Method for manufacturing scroll member

Abstract

A method for manufacturing a scroll member includes a forging step in which a forging blank comprising an aluminum alloy is forged without upsetting.

Description

TECHNICAL FIELD

[0001] The present application relates to a manufacturing method of scroll members.

[0002] This application is based on patent application No. 2024-008640 filed in Japan on January 24, 2024, the content of which is hereby incorporated by reference. BACKGROUND

[0003] As a scroll compressor, a scroll compressor having a small number of components and high quietness during rotation is known. The scroll compressor is constituted of a fixed scroll member provided with a blade portion constituted of a scroll-like wall on one face of a flange in a flat plate shape and a swing scroll member having a blade portion of substantially the same shape as the blade portion of the fixed scroll member which is fitted to swing.

[0004] These fixed scroll member and swing scroll member (hereinafter, they are collectively referred to as scroll members). From the viewpoint of weight reduction, an aluminum alloy is generally used. As a manufacturing method of such scroll members, casting, forging and the like can be cited. From the viewpoint of strength and reliability, it is preferable to manufacture by forging, and from the complexity of the shape, generally, it is manufactured by hot forging (for example, Patent Literature 1).

[0005] Figure 7 is a drawing showing an example of steps of a manufacturing method of a scroll member constituted of an aluminum alloy in the past, and is a drawing showing steps of a manufacturing method of a scroll member of Patent Literature 1.

[0006] In Figure 7 In the conventional manufacturing method of a scroll member shown in the flowchart of

[0007] The forging blank is expanded in diameter by hot upset forging at a high temperature so as to correspond to the outer diameter of the flange portion of the scroll member. The forging blank that has been hot upset forged is subjected to forging on the basis of applying a lubricant to the forging blank and the die as a work material, in order to prevent thermal sticking to the surface. Specifically, the forging blank from which cutting oil applied to the surface has been volatilized by hot upset forging is applied or sprayed with a liquid lubricant in which water or mineral oil is mixed with graphite. Furthermore, the die is applied or sprayed with a liquid lubricant in which graphite is mixed with water or mineral oil. The graphite in the liquid lubricant plays an important role in suppressing thermal sticking of the scroll member being formed, and is considered to be a necessary component for suppressing interruption of lubrication. In this state, the forging blank is placed in the die, and is processed into a prescribed shape by hot forging in which pressure is applied in a heated environment. Then, the scroll member of the prescribed shape is obtained by undergoing age hardening and being subjected to cutting processing of the surface.

[0008] Prior Art Documents

[0009] Patent Documents

[0010] Patent Document 1: Japanese Patent No. 4744766 SUMMARY

[0011] However, there is a demand for a scroll member manufacturing method that can achieve cost reduction and shortening of the manufacturing period.

[0012] The present application has been achieved in view of the above-described circumstances, and an object thereof is to provide a scroll member manufacturing method that can achieve cost reduction and shortening of the manufacturing period.

[0013] The present application has been achieved in view of the above-described circumstances, and an object thereof is to provide a scroll member manufacturing method that can achieve cost reduction and shortening of the manufacturing period.

[0014] (1) A scroll member manufacturing method according to an embodiment of the present application includes a forging step of forging a forging blank composed of an aluminum alloy without upsetting.

[0015] (2) The scroll member manufacturing method according to (1) above can include

[0016] a casting step in which a round bar composed of an aluminum alloy containing Si: 8.0 to 12.5 mass%, Cu: 1.0 to 5.0 mass%, Mg: 0.2 to 1.3 mass%, and the balance being Al and unavoidable impurities is cast;

[0017] a cutting step in which the round bar is cut as the forging blank; and

[0018] a forging step in which the forging blank is placed in a die and subjected to forging,

[0019] In the cutting process, the round bar is lubricated with a carbon compound,

[0020] In the forging process, the forging blank is lubricated with the carbon compound.

[0021] (3) The method for manufacturing the scroll member of the above (1) can be a method that has

[0022] a casting process in which a round bar composed of an aluminum alloy containing Si: 8.0 to 12.5 mass%, Cu: 1.0 to 5.0 mass%, Mg: 0.2 to 1.3 mass%, Sr: 0.005 to 0.03 mass%, and the balance of Al and unavoidable impurities is cast;

[0023] a cutting process in which the round bar is cut as a forging blank; and

[0024] a forging process in which the forging blank is placed in a die and forged,

[0025] In the cutting process, the round bar is lubricated with a carbon compound,

[0026] In the forging process, the forging blank is lubricated with the carbon compound.

[0027] (4) The method for manufacturing the scroll member of the above can be a method that has

[0028] a casting process in which a round bar composed of an aluminum alloy containing Si: 8.0 to 12.5 mass%, Cu: 1.0 to 5.0 mass%, Mg: 0.2 to 1.3 mass%, Ni: 0.1 to 2.0 mass%, and the balance of Al and unavoidable impurities is cast;

[0029] a cutting process in which the round bar is cut as a forging blank; and

[0030] a forging process in which the forging blank is placed in a die and forged,

[0031] In the cutting process, the round bar is lubricated with a carbon compound,

[0032] In the forging process, the forging blank is lubricated with the carbon compound.

[0033] (5) In the method for manufacturing the scroll member of the above (2) to (4), the carbon compound can be an oil cutting agent.

[0034] (6) In the method for manufacturing the scroll member of the above (2) to (5), the forging process can be performed after the cutting process.

[0035] (7) In the method for manufacturing the scroll member of any one of (2) to (6) above, the forging process can be performed on the forging blank having the carbon compound on the surface.

[0036] According to the present application, it is possible to provide a method for manufacturing a scroll member that can achieve cost reduction and shortening of the manufacturing period. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 is a perspective view of a scroll member of one embodiment of the present application.

[0038] Figure 2 is a flowchart showing steps of a method for manufacturing a scroll member of one embodiment of the present application.

[0039] Figure 3 is a schematic view showing a state of a forging process in a method for manufacturing a scroll member of one embodiment of the present application.

[0040] Figure 4 is a schematic view showing a state of a forging process in a method for manufacturing a scroll member of one embodiment of the present application, and is a view showing a state after that. Figure 3

[0041] Figure 5 is a schematic view showing a state of a forging process in a method for manufacturing a scroll member of a modification example of Figure 3

[0042] Figure 6 is a schematic view showing a state of a forging process in a method for manufacturing a scroll member of one embodiment of the present application, and is a view showing a state after that. Figure 5

[0043] Figure 7 is a view showing an example of steps of a conventional method for manufacturing a scroll member composed of an aluminum alloy, and is a flowchart showing steps of a method for manufacturing a scroll member of Patent Document 1. DETAILED DESCRIPTION

[0044] Hereinafter, with reference to the drawings, a forging die of a scroll member of one embodiment of the present application and a method for manufacturing a scroll member using the die will be described. Furthermore, the embodiment shown below is specifically described in order to better understand the gist of the present application, and the present application is not limited unless specifically specified. In addition, in the following description, the drawings used are sometimes shown with parts that will be main parts enlarged for the sake of convenience in order to easily understand the features of the present application, and the dimensional ratios and the like of the respective components are not necessarily the same as actual ones.

[0045] [Scroll Member] ​​​

[0046] Figure 1 is a perspective view of a scroll member of one embodiment of the present application. According to the manufacturing method of a scroll member of the present application, a scroll member 1 as shown in FIG. 1 can be manufactured. Figure 1 Figure 1 The scroll member 1 as shown in FIG. 1, for example, has a flange 2 in a circular plate shape and a scroll-shaped wall portion, i.e., a blade portion 3, which protrudes in a height direction from one face 2a of the flange 2. Such a scroll member 1 integrally forms the flange 2 and the blade portion 3 by causing a plastic flow of a forging blank using a forging die to be described later.

[0047] The height hi of the blade portion 3 from the one face 2a of the flange 2 is, for example, 40 mm or less, preferably less than 30 mm, more preferably 25 mm or less, and further preferably 20 mm or less. The height hi of the blade portion 3 from the one face 2a of the flange 2 can be arbitrarily set, and can be, for example, 10 mm or more.

[0048] The thickness of the blade portion 3 is, for example, 4.0 to 7.0 mm, and preferably 5.0 to 6.0 mm. The blade portion 3 is formed, for example, so that the ratio of the height hi to the thickness is about 2 to 5 times.

[0049] The scroll member 1 is, for example, composed of an aluminum alloy for the purpose of weight reduction. As a material of the aluminum alloy scroll member, in order to have wear resistance, an aluminum alloy to which Si is added is generally used. The added Si is crystallized as fine particles, and improves the wear resistance with respect to the object material. As a composition example of the aluminum alloy for the scroll member 1, Si: 8.0 to 12.5 mass%, Cu: 1.0 to 5.0 mass%, and Mg: 0.2 to 1.3 mass% are contained, and the balance is Al and inevitable impurities.

[0050] The Si content is proportional to the added amount of Si, and fine eutectic Si particles of several μm are dispersed and crystallized in the Al matrix up to about 11 mass%. This improves the wear resistance of the alloy. Therefore, it is preferable that the Si content be high, and by being 8.0 mass% or more, a high wear resistance effect as a sliding member such as a scroll member can be exerted. If the Si content exceeds 12.5 mass%, the Si is crystallized as primary crystals, and the primary crystals easily coarsen to several tens of μm. Therefore, the saw blade is worn at the time of cutting, the cutting edge of a tool is damaged by colliding with the primary crystals at the time of cutting in the subsequent processing, and a problem occurs in the finishing. If the stress concentration portion in the portion close to the outer surface of the forged product is aggregated, it becomes a starting point of damage and deteriorates the mechanical strength. Therefore, the Si is preferably 12.5 mass% or less.

[0051] ​Cu, when added in several mass%, increases the strength of the Al matrix by subsequent heat treatment, and also contributes to wear resistance. With Cu of 1.0 mass% or more, it is easy to contribute to an increase in strength, and even if it exceeds 5.0 mass%, the effect of increasing the strength saturates. Therefore, Cu is set to 1.0 to 5.0 mass%.

[0052] Mg, in combination with Si, becomes a fine precipitate of Mg2Si after heat treatment, and contributes to hardening of the product. Also, as a compound of the MgSiCu system, likewise, it becomes a precipitate after heat treatment, and contributes to hardening of the product, and both increase the strength. When Mg is 0.2 mass% or more, it is easy to obtain this effect, and even if the amount added exceeds 1.3 mass%, the effect does not increase. Also, in casting, it becomes a defect due to generation, mixing, etc. of oxides. Therefore, Mg is set to 0.2 to 1.3 mass%.

[0053] Further, in the present application, the aluminum alloy can also add Ni in an amount of 2.0 mass% or less as needed in order to increase the heat-resistant strength. As the amount added, an amount exceeding 0.1 mass% is effective, and by being 2.0 mass% or less, it is difficult to generate coarse crystals. Therefore, the amount of Ni added is preferably in the range of 0.1 to 2.0 mass%.

[0054] The present aluminum alloy uses so-called eutectic Si as one factor of wear resistance, but in order to make this eutectic more uniformly and finely dispersed, and also in order to suppress the generation of coarse primary crystals, it is also possible to add one or more elements selected from among Sr, Ca, Na, Sb in a total amount of 0.5 mass% or less. In the case of being contained in the aluminum alloy, it is preferable that Sb be 0.05 to 0.5 mass%, Sr be 0.005 to 0.05 mass%, and in particular, Sr can obtain an effect by being added in a small amount, and also, the amount of reduction of Sr due to oxidation, etc. at the time of melting is small, and therefore, it is preferable.

[0055] Further, the scroll member 1 of the present application is not limited to the above examples. For example, the composition example of the aluminum alloy for the scroll member 1 can also be a composition containing Si: 8.0 to 12.5 mass%, Cu: 1.0 to 5.0 mass%, Mg: 0.2 to 1.3 mass%, Sr: 0.005 to 0.03 mass%, and the balance being Al and unavoidable impurities, etc.

[0056] [Method for manufacturing scroll member]

[0057] Figure 2is a flowchart showing steps of a manufacturing method of a scroll member of one embodiment of the present application. The manufacturing method of the scroll member of the present application has a forging step of forging a forging material composed of an aluminum alloy without upsetting. The manufacturing method of the scroll member of one embodiment of the present application, for example, has a melting step, a casting step, a cutting step, a forging step, a solution treatment step, an aging treatment step, and a cutting work step in this order. In addition, a homogenization treatment step and a skinning step can be performed between the forging step and the cutting step.

[0058] (Melting Step)

[0059] First, in order to obtain an aluminum alloy having the above composition, a raw material is melted. That is, in the melting step, a raw material is melted in such a manner that an aluminum alloy containing Si: 8.0 to 12.5 mass%, Cu: 1.0 to 5.0 mass%, Mg: 0.2 to 1.3 mass%, and the balance being Al and inevitable impurities, an aluminum alloy containing Si: 8.0 to 12.5 mass%, Cu: 1.0 to 5.0 mass%, Mg: 0.2 to 1.3 mass%, Sr: 0.005 to 0.03 mass%, and the balance being Al and inevitable impurities, or an aluminum alloy containing Si: 8.0 to 12.5 mass%, Cu: 1.0 to 5.0 mass%, Mg: 0.2 to 1.3 mass%, Sr: 0.005 to 0.03 mass%, Ni: 0.1 to 2.0 mass%, and the balance being Al and inevitable impurities is adjusted to the above composition ratio.

[0060] (Casting Step)

[0061] Next, a round bar composed of an aluminum alloy is cast using the melted raw material. The casting is preferably performed by continuous casting performed in parallel with the above melting step. The diameter of the round bar of the aluminum alloy is the diameter of the recess 21 of the mold 20A used in the forging step described later, and is formed to a size corresponding to the outer diameter of the flange 2 of the scroll member to be produced. For example, a round bar having a diameter of about 85 to 95 mm is formed.

[0062] (Homogenization Heat Treatment Step)

[0063] The homogenization heat treatment step can be performed on the round bar obtained by the casting step. In the homogenization heat treatment step, segregation of added elements generated at the time of casting is eliminated to homogenize the composition, and in addition, a supersaturated solid solution generated by solidification at the time of casting is precipitated, and a metastable phase formed by solidification at the time of casting is transformed to an equilibrium phase. The heating temperature in the homogenization heat treatment is, for example, in the range of 420°C or higher and 500°C or lower.

[0064] (Skinning Step)

[0065] Before the cutting process, aluminum alloy round bars formed by casting can also undergo surface cutting by peeling. Peeling improves the diameter accuracy of the billet and also enhances the surface condition of the outer periphery.

[0066] (Cutting process)

[0067] Next, the round bar is cut to obtain a forging blank. During the cutting process, the forging blank is lubricated with a carbon compound, and the lubricated blank is cut to a specified thickness. During the cutting process, the entire surface of the forging blank is lubricated with a carbon compound.

[0068] As a carbon compound, oily cutting agents such as mineral oil and vegetable oil can be used. Both water-soluble and non-water-soluble cutting oils can be used as carbon compounds. For example, carbon compounds that do not contain graphite can be used.

[0069] (Forging process)

[0070] Next, the forging billet obtained from the cutting process is forged without upsetting. The forging process is, for example, performed after the cutting process, with the carbon compound applied during the cutting process remaining on the surface of the forging billet. Therefore, the forging billet is lubricated by the carbon compound during the forging process. That is, the forging process is performed on a forging billet with the carbon compound on its surface. The forging process is performed, for example, during the period before the carbon compound used to lubricate the forging billet, which is applied to the entire surface of the forging billet including the cut surface, evaporates. The forging process is performed, for example, within one month of the cutting process.

[0071] Forging process can use Figure 3 It is carried out using the device shown. Figure 3 This is a schematic diagram illustrating the forging process in a method for manufacturing a vortex component according to one aspect of the present invention. Figure 4 This is a schematic diagram illustrating the forging process in a method for manufacturing a vortex member according to one aspect of the present invention. Figure 3 A diagram showing the subsequent state. Figure 3 and Figure 4 The figure shows a cross-section of the forging blank 10, the die 20A, and the punch 15. Although the labels are omitted in the figure, as described above, the surface of the forging blank 10 has carbon compounds.

[0072] like Figure 3As shown, the forging step is performed by pressing the forging blank 10 using the die 20A and the punch 15. The die 20A is formed, for example, of a die alloy such as chromium-molybdenum steel, chromium-molybdenum-vanadium steel, or the like, as a whole. The die 20A is formed, for example, with a recessed portion 21 recessed toward the depth direction perpendicular to the upper surface 20a, and a die space 22A extending from the bottom surface 21a of the recessed portion 21 toward the depth direction. The die space 22A penetrates the die 20B in the depth direction of the recessed portion 21.

[0073] The recessed portion 21 receives, for example, a circular-plate-shaped forging blank 10 at the time of forging. The recessed portion 21 is formed so as to match the shape of the flange 2 (see FIG. 1) of the scroll member 1 to be forged, and can be formed in any inner surface shape such as a quadrangular cylindrical shape, in addition to the cylindrical shape of the present embodiment. Figure 1

[0074] The die space 22A is formed in a scroll shape imitating the shape of the blade portion 3 of the forged scroll member 1.

[0075] The ejector rod 30 is inserted, for example, into the die space 22A of the die 20A. The ejector rod 30 has a back pressure plate 31, a ejector pin 32 extending in a direction orthogonal to the back pressure plate 31, and an ejector piece 33 provided to the tip end of the ejector pin 32. The ejector rod 30 is connected, for example, to a back pressure device (not shown) and is configured so as to be able to apply a back pressure. The ejector pin 32 and the ejector piece 33 are formed in a scroll shape imitating the shape of the blade portion 3 of the forged scroll member 1. The ejector rod 30 is provided so as to be able to move in the depth direction of the die space 22A of the die 20A at the time of forging. The height hi of the blade portion 3 of the scroll member 1 is determined according to the position of the ejector rod 30 at the end of the forging step.

[0076] The die 20A and the ejector piece 33 are lubricated by a liquid lubricant in which graphite is mixed in water or mineral oil. The die 20A and the ejector piece 33 are sprayed, for example, by direct spraying, so that the surfaces are lubricated.

[0077] At the start of the forging step, the ejector pin is inserted in advance to the vicinity of the upper end of the die space 22A Figure 3 The upper end of the die space 22A is at the same height as the bottom surface 21a of the recessed portion 21.

[0078] During the process in which the press-in of the forging blank is started by the punch 15 and the forging blank 10 flows into the die space 22A to grow as a blade, the pressure in the direction opposite to the direction in which the forging blank 10 is pressed by the punch 15, which is applied by the back pressure device, is applied to the tip end of the blade by the back pressure plate 31, the ejector pin 32, and the ejector piece 33, so that the blade grows uniformly. In Figure 3 and Figure 4 ​In the middle, the direction in which the forging blank 10 is pressed by the punch 15 and the direction in which the back pressure is applied to the forging blank 10 by the ejector rod 30 are shown by arrows.

[0079] At the time of forging, the metal flow to the die space 22A can be made more uniform by applying the back pressure. If the metal flow to the die space 22A can be made uniform, the uniformity of the height of the blade portion 3 can be improved. The surface pressure to the tip end of the blade portion 3 is, for example, 40 to 120 N / mm 2 , preferably 60 to 100 N / mm 2 , under a certain back pressure.

[0080] In addition, the back pressure to the tip end of the blade portion applied by the ejector rod 30 can be constant or can change over time from the initial back pressure. The back pressure to the tip end of the blade portion can be maintained at the initial back pressure (Pfull) until the length of the blade portion becomes a prescribed length, and after the length of the blade portion becomes the prescribed length, the back pressure can be made lower over time. The end back pressure at the end of the forging process can be set to be smaller than half of the initial back pressure (Pfull). By making the back pressure change in such a manner that it becomes smaller over time as described above, the inflow of the metal to the blade portion being pulled can be suppressed so that the filling rate of the recess 21 is not deteriorated. At this time, the end pressure at the end of the forging process is set to be lower than the deformation stress of the forging blank 10. The deformation stress is a stress in the direction of the blade portion formation direction toward the stress direction of the die space 22A, and if the back pressure is lower than the deformation stress, the workpiece flowing to the blade formation portion is not deformed by the back pressure, and as a result, the molding precision of the blade portion is improved. Specifically, 40 to 120 N / mm 2 , preferably 60 to 100 N / mm 2 , are appropriate.

[0081] The depth d of the surface of the tip piece 33 on the side of the recess 21 from the bottom surface 21a of the recess 21 at the end of the forging process corresponds to the height hi of the blade portion 3 of the scroll member 1 formed. The depth d is, for example, 40 mm or less, preferably less than 30 mm, more preferably 25 mm or less, and further preferably 20 mm or less.

[0082] The above-described forging process can be performed by hot forging or cold forging, for example. The heating temperature of the forging blank 10 in the hot forging is, for example, in the range of 350°C or higher and 450°C or lower.

[0083] During forging, sometimes the unlubricated portion of the blade portion 3 is partially exposed during its formation. However, by keeping the depth d within a certain range, excessive enlargement of the blade portion 3 can be prevented, thus suppressing the exposure of the unlubricated portion. This prevents the formed blade portion 3 from contacting the mold 20A and causing thermal adhesion if the unlubricated portion is exposed.

[0084] (Solution treatment process), (Aging treatment process)

[0085] As described above, the vortex member 1, which has blades 3 of a specified height, is preferably subjected to solution treatment and aging treatment to improve its strength and wear resistance. Solution treatment and aging treatment involve heating at a specified temperature, followed by quenching, and then holding at another specified temperature for a specified time. For example, the solution treatment temperature is preferably 490~500°C. After water quenching, age hardening can be achieved by selecting appropriate conditions of 160~210°C (preferably 170~190°C) and 1~8 hours (preferably 3~6 hours), resulting in a forging with a sufficient hardness of approximately HRB70~85.

[0086] Furthermore, the heat-treated forgings can be assembled into compressors and the like as vortex components 1, mainly by precision machining of the height h1 and shape of the blade section 3.

[0087] The above-described method for manufacturing vortex components can be used to manufacture, for example... Figure 2 The vortex component 1 shown.

[0088] According to the manufacturing method of the vortex component of this embodiment, it is possible to avoid performing the following steps: Figure 7 The conventional method described herein employs a hot forging process and a forging billet lubrication process, and suppresses the generation of thermal adhesion to manufacture the vortex member 1. Therefore, the vortex member manufacturing method according to this embodiment provides a method for manufacturing vortex members that achieves low cost and shortens the manufacturing period.

[0089] In the manufacturing method of the scroll member of the present embodiment, the upsetting step is not performed after the cutting step, and the forging step is performed. Therefore, the carbon compound used for lubrication of the round bar in the cutting step does not volatilize before the forging step, and the forging material can not be lubricated separately. It has been conventionally considered that different materials need to be used as lubricants for lubrication of the forging material and lubrication of the round bar. Specifically, it has been considered that, in the forging step, since the forging material and the die are both composed of metal, from the viewpoint of preventing thermal sticking, a lubricant containing graphite not contained in cutting oil needs to be used. However, by the height of the formed blade portion 3 being in the above-described range, even in the case where the forging step is performed without re-lubricating the forging material at the forging step, but with the carbon compound used in the cutting step coated on the forging material, generation of lubrication interruption can be suppressed, and generation of thermal sticking can be suppressed.

[0090] Further, the present application is not necessarily limited to the above-described embodiments, and various modifications can be applied within a range not departing from the gist of the present application. For example, a forging step using a die as shown in FIGS. 17A and 17B can be performed. Figure 5 and Figure 6

[0091] Figure 5 is a schematic view of the forging step in the manufacturing method of the scroll member of the modification of Figure 3 Figure 6 is a schematic view of the forging step in the manufacturing method of the scroll member of one embodiment of the present application, and is a view showing a state after Figure 5 Figure 5 and Figure 6 cross sections of the forging material 10, the die 20B, the punch 15, and the like are shown.

[0092] Figure 5 The die 20B shown in FIGS. 17A and 17B is provided with a groove portion 22Ba instead of the die space 22A, and is different from the die 20A shown in FIGS. 16A and 16B in this point. In FIGS. 17A and 17B, the same components as the die 20A are denoted by the same reference numerals, and the explanation is omitted. Figure 3 Figure 4 Figure 5 Figure 6

[0093] ​​​​​​​The groove portion 22Ba is formed in a scroll groove shape that imitates the shape of the blade portion 3 of the forged scroll member 1. In the mold 20B, the majority of the area of the groove portion 22Ba is different from the mold space 22A, and does not penetrate in the depth direction of the recess portion 21, and one end is occluded. That is, the groove portion 22Ba of the mold 20B has a bottom portion 22b in the depth direction of the recess portion 21. The depth d from the bottom surface 21a of the recess portion 21 to the bottom portion of the groove portion 22Ba becomes the height h1 of the blade portion 3 of the molded scroll member 1. The depth d from the bottom surface 21a of the recess portion 21 to the groove portion 22Ba is, for example, 40 mm or less, preferably less than 30 mm, more preferably 25 mm or less, and further preferably 20 mm or less.

[0094] As described above, the groove portion 22Ba of the mold 20B includes an occluded bottom portion, and does not load back pressure when the forging process is performed.

[0095] On the other hand, the groove portion 22Ba is provided with a hole portion 22Bb at a portion thereof, and the hole portion 22Bb is inserted with a pin member (ejector pin) 32 for pushing out and taking out the forged scroll member. The hole portion 22Bb is configured so that the largest diameter thereof is smaller than the diameter of the groove portion 22Ba. In addition, in the Figure 5 and Figure 6 In the above, the diameter of the hole portion 22Bb is shown to be larger than the diameter of the pin member 32 for convenience of explanation, but it is preferable that the diameter of the hole portion 22Bb be tapered within a range in which the forged product can be pushed out by the pin member 32, that is, the diameter of the pin member 32 be the same as the diameter of the hole portion 22Bb. In addition, in the forging process, the tip end of the pin member 32 can be aligned with the bottom surface of the groove portion 22Ba, or can be positioned at a position lower than the bottom surface of the groove portion 22Ba.

[0096] The forging process using the mold 20B can be performed under the condition that the mold 20B is lubricated. The lubricant for lubrication of the mold 20B can be the same lubricant as the carbon compound that can be used for lubrication of the mold 20A.

[0097] Even in the case of performing the forging process using the mold 20B, the forged billet obtained by cutting in the cutting process is forged without being upset. The forging process is, for example, a process that is performed next after the cutting process, and is performed in a state in which the carbon compound applied in the cutting process remains on the surface of the forged billet.

[0098] Even in the case of using the mold 20B, the forged billet obtained by cutting in the cutting process is forged without being upset. Figure 5 and Figure 6The mold 20B having the groove portion 22Ba with one end closed as shown can manufacture the scroll member while suppressing generation of thermal sticking, without the upsetting working process and the lubrication process for the forging stock, in the case where the forging is performed without upsetting the forging stock composed of an aluminum alloy. Thus, according to the present application, it is possible to provide a manufacturing method of a scroll member that can achieve cost reduction and shortening of the manufacturing period. Further, the manufacturing method of the scroll member of the above-described embodiment, in the case where Sr, Ca, Na, and Sb are not intentionally added in the melting process and the casting process, these elements are also treated as unavoidable impurities. The total amount of the unavoidable impurity elements in the aluminum alloy is preferably 0.5 mass% or less.

[0099] Further, the present application is not necessarily limited to the above-described embodiment, and various modifications can be applied within the scope of the gist of the present application.

[0100] For example, the upper limit value and / or the lower limit value of the numerical range described in the present specification can be arbitrarily combined to define a preferable range. For example, the upper limit value and the lower limit value of the numerical range can be arbitrarily combined to define a preferable range, the upper limit values of the numerical range can be arbitrarily combined with each other to define a preferable range, and the lower limit values of the numerical range can be arbitrarily combined with each other to define a preferable range.

[0101] In addition, it should be understood that throughout the entire present disclosure, the singular forms "a," "an," and "the" include the plural forms unless the context clearly dictates otherwise. Thus, it should be understood that the singular forms "a," "an," and "the" include the plural forms unless the context clearly dictates otherwise.

[0102] Industrial Applicability

[0103] According to the manufacturing method of the scroll member of the above-described embodiment, the forging process can be performed in a state lubricated with a carbon compound used in cutting of the forging stock, and thus the upsetting process requiring handling in a high-temperature environment and the lubrication process for the forging stock can be omitted. Therefore, the working hours until the scroll member is manufactured, the cost spent for the manufacturing, and the period required for the manufacturing can be greatly suppressed.

[0104] Explanation of Reference Numerals

[0105] 1 Scroll member

[0106] 2 Flange

[0107] 2a One surface

[0108] 3 Blade portion

[0109] 10 Forging stock

[0110] 15 punch

[0111] 20a upper surface

[0112] 20A, 20B mold

[0113] 21 recess

[0114] 21a bottom surface

[0115] 22A mold space

[0116] 22Ba groove portion

[0117] 22Bb hole portion

[0118] 30 ejector rod

[0119] 31 back pressure plate

[0120] 32 ejector pin

[0121] 33 top piece

Claims

1. A method for manufacturing a vortex component, comprising a forging process of forging a forging billet made of aluminum alloy without upsetting.

2. The method for manufacturing a vortex component according to claim 1, comprising: The casting process involves casting round bars made of an aluminum alloy containing 8.0-12.5% ​​by mass of Si, 1.0-5.0% by mass of Cu, and 0.2-1.3% by mass of Mg, with the balance being Al and unavoidable impurities. The cutting process involves cutting the round bar into forging blanks. and The forging process involves placing the forging billet in a die and forging it. During the cutting process, the round bar is lubricated with a carbon compound. In the forging process, the forging billet is lubricated by the carbon compound.

3. The method for manufacturing a vortex component according to claim 1, comprising: The casting process involves casting round bars made of an aluminum alloy containing Si: 8.0~12.5% ​​by mass, Cu: 1.0~5.0% by mass, Mg: 0.2~1.3% by mass, Sr: 0.005~0.03% by mass, with the balance being Al and unavoidable impurities. The cutting process involves cutting the round bar into forging blanks. and The forging process involves placing the forging billet in a die and forging it. During the cutting process, the round bar is lubricated with a carbon compound. In the forging process, the forging billet is lubricated by the carbon compound.

4. The method for manufacturing a vortex component according to claim 1, comprising: The casting process involves casting round bars made of an aluminum alloy containing Si: 8.0~12.5% ​​by mass, Cu: 1.0~5.0% by mass, Mg: 0.2~1.3% by mass, Ni: 0.1~2.0% by mass, with the balance being Al and unavoidable impurities. The cutting process involves cutting the round bar into forging blanks. and The forging process involves placing the forging billet in a die and forging it. During the cutting process, the round bar is lubricated with a carbon compound. In the forging process, the forging billet is lubricated by the carbon compound.

5. The method for manufacturing the vortex component according to any one of claims 2 to 4, The carbon compound is an oily cutting agent.

6. The method for manufacturing the vortex component according to any one of claims 2 to 4 or 3, The forging process is performed after the cutting process.

7. The method for manufacturing the vortex component according to any one of claims 2 to 4, In the forging process, the forging billet having the carbon compound on its surface is forged.

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