Electric heating – Metal heating – By arc
Patent
1996-04-25
1997-11-11
Shaw, Clifford C.
Electric heating
Metal heating
By arc
15 931, 21913743, B23K 932
Patent
active
056860005
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a device for automatically cleaning and cutting off the wire in the nozzles of MIG/MAG welding equipment.
BACKGROUND ART
When welding with automatic and semi-automatic welding equipment spraying and splashing occurs in the nozzle, thereby preventing a uniform flow of the protective gas used during electric arc welding. Unless this problem is remedied the welding quality will gradually deteriorate, resulting in welding defects.
When performing MIG/MAG welding manually, the welding is stopped at regular intervals and the welding sleeve (gas hood) is manually cleaned using files, knives or the like, and a special wire brush. The welding bead is then cut off to give a suitable tip. Lumps and thickened portions often occur at the tip, which should preferably be avoided. The aim is thus to prevent welding defects at the starting instant. A welding spray is applied to inhibit further coating. However, this welding spray does not completely prevent coating but only provides protection for a limited period.
In the case of automatic welding by robots the problem is greater since the welding process must be interrupted and sometimes the welding programme must be restarted after cleaning. A few specially designed cleaning machines are commercially available but it is difficult to fit them into the entire cleaning process, including spraying and bead cutting. No procedure that performs these steps simultaneously is commercially available. It is known per se to mill off such deposits, but not in combination with other necessary steps.
SUMMARY OF THE INVENTION
The present invention aims at solving the above-mentioned and associated problems and is characterized in that the device, which is portable, comprises a centering member for insertion of a nozzle, and milling means to mill coated parts of the nozzle, as well as possibly a cutting member for the foremost part of the welding bead of material applied, the milling means and cutting member if any being rotated by a drive means designed to start automatically upon insertion of the nozzle.
This equipment enables the time required for the entire cleaning and cutting process to be greatly reduced (to 4-5 seconds), while enabling this cleaning process to be introduced into the welding cycle at pre-programmed intervals.
BRIEF DESCRIPTION OF THE DRAWINGS
An example of the invention is illustrated in the accompanying drawings in which:
PREFERRED EMBODIMENT
FIG. 1 shows a welding nozzle (1) which is inserted into a centering member (2), whereupon a drive means (3) such as a pneumatic or electric motor starts and drives two or more milling means (4, 5).
FIG. 1A shows a welding nozzle (1) coated with inner and outer deposits (6). A welding bead (7), thickened or coated at the front end can also be seen in this figure.
The milling means (4, 5) are rotated around the nozzle (1) and are shaped both (FIG. 1) for machining the inner deposits in the lower part of the nozzle and also (FIG. 2) the outer deposits and deposits on the front of the nozzle (components 4 and 5, respectively, in FIGS. 1-3).
The invention also includes a cutting member (10) to simultaneously cut off the foremost part of the welding bead, see FIG. 4. This cutting member is suitably rotated at the same time as the milling means, but may also rotate separately. It comprises two cutters, one which is fixed in radial direction (8) and one which is movable in radial direction (9). The movable cutter is influenced during the rotation by a cam disc (13) or the like towards and away from the fixed cutter (8), against the action of a spring (11). The front part of the bead (7) is thus cut off. FIG. 5 shows a waste trough lowermost in the device (12), for material machined off.
The device operates as follows:
When the nozzle (1) has become coated ("dirty") it is inserted in the cleaner and the automatic milling means (4, 5) starts up and scrapes the nozzle dean and an exact length of the protruding welding bead is cut off. In the meanwhile welding spray 14 is ap
REFERENCES:
patent: 4583257 (1986-04-01), Bridges et al.
patent: 4702195 (1987-10-01), Thielmann
patent: 4733050 (1988-03-01), Grafius
patent: 4778976 (1988-10-01), Litt et al.
patent: 4834280 (1989-05-01), Thielmann
patent: 4935598 (1990-06-01), Ward
patent: 5070568 (1991-12-01), Wilcox et al.
patent: 5138969 (1992-08-01), Thielmann
patent: 5221826 (1993-06-01), Lee et al.
Shaw Clifford C.
Swedtech AB
LandOfFree
Device for cleansing welding torches does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Device for cleansing welding torches, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device for cleansing welding torches will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1226154