Assembled upper die

Abstract

To provide an assembly type top die capable of freely changing in shape.SOLUTION: An assembly type top die 10A comprises: a gooseneck piece 20 which is used for a press brake having a plurality of upper holders 3 mounted at proper intervals on the reverse side of an upper table 1, and is long enough in a right-left horizontal direction to straddle the plurality of upper holders 3; a plurality of extension pieces 30 which are fixed to the reverse side of the gooseneck piece 20 to be adjustable in position in the right-left horizontal direction; and a punch piece 50 which are fixed to the reverse sides of the extension pieces 30 to be adjustable in position in the right-left horizontal direction. The plurality of extension pieces 30 have a length L2 in the right-left horizontal direction which is a half as large as or less than a length L1 of the gooseneck piece 20, and two or more extension pieces can be mounted in parallel on the reverse side of the gooseneck piece 20.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an upper die for a press brake, and more particularly to an assembly-type upper die that can be easily changed in shape. [Background technology]

[0002] As a configuration for mounting an upper die to the bottom of an upper table in a press brake, for example, Patent Document 1 discloses a configuration in which a number of upper die holders (intermediate plates) of a predetermined height are mounted at appropriate intervals on the bottom of the upper table, and a long upper die or a split die divided into multiple pieces is supported by these multiple upper die holders.

[0003] Also, Patent Document 2 discloses an example in which an upper holder as shown in Patent Document 1 is divided into an upper intermediate plate and a lower intermediate plate, and the lower intermediate plate is attached to the upper intermediate plate so that its position can be adjusted in the left-right direction. According to the invention of Patent Document 2, by making the position of the lower intermediate plate adjustable, when a flange portion that has already been bent and raised on a plate material is in a position facing the upper holder, the position of the lower intermediate plate can be adjusted in the left-right direction to avoid facing the flange portion. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 58-320 [Patent Document 2] JP-A-5-305345 (Patent No. 2519010) Summary of the Invention [Problem to be solved by the invention]

[0005] The structure of a general upper table is shown in FIG. 10A, and FIG. 5 of Patent Document 2 is shown as FIG. 10B. In the figure, the reference sign "()" is the reference sign in the same document, and a brief explanation will be given with reference to this reference sign. A large number of upper holders (3) of a predetermined height are attached at appropriate intervals to the lower part of the upper table (1). In a press brake, a long upper mold (5) or a divided mold (5D) divided into a plurality of parts is supported by the large number of upper mold holders (3). The upper mold holder (3) of Patent Document 2 proposes using a general upper mold holder (3) in the center part of the upper table (1), and an upper mold holder (7) divided into two parts, upper and lower, instead of the general upper mold holder (3), at both ends. Referring to FIG. 10B, an upper mold holder (7) is attached to the existing pressing positions at both ends of the lower part of the upper table (1). The upper mold holder (7) is composed of an upper intermediate plate (13) and a lower intermediate plate (15) that are substantially Z-shaped. More specifically, the upper intermediate plate (13) is fixed to the lower part of the upper table (1) by a plurality of bolts (9) screwed into the upper table (1) and a lever member (11).

[0006] The lower intermediate plate (15) securely supports the split mold (5D) by means of bolts (17) and lever members (19). The lower intermediate plate (15) is supported so that its position can be adjusted in the left-right direction relative to the upper intermediate plate (13). That is, an engagement groove (15G) in the left-right direction is formed in the upper part of each lower intermediate plate (15). And, in order to secure each lower intermediate plate (15) to the lower part of the upper intermediate plate (13), a fastening lever member (23) is attached to the upper intermediate plate (13) by an appropriate number of bolts (21). A locking member (25) having a wedge-shaped cross section that can be engaged with and disengaged from the engagement groove (15G) is attached so as to be able to freely appear and disappear. The tightening lever member (23) has a width substantially equal to the width of the upper intermediate plate (13) in the left-right direction, and a groove (23G) is provided in the left-right direction where the tightening lever member (23) tightens the lower intermediate plate (15). The locking member (25) is engaged in the groove (23G) so as to be able to protrude and retract. A spring (27) is elastically mounted between the locking member (25) and a plurality of holes formed in the tightening lever member (23) to bias the locking member (25) in the direction of protruding from the groove (23G).

[0007] In this known example, the upper die holder is provided in a predetermined position corresponding to the existing pressing position under the upper table (1). The upper die holder (7) is separated into an upper intermediate plate 13 and a lower intermediate plate (15), so that within the range of the same upper die holder (7), the lower intermediate plate (15) can move left and right, but the range of movement is limited.

[0008] On the other hand, the upper die is only disclosed as a long upper die (5) or a split type (5D) of the upper die (5), and the only example shown is an upper die that is split horizontally (5). Therefore, even the invention of Patent Document 2 has limited means for avoiding interference with the flange of the workpiece that has been bent and raised.

[0009] The present invention does not aim to improve the upper die holder, but rather to improve the upper die itself and provide an assembly type upper die whose shape can be freely changed. [Means for solving the problem]

[0010] In order to achieve the above object, the assembly type upper mold of the present invention has a lower part of the assembly table, Has a lock to prevent it from falling off An assembly-type upper die for use in a press brake in which a plurality of upper holders are attached at appropriate intervals, the assembly-type upper die comprising: a gooseneck piece having a length in a left-right lateral direction spanning the plurality of upper die holders; a plurality of extension pieces fixed below the gooseneck piece so as to be positionally adjustable in the left-right lateral direction; and a punch piece fixed below the extension piece so as to be positionally adjustable in the left-right lateral direction, The extension pieces each have a lateral length that is equal to or less than half the length of the gooseneck piece, Each of the extension pieces has a piece body and a pressing plate fixed to the piece body by a tightening bolt, The gooseneck piece has an upper end provided with an engagement groove into which an anti-drop key of the upper holder is engaged, An engagement groove is provided in the lower end of the gooseneck piece and the lower end of the piece body in the left-right lateral direction, A fall-off prevention key that engages with the engagement groove is provided at the upper end of the piece body and the upper end of the punch piece so as to be capable of advancing and retreating while being biased toward the advancing side, Two or more extension pieces can be attached in parallel below the gooseneck piece. Effect of the Invention

[0011] The assembled upper die of the present invention is classified from top to bottom into a gooseneck piece, a plurality of extension pieces, and a punch piece. The gooseneck piece has a horizontal length spanning a plurality of upper die holders, and within that length, the extension piece can be attached to any location, or the punch piece can be attached directly without the extension piece, slid, and then tightened to fix. In other words, the punch piece can be attached to any location in the left-right direction, and can also be adjusted in the left-right direction. Therefore, the user can assemble any type of upper die.

[0012] Also, unlike the upper die holder, the assembled upper die cannot be configured to interfere with the workpiece at the point where the workpiece is sandwiched between the upper and lower dies. For example, in Patent Document 2, the split die (5D) held by the lower intermediate plate (15) cannot move in the left-right direction relative to the lower intermediate plate (15) once it is fixed to the lower intermediate plate (15). If the split die (5D) is to be moved in the left-right direction relative to the lower intermediate plate (15), an engagement groove (15G) must be provided on the split die (5D) side, and a locking member (25) protruding from the groove (23G) must be provided on the lever member (19) on the lower intermediate plate (15). However, this would increase the size of the lower side of the lever member (19). This is not a problem with the upper die holder because it is installed at a position away from the workpiece, but the upper die has a problem of interference with the bending process of the workpiece.

[0013] According to the assembly type upper die of the present invention, the structure around the anti-fall-out key on the punch piece side is provided above the tightening bolt, so that the pressing die of the punch body and the lower leg can be brought close to each other while avoiding interference with the workpiece. [Brief description of the drawings]

[0014] [Figure 1] FIG. 2 is a diagram showing an upper mold according to the present embodiment. [Diagram 2] FIG. 2 is a diagram showing an upper mold according to the present embodiment. [Diagram 3] FIG. [Figure 4] FIG. 2 is a cross-sectional view of an extension piece. [Diagram 5] 4A and 4B are diagrams showing details of a fall prevention key. [Figure 6] FIG. [Figure 7] FIG. 13 is a diagram showing another form of punch piece. [Figure 8] FIG. 2 shows a gooseneck piece. [Figure 9] FIG. [Figure 10] FIG. 1 illustrates a conventional press brake. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] A general upper table 1 is provided with a large number of upper die holders 3 of a predetermined height at appropriate intervals. In FIG. 1, the assembled upper dies 10A and 10B according to this embodiment are mounted across a large number of upper die holders 3 and are composed of a plurality of pieces. These pieces are classified from top to bottom into a gooseneck piece 20, a plurality of extension pieces 30, and a punch piece 50. The gooseneck piece 20 is a part that is held by the upper die holder 3 and has a curved portion so as not to interfere with the workpiece to be bent. This curved portion is a general one that is also seen in the split die (5D) shown in FIG. 10B. The gooseneck piece 20 is a long piece having a length L1 in the left and right lateral directions (LR directions in the figure) so as to span a plurality of upper die holders.

[0016] The multiple extension pieces 30 attached under the gooseneck piece 20 each have a lateral length L2 that is less than half the length L1 of the gooseneck piece, and two or more extension pieces 30 can be attached in parallel under the gooseneck piece 20. The extension pieces 30 can also be connected vertically. The punch piece attached under the extension piece 30 has a structure similar to that of the extension piece, but differs in that a pressing die for the work is formed at the lower end.

[0017] 1A and 1B show an example of an assembled upper die 10A in which a gooseneck piece 20, three extension pieces 30 on each side, and a punch piece 50 bridging the three extension pieces 30 are connected in order from the upper die holder 3 downward. FIG. 1A is a side view, and FIG. 1B is a front view. Also, FIG. 1C and 1D show an example of an upper die 10B in which a gooseneck piece 20, one extension piece 30 on each side, and a punch piece 50 bridging the two extension pieces 30 on each side are connected in order from the upper die holder 3 downward. FIG. 1C is a side view, and FIG. 1D is a front view. Referring to FIG. 1D, the bent workpiece W gradually becomes a square shape in side view, but the assembled upper die 10B is assembled in a gate-like shape, and can be finally bent into a square by entering between the left and right extension pieces 30.

[0018] When bending a workpiece W that is long in left-right length, the upper die can be constructed by widening the gap between the left and right extension pieces 30, and when bending a workpiece W that has a long side, the upper die can be constructed by connecting the left and right extension pieces 30 in multiple stages. Even if the bent workpiece W gets between the left and right extension pieces 30 as shown in Fig. 1C, the knockdown upper die 10B can be safely disassembled, and the workpiece W can be easily removed.

[0019] 2A and 2B show an example of an assembled upper die 10C in which, from the upper die holder 3 down, a gooseneck piece 20, three tiers of extension pieces 30 on the left, right and center, and two punch pieces 50 that bridge the three tiers of extension pieces 30 are connected. Although Figs. 1 and 2 show an example of one or three tiers of extension pieces 30, the number of tiers of extension pieces 30 can be set arbitrarily. The number of tiers of extension pieces 30 can be determined according to the length of one side of the workpiece W to be bent.

[0020] The extension piece 30 will be described with reference to FIG. 3. FIG. 3A is a side view of the extension piece 30, FIG. 3B is a front view (seen from the P1 direction in the figure), and FIG. 3C is a rear view (seen from the P2 direction in the figure). The extension piece 30 comprises a piece body 31 and a pressing plate 32. The piece body 31 has an upper end and a lower end that are """ (open bracket) and """ (close bracket), respectively, and has a shape in a side view in which the short sides are overlapped and connected, and a groove 31f is provided in the left-right direction at a position corresponding to the inside of """. An anti-dropout key 33 is engaged in the groove 31f so as to be able to appear and disappear. In this embodiment, a protruding height L3 protruding from the edge of the groove 31f is 2.5 mm. Meanwhile, an engagement groove 34 is provided in the left-right direction at a position corresponding to the inside of "". When the extension pieces 30 are connected vertically, the fall-prevention key 33 enters the engagement groove 34 of the extension piece 30 directly above. The fall-prevention key 33 is tapered on the upper side so that it can easily retreat into the groove 31f when an object enters between the inside of the """ and the pressing plate 32.

[0021] The piece body 31 and the pressing plate 32 are attached by a tightening bolt 35 having a threaded shaft below its head, and a stripper bolt 36 having a threaded shaft below its head via a cylindrical body.

[0022] The presser plate 32 will now be described. Fig. 3D is a front view (seen from the P1 direction in the figure), and Fig. 3E is a rear view (seen from the P2 direction in the figure). Accessories such as the tightening bolt 35, stripper bolt 36, and fall prevention key 33 have been removed. The presser plate 32 has legs 32a, 32b, each consisting of a single, slender protrusion, on the top and bottom, and the tightening bolt 35 and stripper bolt 36 are attached at positions halfway between the upper and lower legs 32a, 32b. The lower leg 32b abuts against the back side of the "" (end bracket) of the piece body 31 to which it is attached. The upper leg 32a sandwiches the other extension piece 30 or the gooseneck piece 20 to which the extension piece 30 is connected, between the inside of the "". The connection structure between the piece main body 31 and the pressing plate 32 will be described later with reference to Figure 4. There are numerous through holes 32c, 32d (through holes), and the functions of these holes will be explained with reference to Figure 4.

[0023] 3F is a front view of only piece body 31 as seen from the P1 direction. A large number of screw holes 31a, 31b, 31d and bottomed hole 31c are drilled, and the roles of these holes will be described with reference to FIG.

[0024] Figures 4A, 4B, and 4C show the state in which the tightening bolt 35 is tightened, and Figures 4D, 4E, and 4F show the state in which the tightening bolt 35 is loosened. Figure 4A is an x1-x1 cross section, Figure 4C is a y1-y1 cross section, Figure 4D is an x2-x2 cross section, and Figure 4F is a y2-y2 cross section. Figure 4G is an exploded view.

[0025] In the pressing plate 32, the counterbore 32e of the through hole 32d through which the stripper bolt 36 passes is adjusted to a depth such that when the screw shaft 36c of the stripper bolt 36 is screwed into the piece body 31 and the body 36b abuts against the piece body, the head 36a floats slightly above the bottom surface of the counterbore 32e. In this embodiment, the floating height L4 is set to 1 mm or less. The magnitude of this floating height L4 is smaller than the protruding height L3 (2.5 mm) of the fall-off prevention key.

[0026] The piece body 31 has a bottomed hole 31c on the side facing the pressing plate 32, and a spring 37 is housed in the hole. The spring 37 biases the piece body 31 and the pressing plate 32 so as to move them apart. The screw shaft of a tightening bolt 35, the screw shaft 36c of a stripper bolt 36, and the screw shaft of a tightening bolt 38 (described later) are screwed into the screw holes 31a, 31b, and 31d, respectively.

[0027] When the tightening bolt 35 is loosened, the pressing plate 32 is lifted from the piece body 31 by the spring 37, but the height to which it is lifted is limited by the stripper bolt 36. Therefore, the fall-prevention key 33 remains hooked in the engagement groove 34 (or engagement groove 24 described below) of the extension piece 30 (or gooseneck piece 20) directly above. On the other hand, the fall-prevention key 33 can move left and right along the engagement groove 34.

[0028] Next, the piece body 31 and the drop prevention key 33 will be described with reference to FIG. 5. FIG. 5A shows the state in which the drop prevention key 33 is pressed against the piece body 31, FIG. 5B shows the state in which the pressing is released, and FIG. 5C is an exploded view. When the drop prevention key 33 is pressed against the piece body 31, the entirety of the drop prevention key 33 is completely accommodated in the groove 31f. The piece body 31 and the drop prevention key 33 are fastened to the screw hole 33d of the drop prevention key 33 by the tightening bolt 38, and a collar 38a is inserted so that the head of the tightening bolt 38 is fastened at a certain distance from the drop prevention key 33. Therefore, the collar 38a and the tightening bolt 38 act like a stripper bolt. The drop prevention key 33 has a number of bottomed holes 33e on the side facing the piece body 31, and the springs 39 are accommodated in the holes. The springs 39 bias the piece body 31 and the drop prevention key 33 so that they move away from each other.

[0029] Fig. 6 shows the punch piece 50. Fig. 6A is a side view of the punch piece 50, Fig. 6B is a front view (as viewed from the P1 direction in the figure), and Fig. 6C is a rear view (as viewed from the P2 direction in the figure). The punch piece 50 comprises a punch body 51 and one or more (two in this embodiment) pressure plates 52. The pressure plate 52 has the same structure as the pressure plate 32 of the extension piece 30, so a description thereof will be omitted.

[0030] A groove 51f is provided at the upper end of the punch body 51 through the left-right direction. A drop-prevention key 53 is engaged in the groove 51f so as to be able to appear and disappear. The drop-prevention key 53 is either completely embedded in the groove 51f as in the extension piece 30, or protrudes 2.5 mm. The drop-prevention key 53 has a tapered upper side so as to easily enter the engagement groove 34 of the extension piece 30 connected directly above. The drop-prevention key 53 has a length that covers almost the entire length of the punch body 51 in the left-right direction. A press die 54 is provided at the lower end of the punch body 51.

[0031] The punch piece 50 shown in Fig. 6 has a length L2 in the left-right direction longer than the length L2 of the extension piece 30. Figs. 6E and 6F are front and rear views of the presser plate, and Fig. 6G is a view of the punch body 51 as seen from the direction P1. The mounting structure between the presser plate 52 and the punch body 51 is the same as the mounting structure between the presser plate 32 and the piece body 31, and the presser plate 52 has through holes 52c and 52d, and the punch body 51 has a bottomed hole 51c and screw holes 51a, 51b, and 51d. The screw shaft of the tightening bolt 55, the screw shaft of the stripper bolt 56, and the screw shaft of the tightening bolt 38 are screwed into the screw holes 51a, 51b, and 51d, respectively. Although not shown, a spring is housed in the bottomed hole 51c, which is the same as the extension piece 30. The tightening bolt 55 and the stripper bolt 56 are attached in the same manner as the tightening bolt 35 and the stripper bolt 36 already described for the extension piece 30. In other words, the punch piece 50 is the same as the extension piece 30 except for the portion of the pressing die 54 at the lower end, and has a form in which a plurality of extension pieces 30 are connected to the left and right.

[0032] Fig. 7A is a side view of the punch piece 60, and Figs. 7B and 7C are a front view and a rear view, respectively. The punch piece 60 shown in Fig. 7 is shorter in the left-right direction than the length L2 of the extension piece 30. The rest of the configuration is the same as that of the punch piece 50, but the bottomed hole 51c and the spring housed therein may be omitted. The tightening bolt 65 and the stripper bolt 66 are also exactly the same. By preparing punch pieces with various left-right lengths, they can be assembled into upper dies of various shapes.

[0033] FIG. 8 shows the gooseneck piece 20. FIG. 8A is a side view, FIG. 8B is a front view, and FIG. 8C is a cross-sectional view of an arbitrary portion. The gooseneck piece 20, like a general upper die, has a curved portion in the center to avoid interference with the work. The structure of the upper end of the gooseneck piece 20 depends on the existing upper die holder 3 attached to the upper table 1. Generally, the upper die holder 3 has a structure in which the upper die is clamped from the front and rear, but some upper die holders 3 are provided with a key to prevent the upper die from falling off. In this embodiment, an engagement groove 25 is provided in the gooseneck piece 20 so that the key to prevent the upper die holder from falling off can be fitted.

[0034] The structure of the lower end of the gooseneck piece 20 is the same as the structure inside the " " of the extension piece 30. The gooseneck piece 20 has a horizontal length spanning multiple upper die holders 3, and the extension piece 30 can be attached or the punch piece 50 can be directly attached and fixed anywhere within that length, so that the user can assemble any type of upper die. In addition, the gooseneck piece 20 has an engagement groove 24 over its length L1 in the horizontal direction, so that the extension piece 30 can be attached or the punch pieces 50, 60 can be directly attached and slid without the extension piece 30 anywhere within the length L1, so that the punch pieces 50, 60 can be attached or slid and fixed by tightening. In other words, the punch pieces 50, 60 can be attached at any position in the horizontal direction, and can also be adjusted in the horizontal direction.

[0035] FIG. 9 shows a state in which a workpiece W is bent using the example of the assembled upper die 10A of FIG. 1A in which three extension pieces 30 are connected below the gooseneck piece 20 and a punch piece 50 is attached.

[0036] Focusing on the punch piece 50, the legs 52a, 52b of the presser plate 52 sandwich the tightening bolt 55 from above and below, with the upper leg 52a abutting against the extension piece 30 directly above and the lower leg 52b abutting against the punch body 51. Therefore, the punch piece 50 is strongly connected to the extension piece 30 directly above by the principle of leverage. And, since the distance S between the position of the pressing die 54 of the punch body 51 and the lower leg 52b is short, the pressing die 54 is held stably.

[0037] In addition, in Patent Document 2, a locking member (25) is provided on a tightening lever member (23) attached to an upper intermediate plate (13). If the drop-out prevention key 53 of the punch piece 50 is provided on the presser plate 52 side, the structure of the area where the lower leg 52b of the presser plate 52 abuts against the punch body 51 becomes large (the area including the periphery of the groove 51f), and the tightening force cannot be concentrated. In addition, since the structure around the drop-out prevention key 53 is large, if the structure around the drop-out prevention key 53 is located below the tightening bolt 55, the position of the press die 54 of the punch body 51 and the position of the lower leg 52b must be separated in order to secure a space for bending the workpiece W without interference.

[0038] According to this embodiment, the structure around the fall-off prevention key 53 on the punch piece 50 side is provided above the tightening bolt 55, so that the pressing die 54 of the punch body 51 and the lower leg 52b can be brought close to each other. [Explanation of symbols]

[0039] 1 Upper table 3 Upper holder 10A, 10B, 10C upper type 20 Gooseneck Piece 24 Engagement groove 25 Engagement groove 30 Extension Piece 31 piece main body 31c Bottomed hole 31d Screw hole 31f groove 32 Retaining plate 32a, 32b Legs 32c, 32d through hole 32e Reeling 33 Anti-fall key 34 Engagement groove 35, 38, 55 Fastening bolts 36, 56 Stripper bolt 37, 39 Spring 38a Color 50, 60 punch pieces 51 Punch body 51a, 51b, 51d screw holes 51c Bottomed hole 51f Groove 52 Retaining plate 52a, 52b Legs 53 Anti-fall key 54 Press Mold

Claims

1. An assembly-type upper die for use in a press brake in which a plurality of upper holders each having an anti-drop-off key are attached at appropriate intervals to a lower portion of an upper table, the assembly-type upper die comprising a gooseneck piece having a length in the left-right lateral direction spanning the plurality of upper die holders, a plurality of extension pieces fixed below the gooseneck piece so as to be positionally adjustable in the left-right lateral direction, and a punch piece fixed below the extension piece so as to be positionally adjustable in the left-right lateral direction, The extension pieces each have a lateral length that is equal to or less than half the length of the gooseneck piece, Each of the extension pieces has a piece body and a pressing plate fixed to the piece body by a tightening bolt, The gooseneck piece has an upper end provided with an engagement groove into which an anti-drop key of the upper holder is engaged, An engagement groove is provided in the lower end of the gooseneck piece and the lower end of the piece body in the left-right lateral direction, A fall-off prevention key that engages with the engagement groove is provided at the upper end of the piece body and the upper end of the punch piece so as to be capable of advancing and retreating while being biased toward the advancing side, An assembly-type upper mold in which two or more extension pieces can be attached in parallel under the gooseneck piece.

2. In the assembly type upper die of claim 1, The assembly type upper die has a stripper bolt which penetrates the presser plate and is screwed into the piece body and has its head raised above the presser plate, and the raised height of the head is set to be smaller than the protruding height of the anti-fall-off key.

Images