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HOT INFORMATION / More

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.

Inspection content and specification for spring parts(part 4)

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...

How much do you know about the cleaning of stainless steel springs？

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...

Types of springs and their applications

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.

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...

NEW INFORMATION / More

Types of springs and their applications

2018 - 04 - 18

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...

What is the cleaning and cleaning of stainless steel springs?

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...

Knowledge of metal structure and heat treatment

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...

Spring not in place and failure reasons

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 lo...

Overview of spring surface treatment

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...

Working characteristics of compressure spring

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...

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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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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