JPWO2023286227A5 - - Google Patents

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Publication number
JPWO2023286227A5
JPWO2023286227A5 JP2023534531A JP2023534531A JPWO2023286227A5 JP WO2023286227 A5 JPWO2023286227 A5 JP WO2023286227A5 JP 2023534531 A JP2023534531 A JP 2023534531A JP 2023534531 A JP2023534531 A JP 2023534531A JP WO2023286227 A5 JPWO2023286227 A5 JP WO2023286227A5
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Japan
Prior art keywords
manufacturing
engine valve
divided
hollow engine
processes
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Pending
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JP2023534531A
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Japanese (ja)
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JPWO2023286227A1 (en
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Priority claimed from PCT/JP2021/026549 external-priority patent/WO2023286227A1/en
Publication of JPWO2023286227A1 publication Critical patent/JPWO2023286227A1/ja
Publication of JPWO2023286227A5 publication Critical patent/JPWO2023286227A5/ja
Pending legal-status Critical Current

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Claims (6)

軸部と、前記軸部の基端に傘状に拡径する傘部と、少なくとも前記軸部の内部に設けられた中空部とを備える中空エンジンバルブの製造方法であって、
特殊鋼からなる素材である中実丸棒を再結晶温度以上の高温状態とする加熱処理工程と、
前記加熱処理工程で前記高温状態となったワークの一端側を除く胴部を縮径して中間体を成形する搾出加工工程と、
前記中間体において相対的に拡径した前記一端側を傘状に拡径する傘成形工程と、
前記傘成形工程で成形された前記中間体の他端側から軸線に沿って有底の穴を穿設して半完成品を成形する穴明加工工程と、
前記半完成品を冷間で絞り上げる冷間鍛造工程とを含み、
前記冷間鍛造工程を２以上の工程に分割し、前記分割した工程の間に前記ワークを冷却するための冷却工程を設けることを特徴とする中空エンジンバルブの製造方法。A method for manufacturing a hollow engine valve, comprising: a shaft portion; an umbrella portion whose diameter expands in an umbrella shape at a base end of the shaft portion; and at least a hollow portion provided inside the shaft portion, the method comprising:
A heat treatment process in which a solid round bar made of special steel is heated to a high temperature above the recrystallization temperature,
an extrusion processing step of forming an intermediate body by reducing the diameter of the body except for one end side of the workpiece that has reached the high temperature state in the heat treatment step;
an umbrella forming step of expanding the diameter of the relatively expanded end side of the intermediate body into an umbrella shape;
a hole drilling step of forming a semi-finished product by drilling a bottomed hole along the axis from the other end side of the intermediate body formed in the umbrella forming step;
a cold forging step of cold-drawing the semi-finished product;
A method for manufacturing a hollow engine valve, characterized in that the cold forging process is divided into two or more processes, and a cooling process for cooling the workpiece is provided between the divided processes. 前記冷間鍛造工程を第１分割工程、第２分割工程、および第３分割工程の３つの工程に分割し、前記第１分割工程と前記第２分割工程との間、前記第２分割工程と前記第３分割工程との間に、それぞれ前記冷却工程を設けることを特徴とする請求項１に記載の中空エンジンバルブの製造方法。 The cold forging process is divided into three processes: a first division process, a second division process, and a third division process, and between the first division process and the second division process, and between the second division process and 2. The method for manufacturing a hollow engine valve according to claim 1, wherein the cooling step is provided between each of the third dividing steps. 前記冷却工程は、常温環境下において一定時間待機させて前記ワークを冷却することを特徴とする請求項１または２に記載の中空エンジンバルブの製造方法。 3. The method for manufacturing a hollow engine valve according to claim 1, wherein in the cooling step, the workpiece is cooled by standing by for a certain period of time in a normal temperature environment. 前記冷却工程は、送風機により強制的に冷却することを特徴とする請求項１または２に記載の中空エンジンバルブの製造方法。 3. The method for manufacturing a hollow engine valve according to claim 1, wherein the cooling step includes forcibly cooling the valve using a blower. 前記分割した工程は、それぞれ押圧装置、高さ調整装置、ダイユニット、およびダイを備えており、前記高さ調整装置は、前記分割した工程毎に前記ダイユニットの高さを適宜変更することができることを特徴とする請求項１または２に記載の中空エンジンバルブの製造方法。 Each of the divided processes includes a pressing device, a height adjustment device, a die unit, and a die, and the height adjustment device can appropriately change the height of the die unit for each of the divided processes. The method for manufacturing a hollow engine valve according to claim 1 or 2, characterized in that: 前記分割した工程は、それぞれダイの成形孔に潤滑油を添加する潤滑油添加装置を備えており、前記分割した工程毎に設定したタイミングおよび／または設定した量で前記成形孔に潤滑油を添加することを特徴とする請求項１または２に記載の中空エンジンバルブの製造方法。 Each of the divided processes is equipped with a lubricating oil addition device that adds lubricating oil to the forming hole of the die, and the lubricating oil is added to the forming hole at a timing and/or in a set amount for each divided process. The method for manufacturing a hollow engine valve according to claim 1 or 2, characterized in that:
JP2023534531A 2021-07-15 2021-07-15 Pending JPWO2023286227A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2021/026549 WO2023286227A1 (en) 2021-07-15 2021-07-15 Method for manufacturing hollow engine valve

Publications (2)

Publication Number Publication Date
JPWO2023286227A1 JPWO2023286227A1 (en) 2023-01-19
JPWO2023286227A5 true JPWO2023286227A5 (en) 2023-12-05

Family

ID=84919791

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2023534531A Pending JPWO2023286227A1 (en) 2021-07-15 2021-07-15

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JP (1) JPWO2023286227A1 (en)
WO (1) WO2023286227A1 (en)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0696177B2 (en) * 1986-02-05 1994-11-30 富士バルブ株式会社 Engine valve manufacturing method
JP3567264B2 (en) * 1996-10-28 2004-09-22 愛三工業株式会社 Hot extrusion forging die for titanium
JP2000033452A (en) * 1998-07-17 2000-02-02 Fuji Oozx Inc Press apparatus for work
JP2000033453A (en) * 1998-07-17 2000-02-02 Fuji Oozx Inc Press apparatus for work
JP4390291B1 (en) * 2008-09-18 2009-12-24 株式会社 吉村カンパニー Method for manufacturing valve head part of hollow engine valve and hollow engine valve
JP6215156B2 (en) * 2014-08-27 2017-10-18 フジホローバルブ株式会社 Hollow engine valve and manufacturing method thereof
DE102017114554A1 (en) * 2017-06-29 2019-01-03 Federal-Mogul Valvetrain Gmbh A method of manufacturing an internally cooled valve having a cooling structure and a valve made by the method

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