JP2014090623A - Bus bar material and bending jig therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that, most of bus bars are manufactured by punching a metal plate into an appropriate shape by means of a press and bending the punched metal plate at present but according to this method with which some metals are left from punching, yield is low and although there is a method of using a metal wire to manufacture the bus bar in order to solve such a problem, too, pressing or bending applied thereto is difficult unexpectedly and it is also difficult to accurately finish the bus bar.SOLUTION: A copper, aluminum or brass rod material of which the sectional shape is octagonal is used as a bus bar material. Bending work is implemented for bending the material at 90° or 45°. A jig is used which is formed by combining a punch and a die in which an intersectional portion of two right planes crossing each other at 90° or 45° is made round and in the two right planes and the round intersectional portion, a holding groove is engraved for fitting the bus bar material of which the sectional shape is octagonal, in a length direction.

Description

The present invention relates to a structure of a novel bus bar and its bending jig.

  The bus bar, which is one of the members used in the power supply line, has better heat dissipation than the wires, is suitable for systems with a large surface current due to its large surface area, and has a press nut in the terminal part. Therefore, it is used in various fields because of its good workability and so on.

  Currently, most bus bars are manufactured by cutting a metal plate into a suitable shape using a press and bending it. However, in this method in which undrawn parts occur, the yield is poor. Therefore, the present inventors considered that if a bus bar is manufactured using a metal wire, the waste of material does not occur theoretically and is suitable, and further research has been conducted.

  When a metal wire is used as a bus bar, it is necessary to perform partial press processing for forming the terminal portion and bending processing to follow spatial restrictions. The power supply source component and the power supply destination component are detoured and connected so as not to touch other components, and this detour direction is basically a 90 degree repetition. For example, after moving straight by 50 mm, the direction is changed 90 degrees and advanced 50 mm to the right, and the direction is changed 90 degrees and advanced 40 mm upward. As a special case, the direction may be changed by 45 degrees.

The terminal portion is formed in the same manner. For example, when the flat surface of the terminal portion formed by pressing one end is used as a reference plane, when the wire is bent 90 degrees, the reference plane is similarly turned 90 degrees. Basically, the other terminal portions are pressed so that the plane is the same as the reference plane or a plane rotated by 90 degrees.

JP 2012-170184 A

However, in practice, accurate bending and accurate pressing are difficult. More specifically, as described above, the bus bar is often subjected to bending and pressing at a plurality of locations.
At that time, the first processing (both bending and pressing) is not particularly difficult. From the second time, processing at an accurate angle is required based on the first processing, but when the wire is gripped and fixed, if the wire rotates even slightly in the gripping body (such as a vise), the design An angle cannot be obtained.

Furthermore, a jig is used for bending, but even if a certain degree of roundness (R) is given to the bending point, it is bent 90 degrees with a general jig (high-hardness metal with rounded edges). In this case, since the deformation associated with the outer extension and the inner contraction cannot be controlled well, the bent portion is deformed into an irregular shape and the beautiful finish is not achieved.

  Therefore, the present inventors have finally completed the present invention as a result of intensive studies in view of the above-mentioned points, and the feature thereof is that the bus bar material is a bar made of copper, aluminum or brass. Regarding the point that the cross section is a regular octagon, the bending jig is for bending a bar material made of copper, aluminum or brass and having a regular octagonal cross section to 90 degrees, and at 90 degrees. The intersecting portion of the two perpendicular planes that intersect each other is rounded, and the two perpendicular planes and the intersecting portion having the roundness are engraved with holding grooves for fitting the busbar material having an octagonal cross section in the longitudinal direction. It is in the point which consists of the combination of the punch and die currently provided.

That is, it can be said that the present invention is characterized by using a bar material having a regular octagonal cross section as the bus bar material.
The reason why the regular octagonal cross section is an ideal shape will be described below.
In general, bending work on a bar is done by holding the bar with equipment at both sides avoiding the part to be bent and moving the equipment or jig with the jig attached to the bent part. In order.
If this bending process is performed only once for one bar, it can be easily handled regardless of the cross-sectional shape of the bar.
However, it is not uncommon for a bus bar to be bent multiple times. A process of bending 90 degrees to the right and bending 90 degrees to the left at a position 50 mm away from the right is performed. In this “second and subsequent bending”, it is impossible to manufacture as designed unless the previous bending direction is accurately grasped.
However, in the case of a bar having a circular cross section, it is not easy to grip it. This is because it is difficult to prevent the wire rod from rotating around its central axis due to a large force applied during processing. If it rotates even a little, it will not be useful.
In order to prevent this, the cross-sectional shape of the wire can be solved by a polygon, and it can also be a polygon whose two opposite sides are parallel to each other. Square, regular hexagon, regular octagon, etc. are applicable. Although it can be said that a polygon with a larger number of sides may be used, in reality, since the side length that can be gripped by the equipment becomes smaller and rotation prevention becomes gradually difficult, the area around a regular square is the limit.
Next, as for bending, as described above, the processing performed on the bus bar is basically 90 degrees. The meaning of this basic angle of 90 degrees can be described in XYZ Cartesian coordinates. The bent portion of the wire bent at an included angle of 90 degrees is set as the origin, and the wire extending in two directions across the bending point is placed on the axis. When arranged, the wire whose direction is changed by the subsequent bending is always parallel to any of the three axes. This is “90-degree folding”.
However, in the bus bar arrangement, sometimes 90 degree bending is inconvenient. Many are due to space limitations, but in that case, a 45 degree bend is made. The 45 degree bend here is a concept that exists only when there are two or more bends, and bends 90 degrees in a direction that is 45 degrees with respect to the plane formed by the previous bend. Means that. Focusing only on the bent portion, the included angle is 90 degrees.
On the other hand, in the operation of gripping and bending the wire, it is reasonable to make the gripping direction and the direction of the force applied to bend the same. The equipment structure is simple and it is easy to maintain accuracy.
In summary, when a wire rod is selected as the bus bar material, it can be concluded that the cross-sectional structure is “regular octagon”.

  Furthermore, in the process of forming the present invention, the present inventors have a cross-sectional square from the viewpoint that the cross-sectional square may be used as long as it is a bus bar material that does not consider 45-degree bending (that is, only 90-degree bending). A processing experiment was conducted on the wire. However, the deformation of the bent part could not be controlled well, and it was not possible to bend the curve with a small curvature radius. Also in this respect, a regular octagonal cross section was suitable.

Next, regarding the jig used when bending the wire rod, the jig used by the present inventors is a steel ingot obtained by rounding the ridge line portion of the 90 ° angle between two planes. Met. Although bending was performed with the image of pressing the wire against the steel ingot, it was almost impossible to control the distortion of the cross-sectional shape as much as possible in the fateful bending process in which the inside shrinks and the outside stretches.
Then, when the concave groove was carved in two planes of this steel ingot, and the processing experiment was carried out as a combination of punch and die, the situation was dramatically improved.
That is, it is for bending a bar material made of copper, aluminum or brass and having a regular octagonal cross section to 90 degrees, and rounding the intersection of two perpendicular planes that intersect at 90 degrees, In addition, for the bending process formed by a combination of a punch and a die in which a holding groove for fitting a bus bar material having an octagonal cross section in the longitudinal direction is formed at the intersecting portion having the two perpendicular planes and the roundness. It is a jig.

The present invention relates to a bus bar material having a regular octagonal cross section made of copper, aluminum or brass, and a bus bar material having a regular octagonal cross section made of copper, aluminum or brass. The crossing portion of the two perpendicular planes that intersect at 90 degrees is rounded, and the busbar material having an octagonal cross section is formed in the two perpendicular planes and the rounded intersection portion. This is a bending jig formed by a combination of a punch and a die in which a holding groove for fitting in the longitudinal direction is formed, and is an extremely advanced invention having the following effects.
(1) Since the wire is used as a raw material, the yield is good unlike a conventional bus bar in which a metal plate is appropriately drawn.
(2) Since the cross section is a regular octagon, it is difficult to shift once gripped.
(3) Equipment for bending 90 degrees can be bent accurately if bent in the gripping direction, and the accuracy of the bending angle is high.
(4) Since the jig is engraved with holding grooves suitable for holding a wire with a regular octagonal cross section, the work becomes easy and the bending portion is distorted due to the combination of punch and die. Hateful.
(5) Since the cross section of the bus bar material is a regular octagon, it can be bent 45 degrees with one kind of jig.

It is a perspective view which shows an example of the bus-bar material which concerns on this invention. It is a perspective view which shows an example of the state which processed the bus-bar material of FIG. 1 and was set as the bus-bar. It is a perspective view which shows an example of the jig | tool used for a bending process. (A) (b) is a perspective view for description about 45 degree | times bending. It is a perspective view which shows the other example of a bus-bar structure.

  FIG. 1 is a perspective view showing an example of a bus bar material 1 (hereinafter referred to as “present invention material 1”) according to the present invention. As is apparent from the figure, the material 1 of the present invention has a regular octagonal cross section. The material is copper in this example, but may be aluminum or brass.

  Next, the state which processed the material 1 of this invention of FIG. 1 is shown in FIG. The bus bar 10 of this example has terminals 2 that are flattened by press working at both ends, and the middle wire portion is bent at five ABCDE locations in the drawing. The bending angles are all 90 degrees.

  These five foldings are performed by independent work. In this example, the B portion is processed after the bending processing at the A portion is completed, and the processing of C, D, and E is performed following the completion. Then, when all the bending processes are completed, both ends are pressed. In the processing of this example, the terminals 2 and 2 that are flattened by pressing are exactly parallel. Of course, this parallel accuracy must be ensured, but since the bending and pressing are performed on the basis of the pair of opposed surfaces of the peripheral surface of the material 1 of the present invention having a regular octagonal cross section, the accuracy is high. It becomes.

Next, an example of the jig 3 used for bending is shown in FIG. This jig 3 is composed of a combination of a punch 3a and a die 3b, and each includes two orthogonal surfaces 31, 32, a curved surface 33, and a holding groove 34 engraved across these surfaces. Have.
The holding groove 34 has a bottom surface parallel to the surface 31 (or 32). When the punch 3a and the die 3b are combined, each holding groove 34 has a cross-sectional shape obtained by dividing a regular octagon into two equal parts so that the cross-sectional shape of the material 1 of the present invention is obtained. ing.

The jig 3 bends the material 1 of the present invention by 90 degrees, but can also be bent by 45 degrees by selecting the peripheral surface of the material 1 of the present invention to be fitted in the holding groove 34.
This will be described with reference to FIGS.
A situation is assumed where bending is performed on the material 1 of the present invention which has already been bent at one or more places. The material 1 of the present invention illustrated in FIG. 1A has already been diffracted once at the P portion, and it is assumed that the second bending is performed.
Further, the bent portion P is bent 90 degrees with respect to the surface M in the peripheral surface of the material 1 of the present invention (having four peripheral surfaces of L, M, N, and O because it has a regular octagonal cross section). Suppose you have a song.
The two surfaces L and N adjacent to the surface M are both surfaces obtained by rotating the surface M by 45 degrees, and the case where the current bending process is performed based on one of these two surfaces L and N is particularly important. This is called 45-degree folding.
Therefore, when processing is performed with L or N applied to the bottom surface of the jig 3, the bending is 45 degrees. This is shown in FIG.
That is, if the material 1 of the present invention and the jig 3 are used, almost all of the usual bending processes assumed in the manufacture of bus bars can be performed.

Although not described in detail, the terminal portion formed by pressing may be provided at an intermediate position other than the end portion of the material 1 of the present invention. An example is shown in FIG. In the case of this example, the terminals 2 are formed at both ends, respectively, and the intermediate terminal 4 is formed in the middle by pressing or the like (of course, bending using the jig 3 is also applied to a plurality of locations. Have been). Since the press work in the middle part is designed in parallel to any one of the four pairs of peripheral surfaces of the material of the present invention, as in the end part, the surface angle accuracy is easily obtained.

DESCRIPTION OF SYMBOLS 1 Busbar material which concerns on this invention 2 Terminal 3 Jig 3a Punch side of jig 3b Die side of jig 31 surface 32 surface 33 Curved surface 34 Holding groove 4 Intermediate terminal 10 Busbar A Busbar bending location B Busbar bending location C Busbar bent part D Busbar bent part E Busbar bent part L Invention material surface M Invention material surface N Invention material surface O Invention material surface P Curved part

Claims (2)

  A bus bar material made of copper, aluminum or brass, and having a regular octagonal cross section.   A bar made of copper, aluminum or brass with a regular octagonal cross section for bending 90 ° or 45 °, rounded at the intersection of two perpendicular planes intersecting at 90 ° or 45 ° And a combination of a punch and a die in which a holding groove for fitting a bus bar material having an octagonal cross section in the longitudinal direction is engraved at the intersecting portion having the two perpendicular planes and the roundness. Bending jig.

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