WO2015133464A1 - プレス成形品の製造方法、プレス成形品の製造装置、マンドレル、及びプレス成形品 - Google Patents
プレス成形品の製造方法、プレス成形品の製造装置、マンドレル、及びプレス成形品 Download PDFInfo
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- WO2015133464A1 WO2015133464A1 PCT/JP2015/056184 JP2015056184W WO2015133464A1 WO 2015133464 A1 WO2015133464 A1 WO 2015133464A1 JP 2015056184 W JP2015056184 W JP 2015056184W WO 2015133464 A1 WO2015133464 A1 WO 2015133464A1
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- press
- formed product
- intermediate press
- manufacturing apparatus
- long material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D7/00—Bending rods, profiles, or tubes
- B21D7/06—Bending rods, profiles, or tubes in press brakes or between rams and anvils or abutments; Pliers with forming dies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
- B21D22/22—Deep-drawing with devices for holding the edge of the blanks
- B21D22/225—Deep-drawing with devices for holding the edge of the blanks with members for radially pushing the blanks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
- B21D22/26—Deep-drawing for making peculiarly, e.g. irregularly, shaped articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
- B21D35/002—Processes combined with methods covered by groups B21D1/00 - B21D31/00
- B21D35/005—Processes combined with methods covered by groups B21D1/00 - B21D31/00 characterized by the material of the blank or the workpiece
- B21D35/006—Blanks having varying thickness, e.g. tailored blanks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D47/00—Making rigid structural elements or units, e.g. honeycomb structures
- B21D47/01—Making rigid structural elements or units, e.g. honeycomb structures beams or pillars
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
- B21J5/08—Upsetting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K23/00—Making other articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards
Definitions
- the present invention relates to a method for manufacturing a press-formed product, a manufacturing apparatus for a press-formed product, a mandrel, and a press-formed product.
- This application includes Japanese Patent Application No. 2014-042144 filed in Japan on March 4, 2014, Japanese Patent Application No. 2014-057177 filed in Japan on March 19, 2014, and Japanese Patent Application No. 2014-057177 filed on October 10, 2014. Claiming priority based on Japanese Patent Application No. 2014-209361 filed in Japan, the contents of which are incorporated herein by reference.
- Automobiles are required to be lighter in weight to improve fuel efficiency, while high rigidity is required to ensure steering stability and the like.
- a press-formed product obtained by press-forming a steel plate is used for a part of the skeleton member of the vehicle body.
- the rigidity decreases. Therefore, in order to reduce the weight and increase the rigidity of the press-formed product, it has been studied to increase the thickness of a part of the press-formed product.
- Patent Document 1 discloses a method for manufacturing a vehicle part using a tailored blank material. Further, a steel plate (reinforcing material) is welded to the skeleton member of the vehicle body to partially increase the thickness.
- the tailored blank material is manufactured by welding steel plates having different tensile strengths or steel plates having different plate thicknesses.
- this tailored blank material is press-molded, stress concentrates on the welded portion, and there is a risk of cracking or breaking.
- production efficiency may be reduced.
- the present invention has been made in view of the above circumstances, and there is no need for welding, and a press-molded product manufacturing method, press-molded product manufacturing apparatus, mandrel, An object is to provide a press-formed product.
- the manufacturing method of the press-formed product according to the first aspect of the present invention includes: a first step of preparing a long material having a bent portion; and restraining both ends in the longitudinal direction of the long material, A second step of reducing the curvature of the bent portion.
- the curvature may be reduced while keeping the shortest distance between the both ends of the long material constant.
- the curvature may be reduced while the shortest distance between the both ends of the long material is reduced.
- the curvature in the second step, is reduced while supporting at least the concave side of the bent portion of the long material. May be.
- the curvature may be reduced stepwise in the second step.
- planes including the edges of the both ends of the long material may be parallel to each other.
- a device for manufacturing a press-formed product according to a second aspect of the present invention is a device for manufacturing a press-formed product from a long material having a bent portion, and is provided on the base portion and the base portion. And a first molding die having a pair of constraining walls that are opposed to each other at both ends in the longitudinal direction of the long material; and a convexity of the bent portion of the long material inserted between the pair of constraining walls A second molding die having a punch portion for pressing the side, and a distance between the pair of constraining walls is smaller than a total length when the long material is linearly extended.
- a distance between the pair of constraining walls may be equal to a shortest distance between both ends in the longitudinal direction of the long material.
- each of the pair of restraint walls is arranged in the longitudinal direction of the long material when the long material is inserted between the restraint walls.
- a curved guide surface with which the end abuts may be provided.
- a wrinkle holding jig may be further provided.
- one of the pair of constraint walls may be a fixed constraint wall fixed to the base portion; the other of the pair of constraint walls is the punch portion It may be a pressure restraint wall that approaches the fixed restraint wall when it is moved while being brought into contact with the convex side of the bent portion of the long material.
- at least one of the fixed restraint wall and the pressure restraint wall includes a workpiece receiving portion that contacts one end of the long material, You may have the elastic body biased toward the said one end of a scale material.
- the support is disposed between the fixed restraint wall and the pressure restraint wall and contacts at least the concave side of the bent portion of the long material.
- a wrinkle holding jig having a surface may be further provided.
- a mandrel according to a third aspect of the present invention is a mandrel for use in the apparatus for manufacturing a press-formed product according to any one of (7) to (13) above, and A plurality of divided bodies that support the concave side; and a connecting body that connects the divided bodies, and the arrangement of the divided bodies changes according to the shape of the bent portion of the long material. .
- each of the divided bodies is inserted into a concave portion that houses the connecting body when the divided bodies are arranged in a row, a bottom surface of the concave portion, and the concave portion. And an elastic body provided between ends of the connecting body.
- each of the coupling bodies is provided between a pair of divided coupling bodies that can approach and separate from each other within a predetermined range, and the pair of divided coupling bodies, and the pair of divided bodies. And an elastic body that urges the connecting bodies in a direction in which they are separated from each other.
- the press-formed product according to the fourth aspect of the present invention is a press-formed product that is long in one direction, and has a high cross-sectional area having the largest cross-sectional area when viewed in a cross section perpendicular to the longitudinal direction; A low cross-sectional area portion having a smaller cross-sectional area than the high cross-sectional area portion; an intermediate portion provided between the high cross-sectional area portion and the low cross-sectional area portion and the cross-sectional area continuously changing along the longitudinal direction And a section.
- the high cross-sectional area portion may be provided at a plurality of locations along the longitudinal direction.
- the long material is compressed in the longitudinal direction. can do. That is, since the compressed part becomes surplus, the cross-sectional area of the long material can be increased. Therefore, the rigidity of the long material can be increased.
- the yield strength can be increased by work hardening of the long material.
- the cross-sectional area of the part corresponding to a bending part increases, the cross-sectional area of a desired part can be increased by selecting arbitrarily the position of the bending part of a elongate material.
- the curvature of the bent portion of the long material is reduced while reducing the shortest distance between both ends of the long material, so that the long material can be further compressed in the longitudinal direction. That is, since the surplus of the long material becomes large, the cross-sectional area of the long material can be further increased.
- the curvature of the bent portion of the long material is gradually reduced, so that the cross-sectional area of the long material gradually increases. That is, it becomes difficult to buckle as much as the cross-sectional area increases, so that the buckling deformation of the long material can be prevented when reducing the curvature of the bent portion to a predetermined curvature.
- the second forming die having the punch portion that presses the convex side of the bent portion of the long material inserted between the pair of restraining walls is provided. Therefore, the curvature of the bending part of a long material can be made small. Further, since the distance between the pair of restraint walls is smaller than the total length when the long material is linearly extended, the long material can be restrained in the longitudinal direction when the punch portion presses the long material. it can. Therefore, the long material can be compressed in the longitudinal direction. That is, since the compressed part becomes surplus, the cross-sectional area of the long material can be increased.
- the long material can be further compressed in the longitudinal direction. That is, since the surplus of the long material becomes large, the cross-sectional area of the long material can be further increased.
- each of the pair of restraining walls has a guide surface with which the longitudinal end of the long material abuts when the long material is inserted between the restraining walls. Is guided between the pair of restraining walls. Therefore, the long material can be reliably restrained, and buckling deformation can be prevented.
- the wrinkle holding jig is disposed between the pair of restraining walls and has a support surface that contacts at least the concave side of the bent portion of the long material, the long material is compressed in the longitudinal direction. It is possible to prevent buckling deformation during the process.
- one of the pair of constraint walls is a fixed constraint wall, and the other approaches the fixed constraint wall when the punch portion is moved while contacting the convex side of the bent portion of the long material. Since it is the pressure
- At least one of the fixed restraint wall and the pressure restraint wall includes a work receiving portion that contacts one end of the long material, and an elastic body that biases the work receiving portion toward one end of the long material. Therefore, it is possible to follow the deformation of both ends of the long material when the long material is compressed in the longitudinal direction. That is, when the punch portion presses the convex side of the bent portion of the long material, all the both ends of the long material can be restrained. Therefore, a compressive force can be applied uniformly to the long material, so that buckling deformation when the long material is compressed can be prevented.
- the plurality of divided bodies that support the concave side of the long material are: It is possible to follow the deformation of the long material. Therefore, when the long material is compressed in the longitudinal direction, the long material can always be supported, and buckling deformation when the long material is compressed in the longitudinal direction can be prevented.
- each divided body is provided between the recess for accommodating the connection body when aligned in a line, and the bottom surface of the recess and the end of the connection body inserted in the recess. Since it has a body, the full length of the mandrel can be expanded and contracted. Therefore, the divided body can be brought into contact with almost the entire long material. Therefore, it is possible to further prevent buckling deformation when the long material is compressed in the longitudinal direction.
- each coupling body is provided between a pair of divided coupling bodies that can approach and separate from each other and a pair of divided coupling bodies, and elastically biases the paired divided coupling bodies in a direction to separate them from each other. Since it has a body, the full length of the mandrel can be expanded and contracted. Therefore, the divided body can be brought into contact with almost the entire long material. Therefore, it is possible to further prevent buckling deformation when the long material is compressed in the longitudinal direction.
- the rigidity can be increased.
- the rigidity can be increased.
- the cross-sectional area part since it has a low cross-sectional area part, weight reduction can be achieved.
- the cross-sectional area since the cross-sectional area has an intermediate portion that continuously changes along the longitudinal direction, it is possible to avoid stress concentration at the boundary between the high cross-sectional area portion and the low cross-sectional area portion.
- FIG. 5C It is AA sectional drawing of FIG. 5C. It is AA sectional drawing of FIG. 5C. It is a bottom view which shows a press-formed product. It is a bottom view which shows a press-formed product. It is a bottom view which shows a press-formed product. It is a bottom view which shows a press-formed product. It is a perspective view which shows the modification of the intermediate
- FIG. 9B is a sectional view taken along line BB in FIG. 9B.
- FIG. 9B is a sectional view taken along line BB in FIG. 9B.
- FIG. 9B is a sectional view taken along line BB in FIG. 9B.
- FIG. 15B It is CC sectional drawing of FIG. 15B. It is CC sectional drawing of FIG. 15B. It is CC sectional drawing of FIG. 15B. It is CC sectional drawing of FIG. 15B. It is a bottom view which shows the other modification of the press-formed product which concerns on 1st Embodiment of this invention.
- FIG. 58 is a front view showing a connection body of the mandrel shown in FIG. 57. It is a connection body of the mandrel shown in FIG. 57, Comprising: It is a top view which shows the connection body different from FIG.
- FIG. 75B is a diagram showing a state where the upper mold is lowered to the bottom dead center from the state shown in FIG. 75A. It is a perspective view which shows the other modification of the intermediate
- FIG. 2 is a perspective view showing a press-formed product manufacturing apparatus 1 (hereinafter also simply referred to as manufacturing apparatus 1) according to the first embodiment of the present invention.
- the manufacturing apparatus 1 is used when the intermediate press-formed product 51 is pressed to manufacture the press-formed product 101 (see FIGS. 5A to 5C). In the following, first, the intermediate press-formed product 51 will be described.
- FIGS. 1A to 1D are views showing an intermediate press-formed product 51.
- FIG. 1A is a perspective view
- FIG. 1B is a front view
- FIG. 1C is a plan view
- FIG. 1D is a side view.
- an intermediate press-formed product 51 is a steel material (long material) that is long in one direction, and is provided on both sides of the web portion 52 and the web portion 52 in the width direction, and faces each other. It is comprised from a pair of vertical wall part 53.
- FIG. The web portion 52 includes two straight portions 52a (flat portions) and a bent portion 52b provided between the two straight portions 52a.
- the bent portion 52b of the web portion 52 is a portion that is provided in the central portion in the longitudinal direction of the web portion 52 and is curved in an arc shape.
- the surface (extension surface) that extends by bending is referred to as the convex side (extension side)
- the other surface surface that contracts by bending (contraction surface)
- the concave side contraction side
- the pair of vertical wall portions 53 are provided on the convex side of the bent portion 52 b of the web portion 52.
- the pair of vertical wall portions 53 extend with a certain width between one end and the other end of the web portion 52.
- the central portion in the longitudinal direction of the vertical wall portion 53 is curved with the same curvature as that of the bent portion 52 b of the web portion 52.
- the intermediate press-formed product 51 is manufactured by press-forming a steel plate. For example, by pressing a steel plate having a rectangular shape in plan view to form a straight steel material having a web portion 52 and a pair of vertical wall portions 53, the intermediate press-formed product is obtained by bending the steel material. 51 can be manufactured. Note that the intermediate press-formed product 51 may be directly manufactured by press-forming a steel plate without bending.
- the intermediate press-formed product 51 preferably has an elongated ratio ⁇ represented by the following formula (1) of 100 or more.
- ⁇ L1 / r
- L1 is the total length of the intermediate press-formed product (see FIG. 1B)
- r is the following formula using the cross-sectional secondary moment I and the cross-sectional area A of the intermediate press-formed product 51 ( 2) The secondary radius of the cross section represented by 2).
- r (I / A) 1/2 (2)
- the shortest distance L between both ends (both side edges) in the longitudinal direction of the intermediate press-formed product 51 is smaller than the total length L1 of the intermediate press-formed product 51.
- the total length L1 of the intermediate press-formed product 51 means the total length of the curved web portion 52.
- the shortest distance L means the shortest distance between the short sides 53a and 53b (both side edges of the vertical wall portion) of the vertical wall portion 53.
- the manufacturing apparatus 1 includes a lower mold 10 (first mold) and an upper mold 20 (second mold).
- the lower mold 10 and the upper mold 20 are installed in a press molding machine (not shown).
- the press molding machine may be a normal press molding machine, but is more preferably a servo press molding machine capable of arbitrarily adjusting the bottom dead center and the lowering speed of the mold.
- the lower mold 10 includes a base part 11, a pair of long side walls 12 fixed to the base part 11 and facing each other, and a pair of short side walls 13 (a pair of restraining walls) fixed to the base part 11 and facing each other.
- the upper mold 20 includes a main body portion 21 and a punch portion 22 having a convex portion 23.
- a groove portion 14 is formed by the pair of long side walls 12 and the pair of short side walls 13.
- an intermediate press molded product 51 is disposed between the lower mold 10 and the upper mold 20. Then, when the upper mold 20 is lowered, the intermediate press-formed product 51 is pressed and pushed into the groove portion 14.
- FIG. 3A is a longitudinal sectional view showing the manufacturing apparatus 1
- FIG. 3B is a transverse sectional view showing the manufacturing apparatus 1.
- the wall surfaces 13 a side surfaces of the pair of short side walls 13 and the wall surfaces 12 a of the pair of long side walls 12 are perpendicular to the upper surface 11 a of the base portion 11.
- a convex curved surface 13b guide surface is provided on the upper surface of the wall surface 13a.
- the groove portion 14 formed by the pair of long side walls 12 and the pair of short side walls 13 has a length corresponding to the shortest distance L (see FIG. 1B) between both ends of the intermediate press-formed product 51.
- the length of the groove portion 14 is equal to the shortest distance L between both ends of the intermediate press-formed product 51.
- the groove portion 14 has a width corresponding to the distance between the pair of vertical wall portions 53 of the intermediate press-formed product 51. That is, the width of the groove 14 (the distance between the wall surfaces 12 a of the pair of long side walls 12) is equal to the width of the intermediate press-formed product 51. Further, the depth of the groove portion 14 is equal to the width of the vertical wall portion 53 of the intermediate press-formed product 51.
- the convex portion 23 of the punch portion 22 has a pair of side surfaces 23 a provided on both sides in the width direction and a tip surface 23 b facing the groove portion 14.
- the convex portion 23 of the punch portion 22 enters the groove portion 14 of the lower mold 10 when the upper mold 20 is lowered and the upper mold 20 and the lower mold 10 are brought close to each other.
- the convex portion 23 may be integrated with the punch portion 22 or may be separate from the punch portion 22.
- the length of the convex portion 23 is equal to or shorter than the shortest distance L of the intermediate press-formed product 51, and the width of the convex portion 23 (the distance between the pair of side surfaces 23a) is a pair of vertical wall portions of the intermediate press-formed product 51. Equal to the distance between the inner surfaces of 53.
- the intermediate press-formed product 51 is disposed immediately above the groove portion 14 of the lower mold 10.
- the intermediate press-formed product 51 is arranged so that the convex side (extension side: see FIG. 1B) of the bent portion 52 b of the intermediate press-formed product 51 faces the upper mold 20.
- the convex part 23 of the punch part 22 can be made to contact
- the short sides 53 a and 53 b of the vertical wall portion 53 of the intermediate press-formed product 51 abut on the convex curved surface 13 b of the short side wall 13.
- the distance between the wall surfaces 13 a of the pair of short side walls 13 is equal to the shortest distance L between both ends in the longitudinal direction of the intermediate press-formed product 51, and further, the bending portion 52 b of the intermediate press-formed product 51 Since the convex side is pressed, the curvature of the bent portion 52b of the intermediate press-formed product 51 can be reduced while restraining both ends in the longitudinal direction of the intermediate press-formed product 51.
- the total length L1 (see FIG. 1B) of the web portion 52 of the intermediate press-formed product 51 is greater than the shortest distance L between both ends in the longitudinal direction of the intermediate press-formed product 51.
- the compressive stress is applied to the vertical wall part 53 along the longitudinal direction, and the intermediate press-formed product 51 can be compressed in the longitudinal direction. That is, the thickness (cross-sectional area) of the web portion 52 and the vertical wall portion 53 of the intermediate press-formed product 51 can be increased by the amount compressed.
- the web portion 52 of the intermediate press-formed product 51 When compressive stress is applied to the intermediate press-formed product 51, as shown in FIG. 4B, the web portion 52 of the intermediate press-formed product 51 has the upper surface 11a of the base portion 11 of the lower mold 10 and the upper mold 20 as shown in FIG. Since it is pinched by the front end surface 23b of the convex part 23, the buckling deformation of the web part 52 can be prevented.
- the vertical wall portion 53 of the intermediate press-formed product 51 is sandwiched between the wall surfaces 12a (see FIG. 3B) of the pair of long side walls 12 of the lower mold 10 and the side surface 23a of the convex portion 23 of the upper mold 20. Therefore, buckling deformation of the vertical wall portion 53 can be prevented.
- the short sides 53a and 53b of the intermediate press-formed product 51 are pushed into the groove portion 14 while being in contact with the convex curved surface 13b of the short-side wall 13, the end portions in the longitudinal direction of the intermediate press-formed product 51 are buckled and deformed. Can be prevented. Therefore, buckling deformation of the web part 52 and the vertical wall part 53 of the intermediate press-formed product 51 can be prevented, and the web part 52 and the vertical wall part 53 can be increased in thickness.
- the press-formed product 101 is manufactured from the intermediate press-formed product 51 by the press forming described above.
- FIGS. 5A to 5C are views showing the press-formed product 101 according to this embodiment.
- 5A is a perspective view
- FIG. 5B is a front view
- FIG. 5C is a side view.
- the press-formed product 101 is obtained by setting the curvature of the bent portion 52b of the intermediate press-formed product 51 to zero while restraining both ends of the intermediate press-formed product 51. Therefore, as shown in FIGS. 5A to 5C, the press-formed product 101 has a straight shape, and the total length L ′ of the press-formed product 101 is equal to the shortest distance L between both ends in the longitudinal direction of the intermediate press-formed product 51. Become.
- FIG. 6A to 6C are cross-sectional views taken along the line AA in FIG. 5C, showing an example of an increase in wall thickness (increase in cross-sectional area) of the press-formed product 101.
- FIG. FIG. 6A shows a case where the upper surface 102a of the web portion 102 of the press-formed product 101 is a flat surface, and the lower surface 102b is a surface that is raised by increasing the thickness.
- the web part 102 of the press-formed product 101 includes a thick part 102c (high cross-sectional area part) having the largest thickness and a thin part 102d (low profile) having a thickness smaller than that of the thick part 102c.
- the thick portion 102c is the portion with the largest cross-sectional area
- the thin portion 102d is the portion with the smallest cross-sectional area.
- the bent portion 52b of the intermediate press-formed product 51 becomes the thick portion 102c of the press-formed product 101, and the straight portion 52a of the intermediate press-formed product 51 becomes the thin portion 102d.
- the length of the bent portion 52b is shorter than the straight portion 52a (see FIG. 1B)
- the length of the thin portion 102d is larger than the length of the thick portion 102c.
- FIG. 6B shows a case where the lower surface 102b of the web portion 102 is a flat surface, and the upper surface 102a is a raised surface due to increased thickness.
- FIG. 6C shows a case where the upper surface 102a and the lower surface 102b of the web portion 102 are raised surfaces due to the increased thickness.
- FIGS. 6D to 6F are bottom views of the press-formed product 101, showing an example of an increase in wall thickness (increase in cross-sectional area).
- FIG. 6D shows a case where the outer surface 103a of the vertical wall portion 103 is a flat surface, and the inner surface 103b is a surface that is raised due to increased thickness.
- the vertical wall portion 103 includes a thickest portion 103c (high cross-sectional area portion) having the largest thickness, and a thin-walled portion 103d (low cross-sectional area portion) having a smaller thickness than the thick portion 103c.
- the intermediate portion 103e is provided between the thick portion 103c and the thin portion 103d and has a thickness that continuously changes along the longitudinal direction.
- the length of the thin part 103d of the vertical wall part 103 is larger than the length of the thick part 103c.
- FIG. 6E shows a case where the inner surface 103b of the vertical wall portion 103 is a flat surface, and the outer surface 103a is a raised surface due to increased thickness.
- FIG. 6F shows a case where the outer surface 103a and the inner surface 103b of the vertical wall portion 103 are raised surfaces due to increased thickness.
- each surface of the web portion 102 and the vertical wall portion 103 of the press-molded product 101 is a flat surface or a surface that is raised by increasing the thickness.
- the distance between the groove portion 14 and the convex portion 23 of the upper mold 20 and the bottom dead center of the upper mold 20 are determined.
- the web portion 102 and the vertical wall portion 103 of the press-formed product 101 are provided with the thick wall portion 102c or the thick wall portion 103c, and the web portion 102 and the vertical wall portion 103 are partially thick. Therefore, the rigidity of the press-molded product 101 can be increased because the cross-sectional area is partially increased when viewed in a cross section perpendicular to the longitudinal direction. Furthermore, since the press-formed product 101 is manufactured by compressing the intermediate press-formed product 51 in the longitudinal direction, the yield strength of the press-formed product 101 can be increased by work hardening. Further, since the intermediate portion 102e is provided between the thick portion 102c and the thin portion 102d, it is possible to avoid stress concentration on the boundary between the thick portion 102c and the thin portion 102d.
- the thickness of the thick portion 102 c of the press-formed product 101 is determined by the total length, thickness, curvature, material, and the like of the intermediate press-formed product 51. % Or more is preferable, and 110% or more is more preferable. Further, the upper limit of the thickness of the thick portion 102c of the press-formed product 101 is not particularly limited, but may be 140% or less with respect to the thickness of the intermediate press-formed product 51, or 135% or less. It may be 130% or less.
- the length of the thin portion 102d is larger than the length of the thick portion 102c, only the necessary portion can be increased in rigidity, and the weight of the part can be reduced.
- the length of the thin portion 103d is larger than the length of the thick portion 103c, only a necessary portion can be increased in rigidity, and the weight of the component can be reduced.
- the press-formed product 101 can be suitably used for automobile parts such as a center pillar reinforcement, a floor cross member, or a rocker reinforcement.
- the straight-shaped press-formed product 101 is manufactured by setting the curvature of the bent portion 52b of the intermediate press-formed product 51 to zero is shown.
- the present embodiment is not limited to this, and the press-formed product 101 may be manufactured by reducing the curvature of the bent portion 52b of the intermediate press-formed product 51 to a predetermined curvature. That is, the curvature of the bent portion 52b after press forming is not limited to zero, and a curvature smaller than the curvature of the bent portion 52b before press forming may be left.
- an intermediate press-formed product 51 having a bent portion 52b is prepared, and the shortest distance between both ends in the longitudinal direction of the intermediate press-formed product 51 is kept constant,
- the intermediate press-formed product 51 is compressed along the longitudinal direction, and the material becomes redundant by the amount of compression. Therefore, this surplus material increases the thickness (cross-sectional area) of part of the web portion 52.
- the thickness (cross-sectional area) of a part of the vertical wall portion 53 also increases. In this way, it is possible to manufacture a lightweight and high-rigidity press-formed product 101 having the web portion 102 and the vertical wall portion 103 having increased thickness (in which the cross-sectional area is increased) without requiring welding. it can.
- the distance between the pair of short side walls 13 of the manufacturing apparatus 1 is equal to the shortest distance L of the intermediate press-formed product 51 is shown.
- the distance between the pair of short side walls 13 of the manufacturing apparatus 1 only needs to be smaller than the total length L1 of the intermediate press-formed product 51 (the length when the intermediate press-formed product 51 is linearly extended).
- the intermediate press-formed product 51 can be compressed along the longitudinal direction, and the increased press-formed product 101 can be manufactured without requiring welding.
- FIGS. 7A to 7C are views showing the intermediate press-formed product 61.
- FIG. 7A is a perspective view
- FIG. 7B is a front view
- FIG. 7C is a side view.
- the intermediate press-formed product 61 has a web portion 62 and a pair of vertical wall portions 63, like the intermediate press-formed product 51.
- the web portion 62 of the intermediate press-formed product 61 is composed of a bent portion 62b and has a curved shape as a whole.
- FIG. 8 is a view showing a state in which the intermediate press-formed product 61 is arranged in the manufacturing apparatus 1. Similarly to the case where the press-formed product 101 is manufactured, the intermediate press-formed product 61 can be compressed along the longitudinal direction by lowering the upper mold 20 of the manufacturing apparatus 1.
- 9A and 9B are diagrams showing a press-formed product 111 manufactured from the intermediate press-formed product 61.
- FIG. 9C to 9H show an example in which the web portion 112 and the vertical wall portion 113 of the press-formed product 111 are increased in thickness.
- FIG. 9C to 9E are cross-sectional views taken along the line BB of FIG. 9B.
- the upper surface 112a of the web portion 112 is a flat surface
- the lower surface 112b is a surface that is raised by increasing the thickness.
- the web part 112 is provided between the thick part 112c having the thickest thickness, the thin part 112d having a thickness thinner than the thick part 112c, and the thick part 112c and the thin part 112d, and the thickness is continuous.
- an intermediate portion 112e that changes to
- FIG. 9D shows a case where the lower surface 112b of the web portion 112 is a flat surface, and the upper surface 112a is a raised surface due to increased thickness.
- FIG. 9E shows the case where the upper surface 112a and the lower surface 112b of the web part 112 are raised surfaces due to the increased thickness.
- FIG. 9F to 9H are bottom views of the press-formed product 111.
- the outer surface 113a of the vertical wall portion 113 is a flat surface
- the inner surface 113b is a surface that rises due to the increased thickness.
- the vertical wall portion 113 is provided between the thickest portion 113c having the largest thickness, the thin portion 113d having a smaller thickness than the thick portion 113c, and the thick portion 113c and the thin portion 113d. It has an intermediate portion 113e that changes continuously.
- FIG. 9G shows a case where the inner surface 113b of the vertical wall portion 113 is a flat surface and the outer surface 113a is a raised surface due to the increase in thickness.
- FIG. 9H shows the case where the inner surface 113b and the outer surface 113a of the vertical wall portion 113 are raised surfaces due to increased thickness.
- an intermediate press-formed product 71 shown in FIGS. 10A to 10C can be used.
- the intermediate press-formed product 71 includes a web portion 72, a pair of vertical wall portions 73 connected to both sides of the web portion 72 in the width direction, and a pair of vertical wall portions 73, respectively. And a flange portion 74 to be connected.
- the intermediate press-formed product 71 is different from the intermediate press-formed product 51 (see FIGS. 1A to 1D) in that it has a flange portion 74.
- FIGS. 12A and 12B are views showing a state in which the intermediate press-formed product 71 is arranged in the manufacturing apparatus 1, and FIGS. 12A and 12B show a state in which the upper mold 20 of the manufacturing apparatus 1 is lowered to the bottom dead center.
- FIG. 12B Similarly to the case of manufacturing the press-formed product 101, the intermediate press-formed product 71 can be compressed along the longitudinal direction by lowering the upper mold 20 of the manufacturing apparatus 1.
- the flange portion 74 of the intermediate press-formed product 71 is sandwiched and restrained between the punch portion 22 and the upper surface of the long side wall 12 during press forming. Thereby, it is possible to prevent the flange portion 74 from being wrinkled.
- an intermediate press-formed product 81 shown in FIGS. 13A to 13C can be used.
- the intermediate press-formed product 81 includes a web portion 82 and a pair of vertical wall portions 83 connected to both sides of the web portion 82 in the width direction.
- the intermediate press-formed product 81 is different from the intermediate press-formed product 51 (see FIGS. 1A to 1D) in that it has three straight portions 52a and two bent portions 52b.
- FIG. 14 is a view showing a state in which the intermediate press-formed product 81 is arranged in the manufacturing apparatus 1.
- the intermediate press-formed product 81 can be compressed in the longitudinal direction.
- the press-formed product 131 shown in FIGS. 15A and 15B can be manufactured from the intermediate press-formed product 81.
- 15C to 15H show an example in which the web portion 132 and the vertical wall portion 133 of the press-formed product 131 are increased in thickness.
- FIG. 15C to 15E are CC cross-sectional views of FIG. 15B.
- the upper surface 132a of the web portion 132 remains a flat surface
- the lower surface 132b is a raised surface due to the increase in thickness.
- the web portion 132 includes a thick portion 132c, a thin portion 132d, and an intermediate portion 132e that is provided between the thick portion 132c and the thin portion 132d and whose thickness continuously changes along the longitudinal direction. Is provided.
- the thick part 132c is provided in two places, and the thin part 132d is provided in three places.
- the thick part 132 c is provided at a position corresponding to the bent part 52 b of the intermediate press-formed product 81
- the thin part 132 d is provided at a position corresponding to the straight part 52 a of the intermediate press-formed product 81.
- FIG. 15D shows a case where the lower surface 132b of the web portion 132 remains a flat surface, and the upper surface 132a is a raised surface due to increased thickness.
- FIG. 15E shows a case where the upper surface 132a and the lower surface 132b of the web portion 132 are raised surfaces due to the increased thickness.
- FIG. 15F to 15H are bottom views of the press-formed product 131.
- the outer surface 133a of the vertical wall part 133 remains a flat surface
- the inner surface 133b is a surface that is raised due to the increase in thickness.
- the vertical wall part 133 is provided with a thick part 133c, a thin part 133d, and an intermediate part 133e provided between the thick part 133c and the thin part 133d.
- the thick part 133c is provided in two places, and the thin part 133d is provided in three places.
- the thick portion 133c is provided at a position corresponding to the bent portion 52b of the intermediate press-formed product 81, and the thin portion 133d is provided at a position corresponding to the straight portion 52a of the intermediate press-formed product 81.
- FIG. 15G shows a case where the inner surface 133b of the vertical wall portion 133 remains a flat surface, and the outer surface 133a is a raised surface due to increased thickness.
- FIG. 15H shows a case where the outer surface 133a and the inner surface 133b of the vertical wall portion 133 are raised due to the increase in thickness.
- the intermediate press molded product 141 which has the bending part 141b and the linear part 141a can also be used.
- the cross section of the intermediate press-formed product 141 is a solid circle. In this case, by pressing the intermediate press-formed product 141 with the manufacturing apparatus 1, a press-formed product having a solid circular cross section with an increased cross-sectional area can be manufactured.
- an intermediate press-formed product 143 having a bent portion 143b and a straight portion 143a can be used.
- the cross section of the intermediate press-formed product 143 is a solid square. In this case, by pressing the intermediate press-formed product 143 with the manufacturing apparatus 1, a press-formed product having a solid square cross section with an increased cross-sectional area can be manufactured.
- an intermediate press-formed product 145 having a bent portion 145b and a straight portion 145a can be used.
- the cross section of the intermediate press-formed product 145 is a hollow circle. In this case, by pressing the intermediate press-formed product 145 with the manufacturing apparatus 1, it is possible to manufacture a press-formed product having a hollow circular cross section with an increased cross-sectional area.
- an intermediate press-formed product 147 having a bent portion 147b and a straight portion 147a can also be used.
- the cross section of the intermediate press-formed product 147 is a hollow ellipse. In this case, by pressing the intermediate press-formed product 147 with the manufacturing apparatus 1, a press-formed product with a hollow elliptical cross section having an increased cross-sectional area can be manufactured.
- an intermediate press-formed product 151 having a bent portion 151b and a straight portion 151a can be used.
- the cross section of the intermediate press-formed product 151 is a solid rectangle.
- one of the two side surfaces orthogonal to the width direction is a surface (elongated surface) that extends by bending, and the other of the two side surfaces is a surface (contracted surface) that contracts by bending.
- the intermediate press-formed product 151 is disposed in the manufacturing apparatus 1 so that the extended surface of the bent portion 151b faces the upper mold 20. In this case, by pressing the intermediate press-formed product 151 with the manufacturing apparatus 1, a press-formed product having a solid rectangular cross section with an increased cross-sectional area can be manufactured.
- an intermediate press-formed product 153 having a bent portion 153b and a straight portion 153a can also be used.
- the cross section of the intermediate press-formed product 153 is a solid rectangle.
- one of the two surfaces orthogonal to the thickness direction is a surface (extension surface) that extends by bending, and the other of the two surfaces is a surface (contraction surface) that contracts by bending. is there.
- the intermediate press-formed product 51 is arranged in the manufacturing apparatus 1 so that the extended surface of the bent portion 153b faces the upper mold 20. In this case, by pressing the intermediate press-formed product 153 with the manufacturing apparatus 1, it is possible to manufacture a press-formed product having a solid rectangular cross section with an increased cross-sectional area.
- an intermediate press-formed product 155 having an L-shaped cross section having a bent portion 155b and a straight portion 155a can also be used.
- a press-formed product having an L-shaped cross section with an increased cross-sectional area can be manufactured.
- an intermediate press-formed product 157 having a Z-section and a bent portion 157b and a straight portion 157a may be used.
- the manufacturing apparatus 1 by pressing the intermediate press-formed product 157 with the manufacturing apparatus 1, it is possible to manufacture a Z-shaped press-formed product having an increased cross-sectional area.
- one of the pair of long side walls 12 of the manufacturing apparatus 1 is L-shaped as shown in FIG. 23B.
- FIG. 24A and FIG. 24B are views showing an intermediate press-formed product 251 used in the second embodiment.
- 24A is a perspective view
- FIG. 24B is a front view.
- the intermediate press-formed product 251 is a steel material (long material) that is long in one direction, and is a pair of vertical portions connected to the web portion 252 and both sides of the web portion 252 in the width direction.
- the web portion 252 is provided with two straight portions 252a and a bent portion 252b disposed between the straight portions 252a.
- the bent portion 252b is a portion that is provided in the central portion in the longitudinal direction of the web portion 252 and is curved in an arc shape.
- the surface that extends by the bending process is the expansion surface
- the other surface is the contraction surface.
- the second embodiment is different from the first embodiment in that a pair of vertical wall portions 253 are provided on the contraction surface of the bent portion 252b. Further, the short side 253a and the short side 253b of the vertical wall portion 253 of the intermediate press-formed product 251 are parallel to each other. That is, the planes including the edges at both ends in the longitudinal direction of the intermediate press-formed product 251 are parallel to each other.
- the intermediate press-formed product 251 can be obtained by press-forming a steel plate, bending the steel plate, and then cutting off both longitudinal ends of the vertical wall portion 253 of the intermediate press-formed product 251.
- the steel plate may be pre-molded before press forming the steel plate.
- 25A and 25B are diagrams showing a press-formed product manufacturing apparatus 200 (hereinafter simply referred to as a manufacturing apparatus 200) according to the second embodiment.
- 25A is a perspective view
- FIG. 25B is a side view.
- the upper mold 20 has the punch part 22 having the convex part 23, and the lower mold 10 has the pair of short side walls 13 and the pair of long side walls 12. Indicated.
- the upper mold 220 has the punch portion 222 having the recess 223, and the lower mold 210 is replaced with the pair of long side walls 12 instead of the base. It has a convex part 214 provided in the part 11.
- illustration of the main-body part 21 (refer FIG. 2) is abbreviate
- the width of the concave portion 223 of the punch portion 222 of the upper mold 220 is equal to the entire width of the intermediate press-formed product 251.
- the length of the recess 223 is equal to the distance between the pair of short side walls 13 and is equal to the distance L (shortest distance) between both ends in the longitudinal direction of the intermediate press-formed product 251.
- the depth of the concave portion 223 is equal to the width of the vertical wall portion 253 of the intermediate press-formed product 251.
- the width of the convex portion 214 of the lower mold 210 is equal to the distance between the inner surfaces of the pair of vertical wall portions 253 of the intermediate press-formed product 251.
- the length of the convex portion 214 is equal to the distance between the pair of short side walls 13 and is equal to the distance L between both ends in the longitudinal direction of the intermediate press-formed product 251.
- FIG. 26 is a front view showing a state in which the intermediate press-formed product 251 is arranged in the manufacturing apparatus 200.
- the upper mold 220 is shown in a longitudinal sectional view.
- the intermediate press-formed product 251 is disposed immediately above the convex portion 214 such that the pair of vertical wall portions 253 of the intermediate press-formed product 251 sandwich the convex portion 214 of the lower mold 210. .
- both longitudinal ends of the intermediate press-formed product 251 are constrained.
- both ends in the longitudinal direction of the intermediate press-formed product 251 are parallel to each other, both ends in the longitudinal direction of the intermediate press-formed product 251 are parallel to the pair of short side walls 13.
- An intermediate press-formed product 251 can be disposed. Therefore, when press-molding the intermediate press-formed product 251, a load can be evenly applied to the intermediate press-formed product 251, and as a result, buckling deformation of the intermediate press-formed product 251 can be prevented.
- FIG. 27A and 27B are views showing a state where the upper mold 220 is lowered to the bottom dead center.
- FIG. 27A is a front view
- FIG. 27B is a side view.
- the curvature of the bent portion 252b of the intermediate press-formed product 251 is reduced while restraining both ends in the longitudinal direction of the intermediate press-formed product 251.
- the intermediate press-formed product 251 can be compressed in the longitudinal direction, and the web portion 252 and the vertical wall portion 253 of the intermediate press-formed product 251 are increased in thickness.
- the intermediate press-formed product 251 is sandwiched between the concave portion 223 of the upper mold 220 and the convex portion 214 of the lower mold 210, and the bent portion 252b of the intermediate press-formed product 251 is interposed. Press molding to reduce the curvature.
- the web portion 252 of the intermediate press-formed product 251 causes the bottom surface 223 a of the concave portion 223 of the upper mold 220 and the convex portion 214 of the lower mold 210. Since it is sandwiched between the upper surface 214a, buckling deformation of the web portion 252 can be prevented.
- the vertical wall portion 253 of the intermediate press-formed product 251 is sandwiched between the side surface 223b of the concave portion 223 of the upper mold 220 and the side surface 214b of the convex portion 214 of the lower mold 210, the vertical wall portion 253 is buckled. Deformation can be prevented.
- an intermediate press-formed product 261 shown in FIGS. 28A to 28D can be used.
- the intermediate press-formed product 261 has a web portion 262 and a vertical wall portion 263.
- the web portion 262 of the intermediate press-formed product 261 is composed of a bent portion 262b, and has a curved shape as a whole.
- the short sides 263 a and 263 b of the vertical wall portion 263 of the intermediate press-formed product 261 are parallel to each other, like the intermediate press-formed product 251.
- FIG. 29 is a view showing a state in which the intermediate press-formed product 261 is arranged in the manufacturing apparatus 200. Similar to the intermediate press 251, by lowering the upper mold 220, the intermediate press-formed product 261 can be compressed in the longitudinal direction, and the web portion 262 and the vertical wall portion 263 can be increased in thickness.
- FIGS. 30A and 30B are diagrams showing a press-molded product manufacturing apparatus 300 (hereinafter, also simply referred to as a manufacturing apparatus 300) according to the third embodiment.
- the manufacturing apparatus 300 according to the present embodiment is different from the manufacturing apparatus 1 according to the first embodiment in having a wrinkle pressing pad 331 (wrinkle pressing jig).
- the wrinkle pressing pad 331 is inserted into the through hole 11b provided in the base portion 11 of the lower mold 10.
- the wrinkle holding pad 331 can be raised and lowered in accordance with the movement of the upper mold 20 and the lower mold 10 and can be stored in the through hole 11b.
- FIGS. 32A to 32C are diagrams showing the wrinkle pressing pad 331.
- the wrinkle pressing pad 331 includes a main body portion 331a and a shaft portion 331b connected to the main body portion 331a.
- the shaft portion 331b is inserted into a through hole 11b provided in the lower mold 10.
- the main body 331a of the wrinkle pressing pad 331 has an upper surface 331c and a side surface 331d.
- the upper surface 331 c is a convex curved surface provided at the top of the main body 331 a and abuts on the bent portion 52 b of the web portion 52 of the intermediate press-formed product 51.
- the side surface 331d is a flat surface provided on the side portion of the main body portion 331a.
- the upper surface 331c has a curvature smaller than the curvature of the bent portion 52b (see FIG. 1B) of the intermediate press-formed product 51. Thereby, buckling deformation of the web part 52 of the intermediate press-formed product 51 can be suppressed.
- the upper mold 20 is lowered, and the convex part 23 of the upper mold 20 is brought into contact with the convex side (extended surface) of the bent part 52 b of the web part 52 of the intermediate press-formed product 51.
- the intermediate press molding is performed while the web portion 52 of the intermediate press molded product 51 is sandwiched between the wrinkle pressing pad 331 and the upper mold 20.
- the product 51 is compressed in the longitudinal direction. Since the wrinkle pressing pad 331 can be raised and lowered as described above, it is lowered while being pressed by the upper mold 20.
- the wrinkle holding pad 331 remains in contact with the web portion 52 of the intermediate press-formed product 51 while being pushed down by the upper mold 20, so that the web portion 52 of the intermediate press-formed product 51 undergoes buckling deformation. Can be prevented.
- an intermediate press-formed product 351 shown in FIGS. 33A to 33C can be used instead of the intermediate press-formed product 51.
- the intermediate press-formed product 351 includes a web portion 352 and a pair of vertical wall portions 353 connected to both sides of the web portion 352 in the width direction.
- the intermediate press-formed product 351 is different from the intermediate press-formed product 251 (see FIGS. 24A and 24B) in that it has four straight portions 252a, one bent portion 252b, and two bent portions 352c. Yes.
- the bent portion 352c of the intermediate press-formed product 351 protrudes in the direction opposite to the direction in which the bent portion 252b protrudes.
- FIG. 34A is a view showing a state in which the intermediate press-formed product 351 is arranged in the manufacturing apparatus 300.
- FIG. FIG. 34B is a diagram showing a state where the upper mold 20 of the manufacturing apparatus 300 is lowered to the bottom dead center. Similar to the case where the intermediate press-formed product 51 is press-formed using the manufacturing apparatus 300, the intermediate press-formed product 351 can be compressed in the longitudinal direction by lowering the upper forming die 20. At this time, the upper surface 331 c of the wrinkle pressing pad 331 comes into contact with the bent portion 252 b of the web portion 352 of the intermediate press-formed product 351, and the side surface 331 d comes into contact with the inner surface of the vertical wall portion 353 of the intermediate press-formed product 351. For this reason, buckling deformation of the intermediate press-formed product 351 can be prevented.
- an intermediate press-formed product 361 shown in FIGS. 35A to 35C can be used.
- the intermediate press-formed product 361 includes a web portion 362 and a pair of vertical wall portions 363 connected to both sides of the web portion 362 in the width direction.
- the intermediate press-formed product 361 corresponds to a case where the bent portion 252b of the intermediate press-formed product 351 is moved to one end side. In other words, the intermediate press-formed product 361 is different in the position of the bent portion 252b from the intermediate press-formed product 351 shown in FIGS. 33A to 33C.
- FIG. 36 is a diagram showing the intermediate press-formed product 361 and the manufacturing apparatus 300.
- the wrinkle holding pad 331 is arranged so that the upper surface 331c of the wrinkle holding pad 331 is in contact with the bent portion 252b of the intermediate press-formed product 361.
- the wrinkle pressing pad 331 By arranging the wrinkle pressing pad 331 in this manner, buckling deformation of the intermediate press-formed product 361 can be prevented in the same manner as the intermediate press-formed product 351.
- FIGS. 37A and 37B are diagrams showing a press-formed product manufacturing apparatus 400 (hereinafter also referred to as manufacturing apparatus 400) according to the fourth embodiment.
- manufacturing apparatus 400 a press-formed product manufacturing apparatus 400 (hereinafter also referred to as manufacturing apparatus 400) according to the fourth embodiment.
- the manufacturing apparatus 300 had one wrinkle pressing pad 331 was shown.
- the manufacturing apparatus 400 according to the present embodiment has three wrinkle pressing pads 331.
- FIG. 38 is a view showing a state where the intermediate press-formed product 51 is press-formed using the manufacturing apparatus 400.
- FIG. As described above, since the manufacturing apparatus 400 has the three wrinkle pressing pads 331, the web portion 52 and the vertical wall portion 53 of the intermediate press-formed product 51 can be more reliably prevented from buckling.
- the number of wrinkle pressing pads 331 may be two, or four or more.
- an intermediate press-formed product 451 shown in FIGS. 39A to 39C can be used.
- the intermediate press-formed product 451 has a web portion 452 and a pair of vertical wall portions 453 connected to both sides of the web portion 452 in the width direction.
- the intermediate press-formed product 451 is different from the intermediate press-formed product 251 (see FIGS. 24A and 24B) in that it includes three linear portions 252a and two bent portions 252b.
- FIGS. 40A and 40B are views showing a state in which the intermediate press-formed product 451 is arranged in the manufacturing apparatus 400.
- FIG. As shown in FIGS. 40A and 40B, when the intermediate press-formed product 451 is press-molded, the wrinkle pressing pad 331 is arranged so that the upper surface 331c of the wrinkle pressing pad 331 contacts the bent portion 252b of the intermediate press-formed product 451. Deploy. That is, two of the three wrinkle pressing pads 331 are disposed so as to contact the bent portion 252b, and the remaining one is disposed so as to contact the linear portion 252a.
- FIG. 41 is a view showing a state where the intermediate press-formed product 451 is press-formed. As shown in FIG. 41, the web portion 452 of the intermediate press-formed product 451 is sandwiched between the upper mold 20 and the wrinkle holding pad 331, and the vertical wall portion 453 of the intermediate press-formed product 451 is the lower mold. 10 and the wrinkle pressing pad 331. Therefore, buckling deformation of the intermediate press-formed product 451 can be prevented.
- an intermediate press-formed product 461 shown in FIGS. 42A to 42C can be used.
- the intermediate press-formed product 461 includes a web portion 462 and a pair of vertical wall portions 463 connected to both sides of the web portion 462 in the width direction.
- the intermediate press-formed product 461 is different from the intermediate press-formed product 351 (see FIGS. 33A to 33C) in that it includes five straight portions 252a and two bent portions 252b.
- FIG. 43 is a front view showing a press-formed product manufacturing apparatus 500 (hereinafter also simply referred to as manufacturing apparatus 500) according to the fifth embodiment. As illustrated in FIG. 43, the manufacturing apparatus 500 is different from the manufacturing apparatus 200 according to the second embodiment in that it includes a mandrel 510 disposed between the pair of short side walls 13.
- FIG. 44 is a front view showing the mandrel 510 and the intermediate press-formed product 251 according to the present embodiment.
- FIG. 45 is a schematic front view showing the mandrel 510.
- the mandrel 510 includes a plurality of divided bodies 511 and a connecting body 520 that connects the divided bodies 511.
- the plurality of divided bodies 511 of the mandrel 510 are inserted into a space surrounded by the web portion 252 and the pair of vertical wall portions 253 of the intermediate press-formed product 251.
- the divided body 511X located at the center in the longitudinal direction comes into contact with the concave side (shrink surface) of the bent portion 252b of the web portion 252 of the intermediate press-formed product 251. Further, a shaft portion 515 to be inserted into a through hole provided in the center in the longitudinal direction of the convex portion 214 of the lower mold 210 is connected to the divided body 511X (see FIG. 43). Therefore, the mandrel 510 can be moved up and down in accordance with the movement of the upper mold 220.
- the total length of the mandrel 510 is set to be equal to or less than the distance L (see FIGS. 24A and 24B) between both ends in the longitudinal direction of the intermediate press-formed product 251.
- the total length of the mandrel 510 is set to be equal to or less than the distance between the pair of short side walls 13. This is to avoid interference between the mandrel 510 and the pair of short side walls 13 when the divided bodies 511 of the mandrel 510 are arranged in a line (see FIG. 49).
- the divided body 511 has an upper surface 511b that contacts the web portion 252 of the intermediate press-formed product 251 and a side surface 511c that contacts the vertical wall portion 253 of the intermediate press-formed product 251.
- the upper surface 511b of the divided body 511 is a convex curved surface
- the side surface 511c of the divided body 511 is a flat surface.
- FIG. 46 is an enlarged front view showing the mandrel 510.
- the divided body 511 of the mandrel 510 includes a recess 513 provided at an end portion in the longitudinal direction of the divided body 511 and a stopper 514 provided on the inner surface of the recess 513.
- the engaging portion 522 of the connecting body 520 that connects the adjacent divided bodies 511 is inserted into the recess 513 on the inner side of the stopper 514.
- the stopper 514 is a protrusion provided in the recessed portion 513 of the divided body 511 and restricts the movement of the engaging portion 522 of the connecting body 520.
- FIG. 47 is a perspective view showing the coupling body 520.
- the connecting body 520 includes a rod-shaped main body 521 and spherical engaging portions 522 provided at both ends of the main body 521 in the longitudinal direction.
- the plurality of divided bodies 511 of the mandrel 510 can be close to each other or separated from each other. That is, as shown in FIG. 43, the plurality of divided bodies 511 can be arranged in an arc shape along the shape of the intermediate press-formed product 251 or can be arranged in a straight line (one line).
- FIG. 49 is a front view showing the manufacturing apparatus 500 and shows a state where the upper mold 220 is lowered to the bottom dead center.
- the mandrel 510 is lowered while being pushed by the upper mold 220. Therefore, the mandrel 510 remains in contact with the web portion 252 and the vertical wall portion 253 of the intermediate press-formed product 251 while being pushed down by the upper mold 220, and the web portion 252 and the vertical wall portion being processed are in contact with each other. 253 buckling deformation can be prevented.
- the mandrel 510 follows the deformation of the web portion 252 of the intermediate press-formed product 251 and changes from the arc shape to the linear shape of the divided bodies 511 (the positional relationship between the divided bodies changes). Therefore, the mandrel 510 can be brought into contact with the web portion 252 and the vertical wall portion 253 of the intermediate press-formed product 251 while the upper mold 220 is lowered to the bottom dead center.
- the intermediate press-formed product 251 is press-formed while the mandrel 510 is brought into contact with the web portion 252 and the vertical wall portion 253 of the intermediate press-formed product 251, so that the web portion 252 and the vertical wall portion are formed.
- the buckling deformation of H.253 can be surely prevented.
- FIG. 50 is a front view showing a press-formed product manufacturing apparatus 600 (hereinafter also simply referred to as manufacturing apparatus 600) according to the sixth embodiment.
- manufacturing apparatus 600 includes the mandrel 610 instead of the mandrel 510 in the present embodiment.
- the mandrel 510 according to the fifth embodiment has to be set to have a total length equal to or less than the distance between the pair of short side walls 13. Therefore, when the intermediate press-formed product 251 is press-formed, the mandrel 510 is not brought into contact with a part of the web portion 252 and the vertical wall portion 253 of the intermediate press-formed product 251.
- the mandrel 610 since the mandrel 610 according to the present embodiment can be expanded and contracted as will be described later, the mandrel 610 is always applied to the entire web portion 252 and the vertical wall portion 253 of the intermediate press-formed product 251. Can be brought into contact with each other.
- FIG. 51 is an enlarged front view showing the mandrel 610.
- the mandrel 610 according to the present embodiment is different from the mandrel 510 according to the fifth embodiment in that a plurality of divided bodies 611 includes a slide body 616 and an elastic body 617.
- the divided body 611 of the mandrel 610 includes a recess 613 provided at an end portion in the longitudinal direction of the divided body 611, a plate-like slide body 616 disposed inside the recess 613, and a slide body 616. It is comprised from the elastic body 617 which urges
- the slide body 616 is urged toward the stopper 514 by an elastic body 617.
- the slide body 616 moves inside the recess 613 within a range limited by the elastic body 617 with the end surface 616a in contact with the inner surface of the recess 613.
- the elastic body 617 has one end connected to the slide body 616 and the other end connected to the bottom surface 613 a of the recess 613.
- the elastic body 617 is, for example, a coil spring or a leaf spring. Further, the engaging portion 522 of the connecting body 520 inserted into the recess 613 is disposed between the slide body 616 and the stopper 514.
- the divided body 611 of the mandrel 610 further includes a receiving portion 618 that is provided on the slide body 616 and has a receiving surface 618a that contacts the engaging portion 522 of the connecting body 520. Also good. In this case, the engaging portion 522 of the connecting body 520 is held by the receiving portion 618 of the slide body 616, so that the engaging portion 522 of the connecting body 520 moves smoothly.
- the shape of the slide body 616 of the mandrel 610 may be U-shaped, and two stoppers 514 may be provided in the recess 613, for example. Also in this case, the slide body 616 can be moved smoothly.
- the length of the elastic body 617 is the initial length as shown in FIG.
- the engaging part 522 of the coupling body 520 is located closer to the stopper 514. Since the engaging portion 522 of the connection body 520 is positioned closer to the stopper 514, the range in which the connection body 520 can be tilted becomes relatively wide. Therefore, the relative position of the adjacent divided bodies 611 connected by the connecting body 520 is variable in the vertical direction.
- the adjacent divided bodies 611 approach each other via the connecting body 520 and are adjacent to each other with a predetermined interval, or the divided bodies 611 are in contact with each other. Moreover, it will be in the state with which the several division body 611 was arranged in a line. Therefore, the entire length of the mandrel 610 is shortened by lowering the upper mold 220.
- FIGS. 54 to 56 are schematic front views showing the divided body 611 of the mandrel 610 and the connecting body 520 that connects the adjacent divided bodies 611.
- the mandrel 610 has a central divided body 611X in accordance with the shape of the web portion 252 of the intermediate press-formed product 251 and others. It is in a relatively high position with respect to the divided body 611.
- the other divided bodies 611 are gradually lowered in height with distance from the divided body 611X.
- each divided body 611 follows the deformation of the web portion 252 of the intermediate press-formed product 251.
- the split bodies 611 positioned at both ends of the mandrel 610 are restrained by the pair of short side walls 13 that restrain both ends in the longitudinal direction of the intermediate press-formed product 251.
- the upper mold 220 is further lowered and the bent portion 252b of the web portion 252 of the intermediate press-formed product 251 is extended, the heights of the divided bodies 611 become the same.
- compressive stress is applied to the mandrel 610, the elastic body 617 is compressed and contracted, and the interval between the divided bodies 611 is narrowed.
- the reason why compressive stress is applied to the mandrel 610 is as follows. That is, the total length of the intermediate press-formed product 251 is L1 in a state before the upper mold 220 is lowered, whereas the upper mold 220 and the pair of short sides are in the state in which the upper mold 220 is lowered. The wall 13 is compressed until the total length of the intermediate press-formed product 251 becomes L. As a result, the compressive stress acts on the mandrel 610 disposed along the web portion 252 of the intermediate press-formed product 251 by the upper mold 220 and the pair of short side walls 13.
- FIG. 55 shows an example of the mandrel 610 in a state where the upper mold 220 is lowered to the bottom dead center.
- the intervals between the divided bodies 611 are the same.
- the spring constant of the elastic body 617, the length of the coupling body 520, the depth of the recess 613, and the like may be adjusted.
- FIG. 56 shows another example of the mandrel 610 in a state where the upper mold 220 is lowered to the bottom dead center.
- the distance between some of the divided bodies 611 is smaller than the distance between other divided bodies 611.
- the distance between the central divided body 611X and the two divided bodies 611 adjacent thereto is relatively small, and the distance between the other divided bodies 611 is relatively wide.
- the central divided body 611X and the two divided bodies 611 adjacent thereto are located in the vicinity of the bent portion 252b of the web portion 252 of the intermediate press-formed product 251.
- the divided bodies 611 in the vicinity of the bending portion 252b where buckling easily occurs are close to each other in a state where the upper mold 220 is lowered to the bottom dead center.
- the spring constant of the elastic body 617, the length of the coupling body 520, the depth of the recess 613, and the like may be adjusted.
- the spring constants of the central divided body 611X and the elastic bodies 617 of the two divided bodies 611 adjacent thereto may be made smaller than the spring constants of the other elastic bodies 617.
- the mandrel 610 that can be extended and contracted is used, the mandrel 610 is inserted along the web portion 252 of the intermediate press-formed product 251, and the intermediate press-formed product is shortened while reducing the overall length of the mandrel 610. 251 is press-molded. As a result, the entire intermediate press-formed product 251 can be restrained by the mandrel 610, and the buckling deformation of the web portion 252 and the vertical wall portion 253 can be reliably prevented.
- FIGS. 57 and 58 are diagrams showing a modification of the mandrel 610.
- FIG. As shown in FIGS. 57 and 58, the divided body 611 of the mandrel 610 may be provided with a connecting body 620 instead of the slide body 616, the elastic body 617, and the connecting body 520.
- the main body 621 of the connector 620 includes two divided main bodies 621a and 621b.
- the divided main body portions 621a and 621b are configured by dividing the main body portion 621 into two at the center in the longitudinal direction.
- Each of the divided main body portions 621a and 621b has one end in the longitudinal direction connected to the engaging portion 522, and has a cutout portion 621c and a protruding portion 621d provided at the other end.
- the notch 621c and the protrusion 621d are configured to be fitted to each other.
- an elastic body 617 is provided at the tip of the protruding portion 621d of the divided main body 621a, and a slide pin 621e is provided at the tip of the protruding portion 621d of the divided main body 621b.
- the elastic body 617 is connected to the notch 621c of the divided main body 621b.
- the slide pin 621e is inserted into an insertion hole (not shown) provided in the notch 621c of the divided main body 621a.
- the elastic body 617 By disposing the elastic body 617 between the divided main body portions 621a and 621b, the divided main body portions 621a and 621b are separated from each other.
- the mandrel 610 shown in FIGS. 57 and 58 has the elastic body 617 compressed when the compressive stress is applied along the longitudinal direction, and the interval between the divided main body portions 621a and 621b is reduced.
- the total length of the coupling body 620 can be shortened. Therefore, like the present embodiment, the entire length of the mandrel 610 can be expanded and contracted.
- connection body 620 a connection body 625 shown in FIG. 59 may be used instead of the connection body 620.
- FIG. 59 is a plan view showing the connection body 625.
- the connecting body 625 is configured by dividing the connecting body 525 shown in FIG.
- the plate-like main body 626 of the connecting body 625 shown in FIG. 59 is composed of two divided main bodies 627 and 628.
- the divided main body portions 627 and 628 are configured by dividing the main body portion 626 into two at substantially the center in the longitudinal direction.
- a protruding portion 627a is provided at the center in the width direction of one of the divided main body portions 627. Further, a notch 628 a is provided in the center of the other divided main body 628 in the width direction.
- an elastic body 617 is provided at the tip of the protruding portion 627a. The elastic body 617 is connected to the notch 628 a of the divided main body 628.
- slide pins 629 are provided on end surfaces 627b on both sides in the width direction of the projecting portion 627a of the divided main body portion 627. The slide pin 629 is inserted into an insertion hole (not shown) provided in the end surface 628b of the divided main body 628.
- the entire length of the connecting body 625 can be expanded and contracted similarly to the connecting body 620.
- the 61 and 62 are front views showing a press-formed product manufacturing apparatus 700 (hereinafter also simply referred to as manufacturing apparatus 700) according to the seventh embodiment.
- the manufacturing apparatus 700 according to the present embodiment includes the manufacturing apparatus 1 according to the first embodiment and the mandrel 610 according to the sixth embodiment.
- the intermediate press-formed product 761 shown in FIGS. 60A to 60C is press-molded using the manufacturing apparatus 700. As shown in FIGS. 60A to 60C, the intermediate press-formed product 761 has a web portion 762 and a pair of vertical wall portions 763. The intermediate press-formed product 761 is different from the intermediate press-formed product 251 (see FIGS. 24A and 24B) in that it has three bent portions 252b and four straight portions 252a.
- FIG. 63 is a diagram showing a state in which the intermediate press-formed product 761 is press-formed using the manufacturing apparatus 700.
- the mandrel 610 changes according to the shape of the intermediate press-formed product 761, buckling deformation of the intermediate press-formed product 761 can be prevented.
- an intermediate press-formed product 771 shown in FIGS. 64A to 64C may be used.
- the intermediate press-formed product 771 has a web portion 772 and a pair of vertical wall portions 773.
- the intermediate press-formed product 771 is different from the intermediate press-formed product 251 (see FIGS. 24A and 24B) in that it has four bent portions 252b and five straight portions 252a.
- the intermediate press-formed product 771 may be arranged in the manufacturing apparatus 700 as shown in FIG.
- an intermediate press-formed product 781 shown in FIGS. 66A to 66C may be used.
- the intermediate press-formed product 781 has a web portion 782 and a pair of vertical wall portions 783.
- the intermediate press-formed product 781 is different from the intermediate press-formed product 351 (see FIGS. 33A to 33C) in that it includes two bent portions 252b, six straight portions 252a, and three bent portions 352c.
- the intermediate press-formed product 781 may be arranged in the manufacturing apparatus 700 as shown in FIG. In this case, it is preferable to provide the shaft portion 515 in the divided body 611 of the mandrel 610 that contacts the bent portion 252b of the intermediate press-formed product 781.
- an intermediate press-formed product 791 shown in FIGS. 68A to 68C may be used.
- the intermediate press-formed product 791 has a web portion 792, a pair of vertical wall portions 793, and a flange portion 794.
- the intermediate press-formed product 791 is different from the intermediate press-formed product 761 (see FIGS. 60A to 60C) in that it has a flange portion 794.
- the intermediate press-formed product 791 may be disposed in the manufacturing apparatus 700 as shown in FIG.
- FIG. 70 is a perspective view showing a press-formed product manufacturing apparatus 800 (hereinafter also simply referred to as manufacturing apparatus 800) according to the eighth embodiment.
- manufacturing apparatus 800 the case where the pair of short side wall 13 of the manufacturing apparatus 1 was fixed to the base part 11 was shown (refer FIG. 2).
- the short side wall 814 pressure restraint wall
- the short side wall 813 fixed restraint wall
- the intermediate press-formed product 51 is press-molded.
- FIG. 71A is a front view showing the manufacturing apparatus 800 and shows a state before the upper mold 820 is lowered.
- the lower mold 810 is provided on the base 11, the short side wall 813 (fixed restraint wall) fixed to the upper surface 11a of the base 11, and the upper surface 11a of the base 11.
- a short side wall 814 pressure restraint wall moving on the portion 11, a cam slider 815 joined to the short side wall 814, a support portion 816 fixed on the base portion 11, and the support portion 816.
- the slide pin 817 is connected to the cam slider 815, and the return spring 818 connects the support portion 816 and the slide pin 817.
- the cam slider 815 is provided with an inclined slide surface 815a.
- the slide pin 817 is urged in a direction away from the short side wall 814 by a return spring 818.
- the slide pin 817 can be inserted into and removed from the support portion 816 along the longitudinal direction.
- the cam slider 815 fixed to the slide pin 817 slides along the longitudinal direction of the slide pin 817.
- a concave portion 813a On the surface of the short side wall 813 facing the short side wall 814, a concave portion 813a, a plate-shaped work receiving portion 813b, a hinge 813c, and a spring member 813d (elastic body) are provided.
- the work receiving portion 813b is connected to the short side wall 813 via a hinge 813c. Therefore, the workpiece receiving portion 813b is movable with respect to the short side wall 813 about the hinge 813c.
- the workpiece receiving portion 813b When the workpiece receiving portion 813b is closest to the short side wall 813, the workpiece receiving portion 813b is accommodated in the recess 813a. Further, a spring member 813d is disposed between the work receiving portion 813b and the short side wall 813. The spring member 813d biases the work receiving portion 813b toward the short side wall 814.
- a concave portion 814a, a plate-shaped workpiece receiving portion 814b, a hinge 814c, and a spring member 814d are also provided on the surface of the short side wall 814 facing the short side wall 813.
- the work receiving portion 814b is connected to the short side wall 814 via a hinge 814c. Therefore, the workpiece receiving portion 814b is movable with respect to the short side wall 814 about the hinge 814c.
- the workpiece receiving portion 814b When the workpiece receiving portion 814b is closest to the short side wall 814, the workpiece receiving portion 814b is accommodated in the recess 814a. Further, a spring member 814d is disposed between the work receiving portion 814b and the short side wall 814. The spring member 814d biases the workpiece receiving portion 814b toward the short side wall 813.
- the upper mold 820 includes a main body part 21, a punch part 22, a convex part 23, and a cam driver 825 attached to the punch part 22.
- the cam driver 825 is provided with an inclined slide surface 825a.
- cam driver 825 of the upper mold 820 is lowered toward the cam slider 815 of the lower mold 810, the cam slider 815 is brought into contact with the inclined surface 815a of the cam slider 815 and the inclined surface 825a of the cam driver 825. And the cam driver 825 are positioned.
- the intermediate press-formed product 51 is disposed between the upper mold 820 and the lower mold 810.
- the intermediate press-formed product 51 is arranged so that the convex side (extension surface) of the bent portion 52 b of the intermediate press-formed product 51 faces the upper mold 820.
- both longitudinal ends of the intermediate press-formed product 51 are brought into contact with the work receiving portions 813b and 814b.
- the work receiving portions 813b and 814b are pressed against both longitudinal ends of the intermediate press-formed product 51 by the spring members 813d and 814d. In this way, both ends in the longitudinal direction of the intermediate press-formed product 51 are constrained by the short side walls 813 and 814.
- FIG. 71B is a diagram showing a state where the upper mold 820 is lowered.
- the cam driver 825 contacts the cam slider 815 as the upper mold 820 is lowered. Further, as the cam driver 825 descends, the cam slider 815 slides toward the short side wall 813 against the spring force of the return spring 818. As the cam slider 815 slides, the short side wall 814 slides toward the short side wall 813.
- the short side wall 814 slides, and the convex portion 23 of the upper mold 820 comes into contact with the web portion 52 of the intermediate press-formed product 51 so that the intermediate press-formed product 51 is moved in the longitudinal direction. Compressed.
- the short side wall 814 slides toward the short side wall 813, the distance between the short side walls 813 and 814 decreases as the upper mold 820 descends. Therefore, the longitudinal compressive force applied to the intermediate press-formed product 51 can be increased.
- both ends in the longitudinal direction of the intermediate press-formed product 51 are on the upper surface of the base portion 11 as shown in FIGS. 71A and 71B before the press molding is started. It is inclined with respect to 11a. However, as the press molding proceeds, the inclination angles at both ends in the longitudinal direction of the intermediate press-formed product 51 become perpendicular to the upper surface 11 a of the base portion 11.
- the intermediate press-formed product 51 remains at both ends in the longitudinal direction thereof restricted by the work receiving portions 813b and 814b.
- the intermediate press-formed product 51 is pressed so as to reduce the curvature of the bent portion 52b of the intermediate press-formed product 51 while reducing the distance between the short side wall 813 and the short side wall 814. Since molding is performed, it is possible to reliably apply compressive stress along the longitudinal direction to the intermediate press-formed product 51. Further, since the upper mold 820 is lowered while the workpiece receiving portions 813b and 814b are in contact with both longitudinal ends of the intermediate press-formed product 51, a load is evenly applied to both longitudinal ends of the intermediate press-formed product 51. Thus, compressive stress can be applied without buckling both ends of the intermediate press-formed product 51. Further, since the axial compression force can be easily released at the time of mold release and the press-molded product can be taken out, it is possible to prevent the molded product from popping out due to the elastic recovery of the press-molded product.
- an intermediate press-formed product 861 shown in FIGS. 72A to 72C may be used.
- the intermediate press-formed product 861 has a web portion 862 and a pair of vertical wall portions 863.
- the intermediate press-formed product 861 is different from the intermediate press-formed product 451 (see FIGS. 39A to 39C) in that the short sides 863a and 863b of the vertical wall portion 863 are not parallel to each other.
- the intermediate press-formed product 861 can be compressed in the longitudinal direction by placing the intermediate press-formed product 861 in the manufacturing apparatus 800 and lowering the upper mold 820.
- an intermediate press-formed product 871 shown in FIGS. 74A to 74C may be used.
- the intermediate press-formed product 871 has a web portion 872 and a pair of vertical wall portions 873.
- the intermediate press-formed product 871 is different from the intermediate press-formed product 761 (see FIGS. 60A to 60C) in that the short sides 873a and 873b of the vertical wall portion 873 are non-parallel to each other.
- the intermediate press-formed product 871 can be compressed in the longitudinal direction by placing the intermediate press-formed product 871 in the manufacturing apparatus 800 and lowering the upper mold 820. In this case, it is preferable to arrange a wrinkle pressing pad 331 (see FIGS. 32A to 32C) between the pair of vertical wall portions 873 of the intermediate press-formed product 871.
- an intermediate press-formed product 881 shown in FIG. 76 may be used.
- the intermediate press-formed product 881 is different from the intermediate press-formed product 251 (see FIGS. 24A and 24B) in that it has semicircular flange portions 884 provided at both ends in the longitudinal direction. The pair of flange portions 884 are not parallel to each other.
- the intermediate press-formed product 881 is arranged in the manufacturing apparatus 800 so that the flange portion 884 of the intermediate press-formed product 881 contacts the work receiving portions 813a and 814b, and the upper mold 820 is lowered. By doing so, the intermediate press-formed product 881 can be compressed in the longitudinal direction.
- an intermediate press-formed product 886 shown in FIG. 78 may be used.
- the intermediate press-formed product 886 differs from the intermediate press-formed product 881 (see FIG. 76) in that it has three rectangular flange portions 887 at both ends in the longitudinal direction.
- an intermediate press-formed product 888 shown in FIG. 79 may be used.
- the intermediate press-formed product 888 is different from the intermediate press-formed product 881 (see FIG. 76) in that a flange portion 889 is provided at the end in the width direction of the vertical wall portion 253.
- an intermediate press-formed product 251 (see FIGS. 24A and 24B) can also be used.
- the lower mold 810 since both ends in the longitudinal direction of the intermediate press-formed product 251 are parallel to each other, the lower mold 810 is not provided with the work receiving portions 813b and 814b, the recesses 813a and 814a, and the spring members 813d and 814d. May be.
- FIG. 81 is a schematic diagram showing a manufacturing apparatus 900 (hereinafter also simply referred to as manufacturing apparatus 900) according to the ninth embodiment. As shown in FIG. 81, the manufacturing apparatus 900 is different from the manufacturing apparatus 800 according to the eighth embodiment in that the manufacturing apparatus 900 includes a punch part 222 (see FIG. 25A) having a recess 223 and a mandrel 610 (see FIG. 50). Yes.
- the manufacturing apparatus 900 is used when the intermediate press-formed product 951 is press-molded.
- the intermediate press-formed product 951 has longitudinal ends that are not parallel to each other, and the other configuration is the same as that of the intermediate press-formed product 251 (see FIG. 24A).
- FIG. 82A to 82C are longitudinal sectional views showing the manufacturing apparatus 900.
- FIG. 82B is a diagram showing a state where the upper mold 920 is being lowered
- FIG. 82C is a diagram showing a state where the upper mold 920 is lowered to the bottom dead center.
- the intermediate press-formed product 951 is arranged in the manufacturing apparatus 900 so that both ends in the longitudinal direction of the intermediate press-formed product 951 are in contact with the work receiving portions 813b and 814b.
- the mandrel 610 is inserted into a space surrounded by the web portion 952 and the pair of vertical wall portions 953 of the intermediate press-formed product 951.
- the upper mold 920 is lowered to press-mold the intermediate press-formed product 951.
- the web portion 952 and the vertical wall portion 953 of the intermediate press-formed product 951 are sandwiched between the recess 223 of the upper mold 920 and the mandrel 610. Therefore, it is possible to prevent buckling deformation when the intermediate press-formed product 951 is compressed in the longitudinal direction.
- the intermediate press-formed product 951 is sandwiched between the mandrel 610 and the recess 223 of the upper mold 920, and the intermediate press-formed product 951 is compressed in the longitudinal direction. Therefore, buckling deformation of the intermediate press-formed product 951 can be reliably prevented with respect to the manufacturing apparatus 800 of the eighth embodiment.
- the intermediate press-formed product is formed by one stroke (the number of times the upper mold is lowered is 1) is shown.
- the intermediate press-formed product may be press-molded by a plurality of strokes (a plurality of times of lowering the upper mold). That is, as shown in FIGS. 83A ⁇ FIG 83C, and m k curvature m o of the intermediate press molded article 51 at the first stroke, also the curvature m k of the intermediate press molded article 51 in the second stroke as m n Good.
- the intermediate press-formed product has a bent portion due to plastic deformation is shown.
- a steel material having a bent portion due to its own weight that is, a bent portion formed by elastic deformation
- the eighth embodiment shows a case where the short side wall 814 approaches the short side wall 13 by the cam driver 825 of the upper mold 820 coming into contact with the cam slider 815 of the lower mold 810. It was.
- another slide mechanism may be provided in the lower mold 810, and the upper mold 820 and the lower mold 810 may be controlled independently.
- the intermediate press-formed product may be curved in the thickness direction of the web portion, and the direction of bending and the amount of bending may be adjusted as appropriate.
- the intermediate press-formed product may be curved in an arc shape or may be curved in an elliptical arc shape.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
- Forging (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
Description
本願は、2014年3月4日に日本に出願された特願2014-042144号、2014年3月19日に日本に出願された特願2014-057177号、及び2014年10月10日に日本に出願された特願2014-209361号に基づき優先権を主張し、その内容をここに援用する。
(1)本発明の第1の態様に係るプレス成形品の製造方法は、曲げ部を有する長尺材を準備する第1工程と;前記長尺材の長手方向における両端を拘束しながら、前記曲げ部の曲率を小さくする第2工程と;を備える。
(2)上記(1)に記載の態様において、前記第2工程で、前記長尺材の前記両端間の最短距離を一定に保ちつつ、前記曲率を小さくしてもよい。
(3)上記(1)に記載の態様において、前記第2工程で、前記長尺材の前記両端間の最短距離を縮めつつ、前記曲率を小さくしてもよい。
(4)上記(1)~(3)のいずれか一項に記載の態様において、前記第2工程で、前記長尺材の少なくとも前記曲げ部の凹側を支持しながら、前記曲率を小さくしてもよい。
(5)上記(1)~(4)のいずれか一項に記載の態様において、前記第2工程で、前記曲率を段階的に小さくしてもよい。
(6)上記(1)~(5)のいずれか一項に記載の態様において、前記長尺材の前記両端の端縁を含む平面が互いに平行であってもよい。
(8)上記(7)に記載の態様において、前記一対の拘束壁間の距離が、前記長尺材の長手方向における両端間の最短距離に等しくてもよい。
(9)上記(7)または(8)に記載の態様において、前記一対の拘束壁のそれぞれが、前記拘束壁間に前記長尺材が挿入されるときに前記長尺材の前記長手方向の端部が当接する曲面形状のガイド面を有してもよい。
(10)上記(7)~(9)のいずれか一項に記載の態様において、前記一対の拘束壁間に配置され、前記長尺材の少なくとも前記曲げ部の凹側に当接する支持面を有するしわ押さえ治具をさらに備えてもよい。
(11)上記(7)に記載の態様において、前記一対の拘束壁の一方が、前記ベース部に固定された固定拘束壁であってもよく;前記一対の拘束壁の他方が、前記パンチ部を前記長尺材の前記曲げ部の前記凸側に当接させながら移動させる際に、前記固定拘束壁に向かって接近する加圧拘束壁であってもよい。
(12)上記(11)に記載の態様において、前記固定拘束壁および前記加圧拘束壁の少なくとも一方は、前記長尺材の一端に当接するワーク受け部と、前記ワーク受け部を、前記長尺材の前記一端に向けて付勢する弾性体とを有していてもよい。
(13)上記(11)または(12)に記載の態様において、前記固定拘束壁と前記加圧拘束壁との間に配置され、前記長尺材の少なくとも前記曲げ部の凹側に当接する支持面を有するしわ押さえ治具をさらに備えていてもよい。
(15)上記(14)に記載の態様において、前記各分割体が、前記各分割体が一列に並んだ際に前記連結体を収容する凹部と、前記凹部の底面と前記凹部内に挿入されている前記連結体の端部との間に設けられた弾性体と、を有してもよい。
(16)上記(14)に記載の態様において、前記各連結体が、所定範囲内で互いに接近離間自在な一対の分割連結体と、前記一対の分割連結体間に設けられ、前記一対の分割連結体を相互に離間させる方向に付勢する弾性体と、を有してもよい。
(18)上記(17)に記載の態様において、前記高断面積部が、前記長手方向に沿って複数個所に設けられていてもよい。
また、長尺材を長手方向に圧縮するので、長尺材の加工硬化により降伏強度を高めることができる。
また、曲げ部に対応する箇所の断面積が増加するので、長尺材の曲げ部の位置を任意に選択することにより、所望の箇所の断面積を増加させることができる。
また、断面積が長手方向に沿って連続的に変化する中間部を有するので、高断面積部と低断面積部との境界に応力が集中することを避けることができる。
図2は、本発明の第1実施形態に係るプレス成形品の製造装置1(以下、単に製造装置1とも称する)を示す斜視図である。製造装置1は、中間プレス成形品51を押圧して、プレス成形品101(図5A~図5C参照)を製造する際に用いられる。以下では、まず、中間プレス成形品51について説明する。
λ=L1/r ・・・(1)
上記の式(1)において、L1は、中間プレス成形品の全長であり(図1B参照)、rは、中間プレス成形品51の断面二次モーメントIおよび断面積Aを用いて以下の式(2)で表される断面二次半径である。
r=(I/A)1/2 ・・・(2)
細長比λを100以上とすることにより、中間プレス成形品51を製造する際の曲げ加工を容易に行うことができる。
また、厚肉部102cと薄肉部102dとの間に中間部102eが設けられるので、厚肉部102cと薄肉部102dとの間の境界に応力が集中することを避けることができる。
本実施形態では、中間プレス成形品51よりプレス成形品101を製造する場合を示した。しかしながら、中間プレス成形品51に代えて、他の中間プレス成形品を用いることにより、種々のプレス成形品を製造することができる。図7A~図7Cは、中間プレス成形品61を示す図である。なお、図7Aは斜視図であり、図7Bは正面図であり、図7Cは側面図である。図7A~図7Cに示すように、中間プレス成形品61は、中間プレス成形品51と同様に、ウエブ部62および一対の縦壁部63を有する。ここで、中間プレス成形品61のウエブ部62は、曲げ部62bからなり、全体が湾曲した形状となっている。
次に、本発明の第2実施形態について説明する。
次に、本発明の第3実施形態について説明する。
次に、本発明の第4実施形態について説明する。
次に、本発明の第5実施形態について説明する。
また、マンドレル510は、中間プレス成形品251のウエブ部252の変形に追従して、円弧状から直線状に分割体511の並びの形状に変移する(分割体間の位置関係が変化する)。そのため、上部成形型220を下死点まで下降させる間、中間プレス成形品251のウエブ部252および縦壁部253にマンドレル510を当接させることができる。
次に、本発明の第6実施形態について説明する。
図57および図58は、マンドレル610の変形例を示す図である。図57および図58に示すように、マンドレル610の分割体611には、スライド体616、弾性体617、および連結体520に代えて、連結体620を設けてもよい。
次に、本発明の第7実施形態について説明する。
次に、本発明の第8実施形態について説明する。
また、中間プレス成形品51の長手方向両端にワーク受け部813b、814bを当接させたまま、上部成形型820を下降させるので、中間プレス成形品51の長手方向両端に均等に荷重を加えることができ、中間プレス成形品51の両端を座屈させずに、圧縮応力を印加させることができる。
また、離型時に軸圧縮力を容易に解放させてプレス成形品を取り出せるため、プレス成形品の弾性回復による成形品の飛び出しを防止できる。
次に、本発明の第9実施形態について説明する。
10: 下部成形型(第1成形型)
11: ベース部
12: 長辺壁
13: 短辺壁(拘束壁)
14: 溝部
20: 上部成形型(第2成形型)
21: 本体部
22: パンチ部
23: 凸部
51: 中間プレス成形品
52: ウエブ部
52a: ウエブ部の直線部
52b: ウエブ部の曲げ部
53: 縦壁部
53a、53b: 縦壁部の短辺
200: プレス成形品の製造装置(第2実施形態)
210: 下部成形型
214: ベース部の凸部
220: 上部成形型
222: パンチ部
223: 凹部
251: 中間プレス成形品
252: ウエブ部
252a: ウエブ部の直線部
252b: ウエブ部の曲げ部
253: 縦壁部
253a、253b: 縦壁部の短辺
300: プレス成形品の製造装置(第3実施形態)
331: しわ押さえパッド(しわ押さえ治具)
400: プレス成形品の製造装置(第4実施形態)
500: プレス成形品の製造装置(第5実施形態)
510: マンドレル
511: 分割体
520: 連結体
600: プレス成形品の製造装置(第6実施形態)
610: マンドレル
611: 分割体
613: 凹部
616: スライド体
617: 弾性体
700: プレス成形品の製造装置(第7実施形態)
800: プレス成形品の製造装置(第8実施形態)
810: 下部成形型
813: 短辺壁(固定拘束壁)
814: 短辺壁(加圧拘束壁)
815: カムスライダ
816: 支持部
817: スライドピン
818: リターンスプリング
820: 上部成形型
825: カムドライバ
900: プレス成形品の製造装置(第9実施形態)
920: 上部成形型
Claims (18)
- 曲げ部を有する長尺材を準備する第1工程と;
前記長尺材の長手方向における両端を拘束しながら、前記曲げ部の曲率を小さくする第2工程と;
を備えることを特徴とするプレス成形品の製造方法。 - 前記第2工程で、前記長尺材の前記両端間の最短距離を一定に保ちつつ、前記曲率を小さくすることを特徴とする請求項1に記載のプレス成形品の製造方法。
- 前記第2工程で、前記長尺材の前記両端間の最短距離を縮めつつ、前記曲率を小さくすることを特徴とする請求項1に記載のプレス成形品の製造方法。
- 前記第2工程で、前記長尺材の少なくとも前記曲げ部の凹側を支持しながら、前記曲率を小さくすることを特徴とする請求項1~3のいずれか一項に記載のプレス成形品の製造方法。
- 前記第2工程で、前記曲率を段階的に小さくすることを特徴とする請求項1~4のいずれか一項に記載のプレス成形品の製造方法。
- 前記長尺材の前記両端の端縁を含む平面が互いに平行であることを特徴とする請求項1~5のいずれか一項に記載のプレス成形品の製造方法。
- 曲げ部を有する長尺材よりプレス成形品を製造する装置であって、
ベース部と、前記ベース部に設けられてかつ前記長尺材の長手方向における両端が当接すると共に互いに対向する一対の拘束壁とを有する第1成形型と;
前記一対の拘束壁間に挿入された前記長尺材の前記曲げ部の凸側を押圧するパンチ部を有する第2成形型と;
を備え、
前記一対の拘束壁間の距離が、前記長尺材を直線状に伸ばした場合の全長よりも小さい
ことを特徴とするプレス成形品の製造装置。 - 前記一対の拘束壁間の距離が、前記長尺材の長手方向における両端間の最短距離に等しいことを特徴とする請求項7に記載のプレス成形品の製造装置。
- 前記一対の拘束壁のそれぞれが、前記拘束壁間に前記長尺材が挿入されるときに前記長尺材の前記長手方向の端部が当接する曲面形状のガイド面を有することを特徴とする請求項7又は8に記載のプレス成形品の製造装置。
- 前記一対の拘束壁間に配置され、前記長尺材の少なくとも前記曲げ部の凹側に当接する支持面を有するしわ押さえ治具をさらに備えることを特徴とする請求項7~9のいずれか一項に記載のプレス成形品の製造装置。
- 前記一対の拘束壁の一方が、前記ベース部に固定された固定拘束壁であり;
前記一対の拘束壁の他方が、前記パンチ部を前記長尺材の前記曲げ部の前記凸側に当接させながら移動させる際に、前記固定拘束壁に向かって接近する加圧拘束壁である
ことを特徴とする請求項7に記載のプレス成形品の製造装置。 - 前記固定拘束壁および前記加圧拘束壁の少なくとも一方は、
前記長尺材の一端に当接するワーク受け部と、
前記ワーク受け部を、前記長尺材の前記一端に向けて付勢する弾性体と
を有することを特徴とする請求項11に記載のプレス成形品の製造装置。 - 前記固定拘束壁と前記加圧拘束壁との間に配置され、前記長尺材の少なくとも前記曲げ部の凹側に当接する支持面を有するしわ押さえ治具をさらに備えることを特徴とする請求項11または12に記載のプレス成形品の製造装置。
- 請求項7~13のいずれか一項に記載のプレス成形品の製造装置に用いられるマンドレルであって、
前記長尺材の凹側を支持する複数の分割体と;
前記各分割体間を連結する連結体と;
を備え、
前記長尺材の前記曲げ部の形状に応じて前記各分割体の並びの形状が変移する
ことを特徴とするマンドレル。 - 前記各分割体が、
前記各分割体が一列に並んだ際に前記連結体を収容する凹部と、
前記凹部の底面と前記凹部内に挿入されている前記連結体の端部との間に設けられた弾性体と、
を有することを特徴とする請求項14に記載のマンドレル。 - 前記各連結体が、
所定範囲内で互いに接近離間自在な一対の分割連結体と、
前記一対の分割連結体間に設けられ、前記一対の分割連結体を相互に離間させる方向に付勢する弾性体と、
を有することを特徴とする請求項14に記載のマンドレル。 - 一方向に長いプレス成形品であって、
長手方向に垂直な断面で見た場合に最も断面積が大きい高断面積部と;
前記高断面積部よりも断面積が小さい低断面積部と;
前記高断面積部と前記低断面積部との間に設けられ、断面積が前記長手方向に沿って連続的に変化する中間部と;
を備えることを特徴とするプレス成形品。 - 前記高断面積部が、前記長手方向に沿って複数個所に設けられていることを特徴とする請求項17に記載のプレス成形品。
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Also Published As
Publication number | Publication date |
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KR20160103091A (ko) | 2016-08-31 |
CN108202093B (zh) | 2019-12-31 |
CN108202093A (zh) | 2018-06-26 |
US20160325330A1 (en) | 2016-11-10 |
CN110405021B (zh) | 2020-12-01 |
MX2016009900A (es) | 2016-10-28 |
KR101871087B1 (ko) | 2018-06-25 |
JPWO2015133464A1 (ja) | 2017-04-06 |
CN105939794A (zh) | 2016-09-14 |
CN110405021A (zh) | 2019-11-05 |
US10695814B2 (en) | 2020-06-30 |
CN105939794B (zh) | 2019-01-15 |
JP6202189B2 (ja) | 2017-09-27 |
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