WO2013114989A1 - 中空エンジンバルブの製造方法 - Google Patents
中空エンジンバルブの製造方法 Download PDFInfo
- Publication number
- WO2013114989A1 WO2013114989A1 PCT/JP2013/051048 JP2013051048W WO2013114989A1 WO 2013114989 A1 WO2013114989 A1 WO 2013114989A1 JP 2013051048 W JP2013051048 W JP 2013051048W WO 2013114989 A1 WO2013114989 A1 WO 2013114989A1
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- WIPO (PCT)
- Prior art keywords
- semi
- finished product
- hollow
- valve
- hollow shaft
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/20—Making machine elements valve parts
- B21K1/22—Making machine elements valve parts poppet valves, e.g. for internal-combustion engines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/001—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass valves or valve housings
- B23P15/002—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass valves or valve housings poppet valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
- F01L3/12—Cooling of valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
- F01L3/12—Cooling of valves
- F01L3/14—Cooling of valves by means of a liquid or solid coolant, e.g. sodium, in a closed chamber in a valve
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2303/00—Manufacturing of components used in valve arrangements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49229—Prime mover or fluid pump making
- Y10T29/49298—Poppet or I.C. engine valve or valve seat making
- Y10T29/49307—Composite or hollow valve stem or head making
- Y10T29/49309—Composite or hollow valve stem or head making including forging
Definitions
- the present invention relates to a method for manufacturing a hollow engine valve including a valve body in which a hollow hole is formed between a valve head portion and a hollow shaft portion connected to the valve head portion.
- a valve main body, a hollow shaft member, and a shaft end sealing member are individually manufactured, and then each member is joined to obtain a hollow engine valve as a finished product. I am doing so.
- a solid round bar as a raw material is formed into a semi-finished product by forging twice, and then the semi-finished product is subjected to necking (squeezing-up processing). The body is molded.
- the solid round bar is formed into a cup-shaped intermediate product by the first forging. After that, the intermediate product is formed into a semi-finished product by the second forging.
- the fork that expands the lower end portion of the intermediate product to the outside is performed to form a semi-finished product umbrella part.
- the level difference not only causes poor drawing during the next necking process, but also becomes a reduced strength portion that receives stress concentration when the hollow engine valve is used.
- the setting range of the inner diameter of the hollow shaft portion (hollow hole) of the valve body formed by necking is determined to some extent from the inner diameter of the semi-finished hollow shaft portion (hollow hole) at the start of necking processing. . Furthermore, since the thickness of the hollow shaft portion in the semi-finished product monotonously increases during necking, the thickness of the hollow shaft portion in the valve body as a finished product is the same as that of the semi-finished product at the start of necking processing. The setting range is determined to some extent from the thickness of the shaft. As a result, it is difficult to manufacture a valve body (hollow engine valve) of any size with the conventional manufacturing method.
- an object of the present invention is to provide a method for manufacturing a hollow engine valve that can simplify the manufacturing process and improve the processing accuracy.
- a method for manufacturing a hollow engine valve according to a first aspect of the present invention for solving the above problem is as follows.
- a solid round bar that is a material of the valve body is formed into a semi-finished product umbrella portion corresponding to the valve umbrella portion and a semi-finished product hollow shaft portion corresponding to the hollow shaft portion by one hot forging.
- a semi-finished product hollow hole corresponding to the hollow hole is formed into a valve body semi-finished product,
- the semi-finished product hollow shaft portion is subjected to a rotary aging process for pressing the outer peripheral surface of the semi-finished product hollow shaft portion while rotating the valve body semi-finished product with respect to the valve body semi-finished product.
- And reducing the diameter of the semi-finished product hollow shaft part For semi-finished product of valve body after rotary aging process, semi-finished product that becomes semi-finished product hollow shaft part, and connection part between semi-finished product valve head part and semi-finished product hollow shaft part The neck of the valve body is narrowed down in stages, thereby reducing the diameter of the semi-finished product hollow shaft portion and increasing the axial length of the semi-finished product hollow shaft portion.
- a semi-finished product is molded into the valve body,
- a shaft end sealing member is joined to an end of the hollow shaft portion of the valve body so as to seal the hollow hole.
- a method for manufacturing a hollow engine valve according to a second invention for solving the above-described problems is as follows.
- a semi-finished product enlarged hole portion having an inner diameter larger than an inner diameter of the semi-finished product hollow hole is processed at a lower end of the semi-finished product hollow hole in the semi-finished product valve head portion.
- a method for manufacturing a hollow engine valve according to a third aspect of the present invention for solving the above-described problem is as follows. Before the necking, the semi-finished product neck is processed so that the semi-finished product neck has a predetermined thickness.
- a method for manufacturing a hollow engine valve according to a fourth aspect of the present invention for solving the above problem is as follows. After the metal sodium for refrigerant is put into the hollow hole, the shaft end sealing member is joined to the end of the hollow shaft portion.
- a solid round bar as a material of the valve body is formed into a valve body semi-finished product by one hot forging, and this valve body semi-finished
- a solid round bar as a material of the valve body is formed into a valve body semi-finished product by one hot forging, and this valve body semi-finished
- FIG. 1 is a schematic configuration diagram of a hot forging press die, and (a) to (d) are diagrams sequentially illustrating operations until a solid round bar is formed into a semi-finished product. It is the figure which showed the mode of the cutting process with respect to the hollow hole of a semi-finished product. It is a schematic block diagram of a rotary aging processing apparatus, (a) is the top view, (b) is the side view.
- FIG. 1 It is the figure which showed the mode of the cutting process with respect to the neck part of a semi-finished product. It is a schematic block diagram of a necking processing apparatus, and is a figure showing an operation until a semi-finished product is molded into a valve body.
- a hollow engine valve 1 manufactured by a manufacturing method according to the present invention is used as an intake valve or an exhaust valve in an engine such as a vehicle.
- a shaft-shaped shaft end sealing member 20 The valve body 10 and the shaft end sealing member 20 are joined between the shaft ends.
- the valve main body 10 has the umbrella-shaped valve umbrella part 10a and the hollow shaft-shaped hollow shaft part 10b, and the inside of the valve main body 10 has the inside.
- the hollow hole 10c is formed so as to conform to the outer shape of the valve head portion 10a and the hollow shaft portion 10b across the valve head portion 10a and the hollow shaft portion 10b.
- coolants can be enclosed in the hollow hole 10c.
- an enlarged diameter hole portion 10d is formed at the lower end of the hollow hole 10c in the valve head portion 10a, and the maximum inner diameter d2 of the enlarged diameter hole portion 10d is larger than the inner diameter of the hollow hole 10c.
- a neck portion 10e is formed between the valve umbrella portion 10a and the hollow shaft portion 10b.
- valve body 10 and the shaft end sealing member 20 can employ, for example, SUH1, SUH3, SUH11, SUH35, SUH38, etc., which are heat resistant steels.
- the valve main body 10 is provided with a valve for a semi-finished product 12 formed by hot forging a solid round bar 11 as a material thereof.
- a valve for a semi-finished product 12 formed by hot forging a solid round bar 11 as a material thereof.
- Cutting to the hollow hole 12c in the umbrella portion 12a rotary aging processing (cold forging processing) to the hollow shaft portion 12b, cutting processing (turning processing) to the neck portion 13e, and the hollow shaft portion 13b and the neck portion 13e.
- the shape is changed from the shape of the semi-finished product 12 to the shape of the semi-finished product 13 by sequentially performing necking processing (squeezing-up processing), and finally formed.
- the necking process is preferably cold forging in which the semi-finished product 13 is held at room temperature from the viewpoint of machining accuracy.
- the semi-finished product 13 is It may be forged in a heated state.
- a solid round bar 11 formed in advance in a predetermined shape is used as a press die 40 for hot forging. Is used to form a semi-finished product 12.
- the press die 40 is composed of a columnar upper die (punch) 41 and a cylindrical lower die 42.
- the lower die 42 is composed of a die block 51, a floating die 52, and a cylinder block 53, and the floating die 52 and the cylinder block 53 are provided on the upper and lower portions of the die block 51, respectively. Yes.
- a cylindrical housing 51a is formed in the center of the die block 51 so as to penetrate the die block 51 in the vertical direction. Further, a core 54 is provided in the housing 51a. It arrange
- a cylindrical knockout pin 55 is disposed in the accommodating portion 51a, and a core 54 is inserted into the hollow hole 55a of the knockout pin 55.
- the flange part 55b is formed in the lower end of the knockout pin 55, and this flange part 55b is supported in the accommodating part 51a so that sliding is possible to an up-down direction.
- a plurality of springs 56 are provided between the inner peripheral surface of the accommodating portion 51 a and the outer peripheral surface of the knockout pin 55. These springs 56 are interposed in a compressed state between the lower surface of the floating die 52 and the flange portion 55 b of the knockout pin 55.
- a cavity 52a is formed at the center of the floating die 52 so as to penetrate the floating die 52 in the vertical direction.
- the upper end of the core 54 is disposed at the center of the cavity 52a, and the upper end of the knockout pin 55 disposed on the radially outer side of the core 54 is located below the cavity 52a from within the cavity 52a. Can be haunted.
- a plurality of pin sliding holes 52b are provided along the circumferential direction in the outer peripheral portion of the floating die 52, and these pin sliding holes 52b pass through the floating die 52 in the vertical direction. Is formed. Further, a sliding pin 57 is slidably supported in the pin sliding hole 52 b, and the lower end of the sliding pin 57 is fixed to the upper part of the die block 51.
- a cylinder portion 53a is formed at the center of the cylinder block 53, and a piston member 58 is supported in the cylinder portion 53a so as to be slidable in the vertical direction. And the upper end of the piston member 58 can penetrate the upper part of the cylinder block 53 and the lower part of the die block 51, and can press the lower surface of the flange part 55 in the accommodating part 51a.
- the solid round bar 11 is preheated at a temperature of 950 to 1200 ° C., for example, before hot forging. Further, when the solid round bar 11 heated within the temperature range is placed on the upper end surface of the core 54, the solid round bar 11 has an upper half or more above from the inside of the cavity 52a. It is in a protruding state.
- the piston member 58 is positioned at the lower limit position in the cylinder portion 53a, so that the knockout pin 55 is also in the storage portion 51a. In FIG. Thereby, the upper surface of the die block 51 and the lower surface of the floating die 52 are in close contact.
- the lower die 42 is raised from the lower limit position until it comes into contact with the upper die 41. Accordingly, the solid round bar 11 is pushed downward by the upper mold 41 so as to cover the upper end of the core 54 in the cavity 52a. That is, the solid round bar 11 is formed into a semi-finished product 12 by filling a space surrounded by the upper die 41, the cavity 52 a, and the core 54.
- the solid round bar 11 can be formed into a semi-finished product 12 by one forging.
- the inner diameter of the hollow hole 12c in the molded semi-finished product 12 is formed at d1.
- the step formed when the solid round bar is formed into the semi-finished product by two forgings as described above. Can be prevented. Thereby, not only can the forging process be simplified, but also the strength of the valve body 10 (hollow engine valve 1) can be improved.
- the lower die 42 of the press die 40 employs a floating structure in which the floating die 52 is levitated by the spring 56, the pressing speed (the movement of the lower die 42 is adjusted) by adjusting the urging force of the spring 56. Speed) can be adjusted.
- the solid round bar 11 when the solid round bar 11 is formed into the semi-finished product 12, the same action as when using a mold for molding while generating back pressure is exhibited.
- the solid round bar 11 can be sufficiently diverted between the valve head portion 12a side and the hollow shaft portion 12b side.
- the semi-finished product 12 molded by the press mold 40 adopting the floating structure is greatly improved in moldability as compared with that molded by the press mold not having the floating structure. .
- the hollow hole 12 c of the semi-finished product 12 obtained by hot forging is cut using a cutting tool 60.
- a cutting tool 60 is prepared.
- the cutting tool 60 includes an axial tool body 61 and a plurality of cutting edges 62 provided at the tip of the tool body 61. Further, the cutting edge 62 is supported so as to be able to appear and retract toward the radially outer side of the tool body 61.
- the cutting tool 60 is moved in the tool rotation axis direction while rotating, and the cutting edge 62 is moved to the tool. Gradually move radially outward. Thereby, the lower end of the hollow hole 12c is cut by the cutting edge 62, and the enlarged diameter hole portion 12d is formed at the lower end.
- the diameter-enlarged hole portion 12 d is formed such that its inner diameter gradually increases toward the bottom surface.
- the inner diameter d2 is larger than the inner diameter d1 of the hollow hole 12c.
- valve head portion 12a in the semi-finished product 12 after hot forging, the valve head portion 12a, the hollow shaft portion 12b, the hollow hole 12c extending between the valve head portion 12a and the hollow shaft portion 12b, And the neck part 12e used as the connection part of the valve head part 12a and the hollow shaft part 12b will be formed.
- the enlarged diameter hole part 12d in the semi-finished product 12 after a cutting process, the enlarged diameter hole part 12d will be formed in the lower end of the hollow hole 12c in the valve head part 12a.
- the finished product enlarged diameter hole portion 12d and the neck portion (semi-finished product neck portion) 12e are a valve head portion 10a, a hollow shaft portion 10b, a hollow hole 10c, an enlarged diameter hole portion 10d, , Corresponding to the neck 10e.
- the semi-finished product 12 obtained by cutting is subjected to a rotary aging processing apparatus 70 for cold forging. Is used to form the semi-finished product 13.
- the rotary aging processing apparatus 70 includes a rotary table 71, a core 72, and dies 73a and 73b.
- the turntable 71 is supported so as to be rotatable around its central axis, and a semi-finished product 12 can be mounted on the upper surface thereof.
- the core 72 is disposed on the same axis as the rotary table 71 above the rotary table 71, and is supported so as to be rotatable about the central axis and movable in the direction of the central axis. .
- the outer diameter of the core 72 is smaller than the inner diameter d1 of the hollow hole 12c in the semi-finished product 12.
- the dies 73a and 73b are arranged to face each other with the central axis of the rotary table 71 and the core 72 as the center. Each pair of the dies 73a and 73b arranged to face each other in this manner is supported so as to approach and separate from each other in the radial direction of the rotary table 71 and the core 72 (semi-finished product 12). 73b are formed in curved surfaces along the outer peripheral surface of the hollow shaft portion 13b in the semi-finished product 13 after the rotary aging process.
- the semi-finished product 12 is formed into the semi-finished product 13 using the rotary aging processing apparatus 70, first, the semi-finished product 12 is semi-finished on the rotary table 71 as shown in FIGS. 5 (a) and 5 (b). After mounting the product 12, the core 72 is inserted into the hollow hole 12 c of the semi-finished product 12. Next, the rotary table 71 and the core 72 are rotated in the same direction, and the core 72 and the semi-finished product 12 are rotated synchronously. Then, the dies 73a and 73b are pressed against the outer peripheral surface of the hollow shaft portion 12b in the rotating semifinished product 12.
- the semi-finished product 12 is formed into the semi-finished product 13 by deforming the hollow shaft portion 12b so that the outer diameter of the hollow shaft portion 12b is reduced and the shaft length of the hollow shaft portion 12b is increased.
- the maximum inner diameter of the enlarged diameter hole portion 13d in the semi-finished product 13 remains d2.
- the hollow shaft portion 12b of the semi-finished product 12 is converted into the semi-finished product 13 before the necking processing. Since the hollow shaft portion 13b can be preliminarily molded, the hollow shaft portion 13b can be easily controlled to an arbitrary size. In addition, by setting the outer diameter of the core 72 and the curvature of the tip surface of the dies 73a and 73b to arbitrary dimensions, the thickness of the hollow shaft portion 13b in the semi-finished product 13 can be made uniform.
- the thickness of the hollow shaft portion 13b can be easily controlled to be thicker or thinner than the thickness of the hollow shaft portion 12b in the semi-finished product 12.
- rotary aging processing without using the core 72 may be used.
- the neck portion 13 e of the semi-finished product 13 obtained by the rotary aging process is cut using a cutting tool 80.
- the outer peripheral surface of the neck 13e in the semi-finished product 13 is turned. Cutting is performed by a cutting tool 80 mounted on the board. Thereby, the outer peripheral surface of the neck portion 13e has an R shape such that the thickness of the neck portion 13e is a predetermined thickness.
- the necking processing by the necking processing device 90 described later is performed. In this case, it is possible to prevent the inner peripheral surface of the neck portion 13e from bulging inward.
- the valve head portion 13a, the hollow shaft portion 13b, and the hollow hole 13c extending between the valve head portion 13a and the hollow shaft portion 13b.
- the diameter-expanded hole portion 13d disposed at the lower end of the hollow hole 13c in the valve head portion 13a and the neck portion 13e serving as a connection portion between the valve head portion 13a and the hollow shaft portion 13b are formed. Further, as shown in FIG. 2 (e), the thickness of the neck 13e is adjusted in the semi-finished product 13 after cutting.
- valve head part (semi-finished product valve head part) 13a the hollow shaft part (semi-finished product hollow shaft part) 13b, the hollow hole (semi-finished product hollow hole) 13c, and the diameter-enlarged hole part (semi-finished part 13).
- the finished product enlarged diameter hole portion 13d and the neck portion (semi-finished product neck portion) 13e are the valve head portion 10a, the hollow shaft portion 10b, the hollow hole 10c, the enlarged diameter hole portion 10d, and the neck portion (semi-finished product neck portion) 13e. , Corresponding to the neck 10e.
- the semi-finished product 13 obtained by the cutting process is used using a necking apparatus 90 for cold forging or warm forging, Molded into the valve body 10.
- the necking processing device 90 is configured to squeeze up the hollow shaft portion 13 b and the neck portion 13 e of the semi-finished product 13 in stages, and finally form the semi-finished product 13 into the valve body 10. is there.
- a bed 91 is provided at the lower part of the necking apparatus 90, and a movable table 92 is supported on the upper part of the bed 91 so as to be movable up and down.
- n cylindrical dies D1, D2,... D (m-1), Dm,... D (n-1), Dn are arranged on the lower surface of the movable base 92 in the conveying direction of the semi-finished product 13. It is provided along.
- the subscript m indicates the mth
- the subscript n indicates the nth (last)
- m and n are m ⁇ n and both are positive integers exceeding 3.
- molding holes M1, M2, M (m-1), Mm, M having a circular cross section are formed in the central part of the dies D1, D2, D (m-1), Dm, D (n-1), Dn.
- molding holes M1, M2, M (m-1), Mm, M having a circular cross section are formed in the central part of the dies D1, D2, D (m-1), Dm, D (n-1), Dn.
- N-1) and Mn are opened downward.
- the inner diameters of the molding holes M1, M2, M (m-1), Mm, M (n-1), and Mn are formed so as to gradually become smaller as they are arranged on the downstream side in the transport direction.
- the semi-finished product 13 and the valve body 10 are formed by molding means M1, M2, M (m-1), Mm, M (n-1), Mn by a conveying means (not shown). It can be conveyed and positioned at a position corresponding to.
- the semi-finished product 13 is formed into the valve body 10 using the necking processing device 90, first, as shown in FIG. Place in position. Next, the conveying operation and positioning operation of the conveying means and the raising / lowering operation of the movable base 92 are alternately performed by the dice D1, D2, D (m ⁇ 1), Dm, D (n ⁇ 1), and Dn. Necking is performed n times. Thereby, the semi-finished product 13 is finally formed into the valve body 10 as a finished product while changing its shape to the shapes of the semi-finished products 13A, 13B, and 13C, for example.
- the outer diameter of the hollow shaft portion 13b and the inner diameter of the hollow hole 13c are gradually reduced.
- the neck portion 13e whose outer peripheral surface has a predetermined R shape is finally changed in its thickness, and finally the neck portion having a predetermined thickness. 10e.
- valve head portion 13a of the semi-finished products 13, 13A to 13C is not in contact with the molding holes M1, M2, M (m-1), Mm, M (n-1), Mn, the semi-finished products.
- the maximum inner diameters of the expanded hole portions 13e of 13, 13A to 13C and the expanded hole portion 10e of the valve body 10 remain d2.
- the shaft end sealing member 20 is hollow so as to close the hollow hole 10c. It joins to the end of shaft part 10b. Thereby, the hollow engine valve 1 can be obtained.
- the semi-finished product 12 after hot forging is cut into the hollow hole 12c to form the enlarged diameter hole portion 12d, but the rotary aging process is performed.
- the subsequent semi-finished product 13 or the semi-finished product 13 after the cutting to the neck portion 13e may be cut to the hollow hole 13c to form the enlarged diameter hole portion 13d.
- the cutting process to the hollow hole 12c in the valve head part 12a, the rotary aging process to the hollow shaft part 12b, a neck part are sequentially performed, but depending on the valve characteristics of the hollow engine valve 1, the hollow hole 12c in the valve head part 12a It does not matter as a manufacturing method excluding cutting and cutting to the neck 13e.
- the solid round bar 11 which is the material of the valve body 10 is formed into a semi-finished product 12 by one hot forging, and then this half
- the manufacturing process can be simplified and the processing accuracy can be improved.
- the hollow shaft portion is pressed by pressing the outer peripheral surface of the hollow shaft portion 12b with the dies 72a and 72b in a state where the core 72 is inserted into the hollow hole 12c of the semi-finished product 12.
- the thickness of 12b (hollow shaft part 13b) can be made uniform. Further, since scratches and dents on the inner peripheral surface of the hollow hole 12b generated during hot forging can be removed, when metallic sodium N is sealed in the hollow engine valve 1, the flow of the metallic sodium N Can be improved. Thereby, the thermal conductivity in the hollow engine valve 1 can be improved.
- the enlarged diameter hole portion 10d of the valve body 10 for the purpose of reducing the weight and improving the thermal conductivity as the enlarged diameter hole portion 12d in advance when the semi-finished product 12 is formed, Since the inner diameter of the hollow hole 12c is larger than the inner diameter of the hollow hole 10c, the expanded hole portion 12d can be easily processed.
- the outer peripheral surface of the neck 13e in the semi-finished product 13 is cut to have a predetermined R shape, and the thickness of the neck 13e is adjusted, so that the half-finished product 13
- the thickness of the neck portion 13e of the finished product 13 (semi-finished products 13A to 13C) can be easily adjusted.
- the thickness of the neck 10e in the valve main body 10 can be easily formed to a predetermined thickness.
- a hollow engine valve that is light in weight and excellent in heat resistance can be easily manufactured, so that it can be beneficially used in, for example, the automobile industry. .
Abstract
Description
弁傘部と当該弁傘部に接続する中空軸部とに亘って中空孔が形成された弁本体を備える中空エンジンバルブの製造方法において、
前記弁本体の素材となる中実丸棒を、1回の熱間鍛造によって、前記弁傘部に対応した半完成品弁傘部と前記中空軸部に対応した半完成品中空軸部とに亘って前記中空孔に対応した半完成品中空孔が形成された弁本体半完成品に成形し、
前記弁本体半完成品に対して、前記弁本体半完成品を回転させながら、前記半完成品中空軸部の外周面を押圧するロータリスエージング加工を行うことにより、前記半完成品中空軸部の径を縮径すると共に、前記半完成品中空軸部の軸長を長くし、
ロータリスエージング加工後の前記弁本体半完成品に対して、前記半完成品中空軸部と、前記半完成品弁傘部と前記半完成品中空軸部との間の接続部分となる半完成品首部とを、段階的に絞り上げるネッキング加工を行うことにより、前記半完成品中空軸部の径を縮径すると共に、前記半完成品中空軸部の軸長を長くして、当該弁本体半完成品を前記弁本体に成形し、
前記弁本体における前記中空軸部の端部に、前記中空孔を封止するように軸端封止部材を接合する
ことを特徴とする。
前記半完成品弁傘部内における前記半完成品中空孔の下端に、内径が前記半完成品中空孔の内径よりも大径となる半完成品拡径孔部を加工する
ことを特徴とする。
ネッキング加工前に、前記半完成品首部が所定の肉厚となるように、当該半完成品首部を加工する
ことを特徴とする。
冷媒用の金属ナトリウムを前記中空孔内に入れた後、前記軸端封止部材を前記中空軸部の端部に接合する
ことを特徴とする。
Claims (4)
- 弁傘部と当該弁傘部に接続する中空軸部とに亘って中空孔が形成された弁本体を備える中空エンジンバルブの製造方法において、
前記弁本体の素材となる中実丸棒を、1回の熱間鍛造によって、前記弁傘部に対応した半完成品弁傘部と前記中空軸部に対応した半完成品中空軸部とに亘って前記中空孔に対応した半完成品中空孔が形成された弁本体半完成品に成形し、
前記弁本体半完成品に対して、前記弁本体半完成品を回転させながら、前記半完成品中空軸部の外周面を押圧するロータリスエージング加工を行うことにより、前記半完成品中空軸部の径を縮径すると共に、前記半完成品中空軸部の軸長を長くし、
ロータリスエージング加工後の前記弁本体半完成品に対して、前記半完成品中空軸部と、前記半完成品弁傘部と前記半完成品中空軸部との間の接続部分となる半完成品首部とを、段階的に絞り上げるネッキング加工を行うことにより、前記半完成品中空軸部の径を縮径すると共に、前記半完成品中空軸部の軸長を長くして、当該弁本体半完成品を前記弁本体に成形し、
前記弁本体における前記中空軸部の端部に、前記中空孔を封止するように軸端封止部材を接合する
ことを特徴とする中空エンジンバルブの製造方法。 - 請求項1に記載の中空エンジンバルブの製造方法において、
前記半完成品弁傘部内における前記半完成品中空孔の下端に、内径が前記半完成品中空孔の内径よりも大径となる半完成品拡径孔部を加工する
ことを特徴とする中空エンジンバルブの製造方法。 - 請求項1に記載の中空エンジンバルブの製造方法において、
ネッキング加工前に、前記半完成品首部が所定の肉厚となるように、当該半完成品首部を加工する
ことを特徴とする中空エンジンバルブの製造方法。 - 請求項1に記載の中空エンジンバルブの製造方法において、
冷媒用の金属ナトリウムを前記中空孔内に入れた後、前記軸端封止部材を前記中空軸部の端部に接合する
ことを特徴とする中空エンジンバルブの製造方法。
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US14/369,385 US9427795B2 (en) | 2012-01-30 | 2013-01-21 | Method for producing a hollow engine valve |
KR1020147017636A KR101649845B1 (ko) | 2012-01-30 | 2013-01-21 | 중공 엔진 밸브의 제조 방법 |
EP13742918.9A EP2811126B1 (en) | 2012-01-30 | 2013-01-21 | Method for producing a hollow engine valve |
CN201380004333.5A CN103998726B (zh) | 2012-01-30 | 2013-01-21 | 空心发动机气门的制造方法 |
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EP (1) | EP2811126B1 (ja) |
JP (1) | JP5950440B2 (ja) |
KR (1) | KR101649845B1 (ja) |
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Cited By (1)
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KR101511558B1 (ko) * | 2013-12-13 | 2015-04-13 | 현대자동차주식회사 | 중공 엔진밸브 및 이의 제조방법 |
CN104741875B (zh) * | 2015-03-25 | 2017-11-03 | 诸城市福日机械有限公司 | 一种半轴套管的加工工艺 |
US10279440B2 (en) * | 2015-05-11 | 2019-05-07 | Huaiji Dengyun Auto-Parts (Holding) Co., Ltd. | Precision forming method of high-efficiency and near-net hollow valve blank of engine |
CN105057998B (zh) * | 2015-08-25 | 2018-06-26 | 重庆创精温锻成型有限公司 | 汽车dct自动变速器外输入轴ⅱ精锻坯制备方法 |
CN106041415B (zh) * | 2016-05-30 | 2018-09-07 | 广东工业大学 | 一种挤压制坯的中空充钠气门成形方法 |
DE102017114509A1 (de) * | 2017-06-29 | 2019-01-03 | Federal-Mogul Valvetrain Gmbh | Hohlraumventil mit optimierter Schaftinnengeometrie und Verfahren zu dessen Herstellung |
DE102017114524A1 (de) * | 2017-06-29 | 2019-01-03 | Federal-Mogul Valvetrain Gmbh | Verfahren zur Herstellung von Hohlraumventilen |
DE102017114554A1 (de) * | 2017-06-29 | 2019-01-03 | Federal-Mogul Valvetrain Gmbh | Verfahren zur Herstellung eines innengekühlten Ventils mit einer Kühlstruktur sowie ein mit dem Verfahren hergestelltes Ventil |
CN110914520B (zh) | 2018-03-20 | 2021-11-16 | 日锻汽门株式会社 | 排气用中空提升阀 |
DE102018112291A1 (de) * | 2018-05-23 | 2019-11-28 | Federal-Mogul Valvetrain Gmbh | Verfahren zur herstellung eines hohlventils für verbrennungsmotoren |
KR102638971B1 (ko) | 2018-11-12 | 2024-02-22 | 가부시키가이샤 니탄 | 엔진의 포핏 밸브의 제조 방법 |
DE102019106209A1 (de) * | 2019-03-12 | 2020-09-17 | Federal-Mogul Valvetrain Gmbh | Verfahren zur Herstellung eines Hohlventils für Verbrennungsmotoren |
DE102019106222A1 (de) * | 2019-03-12 | 2020-09-17 | Federal-Mogul Valvetrain Gmbh | Verfahren zur Herstellung eines Hohlventils für Verbrennungsmotoren |
DE102019106214A1 (de) * | 2019-03-12 | 2020-09-17 | Federal-Mogul Valvetrain Gmbh | Verfahren zur Herstellung eines Hohlventils für Verbrennungsmotoren |
KR20210071623A (ko) | 2019-12-06 | 2021-06-16 | 현대자동차주식회사 | 엔진 밸브의 제조방법 |
EP4129525A4 (en) | 2020-03-30 | 2023-06-14 | Nittan Corporation | METHOD OF MANUFACTURING AN ENGINE POPPET VALVE |
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Also Published As
Publication number | Publication date |
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EP2811126A1 (en) | 2014-12-10 |
EP2811126B1 (en) | 2016-09-07 |
JP2013155676A (ja) | 2013-08-15 |
US20140366373A1 (en) | 2014-12-18 |
US9427795B2 (en) | 2016-08-30 |
KR101649845B1 (ko) | 2016-08-22 |
EP2811126A4 (en) | 2015-07-29 |
JP5950440B2 (ja) | 2016-07-13 |
CN103998726A (zh) | 2014-08-20 |
CN103998726B (zh) | 2017-07-07 |
KR20140092934A (ko) | 2014-07-24 |
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