WO2004052579A1 - Electrode pour usinage par decharge electrique et machine a decharge electrique pour procede de laminage et d'usinage - Google Patents

Electrode pour usinage par decharge electrique et machine a decharge electrique pour procede de laminage et d'usinage Download PDF

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Publication number
WO2004052579A1
WO2004052579A1 PCT/JP2002/012808 JP0212808W WO2004052579A1 WO 2004052579 A1 WO2004052579 A1 WO 2004052579A1 JP 0212808 W JP0212808 W JP 0212808W WO 2004052579 A1 WO2004052579 A1 WO 2004052579A1
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WO
WIPO (PCT)
Prior art keywords
roll
electrode
electric discharge
machining
discharge machining
Prior art date
Application number
PCT/JP2002/012808
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English (en)
Japanese (ja)
Inventor
Toshitsugu Okada
Original Assignee
Sumitomo Metal Industries, Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sumitomo Metal Industries, Ltd. filed Critical Sumitomo Metal Industries, Ltd.
Priority to AU2002354436A priority Critical patent/AU2002354436A1/en
Priority to CNB028299876A priority patent/CN100404183C/zh
Priority to PCT/JP2002/012808 priority patent/WO2004052579A1/fr
Publication of WO2004052579A1 publication Critical patent/WO2004052579A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H1/00—Electrical discharge machining, i.e. removing metal with a series of rapidly recurring electrical discharges between an electrode and a workpiece in the presence of a fluid dielectric
    • B23H1/04—Electrodes specially adapted therefor or their manufacture
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H9/00—Machining specially adapted for treating particular metal objects or for obtaining special effects or results on metal objects
    • B23H9/04—Treating surfaces of rolls

Definitions

  • the present invention relates to an electrode for electric discharge machining provided with a bore for allowing a machining fluid to flow out from the inside of the electrode, and an electric discharge machine for a roll provided with this electrode.
  • This electric discharge machine is suitable for electric discharge machining of rolls such as rolls for dull finishing.
  • the present invention also relates to a method for electrical discharge machining of a roll such as a rolling mill.
  • the roll of the roll used for dulling the steel strip has a dull surface on the roll itself.
  • dulling of rolls has recently been performed by electric discharge machining.
  • an arc discharge is generated by periodically applying a pulse waveform voltage between a workpiece and an electrode in an insulating machining fluid, and the heat is used to melt and remove the surface of the workpiece. It is a processing method. A clay-like depression is formed at the place where the discharge occurred on the roll surface, and the roll surface becomes rough.
  • the working fluid not only provides the insulating environment necessary for electric discharge, but also expels the processing powder, which is the residue generated by electric discharge machining, from the periphery of the electrode and absorbs the machining heat to cool the machined part.
  • the electric discharge machining of the rolling roll is typically performed by using an electric discharge machine equipped with an electrode arranged opposite to the roll to be processed, while rotating the roll and simultaneously moving the electrode in the roll axis direction. (Usually reciprocating). Therefore, the roll surface is continuously subjected to electrical discharge machining in a spiral shape, and spiral machining stripes are generated on the mouth surface. By repeating the movement of the electrode in the roll axis direction, the entire roll surface can be finally roughened by electric discharge machining. Since the gap between the electrode and the nozzle must be narrowed to cause discharge, the electrode is moved forward or backward by a servo motor attached to the electrode, and the gap is controlled to a size suitable for discharge. I do.
  • Rolls that have been dulled are used for dulling steel strips. Because of the rapid wear, the service life of the roll surface is usually several hours to several days. After the surface of the roll has been polished, the surface of the roll is polished to make the surface smooth, and then dulling is performed again by electric discharge machining. That is, the rolling roll is used repeatedly in a cycle of polishing-discharge machining ⁇ rolling until the roll diameter reaches a predetermined effective use diameter. Therefore, electric discharge machining must be performed in as short a time as possible.
  • an electric discharge machine in which a plurality of electrodes are arranged at regular intervals in the roll axis direction and circumferential direction in order to increase the machining area by one electric discharge. Can be used.
  • electric discharge machining has a phenomenon of concentration of electric discharge. This is because (1) electric discharge is likely to occur at the narrowest gap between the workpiece (roll) and the electrode, and (2) machining powder (roll or electrode shavings) generated by the electric discharge Since it is conductive and serves as a medium for transmitting electric discharge, electric discharge is likely to be generated at a location where machining powder has accumulated.
  • the tip of the electrode is consumed by the electric discharge machining of the roll. Therefore, after the end of the electric discharge machining, the electrode end face facing the roll has a curved shape along the outer circumferential shape in the roll circumferential direction and the crown shape in the roll axial direction.
  • this electrode is used to perform electrical discharge machining on a hole with a different hole diameter or a different crown shape, the gap between the roll and the electrode is partially narrowed, and the discharge is concentrated on that portion.
  • the machining powder stays around the electrode, and the discharge tends to concentrate near the place where the discharge once occurred.
  • JP-A-53-722% discloses that an electrode is divided into small pieces in order to prevent concentration of discharge.
  • U.S. Pat. No. 4,870,243 describes that a working fluid contains a small amount of powder of a conductive material such as graphite or metal particles for the purpose of stabilizing and dispersing an electric discharge.
  • Japanese Unexamined Patent Publication No. 55-150923 discloses that, in order to prevent a short circuit due to the contact between the electrodes and the roll, the electrodes are not arranged so as to be directed toward the axis of the roll. It is disclosed to dispose in a direction opposite to the direction.
  • An object of the present invention is to provide an electric discharge machine and an electric discharge machining method capable of preventing generation of strong machining streaks and a concentration phenomenon of electric discharge, and an electric discharge machining electrode used for the electric discharge machine.
  • the gap between the electrodes (the electrode / roll gap) is partially The discharge concentrates in that area, producing spiral machining marks.
  • the area of the electrode end face is large, the consumption of the electrode will be small, so the electrode will have a long diameter of the roll that has been processed earlier ⁇ the shape of the crown will remain long. Cause it to occur.
  • the present inventors have found that the change in the electrode / roll gap due to the change in the diameter of the roll to be processed has a small effect when the electrode is elongated in the roll axis direction and flattened, and the change in the diameter of the mouth is reduced.
  • the electrode hollow In order to avoid the concentration of electric discharge caused by the accumulation of machining powder near the electrode, it is effective to make the electrode hollow, allow the machining fluid to flow out of the electrode cavity, and create a flow of machining fluid outward from the electrode. It is.
  • the present invention is an electrode for electric discharge machining having a bore through which a machining fluid can flow out from a tip facing a workpiece, wherein the end face of the tip of the electrode is perpendicular to the electrode length direction.
  • the area of the electrode projection surface projected on the surface (hereinafter, referred to as the tip projection surface) excluding the hole corresponding to the lumen (hereinafter, referred to as the tip projection area) is 70 ⁇ 2 or less.
  • Discharge processing characterized by having a flattened shape in which the flattening ratio represented by the ratio (L / T) of the length (L) and the length (T) in the direction perpendicular to the length (L) is 1.5 or more.
  • the present invention relates to an electric discharge machine for a roll provided with one or two or more electrodes arranged to face a roll, wherein the electrode is capable of flowing a machining fluid from a tip facing the roll.
  • the end face of the electrode tip has an area excluding the hole corresponding to the lumen of the electrode projection surface (tip projection face) in which the end face is projected on a plane orthogonal to the electrode length direction (tip projection).
  • the one or more electrodes are arranged such that a length direction of the electrodes is directed to a roll axis.
  • the electrodes are preferably arranged in a plurality of rows in a roll circumferential direction and arranged in a staggered manner.
  • an electric discharge machining method for a roll using the electric discharge machine wherein the roll and the electrode are relatively moved in a circumferential direction and an axial direction of the roll while flowing a machining fluid from the inner cavity.
  • the present invention provides a method for electric discharge machining of a roll, characterized in that the electric discharge machining is performed on the roll in a spiral shape.
  • FIG. 1 is a schematic explanatory view of a roll electric discharge machine.
  • the figure shows the shape of the tip projection surface of the typical hollow electrodes A to D used in the test and the arrangement direction when the roll axis is set to the horizontal direction, together with the tip projection area (cross-sectional area).
  • FIG. 3 is a schematic view of a machined surface when electric discharge machining is performed using the electrodes A to D in FIG.
  • FIG. 4 is an explanatory diagram showing an example in which electrodes are arranged in a plurality of rows in a staggered manner.
  • FIG. 5 is an explanatory diagram showing the shape of the tip projection surface of the electrode used in the example.
  • 6 to 11 are explanatory diagrams showing the arrangement of the electrodes with respect to the roll.
  • -It is a side view seen from the axial direction.
  • FIG. 6 shows a state in which the electrodes are arranged out of the direction toward the roll axis.
  • FIG. 7 shows a state where the electrodes are arranged in a direction toward the roll axis.
  • Fig. 8 shows the situation when the roll processed using the electrode of Fig. 6 is changed from a smaller diameter roll [Fig. 8 (a)] to a larger diameter roll [Fig. 8 (b)]. .
  • FIG. 9 shows that the roll processed using the electrode of Fig. 7 is a smaller diameter roll [Fig. 9 (a)] This shows the situation when the roll was replaced with a larger diameter roll [Fig. 9 (b)].
  • FIG. 10 shows a case where a plurality of electrodes oriented in the roll axis direction are arranged in a plurality of rows in the roll circumferential direction.
  • FIG. 11 shows the positional relationship between the electrode and the large-diameter and small-diameter rolls when the electrode does not face the roll axis.
  • FIG. 1 schematically shows one example of an electric discharge machine used for electric discharge machining of a rolling roll.
  • a rolling roll 8 as a workpiece is rotatably attached to the electric discharge machine. That is, the rolling roll 8 is driven by the roll driving device 9 after the roll bearings on both sides thereof are mounted on the bearing base 11 and positioned by the end face fixing devices 5 and 6.
  • a plurality of electrodes are mounted in an appropriate arrangement on the electrode holder 7 of this electric discharge machine.
  • the electrode holder 7 is reciprocated in the axial direction of the shaft over the width of the mouth by rotating the bowl screw mechanism 12 passed through the head portion by the driving device 10.
  • the electrode is attached to the electrode holder via an appropriate servo motor and screw mechanism to control the gap between the electrode tip and the roll to the optimal size for discharge.
  • the gap between the electrode and the rolling roll is filled with a working fluid.
  • the electric discharge machining of the rolling rolls using the illustrated electric discharge machine is performed while rotating the rolling rolls and simultaneously moving the electrode holder and thus the electrodes in the roll axis direction. That is, the roll and the electrode, which are the workpieces, relatively move in both the circumferential direction and the axial direction of the roll during the electric discharge machining, so that the processing stripes formed by the electric discharge machining run spirally on the roll surface. .
  • an electric discharge machine that rotates the roll and moves the electrode in the axial direction is shown, but for the relative movement in the roll circumferential direction, the electrode is moved in the roll circumferential direction instead of rotating the roll. Or both may be used in combination. Similarly, with respect to the relative movement in the roll axis direction, not the electrode but the needle or both the roll and the electrode can be moved in the axial direction.
  • An electrode for electric discharge machining has a lumen for outflow of a machining fluid, and is provided from a tip of the electrode.
  • the working fluid can flow out toward the workpiece (eg, rolling roll).
  • this electrode is a tubular hollow electrode having a through hole therein.
  • the lumen only needs to have its outlet located at the tip of the electrode, and does not need to penetrate the entire length of the electrode in its length direction.
  • the inlet of the working fluid is located in the middle of the electrode length.
  • Well-known appropriate means can be used for supplying the working fluid to the internal cavity of the electrode.
  • the length direction of the electrode generally means the length direction of the elongated electrode for electric discharge machining, and intersects the end face of the tip of the electrode.
  • the end face may be curved or beveled due to the consumption of the electrode at the time of discharge, the length direction of the electrode and the end face of the tip are not always orthogonal.
  • the working fluid flows out from the tip through the lumen provided in the electrode. Therefore, the length direction substantially coincides with the outflow direction of the machining fluid.
  • the end face of the tip of the electrode facing the workpiece is formed by projecting this end face onto a plane orthogonal to the electrode length direction (hereinafter referred to as a tip projection face).
  • the area excluding the hole corresponding to the area (hereinafter referred to as the tip projected area) is 70 mm 2 or less, and the ratio of the maximum length (L) on the projection plane to the length (T) in the direction perpendicular to the maximum length (L). It has a flat shape with an oblateness represented by (L / T) of 1.5 or more.
  • the projected area of the electrode excluding the hole corresponding to the lumen refers to the area of the electrode end surface that is the discharge surface.
  • the lower limit is preferably about 10 mm 2 .
  • the tip projected area is more preferably 15 to 50 mm 2 .
  • the electrode having a flat outer shape according to the present invention is mounted on an electrode holder of the electric discharge machine so that the maximum length (L) of the projected surface of the tip is substantially parallel to the axial direction of the roll. Attached. This makes it possible to disperse the discharge without dividing the electrodes, thereby suppressing discharge concentration.
  • FIG. 2 shows the shape and arrangement of the tip projection surface of each hollow electrode, along with the tip projection area (shown as the cross-sectional area in the figure).
  • the roll axis direction is horizontal.
  • FIG. 3 shows the machining state of the roll surface when performing electric discharge machining using the electrodes A, B, C, and D shown in FIG.
  • Electrodes A and B are cylindrical hollow electrodes for comparison having a circular cross section and have different projected end areas.
  • the electrodes C and D are hollow electrodes having the same shape and a flat cross section according to the present invention, but have different orientations when attached to the electrode holder. That is, in the electrode C, the maximum length (L) (hereinafter, also referred to as the long axis) of the front end projection surface is oriented in the roll circumferential direction, whereas in the electrode D, the long axis is oriented in the mouth axis direction. It is suitable.
  • the discharge density is low. Is smaller than the size of the electrode (almost the size equivalent to the thickness of the electrode), and unevenness is sparse in the rest.
  • a spiral pattern composed of such a group of irregularities is applied to the roll, and the processing proceeds by expanding the group of irregularities with each pass.
  • the initial spiral pattern is no longer visible on the roll surface, but actually, more discharge occurs in the part of the group of spiral concavities and convexities than in other parts. Therefore, it is in a microscopic concave state. This dent is transferred to the steel strip when the steel strip is rolled using a roll.
  • the discharge is almost dispersed in the width of the electrode, and the spots with uneven spots cannot be formed.
  • the width at which discharge occurs (the width of the processing line) is narrow, the processing density is high, and a strong spiral processing mark is already generated from the initial stage of processing.
  • the relative movement speed (peripheral speed) of the roll / electrode in the circumferential direction due to the rotation of the mouth is much higher than the relative movement speed in the roll axis direction.
  • the relative speed of roll / electrode movement is The roll circumferential direction is 100 to 800 ram / sec
  • the mouth axis direction is 1 to 20 ram / sec
  • the intersection angle between the spiral and the roll circumferential direction is 10 ° or less. Therefore, relative movement is mainly in the circumferential direction.
  • the width of the electrode in the circumferential direction (the electrode dimension in the axial direction perpendicular to the circumferential direction) is as small as the short axis of the projected surface of the tip of the electrode. The result is similar to B.
  • a flat electrode when a flat electrode is subjected to electric discharge machining of a roll using an electrode D having the long axis of the projected surface of the tip directed in the roll axis direction, a group of small and convex as small as the thickness of the electrode is formed.
  • a processed pattern dispersed with a width reaching the long axis is formed.
  • the width of the electrode in the roll circumferential direction becomes the size of the major axis of the projected surface of the electrode tip, and the width of electric discharge machining is increased. Therefore, D has the best dispersibility of discharge.
  • the pattern of such a wide small uneven group is given in a spiral shape, the strength of the individual group formed first is low, so if the passes are overlapped, the spiral pattern becomes unclear and becomes uniform as a whole. Irregularities can be provided.
  • the flat electrode is arranged so that the long axis is parallel to the roll axis direction, the crooked wire will spread and disperse, so even if the tip projected area is small, the machining will not be strong, and machining by strong machining will be performed. It is possible to prevent the occurrence of marks.
  • the flatness represented by the ratio (L / T) of the maximum length (L) on the projected surface of the electrode tip to the length (T) in the direction orthogonal thereto is 1.5. That is all.
  • the oblateness is less than 1.5, the dispersibility of the discharge becomes insufficient, and the result is close to that of the electrode B.
  • the oblateness be 10 or less.
  • a more preferable aspect ratio is 3 to 8.
  • An appropriate oblateness can be selected depending on the equipment specifications and the extent to which the roll edge requires processing.
  • the electrode for electric discharge machining of the present invention can be manufactured from a conventionally used material such as copper, graphite, or a composite material of both.
  • the electrodes are preferably arranged in a staggered manner so that a plurality of rows are formed in the roll circumferential direction.
  • twelve electrodes are divided into three rows of four, with the long axis direction of the tip projection plane being parallel to the roll axis direction (horizontal direction in the figure). It is arranged. Therefore, the three rows are spaced apart in the roll circumferential direction. The separation distance of the electrodes in each row is the same, but the rows are slightly shifted from each other in the roll axis direction to form a staggered arrangement.
  • the area subjected to EDM on the first row of electrode groups partially overlaps the area subjected to EDM on the second row of electrode groups, resulting in EDM
  • An area that is not subjected to electric discharge machining does not remain between the areas.
  • the machining fluid used for EDM is usually insulating oil.
  • the working fluid may contain one or more powders selected from conductors such as carbon (eg, graphite), metal, silicon and the like, or semiconductors.
  • a particularly preferred powder to be added to the working fluid is bonbon.
  • the working fluid is directed from the tip of the electrode to the roll surface through the inner cavity of the electrode. Drain. If necessary, a part of the working fluid may be supplied through a path that does not pass through the electrode. Used working fluid can be reused for electrical discharge machining, for example, after removing machining powder by magnetic means.
  • the electric discharge machine described above with reference to FIG. 1 was mounted with hollow electrodes having various end projection shapes a to k shown in FIG.
  • each test twelve electrodes of the same projected shape were arranged on the EDM in a staggered manner as shown in Fig.4.
  • the electrodes were arranged such that the maximum length direction of the front projection surface was parallel to the roll axis direction.
  • the electric discharge machining test was performed while rotating the roll and reciprocating the electrode in the roll axis direction.
  • the working fluid used was an insulating oil, and this working fluid was allowed to flow out of the tip through the bore of the electrode during electrical discharge machining.
  • Table 1 shows the inspection results of the steel strip rolled using the rolls subjected to electrical discharge machining.
  • Table 1 the symbol “*” shown in the electrode tip projected area and the oblateness indicates that it is outside the scope of the present invention.
  • the sign “X” in the inspection result indicates that the spiral-shaped machined bars were conspicuous and that the roll had to be changed.
  • “ ⁇ ” indicates that the processing streaks are less noticeable, but that the processing streaks can be visually confirmed.
  • “ ⁇ ” indicates that no processed streaks were found.
  • the flatness ratio is electrical discharge machining rolling rolls using electrodes of 1.5 or more shapes, inspection of the steel strip that is rolled by the roll , Good results were obtained.
  • FIG. 6 shows a state in which the electric discharge machining electrode 1 is arranged at an angle such that its length direction does not face the axis 3 of the roll 2.
  • FIG. 7 shows a state in which the electrode 1 is arranged at an angle whose length direction faces the axis 3 of the roll 2 according to a preferred embodiment of the present invention.
  • FIG. 8 (a) shows a state in which the small-diameter roll is subjected to electric discharge machining with the electrode arrangement shown in FIG.
  • the end face of the electrode 1 facing the mouthpiece 2 has a curved surface along the curvature of the small-diameter roll due to wear due to electric discharge machining.
  • Arrows in the figure schematically show the flow of the working fluid.
  • FIG. 8A since the gap between the roll 2 and the electrode 1 is uniform, the machining fluid supplied through the electrode flows at a substantially uniform flow rate from anywhere in the gap.
  • FIG. 8 (b) shows a state in which the large-diameter roll is subjected to electric discharge machining by using the electrode 1 whose end face is curved along the curvature of the small-diameter roll.
  • discharge is likely to occur from part A where the gap between roll 2 and electrode 1 is the narrowest.
  • the machining fluid easily flows out of the part B with a large gap as indicated by the thick arrow, and the amount of the machining fluid decreases as indicated by the thin arrow in the part A. Therefore, in part A where discharge is likely to occur and the amount of machining powder generated is large, discharge is concentrated due to the accumulation of machining powder and the discharge is concentrated, and machining marks are likely to occur.
  • this electrode 1 When this electrode 1 is used for electric discharge machining of a large-diameter roll, as shown in FIG. 9 (b), discharge tends to occur near the electrode where the gap is narrowest. However, unlike FIG. 8 (b), the gap is uniform around the electrode, so that the same discharge occurs on both sides of the A and B parts. The flow of the machining fluid is almost uniform between the A and B sections. Therefore, the machining powder generated by the electric discharge does not stay locally, and the concentration of the electric discharge hardly occurs.
  • the electrode is cylindrical, the outflow of the working fluid from both sides of the electrode in the roll axis direction becomes large, and the flow of the working fluid may become uneven.
  • the electrodes having a flat cross section are arranged such that the long axis of the cross section is parallel to the axial direction. That Therefore, it is possible to minimize the increase in the outflow of machining fluid from both sides in the roll axis direction, so that discharge concentration can be effectively prevented.
  • FIG. 10 shows a case where electric discharge machining is performed using a plurality of electrodes arranged as shown in FIG. 9 (a).
  • the electrodes 1, ⁇ , 1 "arranged in three stages in the roll circumferential direction are all arranged to face the roll axis. Although not shown in the figure, each stage is shown in, for example, FIG. In this way, the electrodes are arranged in rows with a plurality of electrodes (for example, 3 to 6), and the electrodes in each stage are shifted from each other so that they do not overlap with the electrodes in other stages.
  • Each electrode can be advanced and retracted in the longitudinal direction of the electrode by a servo motor and screw mechanisms 4, 4 ', 4 "to control the gap between the roll and the electrode.
  • Fig. 11 shows a case where the electrodes are arranged as shown in Figs. 8 (a) and 8 (b), and the small diameter roll 2 and the large diameter hole 2 'are subjected to electrical discharge machining.
  • D is the diameter of the large-diameter roll
  • d is the diameter of the small-diameter roll
  • the electrode axis Is the intersection angle with Since the crossing angle in the case of the large-diameter roll 2 is smaller than ⁇ , it can be understood that the crossing angle changes depending on the roll diameter.
  • the electrodes are arranged as shown in FIG. 10, the angle is always 0 ° regardless of the aperture diameter.
  • Tables 2 and 3 show the results when the electrodes were arranged as shown in FIGS. 10 and 11, respectively, and the large-diameter roll and the small-diameter roll were subjected to electrical discharge machining.
  • the electrodes were configured such that four electrode rows were arranged in three rows in the roll circumferential direction.
  • the electrode used in the test was of a flat shape indicated by the symbol f in Table 1.
  • each electrode was positioned such that the intersection angle ⁇ with the small diameter hole was in the range of 2 to 5 °.
  • the present invention has been described with reference to the preferred embodiments, the present invention is not limited to the embodiments described above.
  • the flat shape of the electrode tip projection surface is preferably elliptical, but may be rectangular.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Abstract

La présente invention se rapporte à une électrode pour usinage par décharge électrique, à une machine à décharge électrique et à un procédé d'usinage par décharge électrique selon lequel il est possible d'éviter une concentration des décharges et d'effectuer sur un rouleau de laminage un usinage par décharge sans aucun défaut d'usinage en spirale aux fins de l'obtention d'une finition mate. Un rouleau est usiné en spirale par déplacement relatif dudit rouleau et d'une électrode suivant la direction circonférentielle et la direction axiale tandis qu'un liquide d'usinage est amené à partir d'une cavité au moyen d'une machine à décharge électrique comportant ladite cavité pour fournir le liquide d'usinage à partir de l'extrémité avant, la face terminale au niveau de l'extrémité avant de l'électrode ayant une forme plate possédant une surface inférieure ou égale à 70 mm2 en dehors d'une partie d'orifice correspondant à la cavité sur un plan perpendiculaire à la direction longitudinale de l'électrode sur laquelle la face terminale fait saillie, l'aplatissement représenté par le rapport (L/T) entre la longueur maximum (L) sur le plan de projection et la longueur (T) suivant la direction perpendiculaire à celui-ci étant supérieur ou égal à 1,5, et l'électrode étant disposée de sorte que la longueur maximum (L) sur le plan de projection devienne sensiblement parallèle à la direction axiale du rouleau.
PCT/JP2002/012808 2002-12-06 2002-12-06 Electrode pour usinage par decharge electrique et machine a decharge electrique pour procede de laminage et d'usinage WO2004052579A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AU2002354436A AU2002354436A1 (en) 2002-12-06 2002-12-06 Electrode for electric discharge machining and electric discharge machine for roll and machining method
CNB028299876A CN100404183C (zh) 2002-12-06 2002-12-06 放电加工用电极、辊的放电加工机和加工方法
PCT/JP2002/012808 WO2004052579A1 (fr) 2002-12-06 2002-12-06 Electrode pour usinage par decharge electrique et machine a decharge electrique pour procede de laminage et d'usinage

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PCT/JP2002/012808 WO2004052579A1 (fr) 2002-12-06 2002-12-06 Electrode pour usinage par decharge electrique et machine a decharge electrique pour procede de laminage et d'usinage

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US10245759B2 (en) 2010-03-19 2019-04-02 Upcycle Holdings Limited Moulding machine and process for forming a mould
GB2616344A (en) * 2022-01-10 2023-09-06 Sarclad Ltd Improvements to electrical discharge texturing machines

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GB2462419A (en) * 2008-08-04 2010-02-10 Sarclad Ltd Method and apparatus for improving roll texturing using electrical discharge machining

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US6165422A (en) * 1999-03-01 2000-12-26 Modern Hard Chrome Service Company Apparatus for electric-discharge texturing of a roll

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US10245759B2 (en) 2010-03-19 2019-04-02 Upcycle Holdings Limited Moulding machine and process for forming a mould
GB2616344A (en) * 2022-01-10 2023-09-06 Sarclad Ltd Improvements to electrical discharge texturing machines

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