EP3320997A1 - Dispositif de moulage de saillie, procédé de moulage de saillie et article moulé - Google Patents

Dispositif de moulage de saillie, procédé de moulage de saillie et article moulé Download PDF

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Publication number
EP3320997A1
EP3320997A1 EP16821299.1A EP16821299A EP3320997A1 EP 3320997 A1 EP3320997 A1 EP 3320997A1 EP 16821299 A EP16821299 A EP 16821299A EP 3320997 A1 EP3320997 A1 EP 3320997A1
Authority
EP
European Patent Office
Prior art keywords
protrusion
punch
die
workpiece
unit
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.)
Pending
Application number
EP16821299.1A
Other languages
German (de)
English (en)
Other versions
EP3320997A4 (fr
Inventor
Shinnosuke NISHIJIMA
Kouki Tomimura
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.)
Nippon Steel Corp
Original Assignee
Nisshin Steel 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
Application filed by Nisshin Steel Co Ltd filed Critical Nisshin Steel Co Ltd
Priority claimed from PCT/JP2016/069332 external-priority patent/WO2017006830A1/fr
Publication of EP3320997A1 publication Critical patent/EP3320997A1/fr
Publication of EP3320997A4 publication Critical patent/EP3320997A4/fr
Pending 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
    • B21D28/343—Draw punches
    • 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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/02—Stamping using rigid devices or tools
    • 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
    • B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
    • B21D28/16—Shoulder or burr prevention, e.g. fine-blanking
    • 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
    • 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
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/10—Die sets; Pillar guides
    • B21D37/12—Particular guiding equipment, e.g. pliers; Special arrangements for interconnection or cooperation of dies
    • 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
    • B21D53/00—Making other particular articles
    • B21D53/26—Making other particular articles wheels or the like
    • B21D53/28—Making other particular articles wheels or the like gear wheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/28—Making machine elements wheels; discs
    • B21K1/30—Making machine elements wheels; discs with gear-teeth
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K23/00—Making other articles

Definitions

  • the present invention relates to a protrusion forming device, a protrusion forming method and a formed article.
  • forming is carried out by drawing.
  • drawing requires the distance between a lateral face of a punch and an inner face of a die hole to be at least the sheet thickness.
  • R roundness
  • forming has been performed by half blanking according to the fine blanking method.
  • the fine blanking method is a method of performing shearing with high precision by causing a compressive force to act on the workpiece, thereby causing plastic deformation.
  • the fine blanking method forming is difficult in the case of the height of the protrusion being the sheet thickness or greater. This is because, when the height of the protrusion is the sheet thickness or greater, due to the punch diameter and die hole diameter generally being approximately the same, it is not possible to process by the workpiece being sheared by the shearing force.
  • Patent Document 1 Japanese Patent No. 3339363
  • An object of the present invention is to provide a protrusion forming device, protrusion forming method and formed article for which a height of at least the sheet thickness can be formed, the edges are sharp, and the occurrence of cracking is further prevented.
  • the present invention is a protrusion forming device which includes: a die unit provided with a die hole; and a punch unit having a large punch part that can advance and retreat in a first direction towards the die unit, and is of a size incapable of insertion into the die hole, and a small punch part that projects from the large punch part to a side of the die unit, and is of a size capable of insertion into the die hole, in which the protrusion forming device causes a workpiece to deform by pressing a part of the workpiece arranged between the die unit and the punch unit to a side of the die unit by way of the punch unit.
  • an interval d1 between a lateral face of the small punch part and a lateral face of the large punch part, and an interval d2 between a lateral face of the small punch part and an inner face of the die hole is preferable for an interval d1 between a lateral face of the small punch part and a lateral face of the large punch part, and an interval d2 between a lateral face of the small punch part and an inner face of the die hole to be in a relationship of d2 ⁇ d1.
  • an interval d2 between a lateral face of the small punch part and an inner face of the die hole, and a sheet thickness T of the workpiece is preferable for an interval d2 between a lateral face of the small punch part and an inner face of the die hole, and a sheet thickness T of the workpiece to be in a relationship of d2 ⁇ T.
  • a sloped face which inclines in a direction in which the thickness of the small punch part becomes thinner as approaching a rim part of the small punch part is preferable for a sloped face which inclines in a direction in which the thickness of the small punch part becomes thinner as approaching a rim part of the small punch part to be provided to a bottom face of the small punch part.
  • the present invention is a protrusion forming method including: a placement step of placing a workpiece on a die unit provided with a die hole; and a punching step of forming a protrusion by causing a punch unit, which has a large punch part of a size incapable of insertion into the die hole, and a small punch part that projects from the large punch part to a side of the die unit and is of a size capable of insertion into the die hole, to move in a first direction approaching the side of the die unit, and pressing a part of a workpiece arranged between the die unit and the punch unit to the side of the die unit by way of the punch unit so as to deform the workpiece.
  • an interval d1 between a lateral face of the small punch part and a lateral face of the large punch part, and an interval d2 between a lateral face of the small punch part and an inner face of the die hole is preferable for an interval d1 between a lateral face of the small punch part and a lateral face of the large punch part, and an interval d2 between a lateral face of the small punch part and an inner face of the die hole to be in a relationship of d2 ⁇ d1.
  • an interval d2 between a lateral face of the small punch part and an inner face of the die hole, and a sheet thickness T of the workpiece is preferable for an interval d2 between a lateral face of the small punch part and an inner face of the die hole, and a sheet thickness T of the workpiece to be in a relationship of d2 ⁇ T.
  • the punching step prefferably includes: a first step of forming a protrusion by way of a punch unit provided in which a sloped face that inclines in a direction in which a thickness of the small punch part becomes thinner as approaching a rim part of the small punch part is provided to a bottom face of the small punch part; and a second step of forming a protrusion by way of a punch unit in which the bottom face of the small punch part is a level surface.
  • the present invention is also a formed article including: a flat part of thickness T; and a protrusion that projects from a side of one surface of the flat part, in which a first concave part having a first width S1, and a second concave part formed by further indenting from the first concave part and having a second width S2, are formed on a side of another surface of the protrusion of the formed article, and a thickness d2 of a side wall part of the second concave part, and the thickness T of the flat part satisfy the relationship of d2 ⁇ T.
  • the formed article can be formed such that H ⁇ T, when defining a height H as a height from the one surface of the flat part until a top face of the side of the one surface of the protrusion.
  • a width S1 of the first concave part, width S2 of the second concave part, and width S3 of the protrusion at the side of the one surface is preferable for a width S1 of the first concave part, width S2 of the second concave part, and width S3 of the protrusion at the side of the one surface to satisfy the relationship of S2 ⁇ S3 ⁇ S1.
  • protrusion forming device protrusion forming method and formed article for which a height of at least the sheet thickness can be formed, the edges are sharp, and the occurrence of cracking is further prevented.
  • the protrusion forming device 1 is a device that forms a protrusion in a sheet-like workpiece W such as a steel sheet, with FIG.1A showing a state prior to forming of a protrusion W1 arranging the workpiece W in the protrusion forming device 1, and FIG. 1B being a schematic drawing showing a state of forming the protrusion W1 in the workpiece W1 arranged in the protrusion forming device 1.
  • the protrusion forming device 1 of the present embodiment is a device used upon forming a protrusion W1 in a sheet gear such as that shown in FIG. 2 , for example.
  • FIG.2A is a photograph viewing from below a sheet gear in which a downward protrusion W1 is provided
  • FIG.2B is a photograph viewing from above a sheet gear in which the downward protrusion W1 is provided.
  • the surface area on a side contacting with a die hole 12a of the protrusion W1 it is preferable for the surface area on a side contacting with a die hole 12a of the protrusion W1 to be larger.
  • the protrusion forming device 1 includes a fixed part 10, a moving part 30 that moves vertically relative to the fixed part 10, and a pressing part 50 that is retained by the moving part 30, and further moves relative to the moving part 30.
  • vertical is the direction of the arrows shown in FIG. 1 , and hereinafter in the present disclosure, the direction in which the moving part 30 approaches the fixed part 10 is referred to as down (first direction), and the direction in which the moving part 30 distances from the fixed part 10 is referred to as up.
  • the fixed part 10 includes a die holder 11, die unit 12, and guide posts 13.
  • the die holder 11 is produced from a substantially rectangular thick-plate member. It should be noted that the shape of the die holder 11 is not limited to a rectangle. A through-hole 11a is provided in the central part of the die holder 11.
  • the guide posts 13 extend from the outer circumferential part of the die holder 11 towards up in the drawings.
  • Four of the guide posts 13 are provided in the present embodiment, for example.
  • the die unit 12 is arranged more inwards than the guide posts 13 on the top face of the die holder 11, and is fixed to the die holder 11.
  • the die unit 12 is a metallic member of constant thickness, and a die hole 12a corresponding to the shape of the protrusion W1 formed by the protrusion forming device 1 is provided in the central part thereof.
  • a lower die 20 which is substantially the same shape and same size as the die hole 12a, and decides the height of the protrusion W1, is arranged inside of the die hole 12a.
  • the upper end of a rod-shaped knockout member 21 for discharge of the workpiece W is mounted to the bottom face of the lower die 20.
  • the lower end of the knockout member 21 extends downwards from the aforementioned through-hole 11a provided in the die holder 11, and is joined to a drive mechanism that is not illustrated.
  • the drive mechanism presses the lower die 20 upwards via the knockout member 21.
  • the moving part 30 includes a punch holder 31, backing plate 32, guide pin 36, and punch unit 40.
  • the punch holder 31 is produced from a thick-plate member of substantially the same size as the die holder 11.
  • a first through-hole 31a is provided at a position corresponding to the aforementioned guide post 13.
  • a guide bushing 31c is inserted and fixed to the first through-hole 31a.
  • the guide bushing 31c is a cylindrical member, and extends to below the punch holder 31.
  • the guide post 13 is inserted inside of the guide bushing 31c, and stable vertical motion of the moving part 30 relative to the fixed part 10 is ensured by the guide bushing 31c moving along the outer circumference of the guide post 13.
  • a plurality of second through-holes 31b is provided.
  • the backing plate 32 is mounted more to the inner side than the position at which the guide bushing 31c is provided at the bottom face of the punch holder 31.
  • a two-stage hole 33 continuing from the second through-hole 31b is provided.
  • the two-stage hole 33 includes a first hole 33a having the same axis line as the second through-hole 31b, continues from the second through-hole 31b, and of the same diameter as the second through-hole 31b; and a second hole 33b having the same axis line as the second through-hole 31b, provided further downwards than the first hole 33a, and of a smaller diameter than the first hole 33a.
  • the guide pin 36 is mounted to the bottom face of the backing plate 32 more to the outer circumferential side than the two-stage hole 33, and extends toward below the backing plate 32.
  • the punch unit 40 is fixed to the bottom face of the backing plate 32 at a central part thereof.
  • the punch unit 40 includes a large punch part 41 on the side of the backing plate 32, and a small punch part 42 on the side of the workpiece W.
  • the pressing part 50 includes a bolt member 34, presser plate 37, and coil spring 35.
  • the bolt member 34 has a head part 34a that is smaller than the diameters of second through-hole 31 and first hole 33a, and larger than the diameter of the second hole 33b, and an extending part 34b having a smaller diameter than the diameter of the second hole 33b.
  • the bolt member 34 with the head part 34a up, has the extending part 34b inserted inside of the second through-hole 31b, first hole 33a and second hole 33b, and is screw clamped to the presser plate 37.
  • the coil spring 35 is arranged at a portion of the bolt member 34 which projects from the backing plate 32 (bolt member 34 is inserted into the coil spring 35).
  • the presser plate 37 is arranged at the outer circumferential side of the punch unit 40.
  • the presser plate 37 is a thick-plate member, in which a first opening 37a is formed in the central part thereof, and this first opening 37a is substantially the same diameter as the large punch part 41 of the punch unit 40, and the large punch part 41 can slide within the first opening 37a.
  • a bottomed threaded part 37b for bolt fixing is provided at an outer circumferential side of the first opening 37a on the top face of the presser plate 37.
  • the threaded part 37b is provided at a position corresponding to the extending part 34b of the aforementioned bolt member 34, and a front end of the extending part 34b is inserted and fixed to this threaded part 37b.
  • the coil spring 35 is arranged between the backing plate 32 and presser plate 37 on the outer circumference of the extending part 34b.
  • a second opening 37c is provided at a position corresponding to the aforementioned guide pin 36 on the outer circumferential side of the first opening 37a on the presser plate 37.
  • the guide pin 36 is inserted into the second opening 37c.
  • the lower end of the guide pin 36 is further inserted into the guide hole 12b of the die unit 12, and the guide pin 36 is guided straight ahead by the guide hole 12b in the die unit 12 and the second opening 37c.
  • the workpiece W is arranged on the die unit 12.
  • the workpiece W is a hot-rolled steel sheet (SPFH590) for automobiles, for example.
  • the workpiece W is arranged on the die unit 12. At this time, the protrusion forming location on the workpiece W is aligned so as to position on the die hole 12a.
  • the moving part 30 of the protrusion forming device 1 is positioned more upwards than the state in FIG.1A .
  • the moving part 30 is made to descend by the drive mechanism (not illustrated), whereby the presser plate 37 is made to abut the workpiece W.
  • the moving part 30 is made to descend, and the bottom face of the small punch part 42 of the punch unit 40 is then made to abut the workpiece W as shown in FIG.1A .
  • the moving part 30 is further pressed downwards by the drive mechanism.
  • the punch unit 40 thereby further descends, and presses the workpiece W by the small punch part 42 and large punch part 41.
  • the moving part 30 is made to ascend, whereby the small punch part 42 and large punch part 41 are made to distance from the workpiece W, and the lower die 20 is pushed up by the knockout member 21.
  • FIG. 3 is an enlarged view of the part A in FIG.1B , after forming of the protrusion W1.
  • FIG. 4 is a partial cross-sectional view of the formed article W01 after forming of the protrusion W1.
  • a width S1 of the large punch part 41, a width S2 of the small punch part 42, and a width S3 of the die hole 12a have the relationship of S 2 ⁇ S 3 ⁇ S 1
  • the interval d2 between the lateral face of the small punch part 42 and inner face of the die hole 12a when inserted into the die hole 12a is less than the sheet thickness T of the workpiece W. T > d 2
  • the formed article W01 when viewing as the formed article W01, the formed article W01 includes a flat part W2 of thickness T, the protrusion W1 of thickness T projecting to the lower side in FIG. 4 from the side of one surface A of the flat part W2, and a rising part P2 which rises up from the flat part W2 to the protrusion W1 .
  • the interval d2 between the lateral face of the small punch part 42 and inner face of the die hole 12a when inserted into the die hole 12a is also referred to as the thickness d2 of the rising part P2 in a direction orthogonal to the thickness T direction of the flat part W2, and satisfies the relationship of T > d 2 as mentioned above.
  • the height H from the one surface A of the flat part W2 until one surface B of the protrusion W1 can satisfy the relationship of H ⁇ T
  • the concave part has a first concave part D1 having a first width S1 that is roughly the same as the width S1 of the large punch part 41, and a second concave part D2 that is formed by further indenting from the first concave part D1, and has a second width S2 that is roughly the same as the width S2 of the small punch part 42.
  • the width of the protrusion W1 on the side of the surface B is equal to the width S3 of the die hole 12a, and satisfies the relationship of S 2 ⁇ S 3 ⁇ S 1 as mentioned above.
  • FIG. 5 is a view showing a comparative embodiment.
  • FIG. 5A shows a state arranging the workpiece W on the die unit 12A of the comparative embodiment
  • FIG. 5B shows a state of forming the protrusion W1 in the workpiece W by causing a punch unit 40A of the comparative embodiment to descend.
  • the punch unit 40A of the comparative embodiment does not have the large punch part as shown in the illustration, and only has a small punch 42A.
  • interval d2 between the lateral face of the small punch part 42 and inner face of the die hole 12a in the comparative embodiment is no more than the sheet thickness T of the workpiece W.
  • the punch unit 40A when causing the punch unit 40A to descend from the state of FIG.5A , the punch unit 40A (small punch 42A) presses the workpiece W as shown in FIG. 5B .
  • the punch unit 40 of the present embodiment is a two-stage structure of the large punch part 41 and small punch part 42, as shown in FIG. 3 .
  • the portion of the workpiece W that existed in the portion indicated by reference symbol B in FIG. 3 is pressed downwards by the large punch part 41 upon forming the protrusion W1.
  • the material of this part B flows to other portions as shown by the arrows in FIG. 3 .
  • the material is pressed and flows, whereby material supply is performed to portions on which tensile force acts, and the tensile force is alleviated.
  • this pressed portion is forged and the hardness increases.
  • FIG. 6 is a graph showing the results of measuring the hardness of portions P1 to P4 in FIG. 3 of the workpiece W formed in the present embodiment.
  • the position indicated by the dotted line is the hardness 197 HV of the workpiece W itself. According to the present embodiment, it is hardened at all of portions P1 to P4, and thus an improvement in product strength is also possible.
  • R at the corner of the workpiece W after forming becomes sharp (corner sag hardly occurs), due to the protrusion W1 also having a deformed shape due to shear. Therefore, it is possible to form detailed concavities and convexities.
  • the material having flowed from the portion B not only causes the hardness to rise, by flows to other portions of the workpiece W. Due to this flow, it is possible to ensure a predetermined thickness at the portions of P2 and P3, which are the rising parts of the protrusion W1.
  • this flowed material is pushed into the corner C1 between the large punch part 41 and small punch part 42 of the workpiece W, and the corner C2 between the lower die 20 and lateral side of the die hole 12a; therefore, R at the corner of the workpiece after formed becomes sharper (corner sag hardly occurs). Therefore, it is possible to form more detailed concavities and convexities.
  • the edge of the protrusion W1 becomes sharp in this way, the surface area of the portion of the protrusion W1 contacting with the die hole 12a becomes larger. For this reason, in the case of causing the protrusion W1 to contact another member to cause the workpiece W to rotate, it is possible to produce a large rotary torque. Therefore, it is suited to the production of protrusions such as sheet gears.
  • FIG. 7 is a view showing a second embodiment of the present invention, and corresponds to FIG. 3 of the first embodiment.
  • FIG. 8 is a partial cross-sectional view of a formed article W02 after processing according to the second embodiment.
  • a point by which the present embodiment differs from the first embodiment is the point of a sloped face 42a which inclines in a direction in which the thickness of the small punch part 42 becomes thinner as approaching the rim part of the small punch part 42 is provided to the bottom face of the small punch part 42.
  • the material that existed at the part D of the workpiece W at which the sloped face 42a is positioned tends to flow in the directions indicated by the arrows in the drawing.
  • the flowed material flows to other portions of the workpiece W.
  • This flowed material is pushed into the corner C1 between the large punch part 41 and small punch part 42 of the workpiece W, and corner C2 between the lower die 20 and lateral face of the die hole 12a, whereby R of the corner of the workpiece W after forming (formed article W02) becomes even sharper. Therefore, it is possible to form more detailed concavities and convexities.
  • the edge of the protrusion W1 becomes sharp in this way, the surface area of the portion of the protrusion W1 contacting with the die hole 12a becomes larger. For this reason, in the case of causing the protrusion W1 to contact another member to cause the workpiece W to rotate, it is possible to produce a larger rotary torque.
  • a third embodiment is a method of forming the protrusion W1 in the workpiece W by the protrusion forming device 1 of the second embodiment shown in FIG. 7 , and then further forming the protrusion W1 more sharply by further pressing the workpiece W, by the protrusion forming device 1 of the first embodiment shown in FIG. 3 .
  • the material of the surface of the workpiece W is made to flow to the outer side of the small punch part 42 by way of the sloped face 42a.
  • FIG. 9 is a view showing a fourth embodiment of the present invention, and corresponds to FIG. 3 of the first embodiment.
  • FIG. 10 is a partial cross-sectional view of a formed article W04 after processing in the fourth embodiment.
  • the point whereby the punch unit 40 of the protrusion forming device 1 of the present embodiment differs from the first embodiment is the point in which a projection 43 along the outer circumference of the small punch part 42 is provided at an end of an surface of the small punch part 42 on the side of the workpiece 42.
  • the projection 43 is being provided, it is possible to reduce the pressing weight more than pressing by the entirety of the bottom face of the punch unit 40 during forming.
  • the material that existed at part E of the workpiece W at which the projection 43 is positioned tends to flow in the directions indicated by the arrows in the drawing, due to the projection 43 being provided.
  • the flowed material not only causes the hardness to rise, but also flows to other portions of the workpiece W.
  • This flowed material is pushed into the corner C1 between the large punch part 41 and small punch part 42 of the workpiece W, and the corner C2 between the lower die 20 and the lateral face of the die hole 12a, whereby R of the corner of the workpiece W after forming becomes even sharper. Therefore, it is possible to form more detailed concavities and convexities.
  • the edge of the protrusion W1 becomes sharp in this way, the surface area of the portion of the protrusion Wlcontacting with the die hole 12a becomes larger. For this reason, in the case of causing the protrusion W1 to contact another member to cause the workpiece W to rotate, it is possible to produce a large rotary torque.
  • a load was applied using a knuckle press machine capable of applying a maximum load of 400 tons to the protrusion forming device 1.
  • the workpiece W was SPFH590, which is hot-rolled sheet steel, and the mechanical properties used YS (yield stress) 522 MPa, TS (tensile strength) 604 MPa, EL (elongation) 26%, and two types of sheet thickness of 2.9 mm and 2.5 mm.
  • FIG. 3 shows at which portions each of (1) protrusion height (H), (2) width-direction remaining sheet thickness (interval d2 between lateral face of small punch part and inner face of die hole), (3) sheet thickness-direction remaining sheet thickness, (4) 45° direction remaining sheet thickness, and (5) corner sag are.
  • protrusion W1 for which (1) protrusion height H is at least the sheet thickness T (H ⁇ T) indicated by Formula (4), for both the cases of the sheet thickness of the workpiece W being 2.9 mm and 2.5 mm.
  • the protrusion W1 in a state in which a predetermined thickness was ensured in the range of no more than the sheet thickness T of the workpiece W, at (2) width-direction remaining sheet thickness d2, (3) sheet-thickness direction remaining sheet thickness and (4) 45° direction remaining sheet thickness, for both the cases of the sheet thickness of the workpiece W being 2.9 mm and 2.5 mm.
  • the third embodiment having further formed the protrusion W1 based on the first embodiment could form a sharper protrusion W1 having less corner sag.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Forging (AREA)
EP16821299.1A 2015-07-07 2016-06-29 Dispositif de moulage de saillie, procédé de moulage de saillie et article moulé Pending EP3320997A4 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2015135834 2015-07-07
JP2016124835A JP6673760B2 (ja) 2015-07-07 2016-06-23 突起部成形装置、突起部成形方法
PCT/JP2016/069332 WO2017006830A1 (fr) 2015-07-07 2016-06-29 Dispositif de moulage de saillie, procédé de moulage de saillie et article moulé

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Publication Number Publication Date
EP3320997A1 true EP3320997A1 (fr) 2018-05-16
EP3320997A4 EP3320997A4 (fr) 2019-02-20

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EP16821299.1A Pending EP3320997A4 (fr) 2015-07-07 2016-06-29 Dispositif de moulage de saillie, procédé de moulage de saillie et article moulé

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CN113751649B (zh) * 2021-08-30 2023-08-08 舟山市7412工厂 一种用于零件镦深孔的冷镦模具

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JP2017019015A (ja) 2017-01-26
CN107921521A (zh) 2018-04-17
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JP6673760B2 (ja) 2020-03-25
TW201706048A (zh) 2017-02-16

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