CN108145154B

CN108145154B - Automatic magnet forming system and method

Info

Publication number: CN108145154B
Application number: CN201611105350.XA
Authority: CN
Inventors: 侯德柱; 吴晓平; 王东明; 王进东; 叶选涨; 陈治安
Original assignee: TIANJIN SANHUAN LUCKY NEW MATERIAL Inc; Beijing Zhong Ke San Huan High Tech Co Ltd
Current assignee: TIANJIN SANHUAN LUCKY NEW MATERIAL Inc.; Beijing Zhong Ke San Huan High Tech Co Ltd
Priority date: 2016-12-05
Filing date: 2016-12-05
Publication date: 2021-08-10
Anticipated expiration: 2036-12-05
Also published as: CN113414387B; CN113414387A; CN108145154A

Abstract

The invention relates to an automatic magnet molding system and method. The forming system comprises a moving die, a moving die driving device, a base, a sliding rail, a left guide plate, a right guide plate, a magnet pushing device arranged on a station No. 1, a left baffle plate and a right baffle plate arranged on a station No. 2, a side baffle plate mould closing device and a mould unloading device, a feeding mechanism arranged on a station No. 3 and an upper pressure head orientation forming device arranged on a station No. 4, wherein the moving die comprises a bottom plate, a front baffle plate and a rear baffle plate, a forming area matched with the upper pressure head orientation forming device is arranged on the bottom plate, the sliding rail is fixedly arranged on the base, the left guide plate and the right guide plate are fixedly arranged on the base and are respectively arranged on the left side and the right side of the moving die and extend from the station No. 4 to the station No. 2; the movable mould is driven by the movable mould driving device to slide on the slide rail. The invention can ensure high-density orientation pressing and nondestructive demoulding of the magnet and improve the degree of automatic production.

Description

Automatic magnet forming system and method

Technical Field

The invention mainly relates to an automatic magnet molding system, in particular to an automatic magnet molding system and method, a sheet magnet molding die and a dismounting device.

Background

With the wide application of rare earth magnets, the market size and competition become larger and larger. How to adopt less rare earth to obtain high-performance magnets and obtain magnets with higher production efficiency and stable performance by less manual operation participation is widely concerned and tried in the industry. The press orientation molding from magnetic powder to a magnet is an essential key process in the production of the magnet. In the traditional production, the processes of disassembling and assembling the die, weighing magnetic powder, distributing the powder in the die before compression molding, taking out the magnet after orientation molding and the like are all completed manually. Because of the participation of manpower, the oxidation caused by the contact of magnetic powder and oxygen can not be effectively avoided in the procedure, more heavy rare earth has to be added during the production to ensure the performance of the magnet, and the production efficiency and the product consistency are also severely restricted.

In the prior art, a mode that a lower pressing head directly pushes out a pressed and molded magnet from the lower part of a mold is generally adopted. When the density of the pressed magnet is too high, the magnet is stuck with the mold and cannot be demolded even if the mold and the pressure head are sprayed with the demolding agent, and even if the demolding is possible, the magnet is easy to have internal hidden cracks and corner damage and the short service life of the mold during use are caused.

Of course, if hard alloy is used to make the die and the pressing head, the die hardness of the contact surface between the die and the magnetic powder can be enhanced to press the high-density magnet. However, the replacement of cemented carbide has the following disadvantages: on one hand, the material is hard and difficult to process, and the manufacturing cost of the die is far higher than that of common die steel. And the magnet is easy to crack during high-load pressing due to the high hardness of the hard alloy steel. More importantly, on the other hand, the problem of adhesion between the magnet and the mold is solved by replacing the mold material, but the problems of hidden crack and corner damage of the magnet when the magnet is demolded due to overlarge friction force between the magnet and the mold cannot be solved.

The manual combined die is adopted for pressing and molding the magnet, and the effect of removing the friction force between the die and the magnet piece can be achieved when the die is decomposed by theoretically analyzing. However, the goal of removing the magnet from the mold is still not ideal because it is not possible to manually disassemble the mold multiple sides at the same time. In addition, the manual combined die has large personnel occupancy rate, low production efficiency and poor product stability.

Also, if the density of the magnet is low, a post-manual sealing process of the magnet must be performed before sintering to further increase the density of the magnet. Due to the addition of the isostatic pressing process, not only does the process extend the possibility of the magnet being oxidized, but also about 3% of the magnet is lost to white due to oil bleed and is not recyclable. In addition, due to the existence of the isostatic pressing process, the magnet production orientation forming process and the magnet sintering process cannot be connected together, and the orientation forming and magnet sintering integrated automatic production cannot be realized. In order to break through the bottleneck and get rid of the situation, the industry starts to research the full-sealing automatic pressing orientation forming technology of the magnetic powder.

Therefore, aiming at the defects of the prior art, in order to achieve the aims of ensuring high-density orientation pressing and nondestructive demoulding of the magnet and improving the degree of automatic production at the same time under the atmosphere or under the oxygen-free or low-oxygen condition, a novel automatic orientation forming system and a novel automatic orientation forming method are provided.

Disclosure of Invention

Aiming at the problems, the invention provides an automatic magnet forming system and method, which can ensure high-density orientation pressing and nondestructive demoulding of a magnet and improve the automatic production degree. The invention also provides a sheet magnet forming die to form the sheet magnet. The invention also provides a dismounting device, so as to provide an automatic magnet dismounting device.

The invention provides an automatic magnet forming system which comprises a movable mould, a movable mould driving device, a base, a slide rail, a left guide plate, a right guide plate, a magnet push-out device arranged at a station No. 1, a left baffle plate, a right baffle plate, a side baffle plate mould closing device, a mould unloading device, a feeding mechanism arranged at a station No. 3 and an upper pressure head orientation forming device arranged at a station No. 4, wherein the movable mould comprises a bottom plate, a front baffle plate and a rear baffle plate, and a forming area matched with the upper pressure head orientation forming device is arranged between the front baffle plate and the rear baffle plate on the bottom plate; the No. 1 station, the No. 2 station, the No. 3 station and the No. 4 station are arranged in sequence; the sliding rail is fixedly arranged on the base and extends from the No. 1 station to the No. 4 station; the left guide plate and the right guide plate are fixedly arranged on the base, are respectively arranged on the left side and the right side of the movable die and extend from the No. 4 station to the No. 2 station; the movable mould is driven by the movable mould driving device to slide on the slide rail.

In the molding system, the magnet ejecting device arranged at the station No. 1 comprises the power driving mechanism and the ejector head connected with the power driving mechanism, and is used for ejecting the movable mold in the left and right directions of the movable mold.

In the molding system, the left guide plate and the right guide plate are respectively provided with openings at the station No. 2; the die closing device comprises die closing driving mechanisms arranged on two sides of the left guide plate and the right guide plate, and the die closing driving mechanisms are respectively connected with push plates at the openings and used for pushing the left side baffle and the right side baffle to the movable die to close the dies.

In the molding system, the left side and the right side of the rear baffle are respectively provided with a groove, the left side baffle and the right side baffle are respectively provided with a protrusion matched with the groove at the position corresponding to the groove, and the matching is used for matching the left side baffle and the right side baffle with the movable mold.

In the above molding system, the mold unloading device has the structure that: distance between left side deflector and the right deflector is in No. 2 station departments are greater than in other station departments, left side deflector and right deflector are in the orientation a backup pad is connected separately to the inboard bottom of removal mould, the upper surface of backup pad with the bottom plate of removal mould flushes, the backup pad respectively with the bottom plate separates certain clearance for when unloading left side baffle and right side baffle lean on because of the action of gravity outwards, the outer arris in bottom support in the backup pad, the outer arris in upper end lean on to one side on left side deflector or right deflector.

In the molding system, the movable mold is provided with the position sensor for detecting the position of the movable mold.

In the molding system, the feeding mechanism comprises a material box moving power mechanism, a material box flat plate scraping blade and a driving mechanism, and the feeding mechanism comprises the material box moving power mechanism, and the material box flat plate scraping blade and the driving mechanism are vertically arranged above the moving mold.

In the above molding system, the molding region of the bottom plate is a molding region of a cylindrical, sheet or block magnet.

In the molding system, the station 2 and the station 3 are combined into one station in position.

In the molding system, the system further comprises a front baffle dismounting device, and the front baffle dismounting device comprises a power driving device and a connecting device for connecting the front baffle with the power driving device.

The invention provides an automatic molding method using the system, which comprises the following steps: the magnet molded at station No. 1 is pushed out of the moving mold without the side dams; the movable mould is driven to a No. 2 station by a movable mould driving device, and the left and right side baffles are clamped so that the movable mould is matched with the left and right side baffles; the moving die after die assembly moves forward to a No. 3 station under the driving of a moving die driving device, and magnetic powder is loaded through a charging mechanism; the movable die filled with the magnetic powder moves forward to a No. 4 station under the driving of a movable die driving device to carry out magnetic field orientation molding; the moving die after the orientation forming is driven by a moving die driving device to move to a No. 2 station, and the baffles on the left side and the right side are separated from the moving die; the movable mould is driven by the movable mould driving device to move downwards to the No. 1 station, and the magnet is pushed out; the system enters the next cycle.

According to the forming method, when the mold is closed, under the condition that the left and right side baffles are clamped by the air cylinder, the movable mold drives the left and right side baffles to move forward for a certain distance under the driving of the movable mold driving device, and after the space between the left and right side baffles and the left and right guide plates is gradually reduced to be in close sliding fit, the air cylinder is loosened.

In the above molding method, the molding process is performed in an atmospheric environment or a sealed and vacuum-pumping environment.

The invention also provides a sheet magnet forming die, which comprises a stepped shaft, a front baffle, a rear baffle, a forming block and an upper pressure head, wherein the stepped shaft is provided with round shafts with shaft diameters arranged from small to large in sequence; the number of the forming blocks corresponds to the order number of the stepped shaft, an inner hole is formed in the center of each forming block, each forming block is installed in a manner of being matched with the outer circle of each stepped circular shaft of the stepped shaft through the inner hole, and an upper forming area of each forming block is formed into an L shape by two planes which are vertical to each other; after the forming blocks and the stepped shaft are installed, a U-shaped groove is formed in the upper forming area of each two forming blocks; the upper pressure head is provided with pressure heads with the same number as the U-shaped grooves of the forming area, each pressure head is a bulge correspondingly matched with each U-shaped groove and used for forming the sheet-shaped magnet in the U-shaped groove when the pressure heads are pressed down; and the outer sides of the forming blocks at the two ends of the stepped shaft are provided with the front baffle and the rear baffle.

Foretell mould, install the minimum end department in the diameter of axle of stepped shaft the preceding baffle, open at preceding baffle center has the through-hole, the minimum end of diameter of axle of stepped shaft outwards extends to have and passes the thread head of through-hole, install baffle and nut on the thread head, be used for locking the mould.

In the mold, the rear baffle is arranged at the maximum shaft diameter end of the stepped shaft, and the inner hole of the forming block on the circular shaft at the maximum shaft diameter of the stepped shaft is a blind hole.

In the above mold, the length of each stepped circular shaft from the minimum end of the shaft diameter to the second maximum end of the shaft diameter is gradually increased.

The invention also provides a mould dismounting device which is characterized by comprising a linear driving mechanism, a bottom plate, a slide rail, a rack, a driving rotating shaft, a gear, a bracket and a switching sleeve, wherein the slide rail is arranged on the bottom plate and can slide relative to the bottom plate; the linear driving mechanism is fixedly arranged on the sliding rail and is in driving connection with the rack; the driving rotating shaft is rotatably arranged on the sliding rail, one end of the driving rotating shaft is provided with the gear which moves in a matched manner with the rack, and the middle part of the driving rotating shaft is provided with an external thread; the other end of the driving rotating shaft is provided with the adapter sleeve for connecting a baffle of a disassembled mould; the support is fixedly arranged on the bottom plate, and an internal thread hole matched with the driving rotating shaft is formed in the support.

The automatic magnet molding system and the method provided by the invention ensure high-density orientation pressing and lossless demolding of the magnet, and improve the degree of automatic production.

The invention also provides a sheet magnet forming die which can replace the production mode of cutting and producing the sheet magnet by the block magnet, improves the production efficiency of the sheet magnet, and has more stable performance and good consistency compared with the cut sheet magnet.

The invention also provides an automatic dismounting device of the magnet mould, which can be used for dismounting the baffle plates of various magnet moulds such as cylindrical, flaky, blocky and the like magnets and improving the efficiency of automatically dismounting the magnets.

Drawings

FIG. 1 is a schematic diagram of an automatic magnet molding system according to the present invention;

FIG. 2a is an enlarged partial schematic view of the magnet of the present invention shown in the figure;

FIG. 2b is a schematic top view of the structure of FIG. 2 a;

FIG. 3a is a schematic view of the mold of the present invention in partial cross-section when closed;

FIG. 3b is a schematic top view of the structure of FIG. 3 a;

FIG. 4 is a schematic view of a partial cross-sectional structure of the mold of the present invention during its removal;

FIG. 5 is an enlarged partial schematic view of the side dams of the present invention with the moving mold and guide plates in closed position;

FIG. 6 is an enlarged partial schematic view of the charging mechanism of the present invention;

FIG. 7 is a schematic top view of the charging mechanism of the present invention;

FIG. 8 is a schematic top view of the orientation molding of the present invention;

FIG. 9 is a schematic cross-sectional front view of the upper ram separated from the die during orientation molding of the present invention;

FIG. 10 is a schematic cross-sectional front view of the upper ram and the die in the orientation molding of the present invention;

FIG. 11 is a schematic front sectional view showing the structure of the sheet-like magnet according to the present invention during orientation molding;

FIG. 12 is a schematic perspective view of a sheet-forming block of the present invention;

FIG. 13 is a perspective view of a stepped shaft of the present invention;

FIG. 14 is a schematic view in partial section of the mold removal apparatus of the present invention;

FIG. 15 is a schematic front sectional view of the sheet magnet orientation molding die of the present invention;

fig. 16 is a front sectional view schematically showing the structure of the sheet-like magnet orientation molding die according to the present invention after it has been disassembled.

The parts in the attached drawings of the invention are as follows:

100. the movable die comprises a movable die 1, a rear baffle 2, a guide plate 3, a material receiving plate 4, a conveyor belt 5, a front baffle 6, a pushing head 9, magnetic powder 10, a base 11, a slide rail 12, a bottom plate 15, a side plate 16, a material box 21, a flat plate scraping blade 22, a pressure head 23, a 25 forming block 24, a formed magnet 26, a stepped shaft 27, a front baffle 28, a nut and a blocking piece 29, an adapter sleeve 30, a support 31, a vertical cylinder fixing plate 32, a pushing rod 33, a gear 34, a rotating shaft 35, a rack 36, a cylinder 37, a self-locking thread pair 38, a bottom plate 39, and cylinder bases in horizontal directions, wherein the cylinder bases are provided with orientation pole heads 7, 13, 18, 20, 36

cylinders

8, 14, 17 and 19.

Detailed Description

The following detailed description of the present invention is provided in conjunction with the accompanying drawings and examples to provide a better understanding of aspects and advantages of the invention. However, the specific embodiments and examples described below are for illustrative purposes only and are not limiting of the invention.

In order to realize the aim of ensuring high-density orientation pressing and nondestructive demoulding of the magnet and improving the degree of automatic production at the same time in the atmosphere or under the anaerobic or low-oxygen condition, a novel automatic orientation forming system and a novel automatic orientation forming method are provided.

The movable die comprises a bottom plate, a front baffle and a rear baffle, wherein a forming area matched with the upper pressure head orientation forming device is arranged between the front baffle and the rear baffle on the bottom plate.

The magnet pressing orientation forming process of the invention is shown in figure 1 and is divided into a plurality of stations. No. 1 station, No. 2 station, No. 3 station and No. 4 station set up according to the preface.

The slide rail is fixedly arranged on the base, and the slide rail extends to the No. 4 station from the No. 1 station.

And the left guide plate and the right guide plate are fixedly arranged on the base, are respectively arranged at the left side and the right side of the movable die and extend from the No. 4 station to the No. 2 station.

The movable mould can move between the guide plates 2 fixed on the base 10 and on the slide rail 11, and the power components such as a hydraulic cylinder, an air cylinder or a servo motor and the like and the position sensor act together to move between the stations. As shown in fig. 11, the bottom plate 12 is connected to the cylinder by a push rod 32, and the bottom plate 12 can drive the movable mold to move on the slide rail.

Wherein, No. 1 station is the material taking station, is equipped with extracting device, is responsible for shifting out the magnet that suppresses by power unit such as cylinder.

No. 2 station is a mold assembly station and is provided with a left baffle, a right baffle, a side baffle mold closing device and a mold unloading device, and at the station, the mold is assembled by a left baffle, a right baffle and a movable mold only provided with a front baffle, a rear baffle and a bottom plate.

And the No. 3 station is a feeding station and is provided with a feeding mechanism, and after the die moves to the station, the die is weighed by adopting a known technology such as an automatic powder weighing machine and is sent to a material box. The material box sends the magnetic powder into the movable die by the power mechanism.

No. 4 station is orientation forming station, is equipped with pressure head orientation forming device on, and after pressure head and the removal mould compound die on this station, through the magnetic field orientation to the magnetic, then compression moulding. Of course, a horizontally oriented pole head may be provided. In addition, it should be noted that the station 2 device and the station three device do not conflict with each other in the spatial position on the two sides of the mold and above the mold, and they can be integrated together.

After the magnetic powder in the movable die is subjected to orientation molding in the stations 1-4 in sequence, the movable die returns to the station 2 to remove the baffles 15 on the left side and the right side, then returns to the station 1 to take out the molded magnet, and then enters the next cycle.

The specific structure and operation steps are as follows:

as shown in fig. 2a and 2b, the moving mold 100 has only the front barrier 5, the rear barrier 1 and the bottom plate 12 at station No. 1. The power driving mechanism can be a cylinder, and the cylinder base 8 is fixed on the base 10. The air cylinder 7 fixed on the air cylinder base 8 pushes the magnet 24 which is formed by the previous orientation out of the working position by the corresponding push head 6. The pushed-out magnet can be pushed out onto the conveyor belt 4 by the material connecting plate 3 for subsequent processing.

As shown in fig. 3a and 3b, the movable mold 100 is assembled with the left and right side dams 15 and the movable mold 100 at station No. 2 by a power mechanism such as a cylinder 13. The cylinder 13 is mounted on a cylinder base 14.

The assembly process is shown in figure 4. And the left guide plate and the right guide plate are provided with vertical respective openings at the No. 2 station. The die closing device comprises die closing driving mechanisms arranged on two sides of the left guide plate and the right guide plate, and the die closing driving mechanisms are respectively connected with push plates at the openings and used for pushing the left side baffle and the right side baffle to the movable die to close the dies.

The distance between the left guide plate and the right guide plate is larger at the position of the No. 2 station than at other stations, the left guide plate and the right guide plate are respectively connected with a support plate at the bottom of the inner side facing the movable mould, the upper surface of the support plate is flush with the bottom plate of the movable mould, and the support plates are respectively separated from the bottom plate by a certain gap.

Only a small part of the lower part of the left and right side guards 15 is on the base plate 12 after the molds are closed. When the cylinders 13 on the two sides of the movable mold 100 are loosened, the side baffle 15 inclines outwards under the action of gravity, the outer edge of the bottom end is supported on the supporting plate vertically connected with the side baffle, the outer edge of the upper end leans against the guide plate 2 in an inclined mode, the side baffle 15 is separated from the movable mold, and mold unloading is completed.

Meanwhile, the left side and the right side of the mold back baffle 1 are respectively provided with a groove, and the corresponding positions of the two side baffles 15 are respectively provided with a bulge matched with the grooves. When the two-side cylinders 13 are clamped, the grooves on the two sides of the rear baffle plate 1 and the protrusions of the two side plates 15 are matched together, and the assembly of the movable mold 100 and the left and right side baffle plates 15 is completed.

In the station No. 2, the guide plates 2 are thinned and thickened as shown in FIG. 5, and when the movable die moves to the station No. 3, the two guide plates 2 and the side baffle plates 15 are gradually matched in a sliding mode.

As shown in fig. 6 and 7, the movable mold 100 is stopped at the position No. 3, and then a power mechanism, such as an air cylinder 18, moves the magazine 16 containing the magnetic powder 9 to the upper part of the mold, and reciprocates for a plurality of times in the direction perpendicular to the moving direction of the mold, and at the same time, the power mechanism, such as an air cylinder 20, drives the flat blade 21 to reciprocate for a plurality of times back and forth in the powder box 16 along the moving direction of the mold, thereby ensuring that the magnetic powder is uniformly distributed in the mold. Wherein the

parts

17, 19 are cylinder bases.

As shown in fig. 8, the moving mold 100 performs the orientation molding at station No. 4. Here, a horizontally oriented pole head 39 is also provided.

The pressed moving die 100 is moved to the No. 2 station, and the two side baffles 15 are separated from the moving die 100 due to the action of gravity.

And moving the movable die to the No. 1 station, and taking out the magnet to enter the next cycle.

The magnet orientation forming method and the structure of the invention are not only suitable for the orientation forming of the single magnet, but also can further change the movable die and the upper pressure head so as to automatically produce various magnets.

As shown in fig. 9 and 10, the bottom plate 12 of the movable mold 100 can be changed to a bottom plate 38 with a plurality of semicircular forming areas, and the upper ram 22 can be used to automatically produce cylindrical magnets in one or more dies according to the above process.

If the sheet-shaped magnet is formed, the system also comprises a front baffle dismounting device, wherein the front baffle dismounting device comprises a power driving device and a connecting device for connecting the front baffle and the power driving device.

For example, the mold for sheet-shaped magnet may be configured as shown in fig. 11, and a molding block 23 having a blind circular hole and a plurality of molding blocks 25 having a through hole in the middle as shown in fig. 12 are added to the base plate 12. The base plate is intended for use in an automated molding system and may or may not be used if the mold is used alone to mold the sheet magnet. The forming blocks 23 and 25 are strung together by means of a stepped shaft 26 as shown in fig. 13, and the gap between the two is large enough so that the pressure applied to the forming

blocks

23 and 25 during forming is directly transmitted to the front and rear fenders and the bottom plate. The stepped shaft 26 and the front baffle 27 may be fixed together by a baffle nut 28.

And circular shafts with shaft diameters arranged from small to large in sequence are arranged on the stepped shaft.

The number of the forming blocks corresponds to the order of the stepped shaft, each forming block is matched and installed with the excircle of each stepped shaft of the stepped shaft through an inner hole, and the upper forming area of each forming block is formed into an L shape by two planes which are vertical to each other. And after the forming blocks and the stepped shaft are installed, a U-shaped groove is formed in the upper forming area of each two forming blocks.

The upper pressing head is provided with pressing heads with the same number as the U-shaped grooves of the forming area, and each pressing head is a protrusion which is correspondingly matched with each U-shaped groove and is used for forming the sheet magnet in the U-shaped groove when pressing down.

And the outer sides of the forming blocks at the two ends of the stepped shaft are provided with the front baffle and the rear baffle.

In order to disassemble the baffle of the mold, a mold disassembling device as shown in fig. 14 may be designed.

The dismounting device comprises a linear driving mechanism, a bottom plate, a sliding rail, a rack, a driving rotating shaft, a gear, a support and a switching sleeve, wherein the sliding rail is arranged on the bottom plate and can slide relative to the bottom plate.

The linear driving mechanism is fixedly arranged on the sliding rail and is in driving connection with the rack.

The driving rotating shaft is rotatably arranged on the sliding rail, one end of the driving rotating shaft is provided with the gear which moves in a matched manner with the rack, and the middle part of the driving rotating shaft is provided with an external thread; the other end of the driving rotating shaft is provided with the switching sleeve which is used for connecting the baffle of the detached die.

The support is fixedly arranged on the bottom plate, and an internal thread hole matched with the driving rotating shaft is formed in the support.

The linear driving mechanism is a cylinder or a hydraulic cylinder.

The front baffle plate 27 and the adapter sleeve 29 are fixed together through screws.

After the material is taken at station No. 1, a linear driving mechanism, such as an air cylinder 36, drives a rack 35 mounted on a slide rail of the bottom plate 12 to move downwards, and drives a gear 33 on a rotating shaft 34 to drive the rotating shaft 34 to rotate. As shown in fig. 14, the cylinder 36 is mounted on the cylinder fixing plate 31. The rotating shaft 34 and the bracket 30 fixed on the bottom plate 12 are connected through a self-locking thread pair 37. At the moment, the rotating shaft moves a small distance to the mold along the moving direction of the mold, so that the adapter sleeve 29, the front baffle 28, the forming block 25 and the forming block 23 are pushed step by step to compress the rear baffle 1. And then enters a No. 2 station to assemble the side baffle 15.

After the orientation molding is completed at station No. 4 as shown in fig. 15, the moving mold 100 is moved to station No. 2 to separate the side dams 15.

After returning to the station No. 2, as shown in fig. 16, the linear driving mechanism, such as the air cylinder 36, drives the rack 35 mounted on the slide rail of the bottom plate 12 to move upward, and drives the gear 33 on the rotating shaft 34 to drive the rotating shaft 34 to rotate.

The stepped shaft 26 may have a diameter from thin to thick, and may be made gradually longer along the length in the central direction, for example, by 0.5mm per section.

At the moment, the rotating shaft 34 moves away from the mold, so that the front baffle plate 27 and the central stepped shaft are driven to pull the forming

blocks

25 and 23 step by step, and the separation of the magnet and the side surfaces of the forming blocks is realized.

It should be noted that, if not mentioned, the power driving device in the present invention may be a hydraulic cylinder, an air cylinder, a servo motor, or the like.

Example 1

The molding process is performed in the direction of 3.1X 20.1mm as shown in FIGS. 9 to 10³The forming device of the columnar magnet is put into a press to produce in the atmospheric environment.

The specific operation steps are as follows:

s1: the magnet 24 which is pressed and formed last time is pushed out by the air cylinder at the No. 1 station, and the formed magnet 24 is a cylindrical magnet;

s2: the moving die driving device drives the parts except the baffle plates on the two sides, namely the moving die 100 to the No. 2 station;

s3: the cylinder 13 clamps the two side baffles 15 to enable the mold to be closed;

s4: under the clamping condition of the air cylinder 13, after the mold continues to move forward for a certain distance under the driving of the movable mold driving device, the distance between the baffle plates 15 at the two sides and the guide plate 2 is gradually reduced to be in close sliding fit, and the air cylinder 13 is released;

s5: the mold moves forward to a No. 3 station, and 48H magnetic powder is filled in the mold through a feeding mechanism;

s6: the die stops at the No. 4 station, the upper pressure head 22 descends, and magnetic field orientation molding is carried out;

s7: the upper ram 22 is raised;

s8: the mold is moved to the No. 2 station, and the baffles on the two sides are automatically separated under the action of gravity;

s9: the mould is moved to the position of No. 1 station, and the magnet 24 which is pressed and formed last time is pushed out by the air cylinder; and entering the next cycle.

This embodiment automatically completes the automatic molding of the cylindrical magnet. The embodiment is suitable for occasions with low requirements on magnet density in molding.

The magnetic properties and system production efficiency of the magnets formed in this example are shown in table 1.

Example 2

The forming and the forming as shown in figures 9-10 are 5.15 multiplied by 20.1mm³The molding apparatus for a columnar magnet was placed in a hermetic press, and after repeated vacuum-pumping, nitrogen was charged until the oxygen content was below 100ppm, and the magnet was produced by the molding process of example 1 in the other steps.

The embodiment is suitable for occasions with high requirements on the density of the magnet in automatic forming.

Example 3

Molding 146X 80X 12 mm as shown in FIG. 11³The forming device of the sheet magnet is put into a press to be produced in the atmospheric environment.

S1: the magnet 24 which is pressed and formed last time is pushed out by the air cylinder 7 at the No. 1 station, and the formed magnet 24 is a square piece;

s2: the linear driving mechanism, such as an air cylinder 36, drives a rack 35 mounted on the slide rail of the bottom plate 12 to move downwards, and drives a gear 33 on the rotating shaft 34 to drive the rotating shaft 34 to rotate. The rotating shaft 34 is connected with the bracket 30 fixed on the bottom plate 12 through a self-locking thread pair 37. At the moment, the rotating shaft moves a small distance from the mold along the moving direction of the mold, so that the adapter sleeve 29, the front baffle plate 28, the forming block 25 and the forming block 23 are pushed step by step to compress the rear baffle plate 1, and 4U-shaped pressure grooves are formed.

S3: the moving die driving device drives the parts except the baffle plates 15 on the two sides, namely the moving die 100 to the No. 2 station;

s4: the air cylinder 13 clamps the baffle plates 15 at two sides, so that 42SH magnetic powder is added into the mold at a No. 2 station by the feeding mechanism shown in the figure 7 after the mold is closed;

s5: under the clamping condition of the air cylinder 13, after the mold continues to move forward for a certain distance under the driving of the movable mold driving device, the distance between the baffle plates 15 at the two sides and the guide plate 2 is gradually reduced to be in close sliding fit, and the air cylinder 13 is released;

s7: the upper ram 22 is raised;

s8: the mould is moved to the No. 2 station, and the baffles 15 at the two sides are automatically separated by the action of gravity;

s9: when the mold moves to the station No. 1, a linear driving mechanism such as an air cylinder 36 drives a rack 35 arranged on a slide rail of the bottom plate 12 to move upwards, and a gear 33 on a driving rotating shaft 34 drives the rotating shaft 34 to rotate.

Since the diameter of the stepped shaft 26 is increased from thin to thick, the length increases by 0.5mm in each step in the direction of the central axis. The pivot is kept away from the mould and is removed like this to drive preceding baffle 28 and rightmost end magnet right flank separation 0.5mm, and then step shaft 26 begins to promote first shaping piece 25 and second piece magnet right flank separation 0.5mm, and the separation of the remaining shaping piece 23 realization and the other magnet right flanks is analogized in proper order 0.5 mm.

S10: the magnet 24 after the previous press molding is pushed out by the air cylinder 7 and enters the next cycle.

Example 4

Molding 146X 80X 12 mm as shown in FIG. 11³The sheet magnet molding apparatus was placed in a hermetic press, and after repeated vacuum pumping, nitrogen was charged until the oxygen content was below 100ppm, and the magnet was produced by the molding process of example 3 in the other steps.

The magnets of the 4 embodiments are sintered for 4 hours at 1000-1100 ℃, then tempered for 4 hours at 500-600 ℃ to obtain sintered magnets, and finally ground to required size and then subjected to surface coating to obtain the final product.

TABLE 1

Herein H_cj(kOe) means intrinsic coercive force, B_r(kGs) indicates remanence, (BH)_m(MGOe) refers to the maximum magnetic energy product, H_k/H_cjRefers to the square degree of the intrinsic demagnetization curve.

As can be seen from the above table, the invention can form and produce the magnet under the atmosphere or under the oxygen-free or low-oxygen condition, and ensure the high-density orientation pressing of the magnet.

Meanwhile, the invention adopts the movable mould without baffles on two sides, and the front baffle can be removed according to the requirement, thereby realizing nondestructive demoulding. Meanwhile, the invention adopts a multi-station automatic forming technology, and realizes the aim of automatic production.

Finally, it should be noted that: it should be understood that the above examples are only for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.

Claims

1. An automatic magnet forming system is characterized by comprising a movable die, a movable die driving device, a base, a slide rail, a left guide plate, a right guide plate, a magnet taking device arranged at a station No. 1, a left baffle plate, a right baffle plate, a side baffle plate closing device, a die unloading device, a feeding mechanism arranged at a station No. 3, and an upper pressure head orientation forming device arranged at a station No. 4,

the movable die comprises a bottom plate, a front baffle plate and a rear baffle plate, and a forming area matched with the upper pressure head orientation forming device is arranged between the front baffle plate and the rear baffle plate on the bottom plate;

the No. 1 station, the No. 2 station, the No. 3 station and the No. 4 station are arranged in sequence;

the sliding rail is fixedly arranged on the base and extends from the No. 1 station to the No. 4 station;

the left guide plate and the right guide plate are fixedly arranged on the base, are respectively arranged on the left side and the right side of the movable die and extend from the No. 4 station to the No. 2 station;

the movable mould is driven by the movable mould driving device to slide on the slide rail.

2. The molding system of claim 1, wherein the magnet extracting device provided at station No. 1 comprises a power driving mechanism and a pusher connected to the power driving mechanism for pushing out the moving mold in a left-right direction of the moving mold.

3. The molding system of claim 1, wherein said left and right guide plates are provided with openings at station No. 2, respectively; the die closing device comprises die closing driving mechanisms arranged on two sides of the left guide plate and the right guide plate, and the die closing driving mechanisms are respectively connected with push plates at the openings and used for pushing the left side baffle and the right side baffle to the movable die to close the dies.

4. The molding system of claim 3, wherein said back dam has a recess on each of the left and right sides thereof, and said left and right dams have a projection at the location of the corresponding recess for engaging said recess for clamping said left and right dams to said moving mold.

5. The molding system of claim 1, wherein said mold unloading apparatus is configured to: distance between left side deflector and the right deflector is in No. 2 station departments are greater than in other station departments, left side deflector and right deflector are in the orientation a backup pad is connected separately to the inboard bottom of removal mould, the upper surface of backup pad with the bottom plate of removal mould flushes, the backup pad respectively with the bottom plate separates certain clearance for when unloading left side baffle and right side baffle lean on because of the action of gravity outwards, the outer arris in bottom support in the backup pad, the outer arris in upper end lean on to one side on left side deflector or right deflector.

6. The molding system according to claim 1, wherein a position sensor is provided on the movable mold for detecting a position of the movable mold.

7. The molding system of claim 1, wherein the feeding mechanism comprises a magazine movement power mechanism, a magazine plate wiper, and a driving mechanism, wherein the magazine movement power mechanism, the magazine plate wiper, and the driving mechanism are arranged vertically above the moving mold.

8. The molding system of claim 1, wherein the molding region of the base plate is a molding region of a cylindrical, sheet-like or block-like magnet.

9. The molding system of any one of claims 1 to 8, wherein said station No. 2 and station No. 3 are positionally combined into one station.

10. The molding system of any one of claims 1 to 8, further comprising a front baffle dismounting device comprising a power drive and a coupling device coupling said front baffle and said power drive.

11. An automated molding method using the system of any one of claims 1 to 10, the method comprising the steps of:

the magnet molded at the No. 1 station is pushed out of the movable mold in the lateral direction;

the movable mould is driven to a No. 2 station by a movable mould driving device, and the left and right side baffles are clamped so that the movable mould is matched with the left and right side baffles;

the moving die after die assembly moves forward to a No. 3 station under the driving of a moving die driving device, and magnetic powder is loaded through a charging mechanism;

the movable die filled with the magnetic powder moves forward to a No. 4 station under the driving of a movable die driving device to carry out magnetic field orientation molding;

the moving die after the orientation forming is driven by a moving die driving device to move to a No. 2 station, and the baffles on the left side and the right side are separated from the moving die;

the movable mould is driven by the movable mould driving device to move downwards to the No. 1 station, and the magnet is pushed out;

the system enters the next cycle.

12. The molding method according to claim 11, wherein in the mold closing, in the case where the left and right side fences are clamped by the air cylinder, after the left and right side fences are moved forward by the moving mold for a certain distance by the moving mold driving device, the air cylinder is released after the space between the left and right side fences and the left and right guide plates is gradually reduced to a close sliding fit.

13. The molding method according to claim 11 or 12, wherein the molding is performed in an atmospheric environment or a sealed vacuum environment.