JP2015058434A - Forged and molded article, forging and molding method, and forging and molding equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase bonding strength in a forged and molded article in which a plurality of metallic materials are joined together while being molded.SOLUTION: A forged and molded article 10 is molded by plastically deforming a plurality of metallic materials 13A and 13B with the same material properties by pressurization and bringing joint surfaces 14A and 14B of the plurality of metallic materials 13A and 13B into intimate contact with each other by pressurization. In a pressurization step, the joint surfaces 14A and 14B are joined together in a state in which an oxide film is removed.

Description

  The present invention relates to a forged product, a forging method, and a forging device.

  Patent Document 1 discloses a technique for obtaining a forged molded product having a desired shape by combining two metal materials having different shapes and subjecting them to processing by cold forging. In this way, if a method for performing cold forging by combining a plurality of metal materials having different shapes is used, the number of press processes and forging dies in the forging process can be reduced compared to the case of forging one metal material. can do.

JP2013-136068A

In Patent Document 1, one of two metal materials has a bottomed cylindrical shape, and the other metal material is fitted inside the bottomed cylindrical metal material. Thus, the two metal materials are kept in an integrated state from before the forging process to after the forging process. In this way, when two metal materials are fitted together and integrated by a mechanical locking structure, the bonding strength between the two metal materials is low.
This invention is completed based on the above situations, Comprising: It aims at raising joint strength in the forge molded product joined while shape | molding a several metal raw material.

The forged molded product of the first invention is
A forged molded article formed by plastically deforming a plurality of metal materials having the same material by pressurization and bringing the joint surfaces of the plurality of metal materials into close contact by pressurization,
The pressurizing step is characterized in that the joining surfaces are joined with the oxide film removed.

The forging method of the second invention is
A forging method in which a plurality of metal materials having the same material are plastically deformed by pressurization, and a forged molded product is formed by bringing the joint surfaces of the plurality of metal materials into close contact by pressurization,
Prior to the pressing step, the oxide film on the joint surface is removed,
The pressurizing step is characterized in that the joining surfaces in a state where the oxide film is removed are joined together.

The forging and forming apparatus of the third invention is
A plurality of metal materials of the same material are plastically deformed by pressurization, and a part of the metal material is stretched away from the joint surface by pressurization to form an extension portion, and the plurality of metal materials A forging apparatus that forms a forged product by joining the joining surfaces in a state where the oxide film has been removed by pressing,
It is characterized in that a stopper is provided for abutting the extension direction tip in the extension part.

  According to the first and second inventions, in the pressurizing step, the joining surfaces of the plurality of metal materials that are in close contact with each other are pressed with the oxide film removed, so that the joining surfaces are firmly joined together. Is done. Therefore, a forged molded article having excellent bonding strength can be obtained.

  According to the third invention, in the pressurizing step, the joining surfaces of the plurality of metal materials that are in close contact with each other are pressed with the oxide film removed, so that the joining surfaces are firmly joined together. Therefore, a forged molded article having excellent bonding strength can be obtained. In addition, the reaction force generated by causing the distal end of the extension portion in the extension direction to abut against the stopper increases the pressure applied to the joint surface, so that the joint strength of the joint surface becomes higher.

Sectional drawing showing the state which set the metal raw material to the die | dye in the forge forming apparatus of Example 1. Cross-sectional view showing the state where metal materials are joined and formed by punching pressure Cross section of a forged product Graph showing the relationship between the length of elapsed time from the removal of the oxide film on the metal material to the joining of the metal material and the joining state of the metal material Sectional drawing showing the state which set the metal raw material to the die | dye in the forge forming apparatus of Example 2. A plan view showing the metal material set on the die Cross-sectional view showing the state where metal materials are joined and formed by punching pressure Cross section of a forged product Graph showing the relationship between the length of elapsed time from the removal of the oxide film on the metal material to the joining of the metal material and the joining state of the metal material Sectional drawing of the forge molded product of Example 3 Cross-sectional view of the metal material that constitutes the forged product Sectional drawing of the metal material of Example 4

  (1) A forged molded product according to a first aspect of the present invention has an extended portion formed by being deformed so that a part of the metal material extends in a direction away from the joint surface in the pressing step, The extension direction front-end | tip in an extension part may be abutted against the stopper of a forge molding apparatus. According to this configuration, the reaction force generated when the distal end of the extension portion in the extension direction hits the stopper increases the pressure applied to the joint surface, so that the joint strength of the joint surface becomes higher.

  (2) In the forging method according to the second aspect of the present invention, an extension portion is formed by deforming a part of the metal material so as to extend away from the joint surface in the pressurizing step, and the extension in the extension portion is formed. The tip of the direction may be abutted against the stopper of the forging apparatus. According to this configuration, the reaction force generated by abutting the distal end of the extension portion in the extension direction against the stopper increases the pressure applied to the joint surface, so that the joint strength of the joint surface becomes higher.

<Example 1>
Embodiment 1 of the present invention will be described below with reference to FIGS. As shown in FIG. 3, the forged molded product 10 of the first embodiment has a bottomed cylindrical shape, and has a circular bottom plate portion 11 and an upper side from the outer peripheral edge of the bottom plate portion 11 (perpendicular to the plate surface of the bottom plate portion 11). And a cylindrical portion 12 rising in the direction). As shown in FIGS. 1 and 2, the forged molded product 10 is manufactured as a single part by a forging apparatus 20 using a first metal material 13A and a second metal material 13B. The first metal material 13A and the second metal material 13B have a disk shape, and the thickness thereof is the same. The outer diameter of both metal materials 13A and 13B is the same as the outer diameter of the forged product 10. Both metal materials 13A and 13B are made of an aluminum alloy having the same composition.

  As shown in FIGS. 1 and 2, the forging apparatus 20 includes a die 21 and a punch 23. The die 21 has a molding space 22 whose upper surface is open. The forming space 22 has a cylindrical shape with the axis line directed in the vertical direction, and the inner diameter dimension is the same as the outer diameter of the forged molded product 10 and the outer diameters of the two metal materials 13A and 13B. The punch 23 is provided so as to be movable relative to the die 21 in the vertical direction. The punch 23 has a cylindrical shape coaxial with the molding space 22. The outer diameter of the punch 23 is smaller than the inner diameter of the molding space 22 and has the same dimension as the inner diameter of the cylindrical portion 12 of the forged molded product 10. The punch 23 enters the molding space 22 at a high speed while descending while maintaining a coaxial positional relationship with the molding space 22.

  Next, the manufacturing process of the forged molded product 10 will be described. An unillustrated oxide film (aluminum oxide) is formed on the entire surface of both metal materials 13A and 13B before production. Since this oxide film causes a decrease in bonding strength at the bonding surfaces 14A and 14B of both metal materials 13A and 13B described later, it is removed prior to the pressurizing (forging) step. As a removing method, there is a method of immersing the metal materials 13A and 13B in a known oxide film removing solution. Moreover, in order to prevent the reproduction | regeneration of an oxide film, you may apply | coat a rust preventive material to the whole surface of metal raw material 13A, 13B.

  After removing the oxide film, first, the second metal material 13B is accommodated so as to be dropped into the molding space 22, and then the first metal material 13A is accommodated so as to be dropped into the molding space 22. Accordingly, the second metal material 13B is placed on the bottom surface of the molding space 22, and the outer peripheral surface of the second metal material 13B is in contact with the lower end portion of the inner peripheral surface of the molding space 22 in a surface contact state or It will be in the state which opposes a little clearance. The flat upper surface of the second metal material 13B functions as the second bonding surface 14B. Further, the first metal material 13A is placed on the upper surface of the second metal material 13B, and the outer peripheral surface of the first metal material 13A abuts against the lower end portion of the inner peripheral surface of the molding space 22 in a surface contact state. Alternatively, they face each other with a slight clearance. The flat lower surface of the first metal material 13A functions as the first bonding surface 14A. The first joint surface 14A abuts against the second joint surface 14B in a contact state.

  After setting both the metal materials 13A and 13B in the forming space 22 in this way, the punch 23 is lowered into the forming space 22 at a high speed coaxially with both the metal materials 13A and 13B, and the upper surface of the first metal material 13A. A large circular area excluding the outer peripheral edge is strongly pressed. By punching with the punch 23, the region excluding the outer peripheral edge portion of both the metal materials 13 </ b> A and 13 </ b> B is pressed in the vertical direction between the lower end surface of the punch 23 and the bottom surface of the forming space 22. The direction of this pressurization is parallel to the direction in which the joint surfaces 14A and 14B meet and is perpendicular to the joint surfaces 14A and 14B. Further, the pressurization by the punch 23 is performed in a room temperature environment, that is, cold without heating both the metal materials 13A and 13B.

  By pressurizing the punch 23, the second metal material 13B is plastically deformed so that the plate thickness is reduced over a wide range excluding the outer peripheral edge portion, and the diameter is expanded radially outward. The outer peripheral edge rises slightly along the inner peripheral surface of the molding space 22. At the same time, the first metal material 13A is also crushed so as to be thin as a whole by pressurization of the punch 23, and is plastically deformed so as to expand radially outward, and its outer peripheral edge is formed. It rises greatly along the inner peripheral surface of the space 22. As described above, the bottom plate portion 11 and the cylindrical portion 12 are formed by plastically deforming both the metal materials 13A and 13B by shocking pressing of the punch 23. The bottom plate portion 11 is constituted by a majority of the second metal material 13B and a substantially half region of the first metal material 13A. The cylindrical portion 12 is configured by a part of the second metal material 13B and a substantially half region of the first metal material 13A.

  Further, by pressing the punch 23, the two metal materials 13A and 13B are joined and integrated by bringing the joining surfaces 14A and 14B into close contact with each other. Here, since both the joining surfaces 14A and 14B are in close contact with each other in a state where the oxide film that causes a reduction in joining strength is removed, they are joined firmly. After removing the oxide film of the metal materials 13A and 13B, the oxide film starts to be formed again immediately after the removal, and the film thickness of the oxide film increases as the elapsed time after the removal becomes longer.

  The graph of FIG. 4 shows the elapsed time (that is, the thickness of the oxide film to be regenerated) from when the oxide film is removed to when both the bonded surfaces 14A and 14B are pressed by the punch 23, and the state of the bonded surfaces 14A and 14B. Represents the relationship. In this graph, “◯” in Samples 1 and 2 indicates that the joining surfaces 14A and 14B are joined by pressurization of the punch 23, and both the metal materials 13A and 13B are integrated. "Indicates that the metal surfaces 13A and 13B are separated without joining the joining surfaces 14A and 14B even when pressed by the punch 23. Therefore, according to this graph, when the elapsed time from the removal of the oxide film to the pressurization is short (for example, shorter than 50 seconds), the joining surfaces 14A and 14B are joined, but the elapsed time is long. (For example, when it is longer than 130 seconds), it is understood that the bonding surfaces 14A and 14B are not bonded.

  Further, since the joining direction of the joining surfaces 14A and 14B is substantially parallel to the striking direction (pressing direction) by the punch 23, the striking force of the punch 23 is effective as a joining force to the joining surfaces 14A and 14B directly. In this respect, the bonding strength is high. Moreover, since both the joining surfaces 14A and 14B are flat surfaces and are pressed in a contact state, this point is also considered to contribute to the high joining strength.

  As described above, the forged molded product 10 of the first embodiment plastically deforms two metal materials 13A and 13B made of the same material by pressurization, and also joins the joint surfaces 14A and 14B of both metal materials 13A and 13B. It is shape | molded by making it closely_contact | adhere by pressurization. Prior to the pressurizing step, the oxide film that causes a decrease in bonding strength is removed from the bonding surfaces 14A and 14B, and in the pressing step, the bonding surfaces 14A and 14B in a state where the oxide film is removed. They are joined together. Therefore, the joining strength of the two metal materials constituting the forged molded product 10 is excellent.

<Example 2>
Next, a second embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 8, the forged molded product 30 of the second embodiment has a bottomed cylindrical shape, similar to the forged molded product 10 of the first embodiment, and has a circular bottom plate portion 31 and an outer peripheral edge of the bottom plate portion 31. It is comprised from the cylindrical part 32 (extension part as described in a claim) which stands | starts up (direction orthogonal to the plate surface of the baseplate part 31). As shown in FIGS. 5 and 6, the forged product 30 is manufactured as a single part by the forging device 40 using a pair of metal materials 33 having the same shape and dimensions.

  The metal material 33 is a plate having a semicircular planar shape and a constant thickness dimension. As shown in FIG. 6, the outer peripheral surface of the metal material 33 is composed of a semicircular arc surface 34 and a flat joint surface 35 that is continuous at substantially right angles to both ends in the circumferential direction of the semicircular arc surface. The radius of curvature of the semicircular arc surface 34 is set to be smaller than the radius of curvature of the outer peripheral surface of the forged product 30. The material of the metal material 33 is made of the same aluminum alloy as that of the metal materials 13A and 13B of the first embodiment.

  As shown in FIGS. 5 to 7, the forging apparatus 40 includes a die 41 and a punch 43. The die 41 has a molding space 42 whose upper surface is open. The molding space 42 has a cylindrical shape whose axis is directed in the vertical direction. The inner diameter of the molding space 42 is the same as the outer diameter of the forged molded product 30. The depth dimension in the vertical direction (axial direction) of the molding space 42 is set to the same dimension as the height of the forged molded product 30.

  The punch 43 is provided so as to be able to move relative to the die 41 in the vertical direction. The punch 43 is composed of a molding part 44 and a receiving part 45 connected to the upper end of the molding part 44, and the molding part 44 protrudes downward from the lower end surface (surface facing the molding space 42) of the receiving part 45. It has become. The molding portion 44 has a cylindrical shape that is coaxial with the molding space 42. The outer diameter of the molding part 44 is smaller than the inner diameter of the molding space 42 and has the same dimensions as the inner diameter of the cylindrical part 32 of the forged molded product 30. The dimension in the axial direction of the molded part 44 is set to a dimension obtained by subtracting the thickness dimension of the bottom plate part 31 from the height dimension of the forged molded product 30.

  The receiving part 45 has a cylindrical shape coaxial with the forming part 44. The outer diameter of the receiving part 45 is set to be larger than the outer diameter of the molding part 44 and the inner diameter of the molding space 42. As shown in FIGS. 5 and 7, an annular region surrounding the molding portion 44 in the lower end surface of the receiving portion 45 is a stopper 46 perpendicular to the axis of the punch 43. When the punch 43 is lowered, the molding portion 44 enters the molding space 42 at a high speed while maintaining a coaxial positional relationship with the molding space 42. Further, the lowermost position of the punch 43 is a position where the stopper 46 contacts the upper surface of the die 41.

  Next, the manufacturing process of the forged molded product 30 will be described. An unillustrated oxide film (aluminum oxide) is formed on the entire surface of both metal materials 33 before manufacture. Since this oxide film causes a decrease in bonding strength at the bonding surface 35 of both metal materials 33 described later, it is removed prior to the pressurization (forging) step. As a removing method, there is a method of immersing the metal material 33 in a well-known oxide film removing solution. Further, a rust preventive material may be applied to the entire surface of the metal material 33 in order to prevent the regeneration of the oxide film.

  After removing the oxide film, the pair of metal materials 33 are accommodated so as to be dropped and placed on the bottom surface of the molding space 42. At this time, as shown in FIG. 6, the joint surfaces 35 of the two metal materials 33 are opposed to each other with a space therebetween in parallel, and the central portion in the circumferential direction of the semicircular arc surface 34 of the two metal materials 33 is formed. It abuts on the inner peripheral surface of the space 42.

  After setting both the metal materials 33 in the forming space 42 in this way, the punch 43 is lowered to lower the forming portion 44 into the forming space 42 at a high speed coaxially with both the metal materials 33, and both the metal materials 33. A large semicircular range excluding the edge along the semicircular arc surface 34 is strongly pressed. By being struck by the forming portion 44, the portions of both metal materials 33 excluding the edge region along the semicircular arc surface 34 are vertically moved between the lower end surface of the forming portion 44 and the bottom surface of the forming space 42. Pressurized in the direction. The direction of this pressurization is a direction perpendicular to the direction in which both joint surfaces 35 face each other, and is a direction parallel to both joint surfaces 35. Further, the pressurization by the punch 43 is performed in a normal temperature environment, that is, cold without heating both the metal materials 33.

  By pressurizing the punch 43, the region of the metal material 33 that contacts the lower end surface of the forming portion 44 is crushed so as to reduce the plate thickness. Along with this crushing deformation, the joint surfaces 35 approach each other and tightly adhere to each other, and both the metal materials 33 extend so that the gap between the inner peripheral surface of the molding space 42 and the outer peripheral surface of the molding portion 44 rises upward. The extended portion hits the stopper 46 over the entire circumference. Further, both end portions in the length direction of the joint surface 35 extend upward between the outer peripheral surface of the molding portion 44 and the inner peripheral surface of the molding space 42. As described above, both the metal materials 33 are plastically deformed symmetrically by the impact pressure of the punch 43, whereby the bottom plate portion 31 and the cylindrical portion 32 are formed.

  Further, the two metal materials 33 are bonded and integrated by bringing the bonding surfaces 35 into close contact with each other by pressurization of the punch 43. Here, since both the bonding surfaces 35 are in close contact with each other in a state where the oxide film that causes a decrease in bonding strength is removed, they are firmly bonded. After the oxide film of the metal material 33 is removed, the oxide film starts to be formed again immediately after the removal, and the film thickness of the oxide film increases as the elapsed time after the removal increases.

  The graph of FIG. 9 shows the relationship between the elapsed time from the removal of the oxide film to pressurization of both joint surfaces 35 with the punch 43 (that is, the thickness of the oxide film to be regenerated) and the state of the joint surface 35. Represents. In this graph, “◯” in samples 1 and 2 indicates that the joining surface 35 is joined by pressurization of the punch 43 and the two metal materials 33 are integrated, and “x” in samples 3 and 4 indicates the punch. Even if it presses with 43, it shows that both the metal raw materials 33 isolate | separated, without the joining surface 35 joining. Therefore, according to this graph, when the elapsed time from the removal of the oxide film to the pressurization is short (for example, shorter than 50 seconds), the bonding surface 35 is bonded, but when the elapsed time is long (for example, When it is longer than 130 seconds), it can be seen that the bonding surface 35 was not bonded.

  As described above, in the forged molded product 30 of the second embodiment, two metal materials 33 of the same material are plastically deformed by pressurization, and the joint surfaces 35 of both metal materials 33 are brought into close contact by pressurization. It is molded by Prior to the pressurizing step, the oxide film that causes a reduction in bonding strength is removed from the bonding surface 35, and in the pressurizing step, the bonding surfaces 35 with the oxide film removed are bonded together. ing. Therefore, the bonding strength of the two metal materials 33 constituting the forged molded product 30 is excellent.

  In the second embodiment, since the joining direction of the joining surface 35 is perpendicular to the striking direction (pressing direction) by the punch 43, the transmission efficiency of the striking pressure from the punch 43 to the joining surface 35 is the embodiment. Lower than 1. However, in the second embodiment, the forged molded product 30 is formed by being deformed so that a part of the metal material 33 extends in a direction away from the region constituting the bottom plate portion 31 in the joining surface 35 in the pressing step. In view of having the cylindrical portion 32, the distal end surface (upper end surface) in the extending direction of the cylindrical portion 32 is abutted against the stopper 46 of the forging device 40. According to this configuration, the reaction force generated when the front end surface in the extending direction of the cylindrical portion 32 abuts against the stopper 46 enhances the pressure applied to the region constituting the bottom plate portion 31 in the bonding surface 35. The bonding strength of is higher.

<Example 3>
Next, a third embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 10, the forged molded product 50 of the third embodiment has a center hole 51 having a circular cross section penetrating in the axial direction, and is coaxial with the center hole 51 and has a plurality of different outer diameter dimensions. This is a form in which outer peripheral portions 52A, 52B, 52C, and 52D having a circular cross section are arranged in the axial direction. This forged molded product is formed using three metal materials 53, 54 and 55 having different shapes as shown in FIG.

  The first metal material 53 has a cylindrical shape, and the circular first hollow portion 56 constitutes the center hole 51 of the forged product. Of the both end faces in the axial direction of the first metal material 53, the lower end face is a first joining face 57. The second metal material 54 has a disk shape. The inner diameter of the second hollow portion 58 forming the circular shape of the second metal material 54 is set to the same dimension as the inner diameter of the first hollow portion 56. The second hollow portion 58 constitutes the center hole 51 together with the first hollow portion 56. The outer diameter dimension of the second metal material 54 is set to be larger than the outer diameter of the first metal material 53. An annular region surrounding the second hollow portion 58 in the upper surface of the second hollow portion 58 is a second upper joint surface 59 that faces the first joint surface 57. An annular region surrounding the second hollow portion 58 in the lower surface of the second hollow portion 58 is a second lower joint surface 60.

  The third metal material 55 has a disk shape. The inner diameter dimension of the third hollow portion 61 forming the circular shape of the third metal material 55 is set to the same dimension as the inner diameters of the first hollow portion 56 and the second hollow portion 58. The third hollow portion 61 constitutes the center hole 51 together with the first hollow portion 56 and the second hollow portion 58. The outer diameter of the third metal material 55 is set to be larger than the outer diameter of the first metal material 53 but smaller than the outer diameter of the second metal material 54. An annular region surrounding the third hollow portion 61 in the upper surface of the third hollow portion 61 is a third joint surface 62 that faces the second lower joint surface 60.

  When the forged product 50 is manufactured, three metal materials 53, 54, and 55 are set on a die (not shown) of a forging device (not shown). At this time, the second metal material 54 is placed coaxially on the upper surface of the third metal material 55, and the first metal material 53 is placed coaxially on the upper surface of the second metal material 54. From this state, by pressing the three metal materials 53, 54, 55 with a punch (not shown) of the forging apparatus, these metal materials 53, 54, 55 are pressed, The second upper bonding surface 59 is bonded in close contact, and the second lower bonding surface 60 and the third bonding surface 62 are bonded in close contact. At the same time, the three metal materials 53, 54, 55 are plastically deformed. In the production of this forged product, the structure of the forging devices 20 and 40 of Example 1 and Example 2 can be applied and used.

<Example 4>
Next, a fourth embodiment embodying the present invention will be described with reference to FIG. In the fourth embodiment, by using the first metal material 71 and the second metal material 72, the forged molded product 50 having the same shape as that of the third embodiment is manufactured.

  The first metal material 71 has a cylindrical shape, and the hollow portion 73 serves as the center hole 51 of the forged product 50. A substantially central portion in the axial direction of the outer peripheral surface of the first metal material 71 is a first joint surface 74. The second metal material 72 has an annular shape. The inner diameter dimension of the second metal material 72 is set larger than the outer diameter dimension of the first metal material 71, and the dimension of the second metal material 72 in the axial direction is shorter than the dimension of the first metal material 71 in the axial direction. Set to dimensions. The entire area of the inner peripheral surface of the second metal material 72 is a second bonding surface 75.

  When the forged product 50 is manufactured, both metal materials 71 and 72 are set on a die (not shown) of a forging device (not shown). At this time, the first metal material 71 and the second metal material 72 are arranged coaxially, and the first joint surface 74 and the second joint surface 75 are opposed to each other in the radial direction. From this state, both metal materials 71 and 72 are pressed with a punch (not shown) of a forging apparatus to pressurize both metal materials 71 and 72 so that the joining surfaces 74 and 75 are brought into close contact with each other. At the same time, both metal materials 71 and 72 are plastically deformed. In the production of the forged product 50, the structure of the forging devices 20 and 40 of the first and second embodiments can be applied.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In Examples 1 and 2, the metal material is an aluminum alloy, but the metal material may be a material other than the aluminum alloy.
(2) In Examples 1 and 2 described above, the metal material is pressure-formed by cold forging, but the present invention can also be applied to hot forging.
(3) In the first and second embodiments, the two bonding surfaces are flat surfaces, but at least one of the two bonding surfaces may be a curved surface or an uneven surface.
(4) In Examples 1 and 2 above, the oxide film was removed in the entire region of the surface of the metal material prior to the forging (pressing) step, but the region where the oxide film was removed was only the region where they were joined together. It may be limited.
(5) In Example 1 described above, the joining direction of the joining surface is a direction substantially parallel to the punching pressure direction. However, in addition to the joining surface, the metal material is in a direction intersecting the punching pressure direction. It may have a joint surface to be joined.
(6) In Example 2 above, the joining direction of the joining surface is a direction substantially perpendicular to the punching pressure direction, but the metal material is a direction substantially parallel to the punching pressure direction in addition to this joining surface. It may also have a joint surface joined to each other and a joint surface joined in an oblique direction with respect to the punching pressure direction.
(7) In Example 2, the dice were set so that the flat joining surfaces face each other in parallel before pressing, but the dice were set so that the flat joining surfaces face each other diagonally. May be.
(8) In the second embodiment, the stopper is provided only on the die, but the stopper may be provided on both the die and the punch, or may be provided only on the punch.
(9) In the second embodiment, only one of the two metal materials partially extends and comes into contact with the stopper. However, both of the two metal materials partially expand and stop. You may make it contact | abut.
(10) The structure in which the forging device of Example 2 is provided with a stopper can be applied to the forging device of Example 1.

10 ... Forged molded product 13A ... 1st metal material (metal material)
13B ... Second metal material (metal material)
14A ... 1st joint surface (joint surface)
14B ... Second joint surface (joint surface)
30, 50 ... Forged product 32 ... Cylindrical part (extension part)
33 ... Metal material 35 ... Joining surface 40 ... Forging apparatus 46 ... Stopper 53, 71 ... First metal material 54, 72 ... Second metal material 55 ... Third metal material 57, 74 ... First joining surface (joint surface)
59 ... Second upper joint surface (joint surface)
60 ... Second lower joint surface (joint surface)
62 ... Third joint surface (joint surface)
75 ... Second joint surface (joint surface)

Claims (5)

A forged molded article formed by plastically deforming a plurality of metal materials having the same material by pressurization and bringing the joint surfaces of the plurality of metal materials into close contact by pressurization,
In the pressurizing step, the forged molded product is characterized in that the joining surfaces are joined with the oxide film removed. In the pressurizing step, it has an extended portion formed by deforming so that a part of the metal material extends in a direction away from the joint surface,
The forged molded product according to claim 1, wherein an end of the extending portion in the extending direction is abutted against a stopper of the forging apparatus. A forging method in which a plurality of metal materials having the same material are plastically deformed by pressurization, and a forged molded product is formed by bringing the joint surfaces of the plurality of metal materials into close contact by pressurization,
Prior to the pressing step, the oxide film on the joint surface is removed,
In the pressurizing step, the forging method is characterized by joining the joining surfaces in a state where the oxide film is removed. Forming a stretched portion by deforming a part of the metal material in a pressurizing step so as to stretch in a direction away from the joint surface;
The forging method according to claim 3, wherein a tip in the extension direction of the extension portion is abutted against a stopper of a forging device. A plurality of metal materials of the same material are plastically deformed by pressurization, and a part of the metal material is stretched away from the joint surface by pressurization to form an extension portion, and the plurality of metal materials A forging apparatus that forms a forged product by joining the joining surfaces in a state where the oxide film has been removed by pressing,
A forging apparatus characterized by comprising a stopper for abutting the extension direction tip of the extension part.

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