JP3004417U - Bobbin shaped core - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a bobbin core in which powder is integrally molded, and a straight portion is provided in a circular portion of the bobbin-shaped core, or a groove is formed in a connecting portion of the flange portion to the core portion. Providing, tapering this groove, and providing R and C faces at the corners and corners to improve the fluidity of powder during integral molding to increase the compacting density and facilitate winding. The purpose is to make it easier to remove the mold, eliminate chipping, and increase strength. [Structure] A bobbin type core integrally formed by filling powder into a die having circular flanges 1 provided at both ends of a circular core 2 and pressurizing it in a circular radial direction.
Also, both ends are cut so that the cut surface of the circular core portion 2 is parallel to the pressing direction, and the straight portion 3 is provided in a direction substantially perpendicular to the cut surface.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a bobbin-shaped core integrally formed with powder.

[0002]

[Prior art]

 Conventionally, a ferrite bobbin core used for an inductor of an electronic circuit component has been produced by the steps of and of FIG. That is, the formed cylindrical bullet was cut to form a bobbin-shaped core, which was then fired to form the core.

Instead of this, many problems occurred when the powder was integrally molded and fired to form a bobbin-shaped core according to FIG.

[0004]

[Problems to be solved by the device]

 For example, there are the following drawbacks when manufacturing by integral molding. (1) It is difficult to form a bobbin-shaped core with a round flange, and the edge of the mold is easily chipped.

(2) When the powder is pressed and molded and then fired, cracks and deformation easily occur. (3) When the bobbin-shaped core is integrally molded, a corner is always generated and it is easy to chip. Therefore, it is desired that these problems do not occur when a bobbin-shaped core is integrally molded from powder.

In order to solve these problems, the present invention provides a straight portion on the circular portion of the bobbin-shaped core, a groove at the connection portion of the flange portion to the core portion, or a groove on the groove. It is possible to improve the fluidity of the powder during integral molding to increase the compacting density, facilitate winding, and easily remove the die by providing a taper or R and C faces at the corners and corners. The purpose is to remove damage, eliminate chipping, and increase strength.

[0007]

[Means for Solving the Problems]

 Means for solving the problem with reference to FIG. 1 will be described. In FIG. 1, the flange portion 1 is a circular flange portion that constitutes a bobbin type core.

The core portion 2 is a circular constricted portion forming a bobbin type core. The straight portion 3 is a straight line portion cut at both ends so that the cut surfaces of the circular flange portion 1 and the circular core portion 2 are parallel to the pressing direction, and substantially perpendicular to the cut surface.

The groove 4 is a groove that is provided in the circular flange portion 1 in the pressing direction to embed the root of the core portion 2. The taper 5 is a portion in which the groove 4 is tapered from the core portion 2 toward the outer diameter direction to facilitate die cutting.

[0010]

[Action]

 As shown in FIG. 1, the present invention is a bobbin type core in which powder is filled in a mold having circular flanges 1 at both ends of a circular core 2 and pressed in a circular radial direction to form an integrally molded bobbin core. Then, both ends are cut so that the cut surfaces of the circular flange portion 1 and the circular core portion 2 are parallel to the pressing direction, and the straight portion 3 is provided in a direction substantially perpendicular to the cut surface.

Further, in the bobbin type core, the circular flange portion 1 is provided with the groove 4 in the pressing direction, and the circular core portion 2 is coupled to the groove 4. Further, the groove 4 is tapered from the core portion 2 toward the outer diameter direction.

Further, an R surface or a C surface is provided at the corners or corners of the flange portion 1, the core portion 2, the straight portion 3, and the groove 4. Therefore, the straight portion 3 is provided in the circular portion, the groove 4 is provided in the connecting portion of the flange portion 1 to the core portion 2, the taper 5 is provided in the groove 4, and the R surface and the C surface are provided at the corners and corners. By providing the powder, the fluidity of the powder can be improved during the integral molding of the powder to increase the compaction density, winding can be facilitated, die cutting can be facilitated, chipping can be eliminated, and strength can be improved. It has become possible to increase.

[0013]

【Example】

 Next, the configuration and operation of the embodiment of the present invention will be sequentially described in detail with reference to FIGS.

FIG. 1 shows a block diagram of an embodiment of the present invention. FIG. 1A shows a top view. This is a top view of a bobbin-shaped core integrally formed with powder.

In FIG. 1A, a flange portion 1 is a circular flange portion forming a bobbin type core, and has both ends cut in the pressing direction (see FIG. 1B). ). The corners of the flange portion 1 are R-faces or C-faces so that they are difficult to chip and have improved strength.

The core portion 2 is a circular constricted portion forming a bobbin type core, and has both ends in the pressing direction cut (see (d) of FIG. 1). The corners and corners of the core portion 2 are R-faces or C-faces, which are difficult to chip and have improved strength.

FIG. 1B shows a state where pressure is applied to the mold. This is a state in which the mold, as shown in the figure, is filled with powder, the upper and lower punches are pressed against each other, and the bobbin-shaped core in Fig. 1 (a) is integrally molded. Show.

FIG. 1C shows a front view. This is a front view of the bobbin type core of FIG. The corners and corners of the flange portion 1 and the core portion 2 are R-faces or C-faces that are difficult to chip and have improved strength.

FIG. 1D shows the straight portion 3. This straight portion 3 is filled with powder in a mold, which is the mold of FIG. 1B, with powder, and when the upper and lower punches are pressed against each other, the flange portion 1 and the core portion 2 in the pressing direction are pressed. Both ends are cut so that the cut surface is a straight line in a direction substantially perpendicular to the cut surface and the corners of the mold (upper punch and lower punch) are not crossed. Further, the corners and corners of the straight portion 3 are made to be R-faces or C-faces, respectively, so as not to be easily broken and to improve the strength.

FIG. 1E shows the flange portion 1 of FIG. 1D in an easy-to-understand manner. The flange portion 1 is circular and has both ends in the pressing direction cut, and straight portions 3 are provided at right angles from the cut positions, and the corners and corners of the straight portions 3 are R-faces or C-faces.

FIG. 1F shows the groove 4 and the taper 5. The groove 4 is formed by forming a recess in the flange portion 1 so that the R surface or the C surface of the root of the core portion 2 is inward from the inner surface of the flange portion 1 and does not interfere with winding. . As a result, the core portion 2 can be strongly coupled to the flange portion 1, and the R surface and the C surface can be prevented from interfering with winding. Further, the taper 5 is formed in such a manner that the portion of the groove 4 widens as it goes outward from the core portion 2 to facilitate the die cutting.

FIG. 1G shows a perspective view of a bobbin type core with a groove. The corners and corners of the flange portion 1, the core portion 2, the groove 4, etc. are all R-faces or C-faces so that the core after integral molding is difficult to break and the strength is improved. Here, the circular upper portions of the flange portion 1 and the core portion 2 are each formed by an upper punch, the linear portions of the side surfaces are each formed by a us, and the lower portions are each formed by a lower punch. At this time, the corners and corners are formed by providing the R surface or the C surface at the corners and corners of the upper punch, the mouse, and the lower punch, respectively.

FIG. 2 is a diagram (part 1) for explaining a specific example of the present invention. FIG. 2A shows a state of pressurization. This shows a state in which the powder is filled in the uss 12 and the upper punch 11, the first lower punch 13 and the second lower punch 14 are pressed against each other to form the powder.

FIG. 2B shows a specific configuration of the upper punch 11, the first lower punch 13 and the second lower punch 14. Here, the upper punch 11 is a mold that forms the circular upper portions of the flange portion 1 and the core portion 2 as illustrated. The first lower punch 13 is a mold that forms a circular lower portion of the flange portion 1. The second lower punch 14 is a mold that forms a circular lower portion of the core 2.

2C, the upper punch 11 and the first lower punch 13 and the second lower punch 14 of FIG. 2B are pressed to form the flange portion 1 and the core portion 2. I will show you how. Uss 1 and 2 are dies positioned on both sides in a plane up to the left and right circular dotted lines.

FIG. 2D shows a pressure-formed bobbin-shaped core. This is done by using the upper punch 11, the us 12, the first lower punch 13 and the second lower punch 14 described in (a) to (c) of FIG. And a first lower pestle 13 and a second lower pestle 14 are pressed together to form a bobbin type core. In order to simplify the drawing, the bobbin-shaped core is not provided with the groove 4 and the taper 5 in FIGS. 2A to 2C, but in reality, the groove 4 and the taper 5 are provided to be described later. The integrally formed bobbin core is molded as shown in FIG.

FIG. 3 is a diagram (part 2) for explaining a specific example of the present invention. FIG. 3A shows a core portion 2 and a flange portion 1 which are integrally formed. Here, the front flange portion 1 is omitted for the sake of easy understanding of the drawing, and in reality, the same flange portion 1 as shown is also present in the front. As shown in the drawing, the groove 4 joins the root of the core portion 2 to the portion recessed from the inner surface of the flange 1, and imparts strength to this root by the R surface or the C surface, and also has this strength. The R surface or C surface is set so as not to be inward from the inner surface of the flange portion 1 so as not to be an obstacle when the coil is wound. Further, the groove 4 is provided with a taper 5 from the core portion 2 toward the outside, and pressure is applied between the upper punch 11 and the first lower punch 13 and the second lower punch 14 as shown in FIG. 2 (c). After the powder is molded by the above method, the upper die 11, the first lower die 13 and the second lower die 14 can be easily removed from the die.

FIG. 3B shows a top view of the whole of FIG. 3A. The portion 4 is a groove. FIG. 3C shows a front view of the whole of FIG. FIG. 3D is a side view of the AA plane of FIG. 3C viewed from the left. In addition, all the corners and corners are R planes or C planes.

[0029]

[Effect of device]

 As described above, according to the present invention, the round portion of the bobbin-shaped core is provided with the straight portion 3, or the groove 4 is provided at the connecting portion of the flange portion 1 to the core portion 2. Since the groove 4 is provided with the taper 5 and the corners and corners are formed into the R surface or the C surface, the flowability of the powder at the time of integral molding is improved to increase the molding density and the winding density. We were able to make it easier to draw lines, make it easier to demold, eliminate chipping, and increase strength. To be more specific, (1) Both ends of the circular flange portion 1 and the core portion 2 in the pressing direction are cut, and straight portions 3 are provided in a direction substantially perpendicular to the cut portions. It was possible to prevent chipping of the 1st lower punch 13 and the 2nd lower punch 14 and to eliminate the chipping of the corresponding part of the core and to improve the strength.

(2) A groove 4 is provided in the pressing direction of the flange portion 1 so that the core portion 1 is coupled to the groove 4 so as not to interfere with the winding, and a taper 5 is provided so that the upper punch as a mold It was possible to easily remove the mold from the first lower punch 13, the first lower punch 13, and the second lower punch 14.

(3) R-faces or C-faces were provided at the corners and corners of a bobbin-shaped core integrally formed with powder, so that chipping of the core could be eliminated and the strength could be improved.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is a diagram (part 1) for explaining a specific example of the present invention.

FIG. 3 is a diagram (part 2) for explaining a specific example of the present invention.

FIG. 4 is an explanatory view of the present invention and the prior art.

[Explanation of symbols]

 1: Flange part 2: Core part 3: Straight part 4: Grooves 5: Taper 11: Upper punch 12: Us 13: First lower punch 14: Second lower punch R surface: Surface with corners and corners with radius R C-plane: A plane with corners and corners formed by a straight length C

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuo Tokari 5-36-1 Shimbashi, Minato-ku, Tokyo Fuji Electric Chemical Co., Ltd. (72) Inventor Takeo Maeda 5-36-11 Shinbashi, Minato-ku, Tokyo Fuji Electrochemical Co., Ltd.

Claims (5)

[Scope of utility model registration request] 1. A bobbin type core integrally formed by filling powder into a die having circular flanges (1) at both ends of a circular core (2) and pressurizing the powder in a circular radial direction. Both ends were cut so that the cut surfaces of the flange portion (1) and the circular core portion (2) were parallel to the pressing direction, and the straight portion (3) was provided in a direction substantially perpendicular to the cut surface. Characteristic bobbin type core. 2. A bobbin type core integrally formed by filling powder into a mold having circular flanges (1) at both ends of a circular core (2) and pressing the powder in a radial direction of the circle. A bobbin type core, characterized in that a groove (4) is provided in the flange portion (1) in the pressing direction, and a circular core portion (2) is joined to the groove (4). 3. A bobbin type core integrally formed by filling powder into a mold having circular flanges (1) at both ends of a circular core (2) and pressing the powder in a radial direction of the circle. Both ends are cut so that the cut faces of the flange part (1) and the circular core part (2) are parallel to the pressing direction, and the straight part (3) is provided in a direction substantially perpendicular to the cut face, and the circular shape A bobbin type core, characterized in that a groove (4) is provided in the flange portion (1) in the pressing direction, and a circular core portion (2) is joined to the groove (4). 4. The bobbin type core according to claim 2 or 3, wherein the groove (4) is tapered from the core portion (2) toward the outer diameter direction. 5. The flange (1), the core (2) and the groove (4) according to claim 1 or claim 2 or claim 3 or claim 4, wherein the corners and corners are R-faces or C-faces. A bobbin-shaped core characterized in that