JP5636765B2 - PRESS MOLDING METHOD, PRESS MOLDING DEVICE, PRESS MOLDED PRODUCTION METHOD, AND PRESS MOLDED PRODUCT - Google Patents

Description

  The present invention relates to a press molding method, a press molding apparatus, a method for manufacturing a press molded product, and a press molded product.

  In general, press molding is performed in which a plate material having a constant thickness is press-molded to obtain a vehicle part or the like. Since stress tends to concentrate on a welded part that joins another article in a part, it is required to have rigidity compared to other parts. For this reason, the design which made the plate | board thickness of the site | part corresponded to a welding part thick may be performed. However, when designing the thickness of not only the welded portion but also the entire plate material, the material cost increases and the product weight increases.

  Patent document 1 is disclosing the press molding method for shape | molding the press molded product which made a part of board | plate material thin. After a flat steel material is formed into a cross-sectional hat shape by a punch, the portion stretched by the punch is pressed in the thickness direction to reduce the thickness (see Patent Document 1).

JP 2002-192242 A

  In the above technique, a bending wrinkle is attached to the plate material in order to perform the process of forming a cross-sectional hat shape. Due to the influence of the spring back generated in the plate material, it is difficult to form a flat cross-sectional shape, and the molding quality of the press-formed product is deteriorated.

  For example, by pulling the plate material while restraining it in the plate thickness direction by the clamp device, it becomes possible to perform the thin-wall molding without attaching bending folds. However, when using a clamping device that applies a restraining force by a frictional force while sandwiching the plate material in the thickness direction, incorporate a larger clamping device or its peripheral equipment to obtain a larger restraining force. Is required. Thereby, the problem of causing the enlargement of a press molding apparatus will arise.

  The present invention has been made to solve the above-mentioned problems, and aims to provide a press molding technique capable of improving the molding quality and suppressing the increase in size of the press molding apparatus accompanying the installation of the clamp device. It is said.

In order to achieve the above object, the press molding method of the present invention is such that each of the hooking means is relative to each other in a state in which the hooking means for hooking the locking part is hooked to each of at least two locking parts formed on a part of the plate. The plate is pulled apart by moving it away. As a result, a thin-walled portion having a thickness that is smaller than the thickness of the base material is formed. And the latching | locking part contains the burring.

  According to the press molding method according to the present invention, the hooking means hooked on the locking portion is moved, and the plate material is stretched in the surface direction by utilizing the resistance in the pulling direction of the locking portion, so that the thin wall molding is performed. The surface can be formed into a smooth surface shape without bending the molded product. For this reason, the molding quality of the press-molded product can be improved, and as a result, the product quality of the product to which the press-molded product is applied can be improved. Since the plate material is supported by utilizing the resistance in the pulling direction of the locking part, there is no need to install a separate clamping device that applies a restraining force in the thickness direction of the plate, and the press molding device is enlarged due to the installation of the clamping device. Can be suppressed.

1 (A) and 1 (B) are diagrams showing a plate material and a preformed product, (A) is a perspective view showing a state before and after press molding, and (B) is a cross section showing a state before and after press molding. FIG. It is a perspective view which shows the press molded product which provided the molded product shape. FIGS. 3A and 3B are views for explaining a product formed by welding a press-formed product and another article, and FIG. 3A is a perspective view showing the entire product, FIG. These are figures which show the cross section of the press-formed product in alignment with the 3B-3B line of (A). It is sectional drawing which simplifies and shows the press molding apparatus which concerns on 1st Embodiment. FIGS. 5A to 5C are enlarged views of a part of the press molding apparatus. 6 (A) and 6 (B) are diagrams showing a molding press die for imparting a molded product shape to the preform, and (A) is a cross-sectional view showing a state in which the preform is set. (B) is sectional drawing which shows the state which has provided the molded product shape to the preformed product. It is a figure for demonstrating the dimension example of a burring. FIGS. 8A and 8B are perspective views showing a locking portion region formed on a plate material, FIG. 8A is a view showing a plate material before press molding, and FIG. 8B is a plate material after press molding. FIG. FIGS. 9A to 9C are diagrams for explaining the arrangement of burring that can suitably prevent the breakage of the plate material. FIGS. 10A and 10B are diagrams for explaining an example of an arrangement form of burring. It is sectional drawing for demonstrating the press molding apparatus which concerns on the modification of 1st Embodiment. It is a figure for demonstrating the press molding method which concerns on the modification of 1st Embodiment, and is a partial cross section figure which shows the state which the punch evacuated from the board | plate material. It is a figure for demonstrating the press molding method which concerns on the modification of 1st Embodiment, and is a partial cross section figure which shows the state to which a press die | distance moves. It is a figure for demonstrating the press molding method which concerns on the modification of 1st Embodiment, and is a partial cross section figure which shows the state which formed the burring in the board | plate material. It is a figure for demonstrating the press molding method which concerns on the modification of 1st Embodiment, and is a partial cross section figure which shows the state which is press-molding a board | plate material. It is sectional drawing which simplifies and shows the press molding apparatus which concerns on 2nd Embodiment. FIGS. 17A and 17B are a plan view and a front view for explaining an example of the shape of the flange. 18A and 18B are a plan view and a front view for explaining an example of the shape of the flange. It is sectional drawing for demonstrating the press molding apparatus which concerns on the modification of 2nd Embodiment. FIGS. 20A to 20C are diagrams used to explain the results of studying the arrangement of burring. FIGS. 21A to 21C are diagrams used to explain the results of studying the arrangement of burring.

  Hereinafter, the present invention will be described based on each embodiment with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted. The dimensional ratios in the drawings are exaggerated for convenience of explanation, and may differ from actual ratios.

  In each embodiment, the press molding technique of the present invention is applied for the purpose of performing press molding on a plate material and molding a vehicle component having a predetermined product shape.

(First embodiment)
Referring to FIGS. 1A and 1B, a steel plate having a constant thickness is used as the plate material 10. The plate member 10 is stretched by press molding to form a thin portion 23 having a plate thickness smaller than the plate thickness of the base material. The plate material 10 formed with the thin-walled portion 23 is handled as a pre-formed product 20 in the previous stage to which the molded product shape is imparted.

  In the description in the specification, a portion where the plate thickness of the plate 10 before the thin molding is maintained, that is, a portion where the thickness of the base material is maintained before and after the thin molding is thickened. This will be referred to as part 21. A portion where the plate thickness is reduced as compared with the thick portion 21 is referred to as a thin portion 23.

  With reference to FIG. 2 and FIG. 3, the shape of the molded product is given to the preform 20. The preformed product 20 provided with the shape of the molded product forms a press-molded product 30 for constituting the product 40.

  The press-molded product 30 and the other article 35 are joined to complete an extension member as a product 40 that is a vehicle component (see FIG. 3).

  Next, the press molding apparatus according to the embodiment will be described.

  Referring to FIGS. 4 and 8, press forming apparatus 100 includes a first punch that can be locked to a plurality of first burrings (corresponding to first locking portions) 51 a to 51 c ( 71, which corresponds to the first hooking means, and a plurality of second punches (second ones) which can be locked to a plurality of second burrings (corresponding to first locking portions) 52a to 52c. 72) corresponding to the hooking means. A number of first punches 71 and second punches 72 corresponding to the number of burrings are provided.

  The press molding apparatus 100 is provided with first clamping means 73 for sandwiching the plate material 10 with the first punch 71 and second clamping means 74 for sandwiching the plate material 10 with the second punch 72. ing.

  The plate member 10 is previously provided with a pilot hole 11 for forming the first burrings 51a to 51c and the second burrings 52a to 52c (see also FIG. 5A). At the time of press molding, the pilot hole 11 is arranged at the tip portions of the first punch 71 and the second punch 72, and the plate material 10 can be positioned.

  The first punch 71 is provided so as to be movable toward and away from the first clamping means 73 (see also FIG. 5A). By moving the first punch 71 in the state in which the plate member 10 is set, it is possible to punch the pilot hole 11 to form the first burrings 51a to 51c having a cylindrical shape. After forming the first burrings 51 a to 51 c, the leading end of the first punch 71 is accommodated in the recess 75 of the first clamping means 73.

  The second punch 72 is provided so as to be movable toward and away from the second clamping means 74. By moving the second punch 72 closer to the second clamping means 74, the second burrings 52a to 52c can be formed.

  The first punch 71 and the first clamping means 73 and the second punch 72 and the second clamping means 74 are provided so as to be able to move away from each other in the left-right direction (arrow aa ′) in FIG. Yes. By separating the first punch 71 and the second punch 72 while being hooked on the plate member 10, the plate member 10 can be pulled and stretched in the surface direction.

  Next, burring according to the embodiment will be described.

  Since each burring can have the same shape, only the configuration of a part of the burring will be described.

  It is desirable that the first burring 51a has a shape capable of receiving a pulling force for pulling the plate member 10 and has a strength that does not cause damage due to the applied pulling force. From such a viewpoint, the shape and number of burrings can be designed as follows, for example.

  Referring to FIG. 7, the inner diameter φ of the first burring 51a is designed to be at least three times the thickness t of the plate material 10 before being thin-walled. By performing such a design, it is possible to effectively prevent the burring from being damaged due to the pulling force.

  The height dimension h of the first burring 51a is designed to be larger than the dimension t of the plate thickness of the plate member 10 before thin-wall molding. By performing such a design, it becomes possible to more reliably apply a pulling force necessary to stretch the plate 10 to the first burring 51a.

  The number x of burring can be obtained from the following equation, for example.

  As shown in FIG. 8, in the embodiment, three first burrings 51a to 51c are formed. The three first burrings 51a to 51c are combined to form a first locking portion region 51 (corresponding to one locking portion region). Further, three second burrings 52a to 52c are formed so as to be paired with the first burrings 51a to 51c. These three second burrings 52a to 52c are combined to form a second locking portion region 52 (corresponding to another locking portion region). By forming a plurality of burrings, it is possible to reduce the tensile force applied to each burring when the plate member 10 is pulled (see FIG. 8B), which can occur with thin-wall molding. It becomes possible to effectively prevent the burring from being damaged.

  Referring to FIGS. 9A to 9C, in the case of forming the first locking portion region 51 composed of a plurality of first burrings 51a to 51c, the first burrings 51a and 51b adjacent to each other. An arrangement form of burring that can suitably prevent breakage of the plate material 10 from the periphery of the plate will be described.

  In the example shown in FIG. 9A, the first burring 51a and the first burring 51b are arranged in a line in the width direction (vertical direction in the drawing) of the plate member 10.

  In thin-wall molding, when the plate member 10 is pulled and stretched in the longitudinal direction (left and right direction in the figure), the periphery of the first burring 51a and 51b is pulled toward the center position c of the plate member 10 (indicated by an arrow f in the drawing). . The plate member 10 is plastically deformed, and a constricted portion 13 is generated so as to be recessed toward the center position c of the plate member 10. Around the first burring 51a, 51b, a portion where the thinning has progressed significantly is formed. For this reason, there exists a possibility that the board | plate material 10 may generate | occur | produce from between the mutually adjacent 1st burring 51a and 1st burring 51b.

  In the example shown in FIG. 9B, the first burring 51a and the first burring 51b are arranged apart from each other in the pulling direction (left-right direction in the figure). Further, the first burring 51b positioned closer to the second locking portion region 52 than the first burring 51a (see FIG. 8) is formed in the direction intersecting the direction in which the plate 10 is pulled. It arrange | positions at the outer peripheral part 12a side.

  When the sheet material 10 is pulled and stretched during thin-wall molding, the base material flows toward the center position c of the sheet material 10 (indicated by an arrow f ′ in the figure). In this arrangement example, a portion where the thinning has progressed remarkably is formed around the first burrings 51a and 51b.

  In the example shown in FIG. 9C, the first burring 51a and the first burring 51b are arranged apart from each other in the pulling direction (left-right direction in the figure). Furthermore, the first burring 51b (see FIG. 8) positioned farther from the second locking portion region 52 than the first burring 51a (see FIG. 8) is formed in the direction intersecting the direction in which the plate 10 is pulled. It arrange | positions at the outer peripheral part 12a side.

  When such an arrangement is adopted, the flow of the base material (indicated by the arrow f ′ in the figure) generated around the first burring 51b can be suppressed by the first burring 51a. It is possible to prevent the formation of a portion where the thinning has progressed remarkably around the adjacent first burrings 51a and 51b. Therefore, it is possible to effectively prevent the plate material 10 from being broken.

  In the present embodiment, the first burring 51a and the first burring 51b are arranged so as to have the arrangement shown in FIG. 9C. Furthermore, as viewed from the first burring 51a, the first burring 51c is arranged at a position symmetrical to the position where the first burring 51b is formed in the width direction of the plate 10 (see also FIG. 8). This makes it possible to prevent the formation of a portion where the thinning has progressed remarkably between the adjacent first burring 51a and the first burring 51c. Further, the second burrings 52a to 52c arranged in pairs with the first burrings 51a to 51c in the longitudinal direction of the plate member 10 are also arranged so as to have an arrangement form as shown in FIG. Yes.

  With reference to FIG. 10 (A) and (B), the more preferable arrangement | positioning form of the adjacent 1st burring 51a and the 1st burring 51b is demonstrated.

  The inclination angle θ formed by the first burring 51a and the first burring 51b is desirably set within a range of about 30 ° to 45 °, for example. In the example shown in FIG. 10A, the inclination angle θ1 is set to 30 °. In the example shown in FIG. 10B, the inclination angle θ2 is set to 45 °.

  By disposing the tilt angle θ as described above, the stress applied to the first burring 51a is dispersed toward the first burring 51b located on the outer peripheral edge 12a side of the plate member 10. It becomes possible. Thereby, it can prevent effectively that thickness reduction progresses notably from the site | part located between the adjacent 1st burring 51a and 1st burring 51b.

  When the inclination angle θ is set to about 45 °, it is possible to further enhance the effect of dispersing the stress applied to the first burring 51a. For this reason, it is more preferable to set the inclination angle θ to about 45 °. Similarly, it is desirable that the inclination angle θ formed by the adjacent first burring 51a and the first burring 51c be arranged so as to satisfy the above-described conditions.

  Next, a press molding method according to the embodiment and a method for manufacturing a press molded product will be described.

  With reference to FIG. 5A, the plate material 10 is set in the press molding apparatus 100. The leading end portions of the first punch 71 and the second punch 72 are set in the pilot holes 11 provided in the plate member 10, and the portions to be punched are positioned.

  Referring to FIG. 5B, the first punch 71 is moved toward the first clamping means 73. The first burring 51 a is formed while sandwiching the periphery of the pilot hole 11 with the first clamping means 73. Similarly, a second burring 52a is formed by the second punch 72 (see also FIG. 1).

  The punch 71 is locked while forming the first burring 51a. The formation of the first burring 51a and the locking of the first punch 71 are performed simultaneously.

  Referring to FIG. 5C, the first punch 71 and the second punch 72 are moved apart (indicated by arrows aa ′ in FIG. 4). A tensile force is applied to the plate member 10 using the resistance in the pulling direction of the first burring 51a and the resistance in the pulling direction of the second burring 52a.

  As the plate member 10 is stretched, a thin portion 23 having a plate thickness smaller than the plate thickness of the base material is formed around the center position in the longitudinal direction of the plate member 10 (see FIGS. 1A and 1B). reference). Since the sheet material 10 is stretched in the surface direction and molded, the surface of the thin preform 20 can be formed into a smooth surface shape.

  With reference to FIGS. 6 (A) and 6 (B), a molded product shape is imparted to the preformed product 20 in which the thin portion 23 is formed.

  The preform 20 is set with the molding die 305 for imparting the shape of the molded product opened (see FIG. 6A). Press molding is performed by moving the upper mold 310 of the molding press mold 305 closer to the lower mold 320 (see FIG. 6B).

  With reference to FIG. 2, the press-molded product 30 to which the shape of the molded product is given is acquired. In the press-formed product 30, the first burrings 51a to 51c and the second burrings 52a to 52c are left. It is possible to partially increase the rigidity of the press-formed product 30 by leaving it to remain.

  By performing thin wall molding, the plate material 10 having a relatively small area is stretched. By stretching the plate member 10, it is possible to increase the area where the shape of the molded product can be imparted. For this reason, compared with the case where the press molded product formed by giving a molded product shape with respect to the board | plate material which has board | plate thickness comparable as a base material in the whole region can reduce a material cost.

  With reference to FIGS. 3A and 3B, a portion corresponding to the thick portion 21 of the press-formed product 30 is set in the welded portion 31, and welding with the other article 35 is performed. The extension member as a vehicle part is completed.

  Since the site | part which is not applied to the welding part 31 in the press molded product 30 is thinned, the weight reduction of the product 40 can be achieved. Since the site | part corresponded to the thick part 21 is set to the welding part 31, the rigidity of the welding part 31 in which stress tends to concentrate can be improved. Further, since the first burrings 51a to 51c and the second burrings 52a to 52c are left in the press-formed product 30, it is possible to obtain the product 40 with partially increased rigidity.

  As described above, according to the present embodiment, the first punch 71 and the second punch 72 that are hooked and locked to the first burring 51a and the second burring 52a, respectively, are moved relatively apart from each other, The sheet material 10 is stretched in the surface direction by using the resistance in the pulling direction of the first burring 51a and the second burring 52a to perform thin wall molding. For this reason, it is possible to form the surface into a smooth surface shape without attaching a bending wrinkle to the press-formed product 30, and to improve the molding quality of the press-formed product 30. Thereby, the product quality of the product 40 to which the press-formed product 30 is applied can be improved. Since the plate material 10 is supported by utilizing the resistance in the pulling direction of the first burring 51a and the second burring 52a, there is no need to separately install a clamping device for applying a restraining force in the thickness direction of the clamping device. An increase in the size of the press molding apparatus 100 accompanying installation can be suppressed.

A plurality of first burrings 51a to 51c form a first locking portion region 51, and a plurality of second burrings 52a to 52c form a second locking portion region 52.
Then, the first burring 51 a and the first burring 51 b forming the first locking portion region 51 are arranged apart from each other in the pulling direction, and are located far from the second locking portion region 52. The first burring 51b is disposed closer to the outer peripheral edge 12a of the plate member 10 in a direction crossing the direction in which the plate member 10 is pulled than the first burring 51a positioned closer to the second locking portion region 52. doing. For this reason, the flow of the base material generated from the periphery of the first burring 51b can be suppressed by the first burring 51a, and the breakage of the plate 10 can be effectively prevented.

  By using the resistance in the pulling direction of the burrings 51 a and 52 a formed in a cylindrical shape, a pulling force can be suitably applied to the plate material 10.

  Since the first burring 51a and the second burring 52a are left in the press-formed product 30, it is possible to obtain the press-formed product 30 with partially increased rigidity.

  Since the site | part which is not applied to the welding part 31 in the press molded product 30 is thinned, the weight reduction of the product 40 can be achieved. Since the site | part corresponded to the thick part 21 in the press molded product 30 is set to the welding part 31, the rigidity of the welding part 31 where stress tends to concentrate can be improved.

(Modification)
Next, a modification of the first embodiment will be described.

  Referring to FIG. 11, in this modification, a first punch 71 and a second punch 72 are installed in a pair of press dies 105 constituting the press molding apparatus 100. As the pair of press dies 105 move relatively close together, burring is formed, punches are locked, and the plate material is stretched. It differs from the first embodiment described above in that the above three operations are performed using the approach movement of the press die 105. The same members as those in the first embodiment described above are denoted by the same reference numerals, and a part of the description is omitted.

  The press die 105 includes a lower die 120 and an upper die 110 that can move toward and away from the lower die 120 relatively.

  The upper mold 110 is provided with a first punch 71 that can be locked to a first burring 51a formed on the plate 10 (see FIG. 14). Further, the second punch 72 is installed in correspondence with the second burring 52a formed at the target position with reference to the position where the first burring 51a is formed and the center line c 'shown in the figure. . As shown in the figure, the structure of the press die 105 has the same configuration on the left side and the right side of the center line c ′, so the configuration shown in the right half in the drawing will be described, and the configuration shown in the left half in the drawing will be described. Is omitted.

  The first punch 71 is integrally formed with the upper structure 111 connected to the upper mold 110. The upper structure 111 is attached to the upper mold 110 so as to be movable in the left-right direction in the figure. In order to regulate the amount of movement in the left-right direction, the upper die 110 is connected via the first urging member 112. The upper structure 111 is formed with a connecting hole 113 that can accommodate the protruding portion 127 formed on the first member 123 of the mounting portion 121 (see FIG. 14).

  A first clamping member 115 is installed adjacent to the first punch 71. The first clamping member 115 is urged toward the lower mold 120 using the second urging member 116. By moving the upper mold 110 closer to the lower mold 120, the plate member 10 can be sandwiched between the upper mold 110 and the first member 123 of the mounting portion 121 (see FIG. 13).

  The placement unit 121 on which the plate material 10 is placed includes a first member 123 on which the plate material 10 is placed, and a second member 124 that is positioned below the first member 123 and applied with an urging force toward the upper mold 110. It has.

  The first member 123 is attached to the second member 124 so as to be movable in the left-right direction in the drawing. In order to restrict the amount of movement in the left-right direction, the second member 124 is connected via a third urging member 125. The first member 123 is provided with a recess 126 that can accommodate the tip of the first punch 71 (see FIG. 13). Further, the first member 123 is provided with a protrusion 127 that is inserted into the connection hole 113 formed in the upper structure 111.

  The second member 124 of the mounting portion 121 is given a biasing force toward the upper mold 110 by the fourth biasing member 128. The urging force that the fourth urging member 128 applies to the second member 124 is set to be larger than the urging force that the second urging member 116 applies to the first clamping member 115.

  The press die 105 is provided with conversion means 130 for converting the approaching movement toward the lower die 120 of the upper die 110 into a sliding movement of the upper structure 111 and the first member 123 in the right direction in the drawing.

  The conversion means 130 includes a first cam 131 provided on the upper structure 111 of the upper mold 110 and a second cam 132 provided on the lower mold 120. When the upper mold 110 approaches a predetermined position, the inclined surface of the first cam 131 and the inclined surface of the second cam 132 come into contact with each other. When the upper mold 110 is further moved toward the lower mold 120 in this state, the upper structure 111 is moved together with the first punch 71 along with the movement of the first cam 131 along the inclined surface. Slides against the urging force applied (see FIG. 15). When the upper structure 111 slides, the first member 123 connected to the upper structure 111 through the connection hole 113 slides against the biasing force applied by the third biasing member 125 (see FIG. 15). . In this way, the approaching movement of the upper mold 110 to the lower mold 120 is converted into a sliding movement of the upper structure 111 and the first member 123. The upper structure 111 and the first member 123 located on the left side of the center line c ′ in the figure also slide in the left direction in the figure based on the same principle. Therefore, the plate member 10 is stretched by being pulled in the left-right direction in the drawing with the center line c ′ as a boundary.

  The press die 105 is provided with a second clamping member 140 that sandwiches the periphery of the center position of the plate material 10.

  The second clamping member 140 includes a first pressing pad 141 installed on the upper mold 110 and a second pressing pad 142 to which an urging force from the lower mold 120 toward the upper mold 110 is applied. The periphery of the center position, which is the starting point of stretching during thin-wall molding, is sandwiched by the second clamping member 140 (see FIG. 15). Thinning of the sandwiched portion can be suppressed, and the amount of thinness of the plate 10 can be adjusted.

  For example, a spring cushion can be used for each urging member.

  A press molding method according to this modification will be described.

  With reference to FIG. 12, the plate member 10 provided with the pilot holes 11 is placed on the first member 123 of the placement portion 121.

  The upper mold 110 is moved toward the lower mold 120.

  With reference to FIG. 13, the periphery of the pilot hole 11 of the plate member 10 is sandwiched between the first clamping member 115 and the first member 123 of the mounting portion 121.

  Referring to FIG. 14, the upper mold 110 is further moved toward the lower mold 120, and the lower hole 11 is punched by the first punch 71. A first burring 51 a is formed on the plate 10. The 1st punch 71 is made to latch with respect to the 1st burring 51a as it is.

  Referring to FIG. 15, upper mold 110 is further moved toward lower mold 120. The first punch 71 and the first member 123 of the mounting portion 121 are slid in the right direction in the drawing. At this time, the second punch 72 omitted in the drawing moves to the left in the drawing. The plate 10 starts to be stretched by the relative separation movement of the first punch 71 and the second punch 72.

  In order to advance the thin wall molding, the upper mold 110 is further moved toward the lower mold 120.

  The first punch 71 and the second punch 72 further move away from each other relatively, and the thinning proceeds.

  As described above, according to the press molding method according to this modification, the burring is formed on the plate material 10 and the punch is locked and the plate material is further stretched by one action of moving the pair of press dies 105 relatively close to each other. be able to. The work process required for press molding can be reduced, and the production efficiency can be improved. Moreover, since it becomes possible to perform thin wall molding by diverting an existing press die, it is possible to reduce the capital investment cost.

  The first embodiment described above can be modified as appropriate.

  The outer shape, number, and arrangement of the burring are not limited to those described in the embodiments, and can be changed as appropriate.

  Moreover, the latching | locking part should just be formed in the shape which can receive tension | tensile_strength at the time of the movement of a hooking means, and is not limited only to the form of burring.

(Second Embodiment)
Referring to FIG. 16, the press forming apparatus 100 according to the second embodiment includes a configuration capable of performing thin wall forming by engaging a hooking unit with a flange formed by bending a plate material 10. Yes. In this respect, it is different from the first embodiment in which the hooking means is locked with respect to the burring. The same members as those in the first embodiment are denoted by the same reference numerals, and a part of the description is omitted.

  Referring to FIG. 16, the first flange 61 (corresponding to the first locking portion) and the second flange 62 (corresponding to the second locking portion) are arranged on the outer peripheral edge portion 12 b of the plate member 10. The part to include is bent and formed. At the time of thin-wall molding, the plate material 10 provided with the first flange 61 and the second flange 62 in advance is prepared.

  The press molding apparatus 100 includes a first hooking unit 210 provided with a recess 251 that accommodates the first flange 61, a first clamping unit 230 that sandwiches the plate member 10 between the first hooking unit 210, and A second hooking means 220 provided with a recess 252 for accommodating the second flange 62 and a second clamping means 240 for sandwiching the plate material 10 between the second hooking means 220 are provided.

  The first hooking means 210 is provided so as to be movable toward and away from the first clamping means 230. At the time of thin-wall molding, the first hooking means 210 is locked to the first flange 61 by moving the first hooking means 210 closer to the first clamping means 230. Similarly, the second hooking means 220 is provided so as to be movable toward and away from the second clamping means 240. The second hooking means 220 can be locked to the second flange 62 by being moved closer.

  In the thin-wall molding, the first hook 61 is locked to the first flange 61, and the second hook 220 is locked to the second flange 62. -A ').

  According to the present embodiment, a tensile force is applied to the plate material 10 using the resistance in the pulling direction of the first flange 61 and the second flange 62, and the plate material 10 is stretched in the surface direction to perform thin-wall molding. Is possible. Therefore, as in the press molding method shown in the first embodiment, the molding quality of the press-molded product 30 can be improved, and consequently the product quality of the product 40 to which the press-molded product 30 is applied is improved. Can do. Since the plate material 10 is supported by utilizing the resistance in the pulling direction of the first flange 61 and the second flange 62, there is no need to separately install a clamp device that applies a restraining force in the plate thickness direction. An increase in the size of the press molding apparatus 100 accompanying installation can be suppressed.

  Next, the shape of the flange applied to 2nd Embodiment is illustrated.

  With reference to FIG. 17 (A), the 1st flange 61 and the 2nd flange 62 of the shape which bent the site | part containing the outer periphery 12b of the board | plate material 10 can be formed.

  Referring to FIG. 17B, the first flange 61 and the second flange 62 can be formed by bending the plate member 10 at two points such as the bending point 14a and the bending point 14b.

  With reference to FIG. 18 (A), uneven | corrugated shape can be provided to the vertical wall of the 1st flange 61 and the vertical wall of the 2nd flange 62. FIG. Since the hooking means can be locked to each of the concave portion 15a and the convex portion 15b, it is possible to have a configuration including a locking portion region formed by a plurality of locking portions in a pseudo manner. For example, the first hooking means 210 is engaged with the concave portion 15a and the convex portion 15b adjacent to the concave portion 15a to perform thin wall molding. This makes it possible to perform thin-wall molding by reproducing the arrangement of burring (see FIG. 9C) that can suitably prevent breakage of the plate 10 described in the first embodiment.

  Referring to FIG. 18B, the plate member 10 is bent at two points such as a bending point 14a and a bending point 14b, and the vertical wall of the first flange 61 and the vertical wall of the second flange 62 are uneven. It is possible to obtain a shape with a shape.

(Modification)
Next, a modification of the second embodiment will be described.

  Referring to FIG. 19, in this modified example, first hooking means 210 and second hooking means 220 are installed on a pair of press dies 105 constituting press molding apparatus 100. As the pair of press dies 105 move relative to each other, the flange is formed, the hooking means is locked, and the plate material is stretched. The second embodiment is different from the second embodiment described above in that the above three operations are performed using the approach movement of the press die 105. The same members as those in the second embodiment described above are denoted by the same reference numerals, and description thereof is partially omitted.

  The press die 105 includes a lower die 120 and an upper die 110 that can move toward and away from the lower die 120.

  The lower mold 120 is provided with a mounting portion 121 for setting the plate material 10. The upper mold 110 is provided with pressing means 260 for forming the first flange 61 and the second flange 62 on the plate 10 placed on the placement portion 121. As shown in the figure, the press mold 105 has the same configuration on the left side and the right side of the center line c ′, so the configuration shown in the right half in the drawing will be described, and the description of the configuration shown in the left half in the drawing will be omitted. To do.

  The pressing means 260 also functions as the first hooking means 210 that can be locked to the first flange 61. The pressing means 260 arranged in pairs on the left and right sides are attached so as to be slidable in the left-right direction in the figure so that they can move away from each other.

  The placement portion 121 is disposed on the support member 270 to which the urging force toward the upper mold 110 is applied by the spring cushion 128. The mounting parts 121 arranged in pairs on the left and right sides are attached so as to be slidable in the left-right direction in the figure so that they can move away from each other.

  The press die 105 is provided with conversion means 130 for converting the movement of the upper mold 110 toward the lower mold 120 into the slide movement of the pressing means 260 and the mounting portion 121.

  In thin-wall molding, the plate material 10 is set on the mounting portion 121. The upper mold 110 is moved toward the lower mold 120 with the plate member 10 set.

  The pressing means 260 provided on the upper mold 110 bends the plate material 10 to form the first flange 61. Simultaneously with the formation of the first flange 61, the pressing means 260 is hooked on the first flange 61 to be locked. In this state, the pressing means 260 arranged in pairs are moved apart in the left-right direction in the figure. Thin plate molding is performed by pulling the plate material 10.

  According to the press molding method according to this modification, the flange can be formed on the plate material 10 and the hooking means can be locked by one action of moving the pair of press dies 105 relatively close to each other, and the plate material is further stretched. be able to. The work process required for press molding can be reduced, and the production efficiency can be improved. The existing press mold can be diverted and thin wall molding can be performed, so that the capital investment cost can be reduced.

  The second embodiment described above can be modified as appropriate.

  The shape of the flange is not limited to the illustrated shape, and can be changed as appropriate. Moreover, the part to be bent is not particularly limited, and a flange can be formed by appropriately bending a part including at least the outer peripheral edge of the plate material.

  Next, the examination result of the arrangement form of the burring described in the first embodiment will be described.

  Thin burring was performed by arranging burrings in the three arrangement forms shown in FIGS.

  Referring to FIG. 20A, the first burrings 51a to 51c are arranged in a line in the width direction (vertical direction in the figure) of the plate member 10.

  Referring to FIG. 20B, the first burring 51a and the first burrings 51b and 51c adjacent to the first burring 51a are arranged apart from each other in the pulling direction (left-right direction in the figure), and the first burring 51a is arranged. The first burrings 51 b and 51 c positioned closer to the second locking portion region 52 than the second locking portion region 52 are arranged on the outer peripheral edge portion 12 a side of the plate material 10 in a direction crossing the direction in which the plate material 10 is pulled. Each of the first burrings 51a to 51c has a center position shifted by 10 mm from the center line as compared with the arrangement shown in FIG.

  Referring to FIG. 20C, the first burring 51a and the first burrings 51b and 51c adjacent to the first burring 51a are arranged apart from each other in the pulling direction (left-right direction in the figure), and from the first burring 51a Also, the first burrings 51 b and 51 c positioned far from the second locking portion region 52 are arranged on the outer peripheral edge 12 a side of the plate member 10 in a direction intersecting with the direction of pulling the plate member 10. Each of the first burrings 51a to 51c has a center position shifted by 10 mm from the center line as compared with the arrangement shown in FIG.

  The arrangement form shown in FIG. 20C is a preferable arrangement form of the burring described in the first embodiment (see also FIG. 9C).

  The examination results are shown in FIGS. In each figure, the portion indicated by a broken line is a portion where the thinning has remarkably progressed around the burring. That is, the portion where the breakage of the plate 10 is likely to occur is shown.

  Referring to FIG. 21 (A), it can be confirmed that a portion where the thinning has progressed remarkably occurs around the first burrings 51a to 51c. For this reason, the plate material 10 is easily broken from the periphery of the first burrings 51a to 51c.

  Referring to FIG. 21 (B), it can be confirmed that the first burrings 51a to 51c arranged close to each other are not formed so that the portions where the thinning has progressed significantly overlap. However, it can be confirmed that a portion where the thinning has progressed remarkably occurs around the first burring 51a, 51c located on the outer peripheral edge 12a side of the plate member 10.

  Referring to FIG. 21C, it can be confirmed that there is no portion where the thinning has progressed remarkably around the first burrings 51a to 51c. It can be confirmed that it is possible to effectively prevent breakage of the plate material 10 from the periphery of the burring by adopting the arrangement of the burring as shown in FIG.

10 Plate material,
11 Pilot hole,
12a outer periphery,
20 preformed products,
21 Thick part,
23 Thin part,
30 Press molded products,
31 welds,
40 products,
51 1st latching | locking part area | region (one latching | locking part area | region),
51a to 51c first burring (first locking portion),
52 second locking part region (other locking part region),
52a to 52c second burring (second locking portion),
61 1st flange (locking part),
62 second flange (locking portion),
71 1st punch (1st hook means),
72 second punch (second hooking means),
73 first clamping means,
74 second clamping means,
100 press molding equipment,
105 press mold,
110 Upper mold,
120 Lower mold,
130 conversion means,
210 first hooking means;
220 second hooking means;
230 first clamping means,
240 second clamping means,
260 Pressing means.

Claims (8)

In a state where the hooking means for hooking the locking portion is hooked on each of the at least two locking portions formed on a part of the plate material, each of the hooking means is moved relatively apart to pull the plate material, A press molding method for molding a thin portion having a thickness reduced from the thickness of a base material ,
The locking portion is a press molding method including a burring.   Each of the at least two locking portions is combined with another locking portion to form at least two locking portion regions, and at least two locking portions in one locking portion region are More than the latching part which is located away in the direction which pulls a board, and the latching part located far from the other latching part field is located near the other latching part field, The press molding method according to claim 1, wherein the press molding method is located on the outer peripheral edge side of the plate material in a direction intersecting with a direction in which the plate material is pulled. The hooking means are a plurality of hooking means corresponding to the number of locking portions provided on a pair of press molds that can be moved relatively close to and away from each other on both the front and back surfaces of the plate.
3. The press molding method according to claim 1, wherein the plate member is pulled while the locking portions are formed by the plurality of hooking means as the pair of press dies relatively move toward each other.   Manufacture of a press-molded product that obtains a press-molded product in which the shape of the molded product is further imparted to the preform molded by the press-molding method according to any one of claims 1 to 3 and the burring is left behind. Method.   A press-formed product manufactured by the method for manufacturing a press-formed product according to claim 4, wherein a welded part for welding a part thicker than the thickness of the thin-walled part to another article is provided. Press formed products.   Having first and second hooking means that can be hooked and engaged with each of the first and second locking portions formed on the plate,
  The plate member is provided with a pilot hole for forming a burring included in each of the first and second locking portions,
  Each of the first and second hooking means is a punch projecting toward the pilot hole,
  Punching the pilot hole with the punch to form the burring;
  A press forming apparatus for forming a thin portion having a plate thickness smaller than a plate thickness of a base material by moving the first and second hooking means relatively apart to pull the plate member.   Each of the first and second locking portions is combined with another locking portion to form two locking portion regions, and at least two locking portions in one locking portion region are The locking portion that is located in the direction of pulling the plate member and that is positioned far from the other locking portion region is more than the locking portion that is positioned closer to the other locking portion region. The press molding apparatus according to claim 6, wherein the press molding apparatus is located on the outer peripheral edge side of the plate material in a direction intersecting with a direction in which the plate material is pulled. A pair of press dies that are disposed on both front and back sides of the plate so as to sandwich the plate, and are relatively close to and away from each other, provided with the first and second hooking means;
The press molding apparatus according to claim 6 or 7, wherein the plate member is pulled while forming the first and second engaging portions in accordance with relative movement of the pair of press dies .

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