PCBA Tech - SMT patch structure principle and operation process

The placement machine is the production equipment with the highest technical content on the SMT production line. It is responsible for accurately and non-destructively placing components on the specified position of the PCB circuit board. There are many technologies to measure the function of the placement machine. The most important is the placement speed, Mounting accuracy, PCB standard, mounting scale, etc. In the entire SMT production line, users often focus on the placement machine, and its function is the primary criterion for determining the production line.

With the continuous development of SMT placement technology, there are now many placement machines used in various applications and environments, such as multi-function placement machines, small placement machines, high-speed placement machines, LED dedicated placement machines, etc., and many more Non-customized placement equipment.

SMT basic introduction: In a SMT placement machine production line, the placement machine is the most important equipment. Its technology is developing rapidly. From the early low-speed placement machine to the current optical placement machine, it has multiple functions and flexible connections., Can fully meet all SMT production needs.

SMT placement machine summary 1: The placement machine is a machine that pastes a single electronic patch component on the PCB board. It can generally be divided into high-speed machines and general-purpose machines. The machine is to mount relatively large components. It is mainly controlled by PT or other computers, which means that it is similar to remote control, and all operations of the machine are controlled by computers.

SMT placement machine summary 2: placement machine: also known as "SMT equipment", "mounting machine", "Surface Mount System" (Surface Mount System), in the production line, it is configured in the dispensing machine or screen printing machine After that, it is a device that accurately places surface mount components on PCB pads by moving the placement head. Divided into two kinds of manual and automatic.

A comprehensive analysis of the structural principle of the SMT placement machine: the automatic placement machine is an equipment used to achieve high-speed, high-precision and fully automatic placement of components. It is the most critical and complex equipment in the entire SMT production. The placement machine is the main equipment in the SMT production line. The placement machine has developed from an early low-speed mechanical placement machine to a high-speed optical centering placement machine, and has developed to a multi-functional, flexible connection and modularization.

What is the operation process of SMT placement machine?

SMT placement machine is mainly used in the fields of LED lights, electronic products, and display screens. It has the characteristics of intelligent placement operation, more accurate identification and positioning, and more durability. It is through the functions of absorption-displacement-positioning-placement, etc., without damaging the components and the printed circuit board, it can quickly and accurately mount the SMC/SMD components to the specified pad positions on the PCB board.

1. Preparation before SMT placement machine

1. Prepare relevant product process documents.

2. Pick up materials (PCB, components) according to the mounting schedule of the product process documents and check them.

3. For PCBs that have been opened, clean and bake them according to the specific conditions such as the length of the unsealing time and whether they are damp or polluted.

4. Check the components after opening, and deal with the damp components in accordance with the management requirements of SMT process components.

5. According to the specifications and types of the components, select the feeder that escapes, and install the component tape feeder correctly. When loading -. You must align the center of the component with the pickup center of the feeder.

6. Equipment status check:

a. Check that the air pressure of the air compressor should meet the equipment requirements, generally 6kgjf/cm2 ~ 7kgf/cm2.

b. Check and make sure that there are no obstacles in the guide rail, the moving range of the placement head, around the automatic replacement nozzle library, and the pallet rack.

Two, SMT placement machine boot process

1. Turn on the machine in accordance with the equipment safety technical operating regulations.

2. Check whether the air pressure of the placement machine meets the equipment requirements, generally about 5kg/crri2.

3. Turn on the servo.

4. Return all axes of the placement machine to the source point.

5. According to the width of PCB, adjust the width of the guide rail of the placement machine FT1000A36. The width of the guide rail should be greater than the width of the PCB by about Imm, and ensure that the PCB slides freely on the guide rail.

6. Set up and install the PCB positioning device:

1. First, set the PCB positioning method according to the operating rules. Generally, there are two methods of pin positioning and edge positioning.

2. When using pin positioning, install and adjust the position of the positioning pin according to the position of the PCB positioning hole L. Make the positioning pin exactly in the middle of the positioning hole of the PCB to make the PCB go up and down freely.

3. If edge positioning is used, the position of the stopper and the top block must be adjusted according to the outline size of the PCB.

7. Place the PCB support thimble according to the PCB thickness and external dimensions to ensure that the force on the PCB is even and not loose during patching. If it is a double-sided mounting PCB, after the B (first) side is mounted, the position of the PCB support thimble must be re-adjusted to ensure that when the A (second) side is mounted, the PCB support thimble should avoid the already mounted side B. Installed components.

8. After the setting is completed, the PCB can be installed for online programming or patch operation.