Process and apparatus for static pressing of microcrystalline plate-like corundum products

Abstract

The present application relates to the technical field of static pressure forming, and discloses a static pressure forming process and equipment for microcrystalline plate-shaped corundum products, wherein the static pressure assembly is used for hydraulic driving, and after being pressurized to a set pressure, the internal pressure loss of the oil circuit is continuously compensated. The feeding box is driven by a first servo motor of the limiting assembly to realize uniform distribution of materials in the whole cavity through transverse reciprocating movement along the first lead screw, and the feeding amount can be controlled in different zones to realize profiled feeding, so that the complex special-shaped mold with high and low differences can be accurately matched. According to the actual measurement and verification, for the special-shaped products with a high and low difference of greater than or equal to 5 mm, the density difference of each region of the blank body is controlled to be less than or equal to 0.05 g / cm3 from the traditional manual material distribution of greater than or equal to 0.15 g / cm3, the sintering internal stress is greatly reduced, the qualified rate of finished products is increased from 70% to 75% to 95% to 97%, the finished product rate is increased by 20 to 25 percentage points, the blank body is prevented from generating stratification and internal porosity defects, and the forming quality stability is further improved.

Description

Technical Field

[0001] This invention relates to the field of hydrostatic pressing technology, specifically to a hydrostatic pressing process and equipment for microcrystalline plate-shaped corundum products. Background Technology

[0002] The Al2O3 content in microcrystalline tabular corundum can reach over 99%, with no added additives such as magnesium oxide or boron oxide. After calcination, it shrinks sufficiently, resulting in large and well-developed Al2O3 plate-like crystals. It has a high proportion of closed pores and an overall porosity similar to fused alumina. It also possesses excellent characteristics such as stable volume and extremely low reheat shrinkage. The material has high hardness, excellent wear resistance, and superior mechanical strength, making it suitable for processing reactors, wear-resistant molds, abrasive tools, and wear-resistant components for the human body. Furthermore, it has the advantages of stable high-temperature insulation and airtight heat resistance, making it widely used in high-temperature insulating components, vacuum electronic packaging shells, high-temperature vacuum tubes, and other fields, with a broad market application scope.

[0003] Currently, the forming of tabular corundum blanks mostly adopts traditional static pressing production lines. This relies on manual loading of corundum powder into the mold in precise quantities, followed by pressing using hydraulic static pressing equipment. After forming, the blank is manually removed, transported, and sintered. The entire process is highly dependent on manual operation. Manual feeding is prone to problems such as uneven material distribution and large deviations in filling amount. Manual blank removal is labor-intensive and severely restricts the continuous operation efficiency of the production line. Furthermore, traditional static pressing molds lack a matching uniform material distribution structure. For complex irregularly shaped blanks with varying heights, the natural flow of powder filling is significantly different, resulting in density differences in different areas of the pressed blank. Cracking and scrapping can also occur during the sintering process. Therefore, a static pressing forming equipment and supporting process for microcrystalline tabular corundum products have been designed to solve the problems of manual loading and unloading and uneven material distribution, improve the uniformity of blank forming and production continuity, reduce reliance on manual labor, and improve product qualification rate and batch production efficiency. Summary of the Invention

[0004] In view of the above-mentioned shortcomings of the prior art, the present invention provides a static pressure forming process and equipment for microcrystalline plate-shaped corundum products, which can effectively solve the problems in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a static pressing process for forming microcrystalline plate-shaped corundum products, comprising the following steps: S1. Feed the corundum powder into the feeding box through the feeding port. The feeding box feeds the powder horizontally and back and forth, controlling the amount in sections to adapt to the irregular mold. After completion, the feeding box returns to standby. S2. The hydraulic drive box drives the hydraulic telescopic rod downward, the static pressure connecting plate presses the lifting constraint plate to compress the lifting spring and moves downward synchronously, the longitudinal plug plate inserts into the fixed plug slot to lock the lower mold, and the upper mold closes and contacts the powder. S3. The hydraulic telescopic rod continuously applies pressure, the pressure-resistant spring buffers and stabilizes the pressure, and the hydraulic drive box compensates the oil circuit to achieve long-term pressure maintenance. The air in the cavity is discharged through the exhaust hole and exhaust groove, and the static pressure is maintained until the set time to complete the blank forming. S4. The hydraulic telescopic rod rises to open the mold, the lifting spring drives the limit component to reset, the longitudinal plug plate disengages and unlocks, and the anti-compression spring lifts the lifting reset table back to the discharge height. S5, the No. 2 servo motor drives the No. 2 lead screw to push the L-shaped pusher plate forward, the lower mold presses the constraint baffle and slides into the mold moving groove to discharge the material, and then the pusher plate and the baffle are reset in sequence. S6. Transfer the blank to the sintering process, replace with a new empty mold and repeat the process to achieve continuous automated batch forming.

[0006] The present invention also provides a hydrostatic pressing apparatus for forming microcrystalline plate-shaped corundum products, comprising: A hydrostatic assembly is used to hydraulically drive a hydrostatic mold. When the hydrostatic assembly pressurizes the hydrostatic mold to a set pressure, the hydrostatic assembly continuously compensates for the internal pressure loss of the oil circuit and maintains the pressure applied by the hydrostatic assembly within the set range. A pressure-resistant component is fixedly installed inside the static pressure component. The pressure-resistant component passively contracts to counteract the excess pressure output by the static pressure component, thereby maintaining a constant pressure output to the pressure-resistant component. The first reset component is movably sleeved on the anti-compression component, and the first reset component provides limiting constraints on both sides of the standard specification pressing mold. The second reset assembly is fixedly installed on the static pressure assembly. A lifting constraint plate is movably sleeved on the second reset assembly. The lifting constraint plate can enable the static pressure assembly to move up and down synchronously within a certain limit when hydraulically driven. A limiting component is fixedly installed on the lower surface of the lifting constraint plate. The limiting component is used to control the placement position and amount of corundum powder. A static pressure mold, which is divided into two parts, is fixedly installed on the inner side of the static pressure assembly and the upper surface of the anti-compression assembly, respectively. The static pressure mold is used to contain corundum powder and press it. The material ejector assembly is fixedly installed inside the static pressure assembly. After the static pressure mold is pressed, the material ejector assembly is used to push out the movable pressing mold and the corundum product inside.

[0007] It also includes a static pressure assembly comprising a pressing fixed platform, a support fixed rod, a hydraulic drive box, a limiting support plate, and a hydraulic telescopic rod. Multiple support fixed rods are fixedly provided on the upper surface of the pressing fixed platform. A hydraulic drive box is fixedly provided at the end of the support fixed rod away from the pressing fixed platform. A hydraulic telescopic rod is fixedly provided on the lower surface of the hydraulic drive box. A limiting support plate is fixedly provided on the support fixed rod. The limiting support plate is fixedly sleeved on the outer wall of the hydraulic telescopic rod.

[0008] It also includes, wherein the pressure-resistant component comprises a pressing fixing seat, a constraint limiting groove, a guide connecting column, a pressure-resistant spring, a mold moving groove, a drive mounting groove, and a telescopic constraint groove. The pressing fixing seat is fixedly installed on the upper surface of the pressing fixing platform. The pressing fixing seat has the constraint limiting groove, the mold moving groove, the drive mounting groove, and the telescopic constraint groove. The guide connecting column is fixedly provided on the constraint limiting groove. The pressure-resistant spring is movably sleeved on the guide connecting column.

[0009] It also includes the first reset assembly comprising a lifting reset platform, a plug-in constraint slot, a rotating constraint column, a rotating sleeve, a movable constraint plate, a constraint baffle, a fixed connecting plate, and a fixed plug-in slot. The lifting reset platform is movably plugged into the guide connecting column. The end of the anti-compression spring away from the pressing fixed platform abuts against the lifting reset platform. Two fixed connecting plates are fixedly provided on the upper surface of the lifting reset platform. A fixed plug-in slot is provided on the fixed connecting plate. A plug-in constraint slot is provided on the lifting reset platform. A rotating constraint column is fixedly provided inside the plug-in constraint slot.

[0010] It also includes a rotating sleeve movably sleeved on the rotating constraint column, a movable constraint plate and a constraint baffle fixedly mounted on the rotating sleeve, and multiple return springs provided inside the insertion constraint groove. One end of each return spring is fixedly connected to the movable constraint plate. Under no external force, the constraint baffle is horizontally set, and the constraint baffle, the lifting reset platform, and the mold moving groove are on the same plane.

[0011] It also includes the second reset assembly comprising a reset support base, a reset support column, a constraint fixing block, a lifting constraint plate, and a lifting spring. The reset support base is fixedly installed on the upper surface of the pressing fixing base. Multiple reset support columns are fixedly provided on the upper surface of the reset support base. A constraint fixing block is fixedly provided at the same height on each reset support column. The lifting constraint plate is movably sleeved between the constraint fixing block and the reset support base. The lifting spring is movably sleeved on the reset support column and is located between the lifting constraint plate and the reset support base.

[0012] It also includes a limiting assembly comprising a transverse connecting plate, a longitudinal insert plate, a limiting baffle, a lead screw, a feeding box, a feeding trough, a servo motor, and a feeding port. Limiting baffles are fixedly mounted on the lower surfaces of the two lifting constraint plates, and a transverse connecting plate is fixedly mounted between the two limiting baffles. A longitudinal insert plate is fixedly mounted on the lower surface of the transverse connecting plate. A lead screw is movably mounted on the limiting baffle. A servo motor is fixedly mounted on one side of the limiting baffle, and one end of the servo motor is fixedly connected to the lead screw. A feeding box is fixedly mounted on the upper surface of the transverse connecting plate. The feeding box is movably sleeved on the lead screw, and the lead screw and the feeding box are threaded together. A feeding trough is formed on the feeding box, and a feeding port is fixedly mounted on the outer surface of the feeding box, communicating with the feeding trough.

[0013] It also includes a static pressure mold comprising a static pressure connecting plate, an upper mold, an exhaust hole, an exhaust groove, a fixed connecting block, and a lower mold. The fixed connecting block is fixedly provided on the upper surface of the static pressure connecting plate, and the upper mold is fixedly provided on the lower surface of the static pressure connecting plate. An exhaust hole is provided on the side of the upper mold, and the exhaust hole is connected to the top inner side of the upper mold. An exhaust groove is provided on the static pressure connecting plate to prevent air from being unable to be exhausted through the vent outside the exhaust hole.

[0014] It also includes the following: the pushing assembly comprises an L-shaped pushing plate, a threaded sleeve, a protective baffle, a support connecting plate, a second servo motor, a second lead screw, and auxiliary guide rods. The L-shaped pushing plate is movably inserted into the inner side of the telescopic constraint groove. The threaded sleeve is movably mounted on the L-shaped pushing plate. The protective baffle is fixedly mounted on the upper surface of the drive mounting groove. A support connecting plate is fixedly mounted between the protective baffle and the pressing fixing seat. A second lead screw is movably mounted on the support connecting plate. One end of the second lead screw is movably inserted into the inner side of the threaded sleeve. The second lead screw and the threaded sleeve are engaged by threads. A second servo motor is fixedly mounted on one side of the support connecting plate. One end of the second servo motor is fixedly connected to the second lead screw. Two auxiliary guide rods are fixedly mounted on the protective baffle. The auxiliary guide rods are movably inserted into the L-shaped pushing plate.

[0015] The technical solution provided by this invention has the following advantages compared with the prior art: This invention uses a servo motor in the limiting component to drive the feeding box to reciprocate laterally along the lead screw, achieving uniform material distribution throughout the cavity. Simultaneously, it allows for zoned adjustment of the feeding amount to achieve contour feeding, precisely adapting to complex irregular molds with varying heights. Actual testing has verified that for irregularly shaped products with height differences ≥5mm, the density difference between different areas of the blank is controlled from ≥0.15g / cm³ under traditional manual feeding to within 0.05g / cm³, significantly reducing sintering internal stress. The finished product qualification rate increases from 70%-75% to 95%-97%, a 20-25 percentage point increase in yield. It also avoids delamination and internal porosity defects in the blank, further improving the stability of molding quality.

[0016] This invention relies on the No. 2 servo motor of the pusher assembly to drive the L-shaped pusher plate to automatically push out the formed lower mold and blank, completely replacing the manual blank removal operation. Combined with the automatic feeding structure, it eliminates many time-consuming processes such as manual weighing, material leveling, and manual demolding. According to production tests, the production cycle of a single station and a single mold is shortened from 14-16 minutes in the traditional process to 7-8 minutes, the overall production efficiency is increased by 90%-110%, the single-shift capacity is increased by more than double, the labor intensity and human operation error are greatly reduced, the production line is guaranteed to operate continuously and stably, and it is suitable for the large-scale mass production of microcrystalline plate corundum. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 This is a schematic diagram of the front cross-sectional structure in an embodiment of the present invention; Figure 3 This is a schematic diagram of the second reset component in an embodiment of the present invention; Figure 4 This is a partial structural schematic diagram of an embodiment of the present invention; Figure 5 This is a schematic diagram of the hydrostatic mold structure in an embodiment of the present invention; Figure 6 This is a schematic diagram of the limiting component structure in an embodiment of the present invention; Figure 7 This is a schematic diagram of the anti-compression component structure in an embodiment of the present invention; Figure 8 This is a schematic diagram of the structure of the first reset component in an embodiment of the present invention; Figure 9 This is a schematic diagram of the rotating sleeve structure in an embodiment of the present invention.

[0019] The labels in the diagram represent: 1. Static pressure assembly; 11. Pressing fixed platform; 12. Support fixed rod; 13. Hydraulic drive box; 14. Limiting support plate; 15. Hydraulic telescopic rod; 2. Anti-compression assembly; 21. Pressing fixed seat; 22. Constraint limiting groove; 23. Guide connecting column; 24. Anti-compression spring; 25. Mold moving groove; 26. Drive mounting groove; 27. Telescopic constraint groove; 3. First reset assembly; 31. Lifting reset platform; 32. Insertion constraint groove; 33. Rotating constraint column; 34. Rotating sleeve; 35. Movable constraint plate; 36. Constraint baffle; 37. Fixed connecting plate; 38. Fixed insertion groove; 4. Second reset assembly; 41. Reset support seat; 4 2. Reset support column; 43. Constraint fixing block; 44. Lifting constraint plate; 45. Lifting spring; 5. Limiting assembly; 51. Horizontal connecting plate; 52. Longitudinal plug-in plate; 53. Limiting baffle; 54. No. 1 lead screw; 55. Feeding box; 56. Feeding trough; 57. No. 1 servo motor; 58. Feeding connection port; 6. Static pressure mold; 61. Static pressure connecting plate; 62. Upper mold; 63. Vent hole; 64. Vent groove; 65. Fixing connecting block; 66. Lower mold; 7. Pushing assembly; 71. L-shaped push plate; 72. Threaded sleeve; 73. Protective baffle; 74. Support connecting plate; 75. No. 2 servo motor; 76. No. 2 lead screw; 77. Auxiliary guide rod. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0021] The present invention will be further described below with reference to embodiments. Example

[0022] Please see Figures 1-5This invention provides a technical solution: a hydrostatic pressing equipment for microcrystalline plate-shaped corundum products, including a hydrostatic component 1, which is hydraulically driven and continuously compensates for internal pressure loss in the oil circuit after being pressurized to a set pressure, maintaining the pressure applied by the hydrostatic component 1 within a set range for a long time; a pressure-resistant component 2, which is fixedly installed inside the hydrostatic component 1, and the pressure-resistant component 2 offsets the excess pressure output by passively contracting, maintaining the pressure output to the pressure-resistant component 2 at a constant level; a first reset component 3, which is movably sleeved on the pressure-resistant component 2, and provides lateral limiting constraints for the standard specification pressing mold; and a second reset component 4, which is fixedly installed on the hydrostatic component 1, and a lifting constraint plate 44 is movably sleeved on the second reset component 4, which allows the hydrostatic component 1 to move up and down synchronously within a certain limit when hydraulically driven. Limiting component 5 is fixedly installed on the lower surface of lifting constraint plate 44. Limiting component 5 is used to control the feeding position and amount of corundum powder. Static pressure mold 6 is divided into two parts, which are fixedly installed on the inner side of static pressure component 1 and the upper surface of anti-compression component 2, respectively. Static pressure mold 6 is used to contain corundum powder and press it. Pushing component 7 is fixedly installed on the inner side of static pressure component 1. After the static pressure mold 6 has finished pressing, pushing component 7 is used to push out the movable pressing mold and the corundum product inside. The static pressure assembly 1 includes a pressing fixed platform 11, a support fixed rod 12, a hydraulic drive box 13, a limiting support plate 14, and a hydraulic telescopic rod 15. Multiple support fixed rods 12 are fixedly provided on the upper surface of the pressing fixed platform 11. A hydraulic drive box 13 is fixedly provided at the end of the support fixed rod 12 away from the pressing fixed platform 11. A hydraulic telescopic rod 15 is fixedly provided on the lower surface of the hydraulic drive box 13. A limiting support plate 14 is fixedly provided on the support fixed rod 12. The limiting support plate 14 is fixedly sleeved on the outer wall of the hydraulic telescopic rod 15. The compression-resistant component 2 includes a compression fixing seat 21, a constraint limiting groove 22, a guide connecting post 23, a compression-resistant spring 24, a mold moving groove 25, a drive mounting groove 26, and a telescopic constraint groove 27. The compression fixing seat 21 is fixedly installed on the upper surface of the compression fixing table 11. The compression fixing seat 21 has the constraint limiting groove 22, the mold moving groove 25, the drive mounting groove 26, and the telescopic constraint groove 27. The guide connecting post 23 is fixedly provided on the constraint limiting groove 22, and the compression-resistant spring 24 is movably sleeved on the guide connecting post 23.

[0023] In specific implementation: The static pressure assembly 1 uses the pressing fixed table 11 as the bearing base of the whole machine. Multiple supporting fixed rods 12 are used to stably support the hydraulic drive box 13 upwards. The hydraulic drive box 13 outputs power to drive the hydraulic telescopic rod 15 to rise and fall vertically, providing the pressing pressure required for the static pressure mold 6 to form. The limiting support plate 14, which is fixedly sleeved on the outer wall of the supporting fixed rod 12, is sleeved on the outside of the hydraulic telescopic rod 15. It can limit the radial displacement of the hydraulic telescopic rod 15 when it is pressed down and lifted, ensuring the vertical stability of the pressing action and avoiding uneven density of the billet caused by bias pressure. The pressure compensation oil circuit is integrated inside the hydraulic drive box 13 and consists of a pressure sensor, an overflow oil replenishment valve, an accumulator, and a matching control oil circuit. It is connected to the drive oil circuit of the hydraulic telescopic rod 15. When the corundum powder is compressed, particle rearrangement and slight compression deformation occur, which will cause the oil pressure in the hydraulic cylinder to drop slowly. If it is not compensated in time, the insufficient pressure in the mold will cause the compaction density and uniformity of the green body to be low, which will directly affect the sintering quality of the finished product. When the pressure is lower than the lower limit of the set value, the oil replenishment is automatically opened to restore the pressure to the set value. When the pressure reaches the upper limit, it is automatically closed to stabilize the pressing pressure within the set range. The main oil pump does not need to run at full load continuously, which reduces the energy consumption of the hydraulic system while ensuring the pressure stabilization accuracy. The anti-compression component 2 is fixed to the pressing fixing seat 21 on the upper surface of the pressing fixing table 11. The constraint limiting groove 22 opened in the pressing fixing seat 21 is used to assemble the guide connecting column 23. The anti-compression spring 24 sleeved on the guide connecting column 23 can passively contract when the pressure of the hydraulic telescopic rod 15 exceeds the set value to offset the excess pressure. Based on the thickness, specifications, and density requirements of microcrystalline tabular corundum products, the pressing pressure is set within the range of 120MPa-280MPa. During the holding pressure stage, the pressure fluctuation is controlled within ±2% of the set pressure. For tabular corundum products of conventional thickness, a set pressure of 200MPa is recommended. During the holding pressure stage, the pressure is stably maintained in the range of 196MPa-204MPa. With the buffering and stabilizing effect of the pressure-resistant component 2, the uniform pressure and consistent density of each area of ​​the blank can be further ensured.

[0024] Please see Figures 4-9 The present invention provides a technical solution: the first reset component 3 includes a lifting reset platform 31, an insertion constraint groove 32, a rotating constraint column 33, a rotating sleeve 34, a movable constraint plate 35, a constraint baffle 36, a fixed connecting plate 37, and a fixed insertion groove 38. The lifting reset platform 31 is movably inserted into the guide connecting column 23. The end of the anti-compression spring 24 away from the pressing fixed platform 11 abuts against the lifting reset platform 31. Two fixed connecting plates 37 are fixedly provided on the upper surface of the lifting reset platform 31. The fixed connecting plate 37 has a fixed insertion groove 38. The lifting reset platform 31 has an insertion constraint groove 32. The rotating constraint column 33 is fixedly provided inside the insertion constraint groove 32. A rotating sleeve 34 is movably sleeved on the rotating constraint column 33. A movable constraint plate 35 and a constraint baffle 36 are fixedly mounted on the rotating sleeve 34. Multiple return springs are provided inside the insertion constraint groove 32. One end of each return spring is fixedly connected to the movable constraint plate 35. The constraint baffle 36 is horizontally set when no external force is applied, and the constraint baffle 36, the lifting reset table 31, and the mold moving groove 25 are on the same plane. The second reset assembly 4 includes a reset support base 41, a reset support column 42, a constraint fixing block 43, a lifting constraint plate 44, and a lifting spring 45. The reset support base 41 is fixedly installed on the upper surface of the pressing fixing base 21. Multiple reset support columns 42 are fixedly provided on the upper surface of the reset support base 41. A constraint fixing block 43 is fixedly provided at the same height on each reset support column 42. The lifting constraint plate 44 is movably sleeved between the constraint fixing block 43 and the reset support base 41. The lifting spring 45 is movably sleeved on the reset support column 42 and is located between the lifting constraint plate 44 and the reset support base 41.

[0025] In specific implementation: A rotating constraint column 33 is installed inside the insertion constraint groove 32 of the lifting reset platform 31. A rotating sleeve 34 is sleeved on the outside of the rotating constraint column 33. The sleeve integrally connects the movable constraint plate 35 and the constraint baffle 36. The reset spring in the groove pulls the movable constraint plate 35. When there is no external force, the constraint baffle 36 remains horizontal and limits the two sides of the lower mold 66 placed on the lifting reset platform 31. When pushing the material, the mold can squeeze the constraint baffle 36 to rotate around the axis to make room. The material push is completed and the mold automatically rebounds. The second reset component 4 is fixed to the pressing and fixing base 21 with the reset support base 41 as the mounting base. Multiple reset support columns 42 synchronously support the lifting constraint plate 44. The constraint fixing block 43 limits the highest position of the lifting constraint plate 44. The lifting spring 45 sleeved on the reset support column 42 supports the lifting constraint plate 44. When the static pressure component 1 presses down, the lifting constraint plate 44 moves down synchronously with the upper mold 62, driving the limiting component 5 to complete the mold positioning. After the mold is opened, the lifting spring 45 lifts the lifting constraint plate 44 and synchronously raises the limiting component 5, disengaging it from the mold surface.

[0026] Please see Figures 1-9The present invention provides a technical solution: the limiting component 5 includes a transverse connecting plate 51, a longitudinal insert plate 52, a limiting baffle 53, a first lead screw 54, a feeding box 55, a feeding trough 56, a first servo motor 57, and a feeding connection port 58. Limiting baffles 53 are respectively fixedly mounted on the lower surfaces of two lifting constraint plates 44. A transverse connecting plate 51 is fixedly mounted between the two limiting baffles 53. A longitudinal insert plate 52 is fixedly mounted on the lower surface of the transverse connecting plate 51. A movable portion of the limiting baffle 53 is provided on the limiting baffle 53. A first lead screw 54 is fixedly mounted on one side of a limit baffle 53, and a first servo motor 57 is fixedly connected to one end of the first lead screw 54. A feeding box 55 is fixedly mounted on the upper surface of a transverse connecting plate 51. The feeding box 55 is movably sleeved on the first lead screw 54. The first lead screw 54 and the feeding box 55 are engaged by threads. A feeding groove 56 is opened on the feeding box 55. A feeding connection port 58 is fixedly mounted on the outer surface of the feeding box 55. The feeding connection port 58 is connected to the feeding groove 56. The static pressure mold 6 includes a static pressure connecting plate 61, an upper mold 62, an exhaust hole 63, an exhaust groove 64, a fixed connecting block 65, and a lower mold 66. The fixed connecting block 65 is fixedly provided on the upper surface of the static pressure connecting plate 61, and the upper mold 62 is fixedly provided on the lower surface of the static pressure connecting plate 61. The side of the upper mold 62 is provided with an exhaust hole 63, and the exhaust hole 63 is connected to the top of the inner side of the upper mold 62. An exhaust groove 64 is provided on the static pressure connecting plate 61 to prevent the air holes outside the exhaust hole 63 from being unable to exhaust. The pushing assembly 7 includes an L-shaped pushing plate 71, a threaded sleeve 72, a protective baffle 73, a support connecting plate 74, a second servo motor 75, a second lead screw 76, and auxiliary guide rods 77. The L-shaped pushing plate 71 is movably inserted into the inner side of the telescopic constraint groove 27. The threaded sleeve 72 is movably mounted on the L-shaped pushing plate 71. The protective baffle 73 is fixedly mounted on the upper surface of the drive mounting groove 26. The support connecting plate 74 is fixedly mounted between the protective baffle 73 and the pressing fixing seat 21. The second lead screw 76 is movably mounted on the support connecting plate 74. One end of the second lead screw 76 is movably inserted into the inner side of the threaded sleeve 72. The second lead screw 76 and the threaded sleeve 72 are engaged by threads. The second servo motor 75 is fixedly mounted on one side of the support connecting plate 74. One end of the second servo motor 75 is fixedly connected to the second lead screw 76. Two auxiliary guide rods 77 are fixedly mounted on the protective baffle 73. The auxiliary guide rods 77 are movably inserted into the L-shaped pushing plate 71.

[0027] In specific implementation: the anti-compression component 2 is fixedly mounted on the pressing fixed seat 21 on the upper surface of the pressing fixed table 11. The pressing fixed seat 21 has a constraint limiting groove 22, a mold moving groove 25, a drive mounting groove 26, and a telescopic constraint groove 27. The constraint limiting groove 22 is equipped with a guide connecting column 23. The guide connecting column 23 is movably sleeved with an anti-compression spring 24. When the hydraulic pressure exceeds the set value, the anti-compression spring 24 is passively contracted to offset the excess pressure and maintain the constant pressure of the corundum powder inside the mold. The mold moving groove 25 provides a sliding channel for the mold to discharge material. The drive mounting groove 26 and the telescopic constraint groove 27 reserve space for the assembly and movement of the pusher component 7. The lifting reset platform 31 of the first reset component 3 is movably mounted on the guide connecting column 23, with its bottom abutting against the top of the anti-compression spring 24. It sinks under pressure and automatically resets after being depressurized, relying on the anti-compression spring 24 to lift. Two sets of fixed connecting plates 37 are fixedly mounted on the lifting reset platform 31. The plates have fixed insertion slots 38, which can be inserted into the longitudinal insertion plate 52 of the limiting component 5 to lock the mold position. The lifting reset platform 31 has an insertion constraint slot 32, in which a rotating constraint column 33 is fixed. A rotating sleeve 34 is movably fitted onto the rotating constraint column 33, and the sleeve integrally connects to the movable constraint plate 35 and the constraint baffle 36. The insertion constraint groove 32 has multiple reset springs built in and is connected to the movable constraint plate 35. When there is no external force, the constraint baffle 36 remains horizontal and is on the same plane as the lifting reset table 31 and the mold moving groove 25. The longitudinal insertion plate 52 is directly above the fixed connecting plate 37. When the longitudinal insertion plate 52 descends, it will be inserted into the inside of the fixed insertion groove 38. The longitudinal insertion plate 52 continues to descend to the constraint baffle 36, so that one end of the longitudinal insertion plate 52 drives the constraint baffle 36 and the longitudinal insertion plate 52 to be inserted into the inside of the insertion constraint groove 32 together, thereby constraining and fixing the lower mold 66 inside. When the feeding process starts, the first servo motor 57 moves the feeding box 55 to the horizontal starting end of the cavity. Simultaneously, multiple independently controlled external negative pressure vacuum pumps are started. Each vacuum pump is connected to the corresponding feed inlet 58 on the side wall of the feeding box 55 through a conveying pipeline. Relying on the negative pressure suction, the alumina corundum powder is drawn from the raw material storage bin and transported to the feed inlet 58. The powder flows into the feeding trough 56 inside the feeding box 55. The bottom of the feeding trough 56 has a continuous material drop gap along the horizontal direction. The powder entering the trough falls continuously and evenly under its own weight, accurately falling into the cavity of the lower mold 66 below. The movement of the feeding box 55 covers each area of ​​the cavity in sequence, realizing full-area feeding within the cavity. For irregularly shaped molds with complex height differences, the negative pressure of the vacuum pump at the corresponding station can be adjusted independently. The flow rate and feeding time are controlled to adjust the powder feeding flow rate at the corresponding feed inlet 58. In areas with large cavity depth and high material requirements, the feeding flow rate is increased and the powder accumulation thickness is improved. In areas with small cavity depth and low material requirements, the feeding flow rate is reduced and the powder accumulation thickness is thinned. The powder height distribution matching the product contour is pre-formed in the cavity, which greatly reduces the lateral flow amplitude and flow distance of the powder during the pressing process. This avoids the problem of uneven density caused by excessive powder migration and effectively reduces the density difference in various areas of the blank. After the feeding box 55 has traveled the entire cavity area and the feeding amount has reached the set value, the negative pressure vacuum pump stops feeding. The first servo motor 57 drives the first lead screw 54 in reverse to drive the feeding box 55 back to the standby position on the side of the cavity, waiting for the subsequent mold closing and pressing process to start. The static pressure mold 6 is composed of a static pressure connecting plate 61, an upper mold 62, and a lower mold 66. The static pressure connecting plate 61 is connected to the hydraulic telescopic rod 15 through a fixed connecting block 65. The upper mold 62 has exhaust holes 63 arranged on its side wall and connected to the top of the cavity. It works with the exhaust groove 64 on the static pressure connecting plate 61 to discharge the compressed and sealed air, preventing the blank from delamination and porosity. The second servo motor 75 of the pusher assembly 7 drives the second lead screw 76 to rotate, which drives the L-shaped pusher plate 71 to be pushed horizontally along the telescopic constraint groove 27 via the threaded sleeve 72. The two auxiliary guide rods 77 limit the offset of the pusher plate. The forming mold is pushed to the mold moving groove 25 to complete the automatic material discharge, replacing manual material handling.

[0028] When in use, the equipment is in the initial standby state. The hydraulic telescopic rod 15 retracts to the upper limit position. The lifting spring 45 lifts the lifting constraint plate 44 to the limit height of the constraint fixing block 43. The limit component 5 lifts synchronously. The bottom surface of the longitudinal plug plate 52 is higher than the top surface of the lower mold 66. The anti-compression spring 24 lifts the lifting reset platform 31 to the upper limit position. The reset spring pulls the constraint baffle 36 to keep it horizontal. The unloaded lower mold 66 is placed on the lifting reset platform 31 by manual or robotic arm. The constraint baffles 36 on both sides complete the initial lateral limit. Then, the corundum powder is fed into the feeding slot 56 inside the feeding box 55 through the feeding connection port 58. The first servo motor 57 drives the first lead screw 54 to rotate, driving the feeding box 55 to move laterally back and forth to completely cover the mold cavity. The power of each negative pressure machine is adjusted individually to control the feeding amount in different areas. The high and low irregular molds are pre-formed to match the powder accumulation height. After feeding is completed, the feeding box 55 returns to the side standby position. The hydraulic drive box 13 starts and drives the hydraulic telescopic rod 15 to slowly descend. The static pressure connecting plate 61 first fits against the lifting constraint plate 44, and the compressed lifting spring 45 descends synchronously. The limit component 5 moves down accordingly. The longitudinal plug plate 52 is inserted into the fixed plug slot 38 of the fixed connecting plate 37 to accurately lock and position the lower mold 66. Then the upper mold 62 moves down to fit against the corundum powder inside the cavity. The hydraulic telescopic rod 15 continuously applies static pressure. When the pressure exceeds the process setting value, the anti-compression spring 24 is compressed and buffered to offset the excess hydraulic thrust and maintain constant pressure inside the mold. The hydraulic drive box 13 synchronously compensates for the oil circuit pressure loss to achieve long-term pressure stabilization. During the pressing process, the air inside the cavity is continuously discharged through the exhaust hole 63 and exhaust groove 64. After the pressure is held for the set time, the microcrystalline plate corundum blank is formed. The hydraulic drive box 13 controls the hydraulic telescopic rod 15 to rise upwards, the upper mold 62 disengages from the cavity, the lifting spring 45 gradually rebounds and lifts the lifting constraint plate 44, the longitudinal plug plate 52 is pulled out from the fixed plug slot 38 to release the mold positioning, the hydraulic telescopic rod 15 returns to the upper limit position, the anti-compression spring 24 synchronously lifts the lifting reset table 31, the upper mold 62 returns to the discharge height, the longitudinal plug plate 52 synchronously rises to release the constraint on the lower mold 66, the constraint baffle 36 returns to the horizontal state under the tension of the reset spring, the second servo motor 75 starts and drives the second lead screw 76 to rotate, pushes the L-shaped pusher plate 71 forward through the threaded sleeve 72, and pushes the lower mold 66 to slide. During the movement, the lower mold squeezes the constraint baffle 36 to rotate downwards to make room, the mold slides into the mold moving slot 25 to complete the discharge, after the discharge is completed, the motor reverses and the L-shaped pusher plate 71 returns to its original position; Workers or additional robotic arms are used to transfer the lower mold containing the shaped corundum blank to the sintering process. At the same time, a new empty lower mold is placed on the lifting and resetting platform 31. The entire process of material feeding, mold closing and static pressure, mold opening and material pushing is repeated to realize the continuous automated batch forming of microcrystalline plate corundum products.

[0029] A static pressing process for forming microcrystalline plate-shaped corundum products includes the following steps: S1. The corundum powder is fed into the feeding box 55 through the feeding port 58. The feeding box 55 feeds the material horizontally and back and forth, and the amount is controlled in sections to adapt to the irregular mold. After completion, the feeding box 55 returns to standby. S2, the hydraulic drive box 13 drives the hydraulic telescopic rod 15 to move downward, the static pressure connecting plate 61 presses the lifting constraint plate 44 to compress the lifting spring 45 and move downward synchronously, the longitudinal plug plate 52 inserts into the fixed plug slot 38 to lock the lower mold 66, and the upper mold 62 closes and contacts the powder. S3, the hydraulic telescopic rod 15 continuously applies pressure, the pressure-resistant spring 24 buffers and stabilizes the pressure, the hydraulic drive box 13 compensates the oil circuit to achieve long-term pressure maintenance, the air in the cavity is discharged through the exhaust hole 63 and the exhaust groove 64, and the static pressure is maintained until the set time to complete the blank forming. S4, the hydraulic telescopic rod 15 rises to open the mold, the lifting spring 45 drives the limit component 5 to reset, the longitudinal plug plate 52 disengages and unlocks, and the anti-compression spring 24 lifts the lifting reset table 31 back to the discharge height. S5, the second servo motor 75 drives the second lead screw 76 to push the L-shaped pusher plate 71 forward, the lower mold 66 presses the constraint baffle 36 into the mold moving groove 25 to discharge the material, and then the pusher plate and the baffle are reset in sequence. S6. Transfer the blank to the sintering process using the lower mold 66. After replacing with a new empty mold, repeat the process to achieve continuous automated batch forming.

[0030] Under the same conditions, production testing has verified that, compared with the traditional static pressing process of manual weighing and feeding, and manual blank removal, this process, relying on the structural improvement of the feeding box 55 for automatic reciprocating feeding and the L-shaped pusher plate 71 for automatic discharge, eliminates time-consuming processes such as manual weighing and feeding. The production cycle of a single station and a single mold is shortened from 14-16 minutes to 7-8 minutes, the overall production efficiency is increased by 90%-110%, and the single-shift capacity is more than doubled. For irregularly shaped microcrystalline plate-shaped corundum products with a height difference of ≥5mm, the traditional manual... The traditional method of material distribution results in a density difference of ≥0.15g / cm³ between different areas of the billet, which easily leads to cracking and delamination defects after sintering, resulting in a finished product qualification rate of only 70%-75%. This process achieves conformal material distribution by controlling the material feeding amount in different zones, and the density difference between different areas of the billet can be controlled within 0.05g / cm³, effectively reducing sintering internal stress. The finished product qualification rate can reach 95%-97%, increasing the yield by 20-25 percentage points. At the same time, it significantly reduces the intensity of manual labor and operational errors, ensuring the quality stability of mass production.

[0031] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A static pressing process for forming microcrystalline plate-shaped corundum products, characterized in that, The process is achieved using a hydrostatic pressing device for forming microcrystalline plate-shaped corundum products, and the steps are as follows: S1. Feed the corundum powder into the feeding box (55) through the feeding port (58). The feeding box (55) feeds the material horizontally back and forth, and controls the amount of material in each section to match the irregular mold. After completion, the feeding box (55) returns to standby. S2, the hydraulic drive box (13) drives the hydraulic telescopic rod (15) to move downward, the static pressure connecting plate (61) presses the lifting constraint plate (44) to compress the lifting spring (45) and moves downward synchronously, the longitudinal plug plate (52) inserts into the fixed plug slot (38) to lock the lower mold (66), and the upper mold (62) closes and contacts the powder. S3, the hydraulic telescopic rod (15) continuously pressurizes, the pressure-resistant spring (24) buffers and stabilizes the pressure, the hydraulic drive box (13) compensates the oil circuit to achieve long-term pressure maintenance, the air in the cavity is discharged through the exhaust hole (63) and exhaust groove (64), and the static pressure is maintained until the set time to complete the blank forming; S4, the hydraulic telescopic rod (15) rises to open the mold, the lifting spring (45) drives the limit component (5) to reset, the longitudinal plug plate (52) disengages and unlocks, and the anti-compression spring (24) lifts the lifting reset platform (31) back to the discharge height; S5, the second servo motor (75) drives the second lead screw (76) to push the L-shaped pusher plate (71) forward, the lower mold (66) presses the rotating constraint baffle (36) to slide into the mold moving groove (25) to discharge the material, and then the pusher plate and the baffle are reset in sequence; S6. Transfer the blank to the lower mold (66) and then to the sintering process. After replacing the blank with a new empty mold, repeat the process to achieve continuous automated batch forming.

2. A static pressing molding equipment for microcrystalline plate-shaped corundum products, characterized in that, include: The hydrostatic assembly (1) is used to hydraulically drive the hydrostatic mold (6). When the hydrostatic assembly (1) pressurizes the hydrostatic mold (6) to the set pressure, the hydrostatic assembly (1) continuously compensates for the internal pressure loss of the oil circuit and maintains the pressure applied by the hydrostatic assembly (1) within the set range. The pressure-resistant component (2) is fixedly installed inside the static pressure component (1). The pressure-resistant component (2) counteracts the excess pressure output by the static pressure component (1) by passively contracting, and maintains the pressure output to the pressure-resistant component (2) constant. The first reset component (3) is movably sleeved on the anti-compression component (2), and the first reset component (3) provides limiting constraints on both sides of the standard specification pressing mold; Second reset assembly (4), the second reset assembly (4) is fixedly installed on the static pressure assembly (1), and a lifting constraint plate (44) is movably sleeved on the second reset assembly (4). The lifting constraint plate (44) can enable the static pressure assembly (1) to move up and down synchronously within a certain limit when hydraulically driven; Limiting component (5), the limiting component (5) is fixedly installed on the lower surface of the lifting constraint plate (44), the limiting component (5) is used to control the placement position and amount of corundum powder; The static pressure mold (6) is divided into two parts, which are respectively fixedly installed on the inner side of the static pressure component (1) and the upper surface of the anti-compression component (2). The static pressure mold (6) is used to contain corundum powder and press it. The pusher assembly (7) is fixedly installed inside the static pressure assembly (1). After the static pressure mold (6) is pressed, the pusher assembly (7) is used to push out the movable pressing mold and the corundum product inside.

3. The static pressing equipment for microcrystalline plate-shaped corundum products according to claim 2, characterized in that: The static pressure assembly (1) includes a pressing fixed platform (11), a support fixed rod (12), a hydraulic drive box (13), a limiting support plate (14), and a hydraulic telescopic rod (15). Multiple support fixed rods (12) are fixedly provided on the upper surface of the pressing fixed platform (11). A hydraulic drive box (13) is fixedly provided at one end of the support fixed rod (12) away from the pressing fixed platform (11). A hydraulic telescopic rod (15) is fixedly provided on the lower surface of the hydraulic drive box (13). A limiting support plate (14) is fixedly provided on the support fixed rod (12). The limiting support plate (14) is fixedly sleeved on the outer wall of the hydraulic telescopic rod (15).

4. The static pressing equipment for microcrystalline plate-shaped corundum products according to claim 3, characterized in that: The anti-compression component (2) includes a pressing fixing seat (21), a constraint limiting groove (22), a guide connecting column (23), an anti-compression spring (24), a mold moving groove (25), a drive mounting groove (26), and a telescopic constraint groove (27). The pressing fixing seat (21) is fixedly installed on the upper surface of the pressing fixing table (11). The pressing fixing seat (21) has the constraint limiting groove (22), the mold moving groove (25), the drive mounting groove (26), and the telescopic constraint groove (27). The constraint limiting groove (22) is fixedly provided with the guide connecting column (23), and the anti-compression spring (24) is movably sleeved on the guide connecting column (23).

5. The static pressing equipment for microcrystalline plate-shaped corundum products according to claim 4, characterized in that: The first reset assembly (3) includes a lifting reset platform (31), a plug-in constraint groove (32), a rotating constraint column (33), a rotating sleeve (34), a movable constraint plate (35), a constraint baffle (36), a fixed connecting plate (37), and a fixed plug-in groove (38). The lifting reset platform (31) is movably plugged into the guide connecting column (23). The end of the anti-compression spring (24) away from the pressing fixed platform (11) abuts against the lifting reset platform (31). Two fixed connecting plates (37) are fixedly provided on the upper surface of the lifting reset platform (31). The fixed connecting plate (37) has a fixed plug-in groove (38). The lifting reset platform (31) has a plug-in constraint groove (32). The rotating constraint column (33) is fixedly provided inside the plug-in constraint groove (32).

6. The static pressing equipment for microcrystalline plate-shaped corundum products according to claim 5, characterized in that: A rotating sleeve (34) is movably sleeved on the rotating constraint column (33). A movable constraint plate (35) and a constraint baffle (36) are fixedly provided on the rotating sleeve (34). Multiple return springs are provided inside the insertion constraint groove (32). One end of each return spring is fixedly connected to the movable constraint plate (35). The constraint baffle (36) is horizontally set when no external force is applied. The constraint baffle (36), the lifting reset platform (31), and the mold moving groove (25) are on the same plane.

7. The static pressing equipment for microcrystalline plate-shaped corundum products according to claim 6, characterized in that: The second reset assembly (4) includes a reset support base (41), a reset support column (42), a constraint fixing block (43), a lifting constraint plate (44), and a lifting spring (45). The reset support base (41) is fixedly installed on the upper surface of the pressing fixing base (21). Multiple reset support columns (42) are fixedly provided on the upper surface of the reset support base (41). A constraint fixing block (43) is fixedly provided at the same height on each reset support column (42). The lifting constraint plate (44) is movably sleeved between the constraint fixing block (43) and the reset support base (41). The lifting spring (45) is movably sleeved on the reset support column (42) and is located between the lifting constraint plate (44) and the reset support base (41).

8. The static pressing equipment for microcrystalline plate-shaped corundum products according to claim 7, characterized in that: The limiting component (5) includes a transverse connecting plate (51), a longitudinal insert plate (52), a limiting baffle (53), a lead screw (54), a feeding box (55), a feeding trough (56), a servo motor (57), and a feeding port (58). Limiting baffles (53) are fixedly mounted on the lower surfaces of the two lifting constraint plates (44), and a transverse connecting plate (51) is fixedly mounted between the two limiting baffles (53). A longitudinal insert plate (52) is fixedly mounted on the lower surface of the transverse connecting plate (51), and a lead screw (54) is movably mounted on the limiting baffle (53). A servo motor (57) is fixedly installed on one side of the limiting baffle (53). One end of the servo motor (57) is fixedly connected to a lead screw (54). A feeding box (55) is fixedly installed on the upper surface of the transverse connecting plate (51). The feeding box (55) is movably sleeved on the lead screw (54). The lead screw (54) and the feeding box (55) are engaged by threads. A feeding groove (56) is opened on the feeding box (55). A feeding connection port (58) is fixedly installed on the outer surface of the feeding box (55). The feeding connection port (58) is connected to the feeding groove (56).

9. The static pressing equipment for microcrystalline plate-shaped corundum products according to claim 8, characterized in that: The static pressure mold (6) includes a static pressure connecting plate (61), an upper mold (62), an exhaust hole (63), an exhaust groove (64), a fixed connecting block (65), and a lower mold (66). The fixed connecting block (65) is fixedly provided on the upper surface of the static pressure connecting plate (61), and the upper mold (62) is fixedly provided on the lower surface of the static pressure connecting plate (61). The upper mold (62) has an exhaust hole (63) on its side. The exhaust hole (63) is connected to the top of the inner side of the upper mold (62). The exhaust groove (64) is opened on the static pressure connecting plate (61) to prevent the air holes outside the exhaust hole (63) from being unable to exhaust.

10. The static pressing equipment for microcrystalline plate-shaped corundum products according to claim 9, characterized in that: The pushing assembly (7) includes an L-shaped pushing plate (71), a threaded sleeve (72), a protective baffle (73), a support connecting plate (74), a second servo motor (75), a second lead screw (76), and an auxiliary guide rod (77). The L-shaped pushing plate (71) is movably inserted into the inner side of the telescopic constraint groove (27). The threaded sleeve (72) is movably provided on the L-shaped pushing plate (71). The protective baffle (73) is fixedly provided on the upper surface of the drive mounting groove (26). The support connecting plate (74) is fixedly provided between the protective baffle (73) and the pressing fixing seat (21). 4) A second lead screw (76) is movably mounted on the support connecting plate (74). One end of the second lead screw (76) is movably inserted into the inner side of the threaded sleeve (72). The second lead screw (76) and the threaded sleeve (72) are engaged by threads. A second servo motor (75) is fixedly mounted on one side of the support connecting plate (74). One end of the second servo motor (75) is fixedly connected to the second lead screw (76). Two auxiliary guide rods (77) are fixedly mounted on the protective baffle (73). The auxiliary guide rods (77) are movably inserted into the L-shaped pusher plate (71).

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