PCB Technical - GKG printing machine for SMT placement equipment

GKG printing machine for SMT placement equipment

Modern solder paste printers generally consist of plate loading, solder paste addition, imprinting, and circuit board transfer. Its working principle is: first fix the circuit board to be printed on the printing positioning table, and then the solder paste or red glue is printed on the corresponding pad through the stencil by the left and right scrapers of the printer, and the printed PCBA board is evenly printed. Input to the placement machine through the transfer station for automatic placement.

1. Brand-new image recognition system-geometric matching can achieve stable Mark point recognition for tinned, copper plated, and flexible boards. Use a printing machine from the perspective of use: high-speed stability is the fundamental requirement. The Mark point recognition of the printing machine is the primary factor of the machine: If the Mark point recognition difference often occurs, the Mark point recognition is not possible and manual intervention affects the production, and the corresponding operator needs to be added, which increases the cost of use. For example: 4000pcs/day work plan output; if the printer's ability to identify Mark points is 90%, 400 PCBs require manual intervention at least 2 hours: 2 hours can bring benefits to the OEM factory.

2. High-precision servo drive system The complete set of servo drive system uses the British Trio motion control card as the drive system to improve the stability of the system. There are a total of 10 degrees of freedom in GKG, of which 8 are servo-driven, high-precision CCD positioning system, precise optical vision system: using ring lights/coaxial lights, etc., unique optical path system, omni-directional light source compensation, to achieve PCB/STANCIL accurate MARK point recognition, CCDX/Y directions are all high-precision Servo motor, combined with high-precision BALL SCREW, together ensure the accuracy of capturing images and thus the accuracy of the machine.

(1) Platform calibration (200510037196.2) The platform calibration is realized by moving in the three directions of X/Y/θ. The X/Y/θ drives are all servo motors to ensure the accuracy of the calibration.

(2) The movement of the squeegee is driven by a servo motor, coupled with a double slider mechanism to achieve smooth operation, reduce operating vibration, achieve the uniformity of the thickness of the solder paste after printing, and reduce the operating noise of the machine.

(3) Z-axis low-noise servo demoulding control The Z-axis is driven by a high-performance servo motor to achieve low-noise movement and ensure the speed and accuracy of operation.

(4) The servo drive mechanism for PCB width adjustment.

Because the servo adopts a closed-loop control mode, it is more effective to ensure the stability of each side clamp.

3. PCB positioning system The PCB positioning system of the GKG printing machine: round belt conveyor guide, magnetic thimble, vacuum nozzle, original upper pressure device and flexible side pressure device. The PCB flexible side pressing mechanism has an elastic side clamp system on the moving rail side of the transportation rail, which is designed for thin PCB boards to ensure that the PCB boards are not deformed and do not pop up! The PCB press-up device has two servo press plates beside the transportation rails, and the PCB press-up system is designed for thin, easily deformable PCBs.

1) Prevent PCB deformation and upturning of the four corners during clamping;

2) Ensure that the height of the PCB of all different thicknesses is consistent with the height of the guide rail;

3) The pressure plate is retracted to both sides to make the stencil and PCB fully contact, the solder paste has a clear edge, a smooth surface, and an appropriate thickness.

4. The programmable floating self-adjusting stepping motor drive print head is designed for the different pressures of the front and rear squeegee and the stability of the lifting, preventing the leakage of solder paste and the blade has a certain flexible clamping design, the pressure of the squeegee, lifting The speed, printing speed, and printing range are all adjustable by software, and it provides customers with a variety of demolding methods to adapt to PCB boards with different tinning requirements, providing customers with a good printing control platform.

5. The quality of the Snap-off method directly affects the printing effect. GKG has specially designed three demolding methods for different types of PCB demoulding requirements, which are suitable for PCB boards with different tinning requirements:

1) "Pick up the scraper first and then demould", it is more commonly used, mainly ordinary plates;

2) "First demould and then scraper", use a thinner PCB;

3) "The scraper should be separated first, keep the pre-pressure value, and then demould" to prevent sharpening, blocking the mesh, and less tin. Some poor demolding problems are specially designed for 0.3BGA and small-pitch demolding. The demolding is a programmable design. The demolding speed can be from 0.001-20mm/s. The boards with different requirements adopt different demolding methods and demolding. Mold speed.

6. GKG dedicated manual/automatic adjustment jacking platform GKG dedicated manual/automatic control PCB thickness adjustment jacking platform, compact and reliable structure, stable lifting, manual/automatic adjustment of PIN needle height, can accurately realize the position of PCB boards of different thicknesses Height adjustment.

7. Smart steel mesh clamping structure and highly adaptable steel mesh frame clamping system, all steel meshes from 420*500 to 737*737 can be used, no additional fixtures are needed, so as to achieve various sizes The printing of the screen frame can realize the rapid change of models in the production process.

8. Automatic and effective stencil cleaning function. The system provides three cleaning methods: dry cleaning, wet cleaning, and vacuum. These three methods can be used in any combination, and when the customer does not need automatic cleaning, manual cleaning can be realized under the production interface., Thereby shortening the cleaning time and improving production efficiency.

(1) The CCD part is separated from the cleaning part. When the CCD is working, the CCD part moves independently, reducing the load of the servo motor and improving the movement speed and accuracy of the machine.,

(2) Wet washing adopts alcohol pumping method to make the machine operation safer.

(3) Vacuum cleaning uses a vacuum method to make cleaning more thorough.

9. The front door of the machine with an electrical separation structure that is easy to maintain is equipped with the air control part and the conversion card, and the electric control part and the industrial control part at the back of the machine. This structure is simple, safe and easy to maintain.

10. 2D solder paste printing quality inspection and analysis function to check the printing effect and ensure the printing quality. 11 Simple and user-friendly Chinese/English operation interface adopts WINDOWS2000 operation interface, with good man-machine dialogue function, simple and convenient operation, right Fault self-diagnosis sound, light alarm and prompt the cause of the fault and other functions.