JP2015009292A - Fine hole electric discharge machining device, and fine hole electric discharge machining method using the machining device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fine hole electric discharge machining device and a fine hole electric discharge machining method using this machining device, for machining a blind hole opened to a cylindrical body inner space in a short time, without being limited depending on a thickness and a width of a cylindrical body.SOLUTION: In a fine hole electric discharge machining device, a Z axis slide 19 for freely positioning in the vertical direction is provided on a slide base 15, an electrode holder for holding an upper part of a rod-like or pipe-shaped electrode 31 is provided in rotation-driven manner in the Z axis slide, and electrode guide means for guiding a lower part of the electrode is provided on the slide base. In the fine hole electric discharge machining device, the electrode guide means is provided with a guide arm 37 for extending to a Z axis lower part from a slide base lower end part, and is provided with a first straight guide 39 for making the electrode advance straight to the lower end part vicinity of the guide arm, and electrode deflection means 41 for deflecting the advance direction of the electrode to the side direction from the Z axis direction, is provided under the first straight guide.

Description

  The present invention relates to a fine hole electric discharge machining apparatus and a fine hole electric discharge machining method using the same apparatus.

  Conventionally, for example, processing of a sensor mounting hole for mounting a temperature sensor in the longitudinal center of a cylindrical rolling roll has been performed by drilling using a drilling machine from the side of the rolling roll 101 as shown in FIG. .

  However, in drilling from the side surface of the rolling roll 101, as the width L of the rolling roll 101 increases, the distance L / 2 from the sensor mounting hole 103 to the center of the rolling roll becomes longer, so that the processing time becomes longer. There is.

  Further, since deep hole drilling is difficult, the width of the rolling roll having the sensor mounting hole is regulated by the length of the long hole that can be drilled.

  Furthermore, since drilling is performed from the side surface of the rolling roll, the thickness t of the rolling roll 101 cannot be reduced. As a result, there is also a problem that the diameter of the rolling roll 101 is increased and the weight is increased.

  Further, in Patent Document 1, although the sensor mounting hole in the rolling roll is not processed, the existing storage hole (11) is used for the fuel return hole (12) of the injector (fuel injection device) for the diesel engine. An electric discharge machining method and apparatus for machining a straight lateral hole (13) communicating from the storage hole (11) to the fuel return hole (12) is described.

  The electrode (2) in the electric discharge machining apparatus described above is composed of a plurality of components. That is, the electrode (2) is formed in a hemispherical cup shape made of a conductive material, and the tip of a coil spring (3) tightly wound on the hemispherical cup-shaped electrode (2) is connected to the joint (6). And a cylindrical support (4) made of a conductive material at the rear end of the coil spring (3).

  As can be understood from the configuration of the electrode (2), the outer diameter of the coil spring is necessarily larger than the diameter of the wire used for the spring. The diameter of the electrode (2) is substantially equal to the outer diameter of the coil spring (3) wound tightly. Therefore, in the method according to the invention described in Patent Document 1, it is not possible to perform fine hole machining using a small-diameter pipe or rod-like electrode as in the fine hole electric discharge machining apparatus of the present invention.

JP 2008-302461 A

  The present invention has been made to solve the above-described problems, and an object of the present invention is to open to the cylinder space without being restricted by the thickness or width of the cylinder as a workpiece. It is an object of the present invention to provide a fine hole electric discharge machining apparatus that can process a blind hole in a short time and a fine hole electric discharge machining method using the apparatus.

  As a means for solving the above-described problem, the thin hole electric discharge machining apparatus according to claim 1 is provided with a Z-axis slide which can be positioned in a vertical direction on a slide base, and holds an upper portion of a rod-shaped or pipe-shaped electrode on the Z-axis slide. In the thin hole electric discharge machining apparatus in which the electrode holder for rotating is provided so as to be rotatable, and the electrode guide means for guiding the lower part of the electrode to the slide base is provided, the electrode guide means is moved downward from the lower end portion of the slide base in the Z-axis direction. An extending guide arm is provided, and a first straight guide is provided in the vicinity of the lower end portion of the guide arm to move the electrode straight, and the traveling direction of the electrode is shifted from the Z-axis direction to the side below the first straight guide. An electrode deflecting means for deflecting is provided.

  The thin hole electric discharge machining apparatus according to claim 2 is the thin hole electric discharge machining apparatus according to claim 1, wherein the electrode deflection unit is connected to the R guide member that bends the electrode in a curved shape. And an electrode bent by the R guide member is deflected laterally from the Z-axis direction by the second straight guide.

  The fine hole electric discharge machining method according to claim 3 uses the fine hole electric discharge machining apparatus according to claim 1 or 2, inserts and positions the guide arm into an internal space of a cylindrical body as a workpiece, A blind hole that opens to the space inside the cylinder is processed in the cylinder that is the workpiece by the electrode deflected by the electrode deflection means.

  According to the present invention, a thin hole electric discharge machining apparatus capable of processing a blind hole opened to a cylindrical space in a short time without being restricted by the thickness or width of the cylindrical body as a workpiece, and the same A fine hole electric discharge machining method using the apparatus can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS Whole explanatory drawing of the 1st Example of the fine hole electric discharge machining apparatus concerning this invention. It is P section enlarged view of FIG. 1, and explanatory drawing of the blind hole processing from a cylinder. The front view of the electrode deflection | deviation means part in an electrode guide. AA sectional drawing in FIG. BB sectional drawing in FIG. The 2nd Example (front view) of the fine hole electric discharge machining apparatus which concerns on this invention. The Q section enlarged view in FIG. The top view in FIG. Explanatory drawing of the blind hole processing from the conventional cylinder.

  Embodiments of the present invention will be described below with reference to the drawings.

  Referring to FIG. 1, a Y-axis carriage 5 that can be moved and positioned in the Y direction (left-right direction in FIG. 1) by a Y-axis motor 4 is provided on a base 3 of the narrow hole electric discharge machining apparatus 1.

  A processing tank 7 is provided on the Y-axis carriage 5 to accommodate a cylindrical work W. A fixing jig 8 for fixing the work W vertically in the processing tank 7 is installed on the work table 9. It is. On the base 3 behind the Y-axis carriage 5 (to the right in FIG. 2), a pair of columns 11 spaced in the X direction (a direction perpendicular to the Y direction) is erected.

  An X-axis carriage 13 that can be moved and positioned in the X direction by an X-axis motor (not shown) is provided on the column 11. A slide base 15 is engaged in front of the X-axis carriage 13 so as to be movable up and down.

  The slide base 15 is provided with a Z-axis slide 19 that can be moved and positioned in the vertical direction (Z-axis direction) by a Z-axis motor 17.

  Therefore, the Z-axis slide 19 can be moved to a desired position in the Z direction by appropriately rotating and driving the Z-axis motor 17 under the control of a control device (not shown).

  An electrode holder 27 is rotatably provided below the Z-axis slide 19. The configuration of the electrode holder 27 is the same as that described in the specification of Japanese Patent Application Laid-Open No. 2001-287119 filed by the applicant of the present application, and its outline will be described below.

  The electrode holder 27 described above is detachably provided under the Z-axis slide 19 via a known one-touch coupler, and is provided so as to be rotationally driven by an electrode motor 29.

  The electrode holder 27 includes a collet chuck that holds an upper portion of the rod-shaped or pipe-shaped electrode 31, a jet nozzle that jets water supplied from a water supply device (not shown) so as to surround the rod-shaped electrode or the pipe-shaped electrode 31, etc. Is provided.

  In the above configuration, the tip of the rod-shaped electrode or pipe-shaped electrode 31 is appropriately moved and positioned with respect to the X-axis carriage 13, the Y-axis carriage 5, and the Z-axis slide 19 under the control of a control device (not shown). Can be moved and positioned to the machining position of the cylindrical workpiece W.

  Referring to FIGS. 1 and 2, an electrode guide means 35 for guiding a lower portion of the electrode 31 is provided on a support plate 33 provided integrally with a lower end portion of the slide base 15.

  The electrode guide means 35 includes a guide arm 37 that extends downward from the lower end of the slide base 15 in the Z-axis direction and can enter the cylinder of the cylindrical workpiece W.

  As shown in FIGS. 3 and 4, a hole that is slightly larger than the diameter of the electrode 31 is provided in the center of the guide arm 37, and in the vicinity of the lower end portion of the guide arm 37, a guide for linearly guiding the electrode 31 is provided. One straight guide 39 is provided.

  Below this first straight guide 39, there is provided an electrode deflection means 41 for deflecting the traveling direction of the electrode 31 from the Z-axis direction to the side.

  The electrode deflecting means 41 includes an R guide member 43 that bends the electrode 31 in a curved shape, and a second straight guide 45 that is connected to the R guide member 43.

  As shown in FIGS. 3 to 5, the R guide member 43 includes a first straight guide 39 fixed near the lower end portion of the guide arm 37 and a second straight guide fixed to the lower end portion of the guide arm 37. 45, the outlet of the first straight guide 39 and the inlet of the second straight guide 45 are connected by an arcuate electrode guide groove 47.

  As shown in FIG. 5, the R guide member 43 is detachably attached by a bolt 51 to a notch 49 provided between the first straight guide 39 and the second straight guide 45 of the guide arm 37. is there. The mounting position of the R guide member 43 is accurately held by the knock pin 53.

  The cross-sectional shape of the R guide member 43 is a shape obtained by cutting and removing a portion above the center of the circle into an arcuate shape, and when the R guide member 43 is attached to the notch 49, the outer periphery thereof is the guide. The arm 37 is manufactured to have the same circular shape as the outer diameter of the lower end portion.

  According to the fine hole electric discharge machining apparatus having the above-described configuration and the fine hole electric discharge machining method using the same apparatus, the blind hole that opens to the space inside the cylinder without being restricted by the thickness or width of the cylinder that is the workpiece Can be processed in a short time.

  6 to 8 show a second embodiment of the small hole electric discharge machining apparatus according to the present invention, FIG. 6 is a front view, FIG. 7 is an enlarged view of a portion Q in FIG. 6, and FIG. Components having the same functions as those of the first embodiment are given the same reference numerals.

  An X-axis carriage 63 driven by an X-axis motor (not shown) is provided on the machine base 61 of the small hole electric discharge machining apparatus 60. A work table 65 that horizontally supports a long cylindrical work W is provided adjacent to the machine base 61.

  The X-axis carriage 63 is provided with a guide arm 67 capable of entering the cylinder of a horizontally supported cylindrical workpiece W so as to be movable and positionable in the X-axis direction.

  The guide arm 67 is provided with an electrode holder 27 that holds the left end of the rod-like or pipe-like electrode 31.

  The guide arm 67 is provided with a guide pipe 69 for horizontally and linearly guiding the electrode 31 extending rightward from the electrode holder 27.

  An electrode deflection means 71 is provided at the right end of the guide pipe 69 to deflect the traveling direction of the tip of the electrode from the X-axis direction to the side.

  The electrode deflecting means 71 includes an R guide member 73 that bends the electrode 31 in a curved shape and a straight guide 75 that is connected to the R guide portion.

  Since the thin hole electric discharge machining apparatus 60 having the above configuration can process a cylindrical workpiece W placed horizontally, the long cylindrical workpiece W is not restricted by the thickness or width of the cylindrical body. The blind hole that opens into the cylindrical space can be processed in a short time.

DESCRIPTION OF SYMBOLS 1 Thin hole electrical discharge machining apparatus 3 Base 4 Y-axis motor 5 Y-axis carriage 7 Processing tank 8 Fixing jig 9 Worktable 11 Column 13 X-axis carriage 15 Slide base 17 Z-axis motor 19 Z-axis slide 27 Electrode holder 29 Electrode motor 31 Rod-shaped or pipe-shaped electrode 33 Support plate 35 Electrode guide means 37 Guide arm 39 First straight guide 41 Electrode deflection means 43 R guide member 45 Second straight guide 47 Electrode guide groove 49 Notch 51 Bolt 53 Knock pin 60 Fine Hole EDM 61 Machine base 63 X-axis carriage 65 Work table 67 Guide arm 69 Guide pipe 71 Electrode deflection means 73 R guide member 75 Straight guide 101 Rolling roll 103 Sensor mounting hole W Workpiece

Claims (3)

A Z-axis slide that can be positioned in the vertical direction is provided on the slide base, and an electrode holder that holds the upper part of the rod-shaped or pipe-shaped electrode is rotatably provided on the Z-axis slide, and the lower part of the electrode is guided to the slide base. In the narrow hole electric discharge machining apparatus provided with the electrode guide means for performing the operation, the electrode guide means is provided with a guide arm extending downward from the lower end of the slide base in the Z-axis direction, and the electrode is moved straight in the vicinity of the lower end of the guide arm. 1. A thin hole electric discharge machining apparatus comprising an electrode deflecting unit that includes one straight guide and deflects the traveling direction of the electrode from the Z-axis direction to the side under the first straight guide. 2. The thin hole electric discharge machining apparatus according to claim 1, wherein the electrode deflection unit includes an R guide member that bends the electrode in a curved shape, and a second straight guide that is connected to the R guide member. A thin hole electric discharge machining apparatus characterized in that an electrode bent by a member is deflected laterally from the Z-axis direction by the second straight guide. The thin hole electric discharge machining apparatus according to claim 1 or 2, wherein the guide arm is inserted and positioned in an internal space of a cylindrical body as a workpiece, and the workpiece is processed by an electrode deflected by the electrode deflection means. A thin hole electric discharge machining method characterized in that a blind hole that opens into a cylindrical space is machined in a cylindrical body that is a material.

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