Die structure

Abstract

The utility model relates to a die structure which comprises an integral driving part, a female die assembly and a male die assembly, and the integral driving part can drive the female die assembly to move relative to the male die assembly. The female die assembly comprises a female die base, a material pressing plate, a crimping sliding block and a first driving piece, and the first driving piece can drive the material pressing plate to move. The male die assembly comprises a male die base, a movable male die, a rotating wedge, a second driving piece and a third driving piece. The second driving piece can drive the movable male die to move relative to the male die base. When the movable male die and the male die base can be arranged in a staggered mode, the machined part can be bent to form a first turned-over edge. The pressing connection sliding block and the rotating wedge can be matched in a pressing connection mode so that the machined part can be bent to form a second turned edge, and the third driving piece can drive the rotating wedge to rotate around the axial direction of the rotating wedge relative to the male die base so that the rotating wedge can be separated from the second turned edge. According to the die structure, the problem that the machining efficiency of a flanging structure is low is solved.

Description

Technical Field

[0001] This application relates to the field of mold equipment technology, and in particular to a mold structure. Background Technology

[0002] In the field of automotive stamping die manufacturing, the angle between the flanging structure (including but not limited to laser-welded side flanging and rear runner flanging) and the main structure is usually an acute angle. Therefore, in order to facilitate the demolding of the flanging structure, the flanging structure needs to be processed in two steps to achieve demolding. That is, it is necessary to first perform vertical pressing and bending and demolding in the vertical direction, and then perform horizontal pressing and bending and demolding in the horizontal direction. This will result in a decrease in processing efficiency and an increase in processing costs, which is not conducive to market competitiveness. Utility Model Content

[0003] Therefore, it is necessary to provide a mold structure to solve the problem that the existing flanging structure requires two processes to form, which leads to a decrease in processing efficiency.

[0004] The mold structure provided in this application includes an integral drive component, a die assembly, and a punch assembly. The integral drive component can drive the die assembly to move relative to the punch assembly along a first direction. The die assembly includes a die base, a pressure plate, a pressing slider, and a first drive component. The first drive component and the pressing slider are both mounted on the die base. The first drive component can drive the pressure plate to move along the first direction. The punch assembly includes a punch base, a movable punch, a rotating wedge, a second drive component, and a third drive component. The rotating wedge, the second drive component, and the third drive component are all mounted on the punch base. The second drive component can drive the movable punch to move relative to the punch base along the first direction. When the pressure plate presses against the movable punch along the first direction and compresses the second drive component, the movable punch and the punch base can be staggered to bend one edge of the processed part to form a first flange. The pressing slider and the rotating wedge can be pressed together to bend the processed part to form a second flange. The third drive component can drive the rotating wedge to rotate relative to the punch base around its own axis to separate the rotating wedge from the second flange.

[0005] In one embodiment, the third driving member includes a driving body and a transmission member. One end of the transmission member is fixedly connected to the rotating wedge, and the other end is hinged to the driving body. The driving body can drive the rotating wedge to rotate through the transmission member.

[0006] In one embodiment, the transmission component includes a drive plate and a rotating shaft. The output end of the drive body is hinged to the rotating shaft, and the rotating shaft is fixedly inserted through the drive plate along the axial direction of the rotating wedge. The end of the drive plate away from the drive body extends along the axial direction of the rotating wedge and is fixedly connected to the rotating wedge.

[0007] In one embodiment, the third driving member further includes a limiting plate, one end of which is fixedly connected to the rotating wedge, and the other end of which extends radially out of the outer peripheral surface of the rotating wedge. When the rotating wedge and the pressing slider are pressed together, the end of the limiting plate extending out of the outer peripheral surface of the rotating wedge can cooperate with the punch seat stop.

[0008] In one embodiment, the outer periphery of the rotating wedge is provided with an installation notch extending along its own axial direction, and a limiting plate is fixedly connected to the inner wall of the installation notch.

[0009] In one embodiment, the circumference of the rotating wedge is provided with a limiting groove extending around its own axial direction, and the punch assembly also includes a limiting block. One end of the limiting block is fixedly connected to the punch seat, and the other end is inserted into the limiting groove along the radial direction of the rotating wedge. The limiting block can respectively stop and cooperate with the inner walls of the limiting groove on both sides of the circumference of the rotating wedge to limit the rotation range of the rotating wedge.

[0010] In one embodiment, there are two limiting grooves, which are distributed at both ends of the rotating wedge along its own axial direction. There are also two limiting blocks, which are respectively limited and engaged with the corresponding limiting grooves.

[0011] In one embodiment, the die assembly further includes a first cutting portion disposed toward the movable punch, the first cutting portion being disposed on the die holder, and the punch assembly further includes a second cutting portion disposed toward the die holder, the second cutting portion being disposed on the punch holder. When the integral drive member drives the die assembly to move toward the direction of the punch assembly, the first cutting portion can engage with the second cutting portion to trim the edge portion of the processed part.

[0012] In one embodiment, the overall drive unit, the first drive unit, the second drive unit, and the third drive unit are all cylinders.

[0013] In one embodiment, the first and second driving elements are nitrogen springs.

[0014] Compared with the prior art, the mold structure provided in this application can simultaneously realize the processing and demolding of the first and second flanging in the same process, which also greatly improves the processing efficiency.

[0015] Furthermore, after the processed part of this application is stamped to form a main body and a second flange arranged at an angle, the rotating wedge can be driven to rotate by a third driving member so that the rotating wedge can disengage from the area between the main body and the second flange, thereby realizing the demolding of the processed part.

[0016] As can be seen from the above, the mold structure of this application only requires one processing step to complete the stamping and demolding of multiple flanges (including the first flange and the second flange) of the processed parts, which greatly improves the processing efficiency and reduces the processing cost. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the mold structure provided in this application;

[0019] Figure 2 A cross-sectional view of a mold structure according to an embodiment provided in this application;

[0020] Figure 3 A partial structural diagram of a mold structure according to an embodiment provided in this application;

[0021] Figure 4 A partial cross-sectional view of a mold structure according to an embodiment provided in this application;

[0022] Figure 5 A partial structural schematic diagram of a punch assembly according to an embodiment provided in this application.

[0023] Reference numerals: 100, die assembly; 110, die base; 120, pressure plate; 130, pressing slider; 140, first driving component; 150, concave surface; 160, first cutting part; 200, punch assembly; 210, punch base; 220, movable punch; 230, rotating wedge; 231, mounting notch; 232, limiting groove; 240, second driving component; 250, third driving component; 251, driving body; 252, transmission component; 2521, driving plate; 2522, rotating shaft; 253, limiting plate; 260, convex surface; 270, second cutting part; 280, limiting block. Detailed Implementation

[0024] In the field of automotive stamping die manufacturing, the angle between the flanging structure (including but not limited to laser-welded side flanging and rear runner flanging) and the main structure is usually an acute angle. Therefore, in order to facilitate the demolding of the flanging structure, the flanging structure needs to be processed in two steps to achieve demolding. That is, it is necessary to first perform vertical pressing and bending and demolding in the vertical direction, and then perform horizontal pressing and bending and demolding in the horizontal direction. This will result in a decrease in processing efficiency and an increase in processing costs, which is not conducive to market competitiveness.

[0025] Please see Figures 1-5 To address the problem that existing flanging structures require two separate processing steps, leading to reduced processing efficiency, this application provides a mold structure. The mold structure includes an integral drive component (not shown), a die assembly 100, and a punch assembly 200. The die assembly 100 is located at the output end of the integral drive component, and the integral drive component can drive the die assembly 100 to move relative to the punch assembly 200 along a first direction (represented by M in the figure).

[0026] It should be noted that the first direction includes, but is not limited to, the vertical direction, the horizontal direction, or other directions.

[0027] The die assembly 100 includes a die base 110, a pressure plate 120, a pressing slider 130, and a first drive member 140. The die assembly 100 has a concave surface 150, on which the workpiece is placed. The first drive member 140 and the pressing slider 130 are both mounted on the die base 110. The pressure plate 120 is connected to the output end of the first drive member 140, and the first drive member 140 can drive the pressure plate 120 to move along a first direction.

[0028] The punch assembly 200 includes a punch base 210, a movable punch 220, a rotating wedge 230, a second drive member 240, and a third drive member 250. The punch assembly 200 has a convex surface 260, which is pressed together with a concave surface 150. The rotating wedge 230, the second drive member 240, and the third drive member 250 are all mounted on the punch base 210. The movable punch 220 is connected to the output end of the second drive member 240. The second drive member 240 can drive the movable punch 220 to move relative to the punch base 210 along a first direction.

[0029] It should be noted that the number of rotating wedges 230 can be one or two. When there are two rotating wedges 230, the two rotating wedges 230 are respectively set on the opposite sides of the movable punch 220.

[0030] The pressure plate 120 can push the movable punch 220 to move along the first direction. When the pressure plate 120 presses the movable punch 220 along the first direction and compresses the second drive member 240, the movable punch 220 and the punch seat 210 can be staggered along the first direction so that one side edge of the processed part is bent to form a main body and a first flange (including but not limited to the flange on the rear water channel).

[0031] It should be noted that since the angle between the first flange and the main body is greater than or equal to 90 degrees, the first flange can be directly demolded.

[0032] The pressing slider 130 and the rotating wedge 230 can press together along the second direction (represented by N in the figure) so that the processed part is bent to form a main body and a second flange (including but not limited to a laser-welded side flange) set at an angle, and the second direction and the first direction are set at an acute angle;

[0033] It should be noted that there are two second flanges, and the second flanges are set at the two ends opposite to each other on the main body. Correspondingly, there are also two pressing sliders 130 and two rotating wedges 230.

[0034] The rotating wedge 230 is rotatably connected to the punch seat 210. The third drive member 250 can drive the rotating wedge 230 to rotate around its own axis so that the rotating wedge 230 can disengage from the area between the main body and the second flange, thereby realizing the demolding of the processed part.

[0035] Understandably, the first flange is positioned adjacent to the second flange.

[0036] It should be noted that the machined part is located between the concave surface 150 and the convex surface 260, and the machined part is approximately perpendicular to the first direction, while the second flange and the machined part are set at an acute angle.

[0037] The mold structure of this application can simultaneously achieve the processing and demolding of the first and second flanging in the same process, which greatly improves processing efficiency.

[0038] Furthermore, after the processed part of this application is stamped to form a main body and a second flange arranged at an angle, the rotating wedge 230 can be driven to rotate by the third driving member 250 so that the rotating wedge 230 can disengage from the area between the main body and the second flange, thereby realizing the demolding of the processed part.

[0039] As can be seen from the above, the mold structure of this application only requires one processing step to complete the stamping and demolding of multiple flanges (including the first flange and the second flange) of the processed parts, which greatly improves the processing efficiency and reduces the processing cost.

[0040] In one embodiment, such as Figure 3 As shown, the die assembly 100 also includes a first cutting portion 160 disposed toward the movable punch 220, the first cutting portion 160 being disposed on the die holder 110. The punch assembly 200 also includes a second cutting portion 270 disposed toward the die holder 110, the second cutting portion 270 being disposed on the punch holder 210. When the overall drive member drives the die assembly 100 to move toward the punch assembly 200, the first cutting portion 160 and the second cutting portion 270 can cut and engage to trim the edge portion of the processed part.

[0041] It should be noted that the first cutting part 160 and the second cutting part 270 can be used to trim the edge of the part located on the first flange side, or to trim the edge of the part located on the second flange side.

[0042] This setup allows for trimming of parts within the same process, further improving the processing efficiency of the mold structure.

[0043] In one embodiment, the overall drive member, the first drive member 140, the second drive member 240 and the third drive member 250 are all cylinders.

[0044] This configuration can improve the driving accuracy and efficiency of the overall driving component, the first driving component 140, the second driving component 240, and the third driving component 250.

[0045] However, this is not the only one. In other embodiments, the overall drive unit, the first drive unit 140, the second drive unit 240 and the third drive unit 250 may also be a hydraulic transmission mechanism or a motor.

[0046] Furthermore, in one embodiment, the first drive member 140 and the second drive member 240 are nitrogen springs.

[0047] It should be noted that nitrogen springs (also known as die nitrogen springs, nitrogen cylinders, or nitrogen cylinders) are a new type of elastic component that uses high-pressure nitrogen as the working medium. Nitrogen springs have many advantages such as small size, large elastic force, long stroke, and stable operation.

[0048] By setting the first drive component 140 and the second drive component 240 as nitrogen springs, the design and manufacturing of the mold structure can be simplified, the installation and adjustment of the mold structure can be facilitated, the service life of the mold structure can be extended, and the quality stability of the products processed from the processed parts can be ensured.

[0049] The working principle of the mold structure in this application is as follows: the punch assembly 200 is disposed below the die assembly 100, and the workpiece is placed on the convex surface 260 of the punch assembly 200.

[0050] The overall driving component drives the die assembly 100 to move downward along the first direction. At this time, the first cutting part 160 and the second cutting part 270 are staggered to cut off the excess edge part of the processed part, thereby completing the trimming of the processed part.

[0051] The first driving member 140 drives the pressure plate 120 to continue moving downward along the first direction. The driving force of the first driving member 140 is greater than the driving force of the second driving member 240. The second driving member 240 is compressed downward and the movable punch 220 moves downward. At this time, the punch seat 210 does not move. Therefore, the movable punch 220 and the punch seat 210 are staggered so that one edge of the processed part is bent upward to form a first flange.

[0052] When the second driving member 240 is compressed to the dead point, that is, when the movable punch 220 can no longer move downward, the first driving member 140 is compressed under the drive of the reaction force. Under the driving action of the overall driving member, the die holder 110 and the pressing slider 130 continue to move downward. The third driving member 250 drives the rotating wedge 230 to rotate and press and engage with the pressing slider 130, so that the other edge of the processed part is bent downward to form a second flange.

[0053] The third driving member 250 drives the rotating wedge to rotate, so that the rotating wedge 230 can disengage from the area between the main body and the second flange, thereby realizing the demolding of the processed parts.

[0054] In one embodiment, such as Figures 3-5 As shown, the third driving member 250 includes a driving body 251 and a transmission member 252. One end of the transmission member 252 is fixedly connected to the rotating wedge 230, and the other end is hinged to the driving body 251. The driving body 251 can drive the rotating wedge 230 to rotate through the transmission member 252.

[0055] This design reduces the assembly difficulty of the rotating wedge 230 and the third drive component 250.

[0056] Furthermore, in one embodiment, as Figures 3-5 As shown, the transmission component 252 includes a drive plate 2521 and a rotating shaft 2522. The output end of the drive body 251 is hinged to the rotating shaft 2522. The rotating shaft 2522 is fixedly inserted through the drive plate 2521 along the axial direction of the rotating wedge 230. One end of the drive plate 2521 away from the drive body 251 extends along the axial direction of the rotating wedge 230 and is fixedly connected to the rotating wedge 230.

[0057] This design helps to ensure that the rotating wedge 230 is subjected to uniform force at all points, preventing the rotating wedge 230 from deflecting.

[0058] In one embodiment, such as Figures 3-5As shown, the third driving component 250 also includes a limiting plate 253. One end of the limiting plate 253 is fixedly connected to the rotating wedge 230, and the other end extends out of the outer peripheral surface of the rotating wedge 230 along the radial direction. When the rotating wedge 230 and the pressing slider 130 are pressed together in the second direction, the end of the limiting plate 253 extending out of the outer peripheral surface of the rotating wedge 230 can cooperate with the stop of the punch seat 210.

[0059] This configuration can significantly improve the fitting accuracy of the rotating wedge 230 and the pressing slider 130, thereby improving the processing accuracy of the second flange.

[0060] Specifically, multiple limiting plates 253 are distributed at intervals along the axial direction of the rotating wedge 230 to ensure that the rotating wedge 230 is subjected to uniform force at all points.

[0061] Furthermore, in one embodiment, as Figures 3-5 As shown, the outer periphery of the rotating wedge 230 is provided with an installation notch 231 extending along its own axial direction, and the limiting plate 253 is fixedly connected to the inner wall of the installation notch 231.

[0062] This reduces the space occupied by the rotating wedge 230 and lowers the installation difficulty of the limiting plate 253 and the rotating wedge 230.

[0063] In one embodiment, such as Figure 5 As shown, the circumference of the rotating wedge 230 is provided with a limiting groove 232 extending around its own axis. The punch assembly 200 also includes a limiting block 280. One end of the limiting block 280 is fixedly connected to the punch seat 210, and the other end is inserted into the limiting groove 232 along the radial direction of the rotating wedge 230. The limiting block 280 can respectively stop and cooperate with the inner walls of the limiting groove 232 on both sides of the circumference of the rotating wedge 230 to limit the rotation range of the rotating wedge 230.

[0064] This design prevents the rotating wedge 230 from rotating excessively, thus protecting the rotating wedge 230.

[0065] Furthermore, in one embodiment, there are two limiting grooves 232, and the two limiting grooves 232 are distributed at both ends of the rotating wedge 230 along its own axial direction. Correspondingly, there are two limiting blocks 280, and the two limiting blocks 280 respectively cooperate with the corresponding limiting grooves 232 for limiting.

[0066] In this way, the uniformity of force on the rotating wedge 230 can be improved, and the rotating wedge 230 can be prevented from deflecting due to uneven force.

[0067] However, this is not the only one. In other embodiments, the number of limiting slots 232 and limiting blocks 280 may be one, three, four or more, etc., which will not be listed here.

[0068] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0069] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

[0070] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0071] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0072] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0073] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0074] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0075] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

Claims

1. A mold structure, characterized in that, It includes an integral drive unit, a die assembly (100) and a punch assembly (200), wherein the integral drive unit is capable of driving the die assembly (100) to move relative to the punch assembly (200) along a first direction; The die assembly (100) includes a die base (110), a pressure plate (120), a pressing slider (130), and a first driving member (140). The first driving member (140) and the pressing slider (130) are both mounted on the die base (110). The first driving member (140) can drive the pressure plate (120) to move along a first direction. The punch assembly (200) includes a punch base (210), a movable punch (220), a rotating wedge (230), a second drive member (240), and a third drive member (250). The rotating wedge (230), the second drive member (240), and the third drive member (250) are all mounted on the punch base (210). The second drive member (240) can drive the movable punch (220) to move relative to the punch base (210) along a first direction. When the pressure plate (120) presses the movable punch (220) along the first direction and compresses the second drive member (240), the movable punch (220) and the punch seat (210) can be staggered so that one edge of the processed part is bent to form a first flange; The pressing slider (130) and the rotating wedge (230) can be pressed together so that the other edge of the processed part can be bent to form a second flange. The third driving member (250) can drive the rotating wedge (230) to rotate relative to the punch seat (210) around its own axis so that the rotating wedge (230) can separate from the second flange.

2. The mold structure according to claim 1, characterized in that, The third driving component (250) includes a driving body (251) and a transmission component (252). One end of the transmission component (252) is fixedly connected to the rotating wedge (230), and the other end is hinged to the driving body (251). The driving body (251) can drive the rotating wedge (230) to rotate through the transmission component (252).

3. The mold structure according to claim 2, characterized in that, The transmission component (252) includes a drive plate (2521) and a rotating shaft (2522). The output end of the drive body (251) is hinged to the rotating shaft (2522). The rotating shaft (2522) is fixedly inserted through the drive plate (2521) along the axial direction of the rotating wedge (230). One end of the drive plate (2521) away from the drive body (251) extends along the axial direction of the rotating wedge (230) and is fixedly connected to the rotating wedge (230).

4. The mold structure according to claim 1, characterized in that, The third driving component (250) also includes a limiting plate (253). One end of the limiting plate (253) is fixedly connected to the rotating wedge (230), and the other end extends radially out of the outer circumferential surface of the rotating wedge (230). When the rotating wedge (230) and the pressing slider (130) are pressed together, the end of the limiting plate (253) extending out of the outer circumferential surface of the rotating wedge (230) can cooperate with the stop of the punch seat (210).

5. The mold structure according to claim 4, characterized in that, The outer periphery of the rotating wedge (230) is provided with an installation notch (231) extending along its own axial direction, and the limiting plate (253) is fixedly connected to the inner wall of the installation notch (231).

6. The mold structure according to claim 1, characterized in that, The rotating wedge (230) has a limiting groove (232) extending around its own axial direction on its periphery. The punch assembly (200) also includes a limiting block (280). One end of the limiting block (280) is fixedly connected to the punch seat (210), and the other end is inserted into the limiting groove (232) along the radial direction of the rotating wedge (230). The limiting block (280) can respectively stop and cooperate with the limiting groove (232) along the inner walls of both sides of the rotating wedge (230) in the circumferential direction to limit the rotation range of the rotating wedge (230).

7. The mold structure according to claim 6, characterized in that, There are two limiting grooves (232), which are distributed at both ends of the rotating wedge (230) along its own axial direction. There are two limiting blocks (280), which are respectively limited and engaged with the corresponding limiting grooves (232).

8. The mold structure according to claim 1, characterized in that, The die assembly (100) further includes a first cutting portion (160) disposed toward the movable punch (220), the first cutting portion (160) being disposed on the die holder (110). The punch assembly (200) further includes a second cutting portion (270) disposed toward the die holder (110), the second cutting portion (270) being disposed on the punch holder (210). When the integral drive member drives the die assembly (100) to move toward the punch assembly (200), the first cutting portion (160) can engage with the second cutting portion (270) to trim the edge portion of the processed part.

9. The mold structure according to claim 1, characterized in that, The overall drive unit, the first drive unit (140), the second drive unit (240) and the third drive unit (250) are all cylinders.

10. The mold structure according to claim 1, characterized in that, The first driving member (140) and the second driving member (240) are nitrogen springs.

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