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The working principle of SMT machine

点击次数:0  信息来源:  发布时间:2018-08-14 17:58:44  【打印此页】  【关闭
Arch type
Component feeder, the base board (PCB) is fixed, stick the opening (install multiple vacuum suction mouth) moves back and forth between the feeder and the base board, remove elements from the feeder, after adjustment of element position and direction, and then put placodes. Because stick opening is installed in the arch type X/Y moving beam, so its name.
Arch type placement machine for element position and direction of adjustment methods:
1), the machine to adjust the position, the suction nozzle rotating direction, this method can achieve the precision co., LTD., already late model don't use.
2), laser identification, X/Y coordinate system adjustment position, suction nozzle rotating direction, this method can realize the identification in the process of flight, but can not be used in Chen pieces of BGA ball grid column.
3), camera recognition, X/Y coordinate system adjustment position, suction nozzle rotating direction, general camera fixed, opening flying across over the camera, image recognition, than laser identification delay a little time, but can also identify any element, there are also implemented in the process of flight recognition camera recognition system, mechanical structure with other sacrifices.
This form due to the long distance stick the opening moves back and forth, so the speed limit. General use multiple vacuum suction feeding mouth at the same time picking (up to 10) and using the double beam system to improve the speed, that is, a beam on the post opening in picking at the same time, another post put the opening on the beam element, speed is almost twice as fast than single beam system. But in practical application, at the same time feeding conditions is difficult to achieve, and different types of components need to switch to a different vacuum suction mouth, change of absorb mouth with time delay.
The advantage of this kind of model is: system structure is simple, and can realize high precision, suitable for all kinds of size, shape, components, and even different components, feeder with strip, tube, tray form. Suitable for medium and small batch production, can also be more units for mass production.
The turret type
Feeder components on a single coordinate moving skip, base board (PCB) on an X/Y coordinate system moving workbench, stick the opening installed on a turret, job, skip move component feeder to take the position, the patch head of vacuum suction mouth in the feeding position is fetching components, the turret rotation to the patch position (with the feeding position is 180 degrees), in the process of turning through position and orientation adjustment, the element will be components put placodes.
Adjust your element position and direction of methods:
1), the machine to adjust the position, the suction nozzle rotating direction, this method can achieve the precision co., LTD., already late model don't use.
2), camera recognition, X/Y coordinate system adjustment position, the suction nozzle rotating direction, the camera fixed, opening flying across over the camera, image recognition.
General, turret is installed on a dozen to over 20 opening, each patch head installed 2 ~ 4 vacuum suction nozzle (earlier models) to 5 ~ 6 vacuum suction nozzle (current models). Because of the characteristic of the turret, the action is subtle, choose in suction nozzle, feeder mobile in place, take element, element identification, Angle adjustment, the workbench mobile (including position adjustment), stick put components such as action can be done at the same time period, so in the true sense, high speed. At present the fastest time period is 0.08 ~ 0.10 seconds a element.
This machine is superior in speed, suitable for mass production, but it can only use strip packing element, if it's feet, and large integrated circuit (IC), only the pallet packaging, is unable to complete, so also depends on other models to work together. The device structure is complex, expensive, the latest models about US $500000, is more than three times that of arch type.
Constitute a
The current placement machine varieties of many, but whether it is a fully automatic high-speed placement machine or manual placement machine at low speed, it's all the layout have similarities. Automatic placement machine is controlled by computer, integrates opto-mechatronics gas high precision automation equipment, mainly composed of frame, PCB transmission and bearing, drive system, and the positioning of the system, in SMT, feeder, optical identification system, sensor and computer control system, its displacement - after a draw - positioning - placement of function, completed the SMD components rapidly and accurately.
rack
Frame is the warp and woof of the machine, all transmission, positioning tissue were and feeder are strong fixed on it, so it is necessary to have a meet mechanical strength and rigidity. The current placement machine there are various types of chassis, the primary contains all the casting and the steel plate welding. First all the sex is strong, good rigidity, small deformation, stable when working, usually applied in the advanced machine; The second has the processing briefly, the characteristics of low capital. Machines to choose what kind of layout in detail frame depends on all the drawing and bearing, in the process of operation should be smooth, easy, no vibration.
PCB and the hosting organization
Transport organization is on the guide rail system of ultra thin leather belt transmission, belt usually installed in the path of marginal, its role is to send PCB to reserve position, patch again after she sent them to the next procedure. Transport organization first divided into all the type and block type two kinds, the approach into the PCB, SMT and have been on the same track is sent out, choose the limit block limit, locating pin upward position, pressure, pressure groups will PCB supported the counter support bar up to end of PCB location fixed. Dowel location accuracy is lower, when demand for high precision optical system, also can choose only positioning time is longer than the other. sectional Usually divided into three sections, as in the former period on road from acceptance of PCB technology, center positioning clamping end as PCB, after a period of PCB as to the next working procedure, its advantage is to cut PCB delivery time.
Drive system
Drive system is the key of the placement machine organization, is also the evaluation of the primary goal of the placement machine precision, it includes the XYZ transmission layout and the servo system, movement and supporting functions include support head bearing flat PCB.
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