JPH08132169A - Forming method of metal formed part having tooth shaped projecting line with tooth lacked region - Google Patents

Abstract

PURPOSE: To suppress the burr near tooth lacked region in the forging method of the gear outer peripheral face having spline with tooth lacked region. CONSTITUTION: A carbon steel shape stock is forcedly pushed into the annular clearance 44 between a die 2 and mandrel 4. A material of shape stock is flowed into a forming line groove 27 of the die 2 and spline is formed. The excess material due to lacked tooth of spline is flowed into a relief groove 47 of the mandrel 4 and an excess stock relief projecting part is formed. Subsequently, the whole inner peripheral part of preformed body including the excess material relief projecting part is cut/removed by a prescribed depth, the preformed body is made to a gear part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding method for molding a metal molded product having tooth-shaped protrusions such as splines and gear teeth having a toothless region. The present invention can be applied to, for example, a gear component used in a vehicle transmission.

[0002]

2. Description of the Related Art Conventionally, for example, a gear component 1 (see FIG. 12) used in a vehicle transmission has been known as a metal molded product having a tooth-shaped protrusion. On the outer peripheral portion of the gear component 1, a large number of splines 14 are arranged in a row at intervals in the circumferential direction. In this gear component 1, a region where the splines 14 are not formed, that is, a toothless region is provided. The toothless region is used for forming an oil hole, for example.

In the case of forging the gear part 1 as described above, as shown schematically in FIG. 13, a cylindrical carbon steel rough shaped material 700 and a die 200 having a die hole 201.
And a mandrel 400 arranged substantially coaxially in the die hole 201 of the die 200. And punch 5
By lowering 50, the die hole 2 of the die 200
The cylindrical rough material 700 is strongly pressed by the punch 550 and pushed into the ring-shaped gap between the inner peripheral portion of 01 and the outer peripheral portion of the mandrel 400.

As a result, the die hole 20 of the die 200 is formed.
In the gap of the molding groove 270 formed in the inner peripheral portion of 1,
The material part of the rough material 700 flows in, and the above-mentioned many splines 14 are molded.

[0005]

However, in the above-mentioned gear component 1, as described above, the spline 14 is used.
There is a toothless region in which no tooth is formed. In such a toothless region, there is no space defined by the molding groove 270. Therefore, when the spline 14 is formed by pushing in as described above, a material corresponding to the missing tooth becomes excessive in the vicinity of the missing tooth region. Therefore, during the above-described pushing operation, the extra material that has lost its place tends to flow in the pushing direction and collect on the rear side to form a burr M as shown in FIG. This burr M is not preferable because it is crushed by the mold surface 200k of the die 200 at the final stage of pushing.

The present invention has been made in view of the above situation, and an object thereof is to provide a method for forming a metal molded product capable of suppressing the generation of burrs in the vicinity of the toothless region of the metal molded product.

[0007]

According to the present invention, there is provided a method for forming a metal molded product having a tooth-shaped protrusion having a toothless region, wherein one of the inner peripheral portion and the outer peripheral portion is circumferentially spaced from one another. A method for obtaining a metal molded product having a large number of tooth-shaped protrusions that extend parallel to the axial direction and has a toothless region where there are no tooth-shaped protrusions at predetermined circumferential positions. Rough shaped material made of metal, a die that includes a die hole and defines the outer peripheral portion of the rough shaped material, and a mandrel that defines the inner peripheral portion of the rough shaped material that is arranged substantially coaxially within the die hole of the die, A forming groove group consisting of a large number of forming grooves formed on one of the inner peripheral portion of the die hole and the outer peripheral portion of the mandrel and extending in the direction parallel to the axial direction to form the tooth-shaped protrusions of the metal molded product. Formed on the other of the inner peripheral part of the die hole and the outer peripheral part of the mandrel, and adjacent to each other in the circumferential direction And a relief groove that is located between the forming groove grooves and that corresponds to the toothless region in the circumferential direction and that is recessed in the direction opposite to the recess direction of the forming groove group in the radial direction. The cylindrical rough shaped material is pressed by a punch into the ring-shaped gap between the inner peripheral portion of the hole and the outer peripheral portion of the mandrel, and the outer and inner peripheral portions of the rough shaped material are pressed by the group of forming grooves. On one side, a large number of tooth-shaped protrusions extending in the direction parallel to the axial direction are formed, and the meat portion of the rough shape material corresponding to the toothless region is caused to flow into the relief groove to form the excess thickness relief protrusion. It is characterized by sequentially performing a pushing step of forming an intermediate molded body having and a removing step of cutting and removing the excess thickness relief projection of the intermediate molded body taken out from the die to obtain a metal molded product. .

[0008]

According to the method of the present invention, in the pushing step, the cylindrical rough material is strongly pressed by the punch into the ring-shaped gap between the inner peripheral portion of the die hole of the die and the outer peripheral portion of the mandrel. Push in. As a result, the material of the rough material flows into the voids defined by the molding groove. Therefore, due to the molding groove,
A large number of tooth-shaped ridges such as splines and gear teeth are formed on one of the outer peripheral portion and the inner peripheral portion of the rough material.

According to the method of the present invention, in the pushing step,
Of the material of the rough material, an excess material portion corresponding to the toothless region flows into the relief groove. The material that has flowed into the escape groove is
Excessive meat becomes a protrusion. As a result, an intermediate compact having the excess thickness relief protrusion is formed. In the removing step, the excess thickness relief projections of the intermediate molded body taken out from the die are cut and removed to form a metal molded product.

[0010]

EXAMPLES Examples of the molding method of the present invention will be specifically described. First, the gear component 1 as a metal molded product will be described with reference to FIG. The gear part 1 is the same as the gear part described in the prior art, is used for an automatic transmission of an automobile, and is made of carbon steel.

As shown in FIG. 12, the gear component 1 includes a tubular body 10, a flange portion 11 extending integrally with the tubular body 10 in the centrifugal direction, and a large-diameter cylinder extending from the flange portion 11 in the axial direction. And a shape body 12. The large-diameter tubular body 12 is coaxial with the tubular body 10 and has a larger diameter than the tubular body 10. In this embodiment, the intermediate molded body 8 serving as the gear component 1 described above is molded. FIG. 1 shows a main part of the intermediate compact 8. Figure 2
Indicates the bottom surface of the intermediate molded body 8. The intermediate molded body 8 has a shape substantially similar to that of the gear component 1. Here, the intermediate molded body 8 includes a large number of splines 14 and a surplus portion relief projection 80 described later. The inner peripheral portion 8i of the intermediate molded body 8 including the excess thickness relief protrusion 80 is cut and removed at a predetermined depth over the entire circumference to obtain the gear component 1.

That is, as shown in FIG. 1, splines 14 as tooth-shaped projections are formed on the outer peripheral portion of the intermediate molded body 8. A large number of splines 14 (a total of 47 teeth including missing teeth; 4 missing teeth) are arranged at intervals along the circumferential direction of the intermediate molded body 8, that is, the direction of arrow R1. As can be understood from FIG. 1, the spline 14 has a substantially trapezoidal cross section, and extends in the axial direction of the intermediate molded body 8 serving as the gear component 1, that is, parallel to the arrow P1 direction. As can be understood from FIG. 1, the spline 14 includes a pair of back facing surfaces 14a facing each other and an outer end surface 14b connecting the back facing surfaces 14a. The back surface 14a is defined by an involute curve, but is not limited to this.

As can be seen from FIG. 1, in the intermediate molded body 8 which becomes the gear component 1, there is a toothless region 16 in which the spline 14 is not formed. That is, in FIG. 2, the spline corresponding to the first reference position indicated by the arrow M1 does not exist, and the toothless region 16 is formed.
The spline corresponding to the second is not present and is the toothless region 16, and the spline corresponding to the 24th spline indicated by the arrow M3 is not present and the toothless region 16 is present, and the spline corresponding to the 35th arrow M4 is indicated. Missing region 16
It has been.

In this gear component 1, the tooth-missing region 1
6 is used in the following form, for example. That is, a proper number of oil holes penetrating in the thickness direction are formed in the toothless region 16. When the gear component 1 is used, the generated centrifugal force causes the working oil to flow in through the oil hole. It is preferable that the spline does not exist in the formation of the oil hole, and in this sense, it is defined as the toothless region 16. However, the missing tooth region 16
The use form of is not limited to this.

In FIG. 1, as the target dimension near the spline 14, the thickness A of the spline 14 in the circumferential direction near the tooth bottom of the spline 14 is 4.81 mm, and the missing tooth region 1
6, the distance B between the tooth bottoms in the circumferential direction is 8.03 mm,
The outer diameter C is 96 mm and the inner diameter E is 83.7 mm. Next, the main part of the forging device used in this embodiment will be described with reference to FIG. In FIG. 3, the die 2 is provided with a die hole 20 in the central region thereof, and defines and restrains the outer peripheral portion of the rough material 7. The die hole 20 is provided with a ring-shaped enlarged diameter recess 22 on the upper surface opening side. The enlarged-diameter recess 22 has a ring-shaped taper surface 22e, a ring-shaped vertical wall surface 22f, and a ring-shaped bottom surface 22k. Further, ring-shaped pressure plates 30 and 31 are arranged on the lower bolster side of the forging device not shown. Has been done. Further, a ring-shaped holder 33 is arranged on the lower bolster side (not shown) of the forging device, and the die 2 is fitted and held in the holder 33. Then, the ring-shaped pressing board 34 is attached to the holder 33 with the bolts 35, so that the die 2 is fixed to the upper surface side of the pressure board 30.

The mandrel 4 has a substantially columnar shape and is arranged substantially coaxially within the die hole 20 of the die 2, and defines and restrains the inner peripheral portion of the rough material 7. A ring-shaped gap 44 including the enlarged diameter recess 22 is formed between the inner peripheral portion of the die hole 20 of the die 2 and the outer peripheral portion of the mandrel 4. The gap 44 serves as a molding cavity for molding the intermediate molded body 8 that becomes the gear component 1.

As shown in FIG. 3, a mandrel 4 and a die 2 are provided.
Between the knock-out sleeve 50 for releasing the mold and the knock-out pin 5 that pushes up the knock-out sleeve 50.
2 are arranged. The knockout pin 52 passes through a pin passage 57 formed in the mandrel 4. Further, a substantially columnar punch 55 functioning as a pressing die is held on the side of the upper and lower voltastor (not shown) of the forging device that can be moved up and down, and further ring-shaped pressing plates 56 and 57 that surround the punch 55 are held. Has been done. A ring-shaped push-in portion 55c is formed at the tip of the punch 55 to partition the recess 55a. As shown in FIG. 3, the concave portion 55a is fitted into the tip portion 4a of the mandrel 4, so that the mutual positioning is performed.

FIG. 4 shows a main portion of the die 2 in which the mandrel 4 is inserted into the die hole 20. As can be understood from FIG. 4, a forming groove group 26 is formed on the inner peripheral portion of the die hole 20 of the die 2. The forming groove group 26 is formed in the inner peripheral portion of the die hole 20 in the circumferential direction, that is, the arrow R1.
A large number of molding grooves 2 formed at predetermined intervals along the direction
It consists of 7. The molding groove 27 is formed by the spline 14 described above.
And is extended in the axial direction of the die 2, that is, in the direction parallel to the arrow P1 direction. The molding groove 27 is
A pair of mold surfaces 27a facing each other and a pair of mold surfaces 27a
And a mold surface 27b for connecting the two.

6 to 8 show the mandrel 4. Figure 6
FIG. 9 is a sectional view taken along line W3-W4-W5 of FIG. Figure 7
FIG. 7 is a view as seen from the direction of arrow W1 in FIG. FIG. 8 is a view as seen from the direction of arrow W2 in FIG. As shown in FIG. 7, a total of four escape grooves 47 are formed in the outer peripheral portion 4x of the mandrel 4 along the circumferential direction at predetermined intervals. As shown in FIG. 6, the escape groove 47 extends along the axial direction of the mandrel 4.

Further, as can be understood from the comparison between FIG. 1 and FIG. 4, the relief groove 47 is positioned so as to face the toothless region 16.
It is arranged between the two molding grooves 27 that are adjacent to each other in the circumferential direction, that is, in the direction of arrow R1. As can be understood from FIG. 4, the escape groove 47 is a pair of groove side surfaces 47 facing each other.
a and 47b, and a groove bottom surface 47c connecting the pair of groove side surfaces 47a and 47b. As shown in FIG.
The direction of the depression of the molding groove 27 is formed in the die 2.
The opposite of the direction of the depression.

FIG. 9 shows a cross section of the main part of the tubular rough-shaped material 7. The rough material 7 is formed by hot forging a steel material (for example, S45C) into a predetermined rough shape in a hot forging process. The rough material 7 includes a rough cylindrical body 70 and a rough cylindrical body 7.
0 and a rough flange portion 71 extending integrally in the centrifugal direction
And a rough large diameter cylindrical body 72 extending in the axial direction from the rough flange portion 71. The rough tubular body 70 corresponds to the tubular body 10 of the gear component 1. The rough flange portion 71 corresponds to the flange portion 11 of the gear component 1, and has a shape similar to the flange portion 11 of the gear component 1,
Has dimensions. The coarse-diameter large-diameter tubular body 72 corresponds to the large-diameter tubular body 12 of the gear component 1, and has a shape and dimensions similar to those of the large-diameter tubular body 12 of the gear component 1.

In FIG. 9, according to the rough material 7, the inner diameter Da of the rough cylindrical body 70 is 83.8 mm, the outer diameter Db of the rough cylindrical body 70 is 100.2 mm, and the large rough diameter cylindrical body 72. Inner diameter D
c is 108 mm, and the outer diameter Dd of the large-diameter cylindrical body 72 is 11
The target value is 8 mm. The inner diameter and the outer diameter mean the diameter. In FIG. 9, in the present embodiment, the large inner diameter D4 of the portion corresponding to the valley of the molding groove 27 of the die 2 is set to a value close to the outer diameter Db of the rough-shaped material 7, that is, 99.78.
It is set to 5 mm. The target value of the inner diameter D5 of the portion corresponding to the crest of the molding groove 27 is 95.786 mm.
The target value of the inner diameter D3 of the vertical surface 22t of the enlarged diameter recess 22 is 118 mm. The outer diameter D6 of the mandrel 4 is set to a value approximate to the inner diameter Da of the rough material 7, and is 83.7 mm.
It has been.

In the pushing step of this embodiment, as shown in FIG. 9, the inner peripheral portion of the die hole 20 of the die 2 and the mandrel 4 are shown.
The rough cylindrical body 70 side of the cylindrical rough shaped material 7 is made to face the ring-shaped gap 44 between the outer peripheral portion and the outer peripheral portion. Then, in this state, an unillustrated forging device is driven to lower the punch 55 in the direction of the arrow Y1 as shown in FIG. Then, the pressing member 55 c of the punch 55 strongly presses the rough material 7, and the rough material 7 is forcedly pushed into the gap 44 between the die 2 and the mandrel 4. In addition, this indenting process
Is carried out in a cold state, which is a room temperature state.

In this pushing step, the material of the rough cylindrical body 70 of the rough shaped material 7 is mainly the molding groove 2 of the die 2.
It flows into the void defined by 7 in the direction of arrow N1 (see FIG. 10). As a result, a large number of splines 14 are formed on the outer peripheral portion of the rough shaped material 7 by the die surfaces 27a and 27b of the forming groove 27. The spline 14 has a shape that is substantially the same as the molding groove 27, and extends in the axial direction, that is, in the direction parallel to the arrow P1 direction (see FIG. 1).

In the present embodiment, since the spline 14 is not formed in the tooth-missing area 16, the material portion of the rough material 7 corresponding to the tooth-missing area 16 becomes an extra portion as described above, and originally the destination is There is no such thing. Therefore, the excess material due to the tooth-missing region 16 is provided in the escape groove 47 of the mandrel 4 (four in total in this embodiment) in the direction of arrow N2 (see FIG.
Flow). As a result, the excess thickness relief projection 80 is formed as shown in FIGS. Therefore, in addition to the splines 14, the ring-shaped intermediate molded body 8 having the excess thickness relief projections 80 (four in total) is formed.

As shown in FIG. 2, in the circumferential direction, that is, in the direction of arrow R1, the excess thickness relief projection 80 and the toothless region 16 are substantially in phase. FIG. 5 shows an enlarged view of the vicinity of the excess thickness relief projection 80. In FIG. 5, imaginary lines T1 and T2 are along the radial direction of the intermediate molded body 8 and virtually connect the roots of the end faces 80h and 80i in the circumferential direction of the excess thickness relief projection 80 and the central axis of the intermediate molded body 8. It is a line. As shown in FIG.
One end surface 80h of the escape protrusion 80 in the circumferential direction (in other words, the groove side surface 47a of the escape groove 47) is positioned inside the virtual line T1 by an angle α. The other end surface 80i (from another perspective, the groove side surface 47 of the escape groove 47)
Similarly, b) is positioned inside the virtual line T2 by an angle β (α = β).

In the present embodiment, the cross-sectional area of the excess thickness relief projection 80 (that is, the cross-sectional area of the relief groove 47) is SA, and the cross-sectional area of the spline 14 (that is, the cross-sectional area of the forming groove 27).
Is SB, the relationship between the two is preferably SB ≦ SA in order to avoid burrs. After forming the intermediate compact 8 as described above, the punch 55 is then moved to the arrow Y2.
In the same direction to disengage from the die 2, and push up the knockout pin 52 to lift the knockout sleeve 5
0 is pushed up, whereby the intermediate molded body 8 is taken out from the die hole 20 of the die 2.

After that, the intermediate compact 8 is set in a cutting machine in order to carry out the removing step. Then, with the cutting tool of the cutting machine, the excess thickness relief projection 80 of the intermediate compact 8 is formed.
Remove by cutting. In this case, the entire inner peripheral portion 8i of the intermediate molded body 8 including the excess thickness relief protrusion 80 may be cut and removed by a predetermined depth. Alternatively, the excess meat relief projection 8
Alternatively, only 0 may be cut and removed. As a result, the gear part 1 having the splines 14 is formed from the intermediate molded body 8.

(Test Example) In the above-mentioned embodiment, the groove width of the relief groove 47 formed in the outer peripheral portion of the mandrel 4 (width dimension of a circular arc in the circumferential direction) is L1 (see FIG. 4), and the groove depth is Was set to K1 (see FIG. 4), L1 and K1 were appropriately changed, and the relationship between them was tested. The test results are shown in FIG.
In FIG. 11, ● means that burrs are generated due to excess thickness,
○ means that no burr is generated due to excess thickness.

In the embodiment of the present invention, as shown in FIG. 11, even if the groove depth K1 is large, when the groove width L1 of the escape groove 47 is small, burrs are generated and the "burr area" is generated. It is easy to become an area. It was also confirmed that even if the groove depth K1 is small, burrs are less likely to occur as the groove width L1 increases, and the burrs move to the "burr-free area". However, if the groove width L1 becomes excessively large, it may be difficult for the material portion that originally flows to the forming groove 27 to form the spline 14 to easily flow to the forming groove 27. In this sense, the groove width L
Making 1 too large is not preferable. Therefore, as shown in FIG. 5, it is preferable to set an interval of ΔL between the end surface 80h of the excess thickness relief projection 80 and the root of the spline 14. Further, if the groove depth K1 becomes excessively large,
Since the material does not flow sufficiently into the escape groove 47, it is not preferable to increase the groove depth K1 excessively.

From these test results, in the form of the spline 14 according to the present embodiment, it is estimated that the groove width L1 of the escape groove 47 is preferably about 6 mm and the groove depth K1 is preferably about 2 mm. (Other Examples) In the above example, the spline 14 is formed on the outer peripheral portion of the intermediate molded body 8 and the excess thickness relief projection 80 is formed on the inner peripheral portion 8i of the intermediate molded body 8. However, the present invention is not limited to this. It is not limited to this, and the reverse form may be used. That is, the splines may be formed on the inner peripheral portion 8i of the intermediate molded body 8 serving as the gear component 1, and the excess thickness relief protrusions may be formed on the outer peripheral portion of the intermediate molded body 8. In this case, the forming groove for forming the spline is formed in the outer peripheral portion 4x of the mandrel 4, and the escape groove having the same phase as the toothless region in the circumferential direction is formed in the inner peripheral portion of the die hole 20 of the die 2. It

In the above-described embodiment, the number of the tooth-missing regions 16 is four, but the number is not limited to this, and the number may be less or more. In the above-described embodiment, the tooth-shaped ridge is applied to the molding of the spline 14, but it may be applied to a shape other than the spline. For example, the tooth-shaped ridges may be applied to gear teeth extending in the axial direction.

It is needless to say that the above-mentioned dimensional relationship is not limited and can be appropriately changed as necessary. Although the above-mentioned example is an example applied to forging, not limited to this, by using a die and a mandrel for extrusion, by extrusion processing of the rough shape material, it can also be applied to an extrusion molding device that forms a spline. it can.

Besides, the present invention is not limited to the embodiments described above and shown in the drawings, and can be appropriately selected as necessary within the scope not departing from the gist.

[0035]

According to the method of the present invention, the material portion of the rough-shaped material corresponding to the tooth-missing area originally has an excess thickness, but the material portion having the excess thickness corresponds to the tooth-missing area. It flows into the relief groove formed at the position. Therefore, it is advantageous in reducing and avoiding that the material portion that becomes the extra thickness becomes a burr. Therefore, it is advantageous for reducing and avoiding scratches caused by burrs.

[Brief description of drawings]

FIG. 1 is a perspective view of the vicinity of a surplus portion relief protrusion of an intermediate molded body that is a gear part.

FIG. 2 is a bottom view of the intermediate molded body.

FIG. 3 is a vertical sectional view of a main part of a forging device.

FIG. 4 is an enlarged perspective view near a clearance groove formed on an outer peripheral portion of a mandrel inserted into a die hole of a die.

FIG. 5 is a configuration diagram of a main part of an intermediate molded body.

6 is a cross-sectional view of the mandrel taken along W3-W4-W5 in FIG.

FIG. 7 is a view of FIG. 6 viewed from the direction of arrow W1.

FIG. 8 is a view of FIG. 6 viewed from a direction of an arrow W2.

FIG. 9 is a cross-sectional view showing a state in which a rough material is positioned above a die.

FIG. 10 is a cross-sectional view showing a state in which a rough material is pushed into a die hole of a die by a punch.

FIG. 11 is a graph showing the relationship between the groove width and the groove depth of the escape groove in the presence or absence of burrs.

FIG. 12 is a perspective view of a gear component including splines showing a state in which a part thereof is cut.

FIG. 13 is a cross-sectional view according to a conventional technique that schematically shows a state in which a rough material is pressed into a die hole of a die by a punch.

FIG. 14 is a configuration diagram according to a conventional technique that schematically shows a crude material having burrs generated when the rough material is pushed into a die hole of a die.

[Explanation of symbols]

In the figure, 1 is a gear part (metal molded product), 14 is a spline (toothed ridge), 16 is a toothless region, 2 is a die, 26 is a group of groove grooves, 27 is a groove groove, 4 is a mandrel, 47 is a relief groove, 55 is a punch, 7 is a rough material, 8 is an intermediate molded body, 80
Indicates a relief portion of the excess meat.

Claims (1)

[Claims] 1. A plurality of tooth-shaped protrusions that are arranged in a row in the circumferential direction at intervals in the inner circumferential portion and the outer circumferential portion and extend parallel to the axial direction, and the teeth are provided at predetermined positions in the circumferential direction. Is a method for obtaining a metal molded product having a toothless region in which there is no protruding ridge, and a cylindrical metal rough shaped material, and a die having a die hole and defining an outer peripheral portion of the rough shaped material, A mandrel that is disposed substantially coaxially within the die hole of the die and defines the inner peripheral portion of the rough shape member, and the mandrel that is formed on one of the inner peripheral portion of the die hole and the outer peripheral portion of the mandrel and that extends in the axial direction. Formed groove group consisting of a large number of formed groove grooves that extend in parallel directions to form the tooth-shaped protrusions on the metal molded product, and are formed on the other of the inner peripheral portion of the die hole and the outer peripheral portion of the mandrel. , The tooth-missing region located in the circumferential direction between the molding grooves adjacent to each other in the circumferential direction Between the inner peripheral portion of the die hole of the die and the outer peripheral portion of the mandrel using a relief groove that is provided in a corresponding phase and that is recessed in the direction opposite to the recess direction of the forming groove group in the radial direction. The cylindrical rough-shaped material is pressed into the ring-shaped gap by a strong pressure with a punch, and by the forming groove group, one of the outer peripheral portion and the inner peripheral portion of the rough-shaped material is parallel to the axial direction. A plurality of tooth-shaped protrusions extending in the same direction are formed, and a material portion of the rough-shaped material corresponding to the toothless region is caused to flow into the escape groove to form an intermediate formed body having a relief escape protrusion. A tooth-like shape having a tooth-missing region, which is characterized in that: a step, a step of cutting and removing the excess thickness relief projections of the intermediate molded body taken out from the die to obtain a metal molded product, A method for forming a metal molded product having a ridge.