The difference between powder press thread and flat bottom-imported internal thread high pressure ball valve

The difference between powder press thread and flat bottom-imported internal thread high pressure ball valve

The essence of coffee can not be extracted, or some parts are over-extracted. In other words, the main purpose is to flatten and tamp the coffee powder in the handle to form a flat horizontal plane, to better let the hot water be extracted through the coffee powder, and to enable the coffee powder to withstand the tremendous pressure caused by the coffee machine extraction. without being washed away and affecting the quality of the extraction. The force of the pressing powder should be determined according to the grinding thickness of the coffee powder, and the reference basis is the flow rate of coffee during extraction (extraction time 25 ±5 seconds). If the flow rate is too fast, the powder pressing strength is too light; if the flow rate is too slow, the powder pressure is too heavy, which will directly affect the Italian concentrated product and the taste of the coffee.

The metal fiber of the thread part is not cut off, but deforms along the tooth profile, and the material of the rolled metal material is relatively dense, so the wear resistance of the parts is greatly improved after rolling, and the fatigue strength of the thread is also greatly improved. In the rolling process, the part material and the tool continuously slide relative to each other, so that the surface of the machined thread reaches or exceeds the roughness of grinding. High surface quality can improve the cyclic strength of thread.

When rolling the thread, the thread formation process is the metal plastic deformation process, which will produce slip, shear deformation, double crystal and other phenomena in the metal grain. The thread rolling method is a kind of plastic processing technology, which has obvious advantages compared with the traditional turning thread method. The thread rolling method is a kind of plastic processing technology, which makes the plastic displacement of the metal volume without destroying the metal fiber. to achieve chip-free metal forming. It can not only improve the mechanical properties of thread, but also save metal materials.

Difference: rolling thread is high finish, high strength, high precision; cutting thread will cut metal, the precision is low. In addition, the rolling speed can be more than twice that of the ordinary tap, the efficiency is very high, it belongs to chip-free machining, it is easy to realize automatic and unmanned management, and the thread strength of the thread rolling machine is high and the cutting thread strength is low.