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We’ll be the exhibitor of Manufacturing world Japan 2018 in Tokyo from June 20-23.

2018 - 04 - 18

To develope the new customer and enhance the exist business relationship, we’ll be exhibiting at the 22th MechaniceComponents&Material Technology Expo(M-Tech) in Tokyo Japan from JUNE 20-23. Your visiting at that timeIs highly welcomed!

What is the salt spray test?

2018 - 07 - 26

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...

Material and characteristics of spring

2018 - 08 - 08

The spring is often subjected to variable load or impact load. In order to ensure that the spring can work permanently and reliably, the material must have high elastic limit and fatigue limit. At the same time, it should have enough toughness and plasticity and good heat treatment.Spring materials and properties can be consulted in relevant manuals, specifications and standards (GB/T129.6-92, GB4357-89). The common spring steel is mainly:1: carbon spring steelThis kind of spring (such as 65, 70 steel, etc.) has the advantages of cheap price, convenient source of raw materials, low elastic lim...

Inspection content and specification for spring parts(part 7)

2018 - 08 - 20

8.3.3 test machine should have the following functions: test time or preset function;Dynamic timing or counting function; test amplitude display or control function; automatic stop function.Evaluation of 8.4 spring fatigue test results8.4.1 fatigue life determination: under a given failure condition, the measured spring reachesThe maximum cycle number is the fatigue life of the spring.Verification of 8.4.2 fatigue life: if the number of cycles is tested, if the spring does not failThe validation test proved that the test was passed.8.4.3 reliability verification: according to the given reliabi...

Analysis of deformation prevention measures for heat treatment of metal spring

2018 - 09 - 04

There are two types of heat treatment deformation: one is the size change, the other two is the change of part geometry. Different methods of heat treatment, deformation and deformation prevention of parts size and geometry are also different.The longer the holding time and the higher the temperature are, the more carbon is dissolved into austenite and the larger the expansion of martensite is. The expansion of martensite is the largest, followed by upper bainite, and the volume change of lower bainite and troostite is very small. At low temperature tempering, martensite shrinks and the amount...

Hardness testing method for tempering heat treatment

2018 - 09 - 17

Hard inspection method for chemical heat treatment and surface quenching and temperingSurface heat treatment is divided into two categories, one is chemical heat treatment and the other is surface quenching and tempering heat treatment. The hardness test method is as follows:1. Chemical heat treatmentChemical heat treatment is to make the workpiece surface infiltrate one or several chemical elements of the atom, thereby changing the workpiece surface chemical composition, organization and performance.After quenching and tempering, the surface of the workpiece has high hardness, wear resistance...

Matters needing attention when choosing custom spring

2018 - 09 - 27

In order to make it convenient for customers to buy and custom spring, some brief introduction about spring and specification parameters are summarized as follows:The common spring can be classified as: stretching spiral spring, compression spiral spring and torsion spiral spring.Among them, stretch and compression springs are mostly produced in quantity, with complicated specifications but suitable for slight modifications. If a small amount of springs is needed and the characteristics of springs are not critical, they can be purchased easily in the market with a higher unit price.The users o...

Spring manufacturing process

2018 - 10 - 12

There are many ways of making spring, but the main forming part is cold forming and hot forming.In spring in the cold forming process, the spring mainly made by oil material toughening, lead bath quenching tempering spring wire, cold drawn wire, etc., using this kind of material in the manufacturing process of spring generally do not need special heat treatment and only requires the stress relieving, adopted by the spring design work stress and material performance.Spring cold forming process is generally suitable for special-shaped spring with small line diameter or more complicated shape, su...

Wire forming spring

2018 - 10 - 23

Wire forming spring is a mechanical part that uses elasticity to work. It is usually made of spring steel. It is used to control the movement of machine parts, to mitigate impact or vibration, to store energy and to measure the magnitude of force. It is widely used in machines and instruments.The spring is just an accumulator. It has the function of storing energy, but it can not release the energy slowly. To realize the function of releasing slowly, it should be realized by "Spring + large transmission ratio mechanism", which is common in the mechanical meter.Spring is a kind of ela...

NEW INFORMATION / More

We’ll be the exhibitor of Manufacturing world Japan 2018 in Tokyo from June 20-23.

2018 - 04 - 18

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...

Steps of hardware spring pressure test

2018 - 08 - 30

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...

Method of spring-surface paint

2018 - 09 - 12

There are many methods of construction of paint, most of which are used for springs in the following ways:(1) dip coating method dip coating method is to dip the spring into the paint groove, and then take out, and let the excess paint on the surface drip naturally. After drying, it is covered with paint film on the surface of the spring.The dip-coating method has high production efficiency and can be applied to mechanization and automation production.But the paint volatilizes quickly, the paint that contains heavy quality pigment and two component paint material (amine solidify epoxy paint, p...

Working characteristics of pressure spring

2018 - 09 - 25

Nowadays, with the development of science and technology, spring has become a very important hardware accessory in our life. Different products use different springs, and the longest used springs can be roughly divided into: pull spring, twist spring, press spring, disc spring and plate spring.The following features of a very practical tension spring:Many different products or hooks are used to guarantee the source of the tension of the tension spring. The tension spring works in the opposite way to the compression spring. The tension spring works in the opposite way when stretching or pulling...

Testing spring residual stress

2018 - 10 - 10

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 ...

Spring calibration process

2018 - 10 - 20

After the end face grinding, if the free height, perpendicularity, pitch and outside diameter of the spring do not meet the deviation specified in the pattern, the screw compression spring often needs to be corrected.Calibration operations are generally manual or semi-manual.The commonly used tools are: the spring with the metal wire above 4mm, multi-purpose manual pressure machine, splitting machine, press and so on;For springs with wire under 4mm, special tools, pliers and hammers with wedge edge are often used.Calibration is to use these tools to make the spring locally plastic deformation ...

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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The development course of spring material (Part 2)

日期： 2018-07-23

浏览次数: 37

(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.

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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