JPH06297142A - Brazing device - Google Patents

Abstract

PURPOSE:To enable, by a simple structure, the detection of reaching temperature suitable for brazing a work and to reduce unnecessary heating to the work. CONSTITUTION:To a brazing device which is provided with a wire feeding machine 1 for feeding wire 4 to the place 8 to be brazed of a work 7, a route 9 for an electric current is structured from the work 7 to the wire 4 through a power source 10. A detector 11 is provided by which the change from an energized state to unenergized state is detected by the separation between the wire 4 and the work 7 through the melting of the wire 4 in accordance with the heating of the work 7. Also, a controller 12 is provided by which the commencement of a brazing operation is instructed based on a signal from this detector 11.

Description

Detailed Description of the Invention

[0001]

This invention relates to brazing equipment,
More specifically, the present invention relates to a brazing apparatus capable of detecting that a workpiece to be heated has reached a brazable temperature.

[0002]

2. Description of the Related Art In a conventional brazing apparatus, it is necessary to heat a work by a burner or the like to a predetermined temperature during brazing, and a timer is used for controlling this heating. In other words, a timer is set for the approximate time until the work reaches the brazing temperature or higher, and after this time elapses, the wire is supplied to the brazing location to melt the wire.

[0003]

However, in the above brazing apparatus, the heating time required to reach the brazable temperature is delicately different each time due to differences in various conditions such as individual differences in individual works. The timer is usually set for a long time in consideration of safety. Therefore, even after the temperature of the work reaches the brazable temperature, extra heating is performed, and there is a problem that time loss, work overheating, and energy loss occur.

The present invention has been made in order to solve the above-mentioned conventional drawbacks, and an object thereof is to make it possible to detect when a work reaches a brazable temperature with a simple structure, thereby enabling a time. It is an object of the present invention to provide a brazing device capable of reducing a physical loss, a work overheat, and an energy loss.

[0005]

Therefore, the brazing apparatus of the present invention is a brazing apparatus having a feeder 1 for supplying a wire 4 to a brazing point 8 of a work 7, in which the work 7, power source 10, A current path 9 that connects the wires 4 is configured, and a detector 11 that detects when the current path 9 is switched from an energized state to a non-energized state and a brazing operation is started based on a signal from the detector 11. And a controller 12 for instructing.

[0006]

In the brazing device, when the work 7 is heated to the brazing possible temperature, the wire 4 contacting with the work 7 is melted and the work 7 and the wire 4 are separated from each other to be in the non-contact state. The current path 9 connecting the work 7, the power source 10, and the wire 4 changes from the energized state to the non-energized state. The detector 11 detects this change, and the controller 12 instructs the feeder 1 or the like to start the brazing operation based on this detection signal.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the brazing apparatus of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic diagram showing the overall configuration of an embodiment of the brazing apparatus of the present invention.

In the figure, 1 is a feeder, and 5 is a work mounting portion. The feeder 1 includes a motor-driven roller 2
And a nozzle 3 having a tapered taper shape, and is installed so as to be capable of reciprocating in the direction of the work attachment portion 5 by an air cylinder (not shown). The roller 2 feeds the brazing wire 4, and the nozzle 3 guides the wire 4 to the brazing point 8 of the work 7 on the work mounting portion 5. The work attachment part 5 is configured to fix the work 7 and to be rotatable by a motor 6 during a brazing operation.

Reference numeral 9 is a current path from the work 7 to the wire 4 via the power source 10. When both the work 7 and the wire 4 come into contact with each other, a closed path is formed and a current is supplied.

Reference numeral 11 is a detector. This detector 11 is
When the currents in the current path 9 are interrupted by the separation and connection of the both 4 and 7 and change from the energized state to the non-energized state, or vice versa, when the non-energized state and the energized state are changed, That is, the ON / OFF of the current in the current path 9
Is detected and is output as a signal to the controller 12 described later.

The controller 12 issues the following instruction based on the signal from the detector 11. That is, work 7
After the setting of, the work 7 and the wire 4 are not in contact with each other and the current path 9 is in the non-energized state, the wire 4
The feeder 1 is instructed to supply. When the wires 4 and 7 come into contact with each other due to the supply of the wire 4 and the current path 9 reaches the energized state, the supply of the wire 4 is stopped, and the wire feeding is performed to maintain the contact state of the both 4 and 7. Instruct machine 1. Further, when the work 7 is heated to reach the brazable temperature, that is, the wire 4 in contact with the work 7 is melted, the two 4 and 7 are separated from each other, and the current path 9 is brought into a non-energized state. At this time, the wire feed machine 1 and the motor 6 of the work mounting portion 5 are instructed to start the brazing operation. The brazing operation start instruction can be output after a predetermined time has elapsed after receiving the signal from the detector 11, and the brazing start timing can be managed.

The work 7 in the figure is a pair of tubes made of copper, and the brazing point 8 is such that the upper end of the lower tube is flared and the lower end of the upper tube is in this portion. It has a structure that is inserted.
A heating means for heating the work 7 up to the brazing temperature is a burner (not shown), and the heating is started after the work 7 is set on the work fixing portion 5.
The heating means may be a heater using high frequency.

In the apparatus having the above construction, when the work 7 is set on the work mounting portion 5, a burner (not shown) starts heating the work 7, and the feeder 1 is an air cylinder (not shown). And move it forward in the direction of the work attachment part 5.
The tip of the nozzle 3 is brought close to the brazing point 8.

Next, when the detector 11 detects that both the work 7 and the wire 4 are in the non-contact state, that is, the current path 9 is in the non-conducting state, the controller 12 gives an instruction based on this detection signal. Thus, the wire feeder 1 supplies the wire 4 to the brazing portion 8 of the work 7. When the tip of the wire 4 contacts the work 7 and the current path 9 is energized, the detector 11 detects this energization. Based on the detection signal of the detector 11, the controller 12 causes the feeder 1 to stop the supply of the wire 4, keep the contact state between the both 4 and 7 and start heating.

When the work 7 is heated up to the brazing temperature and the tip of the wire 4 in contact with the work 7 is melted and the current in the current path 9 is cut off, the detector 1
1 detects this. The brazing operation is started by an instruction from the controller 12 based on the detection signal of the detector 11.
That is, the roller 2 of the wire feeder 1 is rotated to start the supply of the wire 4, and at the same time, the motor 6 of the work mounting portion 5 is driven to rotate the work 7.

As described above, in the brazing apparatus in the above embodiment, the wire 4 which is in contact with the workpiece 7 when the workpiece 7 to be heated has reached the brazable temperature.
Is melted and detected by using the interruption of the current path 9,
Further, since the brazing operation can be started based on this detection, the work 7 is not heated more than necessary, and time loss, work overheating, and energy loss can be reduced.

The specific embodiments of the brazing apparatus of the present invention have been described above, but the present invention is not limited to the above embodiments, and various modifications can be made within the scope of the present invention. It is possible. For example, an operator or the like may perform the steps of setting the work 7 and then bringing the wire 4 and the work 7 in the non-contact state into contact with each other.

[0018]

As described above, in the brazing apparatus of the present invention, it is possible to detect that the work reaches the brazing temperature with a simple structure, and the brazing operation can be started based on this, so that the work can be started. It is possible to reduce time loss, work overheating, and energy loss because heating is not performed more than necessary.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing the overall configuration of an embodiment of a brazing device of the present invention.

[Explanation of symbols]

 1 Wire feeder 4 Wire 7 Work 8 Brazing point 9 Current path 10 Power supply 11 Detector 12 Controller

Claims (1)

[Claims] 1. A brazing part (8) of a workpiece (7),
In the brazing device having the wire feeder (1) for supplying the wire (4), a current path (9) connecting the work (7), the power source (10) and the wire (4) is formed, and
A detector (11) that detects that the current path (9) is switched from a conducting state to a non-conducting state, and a controller (12) that instructs the start of a brazing operation based on a signal from the detector (11). ) And a brazing device.