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 Extension Springs / Tension  Springs
 Torsion Springs
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 Retaining Ring
 Garter Springs
 Spiral Springs
 Induction Coils
 Springs Assemblies
 Valve Springs
 
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Compression Springs
We manufacture compression springs from Wire dia 0.1 mm to 12.5 mm.
 
A type of spring designed to compress and become smaller when pressed with compressive load. Compression spring normally refers to a coil compression spring.
 
The ends can be ground flat so that force is applied squarely to each end of the spring, reducing the tendency to buckle, or to accommodate accurate seating requirements and a reduced solid height that may be imposed by particular applications.
 
  Compression Spring Design Hints
 
1. Compression springs are the easiest type to make. Can be made more rapidly and accurately than other types and should be used in preference to other types wherever possible.
2. Avoid using open ends or open and ground ends. Such springs usually tangle when shipped. They also buckle when deflected.
3. Use closed ends only and avoid grinding whenever possible, especially on light wire sizes under 0.60 mm or where a large spring index Om/d prevails such as 13 or larger. Grinding is a slow and expensive operation.
4. Use conical springs when a short, solid height is needed and to reduce buckling.
5. Avoid using conical, barrel shaped, or other special shapes, where a standard helical spring could be used.
6. Design springs with a reasonably safe stress when compressed solid so that they may be adaptable to other installations.
7. Do not specify coiling right hand or left hand if it is not important. Specify right hand if it must be threaded onto a bolt. If a spring is used inside another, one spring should be wound left hand and the other right hand to avoid meshing of the coils.
8. Specify a force with a tolerance at an exact compressed height rather than a definite deflection. Testing instruments are designed to test force at specified heights. Specifying two or more force automatically determines a rate and should be avoided if possible, but is often necessary on important springs. The rate equals the difference in the two forces divided by the amount of deflection between those forces.
9. Three springs standing side by side will have a rate and solid force three times that of one spring.
10. The outside diameter of a compression spring increases and the outside diameter of an extension spring decreases when deflection occurs.
11. Avoid designing spring with spring index Dm/d below 4 and above 5.
   
Extension Springs
We manufacture compression springs from Wire dia 0.1 mm to 12.5 mm.
 
A type of spring designed to support tension, or pulling loads. Extension springs are also called tension springs.
 
The difference between helical compression and helical extension spring is in the direction of load application and the method by which it is applied.
 
In order to apply the force, special end form numbers have to be used, either utilizing the formed end coils or special hook.
 
The more complex the end formation the greater the manufacturing tolerances & greater the manufacturing cost.
   
  Extension Springs – Design Hints
 
1. Extension Springs are more expensive then compression springs and should be stressed about 10% to 15% lower to allow for overstretching at assembly and to reduce the stresses in the hooks
2. They should be designed with some initial tension to hold the coil together. Springs without initial tension are difficult to manufacture.
3. Do not specify the relative position of the hooks with regard to each other unless it is important. The spring manufacturer may have to vary the position a little to meet the more important force and deflection requirements. Avoid using large, extended or special hooks wherever possible, as they may double to triple the cost of spring.
4. Keep the outside diameter of a hook the same as the OD of the spring so that the hook can be made by bending up a regular coil. Do not specify the hook opening with small tolerances. Swivel hooks and coned ends helps to reduce hook breakage and are quiet expensive.
5. The body length or closed portion of an extension spring equals the number of coils in the body plus 1, multiplied by wire diameter.
6. Electroplating does not deposit a good coating between the coils nor on the inside diameter, but such springs should not be extended during plating as this causes a higher amount of hydrogen embrittlement.
7. Heating extension springs to remove residual stresses caused by coiling also may reduce the amount of initial tension by as much as 50%. Allowance for this reduction should be made in manufacturing.
8. When two or more forces are specified, they automatically determine the rate and the deflection. Testing for two forces is often expensive, time consuming & frequently can be avoided by proper design considering normal spring tolerances.
   
Torsion Springs
We manufacture compression springs from Wire dia 0.1 mm to 12.5 mm.
 
The mode of operation of torsion springs is different from compression springs and extension springs. At accurate springs, wide ranges of torsion springs are manufactured on CNC Machines.
 
A torsion spring is, in effect, a wound up cantilever. Torsion springs supply or withstand torque. To supply this torque, torsion springs require some from of spring leg. The type of spring leg is dictated by the application and can be as simple as a tangential straight leg or much more complex.
 
It should be noted that it is best to keep the legs as simple as possible to reduce manufacturing tolerances and manufacturing difficulties.
 
  Torsion Springs-Design Hints
 
1. Proportions. A spring index that is a ratio of a mean diameter divided by wire diameter between 4 and 14 is best. Larger ratios require more than average tolerance. Ratios of 3.5 or less often cannot be coiled on automatic spring coiling machines because of arbour breakage. Springs with smaller or larger indexes do not give results exactly as the design formulas.
2. Total coils. Torsion springs with less than 3 coils buckle and are difficult to test accurately. When 30 or more coils are used, light loads will not deflect all the coils simultaneously due to the friction with supporting rod.
3. Diameter reduction. The inside diameter reduces during deflection. This should be considered and accordingly clearance should be provided over the supporting rod. Also, allowances should be considered for normal spring diameter tolerances.
4. Hand. The hand or direction of coiling should be specified for the spring designed, so deflection causes the spring to wind up and have more coils. This increase in coils and in overall length should be considered during design. Deflecting the spring in an unwinding direction causes high stress and may cause early failure.
5. Bends Arms should be as straight as possible. Bends are difficult to produce and often are made by secondary operations, and are expensive. Sharp bends are stress raisers that cause early failure. Bend radius should be as large as possible. Hooks tend to open during deflection.
   
Wire Form Springs
 
We manufacture wire form springs fully on automatic CNC machines. It must be remembered that a wire form of similar shape & dimensions may exert different forces due to different manufacturing methods adopted.
There is a special wire forming machine for making complicated products including multisided machines.
   
 
 
Retaining Ring
 
We at Accurate Springs have mastered the art of manufacturing Retaining Rings. Retaining Rings is often an alternative means of sealing components in assemblies from contamination.
 
Since they are produced from metal {not rubber, or other non metallic material} retaining rings can often withstand higher temperature and more corrosive environments and other more extreme conditions than common O-Rings or conventional rubber seals. This is the primary reason why design engineers prefer retaining rings in many applications.
 
Retaining rings offer higher clamping force when installed in the bore or on the shaft and are suited for higher operating speeds having 3600 [no axle gap} contact. One typical application is where high amount of dirt and dust are present and the ring sets provide the necessary seal against contamination from outside elements.
Retaining rings are also used to protect contacting radial seals, rubber seals, o-rings and other oil seals.
 
Retaining ring can be manufactured from spring steel flat wires and stainless steel flat wire. Many years of experience in making retaining rings has helped accurate springs to become a reliable supplier of quality retaining rings.
   
 
 
Garter Springs
We manufacture Garter Springs from Wire dia 0.5 mm to 3 mm.
 
Garter springs are long, close coiled extension springs with the ends fastened together and then used in the form of a ring to hold mechanical seals on a shaft, or to hold round segments together, or as driving belts such are often found in cameras, projection machines, and similar devices. we use several methods of fastening the ends which are like
 
1. Half hooks on each end can be hooked together.
2. A small screw can be inserted tightly in one end and the other end of the spring is reverse twisted so it winds itself onto the projecting end of the screw.
3. Several coils on one end can be wound at a reduced diameter. The spring is then reverse twisted and the reduced end is threaded into the other end.
  A familiar application of a garter spring is for an oil seal used on a shaft .The pressure per linear inch exerted by the spring on the shaft is determined by the amount of contraction exerted by the spring. This is often difficult to calculate precisely due to many variables involved including initial tension, rate, friction, effect of end fasteners, etc.
   
 
 
Spiral Springs
 
 
The spiral spring generally called clock spring is designed to produce a torque force [circular movement} and appears in two basic models; one with open coils [type A} and one with tight coils [type B].
 
Type A in working works without friction and is basically used at minor torsion angles. Up to 360º e.g., locking mechanisms
 
Type B is mounted in housing and can be designed to deflect several coils. It has a low force increase and is used for example a drive spring. Normally, this spring is delivered with a locking ring or wrapped by a metal strip.
 
     
 
Induction Coils
 
We manufacture Copper coils from wire dia 1 mm to 2.5 mm.
 
Induction coils are manufactured from copper enamelled wires or bare copper wires in cylindrical or parallel winding shape in single or multiple layers with stripped, tinned or moulded ends. These are specifically used in MCCB’s, MCB’s, ELCB’s or other similar electrical applications.
 
     
 
Spring Assemblies
 
Many applications require a combination of a spring, a pressed component, moulded parts etc. which are to be fitted in the form of assembly. We produce many assemblies for automotive and switch gear industries.
 
By buying ready assemblies the customer can save their time by ordering different components and also have control over inventory, mismatch of components etc. Hence as cost cutting measure customers should out source assemblies and give assemblies for production.
 
     
 
Valve Springs
We manufacture Valve springs from wire dia 1.5 mm to 5 mm.
 
As the name suggests it is a heart of any automobile. It is used in the Engine of any vehicle. The difference between regular compression Spring and the valve spring is that this spring works in high RPM and hot conditions the temperature may be around 150º C. Also valve spring has variable pitch in some cases.
 
For valve spring the Raw material required is oil hardened & tempered wire IS 4454 part III, 2d, 1d, 2s, Vw etc. Only the highest quality of super clean high strength alloy steel is used in the manufacturing of valve spring.
 
Whether you need a valve spring for car, motorcycle, tractor, truck engine etc. We have the technology and the know how to meet your needs of your vehicle engine.