Plate forming drawing die based on self-adaptive gap adjusting structure

Abstract

The invention relates to the technical field of drawing dies, and discloses a plate forming drawing die based on a self-adaptive gap adjusting structure. The die part comprises a female die and a male die, the female die is slidably connected into the rack through a guide column arranged at the top of the female die, the male die is arranged under the female die, and a material pressing ring is arranged at the top of the male die; wherein the material pressing ring comprises a fixed ring and a floating ring, and an adjusting piece used for adjusting the distance between the fixed ring and the floating ring is arranged at the top of the floating ring. The plate forming drawing die based on the self-adaptive gap adjusting structure can effectively solve the problems that in the prior art, a traditional drawing die is only matched with a plate with the specific thickness, when plates with other thicknesses are machined, manual gap adjustment is often needed for adaptation, the adjustment mode is low in efficiency, the precision of the gap is difficult to guarantee, and the machining cost is high. And as the gap is not matched with the plate, the defects of cracking, wrinkling and the like of the plate during drawing are caused.

Description

Technical Field

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

[0002] A drawing die is a core element of the drawing process. With the significant advantages of fast forming speed and stable product quality, it is suitable for large-scale production scenarios. A drawing die mainly consists of a female die, a blank holder, and a male die. When the male die and the female die are closed, it can cause the sheet metal to undergo plastic deformation under the interaction of the male die and the female die, and finally form a drawing part shape that meets the requirements.

[0003] In a drawing die, the gap parameter between the blank holder and the female die directly determines the flow characteristics and deformation behavior of the sheet metal during the forming process. Since traditional drawing dies are only adapted to sheet metals of specific thicknesses, when processing sheet metals 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 mismatch between the gap and the sheet metal will cause defects such as cracking and wrinkling of the sheet metal during drawing, and it is necessary to repeatedly repair the die later or even cause the drawing part to be scrapped, which has a double negative impact on production efficiency and manufacturing cost. Summary of the Invention

[0004] Aiming at the above-mentioned shortcomings of the prior art, the present invention provides a sheet metal forming drawing die based on an adaptive gap adjustment structure, which can effectively solve the problems in the prior art that traditional drawing dies are only adapted to sheet metals of specific thicknesses, and when processing sheet metals 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 mismatch between the gap and the sheet metal will cause defects such as cracking and wrinkling of the sheet metal during drawing.

[0005] To achieve the above object, the present invention is realized through the following technical solutions: The present invention provides a sheet metal forming drawing die based on an adaptive gap adjustment structure, including: A frame; A die part, the die part includes a female die and a male die. The female die is slidably connected in the frame through a guide post provided on its top. The male die is detachably installed inside the frame, and the male die is arranged directly below the female die. A blank holder is provided on the top of the male die; Among them, the blank holder includes a fixed ring and a floating ring. The floating ring is slidably connected in the fixed ring through a slide hole provided on the outside. An adjusting member for adjusting the distance between the fixed ring and the floating ring is provided on the top of the floating ring; Among them, as the self - weight of the plate increases, when the adjusting member is opened, it can drive the floating ring to move relative to the fixed ring to increase the distance between the floating ring and the fixed ring.

[0006] Furthermore, it further includes a driving unit fixedly connected inside the frame, and the output end of this driving unit is connected to the top of the female mold.

[0007] Furthermore, the floating ring is connected to the top of the fixed ring through elastic members arranged at its bottom. There are multiple elastic members and they are distributed in an array along the center of the floating ring. The bottom of the fixed ring is connected to the top of the male mold through an elastic mechanism.

[0008] Furthermore, a pressure plate that fits against the pressure surface at the bottom of the female mold is slidably connected to the floating ring through a notch opened at its top. And the bottom of this pressure plate is connected to the inner wall of the notch through circular wire springs. There are multiple circular wire springs and they are distributed in an array along the pressure plate. The bottom edge of the pressure plate is designed as an inclined surface.

[0009] Furthermore, the adjusting member includes chutes opened at the top of the floating ring. There are two chutes and they are symmetrically distributed left and right along the center of the floating ring. A wedge block that fits against the inclined surface of the pressure plate is slidably connected in the chutes; Activity cavities are opened on both sides of the side wall of the floating ring. There are two activity cavities and they are symmetrically distributed left and right along the chutes. The activity cavity includes an activity slot and a guiding hole that communicate with each other. Sliding slots are opened on both sides of the side wall of the fixed ring, and this sliding slot is located directly below the activity cavity. Inclined surfaces are provided on the adjacent side walls of the activity slot and the sliding slot.

[0010] Furthermore, an abutting block that fits against the inner wall of the activity slot is slidably connected in the sliding slot. And the side of the abutting block close to the pressure plate is designed as an inclined surface. The abutting block is connected to the end of the wedge block through a connecting rod arranged at its end. A fixed shaft that is rotatably connected inside the connecting rod is fixedly connected to the middle of the side wall of the fixed ring.

[0011] Furthermore, an L - shaped correction plate that fits against the inner wall of the guiding hole is slidably connected to the abutting block through an opening groove opened at its top. A return spring connected to the outside of the L - shaped correction plate is arranged in the opening groove. A magnetic member is fixedly connected inside the L - shaped correction plate. The inner wall of the guiding hole and the magnetic member are connected by magnetic force. The end of the L - shaped correction plate is designed as a circular arc.

[0012] The technical solution provided by the present invention has the following beneficial effects compared with the prior art: The present invention is provided with an adjusting member and a blank holding ring. Through the mechanical linkage between the wedge block and the connecting rod in the adjusting member, forming a "lever" and an inclined plane, the gap adjustment can be automatically triggered according to the change in the thickness of the plate member. The whole process does not require shutdown or manual intervention, significantly improving the production automation level and adjustment efficiency. The adjusting member drives the blank holding plate to move downward according to the change in the self-weight of the plate member. The component force of the inclined plane pushes the wedge block to move horizontally, and the displacement is amplified through the lever principle (the fixed shaft is close to the abutting block, and the power arm is greater than the resistance arm), expanding the floating ring and the fixed ring, so that the gap can change linearly with the change in the thickness of the plate member, ensuring uniform flow of the plate member during plastic deformation and maintaining the best blank holding state. Moreover, when the thickness of the plate member increases and it sinks, the two L-shaped correction plates move synchronously towards the center and contact each other, offsetting the inclination trend generated by the center-of-gravity shift of the plate member. And the L-shaped correction plates are symmetrically arranged, applying support forces synchronously from both sides of the plate member, which can effectively balance the unilateral load caused by the change in the self-weight of the plate member, avoid local deformation caused by unilateral force, and is beneficial to extending the service life of the mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0014] Figure 1 It is a front view structural schematic diagram of an embodiment of the present invention; Figure 2 It is a three-dimensional separated structural schematic diagram of a punch in an embodiment of the present invention; Figure 3 It is a three-dimensional separated structural schematic diagram of a die in an embodiment of the present invention; Figure 4 It is a structural schematic diagram of the three-dimensional state transformation of a punch and a die in an embodiment of the present invention; Figure 5 It is a three-dimensional separated structural schematic diagram of a blank holding ring in an embodiment of the present invention; Figure 6 It is a sectional structural schematic diagram of a fixed ring and a floating ring in an embodiment of the present invention; Figure 7 For an embodiment of the present invention Figure 6 The enlarged schematic diagram of the structure at A in Figure 8 It is a three-dimensional separated structural schematic diagram of a blank holding ring and an adjusting member in an embodiment of the present invention; Figure 9 For an embodiment of the present invention Figure 8 The enlarged schematic diagram of the structure at B in

[0015] The reference numerals in the figure respectively represent: 1. Frame; 11. Driving unit; 2. Die part; 21. Female die; 22. Male die; 23. Blank holder; 231. Fixed ring; 232. Floating ring; 2321. Elastic member; 2322. Notch; 2323. Blank holder plate; 2324. Round wire spring; 233. Adjusting member; 2331. Slide groove; 2332. Wedge block; 2333. Activity cavity; 2334. Slide slot; 2335. Contact block; 2336. Connecting rod; 2337. Fixed shaft; 2338. L-shaped correction plate; 2339. Magnetic member. Specific embodiments

[0016] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0017] The present invention will be further described below with reference to the embodiments.

[0018] Embodiment:

[0019] Please refer to Figures 1-9 , the present invention provides a technical solution: a sheet metal forming drawing die based on an adaptive gap adjustment structure, including: The present invention provides a sheet metal forming drawing die based on an adaptive gap adjustment structure, including: Frame 1; Die part 2, the die part 2 includes a female die 21 and a male die 22. The female die 21 is slidably connected in the frame 1 through a guide post provided on its top. The male die 22 is detachably installed inside the frame 1. The male die 22 is arranged directly below the female die 21, and a blank holder 23 is provided on the top of the male die 22; Among them, the blank holder 23 includes a fixed ring 231 and a floating ring 232. The floating ring 232 is slidably connected in the fixed ring 231 through a slide hole provided on the outside. An adjusting member 233 for adjusting the distance between the fixed ring 231 and the floating ring 232 is provided on the top of the floating ring 232; Among them, as the self-weight of the sheet metal increases, when the adjusting member 233 is opened, it can drive the floating ring 232 to move relative to the fixed ring 231 to increase the distance between the floating ring 232 and the fixed ring 231.

[0020] It further includes a driving unit 11 fixedly connected inside the frame 1, and the output end of the driving unit 11 is connected to the top of the female die 21.

[0021] The floating ring 232 is connected to the top of the fixed ring 231 through elastic members 2321 provided at its bottom. A plurality of elastic members 2321 are provided and are 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.

[0022] The floating ring 232 is slidably connected through a notch 2322 opened at its top with a pressure plate 2323 that fits against the blank holding surface at the bottom of the female die 21. And the bottom of the pressure plate 2323 is connected to the inner wall of the notch 2322 through a round wire spring 2324. A plurality of round wire springs 2324 are provided and are distributed in an array along the pressure plate 2323. The bottom edge of the pressure plate 2323 is designed with an inclined surface.

[0023] The adjusting member 233 includes sliding grooves 2331 opened at the top of the floating ring 232. And two sliding grooves 2331 are provided and are symmetrically distributed left and right along the center of the floating ring 232. A wedge block 2332 that fits against the inclined surface of the pressure plate 2323 is slidably connected in the sliding grooves 2331; Activity cavities 2333 are opened on both sides of the side wall of the floating ring 232. And two activity cavities 2333 are provided and are symmetrically distributed left and right along the sliding grooves 2331. The activity cavity 2333 includes a mutually connected activity groove and a guiding hole. Sliding grooves 2334 are opened on both sides of the side wall of the fixed ring 231. And the sliding grooves 2334 are located directly below the activity cavities 2333. Inclined surfaces are provided on the adjacent side walls of the activity groove and the sliding grooves 2334.

[0024] An abutting block 2335 that fits against the inner wall of the activity groove is slidably connected in the sliding grooves 2334. And the side of the abutting block 2335 close to the pressure plate 2323 is designed with an inclined surface. The abutting block 2335 is connected to the end of the wedge block 2332 through a connecting rod 2336 provided at its end. A fixed shaft 2337 that is rotatably connected inside the connecting rod 2336 is fixedly connected to the middle of the side wall of the fixed ring 231.

[0025] An L-shaped correction plate 2338 that fits against the inner wall of the guiding hole is slidably connected to the abutting block 2335 through an opening groove opened at its top. A return spring connected to the outer side of the L-shaped correction plate 2338 is provided in the opening groove. A magnetic member 2339 is fixedly connected inside the L-shaped correction plate 2338. The inner wall of the guiding hole and the magnetic member 2339 are connected by magnetic force. The end of the L-shaped correction plate 2338 is designed with a circular arc.

[0026] The working principle and advantages of the sheet metal forming drawing die based on the adaptive gap adjustment structure: Sheet metal drawing preparation stage: During actual use, the operator inspects the relevant states of the female die 21 and the male die 22 in the die section 2. For example, the operator checks whether there are defects such as cracks, wear, scratches, depressions, or oxidation and rust on the working surfaces of the female die 21 and the male die 22, and confirms whether the die edge (such as the blank holder and the entrance of the female die 21) is sharp without chipping or notching, so as to avoid scratching or tearing the surface of the sheet metal during drawing, which may affect the drawing effect of the sheet metal.

[0027] Sheet metal drawing stage: After the inspection of the die section 2 is completed, the operator uses an external feeding unit (such as a servo feeder, an automatic feeding line, a robot feeding system, etc.) to place the sheet metal to be drawn on 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, the sheet metal to be drawn will first come into contact with the blank holder 2323. If the sheet metal to be drawn is of standard thickness, at this time, the blank holder 2323 will cooperate with the round wire spring 2324 below it to be in a stable state, the adjusting part 233 will not be activated, and under the action of its own gravity, the floating ring 232 and the fixed ring 231 will fit together to form a complete "blank holder 23".

[0028] It should be noted that a calibration mechanism is provided on the floating ring 232 to achieve precise positioning and error correction of the sheet metal through various forms (such as positioning pins, positioning blocks, guide plates, etc.). Its advantages are to improve the forming accuracy, stability, and production efficiency. In actual applications, the appropriate mechanism type can be selected according to the characteristics of the sheet metal, part requirements, and production mode, taking into account accuracy, flexibility, and automation adaptability.

[0029] The operator starts the driving unit 11 in the frame 1, and the driving unit 11 will move the female die 21 vertically downward along the guide rod until the blank holding surface at the lower part of the female die 21 comes into contact with the upper surface of the sheet metal to be drawn. At this time, the abutting part outside the female die 21 will come into contact with the complete "blank holder 23" formed by the floating ring 232 and the fixed ring 231. As the driving unit 11 continues to push the female die 21 downward, at this time, the blank holder 23 will compress the elastic mechanism below it and continue to move downward until the male die 22 and the female die 21 are closed, thereby realizing the drawing of the sheet metal. After the drawing is completed, the driving unit 11 drives the female die 21 to move upward. At this time, the female die 21 and the male die 22 can be separated from each other, and then the drawn sheet metal can be removed.

[0030] Clearance adjustment process: When the thickness of the plate increases, that is, the self-weight of the plate increases. As the external feeding unit moves the plate into the die part 2, when the plate comes into contact with the upper pressure plate 2323 of the floating ring 232, with the cooperation of its own gravity, the plate will move downward along the notch 2322. As a result, the inclined surface at the edge of the pressure plate 2323 will exert pressure on the inclined surface of the wedge 2332. According to the principle of force decomposition, the downward force of the pressure plate 2323 can be decomposed into two component forces perpendicular and parallel to the inclined surface. The component force perpendicular to the inclined surface generates pressure between the pressure plate 2323 and the wedge 2332, ensuring that the inclined surfaces fit together, while the component force parallel to the inclined surface will push the wedge 2332 to move along the inclined surface direction. Since the wedge 2332 slides in the chute 2331, when the pressure plate 2323 moves downward, it will cause the wedge 2332 to have a horizontal displacement along the direction of the chute 2331.

[0031] It should be noted that the inclined surface angles of the pressure plate 2323 and the wedge 2332 should be set between 45 degrees and 60 degrees. If the angle is too large (such as approaching 90 degrees), the inclined surface will be almost horizontal, and when the pressure plate 2323 moves downward, it is easy to get stuck due to the center of gravity offset. If the angle is too small (such as approaching 0 degrees), the meaning of the inclined surface mechanism is lost. The larger the inclined surface angle (such as approaching 60 degrees), the greater the displacement under the same vertical stroke, which is suitable for "short stroke and large displacement". In addition, balls, rollers, etc. can be added to the inclined surface, which can convert the sliding friction between the inclined surfaces into rolling friction, thereby reducing the friction between the two and being beneficial to increasing the smoothness of their movement.

[0032] 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 thickness change of the plate (determined by the bevel angle and the lever transmission ratio), ensuring that the gap is always equal to or slightly larger than the thickness of the plate, maintaining the best 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.

[0033] 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.

[0034] It is worth mentioning 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 thus the fixed shaft 2337 should be set close to the abutment block 2335, so that the connecting rod 2336 can rotate around the fixed shaft 2337, and utilize the labor-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.

[0035] Plate calibration process: When the thickness of the plate increases and the plate drives the pressure plate 2323 to move 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 under the cooperation of the connecting rod 2336. At this time, the L-shaped correction plate 2338 will move synchronously with the abutting block 2335 (the L-shaped correction plate 2338 slightly protrudes from the guiding hole, and a corresponding groove is provided at the bottom of the female die 21, which can prevent the L-shaped correction plate 2338 from interfering with it when the female die 21 and the male die 22 are closed, affecting the closing accuracy). When the arc surface of the L-shaped correction plate 2338 comes into contact with and fits the side wall of the plate, the magnetic part 2339 arranged inside the L-shaped correction plate 2338 will adsorb with the inner wall of the guiding hole, so that when the abutting block 2335 continues to move, the L-shaped correction plate 2338 will not move synchronously with it, avoiding excessive clamping force between the L-shaped correction plates 2338, resulting in deformation of the plate and affecting the subsequent drawing quality.

[0036] The contact surface between the L-shaped correction plate 2338 and the plate is set to be arc-shaped (made of elastic material). The arc-shaped contact surface increases the contact area and optimizes the pressure distribution, avoiding the edge stress concentration that may occur in plane contact, and preventing scratches, indentations or plastic deformation on the side wall of the plate due to local high pressure. The arc-shaped design can better match the curvature of the side wall of the plate, achieve uniform contact of the entire arc surface, provide a more stable supporting force compared with plane contact, and allow the plate to still maintain effective contact when there are small-angle or curvature fluctuations, and there are no sharp edges at the edge of the arc-shaped contact surface, which can reduce the stress concentration of the correction plate itself, reduce the risk of wear or fatigue fracture during long-term use, and extend the service life of the mold.

[0037] It should be noted that as the weight of the plate increases, the L-shaped correction plate 2338 moves synchronously towards its side wall and contacts it, which can offset the offset of the plate caused by the weight change in real time, ensure that the plate maintains a stable centered position during the processing, avoid the forming accuracy error caused by the position deviation, and the symmetrically arranged L-shaped correction plates 2338 apply supporting forces synchronously from both sides, which can balance the asymmetric load generated by the self-weight of the plate and avoid local deformation or mold wear caused by unilateral force.

[0038] The present invention adopts the adjusting part 233 and the floating ring 232, which has the following advantages: Advantage 1: Traditional gap adjustment usually relies on manual measurement of the plate thickness and then manual adjustment of the mold gap, which is inefficient and vulnerable to human errors. In this solution, through the mechanical linkage of the wedge block 2332, the "lever" and the inclined plane, the gap adjustment can be automatically triggered according to the change of the plate thickness. The whole process does not require shutdown or manual intervention, significantly improving the production automation degree and adjustment efficiency.

[0039] Advantage two: The adjusting member 233 drives the blank holder 2323 to move downward according to the change of the self - weight of the plate member. The component force on the inclined plane pushes the wedge block 2332 to move horizontally. Through the lever principle (the fixed shaft 2337 is close to the abutting block 2335, and the power arm is greater than the resistance arm), the displacement is amplified, and the floating ring 232 and the fixed ring 231 are expanded, so that the gap can change linearly with the change of the plate member thickness, ensuring uniform flow of the plate member during plastic deformation and maintaining the best blank holding state.

[0040] Advantage three: When the thickness of the plate member increases and it sinks due to its own weight, the two L - shaped correction plates 2338 move synchronously towards the center and come into contact, offsetting the inclination trend caused by the center - of - gravity offset of the plate member. Moreover, the L - shaped correction plates are symmetrically arranged, applying support forces synchronously from both sides of the plate member, which can effectively balance the unilateral load caused by the change of the plate member's self - weight, avoid local deformation caused by unilateral stress, and is beneficial to extending the service life of the mold.

[0041] Advantage four: As the thickness of the plate member increases (the self - weight increases), the blank holder 2323 drives the wedge block 2332, the connecting rod 2336, and the abutting block 2335 to drive the dynamic movement of the L - shaped correction plate, real - time correcting the position of the plate member. And each correction of the plate member is always before the gap adjustment between the floating ring 232 and the fixed ring 231. The correction in advance can ensure that the plate member maintains a stable centered position during the processing, avoid forming precision errors caused by position deviation, eliminate the positioning deviation caused by the self - weight of the plate member, and avoid forming size errors caused by position offset from the source.

[0042] Advantage five: When the L - shaped correction plate fits with the side wall of the plate member, the internal magnetic member 2339 adsorbs to the inner wall of the guiding hole, stopping the movement of the correction plate, avoiding excessive clamping force caused by the continuous pushing of the abutting block 2335, being able to control the correction force in real - time, preventing the deformation of the plate member due to excessive clamping, ensuring that the correction process is both stable and does not damage the plate member, and providing a reliable initial position for the subsequent drawing.

[0043] Advantage six: The contact position between the L - shaped correction plate 2338 and the side wall of the plate member is designed with an arc. The arc - shaped contact surface increases the contact area and optimizes the pressure distribution, avoiding the edge stress concentration that may occur in plane contact, preventing scratches, indentations or plastic deformation on the side wall of the plate member due to local high pressure. Moreover, the edge of the arc - shaped contact surface has no sharp corners, which can reduce the stress concentration of the correction plate itself and reduce the risk of wear or fatigue fracture during long - term use.

[0044] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements will not make the essence of the corresponding technical solutions deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A drawing die for sheet metal forming based on an adaptive gap adjustment structure, characterized in that Comprising: A frame (1); A die part (2), the die part (2) includes a female die (21) and a male die (22), the female die (21) is slidably connected within the frame (1) through guide posts provided at its top, the male die (22) is detachably installed inside the frame (1), the male die (22) is disposed directly below the female die (21), and a blank holder (23) is provided at the top of the male die (22); Wherein, the blank holder (23) includes a fixed ring (231) and a floating ring (232), the floating ring (232) is slidably connected within the fixed ring (231) through sliding holes provided on the outside, and an adjusting member (233) for adjusting the distance between the fixed ring (231) and the floating ring (232) is provided at the top of the floating ring (232); Wherein, as the self - weight of the sheet increases, when the adjusting member (233) is opened, it can drive the floating ring (232) to move relative to the fixed ring (231) to increase the distance between the floating ring (232) and the fixed ring (231).

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

3. A panel forming drawing die based on an 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 elastic members (2321) provided at its bottom, a plurality of the elastic members (2321) are provided and are distributed in an array along the center of the floating ring (232), and the bottom of the fixed ring (231) is connected to the top of the male die (22) through an elastic mechanism.

4. A panel forming drawing die based on an adaptive gap adjustment structure according to claim 1, characterized in that: The floating ring (232) is slidably connected with a blank holding plate (2323) that fits against the blank holding surface at the bottom of the female die (21) through a notch (2322) opened at its top, and the bottom of this blank holding plate (2323) is connected to the inner wall of the notch (2322) through round wire springs (2324), a plurality of the round wire springs (2324) are provided and are distributed in an array along the blank holding plate (2323), and the bottom edge of the blank holding plate (2323) is designed with an inclined surface.

5. A panel forming drawing die based on an adaptive gap adjustment structure according to claim 1, characterized in that: The adjusting member (233) includes sliding grooves (2331) opened at the top of the floating ring (232), two of these sliding grooves (2331) are provided and are symmetrically distributed left and right along the center of the floating ring (232), and wedges (2332) that fit against the inclined surface of the blank holding plate (2323) are slidably connected within the sliding grooves (2331); Activity cavities (2333) are opened on both sides of the side wall of the floating ring (232), two of these activity cavities (2333) are provided and are symmetrically distributed left and right along the sliding grooves (2331), the activity cavities (2333) include an interconnected activity slot and a guide hole, sliding slots (2334) are opened on both sides of the side wall of the fixed ring (231), and these sliding slots (2334) are located directly below the activity cavities (2333), and inclined surfaces are provided on the adjacent side walls of the activity slot and the sliding slots (2334).

6. The sheet metal forming drawing die based on the adaptive gap adjustment structure according to claim 5, wherein: A contact block (2335) that fits against the inner wall of the movable slot is slidably connected in the sliding slot (2334). One side of the contact block (2335) close to the pressure plate (2323) is designed as an inclined surface. The contact block (2335) is connected to the end of the wedge block (2332) through a connecting rod (2336) provided at its end. A fixed shaft (2337) that is rotatably connected inside the connecting rod (2336) is fixedly connected to the middle of the side wall of the fixed ring (231).

7. The drawing die for sheet metal forming based on an adaptive gap adjustment structure according to claim 6, wherein: An L-shaped correction plate (2338) that fits against the inner wall of the guiding hole is slidably connected to the contact block (2335) through an opening groove formed at its top. A return spring connected to the outside of the L-shaped correction plate (2338) is provided in the opening groove. A magnetic member (2339) is fixedly connected inside the L-shaped correction plate (2338). The inner wall of the guiding hole and the magnetic member (2339) are magnetically connected. The end of the L-shaped correction plate (2338) is designed as a circular arc.

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