JPH09314274A - Forging formation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the surface roughness of a formed product and to reduce the cost of the formed product by giving a blank the force in the approaching direction of punches and the force crossing at the right angle in the approaching direction thereof, at the time of forming the metallic blank in a guide hole by using one pair of punches. SOLUTION: At the time of press-forming a valve lifter 1 by coining the secondary blank W composed of a bottom part Wa and a skirt part Wb, the secondary blank W is inserted into a cavity formed with an upper die 11, lower die 12, upper punch 16 and lower punch 18. Successively, the upper punch 16 is slidingly lowered in the guide hole 13 to press-form the secondary blank W. In this case, the lower punch 18 is slightly lowered accompanying the formation and also, synchronizing with the lowering of the upper punch 16, a pin 19 is slidingly lowered in the pin hole 15 and therefore, the blank is turned around the axis O at 45 deg.C angle by pushing with the pin 19. By this method, even if the force in the approaching direction with each punch 16, 18 is reduced, the formed product having a desirable size can be forged.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a forging method. This method is suitable for molding a bottomed cylindrical component such as a valve lifter or a combustion pressure sensor housing.

[0002]

2. Description of the Related Art As a bottomed cylindrical component, FIG. 13 shows a valve lifter 1 as an example used in a valve mechanism of an internal combustion engine. The valve lifter 1 is molded as follows. That is, first, after cutting a steel bar material, pressing, or punching a steel plate material as a disk-shaped primary rough material, by drawing the primary rough material, ironing, etc., A secondary rough material having a bottom portion and a skirt portion provided upright around the bottom portion is obtained. Then, the secondary rough material is subjected to coining or the like to form a slightly raised valve seat surface 2a in the center of the inside of the bottom portion 2, the skirt portion 3 is further extended, and the top surface 2b outside the bottom portion 2 is formed. Overhang the flange 4 around the valve lifter 1
And

Here, as a manufacturing method for obtaining the secondary rough material from the primary rough material by forging, a die having a guide hole and a die provided so as to be proximate to each other are slidable in the guide hole to form a guide hole. And a forging device provided with a pair of punches for forming a primary rough material together with the punching device.
There is a technique described in Japanese Patent No. 3 publication. Also, as a manufacturing method for obtaining a valve lifter from a secondary rough material by forging as well,
There is a technique described in JP-A-6-179037 using a similar forging device.

The stem end of the valve 5 is brought into contact with the valve seat surface 2a of the valve lifter 1 thus obtained, and the outer shim 6 is fixed in the flange 4 by being brought into contact with the top surface 2b. As a result, this valve lifter 1 is used in an internal combustion engine. At this time, a cam of a cam shaft (not shown) is brought into contact with the outer shim 6. Although not shown, a valve lifter is also known in which an inner shim (not shown) is interposed on the valve seat surface 2a to bring the stem end of the valve 5 into contact. Further, as shown in FIG. 14, there is also known a valve lifter 10 including a bottom portion 8 having a slightly raised valve seat surface 8a at the inner center and a skirt portion 9 provided upright around the bottom portion 8. In this valve lifter 10, no flange is formed around the top surface 8b.

[0005]

However, as in the case of obtaining a valve lifter from a primary rough material or a secondary rough material or a secondary rough material by the above-mentioned conventional forging forming method, it is generally used from a metal rough material. When a molded product is obtained by forging, desired forging cannot be performed unless the force in the proximity direction such as the compression force and coining force due to the proximity of each punch is large. If the force of each punch in the approach direction is large, the reaction force due to the plastic deformation that the rough material imparts to the forging device also becomes large. In this case, in the forging device, since there is unavoidable rattling between the press ram or the like that brings the punches close to each other and the frame that fixes them, the die and the punches of the forging device are slightly deformed elastically except in the vertical direction However, the dimensional accuracy of the molded product deteriorates. For example, when the molded product has a cylindrical portion such as the skirt portion of the valve lifter, at least one of the punches is inclined with respect to the die, the flatness of the top surface is deteriorated, and the uneven thickness of the cylindrical portion is reduced. Increase.

A first object of the present invention is to make it possible to forge a molded product of a desired size even if the force of each punch in the proximity direction is reduced. Further, it has been clarified that when a molded product is obtained by the above-mentioned conventional forging-molding method, the surface roughness of the portion of the molded product that is molded by the punch is almost the same as that of the rough material. This is because the material does not move positively in the portion of the rough material facing the punch. Therefore, for example, in the above valve lifter, the surface roughness of the valve seat surface or the top surface is not sufficient unless the relatively expensive polished steel material is used as the starting rough material (Rz
Higher values) which results in increased friction and increased component wear. Thus, even in a general molded product, it is required to improve the surface roughness (reduce the Rz value) of the portion of the molded product that is molded by the punch and reduce the cost of the molded product.

A second object of the present invention is to achieve both improvement of surface roughness of a portion of a molded product to be molded by a punch and cost reduction of the molded product. Further, it was also clarified that when a molded product is obtained by the above-mentioned conventional forging-molding method, the hardness of the portion of the molded product that is molded by the punch is almost the same as that of the rough material. This is because work hardening does not easily occur in the material in the portion of the rough material facing the punch. Therefore, for example, in the above-mentioned valve lifter, unless the relatively rough steel material is used as the starting rough material, the durability is concerned. If a relatively hard steel material is used as the starting rough material in this way, the force of each punch in the approach direction increases as described above, and the dimensional accuracy of the molded product deteriorates. Thus, even in a general molded product, it is required to improve the hardness of the portion of the molded product that is molded by the punch and to improve the dimensional accuracy of the molded product.

A third object of the present invention is to make it possible to forge a molded product having a desired dimension in which the hardness of the portion molded by the punch is high.

[0009]

[Means for Solving the Problems]

(1) A forging method according to claim 1, wherein a die having a guide hole and a die provided so as to be proximate to each other, at least one of which slides in the guide hole and forms a metal rough material together with the guide hole. Using a forging device equipped with the punch, a molded product is produced by applying a force in the approach direction of each punch and a force in the cross direction intersecting the proximity direction to the rough material arranged in the guide hole. It is characterized in that

In the forging method according to the first aspect, the action and effect of the following second or third aspect can be obtained due to the difference in the timing of applying the force in the approaching direction and the force in the intersecting direction. (2) The forging method according to claim 2 is characterized in that, in the forging method according to claim 1, a force in the approaching direction and a force in the intersecting direction are applied simultaneously. In the forging method according to the second aspect, since the force in the approaching direction and the force in the crossing direction are applied at the same time, desired forging can be performed even with a low force in the approaching direction. This is because it is considered that the force in the intersecting direction assists the movement of the material and microscopically yields the material, so that the rough material is easily deformed even by the force in the lower proximity direction.

For this reason, the rough material gives only a small reaction force to the forging device, and the elastic deformation of the die and the punches hardly occurs, so that the dimensional accuracy of the molded product is improved. Therefore, according to the forging method of the second aspect, it is possible to forge a molded product having a desired size with a small force in the close direction. (3) In the forging method according to claim 3, in the forging method according to claim 1 or 2, after applying a force in a close direction to press the intermediate product, a force in a cross direction is applied to the intermediate product. It is characterized in that a molded product is obtained by

When a molded product is obtained by the forging method according to the third aspect, the convex portion of the material is crushed by the force in the intersecting direction at the portion of the intermediate product pressed by the force in the proximity direction facing the punch, The recess is filled. If the force in the intersecting direction is applied while the force in the approaching direction is applied, the material is positively moved by the force in the intersecting direction at the portion of the rough material facing the punch. In this way, the surface roughness of the portion formed by the punch in the formed product is improved. At this time, since it is not necessary to use a relatively expensive polished steel material as a starting rough material, a molded product can be obtained at low cost.

Therefore, according to the forging-molding method of the third aspect, it is possible to improve the surface roughness of the portion of the molded product to be molded by the punch and to reduce the cost of the molded product. (4) In the forging method according to claim 4, in the forging method according to claim 2 or 3, the force in the intersecting direction is applied by rotating one punch with respect to a rough material or an intermediate product. And

The force in the crossing direction can be applied by vibrating the rough material or the intermediate product with ultrasonic waves or by moving one punch relative to the rough material or the intermediate product. Rotating and applying the material or the intermediate product is simple and has a great effect in the forging device. At this time, the material moves positively in the circumferential direction at the portion of the rough material or the intermediate product facing the punch. For this reason, the molded product thus obtained has a slip mark that can be clearly distinguished from a cutting mark at the portion formed by the punch.

(5) A forging method according to a fifth aspect is the forging method according to the fourth aspect, wherein at least one of the punches has a frictional force increasing means for increasing a frictional force with a rough material or an intermediate product. And When a molded product is obtained by the forging method according to claim 5, since the frictional force increasing means increases the frictional force with the rough material or the intermediate product, the portion of the rough material or the intermediate product facing the punch is twisted. Strain is generated and work hardening occurs in the material there. At this time, since it is not necessary to use a relatively hard steel material as the starting rough material, the force in the approaching direction is relatively small, and the dimensional accuracy of the molded product does not deteriorate.

Therefore, according to the forging method of the fifth aspect, it is possible to forge a molded product having a desired dimension in which the hardness of the portion to be molded by the punch is high.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments 1 to 6 and tests 1 to 4 embodying the invention described in each claim will be described below with reference to the drawings. (First Embodiment) In the first embodiment, claims 1, 2, and 4 are embodied.

First, in order to mold the valve lifter 1 shown in FIG. 13, a steel rod is cut and then pressed, or a steel plate is punched to form a disk-shaped primary rough material. By drawing and ironing the material,
A secondary rough material W having a bottom Wa shown in (left) and a skirt Wb provided upright around the bottom Wa is obtained. Then, a forging device, a part of which is shown in FIG. 1, is used. In this forging device, the upper die 11 and the lower die 12 are attached to a frame (not shown).
Is fixed, and the upper die 11 and the lower die 12 are provided with guide holes 13 having a circular cross section and extending in the vertical direction.
A coaxial large-diameter punched hole 14 having a circular cross section and continuous with the guide hole 13 is provided therethrough. Further, a pin hole 15 that extends in parallel with the guide hole 13 and communicates with the upper surface of the punch hole 14 is also provided in the upper die 11 and the lower die 12.

An upper punch 16 fixed to an upper ram (not shown) is provided above the upper die 11, and the upper punch 16 is vertically slidable in the guide hole 13 by the vertical movement of the upper ram. . A guide hole 13 is provided at the lower end of the upper punch 16.
A small diameter portion 16a having a slightly smaller diameter is formed, and the small diameter portion 16a
At the center of the lower end of the concave portion 16b, a concave portion 16b is formed which is slightly concave.

In the guide hole 13 and the punch hole 14 of the lower die 11, a lower ram (not shown) is mounted rotatably and vertically in a lower ram via a thrust bearing 17 and the like. A small-diameter portion 18a having a diameter slightly smaller than that of the guide hole 13 is also formed at the upper end of the lower punch 18, and a convex portion 18b protruding slightly upward is formed at the center of the upper end of the small-diameter portion 18a.
A cam portion 18d, which slides in the punch hole 14 and has an inclined surface 18c on a part of its upper surface, is formed like a flange at the lower end of the lower punch 18. The lower end of a pin 19 which is coupled to the upper punch 16 and slidable in the pin hole 15 is in contact with the inclined surface 18c of the cam portion 18d.

The secondary rough material W is coined by the forging device configured as described above. First, as shown in FIG. 1 (left), the secondary rough material W is inserted into the cavity formed by the upper die 11, the lower die 12, the upper punch 16 and the lower punch 18. Then, by lowering the upper ram, the upper punch 16 slides down in the guide hole 13. As a result, the secondary rough material W is press-molded into the shape of the valve lifter 1 (see FIG. 13) as shown in FIG. 1 (right). At this time, the lower punch 18 slightly descends as it is formed, and the pin 19 slides down in the pin hole 15 in synchronization with the lowering of the upper punch 16, so that the lower punch 18 is pushed by the pin 19 and 45 °.
Rotate around the axis O.

Thus, in the first embodiment, the upper punch 16
And a shearing force in a direction orthogonal to the coining force due to the rotation of the lower punch 18 are simultaneously applied to the second rough material W. At this time, the portions of the second rough material W that face the upper and lower punches 16 and 18 (the valve seat surface 2a and the top surface 2).
In b), the material actively moves in the circumferential direction. (Second Embodiment) In the second embodiment, claims 1, 3, and 4 are embodied.

First, as in the first embodiment, a secondary rough material W shown in FIG. 2 (left) is obtained. Then, a forging device, a part of which is shown in FIG. 2, is used. Even with this forging device, the upper die 11 and the lower die 1
2, a guide hole 13 having a circular cross section and extending vertically is provided so as to penetrate therethrough. A rack 20 that is in contact with the outer periphery of the guide hole 13 is provided below the lower die 12 so as to be movable left and right. Also,
On the outer periphery of the lower end of the lower punch 18, a tooth groove 18e capable of meshing with the rack 20 is engraved while the lower punch 18 moves up and down from the top dead center to the bottom dead center. Other configurations are the same as in the first embodiment.

The secondary rough material W is coined by the forging device configured as described above. First, as in the first embodiment, the secondary rough material W is inserted into the cavity. Then, by lowering the upper ram, the upper punch 16 slides down in the guide hole 13. At this time, as shown in FIG. 2 (right), the lower punch 18 is slightly lowered as it is formed. Thus, the coining force is applied to the secondary rough material W, and the intermediate product is pressed.

Thereafter, the rack 20 is moved to rotate the lower punch 18 around the axis O of 45 °. In this way, shear force is applied to the intermediate product, and the valve lifter 1 (see FIG.
3) to obtain a molded product. During this time, the upper and lower punches 16 and 1 in the intermediate product pressed by the coining force
8, the convex portion of the material is crushed and the concave portion is filled with the shearing force at the portion (valve seat surface 2a and top surface 2b) facing 8;

It is also possible to lower the upper punch 16 to apply the coining force and at the same time to move the rack 20 to rotate the lower punch 18 to apply the shearing force. (Third Embodiment) In the third embodiment, claims 1, 2, and 4 are embodied.

First, as in the first embodiment, a secondary rough material W shown in FIG. 3 (left) is obtained. Then, a forging device, a part of which is shown in FIG. 3, is used. In this forging device, a guide hole 13 having a circular cross section and extending vertically is formed through the upper die 11 and the lower die 12,
A screw thread 13a is provided on the inner peripheral surface of the guide hole 13 on the lower side. Further, the lower punch 18 is provided with a screw groove 18f capable of engaging with the screw thread 13a. Another configuration is the first embodiment.
Is the same as

The secondary rough material W is coined by the forging device configured as described above. First, as in the first embodiment, the secondary rough material W is inserted into the cavity. Then, by lowering the upper ram, the upper punch 16 slides down in the guide hole 13. As a result, the secondary rough material W is
As shown in (right), the valve lifter 1 (see FIG. 13) is molded. At this time, the lower punch 18 slightly descends as it is formed, and the thread 13a
Along the axis of rotation of 45 ° around the axis O. Thus, the coining force and the shearing force are simultaneously applied to the second rough material W.

Therefore, also in the third embodiment, the same operation and effect as in the first embodiment can be obtained. (Fourth Embodiment) In the fourth embodiment, claims 1, 3, and 4 are embodied. First, as in the first embodiment, the secondary rough material W shown in FIG. 4 (left) is obtained. Then, a forging device, a part of which is shown in FIG. 4, is used. Even with this forging device, the upper die 11 and the lower die 1
2, a guide hole 13 having a circular cross section and extending vertically is provided so as to penetrate therethrough. A cylinder rod 21 is provided below the lower die 12 so as to extend toward the outer periphery of the guide hole 13. Further, a bracket 22 that can abut on the rod 21 is radially projected on the outer periphery of the lower end of the lower punch 18 while the lower punch 18 moves up and down from the top dead center to the bottom dead center.
2 is rotatable in the space formed in the lower die 12. Other configurations are the same as in the first embodiment.

The secondary rough material W is coined by the forging device configured as described above. First, as in the first embodiment, the secondary rough material W is inserted into the cavity. Then, by lowering the upper ram, the upper punch 16 slides down in the guide hole 13. At this time, as shown in FIG. 4 (right), the lower punch 18 descends slightly as it is formed. Thus, the coining force is applied to the secondary rough material W, and the intermediate product is pressed.

Thereafter, the rod 21 is extended to rotate the lower punch 18 around the axis O by 45 °. In this way, shearing force is applied to the intermediate product to obtain a molded product. Therefore, also in the fourth embodiment, the same operation and effect as those in the second embodiment are obtained. (Fifth Embodiment) The fifth embodiment also embodies claims 1, 3, and 4.

First, in order to mold the valve lifter 10 shown in FIG. 14, a secondary rough material W ′ shown in FIG. 5 (left) is obtained in the same manner as in the first embodiment. Then, a forging device, a part of which is shown in FIG. 5, is used. Also in this forging device, a guide hole 13 having a circular cross section and extending vertically is formed through the upper die 11. Below the upper die 11, a lower surface of the guide hole 13 is closed by a flat upper surface, and a lower punch 23 is provided rotatably around the axis O ′ by the same rotating mechanism as in the second and fourth embodiments. Other configurations are the same as in the first embodiment.

The secondary roughing material W is coined by the forging device configured as described above. First, as in the first embodiment, the secondary rough material W ′ is inserted into the cavity. Then, by lowering the upper ram, the upper punch 16 is moved to the guide hole 13
Slide down inside. Thus, the coining force is applied to the secondary rough material W, and the intermediate product is pressed. After this, the lower punch 23 is rotated around 45 ° about the axis O ′. In this way, shearing force is applied to the intermediate product to obtain a molded product.

Therefore, also in the fifth embodiment, the same operation and effect as those in the second and fourth embodiments can be obtained. (Sixth Embodiment) In the sixth embodiment, claims 1, 2, 4, and 5 are embodied. In the forging device used in this embodiment,
As shown in FIGS. 6 (A) and 6 (B), the upper punch 16 in which a convex portion 16c extending in the diametrical direction is provided as a frictional force increasing means at the lower end of the small diameter portion 16a is employed. FIG.
As shown in (A) and (B), a lower punch 18 in which a convex portion 18g extending in the diametrical direction is provided as a frictional force increasing means at the upper end of the small diameter portion 18a is employed. Other configurations are the same as in the first embodiment.

The secondary rough material W is coined by the forging device configured as described above. First, as in the first embodiment, the secondary rough material W is inserted into the cavity. Then, by lowering the upper ram, the upper punch 16 slides down in the guide hole 13. In addition, the lower punch 18 has a 15 ° axis center O
Rotate around. At this time, as shown in FIGS. 8A and 8B, since the convex portions 16c and 18g increase the frictional force with the secondary rough material W, the upper and lower punches 16 and 1 in the secondary rough material W are formed.
The parts (valve seat surface 2a and top surface 2b) facing 8 are twisted to generate strain, and work hardening occurs in the material there. (Test 1) In Test 1, the load reducing effect when the coining force and the shearing force were applied simultaneously was measured.

A secondary coarse material W made of SPCC440 was used to forge a valve lifter 1 (see FIG. 13) in which the skirt portion 3 had an inner diameter of 28 mm, the outer diameter thereof was 31 mm, and the bottom portion 2 had a plate thickness of 2.7 mm. . The rotation angle of the lower punch 18 is 45 °. Coining mean stress (MP
FIG. 9 shows the results when the value a) is taken and the vertical axis is the overhang height y (mm) of the flange 4 in the valve lifter 1 shown in FIG.

As shown in FIG. 9, the flange 4 can be extended higher when the lower punch 18 is rotated than when the lower punch 18 is not rotated.
Therefore, it is understood that the desired forging can be performed with a low coining force by simultaneously applying the coining force and the shearing force. (Test 2) In Test 2, after the coining force was applied to press the intermediate product, the effect of improving the surface roughness of the valve seat surface 2a and the top surface 2b when the intermediate product was subjected to the shearing force was measured.

The clamping force during the application of the shearing force to the intermediate product is 300 MPa. The other conditions are the same as those in Test 1. The results are shown in FIG. As shown in FIG. 10, the Rz value for the secondary rough material W is lower when the lower punch 18 is rotated after pressing than when the lower punch 18 is not rotated after pressing. Therefore, it is understood that the surface roughness of the valve seat surface 2a and the top surface 2b of the valve lifter 1 is improved by applying the shearing force to the intermediate product after applying the coining force to press the intermediate product. Therefore, it is understood that the valve lifter 1 thus obtained can form an engine with excellent performance without deteriorating the opening / closing timing. At this time, since it is not necessary to coin a relatively expensive polished steel material as the secondary rough material W, the valve lifter 1 is inexpensive.

Therefore, in this way, the valve lifter 1
It can be seen that it is possible to improve the surface roughness of the valve seat surface 2a and the top surface 2b in (1) and reduce the cost of the valve lifter 1 at the same time. (Test 3) In Test 3, the flatness improving effect on the top surface 2b when the coining force and the shearing force were simultaneously applied was measured.

The flatness measuring range is φ26 mm. The other conditions are the same as those in tests 1 and 2. The results are shown in Fig. 11.
As shown in FIG. 11, the flatness (mm) is lower when the lower punch 18 is rotated than when the lower punch 18 is not rotated. Therefore, if the coining force and the shearing force are applied at the same time, the secondary rough material W applies only a small reaction force to the forging device, and the upper and lower dies 11, 12 and the upper and lower punches 16, 18 are hardly elastically deformed. Therefore, it is understood that the dimensional accuracy of the valve lifter 1 is improved.

Therefore, in this way, it is understood that the valve lifter 1 having a desired size can be forged by a small coining force in consideration of the result of the test 1. (Test 4) In Test 4, the convex portions 1 are formed on the upper and lower punches 16 and 18.
6c and 18g were provided to measure the hardness improving effect on the valve seat surface 2a and the top surface 2b when the coining force and the shearing force were applied simultaneously.

A secondary coarse material W made of SCM15 is used, the reduction rate of the plate thickness of the bottom portion 2 is 35%, the rotation angle of the lower punch 18 is 15 °, and the hardness measurement range is φ25 mm.
The other conditions are the same as those in Test 1. Results are shown in FIG.
As shown in FIG. 12, the hardness (Hv) is improved more when the lower punch 18 is rotated than when the lower punch 18 is not rotated. For this reason,
It can be seen that work hardening occurs in the material. Therefore, the valve lifter 1 thus obtained has excellent durability. At this time, since it is not necessary to coin a relatively hard steel material as the secondary rough material W, the coining force is relatively small and the dimensional accuracy of the valve lifter 1 does not deteriorate.

Therefore, in this way, the valve seat surface 2a
Also, it can be seen that the valve lifter 1 having a desired hardness and a high hardness of the top surface 2b can be forged.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a forging device according to a first embodiment.

FIG. 2 is a partial cross-sectional view of a forging device according to a second embodiment.

FIG. 3 is a partial sectional view of a forging device according to a third embodiment.

FIG. 4 is a partial sectional view of a forging device according to a fourth embodiment.

FIG. 5 is a partial cross-sectional view of a forging device according to a fifth embodiment.

FIG. 6 shows an upper punch of a forging device according to a sixth embodiment,
(A) is a partial cross-sectional side view and (B) is a bottom view.

FIG. 7 shows a lower punch of a forging device according to a sixth embodiment,
(A) is a partial sectional side view and (B) is a top view.

8A and 8B are schematic cross-sectional views of a rough material and the like before rotation, and FIG. 8B is a schematic cross-sectional view of the rough material and the like after rotation according to the sixth embodiment.

FIG. 9 is a graph showing the relationship between the coining average stress and the flange overhang height in Test 1;

FIG. 10 is a graph showing surface roughness according to Test 2.

FIG. 11 is a graph showing flatness according to test 3;

FIG. 12 is a graph showing hardness according to test 4.

FIG. 13 is a cross-sectional view of a known valve lifter and the like.

FIG. 14 is a cross-sectional view of a known valve lifter or the like.

[Explanation of symbols]

11, 12 ... Die (11 ... Upper die, 12 ... Lower die) 13 ... Guide hole W ... Rough material (secondary rough material) 16, 18 ... Punch (16 ... Upper punch, 18 ... Lower punch) 1, 10 ... Molded product (valve lifter) 16c, 18g ... Friction force increasing means (projection)

Claims (5)

[Claims] 1. A die having a guide hole, and a pair of punches provided so as to be proximate to each other, at least one of which slides in the guide hole and forms a metal rough material together with the guide hole. Using a forging device, a force is applied to the rough material arranged in the guide hole in the approach direction of each punch and the force in the intersecting direction intersecting the approach direction to obtain a molded product. Forging method. 2. The forging method according to claim 1, wherein the force in the approaching direction and the force in the intersecting direction are applied at the same time. 3. The forging process according to claim 1, wherein after the intermediate product is pressed by applying a force in a close direction, a force in a cross direction is applied to the intermediate product to obtain a molded product. Method. 4. The forging method according to claim 2, wherein the force in the intersecting direction is applied by rotating one punch with respect to the rough material or the intermediate product. 5. The forging method according to claim 4, wherein at least one of the punches has a frictional force increasing means for increasing a frictional force with a rough material or an intermediate product.