JPS647018Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention mainly involves applying a voltage to a carbon electrode that is brought into pressure contact with a component to be brazed having a round outer peripheral surface such as a copper tube. The present invention relates to an electric brazing machine that is configured to heat and melt a brazing material using electrical resistance heat generated between the parts and bond members together.

A commonly known electric brazing machine of this type is the one shown in FIG. The copper tube 5 is placed so that a pair of carbon electrodes 1a' and 1b' are pressed against each other at approximately bisecting positions in the circumferential direction of the copper tube 5.
A' is sandwiched between the carbon electrodes 1a', 1b' and the copper tube 5a', and the copper tube 5a is heated using electric resistance heat between the carbon electrodes 1a' and 1b' and the copper tube 5a'. In order to bond the two carbon electrodes 1a' uniformly over the entire circumference, it is necessary to uniformly heat the outer periphery of the copper tubes 5a'.
It takes a considerable amount of time for the heat to be uniformly transferred from the contact point b' to the entire circumferential surface of the copper tube. Therefore, the conventional electric brazing machine equipped with only a pair of carbon electrodes 1a' and 1b' has poor working efficiency for large diameter pipes and has a narrow range of application for pipe diameters.

In view of the above-mentioned circumstances, an object of the present invention is to provide an electric brazing machine that is highly applicable and can braze even large-diameter members to be brazed with maximum efficiency.

The characteristic structure of the electric brazing machine according to the present invention, which was made to achieve the above object, is that the electric brazing machine is in contact with a virtual circle from the outside in the radial direction, and is constant or constant along the circumferential direction of the virtual circle. The present invention includes three or more carbon electrodes arranged in parallel with a substantially constant phase difference, and an advancing/retracting mechanism that advances and retreats each of the carbon electrodes to move the carbon electrodes by equal amounts in the radial direction of the virtual circle. .

The effects of the present invention having such a characteristic configuration are as follows.

In other words, even if the workpiece to be brazed has a large diameter, three or more carbon electrodes can be placed on the outer periphery of the workpiece with a constant or nearly constant phase difference to heat the workpiece in the most efficient arrangement, so that the workpiece can be heated efficiently in a short time compared to the conventional method. Moreover, by using the advance/retract mechanism to advance and retract each of the carbon electrodes by an equal amount in a constant direction, the workpiece can be adapted to the large and small diameters of the workpieces to be brazed, while still achieving the efficient arrangement on the outer periphery of each of the workpieces to be brazed. Therefore, the workpieces can be used in a state where maximum heating efficiency and maximum work efficiency can always be achieved regardless of the change in the diameter of the workpieces to be brazed.

Next, an embodiment of the configuration of the present invention will be described based on the drawings.

As shown in FIG. 1, a pair of half annular frames 14, 14 are connected to each other so as to be able to swing open and close around a horizontal axis P.
A round copper pipe 5a, which is an example of the brazing member 5, is shown in FIG.
Six carbon electrodes C are arranged in parallel with a constant phase difference along the outer circumferential surface of the copper tube 5a in this circle in a posture in contact with the outer circumferential surface of the copper tube 5a, and these carbon electrodes c are interlocked with each other by a plurality of gears 20. An operating section 2 is provided with a connecting screw mechanism 22 and is connected to the worm gear 20a.
An advancing/retracting mechanism A is provided which moves each of the carbon electrodes c toward the center of the copper tube 5a by an equal amount at the same time by the rotational operation of step 1.

By rotating the operation part 21, even if the copper tubes 5a have different outer diameters, each of the carbon electrodes c can be brought into contact with the outer peripheral surface of the copper tube 5a at approximately equal intervals. It is configured.

Note that although reference numerals are written in the claims section of the utility model registration for convenience of comparison with the drawings, the present invention is not limited to the structure of the attached drawings by such entry.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway overall plan view showing an embodiment of an electric brazing machine according to the present invention, and FIG. 2 is an overall plan view showing a conventional example. c...Carbon electrode, 2...Virtual circle, A...Advance/retreat mechanism.

Claims (1)

[Scope of utility model registration request] three or more carbon electrodes c arranged side by side with a constant or almost constant phase difference along the circumferential direction of the virtual circle 2 in a posture in contact with the virtual circle 2 from the outside in the radial direction; An electric brazing machine is provided with an advancing/retracting mechanism A that advances and retreats each of the carbon electrodes c and moves them by equal amounts in the radial direction of the virtual circle 2.