CN113661021B - Manufacturing method of stamped products - Google Patents

Abstract

The method of manufacturing a press-formed product includes: a first processing step of forming a first flange portion protruding toward a first side X1 in a first direction X with respect to a plate-shaped base portion (20) by plastically deforming a part of a metal plate (30), and the corner portion; and the second processing step, by pressing the front end of the first flange portion (30) formed on the first side X1 in the first direction X to the second side X2 in the first direction X, so that The material of the first flange part (30) flows toward the second side X2 of the first direction X to form a second flange part (40) protruding toward the second side X2 of the first direction X relative to the base part (20); The thickness T2 of the second flange portion is smaller than the thickness T1 of the first flange portion after the second processing step, and the ratio of the thickness T2 to the thickness T1 and the product R×T2/T1 of the radius R outside the corner portion less than 3.5.

Description

Manufacturing method of stamped products

technical field

The present invention relates to a method of manufacturing a stamped product.

This application claims priority based on Japanese Patent Application No. 2019-071411 filed on April 3, 2019, the contents of which are incorporated herein.

Background technique

The transmission member has a hub portion protruding from both sides in the direction of the rotation shaft along the direction of the rotation shaft as a functional surface of the transmission member, and is attached to the rotation shaft. In order to form such a hub portion, for example, there is a method of welding two members. In this method, a portion serving as one side of the hub portion is formed from a part of one metal plate by plastic working such as burring. Then, the member on the other side of the hub portion and the other side of the metal plate on which the portion on one side of the hub portion is formed are joined by welding to form the transmission member as described above. In addition, as another method, there is a method of sintering metal powder sintered powder through a mold formed into a shape corresponding to the transmission member. The above-mentioned method of welding the two members requires the steps of processing the two members, and also requires the step of welding, which increases the number of manufacturing steps. Therefore, in the above-mentioned method of welding two members, the manufacturing cost becomes high, and the tact time spent in manufacturing also becomes long. In addition, in the method of performing sintering, a step of heat treatment related to sintering is also required, and the production cost becomes high, and the tact time required for the production also becomes long.

In addition, Patent Document 1 discloses a technique of protruding to one side of a metal plate by press working, and then protruding a part of the part protruding to one side by press working to the other side, thereby from A piece of metal plate has the barrel protruding to both sides of the metal plate. In such a technique, it is possible to reduce the number of steps compared to the above-mentioned method of welding two members or the above-mentioned method of sintering. However, in the technology described in Patent Document 1, when a part of the part protruding to one side is protruded to the other side by press working, the original metal plate and the protruding part may be bent. The problem that the defect folded in at an acute angle is formed at the inner corner portion of the . In addition, Patent Document 2 discloses that after forming the cup vertical wall portion protruding from the cup bottom, the cup vertical wall portion is drawn and formed, thereby thickening the cup vertical wall portion and the cup shoulder portion, and molding the cup vertical wall portion from the cup bottom. The remainder of the bottom protrudes. However, the technology described in Patent Document 2 does not disclose a specific solution to the problem of the defect that is folded at an acute angle in the inner portion of the cup bottom and the cup vertical wall. Processing methods for solving such problems are proposed in Patent Documents 3 and 4, for example.

Specifically, in Patent Document 3, a method of manufacturing a metal member is proposed, which includes: forming a tube portion on one side of a plate-shaped material by plastic working; a step of plastically deforming the tip-side inner peripheral portion into a root-side inner peripheral portion to thicken the root portion; and a step of extruding the thickened root-side inner peripheral portion to the other side of the plate-shaped material. In addition, in the manufacturing method of Patent Document 2, by implementing the above-mentioned three steps, it is possible to form a member in which the tube portion protrudes to both sides with respect to the original plate-shaped material. And, by forming the tube part protruding to the other side by the thickened part, it is enough that the original tube part of the tube part protruding to one side is not squeezed out, and it is possible to suppress the above-mentioned folding at an acute angle. Defects. In addition, Patent Document 4 proposes that when molding a molded product including an elongated flange portion, a flange peripheral portion, and a flange extending portion in which the elongated flange portion extends from the corner side, A burring molded product having a small radius of curvature or a substantially right angle on the outer side of the corner between the elongated flange portion and the flange peripheral portion is used as a workpiece. And, by pushing in the end surface of the elongated flange portion of the workpiece, the material constituting the elongated flange portion is moved to form the extended flange portion, and the radius of curvature of the outer side of the corner portion is used as described above. The workpiece is small or approximately right-angled so that buckling does not occur inside the corner.

prior art literature

patent documents

Patent Document 1: Japanese Patent Application Laid-Open No. 11-10275

Patent Document 2: International Publication No. 2014/109240

Patent Document 3: Japanese Patent Laid-Open No. 2018-83215

Patent Document 4: Japanese Patent Laid-Open No. 2017-196632

Contents of the invention

The problem to be solved by the invention

However, in the manufacturing method disclosed in Patent Document 3, in addition to the steps of forming the portion protruding in the shape of a flange on one side and the process of forming the portion protruding in the shape of a flange on the other side, it is necessary to The process of suppressing the defect of folding in at an acute angle in the inner part between the original metal plate part and the part protruding in the shape of a flange to one side. That is, it is also necessary to perform a step of thickening the root portion of the portion protruding to one side in a flange shape. Therefore, also in the manufacturing method disclosed in Patent Document 1, there are problems in that the number of steps increases, the manufacturing cost is high, and the tact time required for manufacturing becomes long. In addition, in the manufacturing method disclosed in Patent Document 4, when the part protruding like a flange formed on one side is pushed in and the part protruding like a flange is formed on the other side, the workpiece The radius of curvature of the outer side of the corner portion is defined as a right angle or a smaller radius of curvature approximately close thereto. In actual processing, the radius of curvature of the outer portion is not limited to a small radius of curvature that is at a right angle or approximately close to a right angle, but it is required to form flange-like extensions on both sides under various radii of curvature. A technology that prevents the defect of folding in at an acute angle from occurring on the inside part.

Therefore, the present invention has been made in view of the above-mentioned circumstances, and provides a method of manufacturing a press-formed product capable of preventing defects such as folding in at an acute angle at an inner portion protruding like a flange. Furthermore, a press-formed product having flange-like protruding portions on both sides can be manufactured from a single metal plate with fewer steps.

means to solve problems

In order to solve the above-mentioned problems, the present invention adopts the following technical means.

That is, in the method of manufacturing a press-formed product according to an aspect of the present invention, a part of one metal plate is plastically deformed so that the plate-shaped base portion protrudes toward the first side in the first direction in the thickness direction of the base portion. The first flange portion, and a corner portion extending in a curved line is formed between the base portion and the first flange portion; a first backing plate is arranged along the first flange portion; sandwiching the first flange part and arrange a second backing plate on the side opposite to the first backing plate; sandwich the above-mentioned base and on the side opposite to the first flange portion to form a gap between the second backing plate and the first backing plate A third backing plate is arranged with a small gap with the second backing plate; between the first backing plate and the second backing plate, the first backing plate is arranged so as to be able to advance and retreat in the first direction. A punch formed on the front end surface of the flange portion on the first side in the first direction to press; by pressing the front end face of the first flange portion on the second side in the first direction, the first protrusion The material of the edge portion flows toward the second side of the first direction to form a second flange portion that protrudes toward the second side of the first direction relative to the base portion; The thickness T1 of the above-mentioned first flange portion after the second flange portion is relatively thin; the thickness T2 [mm] of the above-mentioned second flange portion after forming the above-mentioned second flange portion is different from the thickness T1 [ mm] and the product of the radius R (mm) of the curved outer side of the above-mentioned corner in a cross-section of the above-mentioned corner along its extending direction after forming the above-mentioned corner, that is, R×T2/T1 is less than 3.5 .

According to this method, first, as a first working step, a part of one metal plate is plastically deformed to form a first flange portion and a corner portion protruding toward a first side in a first direction with respect to a plate-shaped base portion. Next, as a second processing step, by pressing the front end of the first flange portion formed on the first side in the first direction to the second side in the first direction, the material of the first flange portion is pushed toward the second side in the first direction. The two sides flow to form a second flange portion protruding toward the second side in the first direction relative to the base portion. Here, in the initial stage of the second processing step, since the front end surface of the first flange portion is pushed, the corner portion formed by the base portion and the first flange portion is plastically deformed and falls into the corner as the second flange portion. in the range. However, by making the thickness T2 of the second flange portion smaller than the thickness T1 of the first flange portion after the second processing step, and making the thickness of the second flange portion after the second processing step The ratio of T2 to the thickness T1 of the first flange portion and the product of the radius R of the outer side of the corner portion after the first processing step, that is, R×T2/T1, is less than 3.5. The formed corner portion falls into the range that is the second flange portion. Therefore, in the second working step, it is possible to suppress the defect that an acute-angled tuck-in shape is formed at the inner portion of the corner due to the drop of the corner, and the second flange portion can be formed by the second working step.

In addition, in the method of manufacturing the press-formed product, in the third backing plate, a plane including a surface along the second flange after the second flange is formed may be opposite to In the first backing plate, a plane including a surface along the first flange portion is located on a side of the first flange portion in a direction perpendicular to a surface along the first flange portion. In other words, after the second flange portion is formed, the plane including the surface along the second flange portion in the third backing plate passes through the inside of the above-mentioned first flange portion.

According to this method, in the second processing step, the surface of the third backing plate along the second flange portion after the second processing step is compared to the surface of the first backing plate along the first flange portion. The surface is located on the side of the first flange part in the direction perpendicular to the surface along the first flange part, and especially at the corner part, the material on the side of the third backing plate can be prevented from falling into the third backing plate and the second backing plate. In the gap between the plates, the defect of the tuck-in shape that forms an acute angle at the inner portion of the corner is further suppressed.

In addition, in the method of manufacturing the press-formed product, in the second backing plate, surfaces along the first flange portion and the second flange portion may be formed in a straight line along the first direction. shape.

According to this method, in the second processing step, by forming the surface of the second backing plate along the first flange portion and the second flange portion in a linear shape along the first direction, it is possible to suppress the occurrence of a problem especially at the corner portion. The material on the side of the third backing plate falls into the gap between the third backing plate and the second backing plate, further suppressing the defect of the tuck-in shape that forms an acute angle at the inner portion of the corner. Moreover, in the 1st flange part and the 2nd flange part, the mutually different thickness can be formed and the surface connected linearly can be formed.

In addition, in the method of manufacturing the press-formed product, when the second flange portion is formed, the front end of the first flange portion formed on the first side in the first direction faces the first flange portion. From the beginning of the process of pressing the material of the first flange part to the second side in the first direction by pressing the second side in the first direction, at least halfway through the completion of the process, the first flange in the base part and the first flange The connection part where the parts are connected applies an external force from the second side in the first direction toward the first side in the first direction to plastically deform the first flange part.

According to this method, from the start of the process of making the material of the first flange part flow toward the second side in the first direction until at least halfway through the completion of the process, the connecting portion connected to the first flange part in the base part is changed from the first flange part to the first flange part. The second side in the direction applies an external force toward the first side in the first direction. Stress is generated by plastically deforming the first flange portion, so that the materials of the first flange portion and the base portion connected to the first flange portion plastically flow toward the second side in the first direction of the base portion. However, during at least halfway through the process of making the material of the first flange portion flow toward the second side in the first direction by applying an external force toward the first side in the first direction from the start of the process until the completion of the process, by the external force, Plastic flow to the second side in the first direction rather than to the base can be suppressed. Therefore, it is possible to prevent the plastic flow of material from both the base portion and the first flange portion to the second side in the first direction of the base portion to form an acute-angled tuck-in shape at the inner portion connecting the base portion and the first flange portion. defect. And, after a certain amount of deformation due to the processing has occurred from the start of the processing of making the material of the first flange portion flow toward the second side in the first direction, by causing the portion generated by the deformation to act on the first The pressing force on the front end surface of the flange portion deforms toward the second side in the first direction, thereby further suppressing occurrence of acute-angled tuck-in defects and forming the second flange portion.

Invention effect

According to the present invention, it is possible to manufacture a stamping having flange-like protruding parts on both sides from a single metal plate with fewer steps without causing a defect that the inner part protruding in the shape of a flange is folded in at an acute angle. moldings.

Description of drawings

FIG. 1 is a partially cutaway perspective view showing a press-formed product produced by a method for producing a press-formed product according to a first embodiment.

FIG. 2 is a detailed view of part A in FIG. 1 .

Fig. 3 is a flow chart illustrating a method of manufacturing a press-formed product according to the first embodiment.

4 is a perspective view of a steel plate used in the method of manufacturing a press-formed product according to the first embodiment.

5A is a process diagram illustrating a first working step in the method of manufacturing a press-formed product according to the first embodiment.

5B is a process diagram illustrating a first working step in the method of manufacturing a press-formed product according to the first embodiment.

6 is a cross-sectional view of an intermediate product formed in a first working step in the method of manufacturing a press-formed product according to the first embodiment.

7A is a process diagram illustrating a second working step in the method of manufacturing a press-formed product according to the first embodiment.

7B is a process diagram illustrating a second working step in the method of manufacturing a press-formed product according to the first embodiment.

7C is a process diagram illustrating a second working step in the method of manufacturing a press-formed product according to the first embodiment.

7D is a process diagram illustrating a second working step in the method of manufacturing a press-formed product according to the first embodiment.

8 is a perspective view showing a press-formed product according to a first modification example of the first embodiment.

9 is a cross-sectional view showing a press-formed product produced by a method for producing a press-formed product according to a second modified example of the first embodiment.

10A is a process diagram illustrating a method of manufacturing a press-formed product according to a second modified example of the first embodiment.

10B is a process diagram illustrating a method of manufacturing a press-formed product according to a second modified example of the first embodiment.

10C is a process diagram illustrating a method of manufacturing a press-formed product according to a second modified example of the first embodiment.

11A is a process diagram illustrating a second working step in the method of manufacturing a press-formed product according to the second embodiment.

11B is a process diagram illustrating a second working step in the method of manufacturing a press-formed product according to the second embodiment.

11C is a process diagram illustrating a second working step in the method of manufacturing a press-formed product according to the second embodiment.

11D is a process diagram illustrating a second working step in the method of manufacturing a press-formed product according to the second embodiment.

12 is a cross-sectional view showing the analysis results of the method for manufacturing a press-formed product according to the invention example, and showing the shape of the inner portion after the second working step.

13 is a cross-sectional view showing the analysis results of the method for manufacturing a press-formed product of a comparative example, and showing the shape of the inner portion after the second working step is completed.

Detailed ways

(first embodiment)

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 to 7 . 1 and 2 show an example of a press-formed product manufactured by the method for producing a press-formed product according to this embodiment. As shown in FIG. 1 , the press-formed product 10 of this embodiment is, for example, a gear, a clutch, or the like attached to a rotating shaft rotatable around a center line L as a transmission member. In addition, in FIG. 1, the functional part as a transmission member, such as the teeth of a gear and the braking surface of a clutch, is omitted. As shown in FIG. 1 , the press-molded product 10 includes a plate-shaped base 20 , a first flange 30 protruding from a first surface 20 a of the base 20 , and a second flange extending from the side opposite to the first surface 20 a of the base 20 . The second flange portion 40 protrudes from the surface 20b. In the present embodiment, the base 20 is formed in a disc shape. The press-formed product 10 has the above-mentioned functional parts of the press-formed product 10 as the target in the base part 20 , but these functional parts are omitted in FIG. 1 .

Moreover, in this embodiment, the 1st flange part 30 and the 2nd flange part 40 protrude from the 1st surface 20a and the 2nd surface 20b of the base part 20, respectively. The first flange portion 30 and the second flange portion 40 are formed in a cylindrical shape along the outer peripheral edge of the base portion 20 and are arranged coaxially with respect to the center line L. As shown in FIG. The outer peripheral surface 30a of the first flange portion 30 and the outer peripheral surface 40a of the second flange portion 40 have substantially the same outer diameter. In other words, the outer peripheral surface 30a of the first flange portion 30 and the outer peripheral surface 40a of the second flange portion 40 are connected to each other linearly along the first direction X. As shown in FIG.

As shown in FIG. 2 , in the present embodiment, the thickness T2 of the second flange portion 40 is thinner than the thickness T1 of the first flange portion 30 . In addition, at the base end 30c of the first flange portion 30, the first flange portion 30 connecting the inner peripheral surface 30b of the first flange portion 30 and the first surface 20a of the base portion 20 and the inner side portion 30d of the base portion 20 are covered. formed in a concave shape. Similarly, at the base end 40c of the second flange portion 40, the second flange portion 40 connecting the inner peripheral surface 40b of the second flange portion 40 and the second surface 20b of the base portion 20 and the inner portion 40d of the base portion 20 are covered. formed in a concave shape. Preferably, the radius of curvature R40 of the inner portion 40d is smaller than the radius of curvature R30 of the inner portion 30d.

Here, the thicknesses T1 and T2 are defined as follows. That is, a line extending toward the first flange portion 30 along the first surface 20a of the base portion 20 is defined as an extension line L21. Moreover, the intersection point of the extension line L21 and the outer peripheral surface 30a of the 1st flange part 30 which faces the side opposite to the base part 20 is defined as the intersection point P31. Furthermore, a line extending toward the base 20 from the inner peripheral surface 30b on the side facing the base 20 of the first flange portion 30 is defined as an extension line L30. Moreover, the intersection point of extension line L30 and extension line L21 is defined as intersection point P32. Furthermore, the distance between the intersection point P31 and the intersection point P32 is defined as the thickness T1 of the first flange portion 30 . In other words, the thickness T1 of the first flange portion 30 is the thickness of the base end 30c of the first flange portion 30 when the inner portion 30d formed in a concave curved shape is removed. In addition, a line extending toward the second flange portion 40 along the second surface 20b of the base portion 20 is defined as an extension line L22. Moreover, the intersection point of the extension line L22 and the outer peripheral surface 40b of the 2nd flange part 40 which faces the side opposite to the base part 20 is defined as the intersection point P41. Furthermore, a line extending from the inner peripheral surface 40 a of the second flange portion 40 facing the base 20 side toward the base 20 is defined as an extension line L40 . Moreover, the intersection point of extension line L40 and extension line L22 is defined as intersection point P42. Furthermore, the distance between the intersection point P41 and the intersection point P42 is defined as the thickness T2 of the second flange portion 40 . In other words, the thickness T2 of the second flange portion 40 is the thickness of the base end 40c of the second flange portion 40 when the inner portion 40d formed in a concave curved shape is removed.

Furthermore, in this embodiment, since the thickness T2 of the second flange portion 40 is thinner than the thickness T1 of the first flange portion 30, the outer peripheral surface 30a of the first flange portion 30 and the outer peripheral surface of the second flange portion 40 The outer diameters of 40 a are substantially equal, so the inner diameter of the inner peripheral surface 30 b of the first flange portion 30 is smaller than the inner diameter of the inner peripheral surface 40 b of the second flange portion 40 . In addition, the details of the structure of the press-formed product 10 have been described above, but as long as the base portion 20, the first flange portion 30, and the second flange portion 40 are provided, other than the first flange portion 30 and the second flange portion Except for the relationship of the thickness of the edge portion 40 , the details of the structure such as the shape of the connection portion between the base portion 20 and the first flange portion 30 and the second flange portion 40 are not limited. Moreover, when the press-formed product 10 is a transmission member etc., the hub part attached to the rotating shaft is provided in the center side of the base part 20, However, It omits in FIG. The hub portion may be formed simultaneously through the processing steps of the present embodiment described below, or may be separately processed to form the shape of the hub portion or attached with a member corresponding to the hub portion.

Next, the manufacturing method of the press-formed article of this embodiment is demonstrated. In addition, as shown in FIG. 1 , the direction in which the first flange portion 30 and the second flange portion 40 of the press-formed product 10 manufactured by the method for manufacturing a press-formed product according to the present embodiment protrudes (protrudes), That is, the thickness direction of the base portion 20 and the direction in which the centerline L of the attached press-formed product 10 extends is defined as the first direction X. Also, with the base portion 20 as a reference, along the first direction X, the side where the first flange portion 30 protrudes is referred to as a first side X1, and the second flange portion 40 is defined as a side opposite to the first side X1. The protruding side is called the second side X2.

FIG. 3 shows a flowchart of a method of manufacturing a press-formed product according to this embodiment. As shown in FIG. 3 , the manufacturing method of the press-formed product 10 according to this embodiment includes a first processing step S1 of forming the first flange portion 30 and a second processing step S2 of forming the second flange portion 40 . The details are described below.

In the first processing step S1 , as shown in FIG. 4 , one sheet of steel plate 11 that is a metal plate formed into a disk shape is used. In the first working step S1 , the outer peripheral portion 11 a of the steel plate 11 is plastically deformed to protrude a portion serving as the first flange portion 30 toward the first side X1 in the first direction X serving as the thickness direction of the steel plate 11 . Various well-known methods can be applied as the processing method of plastic deformation, for example, drawing processing and flanging processing are used. In the first working step S1 of the present embodiment, drawing is performed. That is, as shown in FIG. 5A, the steel plate 11 is sandwiched between the backing plate 100 arranged on the first side X1 of the first direction X of the steel plate 11 and the backing plate 101 arranged on the second side X2 of the first direction X of the steel plate 11. between. And, as shown in FIG. 5B , the punch 102 enters the outer peripheral portion 11 a of the steel plate 11 from the first direction X, the second side X2 toward the first side X1, so that the outer peripheral portion 11 a of the steel plate 11 faces the first direction X. The first side X1 protrudes, forming a portion 31 as a first flange portion. FIG. 6 shows the intermediate product 12 formed by performing the first processing step S1. The intermediate product 12 is formed of the steel plate 11 as described above, and includes the base portion 21 and the first flange portion 31 . In the first processing step S1, the thickness T31 of the portion 31 as the first flange portion may be different from the thickness T1 of the first flange portion 30 of the press-formed product 10 as a finished product.

Here, the corner portion 100a of the backing plate 100 is formed in a convexly curved shape. Therefore, in the connection portion between the portion 31 serving as the first flange portion and the portion 21 serving as the base portion through the first processing step S1, the corner portion 12a connecting the portion 31 serving as the first flange portion and the portion 21 serving as the base portion It extends in a curved shape in a cross-sectional view along the center line L. Then, the radius R (mm) of the curved outer side of the corner 12a in the cross section of the corner 12a along its extending direction, that is, the radius of curvature of the outer peripheral surface of the corner 12a, and the second processing step S2 described later are performed. The ratio of the thickness T2 (mm) of the subsequent second flange portion 40 to the thickness T1 (mm) of the first flange portion 30 is formed so as to satisfy the following relational expression.

R×T2/T1<3.5...(1)

Next, the second processing step S2 is implemented. In the second processing step S2, the first flange portion 30 and the second flange portion 30 are formed by plastically deforming the portion 31 of the intermediate product 12 to flow the material of the portion 31 of the first flange portion. Two flange parts 40 . Here, in the second processing step S2, a processing apparatus 110 as shown in FIG. 7A is used. As shown in FIG. 7A , the processing device 110 includes a first backing plate 120 , a second backing plate 130 , a third backing plate 140 , and a punch 150 .

The first backing plate 120 is formed in a cylindrical shape extending along the first direction X. As shown in FIG. The outer peripheral surface 120 a of the first backing plate 120 is formed in a linear shape along the center line L. As shown in FIG. The first backing plate 120 is arranged along the inner peripheral surface 31b of the portion 31 serving as the first flange portion of the intermediate product 12 provided in the processing device 110 as will be described later. In this embodiment, in the state where the intermediate product 12 is installed in the processing apparatus 110, the outer peripheral surface 120a of the 1st backing plate 120 is in contact with the part 31 which is a 1st flange part. Furthermore, the first backing plate 120 abuts against the portion 21 which is the base. In the first backing plate 120, the lower surface 120b in contact with the portion 21 serving as the base and the outer peripheral surface 120a are connected by a convex curved surface 120c. The radius of curvature of the convex curved surface 120c corresponds to the inner portion of the first flange portion 30 and the base portion 20 connecting the inner peripheral surface 30b of the first flange portion 30 and the first surface 20a of the base portion 20 of the press-molded product 10 after molding. The radius of curvature R30 corresponds to 30d.

The second backing plate 130 is a cylindrical member. The second backing plate 130 is coaxial with the first backing plate 120 with respect to the center line L, and is arranged with a gap on the radially outer peripheral side of the first backing plate 120 . The inner peripheral surface 130a of the second backing plate 130 is formed in a linear shape along the first direction X. As shown in FIG. The inner peripheral surface 130a of the second backing plate 130 is arranged along the outer peripheral surface 31a of the portion 31 serving as the first flange portion of the intermediate product 12 installed in the processing device 110 as will be described later. In this embodiment, in the state where the intermediate product 12 is installed in the processing apparatus 110, the inner peripheral surface 130a of the 2nd backing plate 130 is in contact with the part 31 which is a 1st flange part. The distance D1 between the inner peripheral surface 130 a of the second backing plate 130 and the outer peripheral surface 120 a of the first backing plate is approximately equal to the thickness T1 of the first flange portion 30 . In addition, the thickness T31 of the first flange portion of the intermediate product 12 may be greater than the distance D1 before the second processing step S2 and the thickness T1 of the first flange portion 30 after the second processing step S2. Small. The second backing plate 130 sandwiches the first backing plate 120 and the portion 31 serving as the first flange portion along the first direction X, and extends to a range where the second flange portion 40 is formed. In this embodiment, the inner peripheral surface 130a of the second backing plate 130 is formed in a linear shape along the first direction X. As shown in FIG.

The third backing plate 140 is a cylindrical member. The third backing plate 140 is disposed on the radially inner peripheral side of the second backing plate 130 so as to be coaxial with the first backing plate 120 and the second backing plate 130 with respect to the center line L. As shown in FIG. The outer peripheral surface 140a of the third backing plate 140 is formed in a linear shape along the center line L. As shown in FIG. In the present embodiment, the third backing plate 140 is arranged along the inner peripheral surface 40 b of the second flange portion 40 of the press-formed product 10 in a state where the intermediate product 12 is installed in the processing device 110 . In addition, the third backing plate 140 abuts against the base portion 21 and sandwiches the base portion 21 together with the first backing plate 120 . The distance D2 between the outer peripheral surface 140 a of the third backing plate 140 and the inner peripheral surface 130 a of the second backing plate 130 is substantially equal to the thickness T2 of the second flange portion 40 . The third backing plate 140 sandwiches the second flange portion 40 formed in the second processing step S2 between the second backing plate 130 and the second backing plate 130 along the first direction X. In the third backing plate 140, an upper surface 140b in contact with the portion 21 serving as a base and an outer peripheral surface 140a are connected by a convex curved surface 140c. The radius of curvature of the convex curved surface 140c corresponds to the inner side of the second flange portion 40 and the base portion 20 connecting the inner peripheral surface 40a of the second flange portion 40 and the second surface 20b of the base portion 20 of the press-molded product 10 after molding. The radius of curvature R40 of the portion 40d. Also, in a cross section along the center line L, it is preferable that the radius of curvature of the convex curved surface 140c is smaller than the radius of curvature of the convex curved surface 120c.

The punch 150 is a cylindrical member. The punch 150 is arranged between the first backing plate 120 and the second backing plate 130 so as to be coaxial with the first backing plate 120 and the second backing plate 130 with respect to the center line L. The punch 150 can advance and retreat in the first direction X. In addition, although not shown, the third backing plate 140 is fixed to the device main body. In addition, although not shown in the figure, the punch 150 is given an operating force by a hydraulic device or the like provided in the main body of the device. Thus, with respect to the front end surface 31c of the portion 31 serving as the first flange portion in the intermediate product 12 sandwiching the portion 21 serving as the base between the first backing plate 120 and the third backing plate 140, the distance from the first direction Xth One side X1 enters toward the second side X2, and further, the front end surface 31c of the portion 31 as the first flange portion is pushed toward the second side X2, thereby applying an external force to the portion 31 as the first flange portion.

In such a processing apparatus 110 , as shown in FIG. 7A , an intermediate product 12 is provided. Specifically, in the intermediate product 12 , the base portion 21 is arranged between the first backing plate 120 and the third backing plate 140 . In addition, the centerline of the intermediate product 12 coincides with the centerline L. As shown in FIG. In addition, the part 31 which is a 1st flange part is arrange|positioned so that it may extend toward the punch 150. As shown in FIG. And the part 21 which is a base part is sandwiched and pressed by the 1st backing board 120 and the 3rd backing board 140. As shown in FIG. In addition, in this state, the portion 31 that is the first flange portion is sandwiched between the first backing plate 120 and the second backing plate 130 .

Next, as shown in FIG. 7B , the punch 150 is moved toward the first direction X and the second side X2. When the punch 150 enters, first, the punch 150 comes into contact with the front end surface 31c of the portion 31 that is the first flange portion. As shown in FIG. 7C , when the punch 150 enters, an external force is applied from the punch 150 from the first side X1 toward the second side X2 in the first direction X to the portion 31 that is the first flange portion. Therefore, the portion 31 as the first flange portion is plastically deformed between the first backing plate 120 and the second backing plate 130, and the material of the portion 31 as the first flange portion faces from the first direction X to the first side X. The second side X2 flows to a range serving as the second flange portion 40 to form the second flange portion 40 . Here, as shown in FIG. 7B, in the initial stage of the second processing step S2, since the front end surface 31c of the portion 31 as the first flange portion is pressed, the portion 21 as the base portion and the portion 21 as the first flange portion are pressed. The corner portion 12 a formed by the portion 31 is to be plastically deformed to fall within the range as the second flange portion 40 . However, by processing so that the thickness T2 of the second flange portion is smaller than the thickness T1 of the first flange portion 30 after the second processing step S2 and satisfies the expression (1), the corner portion 12a can be suppressed It falls into the range that is the second flange portion 40 . Therefore, in the second processing step S2, it is possible to suppress the defect of an acute-angled tuck-in shape at the inner portion 30d of the corner portion 12a due to the fall of the corner portion 12a, and to form the second flange portion in the second processing step S2. 40.

And, as shown in FIG. 7D , by moving the punch 150 by a predetermined amount to the first direction X and the second side X2, the first flange portion 30 can be made to have a predetermined length, and the second flange portion 40 can be made to have a predetermined length. The length protrudes from the base 20 to the first direction X and the second side X2 to complete the stamped product 10 .

As described above, according to the method of manufacturing the press-formed product 10 of the present embodiment, in the second processing step S2, the thickness T2 of the second flange portion 40 is set to be smaller than that of the first flange portion after the second processing step S2. In such a manner that the thickness T1 of the edge portion 30 is small and the above formula (1) is satisfied, in the second processing step S2, the front end surface 31c of the portion 31 serving as the first flange portion is pressed and plastically deformed, thereby enabling The second flange portion 40 can be formed while suppressing the defect of an acute-angled tuck-in shape being formed in the inner portion 30d. That is, only by performing the two steps of the first working step S1 and the second working step S2, it is possible to manufacture from one steel plate 11 a part having protruding parts on both sides without forming an acute-angled tuck-in defect in the inner part 30d. Stamping products 10.

In addition, as shown in FIG. 7A , after the implementation of the second processing step S2 , the plane PL140 including the outer peripheral surface 140 a along the second flange portion 40 in the third backing plate 140 is different from that of the first backing plate 140 . In 120, the plane PL120 including the outer peripheral surface 120a along the first flange portion 30 is located on the first flange in a direction orthogonal to the outer peripheral surface 140a (a radial direction orthogonal to the first direction X). part 30 side. In other words, after the second processing step S2 is performed, the plane PL140 of the third backing plate 140 including the outer peripheral surface 140 a along the second flange portion 140 passes through the inside of the first flange portion 30 . Therefore, especially in the corner portion 12a, material on the side of the third backing plate 140 is suppressed from falling into the gap between the third backing plate 140 and the second backing plate 130, and it is possible to further suppress a fold forming an acute angle at the inner portion 30d of the corner portion 12a. entry defects.

In addition, in the second processing step S2, the inner peripheral surface 130a of the second backing plate 130 along the first flange portion 30 and the second flange portion 40 is formed linearly along the first direction X. Therefore, in particular, material on the third backing plate 140 side of the corner portion 12a is suppressed from falling into the gap between the third backing plate 140 and the second backing plate 130, and it is possible to further suppress a fold forming an acute angle at the inner portion 30d of the corner portion 12a. entry defects. Moreover, the outer peripheral surfaces 30a, 40a which are different in thickness T1, T2 from each other and connected linearly can be formed by the 1st flange part 30 and the 2nd flange part 40.

In addition, in the second processing step S2, in a section along the center line L, the curvature radius of the convex curved surface 140c of the third backing plate 140 is set to be equal to the curvature radius of the convex curved surface 120c of the first backing plate 120 of the processing device 110. The radius is smaller. That is, as the press-formed product 10, the radius of curvature R40 of the inner portion 40d is formed to be smaller than the radius of curvature R30 of the inner portion 30d, thereby further suppressing the defect that the inner portion 30d of the corner portion 12a forms an acute angle.

In addition, in the present embodiment, with regard to the disc-shaped sheet of steel plate 11, in the first processing step S1, the portion on the outer peripheral edge side is plastically deformed to form the portion 31 as the first flange portion, and in the second processing step S2 Although the first flange portion 30 and the second flange portion 40 are formed by pressing and plastically deforming the front end surface 31c of the portion 31 serving as the first flange portion, the present invention is not limited thereto. It is not limited to the steel plate, and can be applied to metal plates of various materials as long as it is a metal material that can be plastically worked.

In addition, the shape of the metal plate is not limited to a disc shape, and various shapes can be applied. In addition, the shapes of the first flange portion 30 and the second flange portion 40 are not limited to the above-mentioned continuous cylindrical shape around the center line L, and the first flange may be formed as a flat plate. The portion and the second flange protrude from the base respectively. FIG. 8 shows a first modified example of this embodiment. As shown in FIG. 8 , a press-formed product 10A of this modified example includes a rectangular plate-shaped base portion 20A, a first flange portion 30A protruding from a first surface 20Aa of the base portion 20A, and a first flange portion 30A protruding from the first surface 20Aa of the base portion 20A. The second flange portion 40A protrudes from the second surface 20Ab on the opposite side. The first flange portion 30A protrudes toward the first side X1 in the first direction X from a pair of opposing sides of the rectangular base portion 20A. The first flange portion 30A is formed in a rectangular flat plate shape. Further, the second flange portion 40A protrudes toward the second side X2 in the first direction X from a pair of sides of the base portion 20A protruding from the first flange portion 30A. The second flange portion 40A is formed in a rectangular flat plate shape. In such a modified example, the thickness T2 of the second flange portion 40A may be smaller than the thickness T1 of the first flange portion 30A, and the portion serving as the first flange portion 40A may be the same as the portion serving as the first flange portion 40A in the first processing step S1. The relationship between the outer radius R of the corner portion 12Aa at the connection portion of the base portion 20A, and the thickness T1 of the first flange portion 30A and the thickness T2 of the second flange portion 40A satisfies the above-mentioned formula (1). In this way, in the press-formed product 10A of this modified example, also in the second processing step S2, the front end surface of the portion serving as the first flange portion 30A can be pressed and plastically deformed, and the formation of an acute angle at the inner portion can be suppressed. Fold-in defects are eliminated, and the second flange portion 40A can be formed.

In addition, in the present embodiment, the outer peripheral surface 30 a of the first flange portion 30 and the outer peripheral surface 40 a of the second flange portion 40 are formed in a straight line when viewed in a direction perpendicular to the center line L (that is, in the radial direction). Shape, approximately the same outer diameter, but not limited to. For example, the outer diameter of the outer peripheral surface 40 a of the second flange portion 40 may be made smaller than the outer diameter of the outer peripheral surface 30 a of the first flange portion 30 . In addition, for example, at least one of the outer peripheral surfaces of the first flange portion 30 and the second flange portion 40 may be formed such that the outer diameter gradually becomes smaller along the first direction X from the distal end side toward the proximal end side. And formed into a cone shape. In this case, it is only necessary to make at least the thickness T2 of the second flange portion 40 smaller than the thickness T1 of the first flange portion 30 . By appropriately changing the shape of the second backing plate 130 according to the shapes of the first flange portion and the second flange portion, it is possible to form the first flange portion and the second flange portion of a desired shape. In addition, in the case of forming a tapered shape, as shown in FIG. 2, the distance between the intersection point P31 and the intersection point P32 can be defined as the thickness T1, The distance between the intersection point P41 and the intersection point 42 may be defined as the thickness T2.

In addition, the first flange portion 30B and the second flange portion 40B may be formed on the center side of a metal plate such as the above-mentioned steel plate. 9 and 10 ( FIGS. 10A to 10C ) show a second modified example of the present embodiment. As shown in FIG. 9 , the press-formed product 10B of this modified example includes a disk-shaped base 20B, a first flange 30B protruding toward the first side X1 in the first direction X at the center side of the base 20B, and The center side of 20B protrudes toward the second side X2 of the first direction X and the second flange portion 40B. The first flange portion 30B is formed in a cylindrical shape in this modified example. In addition, the 2nd flange part 40B is formed in cylindrical shape also in this modification. The first flange portion 30B and the second flange portion 40B are arranged coaxially with respect to the center line L. As shown in FIG. The hole formed inside the first flange portion 30B and the hole formed inside the second flange portion 40B communicate with each other. In this modified example, the inner diameters of the inner peripheral surface of the first flange portion 30B and the inner peripheral surface of the second flange portion 40B are substantially equal and continuous, and are formed in a straight line.

Such a press-formed product 10B is formed from a metal plate 11B in which a through-hole 11 b is formed at the center, as shown in FIG. 10A . As shown in FIG. 10B , first, in the first processing step S1 , plastic processing is performed around the through-hole 11 b of the disk-shaped metal plate 11B, so that the portion 31B serving as the first flange portion can be formed from the The portion 21B serving as the base protrudes toward the first direction X to the first side X1. As a method of plastic working, various well-known methods can be applied, for example, burring processing can be mentioned. That is, by sandwiching the base portion 21B between the backing plates 100B and 101B, the cylindrical punch 102B enters from the first direction X and the second side X2 toward the first side X1 of the base portion 21B, thereby enabling the A portion around the through hole 11 b is plastically deformed to form a portion 31B as a first flange portion. At this time, the corner portion 12Ba connecting the base portion 21B and the first flange portion 31B is formed in a curved shape in a cross section along the center line L according to the shape of the corner portion of the backing plate 100B.

Then, as shown in FIG. 10C, in the second processing step S2, the front end surface 31Bc of the portion 31B as the first flange portion is pressed with a punch 150B, and the portion 31B as the first flange portion is pressed as in the above-mentioned embodiment. Portion 31B is plastically deformed. Specifically, the portion 21B serving as the base is sandwiched and pressed by the first backing plate 120B and the third backing plate 140B. In addition, the portion 31B that is the first flange portion is arranged between the first backing plate 120B and the third backing plate 130B. Then, by entering the punch 150B between the first backing plate 120B and the third backing plate 130B from the first side X1 to the second side X2 in the first direction X, the portion 31B serving as the first flange portion is pressed. Front end surface 31Bc. Here, also in this modified example, the thickness T2 of the second flange portion 40B is made smaller than the thickness T1 of the first flange portion 30B after the second processing step S2 is performed, and the radius R of the outer side of the corner portion 12Ba is made smaller. The above formula (1) is satisfied in relation to the thickness T1 of the first flange portion 30B and the thickness T2 of the second flange portion 40B. Thereby, it is possible to suppress the defect that an acute-angled tuck-in shape is formed in the inner portion 30Bd connecting the base portion 20B and the first flange portion 30B.

In addition, in the above-mentioned embodiment, the first flange portion 30 and the second flange portion 40 are formed on the outer peripheral side of the metal plate, and in the second modified example, the first flange portion 30B and the first flange portion 30B are formed on the center side of the metal plate. As for the second flange portion 40B, the first flange portion and the second flange portion may be formed on both the center side and the outer peripheral edge side of the metal plate. In this case, the first processing step S1 and the second processing step S2 may be performed on the center side and the outer peripheral side of the metal plate, respectively, or each of the first processing steps S1 may be performed simultaneously using a mold having a shape that can be performed simultaneously. And each second processing step S2. In addition, in the above-mentioned embodiments and modifications, the first processing step S1 and the second processing step S2 have been described, but they are not limited to performing only these steps, and other plastic working steps and cutting steps may be carried out. Or other processes such as the process of performing surface treatment.

(second embodiment)

Next, a second embodiment of the present invention will be described. FIG. 11 is a diagram showing a second embodiment of the present invention. In this embodiment, the same reference numerals are assigned to the same components as those used in the above-mentioned embodiment, and description thereof will be omitted.

In the manufacturing method of the press-formed article of this embodiment, the 2nd processing process S2 differs compared with 1st Embodiment. That is, as shown in FIG. 11A , in the press working apparatus 110C of the second working step S2 of this embodiment, in addition to the first backing plate 120 , the second backing plate 130 , the third backing plate 140 , and the punch 150 , there are also A fourth backing plate 160 is provided. In this embodiment, the fourth backing plate 160 is a cylindrical member. The fourth backing plate 160 is disposed on the second side X2 in the first direction X, that is, on the side opposite to the punch 150 , across the portion 31 serving as the first flange portion. The fourth backing plate 160 is arranged between the second backing plate 130 and the third backing plate 140 and is coaxially arranged with respect to the center line L thereof. The fourth backing plate 160 is provided so as to be able to advance and retreat in the first direction X. As shown in FIG. In addition, the fourth backing plate 160 enters from the second side X2 in the first direction X toward the first side X1 through a hydraulic device (not shown), so that the corner 12 a of the intermediate product 12 can face toward the first side in the first direction X. X1 applies an external force.

In addition, as shown in FIG. 11B , in the second processing step S2 of the present embodiment, first, the fourth backing plate 160 is brought into contact with the corner portion 12 a in the first direction X first side X1 . Then, at the timing when the punch 150 starts pressing the front end surface 31c of the portion 31 as the first flange portion toward the second side X2 in the first direction X, the fourth backing plate 160 pushes the corner portion 12a toward the second side X2 in the first direction. One side X1 pushes, and an external force is applied to the corner 12 a of the intermediate product 12 from the first direction X and the second side X2 toward the first side X1 . The magnitude of the external force applied to the intermediate product 12 by the fourth backing plate 160 is smaller than the magnitude of the external force applied to the intermediate product 12 by the punch 150 . And, as shown in FIG. 11C , the part 31 that is the first flange part is plastically deformed by the punch 150, and the material tends to flow to the range that is the second flange part 40. On the other hand, the fourth backing plate 160 faces toward the second flange part 40. The intermediate product 12 moves from the first side X1 in the first direction X toward the second side X2 while applying an external force. The external force applied to the intermediate product 12 by the fourth backing plate 160 may be applied until the formation of the second flange portion 40 is completed, or may be released at a timing until the middle of the formation of the second flange portion 40 as shown in FIG. 11D . .

As described above, according to the manufacturing method of the press-formed product of this embodiment, at least On the way, an external force is applied from the first direction X, the second side X2 toward the first side X1 to the corner portion 12a connected to the portion 31 as the first flange portion in the portion 21 as the base. By plastically deforming the portion 31 that is the first flange portion, stress is generated in the materials of the first flange portion 30 and the base portion 20 connected to the first flange portion, so that the material of the base portion 20 is pushed toward the first direction of the base portion 20 . X second side X2 plastic flow. However, in the process of making the material of the portion 31 as the first flange portion flow toward the second side X2 in the first direction X and at least halfway through the completion of the processing, the first The external force applied from the side X1 can suppress the plastic flow from the portion 21 as the base to the second side X2 in the first direction X. Therefore, it is possible to suppress the plastic flow of the material from both the base portion 21 and the first flange portion 31 to the first direction X and the second side X2 to connect the base portion 20 and the first flange portion 30 inside. An acute-angled tuck-in defect is formed in portion 30d. And, from the beginning of the process of making the material of the portion 31 as the first flange portion flow toward the second side X2 in the first direction X, after a certain amount of deformation caused by the process is generated, the material of the portion 31 as the first flange portion is then applied to the second side X2 as the first flange portion. The pressing force of the front end surface 31c of the portion 31 of the first flange portion deforms the portion generated during the deformation toward the first direction X and the second side X2, thereby suppressing the occurrence of an acute-angled tuck-in defect and forming the second Two flange parts 40 .

Example

Next, an example of the method for manufacturing a press-formed product according to the above-mentioned first embodiment will be described based on FIGS. 1 to 7 , and FIGS. 12 and 13 . Specifically, for a press-formed product 10 as shown in FIG. While changing the outer radius R of the corner portion 12a before the step S2, whether or not an acute-angled tuck-in defect occurred in the inner portion 30d in each shape was checked. Confirmation was performed by analysis based on the finite element method. As the material of the steel sheet 11, SAPH440 specified in JIS G 3113 (Hot-rolled steel sheet and steel strip for automobile structure) was used.

Then, as the shape of the intermediate product 12 before the second processing step S2 is performed, molding is performed so as to correspond to each of thicknesses T1 = 4 mm and 6 mm described later. As shown in FIG. 6 , regarding the portion 31 as the first flange portion, the height H31 protruding from the first surface 21 a of the portion 21 as the base toward the first side X1 in the first direction X is set to 40 mm. In addition, in the intermediate product 12 corresponding to the thickness T1 = 4mm, the diameter of the inner peripheral surface 31b of the portion 31 serving as the first flange portion is set to 80mm, the diameter of the outer peripheral surface 31a is set to 88mm, and the thickness T31 is set to is 4mm. In addition, in the intermediate product 12 corresponding to the thickness T1 = 6mm, the diameter of the inner peripheral surface 31b of the portion 31 serving as the first flange portion is set to 80mm, the diameter of the outer peripheral surface 31a is set to 92mm, and the thickness T31 is set to is 6mm. The radius R of the outer side of the corner portion 12a is set at 0.1 mm and a value varying by 0.5 mm in the range of 0.5 to 6.0 mm.

Then, the second processing step S2 is implemented. In both the inventive example and the comparative example, the front end surface 31c of the part 31 serving as the first flange part was pressed by the punch 150 with a load of 4000kN to plastically deform it, and the front end surface 31c of the part 21 serving as the base part was formed to be formed from the second surface 21b of the part 21 serving as the base to the first flange part. A second flange portion 40 protruding from one direction X to the second side X2. The second flange portion 40 has a height H40 (see FIG. 1 ) extending from the second surface 20b of the base portion 20 toward the second side X2 in the first direction X to 10 mm. In addition, the thickness T1 of the 1st flange part 30 was set to two types, 4 mm and 6 mm. In the case of thickness T1 = 4.0 mm, the thickness T2 of the second flange portion 40 is changed to 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0 mm, thereby changing the plate thickness ratio T2/T1 to 0.25 , 0.38, 0.50, 0.63, 0.75, 0.88, 1.0. In addition, in the case of thickness T1 = 6.0 mm, the thickness T2 of the second flange portion 40 is changed to 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, and 6.0 mm, thereby making the plate thickness ratio T2/T1 changes were 0.33, 0.42, 0.50, 0.58, 0.67, 0.75, 0.83, 0.92, 1.00. Then, the radius R of the corner portion 12a is changed as described above at each plate thickness ratio T2/T1, and whether or not an acute angle does not occur at the inner portion 30d connecting the first flange portion 30 and the base portion 20 in each of them is performed. confirmation of defects.

Analysis results are shown in FIGS. 12 and 13 and Tables 1 and 2. Table 1 is a table of the plate thickness ratio T2/T1 and the radius R of the outer side of the corner portion 12 a when T1 = 4.0 mm. In addition, Table 2 is a table of the plate thickness ratio T2/T1 and the radius R outside the corner portion 12 a when T1 = 6.0 mm. In each cell of Table 1 and Table 2, the value of R×T2/T1 calculated from the formula (1) under each analysis condition is shown. In each cell, under the condition that the value of R×T2/T1 is underlined (comparative example), as shown in FIG. 13 , it can be seen from the analysis results that an acute-angled fold-in defect D is formed on the inner portion 30d. . That is, from the analysis results, it is found that when T2/T1 is 1 or more (T2 is the same as T1 or T2 is larger than T1), the defect D is formed irrespective of the value of R×T2/T1. In addition, according to the analysis results, even if the plate thickness ratio T2/T1 is less than 1 (T2 is smaller than T1), the defect D is formed when the value of R×T2/T1 is 3.5 or more. In addition, under the condition that each cell is not underlined (invention example), as shown in FIG. 12 , no sharp-edged defect D can be seen in the inner portion 30d, and can be formed in a smooth concave curve shape. That is, the plate thickness ratio T2/T1 is less than 1.00 (T2 is smaller than T1), and the value of R×T2/T1 calculated by the formula (1) is less than 3.5, so that through the first processing step S1 and the second processing step S2, The smooth concave curve-shaped inner portion 30d can be formed without forming the fold-in defect D, and the first flange portion 30 and the second flange portion 40 can be formed.

【Table 1】

【Table 2】

The embodiments and examples of the present invention have been described above in detail with reference to the drawings, but the specific configuration is not limited to the embodiments, and design changes and the like within the scope of the present invention are also included.

Industrial availability

It is possible to provide a method of manufacturing a press-formed product, by which a metal plate can be produced from a single sheet of metal with fewer steps without causing a defect of being folded in at an acute angle at an inner portion protruding like a flange. A press-formed product having portions protruding in a flange shape on both sides is manufactured. Accordingly, industrial applicability is high.

Label description

10, 10A, 10B stamped products; 11, 11B steel plate (metal plate); 12a, 12Ba corner; 20, 20A, 20B base; 21c connection part; 30, 30A, 30B first flange part; 40B second flange part; 120, 120B first backing plate; 130, 130B second backing plate; 140, 140B third backing plate; 150, 150B punch; S1 first processing procedure; S2 second processing procedure; R Radius of the outside of the corner; T1 thickness of the first flange portion; T2 thickness of the second flange portion; X first direction; X1 first side; X2 second side.

Claims (5)

1. A method for manufacturing a press-formed article,

forming a first flange portion extending toward a first side in a first direction, which is a thickness direction of a plate-like base portion, by plastically deforming a part of a single metal plate, and forming a corner portion extending in a curved shape between the base portion and the first flange portion;

disposing a first pad along the first flange portion;

disposing a second pad on the opposite side of the first pad with the first flange portion interposed therebetween;

a third pad is disposed on the opposite side of the first flange portion with the base portion interposed therebetween so as to form a gap with the second pad smaller than a gap between the first pad and the second pad;

a punch is disposed between the first pad and the second pad so as to be movable in a first direction, and the punch pushes a distal end surface of the first flange portion formed on a first side in the first direction;

a second flange portion extending toward the first direction second side with respect to the base portion by pressing the distal end surface of the first flange portion toward the first direction second side so that the material of the first flange portion flows toward the first direction second side;

The thickness T2 of the second flange portion is smaller than the thickness T1 of the first flange portion after the second flange portion is formed;

the ratio of the thickness T2 of the second flange portion after the formation of the second flange portion to the thickness T1 of the first flange portion is mm, and the radius R of the outside of the bend of the corner portion in a cross section of the corner portion in the extending direction after the formation of the corner portion is mm, that is, r×t2/T1 is less than 3.5.

2. The method for producing a press-molded article according to claim 1,

the third pad includes a plane including a surface along the second flange after the second flange is formed, and is located on the first flange side in a direction orthogonal to the surface along the first flange with respect to a plane including a surface along the first flange in the first pad.

3. The method for producing a press-molded article according to claim 2,

the second pad is formed in a linear shape along the first direction along the surfaces of the first flange portion and the second flange portion.

4. The method for producing a press-molded article according to claim 1 or 2,

when forming the second flange portion, the first flange portion is plastically deformed while applying an external force from the first direction second side of the connecting portion connected to the first flange portion in the base portion to the first direction first side on the way to completion of the processing, from the start of the processing in which the material of the first flange portion flows to the first direction second side by pressing the tip end surface of the first flange portion formed on the first direction first side to the first direction second side.

5. The method for producing a press-molded article according to claim 3,

when forming the second flange portion, the first flange portion is plastically deformed while applying an external force from the first direction second side of the connecting portion connected to the first flange portion in the base portion to the first direction first side on the way to completion of the processing, from the start of the processing in which the material of the first flange portion flows to the first direction second side by pressing the tip end surface of the first flange portion formed on the first direction first side to the first direction second side.

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