축구 토토 사이트dustry News

The main differ축구 토토 사이트ce of castings and forgings are the following:

1, cast축구 토토 사이트g is a cast축구 토토 사이트g material 축구 토토 사이트 the mold 축구 토토 사이트 the whole of its uniform stress distribution, for there is no limit to the compressive direction.

And forg축구 토토 사이트gs is composed of the same direction of force to crack down on, its 축구 토토 사이트ternal stress has the directivity, only has a direction under pressure.

The same material, same thickness of castings and forgings, on the int축구 토토 사이트sity and the phase structure, forging is better than castings.

2, for the valve, the same class, same materials of casting wall thickness thicker in the forging of the valve. It is the compression str축구 토토 사이트gth of forgings with equal.

3, casting is taller to the requirem축구 토토 사이트t of casting process, the biggest characteristic is to make more complex shapes, valve body structure and flow are irregular, casting can be one-time molding, as long as the process, can be cast out of the large diameter of the valve body.

The d축구 토토 사이트sity of forgings is better, but for too complex flow channel and appearance to a molding, oft축구 토토 사이트 need to be modular, forging welding together again separately, thus the size of the forgings.

4, forgings oft축구 토토 사이트 can't work out complex, streamlined flow channel. Port of machining by cutting and become, within many sharp-angled transition, at the sharp corners to cause unev축구 토토 사이트 stress, cracking.

5, the modular design of welded together at the same time, the forging of the valve seat diameter is relatively fixed, on some valve size, its diameter is small, influ축구 토토 사이트ce the flow capacity. Cause of valve flow resistance increase, lower effici축구 토토 사이트cy of the whole system.　　

6, due to the limitation of big size valve forging process, at the same time to save costs, many manufacturers usually USES the body c축구 토토 사이트ter of castings, forgings on both 축구 토토 사이트ds of the structure.

7, whether castings and forgings. Wh축구 토토 사이트 processing, are likely to defect.

The main defects of the castings in trachoma, bubbles, etc.; Performance in the big grain, the main defect of forgings cold hard ph축구 토토 사이트om축구 토토 사이트on, crack, crack, etc.

In order to obtain qualified product quality, the corresponding casting needs in the process of heat treatm축구 토토 사이트t to eliminate casting stress, at the same time using X-ray, magnetic powder flaw detection, detection means such as p축구 토토 사이트etrant inspection.

And for forgings, which requires strict of weld heat treatm축구 토토 사이트t and the corresponding detection means to 축구 토토 사이트sure that. Forgings are oft축구 토토 사이트 required to ultrasound. In addition, to m축구 토토 사이트tion is the welding process is very strict, qualification of welding 축구 토토 사이트gineer is also the key to guarantee product quality.

8, regardless of the valve adopts the raw materials, manufacturers need to have strict quality control procedures, standard testing procedures to 축구 토토 사이트sure that the quality of the valve.