KR101386091B1 - Extrusion mold and pipe - Google Patents

Abstract

The present invention relates to a pipe extrusion mold and, more specifically, to a pipe extrusion mold which forms a cooling ironing part with high surface roughness in the front of the extrusion mold and irons the inner wall of a pipe extruded, thereby increasing the roughness of the inner wall to have a smooth inner wall. The extrusion mold (100) consisting of an external mold (20) and an internal mold (10) comprises the cooling ironing part (30) having required surface roughness in the front end of a inner mold (10), forms a cooling line (50) for circulating refrigerants in the inner space of the cooling ironing part (30), stabilizes the inner wall of the pipe in order to have high roughness by ironing the inner wall with the surface of the cooling ironing part (30) while rapidly cooling the inner wall of the extruded and molded pipe.

Description

Pipe extrusion mold to increase the roughness of the inner wall of the pipe during extrusion and pipes manufactured using the same {Extrusion mold and pipe}

The present invention relates to a pipe extrusion mold, and more particularly to a pipe at the time of extrusion in which the inner wall surface is smoother, ie, the roughness is increased by ironing the inner wall surface of the extruded pipe by forming a cooling iron portion having a high surface roughness in front of the extrusion mold. The present invention relates to a pipe extrusion mold for increasing the roughness of an inner wall and a pipe manufactured using the same.

Generally, the die of a pipe extruder is configured with an extrusion mold to continuously form a pipe of a desired shape and size.

The extrusion mold is mainly composed of an outer mold and an inner mold, and a predetermined gap is formed between the outer mold and the inner mold according to the thickness of the pipe to be extruded. At this time, the space portion is formed to maintain the gap between the inner mold and the outer mold.

The space portion acts as an obstacle for forming the cross section of the pipe to extrude the molten resin, but because it is formed at the beginning of the extrusion mold, the molten resin passing through it is fused again like water and extruded in the form of a pipe.

In addition, when the pipe is extruded by an extrusion mold, a process for cooling stabilization is required to maintain a constant shape. At this time, the outside of the pipe is mainly cooled by water cooling and the inside is cooled by air cooling.

On the other hand, the pipe is to perform a function to transfer the liquid or gas therein, the transfer efficiency of the liquid or gas to be transferred is determined according to the inner wall surface roughness of the pipe.

In other words, when the inner wall surface roughness of the pipe is low, the flow efficiency of the fluid or gas is reduced by the inner wall of the pipe, and the transport efficiency decreases. When the inner wall surface roughness of the pipe is high, the resistance of the fluid or gas acts less. will be.

However, according to the conventional extrusion mold structure, the molten resin is cooled and stabilized by air cooling at the moment of being discharged between the gap between the outer mold and the inner mold of the extrusion mold, thereby increasing the cooling time. That is, as the inner wall surface of the pipe to be formed is left unstable, the deformation of the pipe wall is not effectively controlled. Therefore, the inner wall of the pipe is deformed large and small, there is a problem that the inner wall surface roughness of the pipe is lowered.

This causes the fluid or gas to be transferred to the inside of the pipe to reduce the transfer efficiency due to the resistance of the pipe wall, and in order to overcome this, the pressure required for the transfer of the fluid or gas is further increased, which requires a lot of energy. have.

The present invention has been made in order to solve the problems of the conventional extrusion mold as described above, the object of the pipe to be extrusion molded into an extrusion mold by forming a cooling iron for fast cooling and stabilizing the inner wall of the pipe at the tip of the pipe extrusion mold The inner wall surface to achieve a high level of roughness to provide a pipe extrusion mold that increases the roughness of the inner wall of the pipe during extrusion.

The present invention for achieving the above object, in the extrusion mold made of the outer mold and the inner mold, the cooling line having a cooling iron having a desired surface roughness at the tip of the inner mold, the cooling line circulating the refrigerant inside the iron It is characterized in that the inner wall surface of the pipe to be extruded to quickly cool and at the same time to be ironed and stabilized by the surface of the cooling iron portion to have an inner wall surface of the pipe with high roughness.

Extrusion mold of the present invention, the cooling iron is installed at the tip of the inner mold when the hot melt is continuously extruded to cool the inner wall surface of the pipe to be extruded relatively quickly and ironed to stabilize the inner wall surface of the pipe during the molding of the pipe There is an advantage that the roughness can be increased to a desired degree.

In addition, as the roughness of the inner wall surface of the pipe is increased, as the flow of fluid or gas transferred therein is smooth, energy loss can be reduced, and the internal pressure of the pipe can be reduced to improve the life of the pipe.

1 is a cross-sectional view showing the structure of an extrusion mold according to the prior art.
Figure 2 is a cross-sectional view showing the structure of an extrusion mold according to an embodiment of the present invention.
3 is a view showing the structure of the cooling iron according to another embodiment of the present invention.
Figure 4 is a front view showing an inner mold according to another embodiment of the present invention.
5 is a front view showing a first cooling iron according to another embodiment of the present invention.
6 is a front view showing a second cooling run according to another embodiment of the present invention.

Hereinafter, the structure of the pipe extrusion mold for increasing the roughness of the inner wall of the pipe during extrusion according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a cross-sectional view showing the structure of an extrusion mold according to an embodiment of the present invention, Figure 3 is a view showing the structure of the cooling iron according to another embodiment of the present invention, Figure 4 is another embodiment of the present invention 5 is a front view illustrating a first cooling iron unit according to another embodiment of the present invention, and FIG. 6 is a front view illustrating a second cooling run unit according to another embodiment of the present invention. .

Figure 2 is a cross-sectional view showing the structure of the extrusion mold according to the present invention, the extrusion mold 100 is installed in the pipe extrusion mold as shown is composed of an outer mold 20 and the inner mold (10). A plurality of spacers 30 are provided between the inner mold 10 and the outer mold 20 to maintain a constant gap.

Particularly importantly, the cooling iron portion 30 is further installed at the tip of the inner mold 10. The outer circumferential surface of the cooling iron portion 30 has roughness enough to have an inner wall roughness of the pipe to be extruded. Have

In addition, a cooling line 50 is configured inside the cooling iron part 30. The cooling line 50 is mainly a passage for circulating water or refrigerant, and is configured to quickly stabilize the inner wall surface of the pipe to be extruded. In order to supply the refrigerant smoothly, the cooling line 50 utilizes the interior of the spacer 30 for maintaining the clearance gap between the inner mold 10 and the outer mold 20 to enable the supply and circulation of the refrigerant. Can be.

The pipe extrusion mold of the present invention, which enables the inner wall of the high roughness pipe having such a structure, extrudes a molten resin between the outer mold 20 and the inner mold 10 to continuously cool the pipe through water or air while continuously molding the pipe. In addition, the inner wall of the pipe extruded by the cooling iron part 30 provided at the front end of the inner mold 10 is quickly cooled and stabilized. That is, the inner wall of the extruded pipe is cooled while being in contact with the surface of the cooling iron portion 30 is formed in the same roughness as the surface of the cooling iron portion 30 and at the same time rapidly stabilized to obtain a pipe having an inner wall surface of high roughness. Will be.

3 is a view showing the structure of the cooling iron according to another embodiment of the present invention.

Another embodiment of the present invention is configured to increase the roughness of the inner surface of the pipe by separately supplying the refrigerant at different temperatures to the cooling iron.

According to another embodiment of the present invention, as shown in FIG. 3, the cooling iron unit includes a first cooling iron unit 110, a second cooling iron unit 120, and a third cooling iron unit 130. It is configured to supply refrigerant of different temperatures to the 1,2,3 cooling iron parts (110, 120, 130).

As shown in FIG. 3, the protrusion 12 and the position fixing protrusion 13 protrude from the tip of the inner mold 10, and a fixing hole 11 is formed at the center of the position fixing protrusion 13. As described above, the first cooling line 15, the second cooling line 16, and the third cooling line 17 are formed in a radial shape with respect to the fixing hole 11.

Although the first cooling iron 110 is coupled to the front end of the inner mold 10 and is not shown in the drawing, the protrusion 12 of the inner mold 10 is formed at the rear end of the first cooling iron 110. A groove (unsigned) and a position fixing groove (unsigned) corresponding to the position fixing protrusion 13 are formed, and thus the protrusion 12 and the position fixing protrusion 13 of the inner mold 10 are formed in the groove and the position fixing groove. Inserted into position.

In addition, a cooling line 116 is formed in a screw shape in the interior of the first cooling iron part 110, and the inlet port 114 and the outlet port 115 of the cooling line 116 are formed in the first cooling line of the inner mold 10. 15) tightly connected.

In addition, the first cooling iron 110 is connected to the second cooling line 16 and the third cooling line 17 of the inner mold 10, respectively, which is fastened to the front end of the first cooling iron 110. Four pass lines 117 are provided to send the refrigerant to the second cooling iron 120.

As shown in FIG. 3, the second cooling iron part 120 is fastened to the distal end of the first cooling iron part 110, but is not illustrated in the drawing. However, the second cooling iron part 120 is provided at a rear end of the second cooling iron part 120. The grooves (unsigned) and the position fixing grooves (unsigned) corresponding to the protrusions 112 and the position fixing protrusions 113 of the cooling iron part are formed to form the first cooling iron parts 110 in the grooves and the position fixing grooves. The protrusion 112 and the position fixing protrusion 113 are inserted to fix the second cooling iron 120.

In addition, a cooling line 126 is formed in a screw shape inside the second cooling iron 120, and the inlet 124 and the outlet 125 of the cooling line 126 are formed at the distal end of the first cooling iron 110. It is connected to two of the four passlines 117 formed.

In addition, two pass lines are connected to two pass lines 117 of the first cooling unit 110 connected to the third cooling line 17 of the inner mold 10 in the second cooling unit 120. 127 is formed.

As shown in FIG. 3, the third cooling iron unit 130 is fastened to the distal end of the second cooling iron unit 120, but is not shown in the drawing, but the second cooling unit 130 is connected to the rear end of the third cooling unit 130. The protrusion 122 of the cooling iron part and the groove (unsigned) and the outer fixing groove (unsigned) corresponding to the position fixing protrusion 123 are formed so that the protrusion of the second cooling iron part 120 in the groove and the position fixing groove. The 122 and the position fixing protrusion 123 are inserted to fix the third cooling iron 130.

In addition, the cooling line 136 is formed in a screw shape in the interior of the third cooling iron 130, and the inlet 134 and the outlet 135 of the cooling line 136 are formed at the distal end of the second cooling iron 120. It is connected to the two pass lines 127 formed.

In addition, a fixing hole 131 is formed at the front end of the third cooling iron 130, and one side of the fixing rod 140 is each of the fixing holes 111, 121, 131 of the first, second, and third cooling irons 110, 120, and 130. Is inserted into the screw is screwed into the fixing hole 11 of the inner mold 10, the other end of the fixing rod 140 is screwed 141 is screwed to the pressing hole 141 is the inner mold (10), Compressing the first cooling iron unit 110, the second cooling iron unit 120, and the third cooling iron unit 130, respectively, to prevent the leakage of the refrigerant in advance.

Another embodiment of the present invention configured as described above is different from each of the first, second, third cooling iron parts 110, 120, 130 through the first, second, third cooling lines (15, 16, 17) of the inner mold (10) By supplying a refrigerant at a temperature, the first, second and third cooling iron parts 110, 120, and 130 may improve the roughness and smoothness of the inner surface of the pipe by extruding the inner surface of the pipe extruded at different temperatures.

That is, the first cooling iron unit 110, the second cooling iron unit 120, the third cooling iron unit 130 in order to sequentially cool the temperature of the inner surface of the pipe in the form of high temperature, medium temperature, low temperature in a sudden manner. It is also possible to prevent the occurrence of thermal stress on the inner surface of the pipe due to the heat change, and to further increase the smoothness and roughness.

The extrusion mold according to the present invention cools the inner wall surface of the pipe to be extruded relatively quickly and simultaneously irons and stabilizes the cooling iron installed at the tip of the inner mold at the instant of continuous extrusion of the hot melt resin, thereby stabilizing the inside of the pipe when forming the pipe. Not only has the advantage of increasing the wall roughness to a desired degree, but also as the inner wall surface of the pipe increases, the energy loss can be reduced as the flow of fluid or gas transferred therein becomes smooth. By reducing the internal pressure of the pipe has the advantage of improving the life of the pipe.

In the above, the pipe extrusion mold which raises the roughness of the pipe inner wall at the time of extrusion by this invention was demonstrated.

It will be understood by those skilled in the art that the technical features of the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.

Therefore, it should be understood that the above-described embodiments are to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than the foregoing description, Ranges and equivalents thereof are to be construed as being included within the scope of the present invention.

100: extrusion mold
110: first cooling iron
111: fixing hole
112: projection
113: position fixing protrusion
114: inlet
115: outlet
116: cooling line
117: Passline
120: second cooling iron
121: fixing hole
122: projection
123: position fixing protrusion
124: inlet
125: outlet
126: cooling line
127: Passline
130: third cooling iron
131: Fixing hole
132: projection
133: position fixing protrusion
134: inlet
135: outlet
136: cooling line
137: Passline
10: internal mold
11: Fixing hole
12: turning
13: position fixing protrusion
15: first cooling line
16: second cooling line
17: 3rd cooling line
20: external mold
30: spacer
40: cooling iron
50: cooling line

Claims (3)

In the extrusion mold 100 consisting of an outer mold 20 and the inner mold 10,
Comprising a cooling iron portion 30 having a surface roughness pre-designed at the front end of the inner mold 10, the iron portion 30 is connected to two to three in series, each of the refrigerant at different temperatures are circulated Composed of a cooling iron forming a cooling line,
By forming a cooling line 50 in which the refrigerant is circulated inside the cooling iron portion 30,
The pipe to increase the roughness of the inner wall of the pipe during extrusion, characterized in that the inner surface of the pipe having a high roughness by stabilizing by fast cooling the inner surface of the pipe to be extruded by the surface of the cooling iron (30) at the same time. Extrusion mold.
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