A grommet adhesive medium forming device

Abstract

The utility model relates to a kind of gasket ring adhesive medium forming devices, comprising: mould closing mechanism, it includes: upper die holder, upper die body, punch and lower die body, the upper die holder is movably arranged in one side of lower die body, the upper die body is connected to upper die holder, accommodating cavity and forming cavity are formed between the upper die body and lower die body respectively, the accommodating cavity is filled with medium;Forming mechanism, it includes: first sealing ring and second sealing ring respectively arranged in upper die body and lower die body, the first sealing ring and second sealing ring are respectively provided with first stop face and second stop face. The utility model can effectively solve the wrinkling defects caused by compressive stress in C-shaped cross-section bulging, while ensuring the geometric accuracy and increasing the material utilization.

Description

Technical Field

[0001] This utility model relates to the field of mold forming technology, and in particular to a sealing ring viscous medium forming device. Background Technology

[0002] C-shaped sealing rings are a type of metal sealing ring primarily used for sealing fluid media under high-temperature conditions, and are widely used in engines, nuclear power, and other fields. The structural features of a C-shaped sealing ring are that of an integral ring with a C-shaped cross-section and thin-walled metal structure.

[0003] During the molding process of C-shaped sealing rings, when the ring size is small, the negative angle of the C-shaped cross-section and the poor wrinkling resistance due to the small wall thickness make it difficult to mold without internal support. Furthermore, the small opening size of the C-shaped cross-section makes it impossible to remove the rigid internal support. Therefore, these sealing ring components are typically manufactured using a fluid medium bulging process. However, fluid medium bulging requires ensuring a high-pressure seal, and the thin sheet blank has a large allowance, resulting in low material utilization. Especially when using expensive materials such as high-temperature alloys, the high price of C-shaped sealing rings restricts their widespread application. Utility Model Content

[0004] Therefore, the technical problem to be solved by this utility model is to overcome the problem of low material utilization rate in the forming of C-shaped sealing rings in the prior art, thereby providing a sealing ring viscous medium forming device.

[0005] To solve the above-mentioned technical problems, this utility model provides a sealing ring viscous medium forming device, comprising:

[0006] A mold closing mechanism includes: an upper mold base, an upper mold body, a punch, and a lower mold body. The upper mold base is movably disposed on one side of the lower mold body. The upper mold body is connected to the upper mold base. A receiving cavity and a forming cavity are formed between the upper mold body and the lower mold body, respectively. The receiving cavity is filled with a medium. The punch is movably disposed in the receiving cavity. The receiving cavity and the forming cavity are connected.

[0007] A molding mechanism includes: a first sealing ring and a second sealing ring respectively disposed on an upper mold body and a lower mold body, the first sealing ring and the second sealing ring being able to fit together and form a first channel, and the first sealing ring and the second sealing ring being respectively provided with a first stop surface and a second stop surface.

[0008] In one embodiment of this utility model, the upper mold body and the lower mold body are respectively provided with a first groove and a second groove, wherein the first groove and the second groove are annular grooves with matching dimensions and both have arc-shaped cross sections.

[0009] In one embodiment of the present invention, the first groove and the second groove are joined to form a molding cavity, and the cross-sectional shape of the molding cavity is circular or elliptical.

[0010] In one embodiment of the present invention, the first groove and the second groove are respectively provided with a first stepped surface and a second stepped surface for installing the first sealing ring and the second sealing ring, and the first sealing ring and the second sealing ring are respectively provided with a first protrusion and a second protrusion that protrude from the first stepped surface and the second stepped surface and are corresponding to each other.

[0011] In one embodiment of the present invention, there are multiple first protrusions and second protrusions, and the multiple first protrusions and second protrusions are respectively arranged at intervals along the circumference of the first sealing ring and the second sealing ring, and multiple first channels are formed between the multiple first protrusions and second protrusions.

[0012] In one embodiment of this utility model, the upper mold body and the lower mold body form a second channel when the mold is closed. The second channel is connected to the first channel, the first channel is connected to the molding cavity, and the second channel is connected to the molding cavity.

[0013] In one embodiment of the present invention, a transition cavity is connected between the receiving cavity and the second channel, and the two ends of the transition cavity are respectively connected to the second channel and the receiving cavity. The height of the transition cavity gradually decreases from the forming cavity towards the second channel.

[0014] In one embodiment of this utility model, the bottom surface of the receiving cavity is at a height less than the bottom surface of the transition cavity.

[0015] In one embodiment of this utility model, the upper mold base is connected to a fixing plate, the punch is connected to the fixing plate, and the lower mold body is installed on the lower mold base.

[0016] In one embodiment of the present invention, the upper mold base has a countersunk hole extending through it along the height direction, and a connecting part is movably inserted through the countersunk hole. One end of the connecting part is connected to the upper mold body and the other end is connected to a limiting part. An elastic element is sleeved on the connecting part.

[0017] Compared with the prior art, the above-mentioned technical solution of this utility model has the following beneficial effects:

[0018] The sealing ring viscous medium forming device of this utility model utilizes the outward lateral pressure of the viscous medium during initial forming to prevent the thin-walled blank from becoming unstable and deformed randomly. It also serves to correct the shape of blanks with low roundness. Combined with the vertical pressure, it forms an inwardly bent C-shaped initial forming part using a cylindrical blank with no or little allowance. Within the same mold, based on the initial forming part, the high pressure of the viscous medium is used to bulge the forming part. While the C-shaped cross-section bulges, the annular sealing ring also bulges outward, effectively solving defects such as wrinkling caused by compressive stress during C-shaped cross-section bulging, while ensuring geometric accuracy and increasing material utilization. Attached Figure Description

[0019] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0020] Figure 1 This is a structural schematic diagram of the molding device of this utility model in the open and closed mold states;

[0021] Figure 2 This is a sectional view of the upper mold body and the lower mold body of this utility model;

[0022] Figure 3 This is a utility model Figure 2 Enlarged view of point A in the middle;

[0023] Figure 4 This is a utility model Figure 2 Enlarged view of point B in the middle;

[0024] Figure 5 This is an exploded view of the cross-sectional views of the upper and lower mold bodies of this utility model;

[0025] Figure 6 This is a utility model Figure 5 Enlarged view of point C in the middle;

[0026] Figure 7 This is a partial structural diagram of the mold closing start state of this utility model;

[0027] Figure 8 This is a partial structural diagram of the mold closing state of this utility model.

[0028] Explanation of reference numerals in the accompanying drawings: 1. Upper mold base; 2. Fixing plate; 3. Connecting part; 4. Elastic element; 5. Punch; 6. Upper mold body; 61. First step surface; 7. First sealing ring; 71. First stop surface; 72. First protrusion; 8. Second sealing ring; 81. Second stop surface; 82. Second protrusion; 9. Sealing ring to be formed; 10. Lower mold body; 101. Second step surface; 11. Forming cavity; 111. First groove; 112. Second groove; 12. Receiving cavity; 13. C-shaped sealing ring; 14. First channel; 15. Second channel; 16. Lower mold base; 17. Transition cavity. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0030] Example

[0031] Reference Figures 1-8 As shown, the sealing ring adhesive medium forming device of this utility model includes:

[0032] A mold closing mechanism includes: an upper mold base 1, an upper mold body 6, a punch 5, and a lower mold body 10. The upper mold base 1 is movably disposed on one side of the lower mold body 10. The upper mold body 6 is connected to the upper mold base 1. A receiving cavity 12 and a forming cavity 11 are formed between the upper mold body 6 and the lower mold body 10, respectively. The receiving cavity 12 is filled with a medium. The punch 5 is movably disposed in the receiving cavity 12. The receiving cavity 12 and the forming cavity 11 are connected.

[0033] The molding mechanism includes a first sealing ring 7 and a second sealing ring 8 respectively disposed on the upper mold body 6 and the lower mold body 10. The first sealing ring 7 and the second sealing ring 8 can fit together to form a first channel 14. The first sealing ring 7 and the second sealing ring 8 are respectively provided with a first stop surface 71 and a second stop surface 81.

[0034] The sealing ring viscous medium forming device of this utility model has an upper mold base 1 that is movably disposed above the lower mold body 10 along the mold closing direction. In this embodiment, it is vertical and fixedly connected to the upper mold body 6, ensuring that the upper mold body 6 moves closer to or further away from the lower mold body 10 synchronously with the upper mold base 1. The surfaces of the upper mold body 6 and the lower mold body 10 opposite each other are respectively provided with a receiving cavity 12 and a forming cavity 11: the receiving cavity 12 is used to fill the viscous medium, and the punch 5 is disposed in the receiving cavity 12 in a way that can slide along the depth direction of the receiving cavity 12. When the punch 5 moves downward, it can compress the medium in the receiving cavity 12. The forming cavity 11 is the forming space of the sealing ring to be processed, and is connected to the receiving cavity 12 through a preset connecting channel, so that the pressurized medium can flow from the receiving cavity 12 into the forming cavity 11.

[0035] Reference Figures 2-4 As shown, the molding mechanism includes a first sealing ring 7 and a second sealing ring 8, which are fixed to corresponding positions on the upper mold body 6 and the lower mold body 10, respectively, and in this embodiment, to the inner edges. When the mold is closed, the sealing surfaces of the first sealing ring 7 and the second sealing ring 8 are tightly fitted to form a sealing interface; at the same time, a first channel 14 is formed between them, serving as a path for the medium to flow to the molding cavity 11. Further, the first sealing ring 7 has a first stop surface 71 on the side facing the second sealing ring 8, and the second sealing ring 8 has a corresponding second stop surface 81. When the mold is closed, the middle part of the inner side of the sealing ring 9 to be molded is squeezed by the medium. While the medium is squeezed in the middle, it flows upward and downward along the sealing ring 9 to be molded. The medium squeezes and drives the upper and lower sides of the sealing ring 9 to be molded to undergo tensile deformation and move along the inner wall of the molding cavity 11 until the upper and lower ends of the sealing ring 9 to be molded abut against the first stop surface 71 and the second stop surface 81, respectively. The material is subjected to contact and tension is stopped, forming a C-shaped sealing ring 13. The medium continues to compress or hold the pressure for a period of time, maintaining the shape of the C-shaped sealing ring 13 and reducing the amount of rebound deformation after demolding. In this embodiment, the medium is configured as a viscous medium, thereby increasing the adhesion between the medium and the sealing ring 9 to be formed, further ensuring the stretching effect and effectively preventing the medium from leaking from the sealing ring mating surface, thus strengthening the sealing effect. While the blank is rolled and formed under the action of the upper and lower dies, it expands outward under the action of the viscous medium, gradually forming a C-shaped cross-section sealing ring.

[0036] The first stop surface 71 is formed on the first sealing ring 7 and is inclined upward and outward, and the second stop surface 81 is formed on the second sealing ring 8 and is inclined downward and outward, so as to fit the end face of the C-shaped sealing ring 13.

[0037] In this embodiment, the sealing ring 9 to be formed is a cylindrical blank with a wall thickness of 0.1 mm to 0.3 mm, a width of 5 mm to 50 mm, and an inner diameter of 10 mm to 1500 mm. It can be made of stainless steel, high-temperature alloy, or other metallic materials. The viscous medium is selected with a molecular weight of 300,000 to 1,000,000 g / mol. The sealing ring is a custom-designed structural sealing ring from Pengfang Rubber. Due to the viscoelastic properties of the viscous medium, on the one hand, the viscous flow fills the tiny gaps in the workpiece, ensuring the conformity of the contour; on the other hand, the elastic stress counteracts the rebound stress generated by tension inside the workpiece, significantly reducing the elastic rebound deformation of the C-shaped sealing ring after demolding.

[0038] Before molding, the viscous medium is filled into the receiving cavity 12; the upper mold base 1 is driven to move down to close the mold, at which time the first and second sealing rings 8 are in contact to achieve a seal around the molding cavity 11; then the punch 5 is driven to move down to squeeze the medium, and the medium flows into the molding cavity 11 through the connecting structure between the receiving cavity 12 and the molding cavity 11 and the first channel 14 under pressure until it is full; after the sealing ring is formed, the upper mold base 1 is driven to move up to open the mold and the formed C-shaped sealing ring 13 is taken out.

[0039] During the initial forming process, the outward lateral pressure of the viscous medium is used to prevent the thin-walled blank from becoming unstable and deforming randomly. At the same time, it can also play a corrective role for blanks with poor roundness. Combined with the vertical pressure, a C-shaped initial forming part with inward bending deformation is formed using a cylindrical blank with no or small allowance. In the same mold, based on the initial forming part, the high pressure of the viscous medium is used to expand the forming part. While the C-shaped section is expanding, the annular sealing ring is also expanding outward. This can effectively solve the defects such as wrinkling caused by compressive stress during the expansion of the C-shaped section, while ensuring geometric accuracy.

[0040] Reference Figure 3 As shown, the upper mold body 6 and the lower mold body 10 are respectively provided with a first groove 111 and a second groove 112. The first groove 111 and the second groove 112 are annular grooves with matched dimensions and arc-shaped cross sections. The first groove 111 is formed on the surface of the upper mold body 6 facing the lower mold body 10, and the second groove 112 is formed on the surface of the lower mold body 10 facing the upper mold body 6. Both are annular grooves that extend continuously in the circumference. The circumferential contours of the first groove 111 and the second groove 112, such as the diameter and center position, are completely consistent, and the depth and width are also matched to ensure precise docking to form a complete closed space when the molds are closed. In addition, the cross sections of both grooves are arc-shaped, and the inner surfaces of the first groove 111 and the second groove 112 are continuous curved surfaces with the same radius of curvature, ensuring a smooth surface transition. When the medium flows into the groove under pressure, the smooth curved surface reduces flow resistance, prevents the medium from stagnating at the corners or generating eddies, and ensures uniform filling. The size-adaptive design ensures the alignment accuracy of the grooves during mold closing, preventing shape distortion of the forming cavity 11 due to misalignment and guaranteeing the dimensional accuracy of the sealing ring. A movable sealing connection exists between the punch 5 and the inner wall of the receiving cavity 12.

[0041] When the first groove 111 and the second groove 112 are joined, a forming cavity 11 is formed. The cross-sectional shape of the forming cavity 11 is circular or elliptical. In this embodiment, since a C-shaped sealing ring needs to be formed, the cross-sectional shape of the first groove 111 and the second groove 112 is semi-circular. The forming cavity 11 is a closed annular space after mold closing. Its cross-sectional shape along the radial direction of the annulus is determined by the arc-shaped cross-sections of the two grooves: if the arc-shaped cross-sections of the two grooves are semi-circular, the cross-section of the forming cavity 11 is circular; if they are semi-elliptical, the cross-section of the forming cavity 11 is elliptical. A circular cross-section is a conventional design, suitable for most installation scenarios, and has the advantages of structural symmetry and uniform stress distribution. An elliptical cross-section is suitable for special spaces such as sealing ring shape requirements, where installation is required between narrow parallel surfaces. An elliptical cross-section can reduce the radial dimension and avoid surrounding components while ensuring sealing performance.

[0042] The first groove 111 and the second groove 112 are respectively provided with a first stepped surface 61 and a second stepped surface 101 for installing the first sealing ring 7 and the second sealing ring 8. The first sealing ring 7 and the second sealing ring 8 are respectively provided with a first protrusion 72 and a second protrusion 82 that protrude from the first stepped surface 61 and the second stepped surface 101 and are corresponding to each other. The first stepped surface 61 is opened at the edge of the first groove 111. The connection between the first groove 111 and the surface of the upper mold body 6 is an annular plane extending circumferentially along the first groove 111, and its size is adapted to the first sealing ring 7 to accommodate and position the first sealing ring 7. Similarly, the second stepped surface 101 is opened at the edge of the second groove 112, and its size is adapted to the second sealing ring 8 to position the second sealing ring 8. After the first sealing ring 7 is installed, a first protrusion 72 protruding from the first stepped surface 61 is provided on the side facing the second sealing ring 8; the second sealing ring 8 is correspondingly provided with a second protrusion 82 protruding from the second stepped surface 101. When the mold is closed, the two are accurately aligned and fitted together.

[0043] Reference Figures 5-6 As shown, there are multiple first protrusions 72 and second protrusions 82, which are spaced apart circumferentially along the first sealing ring 7 and the second sealing ring 8, respectively. Multiple first channels 14 are formed between the multiple first protrusions 72 and the second protrusions 82. The spaces between the first protrusions 72 and the second protrusions 82 provide channels for viscous media, ensuring smooth passage of the media. At the same time, some areas are in close contact, providing local support. When the punch 5 extrudes the media, the media flows in all directions. The multiple first channels 14 cause the media to be evenly distributed circumferentially along the forming cavity 11. Each channel corresponds to a section of the forming cavity 11, and the media flows into the corresponding area through the channel. This avoids the problem of excessively rapid local filling and insufficient filling in other areas caused by a single channel.

[0044] When the upper mold body 6 and the lower mold body 10 are closed, a second channel 15 is formed. The second channel 15 communicates with the first channel 14, which in turn communicates with the molding cavity 11. The second channel 15 is formed between the closing surfaces of the upper and lower mold bodies 10, located inside the first sealing ring 7 and the second sealing ring 8, and is a complete ring. One end of the second channel 15 communicates with the first channel 14, and the other end communicates with the molding cavity 11. After the medium flows out of the receiving cavity 12, it flows into the first channel 14 and the molding cavity 11 through the second channel 15. The second channel 15 is formed by the upper mold body 6 and the lower mold body 10 receding backward, and its cross-sectional dimension is greater than or equal to that of the first channel 14 to ensure smooth passage of the medium.

[0045] A transition cavity 17 connects the receiving cavity 12 and the second channel 15. The two ends of the transition cavity 17 are connected to the second channel 15 and the receiving cavity 12, respectively. The height of the transition cavity 17 gradually decreases from the forming cavity 11 towards the second channel 15. The height of one side of the second channel 15 is less than that of the transition cavity 17, forming a sloping or conical transition structure. The inner surface of the transition cavity 17 is a smooth curved surface, avoiding sharp edges or steps to ensure smooth flow of the medium. It also guides and pressurizes the flow.

[0046] The bottom surface of the receiving cavity 12 is at a lower height than the bottom surface of the transition cavity 17. The bottom of the receiving cavity 12 is located in the lower mold body 10, and its depth is greater than that of the transition cavity 17. This allows the medium to be contained in the bottom of the receiving cavity 12 before mold closing, and the medium can be filled until its height is aligned with that of the transition cavity 17.

[0047] Reference Figure 1 As shown, Figure 1 The left side shows a structural diagram of the mold in the open state, and the right side shows a structural diagram of the mold in the closed state. The upper mold base 1 is connected to a fixing plate 2, the punch 5 is connected to the fixing plate 2, and the lower mold body 10 is installed on the lower mold base 16. The fixing plate 2 is a rigid flat plate, fixedly connected to the lower part of the upper mold base 1. The connection method can be any one of bolts, welding, or integral molding. The upper end of the punch 5 is fixed to the fixing plate 2 or the lower part of the upper mold base 1, and the connection method ensures that the relative position of the punch 5 and the fixing plate 2 remains unchanged. The lower mold base 16 is a rigid structure, fixed to the ground or workbench. The lower mold body 10 is installed on the upper part of the lower mold base 16 by bolts, ensuring the horizontality and center position accuracy of the lower mold body 10 during installation. When the upper mold base 1 moves along the mold closing direction, the fixing plate 2 moves synchronously, driving the punch 5 to move synchronously.

[0048] The upper mold base 1 has a countersunk hole extending through its height. A connecting part 3 is movably inserted through the countersunk hole. One end of the connecting part 3 is connected to the upper mold body 6, and the other end is connected to a limiting part. An elastic element 4 is fitted onto the connecting part 3. The countersunk hole extends through the upper mold base 1 along its height and is a stepped hole, with the upper diameter larger than the lower diameter, forming a stepped hole. The connecting part 3 is a rigid rod-like structure, such as a bolt or shaft. Its lower end is fixedly connected to the upper mold body 6, such as by thread or welding. Its upper end passes through the lower diameter of the countersunk hole and connects to the limiting part, i.e., an integral head. The limiting part is larger than the lower diameter of the countersunk hole but smaller than the upper diameter, and can be locked onto the stepped surface of the countersunk hole to prevent the connecting part 3 from falling off. When the upper mold base 1 moves downward to close the mold, the upper mold base 1 presses the upper mold body 6 downward through the elastic element 4. The elastic element 4 is compressed and generates a reverse elastic force, which offsets part of the mold closing impact force and avoids direct hard contact between the upper mold body 6 and the lower mold body 10. The pre-compression force of the elastic element 4 can maintain a certain pre-tight force when the upper mold body 6 and the lower mold body 10 are closed. In this embodiment, the elastic element is a spring, which strengthens the sealing effect of the first sealing ring 7 and the second sealing ring 8 and further reduces the risk of leakage of viscous media.

[0049] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A grommet adhesive medium forming apparatus, characterized by, include: A mold closing mechanism includes: an upper mold base, an upper mold body, a punch, and a lower mold body. The upper mold base is movably disposed on one side of the lower mold body. The upper mold body is connected to the upper mold base. A receiving cavity and a forming cavity are formed between the upper mold body and the lower mold body, respectively. The receiving cavity is filled with a medium. The punch is movably disposed in the receiving cavity. The receiving cavity and the forming cavity are connected. A molding mechanism includes: a first sealing ring and a second sealing ring respectively disposed on an upper mold body and a lower mold body, the first sealing ring and the second sealing ring being able to fit together and form a first channel, and the first sealing ring and the second sealing ring being respectively provided with a first stop surface and a second stop surface.

2. A grommet adhesive medium forming device as defined in claim 1, wherein: The upper mold body and the lower mold body are respectively provided with a first groove and a second groove. The first groove and the second groove are annular grooves with matching dimensions and arc-shaped cross sections.

3. A grommet adhesive medium forming device as defined in claim 2, wherein: When the first groove and the second groove are joined together, a forming cavity is formed, and the cross-sectional shape of the forming cavity is circular or elliptical.

4. A grommet adhesive medium forming device as defined in claim 2, wherein: The first groove and the second groove are respectively provided with a first stepped surface and a second stepped surface for installing the first sealing ring and the second sealing ring. The first sealing ring and the second sealing ring are respectively provided with a first protrusion and a second protrusion that protrude from the first stepped surface and the second stepped surface and are corresponding to each other.

5. The sealing ring viscous medium forming device according to claim 4, characterized in that: There are multiple first protrusions and second protrusions, and the multiple first protrusions and second protrusions are respectively arranged at intervals along the circumference of the first sealing ring and the second sealing ring, and multiple first channels are formed between the multiple first protrusions and second protrusions.

6. The sealing ring viscous medium forming device according to claim 1, characterized in that: When the upper mold body and the lower mold body are closed, a second channel is formed. The second channel is connected to the first channel, the first channel is connected to the molding cavity, and the second channel is connected to the molding cavity.

7. The sealing ring viscous medium forming device according to claim 1, characterized in that: A transition cavity is connected between the receiving cavity and the second channel. The two ends of the transition cavity are respectively connected to the second channel and the receiving cavity. The height of the transition cavity gradually decreases from the forming cavity towards the second channel.

8. The sealing ring viscous medium forming device according to claim 1, characterized in that: The bottom surface of the receiving cavity is at a lower height than the bottom surface of the transition cavity.

9. The sealing ring viscous medium forming device according to claim 1, characterized in that: The upper mold base is connected to a fixing plate, the punch is connected to the fixing plate, and the lower mold body is installed on the lower mold base.

10. The sealing ring viscous medium forming device according to claim 1, characterized in that: The upper mold base has a countersunk hole extending through it along the height direction. A connecting part is movably inserted through the countersunk hole. One end of the connecting part is connected to the upper mold body and the other end is connected to a limiting part. An elastic element is fitted onto the connecting part.

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