JP2018015774A - Method for forming through-hole by restraining the occurrence of burr - Google Patents
Method for forming through-hole by restraining the occurrence of burr Download PDFInfo
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- JP2018015774A JP2018015774A JP2016147015A JP2016147015A JP2018015774A JP 2018015774 A JP2018015774 A JP 2018015774A JP 2016147015 A JP2016147015 A JP 2016147015A JP 2016147015 A JP2016147015 A JP 2016147015A JP 2018015774 A JP2018015774 A JP 2018015774A
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- 238000000034 method Methods 0.000 title claims abstract description 65
- 230000000452 restraining effect Effects 0.000 title abstract 3
- 238000005520 cutting process Methods 0.000 claims abstract description 31
- 238000004080 punching Methods 0.000 claims abstract description 9
- 239000007787 solid Substances 0.000 claims abstract description 7
- 238000003825 pressing Methods 0.000 claims description 55
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 239000000047 product Substances 0.000 description 24
- 238000005553 drilling Methods 0.000 description 10
- 238000004458 analytical method Methods 0.000 description 8
- 238000003754 machining Methods 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 238000005242 forging Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 241001272720 Medialuna californiensis Species 0.000 description 1
- FFBHFFJDDLITSX-UHFFFAOYSA-N benzyl N-[2-hydroxy-4-(3-oxomorpholin-4-yl)phenyl]carbamate Chemical compound OC1=C(NC(=O)OCC2=CC=CC=C2)C=CC(=C1)N1CCOCC1=O FFBHFFJDDLITSX-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000013065 commercial product Substances 0.000 description 1
- 239000010730 cutting oil Substances 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007730 finishing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
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Abstract
Description
この発明は、基部と軸部を有して、基部の軸部と反対側に突出する少なくとも２つ以上の角（つの）部にバリの発生を抑制して貫通孔を形成する方法に関するものである。 The present invention relates to a method of forming a through-hole having a base portion and a shaft portion and suppressing the occurrence of burrs in at least two or more corner portions that protrude to the opposite side of the shaft portion of the base portion. is there.
従来から機械・自動車部品などを製造するための加工方法として、例えばステアリングを構成する部品であり、図１８に示すように、基部と軸部または中心くり抜きの軸部（以下、まとめて軸部と言う）を有して基部の軸部と反対側に突出する一対の対向して突出する角（つの）部を有する継ぎ手を製造したものがあり、この製造では継ぎ手の軸孔を機械穿削でなく、プレス加工によることとして、製品品質の安定化とバリ取り不要を実現するものが提案されている（特許文献１）。 2. Description of the Related Art Conventionally, as a processing method for manufacturing machine / automobile parts and the like, for example, a part constituting a steering, and as shown in FIG. 18, a base part and a shaft part or a center hollow shaft part (hereinafter collectively referred to as a shaft part). A joint having a pair of oppositely projecting corners projecting on the opposite side of the base shaft, and in this manufacturing, the shaft hole of the joint is machined by mechanical drilling. However, as a press work, a product that stabilizes product quality and eliminates the need for deburring has been proposed (Patent Document 1).
この継ぎ手の角（つの）部のような貫通孔を加工する方法として、たとえば、図１９に示すように、鍛造加工あるいは切削加工等により製造された穿孔前品の一対の対向して突出する角（つの）部に貫通孔を形成する場合に、まず角（つの）部の外側壁から下孔切削を行い、次いで同様に角（つの）部の外側壁から仕上げ切削を行い、貫通孔の内側壁端面に発生するバリ取りを行って完成品を得ている。 As a method of processing a through hole such as the corner (one) of this joint, for example, as shown in FIG. 19, a pair of oppositely projecting corners of a pre-drilling product manufactured by forging or cutting, etc. When forming a through hole in the (one) part, first cut the pilot hole from the outer wall of the corner (one) part, and then similarly finish-cut from the outer wall of the corner (one) part, The finished product is obtained by deburring the wall end face.
このバリ取り加工は、図２０及び図２１に示すように、特殊な専用工具によって行われていた。図２０は裏側のバリを自動面取りする工具（市販品）１００を用いた例であり、工具１００には、切刃１０１ａを有するブレード１０１が支持軸１０２に回動可能に設けられ、ブレード１０１はボール状ガイド１０３によって回動し、バネ１０４によって初期位置に復帰可能に構成されている。 As shown in FIGS. 20 and 21, the deburring process has been performed with a special dedicated tool. FIG. 20 shows an example using a tool (commercially available) 100 for automatically chamfering a burr on the back side. In the tool 100, a blade 101 having a cutting edge 101a is rotatably provided on a support shaft 102. It is configured to be rotated by a ball-shaped guide 103 and to be returned to an initial position by a spring 104.
この工具１００を用いた貫通孔の両端面のバリ取り加工は、図２０（ｃ）に示すように、工具１００の先端部を貫通孔に挿入し、ボール状ガイド１０３がヨークに接触すると、ブレード１０１とバネ１０４によって切刃１０１ａが貫通孔の一方の端面に接触するようになり、この状態で工具１００を軸回転させてバリ取り加工を行う。さらに、工具１００の先端部を貫通孔に挿入させると、ボール状ガイド１０３により貫通孔の内壁を保護するようにしてヨークを貫通し、ブレード１０１がバネ１０４によって回転して初期位置に復帰する。そして、工具１００を引き抜くようにすると、ブレード１０１とバネ１０４によって切刃１０１ａが貫通孔の他方の端面に接触するようになり、この状態で工具１００を軸回転させてバリ取り加工を行い、貫通孔の両端面のバリ取り加工が完了する。 As shown in FIG. 20C, the deburring process of both end faces of the through hole using the tool 100 is performed by inserting the tip end portion of the tool 100 into the through hole and bringing the ball-shaped guide 103 into contact with the yoke. The cutting edge 101a comes into contact with one end face of the through hole by the 101 and the spring 104, and the tool 100 is rotated in this state to perform deburring. Further, when the tip of the tool 100 is inserted into the through-hole, the ball-shaped guide 103 passes through the yoke so as to protect the inner wall of the through-hole, and the blade 101 is rotated by the spring 104 to return to the initial position. When the tool 100 is pulled out, the cutting edge 101a comes into contact with the other end face of the through hole by the blade 101 and the spring 104. In this state, the tool 100 is rotated about its axis to perform deburring. Deburring of both end faces of the hole is completed.
図２１は表側と裏側のバリを自動面取りする工具（市販品）２００を用いた例であり、工具２００には、切刃２０１ａとガイド面０１ｂを有するブレード２０１が出没可能に設けられている。 FIG. 21 shows an example using a tool (commercial product) 200 for automatically chamfering burrs on the front side and the back side. The tool 200 is provided with a blade 201 having a cutting edge 201a and a guide surface 01b so as to be able to appear and retract.
この工具２００を用いた貫通孔の両端面のバリ取り加工は、図２１（ｅ）に示すように、工具２００を軸回転させながら先端部を貫通孔に挿入し、ブレード２０１の切刃２０１ａがヨークに接触すると、切刃２０１ａが貫通孔の一方の端面のバリ取り加工を行い、このバリ取り加工と同時にガイド面０１ｂによってブレード２０１が押し込まれながらスライドしてエッジ加工を行う。さらに、工具２００の軸回転を停止して先端部を貫通孔に挿入させて貫通すると、ブレード２０１が突出して初期位置に復帰する。そして、工具２００を軸回転させながら引き抜くようにすると、切刃２０１ａが貫通孔の他方の端面のバリ取り加工を行い、このバリ取り加工と同時にガイド面０１ｂによってブレード２０１が引き抜かれながらスライドしてエッジ加工を行い、面取り加工が完了する。 As shown in FIG. 21E, the deburring process of both end faces of the through hole using the tool 200 is performed by inserting the tip end into the through hole while rotating the tool 200 about the axis, and the cutting edge 201a of the blade 201 is When contacting the yoke, the cutting edge 201a performs deburring of one end face of the through hole, and simultaneously with this deburring process, the blade 201 is slid while being pushed by the guide surface 01b to perform edge processing. Further, when the shaft rotation of the tool 200 is stopped and the tip portion is inserted into the through hole and penetrated, the blade 201 protrudes and returns to the initial position. Then, when the tool 200 is pulled out while rotating the shaft, the cutting edge 201a deburrs the other end face of the through hole, and simultaneously with this deburring process, the blade 201 slides while being pulled out by the guide surface 01b. Edge processing is performed and chamfering is completed.
貫通孔を機械穿削でなく、プレス加工により形成する場合でも、ファインブランキング法（拘束精密せん断法）では無い特許文献１のようなプレス打ち抜き工法では同文献には記載されていないが、現実的には「かえり」と呼ばれるバリが発生し、製品品質の向上を図るために、バリ取りが要求されていた。また、特許文献１は、プレス加工で穴抜きし、その後は機械穿削等での精密仕上げ工程が無いため、あくまでもせん断面と破断面で構成される断面のままであり、穴直径精度は悪い（例えば、４／１００ｍｍの実現は不可能）。 Even when the through hole is formed by press working instead of mechanical drilling, it is not described in the press punching method such as Patent Document 1 which is not the fine blanking method (restraint precision shearing method), but in reality. In particular, a burr called “kaeri” was generated, and deburring was required to improve product quality. In addition, in Patent Document 1, since there is no precision finishing process such as mechanical drilling after punching by press working, the cross section is composed of a shear surface and a fracture surface, and the hole diameter accuracy is poor. (For example, it is impossible to realize 4/100 mm).
また、図２０及び図２１に示すような従来の自動面取りする工具は、高価であり、しかもφ１０ｍｍ程度の小さい径の孔に限定され、φ１０ｍｍより大きい径の孔を加工する工具は特注で求める必要があった。さらに、継ぎ手のように、一対の対向して突出する角（つの）部に貫通孔を形成する場合には、角（つの）部の外側壁から下孔切削、仕上げ切削を行い、さらに角（つの）部の外側壁からバリ取りを行うため、バリ取り作業が困難で生産性の向上が進展せず、コストダウンが図れない面があった。 Further, the conventional automatic chamfering tools as shown in FIGS. 20 and 21 are expensive and are limited to holes having a small diameter of about φ10 mm, and a tool for machining a hole having a diameter larger than φ10 mm needs to be specially requested. was there. Further, when a through hole is formed in a pair of oppositely projecting corners (one) like a joint, pilot hole cutting and finish cutting are performed from the outer wall of the corners (two), and further corners ( Since the deburring is performed from the outer wall of the two parts, the deburring operation is difficult, the improvement of productivity does not progress, and the cost cannot be reduced.
この発明は、かかる点に鑑みてなされたもので、バリ取り工程が不要で、生産性の向上とコストダウンを図るバリの発生を抑制して貫通孔を形成する方法を提供することを目的とする。 The present invention has been made in view of such a point, and an object thereof is to provide a method of forming a through hole while suppressing the generation of a burr that does not require a deburring step and improves productivity and reduces costs. To do.
前記課題を解決し、かつ目的を達成するために、この発明は、以下のように構成した。 In order to solve the above-described problems and achieve the object, the present invention is configured as follows.
請求項１に記載の発明は、基部と中実の軸部または中空の軸部を有して、前記基部の前記軸部と反対側に突出する少なくとも２つ以上の角（つの）部にバリの発生を抑制して貫通孔を形成する方法であり、
前記少なくとも２つ以上の突出する角（つの）部の外側から内側に向けてプレス加工にて前記少なくとも２つ以上の角（つの）部に貫通孔を打ち抜き形成する孔加工工程と、
前記角（つの）部の内側から前記貫通孔の内側端面にプレス加工にて面取りを行う面取り加工工程と、
面取りされた前記貫通孔の孔内壁を前記角（つの）部の外側から一方向で前記面取り面の一部を残して切削加工する切削加工工程とを有することを特徴とするバリの発生を抑制して貫通孔を形成する方法である。
The invention according to claim 1 has a base portion and a solid shaft portion or a hollow shaft portion, and at least two corner portions (one) projecting to the opposite side of the shaft portion of the base portion are burrs. Is a method of forming a through-hole while suppressing the occurrence of
A hole processing step of punching and forming a through hole in the at least two or more corner (s) by press working from the outside to the inside of the at least two or more protruding corner (s);
A chamfering process for chamfering the inner end face of the through hole from the inside of the corner (one) part by press working;
A chamfering process for cutting the inner wall of the chamfered through-hole in one direction from the outside of the corner portion, leaving a part of the chamfered surface. Thus, a through hole is formed.
請求項２に記載の発明は、前記面取り加工工程において、
前記少なくとも２つ以上の突出する角（つの）部の内側に対向して面取り工具を配置し、
前記面取り工具の間に押圧工具を配置し、
プレスのスライドに取り付けたパンチを降下させることで、前記押圧工具に前記パンチを接触させ、前記プレスの下向き押圧力とは垂直な方向に押圧力の方向を変換し、前記垂直な方向押圧力により前記面取り工具を前記貫通孔の中心軸上を側内壁側から外側方向に移動させて前記貫通孔の側内壁端面にプレス加工にて面取りを行うことを特徴とする請求項１に記載のバリの発生を抑制して貫通孔を形成する方法である。
Invention of Claim 2 is the said chamfering process,
A chamfering tool is disposed opposite to the inside of the at least two protruding corner portions.
Placing a pressing tool between the chamfering tools,
By dropping the punch attached to the slide of the press, the punch is brought into contact with the pressing tool, the direction of the pressing force is changed to a direction perpendicular to the downward pressing force of the press, and the vertical direction pressing force 2. The burr according to claim 1, wherein the chamfering tool is moved on the central axis of the through-hole from the side inner wall side to the outer side to chamfer the end surface of the side inner wall of the through-hole by press working. This is a method of suppressing the generation and forming a through hole.
請求項３に記載の発明は、前記面取り加工工程において、
前記貫通孔の側内壁端面に対向して拡開可能な面取り部を有する工具を配置し、
前記面取り部の間に押圧工具を配置し、
前記垂直な方向押圧力により前記面取り部を前記貫通孔の中心軸上を側内壁側から外側方向に拡開させて前記貫通孔の側内壁端面にプレス加工にて面取りを行うことを特徴と請求項１に記載のバリの発生を抑制して貫通孔を形成する方法である。
According to a third aspect of the present invention, in the chamfering process,
A tool having a chamfered portion that can be expanded opposite to the end surface on the side inner wall of the through hole is disposed,
Placing a pressing tool between the chamfers,
The chamfered portion is expanded from the side inner wall side to the outer side on the central axis of the through hole by the vertical direction pressing force, and the end surface of the side inner wall of the through hole is chamfered by press working. Item 2. A method for forming a through hole while suppressing the generation of burrs according to Item 1.
前記構成により、この発明は、以下のような効果を有する。 With the above configuration, the present invention has the following effects.
請求項１乃至請求項３に記載の発明では、基部と中実の軸部または中空の軸部を有して、基部の軸部と反対側に突出する少なくとも２つ以上の角（つの）部の外側から内側に向けてプレス加工にてそれぞれの角（つの）部に貫通孔を打ち抜き形成し、角（つの）部の内側から貫通孔の内側端面にプレス加工にて面取りを行い、貫通孔の孔内壁を切削加工し、簡単な構成で容易に面取りを行うことで、生産性の向上とコストダウンを図り、かつバリの発生を抑制できるなど製品品質の向上が可能である。 In the invention according to any one of claims 1 to 3, at least two or more corner portions having a base portion and a solid shaft portion or a hollow shaft portion and projecting on the opposite side to the shaft portion of the base portion are provided. Through-holes are punched and formed in each corner part by pressing from the outside to the inside, and chamfering is performed from the inside of the corner part to the inner end face of the through-hole by pressing. By cutting the inner wall of the hole and easily chamfering it with a simple configuration, it is possible to improve the product quality by improving productivity and reducing costs and suppressing the occurrence of burrs.
以下、この発明のバリの発生を抑制して貫通孔を形成する方法の実施の形態について説明する。この発明の実施の形態は、発明の最も好ましい形態を示すものであり、この発明はこれに限定されない。 Hereinafter, an embodiment of a method for forming a through hole while suppressing generation of burrs according to the present invention will be described. The embodiment of the present invention shows the most preferable mode of the present invention, and the present invention is not limited to this.
（バリの発生を抑制して貫通孔を形成する方法の構成）
このバリの発生を抑制して貫通孔を形成する方法の実施の形態を、図１に基づいて説明する。図１はバリの発生を抑制して貫通孔を形成する方法の１例を説明する図である。この実施の形態は、基部と中実の軸部または中空の軸部を有して、基部の軸部と反対側に突出する角（つの）部にバリの発生を抑制して貫通孔を形成する方法であり、孔加工工程Ａと、面取り加工工程Ｂと、切削加工工程Ｃとを有する。鍛造品１は、基部１ａと、貫通孔１ｂ１を有する一対の対向して突出する角（つの）部１ｂと、軸部１ｃが一体形成されてなり、この鍛造品１は、機械加工やダイカスト等の他加工法で加工されたものでもよく、鍛造加工に限定されない。
(Configuration of a method for forming a through hole while suppressing the generation of burrs)
An embodiment of a method for forming a through hole while suppressing the generation of this burr will be described with reference to FIG. FIG. 1 is a diagram illustrating an example of a method for forming a through hole while suppressing the generation of burrs. This embodiment has a base part and a solid shaft part or a hollow shaft part, and suppresses the generation of burrs at the corners (one) projecting on the opposite side of the shaft part of the base part to form a through hole And has a drilling process A, a chamfering process B, and a cutting process C. The forged product 1 is formed by integrally forming a base 1a, a pair of oppositely projecting corners 1b having a through-hole 1b1, and a shaft 1c. The forged product 1 is formed by machining, die casting, or the like. It may be processed by other processing methods, and is not limited to forging.
［孔加工工程Ａ］
孔加工工程Ａは、貫通孔を加工する工程であり、一対の対向して突出する角（つの）部１ｂの外側から内側に向けてプレス加工にてそれぞれの角（つの）部１ｂに貫通孔１ｂ１を打ち抜き形成する。打ち抜き加工は、従来のパンチ金型を用いた加工であり、特に限定されない。
[Drilling process A]
The hole processing step A is a step of processing through-holes, and a through-hole is formed in each corner (one) portion 1b by press working from the outside to the inside of a pair of oppositely projecting corner (one) portions 1b. 1b1 is punched and formed. The punching process is a process using a conventional punch die, and is not particularly limited.
［面取り加工工程Ｂ］
面取り加工工程Ｂは、孔加工工程Ａによって得られた一対の対向して突出する角（つの）部１ｂに形成された貫通孔１ｂ１に対して面取りを行う加工工程であり、角（つの）部１ｂの内側から貫通孔１ｂ１にプレス加工にて面取りを行う。この面取りは、面取りプレス金型を用いた加工であり、以下、面取りプレス金型を用いた実施の形態１，２を説明する。
[Chamfering process B]
The chamfering process B is a machining process in which chamfering is performed on the through-hole 1b1 formed in the pair of oppositely projecting corners (b) obtained in the hole machining process A. Chamfering is performed on the through hole 1b1 from the inside of 1b by pressing. This chamfering is processing using a chamfering press die, and the first and second embodiments using a chamfering press die will be described below.
［切削加工工程Ｃ］
切削加工工程Ｃは、面取り加工工程Ｂによって一対の対向して突出する角（つの）部１ｂの内側端面を面取りされた貫通孔１ｂ１の孔内壁を切削する加工工程である。この切削加工は、従来の切削ドリルを用いて一対の対向して突出する角（つの）部１ｂの外側から一方向で面取り面の一部を残して行い、この切削加工によってバリの発生を抑制する貫通孔の形成が完了する。
[Cutting process C]
The cutting process C is a machining process in which the inner wall of the through hole 1b1 chamfered on the inner end face of the pair of oppositely projecting corners (one) by the chamfering process B is cut. This cutting process is performed by leaving a part of the chamfered surface in one direction from the outside of the pair of oppositely projecting corners (one) using a conventional cutting drill, and the generation of burrs is suppressed by this cutting process. The formation of through-holes is completed.
「面取りプレス金型を用いた実施の形態１」
面取りプレス金型の構成を、図２乃至図８に基づいて説明する。図２は面取りプレス金型の斜視図、図３は金型作動時の斜視図、図４は金型作動時の正面図、図５は金型作動時の平面図、図６は金型作動時の側面図、図７は金型作動時の断面図、図８は面取り部の拡大図である。
“Embodiment 1 using chamfering press die”
The configuration of the chamfering press mold will be described with reference to FIGS. 2 is a perspective view of a chamfering press mold, FIG. 3 is a perspective view when the mold is operated, FIG. 4 is a front view when the mold is operated, FIG. 5 is a plan view when the mold is operated, and FIG. FIG. 7 is a sectional view when the mold is operated, and FIG. 8 is an enlarged view of the chamfered portion.
面取りプレス金型は、受金型２０と、パンチ金型３０を有する。受金型２０は、ボルスター２１と、ボルスター２１に固定された一対の受圧板２２を有し、一対の受圧板２２は対向する位置でボルスター２１に固定されている。一対の受圧板２２の間には、面取りスライド板２３が配置され、この面取りスライド板２３はボルスター２１に固定されている。一対の受圧板２２の間には、一対の面取り工具２４が対向して配置され、この一対の面取り工具２４は面取りスライド板２３上をスライド可能になっている。ボルスター２１には、４個のスプリング止め２５が一対の面取り工具２４に対向して固定され、このそれぞれのスプリング止め２５と一対の面取り工具２４の間には、４個のスプリング２６が配置されている。４個のスプリング２６は、一対の面取り工具２４を常に初期位置へ復帰させるように付勢している。 The chamfering press die has a receiving die 20 and a punch die 30. The mold 20 has a bolster 21 and a pair of pressure receiving plates 22 fixed to the bolster 21, and the pair of pressure receiving plates 22 are fixed to the bolster 21 at opposing positions. A chamfered slide plate 23 is disposed between the pair of pressure receiving plates 22, and the chamfered slide plate 23 is fixed to the bolster 21. A pair of chamfering tools 24 are arranged to face each other between the pair of pressure receiving plates 22, and the pair of chamfering tools 24 can slide on the chamfering slide plate 23. Four spring stoppers 25 are fixed to the bolster 21 so as to face the pair of chamfering tools 24, and four springs 26 are arranged between the respective spring stoppers 25 and the pair of chamfering tools 24. Yes. The four springs 26 urge the pair of chamfering tools 24 to always return to the initial positions.
一対の面取り工具２４の間には、押圧工具２７が配置され、この押圧工具２７は、ボルスター２１に固定された工具ホルダー２８により移動可能に保持されている。押圧工具２７の押圧力により一対の面取り工具２４は、それぞれスプリング２６の付勢力に抗して離間する方向に移動する構成である。工具ホルダー２８には、一対のストローク調整治具２９が設けられ、一対のストローク調整治具２９の長さを調整することで押圧工具２７の移動量を規制し、一対の面取り工具２４の面取りストロークを調整する。 A pressing tool 27 is disposed between the pair of chamfering tools 24, and the pressing tool 27 is held movably by a tool holder 28 fixed to the bolster 21. The pair of chamfering tools 24 are configured to move in a direction away from the urging force of the spring 26 by the pressing force of the pressing tool 27. The tool holder 28 is provided with a pair of stroke adjustment jigs 29, and the amount of movement of the pressing tool 27 is regulated by adjusting the length of the pair of stroke adjustment jigs 29, and the chamfer stroke of the pair of chamfering tools 24. Adjust.
この実施形態の１例である貫通孔形成前の鍛造品１は、一対の対向して突出する角（つの）部１ｂがそれぞれ一対の受圧板２２と一対の面取り工具２４の間に位置し、一対の対向して突出する角（つの）部１ｂの間に一対の面取り工具２４と押圧工具２７が位置するようにセットされる。 In the forged product 1 before forming the through-hole, which is an example of this embodiment, a pair of oppositely projecting corners (one) 1b are positioned between the pair of pressure receiving plates 22 and the pair of chamfering tools 24, respectively. A pair of chamfering tools 24 and a pressing tool 27 are set so as to be positioned between a pair of oppositely projecting corners (one) 1b.
パンチ金型３０は、パンチ３１と、加工品保持ホルダー３２を有する。パンチ３１は、押圧工具２７を押動するように構成される。加工品保持ホルダー３２は、パンチ３１に移動可能に取り付けられ、加工品保持ホルダー３２の先端部に鍛造品１を保持可能に構成されている。加工品保持ホルダー３２の基部には、スプリング３３が組み付けられ、このスプリング３３の付勢力によって加工品保持ホルダー３２が鍛造品１を保持する。 The punch die 30 has a punch 31 and a workpiece holding holder 32. The punch 31 is configured to push the pressing tool 27. The workpiece holding holder 32 is movably attached to the punch 31 and is configured to hold the forged product 1 at the tip of the workpiece holding holder 32. A spring 33 is assembled to the base of the workpiece holding holder 32, and the workpiece holding holder 32 holds the forged product 1 by the biasing force of the spring 33.
押圧工具２７は、断面が楔形状に形成されており、一対のテーパ面２７ａは面取り工具２４のテーパ面２４ａに当接している。面取り工具２４は、面取り面２４ｂを有し、この面取り面２４ｂが角（つの）部１ｂの内側から貫通孔１ｂ１の端面に当接している。 The pressing tool 27 has a wedge-shaped cross section, and the pair of tapered surfaces 27 a are in contact with the tapered surface 24 a of the chamfering tool 24. The chamfering tool 24 has a chamfered surface 24b, and the chamfered surface 24b is in contact with the end surface of the through hole 1b1 from the inside of the corner (one) portion 1b.
プレスのスライドへ締結したパンチ金型３０の下降作動でパンチ３１が押圧工具２７を押動すると、この押圧工具２７の押圧力により一対の面取り工具２４がスライド板２３上を貫通孔１ｂ１の内側から外側に向けて移動する。このように、一対の面取り工具２４が貫通孔１ｂ１の軸方向に移動することで、一対の面取り工具２４の面取り面４ｂが角（つの）部１ｂの内側から貫通孔１ｂ１の端面に押圧され、このプレス加工にて貫通孔１ｂ１の内側端面の面取りを行う。 When the punch 31 pushes the pressing tool 27 by the lowering operation of the punch die 30 fastened to the slide of the press, the pair of chamfering tools 24 moves on the slide plate 23 from the inside of the through hole 1b1 by the pressing force of the pressing tool 27. Move outward. In this way, the pair of chamfering tools 24 moves in the axial direction of the through hole 1b1, so that the chamfered surfaces 4b of the pair of chamfering tools 24 are pressed from the inside of the corner (one) portion 1b to the end surface of the through hole 1b1. The chamfering of the inner end face of the through hole 1b1 is performed by this press working.
次に、この実施の形態の面取り加工を解析モデルに基づいて説明する。図９は解析モデルの斜視図、図１０は解析モデルの断面図、図１１は解析結果を示す図、図１２は押圧工具の移動量と面取り荷重の関係を示す図である。 Next, the chamfering process of this embodiment will be described based on an analysis model. 9 is a perspective view of the analysis model, FIG. 10 is a cross-sectional view of the analysis model, FIG. 11 is a view showing the analysis result, and FIG. 12 is a view showing the relationship between the moving amount of the pressing tool and the chamfering load.
この解析モデルは、面取り加工工程において、鍛造品の一対の対向して突出する角（つの）部を有し、一対の対向して突出する角（つの）部の内側に対向して一対の面取り工具を配置し、一対の面取り工具の間に押圧工具を配置し、一対の対向して突出する角（つの）部の外側にはそれぞれ受圧板を配置した構成である（図１０（ａ））。 This analytical model has a pair of oppositely projecting corners (for) in a chamfering process, and a pair of chamfers facing the inside of the pair of oppositely projecting corners (for). A tool is arranged, a pressing tool is arranged between a pair of chamfering tools, and a pressure receiving plate is arranged outside each of a pair of oppositely projecting corners (FIG. 10 (a)). .
この解析モデルにおいて、プレス可動部を降下させてそれに取り付けられたパンチ３１により押圧工具を押すことで、この押圧工具の押圧力により一対の面取り工具を鍛造品の貫通孔の内側端面から外側に向けて孔軸方向に移動する。一対の面取り工具が面取りスライド板上をスライドして移動することで、この一対の面取り工具は、角（つの）部の内側から貫通孔にプレス加工にて面取りを行う（図１０（ｂ））。 In this analysis model, the press movable part is lowered and the pressing tool is pushed by the punch 31 attached thereto, and the pair of chamfering tools are directed outward from the inner end face of the through hole of the forged product by the pressing force of the pressing tool. Move in the direction of the hole axis. As the pair of chamfering tools slide and move on the chamfering slide plate, the pair of chamfering tools chamfer from the inside of the corner (one) portion to the through hole by press working (FIG. 10B). .
この面取りは、押圧工具の移動量がＤ１からＤ２の間では、面取り荷重がほぼ一定となって安定し（図１２）、面取りプレス加工部は、塑性変形した永久ひずみが生じたことで面取りが可能であることを裏付けている（図１１）。 This chamfering is stable because the chamfering load is almost constant when the amount of movement of the pressing tool is between D1 and D2 (FIG. 12). It confirms that this is possible (FIG. 11).
「面取りプレス金型を用いた実施の形態２」
面取りプレス金型の構成を、図１３及び図１４に基づいて説明する。図１３は面取りプレス金型の斜視図、図１４は金型作動を示す図である。
“Embodiment 2 using chamfering press mold”
The configuration of the chamfering press mold will be described with reference to FIGS. 13 and 14. FIG. 13 is a perspective view of a chamfering press die, and FIG. 14 is a view showing die operation.
面取りプレス金型は、受金型４０と、パンチ金型５０を有する。受金型４０は、固定台４１を有し、この固定台４１は鍛造品１を固定保持可能に構成されている。また、固定台４１には、押圧工具４２が一体に形成されている。 The chamfering press die has a receiving die 40 and a punch die 50. The receiving die 40 has a fixed base 41, and the fixed base 41 is configured to fix and hold the forged product 1. A pressing tool 42 is integrally formed on the fixed base 41.
パンチ金型５０は、拡開可能な一対の面取り部５１ａを有する工具５１を有し、この一対の面取り部５１ａに対向して受圧板部５２が設けられている。一対の面取り部５１ａには、円形状で突出する加工部５１ａ１が形成されている。この加工部５１ａ１は、面取り部５１ａの先端側５１ａ１１が低く、根本側５１ａ１２が高くなるように傾斜させて形成されており、一対の面取り部５１ａの面取り加工時の開き角度において、一対の面取り部５１ａの加工部５１ａ１の加工面５１ａ１１が平行になるように構成されている。 The punch die 50 has a tool 51 having a pair of chamfered portions 51a that can be expanded, and a pressure receiving plate portion 52 is provided facing the pair of chamfered portions 51a. The pair of chamfered portions 51a is formed with a processing portion 51a1 protruding in a circular shape. The processed portion 51a1 is formed so as to be inclined so that the tip side 51a11 of the chamfered portion 51a is low and the root side 51a12 is high, and the pair of chamfered portions 51a1 is open at the time of chamfering the pair of chamfered portions 51a. It is comprised so that the process surface 51a11 of the process part 51a1 of 51a may become parallel.
面取り加工工程において、鍛造品１を受金型４０の固定台４１にセットし、プレスのスライドへ締結したパンチ金型５０を下降させる（図１４（ａ））。このパンチ金型５０の下降によって、鍛造品１の一対の対向して突出する角（つの）部１ｂの内側に対向して拡開可能な一対の面取り部５１ａを有する工具５１が下降し、一対の面取り部５１ａの間に押圧工具４２が配置される（図１４（ｂ））。さらに、パンチ金型５０を下降させることによって、一対の面取り部５１ａの間に押圧工具４２が当接し、これによる押圧工具４２の押圧力により一対の一対の面取り部５１ａを貫通孔１ｂ１の軸方向に拡開させ、角（つの）部１ｂの内側から一対の面取り部５１ａの加工部５１ａ１によって貫通孔１ｂ１にプレス加工にて面取りを行う（図１４（ｃ））。 In the chamfering process, the forged product 1 is set on the fixing base 41 of the receiving die 40, and the punch die 50 fastened to the slide of the press is lowered (FIG. 14 (a)). With the lowering of the punch die 50, the tool 51 having a pair of chamfered portions 51a that can be expanded to oppose the inside of the pair of oppositely projecting corners (one) 1b of the forged product 1 is lowered. The pressing tool 42 is disposed between the chamfered portions 51a (FIG. 14B). Further, by lowering the punch die 50, the pressing tool 42 abuts between the pair of chamfered portions 51a, and the pair of chamfered portions 51a are moved in the axial direction of the through hole 1b1 by the pressing force of the pressing tool 42 thereby. Then, the through hole 1b1 is chamfered by press working from the inside of the corner (one) portion 1b by the processed portion 51a1 of the pair of chamfered portions 51a (FIG. 14C).
（バリ発生の抑制効果）
このバリの発生を抑制して貫通孔を形成する方法では、鍛造品は、一対の対向して突出する角（つの）部を有し、この角（つの）部の外側から内側に向けてプレス加工にてそれぞれの角（つの）部に貫通孔を打ち抜き形成し、角（つの）部の内側から貫通孔の内側端面にプレス加工にて面取りを行い、貫通孔の孔内壁を切削加工する簡単な構成で、一対の対向して突出する角（つの）部にバリ発生を抑制した貫通孔を形成することができる。このような工程で貫通孔を形成することで、生産性の向上とコストダウンを図り、かつ製品品質の向上が可能である。
(Suppression effect of burr generation)
In the method of forming the through-hole while suppressing the generation of this burr, the forged product has a pair of oppositely projecting corner portions and presses from the outside to the inside of the corner portions. Easily cut through the inner wall of the through hole by punching and forming through holes at each corner (cut) by machining, chamfering from the inside of the corner (press) to the inner end face of the through hole With such a configuration, it is possible to form a through hole in which burr generation is suppressed at a pair of oppositely projecting corners. By forming the through hole in such a process, productivity and cost can be reduced, and product quality can be improved.
［比較例１］
図１５の比較例に示すように、鍛造品に一対の対向して突出する角（つの）部の外側からプレス加工によって貫通孔を打ち抜き形成すると、貫通孔の孔内壁面にビビり傷が生じ、内側端部に「かえり」と呼ばれるバリが生じる。このため、貫通孔の孔内壁面を切削加工してビビり傷を除去し、バリ取り加工を行うことになるが、一対の対向して突出する角（つの）部の内側からのバリ取り加工が困難であった。
[Comparative Example 1]
As shown in the comparative example of FIG. 15, when a through hole is formed by punching from the outside of a pair of oppositely projecting corners (one) on a forged product, a crack is generated on the inner wall surface of the through hole, A burr called “kaeri” occurs at the inner end. For this reason, the inner wall surface of the through hole is cut to remove the cracks and the deburring process is performed. However, the deburring process from the inside of the pair of oppositely projecting corners (two) is performed. It was difficult.
［比較例２］
切削条件（回転数，刃数，送り速度，切削油の種類等）を絞り込むため、マシニングセンターを利用して、切削長さ２８ｍｍのＡ６０６１−Ｔ６材料を用い、ヨーク鍛造品の一対の対向して突出する角（つの）孔の精密切削を想定したテスト加工を実施した。穴開け工具は、リーマ工具（刃径２６．５ｍｍ、刃径公差ｍ５、刃長４１ｍｍ、全長２３０ｍｍ、刃数６、ネジレ角３０°）とした。図１６（ａ）は切削加工の様子を示し、図１６（ｂ）は切削加工の結果を示し、図１６（ｃ）は、主軸回転数を３１８０ｒｍｐ、送りＦ１５９０、穴開け前のＣ０．５面取り有りの条件で、穴の直径バラツキが最小となり、切り粉も孔内面に残存しない最適条件を絞り込むことができたが、切削加工後にバリが発生する様子を示したものである。図１６（ｄ）は面取りを行った後、面取り面の一部を残して切削孔空けするとバリが消滅することを示す図であり、切削加工のバリを消滅させるには、面取りを行った後、面取り面の一部を残して切削孔空けすればよいことが確認できた。
[Comparative Example 2]
To narrow down the cutting conditions (number of rotations, number of blades, feed rate, type of cutting oil, etc.), using a machining center, A6061-T6 material with a cutting length of 28 mm, a pair of oppositely protruding yoke forgings Test machining was performed assuming precise cutting of the corner holes. The drilling tool was a reamer tool (blade diameter 26.5 mm, blade diameter tolerance m5, blade length 41 mm, total length 230 mm, number of blades 6, twist angle 30 °). 16A shows the state of cutting, FIG. 16B shows the result of cutting, and FIG. 16C shows the spindle rotation speed of 3180 rpm, feed F1590, and C0.5 chamfer before drilling. In the present condition, the hole diameter variation is minimized and the optimum condition in which the chips do not remain on the inner surface of the hole can be narrowed down, but this shows a state in which burrs are generated after cutting. FIG. 16 (d) is a diagram showing that burrs disappear when chamfering is performed and a part of the chamfered surface is left to make a drilling hole. In order to eliminate cutting burrs, chamfering is performed. It was confirmed that it was sufficient to leave a part of the chamfered surface to make a cutting hole.
（適用例）
この実施形態により貫通孔を形成する鍛造品の例を図１７に示し、図１８に使用例を示すが、この発明の適用対象は、基部と軸部を有して、基部の軸部と反対側に一対の対向して突出する貫通孔を有する角（つの）部とが一体形成されてなるものであれば、特に限定されない。
(Application example)
An example of a forged product that forms a through hole according to this embodiment is shown in FIG. 17 and an example of use is shown in FIG. 18, but the object of application of the present invention is that it has a base portion and a shaft portion and is opposite to the shaft portion of the base portion. There is no particular limitation as long as a corner (one) having a pair of oppositely projecting through holes on the side is integrally formed.
図１７及び図１８に示す鍛造品は、自動車におけるステアリングを構成する継ぎ手であり、鍛造品は、円筒台の上部に２つの角（つの）を有し、角（つの）の外端は、円筒台外形の外側である。円筒台の外形は段付きであり、円筒台の外形のうち、上段付き部はテーパ形状である。円筒台の上部に角錐台が付属している。角（つの）の外形は、半月と角錐台から構成され、角（つの）の側面外形は、上方へシュリンク、角（つの）の正面外形は、上方へシュリンクする。角（つの）の貫通孔は、段付きである。円筒台の内形は、段付きであり、円筒台の内形における上部段付形状は、角錐台の上端形状と同じであり、これにより、回転対称では無く、異断面形状となっている。２つの角（つの）間の空間形状は、ストレートと段付きの組み合せとなっている。 The forged product shown in FIGS. 17 and 18 is a joint constituting a steering in an automobile, and the forged product has two corners at the upper part of the cylindrical base, and the outer ends of the corners are cylindrical. It is outside the outer shape of the base. The outer shape of the cylindrical table is stepped, and the upper stepped portion of the cylindrical table has a tapered shape. A pyramid is attached to the upper part of the cylindrical base. The outer shape of the corner (one) is composed of a half moon and a truncated pyramid, the lateral outer shape of the corner (one) shrinks upward, and the front outer shape of the corner (one) shrinks upward. The corner through holes are stepped. The inner shape of the cylindrical table is stepped, and the upper stepped shape in the inner shape of the cylindrical table is the same as the upper end shape of the truncated pyramid, so that it is not rotationally symmetric but has a different cross-sectional shape. The space shape between the two corners is a combination of straight and stepped.
この発明は、基部と軸部を有して、基部の軸部と反対側に突出する少なくとも２つ以上の角（つの）部にバリの発生を抑制して貫通孔を形成する方法に適用可能であり、生産性の向上とコストダウンを図り、かつ製品品質の向上を可能とする。 The present invention can be applied to a method of forming a through hole having a base portion and a shaft portion and suppressing generation of burrs in at least two or more corner portions protruding to the opposite side of the shaft portion of the base portion. Therefore, it is possible to improve productivity, reduce costs, and improve product quality.
Ａ 孔加工工程
Ｂ 面取り加工工程
Ｃ 切削加工工程
１ 鍛造品
１ａ 基部
１ｂ 一対の対向して突出する角（つの）部
１ｂ１ 貫通孔
１ｃ 軸部
２０ 受金型
２１ ボルスター
２２ 一対の受圧板
２３ 面取りスライド板
２４ 一対の面取り工具
２５ スプリング止め
２６ スプリング
２７ 押圧工具
２８ 工具ホルダー
２９ ストローク調整治具
３０ パンチ金型
３１ パンチ
３２ 加工品保持ホルダー
３３ スプリング
４０ 受金型
４１ 固定台
４２ 押圧工具
５０ パンチ金型
５１ 一対の面取り部５１ａを有する工具
５２ 受圧板部
A Hole drilling process B Chamfering process C Cutting process 1 Forged product 1a Base 1b A pair of oppositely projecting corners (one) 1b1 Through hole 1c Shaft 20 Receptacle mold 21 Bolster 22 A pair of pressure receiving plates 23 Chamfering slide Plate 24 A pair of chamfering tools 25 Spring stopper 26 Spring 27 Press tool 28 Tool holder 29 Stroke adjusting jig 30 Punch die 31 Punch 32 Workpiece holding holder 33 Spring 40 Receiving die 41 Fixing base 42 Press tool 50 Punch die 51 Tool 52 pressure receiving plate portion having a pair of chamfered portions 51a
請求項１に記載の発明は、基部と中実の軸部または中空の軸部を有して、前記基部の前記軸部と反対側に突出する少なくとも２つ以上の角（つの）部にバリの発生を抑制して貫通孔を形成する方法であり、
前記少なくとも２つ以上の突出する角（つの）部の外側から内側に向けてプレス加工にて前記少なくとも２つ以上の角（つの）部に貫通孔を打ち抜き形成する孔加工工程と、
前記角（つの）部の内側から前記貫通孔の内側端面にプレス加工にて面取りを行う面取り加工工程と、
面取りされた前記貫通孔の孔内壁を前記角（つの）部の外側から一方向で前記面取り面の一部を残して切削加工する切削加工工程とを有し、
前記面取り加工工程は、
前記軸部の軸方向に働く加工押圧力を、前記貫通孔の軸方向に変換する変換機構を備え、
加工押圧力を前記変換機構により前記貫通孔の軸方向に変換して前記貫通孔の内側端面にプレス加工にて面取りを行うことを特徴とするバリの発生を抑制して貫通孔を形成する方法である。
The invention according to claim 1 has a base portion and a solid shaft portion or a hollow shaft portion, and at least two corner portions (one) projecting to the opposite side of the shaft portion of the base portion are burrs. Is a method of forming a through-hole while suppressing the occurrence of
A hole processing step of punching and forming a through hole in the at least two or more corner (s) by press working from the outside to the inside of the at least two or more protruding corner (s);
A chamfering process for chamfering the inner end face of the through hole from the inside of the corner (one) part by press working;
The hole inner wall chamfered the through hole possess a cutting step of cutting, leaving a portion of the chamfered surface in one direction from the outside of the angle (one) portion,
The chamfering process includes
A conversion mechanism that converts a processing pressing force acting in the axial direction of the shaft portion into the axial direction of the through hole,
A method of forming a through hole by suppressing the generation of burrs , wherein the processing pressing force is converted into the axial direction of the through hole by the conversion mechanism and the inner end face of the through hole is chamfered by pressing. It is.
請求項２に記載の発明は、前記面取り加工工程に備える前記変換機構の構成は、
前記少なくとも２つ以上の突出する角（つの）部の内側に対向して面取り工具を配置し、
前記面取り工具の間に押圧工具を配置し、
プレスのスライドに取り付けたパンチを降下させることで、前記押圧工具に前記パンチを接触させ、前記プレスの下向き押圧力とは垂直な方向により押圧力の方向を変換し、前記垂直な方向押圧力により前記面取り工具を前記貫通孔の中心軸上を側内壁側から外側方向に移動させて前記貫通孔の側内壁端面にプレス加工にて面取りを行うことを特徴とする請求項１に記載のバリの発生を抑制して貫通孔を形成する方法である。
As for invention of Claim 2, the structure of the said conversion mechanism with which the said chamfering process is equipped is,
A chamfering tool is disposed opposite to the inside of the at least two protruding corner portions.
Placing a pressing tool between the chamfering tools,
By lowering the punch attached to the slide of the press, the punch is brought into contact with the pressing tool, the direction of the pressing force is changed by a direction perpendicular to the downward pressing force of the press, and the vertical direction pressing force is used. 2. The burr according to claim 1, wherein the chamfering tool is moved on the central axis of the through-hole from the side inner wall side to the outer side to chamfer the end surface of the side inner wall of the through-hole by press working. This is a method of suppressing the generation and forming a through hole.
請求項３に記載の発明は、前記面取り加工工程に備える前記変換機構の構成は、
前記貫通孔の側内壁端面に対向して拡開可能な面取り部を有する工具を配置し、
前記面取り部の間に押圧工具を配置し、
前記垂直な方向押圧力により前記面取り部を前記貫通孔の中心軸上を側内壁側から外側方向に拡開させて前記貫通孔の側内壁端面にプレス加工にて面取りを行うことを特徴とする請求項１に記載のバリの発生を抑制して貫通孔を形成する方法である。
As for invention of Claim 3, the structure of the said conversion mechanism with which the said chamfering process is equipped,
A tool having a chamfered portion that can be expanded opposite to the end surface on the side inner wall of the through hole is disposed,
Placing a pressing tool between the chamfers,
The chamfered portion is expanded from the side inner wall side to the outer side on the central axis of the through hole by the vertical direction pressing force, and the end surface of the side inner wall of the through hole is chamfered by pressing. It is a method of suppressing the generation | occurrence | production of the burr | flash of Claim 1, and forming a through-hole.
請求項１乃至請求項３に記載の発明では、基部と中実の軸部または中空の軸部を有して、基部の軸部と反対側に突出する少なくとも２つ以上の角（つの）部の外側から内側に向けてプレス加工にてそれぞれの角（つの）部に貫通孔を打ち抜き形成し、軸部の軸方向に働く加工押圧力を、貫通孔の軸方向に変換する変換機構を備え、加工押圧力を変換機構により貫通孔の軸方向に変換し、角（つの）部の内側から貫通孔の内側端面にプレス加工にて面取りを行い、貫通孔の孔内壁を切削加工し、簡単な構成で容易に面取りを行うことで、生産性の向上とコストダウンを図り、かつバリの発生を抑制できるなど製品品質の向上が可能である。 In the invention according to any one of claims 1 to 3, at least two or more corner portions having a base portion and a solid shaft portion or a hollow shaft portion and projecting on the opposite side to the shaft portion of the base portion are provided. With a conversion mechanism that punches and forms through holes at each corner (one) by pressing from the outside to the inside, and converts the processing pressing force acting in the axial direction of the shaft portion into the axial direction of the through hole , The processing pressing force is converted into the axial direction of the through hole by the conversion mechanism, the inner end face of the through hole is chamfered from the inside of the corner (part), and the inner wall of the through hole is cut and processed easily. By easily chamfering with a simple structure, it is possible to improve product quality, such as improving productivity and reducing costs, and suppressing the occurrence of burrs.
Claims (3)
前記少なくとも２つ以上の突出する角（つの）部の外側から内側に向けてプレス加工にて前記少なくとも２つ以上の角（つの）部に貫通孔を打ち抜き形成する孔加工工程と、
前記角（つの）部の内側から前記貫通孔の内側端面にプレス加工にて面取りを行う面取り加工工程と、
面取りされた前記貫通孔の孔内壁を前記角（つの）部の外側から一方向で前記面取り面の一部を残して切削加工する切削加工工程とを有することを特徴とするバリの発生を抑制して貫通孔を形成する方法。 It has a base and a solid shaft or a hollow shaft, and suppresses the generation of burrs in at least two or more corners that protrude to the opposite side of the shaft of the base. Is a method of forming,
A hole processing step of punching and forming a through hole in the at least two or more corner (s) by press working from the outside to the inside of the at least two or more protruding corner (s);
A chamfering process for chamfering the inner end face of the through hole from the inside of the corner (one) part by press working;
A chamfering process for cutting the inner wall of the chamfered through-hole in one direction from the outside of the corner portion, leaving a part of the chamfered surface. And forming a through hole.
前記少なくとも２つ以上の突出する角（つの）部の内側に対向して面取り工具を配置し、
前記面取り工具の間に押圧工具を配置し、
プレスのスライドに取り付けたパンチを降下させることで、前記押圧工具に前記パンチを接触させ、前記プレスの下向き押圧力とは垂直な方向により押圧力の方向を変換し、前記垂直な方向押圧力により前記面取り工具を前記貫通孔の中心軸上を側内壁側から外側方向に移動させて前記貫通孔の側内壁端面にプレス加工にて面取りを行うことを特徴とする請求項１に記載のバリの発生を抑制して貫通孔を形成する方法。 In the chamfering process,
A chamfering tool is disposed opposite to the inside of the at least two protruding corner portions.
Placing a pressing tool between the chamfering tools,
By lowering the punch attached to the slide of the press, the punch is brought into contact with the pressing tool, the direction of the pressing force is changed by a direction perpendicular to the downward pressing force of the press, and the vertical direction pressing force is used. 2. The burr according to claim 1, wherein the chamfering tool is moved on the central axis of the through-hole from the side inner wall side to the outer side to chamfer the end surface of the side inner wall of the through-hole by press working. A method of forming a through hole while suppressing generation.
前記貫通孔の側内壁端面に対向して拡開可能な面取り部を有する工具を配置し、
前記面取り部の間に押圧工具を配置し、
前記垂直な方向押圧力により前記面取り部を前記貫通孔の中心軸上を側内壁側から外側方向に拡開させて前記貫通孔の側内壁端面にプレス加工にて面取りを行うことを特徴とする請求項１に記載のバリの発生を抑制して貫通孔を形成する方法。 In the chamfering process,
A tool having a chamfered portion that can be expanded opposite to the end surface on the side inner wall of the through hole is disposed,
Placing a pressing tool between the chamfers,
The chamfered portion is expanded from the side inner wall side to the outer side on the central axis of the through hole by the vertical direction pressing force, and the end surface of the side inner wall of the through hole is chamfered by pressing. The method of forming a through-hole by suppressing generation | occurrence | production of the burr | flash of Claim 1.
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| JPH07124680A (en) * | 1993-10-31 | 1995-05-16 | Riken Tanzou Kk | Forged parts and manufacture thereof |
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