Servo electric cylinder and servo electric cylinder magnetic field press

Abstract

The utility model discloses a servo electric cylinder which 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 utility model 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 die 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 utility model belongs to the field of advanced equipment, especially relates to a servo electric cylinder and servo electric cylinder magnetic field press can be used for manufacturing rare earth permanent magnetic material. BACKGROUND

[0002] The rare earth permanent magnetic material mainly taking sintered neodymium iron boron is more and more applied with excellent magnetic performance, is widely used in medical nuclear magnetic resonance imaging, computer hard drive, sound, mobile phone etc.;With the requirement of energy saving and low carbon economy, the rare earth permanent magnetic material also begins to be widely applied in the field such as automobile parts, air conditioner compressor, energy saving and control motor, hybrid electric vehicle, wind power generation.

[0003] The industrialization preparation of rare earth permanent magnetic material generally adopts powder metallurgy technology, rare earth permanent magnetic alloy is made into 3-5um powder, is oriented forming under magnetic field, after taking out, carries out sealing packaging, isostatic pressing, removes package and carries out vacuum sintering, obtains rare earth permanent magnetic sintering blank, i.e. rare earth permanent magnetic material. The magnetic field press adopted in the industry is mostly hydraulic magnetic field press, needs to be equipped with hydraulic station and hydraulic cylinder for the magnetic field press, the equipment is relatively complex, can bring the problem of hydraulic oil pollution environment, in addition, the forming precision of hydraulic magnetic field press is difficult to control, is difficult to meet the production demand of the product with high precision requirement to the compact size. SUMMARY

[0004] In order to solve the above problem, the utility model provides a servo electric cylinder and servo electric cylinder magnetic field press, is used for making high-quality rare earth permanent magnetic forming body, and can be matched with highly automated, intelligent rare earth permanent magnetic production line.

[0005] The utility model provides a kind of servo electric cylinder, including motor end cover, motor shell, motor stator, motor rotor, motor support cover, angular contact bearing, radial bearing, ball screw, screw nut, linear guide rail, guide rail slider, electric cylinder supporting seat and electric cylinder cylinder rod.Motor end cover is connected with motor shell, motor shell is connected with motor support cover, motor rotor is arranged in the inside of motor stator, and motor stator is arranged in motor shell;Ball screw includes screw portion and installation portion in length direction;Screw nut is installed on screw portion, and rotates with ball screw;Screw nut reciprocates on screw portion;Angular contact bearing, motor rotor and radial bearing are sequentially installed on installation portion;Angular contact bearing is arranged in the central hole of motor support cover, and radial bearing is arranged in the central hole of motor end cover;Motor rotor and ball screw are assembled into an organic whole;Motor rotor drives ball screw to rotate under the support of angular contact bearing and radial bearing;The radial force of motor rotor and ball screw is borne by the angular contact bearing and radial bearing of the both ends of motor rotor;Ball screw is supported on motor support cover by angular contact bearing, and the axial force of ball screw is transmitted to motor support cover by angular contact bearing;Motor support cover is connected with electric cylinder supporting seat, and linear guide rail is arranged on electric cylinder supporting seat;Guide rail slider is installed on linear guide rail and can slide on linear guide rail;Screw nut is connected with guide rail slider;Electric cylinder cylinder rod is hollow and is sleeved on screw nut;When ball screw rotates, screw nut, guide rail slider and electric cylinder cylinder rod form linear pair;The axial force transmitted by electric cylinder cylinder rod is in the range of 10-2000kN.In a more preferred embodiment, the axial force transmitted by electric cylinder cylinder rod is in the range of 300-900kN.

[0006] Linear guide rail has 2, and each linear guide rail has at least one guide rail slider.

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

[0008] The motor shell has a double-layer structure, flanges are arranged at both ends, and cooling water passes through the middle of the double-layer structure.

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

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

[0011] The utility model discloses still provide a kind of servo cylinder magnetic field press, including press frame, press support frame, storage device, powder box, green compact conveying device, upper punch assembly, lower punch assembly, mould device, orientation magnetic pole and the aforementioned servo cylinder;Upper punch assembly, lower punch assembly, mould device and orientation magnetic pole are arranged in press frame;Servo cylinder has 2, respectively arranged above and below press frame, and the cylinder support seat of servo cylinder is connected with press frame;The cylinder stem of 2 servo cylinders is connected with upper punch assembly and lower punch assembly respectively by passing through press frame;Storage device is connected with powder box, and powder box is connected with the rear side of press frame, and green compact conveying device is connected with the front side of press frame, and orientation magnetic pole is arranged in the both sides of mould device;Upper punch assembly and lower punch assembly are respectively arranged above and below mould device;Press frame is supported on press support frame.

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

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

[0014] In an embodiment of the utility model, bidirectional pressing pressure of servo cylinder magnetic field press is in the range of 200-1000kN;The pressing speed of upper punch assembly and lower punch assembly is controllable in the range of 0-100mm / s;The same direction demoulding speed of upper punch assembly and lower punch assembly is controllable in the range of 0-100mm / s.

[0015] In an embodiment of the utility model, bidirectional pressing pressure of servo cylinder magnetic field press is in the range of 400-800kN;The pressing speed of upper punch assembly and lower punch assembly is controllable in the range of 0-80mm / s;The same direction demoulding speed of upper punch assembly and lower punch assembly is controllable in the range of 0-80mm / s.

[0016] Upper punch assembly and lower punch assembly can move according to set program curve, and moving precision is higher than 0.05mm, pressure precision is higher than 0.1MPa, and the size precision of green compact is higher than 0.05mm;Servo cylinder magnetic field press can bidirectional pressing and protection demoulding according to set process curve.

[0017] Press support frame includes roller and moving mechanism;Moving mechanism drives press frame to move relative to green compact conveying device;Press frame can also move relative to powder box.

[0018] After the alloy powder is loaded into the mold device, the mold device is subjected to magnetic field orientation, after the orientation current reaches a set value, the upper compression head assembly is lowered according to a set first speed curve, and stops lowering when a first set pressure is reached; the lower compression head assembly is raised according to a set second speed curve, and stops raising when a second set pressure is reached, realizing bidirectional compression; after the mold device is demagnetized, the upper compression head assembly is raised according to a set third speed curve, and rapidly raises when a set first position is reached; the lower compression head assembly is raised according to a set fourth speed curve, and stops raising when a set second position is reached.

[0019] The density of the compact made by the servo cylinder magnetic field press is greater than or equal to 4.1 g / cm 3 .

[0020] After the alloy powder is loaded into the mold device, the mold device is subjected to magnetic field orientation, after the orientation current reaches a set value, the upper compression head assembly is lowered according to a set first speed; the lower compression head assembly is raised according to a set second speed, and when the first speed and the second speed are both not higher than 50 mm / s, the height size precision of the compact is higher than 0.02 mm.

[0021] The servo cylinder magnetic field press cancels the hydraulic station and the hydraulic cylinder, the equipment is significantly simplified, and the problem of hydraulic oil polluting the environment is avoided. In addition, the servo cylinder magnetic field press cancels a series of steps of motor-hydraulic pump-hydraulic valve-hydraulic cylinder-overflow, energy consumption is significantly reduced, and compared with the same specification magnetic field forming press, the design power is reduced by more than 20%. The magnetic field forming precision of the servo cylinder magnetic field press is significantly improved, the size precision of the formed compact can be controlled to be higher than 0.02 mm, and the pressure precision is less than or equal to 0.1 MPa, so that the production of some one-press forming rare earth permanent magnet device products can be met, the production efficiency is improved, the processing loss of the rare earth permanent magnet material is reduced, and the use of rare earth resources is saved.

[0022] The servo cylinder and the ball screw are integrally designed, the ball screw and the spindle of the servo cylinder are designed as a whole, the structure of the cylinder is simplified, the reliability is improved, the toothed belt and other vulnerable parts are cancelled, the height is reduced, and the servo cylinder is more suitable for application in the magnetic field press.

[0023] The servo cylinder structure is specially designed, low-power high-speed work can be realized, low-speed high-power work can be realized, and the requirements of high-speed feeding and low-speed orientation forming of the magnetic field forming technology are met. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a structural schematic diagram of one embodiment of the servo cylinder of the utility model.

[0025] Figure 2is a structural schematic view of one embodiment of the servo electric cylinder magnetic field press of the utility model. DETAILED DESCRIPTION

[0026] As Figure 1 shown in the utility model, the servo electric cylinder 01 includes a motor end cover 1, a motor shell 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 rail 10, a guide rail slider 11, an electric cylinder support seat 12 and an electric cylinder cylinder rod 13. The motor end cover 1 is connected with the motor shell 2, the motor shell 2 is connected with 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 shell 2. The ball screw 8 includes a screw part and a mounting part in the length direction; the screw nut 9 is mounted 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 sequentially mounted on the mounting part; the angular contact bearing 6 is arranged in the central hole of the motor support cover 5, and the radial bearing 7 is arranged in the central 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 with the electric cylinder support seat 12, and the linear guide rail 10 is arranged on the electric cylinder support seat 12; the guide rail slider 11 is mounted on the linear guide rail 10 and can slide on the linear guide rail 10; the screw nut 9 is connected with the guide rail slider 11; the electric cylinder cylinder rod 13 is hollow and is sleeved on the screw nut 9; when the ball screw 8 rotates, the screw nut 9, the guide rail slider 11 and the electric cylinder cylinder rod 13 form a linear motion pair.

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

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

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

[0031] The motor shell has a double-layer structure, flanges are arranged at both ends, and cooling water passes through the middle of the double-layer structure.

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

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

[0034] As shown in Figure 2 The servo electric cylinder magnetic field press comprises a press frame 14, a press support frame 15, a storage device 16, a powder loading box 17, a green compact 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; the servo electric cylinder 01 is provided with two servo electric cylinders, which are arranged above and below the press frame 14 respectively, and the electric cylinder supporting seat 12 of the servo electric cylinder is connected with the press frame 14.

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

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

[0037] The powder loading 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 loading 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 10-2000 kN; the pressing speed of the upper press head assembly and the lower press head assembly is controllable in the range of 0-200 mm / s; and the same direction demolding speed of the upper press head assembly and the lower press head assembly is controllable in the range of 0-200 mm / s.

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

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

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

[0042] The press support frame 15 comprises a roller 23 and a moving mechanism; the moving mechanism drives the press frame 14 to move relative to the pressed blank conveying device 18; and the press frame 14 can also move relative to the powder loading box 17.

[0043] After the alloy powder is loaded into the mold device, the mold device is subjected to magnetic field orientation; after the orientation current reaches the set value, the upper pressing head assembly descends according to the set first speed curve, stops descending when the first set pressure is reached; the lower pressing head assembly ascends according to the set second speed curve, stops ascending when the second set pressure is reached, and bidirectional pressing is realized; after the mold device is demagnetized, the upper pressing head assembly ascends according to the set third speed curve, rapidly ascends when the set first position is reached; and the lower pressing head assembly ascends according to the set fourth speed curve, stops ascending when the set second position is reached.

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

[0045] After the alloy powder is loaded into the mold device, the mold device is subjected to magnetic field orientation; after the orientation current reaches the set value, the upper pressing head assembly descends according to the set first speed; the lower pressing head assembly ascends according to the set second speed; when the first speed and the second speed are both not higher than 50mm / s, the height size precision of the pressed blank is higher than 0.02mm.

Claims

1. A servo cylinder characterized by: The servo motor includes a motor end cover, a motor shell, 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 rail, a guide rail slider, a cylinder support seat and a cylinder rod.

2. The servo cylinder according to claim 1, characterized in that: The motor end cover is connected with the motor shell, the motor shell is connected with 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 shell.

3. The servo cylinder of claim 1, wherein: The ball screw includes a screw part and a mounting part in the length direction.

4. The servo cylinder of claim 1, wherein: The screw nut is mounted on the screw part and rotates with the ball screw.

5. The servo cylinder of claim 1, wherein: The screw nut reciprocates on the screw part.

6. The servo cylinder of claim 5, wherein: The angular contact bearing, the motor rotor and the radial bearing are sequentially mounted on the mounting part.

7. The servo cylinder of claim 1, wherein: The angular contact bearing is arranged in the central hole of the motor support cover, and the radial bearing is arranged in the central hole of the motor end cover.

8. The servo cylinder of claim 1, wherein: The motor rotor and the ball screw are assembled into one body. 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 bearing and the radial bearing at both ends of the motor rotor. The ball screw is supported on the motor support cover through the angular contact bearing, and the axial force of the ball screw is transmitted to the motor support cover by the angular contact bearing. The motor support cover is connected with the cylinder support seat, and the linear guide rail is arranged on the cylinder support seat. The guide rail slider is mounted on the linear guide rail and can slide on the linear guide rail. The screw nut is connected with the guide rail slider. The cylinder rod is hollow and is sleeved on the screw nut. When the ball screw rotates, the screw nut, the guide rail slider and the cylinder rod form a linear motion pair. The linear guide rail has two linear guide rails, and each linear guide rail has at least one guide rail slider. The servo cylinder includes a position sensor for indicating and controlling the position of the cylinder rod, and the display accuracy of the position sensor is higher than 0.5 mm. The motor shell has a double-layer structure, flanges are arranged at both ends, and cooling water passes through the middle of the double-layer structure. The motor stator has a multi-pole structure and can realize low-speed operation, and the rotating magnetic field speed is in the range of -100 r / min to +100 r / min. The motor rotor has a multi-pole structure with the same number of poles as the stator, and the motor rotor and the cylinder rod share the same rotation axis and can realize gapless connection and direct drive. The motor rotor has a permanent magnet structure, and the rotation speed of the motor rotor is synchronized with the rotating magnetic field speed of the motor stator. The axial force transmitted by the cylinder rod is in the range of 300-900 kN.

9. A servo cylinder magnetic field press, characterized by: The servo cylinder magnetic field press comprises a press frame, a press support frame, a material storage device, a powder loading box, a green compact conveying device, an upper punch assembly, a lower punch assembly, a die device, an orientation magnetic pole and the servo cylinder as claimed in any one of claims 1-8; the upper punch assembly, the lower punch assembly, the die device and the orientation magnetic pole are arranged in the press frame; the servo cylinder has two, which are arranged above and below the press frame respectively, and the cylinder support seat of the servo cylinder is connected with the press frame; the cylinder rods of the two servo cylinders pass through the press frame and are connected with the upper punch assembly and the lower punch assembly respectively; the material storage device is connected with the powder loading box, the powder loading box is connected with the rear side of the press frame, the green compact conveying device is connected with the front side of the press frame, and the orientation magnetic pole is arranged on both sides of the die device; the upper punch assembly and the lower punch assembly are arranged above and below the die device respectively; the press frame is supported on the press support frame.

10. The servo-hydraulic cylinder magnetic field press of claim 9, wherein: The powder loading 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 loading box and the press frame can move relative to the green compact conveying device.

11. The servo-hydraulic cylinder magnetic field press of claim 9, wherein: The bidirectional pressing force of the servo cylinder magnetic field press is in the range of 10-2000 kN; the pressing speed of the upper punch assembly and the lower punch assembly is controllable in the range of 0-200 mm / s; and the ejection speed of the upper punch assembly and the lower punch assembly is controllable in the range of 0-200 mm / s.

12. The servo-hydraulic cylinder magnetic field press of claim 9, wherein: The upper punch assembly and the lower punch assembly can move according to the set program curve, the moving precision is higher than 0.05 mm, and the pressure precision is higher than 0.1 MPa; the servo cylinder magnetic field press can perform bidirectional pressing and protective ejection according to the set process curve.

13. The servo-hydraulic cylinder magnetic field press of claim 9, wherein: The press support frame comprises rollers and a moving mechanism; the moving mechanism drives the press frame to move relative to the green compact conveying device; and the press frame can also move relative to the powder loading box.

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