JPH04356360A - Soldering method and its device - Google Patents

Abstract

PURPOSE:To solder a processed member while keeping the soldered part of the member always at an optimized temperature. CONSTITUTION:A holding jig 31 which holds the processed member 32 is provided with a temperature sensor 34, a heater 33 and a controller P1 which sets a specified temperature for the jig 31, controls the supply of the soldering material and the soldering of the processed member in the specified temperature. High quality soldering to the processed member is constantly and efficiently carried out.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torch brazing method and apparatus, and more particularly to a brazing method and apparatus for performing brazing at a preset appropriate temperature.

0002

[Prior Art] In the conventional torch brazing method and apparatus, after heating the workpiece with a torch while holding the workpiece in a holding jig, a brazing material is supplied to a predetermined position of the workpiece. However, the workpieces were brazed.

0003

[Problems to be Solved by the Invention] In the conventional brazing method and apparatus described above, the holding jig that holds the workpiece in direct contact with the workpiece is Since the temperature of the holding jig and workpiece is not constant after heating is completed, the temperature of the holding jig and workpiece is not constant. However, after heating for a certain period of time, the brazing material is supplied from the brazing material supply means to a predetermined position of the workpiece, and brazing is started.

For example, when a workpiece is set in a state where the temperature of the holding jig is extremely low at the start of work, and the brazing material is supplied after being heated for a certain period of time by a heating means such as a torch, the temperature of the holding jig is Due to the temperature rise, heat is taken away and the workpiece may not reach the melting temperature of the brazing material, and the brazing material may not melt completely and enter the brazing gap sufficiently due to the unstable fluidity of the brazing material. Failure to do so may result in brazing failure, and this phenomenon is particularly noticeable in winter. In addition, if the workpiece is set during a large number of brazing operations and the temperature of the holding jig is extremely high, and the brazing material is supplied after being heated for a certain period of time by a heating means such as a torch, the workpiece The temperature rise is accelerated and the workpiece is heated above the appropriate brazing temperature, which increases the fluidity of the brazing material and causes dripping and insufficient brazing material, as well as thermal deterioration of the base material. This tendency is especially noticeable in the summer.

The present invention has been made in view of the current state of this type of brazing method and equipment described above, and its purpose is to maintain the temperature of the holding jig at an appropriate temperature at the start of work or after numerous brazing operations. It is an object of the present invention to provide a brazing method and an apparatus therefor in which workpieces are always brazed at an optimal temperature even under conditions where a large temperature difference may occur.

[0006]

[Means for Solving the Problems] In order to achieve the above object, a first embodiment of the present invention controls the jig temperature based on the temperature detected by a temperature sensor provided in the holding jig, and performs brazing. The second embodiment is a brazing method to start, and the second embodiment includes a holding jig for holding a workpiece at a processing position, a temperature sensor provided on the holding jig to detect the temperature of the holding jig, and a temperature sensor for detecting the temperature of the holding jig. The holding jig is configured to have a temperature adjusting means for adjusting the temperature detected by the temperature sensor so that the temperature detected by the temperature sensor becomes a predetermined temperature.The third embodiment includes a holding jig that holds the workpiece at a processing position; Temperature adjustment means for this holding jig;
A brazing material supply means for supplying a brazing material to a predetermined position of the workpiece, a heating means for heating the predetermined position to perform brazing, and a heating means provided on the holding jig to detect the temperature of the holding jig. The temperature sensor adjusts the temperature detected by the temperature sensor to a predetermined temperature, supplies the brazing material from the brazing material supplying means at the predetermined temperature, and supplies the brazing material to the workpiece by the heating means. The structure includes a control means for brazing the member.

[0007]

[Operation] With this configuration, the temperature of the holding jig that directly contacts and holds the workpiece is low at the start of work, so the temperature detected by the temperature sensor attached to the holding jig is set in advance. In order to raise the temperature of the holding jig by energizing the heater built into the holding jig so that the temperature reaches the appropriate predetermined temperature, the workpiece reaches the melting temperature of the brazing filler metal and the brazing filler metal melts. Enough penetration into the brazing gap to prevent brazing defects. When the temperature of the holding jig exceeds a predetermined temperature during numerous brazing operations, the temperature of the holding jig is lowered by air blowing, etc. to the appropriate temperature, and the solder is heated by a heating means such as a torch for a predetermined period of time. Providing appropriate fluidity to the material to ensure that the filler metal enters the brazing gap, preventing dripping of the filler metal, shortage of filler metal, and thermal deterioration of the base metal.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view showing essential parts of the present invention, FIG. 2 is a front view of the brazing apparatus, and FIG. 3 is a side view of FIG. 2.

As shown in FIGS. 2 and 3, a workpiece setting table 3 on which a workpiece to be brazed is placed is fixed to a pedestal 1 to which a heating unit 2 is attached. A base 5 and a base 6 are fixed to the upper surface of the mount 1, and one ends of swinging arms 6a and 6b are swingably attached to the base 5. Each heating unit 2 is swingably attached to the other end of 6b. A brazing material guide 15 is attached to the end of this heating unit 2, and a torch nozzle 11 is provided on the upper part via a bracket 11a, and the torch nozzle 11 is slid in the front and rear direction by a drive motor 36 during brazing. ing. On the other hand, the end of the piston 8, which is movably inserted into the air cylinder 7, is swingably held at the end of the base 5, and the air cylinder 7 is slidably fixed to the swing arm 6a. be. A stopper 10 is fixed to the base 6. Although not completely shown, on the pedestal 1 there is a stopper 10 and swing arms 6a, 6 with the structure described above.
Two sets of heating units 2 held at b are attached.

[0011] Also, a brazing material supply device 12a is provided on the back side of the pedestal 1.
, 12b are held, and these brazing material supply devices 12
A brazing material supplied from a and 12b via a brazing material supply guide 15 to a predetermined position of the workpiece 32 near the outlet of the torch nozzle 11 is wound. A brazing material feeder 16 is attached to the upper surface of the pedestal 1, and the operation of the brazing material feeder 16 causes the brazing material feeder 1 to
The amount of brazing filler metal supplied from 2a and 12b to a predetermined position of the workpiece 32 of the torch nozzle 11 of the corresponding heating unit 2 is adjusted.

As shown in FIG. 2, a control panel P1 is provided on the side surface of the pedestal 1, and includes a brazing material supply control section 20, an air cylinder control section 21, a gas mixing control section 22, and a temperature control section 25. A piping box P2 equipped with a compressed air supply device 23 is provided above the control panel P1. Then, the mixture ratio of combustible gas and oxygen, the gas supply flow rate and supply time (
control of timing) is performed. Similarly, the air cylinder control unit 21 controls the pressure of compressed air in the compressed air supply unit 23 and the amount of compressed air supplied to the air cylinder 7. The swinging timing of the swinging arms 6a, 6b is adjusted to bring the swinging arms 6a, 6b closer to a predetermined position on the workpiece 32. Furthermore, the brazing material feeder 16 is operated under the control of the brazing material supply control section 20, and the brazing material supplying devices 12a, 12
The timing and amount of brazing material supplied from b to a predetermined position of the workpiece 32 via the delivery pipe 15a and the brazing material supply guide 15 are controlled.

Furthermore, the temperature control section 25 performs control based on the detection signal from the temperature sensor 34 so that the holding jig 31, which will be described later, reaches a preset appropriate temperature.

Windproof plates 3a are provided on both sides of the work set table 3.
, 3b are provided, and a frame plate is provided on the outer peripheral edge of the work set table 3 to prevent the brazing frame (flame) from being affected by wind from the outside.

In the brazing apparatus having such a configuration, in the present invention, as shown in FIG. A workpiece 32 to be subjected to brazing is placed. The holding jig 31 also includes a heater 33 for preheating and a temperature sensor 3 for temperature detection.
4 is embedded. Furthermore, air cooling nozzles 35 for blowing air onto the holding jig 31 are disposed adjacent to both sides of the holding jig 31 and connected to compressed air piping (not shown).

Next, the brazing operation in the embodiment will be explained.

First, when the power is turned on and the start button of the control device is operated, the temperature of the holding jig 31 is measured by the temperature sensor 34. If the temperature is lower than a predetermined temperature such as when starting work, the temperature is sent to the heater 33 embedded in the holding jig 31. energization starts,
The holding jig 31 is preheated until it reaches a predetermined temperature. When the holding jig reaches a preset temperature determined by the temperature sensor 34, the power to the heater 33 is turned off.
controlled. Completion of preheating of the holding jig 31 is confirmed by the lamp of the control device P in this manner, and the workpiece 32 is positioned and fixed in the holding recess 31a of the holding jig 31.

Thereafter, when the gas mixture control unit 22 is operated, the mixture ratio and supply pressure of the mixed gas of combustible gas and oxygen to be supplied to the torch nozzle 11 are set, and the torch nozzle 1 is
1 is lit on low heat. Therefore, by controlling the air cylinder control section 21 to swing the swinging arm 6, the heating unit 2 is moved toward the workpiece 32 side, and the torch nozzle 11 is moved close to the brazing position of the workpiece 32. let

In this manner, the gas mixture control section 2
2 to bring the mixed gas supplied to the torch nozzle 11 of the heating unit 2 into a high flame state for temperature raising, and the torch nozzle 11 is reciprocated via the bracket 11a in a heating mode preprogrammed by the drive motor 36. , the brazing portion of the workpiece 32 is heated uniformly. When the temperature of the brazed portion reaches a predetermined temperature (for example, 600° C.), the mixed gas supplied to the torch nozzle 11 becomes a medium heat-retaining state, and that temperature is maintained. Next, by controlling the brazing material supply control unit 20, the brazing material feeder 16 is operated to arrange the brazing material at a predetermined length with respect to the outlet of the torch nozzle 11 via the brazing material supply guide 15. Then, brazing is automatically performed while feeding the brazing material from the brazing material supply device 12 according to the consumption amount.

[0020] When the brazing is completed, the torch nozzle 11
The mixed gas supplied to the is used as a pilot flame, the heating unit 2 moves in a direction away from the work set table 3, and the brazed workpiece 32 is unloaded from the work set table 3 to begin the brazing operation. is completed.

Therefore, even if the brazing operation is interrupted for some reason, proper brazing can be immediately continued when restarted.

On the other hand, if such brazing work is repeated for a long time and the temperature of the holding jig 31 exceeds the appropriate temperature at the start of the next brazing, the temperature sensor 34 detects this temperature and the air cooling nozzle 35 The holding jig 31 is cooled by air blowing under the control of the temperature control section 25, and the holding jig 31 is lowered to an appropriate temperature.

In the above embodiment, the heater 33 embedded in the holding jig 31 was shown as the heating means, but flame heating may also be used, and the air cooling nozzle 3 was used as the cooling means.
5, the holding jig 31 may be configured to flow a refrigerant such as water or air. In addition, the air cooling nozzle 35
It is also possible to shorten the brazing cycle time by installing the brazing machine at a higher position than the workpiece and using it to cool the workpiece after brazing.

In this way, in the embodiment, brazing is always started from a predetermined temperature of the holding member 31 that holds the workpiece 32, so that brazing can be performed quickly under appropriate temperature conditions.

[0025]

Effects of the Invention As described in detail above, in the present invention, a heater and a temperature sensor are provided in a holding jig for holding a workpiece, and a control means is used to maintain the holding jig at a predetermined temperature before starting brazing. The brazing process is controlled so that the brazing process always starts at a predetermined temperature by heating with a heater, etc., and cooling with an air-cooling nozzle, etc., so that the brazing metal can properly enter the brazing gap regardless of whether it is winter or summer. This makes it possible to stably and efficiently perform high-quality brazing on workpieces without causing brazing defects and preventing dripping of the brazing filler metal and thermal deterioration of the base material.

[Brief explanation of drawings]

FIG. 1 is a plan view showing essential parts of the present invention.

FIG. 2 is a front view of the brazing device of the present invention.

FIG. 3 is a side view of FIG. 2;

[Explanation of symbols]

2 Heating unit 6a, 6b Swing arm 11 Torch nozzle 31 Holding jig 32 Worked parts 33 Heater 34 Temperature sensor

Claims (4)

[Claims] 1. A brazing method comprising controlling the jig temperature based on the temperature detected by a temperature sensor provided in a holding jig and starting brazing. 2. A holding jig for holding a workpiece at a processing position, a temperature sensor provided on the holding jig for detecting the temperature of the holding jig, and a temperature sensor for detecting a temperature at a predetermined temperature. 1. A brazing device characterized by comprising: temperature adjustment means for a holding jig to adjust the temperature of the holding jig so that the temperature of the holding jig is adjusted to 3. A holding jig for holding a workpiece at a processing position, a temperature adjusting means for the holding jig, a brazing material supplying means for supplying a brazing material to various predetermined positions of the workpiece, and the a heating means for brazing by heating a predetermined position; a temperature sensor provided on the holding jig for detecting the temperature of the holding jig; A brazing apparatus comprising: a control means for adjusting by an adjusting means, supplying a brazing material from the brazing material supplying means at the predetermined temperature, and brazing the workpiece by the heating means. . 4. The brazing apparatus according to claim 2, wherein the temperature adjusting means comprises an electric heater for raising the temperature of the jig and an air blower for cooling the jig.