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Fasteners are the most common components in mechanical equipment and play a crucial role. However, corrosion is the most common form of damage to fasteners during use. In order to prevent corrosion during use, we will perform surface treatment on fasteners after production. So, what surface treatment methods can improve fasteners to prevent corrosion? There are four main surface treatment methods to prevent corrosion of fasteners, and we can choose the most suitable method according to specific needs:

Our fastener products include: internal locking wire drawing rivets, external locking wire drawing rivets, seahorse rivets, double drum rivets, single drum rivets, lantern rivets, open type rivets, flower rivets, groove core pulling rivets, closed type rivets, rivet nuts, pneumatic riveting guns and related fasteners.

1、 Electroplating

Electroplating standard parts involves placing them in a metal solution and then applying an electric current to cover the surface of the standard parts with a layer of metal. There are many effects on this layer of metal, for example, we can choose different coating metals based on their different effects. If we want to prevent rust on the standard parts, we can electroplate zinc on the surface of the standard parts.

2、 Mechanical plating

Mechanical plating on standard parts is to allow metal particles to perform cold welding on the standard parts, ensuring some of the surface effects of the standard parts. Mechanical plating and electroplating are basically similar, but the methods we use are different, and the results can be said to be the same.

3、 Heat treatment

For standard parts, heat treatment is required on the surface. Some standard parts, such as drill tail screws, require a relatively hard surface, so drill tail screws can be heat treated to ensure that they have sufficient hardness. This is the reason for conducting heat treatment.

4、 Surface passivation

For the surface passivation of standard parts, passivation has two main functions: one is to enhance the hardness of the standard parts, and the other is to greatly reduce the oxidation effect of the standard parts. When conducting surface treatment processes for fasteners, we can choose the most suitable method based on specific circumstances and requirements. This way, fasteners can play a better role during use.

If you need any fasteners , pls do not hesitate to contact us by email : [email protected]

Although aluminum screws are less used than screws made of other materials, aluminum screws also have a market demand. Today we will talk about the characteristics and application fields of aluminum screws.

The proportion of aluminum screw is only one third of that of iron. It is a metal material with extremely light weight and good conductivity, thermal conductivity and ductility. In addition, aluminum alloy can obtain the same hardness as steel, so it can be used when both high strength and light weight are required. Although aluminum screw is far from being popularized, it has unique properties in aviation, medical and other related fields, It is used more and more widely. Next, we will introduce several representative aluminum alloys for screw production. It should be noted that model x refers to the model in JIS.

1. Aluminum copper alloy screw [Model 2000]

After heat treatment, aluminum copper alloy is an alloy with superior strength and hardness, including A2017 (hard aluminum) and a2024 (super hard aluminum) with higher hardness. Because it contains copper, it has poor corrosion resistance.

2. Aluminum magnesium alloy screw [model 5000]

Aluminum magnesium alloy is the aluminum alloy with the best corrosion resistance and good processability. Although it has medium strength, it has a good balance of mechanical properties. Therefore, it is a widely used aluminum alloy. Representative models include a5005 and a5052

3. Aluminum magnesium zinc alloy screw [model 7000]

Aluminum magnesium zinc alloy is one of the strongest aluminum alloys, among which A7075 [superhard aluminum] is used in aircraft manufacturing and other fields. However, the corrosion resistance of this series of aluminum alloys is poor.

The tensile strength of SS400, a representative steel in aluminum screws, is 400MPa. Among aluminum alloys, A2017, a2024, A7075, etc. are harder than SS400, while aluminum alloy a5052 with the best corrosion resistance is slightly inferior in strength.

Although the utilization rate of aluminum screws is not as high as that of other materials, it is undeniable that aluminum screws have certain advantages in performance. When choosing the screw material, we can choose the screw material according to the actual use needs. If you have any questions or want to know more about aluminum screws, please contact us by email [email protected] or call us by 0086 18920150762

In the supermarket, we often see a tool – shopping cart. Shopping cart is the most common tool in the supermarket. Its existence is to help people easily load and move items in the shopping process. Its most important part is the caster at the bottom. It can be said that the caster of shopping cart is the core part of the whole shopping cart. If it is less, it will lose the labor-saving effect. Heavy loads, high barriers, and the great differences between the cold storage area and the store counter all put forward high requirements for shopping cart casters.

The flexible movement of shopping cart is due to the installation of casters, which include fixed casters and movable casters. Among them, the movable caster is also known as the universal wheel. Its remarkable feature is that it can rotate 360 degrees horizontally and drive in any direction. The flexibility of universal wheel is inseparable from its structure, so what parts does it consist of?

① Single wheel: a single wheel is a wheel

② Movable support assembly: the movable support assembly is composed of movable support, axle, nut, screw or inserting rod, excluding wheel, inner wheel bearing and shaft sleeve.

③ Shaft sleeve: the shaft sleeve is a non rotating part made of steel sleeved outside the axle, which is used for the wheel bearing to rotate and fix the wheel in the support, and the shaft sleeve needs to be equipped with a rotating shaft.

④ Rotating bearing:

A. Single layer bearing: there is only one layer of steel ball on the large track, commonly known as single row ball bearing;

B. Double layer bearing: also known as double row ball bearing, it has double-layer steel balls on two different tracks;

C. Economical bearing: it is composed of steel ball supported by upper ball plate formed by stamping;

D. Precision bearing: it is composed of standard industrial bearing.

⑤ Center rivet:

The center rivet is an integral part of the base plate and is used to fix the bolts or rivets of the rotating device. Tightening the bolt type rivets can adjust the looseness of the universal wheel caused by rotational wear.

With the development of modern commerce, there are more and more kinds of goods. Usually when people need to buy many kinds of goods, people tend to choose to go to large supermarkets with a wide range of goods, such as Carrefour, Wal Mart, RT mart and so on. These large supermarkets are basically equipped with shopping carts, because shopping carts are flexible and can provide great convenience for customers to carry goods. Therefore, the selection of shopping cart casters is particularly important, because it can directly affect the service life of shopping cart.

Decho is a professional supplier on Casters for Shopping Cart . If you need any for your supermarket applications, pls feel free to contact us by email [email protected]

Process flow of making elbow

Seamless elbow: an elbow is a pipe fitting used at the turn of a pipe. The proportion of all pipe fittings used in the pipeline system is large, about 80%. Generally, different forming processes are selected for elbows with different materials or wall thickness. The common forming processes of seamless elbow in manufacturers include hot pushing, stamping, extrusion and so on.

Hot push forming

The hot push elbow forming process is a process of heating, expanding and bending the blank sleeved on the die under the push of the special elbow pushing machine, core die and heating device. The deformation characteristic of the hot push elbow is to determine the diameter of the pipe blank according to the law that the volume remains unchanged before and after the plastic deformation of the metal material. The diameter of the pipe blank used is less than the diameter of the elbow. The deformation process of the blank is controlled through the core die to make the compressed metal flow at the inner arc and compensate to other parts thinned due to diameter expansion, so as to obtain the elbow with uniform wall thickness.

The forming process of hot push elbow has the characteristics of beautiful appearance, uniform wall thickness and continuous operation, which is suitable for mass production. Therefore, it has become the main forming method of carbon steel and alloy steel elbow, and is also used in the forming of some specifications of stainless steel elbow.

The heating methods of the forming process include medium frequency or high frequency induction heating (the heating ring can be multi circle or single circle), flame heating and reverberatory furnace heating. The heating method depends on the requirements of the formed products and energy conditions.

Stamping forming

Stamping formed elbows have long been used in the forming process of mass production of seamless elbows. They have been replaced by hot pushing method or other forming processes in the production of common specifications of elbows. However, in some specifications of elbows, the production quantity is small, the wall thickness is too thick or too thin.

The product is still in use when there are special requirements. The pipe blank with the same outer diameter of the elbow is used for the stamping forming of the elbow, and the press is used to directly press and form in the die.

Before stamping, the tube blank is placed on the lower die, the inner core and end die are installed into the tube blank, the upper die moves downward and begins to press, and the elbow is formed through the restraint of the outer die and the support of the inner die.

Compared with the hot pushing process, the appearance quality of stamping forming is not as good as the former; When the stamping elbow is formed, the outer arc is in the tensile state, and there is no excess metal in other parts to compensate, so the wall thickness at the outer arc is reduced by about 10%. However, due to the characteristics of single piece production and low cost, the stamping elbow process is mostly used for the manufacture of small batch and thick wall elbows.

Stamping elbows are divided into cold stamping and hot stamping. Cold stamping or hot stamping is usually selected according to the material properties and equipment capacity.

The forming process of cold extrusion elbow is to use a special elbow forming machine to put the pipe blank into the outer die. After the upper and lower dies are closed, the pipe blank moves along the gap reserved by the inner die and the outer die under the push of the push rod to complete the forming process.

The elbow manufactured by internal and external die cold extrusion process has beautiful appearance, uniform wall thickness and small size deviation. Therefore, this process is often used for the forming of stainless steel elbow, especially thin-walled stainless steel elbow. The precision of internal and external die used in this process is high; The requirements for wall thickness deviation of pipe blank are also strict.

Medium plate welding

Use the medium plate to make half of the elbow section with a press, and then weld the two sections together. This process is generally used for elbows above DN700.

Other forming methods

In addition to the above three common forming processes, seamless elbow forming also adopts the forming process of extruding the tube blank to the outer die and then shaping through the ball in the tube blank. However, this process is relatively complex, troublesome to operate, and the forming quality is not as good as the above process, so it is rarely used.

Whether lifting a boom or moving heavy objects, earth-moving trucks rely on bearings. Choosing the right bearing means: longer service life for heavy-duty truck mobile applications, the potential for maintenance-free bearings, and the ability to withstand stronger static and dynamic loads. 　　

Some people may argue that all bearings are the same. However, there are not only differences in quality and design, but also differences in capabilities. Choosing bearings from the right manufacturer will alleviate many performance issues. Product engineers working in the construction industry know that the following attributes are key success factors. 　　

Internal bearing expert. The difference between a bearing manufacturer and a bearing distributor is the depth of knowledge. Many distributors are good at finding standard bearing options for specific applications. Manufacturers go one step further by presenting a full range of options, building custom solutions, and connecting their engineering departments with OEM design teams. 　　

Able to respond quickly to design improvements. In the construction industry, design flaws can have dire consequences for the personnel operating the equipment. OEMs need a partner who can find a solution in a tight time, especially when the machine encounters problems in the field. 　　

Innovative product line. Manufacturers that produce a full range of bearings, bushings and supporting motion control components (such as rod ends and pendulum rods) are investing heavily in research and development. Construction OEMs can evaluate the innovation of manufacturers through the following capabilities: 　　

bearing assembly-when the manufacturer can provide bearings of the same quality level, it will reduce the overall cost and simplify the supplier. For example, we produces many bearing components, including tie rods and rod-end linkages for heavy-duty truck suspension systems. 　　

Cross-border products-a factory that provides bearings for power-using industries such as agriculture, mining and material handling, and found solutions in applications similar to the construction industry. Just like the grease-free ball joints that we Bearing Company is developing for tractors. They make the product maintenance-free while being able to handle heavier loads. 　　

Patented bearings-the true symbol of innovation is patents. The square ball universal joint is a U-shaped joint composed of a square ball and seven other parts. Since it has fewer parts than more than 100 components of the traditional u-joint, it has a smoother rotating torque and has a cost advantage in most cases. 　　

Construction OEM relies on the safety and reliability of motion control. Choosing the right bearing from a reliable partner is the first step in designing a heavy-duty truck that runs at an ideal level in harsh working environments.

Decho can provide you all kinds of bearings , if you need any , pls feel free to contact us by email [email protected]