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Which industry is the main application of spring?

2018 - 07 - 25

1, matching springs and springs based on automobiles, motorcycles, diesel engines and gasoline engines. This type of spring has valve spring, suspension spring, damping spring and clutch spring, etc., with a large amount, which accounts for about 50% of the spring production. At the same time, the technical level is also high, it can be said that the technical level of these springs is representative, they are mainly to the high fatigue life and high anti relaxation direction, thus reducing the quality. 2. Large springs and plate springs, which mainly include railway rolling stock, heavy ...

Each of these types can be further characterized.

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...

Inspection content and specification for spring parts(part 6)

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...

Steps of hardware spring pressure test

2018 - 09 - 03

The spring pressure test of metal springs usually uses electronic digital spring tension and compression testing machine. Electronic digital spring tension and compression testing machine is a special instrument for testing the deformation and load relationship characteristics of tension and compression springs. It is suitable for testing the working load of the tension and compression spring under a certain working length, and also for testing the elastic load of elastic devices such as rubber and spring.The pressure test of metal springs is generally divided into the following steps:1. Compr...

Study on factors influencing decarburization of 55SiCr surface of spring steel during heating

2018 - 09 - 14

55SiCr is the high-grade steel used for automobile suspension springs. The suspension springs bear the reciprocating compression motion in the process of automobile driving, and play the role of buffer and shock absorption, which has high requirements on the performance of steel.Decarburization is one of the main problems in the hot processing of spring steel. Decarburization of spring steel surface will seriously damage the fatigue performance of spring, especially when the total decarburization of ferrite occurs on spring steel surface, the fatigue limit of spring can be reduced by 50%.At pr...

Spring material selection method

2018 - 09 - 26

The selection of spring material shall be determined according to the properties of the spring bearing load, stress state, stress size, working temperature, environmental medium, service life, requirements for conducting and magnetic conductivity, technical performance, material source and price, etc.When determining the shape and size of the material section, the series sizes specified in the national standards and ministerial standards should be selected first, and non-standard series of materials should be avoided as far as possible.Medium and small-sized springs, especially spiral-tension ...

Type of paint used on spring surfaces

2018 - 10 - 11

Type of paint used on spring surfacesThe 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...

Surface treatment of springs

2018 - 10 - 22

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...

THE APPLICATION OF COMPRESSION SPRING

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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Inspection content and specification for spring parts(part 3)

2018 - 07 - 28

6.1.10 detection of parallelism between ends of springs: the spring is placed vertically on the plate.The difference between the maximum and minimum values of the surface of the end ring is measured by the dial indicator. The difference between the maximum and minimum values is the parallelism deviation between the ends of the spring.6.1.11 spring straightness detection: put the spring level on the plate and roll one.Zhou, determine its maximum bending position and measure the gap between the maximum bending point and the flat plate with a feeler gauge.The measured gap is the deviation of the ...

Common specifications of spring

2018 - 08 - 09

The number of diameter length is described!(1) the diameter of the spring wire d: is the wire diameter of the spring. (2) the maximum outer diameter of the spring outer diameter D: spring. (3) the inner diameter of the spring D1: the smallest outer diameter of the spring.(4) the middle diameter of the spring D2: the average diameter of the spring. Their formula is: D2 = (D + D) = 2 = D 1 + D = D D.(5) apart from the support ring, the distance between the two adjacent circles of the spring corresponding to the axial distance of the point on the middle diameter is t:, and is expressed ...

What is the salt spray test?

2018 - 08 - 23

Salt fog refers to the dispersion system composed of salt micro droplets in the atmosphere. It is one of the three defense series of artificial environment. Many enterprise products need to simulate the destructive nature of the marine surrounding climate to the products. The salt fog test is a simulation of this phenomenon, so the test equipment, salt fog test box, came into being.Salt fog can be divided into two categories, one is natural environmental exposure test, the other is artificial accelerated salt spray environmental test. The artificial simulated salt fog environment test is a kin...

Analysis of deformation prevention measures for heat treatment of metal spring(part 2)

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...

Testing spring residual stress

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 ...

Metal spring plays an important role in safety valve

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...

Definition and classification of spring steel

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...

Compression spring

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...

Spring Design

2019 - 12 - 30

Spring design and its fabrication play an important role in manufacturing and industry around the globe. Springs come in all shapes and sizes to meet industry needs and are made from a wide range of metal alloys. Materials used for spring design and wire forming consist of high strength alloys.In general, wire formed into springs is cold rolled or drawn, and a made of medium to high carbon steel with high yield strength that allows for excellent elastic properties.Mechanical PropertiesThe mechanical principles of springs are very basic. They are an elastic component. Potential mechanical ...

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Measures to improve spring mass

日期： 2018-10-15

浏览次数: 392

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(1) deformation heat treatment -- the combination of deformation reinforcement and heat treatment enhancement to further improve the strength and toughness of steel.Heat treatment of deformation has high, medium and low temperature.The high temperature deformation heat treatment is to produce the deformation immediately after the austenitic state at a stable distance, or can be combined with forging or hot rolling, that is, quenching immediately after hot forming.The deformation heat treatment has been applied to automobile plate spring production.(60 si2mn)

(2) isothermal quenching of spring -- isothermal quenching can be adopted for springs with small diameter or sufficient permeability. It can not only reduce deformation, but also improve strength and toughness. It is better to conduct another tempering after isothermal quenching, which can increase the elastic limit.

Measures to improve spring mass

(3) relaxation treatment of spring -- the spring works under the action of external forces for a long time. As a result of stress relaxation, slight permanent (plastic) deformation can be generated. Especially for the spring working at high temperature, stress relaxation is more serious at high temperature, which reduces the precision of the spring.Therefore, this kind of spring should be relaxed after quenching and tempering -- preloading the spring so that its deformation exceeds the possible deformation when the spring is working.Then heat it at a temperature of 20C above the working temperature for 8-24h.

(4) low temperature carbonitriding -- the combination of tempering and low temperature carbonitriding (soft nitriding) can significantly improve the fatigue life and corrosion resistance of the spring.

(5) shot peening treatment -- surface defects such as scratch, folding and oxidized decarburization often become the stress concentration and fatigue fracture source when the spring is working.If the spring surface is sprayed with small steel pellets at high speed, it can not only improve the spring surface quality, increase the surface strength, but also keep the surface in the state of compressive stress, so as to improve the spring fatigue strength and service life.

Operation precautions

(1) check the surface for decarburization, crack and other defects before heat treatment.These surface defects will seriously reduce the spring's fatigue limit.

(2) in quenching and heating, special attention should be paid to prevent overheating and decarburization, do a good job in salt bath deoxidation, control the atmosphere of furnace gas, and strictly control the heating temperature and time

(3) in order to reduce deformation, the installation mode of the spring during heating, the form of clamping device and the quenching cooling method during cooling.

(4) tempering should be done as soon as possible after quenching and heating should be done as far as possible.The rapid cooling after tempering can prevent the brittleness of tempering and cause the surface compressive stress and improve the fatigue strength.

Quality inspection

Before heat treatment --

(1) the rolled surface of steel is usually the surface after making the spring, so there should be no cracks, folds, spots, wrinkles, air bubbles, interlayer and pressed oxide skin.

(2) the surface decarburization can significantly reduce the fatigue strength of spring. The depth of decarburization layer should be tested according to regulations.

After heat treatment --

(1) the naked eye or low-power magnifier shall observe no crack, corrosion pitting and severe quenching deformation of the spring watch.

(2) the hardness and uniformity are in line with the regulations.In mass production, it is allowed to sample hardness with a file, but it must be noted that the position of the file mark should not affect the final precision of the spring.

(3) the metallographic structure shall be a mixture of troxoid or troxoid and sorbite.

(4) after the plate spring is assembled, permanent deformation and static deflection tests under the working load are usually performed.

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