JPS629769A - Method and apparatus for brazing - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Field of application of the invention] The present invention relates to a brazing method and apparatus.

In particular, the present invention relates to a brazing method and apparatus suitable for controlling the temperature of joints of parts to be brazed to ensure reliable brazing.

[Background of the invention]

Conventionally, parts were brazed together by one manual resistance brazing process. Namely.

As shown in FIG. 6, one worker visually controls the temperature of the joint between parts 8 and 10, and energizes the welding machine 16 connected to the power source 40 intermittently using the foot switch 15 to control the joint. The temperature was raised, and when the brazing temperature was reached, silver solder 20 with flux was inserted, and the temperature was stabilized by intermittent energization until the silver solder 20 was completely covered. For this reason, brazing takes a long time, and since energization is carried out intermittently with one foot, as shown in Figure 7, it requires skill to maintain a constant temperature TO, and the temperature rise is unstable. There was a problem. Furthermore, there is a problem in that the work environment is bad for workers because flux vapor is generated. It was also difficult to spread the silver solder uniformly over the entire joint. In addition, as shown in Figure @8, a heating element 6 made of carbon is placed on the lower electrode 4, and a thermocouple 5 is connected to the heating element 6 to a temperature measuring device 52.
2α is fixed, the temperature of the 1 heating element 6 is measured, and based on the output, the current of the welding machine 16 is controlled by the control device 50 equipped with the ON time control relay 50α and the OFF time control relay 50b as shown in Figure @9. It is conceivable to control the temperature of the heating element 6 within a predetermined range with respect to a constant temperature control by intermittent predetermined time periods of tl-, t2. However, in this method, it is not possible to directly measure the temperature of the joint between parts 8 and 10, and when the work is repeated, the temperature of the heating element 6 does not decrease, and the temperature of the heating element 6 and the supplied parts 8 and 10 cannot be measured directly. There was a problem in that a temperature difference occurred between the parts 10 and the part 10, making it impossible to accurately control the temperature of the joint.

[Purpose of the invention]

An object of the present invention is to provide a brazing method and apparatus that can reliably perform brazing.

[Summary of the invention]

The present invention provides a brazing method in which parts to be brazed are
and a heating element provided opposite to the first electrode, and press the first electrode in a direction toward the heating element to apply electricity.

The temperature of the component is detected by the temperature detection means, and when the temperature reaches a predetermined temperature range, the calorific value of the heating element is controlled by the calorific value control means to maintain the temperature of the component within the temperature range for a predetermined time. It is characterized by:

In addition, the present invention provides a brazing device including an electrode that presses a component to be brazed from a first direction, an electrode that holds the component from a direction opposite to the first direction, and a surface that faces the component. a second electrode provided with a heating element; a temperature detection means for detecting the temperature of the component; and a heat generation amount control means configured to control the amount of heat generated by the heating element based on the output of the temperature detection means. It is characterized by comprising the following.

The temperature sensing means may be an infrared temperature measuring device. The component may be sandwiched between the first electrode and the heating element with a tape-shaped silver solder interposed between the joint surfaces to be brazed.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

FIG. 1 is a block diagram showing the configuration of a brazing device in one embodiment of the present invention. Parts 8 and l to be brazed
The upper electrode 2 is the first ilF electrode that presses downward from the edge with O in the ml direction, and the lower electrode 1 is the @2 electrode with the heating element 6 provided on the surface facing the part 10.
[The pole 4 is connected to a welding power source 16 that supplies a welding current, and the welding power source 16 is connected to a phase shift control device 1 which is a heat generation control means.
4 to a power source 40. The infrared temperature measuring device serving as a temperature detection means includes: a detection section 12α that detects the temperature of the brazed portion of the component 8 and the component 10;

It is composed of an output section 12b and K that generate an output based on the temperature detected by the detection section 12α, and the output of the output section 12b is supplied to a phase shift control device 1t14, and the 1-phase control device 14 generates an output based on the output of the output section 12A. The welding power supply 16 is configured to control the power supplied to the welding power source 16 to control the amount of heat generated by the heating element.

Details of this embodiment are shown in FIGS. 2 to 4.

The component 10 is corrected to a predetermined posture by a mavupulator (not shown), and is fed to a predetermined position on the heating element 6 from the direction of arrow Q. As shown in FIG. 4, the heating element 6 is formed so that its upper surface matches the shape of the lower surface of the component 8, and holds one component 8 from below. The tape-shaped silver solder 20 is wound into a coil and is attached to a silver solder uncoiler (not shown).
It is fed onto the component 10 by a predetermined length from the direction of arrow P via the roller 24. When the silver solder is fed, flux is supplied onto the silver solder 20 from the flux supply pipe 22. Next, the component 8 gripped by the fingers 30α of the pine vinylator 30 is fed from the direction of arrow R onto the silver solder fed to the component 8, and is held in a predetermined position by the pine vinylator 30 until the brazing is completed.

Next, the upper electrode 2 is lowered in the direction shown by the arrow Z, and the part lO
At the same time, the lower electrode 4 and the heating element 6 hold the part 10 from below so that the part 10 does not move against the pressing force of the upper electrode 2. In this state, electricity is applied between the upper electrode 2 and the lower electrode 4.
Brazing is performed by increasing the temperature of the heating element 6. Silver wax 20
In order to feed the silver solder, the silver solder is sandwiched between the parts 8 and 10, and the silver solder is pressed by the upper electrode 2, and then a tension is applied in the opposite direction to the silver solder feeding direction. If the silver solder is used, it will be cut by the tension when the silver solder melts, so there is no need to provide a cutting means for the silver solder. The infrared temperature measuring device 1112, which is a temperature detecting means, has a detecting section 12.
α is disposed toward the joint between component 8 and component 10, and measures the temperature of the joint without contact. Infrared temperature measuring device 1
The second output section 12b controls the ignition timing of the phase shift control device 14 based on the output of the detection section 12α. That is, when the temperature of the junction is lower than the set temperature TO within the predetermined temperature range TI, T2, the temperature increase rate is maximized, and as it approaches the set temperature TO, the temperature increase rate becomes smaller. When the temperature To is reached, the phase shift control device 14 is controlled so that the temperature increase rate becomes O. Thereby, as shown in FIG. 5, the set temperature TO is maintained for a predetermined period t1-. -It can be stably supplied during t2. Note that an allowable range may be provided for the set temperature TO, and the joint temperature may be controlled to be within that range. When the brazing is completed, the upper electrode 2 is raised, and the brazed part 8 of the part 10 is fed to the next process from above the heating element 6 by the pine vinylator 30. In this embodiment, the above steps are controlled and automated by a microcomputer (not shown), so there is no need for one worker to be near the brazing equipment, so the worker does not have to inhale 7 lavux of steam.

According to this embodiment, since the silver solder is interposed over the entire joint surface of the parts 8 and 10, the parts 8 and 10 can be firmly joined, and the parts 8 and 10 can be firmly joined together. 8 to the component 10 (if used, the current flows across the entire joint surface between the component 8 and the component 10, so the electrical resistance can be small and the component 10
heat generation can be effectively transmitted to the component 8, and the temperature rise of one component 10 can be suppressed to a low level. Furthermore, according to this embodiment, since the temperature of the joint can be measured without contact, there is no error in the measured value due to the contact state of the sensor with the joint.

〔Effect of the invention〕

According to the present invention, it is possible to stably control the temperature of the joint of parts to be brazed, and to perform brazing reliably, thereby providing a brazing method and an apparatus therefor.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of a brazing apparatus in an embodiment of the present invention, and FIG. 2 is a perspective view showing parts to be brazed and a state in which silver solder is fed. FIG. 3 is a perspective view showing a state in which parts to be brazed are set on a heating element, and FIG. 4 is a side view showing a state in which the parts are sandwiched between an upper electrode and a heating element during brazing. FIG. 5 is a characteristic diagram showing changes in junction temperature over time in this example. FIG. 6 is a block diagram showing the configuration of a conventional manual brazing device, and FIG. 7 is a characteristic diagram showing changes in joint temperature over time during manual brazing. FIG. 8 is a block diagram showing the configuration of a brazing device studied in the process leading to the present invention, and FIG. 9 is a characteristic diagram showing changes in heating element temperature over time in the brazing device of FIG. 2...Electrode 1, 4...Second electrode. 6... Heating element, R, 10... Parts. 12... Warm detection means, 14... Heat generation--control means. 20...Silver wax.

Claims (1)

[Claims] 1. A part to be brazed is held between a first electrode and a heating element provided opposite to the first electrode, and the first electrode is connected to the heating element. The temperature of the component is detected by the temperature detection means, and when a predetermined temperature range is reached, the heat generation amount of the heating element is controlled by the heat generation amount control means to adjust the temperature of the component. A brazing method characterized by maintaining the temperature within the above temperature range for a predetermined period of time. 2. A first electrode that presses the component to be brazed from a first direction, and a second electrode that holds the component from a direction opposite to the first direction and has a heating element on the surface facing the component. 2
an electrode, a temperature detection means for detecting the temperature of the component,
A brazing apparatus comprising: a calorific value control means configured to control the calorific value of the heating element based on the output of the temperature detecting means. 3. The brazing apparatus according to claim 2, wherein the temperature detecting means is an infrared temperature measuring device. 4. The second aspect of the present invention is characterized in that the parts are sandwiched between the first electrode and the heating element via a tape-shaped silver solder on their joint surfaces to be brazed.
Brazing equipment as described in section.