A molding die capable of preventing product deformation

Abstract

The utility model belongs to product forming field provides a kind of forming die that can prevent product deformation, it include: fixed die seat;Moving plate and profiling block, moving plate is sleeved in profiling block, and profiling groove is formed at the circumference of profiling block, moving plate can be moved relative to profiling block, so that profiling groove and profiling block form height difference to form step ring on product;Profiling block is fixed on fixed die seat, for forming arc surface.Compared with prior art, the utility model has the advantages that relative movement between moving plate and profiling block is utilized, step ring is formed in advance before extruding arc surface, so that the area (in step ring) of plate material, which needs to be stretched to form arc surface, and non-stretching area (outside step ring) are effectively isolated and constrained, avoiding the edge of arc surface from appearing stretching, distortion and other deformation defects due to external stress during forming, improving product size precision and surface quality.

Description

Technical Field

[0001] This utility model belongs to the field of product molding, specifically relating to a molding die that can prevent product deformation. Background Technology

[0002] With the rapid development of the machinery industry, people are paying more and more attention to the molding process and the quality of products after molding.

[0003] like Figure 1 As shown, when the central area of ​​the molded product has a raised arc-shaped surface, and an annular stepped flange (i.e., stepped ring) is connected to the end of the arc-shaped surface, the current molding process for the above structure mainly relies on stamping die technology. During the stamping stroke, the main punch on the moving die simultaneously completes the deep drawing of the arc-shaped surface and the forming operation of the stepped ring. However, due to the significant height difference and geometric abrupt change between the stepped ring and the central arc-shaped surface, the arc-shaped surface is easily subjected to external stress of the sheet metal during the forming process, resulting in tensile deformation. This ultimately leads to product damage or even scrap, seriously affecting the product's molding quality and molding efficiency. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a molding die that is simple in structure, has good stability, and can ensure product molding quality and efficiency while preventing product deformation.

[0005] The objective of this utility model can be achieved by addressing the following technical problem: providing a molding die that prevents product deformation, used for molding a product with a stepped ring and an arc-shaped surface on a sheet metal, wherein the stepped ring is connected to the end of the arc-shaped surface, and the molding die includes:

[0006] Fixed mold base;

[0007] A movable plate and a contour block are provided. The movable plate is fitted onto the contour block and has a contour groove formed at the periphery of the contour block. The movable plate can move relative to the contour block so that the contour groove and the contour block form a height difference to form a stepped ring on the product. The contour block is fixed on the fixed mold base and is used to form the arc surface.

[0008] A movable mold base is movably disposed above the fixed mold base. A forming block and an extrusion block are disposed on the movable mold base. The forming block is movably pressed against the movable plate and extends into the contour groove. The extrusion block is used to extrude the plate to make it adhere tightly to the arc surface.

[0009] When the moving plate moves relative to the contour block, the stepped ring can be pre-formed, so that the plate portion located inside the stepped ring is stretched into the arc-shaped surface by the extrusion block, while the plate portion located outside the stepped ring is not stretched or deformed by the extrusion block.

[0010] In the above-mentioned molding die that can prevent product deformation, the moving mold base is also provided with an elastic element and a clamping post. One end of the clamping post is connected to the elastic element, and the other end moves through the edge of the extrusion block.

[0011] In the above-mentioned molding die that can prevent product deformation, a plurality of nitrogen springs are provided on the fixed mold base, and the top end of the nitrogen springs is connected to the movable plate.

[0012] In the above-mentioned molding die that can prevent product deformation, a first wedge and a second wedge are detachably connected inside the contour block. A protrusion is formed inside the first wedge, and the second wedge is located inside the protrusion and flush with its top wall. An annular groove is formed inside the extrusion block, and the annular groove is movably pressed against the protrusion.

[0013] In the above-mentioned molding die that can prevent product deformation, both the molding block and the extrusion block are provided with a first connecting hole, and the moving mold base is provided with a second connecting hole. When the first connecting hole and the second connecting hole are aligned and connected, they are used for fastener connection.

[0014] In the above-mentioned molding die that can prevent product deformation, a molding protrusion is detachably assembled inside the extrusion block, and a molding groove is correspondingly provided inside the contour block, and the molding protrusion is movably pressed into the molding groove.

[0015] In the above-mentioned molding die that can prevent product deformation, the fixed mold base, the movable plate and the contour block are all formed with stripping holes, and a release rod is movably arranged in the stripping hole to release the molded product outside the fixed mold base.

[0016] In the above-mentioned molding die that can prevent product deformation, a guide post penetrating the movable plate is installed on the fixed mold base, and a guide sleeve is formed inside the movable mold base, the guide sleeve being movably sleeved on the guide post.

[0017] In the above-mentioned molding die that can prevent product deformation, a first limiting post is also installed on the moving mold base, and a second limiting post is installed on the fixed mold base, with the first limiting post movably abutting against the second limiting post.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] (1) The present invention provides a molding die that can prevent product deformation. By utilizing the relative movement between the moving plate and the contour block, a stepped ring is pre-formed in front of the extruded arc surface, thereby effectively isolating and constraining the area of ​​the arc surface to be stretched and formed (inside the stepped ring) and the non-stretched area (outside the stepped ring) in the sheet material. This avoids deformation defects such as stretching and twisting at the edge of the arc surface due to external stress during molding, and improves the dimensional accuracy and surface quality of the product.

[0020] (2) Using nitrogen springs to provide stable and controllable reset force and buffering effect, the moving plate can be accurately reset after the step ring preforming is completed. At the same time, it plays a supporting and shock-absorbing role in the mold closing and opening process, and ensures the accuracy and repeatability of the height difference between the moving plate and the contour block, thereby improving the consistency and reliability of the step ring forming.

[0021] (3) The clamping column, in conjunction with the elastic element, can drive the clamping column to pre-press the edge of the sheet metal before the main forming action in the early stage of mold closing, so as to prevent the sheet metal from shifting or wrinkling during the extrusion molding process. Attached Figure Description

[0022] Figure 1 This is a structural diagram of the board material;

[0023] Figure 2 This is a schematic diagram of the moving mold base;

[0024] Figure 3 yes Figure 2 Schematic diagram of the cross section at point AA;

[0025] Figure 4 This is a schematic diagram of the fixed mold base;

[0026] Figure 5 This is an exploded view of the area between the movable platen and the fixed mold base.

[0027] In the diagram, 1 is the sheet material; 10 is the stepped ring; and 11 is the curved surface.

[0028] 2. Fixed mold base; 20. Moving plate; 200. Contouring groove; 21. Contouring block; 210. First wedge block; 210a. Protrusion block; 211. Second wedge block; 212. Forming groove; 22. Nitrogen spring; 23. Guide post; 24. Second limiting post;

[0029] 3. Moving mold base; 30. Forming block; 31. Extrusion block; 310. Annular groove; 311. Forming protrusion; 32. Elastic element; 33. Clamping post; 34. Guide sleeve; 35. First limiting post. Detailed Implementation

[0030] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0031] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0032] like Figures 1 to 5 As shown, this utility model provides a molding die that can prevent product deformation. It is used to form a product with a stepped ring 10 and an arc-shaped surface 11 on a sheet 1. The stepped ring 10 is connected to the end of the arc-shaped surface 11. The molding die includes a fixed mold base 2, a movable plate 20, a contour block 21, and a moving mold base 3.

[0033] The movable plate 20 is fitted onto the contour block 21, and a contour groove 200 is formed on the periphery of the contour block 21. The movable plate 20 can move relative to the contour block 21, so that the contour groove 200 and the contour block 21 form a height difference to form the stepped ring 10 on the product. The contour block 21 is fixed on the fixed mold base 2 and is used to form the arc surface 11. The movable mold base 3 is movably disposed above the fixed mold base 2. The movable mold base 3 is equipped with a forming block 30 and an extrusion block 31. The forming block 30 is movably pressed against the movable plate 20 and extends into the contour groove 200. The extrusion block 31 is used to extrude the sheet material 1 to make it adhere tightly to the arc surface 11. When the movable plate 20 moves relative to the contour block 21, it can pre-form the stepped ring 10, so that the part of the sheet material 1 located in the stepped ring 10 is stretched and formed into the arc surface 11 by the extrusion block 31, while the part of the sheet material 1 located outside the stepped ring 10 is not stretched and deformed by the extrusion block 31.

[0034] like Figures 1 to 5 As shown, a worker or robot can place the sheet material 1 to be processed on the fixed mold base 2, covering the top of the contour block 21 and the moving plate 20. At this time, the moving plate 20 is in its initial position, with its inner edge fitted around the outer periphery of the contour block 21. It is worth noting that at this time, the height of the contour groove 200 is close to the top wall of the contour block 21, ensuring that the sheet material 1 is placed stably. As the moving mold base 3 begins to move towards the fixed mold base 2 and enters the mold closing process, the forming block 30 on its lower surface first contacts the upper surface of the moving plate 20 and applies pressure to the moving plate 20 relative to the contour block 21 along the contour. Figure 4The downward pressing force causes the surface of the moving plate 20, which was originally flush with the contour block 21, to gradually fall below the top of the contour block 21, thus forming a stepped contour groove 200 with a preset height difference between them. At this time, the plate 1 is partially pressed into the contour groove 200 in this area, initially forming the stepped ring 10 structure. Since the extrusion block 31 has not yet fully contacted the central area of ​​the plate 1 at this stage, the arc surface 11 has not yet begun to form. The key to this preforming action is to establish a stable geometric boundary—the stepped ring 10—before the arc surface 11 is stretched. As the moving mold base 3 moves further down, the extrusion block 31 begins to contact the central area of ​​the plate 1 and applies a deforming extrusion force. At this time, the portion of the plate 1 located inside the stepped ring 10 is pushed by the extrusion block 31 and gradually conforms to the curved contour of the contour block 21, undergoing plastic stretching deformation, and finally forming the desired arc surface 11. Therefore, this embodiment, by setting a fixed contour block 21 and a movable plate 20 on the fixed mold base 2, the two cooperate to form a contour groove 200 with a height difference, which can pre-form the stepped ring 10 structure on the product. At the same time, the extrusion block 31 on the moving mold base 3 only applies extrusion to the plate 1 in the inner area of ​​the stepped ring 10 during the forming process, so that it fits the contour block 21 to complete the stretching and forming of the arc surface 11. It is precisely because of the pre-forming of the stepped ring 10 that the plate 1 in the outer area of ​​the stepped ring 10 does not participate in the extrusion deformation, avoiding material flow and stress concentration in non-target areas. This structural design realizes the progressive forming in sections and stages, effectively controls the material flow direction and deformation degree of the plate 1 during the forming process, significantly reduces defects such as product warping, springback or local cracking caused by uneven stretching, improves the product dimensional accuracy and surface quality, and solves the technical problem that traditional molds are prone to overall deformation when forming a composite structure of stepped ring 10 and arc surface 11.

[0035] Several nitrogen springs 22 are provided on the fixed mold base 2, and the top of the nitrogen springs 22 is connected to the movable plate 20.

[0036] like Figure 5 As shown, in this embodiment, multiple nitrogen springs 22 are set on the fixed mold base 2 and their top ends are connected to the moving plate 20. The nitrogen springs 22 provide stable and controllable reset force and buffering effect, ensuring that the moving plate 20 can accurately reset after the pre-forming of the stepped ring 10 is completed. At the same time, they play a supporting and shock-absorbing role during the mold closing and opening process. The nitrogen springs 22 have fast response speed, long stroke and constant pressure, which can effectively compensate for small errors in mold operation, extend mold life, and ensure the accuracy and repeatability of the height difference between the moving plate 20 and the contour block 21, thereby improving the consistency and reliability of the stepped ring 10 forming.

[0037] The moving mold base 3 is also provided with an elastic element 32 and a retaining post 33. One end of the retaining post 33 is connected to the elastic element 32, and the other end moves through the edge of the extrusion block 31.

[0038] like Figure 3 As shown, in this embodiment, an elastic element 32 and a clamping post 33 are provided in the moving mold base 3. One end of the clamping post 33 is connected to the elastic element 32, and the other end passes through the edge of the extrusion block 31. In the early stage of mold closing, the elastic force of the elastic element 32 drives the clamping post 33 to pre-press the edge of the sheet 1 before the main forming action, preventing the sheet 1 from shifting or wrinkling during the extrusion forming process. At the same time, when the mold opens, the elastic element 32 retracts, causing the clamping post 33 to disengage, facilitating the unloading operation. This structure enhances the constraint ability on the edge of the sheet 1, improves the forming stability and positioning accuracy, further reduces the risk of product deformation due to edge instability, and improves the production yield. It should be noted that the elastic element 32 in this embodiment can be replaced by other elastic devices such as compression springs and return springs.

[0039] The contour block 21 is detachably connected to a first wedge block 210 and a second wedge block 211. A protrusion block 210a is formed inside the first wedge block 210. The second wedge block 211 is located inside the protrusion block 210a and is flush with its top wall. An annular groove 310 is formed inside the extrusion block 31. The annular groove 310 is movably pressed against the protrusion block 210a.

[0040] like Figures 2 to 4 As shown, in this embodiment, the first wedge 210 and the second wedge 211 can be locked using screws or similar structures. The first wedge 210 has a protrusion 210a, and the second wedge 211 is embedded inside the protrusion 210a with its top wall flush. It works in conjunction with the annular groove 310 on the extrusion block 31 to achieve a movable pressing connection. This modular design not only facilitates local replacement and maintenance after wear, reducing repair costs, but also ensures that the quality of the molded product meets usage requirements through the precisely matched protrusion 210a and annular groove 310 structure. Furthermore, the flush top wall ensures the continuity of the molding surface, avoiding steps or misalignment, and improving the product's appearance quality and structural integrity.

[0041] Both the forming block 30 and the extrusion block 31 are provided with a first connecting hole, and the moving mold base 3 is provided with a second connecting hole. When the first connecting hole and the second connecting hole are aligned and connected, they are used for fastener connection.

[0042] In this embodiment, a first connecting hole (not shown in the figure) is opened on the molding block 30 and the extrusion block 31, and after being aligned with the second connecting hole (not shown in the figure) in the moving mold base 3, they are connected by fasteners (screws, bolts, etc.), realizing the rapid assembly and firm fixation between the functional modules. This connection method has a simple structure and is easy to disassemble and assemble, which is conducive to the daily maintenance of the mold and the replacement of parts. At the same time, the multi-point fastening design improves the rigidity and stability of the overall structure, prevents loosening or displacement during high pressure molding, and ensures molding accuracy and safety.

[0043] The extrusion block 31 is detachably fitted with a forming protrusion 311, and the contour block 21 is correspondingly provided with a forming groove 212. The forming protrusion 311 is movably pressed into the forming groove 212.

[0044] like Figures 2 to 4 As shown, this embodiment uses a structural design where the forming protrusion 311 is movably pressed into the forming groove 212 to form a closed forming cavity. This design enables precise forming of the product's feature parts, and the forming protrusion 311 is independently replaceable, facilitating quick changes in form according to different product requirements, improving mold versatility and flexible production capabilities. At the same time, the detachable structure facilitates cleaning and maintenance of accumulated debris, preventing foreign matter residue from affecting the forming quality, and ensuring product consistency and yield.

[0045] The fixed mold base 2, the movable plate 20, and the contour block 21 all have ejection holes (not shown in the figure). A release rod (not shown in the figure) is movably installed within the ejection hole to eject the molded product outside the fixed mold base 2. After the product molding is complete, the product can be pushed out of the mold by pushing the release rod, achieving automatic demolding. This demolding mechanism is reliable and distributes force evenly, avoiding scratches or deformations on the product surface caused by traditional external ejection methods. It is particularly suitable for products with complex structures and high demolding resistance, such as those with curved surfaces 11 and stepped rings 10. Simultaneously, the multiple ejection holes work together to ensure a smooth demolding process, reduce residual stress, and further prevent secondary deformation of the product during the demolding stage. It should be noted that the structural design and working principle of the ejection hole and release rod are the same as those of the existing mold's product ejection operation, and will not be described in detail here.

[0046] A guide post 23 that penetrates the movable plate 20 is installed on the fixed mold base 2, and a guide sleeve 34 is formed inside the movable mold base 3. The guide sleeve 34 is movably sleeved on the guide post 23.

[0047] like Figures 2 to 4As shown, a high-precision guiding mechanism is formed by installing a guide post 23 through the moving plate 20 on the fixed mold base 2 and setting a guide sleeve 34 that cooperates with it on the moving mold base 3. This ensures that the moving mold base 3 always maintains the alignment with the fixed mold base 2 during the up and down movement, preventing off-center loading or jamming. This guiding structure effectively guides the relative sliding between the moving plate 20 and the contour block 21, ensuring the accurate formation of the height difference of the contour groove 200 and improving the dimensional consistency of the stepped ring 10. At the same time, the stable guiding effect reduces friction loss and vibration during mold operation, extends the service life of the mold, and improves the stability and safety of equipment operation.

[0048] The moving mold base 3 is also equipped with a first limiting post 35, and the fixed mold base 2 is equipped with a second limiting post 24. The first limiting post 35 is movably pressed against the second limiting post 24.

[0049] like Figures 2 to 4 As shown, a first limiting post 35 is provided on the moving mold base 3, and a second limiting post 24 is provided on the fixed mold base 2. When the mold is closed in place, the two posts abut against each other, forming a mechanical stroke limiting structure. This limiting mechanism can precisely control the downward pressing end position of the moving mold base 3, preventing overpressure that could damage the mold or cause over-forming of the product. It also ensures the consistency of each mold closing stroke, improving forming accuracy and repeatability. Combined with the guiding function of the guide post 23 and the guide sleeve 34, the limiting posts work together to achieve a dual guarantee of "guidance + limiting," making mold operation safer and more controllable, especially suitable for stamping production lines with high precision and high automation requirements. It is worth noting that, as... Figure 1 As shown, after all features on the product are formed, there is still excess waste at the edge of the sheet 1. Therefore, the existing cutting process is required to remove the excess part of the sheet 1 in order to obtain the desired product.

[0050] It should be noted that in this invention, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly specified. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0051] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0052] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A molding die for preventing product deformation, used to form a product having a stepped ring and an arc-shaped surface on a sheet metal, wherein the stepped ring is connected to the end of the arc-shaped surface, characterized in that, The molding die includes: Fixed mold base; A movable plate and a contour block are provided. The movable plate is fitted onto the contour block and has a contour groove formed at the periphery of the contour block. The movable plate can move relative to the contour block so that the contour groove and the contour block form a height difference to form a stepped ring on the product. The contour block is fixed on the fixed mold base and is used to form the arc surface. A movable mold base is movably disposed above the fixed mold base. A forming block and an extrusion block are disposed on the movable mold base. The forming block is movably pressed against the movable plate and extends into the contour groove. The extrusion block is used to extrude the plate to make it adhere tightly to the arc surface. When the moving plate moves relative to the contour block, the stepped ring can be pre-formed, so that the plate portion located inside the stepped ring is stretched into the arc-shaped surface by the extrusion block, while the plate portion located outside the stepped ring is not stretched or deformed by the extrusion block.

2. The molding die for preventing product deformation according to claim 1, characterized in that, The moving mold base is also provided with an elastic element and a clamping post. One end of the clamping post is connected to the elastic element, and the other end moves through the edge of the extrusion block.

3. The molding die for preventing product deformation according to claim 1, characterized in that, The fixed mold base is provided with several nitrogen springs, and the top end of each nitrogen spring is connected to the movable plate.

4. A molding die for preventing product deformation according to claim 2, characterized in that, The contour block is detachably connected to a first wedge and a second wedge. A protrusion is formed inside the first wedge, and the second wedge is located inside the protrusion and flush with its top wall. An annular groove is formed inside the extrusion block, and the annular groove is movably pressed against the protrusion.

5. A molding die for preventing product deformation according to claim 4, characterized in that, Both the molding block and the extrusion block are provided with a first connecting hole, and the moving mold base is provided with a second connecting hole. When the first connecting hole and the second connecting hole are aligned and connected, they are used for fastener connection.

6. A molding die for preventing product deformation according to claim 1, characterized in that, The extrusion block is detachably fitted with a forming protrusion, and the contour block is correspondingly provided with a forming groove. The forming protrusion is movably pressed into the forming groove.

7. A molding die for preventing product deformation according to claim 1, characterized in that, The fixed mold base, the movable plate, and the contour block are all provided with ejection holes. An ejection rod is movably installed in the ejection hole to eject the molded product outside the fixed mold base.

8. A molding die for preventing product deformation according to claim 1 or 7, characterized in that, A guide post is installed on the fixed mold base, penetrating the movable plate, and a guide sleeve is formed inside the movable mold base, the guide sleeve being movably fitted onto the guide post.

9. A molding die for preventing product deformation according to claim 8, characterized in that, The moving mold base is also equipped with a first limiting post, and the fixed mold base is equipped with a second limiting post, with the first limiting post movably abutting against the second limiting post.

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