2018 - 07 - 24
(5) the development of spring steel wireAfter more than 100 years of development, the technology of spring steel has experienced lead hardened to oil quenching, and now it develops to induction hardening. Coupled with the continuous innovation and improvement of technology and equipment, the quality of varieties is constantly updated. The newly developed valves have been developed by induction heating and tempering with spring steel wire. It has been proved that the plastic, toughness, relaxation, fracture toughness, delayed fracture resistance, fatigue life and so on are all compared with oil...
2018 - 08 - 03
Spring is no stranger to everyone. This element is seen everywhere in life. It is also one of the important parts of many industrial machinery equipment. There are many kinds, with different forms, specifications and sizes, and are widely used in the field. Now the spring plant is basically able to produce a variety of different springs. This component is made with special steel. The structure is relatively simple, but it is also required for the production process, so the manufacturer's production equipment and technology will affect the finished product.So if you need to choose a better bran...
2018 - 08 - 16
7. Detection of the characteristics of cylindrical helical spring7.1 detection of the characteristics of tension and compression springsThe characteristics of the characteristic tensile and compression springs of the 7.1.1 spring should be in accordance with the characteristics of the spring. Under the load of the specified height (or length), the deformation of the spring should be between the 20%~80% of the deformation amount under the test load, and when the I class precision is required, the deformation of the spring should be above 4mm at the specified height load. It should be between 30...
2018 - 08 - 31
Spring drawings should be audited as follows: geometric parameters audit; physical parameters audit; technical conditions audit.(1) geometric parameters include material size, spring diameter, spring coil number, free height, spring rotation and so on.(2) physical parameters include load, stiffness, theoretical value of deformation, tolerance and so on.(3) Technical conditions include geometric tolerance, heat treatment process requirements, surface treatment, elastic compression treatment and shot peening treatment.
2018 - 09 - 13
The surface of steel is hardenedIn some parts, the surface layer of the workpiece bears higher stress than the core under the action of alternating loads such as torsion and bending and impact loads.In the case of friction, the surface layer is also constantly worn. Therefore, high strength, high hardness, high wear resistance and high fatigue limit are put forward for some surface layer of parts. Only surface strengthening can meet the above requirements.Because surface quenching has the advantages of small deformation and high productivity, it is widely used in production.According to differ...
2018 - 09 - 25
Torsion spring is a mechanical force storage structure, mainly used in ancient crossbow guns and other crossbow.The torsion spring accumulates the force through the twist or rotation of the elastic material with a relatively soft and pliable material, and makes use of it so that the projectile has certain mechanical energy.The modern torsion spring torsion bar is made of excellent elastic steel, and the form is also changed a lot, including the wire on the inner surface of the mechanical watch, the power spring in the toy gyroscope gun, as well as the torsion bar in the tank and car.Small...
2018 - 10 - 10
In recent years, the surface of the spring has been treated by the spring designers.The finishing (finishing) process is to put the spring directly into a series of finishing machines, such as tilting centrifugal type or spiral vibrating type, eddy current type, and add appropriate grinding materials, grinding agents and water for finishing.General optical finishing is about 20 to 30min. Specific optical finishing time depends on the spring shape and the amount of device.After finishing the finish, remove the spring and rinse it with tap water, then immerse in the SM series water film replacem...
2018 - 10 - 20
1) the selection basis of environmental factors in the use state of spring products: corrosion resistance, acid corrosion resistance, alkali corrosion resistance, salt corrosion resistance, water corrosion resistance, etc.Weather resistance;Resistance to stress and corrosion, fatigue and corrosion, etc.Wear resistance;Temperature resistance, etc.Radiation resistance, etc.2) selection basis of load characteristics of spring products: dynamic pulse-type cycle load, variable load, impact load, corrosion fatigue load, static load, large load and fatigue load, etc.3) selection basis of mechanical p...
2018 - 11 - 03
Internal combustion engine valve spring, low, medium and high stress valve spring, safety valve spring, pressure reducing valve, electric regulating valve, pneumatic regulating valve, self-support regulating valve, hydraulic control valve, steam trap, gate valve, as per valve, butterfly valve, ball valve, check valve, special valve, hydraulic valve, electromagnetic valve, etc.Relief valve: spring safety valve by using the spring force, spring loaded relief valve is closed and not closed in two kinds of structure, general inflammable, explosive or toxic medium should choose enclosed, steam or i...
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8, detection of fatigue property and relaxation rate of spring8.1 spring fatigue performance testing requirements: the spring that bears the variable load is in the internal quality of the enterprise.Quantity control, user inspection, new product certification, certification, industry sampling and process adjustment.In the ring section, the fatigue performance must be tested. The testing method can be tested by fatigue life testThere are two kinds of certificate test or reliability evaluation test, but they are classified and certified for products.Reliability evaluation test must be adopted t...
2018 - 08 - 13
With the development of spring application technology, more requirements for spring materials are put forward. The main reason is to improve the fatigue life and anti relaxation performance under high stress; secondly, according to different uses, it is required for corrosion resistance, non magnetic, electrical conductivity, wear resistance, heat resistance and so on. In addition to the development of new varieties, the spring materials have achieved beneficial results in the aspects of strict control of chemical composition, reducing non-metallic inclusions, improving the surface quality and...
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Like most other basic mechanisms, metal springs have existed for a long time in the bronze age. Even for metals, wood is used as a structural member of flexible bow and arrow and military catapult. In the Renaissance, precise clocks made precision springs the first necessity. In Fourteenth Century, we saw the precise clock of revolutionary astronomical navigation developed. The world's exploration and conquest of European colonial powers continue to provide impetus for watchmakers "science and art." The other area of the firearm promotes the development of the spring. At the dawn of ...
2018 - 09 - 10
The corrosion of spring can be divided into chemical corrosion and electrochemical corrosion according to the type of reaction.They are the result of changes in the metal atoms on the surface of the spring or the loss of electrons to an ionic state.If the metal on the surface of the spring simply reacts with the surrounding medium, and the spring causes corrosion, it is called chemical corrosion.For example, the spring is oxidized in the particularly dry atmosphere to form an oxidation film, and the spring is chemically changed with the liquid or impurity in the non-electrolyte liquid, which i...
2018 - 09 - 21
Compression springs are frequently seen and used in daily life. The main principle of compression springs is to provide a hand to the machine and drive it to work.The compression spring has a certain damping capacity, because the product's elastic force is not a fixed value, so every time it is used, there will be a return force, and the force is not a fixed size, which to some extent has the ability to slow down the vibration.As an example, now the car is installed above a compression spring, you will find when driving, its speed is greatly improved, and the movement process there is no sound...
2018 - 10 - 08
The oxidation treatment of the spring (also known as bluish, blackened, cooked black, etc.) is mainly used to prevent the corrosion of the spring, and also to make the spring appearance bright.Oxidation treatment methods include: alkaline oxidation, alkali free oxidation and electrolytic oxidation.Spring oxidation treatment is often alkaline oxidation treatment, in the presence of oxidants (such as sodium nitrite) in caustic sodium solution.As the solution approaches the boiling point, the iron on the surface of the spring dissolves and forms sodium ferrite and sodium ferrite, which is then ma...
2018 - 10 - 18
For a long time, the shape and performance of the extension spring will change. If the extension spring is always in a certain situation, it may change its quality due to external conditions.Generally, there are the following situations:I. wear of extension spring :Wear can be divided into abrasive, fatigue and corrosion wear fracture.Ii. Brittle fractureThe majority of spring break belongs to brittle fracture.Plastic fracture is possible only when the working temperature is high.In engineering, fatigue fracture, stress corrosion fracture and hydrogen embrittlement fracture are called brittle ...
2018 - 10 - 30
The ground spring is also a hydraulic door closer, except that it presses the spring with a worm gear rather than a rack and pinion.Because the worm wheel can be rotated in a positive and negative direction, the ground spring can be used for two-way open doors, while the door closer can only be used for one-way open doors.The technical key of the ground spring is the bearing seat at the lower part of the main shaft, which determines the bearing grade of the landing spring.Because the ground spring used for two-way doors carries the weight of the door, the weight of the door is crucial to the s...
2020 - 01 - 06
When choosing the right spring, selecting the best spring wire is a critical before manufacturing. Below are some of the most common spring wire materials and their unique characteristics .Stainless Steel SpringsStainless steel springs have low-stress relaxation and resist corrosion. They have good strength at moderate temperatures and are resistant to heat. Extension springs are most commonly made from stainless steel.Extension springs absorb energy and provide resistance to pulling. As the name suggests, an extension spring stretches as a load is applied to it. Applications for extension spr...
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The Standing treatment of the spring

日期: 2018-10-09
浏览次数: 258

1. The standing treatment of the compression spring is to compress the spring to the working limit height or to tighten the height several times, usually 3 to 5 times;For the stretching spring, the length of the spring is drawn to the working limit several times;Torsion spring, is the spring in the working direction of the 5522 for the ultimate torsion Angle several times.

2. Strong pressure (strong tension and strong torsion) treatment for compression spring is to press the spring into the material layer and the stress exceeds the yield point, resulting in negative residual stress on the surface and positive residual stress on the heart.

There are two technological methods: one is the static pressure, which presses the spring to the required height.This method takes up more process equipment and equipment and takes up a larger site.But the performance is more stable. Suitable for some small springs.

The  Standing treatment of the spring

Another method is to press the spring to the specified height at a slower speed (about 1min), and then release it slowly (about 1min), causing the spring to undergo plastic deformation.Then, the vertical processing is carried out at this height.This method has the same effect as the static pressure and is applicable to all kinds of large springs.

FIG. L shows the stress distribution on the cross section of the helical compression spring material in the process of high pressure treatment.FIG. 1-a shows that the spring is in a free state (i.e. before the pressure treatment) and the stress on the material section is zero.FIG. 1-b shows that the spring is subjected to load F1, which is less than the elastic limit of the material, and the material is subjected to non-uniform shear stress. The maximum value is at the surface of the material, and the central stress of the material is zero.FIG. 1-c refers to the continuous loading of the spring to F2 and the compression of the spring. At this time, the material surface stress exceeding the elastic limit of the material produces plastic deformation.FIG. 1-d when the load F on the spring is removed, the elastic deformation part of the inner layer of the material begins to recover, but cannot be completely recovered due to the influence of plastic deformation of the outer layer of the material.In this way, the residual shear stress is left in the inner and outer layers of the material.The direction of shear stress is the same near the core of the material.FIG. 1-e refers to the situation where the material is subjected to shear stress when the spring is loaded again to the rated working load F(lower than the strong pressure load). At this point, the stress increases after adding the shear stress at the core of the material and the residual shear stress, and the surface working stress is opposite to the residual shear stress, and the shear stress decreases.This variation in stress distribution gives full play to the material's core potential.

Different types of spring have different ways of dealing with strong pressure.The torsion bar spring is the torque that places the torsion bar in the direction of the working load, and exceeds the elastic limit of the torsion bar shear.Compression and tension loads are applied to the compressed and stretched spring separately exceeding the shear elastic limit of the spring material.The torsion spring is applied to the torque exceeding the elastic limit of the spring material.In conclusion, the type and direction of load applied to the spring should be consistent with the type and direction of load applied to the spring.Residual stress is determined by the degree of residual deformation, which makes the size tolerance of the spring difficult to control. Therefore, the size of the load must be considered in the design.

FIG. 1 cross section stress distribution in the compression spring under strong pressure

A) the stress before the strong pressure is o b) the linear distribution of the initial stress under the strong pressure and c) the stress distribution at the time of turns

D) residual stress after high pressure e) stress distribution during reloading after high pressure

Under the same working conditions, the fatigue life of the spring can be increased by 5% ~ 35% if the reinforcement is properly handled.On the contrary, if not handled properly, if the pre-load load is too large, fatigue life will be reduced.In addition, after working for a certain period of time, with the residual deformation and the change of spring performance, the normal operation of the spring will be damaged.

In order to prevent creep and relaxation of the spring under high temperature conditions, the spring should be subjected to enhanced pressure or creep tempering.The warm and strong pressure treatment is the strong pressure treatment under the condition that the spring is higher than the working temperature.The process of low temperature tempering under load loading (usually in the deformed or coiled state at work) is called creep tempering.The main difference between the two is the stress and the heat preservation time.This is beneficial for springs operating in a warmer environment, preventing relaxation on the one hand and increasing fatigue strength on the other.

Heating and strong pressure treatment and creep tempering are mainly used in the spiral spring formed by cold machining.Their treatment conditions (temperature, stress, time) are selected according to the design requirements of the spring.Steel spring, usually used in 200 ~ 200 ℃ temperature, creep tempering time for about 30 min, heating can crush processing time is 2 ~ 6 h.For heat-resistant spring materials, the temperature can be higher, the time can be longer.

After standing or strong pressure treatment, such as low temperature tempering, the spring's proportional limit and load-bearing capacity will be improved, especially for the precision spring and the spring with slightly higher temperature, which have obvious effects in improving the spring performance and improving the pass rate.

The temperature of tempering should be slightly lower than that of de-stressing annealing, considering the residual strain of the microstructure between the metal lattices and the decreasing of the macroscopic residual stress.In general, copper spring tempering temperature is 160 ~ 200 ℃, 1 h heat preservation;Steel springs tempering temperature is 200 ~ 400 ℃, the heat preservation about 30 min.

3. The calculation of the prefabricated height of the spring is that the free height of the spring should be reduced after the fixing treatment and the strong pressure treatment.In order to make the spring reach the free height specified on the pattern, the rolling height of the spring should be set aside for deformation except the free height. This height is called precast height.Because there are many factors influencing the setting and the strong pressure treatment, the deformation amount cannot be calculated accurately.

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Constant force spring, or “clock” spring, is a roll of prestressed strip which exerts a nearly constant restraining force to resist uncoiling. The force is constant because the change in the radius of curvature is constant.   Such applications as brush springs for motors, counterbalance springs for window sashes and carriage return springs for typewriters. Constant force motor springs are used to drive mechanisms for timers, movie cameras and cable retractors.Constant force spring also known as coil spring helix in a plane of the spring, Spring is the material wound into a plane of the spiral of a spring, the spring is fixed at one end, the other end of the material after acting torque bending torque, bending elastic deformation, so the spring in its own plane to p...
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