Liquid filling forming method and mold for metal sealing ring

Abstract

The invention discloses a liquid-filling forming method and a liquid-filling forming die for a metal sealing ring, and the liquid-filling forming die comprises a lower cushion plate, a lower cushion plate, a lower cushion plate and an upper cushion plate, the mold core is fixedly arranged at the top of the lower base plate and comprises a core seat and a core column, and a mold core cavity is formed in the top end of the core column; the lower die sleeves the bottom of the core column; the mold withdrawing assembly is arranged in the mold hole, and the top end of the mold withdrawing assembly penetrates through the core seat and extends to the lower mold; the upper backing plate is arranged above the die core, and the bottom surface of the upper backing plate is fixedly provided with a die punch corresponding to the die core cavity; the upper die is fixedly arranged on the bottom surface of the upper base plate and located on the periphery of the die punch; and the outer die sleeves the periphery of the upper die, and the top end of the outer die is connected with the upper base plate. The liquid medium is used for replacing a male die for expansion, the forming procedure is simplified, the machining efficiency is improved, and the surface quality of a formed part is high.

Description

Technical Field

[0001] The invention relates to the technical field of metal sealing ring processing, and in particular to a liquid filling molding method and a mold for a metal sealing ring. Background Art

[0002] like Figure 6 The metal sealing ring shown is an annular structure and is a key component used for sealing in liquid and gas environments. It is widely used in key industries such as aviation, aerospace, and nuclear industry. Its operating environment is usually complex working conditions such as high temperature, high pressure, and corrosive environment. Its main function is to ensure the sealing of the fluid and prevent leakage. Therefore, this type of product has high requirements on sealing performance, rebound performance, fatigue life, etc.

[0003] The cross-sectional diameter of the metal sealing ring is only a few millimeters, and the wall thickness is only 0.2 to 0.3 mm. It is a precision thin-walled part, so it is difficult to process. The existing processing technology usually uses laser welding after rolling the seamless tube, and the whole is processed through processes such as fine grinding, grinding, and polishing. The raw materials need to be customized seamless tubes, which has high procurement costs. In addition, the stress at the welding point causes the performance of the weld and the parent material to be inconsistent, affecting its overall service life. Other existing processing technologies are generally formed through multiple processes such as stamping and bending molds. The forming process is generally 10 to 12 steps. In the actual processing process, there are problems such as difficulty in removing parts and complex mold operation. It is difficult to achieve mechanized production, so the production efficiency is extremely low, and the number of molds and tooling required for parts processing is large, and the cost of parts development and small batch production is high. Summary of the invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desired to provide a liquid filling molding method and mold for a metal sealing ring, which utilizes a liquid medium instead of a punch for expansion, simplifies the molding process, improves processing efficiency, and improves the surface quality of the molded parts.

[0005] The present invention provides a liquid-filling molding die for a metal sealing ring, comprising:

[0006] A lower pad having a molded hole thereon;

[0007] The mold core comprises a core seat and a core column, wherein the core seat is fixedly arranged on the top of the lower pad and above the mold hole, the core column is fixedly arranged on the top of the core seat, a mold core cavity is opened at the top of the core column, an overflow valve is fixedly connected to one side of the core seat, and the bottom of the mold core cavity is connected to the overflow valve through an overflow channel;

[0008] The lower die is detachably slidably sleeved at the bottom of the core column, a circle of lower die grooves is formed at the top of the inner hole of the lower die, and a circle of lower mold cavities is formed at the top of the lower die grooves; a plurality of extrusion channels connected to the lower mold cavities are uniformly distributed in the mold core cavity near the bottom along the circumferential direction;

[0009] A mold-removing assembly is arranged in the mold hole, and its top end passes through the core seat and extends to the lower mold, and is used to squeeze the lower mold to move it upward and complete the mold removal;

[0010] An upper pad is arranged above the mold core, and a mold punch is fixedly arranged on the bottom surface of the upper pad corresponding to the mold core cavity;

[0011] An upper die is fixedly arranged on the bottom surface of the upper pad and located at the outer periphery of the die punch. A circle of upper die groove is formed at the bottom end of the inner hole of the upper die, and a circle of upper mold cavity is formed at the bottom end of the upper mold groove. The upper mold cavity and the lower mold cavity are combined to form a sealing ring mold cavity;

[0012] The outer mold is sleeved on the outer periphery of the upper mold, and the top end of the outer mold is connected to the upper pad.

[0013] Furthermore, the metal sealing ring at least includes a C-shaped metal sealing ring, a U-shaped metal sealing ring and an Ω-shaped metal sealing ring; the cross-section of the sealing ring cavity is correspondingly C-shaped, U-shaped or Ω-shaped.

[0014] Furthermore, a circle of positioning grooves is provided on the top surface of the lower pad located at the periphery of the mold hole; a positioning step is provided at the bottom of the core seat corresponding to the positioning groove; and the core seat is fixedly connected to the lower pad by screws.

[0015] Furthermore, a first sealing ring is arranged between the core column and the lower die; a second sealing ring is arranged in the lower die groove near the bottom end; a third sealing ring is arranged in the upper die groove near the top end; a fourth sealing ring is arranged in the upper die above the upper die groove; a fifth sealing ring is arranged on the side wall of the die punch near the bottom end, and the bottom end of the die punch is located below the fifth sealing ring and has a plurality of exhaust grooves evenly distributed along the circumferential direction.

[0016] Furthermore, the mold removal assembly includes a top plate and a push rod, the top plate is arranged in the mold hole, and the core seat is provided with a plurality of countersunk holes evenly distributed on the outer periphery of the core column, the push rods are arranged in the countersunk holes, the bottom end of the push rod is threadedly connected to the top plate, and an end cap is fixedly arranged on the top end.

[0017] Furthermore, a first exhaust channel and a second exhaust channel are opened in the upper mold; one end of the first exhaust channel is connected to the top of the inner hole of the upper mold, and the other end is connected to the top of the outer wall of the upper mold; one end of the second exhaust channel is connected to the bottom surface of the upper mold, and the other end is connected to the top of the outer wall of the upper mold.

[0018] Furthermore, the outer mold is connected to the upper pad via a plurality of unloading screws, so that the outer mold can move up and down a certain distance; a plurality of supporting springs are evenly distributed along the circumferential direction between the top of the outer mold and the upper pad.

[0019] In addition, the present invention also provides a method for implementing liquid filling molding of a metal sealing ring using the above-mentioned mold, comprising the following steps:

[0020] 1) Cutting and obtaining a circular blank, and polishing and grinding the circular blank to remove burrs;

[0021] 2) Pre-drawing: drawing the circular blank to form a tube blank with one end open;

[0022] 3) Cutting the bottom of the tube to remove the bottom of the tube blank to form a tube blank with two ends open;

[0023] 4) Liquid filling and expansion;

[0024] Fix the lower pad on the lower platform of the hydraulic press, and the upper pad on the upper platform of the hydraulic press; put the tube blank on the core column, and embed the lower half of it into the lower die groove of the lower die; inject liquid medium into the core cavity, and adjust the relief pressure of the overflow valve to the preset value;

[0025] The upper platform of the hydraulic press is controlled to press downward, the lower die is embedded in the bottom end of the outer die, and the bottom end of the die punch is embedded in the die core cavity; the upper platform of the hydraulic press continues to press downward, and the pressure of the liquid medium in the die core cavity gradually increases. After the pressure of the liquid medium reaches the preset value, the excess liquid medium is discharged through the overflow valve; during the downward movement of the upper die, the high-pressure liquid medium provides pressure to the inside of the tube blank through the extrusion channel, so that the tube blank flows into the upper cavity and the lower cavity, and the top of the tube blank is pressed down by the upper die groove to fill the material, so that the tube blank gradually fits the upper cavity and the lower cavity, until the upper die and the lower die are closed, the upper cavity and the lower cavity are combined and formed on the outer periphery of the tube blank to form a sealing ring cavity, and the tube blank and the sealing ring cavity are completely fitted;

[0026] The upper platform of the hydraulic press is controlled to move upward to drive the upper pad to lift up, and then the hydraulic cylinder on the lower platform of the hydraulic press pushes up the demoulding assembly to complete demoulding and obtain a metal sealing ring with residual material;

[0027] 5) Cutting the process margin, cutting off the process margin of the metal sealing ring with the surplus material to obtain the finished metal sealing ring.

[0028] Furthermore, in the step 1), a circular blank is obtained by laser cutting using a high temperature alloy strip;

[0029] In the step 4), the preset value of the relief pressure of the overflow valve is 7-9 MPa; and the liquid medium is industrial water.

[0030] Furthermore, in the step 3), laser cutting or lathe processing is used to remove the bottom of the tube blank and remove burrs to obtain a tube blank without welds.

[0031] Compared with the prior art, the beneficial effects of the present invention are:

[0032] (1) The present invention pre-draws the tube blank, then uses a liquid-filled forming mold, and uses a liquid medium instead of a punch to expand the metal sealing ring, thereby simplifying the processing steps, effectively improving production efficiency, and reducing production costs;

[0033] (2) The present application is conducive to the realization of mechanized operation. The liquid-filling molding mold of the present application does not rely on a special liquid-filling molding machine, but can be processed using an ordinary hydraulic press, thereby avoiding the purchase of expensive special equipment and reducing the cost of using the equipment; multiple sets of molds can be installed on the hydraulic press at the same time, and multiple parts can be processed at one time, thereby greatly reducing the production cost and facilitating the mass production of such parts;

[0034] (3) During the forming process of the metal sealing ring, the mold of the present application squeezes the end face of the tube blank through the upper mold to fill the material, and at the same time cooperates with the mold punch to squeeze the liquid medium in the core cavity. The volume of the liquid medium decreases and generates pressure to form a liquid punch, which squeezes the tube blank to plastically deform and expand to fit the upper and lower cavities. At the same time, as the mold punch squeezes the core cavity, the pressure of the liquid medium increases. After the liquid medium pressure reaches the preset value, the overflow channel opens the internal valve core of the overflow valve to complete the pressure relief, ensuring that the pressure of the liquid medium in the core cavity is constant, thereby ensuring the molding quality of the parts. The mold structure of the present application is simple, and only requires a set of conventional drawing molds and a set of liquid filling molding molds of the present application to complete the molding of the metal sealing ring. The mold development cost is greatly reduced compared with the traditional molding process, and it is easy to operate and has high production and processing efficiency.

[0035] It should be understood that the contents described in the summary of the invention are not intended to limit the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0037] Figure 1 It is a schematic diagram of the cross-sectional structure of the liquid-filled molding die before molding;

[0038] Figure 2 for Figure 1 A schematic diagram of the enlarged structure at A in the middle;

[0039] Figure 3It is a schematic diagram of the cross-sectional structure of the liquid-filled molding die before molding;

[0040] Figure 4 for Figure 3 A schematic diagram of the enlarged structure at B in the middle;

[0041] Figure 5 It is a schematic diagram of the three-dimensional cross-sectional structure of the mold core, the lower mold and the upper mold;

[0042] Figure 6 It is a schematic diagram of the cross-sectional structure of a metal sealing ring;

[0043] Figure 7 It is a schematic diagram of the cross-sectional structure of the tube blank;

[0044] Figure 8 It is a schematic diagram of the cross-sectional structure of the tube blank;

[0045] Fig. 9 It is a schematic diagram of the cross-sectional structure of a metal sealing ring with excess material;

[0046] Fig.10 It is a schematic diagram of the cross-sectional structure of the drawing die before drawing;

[0047] Fig.11 This is a schematic diagram of the cross-sectional structure of the drawing die after drawing.

[0048] Numbers in the figure: 1, lower plate; 2, mold core; 3, lower mold; 4, mold removal assembly; 5, upper plate; 6, upper mold; 7, outer mold; 8, metal sealing ring; 9, drawing mold;

[0049] 11. Type hole; 12. Positioning groove; 13. Screw;

[0050] 21. core seat; 22. core column; 23. core cavity; 24. overflow valve; 25. overflow channel; 26. extrusion channel; 27. positioning step; 28. first sealing ring; 29. ​​countersunk hole;

[0051] 31. lower die groove; 32. lower die cavity; 32. second sealing ring;

[0052] 41. top plate; 42. top rod; 43. end cap;

[0053] 51. die punch; 52. fifth sealing ring; 53. exhaust groove;

[0054] 61. upper die groove; 62. upper die cavity; 63. third sealing ring; 64. fourth sealing ring; 65. first exhaust channel; 66. second exhaust channel;

[0055] 71. Unloading screw; 72. Support spring;

[0056] 81. Cylinder blank; 82. Tube blank; 83. Metal sealing ring with excess material;

[0057] 91. Bottom plate; 92. Punch; 93. Blank holder; 94. Drawing die assembly; 95. Drawing upper pad; 96. Die; 97. Unloading block; 98. Nitrogen spring; 99. Guide assembly. DETAILED DESCRIPTION

[0058] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It should also be noted that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0059] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0060] Please refer to Figures 1 to 9 , an embodiment of the present invention provides a liquid filling molding die for a metal sealing ring, comprising:

[0061] A bottom plate 1, on which a mold hole 11 is opened;

[0062] The mold core 2 includes a core seat 21 and a core column 22. The core seat 21 is fixedly arranged on the top of the lower pad 1 and is located above the mold hole 11. The core column 22 is fixedly arranged on the top of the core seat 21. A mold core cavity 23 is opened at the top of the core column 21. An overflow valve 24 is fixedly connected to one side of the core seat 21. The bottom of the mold core cavity 23 is connected to the overflow valve 24 through an overflow channel 25.

[0063] The lower die 3 is detachably slidably sleeved at the bottom of the core column 22. A circle of lower die grooves 31 are formed at the top of the inner hole of the lower die 3. A circle of lower mold cavities 32 are formed at the top of the lower mold grooves 31. A plurality of extrusion channels 26 connected to the lower mold cavities 32 are evenly distributed in the core mold cavity 23 near the bottom along the circumferential direction.

[0064] The die-removing assembly 4 is arranged in the die hole 11, and its top end passes through the core seat 22 and extends to the lower die 3, so as to squeeze the lower die 3 to move it upward and complete the die-removing;

[0065] The upper pad 5 is arranged above the mold core 2, and a mold punch 51 is fixedly arranged on its bottom surface corresponding to the mold core cavity 23;

[0066] The upper die 6 is fixedly arranged on the bottom surface of the upper pad 5 and is located at the outer periphery of the die punch 51. The bottom end of the inner hole of the upper die 6 is provided with a circle of upper die groove 61, and the bottom end of the upper die groove 61 is provided with a circle of upper mold cavity 62. The upper mold cavity 62 is combined with the lower mold cavity 32 to form a sealing ring mold cavity.

[0067] The outer mold 7 is sleeved on the outer circumference of the upper mold 6 , and the top end thereof is connected to the upper pad 5 .

[0068] In this embodiment, when the metal sealing ring 8 is subjected to liquid filling and expansion, the lower pad 1 is first fixedly mounted on the lower platform of the hydraulic press, and the upper pad 5 is fixedly mounted on the upper platform of the hydraulic press; the tube blank 82 is then sleeved on the core column 22, and the lower half of the tube blank is embedded in the lower die groove 31 of the lower die 3; then, the liquid medium is injected into the core cavity 23, and the pressure relief pressure of the relief valve 24 is adjusted to a preset value, and the installation of the mold is completed;

[0069] At this time, the upper platform of the hydraulic press is controlled to be pressed downward, and the bottom end of the die punch 51 is embedded in the core cavity 23; the upper platform of the hydraulic press continues to be pressed downward, and the pressure of the liquid medium in the core cavity 23 gradually increases. After the pressure of the liquid medium reaches the preset value, the excess liquid medium is discharged through the overflow valve 24; during the downward movement of the upper die 6, the high-pressure liquid medium provides pressure to the inside of the tube blank 82 through the extrusion channel 26, so that the tube blank flows into the upper cavity 62 and the lower cavity 32, and the sum of the depths of the upper die groove 61 and the lower die groove 31 in the vertical direction is less than the height H of the tube blank 82. The upper die groove 61 presses down on the top of the tube blank 82 to fill the material, so that the tube blank 82 gradually fits the upper cavity 62 and the lower cavity 32, until the upper die 6 and the lower die 3 are molded, the upper cavity 62 and the lower cavity 32 are combined and formed on the outer periphery of the tube blank 82 to form a sealing ring cavity, the tube blank 82 is completely fitted with the sealing ring cavity, and the metal sealing ring 8 is bulged.

[0070] The liquid-filled forming mold of the present application utilizes liquid medium instead of a convex mold for expansion, thereby simplifying the forming process, improving processing efficiency, and achieving high surface quality of the formed parts.

[0071] In a preferred embodiment, the metal sealing ring 8 at least includes a C-shaped metal sealing ring, a U-shaped metal sealing ring and an Ω-shaped metal sealing ring; the cross section of the sealing ring cavity is correspondingly C-shaped, U-shaped or Ω-shaped.

[0072] In this embodiment, the corresponding upper cavity 62 and lower cavity 32 are processed and formed according to the structure of the metal sealing ring 8, so that the upper cavity 62 and the lower cavity 32 are assembled to form a corresponding C-shape, U-shape or Ω-shape, which can meet the processing requirements of various metal sealing rings 8.

[0073] In a preferred embodiment, if Figure 1 and Figure 5 As shown, the top surface of the lower pad 1 is provided with a circle of positioning grooves 12 at the periphery of the mold hole 11; the bottom of the core seat 21 is provided with a positioning step 27 corresponding to the positioning grooves 12; the core seat 21 is fixedly connected to the lower pad 13 by screws 13. It ensures that the mold core 2 is accurately fixedly installed on the lower pad 1, and the installation is convenient and the fixation is stable.

[0074] In a preferred embodiment, if Figure 2 As shown, a first sealing ring 28 is arranged between the core column 22 and the lower mold 3; a circle of second sealing ring 33 is arranged near the bottom end in the lower mold groove 31; a circle of third sealing ring 63 is arranged near the top end in the upper mold groove 61; a circle of fourth sealing ring 64 is arranged above the upper mold groove 61 in the upper mold 6; a circle of fifth sealing ring 52 is arranged near the bottom end of the side wall of the mold punch 51, and the bottom end of the mold punch 51 is located below the fifth sealing ring 52 and has a plurality of exhaust grooves 53 evenly distributed along the circumferential direction.

[0075] In this embodiment, each sealing ring is installed in the corresponding annular groove respectively, and the first sealing ring 28, the second sealing ring 33, the third sealing ring 63 and the fourth sealing ring 64 form a seal for the tube blank 82, and the sealing effect is good, ensuring the liquid filling molding of the metal sealing ring 8.

[0076] The fifth sealing ring 52 forms a seal between the mold punch 51 and the core cavity 23, ensuring that the mold punch 51 effectively squeezes the liquid medium for pressurization; before the fifth sealing ring 52 forms a seal, the air and liquid medium at the top of the core cavity 23 are discharged through the exhaust grooves 53; when the fifth sealing ring 52 forms a seal, the upper film groove 61 just presses on the top of the tube blank 82, ensuring that the pressurization of the liquid medium and the replenishment of the tube blank 82 are carried out simultaneously.

[0077] In a preferred embodiment, if Figure 1 As shown, the mold removal assembly 4 includes a top plate 41 and a push rod 42. The top plate 41 is arranged in the mold hole 11. A plurality of countersunk holes 29 are evenly distributed on the outer periphery of the core column 22 on the core seat 21. The push rods 42 are arranged in the countersunk holes 29. The bottom end of the push rod 42 is threadedly connected to the top plate 41, and an end cap 43 is fixedly arranged on the top end.

[0078] In this embodiment, after the metal sealing ring 8 is filled with liquid for molding, the upper pad 5 is lifted along with the upper platform of the hydraulic press. At this time, the hydraulic cylinder on the lower platform of the hydraulic press pushes the top plate 41 upward, and the top plate 41 pushes the lower mold 3 upward through the push rods 42, and the lower mold 3 pushes the metal sealing ring 83 with the remaining material upward until the metal sealing ring 83 with the remaining material is separated from the top of the core column 22, and the demoulding is completed, realizing the automatic demoulding of the parts.

[0079] In a preferred embodiment, if Figure 1 and Figure 3 As shown, a first exhaust channel 65 and a second exhaust channel 66 are opened in the upper mold 6; one end of the first exhaust channel 65 is connected to the top of the inner hole of the upper mold 6, and the other end is connected to the top of the outer wall of the upper mold 6; one end of the second exhaust channel 66 is connected to the bottom surface of the upper mold 6, and the other end is connected to the top of the outer wall of the upper mold 6.

[0080] In this embodiment, during the mold closing process of the upper mold 6 and the lower mold 3, the air between the upper mold 6 and the core column 22 can be discharged through the first exhaust channel 65; the air between the upper mold 6 and the lower mold 3 can be discharged through the second exhaust channel 66, ensuring the smooth mold closing of the upper mold 6 and the lower mold 3.

[0081] In a preferred embodiment, if Figure 1 and Figure 3 As shown, the outer mold 7 is connected to the upper pad 5 through a plurality of unloading screws 71, so that the outer mold 7 can move up and down a certain distance; a plurality of supporting springs 72 are evenly distributed along the circumferential direction between the top of the outer mold 7 and the upper pad 5.

[0082] In this embodiment, the height of the outer mold 7 is greater than the height of the upper mold 6, so that the outer mold 7 can simultaneously cover the upper mold 6 and the lower mold 3. Preferably, the height of the outer mold 7 is equal to the sum of the heights of the upper mold 6 and the lower mold 3. Before the upper mold 6 and the lower mold 3 are molded together, the outer mold 7 is first supported on the core seat 21, and at this time, the support spring 72 forms a buffer support for the upper pad 5. When the upper mold 6 is separated from the lower mold 3, the upper pad 5 is lifted, and under the elastic support of the support spring 72, the outer mold 7 and the lower mold 3 remain relatively still, avoiding the lower mold 3 from moving up with the outer mold 7, which makes it impossible for the upper mold 6 to be demolded; after the upper mold 6 moves up and demolds with the metal sealing ring 83 with excess material, the outer mold 7 moves up with the upper pad 5, ensuring the smooth demolding of the upper mold 6.

[0083] Also, please refer to Figures 1 to 9 The embodiment of the present invention further provides a method for implementing liquid filling molding of a metal sealing ring using the above-mentioned mold, comprising the following steps:

[0084] 1) Cutting: using a high-temperature alloy strip to obtain a circular blank by laser cutting, and the circular blank is polished to remove burrs;

[0085] 2) Pre-drawing, drawing the circular blank to form a tube blank 81 with one end open;

[0086] 3) Cutting the tube bottom: using laser cutting or lathing to remove the tube bottom of the tube blank 81 and remove burrs, so as to form a tube blank 82 with both ends open and without welds;

[0087] 4) Liquid filling and expansion;

[0088] Fix the lower pad 1 on the lower platform of the hydraulic press, and fix the upper pad 5 on the upper platform of the hydraulic press; put the tube blank 82 on the core column 22, and make its lower half embedded in the lower die groove 31 of the lower die 3; inject industrial water into the core cavity 23, and adjust the relief pressure of the overflow valve 24 to the preset value of 8MPa;

[0089] The upper platform of the hydraulic press is controlled to press downward, the lower die 3 is embedded in the bottom end of the outer die 7, and the bottom end of the die punch 51 is embedded in the core cavity 23; the upper platform of the hydraulic press continues to press downward, and the pressure of the industrial water in the core cavity 23 gradually increases. After the pressure of the industrial water reaches 8MPa, the excess industrial water is discharged through the overflow valve 24; during the downward movement of the upper die 6, the high-pressure industrial water provides pressure to the inside of the tube blank 82 through the extrusion channel 26, so that the tube blank 82 flows into the upper cavity 62 and the lower cavity 32, and the top of the tube blank 82 is pressed down through the upper die groove 61 to fill the material, so that the tube blank 82 gradually fits the upper cavity 62 and the lower cavity 32, until the upper die 6 and the lower die 3 are molded, the upper cavity 62 and the lower cavity 32 are combined and formed on the outer periphery of the tube blank 82 to form a sealing ring cavity, and the tube blank 82 is completely fitted with the sealing ring cavity;

[0090] The upper platform of the hydraulic press is controlled to move upward to drive the upper pad 5 to lift up, and then the hydraulic cylinder on the lower platform of the hydraulic press pushes up the demoulding assembly 4 to complete demoulding, and obtain the metal sealing ring 83 with residual material;

[0091] 5) Cutting the process margins: cutting off the process margins of the metal sealing ring 83 with the surplus material to obtain the finished metal sealing ring 8.

[0092] In this embodiment, the circular blank is made of Fig.10 and Fig.11 The drawing die shown is a deep drawing die, which consists of a base plate 91, a punch 92, a blank holder 93, a drawing backing assembly 94, a drawing upper pad 95, a die 96, a discharge block 97, a nitrogen spring 98 and a guide assembly 99.

[0093] The circular blank is placed between the punch 92 and the die 96, and the hydraulic press presses down the upper drawing pad 95. Under the action of the nitrogen spring 98, the unloading block 97 and the punch 92 press the middle part of the circular blank, and the die 96 and the pressure ring 93 drive the outer periphery of the circular blank to be drawn downward for forming.

[0094] The present application only needs to use two sets of molds, and can complete the liquid filling molding of the metal sealing ring 8 through deep drawing and liquid filling expansion, which simplifies the processing procedures, improves the processing efficiency, ensures the processing quality, and is suitable for mass production of the metal sealing ring 8.

[0095] In the description of this specification, the terms "connection", "installation", "fixation" and the like should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0096] In the description of this specification, the description of the terms "one embodiment", "some embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0097] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A liquid filling molding die for a metal sealing ring, characterized in that: include: A lower pad (1) having a molded hole (11) formed thereon; A mold core (2), comprising a core seat (21) and a core column (22), wherein the core seat (21) is fixedly arranged on the top of the lower pad (1) and is located above the mold hole (11), and the core column (22) is fixedly arranged on the top of the core seat (21), and a mold core cavity (23) is provided at the top of the core column (22), and an overflow valve (24) is fixedly connected to one side of the core seat (21), and the bottom of the mold core cavity (23) is connected to the overflow valve (26) through an overflow channel (25); The lower die (3) is detachably slidably sleeved on the bottom of the core column (22); a circle of lower die grooves (31) are formed at the top of the inner hole of the lower die (3), and a circle of lower mold cavities (32) are formed at the top of the lower mold grooves (31); a plurality of extrusion channels (26) connected to the lower mold cavities (32) are evenly distributed along the circumferential direction near the bottom of the mold core mold cavity (23); A mold removal component (4) is arranged in the mold hole (11), and its top end penetrates the core seat (21) and extends to the lower mold (3), and is used to squeeze the lower mold (3) to move it upward and complete the mold removal; An upper pad (5) is arranged above the mold core (2), and a mold punch (51) is fixedly arranged on its bottom surface corresponding to the mold core cavity (23); An upper die (6) is fixedly arranged on the bottom surface of the upper pad (5) and is located at the outer periphery of the die punch (51). A circle of upper die grooves (61) are formed at the bottom end of the inner hole of the upper die (6). A circle of upper mold cavities (62) are formed at the bottom end of the upper mold grooves (61). The upper mold cavities (62) and the lower mold cavities (32) are combined to form a sealing ring mold cavity. The outer mold (7) is sleeved on the outer periphery of the upper mold (6), and the top end of the outer mold (7) is connected to the upper pad (5).

2. The liquid filling molding die for the metal sealing ring according to claim 1, characterized in that: The metal sealing ring at least includes a C-shaped metal sealing ring, a U-shaped metal sealing ring and an Ω-shaped metal sealing ring; the cross section of the sealing ring cavity is correspondingly C-shaped, U-shaped or Ω-shaped.

3. The liquid filling molding die for the metal sealing ring according to claim 1, characterized in that: The top surface of the lower pad (1) is provided with a circle of positioning grooves (12) located at the outer periphery of the mold hole (11); the bottom of the core seat (21) is provided with positioning steps (27) corresponding to the positioning grooves (12); the core seat (21) is fixedly connected to the lower pad (1) by screws (13).

4. The liquid filling molding die for the metal sealing ring according to claim 1, characterized in that: A first sealing ring (28) is arranged between the core column (22) and the lower die (3); a circle of second sealing ring (33) is arranged near the bottom end in the lower die groove (31); a circle of third sealing ring (63) is arranged near the top end in the upper die groove (61); a circle of fourth sealing ring (64) is arranged above the upper die groove (61) in the upper die (6); a circle of fifth sealing ring (52) is arranged near the bottom end on the side wall of the die punch (51), and a plurality of exhaust grooves (53) are evenly distributed along the circumferential direction at the bottom end of the die punch (51) and located below the fifth sealing ring (52).

5. The liquid filling molding die for the metal sealing ring according to claim 1, characterized in that: The mold removal assembly (4) comprises a top plate (41) and a push rod (42); the top plate (41) is arranged in the mold hole (11); a plurality of countersunk holes (29) are evenly distributed on the outer periphery of the core column (22) on the core seat (21); the push rod (42) is arranged in each of the countersunk holes (29); the bottom end of the push rod (42) is threadedly connected to the top plate (41); and an end cap (43) is fixedly arranged on the top end.

6. The liquid filling molding die for the metal sealing ring according to claim 1, characterized in that: A first exhaust channel (65) and a second exhaust channel (66) are provided in the upper mold (6); one end of the first exhaust channel (65) is connected to the top of the inner hole of the upper mold (6), and the other end is connected to the top of the outer wall of the upper mold (6); one end of the second exhaust channel (66) is connected to the bottom surface of the upper mold (6), and the other end is connected to the top of the outer wall of the upper mold (6).

7. The liquid filling molding die for the metal sealing ring according to claim 6, characterized in that: The outer mold (7) is connected to the upper pad (5) via a plurality of unloading screws (71), so that the outer mold (7) can move up and down a certain distance; a plurality of supporting springs (72) are evenly distributed along the circumferential direction between the top of the outer mold (7) and the upper pad (5).

8. A method for liquid-filling and molding a metal sealing ring using the mold described in any one of 1 to 7, characterized in that: The steps include: 1) Cutting and obtaining a circular blank, and polishing and grinding the circular blank to remove burrs; 2) pre-drawing, drawing the circular blank to form a tube blank (81) with one end open; 3) cutting the tube bottom to remove the tube bottom of the tube blank (81) to form a tube blank (82) with two ends open; 4) Liquid filling and expansion; The lower pad (1) is fixed on the lower platform of the hydraulic press, and the upper pad (5) is fixed on the upper platform of the hydraulic press; the tube blank (82) is sleeved on the core column (22), and the lower half of the tube blank (82) is embedded in the lower die groove (31) of the lower die (3); the liquid medium is injected into the core cavity (23), and the pressure relief pressure of the overflow valve (24) is adjusted to a preset value; The upper platform of the hydraulic press is controlled to press downward, the lower die (3) is embedded in the bottom end of the outer die (7), and the bottom end of the die punch (51) is embedded in the die core cavity (23); the upper platform of the hydraulic press continues to press downward, and the pressure of the liquid medium in the die core cavity (23) gradually increases. After the pressure of the liquid medium reaches a preset value, the excess liquid medium is discharged through the overflow valve (24); during the downward movement of the upper die (6), the high-pressure liquid medium is supplied to the interior of the tube blank (82) through the extrusion channel (26). Supplying pressure to make the tube blank (82) flow into the upper cavity (62) and the lower cavity (32), and pressing down the top of the tube blank (82) through the upper die groove (61) to fill the material, so that the tube blank (82) gradually fits the upper cavity (62) and the lower cavity (32), until the upper die (6) and the lower die (3) are closed, the upper cavity (62) and the lower cavity (32) are combined and form a sealing ring cavity on the outer periphery of the tube blank (82), and the tube blank (82) and the sealing ring cavity are completely fitted; The upper platform of the hydraulic press is controlled to move upward to drive the upper pad (5) to lift up, and then the hydraulic cylinder on the lower platform of the hydraulic press pushes up the demoulding assembly (4) to complete demoulding and obtain a metal sealing ring (83) with residual material; 5) Cutting the process margins, cutting off the process margins of the metal sealing ring (83) with the excess material, and obtaining a finished metal sealing ring (8).

9. The method for liquid filling molding of a metal sealing ring according to claim 8, characterized in that: In the step 1), a circular blank is obtained by laser cutting using a high temperature alloy strip; In the step 4), the preset value of the relief pressure of the overflow valve (24) is 7-9 MPa; and the liquid medium is industrial water.

10. The method for liquid filling molding of a metal sealing ring according to claim 8, characterized in that: In the step 3), laser cutting or lathing is used to remove the bottom of the tube blank (81) and remove burrs, thereby obtaining a tube blank (82) without weld seams.

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