HOT INFORMATION / More
1
2018 - 04 - 18
The most common way to classify springs is by how load is applied to them. You’re probably familiar with the following:Compression spring: designed to operate with a compressive load and found in shock absorbers, spring mattresses, mechanical pencils, and retractable pens. Extension spring: designed to operate with a tensile load. An archetypical example is a Slinky, but these are also found in luggage scales and garage door mechanisms. Torsion spring: designed to operate with torque (twisting force); powers every clothespin and mouse trap.
2
2018 - 07 - 30
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...
3
2018 - 08 - 10
Stainless steel spring general precautions when washing, please pay attention to no surface friction to avoid the use of bleaching components and washing liquid containing abrasives, steel ball, grinding tools, etc., in order to remove the washing liquid, washing the end, rinse the surface with clean water.Surface state and washing methodDust and scaling - wash with soap or warm water.Label and film - scrub with warm water and weak detergent.Binder ingredients - use alcohol or organic solution;Fat, oil, lubricating oil contamination - with soft cloth or paper after drying with a neutral deterg...
4
2018 - 08 - 24
The most common way to classify springs is by how load is applied to them. You’re probably familiar with the following:Compression spring: designed to operate with a compressive load and found in shock absorbers, spring mattresses, mechanical pencils, and retractable pens.Extension spring: designed to operate with a tensile load. An archetypical example is a Slinky, but these are also found in luggage scales and garage door mechanisms.Torsion spring: designed to operate with torque (twisting force); powers every clothespin and mouse trap.
5
2018 - 09 - 07
In the heat treatment of forgings, the way of placing parts to reduce deformation is to hang them vertically as far as possible, to place them vertically at the bottom of the furnace, to support them horizontally with two points, to place the fulcrum between one-third and one-fourth of the full length, and to place them flat on the heat-resistant steel tooling.In the cooling process of parts, the types, cooling properties and hardenability of quenching medium are related to deformation. The change of cooling performance can be adjusted by changing the viscosity, temperature, liquid pressure, a...
6
2018 - 09 - 19
Spring steel wire will generate residual stress during the process of cold drawing and oil quenching and heat treatment. Moreover, spring wire is formed during the process of manufacturing and shot peening is conducted.High frequency quenching, carburizing, nitrification, etc. are used as surface hardening treatment. As a result of these treatments, residual stress will be generated in the material.The qualitative and quantitative analysis of the residual stress of the material will be an important factor to improve the fatigue properties of the spring.Residual stress of the spring is usually ...
7
2018 - 09 - 29
The spring relief valve is mainly composed of spool, seat, stem, spring and adjusting screw.The relief valve mainly USES spring force to press the spool on the seat.When the boiler pressure exceeds the pressure exerted by the spring on the upper part of the spool, the spool and stem are lifted and steam is discharged.When the boiler pressure is lower than the spring pressure acting on the upper part of the spool, the spool falls on the seat and the boiler stops discharging steam.The spool is a cone with a slight protrusion around the edge of the spool.When the steam opens the valve core, the e...
8
2018 - 10 - 16
A, definitions,Spring steel refers to the steel specially used to make spring elastic elements due to its elasticity in the quenching and tempering states.The elasticity of steel depends on its elastic deformation capacity, that is, within the specified range, the elastic deformation capacity makes it bear a certain load, and no permanent deformation occurs after the load is removed.Spring steel shall have excellent comprehensive performance, such as mechanical properties (especially elastic limit, strength limit and yield ratio), anti-elastic and anti-elastic properties (i.e. anti-elastic and...
9
2018 - 10 - 26
Most widely used, in manufacturing, the spiral wound into a separate ring, so that each ring gap (pitch), so that force contraction, to maintain tension to the two ends.When under the maximum load, it cannot be completely compressed, and the gap must be kept between effective turns to avoid friction or other material embedding, causing fatigue damage.The free length of the spring should be equal to the solid length of the spring plus the gap and the amount of deformation.To increase the contact surface of the compression spring, the surface should be ground to obtain 60~80% contact surface.Its...
NEW INFORMATION / More
1
2018 - 04 - 18
The most common way to classify springs is by how load is applied to them. You’re probably familiar with the following:Compression spring: designed to operate with a compressive load and found in shock absorbers, spring mattresses, mechanical pencils, and retractable pens. Extension spring: designed to operate with a tensile load. An archetypical example is a Slinky, but these are also found in luggage scales and garage door mechanisms. Torsion spring: designed to operate with torque (twisting force); powers every clothespin and mouse trap.
2
2018 - 08 - 06
We can look at the relationship between the force applied to a spring and its resulting displacement. Again, there are three classes of springs: linear (or constant rate) springs, variable rate springs, and constant force springs. Linear springs Linear springs obey Hooke’s Law (F=k*x), which means that the force needed to extend or compress such a spring by distance x is proportional to the distance, as long as the force doesn’t exceed the elastic limit of the spring. Torsion springs obey an analogous version of Hooke’s Law (F=k*θ, where θ is an angle). In both cases, k is the spring rate, and...
3
2018 - 08 - 17
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...
4
2018 - 09 - 03
In order to remove the detergent, wash the surface with clean water at the end of washing.Surface condition and washing methodDust and easy to remove dirt - wash with soap, weak lotion or warm water.Label and film: scrub with warm water and weak detergent.Binder composition - using alcohol or organic solution;Fat, oil, lubricating oil contamination - with a soft cloth or paper after drying with a neutral detergent or ammonia solution or special detergent to wash;Bleaching agent and seed acid adherence - immediately rinse with water, soak in ammonia or neutral soda solution, then wash with neut...
5
2018 - 09 - 17
(1) metal tissue1. Metal: it has good thermal and electrical conductivity with opaque and metallic luster, and its electrical conductivity decreases with the increase of temperature, and it is rich in ductility and malleability.A solid (or crystal) in which the atoms of a metal are regularly arranged.2. Alloy: a substance which is composed of two or more metals or metals and non-metals and has metal properties.3. Phase: components with the same composition, structure and performance in the alloy.Solid solution: an atom (compound) of one (or several) element dissolves into the lattice of anothe...
6
2018 - 09 - 27
In the actual work, we often encounter that the spring cannot push the moving object to the set position, that is to say, the length of the spring's computational freedom becomes shorter.The main reason is that there is no initial compression, that is, a spring is made into a spring, which is compressed to its compression height or to its compression height (if necessary) with a greater force, and cannot be restored to its original free length upon release.Its shortened quantity is called "initial compression quantity".After repeating 3-6 times of compression, the length is no longer...
7
2018 - 10 - 12
The spring is often corroded by the surrounding medium in the process of manufacture, storage and use.As the spring works under the influence of the spring force, the spring force will change and lose its function after being corroded.Therefore, preventing the corrosion of the spring can guarantee the stability of the spring and extend its service life.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 st...
8
2018 - 10 - 23
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 calle...
9
2019 - 12 - 11
A compression spring comes in many configurations, shapes and sizes. They are conical, hourglass and barrel of varying lengths—and can be used as a shock absorber, vibration damper, a pure energy accumulator, or force generator. Because of their versatility, how efficiently they store energy and the multiple shapes in which they can be manufactured, these types of mechanical springs have a wide selection of applications.In the automotive industry, compression springs are used throughout the vehicle. In the medical applications , compression springs are used as parts in assemblin...
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Properties of spring material

日期: 2018-09-22
浏览次数: 57
Daisy

1) high strength: in order to improve the spring's ability to resist fatigue failure and relaxation, the spring material should have a high yield strength and elastic limit, and in particular, a high ratio of strength to strength.In general, the elastic limit of the material is directly proportional to the yield strength, so the spring design and the manufacturer always want the material to have a high yield strength.The tensile strength and yield strength of the spring material are close, for example, about 90% of the carbon steel wire of cold drawn is about: since the tensile strength is easier to be measured than the yield strength, the tensile strength is provided in the delivery of the material, so the tensile strength is generally used as the basis in design and manufacture.However, the material's tensile strength is not the higher the better, the higher the strength will reduce the material's plasticity and toughness, and increase brittle tendency.The tensile strength of the material is related to its chemical composition, metallographic structure, heat treatment, degree of cold processing (drawing or rolling) and other factors such as strengthening process.There is also a certain relationship between tensile strength and fatigue strength. When the material is below 1600MPa, its fatigue strength increases with the increase of tensile strength.

2) good plasticity and toughness: during the spring manufacturing process, the material has to undergo processing deformation of different degrees, so a certain plasticity is required.For example, the hook ring and torsion arm of the spring with complex shape, when the radius of curvature is very small, the spring material shall not have defects such as cracks and broken in the process of winding or stamping forming.At the same time, when the spring bears the impact load or variable load, the material should have good toughness, which will be of great benefit to the life of the spring.

Properties of spring material

3) excellent surface state and the fatigue performance: the biggest spring under the surface of the work stress, and fatigue failure often starts from the surface of steel wire, for use in the important occasion of the spring, such as valve spring, valve spring and the suspension spring are required to have millions of times, even tens of millions of times more long cycle life, it's on the material fatigue performance of the high demands are put forward.There are many factors that affect the fatigue properties of materials, such as the chemical composition of materials, hardness, purity of steel, surface quality and metallographic structure, especially the surface quality of materials.The surface defects of materials, such as cracks, folds, scales, rust, pits, scratches and indentations, can easily cause stress concentration in the working process of the spring.The stress concentration is often the source of fatigue failure.The fatigue source is also easy to occur at the site of surface decarburization, so strict control of decarburization depth is also a very important quality indicator.In order to improve the surface quality of the spring material, the material surface can be polished or polished. Before steel wire drawing, a layer of material epidermis can be removed by peeling technology. In this way, most surface defects can be removed.Spring heat treatment can be used to control the atmosphere or vacuum heat treatment to prevent surface decarburization and oxidation.

4) strict dimensional accuracy: many springs have higher requirements on load accuracy. For example, the load deviation of valve springs should not be greater than 5%-6% of the specified load. Take pull and pressure springs with round steel wire as an example.It can be seen that strict dimensional accuracy is also very important to ensure the quality of the spring.

5) good uniformity: the uniformity requirements for materials refer to the uniformity and stability requirements for the chemical composition, mechanical properties, dimensional deviation and other indicators of materials.If all aspects of the material performance is inconsistent, it will bring great difficulties to the spring production, resulting in the product geometric size, hardness, load and other parameters of dispersion, serious non-uniformity and even waste.

In order to meet the above performance requirements, spring steel must have excellent metallurgical quality, including strictly controlled chemical composition, high purity, low impurity content, low non-metallic inclusion content, and control its shape, particle size and distribution.In addition, homogeneity and stability of steel are required.Spring steel shall also have good surface quality (including surface decarburization) and high precision shape and size.

At present, spring steel is mainly produced by electric furnace or converter, which is characterized by high power and capacity, and is used as spring material for general machinery.For materials with high performance springs, ladle refining, vacuum degassing and other outside refining technologies are widely used, such as ladle blowing argon, ladle refining furnace (LF), vacuum treatment (RH), etc., to strictly control chemical composition and reduce the content of gas and various non-metallic inclusions.In addition, non-metallic inclusion control technology is adopted to control the shape, particle size and distribution of non-metallic inclusions, such as feeding human calcium wire and spraying calcium powder to make non-metallic inclusions contain CaO and control their particle size.In the process of steelmaking, the composition of non-metallic inclusions is changed by adjusting the deoxidizer and furnace slag to make it easy to plastic deformation during hot rolling.By using RH degassing technology, the oxygen content can be greatly reduced and the fatigue life can be significantly improved.

Continuous casting has been widely used in spring steel production.Compared with mold casting, continuous casting can reduce the segregation of steel and improve the uniformity of steel by electromagnetic stirring and low temperature casting.Reduce secondary oxidation and improve surface decarburization of steel;Make the structure and properties of steel stable and uniform;Increase yield and productivity;In combination with outside refining technology to reduce oxygen content and effectively control the chemical composition of steel.

The longitudinal continuous rolling mill is widely used in foreign countries for high speed, no twist, no tension rolling under the condition of increasing the dimensional deviation of spring steel, section shape, surface quality (including the depth of decarburization) and the microstructure uniformity along the length of steel.Short stress line or prestress mill is used to ensure steel size accuracy.


Relevant recommendations
2020 . 01 . 13
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...
2020 . 01 . 13
A compression spring is an open-coil helical spring that offers resistance to a compressive force applied axially. They are usually coiled at a constant diameter, though they can be coiled in other needed forms such as conical, concave (barrel), convex (hourglass), or various combinations of these. Compression springs are used to resist force and/or store energy,1、CharacteristicsBy far the most widely used type of spring, compression springs are designed to oppose compression and return to its uncompressed length when the applied force is removed. 2、Service LifeIt should be noted that if critical force-versus-deflection linearity is required, only the center 60-80% of the available deflection range should be employed.Thus, reserve at least the first and last 15-20% of t...
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 springs include carburetors, trampolines and farm machinery.Oil Tempered Spring WireOil tempered wire is cold drawn and heat treated before plating. Ideal as a general purpose spring wire, it is often us...
2020 . 01 . 06
springs are a mechanical part that use elasticity to work. Generally made of spring steel. It is widely used in machines and instruments to control the movement of machine parts, mitigate impact or vibration, store and store energy, measure force, etc.The spring is just an accumulator, it has the function of storing energy, but can not release the energy slowly, to achieve the release of this function should rely on the 'spring + large transmission ratio mechanism' to achieve, common in the mechanical table.The spring is widely used in the mechanical and electronic industry. The spring can produce a large elastic deformation under load and convert mechanical work or kinetic energy into deformation energy. After unloading, the spring's deformation disappears and returns to its original stat...
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