Metal forming press die

Abstract

The present application relates to the technical field of stamping die, especially relates to a metal forming stamping die, which comprises a die base, the middle of the top of the die base is fixedly connected with a lower die seat, the top of the die base is provided with a liftable upper die seat, the bottom of the upper die seat is fixedly connected with an upper die in the middle, a concave die groove is arranged in the top of the lower die seat, rotary downward pressing cylinders are arranged at the four corners of the top of the lower die seat, and a liftable downward pressing support is arranged in the middle of the bottom of the concave die groove, wherein the downward pressing support and the linkage mechanism are arranged, in the stamping forming process, when the downward pressing support moves downward with the plate, the linkage mechanism drives the pressing column to gradually press the plate blank close to the upper surface area of the concave die groove, the design can effectively control the material inflow amount of the plate into the concave die groove, reduce the plate stretching amount at the corner position of the groove, effectively inhibit the cracking phenomenon of the plate in the stamping process, and improve the product forming quality.

Description

Technical Field

[0001] This invention relates to the field of stamping die technology, and more particularly to a metal forming stamping die. Background Technology

[0002] In the field of metal sheet stamping and grooving, it is often necessary to use stamping dies to press and form groove structures on the surface of flat blanks in one go to meet the needs of sheet reinforcement, assembly positioning and other applications. Most existing stamping and grooving dies adopt fixed pressing structure or independent cylinder pressing structure, which still have many defects in actual processing.

[0003] Traditional pressing structures mostly use constant pressure pressing, and the pressing force cannot be adaptively adjusted with the stamping stroke. In the process of forming the groove of the sheet metal, if the pressing force is too large in the early stage of forming, it will directly lock the sheet metal, causing the material at the corner of the groove to be unable to flow normally, resulting in concentrated bending and tensile strain, which is very easy to cause corner cracking defects. If the pressing force is too small, the sheet metal will rush into the groove of the concave mold without restraint in the middle and later stages of forming. The sheet metal in the groove area is instantly overstretched, which is also easy to cause quality problems such as cracks and tears, making it difficult to meet the processing requirements of one-time forming of deep grooves and thin plates.

[0004] Therefore, how to provide a metal forming stamping die is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide a metal forming stamping die to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a metal forming stamping die, including a die base, a lower die seat fixedly connected to the top center of the die base, a liftable upper die seat provided on the top of the die base, an upper die fixedly connected to the bottom center of the upper die seat, a concave mold groove opened in the top of the lower die seat, a rotary pressing cylinder provided at the four corners of the top of the lower die seat, a liftable pressing support provided in the bottom center of the concave mold groove, a rotatable rotating flap provided on the top of the lower die seat outside the rotary pressing cylinder, a pressing column fixedly connected to the rotating flap near the concave mold groove, the rotating flap and the pressing support are connected by a linkage mechanism, when the pressing support is pressed down, the rotating flap is driven to rotate by the linkage mechanism and the pressing column is pressed against the top surface of the lower die seat.

[0007] Furthermore, the linkage mechanism includes a movable cavity, which is located in the middle of the bottom of the lower mold base. A spring is fixedly connected to the middle of the bottom of the movable cavity, and the top of the spring is fixedly connected to the bottom of the lower support member.

[0008] Furthermore, the linkage mechanism also includes an L-shaped cavity, which is opened inside the lower mold base and is connected to the movable cavity. A sliding extrusion rod is slidably connected to the side of the L-shaped cavity near the movable cavity. A wedge-shaped sliding block is fixedly connected to the other end of the sliding extrusion rod. A second spring is fixedly connected to the outside of the wedge-shaped sliding block on the outside of the sliding extrusion rod. The other end of the second spring is fixedly connected to the inner wall of the movable cavity.

[0009] Furthermore, the linkage mechanism also includes at least one ball bearing, which is disposed inside the L-shaped cavity. When the sliding extrusion rod moves, it can extrude the ball bearing. A protective sleeve is fixedly connected to the top of the lower mold base above the L-shaped cavity. A lifting rod is slidably connected to the middle of the protective sleeve. The lower end of the lifting rod passes through the middle of the protective sleeve and extends into the L-shaped cavity. The ball bearing can be pushed by the sliding extrusion rod and push the lower end of the lifting rod upward.

[0010] Furthermore, the linkage mechanism also includes a rotating connecting block, which is fixedly connected to the top of the lifting rod. Both ends of the rotating connecting block are rotatably connected to a telescopic frame. The top of the telescopic frame is fixedly connected to the rotating flap. The top of the lower mold base is fixedly connected to a positioning frame. Both ends of the rotating flap are rotatably connected to the inner side of the positioning frame.

[0011] Furthermore, the lower side of the pressing support penetrates the middle of the guide ring and extends to the bottom of the guide ring. When the pressing support moves down to the top of the guide ring, the top of the pressing support and the bottom of the concave mold groove are on the same plane. The bottom of the pressing support is disc-shaped and the bottom corners are arc surfaces.

[0012] Furthermore, the side of the wedge-shaped sliding block closest to the spring is inclined, and the bottom of the pressing support member slides in contact with the inclined surface of the wedge-shaped sliding block.

[0013] Furthermore, a limiting disc is provided at the bottom of the lifting rod, and the sliding extrusion rod extends into the L-shaped cavity and contacts the ball bearings.

[0014] Furthermore, it also includes a driven mechanism, which consists of a pressing support, a movable cavity, a guide ring, a spring one, a sliding pressing rod, a wedge-shaped sliding block, and a spring two; Furthermore, it also includes an extrusion mechanism, which consists of an L-shaped cavity, ball bearings, a lifting rod, a protective sleeve, a rotating connecting block, a telescopic frame, a rotating flap, a pressure column, and a positioning frame.

[0015] The beneficial effects of this invention are: 1. The present invention, by setting up a pressing support and a linkage mechanism, during the stamping process, when the pressing support moves down with the sheet metal, the linkage mechanism drives the pressing column to gradually press the upper surface area of ​​the blank near the concave mold groove. This design can effectively control the amount of material flowing into the concave mold groove from the sheet metal, significantly reduce the amount of sheet metal stretching at the corner of the groove, thereby effectively suppressing the cracking phenomenon of the sheet metal during the stamping process and improving the product forming quality; 2. In this invention, the initial positioning of the blank is achieved by pre-pressing the edge of the blank with a rotating pressing cylinder. Combined with the progressive pressing of the pressing column on the upper surface of the blank during the forming process, the double constraint effectively reduces the axial movement of the blank during the stamping process, ensures the accuracy of the stamping position, and improves the dimensional accuracy of the finished product. 3. In this invention, the linkage mechanism uses a wedge-shaped sliding block that cooperates with the bottom arc surface of the pressing support to smoothly convert the vertical displacement of the pressing support into a horizontal displacement, and then converts it into a vertical thrust through the ball bearings and lifting rod. The clamping force is gradually increased according to the downward stroke of the pressing support, so as to achieve adaptive pressing with the forming depth and avoid cracking of the plate due to local stress concentration caused by excessive instantaneous pressure. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of a metal forming stamping die proposed in this invention; Figure 2 This is a schematic diagram of the rotating pressing cylinder of a metal forming stamping die proposed in this invention. Figure 3 This is a front view of the cross-sectional structure of the movable cavity of a metal forming stamping die proposed in this invention; Figure 4 This is an enlarged schematic diagram of the two springs in a metal forming stamping die proposed in this invention; Figure 5 This is an enlarged structural diagram of the ball bearing section of a metal forming stamping die proposed in this invention; Figure 6 This is an enlarged structural diagram of the telescopic frame of a metal forming stamping die proposed in this invention.

[0017] In the diagram: 1. Mold base; 2. Upper mold base; 3. Lower mold base; 4. Upper mold; 5. Rotary pressing cylinder; 6. Concave mold groove; 7. Driven mechanism; 701. Downward support component; 702. Movable cavity; 703. Guide ring; 704. Spring 1; 705. Sliding compression rod; 706. Wedge-shaped sliding block; 707. Spring 2; 8. Extrusion mechanism; 801, L-shaped cavity; 802, ball bearing; 803, lifting rod; 804, protective sleeve; 805, rotating connecting block; 806, telescopic frame; 807, rotating flap; 808, pressure column; 809, positioning frame. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0019] The following is for reference. Figures 1-6 The following describes embodiments of the present invention.

[0020] The present invention provides a possible embodiment to address the problem raised. In one aspect, a metal forming stamping die is provided, including a die base 1, a lower die base 3 fixedly connected to the top center of the die base 1, a liftable upper die base 2 provided on the top of the die base 1, an upper die 4 fixedly connected to the bottom center of the upper die base 2, a concave die groove 6 opened in the top of the lower die base 3, rotary pressing cylinders 5 provided at the four corners of the top of the lower die base 3, a liftable pressing support 701 provided in the bottom center of the concave die groove 6, a rotatable rotating flap 807 provided on the top of the lower die base 3 outside the rotary pressing cylinders 5, a pressing column 808 fixedly connected to the side of the rotating flap 807 near the concave die groove 6, and the rotating flap 807 and the pressing support 701 connected by a linkage mechanism. When the pressing support 701 presses down, the linkage mechanism drives the rotating flap 807 to rotate and causes the pressing column 808 to press against the top surface of the lower die base 3.

[0021] In this embodiment, the mold base 1 serves as the supporting foundation for the entire mold set. The upper mold base 2 drives the upper mold 4 to move downwards, stamping the metal blank placed on the upper surface of the lower mold base 3. The rotating pressing cylinder 5 pre-presses the edge of the blank. The pressing support 701 initially protrudes from the bottom of the concave mold groove 6. During the process of the upper mold 4 pressing the blank to form the groove, the pressing support 701 moves downwards synchronously under the pressure of the sheet metal until the top surface of the pressing support 701 is flush with the bottom of the concave mold groove 6. During the downward movement of the pressing support 701, the rotating flip plate 807 is driven by the linkage mechanism to rotate downwards around the positioning frame 809, so that the pressing column 808 presses the blank close to the upper surface area of ​​the concave mold groove 6. During the bending and forming process of the groove, pressure is applied to the blank, controlling the amount of material flowing into the concave mold groove 6, while reducing the amount of sheet metal stretching at the corner of the groove, suppressing stamping cracks, and reducing the axial movement of the blank during the stamping process.

[0022] In one specific embodiment, the linkage mechanism includes a movable cavity 702, which is located in the middle of the bottom of the lower mold base 3. A spring 704 is fixedly connected to the middle of the bottom of the movable cavity 702, and the top of the spring 704 is fixedly connected to the bottom of the pressing support 701.

[0023] In this embodiment, spring 704 provides an upward reset force to the lower support member 701. Before stamping, spring 704 lifts the lower support member 701 upward, so that the top surface of the lower support member 701 protrudes from the bottom of the concave mold groove 6. During stamping, the sheet metal first contacts the lower support member 701. As the upper mold 4 continues to press down, it drives the lower support member 701 downward. After stamping is completed and the upper mold 4 is raised, spring 704 pushes the lower support member 701 upward, driving the entire linkage mechanism to reset. The pressure column 808 is lifted with the rotating flip plate 807, releasing the pressure on the upper surface of the sheet metal, making it easier to remove the formed workpiece.

[0024] In one specific embodiment, the linkage mechanism further includes an L-shaped cavity 801, which is formed inside the lower mold base 3 and is connected to the movable cavity 702. A sliding extrusion rod 705 is slidably connected to the side of the L-shaped cavity 801 near the movable cavity 702. A wedge-shaped sliding block 706 is fixedly connected to the other end of the sliding extrusion rod 705. A second spring 707 is fixedly connected to the outside of the wedge-shaped sliding block 706 on the outside of the sliding extrusion rod 705. The other end of the second spring 707 is fixedly connected to the inner wall of the movable cavity 702.

[0025] In this embodiment, when the pressing support 701 moves downward, the bottom of the pressing support 701 presses against the inclined surface of the wedge-shaped sliding block 706, pushing the wedge-shaped sliding block 706 to slide horizontally along the L-shaped cavity 801. The wedge-shaped sliding block 706 drives the sliding extrusion rod 705 to move synchronously. The second spring 707 provides a reverse reset elastic force to the wedge-shaped sliding block 706. After the upper mold is lifted, the second spring 707 pulls the wedge-shaped sliding block 706 back, realizing the reset of the sliding extrusion rod 705.

[0026] In one specific embodiment, the linkage mechanism further includes at least one ball bearing 802, which is disposed inside the L-shaped cavity 801. When the sliding extrusion rod 705 moves, it can extrude the ball bearing 802. A protective sleeve 804 is fixedly connected to the top of the lower mold base 3 above the L-shaped cavity 801. A lifting rod 803 is slidably connected to the middle of the protective sleeve 804. The lower end of the lifting rod 803 passes through the middle of the protective sleeve 804 and extends into the L-shaped cavity 801. The ball bearing 802 can be pushed by the sliding extrusion rod 705 and push the lower end of the lifting rod 803 upward.

[0027] In this embodiment, the sliding extrusion rod 705 advances horizontally along the horizontal section of the L-shaped cavity 801, directly pushing the ball bearing 802. The ball bearing 802 moves vertically upward within the vertical section of the L-shaped cavity 801, applying an upward extrusion force to the lower end of the lifting rod 803, pushing the lifting rod 803 to slide vertically upward within the protective sleeve 804. The protective sleeve 804 provides vertical guidance and limit protection for the lifting rod 803, restricting the lifting rod 803 to only move vertically, avoiding horizontal deviation, and ensuring stable and reliable power transmission.

[0028] In one specific embodiment, the linkage mechanism further includes a rotating connecting block 805, which is fixedly connected to the top of the lifting rod 803. The two ends of the rotating connecting block 805 are rotatably connected to a telescopic frame 806. The top of the telescopic frame 806 is fixedly connected to a rotating flip plate 807. The top of the lower mold base 3 is fixedly connected to a positioning frame 809. The two ends of the rotating flip plate 807 are rotatably connected to the inner side of the positioning frame 809.

[0029] In this embodiment, when the lifting rod 803 moves upward, the telescopic frame 806 is pushed upward by the rotating connecting block 805, thereby raising the end of the rotating flap 807 close to the lifting rod 803. The rotating flap 807 rotates and swings with the positioning frame 809 as the lever fulcrum, causing the end of the rotating flap 807 with the pressure column 808 installed to flip downward. The lever transmission is used to realize the automatic downward pressing action, forming a stable pressing force on the surface of the slab.

[0030] In one specific embodiment, the lower side of the pressing support 701 penetrates the middle of the guide ring 703 and extends to the bottom of the guide ring 703. When the pressing support 701 moves down to the top of the guide ring 703, the top of the pressing support 701 is on the same plane as the bottom of the concave mold groove 6. The bottom of the pressing support 701 is disc-shaped and the bottom corners are arc surfaces.

[0031] In this embodiment, the guide ring 703 provides vertical guidance for the pressing support 701 to prevent the pressing support 701 from shifting during the pressing process. The bottom circular arc surface structure of the pressing support 701 can smoothly fit the inclined surface of the wedge-shaped sliding block 706 for sliding contact. After the pressing support 701 moves down to the limit position, its top surface is flush with the bottom of the concave mold groove 6, completing the groove forming support. At the same time, the linkage mechanism reaches the maximum pressing state.

[0032] In one specific embodiment, the wedge-shaped sliding block 706 has an inclined surface on the side near the spring 704, and the bottom of the pressing support 701 slides in contact with the inclined surface of the wedge-shaped sliding block 706.

[0033] In this embodiment, during the pressing process of the pressing support 701, the bottom arc surface continuously adheres to the inclined surface of the wedge-shaped sliding block 706 for sliding and squeezing, which smoothly transforms the vertical pressing displacement into the horizontal sliding displacement, realizes the smooth reversal of force transmission, and ensures that the entire linkage pressing process starts gradually and presses up step by step with the stamping stroke, avoiding excessive instantaneous pressure that could cause the plate to crack.

[0034] In one specific embodiment, a limiting disc is provided at the bottom of the lifting rod 803, and the sliding extrusion rod 705 penetrates into the L-shaped cavity 801 and contacts the ball bearing 802.

[0035] It also includes a driven mechanism 7, which consists of a pressing support 701, a movable cavity 702, a guide ring 703, a first spring 704, a sliding pressing rod 705, a wedge-shaped sliding block 706, and a second spring 707. It also includes an extrusion mechanism 8, which consists of an L-shaped cavity 801, a ball bearing 802, a lifting rod 803, a protective sleeve 804, a rotating connecting block 805, a telescopic frame 806, a rotating flap 807, a pressing column 808, and a positioning frame 809.

[0036] Working principle: When the metal forming stamping die is working, the metal blank is placed on the upper end face of the lower die base 3. The rotating pressing cylinder 5 presses down the edge of the blank in advance to complete the initial positioning of the blank and suppress the large-scale movement of the blank. In the initial state, under the support of the spring 704, the top surface of the pressing support 701 protrudes from the bottom of the concave mold groove 6. During the stamping stage, the upper die holder 2 drives the upper die 4 to move downward. The upper die 4 extrudes the metal blank. The blank first contacts the lower support 701. As the upper die 4 continues to press down, the sheet metal drives the lower support 701 to move downward in sync. During the downward movement of the downward support member 701, its bottom arc surface continuously presses against the inclined surface of the wedge-shaped sliding block 706, converting the vertical downward displacement of the downward support member 701 into the horizontal displacement of the wedge-shaped sliding block 706. The wedge-shaped sliding block 706 drives the sliding extrusion rod 705 to advance horizontally forward along the horizontal section of the L-shaped cavity 801. The end of the sliding extrusion rod 705 pushes the ball bearing 802, and the ball bearing 802 moves horizontally in the L-shaped cavity. The vertical section of the cavity 801 moves vertically upward, pushing the lifting rod 803 upward. Under the guidance and constraint of the protective sleeve 804, the lifting rod 803 slides vertically upward. As the lifting rod 803 moves upward, it pushes the telescopic frame 806 upward through the rotating connecting block 805. The telescopic frame 806 drives the rotating flap 807 to lift the end near the lifting rod 803 upward. The rotating flap 807 rotates and swings with the positioning frame 809 as the lever fulcrum, causing the end of the rotating flap 807 with the pressure column 808 installed to flip downward. The pressure column 808 gradually presses the blank close to the upper surface of the concave mold groove 6. The entire linkage action gradually builds up the clamping force following the downward stroke of the pressing support 701, realizing adaptive pressure with the forming depth, controlling the amount of material flowing into the concave mold groove 6, reducing the stretching of the blank at the corner of the groove, effectively suppressing the cracking of the blank during the stamping process, and constraining the blank to reduce axial movement. When the pressing support 701 moves down to the top position of the guide ring 703, the top surface of the pressing support 701 is flush with the bottom of the concave mold groove 6, the pressing support 701 stops moving down, the linkage mechanism reaches the maximum pressing state, and the groove forming is completed. After stamping is completed, the upper die holder 2 drives the upper die 4 to rise, the pressure on the sheet metal acting on the lower support 701 disappears, the spring 1 704 pushes the lower support 701 upward to reset, at the same time the spring 2 707 pulls the wedge-shaped sliding block 706 and the sliding extrusion rod 705 to retract in the opposite direction, the ball 802 and the lifting rod 803 reset in sequence, the rotating flip plate 807 rotates in the opposite direction, the pressure column 808 is lifted, the pressure on the blank is released, and the formed workpiece can be taken out.

[0037] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A metal forming stamping die, comprising a die base (1), wherein a lower die base (3) is fixedly connected to the top center of the die base (1), and a liftable upper die base (2) is provided on the top of the die base (1), wherein an upper die (4) is fixedly connected to the bottom center of the upper die base (2), characterized in that: The lower mold base (3) has a concave mold groove (6) at the top. The four corners of the top of the lower mold base (3) are provided with rotary pressing cylinders (5). The bottom center of the concave mold groove (6) is provided with a liftable pressing support (701). The top of the lower mold base (3) is provided with a rotatable rotating flap (807) outside the rotary pressing cylinder (5). The rotating flap (807) is fixedly connected to a pressing column (808) on the side of the rotating flap (807) near the concave mold groove (6). The rotating flap (807) and the pressing support (701) are connected by a linkage mechanism. When the pressing support (701) presses down, the linkage mechanism drives the rotating flap (807) to rotate and causes the pressing column (808) to press against the top surface of the lower mold base (3).

2. The metal forming stamping die according to claim 1, characterized in that: The linkage mechanism includes a movable cavity (702), which is located in the middle of the bottom of the lower mold base (3). A spring (704) is fixedly connected to the middle of the bottom of the movable cavity (702), and the top of the spring (704) is fixedly connected to the bottom of the lower support member (701).

3. The metal forming stamping die according to claim 2, characterized in that: The linkage mechanism also includes an L-shaped cavity (801), which is located inside the lower mold base (3). The L-shaped cavity (801) is connected to the movable cavity (702). A sliding extrusion rod (705) is slidably connected to the side of the L-shaped cavity (801) near the movable cavity (702). A wedge-shaped sliding block (706) is fixedly connected to the other end of the sliding extrusion rod (705). A second spring (707) is fixedly connected to the outside of the wedge-shaped sliding block (706) on the outside of the sliding extrusion rod (705). The other end of the second spring (707) is fixedly connected to the inner wall of the movable cavity (702).

4. A metal forming stamping die according to claim 3, characterized in that: The linkage mechanism also includes at least one ball bearing (802), which is disposed inside the L-shaped cavity (801). When the sliding extrusion rod (705) moves, it can extrude the ball bearing (802). The top of the lower mold base (3) is fixedly connected to a protective sleeve (804) above the L-shaped cavity (801). A lifting rod (803) is slidably connected to the middle of the protective sleeve (804). The lower end of the lifting rod (803) passes through the middle of the protective sleeve (804) and extends into the L-shaped cavity (801). The ball bearing (802) can be pushed by the sliding extrusion rod (705) and push the lower end of the lifting rod (803) upward.

5. A metal forming stamping die according to claim 4, characterized in that: The linkage mechanism also includes a rotating connecting block (805), which is fixedly connected to the top of the lifting rod (803). The two ends of the rotating connecting block (805) are rotatably connected to a telescopic frame (806). The top of the telescopic frame (806) is fixedly connected to a rotating flip plate (807). The top of the lower mold base (3) is fixedly connected to a positioning frame (809). The two ends of the rotating flip plate (807) are rotatably connected to the inner side of the positioning frame (809).

6. A metal forming stamping die according to claim 5, characterized in that: The lower side of the pressing support (701) passes through the middle of the guide ring (703) and extends to the bottom of the guide ring (703). When the pressing support (701) moves down to the top of the guide ring (703), the top of the pressing support (701) and the bottom of the concave mold groove (6) are on the same plane. The bottom of the pressing support (701) is disc-shaped and the bottom corners are arc surfaces.

7. A metal forming stamping die according to claim 6, characterized in that: The wedge-shaped sliding block (706) has an inclined surface on the side near the spring (704), and the bottom of the pressing support (701) slides in contact with the inclined surface of the wedge-shaped sliding block (706).

8. A metal forming stamping die according to claim 7, characterized in that: The bottom of the lifting rod (803) is provided with a limiting disc, and the sliding extrusion rod (705) penetrates into the L-shaped cavity (801) and contacts the ball (802).

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