JP6025107B1 - Cylindrical grinding wheel - Google Patents

Abstract

[PROBLEMS] In particular, in the drilling of holes in thin to thick plates, the minimum grinding waste, the efficiency of coolant in the grinding wheel, the efficiency of grinding dust discharge, and the improvement of grinding efficiency by shortening the grinding time are achieved. Relates to the new grinding wheel. SOLUTION: A cylindrical body 3 formed in a cylinder, and grooves 3B and 3H connected from an inner peripheral surface 3A of the cylindrical body to an outer peripheral surface 3F via a distal end surface 3S are directed toward an axial direction O of the cylindrical body. A plurality of recesses are formed on the surface, and diamond, CBN electrodeposited abrasive grains or WA, GC abrasive grains G are fixed to the front end surface of the cylindrical body and the peripheral portion 3I, and grinding fluid is applied from the rear end surface of the cylindrical body. GO is a cylindrical grinding wheel 2 that supplies grinding gas to the groove on the inner peripheral surface and ejects it from the tip surface to cool the grinding point and discharge chips from the groove on the outer peripheral surface. [Selection] Figure 1

Description

  The present invention relates to an improvement of a grinding tool (such as a cup grindstone or a cylindrical grindstone) to be rotated and a grinding tool that enables drilling and the like under optimum use conditions in a drilling method using the grinding tool. In particular, in the drilling of holes in thin to thick plates, a new material that has improved grinding efficiency by minimizing grinding scraps, increasing the efficiency of coolant fluid in the grinding wheel, increasing grinding waste discharge efficiency, and shortening the grinding time The present invention relates to drilling of a cup cylindrical grinding wheel and a cylindrical grinding wheel.

  In recent years, in the cutting and grinding fields, a method for efficiently opening a through-hole in various plate materials is used for a plurality of water-passing holes on the peripheral side surface of a hollow cylindrical cup grindstone body having a grindstone portion on a side end surface. There is a grinding cup grindstone in which long hole portions are provided by drilling (see, for example, Patent Document 1).

  Furthermore, in the field of concrete buildings with different industrial fields, there are core drills that are frequently used for concrete processing. One known example of this core drill is to forcibly guide the abrasive supplied from the base of the cylindrical core to the inside of the core to avoid cutting and accumulation inside the core, thereby reducing supply loss. At the same time, the cutting efficiency is improved. Specifically, the core drill 4 includes a cylindrical core 14 attached to the apparatus main body 6 by means such as screwing, and a guide member 16 provided on a work surface F such as concrete inside the cylindrical core 14. It consists of. Cutting tips 18 are arranged at equal intervals in the circumferential direction at the distal end 14a of the cylindrical core 14, and a supply port 20 for introducing the abrasive K into the core together with cooling air is formed in the base portion 14b. ing. The guide member 16 is formed in a substantially conical shape that spreads toward the tip side of the cylindrical core 14, and has a mounting surface 16 a on the work surface F and a guide slope 16 b that guides the abrasive K. (For example, refer to Patent Document 2).

  Furthermore, in a core drill 23 having a core drill body 24 having a cylindrical wall 24a and a plurality of drilling blades 25 provided at the distal end of the core drill body 24, the core drill body 24 has a cut extending from the distal end toward the proximal end. The powder discharge groove 26 is formed so as to penetrate the cylindrical wall 24a, and the drilling direction dimension L1 of the chip discharge groove 26 is set larger than the drilling depth D1 (FIG. 10) with respect to the drilling target (for example, (See Patent Document 3).

  Japanese Utility Model Publication No. 2-53367   Japanese Utility Model Publication No. 5-35217   Japanese Patent Laying-Open No. 2015-3426

  The Japanese Utility Model Laid-Open No. 2-53367 is a grinding cup grindstone in which a plurality of water-passing long hole portions are drilled and arranged on the peripheral side surface of a hollow cylindrical cup grindstone body. Thus, in comparison, in the through-hole processing of the hole in the thin plate, it can be expected to cool the tip blade portion from the plurality of water passage long hole portions and discharge grinding waste. However, in the drilling of holes from a certain thickness to a thick plate, the minimum amount of grinding waste is generated, the efficiency of discharging this grinding waste is increased, and the coolant is supplied and discharged through the grinding wheel efficiently to the cutting edge. There is a problem that it is inferior. Therefore, it is impossible to improve the grinding efficiency by increasing the machining efficiency and shortening the grinding time in the drilling of the hole in the thick plate.

  Furthermore, the above-mentioned Japanese Utility Model Publication No. 5-35217 is a core drill for pulverizing concrete, and forcibly guides the abrasive to the cutting site and avoids stagnation or accumulation inside the core to reduce supply loss. It is said to improve cutting efficiency. However, when drilling a metal material, especially a carbon fiber reinforced plastic plate, it is a structure of a carbon fiber reinforced plastic plate in which the fiber direction is laminated with a sheet material made of a sheet of carbon fiber yarns, When normal processing is performed with the core drill, the cut carbon fiber yarn group is entangled with the cutting tool (cutting tip), and accurate drilling cannot be performed. Furthermore, since the abrasive is sprayed with compressed air and supplied into the core from the base of the cylindrical core (distant from the processing point), it is diffused and stays inside the core, and the guide slope that guides the abrasive K Even if it has, it is not guided to a cutting part effectively. In particular, during deep hole machining, the mist-like abrasive (only reaching compressed air) is difficult to reach a deep machining point, and there remains a problem that improvement in cutting efficiency cannot be expected. In addition, since the compressed air that reaches the deep hole cutting tip is sucked by the suction pipe, the abrasive material does not stay at the tip of the tip and only passes at a high speed. Lubricant cooling (reduction of frictional resistance, heat removal, etc.) by the abrasive is not expected and is forced to be reduced.

  Further, JP-A-2015-3426 is a core drill, and a chip discharge groove extending from the distal end to the base end is formed in the core drill main body in a manner penetrating the cylindrical wall, and the chip discharge groove The dimension of the drilling direction is set to be larger than the drilling depth for the drilling object, thereby increasing the efficiency of chip discharge. However, since the chip discharge groove is formed by spirally penetrating the cylindrical wall of the core drill body, it is assumed that there is a chip discharge effect at first glance. Is not supplied, and the cooling action against the heat generated at the processing point cannot be obtained. Furthermore, since the positive discharging action of chips can be obtained only at the time of drill rotation, and since it is governed by the number of rotations of the drill, there is no guarantee that the discharging action can be obtained efficiently in all rotation regions. Etc. still remain.

As a result of continuing research and development in view of various problems seen when drilling and drilling thick plates and concrete with cylindrical blades such as the above-mentioned cup grindstone and core drill, the following specific solutions Turned out to be essential. That is,
(1) In the drilling of holes from thin plates to thick plates, the efficiency of the coolant liquid at the processing and grinding points is increased, the efficiency of discharging grinding scraps is improved, and the grinding efficiency is improved by shortening the grinding time. Development of grinding wheel (hereinafter referred to as cup cylinder grinding wheel).
(2) In the drilling of thick plate holes with a cup grindstone, the generation of the minimum amount of grinding waste and the discharge efficiency of this grinding waste is improved. By doing this, machining efficiency can be increased and grinding time can be shortened.
(3) Improved cutting of CFRP, which is weak in the direction perpendicular to the linear direction of carbon fiber yarn, as well as general metal plate and concrete.
(4) It is possible to rationally collect the dust that becomes cutting waste and grinding waste and to preserve the environment.

The present invention is summarized to the following two purposes when the solutions (1) to (4) are comprehensively summarized in the processing by the cup cylindrical grinding wheel and the cylindrical grinding wheel.
The purpose is to minimize the amount of grinding scrap, increase the efficiency of coolant supply from the through-hole inside the grinding wheel to the cutting edge, increase the efficiency of discharging the grinding scrap, and shorten the grinding time. In order to improve the grinding efficiency, a novel cup cylindrical grinding wheel and a cylindrical grinding wheel are provided.

The cylindrical grinding wheel according to claim 1, which achieves the above object, includes a double cylinder in which a large-diameter cylinder and a small-diameter cylinder having different inner and outer diameters and cylinder lengths are fitted to each other. Each cylindrical body has an annular space between inner and outer peripheral walls formed of a thin plate material having two sheets, and a large-diameter cylindrical body is integrally fitted to the outer peripheral wall surface of the small-diameter cylindrical body, and each cylindrical tip portion A long tube of a small-diameter cylindrical body in which a plurality of partition walls are provided at equal intervals over the entire circumference of the circular cylinder in the annular core direction in each annular space of the double cylinder. And a structure of a short pipe of a large-diameter cylindrical body, and a through hole is formed between each partition wall of the long pipe and the short pipe, and an opening provided at the front and rear ends of the through holes of the long pipe and the short pipe And an arbor having a communication hole and a center hole for holding the rear end side of the double cylinder and flowing the grinding liquid or coolant liquid into each opening of the rear end of the long pipe Characterized by comprising a.

The cylindrical grinding wheel according to claim 2 is a cylindrical body in which a plurality of pipes having through holes are bundled into a cylindrical shape to form a pipe group, and a plurality of grinding liquids or coolant liquids are supplied to the tip machining point. A discharge short pipe provided with one or several pipes each having a short tip and a rear end with a gap between the long pipes, and an abrasive grain fixed to the tip of the long pipe, An arbor that holds the inner side of the rear end of the cylindrical body and connects a center hole to each through hole that opens to the rear end side of each long pipe, and that flows in the grinding liquid or coolant liquid from each of the through holes. And

  The cup cylinder grinding wheel and cylindrical body grinding wheel of the present invention can improve the efficiency of the coolant liquid to the processing point and grinding point, increase the efficiency of grinding waste discharge, Grinding efficiency can be improved by shortening.

  In the drilling of holes in thick plates with cup cylindrical grinding wheels and cylindrical grinding wheels, the minimum amount of grinding scrap is generated and the efficiency of discharging the grinding scrap is increased. The coolant is efficiently ejected to the cutting edge through the grinding wheel. By improving the grinding efficiency, the processing efficiency can be increased and the grinding time can be shortened. In addition to drilling holes in general metal plates and concrete, cutting in CFRP with weak strength can be improved in the direction perpendicular to the linear direction of the carbon fiber yarn.

  Furthermore, it is possible to rationally collect the dust that becomes cutting scraps and grinding scraps and to protect the environment. That is, there is no peeling of the abrasive grains during grinding, and the grinding liquid can penetrate (wet) the surface of the cutting edge abrasive grains from the inside of the cutting edge. That is, when drilling a deep hole, the grinding liquid can reliably reach the cutting edge. Therefore, the grinding wheel edge (abrasive grain) always fills the grinding fluid from the internal grooves and holes, and the blade edge cooling effect, grinding dust discharge effect, reduction effect of grinding resistance, heat generation reduction effect, grinding efficiency improvement effect, etc. are great. I can expect.

  1 shows a first embodiment of the present invention and is a perspective view of a cylindrical grinding wheel. FIG.   BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a first embodiment of the present invention, and is a sectional view and a front end view of a cylindrical grinding wheel.   It is sectional drawing which assembled | attached the arbor on the cylindrical grinding wheel.   It is sectional drawing, front view, and front end view which assembled | attached the cylindrical body grinding grindstone to the tool holder.   FIG. 2 is an operation diagram of the cylindrical grinding wheel according to the first embodiment of the present invention.   It is a perspective view of a cup cylinder grinding grindstone which shows a 2nd embodiment of the present invention.   It is sectional drawing and the front view which assembled | attached the cup cylinder grinding grindstone to the tool holder.   The 3rd Embodiment of this invention is shown, and it is sectional drawing and a front end view of a cylindrical grinding wheel.   It is an effect | action figure in the 3rd and 4th embodiment of this invention.   It is a front view of a cylindrical grinding wheel showing a fourth embodiment of the present invention.   FIG. 10 is a sectional view showing the operation of a cylindrical grinding wheel according to a fourth embodiment of the present invention.   FIG. 4 shows each embodiment of the present invention, and is a structure and action diagram of a grinding fluid supply / recovery path.   It is a manufacturing-process figure of the cylindrical body of 1st and 2nd embodiment.

  Hereinafter, with reference to FIG. 1 thru | or FIG. 13, the cylindrical grinding wheel and cup cylindrical grinding wheel which become each embodiment of this invention, and the processing method by these grinding stones are demonstrated sequentially.

  The configuration and operation of the cylindrical grinding wheel 2 according to the first embodiment of the present invention will be described with reference to FIGS. First, in FIGS. 1 and 2, the material of the cylindrical grinding wheel 2 is composed of a cylindrical body 3 in which a thin plate material is formed into a cylinder. Semicircular grooves 3B and 3C are recessed over the entire length in the axial direction O at two opposing positions on the inner peripheral surface 3A of the cup cylinder, and the tips of the grooves 3B and 3C are The cup cylinder 3 is connected to the notch 3E of the tip surface 3S. Furthermore, grooves 3G and 3H are recessed in the axial direction O along the entire length on the outer peripheral surface 3F connected to the concave side of the notch 3E. The relative positions of the grooves 3B and 3C and the grooves 3G and 3H are arranged apart from both end edges of the notch 3E. Thereby, even if the thin plate material of the cup cylinder 3 is thin, the two grooves 3B and 3H and the grooves 3C and 3G arranged inside and outside are separated from each other, so that they do not interfere with each other. Thus, the grinding fluid GO or the grinding gas and the coolant fluid CO flowing through the two 3B and 3C of the inner peripheral surface 3A are sent out to the grooves 3G and 3H of the outer peripheral surface 3F in a form passing through the notch 3E. Two paths are formed.

  The notch 3E and the inner and outer grooves are arranged at the target position of 180 ° in FIGS. 1 and 2, but a plurality of sets are provided at intervals of rotation angles of 90 °, 45 °, 30 °, etc. A set may be arranged. Cutting edge abrasive grains G such as diamond, CBN electrodeposited abrasive grains or WA, GC abrasive grains are fixed to the front end surface 3S, the notch 3E, and the peripheral portion 3I inside and outside of the cup cylinder 3 which are opened. Yes. As shown in FIG. 3, the rear end surface of the cup cylinder 3 is joined and supported by the fitting portion 4 </ b> A of the arbor 4. The arbor 4 has a center hole h1 and a rear end serving as a coupling shaft 4B with the tool holder H.

  As shown in FIG. 4, the cylindrical grinding wheel 2 is mounted at the tip of the arbor 4, the coupling shaft 4B is held by the tool holder H, and the grinding fluid GO or coolant is supplied by the center through from the main shaft of the processing machine. The liquid CO is supplied from the center hole h 1 of the arbor 4 into the inner peripheral surface 3 A of the cylindrical grinding wheel 2. Subsequently, as shown in FIG. 5, a drilling grinding operation (cutting operation) is performed on the workpiece W such as a metal plate material or a concrete block. As shown in FIG. 5, first, when the grinding fluid GO or the grinding gas and the coolant fluid CO are supplied from the spindle center through (not shown) of the processing machine, the cylindrical grinding wheel 2 is passed through the center hole h1 of the arbor 4. Is injected into the inside. This jet flow is a grinding fluid GO or a grinding gas and a coolant liquid CO, and is injected into the cylindrical body 3 and is supplied to both grooves 3B and 3C, and the outer peripheral surface of the front end surface 3S via this notch 3E. A circulation system is formed which is ejected into the grooves 3G and 3H on the surface 3F.

  That is, the cylindrical grinding wheel 2 starts ring-shaped hole machining on the workpiece W by the cutting edge abrasive grains G of the tip surface 3S, the cutout portion 3E, and the inner and outer peripheral portions 3I by the rotation of the tool holder H. At the same time, the grinding fluid GO or the grinding gas and the coolant liquid CO are injected into the cup cylinder grinding wheel 2 from the center hole h1 of the arbor 4. This jet flow is supplied to both grooves 3B and 3C of the inner peripheral surface 3A, and forms a circulation system that jets into the grooves 3G and 3H of the outer peripheral surface 3F via the tip surface 3S and the notch 3E. Thus, while performing the ring-shaped hole machining on the workpiece W, the cutting edge abrasive grain G and the peripheral portion 3I of the tip surface 3S are cooled to eliminate the cutting waste and increase the cutting efficiency. On the other hand, ring-shaped hole machining is completed smoothly. When the drilling is completed, the through hole is opened, the cylindrical residue G0 is dropped off, and efficient drilling is executed in a short time.

  In the drilling of holes from a thin plate to a thick plate with the cylindrical grinding wheel 2, the minimum amount of grinding waste is generated and the efficiency of discharging the grinding waste is increased. By jetting and improving the grinding efficiency, the processing efficiency can be increased and the grinding time can be shortened.

  In the cylindrical grinding wheel 2, the arbor 4 is kept secret at the rear end opening, but as shown in FIG. 6, a cup cylinder in which the rear end opening of the cylindrical grinding wheel 2 is closed with a closing plate 5 a. A grinding wheel 5 may be used. In the cup cylinder grinding wheel 5 of the second embodiment, a mounting hole 5b is formed at the center position of the closing plate 5a at the rear end in FIG. The closing plate 5a of the cup cylinder grinding grindstone 5 is screwed into the mounting screw hole 4b through the bolt B through the hole 1a of the seat plate 1 to be attached to the large diameter fitting hole 4a of the arbor 4. As shown in FIG. 7A, a center hole h1 is opened at the center of the arbor 4, and the grinding fluid GO or the grinding gas and the coolant fluid CO are ground through the center hole Bb of the bolt B. It is injected into the grindstone 5. Accordingly, as shown in FIG. 7A, the grinding fluid GO or the grinding gas and the coolant fluid CO are sprayed from the inner peripheral surface of the cup cylindrical grinding wheel 5 attached to the tool holder H toward the tip.

  Also in the cup cylindrical grinding wheel 5, the same effect as that of the cylindrical grinding wheel 2 can be obtained, and thus the description thereof is omitted. The grooves 5B and 5C, the tip surface 5S, the notch portion 5E, the outer peripheral surface 5F, the grooves 5G and 5H, and the peripheral portion 5I.

Furthermore, as shown in FIG. 8, the cylindrical grinding wheel 8 of the third embodiment is a double cylinder 8X in which annular cylinders 8A and 8B having different outer diameters and cylinder lengths are fitted. In each annular space S, S of the cylindrical body, a plurality of partition walls P are provided at equal intervals over the entire circumference of the circle toward the axial direction O of the cylindrical body, thereby constituting a long pipe 8L and a short pipe 8S. . Thus, a plurality of through holes h7, h8 are formed in the gaps of the plurality of partition walls P of the double cylinder 8X , and the opening and the opening of the short tube 8S are formed at the front and rear ends of the through holes. Openings 8M and 8N are provided in the 8C and 8D and the long tube 8L . Each opening 8N of each hole h8 that between the partition walls of the long pipe 8L is formed is coupled with communication hole h2 which is branched into a plurality of center holes h1 arbor 4, grinding fluid G0 also from the respective openings 8N Allows inflow of grinding gas and coolant liquid C0 . As a result, chips, grinding gas, and coolant liquid at the processing point are blown off from the tip hole 8M of the long pipe 8L, and subsequently flown into the tip opening 8C of the short pipe 8S, and from the through hole h7 of the rear end opening 8D. It was set as the structure discharged | emitted. Other configurations are the same as the configuration of the cylindrical grinding wheel 2 according to the first embodiment, and the description thereof is omitted. Of course, as shown in FIG. 6, the cylindrical grinding wheel 8 of the third embodiment may be a cylindrical grinding wheel in which the rear end opening of the cylindrical grinding wheel 2 is closed with a closing plate 5a.

Furthermore, the cylindrical grinding wheel 6 of the fourth embodiment is replaced with the double cylindrical body 8X in which the cylindrical bodies 8A and 8B are fitted in the cylindrical grinding wheel 8 of the third embodiment, as shown in FIGS. As shown in FIG. 11, a tube body group is formed by alternately bundling a large number of long tubes 6A having through holes h and a small number of short tubes 6B . And then it offers a short pipe 6B of one to present several short for leading edge and the trailing edge at intervals to the long tube 6A. The through hole h on the rear end side of the long tube group is connected to the branch hole h0 branched from the center hole h1 of the arbor 4, and the grinding liquid G0 or the grinding gas and the coolant liquid C0 are supplied from the rear end side of the through hole. It is configured to be able to flow in, and the chips, grinding gas and coolant liquid at the machining point are sucked from the front end hole h of the short pipe 6B and discharged from the rear end hole h of the short pipe. 10A and 11 show a state in which the tool holder 4 and the tube groups 6A and 6B are separated. FIG. 10B shows the assembled state. FIG. 10C shows a cross section of the long tube 6 </ b> A, the short tube 6 </ b> B, and the arbor 4. In addition, as shown in FIG. 6, it is good also as a cylindrical grinding wheel with which the rear-end opening part of the cylindrical grinding wheel 2 was obstruct | occluded with the obstruction board 5a.

The cylindrical grinding wheel 6 of the fourth embodiment has substantially the same operational effects as the cylindrical grinding wheel 8 of the third embodiment. That is, with reference to FIG. 9, the drilling work on the workpiece W including the cylindrical grinding wheel 8 and the cup cylindrical grinding wheel of the third embodiment will be described. First, in FIG. 9A, the grinding wheel 6 (8) attached to the tool holder H is sent to the workpiece W side while rotating, and a long tube body group is supplied with the grinding fluid G0 or the grinding gas and the coolant fluid C0. 6A is sent from the through hole h on the rear end side to the front end and sprayed toward the workpiece W. 9B, the groove W1 including the circular groove machining W1 and the grinding fluid G0 or the grinding gas and the coolant liquid C0 are processed from the long pipe group 6A. Bounces through and eliminates chips and dust. Further, as shown in FIG. 9C, when the groove processing W1 advances and the cutting edge abrasive grain D of the short pipe 6B also starts the groove processing W1, the grinding fluid G0 or the grinding gas and the coolant fluid C0 are processed from the long tube body group 6A. The inside of the short pipe 6B flows backward from the tip through the finished groove W1, and is discharged to the outside as sludge J containing processed chips and dust from the upper end of the short pipe 6B. Further, the grinding wheel 3D is fed to the workpiece W side while rotating. Finally, as shown in FIG. 9 (f), the cutting edge abrasive grains D of the long tube group 6 </ b> A reach the back surface of the workpiece W to form a through hole H. As a result, the grinding fluid G0 or the grinding gas, the grinding gas, and the coolant are blown out, and the cylindrical residue G1 falls off, so that efficient drilling is performed in a short time.

Each cylindrical grinding wheel (2, 5), 6, 8 and the cup cylinder grinding wheel 5 shown in FIG. This will be described with reference to FIG.
First, in the structure of the long and short pipes of the grinding wheels 6 and 8, A is a pressurized coolant (gas, liquid), which is supplied from an introduction path to a plurality of pipes arranged in a cylindrical shape. In B, a plurality of pipes are ejected to the machining point C while being self-cooled with coolant (grinding fluid G0 or grinding gas and coolant fluid C0). At the processing point C, the coolant cools while collecting chips and dust. In D, the coolant is pushed out from the discharge pipes of the short pipes 6B, 8A and 8S together with the chips and dust and discharged to the outside.
Further, in the cylindrical grinding wheel 2 (cup cylindrical grinding wheel 5) provided with a plurality of longitudinal grooves in the axial direction on the inner peripheral surface and outer peripheral surface, A is a pressurized coolant (gas, liquid). In B, the coolant is press-fitted into the plurality of inner grooves 3B and 3C other than the cylindrical body 3 and the cup cylinder 5. In B, the coolant is jetted to the processing point C while the coolant self-cools the plurality of vertical grooves. At the processing point C, the coolant cools while taking up chips and dust. In D, the coolant is pushed out together with chips and dust from the grooves 3G and 3H of the outer peripheral surface 3F for discharge and discharged to the outside.

  Finally, a method for manufacturing the cylindrical grinding wheel 2 and the cup cylindrical grinding wheel 5 according to the first embodiment will be described with reference to FIG. The material is an aluminum pipe with an outer diameter of φ44 mm and an inner diameter of φ23 mm. In the first step, the end face and outer diameter are cut with a cutting tool. In the second step, internal cutting with a cutting tool. In the third step, outer diameter grooving with a rotary cutter and notch of the tip surface. In the fourth step, a hole is formed (a groove is formed in the fifth step). In the fifth step, the hole is cut out into a groove by cutting the inner diameter with a cutting tool. In the sixth step, the cylindrical body 3 is cut off to a predetermined length.

  As described above, according to the cylindrical grinding wheels 2 (cup cylindrical grinding wheels 5), 6, and 8 of the present invention, the following effects are obtained. First, in the drilling of holes from a thin plate to a thick plate, it is possible to improve the grinding efficiency by increasing the efficiency of the coolant liquid and grinding gas to the machining point / grinding point, increasing the efficiency of discharging grinding scraps, and shortening the grinding time.

In the drilling of the hole of the thick plate by the cylindrical grinding wheel 2 and the cup cylindrical grinding wheel 5 and others, the minimum grinding waste generation and the discharge efficiency of the grinding waste are increased, and the grinding gas and the coolant liquid are passed through the grinding wheel. By efficiently ejecting to the cutting edge and improving the grinding efficiency, the processing efficiency can be increased and the grinding time can be shortened.
In addition to drilling holes in a general metal plate or concrete, when the direction perpendicular to the linear direction of the carbon fiber yarn is used for cutting CFRP having a low strength, the machining can be dramatically improved. In other words, not only the conventional rotational processing that forcibly pulls the CFRP fiber in the direction of maximum strength but also the synergistic effect of “slashing” in the direction of cutting progress, delamination and delamination are said to be the fatal theme of CFRP. Can be significantly improved.

Furthermore, it is possible to rationally collect the dust that becomes cutting scraps and grinding scraps and to protect the environment.
That is, there is no peeling of the abrasive grains during grinding, and the grinding liquid can penetrate (wet) the surface of the cutting edge abrasive grains from the inside of the cutting edge. That is, when drilling a deep hole, the grinding liquid can reliably reach the cutting edge. Therefore, the grinding wheel edge (abrasive grain) always fills the grinding fluid, grinding gas, and internal holes from the internal small holes, the cutting edge cooling effect, the grinding dust discharge effect, the grinding resistance reduction effect, the heat generation reduction effect, the grinding efficiency improvement effect, etc. Can be expected greatly.

  This invention is good also as an embodiment which has arrange | positioned the dust collection cover and suction device which collect dust in the embodiment of each said grinding grindstone 2,5,6,8. Further, the object may be applied to carbon fiber reinforced plastic processing using a trepan cutter or a cup grindstone. Furthermore, the drive source attached to the chopping tool holder may be obtained from the pulsating compressed air supplied from the compressed air supply source (air compressor) in addition to the grinding fluid GO or coolant liquid CO to be pulsated and compressed. In this case, the grinding wheel or cutting tool is cooled by compressed air. Furthermore, the present invention can also be implemented as an embodiment of a chopping control device attached to a chopping tool holder used in a machine tool grinder or milling machine (milling machine or other processing machine).

DESCRIPTION OF SYMBOLS 1 Large diameter fitting hole seat board 1a Hole 2, 6, 8 Cylindrical body grinding grindstone 3 Cylindrical body 3A Inner peripheral surface 3F Outer peripheral surface 3B, 3C, 3G, 3H Groove 3I Peripheral part 3S Front end surface 4 Arbor 4A Center hole 4a Large Diameter fitting hole 4b Mounting screw 5 Cup cylinder grinding wheel 5a Closing plate 5B, 5C, 5G, 5H Groove 5S Tip face 5E Notch part 5F Outer peripheral face 5I Peripheral part 6A Long pipe 6B Short pipe 8A, 8B Cylindrical body 8X Double Cylindrical body 8L Long tube 8S Short tube 8C, 8D Opening 8M Tip hole B Bolt Ba Tip screw Bb Center hole CO Coolant fluid G Abrasive fluid GO Grinding fluid, grinding gas P Partition h Through hole h1 Center hole O Axial direction S Space W Work

Claims (2)

A double cylinder in which a large diameter cylinder and a small diameter cylinder having different inner diameters, outer diameters and cylinder lengths are fitted to each other is formed between two inner and outer walls formed by a thin plate material composed of two sheets. Each of which has an annular space, and a large-diameter cylinder is integrally fitted to the outer peripheral wall surface of the small-diameter cylinder, and abrasive grains are fixed to the tip of each cylinder. In each annular space, there is a configuration of a long tube of a small diameter cylinder and a short tube of a large diameter cylinder in which a plurality of partition walls are provided at equal intervals over the entire circumference of the circle in the axial direction of the cylinder, A through hole is formed between each partition wall of the tube and the short tube, and has an opening provided at the front end and the rear end of each through hole of the long tube and the short tube. cylinder grinding wheel, characterized in that anda arbor having a contact hole and a center hole to flow the grinding fluid or coolant to the respective openings of the rear end of the long tube holds the. A cylindrical body in which a plurality of pipes having through-holes are bundled into a cylindrical shape to form a pipe body group, and a grinding liquid or a coolant liquid is supplied to the tip machining point in the cylindrical body. A discharge short pipe provided with one or several pipes which are fixed to each other and which has a short tip and a rear end with a gap between the long pipes, and a rear end inner side of the cylindrical body. A cylindrical grinding wheel, comprising: a center hole connected to each through hole that opens to the rear end side of each long pipe; and an arbor into which a grinding liquid or a coolant liquid flows from each through hole.