JP5974554B2 - Method and apparatus for manufacturing a press-formed product - Google Patents

Description

  The present invention relates to a press-formed product, a manufacturing method thereof, and a manufacturing apparatus.

  For example, in a unit that rotates at high speed and has a complicated clutch mechanism such as an automatic transmission or a motor, a plurality of structures such as an annular rib may be required. From the viewpoint of moldability and strength, etc. Casting and forging are often used. However, machining such as casting or forging is performed because tolerances such as surface roughness and contour degree may not satisfy the required values.

  For example, in a part having an annular structure, an annular rib is protruded from the bottom wall of a drum having a bottomed cylinder in order to slide a piston inside the part, and a cylinder is constituted by the side wall of the rib. Some have a piston slide inside the cylinder.

  If a plurality of ribs are formed in a limited drum space, the distance between the ribs becomes narrow and the side wall height is high, making it difficult to die for casting or forging. There is a risk of quality degradation.

  In such a case, a method of cutting the entire cast or forged product by machining is employed, but the product cost becomes high. Moreover, the unnecessary part on the strength which exists in a casting or a forged product leads to the increase in product weight.

  A method that does not depend on casting or forging is disclosed in Patent Document 1 below.

  Here, the flange part of the front cover of the torque converter is press-molded using a thickening method to prevent the formation of an extra shape that causes an increase in the product weight, thereby reducing the weight of the product. Yes.

JP 2000-130550 A

  However, in Patent Document 1, in consideration of the molding limit of the blank material, a plurality of steps are performed in many stages so that the blank material does not break. For example, in the above process, a side wall portion to be a rib is formed by a roller, the side wall is brought close to each other, the shape is adjusted, and the tip part is adjusted. For this reason, the method according to Patent Document 1 has a problem that it takes time for processing and cannot be easily molded.

  The present invention has been made to solve the above-described problems, and provides a press-formed product having ribs that can be easily formed only by press forming while considering the forming limit, and a method and apparatus for manufacturing the same. The purpose is to do.

In the present invention that achieves the above object, the first draw forming step of forming a recess having a first side wall and a bottom wall in the blank material by the first draw forming, and the bottom wall standing from the opposite direction to the first draw forming. A second draw forming step of forming the second side wall facing and connected to the first side wall through the space portion by second draw forming, and further bringing the second side wall close to the first side wall, that having a contact step of molding. After the second draw forming step, the second side wall is formed thinner than the first side wall, and in the contact step, the first U-shaped connecting portion that connects the end of the first side wall and the end of the second side wall is formed. An external force is applied to the second side wall side with the side wall side opened.

  According to the manufacturing method of the present invention, the second side wall is molded to the position where the first side wall and the second side wall are opposed to each other through the space without immediately adhering the second side wall to the first side wall. The first side wall and the second side wall are in close contact with each other. For this reason, even if the molding limit of the press is taken into consideration, it is possible to easily and quickly manufacture a press-formed product having ribs with a small number of processes of the first drawing process, the second drawing process, and the adhesion process. . Moreover, it can contribute to the cost reduction of a press-molded product by being able to manufacture a press-molded product quickly with few processes.

  Moreover, according to the manufacturing apparatus which concerns on this invention, the said press molded product is manufactured using only a press die, without using a roller. For this reason, even if it does not go through various processes with a roller, the press molded product which has a rib from a blank material can be manufactured simply and rapidly only with a press die.

It is a schematic sectional drawing which shows the usage example of the press-formed product which concerns on this invention. 2 (A) to 2 (D) are schematic views showing a forming process of a press-formed product in Embodiment 1 of the manufacturing method according to the present invention. It is a schematic sectional drawing before the 1st draw forming process in the manufacturing apparatus of the same Embodiment 1. It is a schematic sectional drawing after the 1st draw forming process in the manufacturing apparatus of the same Embodiment 1. FIG. It is a schematic sectional drawing before the 2nd draw forming process in the manufacturing apparatus of the same Embodiment 1. It is a schematic sectional drawing after the 2nd draw forming process in the manufacturing apparatus of the same Embodiment 1. It is a schematic sectional drawing before the contact process in the manufacturing apparatus of the same Embodiment 1. It is a principal part expanded sectional view of FIG. It is a principal part expanded sectional view of the blank material at the time of the contact | adherence process. It is a principal part expanded sectional view of the blank material after the contact | adherence process. It is a principal part expanded sectional view at the time of completion of the finishing process in the manufacturing apparatus of the same Embodiment 1. It is sectional drawing of the blank material at the time of the 1st draw forming process completion in Embodiment 2 of the manufacturing method which concerns on this invention. It is sectional drawing of the blank material at the time of the completion of the 2nd draw forming process of Embodiment 2. It is sectional drawing of the blank material at the time of the 1st contact | adherence process completion of the same Embodiment 2. FIG. It is sectional drawing of the blank material at the time of the completion of the 3rd draw forming process of Embodiment 2. It is sectional drawing of the blank material at the time of the 2nd contact | adherence process completion of the same Embodiment 2. FIG. In the same Embodiment 2, it is a top view at the time of providing a some cyclic | annular rib on the same axis | shaft or a different axis | shaft with respect to the central axis. It is sectional drawing of the blank material which shows the state at the time of the completion of the 1st, 2nd draw forming process of Embodiment 3. It is sectional drawing of the blank material which shows the state at the time of the 3rd draw forming process completion of the same Embodiment 3. FIG. It is sectional drawing of the blank material which shows the state at the time of the 1st close_contact | adherence process completion of the same Embodiment 3. It is sectional drawing of the blank material which shows the state at the time of the completion of the 4th drawing process of Embodiment 3. It is sectional drawing of the blank material which shows the state at the time of the 2nd contact | adherence process completion of the same Embodiment 3. It is sectional drawing which shows the blank material at the time of the 1st draw forming process completion in the press-molded article which concerns on the same Embodiment 4. FIG. It is sectional drawing which shows the blank material at the time of the 2nd draw forming process completion in the press molded product which concerns on the same Embodiment 4. FIG. It is sectional drawing which shows the blank material at the time of completion | finish of a contact | adherence process in the press-formed product which concerns on the same Embodiment 4. FIG. It is sectional drawing which shows the blank material at the time of completion of a finishing process in the press-formed product which concerns on the same Embodiment 4. FIG. It is sectional drawing which shows the modification of the press-formed product which concerns on the same Embodiment 4. 28A to 28C are cross-sectional views showing modifications of the press-formed product according to the fourth embodiment. It is sectional drawing which shows the press-formed product which concerns on the same Embodiment 5. It is a schematic sectional drawing which shows the state before the 2nd draw forming process in the manufacturing apparatus of the press-formed product which concerns on the same Embodiment 5. FIG. It is a schematic sectional drawing which shows the state at the time of the 2nd draw forming process completion in the manufacturing apparatus of the press-molded product which concerns on the same Embodiment 5. FIG. It is a schematic sectional drawing which shows the state at the time of the close_contact | adherence process completion in the manufacturing apparatus of the press-formed product which concerns on the same Embodiment 5. FIG. It is a schematic sectional drawing which shows the state at the time of completion of the finishing process in the manufacturing apparatus of the press-formed product which concerns on the same Embodiment 5. FIG. It is sectional drawing which shows the press-formed product which concerns on the same Embodiment 6. It is a schematic sectional drawing which shows the state before the 3rd draw-forming process in the manufacturing apparatus of the press-formed product which concerns on the same Embodiment 6. It is a schematic sectional drawing which shows the state at the time of the completion | finish of the 3rd draw-forming process in the manufacturing apparatus of the press-formed product which concerns on the same Embodiment 6. It is a schematic sectional drawing which shows the state before the contact | adherence process in the manufacturing apparatus of the press-formed product which concerns on the same Embodiment 6. It is a schematic sectional drawing which shows the state at the time of completion | finish of the contact | adherence process in the manufacturing apparatus of the press-formed product which concerns on the same Embodiment 6. It is a schematic sectional drawing which shows the state at the time of completion of the finishing process in the manufacturing apparatus of the press-formed product which concerns on the same Embodiment 6. It is sectional drawing which shows the modification of the press-formed product which concerns on the same Embodiment 6.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In addition, the following description does not limit the technical scope and terms used in the claims. In addition, the dimensional ratios in the drawings are exaggerated for convenience of explanation, and may differ from actual ratios.

(Embodiment 1)
(Press-formed product)
FIG. 1 is a schematic cross-sectional view showing a specific use example of a press-formed product according to the present invention. This press-molded product is used, for example, for a clutch mechanism in a motor case of an electric vehicle. In FIG. 1, the clutch mechanism has a bottomed cylindrical drum 1 corresponding to a press-formed product W, and a drum-like structure (rib) 10 is provided inside the drum 1 in parallel to the central axis. . The tip of the rod 21 of the piston 2 that passes through and protrudes through the bottom wall 14 is attached to the clutch 3 so that the clutch 3 is intermittently connected.

  In the drum 1, an annular rib 10 that functions as a cylinder side wall is formed from the bottom wall 14, and the piston 2 is accommodated in a cylinder bore formed by the rib 10 and the peripheral wall 15. A proximal end of a rod 21 is attached to the piston 2, and a distal end of the rod 21 is attached to the clutch 3.

  In the first embodiment, the press-formed product W corresponding to the drum 1 is composed of two plate materials each having an annular rib 10 as a side wall, and is press-molded so that they are in close contact with each other. The annular rib 10 is formed from a blank made of a hot rolled steel sheet for automobile structure (hereinafter referred to as SAPH).

  The annular rib 10 forms an annular first side wall 11 that hangs down from the plate surface of the blank, and the U-shaped connecting portion 13 is formed by bending the annular second side wall 12 to a position facing the first side wall 11. It is molded integrally through

  In particular, in the first embodiment, the first side wall 11 and the second side wall 12 are not immediately brought into close contact with each other, and the second side wall 12 and the first side wall 11 and the space are prevented from breaking off from the U-shaped connecting portion 13. After being formed once to a position facing each other through the part, the proximity or close contact is performed.

  Note that the radius of curvature r1 of the tip portion of the annular rib 10 and the radius of curvature r2 and r3 of the base portion are both small radii of curvature as described later.

  For this reason, since the press-formed product W can be easily and quickly manufactured by only the normal pressing by the manufacturing method according to the present invention, the cost of manufactured parts can be reduced. Further, since the ribs 10 provided on the press-formed product W can be narrowed to such an extent that they can be in close contact with each other, the degree of design freedom can be improved in terms of space.

  Moreover, since the press-formed product according to the present invention is widely used for various parts, it is possible to contribute to weight reduction of various parts.

(Press-molded product manufacturing method and manufacturing equipment)
First, the manufacturing method of the press-formed product W will be outlined with reference to FIG. FIG. 2 is a schematic view showing a forming process of the press-formed product in the first embodiment. In FIG. 2, the same members as those shown in FIG. 1 are denoted by the same reference numerals, and the press mold is omitted here, and only the press-formed product W is shown.

  In the manufacturing method of the press-formed product W according to Embodiment 1, the blank material B is deep-drawn in the first draw forming step, and the recess 16 having the first side wall 11 and the bottom wall 14 is formed (see FIG. 2A). Then, in the second drawing step, the bottom wall 14 is raised from the opposite direction to the first drawing, and the first side wall 11 and the second side wall 12 are connected via the U-shaped connecting portion 13. (See FIG. 2B).

  And an external force is provided to the U-shaped connection part 13 in a contact | adherence process, and the 2nd side wall 12 is closely_contact | adhered to the 1st side wall 11 (refer FIG. 2C). Then, in the finishing step, the tip portion and the root portion of the rib 10 are finished into a predetermined shape (see FIG. 2D). Hereinafter, it explains in full detail according to each process.

(First drawing process)
FIG. 3 is a schematic cross-sectional view showing a state before the first draw forming process of the manufacturing apparatus used in Embodiment 1 of the manufacturing method according to the present invention, and FIG. 4 is a schematic cross section after the first draw forming process of the manufacturing apparatus. FIG. In the first embodiment, a case where one rib 10 is formed will be described for simplification.

  As shown in FIG. 3, the manufacturing apparatus 20 </ b> A (first press unit) of the first embodiment is provided with a punch plate 23 attached to a slide so as to be movable up and down with respect to a die holder 21 attached to a bolster. An annular die 22 is placed on the die holder 21, and a die 27 a is provided at the center of the die 22.

  The punch plate 23 is provided with a first punch (first press die) 26a at a position corresponding to the die 27a. A blank holder 24 for pressing the blank material B installed on the upper surface of the die 22 is suspended from the punch plate 23 via a spring 25 around the first punch 26a.

  In addition, each height of the die | dye 22, the 1st punch 26a, and the die | dye 27a is set suitably according to the height h (refer FIG. 1) of the rib 10 to shape | mold.

  In the manufacturing apparatus 20A (first press portion), when the blank material B is carried between the first punch 26a and the die 22 in a separated state, the first punch 26a faces the die 27a as shown in FIG. The blank B is deep drawn. As a result, the blank 16 is formed with a recess 16 composed of the first side wall 11 and the bottom wall 14 as shown in FIG. 2A.

  Depending on the height of the first side wall 11, the blank material B may be cracked due to the molding limit of the blank material B. Therefore, in order to prevent this crack, the first draw forming process is divided into multiple stages. You may go.

(Second drawing process)
FIG. 5 is a schematic cross-sectional view of the manufacturing apparatus using the manufacturing method according to Embodiment 1 before the second drawing process, and FIG. 6 is a schematic cross-sectional view of the manufacturing apparatus after the second drawing process. In addition, the same code | symbol is attached | subjected to the structure which is common in FIG.3, 4, and description is abbreviate | omitted.

  In the manufacturing apparatus 20B (second press section), as shown in FIG. 5, a thin and cylindrical auxiliary die 28 and a die 27b are suspended from the punch plate 23, and the die holder 21 side corresponds to the die 27b. A second punch (second press die) 26b is provided at a position so as to be movable up and down. By attaching the auxiliary mold 28, it is possible to prevent the height h of the rib 10 from being reduced more than necessary.

  Depending on the size of the radius of curvature of the U-shaped connecting portion 13 to be molded or the material of the blank material B itself, the U-shaped connecting portion 13 does not break even without using the auxiliary die 28. In some cases, the rib 10 can be formed. In this case, the auxiliary mold 28 may be omitted.

  The outer diameter Db of the second punch 26b is smaller than the outer diameter Da of the first punch 26a, and the bottom wall 14 in the inner region of the auxiliary die 28 is pressure-molded.

  In the manufacturing apparatus 20B, when the blank material B after the first draw forming is carried between the auxiliary mold 28 and the die 22 that are separated from each other, the auxiliary mold 28 is lowered as shown in FIG. to go into. Then, as shown in FIG. 6, the second punch 26b rises.

  That is, the second punch 26b moves in the opposite direction to the first punch 26a at the time of the first drawing. Then, the bottom wall 14 of the blank material B is raised along the auxiliary mold 28 so that the first side wall 11 and the second side wall 12 are connected to each other via the U-shaped connecting portion 13. Bend 180 degrees.

  Thereby, the blank material B is formed with the second side wall 12 facing the first side wall 11 via the space S (see FIG. 2B), and the second side wall 12 is first through the U-shaped connecting part 13. Molded integrally with the side wall 11. The first side wall 11 and the second side wall 12 later become the annular rib 10.

  In the case of forming an annular rib, it is considered that the second side wall 12 can be formed more quickly by bringing the second side wall 12 into close contact with or close to the first side wall 11 in the second draw forming step without going through the close contact step described later. However, in the press molding, if the first side wall 11 and the second side wall 12 are brought into close contact with each other by the second drawing molding opposite to the first drawing molding as described above, the U-shaped connecting portion 13 that is a bending point is formed. In some cases, stress concentrates and breaks.

  Therefore, in the present invention, the second side wall 12 is once formed in the second drawing step so that the first side wall 11 and the space S exist, and then the second side wall 12 is brought close to the first side wall 11 in the adhesion step described later. Or they are in close contact. As a result, the first side wall 11 and the second side wall 12 are molded so as to be in close contact with a small number of processes while considering the molding limit.

  In the first draw forming and second draw forming processes, the shape of the blank material B near the center of the bottom wall 14 is stretched by the punches 26a and 26b or the auxiliary die 28 to reduce the plate thickness. On the other hand, the portion around the bottom wall 14 is drawn into the first side wall 11 during the first draw molding. Therefore, the thickness of the second side wall 12 is thinner than that of the first side wall 11 at the stage where the first draw forming and the second draw forming are completed.

  Further, in the SAPH of 14 mm or less, which is defined in the same manner as JIS by the applicant as a design standard, the space portion S between the first side wall 11 and the second side wall 12 when the blank material B is bent to about 180 degrees. The 180 degree bend guarantee value gap is set to 1 t which is the size of the plate thickness t.

  However, when 180-degree bending is performed in the deep drawing as in the first embodiment, the first side wall 11 and the second side wall 12 have a difference in plate thickness as described above, compared to normal bending. Depending on the circumstances, breakage may occur even in a gap larger than usual.

  Therefore, in the first embodiment, the distance of the space S between the first side wall 11 and the second side wall 12 is at least about twice the 180-degree bending guaranteed value gap of the blank material B, that is, 2 t, so that the tensile stress is increased. This prevents breakage of a portion where P is concentrated (Pc in FIG. 8). The 180 degree bend guarantee value gap varies depending on the material.

(Adhesion process)
7 is a schematic cross-sectional view showing a state of the manufacturing apparatus using the manufacturing method according to Embodiment 1 before the contact process, FIG. 8 is an enlarged cross-sectional view of the main part of FIG. 7, and FIG. FIG. 10 is an enlarged cross-sectional view of a main part of FIG. 7, and FIG. 10 is an enlarged cross-sectional view of the main part showing a state after the adhesion process.

  In the manufacturing apparatus 20C (third press portion), as shown in FIG. 7, a receiving die 29 is attached to the lower surface of the punch plate 23 via a spring 25, and a third punch (third press) is provided on the die holder 21 side. A mold 26c is provided so as to be movable up and down. The outer diameter Dc of the third punch 26c is set larger than the outer diameter Db of the second punch 26b so that the first side wall 11 and the second side wall 12 can be brought into close contact with each other.

  In the manufacturing apparatus 20 </ b> C, as shown in FIG. 7, when the blank material B after the second drawing is carried between the receiving mold 29 and the die 22 in a separated state, the third punch 26 c rises. .

  Here, the tip shoulder portion of the third punch 26c is circular so as to come into contact with and pressurize the portion Pc where the tensile stress is concentrated in the tip bending portion of the U-shaped connecting portion 13 of the blank B as shown in FIG. It is arcuate.

  This point will be further described in detail. As described above, the first side wall 11 and the second side wall 12 have the first side wall 11 made thicker and the second side wall 12 made thinner by the first drawing and second drawing.

  In this situation, if press molding is performed to bring the first side wall 11 and the second side wall 12 close to each other without taking any special measures, the second side wall is displaced from the tip of the U-shaped connecting portion 13 as shown in FIG. There is a possibility that tensile stress is generated and concentrated at the position (for example, point Pc) and breaks.

  In this case, in FIG. 8, since the tensile stress is generated clockwise and counterclockwise in the radial direction from the stress concentration point Pc (see the arrow in FIG. 8), both tensile stresses are canceled to prevent breakage. It is desirable to do.

  However, both tensile stresses at the stress concentration point Pc cannot be offset by simply pressing the U-shaped connecting portion 13 from below and bringing the second side wall 12 close to the first side wall 11. In order to cancel the tensile stress, another punch for applying an external force to the stress concentration point Pc is required. If a separate punch is added, the cost of the manufacturing apparatus increases.

  Therefore, in the first embodiment, only the third punch 26c is moved in the axial direction so that the tip shoulder portion of the third punch 26c comes into pressure contact with the portion Pc where the tensile stress increases as shown in FIGS. Enables close molding.

  As a result, the stress state at the portion Pc where the tensile stress is concentrated due to the rise of the punch 26c can be relaxed by applying an external force from the opposite direction to the tensile stress. Further, by relaxing the tensile stress, the first side wall 11 and the second side wall 12 are brought close to twice the above-mentioned 180-degree bending guaranteed value gap while preventing the occurrence of breakage, or as shown in FIG. It can be adhered.

  At this time, it is desirable that the curvature radius R1 of the tip shoulder portion of the third punch 26c that brings the first side wall 11 and the second side wall 12 close to each other is about four times the plate thickness t of the blank material B. This fourfold is because it is necessary to consider the positional deviation between the third punch 26c and the blank material B, the variation in shape of each, and the like. If the radius of curvature R1 of the tip shoulder is too small, even if the tip shoulder is pressed against the stress concentration point Pc, the stress concentration is transferred to the periphery of the stress concentration point Pc, thereby sufficiently preventing breakage. It is also because it becomes impossible.

(Finishing process)
FIG. 11 is an enlarged cross-sectional view of the main part at the completion of the finishing process of the manufacturing apparatus using the manufacturing method according to the first embodiment.

  In the finishing step, as shown in FIG. 11, with the blank B sandwiched between the die 22d and the receiving die 29, the radii of curvature r1, r2, r3 of the tip portion and the root portion of the rib 10 are set by the die 22d and the fourth punch 26d. Small ribs are formed to complete the rib 10.

  The final finishing step is a step for increasing the sliding distance when the piston 2 is slid as shown in FIG. 1 by reducing the radii of curvature r1, r2, r3 of the tip portion and the base portion of the rib 10. . Therefore, when the rib 10 is not used as a sliding portion of the piston, the radius of curvature of the tip end or the root portion of the rib does not have to be reduced as described above.

  Embodiment 1 mentioned above has the following effects.

  (A) According to the manufacturing method of the press-formed product W having the annular rib 10 according to the first embodiment and the manufacturing apparatus using the manufacturing method, the first side wall 11 is formed on the blank material B by the first drawing. To do. And the 2nd side wall 12 which opposes the 1st side wall 11 via the space part S is shape | molded by the 2nd draw forming in which a direction differs from 1st draw forming.

  Then, the annular rib 10 is formed by bringing the second side wall 12 into close contact with the first side wall 11.

  For this reason, even if the molding limit of the press is taken into consideration, a press-molded product having an annular rib can be easily and quickly manufactured with a small number of processes of three processes. Moreover, it can contribute to the cost reduction of a press-molded product by being able to manufacture a press-molded product quickly with few processes.

  Further, a rib that has been conventionally formed through a number of steps using a roller or the like can be easily and quickly formed only by a press die, and the number of processing steps can be reduced.

  (B) The press die used in the close-contact process is brought into pressure contact with the portion on the second side wall side of the U-shaped connecting portion 13 where breakage occurs in the U-shaped connecting portion.

  For this reason, if drawing is performed simply using a press die, the fracture occurs from the stress concentration site. Can be prevented.

  Moreover, it can be made to adjoin so that the 1st side wall 11 and the 2nd side wall 12 closely_contact | adhere by preventing generation | occurrence | production of the fracture | rupture of the said part.

  Moreover, since the close contact between the first side wall 11 and the second side wall 12 is made possible by the axial movement of the third punch 26c, the side walls can be brought close to or in close contact with each other without additional mold parts. it can.

  (C) In the second drawing process before the adhesion process according to the first embodiment, the distance between the first side wall 11 and the second side wall 12 is set to be twice or more of the 180-degree bending guaranteed value gap.

  For this reason, unlike a normal 180 degree bend, even if it is a case where the thickness difference produces the 1st side wall 11 and the 2nd side wall 12, it does not produce a fracture | rupture from the U-shaped connection part 13, but is stable. Thus, the first side wall 11 and the second side wall 12 can be molded to such a degree that they are in close contact with each other.

  (D) The radius of curvature R1 of the tip shoulder portion of the third punch 26c used in the contact step is secured about four times the plate thickness of the blank material. For this reason, even if it considers variation, the front-end shoulder part of the 3rd punch 26c can be press-contacted to a tension stress concentration site | part, and it can also prevent that a stress transfers to a peripheral site | part.

  (E) In the contact step, the second side wall 12 in the vicinity of the U-shaped connecting portion 13 where the fracture occurs is brought close to the first side wall 11 by the third punch 26c. For this reason, the external force which relieves the said tensile stress can be provided to the site | part in which a fracture | rupture arises with a tensile stress, and it can be made to adjoin so that the 1st side wall 11 and the 2nd side wall 12 closely_contact | adhere.

  (F) In the case where the side wall of the annular rib 10 is used as a cylinder and the piston is slid inside, the radius of curvature of the rib tip and the root is formed smaller in the finishing process than at the completion of the adhesion process. Thus, the sliding portion can be further enlarged.

  (G) In the press-molded product manufactured by the manufacturing method according to the first embodiment, the annular rib is not a separate member but is formed from the same blank material. For this reason, even if it does not weld another member, the press molded product which has an annular rib can be manufactured, and it can contribute to reduction of component cost.

  In addition, the distance between the first side wall 11 and the second side wall 12 is made close to twice the 180 degree bending guaranteed value gap of the material of the blank material B, which cannot be normally performed. For this reason, it becomes possible to use the press-formed product according to Embodiment 1 more widely than before, and the degree of design freedom can be improved. Moreover, since the press-formed product according to the present invention can be widely used for various parts, it is possible to contribute to weight reduction of various parts.

(Embodiment 2)
12-16 is sectional drawing which shows the shaping | molding state of the blank material B in each manufacturing process which concerns on Embodiment 2. FIG. In addition, the code | symbol uses the same code | symbol as the member which is common in Embodiment 1, and since the manufacturing apparatus of the press-formed product which concerns on Embodiment 2 is the same as that of Embodiment 1, it abbreviate | omits.

  In the first embodiment, one rib 10 is formed on the blank B, but in the second embodiment, a plurality of ribs 10 are formed on one plate surface of the blank B as follows.

(First drawing process)
In the first drawing process, the first drawing is performed from the top to the bottom as shown by the arrows in FIG. 12 to form the two first side walls 11a and 11b and the bottom walls 14a and 14b. The first side walls 11a and 11b may be formed at a time using a stepped mold or may be divided into two stages.

  Here, the interval between the two first side walls 11a and 11b needs to be secured at least eight times the thickness of the blank material B.

  As shown in FIG. 15, the curvature radius R1 of the tip shoulder portion of the third punch 26c is 4 times the plate thickness t, the plate thickness for the second side wall, and the distance between the first side wall 11b and the second side wall 12b. This is because at least a distance obtained by adding twice the plate thickness and the plate thickness for the first side wall is necessary.

  In FIG. 15, since the plate thickness of the first side wall 11b and the second side wall 12b varies depending on the plate thickness and the drawing depth at the time of drawing, the thickness of the first side wall 11b and the second side wall 12b is set for convenience. It is shown by 1t before drawing. As described above, the first side wall 11b is thickened and the second side wall 12b is thinned by drawing, so the distance between the first side walls 11a and 11b is at least 8 times the plate thickness of the blank material. It is necessary to.

(Second drawing process)
In the second draw forming step, the second side wall 12a is formed by raising the bottom wall 14a upward from below as indicated by the arrow in FIG.

(First adhesion process)
In the first contact step, the punch is moved from the lower side to the upper side of the second side wall 12a as shown by the arrow in FIG. 14, and the second side wall 12a is brought into close contact with the first side wall 11a to form the first rib 10a.

(Third drawing process)
In the third drawing process, the bottom wall 14b is drawn from below to above as shown by the arrow in FIG. 15 to form the second side wall 12b. In order to prevent the punch and other mold parts used at that time from collapsing the already formed first rib 10a, it is necessary to match the shape of the blank as much as possible even if the shape becomes complicated.

(Second adhesion process)
In the second contact step, the punch is moved from the lower side to the upper side of the second side wall 12b as indicated by the arrow in FIG. 16, and the second side wall 12b is moved to the first side wall 11b so that the second side wall 12b is in close contact with the first side wall 11b. The second rib 10b is formed close to the side wall 11b.

(Finishing process)
Although the finishing process is not shown, the curvature radii of the tips and roots of the first rib 10a and the second rib 10b are formed smaller than the curvature radii formed when the contact process is completed, as in the first embodiment.

  It should be noted that the molding order when molding a plurality of ribs may be from the inside or from the outside. However, it is necessary to keep in mind that the shape of the mold is matched to the molded shape as much as possible in consideration of dimensional stability and the already molded ribs are not crushed.

  FIG. 17 is a plan view when the annular rib is provided differently from the case where the center position is provided coaxially. In the case where a plurality of annular ribs 10 are provided, the central axes of the plurality of annular ribs 10 may be coaxial as shown in FIG. 17A, or may be different axes as shown in FIG. Good. When forming the annular rib, if the pitch is set to 8 times or more the plate thickness of the blank as described above, it can be formed even when the central axis is different, and the degree of freedom in design can be improved.

  Embodiment 2 mentioned above has the following effects.

  (A) According to the manufacturing method of the press-formed product W having the annular ribs 10a and 10b according to the second embodiment and the manufacturing apparatus using the manufacturing method, the already formed rib 10a matches the molded shape without being crushed. Molding is performed using the punch and mold parts. For this reason, it is possible to easily and quickly form a press-formed product in which a plurality of annular ribs 10 protrude.

  (B) As described above, a plurality of annular ribs can be formed by setting the pitch of the adjacent first side walls 11a and 11b to a pitch of 8 times or more the thickness of the blank material as described above.

  (C) A press-formed product having a plurality of annular ribs by the method according to the second embodiment can form a plurality of ribs in response to various requirements such as component strength and layout. Can be improved.

  (D) Since a plurality of ribs of a press-formed product can be formed coaxially or differently from the central axis by the above method, a press-formed product having ribs arranged at various positions can be obtained, thereby further improving the degree of freedom in design. Can be made.

(Embodiment 3)
18 to 22 are cross-sectional views showing the blank material B in the respective manufacturing steps according to the third embodiment. In the second embodiment, the ribs are formed on the lower surface of the blank material B, that is, on the same surface side, but can be formed on both upper and lower surfaces.

(First and second drawing process)
In the first draw forming, the first side wall 11c and the bottom wall 14c are formed by drawing from the bottom to the top as indicated by the arrows in FIG. In the second draw forming, the first side wall 11d and the bottom wall 14d are formed by drawing from the top to the bottom. The order of the first drawing and the second drawing may be reversed as long as the shape can be reproduced.

(Third drawing process)
In the third draw forming step, the bottom wall 14c is pushed down from above as indicated by the arrow in FIG. 19, and the second side wall 12c facing the first side wall 11c through the space S is formed.

(First adhesion process)
In the first contact step, the punch is lowered from above the second side wall 12c as shown by the arrow in FIG. 20, and the second rib 12c is formed in close contact with the first side wall 11c.

(Fourth drawing process)
In the fourth draw forming step, the bottom wall 14d is raised upward from below as indicated by the arrow in FIG. 21, and the second side wall 12d facing the first side wall 11d through the space S is formed.

(Second adhesion process)
In the second contact step, the punch is raised from the vicinity of the second side wall 12d as shown by the arrow in FIG. 22, and the second rib 10d is formed by bringing the second side wall 12d into close contact with the first side wall 11d.

  According to the method for manufacturing a press-formed product according to the third embodiment, the ribs protruding on both the upper and lower surfaces on the plate surface of the blank material B can be formed.

  Embodiment 3 mentioned above has the following effects.

  (A) According to the manufacturing method of the press-formed product W having the annular rib 10 and the manufacturing apparatus according to the manufacturing method according to the third embodiment, the annular rib 10 is moved up and down by changing the direction in which a plurality of drawing processes are performed. It is possible to easily and quickly form a press-molded product that protrudes into the area.

  (B) Since the press-molded product molded by the manufacturing method according to Embodiment 3 can arrange ribs from both sides of the flat plate portion, it can meet various requirements such as strength and layout, and the range of use is expanded and designed. The degree of freedom can be improved.

(Embodiment 4)
FIGS. 23 to 26 are cross-sectional views for explaining a method for manufacturing a press-formed product according to the fourth embodiment, and FIGS. 27 and 28A to 28C are modified examples of the press-formed product of the fourth embodiment. It is sectional drawing shown. In the second embodiment, as shown in FIG. 2 (D), the bottom wall 14 formed on the radially inner side of the annular rib 10 and the flange portions 18a and 18b formed on the radially outer side of the annular rib 10 are the same. The press-formed product that becomes the height has been described. However, the bottom wall 14 and the flange portions 18a and 18b from the annular rib 10 do not have to be formed at the same height as shown in FIG.

(First drawing process)
The press-formed product according to the fourth embodiment is formed as follows. In addition, since the structure of the manufacturing apparatus of the press-formed product which concerns on Embodiment 4 is the same as that of Embodiment 1, description is abbreviate | omitted.

  First, in the first drawing process, as in the first embodiment, the blank material B is carried between the first punch 26a and the die 22 shown in FIGS. 3 and 4, and the punch 26a is lowered toward the die 27a. And draw forming. As a result, as shown in FIG. 23, the blank material B is formed with a flange portion 18c and a concave portion 16 composed of the first side wall 11e and the bottom wall 14e.

(Second drawing process)
Next, in the second draw forming step, as shown in FIG. 5, the blank material B after the first draw forming is carried between the auxiliary die 28 and the die 22, and the auxiliary die 28 is lowered to enter the recess 16. Let it enter. Then, the punch 26b is raised, and the first side wall 11e is bent 180 degrees so that the first side wall 11e and the second side wall 12e are connected via the U-shaped connecting portion 13e.

  In Embodiment 1, the drawing was performed until the bottom wall 14 and the flange portions 18a and 18b shown in FIG. On the other hand, in the fourth embodiment, the height of the die 27b is adjusted, the die 27b is formed so as to enter the recess 16, the punch 26b is raised, and drawing is performed. As a result, the bottom wall 14e is drawn to a position lower than the flange portion 18c as shown in FIG.

(Adhesion process, finishing process)
Since the adhesion process and the finishing process are the same as those in the first embodiment, detailed description thereof is omitted, but in the adhesion process, the second side wall 12e is brought close to or in close contact with the first side wall 11e using a punch 26c as shown in FIG. Let Then, in the finishing step, as shown in FIG. 26, the curvature radius of the tip portion and the root portion of the annular rib 10e is formed to be smaller than the curvature radius formed in the contact step.

  In FIG. 26, the bottom wall 14e is formed to be lower than the flange portion 18c, but the die 27b may be formed at a height that is spaced upward from the upper surface of the flange portion 18c, and the second draw forming may be performed. As a result, as shown in FIG. 27, a press-molded product in which the bottom wall 14e is higher than the flange portion 18c can be formed.

  Further, it is possible to punch out a portion of the bottom wall 14e of the press-formed product. That is, the blanking material B after the adhesion process shown in FIG. 25 is punched using a punching punch having the same diameter as the second side wall 12e. As a result, as shown in FIG. 28A, it is possible to mold a press-formed product in which the end surface 14f formed by punching is formed lower than the flange portion 18c.

  Further, by forming the bottom wall 14e before punching higher than that in FIG. 25 and performing punching, the end face 14f and the flange portion 18c have the same height as shown in FIG. 28B. A molded product can also be molded. Further, by punching blank material B in which bottom wall 14e shown in FIG. 27 is formed higher than flange portion 18c, as shown in FIG. 28C, a press-formed product in which end surface 14f is formed higher than flange portion 18c. Can also be molded.

  Embodiment 4 mentioned above has the following effects.

  By adjusting the height of the die 27b in the second draw forming step, it is possible to form press-formed products having different heights of the bottom wall 14e and the flange portion 18c.

  As described above, by using the press-formed product according to the fourth embodiment, it is possible to attach a component having a bottom wall having a different height in the axial direction without using a spacer or the like. By adjusting the height of the bottom wall 14e and the flange portion 18c as described above, the degree of freedom in design is improved, and a press-molded product having annular ribs having different bottom wall heights is formed without welding separate parts. This can contribute to cost reduction.

  Further, by punching out the bottom wall portion 14e of the press-molded product, even a press-molded product in which a mating part is inserted and attached can be molded by the method according to this embodiment, and the degree of design freedom is further increased. Can be improved.

(Embodiment 5)
FIG. 29 is a cross-sectional view showing a press-formed product according to the fifth embodiment, and FIGS. 30 to 33 are cross-sectional views for explaining a method for manufacturing the press-formed product according to the fifth embodiment. In the first to fourth embodiments, the press-formed product having the flange portions 18a and 18b shown in FIG. However, it is also possible to form a press-molded product having no flange portion as shown in FIG. 29 by the method according to this embodiment.

(Second drawing process)
In the present embodiment, as shown in FIG. 30, a blank material B is prepared in which the first side wall 11f is already formed by drawing and has no flange portion on the radially outer side than the first side wall 11f. Since the process of forming the first side wall 11f is the same as the first drawing process in the first embodiment, the description thereof is omitted. In addition, since trimming for trimming the flange portion is well-known, the description is omitted here, and the description starts from the second draw forming step.

  As shown in FIG. 30, the die 27b constituting the press part 20B in the second draw forming process has a convex part having an outer diameter that is the same as the inner diameter of the first side wall 11f. Further, the blank holder 24 is formed so as to have an inner diameter comparable to the outer diameter of the first side wall 11f in order to prevent the first side wall 11f from being deformed outward when the drawing is performed.

  By forming the die 27b and the blank holder 24 in this way, it is possible to perform drawing with the blank material B being fixed even if the flange portion is not formed on the press-formed product.

  In the second drawing process, as shown in FIG. 30, the blank material B is fixed by the die 27b and the blank holder 24, the punch 26b is lowered toward the die 27b, and drawing is performed. As a result, the second side wall 12f and the U-shaped connecting portion 13f are formed in the blank B as shown in FIG.

(Adhesion process)
As shown in FIG. 32, the die 29 that constitutes the press part 20C in the adhesion process has a convex portion that is approximately the same as the inner diameter of the first side wall 11f, and the blank holder 24 is approximately the same as the outer diameter of the first side wall 11f. It is formed to have an inner diameter.

  When the blank material B is placed on the die 29 in such a state, the blank holder 24 is lowered to fix the blank material B. Then, the punch 26c performs drawing while pressing the arc-shaped plate portion on the second side wall side of the U-shaped connecting portion 13f in the same manner as in the first embodiment, so that the second side wall 12f is the first side as shown in FIG. Adjacent to or in close contact with the side wall 11f.

(Finishing process)
In the finishing process, as shown in FIG. 33, with the blank material B fixed by the blank holder 24 and the die 29, the radius of curvature of the tip portion and the root portion of the annular rib 10 is smaller than that of the close contact step by the punch 26d. To form.

  Embodiment 5 mentioned above has the following effects.

  The second side wall 12f and the U-shaped connecting portion 13f are formed in the second drawing step in a state where the blank material B without the flange portion is fixed by the die holder 24 and the die 29.

  And in the contact | adherence process, the 2nd side wall 12f is closely thru | or closely_contact | adhered to the 1st side wall 11f, and by performing a finishing process, the press molded product which does not have a flange part can be shape | molded without casting or forging. Thus, the freedom degree of design can further be improved by being able to manufacture the press-molded product without a flange part by the method which concerns on this embodiment.

(Embodiment 6)
34 is a cross-sectional view showing a press-formed product according to the sixth embodiment, FIGS. 35 to 39 are cross-sectional views for explaining a method for manufacturing the press-formed product according to the sixth embodiment, and FIG. It is sectional drawing which shows the modification of the press molded product which concerns. In the first to fifth embodiments, as shown in FIG. 8, in the contact process, the punch 26 c is brought into contact with the portion on the second side wall side of the U-shaped connecting portion 13 from the radially inner side in the press-formed product to perform drawing. It was. However, when the annular rib is formed by stacking three or more side walls as shown in FIG. 34, it is also possible to perform the contact process by bringing the punch into contact with the outer side in the radial direction.

  In the present embodiment, as shown in FIG. 34, in addition to the first side wall 11g and the second side wall 12g, a third side wall 19 is formed on the radially outer side of the first side wall 11g, and the first side wall 11g and the second side wall 12g. And an annular rib 10g comprising the third side wall 19 is formed. Since the molding method up to the first side wall 11g and the second side wall 12g is the same as that of the first embodiment, the description thereof is omitted. Moreover, the process of forming the 3rd side wall 19 is called a 3rd draw forming process.

(Third drawing process)
As shown in FIG. 35, the punch 26e constituting the press portion 20E in the third draw forming step has a recess so that the third side wall 19 can be formed on the radially outer side of the first side wall 11g. The diameter of the recess of the punch 26e is 2t, which is a 180 degree bend guarantee value gap, and a newly formed plate of the third side wall 19 so that the blank material B does not break during drawing as described above. It is separated from the outer diameter of the first side wall 11g by 3t or more including the thickness.

  The die 29 has a convex portion having an outer diameter approximately equal to the inner diameter of the second side wall 12g, and the height of the convex portion is configured to be approximately the same as the height of the blank material B.

  In the third drawing process, the blank B is placed and fixed on the die 29 as shown in FIG. 35, the punch 26e is lowered, and drawing is performed. As a result, the third side wall 19 and the U-shaped connecting portion 13g are formed outside the first side wall 11g as shown in FIG.

(Adhesion process)
As shown in FIG. 37, the die 29 constituting the press part 20C in the adhesion step has a convex part having an inner diameter comparable to that of the second side wall 12g so that the blank material B can be fixed. The height of the convex portion is formed to be approximately the same as the height of the blank material B as in the fifth embodiment. Further, as shown in FIG. 38, the punch 26c has a recess having an inner diameter that is obtained by adding the plate thickness of the blank material B to the outer diameter of the first side wall 11g so that the third side wall 19 can be in close contact with the first side wall 11g. Have.

  When the third side wall 19 is brought close to or in close contact with the first side wall 11g and the second side wall 12g, the first side wall 11g and the second side wall 12g are not brought close to the third side wall 19 in this close contact step, but the third side wall 19 Is drawn so as to be close to the first side wall 11g and the second side wall 12g.

  In the first embodiment, the second side wall 12 is formed to be thinner than the first side wall 11, so that the portion on the second side wall which is inside the U-shaped connecting portion 13 shown in FIG. It has been explained that stress concentrates on Pc.

  On the other hand, in this embodiment, it can be considered that the first side wall 11g and the second side wall 12g are already in close contact during the close contact process, and the first side wall 11g and the second side wall 12g are integrated. . If the plate thickness of the third side wall 19 is compared with that in which the first side wall 11g and the second side wall 12g are integrated, the plate thickness of the third side wall 19 is thinner. Therefore, when the first side wall 11g and the second side wall 12g are made to approach the third side wall 19, the part Pc on the third side wall 19 side in the U-shaped connecting portion 13g is formed relatively thin. There is a possibility that stress concentrates on Pc and breaks.

  Therefore, in the present embodiment, as shown in FIG. 37, the tip shoulder R2 of the punch 26c is brought into contact with the portion Pc on the third side wall side where stress is concentrated in the U-shaped connecting portion 13g. Then, the punch 26c is lowered to perform drawing, and the annular rib 10g is formed by bringing the third side wall 19 into close contact with the first side wall 11g as shown in FIG.

(Finishing process)
In the finishing process, as shown in FIG. 39, with the blank material B fixed by the die 29, the radius of curvature of the tip portion and the root portion of the annular rib 10g is made by the punch 26d as compared with the time of the adhesion process, as in the above embodiment. Mold small.

  In addition, as shown in FIG. 40, the punching described in the fourth embodiment may be performed from the lower side to the upper side in the drawing on the press-formed product in which three or more side walls according to this embodiment are laminated. Further, the number of laminated side walls in the annular rib 10g may not be three.

  Embodiment 6 mentioned above has the following effects.

  The third side wall 19 is formed on the outer side in the radial direction of the first side wall 11g, and the punch 26c is brought into contact with the portion Pc on the third side wall 19 side in the U-shaped connecting portion 13g from the outer side in the radial direction to perform drawing. Thus, the annular rib 10g can be formed by laminating three or more side walls without causing cracks in the newly formed third side wall 19. Thus, if the manufacturing method according to the present embodiment is used, even a press-formed product having a rib having a thickness sufficiently larger than the thickness of the blank material can be manufactured, and other parts need to be welded or the like. This can contribute to cost reduction.

  In addition, the press-molded product comprising three or more side walls can be expanded through the bottom wall portion in the same manner as in the fourth embodiment, thereby expanding the application range of the manufacturing method according to the present embodiment, reducing the weight and cost of parts. It can contribute to reduction.

  In addition, although the manufacturing method which concerns on Embodiment 1-6 demonstrated the case where it utilized for components of a rotary body shape, this invention is not limited to this, An annular rib may also be shape | molded to components which are not a rotary body shape. Is possible. Also, the present invention can be applied to molding a non-annular rib such as a polygonal shape, a linear shape, or an arc shape.

1 drum,
10 annular ribs,
11 First side wall,
12 Second side wall,
13 U-shaped connecting part,
14 Bottom wall,
14f end face,
16 recess,
17 opening,
18a-18c flange part,
19 3rd side wall 20A 1st press part,
20B 2nd press part,
20C Third Press Department,
22 dies,
22d die (used during finishing process),
26a 1st punch (1st press die),
26b second punch (second press die),
26c 3rd punch (3rd press die),
27a die,
29 receiving mold,
B blank material,
R1 radius of curvature of the third punch tip,
r1 radius of curvature of the annular rib tip,
r2 radius of curvature of the annular rib base,
r3 radius of curvature of the annular rib base,
S space part,
t Blank thickness.

Claims (8)

A first draw forming step of forming a recess comprising a first side wall and a bottom wall in the blank material;
A second draw forming step of forming an annular second side wall that is opposed to and integrally connected to the first side wall through the space by raising the bottom wall from a direction opposite to the first draw forming. When,
Have a, an adhesion step of forming the ribs in close proximity with said second sidewall and said first side wall,
After the second draw forming step, the second side wall is formed thinner than the first side wall,
In the adhesion step, an external force is applied to the second side wall side in a state where the first side wall side of the U-shaped connecting portion that connects the end portion of the first side wall and the end portion of the second side wall is opened. , Manufacturing method of press-molded products. In the second draw forming step, the distance of the space between the first side wall and the second side wall is a 180 degree bend guarantee value gap that is a minimum gap that does not break even if the blank material is bent 180 degrees. 2. The method for manufacturing a press-formed product according to claim 1, wherein the distance is at least twice . 3. The press-formed product according to claim 1 , wherein a radius of curvature of a tip shoulder portion of a press die used in the contact process has a radius of curvature that is at least four times the plate thickness of the blank material . Production method. The method for manufacturing a press-formed product according to any one of claims 1 to 3 , wherein in the adhesion step, the second side wall is brought close to the first side wall . The radius of curvature of the annular rib tip and the root portion of the press-molded product is formed smaller than the radius of curvature of the rib tip and the root portion after the contact process , respectively. A method for producing a press-formed product according to 1. The press according to any one of claims 1 to 5, wherein when a plurality of the ribs are formed, a pitch between the adjacent first side walls is set to 8 times or more a plate thickness of the blank material. Manufacturing method of molded products.   A first press die and a die that are relatively close to and away from each other. The first press die is moved toward the die, and a concave portion including a first side wall and a bottom wall is formed in the blank material by first drawing. A first press part formed by:
  There is an auxiliary die and a second press die that are relatively close to each other, and the bottom wall is opposite to the first drawing by the second press die in a state where the auxiliary die is accommodated in the recess. A second press part for forming the second side wall by rising from the direction of the second side wall by facing the first side wall through the space part,
  The U-shaped connecting portion has a receiving die and a third press die that are relatively close to each other and connects the first side wall and the second side wall that is thinner than the first side wall. The first side wall and the second side wall can be obtained by pressing the third press die against the arc-shaped plate portion on the second side wall side while opening the first side wall side and moving toward the receiving die. A third press part for forming a rib by bringing the
An apparatus for producing a press-formed product, comprising: The apparatus for manufacturing a press-formed product according to claim 7 , wherein a radius of curvature of a tip portion of the third press die is at least four times a plate thickness of the blank material .

Images