Gradel-Baudin surface heat treatment
Gradel-Baudin ball-screws are made by cold deformation. This process consists of deforming a smooth metal bar by pressing it by rotation with the help of tools called knurling wheels to obtain the thread. We use steels combined with carbon, known for their high quality: C55R (1.1209) or CF53 (1.1213). After rolling, screws are subjected to superficial induction hardening…
Induction hardening is a process used for the surface hardening of steel and other alloys. This type of treatment enables hardening of the screw surface, while preserving its core mechanical characteristics. This guarantees a good performance in standing the test of time and improves the resistance to fatigue. The screws are placed inside a copper coil, the alternative current in the coil inducts a magnetic field, that heats the external surface of the part until it reaches a temperature higher than the transformation of steel. The components heated by the alternative magnetic field are then subjected to an immediate hardening process to cool them down.
The induction hardening enables a high surface hardness to be obtained with a great depth of hardening, capable of enduring extremely heavy weight. The resistance to fatigue is increased by the development of a supple core surrounded by a solid external layer. These properties are required for parts subject to twist and shocks.
This process of induction hardening enables to manage the depth of hardening as well as its toughness. Induction hardening is used to reinforce a specific area of the part. We are capable of localized made-to-measure hardening, in accordance with the client’s needs. Afterwards, the screws are cleaned, polished and controlled one by one.
Ø from 9 to 80 mm
from 2 to 6 m
Superficial induction hardening
Objective: to obtain a high surface hardness while preserving the internal metal structure. This process of hardening the steel surface can allow a local thermic treatment on the part. By means of a high technological equipment and a process mastered by our technicians, we improve resistance to fatigue and screws wear and tear.
Dimensional and structural inspections: 2 tests that guarantee optimal quality! Our technicians check contact points of the screws on the sides, inspect the screw pitch, verify state of the surface with a shape tester and control the hardness with a hardness tester.
Polishing brings back shine to the bar after the thermic treatment. The brushes in rotation exert a mechanical action on the bar to clean off impurities and other layers. The last step of the hardening process is to control the ball screw pitch, in order to classify the bar precision.
through adapted and customised options
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+33 (0)4 50 58 26 81