JP2000061532A - Press formation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a press forming method capable of constituting a safe working content and moreover shortening the time required for the whole work even when different kinds of work are combined. SOLUTION: In a press forming method wherein rectangular parts to be formed are manufactured, pressing members 11, 11' which are respectively arranged in a bending place of a sheet metal set up in a state that a bending surface is vertically erected, bending members 12 adjacent to these, a bending station S1 which supports the pressing members and the bending members all together and which is provided with supporting blocks 6-9 movable in the longitudinal direction of the sheet metal material, and a caulking station S2 which caulks a joining end of a workpiece B' supported on the same pedestal as the bending station are provided. And the bending members are continuously advanced along the direction orthogonal to the bending surface with respect to a bending position in the sheet metal material in the vertically erected state, bent plural times to be formed into a rectangular shape, and then, end edges are mutually caulked at the caulking station.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press forming method, and more specifically, a sheet metal material is bent into a rectangular shape to crimp the edges of the workpiece to produce a closed rectangular workpiece. The present invention relates to a molding method for

[0002]

2. Description of the Related Art As is well known, a press molding method is one in which a punch and a die are used, and a sheet metal material to be molded is placed on the die and pressed by a press to perform bending and drawing. is there. By the way, as one of the shapes of the parts to be molded, there is a structure in which a rectangular shape as shown in FIG. 5 is formed, and the bent edges are crimped and closed as indicated by a symbol C in the drawing. As a procedure for performing such molding, for example, when only the bending process is described,
As shown in FIG. 6 (A), the sheet metal material is bent at two central portions in the longitudinal direction to form opposing pieces, and then,
As shown in FIG. 6 (B), the sheet metal material is bent at the end portion in the longitudinal direction to form other facing pieces, and the end portion of the piece that is bent later and the piece that is bent first. The edges may be crimped to form a rectangular shape. When performing such processing, in a general press molding apparatus, the sheet metal material is often placed on the die with the surface facing upward,
Due to the fact that the bending process is performed twice in this state, when the opposing pieces are formed by the previous bending, the punch is raised and the direction of the part to be molded in the semi-processed product state from above the die. It is necessary to change the above and perform the pressing process with the punch again. Also, after bending,
When the method of crimping the edges is used to join the bent pieces, for example, the burring portion formed on one of the edges is pressed into the crimp hole formed on the other of the edges. It is necessary to carry out so-called caulking by combining them.

[0003]

However, there are the following problems in processing the above-mentioned rectangular molded part. In other words, when bending the rectangular opposite pieces, when the previous bending is completed, the press work is interrupted to change the direction of the molded part in the semi-processed product state, and the worker takes out the molded part, Further, it is necessary to reset the taken-out molded part on the die again. Therefore, at least 2 is required to obtain a rectangular molded part.
Since the work content of the process is set, the work time increases due to an increase in the number of work steps.

When carrying out the above-mentioned two steps,
Since it is necessary for the operator to insert his / her hand between the press and the die to take out and insert the parts to be molded, it is necessary to be careful not to inadvertently lower the punch. Not only that, the work is troublesome because the work is taken out in a narrow space between the punch and the die.

When crimping is performed after bending,
Since the bending process and the caulking process are separate processes, it is necessary to prepare a dedicated device or tool, which may lead to an increase in equipment cost and an increase in processing procedure.

In view of the problems in the above-mentioned conventional press-molding method, particularly the molding method for producing a rectangular molded part, it is an object of the present invention to avoid danger even if an unexpected situation occurs for an operator. (EN) It is possible to provide a press molding method that can be used as a work content and that can shorten the time required for processing by making it possible to consistently perform molding at the same place without increasing equipment costs. .

[0007]

In order to achieve this object, the invention according to claim 1 is a press-molding method for manufacturing a rectangular molded part by bending a plurality of times, and the bending surface is vertical. The pressing member and the bending member adjacent thereto, which are respectively arranged at the bending portions of the sheet metal material installed in a standing state, and collectively support the pressing member and the bending member, in the longitudinal direction of the sheet metal material. A bending station having a movable support block, a burring portion formed on a joint end of a work piece supported on the same base as the bending station and bent into a rectangular shape at the bending station, and A crimping station that presses the caulking holes facing each other for crimping is provided, and the crimping station stands upright at the bending station. With respect to the bending position in the sheet metal material, the bending member is continuously advanced along a direction perpendicular to the bending surface to bend a plurality of bending positions substantially at the same time to form opposing pieces and form a rectangular shape. Then, the edges of the rectangular workpieces are swaged at the swaging station.

According to a second aspect of the present invention, in the press forming method according to the first aspect, both ends of the sheet metal material in the longitudinal direction are bent first, and then the center side in the longitudinal direction is bent to finish into a rectangular shape. It is characterized by being.

According to a third aspect of the present invention, in the press molding method according to the first aspect, the bending surface is bent toward the front side by the pressing member.

According to a fourth aspect of the present invention, in the press-molding method according to the first aspect, the bending station and the crimping station are provided at positions adjacent to each other and driven by the same driving source, and are removed from the bending station. The feature is that the product is transferred to the caulking station and caulked.

[0011]

According to the first and fourth aspects of the present invention, the bending member is in a direction perpendicular to the bending surface with respect to the bending position of the sheet metal material with the bending surface standing upright, in other words,
Bending is performed by moving in the horizontal direction, and by performing the bending operation continuously, another pair of facing pieces is formed as it is without changing the orientation of the semi-processed product on which the pair of facing pieces is formed. It can be made into a rectangular shape. Therefore, the operator only needs to position the sheet metal material once, and does not need to take out the semi-finished product and reset it. Moreover, since the caulking process can be performed at the caulking stations that are installed next to each other on the same base as the bending station, it is possible to set a new sheet metal material in the bending station without performing caulking work by another device. The caulking work of the workpiece transferred from the folding station can be performed continuously and continuously on the same base.

According to the second and third aspects of the invention, the bending direction of the sheet metal material is a horizontal direction perpendicular to the bending surface, and further, the pair of opposite end portions are formed by bending both ends in the longitudinal direction, and further, Since the rectangular shape can be obtained by continuously bending the central portion in the longitudinal direction to form this piece, the rectangular shaped product is a vertically movable punch used in conventional press molding. It is not taken out by inserting a hand between the die and the die, but taken out before the position between the bending member and the pressing member.

[0013]

The present invention will be described in detail below with reference to the illustrated embodiments. FIG. 1 is an external view of a press molding machine used in a press molding method according to an embodiment of the present invention, in which the press molding apparatus 1 is mounted on the upper surface of a frame carriage 2 and is integrally supported. The frame carriage 2 can be moved to a desired place by rolling the casters 2A included in the legs, which is provided with the base 4 having the pair of side plates 3.

A drive motor 5 is provided on one side plate 3 on the upper surface of the base 4, and both ends of an output shaft 5A of the drive motor 5 are rotatably supported by the side plate 3. In this embodiment, the drive motor 5 has a structure in which the drive motor 5 makes one rotation after the foot switch indicated by the symbol FT is operated and then stops. The output shaft 5A of the drive motor 5 is composed of a spline shaft. The output shaft 5A has a plurality of supporting blocks 6 and 7, which support a pressing member and a bending member, which will be described later, collectively. A supporting block 30 for caulking that supports the members 8 and 9 and the caulking process is slidably supported along the axial direction.

The supporting blocks 6 to 9 are bending stations (for convenience, reference numeral S1 is used for bending the sheet metal material.
In the case of the present embodiment, the number of bent portions is four in correspondence with the shape of the molded part being rectangular. Caulking support block 30
Is located adjacent to the bending station A and constitutes a caulking station (for convenience, indicated by reference numeral S2) for caulking a processed product which has been bent.

The support blocks 6 to 9 have an internal structure shown in FIG. FIG. 2 is a schematic diagram in plan view for explaining the principle structure inside the support block,
The casing 10 that forms the case, and the pressing member 11 that is disposed on the front end side of the casing 10 that corresponds to the side indicated by the symbol F
And a bending member 12 that can move forward and backward toward the tip side of the housing 10. A guide shaft 13 extending between the side plates 3 is inserted into the housing portion 10 and can move along the axial direction of the guide shaft 13. The guide shaft 13 has a scale on its peripheral surface, which is not shown. Is marked so that each support block can be positioned. Therefore, the housing unit 1
A positioning member 10A for holding the position of the guide shaft 13 by tightening is integrated with 0.
The pressing member 11 located on the front end side of the housing 10 is arranged with a gap between itself and the front end surface of the housing 10 so that a sheet metal material to be molded can be inserted.
The configuration is different between the support blocks 6 and 9 located at both ends in the axial direction and the support blocks 7 and 8 located at the center side in the axial direction. That is, in the support blocks 6 and 9 located at both ends in the axial direction, the pressing member 11 that can be moved up and down in FIGS. 1 and 2 is supported by the support portion 10D that is integrated with the tip side of the housing portion 10. In the support blocks 7 and 8 located on the central side in the axial direction, a pressing member (indicated by reference numeral 11 ′ for convenience) is integrated with the tip of the housing 10 (for convenience, reference numeral 10D ′). (Shown by) is fixed by a predetermined protruding height. The predetermined protruding height in this case corresponds to the height corresponding to the width of the bent surface of the molded part.

The pressing members 11 provided on the support blocks 6 and 9 located at both ends in the axial direction are normally given a descending habit by an elastic member (not shown), and the descending position due to the habit is a push-up member 14 to be described later. Stipulated by That is, the push-up member 14 is in contact with the swing end of the swing lever 16 fixed to the swing shaft 15, as shown in FIG. The swing shaft 15 is integrated with the base end of a driven lever 18 that is swing-driven by a cylinder 17 attached to one of the side plates 3.
In response to the forward / backward movement of 7, the swing lever 16 is swung to raise / lower the push-up member 14. When the push-up member 14 is pushed up by the swing lever 16 swinging, the pushing member 11 has the same projecting height as the pushing member 11 ′ of the support blocks 7 and 8 located on the axial center side of the guide shaft 13. Is set to.

In the inside of the support blocks 6 to 9 in FIG. 2, a sheet metal material (reference numeral B in FIG. 2) inserted into the gap by advancing a part of the casing portion 10 toward the pressing members 11 and 11 '.
A member) is provided in cooperation with the pressing members 11 and 11 'to sandwich the member. That is, in FIG. 2, the spring 10B is arranged inside the support blocks 6 to 9, and one end of the spring 10B is provided with the pressing members 11 and 1.
The material pressing member 10C which is provided so as to be able to move forward and backward with respect to 1 '
Is always given to the pressing members 11 and 11 '. The material pressing member 10C is a spring 10B.
The movement habit due to is defined by a cam 19B for driving the material pressing which is provided in the cam means 19 described later.

As shown in FIGS. 1 and 2, the bending member 12 is arranged such that the tip end portion thereof can move forward and backward with respect to the side surface of the pressing member 11 at a position where the tip end side is adjacent to the pressing member 11. The driving for driving is performed by the cam means 19 described later. The cam means 19 is provided with a pair of cams 19A and 19B provided on the rear end side of the bending member 12 and fixed to the output shaft 5A of the drive motor 5, and each of these 19A and 19B protrudes from the bending member 12. (19A) and driving material pressing member (19B)
Is provided as. The ejecting cam 19A is for advancing the bending member 12 toward the pressing member 11 side, and the material pressing member driving cam 19B cooperates with the pressing members 11 and 11 'to sandwich the sheet metal material. It is for doing. The cams 19A and 19B of the cam means 19 are in contact with the cam followers 20 and 21 on the bending member 12 and the material pressing member 10C, respectively, and the bending member 12 is bent.
The forward / backward drive and the pressing of the sheet metal material toward the pressing members 11 and 11 'are performed. Therefore, regarding the cam profile, the protruding cam 19A is
The shape of the sheet metal material pressed by the pressing member 11 can be kept in the bent state for the time required to eliminate the spring back when the molded part is bent, and the cam 19B for driving the material is driven by the bending member 12. Press the material pressing member 10C before the start of advancement 1
The shape is such that it can be moved toward 1, 11 '. The ejecting cam 19A has a maximum diameter part that allows the bending member 12 to protrude along the side surfaces of the pressing members 11 and 11 ', and the material pressing drive cam 19B has the behavior of the spring 10B. It has a maximum diameter part that can separate the material extruding member 10C from the pressing members 11 and 11 'against.

The cam means 19 provided on the support blocks 6 to 9 have different cam profile phases for the following reasons. In the present embodiment, as shown in FIG. 3, the support blocks 6 located at both axial ends of the guide shaft 13,
The order in which the bending process is performed in the support blocks 7 and 8 located on the axial center side of the guide shaft 13 after the bending process in 9 is performed is set. Therefore, the cam means 19 provided in the support blocks 7 and 8 located on the axial center side of the guide shaft 13 is bent at the time when the bending processing of the support blocks 6 and 9 on both axial ends of the guide shaft 13 is completed. The phase of the cam profile, in other words, the protrusion start time of the bending member 12 is shifted so that the member 12 can be advanced or retracted, that is, protrusion can be started to eliminate springback and then retract.

On the other hand, in FIG. 1, the support blocks 6 and 9 are
The push-up timing of the push-up member 14 included in the above is determined as follows. The push-up member 14 has a function of pushing up the pressing member 11 to press the sheet metal material in order to prevent the sheet metal material from being dragged by the shearing force of the bending member 12 during bending. For this reason, the pressing member 11 is pushed up while the bending process is performed on the support blocks 6 and 9, and the support blocks 6 and 9 are pushed up.
When the bending process is completed, it descends and the bending member 1
The state of being adjacent to the tip of No. 2 is released. The cylinder 17, which is the drive unit of the push-up member 14,
The swing shaft 15 is controlled to swing in accordance with the above-described push-up timing of the push-up member 14.

In FIG. 1, reference numeral 22 is a member for positioning one end in the longitudinal direction of a sheet metal member (a member indicated by reference symbol B in FIG. 2) to be a molded part, and one end in the longitudinal direction of the sheet metal member. By abutting, the bending position by the bending member 12 included in the support blocks 6 to 9 is positioned.

As shown in FIG. 1, the caulking support block 30 is adjacent to the outermost one of the support blocks 6 to 9 and is adjacent to the support block 9 in the same manner as the respective support blocks 6 to 9, as shown in FIG. It is arranged on the base 4. The caulking support block 30 is provided with a caulking cam 30A attached to the output shaft 5A of the drive motor 5 that is a drive source in each supporting block, and a cam follower 30B with which the outer peripheral surface of the cam 30A abuts inside. Caulking member 3 capable of advancing and retracting in the same direction as bending member 12 of block 9
0C and a support base formed to extend from a part of the base 4 facing the caulking member 30C (for convenience, reference numeral 4A ′
(Shown by), and the caulking receiving member 31 fixed on the upper part. The caulking member 30C is a member for caulking by pressing a burring portion formed on one of the edges of the bent processed product to a caulking hole formed on the other of the edges so as to face the burring portion. In addition, a pressing surface 30C1 formed of a flat surface for pressing and fitting the burring portion to crush the burring portion is provided at a portion facing the caulking receiving member 31.

The caulking cam 30A provided on the caulking support block 30 operates a foot switch FT as shown in FIG. 3 with respect to the processing timing at the folding station S1 shown in FIGS. The operation timing is set such that the operation proceeds at the time when the bending member 12 is moved, and the bending member 12 moves backward as the bending member 12 moves backward. As a result, the processed product that has been subjected to the bending process is transferred to the caulking station S2, and then the caulking process can be performed at the same time as the next sheet metal material is set in the bending station S1 and the bending process is performed.

Since the present embodiment is constructed as described above,
Before the foot switch FT is operated, of the pressing members 11, 11 included in the support blocks 6 to 9, the pressing member 11 included in the support blocks 6 and 9 is positioned in the lowered position, and the bending member 12 is included in the retracted position. Be positioned at.
On the other hand, the sheet metal member B (see FIG. 2) is set such that the bending surface is vertically erected, and the bending position with respect to the sheet metal member B is set along the guide shaft 13 along the support blocks 6 to 9. It can be positioned by moving it. Since the positioned support blocks 6 to 9 are maintained in an immovable state by tightening the positioning member 10A with respect to the guide shaft 13, their positions do not shift. Of the support blocks 6 to 9, the guide shaft 13
The pressing member 11 'provided on the support blocks 7 and 8 located on the axially central portion side of the support block 10A' from the beginning.
Since it is fixed and set to a predetermined protrusion height above, and is provided with a gap between the tip surface of the support block 10 and the sheet metal material to be inserted, as shown in FIG. The bending position by the support blocks 6 to 9 is determined by inserting the sheet metal member B into the gap and abutting one end of the sheet metal member B in the longitudinal direction against the positioning member 22.

When the foot switch FT is operated, FIG.
In the timing chart shown in, first, the guide shaft 1
The pressing members 11 of the support blocks 6 and 9 located at both axial ends of the drive member 3 are driven and protrude. That is, in this case, the cylinder 17 is driven to extend the rod, and the swing lever 16 swings in the direction to push up the push-up member 14 through the swing of the driven lever 18, and this state is caused by the bending member 12. It is maintained until the folding process is completed.
When the pressing member 11 is pushed up, the drive motor 5 starts to rotate and the cam means 19 rotates, so that the cams 19A and 19B rotate. When the cams 19A and 19B rotate, the material pressing member 10C corresponding to the cam 19B
Moves toward the pressing member 11 side and holds the sheet metal material B together with the pressing member 11. Next, the bending member 12 corresponding to the cam 19A moves forward and protrudes along the side surface of the pressing member 11 to perform bending processing on the outer side portion of the sheet metal material B, which is a plan view of the processing state (FIG. 4). A)
As shown in FIG. 5, a semi-processed product (hereinafter referred to as a processed product B ′) is formed by bending the front side and forming opposing pieces. At this time, if the caulking member 30C advances toward the caulking receiving member 31 at the caulking station S2 and the processed product B ′ (see FIG. 4 (B)) of the above-mentioned form is transferred, the processed product B ′. The caulking process is performed on.

In FIG. 3, when the bending process using the support blocks 6 and 9 on both axial ends of the guide shaft 13 corresponding to the outer side of the sheet metal material B is completed, a processed product B'is obtained (FIG. 4 (A)), the bending members 12 of the support blocks 6 and 9 retract and the push-up members 14 descend. In this case, the bending member 12 retracts in accordance with the cam profile of the cam 19A, and the rod is contracted by the drive of the cylinder 17, whereby the swing lever 16 returns to the original state and swings to push the push-up member 14. To descend.

As shown in FIG. 4 (B), the guide shaft 1 corresponding to the central portion of the processed product B'corresponds to the end of the bending process by the support blocks 6 and 9 in FIG.
Bending by the support blocks 7 and 8 on the axial center side of 3 is started. That is, in this case, unlike the operation of the support blocks 6 and 9 described above, the pressing member 11 ′ is
Is fixed to the support blocks 7 and 8, the lifting operation of the pressing member 11 'is not performed. As the cams 19A and 19B of the support blocks 7 and 8 rotate, the material pressing member 10C moves toward the pressing member 11 ′ to clamp the processed product B ′, while the bending member 12 presses the pressing member 11 ′. By projecting along the side surface of the product, the central part of the processed product B ′ is bent, and as shown in FIG. 4 (B),
The remaining opposing pieces are formed and finished into a rectangular shape. At this time, in the caulking station S2, the caulking member 30C is retracted in accordance with the receding of the bending member 12, so that the caulking process of the processed product B'is completed and the next processed product B'is targeted. It becomes possible to prepare for caulking.

According to the above embodiment, as shown in FIG. 5, the bending direction of the processed product B'formed from the sheet metal material B is set to the front of the press molding apparatus 1, so that after the molding, Since the processed product B ′ is in a state of projecting to the front side of the press molding apparatus 1, as shown in FIG. 5B, the region where the worker can grip when taking out the processed product B ′ faces the worker. Can be secured on the side, and the operator's hand is supported by the support blocks 6 to 9
It is possible to take out the processed product B ′ without inserting it into the place where is located. Furthermore, according to the present embodiment, the operation of the bending member can be a simple operation of advancing and retreating, unlike complicated operation such as rotation or rocking, as compared with folding forming and end folding processing, so that the drive structure Can be simple. Further, when the rectangular bent processed product B ′ is transferred to the crimping station S2, the bending work at the folding station S1 is re-meeted at the same time, so that the bending work and the crimping work are performed. It can be done at about the same time.
The crimping timing at the crimping station S2 is not limited to that in the above-described embodiment, and the point is that the timing for performing the crimping can be performed simultaneously with the bending.

[0030]

As is apparent from the above embodiments, according to the first and fourth aspects of the present invention, the bending member is perpendicular to the bending surface at the bending position of the sheet metal material with the bending surface standing vertically. In this way, in other words, the bending is performed by moving it in the horizontal direction, and by performing the bending operation continuously, the semi-processed product on which the pair of opposed pieces is formed is not changed in the other direction as it is. The pair of opposing pieces can be formed into a rectangular shape. Therefore, the operator only needs to position the sheet metal material once, and does not need to take out the semi-finished product and reset it. Moreover, since the caulking process can be performed at the caulking stations that are installed next to each other on the same base as the bending station, it is possible to set a new sheet metal material in the bending station without performing caulking work by another device. The caulking work of the workpieces transferred from the folding station can be continuously performed on the same base. As a result, it is possible to omit the two-step processing by taking out or resetting the semi-finished product, that is, the step of changing the direction of the semi-finished product, and the separate steps of bending and caulking. Since they can be executed at the same place, it is possible to reduce the work time by shortening the work time and omitting dangerous work contents.

According to the second and third aspects of the invention, the bending direction of the sheet metal material is a horizontal direction perpendicular to the bending surface, and further, the pair of opposite end portions are formed by bending both ends in the longitudinal direction. Further, since the rectangular shape can be obtained by continuously bending the central portion in the longitudinal direction to form this piece, the rectangular shaped product can be moved vertically as used in conventional press molding. It is not taken out by inserting a hand between the punch and the die, but taken out before the position sandwiched by the bending member and the pressing member. As a result, unlike the conventional molding, a hand is not inserted between the punch, which is the movable part, and the die, so that it is possible to ensure the safety of the work.

[Brief description of drawings]

FIG. 1 is an external view of a press molding machine used in a press molding method according to an embodiment of the present invention.

FIG. 2 is a schematic view showing a partial cross section for explaining the internal structure of the press molding machine shown in FIG.

FIG. 3 is a timing chart for explaining the procedure of the press molding method according to the embodiment of the present invention.

4A and 4B are views for explaining a working process by the press molding apparatus shown in FIG. 1, in which FIG. 4A shows a forming process of one of the facing pieces of the sheet metal material, and FIG. The process of forming the facing piece is shown.

FIG. 5 is a perspective view showing an example of a rectangular molded part.

FIG. 6 is a diagram for explaining a molding process of the molded part shown in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Press molding apparatus 5 Drive motors 6-9 Support blocks 11 and 11 'located at a bending station Pressing member 12 Bending member 14 Push-up member 19 Cam means 19A, 19B Cam 30 Caulking support block 30A located at a caulking station Caulking cam 30B Cam follower 30C Caulking member S1 Bending station S2 Caulking station B Sheet metal material for molded products B'Processed product C Caulking section

Claims (4)

[Claims] 1. A press forming method for producing a rectangular shaped part by bending a plurality of times, each of which is arranged at a bending portion of a sheet metal material installed with the bending surface standing vertically. A bending station having a pressing member and a bending member adjacent to the pressing member, a supporting block that collectively supports the pressing member and the bending member, and is movable in the longitudinal direction of the sheet metal material, and the same bending station as the bending station. A crimping station for crimping is provided by pressing a burring portion formed on a joint end of a processed product which is supported on a table and bent in a rectangular shape at the folding station and a caulking hole opposite to the burring portion. The bending member with respect to the bending position in the sheet metal material in a state of standing vertically at the bending station By continuously advancing along a direction perpendicular to the bending surface to bend a plurality of bending positions substantially at the same time to form opposing pieces and form a rectangular shape, and then form a rectangular shape at the caulking station. A press molding method, characterized in that the edges of the product are caulked. 2. The press forming method according to claim 1, wherein the sheet metal material is bent at both longitudinal end sides first, and then at the longitudinal center side to be finished into a rectangular shape. Molding method. 3. The press molding method according to claim 1, wherein the bending surface is bent forward by the pressing member. 4. The press molding method according to claim 1, wherein the bending station and the crimping station are provided at positions adjacent to each other and driven by the same driving source, and the workpiece removed from the folding station is transferred to the crimping station. A press-molding method, characterized by carrying out caulking instead.