Sheet metal forming drawing die based on adaptive gap adjustment structure

Abstract

The present invention relates to the field of drawing die technology and discloses a sheet metal forming drawing die based on an adaptive gap adjustment structure, comprising a frame; a die portion, the die portion comprising a die and a punch, the die being slidably connected to the frame via a guide column disposed at its top, the punch being disposed directly below the die, and a press ring being disposed at the top of the punch; wherein the press ring comprises a fixed ring and a floating ring, and an adjustment member is disposed at the top of the floating ring for adjusting the distance between the fixed ring and the floating ring. The sheet metal forming drawing die based on the adaptive gap adjustment structure can effectively solve the problem in the prior art that traditional drawing dies are only suitable for sheets of a specific thickness. When processing sheets of other thicknesses, manual gap adjustment is often required to adapt. This adjustment method is not only inefficient but also difficult to ensure the accuracy of the gap. If the gap does not match the sheet metal, defects such as cracking and wrinkling may occur in the sheet metal during drawing.

Description

Technical Field

[0001] The present invention relates to the technical field of drawing dies, and in particular to a plate forming drawing die based on an adaptive gap adjustment structure. Background Art

[0002] The drawing die is a core element of the drawing process. With its significant advantages of fast forming speed and stable product quality, it is suitable for large-scale production scenarios. The drawing die primarily consists of a die, a blank holder, and a punch. When the punch and die are closed, the interaction between the punch and die causes the sheet metal to undergo plastic deformation, ultimately forming the desired drawn part shape.

[0003] In the drawing die, the gap parameters between the blank holder and the die directly determine the flow characteristics and deformation behavior of the sheet during the forming process. Since traditional drawing dies are only suitable for sheets of a specific thickness, when processing sheets of other thicknesses, it is often necessary to manually adjust the gap to adapt. This adjustment method is not only inefficient, but also difficult to ensure the accuracy of the gap. If the gap does not match the sheet, it will cause defects such as cracking and wrinkling in the sheet during drawing. Repeated die repairs are required in the later stage, and even the drawn parts may be scrapped, which has a double negative impact on production efficiency and manufacturing costs. Summary of the Invention

[0004] In response to the above-mentioned shortcomings of the prior art, the present invention provides a plate forming drawing die based on an adaptive gap adjustment structure, which can effectively solve the problem in the prior art that traditional drawing dies are only suitable for plates of a specific thickness. When processing plates of other thicknesses, it is often necessary to manually adjust the gap to adapt. This adjustment method is not only inefficient, but also difficult to ensure the accuracy of the gap. The gap is not compatible with the plate, which will cause defects such as cracking and wrinkling of the plate during drawing.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0006] The present invention provides a plate forming drawing die based on an adaptive gap adjustment structure, comprising:

[0007] frame;

[0008] The mold part includes a die and a punch. The die is slidably connected to the frame via a guide column provided at the top. The punch is detachably installed inside the frame. The punch is provided directly below the die. A pressing ring is provided at the top of the punch.

[0009] The pressing ring includes a fixed ring and a floating ring. The floating ring is slidably connected to the fixed ring through a sliding hole provided on the outside. An adjusting member is provided on the top of the floating ring for adjusting the distance between the fixed ring and the floating ring.

[0010] The weight of the plate increases, and when the adjusting member is opened, the floating ring can be driven to move relative to the fixed ring, so as to increase the distance between the floating ring and the fixed ring.

[0011] Furthermore, it also includes a driving unit fixedly connected to the inside of the frame, and the output end of the driving unit is connected to the top of the die.

[0012] Furthermore, the floating ring is connected to the top of the fixed ring through an elastic member arranged at its bottom. There are multiple elastic members distributed along the center array of the floating ring. The bottom of the fixed ring is connected to the top of the punch through an elastic mechanism.

[0013] Furthermore, the floating ring is slidably connected to a pressing plate that fits the pressing surface of the bottom of the die through a slot opened on its top, and the bottom of the pressing plate is connected to the inner wall of the slot through a round wire spring. There are multiple round wire springs distributed along the pressing plate array, and the bottom edge of the pressing plate is designed to be inclined.

[0014] Furthermore, the adjusting member includes a slide groove opened on the top of the floating ring, and the slide groove is provided with two and is symmetrically distributed along the center of the floating ring. A wedge block that fits the inclined surface of the pressing plate is slidably connected in the slide groove;

[0015] Both sides of the side wall of the floating ring are provided with movable cavities, and there are two movable cavities that are symmetrically distributed along the sliding groove. The movable cavity includes a movable groove and a guide hole that are interconnected. Both sides of the side wall of the fixed ring are provided with a sliding groove, and the sliding groove is located directly below the movable cavity. The adjacent side walls of the movable groove and the sliding groove are provided with inclined surfaces.

[0016] Furthermore, an abutment block is slidably connected in the sliding groove and fits with the inner wall of the movable groove, and the abutment block is designed with an inclined surface close to the pressing plate. The abutment block is connected to the end of the wedge block through a connecting rod arranged at its end, and the middle part of the side wall of the fixed ring is fixedly connected to a fixed shaft rotatably connected to the inside of the connecting rod.

[0017] Furthermore, the abutment block is slidably connected to an L-shaped correction plate that fits the inner wall of the guide hole through an open groove opened on its top. A reset spring connected to the outer side of the L-shaped correction plate is provided in the open groove. A magnetic part is fixedly connected to the inside of the L-shaped correction plate. The inner wall of the guide hole and the magnetic part are connected by magnetic force. The end of the L-shaped correction plate is designed to be an arc shape.

[0018] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0019] The present invention is provided with an adjusting part and a pressing ring. Through the mechanical linkage between the wedge block, the "lever" formed by the connecting rod and the inclined surface in the adjusting part, the gap adjustment can be automatically triggered according to the change of the thickness of the plate. The entire process does not require shutdown or manual intervention, which significantly improves the degree of production automation and adjustment efficiency. The adjusting part drives the pressing plate to move downward according to the change of the plate's own gravity, and the inclined surface force pushes the wedge block to move horizontally. The displacement is amplified through the lever principle (the fixed axis is close to the abutment block, and the power arm is greater than the resistance arm), and the floating ring and the fixed ring are stretched open, so that the gap can change linearly with the change of the plate thickness, ensuring that the plate flows evenly during plastic deformation and maintaining the optimal pressing state. When the thickness of the plate increases and sinks, the L-shaped correction plates on both sides move toward the center and contact synchronously, offsetting the tilting trend of the plate caused by the offset of the center of gravity. The L-shaped correction plates are symmetrically arranged, and supporting force is applied synchronously from both sides of the plate, which can effectively balance the unilateral load caused by the change of the plate's own weight, avoid local deformation caused by unilateral force, and help to extend the service life of the mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0021] Figure 1 This is a schematic diagram of the main structure of an embodiment of the present invention;

[0022] Figure 2 Schematic diagram of the three-dimensional separation structure of the male mold according to an embodiment of the present invention;

[0023] Figure 3 Schematic diagram of the three-dimensional separation structure of the female mold according to an embodiment of the present invention;

[0024] Figure 4 Schematic diagram of the structure of the three-dimensional state transformation of the male mold and the female mold according to the embodiment of the present invention;

[0025] Figure 5 Schematic diagram of the three-dimensional separation structure of the binder ring according to an embodiment of the present invention;

[0026] Figure 6 Schematic diagram of the cross-sectional structure of the fixed ring and the floating ring according to an embodiment of the present invention;

[0027] Figure 7 For the embodiment of the present invention Figure 6 A schematic diagram of the structure at center A;

[0028] Figure 8 This is a schematic diagram of the three-dimensional separation structure of the pressing ring and the adjusting member according to an embodiment of the present invention;

[0029] Figure 9 For the embodiment of the present invention Figure 8 A magnified schematic diagram of the structure at point B in the middle.

[0030] The numbers in the figure represent: 1. frame; 11. driving unit; 2. mold part; 21. die; 22. punch; 23. pressing ring; 231. fixed ring; 232. floating ring; 2321. elastic part; 2322. notch; 2323. pressing plate; 2324. round wire spring; 233. adjusting part; 2331. slide groove; 2332. wedge block; 2333. movable cavity; 2334. sliding groove; 2335. abutment block; 2336. connecting rod; 2337. fixed shaft; 2338. L-shaped correction plate; 2339. magnetic part. DETAILED DESCRIPTION

[0031] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0032] The present invention will be further described below with reference to the embodiments.

[0033] Example:

[0034] See also Figures 1-9 The present invention provides a technical solution: a plate forming drawing die based on an adaptive gap adjustment structure, comprising:

[0035] The present invention provides a plate forming drawing die based on an adaptive gap adjustment structure, comprising:

[0036] Rack 1;

[0037] The mold part 2 includes a die 21 and a punch 22. The die 21 is slidably connected to the frame 1 through a guide column provided at the top thereof. The punch 22 is detachably installed inside the frame 1. The punch 22 is provided directly below the die 21. A pressing ring 23 is provided at the top of the punch 22.

[0038] The pressing ring 23 includes a fixed ring 231 and a floating ring 232. The floating ring 232 is slidably connected to the fixed ring 231 through a sliding hole provided on the outside. An adjusting member 233 is provided on the top of the floating ring 232 for adjusting the distance between the fixed ring 231 and the floating ring 232.

[0039] The weight of the plate increases, and when the adjusting member 233 is opened, the floating ring 232 can be driven to move relative to the fixed ring 231 , so as to increase the distance between the floating ring 232 and the fixed ring 231 .

[0040] The machine frame 1 further includes a driving unit 11 fixedly connected to the inside of the machine frame 1 , and the output end of the driving unit 11 is connected to the top of the die 21 .

[0041] The floating ring 232 is connected to the top of the fixed ring 231 through an elastic member 2321 provided at the bottom thereof. There are multiple elastic members 2321 distributed in an array along the center of the floating ring 232. The bottom of the fixed ring 231 is connected to the top of the punch 22 through an elastic mechanism.

[0042] The floating ring 232 is slidably connected to a pressing plate 2323 that fits the pressing surface at the bottom of the die 21 through a slot 2322 opened at its top, and the bottom of the pressing plate 2323 is connected to the inner wall of the slot 2322 through a round wire spring 2324. There are multiple round wire springs 2324 and they are distributed in an array along the pressing plate 2323. The bottom edge of the pressing plate 2323 is designed to be inclined.

[0043] The adjusting member 233 includes two slide grooves 2331 formed on the top of the floating ring 232 and symmetrically distributed along the center of the floating ring 232. A wedge block 2332 is slidably connected to the slide grooves 2331 and is in contact with the inclined surface of the pressing plate 2323.

[0044] Active cavities 2333 are provided on both sides of the side walls of the floating ring 232, and there are two active cavities 2333 that are symmetrically distributed along the sliding groove 2331. The active cavities 2333 include movable grooves and guide holes that are interconnected. Sliding grooves 2334 are provided on both sides of the side walls of the fixed ring 231, and the sliding grooves 2334 are located directly below the active cavities 2333. The adjacent side walls of the movable grooves and the sliding grooves 2334 are provided with inclined surfaces.

[0045] An abutment block 2335 that fits into the inner wall of the movable groove is slidably connected in the sliding groove 2334, and the abutment block 2335 is designed with an inclined surface close to the pressing plate 2323. The abutment block 2335 is connected to the end of the wedge block 2332 through a connecting rod 2336 arranged at its end, and a fixed shaft 2337 that is rotatably connected to the inside of the connecting rod 2336 is fixedly connected to the middle of the side wall of the fixed ring 231.

[0046] The abutment block 2335 is slidably connected to an L-shaped correction plate 2338 that fits the inner wall of the guide hole through an open groove on its top. A return spring connected to the outer side of the L-shaped correction plate 2338 is provided in the open groove. A magnetic part 2339 is fixedly connected to the inside of the L-shaped correction plate 2338. The inner wall of the guide hole and the magnetic part 2339 are connected by magnetic force. The end of the L-shaped correction plate 2338 is designed to be an arc shape.

[0047] The working principle and advantages of the sheet metal forming drawing die based on the adaptive gap adjustment structure:

[0048] Sheet drawing preparation stage:

[0049] During actual use, the operator checks the relevant conditions of the die 21 and the punch 22 in the mold part 2, such as whether the working surfaces of the die 21 and the punch 22 have defects such as cracks, wear, scratches, depressions or oxidation rust, and confirms whether the mold cutting edge (such as the pressure ring, the entrance of the die 21) is sharp and has no cracks or gaps, so as to avoid scratches or tears on the surface of the plate during drawing, thereby affecting the drawing effect of the plate.

[0050] Sheet drawing stage:

[0051] After the mold section 2 is inspected, the operator uses an external feeder (such as a servo feeder, automatic feeder line, or robotic feeder system) to place the sheet metal to be drawn onto the upper surface of the floating ring 232. When the sheet metal to be drawn is placed on the upper surface of the floating ring 232, it first contacts the blank holder 2323. If the sheet metal to be drawn is of standard thickness, the blank holder 2323, in conjunction with the coil spring 2324 below it, stabilizes, and the adjustment member 233 is deactivated. Under the influence of its own weight, the floating ring 232 and the fixed ring 231 mate with each other, thus forming a complete "binder ring 23."

[0052] It is worth noting that a correction mechanism is provided on the floating ring 232, which realizes precise positioning and error correction of the plate through various forms (locating pins, positioning blocks, guide plates, etc.). Its advantage is to improve the forming accuracy, stability and production efficiency. In actual application, the appropriate mechanism type can be selected according to the characteristics of the plate, part requirements and production mode, and take into account accuracy, flexibility and automation adaptability.

[0053] The operator activates the drive unit 11 within the frame 1, which moves the die 21 vertically downward along the guide rod until the lower pressing surface of the die 21 contacts the upper surface of the sheet to be drawn. At this point, the abutment on the outside of the die 21 contacts the complete "pressing ring 23" formed by the floating ring 232 and the fixed ring 231. As the drive unit 11 continues to push the die 21 downward, the presser ring 23 compresses the elastic mechanism below it and continues to move downward until the punch 22 and die 21 are fully engaged, thereby achieving sheet drawing. After drawing is complete, the drive unit 11 drives the die 21 upward, allowing the die 21 and punch 22 to separate, and the drawn sheet can then be removed.

[0054] Gap adjustment process:

[0055] When the thickness of the plate increases, that is, the weight of the plate itself increases, as the external feeding unit moves the plate into the mold part 2, when the plate contacts the upper pressure plate 2323 of the floating ring 232, the plate will move downward along the slot 2322 under the cooperation of its own gravity, so that the inclined surface at the edge of the pressure plate 2323 will squeeze the inclined surface of the wedge block 2332. According to the principle of force decomposition, the downward force of the pressure plate 2323 can be decomposed into two components, one perpendicular to the inclined surface and the other parallel to the inclined surface. The component perpendicular to the inclined surface generates pressure between the pressure plate 2323 and the wedge block 2332 to ensure that the inclined surfaces fit each other, while the component parallel to the inclined surface will push the wedge block 2332 to move along the inclined surface direction. Since the wedge block 2332 slides in the slide groove 2331, the downward movement of the pressure plate 2323 will cause the wedge block 2332 to produce a horizontal displacement along the direction of the slide groove 2331.

[0056] It is worth noting that the bevel angle of the pressing plate 2323 and the wedge block 2332 should be set between 45 degrees and 60 degrees. If the angle is too large (such as close to 90 degrees), the bevel will be almost horizontal, and the pressing plate 2323 will easily get stuck due to the shift of the center of gravity when moving downward. If the angle is too small (such as close to 0 degrees), the meaning of the bevel mechanism is lost. The larger the bevel angle (such as close to 60 degrees), the greater the displacement under the same vertical stroke, which is suitable for "short stroke and large displacement". Balls, rollers, etc. can also be added to the bevel to convert the sliding friction between the bevels into rolling friction, thereby reducing the friction between the two, which is conducive to increasing the smoothness of its movement.

[0057] Since the sheet material needs to undergo plastic deformation between the die 21 and the pressure ring 23 during the drawing process, an appropriate gap can allow the material to flow smoothly and avoid rupture due to excessive extrusion. When the wedge block 2332 moves along the slide groove 2331 (moves to the side away from the pressure plate 2323), the connecting rod 2336 at the end of the wedge block 2332 cooperates with the fixed shaft 2337 inside it to form a "lever", and then the end of the connecting rod 2336 away from the wedge block 2332 will push the abutment block 2335 to move along the sliding groove 2334 toward the side close to the pressure plate 2323. As the abutment block 2335 moves along the "channel" formed by the sliding groove 2334 and the movable groove, the inclined surface of the abutment block 2335 will contact the inclined surface in the "channel". The floating ring 232 and the fixed ring 231 will be "stretched open", so that the floating ring 232 can drive the plate to move upward for a short distance. In this process, the floating ring 232 moves upward, so that the initial gap between the die 21 and the pressure ring 23 is automatically adjusted as the thickness of the plate changes. Through mechanical linkage, the gap adjustment amount is linearly related to the change in plate thickness (determined by the bevel angle and the lever transmission ratio), ensuring that the gap is always equal to or slightly larger than the plate thickness, maintaining the optimal pressure state (the die 21 is driven by the drive unit 11, and usually the initial position of the die 21 is fixed, so it is mainly achieved by adjusting the height of the pressure ring 23), avoiding overpressure or underpressure during plate drawing due to gap fixation, thereby affecting the drawing quality of the plate.

[0058] When the distance between the floating ring 232 and the fixed ring 231 is adjusted, the plate, the floating ring 232, the fixed ring 231 and the adjusting member 233 will form a stable "whole", and the die 21 will move vertically downward with the cooperation of the driving unit 11 until it is closed with the punch 22, thereby completing the drawing of the plate.

[0059] It is worth noting that the position of the fixed shaft 2337 is the position of the rotation fulcrum of the "lever". According to the principle of lever, when force needs to be applied to one end of the "lever" and a larger force is generated at the other end, the fulcrum should be set at a position close to the resistance point (that is, the end that needs to generate a larger force), that is, the power arm must be larger than the resistance arm, and then the fixed shaft 2337 should be set at a position close to the abutment block 2335, so that the connecting rod 2336 can rotate around the fixed shaft 2337 as the center, and utilize the force-saving characteristics of the "lever" (the power arm is larger than the resistance arm), so that the wedge block 2332 can push the abutment block 2335 along the "channel" with less power.

[0060] Plate calibration process:

[0061] When the thickness of the plate increases and the plate drives the pressing plate 2323 downward under the cooperation of its own gravity, the wedge block 2332 will move along the "channel" formed by the sliding groove 2334 and the movable groove in cooperation with the connecting rod 2336. At this time, the L-shaped correction plate 2338 will move synchronously with the abutment block 2335 (the L-shaped correction plate 2338 slightly extends out of the guide hole, and a corresponding groove is provided at the bottom of the die 21, which can avoid the L-shaped correction plate 2338 interfering with the die 21 and the punch 22 when the die is closed, thereby affecting the die closing accuracy). When the curved surface of the L-shaped correction plate 2338 contacts and fits with the side wall of the plate, the magnetic part 2339 provided inside the L-shaped correction plate 2338 will be adsorbed with the inner wall of the guide hole, so that when the abutment block 2335 continues to move, the L-shaped correction plate 2338 will not move synchronously with it, thereby avoiding excessive clamping force between the L-shaped correction plates 2338, which will cause deformation of the plate and affect the subsequent drawing quality.

[0062] The L-shaped correction plate 2338 features an arc-shaped contact surface (made of elastic material) with the panel. This arc-shaped contact surface increases the contact area and optimizes pressure distribution, avoiding the stress concentration at the edges that can occur with flat contact. This prevents scratches, indentations, or plastic deformation of the panel sidewalls due to localized high pressure. The arc-shaped design better matches the curvature of the panel sidewall, achieving uniform contact across the entire arc surface. Compared to flat contact, it provides more stable support and allows the panel to maintain effective contact even at slight angles or curvature fluctuations. The arc-shaped contact surface also has no sharp edges, which reduces stress concentration on the correction plate itself, minimizing the risk of wear and fatigue fracture during long-term use and extending the life of the mold.

[0063] It is worth noting that as the weight of the panel increases, the L-shaped correction plate 2338 moves toward and contacts its side wall synchronously, which can offset the panel deviation caused by weight changes in real time, ensure that the panel maintains a stable center position during the processing process, and avoid molding accuracy errors caused by position deviations. The symmetrically arranged L-shaped correction plates 2338 apply supporting force from both sides synchronously, which can balance the asymmetric load generated by the panel's own weight, and avoid local deformation or mold wear caused by unilateral force.

[0064] The present invention uses the adjusting member 233 and the floating ring 232, which has the following advantages:

[0065] Advantage 1: Traditional gap adjustment usually relies on manual measurement of plate thickness and manual adjustment of mold gap, which is inefficient and susceptible to human error. This solution uses the mechanical linkage of wedge block 2332, "lever", and inclined plane to automatically trigger gap adjustment according to changes in plate thickness. The entire process does not require shutdown or manual intervention, significantly improving the degree of production automation and adjustment efficiency.

[0066] Advantage 2: The adjustment part 233 drives the pressing plate 2323 downward according to the change of the plate's own gravity, and the inclined force pushes the wedge block 2332 to move horizontally. The displacement is amplified through the lever principle (the fixed shaft 2337 is close to the abutment block 2335, and the power arm is greater than the resistance arm), and the floating ring 232 and the fixed ring 231 are stretched apart, so that the gap can change linearly with the change of the plate thickness, ensuring that the plate flows evenly during plastic deformation and maintaining the optimal pressing state.

[0067] Advantage three: when the thickness of the plate increases and it sinks due to its own weight, the L-shaped correction plates 2338 on both sides move toward the center and contact synchronously, offsetting the tilting tendency of the plate due to the shift of the center of gravity. In addition, the L-shaped correction plates are symmetrically set, and supporting force is applied synchronously from both sides of the plate, which can effectively balance the unilateral load caused by the change in the self-weight of the plate, avoid local deformation caused by unilateral force, and help extend the service life of the mold.

[0068] Advantage four: as the thickness of the plate increases (its own weight increases), the pressing plate 2323 drives the wedge block 2332, the connecting rod 2336, and the abutment block 2335 to drive the L-shaped correction plate to move dynamically, and correct the position of the plate in real time. Each correction of the plate is always before the gap adjustment of the floating ring 232 and the fixed ring 231. The pre-correction can ensure that the plate maintains a stable centered position during the processing process, avoids the molding accuracy error caused by position deviation, eliminates the positioning deviation caused by the self-weight of the plate, and avoids the molding size error caused by position offset from the source.

[0069] Advantage five: When the L-shaped correction plate fits against the side wall of the plate, the internal magnetic part 2339 is adsorbed against the inner wall of the guide hole, causing the correction plate to stop moving, avoiding the abutment block 2335 from continuously pushing and causing excessive clamping force. The correction force can be controlled in real time to prevent the plate from being deformed due to excessive clamping, ensuring that the correction process is stable and does not damage the plate, providing a reliable initial position for subsequent drawing.

[0070] Advantage six: The contact position between the L-shaped correction plate 2338 and the side wall of the plate adopts an arc-shaped design. The arc-shaped contact surface avoids the edge stress concentration that may be caused by plane contact by increasing the contact area and optimizing the pressure distribution, preventing the side wall of the plate from being scratched, indented or plastically deformed due to local high pressure. The edge of the arc-shaped contact surface has no sharp edges, which can reduce the stress concentration of the correction plate itself and reduce the risk of wear or fatigue fracture during long-term use.

[0071] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A sheet metal forming drawing die based on an adaptive gap adjustment structure, characterized in that: include: Rack (1); A mold part (2), the mold part (2) includes a die (21) and a punch (22), the die (21) is slidably connected to the frame (1) via a guide column arranged at the top thereof, the punch (22) is detachably mounted inside the frame (1), the punch (22) is arranged directly below the die (21), and a pressing ring (23) is provided at the top of the punch (22); The pressing ring (23) includes a fixed ring (231) and a floating ring (232), wherein the floating ring (232) is slidably connected to the fixed ring (231) through a sliding hole provided on the outside, and an adjusting member (233) is provided on the top of the floating ring (232) for adjusting the distance between the fixed ring (231) and the floating ring (232); When the weight of the plate increases, the adjusting member (233) can drive the floating ring (232) to move relative to the fixed ring (231) when the adjusting member (233) is opened, thereby increasing the distance between the floating ring (232) and the fixed ring (231); The adjusting member (233) includes a slide groove (2331) provided on the top of the floating ring (232), and the slide groove (2331) is provided with two slide grooves and is symmetrically distributed along the center of the floating ring (232). A wedge block (2332) is slidably connected in the slide groove (2331) and is in contact with the inclined surface of the pressing plate (2323). The floating ring (232) has two movable cavities (2333) on both sides of its side wall, and the movable cavities (2333) are provided with two movable cavities (2333) and are symmetrically distributed along the sliding groove (2331). The movable cavity (2333) includes a movable groove and a guide hole that are interconnected. The fixed ring (231) has two sliding grooves (2334) on both sides of its side wall, and the sliding grooves (2334) are located directly below the movable cavity (2333). The adjacent side walls of the movable groove and the sliding groove (2334) are Both are provided with inclined surfaces, and an abutment block (2335) that fits the inner wall of the movable groove is slidably connected in the sliding groove (2334), and the abutment block (2335) is designed with an inclined surface close to the pressing plate (2323). The abutment block (2335) is connected to the end of the wedge block (2332) through a connecting rod (2336) provided at its end, and a fixed shaft (2337) that is rotatably connected to the inside of the connecting rod (2336) is fixedly connected to the middle part of the side wall of the fixed ring (231).

2. The sheet metal forming drawing die based on the adaptive gap adjustment structure according to claim 1, characterized in that: It also includes a driving unit (11) fixedly connected to the inside of the frame (1), and the output end of the driving unit (11) is connected to the top of the die (21).

3. The sheet metal forming drawing die based on the adaptive gap adjustment structure according to claim 1, characterized in that: The floating ring (232) is connected to the top of the fixed ring (231) through an elastic member (2321) arranged at the bottom thereof. A plurality of elastic members (2321) are provided and distributed in an array along the center of the floating ring (232). The bottom of the fixed ring (231) is connected to the top of the punch (22) through an elastic mechanism.

4. The sheet metal forming drawing die based on the adaptive gap adjustment structure according to claim 1, characterized in that: The floating ring (232) is slidably connected to a pressing plate (2323) that fits the pressing surface at the bottom of the die (21) via a notch (2322) provided at the top thereof, and the bottom of the pressing plate (2323) is connected to the inner wall of the notch (2322) via a round wire spring (2324). The round wire springs (2324) are provided in plurality and are distributed in an array along the pressing plate (2323), and the bottom edge of the pressing plate (2323) is designed to be inclined.

5. The sheet metal forming drawing die based on the adaptive gap adjustment structure according to claim 1, characterized in that: The abutment block (2335) is slidably connected to an L-shaped correction plate (2338) that fits the inner wall of the guide hole through an open groove provided on its top. A return spring connected to the outer side of the L-shaped correction plate (2338) is provided in the open groove. A magnetic part (2339) is fixedly connected to the inside of the L-shaped correction plate (2338). The inner wall of the guide hole and the magnetic part (2339) are connected by magnetic force. The end of the L-shaped correction plate (2338) is designed to be arc-shaped.

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