A ceramic wedge blank dry pressing apparatus

Abstract

The application discloses a kind of ceramic wedge blank dry pressing equipment, belong to ceramic wedge manufacturing technical field, with feeding structure, feeding structure includes powder feeding part and pressing power part, powder feeding part includes hopper, the lower end of hopper is provided with feeding pipeline, feeding pipeline is communicated with extrusion channel by adapter;The inner wall of feeding pipeline and extrusion channel is coated or compounded with low surface energy layer to form low-adhesion lining pipe, and a pipe is provided on the feeding pipeline, the pipe is close to adapter and is set downward;Cleaning device is arranged in feeding pipeline.Provide a kind of not only can realize uniform filling of powder, can also ensure that blank is sintered from source low deformation, high mechanical property synergistic dry pressing device.

Description

Technical Field

[0001] This application belongs to the field of ceramic chopping tool manufacturing technology, and specifically relates to a synergistic dry pressing device that combines a specific powder formulation with optimized dry pressing equipment for preparing low-deformation, high-performance ceramic chopping tool blanks. Background Technology

[0002] As a key tool in the wire bonding process of microelectronic packaging, ceramic wedges have precise micro-channels inside, requiring extremely high density uniformity, dimensional accuracy, and surface quality in the blank. Dry pressing is the core process in the manufacturing of ceramic wedge blanks, and its forming quality directly determines the performance and yield of the final product.

[0003] Ceramic chopping blanks are typically formed using dry pressing. Existing technology, as disclosed in CN118617555A, addresses uneven powder filling and clogging issues by improving the powder feeding mechanism through high-frequency reciprocating motion in the powder transfer chamber, thus improving the uniformity of blank density to some extent. However, significant drawbacks remain: the powder feeding path still relies on the natural flowability and mechanical vibration of the powder, posing a risk of adhesion, accumulation, and bridging at pipe bends and joints. Secondly, the equipment lacks a proactive and efficient online cleaning mechanism; once clogging occurs, shutdown and disassembly are often required, severely impacting production continuity and efficiency.

[0004] As can be seen from the above, there is an urgent need in this field for an innovative dry pressing device that can not only adapt to the new generation of high-performance ceramic powders, but also fundamentally solve the problems of powder adhesion and blockage during the conveying process, so as to achieve stable, continuous, efficient and high-quality molding. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a collaborative dry pressing device that can not only achieve uniform filling of powder, but also ensure low deformation and high mechanical properties of the blank after sintering from the source.

[0006] To achieve the above technical objectives, the following technical solution is provided: a dry pressing device for ceramic cleaver blanks, comprising a feeding structure including a powder feeding section and a pressing power section. The powder feeding section includes a feeding hopper, and a feeding pipe is provided at the lower end of the feeding hopper. The feeding pipe is connected to an extrusion channel via a connector. The inner walls of the feeding pipe and the extrusion channel are coated or laminated with a low surface energy layer to form a low-adhesion inner liner. Furthermore, a clearing pipe is provided on the feeding pipe, which is located near the connector and downwards. A cleaning device is provided inside the feeding pipe. The cleaning device includes a traction mechanism and a cleaning trolley connected to the traction mechanism. The cleaning trolley includes a rotating shaft connected to the bearing of the traction mechanism, and cleaning blades are installed on the rotating shaft. The top edge of the cleaning blades contacts the feeding pipe. A motor is installed at the end of the rotating shaft, and the motor is installed inside the outer casing. The outer casing is enclosed, and a battery module and a communication control module are installed inside the outer casing behind the motor. The battery module is electrically connected to the motor to provide power to the motor, and the communication control module is electrically connected to an external controller to control the start and stop of the motor.

[0007] In one feasible embodiment, the outer casing is provided with at least two sets of positioning wheel groups arranged front and rear, each set of positioning wheel groups including at least three positioning wheels that are evenly distributed and connected as one unit; the positioning wheels can rotate backward, and one of the positioning wheels achieves linkage between the front and rear positioning wheel groups through a connecting rod.

[0008] In one feasible implementation, the traction mechanism includes a traction rope that passes through a feeding pipe and a clearing pipe before connecting to an external winding mechanism.

[0009] In one feasible configuration, the extrusion channel is vertically oriented, and the feeding hopper is positioned near the top of the extrusion channel, with the feeding pipe connected to the extrusion channel at an angle of 40°-50°.

[0010] In one feasible embodiment, the forming power unit includes a pair of telescopic rods and a pair of guide rods, which are arranged around the extrusion channel to form a square, and the pair of telescopic rods and the pair of guide rods are arranged diagonally.

[0011] In an feasible embodiment, the forming power unit also includes a support base, which includes a central seat for fixing the extrusion channel, side seats for the left and right sides of the central seat, and fixed ears for fixing to the telescopic rod and sliding ears for being sleeved on the guide rod for the front and rear of the side seats, respectively. A support rod is installed inside the side seat, and a motor base is fixed on the support rod. A servo motor is fixed on the motor base, and the servo motor is connected to an extrusion rod that extends into the extrusion channel via a coupling.

[0012] In one feasible implementation, the extruder tip has a sharp angle, with the top of the angle forming a small rounded corner, the radius R of which is between 0.1mm and 0.2mm. This rounded corner design guides the powder to shrink smoothly towards the center.

[0013] In one feasible embodiment, the feed hopper contains high-performance ceramic cleaver dry-pressed powder, which comprises the following raw materials by weight percentage: α-Al₂O₃ 90.5%, nano-SiO₂ 4%, MgO 0.8%, Y₂O₃ 0.5%, ZrO₂ 1.2%, Cr₂O₃ 0.3%, PVA 0.9%, PEG 0.8%, and water 1%.

[0014] This invention achieves a synergistic effect by combining optimized dry pressing equipment with a specialized low-deformation powder formulation: The equipment employs a three-layer cleaning system. First, by installing low-adhesion linings on the inner walls of the feeding pipe and extrusion channel, the adhesion between powder and the pipe wall is significantly reduced at a physical level, minimizing the formation of adhering substances at the source. Next, a downward-sloping unblocking pipe is installed near the connection points most prone to clogging. This design can be connected to a pulsed gas backflushing device or a negative pressure suction device, enabling targeted and proactive intervention and removal of blockages at their inception, nipping problems in the bud. Finally, an intelligent cleaning trolley that can move within the pipes is installed. When the equipment operates for a certain period or detects abnormal flow, this trolley can be activated; its rotating cleaning blades powerfully scrape away the extremely thin layer of powder or slight crust that is difficult to avoid accumulating over time even on the low-adhesion lining, achieving online, non-destructive, and deep cleaning of the pipes.

[0015] The organic additives PVA and PEG in its specialized powder formulation improve the powder's flowability and adhesion, making it easier to disperse and flow evenly under the high-frequency reciprocating motion of the powder feeding section. This further enhances the uniform filling effect of the equipment and effectively avoids bridging and clogging. Other additives such as nano-SiO2, Y2O3, and ZrO2 effectively inhibit abnormal grain growth and promote sintering densification, thereby significantly reducing the deformation rate of the blank during sintering. Combined with the initial density uniformity provided by the equipment, the shrinkage of all parts of the blank is consistent, and the deformation rate can be reduced to about 0.21%, far lower than traditional methods. The phase transformation toughening effect of ZrO2, combined with the uniform microstructure, results in ceramic wedges with higher bending strength, fracture toughness, and hardness in the final sintered product.

[0016] This collaborative solution ensures product quality from both powder and equipment perspectives, significantly reducing waste caused by sintering deformation and uneven density, and improving production yield and overall efficiency. Attached Figure Description

[0017] 1. Powder feeding section; 2. Compression power unit; 3. Cleaning device; 11. Feeding hopper; 12. Feeding pipe; 13. Connector; 14. Extrusion channel; 15. Low-adhesion inner liner; 16. Unclogging pipe. 21 Telescopic rod, 22 Guide rod, 23 Support base, 230 Center seat, 231 Side seat, 232 Fixed ear, 234 Sliding ear, 235 Support rod, 236 Motor base, 237 Servo motor, 238 Extrusion rod 31 Traction mechanism, 32 Cleaning trolley, 320 Shaft, 321 Cleaning blade, 322 Motor, 323 Outer casing, 324 Positioning wheel set, 325 Positioning wheel. Figure 1 This is a schematic diagram of the overall structure of the dry pressing equipment; Figure 2 This is a schematic diagram of the feeding structure; Figure 3 This is a front view of the feeding structure; Figure 4 for Figure 3 Sectional view at point AA; Figure 5 This is a schematic diagram of the cleaning device. Detailed Implementation

[0018] like Figure 1-5 The embodiment shown provides a dry pressing device for ceramic cleaver blanks, which includes a feeding structure comprising a powder feeding section 1 and a pressing power section 2. The powder feeding section 1 includes a feeding hopper 11, and a feeding pipe 12 is provided at the lower end of the feeding hopper 11. The feeding pipe 12 is connected to an extrusion channel 14 via a connector 13. The inner walls of the feeding pipe 12 and the extrusion channel 14 are coated or laminated with a low surface energy layer to form a low-adhesion inner liner 15. A clearing pipe 16 is provided on the feeding pipe 12, which is close to the connector 13 and downwardly positioned. A cleaning device 3 is provided inside the feeding pipe 12. The cleaning device 3 includes a traction mechanism 31 and a cleaning trolley 32 connected to the traction mechanism 31. The cleaning trolley 32 includes a rotating shaft 320 connected to the bearing of the traction mechanism 31. A cleaning blade 321 is provided on the rotating shaft 320, and the top edge of the cleaning blade 321 contacts the feeding pipe 12. A motor 322 is provided at the end of the rotating shaft 320 and is located inside the outer casing 323. The outer casing 323 is enclosed, and a battery module and a communication control module are provided inside the outer casing 323 behind the motor 322. The battery module is electrically connected to the motor 322 to provide power to the motor 322, and the communication control module is electrically connected to an external controller to control the start and stop of the motor 322.

[0019] In this embodiment, the outer casing 323 is provided with two sets of positioning wheel groups 324 arranged front and rear. Each set of positioning wheel groups 324 includes three positioning wheels 325 that are evenly distributed and connected as one unit. The positioning wheels 325 can rotate backward, and one of the positioning wheels 325 can achieve linkage between the front and rear positioning wheel groups 324 through a connecting rod.

[0020] In this embodiment, the traction mechanism 31 includes a traction rope, which is connected to the external winding mechanism after passing through the feeding pipe 12 and the unblocking pipe 16.

[0021] The cleaning trolley in this embodiment is an automated pipeline cleaning robot integrating mechanical motion, power supply, and intelligent control. Its working principle can be divided into three core components: travel positioning, rotational cleaning, and intelligent control. Through these principles, it achieves online, in-depth, and non-destructive cleaning of the feeding pipeline 12. The cleaning trolley achieves reciprocating motion within the pipeline via a traction mechanism 31, which preferably uses a high-strength flexible traction rope, such as steel wire rope or Kevlar rope. One end of the traction rope is fixed to the trolley body, and the other end passes through the entire feeding pipeline 12 and the unblocking pipeline 16, ultimately connecting to an external winding mechanism. When a cleaning task needs to be performed, the external winding mechanism is activated, precisely pulling or releasing the cleaning trolley by retracting or extending the traction rope, allowing it to travel from one end of the feeding pipeline 12 to the other.

[0022] To ensure the trolley does not roll over, veer, or jam during travel and cleaning, its outer casing 323 is equipped with two sets of positioning wheel groups 324 positioned front and rear. Each positioning wheel group 324 consists of three evenly distributed positioning wheels 325, which are arranged at 120° on a plane. This structure ensures that the trolley remains centered within the circular pipe cross-section. Regardless of the trolley's posture, all three wheels maintain contact with the pipe wall, preventing the trolley body from scraping against the pipe wall and withstanding the reverse torque generated by the cleaning blades 321 during operation. One of the positioning wheels 325 is linked to the front and rear positioning wheel groups 324 via a connecting rod. This allows the movement of a wheel in the front group when it encounters a small protrusion or depression in the pipe wall to be transmitted to the corresponding wheel in the rear group via the connecting rod, resulting in coordinated adaptive deformation between the front and rear wheel groups. This greatly improves the trolley's ability to overcome small obstacles inside the pipe and enhances its smoothness of movement. Furthermore, the friction between the positioning wheel 325 and the pipe wall prevents it from rotating, effectively locking it and ensuring stable forward movement of the trolley. When the task is completed and the trolley needs to return to the starting position, the wheels can rotate backward under the push of the traction rope to facilitate its reset.

[0023] In this embodiment, the cleaning blade 321 rotates and scrapes the pipe wall. When the trolley reaches a designated position or moves at a constant speed throughout the pipe, the control system activates the motor. The motor 322 drives the cleaning blade 321 to rotate at high speed via the rotating shaft 320. Supported by the positioning wheel assembly 324, the top edge of the cleaning blade 321 maintains a slight and constant contact pressure with the inner wall of the low-adhesion liner 15. This effectively removes both slightly adhered powder layers and more stubborn crusts formed due to moisture or static electricity from the pipe wall. The scraped-off powder is carried by the rotating airflow and pushed to the outlet along the direction of the cleaning trolley's movement, ultimately being discharged from the system through the unblocking pipe 16.

[0024] The entire cleaning process is managed by an intelligent control system, achieving automation and programmability. The vehicle's built-in battery module provides power to the 322 motor and communication control module, eliminating the need for external cables and allowing for greater freedom of movement. The communication control module maintains a wireless connection with the device's main controller, receiving commands and providing status feedback.

[0025] In this embodiment, the extrusion channel 14 is arranged vertically, and the feeding hopper 11 is located near the top of the extrusion channel 14. The feeding pipe 12 is connected to the extrusion channel 14 at an angle of 40°-50°. Preferably, the feeding pipe 12 is at 45° to the extrusion channel 14.

[0026] In this embodiment, the forming power unit 2 includes a pair of telescopic rods 21 and a pair of guide rods 22. The telescopic rods 21 and guide rods 22 are arranged around the extrusion channel 14 to form a square, and the pair of telescopic rods 21 and the pair of guide rods 22 are respectively arranged diagonally.

[0027] In this embodiment, the forming power unit 2 further includes a support base 23. The support base 23 includes a central seat 230 for fixing the extrusion channel 14. Side seats 231 are respectively provided on the left and right sides of the central seat 230. Fixed ears 232 fixed to the telescopic rod 21 and sliding ears 234 sleeved on the guide rod 22 are respectively provided at the front and rear of the side seats 231. A support rod 235 is provided inside the side seat 231. A motor base 236 is fixed on the support rod 235. A servo motor 237 is fixed on the motor base 236. The servo motor 237 is connected to an extrusion rod 238 that extends into the extrusion channel 14 via a coupling.

[0028] In this embodiment, the extruder 238 has a pointed end with a small rounded tip. The radius R of the rounded tip is between 0.1 mm and 0.2 mm. The rounded tip design guides the powder to shrink smoothly towards the center.

[0029] In the above embodiment, the feeding hopper 11 contains high-performance ceramic chopping knife dry-pressed powder, which includes the following raw materials by weight percentage: α-Al2O3 90.5%, nano SiO2 4%, MgO 0.8%, Y2O3 0.5%, ZrO2 1.2%, Cr2O3 0.3%, PVA 0.9%, PEG 0.8%, and water 1%.

[0030] In the description of this specification, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing the technical solution of this patent and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this patent application.

[0031] In this specification, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this specification according to the specific circumstances.

[0032] In this specification, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0033] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0034] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A dry pressing device for ceramic cleaver blanks, comprising a feeding structure, characterized in that, The feeding structure includes a powder feeding section (1) and a molding power section (2). The powder feeding section (1) includes a feeding hopper (11). The lower end of the feeding hopper (11) is provided with a feeding pipe (12). The feeding pipe (12) is connected to the extrusion channel (14) through a connector (13). The inner walls of the feeding pipe (12) and the extrusion channel (14) are coated or composite with a low surface energy layer to form a low-adhesion inner liner (15), and a blockage clearing pipe (16) is provided on the feeding pipe (12), the blockage clearing pipe (16) being close to the connector (13) and downwardly positioned. A cleaning device (3) is installed inside the feeding pipe (12); the cleaning device (3) includes a traction mechanism (31) and a cleaning trolley (32) connected to the traction mechanism (31). The cleaning trolley (32) includes a rotating shaft (320) connected to the bearing of the traction mechanism (31), and a cleaning blade (321) is provided on the rotating shaft (320). The top edge of the cleaning blade (321) contacts the feeding pipe (12). A motor (322) is provided at the end of the rotating shaft (320), and the motor (322) is located inside the outer casing (323). The outer casing (323) is enclosed, and a battery module and a communication control module are provided inside the outer casing (323) behind the motor (322). The battery module is electrically connected to the motor (322) to provide power to the motor (322), and the communication control module is electrically connected to an external controller to control the start and stop of the motor (322). The outer casing (323) is provided with at least two sets of positioning wheel sets (324) arranged in front and behind. Each set of positioning wheel sets (324) includes at least three positioning wheels (325) that are evenly distributed and connected as one unit. The positioning wheels (325) can rotate backward, and one of the positioning wheels (325) can achieve linkage between the front and rear positioning wheel sets (324) through a connecting rod. The traction mechanism (31) includes a traction rope, which is connected to an external winding mechanism after passing through the feeding pipe (12) and the unblocking pipe (16). The forming power unit (2) includes a pair of telescopic rods (21) and a pair of guide rods (22). The telescopic rods (21) and the guide rods (22) are arranged around the extrusion channel (14) to form a square, and the pair of telescopic rods (21) and the pair of guide rods (22) are arranged diagonally. The forming power unit (2) also includes a support base (23), the support base (23) includes a center seat (230) for fixing the extrusion channel (14), side seats (231) are respectively provided on the left and right sides of the center seat (230), and the front and rear of the side seats (231) are respectively provided with fixing ears (232) fixed to the telescopic rod (21) and sliding ears (234) sleeved on the guide rod (22). A support rod (235) is provided inside the side seat (231). A motor base (236) is fixed on the support rod (235). A servo motor (237) is fixed on the motor base (236). The servo motor (237) is connected to an extrusion rod (238) that extends into the extrusion channel (14) via a coupling.

2. The dry pressing equipment for ceramic cleaver blanks according to claim 1, characterized in that, The extrusion channel (14) is arranged vertically, and the feeding hopper (11) is located near the top of the extrusion channel (14). The feeding pipe (12) is connected to the extrusion channel (14) at an angle of 40°-50°.

3. The dry pressing equipment for ceramic cleaver blanks according to claim 1, characterized in that, The extrusion rod (238) has a pointed end with a small rounded corner at the top, the radius R of which is between 0.1 mm and 0.2 mm.

4. The dry pressing equipment for ceramic cleaver blanks according to claim 1 or 2, characterized in that, The feeding hopper (11) contains high-performance ceramic cleaver dry-pressed powder, which comprises the following raw materials by weight percentage: α-Al2O3 90.5%, nano SiO2 4%, MgO 0.8%, Y2O3 0.5%, ZrO2 1.2%, Cr2O3 0.3%, PVA 0.9%, PEG 0.8%, and water 1%.

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