Die for drawing and forming flat wire

Abstract

The utility model relates to the technical field of drawing forming dies, in particular to a flat wire drawing forming die, which comprises a front die holder, a distributing die, a sizing die and a rear die holder, the front die holder and the rear die holder are closed to form a forming space, the distributing die and the sizing die are positioned in the forming space, and a metal wire sequentially passes through the front die holder, the distributing die, the sizing die and the rear die holder. A rectangular die hole is formed in the middle of the sizing die, and the length-width ratio of the rectangular die hole is larger than or equal to five. A special-shaped through hole is formed in the center of the material distributing die and right faces the rectangular die hole in position, and the length and the width of the special-shaped through hole are both larger than those of the rectangular die hole. The special-shaped through hole comprises expansion parts and a connecting part, and the two ends of the connecting part are connected with the expansion parts respectively. The material distribution mold plays a role in distributing fed materials, so that the thickness difference between the middle part and the edge of the flat wire is reduced to be below 100 microns; the material distributing die and the sizing die are positioned through the front die holder and the rear die holder, and accurate positioning of the material distributing die and the sizing die is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of drawing and forming dies, in particular to a die for drawing and forming flat wires. Background Art

[0002] Enameled wire is categorized into flat wire and round wire. Flat wire generally has a rectangular cross-section, and the metal core of the flat wire is typically formed using a drawing process. During the drawing process, the pre-extruded metal wire passes through a drawing die and is formed into a rectangular flat wire. Existing drawing dies typically only have rectangular die holes. For example, CN111468546A discloses a fine flat wire drawing die with rounded corners. The die comprises a forming cylinder, a right-angle connecting plate, and a fixed sleeve. The fixed sleeve is positioned at the discharge end of a fixed frame via the right-angle connecting plate, with the feed direction as its axis. The forming cylinder is coaxially mounted on the fixed sleeve, and a die with the same cross-sectional shape as the finished flat wire is coaxially positioned within the forming cylinder 6a. When the width-to-thickness ratio of the flat wire is greater than five, the edge thickness differs by 300-600μm from the middle thickness, resulting in a thicker center and thinner edges. This results in significant dimensional errors in the flat wire, leading to errors in the resistance calculation of the flat wire and affecting the tightness of the enameled wire winding arrangement. Utility Model Content

[0003] The utility model aims to provide a die for drawing and forming a flat wire, which has the characteristic of high forming precision.

[0004] To achieve this purpose, the present invention adopts the following technical solutions:

[0005] A die for drawing and forming a flat wire, comprising a front die base, a dividing die, a sizing die, and a rear die base. The front die base and the rear die base are combined to form a forming space. The dividing die and the sizing die are located in the forming space. The metal wire passes through the front die base, the dividing die, the sizing die, and the rear die base in sequence.

[0006] A rectangular die hole is opened in the middle of the sizing die, and the aspect ratio of the rectangular die hole is greater than or equal to five; a special-shaped through hole is opened in the center of the material dividing die, and the special-shaped through hole is located opposite to the rectangular die hole, and the length and width of the special-shaped through hole are greater than the rectangular die hole;

[0007] The special-shaped through hole includes an enlarged portion and a connecting portion, and both ends of the connecting portion are respectively connected to one of the enlarged portions.

[0008] Furthermore, the enlarged portion includes an upper inclined surface and a lower inclined surface, and the upper inclined surface and the lower inclined surface are connected by a curved surface;

[0009] The connecting portion is straight, the upper inclined surface is connected to the top surface of the connecting portion, and the lower inclined surface is connected to the bottom surface of the connecting portion.

[0010] Furthermore, the width of the connecting portion is greater than the width of the rectangular die hole, and the end of the rectangular die hole corresponds to the central portion of the enlarged portion.

[0011] Furthermore, the thickness of the dividing mold is 3~8mm.

[0012] Furthermore, a clearance groove is provided on the rear end surface of the sizing die, and the rectangular die hole is located in the middle of the clearance groove.

[0013] Furthermore, the front die base is provided with a material feed hole, the rear end face of the front die base is provided with a material receiving groove, and the material dividing die is against the end face of the material receiving groove.

[0014] Furthermore, the flat wire drawing die also includes a die pad, which is located between the sizing die and the rear die base.

[0015] Furthermore, the front mold base and the rear mold base are respectively provided with a plurality of mounting holes, and screws pass through the mounting holes to lock the front mold base and the rear mold base.

[0016] The technical solution provided by the utility model may have the following beneficial effects:

[0017] The special-shaped through holes of the dividing die have a distribution effect on the feed, increasing the material storage capacity of the feed area on both sides of the front end of the rectangular die hole, thereby eliminating the material shortage phenomenon at both ends of the rectangular die hole and reducing the thickness error between the middle and edge of the flat wire. The use of the die of the utility model can reduce the thickness difference between the middle and edge of the flat wire to less than 100μm; the dividing die and the sizing die are positioned by the front die base and the rear die base to ensure the precise positioning of the dividing die and the sizing die. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is an exploded schematic diagram of a flat wire drawing and forming die according to one embodiment of the present invention;

[0019] Figure 2 yes Figure 1 An exploded schematic diagram of another perspective of the flat wire drawing die shown;

[0020] Figure 3 It is a structural diagram of the material dividing mold;

[0021] Among them, the front die base 1, the feed hole 11, the material trough 12, the material dividing die 2, the special-shaped through hole 21, the expanded part 211, the upper inclined surface 211a, the lower inclined surface 211b, the connecting part 212, the sizing die 3, the rectangular die hole 31, the makeshift groove 32, the rear die base 4, the die pad 5, and the mounting hole 6. DETAILED DESCRIPTION

[0022] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0023] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting the present invention. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more such features, and are used to distinguish between the described features, without distinction of order or importance.

[0024] In the description of the present invention, unless otherwise specified, “a plurality of” means two or more.

[0025] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0026] The following combination Figures 1 to 3 , describing a flat wire drawing and forming die according to an embodiment of the present utility model.

[0027] A flat wire drawing die, comprising a front die base 1, a dividing die 2, a sizing die 3, and a rear die base 4. The front die base 1 and the rear die base 4 are combined to form a forming space. The dividing die 2 and the sizing die 3 are located in the forming space. The metal wire passes through the front die base 1, the dividing die 2, the sizing die 3, and the rear die base 4 in sequence.

[0028] A rectangular die hole 31 is provided in the middle of the sizing die 3, and the aspect ratio of the rectangular die hole 31 is greater than or equal to five; a special-shaped through hole 21 is provided in the center of the dividing die 2, and the special-shaped through hole 21 is positioned opposite to the rectangular die hole 31, and the length and width of the special-shaped through hole 21 are greater than those of the rectangular die hole 31;

[0029] The special-shaped through hole 21 includes an enlarged portion 211 and a connecting portion 212 , and both ends of the connecting portion 212 are respectively connected to one of the enlarged portions 211 .

[0030] In the present invention, first, a dividing die 2 is provided at the front end of the sizing die 3, and the special-shaped through holes 21 thereon play a role in distributing the feed, thereby increasing the material storage capacity of the feed area on both sides of the front end of the rectangular die hole 31, thereby eliminating the material shortage phenomenon at both ends of the rectangular die hole 31, and reducing the thickness error between the middle and edge of the flat wire. The mold of the present invention can reduce the thickness difference between the middle and edge of the flat wire to less than 100μm; then, the dividing die 2 and the sizing die 3 are positioned by the front die base 1 and the rear die base 4 to ensure the precise positioning of the dividing die 2 and the sizing die 3.

[0031] Specifically, when the width-to-thickness ratio of a flat wire is greater than five, the discharge pressure from the die hole during drawing becomes uneven, resulting in a thicker center and thinner edges of the flat wire, leading to large dimensional errors. In the present invention, a splitter die 2 is added to the front end of the sizing die 3. The ends of the special-shaped through-hole 21 of the splitter die 2 are enlarged, increasing the amount of material stored at both ends of the rectangular die hole 31. This reduces the thickness errors between the center and edges of the flat wire and improves the forming accuracy of the flat wire.

[0032] In one embodiment of the present invention, the expanded portion 211 includes an upper inclined surface 211a and a lower inclined surface 211b, which are connected by an arcuate surface. The connecting portion 212 is straight, with the upper inclined surface 211a connecting to the top surface of the connecting portion 212 and the lower inclined surface 211b connecting to the bottom surface of the connecting portion 212. The inclined surfaces serve as guides, facilitating the flow of material from the expanded portion 211 into the rectangular die hole 31, thereby preventing material from becoming stuck.

[0033] Preferably, the width of the connecting portion 212 is greater than the width of the rectangular die hole 31, and the end of the rectangular die hole 31 corresponds to the central part of the expanded portion 211, so that it has an appropriate amount of material storage and achieves a better drawing effect.

[0034] In one embodiment of the present invention, the thickness of the splitter die 2 is 3-8 mm. The thickness of the splitter die 2 is related to the size of the flat wire. If the splitter die 2 is too thick, the material storage is large, increasing the pulling force and causing surface defects. If the splitter die 2 is too thin, the material storage is small, making it difficult to achieve high flat wire forming accuracy.

[0035] Preferably, a clearance groove 32 is provided on the rear end face of the sizing die 3 , and the rectangular die hole 31 is located in the middle of the clearance groove 32 . Preferably, the edge of the rectangular die hole 31 and the bottom surface of the clearance groove 32 are smoothly transitioned.

[0036] Preferably, the front die base 1 is provided with a feed hole 11, and the rear end face of the front die base 1 is provided with a material receiving groove 12, and the material dividing die 2 abuts against the end face of the material receiving groove 12. The material receiving groove 12 is used to accommodate the bulge 211 of the metal wire due to drawing deformation.

[0037] In one embodiment of the present invention, the die for drawing and forming the flat wire further includes a die pad 5, which is located between the sizing die 3 and the rear die base 4. The die pad 5 is used to ensure that the dividing die 2 and the sizing die 3 are tightly pressed in the forming space. When the dividing die 2 and the sizing die 3 are replaced based on the model of the flat wire, the dividing die 2 and the sizing die 3 can be reliably positioned in the forming space by replacing the die pad 5 with different thicknesses. Therefore, a set of front die base 1 and rear die base 4 can be used for forming various types of flat wires. Exemplarily, the forming space is cylindrical or rectangular, and correspondingly, the sizing die 3 and the dividing die 2 are cylindrical or square.

[0038] Exemplarily, the front mold base 1 and the rear mold base 4 are respectively provided with a plurality of mounting holes 6 , and screws are passed through the mounting holes 6 to lock the front mold base 1 and the rear mold base 4 . The locking method is simple and reliable.

[0039] Other structures and operations of a flat wire drawing die according to an embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0040] Throughout this specification, references to terms such as "embodiment" and "example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0041] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A flat wire drawing die, characterized in that: It includes a front die base, a dividing die, a sizing die and a rear die base, wherein the front die base and the rear die base are combined to form a molding space, the dividing die and the sizing die are located in the molding space, and the metal wire passes through the front die base, the dividing die, the sizing die and the rear die base in sequence; A rectangular die hole is opened in the middle of the sizing die, and the aspect ratio of the rectangular die hole is greater than or equal to five; a special-shaped through hole is opened in the center of the material dividing die, and the special-shaped through hole is located opposite to the rectangular die hole, and the length and width of the special-shaped through hole are greater than the rectangular die hole; The special-shaped through hole includes an enlarged portion and a connecting portion, and both ends of the connecting portion are respectively connected to one of the enlarged portions.

2. The flat wire drawing die according to claim 1, characterized in that: The enlarged portion includes an upper inclined surface and a lower inclined surface, and the upper inclined surface and the lower inclined surface are connected by a curved surface; The connecting portion is straight, the upper inclined surface is connected to the top surface of the connecting portion, and the lower inclined surface is connected to the bottom surface of the connecting portion.

3. The flat wire drawing die according to claim 2, characterized in that: The width of the connecting portion is greater than the width of the rectangular die hole, and the end of the rectangular die hole corresponds to the central portion of the enlarged portion.

4. The flat wire drawing die according to claim 1, 2 or 3, characterized in that: The thickness of the dividing mold is 3-8 mm.

5. The flat wire drawing die according to claim 4, characterized in that: A clearance groove is provided on the rear end surface of the sizing die, and the rectangular die hole is located in the middle of the clearance groove.

6. The flat wire drawing die according to claim 4, characterized in that: The front die base is provided with a material feeding hole, the rear end surface of the front die base is provided with a material containing groove, and the material dividing die is against the end surface of the material containing groove.

7. The flat wire drawing die according to claim 6, characterized in that: It also includes a die pad, which is located between the sizing die and the rear die base.

8. The flat wire drawing die according to claim 4, characterized in that: The front mold base and the rear mold base are respectively provided with a plurality of mounting holes, and screws pass through the mounting holes to lock the front mold base and the rear mold base.

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