A rapid prototyping mold

Abstract

The present invention relates to the field of mold groups, and specifically to a rapid prototyping mold. It includes a frame, an upper mold, a lower mold and a demoulding device, and the demoulding device includes a push-out structure, and the push-out structure includes a push-out support rod, a push-out swing rod, a push-out column, a push-out spring and a limit assembly. When the mold is stamped, the push-out short rod and the push-out long rod form a lever structure, and the downward movement speed of the upper end of the push-out long rod is greater than the upward movement speed of the lower end of the push-out short rod, and the downward movement speed of the push-out column is greater than the downward movement speed of the lower mold, and the push-out column does not affect the stamping during mold stamping. After the mold stamping is completed, when the buffer spring resets to make the lower mold move up, the upward movement speed of the push-out column is greater than the upward movement speed of the lower mold, and when the lower mold moves up to the bottom wall of the buffer cavity without limiting the rotation of the push-out swing rod, the push-out spring quickly releases force and quickly pushes the push-out column and pushes the workpiece away from the lower mold. While improving work efficiency, it ensures the yield rate of workpieces and promotes the development of intelligent manufacturing industry production.

Description

Technical Field

[0001] The invention relates to the field of mold sets, and in particular to a rapid prototyping mold. Background Art

[0002] Instruments are a general term for instruments that display numerical values, including pressure instruments, flow meters, water meters, and various analytical instruments. The accurately displayed measurement data is an important reference in the production process of the intelligent manufacturing industry. Molds are often required in the manufacturing process of instrument shells. The working process of mold pressing of existing instrument shells is to place the raw material in the mold cavity, and then the lower protrusion of the upper template is extended into the groove of the lower template to complete the mold closing. After the mold closing, the upper and lower templates are placed between the workbench and the upper platen of the press, and the upper mold is lowered to press the lower mold to form it.

[0003] Existing instrument molds, such as a rapid prototyping instrument mold provided by China Patent Publication No. CN208879504U, have a recoil cavity below the lower mold, and buffer springs are provided in the recoil cavity between the lower mold and the lower side, which effectively avoids rigid collision of the instrument mold during pressing and increases the service life of the mold. However, the demoulding process after pressing is relatively cumbersome, which affects the working efficiency of the instrument mold during pressing.

[0004] The information disclosed in the background technology section of this application is only intended to deepen the understanding of the general background technology of this application, and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. Summary of the invention

[0005] The invention provides a rapid prototyping die to solve the problem that the pressing process of the instrument die is complicated and affects the working efficiency.

[0006] A rapid prototyping mold of the present invention adopts the following technical scheme: a rapid prototyping mold, comprising a frame, an upper mold, a lower mold and a demoulding device. An operating table is provided at the lower part of the frame. A buffer cavity is provided at the upper end of the operating table. The upper mold is provided on the frame so as to be movable up and down and is located above the operating table. The lower mold is provided in the buffer cavity so as to be movable up and down. A buffer spring is provided between the lower mold and the operating table.

[0007] The demoulding device is arranged in the buffer cavity, and includes an ejection structure. The ejection structure includes an ejection support rod, an ejection swing rod, an ejection column, an ejection spring and a limit assembly. The ejection column is vertically arranged and can be slid up and down in the lower mold, and can extend upward from the upper end surface of the lower mold. The ejection support rod is vertically arranged in the buffer cavity, and the upper end is fixed on the lower end surface of the lower mold. The ejection swing rod is inclined in the up and down directions. The middle part of the ejection swing rod is hinged to the lower end of the ejection support rod, and the hinge point divides the ejection swing rod into an ejection short rod part and an ejection long rod part. The length of the ejection short rod part is shorter than that of the ejection long rod part, and the ejection short rod part is below the ejection long rod part. The lower end of the ejection short rod part is set at a preset distance from the bottom wall of the buffer cavity. The ejection long rod part is a telescopic rod, and the upper end is hinged to the lower end of the ejection column. The ejection spring is arranged in the buffer cavity, and the upper end is connected to the lower end of the ejection column, and the lower end is connected to the bottom wall of the buffer cavity. The limit assembly is arranged above the long ejection rod portion, and is configured so that when the buffer spring drives the lower die to move upward, the short ejection rod portion abuts against the bottom wall of the buffer cavity so that the ejection spring slowly releases its force, and the ejection column moves upward by a preset distance to lift the workpiece, the limit assembly limits the release of the ejection spring, and when the lower die moves upward to a position where the bottom wall of the buffer cavity does not limit the rotation of the ejection rocker arm, the limit on the ejection spring is released, so that the ejection spring quickly releases its force and quickly pushes the ejection column and ejects the workpiece out of the lower die.

[0008] Furthermore, the limiting assembly includes a protrusion and a limiting spring. The protrusion is arranged between the push-out long rod and the push-out support rod. The protrusion can be horizontally slidably mounted on the lower end of the lower mold. The limiting spring is arranged between the protrusion and the lower mold, one end of which is connected to the protrusion and the other end is connected to the lower mold. The end of the protrusion close to the push-out long rod is arc-shaped.

[0009] Furthermore, the demoulding device also includes a biased top structure. The biased top structure is arranged between the lower mold and the bottom wall of the buffer cavity, and includes a biased top column and a locking assembly. The biased top column is vertically arranged and can be slid up and down in the lower mold, and can extend upward from the upper end surface of the lower mold. The locking assembly is used to make the biased top column cooperate with the ejection column to push the workpiece away from the lower mold by a preset distance and then no longer extend when the ejection spring slowly releases force to make the ejection column move up a preset distance to lift the workpiece, so that when the ejection spring quickly releases force to eject the workpiece from the lower mold, the bottom of the workpiece is unevenly stressed and ejects in a preset direction.

[0010] Furthermore, the lower die is provided with a vertically arranged top hole, which is a through hole, and the locking assembly is a locking ring, which is coaxially fixed to the upper end of the inner peripheral wall of the top hole.

[0011] The top column can be telescopically arranged, including a mother column and a child column. The mother column is arranged vertically and can slide up and down in the top hole. The child column can be slidably inserted in the mother column. And the diameter of the child column is larger than the diameter of the inner circumferential wall of the clamping ring. A reset spring is arranged between the child column and the mother column. A push rod is arranged at the upper end of the child column, and the diameter of the push rod is smaller than the diameter of the inner circumferential wall of the clamping ring. The top structure also includes a top support rod, a top swing rod and a top spring. The top support rod is arranged vertically in the buffer cavity, and the upper end is fixed on the lower end surface of the lower mold. The top swing rod is inclined in the up and down direction. The middle part of the top swing rod is hinged to the lower end of the top support rod, and the hinge point divides the top swing rod into a top short rod part and a top long rod part. The length of the top short rod part is shorter than the length of the top long rod part, and the top short rod part is below the top long rod part. The lower end of the top short rod part is set at a preset distance from the bottom wall of the buffer cavity. The top-biased long rod is a telescopic rod, the upper end of which is hinged with the lower end of the mother column. The top-biased spring is arranged in the buffer cavity, the upper end of which is connected with the lower end of the top-biased column, and the lower end of which is connected with the bottom wall of the buffer cavity.

[0012] Further, two ejection structures are provided, and one top structure is provided. The top structure and the two ejection structures are evenly distributed along the axis of the lower mold.

[0013] Furthermore, a plurality of guide columns are arranged between the upper die and the operating table. The plurality of guide columns are evenly distributed along the outer side of the lower die. The guide columns are arranged vertically, with the upper end fixed to the upper die and the lower end fixed to the operating table.

[0014] Furthermore, a plurality of positioning pins are arranged on the upper end surface of the lower die, and the plurality of positioning pins are evenly distributed along the axis of the lower die, and are used to limit the position of the workpiece to be processed.

[0015] Furthermore, a mounting plate is fixedly mounted on the upper end of the frame. The upper die is mounted on the lower end of the mounting plate so as to be movable up and down. A power box is mounted on the upper end of the mounting plate. A hydraulic cylinder is arranged in the power box, and a piston rod of the hydraulic cylinder is fixedly connected to the lower die.

[0016] Furthermore, circular plates are symmetrically connected at both ends of the lower die. Two slide grooves are arranged on the operating table. The two slide grooves are symmetrically arranged on both sides of the buffer cavity. The circular plate is slidably installed in the slide groove. The buffer spring is arranged in the slide groove, one end of which is connected to the circular plate, and the other end is connected to the bottom wall of the slide groove.

[0017] Further, the lower end of the ejection column is fixedly connected to a first force-bearing disk through a connecting rod. The first force-bearing disk is arranged between the lower die and the ejection spring, and is connected to the upper end of the ejection spring. The lower end of the mother column is fixedly connected to a second force-bearing disk through a connecting rod. The second force-bearing disk is arranged between the lower die and the biased top spring, and is connected to the upper end of the biased top spring.

[0018] The beneficial effects of the present invention are as follows: when the processing die of the present invention is used for stamping a workpiece, the short push rod and the long push rod of the push rod constitute a lever structure, and when the upper die presses the workpiece downward and pushes the lower die downward and compresses the buffer spring, the short push rod moves downward for a distance, and the lower end presses against the bottom wall of the buffer cavity. As the lower die moves downward, the short push rod rotates upward around the hinge point, and the short push rod rotates downward around the hinge point. Since the length of the short push rod is shorter than the length of the long push rod, the downward movement speed of the upper end of the long push rod is greater than the upward movement speed of the lower end of the short push rod at the same time, and the downward movement speed of the push rod is greater than the downward movement speed of the lower die, and the push rod does not affect the stamping when the upper die moves downward. When the upper die leaves the lower die, the buffer spring resets to make the lower die move upward, and the upward movement speed of the push rod is greater than the upward movement speed of the lower die, and in the process of the push rod and the bottom wall of the buffer cavity abutting, the push spring slowly releases force to make the push rod extend a preset length to lift the workpiece, and at this time, the limit assembly and the bottom wall of the buffer cavity limit the release of the push spring. When the lower die moves up to the position where the bottom wall of the buffer cavity does not restrict the rotation of the ejection swing rod, the ejection spring releases force to release the limit of the ejection spring by the limit assembly, so that the ejection spring quickly releases force and quickly pushes the ejection column and ejects the workpiece from the lower die. While improving work efficiency, it ensures the yield rate of workpieces and promotes the development of intelligent manufacturing industry production.

[0019] Furthermore, if the length of the short rod portion of the top is shorter than that of the long rod portion of the top, when the lower die moves upward, similar to the movement of the ejection structure, the mother rod and the sub-rod move upward at a speed greater than the lower die moving upward, so that the sub-rod extends and cooperates with the ejection column to push the workpiece away from the lower die by a certain distance. Because the sub-rod of the top column and the retaining ring cooperate with each other, the sub-rod no longer extends after rising a certain distance. When the lower die moves up to the position where the bottom wall of the buffer cavity does not limit the rotation of the ejection swing rod, the ejection spring quickly releases force after overcoming the limit spring to quickly push the ejection column and act on the bottom of the workpiece. Since the sub-rod no longer extends, the bottom of the workpiece is unevenly stressed. Then, under the cooperation of the sub-rod and the ejection column, the workpiece is ejected from the lower die in a preset direction, which is convenient for quickly replacing the workpiece to be stamped and improves work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 It is a structural schematic diagram of an embodiment of a rapid prototyping mold of the present invention;

[0022] Figure 2 A top view of an embodiment of the present invention;

[0023] Figure 3 for Figure 2 Sectional view at AA in the middle;

[0024] Figure 4 for Figure 2 Sectional view at the middle BB;

[0025] Figure 5 for Figure 4 The enlarged view of point A in the middle;

[0026] Figure 6 for Figure 2 Sectional view at CC;

[0027] Figure 7 for Figure 6 The enlarged view of point B in the middle;

[0028] Figure 8 An exploded view of an embodiment of the present invention;

[0029] Fig. 9 A schematic diagram of the structure of the push-out structure of an embodiment of the present invention;

[0030] Fig.10 It is a structural schematic diagram of the top-biased structure of an embodiment of the present invention;

[0031] In the figure: 100, frame; 110, operating table; 111, buffer chamber; 120, guide column; 130, mounting plate; 140, power box; 200, upper die; 300, lower die; 310, positioning pin; 320, buffer spring; 400, ejection structure; 410, ejection support rod; 420, ejection swing rod; 421, ejection short rod; 422, ejection long rod; 430, ejection column; 440, ejection spring; 450, bump; 460, limit spring; 500, top-biased structure; 510, top-biased column; 511, mother column; 512, child column; 520, reset spring; 530, retaining ring; 540, top-biased support rod; 550, top-biased swing rod; 560, top-biased spring. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0033] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the accompanying drawings, which 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 therefore cannot be understood as a limitation to the present invention.

[0034] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature. An embodiment of a rapid prototyping mold of the present invention, such as Figures 1 to 10 As shown: A rapid prototyping mold includes a frame 100, an upper mold 200, a lower mold 300 and a demoulding device. An operating table 110 is provided at the lower part of the frame 100. A buffer cavity 111 is provided at the upper end of the operating table 110. The upper mold 200 is provided on the frame 100 and is above the operating table 110 so as to be movable up and down. The lower mold 300 is provided in the buffer cavity 111 so as to be movable up and down. A buffer spring 320 is provided between the lower mold 300 and the operating table 110.

[0035] The demoulding device is arranged in the buffer cavity 111, and includes an ejection structure 400. The ejection structure 400 includes an ejection support rod 410, an ejection swing rod 420, an ejection column 430, an ejection spring 440 and a limit assembly. The ejection column 430 is vertically arranged and slidably arranged in the lower mold 300, and can extend upward from the upper end surface of the lower mold 300. The ejection support rod 410 is vertically arranged in the buffer cavity 111, and the upper end is fixed to the lower end surface of the lower mold 300.

[0036] The push-out swing rod 420 is tilted in the up-down direction. The middle part of the push-out swing rod 420 is hinged to the lower end of the push-out support rod 410, and the hinge point divides the push-out swing rod 420 into a push-out short rod portion 421 and a push-out long rod portion 422. The length of the push-out short rod portion 421 is shorter than the length of the push-out long rod portion 422, and the push-out short rod portion 421 is below the push-out long rod portion 422. The lower end of the push-out short rod portion 421 is set at a preset distance from the bottom wall of the buffer chamber 111. The push-out long rod portion 422 is a telescopic rod, and the upper end is hinged to the lower end of the push-out column 430. The push-out spring 440 is arranged in the buffer chamber 111, and the upper end is connected to the lower end of the push-out column 430, and the lower end is connected to the bottom wall of the buffer chamber 111.

[0037] The limiting assembly is disposed above the long ejection rod 422, and is configured such that when the buffer spring 320 drives the lower mold 300 to move upward, the short ejection rod 421 abuts against the bottom wall of the buffer cavity 111 to allow the ejection spring 440 to slowly release its force, and the ejection column 430 moves up a preset distance to lift the workpiece, the limiting assembly limits the release of the ejection spring 440, and when the lower mold 300 moves up to a position where the bottom wall of the buffer cavity 111 does not limit the rotation of the ejection rocker arm 420, the limit on the ejection spring 440 is released, so that the ejection spring 440 quickly releases its force and quickly pushes the ejection column 430 and ejects the workpiece out of the lower mold 300. When the mold is stamped, the short push rod 421 and the long push rod 422 form a lever structure, and the upper end of the long push rod 422 moves downward faster than the lower end of the short push rod 421 moves upward, and the push rod 430 moves downward faster than the lower mold 300, so the push rod 430 does not affect the stamping when the mold is stamped. After the mold stamping is completed, when the buffer spring 320 is reset to make the lower mold 300 move upward, the push rod 430 moves upward faster than the lower mold 300, and when the lower mold 300 moves upward to the position where the bottom wall of the buffer cavity 111 does not restrict the rotation of the push rod 420, the push spring 440 quickly releases force and quickly pushes the push rod 430 and pushes the workpiece away from the lower mold 300. While improving work efficiency, the yield rate of the workpiece is guaranteed.

[0038] In this embodiment, the limiting assembly includes a protrusion 450 and a limiting spring 460. The protrusion 450 is arranged between the ejection long rod portion 422 and the ejection support rod 410. The protrusion 450 can be horizontally slidably installed at the lower end of the lower mold 300. The limiting spring 460 is arranged between the protrusion 450 and the lower mold 300, with one end connected to the protrusion 450 and the other end connected to the lower mold 300. The end of the protrusion 450 close to the ejection long rod portion 422 is arc-shaped, which is used for the ejection long rod portion 422 to press the arc portion of the protrusion 450 when the ejection spring 440 quickly releases the force, and push the protrusion 450 into the lower mold 300.

[0039] In this embodiment, the demoulding device further includes a biased top structure 500. The biased top structure is disposed between the lower mold 300 and the bottom wall of the buffer cavity 111, and includes a biased top column 510 and a locking assembly. The biased top column 510 is vertically disposed and can be slid up and down in the lower mold 300, and can extend upward from the upper end surface of the lower mold 300. The locking assembly is used to make the biased top column 510 cooperate with the ejection column 430 to push the workpiece away from the lower mold 300 by a preset distance when the ejection spring 440 slowly releases force to make the ejection column 430 move up a preset distance to lift the workpiece, and then no longer extend, so that when the ejection spring 440 quickly releases force to eject the workpiece from the lower mold 300, the bottom of the workpiece is unevenly stressed and ejects in a preset direction, so as to increase the speed of replacing the workpiece and improve efficiency.

[0040] In this embodiment, a vertically arranged top hole is provided on the lower mold 300. The top hole is a through hole. The locking assembly is a locking ring 530. The locking ring 530 is coaxially fixed to the upper end of the inner circumferential wall of the top hole. The top column 510 is telescopically arranged, including a mother column 511 and a child column 512. The mother column 511 is vertically arranged and can be slid up and down in the top hole. The child column 512 can be slidably inserted in the mother column 511. And the diameter of the child column 512 is larger than the diameter of the inner circumferential wall of the retaining ring. A reset spring 520 is provided between the child column 512 and the mother column 511. A push rod is provided at the upper end of the child column 512, and the diameter of the push rod is smaller than the diameter of the inner circumferential wall of the retaining ring.

[0041] The top structure 500 also includes a top support rod 540, a top swing rod 550 and a top spring 560. The top support rod 540 is vertically arranged in the buffer cavity 111, and the upper end is fixed on the lower end surface of the lower mold 300. The top swing rod 550 is tilted in the up and down direction. The middle part of the top swing rod 550 is hinged to the lower end of the top support rod 540, and the hinge point divides the top swing rod 550 into a top short rod part and a top long rod part. The length of the top short rod part is shorter than the length of the top long rod part, and the top short rod part is below the top long rod part. The lower end of the top short rod part is set at a preset distance from the bottom wall of the buffer cavity 111. The top long rod part is a telescopic rod, and the upper end is hinged to the lower end of the mother column 511. The top spring 560 is arranged in the buffer cavity 111, and the upper end is connected to the lower end of the top column 510, and the lower end is connected to the bottom wall of the buffer cavity 111. The length of the short rod portion of the top is shorter than that of the long rod portion of the top. When the lower mold 300 moves upward, similar to the movement of the ejection structure 400, the mother rod and the sub-rod move upward at a speed greater than the speed of the lower mold 300, so that the sub-rod extends out and cooperates with the ejection column 430 to push the workpiece away from the lower mold 300 by a certain distance. Because of the limited cooperation between the sub-rod of the top column 510 and the stop ring 530, the sub-rod does not extend out after rising a certain distance.

[0042] In this embodiment, two ejection structures 400 are provided and one biased top structure 500 is provided. The biased top structure 500 and the two ejection structures 400 are evenly distributed along the axis of the lower mold 300, so as to make the lower part of the workpiece receive uneven thrust and leave the lower mold 300 in a preset direction.

[0043] In this embodiment, a plurality of guide posts 120 are provided between the upper die 200 and the operating table 110. The plurality of guide posts 120 are evenly distributed along the outer side of the lower die 300. The guide posts 120 are vertically arranged, with the upper end fixed to the upper die 200 and the lower end fixed to the operating table 110. This is used to avoid the influence on the workpiece processing yield rate caused by the misalignment of the upper and lower dies 300.

[0044] In this embodiment, a plurality of positioning pins 310 are provided on the upper end surface of the lower die 300. The plurality of positioning pins 310 are evenly distributed along the axis of the lower die 300 and are used to limit the position of the workpiece to be processed to prevent the workpiece from shifting during the stamping process.

[0045] In this embodiment, a mounting plate 130 is fixedly mounted on the upper end of the frame 100. The upper mold 200 is mounted on the lower end of the mounting plate 130 so as to be movable up and down. A power box 140 is mounted on the upper end of the mounting plate 130. A hydraulic cylinder is arranged in the power box 140, and a piston rod of the hydraulic cylinder is fixedly connected to the lower mold 300, so as to provide power for the upper mold 200 to press downward.

[0046] In this embodiment, the lower mold 300 is symmetrically connected to circular plates at both ends. Two slide grooves are provided on the operating table 110. The two slide grooves are symmetrically arranged on both sides of the buffer cavity 111. The circular plate is slidably installed in the slide groove. The buffer spring 320 is arranged in the slide groove, one end of which is connected to the circular plate, and the other end is connected to the bottom wall of the slide groove, and the slide groove is connected to the buffer cavity 111, so that the buffer spring 320 can be more stably extended and retracted in the slide groove.

[0047] In this embodiment, the lower end of the ejection column 430 is fixedly connected to a first force plate through a connecting rod. The first force plate is arranged between the lower die 300 and the ejection spring 440, and is connected to the upper end of the ejection spring 440. The lower end of the mother column 511 is fixedly connected to a second force plate through a connecting rod. The second force plate is arranged between the lower die 300 and the bias spring 560, and is connected to the upper end of the bias spring 560, and is used to make the bias spring 560 release force more stable.

[0048] In combination with the above embodiments, the use principle and working process of the present invention are as follows: when in use, the power box 140 drives the upper mold 200 to move down to press the workpiece. After the upper mold 200 abuts the workpiece, it pushes the lower mold 300 to move down in the buffer cavity 111. When the upper mold 200 presses the workpiece and pushes the lower mold 300 to move down and compresses the buffer spring 320, the push-out short rod 421 moves down a distance, and the lower end presses against the bottom wall of the buffer cavity 111. As the lower mold 300 moves down, the bottom wall of the buffer cavity 111 drives the push-out short rod 421 to rotate upward around the hinge point, and the push-out short rod 421 drives the push-out column 430 to rotate downward around the hinge point, and the upward movement distance of the lower end of the push-out short rod 421 is the downward movement distance of the lower mold 300. Since the length of the ejection short rod 421 is shorter than the length of the ejection long rod 422, the downward movement speed of the upper end of the ejection long rod 422 is greater than the upward movement speed of the lower end of the ejection short rod 421, that is, the downward movement speed of the ejection column 430 is greater than the downward movement speed of the lower die 300. Therefore, when the upper die 200 moves downward, the ejection column 430 does not affect the stamping of the workpiece by the upper die 200. When the upper die 200 leaves the lower die 300, the buffer spring 320 resets to make the lower die 300 move upward, and the upward movement speed of the ejection column 430 is greater than the upward movement speed of the lower die 300. When the ejection spring 440 releases the force, the ejection column 430 extends out of the upper surface of the lower die 300 to push the workpiece away from the lower die 300. In this process, the release of the ejection spring 440 is divided into two stages. The first stage is the stage of slow release of the force. When the lower die 300 initially moves upward, the short rod 421 abuts against the bottom wall of the buffer chamber 111, and in this stage, since the bottom wall of the buffer chamber 111 limits and decelerates the rotation of the short rod 421, the ejection spring 440 slowly releases force, so that the ejection column 430 extends a preset length to push the workpiece out a certain distance, and then the ejection long rod 422 is stopped by the protrusion 450 during the rotation of the ejection support rod 410. The second stage is the stage of rapid release of force by the ejection spring 440. When the lower die 300 continues to move upward until the bottom wall of the buffer chamber 111 no longer hinders the rotation of the ejection short rod 421, that is, when the bottom wall of the buffer chamber 111 no longer hinders the ejection spring 440 from releasing force, the ejection spring 440 pushes the ejection long rod 422 to press against the protrusion 450 and overcomes the limit spring 460 to quickly release force and quickly push the ejection column 430 to eject the workpiece out of the lower die 300. While improving work efficiency, the yield rate of the workpiece is guaranteed.

[0049] Furthermore, the length of the short rod portion on the top is shorter than the length of the long rod portion on the top. When the lower mold 300 initially moves upward, during the process of the short rod portion 421 abutting against the bottom wall of the buffer cavity 111, similar to the movement of the ejection structure 400, the upward movement speed of the mother rod with the child rod is greater than the upward movement speed of the lower mold 300, so that the child rod extends out and cooperates with the ejection column 430 to push the workpiece away from the lower mold 300 by a certain distance. Because of the limiting cooperation between the sub-rod of the biased top column 510 and the retaining ring 530, the sub-rod no longer extends out after rising a certain distance. When the lower mold 300 moves up to the position where the bottom wall of the buffer chamber 111 does not restrict the rotation of the ejection rocker rod 420, the ejection spring 440 quickly releases the force after overcoming the limiting spring 460, so that the ejection spring 440 quickly releases the force to quickly push the ejection column 430 and act on the bottom of the workpiece. Since the sub-rod no longer extends out, the bottom of the workpiece is unevenly stressed. Under the cooperation of the sub-rod and the ejection column 430, the workpiece is ejected out of the lower mold 300 in a preset direction, which facilitates the rapid replacement of the workpiece to be stamped and improves work efficiency.

[0050] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0051] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A rapid prototyping mold, characterized in that: It includes a frame, an upper mold, a lower mold and a demoulding device; An operating table is provided at the lower part of the frame, and a buffer chamber is provided at the upper end of the operating table; The upper die is arranged on the frame so as to be movable up and down, and the upper die is located above the operating table; The lower die is arranged in the buffer cavity so as to be movable up and down; a buffer spring is arranged between the lower die and the operating table; The demoulding device is arranged in the buffer cavity, and the demoulding device comprises a pushing structure, and the pushing structure comprises a pushing support rod, a pushing swing rod, a pushing column, a pushing spring and a limit assembly; The ejection column is vertically arranged and slidably arranged in the lower mold, and the ejection column can extend upwardly out of the upper end surface of the lower mold; The push-out support rod is vertically arranged in the buffer cavity, and the upper end of the push-out support rod is fixed on the lower end surface of the lower die; The push-out swing rod is tilted; the middle part of the push-out swing rod is hinged at the lower end of the push-out support rod, and the hinge point divides the push-out swing rod into a push-out short rod part and a push-out long rod part; the length of the push-out short rod part is shorter than the length of the push-out long rod part, and the push-out short rod part is below the push-out long rod part; the lower end of the push-out short rod part is set at a preset distance from the bottom wall of the buffer cavity; the push-out long rod part is a telescopic rod, and the upper end of the push-out long rod part is hinged to the lower end of the push-out column; The ejection spring is arranged in the buffer cavity, the upper end of which is connected to the lower end of the ejection column, and the lower end of which is connected to the bottom wall of the buffer cavity; The limit assembly is arranged above the ejection long rod, and the buffer spring drives the lower die to move upward, and the ejection short rod abuts against the bottom wall of the buffer cavity to release the force of the ejection spring, and after the ejection column moves upward to lift the workpiece, the limit assembly limits the release of the ejection spring, and when the lower die moves upward to a position where the bottom wall of the buffer cavity does not limit the rotation of the ejection swing rod, the limit on the ejection spring is released, so that the ejection spring quickly releases the force and quickly pushes the ejection column and ejects the workpiece out of the lower die; The limit assembly includes a protrusion and a limit spring; the protrusion is arranged between the push-out long rod and the push-out support rod; the protrusion can be horizontally slidably installed at the lower end of the lower die; the limit spring is arranged between the protrusion and the lower die, one end of which is connected to the protrusion and the other end is connected to the lower die; the end of the protrusion close to the push-out long rod is in an arc shape; The demolding device also includes a biased top structure; the biased top structure is arranged between the lower mold and the bottom wall of the buffer cavity, including a biased top column and a locking assembly, the biased top column is vertically arranged and can be slid up and down in the lower mold, and can extend upward from the upper end surface of the lower mold; the locking assembly is used to make the biased top column cooperate with the ejection column to push the workpiece away from the lower mold by a preset distance and no longer extend when the ejection spring slowly releases force to make the ejection column move up a preset distance to lift the workpiece, so that when the ejection spring quickly releases force to eject the workpiece out of the lower mold, the bottom of the workpiece is unevenly stressed and pops out in a preset direction.

2. A rapid prototyping mold according to claim 1, characterized in that: The lower die is provided with a vertically arranged top hole; the top hole is a through hole; the locking assembly is a locking ring; the locking ring is coaxially fixed to the upper end of the inner peripheral wall of the top hole; The top column can be telescopically arranged, and includes a mother column and a child column; the mother column is arranged vertically and can be slid up and down in the top hole; the child column can be slidably inserted in the mother column; and the diameter of the child column is larger than the diameter of the inner circumferential wall of the clamp ring; a reset spring is arranged between the child column and the mother column; a push rod is arranged at the upper end of the child column, and the diameter of the push rod is smaller than the diameter of the inner circumferential wall of the clamp ring; The biased top structure also includes a biased top support rod, a biased top swing rod and a biased top spring; The top support rod is vertically arranged in the buffer cavity, and the upper end is fixed on the lower end surface of the lower die; The top-biased swing rod is tilted in the up-down direction; the middle part of the top-biased swing rod is hinged at the lower end of the top-biased support rod, and the hinge point divides the top-biased swing rod into a top-biased short rod part and a top-biased long rod part; the length of the top-biased short rod part is shorter than that of the top-biased long rod part, and the top-biased short rod part is located below the top-biased long rod part; the lower end of the top-biased short rod part is set at a preset distance from the bottom wall of the buffer cavity; the top-biased long rod part is a telescopic rod, and the upper end of which is hinged to the lower end of the mother column; The biased top spring is arranged in the buffer cavity, the upper end of which is connected to the lower end of the biased top column, and the lower end of which is connected to the bottom wall of the buffer cavity.

3. A rapid prototyping mold according to claim 2, characterized in that: There are two ejection structures and one biased top structure; the biased top structure and the two ejection structures are evenly distributed along the axis of the lower mold.

4. A rapid prototyping mold according to any one of claims 1 to 3, characterized in that: A plurality of guide columns are arranged between the upper die and the operating table; the plurality of guide columns are evenly distributed along the outer side of the lower die; the guide columns are arranged vertically, the upper ends of the guide columns are fixed to the upper die, and the lower ends of the guide columns are fixed to the operating table.

5. The rapid prototyping mold according to claim 1, characterized in that: A plurality of positioning pins are arranged on the upper end surface of the lower die; the plurality of positioning pins are evenly distributed along the axis of the lower die and are used to limit the position of the workpiece to be processed.

6. A rapid prototyping mold according to claim 1, characterized in that: A mounting plate is fixedly mounted on the upper end of the frame; an upper die is movably mounted on the lower end of the mounting plate; a power box is mounted on the upper end of the mounting plate; a hydraulic cylinder is arranged in the power box, and a piston rod of the hydraulic cylinder is fixedly connected to the lower die.

7. A rapid prototyping mold according to claim 1, characterized in that: The two ends of the lower die are symmetrically connected with circular plates; two slide grooves are arranged on the operating table; the two slide grooves are symmetrically arranged on both sides of the buffer cavity; the circular plate is slidably installed in the slide groove; the buffer spring is arranged in the slide groove, one end of which is connected to the circular plate, and the other end is connected to the bottom wall of the slide groove.

8. The rapid prototyping mold according to claim 1, characterized in that: The lower end of the ejection column is fixedly connected to the first force plate through a connecting rod; the first force plate is arranged between the lower die and the ejection spring, and is connected to the upper end of the ejection spring; the lower end of the mother column is fixedly connected to the second force plate through a connecting rod; the second force plate is arranged between the lower die and the biased top spring, and is connected to the upper end of the biased top spring.

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