In March 1992, at the First Measurement and Testing Research Center of the Beijing National Defense Science and Technology Commission, the Foreign Instrument Application Technology Committee of the China Metrology and Testing Society organized a seminar on the application, maintenance and softw…

The caliper measurement after threading is usually measured by a threaded micrometer or a three-needle, which is often limited by conditions. If it is measured with a thread micrometer, it needs to be measured according to the different pitch of the corresponding measuring claw. With the three…

Automobile brake discs (Fig. 1) are important parts of automobile brakes. They have strict requirements on dimensional tolerances, shape tolerances, balance accuracy, surface roughness, etc., and the brake discs have various specifications but similar dimensions. When processing this kind of p…

â– Cylinders of diesel engines â– There are high requirements for valve sealing. â– Generally use the “kerosene leakage method” to detect: After the cylinder head parts are assembled, pour the appropriate amount of kerosene into the air vents and observe the inlet and e…

The hydraulic cylinder part structure of the GJ2C5-45 type leather shaving machine produced by our factory (Fig. 1), when the front cover 6 is installed, the piston rod 3 is to pass through the Y-shaped sealing ring 4. The lip size of the Y-ring 4 is smaller than the radial dimension of the pi…

Welding Manual, 2nd Edition, Volume 1-3, Volume 1 Welding methods and equipment are divided into 6 chapters and 41 chapters. The characteristics are the welding process and equipment, and the principle is closely related to the process (or equipment). The purpose is to guide the reader to the c…

Teflon is commonly used as a gasket, guide ring, sleeve and seal assembly in high voltage electrical appliances. Because of its special molecular structure, the fluorine atom is more electronegative, and the CF bond energy is large. The viscosity of the molten state is as high as 10~(11)~10~(1…

1. Structural design of small-diameter drill bit We usually refer to the small-diameter drill bit, which generally refers to a drill bit of φ1 to φ3 mm. The structural shape of the small diameter drill bit is the same as that of the standard large diameter drill bit, both of which are …

Our factory processes a number of flanges at both ends of the cast iron pipe (as shown in Figure 1). According to the usual processing steps, a center frame is required, so that it has to be double-mounted, which is time-consuming and labor-intensive, and cannot guarantee accuracy. Claim. To t…

Introduce plasma-based low-energy nitrogen ion implantation, ie low-temperature and low-pressure modification technology of plasma source ion nitriding austenitic stainless steel. Plasma source ion nitriding 1Cr18Ni9Ti, AISI316 stainless steel has a wear-resistant corrosion composite modificati…

I first met "Mechanical Worker" in the early 1980s. At that time, I just entered the workshop and my master booked a "Mechanical Worker" (cold processing). At that time, "Mechanical Worker" was still a 32-page booklet. . Whenever there is time, the master loves to…

When the factory produces the straight-toothed bevel gears, the A and B faces (Fig. 1) are the benchmarks for processing, inspection and assembly. The internal splines have radial runout (0.08~0.15mm) requirements relative to the B surface. The mandrel is clamped and the reference faces A and …