The torsion springs belongs to the spiral spring. The ends of the torsion spring are fixed to other components. When other components rotate around the center of the spring, the springs will pull them back to the initial position to produce torque or rotary force. The torsion spring can store and release angular energy or rotate the force arm around the middle axis of the reed to statically fix a device. These springs are usually close to the body, but there is a pitch between the reed rings to reduce friction. They produce resistance to rotating or rotating external forces. According to the application requirements, the rotating direction (clockwise or counterclockwise) of the torsion spring is designed to determine the rotation of the spring. Each circle or close around or separate around, can ‘(with torsion load spring axis at right angles). The end of a spring can be twisted into a hook or straight twist arm.
Torsion Springs Design
Torsion spring is extreme variants of spring, from single to double torsion spring and Irregular torsion spring, and the torsion bar deformation in molding design. Therefore, it is also difficult to master the necessary material for the torsion spring in the design.
(1) free length.
(2) control diameter: (a) outer diameter, (b) inner diameter, (c) inner diameter of the casing, or the outer diameter of (d) through the circular rod.
(3) wire size “line diameter”.
(4) material (type and grade).
(5) the number of cycles: (a) the number of the total circle and (b) dextral or left-hand.
(6) torsional force: the number of pounds that deflects to a certain angle.
(7) the maximum deflection (from the angle of the free position).
(8) the form of the end. 
Please indicate: material diameter (d), outer diameter (D), twist arm length (L), free height (Lo), and other geometric dimensions, such as T 1 T 2… T J) and the corresponding torsion angle and the corresponding (only)
There is more detail about the Calculation formula of torsion spring
Material of Torsion Springs
There are many types of material for torsion springs, such as carbon steel, stainless steel, music wire and so on.
You can check more details from following table
|Standard No||standard||Brand||Diameter specification (mm)||shear||Recommended hardness HRC||Recommended||performance|
|name||Modulus G (MPa)||Temperature ℃|
|GB||Carbon spring steel wire||25～80||Grade B: 0.08~13.0||79000||–||-40～130||High strength, good performance.Class B, C and D are used for low, medium and high stress springs respectively|
|4357||40Mn～70Mn||Grade C: 0.08~13.0|
|Level D: 0.08~6.0|
|GB||Piano wire||60～80||Group G1: 0.08 ～ 6.0||79000||–||-40～130||High strength and good toughness.For important small springs, Group G2 is stronger than Group G1, and Group F is mainly used for valve springs|
|4358||T8MnA～T9A||Group G2: 0.08 ～ 6.0|
|60Mn～70Mn||Group F: 2.0 ～ 5.0|
|GB||Oil quenched and tempered carbon spring steel wire for valves||65Mn||2.0～6.0||79000||–||-40～150||High strength, good performance.For internal combustion engine valve spring or similar spring|
|GB 4360||Oil quenched and tempered carbon spring steel wire||55、60、60Mn、65、65Mn、70、70Mn、75、80||Class A, Class B||79000||–||-40～150||High strength, good performance.It is applicable to springs for common machinery.Class B has higher strength than Class A|
|GB||Oil quenched and tempered silicon manganese spring steel wire||60Si2MnA||Class A, B, C||79000||–||-40～200||High strength and good elasticity.Easy to decarburize, used for high load springs.Types A and B are used for general purpose springs, and types B and C are used for automobile suspension springs|
|GB||Oil quenched and tempered chromium silicon spring steel wire for valves||55CrSi||1.6～8.0||79000||–||-40～250||With strong fatigue strength, it is used for high stress internal combustion engine valve springs or other similar springs at higher operating temperatures|
|GB||Oil quenched and tempered chrome vanadium spring steel wire for valves||50CrVA||1.0～10.0||79000||–||-40～210||ditto|
|GB||Silicon manganese spring steel wire||60Si2MnA||1.0～12.0||79000||45～50||-40～200||High strength, good elasticity and easy decarburization.Larger springs for general machinery|
|GB||Chromium vanadium spring steel wire||50CrVA||0.8～12.0||79000||45～50||-40～210||Stable strength performance at high temperature, used for springs at high temperature, such as valve springs of internal combustion engines|
|GB||Chromium vanadium spring steel wire for valves||50CrVA||0.5～12.0||79000||45～50||-40～210||ditto|
|GB||Chromium silicon spring steel wire||55CrSiA||0.8～6.0||79000||45～50||-40～250||Stable strength performance at high temperature, used for high stress spring at high temperature|
|YB(T)||Stainless steel wire for spring||Group A:||whole||71000||-200～300||Corrosion resistant, high and low temperature resistant, small spring used for working under corrosion or high and low temperature conditions|
|Group B: 1Cr18Ni9|
|Group C: 0Cr17Ni8Al|
|GB||Silicon bronze wire||QSi3-1||0.1～6.0||41000||HB90～100||-40～120||It has high corrosion resistance and antimagnetic performance.Elastic elements for machinery and instruments|
|GB||Tin bronze wire||QSn4-3||0.1～6.0||40000||HB90～100||-250～120||It has high wear resistance, corrosion resistance and antimagnetic performance.Elastic elements for machinery and instruments|
|GB||Beryllium bronze wire||QBe2||0.03～6.0||44000||37～40||-200～120||It has high wear resistance, corrosion resistance, antimagnetism and conductivity.Precision elastic elements for machinery and instruments|
|GB||Hot rolled spring steel||65Mn||5～80||78000||45～50||-40～120||Good elasticity, used for ordinary mechanical springs|
|1222||55Si2Mn||5～80||78000||45～50||-40～200||With high fatigue strength and good elasticity, it is widely used in springs for various machines, vehicles, etc|
|55CrMnA||5～80||78000||47～52||-40～250||Good elasticity, high temperature resistance, used for larger springs bearing heavy loads|
|50CrVA||5～80||78000||45～50||-40～210||High fatigue strength, high temperature resistance.For larger springs at higher operating temperatures|
A torsion springs is a mechanical part that uses elasticity to work. It is usually made of spring steel. The size is used to control the mechanical movement, easing impact or vibration, energy storage, power measurement is widely used in computer, electronics, household appliances, instruments, cameras, door, car, motorcycle, harvester, etc. industries. The main production equipment: digital control multifunctional computer spring machine, automatic spring coiling machine, spring grinding machine, heat treatment equipment, large coil spring production line, quality testing instrument.
Torque spring is a high-precision spring accessory that cannot be processed at 1800 degrees using ordinary spring machines. Generally, universal spring machines are used both domestically and internationally to produce torque springs, with high accuracy. Universal springs can achieve forming and positioning of different angles and shapes. It is a relatively universal CNC universal machine and fully automatic production equipment
The main functions of the universal spring machine
A widely used elastic component in the spring machine and electronics industry. Springs can generate significant elastic deformation when subjected to load, converting mechanical work or kinetic energy into deformation energy. After unloading, the deformation of the spring disappears and returns to its original state, converting deformation energy into mechanical work or kinetic energy.
- In a universal spring machine, springs control the movement of machinery, such as valve springs in internal combustion engines and control springs in clutches.
- The spring in a universal spring machine absorbs vibration and impact energy, such as buffer springs under cars and train carriages, and vibration absorbing springs in couplings.
- In a universal spring machine, springs store and output energy as power, such as clock springs and springs in firearms.
- In a universal spring machine, the spring is used as a force measuring element, such as a force measuring device or a spring in a spring scale. The ratio of the load to deformation of the spring is called spring stiffness, and the greater the stiffness, the harder the spring