JPS5815911B2 - Heating molding method for molded joints - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a method of heat molding a mold connection.

FIG. 1 shows a cross-sectional view of an apparatus for carrying out a conventional heating molding method for a mold connection part, in which 1 is a mold connection part, and a mold heating pot with a built-in heater 4 for heating is located on the outer periphery of the connection part 1. 3 is provided.

There is a connection part 1 on the outer periphery of the connection part 1 in the mold heating pot 3.
A diaphragm 7 is arranged so as to cover the mold heating pot 3, and the diaphragm 7 is sealed by a gas seal part 5 at an external position at both ends of the mold heating pot 3 in the axial direction. Cv cable).

Reference numeral 6 denotes a gas tank for inert gas such as nitrogen gas, which stores pressurizing gas to be supplied between the diaphragm 7 and the mold heating pot 3, and supplies pressurized gas when heating and molding the connection part 1. It is supposed to be done.

In the above-mentioned conventional heat molding method for the connection part, the connection part 1 is pressurized and molded through an inert gas during the heat molding of the connection part 1 as described above, but after the heat molding, the connection part 1 is molded.
This had the disadvantage that it took a long time to cool down and the construction time was long.

There was still a need for a means to suppress deformation of the cable insulator at the end of the mold heating pot.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for heating and molding a mold connection part, which eliminates the above-mentioned drawbacks, allows the mold connection part to be efficiently cooled after being heated and pressurized, and shortens the construction time.

The heating molding method for a mold connection part of the present invention includes a mold heating pot having a built-in heater provided at the outer periphery of the connection, and a diaphragm disposed in the mold heating pot so as to cover the outer periphery of the connection part. When the mold heating pot is filled with an inert gas and the connection parts are pressurized through the diaphragm and heated and molded to integrate, the diaphragm is arranged longer than between the gas seal parts of the mold heating pot, and the connection Heat molding is performed by filling inert gas between the mold heating pot and the diaphragm and between the mold heating pot and the diaphragm, and increasing the gas pressure in the latter than the former. In this method, the connection part is cooled while at least an inert gas is passed between the connection part and the diaphragm.

Hereinafter, an embodiment of the heat molding method for a mold connection part of the present invention will be described with reference to FIG. 2, where the same parts as those used in the conventional heat molding method are denoted by the same reference numerals, and explanations of the same parts will be omitted.

The connection part 1 and the outer periphery of the CV cable 2 in a longer section than between the gas seal parts 5 and 5 of the mold heating pot 3 are made of Teflon (
A tape layer 10 such as DuPont (trade name) tape, polyethylene terephthalate tape, or cellophane tape is provided, and the outside of the tape layer 10 is covered with a diaphragm 7 made of rubber or plastic.

Tape layer 10 between diaphragm 7 and CV cable 2
The filled portion is communicated with a gas tank 6 containing an inert gas such as nitrogen gas, Freon gas, or sulfur hexafluoride gas through a gas distribution copper pipe 10, and the penetration portion of the gas distribution conduit 10 in the diaphragm 7 is sealed by a gas seal portion 8. Further, both ends of the diaphragm 70 are sealed by gas seal portions 11, respectively.

9 is a stop valve. In the case of a heating mold for the connecting part 1, the connecting part 1 is heated via the heater 4, and
An inert gas at a pressure of 0.5 to 2 to 9 cm2 is flowed between the diaphragm 7, the CV cable 2, and the connecting portion 1.

At the same time, the inside of the mold heating pot 3 is filled with an inert gas at a pressure higher than the pressure between the diaphragm 7 and the insulator of the connection part 1, which is 0.5 to 2 kg/cm2, and the pressure is maintained at a constant level. Pressure 1.

After the connection part 1 is heated and pressurized and the integrated molding is completed, an inert gas is supplied between the diaphragm 7 and the connection part 1 while filling the space between the mold heating pot 3 and the diaphragm 7 with inert gas at a constant pressure. It circulates and cools the connection part 1.

Therefore, the construction time for the molded connection portion can be shortened.

Moreover, most of the equipment used to implement the conventional gas pressurized molding method can be used as is, and the work is simple.

Furthermore, since the heating cable portion is held down using inert gas pressure, deformation of the cable insulator can be reduced by holding down the cable insulator.

Furthermore, crosslinking residue generated in the mold connection portion can be effectively removed by heating.

As described above, according to the method of heating and molding a mold connection part of the present invention, the mold connection part can be efficiently cooled after being heated and pressurized, shortening the construction time, and suppressing the cable insulator to reduce deformation. It is something that you have.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a part of a conventional apparatus for carrying out a heat molding method for a mold connection part, and FIG. 2 is a sectional view of a part of an apparatus for carrying out a heat molding method for a mold connection part of the present invention. 1... helmet connection part, 2... Cv cable, 3... mold heating pot, 4... heater, 5, 8, 11... gas seal part,
6...Gas tank, 7...Diaphragm.

Claims (1)

[Claims] 1. A mold heating pot provided at the outer periphery of the connection part, and a diaphragm disposed within the mold heating pot so as to cover the outer periphery of the connection part, the mold heating pot being filled with an inert gas, and the diaphragm In this method, the diaphragm is disposed longer than between the gas seal portions of the mold heating pot, and the diaphragm is placed longer than between the gas seal portion of the mold heating pot, and between the connection portion and the diaphragm and the mold heating pot. and the diaphragm, and heat molding is performed with the latter gas pressure higher than the former, and after the heat molding, at least the connection part and the diaphragm are filled with inert gas. A heating molding method for a mold connection part, characterized by cooling the connection part while circulating an inert gas.