Forming die, forming method and forming device for glass sintering electrode

Abstract

The invention discloses a forming mold, a forming method and a forming device of a glass sintering electrode, the forming mold comprises an upper pressing mold, a middle mold and a bottom mold, the upper pressing mold comprises a pressure-bearing part and a crimping part integrally formed at the lower end of the pressure-bearing part, and a first through hole matched with the crimping part of the upper pressing mold is formed in the middle mold; a first groove matched with the upper portion of the bottom die is formed in the bottom face of the middle die, a second through hole matched with an electrode needle of the glass sintering electrode is formed in the upper pressing die, a needle hole matched with the electrode needle of the glass sintering electrode is formed in the top face of the bottom die, and the second through hole and the needle hole are coaxially arranged. According to the invention, the processes of glass powder glue discharging, glass particle and metal electrode needle assembling and the like are reduced, the process flow is shortened, and the yield is improved while the cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of hemispherical resonant gyroscope assembly, and in particular to a forming mold and a forming device for a glass sintered electrode. Background Art

[0002] A hemispherical resonator gyroscope, also known as a resonator, is a solid-state wave gyroscope based on the Coriolis effect. It boasts high precision, long life, and high reliability, making it a key area of ​​future gyroscope development. Future applications for hemispherical resonator gyroscopes include aerospace, navigation, strategic and tactical weaponry, and many other fields.

[0003] As a key component of a hemispherical resonator gyroscope (HRG), a high Q factor is an important metric for evaluating the quality of the resonator and also influences the performance of the HRG. Operating in a vacuum environment is crucial for achieving high precision and long life. This significantly reduces the loss of energy from the resonator's vibration due to air damping. Furthermore, a vacuum suppresses vibration modal interference. Molecular collisions in the air can introduce random noise, destabilizing the four antinodes of the resonator.

[0004] Therefore, in order to ensure the long-term use of the hemispherical resonant gyroscope (including MEMS gyroscope) head in a high vacuum environment, the head is generally vacuum-sealed in a cavity composed of an excitation cover and a base. In order to ensure its sealing, the leads inside the head need to be sealed with high vacuum. At the same time, because the product requires high-temperature exhaust, thermal activation of the getter and other operations, conventional organic (glue) sealing solutions cannot be used in high-temperature environments. The head signal is generally led out through the base using an electrode needle, and the electrode needle and the base are connected by a glass sintering seal.

[0005] Vacuum packaging is an important indicator for judging the quality of the meter head, and it also affects the performance of the hemispherical resonant gyroscope. The quality of the glass sintered electrode during the assembly of the meter head will affect the meter head's vacuum degree, signal transmission performance, etc., and ultimately affect the gyroscope's core precision indicators such as zero bias stability, repeatability, noise, and scale factor stability. The traditional glass powder sintering electrode process is as follows: the glass powder needs to be mixed with an organic adhesive first, pre-formed using a traditional press, and debonded by high-temperature sintering to obtain sintered glass particles. The glass particles are then assembled with metal electrode needles, placed on the electrode base, and then co-fired at high temperature to obtain a sintered glass sintered electrode. This method has a complex preparation process and high cost. In addition, the glass powder is mixed with an organic adhesive, which inevitably introduces impurities, affecting the accuracy of the hemispherical resonant gyroscope. Summary of the Invention

[0006] In response to the problems in the background technology, the present invention proposes a forming mold and a forming device for glass sintered electrodes, which shorten the process flow, reduce costs and improve the yield rate.

[0007] The present invention adopts the following technical solutions: A forming mold for a glass sintered electrode includes an upper die, a middle die and a bottom die. The upper die includes a pressure-bearing portion and a crimping portion integrally formed at the lower end of the pressure-bearing portion. The middle die is provided with a first through hole that cooperates with the crimping portion of the upper die. The bottom surface of the middle die is provided with a first groove that cooperates with the upper portion of the bottom die. The upper die is provided with a second through hole that cooperates with the electrode needle of the glass sintered electrode. The top surface of the bottom die is provided with a pinhole that cooperates with the electrode needle of the glass sintered electrode. The second through hole and the pinhole are coaxially arranged.

[0008] Optionally, a fixing seat is further included, wherein the top surface of the fixing seat is provided with a second groove cooperating with the lower part of the bottom mold, and the bottom surface of the second groove is provided with a third groove cooperating with the pressure-bearing part of the upper mold.

[0009] Optionally, a top screw hole is provided on the bottom surface of the bottom mold, and the top screw hole extends upward to be connected with the needle hole.

[0010] Optionally, a demoulding seat is further included, and the bottom surface of the demoulding seat is provided with a fourth groove that cooperates with the pressure-bearing part of the upper die.

[0011] Optionally, a plurality of positioning pin through holes are provided on the demoulding seat, a plurality of positioning pin blind holes are provided on the bottom surface of the middle mold, and the plurality of positioning pin through holes and the plurality of positioning pin blind holes correspond to each other one by one.

[0012] As a general inventive concept, the present invention also provides a method for forming a glass sintered electrode using the above-mentioned forming mold, comprising the following steps: S1: Insert the upper part of the bottom mold into the first groove of the middle mold, then insert the lower part of the electrode needle into the needle hole, inject glass powder into the first through hole, then insert the crimping part of the upper mold into the first through hole, and ensure that the upper part of the electrode needle is inserted into the second through hole, and apply the following pressure to the pressure-bearing part of the upper mold so that the glass powder is pressed on the electrode needle to form a glass column; S2: The upper mold, the middle mold and the formed glass sintered electrode are pressed together and pulled away from the bottom mold, and the whole is turned upside down. The following pressure is applied to the middle mold to push the glass column out of the second through hole to complete the demolding.

[0013] As a general inventive concept, the present invention also provides a forming device for glass sintered electrodes, comprising a press and the aforementioned forming mold, wherein the bottom mold of the forming mold is detachably connected to the base of the press. Compared with the prior art, the present invention has the following advantages: This invention utilizes an innovative mold for pre-pressing glass powder and electrode pins. This allows for a single-step pressing process to form a glass column on the electrode pin, with the height between the electrode pin and the glass powder controlled. This pre-formed product is then placed on an electrode base plate and co-fired at high temperature to produce a sintered glass electrode. Compared to existing glass sintered electrode production methods, this eliminates the need for glass powder debinding and assembly of glass particles with metal electrode pins, shortening the process, reducing costs, and improving yield. Furthermore, this solution eliminates the need for organic binders, preventing the introduction of impurities and thus ensuring the precision of the hemispherical resonant gyroscope. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to make the present invention more easily understood, the present invention will be described in more detail with reference to the specific embodiments shown in the accompanying drawings. These drawings only depict typical embodiments of the present invention and should not be considered as limiting the scope of protection of the present invention.

[0015] Figure 1 This is a schematic diagram of the explosion structure of the glass sintered electrode formed by the forming mold of the glass sintered electrode in Example 1 of the present invention.

[0016] Figure 2 This is a schematic diagram of the explosion structure of the glass sintered electrode demoulding from the forming mold of the glass sintered electrode in Example 1 of the present invention.

[0017] Figure 3 This is a schematic diagram of the cross-sectional structure of the fixed base, bottom mold and middle mold after assembly in Example 1 of the present invention.

[0018] Figure 4 Insertion of electrode needles Figure 3 Schematic diagram of the cross-section structure in the assembly.

[0019] Figure 5 Schematic diagram of the cross-sectional structure of adding glass powder to the assembly.

[0020] Figure 6 This is a schematic diagram of the cross-sectional structure of a glass sintered electrode formed by a forming mold of the glass sintered electrode according to Example 1 of the present invention.

[0021] Figure 7 This is a schematic diagram of the cross-sectional structure of the glass sintered electrode demoulded from the forming mold of the glass sintered electrode according to Example 1 of the present invention.

[0022] Figure 8 Schematic diagram of the cross-sectional structure of the glass sintered electrode release molding mold.

[0023] Figure 9 Schematic diagram of the structure of the forming device of the glass sintered electrode of Example 2.

[0024] Reference numerals: 1. Molding mold; 2. Press; 21. Base; 3. Demolding seat; 31. Fourth groove; 32. Positioning pin through hole; 4. Upper pressing mold; 41. Pressure-bearing part; 42. Crimping part; 43. Second through hole; 5. Middle mold; 51. First through hole; 52. First groove; 53. Positioning pin blind hole; 6. Glass sintered electrode; 61. Electrode needle; 62. Glass column; 7. Bottom mold; 71. Pinhole; 72. Top screw hole; 8. Fixing seat; 81. Second groove; 82. Third groove. DETAILED DESCRIPTION

[0025] The following describes the embodiments of the present invention with reference to the accompanying drawings so that those skilled in the art can better understand the present invention and implement it. However, the enumerated embodiments are not intended to limit the present invention. Unless there is a conflict, the following embodiments and the technical features in the embodiments can be combined with each other, wherein the same components are represented by the same figure marks.

[0026] Example 1: like Figures 1-8 As shown, this embodiment provides a forming mold for a glass sintered electrode, including: an upper die 4, a middle die 5 and a bottom die 7, the upper die 4 includes a pressure-bearing portion 41 and a crimping portion 42 integrally formed at the lower end of the pressure-bearing portion 41, the middle die 5 is provided with a first through hole 51 that cooperates with the crimping portion 42 of the upper die 4, the bottom surface of the middle die 5 is provided with a first groove 52 that cooperates with the upper portion of the bottom die 7, the upper die 4 is provided with a second through hole 43 that cooperates with the electrode needle 61 of the glass sintered electrode 6, the top surface of the bottom die 7 is provided with a pinhole 71 that cooperates with the electrode needle 61 of the glass sintered electrode 6, and the second through hole 43 and the pinhole 71 are coaxially arranged.

[0027] When forming the glass sintered electrode, the upper portion of the bottom mold 7 is inserted into the first groove 52, and the lower portion of the electrode needle 61 is inserted into the needle hole. Glass powder is injected into the first through hole. The crimping portion 42 of the upper mold 4 is then inserted into the first through hole 51, ensuring that the upper portion of the electrode needle 61 is inserted into the second through hole 43. The following pressure is applied to the pressure-bearing portion 41 of the upper mold 4, so that the glass powder is pressed onto the electrode needle 61 to form a glass column 62; When demolding the glass sintered electrode, the upper mold 4, the middle mold 5 and the formed glass sintered electrode 6 are pressed together to form a whole, which is pulled away from the bottom mold 7 and inverted. The following pressure is applied to the middle mold 5 to push the glass column 62 out of the second through hole 43 to complete the demolding.

[0028] Therefore, the present invention utilizes an innovative mold designed to pre-press the glass powder and electrode needles into a single piece. This allows for the formation of glass columns on the electrode needles in a single step, with the height between the electrode needles and the glass powder being controllable. This pre-formed product is then placed on an electrode base plate and subjected to high-temperature co-firing to produce a sintered glass electrode. Compared to existing glass sintered electrode preparation methods, this eliminates the steps involved in glass powder debinding and assembly of glass particles with metal electrode needles, shortening the process, reducing costs, and improving yield. Furthermore, this solution eliminates the need for organic binders, preventing the introduction of impurities, thereby ensuring the precision of the hemispherical resonant gyroscope.

[0029] In this embodiment, the forming mold further comprises a fixing seat 8 , the top surface of which is provided with a second groove 81 cooperating with the lower portion of the bottom mold 7 , and the bottom surface of the second groove 81 is provided with a third groove 82 cooperating with the pressure-bearing portion 41 of the upper die 4 .

[0030] When the glass sintered electrode is formed, the lower part of the bottom mold 7 is positioned in the second groove 81. When the glass sintered electrode is demoulded, the pressure-bearing part 41 of the inverted upper mold 4 is positioned in the third groove 82 to prevent the mold from shaking during the force application process.

[0031] In this embodiment, a top screw hole 72 is formed on the bottom surface of the bottom mold 7 , and the top screw hole 72 extends upward to be communicated with the needle hole 71 .

[0032] A top screw can be inserted into the top screw hole 72 to adjust the length of the electrode needle 61 in the needle hole 71, and ultimately adjust the position of the glass column 62 on the electrode needle 61.

[0033] In this embodiment, the forming mold further includes a demoulding seat 3 , and a fourth groove 31 is formed on the bottom surface of the demoulding seat 3 to cooperate with the pressure-bearing portion 42 of the upper die 4 .

[0034] In this embodiment, the demoulding seat 3 is provided with a plurality of positioning pin through holes 32 , and the bottom surface of the middle mold 5 is provided with a plurality of positioning pin blind holes 53 . The plurality of positioning pin through holes 32 and the plurality of positioning pin blind holes 53 correspond to each other one by one.

[0035] When the glass sintered electrode is formed, the demolding seat 3 is positioned with the pressing equipment through the positioning pin through-hole 32 and the positioning pin located therein, so that the press can apply downward pressure to the pressure-bearing part 41 of the upper mold 4; when the glass sintered electrode is demolded, the positioning pin can be directly inserted into the positioning pin blind hole 52 on the upper mold 4, or the demolding seat 3 can be placed on the inverted middle mold 5. At this time, the positioning pin passes through the positioning pin through-hole 32 on the demolding seat 3 and is inserted into the positioning pin blind hole 53 on the upper mold 4, so that the press can apply downward pressure to the middle mold 5.

[0036] The steps for forming and demoulding the glass sintered electrode in this embodiment are as follows: 1) Prepare dry powder: Mix glass powder in a mass ratio of glass powder to water = 10:1; 2) Weigh dry powder: Weigh the prepared dry powder on a scale: 0.5g / powder; 3) Install the mold: Adjust the top screw in the top screw hole 72 under the bottom mold 7 according to the size of the electrode needle, place the bottom mold 7 on the fixing seat 8, insert the electrode needle 61 into the pinhole 71 of the bottom mold 7, and then put the middle mold 5 on the bottom mold 7. Figure 3 and Figure 4 As shown; 4) Dry pressing: Figure 5 As shown, the glass powder 9 is poured into the first through hole 51 of the middle mold 5, the crimping portion 42 of the upper mold 4 is inserted into the first through hole 51, and then the demolding seat 3 is closed, and the press 2 is started. The dry pressing molding is completed at a pressure of 100 kg for 5 seconds. Figure 6 As shown; 5) Demolding: Take out the bottom mold 7, and place the upper mold 4 + middle mold 5 + molded product 6 upside down on the fixed seat 8, as shown in the following figure: Figure 7 As shown, the demoulding seat 3 is placed on the middle mold 5, positioned by three positioning pins, and the middle mold 5 is pressed down by the press 2, so that the product 6 is ejected and the demoulding is completed, as shown in FIG. Figure 8 shown.

[0037] The glass powder comprises, by mass percentage, 25-35wt% quartz powder, 0-5wt% alumina powder, 25-35wt% boric acid, 8-22wt% sodium carbonate, 3-8wt% potassium carbonate, 5-10wt% calcium carbonate, 0-10% lithium carbonate, and 1-7% zinc oxide. This glass powder, when mixed with a small amount of water, achieves excellent dry-pressing results. After drying, the formed glass column securely bonds to the electrode needle and resists falling off or disintegrating. Example 2: like Figure 9 As shown, this embodiment provides a forming device for a glass sintered electrode, including a press 2 and the forming mold 1 and bottom mold 7 of the glass sintered electrode of embodiment 1 detachably connected to the base 21 of the press 2 .

[0038] The embodiments described above are merely preferred embodiments of the present invention. The phrases "in one embodiment," "in another embodiment," "in yet another embodiment," or "in other embodiments" used in this specification may refer to one or more of the same or different embodiments of the present disclosure. Any common changes and substitutions made by those skilled in the art within the scope of the present invention are intended to be encompassed within the scope of protection of the present invention.

Claims

1. A forming mold for a glass sintered electrode, characterized in that: The present invention comprises an upper die (4), a middle die (5) and a bottom die (7), wherein the upper die (4) comprises a pressure-bearing portion (41) and a crimping portion (42) integrally formed at the lower end of the pressure-bearing portion (41), the middle die (5) is provided with a first through hole (51) cooperating with the crimping portion (42) of the upper die (4), the bottom surface of the middle die (5) is provided with a first groove (52) cooperating with the upper portion of the bottom die (7), the upper die (4) is provided with a second through hole (43) cooperating with the electrode needle (61) of the glass sintered electrode (6), the top surface of the bottom die (7) is provided with a pinhole (71) cooperating with the electrode needle (61) of the glass sintered electrode (6), and the second through hole (43) and the pinhole (71) are coaxially arranged.

2. The forming mold for the glass sintered electrode according to claim 1, characterized in that: It also includes a fixing seat (8), the top surface of the fixing seat (8) is provided with a second groove (81) that cooperates with the lower part of the bottom mold (7), and the bottom surface of the second groove (81) is provided with a third groove (82) that cooperates with the pressure-bearing part (41) of the upper pressing mold (4).

3. The forming mold for the glass sintered electrode according to claim 2, characterized in that: A top screw hole (72) is provided on the bottom surface of the bottom mold (7), and the top screw hole (72) extends upward to communicate with the needle hole (71).

4. The forming mold for a glass sintered electrode according to any one of claims 1 to 3, characterized in that: It also includes a demoulding seat (3), the bottom surface of which is provided with a fourth groove (31) that cooperates with the pressure-bearing portion (42) of the upper die (4).

5. The forming mold for the glass sintered electrode according to claim 4, characterized in that: The demoulding seat (3) is provided with a plurality of positioning pin through holes (32), and the bottom surface of the middle mold (5) is provided with a plurality of positioning pin blind holes (53), and the plurality of positioning pin through holes (32) and the plurality of positioning pin blind holes (53) correspond to each other one by one.

6. A method for forming a glass sintered electrode using the forming mold according to any one of claims 1 to 5, comprising the following steps: S1: Insert the upper portion of the bottom mold (7) into the first groove (52) of the middle mold (5), then insert the lower portion of the electrode needle (61) into the needle hole (71), inject glass powder into the first through hole (51), then insert the pressing portion (42) of the upper mold (4) into the first through hole (51), and ensure that the upper portion of the electrode needle (61) is inserted into the second through hole (43), and apply the following pressure to the pressure-bearing portion (41) of the upper mold (4) so ​​that the glass powder is pressed on the electrode needle (61) to form a glass column (62); S2: The entirety formed by pressing the upper die (4), the middle die (5) and the formed glass sintered electrode (6) is pulled away from the bottom die (7), and turned upside down. The following pressure is applied to the middle die (5) to push the glass column (62) out of the second through hole (43) to complete demoulding.

7. A forming device for a glass sintered electrode, comprising a press (2), characterized in that: It also comprises a forming die (1) as claimed in any one of claims 1 to 5, wherein the bottom die (7) of the forming die (1) is detachably connected to the base (21) of the press (2).

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