Unlikely the compression springs, traction springs are manufactured with joint coils and under the effect of a force it stretchs out. They are used as recall spring into many applications (doors, windshields…). It exists many hook system following request and space.
Our production ability
We own a full park of digital machines. By means permanent investments (camera control on winding machines, specific tools etc….), we can assure competitivity, reliability and quality.
We are able to realize all kind of traction springs following drawing, specification needs, technical datas and existing part. From diameter 0.20 mm to 8.00 mm and from body diameter 2 mm to 180 mm.
Heat treatment (Stabilisation)
The heat treatment allows to relax residual stress when the spring is being shaped. During this operation, the geometry of the spring can differ (diameter and length). The temperature and the exposition time can vary depending on the raw material used. We have go-through furnace at the machine outfeed and many other oven. All of them are equipped with a temperature recorder in order to follow and record the temperature needed on each application in actual time. They can be communicated on request.
Forming or shaping for specific hook
The choice of the hook depend on the type of how the spring is going to be used. We have a forming workshop able to realize standard hook such as (German, English etc…) and complicated hook. (Screw kook at the end of the spring, mobile hook etc..)
The blocking operation for traction springs is usually done by stretching the spring to a defined height. It raised artificially the acceptable level of stress of the spring.
Cleaning, tribofinishing, oiling
In many different activities cleanliness has become a major criteria. In order to answer to this demand we have an ultrasound machine that transfer the parts to a white room to obtain particles rate close to 300µ.
We are also equipped to reduce burrs following the grinding operation.
In addition, we have machines that can spray oil on steel parts who do not need surface treatment to guarantee a corrosion protection. We can get a finishing result as « dry when touched » or « lightly oily ».
Having a hard time to spot your springs? We can realize or request spotting from our sub-contractor following specific request.
Set on tray, in small plastics boxes and tubes etc…