Electric heating – Metal heating – By arc
Patent
1999-10-12
2000-10-31
Heinrich, Samuel M.
Electric heating
Metal heating
By arc
21912182, B23K 2608, C21D 100, F02F 100
Patent
active
061406058
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method and a device for treating the surfaces of bore holes in components, in particular for treating the running paths of cylinder bores in engine blocks by means of a laser beam which is directed by deviation optics to the surface to be treated.
For surface treatment of heavily loaded surfaces of bore holes, in particular for treatment of the running surfaces of cylinder bores of internal combustion engines, devices are used which heat up the running path to be treated by laser beams with a high energy density. The incidence of the laser beam into the bore hole is coaxial to the axis of rotation of the deviation optics, said axis of rotation coinciding with the longitudinal axis of the bore hole. By means of a rotating mirror, the laser beam is deflected in the deviation optics and projected towards the surface to be treated.
In the case of the known treatment stations, due to their small size and light weight, the deviation optics can be rotated without any problems at high rotational speeds. Depending on the number of rotations completed, during treatment the deviation optics are inserted progressively deeper into the bore hole via suitable linear drives, until treatment is completed. Following this, the deviation optics are withdrawn from the bore hole and moved to the subsequently to be treated bore hole by a further linear drive.
The advantage of the known treatment station is due to the light weight of its deviation optics. This makes it possible when treating bore hole surfaces, to move only small masses. Accordingly, only low centrifugal forces have to be overcome during treatment of the surfaces. Furthermore, the high rotational speed of the deviation optics results in effective and even treatment of the bore hole surfaces. The light weight also enables easy advance with little expenditure of energy, of the deviation optic to the bore hole to be treated next. Due to these two known advantages of the known treatment stations, the said stations can be compact and low cost and can thus be produced more economically.
However, practical use has shown that the known treatment stations can only be operated at low efficiency. Due to the confined space and the necessity of arranging the deviation mirror of the deviation optics on its axis of rotation, only a fraction of the laser beam actually reaches the surface to be treated.
Apart from the above-mentioned state of the art known from practical experience, Patent Abstracts of Japan, C-50, 1981, vol. 5, no. 54, JP 56-5923 A discloses a device wherein for heat treatment of the surfaces of bore holes in cylindrical components by means of a laser beam, which is directed to the surface to be treated by way of deviation optics, during treatment the cylindrical component is rotated around an axis of rotation parallel to the longitudinal axis of the bore hole to be treated, with the deviation optics being stationary.
It is the object of the invention to provide a method and a device which with little expenditure allows the treatment of surfaces of component bore holes with increased precision and with improved efficiency. Concerning a method of the type described in the introduction, this object is met in that during the treatment process, the component is rotated around an axis of rotation aligned parallel to the longitudinal axis of the bore hole to be treated, with the deviation optics being stationary; and in that unbalanced masses occurring during rotation of the component are balanced by balancing masses. Preferably the axis of rotation of the component should coincide with the axis of rotation of the bore hole to be treated.
This object is also met by a device for treating the surfaces of bore holes in components, in particular for treating the running paths of cylinder bores in engine blocks, by means of a laser beam, comprising deviation optics insertable into the bore holes to be treated, for deviating the laser beam onto the surface to be treated; a turntable drive for rotating the component around an axis of rotation arran
REFERENCES:
patent: 4017708 (1977-04-01), Engel et al.
patent: 4365136 (1982-12-01), Gottlieb
patent: 4543463 (1985-09-01), Scuricini
patent: 5719373 (1998-02-01), Snyder et al.
Elotherm GmbH
Heinrich Samuel M.
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