HOT INFORMATION / More
1
2018 - 07 - 31
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...
2
2018 - 09 - 20
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...
3
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 spr...
4
2018 - 04 - 18
To grow the business, we need to develop management expertise and innovation across the team.Thia is the picture of AFR team development activity in one of the shenzhen beach, From the faceof young team,  we can see the confidence and what they want to achieve!
5
2018 - 09 - 05
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 ...
6
2018 - 10 - 25
The technological process of helical springs refers to the process of converting spring materials into finished springs, which flow through every process in sequence. Because of the spring material, the spring type and the processing method are different, the technological procedures of the spiral spring are also different. However, their basic technological processes are coil spring heat treatment end processing surface treatment.Next, introduce several typical processes.1. manufacturing compressed spiral spring with cold drawn spring steel wireFor the lathe coil spring, after the winding spr...
7
2018 - 08 - 16
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...
8
2018 - 10 - 10
In recent years, the surface of the spring has been treated by the spring designers.The finishing (finishing) process is to put the spring directly into a series of finishing machines, such as tilting centrifugal type or spiral vibrating type, eddy current type, and add appropriate grinding materials, grinding agents and water for finishing.General optical finishing is about 20 to 30min. Specific optical finishing time depends on the spring shape and the amount of device.After finishing the finish, remove the spring and rinse it with tap water, then immerse in the SM series water film replacem...
9
2018 - 07 - 31
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...
NEW INFORMATION / More
1
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...
2
2018 - 09 - 28
The diameter of wire wound by automatic spring machine is 0.2-3mm, and the adjustment process is as follows:1. Calibrate the feeding roller and winch to fit the diameter of steel wire and install the pitch wedge and cutting knife.2. Insert the steel wire into the spring machine and press the pressure plate and feeding roller.3. Adjust the distance of winding xiao zi, control the diameter of spring, and adjust the pitch wedge and xiao zi Angle to control the spring pitch and parallel head.4. Install an appropriate cutter, adjust the feeding CAM according to the spring expansion length, cut off ...
3
2018 - 04 - 18
To grow the business, we need to develop management expertise and innovation across the team.Thia is the picture of AFR team development activity in one of the shenzhen beach, From the faceof young team,  we can see the confidence and what they want to achieve!
4
2018 - 09 - 13
The surface of steel is hardenedIn some parts, the surface layer of the workpiece bears higher stress than the core under the action of alternating loads such as torsion and bending and impact loads.In the case of friction, the surface layer is also constantly worn. Therefore, high strength, high hardness, high wear resistance and high fatigue limit are put forward for some surface layer of parts. Only surface strengthening can meet the above requirements.Because surface quenching has the advantages of small deformation and high productivity, it is widely used in production.According to differ...
5
2018 - 11 - 03
In the transmission mechanism of the press, when the clutch and the brake adopt mechanical rigid interlock, as long as the air is set on the clutch.The cylinder, the air pressure ACTS on the piston of the cylinder to make the clutch friction pair fit, and to make the air pressure of the spring brake brake friction pair separate and not brake, so when the air cylinder enters, the brake friction pair should be separated first, and then the clutch friction pair fits to complete the combination.The friction pair separation of the clutch and the friction pair fitting of the brake are respectively a...
6
2018 - 08 - 25
Like most other basic mechanisms, metal springs have existed for a long time in the bronze age. Even for metals, wood is used as a structural member of flexible bow and arrow and military catapult. In the Renaissance, precise clocks made precision springs the first necessity. In Fourteenth Century, we saw the precise clock of revolutionary astronomical navigation developed. The world's exploration and conquest of European colonial powers continue to provide impetus for watchmakers "science and art." The other area of the firearm promotes the development of the spring. At the dawn of ...
7
2018 - 10 - 18
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 called brittle ...
8
2018 - 08 - 08
Springs can also be classified by how they’re made. The first spring that comes to most people’s minds is probably a metal coil spring, also known as a helical spring. However, there are many other types. Even an elastic band can be considered a variable rate spring, since it stores mechanical energy. Coil SpringsLightweight coil springs are made by forming metal wires on an CNC coiling machine. The multi-axis CNC control allows you to create variable pitches and end conditions only limited by your imagination. Springs that come off the coiling machines do not have springy properties. They nee...
9
2018 - 09 - 28
The special-shaped spring contains spring clip, tension spring and torsion spring, and the generalized special-shaped spring also includes snake spring, corrugated spring, bar spring and other complicated springs.Special-shaped spring is the basic part with wide application range and multifarious variety in automobile, motorcycle, electric appliance and instrument products. Its quality and life directly affect the performance of main engine products.Hyundai has made it a key component.Over 90% of special-shaped springs at home and abroad are made of two kinds of materials: lead quenched carbon...
CONTACT US / More
hotline
86-755-28903525
Room 816, RongChao Financial Center, No 52, RuYi Road,LongCheng Street, LongGang District, ShenZhen,China.

Spring material selection method

日期: 2018-09-26
浏览次数: 28
Daisy

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 springs, should be preferentially used steel wire, cold-drawn steel wire such as strengthened steel wire, lead bath and oil hardened tempered steel wire, which has higher strength and good surface quality, higher fatigue performance than ordinary tempered tempered steel wire, simple processing, good technology and stable quality.

The carbon spring steel wire and the piano steel wire produced large residual stress after cold drawing. After processing the spring, there was large residual stress, and the size changed greatly after tempering, so it was difficult to control the dimensional accuracy.Oil hardened tempered steel wire is modulated and strengthened after steel wire is drawn to the specified size. Basically, there is no residual stress. After forming spring is tempered at low temperature, the size change is very small, and the heat resistance is better than that of cold-drawn reinforced steel wire.

For large and medium sized springs, cold drawn materials or polished steel after cold drawn shall be used for those with higher load accuracy and stress.Hot rolled steel can be used for spring with low loading accuracy and stress.

The steel plate spring is usually made of 55Si2Mn, 60Si2MnA, 55SiMnVB, 55SiMnMoV, 60CrMn, 60CrMnB and other grades of flat steel.

For the material section of spiral spring, circular section should be preferred.Square and rectangular materials have strong bearing capacity, good impact resistance, and can make the spring miniature, but the sources of materials are few.And the price is higher, except special need, do not choose this kind of material as far as possible commonly.In recent years, the circular steel wire is developed to replace the trapezoidal steel wire.

Spring material working under high temperature requires good thermal stability, resistance to relaxation or creep, oxidation resistance and corrosion resistance to certain medium.Spring material selection method

As the working temperature of the spring increases, the elastic modulus of the spring material decreases, resulting in lower stiffness and less load bearing capacity.Therefore, the spring working at high temperature must understand the change rate (value) of the elastic modulus and calculate the impact of the decline of the spring's load capacity on the performance.According to the regulations of the GB1239, ordinary helical spring working temperature above 60 ℃, a modification should be made for the shear modulus, its formula is: Gt = G in the KtG type - room temperature modulus of elasticity;Gt -- shear modulus at operating temperature t;Kt -- temperature correction coefficient is selected according to table 2 -- 98.

The spring material used at low temperature shall have good low temperature toughness.Carbon spring steel wire, piano steel wire and 1Cr18Ni9 austenitic stainless steel spring steel wire, copper alloy and nickel alloy have good low temperature toughness and strength.

At low temperature, the brittleness of the material is very sensitive to surface defects.

At low temperatures, the environmental medium is much less corrosive to the material than in a greenhouse, and cadmium plating and galvanizing can easily cause cold brittleness.

At low temperature, the elastic modulus and expansion coefficient of the material do not change much.

The spring made of spring steel, hardness (that is, strength) should be selected according to the load bearing property and stress.However, the degree of hardness is strongly related to the plane strain fracture toughness.

As the hardness increases, the plane strain fracture toughness (KIC) value decreases significantly.That is to say, when determining the spring's hardness value, the spring's hardness value should be lower on the premise of satisfying the spring's characteristics.

When selecting spring material, pay attention to the hardenability of steel.Whether or not the cross section of the spring material is quenched and the degree of quenching is very important to the spring mass.

Electrical springs that use the spring itself as a conductor or work in conditions of varying humidity, such as water (including seawater) and water vapor, are generally made of copper and gold.

Springs operating under acid contact and other corrosive media generally use corrosion resistant materials such as stainless steel or nickel alloy.The spring used under general environmental conditions is made of ordinary spring steel, which is then coated with rust or plated (galvanized, cadmium plated and copper plated) on the surface to prevent corrosion.

In order to satisfy the requirement that the precision of the spring used in the weighing apparatus and instruments is not affected by the temperature change, the constant elastic alloy with minimum elastic modulus and expansion coefficient is generally selected.

In the requirements of light, insulation, anti - collision, corrosion and other special use of spring, can choose reinforced plastics.At present, the more suitable plastic spring is epoxy resin, phenolic resin as the matrix, glass fiber reinforced thermosetting reinforced plastic GFRP.Also may choose the vibration - proof rubber manufacture each kind of rubber spring.


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...
Related products / Products
  • 发布时间: 2018 - 04 - 08
    Precision Torsion Spring:Description: wire diameter ranged from Φ0.10-Φ14mm, minimum spring convolution: 3•Various materials: music wire,galvanised wire, carbon wire,stainless steel wire, copper, beryllium copper wire, and more•Various torsion arms•Single torsion, double torsion and multi-torsion•Torsion in different direction•Applications: all kinds of cars, machines, electronic products,electric appliance, cameras, stationery, computers, power switches,miniature switches, architecture, commodity and home appliance, A/Vequipment, hardware and plastic molds, sports equipment and gifts
  • 发布时间: 2018 - 04 - 08
    拉伸弹簧
    Precision Extension spring:Description: wire diameter ranged from Φ0.08-Φ14mm, minimum spring convolution: 2.7, hook style can be customized per customer’s requirement•Spring loops and hooks vary in different shapes•Changeable diameter•Advanced manufacturing and testing equipment•Made of standard material•Applications: furniture, electronic products, electric appliance, architecture, commodity and home appliance, sports equipment and gifts
  • 发布时间: 2018 - 04 - 08
    异形弹簧
    Auto wire forming Spring:Description: CNC forming, maximum feeding error:0.05mm,wire diameter ranged from 0.08-14mmAUTO Wire Formings and Clasps, Round, Flat and Square Wire Types are Available•Produced by specific clasp formers•Round wire, flat wire and square wire•Advanced manufacturing and testing equipment•Exported directly•Standard material•Responsive service•Applications: all kinds of cars, machines, electronic products,electric appliance, cameras, stationery, computers, power switches,miniature switches, architecture, commodity and home appliance, A/Vequipment, hardware and plastic moul...
  • 发布时间: 2018 - 04 - 08
    CD盖弹簧、电器按钮弹簧、剃须刀弹簧等…
    For household applicancedDescription: wire diameter ranged from Φ0.10-Φ14mm, minimum spring convolution: 3Various materials: music wire,galvanised wire, carbon wire,stainless steel wire, copper, beryllium copper wire, and moreVarious torsion armsSingle torsion, double torsion and multi-torsionTorsion in different directionApplications: all kinds of cars, machines, electronic products,electric appliance, cameras, stationery, computers, power switches,miniature switches, architecture, commodity and home appliance, A/Vequipment, hardware and plastic molds, sports equipment and gifts
  • 发布时间: 2018 - 04 - 20
    Bttery shell stamping parts
Copyright ©2018 AFR PRECISION TECHNOLOGY CO,LTD
Xiniuyun Providing enterprise cloud services
在线聊天
live chat
-->
客户服务
live chat