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hydraulic tightening induction tightening precision mechanics


principe et avantages du serrage par induction



intend of induction tightening

The warm tightening and loosening of nuts & bolts are actually performed by means of radiant heating rods An operators' priority is the reduction of the time needed to carry out this operation. We developed an induction heating system that improves the achievement times and the security of both the operators and the material to be tightened.

the induction heating

Induction heats the steel in depth, contrarily to a radiant heating source. This characteristic of the induction allows to reduce consequently

The heating time
The temperature needed to obtain the required stretch
The cooling time
The heater element breaks
The risks related to the security
     of both the staff and the heated parts

material  ntend of induction tightening

The material we offer is
Light and compact (170 kg) (15kW, 380/400V)
Consistent with the Europeans norms (15kW, 380/400V)
Of high performance, compared with radiant heating
Easy to use
Self-limited in temperature
Easy to maintain
    (the electronic module is monobloc and interchangeable)



benefits ntend of induction tightening

Trials (between induction and radiant heating) performed on a M64 bolt (body length 350 mm, stretch 0,18%) have shown:


A gain of 2/3 in heating time for both tightening and loosening. On site, the gain of time lies between 2/3 and 1/2

A gain of 50% in cooling time. The difference of temperature for an induction and radiant heated bolt is of about 90ˇ

A gain in time of change from one bolt to another (immediate coming out of the heater element once the required stretch obtained).

A few seconds are needed to change from a bolt to another, no jamming of the inductor inside the bolt

A gain as regards the heater element. The inductors can be easily repaired.

Un gain sur l'élément chauffant.
     Les inducteurs sont réparables facilement,
A simple use (only one operator per machine)

An appreciable improvement of the security. Both heater element and bolt are cold (manual tightening without glove)

A maximal security for the tightened material. Curie point impossible to exceed

An autonomy of the whole heating set. There is just one plug to connect (autonomous and integrated cooling system)



the means ntend of induction tightening

We recommend:
Two induction machines for both the tightening and loosening of a body
Three heater elements per type (diameter & length) for two machines
On repair kit for the inductors
A 90ˇ elbow per machine
An adapter of diameter 12 mm for the heater elements


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