JPH05318597A - Synthetic resin molded form of electromagnetic induction heating connection and manufacture thereof - Google Patents

Abstract

PURPOSE:To easily obtain a low-cost synthetic resin molded form having excellent connecting strength by engaging heaters with connected parts of a pair of synthetic resin molded forms, incorporating it in a receiving jig, setting it on a surface plate of a pressure press, then pressurizing it and simultaneously generating a high frequency magnetic flux. CONSTITUTION:Protruding strips 3a and grooves 4a are formed on opposed surfaces of connecting parts 3, 4 of pair of synthetic resin molded forms 1, 2 to be connected. After heaters 5 are engaged with the grooves 4a, the forms 1, 2 are vertically stacked, and contained in a receiving jig 7 in which heating coils 6 are placed on a periphery. After the jig 7 is set on a surface plate 8 of a pressure press, a press bed 9 is moved down from above to pressurize it, a high frequency current simultaneously flows from a high frequency oscillator 10 to the coils 6 to generate a high frequency magnetic flux. Thus, quantity of heat is directly generated in the heaters 5 to partly melt the parts 3, 4 of the forms 1, 2, pressure is applied to the melted resin parts to be adhesively molded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin molded product by electromagnetic induction heating bonding and a method for manufacturing the same.

[0002]

2. Description of the Related Art In the electromagnetic induction joining method, when a magnetic substance or a conductor is placed in a high frequency magnetic field, hysteresis loss and Joule heat due to eddy current are generated and heat is generated in an extremely short time.
Induction heating uses this heat generation to heat the metal, and high thermal efficiency is obtained. Conventionally, when high frequency is used to weld plastic molded products together, they are welded together by fitting them together, inserting a metal body such as wire into the joint, heating them, and applying pressure from the outside. is doing.

[0003]

Conventionally, a wire, a sheet metal or the like has been used in advance to form an annular joint, and then a fitting process is performed on the shape of the joint of the molded product. The fitting process requires skill, and the punching process requires a very high manufacturing cost including the mold.

[0004]

[Means for Solving the Problems] A joint projection and a joint recess which are fitted to each other are formed on the corresponding surfaces of the joint of the divided synthetic resin molded product and the joint of the divided synthetic resin molded product. A coil-shaped connecting wire with a required gap between the wires is fitted to the two, the two molded products are superposed, and the heating coil is placed in a receiving jig equipped around it, and the receiving jig is set on a pressure press surface plate. Then, the press bed is actuated to apply pressure, and at the same time, a high-frequency current of a high-frequency oscillator is passed through the heating coil to generate a high-frequency magnetic flux, thereby directly generating heat in the coil-shaped connecting wire, and Part of it is melted, pressure is applied to this melted resin part, the melted resin is invaded and filled in the gap between the coil-shaped connecting wires, and then solidified, and the divided synthetic resin molded products are integrally joined. And a synthetic resin molded product of electromagnetic induction heating bonding and its In the manufacturing method.

The coil-shaped connecting wire having the required distance between the above-mentioned wires is formed by press-fitting the connectors at both ends and elastically fastening the coil-shaped connecting wire by the spring pressure of the coil-like connecting wire itself to generate heat in the annularly connected wire. As a body,

Further, the outer diameter of one end of the coiled connecting wire is formed as a tapered end, and the other end is formed as a general cut-off opening end,
Then screw the tapered end into the general separation opening end.
It may be fitted and joined by using a coil-shaped connecting wire formed in an annular shape.

[0007]

Since the molded product and the manufacturing method of the present invention are as described above, the conventional products such as wire and sheet metal are
It is a coil-shaped connecting wire, and its length can be appropriately expanded or compressed, and can be appropriately adjusted according to the fitting groove.

Further, in the case where the both ends are connected by tightening with a connector, they are press-fitted by an automatic machine.
It can be manufactured extremely easily as compared with conventional welding.

Further, the conventional wire, sheet metal, etc., once welded, have a constant length and do not change. Therefore, even if the wire is too short or too long, one of the joining grooves will be formed. It has a drawback that it does not close easily, especially if it is bent many times, it may eventually become too long or too short, and it will not fit exactly into the joining groove. However, in this invention, since it is a coil-shaped connecting wire, its length can be adjusted by appropriately expanding or compressing.

Moreover, the resin melted by directly contacting the heating element, which is a coil-shaped connecting wire, and receiving heat, enters the clearance of the coil-shaped connecting wire and solidifies as a whole or as a whole, and is just a spiral sewing thread. As described above, since the stitching is performed inside, the joining strength of the joining portion is doubled and extremely strong joining can be performed.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings showing an embodiment. FIG. 1 is a schematic overall configuration of an electromagnetic induction heating joining system according to the present invention, in which a synthetic resin molded article 1 to be joined, At 2, the joints 3, 4
Forming a joining projection 3a and a joining groove 4a on the corresponding surface of
A heating element 5 is fitted in the groove 4a, both molded products 1 and 2 are vertically stacked, and the heating coil 6 is put in a receiving jig 7 provided around the heating coil 6, and the receiving jig 7 is pressed by a press platen. 8, the press bed 9 is lowered from above to apply pressure, and at the same time, a high frequency current of the high frequency oscillator 10 is passed through the heating coil 6 to generate a high frequency magnetic flux, thereby directly generating heat in the heating element 5. A part of the joint portions 3 and 4 of the molded products 1 and 2 is melted, and pressure is applied to the melted resin portion to perform adhesive molding.

The present invention resides in that the heating element 5 is provided in the groove 4a of the molded product 2 as a coil-shaped connecting wire 5a having a required gap between the wires as shown in FIG.

When the joint portion of the molded product is annular, the coil-shaped connecting wire 5a is fitted with the conductive metal connectors 11 at both ends as shown in FIG. 3, as shown in FIGS. Although not shown in the figure, after the metal body is elastically tightened and provided in an annular shape, it is fitted into an annular joint groove of the molded product and the divided molded product is bonded as described above.

The coil-shaped connecting wire 5a, like the coil-shaped metal body 5b shown in FIG. 6, is obtained by winding a wire having a required wire diameter around a coil having a required diameter to provide a coil spring material. The outer diameter of the tape is formed at the tapered end 5b1, the other end opposite to the required length is formed at a general cut-off opening end 5b2, and then the taper end 5b1 is screwed and fitted into the general cut-off opening end 5b2. As shown in FIG. 7, an annular coil-shaped connecting wire 5b may be formed.

Also in this case, as shown in FIG. 1, the coil-shaped connecting wire 5b is fitted into the joining groove 4a formed in the molded product 2. Then, the corresponding molded product 1 is placed on the upper side, and the joining projection 3a is fitted into the joining groove 4a of the molded product 2.

Then, when pressure is applied to the molded product from above and below and a high frequency is applied, the joining projection 3a of the molded product is pushed into the joining groove 4a of the molded product. At this time, since the annular coil-shaped connecting wire 5b generates heat, the wall portion and the bottom portion of the joining groove 4a and a part of the joining ridge 3a are melted. Therefore, this melted resin is allowed to enter the inside of the annular coil-shaped metal body 5b, the high frequency is cut off when the metal body is filled, the heat generation is stopped, and the whole of the molded product 1 and the molded product 2 is solidified together. .

[0017]

EFFECTS OF THE INVENTION Since the molded product and the manufacturing method of the present invention are as described above, what is conventionally a wire, a sheet metal or the like is changed to a coil-shaped connecting wire, and its length is appropriately set. It can be extended or compressed and can be properly adjusted to fit into the mating groove.

Further, as shown in the embodiment, for example, the connection at both ends is made by press fitting by an automatic machine in the case of tightening connection by a connector, so that it is extremely easy to manufacture as compared with conventional welding. Is something that can be done.

Further, in the conventional connection of the wire and the sheet metal to the annular shape, since the connection end is butt-welded, not only the manufacturing process becomes complicated, but also the welded portion spreads out in the form of a dumpling and spreads around the exterior. This makes it difficult to see, especially for joining transparent bodies, because the connecting lines are visible from the outside, reducing the commercial value.

Further, the conventional wire, sheet metal, etc., once welded, have a constant length and do not change. Therefore, even if the wire is too short or too long, one of the joining grooves will be formed. It has a drawback that it does not close easily, especially if it is bent many times, it may eventually become too long or too short, and it will not fit exactly into the joining groove. However, in this invention, since it is a coil-shaped connecting wire, its length can be adjusted by appropriately expanding or compressing.

Moreover, the resin which is in contact with the heating element which is the coil-shaped connecting wire and directly receives heat and melts enters the gap of the coil-shaped connecting wire and solidifies as a whole or as a whole, and is just a spiral sewing thread. As described above, since the stitching is performed inside, the joining strength of the joining portion is doubled and extremely strong joining can be performed.

Therefore, according to the present invention, the joining structure and manufacturing of the joining member having a strict molding joining condition such as a transparent body, and the decorative member or the ball which is sometimes subjected to a dropping action and which is particularly required to have strength. It is a valuable method.

[Brief description of drawings]

FIG. 1 is a schematic overall configuration explanatory diagram of an electromagnetic induction heating joining system in the present invention.

FIG. 2 is a perspective view showing a single coil-shaped connecting wire as a heating element in the present invention.

FIG. 3 is a perspective view of a single connector for providing a coiled connecting wire in an annular shape.

FIG. 4 is a perspective view showing a state where a coil-shaped connecting wire is provided in an annular shape by using the connector.

FIG. 5 is an enlarged cross-sectional explanatory view of a connection portion of the same.

FIG. 6 is a perspective view showing another example of the coiled connecting wire according to the present invention.

FIG. 7 is a perspective view showing a state in which the coiled connecting wire of FIG. 6 is provided in an annular shape.

FIG. 8 is an enlarged partial explanatory view showing a state of a joint portion of the split molded product before joining.

FIG. 9 is an enlarged cross-sectional explanatory view of a joint portion in which a molded product is joined by using the coil-shaped connecting wire of the present invention.

FIG. 10 is an enlarged vertical cross-sectional explanatory view of a joint portion in which molded products are joined together.

[Explanation of symbols]

 1 Synthetic resin molded product 2 Synthetic resin molded product 3 Joining part 3a Joining ridge 4 Joining part 4a Joining groove 5 Heating element 5a Coil-like connecting wire 5b Coil-like connecting wire 5b1 Tapered end 5b2 Opening end 6 Heating coil 7 Receiving Tool 8 Pressure press surface plate 9 Press bed 10 High frequency oscillator 11 Connector

Claims (6)

[Claims] 1. A joining projection and a joining recess which are fitted to each other are formed on the corresponding surfaces of the joining portion of the divided synthetic resin molded article and the joining portion of the divided synthetic resin molded article, and the line gap is formed in the depression. Fit a coil-shaped connecting wire that is separated by the required width, polymerize both molded products,
Put the heating coil in the receiving jig installed in the surrounding area, set the receiving jig on the pressure press surface plate, pressurize by operating the press bed, and at the same time, apply the high frequency current of the high frequency oscillator to the heating coil to generate high frequency. A magnetic flux is generated, which directly generates heat in the coil-shaped connecting wire, melts a part of the joint of the molded product, and applies pressure to this melted resin portion to create a gap between the wires of the coil-shaped connecting wire. A synthetic resin molded product for electromagnetic induction heating bonding, which is characterized in that a molten resin is infiltrated and filled into, and then solidified, and the divided synthetic resin molded products are integrally bonded. 2. A coil-shaped connecting wire in which the wires are separated from each other by a required width by press-fitting connectors at both ends thereof, and elastically tightened by the spring pressure of the coil-like connecting wire itself, and connected in an annular shape. The synthetic resin molded article for electromagnetic induction heating joining according to claim 1, wherein the synthetic resin molded article is fitted into a recess of the one molded article and joined as a heating element. 3. A wire having a required wire diameter is wound around a coil having a required diameter to provide a coiled connecting wire having a required length, and
The outer diameter of one end of the coiled connecting wire is formed into a tapered end, the opposite end is formed into a general cut open end, and then the tapered end is screwed and fitted into the general cut open end to form an annular shape. The synthetic resin molded article for electromagnetic induction heating joining according to claim 1, wherein the synthetic resin molded article is joined by using the coiled connecting wire. 4. A split synthetic resin molded product, wherein a joining projection and a joining recess are formed on the corresponding surfaces of both joining portions, and a coil-like connecting wire is installed in the depression so that the wires are separated from each other by a required width. Then, both molded products are polymerized and placed in a receiving jig around which a heating coil is installed, the receiving jig is set on a pressure press surface plate, and the press bed is lowered from above to apply pressure. A high-frequency current of the high-frequency oscillator is passed through the heating coil to generate a high-frequency magnetic flux, which directly generates heat in the heating element, melts part of the joint between the two molded products, and applies pressure to the melted resin part. In addition, the method for producing a synthetic resin molded product of electromagnetic induction heating bonding, characterized in that the coiled connecting wire is intruded into and filled in a gap between the lines and then solidified to integrally bond the divided synthetic resin molded product. .. 5. A coil-shaped connecting wire having a required gap between the wires is provided in the concave portion of the one molded product, and connectors are elastically fastened by spring pressure of its own to both ends of the connecting wire and connected in an annular shape. 5. The method for producing a synthetic resin molded article for electromagnetic induction heating joining according to claim 4, wherein 6. A wire having a required wire diameter is wound around a coil having a required diameter to provide a coil-shaped connecting wire having a required length, and
The outer diameter of one end of the coiled connecting wire is formed into a tapered end, the opposite end is formed into a general cut open end, and then the tapered end is screwed and fitted into the general cut open end to form an annular shape. The method for producing a synthetic resin molded article for electromagnetic induction heating joining according to claim 4 or claim 5, wherein the coiled connecting wire is used for joining.