A ceramic splitter blank dry pressing device

Abstract

The present invention relates to the technical field of ceramic splitting knife manufacturing, and in particular to a dry pressing device for ceramic splitting knife blanks. The pressing mold is supported by a machine platform, and ceramic powder is supplied to it through a powder feeding part. When the ceramic powder is dropped and filled into the pressing mold, the pressing power part applies pressure to make it a ceramic splitting knife blank, and then it is transferred to the next process through a picking mechanism. The powder storage hopper is connected to the powder transfer bin through a powder conveying hose. Under the driving force of the shaking drive unit, in the large-distance displacement stage, the powder transfer bin is displaced from the initial position to the dropping position until it is aligned with the dropping cavity; and in the micro-high-frequency reciprocating displacement stage, the powder transfer bin performs a micro-high-frequency reciprocating sweeping motion due to the reciprocating force. In this way, on the one hand, the ceramic powders collide violently and are fully mixed during the dropping process, which is conducive to the filling of each partition of the dropping cavity at the same speed and amount; on the other hand, the damp agglomerates are dispersed due to the collision to avoid the dropping cavity being blocked.

Description

Technical Field

[0001] The invention relates to the technical field of ceramic splitting knife manufacturing, in particular to a ceramic splitting knife blank dry pressing device. Background Art

[0002] Ceramic splitters are axially symmetrical ceramic tools with vertical holes. They are precision microstructured ceramic parts. They are wire bonding tools used in the wire bonding process in the field of microelectronics processing and play an extremely important role in packaging technology. The main manufacturing material of ceramic splitters is ceramic powder (including aluminum oxide, silicon oxide, etc.), which is dry-pressed into blanks using a forming mold, and then sintered at high temperature in a high-temperature furnace, and then mechanically finished to produce finished products.

[0003] The working principle of dry pressing is roughly as follows: the ceramic powder is pretreated and then filled into the cavity of the pressing mold, and then axially pressed by means of a pressure device so that the ceramic powders are close to each other and firmly combined into one by means of internal friction, and the ceramic splitting knife blank is formed.

[0004] As far as the current technical status is concerned, during the operation of the dry pressing equipment for ceramic splitting cutter blanks, the lower powder bin is vibrated and shaken at a fixed frequency along a specific direction under the power from the eccentric shaft, and then the ceramic powder is filled into the cavity of the pressing mold with the help of a hose. However, in the specific quality control, it was found that the structural organization form and density of each region inside the finished product were quite different, which easily led to uneven internal stress distribution and even overall bending during the subsequent sintering process. The reasons are mainly the following two aspects: 1) The overall diameter of the cavity of the pressing mold is extremely small (even less than 1.5mm), and according to the process requirements, a smaller wire threading inner hole needs to be formed inside it. During the blanking process, due to the exciting force acting on the lower powder bin, the ceramic powder in the hose only relies on its own gravity to fill the cavity of the pressing mold without any rules, which can easily lead to the phenomenon of inconsistent distribution density of all ceramic powders in various areas of the cavity, and the phenomenon of uneven stacking surface along its radial sectors also occurs from time to time; 2) Due to the characteristics of the material itself, the ceramic powder is very easy to get damp and agglomerate, which is not only not conducive to the uniform blanking of the ceramic powder, but in serious cases, it will even block the cavity. Therefore, it is urgent for technicians to solve the above problems. Summary of the invention

[0005] In order to solve the above technical problems, the present invention relates to a ceramic splitting knife blank dry pressing equipment, including a machine, a press mold, a powder feeding unit, a press power unit and a pick-up mechanism. The press mold is supported by the machine, and ceramic powder is supplied to it through the powder feeding unit. The press power unit is matched with the press mold. After the ceramic powder is filled into the press mold, the press power unit applies pressure to make it a ceramic splitting knife blank, and then it is transferred to the next process through the pick-up mechanism. The powder feeding unit includes a powder storage hopper, a powder conveying hose, a powder transfer bin and a shaking drive unit. The powder storage hopper is connected to the powder transfer bin through the powder conveying hose, and the ceramic powder can enter the powder transfer bin under the action of gravity. The shaking drive unit is used as a power source for the powder transfer bin, and its action process includes a large-distance displacement stage and a micro-high-frequency reciprocating displacement stage. In the large-distance displacement stage, the powder transfer bin moves from the initial position to the blanking position until it is aligned with the blanking cavity of the pressing mold; in the micro-high-frequency reciprocating displacement stage, the powder transfer bin performs a micro-high-frequency reciprocating displacement motion due to the reciprocating force. During this process, the blanking cavity is continuously filled with blanking ceramic powder.

[0006] As a further improvement of the technical solution disclosed in the present invention, the press mold includes an upper template, a middle mold base, a lower template, a guide unit, a female mold, a core rod, a lower mounting seat, a punch rod and an upper mounting seat. The female mold is inserted into the middle mold base, and the blanking cavity is formed therein. The upper template and the lower template are arranged at the upper and lower parts of the middle mold base, respectively, and with the assistance of the guide unit, both perform directional displacement movement toward / backwards from the middle mold base. The core rod uses the lower mounting seat as the insertion basis, and is generally loaded by the lower template. The punch rod uses the upper mounting seat as the insertion basis, and is generally loaded by the upper template, and also performs displacement movement in the up and down directions under the driving force from the press power unit. When the press power unit is started, within a certain period of time, the lower template performs displacement movement toward the middle mold base under the driving force until the lower port of the blanking cavity is blocked by the lower mounting seat. At the same time, the core rod extends into the blanking cavity, and the cavity is formed incidentally. In another time period, the upper mold plate moves toward the middle mold base under the action of driving force, and the punch rod approaches the female mold and slowly enters the blanking cavity. The ceramic powder is pressed and formed into a ceramic chopper blank matching the shape of the cavity.

[0007] As a further improvement of the technical solution disclosed in the present invention, during the stage of ceramic powder dropping from the powder conveying hose and filling into the dropping cavity, the powder transfer bin is maintained in a state of isolation from the outside world.

[0008] As a further improvement of the technical solution disclosed in the present invention, the pressing mold further includes a sweeping plate. The sweeping plate is in contact with the top wall of the middle mold base and is fixed as a whole. When the female mold passes through the sweeping plate and is inserted into the middle mold base, it does not go beyond the sweeping plate. During the stage of ceramic powder being discharged from the powder conveying hose and filling into the discharge cavity, the powder transfer bin and the sweeping plate are maintained in a close contact state.

[0009] As a further improvement of the technical solution disclosed in the present invention, the powder transfer bin includes a bin body and an elastic material blocking ring. The elastic material blocking ring is lined and fixed to the bottom end surface of the bin body, and in the process of ceramic powder falling, it is axially compressed and deformed due to the combined extrusion force from the bin body and the sweeping plate.

[0010] As a further improvement of the technical solution disclosed in the present invention, the material shaking drive unit includes a linear motion element and a connecting transition assembly. The linear motion element is in contact with the top wall of the center mold base and is fixed as a whole in a detachable manner. The connecting transition assembly directly loads the powder transfer bin and alternately performs large-distance displacement and micro-high-frequency reciprocating displacement under the driving action of the linear motion element.

[0011] As a further improvement of the technical solution disclosed in the present invention, the connecting transition assembly includes a cantilever plate, a mounting base plate, a fastening assembly, bolts and a columnar spring. The cantilever plate is directly driven by a linear motion element and is fixed to the mounting base plate as a whole by means of a fastening assembly. The mounting base plate serves as the installation base of the powder transfer bin. The powder transfer bin is assembled with the mounting base plate by means of bolts and columnar springs. During the stage of continuous filling of ceramic powder into the blanking cavity, the powder transfer bin is continuously subjected to the elastic restoring force from multiple columnar springs. Mounting through holes and threaded holes that are compatible with the bolts are respectively provided on the mounting base plate and the powder transfer bin.

[0012] As a further improvement of the technical solution disclosed in the present invention, the connection transition assembly further includes a limit screw, which is used to limit the maximum value of the distance d1 between the powder transfer bin and the sweeping plate, and uses the mounting base plate as the insertion basis.

[0013] As a further improvement of the technical solution disclosed in the present invention, according to different installation positions, the guide unit is divided into an upper guide subunit matched with the upper template and a lower guide subunit matched with the lower template. The upper guide subunit is composed of a plurality of slide rail and slider assemblies. The lower guide subunit is composed of a plurality of guide column and guide sleeve assemblies.

[0014] As a further improvement of the technical solution disclosed in the present invention, the profiling power unit includes an upper profiling power sub-unit and a lower profiling power sub-unit, which are used to drive the upper mold plate and the lower mold plate to perform displacement movement toward / away from the middle mold base in a one-to-one correspondence.

[0015] As a further improvement of the technical solution disclosed in the present invention, the upper extrusion power sub-unit includes an upper cylinder. The piston rod of the upper cylinder is directly connected to the upper mounting seat. The lower extrusion power sub-unit includes a lower cylinder, a connecting transition seat, a floating self-aligning sleeve and a self-aligning power unit. The connecting transition seat is detachably fixed to the bottom wall of the lower template, and is provided with a mounting cavity for loading the floating self-aligning sleeve. The floating self-aligning sleeve serves as a connecting transition between the connecting transition seat and the piston rod of the lower cylinder. It is installed in the mounting cavity and can freely perform circumferential rotation when subjected to the rotational torque from the self-aligning power unit.

[0016] As a further improvement of the technical solution disclosed in the present invention, the piston rod of the lower cylinder is fixed to the floating self-aligning sleeve by a locking nut. The self-aligning power unit includes a servo motor and a synchronous belt transmission mechanism. The servo motor is installed on one side of the lower cylinder and outputs a rotational torque through the synchronous belt transmission mechanism, so that the piston rod of the lower cylinder and the floating self-aligning sleeve can synchronously perform a small-angle circumferential rotation motion.

[0017] As a further improvement of the technical solution disclosed in the present invention, the picking mechanism includes a first cylinder, a support seat, a bearing base and an elastic clamp. The support seat is fixed on the top wall of the center mold base. The first cylinder uses the support seat as an assembly base. The bearing base is also fixed on the top wall of the center mold base and serves as an assembly base for the elastic clamp. In the process of performing the ceramic splitting knife blank holding operation, the elastic clamp performs a yaw motion due to the push force from the first cylinder. At the same time, the first cylinder adaptively performs a yaw motion due to the reverse force, so that the elastic clamp is able to approach and elastically clamp the ceramic splitting knife blank.

[0018] As a further improvement of the technical solution disclosed in the present invention, the elastic clamp includes a load-bearing sheet metal, a second cylinder, a first plate-like elastic finger and a second plate-like elastic finger. The load-bearing sheet metal is assembled on a bearing base, and performs a yaw motion due to the push force from the first cylinder. The first plate-like elastic finger and the second plate-like elastic finger are respectively detachably mounted on both sides of the load-bearing sheet metal, and are opposite to each other along the width direction of the load-bearing sheet metal. The second cylinder uses the load-bearing sheet metal as an installation base and penetrates the load-bearing sheet metal. In the process of the piston rod of the second cylinder performing a backward / forward movement, the gap value d2 formed between the first plate-like elastic finger and the second plate-like elastic finger is synchronously reduced / expanded, so as to realize / release the elastic clamping of the ceramic splitting knife blank.

[0019] The working principle of the ceramic splitting knife blank dry pressing equipment disclosed in the present invention is roughly as follows: first, the ceramic powder is pretreated and modified, and then it is filled into the powder storage hopper, and is continuously fed to the powder transfer bin through the powder conveying hose under the action of gravity. At the same time, the powder transfer bin is translated from the initial position to the blanking position (aligned with the blanking cavity of the pressing mold) under the driving force of the shaking drive unit. Subsequently, the powder transfer bin continuously performs a slight high-frequency reciprocating sweeping motion around the blanking hole of the blanking cavity under the action of the shaking drive unit, and in this process, the feed port of the blanking cavity is always covered by the blanking range of the powder transfer bin until the blanking cavity is filled with ceramic powder. Then, the pressing power unit acts to apply axial pressure to the blanking cavity, so that the ceramic powders are close to each other and are firmly combined into one by means of internal friction, so that the ceramic splitting knife blank is formed.

[0020] Compared with the ceramic splitting knife blank dry pressing equipment with traditional design structure, in the technical solution disclosed in the present invention, during the blanking and filling process, the powder transfer bin which is directly responsible for supplying ceramic powder performs a slight high-frequency reciprocating sweeping motion within a set time period due to the reciprocating force from the shaking drive unit, and always surrounds the blanking cavity area of ​​the pressing mold until the blanking cavity is filled with ceramic powder. The ceramic powder is always maintained in a high-frequency motion state in the powder transfer bin and has sufficient kinetic potential energy in the lateral direction. Thus, on the one hand, at the moment of entering the blanking cavity, the ceramic powder not only has a downward acceleration under the action of its own gravity, but also has a lateral acceleration due to the action of kinetic potential energy. The ceramic powders are bound to collide violently and be fully mixed, which is conducive to the filling of each partition of the blanking cavity at the same speed and in the same amount, thereby ensuring that the distribution density of the ceramic powder in each area tends to be equal and the height of the stacking surface of the sector partition is similar; on the other hand, because the ceramic powder collides violently in the powder transfer bin, even if it agglomerates due to moisture, its size will be reduced or even completely dispersed, thereby effectively avoiding the occurrence of accidental blockage of the feeding port of the blanking cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a three-dimensional schematic diagram of the dry pressing equipment for ceramic splitting knife blanks disclosed in the present invention.

[0023] Figure 2 It is a three-dimensional schematic diagram from one perspective of the dry pressing equipment for ceramic splitting knife blanks disclosed in the present invention (with the machine platform hidden).

[0024] Figure 3 It is a three-dimensional schematic diagram from another perspective of the ceramic splitting knife blank dry pressing equipment disclosed in the present invention (with the machine platform hidden).

[0025] Figure 4 It is a schematic diagram of the state when the pressing mold and the pressing power part in the ceramic splitter blank dry pressing equipment disclosed by the present invention are used in a matching manner.

[0026] Figure 5 yes Figure 4 Front view of .

[0027] Figure 6 yes Figure 5 AA section view.

[0028] Figure 7 yes Figure 6 A partial enlarged view of I.

[0029] Figure 8 yes Figure 6 A partial enlarged view of II.

[0030] Fig. 9 The present invention is a schematic diagram of the layout and orientation of a powder transfer bin, a material shaking drive unit and a pick-up mechanism relative to a central die base in the ceramic splitting knife blank dry pressing device disclosed in the present invention.

[0031] Fig.10 It is a schematic diagram of the state after the material shaking drive unit and the powder transfer bin in the ceramic splitting knife blank dry pressing equipment disclosed in the present invention are assembled.

[0032] Fig.11 It is a three-dimensional schematic diagram of the connection transition assembly in the ceramic splitting knife blank dry pressing equipment disclosed in the present invention (the powder transfer bin is shown in the form of hidden lines).

[0033] Fig.12 yes Fig.11 Front view of .

[0034] Fig.13 It is a schematic diagram of the state of the centering power unit in the ceramic splitting cutter blank dry pressing equipment disclosed in the present invention after being assembled relative to the lower cylinder.

[0035] Fig.14 It is a three-dimensional schematic diagram from one viewing angle of a take-up mechanism in the ceramic splitting knife blank dry pressing device disclosed in the present invention.

[0036] Fig.15 It is a three-dimensional schematic diagram of another viewing angle of the piece taking mechanism in the ceramic splitting knife blank dry pressing device disclosed in the present invention.

[0037] 1-machine platform; 2-pressing mold; 21-upper mold plate; 22-middle mold base; 23-lower mold plate; 24-guide unit; 241-upper guide subunit; 242-lower guide subunit; 25-female mold; 251-blank cavity; 252-mold cavity; 26-mold core rod; 27-lower mounting seat; 28-mold punch rod; 29-upper mounting seat; 210-sweep plate; 3-powder delivery part; 31-powder storage hopper; 32-powder delivery hose; 33-powder transfer bin; 34-shaking drive unit; 341-slide cylinder; 342-connection transition assembly; 3421-cantilever plate; 3422-mounting base plate; 3423-fastening assembly; 3424-bolt; 3425-columnar spring; 3426-limit screw; 4-pressing power unit; 41-upper press power sub-unit; 411-upper cylinder; 42-lower press power sub-unit; 421-lower cylinder; 422-connection Transition seat; 423-floating self-aligning sleeve; 424-self-aligning power unit; 4241-servo motor; 4242-synchronous belt transmission mechanism; 425-locking nut; 5-removal mechanism; 51-first cylinder; 52-support seat; 53-bearing base; 54-elastic clamp; 541-load-bearing sheet metal; 542-second cylinder; 543-first plate-like elastic finger; 544-second plate-like elastic finger. DETAILED DESCRIPTION

[0038] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "left", "right", "front", "back", "up", "down", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0039] The following is a further detailed description of the present invention in conjunction with specific embodiments. Figure 1 , Figure 2 The three-dimensional schematic diagrams of the dry pressing equipment for ceramic splitting knife blanks disclosed in the present invention are respectively shown in two different states. It can be seen that it is mainly composed of several parts such as a machine 1, a pressing mold 2, a powder feeding part 3, a pressing power part 4 and a pick-up mechanism 5. Among them, the pressing mold 2 is the main body of the equipment, which is used to dry-press and form ceramic splitting knife blanks. It is supported by the machine 1 and is supplied with ceramic powder through the powder feeding part 3. The pressing power part 4 is matched with the pressing mold 2 to output axial pressure for forming. When the ceramic powder is filled into the pressing mold 2, the pressing power part 4 applies pressure to make it a ceramic splitting knife blank, and then it is transferred to the next process through the pick-up mechanism 5.

[0040] like Figure 3As shown in the figure, the powder delivery section 3 is mainly composed of several parts such as a powder storage hopper 31, a powder delivery hose 32, a powder transfer bin 33 and a material shaking drive unit 34. Among them, the powder storage hopper 31 is connected with the powder transfer bin 33 by means of the powder delivery hose 32, and the ceramic powder is able to enter the powder transfer bin 33 under the action of its own gravity. The material shaking drive unit 34 is used as a power source for the powder transfer bin 33, and its action process includes a large-distance displacement stage and a micro-high-frequency reciprocating displacement stage. In the large-distance displacement stage, the powder transfer bin 33 is displaced from the initial position to the blanking position until it is aligned with the blanking cavity 251 (molded in the female mold 25, as shown in FIG. 2 ) of the pressing mold 2. Figure 7 In the micro-high-frequency reciprocating displacement stage, the powder transfer bin 33 performs a micro-high-frequency reciprocating sweeping motion around the blanking cavity 251 due to the reciprocating force. During this process, the blanking cavity 251 is gradually filled with ceramic powder in a continuously blanking state (as shown in FIG. Fig. 9 ).

[0041] The working principle of the dry pressing equipment for ceramic splitting knife blanks is roughly as follows: first, the ceramic powder is pretreated and modified, and then it is filled into the powder storage hopper 31, and is continuously fed to the powder transfer bin 33 through the powder conveying hose 32 under the action of gravity. At the same time, the powder transfer bin 33 is translated from the initial position to the blanking position (aligned with the blanking cavity 251 of the pressing mold 2) under the action of the shaking drive unit 34. Subsequently, the powder transfer bin 33 continues to perform a slight high-frequency reciprocating sweeping motion around the blanking cavity 251 area under the action of the shaking drive unit 34, and in this process, the feed port of the blanking cavity 251 is always covered by the blanking range of the powder transfer bin 33 until the blanking cavity 251 is filled with ceramic powder, and then, the pressing power unit 4 acts to apply axial pressure to the blanking cavity 251, so that the ceramic powders are close to each other and firmly combined into one by means of internal friction, and the ceramic splitting knife blank is formed.

[0042] During the material filling process, the powder transfer bin 33, which is directly responsible for the ceramic powder supply task, performs a slight high-frequency reciprocating sweeping motion within a set time period due to the reciprocating force from the material shaking drive unit 34, and always surrounds the material filling cavity 251 area until the material filling cavity 251 is filled with ceramic powder. The ceramic powder is always maintained in a high-frequency motion state in the powder transfer bin 33 and has sufficient kinetic potential energy in the lateral direction. Thus, on the one hand, at the moment of entering the blanking cavity 251, the ceramic powder not only has a downward acceleration under the action of its own gravity, but also has a lateral acceleration due to the action of the kinetic potential energy. The ceramic powders are bound to collide violently and be fully mixed, which is conducive to the filling of each partition of the blanking cavity 251 at the same speed and in the same amount, thereby ensuring that the distribution density of the ceramic powder in each area tends to be equal and the height of the stacking surface of the sector partition is similar; on the other hand, because the ceramic powder collides violently in the powder transfer bin 33, even if it agglomerates due to moisture, its size will be reduced or even completely dispersed, thereby effectively preventing the inlet of the blanking cavity 251 from being accidentally blocked.

[0043] like Figure 4 , 5 As shown in FIGS. 6 and 7, the press mold 2 is mainly composed of an upper mold plate 21, a middle mold base 22, a lower mold plate 23, a guide unit 24, a female mold 25, a core rod 26, a lower mounting seat 27, a punch rod 28 and an upper mounting seat 29. Among them, the female mold 25 is inserted into the middle mold base, and the blanking cavity 251 is formed therein. The upper mold plate 21 and the lower mold plate 23 are arranged at the upper and lower sides of the middle mold base 22, respectively, and with the assistance of the guide unit 24, both perform directional displacement movement toward / backwards from the middle mold base 22. The core rod 26 uses the lower mounting seat 27 as the insertion basis, and is generally loaded by the lower mold plate 23. The punch rod 28 uses the upper mounting seat 29 as the insertion basis, and is generally loaded by the upper mold plate 21, and also performs displacement movement along the up and down directions under the driving force from the press power unit 4. When the pressing power unit 4 is started, within a certain period of time, the lower mold plate 23 performs displacement movement towards the middle mold base 22 under the action of the driving force until the lower port of the blanking cavity 251 is blocked by the end face of the lower mounting seat 27. At the same time, the core rod 26 extends into the blanking cavity 251, and the cavity 252 for molding the ceramic splitting knife blank is formed incidentally. After the cavity 252 is filled with ceramic powder, the upper mold plate 21 performs displacement movement towards the middle mold base 22 under the action of the driving force, and the punch rod 28 is able to approach the female mold 25 and slowly enter the blanking cavity 251. The ceramic powder is pressed and formed into a ceramic splitting knife blank matching the shape of the cavity 252. With such a design, while ensuring that the ceramic splitting knife blank has good molding quality, the pressing mold 2 has a very simple design structure, which is conducive to reducing the overall manufacturing cost, and better realizes the organic integration with the powder feeding part 3, laying a good foundation for the ceramic powder to more fully and uniformly fill the blanking cavity 251.

[0044] It is known that in actual industrial production, due to the limitations of the characteristics of ceramic powder itself, it is very easy to aggregate due to the absorption of moisture in the air, which will inevitably affect the smoothness and fluidity of the powder filling process into the material cavity 251. In serious cases, it may even block the material cavity 251. In view of this, as a further optimization of the above technical solution, during the stage of ceramic powder being discharged from the powder conveying hose 32 and being filled into the material cavity 251, the powder transfer bin 33 is kept isolated from the outside world. And corresponding technical means should be adopted to seal the powder storage hopper 31 (a variety of implementation plans have been disclosed in the prior art, and they can be selected and referenced according to actual conditions in the research and development design), that is, when the ceramic powder is filled in the powder storage hopper 31, the powder storage hopper 31 should be sealed in time to avoid the occurrence of water vapor intrusion.

[0045] like Figure 4 , 5 As shown in FIGS. 6, 7 and 9, the pressing mold 2 is also provided with a sweeping plate 210. The sweeping plate 210 is in contact with the top wall of the middle mold base 22 and fixed as a whole. When the female mold 25 passes through the sweeping plate 210 and is inserted into the middle mold base 22, it does not go beyond the sweeping plate 210 (preferably 0.2 to 0.3 mm below the top surface of the sweeping plate 210). During the stage of ceramic powder being discharged from the powder conveying hose 32 and filling the discharge cavity 251, the powder transfer bin 33 and the top wall of the sweeping plate 210 are maintained in a close contact state. In this way, only one additional sweeping plate 210 is needed to ensure that the powder transfer bin 33 has a sufficient preset sweeping area, which is conducive to achieving the design purpose of high-quality feeding, and in the machining stage, only the top wall of the sweeping plate 210 needs to be finely ground, while the conventional overall fine grinding scheme of the center mold base 22 is abandoned, thereby reducing the molding difficulty and manufacturing cost of the pressing mold 2 to a certain extent.

[0046] The powder transfer bin 33 is preferably a split design structure, which includes a bin body and an elastic material resistance ring. The elastic material resistance ring is lined and fixed to the bottom end surface of the bin body, and in the process of ceramic powder dropping, it is axially compressed and deformed due to the joint extrusion force from the bin body and the sweeping plate 210. Depending on the specific application scenario, the elastic material resistance ring can be selected from wool felt rings, wear-resistant rubber rings, etc. In the process of powder feeding and powder dropping to the dropping cavity 251, the elastic material resistance ring is elastically deformed due to the axial extrusion force, and is pressed against the sweeping plate 210 with extremely high surface accuracy, thereby effectively preventing moisture and external impurities from entering the powder transfer bin 33 and the dropping cavity 251.

[0047] As is known, according to design common sense, the material shaking drive unit 34 can adopt a variety of design structures to achieve the driving of the powder transfer bin 33 for high-frequency reciprocating sweeping motion. However, a design structure is relatively simple, easy to manufacture and implement, and convenient for performing subsequent maintenance operations. Specifically, as follows: Fig.10 As shown in , the material shaking drive unit 34 is mainly composed of several parts such as a slide cylinder 341 and a connecting transition component 342. Among them, the slide cylinder 341 is in contact with the top wall of the middle mold base 22, and is fixed as a whole in a detachable manner. The connecting transition component 342 directly loads the powder transfer bin 33, and alternately performs large-distance displacement and micro-high-frequency reciprocating displacement under the driving action of the slide cylinder 341. In the process of ceramic powder feeding, in the large-distance displacement stage, the slide cylinder 341 is started, and its slide extends forward for a large distance, and the powder transfer bin 33 is translated along the top wall of the sweeping plate 210 until it is shifted from the initial position to the blanking position; in the micro-high-frequency reciprocating displacement stage, the slide cylinder 341 receives a control signal to drive the slide to perform high-frequency small-distance reciprocating displacement motion, and the powder transfer bin 33 is able to perform reciprocating sweeping motion around the blanking cavity 251 until the blanking cavity 251 is filled with ceramic powder.

[0048] As a further optimization of the above technical solution, Fig.12 As shown in the figure, the connecting transition assembly 342 is mainly composed of a cantilever plate 3421, a mounting base plate 3422, a fastening assembly 3423, a bolt 3424 and a columnar spring 3425. Among them, the cantilever plate 3421 is directly driven by the slide cylinder 341, and is fixed to the mounting base plate 3422 as a whole by means of the fastening assembly 3423. The mounting base plate 3422 serves as the mounting base for the powder transfer bin 33. The powder transfer bin 33 is assembled with the mounting base plate 3422 by means of bolts 3424 and columnar springs 3425. When the ceramic powder is continuously charged into the blanking cavity 251, the powder transfer bin 33 is continuously subjected to the elastic restoring force from the four groups of columnar springs 3425. The mounting base plate 3422 and the bin body are respectively provided with mounting through holes and threaded holes that are compatible with the bolts 3424. During the operation of the material shaking drive unit 34, the powder transfer bin 33 approaches the sweeping plate 210 due to the elastic restoring force from multiple groups of columnar springs 3425. At the same time, the elastic material blocking ring undergoes elastic deformation due to the extrusion force, thereby effectively preventing the ceramic powder from overflowing through the gap.

[0049] It is known that according to design common sense, the compression deformation rate of the elastic material blocking ring itself has a crucial influence on the sealing performance and driving power of the powder transfer bin 33. In view of this, as a further optimization of the above technical solution, Fig.12As shown in FIG. 3 , the connection transition assembly 342 is additionally provided with a limit screw 3426. The limit screw 3426 is used to limit the maximum value of the distance d1 between the powder transfer bin 33 and the sweeping plate 210 (eg Fig.12 ), which uses the mounting base plate 3422 as the insertion basis. In actual application, when it is necessary to increase the compression deformation rate of the elastic material blocking ring, the worker only needs to rotate the limit screw 3426 in the positive direction, and the bin body is further close to the sweeping plate 210 due to the balancing force from the limit screw 3426; and when it is necessary to reduce the compression deformation rate of the elastic material blocking ring, the worker needs to rotate the limit screw 3426 in the reverse direction to release the restriction on the upward displacement freedom of the bin body, and the elastic potential energy stored in the multiple groups of columnar springs 3425 can be released. At the same time, the bin body is subjected to the pulling force from the multiple groups of bolts 3424 and performs an upward displacement movement, thereby gradually moving away from the sweeping plate 210.

[0050] like Figure 5 As shown in , according to different installation positions, the guide unit 24 is divided into an upper guide subunit 241 used in conjunction with the upper template 21 and a lower guide subunit 242 used in conjunction with the lower template 23. The upper guide subunit 241 is composed of a plurality of slide rail slider assemblies. The lower guide subunit 242 is composed of a plurality of guide column and guide sleeve assemblies. When the press power unit 4 is started, under the coordinated action of the plurality of slide rail slider assemblies, the upper template 21 is able to perform displacement movement in a directional manner toward / opposite to the middle mold base 22, thereby ensuring that the die punch rod 28 is accurately inserted into the blanking cavity 251.

[0051] like Figure 5 , 6 As shown in FIG. 1 , the profiling power unit 4 includes an upper profiling power subunit 41 and a lower profiling power subunit 42 , which are respectively used to drive the upper mold plate 21 and the lower mold plate 23 to perform displacement movement toward / backward of the middle mold base 22 in a one-to-one correspondence.

[0052] It is known that according to the quality inspection and acceptance specifications, the inner hole of the ceramic splitter has a very high centering requirement (less than 1μm), which indirectly requires the wire-threading hole of the ceramic splitter blank to also have a relatively high centering. In addition, the core rod 26 used as the wire-threading hole mold has a very large aspect ratio and is very easy to tilt, which will inevitably lead to the centering of the formed wire-threading hole out of tolerance, causing great difficulties for subsequent processing, and when the problem is serious, scrapping may also occur. In view of this, as a further optimization of the above technical solution, such as Figure 6 , 8The main body of the upper pressure-type power sub-unit 41 shown in the figure is the upper cylinder 411. The piston rod of the upper cylinder 411 is directly connected to the upper mounting seat 29. The lower pressure-type power sub-unit 42 is mainly composed of the lower cylinder 421, the connecting transition seat 422, the floating self-aligning sleeve 423 and the self-aligning power unit 424. The connecting transition seat 422 is detachably fixed to the bottom wall of the lower template 23, and is provided with a mounting cavity for loading the floating self-aligning sleeve 423. The floating self-aligning sleeve 423 serves as a connecting transition between the connecting transition seat 422 and the piston rod of the lower cylinder 421. It is installed in the mounting cavity and can freely perform circumferential rotation when subjected to the rotational torque from the self-aligning power unit 424. During the dry pressing stage, workers need to use a microscope to regularly check the centering of the core rod 26 in the cavity 252. If the value is out of tolerance, the floating alignment sleeve 423 needs to be rotated circumferentially at a small angle. During this process, the review work is repeated until the centering meets the design standards.

[0053] like Figure 6 , 8 As shown in FIG, the piston rod of the lower cylinder 421 is fixed to the floating self-aligning sleeve 423 by means of a locking nut 425. Fig.13 As shown in , the centering power unit 424 includes a servo motor 4241 and a synchronous belt transmission mechanism 4242. The servo motor 4241 is installed on one side of the lower cylinder 421, and outputs a rotational torque through the synchronous belt transmission mechanism 4242, so that the piston rod of the lower cylinder 421 and the floating centering sleeve 423 can synchronously perform a small-angle circumferential rotation motion. By adopting the above technical solution, in actual application, the automatic and precise adjustment of the core rod 26 can be easily achieved. The specific method is: with the help of a high-speed CCD to achieve real-time imaging of the outer edge of the core rod 26 and the edge of the cavity 252, and feedback to the data terminal, after image processing and analysis, it can be determined whether the centering exceeds the standard. When the value exceeds the standard, the data terminal sends a control signal to the servo motor 4241, and the floating centering sleeve 423 is slightly moved at a small angle due to the rotational torque, and the centering of the core rod 26 is checked again with the help of a high-speed CCD. The above process is repeated until the centering degree of the core rod 26 meets the design standard.

[0054] The removal mechanism 5 is mainly used to remove the formed ceramic splitting knife blank from the pressing mold 2 and transfer it. Fig.14 , 15As shown, the pick-up mechanism 5 is mainly composed of several parts such as the first cylinder 51, the support seat 52, the bearing base 53 and the elastic clamp 54. Among them, the support seat 52 is fixed on the top wall of the middle mold base 22. The first cylinder 51 uses the support seat 52 as an assembly base. The bearing base 53 is also fixed on the top wall of the middle mold base 22 and serves as an assembly base for the elastic clamp 54. In the process of holding the ceramic splitting knife blank, the elastic clamp 54 performs a yaw motion due to the push force from the first cylinder 51. At the same time, the first cylinder 51 performs a yaw motion adaptively due to the reverse force, so that the elastic clamp 54 can approach and elastically clamp the ceramic splitting knife blank. The elastic clamp 54 is composed of several parts such as the load-bearing sheet metal 541, the second cylinder 542, the first plate-shaped elastic finger 543 and the second plate-shaped elastic finger 544. The load-bearing sheet metal 541 is assembled on the bearing base 53, and performs a yaw motion due to the push force from the first cylinder 51. The first plate-like elastic finger 543 and the second plate-like elastic finger 544 are respectively detachably mounted on both sides of the load-bearing sheet metal 541, and are opposite to each other along the width direction of the load-bearing sheet metal 541. The second cylinder 542 uses the load-bearing sheet metal 541 as an installation base and penetrates the load-bearing sheet metal 541. During the process of the piston rod of the second cylinder 542 performing the backward / forward movement, the gap value d2 formed between the first plate-like elastic finger 543 and the second plate-like elastic finger 544 is synchronously reduced / expanded, thereby achieving / releasing the elastic clamping of the ceramic splitting knife blank. In this way, on the one hand, stable and reliable clamping of the ceramic splitting knife blank is achieved; on the other hand, because the first plate-like elastic finger 543 and the second plate-like elastic finger 544 cooperate to complete the clamping action, it means that the clamping force can be adaptively adjusted according to the outer diameter of the clamped ceramic splitting knife blank, thereby effectively avoiding the occurrence of excessive indentation or damage on the surface of the ceramic splitting knife blank due to unreasonable clamping force.

[0055] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest range of convergences with the principles and novel features disclosed herein.

Claims

1. A dry pressing device for ceramic splitting knife blanks, comprising a machine, a pressing mold, a powder feeding unit, a pressing power unit and a pickup mechanism; the pressing mold is supported by the machine, and ceramic powder is supplied to it via the powder feeding unit; the pressing power unit is matched with the pressing mold; when the ceramic powder is filled into the pressing mold, the pressing power unit applies pressure to make it into a ceramic splitting knife blank, and then it is transferred to the next process via the pickup mechanism, characterized in that The powder delivery part includes a powder storage hopper, a powder delivery hose, a powder transfer bin and a material shaking drive unit; the powder storage hopper is connected with the powder transfer bin by means of the powder delivery hose, and the ceramic powder can enter the powder transfer bin under the action of gravity; the material shaking drive unit is used as a power source for the powder transfer bin, and its action process includes a large-distance displacement stage and a micro-high-frequency reciprocating displacement stage; in the large-distance displacement stage, the powder transfer bin is displaced from the initial position to the blanking position until it is aligned with the blanking cavity of the pressing mold; in the micro-high-frequency reciprocating displacement stage, the powder transfer bin performs a micro-high-frequency reciprocating displacement motion due to the reciprocating force, and in this process, the blanking cavity is continuously filled with the blanking ceramic powder; The press mold comprises an upper template, a middle mold base, a lower template, a guide unit, a female mold, a core rod, a lower mounting seat, a punch rod and an upper mounting seat; the female mold is inserted into the middle mold base, and the blanking cavity is formed therein; the upper template and the lower template are respectively arranged at the upper and lower sides of the middle mold base, and with the assistance of the guide unit, both perform directional displacement movement toward / backwards from the middle mold base; the core rod uses the lower mounting seat as an insertion basis, and is generally supported by the lower template; the punch rod uses the upper mounting seat as an insertion basis, and is generally supported by the upper template, and is also supported by the pressure from the press mold. The driving force of the power unit performs displacement movement in the up-down direction; when the profiling power unit is started, the lower template performs displacement movement toward the middle mold base under the driving force in a certain period of time until the lower port of the blanking cavity is blocked by the lower mounting seat, and at the same time, the core rod extends into the blanking cavity, and the cavity is formed incidentally; in another period of time, the upper template performs displacement movement toward the middle mold base under the driving force, and the punch rod approaches the female mold and slowly enters the blanking cavity, and the ceramic powder is pressed to be formed into a ceramic splitting knife blank matching the shape of the cavity; The press mold further comprises a sweeping plate; the sweeping plate is in contact with the top wall of the middle mold base and fixed as a whole; when the female mold passes through the sweeping plate and is inserted into the middle mold base, it does not go beyond the sweeping plate; during the stage of ceramic powder falling from the powder conveying hose and filling into the falling cavity, the powder transfer bin and the sweeping plate are maintained in a close contact state; The powder transfer bin includes a bin body and an elastic material blocking ring; the elastic material blocking ring is attached to and fixed to the bottom end surface of the bin body, and in the process of ceramic powder dropping, it is axially compressed and deformed due to the combined extrusion force from the bin body and the sweeping plate; The material shaking driving unit includes a linear motion element and a connecting transition component; the linear motion element is in contact with the top wall of the middle mold base and is fixed as a whole in a detachable manner; the connecting transition component directly loads the powder transfer bin, and under the driving action of the linear motion element, alternately performs large-distance displacement and micro-high-frequency reciprocating displacement; The connecting transition assembly includes a cantilever plate, a mounting base plate, a fastening assembly, a bolt and a columnar spring; the cantilever plate is directly driven by the linear motion element and is fixed to the mounting base plate as a whole by means of the fastening assembly; the mounting base plate serves as the mounting base of the powder transfer bin; the powder transfer bin is assembled with the mounting base plate by means of the bolts and the columnar spring; when the ceramic powder is continuously charged into the blanking cavity, the powder transfer bin is continuously subjected to the elastic restoring force from the plurality of columnar springs; mounting through holes and threaded holes matching the bolts are respectively provided on the mounting base plate and the powder transfer bin; The connecting transition assembly further comprises a limit screw; the limit screw is used to limit the maximum value of the distance d1 between the powder transfer bin and the sweeping plate, and the installation base plate is used as the insertion basis; The profiling power unit includes an upper profiling power sub-unit and a lower profiling power sub-unit, which are respectively used to drive the upper mold plate and the lower mold plate to perform displacement movement toward / backwards from the middle mold base in a one-to-one correspondence; The upper press-type power sub-unit includes an upper cylinder; the piston rod of the upper cylinder is directly connected to the upper mounting seat; the lower press-type power sub-unit includes a lower cylinder, a connecting transition seat, a floating self-aligning sleeve and a self-aligning power unit; the connecting transition seat is detachably fixed to the bottom wall of the lower template, and is provided with a mounting cavity for loading the floating self-aligning sleeve; the floating self-aligning sleeve serves as a connecting transition between the connecting transition seat and the piston rod of the lower cylinder, is loaded into the mounting cavity, and can freely perform circumferential rotation when subjected to the rotational torque from the self-aligning power unit; The piston rod of the lower cylinder is fixed to the floating self-aligning sleeve by a locking nut; the self-aligning power unit includes a servo motor and a synchronous belt transmission mechanism; the servo motor is installed on one side of the lower cylinder, and outputs a rotational torque through the synchronous belt transmission mechanism, so that the piston rod of the lower cylinder and the floating self-aligning sleeve can synchronously perform a small-angle circumferential rotation motion; The picking mechanism includes a first cylinder, a support seat, a bearing base and an elastic clamp; the support seat is fixed on the top wall of the middle mold base; the first cylinder uses the support seat as an assembly base; the bearing base is also fixed on the top wall of the middle mold base and serves as an assembly base for the elastic clamp; in the process of holding the ceramic splitting knife blank, the elastic clamp performs a yaw motion due to the push force from the first cylinder, and at the same time, the first cylinder adaptively performs a yaw motion due to the reverse force, so that the elastic clamp is able to approach and elastically clamp the ceramic splitting knife blank; The elastic clamp includes a load-bearing sheet metal, a second cylinder, a first plate-like elastic finger and a second plate-like elastic finger; the load-bearing sheet metal is assembled on the supporting base and performs a yaw motion due to the pushing force from the first cylinder; the first plate-like elastic finger and the second plate-like elastic finger are respectively detachably mounted on both sides of the load-bearing sheet metal and are opposite to each other along the width direction of the load-bearing sheet metal; the second cylinder uses the load-bearing sheet metal as an installation base and penetrates the load-bearing sheet metal; in the process of the piston rod of the second cylinder performing a backward / forward movement, the gap value d2 formed between the first plate-like elastic finger and the second plate-like elastic finger is synchronously reduced / expanded, so as to realize / release the elastic clamping of the ceramic splitting knife blank.

2. The ceramic splitting knife blank dry pressing device according to claim 1, characterized in that: During the stage of ceramic powder dropping from the powder conveying hose and filling into the dropping cavity, the powder transfer bin is maintained in a mutually isolated state from the outside.

3. The ceramic splitting knife blank dry pressing device according to claim 1, characterized in that: According to different installation positions, the guide unit is divided into an upper guide subunit used in conjunction with the upper template and a lower guide subunit used in conjunction with the lower template; the upper guide subunit is composed of a plurality of slide rail and slider assemblies; the lower guide subunit is composed of a plurality of guide column and guide sleeve assemblies.

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