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KR-20260063233-A - Heat fusion device

KR20260063233AKR 20260063233 AKR20260063233 AKR 20260063233AKR-20260063233-A

Abstract

As one aspect for achieving the above-mentioned purpose, the present invention provides a heat fusion device comprising: a first plate; a second plate positioned to face the first plate with a laminate in between; a pressure block positioned on the opposite side of the laminate with at least one of the first plate and the second plate in between; and a connector connecting the first plate, the second plate and the pressure block; wherein the linear expansion coefficient of the pressure block is formed to be greater than the linear expansion coefficient of the laminate.

Inventors

  • 이세일

Assignees

  • 주식회사 포스코

Dates

Publication Date
20260507
Application Date
20241030

Claims (17)

  1. 1st edition; A second plate positioned to face the first plate with a laminate in between; A pressure block disposed on the opposite side of the laminate, with at least one of the first plate and the second plate in between; and A connector connecting the first plate, the second plate, and the pressure block; comprising A heat fusion device in which the linear expansion coefficient of the above-mentioned pressure block is formed to be greater than the linear expansion coefficient of the above-mentioned laminate.
  2. In paragraph 1, the above-mentioned pressure block is, A first pressure block disposed on the opposite side of the laminate with the first plate in between; and A heat fusion device comprising: a second pressure block disposed on the opposite side of the laminate with the second plate in between.
  3. In paragraph 1, the above-mentioned pressure block is, A first pressure block disposed on the opposite side of the laminate with the first plate in between; and A heat fusion device comprising any one of the following: a second pressure block disposed on the opposite side of the laminate with the second plate in between.
  4. In paragraph 1, The above pressure block is spaced apart from the edge portion of the first plate or the second plate on a plane.
  5. In paragraph 1, the above connector is, A connecting bolt installed through the first plate, the second plate, and the pressure block; and A heat fusion device comprising: a connector nut installed at both ends of the connector fixing bolt and fixed to the connector fixing bolt.
  6. In paragraph 1, A thermal fusion device in which the linear expansion coefficient of the above-mentioned pressure block is greater than the linear expansion coefficient of the above-mentioned connector.
  7. In paragraph 1, the above-mentioned pressure block is, A heat fusion device provided with a plurality of layers of pressure block members stacked on either the first plate or the second plate.
  8. In Paragraph 7, A heat fusion device in which at least one of the above-mentioned multiple layers of pressure block members is made of a different material.
  9. In Paragraph 7, At least one of the above-mentioned multiple layers of pressure block members is a heat fusion device having a different thickness.
  10. In paragraph 2 or 3, A heat fusion device satisfying the following equation (1), where the linear expansion coefficients of the first plate and the second plate are denoted as a4-1 and a4-2. [Equation 1] (a⁴-1 + a⁴-2) /2 > 10× 10⁻⁶ mm/mm
  11. In paragraph 2, A heat fusion device satisfying the following equation (2), where the thickness of the above laminate is h5, the linear expansion coefficient of the above laminate is a5, the thicknesses of the first pressure block and the second pressure block are h3-1 and h3-2, and the linear expansion coefficients of the first pressure block and the second pressure block are a3-1 and a3-2. [Equation 2] (a3-1×h3-1 + a3-2×h3-2) /40 < a5×h5 (a3-1×h3-1 + a3-2×h3-2) /10
  12. In paragraph 2 or 3, A heat fusion device satisfying the following equation (3), where the Young's modulus of the first plate and the second plate is E4-1 and E4-2, and the average of the two is E4avg, and the Young's modulus of the laminate is E5. [Equation 3] 5 > E4avg / E5 > 0.2
  13. In paragraph 2, A heat fusion device satisfying the following equation (4), where the Young's moduli of the first plate and the second plate are E4-1 and E4-2, and the Young's moduli of the first pressure block and the second pressure block are E3-1 and E-2, and the average of E4-1 and E4-2 is E4avg and the average of E3-1 and E3-2 is E3avg. [Equation 4] 5 > E4avg/E3avg > 0.2
  14. In paragraph 2, A heat fusion device satisfying the following equations (5) and (6), where the thicknesses of the first pressure block and the second pressure block are h3-1 and h3-2, the thicknesses of the first plate and the second plate are h4-1 and h4-2, and the thickness of the laminate is h5. [Equation 5] h4-1 + h4-2 > 10 mm, [Equation 6] (h3-1 + h3-2)/h5 > 0.05
  15. In paragraph 2 or 3, A heat fusion device satisfying the following equation (7), where the thicknesses of the first plate and the second plate are h4-1 and h4-2. [Equation 7] 0.25 < h4-1 / h4-2 < 4
  16. In paragraph 1, The above laminate is a thermal fusion device provided as an iron core structure for an electrical device core in which multiple layers of bonded steel plates are laminated by thermal fusion.
  17. A heat fusion method using a heat fusion device described in any one of claims 1 to 9, and A stacking step of arranging the stack between the first plate and the second plate, arranging the pressure block on the opposite side of the stack with at least one of the first plate and the second plate in between, and the connecting body connecting the first plate, the second plate and the pressure block; and A heat fusion method comprising: a lamination fusion step of heating the lamination and the heat fusion device, and applying pressure to the lamination using a pressure block to bond the lamination.

Description

Heat fusion device The present invention relates to a thermal fusion device for laminates. It should be noted that the content described in this section merely provides background information regarding the present invention and does not constitute prior art. Iron cores for motors or generators are formed by creating a specific shape through stamping and stacking them to form a core, while iron cores for transformers are formed by creating a relatively simple shape through cutting and stacking them to form a core. Therefore, a laminated structure is required by stacking and joining multiple steel plates. Until now, laminated structures have been fabricated through welding, clamping, and interlocking, but recently, self-bonding fusion technology has become known, which involves applying heat and pressure to bonding steel plates to create a thermal fusion. For example, bonding steel plates coated with a coating material having insulating and fusion properties are punched or cut and stacked to form a laminated structure, heated to a constant temperature, and bonded by applying a constant pressure. In order to manufacture the laminated structure, it is necessary to heat the bonding reaction to a temperature at which the bonding reaction occurs and to apply pressure to promote the bonding reaction. Therefore, a device (jig) for thermal fusion is used when manufacturing laminated structures such as iron core structures for motor cores. For example, KR 10-2020-0076495 A (June 29, 2020) discloses a heat-fusion type steel plate bonding device for a motor core that can bond multiple steel plates by applying continuous pressure when bonding steel plates for manufacturing a motor core. However, the above-mentioned conventional technology had problems such as the fact that, in addition to the two plates that compress the laminated structure, a separate spring and a separate additional plate were essential, making the overall structure of the device (jig) complex, making it difficult to apply automation, increasing facility costs, and making it difficult to manufacture large structures. Therefore, there has been a demand for improved technology that enables simplified thermal fusion while maintaining the quality of laminated structures and allowing them to be integrated into automated processes. FIG. 1 is a perspective view of a heat fusion device according to one embodiment of the present invention. Figure 2 is a front view of the heat fusion device of Figure 1. FIG. 3 is a front view of a heat fusion device according to another embodiment of the present invention. FIG. 4 is a front view of a heat fusion device according to another embodiment of the present invention. FIGS. 5a to 5d are drawings illustrating enlarged details of various embodiments of a pressure block installed in part 'A' of FIG. 2. FIGS. 6a to 6c are drawings illustrating enlarged details of various embodiments of a pressure block installed in part 'A' of FIG. 2. FIGS. 7a and 7b are conceptual diagrams for measuring the coefficient of linear expansion of a laminate placed in the thermal fusion device of the present invention and other materials of the thermal fusion device of the present invention. Preferred embodiments of the present invention will be described below with reference to the attached drawings. However, embodiments of the present invention may be modified in various different forms, and the scope of the present invention is not limited to the embodiments described below. Furthermore, embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art. In the drawings, the shapes and sizes of elements may be exaggerated for clearer explanation. In describing the embodiments of the present invention, if it is determined that a detailed description of known technology related to the present invention may unnecessarily obscure the essence of the present invention, such detailed description will be omitted. Furthermore, the terms described below are defined considering their functions in the present invention, and these may vary depending on the intentions or conventions of the user or operator. Therefore, such definitions should be based on the content throughout this specification. The terms used in the detailed description are merely for describing the embodiments of the present invention and should not be limited in any way. Unless explicitly stated otherwise, expressions in the singular form include the meaning of the plural form. In this description, expressions such as “include” or “equipped” are intended to refer to certain characteristics, numbers, steps, actions, elements, parts or combinations thereof, and should not be interpreted to exclude the existence or possibility of one or more other characteristics, numbers, steps, actions, elements, parts or combinations thereof other than those described. In this specification, terms such as 'top', 'upper', 'upper surface', 'lower', 'lo