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The development course of spring material (Part 1)

2018 - 07 - 23

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...

Summary of spring parameters and symbols (Part 3)

2018 - 08 - 02

Fr- spring radial load (N) Radial stiffness of the F'r-spring (N/mm) Fs- spring test load (N) F- Spring deformation (mm) Fj- deformation under working limit load Fj (mm) Fr- spring static deformation (mm) Fs- The amount of deformation of the spring under the test load Fs (mm); the amount of linear static deformation (mm) Fo- tension spring corresponds to the assumed deformation amount (mm) of the tensile force Fo; the central deformation amount of the diaphragm (mm) G-material shear modulus (MPa) &...

nspection content and specification for spring parts(part 2)

2018 - 08 - 15

Detection of geometric size of 6.1 compression springs6.1.1 spring material diameter detection: check the spring material diameter generally with vernier caliper or micrometer. In particular, attention should be paid to the inspection of springs with small winding wires and annealed alloy wires wrapped by automatic spring coiling machines.6.1.2 spring free height or free length detection: the spring is generally placed in horizontal position measurement. It is allowed to be placed in erect position only when the self weight has no obvious effect on the height or length of the spring when it is...

Analysis of surface defects of carbon steel wire rod

2018 - 08 - 29

In view of the harm caused by the surface defects of high carbon steel wire rods, the surface defects of high carbon steel wire rods were systematically analyzed by means of surface pickling, metallographic analysis and scanning electron microscopy, the types of defects were determined, the causes of defects were analyzed, and the improvement measures were put forward. After the implementation of these measures, the surface defects of high carbon steel wire rods were basically eliminated. Surface quality defects. The conclusions are as follows: 1. The surface defects found in high carbon ...

Spring machine regular maintenance and daily maintenance is very important

2018 - 09 - 12

Spring machine is now in the production of spring necessary equipment, due to the abundant of spring and the increase of precision is also more and more high to the requirement of spring machine, the spring machine maintenance is particularly important at ordinary times, and the main factors affecting the service life of spring machine has two, one is the operator of whether scientific and standardized operation, another is reasonable in daily maintenance.After using the spring machine for a period of time, the efficiency of the machine will be significantly reduced, affecting the efficiency o...

Properties of spring material

2018 - 09 - 22

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...

Type of paint used on spring surfaces

2018 - 10 - 09

The paint used for the spring coating is usually of the following types:(1) asphalt paint has good water resistance, moisture resistance and corrosion resistance, especially excellent acid resistance and good alkali resistance.But adhesion, mechanical strength, poor decorative performance.(2) phenolic paint can be divided into two types: primer and topcoat. Phenolic primer has strong adhesion, good rust resistance, but poor mechanical strength and gloss.Phenolic coating film is hard, gloss good, but poor weather resistance, easy to yellow.(3) alkyd paint alkyd paint film is tough, with strong ...

The manufacturing process of cold formed spring

2018 - 10 - 19

When the spring is made from materials that do not need to be hardened or tempered after forming, the process is spiral compression spring: rolling, de-stressed annealing, grinding of two ends, (shot blasting), (rectification), (de-stressed annealing), standing or strong pressure treatment, inspection, surface anti-corrosion treatment, packaging.Coil stretching spring: rolling, de-stress annealing, hook making, (cutting the tail), de-stress annealing, standing treatment, inspection, surface anti-corrosion treatment, packaging.Spiral torsion spring: rolling, de-stress annealing, torsion arm mak...

Electroplating after spring processing

2018 - 11 - 02

Zinc electroplating: zinc is stable in dry air and changes little. A white film of zinc oxide or carbon zinc carbonate is formed in moist air. This dense film will prevent further corrosion. Therefore, the galvanizing layer is used for the spring corrosion protection under general atmospheric conditions. Zinc coating should not be used for all springs that are in contact with solutions such as sulfuric acid, hydrochloric acid and caustic soda, as well as springs that work in humid air such as sulfur trioxide.Generally, passivation of galvanized coating can improve the protective performance of...

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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...

Each of these types can be further characterized.

2018 - 08 - 24

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 springsLinear 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 i...

Strengthening technology of spring

2018 - 09 - 08

(1) heat treatment technology for strengthening springs.1) protective atmosphere heat treatment. In our country, protective atmosphere heat treatment is adopted in spring, oil quenched and tempered steel wire and toughened steel whose wire rod is less than 15mm. Heat treatment in protective atmosphere can remove surface decarbonization and oxidation and improve the surface quality of materials.2) induction heating or protective atmosphere induction heating heat treatment. This process is usually carried out on the wire before forming the coil spring. Some spring factories combine heat treatmen...

Basic knowledge of spring compression amount of die

2018 - 09 - 20

The purpose of mold spring is to take off material, press material, the strength of the spring, which is related to whether the mold production is smooth, whether the product is qualified.Spring force is small, may cause the product to be out of shape, the mold does not take off the material, the product is bad to take out from the mold inside, the belt material, the knife edge, punch easy to wear and so on each kind of question.Mold spring according to different production times, compression amount selected, the larger the spring life, the shorter die life, of course, the broken spring can be...

Proper use of the spring

2018 - 09 - 30

Please avoid the improper way of using (1) more than the use of the maximum compression (300000 back to the conditions, after a close with the use of a long) stress causing the wreck, close to close with the use of a long, can make the spring line department gradually close to that, because of the high spring constant change caused by load curve with high, nearly and produce high stress to make spring break, please do not use more than 300000 times.The use of the spring without prepressure due to the gap caused the spring up and down vibration caused the spring distortion, if there is prepress...

Wash the stainless steel surface

2018 - 10 - 17

Washing method according to the surface state:General considerationsWhen washing, please pay attention not to scratch the surface to avoid using the bleaching ingredients and the cleaning solution containing abrasive agent, steel ball (brush roller ball), grinding tools, etc. In order to remove the cleaning solution, wash the surface with clean water at the end of washing.Surface condition and washing methodDust and dirt are washed with soap, a mild detergent, or warm waterLabel and film with warm water, weak detergent to scrubThe binder ingredient is alcohol or organic solutionUse a mild clot...

Extension spring

2018 - 10 - 29

Each circle is formed into a tightly closed spiral ring or a pitch ring, which extends outwards when subjected to external forces and maintains a force of contraction towards the middle.There are many kinds of spring hooks: English hook, German hook, earring hook, fishtail hook, etc.(1) free length: (a) total length, (b) total length of the ring, and (c) length inside the hook ring.(2) control diameter :(a) outside diameter, (b) inside diameter, (c) inside diameter of casing.(3) steel wire size "wire diameter".(4) materials (type, grade).(5) winding number :(a) total winding number a...

The passivation process for springs

2019 - 12 - 30

1、What is Passivation?As a post-fabrication method, passivation is intended to maximize the natural corrosion resistance of stainless steel. Stainless steel is a steel alloy that contains a minimum of 10.5% chromium content by mass and along with a number of other alloys. When stainless steel is newly formed it needs to be cleaned of lubricants, oils, greases and other substances used in its fabrication. Once the steel has been cleaned it must be passivated. Passivation is a process that treats metal surfaces with an acid solution to make the surface corrosion resistant.Passive to atmospheric ...

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The development course of spring material (Part 2)

日期： 2018-08-14

浏览次数: 38

nelson

(4) the development of stainless steel

China is a big country in the production of stainless steel. With the production and development of stainless steel, many varieties have been developed naturally. At present, more than 50 kinds of stainless steel have been developed, which basically meet the needs of domestic production and development, and a brief description of some new varieties developed at present.

1) the initial formation of austenitic stainless steel system. Low carbon austenitic stainless steel 0Cr18Ni9 and 00Cr17Ni2Mo2 have been developed to eliminate fatigue corrosion caused by carbon element. In order to improve its special properties, Cu, Ti, Nb, Mn, Cr, Si and N elements can be added.

2) the development of nitrogen containing stainless steel. The results of nitrogen generation of carbon in stainless steel were achieved. N and C have many common characteristics in austenitic stainless steel. The effect of N stable austenite is larger than that of Ni, which is equal to that of C. The combination of N and Mn can replace the more expensive Ni.

N is also one of the most effective solid solution strengthening elements in austenite. The affinity between N and Cr is less than that of C and Cr, and austenitic steels rarely see the precipitation of Cr2N. Therefore, N can improve the strength of stainless steel without decreasing the corrosion resistance.

The development course of spring material (Part 2)

3) the development of super ferritic stainless steel. Ferritic stainless steel has good corrosion and oxidation resistance, and its stress corrosion resistance is better than that of austenitic stainless steel. The price is cheaper than austenitic stainless steel. However, the disadvantages of poor weldability and brittleness tend to be limited, and the production and use are limited. The weldability and brittleness of ferritic steel can be improved by reducing the content of carbon and nitrogen in steel and adding the stabilizing elements such as Ti, Nb, Zr and Ta, and adding three kinds of metal toughening elements such as Cu, AI and V.

4) the development of super austenitic steel. The content of super austenitic steel Cr, Mo and N is significantly higher than that of conventional stainless steel. The more famous one is the steel containing 6% Mo (245SMo). This kind of steel has very good local corrosion resistance. Under the condition of sea water, gas, crevice and low speed scour, it has good resistance to pitting (PI 40) and good resistance to stress corrosion. It is a substitute for Ni based alloy and titanium alloy.

5) the development of super martensitic stainless steel. The traditional martensitic stainless steel 2Cr13, 3Cr13, 4Cr13 and 1Cr17Ni2 lack sufficient ductility, and the corresponding force is very sensitive during the cold deforging process, and cold forming is difficult. In addition, the weldability of steel is relatively poor, and the application scope is limited. In order to overcome the above shortcomings of martensitic steel, an effective way has been found recently, which is to develop a new series of alloy steel super martensitic steel by reducing the content of C and Ti and increasing the content of Ni. This kind of steel has high tensile strength, good ductility and improved welding performance, so super martensitic steel is also called soft martensitic steel or weldable martensitic steel.

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