JPS61129290A - Formation of electric contact surface of aluminum electric conductor - Google Patents

Abstract

PURPOSE:To execute easily welding under pressure in a short time, and to simplify manufacturing equipment by rotating a conductive plate-shaped body under pressure at a position which becomes an electric contact surface, and executing the welding under pressure by utilizing heat due to its frictional heat. CONSTITUTION:A jig for welding under pressure is provided with a revolving shaft 3, a pressure surface 7, and a gear-shaped piece 6 which can be inserted into a bolt hole 5. The center part of a clad material 1 is provided with a hole 8 having a projection 4 fitted to the gear-shaped piece 6, and the gear- shaped piece passes through the hole 8 and the bolt hole 5. In this state, when the revolving shaft 3 is rotated by applying a rolling down force, since the gear-shaped piece 6 and the projection 4 of the hole 8 are engaged with each other, the clad material 1 is pressed and rotated together with the revolving shaft 3. As a result, an oxide film of aluminum electric conductor is scraped,and removed to the outside by a centrifugal force. Also, by frictional heat of the clad plate 1 and the aluminum electric conductor 2, the aluminum electric conductor 2 and the clad material 1 are heated and welded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application 1] The present invention relates to a method for treating an electrical contact surface of an aluminum conductor, and particularly to a method for crimping a clad plate of silver/copper or the like onto an aluminum plate.

[Prior art] Conventionally, a clad plate made of silver/copper, etc. is crimped onto an aluminum plate to form an electrical contact surface of an aluminum bus bar, etc., and a good Δ electrical connection is obtained between the two. - One excellent method is to press-bond a clad plate with a three-layer structure of I/copper/aluminum solder to an aluminum plate via a solder layer.

[Problem to be Solved by the Invention 1] However, in order to reliably crimp the aluminum plate and the clad plate and obtain a good electrical contact surface using this method, it is necessary to Requires steps such as removing the oxide film on the surface, placing an aluminum solder layer on the silver/copper clad plate, heating under pressure after placing the clad material on the aluminum plate, and removing excess solder after pressing. There was a drawback.

The purpose of the present invention is to eliminate the above-mentioned drawbacks of the prior art, and to provide a method that removes the oxide film and heats and presses in one step when crimping a silver/copper clad plate to an aluminum plate, thereby achieving a good electrical connection. This paper attempts to provide a method for forming an electrically contacting surface of an aluminum conductor, and its gist is to add a conductive plate-like material to the position that will become the electrically contacting surface of an aluminum conductor. It is characterized in that the two are crimped using heat generated by friction, avoiding rotation while being compressed.

[Embodiments] Hereinafter, embodiments of the present invention will be described along with their effects with reference to the drawings.

FIG. 1 shows how a cladding material 1, which will become an electrical contact surface, is crimped using a bolt hole 5 for connection of an aluminum conductor 2.

The crimping jig includes a rotating shaft 3, a pressing surface 7, and a gear-shaped piece 6 that can be inserted into the bolt hole 5. On the other hand, Figure 2 is a plan view of a cladding material 1 made of a conductive material, in which there is a height 8 in the center having a protrusion 4 that fits snugly with the gear-shaped piece 6, and a float as shown in Figure 1. The shaped piece 6 passes through the hole 8 of the cladding material 1 and directly through the bolt hole 5. In this state, the rotary shaft 3 is rotated as shown in the figure while being applied with a reduction blade.

Since the gear-shaped piece 6 and the protrusion 4 of the hole 8 are engaged with each other,
The clad material 1 is pressed and rotatably stamped together with the rotary shaft 3.

First, the oxide film on the aluminum conductor 2 is scraped off and exposed to the outside by centrifugal force.

Furthermore, by avoiding rotation of the rotating shaft 3, the aluminum conductor 2 and the clad material 1 are thermally fused by the frictional heat between the clad plate and the aluminum conductor 2.

Although it is preferable to use a silver/copper clad material as the abrasive material for forming the above-mentioned electrical contact surface, the present invention is not limited to this.
It may be tin/copper, copper alone, or the like. In some cases, a three-layer cladding material such as silver/copper/aluminum solder may be used, and the aluminum solder layer may be used as an adhesive layer.

Further, the shape and number of the protrusions at the center of the cladding material are not limited to the shape and number of the embodiments, but may be sufficient as long as they can impart rotation to the cladding material.

Further, as described in 1 & above in the present invention, it is not necessary to remove the aluminum oxide film in advance during pressure bonding, but the oxide film may be removed in a separate process if desired.

[Effect of the Invention 1] According to the present invention, it is possible to shorten the time for processing the electric wire surface of an aluminum conductor, simplify the manufacturing equipment, and make it possible to extremely easily press-bond an aluminum plate and a copper-based clad plate.

[Brief explanation of the drawing]

FIG. 1 is an explanatory view showing an embodiment of the present invention, and FIG. 2 is a plan view showing an example of a cladding material used in the present invention. 1... Clad material, 2... Aluminum conductor, 3... Rotating shaft. 4... Protrusion that receives rotational force, 6... Gear-shaped piece 18.
...hole. No. 1 Closed (one piece on gearbox 4) No. 2 Akira

Claims (1)

[Claims] (1) A method for forming an electrically contacting surface of an aluminum conductor, in which a conductive plate is rotated under pressure at a position that will become the electrically contacting surface of the aluminum conductor, and the heat generated by the friction is used to press the two together.