A floating forming pressing method of an electric cylinder magnetic field press and a pressing calculation method thereof

Abstract

The invention discloses a floating forming pressing method of an electric cylinder magnetic field press and a pressing calculation method thereof. According to the powder adding height, the lower electric cylinder runs from the end position of protective demoulding to the powder adding position. After the powder is added, the lower electric cylinder slightly descends, and the upper electric cylinder runs from the initial position to the orientation position. After the orientation is completed, the floating pressing distance of the upper and lower electric cylinders is calculated according to the product size. The upper and lower electric cylinders perform floating pressing at the same speed. After the floating pressing is completed, the upper electric cylinder slightly rises. After the slight rise is completed, the running distance of the upper and lower cylinders for protective demoulding is calculated according to the current positions of the upper and lower electric cylinders. After the synchronous operation of the upper and lower electric cylinders for protective demoulding is completed, the upper electric cylinder runs to the initial position, the product is taken out, and a pressing cycle is completed.

Description

Technical Field

[0001] The present invention relates to the technical field of a NdFeB powder magnetic field forming press, and in particular to a floating forming pressing method and a pressing calculation method of an electric cylinder magnetic field press for magnetic field forming of NdFeB powder using the electric cylinder magnetic field press. Background Art

[0002] During the pressing process, the existing magnetic field forming hydraulic press controls the proportional valve to open any opening according to the pressing process requirements, thereby controlling the flow rate, thereby controlling the speed and pressure of the hydraulic press, and then cooperates with the magnetic scale to read the real-time position of the upper and lower cylinders to complete the NdFeB powder pressing and forming control process. However, due to the lag time factor problem of the proportional valve during the position control closing process, the size of the pressed product has a large deviation of more than ±0.2mm, which not only affects the product quality, but also causes a large waste of subsequent processing.

[0003] The authorized patent number ZL202010669445.4, which was announced on September 11, 2020, discloses a mold, a pressing method and a product of a neodymium iron boron magnetic material. The invention discloses a mold, a pressing method and a product of a neodymium iron boron magnetic material. The mold includes a number of independent mold cavities, a first magnetic conductive plate, a second magnetic conductive plate, a first adjustment block and a second adjustment block. The mold of this invention can avoid the problem of magnetic circuit disorder caused by a single-mold multi-cavity mold in the prior art. The magnetic field deviation of each mold cavity is small, the deformation of the produced blank is small, the blank design yield is improved, and the magnetic declination of the product is small. However, the problem of pressing size deviation that may exist in the pressing process has not been solved. Summary of the invention

[0004] The present invention aims to solve the problem that in the existing magnetic field forming hydraulic press, during the magnetic field forming and pressing process of neodymium iron boron powder, the size of the product after pressing and forming has a large deviation, the deviation reaches more than ±0.2mm, which not only affects the product quality, but also causes a large waste in subsequent processing. The present invention provides a floating forming and pressing method of an electric cylinder magnetic field press, which can improve the size accuracy of the product after pressing and forming, reduce the pressing and forming deviation, and improve the product quality, and a pressing calculation method thereof.

[0005] The specific technical solution adopted by the present invention to solve the above technical problems is: a floating molding pressing method of an electric cylinder magnetic field press, which is composed of the following floating molding pressing method through four positions: the distance from the upper electric cylinder to the mold frame surface, the distance from the lower electric cylinder to the mold frame surface, the powder adding height and the product size:

[0006] When the upper and lower electric cylinders are at their initial positions, the button is activated once. After the lower electric cylinder moves to the position flush with the upper surface of the mold frame, the powder adding, orientation, floating pressing, micro-lift demoulding and upper electric cylinder recovery task stages are performed in sequence. A1. Powder adding stage: After the lower electric cylinder moves downward from the lower electric cylinder protection demoulding end position to the powder adding height, it reaches the lower electric cylinder powder adding position, and performs the task of adding NdFeB powder at the lower electric cylinder powder adding position; after adding NdFeB powder, the lower electric cylinder continues to move downward to slightly drop the height by 10mm, and reaches the lower electric cylinder slightly dropped position;

[0007] A2. Orientation stage: After the upper cylinder moves downward from the initial position of the upper cylinder to the distance between the upper cylinder and the mold frame surface and the orientation distance, it stops moving downward at the orientation position of the upper cylinder and starts to perform the orientation magnetization task;

[0008] A3. Floating pressing stage: After the orientation task in the above A2 stage is completed, the pressing distance of the upper electric cylinder and the pressing distance of the lower electric cylinder are calculated according to the product size, and the upper and lower electric cylinders move relative to each other at the same speed to perform the floating pressing task; after the floating pressing task is completed, the upper electric cylinder reaches the upper electric cylinder floating pressing position, and the lower cylinder reaches the lower electric cylinder floating pressing position;

[0009] A4. Micro-lift demoulding stage: The upper cylinder moves upward from the floating pressing position of the upper cylinder to a micro-lift height and reaches the micro-lift position of the upper cylinder; after the micro-lift, the demoulding distance of the upper cylinder and the demoulding distance of the lower cylinder are calculated according to the current positions of the upper cylinder and the lower cylinder. The upper cylinder and the lower cylinder move upward at the same speed to the demoulding distance. After the protection demoulding synchronous operation is completed, the upper cylinder reaches the upper cylinder protection demoulding end position, and the lower cylinder reaches the cylinder protection demoulding end position;

[0010] A5. Upper cylinder recovery stage: The upper cylinder starts from the upper cylinder protection demoulding end position, continues to run upwards for the upper cylinder recovery distance, reaches the upper cylinder initial position, and takes out the product;

[0011] Note: The distance from the upper electric cylinder to the mold frame surface is the distance from the upper electric cylinder's initial position downward to the mold frame surface position; the distance from the lower electric cylinder to the mold frame surface is the distance from the lower electric cylinder's upward movement to the mold frame surface position; the powder adding height is the height distance between the top surface of the lower electric cylinder and the mold frame surface position when the lower electric cylinder starts to move downward from the lower electric cylinder's protective demoulding end position to the lower electric cylinder's powder adding position.

[0012] The upper and lower electric cylinders are controlled by four positions, and the speed and pressing position of the upper and lower electric cylinders are controlled to cooperate with each other to complete the floating forming pressing, which better guarantees the dimensional accuracy of the pressed products, makes the pressed products less likely to crack, improves product quality, and reduces production costs. It can improve the dimensional accuracy of the pressed products, reduce the pressing deviation, and improve product quality.

[0013] Preferably, an initial stage is provided before the powder adding stage. When executing the initial stage task, before the electric cylinder magnetic field press starts floating molding and pressing, the upper electric cylinder is located at the upper electric cylinder initial position, the lower electric cylinder is located at the lower electric cylinder initial position, the lower electric cylinder passes through the middle of the mold frame, and the lower electric cylinder runs upward for the distance from the lower electric cylinder to the mold frame surface, and then runs to the lower electric cylinder protection demoulding end position, at which time the top surface of the lower electric cylinder mold is flush with the upper surface of the mold frame. This improves the effectiveness of the initialization configuration before the powder adding stage and improves the accuracy of powder adding.

[0014] Preferably, after the first floating forming and pressing task is completed, if the next action cycle floating forming and pressing task needs to be continued, the next action cycle floating forming and pressing task is executed from the powder adding stage to the end of the upper electric cylinder rising stage, and the cycle is executed in this way. The effectiveness of the cyclic execution of floating forming and pressing tasks for multiple products is improved.

[0015] Another invention object of the present invention application is to provide a floating forming pressing calculation method of an electric cylinder magnetic field press, including the following pressing calculation method:

[0016] S1. According to the floating molding pressing method described in one of the above technical solutions, the floating molding pressing product needs to set the corresponding four operation position parameters, which are the distance from the lower electric cylinder to the mold frame surface, the distance from the upper electric cylinder to the mold frame surface, the powder adding height and the product size;

[0017] S2. According to the requirements of the four operation position parameters, the upper electric cylinder lead and the lower electric cylinder lead are converted into electric cylinder pulses, and the electric cylinder lead distance 1mm is converted into a decimal pulse number. Similarly, the micro-descent height is converted into a decimal pulse number, the orientation distance is converted into a decimal pulse number, and the micro-rise height is converted into a decimal pulse number;

[0018] S3. Based on the decimal pulse data obtained by conversion, the floating forming pressing method described in one of the above technical solutions is completed.

[0019] As a preferred embodiment, the four operation position parameters are set as: distance from lower electric cylinder to mold frame surface = D400, distance from upper electric cylinder to mold frame surface = D412, powder adding height = D404, product size = D420; where D is a data register, and each data register D is 16-bit data;

[0020] According to the lead of the electric cylinder, the electric cylinder pulse is converted to 1mm=K400, the micro-descent height is 10mm, that is, K400×10=K4000, the orientation distance is 10mm, that is, K400×10=K4000, and the micro-lift height is 1mm, that is, K400; K represents decimal, K400 is decimal 400, that is, 1mm=400 pulses, and so on;

[0021] The lower electric cylinder first moves upward from the initial position to the distance D400 from the mold frame surface, taking this as the reference position, and then moves downward to the powder adding height D404. After the NdFeB powder is added, the lower electric cylinder moves downward again to slightly lower the height K4000.

[0022] The upper electric cylinder moves downward from the initial position in sequence, the distance from the upper electric cylinder to the mold frame surface is D412, the orientation distance, and the running distance is D416 = D412 + K4000;

[0023] Because the lower electric cylinder's slight drop height is equal to the upper electric cylinder's orientation distance, the distance between the upper and lower electric cylinders before floating pressing is equal to the powder adding height. During floating pressing, the upper and lower electric cylinders move relative to each other at the same speed and the running distance is equal. The distance between the upper and lower electric cylinders after floating pressing is the product size D420, so the pressing running distance of the upper and lower electric cylinders D432 = (D404-D420) / 2;

[0024] After the pressing is completed, the upper electric cylinder slightly rises K400, and the lower electric cylinder starts from the end position of the protective demoulding. The total running distance is the powder adding height + slight lowering height - floating pressing distance, so the distance that the upper and lower electric cylinders need to run for protective demoulding is D440 = D404 + K4000 - D432;

[0025] After the protective demoulding operation is completed, the upper electric cylinder needs to return to the initial position. Starting from the initial position, the total running distance of the upper electric cylinder is the distance from the upper electric cylinder to the mold frame surface + orientation distance + floating pressing distance - micro-lift distance - protective demoulding distance, so the final distance for the upper electric cylinder to return to the initial position is D456 = D416 + D432-K400-D440;

[0026] Note: D400, D404, D412 and D420 mentioned above all refer to the register codes. The specific set values ​​are entered in the registers, which are the data registers in the PLC. The micro-descent height and orientation distance are also the input set values ​​of the input data registers. The unit of the above data register input parameters is mm.

[0027] Improve the simplicity, reliability and effectiveness of the pressing calculation of floating molding control and improve the pressing accuracy.

[0028] The beneficial effects of the present invention are: the speed and pressing position of the upper electric cylinder and the lower electric cylinder are controlled by four positions, and the floating forming pressing is completed by mutual cooperation, which better guarantees the dimensional accuracy of the pressed product, makes the pressed product less likely to crack, improves the product quality, and reduces the production cost. It can improve the dimensional accuracy of the pressed product, reduce the pressing deviation, and improve the product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0030] Figure 1 It is a structural schematic diagram of the initial positions of the upper and lower electric cylinders in the floating forming pressing method of the electric cylinder magnetic field press of the present invention.

[0031] Figure 2 It is a structural schematic diagram of the lower electric cylinder protection demoulding end position in the floating molding pressing method of the electric cylinder magnetic field press of the present invention.

[0032] Figure 3 It is a structural schematic diagram of the powder adding position of the lower electric cylinder in the floating forming pressing method of the electric cylinder magnetic field press of the present invention.

[0033] Figure 4 It is a structural schematic diagram of the slightly lowered position of the lower electric cylinder in the floating forming pressing method of the electric cylinder magnetic field press of the present invention.

[0034] Figure 5 It is a structural schematic diagram of the orientation position of the upper electric cylinder in the floating forming pressing method of the electric cylinder magnetic field press of the present invention.

[0035] Figure 6 It is a structural schematic diagram of the positions of the upper and lower electric cylinders after floating pressing in the floating forming pressing method of the electric cylinder magnetic field press of the present invention.

[0036] Figure 7 It is a structural schematic diagram of the upper electric cylinder slightly rising in the floating forming pressing method of the electric cylinder magnetic field press of the present invention.

[0037] Figure 8 It is a structural schematic diagram of the end positions of upper and lower electric cylinders protecting demoulding in the floating molding pressing method of the electric cylinder magnetic field press of the present invention.

[0038] Fig. 9 It is a structural schematic diagram of the upper electric cylinder returning to the initial position in the floating forming pressing method of the electric cylinder magnetic field press of the present invention. DETAILED DESCRIPTION

[0039] Embodiment 1:

[0040] Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 In the embodiment shown, a floating molding pressing method of an electric cylinder magnetic field press is provided, wherein the distance D2 (see Figure 2 ), the distance from the lower electric cylinder to the mold frame surface D1 (see Figure 1 ), powder adding height D3 (see Figure 3 ) and product size D4 (see Figure 6) The four positions constitute the following floating molding pressing method. When the upper and lower electric cylinders are in the initial positions respectively, the button is started once. After the lower electric cylinder runs to the position flush with the upper surface of the mold frame 30, the powder adding, orientation, floating pressing, micro-lifting demolding and upper electric cylinder rising task stages are executed in sequence.

[0041] A1. Powder adding stage: the lower electric cylinder runs downward from the lower electric cylinder protection demoulding end position XD2 to the powder adding height D3, and reaches the lower electric cylinder powder adding position XD3, where the NdFeB powder adding task is performed; after the NdFeB powder is added, the lower electric cylinder continues to run downward and slightly drops to a height of D12 (see Figure 4 ), reaching the lower electric cylinder slightly lowered position XD4;

[0042] A2. Orientation stage: The upper cylinder moves downward from the initial position SD1 to the distance D2 from the upper cylinder to the mold frame surface and the orientation distance D8 (see Figure 5 ), it reaches the upper electric cylinder orientation position SD2 and stops moving downward, and starts to perform the orientation magnetization task;

[0043] A3. Floating pressing stage: After the orientation task in the above A2 stage is completed, the product size D4 (see Figure 6 ), calculate the pressing distance D9 of the upper electric cylinder and the pressing distance D10 of the lower electric cylinder, and the upper and lower electric cylinders move relative to each other at the same speed to perform the floating pressing task; after the floating pressing task is completed, the upper electric cylinder reaches the upper electric cylinder floating pressing position SD3, and the lower cylinder reaches the lower electric cylinder floating pressing position XD6;

[0044] A4. Micro-lift demoulding stage: The upper cylinder floats from the upper cylinder to the position SD3 after pressing, and moves upward to a micro-lift height of D11 (see Figure 7 ), and reaches the upper cylinder slightly raised position SD4; after the slight rise, according to the current position of the upper cylinder and the lower cylinder, calculate the upper cylinder demoulding distance D5 (see Figure 8 ), demoulding distance of lower electric cylinder D13, upper electric cylinder and lower electric cylinder move upward demoulding distance at the same speed, after demoulding protection synchronous operation is finished, upper electric cylinder reaches demoulding protection end position SD5, lower electric cylinder reaches demoulding protection end position XD2;

[0045] A5. Upper cylinder recovery stage: The upper cylinder starts from the upper cylinder protection demoulding end position SD5 and continues to move upward. The upper cylinder recovers the distance D6 (see Fig. 9 ), arrive at the initial position SD1 of the upper electric cylinder, and take out the product;

[0046] Note: The distance from the upper electric cylinder to the mold frame surface is the distance from the upper electric cylinder's initial position to the mold frame surface; the distance from the lower electric cylinder to the mold frame surface is the distance from the lower electric cylinder's upward movement to the mold frame surface; the powder adding height is the height distance between the top surface of the lower electric cylinder and the mold frame surface when the lower electric cylinder starts to move downward from the lower electric cylinder's protective demoulding end position XD2 to the lower electric cylinder's powder adding position; the product size is also the height size requirement of the product itself that needs floating press molding.

[0047] There is an initial stage before the powder adding stage. When executing the initial stage task, before the electric cylinder magnetic field press starts floating molding and pressing, the upper electric cylinder is located at the upper electric cylinder initial position SD1, the lower electric cylinder is located at the lower electric cylinder initial position XD1, the lower electric cylinder passes through the middle of the mold frame 30, and the lower electric cylinder moves upward to the mold frame surface distance D1, and then runs to the lower electric cylinder protection demoulding end position XD2. At this time, the top surface of the lower electric cylinder mold is flush with the upper surface of the mold frame 30. After completing the first floating molding and pressing task, if it is necessary to continue to execute the next action cycle floating molding and pressing task, the next action cycle floating molding and pressing task is executed from the powder adding stage to the end of the upper electric cylinder recovery stage, and so on.

[0048] Embodiment 2:

[0049] Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 In the embodiment shown, a floating forming pressing calculation method of an electric cylinder magnetic field press includes the following pressing calculation method:

[0050] S1. According to the floating molding pressing method described in Example 1, the floating molding pressing product needs to set the corresponding four operation position parameters, which are the distance from the lower electric cylinder to the mold frame surface, the distance from the upper electric cylinder to the mold frame surface, the powder adding height and the product size;

[0051] S2. According to the requirements of the four operation position parameters, the upper electric cylinder lead and the lower electric cylinder lead are converted into electric cylinder pulses, and the electric cylinder lead distance 1mm is converted into a decimal pulse number. Similarly, the micro-descent height is converted into a decimal pulse number, the orientation distance is converted into a decimal pulse number, and the micro-rise height is converted into a decimal pulse number;

[0052] S3. According to the decimal pulse data obtained by conversion, the floating forming pressing method described in Example 1 is completed.

[0053] The four operation position parameters are set as follows: distance from lower electric cylinder to mold frame surface = D400, distance from upper electric cylinder to mold frame surface = D412, powder adding height = D404, product size = D420; where D is the data register, and each data register D is 16-bit data;

[0054] According to the lead of the electric cylinder, the electric cylinder pulse conversion is 1mm=K400, the micro-descent height is 10mm, that is, K400×10=K4000, the orientation distance is 10mm, that is, K400×10=K4000 (that is, 4000 pulses), and the micro-lift height is 1mm, that is, K400 (that is, 400 pulses); K represents decimal, K400 is decimal 400, that is, 1mm=400 pulses, and so on;

[0055] The lower electric cylinder first moves upward from the initial position to the mold frame surface distance D400, taking this as the reference position, and then moves downward to the powder adding height D404. After the NdFeB powder is added, the lower electric cylinder moves downward again to slightly lower the height K4000 (i.e. 4000 pulses or 10);

[0056] The upper electric cylinder moves downward from the initial position in sequence, the distance D412 from the upper electric cylinder to the mold frame surface and the orientation distance, and the running distance is D416=D412+K4000 (that is, the running distance is D416=D412+10.);

[0057] Because the lower electric cylinder's slight drop height is equal to the upper electric cylinder's orientation distance, the distance between the upper and lower electric cylinders before floating pressing is equal to the powder adding height. During floating pressing, the upper and lower electric cylinders move relative to each other at the same speed and the running distance is equal. The distance between the upper and lower electric cylinders after floating pressing is the product size D420, so the pressing running distance of the upper and lower electric cylinders D432 = (D404-D420) / 2;

[0058] After the pressing is completed, the upper electric cylinder slightly rises K400, and the lower electric cylinder starts from the end position of the protective demoulding. The total running distance is the powder adding height + slight lowering height - floating pressing distance. Therefore, the distance that the upper and lower electric cylinders need to run for protective demoulding is D440 = D404 + K4000 - D432 (that is, D440 = D404 + 10 - D432).

[0059] After the protective demoulding operation is completed, the upper electric cylinder needs to return to the initial position. Starting from the initial position, the total running distance of the upper electric cylinder is the distance from the upper electric cylinder to the mold frame surface + orientation distance + floating pressing distance - micro-lift distance - protective demoulding distance, so the final distance for the upper electric cylinder to return to the initial position is D456 = D416 + D432 - K400 - D440 (i.e. D456 = D416 + D432-1-D440);

[0060] Note: D400, D404, D412, and D420 in the above all refer to the register codes. The specific set values ​​are entered in the registers, which are the data registers in the PLC. The micro-drop height and orientation distance are also the input set values ​​of the input data registers. The units of the above data register input parameters are mm. The micro-drop height is a set value D1. The micro-drop height must be greater than the micro-rise height. The micro-rise is mainly to release stress, and the micro-drop is to prevent the powder from escaping when the upper mold is pressed down. (2) The orientation distance is another set value D2, which can be the same as or different from the micro-drop height.

[0061] In the description of the positional relationship of the present invention, terms such as "inside", "outside", "up", "down", "left", "right", etc. that indicate orientation or positional relationship are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing the embodiments and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0062] The above content and structure describe the basic principle, main features and advantages of the product of the present invention, which should be understood by those skilled in the art. The above examples and descriptions are only for explaining the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which are within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A pressing calculation method for a floating forming pressing method based on an electric cylinder magnetic field press, characterized in that: The floating molding pressing method is formed by the distance from the upper electric cylinder to the mold frame surface, the distance from the lower electric cylinder to the mold frame surface, the powder adding height and the product size. When the upper and lower electric cylinders are in their initial positions, the button is activated once. After the lower electric cylinder moves to the position flush with the upper surface of the mold frame, the powder adding, orientation, floating pressing, micro-lift demoulding and upper electric cylinder lifting task stages are performed in sequence. A1. Powder adding stage: After the lower electric cylinder moves downward from the lower electric cylinder protection demoulding end position to the powder adding height, it reaches the lower electric cylinder powder adding position, and performs the task of adding NdFeB powder at the lower electric cylinder powder adding position; after adding NdFeB powder, the lower electric cylinder continues to move downward and slightly descends to the lower electric cylinder slightly descending position; A2. Orientation stage: After the upper cylinder moves downward from the initial position of the upper cylinder to the distance between the upper cylinder and the mold frame surface and the orientation distance, it reaches the orientation position of the upper cylinder and stops moving downward to start the orientation magnetization task; A3. Floating pressing stage: After the orientation task in the above A2 stage is completed, the pressing distance of the upper electric cylinder and the pressing distance of the lower electric cylinder are calculated according to the product size. The upper and lower electric cylinders move relative to each other at the same speed to perform the floating pressing task. After the floating pressing task is completed, the upper electric cylinder reaches the upper electric cylinder floating pressing position, and the lower cylinder reaches the lower electric cylinder floating pressing position; A4. Micro-lift demoulding stage: The upper cylinder moves upward from the floating pressing position of the upper cylinder to a micro-lift height and reaches the micro-lift position of the upper cylinder; after the micro-lift, the demoulding distance of the upper cylinder and the demoulding distance of the lower cylinder are calculated according to the current positions of the upper cylinder and the lower cylinder. The upper cylinder and the lower cylinder move upward at the same speed to the demoulding distance. After the synchronous operation of the protective demoulding is completed, the upper cylinder reaches the upper cylinder protective demoulding end position, and the lower cylinder reaches the electric cylinder protective demoulding end position; A5. Upper cylinder recovery stage: The upper cylinder starts from the upper cylinder protection demoulding end position, continues to move upward, reaches the upper cylinder recovery distance, reaches the upper cylinder initial position, and takes out the product; Among them: the distance from the upper electric cylinder to the mold frame surface is the distance from the upper electric cylinder's initial position to the mold frame surface; the distance from the lower electric cylinder to the mold frame surface is the distance from the lower electric cylinder's upward movement to the mold frame surface; the powder adding height is the height distance between the top surface of the lower electric cylinder and the mold frame surface when the lower electric cylinder starts to move downward from the lower electric cylinder's protective demoulding end position to the lower electric cylinder's powder adding position; The suppression calculation method comprises: S1. According to the floating molding pressing method, the floating molding pressing product needs to set the corresponding four operation position parameters, the four operation position parameters are the distance from the lower electric cylinder to the mold frame surface, the distance from the upper electric cylinder to the mold frame surface, the powder height and the product size; S2. According to the requirements of the four operation position parameters, the upper electric cylinder lead and the lower electric cylinder lead are converted into electric cylinder pulses, and the electric cylinder lead distance 1mm is converted into a decimal pulse number. Similarly, the micro-descent height is converted into a decimal pulse number, the orientation distance is converted into a decimal pulse number, and the micro-rise height is converted into a decimal pulse number; S3. According to the calculated decimal pulse data, the floating molding pressing method is completed; The four operation position parameters are set as follows: distance from lower electric cylinder to mold frame surface = D400, distance from upper electric cylinder to mold frame surface = D412, powder adding height = D404, product size = D420; where D is the data register, and each data register D is 16-bit data; According to the lead of the electric cylinder, the electric cylinder pulse is converted to 1mm=K400, the micro-descent height is 10mm, that is, K400×10=K4000, the orientation distance is 10mm, that is, K400×10=K4000, and the micro-lift height is 1mm, that is, K400; K represents decimal, K400 is decimal 400, that is, 1mm=400 pulses, and so on; The lower electric cylinder first moves upward from the initial position to the mold frame surface distance D400, taking this as the reference position, and then moves downward to the powder adding height D404. After adding the NdFeB powder, the lower electric cylinder moves downward again to slightly lower the height K4000. The upper electric cylinder moves downward from the initial position in sequence, the distance from the upper electric cylinder to the mold frame surface is D412, the orientation distance, and the running distance is D416=D412+K4000; Because the lower electric cylinder's slight drop height is equal to the upper electric cylinder's orientation distance, the distance between the upper and lower electric cylinders before floating pressing is equal to the powder adding height. During floating pressing, the upper and lower electric cylinders move relative to each other at the same speed and the running distance is equal. The distance between the upper and lower electric cylinders after floating pressing is the product size D420, so the pressing running distance of the upper and lower electric cylinders D432=(D404-D420) / 2; After the pressing is completed, the upper electric cylinder rises slightly by K400, and the lower electric cylinder starts from the end position of the protective demoulding. The total running distance is the powder adding height + the slight drop height - the floating pressing distance. Therefore, the distance that the upper and lower electric cylinders need to run for the protective demoulding is D440 = D404 + K4000 - D432; After the protective demoulding operation is completed, the upper electric cylinder needs to return to the initial position. Starting from the initial position, the total running distance of the upper electric cylinder is the distance from the upper electric cylinder to the mold frame surface + orientation distance + floating pressing distance - micro-lift distance - protective demoulding distance, so the final distance for the upper electric cylinder to return to the initial position is D456=D416+D432-K400-D440; Among them: D400, D404, D412 and D420 in the above all refer to the register codes, and the specific set values ​​are entered in the registers, which are the data registers in the PLC; the micro-drop height and orientation distance are both input set values ​​of the input data registers, and the unit of the above data register input parameters is mm.

2. According to the pressing calculation method of the floating forming pressing method based on the electric cylinder magnetic field press according to claim 1, it is characterized in that: An initial stage is provided before the powder adding stage. When executing the initial stage task, before the electric cylinder magnetic field press starts floating molding pressing, the upper electric cylinder is located at the upper electric cylinder initial position, the lower electric cylinder is located at the lower electric cylinder initial position, the lower electric cylinder passes through the middle of the mold frame, and the lower electric cylinder runs upward after the lower electric cylinder reaches the mold frame surface distance, and then runs to the lower electric cylinder protection demolding end position. At this time, the top surface of the lower electric cylinder mold is flush with the upper surface of the mold frame.

3. According to the pressing calculation method of the floating forming pressing method based on the electric cylinder magnetic field press according to claim 1, it is characterized in that: After the first floating forming and pressing task is completed, if it is necessary to continue to execute the next action cycle floating forming and pressing task, the next action cycle floating forming and pressing task will be executed from the powder adding stage to the end of the upper electric cylinder rising stage, and the cycle will be executed in this way.

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