Lead shaping method and device

Abstract

To provide a lead shaping method capable of shaping a flat wire lead of a wiring member with high dimensional accuracy and without generating torsion.SOLUTION: The present invention relates to a lead shaping method 1 for performing bending processing on a plurality of leads 22 protruding in parallel from a wiring member 2. An aligned direction of the plurality of leads is defined as an X axis, an extension direction of each lead is defined as a Y axis, a direction orthogonal to an XY plane is defined as a top-and-bottom direction and a rotation direction with a straight line orthogonal with the XY plane defined as an axis is defined as a θ direction. The lead shaping method includes: a chuck step 12 of interposing the leads 22 from two directions in the top-and-bottom direction to hold the leads, by a chuck device 4 which is operable along the X axis and the Y axis and rotatable in the θ direction, when the wiring member 2 is fixed onto a receiving jig 3 in such a manner that the leads 22 protrude in the Y axis direction; and a bending processing step 13 of performing the bending processing on the leads 22 while fixing the leads 22 by the chuck device 4. In the chuck step 12, when fixing the leads, a clearance in the top-and-bottom direction is secured between two abutment surfaces of the chuck device 4 and the leads 22.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a lead shaping method and apparatus. [Background technology]

[0002] Conventionally, as a method for shaping wiring (hereinafter referred to as "leads") of wiring members such as semiconductors, shaping using a mold or jig, bending with a bender, etc., have been known, and various shaping methods have been established. For example, Patent Document 1 describes a method for bending leads of a semiconductor device. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 6-120393 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when each lead of the wiring component is straight, molding is not possible for each lead due to the narrow pitch, and only all the leads can be molded together to the same shape. This means that it is not possible to handle complex bent shapes, such as when it is desired to give each lead a different shape.

[0005] On the other hand, with bending using a bender, it is possible to process each lead into a different shape, but if the leads are rectangular wire, the bending process often results in twisting, making it difficult to handle cases where dimensional accuracy at the level of ±0.1 mm is required.

[0006] The present invention has been made in consideration of these points, and its object is to provide a lead shaping method and device that can shape rectangular wire leads with high dimensional accuracy and without causing twisting. [Means for solving the problem]

[0007] (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.

[0008] 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 in the top-bottom direction by a chucking device (4) that can move along the X-axis and Y-axis and can rotate in the θ direction. In this chucking step, when the lead is fixed, a gap is provided in the top-bottom direction on one of the two contact surfaces between the chucking device and the lead.

[0009] 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.

[0010] 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 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 formed into a bent R shape for bending processing.

[0011] According to the lead shaping method of the first aspect of the present invention, the rectangular wire leads of the wiring member can be shaped with high dimensional accuracy and without twisting.

[0012] (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.

[0013] 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 are open to the top so that the multiple leads can be fitted into them, 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.

[0014] The chuck device (4) is operable along the X-axis and Y-axis and rotatable in the θ direction, clamps and fixes the lead from two directions, up and down, and while clamping and fixing the lead, moves along the XY plane and rotates in the θ direction to bend the lead. When the chuck device fixes the lead, it leaves a gap in the up and down direction on one of the two contact surfaces between the chuck device and the lead.

[0015] The lead shaping device according to the second aspect of the present invention provides the same effects as those of the first aspect. [Brief description of the drawings]

[0016] [Figure 1] (a) Plan view showing the lead before shaping, (b) plan view showing the lead after shaping. [Diagram 2] FIG. [Diagram 3] FIG. 2 is a perspective view showing a main part of the lead shaping device. [Figure 4] FIG. [Diagram 5] FIG. 4A is a plan view showing the receiving jig, and FIG. [Figure 6] FIG. [Figure 7] A diagram showing the problems with the chuck method. [Figure 8] FIG. [Figure 9] FIG. [Figure 10] FIG. [Figure 11] FIG. 11 is a perspective view showing a problem in Comparative Example 2. [Figure 12] Flow showing the lead shaping method. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, several embodiments of the present invention will be described with reference to the drawings.

[0018] Fig. 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 lead 22 appears. Hereinafter, "lead 22 #n shown in Fig. 1" will simply be referred to as "lead 22 #n".

[0019] In the following embodiment, the leads 22 shown in FIG. 1(a) are shaped (bent) into the shape shown in FIG. 1(b) to change the spacing between the leads 22, and unnecessary portions on the ends are cut off to adjust the lead length, making the leads suitable for connection to other devices. Specifically, this embodiment is intended as an igniter lead for an automobile.

[0020] (First embodiment) [Lead shaping device] The first embodiment of the present invention is a lead shaping apparatus 100. This lead shaping apparatus 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.

[0021] Fig. 2 shows an overall view of the shaping device 100 of this embodiment. The lead shaping device 100 thus includes a single-axis servo cylinder and an electric actuator on each of the X-axis and Y-axis. It also includes 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 the dotted line in Fig. 2 (Fig. 3), thereby bending the lead 22.

[0022] FIG. 3 shows the main part of the shaping device 100 of this embodiment. This shows a scene where the chuck device 4 chucks and bends the lead 22 #6 with the wiring member 2 placed on the receiving jig 3. In the present invention, the arrangement direction of the 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. For comparison with FIG. 3, FIG. 4 shows the receiving jig 3 and the wiring member 2 before shaping. This is the state before the lead 22 is chucked.

[0023] [Receiving jig] 5(a) 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 portion 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 leads 22 in the X-axis direction is bent in advance into an R-shape for bending.

[0024] 5(b) shows the state of the wiring member 2 placed on the receiving jig 3 after the leads have been shaped. In order to bend the wiring member 2 into this shape, the ends 331 of the convex portion 33 are each formed into a different shape in advance. For example, the end 331 for bending the leads 22 of #1 and #6 is set to a bent R shape with the largest 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 formed at a substantially right angle, and serves to fit and fix the lead 22 of #4 into the groove 32 so that the wiring member 2 does not fall off the receiving jig 3.

[0025] [Chuck device] Fig. 6 shows details of the chuck device 4. The chuck device 4 can chuck in the vertical direction, and can also move along the X-axis and Y-axis and rotate in the θ direction by the cooperative action of the servos and actuators as described above. The chuck device 4 clamps and fixes the lead 22 in two directions, the vertical direction, and moves along the XY plane while rotating in the θ direction to bend the lead 22.

[0026] Although FIG. 3 illustrates the chuck slippage prevention guide 43 on only one side of the upper chuck 41 in the X-axis direction, in the chucking 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 (FIG. 6), which serves to reinforce the operation of the upper chuck 41 and prevent chuck slippage during bending.

[0027] <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 .

[0028] Here, the provision of a vertical gap δ when the chuck device 4 of the present invention chucks the lead 22 will be described. 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 and horizontal sides by the upper chuck 41 and the lower chuck 42 as shown in Figure 7(a), microscopic movement of the material molecules and changes in the intermolecular bonding state occur as the material deforms, and the outer edge may be pulled and the bent shape may deviate from the standard as shown in Figure 7(b), or the bent part may swell and cause dimensions to be out of spec or twisting as shown in Figure 7(c).

[0029] 6 again. 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 lower side 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, dimensional deviation, etc. of the bent portion.

[0030] In this embodiment, the lead 22 is first chucked from above and below by 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, thereby leaving a gap δ on the upper surface side of the chuck device lead 22. In this way, the upper chuck 41 is stopped at a fixed size.

[0031] <Bending method> Next, the chuck device 4 of the present invention performs bending while the lead 22 is chucked and fixed. Another issue 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.

[0032] FIG. 8 shows a schematic diagram of the movement of the bending step 13. In detail, after the lead 22 is chucked (FIG. 8(1)), the lead 22 is bent with an overstroke (for example, +4-6° with respect to the Y-axis direction) so as to bend the lead 22 excessively from the target bending position (FIG. 8(2)). When the chuck state is released, the lead 22 is returned to the target bending position, and as a result, the overstroke is returned (FIG. 8(3)). This achieves the desired bending. Finally, the length of the lead 22 after bending is cut to the target length (FIG. 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 three-axis NC (numerical control).

[0033] 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 leads 22 protrude in the Y-axis direction. The chuck device 4 chucks the leads 22, leaves a gap δ in the vertical direction, and moves along the XY plane to perform lead shaping by excessive bending while taking into consideration measures against springback.

[0034] Comparative examples of the present invention are shown in Figures 9 to 11. Generally, methods of shaping wiring components are known, such as shaping using a mold or jig, and bending with a bender, but as mentioned above, shaping with a mold can only make all the leads the same shape (Figure 9), and bending with a bender (Figure 10) may cause twisting in the case of rectangular wire leads (Figure 11).

[0035] In response to these problems with the conventional technology, in the first embodiment of the present invention, a rectangular wire lead is bent with a gap opened on one of the contact surfaces between the chuck device and the lead, making it possible to shape the lead with good dimensional accuracy (±0.1 mm) without twisting, and also making it possible to accommodate narrow pitches between the leads.

[0036] 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 method 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 chucking 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.

[0037] [Preparation Step] 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.

[0038] [Chuck step] The chucking step 12 is a step in which the lead 22 is clamped and fixed from two directions in the vertical direction by the chuck device 4 that can move along the X-axis and Y-axis and 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.

[0039] [Bending process step] The bending step 13 is a step in which the chuck device 4 performs bending while chucking 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.

[0040] 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, that is, from the #1 lead 22 to the #6 lead 22. By bending the outer leads 22 first in this manner, even in the group of leads 22 arranged in parallel with a narrow pitch, the working space does not interfere when bending the inner leads 22.

[0041] As a result, the same effects as in the first embodiment are obtained.

[0042] (Other embodiments) In the above embodiment, it is assumed that the lead shaping device is operated under NC control, but the embodiment of the present invention is not limited to the above example, and a robot may be used to perform part or all of the work. Also, the wiring member is not limited to the igniter lead illustrated in the above embodiment, and any member having a similar shape can be used.

[0043] As described above, the present invention is not limited to the forms exemplified in the above-mentioned embodiments, and can be embodied in various forms without departing from the spirit of the present invention. [Explanation of symbols]

[0044] 100 Lead shaping device 1 Lead shaping method, 12 Chuck step, 13 Bending step 2 wiring components, 22 leads 3 receiving jig, 32 groove portion, 33 protrusion portion, 331 end portion 4 Chuck device

Claims

1. 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, the top and bottom directions, using a chuck device (4) that is movable along the X-axis and the Y-axis and rotatable in the 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.

2. 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.

3. 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.

4. 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.

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