Double pendulum reset forming mechanism

Abstract

This application provides a double-swing block resetting and forming mechanism, including a lower mold structure, a resetting structure, and an upper mold structure. The lower mold structure includes a base, a left swing block, a right swing block, and a lower mold pressure block. The lower mold pressure block divides the T-shaped through groove inside the base into two symmetrical inverted L-shaped through grooves. The left and right swing blocks have identical and symmetrical structures and are movably disposed inside the two inverted L-shaped through grooves. The resetting structure allows the left and right swing blocks to naturally tilt outward. The upper mold structure includes an upper mold punch one and two upper mold punches two. The two upper mold punches two are symmetrically disposed on both sides of the upper mold punch one and are movably attached to it. The two upper mold punches two correspond to the left and right swing blocks respectively and can press down to push the left and right swing blocks inward toward each other until they reach a vertical state. This double-swing block resetting and forming mechanism cleverly avoids interference in the demolding direction through the swinging of the left and right swing blocks, successfully solving the demolding problem of deep cavity / box-shaped parts where an ejection mechanism cannot be installed internally.

Description

Technical Field

[0001] This application belongs to the field of terminal production technology, specifically relating to a double swing block reset forming mechanism. Background Technology

[0002] Because some products have narrow internal spaces and inverted shapes after molding, when conventional punches and ejector blocks are used to stamp the interior, they will interfere with the inner wall of the product, making it impossible for the conventional punches or ejector blocks to be smoothly pulled out from the inside of the product. Consequently, such products cannot be supported by internal parts during molding. Therefore, a double swing block resetting molding mechanism is developed to complete the molding of such products. Summary of the Invention

[0003] This application provides a double swing block resetting molding mechanism, which successfully solves the demolding problem of deep cavity / box-shaped parts where an ejection mechanism cannot be set inside.

[0004] The technical solution adopted in this application is as follows: The double-swing block resetting and forming mechanism includes a lower mold structure, a resetting structure, and an upper mold structure. The lower mold structure includes a base, a left swing block, a right swing block, and a lower mold pressing block. The base has a T-shaped through-slot that runs through its top surface, left and right sides of the top, and bottom surface. The lower mold pressing block is placed in the T-shaped through-slot, and its top is flush with the top of the base. The lower mold pressing block divides the T-shaped through-slot into two inverted L-shaped through-slots that are symmetrical to the left and right. The left swing block and the right swing block have the same structure and are symmetrical. Their lower parts are respectively movably placed inside the two inverted L-shaped through-slots through fixed shafts. The reset structure includes a reset block and a reset assembly. The reset block is movably disposed in the lower part of the T-shaped through groove of the seat body. Under the action of the reset assembly, it contacts the lower mold pressing block, the left swing block, and the right swing block respectively, causing the left swing block and the right swing block to tilt outward naturally. The upper die structure is located above the lower die structure. The upper die structure includes an upper die punch one and two upper die punches two. The two upper die punches two are symmetrically arranged on both sides of the upper die punch one and are movably attached to it. The upper die punch one is located above and corresponds to the lower die pressing block. The two upper die punches two correspond to the left swing block and the right swing block respectively, and can press down and push the left swing block and the right swing block to move closer to each other until they are in a vertical state.

[0005] Preferably, the front and rear sides of the seat are provided with positioning slots that penetrate through the top, and the positioning slots are connected to the T-shaped slots. The lower die pressing block is set in the T-shaped slot through the positioning slots.

[0006] Preferably, the left and right swing blocks are both integrally composed of a rectangular body and a reset mating part disposed below the rectangular body. The upper part of the rectangular body away from the lower die pressing block has a clearance groove that penetrates its top and front and rear side walls. An arc-shaped mating part is formed between the top surface of the rectangular body and the clearance groove. The upper part of the rectangular body near the lower die pressing block extends outward to form a forming part. The two upper die punches have downward pressure slopes formed by their opposite inner lower parts.

[0007] Preferably, the reset mating part is composed of a transition block, a rectangular block and a semicircular block connected sequentially from top to bottom. The fixed shaft is located at the lower part of the rectangular body and above the reset mating part. The top of the reset block is recessed downward to form two symmetrical driving inclined surfaces. Under the action of the reset assembly, the left and right driving inclined surfaces abut against the outer side of the semicircular block of the reset mating part of the left and right swing blocks, respectively, so that the left and right swing blocks naturally tilt outward.

[0008] Preferably, the rectangular bodies of the left and right swing blocks have weight-reducing grooves on the front and rear sides of the top of the end away from the lower die pressing block, and the weight-reducing grooves are located on the front and rear sides of the arc-shaped mating part.

[0009] Preferably, the reset assembly includes a reset spring and a force transmission rod. The reset spring is vertically disposed inside the fixed block below the seat. The lower end of the force transmission rod is disposed inside the fixed block and connected to the reset spring, while its upper end is disposed at the bottom of the reset block. Under the action of the reset spring, the reset block can cause the left and right swing blocks to tilt outward naturally.

[0010] Preferably, the lower end face of the upper die punch is any one of a convex surface, a concave surface, or a flat surface.

[0011] Compared with the prior art, the beneficial effects of this application are as follows: This double swing block reset forming mechanism cleverly avoids interference in the demolding direction by swinging the left and right swing blocks, successfully solving the demolding problem of deep cavity / box-shaped parts where an ejection mechanism cannot be set inside; through perfect time and space sequence control, that is, the closing action of the mold itself drives the left and right swing blocks to close and form the cavity; the opening action of the mold directly triggers the left and right swing blocks to open and release the product, so that the entire driving process is perfectly synchronized with the stamping press stroke, without the need for external power; at the same time, a bidirectional inclined surface drive is adopted. When closing, the downward pressing inclined surface of the two upper die punches drives the left and right swing blocks to close. When opening, the driving inclined surface of the reset block drives the left and right swing blocks to open under the action of spring force. This bidirectional inclined surface design ensures the forced, reliable and rapid action. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure in the modular state of this application.

[0013] Figure 2 This is a schematic diagram of the structure in the mold-closed state of this application.

[0014] Figure 3 This is a schematic diagram showing the disassembly of the lower mold structure.

[0015] Figure 4 for Figure 3 Top view of the central seat.

[0016] In the diagram: 1. Upper die punch one; 2. Two upper die punches two; 3. Base; 4. Left swing block; 5. Right swing block; 6. Lower die pressing block; 7. Inverted L-shaped through groove; 8. Reset block; 9. Force transmission rod; 10. Reset spring; 11. Fixed shaft; 12. Weight reduction through groove; 21. Lower pressing bevel; 31. Positioning through groove; 41. Rectangular main body; 42. Reset mating part; 43. Arc-shaped mating part; 44. Forming part; 81. Driving bevel. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this application clearer, the following description, in conjunction with specific embodiments, further clarifies this application. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this patent. It is understandable that some well-known structures and their descriptions may be omitted in the drawings for those skilled in the art.

[0018] The double-swing block resetting forming mechanism of this application is designed to address the problem that some products, after forming, have narrow internal spaces and inverted shapes, making it difficult for the punch or ejector block to be smoothly extracted from the product when using conventional punches and ejector blocks for internal stamping. The structure of some products, before forming, can be understood as consisting of a bottom, a top offset from the bottom, and outwardly flared sides connected to both sides of the bottom. Forming is the process of bringing the two sides of the product to a vertical position. In some products, the upper parts of both sides have inward bends, which can form the top part of the product after forming.

[0019] Specifically, it includes a lower mold structure, a reset structure, and an upper mold structure. The lower mold structure includes a base 3, a lower mold pressing block 6, a left swing block 4, and a right swing block 5. The base 3 has a T-shaped through-slot that runs through its top surface, the left and right sides of the top, and the bottom surface. The lower mold pressing block 6 is set in the T-shaped through-slot, with its top flush with the top of the base 3 and its lower end located at the bottom of the base 3 but not close to the bottom surface of the base. The lower mold pressing block 6 divides the T-shaped through-slot into two inverted L-shaped through-slots 7 that are symmetrical to the left and right. The left swing block 4 and the right swing block 5 have the same structure and are symmetrical. Their lower parts are respectively movably set inside the two inverted L-shaped through-slots 7 through a fixed shaft 11.

[0020] The reset structure includes a reset block 8 and a reset assembly. The reset block 8 is movably disposed at the lower part of the T-shaped through groove of the seat body. Under the action of the reset assembly, it contacts the lower die pressing block 6, the left swing block 4, and the right swing block 5 respectively, causing the left swing block 4 and the right swing block 5 to naturally tilt outward.

[0021] The upper die structure is located above the lower die structure. The upper die structure includes an upper die punch 1 and two upper die punches 2. The two upper die punches 2 are symmetrically arranged on both sides of the upper die punch 1 and are in contact with it. The upper die punch 1 is located above the lower die pressing block 6 and corresponds to the lower die pressing block 6. The two upper die punches 2 correspond to the left swing block 4 and the right swing block 5 respectively, and can press down and push the left swing block 4 and the right swing block 5 to move inward toward each other until they are in a vertical state.

[0022] The T-shaped through slots are located on the top left and right sides of the base 3, which provide space for the two upper die punches 2, ensuring that there is extra room when the upper die punches 2 press down, and at the same time limiting the front and rear directions of the upper die punches 2. The lower end of the lower die pressing block 6 is located at the lower part of the base 3 but not close to the bottom of the base, which facilitates the arrangement of the reset block 8.

[0023] Furthermore, the lower die pressing block is arranged in the seat body in such a way that the front and rear sides of the seat body 3 are provided with positioning grooves 31 that penetrate through the top of the body, and the positioning grooves 31 are connected to the T-shaped grooves. The lower die pressing block 6 is set in the T-shaped grooves through the positioning grooves 31.

[0024] Specifically, both the left and right swing blocks are integrally composed of a rectangular body 41 and a reset mating part 42 located below the rectangular body 41. A clearance groove penetrating its top and front and rear sidewalls is formed on the upper part of the rectangular body 41 away from the lower die pressing block 6. An arc-shaped mating part 43 is formed between the top surface of the rectangular body 41 and the clearance groove. A forming part 44 is formed on the upper part of the rectangular body 41 near the lower die pressing block 6 extending outwards. Two upper die punches 2 have downward-sloping, outward-facing slopes 21 on their lower inner sides. When the two upper die punches 2 press down, their downward-sloping slopes contact the arc-shaped mating part, driving the left and right swing blocks to approach and close together. In this embodiment, since the left and right sides of the product are vertical after forming, correspondingly, the rectangular bodies and forming parts of the left and right swing blocks are vertical after closing.

[0025] Furthermore, the reset mating parts 42 of the left swing block 4 and the right swing block 5 are composed of a transition block, a rectangular block and a semi-circular block connected sequentially from top to bottom. The width of the rectangular block is smaller than that of the rectangular body, and the diameter of the semi-circular block is equal to the width of the rectangular block. The fixed shaft 11 is located at the lower part of the rectangular body 41 and above the reset mating parts 42. The top of the reset block 8 is recessed downward to form two symmetrical driving inclined surfaces 81, and there is a blank area with a certain interval between the two driving inclined surfaces 81 to make concession and avoid interference. Under the action of the reset assembly, the left and right driving inclined surfaces abut against the outer side of the semi-circular block of the reset mating parts of the left and right swing blocks respectively, so that the left and right swing blocks naturally tilt outward.

[0026] The reset assembly includes a reset spring 10 and a force transmission rod 9. The reset spring 10 is vertically disposed inside the fixed block below the base 3. The lower end of the force transmission rod 9 is vertically disposed inside the fixed block and connected to the reset spring 10, while its upper end is disposed at the bottom of the reset block 8. Under the action of the reset spring, the reset block 8 allows the left and right swing blocks to naturally tilt outward. Here, the fixed block can be the lower pad and / or lower mold base of the lower mold part, or other suitable plate. The reset spring has a tendency to restore force. Under the action of the tendency to restore force, the force transmission rod rises, causing the reset block to move upward. The two driving inclined surfaces at the top of the reset block can push the semicircular blocks of the reset mating parts of the left and right swing blocks inward, that is, the two semicircular blocks move closer inward, thereby causing the upper parts of the left and right swing blocks to tilt outward.

[0027] In order to reduce the friction between the two upper die punches and the left and right swing blocks when they are pressed down, the rectangular main body 41 of the left swing block 4 and the right swing block 5 is provided with weight-reducing grooves 12 on the front and rear sides of the top of the end away from the lower die pressing block 6. The weight-reducing grooves 12 are located on the front and rear sides of the arc-shaped mating part 4. The front weight-reducing groove runs through the left side and the front side of the rectangular main body, and the rear weight-reducing groove runs through the left side and the rear side of the rectangular main body.

[0028] In this embodiment, based on the product structure, the lower end face of the upper die punch 1 can be any of a convex surface, a concave surface, or a flat surface, allowing it to mate with the top of the product to be formed. This facilitates the upper die punch's initial contact with the top of the product, achieving preliminary and precise positioning. In this embodiment, the upper die punch is a triangular convex surface composed of two symmetrical inclined surfaces, with an included angle of 150-170 degrees between the two inclined surfaces. Of course, depending on the product structure, it can be an arc-shaped convex surface, an arc-shaped concave surface, or other irregularly shaped convex or concave surfaces, or a flat surface.

[0029] A known stamping die includes an upper die portion and a lower die portion. The upper die portion includes an upper die base, an upper backing plate, an upper clamping plate, a stripper plate, etc., while the lower die portion includes, from top to bottom, an upper template, a lower die backing plate, and a lower die base. Since the upper and lower die portions differ among different stamping dies, the lower die structure and reset structure in this application are arranged in suitable positions within the lower die portion, and the upper die structure is arranged in suitable positions within the upper die portion, depending on the specific die and not limited to any particular plate.

[0030] The ingenuity of this double-swing block reset forming mechanism lies in: (1) perfect time and space sequence control: the closing action of the mold itself drives the swing blocks to close and form the cavity; the opening action of the mold directly triggers the swing blocks to open and release the product; the whole process is perfectly synchronized with the stamping press stroke, without the need for external power; (2) bidirectional inclined surface drive: closing drive: the inclined surfaces of the two upper die punches drive the swing blocks to close; opening drive: the inclined surfaces of the lower die reset block (8) drive the swing blocks to open under the action of spring force. This bidirectional inclined surface design ensures the forced, reliable and rapid action.

[0031] The double-swing block resetting molding mechanism cleverly avoids interference in the demolding direction by swinging the left and right blocks. Its application has successfully solved the global problem of demolding deep-cavity / box-shaped parts where internal ejection mechanisms cannot be installed.

[0032] The core of this double-swing block resetting molding mechanism is to solve the problems of internal product molding and demolding by using the "opening and closing" of the left and right swing blocks.

[0033] (1) First stage: mold closing and product forming Initial positioning: The product is on the top surface of the lower die pressure block. The die begins to close, and the upper die punch 1 first contacts the top of the product to achieve preliminary and accurate positioning. Drive the left and right swing blocks to close (key action): The mold continues to close, and the two upper die punches 2 press down. Their downward pressing slope 21 begins to contact and squeeze the arc-shaped mating part 43 of the left swing block 4 and the right swing block 5. Under the action of the slope force, the left swing block 4 and the right swing block 5 overcome the force of the reset structure and swing inward around the fixed axis 11 (i.e. close). Forming a closed forming cavity: When the mold is completely closed, the upper die punch 1, the closed left swing block 4, the right swing block 5, and the lower die pressing block 6 together form a closed space with four degrees of freedom. The product is precisely bent and shaped within this enclosed space, ensuring the stability and dimensional accuracy of the molding process.

[0034] (2) Second stage: mold opening and rocker block reset (key action) Upper mold disengagement: After molding is completed, the mold begins to open; the two upper mold punches 2 move upward first, and at the same time leave the lower mold left swing block 4 and right swing block 5; Inclined surface drive swing block opening (core demolding action): Once the upper mold driving force disappears, the restoring force generated by the return spring is transmitted upward through the force transmission rod 9 and acts on the drive inclined surface of the return block 8; the drive inclined surface of the return block 8 decomposes this upward force into a horizontal component force, which acts directly on the lower ends of the left swing block 4 and the right swing block 5, forcing them to swing outward around the fixed axis 11 (i.e., open). Demolding is completed: The rapid opening of the left and right swing blocks causes the forming surface to instantly detach from the side wall of the product, making room for product demolding and achieving fast and interference-free demolding.

Claims

1. A double-swing block resetting and forming mechanism, comprising a lower mold structure, a resetting structure, and an upper mold structure, characterized in that: The lower mold structure includes a base, a left swing block, a right swing block, and a lower mold pressing block. The base has a T-shaped through-slot that runs through its top surface, left and right sides of the top, and bottom surface. The lower mold pressing block is placed in the T-shaped through-slot, and its top is flush with the top of the base. The lower mold pressing block divides the T-shaped through-slot into two inverted L-shaped through-slots that are symmetrical to the left and right. The left swing block and the right swing block have the same structure and are symmetrical. Their lower parts are respectively movably placed inside the two inverted L-shaped through-slots through fixed shafts. The reset structure includes a reset block and a reset assembly. The reset block is movably disposed in the lower part of the T-shaped through groove of the seat body. Under the action of the reset assembly, it contacts the lower mold pressing block, the left swing block, and the right swing block respectively, causing the left swing block and the right swing block to tilt outward naturally. The upper die structure is located above the lower die structure. The upper die structure includes an upper die punch one and two upper die punches two. The two upper die punches two are symmetrically arranged on both sides of the upper die punch one and are movably attached to it. The upper die punch one is located above and corresponds to the lower die pressing block. The two upper die punches two correspond to the left swing block and the right swing block respectively, and can press down and push the left swing block and the right swing block to move closer to each other until they are in a vertical state.

2. The double-swing block resetting and forming mechanism according to claim 1, characterized in that: The front and rear sides of the base are provided with positioning slots that penetrate through the top of the base, and the positioning slots are connected to the T-shaped slots. The lower die pressing block is set in the T-shaped slot through the positioning slots.

3. The double-swing block resetting and forming mechanism according to claim 1, characterized in that: The left and right swing blocks are both integrally composed of a rectangular body and a reset mating part located below the rectangular body. The upper part of the rectangular body away from the lower die pressing block has a clearance groove that runs through its top and front and rear side walls. An arc-shaped mating part is formed between the top surface of the rectangular body and the clearance groove. The upper part of the rectangular body near the lower die pressing block extends outward to form a forming part. The two upper die punches have downward pressure slopes that are outward and downward on their respective inner lower parts.

4. The double-swing block resetting and forming mechanism according to claim 3, characterized in that: The reset engagement part is composed of a transition block, a rectangular block and a semicircular block connected sequentially from top to bottom. The fixed shaft is located at the lower part of the left swing block body and above the reset engagement part. The top of the reset block is recessed downward to form two symmetrical driving inclined surfaces. Under the action of the reset assembly, the left and right driving inclined surfaces abut against the outer side of the semicircular block of the reset engagement part of the left and right swing blocks respectively, so that the left and right swing blocks naturally tilt outward.

5. The double-swing block resetting and forming mechanism according to claim 3 or 4, characterized in that: The rectangular main body of the left and right swing blocks has weight-reducing grooves on the front and rear sides of the top of the end away from the lower die pressing block, and the weight-reducing grooves are located on the front and rear sides of the arc-shaped mating part.

6. The double-swing block resetting and forming mechanism according to claim 1, characterized in that: The reset assembly includes a reset spring and a force transmission rod. The reset spring is located inside the fixed block below the seat. The lower end of the force transmission rod is vertically located inside the fixed block and connected to the reset spring. Its upper end is located at the bottom of the reset block. Under the action of the reset spring, the reset block can cause the left and right swing blocks to tilt outward naturally.

7. The double-swing block resetting and forming mechanism according to claim 1, characterized in that: The lower end face of the upper die punch can be any one of a convex surface, a concave surface, or a flat surface.

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