4. Component detection system

The component detection system is a necessary guarantee for placement accuracy and placement Correctness.Divided into component optical identification system and component attitude detection.

1): Optical recognition system is a fixed installation of an optical camera system, which is used to identify the outline of the component through the camera during the rotation of the placement head for optical imaging, and to measure and record the center position and rotation angle of the device relative to the camera. Down to the transmission control system, the XY coordinate position deviation and θ angular deviation compensation, the advantage is the accuracy and flexibility of the device can be applied to a variety of shapes and shapes. It has a reflection recognition method based on the device electrode as the identification basis, and the recognition accuracy is not affected by the size of the nozzle. Generally, the SOP, QFP, BGA, PLCC and other devices adopt the reflection recognition method.

The transmission recognition method is based on the component shape, and the recognition accuracy is affected by the size of the nozzle. When the nozzle shape is larger than the device contour, the contour of the nozzle is identified in the image. Since the light source of the optical camera system is used after a period of time, the light intensity will gradually decrease, because the light intensity is proportional to the gray value of the solid-state image conversion, and the larger the gray value, the clearer the digital image. Therefore, as the light intensity of the light source decreases, the gray value also decreases, but the gray value stored in the machine does not automatically decrease as the light intensity of the light source decreases, and when the gray value is lower than a certain value When the value is used, the image cannot be recognized.

So the calibration detection must be performed periodically.①Re-calibration ② Adjust the aperture focal length. The gray value will be proportional to the light intensity of the light source. When the light intensity of the light source is too weak to recognize the device, the light source must be replaced, and the lens, the glass piece, and the dust on the reflector should be cleaned regularly.In order to prevent the bad recognition caused by dust or devices affecting the intensity of light source, on the other hand, the initial data of the camera must be set correctly.

2): The whole attitude detection is based on the linear sensor installed on the rack, which scans the device horizontally at high speed to detect the absorption state of the device, and accurately detects the thickness of the device. When the thickness values set in the part storehouse and the measured values exceed the allowable error range, poor thickness detection will occur, resulting in the loss of the part. Therefore, it is very important to correctly set up the device data and the benchmark data of thickness detection and control sequence in the part warehouse. It is necessary to retest the thickness of the device frequently. At the same time, the linear sensor should be cleaned regularly to prevent the detection of the thickness and absorption state of dust, impurities, oil contamination and other devices adhering to it.

5. The correct rate of device tape mismatching is a result of multiple factors. In addition to the device itself, the poor device tape has a great impact on it. The main performances are as follows:

A: The pitch of the perforations is large.

B: The component shape is poor.

C: The braided square hole is irregular or too large in shape, causing the device to be hung or laterally flipped.

D: The tape and the plastic hot press tape are too strong to be peeled off properly, or the device is stuck to the bottom tape.

E: There is oil on the bottom of the device.

6. How to use the excellent performance equipment to make the maximum profit is the goal pursued by the enterprise.

How to achieve the goal depends on the scientific management method:

A: Establish a regular staff training system to improve the quality of employees. People are the soul of enterprises and the foundation of enterprise entrepreneurship and development. Therefore, we must pay attention to the training of skills and ideas of the workforce. We should be able to operate the equipment proficiently and correctly, correctly install and use the feeder, and regularly maintain and maintain the equipment to effectively ensure product quality, reduce material consumption and improve production efficiency. .

B: Establish a regular equipment maintenance plan. Promote TPM management and implement preventive performance maintenance and overhaul to reduce equipment downtime due to temporary failure surfaces and pursue maximum equipment utilization efficiency.

C: Sound equipment maintenance files.

①: Maintenance record. Record the phenomenon of fault occurrence, analysis process, processing situation, spare parts replacement, etc.

②: Replacement Records for Spare Parts. Analyze the reasons for spare parts replacement, spare parts replacement cycle, reduce spare parts backlog and reduce production costs.

D: Complete equipment operation file.

①: The device running status is timely registered in the table.

②: List of equipment operating status.

③: Operation status monitoring diagram.

④: The maintenance worker monitors the operation status of the equipment on duty.

⑤: List of equipment monthly operation.

⑥: Equipment monthly running status summary table.