Delayed material pressing type drawing die

Abstract

The utility model discloses a delayed material pressing type drawing die. The delayed material pressing type drawing die comprises an upper die base, a nitrogen spring assembly, a casting die assembly, a blank holder and a lower male die. The upper die holder is provided with a cavity for mounting the nitrogen spring component and the casting die component; the casting die assembly comprises a casting die body and a return spring; a convex part and an accommodating cavity are arranged on the casting die body; one end of the convex part of the casting die body is arranged in the cavity towards the direction of the lower convex die; the return springs are arranged on the two sides of the convex part, one ends abut against the bottom wall of the cavity, and the other ends abut against the pressing device body; the return spring jacks the part pressing device body into the upper die base when the part pressing device body is not pressed; the nitrogen spring assembly comprises a mounting bottom plate and a nitrogen spring; the nitrogen spring is fixed on the mounting bottom plate through a locking piece, and the nitrogen spring is arranged in the accommodating cavity; the nitrogen spring is inflated to push the part pressing device body to move towards the lower male die, so that the convex part is exposed out of the upper die base, and the plate gathering position is pressed; according to the utility model, the problems of wrinkling and bulging in the plate forming process are effectively solved.

Description

Technical Field

[0001] This utility model relates to the field of mold design, specifically a time-delayed pressing type drawing die. Background Technology

[0002] In the process of forming sheet metal, stamping machines usually apply pressure to the sheet metal through dies to achieve deformation or separation. However, in the stamping process of automotive parts, especially in some parts with complex shapes and designs (such as car doors and fenders), the sheet metal flows unevenly in the die. Especially when stamping corners, the material tends to accumulate at the corners during the stamping process, which can lead to bulges, wrinkles, or deformation. Even if the die is completely closed, these defects cannot be eliminated.

[0003] Traditional drawing dies typically use a blank holder to apply uniform pressure to the edges of the sheet metal. However, this makes it difficult to precisely control the pressure in areas prone to material accumulation, such as corners. Furthermore, conventional blanking methods cannot achieve dynamic pressure application, leading to excessive stretching or even damage to the sheet metal during the forming process, resulting in cracks and scratches. In addition, traditional mechanical blanking structures lack a delay function, which may cause residual pressure to damage parts during the die return stroke, making it difficult for the formed sheet metal to meet actual requirements.

[0004] In view of the problems in the background art mentioned above, the present invention aims to provide a time-delayed pressing type drawing die. Utility Model Content

[0005] The purpose of this utility model is to overcome the above-mentioned defects or problems in the background technology and provide a delayed pressing type drawing die, which has a simple structure, is easy to use, effectively solves the problems of bulging and wrinkling in the sheet metal forming process, and improves stamping efficiency and safety.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A time-delayed pressure drawing die includes: an upper die holder, a nitrogen spring assembly, a pressure piece assembly, a blank holder ring, and a lower punch;

[0008] The upper die base has a cavity for mounting a nitrogen spring assembly and a pressure device assembly; the upper die base reciprocates relative to the lower punch and drives the pressure ring to move synchronously.

[0009] A pressing assembly includes a pressing body and a return spring; the pressing body has a protrusion and a receiving cavity; one end of the pressing body with the protrusion is installed in the cavity facing downwards towards the punch; the return spring is installed on both sides of the protrusion, with one end of the return spring pressing against the bottom wall of the cavity and the other end supporting the pressing body; the return spring lifts the pressing body into the upper die holder when it is not under pressure.

[0010] A nitrogen spring assembly includes a mounting base plate and a nitrogen spring, the nitrogen spring assembly being installed in the cavity; the nitrogen spring is fixed to the mounting base plate by a locking member, and the nitrogen spring is installed in the receiving cavity of the pressing body; the nitrogen spring is inflated, pushing the pressing body downward towards the punch, so that the punch is exposed on the upper die seat, and pressing the die material gathering position.

[0011] Furthermore, it also includes a delay component; the delay component includes a contact plate and a roller mechanical valve; the roller mechanical valve is installed on one side of the upper mold base and connected to the nitrogen spring assembly; the contact plate is disposed on the pressure ring and is disposed on the same side as the roller mechanical valve; the roller mechanical valve moves with the upper mold base, and generates a pressure signal when it contacts the contact plate, thereby controlling the inflation or deflation of the nitrogen spring assembly.

[0012] Furthermore, the touch plate is also provided with a rounded corner to guide the roller to slide down. The rounded corner is formed on the side of the touch plate that contacts the roller mechanical valve, so as to guide the roller mechanical valve to slide smoothly into the side wall of the touch plate.

[0013] Furthermore, the roller-type mechanical valve includes a roller, a valve stem, and a mechanical valve body; one end of the valve stem is hinged to the mechanical valve body, and the other end is provided with a roller; during the downward movement of the roller, it abuts against the contact plate, pushes the valve stem towards the mechanical valve body, so that the side of the valve stem presses against the mechanical valve body, thereby causing the mechanical valve body to generate a pressure signal.

[0014] Furthermore, the nitrogen spring assembly also includes a mold base pad, which is installed around the nitrogen spring and abuts against the side of the press body with the receiving cavity; the mold base pad is used to limit the compression stroke of the nitrogen spring and prevent the nitrogen spring from being overloaded and damaged.

[0015] Furthermore, it also includes a quick connector; the gas source for the nitrogen spring assembly is accessed externally through the quick connector.

[0016] Furthermore, the pressure assembly also includes a spring pad, which is installed in the receiving cavity and cooperates with the nitrogen spring to distribute the downward pressure of the nitrogen spring evenly on the pressure assembly body.

[0017] Furthermore, a push rod is provided on the lower surface of the pressure ring, which pushes the pressure ring to separate from the lower punch.

[0018] Furthermore, the locking element is configured as a screw or bolt.

[0019] As can be seen from the above description of this utility model, compared with the prior art, this utility model has the following beneficial effects:

[0020] (1) This utility model provides a delayed pressing type drawing die, which has a simple structure and is easy to use. It effectively solves the problems of bulging and wrinkling during the forming process of sheet metal, and improves stamping efficiency and safety. This utility model adds a pressing component and a nitrogen spring component in the cavity inside the upper die base. The nitrogen spring component pushes the pressing component to move towards the lower die, so that the protrusion on the pressing component body is exposed to the upper die base, and presses the material accumulation position in advance, accurately controls the flow of material, and prevents wrinkling and bulging caused by material accumulation during the forming process of sheet metal, effectively improving the surface quality of the formed parts.

[0021] (2) In this new type of machine, a nitrogen spring assembly and a delay assembly are used to work together to ensure that the pressing action is synchronized with the rhythm of the punch press. The nitrogen spring is charged or vented by a pressure signal, which effectively avoids problems such as mold collision, workpiece sticking or production rhythm disorder, thereby improving the stability and safety of the production line.

[0022] (3) During the return stroke of the pressure body of this new type, the lower punch first lifts the pressure body, causing it to separate from the forming surface of the sheet metal. Then, when the nitrogen spring releases the pressure and returns to its free state, the return spring holds the pressure body hidden in the upper mold base, effectively preventing the forming sheet metal from being crushed or deformed due to residual pressure, and ensuring the dimensional accuracy and appearance quality of the finished product. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a front view of the delayed-pressing type drawing die described in this utility model;

[0025] Figure 2 This utility model Figure 1 A magnified view of part A shown;

[0026] Figure 3 This is a three-dimensional structural diagram of the nitrogen spring assembly described in this utility model;

[0027] Figure 4 This is a schematic diagram of the assembly of the nitrogen spring assembly, roller-type mechanical valve, and quick connector described in this utility model.

[0028] Figure 5 This is a three-dimensional structural diagram of the pressing device assembly described in this utility model;

[0029] Figure 6This is an exploded view of the nitrogen spring assembly and the pressure component assembly described in this utility model;

[0030] Figure 7 This is a cross-sectional schematic diagram of the delayed pressing type drawing die described in this utility model;

[0031] Figure 8 This is a schematic diagram showing the positions of each structure during the pressing process of the delayed pressing die of this utility model;

[0032] Figure 9 This is a schematic diagram showing the positions of each structure during the forming process of the delayed pressing type drawing die described in this utility model;

[0033] The reference numerals in the attached drawings are explained as follows: 1. Upper mold base; 11. Cavity; 2. Nitrogen spring assembly; 21. Mounting base plate; 22. Nitrogen spring; 23. Mold frame pad; 3. Pressing device assembly; 31. Pressing device body; 311. Protrusion; 312. Receiving cavity; 32. Return spring; 33. Spring pad; 4. Pressure ring; 41. Ejector pin; 5. Lower punch; 6. Delay assembly; 61. Contact plate; 62. Roller-type mechanical valve; 621. Roller; 622. Valve stem; 623. Mechanical valve body; 7. Locking connector; 8. Mold; 9. Sheet metal; 10. Quick connector Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are preferred embodiments of the present utility model and should not be considered as excluding other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0035] Unless otherwise expressly defined, the use of terms such as "first," "second," or "third" in the claims, description, and drawings of this utility model is for distinguishing different objects and not for describing a specific order.

[0036] Unless otherwise expressly defined, in the claims, description, and accompanying drawings of this utility model, the use of directional terms such as "center," "lateral," "longitudinal," "horizontal," "vertical," "top," "bottom," "inner," "outer," "upper," "lower," "front," "rear," "left," "right," "clockwise," and "counterclockwise" to indicate orientation or positional relationships is based on the orientation and positional relationships shown in the accompanying drawings and is only for the convenience of describing this utility model and simplifying the description. It does 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 limiting the specific protection scope of this utility model.

[0037] Unless otherwise expressly defined, the terms "fixed connection" or "fixed connection" used in the claims, description and drawings of this utility model shall be interpreted broadly, that is, any connection in which there is no displacement relationship or relative rotation relationship between the two parties, including non-removable fixed connection, detachable fixed connection, integral connection and fixed connection through other devices or components.

[0038] In the claims, description and drawings of this utility model, the terms "comprising", "having" and variations thereof are used to mean "including but not limited to".

[0039] See Figure 1-9 A time-delayed pressure drawing die includes: an upper die holder 1, a nitrogen spring assembly 2, a pressure piece assembly 3, a pressure ring 4, and a lower punch 5;

[0040] The upper mold base 1 has a cavity 11 for mounting a nitrogen spring assembly 2 and a pressure device assembly 3; the upper mold base 1 reciprocates relative to the lower punch 5 and drives the pressure ring 4 to move synchronously.

[0041] The pressing assembly 3 includes a pressing body 31, a return spring 32, and a spring pad 33;

[0042] The pressing body 31 has a protrusion 311 and a receiving cavity 312; the pressing body 31 has one end of the protrusion 311 facing downward in the direction of the punch 5 and is installed in the cavity 11.

[0043] A return spring 32 is installed on both sides of the protrusion 311, with one end of the return spring 32 pressing against the bottom wall of the cavity 11 and the other end supporting the presser body 31; the return spring 32 lifts the presser body 31 into the upper mold base 1 when it is not under pressure.

[0044] Spring pad 33 is installed in the receiving cavity 312 and cooperates with the nitrogen spring 22 to make the downward pressure of the nitrogen spring 22 evenly distributed on the pressure body 31.

[0045] Nitrogen spring assembly 2 includes a mounting base plate 21, a nitrogen spring 22, and a mold frame pad 23; the nitrogen spring assembly 2 is installed in the cavity 11.

[0046] A nitrogen spring 22 is fixed to the mounting base plate 21 by a locking member 7, and the nitrogen spring 22 is installed in the receiving cavity 312 of the pressing body 31. When the nitrogen spring 22 is inflated, it pushes the pressing body 31 to move downward towards the punch 5, so that the protrusion 311 is exposed on the upper die seat 1 and presses the material gathering position of the plate 9.

[0047] The mold frame pad 23 is installed around the nitrogen spring 22 and abuts against the side of the press body 31 with the receiving cavity 312; the mold frame pad 23 is used to limit the compression stroke of the nitrogen spring 22 and prevent the nitrogen spring 22 from being overloaded and damaged.

[0048] Delay component 6; the delay component 6 includes a contact plate 61 and a roller mechanical valve 62; the roller mechanical valve 62 is installed on one side of the upper mold base 1 and connected to the nitrogen spring assembly 2; the contact plate 61 is disposed on the pressure ring 4 and is disposed on the same side as the roller mechanical valve 62; the roller mechanical valve 62 moves with the upper mold base 1, and generates a pressure signal when it contacts the contact plate 61, thereby controlling the inflation or deflation of the nitrogen spring assembly 2.

[0049] The touch plate 61 has a rounded corner that guides the roller 621 to slide down. The rounded corner is formed on the side of the touch plate 61 that contacts the roller mechanical valve 62, so as to guide the roller mechanical valve 62 to slide smoothly into the side wall of the touch plate 61.

[0050] The roller-type mechanical valve 62 includes a roller 621, a valve stem 622, and a mechanical valve body 623. One end of the valve stem 622 is hinged to the mechanical valve body 623, and the other end is provided with the roller 621. During the downward movement of the roller 621, it abuts against the contact plate 61, pushing the valve stem 622 towards the mechanical valve body 623, so that the side of the valve stem 622 presses against the mechanical valve body 623, thereby causing the mechanical valve body 623 to generate a pressure signal.

[0051] Quick connector 10, through which the gas source of the nitrogen spring assembly 2 is accessed from the outside.

[0052] The pressure ring 4 has a push rod 41 on its lower surface, which pushes the pressure ring 4 to separate from the lower punch 5.

[0053] Locking element 7, which is configured as a screw or bolt.

[0054] Working principle and usage process of this utility model:

[0055] See Figures 7 to 9 ;

[0056] Before the stamping begins, the mold 8 and the sheet metal 9 are installed on the upper mold base 1 and the pressure ring 4 respectively. Then, the stamping equipment starts to work. The upper mold base 1 is first raised away from the lower punch 5. At this time, the upper mold base 1 and the pressure ring 4 are not in contact, the delay component 6 has not started to work, and the nitrogen spring 22 is in a free state. The press body 31 is pushed up into the upper mold base 1 by the return spring 32.

[0057] As the stamping equipment continues to operate, the upper die holder 1 moves towards the lower punch 5, pressing against the pressure ring 4 and simultaneously moving the pressure ring 4 towards the lower punch 5. At this time, the sheet metal 9 presses against the die 8 and is pressed into the die 8 under the action of the lower punch 5. During the downward movement of the upper die holder 1, the roller-type mechanical valve 62 on the upper die holder 1 contacts the contact plate 61 on the pressure ring 4 and slides smoothly towards the contact plate 61 under the guidance of the rounded corners on the contact plate 61. Side wall; During the downward movement of the roller mechanical valve 62, the roller 621 abuts against the contact plate 61, and the push valve rod 622 moves towards the mechanical valve body 623, so that the side of the valve rod 622 presses against the mechanical valve body 623, thereby causing the mechanical valve body 623 to generate a pressure signal and control the nitrogen spring assembly 2 to start charging, thereby pushing the pressing body 31 to move towards the lower punch 5, so that the protrusion 311 of the pressing body 31 is exposed on the upper die seat 1, and presses the material accumulation position of the plate 9.

[0058] The upper mold base 1 drives the pressure ring 4 to move downward continuously, and the plate 9 is pressed against the bottom wall of the upper mold base 1 by the lower punch 5. At this time, the upper mold base 1 and the lower punch 5 are completely closed, the pressing body 31 is pushed into the upper mold base 1 by the lower punch 5 and pressed against the mold frame pad 23. The nitrogen spring 22 is compressed to the bottom by the pressing body 31, thus completing the pressing and forming of the plate 9.

[0059] After forming, the ejector pin 41 pushes the pressure ring 4 away from the lower punch 5, and the formed sheet metal 9 is lifted up as the pressure ring 4 rises. The upper die holder 1 gradually separates from the pressure ring 4 under the drive of the stamping equipment. The roller mechanical valve 62 separates from the contact plate 61, the pressure signal gradually weakens, the nitrogen spring 22 exhausts gas and returns to its free state. The return spring 32 holds the press body 31 to hide the press body 31 inside the upper die holder 1, so that the press body 31 will not squeeze and deform the formed sheet metal 9 due to the residual pressure of the nitrogen spring 22. Finally, the formed sheet metal 9 is taken out and trimmed to obtain the final product.

[0060] This invention provides a delayed-pressing type drawing die, which has a simple structure and is easy to use. It effectively solves the problems of bulging and wrinkling during sheet metal forming, while improving stamping efficiency and safety. This invention adds a pressing component and a nitrogen spring component inside the cavity of the upper die holder. The nitrogen spring component pushes the pressing component towards the lower die, exposing the protrusion on the pressing component body to the upper die holder and pre-pressing the material accumulation position, precisely controlling the material flow and preventing wrinkling and bulging caused by material accumulation during sheet metal forming, effectively improving the surface quality of the formed parts. Furthermore, during the return stroke of the pressing component body, the lower punch first lifts the pressing component body, causing it to detach from the forming surface of the sheet metal. Then, when the nitrogen spring releases pressure and returns to its free state, the return spring holds the pressing component body back into the upper die holder, effectively preventing damage or deformation of the formed sheet metal due to residual pressure, ensuring the dimensional accuracy and appearance quality of the finished product. In addition, this invention uses the nitrogen spring component and the delayed component for coordinated control to ensure that the pressing action is synchronized with the stamping rhythm. By triggering the inflation or deflation of the delayed nitrogen spring by a pressure signal, problems such as mold collision, workpiece sticking, or production rhythm disorder are effectively avoided, thereby improving the stability and safety of the production line.

[0061] The foregoing description of the specifications and embodiments is intended to explain the scope of protection of this utility model, but does not constitute a limitation on the scope of protection of this utility model. Modifications, equivalent substitutions, or other improvements to the embodiments of this utility model or a portion thereof that can be obtained by those skilled in the art through logical analysis, reasoning, or limited experimentation, based on the teachings of this utility model or the foregoing embodiments, should all be included within the scope of protection of this utility model.

Claims

1. A time-delayed blanking type drawing die, characterized in that, include: The upper die base, nitrogen spring assembly, pressure device assembly, pressure ring, and lower punch; the upper die base has a cavity for mounting the nitrogen spring assembly and the pressure device assembly; the upper die base reciprocates relative to the lower punch, and drives the pressure ring to move synchronously. A pressing assembly includes a pressing body and a return spring; the pressing body has a protrusion and a receiving cavity; one end of the pressing body with the protrusion is installed in the cavity facing downwards towards the punch; the return spring is installed on both sides of the protrusion, with one end of the return spring pressing against the bottom wall of the cavity and the other end supporting the pressing body; the return spring lifts the pressing body into the upper die holder when it is not under pressure. A nitrogen spring assembly includes a mounting base plate and a nitrogen spring, the nitrogen spring assembly being installed in the cavity; the nitrogen spring is fixed to the mounting base plate by a locking member, and the nitrogen spring is installed in the receiving cavity of the pressing body; the nitrogen spring is inflated, pushing the pressing body downward towards the punch, so that the punch is exposed on the upper die seat, and pressing the material accumulation position of the sheet metal.

2. The delayed-pressing type drawing die as described in claim 1, characterized in that: It also includes a delay component; the delay component includes a contact plate and a roller mechanical valve; the roller mechanical valve is installed on one side of the upper mold base and connected to the nitrogen spring assembly; the contact plate is disposed on the pressure ring and is disposed on the same side as the roller mechanical valve; the roller mechanical valve moves with the upper mold base, and generates a pressure signal when it contacts the contact plate, thereby controlling the inflation or deflation of the nitrogen spring assembly.

3. The delayed-pressing type drawing die as described in claim 2, characterized in that: The touch plate is also provided with a rounded corner to guide the roller to slide down. The rounded corner is formed on the side of the touch plate that contacts the roller mechanical valve, so as to guide the roller mechanical valve to slide smoothly into the side wall of the touch plate.

4. A delayed-press type drawing die as described in claim 2 or 3, characterized in that: The roller-type mechanical valve includes a roller, a valve stem, and a mechanical valve body; one end of the valve stem is hinged to the mechanical valve body, and the other end is provided with a roller; during the downward movement of the roller, it abuts against the contact plate, pushes the valve stem towards the mechanical valve body, so that the side of the valve stem presses against the mechanical valve body, thereby causing the mechanical valve body to generate a pressure signal.

5. The delayed-pressing type drawing die as described in claim 2, characterized in that: The nitrogen spring assembly also includes a mold base pad, which is installed around the nitrogen spring and abuts against the side of the press body with the receiving cavity; the mold base pad is used to limit the compression stroke of the nitrogen spring and prevent the nitrogen spring from being overloaded and damaged.

6. The delayed-pressing type drawing die as described in claim 1, characterized in that: It also includes a quick connector; the gas source for the nitrogen spring assembly is accessed from the outside through the quick connector.

7. The delayed-pressing type drawing die as described in claim 1, characterized in that: The press assembly also includes a spring pad, which is installed in the receiving cavity and cooperates with the nitrogen spring to distribute the downward pressure of the nitrogen spring evenly on the press body.

8. The delayed-pressing type drawing die as described in claim 1, characterized in that: The lower surface of the pressure ring is also provided with a push rod, which pushes the pressure ring to separate from the lower punch.

9. A delayed-press type drawing die as described in claim 1, characterized in that: The locking element is configured as a screw or bolt.

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