KR100661998B1 - Extending and extruding die for tube - Google Patents

Abstract

An extending and extruding die for a tube is provided to form a resin pipe having a uniform thickness by promptly and uniformly heating a formed object introduced into a die body through a guide die. An extending and extruding for a tube includes a cylindrical case member(200), a die body(300), a plurality of through-holes(311), and a guide die(360). The through-holes penetrate a partition plate formed at the tip end of the die body. The guide die is engaged with one end of the case member to guide the formed object to the die body. A movement passage is formed in the interior of the guide die. A hot wind introduction opening and a hot wind discharge opening are formed on the peripheral portion of one side of the case member so that the openings can be opposite to each other. A cooling fluid introduction opening and a cooling fluid discharge opening are formed on the peripheral portion of the other side of the case member so that the openings can be opposite to each other.

Description

Tube Stretch Extrusion Die {EXTENDING AND EXTRUDING DIE FOR TUBE}

1 is a schematic view of a conventional extrusion molding apparatus,

2 is a schematic view showing a state of use of the tube drawing extrusion die according to the present invention;

3 is a perspective view of a tube drawing extrusion die according to the present invention;

4 is a cross-sectional view showing one embodiment of a tube stretch extrusion die according to the present invention;

5 is a cross-sectional view showing a separated state of the case according to the present invention;

6 is a cross-sectional view showing a die main body according to the present invention;

7 is a cross-sectional view showing another embodiment of a tube stretch extrusion die according to the present invention;

8 is an exploded perspective view of the die body and the auxiliary die of FIG.

<Description of Symbols for Main Parts of Drawings>

100: extruding die 110: feed roller

111: tow roller 112: recovery roller

200: case member 210: first case

215: hot air inlet 216: hot air outlet

220: second case 230: third case

235: cooling fluid inlet 236: cooling fluid outlet

300: die body 310, 320, 330: diaphragm

311: through hole 340: first coupling jaw

350: auxiliary die 351: euro

352: protrusion 360: guide die

365: second coupling step H: movement path

P: Molding Q: Resin Tube

S: space S1: heating chamber

S2: air cooling chamber S3: cooling chamber

The present invention relates to a tube stretch extrusion die, and more particularly, to introduce and expand compressed air by rapidly introducing compressed air in a state in which the resin molded product is rapidly heated, and to sequentially cool it to extrude into a resin tube having a uniform thickness and surface. To a tube stretch extrusion die.

In general, in order to manufacture a resin tube for communication or power cable production, a molded product wound in the form of a flat ellipsoid is prepared on a supply roller of an extrusion molding device, and heated and softened by introducing a heated compressed steam or the like into the molded product, and a supply roller. It is made of a tubular resin tube while passing through the extrusion die, and the resin tube is forcibly wound on the recovery roller while applying a predetermined tension.

Referring to the conventional extrusion molding apparatus in more detail with reference to Figure 1, the extrusion molding apparatus is an extruder (1) for extruding a molding made of a synthetic resin, and the molding is introduced from the extruder (1) to the appearance of the resin tube And a cooler 20 which solidifies while cooling the resin tube discharged from the die 10.

The extruder 1 includes a hopper 2 into which a synthetic resin molding is introduced, a cylinder 3 for guiding the molding introduced by the hopper 2 to the inlet 12 of the die 10, and the cylinder. (3) The heat band 5 located outside and the screw 3 which conveys the molding melted by the said heat band 5 to the inlet 12 of the said die 10 are comprised.

The die 10 has an inlet 12 is formed so that the molding extruded from the extruder 10 on one side, the outlet for transporting the resin pipe to the cooler 20 on the other side of the inlet 12 14 are formed respectively.

The cooler 20 has a movement hole 22 formed therein to move the resin tube moved from the outlet 14 of the die, and cools the resin tube 25 outside the movement hole 22. The cooling apparatus which solidifies is provided.

On the other hand, the resin pipe 25 withdrawn from the cooler 20 is pulled by the pair of pull rollers 35 and wound around the recovery roller 40.

The extrusion molding device configured as described above is given the shape of a cable and passes through the moving hole 22 of the cooler 20, and is cooled by the cooler 20 and solidified in the form of a resin tube 25. It is discharged and is towed by the towing roller 35 is wound on the recovery roller 112.

However, the extrusion molding apparatus is a structure in which the synthetic resin molding is simply heated by using steam supplied into the heating cylinder 3 of the extruder 1, so that the length of the extruder 1 should be relatively long. Finally, the molded product could be softened, and thus, the time required for molding the resin tube 25 was inevitably increased, which caused a decrease in productivity.

In addition, since there is no separate heating medium in the die 10 for molding the molded product into the resin tube 25, the molded product is gradually cooled and molded, so that a partial shrinkage phenomenon occurs and thus the resin tube 25 having a uniform surface is formed. There was a difficulty in forming.

In particular, since the extruder 1 and the die 10 are separately provided, the configuration of the extrusion molding device is very complicated, and the inside of the die 10 has a phenomenon in which a molding is pressed by heat or foreign matter is attached. However, it may be molded into a good resin tube only by removing it or periodically repairing it, but there is a problem in that the repair work is very difficult as the die 10 is provided as an integrated type.

The present invention has been made to solve the above-mentioned problems, an object of the present invention is to form a resin tube by introducing compressed air into the molding in a state in which a flat oval shaped resin molding is heated quickly and uniformly, By sequentially cooling, the present invention provides a tube drawn extrusion die that can be molded into a high quality resin tube having a uniform surface and thickness.

Another object of the present invention is to improve the flow characteristics of the heating air for heating a resin molded product, to improve the heating efficiency of the molded product, and to shorten the time required for molding the resin tube.

Another object of the present invention is to provide a tube stretch extrusion die that can be easily repaired in case of damage to the component by providing a part of the extrusion die to be separated.

A configuration of the present invention for achieving the above object is an extrusion die for extruding a resin molded product in the form of a tubular tube, comprising: a case member of a cylindrical body through which the molded product is passed; A die body inserted into the case member so that a plurality of spaces are formed, and a diaphragm which is in close contact with the inner circumferential surface of the case member protrudes stepwise at a predetermined interval, and has a moving passage through which the molding passes; A plurality of through holes penetrating through the diaphragm formed at the tip of the die body of the diaphragm; It is coupled to the other end of the case member and the movement passage is formed therein to include a guide die for guiding the molded body to the die body, the hot air inlet and the hot air outlet is formed on one side peripheral portion of the case member, the other side The cooling fluid inlet and the cooling fluid outlet are formed on the periphery thereof so as to face each other.

In addition, the first coupling step is formed stepped in the end of the die body to be coupled to one end of the case member, the second coupling step is formed in the end of the guide die to be fitted to the other end of the case member stepped Characterized in that it is formed.

In addition, the auxiliary die is coupled to the diaphragm formed at the front end of the die body to form a predetermined space and the moving passage is formed therein, wherein the flow passage is in communication with the through hole.

In addition, the diaphragm formed at the front end of the die body is provided in a tubular shape with one side opened, characterized in that the protrusion is formed stepped on one side of the auxiliary die so as to be inserted into the opening.

In addition, the die body, the auxiliary die, the guide die is characterized in that provided with a stainless material.

The case member is characterized in that provided with a stainless material.

In addition, the end of the guide die adjacent to the die body is characterized in that formed inclined.

The case member may include: a first case in which the hot air inlet and the hot air outlet are formed at a periphery thereof; A second case coupled to the first case; It is characterized in that the third case is coupled to the second case and coupled to the second case formed in the peripheral portion of the cooling fluid inlet and the cooling fluid outlet.

In addition, the diaphragm is characterized in that it is in close contact with each of the coupling portion of the first, second, third case.

In addition, the first, second, and third case is characterized in that bonded by a heat resistant adhesive.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention in detail.

Figure 2 is a schematic diagram showing the use state of the tube drawing extrusion die according to the present invention, Figure 3 is a perspective view of the tube drawing extrusion die according to the present invention, Figure 4 is an embodiment of the tube drawing extrusion die according to the present invention 5 is a cross-sectional view illustrating a separated state of a case according to the present invention, and FIG. 6 is a cross-sectional view showing a die body according to the present invention.

As shown in the figure, the extrusion die (extruding die, 100) for forming a tube according to the present invention, the case member 200 through which the resin molding (P) is passed, and inserted into the case member 200 And a guide die 360 installed inside the case member 200 so as to be spaced apart from the die body 300 at a predetermined interval by the die body 300 for extruding the molding P into the tube.

Extrusion apparatus including the die main body 300 as one component, the feed roller 110, the molding (P) is wound in a flat oval shape, and the extrusion die 100 from the feed roller 110 ), The molded article P is passed through, and a pull roller 111 for pulling the resin pipe Q extruded by the extrusion die 100 to be wound onto the recovery roller 112.

Here, the first molded product (P) via the extrusion die 100 is maintained in the shape of a flat ellipse, and supplied with a predetermined amount of compressed air of 0.5 to 1 kg / cm ² through the open portion of the end After that, by pressing the tow roller 112 installed at the front end of the recovery roller 113 so that the compressed air is not lost, the compressed air passes through the die 100 by the pressing force of the tow roller 112. Is moved along the interior of the molding (P), whereby the molding (P) is continuously extruded from the flat ellipsoid into the resin tube (Q) having a tubular tube form and wound into the recovery roller (112). It is configured to be.

The case member 200 may be provided as an integral cylindrical body, and is preferably provided as a cylindrical body in which a plurality of cases are coupled to facilitate separation and coupling.

That is, the case member 200 may include a first case 210 formed with the hot air inlet 215 and the hot air discharge port 216 facing each other at a peripheral edge thereof, and a second fitting fitted with the first case 210. A case 220 and a second case 220 are fitted to each other, and the third case 230 includes a cooling fluid inlet 235 and a cooling fluid outlet 236 opposite to each other.

The hot air inlet 215 and the hot air outlet 216 of the first case 210 are respectively connected to a heating device (not shown) by piping so that the air heated to a predetermined temperature can be discharged, and the third case The cooling fluid inlet 235 and the cooling fluid outlet 236 of the 230 are connected to a cooling device (not shown) and pipes so that the cooling fluid cooled to a predetermined temperature can be supplied and discharged.

Here, the first, second, third case (210, 220, 230) can be interconnected by welding, but in the present invention, after bonding in a mutually interfitted manner for easy maintenance, excellent heat resistance and strong adhesive force (epoxy) It is preferable to bond closely using a structural adhesive such as).

More preferably, the structural adhesive is insoluble and can be used for a long time, but the adhesive used for the bonding portion of the first and second cases 210 and 220 that is affected by heated air is a structural adhesive that can withstand high temperatures well. As the adhesive used in the joint portions of the second and third cases 220 and 230 which are affected by the cooling fluid, a structural adhesive that is resistant to low temperatures is used.

The die body 300 has a circular diaphragm 310, 320, 330, which is in close contact with the inner circumferential surface of the case member 200, is formed to protrude stepwise at regular intervals, and the case member 200 is terminated at an end portion thereof. The first coupling step 340 is fitted to be fitted to one end of the step is formed, the inside of the molding (P) passes through the passage (H) is made of a hollow form formed in the longitudinal direction.

Here, the first coupling step 340 is coupled to one end of the case member 200, more specifically is coupled to the side of the third case 230, other portions except for the movement passage (H) It will be sealed.

In addition, the die body 300 is inserted into the case member 200, the diaphragm 310, 320, 330 is coupled to the first, second, third case (210, 220, 230) By being in close contact with each other, a plurality of spaces S are formed by the first, second and third cases 210, 220 and 230 and the diaphragms 310, 320 and 330.

The space S formed in the first, second, and third cases 210, 220, and 230 is divided into a heating chamber S1, an air cooling chamber S2, and a cooling chamber S3, respectively.

Meanwhile, a plurality of through holes 311 penetrating in the longitudinal direction are formed in the diaphragm 310 formed at the distal end of the die body 300 among the diaphragms 310, 320, and 330.

That is, the heating air flowing into the hot air inlet 215 through the through-hole 311 flows, thereby heating the outside of the die body 300 located in the heating chamber S1.

The guide die 360, the second coupling step (365) is formed stepped in the end portion to be fitted to the other end of the case member 200, the moving passage (H) is formed inside the molding ( Guide P) to the die body 300.

Here, the second coupling step 365 is coupled to the other end of the case member 300, more specifically, is coupled to the side of the first case 210 to the other portion except for the movement passage (H) It will be sealed.

The length of the first case 210 may be increased by the guide die 360, thereby sufficiently securing a space of the heating chamber S1, and thus heating air flowing into the hot air inlet 215. It is possible to effectively heat the molding (P).

In addition, the guide die 360 guides the molding P to be accurately moved to the die body 300, and at the same time, relatively reduces a space in which heating air can flow inside the first case 210. It is possible to accelerate the speed of the heating air flowing to the die body 300.

As a result, heated air flows quickly through the moving passage H and the through hole 311 to heat the inside and the outside of the die body 300 including the guide die 360 to form the molded product P. It can be heated effectively.

Here, the guide die 360 adjacent to the die body 300 so that heated air flows smoothly into the moving passage H and the through hole 311 of the die body 300 through the guide die 360. The end of is preferably formed to be inclined.

Another embodiment of a tube stretch extrusion die according to the present invention is shown in FIGS. 7 and 8. Here, the same reference numerals as in the above-described drawings indicate the same member performing the same function, the case member 200, the die main body 300, the guide die 360 are included in the same.

As shown in the figure, the auxiliary die 350 is coupled to form a flow path 351 of a predetermined space in the diaphragm 310 formed at the tip of the die body 300, the movement passage (H) formed therein ) Is further included.

Here, the diaphragm 310 formed at the tip of the die body 300 is provided in a tubular shape having one side opened, and the protrusion 352 is stepped on one side of the auxiliary die 350 so as to be inserted into the opening. Is formed.

In addition, the auxiliary die 350 is coupled to the diaphragm 310 formed at the front end of the die body 300 by a coupling means such as bolt connection, welding connection, and the flow path 351 is connected to the through hole 311. It is formed in communication.

Therefore, the heated air flowing into the hot air inlet 215 is supplied to the outside of the die body 300 through the movement passage H and the flow path 351 of the auxiliary die 350, and at the same time, the die By being supplied to the moving passage H of the main body 300, the die main body 300 located in the heating chamber S1 is simultaneously heated inside and outside.

That is, the auxiliary die 350 distributes the heating air to the inside and the outside of the die main body 300, and forms the flow path 351 which is a narrow space to accelerate the movement speed of the heating air. Will be performed at the same time.

On the other hand, the case member 200, the die body 300, the auxiliary die 350, the guide die 360 is provided with a stainless material having excellent thermal conductivity, it is preferable to improve the heating and cooling efficiency. .

In the present invention, a temperature sensor is installed in the heating chamber (S1) and the cooling chamber (S3), the hot air inlet 215 and the hot air outlet 216, the cooling fluid inlet ( 235 and the valve driving unit for opening and closing the cooling fluid discharge port 236, and a control unit for controlling the same may be further included, which will be omitted since it is a known technique.

The operation of the tube drawing extrusion die according to the present invention as described above will be described.

First, the resin molding P is supplied to the extrusion die 100 in a state in which it is wound on the feed roller 110 in the form of an ellipsoid having a flat cross section.

Then, after supplying compressed air of 0.5 to 1 kg / cm ² through the opening of the end portion of the molding (P) via the extrusion die 100, the molding (P) to recover the compressed air so as not to lose the compressed roller ( Tow while pressing by the tow roller 111 installed at the front end of the 112 is wound on the recovery roller (112).

Here, the first molding P passing through the extrusion die 100 in a state where compressed air is not supplied maintains a flat ellipsoid shape, and thus cuts it.

Thereafter, the compressed air is moved into the molding P via the die main body 100 by the pressing force of the pulling roller 112, whereby the molding P has a tubular tube shape in a flat ellipsoid. Extruded into a resin tube (Q), the resin tube (Q) is continuously wound on the recovery roller (112).

In more detail, the molding P is introduced through the moving passage H of the guide die 360 and continuously moved to the moving passage H of the die body 100 in the first case 210. It is softened by the heating air supplied from the warm air inlet 215.

At this time, the heated air introduced from the hot air inlet 211 is filled in the heating chamber (S1) through the flow path 351 formed in the diaphragm 310 of the tip of the die body 300, the die body 300 At the same time as being supplied to the outside of the), is supplied to the moving passage (H) of the die main body 300, the die body 300 located in the heating chamber (S1) is simultaneously heated inside and outside to form a flat ellipsoid The molded article P is effectively heated.

At the same time, compressed air is introduced into the molding P by the pressing force of the pull roller 111, and the molding P is rapidly expanded to be the same as the shape of the inner wall of the moving passage H to form a tube. After molding to the resin tube (Q) of the, it is moved to the die body 300 located in the air-cooling chamber (S2).

The air cooling chamber S2 is partitioned into a space enclosed by the heating chamber S1 and the diaphragm 310 to move the die main body 300 by the air remaining in the air cooling chamber S2. The resin pipe Q moved to the passage H is gradually cooled.

In addition, the resin pipe (Q) via the air cooling chamber (S2) is moved to the movement path (H) of the die body 300 located in the cooling chamber (S3).

At this time, the cooling die (S3) is supplied to the cooling fluid through the cooling fluid inlet 235 of the third case 330, the die body 300 is rapidly cooled, and thereby the die body 300 The resin pipe (Q) via the moving passage (H) is discharged to the outside of the third case (330) while being solidified in the form of a tubular tube.

The resin tube Q solidified in the form of a tube by the extrusion die 100 is wound by the recovery roller 112 while being pulled by the pulling roller 111.

The molding P is extruded into the resin tube Q through the extrusion die 100 while the series of processes are continuously performed, and the resin tube Q is formed by the pull roller 111. While the pressurized air is prevented from being leaked while the pressurized air is pressed, the compressed air is continuously moved toward the extrusion die 100, whereby the molding P of the flat ellipsoid is extruded into the resin tube Q in the form of a tube. .

The resin tube (Q) molded as described above is mainly used as a communication tube or power cable, a thin protective tube.

On the other hand, in the present invention by further coupling the auxiliary die 350 to the diaphragm 310 of the end of the die main body 300, the heated air flowing into the hot air inlet 215 (the moving passage of the auxiliary die 350) The die body located in the heating chamber S1 by being supplied to the outside of the die body 300 through the H) and the flow path 351 and simultaneously being supplied to the moving passage H of the die body 300. 300 can simultaneously heat the inside and the outside.

Therefore, the molding P can be softened in a relatively short time, and thus the molding P can be molded into the resin tube Q having a smooth and uniform surface by the compressed air.

In addition, the first, second and third cases constituting the case member 200 (210, 220, 230) are both detachably fitted and bonded by an adhesive, so that the die body 300 and the auxiliary die 350 Even if it is damaged, the first, second, third case (210, 220, 230) to remove the cable can be easily repaired.

As described above, the extrusion die for forming a pipe member of the present invention allows the heated air introduced from the outside to be quickly introduced into and out of the die main body 300 and the guide die 360 to uniformly form the molded product P. While heating and softening, as the auxiliary die 350 is further added, the heating efficiency can be further improved, and in particular, the temperature is suddenly changed by sequentially cooling the air cooling chamber S2 and the cooling chamber S3. This prevents the resin tube Q from shrinking or uneven surface, which will be referred to as an industrially useful invention.

As described above, according to the present invention, the molded product flowing into the die body can be heated quickly and uniformly through the guide die installed in the heating chamber of the extrusion die, so that the molded product is uniformly compressed by compressed air in a sufficiently soft state. There is an advantage that can be molded into a resin tube in the form of a tube having a thickness.

In addition, by sequentially cooling in the air-cooling chamber and the cooling chamber, it is possible to prevent the resin tube from shrinking or uneven surface due to quenching as in the prior art, thereby producing a high-quality resin tube having a uniform surface.

In addition, the heating air flowing in the heating chamber can be flowed quickly, and further provided with an auxiliary die for distributing the heating air in and out of the die body, it is possible to shorten the heating time of the molding, as well as heating There is an advantage to improve the efficiency.

In addition, since the plurality of cases constituting the case member are both detachably fitted and adhered by an adhesive, even if the die body and the auxiliary die are damaged, the case can be easily repaired to improve the reliability of the device. It has an effect.

Claims (11)

In the extrusion die for extrusion molding a resin molded product in the form of a tubular tube, A case member of the cylindrical body through which the molding is passed; A die body inserted into the case member so that a plurality of spaces are formed, and a diaphragm which is in close contact with the inner circumferential surface of the case member protrudes stepwise at a predetermined interval, and has a moving passage through which the molding passes; A plurality of through holes penetrating through the diaphragm formed at the tip of the die body of the diaphragm; Is coupled to the other end of the case member and the movement path is formed therein includes a guide die for guiding the molding to the die body, And a hot air inlet and a hot air outlet are formed at the periphery of one side of the case member, and the cooling fluid inlet and the cooling fluid outlet are opposite to the other periphery of the case member. The method of claim 1, The first coupling step is formed stepped to the end of the die body to be fitted to one end of the case member, the second coupling step is formed stepped to the end of the guide die to be fitted to the other end of the case member A tube drawing extrusion die, characterized in that. The method of claim 2, And an auxiliary die coupled to a diaphragm formed at the front end of the die body so as to form a flow path having a predetermined space therein and having the moving passage formed therein, wherein the flow path is in communication with the through hole. The method of claim 3, wherein The diaphragm formed at the front end of the die body is provided in a tubular shape, one side of which is opened, and one side of the auxiliary die so as to be inserted into the opening, the tube extending extrusion die, characterized in that the step is formed. The method according to claim 3 or 4, The die body, the auxiliary die, the guide die is a tube stretch extrusion die, characterized in that provided with a stainless material. The method according to any one of claims 1 to 4, The case member is a tube stretch extrusion die, characterized in that provided with a stainless material. The method according to any one of claims 1 to 4, And an end portion of the guide die adjacent to the die body is formed to be inclined. The case member according to any one of claims 1 to 4, A first case having the hot air inlet and the hot air outlet formed at a periphery thereof; A second case coupled to the first case; A tube extension extrusion die, wherein the third case is coupled to each other and is composed of a third case in which the cooling fluid inlet and the cooling fluid outlet are formed at the periphery. The method of claim 8, And said diaphragm is in close contact with each of said first, second and third casing coupling portions. The method of claim 8, And said first, second and third cases are joined by a heat resistant adhesive. The method of claim 1, And an auxiliary die coupled to a diaphragm formed at the front end of the die body so as to form a flow path of a predetermined space therein and having the moving passage formed therein, wherein the flow path is in communication with the through hole.

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