Dynamic and flexible in what we offer
Our rolled bars with trapezoidal threads are obtained by cold deformation (rolling) according to ISO 2901/2902 and DIN103 in tolerance 7e.
Cold forming rolling is used to obtain a profile (thread, groove, knurling, etc.) without removing any material. The raw material, a smooth bar, is driven by 2 wheels and deformed by compression. This technology enables a profile to be formed without cutting the fibres of the material, thus ensuring better mechanical resistance.
Rolling is carried out in a diving or enfilade process.
Diving: This process allows the threading of parts over a defined and localised length. In this configuration the bar is static between the threadind wheels.
In-feed: this process allows the threading of bars over their entire length. In this configuration the bar moves between the threading wheels.
We can produce all types of quantities, small, medium or large series. In a very wide range of diameters, from 1.5 to 430mm.
• Standard and specific threading profiles
• All types of materials
• Rolling lengths: < 12 m
• Diameters: from 1.5 to 430 mm
All products linked to rolling transmission
Our rolling bars with trapezoidal or ball threading are obtained by cold forming (rolling) or by machining. We can produce parts in small, medium or large series, assemble mechanical sets or subsets and apply any surfacing treatment.
To ensure the quality and performance of the parts we make, we undertake our own inspection and testing procedure. They are submitted to different categories of tests and resilience, to mechanical trials and, if necessary, to non-destructive controls (recording, ultrasound…)
Cold threading consists of machining (without chips) the lateral surface of a cylindrical part by cold forming the material in a press with a specific tool called “the knurling wheels” enabling the formation of threads, knurling or grooves.
The 2 knurling wheels get closer to the part by turning in the same direction to carry it along in rotation and to penetrate the material until it deforms and reproduces the desired shape.
The thread of our screws rolled by cold forming comes from deforming the material under the force exerted by the two knurling wheels bringing with it the opposite shape of the part to be machined. The material is then bent and takes the shape of the knurling wheels, so it leads to an expansion of the part’s diameter. The two sides of the material run right to the depth of the knurling wheel groove to finally meet.
The zone where the two sides meet makes a crease of which it is possible to adjust more or less the closure. In the industry, it is called « buttock effect » and it is an efficient method to identify rolling made by cold forming.
This technique of cold forming is a reliable and efficient process. Rolling represents an unbeatable cost-effective advantage as it allows production time saving while using less raw material.
This process therefore presents numerous advantages compared to other systems based on material removal.
• Material fibers deformed but not cut
• Considerable gain of material as the roughing Ø is inferior to the finished Ø (no chips versus machining)
• Increased mechanical resistance: the material is hardened on the surface by increasing its mechanical resistance)
• Improved surface quality versus machining (no marks on the parts due to wearing away the tools)
• Noticeable increased high precision of thread versus machining
• Possibility to make specific shapes
• Possibility to roll long lengths
• Reduced production time versus machining
• Reduced production cost as the rolling is made in a single production
• Cost reduction versus rolling
through adapted and customised options
Whatever the size of your company, giving you first class service is our main objective as well as fulfilling your specific needs while controlling your costs.
One contact: your expert sales manager!
+33 (0)4 50 58 26 81