US20060107721A1 - Punch for punching sheet metal and apparatus for punching sheet metal having the punch - Google Patents

Punch for punching sheet metal and apparatus for punching sheet metal having the punch Download PDF

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Publication number
US20060107721A1
US20060107721A1 US10/554,425 US55442504A US2006107721A1 US 20060107721 A1 US20060107721 A1 US 20060107721A1 US 55442504 A US55442504 A US 55442504A US 2006107721 A1 US2006107721 A1 US 2006107721A1
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US
United States
Prior art keywords
punch
sheet metal
outer edge
hole
face
Prior art date
Legal status (The legal status 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 status listed.)
Abandoned
Application number
US10/554,425
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English (en)
Inventor
Masatoshi Oishi
Yukiharu Uemura
Hiroshi Tsuji
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Oiles Corp
Ones Co Ltd
Original Assignee
Oiles Corp
Ones Co 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
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Assigned to OILES CORPORATION, ONES CO., LTD. reassignment OILES CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TSUJI, HIROSHI, UEMURA, YUKIHARU, OISHI, MASATOSHI
Publication of US20060107721A1 publication Critical patent/US20060107721A1/en
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D28/00—Shaping by press-cutting; Perforating
    • B21D28/24—Perforating, i.e. punching holes
    • B21D28/34—Perforating tools; Die holders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D28/00—Shaping by press-cutting; Perforating
    • B21D28/24—Perforating, i.e. punching holes
    • B21D28/26—Perforating, i.e. punching holes in sheets or flat parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/02—Perforating by punching, e.g. with relatively-reciprocating punch and bed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/02—Perforating by punching, e.g. with relatively-reciprocating punch and bed
    • B26F1/14—Punching tools; Punching dies

Definitions

  • the present invention relates to a punch for punching sheet metal and an apparatus for punching sheet metal having the punch.
  • a punching apparatus has been proposed in which a punch, which includes a cylindrical body having a smaller outside diameter than the hole diameter of a die and a conical projection provided on one end face of this cylindrical body, is pressed against sheet metal to form a pierced hole in the sheet metal.
  • a punch which includes a cylindrical body having a smaller outside diameter than the hole diameter of a die and a conical projection provided on one end face of this cylindrical body, is pressed against sheet metal to form a pierced hole in the sheet metal.
  • Patent Document 1 JP-A-2002-153920
  • the sheet metal is positioned by the projection, and a through hole is formed by applying mainly a tensile force rather than a shearing force to the sheet metal, so that the through hole can be formed accurately in the sheet metal without producing burrs.
  • a through hole is formed by applying mainly a tensile force rather than a shearing force to the sheet metal, so that the through hole can be formed accurately in the sheet metal without producing burrs.
  • the pierced hole cannot be formed desirably in the sheet metal by the projection.
  • the present inventors came to complete the present invention after finding out that a through hole can be formed accurately in the sheet metal by a projection of a particular shape and the like, and burrs are not produced in the sheet metal after the formation of the through hole.
  • an object of the present invention is to provide a punch and a punching apparatus having the punch, in which even if the thickness of the sheet metal where a through hole is to be formed is different, and even if the size, e.g., the diameter, and shape of the through hole to be formed in the sheet metal are different, punching can be optimally performed with respect to the sheet metal having a different thickness and the through hole of a different size and shape, and which make it possible to form a through hole with no burrs and at an accurate position.
  • a punch for punching sheet metal in accordance with a first aspect of the invention comprises: a punch body; and a projection formed in the shape of one of a cone and a pyramid and provided integrally on one end face of the punch body, the projection having a base with an outer edge inscribing an imaginary circle which is concentric with a center of an imaginary circle inscribed by an outer edge of the end face, and which has a smaller diameter than a diameter of that imaginary circle, wherein an angle ⁇ formed by the end face and a tangential line, which intersects an axis passing through the center of the imaginary circle inscribed by the outer edge of the end face, and which touches both a distal end face of the projection and the imaginary circle inscribed by the outer edge of the end face, is not less than 25° and not more than 60°, and a ratio e/L between, on the one hand, a difference e between a radius D 1 / 2 of the imaginary circle inscribed by the outer edge of the end face and a radius d 1 / 2 of the
  • a pierced hole is first formed in the sheet metal by the projection, the movement of the sheet metal is restricted by the projection inserted in this pierced hole, and the sheet metal is subsequently fractured around the end face of the punch body, thereby forming a through hole in the sheet metal.
  • the present invention is based on the following view: With such a punch, if the projection is too low, the projection comes off the pierced hole, which makes it impossible to restrict the movement of the sheet metal. If the projection is too high, the bending, breakage, or the like of the projection can occur, which requires frequent replacement.
  • the sheet metal cannot be fractured satisfactorily due to the effect of the pierced hole. If the diameter of the imaginary circle inscribed by the base of the projection is extremely smaller than the diameter of the imaginary circle inscribed by the end face of the punch body, the bending, breakage, or the like of the projection can occur, which requires frequent replacement.
  • the present inventors found out that even if the thickness of the sheet metal where a through hole is to be formed is different, and even if the size, e.g., the diameter, and shape of the through hole to be formed in the sheet metal are different, if the angle ⁇ is not less than 25°, it is possible to effectively prevent the coming off of the projection from the pierced hole.
  • the ratio e/L is not less than 0.05, the sheet metal can be satisfactorily fractured by eliminating the effect of the pierced hole.
  • the angle ⁇ is not more than 60° and the ratio e/L is not more than 0.05, it is possible to satisfactorily avoid the bending, breakage, or the like of the projection.
  • the punch for punching sheet metal in accordance with the first aspect of the invention it is possible to optimally perform punching with respect to the sheet metal having a different thickness and the through hole having a different size and a different shape, thereby making it possible to form the through hole with no burrs and at an accurate position.
  • the distal end of the projection may be pointed or slightly rounded.
  • the angle ⁇ is less than 30° and not more than 55°, and the ratio e/L is not less than 0.09 and not more than 0.12.
  • the outer edge of the end face may not be chamfered.
  • the outer edge of the end face is preferably chamfered with a radius of curvature R of between 0.3 mm and 3 mm, as in the punch in accordance with a third aspect of the invention.
  • a diameter D 1 of the imaginary circle inscribed by the outer edge of the end face is preferably not more than 100 mm as in the punch in accordance with a fourth aspect of the invention, more preferably not more than 35 mm as in the punch in accordance with a fifth aspect of the invention, and still more preferably not more than 30 mm as in the punch in accordance with a sixth aspect of the invention.
  • the punch is arranged such that as a pierced hole is formed in the sheet metal by the projection, and the punch body is further inserted into a hole of a die in a state in which the movement of the sheet metal is restricted by the projection inserted in the pierced hole, the sheet metal is fractured around the end face of the punch body, thereby forming a through hole in the sheet metal, and the punch is used for an apparatus for punching sheet metal.
  • the punch body may be formed in the shape of a circular cylinder, and the outer edge of the end face of the punch body may be formed in the shape of a circle, as in the punch in accordance with a ninth aspect of the invention; the punch body may be formed in the shape of a prism including a triangular prism, and the outer edge of the end face of the punch body may be formed in the shape of a polygon including a triangle, as in the punch in accordance with a 10th aspect of the invention; or the punch body may be formed in the shape of an elliptic cylinder, and the outer edge of the end face of the punch body may be formed in the shape of an ellipse, as in the punch in accordance with an 11th aspect of the invention.
  • the punch body and the outer edge of its end face may have various shapes in connection with the through hole to be formed.
  • the shapes of the punch body and the outer edge of its end face are not limited to the shapes of a circular cylinder, a prism, and an elliptic cylinder, as well as a circle, a polygon, and an ellipse, and the punch body and the outer edge of its end face may have other shapes in connection with the through hole to be formed.
  • the projection may be formed in the shape of a circular cone, and the outer edge of the base of the projection may be formed in the shape of a circle, as in the punch in accordance with a 12th aspect of the invention; the projection may be formed in the shape of an elliptic cone, and the outer edge of the base of the projection may be formed in the shape of an ellipse, as in the punch in accordance with a 13th aspect of the invention; and the projection may be formed in the shape of a pyramid including a triangular pyramid, and the outer edge of the base of the projection may be formed in the shape of a polygon including a triangle, as in the punch in accordance with a 14th aspect of the invention.
  • Such a projection and the outer edge of its base may have various shapes in connection with the thickness of the sheet metal where the through hole is to be formed, as well as the through hole to be formed.
  • the shapes of the projection and the outer edge of its base are not limited to the shapes of a circular cone, an elliptic cone, and a pyramid, as well as a circle, an ellipse, and a polygon, and the projection and the outer edge of its base may have other shapes in connection with the thickness of the sheet metal where the through hole is to be formed, as well as the through hole to be formed.
  • An apparatus for punching sheet metal in accordance with a first aspect of the invention comprises: the punch for punching sheet metal according to any one of the above-described aspects; and the die having the hole into which the punch is inserted, wherein a ratio D 1 /D 2 of a diameter D 2 of an imaginary circle inscribed by an outer edge of the hole of the die with respect to the diameter D 1 of the imaginary circle inscribed by the outer edge of the end face is not less than 0.80, and if the thickness of the sheet metal to be punched is assumed to be t, a difference f between the radius D 1 / 2 of the imaginary circle inscribed by the outer edge of the end face and a radius D 2 / 2 of the imaginary circle inscribed by the outer edge of the hole of the die is not less than 0.15 t.
  • a through hole is formed in the sheet metal by mainly causing tensile fracture to occur by applying slight shear to the sheet metal by means of the punch and the die.
  • the ratio D 1 /D 2 is excessively small, shear does not practically take place, and if the difference f is excessively small, shear mainly takes place, and the tensile fracture fails to take place.
  • the ratio D 1 /D 2 is not less than 0.80, and the difference f is not less than 0.15 t, as in the punching apparatus in accordance with the first aspect, tensile fracture is mainly caused to occur in addition to slight shear, making it possible to effectively form the through hole in the sheet metal.
  • the ratio D 1 /D 2 is not less than 0.85, as in the punching apparatus in accordance with a second aspect of the invention, it is possible to form the through hole in the sheet metal more effectively.
  • the difference f as a clearance of the punch with respect to the hole of the die is sufficient if it is not less than 0.15 t. Preferably, however, it suffices if the difference f is not more than 2 mm, as in the punching apparatus in accordance with a third aspect of the invention.
  • the punching apparatus is arranged such that as a pierced hole is formed in the sheet metal by the projection, and the punch body is further inserted into the hole of the die in a state in which the movement of the sheet metal is restricted by the projection inserted in the pierced hole, the sheet metal is fractured around the end face of the punch body, thereby forming a through hole in the sheet metal.
  • the die may further include a small hole which is continuous with the hole and has an outer edge inscribing an imaginary circle of a diameter D 3 which is smaller than the diameter D 2 of the imaginary circle inscribed by the outer edge of the hole and is greater than diameter D 1 of the imaginary circle inscribed by the outer edge of the end face. If such a small hole is provided, punch waste (scraps) produced after the formation of the through hole can be held in the small hole.
  • At least one of the hole and the small hole may be formed in the shape of a circle, a polygon including a triangle, or an ellipse in correspondence with the shape of the punch body.
  • the sheet metal which is punched by the punching apparatus in accordance with the invention its thickness is 0.4 mm to 2.0 mm or thereabouts to obtain a satisfactory result. To obtain a more satisfactory result, however, its thickness is 0.6 mm to 1.6 mm or thereabouts.
  • a punch unit in accordance with a first aspect of the invention comprises: a case; a slider fitted to the case vertically slidably; the punch according to any one of first to 14th aspects fitted in the slider vertically slidably; and returning means disposed in the slider and adapted to return the punch and the slider to their initial positions by upwardly resiliently urging the punch and the slider.
  • the punch unit in accordance with the first aspect preferably further comprises: a slide guiding member provided in the case so as to guide the vertical movement of the punch.
  • the slider may have a recess and may be adapted to engage at the recess a detent pin secured to the case, so that the slider does not come off the case by the resiliency of the returning means.
  • the returning means preferably has a coil spring; however, the present invention is not limited to the same, and another resilient member may be used.
  • a punch and a punching apparatus having the punch, in which even if the thickness of the sheet metal where a through hole is to be formed is different, and even if the size and shape of the through hole to be formed in the sheet metal are different, punching can be optimally performed with respect to the sheet metal having a different thickness and the through hole of a different size and shape, and which make it possible to form a through hole with no burrs and at an accurate position.
  • an apparatus 1 for punching sheet metal in accordance with this embodiment includes an upper die holder 2 which is raised and lowered by a hydraulic ram and the like; a pressing plate 3 secured to the upper die holder 2 ; a pressing pad 5 suspended from the upper die holder 2 through a resilient member 4 ; a punch holder 7 constructed as a punch unit secured to the pressing pad 5 by means of a bolt 6 and the like; a lower die 9 on which sheet metal 8 to be subjected to punching is placed; and a die 10 embedded in the lower die 9 .
  • the punch holder 7 includes a hollow cylindrical case 11 secured to the pressing pad 5 by means of the bolt 6 and the like; a hollow cylindrical slider 12 fitted to the case 11 vertically slidably; a punch 13 fitted in the slider 12 vertically slidably; a returning means having a coil spring 14 which is disposed in the slider 12 and is adapted to return the punch 13 and the slider 12 to their initial positions by upwardly resiliently urging the punch 13 and the slider 12 by means of the punch 13 ; and a slide guiding member 15 provided in the case 11 so as to guide the vertical movement of the punch 13 .
  • the slider 12 has a recess 22 , and is adapted to engage at the recess 22 a detent pin 21 secured to the case 11 , so that the slider 12 does not come off the case 11 by the resiliency of the coil spring 14 .
  • the slider is adapted to be pressed downward by the pressing plate 3 when the upper die holder 2 is lowered.
  • the punch 13 for punching the sheet metal 8 includes a punch body 25 formed in the shape of a circular cylinder; a projection 28 formed in the shape of one of a cone and a pyramid (circular cone in this embodiment) and provided integrally on one circular end face 26 of the punch body 25 , the projection 28 having a circular base 27 with a circular outer edge 31 inscribing an imaginary circle which is concentric with the center of an imaginary circle touched by a circular outer edge 35 of the end face 26 (in the case of the circular end face 26 , such an imaginary circle agrees with the circular outer edge 35 of that end face 26 ), and which has a smaller diameter d 1 than an outside diameter D 1 of that imaginary circle (in the case of the circular base 27 , the imaginary circle having the diameter d 1 agrees with the circular outer edge 31 of that base 27 ); and a collar portion 30 provided integrally on the other circular end face 29 of the punch body 25 .
  • a ratio e/L between, on the one hand, a difference e between a radius D 1 / 2 of the imaginary circle inscribed by the outer edge 35 of the end face 26 , i.e., the circular outer edge 35 itself, and a radius d 1 / 2 of the imaginary circle inscribed by the circular outer edge 31 of the base 27 of the projection 28 , i.e., the circular outer edge 31 itself, and, on the other hand, a length L ( ⁇ D 1 ) of the imaginary circle inscribed by the outer edge 35 of the end face 26 , i.e., the length of the outer edge 35 itself, is a value which is not less than 0.05 and not more than 0.14.
  • the outer edge 35 of the end face 26 is chamfered with a radius of curvature R of not less than 0.3 mm and not more than 3 mm.
  • the angle ⁇ may be not less than 30° and not more than 55°, and the ratio e/L may be not less than 0.09 and not more than 0.12.
  • the coil spring 14 abuts against the collar portion 30 at one end thereof and a flange portion 41 of the slide guiding member 15 at the other end thereof.
  • the slide guiding member 15 has, in addition to the flange portion 41 , a cylindrical portion 43 formed integrally with the flange portion 41 and fitted in the case 11 in a hole 42 of the case 11 , and slidably guides and supports a lower end portion of the punch body 25 of the punch 13 on the inner peripheral surface of the cylindrical portion 43 .
  • the die 10 has a circular hole 51 which is a hole into which the punch 13 is inserted, as well as a circular hole 52 continuous with the circular hole 51 and having a larger diameter than the circular hole 51 so as to discharge punch waste 57 .
  • a ratio D 1 /D 2 of a diameter D 2 of an imaginary circle inscribed by a circular outer edge 53 of the circular hole 51 (in this embodiment, this imaginary circle and the circular outer edge 53 of the circular hole 51 agree) with respect to a diameter D 1 of the imaginary circle inscribed by the outer edge 35 of the end face 26 , i.e., the circular outer edge 35 , is not less than 0.80.
  • a difference (clearance) f between the radius D 1 / 2 of the imaginary circle inscribed by the outer edge 35 of the end face 26 , i.e., the circular outer edge 35 itself, and a radius D 2 / 2 of the imaginary circle inscribed by the circular outer edge 53 of the circular hole 51 of the die 10 , i.e., the circular outer edge 53 itself of the circular hole 51 , is not less than 0.1 St and not more than 2 mm.
  • the ratio D 1 /D 2 may be not less than 0.85, and the diameter D 1 may be not more than 100 mm, not more than 35 mm, or not more than 30 mm.
  • the sheet metal 8 placed on the lower die 9 is pressed by the pressing pad 5 and is fixed by being clamped between the lower die 9 and the pressing pad 5 .
  • the slider 12 is pressed by the pressing plate 3 , and the punch 13 is lowered in conjunction with the lowering of the slider 12 .
  • a pierced hole 55 is formed in the sheet metal 8 by the projection 28 , as shown in FIG. 5 .
  • the punch 13 since the angle ⁇ is not less than 25°, even if the diameter of the through hole 56 to be formed in the sheet metal 8 is different, it is possible to effectively prevent the coming off of the projection 28 from the pierced hole 55 .
  • the ratio e/L is not less than 0.05, the sheet metal 8 can be satisfactorily tension-fractured by eliminating the effect of the pierced hole 55 .
  • the angle ⁇ is not more than 60° and the ratio e/L is not more than 0.05, it is possible to satisfactorily avoid the bending, breakage, or the like of the projection 28 .
  • the outer edge 35 of the end face 26 is chamfered with a radius of curvature R of not less than 0.3 mm and not more than 3 mm, it is possible to reduce the effect of shear constituting the cause of burrs and more satisfactorily tension-fracture the sheet metal 8 . Furthermore, since the ratio D 1 /D 2 is not less than 0.80, and the difference f is not less than 0.15 t, tensile fracture is mainly caused to occur in addition to slight shear, making it possible to effectively form the through hole 56 in the sheet metal 8 .
  • the through hole 56 is formed by vertically moving the punch 13 , but the through hole 56 may be formed in an inclined portion of the sheet metal 8 by obliquely moving the punch 13 .
  • the die 10 is constructed by including the circular hole 51 into which the punch 13 is inserted as well as the circular hole 52 for discharging the punch waste 57
  • the die 10 may alternatively be constructed by further including, in addition to the circular hole 51 and the circular hole 52 , a small hole, i.e., a small circular hole 61 in this embodiment, which is continuous with the circular hole 51 and has a circular outer edge 60 inscribing an imaginary circle of a diameter D 3 which is smaller than the diameter D 2 of the imaginary circle inscribed by the circular outer edge 53 of the circular hole 51 , i.e., the circular outer edge 53 itself of the circular hole 51 , and which is greater than diameter D 1 of the imaginary circle inscribed by the circular outer edge 35 of the end face 26 , i.e., the circular outer edge 35 itself (in the case of such a small circular hole 61 , the imaginary circle of the diameter D 3 and the circular outer edge 60 of the small circular hole 61 agree), as shown in FIG.
  • the punch body 25 is formed in the shape of a circular cylinder, and the hole of the die 10 is also the circular hole 51 corresponding to the shape of the punch body 25 .
  • the punch body 25 may be formed in the shape of a regular quadrangular prism, a quadrangular prism, an elliptic cylinder, and the outer edge 35 of the end face 26 of the punch body 25 may be formed in the shape of a regular quadrangle (square), a quadrangle (rectangle), or an ellipse.
  • the die 10 one whose hole is the hole 51 in the form of a regular quadrangle (square), a quadrangle (rectangle), or an ellipse corresponding to the shape of the punch body 25 is used.
  • the ratio e/L between, on the one hand, the difference e between the radius D 1 / 2 of the imaginary circle 71 inscribed by the outer edge 35 of the end face 26 and the radius d 1 / 2 of the imaginary circle inscribed by the circular outer edge 31 of the base 27 of the projection 28 , i.e., the circular outer edge 31 itself, and, on the other hand, the length L ( ⁇ D 1 ) of the imaginary circle 71 inscribed by the outer edge 35 of the end face 26 , is a value which is not less than 0.05 and not more than 0.14.
  • the outer edge 35 of the end face 26 is chamfered with the radius of curvature R of not less than 0.3 mm and not more than 3 mm.
  • the ratio D 1 /D 2 of the diameter D 2 of an imaginary circle 72 inscribed by the outer edge 53 of the regular quadrangular hole 51 with respect to the diameter D 1 of the imaginary circle 71 inscribed by the outer edge 35 of the end face 26 is not less than 0.80. If the thickness of the sheet metal 8 to be punched is assumed to be t, the difference f between the radius D 1 / 2 of the imaginary circle 71 inscribed by the outer edge 35 of the end face 26 and the radius D 2 / 2 of the imaginary circle 72 inscribed by the outer edge 53 of the regular quadrangular hole 51 of the die 10 , is not less than 0.15 t and not more than 2 mm.
  • the ratio e/L between, on the one hand, the difference e between the radius D 1 / 2 of the imaginary circle 71 inscribed by the outer edge 35 of the end face 26 and the radius d 1 / 2 of the imaginary circle inscribed by the circular outer edge 31 of the base 27 of the projection 28 , i.e., the circular outer edge 31 itself, and, on the other hand, the length L ( ⁇ D 1 ) of the imaginary circle 71 inscribed by the outer edge 35 of the end face 26 , is a value which is not less than 0.05 and not more than 0.14.
  • the outer edge 35 of the end face 26 is chamfered with the radius of curvature R of not less than 0.3 mm and not more than 3 mm.
  • the ratio D 1 /D 2 of the diameter D 2 of the imaginary circle 72 inscribed by the outer edge 53 of the quadrangular hole 51 with respect to the diameter D 1 of the imaginary circle 71 inscribed by the outer edge 35 of the end face 26 is not less than 0.80. If the thickness of the sheet metal 8 to be punched is assumed to be t, the difference f between the radius D 1 / 2 of the imaginary circle 71 inscribed by the outer edge 35 of the end face 26 and the radius D 2 / 2 of the imaginary circle 72 inscribed by the outer edge 53 of the quadrangular hole 51 of the die 10 , is not less than 0.15 t and not more than 2 mm.
  • the ratio e/L between, on the one hand, the difference e between the radius D 1 / 2 of the imaginary circle 71 inscribed by the outer edge 35 of the end face 26 and the radius d 1 / 2 of the imaginary circle inscribed by the circular outer edge 31 of the base 27 of the projection 28 , i.e., the circular outer edge 31 itself, and, on the other hand, the length L ( ⁇ D 1 ) of the imaginary circle 71 inscribed by the outer edge 35 of the end face 26 , is a value which is not less than 0.05 and not more than 0.14.
  • the outer edge 35 of the end face 26 is chamfered with the radius of curvature R of not less than 0.3 mm and not more than 3 mm.
  • the ratio D 1 /D 2 of the diameter D 2 of the imaginary circle 72 inscribed by the outer edge 53 of the elliptical hole 51 with respect to the diameter D 1 of the imaginary circle 71 inscribed by the outer edge 35 of the end face 26 is not less than 0.80. If the thickness of the sheet metal 8 to be punched is assumed to be t, the difference f between the radius D 1 / 2 of the imaginary circle 71 inscribed by the outer edge 35 of the end face 26 and the radius D 2 / 2 of the imaginary circle 72 inscribed by the outer edge 53 of the elliptical hole 51 of the die 10 , is not less than 0.15 t and not more than 2 mm.
  • a projection 28 formed in the shape of a circular cone is used in the above-described punching apparatus 1
  • a projection 28 formed in the shape of a hexagonal pyramid which is one of polygonal pyramids including a triangular pyramid, may alternatively be used, as shown in FIGS. 14 and 15 . As shown in FIGS.
  • the ratio e/L between, on the one hand, the difference e between the radius D 1 / 2 of the imaginary circle inscribed by the outer edge 35 of the end face 26 , i.e., the circular outer edge 35 itself, and the radius d 1 / 2 of an imaginary circle 73 inscribed by the hexagonal outer edge 31 of the base 27 of the projection 28 , and, on the other hand, the length L ( ⁇ D 1 ) of the imaginary circle inscribed by the outer edge 35 of the end face 26 , i.e., the outer edge 35 itself, is a value which is not less than 0.05 and not more than 0.14.
  • the outer edge 35 of the end face 26 is chamfered with the radius of curvature R of not less than 0.3 mm and not more than 3 mm. Meanwhile, the thickness t and the difference f are set in the same way as described above.
  • the angle ⁇ may be not less than 30° and not more than 55°, and the ratio e/L may be not less than 0.09 and not more than 0.12.
  • the ratio D 1 /D 2 may be not less than 0.85, and the diameter D 1 may be not more than 100 mm, not more than 35 mm, or not more than 30 mm.
  • the punch holder 7 such as the one shown in FIG. 16 may be used instead of the punch holder 7 in the apparatus 1 for punching sheet metal shown in FIG. 1 .
  • the collar portion 30 provided integrally on the other circular end face 29 of the punch body 25 is positioned by being inserted and secured in a circular cavity 75 of the slider 12 .
  • the slide guiding member 15 is omitted, and the lower end portion of the punch body 25 is slidably guided and supported by, instead of the slide guiding member 15 , a hollow cylindrical inner peripheral surface 76 of the case 11 defining the hole 42 .
  • a detent pin 77 is threadedly secured in the slider 12 in which the recess 22 is omitted.
  • the detent pin 77 is adapted to engage the case 11 in an elongated hole 78 provided in the case 11 so that the slider 12 will not come off the case 11 by the resiliency of the coil spring 14 .
  • the coil spring 14 abuts at one end thereof against a spring seat 79 engaged with the collar portion 30 and at the other end thereof against an annular end 80 of the case 11 , and is disposed in the case 11 concentrically with the punch 13 in such a manner as to surround the punch 13 .
  • the punch holder 7 shown in FIG. 16 is secured to the pressing pad 5 at an annular collar 82 of the case 11 by means of the bolt 6 and an engaging plate 81 . Also with the punch holder 7 in FIG.
  • FIG. 1 is a cross-sectional view of a preferred embodiment of the present invention
  • FIG. 2 is an explanatory side view of a portion of a punch used in the embodiment shown in FIG. 1 ;
  • FIG. 3 is a front elevational view of the punch shown in FIG. 2 ;
  • FIG. 4 is an explanatory diagram of the punch and a die used in the embodiment shown in FIG. 1 ;
  • FIG. 5 is a diagram explaining the operation of the embodiment shown in FIG. 1 ;
  • FIG. 6 is a diagram explaining the operation of the embodiment shown in FIG. 1 ;
  • FIG. 7 is a cross-sectional view of a portion of another preferred embodiment of the present invention.
  • FIG. 8 is an explanatory side view of a portion of another preferred example of the punch.
  • FIG. 9 is a front elevational view illustrating the relationship between the punch and the die shown in FIG. 8 ;
  • FIG. 10 is one explanatory side view of a portion of still another preferred example of the punch.
  • FIG. 11 is another explanatory side view of the punch shown in FIG. 10 ;
  • FIG. 12 is a front elevational view illustrating the relationship between the punch shown in FIGS. 10 and 11 and the die;
  • FIG. 13 is a front elevational view illustrating the relationship between the die and the punch in accordance with a further preferred example
  • FIG. 14 is an explanatory side view of a still further preferred example of the punch.
  • FIG. 15 is a front elevational view illustrating the relationship between the punch and the die shown in FIG. 14 ;
  • FIG. 16 is a cross-sectional view of a portion of still another preferred embodiment of the present invention.
US10/554,425 2003-04-30 2004-04-28 Punch for punching sheet metal and apparatus for punching sheet metal having the punch Abandoned US20060107721A1 (en)

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JP2003125309 2003-04-30
PCT/JP2004/005668 WO2004096464A1 (ja) 2003-04-30 2004-04-28 薄板金属の孔明け用のパンチ及びこのパンチを具備した薄板金属の孔明け装置

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EP (1) EP1621268B1 (es)
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DE102006053223B3 (de) * 2006-11-11 2008-02-07 KUKA Systems GmbH Geschäftsbereich Werkzeugbau Loch- und Durchzugsstempel
US20080101852A1 (en) * 2006-10-30 2008-05-01 Bedol Mark A Holepunch for a ringed binder
US20100199739A1 (en) * 2009-02-12 2010-08-12 Thaddaeus Sunil J S Interchangeable spring loaded scrap cutter
US20100212388A1 (en) * 2007-05-22 2010-08-26 Ones Co., Ltd. Die for punching sheet metal and sheet metal punching apparatus having the die
US20110094358A1 (en) * 2008-06-18 2011-04-28 Aramizu Teruo Punch for punching sheet metal, sheet metal punching apparatus having the punch, and method therefor
CN102179448A (zh) * 2011-04-01 2011-09-14 安徽嘉瑞模具有限公司 一种自动化汽车盒子件三合一冲压模具及其冲压工艺
CN102179447A (zh) * 2011-03-31 2011-09-14 安徽嘉瑞模具有限公司 一种拉延和修边二合一的汽车冲压模具及其冲压工艺
US20170001233A1 (en) * 2015-06-30 2017-01-05 Trumpf Werkzeugmaschinen Gmbh + Co. Kg Punching Tools
CN107282784A (zh) * 2017-07-05 2017-10-24 太仓市伦凯自动化设备有限公司 一种冲头衬套
CN107553593A (zh) * 2017-10-16 2018-01-09 扬中市盛新氟塑制品有限公司 一种四氟垫片冲压模具
US20190129327A1 (en) * 2017-10-27 2019-05-02 Canon Kabushiki Kaisha Image forming apparatus including optical print head
US11156413B2 (en) * 2016-12-26 2021-10-26 T.Rad Co., Ltd. Metal plate burring method
US11267035B2 (en) * 2018-06-23 2022-03-08 Dongguan University Of Technology Integrated flattening, cutting, and collecting assembly capable of integrity maintenance
CN117102338A (zh) * 2023-10-19 2023-11-24 山东帝盟重工机械有限公司 一种变速箱壳板的冲压装置

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Cited By (17)

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Publication number Priority date Publication date Assignee Title
US20080101852A1 (en) * 2006-10-30 2008-05-01 Bedol Mark A Holepunch for a ringed binder
DE102006053223B3 (de) * 2006-11-11 2008-02-07 KUKA Systems GmbH Geschäftsbereich Werkzeugbau Loch- und Durchzugsstempel
US20100212388A1 (en) * 2007-05-22 2010-08-26 Ones Co., Ltd. Die for punching sheet metal and sheet metal punching apparatus having the die
US20110094358A1 (en) * 2008-06-18 2011-04-28 Aramizu Teruo Punch for punching sheet metal, sheet metal punching apparatus having the punch, and method therefor
US20100199739A1 (en) * 2009-02-12 2010-08-12 Thaddaeus Sunil J S Interchangeable spring loaded scrap cutter
US8613213B2 (en) * 2009-02-12 2013-12-24 Magna International Inc. Interchangeable spring loaded scrap cutter
CN102179447A (zh) * 2011-03-31 2011-09-14 安徽嘉瑞模具有限公司 一种拉延和修边二合一的汽车冲压模具及其冲压工艺
CN102179448A (zh) * 2011-04-01 2011-09-14 安徽嘉瑞模具有限公司 一种自动化汽车盒子件三合一冲压模具及其冲压工艺
US20170001233A1 (en) * 2015-06-30 2017-01-05 Trumpf Werkzeugmaschinen Gmbh + Co. Kg Punching Tools
US11117179B2 (en) * 2015-06-30 2021-09-14 Trumpf Werkzeugmaschinen Gmbh + Co. Kg Punching tools
US11156413B2 (en) * 2016-12-26 2021-10-26 T.Rad Co., Ltd. Metal plate burring method
CN107282784A (zh) * 2017-07-05 2017-10-24 太仓市伦凯自动化设备有限公司 一种冲头衬套
CN107553593A (zh) * 2017-10-16 2018-01-09 扬中市盛新氟塑制品有限公司 一种四氟垫片冲压模具
US20190129327A1 (en) * 2017-10-27 2019-05-02 Canon Kabushiki Kaisha Image forming apparatus including optical print head
US10928746B2 (en) * 2017-10-27 2021-02-23 Canon Kabushiki Kaisha Image forming apparatus including optical print head
US11267035B2 (en) * 2018-06-23 2022-03-08 Dongguan University Of Technology Integrated flattening, cutting, and collecting assembly capable of integrity maintenance
CN117102338A (zh) * 2023-10-19 2023-11-24 山东帝盟重工机械有限公司 一种变速箱壳板的冲压装置

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JPWO2004096464A1 (ja) 2006-07-13
EP1621268B1 (en) 2009-12-16
ES2338327T3 (es) 2010-05-06
WO2004096464A1 (ja) 2004-11-11
CN1780704A (zh) 2006-05-31
KR20060003028A (ko) 2006-01-09
DE602004024670D1 (de) 2010-01-28
EP1621268A4 (en) 2007-03-28
JP4556870B2 (ja) 2010-10-06
KR101165391B1 (ko) 2012-07-12
EP1621268A1 (en) 2006-02-01

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