JP2009083034A - Honing device and method of cylindrical inner peripheral surface - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide honing device and method of a cylindrical inner peripheral surface having excellent working efficiency. <P>SOLUTION: When honing of the cylindrical inner peripheral surface Wa of a material W to be cut is performed by reciprocating and rotating a honing tool 10 arranged with a honing stick 20, electrolytic dressing is imparted to a distal end side range 20A of the honing stick 20 by applying voltage to an electrode 24 for electrolytic dressing arranged in an opposed cut material holding portion 21 under existence of water base coolant and the honing stick 20, and electrolytic dressing is applied to a base end side range 20B of the honing stick 20 by applying voltage to an electrode 34 for electrolytic dressing arranged in an opposed tool insertion guide 31 under existence of a conductive grinding liquid, and to the honing stick 20. The electrolytic dressing of the honing stick 20 can be performed at the same time as the honing, the high quality honing is provided, and working efficiency is improved. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a honing device for a cylindrical inner peripheral surface and a honing method for a cylindrical inner peripheral surface, and in particular, a honing tool in which a plurality of honing grindstones in which abrasive grains are fixed by a conductive coupling portion are arranged radially is used to cut a work material. The present invention relates to a honing device for a cylindrical inner peripheral surface for grinding a cylindrical inner peripheral surface and a honing method for a cylindrical inner peripheral surface.

  Conventionally, honing by a honing apparatus has been applied to finishing an inner peripheral surface extending in the axial direction and penetrating in a circular shape of a work material requiring high accuracy, that is, a so-called cylindrical inner peripheral surface. Honing is a processing method that efficiently improves processing accuracy such as roundness, straightness, and surface roughness of a cylindrical inner peripheral surface processed by precision boring, grinding, or the like.

  The honing device has, for example, a honing tool in which rod-shaped honing grindstones are arranged in a radial pattern. The honing device applies a radially outward contact pressure to the honing grindstone in contact with the cylindrical inner peripheral surface of the work material, while rotating the honing tool. The cylindrical inner peripheral surface is ground by applying a reciprocating motion in the rotation axis direction.

  Generally, a honing grindstone is a rod shape in which extremely hard and small abrasive grains such as aluminum oxide, silicon carbide, and diamond are bound by a binder, and the grindstone itself is simultaneously dressed by grinding the work material, that is, self-generated. A grindstone excellent in action (a phenomenon in which worn abrasive grains fall off and new abrasive grains protrude) is selected.

  However, since the dressing of the honing wheel depends on the self-generated action of the grinding wheel itself, the processing accuracy of the work material in the previous process by precision boring, grinding, etc., the variation in the shape etc. due to the manufacturing of the grinding wheel itself, honing The cycle of the self-generated action of the honing grindstone varies due to the contamination of the grinding fluid used for processing.

  If there is a variation in the self-acting cycle of this honing wheel, clogging with chips and drop-off crushed abrasive grains in the honing wheel gap, clogging that does not crush even if the abrasive grains wear, Concerns may arise, such as excessive grinding resistance and impact, which may cause spillage of abrasive grains, leading to deterioration of the machined surface roughness, grinding burn of the machined surface, grinding cracks, etc., and excessive machining time. Is done. For this reason, it is necessary to dress the honing grindstone frequently.

  On the other hand, in recent years, a metal bond grindstone is often used in which abrasive grains are bonded to a honing grindstone with a conductive bonding portion of bronze or cast iron. Various electrolytic dressings have been proposed as dressing methods for this type of honing grindstone.

  For example, in the honing grindstone dressing method disclosed in Patent Document 1, an electrolytic dress grindstone holder 102 is attached to the main shaft of the honing head 101 as shown in FIG. 13, and abrasive grains and a conductive coupling portion are attached to the grindstone holder 102. The honing grindstone 105 is arranged, and the electrode 103 having an arcuate facing surface 103a facing the outer peripheral surface serving as a processing surface of the honing grindstone 105 positioned and fixed to the grindstone holder 102 at a predetermined interval is disposed. In addition, a voltage applying means 104 such as a power supply device is provided between the honing grindstone 105 and the electrode 103 while supplying a conductive liquid such as an aqueous coolant to the facing surface 103a through the flow path 103b. Then, a predetermined voltage is applied between the honing grindstone 105 and the electrode 103, and at the same time, a conductive liquid such as an aqueous coolant is supplied between the honing grindstone 105 and the electrode 103 to conduct the conductivity of the outer surface of the honing grindstone 105. Electrolyze (electrolyze) the joint and dress the abrasive grains.

JP 2001-62721 A

  According to the above-mentioned Patent Document 1, when dressing the honing grindstone 105, the grindstone holder 102 for electrolytic dressing is attached to the main shaft of the honing head 101, and the honing grindstone 105 is attached to the grindstone holder 102 for electrolytic dressing. A grindstone holder 102 for electrolytic dressing is attached to the main shaft instead of the honing tool, and a honing grindstone 105 removed from the honing tool is attached to the grindstone holder 102. The troublesome work which removes the grindstone holder 102 from the spindle of the head 101 and attaches the honing tool is required, and many man-hours are required for dressing the honing grindstone 105. Affects the honing cycle, there is a concern that lowering the honing work efficiency.

  Therefore, the objective of this invention made | formed in view of this point is providing the honing apparatus and the honing method of a cylinder internal peripheral surface which are excellent in processing precision and working efficiency.

  In the invention of the honing device for the inner circumferential surface of the cylinder according to claim 1, which achieves the above object, a plurality of honing grindstones in which abrasive grains are fixed by a conductive coupling portion from the front end to the base end are arranged radially. A honing tool is inserted into a cylindrical inner peripheral surface that penetrates the work material along the rotation axis direction, and the honing tool rotates and the tip side range of the honing grindstone protrudes from one end of the work material. Cylinder inner circumference which performs honing processing on the cylinder inner circumferential surface by reciprocating in the direction of the rotation axis between the point position and the top dead center position where the base end side range of the honing grindstone protrudes from the other end of the work material In the surface honing device, the electrode surface is opposed to the outer surface of the honing grindstone that protrudes from one end of the work material on one end side of the work material, with a gap interposing the conductive grinding fluid. First A first electrolytic dressing means having a voltage applying means for applying a voltage to the electrode for undressing and the honing grindstone and the first electrode for electrolytic dressing; and other work material on the other end side of the work material A second electrode for electrolytic dressing and an electrode surface facing the outer surface of the honing grindstone protruding from the end of the base end side of the honing grindstone with a gap interposing the conductive grinding liquid, and the honing grindstone and the second electrolytic dressing A second electrolytic dressing means including a voltage applying means for applying a voltage to the electrode, and an outer surface in a tip side range of the honing grindstone protruding from one end of the work material, and a first electrode for electrolytic dressing A voltage is applied to the honing grindstone and the first electrode for electrolytic dressing in the presence of a conductive grinding fluid between the honing grindstone and the tip side of the honing grindstone The honing grindstone in the presence of a conductive grinding liquid between the outer surface in the base end side range of the honing grindstone protruding from the other end of the work material and the second electrolytic dressing electrode And applying a voltage to the second electrode for electrolytic dressing to electrolytically dress the proximal end side range of the honing grindstone.

  According to this invention, when a honing tool in which a plurality of honing grindstones are arranged radially is reciprocated and rotated between a bottom dead center position and a top dead center position, the cylindrical inner peripheral surface of the work material is honed. In addition, in the first dressing means in which the first electrode for electrolytic dressing is disposed, electrolytic dressing is applied to the tip side region of the honing grindstone in the presence of the conductive grinding liquid, and the second electrode for electrolytic dressing is disposed. By applying electrolytic dressing to the base end side range of the honing wheel in the presence of the conductive grinding fluid in the second dressing means, stable quality without variation in surface roughness due to the honing wheel that is always dressed well Honing process becomes possible. Also, the honing wheel can be electrolytically dressed simultaneously with the honing process, the honing wheel electrolytic dressing can be performed without affecting the honing cycle, and the honing tool can be removed for conventional troublesome honing wheel dressing. Working efficiency is improved in combination with the fact that no need is required.

  According to a second aspect of the present invention, in the honing device for the cylindrical inner peripheral surface of the first aspect, the length in the rotation axis direction of the tip side range of the honing grindstone protruding from one end of the work material and the work material The total length of the length in the rotation axis direction of the base end side range of the honing grindstone protruding from the other end is larger than the length of the honing grindstone in the rotation axis direction.

  According to this invention, the length in the rotation axis direction of the distal end side range of the honing grindstone protruding from one end side of the work material and the length in the rotation axis direction of the proximal end range of the honing grindstone protruding from the other end side of the work material By setting the total length to be larger than the length of the honing grindstone in the rotation axis direction, a distal end side range for electrolytic dressing by the first electrolytic dressing means and a proximal end side for electrolytic dressing by the second electrolytic dressing means An overlapping range in which the first and second electrolytic dressing means and the second electrolytic dressing means are both electrodressed and dressed with each other is formed, and the electrolytic dressing is surely applied from one end of the honing grindstone to the entire length of the base end.

  According to a third aspect of the present invention, in the honing device for a cylindrical inner peripheral surface according to the first or second aspect, the first electrode for electrolytic dressing is a front end side range of the honing grindstone protruding from one end of the work material. The outer surface and the electrode surface of the cylinder are opposed to each other and have a cylindrical shape extending in the rotation axis direction of the honing tool.

  According to the present invention, the honing grindstone is subjected to electrolytic dressing by applying a voltage to the cylindrical first electrode for electrolytic dressing and the honing grind radially arranged on the honing tool in the presence of the conductive cutting fluid. Therefore, uniform electrolytic dressing can be applied to each honing grindstone.

  According to a fourth aspect of the present invention, in the honing device for a cylindrical inner peripheral surface according to the first or second aspect, the first electrode for electrolytic dressing is a front end side range of the honing grindstone protruding from one end of the work material. The outer surface and the electrode surface are opposite to each other and have a circular arc shape extending in the direction of the rotation axis of the honing tool.

  According to the present invention, a voltage is applied in a state where the honing tool is rotated to the first electrolytic dressing electrode having an arcuate cross section and the honing grindstone arranged radially on the honing tool in the presence of the conductive cutting fluid. Since an electrolytic dressing is applied to the honing grindstone, a uniform electrolytic dressing is applied to each honing grindstone.

  In the invention of the honing device for a cylindrical inner peripheral surface according to claim 5, which achieves the above object, a plurality of honing grindstones in which abrasive grains are fixed by a conductive coupling portion from a distal end to a proximal end are arranged radially. Inside the tool insertion guide disposed on the other end side of the work material in the cylindrical inner peripheral surface passing through the work material held at the work material holding part at one end of the honing tool along the rotation axis direction. The bottom dead center position where the distal end side range of the honing grindstone protrudes from one end of the work material while rotating the honing tool and the proximal end side of the honing grindstone from the other end of the work material In the honing device for the cylindrical inner peripheral surface that reciprocates in the direction of the rotation axis between the top dead center position where the range protrudes, and honing the cylindrical inner peripheral surface, the workpiece holding unit holds the workpiece One end of the work material disposed on the inner peripheral surface of the main body A first electrolytic dressing electrode that faces the outer surface of the honing grindstone protruding from the front surface of the honing grindstone with a gap interposing the conductive grinding fluid; the honing grindstone and the first electrolytic dressing electrode Voltage applying means for applying a voltage to the tool insertion guide, and the tool insertion guide is disposed on an inner peripheral surface of the tool insertion guide main body and is disposed outside the proximal end side range of the honing grindstone protruding from the other end of the work material. A second electrode dressing electrode facing the surface with a gap interposing the conductive grinding fluid, and a voltage applying means for applying a voltage to the honing grindstone and the second electrolytic dressing electrode, In the presence of a conductive grinding liquid between the outer surface in the tip side range of the honing grindstone protruding from one end of the work material and the first electrode for electrolytic dressing Applying an electric voltage to the honing grindstone and the first electrolytic lessening electrode to electrolytically dress the distal end side range of the honing grindstone, and an outer surface in the proximal end range of the honing grindstone protruding from the other end of the work material; Applying a voltage to the honing grindstone and the second electrolytic dressing electrode in the presence of a conductive grinding fluid between the second electrolytic dressing electrode and electrolytic dressing the proximal end side range of the honing grindstone. Features.

  According to the present invention, when the honing tool in which the honing grindstone is arranged radially is reciprocated and rotated between the bottom dead center position and the top dead center position, the cylindrical inner peripheral surface of the work material is honed. A voltage is applied to the first electrode for electrolytic dressing and the honing grindstone disposed on the main body of the work material holding portion of the work material holding portion facing each other in the presence of the conductive grinding fluid to electrolyze the tip side of the honing grindstone. Applying a voltage to the second electrode for electrolytic dressing and the honing grindstone arranged in the tool insertion guide body of the tool insertion guide facing each other in the presence of the conductive grinding fluid in the presence of the conductive grinding fluid, to the base end side range of the honing grindstone By applying the electrolytic dressing, it is possible to perform a honing process with a stable quality without variation in surface roughness by a honing grindstone that is always dressed well. Moreover, the electrolytic dressing of the honing grindstone can be performed simultaneously with the honing process, and the working efficiency is improved.

  Furthermore, since the first electrolytic dressing electrode and the first electrolytic dressing electrode are disposed in the work material holding part and the tool insertion guide, respectively, there is no need to newly provide electrolytic dressing means, and the existing honing apparatus The manufacturing cost can be reduced without complicating the apparatus and work.

  According to a sixth aspect of the present invention, in the honing device for the cylindrical inner peripheral surface of the fifth aspect, the length in the rotation axis direction of the tip side range of the honing grindstone protruding from one end of the work material and the work material The total length of the length in the rotation axis direction of the base end side range of the honing grindstone protruding from the other end side is larger than the length of the honing grindstone in the rotation axis direction.

  According to the present invention, the length of the honing grindstone protruding in the work material holding portion from one end of the work material in the direction of the rotational axis and the base of the honing grindstone projecting into the tool insertion guide from the other end of the work material. The total length of the end range in the direction of the rotation axis is set to be larger than the length of the honing grindstone in the direction of the rotation axis, so that the end range and the second electrolytic dressing that are electrolytically dressed by the first electrolytic dressing electrode An overlapping range in which both the first electrolytic dressing electrode and the second electrolytic dressing electrode are electrolytically dressed with each other is formed with the base end side range to be electrolytically dressed by the electrode, and the length of the honing grindstone is reliably extended from one end to the entire base end. Electrolytic dressing is applied.

  According to a seventh aspect of the present invention, in the honing device for a cylindrical inner peripheral surface according to the fifth or sixth aspect, the first electrode for electrolytic dressing is disposed on the inner peripheral surface of the work material holding portion main body. The outer surface of the honing grindstone protruding from one end of the cutting material and the electrode surface are opposed to each other and have a cylindrical shape extending in the direction of the rotation axis of the honing tool.

  According to the present invention, a voltage is applied to the honing grindstone arranged radially in the honing tool and the cylindrical first electrode for electrolytic dressing facing each other in the presence of the conductive cutting fluid, and the honing grindstone is subjected to the electrolytic dressing. Therefore, uniform electrolytic dressing can be applied to each honing grindstone.

  The invention according to claim 8 is the honing apparatus for the cylindrical inner peripheral surface of claim 5 or 6, wherein the first electrode for electrolytic dressing is spaced circumferentially on the inner peripheral surface of the work material holder main body. The outer surface and the electrode surface in the front end side range of the honing grindstone that are arranged apart from each other and project from one end of the work material are opposed to each other and have a circular arc shape extending in the rotation axis direction. .

  According to the present invention, a voltage is applied in a state where the honing tool is rotated to the first electrolytic dressing electrode having an arcuate cross section and the honing grindstone arranged radially on the honing tool in the presence of the conductive cutting fluid. Since the honing grindstone is subjected to electrolytic dressing, uniform honing grindstone can be applied to each honing grindstone.

  The invention according to claim 9 is the honing device for the cylindrical inner peripheral surface according to claim 5 or 6, wherein the work material holding part includes a plurality of work material holding part bodies divided in the circumferential direction, The first electrolytic dressing electrode is disposed on the inner periphery of each work material holding portion main body, and the electrode surface is opposed to the outer surface in the tip side range of the honing grindstone protruding from one end of the work material. It is characterized by having a circular arc cross section extending in the direction.

  According to this invention, the work material holding portion includes the plurality of work material holding portion main bodies divided in the circumferential direction, and the first electrolytic dressing having an arc-shaped cross section on the inner periphery of each work material holding portion main body. By disposing the working electrode, the work material shape limitation due to the contact between the work material holding portion and the work material is relaxed.

  A tenth aspect of the present invention is the honing device for a cylindrical inner peripheral surface according to any one of the fifth to ninth aspects, wherein an insulating member is provided between the work material holding portion main body and the first electrode for electrolytic dressing. It is characterized by intervening.

  According to the present invention, when the insulating material is interposed between the work material holding portion main body and the first electrolytic dressing electrode, the work material holding portion main body is formed of a conductive material such as iron. Also, a good electrolytic dressing can be applied to the honing grindstone.

  The invention according to claim 11 is the honing device for the cylindrical inner peripheral surface according to any one of claims 5 to 10, wherein an insulating member is interposed between the tool insertion guide body and the second electrode for electrolytic dressing. It is characterized by that.

  According to the present invention, since the insulating member is interposed between the tool insertion guide body and the second electrode for electrolytic dressing, the honing grindstone can be used even when the tool insertion guide body is formed of a conductive material such as iron. A good electrolytic dressing can be applied.

  The invention of the honing method of the inner circumferential surface of the cylinder according to claim 12, which achieves the above object, includes a plurality of honing grindstones in which abrasive grains are fixed by a conductive coupling portion from the tip to the base end in a radial manner. A honing tool is inserted into a cylindrical inner peripheral surface that penetrates the work material along the rotation axis direction, and the honing tool rotates and the tip side range of the honing grindstone protrudes from one end of the work material. Cylinder inner circumference which performs honing processing on the cylinder inner circumferential surface by reciprocating in the direction of the rotation axis between the point position and the top dead center position where the base end side range of the honing grindstone protrudes from the other end of the work material In the surface honing method, the electrode surface faces the outer surface of the honing grindstone protruding from one end of the work material on one end side of the work material with a gap interposing the conductive grinding fluid. First An electrode for electrolytic dressing, a honing grindstone, a first electrolytic dressing means having a voltage applying means for applying a voltage to the first electrode for electrolytic dressing, and the work material on the other end side of the work material. The second electrode for electrolytic dressing, the electrode surface facing the outer surface in the base end side range of the honing grindstone protruding from the other end and a gap interposing the conductive grinding liquid, and the honing grindstone and the second electrolysis A second electrolytic dressing means having a voltage applying means for applying a voltage to the dressing electrode, and facing the workpiece when the tip side region of the honing grindstone protrudes from one end of the work material in the honing process. Conductive grinding fluid between the outer surface in the tip side range of the honing grindstone protruding from one end of the cutting material and the first electrode for electrolytic dressing In the presence, a voltage is applied to the honing grindstone and the first electrode for electrolytic dressing to electrolytically dress the distal end range of the honing grindstone, and the proximal end range of the honing grindstone protrudes from the other end of the work material. The honing grindstone and the second electrode in the presence of a conductive grinding liquid between the outer surface in the proximal end range of the honing grindstone protruding from the other end of the work material and the second electrode for electrolytic dressing. A voltage is applied to the electrode for electrolytic dressing to electrolytically dress the base end side range of the honing grindstone.

  According to the present invention, when the honing tool in which the honing grindstone is arranged radially is reciprocated and rotated between the bottom dead center position and the top dead center position, the cylindrical inner peripheral surface of the work material is honed. In the first dressing means in which the first electrode for electrolytic dressing is disposed, electrolytic dressing is applied to the tip side region of the honing grindstone in the presence of the conductive grinding liquid, and the second electrode for electrolytic dressing is disposed. In addition, in the second dressing means, by applying electrolytic dressing to the base end side range of the honing grindstone in the presence of the conductive grinding fluid, it is possible to achieve stable quality without variation in surface roughness due to the honing grind that is always dressed well. Honing or processing becomes possible. Moreover, the electrolytic dressing of the honing grindstone can be performed simultaneously with the honing processing, and the working efficiency is improved.

  According to the invention of the honing method for the inner circumferential surface of the cylinder according to claim 13, which achieves the above object, a plurality of honing grindstones in which abrasive grains are fixed by a conductive coupling portion from the front end to the base end are arranged radially. Inside the tool insertion guide disposed on the other end side of the work material in the cylindrical inner peripheral surface passing through the work material held at the work material holding part at one end of the honing tool along the rotation axis direction. The bottom dead center position where the distal end side range of the honing grindstone protrudes from one end of the work material while rotating the honing tool and the proximal end side of the honing grindstone from the other end of the work material In the honing method of the cylindrical inner peripheral surface in which the cylindrical inner peripheral surface is honed by reciprocating in the rotation axis direction between the top dead center position where the range protrudes, the work material holding portion holds the work material One end of the work material disposed on the inner periphery of the main part A first electrolytic dressing electrode that faces the outer surface of the honing grindstone protruding from the front surface of the honing grindstone with a gap interposing the conductive grinding fluid; the honing grindstone and the first electrolytic dressing electrode The tool insertion guide is disposed on the inner periphery of the tool insertion guide main body, and protrudes from the other end of the work material. And a second electrode dressing electrode opposed to each other with a gap interposing the conductive grinding liquid, and a voltage applying means for applying a voltage to the honing grindstone and the second electrolytic dressing electrode, The honing grind projecting from one end of the work material facing when the tip side range of the honing grindstone projects from one end of the work material in honing A voltage is applied to the honing grindstone and the first electrolytic lessening electrode in the presence of a conductive grinding liquid between the outer surface in the front end side range and the first electrolytic dressing electrode, and the front end side of the honing grindstone Electrolytic dressing range, and when the base end side range of the honing grindstone protrudes from the other end of the work material, the outer surface and the second surface in the tip side range of the honing grindstone protruding from the other end of the work material A voltage is applied to the honing grindstone and the second electrolytic dressing electrode in the presence of a conductive grinding fluid between the electrode for electrolytic dressing and the base end side range of the honing grindstone is electrolytically dressed. .

  According to the present invention, when the honing tool in which the honing grindstone is radially arranged is reciprocated and rotated between the bottom dead center position and the top dead center position, the cylindrical inner peripheral surface of the work material is honed. A voltage is applied to the first electrode for electrolytic dressing and the honing grindstone disposed on the main body of the work material holding portion of the work material holding portion facing each other in the presence of the conductive grinding fluid to electrolyze the tip side of the honing grindstone. The base end side range of the honing grindstone by applying a voltage to the second electrode for electrolytic dressing and the honing grindstone disposed on the tool insertion guide main body of the tool insertion guide facing the dressing and in the presence of the conductive grinding fluid By applying the electrolytic dressing to the surface, it becomes possible to perform a honing process with a stable quality without a variation in surface roughness by a honing grindstone that is always well dressed. Moreover, the electrolytic dressing of the honing grindstone can be performed simultaneously with the honing processing, and the working efficiency is improved.

  The invention according to claim 14 is the honing method of the cylindrical inner peripheral surface according to claim 12 or 13, wherein the length of the honing grindstone protruding from one end of the work material in the direction of the rotation axis and the length The total length of the length in the rotation axis direction of the base end side range of the honing grindstone protruding from the other end of the work material is larger than the length of the honing grindstone in the rotation axis direction.

  According to this invention, the length in the rotation axis direction of the tip side range of the honing grindstone protruding from one end of the work material and the length in the rotation axis direction of the base end side range of the honing grindstone protruding from the other end of the work material By setting the total length to be larger than the length of the honing grindstone in the rotation axis direction, there is a distal end side range electrolytically dressed by the first electrolytic dressing means and a proximal end range electrolytically dressed by the second electrolytic dressing means. An overlapping range in which electrolytic dressing is performed by the first electrolytic dressing means and the second electrolytic dressing means is formed, and the electrolytic dressing is reliably applied from one end to the base end of the honing grindstone.

  According to the present invention, when the honing tool in which the honing grindstone is radially arranged is reciprocated and rotated between the bottom dead center position and the top dead center position, the cylindrical inner peripheral surface of the work material is honed. Electrolytic dressing is applied to the tip side region of the honing grindstone with the first electrode for electrolytic dressing facing in the presence of the conductive grinding fluid, and honing grindstone with the second electrode for electrolytic dressing facing in the presence of the conductive grinding fluid Since the electrolytic dressing is applied to the base end side of the honing wheel, it is possible to perform honing with stable quality using the honing wheel that is always well electrolytic dressed, and the electrolytic dressing of the honing wheel can be performed at the same time as the honing. improves.

  Embodiments of a honing device for a cylindrical inner peripheral surface and a honing method for a cylindrical inner peripheral surface according to the present invention will be described below with reference to FIGS.

  FIG. 1 is a schematic explanatory diagram of the honing apparatus 1. In describing the honing device 1, an outline of the work material W to be ground by the honing device 1 will be described. As shown in a phantom line in FIG. 1, the work material W is a cylinder liner or the like used in an engine, for example, and extends along the axis from the lower end Wb as one end to the upper end Wc as the other end. A cylindrical portion having a circular cross section extending through the inner peripheral surface, that is, a so-called cylindrical inner peripheral surface Wa and outer peripheral surface Wd, and the cylindrical inner peripheral surface Wa is ground by the honing device 1, that is, a honing process. It becomes.

  The honing apparatus 1 includes a honing tool 10 that is swingably supported by a honing head 2 that moves down and ascends along a rotation axis Z, and a work material that includes a first electrolytic dressing means that positions and holds the work material W. The holding part 21 is arranged above the work material W positioned and held by the work material holding part 21 to clamp and hold the work material W and guide the honing tool 10 to the cylindrical inner peripheral surface Wa serving as a grinding part. A tool insertion guide 31 having a second electrolytic dressing means for guiding is provided.

  The honing tool 10 is shown in a block diagram in FIG. 2, and FIG. 3 is a hollow cylindrical shape whose upper end is supported by a honing head 2 serving as a driving device provided with a spindle motor or the like, as shown in FIG. The honing tool main body 11 is provided. A plurality of, in the present embodiment, twelve honing shoe guide holes 12 extending along the extending direction of the rotation axis Z are opened at equal intervals on the outer periphery of the honing tool body 11, and are slid into the honing shoe guide holes 12. The first honing shoe 13A and the second hosing shoe 13B are alternately fitted and mounted so as to be movable in a radial direction that is guided by movement and moves toward and away from the rotation axis Z.

  In the first honing shoe 13A and the second honing shoe 13B, a grindstone mounting groove 13a extending along the rotation axis Z direction is formed on the outer end surface, and both side surfaces 13b are slidable on the end surface 12b of the honing shoe guide hole 12. The engaging grooves 13c and 13d are formed at both ends of the outer peripheral surface, respectively.

  A proximal-side tapered surface 13Aa and a distal-side tapered surface 13Ab that gradually approach the rotational axis Z are formed in the proximal-side range and the distal-side range of the inner end surface of the first honing shoe 13A as they move from the proximal side to the distal side. Has been. A proximal-side tapered surface 13Ba and a distal-side tapered surface 13Bb that gradually approach the rotation axis Z as the transition from the proximal end side to the distal end side occurs in the proximal end range and the distal end range of the inner end surface of the second honing shoe 13B, respectively. Has been. The engaging grooves 13c and 13d of the first honing shoe 13A and the second honing shoe 13B are fitted with annular spring bands 14a and 14b serving as a diameter urging means, and the spring bands 14a and 14b respectively The first honing shoe 13A and the second honing shoe 13B are urged in a direction approaching the rotation axis Z, that is, in a radially inwardly reducing diameter direction.

  A rod-shaped grindstone extending along the rotation axis Z direction, that is, a honing grindstone 20 is attached to each grindstone mounting groove 13a of the first honing shoe 13A and the second honing shoe 13B. The honing grindstone 20 is composed of, for example, a metal bond grindstone in which abrasive grains such as diamond, CBN (cubic boron nitride), crystalline aluminum oxide, silicon carbide, and the like are bonded by a conductive bonding portion made of bronze or cast iron. Yes.

  Further, a plurality of honing guide member mounting grooves 11a extending along the rotation axis Z direction at equal intervals are formed on the outer periphery of the honing tool main body 11, and the honing guide member mounting grooves 11a are made of ceramic or the like via the mounting member 15. A honing guide member 16 extending in the direction of the rotation axis Z is attached. The distance from the rotation axis Z to the outer peripheral surface 16a of each honing guide member 16 is formed constant. Further, an air passage 11b for an air micrometer (not shown) for accurately measuring the gap between the outer peripheral surface 16a of the honing guide member 16 and the honing processing surface by air pressure is formed in the honing tool main body 11 so that the outer peripheral surface of the honing guide member 16 is provided. It opens to 16a.

  The proximal end side penetrating through the honing tool main body 11 and slidably comes into contact with the proximal tapered surface 13Aa and the distal tapered surface 13Ab of the first honing shoe 13A and gradually approaches the rotation axis Z as it moves to the distal end side. A first expansion / contraction bar 17 </ b> A having a tapered surface 17 </ b> Aa and a tip-side tapered surface 17 </ b> Ab is disposed in the honing tool main body 11. Further, a base which is coupled to the first expansion / contraction bar 17A and slidably contacts the proximal side taper surface 13Ba and the distal side taper surface 13Bb of the second honing shoe 13B and gradually approaches the rotation axis Z as it moves to the distal end side. A second expansion / contraction bar 17B in which the end tapered surface 17Ba and the tip tapered surface 17Bb are formed is disposed in the honing tool main body 11.

  The first expansion / contraction bar 17 </ b> A and the second expansion / contraction bar 17 </ b> B are pulled and released by a traction operation mechanism (not shown) disposed in the honing head 1. Further, the first expansion / contraction bar 17A and the second expansion / contraction bar 17B are constantly urged toward the distal end side by a spring 18 disposed in the honing tool main body 11.

  By releasing the traction by the traction operation mechanism of the honing head 1, the proximal end side taper surface 17Aa and the front end side taper surface 17Ab of the first expansion / contraction bar 17A are respectively urged by the spring 18 and the proximal end side taper surface 13Aa of the first honing shoe 13A. The first honing shoes 13A are pushed outward in the radial direction away from the rotation axis Z while being in pressure contact with the tip side taper surface 13Ab. Similarly, the proximal end tapered surface 17Ba and the distal end tapered surface 17Bb of the second expansion / contraction bar 17B are in pressure contact with the proximal end tapered surface 13Ba and the distal end tapered surface 13Bb of the second honing shoe 13B, respectively. 13B is pushed outward in the radial direction away from the rotation axis Z, that is, in the diameter increasing direction.

  On the other hand, by pulling the first expansion / contraction bar 17A and the second expansion / contraction bar 17B by the pulling operation mechanism against the urging of the spring 18, the proximal-side taper surface 17Aa and the distal-side taper surface 17Ab of the first expansion / contraction bar 17A. The second honing shoe by the proximal end taper surface 17Ba and the distal end side taper surface 17Bb of the second expansion / contraction bar 17B is released, while the pressing of the proximal end taper surface 13Aa and the distal end side taper surface 13Ab of the first honing shoe 13A is released. The pressing of the proximal end taper surface 13Ba and the distal end taper surface 13Bb of 13B is released. The first honing shoe 13A and the second honing shoe 13B released from pressing by the first expansion / contraction bar 17A and the second expansion / contraction bar 17B are moved in the direction approaching the rotation axis Z by the spring bands 14a and 14b, that is, the diameter reducing direction. Move to.

  In addition, between the 1st expansion / contraction bar 17A of the honing tool 10, the 2nd expansion / contraction bar 17B, and the honing head 2, the insulation process is performed, and the electrode 19 is provided in the honing tool main body 11 as shown in FIG. The electrode 19 and each honing grindstone 20 are connected to each other through the honing tool body 11, the first honing shoe 13A, and the second honing shoe 13B so as to be conductive.

  Here, when the honing tool main body 11, the first expansion / contraction bar 17A, and the second expansion / contraction bar 17B are conductive iron materials, the first honing shoe 13A and the second honing shoe are caused by rusting due to electrolysis at the time of electrolytic dressing described later. In order to prevent 13B from sliding on each honing shoe guide hole 12, that is, causing a decrease in movement, the first honing shoe 13A and the second honing shoe 13B are made of the same conductive material and are excellent in oxidation resistance. It is preferable to form by. Similarly, the spring bands 14a and 14b are also preferably made of a stainless steel or rubber O-ring having excellent oxidation resistance. Furthermore, it is preferable to apply an insulating paint to the outer surface of the honing tool body 11 to prevent rust.

  As shown in FIG. 4 corresponding to the enlarged view of the IV part of FIGS. 1 and 1, the work material holding part 21 also serving as the first electrolytic dressing means holds the hollow cylindrical work material supported by the base 3. A flange 23b is formed on the inner periphery 22a of the work material holding portion main body 22 and made of, for example, MC nylon or the like, protruding outward at the upper end and abutting on the upper end 22b of the work material holding portion main body 22. The insulating member 23 is fitted, and an electrolytic dressing electrode (hereinafter referred to as ELID electrode) 24 serving as a cylindrical first electrolytic dressing electrode is provided on the inner periphery 23 a of the insulating member 23. The ELID electrode 24 is made of, for example, iron, and has a cylindrical inner peripheral electrode surface 24a that is continuous with the rotation axis Z and in the rotation axis Z direction on the inner periphery. The electrode surface 24a allows the insertion of the honing tool 11 and the honing grindstone 20 that protrude from the lower end Wb of the work material W during honing on a cylindrical inner peripheral surface Wa of the work material W, which will be described later, and the outside of the honing grindstone 20 A gap, for example, about 1 to 5 mm is formed between the outer surface 20a of the honing grindstone 20 and the outer surface 20a of the honing grindstone 20 so as to allow the aqueous coolant as the conductive grinding liquid to be interposed therebetween. Further, the ELID electrode 24 is connected to an electrode terminal 25 protruding outward from the work material holding portion main body 22, and this electrode terminal 25 is connected to a negative electrode (−electrode) of a voltage applying means (not shown).

  Further, an annular work material positioning member 26 is disposed on the upper end 22b of the work material holding part main body 22 with a flange 23b of the insulating member 23 interposed therebetween. The outer peripheral surface Wd of the work material W is fitted along the outer periphery of the annular placement surface 27a and the placement surface 27a which can be brought into contact with the lower end Wb of the work material W on the upper surface of the work material positioning member 26. A work material positioning portion 27 including a possible annular engaging portion 27b is formed.

  The tool insertion guide 31 also serving as the second electrolytic dressing means is a hollow cylindrical tool insertion guide main body extending along the rotation axis Z direction as shown in FIG. 32, and is supported by the movable member 6 so as to be movable up and down between an unclamping position raised along the rotation axis Z and a clamping position lowered.

  On the inner periphery 32a of the tool insertion guide main body 32, for example, a cylindrical lower end made of MC nylon or the like is formed with a mounting portion 33b that expands in a flange shape and comes into contact with the lower end 32b of the main body 32, and the insulating member 33 is fitted. The ELID electrode 34 serving as a cylindrical second electrode for electrolytic dressing is provided on the inner periphery 33 a of the insulating member 33. The ELID electrode 34 is made of, for example, iron, and a cylindrical inner peripheral surface electrode surface 34a is formed around the rotation axis Z and continuous in the rotation axis Z direction on the inner periphery. The electrode surface 34a allows the insertion of the honing tool 11 and the honing grindstone 20 that protrude from the upper end Wc of the work material W during honing on a cylindrical inner peripheral surface Wa of the work material W, which will be described later, and the outside of the honing grindstone 20 A gap, for example, about 1 to 5 mm is formed between the outer surface 20a of the honing grindstone 20 and the surface 20a to allow the water coolant to intervene. The ELID electrode 34 is connected to an electrode terminal 35 projecting outward from the tool insertion guide main body 32, and the electrode terminal 35 is connected to a negative electrode (negative electrode) of a voltage applying means (not shown).

  A clamp member 36 in which an annular pressing surface 36a is formed on the lower end 32b of the tool insertion guide main body 32 with an attachment portion 33b of the insulating member 33 interposed therebetween is disposed, and the tool insertion guide 31 is clamped along the rotation axis Z. The workpiece W is held on the workpiece holder 21 while being pressed against the upper end Wc of the workpiece W set on the workpiece positioning member 26 of the workpiece holder 21. Clamp in position.

  Further, a liquid supply hole 37 having a discharge port 37 a is formed above the ELID electrode 34 of the tool insertion guide body 32, and the liquid supply hole 37 is not shown through a supply passage 6 a formed in the movable member 6. Connected to the conductive liquid supply means.

  A cylindrical insertion guide portion 38 that fits into the upper end portion of the tool insertion guide main body 32 is attached. The insertion guide portion 38 has an annular guide portion 38B in which the outer peripheral surface 38Bb is fitted in the upper portion of the tool insertion guide main body 32, and an introduction portion 38A that expands in a flange shape at the upper end of the guide portion 38B. The inner peripheral surface 38Aa of the introducing portion 38A is formed in a taper shape having a larger diameter as it moves upward, and the inner peripheral surface 38Ba of the guiding portion 38B is continuous with the inner peripheral surface 38Aa of the introducing portion 38A and has an ELID electrode. The electrode surface 34a is formed to have substantially the same diameter. In addition, a notch is formed in the lower portion 38Bc of the outer peripheral surface 38Bb of the guide portion 38B so as to face the liquid supply hole 37a, and the aqueous solution fed from the conductive liquid supply means through the supply passage 6a and the liquid supply hole 37. The coolant can be supplied into the tool insertion guide 31.

  Further, in the state where the honing tool 10 is lowered to the bottom dead center position shown in FIG. 6, the tip side range 20 </ b> A of each honing grindstone 20 shown in FIG. 2 protrudes from the lower end Wc of the work material W and the work material holding portion 21. When the honing tool 10 shown in FIG. 8 is at the top dead center position, the base end side range 20B of each honing grindstone 20 shown in FIG. 2 protrudes from the upper end Wc of the work material W and enters the tool insertion guide 31. In addition, the tip end side range 20A and the base end side range 20B are at the bottom dead center position shown in FIG. 6, and each honing grindstone 20 has a base end side range 20A excluding the overlapping range 20C. 8, each honing grindstone 20 is set so that the tip end side range 20 </ b> A excluding the overlapping range 20 </ b> C is located within the cylindrical inner peripheral surface Wa of the work material W. In other words, the sum of the length in the rotation axis Z direction of the distal end side range 20A and the length in the rotation axis Z direction of the proximal end range 20B is greater than the length in the rotation axis Z direction of the honing grindstone 20 in the rotation axis Z direction of the overlapping range 20C. The length is set larger.

  Next, the operation of the honing apparatus 1 configured as described above will be described with reference to the time chart of the honing cycle shown in FIG.

  The honing tool 10 shown in FIG. 1 is held at the raised position that is the standby position, and the workpiece insertion part 31 disposed on the movable member 6 is raised to the unclamping position, and the workpiece holding part 21 is cut. The lower end Wb of the work material W is fitted and set to the positioning portion 27 formed on the positioning member 26. In this set state, the lower end Wb abuts on the mounting surface 27a and the outer peripheral surface Wd is engaged with the engaging portion 27b, so that the axis of the workpiece W is positioned coaxially with the rotation axis Z.

  Next, the tool insertion guide 31 is lowered from the unclamping position to the clamping position along the rotation axis Z, and the pressing surface 36a of the clamping member 36 is pressed against the upper end Wc of the work material W so as to press the work material holding part 21. Hold the clamp at the set position.

  Subsequently, the aqueous coolant is supplied from the conductive liquid supply means into the tool insertion guide 31 via the supply passage 6 formed in the movable member 6 and the liquid supply hole 37 formed in the tool insertion guide main body 32. Here, the aqueous coolant introduced into the tool insertion guide 31 from the discharge port 37 a of the liquid supply hole 37 is supplied to the electrode surface 34 a of the ELID electrode 34, and further along the cylindrical inner peripheral surface Wa of the work material W. It flows down and is supplied to the electrode surface 24 a of the ELID electrode 24 in the work material holding portion 21.

  On the other hand, the hoisting mechanism of the honing head 2 pulls the first expansion / contraction bar 17A and the second expansion / contraction bar 17B of the honing tool 10 so that the first honing shoe 13A and the second honing shoe 13B approach the rotation axis Z, that is, the contraction. The honing tool 10 moved in the radial direction is lowered along the rotation axis Z. The honing tool 10 that descends is guided by the inner peripheral surfaces 38Aa and 38Ba of the insertion guide portion 38 provided at the upper end of the tool insertion guide 31 and inserted into the tool insertion guide 31, and further the cylindrical inner periphery of the work material W. The front end side range 20A of each honing grindstone 20 protrudes from the lower end Wb of the work material W through the surface Wa and lowers to the bottom dead center position shown in FIG.

  In a state where the honing tool 10 is lowered to the bottom dead center position, the base end side range 20B excluding the overlapping range 20C of each honing grindstone 20 is held in the cylindrical inner surface Wa of the work material W, and the work material is held. The outer surface 20a in the tip range 20A of the honing grindstone 20 that has entered the portion 21 faces the electrode surface 24a of the ELID electrode 24 with an aqueous coolant interposed therebetween.

  Subsequently, from the state in which the housing tool 10 shown in FIG. 6 is at the bottom dead center position, the bottom dead center position shown in FIG. 6 and the bottom dead center position shown in FIG. 8 is reciprocated between the top dead center position shown in FIG. 8 and the traction of the first expansion / contraction bar 17A and the second expansion / contraction bar 17B of the honing tool 10 by the traction operation mechanism is released. By releasing the pulling, the first expansion / contraction bar 17A and the second expansion / contraction bar 17B are moved to the distal end side by the urging force of the spring 18, and the proximal end side tapered surface 17Aa and the distal end side tapered surface 17Ab of the first expansion / contraction bar 17A are respectively The first honing shoe 13A is pressed outwardly in the radial direction away from the rotation axis Z while being pressed against the proximal end side tapered surface 13Aa and the distal end side tapered surface 13Ab of the one honing shoe 13A. Similarly, the proximal end tapered surface 17Ba and the distal end tapered surface 17Bb of the second expansion / contraction bar 17B are in pressure contact with the proximal end tapered surface 13Ba and the distal end tapered surface 13Bb of the second honing shoe 13B, respectively. The outer surface 21 of each honing grindstone 20 comes into contact with the cylindrical inner peripheral surface Wa of the work material W by pushing 13B in the diameter increasing direction away from the rotation axis Z. And the cylindrical inner peripheral surface Wa of the work material W is ground by the honing grindstone 20 with a preset contact pressure, that is, honing is started.

  While performing honing, a gap between the outer peripheral surface 16a of the honing guide member 16 and the cylindrical inner peripheral surface Wa serving as the processing surface is detected by an air micrometer, and the outer peripheral surface 16a of the honing guide member 16 and the inner peripheral surface of the workpiece W are detected. When the gap with the surface Wa reaches a predetermined value, the first expansion / contraction bar 17A and the second expansion / contraction bar 17B are pulled upward by the traction operation mechanism, and the proximal end side taper surface 17Aa and the distal end side taper surface of the first expansion / contraction bar 17A. The second honing shoe by the proximal end taper surface 17Ba and the distal end side taper surface 17Bb of the second expansion / contraction bar 17B is released while releasing the pressure on the proximal end side taper surface 13Aa and the distal end side taper surface 13Ab of the first honing shoe 13A by 17Ab. The pressing of the proximal end side tapered surface 13Ba and the distal end side tapered surface 13Bb of 13B is released. As a result, the first honing shoe 13A and the second honing shoe 13B are moved in the direction approaching the rotation axis Z by the spring bands 14a and 14b, that is, the diameter reducing direction, so that each honing grindstone 20 is a cylinder of the work material W. The honing is finished away from the inner circumferential surface Wa. The machining time is from the start of the honing process to the end of the honing process.

  In this honing process, the honing tool 10 is positioned at the bottom dead center position where the front end side range 20A of each honing grindstone 20 of the honing tool 10 protrudes from the lower end Wb of the work material W and enters the main body 22 of the work material holding part 21. Is moved, the distal end side range 20A enters the workpiece holding body 22 and the outer surface 20a of the honing grindstone 20 in the distal end range 20A and the electrode surface 24a of the ELID electrode 24 face each other. A negative voltage is applied from the voltage application means to the ELID electrode 24 for a preset time in the state, and a positive voltage is applied to each honing grindstone 20 by the voltage application means, and the tip side of each honing grindstone 20 by electrolytic action The electroconductive dressing of the outer surface 20a in the range 20A is electrolyzed and electrolytic dressed. In this electrolytic dressing, the state in which the outer surface 20a of the proximal end side range 20B of each honing grindstone 20 is pressed against the cylindrical inner peripheral surface Wa of the work material W is maintained, and the outer surface of each honing grindstone 20 with respect to the rotation axis Z is maintained. The surface 20a and the roundness are secured, the gap between the outer surface 20a of each honing grindstone 20 and the electrode surface 24a of the ELID electrode 24 is kept uniform, and the electrode surface 24a of the ELID electrode 24 and the honing grindstone 20 A stable electrolytic dressing can be obtained because the aqueous coolant interposed between the outer surface 21 in the distal end range 20A is excellent in conductivity. Moreover, the protrusion amount of the abrasive grains can be optimized by the electrolytic voltage and the electrolytic dressing time. In particular, since the ELID electrode 24 is cylindrical and the electrolytic dressing is performed during the honing process and the honing tool 10 is rotated and moved in the direction of the rotation axis Z, the outer surface 20a in the tip side range 20A of each honing grindstone 20 is obtained. A homogeneous electrolytic dressing is performed throughout.

  Similarly, the top dead center where the proximal end side range 20B of each honing grindstone 20 of each honing tool 10 in this honing process protrudes from the upper end Wc of the work material W and enters the tool insertion guide main body 32 of the tool insertion guide 31. Each time the honing tool 10 moves to the position, the proximal end range 20B enters the tool insertion guide main body 32 and the outer surface 20a in the proximal end range 20B of the honing grindstone 20 and the electrode surface 34a of the ELID electrode 34. And a negative voltage is applied from the voltage application means to the ELID electrode 34 for a preset time in a state of facing each other, a positive voltage is applied to each honing grindstone 20 by the voltage application means, Electroconductive dressing is performed by electrolyzing the conductive joint portion of the outer surface 20a in the base end side range 20B of the honing grindstone 20. In this electrolytic dressing, the state where the outer surface 20a of the tip side range 20A of each honing grindstone 20 is pressed against the cylindrical inner peripheral surface Wa of the work material W is maintained, and the outer surface 20a of each honing grindstone 20 with respect to the rotation axis Z is maintained. In addition, the roundness is ensured so that the gap between the outer surface 20a of each honing grindstone 20 and the electrode surface 34a of the ELID electrode 34 is uniformly maintained, and the electrode surface 34a of the ELID electrode 34 and the proximal end of the honing grindstone 20 Since the aqueous coolant interposed between the outer surface 20a in the side range 20B is excellent in conductivity, a stable electrolytic dressing can be obtained. Moreover, the protrusion amount of the abrasive grains can be optimized by the electrolytic voltage and the electrolytic dressing time. In particular, since the ELID electrode 24 is cylindrical and the electrolytic dressing is performed during the honing process and the honing tool 10 is rotated and moved in the direction of the rotation axis Z, the outer surface 20a in the proximal end range 20B of each honing grindstone 20 is obtained. A homogeneous electrolytic dressing is performed over the entire area.

  The electrolytic dressing time and the applied voltage are determined by the abrasive grain protrusion amount, the material of the conductive coupling portion, and the like, but an arbitrary time and applied voltage can be appropriately set by experiment, simulation, or the like.

  When the honing process is finished, the rotation of the honing tool 10 and the reciprocation in the direction of the rotation axis Z are stopped, the supply of aqueous coolant from the conductive liquid supply means is stopped, the honing tool 10 is raised and stopped at the standby position. . Then, the tool insertion guide 31 is raised from the clamp position to the unclamp position along the rotation axis Z, and the pressing surface 36a of the clamp member 36 is separated from the upper end Wc of the work material W to unclamp the work material holding portion 21. Clamping is performed, and the processed workpiece W is carried out from the workpiece positioning member 26 of the workpiece holder 21. By repeating the steps from loading to unloading of the work material W, honing can be performed on the cylindrical inner peripheral surface Wa of the work material W sequentially.

  Therefore, according to the present embodiment, the cylindrical inner peripheral surface Wa serving as a cutting portion is formed between the work material holding portion 21 provided with the ELID electrode 24 and the tool insertion guide 31 provided with the ELID electrode 34. The honing tool 10 having the honing grindstone 20 is reciprocated between the bottom dead center position of the work material holding portion 21 and the top dead center position on the tool insertion guide 31 side. When honing the cylindrical inner peripheral surface Wa of the work material W, the honing grindstone 20 is subjected to electrolytic dressing using aqueous coolant in the work material holding portion 21 in which the ELID electrode 24 is disposed, and ELID In the tool insertion guide 31 in which the electrode 34 is disposed, the honing grindstone 20 is electrolytically dressed using an aqueous coolant. No variation stable honing quality of surface roughness is possible that.

  Further, the honing tool 10 having the honing grindstone 20 is reciprocated between the bottom dead center position of the work material holding portion 21 and the top dead center position on the tool insertion guide 31 side, and the cylindrical inner peripheral surface of the work material W When honing the Wa, the honing grindstone 20 is subjected to electrolytic dressing in the work material holding portion 21 in which the ELID electrode 24 is disposed and the tool insertion guide 31 in which the ELID electrode 34 is disposed. Electrolytic dressing is possible without affecting the processing time, and work efficiency is improved. Moreover, it is not necessary to remove the honing tool for dressing the conventional troublesome honing wheel.

  Furthermore, since the ELID electrodes 24 and 34 are disposed in the work material holding portion 21 and the tool insertion guide 31, it is not necessary to newly provide electrolytic dressing means, and can be realized without greatly changing the existing honing apparatus. Reduction of manufacturing costs can be expected without complicating the apparatus and work.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention. For example, in the above-described embodiment, the bottom dead center position or the top dead center position where the distal end side range 20A or the proximal end side range of the honing grindstone 20 of the honing tool 10 in the honing process protrudes from the lower end Wb or the upper end Wc of the work material W. Although the example in which the electrolytic dressing is applied to the honing grindstone 20 every time it is moved to has been described, the electrolytic dressing can also be applied every time it moves to a preset bottom dead center position or top dead center position.

  In the above embodiment, the cylindrical ELID electrode 24 is disposed on the inner periphery 23a of the insulating member 23 of the work material holding portion 21, but the work corresponding to the cross section taken along the line XX of FIG. As shown in a cross-sectional view of the material holding portion 21, a plurality of electrode holding grooves 23c having an arcuate cross section continuous in the rotation axis Z direction are formed at equal intervals on the inner periphery 23a of the insulating member 23, and each electrode holding groove 23c has a cross section. The electrode surface 24Aa of the ELID electrode 24A formed in an arc shape may be exposed from the inner periphery 23a and may be arranged radially around the rotation axis Z. Similarly, although not shown in the drawings, a plurality of electrode holding grooves having a circular arc cross section are formed at equal intervals on the inner periphery 33a of the insulating member 33 of the tool insertion guide 31, and the electrode for ELID formed in a circular arc shape in each electrode holding groove. Can be arranged radially about the rotation axis Z.

  Also, for example, depending on the shape of the work material W, the shape of the work material holding part main body or the like is changed in order to avoid contact between the work material and the work material holding part main body of the work material holding part. For example, as shown in FIG. 11 which is a cross-sectional view of the work material holding portion 21 corresponding to the cross section taken along the line XX of FIG. For ELID divided into arc-shaped work material holding part main bodies 22A, 22A and formed in an arc shape in cross section with insulating members 23A, 23A on inner circumferences 22Aa, 22Aa of the work material holding part main bodies 22A, 22A It is also possible to arrange the electrodes 24B radially about the rotation axis Z. Similarly, although not shown, the tool insertion guide body 32 of the tool insertion guide 31 is divided into tool insertion guide bodies having a circular arc cross section, and an insulating member is interposed on the inner periphery of each of the divided tool insertion guide bodies. It is also possible to dispose an ELID electrode formed in an arc shape.

  12 shows a cross-sectional view of the work material holding portion 21 corresponding to the cross section taken along line XX in FIG. It is also possible to form the ELID electrode 24C formed in the cutting material holding part main body 22B and having an arcuate cross section with the insulating member 23B interposed on the inner periphery 22Ba of the work material holding part main body 22B. Similarly, although not shown in the drawings, the tool insertion guide body 32 of the tool insertion guide 31 is formed in a tool insertion guide body having an arcuate cross section, and an arcuate section is formed on the inner periphery of the tool insertion guide body with an insulating member interposed. It is also possible to dispose an ELID electrode.

  In the above embodiment, the aqueous coolant from the conductive liquid supply means is supplied to the tool insertion guide. However, the aqueous coolant from the conductive liquid supply means can also be supplied into the work material holder 21.

  In the above description, the case where the rotation axis Z extends vertically has been described. However, the rotation axis Z can be inclined or can be extended horizontally as required.

It is explanatory drawing of the honing apparatus which concerns on embodiment of this invention. FIG. 2 is a configuration diagram of the honing tool. FIG. 3 is a view taken in the direction of arrow III in FIG. 2. FIG. 4 is an enlarged view of a portion IV in FIG. 1, and is a cross-sectional view of a work material holding portion provided with an electrode for electrolytic dressing. FIG. 2 is an enlarged view of a portion V in FIG. 1, and is a cross-sectional view of a tool insertion guide provided with an electrode for electrolytic dressing. It is a figure which shows the outline | summary of an electrolytic dressing state. It is a figure which shows the outline | summary of a honing process state. It is a figure which shows the outline | summary of an electrolytic dressing state. It is a time chart of a honing process cycle. It is sectional drawing of the work material holding | maintenance part by which the electrode for electrolytic dressing of the cross-section arc shape was arrange | positioned. It is sectional drawing of the work material holding part divided into two. It is sectional drawing of an arc-shaped workpiece holding part. It is a schematic diagram of the electrolytic dressing means of the conventional honing grindstone.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Honing apparatus 2 Honing head 10 Honing tool 20 Honing grindstone 20a Outer surface 20A Tip side area | region 20B Base end side area | region 20C Overlapping area | region 21 Workpiece material holding part (1st electrolytic dressing means)
22 Workpiece material holding body 23 Insulating member 24 Electrolytic dressing electrode (first electrolytic dressing electrode, ELID electrode)
24a Electrode surface 31 Tool insertion guide (second electrolytic dressing means)
32 Tool insertion guide body 33 Insulating member 34 Electrode dressing electrode (second electrolytic dressing electrode, ELID electrode)
34a Electrode surface Z Rotating shaft W Work material Wa Cylindrical inner peripheral surface (cutting part)
Wb Lower end (one end)
Wc Upper end (other end)

Claims (14)

A honing tool in which a plurality of honing grindstones in which abrasive grains are fixed by a conductive coupling portion from the front end to the base end is radially arranged is inserted into a cylindrical inner peripheral surface penetrating the work material along the rotation axis direction. Then, while rotating the honing tool, the bottom dead center position where the front end side range of the honing grindstone protrudes from one end of the work material and the base end side range of the honing grindstone protrudes from the other end of the work material. In the honing device for the cylindrical inner peripheral surface that reciprocates in the direction of the rotation axis between the top dead center position and honing the cylindrical inner peripheral surface,
For the first electrolytic dressing, the electrode surface is opposed to the outer surface of the honing grindstone protruding from one end of the work material on one end side of the work material with a gap interposing the conductive grinding fluid interposed therebetween. A first electrolytic dressing means comprising a voltage applying means for applying a voltage to the electrode and the honing grindstone and the first electrode for electrolytic dressing;
On the other end side of the work material, the electrode surface is opposed to the outer surface in the base end side range of the honing grindstone protruding from the other end of the work material with a gap interposing the conductive grinding fluid. An electrode for electrolytic dressing, the honing grindstone, and a second electrolytic dressing means including a voltage applying means for applying a voltage to the second electrode for electrolytic dressing,
The honing grindstone and the first electrolytic dressing electrode in the presence of a conductive grinding fluid between the outer surface of the honing grindstone protruding from one end of the work material and the first electrolytic dressing electrode. Apply a voltage to the tip of the honing grindstone and perform electrolytic dressing.
The honing grindstone and the second electrolytic dressing in the presence of a conductive grinding liquid between the outer surface in the proximal end range of the honing grindstone protruding from the other end of the work material and the second electrode for electrolytic dressing A honing device for an inner circumferential surface of a cylinder, wherein a voltage is applied to an electrode for electrolytic dressing of a base end side range of the honing grindstone.   The sum of the length in the rotation axis direction of the distal end side range of the honing grindstone protruding from one end of the work material and the length in the rotation axis direction of the proximal end range of the honing grindstone protruding from the other end of the work material 2. The honing device for a cylindrical inner peripheral surface according to claim 1, wherein a length of the honing grindstone is larger than a length in a rotation axis direction of the honing grindstone.   The first electrode for electrolytic dressing has a cylindrical shape in which the outer surface and the electrode surface in the tip side range of the honing grindstone protruding from one end of the work material are opposed to each other and extend in the rotation axis direction of the honing tool. The honing apparatus for a cylindrical inner peripheral surface according to claim 1 or 2.   The electrode for the first electrolytic dressing has a cross-sectional arc shape in which the outer surface and the electrode surface of the honing grindstone protruding from one end of the work material are opposed to each other and extend in the rotation axis direction of the honing tool. The honing device for a cylindrical inner peripheral surface according to claim 1, wherein the honing device is provided. A honing tool in which a plurality of honing grindstones in which abrasive grains are fixed by a conductive coupling portion from the distal end to the base end is radially arranged along the rotation axis direction, with one end held by the work material holding portion. A tool insertion guide disposed on the other end side of the work material is inserted into a cylindrical inner peripheral surface that penetrates the work material, and the honing tool is rotated from one end of the work material while rotating the honing tool. The cylinder is reciprocated in the direction of the rotation axis between a bottom dead center position at which the tip end range of the grindstone protrudes and a top dead center position at which the base end side range of the honing grindstone projects from the other end of the work material. In a honing device for a cylindrical inner peripheral surface for honing the inner peripheral surface,
The work material holding part is
The electrode surface is opposed to the outer surface of the honing grindstone, which is disposed on the inner peripheral surface of the work material holding portion main body and protrudes from one end of the work material, with a gap through which the conductive grinding fluid is interposed. A first electrode for electrolytic dressing;
A voltage applying means for applying a voltage to the honing grindstone and the first electrode for electrolytic dressing;
The tool insertion guide is
The electrode surface is opposed to the outer surface of the honing grindstone that is disposed on the inner peripheral surface of the tool insertion guide main body and protrudes from the other end of the work material with a gap through which the conductive grinding fluid is interposed. A second electrode dressing electrode;
Voltage application means for applying a voltage to the honing grindstone and the second electrode for electrolytic dressing;
The honing grindstone and the first electrolytic lessing electrode in the presence of a conductive grinding liquid between the outer surface of the honing grindstone protruding from one end of the work material and the first electrolytic dressing electrode. Apply a voltage to the tip of the honing grindstone and perform electrolytic dressing.
The honing grindstone and the second electrolytic dressing in the presence of a conductive grinding liquid between the outer surface in the proximal end range of the honing grindstone protruding from the other end of the work material and the second electrode for electrolytic dressing A honing device for an inner circumferential surface of a cylinder, wherein a voltage is applied to an electrode for electrolytic dressing of a base end side range of the honing grindstone.   The length in the rotation axis direction of the tip side range of the honing grindstone protruding from one end of the work material and the length in the rotation axis direction of the base end side range of the honing grindstone protruding from the other end side of the work material The total length is larger than the length of the said honing grindstone in the rotating shaft direction, The honing apparatus of the cylinder internal peripheral surface of Claim 5 characterized by the above-mentioned. The first electrode for electrolytic dressing is
The outer surface of the honing grindstone that is disposed on the inner peripheral surface of the work material holding portion main body and protrudes from one end of the work material faces the electrode surface and extends in the direction of the rotation axis of the honing tool. The honing device for a cylindrical inner peripheral surface according to claim 5 or 6, wherein the honing device is cylindrical. The first electrode for electrolytic dressing is
A plurality of circumferentially spaced inner circumferential surfaces of the work material holder main body, each of which protrudes from one end of the work material. The honing device for a cylindrical inner peripheral surface according to claim 5 or 6, wherein the honing device has a circular arc shape extending in the axial direction. The work material holding part is
A plurality of the work material holding part main bodies divided in the circumferential direction are provided,
The first electrolytic dressing electrode is disposed on the inner periphery of each work material holding portion main body, and the electrode surface is opposed to the outer surface in the tip side range of the honing grindstone protruding from one end of the work material. The honing device for a cylindrical inner peripheral surface according to claim 5 or 6, wherein the honing device has an arcuate cross section extending in a cylindrical shape.   The honing apparatus for a cylindrical inner peripheral surface according to any one of claims 5 to 9, wherein an insulating member is interposed between the work material holding part main body and the first electrode for electrolytic dressing.   The honing apparatus for a cylindrical inner peripheral surface according to any one of claims 5 to 10, wherein an insulating member is interposed between the tool insertion guide main body and the second electrode for electrolytic dressing. A honing tool in which a plurality of honing grindstones in which abrasive grains are fixed by a conductive coupling portion from the front end to the base end is radially arranged is inserted into a cylindrical inner peripheral surface penetrating the work material along the rotation axis direction. Then, while rotating the honing tool, the bottom dead center position where the front end side range of the honing grindstone protrudes from one end of the work material and the base end side range of the honing grindstone protrudes from the other end of the work material. In the honing method of the cylindrical inner peripheral surface that reciprocates in the direction of the rotation axis between the top dead center position and honing the cylindrical inner peripheral surface,
For the first electrolytic dressing, the electrode surface is opposed to the outer surface of the honing grindstone protruding from one end of the work material on one end side of the work material with a gap interposing the conductive grinding fluid interposed therebetween. A first electrolytic dressing means comprising a voltage applying means for applying a voltage to the electrode and the honing grindstone and the first electrode for electrolytic dressing;
On the other end side of the work material, the electrode surface is opposed to the outer surface in the base end side range of the honing grindstone protruding from the other end of the work material with a gap interposing the conductive grinding fluid. An electrolytic dressing electrode, the honing grindstone, and a second electrolytic dressing means including a voltage applying means for applying a voltage to the second electrolytic dressing electrode,
In the honing process, the outer surface of the honing grindstone that protrudes from one end of the workpiece facing when the honing grindstone protrudes from the one end of the work material and the first electrolytic dressing Applying a voltage to the honing grindstone and the first electrode for electrolytic dressing in the presence of a conductive grinding fluid between the electrodes and electrolytic dressing the tip side range of the honing grindstone;
An outer surface in the proximal end range of the honing grindstone that protrudes from the other end of the work material when the proximal end range of the honing grindstone projects from the other end of the work material; and a second electrode for electrolytic dressing And applying a voltage to the honing grindstone and the second electrode for electrolytic dressing in the presence of a conductive grinding fluid between the electrodes to electrolytically dress the base end side range of the honing grindstone. Honing method. A honing tool in which a plurality of honing grindstones in which abrasive grains are fixed by a conductive coupling portion from the distal end to the base end is radially arranged along the rotation axis direction, with one end held by the work material holding portion. A tool insertion guide disposed on the other end side of the work material is inserted into a cylindrical inner peripheral surface that penetrates the work material, and the honing tool is rotated from one end of the work material while rotating the honing tool. The cylinder is reciprocated in the direction of the rotation axis between a bottom dead center position at which the tip end range of the grindstone protrudes and a top dead center position at which the base end side range of the honing grindstone projects from the other end of the work material. In the honing method of the cylindrical inner peripheral surface for honing the inner peripheral surface,
The work material holding part is
The electrode surface is opposed to the outer surface of the honing grindstone that is disposed on the inner periphery of the work material holder main body and projects from one end of the work material with a gap through which the conductive grinding fluid is interposed. 1 electrode for electrolytic dressing;
A voltage applying means for applying a voltage to the honing grindstone and the first electrode for electrolytic dressing;
The tool insertion guide is
The electrode surface is opposed to the outer surface of the honing grindstone located on the inner periphery of the tool insertion guide main body and protruding from the other end of the work material with a gap through which the conductive grinding fluid is interposed. Two electrode dressing electrodes;
Voltage application means for applying a voltage to the honing grindstone and the second electrode for electrolytic dressing;
In the honing process, the outer surface of the honing grindstone that protrudes from one end of the workpiece facing when the honing grindstone protrudes from the one end of the work material and the first electrolytic dressing Applying a voltage to the honing grindstone and the first electrolytic lessening electrode in the presence of a conductive grinding fluid between the electrodes and electrolytic dressing the tip-side area of the honing grindstone;
When the proximal end side range of the honing grindstone protrudes from the other end of the work material, the outer surface of the honing grindstone protruding from the other end of the work material and the second electrode for electrolytic dressing Honing the inner peripheral surface of a cylinder, characterized in that a voltage is applied to the honing grindstone and the second electrode for electrolytic dressing in the presence of a conductive grinding fluid between them to electrolytically dress the proximal end side range of the honing grindstone Method.   The sum of the length in the rotation axis direction of the distal end side range of the honing grindstone protruding from one end of the work material and the length in the rotation axis direction of the proximal end range of the honing grindstone protruding from the other end of the work material 14. The honing method for a cylindrical inner peripheral surface according to claim 12, wherein the length is larger than the length of the honing grindstone in the rotation axis direction.

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