JPH0334836A - Secondary treatment of conduit pipe - Google Patents

Abstract

PURPOSE:To attempt to improve treatment efficiency by inserting and placing a conduit pipe in a heating oven so as not to be brought into contact with the inner wall face of the heating oven, blowing heated air heated by means of a heater in the heating oven by means of a blower, putting the conduit pipe in a mold after heating the conduct pipe and molding it under pressure. CONSTITUTION:A conduit pipe 1 is inserted in a heating oven 2 from an opening 21 and is placed approximately at the center of the inside of the heating oven 2 so as not to be brought into contact with the inner wall face of the heating oven 2. Heated air heated by means of a heater 31 is fed in the heating oven 2 from a feeding inlet 22 by means of a blower 32 and the conduit pipe 1 is heated by this hot air. The air in the heating oven 2 is discharged from an air outlet 23 to a return pipe 5 and after it is heated again by means of the heater 31, it is fed in the heating oven 2 from the feeding inlet 22. The heated conduit pipe 1 is taken out of the heating oven 2 and is put in a mold 6 and the conduit pipe 1 is molded by pressurizing a pressure on a top force 61 or a bottom force 62 of the mold 6. After molding, the conduit pipe 1 is cooled and both ends are properly cut. As no wrinkle and unevenness occur on the end part of the conduit pipe 1 based on a uniform heating, the amt. of waste of the ends can be reduced and it is possible to attempt to improve treatment efficiency.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a method for secondary processing a gutter.

(Prior Art) Generally, a gutter is formed linearly by extrusion molding, but depending on the application location, it is necessary to provide a curve or a burr in the gutter through secondary processing.

Conventionally, when secondary processing a gutter, the gutter is first inserted into a heating furnace, the machine is heated by a heater installed inside the heating furnace, and the heated gutter is transferred to the heating furnace. It was taken out from the inside, put into a mold, and molded by applying pressure to the mold.

(Problem to be solved by the invention) However, in such conventional secondary processing methods, the gutter was directly heated by the heater inside the heating furnace, resulting in heating on one side of the heater side, resulting in uneven heating. easy. The distortion caused by uneven heating becomes wrinkles and unevenness in the subsequent molding process, and appears concentrated at both ends of the gutter.

In other words, the end of the gutter that has wrinkles or irregularities must be cut off and discarded, but the amount of end discarded is approximately 10 to 15% of the total.
%. Therefore, what can actually be manufactured into a product is the remaining portion after cutting off the end of the gutter where the wrinkles and unevenness appear, resulting in poor manufacturing efficiency.

Therefore, the present invention focuses on the above-mentioned conventional problems and aims to provide a method for secondary processing of gutters with high production efficiency.
There is.

(Means for Solving the Problems) The present invention was made with the aim of solving the problems described in item 4'. In the KaT no J method, a gutter is inserted into the heating furnace so as not to touch the inner wall surface of the heating furnace, and heated air heated by a heater installed outside the heating furnace is passed through the gutter using a blower. After blowing air into the inside of the heating furnace and heating the gutter with the air, the heated gutter is
It is taken out from the Q furnace, placed in a molding pot 1, and molded by applying pressure to the mold 6.

(Function) In the gutter secondary addition Th method of the present invention, the gutter is inserted and installed inside the heating furnace so as not to touch the inner wall surface of the heating furnace. By spreading the heat all over the inside of the heating furnace, the gutter is heated evenly on both sides. Since distortion due to uneven heating of the gutter is eliminated, it is possible to prevent wrinkles and gates from forming at the end of the gutter during the next molding.

(Example) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

The secondary pressurization method of the gutter according to the embodiment will be explained based on FIGS. 1 to 3. In the embodiment, a secondary processing method for providing warps and bulges in a gutter will be described as an example.

First, the original fabric of the gutter 1 is cut into a predetermined length.

Note that it is desirable that the material of the original fabric has a low heat shrinkage rate.

Next, the cut original fabric of the gutter 1 is inserted and installed inside the heating furnace 2.

As shown in FIGS. 1 and 2, the heating furnace 2 used here has an inlet/outlet 21 formed on the side surface, an air blower 22 on the top surface, and an exhaust port 23 on the bottom surface. is formed. In addition, the front 6S air blower II 22 is provided at three locations.
22 are arranged at regular intervals in the depth 15 direction of the heating furnace 2.

Furthermore, inside the heating furnace 2, a pair of meshes 24, 24 are provided above and below the insertion/removal opening 21, and this mesh 24.
4. Gutter 1 is inserted and installed between 24.

Therefore, the gutter 1 is inserted into the heating furnace 2 from the inlet/outlet 1121, and is installed approximately in the center of the heating furnace 2 without touching the white wall surface of the heating force j2 at all.

Next, the gutter 1 placed in the heating furnace 2 is heated.

A hot air fan 3 equipped with a heater 31 and a blower 32 is installed outside the heating furnace 2. [-1
@! J@The warm population of machine 3 is heated by the heating power j via return pipe 5
It is opened to the exhaust air [ ] 23 of 2. Note that the blower 32 is provided closer to the exhaust gas F]23 of the heating furnace 2 than the heater 3I.

That is, the heated air heated by the heater 31 is sent to the blower 3.
2 into the heating furnace 2 from the air blower r122,
The hot air heats the -C gutter.

Therefore, in this addition, since the gutter 1 is inserted and installed inside the heating furnace 2 so as not to touch the inner wall surface of the heating furnace 2, the hot air sent from the air outlet 22 is 1
It spreads throughout the interior of the heating furnace 2 so as to surround the gutter 1, and both sides of the gutter 1 are heated quickly and uniformly. In this way, gutter 1
By uniformly heating both sides of the gutter 1, distortion due to uneven heating can be prevented.

The air inside the heating furnace 2 is then discharged from the exhaust port 23 to the return pipe 5.
After being heated again by the heater 31, the air is fed into the heating furnace 2 through the air outlet 22. In this way, the remaining heat after heating the air (Jōrin Sazekoto-C gutter 1) can be reused, so the gutter 1 can be heated efficiently.

The heating temperature of the gutter 1 is preferably about 100 to 130''C, and the heating time is preferably about 2 to 3 minutes.

Next, as shown in FIG. 3, the heated gutter 1 is taken out from the heating furnace 2 and put into a mold 6, and the gutter 1 is molded by pressing the upper g261 or the lower mold 62 of the mold 6 and applying pressure. do. At this time, since the gutter 1 is free from distortion due to external unevenness, the gutter 1 is formed without wrinkles or depressions -11 at the ends. In addition, the molding surface of the upper mold 61 forms the inner surface shape of a light gutter, and the molding surface of the do mold 62 forms the outer surface shape of the light gutter, so that the raw fabric of the straight gutter 1 is warped by this forming. It is molded into a light gutter with a shank.

In addition, the forming mold described in iii.6 has a length of 1 times or more of the original fabric, and is open at both ends. By doing so, even if the gutter 1 is expanded in the axial direction during molding, the end of the gutter 1 will not protrude from the end of the mold 6, and pressure can be applied uniformly over the length of the gutter 1.

Down again +1;l! The inner circumferential shape of 52 and the outer circumferential shape of the raw fabric of gutter 1 are almost the same shape, or the outer circumferential shape of the raw fabric of gutter l is molded! S! It is preferable that the inner peripheral shape of ff7+ be slightly smaller than that of ff7+. Doing so may cause wrinkles or 11
A beautiful gutter without 111F11 can be obtained.

Historically, tree A'1 may be used as the adult Jfg type 6,
Don't use a thermosetting resin mold or a mold with low thermal conductivity.

After forming, the gutter 1 is cooled and both ends are appropriately cut.

Note that the cooling may be water cooling or air cooling.

As explained above, in the gutter secondary processing method of this embodiment, it is possible to prevent wrinkled gate protrusions from forming at the end of the gutter 1 by uniform heating. The amount of waste can be reduced. As a result, it is possible to improve the processing efficiency.

Although the embodiments of the present invention have been described above in detail with reference to the drawings, the specific method is not limited to these embodiments, and even if there are changes within the scope of the present invention, they are included in the present invention. .

For example, in the example, the blower is used in the heating furnace rather than the heater.
Although the blower is provided on the air outlet side, the blower may be provided closer to the air outlet of the heating furnace than the heater, or may be provided inside the heating furnace.

(Effects of the Invention) As explained above, in the gutter secondary processing method of the present invention, it is possible to prevent wrinkles and unevenness from forming at the end of the gutter by uniform heating. - By reducing the amount of waste at the C1 end, it is possible to achieve the effect that it is possible to plan the direction of the angle.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view showing a kake furnace used in the secondary processing method of the embodiment of the present invention, Fig. 2 is a sectional view taken along line 11-II of Fig. 1, and Fig. 3 is a longitudinal cross-sectional view showing the furnace used in the secondary processing method of the embodiment of the present invention. It is a perspective view showing a mold. 1... Gutter 2... Heating furnace: 31... Heater 32... Feeding machine [3... - Molding mold

Claims (1)

[Claims] 1) Insert and install a gutter inside the heating furnace so as not to touch the inner wall surface of the heating furnace, and use a blower to blow the heated air heated by the heater installed outside the heating furnace into the inside of the heating furnace through the air outlet. After blowing air and heating the gutter with the hot air, the heated gutter is taken out of the heating furnace and placed in a mold.
A method for secondary processing of a gutter, characterized by forming the gutter by applying pressure to the mold.