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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...
2
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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)  ...
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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...
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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 ...
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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...
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2018 - 09 - 22
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2018 - 10 - 09
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8
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...
9
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...
NEW INFORMATION / More
1
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...
2
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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...
3
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...
4
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...
5
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...
6
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...
7
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...
8
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...
9
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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Coil extension, torsion spring manufacturing

日期: 2018-11-02
浏览次数: 544
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Cylindrical spiral spring structure

There are three types of cylindrical spiral spring:

1. Cylindrical spiral compression spring

1) spacing between springs

Let the spring's pitch be p;The diameter of the spring wire is d;In the free state, there should be proper spacing between the circles.In order to make the spring still maintain a certain elasticity after compression, it is also necessary to ensure that there is a certain gap of 1 between each circle under the maximum load.The size of lens 1 is generally recommended to be: in addition 1=0.1d or greater than 0.2mm

2) dead circle

The two ends of the spring are closed with the adjacent ring (no gap), which only supports the spring without deformation.When the number of working rings of the spring is less than or equal to 7, the dead ring at each end of the spring is about 0.75.When n BBB 0 7, the dead ring at each end is about 1 ~ 1.75 turns.

3) end structure

YI type: both end face rings are tightly connected with the adjacent ring and are ground flat on the special grinding machine;

YII type: when the spring wire is heated and wound, both ends of the spring wire are forged flat and tightly connected with the adjacent ring (the end ring can be ground or not ground);

YIII type: both ends of the ring with the adjacent ring and do not wear smooth

In important cases, YI type should be used to ensure that the two supporting ends are perpendicular to the spring axis, so that the spring is not askew when under pressure.When the diameter of the spring wire is less than or equal to 0.5mm, the two supporting end faces of the spring need not be polished.For the spring of d BBB 0 0.5mm, the two supporting end faces shall be ground.The grinding part shall not be less than 3/4 of the circumference.The thickness of the end should not be less than d/8, and the roughness of the end surface should be less than

2.Cylinder coil drawing spring

1) end hook type

For easy connection, fixation and loading, the stretch spring is provided with a hook at both ends.

LI and LII hooks are easy to make and widely used.However, due to the large bending stress generated at the transition point of the hook, it is only suitable for the spring whose diameter of the spring wire is d or less than l0mm.

LVII and LVIII hooks are not combined with spring wires, so there are no disadvantages of the aforementioned transition. Moreover, the hooks can be turned to any direction for easy installation.It is better to use the LVII hook for heavy duty applications, but it is more expensive.

Coil extension, torsion spring manufacturing

2) stretch spring with prestress

When the cylinder coils are unloaded, the rings should be closed to each other.In addition, in order to save the axial working space, and ensure that the springs in the no-load time each ring compresses each other, usually in the winding process, and at the same time make the spring wire around its own axis to generate torsion.The spring made in this way, each ring has a certain pressure on each other, and a certain prestress is produced in the spring wire, so it is called.This kind of spring must be larger than the initial tension of F0, after each ring began to separate, so that no prestressed stretch spring can save the axial working space.

3. Spiral torsion spring

The torsion spring is provided with a lever arm at both ends for easy connection, fixation and loading:

The cylindrical spiral spring is manufactured

The manufacturing process of spiral spring includes: a) rolling;B) the making of the hook or finishing of the face ring;C) heat treatment;D) process test and strong pressure treatment.

Coiling is the winding of spring wire to the mandrel according to the technical requirements.In mass production, it is rolled on universal automatic spring coiler;Single piece and small batch production, in the ordinary lathe or manual winding machine winding.

There are two kinds of rolling: cold roll and hot roll.The cold coil is used for spring wire with diameter d<(8 ~ 10)mm drawn after pre-heat treatment.Stronger springs made of larger diameter spring filaments use hot coils.Hot coil when temperature varies with the thickness of the wire spring in the range of 800 ~ 1000 ℃.The pitch of the spring should be adjusted according to the specific situation, no matter using cold roll or hot roll.

After the above procedure, the spring should be heat treated.The surface of the spring after heat treatment should not have a significant decarburization layer.The spring after the cold coil is tempering only to eliminate the internal stress of the coil.

In addition, the spring must also carry out the process test and the test of precision, impact and fatigue according to the technical conditions of the spring to check whether the spring meets the technical requirements.It should be noted that the durable strength and impact strength of the spring depend to a large extent on the surface condition of spring wire, so the spring wire surface must be smooth and clean without defects such as cracks and scars.Surface decarburization will seriously affect the material's lasting strength and impact resistance.Therefore, the depth of decarburization layer and other surface defects shall be specified in the technical conditions for the acceptance of spring.Important springs shall also be treated with surface protection (e.g. galvanized);A common spring is usually painted with oil or paint.

For important springs, there is also a strong pressure treatment.In order to generate plastic deformation and residual stress in the critical area of the spring wire section, the spring is loaded continuously for 6 ~ 48 hours under the action of ultimate load.Because the residual stress is opposite to the working stress symbol, the maximum working stress of the spring treated with strong pressure is small.If treated by shot peening, increase by 20%.However, springs used in long term vibration, high temperature and corrosive media, as well as springs in general use should not adopt this strengthening process.

Spiral drawing and torsion spring manufacturing, except a few manufacturers in the introduction of foreign CNC CNC spring forming machine last automatic forming process various types of stretch, torsion spring.Most manufacturers still use traditional processing methods to manufacture, now a simple introduction.

1. Coil stretching spring.The process is basically the same as that of the spiral compression spring, except the hook ring processing at the end. The forming method of the stretching spring is as follows:

1) the same method as the screw compression spring is used to conduct de-stress annealing after winding forming, and then the hook ring is processed. In addition to the special shape of the hook ring or the spiral stretching spring with high initial tension is used for lathe winding or manual rolling, most of the springs are rolled by automatic spring winding machine.Coil extension, torsion spring manufacturing

2) coil with straight end spring machine.It is a vertical vertical spindle winding machine.After rolling, de-stress annealing and then hook and ring processing.The end structure of coiled stretch spring has many forms and processing methods.Commonly used are: small spring using plier-type special tools or special process equipment for manual processing;The normal spiral stretching spring is processed by the hook or die by manual or automatic operation.The stretching spring of the long arm hook ring is usually the length of material needed for the draw hook to be left out when winding, or the number of rings needed for processing after winding, the two ends are straightened with the straightening tool, and then the hook ring is bent with the special tool.The process specification for de-stressing annealing is described above.After the spring coiling is done, stress relief annealing is carried out first, and then cut off and hook ring processing is carried out. After the hook ring processing is completed, the stress relief annealing should be carried out one or two times in general.In order to prevent two carabiners relative Angle changes, therefore, when the stress relieving to shackle is processed temperature is better than rolling after the low temperature of 20 ~ 30 ° C.Coiled extension springs are generally not shot blasting and tension treatment.

2. Spiral torsion spring.Its craft and spiral compression, tensile spring are basically the same, different embedded instant kang also raise agent ぁ?In the case of small batch production and complicated torsion arm, most of the torsion arm is formed by manual or semi-automatic winding spring method, and then the torsion arm is processed according to the pattern requirements with the jig.In the mass production, it can be rolled on the straight-tail coil spring machine and the special machine for torsion spring. If the torsion arm cannot be completed according to the pattern, it can be processed by the work installation and clamping device.According to the characteristics of the helical torsion spring, the following two points should be noted in the design and manufacture:

1) the twist arm of the end of the spiral torsion spring shall be bent once during manufacturing to avoid machining defects and correct shaping.The second stress relief annealing should be carried out after the torsion arm processing.

2) the current helical torsion springs are mostly close coils, in this way, a compressive force similar to the initial tension of the stretching spring is generated between the spring coils. Friction will be generated during loading and unloading, and hysteresis will occur.It also brings difficulties to the surface treatment process.Therefore, in the design and forming, the spring coil should be slightly left between the gap.In mass production, under conditions, the manufacturer can adopt hydraulic and pneumatic methods to process the spiral drawing, torsion spring expansion, bending and hook.


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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...
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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...
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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...
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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...
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