Adjustable lower die for bending machine

Abstract

The invention provides an adjustable lower die for a bending machine, which relates to the technical field of metal plate plastic processing and forming, and comprises a die outer shell, a module spacing adjusting mechanism, two groups of adjusting module single blocks, a first adjusting module, a second adjusting module, a third adjusting module, a fourth adjusting module and a fourth adjusting module, the electric telescopic rod is used for controlling the toothed plate to ascend and descend so that the pointed tooth block and the tooth groove can be clamped in a self-adaptive mode, independent rigid locking is provided to protect the transmission lead screw from being laterally pressed and abraded, moving fine adjustment is achieved through the hole diameter difference between the round rod and the through hole, accumulated tolerance is thoroughly eliminated, and the bending precision is ensured. And meanwhile, the air cylinder drives the trapezoidal block to jack so that the bottom height can be flexibly adjusted to adapt to plates with different thicknesses, the flexible supporting mechanism is introduced between the supporting table and the lower die cushion block, vertical downward pressing impact is effectively absorbed and buffered through deformation of the elastic piece and rotation of the damping rod, and therefore the overall service life of the die is greatly prolonged, and the system safety and stability are improved.

Description

Technical Field

[0001] This invention relates to the field of metal sheet plastic forming technology, and in particular to an adjustable lower die for a bending machine. Background Technology

[0002] In the field of sheet metal processing, bending machines are indispensable core plastic forming equipment. In actual production line operations, to adapt to sheet metal of varying thicknesses and diverse bending angle requirements, operators often need to frequently change the V-groove opening width of the lower die. Traditional one-piece replaceable lower dies not only consume a lot of manpower and downtime, but also pose significant safety hazards during the handling of large dies. Therefore, the industry has gradually adopted adjustable lower dies. These adjustable lower dies primarily utilize an internal drive transmission system to control the horizontal movement of the die blocks on both sides, thereby assembling the bending cavity with the required opening size. However, due to the extremely large stamping load generated by the upper die pressing down on the sheet metal during bending, the sheet metal in the yield deformation stage will generate extremely strong lateral expansion separation force and a violent vertical downward impact force on the inner wall of the lower die. This necessitates that the adjustable lower die, while possessing automated adjustment capabilities, must also provide absolutely stable rigid support and locking shaping ability after width positioning to prevent any displacement of the die under heavy stamping, thereby ensuring the angular consistency and dimensional accuracy of batch-processed parts.

[0003] Most existing conventional adjustable lower dies utilize servo motors to drive bidirectional lead screws to rotate, causing the nut sliders on both sides and the lower die stop to move synchronously in opposite directions, thereby adjusting the V-shaped opening width. While this existing technology achieves convenient adjustment of the lower die width, it suffers from a fatal flaw in high-frequency, heavy-load machining scenarios. The horizontal position of the lower die stop relies entirely on the self-locking force of the thread engagement between the lead screw and the nut to rigidly resist the enormous lateral extrusion force generated on both sides during sheet metal bending. This structure, which allows the transmission components to directly bear the ultimate load, leads to severe mechanical wear of the lead screw thread pair in a short period of time, inevitably accumulating a large transmission clearance error. Due to the lack of a bottom rigid bearing and secondary locking structure independent of the transmission system, once the lower die stop is subjected to force, these accumulated assembly tolerances and wear clearances will directly translate into lateral offset of the lower die stop, causing deviations in the actual bending angle and resulting in a sharp drop in the yield rate of the same batch of products. At the same time, this design, which treats the drive mechanism as the only point of force application, is extremely prone to fatigue deformation or even tooth breakage when faced with vertical rigid impacts that lack buffering. Summary of the Invention

[0004] The purpose of this invention is to solve the problem that the lead screw thread pair in the prior art is prone to severe mechanical wear during use, which leads to wear tolerance, and proposes an adjustable lower die for a bending machine.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an adjustable lower die for a bending machine, comprising a die housing, a module spacing adjustment mechanism disposed inside the die housing, two sets of adjustment module blocks slidably connected to the top of the die housing and drivenly connected to the module spacing adjustment mechanism to adjust the horizontal spacing between the two sets of adjustment module blocks by driving the module spacing adjustment mechanism, a base adjustment mechanism disposed inside the die housing and located below the two sets of adjustment module blocks for adjusting its own lifting height, and its top and the inner sidewalls of the two sets of adjustment module blocks together form a V-shaped lower die cavity for bending, and a module support mechanism disposed on the die housing and located directly below the adjustment module blocks for selectively engaging with the toothed structure at the bottom of the adjustment module blocks, thereby providing positioning and support for the adjustment module blocks after the spacing adjustment is completed.

[0006] Preferably, the mold housing includes an outer support housing and an annular top cover fixedly connected to the top of the outer support housing. The adjustment module includes a lower mold block, which is slidably disposed in the inner notch of the top of the annular top cover. Multiple sets of pointed tooth blocks are fixedly connected at equal intervals along the length direction of the bottom of the lower mold block, and the bottom end of the pointed tooth blocks has a triangular structure. A first through hole is vertically opened inside the lower mold block to establish a transmission connection with the module spacing adjustment mechanism.

[0007] Preferably, the module support mechanism includes two sets of first long plates fixedly connected to the bottom notch of the annular top cover. Multiple racks are fixedly connected at equal intervals along the horizontal direction on the top of the first long plates. A tooth groove is formed between two adjacent sets of racks to match the pointed tooth blocks. The pointed tooth blocks can be naturally inserted into the tooth grooves downwards, and the triangular structure at their bottom end enables adaptive guidance during insertion, thereby eliminating the assembly tolerance generated during spacing adjustment while locking.

[0008] Preferably, the first long plate has toothed plate slots connecting its upper and lower sides. The module support mechanism also includes an electric telescopic rod installed below the first long plate. The output end of the electric telescopic rod is fixedly connected to a connecting plate. The top of the connecting plate is fixedly connected to a second long plate. The top of the second long plate is fixedly connected to multiple sets of toothed plates that correspond one-to-one with the positions of the toothed plate slots.

[0009] Preferably, when the two sets of adjustment modules are in the spacing adjustment state, the electric telescopic rod retracts, driving the toothed plate upward through the toothed plate slot and into the tooth groove, so as to lift the pointed toothed block inserted into the tooth groove upward, so that only the bottom end of the pointed toothed block remains above the tooth groove and slides, thereby releasing the lower mold block and placing it in a free state that can be horizontally moved. When the two sets of adjustment modules are in the fixed operation state, the electric telescopic rod extends, the toothed plate moves downward away from the tooth groove, so that the pointed toothed block falls back completely and inserts into the tooth groove to complete the support and fixation.

[0010] Preferably, the module spacing adjustment mechanism includes a servo motor fixed to the side wall of the outer support housing. The output shaft of the servo motor passes through the interior and is connected to a first threaded rod. Two sets of converters are driven and connected to the first threaded rod. Each set of converters is synchronously driven and connected to a second threaded rod arranged laterally on both sides.

[0011] Preferably, the inner bottom surface of the outer support housing is fixed with two symmetrical inner guide plates parallel to the second threaded rods. Each set of second threaded rods is threaded with a slider, and the slider is engaged with the inner side of the inner guide plate to obtain translational guidance. The top of each set of sliders is vertically fixed with a round rod that extends upward and passes through the first through hole, so that when the slider is driven laterally, it can move the lower mold block synchronously. The diameter of the first through hole is slightly larger than the outer diameter of the round rod, so as to match the triangular end of the pointed tooth block and reserve lateral movement margin for the adaptive fine adjustment action when falling into the tooth groove.

[0012] Preferably, the base adjustment mechanism includes a cylinder horizontally installed on the bottom surface inside the mold housing. The output shaft of the cylinder is fixedly connected to a first trapezoidal block. A second trapezoidal block is slidably pressed onto the inclined surface of the first trapezoidal block. A support platform is horizontally fixedly connected to the top of the second trapezoidal block. A lower mold pad is provided above the support platform. The cylinder pushes the first trapezoidal block to move horizontally and uses the inclined surface to press the second trapezoidal block, thereby driving the support platform and the lower mold pad to perform vertical lifting and lowering adjustment as a whole.

[0013] Preferably, a lower guide plate is also fixedly connected inside the mold shell. The inner wall of the lower guide plate is adapted to the outer contour of the lower mold pad to limit and guide the vertical movement of the lower mold pad.

[0014] Preferably, a flexible support mechanism is provided between the support platform and the lower mold pad. The flexible support mechanism includes multiple sets of rotating bases fixed to the top of the support platform. A horizontal first damping rod is hinged to the rotating base. The other end of the first damping rod is rotatably connected to an intermediate block. An elastic element is sleeved on the outside of the first damping rod. The two ends of the elastic element are fixedly connected to the two ends of the corresponding first damping rod. A vertical second damping rod is connected to the bottom of the intermediate block. A support block is fixed to the top of the intermediate block. The top surface of the support block abuts against the bottom surface of the lower mold pad. When the lower mold pad is bent, the deformation of the damping rod and the elastic element buffers the instantaneous downward impact force.

[0015] Compared with the prior art, the advantages and positive effects of the present invention are as follows: 1. In this invention, by setting up a module support mechanism in conjunction with an adjustment module block with a pointed toothed block at the bottom, after the servo motor drives the slider to move laterally to adjust the lower die opening distance, the electric telescopic rod controls the tooth plate to move up and down, so that the pointed toothed block can adaptively insert and engage with the tooth groove. This not only provides a bottom rigid bearing and locking force independent of the transmission screw during bending and stamping, greatly protecting the transmission mechanism from lateral extrusion and wear, but also the hole diameter difference design between the round rod and the first through hole provides a fine-tuning margin for the triangular structure at the bottom of the pointed toothed block to fall into the tooth groove. This cleverly and thoroughly eliminates the assembly and wear tolerances accumulated by the long-term operation of the screw drive, ensuring the accurate and consistent bending angle under high-frequency heavy-load operation.

[0016] 2. In this invention, a cylinder drives a horizontal trapezoidal block to lift the support platform and the lower mold pad, enabling flexible adjustment of the bottom height of the lower mold to adapt to the processing requirements of plates of different thicknesses. At the same time, an innovative flexible support mechanism consisting of a rotating base damping rod and an elastic element is introduced between the support platform and the lower mold pad. When the upper mold presses down on the metal plate and generates an instantaneous vertical rigid impact, this flexible mechanism can effectively absorb and buffer the destructive downward pressure stress through the compression deformation of the elastic element and the rotation of the damping rod's connecting rod, thereby significantly extending the overall service life of the mold and improving the safety and stability of the system operation. Attached Figure Description

[0017] Figure 1 This invention provides a three-dimensional structural schematic diagram of an adjustable lower die for a bending machine; Figure 2 This invention proposes an adjustable lower die for a bending machine. Figure 1 The structural diagram below; Figure 3 This invention provides a schematic diagram of the internal structure of an adjustable lower die for a bending machine; Figure 4 This invention provides a structural schematic diagram of a single adjustable module block in an adjustable lower die for a bending machine; Figure 5 This invention provides a schematic diagram of the bottom structure of a single adjustable module block in an adjustable lower die for a bending machine. Figure 6 This invention provides a schematic diagram of the structure of the base adjustment mechanism in an adjustable lower die for a bending machine; Figure 7 This invention provides a side sectional view of the module support mechanism in an adjustable lower die for a bending machine. Figure 8 This invention provides a schematic diagram of the bottom structure of the module support mechanism in an adjustable lower die for a bending machine; Figure 9 This invention provides a schematic diagram of the structure at point A in an adjustable lower die for a bending machine; Figure 10 This invention provides a schematic diagram of the structure at point B in an adjustable lower die for a bending machine; Figure 11 This invention provides a schematic diagram of the structure at point C in an adjustable lower die for a bending machine; Figure 12 This invention provides a schematic diagram of the structure at point D in an adjustable lower die for a bending machine.

[0018] Legend: 100, Mold outer shell; 200, Module support mechanism; 300, Adjustable module block; 400, Module spacing adjustment mechanism; 500, Base adjustment mechanism; 600, Flexible support mechanism; 101, Outer support shell; 102, Annular upper cover; 103, Lower guide plate; 104, Inner guide plate; 201, First long plate; 202, Rack; 203, Gear groove; 204, Gear plate slot; 205, Electric telescopic rod; 206, Connecting plate; 207, Second long plate; 208, Gear plate; 301. Lower mold block; 302. First through hole; 303. Pointed tooth block; 401. Servo motor; 402. First threaded rod; 403. Converter; 404. Second threaded rod; 405. Slider; 406. Round rod; 501. Cylinder; 502. First trapezoidal block; 503. Support platform; 504. Second trapezoidal block; 505. Lower mold pad; 601. Rotating base; 602. First damping rod; 603. Intermediate block; 604. Elastic element; 605. Second damping rod; 606. Support block. Detailed Implementation

[0019] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0020] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways than those described herein, and therefore the invention is not limited to the specific embodiments disclosed in the following specification.

[0021] Example 1: As Figures 1-5 as well as Figures 7-11 As shown, this invention provides an adjustable lower die for a bending machine, including a die housing 100, a module spacing adjustment mechanism 400 disposed inside the die housing 100, two sets of adjustment module blocks 300 slidably connected to the top of the die housing 100 and drivenly connected to the module spacing adjustment mechanism 400 to adjust the horizontal spacing between the two sets of adjustment module blocks 300 by the drive of the module spacing adjustment mechanism 400, a base adjustment mechanism 500 disposed inside the die housing 100 and located below the two sets of adjustment module blocks 300 for adjusting its own lifting height, and its top and the inner sidewalls of the two sets of adjustment module blocks 300 together form a V-shaped lower die cavity for bending, and a module support mechanism 200 disposed in the die housing. The mold housing 100 is located directly below the adjustment module block 300 and is selectively inserted and engaged with the toothed structure at the bottom of the adjustment module block 300 to provide positioning and support for the adjustment module block 300 after the spacing adjustment is completed. The mold housing 100 includes an outer support housing 101 and an annular top cover 102 fixedly connected to the top of the outer support housing 101. The adjustment module block 300 includes a lower mold block 301 slidably disposed in the inner notch at the top of the annular top cover 102, and multiple sets of pointed toothed blocks 303 with triangular bottom structures are fixedly connected at equal intervals along the length direction of the bottom of the lower mold block 301. The lower mold block 301 has a first through hole 302 vertically opened inside to establish a transmission connection with the module spacing adjustment mechanism 400.

[0022] The module support mechanism 200 includes two sets of first long plates 201 fixedly connected to the bottom notch of the annular top cover 102. Multiple racks 202 are fixedly connected at equal intervals along the horizontal direction on their tops. Adjacent sets of racks 202 form toothed grooves 203 that fit the pointed toothed blocks 303. The pointed toothed blocks 303 can naturally insert downwards into the toothed grooves 203, and their triangular structure at the bottom allows for adaptive guidance during insertion, thereby eliminating assembly tolerances caused by spacing adjustments while locking. The first long plates 201 have toothed plate slots 204 connecting their upper and lower sides. The module support mechanism 200 also includes an electric telescopic rod 205 installed below the first long plates 201, with a connecting plate 206 fixedly connected to its output end. The top of the connecting plate 206 is fixed... A second long plate 207 has multiple sets of toothed plates 208 fixedly connected to its top, each corresponding to a toothed plate slot 204. When the two sets of adjustment module blocks 300 are in the spacing adjustment state, the electric telescopic rod 205 retracts, causing the toothed plates 208 to pass upward through the toothed plate slot 204 and enter the tooth groove 203, thereby lifting the pointed toothed block 303 inserted into the tooth groove 203 upward, so that only the bottom end of the pointed toothed block 303 remains above the tooth groove 203 and slides, thereby unlocking the lower mold block 301 and placing it in a free state that can be horizontally moved. When the two sets of adjustment module blocks 300 are in the fixed operation state, the electric telescopic rod 205 extends and the toothed plates 208 disengage downward from the tooth groove 203, causing the pointed toothed block 303 to fall back completely and insert into the tooth groove 203 to complete the support and fixation.

[0023] During the actual processing preparation stage, when the operator issues the adjustment command, the electric telescopic rod 205 in the module support mechanism 200 responds first and retracts, driving the toothed plate 208 to push upward, thereby lifting the pointed toothed block 303 at the bottom of the lower die block 301 and disengaging it from the meshing state with the tooth groove 203, so that the entire adjustment module block 300 is in a free mode to eliminate bottom interference friction during lateral translation. When the module spacing adjustment mechanism 400 pushes the lower die block 301 to the specified processing opening width, the electric telescopic rod 205 extends in the opposite direction, causing the toothed plate 208 to descend and remove the lifting force. At this time, the pointed toothed block 303 re-inserts into the tooth groove 203 on the first long plate 201 under its own weight, using the physical guiding characteristics of the bottom triangular inclined surface to correct the lateral position and complete the final support and fixation. This lifting and locking logic separates the translation adjustment from the stamping load, so that the lateral expansion force generated by the heavy pressure is absorbed by the rack 202 and the tooth groove 203 to protect the transmission components of the module spacing adjustment mechanism 400.

[0024] Example 2: As Figure 3 and Figure 12As shown, the module spacing adjustment mechanism 400 includes a servo motor 401 fixed to the side wall of the outer support housing 101, whose output shaft extends through the interior and is connected to a first threaded rod 402. Two sets of converters 403 are driven and connected to the first threaded rod 402, and each set of converters 403 has a second threaded rod 404 horizontally connected to both sides on a synchronously driven basis. Two symmetrical inner guide plates 104 parallel to the second threaded rods 404 are fixed to the inner bottom surface of the outer support housing 101. Multiple sets of second threaded rods... Each rod 404 is threaded with a slider 405, and the slider 405 is snapped into the inner side of the inner guide plate 104 to obtain translational guidance. The top of each set of sliders 405 is vertically fixedly connected with a round rod 406 that extends upward and passes through the first through hole 302 so that when the slider 405 is driven laterally, it can move the lower mold block 301 synchronously. The diameter of the first through hole 302 is larger than the outer diameter of the round rod 406 so as to cooperate with the adaptive fine adjustment action when the pointed tooth block 303 falls into the tooth groove 203 and reserve the lateral movement margin.

[0025] Upon receiving the spacing adjustment command, the servo motor 401 outputs rotational torque, which is transmitted to the converter 403 via the first threaded rod 402. The converter 403 then synchronously distributes the rotational motion to the second threaded rods 404 arranged laterally on both sides. This causes the slider 405 to move synchronously in opposite directions along a straight trajectory under the limit of the inner guide plate 104. At this time, the round rod 406 fixed on the top of the slider 405 pushes the lower die block 301 to move in the notch inside the annular cover 102. A dimensional gap is left between the round rod 406 and the first through hole 302, so that the adjustment module block 300 undergoes adaptive lateral displacement at the moment of final locking due to the triangular inclined guide of the pointed tooth block 303. This hole diameter difference play allowance can absorb the position correction amount, solving the problem of processing angle deviation caused by component wear due to long-term operation of the bending machine.

[0026] Example 3: As Figure 3 , Figure 6 and Figure 9As shown, firstly, the first damping rod 602 adopts an industrial standard fluid hydraulic damper or a high-friction damping sleeve. The elastic element 604 is preferably a polyurethane high-elastic rubber column with a high fatigue limit or a silicon-chromium alloy helical compression spring. The value range of its elastic coefficient k should be matched and selected according to the ultimate yield strength of the material to be processed. The base adjustment mechanism 500 includes a cylinder 501 horizontally installed on the bottom surface inside the mold housing 100. Its output shaft is fixedly connected to a first trapezoidal block 502. A second trapezoidal block 504 is slidably pressed on the inclined surface of the first trapezoidal block 502. A support platform 503 is horizontally fixedly connected to its top, and a lower mold pad 505 is set above the support platform 503. The cylinder 501 pushes the first trapezoidal block 502 horizontally to cause horizontal displacement and uses the inclined surface to squeeze the second trapezoidal block 504, thereby driving the support platform 503 and the lower mold pad 505 to perform vertical lifting and lowering adjustment as a whole. The lower guide plate 103 is also fixedly connected to the lower mold pad 505. Its inner wall is adapted to the outer contour of the lower mold pad 505 to limit and guide the vertical movement of the lower mold pad 505. A flexible support mechanism 600 is provided between the support platform 503 and the lower mold pad 505. It includes multiple sets of rotating bases 601 fixed to the top of the support platform 503. A horizontal first damping rod 602 is hinged on the rotating base 601. The other end is rotatably connected to a middle block 603. An elastic element 604 is sleeved on the outside of the first damping rod 602. The two ends of the elastic element 604 are fixedly connected to the two ends of the corresponding first damping rod 602. A vertical second damping rod 605 is connected to the bottom of the middle block 603. A support block 606 is fixed on the top. The top surface of the support block 606 abuts against the bottom surface of the lower mold pad 505 so that the deformation of the damping rod and the elastic element 604 can buffer the instantaneous downward impact force when the lower mold pad 505 is bent.

[0027] When dealing with metal sheets of different thicknesses and needing to change the height of the lower die's working reference surface, cylinder 501 is activated and pushes the first trapezoidal block 502 at the bottom horizontally. Utilizing the inclined tangential lifting force generated on the mating surfaces of the two trapezoidal blocks, the support platform 503 and the lower die pad 505 supported above are lifted to the set height along the trajectory of the lower guide plate 103. At the moment the equipment enters the heavy-pressure bending stage, the vertical impact force generated by the upper die pressing the sheet metal acts directly on the lower die pad 505. At this time, the flexible support mechanism 600 intervenes, and the stress of the falling workpiece forces the middle block 603 to shift downward, causing the first damping rods 602 arranged horizontally on both sides to rotate and deflect. This converts the rigid destructive force in the vertical direction into deformation of the external elastic element 604. Combined with the attenuation effect inside the first damping rod 602, this absorbs and buffers the stamping vibration, thereby extending the fatigue life of the die.

[0028] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. An adjustable lower die for a bending machine, characterized in that, include: Mold outer shell (100); A module spacing adjustment mechanism (400) is disposed inside the mold housing (100); Two sets of adjustment module blocks (300) are slidably connected to the top of the mold housing (100) and are connected to the module spacing adjustment mechanism (400) for transmission, so as to adjust the horizontal spacing between the two sets of adjustment module blocks (300) by driving the module spacing adjustment mechanism (400). The base adjustment mechanism (500) is located inside the mold housing (100) and below the two sets of adjustment module blocks (300), and is used to adjust its own lifting height. Its top and the inner sidewalls of the two sets of adjustment module blocks (300) together form a V-shaped lower mold cavity for bending. And a module support mechanism (200) is provided on the mold housing (100) and located directly below the adjustment module block (300), for selectively engaging with the toothed structure at the bottom of the adjustment module block (300), thereby providing positioning and support for the adjustment module block (300) after the spacing adjustment is completed.

2. The adjustable lower die for a bending machine according to claim 1, characterized in that: The mold housing (100) includes an outer support housing (101) and an annular top cover (102) fixedly connected to the top of the outer support housing (101). The adjustment module block (300) includes a lower mold block (301). The lower mold block (301) is slidably disposed in the inner notch at the top of the annular top cover (102). Multiple sets of pointed tooth blocks (303) are fixedly connected at equal intervals along the length direction of the bottom of the lower mold block (301), and the bottom end of the pointed tooth block (303) has a triangular structure. A first through hole (302) is vertically opened inside the lower mold block (301) to establish a transmission connection with the module spacing adjustment mechanism (400).

3. The adjustable lower die for a bending machine according to claim 2, characterized in that: The module support mechanism (200) includes two sets of first long plates (201) fixedly connected to the bottom notch of the annular cover (102). Multiple racks (202) are fixedly connected at equal intervals along the horizontal direction on the top of the first long plate (201). A tooth groove (203) is formed between two adjacent sets of racks (202) to match the pointed tooth block (303). The pointed tooth block (303) can be naturally inserted into the tooth groove (203) downwards, and the triangular structure at its bottom end enables adaptive guidance during insertion, thereby eliminating the assembly tolerance generated during the spacing adjustment while locking.

4. The adjustable lower die for a bending machine according to claim 3, characterized in that: The first long plate (201) has a toothed plate slot (204) connecting its upper and lower sides. The module support mechanism (200) also includes an electric telescopic rod (205) installed below the first long plate (201). The output end of the electric telescopic rod (205) is fixedly connected to a connecting plate (206). The top of the connecting plate (206) is fixedly connected to a second long plate (207). The top of the second long plate (207) is fixedly connected to multiple sets of toothed plates (208) that correspond one-to-one with the positions of the toothed plate slot (204).

5. An adjustable lower die for a bending machine according to claim 4, characterized in that: When the two sets of adjustment module blocks (300) are in the spacing adjustment state, the electric telescopic rod (205) retracts, driving the toothed plate (208) upward through the toothed plate slot (204) and into the toothed groove (203), so as to lift the pointed toothed block (303) inserted into the toothed groove (203) upward, so that only the bottom end of the pointed toothed block (303) remains above the toothed groove (203) and slides, thereby causing the lower mold block (301) to be unlocked and in a free state that can be horizontally moved. When the two sets of adjustment module blocks (300) are in the fixed operation state, the electric telescopic rod (205) extends, the toothed plate (208) moves downward away from the toothed groove (203), so that the pointed toothed block (303) falls back completely and inserts into the toothed groove (203) to complete the support and fixation.

6. An adjustable lower die for a bending machine according to claim 3, characterized in that: The module spacing adjustment mechanism (400) includes a servo motor (401) fixed to the side wall of the outer support housing (101). The output shaft of the servo motor (401) passes through the interior and is connected to a first threaded rod (402). Two sets of converters (403) are driven and connected on the first threaded rod (402). Each set of converters (403) is synchronously driven and connected to a second threaded rod (404) arranged laterally on both sides.

7. An adjustable lower die for a bending machine according to claim 6, characterized in that: The inner bottom surface of the outer support housing (101) is fixed with two symmetrical inner guide plates (104) parallel to the second threaded rods (404). Multiple sets of the second threaded rods (404) are threaded with sliders (405), and the sliders (405) are engaged with the inner side of the inner guide plates (104) to obtain translational guidance. The top of each set of sliders (405) is vertically fixed with a round rod (406) that extends upward and passes through the first through hole (302) so that when the slider (405) is driven laterally, it can move the lower mold block (301) synchronously. The diameter of the first through hole (302) is slightly larger than the outer diameter of the round rod (406) to match the triangular end of the pointed tooth block (303) and reserve a lateral movement margin for the adaptive fine adjustment action when falling into the tooth groove (203).

8. An adjustable lower die for a bending machine according to claim 1, characterized in that: The base adjustment mechanism (500) includes a cylinder (501) horizontally installed on the bottom surface inside the mold housing (100). The output shaft of the cylinder (501) is fixedly connected to a first trapezoidal block (502). A second trapezoidal block (504) is slidably pressed on the inclined surface of the first trapezoidal block (502). A support platform (503) is horizontally fixedly connected to the top of the second trapezoidal block (504). A lower mold pad (505) is provided above the support platform (503). The cylinder (501) pushes the first trapezoidal block (502) to a horizontal displacement and uses the inclined surface to squeeze the second trapezoidal block (504), thereby driving the support platform (503) and the lower mold pad (505) to perform vertical lifting and lowering adjustment as a whole.

9. An adjustable lower die for a bending machine according to claim 8, characterized in that: The mold housing (100) is also fixedly connected to a lower guide plate (103). The inner wall of the lower guide plate (103) is adapted to the outer contour of the lower mold pad (505) to limit and guide the vertical movement of the lower mold pad (505).

10. An adjustable lower die for a bending machine according to claim 8, characterized in that: A flexible support mechanism (600) is provided between the support platform (503) and the lower mold pad (505). The flexible support mechanism (600) includes multiple sets of rotating bases (601) fixed to the top of the support platform (503). A horizontal first damping rod (602) is hinged to the rotating base (601). The other end of the first damping rod (602) is rotatably connected to an intermediate block (603), and an elastic element (604) is sleeved on the outside of the first damping rod (602). The two ends of the elastic element (604) are respectively fixedly connected to the two ends of the corresponding first damping rod (602). The bottom of the middle block (603) is connected to a vertical second damping rod (605), and a support block (606) is fixed on its top. The top surface of the support block (606) abuts against the bottom surface of the lower die pad (505) so that when the lower die pad (505) is bent, the deformation of the damping rod and the elastic element (604) can buffer the instantaneous downward impact force.

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