How to make pneumatic ball valve balls with high requirements for surface roughness and geometric accuracy on an ordinary lathe? Finishing is required after finishing. At present, for the final finishing of large diameter ball, our factory usually uses the abrasive belt grinding process on the special ball turning machine tool. Due to the limitation of the structure of the belt grinding device, the final finishing of small diameter spheres is generally done by hand grinding, but this process method often fails to meet the needs of practical use in terms of efficiency and quality. For this reason, we have designed a device for honing ball on C620 ordinary lathe, and the effect is good through verification.

Metal bellows forming record (II)
The bellows hydroforming die is composed of a mandrel, a pair of push dies and a pair of die pieces. The sectional shape of their working parts changes accordingly to the sectional shape of bellows, and the data should be made of carbon steel or ordinary alloy steel. The requirements for strength, hardness and toughness can be the same as those for common mold design specifications.
The procedure is as follows:
1、 Move the push die and the die sheet vertically parallel to the axis line of the tube blank at the same time, and tightly wrap the thin-walled tube blank installed on the mandrel from the surface.
2、 The mandrel moves against the friction resistance between the seal ring and the inner wall of the tube blank, so that the seal ring fixed on the mandrel moves relative to the die sheet to the preset position.
3、 The working fluid of filling pressure liquid flows from the central hole of the mandrel to between the two sealing rings and acts on the inner wall of the tube blank. Under the action of liquid pressure, the tube blank between the two sealing rings bulges, forming an initial wave.
4、 The pushing mold resists the resistance and moves along the guide slide bar to increase the height of the original initial wave and reduce the width until the design size.
5、 Hydraulic pressure relief;
6、 The separating mandrel and the pushing die detach the once formed bellows from the die; At the same time, it is also ready for the forming of the next wave. This cycle. It takes about 4~40 seconds to form a ripple. The larger the drift diameter, the longer the forming time. Hebei Changli earthquake, your pneumatic butterfly valve to force it?