JPH02151328A - Die and method for bending lead wire - Google Patents

Abstract

PURPOSE:To obtain the lead wire of the same shape whose strength is increased as a whole by forming the lead wire working surface of a section along a curve for bending the lead wire, and forming a stopper part erected roughly orthogonally from the working surface on an end point side of this working surface. CONSTITUTION:On the lower face of a lead wire bending use die 4, a guide groove 6 is formed and the lead wire working surface 7 formed on its bottom is formed in accordance with a curve for bending a lead wire 3. On the tip part of this working surface 7, a stopper part 5 is provided, and the tip part of the lead wire 3 which is brought to bending is guided to the stopper part 5 of the tip of the lead wire working surface 7 by the lead wire bending die 4. To the lead wire 3, stress is applied moderately as a whole along the curved surface of the lead wire working surface 7. In such a way, by only the up-and- down operation of the lead wire bending use die 4, the lead wire 3 having a prescribed shape, being free from a local bent state and having strong strength can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mold used for bending lead wires and a method for bending lead wires using the mold.

[Prior Art] In manufacturing conventional piezoelectric buzzers and piezoelectric sounders, lead wires (connection pins) that come into contact with piezoelectric diaphragms are processed as follows.

First, the first example is a method in which a bending piece 2 connected to a drive unit is brought into contact with an arbitrary part of a lead wire 3 whose one end is fixed to a component I as shown in FIG. 12, and the bending process is performed. be.

Next, the second example is a method in which a molding die is used in a separate pre-process to press-fit and fix a bent lead wire 3 that has been molded in advance into a component 1 made of plastic or metal as shown in Fig. 13. It is.

[Problems to be Solved by the Invention] However, each of the conventional lead wire processing methods described above has the following problems.

First, in the first example as shown in FIG.
The processing shape of the lead wire 3 is determined by the contact area of the bending metal piece 2 and the final stopping position of the bending metal piece 2. High positional accuracy is required for the folding device (not shown), and the device itself becomes quite expensive. Furthermore, when processing the lead wire 3, the bent metal piece 2 contacts only a portion of the lead wire 3, so the portion of the lead wire 3 that contacts the bent metal piece 2 is bent, and stress is concentrated there. There was a problem in that the mechanical strength of the lead wire 3 was weakened and the lead wire 3 was damaged at the bending portion in subsequent steps.

Next, in the second example as shown in FIG. 13, since the molding process is performed in advance using a molding die in the previous process, there is an advantage that the shape of the bent lead wire 3 is constant. When the bent lead wire 3 is press-fitted into the component I in the next step, the shape of the lead wire 3 may be deformed unless the lead wire 3 is handled carefully. For this reason, it is difficult to automate the process of press-fitting and fixing the lead wire 3 into the component 1, and the automatic assembly device becomes complicated and expensive. On the other hand, when it is done manually, there is a problem that the work efficiency is significantly reduced.

SUMMARY OF THE INVENTION Therefore, in order to solve the problems in the conventional example, an object of the present invention is to provide a mold for easily bending the lead wire 3 fixed to the two end side or the component l into a fixed shape, and a method for bending the lead wire 3. It is about providing.

[Means for solving the problem] That is, the present invention firstly provides a method for bending the tip of the lead wire 3 whose one end a111 is fixed to the component l according to a predetermined curve. Forming the lead wire processing surface 7 along the curve in which the lead wire 3 is to be bent,
A mold for bending lead wires is provided, characterized in that a stopper portion 5 is formed on the end point side of the lead wire processing surface, standing up substantially perpendicularly from the lead wire processing surface.

Furthermore, secondly, the lead wire 3 whose one end side is fixed to the component 1
Ahead of C'! In the method of bending the side according to a predetermined curve, the lead wire processing surface 7 of the mold material is formed along the curve on which the lead wire 3 is to be bent, and this guide groove 6
Using a lead wire bending mold 4 having a stopper portion 5 formed on the end point side of the lead wire, the stopper portion 5 standing up substantially perpendicularly from the lead wire processing surface, the tip of the lead wire 3 is bent in the axial direction of the lead wire 3. It comes into contact with the processing surface, the tip strongly hits the stopper part of the lead wire processing surface, and is further forcibly pushed in until the entire length of the lead wire 3 to be processed completely contacts the lead wire processing surface. A lead wire bending method is provided.

[Function] According to the lead wire bending mold and lead wire bending method according to the present invention, the lead wire processing surface 7 of the lead wire bending mold 4 is formed according to the curve on which the lead wire 3 is to be bent. Moreover, since the stopper portion 5 is provided at the tip of the processed surface 7, the tip of the lead wire 3 to be bent is bent by the lead wire bending mold 4, so that the tip of the lead wire processed surface 7 is bent. After the lead wire 3 is guided to the stopper portion 5, stress is naturally applied to the entire lead wire 3 along the curved surface of the lead wire processing surface 70. From this, lead wire 3
The bending process results in a uniform shape and strong strength without any local bending.

In addition, a lead wire bending device mainly using such a lead wire bending mold 4 can obtain a desired lead wire 3 by simply moving the lead wire bending mold 4 up and down. It can be easily and inexpensively produced and conveniently used.

[Embodiments] Next, embodiments of the present invention will be specifically described with reference to the drawings.

(a), (b), (c), and (d) of FIG. 1 are process diagrams using a lead wire bending mold 4 showing an example of the present invention in chronological order, FIG. 2 is a perspective view of the lead wire bending mold 4, and FIG. 3 is a bottom view of the lead wire bending mold 4.

As is clear from these figures, a guide groove 6 is formed on the lower surface of the processing die, and the lead wire processing surface 7 formed at the bottom of this guide groove 6 follows the curve of the lead wire 3 to be bent. It is formed according to. In FIG. 1, the left end side of this guide groove 6 is the lead wire insertion part 8 which is the insertion starting point side of the tip of the lead wire 3, and the right side thereof is the lead wire insertion part 8.
This is a stopper part 5 for stopping the tip of the lead wire 3 and applying a forced bending load to the lead wire 3, and this stopper part 5 stands up almost perpendicularly from the lead wire processing surface 7 of the guide groove 6. There is.

This machining mold also uses a driving device 11ff, such as a piston (not shown), from a position slightly above the position shown in FIG. , the lead wire 3 is forcibly lowered to the position shown in FIG. Then it returns to its original position.

The process during this time will be explained in more detail.

First, the processing die 4 is lowered as shown in FIG. Insert from the 8th side.

Next, as the lead wire bending die 4 is vertically lowered as shown in FIG. It is bent from the side, and its tip is guided to the stopper part 5 on the end point side of this guide groove 6. In this case, when the lead wire 3 to be processed has a slight bend, as shown in FIG.
The guide groove 6 is formed to have a wide width and gradually become narrower toward the stopper portion 5, so that bending of the lead wire 3 is easily tolerated to some extent.

Furthermore, in the process of being guided in an arc shape from the lead wire insertion portion 8 along the guide groove 6, the bending is corrected.

When pressure is further applied perpendicularly from above to the lead wire 3 which has stopped at the stopper portion 5 and has been deformed into an arched shape, the lead wire 3 will move to the lead wire processing surface of the guide groove 6 as shown in FIG. 1(C). The lead wire 3 inserted into the guide groove 6 is forcibly bent from a state where it is partially separated from the lead wire processing surface 7 until the entire lead wire 3 is in contact with the lead wire processing surface 7, as shown in FIG. 1(d). Thereby, the lead wire 3 which has undergone the desired bending process can be obtained.

The above is an embodiment of the lead wire bending method using the lead wire bending die according to the present invention.
Lead wire bending molds having cross-sectional shapes of the processed surfaces 7 as shown in FIGS. 4 to 7 are optimal for bending lead wires 3 of various shapes as shown in FIGS. 4 to 7. provided.

First, as shown in FIG. 4(a), the processing surface 7 has a guide groove 6 having a semicircular cross-sectional shape.
It is suitable for processing cylindrical lead wires 3 such as. Fourth
As shown in FIG. 8(b), the processing die 4 that grows the guide groove 6 having a triangular cross-sectional shape on the processing surface 7 has a cylindrical lead wire 3 as shown in FIG. 8(a) and a cylindrical lead wire 3 as shown in FIG. It is suitable for processing triangular prism-shaped lead wires 3 such as. As shown in Figure 4 (C),
The processing mold 4 having a guide groove 6 having a rectangular cross-sectional shape on the processing surface 7 can be used to form a cylindrical lead wire 3 as shown in FIG. 8(a) or a square columnar lead wire 3 as shown in FIG. 8(C). Suitable for processing.

In addition, when bending a plate-shaped lead wire 3 that is wide in the width direction as shown in FIG. 9(a), the bending rigidity in the width direction is higher than that in the thickness direction. The bending process can be performed even with the working die 4 in which the guide groove 6 is not particularly provided in the working die 7. Furthermore, when bending a lead wire 3 that has a protrusion 3a on a plate-shaped lead wire 3 that is wide in the width direction as shown in FIG. 9(b), It is desirable to form relief grooves 9. Furthermore, when such a protrusion 3a is provided, if the dimension ratio between the width direction and the thickness direction of the lead wire 3 is small (or the bending rigidity in the width direction is small), as shown in FIG. and run away: 14
It is preferable that the processing is carried out using a processing die 4 in which 9 is also formed.

Next, the processing die 4 shown in FIG. 1O has guide plate springs 10 and IO attached to both sides of the guide groove 6 formed on the processing surface 7. In this processing die 4, the tip of the lead wire 3 to be bent can be guided to the center of the guide groove 6 by the leaf springs 10, 10 on both sides. The working die 4 is shown with a pair of rollers 11.11 on the face 7.

Such a processing die 4 guides the tip of the lead wire 3 between the rollers 1131, for example, as shown in FIG.
c) It is suitable for bending the lead wire 3 having the shape as shown in FIG. 9(a).

The shape of the stopper part 5 provided in this lead wire bending die 4 prevents the tip Z111 of the lead wire 3 from coming off during processing.
On the other hand, when the lead wire bending die 4 is raised after processing,
In order to prevent the molded lead wire 3 from getting caught in the stopper portion 5, it is desirable that the molded lead wire 3 be slightly thicker than the thickness of the lead wire 3 (and further provided in a direction substantially perpendicular to the arc-shaped processed surface 7).

In addition, the lead wire bending device is lead wire bending type 4.
The structure allows the positional relationship between the lead wire 3 and the lead wire 3 to be changed arbitrarily,
In addition, it is preferable that the stop position [a] of the lead wire bending mold 4 after processing can also be changed arbitrarily. by this,
It is possible to increase the variation in the shape of the lead wire 3 without changing the lead wire bending die 4.

Although the above description has focused on the processing of connection pins of piezoelectric buzzers and piezoelectric sounders as an example of bending of lead wires, it goes without saying that the present invention can be applied to bending of other lead wires.

[Effects of the Invention] As is clear from the above description, according to the lead wire bending die and the lead wire bending method according to the present invention, lead wires 3 having the same shape and increased overall strength can be obtained. Can be bent.

[Brief explanation of the drawing]

FIGS. 1(a), (b), (c), and (d) are longitudinal cross-sectional process diagrams showing examples of the present invention in chronological order, and FIG. 2 is a diagram of a lead wire bending mold. FIG. 3 is a bottom view of the lead wire bending mold, and FIGS. 4 to 7 are main part cutaway views showing other examples of the lead wire bending mold. 8 and 9 are end views, and FIGS. 8 and 9 are perspective views showing various shapes of lead wires processed by the lead wire bending mold. FIGS. 10 and 11 are views of other lead wire bending molds. A longitudinal side view and a bottom view showing the embodiment, and FIGS. 12 and 13 are cross-sectional views showing an example of conventional lead wire bending processing. ■...Parts 2...Bending metal piece 3...Lead wire 4...Bending mold 5...Stopper part 6...
Guide groove 7...Machined surface 8...Kamiribe Patent Applicant: Taiyo Yuden Co., Ltd. Agent
Person Patent Attorney Kazuyoshi Hojo Figure 5 Figure 1 Figure 4 (b) (C) Figure 6 Figure 7Φ

Claims (2)

[Claims] (1) Connect the tip end of the lead wire with one end fixed to the component.
In a mold that bends according to a predetermined curve, the lead wire processing surface of the mold material is formed along the curve in which the lead wire is to be bent, and the end point side of this lead wire processing surface is approximately perpendicular to the lead wire processing surface. A lead wire bending mold characterized by forming a stopper portion that stands upright. (2) Connect the tip end of the lead wire with one end fixed to the component.
In the method of bending according to a predetermined curve, the lead wire processing surface of the mold material is formed along the curve in which the lead wire is to be bent, and the end point side of this lead wire processing surface is approximately perpendicular to the lead wire processing surface. Using a lead wire bending die formed with a stopper portion that stands up, the tip of the lead wire is brought into contact with the lead wire processing surface in the axial direction of the lead wire,
The tip strongly hits the stopper part of the lead wire processing surface,
The lead wire bending method further comprises forcibly pushing the lead wire until the entire length of the lead wire to be processed completely contacts the lead wire processing surface.