|Place of Origin:||China|
|Minimum Order Quantity:||1000 Pieces|
|Packaging Details:||Carton+ Wood box|
|Payment Terms:||T/T, D/P, L/C, Western Union|
|Supply Ability:||1000000 Piece/Pieces per Month According to the order|
|Wire Diameter:||0.06mm~15mm||Material:||Stainless Steel|
|Packing:||Carton+ Wood Box||Height:||Custom|
108mm Extension Coil Springs,
300kg Capacity Extension Coil Springs,
108mm heavy duty extension springs
300kg Weight Capacity Sturdy Steel Extension Springs For Hammock Swing Chair 108mm Springs
Product introduction: Tension springs (also called tension springs, referred to as tension springs) are coil springs that bear axial tension. Tension springs are generally made of round cross-section materials. When not under load, the coils of the tension spring are generally tight and there is no gap.
The two ends are divided into a variety of specifications such as with hook, without hook (protective cover), with pull ring or one with hook and one with tension spring.
Model and material: customized or designed according to user drawings
Extension Springs product attributes
|Material||Spring Steel wire,304/303/316Stainelss Steel,Music wire,copper wire, Phosphor bronze Wire or any available wire.|
|Finishing||End rounding,polishing, electrochemical polishing etc.|
|Application field||Electronic spare part,furniture parts,cellphone parts,auto hardware parts,gym equipment fittings ,etc.|
Anodizing, Polishing, Powder coating, Passivation, Sandblasting, Nickal plating,
Zinc plating, Chrome plating, Heat treatment, Oxidation
Electronic, auto, electric appliance, electrical machine, toy, medical treatment,
loudspeaker box, furniture and fitness equipment and other industries.
|Design||According to customer drawing or sample|
CNC spring machines,CNC punching machines, CNC milling machines, CNC turning machines,
CNC machining center, Automatic lathes, Linear cutting, Grinding machine etc.
|Standard||JIS, DIN, ANSI, EN, etc.|
|Tolerance||0.005mm - 0.01mm|
|Surface Roughness||Ra 1.6 -3.2|
Foam polybag + Outer -Standard Carton Box/Carton Box with Pallet
+ Stretch Film
|Software||Auto CAD, Solid work, UG: PDF, DWG, DXF, IGS, STEP, SLDPRT|
Application of Extension Springs
Long-term use will cause changes in the shape and performance of the extension spring. If it has been under certain conditions, the extension spring may undergo qualitative changes due to external conditions. Generally there are the following situations:
1. Wear of the extension spring:
Wear is divided into: abrasive, fatigue and corrosion wear fracture.
2. Brittle fracture:
Most of the spring fractures are brittle fractures. Only when the working temperature is high, can plastic fracture occur. In engineering, fatigue fracture, stress corrosion fracture and hydrogen embrittlement fracture are called brittle fracture.
3. Fatigue fracture of tension spring:
The spring breaks under cyclic loading.
4. Hydrogen embrittlement, cadmium embrittlement, black embrittlement:
Brittle fracture caused by excessive impurities in the spring material.
5. Corrosion fatigue fracture:
The tension spring breaks under the combined action of cyclic load and corrosive medium.
6. Stress corrosion fracture:
The tension spring breaks under the combined action of tensile stress and corrosive media.
How to choose spring material
The choice of spring material should be determined according to factors such as the nature of the spring load, the stress state, the magnitude of the stress, the working temperature, the environmental medium, the service life, the requirements for conductive and magnetic conductivity, process performance, material source and price. When determining the material profile
The choice of spring material should be determined according to factors such as the nature of the spring load, the stress state, the magnitude of the stress, the working temperature, the environmental medium, the service life, the requirements for conductive and magnetic conductivity, process performance, material source and price.
When determining the cross-sectional shape and size of materials, the series of sizes specified by national standards and ministerial standards should be selected first, and materials with non-standard series specifications should be avoided as far as possible.
Small and medium-sized springs, especially spiral tension springs, should be given priority to steel wires that have been strengthened, lead bath isothermal cold drawn steel wires and oil-quenched tempered steel wires, which have higher strength and good surface quality, and their fatigue performance is higher than that of ordinary quenching. Tempered steel wire, simple processing, good manufacturability and stable quality.
Carbon spring steel wire and piano steel wire produce large residual stress after cold drawing. After processing the spring, there is a large residual stress, and the size changes after tempering, which makes it difficult to control the dimensional accuracy. Oil-quenched and tempered steel wire is modulated and strengthened after the steel wire is drawn to the specified size. There is basically no residual stress. After the spring is formed, it is tempered at low temperature, the size change is small, and the heat resistance stability is better than cold drawn Strengthen the steel wire.
Custom Extension Springs
When you require a special spring design, our design specialists will assist you in ordering custom extension springs. We will work with you to make sure that your custom extension springs meet all of your needs and work within your budget. As an experienced expert in the manufacture of extension springs, HuiHuang can work from new or existing custom designs to deliver the extension springs you need
Design process of spring
Device space: To design a compression spring, you must clearly understand the space required for the device spring to effectively master the basic manufacturing conditions of a compression spring, such as outer diameter, inner diameter, and free length.
Activity stroke load: The design of the compression spring must clearly understand the position to be moved and the required elastic force. Determine the position and understand the required elasticity, and then determine the material, wire diameter, and number of turns.
Environmental factors: Springs operating in different environments will be affected by environmental factors, which will affect their service life. Therefore, the designer must consider the changes in ambient temperature and humidity. Temperature has a great influence on the life of the spring, and humidity is easy to cause The spring without surface treatment is oxidized. Therefore, environmental factors can determine whether the spring needs surface treatment and material selection.
The distance between the two ends: the two ends of the tension spring will affect the form of the hook and the free length of the tension spring. The space can determine the size and outer diameter of the adhesion part.
Pre-tensioning load: The pre-tensioning load determines the material and wire diameter of the spring, and the size of the adhesion part can be adjusted for the pre-tensioning length.
The outer diameter of the mandrel: The inner diameter of the torsion spring is determined according to the size of the mandrel, but the change of the spring body after twisting needs to be considered, so a proper margin must be reserved.
The inner diameter of the device space: If a torsion spring device adopts the recessed type, the recessed space must be considered. The space determines the outer diameter, free length and number of turns of the spring body.
Torsion fulcrum: There must be a point when the torsion spring does work, and this point can determine the length and form of the torsion bar.
The starting and ending point of the action: the angular position of the torsion bar with the fulcrum when it is not doing work. The length, form and angle of the torsion bar with the fulcrum can be clearly specified.
The distinction between compression spring, extension spring and torsion spring
Compression spring (compression spring) is a helical spring that bears axial pressure. The material used in it is mostly circular in cross section, and it is also rolled with rectangular and multi-strand steel. The spring is generally of equal pitch. The shape of the compression spring is : Cylindrical, conical, convex and concave shapes, and a small amount of non-circular shapes, etc. There is a certain gap between the coils of the compression spring, and the spring shrinks and deforms when subjected to an external load to store deformation energy.
Extension springs (tension springs) are helical springs that bear axial tension. Extension springs are generally made of round cross-section materials. When not under load, the coils of the tension spring are generally tight and there is no gap. Work with the resilience (tension) after stretching to control the movement of parts, store energy, measure the size of the force, etc. It is widely used in machines and meters. The hook forms include side hook extension spring, long hook extension spring, British hook extension spring, German hook extension spring, semicircular hook extension spring, duckbill hook extension spring, etc. The materials are stainless steel, piano steel, high carbon Steel, phosphor bronze, oil tempered alloy spring steel, etc.
Torsion springs (torsion springs) use the principle of leverage to twist or rotate elastic materials that are soft and tough to make them have great mechanical energy. It is a spring that undergoes torsional deformation, and its working part is also surrounded by tightly or separately. The end structure of the torsion spring is processed into torsion arms of various shapes, from single to double torsion, and even the deformation of various torsion bars, which can be shaped according to design. Torsion springs are often used in balancing mechanisms in machinery and are widely used in industrial production such as automobiles, machine tools, and electrical appliances.
Product packaging: generally a certain number of transparent plastic bags, and then by the carton packaging.Of course, if you have special requirements, we can also meet them.We have several regular partners: Bosch, Petra, Hitachi, dicks, dongfeng electric, etc.We have experience working with customers from all over the world, such as the United States, India and Australia.So you don't have to worry about transportation as long as your products are in our production range.
Q: Are you a factory?
A: We are a 32-year-old factory, we pick up OEM orders.
Q: When can I get a quote?
A: We will quote you within 24 hours after receiving your inquiry. If you are in urgent need of price, please call us or let us know in your email address so that we can respond to your inquiry first.
Q: How to customize (OEM/ODM)?
A: If you have product drawings or samples, please send them to us and we can customize them according to your requirements. We will also provide our professional advice on products to maximize design performance..
Q:How long is your delivery time?
A: It usually takes 5~15 days, depending on the quantity you need. If time is urgent, you can arrange it.
How to choose a spring manufacturer? We can judge by inspecting the following 10 points of spring manufacturers:
1. Types of springs that can be produced.
Different types of springs require different production equipment. The more types that can be produced, the more complete the production equipment of the company.
2. Ask about the production accuracy of the spring.
The precision of producing springs represents the production technology capability of the spring factory. The higher the production precision, the more attention the spring factory pays to the quality of the products.
3. Whether there is a research and development team.
The R&D team is indispensable for an enterprise. The R&D team of the spring factory can make this enterprise develop in the direction of new processes and new technologies. ~Innovative ability
4. Whether the production equipment is imported.
Most of the domestic spring equipment is used to produce some non-important parts of the spring, the overall production accuracy is low, and there is a certain gap in product consistency. The higher the precision of the spring equipment, the higher the precision of the spring can be made.
5. Output of spring production.
The production output of springs represents the production capacity of this enterprise. The greater the production capacity, the stronger the supply capacity and the stronger the relative delivery guarantee.
6. Which manufacturers are the suppliers for?
As the saying goes, to marry a wife, you must choose the right person, and you also need to find a partner. For example, you are in the automotive industry, and Xinxiang Huispring Spring Co., Ltd. is a spring for the automotive industry. They directly supply the German Bosch company, so the product quality must be very guaranteed. This is very suitable for you. If you are making a ballpoint pen and you want an ordinary ballpoint pen spring, then this bright spring spring may not be suitable for you. You should choose an ordinary spring factory.
7. Whether there is a special testing department and whether the testing equipment is complete.
The inspection department is a necessary department of the spring enterprise. If no one supervises quality control, or quality control cannot use effective equipment for inspection, then no one would dare to use such products.
8. What is the defective rate of the spring produced? ,
The defective rate of springs of qualified spring manufacturers is generally between 5 and 12 parts per million. This data contains the data of nonconforming products detected by the manufacturer. The smaller the data, the stronger the accuracy and consistency of spring production.
9. Where are the raw materials of the springs purchased and whether they are inspected plate by plate.
The production process of the spring is very important, and the raw material of the spring is more important. For the same material, some material dealers sell it for 5 yuan, and some material dealers sell it for 10 yuan. Why is this? On the one hand, it is the consistency of the steel wire, such as some places where it is thick and some places, on the other hand, whether the composition of the spring material is evenly distributed and whether the content is qualified. The spring produced by unqualified spring raw materials is also unqualified, such as frequent breakage or deformation, and the spring load cannot be reached.
10. Whether it has the qualification certificate of the relevant industry.
For the spring industry, are some certificates very difficult to obtain, such as IATF16949 and GJB 9001C. These are very rare certificates. If this spring company has these qualifications, at least it proves to be very formal.
Finally, we still have to conduct on-site inspections and see how much the registered capital of this spring factory is, so as to avoid subsequent supply problems.