JP2000079438A - Plate thickness increasing method of boss and its device - Google Patents

Plate thickness increasing method of boss and its device

Info

Publication number
JP2000079438A
JP2000079438A JP10249272A JP24927298A JP2000079438A JP 2000079438 A JP2000079438 A JP 2000079438A JP 10249272 A JP10249272 A JP 10249272A JP 24927298 A JP24927298 A JP 24927298A JP 2000079438 A JP2000079438 A JP 2000079438A
Authority
JP
Japan
Prior art keywords
boss
ceiling
flange
work
vertical
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
JP10249272A
Other languages
Japanese (ja)
Inventor
Seiji Otsuka
大塚清司
Toshiharu Suganuma
菅沼俊治
Original Assignee
Aida Eng Ltd
アイダエンジニアリング株式会社
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 Aida Eng Ltd, アイダエンジニアリング株式会社 filed Critical Aida Eng Ltd
Priority to JP10249272A priority Critical patent/JP2000079438A/en
Publication of JP2000079438A publication Critical patent/JP2000079438A/en
Pending legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To provide parts wherein a defect is not generated in boss in a method and a device for obtaining the parts where the boss attaches to a flange by cold forging. SOLUTION: The wall thickness of a ceiling is transferred to the upper part of a vertical wall of a boss by pressurizing the ceiling of the boss (A). Next, a hole is formed in the ceiling of the boss (B). Successively, compression drawing (necking) and butting are applied to the perforated part (C). Finally, a product is obtained by pressurizing the upper end part of the boss (D). The compression drawing (necking) means a process wherein the diameter of the boss is reduced by pressurizing the outer peripheral part of the vertical wall of the boss with the inner peripheral part of a ring shaped die. That is, the boss is necked with the ring shaped die. At this time, the inside diameter part is free. For example, a punch which restricts the inside diameter part of the boss does not exist.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【0001】[0001]
【発明の属する技術分野】本願発明は、フランジにボス
がついている部品を、冷間鍛造で成形して得る方法及び
装置に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a device for obtaining a part having a boss on a flange by cold forging.
【0002】[0002]
【従来の技術】従来、このような冷間鍛造は、図6の
A、B、C、Dの行程で行われていた。即ち、同図Aのよう
にボスを絞り加工で成形させると、ボス上部のコーナ部
の板厚が減少する。次に、ボスの天井を穴明けする。続
いて、ボスをバーリングし、最後にボスの先端面を押圧
すると、ボスの内側に欠陥のある製品になる。この欠陥
は、材料不足による所謂ひけの現象、あるいは材料がひ
けの部分に覆い被さり、材料の重なる現象によるもので
ある。いずれにしても、この欠陥は、前記Aの行程で発
生した板厚の減少に起因する。
2. Description of the Related Art Conventionally, such a cold forging is performed by using a method shown in FIG.
A, B, C, and D were being performed. That is, when the boss is formed by drawing as shown in FIG. A, the thickness of the corner at the top of the boss decreases. Next, the boss ceiling is drilled. Subsequently, the boss is burred, and finally, the tip surface of the boss is pressed, resulting in a product having a defect inside the boss. This defect is due to the phenomenon of so-called sinking due to a shortage of material, or the phenomenon that the material is covered by the sinkage and the material overlaps. In any case, this defect is caused by a reduction in the thickness of the sheet generated in the process A.
【0003】[0003]
【発明が解決しようとする課題】本願発明は、フランジ
にボスがついている部品を、冷間鍛造加工で得る方法及
び装置において、ボスに欠陥が発生しないものを提供す
ることである。
SUMMARY OF THE INVENTION An object of the present invention is to provide a method and an apparatus for obtaining a component having a boss on a flange by cold forging, which do not cause any defect in the boss.
【0004】[0004]
【課題を解決するための手段】本願発明においては、予
め成形されたワークのボスの天井を圧縮して、材料をボ
スの縦壁上部の板厚を増加させ、その後の工程で圧縮絞
り(ネッキング)及びバーリングする。
According to the present invention, the ceiling of a boss of a preformed workpiece is compressed to increase the thickness of the material at the upper portion of the vertical wall of the boss. ) And burring.
【0005】[0005]
【発明の実施の形態】図1において、左半分は素材1を
示し、右半分は前記素材を冷間鍛造で成形した状態を示
している。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, the left half shows a blank 1 and the right half shows a state in which the blank is formed by cold forging.
【0006】図1のAにおいて、ボスの天井を押圧して天
井の肉をボスの縦壁上部に移動させる。次に、Bに示す
ように、ボスの天井に穴明けする。続いて、Cに示すよ
うに、穴明けした部分を圧縮絞り(ネッキング)及びバ
ーリングする。最後に、ボスの上端部を押圧してDに示
す形状の製品を得る。
In FIG. 1A, the ceiling of the boss is pressed to move the meat of the ceiling to the upper part of the vertical wall of the boss. Next, as shown in B, a hole is drilled in the ceiling of the boss. Subsequently, as shown in C, the punched portion is subjected to compression drawing (necking) and burring. Finally, the product having the shape shown in D is obtained by pressing the upper end of the boss.
【0007】この圧縮絞り(ネッキング)は、ボスの縦
壁の外周部をリング状のダイ内周部で押圧し、ボスの径
をを小さくする行程を意味する。即ち、ボスはリング状
のダイでネッキングされる。この際、ボスの内径部はフ
リーで、例えばボス内径部を拘束するパンチは存在しな
い。
The compression drawing (necking) means a process of pressing the outer peripheral portion of the vertical wall of the boss with the inner peripheral portion of the ring-shaped die to reduce the diameter of the boss. That is, the boss is necked by a ring-shaped die. At this time, the inner diameter of the boss is free, and for example, there is no punch that restrains the inner diameter of the boss.
【0008】図1のDに示すようなボスに欠陥のない製
品を得るには、同図のAに示す工程が必要である。
In order to obtain a product having no defect in the boss as shown in FIG. 1D, the process shown in FIG. 1A is required.
【0009】図1のAの工程は、図2に示す装置、即ち
金型を用いて行われる。図2の左半分はワークを示し、
右半分はこのワークを成形した状態を示している。
The process shown in FIG. 1A is performed using the apparatus shown in FIG. 2, that is, a mold. The left half of FIG. 2 shows the work,
The right half shows a state where this work is formed.
【0010】プレス機械のスライドに上型が固定され、
プレス機械のボルスタに下型が固定される。上型には、
パンチ2が固定され、上ダイ4がピン6で昇降自在に設
けられている。ピン6は、油圧を利用して駆動される。
The upper die is fixed to the slide of the press machine,
The lower mold is fixed to the bolster of the press machine. In the upper mold,
The punch 2 is fixed, and the upper die 4 is provided so as to be able to move up and down with pins 6. The pin 6 is driven using hydraulic pressure.
【0011】図2は図1に似ている。即ち、図2の金型
構造は図1の金型構造と酷似している。互いに相違する
点は、上ダイ15に突起がないこと、下ダイ13に素材
の外周部を拘束する凹部が存在することの2点である。
この凹部の作用で、材料がフランジ部に流れるのを阻止
出来る。
FIG. 2 is similar to FIG. That is, the mold structure of FIG. 2 is very similar to the mold structure of FIG. The two points are different from each other in that the upper die 15 has no protrusion and the lower die 13 has a concave portion for restraining the outer peripheral portion of the material.
By the action of the concave portion, the material can be prevented from flowing to the flange portion.
【0012】下型には、カウンタパンチ3が固定され、
その外周部に下ダイ5が設けられている。下ダイ5の外
周部にリングダイ7が設けられている。リングダイ7
は、ワーク1の外周部を拘束する役目をもっている。前
記下ダイ5は、製品をノックアウトする為に、昇降自在
になっている。
A counter punch 3 is fixed to the lower die,
A lower die 5 is provided on the outer periphery. A ring die 7 is provided on an outer peripheral portion of the lower die 5. Ring die 7
Has a role of restraining the outer peripheral portion of the work 1. The lower die 5 is movable up and down in order to knock out a product.
【0013】予め成形されたワーク1を、カウンタパン
チ3にかぶせて、即ちカウンタパンチ3をワークのボス
の凹部に挿入させ、ワーク1の外周部をリングダイ7で
拘束すると共に、下ダイ5と上ダイ4とでワーク1のフ
ランジ部を押さえた状態でカウンタパンチ3とパンチ2
とでボスの天井部を圧縮し、材料を移動させる。
The work 1 formed in advance is placed on the counter punch 3, that is, the counter punch 3 is inserted into the recess of the boss of the work, and the outer periphery of the work 1 is restrained by the ring die 7 and the lower die 5 is While pressing the flange portion of the work 1 with the upper die 4, the counter punch 3 and the punch 2
And compress the ceiling of the boss and move the material.
【0014】このようにして、図1のAの加工が行われ
る。尚、図3は、ボスの天井に予め穴を設けてある場合
の金型を示している。金型の構造は図2と同じである。
図3の実施例の場合は、この後の工程で穴明けを行う必
要はなく、いきなり圧縮絞り(ネッキング)及びバーリ
ングを行うことになる。
Thus, the processing shown in FIG. 1A is performed. FIG. 3 shows a mold in which holes are provided in advance on the ceiling of the boss. The structure of the mold is the same as in FIG.
In the case of the embodiment shown in FIG. 3, it is not necessary to perform drilling in the subsequent steps, and compression compression (necking) and burring are performed immediately.
【0015】[0015]
【発明の効果】本願発明によれば、ボスの天井を圧縮し
て材料を移動させる工程を設けているので、製品のボス
に欠陥が発生することがない。
According to the present invention, since the step of compressing the ceiling of the boss and moving the material is provided, no defect occurs in the boss of the product.
【図面の簡単な説明】[Brief description of the drawings]
【図1】工程説明図FIG. 1 is a process explanatory view.
【図2】金型の縦断面図FIG. 2 is a longitudinal sectional view of a mold.
【図3】金型の縦断面図FIG. 3 is a longitudinal sectional view of a mold.
【図4】従来の工程説明図FIG. 4 is an explanatory view of a conventional process.
【符号の説明】[Explanation of symbols]
1はワーク、2はパンチ、3はカウンタパンチ、4は上
ダイ、5は下台、6はピン、7はリングダイである.
1 is a work, 2 is a punch, 3 is a counter punch, 4 is an upper die, 5 is a lower stand, 6 is a pin, and 7 is a ring die.

Claims (6)

    【特許請求の範囲】[Claims]
  1. 【請求項1】フランジにボスがついている部品を、冷間
    鍛造で成形して得る方法において、予め成形されたワー
    クのボスの天井を圧縮し、天井の材料をボスの縦壁上部
    に移動させ、天井を穴明けし、圧縮絞り(ネッキング)
    及びバーリングすることを特徴とするボスの板厚増加方
    法。
    In a method for obtaining a part having a boss attached to a flange by cold forging, a ceiling of a boss of a preformed work is compressed, and a material of the ceiling is moved to an upper portion of a vertical wall of the boss. Drilling the ceiling, compression drawing (necking)
    And increasing the thickness of the boss by burring.
  2. 【請求項2】フランジにボスがついている部品を、冷間
    鍛造で成形して得る方法において、予め成形され、ボス
    の天井に穴明けされたワークのボスの天井を圧縮し、天
    井の材料をボスの縦壁上部に移動させ、圧縮絞り(ネッ
    キング)及びバーリングすることを特徴とするボスの板
    厚増加方法。
    2. A method for obtaining a part having a boss attached to a flange by cold forging, wherein a ceiling of a boss of a work, which is formed in advance and is drilled in the ceiling of the boss, is compressed, and the material of the ceiling is reduced. A method for increasing the thickness of a boss, wherein the boss is moved to an upper portion of a vertical wall of the boss to perform compression drawing (necking) and burring.
  3. 【請求項3】前記ボスの外周部を拘束し、前記ワークの
    フランジを押圧し、前記ワークの外周部を拘束した状態
    で、天井の材料をボスの縦壁上部に移動させることを特
    徴とする請求項1又は請求項2記載のボスの板厚増加方
    法。
    3. The material of the ceiling is moved to the upper portion of the vertical wall of the boss while the outer peripheral portion of the boss is restrained, the flange of the work is pressed, and the outer peripheral portion of the work is restrained. 3. The method for increasing the thickness of a boss according to claim 1 or 2.
  4. 【請求項4】フランジにボスがついている部品を、冷間
    鍛造で成形して得る装置において、予め成形されたワー
    クのボスの凹部に挿入され、対向するパンチと共同して
    ボスの天井を圧縮して当該天井の材料を前記ボスの縦壁
    上部に移動させるためのカウンタパンチを有することを
    特徴とするボスの板厚増加装置。
    4. An apparatus obtained by forming a part having a boss on a flange by cold forging, wherein the part is inserted into a recess of the boss of a preformed work, and a ceiling of the boss is compressed in cooperation with an opposing punch. A boss plate thickness increasing device, further comprising a counter punch for moving the material of the ceiling to an upper portion of the vertical wall of the boss.
  5. 【請求項5】フランジにボスがついている部品を、冷間
    鍛造で成形して得る装置において、予め成形されたワー
    クの、天井に穴明けされたボスの凹部に挿入され、対向
    するパンチと共同してボスの天井を圧縮して当該天井の
    材料を前記ボスの縦壁上部に移動させるためのカウンタ
    パンチを設けたことを特徴とするボスの板厚増加装置。
    5. A device obtained by forming a part having a boss on a flange by cold forging, wherein the part is inserted into a recess of a boss formed in a ceiling of a preformed work and cooperates with an opposing punch. A boss plate thickness increasing device, further comprising a counter punch for compressing a ceiling of the boss and moving a material of the ceiling to an upper portion of a vertical wall of the boss.
  6. 【請求項6】前記ボスの縦壁外周部を拘束し、前記ワー
    クのフランジを押圧する部材と前記フランジ外周部を拘
    束する部材を設けたことを特徴とする請求項4又は請求
    項5記載のボスの板厚増加装置。
    6. The boss according to claim 4, wherein a member for restraining an outer peripheral portion of the vertical wall of the boss and pressing a flange of the work and a member for restraining the outer peripheral portion of the flange are provided. Boss thickness increasing device.
JP10249272A 1998-09-03 1998-09-03 Plate thickness increasing method of boss and its device Pending JP2000079438A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10249272A JP2000079438A (en) 1998-09-03 1998-09-03 Plate thickness increasing method of boss and its device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10249272A JP2000079438A (en) 1998-09-03 1998-09-03 Plate thickness increasing method of boss and its device

Publications (1)

Publication Number Publication Date
JP2000079438A true JP2000079438A (en) 2000-03-21

Family

ID=17190508

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10249272A Pending JP2000079438A (en) 1998-09-03 1998-09-03 Plate thickness increasing method of boss and its device

Country Status (1)

Country Link
JP (1) JP2000079438A (en)

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