WO2016143495A1 - 打抜き加工方法、プレス成形品の製造方法、及び、プレス成形品 - Google Patents
打抜き加工方法、プレス成形品の製造方法、及び、プレス成形品 Download PDFInfo
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- WO2016143495A1 WO2016143495A1 PCT/JP2016/055087 JP2016055087W WO2016143495A1 WO 2016143495 A1 WO2016143495 A1 WO 2016143495A1 JP 2016055087 W JP2016055087 W JP 2016055087W WO 2016143495 A1 WO2016143495 A1 WO 2016143495A1
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- punching
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- matching portion
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- 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
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- 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
- B21D19/00—Flanging or other edge treatment, e.g. of tubes
- B21D19/005—Edge deburring or smoothing
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- 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
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- 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
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- 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
- B21D28/265—Perforating, i.e. punching holes in sheets or flat parts with relative movement of sheet and tools enabling the punching of holes in predetermined locations of the sheet, e.g. holes punching with template
Definitions
- the present invention is, for example, a punching method for sequentially performing a plurality of stages of punching with a punch and a die on a metal plate-like material using a progressive press die, a method for manufacturing a press-formed product, and a press. It is related to molded products, and in particular, a technique that can suppress the formation of burrs at the locations where the punched surfaces formed on the plate-shaped material intersect each other and the generation of metal powder there by multiple stages of punching This is a proposal.
- the manufacture of the connector terminal is generally performed by a high-speed press using a progressive die.
- a progressive die for example, a long strip-shaped metal plate-like material is intermittently fed in one direction, and the plate-like material is punched to extract a predetermined contour shape.
- Connector terminals and other press-molded products are manufactured through a punching process and subsequent processes for performing imposition and bending as required.
- each of the punching surfaces formed by the preceding punching process performed first and the subsequent punching process performed later is located adjacent to each other, and the so-called matching portion is called where these punching surfaces intersect. Corners will be formed.
- An object of the present invention is to solve such a problem, and the object of the invention is to generate burrs in a matching portion formed by punching performed in a plurality of stages, and to provide a metal therewith.
- An object of the present invention is to provide a punching method capable of effectively suppressing the generation of powder, a method for producing a press-formed product using the same, and a press-formed product.
- a plate-like member is formed between each of the punching processes to be performed over a plurality of stages, and the former punching surface and the subsequent punching surface that provide the matching portion are formed. It is possible to suppress the occurrence of burrs and metal powder on the matching part by performing swage processing that crushes at least the part where the matching part will be formed after the subsequent punching process in the vicinity of the former punching surface of I found.
- the punching method of the present invention is a punching method in which a plurality of stages of punching and die are sequentially performed on a metal plate-like material, Forming a front punching surface on the sheet material, and then punching the plate material in the subsequent punching process so that it intersects the front punching surface, thereby forming the rear punching surface on the plate material,
- the matching portion forming portion is subjected to a swaging process that sandwiches and crushes the plate-like material from the front side and the back side.
- the matching portion forming portion of the plate-shaped material is the position of the plate-shaped material. It is preferable to press and crush from the back side opposite to the front side.
- the processing rate of the swaging is preferably 30% to 90% with respect to the thickness direction of the plate-like material.
- the processing rate is expressed as a ratio of the thickness of the matching portion forming portion decreased after swaging to the thickness of the matching portion forming portion before swaging.
- the manufacturing method of the press-formed product of this invention uses any of the above punching methods.
- the press-formed product of the present invention is manufactured by the above manufacturing method.
- the matching part forming portion of the plate-like material is sandwiched and crushed from the front side and the back side of the plate-like material by swaging before the subsequent stage punching process.
- the properties of the front punched surface at the matching portion forming portion of the front punched surface are adjusted, whereby the occurrence of burrs can be effectively suppressed in the matching portion formed by subsequent post punching.
- generation of metal powder due to peeling of burrs or the like can also be suppressed.
- FIG. 5 is an enlarged cross-sectional view taken along line VII-VII in FIG. It is a figure similar to FIG. 5 which shows the matching part of the press-molded product shape
- a plurality of punching processes using a punch and a die are sequentially performed on a metal plate-like material.
- each of the post-stage punching processes performed in a direction intersecting with the direction of the pre-stage punching process after the pre-stage punching process forms a front-stage punched surface and a post-stage punched surface intersecting with the plate-like material. It is assumed that a corner portion called a matching portion is formed at a location where the punching surface and the subsequent punching surface intersect.
- other punching processes and other processes can be performed before and after the former punching surface and after the subsequent punching process, and other processes can be performed between the former punching process and the subsequent punching process. is there.
- the punching method of the present invention for example, to produce connector terminals and the like, mainly with a progressive press mold, while feeding the plate-like material intermittently in one direction, with respect to the plate-like material, although it can be effectively used in a high-speed press that forms a plate-shaped material into a predetermined shape by performing a plurality of stages of punching and imposing or bending as required, the description is simplified or not described here.
- a case will be described as an example where circular punching is performed in a two-stage manner in plan view on a stationary plate-like material.
- FIG. 1 (a) shows the plate-like material 1a after the previous punching process in which a plate-like material sandwiched between a punch and a die (not shown) is punched into a circular shape by a punch in plan view.
- a pre-stage punching surface 2 that draws a circular shape in a plan view is formed around a disk-shaped space from which the plate-like material 1a is extracted.
- a punch of the same size and shape is used to place the front stage in a position slightly shifted from the front stage punching surface 2 to the right side of the drawing as shown by a virtual line in FIG.
- Post-stage punching is carried out to punch a circle so as to intersect with the punching process.
- FIG. 1 (b) a press-formed product in which a similar arc-shaped rear punching surface 3 is formed adjacent to and continuous with the arc-shaped front punching surface 2 in a plan view as shown in FIG. 1 (b). 1b is obtained.
- latter stage punching process makes a crescent-shaped planar outline shape, as shown in FIG.
- the press-formed product 1b has, as shown in an enlarged plan view in FIG. 3, a portion where the front punching surface 2 and the rear punching surface 3 intersect,
- the matching part 5 is formed as a corner part slightly protruding to the side.
- the front punching surface 2 and the rear punching surface 3 intersect at two upper and lower positions in FIG. 3, and two matching portions 5 are formed in each of them.
- the matching portion 5 is widely known in the art as generating molding defects such as the occurrence of burrs protruding toward the front side or the back side of the press-formed product 1b and metal powder that can be peeled off. ing.
- the portion adjacent to the punch of the rear punching process on the front punching surface 2 formed by the previous punching process is dragged by the part (scrap 4) punched thereby.
- the part (scrap 4) punched thereby By plastic deformation, it becomes a burr protruding to the front surface side or the back surface side, and it is thought that the metal powder is generated when the protruding portion deformed by the plastic deformation is scraped with a punch for subsequent punching.
- the plate-like material 1 a is after the former punching process and before the subsequent punching process. Is swaged. More specifically, in this swaging process, after the former punching surface 2 is formed on the plate-like material 1a by the former punching process, prior to the subsequent punching process, at least by the former punching surface 2 and the latter punching process.
- FIG. 4B not only the matching portion forming portion 5a but also the entire edge facing the void including the front punching surface 2 is crushed.
- the front-stage punching surface 2 and the rear-stage punching surface 3 having good surface properties at the matching portion 5 are formed as illustrated in FIG. be able to.
- the front punched surface 2 and the rear punched surface 3 are respectively sheared surface regions 2a and 3a located on the front surface TS side of the press-formed product 1b and fractured surface regions 2b and 3b located on the back surface BS side.
- These shear surface regions 2a, 3a and fracture surface regions 2b, 3b extend side by side in the longitudinal direction of the front punching surface 2 and the rear punching surface 3 (left and right in FIG. 5). Yes.
- the shear surface area is considered to be formed by rubbing against the punch or die when the plate-like material is stretched in the thickness direction by punching, and includes a slight linear pattern in the thickness direction. It becomes a smooth surface.
- the fractured surface region is considered to be caused by being torn off from the scrap to be discharged after being stretched by punching, and is clearly different from the sheared surface region, and becomes a dimple-like surface having unevenness.
- the shear surface region 3 a on the surface TS side of the rear punching surface 3 gradually expands toward the fractured surface region 3 b as it approaches the matching portion 5 in the longitudinal direction, and the matching portion 5, the length in the thickness direction (vertical direction in FIG. 5) is longer than the other parts, but it does not expand to the fractured surface region 3b side so as to reach the back surface BS side.
- the burr at the matching portion is usually caused by the shear surface region extending beyond the back surface to the fracture surface region side and protruding from the back surface. In this embodiment, such a burr is not generated.
- FIG. 6 is a view similar to FIG. 5 showing a press-formed product 51b formed by a conventional method in which a two-stage punching process is similarly performed except that the above-described swaging process is not performed. .
- the shear surface area 53 a of the post-stage punching surface 53 formed by the post-stage punching is the matching portion 55 on the fracture surface area 53 b side.
- burrs B protruding from the back surface BS are formed.
- the plate-like material 1a is formed into a plate shape by the pressing member 20 or the like of the swaging means shown by the phantom line in FIG. It is preferable to crush the material 1a.
- the matching part forming portion is formed in the plate-like shape by the pressing member. It is preferable to crush from the surface side of the material. That is, it is preferable to press with a pressing member by swage processing from the surface opposite to the surface that presses the punch in post-stage punching processing. In addition, it is also possible to press with a pressing member from both the front surface side and the back surface side of the plate-like material.
- the matching portion forming portion 5a when crushing the matching portion forming portion 5a of the plate-like material 1a by swaging, the matching portion forming portion 5a is pressed in the thickness direction rather than being pressed in a direction parallel to the thickness direction of the plate-like material 1a. It is preferable to press the matching portion forming portion 5a in the inclined direction.
- the contact surface of the pressing member 20 of the swaging means with the matching portion forming portion 5 a is inclined at a predetermined inclination angle ⁇ with respect to the front surface TS or the back surface BS of the plate-like material 1 a.
- Contact surface When the pressing member 20 is displaced along the thickness direction as indicated by the white arrow in FIG. 7 and the pressing member 20 presses the plate-like material 1a, the inclined contact surface of the pressing member 20 is In the pressing direction inclined with respect to the thickness direction, the pressing force PF is applied to the matching portion forming portion 5a, particularly the boundary portion between the back surface BS and the front punching surface 2.
- a shape that follows the inclined contact surface of the pressing member 20 is formed at the boundary portion between the back surface BS and the front punching surface 2 in the crushed matching portion forming portion 5a.
- the fractured surface regions 2b and 3b are inclined at a predetermined angle ⁇ with respect to the back surface BS in the matching portion 5 of the press-formed product 1b.
- the spread of the shear surface areas 2a and 3a toward the fracture surface areas 2b and 3b is suppressed, and the generation of burrs can be prevented.
- the inclined contact surface of the pressing member 20 of the swage processing means that contacts the matching portion forming portion 5a is a flat surface shape as shown in FIG. It is also possible to have a curved surface that is recessed inward. Further, the pressing member 20 of the swaging means is displaced as shown by the white arrow in FIG. 7, and when the plate-like material 1a is crushed, the displacement is stopped from the position where the pressing member 20 contacts the plate-like material 1a. The pressing member 20 can be displaced by a predetermined displacement amount until it is made.
- the processing rate which is the ratio of the thickness of the matching portion forming portion 5a where the thickness is reduced after the swaging process is finished, is 15% with respect to the thickness t of the matching portion forming portion 5a of the plate-like material 1a before the swaging processing. It is preferable to control the above-mentioned displacement amount so as to be ⁇ 90%. More preferably, the processing rate is 30% to 85%.
- the back surface BS in the matching portion 15 and the fracture surface area 12 b on the front punching surface 12 side are formed.
- a press-formed product 11b having a small angle ⁇ can also be manufactured.
- the angle ⁇ formed between the back surface BS and the fractured surface region 12b in the matching portion 15 is smaller than that shown in FIG. Yes.
- the inclination angle ⁇ of the inclined contact surface in swaging is preferably set to 30 ° to 85 °, for example. This is because the generation of burrs and the generation of metal powder at the matching portion 15 of the press-formed product 11b to be manufactured can be prevented more reliably.
- the angle ⁇ between the back surface BS in the matching portion 15 and the fracture surface region 12b on the front punching surface 12 side is 30 ° to 85 °.
- This angle ⁇ coincides with the inclination angle ⁇ of the inclined contact surface of the pressing member 20 in swaging.
- a point A1 where the fracture surface area 12b of the front punched surface 12 in the vicinity of the matching portion 15 subjected to the swaging process intersects with the back surface BS.
- the straight line connecting the point A2 where the fracture surface region 12b and the shear surface region 12a intersect can be measured by measuring the angle at which the straight line is inclined with respect to the back surface BS.
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Abstract
Description
かかる順送金型では、内部で、たとえば、長尺帯状の金属製の板状材料を、一方向に向けて間欠的に送りつつ、板状材料に打抜き加工を施して、所定の輪郭形状を抜き出す打抜き工程及び、その後に、所要に応じて面付け加工や曲げ加工を施す各工程を経て、コネクタ端子その他のプレス成形品が製造される。
この場合においては、前記スエージ加工で、前記マッチング部形成箇所の、前記裏面と前段打抜き面との境界部分を、板状材料の表面および裏面に対し、30°~85°で傾斜した傾斜接触面により押圧して押し潰すことがより好ましい。
そしてまた、この発明のプレス成形品は、上記の製造方法により製造されたものである。
この発明の一の実施形態に係る打抜き加工方法では、金属製の板状材料に対し、パンチ及びダイによる複数段階の打抜き加工を順次に施すに当って、それらの打抜き加工のうち、前段打抜き加工及び、その前段打抜き加工よりも後に前段打抜き加工の向きと交差する向きに行う後段打抜き加工のそれぞれにより、板状材料に、前段打抜き面と、それに交差する後段打抜き面が形成されるとともに、前段打抜き面と後段打抜き面とが交わる箇所に、マッチング部と称される角部が形成されることを前提とする。
なお、前段打抜き面よりも前や後段打抜き加工の後に、他の打抜き加工その他の加工を行うことができることは勿論、前段打抜き加工と後段打抜き加工の間に、他の加工を行うことも可能である。
この前段打抜き加工により、板状材料1aの抜き取られた円盤状の空所の周囲に、平面視で円形状を描く前段打抜き面2が形成される。
後段打抜き加工により、図1(b)に示すように、平面視で円弧状の前段打抜き面2に隣接するとともに連続する、これも同様の円弧状の後段打抜き面3が形成されたプレス成形品1bが得られる。なお、後段打抜き加工により排出されるスクラップ4は、図2に示すように三日月状の平面輪郭形状をなす。
このマッチング部5は、プレス成形品1bの表面側ないし裏面側に向けて突き出るバリの発生等の成形上の不良や、バリが引き剥がれてできる金属粉を発生させるものとして当業界では広く知られている。具体的には、後段打抜き加工の最中に、前段打抜き加工により形成された前段打抜き面2上で後段打抜き加工のパンチに近接する部分が、それにより打ち抜かれる部分(スクラップ4)に引き摺られて塑性変形することにより、表面側ないし裏面側に突き出るバリとなり、また、その塑性変形して突き出た部分が後段打抜き加工のパンチで削られることにより、金属粉が発生すると考えられる。
より詳細には、このスエージ加工では、前段打抜き加工により、板状材料1aに前段打抜き面2が形成された後、後段打抜き加工を行うに先立って、少なくとも、前段打抜き面2と後段打抜き加工による後段打抜き面3とが交わることになる箇所、言い換えれば、後段打抜き加工後にマッチング部5が形成されることになるマッチング部形成箇所5aを、板状材料1aの表面側及び裏面側から挟み込んで押し潰す。なおこの実施形態では、図4(b)に仮想線で示すように、マッチング部形成箇所5aのみならず、前段打抜き面2を含む空所に臨む縁部全体を押し潰している。
図5に示すところでは、前段打抜き面2及び後段打抜き面3はそれぞれ、プレス成形品1bの表面TS側に位置するせん断面領域2a、3aと、裏面BS側に位置する破断面領域2b、3bの二層で構成されており、それらのせん断面領域2a、3a及び破断面領域2b、3bは、前段打抜き面2及び後段打抜き面3の長手方向(図5では左右方向)に並んで延びている。
その後、この実施形態では、後段打抜き加工の後に、プレス成形品1bのマッチング部5で、破断面領域2b、3bが、裏面BSに対して所定の角度θで傾斜することになり、マッチング部5での破断面領域2b、3b側へのせん断面領域2a、3aの拡がりが抑制されて、そこでのバリの発生を防止することができる。
また、スエージ加工手段の押圧部材20は、図7に白抜き矢印で示すように変位させて、板状材料1aを押し潰すに際し、押圧部材20が板状材料1aに接触した位置から変位を停止させるまでの所定の変位量で押圧部材20を変位させることができる。ここでは、スエージ加工前の板状材料1aのマッチング部形成箇所5aの厚みtに対し、スエージ加工が終了して厚みが減少したマッチング部形成箇所5aの厚みの割合である加工率が、15%~90%となるように、上記の変位量を制御することが好適である。より好ましくは、この加工率を、30%~85%とする。
このような角度θを調整するため、スエージ加工での傾斜接触面の傾斜角度αは、たとえば、30°~85°とすることが好ましい。それにより、製造するプレス成形品11bのマッチング部15でのバリの発生、金属粉の発生をさらに確実に防止できるからである。
実施例1~9は、表1に示す条件にて、二段階の打抜き加工の間にスエージ加工を行った。ここで、実施例1及び2は、後段打抜き加工でパンチを押し当てた表面と同じ表面側を、その前段階のスエージ加工で押し潰した。この一方で、実施例3~7は、後段打抜き加工でパンチを押し当てた表面と逆側の裏面側を、スエージ加工で押し潰した。実施例8及び9は、スエージ加工で表面側及び裏面側を同時に押し潰した。
これに対し、比較例1は、スエージ加工を行わなかった。比較例2及び3は、表1に示す各条件で、二段階の打抜き加工を行った後に、スエージ加工を行った。
なお、比較例2および3は、前段打抜き加工および後段打抜き加工を行った後に、スエージ加工を実施したことに起因して、打抜き加工後のプレス成形品の打抜き面が形状不良となった。
1b、11b プレス成形品
2、12 前段打抜き面
2a、12a せん断面領域
2b、12b 破断面領域
3、13 後段打抜き面
3a、13a せん断面領域
3b、13b 破断面領域
4 スクラップ
5、15 マッチング部
5a マッチング部形成箇所
20 スエージ加工手段の押圧部材
α 押圧部材の傾斜接触面の傾斜角度
t 板状材料の厚み
θ マッチング部の裏面と前段打抜き面側の破断面領域とのなす角度
TS 表面
BS 裏面
PF 押圧力
Claims (6)
- 金属製の板状材料に対し、パンチ及びダイによる複数段階の打抜き加工を順次に施す打抜き加工方法であって、前段打抜き加工により、板状材料に前段打抜き面を形成し、その後、後段打抜き加工で、前段打抜き面に交差させて板状材料を打ち抜くことにより、板状材料に後段打抜き面を形成するとともに、板状材料の前段打抜き面と後段打抜き面とが交わる箇所にマッチング部を形成するに当り、
前段打抜き加工の後、後段打ち抜き加工に先立ち、板状材料に対し、前記マッチング部が形成されることになる板状材料のマッチング部形成箇所を、板状材料の表面側及び裏面側から挟み込んで押し潰すスエージ加工を施す打抜き加工方法。 - 後段打抜き加工で、パンチにより板状材料の表面側を押圧するに先立ち、前記スエージ加工で、板状材料の前記マッチング部形成箇所を、板状材料の前記表面側とは逆側の裏面側から押圧して押し潰す請求項1に記載の打抜き加工方法。
- 前記スエージ加工で、前記マッチング部形成箇所の、前記裏面と前段打抜き面との境界部分を、板状材料の表面および裏面に対し、30°~85°で傾斜した傾斜接触面により押圧して押し潰す請求項2に記載の打抜き加工方法。
- スエージ加工前のマッチング部形成箇所の厚みに対する、スエージ加工後のマッチング部形成箇所の厚みの割合で表される加工率を、30%~90%の範囲とする請求項1~3のいずれか一項に記載の打抜き加工方法。
- 請求項1~4のいずれか一項に記載の打抜き加工方法を用いて、プレス成形品を製造するプレス成形品の製造方法。
- 請求項5に記載のプレス成形品の製造方法により製造されたプレス成形品。
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