CN-121983419-A - Forming device and forming method for realizing neodymium-iron-boron space oblique orientation through multi-axis linkage

CN121983419ACN 121983419 ACN121983419 ACN 121983419ACN-121983419-A

Abstract

The invention discloses a forming device and a forming method for realizing neodymium iron boron space oblique orientation through multi-axis linkage, wherein the forming device comprises a female die and a magnetizing coil, the magnetizing coil is arranged on the outer side of the female die, a cavity is arranged in the female die, the cavity is of an oblique hexahedral structure with a parallelogram cross section, the upper end face and the lower end face of the cavity are respectively positioned on the upper end face and the lower end face of the female die, the sizes of the upper end face and the lower end face of the cavity are identical, an included angle between one side of the cross section of the cavity along the X axis direction and the orientation direction of an orientation magnetic field is equal to an orientation angle design value of a pressed blank in the X axis direction, an included angle between the other side of the cross section of the cavity along the Y axis direction and the orientation direction of the orientation magnetic field is equal to an orientation angle design value of the pressed blank in the Y axis direction, a central connecting line of the upper end face and the lower end face of the cavity is obliquely arranged relative to the Z axis direction of the three-dimensional coordinate system, the inclination angle of the upper end face and the inclined angle of the upper end face of the cavity is equal to an orientation angle design value of the pressed blank in the Z axis direction of the three-dimensional coordinate system, and the advantage of the finished product yield can be improved.

Inventors

LU WEIFENG
LIU FENG
ZHANG WEI
LIU XIAOFENG

Assignees

包头韵升科技发展有限公司
包头韵升强磁材料有限公司
宁波韵升股份有限公司
宁波韵升磁体元件技术有限公司

Dates

Publication Date: 20260505
Application Date: 20251219

Claims (4)

1. A forming device for realizing neodymium iron boron space oblique orientation through multi-axis linkage comprises a female die and a magnetizing coil, wherein the magnetizing coil is arranged on the outer side of the female die and is used for providing an orientation magnetic field, a cavity is arranged in the female die, the cavity is of an oblique hexahedral structure with a parallelogram cross section, the upper end face and the lower end face of the cavity are respectively positioned on the upper end face and the lower end face of the female die, the sizes of the upper end face and the lower end face are identical, the left and rear top point of the bottom face of the cavity is taken as an origin, the straight lines of the bottom face of the cavity, which is started from the top point, are respectively taken as an X axis and a Y axis, and the straight lines, which are vertically upwards extended from the top point and are perpendicular to the X axis and the Y axis, are taken as Z axes, in a three-dimensional coordinate system is constructed, the included angle between one side of the cross section of the cavity along the X axis and the orientation magnetic field is equal to the design value of the orientation angle of the compact in the X axis, the included angle between the other side along the Y axis and the orientation direction is equal to the design value of the orientation angle of the compact in the Y axis, and the three-dimensional coordinate system is set to the three-dimensional coordinate system of the orientation angle of the compact in the Z axis.
2. The molding device for realizing the neodymium iron boron space oblique orientation through multi-axis linkage according to claim 1 is characterized by further comprising a control system, an upper press head, a lower press head, an upper sliding table, a lower sliding table, an upper pressure sensor, a lower pressure sensor, an upper hydraulic cylinder, a lower hydraulic cylinder and a mold frame, wherein the upper sliding table, the lower sliding table, the upper pressure sensor, the lower pressure sensor, the upper hydraulic cylinder and the lower hydraulic cylinder are respectively connected with the control system, the female mold is fixed above the mold frame, a channel for the lower press head to enter the cavity is arranged on the mold frame, the outline dimensions of the upper press head and the lower press head are matched with the cavity, the lower press head is arranged on the lower sliding table, the lower sliding table is used for adjusting the position of the lower press head in the horizontal plane under the control of the control system so as to enable the lower press head to be aligned with the cavity, the lower sliding table is arranged on the lower hydraulic cylinder, the lower hydraulic cylinder is used for controlling the lower pressure sensor to drive the lower press head to move along the control system, the lower press head is arranged on the lower pressure head to be arranged on the control system, the upper sliding table is used for driving the lower press head to enter the cavity to the control system to the horizontal plane, the upper pressure head is arranged on the control system to enable the lower press head to be aligned with the upper pressure head to the cavity, the upper sliding table is arranged on the control system to be aligned with the horizontal plane, the upper pressure sensor is arranged on the upper sliding table is used for driving the upper pressure sensor to be aligned with the horizontal plane.
3. A molding method of a molding device for realizing neodymium iron boron space oblique orientation by multi-axis linkage according to any one of claims 1 to 2, comprising the following steps: Step 1, controlling the lower sliding table and the lower hydraulic cylinder through the control system, enabling the lower pressure head to pass through a channel at the die frame according to a preset speed and a preset path, and entering a preset initial position in the die cavity from the bottom of the die cavity so as to support neodymium iron boron powder in the die cavity; step 2, filling neodymium iron boron powder with preset weight into the cavity; Step 3, the magnetizing coil is connected with a power supply, the power supply is started to supply power to the magnetizing coil, the magnetizing coil generates a space magnetic field completely consistent with the target magnetizing direction, the neodymium iron boron powder in the cavity is magnetized, and meanwhile the neodymium iron boron powder is pressed to obtain a pressed compact, and the power supply is turned off when the magnetizing is completed in the pressing process; the pressing concrete process comprises the steps of controlling the upper sliding table and the upper hydraulic cylinder through the control system, driving the upper pressing head to move downwards into the cavity according to a preset speed and a preset path, pressing neodymium iron boron powder downwards, controlling the lower sliding table and the lower hydraulic cylinder through the control system, driving the lower pressing head to move upwards according to the preset speed and the preset path, pressing neodymium iron boron powder upwards, in the process, collecting the pressure of the upper pressing head in real time by the upper pressure sensor, feeding back the pressure of the lower pressing head to the control system, collecting the pressure of the lower pressing head in real time by the lower pressure sensor, comparing the pressure of the upper pressing head with the pressure of the lower pressing head, if the deviation of the pressure of the upper pressing head and the pressure of the lower pressing head is within 5%, keeping the current moving speed of the upper pressing head and the lower pressing head unchanged, and if the deviation of the pressure of the upper pressing head and the lower pressing head is outside 5%, adjusting the moving speed of the upper pressing head to enable the deviation of the upper pressing head and the upper pressing head to be within 5%, and forming a pressed blank after the upper pressing head and the lower pressing head reach the preset position; Step 4, switching on the power supply again to supply power to the magnetizing coil, wherein the magnetizing coil generates a magnetic field to demagnetize the pressed compact, and switching off the power supply after demagnetization is finished; Step 5, keeping the current state unchanged for 4-5 seconds, and maintaining the pressure; Step 6, controlling the upper sliding table and the upper hydraulic cylinder through the control system, driving the upper pressing head to move upwards obliquely according to a preset speed and a preset path, and simultaneously controlling the lower sliding table and the lower hydraulic cylinder through the control system, driving the lower pressing head to move upwards obliquely according to the preset speed and the preset path, clamping the pressed compact by the upper pressing head and the lower pressing head, and driving the pressed compact to move upwards obliquely until the pressed compact is moved out of the cavity; And 7, controlling the upper sliding table and the upper hydraulic cylinder through the control system, driving the upper pressing head to reset, and at the same time, manually taking out the pressed compact.
4. The molding method of the molding device for realizing the neodymium iron boron space oblique orientation by multi-axis linkage according to claim 3, wherein in the step 2, neodymium iron boron powder with the granularity of 3-5.5 μm is filled into the cavity through a feeding pipe, a vibrator is started to vibrate the female mold in the process, so that the loose density deviation of the neodymium iron boron powder is prevented, and the amplitude of the vibrator is 0.1mm.

Description

Forming device and forming method for realizing neodymium-iron-boron space oblique orientation through multi-axis linkage Technical Field The invention relates to a neodymium-iron-boron space oblique orientation technology, in particular to a forming device and a forming method for realizing neodymium-iron-boron space oblique orientation through multi-axis linkage. Background With the rapid development of communication technology, 3C consumer electronics, such as mobile phones, computers, and wireless communication devices, are becoming the emerging industry with the fastest development speed and the most growing potential. The 3C consumer electronics products mainly include six major categories, smart phones, tablet computers, notebook computers, smartwatches, headphones, and wireless charging devices, examples being apple company's products, including iPhone, iPad, mac-Book, APPLE WATCH, airPods, and MagSafe accessories. Three main modules in these 3C consumer electronics products are magnets, respectively an acoustic module, a vibration motor module and a magnetic accessory module. The special-shaped magnet refers to a magnet with irregular shape or special design. Compared with the traditional round or square magnet, the special-shaped magnet is more flexible in design, can be customized according to specific application requirements, can better adapt to the design shape of various 3C consumer electronic products, is generally made of high-performance permanent magnet materials, has excellent magnetic performance and stability, and is widely applied to various industries and fields at present. In the equipment with limited space, miniaturization, light weight and thinness are trends of the current 3C consumer electronic products, and the special-shaped magnet can be designed into a proper shape so as to achieve the light weight and thinness design by utilizing space. The compact of the shaped magnet needs to be obliquely oriented during the forming process. As shown in fig. 1 and 2, the existing forming device for realizing the neodymium iron boron space oblique orientation mainly comprises a female die 1, an upper pressing head 2, a lower pressing head 3, a magnetizing coil 4, an upper hydraulic cylinder 5, a lower hydraulic cylinder 6 and a die frame 7, wherein the female die 1 is fixed above the die frame 7, a cavity 8 penetrating up and down is arranged in the female die 1, the lower pressing head 3 can penetrate through the die frame 7 to enter the bottom of the cavity 8 under the driving of the lower hydraulic cylinder 6, the powder in the cavity 8 is supported, the lower pressing head 3 can enter the cavity 8 from the top of the cavity 8 under the driving of the upper hydraulic cylinder 5, the powder in the lower pressing head is pressed to form a pressed compact, the magnetizing coil 4 is arranged on the outer side of the female die 1, and an orientation magnetic field is provided, wherein the orientation direction M is the left-right direction of a horizontal plane and is used for orienting the powder in the cavity 8. In the development process of the neodymium iron boron magnet forming process, powder feeding modes of the neodymium iron boron magnet forming process are all vertical falling into a cavity, and the axis of the cavity is the optimal choice capable of ensuring the falling of powder along the vertical direction. The forming device for realizing the neodymium iron boron space oblique orientation is evolved from the forming device of the magnet with the conventional symmetrical structure, so that the forming device still keeps the axis of the cavity along the vertical direction, and the cross section of the conventional cavity is changed from a rectangle to a parallelogram. As shown in fig. 3 and fig. 4, when designing the cavity, the left and rear vertexes of the bottom surface of the cavity are taken as the origins, the straight lines of the bottom surface of the cavity, which are from the vertexes, are respectively taken as the X axis and the Y axis, the straight lines extending vertically upwards from the vertexes are taken as the Z axis, and the Z axis is respectively perpendicular to the X axis and the Y axis, so as to construct a three-dimensional coordinate system, and the three-dimensional coordinate system is the orientation coordinate system. In the orientation coordinate system, an included angle alpha between one side of the cross section of the cavity along the X-axis direction and the orientation direction M is equal to an orientation angle design value of the pressed compact along the X-axis direction, and an included angle beta between the other side along the Y-axis direction and the orientation direction M is equal to an orientation angle design value of the pressed compact along the Y-axis direction. Because the included angle between the edge of the die cavity along the Z-axis direction and the orientation direction M is 90 degrees, the orientation angle of the pr