Surface roughness Ra is a symbol often used by our machines. It is basically our old friend. If that drawing does not have it, it is estimated that the drawing will be scrapped. It is such a symbol for dealing with every day. Do you know why 0.8 is used , 1.6, 3.2, 6.3, 12.5, and not other numbers? I believe that members of the community have also encountered this confusion when they are learning and using it, but they have not studied the answer in detail. All of this must start with the great mathematics, and now I will explain it in detail.

Is it designed based on KKD (experience, intuition and courage) alone? Explain the advantages and necessary knowledge of tolerance design concisely and easily!

There are many transmission modes. Among the four major types of transmission methods (mechanical, electrical, hydraulic, and pneumatic) that are currently widely used, none of the power transmissions is perfect. Today I will share with you the comparison of the pros and cons of the 4 transmission methods.

Stability is well understood, the ability to maintain or restore the original balance form under force. For example, the thin rod under pressure suddenly bends, the load-bearing thin-walled member folds, or the column of a building collapses. Today I will mainly talk about the understanding of stiffness and strength.

When I came into contact with people in 96 and 97, I was generally interested in electricity. Many of my friends are also learning and don’t want to work on machinery alone. But this is also a disadvantage. It feels bad for people and feels not doing business properly. The roots of machinery are not well established. But 96 and 97 have strong learning ability, after all, they are young people.

Solenoid valve is an automatic basic element used to control the direction of fluid, which belongs to the actuator; it is usually used in mechanical control and industrial valves to control the direction of the medium, so as to achieve the control of the valve switch.

Predictive maintenance helps schedule replacement of equipment parts before errors occur, and can reasonably schedule replacement times, such as during idle periods of the machine, without taking up production time. This not only ensures the efficiency of the production line, but also improves the overall agility of the plant.

Fully automatic high-speed N95 mask production line, including automatic raw material delivery, automatic transportation, cutting nose bridge strips, welding forming, nose bridge filling, ear strap welding, folding, cutting and recycling, and other complete process automation to complete the entire production process from coil raw materials to mask finished products .

As for the development of the industry, the gap with foreign countries, and the problems existing in the industry, we have not paid much attention to it. And it is precisely these problems that are affecting the development direction of this industry.

As the saying goes, there is still a high mountain, so many senior designers will feel that they are just a person who can skillfully operate CAD, not enough to become a master in the eyes of others.

There are two major factors to consider in the law of fluid flow: flow rate and flow rate . Let’s look at each separately.

Several common unfolding formulas for sheet metal.

The so-called chamfer of the bearing, that is, the intersection of the horizontal and vertical surfaces. Due to the production technology limitations, counterfeit bearing products are not handled satisfactorily at these corners. We can easily Identify.

Why can’t the aircraft be welded? Decades of doubt finally understood!