JP3636964B2 - Counterbore forming method and press apparatus for thick sheet metal - Google Patents

Counterbore forming method and press apparatus for thick sheet metal Download PDF

Info

Publication number
JP3636964B2
JP3636964B2 JP2000134872A JP2000134872A JP3636964B2 JP 3636964 B2 JP3636964 B2 JP 3636964B2 JP 2000134872 A JP2000134872 A JP 2000134872A JP 2000134872 A JP2000134872 A JP 2000134872A JP 3636964 B2 JP3636964 B2 JP 3636964B2
Authority
JP
Japan
Prior art keywords
punch
sheet metal
counterbore
thick sheet
recess
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.)
Expired - Fee Related
Application number
JP2000134872A
Other languages
Japanese (ja)
Other versions
JP2001314925A (en
Inventor
高秀 木野
剛志 森下
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.)
NEC AccessTechnica Ltd
Original Assignee
NEC AccessTechnica 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 NEC AccessTechnica Ltd filed Critical NEC AccessTechnica Ltd
Priority to JP2000134872A priority Critical patent/JP3636964B2/en
Publication of JP2001314925A publication Critical patent/JP2001314925A/en
Application granted granted Critical
Publication of JP3636964B2 publication Critical patent/JP3636964B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Landscapes

  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、厚肉板金に座ぐりを形成するための座ぐりの形成方法および座ぐり形成用のプレス装置に関するものである。
【０００２】
【従来の技術】
一般に、厚肉板金に、たとえば、ボルト挿通用の貫通孔を形成するとともに、この貫通孔まわりに、前記ボルトあるいはこのボルトに螺着されるナット等の座りをよくするために、座ぐりを形成することが行われている。
【０００３】
そして、前記座ぐりを形成するための一従来例として、前記貫通孔を形成した後に、この貫通孔よりも大きな外径を有する第２パンチを用いて、前記厚肉板金を所定深さまで塑性変形させて座ぐりを形成することが挙げられる。
しかしながら、前述したように、厚肉板金であると、前記座ぐりを一工程のプレス成形によって形成しようとすると、多大な圧力を必要とし、この結果、プレス装置が大型化するといった問題点がある。
【０００４】
そこで、前記第２パンチによるプレス工程を、複数回に分けて行うことにより、各工程におけるプレス力を軽減する方法が試みられている。
【０００５】
【発明が解決しようとする課題】
ところで、前述したように、第２パンチによるプレス工程を複数に分けて実施する場合、つぎのような改善すべき問題点が生じる。
すなわち、２回目以降のプレス工程の際に、第２パンチと先に形成されている凹部との位置合わせを高精度に行わないと、前記第２パンチが凹部の開口縁部に衝突して第２パンチに損傷を与えることが想定されるという問題点である。
また、先に形成されている凹部と第２パンチとに位置ずれが生じた場合、次工程のプレスによって前記凹部が拡大されてしまい、座ぐりの寸法精度が低下するといった問題点も想定される。
【０００６】
本発明は、このような従来の問題点に鑑みてなされたもので、プレスに要する動力の増加を小さく抑え、かつ、高い寸法精度が得られる厚肉板金における座ぐりの形成方法およびプレス装置を提供することを目的とするものである。
【０００７】
【課題を解決するための手段】
本発明の請求項１に記載の厚肉板金における座ぐりの形成方法は、前述した目的を達成するために、厚肉板金に貫通孔を形成し、前記厚肉板金の前記貫通孔の端部側の表面に座ぐりを形成するための方法であって、前記貫通孔の内径と同一外径を有する第１パンチと、形成すべき座ぐりの内径よりも大きな外径を有する第２パンチと、形成すべき座ぐりの内径とほぼ同等の外径を有する第３パンチとを用い、前記厚肉板金を前記第１パンチによって打ち抜くことにより前記貫通孔を形成し、前記第２パンチを、前記貫通孔と同軸上に設置するとともに、この第２パンチにより前記厚肉板金を所定深さまで塑性変形させて第１の凹部を形成し、ついで、前記第３パンチを前記第１の凹部と同軸上に設置するとともに、この第３パンチにより、前記第１の凹部の底面を所定深さまで塑性変形させることにより第２の凹部を形成して座ぐりを形成することを特徴とする。
本発明の請求項２に記載の厚肉板金における座ぐりの形成方法は、請求項１に記載の前記第２パンチの先端外周部が、断面円弧状の面取りがなされており、この第２パンチによって形成される第１の凹部の底部周縁を、断面円弧状に形成することを特徴とする。
本発明の請求項３に記載の厚肉板金における座ぐりの形成方法は、請求項２に記載の前記第２の凹部上端縁と、前記肉厚板金の表面とが、前記第１の凹部周縁に形成される円弧面によって接続されていることを特徴とする。
本発明の請求項４に記載のプレス装置は、厚肉板金に貫通孔を形成し、前記厚肉板金の前記貫通孔の端部側の表面に座ぐりを形成するためのプレス装置であって、前記厚肉板金が載置されるダイと、前記貫通孔の内径と同一外径を有する第１パンチと、形成すべき座ぐりの内径よりも大きな外径を有する第２パンチと、形成すべき座ぐりの内径とほぼ同等の外径を有する第３パンチと、これらの第１ないし第３のパンチを選択的に前記ダイ上の厚肉板金に対向させるとともに、これらを前記ダイへ向けて押下するプレス機構とを備え、このプレス機構が、前記第１パンチを押下させて、前記厚肉板金を打ち抜き、ついで、第２パンチを押下させて前記貫通孔まわりに所定深さの第１の凹部を形成し、次いで、前記第３パンチを押下させて、前記第１の凹部に、所定深さの第２の凹部を同心状に形成するようになされていることを特徴とする。
本発明の請求項５に記載のプレス装置は、請求項４に記載の前記第２パンチの先端外周部が、円弧状に面取りされていることを特徴とする。
本発明の請求項６に記載のプレス装置は、請求項５に記載の前記第２パンチの面取りの内側の端縁を結んで得られる円の直径が、形成すべき座ぐりの内径とほぼ同等となされていることを特徴とする。
【０００８】
【発明の実施の形態】
以下、本発明の一実施形態について図面を参照して説明する。
まず、本実施形態のプレス装置の一実施形態について説明すれば、厚肉板金１が載置されるダイ２と、このダイ２に対向配置される第１パンチ３（図１参照）と、形成すべき座ぐりの内径よりも大きな外径を有する第２パンチ４（図２参照）と、形成すべき座ぐりの内径とほぼ同等の外径を有する第３パンチ５（図３参照）と、これらの第１ないし第３パンチ３・４・５を択一的に前記ダイ２へ対向させるとともに、このダイ２上の厚肉板金１へ向けて押下させるプレス機（図示略）とを備えている。
【０００９】
ついで、このように構成された本実施形態に係わるプレス装置の作用とともに、本実施形態に係わる座ぐりの形成方法について説明する。
まず、ダイ２上に厚肉板金１を載置し、この厚肉板金１の所定位置に、第１パンチ３を、図１に示すように位置合わせした後に、この第１パンチ３をプレス機によって押下させて、前記厚肉板金１をその厚さ方向に打ち抜くことにより、貫通孔６を形成する。
【００１０】
ついで、第２パンチ４を、前記貫通孔６と同軸上に位置合わせするとともに、この第２パンチ４を、プレス機によって図２に矢印で示すように押下させて、前記厚肉板金１を所定深さまで塑性変形させて第１の凹部７を形成する。
【００１１】
さらに、図３に示すように、前記第２パンチ４に代えて第３パンチ５を、前記貫通孔６および第１の凹部７と同軸上に位置合わせした後に、この第３パンチ５をプレス機によって押下して、前記厚肉板金１の第１の凹部７底部を、所定深さに塑性変形させて第２の凹部８を形成して、座ぐりを形成する。
【００１２】
このようにして座ぐり（第２の凹部８）を形成する場合、まず、大きめの第２パンチ４によって厚肉板金１の板厚の途中まで塑性変形させ、ついで、小さめの第３パンチ５によって所定深さまで塑性変形させることによって座ぐりを形成するようにしたから、各工程において必要とされるプレス力が小さく抑えられ、この結果、プレス装置の大型化が抑制される。
【００１３】
そして、座ぐり（第２の凹部８）を形成するのに先立って、外径の大きな第２パンチ４によって予備成形を行い、この第２パンチ４よりも外径の小さな第３パンチ５によって座ぐり（第２の凹部８）を成形するものであるから、第３パンチ５による成型時において、この第３パンチ５と先に形成されている第１の凹部７の内周壁との干渉がなく、したがって、この第３パンチ５の損傷が防止されるとともに、形成される座ぐり（第２の凹部８）の寸法精度が確保される。
【００１４】
一方、本実施形態においては、前記第２パンチ４の先端外周縁部に、断面円弧状の面取り９が全周にわたって施されている。
このような第２パンチ４によって第１の凹部７を成形すると、図２および図３に示すように、前記第１の凹部７の底壁と外周壁との交差部分の内面形状が円弧状となる。
さらに、前記面取り９の内側の縁部を結んで得られる円の直径と、前記第３パンチ５の外径とを一致させておくことにより、前記第１の凹部７の上端周縁部と、第２の凹部８の上端周縁部が円弧面によってつながる。
これによって、前記厚肉板金１の、座ぐり（第２の凹部８）が形成される部位の断面形状の変化が緩やかになり、前記厚肉板金１の強度低下が抑制される。
【００１５】
なお、前記実施形態において示した各構成部材の諸形状や寸法等は一例であって、設計要求等に基づき種々変更可能である。
【００１６】
【発明の効果】
以上説明したように、本発明に係わる厚肉板金における座ぐりの形成方法によれば、厚肉板金を複数のプレス工程によって板厚方向に塑性変形させるとともに、先の工程に用いられるパンチよりも後の工程に用いられるパンチを小径にすることにより、プレスに要する動力の増加を抑制することができるとともに、後の工程において用いられるパンチの損傷を防止し、また、形成される座ぐりの寸法精度を高めることができる。
また、先の工程に用いられるパンチの先端周縁部に、円弧状の面取りを設けておくことにより、座ぐりと厚肉板金表面との連続部を円滑な円弧面とし、これによって、厚肉板金の、前記座ぐりが形成される部位の断面形状の変化を緩やかにして、厚肉板金に生じる応力の伝達を円滑にして、その強度を確保することができる。
【図面の簡単な説明】
【図１】本発明の一実施形態を示すもので、第１パンチによる貫通孔の形成工程を説明するための縦断面図である。
【図２】本発明の一実施形態を示すもので、第２パンチによる第１の凹部の形成工程を説明するための縦断面図である。
【図３】本発明の一実施形態を示すもので、第３パンチによる第２の凹部（座ぐり）の形成工程を説明するための縦断面図である。
【符号の説明】
１ 厚肉板金
２ ダイ
３ 第１パンチ
４ 第２パンチ
５ 第３パンチ
６ 貫通孔
７ 第１の凹部
８ 第２の凹部（座ぐり）
９ 面取り[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a counterbore forming method for forming a counterbore on a thick sheet metal and a press apparatus for counterbore formation.
[0002]
[Prior art]
Generally, a through hole for inserting a bolt is formed on a thick sheet metal, and a counterbore is formed around the through hole to improve the sitting of the bolt or a nut screwed to the bolt. To be done.
[0003]
As a conventional example for forming the counterbore, after the through hole is formed, the thick sheet metal is plastically deformed to a predetermined depth by using a second punch having an outer diameter larger than the through hole. And forming a spot face.
However, as described above, in the case of a thick sheet metal, when the counterbore is to be formed by one-step press molding, a great amount of pressure is required, resulting in a problem that the press device is enlarged. .
[0004]
Therefore, a method of reducing the pressing force in each process by performing the pressing process using the second punch in a plurality of times has been attempted.
[0005]
[Problems to be solved by the invention]
Incidentally, as described above, when the pressing process using the second punch is performed in a plurality of steps, the following problems to be improved arise.
That is, in the second and subsequent press processes, if the second punch and the recessed portion formed in advance are not aligned with high accuracy, the second punch collides with the opening edge of the recessed portion and It is a problem that it is assumed that the two punches are damaged.
In addition, when a position shift occurs between the previously formed recess and the second punch, the recess is enlarged by the press in the next process, and a problem that the dimensional accuracy of the spot facing is lowered is also assumed.
[0006]
The present invention has been made in view of such conventional problems, and provides a counterbore forming method and a press device for a thick sheet metal that can suppress an increase in power required for pressing and can obtain high dimensional accuracy. It is intended to do.
[0007]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a counterbore forming method for a thick-walled sheet metal in which a through-hole is formed in the thick-walled sheet metal and an end side of the through-hole of the thick-walled sheet metal is achieved. A first punch having the same outer diameter as the inner diameter of the through hole, a second punch having an outer diameter larger than the inner diameter of the counterbore to be formed, A third punch having an outer diameter substantially equal to the inner diameter of the counterbore to be formed, the through hole is formed by punching out the thick sheet metal with the first punch, and the second punch is formed with the through hole. In addition to being installed on the same axis, the second punch is used to plastically deform the thick metal plate to a predetermined depth to form a first recess, and then the third punch is installed on the same axis as the first recess. Along with this third punch, And forming a counterbore to form a second recess by plastically deforming the bottom surface of the first concave portion to a predetermined depth.
According to claim 2 of the present invention, the counterbore forming method for the thick sheet metal is such that the outer peripheral portion of the tip of the second punch according to claim 1 is chamfered with an arc-shaped cross section. The bottom periphery of the first recess to be formed is formed in a cross-sectional arc shape.
According to a third aspect of the present invention, in the method of forming a counterbore in the thick sheet metal, the upper edge of the second concave portion according to the second aspect and the surface of the thick metal plate are located on the periphery of the first concave portion. It is connected by the circular arc surface formed.
A press apparatus according to a fourth aspect of the present invention is a press apparatus for forming a through hole in a thick sheet metal and forming a counterbore on the surface of the end of the through hole of the thick sheet metal. A die on which the thick sheet metal is placed, a first punch having the same outer diameter as the inner diameter of the through hole, and a second punch having an outer diameter larger than the inner diameter of the counterbore to be formed A third punch having an outer diameter substantially equal to the inner diameter of the counterbore, and these first to third punches are selectively opposed to the thick sheet metal on the die and pressed toward the die. A press mechanism, which presses down the first punch to punch out the thick sheet metal, and then presses down the second punch to form a first recess having a predetermined depth around the through hole. Forming, and then pressing the third punch to A first recess, characterized in that it is adapted to form a second recess having a predetermined depth concentrically.
A press apparatus according to a fifth aspect of the present invention is characterized in that a tip outer peripheral portion of the second punch according to the fourth aspect is chamfered in an arc shape.
According to a sixth aspect of the present invention, the diameter of a circle obtained by connecting the inner edges of the chamfers of the second punch according to the fifth aspect is substantially equal to the inner diameter of the counterbore to be formed. It is characterized by being made.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
First, an embodiment of the press apparatus of the present embodiment will be described. A die 2 on which a thick sheet metal 1 is placed, a first punch 3 (see FIG. 1) disposed opposite to the die 2, and formation. A second punch 4 (see FIG. 2) having an outer diameter larger than the inner diameter of the counterbore to be formed, a third punch 5 (see FIG. 3) having an outer diameter substantially equal to the inner diameter of the counterbore to be formed, and these A press machine (not shown) is provided for selectively causing the first to third punches 3, 4, and 5 to face the die 2 and to be pressed toward the thick sheet metal 1 on the die 2.
[0009]
Next, the counterbore forming method according to the present embodiment will be described together with the operation of the press device according to the present embodiment configured as described above.
First, after placing the thick metal plate 1 on the die 2 and aligning the first punch 3 at a predetermined position of the thick metal plate 1 as shown in FIG. The through-hole 6 is formed by pressing down and punching out the thick sheet metal 1 in the thickness direction.
[0010]
Next, the second punch 4 is aligned coaxially with the through-hole 6, and the second punch 4 is pressed down by a press machine as indicated by an arrow in FIG. The first recess 7 is formed by plastic deformation to the depth.
[0011]
Further, as shown in FIG. 3, after the third punch 5 is positioned coaxially with the through hole 6 and the first recess 7 in place of the second punch 4, the third punch 5 is pressed by a press machine. To form a second recess 8 by plastically deforming the bottom of the first recess 7 of the thick sheet metal 1 to a predetermined depth to form a counterbore.
[0012]
When the counterbore (second concave portion 8) is formed in this way, first, the large second punch 4 is plastically deformed to the middle of the thickness of the thick sheet metal 1, and then the small third punch 5 is used. Since the counterbore is formed by plastic deformation to a predetermined depth, the pressing force required in each step is suppressed to a low level, and as a result, an increase in the size of the press device is suppressed.
[0013]
Prior to the formation of the counterbore (second recess 8), preforming is performed by the second punch 4 having a large outer diameter, and the third punch 5 having a smaller outer diameter than the second punch 4 is used to perform the seating. Since the hole (second recess 8) is formed, there is no interference between the third punch 5 and the inner peripheral wall of the first recess 7 formed previously when the third punch 5 is formed. Therefore, the third punch 5 is prevented from being damaged and the dimensional accuracy of the counterbore (second recess 8) to be formed is ensured.
[0014]
On the other hand, in the present embodiment, a chamfer 9 having a circular arc shape is applied to the outer peripheral edge of the tip of the second punch 4 over the entire circumference.
When the first recess 7 is formed by the second punch 4 as described above, as shown in FIGS. 2 and 3, the inner surface shape of the intersecting portion between the bottom wall and the outer peripheral wall of the first recess 7 is an arc shape. Become.
Furthermore, by matching the diameter of the circle obtained by connecting the inner edge of the chamfer 9 with the outer diameter of the third punch 5, the upper peripheral edge of the first recess 7, The upper peripheral edge of the two recesses 8 are connected by a circular arc surface.
As a result, the change in the cross-sectional shape of the portion of the thick sheet metal 1 where the counterbore (second concave portion 8) is formed becomes moderate, and the strength reduction of the thick sheet metal 1 is suppressed.
[0015]
Note that the shapes, dimensions, and the like of the constituent members shown in the embodiment are examples, and can be variously changed based on design requirements and the like.
[0016]
【The invention's effect】
As described above, according to the counterbore forming method for a thick sheet metal according to the present invention, the thick sheet metal is plastically deformed in the sheet thickness direction by a plurality of pressing processes, and after the punch used in the previous process. By reducing the diameter of the punch used in this process, it is possible to suppress an increase in power required for pressing, to prevent damage to the punch used in the subsequent process, and to improve the dimensional accuracy of the counterbore formed. Can be increased.
In addition, by providing an arc-shaped chamfer at the peripheral edge of the punch used in the previous process, the continuous part between the counterbore and the thick sheet metal surface becomes a smooth arc surface. The change of the cross-sectional shape of the part where the spot face is formed can be moderated, the stress generated in the thick sheet metal can be smoothly transmitted, and the strength can be ensured.
[Brief description of the drawings]
FIG. 1 shows an embodiment of the present invention and is a longitudinal sectional view for explaining a process of forming a through hole by a first punch.
FIG. 2, showing an embodiment of the present invention, is a longitudinal sectional view for explaining a process of forming a first recess by a second punch.
FIG. 3, showing an embodiment of the present invention, is a longitudinal sectional view for explaining a step of forming a second recess (counterbore) using a third punch.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Thick sheet metal 2 Die 3 1st punch 4 2nd punch 5 3rd punch 6 Through-hole 7 1st recessed part 8 2nd recessed part (counterbore)
9 Chamfer

Claims (6)

厚肉板金に貫通孔を形成し、前記厚肉板金の前記貫通孔の端部側の表面に座ぐりを形成するための方法であって、前記貫通孔の内径と同一外径を有する第１パンチと、形成すべき座ぐりの内径よりも大きな外径を有する第２パンチと、形成すべき座ぐりの内径とほぼ同等の外径を有する第３パンチとを用い、前記厚肉板金を前記第１パンチによって打ち抜くことにより前記貫通孔を形成し、前記第２パンチを、前記貫通孔と同軸上に設置するとともに、この第２パンチにより前記厚肉板金を所定深さまで塑性変形させて第１の凹部を形成し、ついで、前記第３パンチを前記第１の凹部と同軸上に設置するとともに、この第３パンチにより、前記第１の凹部の底面を所定深さまで塑性変形させることにより第２の凹部を形成して座ぐりを形成することを特徴とする厚肉板金における座ぐりの形成方法。A method for forming a through hole in a thick sheet metal and forming a counterbore on a surface of the thick sheet metal on an end side of the through hole, the first having the same outer diameter as the inner diameter of the through hole Using the punch, the second punch having an outer diameter larger than the inner diameter of the counterbore to be formed, and the third punch having an outer diameter substantially equal to the inner diameter of the counterbore to be formed, the thick sheet metal is used as the first sheet metal. The through hole is formed by punching with a punch, the second punch is placed coaxially with the through hole, and the thick metal plate is plastically deformed to a predetermined depth by the second punch to form a first recess. Then, the third punch is placed on the same axis as the first recess, and the third recess is used to plastically deform the bottom surface of the first recess to a predetermined depth. Form a counterbore Counterbore method of forming the thick sheet metal, characterized in that. 前記第２パンチの先端外周部が、断面円弧状の面取りがなされており、この第２パンチによって形成される第１の凹部の底部周縁を、断面円弧状に形成することを特徴とする請求項１に記載の厚肉板金における座ぐりの形成方法。The tip outer peripheral portion of the second punch is chamfered in an arc shape in cross section, and the bottom peripheral edge of the first recess formed by the second punch is formed in an arc shape in cross section. A method of forming a spot face in the thick sheet metal according to 1. 前記第２の凹部上端縁と、前記肉厚板金の表面とが、前記第１の凹部周縁に形成される円弧面によって接続されていることを特徴とする請求項２に記載の厚肉板金における座ぐりの形成方法。3. The thick sheet metal according to claim 2, wherein the upper edge of the second recess and the surface of the thick sheet metal are connected by an arc surface formed at the periphery of the first recess. Counterbore formation method. 厚肉板金に貫通孔を形成し、前記厚肉板金の前記貫通孔の端部側の表面に座ぐりを形成するためのプレス装置であって、前記厚肉板金が載置されるダイと、前記貫通孔の内径と同一外径を有する第１パンチと、形成すべき座ぐりの内径よりも大きな外径を有する第２パンチと、形成すべき座ぐりの内径とほぼ同等の外径を有する第３パンチと、これらの第１ないし第３のパンチを選択的に前記ダイ上の厚肉板金に対向させるとともに、これらを前記ダイへ向けて押下するプレス機構とを備え、このプレス機構が、前記第１パンチを押下させて、前記厚肉板金を打ち抜き、ついで、第２パンチを押下させて前記貫通孔まわりに所定深さの第１の凹部を形成し、次いで、前記第３パンチを押下させて、前記第１の凹部に、所定深さの第２の凹部を同心状に形成するようになされていることを特徴とするプレス装置。A press apparatus for forming a through hole in a thick sheet metal and forming a counterbore on a surface of the thick sheet metal on an end side of the through hole, the die on which the thick sheet metal is placed, A first punch having the same outer diameter as the inner diameter of the through hole, a second punch having an outer diameter larger than the inner diameter of the counterbore to be formed, and a third punch having an outer diameter substantially equal to the inner diameter of the counterbore to be formed A punch and a pressing mechanism that selectively opposes the first to third punches to the thick metal plate on the die and presses them toward the die, and the pressing mechanism includes the first punch Depressing one punch to punch out the thick sheet metal, then depressing the second punch to form a first recess having a predetermined depth around the through hole, and then depressing the third punch The second recess having a predetermined depth is formed in the first recess. Press apparatus characterized by being adapted to form a heart shape. 前記第２パンチの先端外周部が、円弧状に面取りされていることを特徴とする請求項４に記載のプレス装置。The press apparatus according to claim 4, wherein the outer peripheral portion of the tip end of the second punch is chamfered in an arc shape. 前記第２パンチの面取りの内側の端縁を結んで得られる円の直径が、形成すべき座ぐりの内径とほぼ同等となされていることを特徴とする請求項５に記載のプレス装置。6. The press apparatus according to claim 5, wherein a diameter of a circle obtained by connecting inner edges of the chamfers of the second punch is substantially equal to an inner diameter of a counterbore to be formed.
JP2000134872A 2000-05-08 2000-05-08 Counterbore forming method and press apparatus for thick sheet metal Expired - Fee Related JP3636964B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2000134872A JP3636964B2 (en) 2000-05-08 2000-05-08 Counterbore forming method and press apparatus for thick sheet metal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2000134872A JP3636964B2 (en) 2000-05-08 2000-05-08 Counterbore forming method and press apparatus for thick sheet metal

Publications (2)

Publication Number Publication Date
JP2001314925A JP2001314925A (en) 2001-11-13
JP3636964B2 true JP3636964B2 (en) 2005-04-06

Family

ID=18643066

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2000134872A Expired - Fee Related JP3636964B2 (en) 2000-05-08 2000-05-08 Counterbore forming method and press apparatus for thick sheet metal

Country Status (1)

Country Link
JP (1) JP3636964B2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5322397B2 (en) * 2007-03-28 2013-10-23 中央精機株式会社 Method for manufacturing vehicle wheel and vehicle wheel
CN108543856A (en) * 2018-04-03 2018-09-18 广州华立科技股份有限公司 A kind of numerical control drilling method of counterbore

Also Published As

Publication number Publication date
JP2001314925A (en) 2001-11-13

Similar Documents

Publication Publication Date Title
US7677430B2 (en) Cold-pressure welding method and metal product welded by the method
JP2004167547A (en) Method for shearing sheet
JP2008296252A (en) Press molded product, and manufacturing method and fabrication equipment of press molded product
CA2308916C (en) Punch-stamp rivet
JP2583201B2 (en) Joint structure between metal plates
US8056384B2 (en) Punching method
JP3636964B2 (en) Counterbore forming method and press apparatus for thick sheet metal
US5732587A (en) Metallic workpiece having to-be-ironed section and method for forming the same
JPH10156443A (en) Safety valve of metal container
JP3615712B2 (en) Clutch piston and method for manufacturing the clutch piston
JP2006346703A (en) Press working method
JP3190264B2 (en) Manufacturing method of T nut
JP2004322104A (en) Drawing die and drawing method
JP6630300B2 (en) Processing method of cylindrical body and cylindrical body
US6006577A (en) Stackable drawn pieces and process and apparatus for manufacture thereof
US5762196A (en) Stackable drawn pieces
JP3715658B2 (en) Method for forming recess of cylindrical body
JPH0788582A (en) Method for forming ring gear of metal plate
JPH0866730A (en) Deep draw forming method for metallic sheet
JPH07256377A (en) Forming method for tooth profile parts made of sheet metal
EP1599777B1 (en) Pedal unit plate and method for the production thereof
CN215879527U (en) High-density stamping die convenient to shaping
JP3187103B2 (en) Fastening method and fastening structure
JPH1080735A (en) Joining method, joyning device and joining structure
JP3161167B2 (en) Metal plate processing method and coining device

Legal Events

Date Code Title Description
A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20040722

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20041214

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20050106

R150 Certificate of patent or registration of utility model

Free format text: JAPANESE INTERMEDIATE CODE: R150

Ref document number: 3636964

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20080114

Year of fee payment: 3

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20090114

Year of fee payment: 4

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20100114

Year of fee payment: 5

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110114

Year of fee payment: 6

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110114

Year of fee payment: 6

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120114

Year of fee payment: 7

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130114

Year of fee payment: 8

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130114

Year of fee payment: 8

S111 Request for change of ownership or part of ownership

Free format text: JAPANESE INTERMEDIATE CODE: R313111

R350 Written notification of registration of transfer

Free format text: JAPANESE INTERMEDIATE CODE: R350

LAPS Cancellation because of no payment of annual fees