CN216138043U - Cast product and forging device - Google Patents

Abstract

The problem to be solved by this novel is to provide a cast product and forging apparatus, which minimizes the reduction of the forming accuracy caused by the punching of the excess material portion. In order to solve the above problems, there are provided a cast product and a forging apparatus, the cast product being an intermediate molding material required for obtaining a forged product by performing a forging process, the cast product having a concave portion of a shape and a size on a front surface side portion thereof, and a convex portion of a shape and a size corresponding to the shape and the size of the concave portion on a rear surface side portion thereof, and being divided into a predetermined portion to be left after the forging process and a predetermined portion to be separated after the forging process, with the concave portion as a boundary.

Description

Cast product and forging device

Technical Field

The present invention relates to a forging method, a cast product, and a forging apparatus.

Background

A technique has been proposed in which a process of partially forging a cast product and a deburring process are performed simultaneously to simplify the entire cast product manufacturing process (see, for example, patent document 1). Further, there is provided a technique capable of securing the forming accuracy of a forged product even when a discard portion of a cast product, which is an intermediate molding material in an intermediate step, is punched out in a final step (for example, see patent document 2).

[ Prior Art document ]

(patent document)

Patent document 1: japanese laid-open patent publication No. 2006-150430

Patent document 2: japanese laid-open patent publication No. 7-171653

SUMMERY OF THE UTILITY MODEL

[ problems to be solved by the novel ]

In the technique of patent document 1, a cast product is partially forged by a convex portion provided on a cavity inner surface of a pair of upper and lower die mating surfaces having a blade portion at an edge portion and a burr is sheared and removed by the blade portion. A device may be used as one process to simultaneously perform the localized strengthening and burr removal processes of the cast product. On the other hand, in the technique of patent document 2, when forming a shaft gear having a cylindrical shaft portion, the shaft portion cast in the first step is set in a half-punched state to leave a bottom discard portion, and finish forming of the tooth portion and punching of the bottom discard portion are simultaneously performed in the second step. Since the half-punched portion can be punched with a small processing load, a large stress is not generated and the forming accuracy of the shaft-equipped gear can be ensured.

However, in the technique of patent document 1, a reduction in the forming accuracy of the forged product caused when the burr is sheared is not considered. Further, in the technique of patent document 2, in addition to a special technique that requires the shaft portion to be half-punched at a time, it is undeniable that the forming accuracy is also lowered due to stress generated at the time of punching.

The present invention aims to provide a forging method, a forged product, and a forging apparatus, which can minimize the reduction of the forming precision caused by the stamping of a surplus material portion.

[ means for solving problems ]

(1) A forging method, comprising: a casting step (e.g., a casting step described later) of obtaining, by casting, a specific intermediate molding material (e.g., an intermediate molding material described later) having a concave portion (e.g., a concave portion described later) of a specific shape and size at a specific portion on a front surface side, and a convex portion (e.g., a convex portion described later) of a shape and size corresponding to the shape and size of the concave portion at a position corresponding to the concave portion on a back surface side; and a forging step (e.g., a forging step described later) of arranging the intermediate molding material between a pair of dies (e.g., a pair of dies described later) and performing a forging process on the intermediate molding material by overlapping the pair of dies with each other to obtain a forged product (e.g., a forged product described later), one of the pair of dies (e.g., one die described later) having a blade portion (e.g., a blade portion described later); wherein in the forging step, the concave portion of the intermediate molding material is pressed by the blade portion of the one die, and at least the pressed portion is cut.

(2) The forging method according to (1), wherein in the forging step, the other die paired with the one die has a blade receiving portion (e.g., a blade receiving portion described later) that allows at least a part of the blade portion to enter a portion corresponding to the blade portion of the one die, and the intermediate molding material is arranged such that the convex portion is locked by the blade receiving portion.

(3) The forging method according to (1) or (2), wherein in the casting step, the intermediate molding material subjected to the forging process has a predetermined remaining portion (e.g., a predetermined remaining portion) remaining after the forging process and a predetermined releasing portion (e.g., a predetermined releasing portion) releasing after the forging process, with the recessed portion as a boundary, and at least a part of the predetermined remaining portion has an inclined portion (e.g., an inclined portion) that is inclined and raised with respect to the predetermined releasing portion.

(4) The forging method as recited in any one of (1) to (3), wherein in the casting step, the intermediate molded material is formed so that a depth dimension of the concave portion and a height dimension of the convex portion are equal to each other.

(5) The forging method as recited in any one of (1) to (4), wherein in the casting step, the intermediate formed material is formed such that a width dimension of the concave portion is set larger than a thickness dimension of the blade portion of the one die.

(6) A cast product is an intermediate molding material (for example, an intermediate molding material described later) required for obtaining a forged product (for example, a forged product described later) by performing a specific forging process, and has a concave portion (for example, a concave portion described later) having a specific shape and size at a specific portion on a front surface side, and a convex portion (for example, a convex portion described later) having a shape and size corresponding to the shape and size of the concave portion at a position corresponding to the concave portion on a back surface side, and is divided into a predetermined remaining portion (for example, a predetermined remaining portion described later) remaining after the forging process and a predetermined releasing portion (for example, a predetermined releasing portion described later) releasing after the forging process, with the concave portion as a boundary.

(7) A forging apparatus (for example, a forging apparatus described later) comprising a pair of dies (for example, a die described later) constituting a cavity (for example, a cavity described later) in which an intermediate molding material (for example, an intermediate molding material described later) is disposed, the intermediate molding material being forged by being superposed on each other, the pair of dies having a blade portion (for example, a blade portion described later) protruding into the cavity, the pair of dies having a blade receiving portion (for example, a blade receiving portion described later) allowing at least a part of the blade portion to enter a portion corresponding to the blade portion of the pair of dies, the pair of dies having a predetermined portion (for example, a to-be-left-portion to be described later) and a portion supporting a to-be-separated portion (for example, a to-be-separated portion to be described later) of the intermediate molding material, which is separated after the forging process, at least a part of the portion supporting the to-be-left-portion being inclined with respect to the portion supporting the to-be-separated portion.

Advantageous effects

In the forging method of (1), while the shear stress is generally dispersed around the blade portion of one die when shearing the intermediate formed material, the dispersion of the shear stress is suppressed by transmitting the shear force from the blade portion to the concave portion and the convex portion of the intermediate formed material in a concentrated manner. In addition, the blade portion is pressed toward the concave portion, so that the position deviation of the intermediate molding material in the cavity is suppressed. This improves the accuracy of the processing position for pressing the intermediate molding material, and improves the yield of forged products.

In the forging method of (2), the positional shift of the cast product can be further suppressed by increasing the position of the positioning of the intermediate molding material in the pair of dies.

In the forging method of (3), at the time of pressing the separation scheduled portion, the displacement of the intermediate molding material in the surface direction in the cavity of the pair of dies can be suppressed, and the effect of improving the yield of the forged product obtained by the forging process accompanied by the pressing can be further enhanced.

In the forging method of (4), the forming accuracy of the intermediate formed material is secured, and as a result, the quality of the forged product obtained by the forging process is good. This is because, if the concave portion of the intermediate molding material is deep, the thickness of the plate becomes thin, so that the molten metal does not spread in the mold during casting, and on the other hand, even if the convex portion of the intermediate molding material is large, the thickness of the plate increases, and the flow of the molten metal is disturbed, thereby deteriorating the casting quality.

In the forging method of (5), when the blade portion of one die is pressed to the recess of the intermediate molding material, the contact portion of the blade portion can be received by the recess. This can further suppress the dispersion of the shear stress at the blade portion, and can minimize the reduction in forming accuracy at the time of separating from the portion to be pressed.

In the cast product of (6), that is, the intermediate formed material, in general, stress is dispersed around the blade portion when the intermediate formed material is sheared, however, the stress dispersion of the die is suppressed by transmitting the shearing force from the blade portion to the concave portion and the convex portion in a concentrated manner. In addition, the blade portion is pressed toward the concave portion, so that the position deviation of the intermediate molding material in the cavity is suppressed. This can improve the accuracy of the processing position for pressing the intermediate molding material, and can improve the yield of forged products.

In the forging apparatus as recited in (7), when the pressing operation is performed by the blade portion of one die, the intermediate molding material can be prevented from being displaced in the surface direction in the cavities of the pair of dies, and the yield of the forged product obtained by the forging process accompanied by the pressing can be improved.

Drawings

Fig. 1 is a process diagram illustrating a forging method according to an embodiment of the present invention.

Fig. 2 is a view showing an intermediate molding material obtained in the casting process in fig. 1.

Fig. 3 is a view showing a forged product obtained in the forging process in fig. 1.

Fig. 4 is a view showing a die of the forging apparatus used in the forging step in fig. 1.

Fig. 5 is a view showing another die of the forging apparatus used in the forging step in fig. 1.

Fig. 6 is a diagram illustrating an operation of the forging apparatus applied to the forging step in fig. 1 in an initial stage.

Fig. 7 is a diagram illustrating an operation of the forging apparatus applied to the forging step in fig. 1 at an intermediate stage.

Fig. 8 is a diagram illustrating the operation of the forging apparatus applied to the forging step in fig. 1 at the final stage.

Fig. 9 is a conceptual sectional view illustrating the operation and effect of the forging step in fig. 1.

Fig. 10 is a partially enlarged view of fig. 9.

Fig. 11 is a conceptual sectional view illustrating the operation and effect of a normal forging process.

Fig. 12 is a partially enlarged view of fig. 11.

Reference numerals

S1 casting step

S3 forging Process

1 intermediate Molding Material

2 forged products (knuckle)

3 foot part

4 bearing part

5 header

6 stamping part

7 forging device

8 Upper die (one pressing die)

9 lower die (another pressing die)

10 blade part

11 blade receiving part

13 chamber

14 concave part

15 convex part

16 remaining scheduled portion

17 to be detached

18 an inclined portion.

Detailed Description

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

Fig. 1 is a process diagram illustrating a forging method according to an embodiment of the present invention.

The forging method according to an embodiment of the present invention includes a casting step S1 of obtaining the intermediate molding material 1 of fig. 2 and a forging step S3 of obtaining the forged product 2 of fig. 3. The cast product as the intermediate molding material obtained in the casting process S1 is conveyed (S2), and a forging process S3 is performed. An example of a cast product as an intermediate molding material is shown in fig. 2, and the article in a state of being completed as a forged product illustrated in fig. 3 is an automobile part. More specifically, the present invention relates to a knuckle applied to a front wheel suspension mechanism of an automobile.

In the casting process S1, a specific intermediate molding material 1 is obtained, the specific intermediate molding material 1 having a concave portion of a specific shape and size on a specific portion of the front surface side, and a convex portion of a shape and size corresponding to the shape and size of the concave portion on the back surface side at a position corresponding to the concave portion. The concave and convex peripheries of the intermediate molding material 1 will be described later. The intermediate molding material 1 is conveyed (S2), and a forging process S3 is performed. In the forging step S3, the intermediate formed material 1 is arranged between a pair of dies, one of which has a blade portion, and the intermediate formed material 1 is forged by overlapping the pair of dies with each other, and the pressed portion is sheared by pressing the concave portion of the intermediate formed material with the blade portion of the one die with respect to the intermediate formed material 1. The description about the cutting is made later with reference to the drawings.

The knuckle 2, which is the intermediate molding material 1 and the forged product of fig. 2 and 3, has a foot portion 3, which is a base end portion having a relatively wide width, a bearing portion 4 adjacent to the foot portion 3, and a head portion 5 extending from the bearing portion 4 in a direction opposite to the foot portion 3. A press-formed part 6, which is a vacant space for press-forming a blank part, is formed in a central part where rigidity contribution is low at a bent part connected from the bearing part 4 to the nose part 5, thereby achieving weight reduction as an automobile part. Further, forging processing is performed on all portions of the intermediate molding material 1 (knuckle 2) that are left with portions corresponding to the stamped-out portions 6.

Fig. 4 is a view showing one die of the forging apparatus 7, that is, the upper die 8, applied in the forging process S3. Fig. 4 is a view of one surface on which the intermediate molding material 1 is disposed, as viewed from above. Fig. 5 is a view showing another die of the forging apparatus 7, that is, the lower die 9, applied in the forging process S3. Fig. 5 is a view of one surface on which the intermediate molding material 1 is disposed, as viewed from above. A blade 10 is formed on the upper die 8 at a portion corresponding to the inner peripheral edge of the punch 6 in fig. 3, and the blade 10 protrudes forward in a convex shape in a direction perpendicular to the paper surface in fig. 4. As shown in fig. 4, the blade 10 is annularly connected along the inner periphery of the punch 6 of fig. 3 and has a constant thickness. Further, a blade receiving portion 11 is formed on the lower die 9, and the blade receiving portion 11 allows at least a part of the blade portion 10 of the upper die 8 to enter. The blade receiving part 11 is formed in a concave recessed shape corresponding to the convex protruding shape of the blade part 10. As shown in fig. 5, the blade receiving portion 11 is annularly connected to the shape of the blade portion 10, and has a width dimension (opening interval of a concave shape) corresponding to the thickness of the blade portion 10.

Fig. 6, 7, and 8 are views for explaining the operation of the forging apparatus 7 applied in the forging step S3 in fig. 1. Fig. 6 shows an operation in an initial stage, fig. 7 shows an operation in an intermediate stage, and fig. 8 shows an operation in a final stage. Fig. 6, 7, and 8 collectively describe the operation of the forging apparatus 7, and the shapes of the respective portions do not necessarily match the shapes of fig. 3 to 5, but the same reference numerals are given to the corresponding portions. In fig. 6, 7 and 8, the intermediate molding material 1 is disposed in a cavity 13 formed by overlapping the upper mold 8 and the lower mold 9. The concave portion 14 of the intermediate molding material 1 corresponds to the blade portion 10 of the upper die 8, and the convex portion 15 of the intermediate molding material 1 is disposed at a position corresponding to the blade receiving portion 11 of the lower die 9. The intermediate molding material 1 is divided into a remaining portion 16 remaining after the forging process and a portion 17 to be separated, with the convex portion 15 as a boundary.

Fig. 6 shows a state where the intermediate molding material 1 is placed in the cavity of the lower mold 9 when the upper mold 8 and the lower mold 9 are separated. From this state, the upper die 8 is lowered in the direction indicated by the arrow line. When the intermediate molding material 1 is placed in the cavity of the lower mold 9, the convex portion 15 protruding toward the back surface side of the intermediate molding material 1, that is, the side facing the cavity of the lower mold 9 is positioned so as to be fitted into the empty space of the blade receiving portion 11 of the lower mold 9 to some extent. By the positioning, the position of the blade portion 10 of the upper die 8 matches the position of the concave portion 14 on the front surface side of the intermediate molding material 1.

As shown in fig. 6, fig. 7 shows a state in which the tip of the blade portion 10 of the upper die 8 is lowered to a position in contact with the bottom of the concave portion 14 of the intermediate molding material 1 in a state in which the intermediate molding material 1 is positioned and placed on the lower die 9. When the upper die 8 is further lowered by the pressing pressure, as shown in fig. 8, the portions of the concave portion 14 and the convex portion 15 of the intermediate molding material 1 are sheared by the blade portion 10 of the upper die 8, and the portions to be separated 17 are pressed and separated from the portions to be left 16. In the state of fig. 8, the press pressure is applied to all portions except the sheared portion of the intermediate molding material 1 in the cavity 13 and the forging process is performed at once, eliminating the casting defect. At the time of punching the scheduled separation portion 17, the blade portion 10 of the upper die 8 shears the intermediate molded material 1, but if no special measures are taken, the intermediate molded material 1 is undesirably displaced by the stress accompanying the shearing. That is, the molding accuracy of the intermediate molding material 1 is lowered due to the displacement. In contrast, in the case of this example, the molding accuracy of the intermediate molding material 1 is sufficiently ensured. The operational effect of thus ensuring the molding accuracy of the intermediate molding material 1 is described in further detail with reference to fig. 9 to 12.

Fig. 9 is a sectional view conceptually illustrating the operation and effect of the forging step of fig. 6 to 8, and fig. 10 is a partially enlarged view of fig. 9. Fig. 11 is a cross-sectional view conceptually illustrating the operational effect of the normal forging step as compared with fig. 9, and fig. 12 is a partially enlarged view of fig. 11. In fig. 9 to 12, the same reference numerals are given to corresponding parts. Here, the example of fig. 9 and 10 has the concave portion 14 and the convex portion 15 as described above as the intermediate molding material 1, whereas in fig. 11 and 12, the concave portion 14 and the convex portion 15 as described above are not present on the intermediate molding material 1a, and the portion is flat. In fig. 9 to 12, for convenience of explanation, the shape of the intermediate molding material 1 is different from that in fig. 6 to 8.

As shown in fig. 9 and 10, in this example, the intermediate molding material 1 is placed on the cavity of the lower die 9 so that the convex portion 15 thereof fits into and engages with the blade receiving portion 11 of the lower die 9. By this locking, the intermediate molding material 1 is held in a normal position. Further, since the cutting portion 10 of the upper die 8 is cut so as to fit into the concave portion 14 of the intermediate molding material 1, the intermediate molding material 1 is firmly held at the normal position until the portion to be detached 17 is pressed and detached from the portion to be left 16.

On the other hand, as shown in fig. 9 and 10, the intermediate molding material 1 is divided into a remaining portion 16 remaining after the forging process and a detachment portion 17 detached after the forging process, with the recessed portion 14 as a boundary. At least a part of the to-be-left-remaining portion 16 has a shape having an inclined portion 18, and the inclined portion 18 is inclined and raised with respect to the to-be-detached portion 17. Thus, the intermediate molding material 1a of the general example of fig. 11 and 12 is also the same in terms of assuming a shape having the inclined portion 18. That is, at least a part of the planned remaining portion 16 has an inclined portion 18 that rises obliquely with respect to the planned detachment portion 17 from the vicinity of a position of the intermediate molding material 1a corresponding to the position of the recessed portion 14 in fig. 9 and 10.

As will be understood from the description of the intermediate molding material 1 with reference to fig. 9 and 10, the forging apparatus 7 has the following configuration. That is, the lower die 9 has a portion for supporting the remaining scheduled portion 16 remaining after the forging process in the intermediate molding material 1 and a portion for supporting the scheduled detachment portion 17 detached after the forging process in the intermediate molding material 1, with the tooth receiving portion 11 as a boundary, and at least a part of the portion for supporting the remaining scheduled portion 16 is inclined and raised with respect to the portion for supporting the scheduled detachment portion 17.

The intermediate molding materials 1 and 1a are placed in the cavity of the lower mold 9, and at the stage when the blade portion 10 of the upper mold 8 is lowered to the position of contact with the intermediate molding material 1, the inclined portions 18 of the intermediate molding materials 1 and 1a leave a gap with the upper mold 8 when the lower mold 9 is in contact with the back surface. Therefore, in the intermediate molded material 1a of the normal example of fig. 11 and 12, if the blade portion 10 of the upper die 8 further descends and stress starts to act on the abutment portion of the intermediate molded material 1a, the position of the inclined portion 18 is not held at the normal position but is displaced until the predetermined portion 17 is sheared off by the blade portion 10 and pressed. This positional deviation causes a reduction in molding accuracy.

In contrast, in the case of the intermediate molding material 1 shown in fig. 9 and 10, since the convex portion 15 is fitted and locked to the blade receiving portion 11 of the lower die 9, even when the portion to be pressed out 17 is removed, the positional deviation from the normal position can be suppressed. Further, the blade portion 10 of the upper die 8 is displaced toward the recessed portion 14 of the intermediate molding material 1 to be fitted thereto, and therefore, the shear stress is concentrated on the portion. Therefore, shearing is easily performed. If the positional deviation is suppressed by the engagement of the convex portion 15 of the intermediate molding material 1 and the blade receiving portion 11 of the lower die 9, the blade portion 10 of the joining upper die 8 advances and concentrates the shearing force at the portion of the concave portion 14 of the intermediate molding material 1, and the intermediate molding material 1 is held at the normal position during the forging process including the pressing of the detachment planned portion 17. Therefore, the reduction in the forming accuracy due to the pressing of the surplus portion, that is, the portion to be detached 17 is sufficiently suppressed. Therefore, the forged product obtained by such a forging process is excellent in dimensional accuracy.

As a forging apparatus 7 according to an embodiment of the present invention, a specific example of the upper die 8 and the lower die 9 will be described with reference to fig. 4 and 5, and the operation will be described with reference to fig. 6 to 10, and the forging apparatus includes a functional portion required as a forging apparatus in the vicinity of a characteristic portion described with reference to these drawings. Specifically, the die is provided so as to surround the periphery of the upper mold 8 and the lower mold 9. Heaters are disposed between the die and the upper and lower dies 8 and 9. One or more die plates are disposed above the upper die 8 in a manner to be grounded, and a ram is disposed above the die plates, as required. One or more die plates are disposed in contact with the lower side of the lower die 9, and a base is disposed below the die plates, as required. The lower mold 9 is fixed to the base via a template. In this regard, the upper die 8 slides up and down in the die. By this sliding, the upper die 8 and the lower die 9 are separated from each other, and in addition, a cavity is constituted which disposes the intermediate molding material to which the forging process is applied by being overlapped with each other. That is, the upper die 8 and the lower die 9 are paired to constitute the cavity.

Examples of the conditions for the forging process described above by the forging apparatus 7 are as follows. Here, as the intermediate molding material to which the forging process is applied, 6000 series Al-Mg-Si alloy and AC4c series Al-Si-Mg alloy are applied. The heating temperature of the casting material (the intermediate molding material) is 300 to 540 ℃, the temperature of the forging die (the upper die 8 and the lower die 9) is 200 to 300 ℃, the pressing pressure is 1000 to 1500 tons, and finish forging is performed only once.

According to the forging method, the cast product, and the forging apparatus of the present embodiment, the following effects are obtained.

In the forging method of (1), while the intermediate formed material 1 is sheared, generally, the stress is dispersed around the blade portion 10 of the upper die 8, but the dispersion of the shearing stress is suppressed by transmitting the shearing force from the blade portion 10 to the concave portion 14 and the convex portion 15 of the intermediate formed material 1 in a concentrated manner. Further, the blade 10 is pressed toward the recess 14, thereby suppressing the positional deviation of the intermediate molding material 1 in the cavity 13. This can improve the accuracy of the processing position for pressing the intermediate molding material 1, and can improve the yield of the forged product 2.

In the forging method of (2), by increasing the position of the positioning of the intermediate molding material 1 in the pair of dies of the upper die 8 and the lower die 9, the positional deviation of the cast product, that is, the intermediate molding material 1 can be further suppressed.

In the forging method of (3), when the scheduled press-off portion 17 is pressed, the displacement of the intermediate molding material 1 in the surface direction in the cavities 13 of the pair of dies of the upper die 8 and the lower die 9 can be suppressed, and the effect of improving the yield of the forged product 2 obtained by the forging process accompanied by the pressing can be further enhanced.

In the forging method of (4), the forming accuracy of the intermediate formed material 1 is ensured, with the result that the quality of the forged product 2 obtained through the forging process is good. This is because, if the concave portion 14 of the intermediate molding material 1 is deep, the thickness of the plate becomes thin, so that the molten metal does not spread in the mold at the time of casting, and on the other hand, even if the convex portion 15 of the intermediate molding material 1 is large, the thickness of the plate increases, and the flow of the molten metal is disturbed, resulting in a reduction in casting quality, however, by setting the shape and size of the concave portion 14 of the intermediate molding material 1 to correspond to the shape and size of the convex portion 15, the flow of the molten metal is aligned, and the casting quality of the intermediate molding material is improved.

In the forging method of (5), when the blade portion 10 of the upper die 8 is pressed against the recessed portion 14 of the intermediate molding material 1, the contact portion of the blade portion 10 can be received by the recessed portion 14. This can further suppress the dispersion of the shear stress by the blade portion 10, and can minimize the reduction in the forming accuracy at the time of press-separating from the scheduled portion 17.

In the cast product of (6), that is, the intermediate molded material 1, in shearing the intermediate molded material 1, generally, stress is dispersed around the blade portion 10, but the stress dispersion of the die is suppressed by transmitting the shearing force from the blade portion 10 to the concave portion 14 and the convex portion 15 of the intermediate molded material 1 in a concentrated manner. Further, the blade 10 is pressed against the recess 14, thereby suppressing the positional deviation of the intermediate molding material 1 in the cavity 13. This can improve the accuracy of the processing position for pressing the intermediate molding material 1, and can improve the yield of the forged product 2.

In the forging apparatus 7 of (7), when the pressing operation is performed by the blade portion 10 of the upper die 8, the displacement of the intermediate molding material 1 in the surface direction in the cavities of the pair of dies of the upper die 8 and the lower die 9 can be suppressed, and the yield of the forged product 2 obtained by the forging process accompanied by the pressing can be improved.

The present invention is not limited to the above embodiments, but may be applied to other embodiments. The detailed structure can be appropriately modified within the scope of the present invention. For example, the forging apparatus may be provided with a robot for collecting the to-be-separated portion to be punched out.

Claims (2)

1. A cast product, which is an intermediate molding material required for obtaining a forged product by performing a forging process, characterized in that a concave portion having a shape and a size is provided at a specific portion on a front surface side, and a convex portion having a shape and a size corresponding to the shape and the size of the concave portion is provided at a position corresponding to the concave portion on a back surface side, and the cast product is divided into a predetermined remaining portion remaining after the forging process and a predetermined breaking portion breaking away after the forging process, with the concave portion as a boundary.

2. A forging apparatus comprising a pair of dies which form a cavity in which an intermediate molding material is disposed, the intermediate molding material being the cast product according to claim 1, the pair of dies being arranged to overlap each other to apply a forging process to the intermediate molding material,

said one die having a blade projecting into said cavity,

the other die has a blade receiving portion for allowing at least a part of the blade portion to enter a portion corresponding to the blade portion of the one die, the other die has a portion for supporting a predetermined remaining portion of the intermediate molding material remaining after the forging process and a portion for supporting a predetermined separating portion of the intermediate molding material separated after the forging process, the other die being limited by the blade receiving portion, and at least a part of the portion for supporting the predetermined remaining portion is inclined and raised with respect to the portion for supporting the predetermined separating portion.

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