JP2009185655A - Method for manufacturing inlet-exhaust valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing an inlet-exhaust valve capable of simplifying a manufacturing process. <P>SOLUTION: In this method for manufacturing the inlet-exhaust valve 10, incompressible fluid 16 is filled in a bottomed metal first intermediate body 10A at first. Then, cold spinning working is applied on the first intermediate body 10A to form a head part 12 and a stem part 14 (stem part intermediate body 14A) under a condition where the incompressible fluid 16 is sealed in the first intermediate body 10A by a cover member 20. Consequently, the head part 12 and the stem part 14 (stem part intermediate body 14A) can be formed at room temperature. As a result, preheating of the first intermediate body 10A for forming the head part 12 and the stem part 14 (stem part intermediate body 14A), for example, is made unnecessary. Consequently, the manufacturing process can be simplified. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for manufacturing an intake / exhaust valve attached to a combustion chamber of an internal combustion engine.

  Conventionally, various intake and exhaust valves for opening and closing a combustion chamber of an engine of a vehicle such as an automobile have been proposed, and an example thereof is disclosed in Patent Document 1 below.

  The intake / exhaust valve disclosed in Patent Document 1 is hollow. For this reason, the intake and exhaust valves are lightened. Thereby, when this intake / exhaust valve is attached to the combustion chamber of the engine, for example, quicker movement is possible as compared with a solid intake / exhaust valve.

  By the way, when manufacturing the intake / exhaust valve disclosed in Patent Document 1, a semi-finished product formed into a substantially cylindrical shape with a bottom from a heat-resistant steel material is first heated to a temperature of 1250 ° C. Extrusion by an isostatic press is performed using a mold comprising the mold. By this extrusion molding, the semi-finished product of the intake / exhaust valve in which the valve shaft portion and the semifinished portion of the umbrella portion are integrated by extending the diameter of the portion of the semifinished product along the axial direction while reducing the diameter. Mold. Next, using a die composed of an upper die and a lower die, hot plastic working by an isostatic press is performed on the semi-finished portion of the umbrella portion to form the umbrella portion. An intake / exhaust valve is manufactured through the above steps.

Japanese Patent Laid-Open No. 7-102917

  However, in order to perform extrusion molding on the semi-finished product formed into the above-mentioned bottomed substantially cylindrical body, in other words, in order to form the valve shaft portion and the semi-finished portion of the umbrella portion, It is necessary to make the opening end opposite to the bottom tapered so as to be gradually reduced in diameter in the axial direction and to facilitate the work of pushing the semi-finished product into the mold. For this reason, the process which shape | molds the opening edge part of a semi-finished product in said taper shape is required at the pre-process of said extrusion molding. Further, heat treatment is required in advance both when the valve shaft portion is molded and when the umbrella portion is molded.

  Thus, many steps must be taken to manufacture the intake / exhaust valve. For this reason, there existed a fault that a manufacturing process became complicated.

  This invention is made | formed in view of the above, Comprising: It aims at providing the manufacturing method of the intake / exhaust valve which can simplify a manufacturing process.

  The present invention is a method of manufacturing an intake / exhaust valve comprising an umbrella part and a shaft part, and a procedure for filling an incompressible fluid into a metal first intermediate body having a bottomed cylindrical shape, The procedure of sealing the incompressible fluid filled in the inside of the first intermediate by closing the opening of the first intermediate with a lid member, and room temperature spinning processing, the incompressible fluid is Applying to the sealed first intermediate body, forming a second intermediate body composed of a shaft part intermediate body that is an intermediate body of the umbrella part and the shaft part, and from the second intermediate body Removing the lid member, discharging the incompressible fluid from the second intermediate, cutting the end of the shaft intermediate, and closing the opening of the shaft intermediate And a step of forming the shaft portion.

  Further, the present invention is a method for manufacturing an intake / exhaust valve comprising an umbrella part and a shaft part, comprising a projection having an outer diameter equal to or larger than the inner diameter of the shaft part of the intake / exhaust valve, and having a bottomed cylindrical shape Inserting a spinning core for reducing the diameter of the open end of the first intermediate body made of metal into the inside of the first intermediate from the open end of the first intermediate; The room temperature spinning process is performed on the opening end of the first intermediate body in which the spinning core is inserted, so that the opening end of the first intermediate body is reduced in diameter and A step of forming a third intermediate having an umbrella intermediate that is an intermediate, a step of extracting the spinning core from the third intermediate, and an incompressible fluid in the interior of the third intermediate. And a gold having the same outer diameter as the inner diameter of the shaft portion of the intake / exhaust valve A procedure for sealing the incompressible fluid injected into the third intermediate body by inserting a molding core into the opening of the third intermediate body, and an intermediate body between the umbrella part and the shaft part. A press molding using a mold for molding the shaft intermediate is applied to the third intermediate in which the incompressible fluid is sealed, and the umbrella portion and the shaft intermediate are configured. A step of forming a fourth intermediate, a step of removing the mold-forming core from the fourth intermediate, and discharging the incompressible fluid from the fourth intermediate, and the shaft intermediate And a step of forming the shaft portion by closing the opening portion.

  The present invention also relates to a method of manufacturing an intake / exhaust valve including an umbrella part and a shaft part, which has the same melting point as the inner shape of the umbrella part and has a melting point higher than that of the first metallic intermediate body having a bottom. Umbrella molding core made of a low material and an outer diameter that is the same as the inner diameter of the shaft portion of the intake / exhaust valve, and a higher melting point than the umbrella molding core The procedure for inserting the first shaft-forming core into the first intermediate body from the opening end of the first intermediate body, and the room temperature spinning process are carried out using the umbrella-forming core and the first core. A step of forming a fifth intermediate body including the umbrella portion and the shaft portion intermediate body by applying the shaft portion forming core to the first intermediate body inserted therein; and the first shaft The procedure for pulling out the core for molding the part from the fifth intermediate and the core for molding the umbrella by melting the fifth intermediate And a procedure for discharging the fluid of the core for forming the umbrella part from the fifth intermediate body, a procedure for cutting an end of the shaft part intermediate body, and closing an opening portion of the shaft part intermediate body. And a step of forming the shaft portion.

  The present invention also relates to a method of manufacturing an intake / exhaust valve including an umbrella part and a shaft part, which has the same melting point as the inner shape of the umbrella part and has a melting point higher than that of the first metallic intermediate body having a bottom. The opening end portion of the first intermediate body, which is composed of an umbrella forming core made of a low material and a protrusion having an outer diameter equal to or larger than the inner diameter of the shaft portion of the intake / exhaust valve, is reduced. A procedure for inserting a spinning core for diameter into the first intermediate body from the opening end of the first intermediate body, and a room temperature spinning process for the umbrella core forming core and the spinning core. An opening portion of the first intermediate body into which the processing core is inserted is provided on the opening end portion of the first intermediate body so that the opening end portion of the first intermediate body has a reduced diameter and is an intermediate body of the umbrella portion A step of forming a sixth intermediate body having an intermediate body, and the spinning core as the sixth intermediate body; A second shaft-forming core that is made of a material having the same outer diameter as the inner diameter of the shaft portion of the intake / exhaust valve and having a melting point higher than that of the umbrella-forming core. A step of inserting into the sixth intermediate, and press molding using a mold for molding the shaft intermediate, which is an intermediate between the umbrella and the shaft, the umbrella forming core and the first A step of forming a seventh intermediate body composed of the umbrella part and the shaft intermediate body by applying to the sixth intermediate body into which a biaxial core for molding is inserted; The procedure for pulling out the biaxial molding core from the seventh intermediate, and heating the seventh intermediate to melt the umbrella molding core, A procedure for discharging from the seventh intermediate body, and a procedure for forming the shaft portion by closing the opening of the shaft portion intermediate body. It is characterized in that.

  The present invention also relates to a method of manufacturing an intake / exhaust valve composed of an umbrella member and a shaft member, in which an incompressible fluid is filled into a metal eighth intermediate body having a bottomed cylindrical shape. A procedure for sealing the incompressible fluid filled in the eighth intermediate by closing an opening portion of the eighth intermediate with a lid member, and a room temperature spinning process. A step of forming a ninth intermediate body, which is an intermediate body of the umbrella member, by applying the compressible fluid to the sealed eighth intermediate body; removing the lid member from the ninth intermediate body; A procedure for discharging the compressive fluid from the ninth intermediate body; a procedure for cutting the end of the ninth intermediate body to form the umbrella member; and the shaft member molded separately from the umbrella member. And a procedure for integrating the umbrella member.

  The present invention also relates to a method of manufacturing an intake / exhaust valve comprising an umbrella member and a shaft member, comprising a protrusion having an outer diameter equal to or greater than the inner diameter of the shaft member of the intake / exhaust valve, Procedure for inserting a spinning core for reducing the diameter of the opening end of the metal-made eighth intermediate body into the eighth intermediate body from the opening end of the eighth intermediate body And applying an ordinary temperature spinning process to the opening end of the eighth intermediate body into which the spinning core is inserted, thereby reducing the diameter of the opening end of the eighth intermediate body and the umbrella. A step of forming a tenth intermediate member that is an intermediate member, a step of extracting the spinning core from the tenth intermediate member, and a step of injecting an incompressible fluid into the tenth intermediate member And having the same outer diameter as the inner diameter of the shaft member of the intake / exhaust valve A procedure for sealing the incompressible fluid injected into the tenth intermediate body by inserting a mold-forming core into the opening of the tenth intermediate body, and a mold for molding the umbrella member A step of forming the umbrella member by pressing the tenth intermediate in which the incompressible fluid is sealed, and removing the mold-forming core from the umbrella member; A step of discharging the incompressible fluid from the umbrella member; and a step of integrating the shaft member formed separately from the umbrella member and the umbrella member.

  The present invention is also a method for manufacturing an intake / exhaust valve comprising an umbrella member and a shaft member, which is the same shape as the inner shape of the umbrella member and is more than a bottomed cylindrical metal eighth intermediate body. An umbrella member molding core made of a material having a low melting point, and an outer diameter that is the same as the inner diameter of the shaft member of the intake / exhaust valve, and a material having a higher melting point than the umbrella member molding core. Inserting the third shaft portion forming core into the inside of the eighth intermediate body from the opening end of the eighth intermediate body, and performing room temperature spinning processing on the umbrella member forming core and the above A step of forming an eleventh intermediate body, which is an intermediate body of the umbrella member, by applying the third shaft core forming core to the eighth intermediate body inserted therein; A step of pulling the core out of the eleventh intermediate, and the umbrella portion by heating the eleventh intermediate A procedure for melting the molding core and discharging the fluid of the core for molding the umbrella member from the eleventh intermediate body; a procedure for cutting the end of the eleventh intermediate body and molding the umbrella member; The shaft member formed separately from the umbrella member and the procedure for integrating the umbrella member are included.

  The present invention is also a method for manufacturing an intake / exhaust valve comprising an umbrella member and a shaft member, which is the same shape as the inner shape of the umbrella member and is more than a bottomed cylindrical metal eighth intermediate body. An opening end portion of the eighth intermediate member, which is composed of an umbrella member molding core made of a material having a low melting point and a protrusion having an outer diameter equal to or larger than the inner diameter of the shaft member of the intake / exhaust valve. A step of inserting a spinning core for reducing the diameter into the inside of the eighth intermediate from the opening end of the eighth intermediate, and a room-temperature spinning process with the core for forming an umbrella member An intermediate body of the umbrella member in which the opening end portion of the eighth intermediate body is reduced in diameter by applying to the opening end portion of the eighth intermediate body into which the spinning core is inserted. A procedure for forming a twelfth intermediate body, and the spinning core as the twelfth intermediate body; A fourth core forming core that is made of a material that has the same outer diameter as the inner diameter of the shaft member of the intake / exhaust valve and has a higher melting point than the core for molding the umbrella member Is inserted into the twelfth intermediate body, and press molding using a mold for molding the umbrella member is carried out with the core for molding the umbrella member and the core for molding the fourth shaft portion inside. A step of forming the umbrella member by applying to the inserted twelfth intermediate body, a step of pulling out the fourth shaft forming core from the umbrella member, and heating the umbrella member to Melting the member forming core, discharging the umbrella member forming core fluid from the umbrella member, the shaft member formed separately from the umbrella member, and the umbrella member And a uniting procedure.

  Further, in the method of manufacturing the intake and exhaust valves, including a procedure of closing the opening portion when an end portion of the shaft member opposite to the end portion integrated with the umbrella member has an opening portion, It is preferable.

  Further, in the above intake / exhaust valve manufacturing method, the outer shape is formed of a metal having an opening along the bottomed inner wall surface of the first intermediate body and having a higher thermal conductivity than the first intermediate body. It is preferable that the method includes a step of inserting the cup into the first intermediate body from the opening end of the first intermediate body and bringing the cup into close contact with the inner wall surface of the first intermediate body.

  Further, in the above intake / exhaust valve manufacturing method, the outer shape is made of a metal having an opening along the bottomed inner wall surface of the eighth intermediate body and having a higher thermal conductivity than the eighth intermediate body. Preferably, the method includes a step of inserting the cup into the eighth intermediate body from the opening end of the eighth intermediate body and closely contacting the inner wall surface of the eighth intermediate body.

  In the present invention, for example, extrusion molding by hot isostatic pressing is performed on the first intermediate, or the second intermediate, the third intermediate, the fourth intermediate, the fifth intermediate, the sixth intermediate, and the seventh intermediate. The intake / exhaust valve can be manufactured without applying to the eighth intermediate body, the ninth intermediate body, the tenth intermediate body, the eleventh intermediate body, and the twelfth intermediate body. For this reason, the taper part required in the pre-process of extrusion molding is shape | molded, for example in edge parts, such as a 1st intermediate body, a 3rd intermediate body, a 6th intermediate body, an 8th intermediate body, and a 10th intermediate body. It becomes unnecessary. In the present invention, for example, hot working such as hot isostatic pressing is performed on the first intermediate, the third intermediate, the sixth intermediate, the eighth intermediate, the tenth intermediate, and the like. Intake and exhaust valves can be molded at room temperature without any problems. For this reason, it becomes unnecessary to preheat the 1st intermediate body, the 3rd intermediate body, the 6th intermediate body, the 8th intermediate body, the 10th intermediate body, etc., for example. Also, in the present invention, as described above, hot working is performed at normal temperature without being applied to the first intermediate body, the third intermediate body, the sixth intermediate body, the eighth intermediate body, the tenth intermediate body, etc. Since the valve can be molded, for example, oxide scale or the like does not occur on the surfaces of the first intermediate body, the third intermediate body, the sixth intermediate body, the eighth intermediate body, the tenth intermediate body, and the like. For this reason, the finishing process for removing an oxide scale etc. becomes unnecessary. For the reasons described above, the manufacturing process can be simplified. As a result, the processing speed required for forming the intake / exhaust valve can be improved. Therefore, it is possible to reduce the time cost required for forming the intake / exhaust valve and the manufacturing cost of the intake / exhaust valve.

  Further, in the present invention, since hydrostatic pressing is not performed on the first intermediate or the like at room temperature, it is not necessary to apply a high water pressure to the first intermediate or the like. For this reason, for example, a device for generating a high water pressure becomes unnecessary.

  Further, in the present invention, as described above, hot working is not performed on, for example, the first intermediate body, the third intermediate body, the sixth intermediate body, the eighth intermediate body, the tenth intermediate body, etc. 1 intermediate body, 3rd intermediate body, 6th intermediate body, 8th intermediate body, 10th intermediate body, etc. do not produce a dimensional change accompanying heating and cooling. For this reason, these 1st intermediate body, 3rd intermediate body, 6th intermediate body, 8th intermediate body, 10th intermediate body etc. do not produce distortion by the dimensional change accompanying a heating and cooling. As a result, the first intermediate body, the third intermediate body, the sixth intermediate body, the eighth intermediate body, the tenth intermediate body, and the like do not generate residual stress due to the above-described distortion. Therefore, it is possible to prevent a dimensional change from occurring in the intake / exhaust valve.

  As described above, the method for manufacturing the intake / exhaust valve according to the present invention has been described. However, the bottom portions of the first intermediate body and the eighth intermediate body are thick (see the arrow X portion in FIGS. 2 to 6 and 8 to 12). It is preferable that By thickening the bottom of the first intermediate body or the eighth intermediate body, the umbrella part or umbrella member of the manufactured intake / exhaust valve is also thickened. For this reason, when the intake / exhaust valve manufactured by this manufacturing method is supported by the cylinder head of the internal combustion engine, the durability of the intake / exhaust valve with respect to the heat and gas pressure of the combustion chamber can be improved.

  Embodiments of a method for manufacturing an intake / exhaust valve according to the present invention will be described below in detail with reference to the drawings. In addition, this invention is not limited by each following embodiment.

[Embodiment 1]
Below, the outline of the manufacturing method of the intake / exhaust valve 10 which concerns on this invention is demonstrated based on drawing.

  FIG. 1 is a cross-sectional view schematically showing an example of the intake / exhaust valve 10. The intake / exhaust valve 10 includes an umbrella portion 12 and a shaft portion 14. The intake / exhaust valve 10 is hollow, and as a result, the intake / exhaust valve 10 is lighter than a solid intake / exhaust valve. The intake / exhaust valve 10 is made of metal.

  The umbrella part 12 is for opening or closing the gas hole of the combustion chamber of the internal combustion engine. The umbrella portion 12 is hollow, and a peripheral portion around the axis is formed in a funnel shape. Of the end portions along the axial direction of the umbrella portion 12, the end portion having a large diameter is closed. On the other hand, of the end portions along the axial direction of the umbrella portion 12, the end portion having a small diameter is opened, and the end portion having a small diameter is integrated with the open end portion of the shaft portion 14. Yes.

  The shaft portion 14 is for supporting the intake / exhaust valve 10 on the cylinder head of the internal combustion engine. The axial part 14 is formed in the cylindrical body by which the base end part was made into the bottom. The shaft portion 14 is supported by the cylinder head so as to be slidable along its own axial direction. Therefore, when the shaft portion 14 is supported by the cylinder head and moves along the axial direction, in other words, when the intake / exhaust valve 10 slides the cylinder head along the axial direction, as described above, the umbrella The part 12 opens or closes the gas hole in the combustion chamber of the internal combustion engine.

  Next, a method for manufacturing the intake / exhaust valve 10 according to Embodiment 1 of the present invention will be described.

  FIG. 2 is a sectional view showing a manufacturing procedure of the intake / exhaust valve 10 according to Embodiment 1 of the present invention.

  First, as shown in FIG. 2A, the incompressible fluid 16 is filled into a metal first intermediate body 10A having a bottomed cylindrical shape.

  Next, the incompressible fluid 16 filled in the first intermediate body 10A is sealed by closing the opening 18 of the first intermediate body 10A with the lid member 20.

  In other words, the inside of the first intermediate body 10A is filled with the incompressible fluid 16, and the opening portion 18 of the first intermediate body 10A is closed with the lid member 20, so that the incompressible fluid 16 becomes the first intermediate body 10A. Encapsulate.

  Next, as also shown in FIGS. 2B and 2C, room temperature spinning is performed on the first intermediate body 10 </ b> A in which the incompressible fluid 16 is sealed, and the umbrella portion 12 and the shaft portion 14. The second intermediate body 10B composed of the shaft intermediate body 14A, which is an intermediate body of the above, is formed. Specifically, the first intermediate body 10A in which the incompressible fluid 16 is sealed is rotated around the axis of the first intermediate body 10A, and this load is applied while applying a load to the side surface of the first intermediate body 10A. The position is changed along the axial direction of the first intermediate 10A. By applying such room temperature spinning processing to the first intermediate body 10A, the portion where the inner diameter gradually decreases along the axial direction is used as the umbrella portion 12, and the inner diameter is constant along the axial direction. The portion is referred to as a shaft intermediate body 14A. In other words, room temperature spinning is performed on the first intermediate body 10A, and the side having the larger inner diameter is used as the umbrella part 12, and the part having the constant inner diameter is used as the shaft part intermediate body 14A.

  Next, the lid member 20 is removed from the second intermediate 10B, and the incompressible fluid 16 is discharged from the second intermediate 10B. In other words, the lid member 20 is removed from the second intermediate body 10B, and the incompressible fluid 16 is removed from the inside of the second intermediate body 10B.

  Next, the end 24 of the shaft intermediate body 14A is cut (for the cutting position, refer to the position indicated by the arrow A in FIG. 2C). Specifically, the end 24 on the opposite side of the umbrella 12 of the second intermediate 10B from the portion that was the bottom 22 of the first intermediate 10A is removed from the second intermediate 10B.

  Next, the shaft portion 14 is formed by closing the opening of the shaft portion intermediate body 14A (see FIG. 1 for the shaft portion 14). Specifically, the open end portion of the shaft portion intermediate body 14A formed by removing the end portion 24 opposite to the umbrella portion 12 from the second intermediate body 10B is closed by welding or joining. In this manner, the shaft portion 14 is formed by closing the open end portion of the shaft portion intermediate body 14A.

  As described above, according to the method of manufacturing the intake / exhaust valve 10 of the present embodiment, the room temperature spinning process is performed in a state where the incompressible fluid 16 is sealed by the lid member 20 inside the first intermediate body 10A. As a result, the umbrella portion 12 and the shaft portion 14 (shaft portion intermediate body 14A) are formed. For this reason, the volume of the location which becomes the hollow part of the umbrella part 12 and the axial part 14 (axial part intermediate body 14A) can be ensured by the part of the volume of the incompressible fluid 16 with which the inside of the 1st intermediate body 10A was filled. . More specifically, since the incompressible fluid 16 is sealed in the first intermediate body 10A, the volume of the hollow portion of the first intermediate body 10A is not compressed even if a load is applied to the side surface of the first intermediate body 10A. Only the volume of the sex fluid 16 can be secured. Therefore, the volume of the hollow part of the umbrella part 12 and the axial part 14 (axial part intermediate body 14A) can be made constant, suppressing the dispersion | variation between products. Further, in the manufacturing method of the intake / exhaust valve 10, the umbrella portion 12 and the shaft portion 14 are formed because the umbrella portion 12 and the shaft portion 14 (shaft portion intermediate body 14 </ b> A) are formed by subjecting the first intermediate body 10 </ b> A to normal temperature spinning. (Shaft intermediate body 14A) can be molded at room temperature. For this reason, for example, it is not necessary to preheat the first intermediate body 10A in order to form the umbrella part 12 and the shaft part 14 (shaft part intermediate body 14A). Therefore, the manufacturing process can be simplified.

  As described above, the manufacturing method of the intake / exhaust valve 10 does not require the troublesome processing of forming the umbrella portion by hot processing as in the prior art, and only the above-described room temperature spinning processing, in other words, the umbrella at room temperature. Both the part 12 and the shaft part 14 (shaft part intermediate body 14A) can be molded.

[Embodiment 2]
Next, a method for manufacturing the intake / exhaust valve 10 according to Embodiment 2 of the present invention will be described. Note that the intake / exhaust valve 10 according to Embodiment 2 of the present invention is the same as that of Embodiment 1 described above, and a description thereof will be omitted. The method for manufacturing the intake / exhaust valve 10 according to the present embodiment uses a mold 40 including an upper mold 42 and a lower mold 44 with the incompressible fluid 16 sealed in the first intermediate 10A. The umbrella part 12 and the shaft part 14 (shaft part intermediate body 14A) are molded.

  FIG. 3 is a sectional view showing a manufacturing procedure of the intake / exhaust valve 10 according to Embodiment 2 of the present invention.

  First, as shown in FIGS. 3A and 3B, a metal material 32 is deep-drawn by using a mold 30 composed of an upper mold 26 and a lower mold 28, in other words, 10 A of 1st intermediate bodies which are bottomed cylindrical bodies are shape | molded by performing press molding.

  Next, as shown in FIG. 3C, the spinning core 36 for reducing the diameter of the opening end 34 of the first intermediate body 10A made of metal having a bottomed cylindrical shape is The intermediate body 10A is inserted into the first intermediate body 10A from the open end 34 thereof. The spinning core 36 used here is composed of a protruding portion 36A having an outer diameter equal to or larger than the inner diameter of the shaft portion 14 of the intake / exhaust valve 10. Specifically, the protrusion 36A of the spinning core 36 is inserted into the first intermediate body 10A from the opening end 34 of the first intermediate body 10A.

  Next, room temperature spinning is performed on the opening end 34 of the first intermediate 10A in which the spinning core 36 is inserted, whereby the opening end 34 of the first intermediate 10A is reduced in diameter and A third intermediate 10C having an umbrella intermediate 12A that is an intermediate of the umbrella 12 is molded. Specifically, the opening end of the first intermediate body 10A is rotated while rotating the first intermediate body 10A in which the protruding portion 36A of the spinning core 36 is inserted around the axis of the first intermediate body 10A. The position where this load is applied is changed along the axial direction of the first intermediate body 10A while applying a load to the side surface near the portion 34. By applying such room temperature spinning to the first intermediate 10A, the diameter of the first intermediate 10A in the vicinity of the opening end 34 is reduced to form the third intermediate 10C.

  Here, since the protrusion 36A of the spinning core 36 is inserted into the first intermediate body 10A, the spinning process can be performed even if a load is applied to the side surface near the opening end 34 of the first intermediate body 10A. The protrusion 36A of the working core 36 supports the first intermediate body 10A from the inside thereof. As a result, the vicinity of the opening end 34 of the third intermediate body 10C is set to the outer diameter of the protrusion 36A of the spinning core 36. Can be transformed to the same dimensions.

  Next, the protruding portion 36A of the spinning core 36 is extracted from the third intermediate 10C. In other words, the spinning core 36 is removed from the third intermediate body 10C.

  Next, as shown in FIG. 3D, the incompressible fluid 16 is injected into the third intermediate body 10C.

  Next, the incompressible fluid 16 injected into the third intermediate body 10C is sealed by inserting the mold forming core 38 into the opening 39 of the third intermediate body 10C. The mold forming core 38 used here includes an insertion shaft portion 38A having the same outer diameter as the inner diameter of the shaft portion 14 of the intake / exhaust valve 10, and this insertion shaft portion 38A is the third intermediate body 10C. Inserted into the opening 39.

  In other words, the interior of the third intermediate body 10C is filled with the incompressible fluid 16, and the incompressible fluid 16 is enclosed in the third intermediate body 10C by closing the third intermediate body 10C with the mold forming core 38. To do.

  Next, as shown in FIGS. 3E to 3G, press molding using a mold 40 for molding the shaft intermediate body 14A, which is an intermediate body between the umbrella portion 12 and the shaft portion 14, The incompressible fluid 16 is applied to the sealed third intermediate body 10C to form a fourth intermediate body 10D composed of the umbrella part 12 and the shaft part intermediate body 14A. The mold 40 used here includes an upper mold 42 and a lower mold 44. Here, deep drawing is applied to the third intermediate 10C. Specifically, the third intermediate body 10C in which the incompressible fluid 16 is sealed is placed in a mold 40 composed of an upper mold 42 and a lower mold 44, and the load is transferred to the third intermediate body by the mold 40. 10C is added from the outside of the third intermediate 10C. By performing such deep drawing on the third intermediate body 10C, the umbrella part 12 and the shaft part intermediate body 14A are formed.

  Next, the mold forming core 38 is removed from the fourth intermediate 10D, and the incompressible fluid 16 is discharged from the fourth intermediate 10D. Specifically, the insertion shaft portion 38A of the mold forming core 38 is pulled out from the fourth intermediate body 10D, and the incompressible fluid 16 is discharged from the fourth intermediate body 10D.

  Next, the shaft portion 14 is formed by closing the opening of the shaft portion intermediate body 14A. This is the same as in the first embodiment.

  As described above, according to the method for manufacturing the intake / exhaust valve 10 of the present embodiment, the incompressible fluid 16 is sealed inside the third intermediate body 10C by the mold forming core 38. The umbrella portion 12 and the shaft portion 14 (shaft portion intermediate body 14A) are formed by press molding using a mold 40 composed of the upper die 42 and the lower die 44. For this reason, at least the volume of the portion that becomes the hollow portion of the umbrella portion 12 can be ensured by the volume of the incompressible fluid 16 filled in the inside of the third intermediate body 10C. Accordingly, at least the volume of the hollow portion of the umbrella portion 12 can be made constant while suppressing variations between products. In addition, the manufacturing method of the present intake / exhaust valve 10 is that the room temperature spinning process is performed on the first intermediate body 10A and the press molding using the mold 40 composed of the upper mold 42 and the lower mold 44 is performed at the third intermediate temperature. Since the umbrella portion 12 and the shaft portion 14 (shaft portion intermediate body 14A) are formed on the body 10C, the umbrella portion 12 and the shaft portion 14 (shaft portion intermediate body 14A) can be formed at room temperature. Therefore, for example, it is not necessary to preheat the first intermediate body 10A and the third intermediate body 10C in order to form the umbrella part 12 and the shaft part 14 (shaft part intermediate body 14A). Therefore, the manufacturing process can be simplified.

  In this way, the complicated process of forming the umbrella part by hot working as in the past is not necessary, and only by the above-mentioned room temperature spinning process and press forming (deep drawing process) using the mold 40 at room temperature. In other words, both the umbrella part 12 and the shaft part 14 (shaft intermediate body 14A) can be molded at room temperature.

  By the way, the material 32 used for such an intake / exhaust valve 10 is cold-worked when the above-described room temperature spinning process and press molding (deep drawing process) using the mold 40 at room temperature are performed. Therefore, the processing speed when processing the intake / exhaust valve 10 can be improved, and a large processing machine for performing the hot processing which has been conventionally required becomes unnecessary.

[Embodiment 3]
Next, a method for manufacturing the intake / exhaust valve 10 according to Embodiment 3 of the present invention will be described. In addition, the intake / exhaust valve 10 according to Embodiment 3 of the present invention has a high heat transfer rate that has a higher thermal conductivity than the first intermediate body 10A in the inner diameter portion of the intake / exhaust valve 10 described in Embodiment 2 above. It is covered with a cup 46 of material (not shown). Since the other points of the intake / exhaust valve 10 according to the third embodiment of the present invention are the same as those of the first and second embodiments, the description thereof is omitted.

  The method of manufacturing the intake / exhaust valve 10 according to the present embodiment is the same as the method of manufacturing the intake / exhaust valve 10 described in the above-described second embodiment, except that the cup 46 of the above-described bottomed tubular high heat transfer material is used as the first. After placing the intermediate body 10A in close contact with the inner wall surface, the procedure moves to the procedure for performing the above-mentioned room temperature spinning process.

  FIG. 4 is a sectional view showing a manufacturing procedure of the intake / exhaust valve 10 according to the third embodiment of the present invention.

  First, as shown in FIGS. 4A and 4B, a metal material 32 is deep-drawn using a die 30 composed of an upper die 26 and a lower die 28. The first intermediate body 10A that is a bottomed cylindrical body is molded. This is the same as in the second embodiment described above.

  Next, as shown in FIG. 4C, a cup 46 whose outer shape opens in a shape along the bottomed inner wall surface of the first intermediate body 10A is connected to the open end of the first intermediate body 10A. It inserts into the inside of 10A of 1st intermediate bodies from 34, and is made to contact | adhere to the inner wall face of 10 A of 1st intermediate bodies. The cup 46 used here is made of a metal having higher thermal conductivity than the first intermediate 10A. In other words, the cup 46 of the high heat transfer material that is opened in a shape along the inner wall surface of the first intermediate body 10A and that can be deformed by the deformation of the first intermediate body 10A is used as the first intermediate body. Adhere to the inner wall surface of 10A.

  Next, as shown in FIG. 4D, the spinning core 36 for reducing the diameter of the opening end 34 of the first intermediate body 10A made of metal having a bottomed cylindrical shape is The intermediate body 10A is inserted into the first intermediate body 10A from the open end 34 thereof. This is the same as in the second embodiment described above. More specifically, however, the protrusion 36A of the spinning core 36 is inserted into the cup 46 that is in close contact with the inner wall surface of the first intermediate 10A. Also, the spinning processing core 36 used here is composed of a protrusion 36A having an outer diameter equal to or larger than the inner diameter of the shaft portion 14 of the intake / exhaust valve 10, as in the second embodiment. is there.

  Next, room temperature spinning is performed on the opening end 34 of the first intermediate 10A in which the spinning core 36 is inserted, whereby the opening end 34 of the first intermediate 10A is reduced in diameter and A third intermediate 10C having an umbrella intermediate 12A that is an intermediate of the umbrella 12 is molded. This is also the same as in the second embodiment.

  Next, as shown in FIG. 4E, the protrusion 36A of the spinning core 36 is extracted from the third intermediate 10C, and the incompressible fluid 16 is injected into the third intermediate 10C. To do. This is also the same as in the second embodiment. More specifically, however, the incompressible fluid 16 is injected into the deformed body 46A of the cup 46 that is in close contact with the inner wall surface of the third intermediate 10C.

  Next, the incompressible fluid 16 injected into the third intermediate body 10C is sealed by inserting the mold forming core 38 into the opening 39 of the third intermediate body 10C. This is also the same as in the second embodiment. More specifically, however, the mold-forming core 38 is inserted into the deformed body 46A of the cup 46 that is in close contact with the inner wall surface of the third intermediate body 10C. The mold-forming core 38 used here includes an insertion shaft portion 38A having the same outer diameter as the inner diameter of the shaft portion 14 of the intake / exhaust valve 10, and this insertion shaft portion 38A is the third intermediate body. The point of insertion into the opening portion 39 of 10C is the same as in the second embodiment.

  Next, as shown in FIGS. 4F to 4H, press molding using a mold 40 for molding the shaft intermediate body 14A, which is an intermediate body between the umbrella portion 12 and the shaft portion 14, The incompressible fluid 16 is applied to the sealed third intermediate body 10C to form a fourth intermediate body 10D composed of the umbrella part 12 and the shaft part intermediate body 14A. This is also the same as in the second embodiment. Further, the mold 40 used here is the same as that of the above-described second embodiment also in that the upper mold 42 and the lower mold 44 are configured.

  Next, the molding core 38 is removed from the fourth intermediate body 10D, the incompressible fluid 16 is discharged from the fourth intermediate body 10D, the opening portion of the shaft intermediate body 14A is closed, and the shaft section 14 is closed. Mold. This is also the same as in the second embodiment.

  When the intake / exhaust valve 10 formed from the first intermediate body 10A by the method of manufacturing the intake / exhaust valve 10 is used while being supported by the cylinder head of the engine, the umbrella portion 12 of the intake / exhaust valve 10 is removed from the combustion chamber. The received heat is transferred from the metal constituting the first intermediate 10 </ b> A to the metal constituting the cup 46. Here, the metal constituting the cup 46 has higher thermal conductivity than the metal constituting the first intermediate 10A. For this reason, the heat transmitted to the metal constituting the cup 46 is easily transmitted to the shaft portion 14 side. Therefore, the efficiency of exhaust heat from the combustion chamber of the engine to the outside by the intake / exhaust valve 10 can be further improved.

  As described above, the complicated processing work of forming the umbrella portion by hot processing as in the prior art becomes unnecessary, and the above-described room temperature spinning processing and press forming (deep drawing processing) using the mold 40 at room temperature. In other words, in other words, both the umbrella part 12 and the shaft part 14 (shaft part intermediate body 14A) can be molded at room temperature.

  Further, as described above, by applying a load to the side surface of the first intermediate body 10A and the outer surface of the fourth intermediate body 10D, the high heat transfer material inside the first intermediate body 10A and the fourth intermediate body 10D Since the cup 46 is deformed together with the first intermediate body 10A and the fourth intermediate body 10D, the intake / exhaust valve 10 having a two-layer structure of the material of the first intermediate body 10A and the high heat transfer material of the cup 46 can be easily formed. .

  By the way, the material 32 used for such an intake / exhaust valve 10 is cold-worked when the above-described room temperature spinning process and press molding (deep drawing process) using the mold 40 at room temperature are performed. Therefore, the processing speed when processing the intake / exhaust valve 10 can be improved, and a large processing machine for performing the hot processing which has been conventionally required becomes unnecessary.

[Embodiment 4]
Next, a method for manufacturing the intake / exhaust valve 10 according to Embodiment 4 of the present invention will be described. Note that the intake / exhaust valve 10 according to Embodiment 4 of the present invention is the same as that of Embodiment 1 described above, and a description thereof will be omitted.

  The method of manufacturing the intake / exhaust valve 10 according to the present embodiment is the same as that of the method of manufacturing the intake / exhaust valve 10 described in the first embodiment when the room temperature spinning process is performed on the first intermediate 10A. The inside of the body 10A is supported by an umbrella-forming core 48 and a first shaft-forming core 50.

  FIG. 5 is a sectional view showing a manufacturing procedure of the intake / exhaust valve 10 according to Embodiment 4 of the present invention.

  First, as shown in FIG. 5A, the outer diameter is the same as the inner diameter of the umbrella portion forming core 48 that is the same shape as the inner shape of the umbrella portion 12 and the shaft portion 14 of the intake / exhaust valve 10. The first shaft portion forming core 50 is inserted into the first intermediate body 10A from the open end 34 of the first intermediate body 10A. The umbrella forming core 48 used here is made of a material having a melting point lower than that of the bottomed cylindrical metal first intermediate body 10A. The first shaft portion forming core 50 is made of a material having a higher melting point than the umbrella portion forming core 48.

  Here, the core part 48 for umbrella part shaping | molding respond | corresponds to the periphery around the axis | shaft of the umbrella part 12 of the intake / exhaust valve | bulb 10 being funnel-shaped as mentioned above. The umbrella forming core 48 has a frustoconical portion. From the upper base of the frustoconical portion, a cylinder having the same radius as the upper base has its central axis and the frustoconical portion. The center axis of each of them is aligned to extend somewhat. For this reason, the outer shape of the umbrella-forming core 48 is the same as the inner shape of the funnel-shaped umbrella portion 12 around the axis. The outer diameter of the cylindrical portion of the umbrella forming core 48 is the same as the outer diameter of the first shaft forming core 50.

  Such an umbrella-forming core 48 is arranged such that the bottom bottom of the truncated cone portion is in close contact with the bottom wall of the inner diameter portion of the first intermediate body 10A. At this time, the umbrella-forming core 48 and the first shaft-forming core 50 are arranged such that the central axes thereof coincide with the central axis of the first intermediate body 10A.

  Next, as shown in FIGS. 5B and 5C, the room temperature spinning process is performed in a state where the umbrella-forming core 48 and the first shaft-forming core 50 are inserted therein. The first intermediate 10A is applied to form a fifth intermediate 10E composed of the umbrella portion 12 and the shaft intermediate 14A.

  Specifically, the first intermediate body 10A in which the umbrella part forming core 48 and the first shaft part forming core 50 are inserted is rotated around the axis of the first intermediate body 10A while the first intermediate body 10A is rotated. While applying a load to the side surface of the body 10A, the position to apply this load is changed along the axial direction of the first intermediate body 10A. By applying such room temperature spinning processing to the first intermediate body 10A, the portion where the inner diameter gradually decreases along the axial direction is used as the umbrella portion 12, and the inner diameter is constant along the axial direction. The portion is referred to as a shaft intermediate body 14A. In other words, room temperature spinning is performed on the first intermediate body 10A, and the side having the larger inner diameter is used as the umbrella part 12, and the part having the constant inner diameter is used as the shaft part intermediate body 14A.

  Here, the umbrella-forming core 48 has a shape corresponding to the inside of the umbrella portion 12. For this reason, even when a load is applied to the side surface of the hollow first intermediate body 10A, the umbrella-forming core 48 supports the first intermediate body 10A from the inside, and as a result, the inside of the first intermediate body 10A The shape can be deformed according to the external shape of the core 48 for forming the umbrella part.

  Next, the first shaft forming core 50 is pulled out from the fifth intermediate 10E.

  Next, the fifth intermediate body 10E is heated to melt the umbrella part forming core 48, and the fluid of the umbrella part forming core 48 is discharged from the fifth intermediate body 10E.

  Next, the end portion 52 of the shaft portion intermediate body 14A is cut (for the cutting position, refer to the position indicated by the arrow B in FIG. 5C). Specifically, the end 52 on the side opposite to the umbrella 12 is removed from the fifth intermediate 10E. This is the same as in the first embodiment.

  Next, the shaft portion 14 is formed by closing the opening of the shaft portion intermediate body 14A. Specifically, the open end portion of the shaft portion intermediate body 14A formed by removing the end portion 52 opposite to the umbrella portion 12 from the fifth intermediate body 10E is closed by welding or joining. This is also the same as in the first embodiment.

  As described above, according to the method of manufacturing intake / exhaust valve 10 of the present embodiment, umbrella-forming core 48 and first shaft-forming core 50 are inserted into first intermediate body 10A. In this state, the umbrella portion 12 and the shaft portion 14 (shaft portion intermediate body 14A) are formed by normal temperature spinning. Therefore, the hollow parts of the umbrella part 12 and the shaft part 14 (shaft part intermediate body 14A) can be accurately molded in accordance with the shapes of the umbrella part forming core 48 and the first shaft part forming core 50. For this reason, the shape of the hollow part of the umbrella part 12 and the axial part 14 (axial part intermediate body 14A) can be made constant, suppressing the dispersion | variation between products. Further, in the manufacturing method of the intake / exhaust valve 10, the umbrella portion 12 and the shaft portion 14 are formed because the umbrella portion 12 and the shaft portion 14 (shaft portion intermediate body 14 </ b> A) are formed by subjecting the first intermediate body 10 </ b> A to normal temperature spinning. (Shaft intermediate body 14A) can be molded at room temperature. For this reason, for example, it is not necessary to preheat the first intermediate body 10A in order to form the umbrella part 12 and the shaft part 14 (shaft part intermediate body 14A). Therefore, the manufacturing process can be simplified. Further, after forming the umbrella part 12 and the shaft part intermediate body 14A, the first shaft part forming core 50 is pulled out of the fifth intermediate body 10E, and then the fifth intermediate body 10E is heated to form the umbrella part forming core 48. Is melted, the fluid of the umbrella forming core 48 can be discharged from the fifth intermediate body 10E. In this manner, the umbrella forming core 48 can be easily removed from the inside of the fifth intermediate body 10E.

  In addition, the complicated processing operation of forming the umbrella portion by hot working as in the prior art becomes unnecessary, and only the above-described room temperature spinning processing, in other words, the umbrella portion 12 and the shaft portion 14 (the shaft portion intermediate body 14A) at room temperature. ) And both.

  Further, as described above, both the umbrella portion 12 and the shaft portion intermediate body 14A of the fifth intermediate body 10E are formed using the umbrella portion forming core 48 and the first shaft portion forming core 50. The umbrella portion 12 can be easily molded, and the inner shape of the fifth intermediate 10E, in other words, the shape of the hollow portion of the fifth intermediate 10E is changed to the shape of the umbrella-forming core 48 and the first shaft portion. It can be accurately molded according to the external shape of the core 50.

  Further, as described above, since the umbrella part forming core 48 is made of a low melting point material, the umbrella part forming core 48 is heated by heating the fifth intermediate body 10E. The molding core 48 can be melted. Therefore, not only can the umbrella part forming core 48 be inserted into the first intermediate body 10A to form the umbrella part 12 of the fifth intermediate body 10E, but the umbrella part forming core 48 can be melted as described above. The fluid of the lever forming core 48 can be easily taken out of the fifth intermediate 10E.

[Embodiment 5]
Next, the manufacturing method of the intake / exhaust valve 10 of Embodiment 5 of this invention is demonstrated. The intake / exhaust valve 10 according to the fifth embodiment of the present invention is the same as that of the first, second, and fourth embodiments described above, and thus the description thereof is omitted.

  The method for manufacturing the intake / exhaust valve 10 according to the present embodiment is the same as the method for manufacturing the intake / exhaust valve 10 described in the second embodiment, except that press molding (deep drawing) using the mold 40 is performed in the sixth middle. When applied to the body 10F, the inside of the sixth intermediate body 10F is supported by the umbrella-forming core 48 and the insertion shaft portion 56A of the second shaft-forming core 56 described in the fourth embodiment. To do.

  FIG. 6 is a sectional view showing a manufacturing procedure of the intake / exhaust valve 10 according to the fifth embodiment of the present invention.

  First, as shown in FIGS. 6A and 6B, a metal material 32 is deep-drawn using a mold 30 composed of an upper mold 26 and a lower mold 28, in other words, 10 A of 1st intermediate bodies which are bottomed cylindrical bodies are shape | molded by performing press molding. This is the same as in the second embodiment described above.

  Next, as shown in FIG. 6C, in order to reduce the diameter of the umbrella-forming core 48 and the opening end 34 of the first intermediate body 10A, which are the same shape as the internal shape of the umbrella 12. The spinning core 54 is inserted into the first intermediate body 10A from the open end 34 of the first intermediate body 10A. The umbrella forming core 48 used at this time is made of a material having a melting point lower than that of the bottomed cylindrical metal first intermediate body 10A as described in the fourth embodiment. The spinning core 54 includes a protrusion 54 </ b> A having an outer diameter equal to or larger than the inner diameter of the shaft portion 14 of the intake / exhaust valve 10.

  Specifically, the core 48 for forming the umbrella part is arranged so that the lower bottom of the truncated cone portion is in close contact with the bottom wall of the inner diameter part of the first intermediate body 10A. This is the same as in the fourth embodiment described above. At this time, the umbrella forming core 48 and the spinning core 54 are arranged such that the central axes thereof coincide with the central axis of the first intermediate body 10A.

  Next, room temperature spinning is performed on the opening end 34 of the first intermediate 10A in which the umbrella forming core 48 and the spinning core 54 are inserted, whereby the first intermediate 10A The sixth intermediate body 10 </ b> F having the umbrella end intermediate body 12 </ b> A that is an intermediate body of the umbrella section 12 is formed with the opening end portion 34 having a reduced diameter. Specifically, while rotating the first intermediate body 10A in which the projections 54A of the umbrella forming core 48 and the spinning processing core 54 are inserted around the axis of the first intermediate body 10A, the first intermediate body 10A is rotated. While applying a load to the side surface in the vicinity of the opening end 34 of the body 10A, the position to apply this load is changed along the axial direction of the first intermediate body 10A. By subjecting the first intermediate body 10A to such a room temperature spinning process, the diameter of the first intermediate body 10A in the vicinity of the opening end 34 is reduced to form the sixth intermediate body 10F.

  Here, the umbrella-forming core 48 has a shape corresponding to the inside of the umbrella portion 12. For this reason, even if a load is applied to the sixth intermediate body 10F from the outside, the umbrella forming core 48 supports the sixth intermediate body 10F from the inside, and as a result, the internal shape of the sixth intermediate body 10F. Can be deformed in accordance with the external shape of the umbrella forming core 48.

  Next, the spinning core 54 is pulled out from the sixth intermediate 10F.

  Next, the second shaft portion forming core 56 is inserted into the sixth intermediate body 10F. At this time, the umbrella part forming core 48 and the second shaft part forming core 56 are arranged so that the center axes thereof coincide with the center axis of the sixth intermediate body 10F. The second shaft portion molding core 56 used here includes an insertion shaft portion 56A having the same outer diameter as the inner diameter of the shaft portion 14 of the intake / exhaust valve 10, and this insertion shaft portion 56A is the sixth intermediate body. It is inserted into the opening 58 of 10F. The second shaft portion forming core 56 is made of a material having a melting point higher than that of the umbrella portion forming core 48.

  Next, as shown in (D) to (F) of FIG. 6, press molding using a mold 40 for molding the shaft portion intermediate body 14 </ b> A that is an intermediate body of the umbrella portion 12 and the shaft portion 14 is performed. An umbrella portion forming core 48 and a second shaft portion forming core 56 are applied to the sixth intermediate body 10F inserted therein to form a seventh portion configured of the umbrella portion 12 and the shaft portion intermediate body 14A. Intermediate 10G is formed.

  Next, the second shaft portion molding core 56 is pulled out from the seventh intermediate body 10G.

  Next, the umbrella intermediate core 48 is melted by heating the seventh intermediate 10G, and the fluid of the umbrella intermediate core 48 is discharged from the seventh intermediate 10G.

  Next, the shaft portion 14 is formed by closing the opening of the shaft portion intermediate body 14A. Specifically, the open end of the shaft intermediate body 14A opposite to the umbrella portion 12 is closed by welding or joining. This is the same as in the first embodiment.

  As described above, according to the method of manufacturing the intake / exhaust valve 10 of the present embodiment, the umbrella forming core 48 and the second shaft forming core 56 are inserted into the sixth intermediate body 10F. In this state, the umbrella portion 12 and the shaft portion 14 (shaft portion intermediate body 14 </ b> A) are formed by press molding using the mold 40 constituted by the upper die 42 and the lower die 44. Therefore, the hollow portions of the umbrella part 12 and the shaft part 14 (shaft part intermediate body 14A) can be accurately molded in accordance with the shapes of the umbrella part forming core 48 and the second shaft part forming core 56. For this reason, the shape of the hollow part of the umbrella part 12 and the axial part 14 (axial part intermediate body 14A) can be made constant, suppressing the dispersion | variation between products. In addition, the manufacturing method of the intake / exhaust valve 10 is such that normal temperature spinning is applied to the first intermediate body 10A and press molding using a mold 40 composed of an upper die 42 and a lower die 44 is performed at the sixth intermediate temperature. Since the umbrella part 12 and the shaft part 14 (shaft part intermediate body 14A) are formed on the body 10F, the umbrella part 12 and the shaft part 14 (shaft part intermediate body 14A) can be molded at room temperature. Therefore, for example, it is not necessary to preheat the first intermediate body 10A and the sixth intermediate body 10F in order to form the umbrella part 12 and the shaft part 14 (shaft part intermediate body 14A). Therefore, the manufacturing process can be simplified. In addition, after forming the umbrella part 12 and the shaft intermediate body 14A, the second shaft forming core 56 is pulled out from the seventh intermediate body 10G, and then the seventh intermediate body 10G is heated to form the umbrella part forming core 48. Is melted, the fluid of the umbrella forming core 48 can be discharged from the seventh intermediate 10G. In this manner, the umbrella forming core 48 can be easily removed from the inside of the seventh intermediate body 10G.

  Moreover, the complicated processing operation of forming the umbrella portion by hot processing as in the prior art becomes unnecessary, and in other words, only the above-described room temperature spinning processing and press forming (deep drawing processing) using the mold 40 at room temperature. For example, both the umbrella part 12 and the shaft part 14 (shaft part intermediate body 14A) can be molded at room temperature.

  Further, as described above, the umbrella portion 12 and the shaft portion 14 (shaft portion intermediate body 14A) of the sixth intermediate body 10F are used by using the umbrella portion forming core 48 and the second shaft portion forming core 56. Since both are molded, the umbrella portion 12 can be easily molded, and the shape of the inside of the sixth intermediate body 10F, in other words, the shape of the hollow portion of the sixth intermediate body 10F is changed to the umbrella portion forming core 48 and the It can be accurately molded according to the external shape of the biaxial portion molding core 56.

  Further, as described above, since the umbrella-forming core 48 is made of a low-melting-point material, heat is transmitted to the umbrella-forming core 48 by heating the seventh intermediate 10G, so that the umbrella portion The molding core 48 can be melted. Therefore, not only can the umbrella-forming core 48 be inserted into the sixth intermediate body 10F to mold the umbrella section 12 of the seventh intermediate 10G, but the umbrella-forming core 48 can be melted as described above. Accordingly, the fluid of the umbrella-forming core 48 can be easily taken out from the seventh intermediate body 10G.

  By the way, the material used for such an intake / exhaust valve 10 is cold-worked when subjected to the above-described room temperature spinning process and press forming (deep drawing process) using the mold 40 at room temperature. Therefore, the processing speed when processing the intake / exhaust valve 10 can be improved, and a large processing machine for performing the hot processing which has been conventionally required becomes unnecessary.

[Embodiment 6]
In the manufacturing method of the intake / exhaust valve 10 according to the first to fifth embodiments of the present invention described above, the umbrella portion 12 and the shaft portion 14 are formed from the first intermediate body 10A of one member. Not limited to. As shown in FIGS. 7A and 7B, the present invention forms an umbrella member 82 and a shaft member 84 using two members, and includes the umbrella member 82 and the shaft member 84. It is also possible to manufacture the intake / exhaust valve 80 to be manufactured. The intake / exhaust valve 80 is functionally the same as the intake / exhaust valve 10 described above.

  Hereinafter, a method for manufacturing the intake / exhaust valve 80 including the umbrella member 82 and the shaft member 84 will be described.

  In the method for manufacturing the intake / exhaust valve 80 according to the sixth embodiment of the present invention, the umbrella member 82 is formed in the same manner as the manufacturing method according to the first embodiment described above.

  FIG. 8 is a sectional view showing a manufacturing procedure of the intake / exhaust valve 80 according to Embodiment 6 of the present invention.

  First, as shown in FIG. 8A, an incompressible fluid 86 is filled into a metal-made eighth intermediate body 10H having a bottomed cylindrical shape.

  Next, the incompressible fluid 86 filled in the eighth intermediate body 10H is sealed by closing the opening portion 88 of the eighth intermediate body 10H with the lid member 90.

  Next, as shown in FIGS. 8B and 8C, room temperature spinning is applied to the eighth intermediate body 10H in which the incompressible fluid 86 is sealed, and the intermediate body of the umbrella member 82 is used. A certain ninth intermediate 10I is formed. Specifically, the eighth intermediate body 10H in which the incompressible fluid 86 is sealed is rotated about the axis of the eighth intermediate body 10H, and this load is applied while applying a load to the side surface of the eighth intermediate body 10H. The position is changed along the axial direction of the eighth intermediate body 10H.

  Next, the lid member 90 is removed from the ninth intermediate body 10I, and the incompressible fluid 86 is discharged from the ninth intermediate body 10I.

  Next, the end portion 92 of the ninth intermediate body 10I is cut to form the umbrella member 82 (for the cutting position, see the position indicated by the arrow C in FIG. 8C). Specifically, the end 92 on the opposite side of the ninth intermediate 10I from the portion that was the bottom 94 of the eighth intermediate 10H is removed from the ninth intermediate 10I. More specifically, the above-described room temperature spinning process is applied to the eighth intermediate body 10H, and a portion where the inner diameter gradually decreases along the axial direction is referred to as an umbrella member 82.

  Each procedure described above is the same as that in the first embodiment except that the member to be molded is the umbrella member 82.

  Next, as shown in FIGS. 7A and 7B, the shaft member 84 formed separately from the umbrella member 82 and the umbrella member 82 are integrated by welding or joining. Here, for example, when a pipe member is used as the shaft member 84, the tip end portion 84A of the pipe member 84 is made smaller in diameter than other portions excluding the tip end portion 84A and the above-described umbrella member 82 is opened. It can be inserted into the end 83. Further, when the umbrella member 82 and the shaft member 84 are integrated, the end portion 83A of the umbrella member 82 and the shaft are inserted with the distal end portion 84A of the shaft member 84 inserted into the end portion 83 of the umbrella member 82. The tip member 84A of the member 84 is welded, for example, so that the umbrella member 82 and the shaft member 84 are joined together. Here, the distal end portion 84A of the pipe member 84 is reduced in diameter than the other portions, but the present invention is not limited to this. The present invention is not limited as long as the distal end portion 84 </ b> A of the pipe member 84 can be inserted into the umbrella member 82. Therefore, the distal end portion 84A of the pipe member 84 may have, for example, the same diameter as the other portions excluding the distal end portion 84A as long as the condition that the distal end portion 84A can be inserted into the umbrella member 82 is satisfied.

  By the way, when the base end portion 84B which is the end portion on the opposite side to the tip end portion 84A which is an end portion integrated with the umbrella member 82 of the shaft member 84 has an opening portion, for example, as described above, the umbrella member 82 and the shaft member 84 are integrated, and then the opening portion of the base end portion 84B is closed.

  The intake / exhaust valve 80 can be manufactured as described above.

  Note that the order of integrating the umbrella member 82 and the shaft member 84 and the procedure of closing the opening of the base end portion 84B of the shaft member 84 may be reversed.

  As described above, according to the method of manufacturing the intake / exhaust valve 80 of the present embodiment, the room temperature spinning process is performed in a state where the incompressible fluid 86 is sealed by the lid member 90 inside the eighth intermediate 10H. Thereby, the umbrella member 82 (9th intermediate body 10I) is shape | molded. For this reason, the volume of the location which becomes the hollow part of the umbrella member 82 (9th intermediate body 10I) is securable by the part of the volume of the incompressible fluid 86 with which the inside of the 8th intermediate body 10H was filled. Therefore, the volume of the hollow portion of the umbrella member 82 (the ninth intermediate body 10I) can be made constant while suppressing variations between products. Further, in the manufacturing method of the intake / exhaust valve 80, the umbrella member 82 (the ninth intermediate 10I) is formed by performing the room temperature spinning process on the eighth intermediate 10H to form the umbrella member 82 (the ninth intermediate 10I). Molding can be done at room temperature. For this reason, for example, it is not necessary to preheat the eighth intermediate body 10H in order to form the umbrella member 82 (the ninth intermediate body 10I). Therefore, the manufacturing process can be simplified. Further, according to the method of manufacturing the intake / exhaust valve 80, the shaft member 84 formed separately from the umbrella member 82 is used, and therefore, for example, a cylindrical member can be applied as the shaft member 84. For this reason, the special operation | work for shape | molding the shaft member 84 becomes unnecessary. Therefore, the manufacturing process can be simplified also in this respect.

  Further, for example, when a pipe material that is a cylindrical member is applied as the shaft member 84, the opening of the base end portion 84 </ b> B that is the end portion on the opposite side of the end portion integrated with the umbrella member 82 of the shaft member 84. The portion may be closed after the umbrella member 82 and the shaft member 84 are integrated, and after the opening portion of the base end portion 84B of the shaft member 84 is closed, the umbrella member 82 and the shaft member 84 are integrated. May be used. In this manner, the timing for closing the opening portion of the shaft member 84 can be freely set before and after the timing at which the umbrella member 82 and the shaft member 84 are integrated. For this reason, a degree of freedom can be given to the manufacturing procedure of the intake / exhaust valve 80.

  In this way, the manufacturing method of the intake / exhaust valve 80 does not require the complicated processing work of forming the umbrella member by hot processing as in the prior art, and only the above-described room temperature spinning process, in other words, the umbrella at room temperature. The member 82 (9th intermediate body 10I) can be shape | molded.

  Moreover, since the umbrella member 82 and the shaft member 84 are joined together by welding or joining as described above, the umbrella member 82 and the shaft member 84 can be easily integrated.

  Further, in the method of manufacturing the intake / exhaust valve 80 of the present embodiment, the intake / exhaust valve 80 includes, for example, an umbrella member 82 formed of a material having high heat resistance, and a shaft member 84 formed of a lighter material than before. Can be configured. This makes it possible to further reduce the weight of the intake / exhaust valve 80 as compared to an intake / exhaust valve in which the umbrella portion and the shaft portion are simply formed of the same material and are hollow.

  Further, when the intake / exhaust valve 80 manufactured by the method for manufacturing the intake / exhaust valve 80 is supported by the cylinder head of the internal combustion engine, the umbrella has a relatively low strength compared to the umbrella member 82 and the shaft member 84. Since the welded portion or the joint portion between the member 82 and the shaft member 84 is not exposed to the combustion chamber, the intake / exhaust valve 80 is stronger than the strength of the intake / exhaust valve 10 in which the umbrella portion 12 and the shaft portion 14 are integrally formed. The rate at which the overall strength is reduced can be reduced as compared with an intake / exhaust valve in which the welded or joined portion between the umbrella member 82 and the shaft member 84 is exposed to the combustion chamber.

[Embodiment 7]
Next, a method for manufacturing the intake / exhaust valve 80 according to Embodiment 7 of the present invention will be described. In the method of manufacturing the intake / exhaust valve 80 according to Embodiment 7 of the present invention, the umbrella member 82 is formed in the same manner as in the method of manufacturing of Embodiment 2 described above. Unless otherwise specified, the same components as those in the above-described sixth embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  FIG. 9 is a sectional view showing a manufacturing procedure of the intake / exhaust valve 80 according to Embodiment 7 of the present invention.

  First, as shown in FIGS. 9A and 9B, a metal material 102 is deep-drawn by using a mold 100 composed of an upper mold 96 and a lower mold 98, in other words, By performing press molding, the eighth intermediate body 10H which is a bottomed cylindrical body is molded.

  Next, as shown in FIG. 9C, a spinning core 106 for reducing the diameter of the opening end 104 of the metal-made eighth intermediate 10H having a bottomed cylindrical shape is It inserts into the inside of the 8th intermediate body 10H from the opening edge part 104 of the intermediate body 10H. The spinning core 106 used here is composed of a protrusion 106A having an outer diameter equal to or larger than the inner diameter of the shaft member 84 of the intake / exhaust valve 80.

  Next, the room temperature spinning process is performed on the opening end part 104 of the eighth intermediate body 10H in which the spinning core 106 is inserted, so that the opening end part 104 of the eighth intermediate body 10H is reduced in diameter and The 10th intermediate body 10J which is an intermediate body of the umbrella member 82 is shape | molded. Specifically, the opening end of the eighth intermediate body 10H is rotated while rotating the eighth intermediate body 10H in which the protrusion 106A of the spinning core 106 is inserted around the axis of the eighth intermediate body 10H. The position where this load is applied is changed along the axial direction of the eighth intermediate body 10H while applying a load to the side surface near the portion 104. By applying such room-temperature spinning processing to the eighth intermediate body 10H, the diameter of the eighth intermediate body 10H near the opening end 104 is reduced to form the tenth intermediate body 10J.

  Next, the spinning core 106 is extracted from the tenth intermediate body 10J. In other words, the spinning core 106 is removed from the tenth intermediate body 10J.

  Next, as shown in FIG. 9D, the incompressible fluid 86 is injected into the tenth intermediate 10J.

  Next, the incompressible fluid 86 injected into the tenth intermediate body 10J is sealed by inserting the molding core 108 into the opening 110 of the tenth intermediate body 10J. The mold forming core 108 used here includes an insertion shaft portion 108A having the same outer diameter as the inner diameter of the shaft member 84 of the intake / exhaust valve 80, and this insertion shaft portion 108A is the tenth intermediate body 10J. It is inserted into the opening portion 110.

  In other words, the inside of the tenth intermediate body 10J is filled with the incompressible fluid 86, and the incompressible fluid 86 is enclosed in the tenth intermediate body 10J by closing the tenth intermediate body 10J with the mold forming core 108. To do.

  Next, as shown in FIGS. 9E and 9F, press molding using the mold 112 for molding the umbrella member 82 is carried out to the tenth intermediate body in which the incompressible fluid 86 is sealed. 10J, the umbrella member 82 is formed. The mold 112 used here includes an upper mold 114 and a lower mold 116. Here, deep drawing is applied to the tenth intermediate 10J. Specifically, the tenth intermediate body 10J in which the incompressible fluid 86 is sealed is placed in a mold 112 composed of an upper mold 114 and a lower mold 116, and a load is applied to the tenth intermediate body by the mold 112. 10J is added from the outside of the tenth intermediate 10J. The umbrella member 82 is formed by applying such deep drawing to the tenth intermediate body 10J.

  Next, the mold forming core 108 is removed from the umbrella member 82, and the incompressible fluid 86 is discharged from the umbrella member 82. Specifically, the insertion shaft portion 108 </ b> A of the mold forming core 108 is pulled out from the umbrella member 82, and the incompressible fluid 86 is discharged from the umbrella member 82.

  Each procedure described above is the same as that of the second embodiment except that the member to be molded is the umbrella member 82.

  Next, the shaft member 84 formed separately from the umbrella member 82 and the umbrella member 82 are integrated. This is the same as in the sixth embodiment.

  By the way, when the base end portion 84B which is the end portion on the opposite side to the tip end portion 84A which is an end portion integrated with the umbrella member 82 of the shaft member 84 has an opening portion, for example, as described above, the umbrella member 82 and the shaft member 84 are integrated, and then the opening portion of the base end portion 84B is closed.

  The intake / exhaust valve 80 can be manufactured as described above.

  Note that the order of integrating the umbrella member 82 and the shaft member 84 and the procedure of closing the opening of the base end portion 84B of the shaft member 84 may be reversed.

  As described above, according to the method for manufacturing the intake / exhaust valve 80 of the present embodiment, the incompressible fluid 86 is sealed in the mold intermediate core 108 inside the tenth intermediate body 10J. The umbrella member 82 is formed by press molding using the mold 112 constituted by the upper mold 114 and the lower mold 116. For this reason, the volume of the location used as the hollow part of the umbrella member 82 can be ensured by the volume of the incompressible fluid 86 filled in the inside of the tenth intermediate body 10J. Therefore, the volume of the hollow portion of the umbrella member 82 can be made constant while suppressing variations between products. In addition, the manufacturing method of the intake / exhaust valve 80 is that the room temperature spinning process is performed on the eighth intermediate body 10H and the press molding using the mold 112 composed of the upper mold 114 and the lower mold 116 is performed at the 10th intermediate position at room temperature. Since it is applied to the body 10J, the umbrella member 82 can be molded at room temperature. Therefore, for example, it is not necessary to preheat the eighth intermediate body 10H and the tenth intermediate body 10J in order to form the umbrella member 82. Therefore, the manufacturing process can be simplified. Further, according to the method of manufacturing the intake / exhaust valve 80, the shaft member 84 formed separately from the umbrella member 82 is used, and therefore, for example, a cylindrical member can be applied as the shaft member 84. For this reason, the special operation | work for shape | molding the shaft member 84 becomes unnecessary. Therefore, the manufacturing process can be simplified also in this respect.

  In this way, the complicated processing work of forming an umbrella member by hot working as in the prior art becomes unnecessary, and only by the above-mentioned room temperature spinning process and press forming (deep drawing process) using the mold 112 at room temperature. In other words, the umbrella member 82 can be molded at room temperature.

  By the way, the material 102 used for such an intake / exhaust valve 80 is cold-worked when the above-described room temperature spinning process and press molding (deep drawing process) using the mold 112 at room temperature are performed. Therefore, the processing speed when processing the intake / exhaust valve 80 can be improved, and a large processing machine for performing the hot processing that has been conventionally required becomes unnecessary.

[Embodiment 8]
Next, a method for manufacturing the intake / exhaust valve 80 according to Embodiment 8 of the present invention will be described. In the manufacturing method of the intake / exhaust valve 80 according to the eighth embodiment of the present invention, the umbrella member 82 is formed in the same manner as the manufacturing method of the third embodiment described above. Unless otherwise specified, the same components as those in the above-described sixth to seventh embodiments are denoted by the same reference numerals and description thereof is omitted.

  FIG. 10 is a sectional view showing a manufacturing procedure of the intake / exhaust valve 80 according to Embodiment 8 of the present invention.

  First, as shown in FIGS. 10A and 10B, using a mold 100 composed of an upper mold 96 and a lower mold 98, the metal material 102 is deep drawn, in other words, By performing press molding, the eighth intermediate body 10H which is a bottomed cylindrical body is molded. This is the same as in the seventh embodiment described above.

  Next, as shown in FIG. 10C, a cup 118 whose outer shape opens in a shape along the bottomed inner wall surface of the eighth intermediate body 10H is connected to the open end of the eighth intermediate body 10H. It inserts into the inside of the 8th intermediate body 10H from 104, and is closely_contact | adhered to the inner wall face of the 8th intermediate body 10H. The cup 118 used here is made of a metal having a higher thermal conductivity than the eighth intermediate 10H. In other words, a cup 118 of a high heat transfer material that opens in a shape along the inner wall surface of the eighth intermediate body 10H and that can also be deformed by the deformation of the eighth intermediate body 10H is provided as the eighth intermediate body. Adhere to the inner wall of 10H.

  Next, as shown in FIG. 10D, the spinning core 106 for reducing the diameter of the opening end 104 of the metal-made eighth intermediate body 10 </ b> H having a bottomed cylindrical shape is used as the eighth core. It inserts into the inside of the 8th intermediate body 10H from the opening edge part 104 of the intermediate body 10H. This is the same as in the seventh embodiment described above. More specifically, however, the protrusion 106A of the spinning core 106 is inserted into the cup 118 that is in close contact with the inner wall surface of the eighth intermediate 10H. Also, the spinning processing core 106 used here is constituted by a protrusion 106A having an outer diameter equal to or larger than the inner diameter of the shaft member 84 of the intake / exhaust valve 80, as in the seventh embodiment. is there.

  Next, the room temperature spinning process is performed on the opening end part 104 of the eighth intermediate body 10H in which the spinning core 106 is inserted, so that the opening end part 104 of the eighth intermediate body 10H is reduced in diameter and The 10th intermediate body 10J which is an intermediate body of the umbrella member 82 is shape | molded. This point is also the same as in the seventh embodiment.

  Next, as shown in FIG. 10E, the spinning core 106 is extracted from the tenth intermediate 10J, and the incompressible fluid 86 is injected into the tenth intermediate 10J. This point is also the same as in the seventh embodiment. More specifically, however, the incompressible fluid 86 is injected into the deformable body 118A of the cup 118 that is in close contact with the inner wall surface of the tenth intermediate body 10J.

  Next, the incompressible fluid 86 injected into the tenth intermediate body 10J is sealed by inserting the molding core 108 into the opening 110 of the tenth intermediate body 10J. This point is also the same as in the seventh embodiment. More specifically, however, the mold-forming core 108 is inserted into the deformable body 118A of the cup 118 that is in close contact with the inner wall surface of the tenth intermediate body 10J. The mold forming core 108 used here includes an insertion shaft portion 108A having the same outer diameter as the inner diameter of the shaft member 84 of the intake / exhaust valve 80, and this insertion shaft portion 108A is the tenth intermediate body. The point of being inserted into the opening portion 110 of 10J is the same as in the seventh embodiment.

  Next, as shown in FIGS. 10F and 10G, press molding using the mold 112 for molding the umbrella member 82 is performed with the tenth intermediate in which the incompressible fluid 86 is sealed. 10J, the umbrella member 82 is formed. This point is also the same as in the seventh embodiment. Further, the mold 112 used here is the same as that of the above-described seventh embodiment in that it is composed of an upper mold 114 and a lower mold 116.

  Next, the mold forming core 108 is removed from the umbrella member 82, and the incompressible fluid 86 is discharged from the umbrella member 82. This point is also the same as in the seventh embodiment.

  Next, the shaft member 84 formed separately from the umbrella member 82 and the umbrella member 82 are integrated. This point is also the same as in the seventh embodiment.

  By the way, when the base end portion 84B which is the end portion on the opposite side to the tip end portion 84A which is an end portion integrated with the umbrella member 82 of the shaft member 84 has an opening portion, for example, as described above, the umbrella member 82 and the shaft member 84 are integrated, and then the opening portion of the base end portion 84B is closed.

  The intake / exhaust valve 80 can be manufactured as described above.

  Note that the order of integrating the umbrella member 82 and the shaft member 84 and the procedure of closing the opening of the base end portion 84B of the shaft member 84 may be reversed.

  When the intake / exhaust valve 80 formed from the eighth intermediate body 10H is supported by the cylinder head of the engine and used by such a method of manufacturing the intake / exhaust valve 80, the umbrella member 82 of the intake / exhaust valve 80 is removed from the combustion chamber. The received heat is transferred from the metal constituting the eighth intermediate 10 </ b> H to the metal constituting the cup 118. Here, the metal constituting the cup 118 has higher thermal conductivity than the metal constituting the eighth intermediate 10H. For this reason, the heat transmitted to the metal constituting the cup 118 is easily transmitted to the shaft member 84 side. Therefore, the efficiency of exhaust heat from the combustion chamber of the engine to the outside by the intake / exhaust valve 80 can be further improved.

  Further, as described above, by applying a load to the side surface of the eighth intermediate body 10H and the outer surface of the tenth intermediate body 10J, the high heat transfer material inside the eighth intermediate body 10H and the tenth intermediate body 10J Since the cup 118 is deformed together with the eighth intermediate body 10H and the tenth intermediate body 10J, the two-layer intake / exhaust valve 80 of the material of the eighth intermediate body 10H and the high heat transfer material of the cup 118 can be easily formed. .

[Embodiment 9]
Next, a method for manufacturing the intake / exhaust valve 80 according to Embodiment 9 of the present invention will be described. In the manufacturing method of the intake / exhaust valve 80 according to the ninth embodiment of the present invention, the umbrella member 82 is formed in the same manner as the manufacturing method of the fourth embodiment described above. Unless otherwise specified, the same components as those of the above-described sixth to eighth embodiments are denoted by the same reference numerals and description thereof is omitted.

  FIG. 11 is a sectional view showing the manufacturing procedure of the intake / exhaust valve 80 according to Embodiment 9 of the present invention.

  First, as shown in FIG. 11A, the outer diameter of the umbrella member forming core 120, which is the same shape as the inner shape of the umbrella member 82, and the inner diameter of the shaft member 84 of the intake / exhaust valve 80 are set. The third shaft-forming core 122 is inserted into the eighth intermediate body 10H from the open end 104 of the eighth intermediate body 10H. The umbrella member forming core 120 used here is made of a material having a melting point lower than that of the bottomed cylindrical metallic eighth intermediate body 10H. Further, the third shaft portion forming core 122 is made of a material having a higher melting point than the umbrella member forming core 120.

  Here, the core 120 for molding the umbrella member corresponds to the fact that the peripheral portion around the axis of the umbrella member 82 of the intake / exhaust valve 80 is funnel-shaped as described above. The umbrella member forming core 120 has a truncated cone-shaped portion. From the upper bottom of the truncated cone-shaped portion, a cylinder having the same radius as that of the upper bottom has its central axis and the truncated cone-shaped portion. The center axis of each of them is aligned to extend somewhat. For this reason, the outer shape of the umbrella member molding core 120 is the same as the inner shape of the funnel-shaped umbrella member 82 around the axis. Further, the outer diameter of the column portion of the umbrella member forming core 120 is the same as the outer diameter of the third shaft portion forming core 122.

  Such an umbrella-member-forming core 120 is disposed such that the bottom bottom of the truncated cone portion is in close contact with the bottom wall of the inner diameter portion of the eighth intermediate body 10H. At this time, the umbrella member forming core 120 and the third shaft portion forming core 122 are arranged such that the central axes thereof coincide with the central axis of the eighth intermediate body 10H.

  Next, as shown in FIGS. 11B and 11C, the normal temperature spinning process is performed by inserting the umbrella member forming core 120 and the third shaft portion forming core 122 into the interior. The eleventh intermediate body 10K, which is an intermediate body of the umbrella member 82, is formed on the intermediate body 8H. Specifically, the eighth intermediate member 10H into which the umbrella member forming core 120 and the third shaft portion forming core 122 are inserted is rotated around the axis of the eighth intermediate member 10H, while the eighth intermediate member 10H is rotated. While applying a load to the side surface of the body 10H, the position to apply this load is changed along the axial direction of the eighth intermediate body 10H.

  Next, the third shaft forming core 122 is pulled out from the eleventh intermediate body 10K.

  Next, the umbrella member-forming core 120 is melted by heating the eleventh intermediate member 10K, and the fluid of the umbrella member-forming core 120 is discharged from the eleventh intermediate member 10K.

  Next, the end portion 124 of the eleventh intermediate body 10K is cut to form the umbrella member 82 (for the cutting position, see the position indicated by the arrow D in FIG. 11C). Specifically, the end 124 opposite to the portion of the eleventh intermediate 10K that was the bottom 94 of the eighth intermediate 10H is removed from the eleventh intermediate 10K. More specifically, the above-described room temperature spinning process is applied to the eighth intermediate body 10H, and a portion where the inner diameter gradually decreases along the axial direction is referred to as an umbrella member 82.

  Each procedure described above is the same as that of the above-described fourth embodiment except that the member to be molded is the umbrella member 82.

  Next, as shown in FIGS. 7A and 7B, the shaft member 84 formed separately from the umbrella member 82 and the umbrella member 82 are integrated.

  By the way, when the base end portion 84B which is the end portion on the opposite side to the tip end portion 84A which is an end portion integrated with the umbrella member 82 of the shaft member 84 has an opening portion, for example, as described above, the umbrella member 82 and the shaft member 84 are integrated, and then the opening portion of the base end portion 84B is closed.

  The intake / exhaust valve 80 can be manufactured as described above.

  Note that the order of integrating the umbrella member 82 and the shaft member 84 and the procedure of closing the opening of the base end portion 84B of the shaft member 84 may be reversed.

  As described above, according to the method for manufacturing the intake / exhaust valve 80 of the present embodiment, the umbrella member forming core 120 and the third shaft portion forming core 122 are inserted into the eighth intermediate body 10H. In this state, the umbrella member 82 (eleventh intermediate body 10K) is formed by normal temperature spinning. Therefore, the hollow portion of the umbrella member 82 (the eleventh intermediate body 10K) can be accurately molded according to the shape of the umbrella member molding core 120. For this reason, the shape of the hollow part of the umbrella member 82 (11th intermediate body 10K) can be made constant while suppressing variations between products. Further, in the manufacturing method of the intake / exhaust valve 80, the umbrella member 82 (the eleventh intermediate body 10K) is formed by performing the room temperature spinning process on the eighth intermediate body 10H to form the umbrella member 82 (the eleventh intermediate body 10K). Molding can be done at room temperature. Therefore, for example, it is not necessary to preheat the eighth intermediate body 10H in order to form the umbrella member 82 (the eleventh intermediate body 10K). Therefore, the manufacturing process can be simplified. Further, after the eleventh intermediate body 10K is molded, the third shaft portion molding core 122 is pulled out from the eleventh intermediate body 10K and then the eleventh intermediate body 10K is heated to melt the umbrella member molding core 120. The fluid of the umbrella member forming core 120 can be discharged from the eleventh intermediate body 10K. In this way, the umbrella member forming core 120 can be easily removed from the inside of the eleventh intermediate body 10K. Further, according to the method of manufacturing the intake / exhaust valve 80, the shaft member 84 formed separately from the umbrella member 82 is used, and therefore, for example, a cylindrical member can be applied as the shaft member 84. For this reason, the special operation | work for shape | molding the shaft member 84 becomes unnecessary. Therefore, the manufacturing process can be simplified also in this respect.

  Further, as described above, since the umbrella member 82 (the eleventh intermediate body 10K) is formed using the umbrella member forming core 120 and the third shaft portion forming core 122, the umbrella member 82 (the eleventh intermediate member) is formed. The body 10K) can be easily molded, and the shape of the inside of the umbrella member 82 (the eleventh intermediate body 10K), in other words, the shape of the hollow portion of the umbrella member 82 (the eleventh intermediate body 10K) is used for forming the umbrella member. It can be accurately molded according to the external shapes of the core 120 and the third shaft-forming core 122.

  Further, as described above, since the umbrella member molding core 120 is made of a low melting point material, heat is transmitted to the umbrella member molding core 120 by heating the eleventh intermediate body 10K. The molding core 120 can be melted. Therefore, not only can the umbrella member molding core 120 be inserted into the eighth intermediate body 10H to mold the eleventh intermediate body 10K, but the umbrella member molding core 120 can be melted as described above. The fluid of the molding core 120 can be easily taken out from the eleventh intermediate 10K.

[Embodiment 10]
Next, a method for manufacturing the intake / exhaust valve 80 according to Embodiment 10 of the present invention will be described. In the manufacturing method of the intake / exhaust valve 80 according to the tenth embodiment of the present invention, the umbrella member 82 is formed in the same manner as the manufacturing method according to the fifth embodiment described above. Unless otherwise specified, the same components as those in the above-described sixth to ninth embodiments are denoted by the same reference numerals and description thereof is omitted.

  FIG. 12 is a sectional view showing a manufacturing procedure of the intake / exhaust valve 80 according to the tenth embodiment of the present invention.

  First, as shown in FIGS. 12A and 12B, using a mold 100 composed of an upper mold 96 and a lower mold 98, the metal material 102 is deep drawn, in other words, By performing press molding, the eighth intermediate body 10H which is a bottomed cylindrical body is molded. This is the same as in the seventh and eighth embodiments described above.

  Next, as shown in FIG. 12C, in order to reduce the diameter of the umbrella member-forming core 120, which is the same shape as the inner shape of the umbrella member 82, and the open end 104 of the eighth intermediate body 10H. The spinning core 126 is inserted into the eighth intermediate body 10H from the open end 104 of the eighth intermediate body 10H. The umbrella member-forming core 120 used at this time is made of a material having a melting point lower than that of the bottomed cylindrical metal-made eighth intermediate 10H as described in the ninth embodiment. The spinning core 126 includes a protrusion 126A having an outer diameter equal to or larger than the inner diameter of the shaft member 84 of the intake / exhaust valve 80.

  Specifically, the core 120 for forming the umbrella member is arranged so that the lower bottom of the truncated cone portion is in close contact with the bottom wall of the inner diameter portion of the eighth intermediate body 10H. This is the same as in the ninth embodiment. At this time, the core 120 for forming the umbrella member and the core 126 for spinning are arranged so that the central axis thereof coincides with the central axis of the eighth intermediate body 10H.

  Next, room temperature spinning is performed on the opening end 104 of the eighth intermediate 10H in which the umbrella member forming core 120 and the spinning core 126 are inserted, whereby the eighth intermediate 10H A twelfth intermediate body 10L, which is an intermediate body of the umbrella member 82, whose opening end 104 is reduced in diameter is molded.

  Specifically, the eighth intermediate member 10H into which the protrusions 126A of the umbrella member forming core 120 and the spinning core 126 are inserted is rotated around the axis of the eighth intermediate member 10H while the eighth intermediate member 10H is rotated. The position where this load is applied is changed along the axial direction of the eighth intermediate body 10H while applying a load to the side surface near the opening end 104 of the body 10H. By subjecting the eighth intermediate body 10H to such room temperature spinning processing, the diameter of the eighth intermediate body 10H near the opening end 104 is reduced to form the twelfth intermediate body 10L.

  Next, the spinning core 126 is pulled out from the twelfth intermediate body 10L.

  Next, the fourth shaft forming core 128 is inserted into the twelfth intermediate body 10L. At this time, the umbrella member forming core 120 and the fourth shaft portion forming core 128 are arranged such that the central axes thereof coincide with the central axis of the twelfth intermediate body 10L. The fourth shaft-forming core 128 used here includes an insertion shaft portion 128A having the same outer diameter as the inner diameter of the shaft member 84 of the intake / exhaust valve 80, and this insertion shaft portion 128A is the twelfth intermediate body. It is inserted into the 10 L opening portion 129. The fourth shaft molding core 128 is made of a material having a higher melting point than the umbrella member molding core 120.

  Next, as shown in FIGS. 12D and 12E, press molding using a mold 112 for molding the umbrella member 82 is performed for forming the umbrella member-forming core 120 and the fourth shaft portion. An umbrella member 82 is formed by applying the core 128 to the twelfth intermediate body 10L inserted therein.

  Next, the fourth shaft forming core 128 is pulled out from the umbrella member 82.

  Next, the umbrella member forming core 120 is melted by heating the umbrella member 82, and the fluid of the umbrella member forming core 120 is discharged from the umbrella member 82.

  Next, the shaft member 84 formed separately from the umbrella member 82 and the umbrella member 82 are integrated.

  By the way, when the base end portion 84B which is the end portion on the opposite side to the tip end portion 84A which is an end portion integrated with the umbrella member 82 of the shaft member 84 has an opening portion, for example, as described above, the umbrella member 82 and the shaft member 84 are integrated, and then the opening portion of the base end portion 84B is closed.

  The intake / exhaust valve 80 can be manufactured as described above.

  Note that the order of integrating the umbrella member 82 and the shaft member 84 and the procedure of closing the opening of the base end portion 84B of the shaft member 84 may be reversed.

  As described above, according to the method for manufacturing intake / exhaust valve 80 of the present embodiment, umbrella member forming core 120 and fourth shaft portion forming core 128 are inserted into twelfth intermediate body 10L. In this state, the umbrella member 82 is formed by press molding using the mold 112 composed of the upper mold 114 and the lower mold 116. Therefore, the hollow portion of the umbrella member 82 can be accurately formed in accordance with the shape of the umbrella member forming core 120. For this reason, the shape of the hollow portion of the umbrella member 82 can be made constant while suppressing variations between products. In addition, the manufacturing method of the intake / exhaust valve 80 is that the room temperature spinning process is applied to the eighth intermediate body 10H and the press molding using the mold 112 composed of the upper mold 114 and the lower mold 116 is performed at the twelfth middle stage at room temperature. Since it is applied to the body 10L, the umbrella member 82 can be molded at room temperature. For this reason, for example, it is not necessary to preheat the eighth intermediate body 10H and the twelfth intermediate body 10L in order to form the umbrella member 82. Therefore, the manufacturing process can be simplified. Further, after the umbrella member 82 is molded, the fourth shaft-forming core 128 is pulled out of the umbrella member 82 and then the umbrella member 82 is heated to melt the umbrella member-forming core 120. The fluid of the child 120 can be discharged from the umbrella member 82. In this way, the umbrella member forming core 120 can be easily removed from the inside of the umbrella member 82. Further, according to the method of manufacturing the intake / exhaust valve 80, the shaft member 84 formed separately from the umbrella member 82 is used, and therefore, for example, a cylindrical member can be applied as the shaft member 84. For this reason, the special operation | work for shape | molding the shaft member 84 becomes unnecessary. Therefore, the manufacturing process can be simplified also in this respect.

  Further, as described above, since the umbrella member 82 is formed using the umbrella member forming core 120 and the fourth shaft portion forming core 128, the umbrella member 82 can be easily formed and the umbrella member 82 is formed. In other words, the shape of the hollow portion of the umbrella member 82 can be accurately formed according to the external shapes of the umbrella member forming core 120 and the fourth shaft portion forming core 128.

  Further, as described above, since the umbrella member molding core 120 is made of a low melting point material, heat is transmitted to the umbrella member molding core 120 by heating the umbrella member 82, and this umbrella member molding core is used. The core 120 can be melted. Therefore, not only can the umbrella member molding core 120 be inserted into the twelfth intermediate body 10L to mold the umbrella member 82, but the umbrella member molding core 120 can be melted as described above to mold the umbrella member. The fluid of the core 120 can be easily taken out from the umbrella member 82.

  As described above, in the method of manufacturing the intake / exhaust valve 80 according to Embodiments 6 to 10 of the present invention, when the umbrella member 82 and the shaft member 84 are integrated, the umbrella member 82 and the shaft member 84 are It is also possible to integrate the umbrella member 82 and the shaft member 84 by welding or joining using the position fixing mold 130.

  More specifically, as shown in FIG. 13, when the umbrella member 82 and the shaft member 84 are welded or joined, a mold 130 for adjusting the axial dimension of the intake / exhaust valve 80 to the product dimension L1 is used. A certain sheet positioning jig may be used. When this sheet positioning jig 130 is used, when the umbrella member 82 is fitted into the holding hole 130 </ b> A of the sheet positioning jig 130 in a state where the tip portion 84 </ b> A of the pipe member (shaft member) 84 is inserted into the umbrella member 82, for example. The axial dimension L2 of the portion of the pipe member 84 inserted into the umbrella member 82 is adjusted.

  For example, when the axial dimension of the pipe member 84 is larger than the product dimension L1, when the umbrella member 82 is fitted into the sheet positioning jig 130, the base end portion 84B of the pipe member 84 is the sheet positioning jig. The tip end portion 84A of the pipe member 84 is pushed into the inside of the umbrella member 82 by the reaction force of the force that the base end portion 84B of the pipe member 84 presses the bottom portion 130B of the sheet positioning jig 130 in contact with the bottom portion 130B of the pipe member 130. It is. On the other hand, when the dimension of the pipe member 84 in the axial direction is smaller than the product dimension L1, when the umbrella member 82 is fitted into the sheet positioning jig 130, the pipe member 84 depends on its own weight. The end portion 84B slides down until it interferes with the bottom portion 130B of the sheet positioning jig 130, and a part of the tip end portion 84A is pulled out from the inside of the umbrella member 82. Thus, the variation in the axial dimension of the pipe member 84 can be corrected by changing the axial dimension L2 of the portion of the pipe member 84 inserted into the umbrella member 82.

  Next, after adjusting the axial dimension of the pipe member 84 to the product dimension L1, the pipe member is near the edge portion of the opened end portion 83 of the umbrella member 82 and the edge portion of the end portion 83 of the umbrella member 82. Of 84, the part exposed from the umbrella member 82 is welded or joined.

  Thus, by connecting the umbrella member 82 and the pipe member 84 using the sheet positioning jig 130, the axial dimension of the intake / exhaust valve 80 can be adjusted to the product dimension L1. For this reason, the axial dimension of the pipe member 84 can be made equal to the product dimension L1 without maintaining the axial dimensional accuracy of each of the umbrella member 82 and the pipe member 84.

  As described above, the umbrella member 82 and the shaft member 84 are integrated by welding or joining. At this time, since the sheet positioning jig 130 for fixing the position of the umbrella member 82 and the shaft member 84 is used, the umbrella member 82 and the shaft member 84 can be easily integrated.

  Further, as described above, cup 46 and cup 118 are disposed in close contact with the bottomed inner wall surface of first intermediate body 10A of the third embodiment or eighth intermediate body 10H of the eighth embodiment. However, the present invention is not limited to this. The cup 46 may be arranged in close contact with the bottomed inner wall surface of the first intermediate body 10A according to the first embodiment, or 2, 4, 5 of the first embodiment. It may be arranged in close contact with the bottomed inner wall surface of the eighth intermediate body 10H of the form 6, or 7, 9, 10.

  Further, the first intermediate 10A or the eighth intermediate 10H of the first embodiment, or 4, 5, 6, 9, 10 is the same as that described in the second embodiment, 3, 7, 8, or 8. In addition, the first intermediate body 10A or the eighth intermediate body 10H may be formed from the material 32 or the material 102 by press molding using the mold 30 or the mold 112.

  As mentioned above, although the manufacturing method of the intake / exhaust valves 10 and 80 which concern on Embodiment 1-10 of this invention was demonstrated, this invention is not restricted to this. In the present invention, the second intermediate portion is formed by a procedure for closing the open end portion of the shaft portion intermediate body 14A or by a procedure for closing the base end portion 84B when the base end portion 84B of the shaft member 84 is open. The refrigerant is injected into the body 10B, the fourth intermediate body 10D, the fifth intermediate body 10E, and the seventh intermediate body 10G, and then the open end of the shaft intermediate body 14A is closed, or, for example, the inside of the umbrella member 82 The base end portion 84B of the shaft member 84 may be closed after the refrigerant is injected into the shaft. Examples of this refrigerant include metal Na and the like.

  Furthermore, when the intake / exhaust valve 10 or the intake / exhaust valve 80 into which the refrigerant is injected as described above is slidably supported by the cylinder head of the internal combustion engine, the internal combustion engine is driven. When the intake / exhaust valve 10 or the intake / exhaust valve 80 is moved along the axial direction, the heat of the combustion chamber received by the umbrella part 12 or the umbrella member 82 passes through the refrigerant and the umbrella part of the shaft part 14 is moved. 12 or the shaft member 84 is moved to the opposite side of the umbrella member 82. In this way, exhaust heat treatment in the combustion chamber of the internal combustion engine is promoted. Therefore, the thermal efficiency in the thermal cycle of the internal combustion engine can be improved, and the driving force of the internal combustion engine can be improved.

  As described above, the method for manufacturing the intake and exhaust valves 10 and 80 according to the present invention is useful as a method for manufacturing the intake and exhaust valves supported by the cylinder head of the internal combustion engine, and in particular, a method for manufacturing the hollow intake and exhaust valves. Useful as.

It is sectional drawing which shows an example of the intake / exhaust valve which concerns on Embodiment 1-2 of this invention, and 4-5. It is sectional drawing which shows the manufacture procedure of the intake / exhaust valve which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the manufacture procedure of the intake / exhaust valve which concerns on Embodiment 2 of this invention. It is sectional drawing which shows the manufacture procedure of the intake / exhaust valve which concerns on Embodiment 3 of this invention. It is sectional drawing which shows the manufacture procedure of the intake / exhaust valve which concerns on Embodiment 4 of this invention. It is sectional drawing which shows the manufacture procedure of the intake / exhaust valve which concerns on Embodiment 5 of this invention. It is sectional drawing which shows the operation | work which integrates the umbrella member and shaft member of the intake / exhaust valve which concern on Embodiment 6-10 of this invention. It is sectional drawing which shows the manufacture procedure of the intake / exhaust valve which concerns on Embodiment 6 of this invention. It is sectional drawing which shows the manufacture procedure of the intake / exhaust valve which concerns on Embodiment 7 of this invention. It is sectional drawing which shows the manufacture procedure of the intake / exhaust valve which concerns on Embodiment 8 of this invention. It is sectional drawing which shows the manufacture procedure of the intake / exhaust valve which concerns on Embodiment 9 of this invention. It is sectional drawing which shows the manufacture procedure of the intake / exhaust valve which concerns on Embodiment 10 of this invention. It is sectional drawing which shows the modification of the operation | work which integrates the umbrella member and shaft member of the intake / exhaust valve which concern on Embodiment 6-10 of this invention.

Explanation of symbols

10 Intake / Exhaust Valve 10A 1st Intermediate 10B 2nd Intermediate 10C 3rd Intermediate 10D 4th Intermediate 10E 5th Intermediate 10F 6th Intermediate 10G 7th Intermediate 10H 8th Intermediate 10I 9th Intermediate 10J 10th intermediate body 10K 11th intermediate body 10L 12th intermediate body 12 Umbrella part 12A Umbrella part intermediate body 14 Shaft part 14A Shaft part intermediate body 16 Incompressible fluid 18 Opening part of 1st intermediate body 20 Lid member 22 1st intermediate body Bottom of the body 24 End of the shaft intermediate body 26 Upper mold (mold)
28 Lower mold (mold)
30 Mold 32 Metal material 34 Open end of first intermediate 36 Spinning core 36A Protrusion 38 Mold molding core 39 Opening of third intermediate 40 Mold 42 Upper mold 44 Lower mold 46 Cup 48 Umbrella forming core 50 First shaft forming core 52 End of shaft intermediate body 54 Spinning core 54A Projection 56 Second shaft forming core 80 Intake / exhaust valve 82 Umbrella Member 84 Shaft member 84B The base end of the shaft member (the end opposite to the end integrated with the umbrella member of the shaft member)
86 Incompressible fluid 88 Opening portion of the eighth intermediate 90 Cover member 94 Bottom of the eighth intermediate 104 Opening end of the eighth intermediate 106 Spinning core 106A Protrusion 108 Mold forming core 110 10 Opening part of intermediate body 112 Mold 114 Upper mold (mold)
116 Lower mold (mold)
118 Cup 120 Umbrella member forming core 122 Third shaft portion forming core 124 End portion of the eleventh intermediate body 126 Spinning core 126A Projection portion 128 Fourth shaft portion forming core

Claims (11)

A method of manufacturing an intake and exhaust valve comprising an umbrella part and a shaft part,
Filling the incompressible fluid into the inside of the metal first intermediate body having a bottomed cylindrical shape;
Sealing the incompressible fluid filled in the first intermediate by closing the opening of the first intermediate with a lid member;
A room temperature spinning process is performed on the first intermediate body in which the incompressible fluid is sealed, and a second intermediate body composed of the umbrella section and a shaft section intermediate body that is an intermediate body of the shaft section is formed. Molding procedure;
Removing the lid member from the second intermediate and discharging the incompressible fluid from the second intermediate;
Cutting the end of the shaft intermediate, and
A procedure of closing the opening of the shaft intermediate body and molding the shaft portion;
The manufacturing method of the intake / exhaust valve characterized by including. A method of manufacturing an intake and exhaust valve comprising an umbrella part and a shaft part,
During the spinning process for reducing the diameter of the open end of the first intermediate body made of metal, which is composed of a protrusion having an outer diameter equal to or larger than the inner diameter of the shaft portion of the intake / exhaust valve Inserting a child into the first intermediate body from the open end of the first intermediate body;
The room temperature spinning process is performed on the opening end of the first intermediate body in which the spinning core is inserted, so that the opening end of the first intermediate body is reduced in diameter and A step of forming a third intermediate body having an umbrella intermediate body that is an intermediate body;
Extracting the spinning core from the third intermediate;
Injecting an incompressible fluid into the interior of the third intermediate;
The incompressible fluid injected into the third intermediate body by inserting a mold-forming core having the same outer diameter as the inner diameter of the shaft portion of the intake / exhaust valve into the opening of the third intermediate body And the procedure of sealing
Applying press molding using a mold for molding a shaft intermediate that is an intermediate between the umbrella and the shaft to the third intermediate in which the incompressible fluid is sealed, Forming a fourth intermediate body composed of an umbrella part and the shaft intermediate body;
Removing the mold-forming core from the fourth intermediate and discharging the incompressible fluid from the fourth intermediate;
A procedure of closing the opening of the shaft intermediate body and molding the shaft portion;
The manufacturing method of the intake / exhaust valve characterized by including. A method of manufacturing an intake and exhaust valve comprising an umbrella part and a shaft part,
An umbrella forming core made of a material having the same shape as the inner shape of the umbrella portion and having a lower melting point than the first metal intermediate body having a bottomed cylindrical shape; and the shaft portion of the intake / exhaust valve. A first shaft molding core having the same outer diameter as the inner diameter and made of a material having a higher melting point than the umbrella molding core is inserted into the first intermediate body from the opening end of the first intermediate body. Inserting into the intermediate,
The room temperature spinning process is performed on the first intermediate body in which the umbrella part forming core and the first shaft part forming core are inserted, and the umbrella part and the shaft part intermediate body are configured. Forming a fifth intermediate to be formed;
A procedure for pulling out the first shaft-forming core from the fifth intermediate;
A step of melting the umbrella molding core by heating the fifth intermediate and discharging the fluid of the umbrella molding core from the fifth intermediate;
Cutting the end of the shaft intermediate, and
A procedure of closing the opening of the shaft intermediate body and molding the shaft portion;
The manufacturing method of the intake / exhaust valve characterized by including. A method of manufacturing an intake and exhaust valve comprising an umbrella part and a shaft part,
An umbrella forming core made of a material having the same shape as the inner shape of the umbrella portion and having a lower melting point than the first metal intermediate body having a bottomed cylindrical shape; and the shaft portion of the intake / exhaust valve. A spinning core configured to reduce the diameter of the opening end of the first intermediate body, which is constituted by a protrusion having an outer diameter equal to or larger than the inner diameter, is formed from the opening end of the first intermediate body. A procedure for insertion into one intermediate;
An opening end portion of the first intermediate body is formed by applying room temperature spinning to the opening end portion of the first intermediate body into which the core for forming the umbrella part and the core for spinning processing are inserted. Forming a sixth intermediate body having an umbrella intermediate body that is reduced in diameter and is an intermediate body of the umbrella part;
A procedure for pulling out the spinning core from the sixth intermediate;
A second shaft-forming core having the same outer diameter as the inner diameter of the shaft portion of the intake / exhaust valve and having a higher melting point than the umbrella-forming core is used as the sixth intermediate body. The steps to insert,
In the press molding using a mold for molding the shaft portion intermediate body that is an intermediate body between the umbrella portion and the shaft portion, the umbrella portion forming core and the second shaft portion forming core are internally provided. A step of forming a seventh intermediate body composed of the umbrella part and the shaft part intermediate body by applying to the sixth intermediate body inserted in
A procedure for pulling out the second shaft-forming core from the seventh intermediate;
A step of melting the umbrella molding core by heating the seventh intermediate, and discharging a fluid of the umbrella molding core from the seventh intermediate;
A procedure of closing the opening of the shaft intermediate body and molding the shaft portion;
The manufacturing method of the intake / exhaust valve characterized by including. A method of manufacturing an intake / exhaust valve composed of an umbrella member and a shaft member,
Filling the incompressible fluid into the inside of the metal eighth intermediate body having a bottomed cylindrical shape;
Sealing the incompressible fluid filled in the eighth intermediate by closing the opening of the eighth intermediate with a lid member;
A step of performing a room temperature spinning process on the eighth intermediate body in which the incompressible fluid is sealed, and molding a ninth intermediate body that is an intermediate body of the umbrella member;
Removing the lid member from the ninth intermediate and discharging the incompressible fluid from the ninth intermediate;
Cutting the end of the ninth intermediate and molding the umbrella member;
The shaft member molded separately from the umbrella member and the procedure for integrating the umbrella member;
The manufacturing method of the intake / exhaust valve characterized by including. A method of manufacturing an intake / exhaust valve composed of an umbrella member and a shaft member,
During the spinning process for reducing the diameter of the open end portion of the metal-made eighth intermediate body, which is composed of a projection portion having an outer diameter equal to or larger than the inner diameter of the shaft member of the intake / exhaust valve. Inserting a child from the open end of the eighth intermediate body into the eighth intermediate body;
The room temperature spinning process is performed on the opening end portion of the eighth intermediate body into which the spinning core is inserted, whereby the opening end portion of the eighth intermediate body is reduced in diameter and the umbrella member A step of forming a tenth intermediate which is an intermediate;
Extracting the spinning core from the tenth intermediate;
Injecting an incompressible fluid into the interior of the tenth intermediate;
The incompressible fluid injected into the tenth intermediate body by inserting a mold-forming core having the same outer diameter as the inner diameter of the shaft member of the intake / exhaust valve into the opening of the tenth intermediate body And the procedure of sealing
Applying press molding using a mold for molding the umbrella member to the tenth intermediate body in which the incompressible fluid is sealed, and molding the umbrella member;
Removing the mold-forming core from the umbrella member and discharging the incompressible fluid from the umbrella member;
The shaft member molded separately from the umbrella member and the procedure for integrating the umbrella member;
The manufacturing method of the intake / exhaust valve characterized by including. A method of manufacturing an intake / exhaust valve composed of an umbrella member and a shaft member,
An umbrella member molding core made of a material having the same shape as the inner shape of the umbrella member and having a lower melting point than the bottomed cylindrical metal eighth intermediate, and the shaft member of the intake / exhaust valve A third shaft-forming core having the same outer diameter as the inner diameter and made of a material having a higher melting point than that of the umbrella member-forming core is connected to the eighth intermediate body from the open end of the eighth intermediate body. Inserting into the intermediate,
The room temperature spinning process is performed on the eighth intermediate body in which the core for forming the umbrella member and the core for forming the third shaft portion are inserted, and an 11th intermediate which is an intermediate body of the umbrella member A procedure for shaping the body;
A procedure of pulling out the third shaft forming core from the eleventh intermediate;
A step of melting the umbrella member molding core by heating the eleventh intermediate body and discharging the fluid of the umbrella member molding core from the eleventh intermediate body;
Cutting the end of the eleventh intermediate and molding the umbrella member;
The shaft member molded separately from the umbrella member and the procedure for integrating the umbrella member;
The manufacturing method of the intake / exhaust valve characterized by including. A method of manufacturing an intake / exhaust valve composed of an umbrella member and a shaft member,
An umbrella member molding core made of a material having the same shape as the inner shape of the umbrella member and having a lower melting point than the bottomed cylindrical metal eighth intermediate, and the shaft member of the intake / exhaust valve A spinning core for reducing the diameter of the opening end of the eighth intermediate body, which is constituted by a protrusion having an outer diameter equal to or larger than the inner diameter, is formed from the opening end portion of the eighth intermediate body. 8 inserting into the intermediate,
An opening end portion of the eighth intermediate body is subjected to room temperature spinning processing on the opening end portion of the eighth intermediate body into which the core for forming the umbrella member and the core for spinning processing are inserted. Forming a twelfth intermediate body that is an intermediate body of the umbrella member having a reduced diameter;
A procedure of pulling out the spinning core from the twelfth intermediate;
A fourth shaft forming core having the same outer diameter as the inner diameter of the shaft member of the intake / exhaust valve and made of a material having a higher melting point than the core for forming the umbrella member is used as the twelfth intermediate body. The steps to insert,
Press molding using a mold for molding the umbrella member is performed on the twelfth intermediate body in which the core for molding the umbrella member and the core for molding the fourth shaft portion are inserted. , A procedure for forming the umbrella member;
A procedure of pulling out the fourth shaft forming core from the umbrella member;
Melting the umbrella member molding core by heating the umbrella member, and discharging the fluid of the umbrella member molding core from the umbrella member;
The shaft member molded separately from the umbrella member and the procedure for integrating the umbrella member;
The manufacturing method of the intake / exhaust valve characterized by including. Including a procedure of closing the opening when the end of the shaft member opposite to the end integrated with the umbrella member has an opening.
The method for manufacturing an intake / exhaust valve according to any one of claims 5 to 8, wherein the intake / exhaust valve is provided. A cup having an outer shape opened in a shape along the bottomed inner wall surface of the first intermediate body and made of a metal having a higher thermal conductivity than the first intermediate body is defined as an opening end of the first intermediate body. Including a procedure of inserting into the inside of the first intermediate body from the portion and closely contacting the inner wall surface of the first intermediate body,
The method for manufacturing an intake / exhaust valve according to any one of claims 1 to 4, wherein the intake / exhaust valve is provided. A cup having an outer shape opened in a shape along the bottomed inner wall surface of the eighth intermediate body and made of a metal having a higher thermal conductivity than the eighth intermediate body is formed as an opening end of the eighth intermediate body. Including the procedure of inserting into the inside of the eighth intermediate body from the portion and closely contacting the inner wall surface of the eighth intermediate body,
The method for manufacturing an intake / exhaust valve according to any one of claims 5 to 8, wherein the intake / exhaust valve is provided.

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