JP5741564B2 - Coating dies for flat rectangular enameled wire and manufacturing method of flat rectangular enameled wire - Google Patents

Description

  The present invention relates to a combination type flat enameled wire coating die and a method for producing a flat enameled wire.

  Conventionally, as a magnet wire for a motor or a transformer, a rectangular enameled wire that can be coiled with a higher space factor has been used.

  When producing a flat enameled wire, an enamel paint is applied to the flat conductor, and then the flat conductor coated with the enamel paint is passed through a flat die enamel wire coating die and baked to form an enamel film.

  As a flat enameled wire coating die, a combination type flat enameled wire coating die (also referred to as a set die) that can accommodate flat enameled wires of various dimensions is known.

  As shown in FIG. 3, the combination type flat enameled wire coating die 31 is configured by combining four die parts 32.

  The die component 32 is mounted on the shaft portion 35 and a die holder 36 having a head portion 34 in which the through-hole 33 is formed and a shaft portion 35 extending from the head portion 34 in a direction perpendicular to the axial direction of the through-hole 33. A hollow cylindrical die spin 37.

  The flat enameled wire coating die 31 uses four die parts 32 and inserts the shaft part 35 and the die spin 37 of the die holder 36 of each die part 32 into the through hole 33 of the head part 34 of the adjacent die part 32. Assembled. A rectangular (rectangular) gap formed between the four die parts 32 serves as an insertion hole 38 through which a flat rectangular conductor passes.

  In addition, there exists patent document 1 as prior art document information relevant to invention of this application.

JP 2011-142030 A

  However, the cross-sectional shape of the rectangular conductor is not a complete rectangular shape, and the corner portion is rounded according to a standard such as JIS (Japanese Industrial Standard).

  Therefore, if the flat conductor is passed through the rectangular insertion hole 38, the gap (gap between the flat conductor and the flat enamel wire coating die 31) increases at the corner, and the enamel paint is applied to the corner of the flat conductor. Many stick.

  When a large amount of enamel paint adheres, the surface is cured before the solvent of the enamel paint evaporates during the baking process, and foaming (foamed particles) is generated in the enamel film. Therefore, when a flat rectangular enamel wire is manufactured using the conventional rectangular enamel wire coating die 31, the enamel film tends to be foamed at the corner portion, and the product characteristics deteriorate at the portion where the enamel film is foamed. In some cases, it becomes necessary to discard the part.

  Thus, in the conventional flat enameled wire coating die 31, the enamel coating property is poor, the film thickness of the enamel film varies, the yield deteriorates, and the productivity decreases. there were.

  The present invention has been made in view of the above circumstances, and provides a flat enameled wire coating die and a method of manufacturing a flat enameled wire that can suppress the variation in film thickness of the enamel film and improve productivity. For the purpose.

The present invention has been devised to achieve the above object, and has a head portion in which a through hole is formed and a shaft portion extending from the head portion in a direction perpendicular to the axial direction of the through hole. Four die parts having a die holder and a hollow cylindrical die spin mounted on the shaft part, the shaft part of the die part and the die spin being passed through the head of the other die part. In a rectangular enameled wire coating die in which a flat conductor is inserted between the four die parts by inserting and combining the four die parts, the insertion hole has a rectangular shape with a rounded corner in a cross-sectional view. is formed, said Daisupin is into close contact with the rectangular conductor for inserting the insertion hole while being rotatably mounted on the shaft portion, the die holder may position the corner portion of the insertion hole A curved portion of concave which said curved portion is a small rectangular enameled wire coating die than its radius of curvature is the curvature radius of the corner portion of the rectangular conductor.

  When the four die parts are combined, the die part located at the corner part of the insertion hole may be formed into a curved shape so that the cross-sectional shape of the insertion hole may be a rectangular shape with rounded corner parts. .

  When the four die parts are combined, the head of the die holder is positioned at the corner portion of the insertion hole, and the head of the die holder positioned at the corner portion of the insertion hole is formed in a curved shape. The cross-sectional shape of the insertion hole may be a rectangular shape with rounded corner portions.

  When the four die parts are combined, the end of the die spin is positioned at the corner of the insertion hole, and the end of the die spin positioned at the corner of the insertion hole is formed in a curved shape. The cross-sectional shape of the insertion hole may be a rectangular shape with rounded corner portions.

  An urging member that urges each of the die parts in a direction in which the insertion hole becomes smaller may be further provided.

  The present invention also provides a method for producing a rectangular enameled wire in which a rectangular conductor coated with an enamel coating is passed through a coating die for a rectangular enameled wire and then subjected to a baking treatment to form an enamel film. The method for producing a flat enameled wire using the flat die enameled wire coating die of the present invention.

  ADVANTAGE OF THE INVENTION According to this invention, the dispersion | variation in the film thickness of an enamel membrane | film | coat can be suppressed and the flat die enameled wire coating die which can improve productivity, and the manufacturing method of a flat angle enameled wire can be provided.

1 is a plan view of a flat die enameled wire coating die according to an embodiment of the present invention and a front view of a die part. It is a figure which shows the die holder used for the coating die for flat angle enamel wires of FIG. 1, (a) is a top view, (b) is a left side view, (c) is a front view, (d) is a right side view, (e ) Is a bottom view, and (f) is an enlarged view of the 1F part of (c). It is the top view of the conventional coating die for rectangular enamel wires, and the front view of die parts.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a plan view of a flat enameled wire coating die according to the present embodiment and a front view of a die part.

  As shown in FIG. 1, the flat enameled wire coating die 1 is configured by combining four die parts 2.

  The die part 2 is mounted on the shaft part 5 and a die holder 6 having a head part 4 in which the through hole 3 is formed and a shaft part 5 extending from the head part 4 in a direction perpendicular to the axial direction of the through hole 3. And a hollow cylindrical die spin 7.

  The flat enameled wire coating die 1 is formed by inserting the shaft part 5 and the die spin 7 of the die part 2 into the through hole 3 of the head part 4 of the other die part 2 and combining them. An insertion hole 8 through which a flat rectangular conductor passes is formed.

  As shown in FIGS. 2A to 2F, the die holder 6 includes a substantially rectangular parallelepiped head portion 4 in which the through hole 3 is formed, and a columnar shaft portion 5 extending from the head portion 4. The head 4 and the shaft 5 are formed integrally. The through hole 3 is formed so as to penetrate from the right side surface of the head 4 to the left side surface.

  Here, the notch 4a is formed obliquely from the upper surface of the head 4 to the right side, and the lower end of the head 4 is tapered so as to gradually shrink toward the shaft 5 side. However, the shape of the head 4 is not limited to this. Here, the shaft portion 5 is formed by the large diameter portion 5a extending from the head portion 4 and the small diameter portion 5b extending from the tip of the large diameter portion 5a, but the shape of the shaft portion 5 is also limited to this. is not.

  The die spin 7 is rotatably mounted on the shaft portion 5 by inserting the shaft portion 5 into the hollow portion. The die spin 7 is provided at the end portion of the shaft portion 5 on the head portion 4 side, and is provided so as to contact the end portion of the head portion 4 on the shaft portion 5 side.

  Although not shown, the flat enameled wire coating die 1 according to the present embodiment further includes an urging member such as a spring that urges each die component 2 in a direction in which the insertion hole 8 becomes smaller. By providing the urging member, in the flat enameled wire coating die 1, each die part 2 is pressed against the flat conductor passing through the insertion hole 8, and the die spin 7 of each die part 2 comes into close contact with the flat conductor. ing. Hereinafter, such a method is referred to as a contact type.

  A large number of fine grooves are formed along the circumferential direction (that is, along the insertion direction of the rectangular conductor) on the surface of the die spin 7, and when the rectangular conductor passes through the insertion hole 8, Part of the enamel paint adhering to the film passes through this groove portion, and the enamel paint is applied to the surface of the flat conductor with a thin and uniform thickness. As the die spin 7, it is desirable to use a material made of a material to which the enamel paint hardly adheres depending on the enamel paint to be used.

  Now, in the flat enameled wire coating die 1 according to the present embodiment, the insertion hole 8 is formed in a rectangular shape with rounded corners in cross-sectional view. In the flat enamel wire coating die 1, when four die parts 2 are combined, the die part 2 located at the corner part (four corner parts) of the insertion hole 8 is formed into a concavely curved shape, thereby inserting the insertion hole. The cross-sectional shape of 8 is a rectangular shape with rounded corners.

  More specifically, in the flat enameled wire coating die 1, as shown in FIGS. 1 and 2, when the four die parts 2 are combined, the head 4 of the die holder 6 is positioned at the corner portion of the insertion hole 8. By forming the head 4 of the die holder 6 located at the corner portion of the insertion hole 8 into a concavely curved shape (hereinafter, this portion is referred to as a curved portion 9), the cross-sectional shape of the insertion hole 8 can be changed. The corner is rounded and rectangular. The curved portion 9 is formed uniformly and continuously with respect to the insertion direction of the flat conductor.

  The end of the die spin 7 is positioned at the corner portion of the insertion hole 8, and the end of the die spin 7 positioned at the corner portion of the insertion hole 8 is curved in a concave shape (for example, gradually toward the end portion). It is good also considering the cross-sectional shape of the insertion hole 8 as the rectangular shape which rounded the corner part. However, since the die spin 7 is a rotating member and is relatively easily displaced, it is desirable to form the curved portion 9 on the head 4 as in the present embodiment.

  In the case of a close-contact configuration in which each die part 2 (die spin 7) is brought into close contact with a flat conductor using an urging member, the curvature radius of the corner portion of the insertion hole 8 (that is, the curvature radius of the curved portion 9) is the flat conductor. If the radius of curvature is equal to or greater than the radius of curvature of the corner portion, the corner portion of the flat conductor contacts the die part 2. Therefore, when adopting a close contact type configuration, it is preferable to make the radius of curvature of the corner portion of the insertion hole 8 (the radius of curvature of the curved portion 9) smaller than the radius of curvature of the corner portion of the flat conductor.

  The radius of curvature of the corner portion of the insertion hole 8 (the radius of curvature of the curved portion 9) may be appropriately set according to the radius of curvature of the corner portion of the flat conductor.

  When producing a flat enameled wire using the flat enameled wire coating die 1, the enameled coated flat conductor is passed through the insertion hole 8 of the flat enameled wire coating die 1 and then introduced into the baking furnace. A baking process is performed to form an enamel film around the rectangular conductor. Thereafter, if enamel coating having a desired thickness is formed by repeating the application and baking of the enamel paint a plurality of times in the same manner, a rectangular enamel wire can be obtained.

  The operation of the present embodiment will be described.

  In the flat enameled wire coating die 1 according to the present embodiment, the assembly-type insertion hole 8 is formed in a rectangular shape with rounded corners in cross-sectional view.

  By comprising in this way, compared with the case where the penetration hole 8 is made into a rectangular shape, the enamel paint adhering to the corner portion of the flat conductor is reduced, and the enamel paint is uniformly applied around the flat conductor. It becomes possible to do. As a result, it is possible to suppress foaming (foamed particles) from being generated in the enamel film, and to suppress deterioration of product characteristics.

  In other words, according to the present invention, the coating for rectangular enameled wire that can improve the throwing power of the enamel coating and suppress the variation in the film thickness of the enamel coating, and can improve the yield and the productivity. Dice 1 can be realized.

  The present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made without departing from the spirit of the present invention.

  For example, in the above-described embodiment, the case where the flat-angle enameled wire coating die 1 has a close contact type configuration has been described, but the present invention can be applied to other types as long as it is an assembly type. . For example, in a gap-type configuration in which each die part 2 is fixed in position relative to each other with a fixing member such as a screw, and a gap (gap) is formed between each flat part conductor that passes through the insertion hole 8 and each die part 2. However, the present invention is applicable. When the gap type configuration is adopted, the contact between the flat conductor and each die part 2 can be avoided due to the presence of the gap, so that the curvature radius of the corner portion of the insertion hole 8 (the curvature radius of the curved portion 9) is set to be equal to that of the flat conductor. It is also possible to make it greater than the radius of curvature of the corner portion.

DESCRIPTION OF SYMBOLS 1 Coating dies for flat-angle enameled wire 2 Die parts 3 Through hole 4 Head 5 Shaft 6 Die holder 7 Die spin 8 Insertion hole 9 Curved part

Claims (6)

A die holder having a head formed with a through hole and a shaft extending from the head in a direction perpendicular to the axial direction of the through hole; a hollow cylindrical die spin mounted on the shaft; Four die parts having
By inserting and combining the shaft part of the die part and the die spin into the through hole in the head part of another die part, an insertion hole through which a rectangular conductor passes is formed between the four die parts. In flat enameled wire coating dies,
The insertion hole is formed in a rectangular shape with a rounded corner portion in a sectional view ,
The die spin is attached to the shaft portion so as to be rotatable and is in close contact with the flat conductor that is inserted through the insertion hole.
The die holder has a concave curved portion located at a corner portion of the insertion hole,
The flat enameled wire coating die , wherein the curved portion has a radius of curvature smaller than that of a corner portion of the flat conductor . When the four die parts are combined, the die part located at the corner part of the insertion hole is formed in a curved shape, so that the cross-sectional shape of the insertion hole is a rectangular shape with rounded corner parts. Item 2. A flat enameled wire coating die according to item 1. When the four die parts are combined, the head of the die holder is positioned at the corner portion of the insertion hole, and the head of the die holder positioned at the corner portion of the insertion hole is formed in a curved shape. The flat enameled wire coating die according to claim 1, wherein a cross-sectional shape of the insertion hole is a rectangular shape with rounded corner portions. When the four die parts are combined, the end of the die spin is positioned at the corner of the insertion hole, and the end of the die spin positioned at the corner of the insertion hole is formed in a curved shape. The flat enameled wire coating die according to claim 1, wherein a cross-sectional shape of the insertion hole is a rectangular shape with rounded corner portions. A biasing member that biases each of the die parts in a direction in which the insertion hole becomes smaller is further provided.
The flat-angle enameled wire coating die according to any one of claims 1 to 4 . In a method for producing a rectangular enamel wire in which a rectangular conductor coated with an enamel coating is passed through a coating die for a rectangular enamel wire and then subjected to a baking treatment to form an enamel film.
The flat enameled wire coating die according to any one of claims 1 to 5 is used as the flat enameled wire coating die. A method for producing a flat enameled wire.