JP2791271B2 - Indirect heating brazing method and apparatus using it - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire for connecting a communication cable, a control cable, an insulated wire or the like having an insulating coating without damaging the insulating coating which is relatively easily burnt at the end thereof. TECHNICAL FIELD The present invention relates to a brazing method for securely brazing a connector pin to a connector and an apparatus using the same.

[0002]

2. Description of the Related Art When wiring and connecting a communication cable or an insulated wire having an insulating coating, an organic material, which is relatively easily burnable, is often used as an insulator. Then, the insulating coating was often damaged. In the conventional method, for example, in the case of brazing (solder) connection between the core wire of the coaxial cable and the connector pin, each fitting portion is pre-soldered,
A heat source such as a soldering iron is applied to the connector pins, and the core wire is inserted to a predetermined position while heating. After confirming that the solder has sufficiently flowed and the connection has been made surely, the heat source is removed to stop heating and cool.

As described above, conventionally, the soldering iron is usually used for heating. However, in order to perform satisfactory brazing with respect to the adjustment of the iron tip temperature, the state of contact with the pins, the contact time, etc. Requires expert skill. In this case, there is a problem in that the insulation coating of the cable may be burned due to excessive heating, and conversely, the soldering failure may occur due to insufficient heating or movement of the pins during cooling.

[0004]

SUMMARY OF THE INVENTION According to the present invention, if the object of brazing is a metal member having a concave portion and a convex portion corresponding to each other, the operator does not have the above-mentioned problems. It is an object of the present invention to provide a brazing method and a device using the same so that good brazing results can always be obtained even if the brazing is not performed.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, according to the present invention, when a brazing target metal member having a convex portion and a concave portion is brazed by inserting a projection into the concave portion and fitting the same. After the appropriate amount of brazing material and flux were previously loaded in the recesses, the projections were inserted, and the brazing portions of these metal members, including the vicinity of these portions, were included and a heat transfer piece having an appropriate heat capacity was included. When heat is supplied and heat is supplied to the heat transfer piece, the supply of heat to the heat transfer piece is automatically stopped when the charge consisting of the brazing material and the flux is melted.

[0006]

In order to carry out the brazing by heating through the heat transfer piece, one of the metal members having a concave portion and a convex portion to be brazed to each other is held, and the amount of heat required to complete the brazing is transmitted. A heat transfer piece having a suitable heat capacity to perform
A mechanism in which the heat transfer piece is movable in the fitting direction of the concave portion and the convex portion to be brazed, and provided with a return spring for movement;
A mechanism for pressing and holding the other of the metal members to be brazed while pressing the fitting portion to the mating portion of the mating member and pressing the heat transfer piece into contact with the heat source until a thermal connection is established. Using the provided device, heat is supplied from the heat source via the heat transfer piece to heat the brazing portion, and when the brazing material and the flux previously loaded in the recess to be brazed are melted, the recess is formed by the return spring. When the molten solder flows on the mating surface by moving relative to the convex part and moving completely, the gap between the heat source and the heat transfer piece opens by the action of the return spring, The thermal connection is configured to be released. Even after the thermal connection between the heat source and the heat transfer piece is released, the heat accumulated in the heat transfer piece having an appropriate heat capacity continues to be supplied to the brazing portion, and the brazing portion is not quenched. The molten solder wets the brazing surface well and solidifies to complete the brazing operation between the metal members. As described above, according to the means of the present invention, skill is not required, and furthermore, occurrence of burning of the insulating coating and occurrence of poor brazing due to excessive or insufficient heating are avoided, and good brazing is easily performed. I can do it.

[0007]

FIG. 1 (a) is a front view of a soldering device for a core wire of a coaxial cable and a connector pin according to an embodiment of the present invention, and FIG. 1 (b) is a side view thereof. In FIG. 1, reference numeral 1 denotes a heat transfer piece having a pin holding portion hole 1a for holding a connector pin, which is one of the members to be brazed, and a heat source contact portion hole 1b. A heat insulating sleeve covered with the heat transfer piece guide 4;
It is supported by playing with. Reference numeral 3 denotes a return spring that regulates the movement of the heat transfer piece 1, and reference numeral 3a denotes a spring receiving pin that penetrates through the heat insulating sleeve 2 and is driven into and fixed to the heat transfer piece 1. 5 is a cable clamp, 5a is a tightening screw for inserting an appropriate amount of brazing material and flux into a concave portion of the connector pin which is inserted and held in the pin holding portion hole 1a of the heat transfer piece 1. The cable is passed through the cable clamp 5, the core end of the cable is pressed according to the concave portion of the connector pin, and the heat source contact hole 1 b of the heat transfer piece 1 is brought into close contact with the heat source piece 6. Is fixed to the cable clamp 5. 6a is a heat source piece 6
6b is an on / off switch of the heater 6a, 6c is a power cord, 7 is a hand grip, and 8 is a board for arranging each mechanism at an appropriate position and assembling them in the apparatus.

The operation of the above brazing apparatus will be described with reference to FIGS. In these figures, 9 is a connector pin, 9a is a gas vent hole provided in the connector pin 9, and 10 is an appropriate amount of brazing material and flux (a predetermined amount of grease-filled solder) loaded in the concave portion of the connector pin 9. , 11 are cables (coaxial cables) whose terminals have been machined to braze the connector pins 9,
Reference numeral 11a denotes a core wire of the cable, and 10a denotes a brazing material flowing to a brazing portion between the connector pin and the core wire. FIG. 2 shows a state in which the connector pins 9 are set on the heat transfer piece 1, the soldering material and the flux 10 are loaded into the recesses of the connector pins, and the core wires 11 a of the cables are fitted into the recesses of the connector pins.
Is pressed in the direction of the heat source piece 6, the heat source piece 6 and the heat source contact hole 1 b of the heat transfer piece 1 are brought into close contact with each other, the tightening screw 5 a of the clamp 5 is tightened, and the preparation state in which the cable is fixed is shown. In this state, turn on / off the heater (not shown).
When the off switch 6b is turned on and the heater 6a is energized, heating proceeds sequentially to the heat source piece 6 and the heat transfer piece 1, and the connector pin 9, the brazing material and the flux 10 inserted into the concave portion thereof, and the core wire 11a. Has reached the brazing temperature, the brazing material and the flux 10 have melted, the brazing material has flowed, and the action of the return spring 3 on the heat conducting piece guide 4 fixed to the substrate 8 causes the heat conducting piece 1 to As a result, the core wire 11a is inserted deeper into the concave portion of the connector pin 9 to be in a completely fitted state, while the heat transfer piece 1 moves to the right side in the drawing with respect to the heat source piece 6. The thermal connection between them is released. After that, the connector pin 9 and the core wire 11a are stored while the heat transfer to the core wire 11a is dissipated by the heat storage of the heat transfer piece 1.
The brazing material flows into the gap of the fitting part, and wets the surfaces of both members,
The brazing material is also spread around the gas vent holes 9a, and the brazing is completed. FIG. 3 shows a state where the brazing is completed.
It was confirmed that the brazing material had sufficiently absorbed the gas vent hole 9a, and after the brazing was solidified and the brazed portion was cooled, the tightening screw 5a of the cable clamp 5 was loosened and the connector pin 9 was brazed. The cable 11 may be taken out.

[0009]

As described above, according to the present invention, since an appropriate amount of brazing material is used, there is no excess of brazing material, and an appropriate heat capacity is provided between the heat source and the member to be heated. Since the heat transfer piece intervenes and the thermal connection between the heat source and the heat transfer piece is automatically released at the same time as the melting and flowing of the brazing material, excessive heating is avoided, and the heat storage of the heat transfer piece ensures that there is no insufficient heating. As the brazing progresses, the heat transfer piece and the cable clamp hold the brazing fitting in a pressed state even during cooling. for that reason,
No skill is required, and there are no defects such as burning of the cable insulation coating due to overheating, poor brazing due to insufficient heating, or misalignment of the fitting part before solidification of the brazing material during cooling, resulting in poor brazing. The effect that a proper brazing state can be easily realized is obtained.

[Brief description of the drawings]

FIG. 1 (a) is a front view of a brazing apparatus embodying the present invention, and FIG. 1 (b) is a side view thereof.

FIG. 2 is a view illustrating a state in which a brazing target member is mounted on the brazing apparatus of the present invention shown in FIG. 1 and preparation for brazing is completed.

FIG. 3 is a view illustrating a state in which a brazing target member is mounted on the brazing apparatus of the present invention shown in FIG. 1 and brazing is completed.

[Explanation of symbols]

1: heat transfer piece, 1a: connector pin holding hole, 1b
... Heat source contact hole, 2 ... Heat insulating sleeve, 3 ... Return spring, 3a ... Spring receiving pin, 4 ... Heat transfer piece guide, 5
... Cable clamp, 5a ... Tightening screw, 6 ... Heat source piece, 6a ... Heater, 6b ... Heater on / off switch, 6c ... Power cord, 7 ... Hand grip,
8 ... board, 9 ... connector pin, 9a ... vent hole, 10 ... brazing filler metal and flux, 10a ... flowing brazing filler metal, 11 ... cable, 11a ... core wire.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B23K 3/03 B23K 1/00 330 B23K 3/02 H01R 43/02

Claims (2)

(57) [Claims] 1. A method for brazing a metal member to be brazed having a concave portion and a convex portion by inserting and fitting a protrusion into the concave portion. The brazing portion of the metal member into which the portion is inserted, including the vicinity of the portion, is heated by supplying heat through a heat transfer piece having an appropriate heat capacity, and the charging material is composed of a brazing material and a flux. There is when melted, indirect heating brazing wherein the kite to automatically stop the supply of heat to the heat transfer piece. 2. An apparatus for brazing a metal member to be brazed having a concave portion and a convex portion by inserting and projecting a protrusion into the concave portion, wherein the concave portion is loaded with an appropriate amount of brazing material and flux in advance. After fitting and inserting the member having the convex part, of the two metal members, while applying a force in the direction in which the insertion amount is further increased in the easily movable direction, the other is fixed and held, and the vicinity of the brazing site Heat is supplied to the brazing site through a heat transfer piece having an appropriate heat capacity and a heat transfer surface that is in close contact with the outer surface of the member, and heat is applied. An indirect heating brazing apparatus characterized in that the supply of heat to the heat transfer piece is automatically stopped while the heating of the brazing part by the piece is continued.