JP7643385B2 - Lead shaping method and device - Google Patents

Description

The present invention relates to a lead shaping method and device.

Conventionally, methods for shaping the wiring (hereinafter referred to as "leads") of wiring components such as semiconductors include shaping using a mold or jig, bending with a bender, and the like, and various shaping methods have been established. For example, Patent Document 1 describes a method for bending the leads of a semiconductor device.

Japanese Patent Application Publication No. 6-120393

However, when each lead of a wiring component is straight, molding is not possible for each lead due to the narrow pitch, and all leads can only be molded together to the same shape, meaning that it is not possible to handle complex bent shapes, such as when it is desired to give each lead a different shape.

On the other hand, when bending with a bender, each lead can be processed into a different shape, but if the leads are rectangular wire, the bending process often results in twisting, making it difficult to meet requirements for dimensional accuracy at the level of ±0.1 mm.

The present invention was created in consideration of these points, and its purpose is to provide a lead shaping method and device that can shape rectangular wire leads with high dimensional accuracy and without causing twisting.

(First Aspect)
A first aspect of the present invention is a lead shaping method (1) for bending a plurality of leads (22) protruding in parallel from a wiring member (2), and includes a chucking step (12) and a bending step (13). The arrangement direction of the plurality of leads is defined as the X-axis direction, the extension direction of each lead is defined as the Y-axis direction, the direction perpendicular to the XY plane is defined as the top-to-bottom direction, and the rotation direction about a straight line perpendicular to the XY plane is defined as the θ direction.

At this time, when the wiring member is fixed on the receiving jig (3) so that the lead protrudes in the Y-axis direction, in the chucking step, the lead is clamped and fixed from two directions, the top and bottom directions, by a chucking device (4) that can move along the X-axis and Y-axis and rotate in the θ direction. In this chucking step, when the lead is fixed, a gap is left in the top and bottom directions on one of the two contact surfaces between the chucking device and the lead.

In the bending step, the chuck device clamps and fixes the lead while moving along the XY plane and rotating in the θ direction to bend the lead.

The receiving jig has multiple protrusions (33) arranged in parallel in the X-axis direction, which form grooves (31) that are open to the top and into which multiple leads can be fitted, and the ends (331) of the protrusions along the Y-axis that contact the outer sides of the leads in the X-axis direction are bent into an R shape for bending.

The lead shaping method of the first aspect of the present invention allows the rectangular wire leads of wiring components to be shaped with high dimensional accuracy and without twisting.

(Second Aspect)
A second aspect of the present invention is a lead shaping device (100) for bending a plurality of leads (22) protruding in parallel from a wiring member (2), comprising a receiving jig (3) and a chuck device (4). The arrangement direction of the plurality of leads is defined as the X-axis direction, the extension direction of each lead is defined as the Y-axis direction, the direction perpendicular to the XY plane is defined as the top-to-bottom direction, and the rotation direction about a straight line perpendicular to the XY plane is defined as the θ direction.

At this time, the receiving jig fixes the wiring member so that the leads protrude in the Y-axis direction. The receiving jig also has multiple protrusions (33) arranged in parallel in the X-axis direction, which form grooves (32) that open to the top so that multiple leads can be fitted into them, and the ends (331) of the protrusions along the Y-axis that contact the outer side of the leads in the X-axis direction are bent into an R-shape for bending.

The chuck device (4) can move along the X-axis and Y-axis and can rotate in the θ direction, clamping and fixing the lead from two directions, and while clamping and fixing the lead, moves along the XY plane and rotates in the θ direction to bend the lead. When fixing the lead, the chuck device leaves a gap in the θ direction on one of the two contact surfaces between the chuck device and the lead.

The lead shaping device of the second aspect of the present invention provides the same effects as the first aspect.

1A is a plan view showing the lead before shaping, and FIG. 1B is a plan view showing the lead after shaping. FIG. FIG. 2 is a perspective view showing a main part of the lead shaping device. FIG. 1A is a plan view showing a receiving jig, and FIG. 1B is a plan view showing the receiving jig and a wiring member. FIG. A diagram showing the problems with the chuck method. FIG. FIG. FIG. FIG. 11 is a perspective view showing a problem in Comparative Example 2. Flow showing the lead shaping method.

Below, several embodiments of the present invention will be described with reference to the drawings.

Figure 1(a) shows a wiring member 2 that is the subject of lead shaping. The wiring member 2 has multiple leads 22, each of which protrudes in parallel from a base 21. The shape of the leads 22 is a substantially rectangular wire. Note that the number "#n" is a temporary number given for later explanation, and is common to all drawings in which the leads 22 appear. In the following, "lead #n 22 shown in Figure 1" will simply be referred to as "lead #n 22".

The following embodiment is intended to make the leads 22 shown in FIG. 1(a) suitable for connection to other devices by shaping (bending) them into the shape shown in FIG. 1(b) to change the spacing between the leads 22 and by cutting off unnecessary portions on the ends to adjust the lead length, and is specifically intended to be used as an igniter lead for an automobile.

First Embodiment
[Lead shaping device]
The first embodiment of the present invention is a lead shaping device 100. This lead shaping device 100 bends a plurality of leads 22 protruding in parallel from a base 21 of a wiring member 2, and includes a receiving jig 3 and a chuck device 4.

Figure 2 shows an overall view of the shaping device 100 of this embodiment. The lead shaping device 100 is thus equipped with a single-axis servo cylinder and an electric actuator on each of the X and Y axes. It is also equipped with a servo motor and a reducer to enable rotation in the θ direction. The shaping device 100 combines these devices and operates the X-axis and Y-axis actuators and the θ-direction servo motor in cooperation with a three-axis NC (numerical control) to move the receiving jig 3 and chuck device 4 at the area enclosed by dotted lines in Figure 2 (Figure 3) and bend the lead 22.

Figure 3 shows the main parts of the shaping device 100 of this embodiment. This shows a scene in which the chucking device 4 chucks and bends the lead 22 #6 with the wiring member 2 placed on the receiving jig 3. In this invention, the arrangement direction of the multiple leads 22 is defined as the X-axis direction, the extension direction of each lead 22 as the Y-axis direction, the direction perpendicular to the XY plane as the top-to-bottom direction, and the direction of rotation about a straight line perpendicular to the XY plane as the θ direction. For comparison with Figure 3, Figure 4 shows the receiving jig 3 and wiring member 2 before shaping. This is the state before the lead 22 is chucked.

[Receiving jig]
5A shows the receiving jig 3 and its details. The receiving jig 3 fixes the wiring member 2 so that the leads 22 protrude in the Y-axis direction, and has a base receiving portion 31 (a portion with a matte finish) for receiving the base 21 of the wiring member 2, as well as a plurality of protrusions 31 arranged in parallel along the X-axis direction, which form grooves 32 open to the top side into which the plurality of leads 22 can be fitted. Of the protrusions 33, an end portion 331 along the Y-axis that contacts the outer side of the lead 22 in the X-axis direction is bent in advance into an R-shape for bending.

Figure 5 (b) shows the state of the wiring member 2 placed on the receiving jig 3 after the lead has been shaped. In order to bend it into this shape, the ends 331 of the convex portion 33 are each pre-shaped to a different shape. For example, the end 331 for bending the leads 22 of #1 and #6 is set to a bent R shape with the greatest curvature. On the other hand, the leads 22 of #2-3 are not bent, so the end 331 for receiving the lead 22 of #3, for example, is not bent R-shaped but is made approximately at a right angle, and serves to fit the lead 22 of #4 into the groove 32 and fix it in place so that the wiring member 2 does not fall off the receiving jig 3.

[Chuck device]
6 shows details of the chuck device 4. The chuck device 4 can chuck along the top-bottom direction, and can also move along the X-axis and Y-axis and rotate in the θ direction by the cooperative operation of the servos and actuators as described above. The chuck device 4 clamps and fixes the lead 22 from two directions, the top-bottom direction, and moves along the XY plane while rotating in the θ direction to bend the lead 22.

In Figure 3, the chuck slippage prevention guide 43 is only shown on one side of the upper chuck 41 in the X-axis direction, but in the chuck device 4 of this embodiment, the chuck slippage prevention guide 43 is provided on both sides of the upper chuck 41 in the X-axis direction (Figure 6), which reinforces the operation of the upper chuck 41 and prevents chuck slippage during bending.

<Chuck method>
In the chuck device 4 of the present invention, when the lead 22 is chucked and fixed, a gap δ is provided in the vertical direction on one of the two contact surfaces between the chuck device 4 and the lead 22 .

Here, we will explain how the chuck device 4 of the present invention provides a vertical gap δ when chucking the lead 22. Figure 7 shows the problems with bending using the chuck method. If bending is performed while the lead 22 is simply chucked and fixed from both vertical sides by the upper chuck 41 and the lower chuck 42 as shown in Figure 7(a), microscopic movement of material molecules and changes in the intermolecular bonding state occur as the material deforms, and the outer edge may be pulled, causing the bent shape to deviate from the standard, as shown in Figure 7(b), or the bent part may swell, causing deviations in dimensions or twisting, as shown in Figure 7(c).

Refer back to FIG. 6. In order to prevent the above-mentioned bending defects, when the chuck device 4 of the present invention chucks and fixes the lead 22, a gap δ is provided in the vertical direction on one of the two contact surfaces between the chuck device 4 and the lead 22. That is, a gap δ (delta) is provided in the vertical direction on either the contact surface between the fitting groove 411 on the underside of the upper chuck 41 and the upper surface 221 of the lead 22, or the contact surface between the upper end surface 422 of the lower chuck 42 and the lower surface 222 of the lead 22. As a result, the lead 22 can slide along the Y-axis direction, which suppresses undesirable material deformation and prevents bulging, twisting, and dimensional deviations in the bent portion.

In this embodiment, the lead 22 is first chucked from above and below with the upper chuck 41 and the lower chuck 42, and then the upper chuck 41 is pushed back by two stoppers 420 installed on the lower chuck 42 side, creating a gap δ on the upper surface side of the chuck device lead 22. This allows the upper chuck 41 to be stopped at a fixed size.

<Bending method>
Next, the chuck device 4 of the present invention performs bending while the lead 22 is chucked and fixed. Another problem with bending is the springback phenomenon of the bent material. To counter this springback, the chuck device 4 of this embodiment performs overbending (excessive bending) to correct the springback. This involves applying a load to the lead 22 so that it is bent beyond the target bending position, and bending the lead 22 so that it returns to the target bending position when the chuck state of the lead 22 is released.

Figure 8 shows a schematic diagram of the movements in the bending step 13. In detail, after the lead 22 is chucked (Figure 8 (1)), the lead 22 is bent with an overstroke (for example, +4-6° in the Y-axis direction) so as to bend the lead 22 beyond the target bending position (Figure 8 (2)), and when the chuck state is released, the lead 22 is returned to the target bending position, resulting in the overstroke being returned (Figure 8 (3)). This achieves the desired bending. Finally, the length of the lead 22 after bending is cut to the target length (Figure 8 (4)). In this embodiment, as described above, the above movements are performed by the cooperative operation of an XY-axis actuator and a θ-axis servo motor using a 3-axis NC (numerical control).

As described above, in the lead shaping device 100 of this embodiment, the wiring member 2 is placed on the receiving jig 3 so that the lead 22 protrudes in the Y-axis direction. The chuck device 4 chucks the lead 22, leaves a gap δ in the vertical direction, and moves along the XY plane to shape the lead by excessive bending that takes into account measures against springback.

Comparative examples of the present invention are shown in Figures 9-11. Generally, methods of shaping wiring components are known, such as shaping using a mold or jig, and bending using a bender. However, as mentioned above, shaping using a mold can only make all the leads the same shape (Figure 9), and bending using a bender (Figure 10) may cause twisting in the case of rectangular wire leads (Figure 11).

In response to these problems with the conventional technology, in the first embodiment of the present invention, a gap is created on one of the contact surfaces between the chuck device and the lead when bending the rectangular wire lead, allowing the lead to be shaped with good dimensional accuracy (±0.1 mm) without twisting, and can also be used when the pitch between the leads is narrow.

Second Embodiment
The second embodiment of the present invention is a lead shaping method 1. Fig. 12 shows the lead shaping method 1 of this embodiment. This involves bending a plurality of leads 22 protruding in parallel from a base 21 of a wiring member 2, and includes a preparation step 11, a chuck step 12, and a bending step 13. These steps are performed in this order. As in the first embodiment, the arrangement direction of the plurality of leads 22 is defined as the X-axis direction, the extension direction of each lead 22 as the Y-axis direction, the direction perpendicular to the XY plane as the top-to-bottom direction, and the rotation direction about a straight line perpendicular to the XY plane as the axis as the θ direction.

[Preparation steps]
The preparation step 11 is a step of fixing the wiring member 2 on the receiving jig 3 so that the leads 22 protrude in the Y-axis direction (see FIGS. 4-5). The details of the receiving jig 3 are similar to those in the first embodiment.

[Chuck step]
The chucking step 12 is a step in which the lead 22 is clamped and fixed from two directions, that is, in the vertical direction, by the chuck device 4 that can move along the X-axis and the Y-axis and can rotate in the θ direction (see FIGS. 2-3 and 6). The details of the chuck device 4 and the provision of a gap δ in the vertical direction are the same as those in the first embodiment.

[Bending process step]
The bending step 13 is a step in which the chuck device 4 performs bending while chucking and fixing the lead 22 (see FIG. 8). In this step, the chuck device 4 moves and rotates while fixing the lead 22, and performs bending of the lead 22 on the XY plane. At this time, overbending (excessive bending) is performed to perform springback correction, as in the first embodiment.

In the bending step 13 of this embodiment, in order to adjust the spacing by bending the multiple leads 22 protruding in parallel, the bending is performed from one side of the group of parallel leads 22 to the other, i.e., from lead 22 #1 to lead 22 #6. By bending the outer leads 22 first in this way, even if the group of leads 22 is parallel and arranged with a narrow pitch, the working space does not interfere when bending the inner leads 22.

As a result, the same effects as in the first embodiment are obtained.

Other Embodiments
In the above embodiment, it is assumed that the lead shaping device performs the work under NC control, but the implementation method of the present invention is not limited to the above example, and a robot may perform part or all of the work. Also, the wiring member is not limited to the igniter lead exemplified in the above embodiment, and any member having a similar shape can be applied.

The present invention is not limited to the embodiments exemplified above, and can be implemented in various forms without departing from the spirit of the invention.

REFERENCE SIGNS LIST 100 Lead shaping device 1 Lead shaping method 12 Chucking step 13 Bending step 2 Wiring member 22 Lead 3 Receiving jig 32 Groove portion 33 Convex portion 331 End portion 4 Chucking device

Claims (4)

A lead shaping method (1) for bending a plurality of leads (22) protruding in parallel from a wiring member (2), comprising the steps of:
The arrangement direction of the multiple leads is defined as the X-axis direction, the extension direction of each lead is defined as the Y-axis direction, the direction perpendicular to the XY plane is defined as the top-bottom direction, and the rotation direction about a straight line perpendicular to the XY plane is defined as the θ direction.
When the wiring member is fixed on a receiving jig (3) so that the leads protrude in the Y-axis direction,
a chuck step (12) for clamping and fixing the lead from two directions, namely, top and bottom directions, using a chuck device (4) that is movable along the X-axis and the Y-axis and rotatable in a θ direction;
a bending step (13) in which the chuck device clamps and fixes the lead while moving along an XY plane and rotating in a θ direction to bend the lead;
Including,
The receiving jig has a plurality of protrusions (33) arranged in parallel in the X-axis direction, the protrusions forming grooves (32) open to the top side so that the plurality of leads can be fitted therein, and ends (331) of the protrusions along the Y-axis that contact the outer sides of the leads in the X-axis direction are formed into a bent R shape for bending;
In the chucking step, when the lead is fixed, a gap is provided between two contact surfaces of the chucking device and the lead in the vertical direction. In the bending step,
The lead is bent so as to bend excessively beyond a target bending position.
2. The lead shaping method according to claim 1, further comprising the step of: releasing the chuck from the lead so that the lead returns to a target bending position. A lead shaping device (100) for bending a plurality of leads (22) protruding in parallel from a wiring member (2), comprising:
The arrangement direction of the multiple leads is defined as the X-axis direction, the extension direction of each lead is defined as the Y-axis direction, the direction perpendicular to the XY plane is defined as the top-bottom direction, and the rotation direction about a straight line perpendicular to the XY plane is defined as the θ direction.
a receiving jig (3) for fixing the wiring member so that the leads protrude in the Y-axis direction;
a chuck device (4) that is movable along the X-axis and the Y-axis and rotatable in the θ direction, clamps and fixes the lead from two directions, namely, the top and bottom directions, moves along the XY plane while clamping and fixing the lead, and rotates in the θ direction to bend the lead; and
Equipped with
The receiving jig has a plurality of protrusions (33) arranged in parallel in the X-axis direction, the protrusions forming grooves (32) open to the top side so that the plurality of leads can be fitted therein, and ends (331) of the protrusions along the Y-axis that contact the outer sides of the leads in the X-axis direction are formed into a bent R shape for bending;
The lead shaping device, when fixing the lead, provides a gap in the vertical direction between two contact surfaces of the chuck device and the lead. The chuck device is
The lead is bent so as to bend excessively beyond a target bending position.
4. The lead shaping device according to claim 3, wherein the lead is returned to a target bending position when the chuck state is released.

Images