Production process of needle roller bearings

Production process of needle roller bearings

1. Needle roller bearings include many varieties, such as one-way needle roller bearings, automotive needle roller bearings, drawn cup needle roller bearings, etc.

2. In the needle roller bearing process, there is a blank forming process. Before that, the bearing needs to be well planned; then the blank is deburred.

3. Processing the rough parts of the needle roller bearing is a very important step in the production process; then coarse, fine, and final grinding of the rotating surface, followed by super-finishing of the rotating surface or sawdust polishing. In this way, the needle bearing is basically formed.

The reason of premature aging of needle roller bearings

1. Too tight fit makes the gap between the ball and the slideway too small, the torque increases, and the conflict increases, so that the working temperature of the bearing is too high. Therefore, the correct bearing radial clearance must be adjusted during installation.

2. Poor lubrication is due to dryness and aging caused by lack of grease. Therefore, according to the running time of the motor, the load condition, the temperature of the situation and the quality of the grease, the time for replenishing the bearing should be determined.

3. The violent vibration is caused by the violent movement of the bearing caused by the malfunction of the motor. When this happens, we need to replace new bearings of the same model.

4. Material fatigue is caused by the fatigue of metal materials, and the debris on the surface of bearing races and balls fall into the grease, which leads to the increase of working noise.

5. Contamination and erosion, check whether there are blood-colored and brown spot erosions on the surface of the raceway and the ball.

Three things to be cared about bearings by heavy truck manufacturers

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]

Classification of solar photovoltaic support system

1、Photovoltaic system on sloping roof

According to the different slope roof substructure, we will provide you with unique accessories specially developed for slope roof photovoltaic system to meet your requirements.

Characteristics of photovoltaic system support on sloping roof:

§ Suitable for tile roof with different thickness and adjustable height accessories, flexible to meet customer application

§ The connection plate and other accessories are designed with multiple openings, which is flexible and effective to realize the support position adjustment

§ No damage to roof self waterproofing system

Flat roof photovoltaic system

2、Common flat roof forms are: concrete flat roof, color steel plate flat roof, steel structure flat roof, ball joint roof, etc.

Features of flat roof photovoltaic system support:

§ Large scale and orderly laying

§ A variety of stable and reliable connections with the foundation

§ According to the different needs of customers to develop unique accessories to meet the requirements

3、Large scale ground photovoltaic system

The common large-scale ground photovoltaic system generally adopts the form of concrete strip (block) Foundation (special foundation conditions need to consult professional soil mechanics designers).

Features of large ground photovoltaic system bracket:

§ Rapid installation and construction schedule of large-scale ground photovoltaic power station

§ The flexible adjustment forms meet the complex and changeable requirements of the construction site

§ Simplify the number of accessories to facilitate on-site workers to identify and install

4、Column solar support

In order to meet the installation requirements of larger size battery modules, and can be used in the area with high wind speed, a ground strengthening structure is designed. The support system can adjust the horizontal angle according to the needs. When installing the system, there is no need for field welding. According to the assembly drawings provided by us, the bolts can be completely installed by placing them in the corresponding bolt holes. Main features: the module area is 12.8 square meters; Completely maintenance free; High reliability and long service life; The power reaches 1.6 kW; No need to move, the system is fixed; Wind resistance ≥ 200 km / h; The price is reasonable.

Decho is a professional supplier of  solar photovoltaic support system, if you need any for your project, pls contact us by e-mail [email protected]

Driving mode of butterfly valve

Butterfly valve is a disc type open and close reciprocating rotary 90 ° Left and right to open, close or regulate the flow of a medium valve

The door. Butterfly valve is not only simple in structure, small in volume, light in weight, low in material consumption, small in installation size, small in driving torque

It is easy and quick to operate, and has good flow regulation function and closing sealing characteristics at the same time. The butterfly valve does not work

Is an automatic valve, its opening and closing need to install transmission device, with manual operation to complete. What are the transmission modes of butterfly valve?

Common butterfly valve transmission methods are: handle, worm gear, electric, pneumatic. Let’s talk about it one by one.

Handle butterfly valve: the handle is installed on the butterfly valve. By pulling the handle, the opening and closing of the butterfly plate can be controlled, and the pulling angle can be adjusted

The degree is 0 ~ 90 °。 Handle butterfly valve is greatly affected by diameter and pressure, and can only be used for pressure ≤ PN16, diameter ≤ PN16

In the pipeline of ≤ DN200. The price of handle butterfly valve is the cheapest among these transmission modes.

Worm gear butterfly valve: a butterfly valve with a wide range of applications. The worm gear head is installed on the butterfly valve and driven by the worm gear

To control the opening and closing of butterfly valve, the worm gear drive controls the opening and closing of butterfly plate by turning the hand wheel and driven by the gearbox gear

Open and close. The worm gear butterfly valve is not limited by the diameter and pressure, as small as DN50, on the pipeline with diameter more than 1m,

Can use worm butterfly valve. Worm gear butterfly valve can also be used in medium and high pressure pipeline.

Electric butterfly valve: the butterfly valve is equipped with an electric actuator. The switch of the butterfly valve is driven by electricity, and the electric butterfly valve is equipped with

It is easy to operate and realize remote control. The opening and closing speed of the electric butterfly valve can be adjusted. The structure is simple and easy to maintain. It can be used to control air, water, steam, various corrosive media, mud, oil and liquid gold

It belongs to the flow of various types of fluid such as radioactive medium and radioactive medium.

Pneumatic butterfly valve: air is inhaled through the pneumatic actuator, and the air is compressed, and then the compressed air is used as the driving force

The force source drives the valve stem to drive the disc-shaped butterfly plate to rotate around the axis of the valve stem, and the rotation angle is 0-90?. When the butterfly plate

Rotate 90 from initial position ° The valve is opened to close or closed to open. Pneumatic butterfly valve actuator is divided into single acting

And double action form, double action for ventilation on, ventilation off! The single acting actuator has the function of spring return,

It can be automatically closed or opened in case of gas or power failure, with high safety factor!

Decho is a professional supplier of butterfly valves, if you need any for your project, pls contact us by e-mail [email protected]

What is double eccentric butterfly valve?

The double eccentric butterfly valve is also called high-performance butterfly valve, which is mainly used for drainage of water works, power plants, steel smelting, chemical industry, water source spring engineering, environmental facilities construction and other systems, especially for waterway pipeline, as regulation and closure equipment. Compared with the center line butterfly valve, the double eccentric butterfly valve has higher pressure resistance, longer service life and better stability.

Working principle: double eccentric butterfly valve is further improved on the basis of single eccentric butterfly valve. The structural feature is that the axis of the valve stem deviates from the center of the butterfly plate and the body. The effect of double eccentricity enables the butterfly plate to break away from the valve seat immediately after the valve is opened, greatly eliminates the unnecessary over extrusion and scratch phenomenon between the butterfly plate and the valve seat, reduces the opening resistance distance, reduces the wear and improves the service life of the valve seat. At the same time, the double eccentric butterfly valve can also use metal seat, which improves the application of butterfly valve in high temperature field.

Structural characteristics:

1. It is reasonable in design, compact in structure, easy to install and dismantle, and easy to maintain.

2. Eccentric structure is adopted to reduce the friction of sealing ring and prolong the service life of valve.

3. Completely sealed, leakage zero. It can be used in ultra high vacuum condition

4. Replace the sealing ring, butterfly plate, rotating shaft and other materials of valve plate, which can be used in various media and different temperatures

Decho is a professional supplier of butterfly valves, if you need any for your project, pls contact us by e-mail [email protected]

Advantages and disadvantages of hydraulic press

Advantages and disadvantages of hydraulic press

(1) Advantages

For the hollow structure with variable cross-section, the traditional manufacturing process is stamping two half pieces first, and then welding them as a whole, while hydroforming can form the hollow structure with variable cross-section at one time. Compared with stamping and welding process, hydroforming technology has the following advantages

1. Reduce quality and save materials. For typical parts such as engine bracket and radiator bracket, hydroforming parts are 20% – 40% less than stamping parts; For hollow stepped shaft parts, the weight can be reduced by 40% ~ 50%.

2. Reduce the number of parts and mold, reduce mold costs. Hydroforming parts usually need only one set of dies, while stamping parts mostly need multiple sets of dies. The number of hydroforming engine bracket parts is reduced from 6 to 1, and the number of radiator bracket parts is reduced from 17 to 10.

3. It can reduce the welding amount of subsequent machining and assembly. Taking the radiator bracket as an example, the heat dissipation area increased by 43%, the number of solder joints decreased from 174 to 20, the number of processes decreased from 13 to 6, and the productivity increased by 66%.

4. Improve the strength and stiffness, especially the fatigue strength. For example, the stiffness of hydroforming radiator bracket can be increased by 39% in the vertical direction and 50% in the horizontal direction.

5. Reduce production cost. According to the statistical analysis of the applied hydroforming parts, the production cost of hydroforming parts is reduced by 15% ~ 20% than that of stamping parts, and the die cost is reduced by 20% ~ 30%.

(2) Disadvantages

1) The manufacturing accuracy of hydraulic components is required to be high. Due to the high technical requirements and difficult assembly, the use and maintenance of hydraulic components are relatively strict.

2) It is difficult to realize constant ratio transmission. Hydraulic transmission uses hydraulic oil as working medium, so it is inevitable to have leakage between relative moving surfaces. At the same time, the oil is not absolutely incompressible. Therefore, it is not suitable to be used in the occasions with strict transmission ratio requirements, such as the transmission system of thread and gear processing machine tools.

3) Due to the influence of temperature, the viscosity of oil changes with the change of temperature, so it is not suitable to work in high or low temperature environment.

4) It is not suitable for long-distance transmission of power. Because the pressure oil is transmitted by tubing, the pressure loss is large, so it is not suitable for long-distance transmission of power.

5) When air is mixed in the oil, it is easy to affect the working performance. When air is mixed in the oil, it is easy to cause crawling, vibration and noise, which will affect the working performance of the system.

6) The oil is easy to pollute, which will affect the reliability of the system.

7) It is not easy to check and remove the fault.

Decho is a professional supplier on hydraulic components ,if you have any request,pls do not hesitate to contact us by email [email protected]

Key points of selection of common hydraulic valves

Key points of selection of common hydraulic valves

The selection of proper hydraulic valve is an important condition to make the design of hydraulic system reasonable, the technical and economic performance excellent, the installation and maintenance simple, and to ensure the normal operation of the system. Because the selection of hydraulic valve is very important to the success of the system, it must be taken seriously.

General principles of type selection

① According to the drag and control function requirements of the system, the function and variety of the hydraulic valve are reasonably selected, and a complete hydraulic circuit and system schematic diagram are formed together with the hydraulic pump, actuator and hydraulic accessories.

② The existing standard shaped series products are preferred, unless it is necessary to design the special hydraulic control valve.

③ According to the working pressure and flow (working flow) of the system, and considering the type of valve, installation and connection mode, operation mode, working medium, size and quality, working life, economy, adaptability and maintenance convenience, source of goods and product history, it is selected from relevant design manuals or product samples.

Type selection of hydraulic valve

The performance requirements of hydraulic system are different, so are the performance requirements of the selected hydraulic valves, and many performances are affected by the structural characteristics. For example, for the system with fast reversing speed, AC electromagnetic reversing valve is generally selected; On the contrary, for the system with slow commutation speed, DC electromagnetic directional valve can be selected; For example, in the hydraulic system, the requirements for valve core reset and neutral energy are particularly strict, and the medium-sized hydraulic structure can be selected; If the hydraulic control check valve is used, and the back pressure of reverse oil outlet is high, but the control pressure cannot be raised very high, the leakage type or pilot type structure should be selected; For the pressure valve to protect the safety of the system, it is required to be sensitive and the pressure overshoot is small, so as to avoid the large impact pressure and absorb the impact of the reversing valve, so the components that can meet the above performance requirements must be selected; If the general flow valve can not meet the accuracy requirements of actuator movement due to the change of pressure or temperature, the speed control valve with pressure compensation device or temperature compensation device should be selected

Selection of nominal pressure and rated flow

(1) Selection of nominal pressure (rated pressure)

The hydraulic valve of corresponding pressure level can be selected according to the working pressure determined in the system design, and the working pressure of the system should be properly lower than the nominal pressure value indicated on the product. High pressure series of hydraulic valves are generally applicable to all working pressure ranges below the rated pressure. However, some technical indexes of high-pressure hydraulic components under rated pressure will be different under different working pressure, and some indexes will become better. If the actual working pressure of the hydraulic system is slightly higher than the rated pressure value indicated by the hydraulic valve in a short period of time, it is generally allowed. But it is not allowed to work in this state for a long time, otherwise it will affect the normal life and some performance indexes of the product.

(2) Selection of rated flow

The rated flow of each hydraulic control valve should be close to its working flow, which is the most economical and reasonable match. The valve can also be used under the condition of short-term over flow, but if the valve works under the condition of long-term working flow greater than the rated flow, it is easy to cause hydraulic clamping and hydrodynamic force, and have adverse effects on the working quality of the valve.

In a hydraulic system, the flow of each oil circuit can not be the same, so the flow parameters of the valve can not be selected simply according to the maximum output flow of the hydraulic source, but should consider the maximum flow of each valve in all design states of the hydraulic system, for example, the flow of each oil circuit in series is equal; The flow of parallel oil circuit working at the same time is equal to the sum of the flow of each oil circuit; For the directional valve of differential hydraulic cylinder, its flow selection should take into account that when the hydraulic cylinder changes direction, the flow discharged from the non rod chamber is much larger than that discharged from the rod chamber, and may even be larger than the maximum flow output from the hydraulic pump; For the sequence valve and pressure reducing valve in the system, the working flow should not be far less than the rated flow, otherwise it is easy to produce vibration or other instability; For throttle valve and governor valve, the minimum steady flow should be paid attention to.

Decho is a professional supplier on hydraulic components ,if you have any request,pls do not hesitate to contact us by email [email protected]

What should be paid attention to when welding lifting rings?

What should be paid attention to when welding lifting rings?

Welding rings in production, its welding is a very important operation, is a test of human technology process.

Matters needing attention in the welding of welding rings:

1. The welded structure can be annealed at a temperature of less than 600 ℃ for stress relief without reducing the working load.

2. Do not cool the welding point quickly.

3. Please check the welding points one by one, without any cracks, dents or scratches. If in doubt, use non-destructive testing methods such as magnetic particle or liquid penetrant testing.

4. If repair is needed, grind the defect clean and carry out qualified welding again.

Attention should be paid to welding materials: according to the electrode manufacturer’s recommendations, welding materials must have tensile strength higher than 70000psi (such as awsa5.1 e-7018). For inert gas shielding metal electricity

The diameter of welding rod is 0.8-1.2mm, according to DIN 8559-sg 3. AWS a 5.18. One of the important points to be reminded is not to weld in open space or in bad weather.

Welding rings of welding temperature influence matters needing attention, need your careful and responsible operation, in order to avoid those trivial trouble, we should pay attention to it.

Decho is a professional supplier on rings and riggings,if you have any request,pls do not hesitate to contact us by email [email protected]

Common materials of rings and riggings

Common materials of rings and riggings

Based on the proper consideration of the use of rings, of course, it is better to choose high quality materials. Therefore, both manufacturers and users attach great importance to this issue. Kosobi is

Professional manufacturers, a variety of non-standard specifications can produce, long screw use

It does not affect the bearing tonnage, and the material used is high-quality alloy steel. The quality of the rings produced is undoubtedly high.

The material and technology of universal rings are comparable with those of foreign brands. The service life depends on what kind of environment you use and how long you use them

Appropriate, not in a humid environment, no load use, as long as you use the correct storage method

Also appropriate, then do not worry about the quality of the rings, durable that is for sure. Tianjin cosobi’s universal rings can rotate 360 degrees and flip 180 degrees, with complete specifications, a large number of goods and high quality

Said, commonly used alloy steel material rings, let you use will be more stable.

Decho is a professional supplier on rings and riggings,if you have any request,pls do not hesitate to contact us by email [email protected]

Classification of hydraulic valves

Classification of hydraulic valves

According to different classification methods, hydraulic valves are divided into many kinds:

1、According to the control method: manual, electric control, hydraulic control, proportional

2、According to function: flow valve (throttle valve, speed control valve, shunt valve), pressure valve (relief valve, pressure reducing valve, sequence valve, unloading valve), directional valve (electromagnetic directional valve, manual directional valve, one-way valve, hydraulic control one-way valve)

3、According to the installation method: plate valve, pipe valve, Superposition valve, screw cartridge valve, cover valve

Decho is a professional supplier on  hydraulic valves , if you have any request , pls donot hesitate to contact us by email [email protected]