Heat fusion device

Abstract

To this end, an aspect of the present invention provides a thermal fusion device comprising: a first plate; a second plate disposed to face the first plate with a laminate interposed therebetween; a pressing block disposed opposite the laminate with at least one of the first plate and the second plate interposed therebetween; and a connector for fastening the first plate, the second plate, and the pressing block. The coefficient of linear expansion of the pressing block is greater than the coefficient of linear expansion of the laminate.

Description

Thermal fusion device

[0001] The present invention relates to a thermal fusion device for laminates.

[0002] 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.

[0003] 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.

[0004] 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.

[0005] 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.

[0006] 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.

[0007] 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.

[0008] (Patent Document 1) KR 10-2020-0076495 A

[0009] In one aspect, the present invention aims to provide a thermal fusion device that enables efficient thermal fusion of laminates with a simplified device, has good laminate quality, facilitates the automation of the device, and allows for cost reduction.

[0010] The problems of the present invention are not limited to those described above. A person skilled in the art to which the present invention pertains will have no difficulty understanding additional problems of the present invention from the overall contents of this specification.

[0011] 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.

[0012] The thermal fusion device of the present invention enables efficient thermal fusion of laminates with a simplified device, provides good lamination quality, facilitates the automation of the device, and offers the effect of cost reduction.

[0013] The above pressure block may include: a first pressure block positioned on the opposite side of the laminate with the first plate in between; and a second pressure block positioned on the opposite side of the laminate with the second plate in between.

[0014] The above pressure block may include any one of: a first pressure block positioned on the opposite side of the laminate with the first plate in between; and a second pressure block positioned on the opposite side of the laminate with the second plate in between.

[0015] The above pressure block may be spaced apart from the edge portion of the first plate or the second plate on a plane.

[0016] The above connector may include: a connector fixing bolt installed through the first plate, the second plate, and the pressure block; and a connector nut installed at both ends of the connector fixing bolt and fixed to the connector fixing bolt.

[0017] The linear expansion coefficient of the above-mentioned pressure block may be greater than the linear expansion coefficient of the above-mentioned connector.

[0018] The above pressure block may be provided by stacking multiple layers of pressure block members on either the first plate or the second plate.

[0019] At least one of the above multiple layers of pressure block members may have a different material.

[0020] At least one of the above multiple layers of pressure block members may have a different thickness.

[0021] When the linear expansion coefficients of the first plate and the second plate are denoted as a4-1 and a4-2, the following equation (1) can be satisfied.

[0022] [Equation 1] (a⁴-1 + a⁴-2) / 2 > 10×10 -6 mm / mm

[0023] When the thickness of the above-mentioned laminate is h5, the linear expansion coefficient of the above-mentioned 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, the following equation (2) can be satisfied.

[0024] [Formula 2] (a3-1×h3-1 + a3-2×h3-2) / 80 < a5×h5 < (a3-1×h3-1 + a3-2×h3-2) / 10

[0025] When the Young's moduli of the first plate and the second plate are set to E4-1 and E4-2, and the arithmetic mean of E4-1 and E4-2 is set to E4avg, and the Young's moduli of the laminate is set to E5, the following equation (3) can be satisfied.

[0026] [Equation 3] 5 > E4avg / E5 > 0.2

[0027] When the Young's modulus of the first plate and the second plate is E4-1, E4-2, and the average of E4-1 and E4-2 is E4avg, and the Young's modulus of the first pressure block and the second pressure block is E3-1, E-2, and the average of E3-1 and E3-2 is E3avg, the following equation (4) can be satisfied.

[0028] [Equation 4] 5 > E4avg / E3avg > 0.2

[0029] When 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, the following equations (5) and (6) can be satisfied.

[0030] [Equation 5] h4-1 + h4-2 > 10 mm,

[0031] [Equation 6] (h3-1 + h3-2) / h5 > 0.05

[0032] When the thicknesses of the first plate and the second plate are denoted as h4-1 and h4-2, the following equation (7) can be satisfied.

[0033] [Equation 7] 0.25 < h4-1 / h4-2 < 4

[0034] 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.

[0035] As another aspect for achieving the above-mentioned purpose, the present invention provides a heat fusion method using the aforementioned heat fusion device, comprising: a heat fusion method

[0036] According to one embodiment of the present invention, a laminate can be efficiently heat-fused using a simplified device, the laminate quality is good, the device can be easily automated, and cost reduction is possible.

[0037] FIG. 1 is a perspective view of a heat fusion device according to one embodiment of the present invention.

[0038] Figure 2 is a front view of the heat fusion device of Figure 1.

[0039] FIG. 3 is a front view of a heat fusion device according to another embodiment of the present invention.

[0040] FIG. 4 is a front view of a heat fusion device according to another embodiment of the present invention.

[0041] FIGS. 5a to 5d are drawings illustrating enlarged details of various embodiments installed in part 'A' of FIG. 2.

[0042] FIGS. 6a to 6c are drawings illustrating enlarged details of various embodiments of a pressure block installed in part 'A' of FIG. 2.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] In this specification, terms such as 'top', 'upper', 'upper surface', 'lower', 'lower', 'lower surface', 'side', etc. are based on the drawings and may actually vary depending on the direction in which the elements or components are arranged.

[0048] Additionally, throughout the specification, when it is said that one part is 'connected' to another part, this includes not only cases where they are 'directly connected,' but also cases where they are 'indirectly connected' with other elements in between.

[0049] The present invention will be described in detail below through each embodiment or example of the invention. It should be noted that each embodiment or example described in this specification is not limited to a single embodiment or example, but may also be combined with other embodiments or examples. Accordingly, the citation of claims in the patent claims is merely an example of an embodiment, and the technical concept of the present invention should not be interpreted as being limited only to a combination with the cited claims; rather, combinations with various claims are also included within the scope of the technical concept of the present invention.

[0050] The present invention will be described in detail below through examples. However, it should be noted that the examples described below are intended only to illustrate and embody the present invention and are not intended to limit the scope of the present invention. This is because the scope of the present invention is determined by the matters described in the patent claims and matters reasonably inferred therefrom.

[0051] Referring to the drawings, the heat fusion device of the present invention is illustrated in the front-rear direction (X), left-right direction (Y), and up-down direction (Z). In the detailed description of the invention, the terms front-rear direction (X), left-right direction (Y), and up-down direction (Z) have also been used for explanation. However, this is for convenience of explanation, and it should be noted that the technical features of the heat fusion device of the present invention are not limited to these directions.

[0052] In the following, the X-axis shown in the attached drawing is the front-rear direction (X) of the heat fusion device, the Y-axis is the left-right direction (Y) of the heat fusion device, and the Z-axis is the up-down direction (Z) of the heat fusion device.

[0053] The laminate (S) of the present invention may be provided as an iron core structure for an electrical device core in which a plurality of layers of bonding steel plates (Sa) are laminated by thermal fusion. For example, the laminate (S) of the present invention may be an iron core for a motor or generator core, or a laminate (S) of an electronic track structure.

[0054] However, in the following embodiment, the laminate (S) of the present invention is described as a steel plate laminate (S) in which multiple layers of bonding steel plates (Sa), such as iron cores for motors or generator cores, are laminated and fused. Of course, it is not necessarily limited thereto.

[0055] Next, the heat fusion device of the present invention may be provided in a form in which a pressure block (50) is compressed while supplementing the pressure on the first plate (10) and the second plate (30) as shown in FIGS. 1 to 4, and the laminate (S) between the first plate (10) and the second plate (30) may be fixed in a relative position perpendicular to the bonding surface of the laminate (S) through a connector fixing bolt (71) and a connector nut (73) while being compressed at a temperature of 100 degrees (°C) or lower.

[0056] In addition, when the first plate (10), second plate (30), laminate (S), and pressure block (50) of the heat fusion device of the present invention are heated, linear expansion (thermal expansion) occurs in the first plate (10), second plate (30), laminate (S), and pressure block (50) arranged at different relative positions, and in the connector (70) to which they are properly fixed, thereby generating pressure on the vertical surface of the laminate (S).

[0057] Accordingly, in the case of the thermal fusion device according to the present invention, as described in detail below, a pressure force can be applied to the laminate (S) in a heated environment based on a pressure block (50) having a large coefficient of linear expansion. Specifically, the thermal fusion device according to the present invention can apply a large pressure force to the laminate (S) in a heated environment in which the coefficient of linear expansion of the pressure block (50) is greater than the coefficient of linear expansion of the steel plate laminate (S).

[0058] As a result, the thermal fusion device of the present invention can have a much larger pressure applied to the steel plate laminate (S) at a high temperature where actual bonding of the steel plate (Sa) occurs than the pressure applied to the steel plate laminate (S) at room temperature.

[0059] Accordingly, in the heat fusion device for a steel plate laminate (S) of the present invention, as the temperature increases, the pressure applied to the laminate (S) of the pressure block (50) increases more than that applied to the steel plate laminate (S), so the steel plate laminate (S) can be bonded more strongly.

[0060] In addition, within the range satisfying the various conditional equations described in detail below, the thermal fusion of the steel plate laminate (S) is performed more smoothly, so that the steel plate laminate (S) is fastened with high fastening force and the shape quality of the steel plate laminate (S) can also be made excellent.

[0061] Hereinafter, with reference to FIGS. 1 to 4, the components included in a heat fusion device according to one embodiment of the present invention will be described in detail.

[0062] FIG. 1 is a perspective view of a heat fusion device according to one embodiment of the present invention. FIG. 2 is a front view of the heat fusion device of FIG. 1.

[0063] 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 yet another embodiment of the present invention.

[0064] Referring to FIGS. 1 to 4, a heat fusion device according to one embodiment of the present invention may include a first plate (10), a second plate (30), a pressure block (50), and a connector (70).

[0065] The second plate (30) can be positioned to face the first plate (10) with the laminate (S) in between.

[0066] The first plate (10) and the second plate (30) can be arranged in a manner that stacks and presses the laminate (S). Referring to FIG. 2, when the first plate (10) is placed on the upper part of the laminate (S), the second plate (30) can be placed on the lower part of the laminate (S).

[0067] For example, the first plate (10) and the second plate (30) may be made of steel plates. As another example, either the first plate (10) or the second plate (30) may be made of steel plates, and the other may be made of aluminum plates.

[0068] The pressure block (50) may be positioned on opposite sides of the laminate (S), with at least one of the first plate (10) and the second plate (30) in between. The pressure block (50) may be positioned so as to be in close contact with the first plate (10) or the second plate (30).

[0069] When the pressure block (50) is heated above a set temperature, it can apply pressure to the laminate (S). For example, when heated to a high temperature of 140 degrees or higher, the pressure block (50) can compress the first plate (10) and the laminate (S), or compress the second plate (30) and the laminate (S).

[0070] The first pressure block (50-1) can apply pressure to the laminate (S) through the first plate (10) to compress the laminate (S). The second pressure block (50-2) can apply pressure to the laminate (S) through the second plate (30) to compress the laminate (S).

[0071] The pressure block (50) can be spaced apart from the edge portion of the first plate (10) or the second plate (30) on a plane.

[0072] The pressure block (50) may be placed on the edge portion of the first plate (10) or the second plate (30) on a plane (X-axis-Y-axis plane). The pressure block (50) may not be installed in the central area of ​​the first plate (10) or the second plate (30) on a plane (X-axis-Y-axis plane).

[0073] For example, the pressure block (50) may be spaced apart in the left-right direction (Y) to press the first plate (10) or the second plate (30). The pressure block (50) may not be installed in the left-right direction (Y) central area of ​​the first plate (10) or the second plate (30). The pressure block (50) may be spaced apart in the front-back direction (X) to press the first plate (10) or the second plate (30). The pressure block (50) may not be installed in the front-back direction (X) central area of ​​the first plate (10) or the second plate (30).

[0074] The connector (70) can connect the first plate (10), the second plate (30), and the pressure block (50).

[0075] Referring to FIGS. 1 to 4, the connector (70) may include a connector fixing bolt (71) and a connector nut (73).

[0076] The connecting fixing bolt (71) can be installed by penetrating the first plate (10), the second plate (30), and the pressure block (50).

[0077] The connector fixing bolt (71) can be installed by penetrating the pressure block (50), and the pressure block (50) can apply pressure to the stack (S) along the longitudinal direction (upward / downward direction (Z)) of the connector fixing bolt (71).

[0078] The connector nut (73) is installed at both ends of the connector fixing bolt (71) and can be fixed to the connector fixing bolt (71). The first plate (10), the second plate (30), and the pressure block (50) can be connected via the connector fixing bolt (71) and the connector nut (73).

[0079] The linear expansion coefficient of the pressure block (50) can be formed to be greater than the linear expansion coefficient of the laminate (S).

[0080] By configuring the linear expansion coefficient of the pressure block (50) to be greater than the linear expansion coefficient of the laminate (S), the pressure block (50) can apply pressure to the laminate (S).

[0081] When heat is applied to the heat fusion device and the steel plate laminate (S) of the present invention, the linear expansion coefficient of the pressure block (50) is greater than the linear expansion coefficient of the steel plate laminate (S) in which multiple layers of bonded steel plates (Sa) are stacked, so it can expand linearly as it is heated. Accordingly, the pressure block (50) with a large linear expansion coefficient applies pressure to the steel plate laminate (S) with a relatively small linear expansion coefficient, and as a result, the heat fusion of the steel plate laminate (S) can be implemented even with a simple device structure.

[0082] The relationship between the linear expansion coefficients of the pressure block (50) and the steel plate laminate (S) will be explained in more detail later.

[0083] In an exemplary manner, the heating time until the surface measurement temperature of the steel plate laminate (S) reaches 200 degrees is 30 minutes, the holding time at 200 degrees is 10 minutes, and the cooling time to 120 degrees is 40 minutes.

[0084] The heat treatment was performed in an atmospheric environment and heated using hot air. After cooling, the steel plate laminate (S) was removed from the device, and the fastening force was measured. The fastening force can be evaluated by applying structural adhesive to the upper and lower surfaces of the steel plate laminate (S) and attaching column sections to both sides to apply force. After fixing these column sections using the gripping device of a tensile testing machine, the maximum force just before the steel plate laminate (S) separates is applied to the steel plate laminate (S). The stress value obtained by dividing this maximum force by the cross-sectional area of ​​the steel plate laminate (S) was calculated and evaluated as the fastening force per unit area.

[0085] The steel plate laminate (S) can be produced by heating to 180 degrees within a time range of 60 minutes (excluding 0), maintaining the temperature above 180 degrees for at least 1 minute, ensuring that the maximum temperature inside the steel plate laminate (S) does not reach 300 degrees during the holding time, or if it does, it is within 1 minute, and then cooling through a cooling process to a temperature of 120 degrees or lower for at least 3 minutes.

[0086] The fastening force for the steel plate laminate (S) is the stress value obtained by dividing the maximum force generated when the structure is stably mounted on a tensile testing machine so as not to make physical contact with at least 20 bonding layers inside the steel plate laminate (S) and the test is performed by pulling the tensile axis in the vertical direction of the laminate surface by the contact surface area of ​​one layer of the laminate (S).

[0087] At this time, it is also possible to use a hydraulic chuck to mount the structure to the tensile testing machine, or to attach handles using structural adhesive to the top and bottom surfaces of the laminate (S) and test it by tensile testing.

[0088] Referring to FIGS. 1 and FIGS. 2, the pressure block (50) may include a first pressure block (50-1) and a second pressure block (50-2).

[0089] The first pressure block (50-1) can be placed on the opposite side of the laminate (S) with the first plate (10) in between. The first pressure block (50-1) can be placed between the first plate (10) and the connecting nut (73). The first pressure block (50-1) can be placed in close contact with the first plate (10).

[0090] The second pressure block (50-2) can be placed on the opposite side of the laminate (S) with the second plate (30) in between. The second pressure block (50-2) can be placed between the second plate (30) and the connecting nut (73). The second pressure block (50-2) can be in close contact with the second plate (30).

[0091] The first pressure block (50-1) may be positioned between the first plate (10) and the connector nut (73), and the second pressure block (50-2) may be positioned between the second plate (30) and the connector nut (73). For example, the connector fixing bolt (71) may be directly fixed to the first pressure block (50-1) and the second pressure block (50-2).

[0092] At this time, the first pressure block (50-1) and the second pressure block (50-2) are fixed to the connector fixing bolt (71), and while the movement of the first pressure block (50-1) and the second pressure block (50-2) may be restricted around the connector fixing bolt (71), the first pressure block (50-1) and the second pressure block (50-2) can move while expanding linearly at the edge portion, thereby performing the role of a pressure block (50).

[0093] Referring to FIGS. 3 and 4, the pressure block (50) may include either a first pressure block (50-1) and a second pressure block (50-2).

[0094] For example, referring to FIG. 3, it may include a first pressure block (50-1) and not include a second pressure block (50-2).

[0095] The first pressure block (50-1) can be positioned on the opposite side of the stack (S) with the first plate (10) in between. The first pressure block (50-1) can be positioned between the first plate (10) and the connector nut (73). For example, the connector fixing bolt (71) can be directly fixed to the first plate (10) or the first pressure block (50-1).

[0096] For example, when the connector fixing bolt (71) is fixed to the first plate (10) where the pressure block (50) is not placed, the connector fixing bolt (71) can be fixed by bolting it to the first plate (10). As another example, when the connector fixing bolt (71) is fixed to the first plate (10) where the pressure block (50) is not placed, the connector fixing bolt (71) can be fixed to the first plate (10) by welding.

[0097] As another example, referring to FIG. 4, it may include a second pressure block (50-2) and not include a first pressure block (50-1).

[0098] The second pressure block (50-2) can be positioned on the opposite side of the stack (S) with the second plate (30) in between. The second pressure block (50-2) can be positioned between the second plate (30) and the connector nut (73). For example, the connector fixing bolt (71) can be directly fixed to the second plate (30) or the second pressure block (50-2).

[0099] For example, when the connector fixing bolt (71) is fixed to the second plate (30) where the pressure block (50) is not placed, the connector fixing bolt (71) can be fixed by bolting it to the second plate (30). As another example, when the connector fixing bolt (71) is fixed to the second plate (30) where the pressure block (50) is not placed, the connector fixing bolt (71) can be fixed to the second plate (30) by welding.

[0100] The linear expansion coefficient of the pressure block (50) may be greater than the linear expansion coefficient of the connector (70). Accordingly, the pressure block (50) can compress the first plate (10) or the second plate (30) while installed on the connector (70), and can compress the laminate (S) through the first plate (10) or the laminate (S) through the second plate (30).

[0101] FIGS. 5a to 5d are drawings illustrating enlarged details of various embodiments installed in part 'A' of FIGS. 2. FIGS. 5a to 5d illustrate various embodiments installed on the side of the first plate (10), but it is obvious that they can also be applied to various embodiments installed on the side of the second plate (30).

[0102] Referring to FIGS. 5a to 5d, the pressure block (50) may be composed of a single pressure block (50) on either the first plate (10) or the second plate (30).

[0103] For example, referring to FIG. 5a, the pressure block (50) can be in direct contact with the first plate (10) and the connecting nut (73). The pressure block (50) can be positioned outside the area where the stack (S) is installed, based on the left-right direction (Y).

[0104] As another example, referring to FIG. 5b, a portion of the pressure block (50) may be placed across the area where the stack (S) is installed with respect to the left-right direction (Y). Specifically, a portion of the pressure block (50) may be placed to overlap the first plate (10) and the stack (S) in the up-down direction (Z).

[0105] Referring to FIG. 5c, the pressure block (50) can be in direct contact with the first plate (10), and a washer (W) can be installed between the pressure block (50) and the connecting nut (73).

[0106] Referring to FIG. 5d, a washer (W) may be installed between the pressure block (50) and the first plate (10), and a washer (W) may be installed between the pressure block (50) and the connector nut (73). In FIG. 5c and FIG. 5d, if the washer (W) is made of a material having a Young's modulus and a thermal expansion constant that differ from any one of the materials of the pressure block (50), the connector nut (73), the first plate (10), and the laminate (S) by less than 50%, the use of the washer (W) is hardly affected by the pressure force and can be omitted from the specific configuration of the invention.

[0107] FIGS. 6a to 6c are drawings illustrating enlarged details of various embodiments of a pressure block (50) installed in part 'A' of FIGS. 2. FIGS. 6a to 6c illustrate various embodiments of a first pressure block (50-1) installed on the side of the first plate (10), but it is obvious that these various embodiments can also be applied to a second pressure block (50-2) installed on the side of the second plate (30).

[0108] Referring to FIGS. 6a to 6c, the pressure block (50) may be provided by stacking multiple layers of pressure block members (50a) on either the first plate (10) or the second plate (30).

[0109] The pressure block (50) may be provided in multiple layers by stacking multiple pressure block members (50a) in the vertical direction (Z). The pressure block (50) composed of multiple layers of pressure block members (50a) may be placed around either the first plate (10) or the second plate (30).

[0110] When a pressure block (50) is provided by stacking multiple layers of pressure block members (50a), the Young's modulus and coefficient of thermal expansion of the pressure block (50) are calculated using the thickness ratio (height ratio) of the pressure block members (50a), and can be treated as a single pressure block (50).

[0111] Referring to FIG. 6a, the pressure block (50) may be provided with a plurality of layers of pressure block members (50a) stacked on the side of the first plate (10). At this time, the plurality of layers of pressure block members (50a) may be made of the same material.

[0112] Specifically, the first pressure block (50-1) may have two layers of pressure block members (50a) stacked on the side of the first plate (10), and the thickness of the first and second layers of pressure block members (50a) may be the same.

[0113] Referring to FIG. 6b, the pressure block (50) may be provided with a plurality of layers of pressure block members (50a) stacked on the side of the first plate (10), and at least one of the plurality of layers of pressure block members (50a) may have a different material.

[0114] Specifically, the first pressure block (50-1) may have three layers of pressure block members (50a) stacked on the side of the first plate (10), and the second layer of pressure block members (50a) may have a different material from the first and third layers of pressure block members (50a).

[0115] For example, at least one of the multiple layers of pressure block members (50a) may have a different coefficient of linear expansion.

[0116] In this case, if the multi-layered pressure block member (50a) has a different material and a different linear expansion coefficient, it is easier to apply a finer linear expansion coefficient than the integrated pressure block (50) of FIGS. 5a to 5d.

[0117] Referring to FIG. 6c, the pressure block (50) may be provided with a plurality of layers of pressure block members (50a) stacked on the side of the first plate (10), and at least one of the plurality of layers of pressure block members (50a) may have a different thickness.

[0118] Specifically, the first pressure block (50-1) may have two layers of pressure block members (50a) stacked on the side of the first plate (10), and the thicknesses of the first and second layers of pressure block members (50a) may be different.

[0119] In this case, the pressure block member (50a) of multiple layers has different thicknesses (heights) in the vertical direction (Z), and by combining pressure block members (50a) of different thicknesses, the degree of linear expansion can be finely controlled, unlike the integrated pressure block (50) of FIGS. 5a to 5d.

[0120] Referring to FIG. 6b, the pressure block (50) may be provided with a plurality of pressure block members (50a) stacked on the side of the first plate (10), and at least one of the plurality of pressure block members (50a) may have a different installation width in the left-right direction (Y). The installation width in the left-right direction (Y) may not affect the physical properties of the pressure block (50), such as Young's modulus and coefficient of thermal expansion.

[0121] Therefore, physical properties such as the Young's modulus and coefficient of thermal expansion of the pressure block (50) can be calculated using the thickness ratio (height ratio) of the pressure block member (50a) and treated as a single pressure block (50).

[0122] Classification Parameter Thickness (mm) Coefficient of Linear Expansion (mm / mm) Young's Modulus (GPa) 1st Pressure Block (50-1) h3-1 a3-1 E3-1 2nd Pressure Block (50-2) h3-2 a3-2 E3-2 1st Plate (10) h4-1 a4-1 E4-1 2nd Plate (30) h4-2 a4-2 E4-2 Laminate (S) h5 a5 E5

[0123] Below, we examine Equations (1) to (7), which are condition equations satisfied by the thermal fusion device of the present invention based on various parameters in [Table 1]. In the following condition equations, the concept of linear expansion occurring on one side (length) of the object undergoing thermal expansion was used to quantify the thermal expansion occurring in the steel plate laminate (S), which is the object of thermal expansion, and the components of the thermal fusion device of the present invention. This will be explained in more detail later with reference to FIGS. 7a and 7b. When the linear expansion coefficients of the first plate (10) and the second plate (30) are denoted as a4-1 and a4-2, the following Equation (1) can be satisfied.

[0124] [Equation 1] (a⁴-1 + a⁴-2) / 2 > 10×10 -6 mm / mm

[0125] For the linear expansion coefficients of the first plate (10) and the second plate (30), as in [Equation 1], (a4-1 + a4-2) / 2 > 10 × 10 -6 A relationship of mm / mm is required. At this time, in order to obtain the effect of the second plate (30) expanding with respect to the laminate (S) as the temperature rises and applying pressure to the laminate (S), the linear expansion coefficient averaged together with the first plate (10) located on the opposite side of the laminate (S) is required to transmit a vertical compressive force to the laminate (S) according to the condition of [Equation 1].

[0126] At this time, considering room temperature, which is the manufacturing temperature of the steel sheet laminate (S), and a temperature between 160 and 250 degrees, which is the bonding temperature of the adhesive layer of the bonding steel sheet (Sa), the coefficient of linear expansion is always (a4-1 + a4-2) / 2 > 10×10 in both temperature ranges. -6The relationship must be satisfied so that the effect of applying pressure to the steel plate laminate (S) due to linear expansion (thermal expansion) of the first plate (10) and the second plate (30) is imparted.

[0127] When the thickness of the laminate (S) is h5, the linear expansion coefficient of the laminate (S) is a5, the thicknesses of the first pressure block (50-1) and the second pressure block (50-2) are h3-1 and h3-2, and the linear expansion coefficients of the first pressure block (50-1) and the second pressure block (50-2) are a3-1 and a3-2, the following equation (2) can be satisfied.

[0128] [Equation 2] (a3-1×h3-1 + a3-2×h3-2) / 40 < a5×h5 < (a3-1×h3-1 + a3-2×h3-2) / 10

[0129] As in [Equation 2], it may be desirable to have a range of (a3-1×h3-1 + a3-2×h3-2) / 40.

[0130] For example, depending on the coefficient of linear expansion, the actual degree of linear expansion (thermal expansion) is proportional to the length of the material undergoing thermal expansion, and thus the linear expansion of the pressure block (50) can be expressed as a3-1×h3-1 or a3-2×h3-2.

[0131] When the degree of expansion of the pressure block (50) exceeds 10 times the degree of thermal expansion of the steel plate laminate (S) and thermal expansion occurs in the pressure block (50), compressive stress can be effectively generated. Therefore, appropriate pressure can be applied to the adhesive layer of the bonding steel plate (Sa).

[0132] Meanwhile, if thermal expansion occurs in the pressure block (50) exceeding 40 times, a pressure greater than the appropriate compressive stress is generated, and the bonding layer may be destroyed when the bonding layer softens due to heating, so it may be desirable to satisfy the range of [Equation 2].

[0133] When the Young's modulus of the first plate (10) and the second plate (30) is set to E4-1 and E4-2, the average of E4-1 and E4-2 is set to E4avg, and the Young's modulus of the laminate (S) is set to E5, the following equation (3) can be satisfied.

[0134] [Equation 3] 5 > E4avg / E5 > 0.2

[0135] If the Young's moduli of the first plate (10) and the second plate (30), E4-1 and E4-2, differ significantly from the average Young's moduli of the laminate (S), then when they expand simultaneously due to heat, the first plate (10) and the second plate (30) must transfer the stress generated from the expansion to the laminate (S). However, if the Young's moduli of the laminate (S) are low, plastic deformation may occur, and the bonding layer on the surface may fail to function and be destroyed.

[0136] Conversely, if the average of the Young's moduli E4-1 and E4-2 of the first plate (10) and the second plate (30) differs little from the Young's moduli E5 of the laminate (S), the pressure is not sufficiently transferred, and the reaction occurs weakly. Therefore, it may be desirable to satisfy the range of [Equation 3].

[0137] When the Young's modulus of the first plate (10) and the second plate (30) is E4-1 and E4-2, the Young's modulus of the first pressure block (50-1) and the second pressure block (50-2) is E3-1 and E-2, the average of E4-1 and E4-2 is E4avg, and the average of E3-1 and E3-2 is E3avg, the following equation (4) can be satisfied.

[0138] [Equation 4] 5 > E4avg / E3avg > 0.2

[0139] When applying pressure to a laminate (S) in contact with the first plate (10) and the second plate (30) above, and when the first pressure block (50-1) and the second pressure block (50-2) are positioned opposite the laminate (S) to the first plate (10) and the second plate (30), respectively, to reinforce the pressure, if the difference between the average Young's modulus of the first plate (10) and the second plate (30) and the average Young's modulus of the first pressure block (50-1) and the second pressure block (50-2) is large, the transmission of the pressure force may not be smooth.

[0140] At this time, if the Young's modulus of the first plate (10) and the second plate (30) is significantly greater than the Young's modulus of the first pressure block (50-1) and the second pressure block (50-2), the vertical stress generated by the first pressure block (50-1) and the second pressure block (50-2) may be repelled and not transferred to the laminate (S).

[0141] In the opposite case, the stress generated in the first pressure block (50-1) and the second pressure block (50-2) is not evenly distributed over the entire surface area of ​​the first plate (10) and the second plate (30) and is not evenly transferred to the laminate (S), and there is a problem that it acts strongly locally around the connector (70). Therefore, it may be desirable to satisfy the range of [Equation 4].

[0142] When the thicknesses of the first pressure block (50-1) and the second pressure block (50-2) are h3-1 and h3-2, the thicknesses of the first plate (10) and the second plate (30) are h4-1 and h4-2, and the thickness of the laminate (S) is h5, the following equations (5) and (6) can be satisfied.

[0143] [Equation 5] h4-1 + h4-2 > 10 mm,

[0144] [Equation 6] (h3-1 + h3-2 ) / h5 > 0.05

[0145] In relation to [Equation 5], regarding the thickness of the first pressure block (50-1), the second pressure block (50-2), the first plate (10), and the second plate (30), the relationship h4-1 + h4-2 > 10 mm may be preferred.

[0146] In order to apply appropriate pressure to the entire surface of the steel plate laminate (S), it is easier as the thickness of the first plate (10) and the second plate (30) increases, but this may be difficult to implement in actual production.

[0147] In order to maintain flatness against deformation for bonding pressure, it may be desirable for the sum of the first plate (10) and the second plate (30) to exceed at least 10 mm.

[0148] In relation to [Equation 6], regarding the sum of the thicknesses of the first pressure block (50-1) and the second pressure block (50-2) and the thickness (height) h5 of the steel plate laminate (S), it may be preferable to limit the range to (h3-1 + h3-2) / h5 > 0.05.

[0149] In the configuration of the heat fusion device, in order to transmit a sufficient amount of pressure to the laminate through the expansion of the first pressure block (50-1) and the second pressure block (50-2) when heated, it may be preferable to set the minimum thickness to (h3-1 + h3-2) / h5 > 0.05.

[0150] Since the pressure is transmitted within the elastic range, the amount of compression due to linear expansion during actual calculation and the pressure applied to the actual steel plate laminate (S) may have a non-linear relationship. Therefore, in order to apply sufficient pressure, it may be desirable for the first pressure block (50-1) and the second pressure block (50-2) for pressure application to have a thickness of at least 0.05 times that of the steel plate laminate (S).

[0151] In cases where the first pressure block (50-1) and second pressure block (50-2) with a large amount of linear expansion are used, there may be a problem where the pressure becomes excessively large, but since this is due to the linear expansion coefficient / temperature, the condition of the invention can be set only for the lower limit of the size.

[0152] When the thicknesses of the first plate (10) and the second plate (30) are denoted as h4-1 and h4-2, the following equation (7) can be satisfied.

[0153] [Equation 7] 0.25 < h4-1 / h4-2 < 4

[0154] The thickness of the first plate (10) and the second plate (30) is stable in terms of uniform pressure when the two constituent materials are the same, but different materials can be used for the sake of making the machine lighter, and also, since the first plate (10) or the second plate (30) can be made of a material with large linear expansion for pressure, there is no need for their thickness to be the same.

[0155] However, if the difference in thickness between the first plate (10) and the second plate (30) is excessively large, the difference in pressure in the stacking direction in the laminate (S) increases in the vertical direction (Z, height direction), and the quality of the bonding is weakened, so this is limited.

[0156] FIGS. 7a and 7b are conceptual diagrams for measuring the coefficient of linear expansion of a laminate (S) placed in the thermal fusion device of the present invention and other materials of the thermal fusion device of the present invention.

[0157] Next, FIG. 7a shows a conceptual diagram for measuring the coefficient of linear expansion of a laminated steel plate (S) having a plurality of bonded steel plate (Sa) adhesive layers. FIG. 7b shows a conceptual diagram for measuring the coefficient of linear expansion of other materials.

[0158] In order to clearly control the application of pressure exceeding a certain magnitude by utilizing the thermal expansion of the material, it is necessary to measure the coefficient of linear expansion of the material. For example, the measurement of the coefficient of linear expansion of a steel sheet laminate (S) involves measuring the thermal expansion of the bonding steel sheet (Sa) plane, which is parallel to the laminate plane, rather than the thermal expansion in the lamination direction. This can be achieved by measuring the linear coefficient of linear expansion using the method defined in ASTM E831 and equivalent international standards.

[0159] For example, in the present invention, the coefficient of linear expansion of the material is the value of the coefficient of linear expansion measured by the ASTM E831 method, and means the value obtained by measuring the thermal expansion in the range from 20°C to 120°C and dividing it by the change in temperature.

[0160] Next, referring to FIGS. 7a and 7b, the Young's modulus E3-1, E3-2, E4-1, E4-2, and E5 of each plate, steel plate laminate (S), and connector (70) in Table 1 can be measured in accordance with the international standard ASTM E-111.

[0161] For example, in the case of Young's modulus E3-1, E3-2, E4-1, and E4-2, both compression and tensile Young's modulus measurements are possible, but the Young's modulus E5 of the steel plate laminate (S) is measured by stacking 20 or more bonded steel plates (Sa) and performing compression in a direction perpendicular to the bonding surface, and the Young's modulus (△L) in compression is measured in a state where individual sheets are stacked while the bonding is not hardened, and this value can be used.

[0162] Accordingly, by raising the heat fusion device of the present invention, which satisfies [Equation 1] to [Equation 7] described in detail so far, to a temperature at which the adhesive layer of the bonding steel plate (Sa) of the steel plate laminate (S) is activated, and then cooling it, the steel plate laminate (S) of the present invention, such as a steel core for a motor or generator core, can be manufactured.

[0163] Next, the components included in the heat fusion method according to one embodiment of the present invention will be described in detail.

[0164] The heat fusion method of the present invention may utilize the aforementioned heat fusion device, and the heat fusion method may include a stack (S) placement step and a stack (S) fusion step.

[0165] Referring to FIGS. 1 to 4, in the stack (S) placement step, the stack (S) can be placed between the first plate (10) and the second plate (30). A pressure block (50) can be placed on the opposite side of the stack (S) with at least one of the first plate (10) and the second plate (30) in between. Subsequently, a connector (70) can connect the first plate (10), the second plate (30), and the pressure block (50).

[0166] The lamination (S) fusion step involves heating the lamination (S) and the heat fusion device, and applying pressure to the lamination (S) with a pressure block (50) to fuse the lamination (S).

[0167] The lamination (S) fusion step can generate thermal expansion (linear expansion) in the pressurized block (50) and the lamination (S) by heating the lamination (S) and the thermal fusion device with hot air, etc.

[0168] The linear expansion coefficient of the pressure block (50) can be formed to be greater than the linear expansion coefficient of the laminate (S).

[0169] The lamination (S) fusion step can be performed by heating the lamination (S) and the heat fusion device while the linear expansion coefficient of the pressure block (50) is greater than the linear expansion coefficient of the lamination (S), thereby allowing the pressure block (50) to apply pressure to the lamination (S).

[0170] In the heat fusion method of the present invention, when heat is applied to a laminate (S) and a heat fusion device, the linear expansion coefficient of the pressure block (50) is greater than the linear expansion coefficient of the steel plate laminate (S) in which a plurality of bonding steel plates (Sa) are laminated, so as it is heated, it expands linearly, and accordingly, the pressure block (50) applies pressure to the steel plate laminate (S), and as a result, the heat fusion of the steel plate laminate (S) can be implemented in a simple way.

[0171] In addition, it goes without saying that various embodiments of a heat fusion device having various embodiments described above can be applied to the heat fusion method of the present invention.

[0172] Therefore, the configuration of the first plate (10), second plate (30), pressure block (50), and connector (70) of the heat fusion device used in the heat fusion method is identical to the configuration of the heat fusion device as previously explained, so a detailed explanation thereof is omitted to avoid duplication.

[0173] Although embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and it will be obvious to those skilled in the art that various modifications and variations are possible within the scope of the technical concept of the present invention as described in the claims.

[0174] [Explanation of the symbol]

[0175] 10: 1st Edition 30: 2nd Edition

[0176] 50: Pressure block 50a: Pressure block member

[0177] 50-1: 1st pressurized block 50-2: 2nd pressurized block

[0178] 70: Connector 71: Connector fixing bolt

[0179] 73: Connector nut h3-1: Thickness of the first pressure block

[0180] h3-2: Thickness of the second pressure block h4-1: Thickness of the first plate

[0181] h4-2: Thickness of the second plate h5: Thickness of the laminate

[0182] W: Washer S: Laminate, Steel Plate Laminate

[0183] Sa: Bonding steel plate X: Front and rear directions

[0184] Y: Left / Right direction Z: Up / Down direction

Claims

1. First 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 any one of paragraphs 1 through 3, The above pressure block is a heat fusion device spaced apart from the edge portion of the first plate or the second plate on a flat surface.

5. In any one of paragraphs 1 to 4, the 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 any one of paragraphs 1 through 5, 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 any one of paragraphs 1 to 6, the 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 or 8, At least one of the above-mentioned multiple layers of pressure block members is a heat fusion device having a different thickness.

10. A heat fusion device satisfying the following formula (1), wherein the linear expansion coefficients of the first plate and the second plate are denoted as a4-1 and a4-2, respectively, in any one of claims 1 to 9. [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), wherein the thickness of the laminate is h5, the linear expansion coefficient of the 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. A heat fusion device satisfying the following formula (3) in any one of claims 1 to 11, wherein 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. A heat fusion device satisfying the following equation (4) in either of paragraphs 2 and 11, wherein the Young's modulus of the first plate and the second plate is E4-1 and E4-2, the Young's modulus of the first pressure block and the second pressure block is E3-1 and E-2, 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. A heat fusion device satisfying the following formulas (5) and (6), wherein in any one of claims 2, 11 and 13, 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. A heat fusion device satisfying the following formula (7) in any one of claims 1 to 14, wherein 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. A thermal fusion device according to any one of claims 1 to 15, wherein the laminate is provided as an iron core structure for an electrical device core in which a plurality of layers of bonding 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 16, 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 fuse the lamination.

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