CN113414387B

CN113414387B - Magnet forming die

Info

Publication number: CN113414387B
Application number: CN202110610676.2A
Authority: CN
Inventors: 侯德柱; 吴晓平; 王东明; 王进东; 叶选涨; 陈治安
Original assignee: Beijing Zhong Ke San Huan High Tech Co Ltd
Current assignee: Beijing Zhong Ke San Huan High Tech Co Ltd
Priority date: 2016-12-05
Filing date: 2016-12-05
Publication date: 2023-04-25
Anticipated expiration: 2036-12-05
Also published as: CN108145154A; CN108145154B; CN113414387A

Abstract

The invention relates to a magnet forming die. The die comprises a stepped shaft, a front baffle, a rear baffle, a forming block and an upper pressure head, wherein the stepped shaft comprises round shafts with shaft diameters arranged from small to large in sequence; the number of the molding blocks corresponds to the number of steps of the stepped shaft, an inner hole is formed in the center of each molding block, each molding block is installed in an adaptive manner with the outer circle of the corresponding circular shaft of the stepped shaft through the inner hole, and the upper molding area of each molding block is formed into an L shape through two mutually perpendicular planes; forming a U-shaped groove at the upper forming interval of two adjacent forming blocks after each forming block and the stepped shaft are installed; the upper pressure heads are provided with pressure heads with the same number as the U-shaped grooves of the forming area, and each pressure head is a bulge correspondingly matched with each U-shaped groove and is used for forming a magnet in each U-shaped groove when being pressed down; the outer sides of the two end forming blocks of the stepped shaft are provided with a front baffle and a rear baffle. The magnet forming die is convenient for producing magnets.

Description

Magnet forming die

The application is a divisional application, and the name of the original application is 'an automatic magnet forming system and method, a sheet-shaped magnet forming die and a dismounting device', the application number is 20161105350. X, and the application date is 2016, 12 months and 05 days.

Technical Field

The invention relates to the field of magnet preparation, in particular to a magnet forming die.

Background

With the wide application of rare earth magnets, market scale and competition are increasing. There has been a great deal of attention and effort in the industry to obtain magnets of high performance with less rare earth and with less manual effort to obtain magnets of higher production efficiency and stable performance. Press orientation molding from magnetic powder to magnet is an indispensable key process in the production of magnets. The links of die disassembly and assembly, magnetic powder weighing, powder distribution in the die before compression molding, magnet taking out after orientation molding and the like in the traditional production are all completed manually. Due to the participation of manpower, the oxidation of the magnetic powder and oxygen in contact cannot be effectively avoided in the process, more heavy rare earth has to be added to ensure the performance of the magnet during production, and meanwhile, the production efficiency and the product consistency are severely restricted.

In the prior art, a mode of directly ejecting a magnet after compression molding out of a die from the lower part through a lower pressure head is commonly adopted. The demolding mode causes that when the density of the pressed magnet is too high, even if the mold and the pressing head are sprayed with the demolding agent, the magnet can be stuck together with the mold and cannot be demolded, even if the demolding mode can be used, internal hidden cracks and corner damages can be easily generated, and meanwhile, the damage of the mold in use is short in service life.

Of course, if the hard alloy is used for manufacturing the die and the pressing head, the die hardness of the contact surface of the reinforced magnetic powder can also be used for pressing the high-density magnet. However, replacing the material with cemented carbide has the following disadvantages: on one hand, the material is too hard and difficult to process, and the manufacturing die cost is far higher than that of common die steel. And the hard alloy steel has high hardness, so that the magnet is easy to break during high-load pressing. More importantly, on the other hand, the problem that the magnet and the die are stuck is solved by replacing the die material, but the problems that the magnet and the die are not easy to generate internal hidden cracks and corner damages when the magnet is demolded due to overlarge friction are still solved.

The manual combined die is adopted to press and form the magnet, so that the effect of removing the friction force between the die and the magnet piece can be achieved in the process of die disassembly in theory analysis. However, the die cannot be rapidly decomposed at the same time by manpower, and the magnet can not be removed from the die ideally. In addition, the manual combined die has the advantages of large personnel occupancy rate, low production efficiency and poor product stability.

Also, if the density of the magnet is low, a post-manual sealing isostatic pressing process 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 extension process increase the possibility of oxidation of the magnet, but also about 3% of the magnet is lost due to oil leakage and cannot be recycled. In addition, due to the existence of the isostatic pressing process, the magnet production orientation molding and the magnet sintering process cannot be connected together, and the integrated automatic production of the orientation molding and the magnet sintering cannot be realized. In order to break through the bottleneck and get rid of the situation, research on full-sealed automatic pressing orientation molding technology of magnetic powder is started in the industry.

Therefore, aiming at overcoming the defects of the prior art, in order to realize the aims of guaranteeing high-density orientation pressing and nondestructive demolding of the magnet and improving the degree of automatic production under the condition of atmosphere or no oxygen or low oxygen, a novel automatic orientation forming system and 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 demolding of magnets and improve the degree of automatic production. The invention also provides a sheet magnet forming die to provide forming of the sheet magnet. The invention also provides a dismounting device to provide an automatic magnet dismounting device.

The invention provides an automatic magnet forming system, which comprises a movable mold, a movable mold driving device, a base, a sliding rail, a left guide plate, a right guide plate, a magnet pushing device arranged at a station No. 1, a left baffle plate, a right baffle plate, a side baffle plate mold closing device, a mold 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 mold 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 station 1, the station 2, the station 3 and the station 4 are arranged in sequence; the sliding rail is fixedly arranged on the base, and extends from the station No. 1 to the station No. 4; 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 station No. 4 to the station No. 2; the movable mould is driven by the movable mould driving device to slide on the sliding rail.

The forming system is characterized in that the magnet pushing-out device arranged at the station 1 comprises a power driving mechanism and a pushing head connected with the power driving mechanism, and the magnet pushing-out device is used for pushing out the movable die in the left-right direction of the movable die.

In the molding system, the left guide plate and the right guide plate are respectively provided with holes at the station No. 2; the die clamping device comprises die clamping driving mechanisms arranged on two sides of the left guide plate and the right guide plate, and pushing plates are respectively connected to the die clamping driving mechanisms at the positions of the openings and used for pushing the left baffle plate and the right baffle plate to be combined on the movable die for die clamping.

According to the molding system, the left side and the right side of the rear baffle are respectively provided with the grooves, the left side baffle and the right side baffle are respectively provided with the protrusions matched with the grooves at the corresponding groove positions, and the matching is used for enabling the left side baffle and the right side baffle to be matched with the movable mold.

The above-mentioned molding system, the structure of unloading mould device is: the distance between left deflector and the right deflector is greater than in other stations in station 2 department, left deflector and right deflector are towards the inboard bottom of movable mould is connected a backup pad respectively, the upper surface of backup pad with movable mould's bottom plate flushes, the backup pad respectively with certain clearance separates with the bottom plate, makes when the unloading mould left side baffle and right side baffle outwards slope owing to gravity effect, the bottom outer arris support in the backup pad, the upper end outer arris lean on left deflector or right deflector.

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

The forming system comprises the feeding mechanism, the feeding mechanism comprises a feeding box moving power mechanism, a feeding box flat scraping blade and a driving mechanism, and the feeding mechanism comprises the feeding box moving power mechanism, the feeding box flat scraping blade and the driving mechanism are mutually vertically arranged above the moving die.

In the molding system, the molding area of the bottom plate is the molding area of the cylindrical, sheet-shaped or block-shaped magnet.

In the molding system, the station No. 2 and the station No. 3 are combined into one station in position.

The molding system further comprises a front baffle detaching device, wherein the front baffle detaching device comprises a power driving device and a connecting device for connecting the front baffle and the power driving device.

The invention provides an automatic forming method by utilizing the system, which comprises the following steps: the magnet molded at station 1 is pushed out of the mobile mold without side dams; the movable mould driving device drives the movable mould to a station No. 2, and clamps the left baffle plate and the right baffle plate so as to lead the movable mould to be matched with the left baffle plate and the right baffle plate; the moving die after die assembly is driven by a moving die driving device to move forward to a station No. 3, and magnetic powder is filled through a feeding mechanism; the moving die filled with the magnetic powder is driven by a moving die driving device to move forward to a station No. 4 for magnetic field orientation molding; the moving die after orientation molding is driven by a moving die driving device to move down to a station No. 2, and the baffles on the left side and the right side are separated from the moving die; the moving die is driven by a moving die driving device to move to a station 1, and the magnet is pushed out; the system proceeds to the next cycle.

According to the forming method, when the air cylinders clamp the left baffle plates and the right baffle plates during die assembly, the moving die drives the left baffle plates and the right baffle plates to move forward for a certain distance under the driving of the moving die driving device, and after the distance between the left baffle plates and the right baffle plates is gradually reduced to be in tight sliding fit, the air cylinders are loosened.

The molding process is carried out in an atmospheric environment or a sealed vacuumizing 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 which are sequentially arranged from small to large; the number of the molding blocks corresponds to the number of steps of the stepped shaft, an inner hole is formed in the center of each molding block, each molding block is installed in an adaptive manner with the outer circle of each stepped circular shaft of the stepped shaft through the inner hole, and the upper molding area of each molding block is formed into an L shape by two planes which are perpendicular to each other; after the forming blocks and the stepped shaft are installed, forming a U-shaped groove in the upper forming interval of each two forming blocks; the upper pressure heads are provided with pressure heads with the same number as the U-shaped grooves of the forming area, and each pressure head is a bulge correspondingly matched with each U-shaped groove and is used for forming a sheet-shaped magnet in each U-shaped groove when being pressed down; the front baffle and the rear baffle are arranged on the outer sides of the forming blocks at the two ends of the stepped shaft.

According to the die, the front baffle is arranged at the position of the smallest shaft diameter end of the stepped shaft, the through hole is formed in the center of the front baffle, the threaded head penetrating through the through hole is outwards extended at the smallest shaft diameter end of the stepped shaft, and the baffle and the nut are arranged on the threaded head and used for locking the die.

According to the die, the rear baffle is arranged at the position with the largest shaft diameter of the stepped shaft, and the inner hole of the forming block on the circular shaft with the largest shaft diameter of the stepped shaft is a blind hole.

According to the die, the length of each step of round shaft from the minimum shaft diameter end to the maximum shaft diameter sub-maximum end of the stepped shaft is gradually increased.

The invention also provides a die dismounting device which is characterized by comprising a linear driving mechanism, a bottom plate, a sliding rail, a rack, a driving rotating shaft, a gear, a bracket and an adapter 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 mode with the rack, and the middle part of the driving rotating shaft is provided with external threads; the other end of the driving rotating shaft is provided with the adapter sleeve which is used for connecting a baffle of the disassembled die; the bracket is fixedly arranged on the bottom plate, and is provided with an internal threaded hole matched with the driving rotating shaft.

The magnet automatic molding system and the method provided by the invention ensure high-density orientation pressing and nondestructive 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 producing the sheet magnet by cutting the block magnet at present, improves the production efficiency of the sheet magnet, and has more stable performance and good consistency compared with the cut sheet magnet due to the formed sheet magnet.

The invention also provides an automatic dismounting device for the magnet mould, which can dismount the baffle plates of various magnet moulds such as cylindrical, sheet-shaped, block-shaped and other magnets, and improves the efficiency of automatically dismounting the magnets.

Drawings

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

FIG. 2a is a schematic view of a partially enlarged construction of the magnet of the present invention being pushed out;

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

FIG. 3a is a schematic view of a partial cross-sectional structure of a mold of the present invention 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 when the mold is disassembled;

FIG. 5 is a schematic view of a partially enlarged structure of a side dam and a movable mold and a guide plate at the time of mold closing according to the present invention;

FIG. 6 is a schematic view of a partially enlarged construction 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 present invention in orientation;

FIG. 9 is a schematic elevational cross-sectional view of the upper ram separated from the mold during orientation molding in accordance with the present invention;

FIG. 10 is a schematic view of the structure of the upper ram in the present invention in a cross-sectional elevation view when the upper ram is closed with the mold in the orientation molding;

FIG. 11 is a schematic view of the structure of the sheet-like magnet of the present invention in a front cross-section during orientation molding;

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

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

FIG. 14 is a schematic view in partial cross-sectional view of a mold disassembly apparatus according to the present invention;

FIG. 15 is a schematic view showing a front sectional structure of an orientation molding die for a sheet-like magnet of the present invention;

fig. 16 is a schematic view showing a front sectional structure of the sheet-shaped magnet orientation molding die of the present invention after being disassembled.

The components in the drawings of the invention are:

100. moving mold 1, rear baffle 2, guide plate 3, receiving plate 4, conveyor 5, front baffle 6, pusher head 9, magnetic powder 10, base 11, slide rail 12, bottom plate 15, side plate 16, magazine 21, flat blade 22,

ram

23, 25 forming block 24, magnetic powder 26, stepped shaft 27, front baffle 28, nut, stop 29, adapter sleeve 30, bracket 31, vertical cylinder fixing plate 32, push rod 33, gear 34, pivot 35, rack 36, cylinder 37, self-locking screw pair 38, bottom plate 39, horizontally oriented

polar heads

7, 13, 18, 20, 36

cylinders

8, 14, 17, 19 cylinder base.

Detailed Description

The following detailed description of specific embodiments of the invention is provided in connection with the accompanying drawings and examples in order to provide a better understanding of the aspects and advantages of the invention. However, the following description of specific embodiments and examples is for illustrative purposes only and is not intended to be limiting of the invention.

In order to realize the aim of guaranteeing high-density orientation pressing and nondestructive demolding of the magnet and improving the degree of automatic production under the condition of atmosphere or no oxygen or low oxygen, a novel automatic orientation forming system and 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 press orientation molding process of the present invention is shown in fig. 1 and is divided into a plurality of stations. The station No. 1, the station No. 2, the station No. 3 and the station No. 4 are sequentially arranged.

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

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 station No. 4 to the station No. 2.

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

The station 1 is a material taking station, a material taking device is arranged, and a power mechanism such as an air cylinder is used for moving out the pressed magnet.

The station No. 2 is a die assembly station, and is provided with a left baffle plate, a right baffle plate, a side baffle plate die assembly device and a die unloading device, wherein the die is assembled by the left baffle plate, the right baffle plate, the front baffle plate, the rear baffle plate and the moving die of the bottom plate.

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

The station No. 4 is an orientation molding station, an upper pressure head orientation molding device is arranged, and after the pressure head and the movable die are assembled on the station, the magnetic powder is oriented through a magnetic field, and then is pressed and molded. Of course, a horizontally oriented pole head may also be provided. In addition, it should be pointed out that the station device No. 2 and the station device No. three do not collide in space positions on both sides of the die and above the die, and the station device No. 2 and the station device No. three can be assembled together.

After the magnetic powder in the moving die is subjected to orientation molding sequentially through the stations 1-4, the moving die returns to the station No. 2 to remove the baffles 15 on the left side and the right side, then returns to the station No. 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, 2b, the moving die 100 has only the front barrier 5, the rear barrier 1, and the bottom plate 12 at station No. 1. The power driving mechanism may be a cylinder, and the cylinder base 8 is fixed on the base 10. The cylinder 7 fixed on the cylinder base 8 pushes the magnet 24 formed by the last orientation out of the station by the corresponding push head 6. The ejected magnets can be ejected onto the conveyor belt 4 by the web 3 for subsequent processing.

As shown in fig. 3a and 3b, the movable mold 100 is at station No. 2, and the left and right side shutters 15 are combined with the movable mold 100 by a power mechanism such as an air cylinder 13. The cylinder 13 is mounted on a cylinder mount 14.

The combination process is shown in fig. 4. The left guide plate and the right guide plate are provided with vertical openings at the station No. 2. The mold clamping device comprises mold clamping driving mechanisms arranged on two sides of the left guide plate and the right guide plate, and pushing plates are respectively connected to the mold clamping driving mechanisms at the positions of the openings and used for pushing the left baffle plate and the right baffle plate to be combined on the movable mold to clamp the molds.

The distance between left deflector and the right deflector is greater than in other stations in station 2 department, left deflector and right deflector are towards the inboard bottom of movable mould is a backup pad of connection respectively, the upper surface of backup pad with movable mould's bottom plate flushes, the backup pad respectively with the bottom plate separates certain clearance.

Only a small portion of the lower portions of the left and right side dams 15 are located on the bottom plate 12 after mold clamping. When the air cylinders 13 on the two sides of the movable die 100 are loosened, the side baffles 15 incline outwards under the action of gravity, the outer edges at the bottom end are supported on the supporting plates vertically connected with the side baffles, and the outer edges at the upper end lean against the guide plates 2, so that the separation of the side baffles 15 and the movable die is realized, and the die unloading work is completed.

Meanwhile, the left side and the right side of the mold back plate 1 are respectively provided with a groove, and the corresponding positions of the two side plates 15 are respectively provided with a bulge matched with the grooves. When the cylinders 13 on both sides are clamped, the grooves on both sides of the tailgate 1 are engaged with the protrusions of the side plates 15, thereby completing the assembly of the moving mold 100 with the left and right side tailgates 15.

In the station No. 2, the guide plates 2 are thickened from thin as shown in fig. 5, and when the moving die moves to the station No. 3, the two guide plates 2 and the side baffle plates 15 are gradually matched in a sliding way.

As shown in fig. 6 and 7, the moving die 100 stops to station No. 3, and then a power mechanism such as an air cylinder 18 moves a cartridge 16 previously filled with the magnetic powder 9 above the die and reciprocally moves a plurality of times in a direction perpendicular to the moving direction of the die, while at the same time the power mechanism such as an air cylinder 20 drives a flat blade 21 reciprocally moves a plurality of times back and forth in the moving direction of the die within the cartridge 16, thereby ensuring uniform distribution of the magnetic powder in the die. Wherein the

members

17, 19 are cylinder bases.

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

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

And (3) moving the movable die to a station No. 1, and taking out the magnet to enter the next circulation.

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

As shown in fig. 9 and 10, the bottom plate 12 in the movable mold 100 can be changed into a bottom plate 38 with a plurality of semicircular forming areas, and the cylindrical magnet can be automatically produced by one mold with multiple pieces according to the process by matching the upper pressing head 22.

The system further comprises a front baffle removing device, wherein the front baffle removing device comprises a power driving device and a connecting device for connecting the front baffle and the power driving device.

For example, a forming die for a sheet-shaped magnet can be constructed as shown in fig. 11, and a forming block 23 having blind circular holes and a plurality of forming blocks 25 having through holes in the middle are added to the base plate 12 as shown in fig. 12. The bottom plate is intended for use in an automated molding system, and may not be used if the mold is used alone to mold the sheet-like magnet. The molding blocks 23 and 25 are strung together by a stepped shaft 26 as shown in fig. 13, and the gap between the two is large enough that the pressure exerted by the molding blocks 23 and 25 at the time of molding is directly transmitted to the front and rear shutters and the bottom plate. The stepped shaft 26 and the front baffle 27 may be fixed together by a flap nut 28.

The stepped shaft is provided with round shafts with shaft diameters which are sequentially arranged from small to large.

The number of the molding blocks corresponds to the number of steps of the stepped shaft, each molding block is installed in an adaptive manner through an inner hole and the outer circle of each stepped circular shaft of the stepped shaft, and the upper molding area of each molding block is formed into an L shape through two planes which are perpendicular to each other. After the forming blocks and the stepped shaft are installed, a U-shaped groove is formed in the upper forming section of each two forming blocks.

The upper pressure heads are provided with pressure heads with the same number as the U-shaped grooves of the forming area, and 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 being pressed down.

The front baffle and the rear baffle are arranged on the outer sides of the forming blocks at the two ends of the stepped shaft.

For detaching the shutter of the mold, a mold detaching 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 bracket and an adapter 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 mode with the rack, and the middle part of the driving rotating shaft is provided with external threads; the other end of the driving rotating shaft is provided with the adapter sleeve which is used for connecting a baffle of the disassembled die.

The bracket is fixedly arranged on the bottom plate, and is provided with an internal threaded hole matched with the driving rotating shaft.

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

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

After the material is taken from the station 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 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 is connected with the bracket 30 fixed on the bottom plate 12 through a self-locking screw pair 37. At this time, the rotating shaft moves a small distance towards the die along the moving direction of the die, 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 press the rear baffle 1. And then enters station number 2 assembly side dams 15.

At station No. 4, as shown in fig. 15, after the orientation molding is completed, the moving mold 100 is moved to station No. 2 to separate the side fence 15.

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

The stepped shaft 26 may be tapered in length in the center direction from thin to thick, for example, 0.5mm per segment.

At this time, the rotating shaft 34 moves away from the die, so that the front baffle 27 and the central stepped shaft are driven to pull the forming block 25 and the forming block 23 step by step, and separation of the magnet and the side face of the forming block is realized.

It should be noted that, unless otherwise 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

Will be molded as shown in FIGS. 9 to 10

The forming device of the columnar magnet is put into a press and placed in an atmospheric ringAnd (5) producing in the environment.

The specific operation steps are as follows:

s1: pushing out the piece 24 cylindrical magnet formed by the last pressing by a cylinder at a station 1;

s2: the movable mould driving device drives the parts except the baffles at the two sides, namely the movable mould 100 to the station No. 2;

s3: the air cylinders 13 clamp the two side baffles 15 to clamp the mold;

s4: under the condition that the air cylinder 13 is clamped, after the die continues to advance for a certain distance under the drive of the movable die driving device, the distance between the baffle plates 15 on the two sides and the guide plate 2 is gradually reduced to be in close sliding fit, and then the air cylinder 13 is loosened;

s5: the die moves forward to the station 3, and 48H magnetic powder is filled in the die through a feeding mechanism;

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

s7: the upper ram 22 is raised;

s8: the die moves to a station No. 2, and the baffles on the two sides are automatically separated under the action of gravity;

s9: the die moves to a station 1, and a cylinder pushes out the cylindrical magnet of the piece 24 after the last press molding; the next cycle is entered.

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

The magnetic properties and system productivity of the magnets molded in this example are shown in table 1.

Example 2

Shaping the materials shown in FIGS. 9 to 10

The molding apparatus for columnar magnet was placed in a sealing press, and after repeated evacuation, nitrogen was introduced until the oxygen content was 100ppm or less, and the other steps were followed to produce a magnet according to the molding process of example 1.

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

Example 3

The molded product shown in FIG. 11 was 146X 80X 12mm ³ The forming device of the sheet-shaped magnet is put into a press for production in the atmospheric environment.

S1: pushing out the piece 24 square sheet formed by the last pressing by the cylinder 7 at the station 1;

s2: the linear driving mechanism, such as a cylinder 36, drives a rack 35 mounted on a slide rail of the base 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 screw pair 37. At this time, the rotating shaft moves along the moving direction of the die at a small distance to the die, so as to push the adapter sleeve 29, the front baffle 28, the forming block 25 and the forming block 23 to press the rear baffle 1 step by step, thereby forming 4U-shaped profiling grooves.

S3: the part except the baffles 15 on the two sides is driven by a movable mould driving device, namely the movable mould 100 is moved to a station No. 2;

s4: the air cylinders 13 clamp the baffles 15 on the two sides so that 42SH magnetic powder is added by a feeding mechanism shown in FIG. 7 at a station No. 2 after the die is assembled;

s5: under the condition that the air cylinder 13 is clamped, after the die continues to advance for a certain distance under the drive of the movable die driving device, the distance between the baffle plates 15 on the two sides and the guide plate 2 is gradually reduced to be in close sliding fit, and then the air cylinder 13 is loosened;

s7: the upper ram 22 is raised;

s8: the die moves to the station No. 2, and the baffles 15 on the two sides are automatically separated under the action of gravity;

s9: the die moves to the station 1, and 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 drives a gear 33 on a rotating shaft 34 to drive the rotating shaft 34 to rotate.

Since the stepped shaft 26 increases in diameter from thin to thick, it increases by 0.5mm per segment in the length direction of the central shaft. The rotating shaft moves away from the die, so that the front baffle 28 and the right side face of the rightmost magnet are driven to be separated by 0.5mm, the rear stepped shaft 26 starts to push the first forming block 25 and the right side face of the second magnet to be separated by 0.5mm, and the rest forming blocks 23 are analogized to realize the separation from the right side faces of the rest magnets by 0.5mm.

S10: the product of the piece 24 after the last press forming is pushed out by the cylinder 7 and enters the next cycle.

Example 4

The molded product shown in FIG. 11 was 146X 80X 12mm ³ The forming device of the sheet-shaped magnet is placed in a sealing press, and after repeated vacuum pumping, nitrogen is filled until the oxygen content is below 100ppm, and other steps are carried out to produce the magnet according to the forming process of the embodiment 3.

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 surface-coated after being ground to the required size.

TABLE 1

H herein _cj (kOe) means intrinsic coercivity, B _r (kGs) means remanence, (BH) _m (MGOe) means the maximum magnetic energy product, H _k /H _cj Refers to the squareness of the intrinsic demagnetizing curve.

From the table, the invention can mold and produce the magnet under the atmosphere or under the anaerobic or hypoxia condition, thereby ensuring the high-density orientation pressing of the magnet.

Meanwhile, the invention adopts the movable mould, and the two side baffles are not arranged, and the front baffle can be removed according to the requirement, so that the nondestructive demoulding can be realized. Meanwhile, the invention adopts a multi-station automatic molding technology, thereby realizing the aim of automatic production.

Finally, it should be noted that: it is apparent that the above examples are only illustrative of the present invention and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present invention.

Claims

1. A magnet forming die is characterized by comprising a stepped shaft, a front baffle, a rear baffle, a forming block and an upper pressure head, wherein,

the stepped shaft comprises round shafts with shaft diameters which are sequentially arranged from small to large;

the number of the molding blocks corresponds to the number of steps of the stepped shaft, an inner hole is formed in the center of each molding block, each molding block is installed in an adaptive manner with the outer circle of the corresponding circular shaft of the stepped shaft through the inner hole, and the upper molding area of each molding block is formed into an L shape by two planes which are perpendicular to each other; forming a U-shaped groove in the upper forming interval of two adjacent forming blocks after each forming block and the stepped shaft are installed;

the upper pressure heads are provided with pressure heads with the same number as the U-shaped grooves of the forming area, and each pressure head is a bulge correspondingly matched with each U-shaped groove and is used for forming a magnet in each U-shaped groove when being pressed down;

2. The magnet forming die of claim 1, wherein the front baffle is mounted at the minimum shaft diameter end of the stepped shaft, a through hole is formed in the center of the front baffle, a threaded head penetrating through the through hole extends outwards at the minimum shaft diameter end of the stepped shaft, and a baffle and a nut are mounted on the threaded head and used for locking the die.

3. The magnet forming die according to claim 1 or 2, wherein the rear baffle is mounted on the outer side of the forming block 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 end of the stepped shaft is a blind hole.

4. The magnet forming die according to claim 1 or 2, wherein the stepped shaft is gradually longer in length from a minimum shaft diameter end to a maximum shaft diameter sub-maximum end per step of the circular shaft.

5. The magnet forming die of claim 1 further comprising a dismounting device, said dismounting device comprising a linear drive mechanism, a base plate, a slide rail, a rack, a drive shaft, a gear, a bracket, an adapter sleeve,

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 mode with the rack, and the middle part of the driving rotating shaft is provided with external threads; the other end of the driving rotating shaft is provided with the adapter sleeve which is used for connecting a baffle of the disassembled die;