Metal fusion bonding – With means to juxtapose and bond plural workpieces
Patent
1993-02-24
1994-01-11
Ramsey, Kenneth J.
Metal fusion bonding
With means to juxtapose and bond plural workpieces
219 98, B23K 920
Patent
active
052773531
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a stud welding device with an adjustable linear motor as regulating member for the axial displacement of a setting element of which the movement is transmitted to a stud holder,
The principle of a stud welding device of this type is mentioned in DE-PS 32 15 453. The patent refers to the use of a dynamo-electrical linear motor as regulating member (see claim 9) which is to be adjustable with respect to the setting path and the setting speed. With respect to the adjustability of the setting path, only a path measuring device scanning the setting path is mentioned in this connection which can be interpreted that signals can be derived from the path measuring device, which signals indicate the respective position of the setting element so that the setting path covered in each case is dependent on the signals from the path measuring device.
In the above-mentioned patent, a rotating step switching motor is mentioned as a regulating member (see claim 5) which would allow setting of the setting element with stud holder without a path measuring device as the step switching motor can be adjusted digitally into any desired rotational position. In order to transmit the rotation of the step switching motor into linear movement, however, intermediate gearing is required, as disclosed in the patent in the form of a nut and a spindle which is moved therein.
Other regulating members for the controlled adjustment of the position and movement of the setting element with stud holder of stud welding devices have not been considered hitherto.
The object of the invention is to provide a stud welding device of the type mentioned at the outset which manages without intermediate gearing, allows direct adjustment of the position and movement of the setting element and is distinguished by a compact construction. Accordingly, the invention, provides a stud welding device comprising a stud holder and a movable member which moves the stud holder axially to carry a stud into position for welding, in which the movable element is moved by an adjustable linear motor
characterized in that
the adjustable linear motor is a helical thread reluctance motor having an armature and a stator
the movable element is provided by one of the armature and the stator
the other of the armature and the stator provides a stationary member of the device, and
the linear motor and the stud holder are rotationally symmetrical.
Helical thread reluctance motors (SGRM) are known which provide a settable linear motor; such a motor is described in Proc. IEEE, volume 118 (1971) pages 1575-1580. The motor described in this document is controlled by a three-phase voltage with mains frequency by means of which a corresponding rotating field is produced. Furthermore, it is known from DE-OS 36 20 472 also to control the SGRM with a frequency-variable m-phase voltage, including the frequency zero, several direct current voltages instantaneously occurring in the latter case and keeping the moved member of the SGRM in the respective set position attained.
The invention is based on the fact that the SGRM is located in a particularly advantageous manner in a stud welding device as a regulating member for the stud holder of a stud welding device if the setting element displacing the stud holder is formed directly by the movable member of the SGRM. This construction advantageously utilises the design of the SGRM because the movable and stationary members are inserted rotationally symmetrically into one another therewith so that the movable member can carry the stud holder directly while the stationary member forms the mounting of the stud welding device. The movable and stationary members of the SGRM are therefore arranged directly behind the stud holder so that there is no additional space requirement in the longitudinal direction of the stud welding device for mounting the regulating member for the stud holder, as is the case, for example, when using the rotating step switching motor mentioned in DE-PS 32 15 453. Overall, the direct connection of the mov
REFERENCES:
patent: 4797529 (1989-01-01), Schmitt et al.
patent: 5171959 (1992-12-01), Schmitt et al.
Budig Peter K.
Knetsch Harald
Schmitt Klaus G.
Emhart Inc.
Murphy Edward D.
Ramsey Kenneth J.
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