JPS63427Y2 - - Google Patents

Description

[Detailed description of the invention] This invention provides thermoplastic molded products with
For example, the present invention relates to an embedded metal fitting welding device for fixing nuts, bolts, pins, and other metal fittings to a thermoplastic base material by thermal welding.

BACKGROUND ART Conventionally, as a method for firmly attaching metal fittings such as nuts and bolts to thermoplastic plastic products, the metal fittings are set in advance in a molding die during molding of the base material.

This method requires a lot of effort and time in the series of work steps of setting the metal fittings in the mold, pouring the plastic material, and removing it after solidifying.

In recent years, in order to eliminate the inefficiency of these conventional methods and the dangers in the work process,
The heat welding method for embedded metal fittings has been attracting attention. In this method, the embedded metal fitting is heated and thermally welded after molding the plastic material with a mold, and ultrasonic waves, high frequency waves, a heater, etc. are used as the welding means.

However, in many cases, a large number of screw parts are attached to the plastic bodies of electrical equipment, etc., and the mounting strength must be uniform and high, and in terms of cost, it is required to manufacture them at low cost. Therefore, the embedded metal fitting welding equipment is also inexpensive.
There is a need for something that can be quickly heat welded.

The present invention was developed in view of the above circumstances, and it is possible to
Metal fittings can be easily and firmly welded,
Another object of the present invention is to provide an apparatus for welding embedded metal fittings to a thermoplastic base material, which has good workability and is inexpensive.

An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, a welding terminal 4 that moves forward and backward in the direction of arrow a along with a slider 3 heat-welds an embedded fitting 5 to a thermoplastic base material 2 that is positioned and fixed to a receiver 1. A pair of bearings 7, 7 that pivotally support the receiving plate 1 and the slide shaft 6 of the slider 3 are erected on a base 8.

On the back surface of the slider 3, two slide shafts 6 facing in the front-rear direction are arranged in parallel, and a mechanical drive mechanism (not shown) moves the slider 3 parallel to the base 8.
moves forward and backward by a predetermined stroke. Therefore, in front of the slider 3,
A stopper 9 is fixed.

A first holder 10 is fixed to approximately the center of the front surface of the slider 3 by screws 11, 11, and a cylindrical portion 10a with a threaded groove cut on the outer periphery is provided protruding from the center of the front surface of the holder 10. The cylindrical part 10a
Inside, the shaft 12a of the second holder 12 is
It is fitted so that it can slide.

Reference numeral 13 denotes a guide formed on the back surface of the holder 10. The top portion 14a of the adjuster 14 is guided within this guide 13, so that the second holder 12 can move in the front-back direction by a predetermined distance. That is, the threaded portion 14b of the adjuster 14 is threaded with a female thread coaxially carved in the shaft 12a of the second holder 12, and further, this threaded portion 14b
Penetrating through a through hole 14c coaxially formed inside,
A bolt 15 is screwed onto the second holder 12.

A push screw adjustment nut 17 that comes into contact with one end of the coil spring 16 is screwed onto the outer periphery of the cylindrical portion 10a of the first holder 10, and when not crimped, the second holder 12 is always connected to the first It functions to urge the holder 10 to be positioned forward.

18 is the second holder 1 with the heat insulating plate 19 in between.
The welding punch fixed to 2 is fitted to the base of the heat exchanger tube 20 with a screw, and the positioning nut 21
I am trying to fix it with. A heating element such as an electric heater 22 is inserted into the heat exchanger tube 20 to heat the heat exchanger tube 20 and the welding terminal 4 attached to the tip thereof.

The temperature of the electric heater 22 can be adjusted by connecting a lead wire 22a led out from the rear end of the heat transfer tube 20 through the through hole 12b of the second holder 12 to a voltage regulator (not shown) such as a slider. As a result, the welding terminal 4 is maintained at a predetermined temperature.

The welded terminal 4 has a rear end portion screwed to the heat exchanger tube 20, and a front end portion forming a shaft rod 4a with a round tip. The shaft rod 4a is loosely fitted into the female threaded part of the embedded metal fitting 5, and when welding, the axis of the embedded metal fitting 5 is
The inner surface of the prepared hole 2a of the thermoplastic base material 2 can be heated via the embedded metal fitting 5 while being held in place.

The embedded metal fitting welding device configured in this way is
Welding can be performed by operating as follows.

When starting the welding work, first move the slider 3 forward, and with the front surface of the slider 3 in contact with the stopper 9, the upper end surface of the pilot hole 2a of the base material 2 and the implantation surface of the shaft rod 4a of the welding terminal 4 are aligned. Adjust so that

That is, the second holder 12 is roughly adjusted to the depth that the adjuster 14 is screwed into, the bolt 15 is tightened and locked, and the welding punch 18 is screwed into the heat exchanger tube 20. Make fine adjustments to the appropriate depth and lock with the nut 21.

The force applied forward by the second holder 12 by the coil screw 16 is adjusted using the nut 17 so that it is appropriate for the shape of the embedded fitting 5 and the pilot hole 2a.

Thereafter, the slider 3 is moved back to return to the state shown in the first figure, the electric heater 22 is energized, and the welding terminal 4 waits until it reaches a certain temperature.

The base material 2 is provided with appropriate mounting means (not shown) such as a positioning block on the receiver 1 so that the center of the welding pilot hole 2a of the embedded metal fitting 5 can be set at a position that coincides with the axis of the welding terminal 4. ).

After preparing for welding according to the above procedure, the slider 3 is advanced with respect to the thermoplastic base material 2 set in the receiver 1 with the embedded metal fitting 5 fitted in the prepared hole 2a.

While the slider 3 remains in contact with the stopper 9 for about 3 seconds, the welding terminal 4
The embedded metal fitting 5 is heated and pressed. That is, the coil screw 16 is compressed because the first holder 10 moves forward while the welding terminal 4 is in contact with the rear end surface of the embedded fitting 5, and at that time, the first holder 1
The adjuster 14, which is threadedly engaged with the shaft 12a of the second holder 12, retreats within the guide 13 of the second holder 12.

On the other hand, the heated embedded metal fitting 5 thereby heats the inner circumferential surface of the prepared hole 2a, and the surface begins to melt, and the embedded metal fitting 5 causes the coil spring 16 to
It moves forward and is embedded by the urging force of.

The adjuster 14, which was initially retracted, moves forward during that period, and when the embedding is completed, returns to the forward position shown in the figure, and almost simultaneously, the slider 3 is retracted.

In this way, during the few seconds that the embedded metal fitting 5 is welded to one thermoplastic base material 2, the next base material 2 is mounted on the receiving metal 1, and the embedded metal fitting 5 is fitted into the prepared hole 2a. As a result, received money 1 one after another
The thermoplastic base material 2 is set in a predetermined position.
Then, the embedded metal fitting 5 can be thermally welded by simply moving the slider 3 forward one after another.

In the welding device of the present invention configured and operated in this way, the primary pressure by the slider 3 and the secondary pressure by the biasing force of the coil spring 16 are simultaneously loaded on the embedded metal fitting 5. Since the welding work can be carried out smoothly by simply moving the slider 3 forward, the welding work can be carried out extremely efficiently.

Moreover, since the embedding metal fitting 5 can be embedded while the thermoplastic base material 2 is melted by the heated welding terminal 4, a product with uniform fixing strength and uniform quality can be obtained.

FIG. 3a shows a state in which the embedded metal fitting 5 is fitted into the thermoplastic base material 2, and an imaginary line 5a shows the embedded state.

As mentioned above, when the device of the present invention embeds the embedded metal fittings into the plastic molded product, it is welded in a process separate from the plastic molding operation, so that the plastic molding machine such as the injection molding machine Since repeated continuous molding work can be performed according to the molding capacity, and metal fitting welding work can be performed efficiently and semi-automatically, the labor and time involved can be significantly reduced compared to conventional methods.

In addition, since the base material is heated by heat conduction from the welding terminal, it is cheaper and simpler than conventional ultrasonic or high-frequency heat welding equipment, and has great economic merits.

The device of the present invention can not only embed the wedge-shaped embedding fitting 5 as shown in the above embodiment, but also the prepared hole 2a' of the base material 2' of the cylindrical embedding fitting 5' shown in FIG. 3b. You can also embed it into In that case, it is of course necessary to adjust the biasing force of the coil spring 16 with the nut 17 and to adjust the positioning of the welding terminal 4 in accordance with the depth of embedding in the prepared hole 2a'.

[Brief explanation of the drawing]

Fig. 1 is a side view showing an embodiment of the present invention, Fig. 2 is a cross-sectional view taken along the - line in Fig. 1, and Fig. 3a is an enlarged view showing the thermoplastic base material and the embedded metal fitting. FIG. 3b is a longitudinal side view showing different shapes of the thermoplastic matrix and the embedding fittings. 1... Receiver, 2... Thermoplastic base material, 2a...
Pilot hole, 3...Slider, 4...Welding terminal, 5...
...Embedded metal fitting, 6...Slide shaft, 7...Bearing,
8... Base, 9... Stopper, 10... First holder, 12... Second holder, 16... Coil spring, 17... Nut, 18... Welding punch, 19
...insulation plate, 20 ... heat exchanger tube, 21 ... positioning nut.

Claims (1)

[Claims for Utility Model Registration] A receiver for positioning and fixing a thermoplastic base material, a slider that moves forward and backward with respect to the receiver, a first holder fixed to the slider, and a first holder that is fixed to the slider. a second holder that is inserted into the holder and is slidable in the front-rear direction; and an elastic member that is interposed between the first and second holders to urge the second holder forward. and a welding terminal that extends in front of the second holder and is provided through a heat transfer body, and is used by a slider to heat-weld the embedded fitting into the pilot hole of the thermoplastic base material. moving the first holder forward and compressing the elastic member;
An apparatus for welding an embedded metal fitting into a thermoplastic base material, characterized in that the embedded metal fitting fitted with a welding terminal is heated and welded into a pilot hole of the thermoplastic base material by the biasing force of an elastic member. .