APPARATUS FOR GRINDING WELDING ELECTRODES, IN PARTICULAR WOLFRAM ELECTRODES

Abstract: An apparatus (2) for grinding welding electrodes, in particular wolfram electrodes, and comprising a drive motor (4) for a rotating grinding disc (8) and means adapted for fixing a welding electrode in a certain angle in relation to the grinding disc (8), where said fixing means comprising a displaceable apparatus part (24) parallel with the plane of the grinding disc in a fixed guiding (32), which apparatus part (24) is provided with two mutually displaced insertion openings (26, 30) or insertion positions for an electrode holder (20), namely a first insertion opening (26) or position in front of an arched angle scale (28) being provided or placed on the outside of a housing (6), and a second insertion opening (30) or position situated and adapted to fix the electrode parallel with the plane of the grinding disc (8) with the point engaging the upper part of the periphery of the grinding disc, and where the grinding disc (8) is positioned in a grinding house (6) preferably built together with said drive motor (4), said housing (6) being closed with a preferably transparent wall part (14), and being adapted to be filled with a grinding fluid, preferably water.

Description: 96/30162 PC--7DK95/00519 1 Apparatus for grinding welding electrodes, in particular wolfram electrodes The present invention relates to an apparatus for grinding welding electrodes, in particular wolfram electrodes, and of the type described in the introductory part of claim 1. Known grinding apparatuses for the said purpose work with a rotating grinding disc, where the welding electrodes are pointed by pressing against a side surface of the grinding disc in a wanted angle. This grinding principle makes it complicated to vary the grinding angle or the point of the electrodes. Furthermore it is realized, that this grinding principle or grinding apparatus involve some unsolved environmental pro- blems in connection with the aggressive grinding dust resulting from the grinding of welding electrodes containing wolfram. The invention has for its purpose to provide an improved apparatus for grinding of welding electrodes of the type described in the introductory part, and which by means of simple provisions makes it easier to adjust the grinding angle; as the apparatus in a preferred embodiment may meet the said environmental problems in connection with for instance grinding of wolfram electrodes. The apparatus according to the invention is distinctive in that said fixing means comprising a displaceable apparatus part parallel with the plane of the grinding disc in a fixed guiding, which apparatus part is provided with two mutually displaced insertion openings or insertion positions for an electrode holder, namely a first insertion opening or position in front of an arched angle scale being provided or placed on the outside of a housing, and a second insertion opening or position situated and adapted to fix the electrode parallel with the plane of the grinding disc with the point engaging the upper part of the periphery of the grinding disc. By means of simple provisions a grinding apparatus is hereby obtained, which makes it easier to adjust the wanted grinding angle. Appropriately the apparatus according to the invention is furthermore such provided, that the grinding disc is arranged in a grinding house preferably built together with said drive motor, said housing being closed with a preferably transparent wall part, and being adapted to be filled with a grinding fluid, preferably water. In a simple manner the said environmental problems with aggressive grinding dust are hereby met, by which manner possibility for an effective collecting of the grinding dust containing wolfram and having a considerable reusable value, furthermore is obtained. In order to minimize the spraying from the rotating grinding disc, of which the lowermost part is surrounded by the grinding water, the apparatus may advantageously be such provided, that the grinding house downwards has larger width, and that the grinding house in front of the grinding disc comprises a - from the bottom - upright partition wall, which lowermost is provided with one or more flow through openings. Due to the rotation of the grinding disc the main part of the grinding fluid is forced out through said flow through openings, so that the fluid level under the grinding disc is minimized. Also to keep the grinding fluid effectively inside, the apparatus according to the invention may be such provided, that the displaceable apparatus part preferably is waterproof connected with the grinding house, as there in a side wall part of the grinding house in front of the active insertion opening or the active insertion position for the electrode holder a flexible, oblong lip tighting is arranged, through which the outermost end of the electrode holder may be inserted. The invention is explained in more detail in the following with reference to the drawing, in which :- Fig. 1 shows a view - partly in section - of a preferred embodiment for a grin¬ ding apparatus according to the invention - seen from the front, and Fig. 2 shows a side sectional view of the grinding apparatus shown in Fig. 1. The shown grinding apparatus 2 is provided as a transportable unit with an electric motor 4, a closed grinding house 6 with a rotating, relatively thin grinding disc 8. The grinding house 6 is built together with an upper handle 10, which from a mainly triangular gable plate 12 projects over the electric motor 4, that is that the balance of the grinding apparatus 2 is optimum. As most clearly shown in Fig. 2 the grinding house 6 has a mainly triangular cross section with most width below. The grinding house 6 is closed outwardly by means of a clear acrylic plate 14, which makes it possible to watch the fluid level, as water is filled in the grinding house 6, so that the grinding disc is kept wet during the grinding process, and so that the grinding dust is collected in the grinding fluid. In the bottom of the grinding house 6 a partition wall 16 with lower flow through openings 18 is placed in front of the grinding disc 8. The partition wall 16 has the primary function - during the rotation of the grinding disc - to keep most of the grinding fluid away from the grinding disc 8 to limitate the spraying from the rotating grinding disc 8. When said grinding disc 8 stands still the fluid level of course equals on both side of the partition wall 16; but when the grinding disc 8 rotates, most of the grinding fluid is forced to the front of the partition wall 16, that is that the fling off of the grinding fluid is minimized. During the grinding work the welding electrode to be grinded is fixed in an electrode holder 20, which for the fixing of the welding electrode is provided with holding means using the same holding principle as that of a drilling cartridge or of a press pencil. The front end of the electrode holder 20 is inserted in the grinding house 6 through an oblong lip tighting in a side wall part 21, so that the electrode point itself may be pressed tangentially against the periphery of the grinding disc, that is that the oblong lip tighting 22 in the height is stretching over the whole adjustment area of the electrode holder. In other words the electrode point according to the invention is grinded by pressing against the periphery of the grinding disc 8, and the adjustment of a wanted point angle is obtained by the fact that the engaging area between the electrode, when it is placed in the first insertion opening 26, and the grinding disc 8, is moved along the upper part of the periphery of the angle scale 28 to the wanted angle position. This is obtained by displacing the displaceable apparatus part in a fixed guiding in a direction parallel with the plane of the grinding disc, and by situating and adapting the second insertion opening 30, such that the electrode is fixed parallel with the plane of the grinding disc 8 for engaging the electrode point against said upper part of the periphery of the grinding disc 8. The grinding apparatus 2 is at the right handside of Fig. 1 provided with a height displaceable sliding bracket 24, which cf. Fig. 2 has two mutual fixed insertion positions or openings for the electrode holder 20, namely an upper, first insertion opening 26 for insertion of the electrode holder 20 in order to adjust the point angle of the welding electrode in relation to the angle scale 28 on the front of the grinding house 6, and a lowermost, second insertion opening 30 positioned on level with the wanted angle position of the periphery of the grinding disc, as the sliding bracket 24 may be adjusted in relation to the fixed guiding 32 by means of a finger screw 34.

Claims: CLAIMS 1. An apparatus (2) for grinding welding electrodes in particular wolfram electrodes, and comprising a drive motor (4) for a rotating grinding disc (8) and means adapted for fixing a welding electrode in a certain angle in relation to the grinding disc (8), cha¬ racterized vt that said fixing means comprising a displaceable apparatus part (24) parallel with the plane of the grinding disc in a fixed guiding (32), which apparatus part (24) is provided with two mutually displaced insertion openings (26, 30) or insertion positions for an electrode holder (20), namely a first insertion opening (26) or position in front of an arched angle scale (28) being provided or placed on the outside of a housing (6), and a second insertion opening (30) or position situated and adapted to fix the electrode parallel with the plane of the grinding disc (8) with the point engaging the upper part of the periphery of the grinding disc. 2. An apparatus (2) according to claim 1, chara t riz d in that the grinding disc (8) is positioned in a grinding house (6) preferably built together with said drive motor (4), said housing (6) being closed with a preferably transparent wall part (14), and being adapted to be filled with a grinding fluid, preferably water. 3. An apparatus (2) according to claims 1 -2, characterized in that said grinding house (6) downwards has larger width, and that the grinding house (6) in front of the grinding disc (8) comprises a - from the bottom - upright partition wall (16), which lowermost is provided with one or more flow through openings (18). 4. An apparatus (29 according to claim 1, characterized in that the displace- able apparatus part (24) preferably is waterproof connected with the grinding house (6), as there in a side wall part (21) of the grinding house (6) in front of the active insertion opening (30) or the active insertion position for the electrode holder (20) a flexible, oblong lip tighting (22) is arranged, through which the outermost end of the electrode holder (20) may be inserted.

Inventors: CHRISTIANSEN JAN, CHRISTIANSEN, JAN
Applicants: CHRISTIANSEN JAN, EURO TOOL APS, CHRISTIANSEN, JAN, EURO-TOOL APS
Application year: 1995
Main classification: B24B19
IPC codes: B23K9, B23K11, B23Q11, B24B19