CN212625163U - Hot-pressing device for batch preparation of rare earth permanent magnet rings - Google Patents
Hot-pressing device for batch preparation of rare earth permanent magnet rings Download PDFInfo
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- CN212625163U CN212625163U CN202021159564.7U CN202021159564U CN212625163U CN 212625163 U CN212625163 U CN 212625163U CN 202021159564 U CN202021159564 U CN 202021159564U CN 212625163 U CN212625163 U CN 212625163U
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Abstract
The utility model discloses a hot press unit for preparing tombarthite permanent magnetism ring in batches, including the vacuum cavity, be provided with a plurality of bed die cavitys in the vacuum cavity side by side, all be provided with high-purity graphite electrode between the outer wall of each bed die cavity and the adjacent bed die cavity, the symmetry is provided with multiunit terrace die pressure head and die pressure head in the vacuum cavity, and terrace die pressure head and die pressure head are controlled by actuating mechanism. The utility model discloses a plurality of bed die cavitys that set up realize a plurality of magnetic rings of one shot processing, improve work efficiency, the setting in reasonable die cavity clearance ensures the automatic thermal current of each magnetic and changes orientation, the setting of terrace die pressure head and die pressure head realizes two-way suppression, reduce thermal plasticity deformation's resistance, it is even to ensure powder thermal decompression deformation atress, make the magnetic ring have higher magnetic performance and uniformity, and can reduce hot pressing magnetic ring's fracture by a wide margin, and simultaneously, the hot press unit of this structure, it is unrestricted still to ensure hot pressing ring length.
Description
Technical Field
The utility model belongs to the technical field of tombarthite permanent magnet material's preparation, concretely relates to hot press unit for preparing tombarthite permanent magnetism ring in batches.
Background
The hot pressing furnace with the structure adopts unidirectional pressing in the pressing process, so that the problems of uneven powder stress and poor extrusion deformation orientation exist, and meanwhile, only one piece can be pressed at one time, the efficiency is low, and the length of a pressing ring is limited; the existing hot pressing process is one-way pressing, the pressed product is cup-shaped and has a thick cup bottom, the orientation of the magnet close to the bottom has certain deviation, the thick cup bottom needs to be cut off to become a hot pressing ring magnet, and the material utilization rate is not high.
SUMMERY OF THE UTILITY MODEL
To the problem that exists among the prior art, the utility model aims to provide a hot press unit for preparing tombarthite permanent magnetism ring in batches.
The utility model discloses a following technical scheme realizes:
the hot pressing device for preparing the rare earth permanent magnet rings in batches is characterized by comprising a vacuum cavity, wherein a plurality of female die cavities are arranged in the vacuum cavity side by side, high-purity graphite electrodes are arranged between the outer wall of each female die cavity and the adjacent female die cavities, a plurality of groups of male die pressing heads and female die pressing heads are symmetrically arranged in the vacuum cavity, and the male die pressing heads and the female die pressing heads are controlled by a servo hydraulic driving mechanism.
Preferably, a group of male die pressing heads and female die pressing heads are symmetrically arranged in each female die cavity, and a die cavity gap is reserved between the outer walls of the male die pressing heads and the female die pressing heads and the inner wall of the female die cavity where the male die pressing heads and the female die pressing heads are arranged; the specific size of the gap is determined by the wall thickness of the hot-pressing magnetic ring, and the gap can be larger when the hot-pressing isotropic magnetic ring is used for hot-pressing; the hot-pressing anisotropic magnet ring is used for hot-pressing anisotropic magnet rings, the gap size is smaller, and incomplete orientation of extrusion deformation and thermo-rheological is prevented.
Preferably, a vacuum pump connecting port connected with a vacuum pump is arranged on the vacuum cavity.
Preferably, the driving mechanism comprises a male die driving mechanism and a female die driving mechanism which are respectively arranged at two sides of the vacuum cavity, the male die driving mechanism and the female die driving mechanism both comprise a hydraulic oil cylinder and a die set connecting rod assembly, and the die set connecting rod assembly is used for being fixedly connected with a male die pressure head or a female die pressure head which respectively corresponds to the male die pressure head or the female die pressure head.
Preferably, the die carrier connecting rod assembly comprises a longitudinal connecting rod and a branch rod which are integrally arranged, the branch rod penetrates through the vacuum cavity and then is fixedly connected with a male die pressure head or a female die pressure head in a corresponding female die cavity, and the other side of the longitudinal connecting rod is fixedly connected with the hydraulic oil cylinder mounting plate through a horizontal connecting rod.
Preferably, each female die cavity is in a hollow cylindrical shape, the cross sections of the male die pressure head and the female die pressure head are circular, and the female die is provided with a taper not exceeding 0.5 degrees, so that the demolding is facilitated.
Preferably, the male die pressing head, the female die pressing head and the female die cavity are coaxially arranged.
Preferably, the joint of the branch rod and the vacuum cavity is provided with a friction-resistant sealing ring and an oil seal, and a water-cooling interlayer is arranged in the vacuum cavity to prevent the branch rod from deforming and sealing failure caused by high temperature.
The utility model discloses a plurality of bed die cavitys that set up, realize a plurality of magnetic rings of one shot processing, improve work efficiency, the setting in reasonable die cavity clearance ensures the automatic thermal current of each magnetic and changes orientation, the setting of terrace die pressure head and die pressure head, realize two-way suppression, reduce thermal deformation's resistance, it is even to ensure powder thermal decompression deformation atress, make the magnetic ring have higher magnetic performance and uniformity, and can reduce hot pressing magnetic ring's fracture by a wide margin, the hot press unit of this structure simultaneously, still can ensure theoretically that hot pressing ring length is unrestricted.
Drawings
Fig. 1 is a cross-sectional view of the present invention in a top view;
in the figure, 1-a vacuum cavity, 2-a female die cavity, 3-a graphite electrode, 4-a male die pressure head, 5-a female die pressure head, 6-a die cavity gap, 7-a vacuum pump connecting port, 8-a hydraulic oil cylinder, 9-a longitudinal connecting rod, 10-a branch rod, 11-a horizontal connecting rod and 12-a hydraulic oil cylinder mounting plate.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings, and specific embodiments will be given.
The utility model relates to a hot press unit for preparing tombarthite permanent magnetism ring in batches, this hot press unit overcome traditional hot press unit can only one-way suppression and the problem that magnetic ring length is limited, production efficiency is low, realize that two-way suppression, magnetic ring length are unrestricted and can once suppress the purpose of multi-disc magnetic ring.
The vacuum pump comprises a vacuum cavity, a vacuum pump connecting port connected with a vacuum pump is formed in the vacuum cavity, a plurality of hollow cylindrical female die cavities are arranged in the vacuum cavity side by side, high-purity graphite electrodes with the purity of 99.99% are arranged between the outer wall of each female die cavity and the adjacent female die cavities and used for heating, a plurality of groups of male die pressing heads and female die pressing heads with circular cross sections are symmetrically arranged in the vacuum cavity, the male die pressing heads and the female die pressing heads are controlled by a servo driving mechanism and used for controlling the male die pressing heads and the female die pressing heads to move in opposite directions simultaneously, and the male die pressing heads and the female die pressing heads are used for performing bidirectional pressing on pre.
The die frame connecting rod assembly is used for being fixedly connected with a male die pressure head or a female die pressure head which respectively correspond to the male die pressure head or the female die pressure head, the die frame connecting rod assembly is of a specific structure which comprises a longitudinal connecting rod and branch rods, each branch rod penetrates through the vacuum cavity and is fixedly connected with the male die pressure head or the female die pressure head in the corresponding female die cavity, and the other side of the longitudinal connecting rod is fixedly connected with a hydraulic cylinder mounting plate through a horizontal connecting rod. In order to realize sealing performance, a friction-resistant sealing ring and an oil seal are arranged at the joint of each branch rod and the vacuum cavity, and a water-cooling interlayer is arranged in the vacuum cavity to prevent the branch rods from deforming and sealing failure caused by high temperature.
Furthermore, a group of male die pressing heads and female die pressing heads are symmetrically arranged in each female die cavity, the male die pressing heads, the female die pressing heads and the female die cavities are coaxially arranged, reasonable die cavity gaps are reserved between the outer walls of the male die pressing heads and the female die pressing heads and the inner walls of the female die cavities, the die cavity gaps are arranged, prepressing isotropic blanks in the pressing process can be conveniently deformed and extruded to the peripheral die cavity gaps, anisotropy is generated by automatic thermo-rheological orientation in the extrusion deformation flowing process, and only isotropic magnetic rings can be prepared if the die cavity gaps are too large. The specific size of the gap is determined by the wall thickness of the hot-pressing magnetic ring, and the gap can be larger when the hot-pressing isotropic magnetic ring is used for hot-pressing; the hot-pressing anisotropic magnet ring is used for hot-pressing anisotropic magnet rings, the gap size is smaller, and incomplete orientation of extrusion deformation and thermo-rheological is prevented.
The working principle of the utility model is that the hot-pressed Nd-Fe-B permanent magnetic material is prepared by hot-pressing or thermal rheological process, firstly, according to a certain component proportion, a fast quenching method is adopted to prepare a rare earth permanent magnetic fast quenching belt, then the rare earth permanent magnetic fast quenching belt is crushed into fast quenching Nd-Fe-B magnetic powder with a certain granularity, and then the fast quenching Nd-Fe-B magnetic powder is pressed into a columnar green body under the protection of inert gas, and the product is an isotropic magnet; under the protection of inert gas, a side pressure head with large mold taper is taken out of a mold cavity, a columnar green body is placed in a hot-pressing mold, then the side pressure head is controlled to enter the mold cavity, then the mold cavity is vacuumized to 0.1Pa, the temperature of the green body is increased to 700 and 900 ℃ through heating of a high-purity graphite electrode, the left pressure head and the right pressure head are driven to pressurize through a servo hydraulic driving mechanism when the temperature is increased to 700 ℃, the isotropic magnet green body is subjected to thermal extrusion deformation and rheological generation to generate anisotropy, the anisotropic magnetic ring is taken out after cooling and demolding, at the moment, a thin layer of joint is arranged at the opposite-pressing part of the left pressure head and the right pressure head in the middle of an inner. And finally, machining and magnetizing (magnetizing) the isotropic magnet blank or the anisotropic magnet blank to obtain the final isotropic magnetic or anisotropic hot-pressed neodymium iron boron permanent magnet material.
Claims (8)
1. The utility model provides a hot press unit for preparing tombarthite permanent magnet ring in batches, its characterized in that includes vacuum cavity (1), be provided with a plurality of bed die cavitys (2) side by side in vacuum cavity (1), all be provided with high-purity graphite electrode (3) between the outer wall of each bed die cavity (2) and adjacent bed die cavity (2), the symmetry is provided with multiunit terrace die pressure head (4) and die pressure head (5) in vacuum cavity (1), terrace die pressure head (4) and die pressure head (5) are controlled by servo hydraulic drive mechanism.
2. The hot press apparatus for batch production of rare earth permanent magnet rings according to claim 1, wherein a set of male press ram (4) and female press ram (5) are symmetrically disposed in each female die cavity (2), and a die cavity gap (6) is left between the outer walls of the male press ram (4) and the female press ram (5) and the inner wall of the female die cavity (2) where the male press ram (4) and the female press ram (5) are disposed.
3. The hot pressing apparatus for batch preparation of rare earth permanent magnet rings according to claim 2, wherein the vacuum chamber (1) is provided with a vacuum pump connection port (7) connected to a vacuum pump set.
4. The hot press apparatus according to claim 1, wherein the servo driving mechanism comprises a male die driving mechanism and a female die driving mechanism respectively arranged at two sides of the vacuum chamber (1), the male die driving mechanism and the female die driving mechanism are both composed of a hydraulic cylinder (8) and a die carrier connecting rod assembly, and the die carrier connecting rod assembly is used for being fixedly connected with the male die pressing head (4) or the female die pressing head (5) respectively corresponding to the male die driving mechanism and the female die driving mechanism.
5. The hot pressing device for batch preparation of rare earth permanent magnet rings according to claim 4, wherein the die frame connecting rod assembly comprises a longitudinal connecting rod (9) and a branch rod (10) which are integrally arranged, the branch rod (10) penetrates through the vacuum cavity (1) and then is fixedly connected with a male die pressing head (4) or a female die pressing head (5) in a corresponding female die cavity (2), and the other side of the longitudinal connecting rod (9) is fixedly connected with a hydraulic cylinder mounting plate (12) through a horizontal connecting rod (11).
6. The hot press apparatus for batch production of rare earth permanent magnet rings according to claim 1, wherein each female die cavity (2) is hollow cylindrical, the cross sections of the male (4) and female (5) die indenters are circular, and the female die is provided with a taper of not more than 0.5 ° to facilitate demolding.
7. The hot press apparatus for batch production of rare earth permanent magnet rings according to claim 1, wherein the punch press head (4), the die press head (5) and the female die cavity (2) are coaxially arranged.
8. The hot press apparatus for batch production of rare earth permanent magnet rings according to claim 5, wherein the joint of the branch rod (10) and the vacuum chamber (1) is provided with a friction-resistant seal ring and an oil seal, and a water-cooled interlayer is provided inside the vacuum chamber.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021159564.7U CN212625163U (en) | 2020-06-22 | 2020-06-22 | Hot-pressing device for batch preparation of rare earth permanent magnet rings |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021159564.7U CN212625163U (en) | 2020-06-22 | 2020-06-22 | Hot-pressing device for batch preparation of rare earth permanent magnet rings |
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| CN212625163U true CN212625163U (en) | 2021-02-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114334418A (en) * | 2021-12-29 | 2022-04-12 | 钢铁研究总院 | Combined type extrusion forming device and method suitable for neodymium iron boron permanent magnet ring |
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2020
- 2020-06-22 CN CN202021159564.7U patent/CN212625163U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114334418A (en) * | 2021-12-29 | 2022-04-12 | 钢铁研究总院 | Combined type extrusion forming device and method suitable for neodymium iron boron permanent magnet ring |
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