STAMPING- AND CUTTING DEVICE INCLUDING A SOLDERING JIG FOR CORE DRILL PIPES AND PROCEDURE BY USE OF SUCH DEVICE

Abstract: The invention relates to a stamping and cutting device (20) for core drill pipes (11) comprising a height adjustable support structure (21) having a horizontally displaceable sliding system (23), which is provided with a dividing plate system (24) for fixing and segmental dividing of the core drill pipe (11), and a vertically extending profile (22) including a vertically adjustable tonge (6) and a soldering jig (26) fixed to the support structure (21). The tonge (6) is claw-shaped for location above and on both sides of the pipe wall. The tonge (6) is provided with an outer claw part which forms the fixed bit (16) of the tonge (6), for location on the internal side of the core drill pipe (11), and an inner claw part including a stamping piston (8) for location on the external side of the pipe (11) and adjacent to the bit (16).

Description: Stamping- and cutting device including a soldering jig for core drill pipes and procedure by use of such device. The present invention relates to clean cutting and segment groove cutting of core drill pipes and eventually application of the segments (diamond bits) to the pipe. A core drill pipe consists of a steel pipe which is closed by welding in the one end, wherein also a device is mounted for attaching the bore to the drilling machine itself, and segments which in the opposite end are mounted in grooves around the circumference. The grooves provide for a very good connection of the segment in addition to the hard soldering. The segments are thicker than the wall of the pipe for achieving sufficient clearance during the drilling work, resulting in that the pipe in a limited degree is exposed to wear. The pipe is a relatively expensive consumer product and therefore it is common to use the pipe several times. This requires a replacement of the diamond segments. This process itself is carried out in that the pipe is cut straight under the segments and that the end of the pipe is provided with new segment grooves. In carrying out this work it is known several methods. The most common is based on machining by means of sawing and milling. Since most of the users of core drill pipes do not themselves have equipment for this kind of work, it is necessary that the work is carried out by proper work shops. It is obvious that machining the pipe end is a method which is both time consuming and costly due to the thin pipe wall. Lately it has been developed new methods for this process, wherein the drill pipe is fixed in a machine where both cutting and punching of the segment grooves are carried out. The cutting is carried out by use of one in the machine fixed electrical cutting disc, and in that the bit is welded to this disc. Due to the hardness of the pipe and the required care which must be taken during the machining of the free end of the pipe, the wear on the disc is very heavy, which creates enormous amounts of dust. This results in a health problem as well as a cleaning problem. The punching of the segment grooves is carried out by means of a manually operated tool which is fixed to the machine, and due to the large variation of pipe dimensions it is often necessary to replace the fixed bits, which are adjusted to the inner diameter of the pipe, such that the necessary support is achieved. In order to avoid burrs in the punching area it is further necessary with relatively small toleranses of the replaceable bits, and non- skilled use or inaccuracy during the replacement causes in many cases excessive wear or that the parts are destroyed, simultaneously as it requires that the tool and material at any time is available. By the equipment according to the invention, a process is achieved wherein the cutting does not create dust and where it is not necessary to replace parts of the tool when changing the pipe dimension. This is achieved according to the invention in that the cutting is carried out with the same tool as is used for punching the segment grooves, and after the cutting an eventual diamond bit can be directly applied to the segment grooves, since the core drill pipe is fixed in the same device. In a first embodiment the core drill pipe is fixed in a base part (support structure) and thereafter the claw-shaped moveable stamping/ cutting device is lowered down on the pipe end where the worn diamond segments are located, and by repeated punching the complete pipe end is cleaned such that a straight circu ferencial cut is made under the level where the worn segments were located. The tool is not fixed in any other way than the operator by means of a handle to a certain degree controlls the punching. This makes it possible for the tool to turn during the punching process, which is necessary for achieving maximum utilization of the specially shaped knife of the tool. The knife which is the front part of a stamping piston is shaped such that it firstly will hit and penetrate the pipe in a central area of the width of the knife edge. Thereafter, the one half part of the knife edge in its width direction will gradually punch out the pipe in this area, and when this part is punched out, the second half part of the knife edge will gradually punch out the rest of the segment of the pipe which corresponds to the recess opening of the fixed bit. The advantage is that the diameter of the pipe is of no meaning for the punching, since the pipe is kept against the fixed bit all the time, and it is not necessary to change the bit for different diameters either. In a second embodiment of the invention the claw-shaped stamping/cutting device is fixedly mounted, but adjustable in the height direction, to a vertical profile which is fixed to a support structure in a jig. The core drilling pipe is fixed to a dividing disc (plate) which is mounted on to a sliding system which again is located on the support structure. In this embodiment of the invention, the pipe is turnable, while the stamping/cutting device is fixedly mounted. The stamping and cutting device including a soldering jig according to the invention, is further described with reference to claim 1. The stamping and cutting device according to the invention is shown in the drawings, wherein: fig. 1 shows the complete equipment in a first embodiment form, including fixedly mounted core drill pipe and moveable stamping device, fig. 2 shows a hydraulic actuated stamping and cutting device mounted on a jig according to the second embodiment of the invention, wherein the stamping/cutting device is fixedly mounted on a profile, but adjustable in the height, and the pipe is turnable mounted in the jig, fig. 3 shows a manually actuated stamping and cutting device mounted on a jig according to the second embodiment form of the invention, wherein the stamping/cutting device is fixedly mounted on the profil, but adjustable in the height, and the pipe is turnable mounted in the jig, figs. 4a, b and c show the piston having the specially shaped knife edge according to the invention seen from above, from the side and from the front, respectively, figs. 5a and 5b show the claw-shaped stamping device in an elevational view and in a horisontal view thorugh the knife or the stamping device, respectively, figs. 6a - c show the fixed bit of the stamping device and the position of the piston at the beginning, partly completed and completed stamping operation, respectively, figs. 7a - e show the stepwise method for combined cutting and stamping of segment grooves of an used core drill pipe, in addition to the mounting of segments (diamond bits) , and fig. 8 shows the soldering jig for use when mounting the bits. Firstly, the stamping and cutting device will be described in relation to a first embodiment of the invention. Initially, with reference to fig. 1 a jig device 15 having a support structure 1 which functions as a fixing unit for the pipe 11 and located on floor level or another suitable base is shown. The pipe 11 is vertically fixed on a not further described turnable support in the support structure 1 which allows for a sentrical turning of the pipe 11 in the horizontal plane, by means of the fixing device which is used for fixing the drill pipe to the drilling machine. A drive unit is mounted to the support structure 1, which consists of a pneumatic jack 3 which is connected to a hydraulic cylinder 4, and a foot operated maneuovering valve 5 for maneouvering the jack 3. The hydraulic cylinder 4 supplies the cylinder 7 of the tool 6 with oil under a pressure which is determined by the mutual piston diameter difference between the jack 3 and the hydralic cylinder 4 when it is influenced by the jack 3. When the operator lowers the claw-shaped tool 6 down on each side of the pipe end and activates the maneuovering valve 5, the cylinder 7 of the tool 6 forces the knife 8 against the pipe and provides that the desired punching (stamping) is carried out, see figs. 6a - e and 7a - d. The edge 12 of the piston 8 is such grinded that it initially will hit and penetrate the pipe 11 in a central area 9 of the edge 12. Thereafter, the one width half part 10 of the edge 12 will stepwise punch out the pipe 11 in this area, simultaneously the second penetration area 13 of the knife is driven to the pipe without further punching it. After the stamping of the pipe 11 is carried out in the first stamping area 10, the second width half part 14 of the edge 12 will stepwise punch out the rest of the segment groove in the pipe 11. After one segment groove is punched out, the pipe 11 is turned and the next segment groove is punched out until the desired number of grooves are achieved. Moreover, it is easy to understand that the process will be the same during cutting of the pipe 11, however, the difference will be that the knife 11 will cut slits around the complete pipe diameter on the underside of the grinded segments, such that this parts can be removed. A second embodiment of the stamping and cutting device according to the invention will, now be described with reference initially to figs. 2 and 3, which show a manual and a hydraulic embodiment of the stamping and cutting device 20 according to the invention, respectively. In figs. 2, 3 it is shown an embodiment of a stamping and cutting device jig 20 comprising a support structure 21 having adjustable feet for location on a solid base, floor etc. , a vertical profile 22 is fixed to the support structure 21, a claw-shaped stamping/ cutting device 6 with a hand operated eccentrical supported level 27 (manual embodiment fig. 3) is arranged in the groove 22 of the profile, a dividing plate 24 for fixing of the pipe 11, and stepwise rotation of this is arranged on a sliding system 23, which again is located on the support structure 21, and a soldering jig 26 for the core drill pipe is mounted to the stamping device and the vertical profile 22. According to the described system a vertical adjustment of the tonge 6 is allowed along the profile 22 and without the tonge 6 being twisted out of position. The vertical adjustment or height adjustment is necessary partly to be able to cut pipe 11 having different lengths and for being able to cut pipe 11 including worn diamond segments. The cutting is carried out in that the desired member of segment recesses are cut in suitable distance from the existing, and that the tonge 6 thereafter is elevated to a level which gives the desired segment recess depth, whereafter the area in between the segment recesses are cut away. This cutting method is based on that the areas between the segment recesses never are wider than the recesses themselves. Following the adjustment a searcher fixed to the tonge 6 being located in the recess and which the underside of the knife is resting against. The choice of searchers is determined by the required depth of the different segments, and the user's need. In order to achieve complete stamping of recesses in all pipe diameters it is necessary that the knife (tonge) 6 and the pipe 11 moves in relation to each other. Having a fixed tonge 6 it is further necessary that pipe centrated supporting points in the support structure 21 can be displaced on variable pipe diameters. Both conditions are solved by locating the support of the pipe 11 in the support structure 21 on a sliding system 23 (see figs. 2 and 3) having an axis along the length axis of the stamping tonge 6, and an axis 90 degrees to this. The axis system is located in the horizontal plane. The slide 23 along the length axis of the tonge 6 takes up the movement of the pipe 11 during stamping, simultaneously it is displaceable in the directional axis of the stamping tonge 6 and is displaced according to the diameter of the pipe 11, since the stamping tonge 6 itself always stands still and moves up and down in the length direction of the pipe 11 only. Standard movement will allow stamping of pipes 11 up to a diameter of 600 mm. The support structure 21 is provided with a device for mounting of an extension on the slide 23 in order to increase this one. This will substantially be of interest for stationary arrangements. The second axis is short and its function is only to allow movement of the pipe 11 against the knife. The main phases of stamping and cutting of a core drill pipe 11 shall be specially explained in the following with reference to figs. 6a - c. Fig. 6a shows a first phase wherein the point 9 of the knife edge 8 stamping through wall of pipe 11. The bit 16 has three inlets 31 with different radii. Fig. 6b shows the second phase wherein the pipe 11 twists in relation to the bit 16, and the first punching surface 10 of the piston 8 stamping out the pipe wall on this side of the longitudinally extending section 2 through the thickness of the piston 8. The core drill pipe 11 moves around and sidewise against the radius of the bit 16 as the piston 8 cutting through the pipe wall. The bit 6 can be rotated for the use of three different radii in order to approach the radius of the core drill pipe 11 as close as possible. In this embodiment of stamping bit 16, the first inlet 31 is provided for core drill radii from 15 - 60 mm, the second inlet 31 for core drill radii from 60 - 120 mm, and the third inlet 31 for core drill radii from 120 to infinite. Fig. 6c shows the third phase, wherein the second punching surface 14 of the knife edge 8 penetrates the pipe wall as the pipe 11 twists in relation to the bit 16 in the different direction and punching through the last half part. Now with reference to figs. 7a - e and fig. 8, the main phases of cutting, shaping of segment recesses 17 and application of segments (bits) 18 in these segment recesses are described. In fig. 7a it is shown how the segment recesses 17 are punched out around the circumference of the pipe 11 having the distance and slit width necessary for the segments 18. Fig. 7b shows the next step, wherein the stamping tonge 6 is elevated 1 - 3 mm and pointed in between already stamped slits 17. Fig. 7c shows the core drill pipe 11 completely stamped between and above the first slit cut. Fig. 7d shows that the worn out core drill crown is loose and can be lifted off, simultaneously the slits 17 are ready for soldering of segments (bits) 18. Fig. 7e shows the core drill pipe 11 with segments 18 soldered on and ready for use. Soldering of segments 18 is shown in more detail in fig. 8. As is shown here, the core drill pipe 11 is rotated around and the stacked segments 18 inside the cartridge 30 drop down in each slit 17, and being kept in place by the outside magnet part 30 and then soldered to the core drill pipe 11. The segment application unit is fixed to the stamping tonge 6, such that the pre-set slit distance for stamping is used. To achieve an even running and wear of the bits it is important that the segments are evenly distributed. Depending on the diameter of the bit and the area of application, the number of segment 18 varies. The solution used for this is known and based on dividing plate (disc) principle (see figs. 2 and 3) , wherein the respective number of segments appear as holes oh a dividing circle. The release from the holes is achieved by means of a spring biased locking bolt 25 which by twisting of the pipe 11 is pulled out of the hole manually. In order to cover all the segmental dividing with its respective dividing diameters, it is necessary that the locking bolt 25 are displaceable in a recess, and in practical use it is experienced that the manual use of the bolt may cause that this being moved, such that the dividing has changed during the cutting. This problem is solved by a two-armed holder resting against the dividing plate 24. In order to give a clear dividing the dividing plate 24 having to sides, i.e. the actual number of segments is distributed on both sides of the plate 24, such that it is larger distance between the dividing circles on the existing plates only. The sides cover each dividing area, and the actual side is divided up under the holders. On the arms of the holders the respective scales are found for dividing areas (the teeth number) on each arm. On the arm it is mounted a holder having a spring biased ball which during the stamping locks in the hole row it is adjusted to along the arm. For each stamping the pipe 11 will be able to be twisted with hand power in that the ball is pressed up into its holder until it is allowed to be pressed down in the next hole. The system is very simple, and practical experience has proved that the working effectiveness (speed) exceedes the equipment based on the prior art solutions.

Claims: C L A I M S 1. Stamping and cutting device (20) for core drill pipe (11) comprising a height adjustable support structure (21) having a horizontally displaceable sliding system (23) , which is provided with a dividing plate system (20) for fixing and segmental dividing of the core drill pipe (11) , and one to the support structure (21) fixed vertically extending profile (22) including a vertically adjustable tonge (6) and a soldering jig (26) , c h a r a c t e r i z e d i n that the tonge (6) is claw-shaped for location over and on both sides of the pipe wall having an outer claw part, which forms the fixed bit (16) of the tonge (6) , for location on the internal side of the core drill pipe (11) and an inner claw part having a stamping piston (8) for location on the external side of the pipe (11) and adjacent to the bit (16) , which piston (8) within a central area of its width is formed with a first knife-shaped vertical penetration point (9) , wherein the inclined, horizontal surfaces of the knife edge (12) forms a substantially acute angle to a longitudinal section (2) through the thickness of the piston (8) , since the piston (8) in the widthwise direction and on the one side of the point (9) is shaped into a vertical first stamping surface (10) which forms a less acute angle with the lengthwise section (2) , and which in the edge area or the piston (8) is perpendicular to the same section (2) , and the piston (8) is further in the lengthwise direction on the other side of the point (9) shaped with a second penetration area (13) , which closest to the point (9) has the same shape as this and which at a distance from the lengthwise section (2) has penetration surfaces (13) which coincides with the lengthwise section (2) of the piston (8) , and the knife edge (2) of the piston (8) is further in this second width direction shaped with a second stamping surface (14) which forms a less acute angle with the lengthwise section (2) and which against the edge area of the piston (8) is perpendicular to the same section. 2. A stamping and cutting device (20) according to claim 1, c h a r a c t e r i z e d i n that the bit (16) is rotatably arranged on the tonge (6) and shaped with a number of inlets (31) , preferably three, having different radii. 3. A stamping and cutting device (20) according to claim 1 and 2, c h a r a c t e r i z e d i n that the soldering jig (26) which is arranged to the tonge (6) consists of an upper cartridge part (30) , having vertically stacked segments (bits) (18) , a lower magnet part (30) and a soldering unit (29) , whereby the stamped siits/segment recesses (17) of the pipe (11) each receive its respective segment (18) , since this is pushed out of the cartridge (30) , kept in place by the external magnet part (30) and then soldered to the core drill pipe (11) . 4. A method for using the stamping and cutting device (20) for the core drill pipe (11) comprising a height adjustable support structure (21) including a horizontally displaceable sliding system (23) , which is provided with a dividing plate system (24) for fixing and segmental dividing of the core drill pipe (11) , and one to the support structure (21) fixed vertically extending profile (22) including a vertically adjustable tonge (6) and a soldering jig (26), c h a r a c t e r i z e d i n that the core drill pipe (11) is fixed vertically on the dividing plate (24) , the tonge (6) is moved along the profile (22) and located and fixed in the desired height above and on both sides of the pipe wall having an outer claw part with a fixed bit (16) on the inside of the core drill pipe (11) , and an inner claw part having a stamping piston (8) on the outside of the pipe (11) and adjacent the bit (16) , the tong (6) is activated and a first segment recess (17) is punched out, the pipe (11) is turned a predetermined angle, fixed, and the tong (6) is activated and a new segment recess is punched out, which is repeated around the whole circumference of the pipe, the tong (6) is thereafter moved vertically to a desired level, located and activated as described above, in the areas between the previosly punched segment recesses (17) , which areas has a width less than the width of the segment recesses (17), and new segments are thus stamped out around the complete circumference of the pipe, resulting in that the pipe (11) being cut and the segment recesses (17) formed in the cutting surface.

Inventors: HANSEN ARNE, HANSEN, ARNE
Applicants: HANSEN ARNE, UNIPRO AUTOMASJON AS, HANSEN, ARNE, UNIPRO AUTOMASJON A/S
Application year: 1995
Main classification: B21D28
IPC codes: B23D65, E21B10