A rare earth permanent magnet powder pressing mold

Abstract

The present invention relates to a molding die, and specifically discloses a rare earth permanent magnet powder pressing molding die, which includes an upper mold assembly, a lower mold assembly and a filling mechanism, wherein the lower mold assembly includes a tray, a driving mechanism and a lower mold body; the tray is provided with a plurality of material withdrawal holes; the driving mechanism is connected to the tray in a transmission manner; the lower mold body is provided with molding holes of the same number as the material withdrawal holes, the lower mold body is rotatably fixed above the tray and a one-way transmission mechanism is provided between the tray and the lower mold body, the tray and the lower mold body rotate relative to each other, and the material withdrawal holes and the molding holes can be arranged in a positive or dislocated manner; a pressure head is provided in the upper mold assembly, and the filling mechanism is composed of a filling head and a feeding pipe. The pressing and demoulding of the blank are both performed by applying pressure by the upper mold assembly, and there is no need to separately set a push-out mechanism and a power device for demoulding, thereby simplifying the overall structure of the pressing equipment; the upper in and lower out mode of operation is adopted to avoid the contact between the blank and the magnetic powder, omit the surface cleaning of the blank, improve the processing efficiency and save the process cost.

Description

Technical Field

[0001] The invention relates to a forming die, in particular to a rare earth permanent magnet powder pressing forming die. Background Art

[0002] In the production process of rare earth permanent magnet products, a press molding device is usually used to press the rare earth permanent magnet powder into a shape. The mold design of the existing press molding device is not reasonable enough, and certain deficiencies are reflected in the molding process of rare earth permanent magnet products. For example, the patent with publication number CN113752360A discloses an improved rotary powder molding press. In this technical solution, both filling and material removal are carried out through the upper end of the die cavity. When filling, magnetic powder is easy to scatter around the die cavity, and impurities are easy to be introduced. When the blank is demolded from the upper end of the die cavity, the surface of the blank will absorb the magnetic powder scattered during filling. In order to avoid adverse effects on subsequent processes and the quality of the final product, it is usually necessary to use a brush or other tools to manually clean the magnetic powder attached to the surface of the blank. This process is not only time-consuming and labor-intensive, but also may affect the processing quality due to incomplete cleaning. When the equipment is working, the upper pressing rod needs to apply downward pressure to the magnetic powder in the mold cavity during the pressing stage, and the lower pressing rod needs to apply upward thrust to the blank during the material stripping stage. This requires a power device to be installed above and below the mold, which increases the complexity of the pressing equipment and significantly increases the operating energy consumption of the equipment. Summary of the invention

[0003] In order to overcome the shortcomings of the prior art, the present invention provides a rare earth permanent magnet powder pressing and forming mold with an ingenious and reasonable structural design and working principle. When the mold is working, filling is carried out at the upper end of the mold cavity, and demolding is carried out at the lower end of the mold cavity. The upper-in and lower-out method effectively avoids the adsorption of magnetic powder on the surface of the blank, saving the cleaning work of the surface of the blank; at the same time, the same set of upper mold components is used to apply pressure for pressing and demolding, so that the overall structure of the pressing equipment is simplified and the operating energy consumption of the pressing equipment is significantly reduced when working.

[0004] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0005] A rare earth permanent magnet powder compacting mold, comprising an upper mold assembly, a lower mold assembly and a filling mechanism, characterized in that: the lower mold assembly comprises a mounting frame, a bearing tray, a driving mechanism and a lower mold body; a vertical main shaft is fixed on the bearing tray, the bearing tray is fixed above the mounting frame through the rotation of the main shaft, and the bearing tray is provided with a plurality of material withdrawal holes distributed around the main shaft at equal angles; the driving mechanism is transmission-connected with the bearing tray; the lower mold body is provided with an axial hole and a number of forming holes equal to the number of the material withdrawal holes, the lower mold body is located above the bearing tray and the axial hole is rotationally matched with the main shaft; a one-way transmission mechanism is provided between the bearing tray and the lower mold body, the bearing tray and the lower mold body rotate relative to each other, so that the material withdrawal hole and the forming hole are arranged oppositely or offset; when the material withdrawal hole and the forming hole are arranged oppositely, the bearing tray does not block the lower end of the forming hole, and when the material withdrawal hole and the forming hole are offset, the lower end of the forming hole is blocked by the bearing tray to form a mold cavity;

[0006] The upper die assembly comprises a mounting seat, on which are fixed downwardly extending pressing rods having the same number as the forming holes, and a pressing head matching the forming holes is fixed at the lower end of the pressing rods;

[0007] The filling mechanism includes a filling head and a feed pipe connected to the filling head. The lower end of the filling head is slidably matched with the upper end of the lower mold body. When the lower mold body rotates, the filling head can cover the upper port of each molding hole in turn and connect the feed pipe with the molding hole; when the filling head is located between two adjacent molding holes, the filling head will not block the upper port of the molding hole, and at this time the filling head is blocked by the upper end face of the lower mold body.

[0008] In a preferred embodiment, the bearing tray is in the shape of a disc, the main shaft is fixed at the center of the bearing tray, and teeth are provided on the peripheral wall of the bearing tray; the driving mechanism is composed of a worm and a motor device for driving the worm to rotate, the worm is rotatably fixed on the mounting frame, and the teeth of the worm and the bearing tray are meshed so that the worm and the bearing tray form a worm and worm gear mechanism.

[0009] In a preferred embodiment, the one-way transmission mechanism includes a ratchet and a pawl, the ratchet is evenly distributed on the side wall of the upper end of the main shaft, and a plurality of pawls are provided. The pawls are rotatably fixed around the axial hole of the lower mold body, and the pawls are driven by an elastic member to maintain a mating state with the ratchet.

[0010] In a preferred embodiment, bolt holes are provided on both the mounting frame and the placement seat.

[0011] In a preferred embodiment, the upper end surface of the lower mold body is provided with a concave annular groove, the upper ports of the forming holes are all located in the annular groove, the lower end of the filling head is located in the annular groove, and the lower end surface of the filling head is slidably matched with the bottom of the annular groove.

[0012] In a preferred embodiment, a circle of grooves is provided on the side wall of the pressure head, and an adsorption ring made of a porous flexible material is sleeved in the groove; a liquid inlet joint is provided at the upper end of the pressure rod, and the liquid inlet joint is connected to a delivery pump via a conduit, and a flow channel is provided inside the pressure rod and the pressure head to connect the liquid inlet joint with the groove;

[0013] Furthermore, the delivery pump includes a cylindrical pump barrel, which is fixed on a mounting seat; the upper end of the pump barrel is communicated with the outside world, and a center hole is opened at the lower end; a piston and a push-down spring driving the piston to move downward are arranged in the pump barrel, and a liquid inlet interface and a liquid discharge interface communicating with its inner cavity are fixed at the lower end of the pump barrel; a liquid inlet check valve that only allows fluid to flow into the pump barrel is installed on the liquid inlet interface, the liquid inlet interface is used to be connected to a container containing a release agent, and a liquid discharge check valve that only allows fluid to flow from the inside of the pump barrel to the outside is installed on the liquid discharge interface, and the liquid discharge interface is connected to the liquid inlet joint via the conduit; a piston rod extending downward is fixed on the piston, the piston rod passes through the center hole and the two are slidably sealed; during the downward movement of the upper mold assembly, the piston rod can abut against the lower mold body.

[0014] Compared with the prior art, the rare earth permanent magnet powder compacting mold in the present invention has the following beneficial technical effects:

[0015] 1. When the green body is pressed and demolded, the upper mold assembly applies pressure to the green body, so there is no need to set up a push mechanism and a power device separately for demolding, which greatly simplifies the overall structure of the press equipment. At the same time, the energy consumption of the press equipment is avoided due to the optimization of the stroke, thereby reducing the production cost.

[0016] 2. Since the filling and demoulding are respectively operated based on the upper and lower ports of the forming hole, the contact between the blank and the scattered magnetic powder during filling is effectively avoided through the upper-in and lower-out method, thereby omitting the surface cleaning of the blank, improving the processing efficiency and saving the process cost.

[0017] 3. The forming hole is filled with a filling head, and the magnetic powder is not easy to scatter outside the forming hole, which can reduce the waste of raw materials and avoid the introduction of impurities in the pressing process. When the forming hole and the filling head move relative to each other, the magnetic powder can be scraped flat, so there is no need to set up a scraping device separately, which further simplifies the structure of the pressing equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present invention, but are not intended to limit the present invention.

[0019] Figure 1 This is a schematic diagram of the structure of the lower mold assembly in Example 1.

[0020] Figure 2 It is a schematic diagram of the structure of the lower mold assembly in Example 1 in another direction.

[0021] Figure 3 This is a schematic diagram of the parts breakdown of the lower mold assembly in Example 1.

[0022] Figure 4 Schematic diagram of the structure of the lower mold body in Example 1.

[0023] Figure 5 Schematic diagram of the matching structure between the lower mold body and the supporting tray in Example 1.

[0024] Figure 6 This is a schematic structural diagram of the upper mold assembly in Example 1.

[0025] Figure 7 It is a schematic diagram of the coordination state of the upper mold assembly, the lower mold assembly and the filling mechanism in Example 1 during filling.

[0026] Figure 8 Schematic diagram of the coordination state of the upper mold assembly, the lower mold assembly and the filler mechanism during molding in Example 1.

[0027] Fig. 9 Schematic diagram of the coordination state of the upper mold assembly, the lower mold assembly and the filler mechanism during demoulding in Example 1.

[0028] Fig.10 This is a schematic diagram of the structure of the upper mold assembly after partial sectioning in Example 2.

[0029] Fig.11 This is a schematic diagram of the structure of the delivery pump in Example 2.

[0030] Fig.12 This is a schematic diagram of the working state of the delivery pump when the upper mold assembly moves downward in Example 2.

[0031] Fig.13 This is a schematic diagram of the working state of the delivery pump when the upper mold assembly moves upward in Example 2.

[0032] In the figure: 1, mounting frame, 2, bearing tray, 3, lower mold body, 4, annular groove, 5, shaft cover, 6, forming hole, 7, feed pipe, 8, motor device, 9, stuffing head, 10, worm, 11, main shaft, 12, shaft seat, 13, withdrawal hole, 14, ratchet, 15, shaft hole, 16, pawl, 17, elastic member, 18, pressure head, 19, pressure rod, 20, mounting seat, 21, adsorption ring, 22, liquid inlet joint, 23, liquid inlet interface, 24, liquid inlet check valve, 25, pump barrel, 26, conduit, 27, discharge check valve, 28, discharge interface, 29, piston rod, 30, threaded section, 31, screw sleeve, 32, top head, 33, groove, 34, flow channel, 35, piston, 36, push-down spring, 37, center hole. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Example 1

[0035] See also Figure 1-Figure 9 As shown, this embodiment discloses a specific structure of a rare earth permanent magnet powder compacting die, which is composed of an upper die assembly, a lower die assembly and a filling mechanism.

[0036] Among them, the lower mold assembly includes a mounting frame 1, a support tray 2, a driving mechanism and a lower mold body 3; the mounting frame 1 is used to be installed and fixed on the press equipment to provide support for the lower mold assembly; a vertically extending main shaft 11 is fixed on the support tray 2, and the upper and lower ends of the main shaft 11 are respectively located above and below the support tray 2; the support tray 2 is provided with a plurality of material withdrawal holes 13 in the up and down directions, and these material withdrawal holes 13 are located around the main shaft 11 and are distributed at equal angles; the support tray 2 is rotatably fixed above the mounting frame 1 through the main shaft 11, specifically, the mounting frame 1 is provided with a shaft seat 12 that is rotatably matched with the main shaft 11, and the main shaft 11 and the shaft seat 12 cannot move relative to each other in the axial direction; the driving mechanism is supported by the mounting frame 1, and the driving mechanism is transmission-connected with the support tray 2 to drive the support tray 2 to rotate, and can adjust the rotation direction and rotation angle of the support tray 2; the lower mold body 3 is provided with an axial hole 15 and a plurality of forming holes 6 in the up and down directions, and the forming holes 6 and the material withdrawal holes 13 are The number is equal; the lower mold body 3 is located above the support tray 2 and the shaft hole 15 is rotatably matched with the main shaft 11, so that the lower mold body 3 is supported by the support tray 2 and the two can rotate relative to each other; a one-way transmission mechanism is arranged between the support tray 2 and the lower mold body 3. As the name implies, the one-way transmission mechanism has the characteristics of one-way transmission. When the support tray 2 rotates in one direction, the one-way transmission mechanism allows the support tray 2 and the lower mold body 3 to rotate relative to each other, and when the support tray 2 rotates in the other direction, the support tray 2 is driven by the one-way transmission mechanism to rotate relative to the lower mold body 3. The mold body 3 rotates synchronously; when the supporting tray 2 and the lower mold body 3 rotate relative to each other, the material return hole 13 and the forming hole 6 can be arranged opposite each other, or offset; when the material return hole 13 and the forming hole 6 are arranged opposite each other, the material return hole 13 is located directly below the corresponding forming hole 6, and the supporting tray 2 does not block the lower end of the forming hole 6. When the material return hole 13 and the forming hole 6 are offset, the lower end of the forming hole 6 is located between two adjacent material return holes 13, so that the lower end of the forming hole 6 is blocked by the supporting tray 2 to form a mold cavity.

[0037] Among them, the upper mold assembly includes a mounting seat 20, which is used to be installed and fixed on the press equipment to provide support for the upper mold assembly; a number of downwardly extending pressure rods 19 are fixed on the mounting seat 20, and the number of the pressure rods 19 is equal to the number of forming holes 6, and the lower end of the pressure rod 19 is fixed with a pressure head 18 that matches the forming holes 6 one by one.

[0038] Among them, the filling mechanism includes a filling head 9 and a feed pipe 7 connected to the filling head 9, the filling mechanism is supported and fixed by the mounting frame 1, and the lower end of the filling head 9 is slidably matched with the upper end of the lower mold body 3; when the lower mold body 3 rotates, the filling head 9 can cover the upper port of each molding hole 6 in turn, and connect the feed pipe 7 with the molding hole 6; when the filling head 9 is located between two adjacent molding holes 6, the filling head 9 will not block the upper port of the molding hole 6, and the filling head 9 is blocked by the upper end surface of the lower mold body 3.

[0039] When the rare earth permanent magnet powder compacting mold is used, the lower mold assembly and the filler mechanism are installed and fixed on the pressing device via the mounting frame 1, and the upper mold assembly is fixed on the pressing device via the mounting seat 20. The upper mold assembly is located above the lower mold assembly, and the upper mold assembly is driven by a power device to move up and down, and the feed pipe 7 is connected to the feeding system; when the pressing device is in the initial state, the upper mold assembly is located at the upper end of its stroke without hindering the rotation of the lower mold body 3, and the withdrawal hole 13 is staggered with the forming hole 6. At this time, the lower end of the forming hole 6 is in a closed state to form a mold cavity.

[0040] When the magnetic powder is pressed and formed, the specific working principles and steps are as follows:

[0041] First, if Figure 7 As shown, in the initial state, the driving mechanism is used to drive the tray 2 to rotate in one direction, and the tray 2 drives the lower mold body 3 to rotate synchronously through the one-way transmission mechanism, and a forming hole 6 is adjusted to the bottom of the filling head 9. The magnetic powder enters the forming hole 6, that is, the mold cavity, through the feeding pipe 7 and the filling head 9. After the forming hole 6 is filled with the magnetic powder, the lower mold body 3 is continued to be driven to rotate, and the filling head 9 scrapes the magnetic powder in the forming hole 6. Each forming hole 6 can be filled and scraped in turn in the above manner, or, during the filling process, the lower mold body 3 is continuously rotated so that each forming hole 6 is cyclically matched with the filling head 9, so that the magnetic powder gradually fills each forming hole 6 and finally completes the scraping. This filling method is conducive to improving the uniformity of the magnetic powder distribution in the forming hole 6 and is conducive to improving the orientation effect; after completing the filling, the lower mold body 3 is continued to be driven to rotate so that the forming hole 6 is located directly below the corresponding pressure head 18. At this time, the filling head 9 is located between two adjacent forming holes 6 to ensure that the filling mechanism does not hinder the downward movement of the lower mold assembly;

[0042] Then, if Figure 8 As shown, the upper die assembly moves downward, and the pressing head 18 enters the corresponding forming hole 6 to press the magnetic powder in the forming hole 6 to form a blank;

[0043] Finally, if Fig. 9 As shown, the driving mechanism drives the tray 2 to rotate in the other direction. Since the lower mold body 3 and the ram 18 are in a mating state and cannot rotate, the tray 2 will rotate alone at this time, so that the withdrawal hole 13 and the forming hole 6 are adjusted from a staggered distribution to a facing distribution. Thereafter, the upper mold assembly continues to move downward, and the ram 18 drives the blank in the forming hole 6 to move downward, and finally passes through the withdrawal hole 13 and is discharged, thereby completing the demolding of the blank.

[0044] When the rare earth permanent magnet powder pressing and molding die is used to press and demold the blank, the upper mold assembly applies pressure to the blank, so there is no need to set up a push-out mechanism and a power device separately for demolding, which greatly simplifies the overall structure of the pressing equipment. At the same time, the energy waste of the pressing equipment is avoided due to the optimization of the stroke, thereby reducing the production cost; in addition, since the filling and demolding are respectively operated based on the upper port and the lower port of the forming hole, the blank is effectively avoided from contacting with the scattered magnetic powder during the filling by the upper in and lower out method, and the surface cleaning of the blank can be omitted, thereby improving the processing efficiency and saving the process cost.

[0045] The rare earth permanent magnet powder pressing and forming die fills the forming hole through a filling head, and the magnetic powder is not easy to scatter outside the forming hole, which can reduce the waste of raw materials and avoid the introduction of impurities in the pressing process. When the forming hole and the filling head move relative to each other, the magnetic powder can be scraped flat, so there is no need to set up a scraping device separately, so that the structure of the pressing equipment is further simplified.

[0046] The rare earth permanent magnet powder compacting die is suitable for the forming processing of columnar and pancake blanks. The cross-section of the forming hole and the pressing head can be circular, polygonal, rectangular or other geometric shapes according to the needs of the processed products.

[0047] Preferably, Figure 1-Figure 3 As shown, the tray 2 is disc-shaped, the main shaft 11 is fixed at the center of the tray 2, and teeth are provided on the peripheral wall of the tray 2; the driving mechanism is composed of a worm 10 and a motor device 8 for driving the worm 10 to rotate, the worm 10 is rotatably fixed on the mounting frame 1, and the teeth of the worm 10 and the tray 2 are meshed so that the worm 10 and the tray 2 form a worm and worm gear mechanism.

[0048] Preferably, Figure 1 , Figure 3 As shown, a shaft cover 5 covering the shaft hole 15 is provided above the lower mold body 3, and the shaft cover 5 is fixedly connected to the upper end of the main shaft 11; based on the setting of the shaft cover 5, on the one hand, it can provide good protection for the matching structure of the shaft hole 15 and the main shaft 11, and prevent foreign matter such as magnetic powder and dust from entering the matching gap between the shaft hole 15 and the main shaft 11; on the other hand, the shaft cover 5 can provide a limiting effect for the lower mold body 3, so that the matching between the lower mold body 3 and the supporting plate 2 is more stable.

[0049] In the rare earth permanent magnet powder compacting die, the one-way transmission mechanism can be implemented based on structures such as a ratchet transmission mechanism and a one-way transmission bearing; preferably, Figure 3-Figure 5 As shown, the one-way transmission mechanism includes a ratchet 14 and a pawl 16. The ratchet 14 is evenly distributed on the side wall of the upper end of the main shaft 11. There are multiple pawls 16. The pawls 16 are rotatably fixed around the axial hole 15 of the lower mold body 3. The pawls 16 are driven by an elastic member 17 and can maintain a mating state with the ratchet 14.

[0050] Preferably, the mounting frame and the placement seat are both provided with bolt holes to facilitate installation and fixation on the profiling equipment.

[0051] Preferably, Figure 1 , Figure 7 As shown, the upper end surface of the lower mold body 3 is provided with a concave annular groove 4, the upper end of the forming hole 6 is located in the annular groove 4, the lower end of the filling head 9 is located in the annular groove 4, and the lower end surface of the filling head 9 is slidably matched with the bottom of the annular groove 4. On the one hand, the above structure can improve the matching stability between the lower mold body 3 and the filling head 9, and on the other hand, even if magnetic powder is scattered outside the forming hole 6 during the filling process, these scattered magnetic powders are located in the annular groove 4 and will not spread around, and as the lower mold body 3 rotates, these scattered materials are pushed by the filling head 9 and will still enter the forming hole 6.

[0052] Example 2

[0053] In the compacting process of rare earth permanent magnet powder, the interaction between the mold and the powder material may lead to mold sticking problems, thus affecting the quality and production efficiency of the product. Combined with the actual production situation, the reasonable use of release agent is conducive to improving the demolding efficiency and surface quality of the product.

[0054] Based on the structure of the rare earth permanent magnet powder compacting mold disclosed in the previous embodiment, this embodiment has further improvements on the use mechanism of the release agent.

[0055] See also Fig.10 As shown, in the rare earth permanent magnet powder compacting mold, a circle of grooves 33 are provided on the side wall of the pressure head 18, and an adsorption ring 21 made of a porous flexible material is sleeved in the groove 33; a liquid inlet connector 22 is provided at the upper end of the pressure rod 19, and the liquid inlet connector 22 is connected to a delivery pump via a conduit 26, and a flow channel 34 is provided inside the pressure rod 19 and the pressure head 18 to connect the liquid inlet connector 22 with the groove 33.

[0056] Therefore, after the delivery pump is connected to the container containing the release agent, the delivery pump can be used to pump the release agent to the groove 33, and the adsorption ring 21 can adsorb the release agent in the groove 33; when the pressure head 18 moves in the forming hole 6, the adsorption ring 21 can evenly apply the release agent on the side wall of the forming hole 6 to achieve automatic application of the release agent. The adsorption ring 21 is made of porous flexible materials such as sponge and foam. On the one hand, it can make good contact with the side wall of the forming hole 6 to ensure the application effect. On the other hand, after the pressure head 18 is removed from the forming hole 6, the adsorption ring 21 can prevent the release agent from overflowing to the outside of the groove 33 based on its good adsorption performance, thereby reducing the waste of raw materials and avoiding environmental pollution.

[0057] Furthermore, when the upper mold assembly moves downward, the adsorption ring 21 can be located at the lower side of the forming hole 6; thereby, the adsorption ring 21 can apply the release agent to the mating surface between the lower mold body 3 and the support tray 2, and when the lower mold body 3 and the support tray 2 rotate relative to each other, the release agent can further adhere to the upper end surface of the support tray 2 to ensure that when demolding, when the withdrawal hole 13 and the forming hole 6 are adjusted from a staggered distribution to a facing distribution, the support tray 2 can more easily rotate relative to the blank.

[0058] In specific implementation, the delivery pump can be an electric pump and a corresponding control mechanism can be set, thereby automatically controlling the application timing and application amount of the release agent; this embodiment also provides another preferred implementation structure of the delivery pump, specifically:

[0059] See also Figure 10-13 As shown, the delivery pump includes a cylindrical pump barrel 25, which is fixed on the mounting seat 20; the upper end of the pump barrel 25 is communicated with the outside world, and a center hole 37 is opened at the lower end. A piston 35 and a push-down spring 36 for driving the piston 35 to move downward are arranged in the pump barrel 25, and a liquid inlet interface 23 and a liquid discharge interface 28 which are communicated with its inner cavity are fixed at the lower end of the pump barrel 25, and a liquid inlet check valve 24 which only allows the fluid to flow into the pump barrel 25 is arranged on the liquid inlet interface 23, and the liquid inlet interface 23 is used to be connected to a container containing a release agent, and a liquid discharge check valve 27 which only allows the fluid to flow outward from the inside of the pump barrel 25 is arranged on the liquid discharge interface 28, and the liquid discharge interface 28 is connected to the liquid inlet joint 22 via the conduit 26; a piston rod 29 extending downward is fixed on the piston 35, and the piston rod 29 passes through the center hole 37 and the two are slidably sealed; during the downward movement of the upper mold assembly, the piston rod 29 can abut against the lower mold body 3.

[0060] Therefore, if Fig.12 , Fig.13 As shown, during the pressing or material stripping process, when the upper mold assembly moves downward, after the piston rod 29 hits the lower mold body, the piston 35 will overcome the thrust of the push-down spring 36 and move upward relative to the pump barrel 25, and the release agent enters the pump barrel 25 through the liquid inlet interface 23 and the liquid inlet one-way valve 24 to complete the liquid absorption; when the upper mold assembly moves upward, that is, when the mold returns to its initial state, the piston rod 29 is no longer restricted by the lower mold body, and driven by the push-down spring 36, the piston 35 moves downward, driving the release agent to be discharged through the discharge one-way valve 27 and the discharge interface 28, thereby pumping the release agent into the liquid inlet joint 22.

[0061] Based on the above design, the delivery pump can automatically pump the release agent according to the up and down movement of the upper mold assembly without the aid of an additional power device; at the same time, since the delivery pump pumps the release agent when the mold returns to its initial state, it is in line with the use of the release agent in conjunction with the pressing equipment in actual production, and can ensure a good demolding effect.

[0062] Further, such as Figure 10-12 As shown, a threaded section 30 is provided at the lower part of the piston rod 29, and a threaded sleeve 31 is sleeved on the threaded section 30. A top head 32 is fixed to the lower end of the sleeve 31, and the piston rod 29 cooperates with the lower mold body 3 through the top head 32; thus, the upper and lower positions of the top head 32 can be adjusted by the sleeve 31, and the displacement of the piston 35 during the downward movement of the upper mold assembly can be adjusted, thereby realizing the regulation of the delivery amount, i.e., the usage amount of the release agent; specifically, when the position of the top head 32 is close to the bottom, the displacement of the piston 35 is larger when the upper mold assembly moves downward, and more release agent is delivered, otherwise it is less. When the position of the top head 32 is high enough, the top head 32 does not contact the lower mold body 3 when the upper mold assembly moves downward, and the piston 35 does not produce any displacement, i.e., the release agent is in an inactive state.

[0063] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

[0064] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

Claims

1. A rare earth permanent magnet powder compacting die, comprising an upper die assembly, a lower die assembly and a filling mechanism, characterized in that: The lower mold assembly includes a mounting frame, a bearing tray, a driving mechanism and a lower mold body; a vertical spindle is fixed on the bearing tray, the bearing tray is fixed above the mounting frame through the rotation of the spindle, and the bearing tray is provided with a number of material withdrawal holes distributed around the spindle at equal angles; the driving mechanism is transmission-connected with the bearing tray; the lower mold body is provided with an axial hole and a number of forming holes equal to the number of material withdrawal holes, the lower mold body is located above the bearing tray, and the axial hole is rotationally matched with the spindle; a one-way transmission mechanism is provided between the bearing tray and the lower mold body, and the bearing tray is connected to the lower mold body The rotation can make the material withdrawal hole and the forming hole face each other or be staggered; when the material withdrawal hole and the forming hole face each other, the support tray does not block the lower end of the forming hole; when the material withdrawal hole and the forming hole are staggered, the lower end of the forming hole is blocked by the support tray to form a mold cavity; the one-way transmission mechanism includes ratchets and pawls, the ratchets are evenly distributed on the side wall of the upper end of the main shaft, and the pawls are provided in plurality. The pawls are rotatably fixed around the shaft hole of the lower mold body, and the pawls are driven by an elastic member to maintain a matching state with the ratchets; The upper die assembly comprises a mounting seat, on which are fixed downwardly extending pressing rods having the same number as the forming holes, and a pressing head matching the forming holes is fixed at the lower end of the pressing rods; The filling mechanism includes a filling head and a feed pipe connected to the filling head. The lower end of the filling head is slidably matched with the upper end of the lower mold body. When the lower mold body rotates, the filling head can cover the upper port of each molding hole in turn and connect the feed pipe with the molding hole; when the filling head is located between two adjacent molding holes, the filling head will not block the upper port of the molding hole, and at this time the filling head is blocked by the upper end face of the lower mold body.

2. The rare earth permanent magnet powder compacting die according to claim 1, characterized in that: The bearing tray is in the shape of a disc, the main shaft is fixed at the center of the bearing tray, and teeth are provided on the peripheral wall of the bearing tray; the driving mechanism is composed of a worm and a motor device for driving the worm to rotate, the worm is rotatably fixed on the mounting frame, and the teeth of the worm and the bearing tray are meshed so that the worm and the bearing tray form a worm and worm gear mechanism.

3. The rare earth permanent magnet powder compacting die according to claim 1, characterized in that: The mounting frame and the placement seat are both provided with bolt holes.

4. The rare earth permanent magnet powder compacting die according to claim 1, characterized in that: The upper end surface of the lower mold body is provided with a concave annular groove, the upper ports of the forming holes are all located in the annular groove, the lower end of the filling head is located in the annular groove, and the lower end surface of the filling head is slidably matched with the bottom of the annular groove.

5. The rare earth permanent magnet powder compacting die according to claim 1, characterized in that: During the filling process, the lower mold body is continuously rotated so that each forming hole cooperates with the filling head cyclically, thereby allowing the magnetic powder to gradually fill each forming hole and finally complete the scraping.

6. The rare earth permanent magnet powder compacting die according to claim 1, characterized in that: A circle of grooves is provided on the side wall of the pressure head, and an adsorption ring made of porous flexible material is sleeved in the groove; a liquid inlet joint is provided at the upper end of the pressure rod, and the liquid inlet joint is connected to a delivery pump via a conduit; a flow channel is provided inside the pressure rod and the pressure head to connect the liquid inlet joint with the groove.

7. The rare earth permanent magnet powder compacting die according to claim 6, characterized in that: When the upper mold assembly moves downward, the adsorption ring can be located at the lower side of the forming hole.

8. The rare earth permanent magnet powder compacting die according to claim 6, characterized in that: The delivery pump includes a cylindrical pump barrel, which is fixed on a mounting seat; the upper end of the pump barrel is communicated with the outside, and a center hole is opened at the lower end; a piston and a push-down spring driving the piston to move downward are arranged in the pump barrel, and a liquid inlet interface and a liquid discharge interface which are communicated with its inner cavity are fixed at the lower end of the pump barrel; a liquid inlet check valve which only allows fluid to flow into the pump barrel is installed on the liquid inlet interface, and the liquid inlet interface is used to be connected to a container containing a release agent, and a liquid discharge check valve which only allows fluid to flow from the inside of the pump barrel to the outside is installed on the liquid discharge interface, and the liquid discharge interface is connected to the liquid inlet joint via the conduit; a piston rod extending downward is fixed on the piston, and the piston rod passes through the center hole and the two are slidably sealed; during the downward movement of the upper mold assembly, the piston rod can abut against the lower mold body.

9. The rare earth permanent magnet powder compacting die according to claim 8, characterized in that: A threaded section is arranged at the lower part of the piston rod, a threaded sleeve with threaded matching is sleeved on the threaded section, a top is fixed at the lower end of the threaded sleeve, and the piston rod is matched with the lower mold body through the top.

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