The hard rail refers to the casting that integrates the guide rail and the base. When processing precision parts, the guide rail is processed according to the casting. That is, the shape of the guide rail is cast on the bed, and then processed by quenching and grinding. The bed and the guide rail are not necessarily integrated. For example, nailing steel rails to the bed after processing. Linear guides for machine tools that use hard rails usually refer to rolling guides, which are the kind used in linear modules, which are now often used in the machine tool industry. We usually refer to these types of components as “linear guides”.
The position tolerance of precision parts processing is the actual total change relative to the reference position. The position tolerance is used to limit the difference between the actual position of the measuring element on the mechanical part and the ideal position.
As the basis of modern machinery manufacturing technology, the precision machining technology of CNC lathes has caused major changes in the machinery manufacturing process. Compared with traditional processing technology, there are significant differences in many aspects of modern processing control, processing equipment and processing equipment. After clamping the workpiece once, the machined surface can be milled, drilled and drilled. Machining effectively avoids positioning errors caused by multiple installations, shortens the production cycle, and improves machining accuracy. Therefore, the multi-axis CNC machining technology has achieved unprecedented development.
In the SMT assembly process, we will come into contact with a variety of materials. The errors and omissions of materials, although they are low-level errors, involve too many materials and are too complicated, and the current development trend of materials is getting smaller and smaller, which is not easy to identify. At the same time, PCB boards are getting smaller and smaller, and the distance between materials is compressed to be smaller, and sometimes there is even no place to print silk screen. A little carelessness will lead to omissions, so such problems are not uncommon in actual operations.
With the development of electronic products towards miniaturization and thinning, surface mount technology (SMT) SMT chip processing emerged at the historic moment and has become the mainstream of current electronic production. So what is the technological process of Shenzhen Youqin Electronics SMT chip processing? The SMT patch processing technology is divided into single-sided and double-sided, and I will introduce it for everyone below.
Specializing in SMT foundry, daily contact with electronic materials of major brands. There are many types of electronic materials, with different shapes and packages, so there is no uniform standard for marking the polarity. Accurate identification of polarity, possible to avoid batch errors, is a basic skill that must be repaired in the SMT industry. The following is the polarity labeling method compiled by Youqin that can be considered as industry-wide.
From the production process, it can be roughly divided into laser steel mesh, electro-polished steel mesh, nano-steel mesh, electroformed steel mesh, etching steel mesh, step steel mesh, etc.
Briefly on the per capita output value of the top 10 chip companies in the US
At present, AOI is the most mainstream and most efficient detection method in the patch foundry industry. Every product of Youqin Electronics will pass AOI. AOI can detect many kinds of defects, including poor solder paste, poor component placement, and poor reflow soldering. Some of them can be repaired. The following is an introduction to the most frequently encountered welding defects and solutions during the production process:
The essence of the “three preventions” in electronic processing is to coat a protective film on the protected surface. The protective effect is related to the coating method and coating process. Spraying basically belongs to the protection of the PCBA surface, while dipping can protect the components. Three anti-paint is a kind of specially formulated paint, used to protect circuit boards and related equipment from environmental erosion, thereby improving and prolonging their service life, ensuring the safety and reliability of use.