Pulse electromagnetic press

Abstract

This invention discloses a pulse electromagnetic press, characterized by replacing the rotary motor with an electromagnetic pulse motor and driving the slider with an elbow mechanism. The pulse motor utilizes a pre-compression spring to start the motor, improving energy conversion efficiency. The motor's static mover is positioned high in the housing. During output, the microcontroller releases the energy stored in the compression spring, enabling the mover to reach a set speed. This results in a very small magnetic pole distance. A speed sensor triggers a Schmitt trigger circuit to control an "electronic switch" that supplies pulse current to the motor windings. The mover experiences a powerful electromagnetic force, causing the transmission mechanism rollers to roll along a curved track. This changes the force applied to the workpiece by the slider. This invention enables the manufacture of large and ultra-large presses, replacing widely used high-energy-consuming presses and leading the manufacturing industry towards transformation, upgrading, and high-end development.

Description

Technical Field

[0001] This invention pertains to machine tool manufacturing, specifically a press driven by an electromagnetic pulse linear motor. Background Technology

[0002] Crank presses are widely used forging equipment. They utilize a crank-slider mechanism to convert rotary motion into linear reciprocating motion required for stamping via a crank-connecting rod mechanism. However, their drawbacks include power less than the maximum resistance of the load, inability to match the load, and the need for a flywheel mounted on the crankshaft to maintain continuous operation. When the slider encounters maximum resistance, the flywheel releases energy to complete the pressing. A textbook for higher education institutions, edited by He Deyu of Tsinghua University, analyzes that energy loss in crank presses accounts for 80% of the total work in one cycle. my country is a major producer of presses, and the high energy loss of crank presses makes my country's manufacturing industry not only a major consumer of resources but also a major source of environmental pollution.

[0003] Rotary motors, due to insufficient driving force, typically employ methods such as reducing speed to increase force, which complicates the press structure, wastes steel, and results in insufficient stamping flexibility. Japan has introduced servo presses that can control motor speed, improving stamping flexibility. However, the high price of motors makes them difficult to promote. This invention, on the other hand, is inexpensive, eliminates the need for speed reduction, simplifies the machine tool, and allows for direct matching of linear drive with the load. It uses a microcontroller to control the slide pressing operation, thereby enhancing international competitiveness. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the present invention provides a pulse electromagnetic press, which is driven by a pulse linear motor and uses a pre-compression spring starting mechanism to improve motor efficiency.

[0005] The present invention adopts the following technical solution.

[0006] A pulse electromagnetic press is characterized by being driven by an electromagnetic pulse motor and having a slider pushed by an elbow mechanism. The transmission mechanism is equipped with a transmission arm, which has a fixed length for the idle stroke and a fixed length for the load stroke. The transmission arm consists of two sets, left and right. The front section is fixed by a crossbar, and both ends of the crossbar are connected to a chain. The chain passes around a sprocket and is connected in sequence to a short spring, a lifting rotating rod, and an adjusting shaft, which are fixed to the rear panel of the machine. The rear section has a horizontal plate connecting the left and right sides. The front end of the transmission arm has a shaft hole that connects to both ends of a swing shaft, and its rear end is connected to both ends of a roller shaft. Both ends of the roller shaft are connected to a motor shaft with a power connecting rod. The shaft pulls the roller shaft, causing the roller to roll along a curved track, changing the pulse power magnitude, changing the power direction, and expanding the pulse width. The slider's idle stroke becomes the load stroke when it contacts the workpiece. It rotates around the front end as an instantaneous pivot and is also pushed forward by the curved track. Through the combined motion, the elbow mechanism drives the slider to reach a predetermined position, pressing the workpiece to undergo plastic deformation and silent pressing without elastic deformation. The electromagnetic pulse motor is fixed to the lower rear side of the machine, and the operating mechanism is installed at the bottom of the machine for easy manual foot operation.

[0007] The pulse electromagnetic press is characterized in that the pulse motor has a magnetic field and a non-magnetic field. The upper end of the stator is equipped with a non-magnetic housing and the lower end is equipped with a lower non-magnetic housing. When the motor is static, the mover is in a high position. When outputting, the microcontroller outputs a command to release the compression spring to generate elastic force to start the motor. When the mover reaches the set speed and is very close to the buffer magnetic pole, the speed sensor outputs a signal to trigger the Schmitt circuit to flip and control the electronic switch to conduct. The motor winding input current pulse width causes the mover and the buffer magnetic pole to generate a huge electromagnetic attraction. This manufactures large-tonnage and ultra-large-tonnage presses. After pressing the workpiece, the mover still has a lot of kinetic energy. It is buffered by the lower non-magnetic field. The irregular shaft above the housing is pulled down to press the upper support plate (the lower support plate is limited), which compresses the starting spring to store energy. The mover is buffered downward and also compresses the reset spring to reset the buffer magnetic pole and the mover, reducing the buffer speed to zero.

[0008] The electromagnetic pulse motor, wherein the moving part and the stator axis are highly coincident, is characterized in that a concentric positioning platform is machined on the upper end of the moving part. During assembly, the concentric positioning platform is used to make the moving part and the stator height concentric. After the assembly is concentric, the positioning platform is removed.

[0009] The electromagnetic pulse motor described above has a problem where the linear motion of the mover is affected by the guide clearance, preventing it from moving along the motor axis and causing an imbalance in the distribution of magnetic lines of force, thus rendering the motor unable to work. The key feature is that the stator's magnetic yoke uses multiple points to install rolling bearings, ensuring that the outer surface of the rolling bearings and the outer surface of the mover achieve "zero contact." The magnetic resistance of the rolling bearings is less than the magnetic resistance of the air gap, which helps to balance the distribution of magnetic lines of force, thereby enabling the mover to maintain linear motion along the axis.

[0010] The spring starting mechanism of the electromagnetic pulse motor is characterized in that an upper support plate and a lower support plate, on which a starting spring is installed, are movably mounted on a guide seat; a micro-elbow is installed at the top of the guide seat; the guide shaft itself is provided with a spring to maintain a straight line; a slight external force pushes the micro-elbow to release the spring compression state by changing the curve; the lower support plate is fixed to a triangular plate as a whole; the static irregular shaft of the motor stops at the top of the long groove of the triangular plate; the irregular shaft is fixed to the mover by a vertical rod; and the starting mechanism is provided with a lifting spring for self-reset.

[0011] The spring starting mechanism is characterized in that the compression of the starting spring is accomplished by utilizing the excess energy after the mover compresses the workpiece. The compression mechanism of the starting spring is as follows: the mover is fixedly connected to the irregular shaft on the upper part of the machine housing by a vertical rod. The mover buffers and pulls the irregular shaft to compress the upper support plate downward. The lower support plate is limited by the upper end cover, which enables the starting spring to be compressed. The compression is maintained by a micro-elbow lever. When the motor starts, the microcontroller outputs a command to control the micro-elbow lever to release the compressed spring.

[0012] The electromagnetic pulse motor is equipped with a speed sensor. Its features include a series of miniature permanent magnets fixed to the moving part of the actuator; the N and S poles of the permanent magnets are arranged in a straight line to form an induction body; a soft iron core is installed inside the induction coil, fixed in a stationary position and close to the induction body; the actuator drives the induction body to move, generating an induced electromotive force at both ends of the induction coil, the magnitude of which is proportional to the speed of the actuator; the two ends of the induction coil are connected to the input terminals of a Schmitt trigger, triggering the Schmitt circuit to flip, controlling the "electronic switch" to turn on and off, connecting the pulse current of the motor windings, and the magnetized iron core to generate electromagnetic attraction to output power.

[0013] The electromagnetic pulse motor is characterized in that the upper end cover of the motor is provided with a pressure holding time hook, which allows the irregular shaft to remain at the lowest point for a certain period of time, and the pressure holding end time is controlled by the second output command of the microcontroller.

[0014] The pulse electromagnetic press is characterized in that the power transmission mechanism is provided with a curved track, the slope of the curve is different at different positions of the track, the mover pulls the roller shaft to make the roller roll along the curved track, which plays the role of changing the magnitude and direction of the pulse power and expanding the pulse width: the slider makes the force equal to zero when it first contacts the workpiece, gradually increases to the nominal force, and maintains the nominal force until the workpiece is pressed. The direction of the power changes from vertical to tend to horizontal, and the pulse width changes to the end of the workpiece pressing.

[0015] The pulse electromagnetic press is characterized in that the working cycle of the press is controlled by a microcontroller. To protect the operator's safety, the slider is as light as possible and must not cause injury when placed on the hand. If the operator's hand accidentally enters the danger zone, it will not cause injury, but it will prevent the slider from reaching the set position. The sensor will not send a signal to the microcontroller to interrupt the stamping. The operation can only be resumed when the operator's hand leaves the danger zone. No infrared protective curtain is required.

[0016] The pulse electromagnetic press provided by this invention does not use a rotary motor drive, but a pulse linear motor drive. The motor is started by a pre-compression spring, and the energy conversion achieves the efficiency of a rotary motor, thus replacing the rotary motor. The electromagnetic drive stroke is short, which just covers the slider load stroke and matches the load. The flywheel is eliminated, the structure is simplified, the cost is reduced, and it is controlled by a single-chip microcomputer. It moves towards high-end manufacturing and saves energy significantly, promoting my country's manufacturing industry to enter a low-carbon, energy-saving, and high-quality development stage. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the present invention; Figure 2 This is a schematic diagram of a pulse motor. Figure 3 This is a schematic diagram of the connection between the mover and the non-standard shaft.

[0018] Workbench 201, V-shaped track 202, slider 203, lower slider lever 204, swing shaft 205, crossbar 230, main shaft 206, upper lever 207, reinforcing plate 208, chain 231, sprocket 211, transmission arm 222, roller shaft 224, short spring 225, lifting control lever 226, inclined upward pull spring 227, height adjustment shaft 228, high-position tension spring 234, curved track 225, roller 227, rear panel 228, power connecting rod 229, pulse motor 230, long hook 231, rotating short hook 232, separation hook 233, pedal lever 234.

[0019] 1. Lower end cover, 2. Lower non-magnetic housing, 3. Stator, 31. Buffer magnetic pole, 32. Winding plug, 33. Motor winding, 4. Upper non-magnetic housing, 5. Mover, 34. Rolling bearing, 6. Upper end cover, 60. Lifting spring, 61. Guide seat, 62. Lower support plate, 63. Guide rod, 64. Upper support plate, 65. Starting spring, 621. Spring positioning rod, 70. Micro elbow, 701. Energy release claw, 702. Release bearing, 703. Release fixing crossarm, 80. Induction coil, 81. Induction body, 51. Special-shaped shaft, 52. Lifting bracket, 53. Lifting upper elbow, 54. Lifting lower elbow, 55. Fixed vertical rod, 56. Low-position pressure holding hook, 621. Fixed triangular plate, 544. Lifting hook, 543. Diagonal rod, 541. Push-pull electromagnet, 542. Motor guide shaft, 7. Mover return spring, 8. Buffer magnetic pole return spring, 9. Bracket bolt, 10. Detailed Implementation

[0020] The embodiments of the present invention will be further described below with reference to the accompanying drawings and examples.

[0021] Figure 1 This is an embodiment of a pulse electromagnetic press. The machine body adopts an open structure, is welded from steel plates, and is placed vertically. The throat has a worktable 201, a V-shaped guide rail 202, and a slider elbow drive mechanism consisting of a lower elbow 204, an upper elbow 207, and a swing shaft 205.

[0022] The side panel of the machine body is machined with a rectangular hole, and a rectangular reinforcing plate 208 is fixed in the hole. The reinforcing plate is machined with a spindle hole and two transverse grooves, on which the spindle 206 and two upper elbows 207 are respectively installed. The upper and lower elbows are connected by a swing shaft 222 through a sliding sleeve. The upper end is connected to the spindle 206, and the lower end is connected to the slider 203 through a ball head.

[0023] The power transmission is a left-right structure with two transmission arms 222. The front part is fixed with a crossbar 230, and the front end is connected to both ends of the hinge shaft of the swing shaft 205. The two ends of the crossbar are connected to the chain 231. The rear half of the transmission arm 222 is fixed to the left and right with a crossbar 223. The chain 231 passes around the sprocket 211 and pulls the crossbar 230 diagonally upward, so that the swing shaft 221 can swing upward around the main axis. It swings back by the weight of the slider 204 and controls the slider 203 to run without load.

[0024] When the slider 202 descends to contact the workpiece, it is the load stroke: the slider 203 is subject to huge resistance from the workpiece, the transmission arm 222 rotates around the front end as the instantaneous rotation axis, and at the same time, it is pushed forward by the curved track 225 to perform translational motion, which pushes the elbow mechanism to control the slider 203 to reach the set position in time, presses the workpiece to perform plastic deformation, and achieves silent stamping.

[0025] After stamping is completed, the moving part 5 has a large kinetic energy. It is buffered in the lower non-magnetic space 2 to reduce the speed to zero. The upper end cover 6 of the motor is equipped with a low-position pressure-holding hook 56. Figure 3 As shown in the figure, the irregular shaft is held at the lowest position for a certain period of time, and the microcontroller gives a second command to control the pressure holding time to end.

[0026] The pulse electromagnetic press is controlled by a microcontroller to ensure safe operation and prevent hand injuries: the slider 203 is lightweight and should be placed slowly on the hand to avoid injury; it should only block the slider from reaching the set position; the sensor should not send a signal to the microcontroller or release the mover, thus protecting the operator's safety and eliminating the need for an infrared protection device.

[0027] Pulse motors have enormous output thrust, which can be used to manufacture large-tonnage and ultra-large-tonnage presses. The lower end cover 1 and upper end cover 6 of the motor housing are machined from 45 steel. The end cover has a shaft hole in the center to fix the guide shaft. It is made of non-magnetic stainless steel and fits tightly with the guide hole. The mover 5 is in dynamic fit with the guide shaft using a self-lubricating sleeve. The motor stator 3 is made of high magnetic permeability material. The upper non-magnetic housing 4 and lower non-magnetic housing 2 can be made of polymer material.

[0028] The motor winding frame 32 is cast from high-temperature resistant engineering plastic, and all springs are machined according to parameters.

[0029] The pulse linear motor's mover 5 does not rotate but only performs linear motion. The motor installation requires that the mover 5 and stator 3 be highly concentric: a concentricity positioning table is machined at the top of the mover 5, and the positioning table is removed after installation. The mover 5's linear motion requires it to run in a straight line along the motor's central axis without deviation. However, due to the large clearance of the guide sleeve's moving fit, this requirement cannot be met. In order to eliminate the moving fit clearance that causes the mover 5 to deviate from the axis, the stator magnetic yoke selects multiple fixed rolling bearings to achieve "zero contact" between the outer surface of the rolling bearing 34 and the outer surface of the mover, thus limiting the mover 5's linear motion along the axis to maintain "zero error".

[0030] In this implementation scheme, the motor is started by a compression spring, completely eliminating electromagnetic force. When the starter speed reaches the set value, the speed sensor triggers the Schmitt circuit to flip, and a narrow electromagnetic pulse of a certain width is input to the motor winding 33. The magnetic pole distance is extremely close, the output electromagnetic force is huge, and it is used to manufacture large and super-sized presses.

[0031] After the moving part 5 completes the stamping process, it has a large kinetic energy and urgently needs to decelerate. In this implementation scheme, the moving part 5 is connected to the irregular shaft 51 outside the housing. The moving part 5 buffers the irregular shaft 51, causing the upper support plate 64 of the pressing start mechanism to move down, and the lower support plate 62 is limited by the upper end cover 6 of the motor, thereby compressing the starting spring 65 to store energy. This pre-compresses the spring to prepare for restarting the motor. The microcontroller controls the micro-toggle lever 70 to release the compressed spring and start the motor. The connection between the moving part 5 and the irregular shaft 51 is shown in the figure. Figure 3 As shown.

[0032] When the pulse motor does not output, the mover 5 stops at the high position of the housing. The irregular shaft is at the top of the long slot of the triangular plate 621. When outputting, the microcontroller commands to release the mover 5. The push-pull electromagnet 541 is energized and actuated. The transmission component causes the lifting hook 544 to move slightly to the right, pulling the lifting elbow bar to change the zigzag line, causing the mover to lose support and descend. The irregular shaft accelerates the mover 5.

[0033] Triangular plate 621 moves downward, driving release crossarm 703 to pull release rotating rod 702 downward, causing rotating release claw 701 to rotate. The lower bearing pushes micro elbow rod 70 to change zigzag, thereby releasing the compression spring. The combined force of spring force and mover weight accelerates the starter 5 to reach the set speed, triggering Schmitt circuit to flip, inputting a certain electromagnetic pulse to the motor winding, causing the motor to output electromagnetic power.

[0034] The stator 3 has a non-magnetic shell 2 on its lower side to form a non-magnetic space. The mover 5 has a large kinetic energy to buffer and decelerate in the lower non-magnetic space. The mover reset spring 8 is compressed to reset the mover 5, and the buffer magnetic reset spring 9 is compressed to reset the buffer magnetic pole.

[0035] The electromagnetic pulse press is operated manually, with a foot pedal lever located at the bottom of the machine body: the operator steps on the lever 234 to control the separation hook 233 to pull and rotate the short hook 232 and the long hook 231 to separate them, so that the connected high-position tension spring 234 loses its function, and the slider 203 can move down to the working position by its own weight.

[0036] Working principle of pulse electromagnetic press: The manual step on the foot pedal lever 234 causes the short hook 232 to separate from the long hook 231, the high-position tension spring loses its function, the rotating rod 226 rotates to be close to a straight line with the chain 231, the slider moves down from the high position to the working position under the action of gravity, the position sensor sends a signal to the microcontroller to release the mover 5, the push-pull electromagnet 541 is energized and the left end of the pull-down diagonal rod 543 moves downward, the upper end of the vertical rod 542 swings slightly to the right, the pull-out hook 544 is pulled and the lower lifting elbow 54 and the upper lifting elbow 53 are separated from the straight line, the mover 5 loses support and moves downward, at the same time, the downward movement of the mover 5 drives the top of the triangular plate long slot to drive the special-shaped shaft 51 to move downward, drive the release crossbeam 703 to move downward and drive the release bearing 702 to pull down and compress the right end of the release claw 701 to rotate downward, so that the lower bearing pushes the micro elbow 70 to change the broken line release spring compression state to generate elastic force, so that the top of the triangular plate 621 long slot pulls down the special-shaped shaft 51 to accelerate the mover 5.

[0037] When the right end of the transmission arm 222 begins to descend, it must first go through the motor starting process, and the front end of the transmission arm is blocked by the workpiece (initial position as follows). Figure 1 (As shown by the dashed line) During the motor startup process, the transmission arm shortens, causing the right-end roller to roll along the curved track 225 to the beginning of the load stroke. The roller 224 rolls downward along the curved track 225 to change the pulse power. The slider 203 is blocked from descending. The transmission arm 222 rotates around the front end as an instantaneous axis and is also pushed by the curved track 225 to translate. This pushes the swing shaft 205 to drive the slider 203 to reach the set position on time to complete the pressing operation. The slider 203 resets and sends a signal to the microcontroller, waiting for the next pressing.

Claims

1. A pulse electromagnetic press, characterized in that, Driven by an electromagnetic pulse motor, the slider is propelled by an elbow mechanism. The transmission mechanism includes a transmission arm with a fixed length for the idle stroke and a fixed length for the load stroke. The transmission arm consists of two sets, left and right. The front section is fixed with a crossbar, and both ends of the crossbar are connected to a chain. The chain passes around a sprocket and connects to a short spring, a lifting rotating rod, and an adjusting shaft, which are fixed to the rear panel of the machine. The rear section has a horizontal plate connecting the left and right sides. The front end of the transmission arm has a shaft hole that connects to both ends of a swing shaft, and its rear end connects to both ends of a roller shaft. Both ends of the roller shaft are connected to a motor shaft with a power connecting rod. The shaft pulls the roller shaft, causing the roller to roll along a curved track, changing the pulse power magnitude, direction, and pulse width. When the slider is in idle operation and contacts the workpiece, it becomes a load stroke. The slider rotates around the front end as an instantaneous pivot and is also propelled forward by the curved track. Through this combined motion, the elbow mechanism drives the slider to the predetermined position, pressing the workpiece to undergo plastic deformation. This silent pressing process prevents elastic deformation. The electromagnetic pulse motor is fixed to the lower rear side of the machine, and the operating mechanism is installed at the bottom of the machine for easy manual foot operation.

2. The pulse electromagnetic press according to claim 1, characterized in that, The pulse motor has a magnetic field and a non-magnetic field. The upper non-magnetic housing is installed on the upper end of the stator, and the lower non-magnetic housing is installed on the lower end. When the motor is static, the mover is in a high position. When outputting, the microcontroller outputs a command to release the compression spring and generate elastic force to start the motor. When the mover reaches the set speed and is very close to the buffer magnetic pole, the speed sensor outputs a signal to trigger the Schmitt trigger circuit to flip and control the electronic switch to conduct. The input current pulse width of the motor winding causes the mover and the buffer magnetic pole to generate a huge electromagnetic attraction. When manufacturing large-tonnage and ultra-large-tonnage presses, the mover still has a lot of kinetic energy after pressing the workpiece. It is buffered by the lower non-magnetic field and pulls the irregular shaft above the housing to press down the upper support plate (the lower support plate is limited), which compresses the starting spring to store energy. The mover is buffered downward and also compresses the reset spring, which resets the buffer magnetic pole and the mover, reducing the buffer speed to zero.

3. The electromagnetic pulse motor according to claim 2, wherein the axis of the mover and the axis of the stator are highly coincident, characterized in that, A concentric positioning stage is machined on the upper end of the mover. During assembly, the concentric positioning stage is used to make the mover and stator height concentric. After the assembly is concentric, the positioning stage is removed.

4. In the electromagnetic pulse motor according to claim 3, the linear motion of the mover is affected by the guide clearance, preventing it from moving along the motor axis and causing an imbalance in the distribution of magnetic lines of force, thus rendering the motor unable to work. The characteristic of this motor is that... The stator's magnetic yoke is equipped with rolling bearings at multiple points, so that the outer surface of the rolling bearings and the outer surface of the mover achieve "zero contact". The magnetic resistance of the rolling bearings is less than that of the air gap, which helps to balance the distribution of magnetic lines of force, thereby enabling the mover to maintain linear motion along the axis.

5. The electromagnetic pulse motor according to claim 2, wherein the spring-starting mechanism is characterized in that, The upper and lower support plates, each equipped with a starting spring, are movably mounted on the guide seat. A micro-elbow is mounted on the top of the guide seat. The guide shaft itself is equipped with a spring that maintains a straight line. When a small external force pushes the micro-elbow, it can release the spring compression state by changing the curve. The lower support plate is fixed to the triangular plate as one unit. The static irregular shaft of the motor stops at the top of the long slot of the triangular plate. The irregular shaft is fixed to the mover with a vertical rod. The starting mechanism is equipped with a lifting spring for self-reset.

6. The spring-starting mechanism according to claim 5, characterized in that, The compression of the starting spring is accomplished by utilizing the excess energy after the mover compresses the workpiece. The compression mechanism of the starting spring is as follows: the mover is fixedly connected to the irregular shaft on the upper part of the machine housing by a vertical rod. The mover buffers and pulls the irregular shaft downward to compress the upper support plate. The lower support plate is limited by the upper end cover, which enables the starting spring to be compressed. The compression is maintained by the micro-elbow lever. When the motor starts, the microcontroller outputs a command to control the micro-elbow lever to release the compressed spring.

7. The electromagnetic pulse motor according to claim 2 is equipped with a speed sensor, characterized in that, The induction body is composed of numerous miniature permanent magnets fixed on the moving parts of the mover. The N and S poles of the permanent magnets are arranged in a straight line to form the induction body. The induction coil contains a soft iron core, which is fixed in a stationary position and close to the induction body. The mover drives the induction body to move, generating an induced electromotive force at both ends of the induction coil. The magnitude of the electromotive force is proportional to the speed of the mover. The two ends of the induction coil are connected to the input terminals of the Schmitt trigger, which triggers the Schmitt circuit to flip, controls the "electronic switch" to turn on and off, connects the pulse current of the motor winding, and magnetizes the iron core to generate electromagnetic attraction to output power.

8. The electromagnetic pulse motor according to claim 2, characterized in that, The upper cover of the motor is equipped with a pressure holding time hook, which allows the irregular shaft to remain at the lowest point for a certain period of time. The pressure holding end time is controlled by the second output command of the microcontroller.

9. A pulse electromagnetic press according to claim 1, characterized in that, The power transmission mechanism has a curved track with different slopes at different positions. The mover pulls the roller shaft to make the roller roll along the curved track, which changes the magnitude and direction of the pulse power and expands the pulse width. When the slider first contacts the workpiece, the force is equal to zero. It gradually increases to the nominal force and then maintains the nominal force until the workpiece is pressed. The direction of the power changes from vertical to horizontal, and the pulse width changes to the end of pressing the workpiece.

10. A pulse electromagnetic press according to claim 1, characterized in that... The press's working cycle is controlled by a microcontroller. To protect the operator's safety, the slider is made as lightweight as possible, so that it cannot cause injury when placed in the hand. If the operator's hand accidentally enters the danger zone, it will not cause injury, but it will prevent the slider from reaching the set position. The sensor will not send a signal to the microcontroller to interrupt the stamping process. The operation can only be resumed when the operator's hand leaves the danger zone. There is no need to install an infrared protective curtain.

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