Servo electric cylinder and servo electric cylinder magnetic field press

Abstract

The servo electric cylinder comprises a motor end cover, a motor shell, a motor stator, a motor rotor, a motor supporting cover, an angular contact bearing, a radial bearing, a ball screw, a screw nut, a linear guide rail, a guide rail sliding block, an electric cylinder supporting seat and an electric cylinder rod. The motor end cover is connected with the motor shell; the motor shell is connected with the motor supporting cover; the lead screw nut is installed on the ball screw, rotates along with the ball screw and reciprocates on the ball screw. And the angular contact bearing, the motor rotor and the radial bearing are sequentially mounted on the mounting part. When the ball screw rotates, the screw nut, the guide rail sliding block and the electric cylinder rod form a linear motion pair. The invention further discloses a servo electric cylinder magnetic field pressing machine which comprises a pressing machine frame, an upper pressing head assembly, a lower pressing head assembly, a mold device and two servo electric cylinders. An electric cylinder supporting seat of the servo electric cylinder is connected with the press frame; a cylinder rod of the electric cylinder penetrates through the press frame to be connected with the upper pressing head assembly and the lower pressing head assembly.

Description

Technical Field

[0001] The invention belongs to the field of advanced equipment, and in particular relates to a servo electric cylinder and a servo electric cylinder magnetic field press, which can be used to manufacture rare earth permanent magnetic materials. Background Art

[0002] Rare earth permanent magnet materials, mainly sintered NdFeB, are increasingly being used due to their excellent magnetic properties. They are widely used in medical MRI, computer hard disk drives, audio, mobile phones, etc.; with the requirements of energy conservation and low-carbon economy, rare earth permanent magnet materials have begun to be widely used in automotive parts, air-conditioning compressors, energy-saving and control motors, hybrid vehicles, wind power generation and other fields.

[0003] The industrial preparation of rare earth permanent magnet materials generally adopts powder metallurgy technology, which makes rare earth permanent magnet alloy into 3-5um powder, forms it under magnetic field orientation, seals it and packages it, presses it isostatically, removes the packaging and then vacuum sinters it to obtain rare earth permanent magnet sintered blank, i.e. rare earth permanent magnet material. At present, most of the magnetic field presses used in the industry are hydraulic magnetic field presses, which need to be equipped with hydraulic stations and hydraulic cylinders. The equipment is relatively complex and will cause the problem of hydraulic oil polluting the environment. In addition, the forming accuracy of hydraulic magnetic field presses is difficult to control, and it is difficult to meet the production needs of products with high requirements for the size accuracy of the pressed blanks. Summary of the invention

[0004] In order to solve the above problems, the present invention proposes a servo electric cylinder and a servo electric cylinder magnetic field press, which are used to produce high-quality rare earth permanent magnet formed bodies and can be matched with a highly automated and intelligent rare earth permanent magnet production line.

[0005] The present invention provides a servo electric cylinder, comprising a motor end cover, a motor housing, a motor stator, a motor rotor, a motor support cover, an angular contact bearing, a radial bearing, a ball screw, a screw nut, a linear guide, a guide slider, an electric cylinder support seat and an electric cylinder rod. The motor end cover is connected to the motor housing, the motor housing is connected to the motor support cover, the motor rotor is arranged on the inner side of the motor stator, and the motor stator is arranged in the motor housing; the ball screw includes a screw part and a mounting part in the length direction; the screw nut is installed on the screw part and rotates with the ball screw; the screw nut reciprocates on the screw part; the angular contact bearing, the motor rotor and the radial bearing are sequentially installed on the mounting part; the angular contact bearing is arranged in the center hole of the motor support cover, and the radial bearing is arranged in the center hole of the motor end cover; the motor rotor and the ball screw are assembled into one; the motor rotor drives the ball screw to rotate under the support of the angular contact bearing and the radial bearing; The radial force of the motor rotor and the ball screw is borne by the angular contact bearings and the radial bearings at both ends of the motor rotor; the ball screw is supported on the motor support cover through the angular contact bearings, and the axial force of the ball screw is transmitted to the motor support cover by the angular contact bearings; the motor support cover is connected to the electric cylinder support seat, and the linear guide is arranged on the electric cylinder support seat; the guide slider is installed on the linear guide and can slide on the linear guide; the screw nut is connected to the guide slider; the electric cylinder rod is hollow and is mounted on the screw nut; when the ball screw rotates, the screw nut, the guide slider and the electric cylinder rod form a linear motion pair; the axial force transmitted by the electric cylinder rod is in the range of 10-2000kN. In a more preferred embodiment, the axial force transmitted by the electric cylinder rod is in the range of 300-900kN.

[0006] There are two linear guides, and each linear guide has at least one guide slider.

[0007] The servo electric cylinder includes a position sensor for indicating and controlling the position of the electric cylinder rod, and the display accuracy of the position sensor is higher than 0.5 mm. In a preferred embodiment, the display accuracy of the position sensor is higher than 0.01 mm.

[0008] The motor housing is a double-layer structure with flanges at both ends, and cooling water flows in the middle of the double-layer structure.

[0009] The motor stator is a multi-pole structure, which can achieve low-speed operation, and the rotating magnetic field speed is in the range of -100r / min to +100r / min. The motor rotor is a multi-pole structure with the same number of poles as the stator. The motor rotor and the electric cylinder rod share the same rotating shaft, which can achieve gapless connection and direct drive.

[0010] The motor rotor is a permanent magnet structure, and the speed of the motor rotor is synchronized with the speed of the rotating magnetic field of the motor stator.

[0011] The present invention also provides a servo electric cylinder magnetic field press, comprising a press frame, a press support frame, a material storage device, a powder box, a blank conveying device, an upper press head assembly, a lower press head assembly, a mold device, an orientation magnetic pole and the aforementioned servo electric cylinder; the upper press head assembly, the lower press head assembly, the mold device and the orientation magnetic pole are arranged in the press frame; there are two servo electric cylinders, which are respectively arranged above and below the press frame, and the electric cylinder support seats of the servo electric cylinders are connected to the press frame; the electric cylinder rods of the two servo electric cylinders pass through the press frame and are respectively connected to the upper press head assembly and the lower press head assembly; the material storage device is connected to the powder box, the powder box is connected to the rear side of the press frame, the blank conveying device is connected to the front side of the press frame, and the orientation magnetic poles are arranged on both sides of the mold device; the upper press head assembly and the lower press head assembly are respectively arranged above and below the mold device; the press frame is supported on the press support frame.

[0012] The powder box, the press frame and the green compact conveying device form a sealed body isolated from the atmosphere; the green compact conveying device is fixed, and the powder box and the press frame can move relative to the green compact conveying device.

[0013] The bidirectional pressing pressure of the servo electric cylinder magnetic field press is in the range of 10-2000kN; the pressing speed of the upper pressure head assembly and the lower pressure head assembly is controllable in the range of 0-200mm / s; the same-direction demoulding speed of the upper pressure head assembly and the lower pressure head assembly is controllable in the range of 0-200mm / s.

[0014] In one embodiment of the present invention, the bidirectional pressing pressure of the servo electric cylinder magnetic field press is in the range of 200-1000kN; the pressing speed of the upper press head assembly and the lower press head assembly is controllable in the range of 0-100mm / s; the same-direction demolding speed of the upper press head assembly and the lower press head assembly is controllable in the range of 0-100mm / s.

[0015] In one embodiment of the present invention, the bidirectional pressing pressure of the servo electric cylinder magnetic field press is in the range of 400-800kN; the pressing speed of the upper press head assembly and the lower press head assembly is controllable in the range of 0-80mm / s; the same-direction demolding speed of the upper press head assembly and the lower press head assembly is controllable in the range of 0-80mm / s.

[0016] The upper and lower pressure head assemblies can move according to the set program curve, with movement accuracy higher than 0.05mm, pressure accuracy higher than 0.1MPa, and size accuracy of the pressed blank higher than 0.05mm; the servo electric cylinder magnetic field press can perform bidirectional pressing and protective demolding according to the set process curve.

[0017] The press support frame includes rollers and a moving mechanism; the moving mechanism drives the press frame to move relative to the compact conveying device; the press frame can also move relative to the powder box.

[0018] After the alloy powder is loaded into the mold device, the mold device is oriented in the magnetic field. After the orientation current reaches the set value, the upper pressure head assembly descends according to the set first speed curve, and stops descending when the first set pressure is reached; the lower pressure head assembly ascends according to the set second speed curve, and stops ascending when the second set pressure is reached, thereby realizing two-way pressure; after the mold device is demagnetized, the upper pressure head assembly ascends according to the set third speed curve, and ascends rapidly when it reaches the set first position; the lower pressure head assembly ascends according to the set fourth speed curve, and stops ascending when it reaches the set second position.

[0019] The density of the compact made by the servo electric cylinder magnetic field press is ≥4.1g / cm 3 .

[0020] After the alloy powder is loaded into the mold device, the mold device is oriented in the magnetic field. After the orientation current reaches the set value, the upper pressure head assembly descends at the set first speed; the lower pressure head assembly ascends at the set second speed. When the first speed and the second speed are both not higher than 50mm / s, the height dimensional accuracy of the pressed billet is higher than 0.02mm.

[0021] The servo electric cylinder magnetic field press of the present invention eliminates the hydraulic station and the hydraulic cylinder, and the equipment is significantly simplified, avoiding the problem of hydraulic oil polluting the environment. In addition, the servo electric cylinder magnetic field press of the present invention eliminates a series of steps such as motor-hydraulic pump-hydraulic valve-hydraulic cylinder-overflow, and the energy consumption is significantly reduced. Compared with the magnetic field forming press of the same specification, the design power is reduced by more than 20%. The magnetic field forming accuracy of the servo electric cylinder magnetic field press of the present invention is significantly improved, and the dimensional accuracy of the formed blank can be controlled to be higher than 0.02mm, and the pressure accuracy is ≤0.1MPa, which can meet the production of certain rare earth permanent magnet device products that are pressed and formed once, improve production efficiency, reduce the processing loss of rare earth permanent magnet materials, and save the use of rare earth resources.

[0022] The servo electric cylinder of the present invention is designed as an integrated whole with the ball screw. The ball screw and the main shaft of the servo electric cylinder are designed as one, which simplifies the structure of the electric cylinder, improves reliability, eliminates wearing parts such as toothed belts, reduces height, and makes the servo electric cylinder more suitable for use in magnetic field presses.

[0023] The present invention adopts a specially designed servo electric cylinder structure, which can realize both low-power and high-speed operation and low-speed and high-power operation, and is particularly in line with the requirements of high-speed feeding and low-speed orientation forming of magnetic field forming technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of an implementation mode of the servo electric cylinder of the present invention.

[0025] Figure 2 It is a structural schematic diagram of an implementation mode of the servo electric cylinder magnetic field press of the present invention. DETAILED DESCRIPTION

[0026] like Figure 1 As shown, the servo electric cylinder 01 in the present invention includes a motor end cover 1, a motor housing 2, a motor stator 3, a motor rotor 4, a motor support cover 5, an angular contact bearing 6, a radial bearing 7, a ball screw 8, a screw nut 9, a linear guide 10, a guide slider 11, an electric cylinder support seat 12 and an electric cylinder rod 13. The motor end cover 1 is connected to the motor housing 2, the motor housing 2 is connected to the motor support cover 5, the motor rotor 4 is arranged on the inner side of the motor stator 3, and the motor stator 3 is arranged in the motor housing 2. The ball screw 8 includes a screw part and a mounting part in the length direction; the screw nut 9 is installed on the screw part and rotates with the ball screw 8; the screw nut 9 reciprocates on the screw part; the angular contact bearing 6, the motor rotor 4 and the radial bearing 7 are installed on the mounting part in sequence; the angular contact bearing 6 is arranged in the center hole of the motor support cover 5, and the radial bearing 7 is arranged in the center hole of the motor end cover 1; the motor rotor 4 and the ball screw 8 are assembled into one body; the motor rotor 4 drives the ball screw 8 to rotate under the support of the angular contact bearing 6 and the radial bearing 7; the radial force of the motor rotor 4 and the ball screw 8 is borne by the angular contact bearing 6 and the radial bearing 7 at both ends of the motor rotor; the ball screw 8 is supported on the motor support cover 5 through the angular contact bearing 6, and the axial force of the ball screw 8 is transmitted to the motor support cover 5 by the angular contact bearing 6.

[0027] The motor support cover 5 is connected to the electric cylinder support seat 12, and the linear guide 10 is set on the electric cylinder support seat 12; the guide slider 11 is installed on the linear guide 10 and can slide on the linear guide 10; the screw nut 9 is connected to the guide slider 11; the electric cylinder rod 13 is hollow and is mounted on the screw nut 9; when the ball screw 8 rotates, the screw nut 9, the guide slider 11 and the electric cylinder rod 13 form a linear motion pair.

[0028] The axial force transmitted by the electric cylinder rod is in the range of 10-2000 kN. In a more preferred embodiment, the axial force transmitted by the electric cylinder rod is in the range of 300-900 kN.

[0029] There are two linear guides, and each linear guide has at least one guide slider.

[0030] The servo electric cylinder includes a position sensor for indicating and controlling the position of the electric cylinder rod, and the display accuracy of the position sensor is higher than 0.5 mm. In a preferred embodiment, the display accuracy of the position sensor is higher than 0.01 mm.

[0031] The motor housing is a double-layer structure with flanges at both ends, and cooling water flows in the middle of the double-layer structure.

[0032] The motor stator is a multi-pole structure, which can achieve low-speed operation, and the rotating magnetic field speed is in the range of -100r / min to +100r / min. The motor rotor is a multi-pole structure with the same number of poles as the stator. The motor rotor and the electric cylinder rod share the same rotating shaft, which can achieve gapless connection and direct drive.

[0033] The motor rotor is a permanent magnet structure, and the speed of the motor rotor is synchronized with the speed of the rotating magnetic field of the motor stator.

[0034] like Figure 2 As shown, the servo electric cylinder magnetic field press in the present invention includes a press frame 14, a press support frame 15, a material storage device 16, a powder box 17, a blank conveying device 18, an upper press head assembly 19, a lower press head assembly 20, a mold device 21, an orientation magnetic pole 22 and the aforementioned servo electric cylinder 01; the upper press head assembly 19, the lower press head assembly 20, the mold device 21 and the orientation magnetic pole 22 are arranged in the press frame 14; there are two servo electric cylinders 01, which are respectively arranged above and below the press frame 14, and the electric cylinder support seat 12 of the servo electric cylinder is connected to the press frame 14.

[0035] The electric cylinder rod of the servo electric cylinder passes through the press frame and is respectively connected with the upper press head assembly and the lower press head assembly.

[0036] The material storage device 16 is connected to the powder box 17, the powder box 17 is connected to the rear side of the press frame 14, the blank conveying device 18 is connected to the front side of the press frame 14, and the orientation magnetic poles 22 are arranged on both sides of the mold device 21; the upper press head assembly 19 and the lower press head assembly 20 are respectively arranged above and below the mold device 21; the press frame 14 is supported on the press support frame 15.

[0037] The powder box, the press frame and the green compact conveying device form a sealed body isolated from the atmosphere; the green compact conveying device is fixed, and the powder box and the press frame can move relative to the green compact conveying device.

[0038] The bidirectional pressing pressure of the servo electric cylinder magnetic field press is in the range of 10-2000kN; the pressing speed of the upper pressure head assembly and the lower pressure head assembly is controllable in the range of 0-200mm / s; the same-direction demoulding speed of the upper pressure head assembly and the lower pressure head assembly is controllable in the range of 0-200mm / s.

[0039] In one embodiment of the present invention, the bidirectional pressing pressure of the servo electric cylinder magnetic field press is in the range of 200-1000kN; the pressing speed of the upper press head assembly and the lower press head assembly is controllable in the range of 0-100mm / s; the same-direction demolding speed of the upper press head assembly and the lower press head assembly is controllable in the range of 0-100mm / s.

[0040] In one embodiment of the present invention, the bidirectional pressing pressure of the servo electric cylinder magnetic field press is in the range of 400-800kN; the pressing speed of the upper press head assembly and the lower press head assembly is controllable in the range of 0-80mm / s; the same-direction demolding speed of the upper press head assembly and the lower press head assembly is controllable in the range of 0-80mm / s.

[0041] The upper and lower pressure head assemblies can move according to the set program curve, with movement accuracy higher than 0.05mm, pressure accuracy higher than 0.1MPa, and size accuracy of the pressed blank higher than 0.05mm; the servo electric cylinder magnetic field press can perform bidirectional pressing and protective demolding according to the set process curve.

[0042] The press support frame 15 includes rollers 23 and a moving mechanism; the moving mechanism drives the press frame 14 to move relative to the compact conveying device 18; the press frame 14 can also move relative to the powder box 17.

[0043] After the alloy powder is loaded into the mold device, the mold device is oriented in the magnetic field. After the orientation current reaches the set value, the upper pressure head assembly descends according to the set first speed curve, and stops descending when the first set pressure is reached; the lower pressure head assembly ascends according to the set second speed curve, and stops ascending when the second set pressure is reached, thereby realizing two-way pressure; after the mold device is demagnetized, the upper pressure head assembly ascends according to the set third speed curve, and ascends rapidly when it reaches the set first position; the lower pressure head assembly ascends according to the set fourth speed curve, and stops ascending when it reaches the set second position.

[0044] The density of the compact made by the servo electric cylinder magnetic field press is ≥4.1g / cm 3 .

[0045] After the alloy powder is loaded into the mold device, the mold device is oriented in the magnetic field. After the orientation current reaches the set value, the upper pressure head assembly descends at the set first speed; the lower pressure head assembly ascends at the set second speed. When the first speed and the second speed are both not higher than 50mm / s, the height dimensional accuracy of the pressed billet is higher than 0.02mm.

Claims

1. A servo electric cylinder, characterized in that: It includes a motor end cover, a motor housing, a motor stator, a motor rotor, a motor support cover, an angular contact bearing, a radial bearing, a ball screw, a screw nut, a linear guide, a guide slider, an electric cylinder support seat and an electric cylinder rod; the motor end cover is connected to the motor housing, the motor housing is connected to the motor support cover, the motor rotor is arranged on the inner side of the motor stator, and the motor stator is arranged in the motor housing; the ball screw includes a screw part and a mounting part in the length direction; the screw nut is installed on the screw part and rotates with the ball screw; the screw nut reciprocates on the screw part; the angular contact bearing, the motor rotor and the radial bearing are installed on the mounting part in sequence; the angular contact bearing is arranged in the center hole of the motor support cover, and the radial bearing is arranged in the center hole of the motor end cover; the motor rotor and the ball screw The motor and the electric cylinder are assembled into one piece; the motor rotor drives the ball screw to rotate with the support of the angular contact bearing and the radial bearing; the radial force of the motor rotor and the ball screw is borne by the angular contact bearings and the radial bearings at both ends of the motor rotor; the ball screw is supported on the motor support cover through the angular contact bearings, and the axial force of the ball screw is transmitted to the motor support cover by the angular contact bearings; the motor support cover is connected to the electric cylinder support seat, and the linear guide is arranged on the electric cylinder support seat; the guide slider is installed on the linear guide and can slide on the linear guide; the screw nut is connected to the guide slider; the electric cylinder rod is hollow and is mounted on the screw nut; when the ball screw rotates, the screw nut, the guide slider and the electric cylinder rod form a linear motion pair; the axial force transmitted by the electric cylinder rod is in the range of 10-2000kN.

2. The servo electric cylinder according to claim 1, characterized in that: There are two linear guide rails, and each linear guide rail has at least one guide rail slider.

3. The servo electric cylinder according to claim 1, characterized in that: The servo electric cylinder includes a position sensor for indicating and controlling the position of the electric cylinder rod. The display accuracy of the position sensor is higher than 0.5mm.

4. The servo electric cylinder according to claim 1, characterized in that: The servo electric cylinder includes a position sensor for indicating and controlling the position of the electric cylinder rod. The display accuracy of the position sensor is higher than 0.01mm.

5. The servo electric cylinder according to claim 1, characterized in that: The motor housing is a double-layer structure with flanges at both ends, and cooling water flows in the middle of the double-layer structure.

6. The servo electric cylinder according to claim 1, characterized in that: The motor stator has a multi-pole structure and can achieve low-speed operation. The rotating magnetic field speed is in the range of -100r / min to +100r / min.

7. The servo electric cylinder according to claim 6, characterized in that: The motor rotor is a multi-pole structure with the same number of poles as the stator. The motor rotor and the electric cylinder rod share a common rotating shaft, which can achieve gapless connection and direct drive.

8. The servo electric cylinder according to claim 1, characterized in that: The motor rotor is a permanent magnet structure, and the speed of the motor rotor is synchronized with the speed of the rotating magnetic field of the motor stator.

9. The servo electric cylinder according to claim 1, characterized in that: The axial force transmitted by the electric cylinder rod is in the range of 300-900kN.

10. A servo electric cylinder magnetic field press, characterized in that: It includes a press frame, a press support frame, a material storage device, a powder box, a blank conveying device, an upper press head assembly, a lower press head assembly, a mold device, an orientation magnetic pole and a servo electric cylinder as described in any one of claims 1 to 9; the upper press head assembly, the lower press head assembly, the mold device and the orientation magnetic pole are arranged in the press frame; there are two servo electric cylinders, which are respectively arranged above and below the press frame, and the cylinder support seats of the servo electric cylinders are connected to the press frame; the cylinder rods of the two servo electric cylinders pass through the press frame and are respectively connected to the upper press head assembly and the lower press head assembly; the material storage device is connected to the powder box, the powder box is connected to the rear side of the press frame, the blank conveying device is connected to the front side of the press frame, and the orientation magnetic poles are arranged on both sides of the mold device; the upper press head assembly and the lower press head assembly are respectively arranged above and below the mold device; the press frame is supported on the press support frame.

11. The servo electric cylinder magnetic field press according to claim 10, characterized in that: The powder box, the press frame and the green compact conveying device form a sealed body isolated from the atmosphere; the green compact conveying device is fixed, and the powder box and the press frame can move relative to the green compact conveying device.

12. The servo electric cylinder magnetic field press according to claim 10, characterized in that: The bidirectional pressing pressure of the servo electric cylinder magnetic field press is in the range of 10-2000kN; the pressing speed of the upper pressure head assembly and the lower pressure head assembly is controllable in the range of 0-200mm / s; the same-direction demoulding speed of the upper pressure head assembly and the lower pressure head assembly is controllable in the range of 0-200mm / s.

13. The servo electric cylinder magnetic field press according to claim 10, characterized in that: The bidirectional pressing pressure of the servo electric cylinder magnetic field press is in the range of 200-1000kN; the pressing speed of the upper and lower pressure head assemblies is controllable in the range of 0-100mm / s; the same-direction demoulding speed of the upper and lower pressure head assemblies is controllable in the range of 0-100mm / s.

14. The servo electric cylinder magnetic field press according to claim 10, characterized in that: The bidirectional pressing pressure of the servo electric cylinder magnetic field press is in the range of 400-800kN; the pressing speed of the upper and lower pressure head assemblies is controllable in the range of 0-80mm / s; the same-direction demoulding speed of the upper and lower pressure head assemblies is controllable in the range of 0-80mm / s.

15. The servo electric cylinder magnetic field press according to claim 10, characterized in that: The upper and lower pressure head assemblies can move according to the set program curve, with movement accuracy higher than 0.05mm, pressure accuracy higher than 0.1MPa, and size accuracy of the pressed blank higher than 0.05mm; the servo electric cylinder magnetic field press can perform bidirectional pressing and protective demolding according to the set process curve.

16. The servo electric cylinder magnetic field press according to claim 10, characterized in that: The press support frame includes rollers and a moving mechanism; the moving mechanism drives the press frame to move relative to the compact conveying device; the press frame can also move relative to the powder box.

17. The servo electric cylinder magnetic field press according to claim 10, characterized in that: After the alloy powder is loaded into the mold device, the mold device is oriented in the magnetic field. After the orientation current reaches the set value, the upper pressure head assembly descends according to the set first speed curve, and stops descending when the first set pressure is reached; the lower pressure head assembly ascends according to the set second speed curve, and stops ascending when the second set pressure is reached, thereby realizing two-way pressure; after the mold device is demagnetized, the upper pressure head assembly ascends according to the set third speed curve, and ascends rapidly when it reaches the set first position; the lower pressure head assembly ascends according to the set fourth speed curve, and stops ascending when it reaches the set second position.

18. The servo electric cylinder magnetic field press according to claim 10, characterized in that: The density of the compact made by the servo electric cylinder magnetic field press is ≥4.1g / cm 3 .

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