KR100484617B1 - Extrusion die of extrusion molding machine and method for manufacturing extruded pipe - Google Patents

Abstract

An extrusion die for an extrusion molding machine and a manufacturing method of an extruded pipe are provided to prevent thickness of a cross-shaped reinforcing rod of the extruded pipe for manufacture of a spiral pipe from getting thinner toward the center, by arranging a central reinforcement extruded pipe in the inner center of a core. In an extrusion die for an extrusion molding machine, a core(130) is fitted and fixed to a cylindrical body(120) connected to a core cover(110) and a feed passage(140) through which formed resin supplied from a first extruder is fed is formed between the core cover and the body, and the core. A central reinforcement extruded pipe(150) connected to a second extruder is arranged in the center of the core. The core cover comprises a flange part combined to the body by a bolt(116); a taper part extended from the flange part; and a square extrusion part(113) extended from the end of the taper part in a straight line. If a square tube-shaped part of the core is arranged to a square extrusion hole formed in the square extrusion part, a gap(T1) is formed between the inner peripheral surface of the square extrusion part and the square tube-shaped part of the core.

Description

Extrusion die of extrusion molding machine and method for manufacturing extruded pipe

The present invention relates to an extrusion die for an extruder and a method for producing an extruded molded tube for extruding an extruded tube for manufacturing a spiral composite resin pipe for underground laying, and more specifically, a core reinforcement extruded tube is formed in an inner center of a core. It relates to a method for producing an extrusion die and an extrusion tube for an extruder disposed.

Korean Patent No. 0392235 (registered on July 9, 2003) of the present applicant introduces an "extruder nozzle device for underground laying synthetic resin pipe."

The extruder nozzle device of the underground construction synthetic resin pipe is installed on the extruder main body, and an extrusion path communicating with the extrusion flow path of the extruder main body is formed on the central axis thereof, and a plurality of extruded holes are radially branched in the tip direction of the extruder. In addition, a ring-shaped extrusion groove connected to the extrusion holes is formed at the front end thereof, a fluid chamber chamber is formed at the center of the tip end, and a plurality of fluid suction holes are provided in which external fluid flows from the fluid chamber chamber to the outer circumferential part thereof. Coacaba formed with an extrusion space in which the core is projected while maintaining a predetermined gap with the core member so that the resin flows while the nozzle base is bolted to the nozzle base, and the core is bolted to the core cover. It consists of an extrusion cover and the like provided with an extrusion hole to protrude with a predetermined gap.

However, when molding the extruded tube using the extruder nozzle device of the underground buried synthetic resin pipe configured as described above, as shown in Figure 1, the thickness of the cross-shaped reinforcement 11 of the extruded tube 10 is the center There is a drawback to thinner.

Accordingly, an object of the present invention is the extrusion reinforcing die for extruder and the use of the center reinforcement extruded tube is disposed at the inner center of the core, the thickness of the cross-shaped reinforcement of the extruded tube for manufacturing the spiral tube can be prevented from thinner toward the center It is to provide a method for producing an extruded tube.

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Preferred embodiments of the present invention for achieving the above object will be described in detail with reference to the drawings.

2 and 3, the extrusion die 100 for an extruder according to the present invention is the core 130 is fitted into the cylindrical body 120 connected to the core cover 110, the core cover 110 is fixed, Between the main body 120 and the core 130, a transfer passage 140 through which the molding resin supplied from the first extruder 170 (shown in the form of a box in FIG. 2) is formed, and the center of the core 130 is formed. The center reinforcement extruder 150 is connected to the second extruder 175 (shown in box form in FIG. 2).

Referring to Figure 4a, the manufacturing method of the extrusion tube 200 for manufacturing a spiral tube using the extrusion die 100 for an extrusion molding machine configured as described above is the first molding resin is extruded from the first extruder 170 To form a rectangular piping portion 210 by passing through the extrusion hole 140 of the extrusion die 100, and at the same time the second reinforcing material extruded from the second extruder 175, the center reinforcement extrusion pipe 150 By passing through to form the central reinforcement portion 230 of the extruded tube 200, in the state disposed in the center of the central reinforcement portion 230 and the piping portion 210, the central reinforcement portion 230 and the piping portion ( The center reinforcement part 230 and the piping part 210 are integrally formed by their own rows of 210. The piping part 210 has a reinforcing table 220 which is joined to the center reinforcement part 230 on an inner surface thereof. 130 may be formed by.

The central reinforcement part 230 may contain a colorant and be distinguished from a color of the piping part 210.

The spirally manufactured extruded tube 200 is, as shown in Figure 4b, is wound into a spiral, is made of a spiral tube 250, the extruded tube 200 itself of the spiral tube 200 It becomes a triple wall pipe forming a circumferential surface. Accordingly, in the spiral tube 200, reference numeral 251 of the extruded tube 200 forms an inner wall, reference numeral 253 forms a center wall, and reference numeral 255 forms an outer wall.

The spiral pipe 200 configured as described above is an extrusion process for extruding the extruded tube from the extrusion die for the extruder as described above, a sizing and cooling process, spirally wound the extruded tube to the winding machine as an adhesive resin. It is formed by the winding process to join and the cutting process which cuts a spiral tube to a suitable length.

Components of the extrusion die for an extruder according to the present invention configured as described above and the molding of the extrusion tube for manufacturing a spiral tube by each component of the extrusion die will be described in detail with reference to the drawings.

Referring to FIG. 3, the core cover 110 includes a flange portion 111 coupled by a main body 120 and a bolt 116, a taper portion 112 extending from the flange portion 111, and It is composed of a square extrusion portion 113 extending in a straight line at the end of the tapered portion (112).

In addition, as illustrated in FIG. 2, when the rectangular extrusion hole 114 formed in the square extrusion part 113 is formed, the square tube shape part 135 of the core 130 is disposed in the extrusion hole 114. A predetermined gap T1 is formed between the inner circumferential surface of the square extrusion portion 113 and the square tube shape portion 135 of the core 130.

The gap T1 corresponds to the thickness of the piping part 210 in the extruded pipe 200 of FIG. 4.

Referring to FIG. 2, the cylindrical body 120 has an inflow port 121 connected to the first extruder, a spiral fastening portion 122 is formed on an inner circumferential surface of a rear end thereof, and is next to the spiral fastening portion 122. A stopper protrusion 123 is formed to protrude inward, and the tip flange portion 124 (see FIG. 3) is connected to the core cover 110 by the connecting bolt 116.

The stopper protrusion 123 is in close contact with the core 130 to prevent the first molding resin supplied to the inlet port 121 from leaking backward.

2 and 5, the core 130 has a spiral fastening portion 132 is formed on the outer peripheral surface of the rear end of the cylindrical body 131, four square tube-shaped portion (extending from the front end of the body 131 ( 133 are spaced apart from each other to have a cross-shaped gap 134, the center reinforcement extruded pipe 150 is passed in the longitudinal direction to the center of the body 131, the central steel extruded pipe 150 is a cross-shaped gap ( A guide groove 135 is formed at an inner edge of the square tube 133 to be disposed at the center of the 134.

In addition, the core 130 has a cylindrical body 131 is connected to the air compressor (not shown) and the pipe (not shown) to discharge the air to the square hole 136 formed in the square tube shape portion 133. . The air serves to maintain the shape of the square hole formed in the extruded tube 200 that is extruded by the extrusion die as well as the effect of cooling the molding resin.

Referring to FIG. 6, the core 130 of another example has a spiral fastening portion 132 formed on an outer circumferential surface of the rear end of the cylindrical body 131, and four square tube-shaped portions 133 extending from the tip of the body 131; 133a, 133b, 133c, and 133d are spaced apart from each other to have a gap 134, and bosses 137a, 137b, 137c, which block the gap 134 of the square tube portions 133a, 133b, 133c, and 133d. 137d is formed integrally with the square tube shapes 133a, 133b, 133c, and 133d, respectively, and the bosses 137a, 137b, 137c, and 137d form a center reinforcement extrusion hole 139, and the center reinforcement extrusion. The hole 139 is connected with a pipe (not shown) connected to the second extruder 175.

As a result, the second molding resin extruded from the second extruder 175 is extruded through the center reinforcement extrusion hole 139.

Referring to FIG. 7, the center reinforcement extruded pipe 150 has a discharge end 151 tapered, in the second molding resin and the first extruder discharged from the second extruder through the central steel extruded pipe 150. The first molding resin discharged through the transfer passage 140 is guided to be well bonded to each other.

Referring to FIGS. 8 and 9, the center reinforcement extruded pipe 150 may have a cross section shown in FIG. 6 as well as a circular cross section shown in FIG. 8 and a rectangular cross section shown in FIG. 9. It is deformable into various polygons, and the discharge end 151 is tapered, and discharged through the transfer passage 140 from the second molding resin and the first extruder discharged through the central steel extrusion pipe 150 from the second extruder. The first molding resin to be bonded is induced to be well bonded to each other.

As a result, the cross-sectional shape of the central reinforcing portion 230 of the extruded pipe 200 may be formed in a circular, square or other polygonal shape as well as the cross shape shown in FIG. 2.

In addition, the center reinforcing material extruded pipe 150 is disposed so that the discharge end 151 is coincided with the end of the square tube-shaped portion 133 of the core 130 in Figure 2, as shown in Figures 10 and 11 The discharge end 151 is disposed to protrude more than the end of the square tube shape portion 133 of the core 130, or the discharge end 151 is disposed inward of the end of the square tube shape portion 133 of the core 130. Can be.

This is different from the material of the second molding resin extruded through the center reinforcement extrusion pipe 150 and the material of the first molding resin extruded through the conveying passage 140, or the second discharged from the central reinforcing material extrusion pipe 150 It changes according to the curing speed of molding resin.

That is, for example, when the first molding resin is PE (polyethylene), and the second molding resin is PP (polypropylene) or vice versa, the discharge end 151 of the center reinforcement extruded pipe 150 is The placement position can be changed.

In addition, calcium carbonate (CaCo3) is added to the second molding resin to increase the strength of the central reinforcement part 230 of the extruded molding pipe 200 during extrusion and obtain a cooling effect of rapidly cooling the central reinforcement part 230. In addition to the calcium carbonate (CaCo3), short fibers, long fibers, talc or fry ash may be added to the second molding resin as a strength reinforcing material for rapidly cooling the core reinforcement part 230 and reinforcing strength.

The extrusion die for an extruder according to the present invention configured as described above is assembled as follows.

Referring to FIG. 2, the spiral fastening portion 132 of the core 130 is a cylindrical body (1) until the spiral fastening portion 132 of the core 130 is stopped by the stopper protrusion 123 of the main body 120. 120 is fastened to the spiral fastening portion 122, the flange nut 160 is fastened to the spiral fastening portion 132 of the core 130 such that the flange nut 160 is in close contact with the main body 120, the core 130. The fastening of the spiral fastening portion 132 and the spiral fastening portion 122 of the main body 120 is prevented from loosening. In addition, the center reinforcement extruded pipe 150 is slid along the guide groove 135 formed in the square tube shape portion 133 of the core 130 to the center of the insertion gap 134 of the square tube shape portion 133. The center reinforcement extruder tube 150 connected to the second extruder (not shown) is inserted into the inner center of the body 131 of the core 130 so as to be disposed, and the front flange portion 124 of the main body 120 and Since the flange portion 116 of the core cover 110 is connected by the connecting bolt 116, the square tube-shaped portion 133 of the core 130 is covered by the core cover 110, the core cover 110 The square tube-shaped portion 133 of the core 130 is disposed with a predetermined gap T1 in the extrusion hole 114 formed in the square extrusion portion 113 of the ().

Extrusion die for an extruder according to the present invention configured as described above has the function as follows.

When the first molding resin is continuously injected from the first extruder 170 into the inlet port 121 of the body at a predetermined pressure, the first molding resin is transferred along the conveying passage 140 to the core cover 110. In the process of extruding through the extrusion hole 114 formed in the square extrusion portion 113, the portion that is extruded into the gap (T1) between the extrusion hole 114 and the square tube shape portion 133 of the extrusion tube 200 The first molding resin, which forms the piping portion 210 and is also supplied to the cross-shaped gap 134 between the square tube portions 133, is formed as an inner reinforcing rod 220 of the extruded tube 200. At the same time, the second molding resin supplied from the second extruder 175 to the center reinforcement extruder tube 150 forms the center reinforcement portion 230 of the extrusion tube 200, and the center reinforcement portion 230 is an internal reinforcement rod. The center reinforcing portion 230 and the internal reinforcing table 220 are integrated with each other by the heat of 220.

As described above, the present invention is a method of manufacturing an extrusion die and an extrusion tube for an extrusion molding machine by molding the piping and the central reinforcing part with each extruder, the disadvantage that the center reinforcement of the spirally manufactured extrusion tube becomes thinner toward the center Since the center reinforcement part is firm, the strength of the extruded tube can be greatly improved, and the strength and cooling effect can be increased by adding calcium carbonate to the second resin formed into the central part, which is extruded from the center reinforcement extruder pipe. By increasing the extrusion speed of the center reinforcing portion of the extruded tube, the overall productivity can be improved by improving the extrusion rate of the extruded tube for manufacturing a spiral tube according to the present invention, the effect of improving the shrinkage of the extruded tube There is.

1 is a perspective view showing a conventional extrusion tube

Figure 2 is a partially cut perspective view showing an extrusion die for an extruder according to the present invention

Figure 3 is an exploded perspective view showing an extrusion die for an extruder according to the present invention

Figure 4 is a perspective view showing an extruded tube for manufacturing a spiral tube is extruded by an extrusion die for an extruder according to the present invention.

FIG. 5 is an enlarged perspective view of a core of FIG. 3 and a detailed view of a portion thereof; FIG.

6 is a perspective view showing a core of another example and a detailed enlarged view of a part thereof;

FIG. 7 is a perspective view showing the center reinforcement extruded tube of FIG.

8 and 9 is a perspective view showing a center reinforcement extrusion tube of another example and a detailed cross-sectional view showing a portion cut away

10 and 11 are schematic views showing another example in which the discharge end of the core reinforcement extruder pipe is disposed in the core.

* Description of Signs of Main Parts of Drawings *

100: extrusion die 110 for extrusion molding machine: core cover

120: cylindrical body 130: core

150: center reinforcement extruded tube 200: spiral tube manufactured extruded tube

210: piping portion 220: reinforcement

230: center reinforcement

Claims (16)

The core 130 is inserted into and fixed to the cylindrical body 120 connected to the core cover 110, so that the molding resin supplied from the first extruder is transferred between the core cover 110 and the main body 120 and the core 130. An extrusion die for extruder, characterized in that the transfer passage 140 is formed, the center reinforcement extruder pipe 150 is connected to the second extruder at the center of the core (130). The method of claim 1, The core cover 110 includes a flange portion 111 coupled by the main body 120 and the bolt 116, a tapered portion 112 extending from the flange portion 111, and a tapered portion 112. It consists of a square extrusion portion 113 extending in a straight line at the end, A rectangular extrusion hole 114 formed in the square extrusion part 113 is formed, and when the square tube shape part 135 of the core 130 is disposed in the extrusion hole 114, the inner circumferential surface of the square extrusion part 113 is formed. Extrusion die for an extruder, characterized in that a predetermined gap (T1) is formed between the square tube-shaped portion 135 of the core (130). The method of claim 1, The cylindrical body 120 has an inlet port 121 connected to the first extruder, a spiral fastening portion 122 is formed on the inner circumferential surface of the rear end portion, and a stopper protruding inward after the spiral fastening portion 122. A protrusion 123 is formed, the extrusion flange for an extrusion molding machine, characterized in that the front flange portion 124 is connected to the core cover 110 by a connecting bolt 116. The method of claim 1, The core 130 has a spiral fastening portion 132 formed on the outer circumferential surface of the rear end of the cylindrical body 131, and four square tube-shaped portions 133 extending from the front end of the body 131 form a cross-shaped gap 134. Spaced apart from each other so as to have, the center reinforcement extruded tube 150 is passed in the longitudinal direction to the center of the body 131, the center steel extruded tube 150 is disposed in the center of the cross-shaped gap (134) Extrusion die for an extruder, characterized in that the guide groove 135 is formed on the inner edge of the tube-shaped portion (133). The method of claim 1, The core 130 has a spiral fastening portion 132 is formed on the outer peripheral surface of the rear end of the cylindrical body 131, four square tube-shaped portion (133; 133a, 133b, 133c, 133d) extending from the tip of the body 131 Are spaced apart from each other to have a gap 134, and bosses 137a, 137b, 137c, and 137d for blocking the gap 134 of the square tube portions 133a, 133b, 133c, and 133d are respectively square tube shaped portions. (133a, 133b, 133c, and 133d) integrally formed, and the bosses 137a, 137b, 137c, and 137d form a center reinforcement extrusion hole 139, and the center reinforcement extrusion hole 139 is formed as a second. Extrusion die for an extruder, characterized in that connected to the pipe (not shown) connected to the extruder (175). The method of claim 1, The extruder die for the extruder, characterized in that the center reinforcement extrusion pipe 150 is the discharge end 151 is tapered. The method of claim 1, The extruder die for the extruder, characterized in that the center reinforcement extrusion pipe 150 is a cross-sectional cross-section. The method of claim 1, The center reinforcement extrusion pipe 150 is an extrusion die for an extruder, characterized in that the circular or rectangular cross section, various polygonal cross section. The method of claim 1, The center reinforcement extrusion pipe 150 is an extrusion die for extrusion molding machine, characterized in that the discharge end 151 is arranged to match the end of the square tube-shaped portion 133 of the core 130. The method of claim 1, The center reinforcement extruded pipe 150 is disposed such that the discharge end 151 protrudes more than the end of the square tube shape portion 133 of the core 130, or is inside the end of the square tube shape portion 133 of the core 130. An extrusion die for an extruder, characterized in that it can be disposed in. The spiral fastening portion 132 of the core 130 is the spiral fastening portion of the cylindrical body 120 until the spiral fastening portion 132 of the core 130 is stopped by the stopper protrusion 123 of the main body 120. (122), the flange nut 160 is fastened to the spiral fastening portion 132 of the core 130, the flange nut 160 is in close contact with the main body 120, the center reinforcement extrusion pipe 150 is The body 131 of the core 130 is slid along the guide groove 135 formed in the square tube shape portion 133 of the core 130 to be disposed at the center of the spacing 134 of the square tube shape portion 133. The center reinforcement extruder tube 150 connected to the second extruder is inserted into the inner center of the main body, and the flange portion 116 of the core cover 110 and the flange portion 116 of the main body 120 are connected to the bolt 116. By being connected by), the square tube shape portion 133 of the core 130 is covered by the core cover 110, formed in the square extrusion portion 113 of the core cover 110. Of the core 130 to the output aperture 114, a rectangular tubular upper 133 is extrusion molding machine, it characterized in that the extrusion die is disposed with a predetermined gap (T1). delete delete delete delete The first molding resin extruded from the first extruder 170 passes through the extrusion hole 140 of the extrusion die 100 to form a rectangular piping 210, and at the same time is extruded from the second extruder 175. The second molding resin passes through the center reinforcement extrusion pipe 150 to form a center reinforcing portion 230 of the extruded molding pipe 200, and is disposed at the center of the center reinforcing portion 230 and the piping 210. The method of manufacturing an extruded tube, characterized in that the center reinforcing portion 230 and the piping portion 210 in the heat of the center reinforcing the center reinforcement portion 230 and the piping portion 210 formed in one piece.