JP5449807B2 - 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 a grinding apparatus that rotates the metal bond grindstone to grind the workpiece and electrolytically dresses the metal bond grindstone, there is a grinding apparatus disclosed in Patent Document 1. The grinding apparatus disclosed in Patent Document 1 includes a metal bond grindstone fixed to a rotating shaft, an electrode for electrolytic dressing in which an electrode surface is disposed to face an outer peripheral surface of the metal bond grindstone with a slight gap, a metal bond grindstone, A power source for applying a voltage to the electrode for electrolytic dressing, and a gap between the opposing metal bond grindstone serving as the electrolytic dressing region and the electrode for electrolytic dressing from the grinding liquid discharge hole opened on the electrode surface of the electrode for electrolytic dressing has conductivity. Grinding fluid supply means for supplying the grinding fluid is provided.

  On the other hand, the workpiece is supported rotatably, the workpiece is ground by rotating the metal bond grindstone with the rotation shaft, and the electrolytic dressing electrode and the metal bond grindstone are fed from the grinding liquid discharge hole formed in the electrode for electrolytic dressing. The metal bond grindstone is electrolytically dressed by supplying electricity while supplying the grinding liquid to the gap.

  A conventional configuration example is schematically shown in which a grinding liquid is supplied to a gap between an outer peripheral surface of a metal bond grindstone facing the electrode surface of an electrode for electrolytic dressing and an electrode surface of the electrode for electrolytic dressing from a grinding liquid discharge hole formed in this type of electrolytic dressing electrode. This will be described with reference to FIG.

  A cylindrical metal bond grindstone 102 having an outer peripheral surface 102 a serving as a grinding surface is fixed to a rotating shaft 101 that is rotationally driven by a driving means, and an electrode 103 for electrolytic dressing is opposed to the outer peripheral surface 102 a of the metal bond grindstone 102. Arranged. The electrode 103 for electrolytic dressing has a rectangular cross-sectional block shape, and an electrode surface 103a having an arc-shaped cross section is formed at the tip. The electrode surface 103 a is a long rectangle extending along the circumferential direction of the metal bond grindstone 102 so as to face the outer peripheral surface 102 a of the metal bond grindstone 102, and between the outer peripheral surface 102 a of the metal bond grindstone 102, It is formed in a cylindrical inner peripheral surface that allows interposition.

  A grinding liquid discharge hole 104 is opened on the electrode surface 103 a facing the outer peripheral surface 102 a of the metal bond grindstone 102 in the center in the width direction on the upstream end side in the rotation direction of the metal bond grindstone 102.

  During the cutting process, the grinding liquid continuously supplied from the grinding liquid supply hole 104 to the gap between the electrode surface 103 a of the electrode 103 for electrolytic dressing and the outer peripheral surface 102 a of the metal bond grinding wheel 102 while rotating the metal bond grinding stone 102. Fills the gap between the electrode surface 103a of the electrolytic dressing electrode 103, which becomes the electrolytic dressing region, and the outer peripheral surface 102a of the metal bond grindstone 102, and a voltage is applied to the electrode 103 for electrolytic dressing and the metal bond grindstone 102 to perform electrolysis. The outer peripheral surface 102a of the metal bond grindstone 102 is evenly electrolytic dressed.

Japanese Patent Laid-Open No. 10-113865

  During the cutting process, the grinding fluid is continuously supplied from the grinding fluid supply hole 104 to the electrode surface 103a of the electrode 103 for electrolytic dressing and the outer peripheral surface 102a of the metal bonding grinding stone 102 and the gap while rotating the metal bond grinding stone 102. Grinding fluid is held between the electrode surface 103a of the electrode 103 for electrolytic dressing and the outer peripheral surface 102a of the metal bond grindstone 102, and a voltage is applied to the electrode 103 for electrolytic dressing and the metal bond grindstone 102 so that the entire width of the electrode surface 103a is maintained. Thus, the electrolytic ability is maintained and the outer peripheral surface 102a of the electrolytic metal bond grindstone 102 is evenly electrolytic dressed.

  On the other hand, particularly in grinding processing for ultra-precise grinding of metal materials such as iron materials, it is required to increase the rotation speed of the metal bond grindstone 102 in order to improve the grinding quality and work efficiency. When the rotation speed of the metal bond grindstone 102 is increased, for example, when the peripheral speed of the metal bond grindstone 102 is 30 m or more per second, the amount of grinding liquid that accompanies the rotating metal bond grindstone 102 increases, and the electrode surface of the electrode 103 for electrolytic dressing 103a and the grinding liquid interposed in the gap between the outer peripheral surface 102a of the metal bond grindstone 102 are excessively discharged from the downstream end side in the rotation direction of the metal bond grindstone 102, and the gap between the electrode 103 for electrolytic dressing and the metal bond grindstone 102 facing each other. The grinding fluid intervening in the metal is reduced, and in particular, the grinding fluid in the range on both sides of the outer peripheral surface 102a of the metal bond grindstone 102 is diluted. As a result, the electrolysis capability is reduced in the range on both sides of the metal bond grindstone 102, and the electrolytic dressing on the outer peripheral surface 102a of the metal bond grindstone 102 varies, resulting in non-uniform grinding of the workpiece and grinding quality such as reduced machining accuracy. It is feared that this will lead to a decline.

This electrolytic dressing state will be described with reference to an action state explanatory diagram shown in FIG. In FIG. 13 (a) shows an outline of the electrode surface 103a of the electrolytic dressing electrode 103, (b) shows the existence range of the grinding liquid at the electrode surface 103a by hatching, (c) the outer circumferential surface 102a of the metal bond grindstone 102 The electrolytic dressing range is indicated by hatching.

  That is, it is supplied to the gap between the outer peripheral surface 102a of the opposing metal bond grindstone 102 and the electrode surface 103a of the electrode 103 for electrolytic dressing, which is an electrolytic dressing region, from the grinding liquid supply hole 104 opened in the center in the width direction of the electrode surface 103a. The grinding fluid is rotated by the outer peripheral surface 102a of the metal bond grindstone 102 rotating at a high speed and is discharged from the gap between the electrode surface 103a and the outer peripheral surface 102a of the metal bond grindstone 102. Along with this discharge, the grinding liquid ejected from the grinding liquid discharge hole 104 toward the central region in the width direction of the outer peripheral surface 102a of the metal bond grindstone 102 is rotated by the outer peripheral surface 102a of the metal bond grindstone 102 without diffusing. And is discharged from the gap between the electrode surface 103 a and the outer peripheral surface 102 a of the metal bond grindstone 102. As a result, as shown by hatching in (b), the grinding liquid becomes dilute in both sides of the electrode surface 103a excluding the central portion in the width direction, and the outer peripheral surface 102a of the metal bond grindstone 102 facing the both sides of the electrode surface 103a. The electrolysis capacity is greatly reduced in the both side area 102b. The electrolytic ability in the both side region 102b of the outer peripheral surface 102a of the metal bond grindstone 102 is reduced, and as shown by hatching in (c), the electrolytic dressing becomes insufficient in the both side region 102b of the outer peripheral surface 102a of the metal bond grindstone 102. There is variation in the electrolytic dressing on the outer peripheral surface 102a of the bond grindstone 102, and workpiece grinding becomes non-uniform, leading to a reduction in grinding quality such as a reduction in processing accuracy, and an increase in processing time.

  Accordingly, an object of the present invention made in view of such a point is to ensure that the outer peripheral surface of the metal bond grindstone is evenly electrolytic dressed over the entire width regardless of the rotation speed of the metal bond grindstone, and the workpiece machining accuracy and stable grinding quality are ensured. An object of the present invention is to provide a grinding apparatus that can perform such processing.

The grinding apparatus according to the first aspect of the present invention that solves the above-described problem includes a metal bond grindstone in which abrasive grains that rotate and grind a workpiece by an outer peripheral surface are coupled by a conductive bond material, and the metal bond grindstone Electrode dressing electrode facing the electrode surface with a gap interposing the grinding liquid between the outer peripheral surface, and the metal bond grindstone and the electrode for electrolytic dressing with the grinding liquid interposed between the metal bond grindstone and the electrode for electrolytic dressing A metal bonding grindstone that rotates in the presence of a grinding fluid and an electrolytic dressing electrode that performs electrolytic dressing on the metal bond grindstone, and the electrode for electrolytic dressing is disposed on the electrode surface. The grinding liquid that is opened and supplied from the grinding liquid supply means is sprayed so as to hit directly over the entire width of the outer peripheral surface of the metal bond grindstone. Comprising a plurality of grinding fluid discharge holes distributed and open in the width direction of the electrode surface in order to supply the grinding liquid in a gap between the outer peripheral surface and the electrode surface of the electrolytic dressing electrode of metal bond grindstone for serial facing, said plurality The grinding liquid discharge hole includes a first grinding liquid discharge hole disposed at a center portion in the width direction of the electrode surface, an opening portion of the first grinding liquid discharge hole in the width direction of the electrode surface, and respective openings. A pair of second grinding fluid discharge holes disposed at a position where a part of the second grinding fluid discharge hole overlaps, and a position where a part of the opening of the second grinding fluid discharge hole overlaps in the width direction of the electrode surface. And a pair of third grinding fluid discharge holes .

According to the present invention, a plurality of grinding fluids including a first grinding fluid ejection hole, a second grinding fluid ejection hole, and a third grinding fluid ejection hole whose openings overlap the electrode surface of the electrode for electrolytic dressing in the width direction of the electrode surface. Grinding liquid is sprayed from the blowout hole so that it strikes the entire circumference of the metal bond grindstone over the entire width, and the grinding liquid is supplied to the gap between the electrode surface of the electrode for electrolytic dressing and the outer circumference of the metal bond grindstone facing each other. Therefore, even if the accompanying rotation of the grinding fluid increases with an increase in the rotation speed of the metal bond grindstone, the grinding fluid is also present in the side area between the electrode surface of the electrode for electrolytic dressing and the outer peripheral surface of the metal bond grindstone. It is held and a uniform electrolytic dressing is applied to the outer peripheral surface of the metal bond grindstone. Thereby, the processing accuracy of the workpiece and stable grinding quality can be ensured.

  According to this invention, the electrode surface of the electrode for electrolytic dressing that is opposed by jetting the grinding liquid so as to directly hit the outer peripheral surface of the metal bond grindstone over the entire width from the grinding liquid discharge hole that opens to the electrode surface of the electrode for electrolytic dressing Between the electrode surface of the electrode for electrolytic dressing and the outer peripheral surface of the metal bond grindstone that always face each other regardless of the increase in the rotation speed of the metal bond grindstone by supplying the grinding liquid to the gap between the outer surface of the metal bond grindstone and the metal bond grindstone The grinding fluid is held over the entire width of the metal and a uniform electrolytic dressing is applied to the outer peripheral surface of the metal bond grindstone. Thereby, the processing accuracy of the workpiece and stable grinding quality can be ensured.

Is a diagram showing an outline of grinding unit according to the implementation. It is A arrow directional view of FIG. It is a perspective view which shows a grinding processing apparatus typically. It is explanatory drawing of the electrode for electrolytic dressing, (a) is a side view of the electrode for electrolytic dressing, (b) is a B arrow view of (a), (c) is the II sectional view taken on the line of (a), (D) is the II-II sectional view taken on the line of (a), (e) is the III-III sectional view taken on the line of (a). It is operation | movement explanatory drawing of an electrolytic dressing. It is a perspective view which shows typically the grinding processing apparatus which concerns on a 1st reference example . It is explanatory drawing of the electrode for electrolytic dressing, (a) is a side view of the electrode for electrolytic dressing, (b) is a C arrow view of (a), (c) is the IV-IV sectional view taken on the line of (a). is there. It is operation | movement explanatory drawing of an electrolytic dressing. It is a perspective view which shows typically the grinding-work apparatus which concerns on a 2nd reference example . It is explanatory drawing of the electrode for electrolytic dressing, (a) is a side view of the electrode for electrolytic dressing, (b) is the C arrow view of (a), (c) is the VV sectional view taken on the line of (a), (D) is the VI-VI sectional view taken on the line (a). It is operation | movement explanatory drawing of an electrolytic dressing. It is explanatory drawing of the conventional grinding processing apparatus. It is operation | movement explanatory drawing of the electrolytic dressing in the conventional grinding processing apparatus.

(In the form of implementation)
The case of grinding the outer peripheral surface of the implementation forms a shaft-like workpiece W according to the present invention will be described with reference to FIGS examples. FIG. 1 is a diagram showing an outline of a grinding apparatus, FIG. 2 is a view taken along arrow A in FIG. 1, FIG. 3 is a diagram schematically showing the operation of the grinding apparatus, and FIG. 4 is an explanatory view of an electrode for electrolytic dressing. . In order to clarify the configuration of the grinding apparatus, the side panel is shown in phantom lines in FIG. 1, 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 20 slidably housed and held in electrode holder 10, electrode position adjusting section 30, and work holding shaft (not shown) for holding work W rotatably, electrode holder 10 for electrolytic dressing The rotating shaft 2 and the workpiece W for rotationally driving the grindstone 20, the metal bond grindstone 3 are arranged on the coaxial line. For convenience of explanation, this axis is referred to as a reference line Z.

  The metal bond grindstone 3 fixed to the rotating shaft 2 is made of, for example, a conductive bond material made of fine abrasive grains such as diamond, CBN (cubic boron nitride), crystalline aluminum oxide, silicon carbide or the like made of bronze or cast iron. And is formed in a cylindrical shape having end faces 3a and 3b and an outer peripheral surface 4 serving as 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 Z. Hole 7b, grinding fluid supply pipe insertion holes 7c and 7d, and wiring hole 7e are formed.

  The electrode holder 10 includes an electrode holder main body 11 and a side panel 15 formed of an insulating member. The electrode holder body 11 has a substantially rectangular block shape, and is formed with a U-shaped cutout in the top surface 13 and a recess that opens in a U-shape on the top surface 13. A rod through hole 14b and a grinding fluid supply pipe insertion hole corresponding to the rod through hole 7b, the grinding fluid supply pipe insertion holes 7c and 7d, and the wiring hole 7e that open in the flange portion 7 of the base portion 5 at the rear part of the electrode holder body 11. 14c, 14d and wiring hole 14e are formed.

  On the other hand, the side panel 15 is formed in a rectangular flat plate shape having a tip surface 16 continuous with the tip surface 12 of the electrode holder body 11 and covering the top surface 13 of the electrode support body 11. The electrode holder main body 11 formed in this way is coupled to the base 6 of the base portion 5 by bolts 11b, and a side panel 15 is superimposed on the top surface 13 of the electrode holder main body 11, and is coupled by bolts 15b.

  Thereby, the front end surface 12 of the electrode holder main body 11 and the front end surface 16 of the side panel 15 have a rectangular cross-sectional shape having an opening 18 having an upper edge 18a, a lower edge 18b, and side edges 18c, 18d in the reference line Z direction. A continuous bottomed electrode housing portion 17 is formed.

  The electrode 20 for electrolytic dressing is made of, for example, iron having excellent conductivity, and as shown in FIG. 1 and FIG. 4 (a), a side view, and FIG. It is formed into a block shape continuous in the direction of the reference line Z with a rectangular cross section that is slidably inserted into the electrode accommodating portion 17 formed in the shape, and is divided into a rear end portion 23 and a front end portion 24 by a rectangular through hole 22. The

  The rear end portion 23 has a rod through groove 14b formed in the electrode holder body 11, grinding fluid supply pipe insertion holes 14c and 14d, a rod locking groove 23b and a grinding fluid supply pipe insertion hole 23c corresponding to the wiring hole 14e, 23d and a wiring hole 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 is opposed to the outer peripheral surface 4 of the metal bond grindstone 3 and has a lower end 25a, an upper end 25b, and both side ends 25c, 25d that serve as an upstream end and a downstream end in the rotation direction of the metal bond grindstone 3, and the metal bond grindstone 3 A rectangular shape having a length L that is continuous with a width W slightly wider than the width of the outer peripheral surface 4 of the metal bonding grindstone 3 and allows a grinding liquid to be interposed between the outer peripheral surface 4 of the metal bond grindstone 3, for example, 0.5 to 5 mm. It is formed in a cylindrical inner peripheral surface in which a degree 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 23 c and 23 d formed in the rear end portion 23. A plurality of grinding liquid discharge holes that are branched and opened in the electrode surface 25 are distributed and formed in the width direction of the electrode surface 25. In this embodiment, the cross section taken along the line II, II-II, and III-III in FIG. The first grinding liquid discharge hole 27a and the first grinding liquid discharge hole 27a having a relatively large diameter and a circular cross section that open to the center in the width direction in the vicinity of the lower end 25a of the electrode surface 25 on the upstream side of the bond grindstone 3 in the rotation direction. A pair of second grinding liquid discharge holes 27b, 27c having a circular cross section that opens away from the width direction on the downstream side in the rotation direction of the metal bond grindstone 3 adjacent to the metal bond grindstone 3, and further downstream in the rotation direction of the metal bond grindstone 3 A pair of circular cross-sections that are gradually separated from the grinding fluid passage 26 toward the electrode surface 25 side at the center in the length L direction of the electrode surface 25 and that are opened apart from each other in the vicinity of both ends of the electrode surface 25 in the width direction. Third grinding fluid discharge hole 27d With a 27e. Furthermore, the opening of the first grinding fluid discharge hole 27a on the electrode surface 25 and the opening of each second grinding fluid discharge hole 27b, 27c overlap in the width direction of the electrode surface 25, and each second grinding fluid discharge hole 27b, 27c. And the openings of the third grinding fluid discharge holes 27 d and 27 e overlap in the width direction 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 14b of the electrode holder main body 11 and the rod through hole 7b of the flange portion 7 and the distal end portion. A step 32 and a threaded portion are formed in 32a, a rod 32 having a threaded portion formed in the base end portion 32b, and a base end portion 32b of the rod 32 that passes through the rod through hole 31a of the adjusting base portion 31 via the adjusting base portion 31. A pair of adjusting nuts 33a and 33b that are screwed to face each other, a pair of flanged bushes 34a that fit into a rod locking groove 23b formed at the tip end portion 32a of the rod 32 and the rear end portion 23 of the electrode 20, and A fixture 34 is provided that is fixed to the rear end 23 by a nut 34b or the like. The electrode 20 is fixed by fixing the base end portion 32b of the rod 32 to the adjustment base portion 31 by a pair of adjustment nuts 33a and 33b screwed to the base end portion 32b of the rod 32, and the adjustment nuts 33a and 33b are loosened to loosen the rod. By moving the electrode 32 in the axial direction, the electrode 20 for electrolytic dressing moves in the electrode accommodating portion 17 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 14c and 14d and the grinding fluid supply pipe insertion holes 23c and 23d formed in the rear end portion 23 of the electrolytic dressing electrode 20 are movably penetrated to supply the grinding fluid supply ports 26a and 26b. The 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 4 of the metal bond grindstone 3 and the electrode surface 25 of the electrolytic dressing electrode 20 is formed. Is done. Here, the grinding fluid supplied from the grinding fluid supply source to the grinding fluid path 26 of the electrolytic dressing electrode 20 through the grinding fluid supply pipes 28a and 28b is fed to the outer peripheral surface of the metal bond grindstone 3 from the first grinding fluid discharge hole 27a. 4 is ejected so as to directly hit the outer peripheral surface 4 of the metal bond grindstone 3 toward the width direction central portion range 4a, and the both side ranges of the central portion 4a in the width direction of the outer peripheral surface 4 from the second grinding liquid discharge holes 27b and 27c. Part 4 overlaps with the width direction central part range 4a toward 4b and is jetted so as to hit the outer peripheral surface 4 of the metal bond grindstone 3 directly, and further from the third grinding fluid discharge holes 27d and 27e to the side part range 4b. Grinding of the metal bond grindstone 3 is jetted so as to partially overlap the side range 4b and hit the outer peripheral surface 4 of the metal bond grindstone 3 directly toward the side end range 4c between the side ends 3a and 3b. All of the outer peripheral surface 4 that becomes the surface Grinding liquid is injected to hit the outer peripheral surface 4 of the metal bonded grinding wheel 3 over.

  Further, the positive electrode is connected to the metal bond grindstone 3 via the apparatus main body and the rotating shaft 2, and the negative electrode is drilled in the wiring 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 front end portion 24 of the electrolytic dressing electrode 20 via the wiring hole 14e provided and the wiring 29 penetrating the wiring hole 23e formed in the rear end portion 23 of the electrolytic dressing electrode 20. Between the outer peripheral surface 4 and the electrode surface 25 is provided with a power source for energizing through the grinding fluid.

  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 20 for electrolytic dressing, The electrode surface 25 of the dressing electrode 20 and the outer peripheral surface 4 of the metal bond grindstone 3 are opposed to each other with a predetermined interval that enables the presence of the grinding fluid. Then, the adjustment nuts 33a and 33b are tightened to fix the rod 32, and the electrode 20 for electrolytic dressing 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 20 for electrolytic dressing via the grinding fluid supply pipes 28a and 28b, and the metal bond grindstone 3 is supplied from the first grinding fluid discharge hole 27a. Is ejected toward the central region 4a in the width direction of the outer peripheral surface 4, and is ejected from the second grinding liquid discharge holes 27b, 27c toward both side regions 4b of the central portion 4a in the width direction of the outer peripheral surface 4, and further It ejects from the grinding fluid discharge holes 27d, 27e toward the side end range 4c between the side range 4b and the side ends 3a, 3b. That is, the grinding fluid is metal over the entire width of the outer peripheral surface 4 that is the grinding surface of the metal bond grindstone 3 from the first grinding fluid ejection hole 27a, the second grinding fluid ejection holes 27b and 27c, and the third grinding fluid ejection holes 27d and 27e. The outer peripheral surface 4 of the bond grindstone 3 is ejected so as to hit directly.

  The grinding fluid is jetted and supplied from the first to third grinding fluid discharge holes 27a to 27e so as to directly hit the outer peripheral surface 4 of the metal bond grindstone 3 between the electrode surface 25 and the outer peripheral surface 4 of the metal bond grindstone 3. Turn on the power while maintaining the state.

  The current output from the power source includes the apparatus main body, the rotating shaft 2, the metal bond grindstone 3, the grinding liquid existing between the outer peripheral surface 4 of the metal bond grindstone 3 and the electrode surface 25 of the electrolytic dressing electrode 20, and the electrode for electrolytic dressing. 20, a negative voltage is applied to the electrolytic dressing electrode 20 by flowing through the path of the wiring 29 and the power source, and a positive voltage is applied to the metal bond grindstone 3 so that the electrolytic dressing of the outer peripheral surface 4 of the metal bond grindstone 3 which becomes a grinding surface is performed. Be started.

  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. Here, the outer peripheral surface 4 serving as the grinding surface of the metal bond grindstone 3 of the workpiece W is opposed to the metal even when the grinding liquid accompanying the metal bond grindstone 3 increases as the rotation speed of the metal bond grindstone 3 increases. Grinding liquid is also retained in the outer peripheral surface 4 of the bond grindstone 3 and the side region of the electrode 25 of the electrolytic dressing electrode 20 and covers the entire width of the outer peripheral surface 4 of the metal bond grindstone 3 and the electrode surface 25 of the electrolytic dressing electrode 20. Thus, the grinding liquid is held and uniform electrolytic dressing is applied to the outer peripheral surface 4 of the metal bond grindstone 3.

  This electrolytic dressing range will be described with reference to the action state explanatory diagram in FIG. 5A shows an outline of the electrode surface 25 of the electrolytic dressing electrode 20, FIG. 5B shows the existence range of the grinding fluid on the electrode surface 25 by hatching, and FIG. 5C shows the grinding surface of the metal bond grindstone 3. The electrolytic dressing range of a certain outer peripheral surface 4 is indicated by hatching.

  The outer peripheral surface 4 of the metal bond grindstone 3 facing the electrolytic dressing region and the electrode 20 for electrolytic dressing are formed from the first grinding fluid supply hole 27a, the second grinding fluid supply holes 27b and 27c, and the third grinding fluid supply holes 27d and 27e. The grinding liquid sprayed and supplied so as to strike the outer peripheral surface 4 of the metal bond grindstone 3 directly into the gap with the electrode surface 25 is driven by the outer peripheral surface 4 of the metal bond grindstone 3 that rotates with the grinding process and electrolysis is performed. It discharges | emits from the clearance gap between the upper end 25b of the electrode surface 25 used as the downstream end of a dressing area | region, and the outer peripheral surface 4 of the metal bond grindstone 3.

  However, it is ejected from the first grinding fluid discharge hole 27a toward the central region 4a in the width direction of the outer peripheral surface 4 of the metal bond grindstone 3 so as to directly hit the outer peripheral surface 4 of the metal bond grindstone 3, and the second grinding fluid discharge hole 27b and 27c are ejected so as to directly hit the outer peripheral surface 4 of the metal bond grindstone 3 so as to partially overlap the width-direction central region 4a toward both side regions 4b of the central portion 4a in the width direction of the outer peripheral surface 4. Further, the metal bond grindstone 3 partially overlaps the side range 4b from the third grinding fluid discharge holes 27d, 27e toward the side range 4c between the side range 4b and the side ends 3a, 3b. The outer peripheral surface 4 of the metal bond grindstone 3 is ejected so as to hit directly, and the grinding liquid is ejected so as to directly hit the outer peripheral surface 4 of the metal bond grindstone 3 over the entire width of the outer peripheral surface 4 serving as the grinding surface of the metal bond grindstone 3. As a result, as shown by hatching in the electrode surface 25 in (b), the electrode surface 25 is slightly diluted in the vicinity of the upper end 25b of the electrode surface 25 on the downstream side in the rotation direction of the metal bond grindstone 3 and in the vicinity of both side ends 25d and 25e of the electrode surface 25. In addition, the grinding fluid exists over the entire width of the electrode surface 25, and the electrolytic capacity is maintained in the portion, so that the electrolytic dressing is uniformly performed over the entire width of the outer peripheral surface 4 of the metal bond grindstone 3 as shown by hatching in (c). Applied.

  Therefore, according to the present embodiment, the outer peripheral surface 4 serving as the grinding surface of the metal bond grindstone 3 of the work W is always opposed to the electrode surface 25 of the electrode 21 for electrolytic dressing that is opposed regardless of an increase in the rotation speed of the metal bond grindstone 3. Direct hitting across the entire width of the outer peripheral surface 4 of the metal bond grindstone 3 across the entire width of the outer peripheral surface 4 of the metal bond grindstone 3 and the electrode surface 4 of the electrode 3 for electrolytic dressing 3 in the gap with the outer peripheral surface 4 of the metal bond grindstone 3 Thus, the sprayed grinding liquid is retained and held, and the outer peripheral surface 4 of the metal bond grindstone 3 is uniformly subjected to electrolytic dressing, so that the processing accuracy of the workpiece W and stable grinding quality can be ensured.

  Further, the inner diameters of the first to third grinding fluid discharge holes 27a to 27e and the arrangement of the first to third grinding fluid discharge holes 27a to 27e are changed or ground according to various electrolytic dressing requirements for the metal bond grindstone 3. The supply amount and supply distribution state of the grinding fluid can be changed by increasing / decreasing the number of the liquid discharge holes.

( First Reference Example )
A first reference example of the grinding apparatus according to the present invention will be described with reference to FIGS. This reference example different shapes of the implementation forms the electrolytic dressing electrode, other configurations with the same reference numerals site corresponding to FIG. 1 to FIG. 5 in FIG. 6 through FIG. 8 is similar to the form of implementation Thus, detailed description of the portion is omitted, and the electrode for electrolytic dressing will be mainly described.

  FIG. 6 is a perspective view schematically showing the grinding apparatus 1, FIG. 7 is an explanatory view of an electrode for electrolytic dressing, and FIG. 8 is an explanatory view of the action of dressing.

The electrode 40 for electrolytic dressing in the present reference example is an electrode housing formed in the electrode holder as shown in the side view in FIGS. 6 and 7A and the C arrow view in FIG. It is formed in a block shape continuous in the direction of the reference line Z with a rectangular cross section that is slidably inserted into the part, and is divided into a rear end part 43 and a front end part 44 by a rectangular through hole 42. The rear end portion 43 is formed with a rod locking groove 23b, grinding fluid supply pipe insertion holes 23c and 23d, and a wiring hole 23e.

  An electrode surface 45 having an arcuate cross section is formed on the distal end surface of the distal end portion 44. The electrode surface 45 is opposed to the outer peripheral surface 4 of the metal bond grindstone 3 and has a lower end 45a, an upper end 45b, and both side ends 45c, 45d which are upstream and downstream ends in the rotation direction of the metal bond grindstone 3, and the metal bond grindstone 3 The inner circumference of the cylinder is a rectangle having a length L that is continuous with a width W slightly larger than the width of the outer circumference surface 4, and a gap that allows the grinding fluid to intervene between the outer circumference surface 4 of the metal bond grindstone 3. It is formed in a planar shape.

  The front end portion 44 is formed with a grinding fluid passage 46 in which the grinding fluid supply ports 46 a and 46 b are opened corresponding to the grinding fluid supply pipe insertion holes 23 c and 23 d formed in the rear end portion 43. A grinding liquid discharge hole 47 that branches and opens in the electrode surface 45 is formed. The grinding liquid discharge hole 47 is close to the lower end 45a of the electrode surface 45 on the upstream side in the rotation direction of the metal bond grindstone 3 as shown in FIG. A base end range 47a extending to the electrode surface 45 with a cross-sectional shape extending in the width direction from the grinding liquid passage 46 and a tip end range gradually expanding in the width direction as the base end range 47a continues to the electrode surface 45 side. 47b, and opens in a slit shape having a long diameter over almost the entire width of the electrode surface 45.

The electrolytic dressing electrode 40, as in the form of implementation, is movably received in the electrode housing portion of the electrolyte holder is movably held by the electrode position adjusting section.

  On the other hand, a grinding fluid supply pipe for supplying a grinding fluid from a grinding fluid supply source (not shown) penetrates the grinding fluid supply pipe insertion holes 23c and 23d formed in the rear end portion 43 of the electrolytic dressing electrode 40 so as to be movable. Connected to the grinding fluid supply ports 46a and 46b, the grinding fluid is supplied from the grinding fluid supply source to the electrolytic dressing region formed between the outer peripheral surface 4 of the metal bond grindstone 3 and the electrode surface 45 of the electrolytic dressing electrode 40 facing each other. A grinding fluid supply means is formed. Here, the grinding liquid supplied from the grinding liquid supply source to the grinding liquid path 46 of the electrolytic dressing electrode 40 through the grinding liquid supply pipe extends over the entire width of the outer peripheral surface 4 of the metal bond grindstone 3 from the grinding liquid discharge hole 47. And then sprayed so as to strike the outer peripheral surface 4 of the metal bond grindstone 3 directly.

  Further, the positive electrode is connected to the metal bond grindstone 3 via the apparatus main body and the rotating shaft, and the negative electrode is connected to the wiring hole 43e formed in the rear end portion 43 of the electrolytic dressing electrode 40 through the wiring. And a power source that is connected to the tip 44 of the electrode 40 for electrolytic dressing and energizes through the grinding liquid between the outer peripheral surface 4 of the metal bond grindstone 3 and the electrode surface 45.

  The operation will be described below. In FIG. 6, before starting grinding with the metal bond grindstone 3, the electrode dressing electrode 40 is moved by the electrode position adjustment unit, and the electrode surface 45 of the electrode for electrode dressing 40 and the outer peripheral surface 4 of the metal bond grindstone 3 Are opposed to each other with a predetermined interval allowing the presence of the grinding fluid.

  Next, the grinding fluid is supplied from the grinding fluid supply source to the grinding fluid path 46 of the electrode 40 for electrolytic dressing through the grinding fluid supply pipe, and is directed from the grinding fluid discharge hole 47 to the entire width of the outer peripheral surface 4 of the metal bond grindstone 3. The outer surface 4 of the metal bond grindstone 3 is ejected so as to hit directly.

  While maintaining the state in which the grinding liquid is directly blown and supplied from the grinding liquid discharge hole 47 between the electrode surface 45 and the outer peripheral surface 4 of the metal bond grindstone 3, the power is turned on to the electrolytic dressing electrode 40. By applying a negative voltage and applying a positive voltage to the metal bond grindstone 3, electrolytic dressing of the outer peripheral surface 4 of the metal bond grindstone 3 serving as a grinding surface is started.

  In this state, the metal bond grindstone 3 is rotated and the workpiece is rotated to start grinding. Here, the outer peripheral surface 4 serving as the grinding surface of the metal bond grindstone 3 of the workpiece W is opposed to the metal even when the grinding liquid accompanying the metal bond grindstone 3 increases as the rotation speed of the metal bond grindstone 3 increases. Grinding fluid is also retained in the lateral region of the outer peripheral surface 4 of the bond grindstone 3 and the electrode 45 of the electrolytic dressing electrode 40, and covers the entire width of the outer peripheral surface 4 of the metal bond grindstone 3 and the electrode surface 45 of the electrolytic dressing electrode 40. Thus, the grinding liquid is held and uniform electrolytic dressing is applied to the outer peripheral surface 4 of the metal bond grindstone 3.

  This electrolytic dressing range will be described with reference to the action state explanatory diagram shown in FIG. 8A shows an outline of the electrode surface 45 of the electrolytic dressing electrode 40, FIG. 8B shows the existence range of the grinding fluid on the electrode surface 45 by hatching, and FIG. 8C shows the grinding surface of the metal bond grindstone 3. The electrolytic dressing range of a certain outer peripheral surface 4 is indicated by hatching.

  Metal bond in which the grinding fluid supplied from the grinding fluid supply hole 47 to the gap between the outer peripheral surface 4 of the opposing metal bond grindstone 3 serving as an electrolytic dressing region and the electrode surface 45 of the electrode for electrolytic dressing 40 rotates with grinding. Along with the outer peripheral surface 4 of the grindstone 3, it is discharged from the gap between the upper end 45 b of the electrode surface 45 and the outer peripheral surface 4 of the metal bond grindstone 3. However, the outer peripheral surface 4 of the metal bond grindstone 3 is ejected from the grinding liquid discharge hole 47 so as to directly hit the entire width of the outer peripheral surface 4 of the metal bond grindstone 3. As a result, as shown by hatching in the electrode surface 45 shown in (b), the both ends 45c and 45d of the electrode surface 45 are slightly diluted near the upper end 45b of the electrode surface 45 on the downstream side in the rotation direction of the metal bond grindstone 3. In addition, the grinding fluid exists over the entire width of the electrode surface 45, the electrolytic capacity is maintained in this portion, and the electrolytic dressing is uniformly distributed over the entire width of the outer peripheral surface 4 of the metal bond grindstone 3 as shown by hatching in (c). Applied.

Therefore, according to this reference example , the outer peripheral surface 4 which is the grinding surface of the metal bond grindstone 3 of the workpiece W is always opposed to the electrode surface 45 of the electrode 40 for electrolytic dressing facing the metal regardless of an increase in the rotation speed of the metal bond grindstone 3. Grinding liquid is retained and held on the outer peripheral surface 4 of the metal bond grindstone 3 between the outer peripheral surface 4 of the metal bond grindstone 3 and the electrode surface 45 of the electrode 40 for electrolytic dressing 40 between the outer peripheral surface 4 of the bond grindstone 3. Uniform electrolytic dressing is applied, and the processing accuracy and stable grinding quality of the workpiece W can be ensured.

  In addition, the supply amount and supply distribution state of the grinding fluid are changed by changing the inner diameter of the grinding fluid discharge hole 47 and the arrangement position of the cutting fluid discharge hole 47 in accordance with various electrolytic dressing requirements for the metal bond grindstone 3. Can do.

( Second reference example )
A second reference example of the grinding apparatus according to the present invention will be described with reference to FIGS. This reference example different shapes of the implementation forms the electrolytic dressing electrode, other configurations with the same reference numerals portions corresponding to FIGS. 1 to 5 9 to 11 is similar to the form of implementation Thus, detailed description of the portion is omitted, and the electrode for electrolytic dressing will be mainly described.

  9 is a perspective view schematically showing the grinding apparatus 1, FIG. 10 is an explanatory view of an electrode for electrolytic dressing, and FIG. 11 is an explanatory view of the action of the electrolytic dressing.

The electrode 50 for electrolytic dressing in the present reference example is an electrode housing formed in the electrode holder as shown in the side view in FIGS. 9 and 10A and the view in the arrow C in FIG. It is formed in a block shape continuous in the reference line Z direction with a rectangular cross section that is slidably inserted into the part, and is divided into a rear end part 53 and a front end part 54 by a rectangular through hole 52. The rear end portion 53 is formed with a rod locking groove 23b, grinding fluid supply pipe insertion holes 23c and 23d, and a wiring hole 23e.

  An electrode surface 55 having a circular arc cross section is formed on the distal end surface of the distal end portion 54. The electrode surface 55 is opposed to the outer peripheral surface 4 of the metal bond grindstone 3 and has a lower end 55a, an upper end 55b, and both side ends 55c, 55d which are upstream and downstream ends in the rotation direction of the metal bond grindstone 3, and the metal bond grindstone 3 A cylindrical inner peripheral surface that is a rectangle having a length L that is continuous with a width W slightly wider than the width of the outer peripheral surface 4 of the metal bonding grindstone 3, and that is formed with a gap between the outer peripheral surface 4 of the metal bond grindstone 3 and allowing the grinding fluid to intervene. It is formed in a shape.

  A grinding fluid path 56 is formed in the front end portion 54 corresponding to the grinding fluid supply pipe insertion holes 23 c and 43 d formed in the rear end portion 53. The grinding fluid passages 56 a and 56 b are opened from the grinding fluid path 56. There are two grinding fluid ejection holes 57a, an upstream grinding fluid ejection hole 57a that branches and opens close to the lower end 55a of the electrode surface 55, and a downstream grinding fluid ejection hole 57b that opens between the central portion and the upper end 55b. The electrolytic dressing grindstone 3 is drilled apart in the rotational direction.

  The upstream grinding fluid discharge hole 57a is close to the lower end 55a of the electrode surface 55 on the upstream side in the rotation direction of the metal bond grindstone 3 as shown in FIG. Thus, the cross-sectional shape extending in the width direction from the grinding fluid path 56 gradually widens in the width direction as it moves to the electrode surface 55 side, and opens in the form of a long-diameter slit over almost the entire width of the electrode surface 55.

  On the other hand, the downstream grinding fluid discharge hole 57b has an upper end 55a of the electrode surface 55 on the upstream side in the rotation direction of the metal bond grindstone 3, as shown in FIG. In the cross-sectional shape extending in the width direction from the grinding fluid path 56 between the center and the central portion, the width gradually increases in the width direction as it moves to the electrode surface 55 side, and the slit shape has a long diameter over almost the entire width of the electrode surface 55. Open to.

  Similar to the first embodiment, the electrode 50 for electrolytic dressing is movably accommodated in the electrode accommodating portion of the electrolytic holder, and is movably held by the electrode position adjusting portion.

  A grinding fluid supply pipe for supplying a grinding fluid from a grinding fluid supply source (not shown) penetrates the grinding fluid supply pipe insertion holes 23c and 23d formed in the rear end portion 53 of the electrolytic dressing electrode 50 so as to be movable. Grinding supplied to the electrolytic dressing region formed between the outer peripheral surface 4 of the metal bond grindstone 3 and the electrode surface 55 of the electrolytic dressing electrode 50 connected to the supply ports 56a and 56b and facing the grinding fluid from the grinding fluid supply source. A liquid supply means is formed. Here, the grinding fluid supplied from the grinding fluid supply source to the grinding fluid path 56 of the electrolytic dressing electrode 50 through the grinding fluid supply pipe is metal bonded from the upstream grinding fluid discharge hole 57a and the downstream grinding fluid discharge hole 57b. The grinding liquid is sprayed directly and dispersed uniformly over the entire width of the outer peripheral surface 4 of the grindstone 3.

  Further, the positive electrode is connected to the metal bond grindstone 3 through the apparatus main body and the rotating shaft, and the negative electrode is connected to the wiring hole 23e formed in the rear end portion 53 of the electrolytic dressing electrode 50 through the wiring. And a power source that is connected to the tip 54 of the electrode 50 for electrolytic dressing and energizes through the grinding liquid between the outer peripheral surface 4 of the metal bond grindstone 3 and the electrode surface 55.

  The operation will be described below. In FIG. 9, before starting the grinding with the metal bond grindstone 3, the electrode position adjusting unit 50 moves the electrolytic dressing electrode 50 so that the electrode surface 55 and the outer peripheral surface 4 of the metal bond grindstone 3 are free from the presence of the grinding liquid. They are opposed to each other with a predetermined interval.

  Next, the grinding fluid is supplied from the grinding fluid supply source to the grinding fluid path 56 of the electrode 50 for electrolytic dressing through the grinding fluid supply pipe, and metal bonding is performed from the upstream grinding fluid discharge hole 57a and the downstream grinding fluid discharge hole 57b. It ejects directly toward the full width of the outer peripheral surface 4 of the grindstone 3.

  From the upstream grinding fluid discharge hole 57a and the downstream grinding fluid discharge hole 57b, the grinding fluid was sprayed and supplied between the electrode surface 55 and the outer peripheral surface 4 of the metal bond grindstone 3 so as to hit the outer peripheral surface 4 directly. While maintaining the state, the power is turned on to apply a negative voltage to the electrolytic dressing electrode 50, and a positive voltage is applied to the metal bond grindstone 3 to electrolyze the outer peripheral surface 4 of the metal bond grindstone 3 that becomes the grinding surface. Dressing is started.

  In this state, the metal bond grindstone 3 is rotated and the workpiece is rotated to start grinding. Here, the outer peripheral surface 4 serving as the grinding surface of the metal bond grindstone 3 is always opposed to the electrode surface 55 of the electrode 50 for electrolytic dressing and the outer peripheral surface 4 of the metal bond grindstone 3 regardless of the increase in the rotation speed of the metal bond grindstone 3. The grinding fluid sprayed so as to directly hit the outer peripheral surface 4 of the metal bond grindstone 3 is retained and held over the entire width of the electrode surface 4 of the electrode 3 for electrolytic dressing and is applied to the outer peripheral surface 4 of the metal bond grindstone 3. A uniform electrolytic dressing is applied.

  The electrolytic dressing range will be described with reference to the action state explanatory diagram shown in FIG. 11A shows an outline of the electrode surface 55 of the electrolytic dressing electrode 50, FIG. 11B shows the existence range of the grinding fluid on the electrode surface 55 by hatching, and FIG. 11C shows the grinding surface of the metal bond grindstone 3. The electrolytic dressing range of a certain outer peripheral surface 4 is indicated by hatching.

  Metal is relatively upstream of the rotation direction of the metal bond grindstone 3 in the gap between the outer peripheral surface 4 of the opposing metal bond grindstone 3 serving as an electrolytic dressing region and the electrode surface 55 of the electrode 50 for electrolytic dressing from the upstream grinding fluid supply hole 57a. The gap between the outer peripheral surface 4 of the metal bond grindstone 3 and the electrode surface 55 of the electrode for electrolytic dressing 50 from the grinding fluid supplied and blown so as to directly hit the outer peripheral surface 4 of the bond grindstone 3 and the downstream grinding fluid supply hole 57b. The outer peripheral surface 4 of the metal bond grindstone 3 that is supplied with the grinding fluid that is sprayed and supplied so as to directly hit the outer peripheral surface 4 of the metal bond grindstone 3 on the downstream side in the rotation direction of the metal bond grindstone 3. Is released from the gap between the upper end 55 b of the electrode surface 55 and the outer peripheral surface 4 of the metal bond grindstone 3.

  However, the electrode surface 55 is in the vicinity of the upper end 55b of the electrode surface 55 that is jetted out from the upstream side grinding fluid discharge hole 57a over the entire width of the outer peripheral surface 4 of the metal bond grindstone 3 and is downstream in the rotation direction of the metal bond grindstone 3. The both ends 55d and 55e of the metal bonding grindstone 3 are slightly diluted. However, the grinding liquid is directly hit over the entire width of the outer peripheral surface 4 of the metal bond grindstone 3 from the downstream grinding liquid discharge hole 57b on the downstream side in the rotation direction of the metal bond grindstone 3. As shown by hatching in the electrode surface 55 in (b), the grinding fluid exists over the entire width of the electrode surface 55, and the electrolytic capacity is maintained in this part, as shown in (c) by hatching. Electrolytic dressing is applied uniformly over the entire width of the outer peripheral surface 4 of the metal bond grindstone 3.

Therefore, according to the present reference example , the outer peripheral surface 4 that is the grinding surface of the metal bond grindstone 3 of the workpiece W always faces the electrode surface 55 of the electrode 50 for electrolytic dressing facing the metal regardless of the increase in the rotation speed of the metal bond grindstone 3. Grinding fluid is retained and held on the outer peripheral surface 4 of the metal bond grindstone 3 between the outer peripheral surface 4 of the metal bond grindstone 3 and the electrode surface 55 of the electrode 50 for electrolytic dressing between the outer peripheral surface 4 of the bond grindstone 3. Uniform electrolytic dressing is applied, and the processing accuracy and stable grinding quality of the workpiece W can be ensured.

  Further, according to various electrolytic dressing requirements for the metal bond grindstone 3, the supply amount and supply distribution state of the grinding fluid can be changed by changing the inner diameter and the installation position of the upstream grinding fluid discharge hole 57a and the downstream grinding fluid discharge hole 57b. Can be changed.

  Further, a similar grinding fluid discharge hole may be additionally provided between the upstream grinding fluid discharge hole 57a and the downstream grinding fluid discharge hole 57b.

In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the meaning of invention. For example, the first to third grinding fluid grinding liquid discharge hole for supplying and ejecting a grinding fluid to the outer peripheral surface strikes over the entire width, in the form of implementation of the grinding fluid discharge hole of a circular cross section of the metal bonded wheel It was constructed by the discharge hole 27a~27e but can also be arranged as a grinding fluid discharge hole of polygonal section or elliptical or the like other shapes.

DESCRIPTION OF SYMBOLS 1 Grinding machine 3 Metal bond grindstone 4 Outer peripheral surface (grinding surface)
20 Electrode dressing electrode 25 Electrode surface 27a First grinding liquid discharge holes 27b, 27c Second grinding liquid discharge holes 27d, 27e Third grinding liquid discharge holes 40 Electrolytic dressing electrode 45 Electrode surface 47 Grinding liquid discharge hole 50 For electrolytic dressing Electrode 55 Electrode surface 56 Grinding fluid path 56a, 56b Grinding fluid supply port 57a Upstream grinding fluid discharge hole (grinding fluid discharge hole)
57b Downstream grinding fluid discharge hole (grinding fluid discharge hole)

Claims (3)

A metal bond grindstone in which abrasive grains that rotate to grind the workpiece by the outer peripheral surface are bonded by a conductive bond material, and an electrolytic process in which the electrode surface faces the gap between the outer peripheral surface of the metal bond grindstone and the grinding liquid. A metal bond that includes a dressing electrode and a power source that energizes the metal bond grindstone and the electrolytic dressing electrode with a grinding liquid interposed between the metal bond grindstone and the electrolytic dressing electrode, and rotates in the presence of the grinding liquid. In the grinding device that electrolytically dresses the metal bond grindstone by energizing the grindstone and the electrode for electrolytic dressing,
The electrode for electrolytic dressing is opened to the electrode surface and sprays the grinding liquid supplied from the grinding liquid supply means so as to directly hit the entire outer peripheral surface of the metal bond grindstone, and the outer peripheral surface of the opposing metal bond grindstone A plurality of grinding liquid discharge holes that are dispersed and opened in the width direction of the electrode surface in order to supply the grinding liquid to the gap between the electrode surface of the electrode for electrolytic dressing and
The plurality of grinding liquid discharge holes include a first grinding liquid discharge hole disposed at a central portion in the width direction of the electrode surface, and an opening portion of the first grinding liquid discharge hole in the width direction of the electrode surface. A pair of second grinding fluid discharge holes arranged at a position where a part of the opening overlaps, and a position where a part of the opening of the second grinding fluid discharge hole overlaps in the width direction of the electrode surface. A grinding apparatus comprising a pair of third grinding liquid discharge holes arranged . The second grinding liquid discharge hole is disposed downstream of the first grinding liquid discharge hole in the rotation direction of the metal bond grindstone, and the third grinding liquid discharge hole is formed of the metal bond from the second grinding liquid discharge hole. The grinding apparatus according to claim 1, wherein the grinding apparatus is disposed on the downstream side in the rotation direction of the grindstone . The grinding apparatus according to claim 1, wherein the first grinding liquid discharge hole has a larger diameter than the second grinding liquid discharge hole and the third grinding liquid discharge hole .

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