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The application of stainless steel screws has been widely used in our daily life, but for the common problems of stainless steel screws, many still have some understanding, for example, the fracture of stainless steel screws, the locking of stainless steel screws, the blackening of stainless steel screws and so on. According to the specific understanding of China standard parts network, it summarizes some common problems of stainless steel screws and corresponding solutions, so that we can have a more comprehensive understanding of stainless steel screws.
1、 Blackening of stainless steel screws
Reasons for blackening of stainless steel screws:
The blackening of stainless steel screws is usually caused by the high heat generated during cold heading or rolling. It usually occurs in the cross groove part. In the process of production, the heat can be dispersed in time through the supply of lubricating oil, and the speed of the machine can be properly reduced to avoid problems. Of course, in addition to technical reasons, the blackening of stainless steel screws may also be caused by the material problems of stainless steel screws themselves.
Technological process of solution for blackening stainless steel screws
Degreasing - water passing - Cross tank cleaner - water passing - neutralization - water passing - drying; heat the stainless steel screw cross tank cleaner to 70 degrees, and then put the degreased stainless steel screw product into the cross tank cleaner, soak for 5-15 minutes, and then rinse, neutralize and dry.
2、 Anti loosening of stainless steel screws
The main reasons for the loosening of stainless steel screws are as follows:
Spontaneous bolt loosening - impact, vibration, dynamic load
Relaxation settlement, creep, relaxation
In order to prevent spontaneous loosening, it is necessary to eliminate sliding between connecting parts, or at least reduce to below critical level. This can be achieved by increasing the axial tension, increasing the friction between the clamping parts or reducing the cyclic load - for example, shock, vibration or cyclic heat load.
Stainless steel screw anti loose solution:
The first one is to use the rebound property of special materials, such as engineering resin materials, which have better rebound property. Attach it to the stainless steel screw thread. Make it friction with nut or material product mechanically. Generate vibration and absolute resistance. Completely solve the problem of loose screws.
The second is simply to apply a layer of glue on the stainless steel screw thread, so-called dispensing. This kind of glue is called drop resistant. This kind of adhesive has good properties such as high adhesiveness and non toxicity. This adhesive is applied to stainless steel screws. After drying, the adhesive force is very strong. It can make the stainless steel screw thread join in the nut thread, or join in the product thread hole, produce the super factor fastening effect. It has an excellent anti loosening effect.
3、 Corrosion and rusting of stainless steel screws
Common factors of corrosion and rust of stainless steel screws:
1. In humid air, the attachment of dust or dissimilar metal particles and the condensate of stainless steel screws form a micro battery, which leads to electrochemical reaction and damages the protective film, which is called electrochemical corrosion.
2. The surface of stainless steel screw adheres to organic matter juice (such as melon, vegetable, noodle soup, phlegm, etc.), which forms organic acid under the condition of water and oxygen, and the organic acid corrodes the metal surface for a long time.
3. There are acid, alkali and salt substances on the surface of stainless steel (such as alkali water and lime water splashing on the decoration wall), causing local corrosion.
4. In the polluted air (such as the atmosphere containing a large number of sulfides, carbon oxides and nitrogen oxides), when encountering condensed water, sulfuric acid, nitric acid and acetic acid liquid point will be formed, causing chemical corrosion.
Solution for stainless steel screws after corrosion and rusting:
1. It is necessary to clean and scrub the surface of decorative stainless steel frequently to remove the attachments and external factors that cause the decoration.
2. 316 stainless steel should be used in coastal areas, which can resist seawater corrosion.
3. The chemical composition of some stainless steel pipes on the market can not meet the corresponding national standards, and can not meet the requirements of 304 material. Therefore, it will also cause rust, which requires users to carefully select products from reputable manufacturers.
Rust on the surface of stainless steel screw will not only affect the appearance, but also affect the performance of the product itself to a certain extent. Therefore, when using stainless steel screws, attention should also be paid to maintenance to prevent early rust corrosion. Specifically, you can also handle according to the methods described above. More knowledge of mechanical parts will be provided for you in the future.
4、 Fracture of stainless steel screw
Fracture reason of stainless steel screw:
Sometimes, we often see the iron screw broken, and sometimes, we also see the stainless steel screw broken. But generally speaking, stainless steel screws are rarely broken. Because the stainless steel screw wire is relatively hard. But under certain circumstances, stainless steel screws will break. So what are the main reasons for the fracture of stainless steel screws!
The reasons for the fracture of stainless steel screws are as follows:
1. The quality of raw materials used for stainless steel screws is poor, and the quality of stainless steel screw wires is not good. There are many impurities, impure, resulting in the stainless steel screw hardness is not enough.
2. Production of stainless steel screw process. For example, the stainless steel screw with eccentric eccentric head, the Q value is too deep and the R position design is too small during undercutting operation during production and manufacturing.
3. When using stainless steel screws, the customer uses too much force. Generally you do the torque test to see how much the minimum breaking force is, and then adjust the torque.
To prevent stainless steel screws from breaking:
1. Plug and pad iron;
2. Improve screw processing technology;
3. Improve the standard section processing technology.
5、 Locking of stainless steel screws
The reason of stainless steel screw locking
1、 The deflection angle of thread fit and the soft property of stainless steel are easy to cause the locking of stainless steel screws
1. The fit of stainless steel screw and stainless steel nut belongs to clearance fit, and they have their own international standard tolerance range, so the internal and external screws