JPS5853328A - Metallic die for coiling - Google Patents

Abstract

PURPOSE:To flatten both side end faces of a U-coil, and also to obtain a parallel degree, by executing bend-forming by a punch and a die, which have been provided with an auxiliary mold and a spring on the body. CONSTITUTION:A positioning projecting part of a lower auxiliary die 7 is inserted into the center hole of a rectangular ringlike coil 23, is placed on the die 7, the coil 23 is softened by a current, etc., and a punch A is dropped to a die B. The coil 23 is prebent by center press recessed and projected surfaces 12, 21 of both auxiliary molds 7, 16, and when the punch A further drops, the coil 23 is further bent along both press recessed surfaces 10, 12 of the die B. In the end, when the punch A has dropped to the lowest position, the coil 23 is regularly bent by both press recessed and projected surfaces 10, 12, 18 and 21, and also both side end faces 23a, 23a of the rectangular ringlike coil 23 are pressed by both press planes 20, 20 of the punch A, respectively, and are molded to a flat surface.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a coil bending die for forming a U-shaped coil by bending a rectangular annular coil of a coil for electronic equipment such as a deflection coil in the width direction.

Generally, when forming a rectangular ring-shaped coil into a U-shaped coil 1 as shown in Fig. 1, electric current or hot air is used to soften it, but the shape 9 dimensions after forming are extremely important factors in terms of characteristics. . In other words, a good bend-forming coil is
As shown in FIG. 1, both end surfaces 1a, 1a are required to be flat and parallel, and when two bent U-shaped coils 1 are combined symmetrically, the gap is reduced. This is to provide a more uniform magnetic field distribution in the deflection coil or the like.

By the way, conventional coil bending is shown in Figures 2 to 4.
As shown in the figure, bending was performed using a coil bending die composed of an upper die 2 and a lower die 3. That is, the second
As shown in the figure, the rectangular annular coil 5 is placed on the auxiliary mold 4, and the upper mold 2 is lowered to the lower mold 3, and bending is performed as shown in FIG. However, with this coil bending mold, the molded U-shaped coil 5' has a drawback in that irregular bulges appear on both end faces 5a'15a', as shown in FIG.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a coil bending mold that allows both end faces of a U-shaped coil to be flat and parallel.

An embodiment of the present invention will be described with reference to FIGS. 5 to 9. That is, this coil bending die C consists of an upper die A and a lower die B as shown in FIG.

The lower mold B includes a lower main body 6, a lower auxiliary mold 7, and a lower spring 8.
and side plates 9,9. The lower main body 6 has a lower auxiliary lifting guide groove 11 in the valley of the press concave surface lO curved in only one direction. The lower auxiliary mold 7 has a central press concave surface 12 curved in only one direction on the upper part, and a positioning protrusion 13tl protrudes from the center of the central press concave surface 12, and an elevating guide rod protrudes from the lower surface of the central press concave surface 12. 14 is passed through the lower main body 6 from the bottom surface of the guide river 11 and is attached to the elevating guide groove 11 so as to be movable up and down. In this lower auxiliary mold 7, at the maximum downward position into the elevation guide groove 11, the central press concave surface 12 is continuous with the press concave surface IO of the lower main body 6, and a curved surface formed by both press concave surfaces 10 and 12. is set to have the same bending surface as the outer bending surface of the U-shaped coil 1 shown in FIG. The lower spring 8 is mounted on the lifting guide rod 14 and biases the lower auxiliary mold 7 to protrude above the lifting guide groove 11.

On the other hand, the upper mold A includes an upper main body 15, an upper auxiliary mold 16,
It consists of an upper spring 17. The upper main body 15 has an upper auxiliary lift guide #19tl on the top of the press convex surface 18 corresponding to the press concave surface 10, and a pair of pressing flat surfaces 20, 20 on both sides of the press convex surface 18 so as to be parallel to each other. Form a horizontal overhang. The upper auxiliary mold 16 has a central press convex surface 211 corresponding to the central press concave surface 12 at the lower part, and the central press convex surface 21
It has a positioning hole 22 (FIG. 6) in the center of which the positioning protrusion 13 can fit, and is attached to the lifting guide tIIt19 of the upper main body 15 so as to be able to move up and down. In this upper auxiliary mold 16, the central press convex surface 21 is at the maximum raised position into the elevating guide groove 19.
Continuing with the press convex surface 18 of No. 5, both of these press convex surfaces 18
．． A U-shaped coil 1 whose curved surface formed by 21 corresponds to that shown in FIG.
It is set to have the same bending surface as 11 of the bending surfaces.

The upper spring 17 is stretched between the upper main body 15 and the upper auxiliary mold 16, and urges the upper auxiliary mold 16i to protrude below the lifting guide groove 19.

The bending of the rectangular annular coil using this mold is carried out as shown in FIG.
Insert the positioning protrusion 13 of the rectangular annular coil 2.
3 is placed on the lower auxiliary mold 7, the rectangular ring coil 23tl is softened using electric current or hot air, and then the upper mold At-lower m
Descend to B. Then, as shown in FIG. 7, the rectangular annular coil 23 is first pre-bent by the central pressing concave and convex surfaces 12.21 of both auxiliary molds 7.16 (5), and when the upper mold A is further lowered, the eighth
As shown in the figure, the rectangular annular coil 23 is further curved and temporarily bent along both press concave surfaces 10.12 of the lower mB,
Finally, when the upper die A descends to the lowest position, the rectangular annular coil 23 is fully bent by the concave and convex surfaces 10, 12, 18, and 21 of both presses, as shown in FIG. The end faces 23a I 23a are pressed against both pressing planes 20 and 20 of the upper die A, respectively, and are formed into flat surfaces.

In this way, both end surfaces 23a of the rectangular annular coil 23 which have been fully bent by both pressing flat surfaces 20, 20 of the upper die A are
The coil 230 is formed into a U-shape by pressing #238 and can be finished flat.
It is also possible to obtain the parallelism of I 23a. In addition, coil both side end surfaces 23a by both press planes 20.20,
The press 23a is performed simultaneously when the rectangular annular coil 23 is subjected to preliminary bending (Fig. 7), provisional bending (Fig. 8), and (6) final bending (Fig. 9), so that the flat surface 20 for both presses is By pressing at a pressure of .20, the distribution of strain generated within the coil 23 becomes appropriate, and the coil 23 will not be damaged or cracked. Furthermore, the coil bending process can be performed extremely easily in one step, and the coil bending process can be performed stably, which has high industrial value.

As described above, the coil bending die of the present invention is a coil bending die consisting of an upper die and a lower die for bending a rectangular annular coil in the width direction, and the lower die is curved in only one direction. The lower main body has a lower auxiliary type elevating guide groove formed in the valley of the press concave surface, and a central press concave surface curved in only one direction on its upper part, and is arranged to be freely ascendable and descendable in the lower auxiliary type elevating guide groove. a lower auxiliary mold whose central press concave surface is continuous with the press concave surface of the lower main body at a position; and a one-part spring that biases the lower auxiliary mold upward; The upper main body has an upper auxiliary lifting guide groove formed on the top of the convex surface, and a pair of annular coil side end press planes extending parallel to each other on both sides of the press convex surface, and an upper main body with an upper main body having an upper auxiliary lifting guide groove formed on the top of the convex surface, and a pair of annular coil side end press flat surfaces extending parallel to each other on both sides of the press convex surface. an upper elevating mold having a central press convex surface corresponding to the press concave surface and disposed in the upper auxiliary type elevating guide structure such that it can be freely raised and lowered so that its own central press convex surface is continuous with the press convex surface of the upper main body in the raised position; Since it is equipped with an upper spring that biases the lifting mold downward, it has the effect that both end surfaces of the bent U-shaped coil are flat and parallel.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a U-shaped coil that has been well bent and formed, Fig. 2 is a schematic diagram of a conventional coil bending die, Fig. 3 is a diagram showing the pressed state by the coil bending die, and Fig. 4 5 is a perspective view of a U-shaped coil formed by the mold, FIG. 5 is a perspective view of a coil bending mold according to an embodiment of the present invention, and FIG.
9 to 9 are diagrams showing the coil bending process using the mold, respectively. A... Upper mold, B... Lower mold, 6... Lower body, 7.
...Lower auxiliary type, 8...Lower spring, 10...Press concave surface, 11...Lower auxiliary type lifting guide groove, 12...
Center press concave surface, 15... Upper main body, 16... Upper auxiliary mold, 17... Upper spring, 18... 7゛res convex,
19... Upper auxiliary type lifting guide groove, 20... Flat surface for press, 21... Central pressing convex surface, 23... Rectangular annular coil, 23a... End surfaces on both sides (9) Fig. 1 9 2 Figure 3 Figure 6 Figure 8 Figure 7 Figure 9

Claims (1)

[Claims] It consists of an upper mold and a lower mold for curve-molding a rectangular annular coil in the width direction, and the lower mold has a lower auxiliary type lifting guide groove formed in the valley of a press concave surface curved in one direction, and a lower main body and a lower mold. , a lower part having a central pressing concave surface curved in only one direction on its upper part, and disposed in the lower auxiliary lifting guide groove so as to be freely raised and lowered, so that in the lowered position, the central pressing concave surface of the self is continuous with the pressing concave surface of the lower main body; The U soil type includes an auxiliary mold and a lower spring that biases the lower auxiliary mold upward by 1, and the U soil mold has an upper auxiliary mold lifting guide groove formed at the top of the press convex surface corresponding to the press concave surface, and The upper auxiliary type lifting guide has an upper main body having a pair of ring-shaped coil end face brace planes extending parallel to each other on both sides, and a central press convex surface corresponding to the central press concave surface at its lower part. It is equipped with an upper elevating mold which is arranged in a groove so as to be freely raised and lowered so that its central press convex surface is continuous with the press convex surface of the curved soil section main body in the raised position, and an upper spring which biases the upper elevating mold downward. A coil bending mold.