JPH04172134A - Method for boring bolt hole in wheel disk - Google Patents

Method for boring bolt hole in wheel disk

Info

Publication number
JPH04172134A
JPH04172134A JP30138790A JP30138790A JPH04172134A JP H04172134 A JPH04172134 A JP H04172134A JP 30138790 A JP30138790 A JP 30138790A JP 30138790 A JP30138790 A JP 30138790A JP H04172134 A JPH04172134 A JP H04172134A
Authority
JP
Japan
Prior art keywords
bolt hole
hole
coining
punching
pilot hole
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.)
Granted
Application number
JP30138790A
Other languages
Japanese (ja)
Other versions
JPH07108424B2 (en
Inventor
Nobutsugu Kawada
川田 喜承
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to JP30138790A priority Critical patent/JPH07108424B2/en
Publication of JPH04172134A publication Critical patent/JPH04172134A/en
Publication of JPH07108424B2 publication Critical patent/JPH07108424B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Punching Or Piercing (AREA)

Abstract

PURPOSE:To bore the bolt hole according to the design specifications in the disk of high-tension steel plate without causing working error by punching the prepared hole at the 1st process and working with depression-deforming the part around the prepared hole. CONSTITUTION:When the depressed part 9 around the prepared hole 8 depression-deformed with the punching work of the 1st process is mounted on the lower die at the 2nd process, it is entered inside from the upper end of the recess part 15 of the coining die 11, becoming a hanger for preventing the prepared hole 8 from enlarging in the lateral direction, and besides, facilitating the downward deformation by burring work because it is already a little downward. Accordingly, the bolt hole 16 of a prescribed design specification can be surely worked without causing a working gap.

Description

【発明の詳細な説明】 (産業上の利用分野〕 本発明は、板材より成形されるホイールディスクに、車
軸への取付は用ボルト穴を加工する方法に関するもので
ある。
DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of forming bolt holes for attachment to an axle in a wheel disk formed from a plate material.

〔従来の技術〕[Conventional technology]

従来、この種の車輪のボルト穴加工方法は、まず第3図
(へ)およびゃ)に示すように、絞り成形で形成された
ディスク(18)の膨出部(19)に、第1工程で打抜
きポンチ(20)と打抜きダイス(21)とで以て下穴
(22)を打抜き加工し、次いで第4図(イ)およびI
r:1)に示すように、第2工程で、テーパ面および円
筒面からなるバーリング部(23)と、テーパ面あるい
は球面のコイニング部(24)とを形成したコイニング
ポンチ(25)および凹部(26)を形成したコイニン
グダイス(27)とで以て、下穴(22)を所定の直径
にバーリング加工してボルト穴(28)に仕上げると共
に、ボルト穴(28)の周囲をコイニング加工してナツ
ト座(29)を成形するというものであった。
Conventionally, in the method of machining bolt holes for this type of wheel, as shown in FIGS. A pilot hole (22) is punched out using a punch (20) and a punching die (21), and then as shown in FIGS.
As shown in r:1), in the second step, a coining punch (25) and a recess ( The pilot hole (22) is burred to a predetermined diameter using the coining die (27) that has been formed to form a bolt hole (26) to form a bolt hole (28), and the periphery of the bolt hole (28) is then coined. The idea was to mold the nut seat (29).

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

近年では、車輪を軽量化するためにディスクの板厚を極
力薄くする必要があり、ディスクの材料には高抗張力鋼
板が多く使用されるようになっている。
In recent years, in order to reduce the weight of wheels, it is necessary to make the thickness of the disc as thin as possible, and high tensile strength steel plates are increasingly being used as the material for the disc.

そのため、これら高抗張力鋼板製のディスクを加工する
工具の方も、通常の焼き入れを行なっただけでは焼き付
きやカジリが発生しやすく耐久性が悪いので、より高度
な表面処理(TD処理、CVD処理等)が施されるよう
になっている。
For this reason, the tools used to process these high-tensile steel discs are subject to more advanced surface treatments (TD treatment, CVD treatment, etc.) are now being applied.

ところが、この種の表面処理を施した工具は、表面の滑
りがよくなるため、上記従来技術の第2工程におけるボ
ルト穴のバーリング加工の際に、下穴(22)の周縁部
とコイニングポンチ(25)のバーリング部(23)と
の摩擦が小さくなり、下穴(22)の周辺部分が曲がる
よりも下穴(22)が拡がろうとする傾向が強くなる。
However, tools with this type of surface treatment have a smoother surface, so when burring bolt holes in the second step of the prior art, the peripheral edge of the prepared hole (22) and the coining punch (25) ) with the burring part (23) becomes smaller, and the tendency of the pilot hole (22) to expand is stronger than that of the peripheral portion of the pilot hole (22) being bent.

その結果、従来技術のボルト穴加工方法では仕上がった
ボルト穴(28)の直径が設計寸法よりも大きくなって
しまうという問題があった。
As a result, the conventional bolt hole machining method has a problem in that the diameter of the finished bolt hole (28) becomes larger than the design dimension.

そこで、下穴(22)の直径を小さくしてバーリング加
工しやすくする方法も考えられるが、コイニングポンチ
(25)の先端が下穴(22)をパイロットする際にず
れを生じやすく、加工精度が悪(なるという問題や、ま
たバーリング加工された部分が長くなるため、外観上も
好ましくないという問題があった。
Therefore, a method can be considered to make the diameter of the pilot hole (22) smaller to make burring easier, but the tip of the coining punch (25) tends to shift when piloting the pilot hole (22), resulting in poor processing accuracy. There was a problem that the burred part became long, and the appearance was undesirable.

本発明は、上記従来技術の問題点に鑑みてなしたもので
、その目的とするところは高抗張力鋼板製のディスクに
、加工ミスを起こすことなく、設計寸法どおりのボルト
穴を加工する方法を提供するにある。
The present invention has been made in view of the problems of the prior art described above, and its purpose is to provide a method for machining bolt holes according to design dimensions in a disc made of high tensile strength steel plate without causing machining errors. It is on offer.

〔課題を解決するための手段〕[Means to solve the problem]

上記目的を達成するために、本発明のボルト穴加工方法
は、絞り成形によって形成されたディスクの膨出部に、
ボルト穴直径より小さな直径の下穴を打抜き加工する第
1工程と、上記下穴を所定の直径にバーリング加工して
ボルト穴に仕上げると共に、ボルト穴周囲にコイニング
加工を施してテーパ面あるいは球面のナツト座を形成す
る第2工程とからなるボルト穴の加工方法において、上
記第1工程で下穴の打抜き加工と同時に下穴周辺部分の
陥没変形加工を行なってなる。
In order to achieve the above object, the bolt hole machining method of the present invention includes
The first step is punching a pilot hole with a diameter smaller than the bolt hole diameter, burring the pilot hole to a predetermined diameter to finish the bolt hole, and coining around the bolt hole to create a tapered or spherical surface. In the bolt hole machining method, which includes a second step of forming a nut seat, in the first step, the pilot hole is punched out and at the same time, the peripheral portion of the pilot hole is depressed and deformed.

〔作 用〕[For production]

第1工程で打抜き加工と同時に陥没変形させられた下穴
周辺部分は、第2工程において、下型の上に載置すると
、コイニングダイスの凹部の上端より中へ入り込み、こ
の部分が下穴の横への拡がりを防止する引っかかりとな
ると同時に、すでにやや下向きであることがバーリング
加工による下向きの変形が容易になる。
When the part around the pilot hole, which was depressed and deformed at the same time as the punching process in the first step, is placed on the lower mold in the second step, it enters the inside of the recess of the coining die from the upper end of the recess, and this part enters into the pilot hole. It acts as a catch to prevent it from spreading laterally, and at the same time, the fact that it is already slightly downward makes it easier to deform downward by burring.

〔実施例〕〔Example〕

以下、本発明の一実施例を図面に基づいて説明する。 Hereinafter, one embodiment of the present invention will be described based on the drawings.

第1図(イ)および(ロ)は、本発明の第1工程を示す
FIGS. 1(A) and 1(B) show the first step of the present invention.

第1工程を行なうまでに、ディスク(1)は数回の絞り
成形を終えて、ボルト穴が加工される位置には円形の膨
出部(2)が形成されている。
By the time the first step is carried out, the disk (1) has been drawn several times and a circular bulge (2) is formed at the position where the bolt hole is to be machined.

プレスに取付けられる下型(3)は、打抜きダイス(4
)を上型(図示せず)は打抜きポンチ(5)を有してお
り、上記打抜きダイス(4)は、その刃部(6)をダイ
ス頂部(7)より約りn■低くしである。
The lower mold (3) attached to the press is a punching die (4).
) The upper mold (not shown) has a punch (5), and the punching die (4) has its blade (6) lower than the die top (7). .

第1工程で下型(3)にディスク(1)を載置して上型
を下降させると、打抜きポンチ(5)が膨出部(2)を
押圧し、刃部(6)に接するまで膨出部(2)を陥没変
形させた後に下穴(8)を打抜く。
In the first step, when the disk (1) is placed on the lower die (3) and the upper die is lowered, the punch (5) presses the bulge (2) until it touches the blade (6). After the bulge (2) is depressed and deformed, a pilot hole (8) is punched out.

よって、第1工程により、ディスク(1)の膨出部(2
)には、略摺鉢状の陥没部(9)と下穴(8)が形成さ
れる。
Therefore, in the first step, the bulge (2) of the disk (1) is
) is formed with a substantially mortar-shaped depression (9) and a pilot hole (8).

次に、第2図イおよび(ロ)に第2工程を示す。Next, the second step is shown in FIGS. 2A and 2B.

プレスに取付けられる下W (10)はコイニングダイ
ス(11)を、上型(図示せず)は、コイニングポンチ
(12)を有している。
The lower W (10) attached to the press has a coining die (11), and the upper mold (not shown) has a coining punch (12).

上記コイニングポンチ(12)は、下穴(8)をパイロ
ットしながらバーリング加工を行なうための、テーパ面
および円筒面からなるバーリング部(13)と、ナツト
座をコイニング加工するためのテーパ状のコイニング部
(14)とからなり、−方、コイニングダイス(11)
は中央に凹部(15)を有している。
The coining punch (12) has a burring part (13) consisting of a tapered surface and a cylindrical surface for performing burring while piloting the prepared hole (8), and a tapered coining part for coining the nut seat. Consists of part (14), - side, coining die (11)
has a recess (15) in the center.

第1工程を終えたディスク(1)を、第2工程で、コイ
ニングダイス(11)上に膨出部(2)が位置するよう
下型(10)に載置して上型を下降させると、コイニン
グポンチ(12)の先端部が下穴(8)に入り、バーリ
ング部(13)のテーパ面でパイロットされてディスク
(1)が正確に位置決めされる。
In the second step, the disk (1) that has completed the first step is placed on the lower mold (10) so that the bulge (2) is located on the coining die (11), and the upper mold is lowered. The tip of the coining punch (12) enters the pilot hole (8) and is piloted by the tapered surface of the burring part (13) to accurately position the disc (1).

更に、上型が下降して、ます下穴(8)がバーリング加
工されるが、このときディスク(1)の陥没部(9)が
コイニングダイス(11)の凹部(15)に入り込んで
下穴(8)周辺の直径方向への変形が拘束されて、下穴
(8)は水平方向に拡がることができず、下方へ変形し
て所定の直径のボルト穴(16)に仕上げられる。また
、ここで陥没部(9)がすでに下向きであるので、下方
への変形であるバーリング加工を容易にする予備成形的
な効果をも奏する。
Furthermore, the upper die is lowered and the pilot hole (8) is burred, but at this time, the recessed part (9) of the disk (1) enters the recess (15) of the coining die (11) and the pilot hole is burred. (8) Deformation in the diametrical direction of the periphery is restrained, and the prepared hole (8) cannot expand horizontally, but is deformed downward and finished into a bolt hole (16) of a predetermined diameter. Furthermore, since the recessed portion (9) is already facing downward, there is also a preforming effect that facilitates burring, which is downward deformation.

引き続いて、上型の下降が進み、コイニング部(14)
がボルト穴(16)の周囲をコイニング加ニー してナ
ツト座(17)を形成した後、上型が上昇してディスク
(1)が取り出され、加工が完了する。
Subsequently, the upper die continues to descend, and the coining part (14)
After coining and kneading around the bolt hole (16) to form a nut seat (17), the upper die is raised and the disk (1) is taken out, completing the machining.

〔発明の効果〕〔Effect of the invention〕

本発明のボルト穴加工方法は、上記構成であるため、高
抗張力鋼板を用いたディスクに加工ずれを起こすことな
(、所定の設計寸法のボルト穴を正確に加工することが
できるという優れた効果を奏するものである。
Since the bolt hole machining method of the present invention has the above-mentioned configuration, it has the excellent effect of being able to accurately machine bolt holes of predetermined design dimensions without causing machining deviations in discs made of high tensile strength steel plates. It is something that plays.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明の第1工程を示し、(へ)は打抜き前の
概略説明図、(ロ)は打抜き状態の概略説明図、第2図
は本発明の第2工程を示し、(へ)は加工前の概略説明
図、(ロ)は加工状態の概略説明図、第3図は従来の第
1工程を示し、(へ)は打抜き前の概略説明図、(ロ)
は打抜き状態の概略説明図、第4図は従来の第2工程を
示し、mlは加工前の概略説明図、(ロ)は加工状態の
概略説明図である。 (1)・・・・・・・・・・・・ディスク   (2)
・・・・・・膨出部(3)、 (10)・・・・・・下
型 (4)・・・・・・・・・・・・打抜きダイス(5)・
・・・・・・・・・・・打抜きポンチ (6)・・・・
・・刃部(7)・・・・・・・・・・・・ダイス頂部 
 (8)・・・・・・下穴(9)・・・・・・・・・・
・・陥没部(11)・・・・・・・・・・・・コイニン
グダイス(12)・・・・・・・・・・・・コイニング
ポンチ(13)・・・・・・・・・・・・バーリング部
(14)・・・・・・・・・・・・コイニング部 (1
5)・・・・・・凹部(16)・・・・・・・・・・・
・ボルト穴(17)・・・・・・・・・・・・ナツト産
地  1  口 (イ) 躬  2  記 (イ) 第 3 図 (イ)              (ロ)鴇 4  
FIG. 1 shows the first step of the present invention, (f) is a schematic explanatory diagram before punching, (b) is a schematic explanatory diagram of the punched state, and FIG. ) is a schematic explanatory diagram before processing, (b) is a schematic explanatory diagram of the processing state, FIG. 3 shows the conventional first step, (f) is a schematic explanatory diagram before punching, (b)
4 is a schematic explanatory diagram of the punching state, FIG. 4 is a conventional second step, ml is a schematic explanatory diagram before processing, and (b) is a schematic explanatory diagram of the processing state. (1)・・・・・・・・・Disc (2)
...Bulging part (3), (10) ...Lower die (4) ...Punching die (5)
・・・・・・・・・ Punch punch (6)・・・
・Blade part (7)・・・・・・・・・Dice top
(8)・・・Prepared hole (9)・・・・・・・・・
・・Concave part (11)・・・・・・・・・・・・Coining die (12)・・・・・・・・・・・・Coining punch (13)・・・・・・・・・... Burring part (14) ... Coining part (1
5)・・・Concavity (16)・・・・・・・・・・・・
・Bolt hole (17)・・・・・・・・・Nut production area 1 Kuchi (a) Tsumugi 2 Note (a) Figure 3 (a) (b) Toki 4
circle

Claims (1)

【特許請求の範囲】[Claims] 絞り成形によって形成されたディスクの膨出部に、ボル
ト穴直径より小さな直径の下穴を打抜き加工する第1工
程と、上記下穴を所定の直径にバーリング加工してボル
ト穴に仕上げると共に、ボルト穴周囲にコイニング加工
を施してテーパ面あるいは球面のナット座を形成する第
2工程とからなるボルト穴加工方法であって、上記第1
工程において下穴の打抜き加工と同時に下穴周辺部分の
陥没変形加工を行なうことを特徴とするホイールディス
クのボルト穴加工方法。
The first step is punching a pilot hole with a smaller diameter than the bolt hole diameter into the bulge of the disk formed by drawing, and finishing the bolt hole by burring the pilot hole to a predetermined diameter. A bolt hole machining method comprising a second step of coining around the hole to form a tapered or spherical nut seat, the method comprising:
A bolt hole machining method for a wheel disc characterized by punching a pilot hole and simultaneously performing depression deformation around the pilot hole in the process.
JP30138790A 1990-11-07 1990-11-07 Wheel disk bolt hole machining method Expired - Lifetime JPH07108424B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP30138790A JPH07108424B2 (en) 1990-11-07 1990-11-07 Wheel disk bolt hole machining method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP30138790A JPH07108424B2 (en) 1990-11-07 1990-11-07 Wheel disk bolt hole machining method

Publications (2)

Publication Number Publication Date
JPH04172134A true JPH04172134A (en) 1992-06-19
JPH07108424B2 JPH07108424B2 (en) 1995-11-22

Family

ID=17896261

Family Applications (1)

Application Number Title Priority Date Filing Date
JP30138790A Expired - Lifetime JPH07108424B2 (en) 1990-11-07 1990-11-07 Wheel disk bolt hole machining method

Country Status (1)

Country Link
JP (1) JPH07108424B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0871680A (en) * 1994-09-02 1996-03-19 Kyoei Seiko Kk Method for forming annular body with cold press

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0871680A (en) * 1994-09-02 1996-03-19 Kyoei Seiko Kk Method for forming annular body with cold press

Also Published As

Publication number Publication date
JPH07108424B2 (en) 1995-11-22

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