Method for manufacturing toothed cup-shaped component

Abstract

To provide a manufacturing technology for a toothed cup-shaped component that is environmentally friendly, ensures good tooth shape, and extends the tool life.SOLUTION: A method for manufacturing a toothed cup-shaped component comprises a drawing step, an inclined wall forming step, a preliminary forming step, and a final forming step. A preliminary forming mechanism 40 used in the preliminary forming step includes a third punch 41, a third die 42, and a third pad 43. The third punch 41 has a first truncated conical surface 41b inclined at a first angle θ3 relative to a central axis 41a of the third punch 41. The first truncated conical surface 41b is provided with a tooth-forming ridge 45. The tooth-forming ridge 45 has a vertically elongated trapezoidal shape when viewed in the direction of the arrow 5a in Figure 4(a).SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a manufacturing technique for a toothed cup-shaped part in which teeth are provided on at least one of the inner and outer peripheral surfaces of a metal cup. [Background technology]

[0002] A method for manufacturing a splined cup-shaped part is known (see, for example, Patent Document 1 (FIGS. 12A and 12B)).

[0003] Patent Document 1 will be explained with reference to the following figure. 23(a) and (b) are diagrams for explaining the basic principle of the conventional technology, and FIGS. 23(c) and (d) are comparative reference diagrams for explaining the basic principle. Sodium stearate soap is applied to the workpiece 104 in advance (Patent Document 1, claim 6). Sodium stearate soap is a typical lubricant for plastic processing, and promotes sliding between the punch 105 and the workpiece 104 as well as between the die hole 102 and the workpiece 104, thereby preventing the occurrence of the so-called "galling phenomenon."

[0004] As shown in Fig. 23(a), a die 101 has a protrusion 103 extending vertically in a die hole 102. A workpiece 104 is set in the die hole 102. Next, a punch 105 is used to lower the workpiece 104.

[0005] Then, the workpiece 104 is pressed down by the punch force F and approaches the protrusion 103 . As shown in FIG. 23( b ), the ridges 103 form splines on the outer circumferential surface of the workpiece 104 .

[0006] 23(c) is a comparative reference diagram, in which it is assumed that the surface of the die hole 102 is inclined at an angle θ1 with respect to the vertical axis (the central axis of the punch 105). Then, the punch force F is divided into a component force Fv1 parallel to the surface of the die hole 102 and a component force Fh1 perpendicular to the surface of the die hole 102. The orthogonal component force Fh1 is sufficiently large. This large component force Fh1 presses the workpiece 104 against the ridges 103. As a result, a spline with high dimensional accuracy is obtained.

[0007] FIG. 23(d) is an enlarged view of a main portion of FIG. 23(b), but for ease of explanation, the surface of the die hole 102 is inclined at a small angle θ2 with respect to the vertical axis. The punch force F is divided into a component force Fv2 parallel to the surface of the die hole 102 and a component force Fh2 perpendicular to the surface of the die hole 102. The orthogonal component force Fh2 is smaller than Fh1 in Fig. 23(c) which is a comparative reference diagram. Since the workpiece 104 is pressed against the ridge 103 with the small component force Fh2, the finishing accuracy of the spline is reduced.

[0008] In the case of FIG. 23(b), it is necessary to increase the punch force F to improve the finishing accuracy. In this case, excessive stress is generated in the punch 105 and the die 101, causing a "galling phenomenon" in the punch 105 and the die 101. In addition, the shear stress at the base of the protrusion 103 becomes excessive, shortening the life of the protrusion 103, i.e., the die 101.

[0009] Furthermore, when performing plastic working with a high punching force, it is essential to apply the above-mentioned sodium stearate soap. Sodium stearate soap remains in the cleaning liquid after processing. This sodium stearate soap has an impact on the environment. It is desirable to take measures such as removing the sodium stearate soap from the cleaning liquid before discharging it into the sewer system. As a result, the cost of disposing of the cleaning liquid increases.

[0010] In light of the need for environmental conservation, stabilization of the spline shape, and extended tool life (punch 105 and die 101), there is a demand for manufacturing technology for toothed cup-shaped parts that are environmentally friendly, have a good tooth shape, and can extend the tool life. [Prior art documents] [Patent documents]

[0011] [Patent Document 1] Special Publication No. 2023-515446 Summary of the Invention [Problem to be solved by the invention]

[0012] An object of the present invention is to provide a manufacturing technique for a toothed cup-shaped part which is environmentally friendly, has a good tooth shape, and enables a tool to have a long life. [Means for solving the problem]

[0013] The invention according to claim 1 is a method for manufacturing a cup-shaped part with teeth, which includes at least an inclined wall forming step, a preforming step, and a main forming step, In the inclined wall forming step, the metal disk is drawn into a bottom and a standing wall standing up from the bottom to form an inclined wall arranged at a predetermined first angle; The preforming step is carried out using a vertically elongated trapezoidal tooth-forming protrusion that protrudes downward, In the preforming step, a preform is manufactured by forming a trapezoidal temporary tooth bottom on the inclined wall, The forming step is carried out using a vertically extending rectangular forming protrusion, The main forming process is characterized in that the inclined wall is bent until it becomes parallel to the central axis of the main forming punch, and this bending produces a toothed cup-shaped part in which the trapezoidal temporary tooth bottom is changed to a vertically elongated rectangular tooth bottom.

[0014] The invention according to claim 2 is a method for producing the toothed cup-shaped part according to claim 1, The inclined wall forming step is characterized in that a reference bent portion that serves as a reference for bending in the main forming step is formed.

[0015] The invention according to claim 3 is a method for producing the toothed cup-shaped part according to claim 2, The main forming step is characterized in that the inclined wall is bent around the reference bending portion in sequence from the reference bending portion toward the opening end.

[0016] The invention according to claim 4 is a method for producing the toothed cup-shaped part according to claim 2, The preforming step and the main forming step are characterized in that the material of the inclined wall is caused to flow on the opening end side from the reference bent portion.

[0017] The invention according to claim 5 is a method for producing a toothed cup-shaped part according to claim 2, comprising the steps of: The inclined wall forming step is carried out by an inclined wall forming mechanism, The inclined wall forming mechanism includes a second punch, a second die, and a second pad. The reference bending portion is formed at a portion where three dies consisting of the second punch, the second die, and the second pad are joined together.

[0018] The invention according to claim 6 is a method for producing the toothed cup-shaped part according to claim 1, The preforming step is carried out by a preforming mechanism, The preforming mechanism includes a third punch, a third die, and a third pad. the third punch has a first frustoconical surface; The tooth-forming ridges are provided on the first frustum surface of the third punch.

[0019] The invention according to claim 7 is a method for producing the toothed cup-shaped part according to claim 1, The preforming step is carried out by a preforming mechanism, The preforming mechanism includes a third punch, a third die, and a third pad. the third die includes a third die hole; The tooth-forming ridges are provided in the third die holes of the third die.

[0020] The invention according to claim 8 is a method for producing the toothed cup-shaped part according to claim 1, The preforming step is carried out by a preforming mechanism, The preforming mechanism includes a third punch, a third die, and a third pad. the third punch has a first frustoconical surface; the third die includes a third die hole; The tooth-forming protrusions are provided on the first truncated cone surface of the third punch and on the third die hole of the third die.

[0021] The invention according to claim 9 is a method for producing a toothed cup-shaped part according to claim 8, comprising the steps of: The teeth-forming protrusions on the die side provided in the third die hole of the third die are characterized in that they are shortened in length so that an unformed portion remains on the upper end of the inclined wall.

[0022] The invention according to claim 10 is a method for producing a toothed cup-shaped part according to claim 8 or 9, comprising the steps of: The preforming step includes a first preforming step and a second preforming step subsequent to the first preforming step, a first preforming mechanism used in the first preforming step includes the third punch, the third die having the tooth-forming ridges, and the third pad; a second preforming mechanism used in the second preforming step includes the third punch having the tooth-forming ridges, the third die, and the third pad; In the first preforming step, a first preform having external teeth is manufactured, In the subsequent second preforming step, a second preform having internal teeth in addition to the external teeth is manufactured.

[0023] The invention according to claim 11 is a method for producing the toothed cup-shaped part according to claim 1, An intermediate molding step is added between the pre-molding step and the main molding step, The intermediate forming mechanism used in the intermediate forming step includes an intermediate forming punch, an intermediate forming die, and an intermediate forming pad, the intermediate forming punch has a second truncated cone surface inclined at a second angle smaller than the first predetermined angle with respect to a central axis of the intermediate forming punch, at least one of the intermediate forming punch and the intermediate forming die is provided with an intermediate forming protrusion for preliminarily arranging teeth, and the intermediate forming protrusion is formed into a vertically elongated trapezoidal shape; The intermediate molding step is characterized in that an intermediate molded product is produced in which the inclination of the inclined wall is adjusted to the second angle.

[0024] The invention according to claim 12 is a method for producing a toothed cup-shaped part according to claim 6, comprising the steps of: The third die is characterized in that it is provided with a convex portion facing the tooth-forming protrusion provided on the third punch.

[0025] The invention according to claim 13 is a method for producing the toothed cup-shaped part according to claim 1, The preforming mechanism for carrying out the preforming step and the main forming mechanism for carrying out the main forming step are set in a transfer press device.

[0026] The invention according to claim 14 is a method for producing a toothed cup-shaped part according to claim 1, comprising the steps of: The method includes a drawing step, and a drawing mechanism used in the drawing step includes a first punch, a first die, and a first pad; The inclined wall forming mechanism used in the inclined wall forming step includes a second punch, a second die, and a second pad, the second punch having a side surface inclined at a predetermined first angle with respect to a central axis of the second punch, and the second die having a second die hole corresponding to the second punch; In the drawing step, a curved portion is formed between the bottom and the upright wall, The inclined wall forming step is characterized in that a reference curved portion having a smaller radius of curvature than the curved portion is locally formed in the curved portion. Effect of the Invention

[0027] In the invention according to claim 1, when carrying out a manufacturing method of a toothed cup-shaped part comprising at least a preforming step and a main forming step, in the preforming step, a trapezoidal temporary tooth bottom is formed on an inclined wall inclined at a first angle. The form in which the inclined wall is subjected to plastic processing corresponds to Fig. 23(c), and the punch force is small. In the subsequent main forming step, the part with the tooth shape formed in the preforming step is bent while adjusting the shape, so there is no need to increase the punch force.

[0028] In the preforming process, a trapezoidal temporary tooth bottom is formed, and in the main forming process, the tooth bottom is trimmed to a rectangular shape. Teeth are formed on both sides of the tooth bottom. In the main forming process, a tooth bottom with a good shape and a tooth bottom can be easily formed.

[0029] In at least the preliminary molding step and the main molding step, the punch force can be reduced, and sodium stearate soap as a lubricant can be eliminated. If the amount of sodium stearate soap used is not required, washing liquid is not required, and processing becomes easy, providing an environmentally friendly manufacturing method. In addition, since the punching force is not large, the life of the tools, mainly the punch and die, can be extended.

[0030] As a result, the present invention provides a technique for producing toothed cup-shaped parts that is environmentally friendly, has good tooth geometry, and provides long tool life.

[0031] In the invention according to claim 2, a reference bent portion is formed in the inclined wall forming step. By using this reference bent portion as a reference, the subsequent plastic working can be carried out smoothly.

[0032] In the invention according to claim 3, in the main forming process, the inclined wall is bent from the reference bending portion to the opening end side in sequence, centered on the reference bending portion. Since the bending is performed in sequence, the force applied to the punch and die can be dispersed, and the bending process of the inclined wall based on the reference bending portion can be performed smoothly.

[0033] In the invention according to claim 4, in the preliminary forming process and the main forming process, the material of the inclined wall is caused to flow above the reference curved portion, so that a precise bottom can be formed and precise teeth can be formed on both sides of the bottom.

[0034] In the invention according to claim 5, the reference bending portion is formed at a portion where three dies consisting of the second punch, the second die, and the second pad come together. The reference bending portion can be formed together with the formation of the inclined wall without using a separate die or separate process, which reduces die costs and simplifies the manufacturing method compared to the case where a separate die and separate process are used.

[0035] In the invention according to claim 6, the teeth-forming ridges are provided on the third punch, making it possible to manufacture a cup-shaped part with internal teeth.

[0036] In the invention according to claim 7, the teeth-forming ridges are provided on the third die, making it possible to manufacture a cup-shaped part with external teeth.

[0037] In the invention according to claim 8, the teeth-forming ridges are provided on the third punch and the third die, respectively, and a cup-shaped part with internal and external teeth can be manufactured.

[0038] In the invention of claim 9, since the tooth-forming protrusions on the die side are short in height, an unformed portion can be left at the upper end of the inclined wall, making it possible to manufacture a toothed cup-shaped part with a special shape of internal and external teeth.

[0039] In the invention according to claim 10, the preforming step is divided into the first preforming step and the second preforming step, so that the force applied to the third punch and the third die can be reduced.

[0040] In the invention according to claim 11, an intermediate molding step is added between the preliminary molding step and the main molding step. By adding the intermediate molding step, the burden on the main molding step is significantly reduced.

[0041] In the invention according to claim 12, the third die is provided with a protrusion facing the tooth-forming ridge. When forming a temporary tooth bottom on the inclined wall, the material of the inclined wall can flow along the protrusion in addition to flowing along the tooth-forming ridge. These flows can reduce the force (reaction force) applied to the tooth-forming ridge.

[0042] In the invention according to claim 13, the preforming mechanism and the main forming mechanism are set in a transfer press device. Since the punch force in the preforming mechanism and the main forming mechanism can be reduced, the load on the transfer press device can be reduced, and as a result, the manufacturing cost of the transfer press device can be reduced.

[0043] In the invention according to claim 14, the reference bend portion is formed by the inclined wall forming mechanism. By using this reference bend portion as a reference, the subsequent plastic working can be performed smoothly. [Brief description of the drawings]

[0044] [Figure 1] FIG. 1(a) is a cross-sectional view of a toothed cup-shaped part (internal teeth type) manufactured by the method of the present invention, FIG. 1(b) is a cross-sectional view taken along line bb of FIG. 1(a), and FIG. 1(c) is an oblique view of the toothed cup-shaped part (internal teeth type). [Diagram 2] (a) is a diagram showing the principle of the throttling mechanism, and (b) is a diagram showing the operation of the throttling mechanism. [Diagram 3] 1A is a diagram illustrating the principle of the inclined wall forming mechanism, and FIG. 1B is a diagram illustrating the operation of the inclined wall forming mechanism. [Figure 4] (a) is a diagram showing the principle of the preforming mechanism, and (b) is a diagram showing the operation of the preforming mechanism. [Diagram 5] 5A is an enlarged view of a main part of the third punch taken along the line 5a in FIG. 4, FIG. 5B is a cross-sectional view taken along the line bb in FIG. 5A, FIG. 5C is a cross-sectional view taken along the line cc in FIG. 5A, and FIG. [Figure 6] 6A is an enlarged view of a main part of the preform taken along the line 6a in FIG. 4, FIG. 6B is a cross-sectional view taken along the line bb in FIG. 6A, and FIG. 6C is a cross-sectional view taken along the line cc in FIG. [Figure 7](a) is a diagram illustrating the principle of this forming mechanism, and (b) to (d) are diagrams illustrating the operation of this forming mechanism. [Figure 8] 8A is an enlarged view of a main part of the forming punch as viewed from the arrow 8a in FIG. 7, (b) is a cross-sectional view taken along the line bb in (a), and (c) is a cross-sectional view taken along the line cc in (a). [Figure 9] 1(a) to 1(b) are diagrams illustrating the flow of meat in the main forming process. [Figure 10] 8A is an enlarged view of a main part of the toothed cup-shaped part as viewed from the arrow 8a in FIG. 7, (b) is a cross-sectional view taken along the line bb in (a), and (c) is a cross-sectional view taken along the line cc in (a). [Figure 11] FIG. 2 is a flow diagram illustrating a method for producing a toothed cup-shaped part according to the present invention. [Figure 12] 1A is a perspective view of a toothed cup-shaped part (external teeth type), and FIG. 1B is an enlarged view of part b in FIG. [Figure 13] 1A is a perspective view of a toothed cup-shaped part (internal and external teeth type), and FIG. 1B is an enlarged view of part b in FIG. [Figure 14] 1A is a perspective view of a modified example of a toothed cup-shaped part (internal and external teeth type), and FIG. 1B is a view taken along the arrow b in FIG. [Figure 15] 1A is a diagram illustrating the principle of a preforming mechanism according to a modified example, FIG. 1B is a diagram illustrating the operation of the preforming mechanism, and FIG. 1C is an enlarged view of part c in FIG. [Figure 16] 13(a) and 13(b) are operational views for explaining the main molding process according to the modified example. [Figure 17] 1A is a diagram illustrating the principle of the first preforming mechanism, and FIG. 1B is a diagram illustrating the principle of the second preforming mechanism. [Figure 18] FIG. 11 is a flow diagram illustrating a method for manufacturing another toothed cup-shaped part. [Figure 19] (a) is a diagram showing the principle of the intermediate forming mechanism, (b) is a diagram showing the operation of the intermediate forming mechanism, and (c) and (d) are operational parts explaining the main forming process after the intermediate forming process. [Figure 20] FIG. 11 is a flow diagram illustrating a method for manufacturing yet another toothed cup-shaped part. [Figure 21]FIG. 1( a ) is a diagram for explaining the flow of meat when a convex portion is provided, and FIG. 1( b ) is a diagram for explaining the flow of meat along an inclined wall. [Figure 22] FIG. 1 is a diagram illustrating the principle of a transfer press device. [Figure 23] 1A and 1B are diagrams for explaining the basic principle of the conventional technology, and 1C and 1D are comparative reference diagrams for explaining the basic principle. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0045] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will now be described with reference to the accompanying drawings. In addition, in a plastic processing method using a die and a punch, the method can be carried out in any of the following ways: keeping the die stationary and lowering the punch, keeping the punch stationary and raising the die, or lowering the punch while raising the die. For convenience, the following description will be given assuming that the die is stationary and the punch is lowered.

[0046] In the following description, the terms trapezoidal shape and rectangular shape are used. These refer to the shape of the punch as viewed from the outside, the shape of the die hole as viewed from the center, the shape of the inclined wall as viewed from the inside or outside, or the shape of the peripheral wall as viewed from the inside or outside. EXAMPLES

[0047] [Toothed cup-shaped part] As shown in FIG. 1( a ), the toothed cup-shaped part 10 is a part that is made up of a bottom 11 and a peripheral wall 12 that rises from the bottom 11 . 1(b), teeth 13 are formed on the inner peripheral surface of the peripheral wall 12. The space between adjacent teeth 13 is called a tooth root 14. As shown in FIG. 1(c), the toothed cup-shaped part 10 is an internal tooth type part.

[0048] In FIG. 1( a ), the peripheral wall 12 at the lower end of the tooth 13 is bent toward the center to form a step 15 , and a small diameter portion 16 descends from the inner end of this step 15 , and the lower end of this small diameter portion 16 is connected to the bottom 11 . However, in the following description, for simplicity, the step portion 15 and the small diameter portion 16 will be omitted.

[0049] A reference curved portion 17 having a small radius of curvature is formed at the intersection of the peripheral wall 12 and the step portion 15. The radius of curvature is the reciprocal of the curvature and is the same as the radius.

[0050] The toothed cup-shaped part 10 having such a configuration is manufactured by a drawing process using a drawing mechanism, a sloped-wall forming process using a sloped-wall forming mechanism, a preforming process using a preforming mechanism, and a main forming process using a main forming mechanism. Specific examples of each mechanism and each process will be described in order below.

[0051] [Aperture mechanism] As shown in FIG. 2(a), the squeezing mechanism 20 includes a first pad 23 that urges (pushes) the metal disk 21 against a first punch 22, and a first die 25 having a first die hole 24 that allows the first pad 23 and the first punch 22 to pass through.

[0052] It should be noted that the squeezing mechanism 20 includes a punch lifting mechanism that raises and lowers the first punch 22, a die holder that supports the first die 25, and a spring mechanism that elastically supports the first pad 23, but these will be omitted (the same applies to the other mechanisms below).

[0053] [Squeezing process] In FIG. 2( a ), when the first punch 22 is lowered, the metal disk 21 is drawn along the first die hole 24 . As a result, as shown in Fig. 2(b), a first intermediate product 28 is produced, which is composed of a bottom 11 and a standing wall 27 standing from the bottom 11. A curved portion 29 with an appropriate radius of curvature R1 is formed between the bottom 11 and the standing wall 27. The larger the radius of curvature R1 of the curved portion 29, the easier the drawing becomes.

[0054] [Slope wall formation mechanism] As shown in Figure 3(a), the inclined wall forming mechanism 30 includes a second punch 31, a die base 32, a compression spring 33 extending upward from the die base 32, a second die 34 supported by the compression spring 33 so as to be movable up and down, and a second pad 35. The second punch 31 has a side surface 31b inclined at a predetermined first angle θ3 with respect to an axis (hereinafter simply referred to as the central axis) parallel to a central axis 31a of the second punch 31. The first angle θ3 is, for example, 15°. The second die 34 has a second die hole 36 corresponding to the second punch 31 .

[0055] [Slope wall formation process] 3(a), a first intermediate product 28 manufactured in a previous process (drawing process) is set in the inclined wall forming mechanism 30. The upright wall 27 of the first intermediate product 28 is loosely sandwiched between a second punch 31 and a second die 34. In this state, when the second punch 31 is lowered, the second die 34 is lowered in conjunction with the second punch 31. During their descent, the distance between the second punch 31 and the second die 34 narrows, and this narrowing adjusts the upright wall 27 to the first angle θ3.

[0056] As a result, as shown in FIG. 3(b), a second intermediate product 39 consisting of the bottom 11 and the inclined wall 38 is produced. Preferably, a reference curved portion 17 having a smaller radius of curvature than the curved portion 29 is formed locally on the curved portion (FIG. 3(a), reference symbol 29). The reference curved portion 17 is formed at a portion where three dies consisting of the second punch 31, the second die 34, and the second pad 35 are joined together.

[0057] It is acceptable to form the reference bending portion 17 in a separate process using a separate die. However, as in this embodiment, it is preferable to form the reference bending portion 17 at the same time as preparing the inclined wall 38 with the inclined wall forming mechanism 30, since this reduces manufacturing costs and shortens manufacturing time.

[0058] Although details will be described later, the main plastic processing is performed on the opening end side from the reference bend 17. Since the plastic processing area is determined by the reference bend 17, the subsequent plastic processing can be performed intensively and smoothly.

[0059] [Preforming mechanism] As shown in FIG. 4( a ), the preforming mechanism 40 includes a third punch 41 , a third die 42 , and a third pad 43 . The third punch 41 has a first truncated cone surface 41b inclined at a first angle θ3 with respect to a central axis 41a of the third punch 41. The third die 42 has a third die hole 44 corresponding to the third punch 41 . At least one of the first truncated cone surface 41b and the third die hole 44 (in this example, the first truncated cone surface 41b) is provided with a tooth-forming protrusion 45.

[0060] The truncated cone surface is the surface formed by the hypotenuse of a truncated cone. Further, the tooth-forming ridges 45 are portions that form a temporary tooth bottom, but because they also function to form temporary teeth on both sides of the temporary tooth bottom, they are referred to as tooth-forming ridges for convenience.

[0061] FIG. 5(a) is a view seen from the arrow 5a in FIG. 4(a). As shown in FIG. 5(a), the tooth-forming ridges 45 have a vertically long trapezoidal shape that protrudes downward. The width of the peak (tip) shown in FIG. 5(c) is W, and the width of the peak shown in FIG. 5(b) is W+2α.

[0062] When the inclined wall 38 of the product becomes cylindrical in the final forming, the circumferential length is reduced by tan θ. The above-mentioned α is set to a value that can follow this change. If α is too large, a large punch force is required for forming, and if α is too small, teeth cannot be formed, and in either case, it is not possible to form the product shape. Depending on the conditions of the plastic working (the tendency of material to flow), the teeth-forming ridges 45 may be formed in a vertically elongated trapezoidal shape that protrudes upward.

[0063] [Preforming process] 4(a), the second intermediate product 39 manufactured in the previous step is set in the preforming mechanism 40. Next, the third punch 41 is lowered. Then, the teeth-forming ridges 45 shown in FIG. 5(a) enter the rear surface of the inclined wall 38 shown in FIG. 5(d) as indicated by the arrow (1). As a result, a preform 47 is produced as shown in FIG. 4(b).

[0064] The function of the tooth-forming ridges 45 indicated by the arrow (1) will be further explained with reference to FIG. 21(b). As shown in Fig. 21(b), the inclined wall 38 is strongly pressed by the tooth-forming ridges 45 while being received by the third die 42. As a result, the tooth-forming ridges 45 bite into the inclined wall 38. This biting causes the material inside the inclined wall 38 to flow as indicated by the arrow (2).

[0065] FIG. 6(a) is a view seen from the arrow 6a in FIG. 4(b). As shown in FIG. 6( a ), a temporary tooth bottom 48 having a vertically long trapezoidal shape is formed on the inclined wall 38 , and temporary teeth 49 are formed on both sides of this temporary tooth bottom 48 . As shown in FIG. 6(c), the provisional tooth bottom 48 has a width of approximately W at its lower end.

[0066] As shown in Fig. 6(b), the width at the upper end of the provisional bottom 48 is W+2β. Note that, since the height dimension of the inclined wall 38 shown in Fig. 6(a) is smaller than the height dimension of the third punch 41 (more precisely, the first truncated cone surface 41b) shown in Fig. 5(a), β<α. By the above-mentioned preforming process, a preform (FIG. 4(b), reference numeral 47) is obtained in which a temporary tooth bottom 48 having a trapezoidal shape with an upper base wider than a lower base is formed on the inclined wall 38.

[0067] [Main forming mechanism] As shown in FIG. 7( a ), the full-forming mechanism 50 includes a full-forming punch 51 , a full-forming die 52 , and a full-forming pad 53 . The main forming punch 51 has a cylindrical surface 51 b extending parallel to a central axis 51 a of the main forming punch 51 . At least one of the final forming punch 51 and the final forming die 52 (the final forming punch 51 in this example) is provided with a final forming protrusion 55 for aligning the teeth.

[0068] FIG. 8(a) is a view taken along the arrow 8a in FIG. 7(a). As shown in FIG. 8(a), the final forming ridge 55 provided on the final forming punch 51 has a vertically extending rectangular shape. As shown in FIG. 8(c), the width of the mountain at the lower end of the fully formed ridge 55 is W. As shown in FIG. 8(b), the width of the peak at the upper end of the final forming ridge 55 for aligning the teeth is W. That is, the final forming ridge 55 for aligning the teeth has a rectangular shape extending vertically.

[0069] [Main molding process] 7(a), the preform 47 obtained in the previous step is set in the main forming mechanism 50. Next, the main forming punch 51 is lowered. As shown in FIG. 7(b), the inclined wall 38 starts to be bent in the counterclockwise direction in the drawing by the main forming die 52, starting from the reference bending portion 17.

[0070] As shown in FIG. 7(c), the inclined wall 38 is further bent in the counterclockwise direction in the drawing by a final forming punch 51 and a final forming die 52. As shown in FIG. 7( d ), when the final forming punch 51 reaches the bottom dead center, the inclined wall 38 changes into a peripheral wall 12 extending parallel to the central axis 51 a of the final forming punch 51 .

[0071] 7(a) to (d), a flow of meat occurs within the inclined wall 38 (see also FIG. 21(b)). This phenomenon will be explained with reference to FIGS. 9(a) to (d). FIG. 9(a) is an excerpt of the inclined wall 38 in FIG. 7(a). FIG. 9(d) is an excerpt of the peripheral wall 12 in FIG. 7(d).

[0072] FIG. 9(b) is a development view of the inclined wall 38 shown in FIG. 9(a). As shown in FIG. 9(b), the inclined wall 38 after unfolding has a sector shape with an upper side longer than a lower side. In FIG. 9(b), assume that the lower side is compressed by twice the size, γ1, and the upper side is compressed by twice the size, γ2 (where γ1<γ2).

[0073] As a result, the sector becomes a horizontally long rectangle as shown in FIG. 9(c). When the horizontally long rectangle is rounded, the peripheral wall 12 shown in FIG. 9(d) is obtained. That is, in Figs. 7(a) to (d), the inclined wall 38 was bent from a first angle θ3 (for example, 15°) until the inclination became zero, thereby causing the meat to flow.

[0074] As the meat flows, the height and thickness of the inclined wall 38 change, but the perimeter changes significantly, so in this embodiment, we will focus on the "change in perimeter," which is the largest change.

[0075] FIG. 10(a) is a view taken along the arrow 10a in FIG. 7(d). As shown in Figure 10(a), in the peripheral wall 12, the tooth bottom 14 changed from a trapezoidal shape (Figure 6(a), reference symbol 48) shown by an imaginary line to a vertically long rectangular shape shown by a solid line. In other words, the temporary tooth bottom 48 was narrowed in width on only one side β due to the flow of the meat, and changed into the tooth bottom 14. In parallel, the temporary tooth (Figure 6(a), reference symbol 49) changed into a vertically long rectangular tooth 13 due to the flow of the meat.

[0076] As shown in FIGS. 10(b) and 10(c), the width of the tooth bottom 17 is uniformly W. As a result, the circumferential length of the peripheral wall 12 is constant at the top and bottom sides in Fig. 9, and a toothed cup-shaped part 10 is manufactured in Fig. 7(d). In other words, the peripheral wall is tilted to eliminate die galling, but when it is tilted and then molded into the final shape, the circumferential length is not constant at the top and bottom sides, and the teeth cannot function. The present invention has invented a manufacturing method that molds the peripheral wall so that the circumferential lengths at the top and bottom sides are constant while suppressing die galling. As for the flow of material, as shown in Fig. 21(b), it is made to flow not only in the circumferential direction, but also in the radial direction and the tooth longitudinal direction.

[0077] In addition, in Figures 7(a) to (d), since bending of the inclined wall 38 is mainly performed, the processing reaction force applied to the final forming protrusion 55 for aligning the teeth is significantly smaller than the processing reaction force applied to the tooth-forming protrusion in the previous process (Figure 5, arrow (1)).

[0078] [Manufacturing method of toothed cup-shaped part] The method for manufacturing a toothed cup-shaped part according to the present invention can be summarized as shown in the flow chart of FIG. A first intermediate product consisting of a bottom and an upright wall is obtained by a drawing process in step (hereinafter abbreviated as ST) 01 in FIG. In the inclined wall forming process in ST02, the standing wall is adjusted to a predetermined first angle to obtain a second intermediate product consisting of a bottom and an inclined wall.

[0079] In the preforming process of ST03, a vertically long, trapezoidal temporary tooth bottom is formed on the inclined wall to obtain a preform. In the main molding process in ST04, the inclined wall is erected and the material is brought together to modify the temporary tooth bottom into a rectangular tooth bottom. Through the above steps, the cup-shaped part 10 with internal teeth, which has teeth on the inner circumference, as shown in Figures 1(a) to (c) can be obtained.

[0080] 7(a) to (d), in the final forming process, the inclined wall 38 is bent in sequence from the reference bending portion 17 toward the opening end, with the reference bending portion 17 as the center (starting point). Since the bending is performed in sequence, the force applied to the final forming punch 51 and the final forming die 52 can be dispersed. As a result, the bending process of the inclined wall 38 can be performed smoothly with the reference bending portion 17 as the reference.

[0081] 4(a) and (b), the material of the inclined wall 38 is caused to flow above the reference bend 17, so that a precise temporary tooth bottom can be formed, and precise temporary teeth can be formed on both sides of the temporary tooth bottom. Similarly, the main molding process can form a precise tooth bottom, and precise teeth can be formed on both sides of the tooth bottom.

[0082] [Another type of toothed cup-shaped part] As shown in FIG. 12( a ), the toothed cup-shaped part 10 is a part made up of a bottom 11 and a peripheral wall 12 rising up from the bottom 11 . As shown in FIG. 12(b), the peripheral wall 12 has teeth 13 on its outer circumferential surface. Thus, the toothed cup-shaped part 10 shown in FIG. 12(a) is an external tooth type part.

[0083] The toothed cup-shaped part 10 of this embodiment can be produced by providing the tooth-forming ridges 45 on the third die 42 in Fig. 4(a) and providing the main forming ridges 55 on the main forming die 52 in Fig. 7(a). As there are no other changes, further explanation is omitted.

[0084] [Yet another type of toothed cup-shaped part] As shown in FIG. 13( a ), the toothed cup-shaped part 10 is a part made up of a bottom 11 and a peripheral wall 12 rising up from the bottom 11 . As shown in FIG. 13(b), the peripheral wall 12 has teeth 13 on its inner and outer surfaces. Thus, the toothed cup-shaped part 10 shown in FIG. 13(a) is an internal and external tooth type part.

[0085] The toothed cup-shaped part 10 of this embodiment can be produced by providing the tooth-forming ridges 45 on the third punch 41 and the third die 42 in Fig. 4(a), and by providing the main forming ridges 55 on the main forming punch 51 and the main forming die 52 in Fig. 7(a). As there are no other changes, further explanation is omitted.

[0086] The toothed cup-shaped part 10 of the internal and external tooth type described in FIG. 13(a) may have further different forms.

[0087] [Yet another type of toothed cup-shaped part] As shown in FIG. 14( a ), this cup-shaped part 10 with internal and external teeth is a part made up of a bottom 11 and a peripheral wall 12 rising up from the bottom 11 . As shown in FIG. 14( b ), the tip (upper end in the drawing) of the tooth bottom 14 on the outer periphery is closed by an unformed portion 56 .

[0088] The manufacturing mechanism and method for the internally and externally toothed cup-shaped part 10 having a closed tip will be described with reference to Figs. 15(a) to (c) and Figs. 16(a) and (b).

[0089] [Example of preforming mechanism modification] 15(a), the preforming mechanism 40 includes a third punch 41 having teeth-forming protrusions 45 on a first truncated cone surface 41b, a third die 42 having teeth-forming protrusions 45 in a third die hole 44, and a third pad 43. However, the length of the teeth-forming protrusions 45 on the die side is shorter than the height of the inclined wall 38.

[0090] As shown in FIG. 15(b), the third punch 41 is lowered to perform plastic working on the inner and outer peripheries of the inclined wall . As shown in FIG. 15( c ), an unformed portion 56 remains at the upper end of the inclined wall 38 . That is, the tooth-forming protrusions 45 on the die side provided in the third die hole 44 of the third die 42 are shortened in length so that an unformed portion 56 remains on the upper end of the inclined wall 38 .

[0091] [Example of modification of this molding mechanism] 16(a), the final forming mechanism 50 includes a final forming punch 51 having a final forming ridge 55, a final forming die 52 having a final forming ridge 55, and a final forming pad 53. However, the final forming ridge 55 on the die side is shorter than the height of the inclined wall 38.

[0092] As shown in FIG. 16(b), the main forming punch 51 is lowered to perform plastic working on the inner and outer peripheries of the inclined wall . In this manner, a toothed cup-shaped part 10 having a special shape as shown in Figs. 14(a) and (b) is manufactured.

[0093] In the preforming process shown in Figure 15(a)-(c), the inner and outer temporary tooth bottoms are formed simultaneously in one process, so the punch force is inevitably large. If it is desired to reduce such a large punch force, the following measures are recommended.

[0094] [First preforming mechanism] As shown in FIG. 17( a ), the first preforming mechanism 40 B includes a third punch 41 , a third die 42 having teeth-forming ridges 45 , and a third pad 43 .

[0095] [First preforming process] In the first preforming step, temporary teeth are formed on the outer periphery of the inclined wall 38 to produce a first preform (FIG. 17(b), reference numeral 47B).

[0096] [Second preforming mechanism] As shown in FIG. 17(b), the second preforming mechanism 40C includes a third punch 41 having teeth-forming ridges 45, a third die 42, and a third pad 43.

[0097] [Second preforming process] In the second preforming step, temporary teeth are formed on the inner periphery of the inclined wall 38 to produce a second preform 47C.

[0098] [Method of manufacturing another toothed cup-shaped part] A first intermediate product consisting of a bottom and an upright wall is obtained by the drawing step ST11 in FIG. In the inclined wall forming process of ST12, the upright wall is adjusted to a predetermined first angle to obtain a second intermediate product consisting of a bottom and an inclined wall.

[0099] In a first preforming step ST13, a vertically long trapezoidal temporary tooth bottom is formed on the outer periphery of the inclined wall to obtain a first preform. In the second preforming step ST14, a temporary tooth bottom having a vertically long trapezoidal shape is formed on the inner circumference of the inclined wall in addition to the temporary tooth bottom on the outer circumference, thereby obtaining a second preform. In the main molding process in ST15, the inclined walls are erected and the material is brought together to modify the tooth base and teeth to a rectangular shape, thereby obtaining a cup-shaped part with teeth.

[0100] By dividing the preforming process into two steps, the first preforming process and the second preforming process, the punch force in each process can be reduced to about half, and the lifespan of the third punch 41 and the third die 42 can be extended.

[0101] Incidentally, the manufacturing method for a toothed cup-shaped part described in FIG. 11 comprises a group of steps: drawing step → inclined wall forming step → preforming step → main forming step, and in the main forming step, the inclination angle is corrected, for example, from 15° to 0°. Depending on the conditions of the toothed cup-shaped part (for example, when the wall thickness is large), it is expected that the main forming punch 51 and the main forming die 52 will be overloaded when carrying out the main forming step. In such a case, the intermediate forming mechanism and the intermediate forming step described below are effective.

[0102] [Intermediate forming mechanism] An intermediate forming mechanism 60 shown in FIG. 19(a) is prepared. As shown in FIG. 19( a ), the intermediate forming mechanism 60 is composed of an intermediate forming punch 61 , an intermediate forming die 62 , and an intermediate forming pad 63 .

[0103] The intermediate forming punch 61 has a second truncated cone surface 61b inclined at a second angle θ4 (shown in the lower part of FIG. 4) smaller than the first angle (θ3 in FIG. 4) with respect to the central axis 61a of the intermediate forming punch 61.

[0104] It is preferable to provide an introduction surface with the first angle θ3 above the second angle θ4, that is, at the entrance of the intermediate forming die 62. This allows the intermediate forming punch 61 to be introduced more smoothly. If the first angle θ3 is 15°, the second angle θ4 is set to about 5°.

[0105] At least one of the intermediate forming punch 61 and the intermediate forming die 62 (the intermediate forming punch 61 in this example) is provided with an intermediate forming protrusion 65 for preliminarily aligning the teeth. Although not shown, the intermediate forming ridge 65 has a vertically long trapezoidal shape corresponding to the middle between the tooth-forming ridge (FIG. 5(a), reference numeral 45) and the main forming ridge (FIG. 7(a), reference numeral 55).

[0106] [Intermediate forming process] 19(a), the second intermediate product 39 is set in the intermediate forming mechanism 60. Next, the intermediate forming punch 61 is lowered. As a result, an intermediate molded product 67 shown in Fig. 19(b) is obtained. In this intermediate molded product 67, the inclination angle of the inclined wall 38 is adjusted to the second angle θ4.

[0107] The main forming mechanism 50 in the modified example may be the main forming mechanism 50 described with reference to FIG. 19(c), the intermediate formed product 67 is set in the final forming mechanism 50. Next, the final forming punch 51 is lowered. This results in a toothed cup-shaped part 10 as shown in FIG. 19(d).

[0108] [Method of manufacturing a toothed cup-shaped part including an intermediate forming process] A method for manufacturing a toothed cup-shaped part including an intermediate forming step is illustrated in FIG. A first intermediate product consisting of a bottom and an upright wall is obtained by the drawing step ST21 in FIG. In the inclined wall forming process of ST22, the upright wall is adjusted to a predetermined first angle to obtain a second intermediate product consisting of a bottom and an inclined wall.

[0109] In the preforming step ST23, a provisional tooth bottom having a vertically long trapezoidal shape is formed on the inclined wall to obtain a preform. In the intermediate forming process of ST24, the inclined wall is raised about halfway and the material is gathered, thereby modifying the temporary tooth bottom into a trapezoidal shape to obtain an intermediate formed product. In the main molding process of ST25, the inclined wall is completely erected and the material is pushed in to obtain a toothed cup-shaped part having a rectangular tooth base and teeth.

[0110] [Convex portion facing the tooth-forming ridge] As already explained in FIG. 21(b), within the inclined wall 38, the meat flows as indicated by the arrow (2). 21(a), a protrusion 69 facing the tooth-forming ridge 45 may be provided on the third die 42. By providing the protrusion 69, the flow shown by the arrow (3) can be obtained in addition to the flow shown by the arrow (2). The arrow (2) is the flow along the tooth-forming ridge 45, and the arrow (3) is the flow along the protrusion 69.

[0111] In FIG. 21(b), the teeth-forming ridges 45 receive the reaction force F3. 21(a), the teeth-forming ridges 45 receive a reaction force F4, which is sufficiently smaller than the reaction force F3. In other words, the reaction force F4 is reduced due to the increased flow of the material. As a result, by providing the protrusion 69, the stress in the third punch 41 and the third die 42 is reduced, and the life of the inclined wall forming mechanism 30 can be extended.

[0112] [Transfer press equipment] FIG. 22 is a diagram showing the principle of a transfer press device 70 suitable for carrying out the method of the present invention. 22, the main elements of a transfer press device 70 are a base 71, a lifting plate 72, and first to fifth handling robots 73 to 77. The first to fifth handling robots 73 to 77 may be fingers that grip a workpiece, move it, release it, and return it to its original position, but in this example, they are described as robots for the sake of convenience.

[0113] The transfer press device 70 includes a squeezing mechanism 20 having a first punch 22 and a first die 25, an inclined wall forming mechanism 30 having a second punch 31 and a second die 34, a pre-forming mechanism 40 having a third punch 41 and a third die 42, and a main forming mechanism 50 having a main forming punch 51 and a main forming die 52, arranged in this order.

[0114] The first handling robot 73 places the metal disk 21 into the drawing mechanism 20 . The second handling robot 74 takes out the first intermediate product 28 from the squeezing mechanism 20 and places it into the adjacent inclined wall forming mechanism 30 . The third handling robot 75 takes out the second intermediate product 39 from the inclined wall forming mechanism 30 and places it into the adjacent pre-forming mechanism 40 .

[0115] The fourth handling robot 76 takes out the preformed product 47 from the preform mechanism 40 and places it into the adjacent main forming mechanism 50 . The fifth handling robot 77 removes the toothed cup-shaped part 10 from the main forming mechanism 50 .

[0116] Among the mechanisms 20, 30, 40, and 60 constituting the transfer press device 70, the punch force in the preforming mechanism 40 is the largest. Therefore, attention will be given to the third punch 41 and the third die 42. The third punch 41 and the third die 42 receive a reaction force of the punch force F shown in Fig. 23(c), but this punch force F is sufficiently small due to the inclination at the angle θ1. The main forming punch 51 mainly only bends the inclined wall, so the reaction force received is small.

[0117] That is, it is possible to reduce the punching force of the third punch 41 and the main forming punch 51. As a result, it is possible to reduce the force (load) applied to the transfer press device 70. As a result, it is possible to reduce the manufacturing cost of the transfer press device 70.

[0118] When the intermediate forming mechanism (FIG. 19, reference numeral 60) is added, the intermediate forming mechanism is disposed between the preliminary forming mechanism 40 and the main forming mechanism 50. [Industrial Applicability]

[0119] The present invention is suitable for producing a toothed cup-shaped part consisting of a bottom and a peripheral wall, with teeth provided on at least one of the inside and outside of the peripheral wall. [Explanation of symbols]

[0120] 10...toothed cup-shaped part, 11...bottom, 12...circumferential wall, 13...tooth, 14...tooth bottom, 17...reference curved portion, 20...drawing mechanism, 21...metal disk, 22...first punch, 23...first pad, 25...first die, 27...upright wall, 28...first intermediate product, 29...curved portion, 30...inclined wall forming mechanism, 31...second punch, 31a...center axis of second punch, 31b...side surface of second punch, 34...second die, 35...second pad, 36...second die hole, 38...inclined wall, 39...second intermediate product, 40...preforming mechanism, 40B...first preforming mechanism, 40C...second preforming mechanism, 41...third punch, 41a...center axis of third punch, 41b...first truncated cone surface, 42...third die, 43... Third pad, 44...third die hole, 45...tooth forming ridge, 47...preliminary formed product, 47B...first preliminary formed product, 47C...second preliminary formed product, 48...temporary tooth bottom, 49...temporary tooth, 50...main forming mechanism, 51...main forming punch, 51a...central axis of main forming punch, 51b...cylindrical surface, 52...main forming die, 53...main forming pad, 55...main forming ridge, 56...unformed portion, 60...intermediate forming mechanism, 61...intermediate forming punch, 61a...central axis of intermediate forming punch, 61b...second truncated cone surface, 62...intermediate forming die, 63...intermediate forming pad, 65...intermediate forming ridge, 67...intermediate formed product, 69...convex portion, 70...transfer press device, θ3...first angle, θ4...second angle.

Claims

1. A method for manufacturing a toothed cup-shaped part, comprising at least a sloping wall forming step, a pre-forming step, and a main forming step, The aforementioned toothed cup-shaped component is a component consisting of a bottom and a peripheral wall rising from this bottom. In the inclined wall forming step, the metal disc is narrowed to a bottom and an upright wall rising from the bottom to form an inclined wall that is shaped to a predetermined first angle, and a reference curved portion that serves as the reference for bending in the main forming step is formed. The aforementioned pre-forming process is carried out using tooth-forming protrusions. In the aforementioned pre-forming process, a pre-formed product is manufactured by forming a temporary tooth root on the inclined wall. A method for manufacturing a toothed cup-shaped part, characterized in that, in the molding process described above, the inclined wall is bent sequentially from the reference curved portion toward the open end, the inclined wall is bent until it is parallel to the central axis of the molding punch, the material of the inclined wall is allowed to flow toward the open end from the reference curved portion, and the circumference of the upper and lower sides of the peripheral wall is formed to be constant.

2. A method for manufacturing a toothed cup-shaped component according to claim 1, The inclined wall formation process is carried out by an inclined wall formation mechanism. This inclined wall forming mechanism comprises a second punch, a second die, and a second pad. A method for manufacturing a toothed cup-shaped part, characterized in that the reference curved portion is formed at the point where the three molds, consisting of the second punch, the second die, and the second pad, come together.

3. A method for manufacturing a toothed cup-shaped component according to claim 1, The aforementioned pre-forming process is carried out by a pre-forming mechanism. This pre-forming mechanism comprises a third punch, a third die, and a third pad. The third punch comprises a first frustoconical surface, A method for manufacturing a toothed cup-shaped component, characterized in that the tooth-forming projection is provided on the first frustoconical surface of the third punch.

4. A method for manufacturing a toothed cup-shaped component according to claim 1, The aforementioned pre-forming process is carried out by a pre-forming mechanism. This pre-forming mechanism comprises a third punch, a third die, and a third pad. The third die is provided with a third die hole, A method for manufacturing a toothed cup-shaped part, characterized in that the tooth-forming projection is provided in the third die hole of the third die.

5. A method for manufacturing a toothed cup-shaped component according to claim 1, The aforementioned pre-forming process is carried out by a pre-forming mechanism. This pre-forming mechanism comprises a third punch, a third die, and a third pad. The third punch comprises a first frustoconical surface, The third die is provided with a third die hole, A method for manufacturing a toothed cup-shaped part, characterized in that the tooth-forming projections are provided on the first frustoconical surface of the third punch and the third die hole of the third die, respectively.

6. A method for manufacturing a toothed cup-shaped component according to claim 5, A method for manufacturing a toothed cup-shaped part, characterized in that the tooth-forming projection on the die side provided in the third die hole of the third die is shortened in length so that an unformed portion remains at the upper end of the inclined wall.

7. A method for manufacturing a toothed cup-shaped component according to claim 5 or claim 6, The aforementioned pre-forming process consists of a first pre-forming process and a second pre-forming process following the first pre-forming process. The first preforming mechanism used in the first preforming step comprises the third punch, the third die having the tooth-forming protrusions, and the third pad. The second preforming mechanism used in the second preforming step comprises the third punch having the tooth-forming projection, the third die, and the third pad. In the first pre-forming step, a first pre-formed product having external teeth is manufactured. A method for manufacturing a toothed cup-shaped part, characterized in that the subsequent second pre-molding step produces a second pre-molded product having internal teeth in addition to the external teeth.

8. A method for manufacturing a toothed cup-shaped component according to claim 1, An intermediate molding step is added between the aforementioned pre-molding step and the aforementioned main molding step. The intermediate molding mechanism used in this intermediate molding process comprises an intermediate molding punch, an intermediate molding die, and an intermediate molding pad. The intermediate forming punch has a second frustoconical surface inclined at a second angle smaller than the predetermined first angle with respect to the central axis of the intermediate forming punch, and at least one of the intermediate forming punch and the intermediate forming die is provided with an intermediate forming projection for pre-shaping the teeth, and the intermediate forming projection is in the shape of a vertically elongated trapezoid. A method for manufacturing a toothed cup-shaped part, characterized in that the intermediate molding step involves adjusting the inclination of the inclined wall to the second angle to produce an intermediate molded product.

9. A method for manufacturing a toothed cup-shaped component according to claim 3, A method for manufacturing a toothed cup-shaped part, characterized in that the third die is provided with a protrusion that faces the tooth-forming projection provided on the third punch.

10. A method for manufacturing a toothed cup-shaped component according to claim 1, A method for manufacturing a toothed cup-shaped part, characterized in that the pre-forming mechanism for performing the pre-forming step and the main forming mechanism for performing the main forming step are set in a transfer press device.

11. A method for manufacturing a toothed cup-shaped component according to claim 1, The process includes a diaphragm step, and the diaphragm mechanism used in this diaphragm step comprises a first punch, a first die, and a first pad. The inclined wall forming mechanism used in the inclined wall forming process comprises a second punch, a second die, and a second pad, wherein the second punch has a side surface inclined at a predetermined first angle with respect to the central axis of the second punch, and the second die has a second die hole corresponding to the second punch. In the drawing process, a curved portion is formed between the bottom and the upright wall. A method for manufacturing a toothed cup-shaped part, characterized in that, in the inclined wall forming step, a reference curved portion with a smaller radius of curvature than the curved portion is locally formed in the curved portion.

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