JP5395572B2 - Grinding equipment - Google Patents

Description

  The present invention relates to a grinding apparatus, and more particularly to a grinding apparatus that rotates a metal bond grindstone to grind a workpiece and electrolytically dresses the metal bond grindstone.

  For example, there is an electrolytic in-process dressing grinding method (hereinafter referred to as “ELID grinding method”) as a grinding method that enables mirror surface grinding for ultra-precise grinding of iron-based materials. This ELID grinding method uses a metal bond grindstone in which fine abrasive grains are bonded by a conductive bond material such as cast iron, and electrolytically dresses the metal bond grindstone during grinding. Electrodes for electrolytic dressing are placed opposite to each other with a slight gap on the grinding surface, and a conductive grinding fluid such as aqueous coolant is supplied between the metal bond grindstone and the electrode while energizing between the metal bond grindstone and the electrode. Then, electrolytic dressing is performed to remove only the bonding material on the surface of the grindstone and expose the cutting edges of the abrasive grains.

  As an example of this ELID grinding method, an outline of a grinding apparatus disclosed in Patent Document 1 will be described with reference to FIG. The grinding apparatus 101 includes a metal bond grindstone 103 fixed to the tip of the rotating shaft 102, and electrode plates 104, 105 disposed to face the end surface 103a and the outer peripheral surface 103b of the metal bond grindstone 103 with a slight gap therebetween. A brush 106 that is in sliding contact with the outer peripheral surface 103 c of the main body of the metal bond grindstone 103, and a grinding fluid such as an aqueous coolant having electrical conductivity is supplied between the end surface 103 a and the outer peripheral surface 103 b of the metal bond grindstone 103 and the electrode plates 104 and 105. The nozzle 107 and the positive electrode are connected to the brush 106, and the negative electrode is connected to the electrode plates 104 and 105, and a grinding liquid is supplied between the end surface 103 a and the outer peripheral surface 103 b of the metal bond grindstone 103 and the electrode plates 104 and 105. A power supply 108 is provided to energize through the power supply.

  On the other hand, the work W is fixed to the support means 110, and the end surface 103 a is pressed against the work W while the metal bond grindstone 103 is rotated by the rotating shaft 102. , 105 is supplied with a grinding fluid and energized by a power source 108. Although the metal bond grindstone 103 is clogged and worn as the workpiece W is ground, it is electrolytically dressed by the grinding liquid and the electrode plates 104 and 105. Thereby, the workpiece W can be continuously ground.

Japanese Patent Laid-Open No. 10-76448

According to the grinding apparatus described in Patent Document 1, the metal bond grindstone 103 is electrolytically dressed during grinding, and the workpiece W can be continuously ground. In other words, the grinding liquid exists between the electrode plates 104 and 105 and the metal bond grindstone 103 during the grinding of the workpiece W, and the electrode plates 104 and 105 are energized between the electrode plates 104 and 105 and the metal bond grindstone 103. The metal bond grindstone 103 becomes the anode and electrolysis is performed. That is, the electrode plates 104 and 105 serving as the cathode undergo metal deposition and reduction reaction, the metal bonding grindstone 103 serving as the anode undergoes dissolution and oxidation reaction of the metal, and OH ⁻ ions are metal from the electrodes 104 and 105 side in the grinding liquid. It moves to the bond grindstone 103 side and carries an electric current. Here, the workpiece W is electrically connected to the brush 106 via the metal bond grindstone 103, the rotating shaft 102, the support means 110, etc., and the workpiece W also becomes an anode, and the grinding fluid charged with OH ⁻ ions is scattered. If the workpiece W adheres to the workpiece W, corrosion or rusting of the workpiece W is induced, and there is a concern that the quality of the workpiece W that has been ground is degraded.

  Therefore, the objective of this invention made | formed in view of this point is providing the grinding-work apparatus which can ensure the high quality grinding process by which the corrosion and rusting of the workpiece | work were suppressed.

  The grinding device according to the first aspect of the present invention for solving the above problem is a grinding device for grinding a workpiece by rotating a cylindrical metal bond grindstone in which abrasive grains are bonded by a conductive bond material. A grinding fluid supply means for supplying a grinding fluid, an electrode for electrolytic dressing that faces the ground surface of the metal bond grindstone with an interval for interposing the grinding fluid, the metal bond grindstone, and the electrode for electrolytic dressing A power supply for energizing the metal bond grindstone and the electrode for electrolytic dressing with a grinding liquid interposed between the electrodes and energizing the metal bond grindstone rotating in the presence of the grind liquid and the electrode for electrolytic dressing Then, in the grinding apparatus for electrolytic dressing the metal bond grindstone, the electrode surface of the metal bond grindstone and the electrode for electrolytic dressing faces each other. Characterized by comprising the electrolytic corrosion prevention member in the rotation direction downstream end of the metal bonded grinding wheel in the dressing area.

According to this, OH ⁻ ions dissolved in the grinding liquid generated along with the electrolytic dressing of the metal bond grindstone that is energized between the metal bond grindstone and the electrode for electrolytic dressing in the presence of the grinding liquid are electrolytically dressed by the electrolytic corrosion prevention member. Is sufficiently retained and retained between the electrode surface of the electrode for electrolytic dressing and the outer peripheral surface of the metal bond grindstone facing each other, thereby being scattered by the rotating metal bond grindstone. Corrosion or rusting of the workpiece due to adhesion of the grinding fluid is suppressed, and high-quality workpiece cutting can be ensured.

  A grinding apparatus according to a second aspect of the present invention is a grinding apparatus that rotates a cylindrical metal bond grindstone in which abrasive grains are bonded by a conductive bond material, and grinds a workpiece, and supplies a grinding liquid. Grinding fluid supply means, an electrode holder having an electrode housing portion opened at the tip, and an electrode surface housed in the electrode housing portion of the electrode holder and exposed from the opening is ground with the grinding surface of the metal bond grindstone and the grinding Electrode dressing electrode with electrode surfaces facing each other with a liquid intervening space, and the metal bond grindstone and the electrolytic dressing electrode with the grinding fluid interposed between the metal bond grindstone and the electrolytic dressing electrode The metal bond grindstone that rotates in the presence of the grinding fluid and the electrode for electrolytic dressing to energize the metal bond grindstone. In the grinding apparatus for performing the sashing, a conductive electrolytic corrosion prevention member is provided on the downstream end side in the rotation direction of the metal bonding grindstone in the electrolytic dressing region where the electrode surface of the electrode for electrolytic dressing faces the metal bond grindstone at the tip of the electrode holder. It is characterized by that.

According to this, OH ⁻ ions dissolved in the grinding fluid generated along with the electrolytic dressing of the metal bond grindstone that is energized between the metal bond grindstone and the electrode for electrolytic dressing in the presence of the grinding fluid, the metal bond at the tip of the electrode holder Electrode dressing electrodes facing each other with the electrolytic dressing prevention member provided at the downstream end in the metal bond grinding wheel rotation direction of the electrolytic dressing region facing the electrode surface of the grinding stone and the electrode for electrolytic dressing facing each other. Grinding fluid is sufficiently retained and retained between the surface and the outer peripheral surface of the metal bond grindstone, which suppresses corrosion or rusting of the workpiece caused by adhesion of the grinding fluid that is spun and scattered by the rotating metal bond grindstone As a result, high-quality workpiece cutting can be ensured.

  A grinding apparatus according to a third aspect of the present invention is a grinding apparatus that rotates a cylindrical metal bond grindstone in which abrasive grains are bonded by a conductive bond material, and grinds a workpiece, and supplies a grinding liquid. Grinding fluid supply means, an electrode holder having an electrode housing portion opened at the tip, and an electrode surface housed in the electrode housing portion of the electrode holder and exposed from the opening is ground with the grinding surface of the metal bond grindstone and the grinding Electrode dressing electrode with electrode surfaces facing each other with a liquid intervening space, and the metal bond grindstone and the electrolytic dressing electrode with the grinding fluid interposed between the metal bond grindstone and the electrolytic dressing electrode The metal bond grindstone that rotates in the presence of the grinding fluid and the electrode for electrolytic dressing to energize the metal bond grindstone. In the grinding apparatus for performing a sshing, the electrode holder tip is provided with a conductive electrolytic corrosion prevention member that opens along an electrolytic dressing region where the electrode surfaces of the metal bond grindstone and the electrode for electrolytic dressing face each other. And

According to this, OH ⁻ ions dissolved in the grinding fluid generated along with the electrolytic dressing of the metal bond grindstone that is energized between the metal bond grindstone and the electrode for electrolytic dressing in the presence of the grinding fluid, the metal bond at the tip of the electrode holder Release from the electrolytic dressing region is suppressed by the electrolytic corrosion prevention member disposed along the electrolytic dressing region where the electrode surface of the grinding stone and the electrode for electrolytic dressing opposes, and the electrode surface of the electrode for electrolytic dressing and the metal bond grindstone facing each other The grinding fluid is sufficiently retained and retained between the outer peripheral surface of the workpiece and this prevents the workpiece from corroding or rusting due to the adhesion of the grinding fluid that is rotated and scattered by the rotating metal bond grindstone. Work cutting can be secured.

  According to a fourth aspect of the present invention, in the grinding apparatus according to any one of the first to third aspects, the electrolytic corrosion preventing member is a conductive material, and a positive voltage is applied to the electrolytic corrosion preventing member. It is characterized by applying.

According to this, OH ⁻ ions dissolved in the grinding fluid generated along with the electrolytic dressing are guided to the electrolytic corrosion prevention member serving as the anode, and the OH ⁻ ions are removed from the grinding fluid, and are rotated along with the rotating metal bond grindstone. Corrosion or rusting of the workpiece due to adhesion of the grinding fluid that is scattered is suppressed.

  According to this invention, the grinding liquid generated along with the electrolytic dressing of the metal bond grindstone that is energized between the metal bond grindstone and the electrode for electrolytic dressing in the presence of the grinding liquid is applied to the electrode surface of the electrode for electrolytic dressing by the electrolytic corrosion prevention member. High-quality workpieces with reduced corrosion and rusting of workpieces caused by adhesion of grinding fluid that is retained and retained by the rotating metal bond grindstone and scattered by the rotating metal bond grindstone. Cutting can be secured.

It is a figure which shows the outline | summary of the grinding processing apparatus which concerns on 1st Embodiment. It is the A section enlarged view of FIG. FIG. 3 is a view taken in the direction of arrow B in FIG. (A) is the II sectional view taken on the line of FIG. 2, (b) is the II-II sectional view of FIG. 2, (c) is the III-III sectional view of FIG. It is a figure which shows the outline | summary of the grinding-work apparatus which concerns on 2nd Embodiment. It is the C section enlarged view of FIG. It is a D arrow line view of FIG. It is explanatory drawing of the conventional grinding processing apparatus.

(First embodiment)
The first embodiment according to the present invention will be described with reference to FIGS. 1 to 4 by taking as an example the case of grinding the outer peripheral surface of a shaft-shaped workpiece W. FIG. FIG. 1 is a diagram showing an outline of a grinding apparatus, FIG. 2 is an enlarged view of a portion A in FIG. 1, and FIG. 3 is a view taken in the direction of arrow B in FIG. In order to clarify the configuration of the grinding apparatus, the side panel is shown in phantom lines in FIGS. 1 and 2, and the metal bond grindstone is shown in phantom lines in FIG. An arrow R indicates the rotation direction of the metal bond grindstone.

  The grinding apparatus 1 includes a metal bond grindstone 3 that is rotationally driven by a rotating shaft 2 supported by an apparatus main body such as a frame (not shown), a base part 5 supported by the apparatus main body, and an electrode holder that is attached to and supported by the base part 5. 10. Electrode dressing electrode 21 slidably housed and held in electrode holder 10, electrode position adjusting unit 30, and work holding mechanism (not shown) for holding work W rotatably, electrode holder 10 for electrolytic dressing The rotating shaft 2 and the workpiece W for rotating the electrode 21, the metal bond grindstone 3 are arranged coaxially. For the sake of explanation, this axis is referred to as a reference line L.

  The metal bond grindstone 3 fixed to the rotating shaft 2 is made of a conductive bond material made of bronze or cast iron with fine abrasive grains such as diamond, CBN (cubic boron nitride), crystalline aluminum oxide and silicon carbide. It is configured to be joined and formed into a columnar shape having end faces 3a and 3b and an outer peripheral surface 3c to be a grinding surface.

  The base portion 5 includes a flat base portion 6 supported by the apparatus main body and a flange portion 7 continuously formed in an arc shape along the periphery of the base portion 6, and a rod penetrating through the flange portion 7 in parallel with the reference line L. Hole 7b, grinding fluid supply pipe insertion holes 7c and 7d, and electric wire hole 7e are formed.

  The electrode holder 10 includes an electrode holder main body 11 and a side panel 19 formed of an insulating member. The electrode holder main body 11 includes a bottom portion 12 having a rectangular bottom surface 12a extending along the base portion 6 of the base portion 5, a top portion 13 extending in parallel with the reference line L along the upper edge of the bottom portion 12, and a bottom portion. A lower portion 14 extending in parallel with the reference line L along the lower edge of the bottom portion 12, and a rear surface 15 a extending along the rear edge of the bottom portion 12 and facing the flange portion 7. And the rear portion 15 are integrally formed, and the top surface 16 is formed in a planar shape that is continuous in a U-shape. The tip portion 17 of the electrode holder body 11 is formed by an upper portion 13 and a lower portion 14 and has a rectangular flat upper tip surface portion 17a and a lower tip surface portion 17b which are orthogonal to the reference line L, and a concave portion formed on the bottom portion 12 to form an upper portion. It is formed by a first side tip surface 17C that connects the tip surface portion 17a and the lower tip surface portion 17b.

  Furthermore, a rectangular tube is formed together with a second side guide surface 18e of a side panel 19 to be described later by opening in a U-shape at the distal end portion 17 of the electrode holder main body 11 and opening in a rectangular shape at the top portion 16 continuously in the reference line L direction. A concave portion constituting the electrode housing portion 18 is formed.

  The concave portion is continuous with the edge 17Ca of the first side tip surface 17C and is continuous with the first side guide surface 18a formed in a rectangular flat shape on the bottom 12 and the edge 17Ca of the upper tip surface portion 17a. A rectangular planar upper guide surface 18b formed along the upper edge of the side guide surface 18a, and an end edge 17Ba of the lower tip surface portion 17b are formed along the lower edge of the first side guide surface 18a. A rectangular planar lower surface guide surface 18c is formed in a U-shaped cross section continuous in the reference line L direction, and the rear ends of the first side guide surface 18a, the upper guide surface 18b, and the lower guide surface 18c are rear guide surfaces. Connected by 18d.

  A rod through-hole 15b communicating with the rear surface 15a and the rear guide surface 18d corresponding to the rod through-hole 7b opening to the flange portion 7 of the base portion 2, the grinding fluid supply tube insertion holes 7c and 7d, and the wire hole 7e. The grinding fluid supply pipe insertion holes 15c and 15d and the electric wire hole 15e are formed.

  On the other hand, the side panel 19 is formed in a flat plate shape that covers the top surface 16 of the electrode support body 11 and is formed with a second side guide surface 18e that faces the first side guide surface 18a. The front end surface of the side panel 19 is formed in an upper end surface portion 19a, a lower end surface portion 19b, and a concave shape that can be respectively continuous with the upper end surface portion 17a and the lower end surface portion 17b of the electrode holder body 11, and the upper end surface portion 19a and the lower end surface It is formed by the second side end surface 17D that connects the surface portion 19b.

  The electrode holder main body 11 formed in this way has the base 6 of the base 5 with the bolt 11b in a state where the bottom 12a is in contact with the base 6 of the base 5 and the rear surface 15a is positioned facing the flange 7. Combined with A side panel 19 is superimposed on the top surface 16 of the electrode holder main body 11, and is joined by a bolt 19b.

  As a result, the upper tip surface 17A of the electrode holder body 11 and the upper tip surface portion 19a of the side panel 10 form an upper tip surface 17A continuous in a planar shape, and the lower tip surfaces 17b and 19b continue in a planar shape. 17B is formed.

  A rectangular cross-sectional shape extending along the reference line L direction by the first side guide surface 18a, the upper guide surface 18b, the lower guide surface 18c of the electrode holder body 11 and the second side guide surface 18e of the side panel 19 A rectangular opening is formed at the tip by the edge 17Aa of the upper tip surface 17A, the edge 17Ba of the bottom tip surface 17B, the edge 17Ca of the first side tip surface 17C, and the edge 17Da of the second side tip surface 17D. An electrode housing portion 18 having a rectangular cross section and continuing in the direction of the reference line L is formed.

  The electrode 21 for electrolytic dressing is made of, for example, iron having excellent conductivity, and includes a first side guide surface 18a, an upper guide surface 18b, a lower guide surface 18c, and a second guide surface 18a of the electrode housing portion 18 formed in the electrode holder 10. A rectangular opening having a first side surface 21a, an upper surface 21b, a lower surface 21c, and a second side surface 21e, which can be slidably contacted with the side guide surface 18e, and a rectangular opening penetrating the first side surface 21a and the second side surface 21e. The part 22 is divided into a rear end part 23 and a front end part 24.

  The rod end groove 23b and the grinding liquid supply pipe are inserted into the rear end 23 corresponding to the rod through groove 15b, the grinding liquid supply pipe insertion holes 15c and 15d, and the electric wire hole 15e formed in the rear part 15 of the electrode holder body 11. Holes 23c and 23d and a wire groove 23e are formed.

  An electrode surface 25 having an arcuate cross section is formed on the distal end surface of the distal end portion 24. The electrode surface 25 has a rectangular shape that is long in the vertical direction facing the outer peripheral surface 3c of the metal bond grindstone 3, and a gap that allows the grinding liquid to intervene between the outer peripheral surface 3c of the metal bond grindstone 3; It is formed in a cylindrical inner peripheral surface in which about 5 mm is formed.

  The front end portion 24 is formed with a grinding fluid passage 26 in which the grinding fluid supply ports 26 a and 26 b are opened corresponding to the grinding fluid supply pipe insertion holes 15 c and 15 d formed in the rear end portion 23. A plurality of discharge holes that are branched and opened in the electrode surface 25 are formed. In this embodiment, as shown in FIGS. 2 and 4 (a), (b), and (c), a cross section taken along line II, line II-II, and line III-III of FIG. 3 is a pair of openings that are separated from each other in the width direction above the downstream side in the rotational direction of the metal bond grindstone 3 adjacent to the discharge hole 27a. And a pair of discharge holes 27d and 27e that are opened away from both ends in the width direction of the electrode surface 25 at the center in the length direction of the electrode surface 25 on the downstream side in the rotation direction of the metal bond grindstone 3. The discharge holes 27a to 27e are distributed and opened over the entire width of the electrode surface 25.

  The electrode position adjusting unit 30 is attached to the apparatus main body and passes through the adjusting base 31 in which the rod through hole 31a is formed, the rod through groove 15b of the electrode holder main body 11 and the rod through hole 15b of the flange 7, and the tip 32a. The rod 32 is formed with a stepped portion and a threaded portion, and the threaded portion is formed at the base end 32b, and the base end portion 32b of the rod 32 passing through the rod through hole 31a of the adjusting base portion 31 is opposed to the rod 32 through the adjusting base portion 31. A pair of adjusting nuts 33a and 33b that are screwed together, a pair of flanged bushes 34a and nuts 34b that fit into a rod locking groove 23b formed at the tip 32a of the rod 32 and the rear end 23 of the electrode 21, etc. The fixing tool 34 which fixes to the rear-end part 23 with this fixing tool is provided. The electrode 23 is fixed by fixing the base end 32b of the rod 32 to the adjustment base 31 by a pair of adjustment nuts 33a and 33b threadedly engaged with the base end 32b of the rod 32, and the adjustment nuts 33a and 33b are loosened to loosen the rod 32. By moving in the axial direction, the electrode 32 moves in the electrode housing portion 18 between a forward position indicated by a solid line and a backward position indicated by a virtual line.

  Grinding fluid supply pipes 28a and 28b for supplying a grinding fluid from a grinding fluid supply source (not shown) are drilled in the grinding fluid supply pipe insertion holes 7c and 7d formed in the flange portion 7 of the base portion 5 and the electrode holder main body 11, respectively. The grinding fluid supply pipe insertion holes 15c, 15d and the grinding fluid supply pipe insertion holes 23bc, 23d drilled in the rear end portion 23 of the electrolytic dressing electrode 21 are movably penetrated to supply the grinding fluid supply ports 26a, 26b. A grinding fluid supply means for supplying the grinding fluid from the grinding fluid supply source to the electrolytic dressing region formed between the outer peripheral surface 3c of the metal bond grindstone 3 and the electrode surface 25 of the electrolytic dressing electrode 21 is formed. Is done. Here, the discharge holes 27a, the pair of discharge holes 27b and 27c that are opened apart from each other in the width direction on the downstream side in the rotation direction of the metal bond grindstone 3 adjacent to the discharge holes 27a, and the rotation of the metal bond grindstone 3 are further rotated. A pair of discharge holes 27d and 27e that are opened away from each other in the vicinity of both ends in the width direction of the electrode 25 at the center in the length direction of the electrode surface 25 on the downstream side in the direction, and the discharge holes 27a to 27e are substantially the full width of the electrode surface 25. It is distributed over the openings. Since the discharge holes 27 a to 27 e are dispersed and opened over the entire width of the electrode surface 25, the grinding liquid is uniformly ejected over the entire width of the outer peripheral surface 3 c serving as the grinding surface of the metal bond grindstone 3.

  Conductive and corrosion-resistant on the upper tip surface 17A of the electrode holder 10 located at the downstream end in the rotation direction of the metal bond grindstone 3 in the electrolytic dressing region where the electrode surface 25 of the electrode 21 for electrolytic dressing and the outer peripheral surface 3c of the metal bond grindstone 3 face each other. An electrolytic corrosion prevention plate 35 which is an electrolytic corrosion prevention member made of, for example, stainless steel having excellent properties is attached. The electrolytic corrosion prevention plate 35 is a plate having a rectangular plate shape with a mounting hole 35b formed by a long hole extending in the vertical direction, and is inserted into the mounting hole 35b and formed on the upper tip surface portion 18a of the electrode holder 10. The front end edge 35a is positioned and attached to a position approaching the end edge 17Aa of the upper front end face 17A and the outer peripheral face 3c of the metal bond grindstone 3 by a mounting bolt 36 screwed into the drilled screw hole. Further, by forming the end surface of the electric corrosion prevention plate 35 on the side of the metal bond grindstone 3 into an acute-angled bank shape, the grinding liquid scattered between the upper end surface 17A of the electrode holder 10 is temporarily retained and held. A space for this is formed. That is, the tip edge 35a is formed on the outer peripheral surface 3c of the metal bond grindstone 3 at the downstream end in the rotation direction of the metal bond grindstone 3 in the electrolytic dressing region where the electrode surface 25 of the electrode 21 for electrolytic dressing and the outer peripheral surface 3c of the metal bond grindstone 3 face each other. The electrolytic corrosion prevention plate 35 is attached to the upper tip surface 17A of the electrode holder 10 in the approached state.

  Further, the positive electrode is connected to the metal bond grindstone 3 through the apparatus main body and the rotating shaft 2, and the negative electrode is drilled in the wire hole 7 e formed in the flange portion 7 of the base portion 5 and the electrode support portion main body 11. The metal bond grindstone 3 is connected to the distal end portion 24 of the electrolytic dressing electrode 21 through the electric wire hole 15e provided and the electric wire 29 penetrating the electric wire groove 23de formed in the rear end portion 23 of the electrolytic dressing electrode 21. Between the outer peripheral surface 3c and the electrode surface 25 is provided with a power source for energizing through the grinding fluid. Further, the positive electrode of the power source is connected to the electric corrosion prevention plate 35 via the electric wire 39, and a positive voltage is applied to the electric corrosion prevention plate 35.

  The operation will be described below. In FIG. 1, before starting the grinding with the metal bond grindstone 3, the adjustment nuts 33a and 33b of the electrode position adjusting unit 30 are loosened and the rod 32 is moved in the axial direction to move the electrode 21 for electrolytic dressing, The electrode surface 25 of the dressing electrode 21 is opposed to the outer peripheral surface 3c of the metal bond grindstone 3 with a predetermined interval. Then, the adjustment nuts 33a and 33b are tightened to fix the rod 32, and the electrolytic dressing electrode 21 is fixed to the position.

  Next, the grinding fluid is supplied from the grinding fluid supply source to the grinding fluid path 26 of the electrode 21 for electrolytic dressing through the grinding fluid supply pipes 28a and 28b, and the electrode surface 25 and the metal bond are supplied from the discharge holes 27a to 27e. While supplying a grinding fluid between the outer peripheral surface 3c of the grindstone 3, a power supply is turned on. The current output from the power source flows through the apparatus main body, the rotating shaft 2, the metal bond grindstone 3, the grinding fluid, the electrode 21 for electrolytic dressing, the electric wire 29, and the path of the power source, and the electrolytic dressing is started. In this state, a positive voltage is applied to the electrolytic corrosion preventing plate 35 via the electric wire 39, and the electrolytic corrosion preventing plate 35 becomes an anode.

  In this state, the rotary shaft 2 is driven at a predetermined rotation speed, the metal bond grindstone 3 is rotated, and the workpiece W is rotated to start grinding. The outer peripheral surface 3c, which becomes the grinding surface of the metal bond grindstone 3 clogged with the grinding of the workpiece W, is electrolytically dressed by the grinding liquid interposed between the opposing outer peripheral surface 3c and the electrode surface 25, thereby causing clogging. It will be resolved. That is, the conductive grinding fluid exists between the electrode surface 25 of the electrode 21 for electrolytic dressing and the outer peripheral surface 3c of the metal bond grindstone 3 during the cutting of the workpiece W, and the electrode 21 and the metal bond grindstone 3 are energized. By doing so, the electrode 21 for electrolytic dressing becomes a cathode and the metal bond grindstone 3 becomes an anode, and the outer peripheral surface 3c of the metal bond grindstone 3 is electrolytic dressed.

  Here, the grinding liquid rotated around the outer peripheral surface 3c of the metal bond grindstone 3 that rotates with grinding is attached to the upper tip surface 17A of the electrode holder 10, and the tip edge 35a is the edge of the upper tip surface 17A. 17Aa and the grinding liquid released from the gap between the edge 17Aa of the upper tip surface 17A and the outer peripheral surface 3c of the metal bond grindstone 3 while being suppressed by the electrolytic corrosion prevention plate 35 approaching the outer peripheral surface 3c of the metal bond grindstone 3 Is sufficiently retained between the electrode surface 25 of the electrode 21 for electrolytic dressing and the outer peripheral surface 3c of the metal bond grindstone 3 which are opposed to each other, and the electrolytic dressing is uniform on the outer peripheral surface 3c of the metal bond grindstone 3 Is given.

  On the other hand, the grinding fluid rotated along the outer peripheral surface 3c of the metal bond grindstone 3 that rotates with grinding is attached to the upper tip surface 17A of the electrode holder 10, and the tip edge 35a is the edge 17Aa of the upper tip surface 17A. And the grinding fluid discharged from the gap between the edge 17Aa of the upper tip surface 17A and the outer peripheral surface 3c of the metal bond grindstone 3 is suppressed by the electrolytic corrosion prevention plate 35 approaching the outer peripheral surface 3c of the metal bond grindstone 3. The grinding liquid is sufficiently retained and held between the electrode surface 25 of the electrode 21 for electrolytic dressing and the outer peripheral surface 3c of the metal bond grindstone 3 which are opposed to each other.

  Corrosion or rusting of the workpiece W due to the adhesion of the grinding liquid that is rotated around the outer peripheral surface 3c of the metal bond grindstone 3 and scatters from the gap between the electrolytic corrosion prevention plate 35 and the outer peripheral surface 3c of the metal bond grindstone 3 is caused. It is suppressed.

An electrolytic corrosion prevention plate in which OH ⁻ ions dissolved in the grinding liquid that is rotated around the outer peripheral surface 3c of the metal bond grindstone 3 and released from the gap between the outer peripheral surface 3c of the metal bond grindstone 3 serve as an anode. High-quality workpieces that are induced and attracted to 35 and that remove or significantly reduce OH ⁻ ions from the grinding fluid and are scattered or adhered to the workpiece W to prevent corrosion or rusting of the workpiece W. Cutting can be secured. Further, corrosion or rusting of the processing apparatus main body due to the grinding fluid scattered and adhering to the processing apparatus main body is suppressed.

(Second Embodiment)
A second embodiment of a grinding apparatus according to the present invention will be described with reference to FIGS. FIG. 5 is a diagram showing an outline of the grinding apparatus, FIG. 6 is an enlarged view of a portion C in FIG. 5, and FIG. The present embodiment is different from the first embodiment in the specific configuration of the electrolytic corrosion prevention plate, and the other configurations are the same as those of the first embodiment. FIGS. 5 to 7 are the same as FIGS. The detailed description of this part is omitted by attaching the same reference numerals to the corresponding parts.

  The electrolytic corrosion prevention plate 50, which is an electrolytic corrosion prevention member in the present embodiment, is a rectangular plate having a rectangular opening formed of, for example, stainless steel that is conductive and excellent in corrosion resistance, and is an upper portion of the electrode holder 10. A rectangular upper portion 51 that extends along the distal end surface 17A so that the distal end edge 51a approaches the edge 17Aa of the upper distal end surface 17A and the outer peripheral surface 3c of the metal bond grindstone 3, and extends along the lower front surface 17B. The front edge 52a extends along the rectangular lower portion 52 that approaches the edge 17Ba of the lower front surface 17B and the outer peripheral surface 3c of the metal bond grindstone 3, and the front edge 53a extends along the first side front surface 17C. A rectangular first side portion 53, which is close to the edge 17 Ca of the first side tip surface 17 C and the end surface 3 a of the metal bond grindstone 3 and is laid on the upper portion 51 and the lower portion 52, and a second side tip surface To 17D A rectangular second side portion that extends so that the tip edge 54a approaches the end edge 17Da of the second side tip surface 17D and the end surface 3b of the metal bond grindstone 3 and is installed on the upper portion 51 and the lower portion 52. The portion 54 is integrally formed.

  That is, the electrolytic corrosion preventing plate 50 has a tip edge 51a at the downstream end in the rotation direction of the metal bonding grindstone 3 in the electrolytic dressing region where the electrode surface 25 of the electrode 21 for electrolytic dressing and the outer peripheral surface 3c of the metal bond grindstone 3 face each other. Electrode dressing electrode in which the upper portion 51 attached to the upper tip surface 17B of the electrode holder 10 and the electrode surface 25 of the electrode 21 and the outer peripheral surface 3c of the metal bond grindstone 3 face each other. The tip edge 52 a of the metal bond grindstone 3 at the upstream end in the rotation direction of the metal bond grindstone 3 at the upstream end in the rotation direction of the metal bond grindstone 3 in the electrolytic dressing region where the electrode surface 25 of the metal 21 and the outer peripheral surface 3 c of the metal bond grindstone 3 face each other. A lower portion 52 attached to the lower tip surface 18b of the electrode holder 10 in a state of approaching the outer peripheral surface 3c, Extending along the side tip surface 17C, the tip edge 53a protrudes from the edge 17Ca of the first side tip surface 17C and approaches the end surface 3a of the metal bond grindstone 3, and is installed on the upper portion 51 and the lower portion 52. The first side portion 53 of the rectangular shape and the end surface of the metal bond grindstone 3 extending along the second side tip surface 17D and the tip edge 54a projecting from the edge 17Da of the second side tip surface 17D. 3b, and the upper part 51 and the rectangular second side part 54 erected on the lower part 52 are integrally formed, and the respective leading edges 51a, 52a, 53a, 54a that form openings along the electrolytic dressing region Is extended.

  Further, attachment holes 51b and 52b formed by long holes in the vertical direction are formed in the upper part 51 and the lower part 52, respectively, and inserted into the attachment hole 51b and formed in the upper tip part 17A of the electrode holder 10. The mounting bolt 55 that is screwed into the screw hole and the mounting bolt 56 that is inserted into the mounting hole 52b and screwed into the screw hole formed in the lower tip portion 17B are attached to the upper tip portion 17A and the lower tip portion 17B of the electrode holder 10. It is attached. Similarly to the first embodiment, the positive electrode of the power source is connected to the electric corrosion prevention plate 50 via the electric wire 39, and a positive voltage is applied to the electric corrosion prevention plate 50 so that the electric corrosion prevention plate 50 is an anode. It becomes.

  According to this configuration, in addition to the first embodiment, each edge 17Aa, 17Ba of the upper tip surface 17A, the lower tip surface 17B, the first side tip surface 17C, and the second side tip surface 17D of the electrode holder 10 is provided. The electrolytic corrosion preventing plate 50 adjacent to the outer peripheral surface 3c and the end surfaces 3a, 3b of the metal bond grindstone 3 so that the tip edges 51a, 52a, 53a, 54a adjacent to 17Ca, 17Da surround the electrolytic dressing region from the electrolytic dressing region. The grinding liquid is sufficiently retained and held between the electrode surface 25 of the electrode 21 for electrolytic dressing and the outer peripheral surface 3c of the metal bond grindstone 3 that are opposed to each other, and the outer peripheral surface 3c of the metal bond grindstone 3 is suppressed. A uniform electrolytic dressing is applied.

  In addition, the grinding liquid discharged from the electrolytic dressing region is suppressed by the electrolytic corrosion prevention plate 50, and the grinding liquid is sufficiently between the electrode surface 25 of the electrode 21 for electrolytic dressing and the outer peripheral surface 3 c of the metal bond grindstone 3 facing each other. Corrosion or rusting of the workpiece W due to the grinding liquid that is retained and held and is rotated by the outer peripheral surface 3c of the metal bond grindstone 3 and scattered and adhered to the workpiece W is suppressed.

Further, the gap between the edge 17Aa of the upper tip surface 17A and the outer peripheral surface 3c of the metal bond grindstone 3 is rotated by the outer peripheral surface 3c of the metal bond grindstone 3, and the edge 17Ba of the lower tip surface 17B and the metal bond grindstone 3 The gap between the outer peripheral surface 3c, the gap between the edge 17Ca of the first side tip surface 17C and the end surface 3a of the metal bond grindstone 3, and the edge 17Da of the second side tip surface 17D and the end surface 3a of the metal bond grindstone 3 The OH ⁻ ions dissolved in the grinding liquid discharged from the gap are guided and attracted by the electrolytic corrosion prevention plate 50 serving as the anode, and the OH ⁻ ions are removed or greatly reduced from the grinding liquid and scattered on the workpiece W. Corrosion or rusting of the workpiece W caused by the adhering grinding fluid is suppressed, and high-quality workpiece cutting can be ensured.

  In addition, this invention is not limited to the said embodiment, A various change can be made in the range which does not deviate from the meaning of invention. For example, in each of the above embodiments, the electrolytic dressing is applied to the metal bond grindstone during the grinding of the workpiece W. However, the electrolytic dressing can be applied every preset number of times of grinding. Further, in each of the above embodiments, the electrolytic corrosion prevention plate 35 or 50 is connected to the positive electrode of the power supply via the electric wire 39, but the installation of the electric wire 39 can be simplified by connecting to the apparatus main body. In the first embodiment, the grinding fluid supply means supplies the grinding fluid between the electrode surface 25 and the metal bond grindstone 3 from the discharge holes 27a to 27e formed in the electrode 21 for electrolytic dressing. By providing and supplying a grinding liquid between the electrode surface 25 and the metal bond grindstone 3, the shape of the electrode for electrolytic dressing can be simplified.

DESCRIPTION OF SYMBOLS 1 Grinding machine 2 Rotating shaft 3 Metal bond grindstone 3c Outer peripheral surface (grinding surface)
DESCRIPTION OF SYMBOLS 10 Electrode holder 17 Tip part 18 Electrode accommodating part 21 Electrode dressing electrode 25 Electrode surface 26 Grinding fluid passages 27a to 27e Discharge holes 28a and 28b Grinding fluid supply pipe 29 Electric wire 35 Electric corrosion prevention plate (electric corrosion prevention member)
39 Electric wire 50 Electric corrosion prevention plate (electric corrosion prevention member)

Claims (4)

A grinding apparatus for grinding a workpiece by rotating a cylindrical metal bond grindstone in which abrasive grains are bonded by a conductive bond material, a grinding liquid supply means for supplying a grinding liquid, and a grinding surface of the metal bond grindstone And an electrode for electrolytic dressing facing each other with an interval for interposing a grinding fluid, and the metal bond grinding wheel and the electrolytic dressing with a grinding fluid interposed between the metal bond grinding wheel and the electrode for electrolytic dressing A power supply for energizing an electrode, and a grinding apparatus for electrolytically dressing the metal bond grindstone by energizing the electrode for electrolytic dressing and the metal bond grindstone rotating in the presence of the grinding fluid,
A grinding apparatus comprising a conductive electrolytic corrosion prevention member at a downstream end in a rotation direction of the metal bond grindstone in an electrolytic dressing region where the electrode surface of the electrode for electrolytic dressing faces the metal bond grindstone. A grinding apparatus for grinding a workpiece by rotating a cylindrical metal bond grindstone in which abrasive grains are bonded by a conductive bond material, and containing a grinding fluid supply means for supplying a grinding fluid and an electrode opening at a tip portion And the electrode surface that is accommodated in the electrode accommodating portion of the electrode holder and is exposed from the opening is opposed to the ground surface of the metal bond grindstone with an interval through which the grinding fluid is interposed. Electrolytic dressing electrode, and a power source for energizing the metal bond grindstone and the electrolytic dressing electrode with the grinding fluid interposed between the metal bond grindstone and the electrolytic dressing electrode, and the presence of the grinding fluid In a grinding apparatus for electrolytic dressing the metal bond grindstone by energizing the metal bond grindstone rotating below and the electrode for electrolytic dressing,
A conductive electrolytic corrosion preventing member is provided on the downstream end side in the rotation direction of the metal bond grindstone in the electrolytic dressing region where the electrode surface of the electrode for electrolytic dressing faces the metal bond grindstone at the tip of the electrode holder. Grinding equipment. A grinding apparatus for grinding a workpiece by rotating a cylindrical metal bond grindstone in which abrasive grains are bonded by a conductive bond material, and containing a grinding fluid supply means for supplying a grinding fluid and an electrode opening at a tip portion And the electrode surface that is accommodated in the electrode accommodating portion of the electrode holder and is exposed from the opening is opposed to the ground surface of the metal bond grindstone with an interval through which the grinding fluid is interposed. Electrolytic dressing electrode, and a power source for energizing the metal bond grindstone and the electrolytic dressing electrode with the grinding fluid interposed between the metal bond grindstone and the electrolytic dressing electrode, and the presence of the grinding fluid In a grinding apparatus for electrolytically dressing the metal bond grindstone by energizing the metal bond grindstone rotating below and the electrode for electrolytic dressing,
A grinding apparatus comprising a conductive electrolytic corrosion prevention member opened along an electrolytic dressing region where the electrode surface of the metal bond grindstone and the electrode for electrolytic dressing faces each other at the tip of the electrode holder.   The grinding apparatus according to any one of claims 1 to 3, wherein the electrolytic corrosion preventing member is a conductive material, and a positive voltage is applied to the electrolytic corrosion preventing member.

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