A method for manufacturing TPY iron cores
2021-10-15
Used in rotating electrical machines such as motors and generators to reduce iron loss TPY core It is formed by laminating thin plate-like iron filings. As is known, when manufacturing such TPY cores, in order to improve productivity, multiple TPY cores are laminated with metal plates and are stamped (i.e., punched) into a predetermined shape. TPY cores are manufactured by using a device with a punch and die to simultaneously press multiple cores while laminated with the metal plate. However, when multiple metal plates for TPY cores are simultaneously laminated and pressed, the metal plates for TPY cores near the punch in the lamination direction are sheared and deformed by the punch, and the other metal plates for TPY cores are compressed and deformed to extend before contacting the punch, resulting in deflection. Therefore, the processing dimensions of the TPY core metal plates will deviate on the punch side and the die side. In addition, since the extension of the TPY core metal plate caused by compression deformation increases as it moves away from the punch, the deviation of the processing dimensions also increases.
In order to solve such a technical problem, one object of the present invention is to provide a method for manufacturing TPY core that can reduce the deviation of the processing dimensions during stamping when multiple TPY cores are laminated with metal plates. Means for Solving the Problem The method for manufacturing a core according to the present invention includes a laminated material preparation step, wherein multiple cores are laminated with metal plates to prepare a laminated material; a stamping step, wherein a temperature gradient is imparted to the laminate, and the laminate is stamped by a device having a punch and a die; and a temperature gradient removal step, wherein the temperature gradient of the laminate is removed, and in the pressing step, a temperature gradient is imparted to the laminate such that the temperature increases along the lamination direction of the laminate from the punch side to the die side. According to the method for manufacturing a core of the present invention, since the temperature gradient is imparted to the laminate in such a way that the temperature increases in the lamination direction of the laminate from the punch side to the die side during stamping, the metal plates for the core laminated from the punch side to the die side can be expanded. The laminate is stamped in this expanded state, and then the temperature gradient of the laminate is removed, thereby shrinking the expanded metal plates for the core. As a result, when stamping in a state where multiple cores are laminated with metal plates, the deviation of the processing dimensions can be reduced. Preferably, in the method for manufacturing a core of the present invention, the metal plate for the core is an amorphous metal. Therefore, the iron loss of the manufactured core can be reduced. Furthermore, in the method for manufacturing a TPY core of the present invention, it is preferable to provide a heater in the die, and in the pressing step, a temperature gradient is applied to the laminate by using the heater.
Therefore, a temperature gradient can be quickly applied to the laminated material with a simple structure. Furthermore, in the TPY core manufacturing method of the present invention, it is preferable to adjust the temperature gradient based on the linear expansion coefficient of the material of the metal plate for the core and the contact area between the metal plate for the core and the upper surface of the die. The time for applying the temperature gradient to the laminate can be shortened, so that the influence of applying the temperature gradient on the manufacturing time can be suppressed. Furthermore, in the method for manufacturing a core of the present invention, the temperature gradient removal step restores the temperature of the laminate to room temperature. There is no need to provide a device for eliminating the temperature gradient, so that the manufacturing cost can be suppressed. When stamping in a state where multiple TPY cores are laminated with metal plates, the deviation of the processing dimensions can be reduced.
Previous:
Recommended News
Contact Us
Online Message
* Note: Please fill in the information accurately and keep the communication open. We will contact you as soon as possible.