JPS60216944A - Forging method - Google Patents
Forging methodInfo
- Publication number
- JPS60216944A JPS60216944A JP7195584A JP7195584A JPS60216944A JP S60216944 A JPS60216944 A JP S60216944A JP 7195584 A JP7195584 A JP 7195584A JP 7195584 A JP7195584 A JP 7195584A JP S60216944 A JPS60216944 A JP S60216944A
- Authority
- JP
- Japan
- Prior art keywords
- billet
- diameter hole
- hole
- forging
- large diameter
- 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
Links
Landscapes
- Forging (AREA)
Abstract
Description
【発明の詳細な説明】
Ａ０発明の目的
（１）産業上の利用分野
本発明は、丸棒状のビレットを、該ビレットに対応した
大径でありかつ円錐状の底部を有する大径孔および前記
底部に開口して大径孔に連通した小・径孔を有する下型
と、前記大径孔に抑圧挿入されるポンチとで押込み鍛造
し、前記大径孔に対応した大径の頭部と小径孔に対応し
た軸部とを成形する鍛造方法に関する。Detailed Description of the Invention A0 Object of the Invention (1) Industrial Field of Application The present invention provides a round bar-shaped billet with a large diameter hole corresponding to the billet and having a conical bottom; Forging is performed using a lower die having a small diameter hole opening at the bottom and communicating with the large diameter hole, and a punch inserted into the large diameter hole under pressure, and a large diameter head corresponding to the large diameter hole is formed. The present invention relates to a forging method for forming a shaft portion corresponding to a small diameter hole.
（２）従来の技術
従来、かかる鍛造方法は、丸棒状ビレットから、軸部の
一端に傘部な備える内燃機関の吸、排気弁を鍛造成形す
る際の途中の工程に用られており、大径孔にビレットを
挿入した後、ポンチで加圧することにより、軸部を押出
し成形している。 −（３）発明が解決しようとする問
題点
ところで、このような従来からの鍛造方法において、押
出成形性を向上するために、大径孔の内面には鍛造に先
立って潤滑油が塗布される。ところが、大径孔にビレッ
トを挿入してポンチで加圧する際には、ビレットが大径
孔の底部に向けて加圧されるので、大径孔の内面に塗布
された潤滑油の小径孔介の流下が阻止され、押出成形性
が向上するとは言い難かった。。(2) Conventional technology Conventionally, such forging methods have been used in the process of forging intake and exhaust valves for internal combustion engines, which have an umbrella portion at one end of the shaft, from round billets. After inserting the billet into the diameter hole, the shaft is extruded by applying pressure with a punch. -(3) Problems to be solved by the invention By the way, in such conventional forging methods, lubricating oil is applied to the inner surface of the large diameter hole prior to forging in order to improve extrusion formability. . However, when inserting a billet into a large-diameter hole and pressurizing it with a punch, the billet is pressurized toward the bottom of the large-diameter hole, so the lubricating oil applied to the inner surface of the large-diameter hole is absorbed through the small-diameter hole. It was difficult to say that the extrusion moldability was improved because the flow of the resin was prevented. .
本発明は、そのような事情に鑑みてなされたものであり
、潤滑油の小径孔内への流下を促進して押出し成形性を
向上させた鍛造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 circumstances, and an object of the present invention is to provide a forging method that improves extrusion formability by promoting the flow of lubricating oil into small-diameter holes.
Ｂ０発明の構成
（１） 問題点を解決するための手段
上記目的を達成するために、本発明では、ビレットの一
端に、大径孔を挿入したときに円錐状底部と協働して潤
滑油溜りを画成すべく、鍛造に先立ってテーパ面を形成
する。B0 Structure of the Invention (1) Means for Solving the Problems In order to achieve the above object, in the present invention, when a large diameter hole is inserted into one end of the billet, lubricating oil is released in cooperation with the conical bottom. A tapered surface is formed prior to forging to define the reservoir.
（２）作 用
潤滑油溜りを画成することにより、大径孔の内面に塗布
された潤滑油がビレットの大径孔への挿入に応じて潤滑
油溜りに溜められ、軸部の押出し鍛造時に小径孔に流下
して、軸部の押出し成形性が向上する。(2) Function By defining the lubricating oil reservoir, the lubricating oil applied to the inner surface of the large diameter hole is collected in the lubricating oil reservoir as the billet is inserted into the large diameter hole, and the extrusion forging of the shaft part is performed. Sometimes it flows down into the small diameter hole, improving the extrusion moldability of the shaft.
（３）実施例
以下、図面により本発明の一実施例について説明すると
、先ず第１図において、第１図（α）で示す丸棒状ビレ
ット１が図示しない押出し鍛造金型装置で鍛造され、第
１図（ｃ）で示すように軸部３の一端に大径の頭部４を
有する素材２が形成されるが、この鍛造に先立って、ビ
レット１の一端にはテーパ面１αが第１図（ｈ）で示す
ように形成される。また素材２はさらに第１図（ｄ）で
示すように鍛造成形され、その後、数次の加工工程を経
て、内燃機関用バルブが成形される。(3) Example Hereinafter, an example of the present invention will be explained with reference to the drawings. First, in FIG. 1, a round bar-shaped billet 1 shown in FIG. As shown in Fig. 1(c), a material 2 having a large-diameter head 4 at one end of the shaft portion 3 is formed, but prior to this forging, a tapered surface 1α is formed on one end of the billet 1 as shown in Fig. 1(c). It is formed as shown in (h). The material 2 is further forged as shown in FIG. 1(d), and then undergoes several processing steps to form a valve for an internal combustion engine.
第２図において、ビレット１から素材２を再出し鍛造す
るため−め金型゛装置５は、下型８とポンチ９とを備え
る。下型８には、ビレット１を挿入すべく該ビレット１
に対応した大径でありしかも円錐状底部１４を備える大
径孔１１と、円錐状底部１４で開口して大径孔１１に同
心に連なる小径孔１２とが穿設されており、小径孔１２
の下部にはエジェクタピン１５が挿入される。またポン
チ９は大径孔１１内に嵌入されるよう外径を有して形成
される。In FIG. 2, a die device 5 for re-forging a material 2 from a billet 1 includes a lower die 8 and a punch 9. The billet 1 is inserted into the lower die 8.
A large diameter hole 11 having a large diameter and a conical bottom 14 corresponding to the above, and a small diameter hole 12 opening at the conical bottom 14 and concentrically connected to the large diameter hole 11 are bored.
An ejector pin 15 is inserted into the lower part of the . Further, the punch 9 is formed to have an outer diameter so that it can be fitted into the large diameter hole 11.
このような金型装置５でビレット１を鍛造するに先立っ
て、ビレット１の一端にはテーパ面１ａが形成されるが
、そのテーパ面１ａは、ビレット１を大径孔１１に挿入
したときに、大径孔１１の円錐状底部１４との間に環状
の潤滑油溜り１３を画成し得るように、円錐状底部１４
の中心角よりも小さい中心角を有して円錐状に形成され
る。Prior to forging the billet 1 with such a mold device 5, a tapered surface 1a is formed at one end of the billet 1. , and the conical bottom 14 of the large diameter hole 11 so that an annular lubricating oil reservoir 13 can be defined between the conical bottom 14 of the large diameter hole 11 and the conical bottom 14 of the large diameter hole 11.
It is formed into a conical shape with a central angle smaller than the central angle of .
金型装置５でビレット１を鍛造するにあたっては大径孔
１１の内面に潤滑油を塗布しておき、加熱状態にあるビ
レット１を、そのテーパ面１ａを下方に向けて大径孔１
１内に挿入する。これにより、前記潤滑油は潤滑油溜り
１３に掻き寄せられる。その後、ポンチ９でビレット１
を加圧することにより、ビレット１は小径孔１２内に押
出され、第１図（Ｃ）で示すような軸部３が成形される
。しかもこの際、潤滑油溜り１３に溜められた潤滑油が
ビレット１の押出しに応じて、その押出し部と小径孔１
２の内面との間を流下して潤滑機能を果すので、軸部３
の押出し成形性が向上する。When forging the billet 1 with the mold device 5, lubricating oil is applied to the inner surface of the large diameter hole 11, and the heated billet 1 is inserted into the large diameter hole 1 with its tapered surface 1a facing downward.
Insert within 1. As a result, the lubricating oil is collected into the lubricating oil reservoir 13. After that, billet 1 with punch 9
By applying pressure, the billet 1 is extruded into the small diameter hole 12, and the shaft portion 3 as shown in FIG. 1(C) is formed. Moreover, at this time, as the billet 1 is extruded, the lubricating oil stored in the lubricating oil reservoir 13 is applied to the extruded part and the small diameter hole 1.
Since it flows down between the inner surface of the shaft part 3 and fulfills the lubricating function,
Improves extrusion moldability.
Ｃ０発明の効果
以上のように本発明によれば、ビレットの一端に、大径
孔に挿入したときに円錐状底部と協働して潤滑油溜りを
画成すべく、鍛造に先立ってテーパ面を形成するように
したので、軸部の押出し時に潤滑油溜りから潤滑油が流
下して潤滑作用を果し、軸部の押出し成形性が向上する
。C0 Effects of the Invention As described above, according to the present invention, a tapered surface is formed at one end of the billet prior to forging so that it cooperates with the conical bottom to define a lubricating oil reservoir when inserted into a large diameter hole. Since the lubricating oil is formed in this manner, when the shaft portion is extruded, the lubricating oil flows down from the lubricating oil reservoir and performs a lubricating action, thereby improving the extrusion moldability of the shaft portion.
図面は本発明の一実施例を示すものであり、第１図（ａ
）〜（ｄ）は鍛造工程の進展に応じたビレットの形状変
化を示す図、第２図は金型装置の要部縦断面図である。
１・・・ビレット、１α・・・テーパ面、３・・・Ｍ部
、 ４・・・頭部、８・・・下型、９・・・ポンチ、１
１・・・大径孔、１２・・・小径孔、１３・・・潤滑油
溜り、１４・・・円錐状底部
特許出願人 本田技研工業株式会社
第１図
６プワ （ｃ） （ｂ） （ａ）
第２図The drawings show one embodiment of the present invention, and FIG.
) to (d) are diagrams showing changes in the shape of the billet as the forging process progresses, and FIG. 2 is a vertical sectional view of the main part of the mold device. 1... Billet, 1α... Tapered surface, 3... M part, 4... Head, 8... Lower die, 9... Punch, 1
1... Large diameter hole, 12... Small diameter hole, 13... Lubricating oil reservoir, 14... Conical bottom Patent applicant Honda Motor Co., Ltd. Figure 1 6 (c) (b) ( a) Figure 2
Claims (1)
かつ円錐状底部を有する大径孔および前記底部に開口し
て大径孔に連通した小径孔を有する下型と、前記大径孔
に抑圧挿入されるポンチとで押込み鍛造し、前記大径孔
に対応した大径の頭部と小径孔に対応した軸部とを成形
する鍛造方法において、前記ビレットの一端に、大径孔
に挿入したときに円錐状底部と協働して潤滑油溜りを画
成すべく、鍛造に先立ってテーパ面を形成することな特
徴とする鍛造方法。A round bar-shaped billet is formed into a lower mold having a large diameter hole corresponding to the billet and having a conical bottom, and a small diameter hole opening in the bottom and communicating with the large diameter hole, and a lower die having a large diameter hole corresponding to the billet and having a conical bottom, and In a forging method in which a large diameter head corresponding to the large diameter hole and a shaft portion corresponding to the small diameter hole are formed by force forging with a punch inserted under pressure, one end of the billet is inserted into the large diameter hole. A forging method characterized by forming a tapered surface prior to forging in order to define a lubricating oil reservoir in cooperation with the conical bottom when the forging is performed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7195584A JPS60216944A (en) | 1984-04-11 | 1984-04-11 | Forging method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7195584A JPS60216944A (en) | 1984-04-11 | 1984-04-11 | Forging method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60216944A true JPS60216944A (en) | 1985-10-30 |
Family
ID=13475413
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7195584A Pending JPS60216944A (en) | 1984-04-11 | 1984-04-11 | Forging method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60216944A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010201457A (en) * | 2009-03-03 | 2010-09-16 | Ngk Spark Plug Co Ltd | Method of producing metallic shell for spark plug |
-
1984
- 1984-04-11 JP JP7195584A patent/JPS60216944A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010201457A (en) * | 2009-03-03 | 2010-09-16 | Ngk Spark Plug Co Ltd | Method of producing metallic shell for spark plug |
| JP4741687B2 (en) * | 2009-03-03 | 2011-08-03 | 日本特殊陶業株式会社 | Manufacturing method of metal shell for spark plug |
| US8322184B2 (en) | 2009-03-03 | 2012-12-04 | Ngk Spark Plug Co., Ltd. | Method of producing metallic shell for spark plug |
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