A good way to analysis the PCB quality before SMT process

There is a good way to distinguish the advantages and disadvantages of PCB circuit boards before your SMT process. qihe smt pick and place machine will sharing you some tips today .
With the rapid development of mobile phone, electronics, communication industries, etc., it also promotes the continuous growth and rapid growth of PCB circuit board industry, people’s requirements for the number of layers, weight, precision, material, color, reliability, etc. Come higher.
However, due to the fierce price competition in the market, the cost of PCB board materials is also in a rising trend. In order to enhance the competitiveness of the center, more and more manufacturers are monopolizing the market at low prices. However, these ultra-low-cost backsides are obtained by reducing material costs and process manufacturing costs, but the devices are generally prone to cracks (cracks), easy scratches, (or scratches), and their precision, performance and other general factors are not qualified. , which seriously affects the solderability and reliability of the product used.
Facing all kinds of PCB circuit boards on the market, Baineng.com can distinguish the quality of PCB circuit boards from two aspects; the first method is to judge from the appearance, and the other is from the quality standard requirements of the PCB board itself. discriminate.

How to judge the quality of PCB circuit board
Top of the list: Distinguish the quality of the circuit board from the appearance
In general, the appearance of the PCB circuit board can be analyzed and judged through three aspects;
a. Standard rules for size and thickness. The thickness of the circuit board is different from that of the standard circuit board, and customers can measure and check according to the thickness and specifications of their own products.
b. Light and color. The external circuit boards are covered with ink, and the circuit boards can have an insulating effect. If the color of the board is not bright and there is less ink, the insulation board itself is not good.
c. The appearance of the weld. The circuit board has many parts. If the welding is not good, the parts are easy to fall, which will seriously affect the welding quality of the circuit board. It is very important to have a good appearance, careful identification, and a strong interface.

Second: high-quality circuit boards need to meet the following requirements
a. It is required that the phone should be easy to use in the future when the components are installed, that is, the electrical connection should meet the requirements;
b. The line width, line thickness and line spacing of the line meet the requirements to avoid line heating, open circuit, and short circuit;
c. The copper skin is not easy to fall off under high temperature;
d. The appearance of copper is not easy to oxidize, which affects the speed of the device, and it will be broken soon after oxidation;
e. No additional electromagnetic radiation;
f. The shape is not deformed, so as to avoid the deformation of the shell after the installation and the dislocation of the screw holes. Now they are all mechanized devices, and the hole position of the circuit board and the deformation error between the circuit and the plan should be within the permitted range;
g. High temperature, high humidity and special environment resistance should also be considered;
h. The mechanical properties of the surface should meet the requirements of the device;

you can choose a reflow oven to meets your need like qfr630,qrf835,qrf1235
stencil printer model qh3040,qp3250,qfa5060
Also we have different kinds of smt pick and place machine like tvm802a,tvm802b,tvm802ax,tvm802bx,tvm925s,tvm926s,ql41,qm61,qm62,qm81,qm10