Precision mold with buffering protection function
Through the precision mold of the limit ball and buffer pressure-pressure component, the problems of friction scratches, excessive tensile stress and difficulty in demolding of the metal sheet during the stamping process of the bending mold are solved, and precise positioning, molding quality improvement and efficient automated production are achieved.
Patent Information
- Application Number
- CN202510719832.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-30
- Publication Date
- 2025-07-11
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
During the single stamping process of existing bending molds, metal sheets are prone to friction scratches, and the tensile stress in the middle is too large, resulting in uneven molding thickness, obvious quality defects, and difficult to demold.
The precision mold with buffer protection function is adopted to achieve accurate positioning and progressive loading of the metal plate through the limiting ball and the buffering pressure-applied component, avoid instantaneous stress concentration, ensure molding quality, and automatically release the mold through the limiting ball.
Effectively prevent metal plates from sliding, ensure accurate positioning of the bent lines, avoid thickness reduction, improve molding quality, simplify the mold release process, and improve production efficiency.
Smart Images
Figure CN120286546A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of molds, and in particular to a precision mold with a buffer protection function. Background Art
[0002] A bending mold is a type of forming mold in the stamping mold family. It uses the concentrated force applied to a metal sheet to cause it to plastically bend around a preset axis (called the bending line), thereby obtaining a part with the required angle and shape.
[0003] During the manufacturing of a bending mold, the metal sheet needs to be clamped by a positioning auxiliary device to ensure the precise positioning of the bending line. In the process of multiple bends, if directly stamped at one time, it will cause the mold to rub against the metal sheet, resulting in scratches at the contact part of the metal sheet. Moreover, synchronous bending will cause a relatively large forming tensile stress in the middle metal sheet material, resulting in the thickness of the metal sheet at the bending part being significantly lower than the normal standard, causing quality defects. And currently, in order to ensure that the formed metal component does not rebound, the mold often compensates for the bending angle, which makes the formed metal component fit tightly with the stamping mold and is not easy to demold. Based on this, a precision mold with a buffer protection function is proposed. Summary of the Invention
[0004] The purpose of the present invention is to solve the problems in the prior art that one-time stamping will cause the mold to rub against the metal sheet, resulting in scratches at the contact part of the metal sheet, and synchronous bending will cause a relatively large forming tensile stress in the middle metal sheet material, resulting in the thickness of the metal sheet at the bending part being significantly lower than the normal standard, causing quality defects, and to propose a precision mold with a buffer protection function.
[0005] In order to achieve the above purpose, the present invention adopts the following technical scheme:
[0006] A precision mold with a buffer protection function includes a mold base and a combined stamping mold group driven by a hydraulic device. A double bending die cavity is opened in the mold base, a control connection chamber is opened in the mold base, an internal pressure control plate is arranged in the control connection chamber, internal tensile traction members for positioning and pressing the metal component are arranged on both sides of the internal pressure control plate, rectangular traction openings are opened on both sides of the top of the control connection chamber, the internal tensile traction members penetrate through the rectangular traction openings and extend outwards, and are fixedly connected with limit clamping balls. Reset receiving plates are arranged on both sides of the internal pressure control plate;
[0007] The combined stamping die set includes an inner die stamping core and outer die stamping cores arranged on both sides of the inner die stamping core. A stamping assembly seat is fixedly connected to the top of the inner die stamping core. The stamping assembly seat is combined and connected with a hydraulic device. Hydraulic cylinders are arranged on both sides of the stamping assembly seat. The end of the hydraulic cylinder is connected with a joint control positioning cone through a stamping combination seat. The stamping combination seat is connected with the outer die stamping core through a buffer pressure application component;
[0008] A positioning hole adapted to the joint control positioning cone is opened on the die seat, and a controllable constant pressure device for cooperating with the joint control positioning cone is opened on the reset pressure receiving plate.
[0009] As a preferred solution, the inner pulling traction member includes a connection port opened on the side wall of the inner pressure control plate. The inner wall of the connection port is connected with an inner traction rod through a torsion spring shaft. The inner traction rod is connected with an outer traction rod through a T-shaped spring telescopic rod. The end of the outer traction rod is connected with the side wall of the limit clamping ball.
[0010] As a preferred solution, the buffer pressure application component includes buffer ports opened on both sides of the outer die stamping core. A pressure application block is fixedly connected to the inner side wall of the stamping combination seat. The pressure application block is located in the buffer port and is connected with the inner wall of the buffer port through a buffer spring.
[0011] As a preferred solution, a reset cavity communicating with the positioning hole is opened on the side wall of the joint control chamber. The reset pressure receiving plate is located in the reset cavity and is connected with the inner wall of the reset cavity through a reset spring.
[0012] As a preferred solution, the controllable constant pressure device includes a pressure resistance port opened on the reset pressure receiving plate and adapted to the positioning hole. A control cavity is opened in the inner pressure control plate. Two oppositely arranged sliding baffles are slidably arranged on the inner wall of the control cavity. A cooperation port adapted to the pressure resistance port is opened on the sliding baffle.
[0013] As a preferred solution, an electric push rod is arranged on the inner pressure control plate. The output end of the electric push rod penetrates into the control cavity and is fixedly connected with a V-shaped pressure plate. Adjacent two sliding baffles are connected through a traction spring. An inclined surface linkage block is fixedly connected to the side wall of the sliding baffle.
[0014] As a preferred solution, a spherical vertical concave opening is opened on the outer side wall of the outer die stamping core. The spherical vertical concave opening is adapted to the limit clamping ball.
[0015] As a preferred solution, the double-bending die cavity is composed of a first stamping die cavity below and second stamping die cavities arranged on both sides of the first stamping die cavity. The first stamping die cavity is used in cooperation with the inner die stamping core, and the second stamping die cavity is used in cooperation with the outer die stamping core.
[0016] Compared with the prior art, the beneficial effects of the present invention are:
[0017] 1. Before the stamping die stamps, the metal plate is effectively positioned through the limit clamping balls. During the entire stamping process, the limit clamping balls apply an inward clamping force and a normal pressure along the direction of the plate to the metal plate, effectively preventing the metal plate from sliding during stamping and ensuring the accurate positioning of the bending line.
[0018] 2. During the stamping process of the stamping die, the buffer pressure application component controls the pressure application intensity of the outer die stamping core, avoiding excessive impact during initial contact. The linked positioning cone and the controllable pressure receiving device cooperate, and the pressure transmission path is opened in stages through the sliding baffle to achieve the progressive loading of the punching force and reduce the instantaneous stress concentration.
[0019] 3. The normal pressure continuously applied by the limit clamping balls in the present invention balances the material tensile stress during the bending process, avoiding the thickness reduction of the middle part of the metal plate due to excessive stretching, ensuring that the thickness at the bending part meets the standard, improving the forming quality. When demolding, the balls reset to block the upward movement of the workpiece, realizing automatic demolding, solving the fitting problem caused by angle compensation in traditional molds. During the staged bending process, the residual stress is naturally released, reducing the need for springback and further reducing the demolding difficulty. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 is a schematic assembly structure diagram of a precision die with a buffer protection function proposed by the present invention;
[0021] Figure 2 is a three-dimensional structure diagram of a precision die with a buffer protection function proposed by the present invention;
[0022] Figure 3 is Figure 2 an enlarged structure diagram of part A in
[0023] Figure 4 is a schematic connection relationship structure diagram of the internal pressure control plate and the internal tension traction part in a precision die with a buffer protection function proposed by the present invention;
[0024] Figure 5 is a schematic cross-sectional structure diagram of the internal pressure control plate in a precision die with a buffer protection function proposed by the present invention;
[0025] Figure 6 is a schematic cross-sectional structure diagram of the die base in a precision die with a buffer protection function proposed by the present invention;
[0026] Figure 7 is Figure 6 an enlarged structure diagram of part B in
[0027] Figure 8 is a schematic structure diagram of the controllable pressure receiving device in a precision die with a buffer protection function proposed by the present invention.
[0028] In the figure: 1, mold base; 2, double-bending die cavity; 3, joint control chamber; 4, internal pressure control plate; 5, rectangular traction port; 6, limit clamping ball; 7, reset pressure receiving plate; 8, internal die stamping core; 9, external die stamping core; 10, stamping assembly seat; 11, hydraulic cylinder; 12, joint control positioning cone; 13, positioning hole; 14, torsion spring shaft; 15, internal traction rod; 16, T-shaped spring telescopic rod; 17, external traction rod; 18, buffer port; 19, pressure applying block; 20, reset spring; 21, pressure blocking port; 22, sliding baffle; 23, mating port; 24, electric push rod; 25, V-shaped pressing plate; 26, inclined surface linkage block; 27, spherical vertical concave port; 28, stamping combination seat. Detailed implementation manners
[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. 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.
[0030] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "top / bottom end", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.
[0031] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "provided with", "sheathed / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.
[0032] Example, refer to Figures 1 to 8, A precision mold with a buffer protection function, including a mold base 1 and a combined stamping die set driven by a hydraulic device. The hydraulic device is a prior art and will not be elaborated in detail here. A double-bending die cavity 2 is provided in the mold base 1. Further, the double-bending die cavity 2 is composed of a first stamping die cavity below and second stamping die cavities arranged on both sides of the first stamping die cavity. The first stamping die cavity is used in cooperation with an inner die stamping core 8, and the second stamping die cavity is used in cooperation with an outer die stamping core 9. The hydraulic device generates a downward punching force on the combined stamping die set to achieve the stamping and forming of components. During forming, first, the inner die stamping core 8 impacts the metal component, and in cooperation with the first stamping die cavity, the bending and forming of the bottom of the metal component are achieved. Then, with the cooperation of the inner pulling traction member, a pressure along the direction of the metal plate is generated on the metal component, and in cooperation with the outer die stamping core, it is bent again to achieve the stamping and forming of the metal component.
[0033] A control connection chamber 3 is provided in the mold base 1. An internal pressure control plate 4 is arranged in the control connection chamber 3. The internal pressure control plate 4 can move up and down in the control connection chamber 3 to control the inner pulling traction member rotatably connected to it. Inner pulling traction members for positioning and pressing the metal component are arranged on both sides of the internal pressure control plate 4. Further, the inner pulling traction member includes a connection port opened on the side wall of the internal pressure control plate 4. An inner traction rod 15 is connected to the inner wall of the connection port through a torsion spring shaft 14. A torsion spring is arranged in the torsion spring shaft 14 for generating a torsional force on the inner traction rod 15 from both sides of the mold base 1 towards the middle, for different effects on the metal component at different stages. The inner traction rod 15 is connected to an outer traction rod 17 through a T-shaped spring telescopic rod 16. The end of the outer traction rod 17 is connected to the side wall of the limit clamping ball 6.
[0034] It should be noted that a T-shaped opening is provided inside the outer traction rod 17. The T-shaped spring telescopic rod 16 is located in the T-shaped opening and is connected to the inner wall of the T-shaped opening through a spring, enabling the relative telescopic movement between the inner traction rod 15 and the outer traction rod 17.
[0035] Rectangular traction openings 5 are provided on both sides of the top of the control connection chamber 3. The inner pulling traction member passes through the rectangular traction openings 5 and extends outwards, and is fixedly connected to a limit clamping ball 6. Reset receiving plates 7 are arranged on both sides of the internal pressure control plate 4;
[0036] The combined stamping die set includes an inner die stamping core 8 and outer die stamping cores 9 arranged on both sides of the inner die stamping core 8. Further, a spherical vertical concave opening 27 is provided on the outer side wall of the outer die stamping core 9. The spherical vertical concave opening 27 is adapted to the limit clamping ball 6. The advantage of adopting the above structure is that after the metal component is formed, it will be clamped on the side wall of the outer die stamping core 9. At this time, the metal component will be driven by the combined stamping die. At this time, the limit clamping ball 6 connected to the inner pulling traction member will move downward at the spherical vertical concave opening 27. At this time, the limit clamping ball 6 will automatically demold the formed metal component, thereby improving the forming efficiency of the mold.
[0037] A stamping assembly seat 10 is fixedly connected to the top of the inner die stamping core 8, and the stamping assembly seat 10 is combined and connected with the hydraulic device. Hydraulic cylinders 11 are arranged on both sides of the stamping assembly seat 10. The ends of the hydraulic cylinders 11 are connected to the joint control positioning cones 12 through the stamping combination seat 28. The stamping combination seat 28 is connected to the outer die stamping core 9 through a buffer pressure component; further, the buffer pressure component includes a buffer port 18 opened on both sides of the outer die stamping core 9, and a pressure block 19 is fixedly connected to the inner wall of the stamping combination seat 28. The pressure block 19 is located in the buffer port 18 and is connected to the inner wall of the buffer port 18 through a buffer spring.
[0038] A positioning hole 13 matched with the joint control positioning cone 12 is provided on the mold base 1, a controllable pressure device used in conjunction with the joint control positioning cone 12 is provided on the reset pressure plate 7, a reset cavity connected with the positioning hole 13 is provided on the side wall of the joint control chamber 3, the reset pressure plate 7 is in the reset cavity and is connected to the inner wall of the reset cavity through a reset spring 20.
[0039] Furthermore, the controllable constant pressure device includes a pressure-blocking port 21 provided on the reset pressure plate 7 and adapted to the positioning hole 13, a control cavity is provided in the internal pressure control plate 4, two relatively arranged sliding baffles 22 are slidably provided on the inner wall of the control cavity, a matching port 23 adapted to the pressure-blocking port 21 is provided on the sliding baffle 22, and in the initial stage, the matching port 23 provided on the sliding baffle 22 and the pressure-blocking port 21 are in a misaligned state.
[0040] Furthermore, an electric push rod 24 is provided on the internal pressure control plate 4, the output end of the electric push rod 24 passes through the control cavity and is fixedly connected to a V-shaped pressure plate 25, and two adjacent sliding baffles 22 are connected by a traction spring, and the side wall of the sliding baffle 22 is fixedly connected to a sloped linkage block 26. When the inner mold stamping core 8 and the outer mold stamping core 9 work together and need to continue to move downward for stamping, the electric push rod 24 can be turned on to drive the V-shaped pressure plate 25 to move downward. Under the action of the extrusion force, the sliding baffle 22 will produce horizontal movement, so that the matching port 23 originally opened on the sliding baffle 22 is aligned with the pressure-blocking port 21. At this time, the positioning hole 13, the pressure-blocking port 21 and the matching port 23 are on the same axis, which can meet the downward movement of the joint control positioning cone 12.
[0041] When the present invention is used, the inner pulling member in a vertical state under the torsion spring is pulled to both sides to become an inclined state (the T-shaped spring telescopic rod 16 is in a stretched and force-storing state). At this time, the metal plate of the metal component for stamping is placed between the limit clamping balls 6 on both sides. At this time, the limit clamping balls 6 on both sides will generate inward pressure on the metal plate, thereby ensuring the positioning of the metal component, ensuring that the metal plate can be accurately positioned on the double-bending mold cavity 2, and ensuring the quality of the forming;
[0042] At this time, the stamping assembly seat 10 is driven downward by the hydraulic device, and the inner die stamping core 8 moves into the double bending die cavity 2, which will generate downward stamping force on the metal plate. At this time, the limit clamping ball 6 is stuck at the metal plate, which will always generate pressure on the metal plate, which can prevent the metal plate from sliding when being stamped by the inner die stamping core 8, thereby causing the metal component to have poor forming quality;
[0043] The inner die stamping core 8 cooperates with the first stamping die cavity to achieve a first-step bending of the bottom of the metal component. At this time, the bending is not completely to the bottom, but it can ensure that the metal plate is fixed under the cooperation of the inner die stamping core 8 and the first stamping die cavity;
[0044] The hydraulic cylinder 11 drives the stamping assembly seat 28 connected to its output end to move downward. In the initial stage of the downward movement of the stamping assembly seat 28, the outer mold stamping core 9 on both sides will be driven to move downward and contact with the metal plate to generate pressure on the metal plate (the pressure is not enough to bend directly). In the initial stage, when the stamping assembly seat 28 moves downward, the joint control positioning cone 12 originally in the positioning hole 13 will continue to move downward. The downward movement of the joint control positioning cone 12 will drive the internal pressure control plate 4 to move downward (at this time, the matching port 23 and the pressure blocking port 21 are in a misaligned state). The downward movement of the internal pressure control plate 4 will drive the internal pulling parts on both sides to generate downward potential on the limit card ball 6, and the limit card ball 6 will apply pressure to the metal plate The two ends of the metal plate make the two ends of the metal plate always exert positive pressure along the direction of the metal plate. Under the action of the positive pressure, when the inner die stamping core 8 continues to move downward to cooperate with the first stamping die cavity for stamping and bending, and the outer die stamping core 9 moves downward to cooperate with the second stamping die cavity for stamping and bending, the torsional force and positive pressure of the limiting clamping ball 6 are used to ensure that the metal plate is always under pressure from both ends to the middle, so as to ensure that the formed metal plate is always under pressure at the bending part, avoiding excessive deformation and quality defects caused by thinning of the thickness due to excessive pressure in the middle part. Under the action of the limiting clamping ball 6 with positive pressure at all times, the metal plate is also prevented from sliding during stamping, which significantly improves the accuracy and forming quality of metal components.
[0045] After the stamping is completed, the metal component will move upward with the outer mold stamping core 9. At this time, the limit ball 6 is in a vertical state under the action of the torsion spring shaft 14, and part of the limit ball 6 is in the spherical vertical recess 27. When the outer mold stamping type 9 moves upward, the limit ball 6 will block the upward movement of the formed metal component, thereby realizing automatic demolding of the metal component, thereby significantly improving production efficiency. The mold uses the dynamic pressure system of the limit ball 6 and the staged buffer stamping structure to simultaneously solve the four major pain points of positioning drift, scratches, thickness reduction, and demolding difficulties in traditional bending, and realizes efficient and automated production while ensuring forming accuracy.
[0046] As described above, it is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes should be covered within the protection scope of the present invention.
Claims
1. A precision mold with a buffer protection function, comprising a mold base (1) and a combined stamping die set driven by a hydraulic device, characterized in that, A double-bending die cavity (2) is provided in the die holder (1). A control chamber (3) is provided in the die holder (1). An internal pressure control plate (4) is arranged in the control chamber (3). Inner pulling and traction members for positioning and pressing the metal member are arranged on both sides of the internal pressure control plate (4). Rectangular traction openings (5) are provided on both sides of the top of the control chamber (3). The inner pulling and traction members penetrate through the rectangular traction openings (5) and extend outwards, and are fixedly connected with limit clamping balls (6). Reset pressure receiving plates (7) are arranged on both sides of the internal pressure control plate (4). The combined stamping die set includes an inner die stamping core (8) and outer die stamping cores (9) arranged on both sides of the inner die stamping core (8). A stamping assembly seat (10) is fixedly connected to the top of the inner die stamping core (8). The stamping assembly seat (10) is combinedly connected with a hydraulic device. Hydraulic cylinders (11) are arranged on both sides of the stamping assembly seat (10). The end of the hydraulic cylinder (11) is connected with a control positioning cone (12) through a stamping combination seat (28). The stamping combination seat (28) is connected with the outer die stamping core (9) through a buffer pressing assembly. A positioning hole (13) adapted to the control positioning cone (12) is provided on the die holder (1). A controllable constant pressure device adapted to the control positioning cone (12) is provided on the reset pressure receiving plate (7).
2. The precision mold with a buffer protection function according to claim 1, characterized in that, The inner pulling and traction member includes a connection port opened on the side wall of the internal pressure control plate (4). The inner wall of the connection port is connected with an inner traction rod (15) through a torsion spring shaft (14). The inner traction rod (15) is connected with an outer traction rod (17) through a T-shaped spring telescopic rod (16). The end of the outer traction rod (17) is connected with the side wall of the limit clamping ball (6).
3. The precision mold with a buffer protection function according to claim 1, characterized in that The buffer pressing assembly includes buffer openings (18) opened on both sides of the outer die stamping core (9). A pressing block (19) is fixedly connected to the inner side wall of the stamping combination seat (28). The pressing block (19) is located in the buffer opening (18) and is connected with the inner wall of the buffer opening (18) through a buffer spring.
4. A precision mold with a buffer protection function according to claim 1, characterized in that, A reset cavity communicating with the positioning hole (13) is provided on the side wall of the control chamber (3). The reset pressure receiving plate (7) is located in the reset cavity and is connected with the inner wall of the reset cavity through a reset spring (20).
5. A precision mold with a buffer protection function according to claim 1, characterized in that, The controllable constant pressure device includes a pressure blocking port (21) opened on the reset pressure receiving plate (7) and adapted to the positioning hole (13). A control chamber is provided in the internal pressure control plate (4). Two relatively arranged sliding baffles (22) are slidably arranged on the inner wall of the control chamber. A matching port (23) adapted to the pressure blocking port (21) is provided on the sliding baffle (22).
6. The precision mold with a buffer protection function according to claim 5, characterized in that, An electric push rod (24) is arranged on the internal pressure control plate (4). The output end of the electric push rod (24) penetrates into the control chamber and is fixedly connected with a V-shaped pressing plate (25). Adjacent sliding baffles (22) are connected through a traction spring. An inclined plane linkage block (26) is fixedly connected to the side wall of the sliding baffle (22).
7. A precision mold with a buffer protection function according to claim 1, characterized in that, A spherical vertical concave opening (27) is provided on the outer side wall of the outer die stamping core (9). The spherical vertical concave opening (27) is adapted to the limit clamping ball (6).
8. A precision mold with a buffer protection function according to claim 1, characterized in that, The double-bending die cavity (2) is composed of a first stamping die cavity below and second stamping die cavities arranged on both sides of the first stamping die cavity. The first stamping die cavity is used in cooperation with the inner die stamping core (8), and the second stamping die cavity is used in cooperation with the outer die stamping core (9).