What to pay attention to when purchasing rubber shock absorber
Many users are quite tangled in purchasing rubber shock absorbers. In fact, the main reason is that they do not know enough about rubber shock absorbers and rubber materials. The main reason is that they do not know enough about brands. These three insufficiencies have led many users to buy poor quality shock absorbers or expensive ones. Even if you are happy, you will not buy it, but often this will lead to more serious results. Because rubber shock absorber is very important.
When shopping, you need to pay attention to several shopping items.
1. The rubber shock absorber can not be selected according to the price: I believe that most people like to buy products with low price, and the products with low price may not have good quality. The most important thing for people to purchase products is their application effect, so they must choose products with reliable quality. Don't just think about the price element of the product;
2. We should choose high-quality rubber shock absorbers: fake and counterfeit products are cheap, but their service life is less than half of the original products. In the process of stretching, oil leakage will occur due to poor sealing. If the oil body leaks, it will not play a role in vibration reduction, and will produce a serious sense of stability when driving. What's more, when driving at high speed, it will suddenly fail, causing the car body to tilt, and the safety of people and vehicles will be seriously threatened. Therefore, in order to be safe, we must choose high-quality products;
3. Before purchasing goods, verify the model, displacement and other information of your car to ensure that you can buy the correct model of accessories. As long as the rubber shock absorber is correctly purchased, it can have a strong maintenance effect on mechanical equipment.

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?