GB2255299A - Concrete boring/cutting device with tool dressing means - Google Patents
Concrete boring/cutting device with tool dressing means Download PDFInfo
- Publication number
- GB2255299A GB2255299A GB9204507A GB9204507A GB2255299A GB 2255299 A GB2255299 A GB 2255299A GB 9204507 A GB9204507 A GB 9204507A GB 9204507 A GB9204507 A GB 9204507A GB 2255299 A GB2255299 A GB 2255299A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cutting
- abrasive
- boring
- workpiece
- tips
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 239000000463 material Substances 0.000 claims description 16
- 230000000694 effects Effects 0.000 claims description 14
- 239000002826 coolant Substances 0.000 claims description 9
- 239000010432 diamond Substances 0.000 claims description 9
- 229910003460 diamond Inorganic materials 0.000 claims description 9
- 238000005245 sintering Methods 0.000 claims description 3
- 238000005299 abrasion Methods 0.000 description 14
- 238000002474 experimental method Methods 0.000 description 10
- 230000003014 reinforcing effect Effects 0.000 description 9
- 238000001816 cooling Methods 0.000 description 7
- 230000001105 regulatory effect Effects 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 5
- 229910001651 emery Inorganic materials 0.000 description 4
- 230000002269 spontaneous effect Effects 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- 239000000498 cooling water Substances 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- 240000008042 Zea mays Species 0.000 description 1
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 1
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005255 carburizing Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000012809 cooling fluid Substances 0.000 description 1
- 235000005822 corn Nutrition 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/01—Arrangements for handling drilling fluids or cuttings outside the borehole, e.g. mud boxes
- E21B21/015—Means engaging the bore entrance, e.g. hoods for collecting dust
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D59/00—Accessories specially designed for sawing machines or sawing devices
- B23D59/02—Devices for lubricating or cooling circular saw blades
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B53/00—Devices or means for dressing or conditioning abrasive surfaces
- B24B53/013—Application of loose grinding agent as auxiliary tool during truing operation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
- B28D1/02—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing
- B28D1/025—Use, recovery or regeneration of abrasive mediums
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
- B28D1/02—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing
- B28D1/04—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing with circular or cylindrical saw-blades or saw-discs
- B28D1/041—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing with circular or cylindrical saw-blades or saw-discs with cylinder saws, e.g. trepanning; saw cylinders, e.g. having their cutting rim equipped with abrasive particles
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/16—Applying separate balls or pellets by the pressure of the drill, so-called shot-drilling
Description
2 2-3 52'9 1 BORING/CUTTING DEVICE FOR CONCRETE OR THE LIKE This invention
relates to a device for boring or cutting concrete or other rigid materials by use of a cutting tool such as a core drill and rotary cutter blade, and more particularly to a device adapted to bore or cut a concrete structure with reinforcing rods, which has a function of dressing abrasive cutting tips mounted on the cutting tool.
In forming a hole having a desired diameter in a rigid material (workpiece) such as concrete and stone, there has been usc--td a core drill consisting of a cylindri.cal cutter body provided with abrasive cutting tips, which is rotated to cut the workpiece while supplying a coolant such as air and water toward the abrasive cutting tips to decrease abrasion of the cutting tips and increase the cutting efficiency. Similarly, when the workpiece such as concrete is cut, a disc-shaped cutter blade provided on its circumferential edge portion with abrasive cutting tips is rotated to cut the workpiece while supplying air or water as a coolant toward the cutting tips.
It, The aforenoted abrasive cutting tip mounted on the core drill or rotary cutter blade is generally formed by sintering and binding diamond grains with binding material. In order to properly maintain the cutting property of the cutting tool having the cutting tips containing the diamond grains, the binding material with which the diamond grains are bound should be soon worn away after the diamond grains fall off in cutting the workpiece, so as to bare other diamond grains which are still buried in the binding material. The phenomenon that the diamond grains buried in the binding material of the cutting tip are bared is commonly called "spontaneous dressing" of the cutting tip.
Though a relatively soft concrete material can be 1 efficiently bored or cut since the spontaneous dressing of the cutting tips are moderately effected, it is however difficult for the conventional cutting tool to bore or cut a rigid concrete material with reinforcing rods with high efficiency. This is because the conventional cutting tool are easily worn to early flatten the cutting surfaces of the abrasive cutting tips due to falling of diamond grains from the cutting tips. In some cases, it is not possible to bore or cut the workpiece because blinding of the cutting tips cannot be avoided sponteneously.
Since cutting chips resultantly produced by cutting a i.
rigid s,-jorkpiece are fine and adhered to the binSing material constituting the cutting tips, the abrasive cutting tips lose not only a function of cutting, but also an effect of the spontaneous dressing. Besides, the blinding of the cutting tips by the fine cutting chips increases only frictional heat produced in cutting. Therefore, even if a cooling fluid such as water is applied to the cutting portion at which the workpiece is cut by the cutting tips, the cutting portion cannot be sufficiently cooled.
To eliminate the drawbacks suffered by the conventional cutting tool, the present invention offers a novel device capable of effectively boring or cutting a rigid workpiece such as concrete and stone without blinding of cutting tips, thereby to maintain the moderate cutting condition and increase the cutting efficiency of work involved in cutting the workpiece.
To attain the object described above according to this invention, there is provided a boring/cutting device comprising a cutting tool having cutting tips of ultrahard material, means for supplying a coolant to a cutting portion at which a workpiece is cut by the cutting tool, and means for supplying abrasive to the cutting portion to effect dressing of the cutting tips.
1 3 While rotating the cutting tool to cut the rigid workpiece, the coolant is applied to the cutting portion of the workpiece along with the abrasive, so as to cool the cutting portion and the cutting tool and effect the dressing of the cutting tips, thereby to increase the efficiency of cutting the workpiece.
As the cutting tool, a core drill or disc-shaped rotary cutter blade may be used.
1.0 An embodiment of the present invention will now be described by way of example with reference to the accompanying drawings, in which:- Figure 1 is a side view schematically showing one embodiment of the device having a core drill according to this invention, Figure 2 is an expanded sectional view showing the principal portion of the device of this invention, Figure 3 is a perspective view schematically showing the core drill used in this invention, Figure 4 is a schematic illustration of the cutting condition, Figure 5 is a perspective view of a workpiece to be cut under test, Figure 6 is a schematic illustration of the condition of cutting the workpiece of Figure 5, Figure 7 is a graph showing the effect of using abrasive in cutting, Figure 8 is a graph showing the relation along the supply of abrasive, boring speed and abrasion rate, and Figure 9 is a sectional view showing the principal portion of a moisture-type boring device of another 30 embodiment according to this invention.
A boring device is schematically shown as one embodiment of this invention in Figures 1 and 2. The illustrated boring device 2 comprises a basal body 6 having a core drill 4 as a cutting tool, a cutting chip- collecting device 8 for collecting cutting chips produced in boring a workpiece, an air supply device 10, and an abrasive supply device 1.2.
t 1 - 4 The core drill 4 is composed of a cylindrical core 14 having a fitting portion 14a to be attached to the basal body 6, and cutting tips 16 of ultra-hard material, which are mounted on the circumferential leading edge of the cylindrical core 14 at regular intervals, as shown in Figure 3. The cutting tip 16 is formed by sintering and binding diarcLond grains 16a with binding material 16b, as shown in Figure 4.
In this embodiment, air is supplied as a coolant through the hollow inside the cylindrical core 14 of the core drill 4. The distance 18 between the adjacent cutting tips 16 serves as a passage for the air supplied to inside the core drill 4 to enhance the effect of cooling the cutting tips and collecting the cutting chips produced in cutting the workpiece.
The basal body 6 has a supporting member 24 which is fixed on the workpiece C to be cut such as concrete by means of anchors 22, a frame member 26 supported movably upward and downward by the supporting member 24, and a motor 28 retained by the frame member 26 for rotating the core drill 4.
The cutting chip-collecting device 8 has a chip collector 30, a head cover 32 surrounding the cutting portion of the workpiece, through which the core drill 4 is rotatably inserted, and a conduit pipe 34 for connecting the chip collector 30 and the head cover 32. The air supply device 10 has an air compressor 36 and an air supply pipe 40 for connecting the interior of the core drill 4 to the air compressor 36 through a horizontal air passage 38a and a vertical air passage 38b formed in a driving shaft 38. The reference numeral 42 denotes a seal member.
The abrasive supply device 12 has an abrasive tank 44 for containing abrasive K, an abrasive supply passage 46 for connecting the air supply pipe 40 and the abrasive tank r 44, a.r7d a regulating valve 48 mounted on the abrasive supply passage 46.
Next, the process of cutting the concrete workpiece C by using the boring device according to this invention will be explained.
The core drill 4 is moved downwardly toward the concrete workpiece C while being rotated. The rotating core drill 4 is thrust into the workpiece C to make a hole. At this time, the cooling air A is supplied from the air supply device 10 to the inside of the core drill 4 through the air passages 38a and 38b in the driving shaft 38. By the air A thus supplied to inside the core drill 4, the rotating cutting tips 16 which produce frictional heat are cooled and the fine cutting chips D produced resultantly by boring the workpiece are removed outward. The air A discharged from the core drill 4 together with the cutting chips D is caught by the head cover 32 and drawn by the chip collector 30 through the conduit pipe 34.
In boring the workpiece, the regulating valve 48 of the abrasive supply device 12 is operated to introduce an adequate quantity of abrasive K into the air supply pipe 40 through the abrasive supply passage 46. The abrasive K introduced through the pipe 40 is supplied into the inside of the core drill 4 toward the cutting portion of the workpiece C. The air A with the abrasive K flows through a circular groove Cg formed in the workpiece and a space Cf formed between the outer surface of the groove Cg and the outer surface of the core drill 4 (upper surface of the workpiece at the beginning of boring).
By the action of the abrasive K supplied to the cutting portion of the workpiece, the efficiency of cutting the workpiece is remoted, and besides, the dressing of the cutting tips 16 is automatically carried out to further heighten the cutting efficiency. That is, the rigid 6 workpiece can be effectively bored without deteriorating the cutting quality of the cutting tips, and moreover, the service life of the cutting tool can be remarkably lengthened. The abrasive thus supplied is drawn by the 5 chip collector 30 along with the cooling air.
In the experiment the inventors actually conducted, a hole of 200 mrn in depth could be formed for 6 minutes in a concrete block with reinforcing rods by use of the boring device according to this invention. Furthermore, the cutting quality of the cutting tool 16 could be maintained in successive cutting works.
On the other hand, though the same concrete block was drilled by using a conventional core drill in the experiment under the same conditions, the conventional core drill early became dull and was made it impossible to reuse.
The results of the aforenoted comparative experiment will be described in detail hereinbelow.
Various kinds of hard particles such as alumina, silicon carbide, foundry sand and other grinding powders can be used as the abrasive when boring the concrete material by using the device of this invention. In the experiment actually conducted, alumina being 0.03 mm. to 0.09 mm. in grain size was used as the abrasive K and introduced into the air supply pipe 40 at a rate of 2 g to 15 g per minute by operating the regulating valve 48. The abrasive K was supplied along with the cooling air to the cutting portion Cp at which the workpiece is bored.
Supplying the abrasive K to the cutting portion Cp, the binding material 16b of the respective cutting tips 16 mounted along the leading edge of the corn drill 4 comes in contact with the abrasive K as shown in Figure 6, thereby to effect the spontaneous dressing. As a result, the cutting quality of the cutting tips 16 could be maintained.
As a specimen for the experiment, there was used a concrete block (workpiece C) having a section of a 200 mm square and a length of 1000 mm and provided inside with three reinforcing rods R, as shown in Figure 5. A drilling machine rated at 15 A and provided with a core dri ll having an inner diameter of 4 inches was used. The direction in which the core drill advances toward the workpiece is indicated by the arrow W in the drawing. It was confirmed experimentally that the effects of dressing and cooling the cutting tips could be effectively achieved and the cutting efficiency was remarkably improved. The abrasive after being functioned was discharged outside from the core drill and was drawn along with the cooling air A and cutting chips D produced resultantly through the conduit pipe 34 by the chip-collecting device 8.
TABLE 1 below shows the experimental results of the abrasion of the cutting tips and boring property which vary with the change in grain size of alumina used as the abrasive. The workpiece specimen used in the experiment is substantially identical with that shown in Figure 5. The drilling machine is also the same as described above.
j 8 TABLE 1
Grain Size 0.7-0.3 0.3-0.1 5 0.15-0.09 I 0.3-0.09 Boring Time to pierce (min) 8.7 9.8 11.3 10.7 Boring Rate (mm/min) 23 20 18 19 Abrasion of Depth (mm) 1.2 0.4 0.04 0.05 Cutting Tip Rate (pm[min) 140 30 3 4 Grade of Abrasion Resistance D C A B Grade of BoriDg Property A A Grade: A-Excellent B..Good C..Fair D..Bad As is evident from TABLE 1, when the grain size of the abrasive is over 0. 3 mm, the boring property can be maintained, whereas the cutting tips are worn out notably due to the excess dressing action of the abrasive. Thus, the boring device which is driven under this condition is disadvantageous in maintenance cost. However, when the abrasive has a grain size of about 0.4 mm to about 0.5 mm and uniform in grain size, satisfactory results on abrasion and excellent boring property can be obtained.
When the grain size of the abrasive is within the range of 0. 3 mm to 0. 15 mm or 0. 15 mm to 0. 09 mm, there is little difference therebetween in dressing effect and boring efficiency. Accordingly, it can be concluded that the abrasive of 0.3 mm to 0.09 mm in grain size is most suitable from the standpoint of maintenance cost. In the case of the abrasive having a grain size below 0.09 mm, the dressing effect is notably decreased since the grain size is too small to contribute to the cutting tips.
The change of the boring speed in use of the abrasive K is indicated by the solid line H in Figure 7. As is apparent from this drawing, the boring speed is slightly decreased where the cutting tips are brought in touch with the reinforcing rods in the concrete specimen, while the reinforcing rods are however cut by the aid of the abrasive.
9 The results of another experiment to prove the abrasion resistance and boring property of the cutting tips which vary with the abrasives of different kinds are shown in TABLE 2 below. I TABLE 2
Abrasive Alumina Emery Carbo- Morundum Quartz rundum Sand Boring Time to pierce (min) 10.7 15.5 14.2 16.5 Boring Rate (mm/min) 19 13 14 12 -Abrasion of Depth (irtim) 0.05 0.1 0.2 0.1 0.05 Cutting Tip Rate (pm/min) 4 10 25 7 4 Grade of Abrasion Resistance A A C B A Grade of Boring Property A B A B C rty rty Grade: A-Excellent B..Good C..Bad Remarks: Carborundum is the trademark of Norton, Ltd.
Morundum is the trademark of Showa Denko K.K.
() in "Boring Time" means that the workpiece was not pierced.
As is clear from TABLE 2 above, the boring property does not largely vary according to the kind of the abrasive K applied in boring. Therefore, any abrasive may be used properly if each grain thereof has a rough and angular surface. The abrasive having a smooth and rounded surface 10 such as quartz sand or a slender shape is not suitable. Taking careful observations respecting the cutting Taking careful observations respecting the cutting condition, the diamond grains buried in the cutting tip are carbonized due to the heat produced in cutting, are carbonized due to the heat produced in cutting, thereby carburizing the reinforcing rod in the concrete workpiece to harden the reinforcing rod. Therefore, since the reinforcing rod cannot be easily cut in this case, it is desirable to use the abrasive K being low in carbon.
When the supply of the abrasive is too much, the service life of the cutting tips 16 are shortened due to the - excessive dressing effect of the abrasive on the cutting tips. In contrast with this, when the supplv of the abrasive is too little, the dressing effect of the abrasive becomes weak to cause seizure of the cutting tips. Figure 8 shows the results of the experiment in which the boring was carried out while supplying the abrasive K of 150 g/min to 0.5 g/min with cooling air. As is plain from the graph of Figure 8, when the supply of the abrasive K is too little as indicated by the region S1 in the drawing, the dressing effect is insufficient. When the abrasive is excessively supplied as indicated by the region S3, the cutting tips 16 are swiftly worn.
When the abrasiveK is supplied at the rate within S2, the 15 abrasion rate of the cutting tips can be reduced and the boring rate becomes appropriate. Consequently, the supply.of the abrasive K per minute can be determined to 0.5 g to 20 g, most preferably, 2 g to 15 g.
The following TABLE 3 shows the experimental data representing the abrasion rate of the cutting tips with the change in occupancy rate of the cutting tips to the entire area of the circumference of the disc- shaped rotary cutting blade of the core drill.
TABLE 3
Occupancy Rate of Tips 75% 50% 38% 33% 24% Boring Time to pierce (min) 13.3 11.3 10.7 Boring Rate (mm/min) 15.1 17.6 18.7 Abrasion of Depth (mm) 0.2 0.1 0.05 Cutting Tip Rate (pm/min) 25 7 4 Grade of Abrasion Resistance A A C Grade of Boring Property D D B A A Grade: A Excellent B Good C Fair D Bad () in nBoring Timen means that the workpiece was not pierced.
1 i It can be determined from TABLE 3 above that when the occupancy rate of the cutting tips to the entire circumferential area of the rotary cutting blade is too large, the rate at which the cutting chips produced in boring is decreased to deteriorate the boring efficiency. On the contrary, when the occupancy rate of the same is too low, the abrasion rate becomes high, and therefore, it is uneconomical to use the cutting blad.e having small cutting tips.
TABLE 4 shows the experimental data representing the supply of the abrasive K and the boring time in using the core drill smaller than the aforenoted core drill having a 4-inch diameter. In this experiment, the similar concrete block was used as a specimen, and the occupancy rate of the cutting tips was 35%.
TABLE 4
Diameter of Core Drill 1 3" #1 31' #2 31' #3 Hole of 40mm Boring Time to pierce (min) 9.9 7.6 12 9.7 Boring Rate (mm/min) 20 26 17 20 Supply of Abrasive (g/min) 6.05 2.62 14.1 5.7 (Emery) (Emery) (Emery) (Alumina) It can be expected from TABLE 4 above that the supply of the abrasive is not closely connected with the diameter of the core drill. That is, the optimum supply of abrasive 20 in the experiment was within 2 g to 15 g.
1 Though the core drill of a dry-coolant type is shown in the aforenoted embodiment by way of example, the system described above can be of course applied to a moisture- coolant type core drill, a rotary cutter blade or any other types of cutting tools.
i 1 i 1 1 12 Also in the aforenoted embodiment, one abrasive tank 44 is used for supplying the abrasive to one cutting system (core drill 4). However, a plurality of cutting systems can be used and simultaneously supplied with the abrasive from one abrasive tank 44. In this case, the abrasive to be fed to the respective cutting systems may be regulated properly.
Although the abrasive supply device 12 is disposed on the air supply pipe 40 to supply the abrasive with the air A, this structure is by no means limitative and the abrasive may be manually supplied to the cutting portion on the workpiece.
Figure 9 illustrates another embodiment of a moisture-type using cooling water. In this drawing, the reference numerals which have equivalents in the drawings of the embodiment noted above denote identical or equal component parts. The description of these component parts is omitted below to avoid repetition.
To the driving shaft 38, there is connected a water supply pipe 60 for supplying cooling water. On the water supply pipe 60, the abrasive supply device 12 is connected via the pipe 46. The abrasive K from the abrasive supply device 12 is regu lated by the regulating valve 48 disposed on the pipe 46 and supplied together with water W to the cutting portion Cf. -The dressing effect on the cutting tips which is brought about by the abrasive thus supplied can be expected similarly to the former embodiment described above.
Though, in this embodiment, the core drill is used as a boring or cutting means by way of example, any other cutting means such as a rotary cutting blade can be of course used instead.
As is apparent from the foregoing, according to this Pr k, 13 invention there can be provided a boring/cutting device capable of effectively working a rigid workpiece such as concrete and stone without blinding of cutting tips, thereby to maintain the moderate cutting condition and increase the cutting efficiency of work involved in cutting the workpiece.
As many apparently widely different embodiments of this invention may be made without departing from the spirit and scope thereof, it is to be understood that the invention is not limited to the specific embodiments thereof except as defined in the appended claims.
14
Claims (7)
1. A boring/cutting device comprising a cutting tool having cutting tips, means for supplying a coolant to a cutting portion at which a workpiece is cut by said cutting tool, and means for supplying abrasive to said cutting portion to effect dressing of said cutting tips.
2. A boring/cutting device according to claim 1, wherein said abrasive has a grain size of about 0.4 mm to about 0.5 min, preferably 0.3 win to 0.09 mm, and is supplied at the rate of 0.5 g/min to 20 g/min, preferably 2 g/min to 15 9/min.
3. A boring/cutting device according to claim 2, wherein said abrasive is supplied together with a coolant.
4. A boring/cutting device according to claim 1, wherein said cutting tip is formed by sintering and binding diamond grains with binding material.
5. A boring/cutting device according to claim 1, wherein said cutting tool is a core drill having a cylindrical core, and said cutting tips are made of ultra-hard material and mounted on the circumferential leading edge of said cylindrical core at regular intervals.
6. A boring/cutting device according to claim 1, wherein said cutting tool is a disc-shaped cutter blade and said cutting tips are mounted on the circumferential edge portion of said cutter blade.
7. A boring/cutting device substantially as herein described with reference to Figures 1 to 3, and Figure 9 of the accompanying drawings.
1 i i i i W
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8694091A JPH04319408A (en) | 1991-04-18 | 1991-04-18 | Drilling method by core drill |
| JP21520191A JPH0550421A (en) | 1991-08-27 | 1991-08-27 | Cutting method of concrete |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9204507D0 GB9204507D0 (en) | 1992-04-15 |
| GB2255299A true GB2255299A (en) | 1992-11-04 |
Family
ID=26428012
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9204507A Withdrawn GB2255299A (en) | 1991-04-18 | 1992-03-02 | Concrete boring/cutting device with tool dressing means |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE4208722A1 (en) |
| GB (1) | GB2255299A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1249481A2 (en) * | 2001-04-11 | 2002-10-16 | Mitsubishi Materials Corporation | Abrasive and boring method using the same |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1156082A (en) * | 1966-02-08 | 1969-06-25 | Rech S Geol Et Minieres Bureau | Improvements in Methods for Resharpening Rotary Drill Bits of Composite Type. |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE8711846U1 (en) * | 1986-09-03 | 1987-11-05 | Toepfer, Rainer, 2802 Ottersberg, De |
-
1992
- 1992-03-02 GB GB9204507A patent/GB2255299A/en not_active Withdrawn
- 1992-03-18 DE DE4208722A patent/DE4208722A1/en not_active Ceased
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1156082A (en) * | 1966-02-08 | 1969-06-25 | Rech S Geol Et Minieres Bureau | Improvements in Methods for Resharpening Rotary Drill Bits of Composite Type. |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1249481A2 (en) * | 2001-04-11 | 2002-10-16 | Mitsubishi Materials Corporation | Abrasive and boring method using the same |
| EP1249481A3 (en) * | 2001-04-11 | 2003-07-16 | Mitsubishi Materials Corporation | Abrasive and boring method using the same |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9204507D0 (en) | 1992-04-15 |
| DE4208722A1 (en) | 1993-02-04 |
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