Indentation-free bending lower die with adjustable opening

Abstract

The utility model discloses a non-indentation bending lower die with an adjustable opening, which relates to the technical field of bending dies and comprises a lower die holder, a servo motor is mounted on one side of the outer surface of the lower die holder, the output end of the servo motor is connected with a bidirectional lead screw, and two nut seats are sleeved outside the bidirectional lead screw. According to the utility model, the servo motor, the bidirectional screw rod, the nut seat, the gasket and the hook groove are arranged; after the first split lower die and the second split lower die are opened, a worker starts a servo motor, after the servo motor is started, the output end drives a bidirectional lead screw to rotate, after the bidirectional lead screw rotates, two nut bases are made to be close to each other through guiding of a sliding rail, and when the two nut bases are close to each other, an ejector block is pushed to move on a push frame due to the shapes of the nut bases; after the ejector block moves, one side of the top of the ejector block enters a clamping groove of a plurality of gaskets, and then the servo motor is closed; and the plugging quantity of the gaskets is conveniently and automatically controlled, so that the opening size of the lower die is conveniently and automatically adjusted.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of bending mould, concretely is an opening adjustable no indentation bending lower mould. BACKGROUND

[0002] The main components of the bending machine are a hydraulic system, an upper die and a lower die, the lower die mainly has a single V, a double V and a multi-V lower die, and the lower die is mainly selected according to different plate thicknesses to select a lower die with different groove widths, but with the development of the bending machine, the bending lower die can now be adjusted by a gasket to control the opening size and thus the width of the V groove.

[0003] The utility model discloses a kind of adjustable lower die devices for special-shaped plate bending, including die holder, the inside of die holder is equipped with slot, both sides in the inside of slot are equipped with a group of adjusting plate one, the opposite side of two groups of adjusting plate one is connected with no indentation inlay strip, and no indentation inlay strip is equipped with threaded hole, the both sides of die holder are fixedly installed with gasket, and two gaskets are equipped with a group of adjusting plate two, the both sides of die holder are equipped with through-hole, and die holder is further connected with connecting screw, connecting screw is sequentially passed through corresponding a group of adjusting plate two, through-hole and adjusting plate one and is connected with no indentation inlay strip by threaded hole by screwing thread.The utility model can adjust the opening of lower die by the design of adjusting plate one and adjusting plate two, adjust the spacing between two no indentation inlay strips, can complete the bending of workpiece of different thickness, no interference is caused to special-shaped bending piece by the design of no indentation inlay strip, and it is more versatile, and it is convenient to use, and low in cost.

[0004] The opening of prior art is mostly as shown in the above technical solution, mainly by manually placing gasket, then by tightening bolt limiting, so that operation is more cumbersome and not convenient for quick adjustment, resulting in more time is spent when replacing product batch. UTILITY MODEL CONTENTS

[0005] Based on this, the utility model aims to provide an opening adjustable no indentation bending lower mould to solve the technical problems mentioned in the above background art.

[0006] To achieve the above object, the utility model provides following technical scheme: an opening adjustable no -indentation bending lower mould, including lower mould base, the lower mould base outer surface one side is installed with servo motor, and servo motor output end is connected with two -way screw rod, the two -way screw rod outside is equipped with two nut bases, the lower mould base top side is provided with second cylinder, guide frame and slide rail respectively, and the second cylinder output end is connected with two top blocks through the push frame, the two top block bottom side all are equipped with first guide groove, the lower mould base inside is connected with a plurality of gaskets, and a plurality of gaskets bottom all are equipped with two second guide grooves and a hook groove, the lower mould base outer surface runs through two supporting rods, the lower mould base outer surface other side and back other side all are installed with third cylinder, and two third cylinder output ends all are connected with the bottom plate.

[0007] Through adopt above technical scheme, first split lower mould and second split lower mould open, staff starts servo motor, servo motor starts and drives two -way screw rod to rotate after output end, two -way screw rod rotates and makes two nut bases approach each other through slide rail guide, two nut bases approach each other simultaneously, and because of nut base shape, top block is displaced on push frame, and servo motor is closed after top block displacement and its top side enters the clamping groove of several gaskets; For example, two gaskets are needed, and servo motor is closed after top block displacement and enters the clamping groove of two gaskets; Conversely, top block is withdrawn from the clamping groove of gasket when gasket is not needed; After adjusting the position of top block, the push frame is moved to the second cylinder direction by the second cylinder output end, the push frame is guided by the guide frame after displacement, the movement trajectory of the push frame is inclined upward, and the second cylinder is rotated during the movement; The top frame is pulled after the push frame moves, the top frame is also moved to the second cylinder direction, and the movement trajectory of the push frame is also inclined upward by the first guide groove and the nut base guide during the movement of the push frame; The gasket is pulled by the clamping groove after the push frame moves, and the gasket is also moved to the second cylinder direction, and the movement trajectory of the gasket is also inclined upward by the second guide groove and the supporting rod guide during the movement of the gasket; The gasket is lifted from the lower mould base after movement.

[0008] Further, the nut base cross section is "H" shape, and the nut base is slidably connected with the slide rail, the top block is slidably connected with the nut base through the first guide groove.

[0009] Through adopt above technical scheme, two nut bases approach each other simultaneously, and because of nut base shape, top block is displaced on push frame, and servo motor is closed after top block displacement and its top side enters the clamping groove of several gaskets.

[0010] Further, the guide frame cross section is "C" shape, and the push frame is slidably connected with the guide frame, the top block is slidably connected with the push frame, and the second cylinder is rotatably connected with the lower mould base.

[0011] Through the above technical scheme, the push frame is guided by the guide frame after displacement, so that the movement track of the push frame is an inclined upward movement, and the second cylinder rotates under stress during the movement; the push frame moves to pull the top frame, so that the top frame also moves to the second cylinder.

[0012] Further, the guide frame, the first guide groove and the second guide groove are all in a slope shape, and the gasket is slidably connected with the supporting rod through the second guide groove.

[0013] Through the above technical scheme, the guide frame, the first guide groove and the second guide groove are all in a slope shape, so as to facilitate the inclined upward movement of the push frame, the top block and the gasket, and the gasket is lifted from the lower die seat after movement, so as to facilitate the adjustment of the opening size.

[0014] Further, the top block is detachably connected with the hook groove.

[0015] Through the above technical scheme, the servo motor is turned off after the top block is displaced and the top side of the top block enters the clamping grooves of the gaskets; for example, if two gaskets are needed, the servo motor is turned off after the top block is displaced and enters the clamping grooves of the two gaskets; conversely, when the gaskets are not needed, the top block is withdrawn from the clamping grooves of the gaskets.

[0016] Further, the bottom of the lower die seat is provided with four first cylinders, the output ends of the four first cylinders are connected with four sliding seats, the top of the lower die seat is connected with a plurality of first split lower dies and a plurality of second split lower dies, a core rod and an inner hexagonal bolt are connected between the plurality of first split lower dies and the plurality of second split lower dies, and the four sliding seats are respectively connected with two of the first split lower dies and two of the second split lower dies.

[0017] Through the above technical scheme, after the gaskets are adjusted, the four first cylinders drive the four sliding seats to move reversely, so that the plurality of first split lower dies and the plurality of second split lower dies are away from each other, and the first split lower dies and the second split lower dies after moving away abut against the gaskets to limit the size of the opening of the second split lower dies, so that the material can be placed on the lower die to start the bending work by the force of the upper die, the core rod has high wear resistance, and the round shape reduces stress concentration, so that the indentation at the bending point can be effectively avoided.

[0018] Further, the sliding seat, the first split lower die and the second split lower die are all slidably connected with the lower die seat.

[0019] Through the above technical scheme, the staff starts the four first cylinders, the output ends of the four first cylinders drive the four sliding seats to displace after the four first cylinders are started, at this time, the two first split lower dies and the two second split lower dies are close to each other, and the force is transmitted through the core rod and the inner hexagonal bolt, so that the plurality of first split lower dies and the plurality of second split lower dies move synchronously, and the plurality of first split lower dies and the plurality of second split lower dies are close to each other.

[0020] Further, the first split lower mold and the second split lower mold are staggered.

[0021] By adopting the above technical scheme, the first split lower mold and the second split lower mold are staggered, which can avoid mutual conflict during movement.

[0022] Further, the outer ring of the supporting rod is provided with a plurality of balls, and the plurality of balls are arranged in a ring array.

[0023] By adopting the above technical scheme, the sliding friction is changed into rolling friction by the plurality of balls, the friction between the second guide groove and the supporting rod is reduced when the long gasket is pulled out, and thus the resistance is reduced; and the gasket is lifted from the lower mold base after movement.

[0024] Further, the supporting bottom plate is in contact with the gasket.

[0025] By adopting the above technical scheme, the third cylinder output end drives the displacement of the supporting bottom plate after the gasket is lifted, so as to support the tail end of the gasket and increase the structural stability.

[0026] In summary, the utility model mainly has the following beneficial effects:

[0027] 1、The utility model discloses a servo motor, a bidirectional screw rod, a nut base, a gasket and a hook groove are arranged;After the first split lower mold and the second split lower mold are opened, the staff starts the servo motor, the servo motor drives the bidirectional screw rod to rotate after starting, the bidirectional screw rod rotates and makes the two nut bases close to each other through the slide rail guide, and the two nut bases are close to each other at the same time, and the top block is displaced on the push frame due to the shape of the nut base, and the servo motor is turned off after the top block is displaced and the top side of the top block enters the clamping groove of the plurality of gaskets;For example, two gaskets are needed, and the servo motor is turned off after the top block is displaced and enters the clamping groove of the two gaskets;It is convenient to automatically control the plug-in quantity of the gasket, so as to conveniently automatically adjust the size of the lower mold opening.

[0028] 2, the utility model discloses a second cylinder, push frame, guide frame, first guide groove, second guide groove and the setting of supporting rod, after adjusting the position of the top block, the second cylinder output end pulls push frame, makes push frame move to the second cylinder direction, and push frame displacement is guided through guide frame, makes the movement track of push frame be inclined upward movement, and the second cylinder is stressed to rotate during period;Push frame moves and pulls the top frame, makes the top frame also move to the second cylinder direction, and push frame moves and is guided through the first guide groove cooperation nut seat, makes the movement track of push frame also be inclined upward movement;Push frame moves and is pulled through the slot gasket, makes gasket also move to the second cylinder direction, and gasket moves and is guided through the second guide groove cooperation supporting rod, makes the movement track of gasket also be inclined upward movement;Gasket moves and rises from the lower mould base;After adjusting gasket, four first cylinders drive four sliding seats reverse movement, thereby make a plurality of first split lower mould and a plurality of second split lower mould away, and the first split lower mould and second split lower mould after moving away are limited to gasket and stop, thereby limit the opening size of second split lower mould;Conveniently automatic plug-in gasket, thereby facilitate automatic regulation lower mould opening size;

[0029] 3, the utility model discloses the setting of third cylinder and the setting of supporting plate;Gasket rises and third cylinder output end drives supporting plate displacement, thereby support the tail end of gasket, increase structural stability;Conveniently support gasket, avoid supporting rod and be curved and be deformed and affect movement due to long-term downward pressure. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is structure schematic diagram of the utility model;

[0031] Figure 2 It is bottom structure schematic diagram of the utility model;

[0032] Figure 3 It is first split lower mould structure schematic diagram of the utility model;

[0033] Figure 4 It is lower mould base structure schematic diagram of the utility model;

[0034] Figure 5 It is gasket structure schematic diagram of the utility model;

[0035] Figure 6 It is top block explosion structure schematic diagram of the utility model;

[0036] Figure 7 It is supporting rod structure schematic diagram of the utility model.

[0037] In the figure: 1, lower die seat; 2, first cylinder; 3, slide; 4, first split lower die; 5, second split lower die; 6, core rod; 7, inner hexagonal bolt; 8, servo motor; 9, bidirectional screw rod; 10, nut seat; 11, second cylinder; 12, push bracket; 13, guide bracket; 14, top block; 15, first guide groove; 16, gasket; 17, second guide groove; 18, hook groove; 19, supporting rod; 20, ball; 21, third cylinder; 22, supporting bottom plate; 23, slide rail. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present application and cannot be understood as a limitation of the present application.

[0039] The embodiments of the present application will be described below according to the overall structure of the present application.

[0040] Embodiment one:

[0041] An opening-adjustable no-indentation bending lower die, like Figures 1-6As shown, including the lower die seat 1, the lower die seat 1 outer surface side is equipped with servo motor 8, servo motor 8 output end is connected with two way screw rod 9, two way screw rod 9 outside sleeve is connected with two nut seat 10, nut seat 10 section is “H” letter shape, nut seat 10 and slide rail 23 slidingly connected;The lower die seat 1 top side is provided with second cylinder 11, guide frame 13 and slide rail 23 respectively, second cylinder 11 is rotatably connected with the lower die seat 1, the output end of second cylinder 11 is connected with two top block 14 through push frame 12, guide frame 13 section is “C” letter shape, push frame 12 and guide frame 13 slidingly connected, top block 14 and push frame 12 slidingly connected, the bottom side of two top block 14 is provided with first guide slot 15, and top block 14 is slidingly connected with nut seat 10 through first guide slot 15;The lower die seat 1 is connected with multiple gaskets 16, the bottom of multiple gaskets is provided with two second guide slot 17 and a hook slot 18, top block 14 is detachably connected with hook slot 18, the outer surface of lower die seat 1 is penetrated by two supporting rods 19, guide frame 13, first guide slot 15 and second guide slot 17 are all inclined, gasket 16 is slidingly connected with supporting rod 19 through second guide slot 17, after the first split lower die 4 and the second split lower die 5 are opened, the staff starts servo motor 8, the output end of servo motor 8 drives two way screw rod 9 to rotate after starting, two way screw rod 9 rotates and guides through slide rail 23 to make two nut seat 10 close to each other, while two nut seat 10 are close to each other, due to the shape of nut seat 10, top block 14 is displaced on push frame 12, after top block 14 is displaced, its top side enters the clamping groove of several gaskets 16, and then servo motor 8 is turned off;For example, two gaskets 16 are needed, then servo motor 8 is turned off after top block 14 is displaced and enters the clamping groove of two gaskets 16;Conversely, when gasket 16 is not needed, top block 14 is withdrawn from the clamping groove of gasket 16;After adjusting the position of top block 14, the output end of second cylinder 11 pulls push frame 12, so that push frame 12 moves towards second cylinder 11, after push frame 12 is displaced, it is guided through guide frame 13, so that the movement track of push frame 12 is inclined upward movement, and during the period, second cylinder 11 rotates under stress;After push frame 12 moves, it pulls the top frame, so that the top frame also moves towards second cylinder 11, and when push frame 12 moves, it is guided through first guide slot 15 in cooperation with nut seat 10, so that the movement track of push frame 12 is also inclined upward movement;After push frame 12 moves, it pulls gasket 16 through the clamping groove, so that gasket 16 also moves towards second cylinder 11, and when gasket 16 moves, it is guided through second guide slot 17 in cooperation with supporting rod 19, so that the movement track of gasket 16 is also inclined upward movement;After gasket 16 moves, it rises from the lower die seat 1.

[0042] Referring to Figures 1-3In the above embodiment, the bottom of the lower die seat 1 is provided with four first cylinders 2, the output ends of the four first cylinders 2 are connected with four slides 3, the top of the lower die seat 1 is connected with a plurality of first split lower dies 4 and a plurality of second split lower dies 5, the slides 3, the first split lower dies 4 and the second split lower dies 5 are all in sliding connection with the lower die seat 1, the plurality of first split lower dies 4 and the plurality of second split lower dies 5 are staggered, a core rod 6 and an inner hexagonal bolt 7 are connected between the plurality of first split lower dies 4 and the plurality of second split lower dies 5, the four slides 3 are respectively connected with two of the first split lower dies 4 and two of the second split lower dies 5, after the gaskets 16 are adjusted, the four first cylinders 2 drive the four slides 3 to move reversely, so that the plurality of first split lower dies 4 and the plurality of second split lower dies 5 move away, the first split lower dies 4 and the second split lower dies 5 after moving away abut against the gaskets 16 to limit the opening size of the second split lower dies 5; at this time, the material can be placed on the lower die to start the bending operation by the upper die, the core rod 6 has high wear resistance due to high hardness, and the round shape reduces stress concentration, so that indentation at the bending point can be effectively avoided.

[0043] Embodiment two:

[0044] On the basis of the above embodiment one, in order to reduce the resistance, the following settings are made.

[0045] Referring to Figure 7 In the above embodiment, the outer circle of the supporting rod 19 is provided with a plurality of balls 20, the plurality of balls 20 are arranged in a ring array, the sliding friction is changed into rolling friction by the plurality of balls 20, the friction between the second guide groove 17 and the supporting rod 19 when the gasket 16 with long length is pulled out is reduced, and thus the resistance is reduced.

[0046] Embodiment three:

[0047] On the basis of the above embodiment one, in order to increase the stability of the structure, the following settings are made.

[0048] Referring to Figure 1 , Figure 2 and Figure 4 In the above embodiment, the other side and the back of the outer surface of the lower die seat 1 are both provided with a third cylinder 21, the output ends of the two third cylinders 21 are both connected with a supporting bottom plate 22, the supporting bottom plate 22 is in contact with the gasket 16, the output end of the third cylinder 21 drives the supporting bottom plate 22 to displace after the gasket 16 is lifted, so as to support the tail end of the gasket 16 and increase the stability of the structure.

[0049] The embodiment principle of the utility model is: firstly, the staff starts four first air cylinders 2, four first air cylinders 2 drive four sliding seats 3 to displace after starting, two first split lower moulds 4 and two second split lower moulds 5 are close to each other at this moment, and force is transmitted through core rod 6 and internal hexagonal bolt 7, make multiple first split lower moulds 4 and multiple second split lower moulds 5 synchronous movement, and multiple first split lower moulds 4 and multiple second split lower moulds 5 are close to each other;

[0050] After the first split lower mould 4 and the second split lower mould 5 are opened, the staff starts the servo motor 8, the output end of the servo motor 8 drives the bidirectional screw rod 9 to rotate after starting, the bidirectional screw rod 9 rotates and guides two nut seats 10 to be close to each other through the slide rail 23, two nut seats 10 are close to each other at the same time, due to the shape of the nut seat 10, the top block 14 is displaced on the push frame 12, the top block 14 is displaced and its top side enters the clamping groove of the several gaskets 16, and then the servo motor 8 is turned off; for example, two gaskets 16 are needed, then the top block 14 is displaced and enters the clamping groove of the two gaskets 16, and then the servo motor 8 is turned off; conversely, when the gasket 16 is not needed, the top block 14 is withdrawn from the clamping groove of the gasket 16;

[0051] After adjusting the position of the top block 14, the second cylinder 11 pulls the push frame 12 through the output end, and the push frame 12 moves towards the second cylinder 11, the push frame 12 is guided through the guide frame 13 after displacement, so that the movement track of the push frame 12 is inclined upward movement, and the second cylinder 11 rotates during the movement; the push frame 12 pulls the top frame after movement, so that the top frame also moves towards the second cylinder 11, and the movement track of the push frame 12 is also inclined upward movement through the cooperation of the first guide groove 15 and the nut seat 10 during the movement of the push frame 12; the push frame 12 pulls the gasket 16 through the clamping groove after movement, so that the gasket 16 also moves towards the second cylinder 11, and the movement track of the gasket 16 is also inclined upward movement through the cooperation of the second guide groove 17 and the supporting rod 19 during the movement of the gasket 16; and the sliding friction is changed into rolling friction through the setting of the plurality of ball bearings 20, so as to reduce the friction force between the second guide groove 17 and the supporting rod 19 when the long gasket 16 is pulled, thereby reducing the resistance; the gasket 16 is lifted from the lower mould base 1 after movement; the third cylinder 21 drives the bottom supporting plate 22 to displace through the output end after the gasket 16 is lifted, so as to support the tail end of the gasket 16 and increase the structural stability;

[0052] After adjusting the gasket 16, the four first air cylinders 2 drive the four sliding seats 3 to move reversely, so that the multiple first split lower moulds 4 and the multiple second split lower moulds 5 are far away from each other, and the first split lower mould 4 and the second split lower mould 5 are limited by the gasket 16 after moving away, so as to limit the opening size of the second split lower mould 5; at this moment, the material can be placed on the lower mould and the bending operation is started through the force of the upper mould, the core rod 6 has high wear resistance through high hardness, and the round shape reduces stress concentration, so as to effectively avoid indentation at the bending point;

[0053] When the gasket 16 needs to be extracted, the first cylinder 2 output end drives the slide 3 to displace, so that the first split lower die 4 and the second split lower die 5 are close to each other, the third cylinder 21 output end pulls the supporting bottom plate 22 back to the inner wall of the lower die seat 1 and separates from the gasket 16, the second cylinder 11 output end drives the push frame 12 to push, so that the top block 14 reversely translates to make the gasket 16 fall back, and finally the servo motor 8 output end drives the bidirectional screw rod 9 to reverse, so that the top block 14 and the hook groove 18 are reversed.

[0054] Although the embodiments of the utility model have been shown and described, the specific embodiments are only the explanation of the utility model, and are not the limitation of the utility model, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable way, the person skilled in the art can make the modification, replacement and change of the embodiment without the creative contribution after reading the specification without departing from the principles and the purpose of the utility model, but as long as in the right claim range of the utility model, it is protected by the patent law.

Claims

1. An open adjustable, without indentation, bending lower die, comprising a lower die seat (1), characterized in that: The lower die seat (1) is provided with a servo motor (8) on one side of its outer surface, and a bidirectional screw rod (9) is connected to the output end of the servo motor (8), and two nut seats (10) are sleeved outside the bidirectional screw rod (9); a second air cylinder (11), a guide frame (13) and a sliding rail (23) are arranged on one side of the top of the lower die seat (1), and two top blocks (14) are connected to the output end of the second air cylinder (11) through a push frame (12), and a first guide groove (15) is formed in one side of the bottom of each of the two top blocks (14); a plurality of spacers (16) are connected to the inside of the lower die seat (1), and two second guide grooves (17) and a hook groove (18) are formed in the bottom of each of the plurality of spacers (16), two supporting rods (19) penetrate through the outer surface of the lower die seat (1), and a third air cylinder (21) is arranged on the other side of the outer surface and the other side of the back of the lower die seat (1), and a supporting bottom plate (22) is connected to the output end of each of the two third air cylinders (21).

2. The open adjustable no imprint bend lower die of claim 1, wherein: The nut seat (10) is in "H" shape in cross section, and the nut seat (10) is slidably connected with the sliding rail (23), and the top block (14) is slidably connected with the nut seat (10) through the first guide groove (15).

3. The open adjustable, kiss-cut, bottom die of claim 2, wherein: The guide frame (13) is in "C" shape in cross section, and the push frame (12) is slidably connected with the guide frame (13), and the top block (14) is slidably connected with the push frame (12), and the second air cylinder (11) is rotatably connected with the lower die seat (1).

4. The open adjustable, kiss-cut, bottom die of claim 3, wherein: The guide frame (13), the first guide groove (15) and the second guide groove (17) are all in slope shape, and the spacer (16) is slidably connected with the supporting rod (19) through the second guide groove (17).

5. The open adjustable no imprint bend lower die of claim 3, wherein: The top block (14) is detachably connected with the hook groove (18).

6. The open adjustable, kiss-cut, bottom die of claim 1, wherein: Four first air cylinders (2) are arranged on the bottom of the lower die seat (1), and four sliding seats (3) are connected to the output ends of the four first air cylinders (2), a plurality of first split lower dies (4) and a plurality of second split lower dies (5) are connected to the top of the lower die seat (1), and a core rod (6) and an inner hexagonal bolt (7) are connected between the plurality of first split lower dies (4) and the plurality of second split lower dies (5), and the four sliding seats (3) are connected with two of the first split lower dies (4) and two of the second split lower dies (5) respectively.

7. The open adjustable, kiss-cut, bottom die of claim 6, wherein: The sliding seat (3), the first split lower die (4) and the second split lower die (5) are all slidably connected with the lower die seat (1).

8. The open adjustable, kiss-cut, bottom die of claim 7, wherein: The plurality of first split lower dies (4) and the plurality of second split lower dies (5) are staggered.

9. The open adjustable, kiss-cut, bottom bending die of claim 4, wherein: A plurality of balls (20) are arranged on the outer ring of the supporting rod (19), and the plurality of balls (20) are arranged in annular array.

10. The opening adjustable, impressionless bending lower die according to claim 1, characterized in that: The supporting bottom plate (22) is in contact with the spacer (16).

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