height of the thimble, the setting of some delay time, the setting of the motor parameters, the setting of the table parameters, etc., all need to be adjusted to the best condition according to the standard.

3. Ensure that there will be no machine defects

The ASM automatic die bonder machine is mainly manifested in the impact of some parts or mechanical structure of the machine on the quality of the die caused by the poor understanding of the system. Be sure to ensure that all functions of the machine are normal.

4, implement the correct tuning method

1. The light spot is not properly aligned: Countermeasures-re-calibrate the light spot to ensure three points and one line.

2. Improper adjustment of various parameters: For example: picklevel, bondlevel, ejectorlevel delay time, motor parameters, etc., it can be solved to add a few steps and subtract a few steps can still be done, but the result is completely different. The same is the height of the thimble. When the crystal grains cannot be absorbed, someone exerts a strong parameter, but does not consider whether the thimble is blunt or broken. As a result, the crystal grains are damaged and the θ angle is shifted. The coordination of delay time and motor parameters is also the same. If the coordination is not good, the action of the welding arm will be different, which will also cause abnormal quality.

3. Improper binary setting: Countermeasures ---- reset the binary setting.

4. The machine adjustment standards are inconsistent. For example: when adjusting the dispensing, the dispensing spring is pressed to death, and the dispensing head has no elasticity at all. As a result, it is useless to adjust the parameters. Another example is the adjustment of the hooks. If the upper and lower hooking and ejection displacements of the hooks are not adjusted according to the standard, it is easy to cause material running and deformation of the bracket. Another example is the pressure of the welding arm. If it is not adjusted according to the standard, it will also affect the quality of the die, and it will not be adjusted well if it is adjusted with parameters.

5, master the process

1. Whether the cleaning of the silver glue tank is regularly cleaned.

2. Whether the choice of silver glue is reasonable.

3. Whether the workers wear gloves and masks to work.

4. Baking conditions, time and temperature of solid crystal materials.

6, keep the environment in line with requirements

1. Is there too much dust?

2. Whether the temperature and humidity are within the standard range