JP4754724B2 - Plastic pipe shaping device - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to an apparatus for shaping a resin pipe having a predetermined shape used in place of, for example, a metal pipe.
[0002]
[Prior art]
In general, for example, as a pipe for fuel supply, a metal pipe is used from the viewpoint of strength and safety, but in recent years, a strong resin has been developed, the weight of the product has been reduced, etc. For this purpose, attempts have been made to use resin pipes instead of metal pipes. In this case, it is necessary to shape the resin pipe into a predetermined shape by bending it according to the shape of the product storage place. As this shaping method, the resin pipe is heated to a predetermined temperature by heating means such as a heater, a dryer, or a burner. Actually, it is done by heating.
[0003]
[Problems to be solved by the invention]
However, in such a resin pipe shaping method, a heater, a dryer or a burner is used as a heating means, so that the cost for shaping increases, such as heating efficiency being inferior and heating work time being prolonged. In addition, it is difficult to produce uniform work, and uniform heating is difficult and high-precision shaping quality cannot be obtained, and it is difficult to stably obtain a shaped product that is well stored in the product storage location. There is a problem that deterioration is likely to be caused.
[0004]
The present invention has been made in view of such circumstances, and an object of the present invention is to form a resin pipe that can easily achieve stable shaping quality, reduce costs, and improve the working environment. Is to provide.
[0005]
[Means for Solving the Problems]
In order to achieve this object, the invention according to claim 1 of the present invention is a resin pipe shaping device for shaping a resin pipe into a predetermined shape by heating the resin pipe with a heating means, wherein the heating means has an air injection hole. A formed cylindrical metal member, a heating coil that induction-heats the cylindrical metal member when a high-frequency current is supplied from a transistor inverter, and a fan that supplies air into the cylindrical metal member, The cylindrical metal member is induction-heated, and the resin pipe is heated to a predetermined temperature by hot air injected from the air injection hole into the resin pipe by the rotation of the fan, and shaped into a predetermined shape. . In this case, as in the invention described in claim 2, the number and inner diameter of the air injection holes of the cylindrical metal member are different between a portion where the bending angle of the resin pipe is large and a portion where the bending is small. Is preferred.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows a block diagram of an embodiment of a shaping apparatus according to the present invention. In FIG. 1, the shaping device 1 supplies a high-frequency current to a metal pipe 2 as a heating member, a heating coil 3 disposed on the outer peripheral surface side of the base end portion 2 a of the metal pipe 2, and the heating coil 3. A transistor inverter 4, a fan 5 that is rotatably arranged by a motor 6 outside the base end portion 2 a of the metal pipe 2, a control device 7 that controls the motor 6 and the transistor inverter 4, and the like.
[0007]
The metal pipe 2 is formed of a pipe made of an appropriate material that generates heat when an eddy current is induced by a magnetic flux generated from the heating coil 3, and an air injection hole 8 is formed in an axial direction or a diameter in the tip 2b whose tip is closed. A predetermined number of rows or staggers are formed in the direction, and the tip 2b is inserted into the internal hole 9a of the resin pipe 9. The air injection holes 8 may be formed at the tip 2b of the metal pipe 2 equally and with the same inner diameter. For example, a large number of air injection holes 8 or air injection holes 8 with a large inner diameter are particularly formed in a portion where the bending angle is large. And the heating temperature of the part can be set to be higher than that of the other part (the part with less bending).
[0008]
The heating coil 3 is formed, for example, by winding a copper pipe so as to correspond to the outer shape of the metal pipe 2, and both ends thereof are electrically connected to the transistor inverter 4 via the water-cooled cable 10. At the same time, a cooling water supply device (not shown) attached to the inverter 4 is configured to circulate and supply the cooling water into the copper pipe via the water cooling cable 10. The shape of the heating coil 3 may be a circular coil format or a horseshoe format.
[0009]
The transistor inverter 4 to which the heating coil 3 is connected includes an inverter circuit (not shown) using a semiconductor switching element such as a MOSFET or IGBT, an output transformer (current transformer), and the like, and has a predetermined frequency of several KHz to several MHz. An output high-frequency current can be output to the heating coil 3 via the water-cooled cable 10.
[0010]
The fan 5 is for sending air into the metal pipe 2 from the opening of the base end 2 a of the metal pipe 2 by the rotation of the motor 6, and rotates at a predetermined number of revolutions based on a control signal from the control device 7. The rotational speed of the fan 5 does not adversely affect the heating performance of the base end portion 2a of the metal pipe 2 due to the blowing force, and the high-temperature air in the metal pipe 2 due to the heating of the metal pipe 2 can be blown to the distal end portion 2b side. Set to degree. The control device 7 is constituted by a microcomputer, a sequencer, or the like, and controls the transistor inverter 4 and the motor 6 according to a predetermined procedure.
[0011]
According to this shaping device 1, first, the tip 2b of the metal pipe 2 is inserted into the resin pipe 9 set at a predetermined position, and the outer peripheral surface of the metal pipe 2 and the inner peripheral surface of the resin pipe 9 are substantially constant. It supports with the support mechanism which is not illustrated so that it may have a clearance gap. At this time, if necessary, the end opening of the resin pipe 9 can be closed with the lid 18 to prevent leakage of hot air to the outside of the resin pipe 9. In this state, when the transistor inverter 4 is operated by the control signal of the control device 7, the motor 6 is operated simultaneously or after a predetermined time.
[0012]
By the operation of the transistor inverter 4, a high-frequency current is supplied to the heating coil 3, an eddy current is induced in the metal pipe 2 by the magnetic flux, and the base end portion 2a of the metal pipe 2 is induction-heated at a high speed to a predetermined temperature. Moreover, the high temperature air (warm air) in the base end part 2a of the metal pipe 2 is blown to the front end part 2b side by rotation of the fan 5, and is injected from the air injection hole 8 provided in the front end part 2b. By the warm air jetted from the air jet holes 8, the inner surface of the resin pipe 9 is heated to a predetermined temperature, and the resin pipe 9 is in a soft state that can be deformed.
[0013]
When the resin pipe 9 is heated and softened, the operation of the transistor inverter 4 and the motor 6 is stopped by the control signal of the control device 7, and the resin pipe 9 is removed from the tip 2 b of the metal pipe 2 (or the resin pipe 9). Pull the metal pipe 2 out of the pipe 9). Next, the resin pipe 9 in the heated state is put in the shaping molds 11a and 11b (see FIG. 2), clamped, and cooled, so that the resin pipe 9 corresponds to the shape of the shaping molds 11a and 11b. It is shaped into a predetermined shape, and this state is maintained and used as a product.
[0014]
The heating temperature of the resin pipe 9 is set to a high temperature when the bending is large, for example, according to the type of resin of the resin pipe 9 and the shape to be shaped, and is set to a low temperature when the bending is gentle. . In the above shaping method, each process can be performed manually, and it is of course possible to automate each process as appropriate or to automate all processes.
[0015]
As described above, according to the shaping device 1, the metal pipe 2 is fitted into the internal hole 9 a of the resin pipe 9, the base end portion 2 a of the metal pipe 2 is induction-heated, and the high-temperature air inside the base end portion 2 a is used. In order to heat from the inner surface side of the resin pipe 9 by blowing air in the direction of the tip 2b by the operation of the fan 5 and injecting it from the air injection hole 8, by setting the position of the air injection hole 8 to a predetermined value, The entire inner surface of the resin pipe 9 can be heated uniformly, and the resin pipe 9 can be easily shaped into a predetermined shape.
[0016]
Moreover, since the heating method uses hot air generated by induction heating of the metal pipe 2, compared to the conventional heating means, high-speed and uniform heating is possible, and the time required for the shaping work can be shortened. Costs related to work efficiency and shaping can be reduced, and the use of safe induction heating can reliably prevent deterioration of the work environment. Further, the shaping operation can be automated by the control of the control device 7, and the cost of the shaped resin pipe 9 can be further reduced.
[0017]
In particular, by appropriately setting the position and the inner diameter of the air injection hole 8 provided in the metal pipe 2, a heating state corresponding to the bending degree of the resin pipe 9 can be easily obtained, and the resin pipe 9 having various shapes can be obtained. Therefore, it can be applied to a fuel tank pipe or the like that is required to be reduced in weight and cost.
[0018]
In this embodiment, the heat of the base end 2a of the metal pipe 2 is transferred to the base end 2a side of the resin pipe 9 to promote the heating of the resin pipe 9. However, in the case where the entire resin pipe 9 is uniformly heated, a shield plate 12 is provided between the heating coil 3 and the resin pipe 9 as shown by a two-dot chain line in FIG. Can also be used.
[0019]
Moreover, in the above description, after the resin pipe 9 is heated, the resin pipe 9 is extracted from the metal pipe 2 and shaped by the separate shaping molds 11a and 11b. For example, as shown in FIG. While being set in one of the shaping molds 11a and 11b, the metal pipe 2 is inserted into the inner hole 9a of the resin pipe 9, and the mold moving device 13 lowers the other mold 11b and clamps the mold. Heating may be performed in the same manner as in the above embodiment. In this case, the metal pipe 2 is preferably flexible to some extent, and is suitably used when the bending of the resin pipe 9 is relatively small. Even if it does in this way, the effect similar to the said Example can be acquired.
[0020]
FIG. 3 is a block diagram showing a reference example of the shaping device according to the present invention. The shaping device 1 of this reference example is characterized in that a heating member 14 such as a rod or plate that can generate heat by induction heating is inserted into the inner hole 9 a of the resin pipe 9, and the heating coil 3 is placed outside the resin pipe 9. Is arranged. According to this reference example, when the magnetic flux is generated from the heating coil 3 by the operation of the transistor inverter 4, the heating member 14 in the resin pipe 9 is induction-heated, and the resin pipe 9 is heated at that temperature. .
[0021]
In the case of this reference example , a heating member moving device 15 for taking the heating member 14 in and out of the resin pipe 9 is provided. Also in this reference example , it is possible to obtain the same operation and effect as in the above embodiment. Similarly to FIG. 2, by giving the heating member 14 flexibility, the resin pipe 9 can be heated in a state of being set in the shaping molds 11a and 11b as shown in FIG. In this case, since the shaping molds 11a and 11b themselves are also heated by the heating coil 3, it is possible to simultaneously heat from the inner surface and the outer surface of the resin pipe 9, thereby obtaining the effects such as further increasing the heating efficiency and achieving uniform heating. be able to.
[0022]
The present invention is not limited to each of the above-described examples. For example , the main part or part of each example is appropriately combined, for example, the embodiment shown in FIG. 1 and the reference example shown in FIG. 3 are combined. You can also. In addition, as shown in FIG. 4, the heating coil 3 may be coated with an insulating resin 16, and the heating coil 3 may be moved by the heating coil moving device 17. Further, the metal pipe 2 and the heating member 14 are not limited to the structure of each example , and those having an appropriate material and shape that generate heat by induction heating can be used.
[0023]
【The invention's effect】
As described above in detail, according to the first or second aspect of the invention, the resin pipe is shaped into a predetermined shape by the heat of the cylindrical metal member that is induction-heated by the operation of the transistor inverter and the hot air from the fan. The resin pipe can be heated uniformly, stable shaping quality can be easily obtained, cost can be reduced, and induction heating can be used to prevent deterioration of the working environment. it can.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an embodiment of a plastic pipe shaping device according to the present invention. FIG. 2 is a block diagram showing a modification thereof. FIG. 3 is a reference example of a plastic pipe shaping device according to the present invention. Configuration diagram shown [FIG. 4] Configuration diagram showing the modification thereof [Explanation of symbols]
1 shaping device,
DESCRIPTION OF SYMBOLS 2 Metal pipe 2a Base end part 2b Tip part 3 Heating coil 4 Transistor inverter 5 Fan 6 Motor 7 Control apparatus 8 Air injection hole 9 Resin pipe 10 Water-cooled cable 11a, 11b Shaping type 14 Heating member

Claims (2)

In the resin pipe shaping device that shapes the resin pipe into a predetermined shape by heating with a heating means,
The heating means includes a cylindrical metal member in which an air injection hole is formed, a heating coil for inductively heating the cylindrical metal member when a high-frequency current is supplied from a transistor inverter, and air in the cylindrical metal member. And inductively heating the cylindrical metal member, and heating the resin pipe to a predetermined temperature by warm air jetted from the air injection hole into the resin pipe by the rotation of the fan. A plastic pipe shaping device characterized by shaping into a shape.   2. The plastic pipe shaping device according to claim 1, wherein the number and inner diameter of the air injection holes of the cylindrical metal member are different between a portion where the bending angle of the resin pipe is large and a portion where the bending is small.

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