JPH0228039Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an apparatus for externally shaping a synthetic resin tube extruded using an extrusion mold into a regular tube shape.

(Prior art) As devices for shaping the tube shape of extrusion-molded synthetic resin tubes, there are two types of devices: one that shapes the shape from the outside (external sizing) and the other that shapes the shape from the inside (internal sizing). .

A conventional external shaping apparatus is constructed as shown in FIG. Reference numeral 1 in the figure indicates a shaping device main body, and this main body 1 is arranged close to an extrusion port 21 of an extrusion mold 20. The main body 1 has a double cylinder structure with an outer cylinder 2 and an inner cylinder 3, and an internal gap 4 accommodates a vacuum tube (not shown) in a spiral shape, and allows cooling water to be circulated. There is. Annular suction ports 6 are formed at multiple locations on the inner cylinder 3. The suction port 6 communicates with the vacuum tube through a hole (not shown). The inner circumferential surface of the inner cylinder 3 is tapered so that the diameter becomes smaller toward the opposite end of the extrusion mold 20. An annular oil plate 10 is installed at the end of the extrusion mold 20 of the main body 1. That is, an annular recess 7 is formed at the end of the main body 1 on the side of the extrusion die 20, and an annular protrusion 11 of the oil plate 10 is inserted and fixed into the recess 7.
A hole 12 is formed in the oil plate 10, and oil as a lubricant is supplied from the hole 12. Further, a taper 13 for guiding the tube body is formed on the inner circumferential surface of the oil plate 10. The oil plate 10 is an extrusion mold 2
It is arranged opposite to the extrusion port 21 of No. 0.

In the above configuration, the extrusion port 21 of the extrusion die 20
The synthetic resin tube body 30 extruded from the extruder is stretched at a speed equal to or slightly higher than the extrusion speed of the extrusion die 20 by a tensioning machine (not shown). The tube body 30 is first introduced into the oil plate 10. In the oil plate 10, oil is supplied from the holes 12 to the outer peripheral surface of the tube body. This oil is what plays the next role. That is, tube body 3
0 is introduced into the oil plate 10 in a high temperature state, but because of the high temperature, the surface resistance is large and it is not possible to smoothly insert the oil into the oil plate 10 and the inner circumferential surface of the main body. Therefore, with oil,
By reducing the contact resistance between the outer circumferential surface of the tube body 30 and the inner circumferential surfaces of the oil plate 10 and the main body 1, the tube body 3
This allows 0 to be inserted smoothly. The tube body 30 is
As the tube passes through the main body 1, it receives a suction action from the suction port 6, is attracted to the inner peripheral surface of the main body 1, and is shaped into a regular tube shape. Further, the tube body 30 is cooled by cooling water circulating within the internal gap 4 of the main body 1.

(Problems to be Solved by the Invention) However, the conventional shaping apparatus described above has the following drawbacks. That is, at the beginning of the shaping operation of the tube body 1, the oil plate 10 and the main body 1 are in a relatively low temperature state, so the tube body 30 is inserted smoothly, but when the shaping operation continues for a predetermined period of time, especially The contact resistance between the oil plate 10 and the pipe body 30 will increase. This increase in contact resistance occurs because the oil plate 10 becomes high in temperature due to the heat of the tube body 30, which cancels out the lubricating effect of the oil described above. As a result, the tube body 30 cannot be stretched stably, and the tube body 30 receives compressive stress due to the extrusion force from the extrusion die 20, causing annular irregularities in the tube body 30. This reduces the value of the product. Further, the oil may reach the suction port 6 as the tube body 30 moves, and the suction port 6 may become clogged with oil, making it impossible to perform the molding operation smoothly.

(Means for Solving the Problems) The purpose of the present invention is to eliminate the above-mentioned conventional drawbacks, and its gist is to convert synthetic resin pipes extruded using extrusion molds into regular pipes. In an apparatus for shaping into a shape, a cylindrical shaping apparatus main body is provided with a suction port on the inner circumferential surface side and a synthetic resin tube is passed through, and a main body is installed at the end of the extrusion mold side of this main body. The present invention relates to an apparatus for shaping an extruded synthetic resin tube body, characterized in that it is equipped with a cooling ring body having a tubular cooling water passage therein.

(Example) An example of the present invention will be described below with reference to FIG. In this embodiment, a cooling ring body 40 is used instead of the oil plate 10 in the conventional device shown in FIG.
is used. In this embodiment, the configuration except for the cooling ring body 40 is the same as that of the conventional device shown in FIG. 1, so the same reference numerals are given in the figure and detailed explanation thereof will be omitted. The cooling ring 40 is installed at the end of the main body 1 on the extrusion die 20 side. That is, the annular convex portion 41 of the cooling ring body 40 is inserted and fixed into the annular concave portion 7 formed at the end of the main body 1 on the extrusion die 20 side. The pipe body 30 is provided on the inner peripheral surface of the cooling ring body 40.
A taper 42 for guiding is formed.
An annular cooling water passage 43 is formed within the cooling ring body 40 . Further, screw holes 44 and 45 are formed at the upper and lower ends of the cooling ring body, a cooling water introduction pipe 46 is screwed into the screw hole 44 at the lower end, and the screw hole 45 at the upper end A cooling water outlet pipe 46 is screwed to. Each introduction pipe 46,
A tube (not shown) is connected to 47.

In the above configuration, the extrusion port 21 of the extrusion mold 20
The synthetic resin pipe body 30 extruded from the cooling ring body 40 is introduced into the cooling ring body 40, and further shaped into a regular shape by the main body 1. The cooling ring body 40 has a cooling water inlet pipe 4.
An annular cooling water passage 4 from 6 to an outlet pipe 47
3, so it is cooled. The tube body 30 is inserted into the cooling ring body 40 in a high temperature state, but since the outer surface is cooled by the cooling ring body 40, the surface resistance is reduced, and the tube body 30 can be smoothly inserted into the cooling ring body 40 and the main body 1. It will be done. Even if the above-mentioned shaping operation is continued, the cooling ring body 40 is always kept in a low temperature state by the circulating cooling water, so the pipe body 3
Even if it receives zero heat, it does not become high temperature, and the tube body 30 is always inserted smoothly.

The tube body 30 into which the main body 1 has been inserted is further cooled and solidified by being sprayed with cooling water or immersed in a water tank (not shown).

Note that the present invention is not limited to the above-mentioned embodiments, and various embodiments are possible. For example, it may be configured as shown in FIG. In this embodiment, a main body 51 made of a single cylinder is installed in a water tank 60.
A large number of holes 52 are formed in the main body 51, and an annular suction port 53 is formed therein. Main body 5
An annular body 54 having a groove 54a is provided on the outer peripheral surface of the hole 5.
5. A vacuum tube (not shown) is connected to the ring body 54 via a communication tube 56. A guiding taper is formed on the inner circumferential surface of the end of the main body 51 on the extrusion die 20 side, and the entire inner circumferential surface is slightly tapered.

A cooling ring 70 is installed at the introduction side end of the main body 51 . The cooling ring 70 is fixed to the water tank 60 so as to close an opening 61 formed on the side of the water tank 60. The cooling ring body 70 is formed by connecting two plates 71 and 72, and has an annular cooling water passage 73 formed therein. A cooling water introduction pipe 74 is connected to the cooling ring body 70, and a tube 75 is connected to this cooling water introduction pipe 74. The cooling ring body 70 also includes a cooling water passage 73 and a water tank 60.
A discharge port 76 is formed to communicate with the. The discharge port 76 is located above the cooling water introduction pipe 74.

In the above configuration, the synthetic resin tube 30 molded by the extrusion die 20 is inserted into the end of the main body 51, and in the process of passing through the main body 51, the suction port 5
3 and is shaped into a regular tube shape, and is cooled by cooling water in the water tank 60 through the holes 52. In the cooling ring 70 , the cooling water from the tube 75 passes through the introduction pipe 74 , flows through the cooling water passage 73 , and is discharged from the discharge port 76 into the water tank 60 . For this reason, the extrusion mold 20 of the main body 51
The side end portions are always kept at a low temperature, so that the outer circumferential surface of the tube body 30, which is at a high temperature, can be cooled, and smooth shaping can always be performed.

The tube body 30 that has passed through the main body 51 is further transferred to the water tank 6.
It is completely cooled and solidified by the cooling water in the room.

In this case, since the main body 51 is made of a single cylinder and is installed inside the water tank 60, it is lightweight, easy to replace, and requires somewhat less space. Moreover, since the main body 51 is formed with a large number of holes 52 and an annular suction port 53, the cooling effect of the synthetic resin tube is increased.
The accuracy of the tube shape is further improved. Furthermore, since the inner peripheral surface of the main body 51 is tapered,
The sealing properties during vacuum cooling are improved, and a glossier synthetic resin tube body can be obtained.

(Effects of the invention) As explained above, the device of the present invention has the following effects:
Since the extruded synthetic resin tube is cooled at the end on the extrusion mold side, the surface resistance of the tube is lowered, allowing for smooth insertion and ensuring that it is shaped into a regular tube shape. be able to. In addition, since the cooling water passage is provided inside the cooling ring, the cooling water does not directly hit the outer circumferential surface of the synthetic resin tube immediately after extrusion, and instead It is possible to prevent the occurrence of annular irregularities caused by cooling water, and it is possible to obtain a synthetic resin pipe body with good appearance. Furthermore, there is no need to use oil as a lubricant, and there is no problem of oil clogging at the suction port, allowing for smooth extrusion molding.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional shaping device, FIG. 2 is a sectional view of a shaping device which is an embodiment of the present invention, and FIG. 3 is a sectional view showing another embodiment of the present invention. 1, 51: Main body, 6, 53: Suction port, 20: Extrusion mold, 21: Extrusion port, 30: Synthetic resin tube, 4
0, 70: Cooling ring body, 43, 73: Cooling water passage.

Claims (1)

[Scope of utility model registration request] In an apparatus for shaping a synthetic resin tube extruded by an extrusion mold into a regular tube shape, a cylindrical shape is provided with a suction port on the inner circumference side and through which the synthetic resin tube passes. Formation of an extrusion-molded synthetic resin pipe body characterized by comprising a device main body and a cooling ring body installed at the end of the extrusion mold side of the main body and having a tubular cooling water passage inside. Device.