SMD machine, also known as "mounter", "surface mount system", it is configured in the dispensing machine or screen printing machine after, is through the mobile mount head to surface mount components accurately placed on the PCB pads of a device. It is used to realize high speed and high precision to place the components on the equipment, it is the most critical and complicated equipment in the whole SMI, production. Mainly divided into manual and automatic two kinds.
2.SMD machine working principle - structure function
The current placement machine varieties many, but whether automatic high-speed placement machine or manual low-speed placement machine, it is by the frame, PCB transmission and bearing organization, drive system, positioning and alignment system, placement head, feeder, optical identification system, sensor and computer control system composition, the following we briefly introduce its function.
The frame ---- is the root of the machine, all the transmission, the positioning organization are and the feeder are fixed on it solidly, therefore it is necessary to have the mechanical strength and the rigidity which satisfies.
PCB transmission and bearing organization ---- transmission organization is placed on the rail of the ultra-thin belt transmission system, its role is to send the PCB to the reservation position, after the placement and then send it to the next process.
Drive system ---- it is the key organization of the mounter, also is the primary index of the evaluation of the accuracy of the mounter, it includes XYZ drive layout and servo system, the function includes supporting the movement of the mounter head and supporting the PCB bearing flat.DIP Mounter
3. Mounter working principle - arch type
Arch frame type bonder working principle: first component feeder, the substrate is fixed, the bonder head moves back and forth between the feeder and the substrate, the component is taken out from the feeder, then after the adjustment of the position and direction of the component, and finally pasted on the substrate.
The advantages of this type of machine are: simple system structure, high precision, suitable for various sizes and shapes of components, even shaped components, feeders are available in the form of belts, tubes and trays. Suitable for small and medium-sized production, can also be combined with multiple machines for mass production.
4. The working principle of the placement machine - turret type
Turret type bonder working principle: as shown below, the component feeder is placed on a single-coordinate moving material car, the substrate is placed on an X / Y coordinate system moving table, the bonder head mounted on a turret, work, the material car will move the component feeder to take the material location, the bonder head vacuum suction nozzle in the material location to take the component, the turret rotation to the bonder location, in the rotation process after the component After the adjustment of the position and direction of the components during the rotation, the components are placed on the substrate.
This machine is superior in speed and suitable for mass production, but it can only be used for components with ribbon packaging, if it is a dense foot, large integrated circuit, only tray packaging, it can not be completed, so it also depends on other machines to work together.