CN115750932A - Composite plastic-coated steel pipe and production method thereof - Google Patents
Composite plastic-coated steel pipe and production method thereof Download PDFInfo
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- CN115750932A CN115750932A CN202211412157.6A CN202211412157A CN115750932A CN 115750932 A CN115750932 A CN 115750932A CN 202211412157 A CN202211412157 A CN 202211412157A CN 115750932 A CN115750932 A CN 115750932A
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Abstract
The invention discloses a composite plastic-coated steel pipe and a production method thereof, belonging to the field of composite plastic-coated steel pipes. A composite plastic-coated steel pipe is prepared by coating a PFA film on a steel pipe, and the coating process comprises the following steps: s1, plasticizing PFA particles to enable PFA plastic to be in a flowing state to obtain a product A; s2, adding the die into the curing channel for heating, extruding the product A into the die through a high-pressure extruder while heating the die, continuously extruding the product A onto the outer surface of the steel pipe which axially moves at a constant speed, and integrally and continuously extruding and molding PFA plastic and the steel pipe to obtain a product B; and S3, performing stress relief treatment on the B product to obtain the composite plastic-coated steel pipe. The composite plastic-coated steel pipe provided by the invention has smooth surface, is not easy to accumulate dust, and has simple coating process and is more economic.
Description
Technical Field
The invention relates to the field of composite plastic-coated steel pipes, in particular to a composite plastic-coated steel pipe and a production method thereof.
Background
In order to prevent the steel pipe from being corroded and damaged in the use environment, the surface of the steel pipe is generally isolated from the external environment by covering the steel pipe with plastic or paint. Steel pipes covered with plastic are usually manufactured by die-casting or sleeving a plastic pipe onto the outer surface of the steel pipe, or by sleeving a plastic pipe onto the outer surface of the steel pipe, thereby forming a plastic steel pipe. However, in the production method, air holes are easily generated during production, which not only causes poor connection stability between the plastic pipe and the steel pipe and easy separation of the plastic pipe from the steel pipe, but also affects the isolation effect of the plastic pipe on the surface of the steel pipe, and causes short service life of the steel pipe. In addition, the plastic sleeve on the plastic steel pipe produced by the production method has larger thickness, so that the material cost is higher, and when the plastic sleeve is used as a heat exchange pipe, the thermal resistance is larger and the heat exchange effect is poorer. Therefore, the existing plastic steel pipe production method has the problems of easy generation of air holes, poor connection stability between the plastic pipe and the steel pipe, poor isolation effect, short service life of the steel pipe, high material cost, high thermal resistance of a finished product and poor heat exchange effect of the finished product.
The publication No. CN105946194A discloses a method for producing fluoroplastic steel tubes, which comprises the steps of firstly enabling fluoroplastic powder to rotate centrifugally through a centrifugal machine, and removing impurities in the fluoroplastic powder through centrifugal force; plasticizing the product A to enable the product A to enter a plasticizing flowing state, then extruding the fluoroplastic into a mold through a high-pressure extruder and continuously extruding the fluoroplastic on the outer surface of the steel pipe, and integrally and continuously extruding the fluoroplastic and the steel pipe for molding; and finally, placing the mixture in a curing channel for heating and then removing stress to obtain a finished product. The invention can not only avoid the generation of air holes, improve the connection stability, improve the isolation effect and prolong the service life of the steel pipe, but also has the advantages of lower material cost, small heat resistance of the finished product, good heat exchange effect of the finished product and high production efficiency. However, the above production method still has the following drawbacks:
(1) The prepared pipe has a rough surface and is easy to deposit dust.
(2) A layer of plastic is extruded outside the fluoroplastic steel pipe, and cracks can be seen through amplification, so that the fluoroplastic steel pipe is poor in isolation effect, and the service life is relatively short.
(3) The fluoroplastic powder needs to be centrifuged to remove impurities, which wastes time and labor.
(4) The fluoroplastic powder needs to be pretreated, and aviation kerosene with high cost needs to be added, so that the production cost of the fluoroplastic steel pipe is greatly increased.
Disclosure of Invention
1. Technical problem to be solved
Aiming at the problems in the prior art, the invention aims to provide a composite plastic-coated steel pipe, and the invention aims to provide a preparation method of the composite plastic-coated steel pipe.
2. Technical scheme
In order to solve the above problems, the present invention adopts the following technical solutions.
A composite plastic-coated steel pipe is prepared by coating a PFA film on a steel pipe, and the coating process comprises the following steps:
s1, plasticizing PFA particles to enable PFA plastic to be in a flowing state to obtain a product A;
s2, adding the die into the curing channel for heating, extruding the product A into the die through a high-pressure extruder while heating the die, continuously extruding the product A onto the outer surface of the steel pipe axially moving at a constant speed, and integrally and continuously extruding and molding PFA plastic and the steel pipe to obtain a product B;
and S3, performing stress relief treatment on the B product to obtain the composite plastic-coated steel pipe.
The PFA membrane is at least one layer.
The specific coating process is the coating process of each PFA film.
The mould is a conventional extrusion molding film-coating mould.
Further, the PFA film covering the steel pipe is a double layer, the double layer PFA film is tensioned on the outer periphery side of the steel pipe, and no air gap exists between the inner PFA film and the outer PFA film.
Further, the thickness of each PFA film is 0.25 mm-3 mm.
Furthermore, the step S2 of integrated continuous extrusion molding is to place the steel pipe in a mold, so that a cavity is formed between the mold and the outer surface of the steel pipe, and finally, the product A is extruded into the cavity to be integrally extruded with the steel pipe, and the steel pipe moves at a constant speed in the mold, so that the product A is continuously extruded on the outer surface of the steel pipe.
Furthermore, the caliber of the steel pipe is 10 mm-60 mm, and the thickness of the steel pipe is 0.5 mm-6 mm.
Further, in the step S2, a high-pressure extruder applies extrusion force of 20MPa to the product A, heats the product A to 65 ℃, and then extrudes the product A into a first die; the axial moving speed of the steel pipe is 0.7 m/min.
Further, the curing channel comprises 4 channels which are connected in sequence and have the length of 3 meters, and the heating temperature of the 4 channels is 100 ℃, 200 ℃, 300 ℃ and 400 ℃ in sequence.
Further, the article A was moved in the curing passage at a speed of 0.7 m/min.
Further, the stress removing treatment is carried out by introducing the stress removing treatment into a cooling channel at the speed of 0.7 m/min for cooling; the cooling channel comprises a cooling section at 300 ℃, an air cooling section at 100 ℃ and a water cooling section at normal temperature which are sequentially connected, wherein the length of the cooling section is 3 meters, the length of the air cooling section is 7 meters, and the length of the water cooling section is 2 meters.
A production method of a composite plastic-coated steel pipe comprises the following steps:
s1, plasticizing PFA particles to enable PFA plastic to be in a flowing state to obtain a product A;
s2, adding the first die into the curing channel for heating, extruding the product A into the first die through a high-pressure extruder while heating the first die, continuously extruding the product A onto the outer surface of the steel pipe axially moving at a constant speed, and integrally and continuously extruding and molding PFA plastic and the steel pipe to obtain a product B;
and S3, performing stress relief treatment on the product B to obtain a finished product C.
Plasticization refers to the entire process of heating the plastic in the cylinder to a fluid state and having good plasticity.
Further, the continuous extrusion molding of integral type in step S2 is to place the steel pipe in first mould, make and form the die cavity between first mould and the steel pipe surface, extrude article A into the die cavity finally and steel pipe integral type extrusion molding, the steel pipe is at the uniform velocity in first mould simultaneously, makes article A extrude the plastic on the steel pipe surface continuously.
Further, the caliber of the steel pipe is 10 mm-60 mm, the thickness of the steel pipe is 0.5 mm-6 mm, and the thickness of a cavity formed between the first die and the outer surface of the steel pipe in the step S2 is 0.25 mm-3 mm.
Further, in the step S2, a high-pressure extruder applies extrusion force of 20MPa to the product A, heats the product A to 65 ℃, and then extrudes the product A into a first die; the axial moving speed of the steel pipe is 0.7 m/min.
Further, the stress removing treatment in the step S3 is carried out by introducing the stress into a cooling channel at a speed of 0.7 m/min for cooling; the cooling channel comprises a 300 ℃ cooling section, a 100 ℃ air cooling section and a normal temperature water cooling section which are sequentially connected, wherein the cooling section is 3 meters in length, the air cooling section is 7 meters in length, and the water cooling section is 2 meters in length.
The curing channel in the step S2 comprises 4 channels which are sequentially connected and have the length of 3 meters, and the heating temperature of the 4 channels is 100 ℃, 200 ℃, 300 ℃ and 400 ℃ sequentially; the moving speed of the product A in the curing passage is 0.7 m/min.
Further, the production method of the composite plastic-coated steel pipe also comprises a step S4 and a step S5;
s4, placing the finished product C obtained in the step S3 in a second mold, enabling a cavity to be formed between the second mold and the outer surface of the finished product C, then adding the second mold into a curing channel for heating, extruding the product A into the cavity while heating the second mold, and integrally extruding and molding the product A and the finished product C, and enabling the finished product C to move in the second mold at a constant speed, so that the product A is continuously extruded and molded on the outer surface of the finished product C, and obtaining a product D;
and S5, performing stress relief treatment on the product D to obtain the composite plastic-coated steel pipe.
Further, the stress removing treatment in the step S4 is carried out by introducing the stress into a cooling channel at a speed of 0.7 m/min for cooling; the cooling channel comprises a cooling section at 300 ℃, an air cooling section at 100 ℃ and a water cooling section at normal temperature which are sequentially connected, wherein the length of the cooling section is 3 meters, the length of the air cooling section is 7 meters, and the length of the water cooling section is 2 meters.
Further, the curing channel in the step S4 comprises 4 channels which are sequentially connected and have the length of 3 meters, and the heating temperatures of the 4 channels are 100 ℃, 200 ℃, 300 ℃ and 400 ℃ sequentially; the moving speed of the A product in the curing channel is 0.7 m/min.
Further, the thickness of a cavity formed between the second mold in the step S4 and the outer surface of the finished product C is 0.25mm to 3mm.
Further, the high-pressure extruder in the step S4 applies extrusion force of 20MPa to the product A, heats the product A to 65 ℃, and then extrudes the product A into a second die; the axial moving speed of the finished product C is 0.7 m/min.
Further, the thickness of the cavity formed between the second mold and the outer surface of the finished product C in the step S4 is different from the thickness of the cavity formed between the first mold and the outer surface of the steel pipe in the step S2.
Further, the first die and the second die are both conventional extrusion molding film covering dies.
3. Advantageous effects
Compared with the prior art, the invention has the advantages that:
(1) The invention produces the composite plastic-coated steel pipe by using the PFA plastic and the steel pipe through integral extrusion molding, the PFA plastic subjected to plasticizing treatment has good fluidity, the surface of the formed composite plastic-coated steel pipe is smooth, dust is not easy to accumulate, and the PFA plastic does not need to be subjected to impurity removal when the composite plastic-coated steel pipe is processed, and the PFA plastic does not need to be subjected to pretreatment by aviation kerosene, so that the fluidity of the plastic is improved, the generation of air holes is avoided, and further, the production steps and the processing cost of the composite plastic-coated steel pipe can be reduced.
(2) According to the invention, the double-layer film coating processing is carried out outside the steel pipe, so that the defect that a single-layer film is cracked when the steel pipe is subjected to thermal expansion and cold contraction due to temperature change is overcome, and the service life of the composite steel pipe is shortened; the invention covers two layers of PFA plastics outside the steel pipe, and the extrusion molding and heating are carried out simultaneously in the process of covering each layer of PFA plastic film, so that the PFA plastics and the steel pipe are molded by extrusion in an integrated manner, the molecular gap between the two PFA films is small, when the two PFA films expand by heating and generate cracks, the cracks can be mutually filled, the barrier property of a composite layer outside the steel pipe is improved, the difficulty of contacting sewage and the like with the outer surface of the steel pipe is further improved, the service life of the steel pipe is prolonged, and the service life of the composite plastic-coated steel pipe is longer than that of the fluoroplastic steel pipe processed by the fluoroplastic steel pipe production method recorded in the background technology.
Detailed Description
The present invention is further illustrated by the following examples, which are not to be construed as limiting the invention.
Example 1: a production method of a composite plastic-coated steel pipe is characterized in that the composite plastic-coated steel pipe is made by coating a steel pipe with a single PFA film, the thickness of the PFA film is 0.25mm, and the production method comprises the following specific processing steps:
s1, plasticizing PFA particles to enable PFA plastic to be in a flowing state to obtain a product A;
s2, adding the first die into the curing channel for heating, extruding the product A into the first die through a high-pressure extruder while heating the first die, continuously extruding the product A onto the outer surface of the steel pipe axially moving at a constant speed, and integrally and continuously extruding and molding PFA plastic and the steel pipe to obtain a product B;
and S3, performing stress relief treatment on the B product to obtain the composite plastic-coated steel pipe.
And in the step S2, a cavity with the thickness of 0.25mm is formed between the first die and the outer surface of the steel pipe.
The caliber of the steel pipe is 40mm, and the thickness of the steel pipe is 3mm.
And S2, placing the steel pipe in a first die to form a cavity between the first die and the outer surface of the steel pipe, extruding the product A into the cavity to be integrally extruded with the steel pipe, and simultaneously moving the steel pipe in the first die at a constant speed to continuously extrude the product A onto the outer surface of the steel pipe.
In the step S2, a high-pressure extruder applies 20MPa of extrusion force to the product A, heats the product A to 65 ℃, and then extrudes the product A into a first die; the axial moving speed of the steel pipe is 0.7 m/min.
The curing channel comprises 4 channels which are sequentially connected and have the length of 3 meters, and the heating temperature of the 4 channels is 100 ℃, 200 ℃, 300 ℃ and 400 ℃ sequentially; the moving speed of the product A in the curing passage is 0.7 m/min.
The stress removing treatment is carried out by introducing the stress removing treatment into a cooling channel at the speed of 0.7 m/min for cooling; the cooling channel comprises a cooling section at 300 ℃, an air cooling section at 100 ℃ and a water cooling section at normal temperature which are sequentially connected, wherein the length of the cooling section is 3 meters, the length of the air cooling section is 7 meters, and the length of the water cooling section is 2 meters.
Example 2: a production method of a composite plastic-coated steel pipe is characterized in that the composite plastic-coated steel pipe is made by coating a steel pipe with a single PFA film, the thickness of the PFA film is 0.28mm, and the production method comprises the following specific processing steps:
s1, plasticizing PFA particles to enable PFA plastic to be in a flowing state to obtain a product A;
s2, adding the first mold into a curing channel for heating, applying extrusion force of 20MPa to the product A through a high-pressure extruder while heating the first mold, heating the product A to 65 ℃, extruding the product A into the first mold, continuously extruding the product A onto the outer surface of the steel pipe which axially moves at a constant speed, and integrally and continuously extruding and molding PFA plastic and the steel pipe to obtain a product B;
and S3, performing stress relief treatment on the B product to obtain the composite plastic-coated steel pipe.
And in the step S2, a cavity with the thickness of 0.28mm is formed between the first die and the outer surface of the steel pipe.
The caliber of the steel pipe is 40mm, and the thickness of the steel pipe is 3mm.
And S2, placing the steel pipe in a first die to form a cavity between the first die and the outer surface of the steel pipe, extruding the product A into the cavity to be integrally extruded with the steel pipe, and simultaneously moving the steel pipe in the first die at a constant speed to continuously extrude the product A onto the outer surface of the steel pipe.
In the step S2, a high-pressure extruder applies 20MPa of extrusion force to the product A, heats the product A to 65 ℃, and then extrudes the product A into a first die; the axial moving speed of the steel pipe is 0.7 m/min.
The curing channel comprises 4 sequentially connected channels with the length of 3 meters, and the heating temperatures of the 4 channels are 100 ℃, 200 ℃, 300 ℃ and 400 ℃ sequentially; the moving speed of the product A in the curing passage is 0.7 m/min.
The stress removing treatment is carried out by introducing the stress removing treatment into a cooling channel at the speed of 0.7 m/min for cooling; the cooling channel comprises a 300 ℃ cooling section, a 100 ℃ air cooling section and a normal temperature water cooling section which are sequentially connected, wherein the cooling section is 3 meters in length, the air cooling section is 7 meters in length, and the water cooling section is 2 meters in length.
Example 3: a production method of a composite plastic-coated steel pipe is characterized in that the composite plastic-coated steel pipe is made by coating a steel pipe with a double-layer PFA film, the thickness of the PFA film on the inner layer is 0.25mm, the thickness of the PFA film on the outer layer is 0.28mm, and the production method comprises the following specific processing steps:
s1, plasticizing PFA particles to enable PFA plastic to be in a flowing state to obtain a product A;
s2, adding the first mold into a curing channel for heating, applying extrusion force of 20MPa to the product A through a high-pressure extruder while heating the first mold, heating the product A to 65 ℃, extruding the product A into the first mold, continuously extruding the product A onto the outer surface of the steel pipe which axially moves at a constant speed, and integrally and continuously extruding and molding PFA plastic and the steel pipe to obtain a product B;
and S3, performing stress relief treatment on the product B to obtain a finished product C.
S4, placing the finished product C obtained in the step S3 in a second mold, enabling a cavity to be formed between the second mold and the outer surface of the finished product C, then adding the second mold into a curing channel for heating, extruding the product A into the cavity while heating the second mold, and integrally extruding and molding the product A and the finished product C, and enabling the finished product C to move in the second mold at a constant speed, so that the product A is continuously extruded and molded on the outer surface of the finished product C, and obtaining a product D;
and S5, performing stress relief treatment on the D product to obtain the composite plastic-coated steel pipe.
The thickness of a cavity formed between the second mold in the step S4 and the outer surface of the finished product C is 0.28mm, and the thickness of a cavity formed between the first mold in the step S2 and the outer surface of the steel pipe is 0.25mm.
The caliber of the steel pipe is 40mm, and the thickness of the steel pipe is 3mm.
The curing channel comprises 4 channels which are sequentially connected and have the length of 3 meters, and the heating temperature of the 4 channels is 100 ℃, 200 ℃, 300 ℃ and 400 ℃ sequentially; the moving speed of the product A in the curing passage is 0.7 m/min.
In the step S2, a high-pressure extruder applies 20MPa of extrusion force to the product A, heats the product A to 65 ℃, and then extrudes the product A into a first die; the axial moving speed of the steel pipe is 0.7 m/min.
And S2, placing the steel pipe in a first die to form a cavity between the first die and the outer surface of the steel pipe, extruding the product A into the cavity to be integrally extruded with the steel pipe, and simultaneously moving the steel pipe in the first die at a constant speed to continuously extrude the product A onto the outer surface of the steel pipe.
The high-pressure extruder in the step S4 applies extrusion force of 20MPa to the product A, heats the product A to 65 ℃, and then extrudes the product A into a second die; the axial moving speed of the finished product C is 0.7 m/min.
The curing channel comprises 4 channels which are sequentially connected and have the length of 3 meters, and the heating temperature of the 4 channels is 100 ℃, 200 ℃, 300 ℃ and 400 ℃ sequentially; the moving speed of the product A in the curing passage is 0.7 m/min.
The stress removing treatment is carried out by introducing the stress removing treatment into a cooling channel at the speed of 0.7 m/min for cooling; the cooling channel comprises a 300 ℃ cooling section, a 100 ℃ air cooling section and a normal temperature water cooling section which are sequentially connected, wherein the cooling section is 3 meters in length, the air cooling section is 7 meters in length, and the water cooling section is 2 meters in length.
Example 4: a compound plastic-coated steel pipe is produced by coating a steel pipe with a double-layer PFA film, wherein the thickness of the PFA film on the inner layer is 0.25mm, and the thickness of the PFA film on the outer layer is 0.25mm, and the method comprises the following specific processing steps:
s1, plasticizing PFA particles to enable PFA plastic to be in a flowing state to obtain a product A;
s2, adding the first mould into a curing channel for heating, applying extrusion force of 20MPa to the product A through a high-pressure extruder while heating the first mould, heating the product A to 65 ℃, and extruding the product A into the first mould, so that the product A is continuously extruded on the outer surface of a steel pipe which axially moves at a constant speed, and integrally and continuously extruding and molding PFA plastic and the steel pipe to obtain a product B;
and S3, performing stress relief treatment on the product B to obtain a finished product C.
S4, placing the finished product C obtained in the step S3 in a second mold, enabling a cavity to be formed between the second mold and the outer surface of the finished product C, then adding the second mold into a curing channel for heating, extruding the product A into the cavity while heating the second mold, and integrally extruding and molding the product A and the finished product C, and enabling the finished product C to move in the second mold at a constant speed, so that the product A is continuously extruded and molded on the outer surface of the finished product C, and obtaining a product D;
and S5, performing stress relief treatment on the product D to obtain the composite plastic-coated steel pipe.
And the thickness of a cavity formed between the second die and the outer surface of the finished product C in the step S4 is 0.25mm, and the thickness of a cavity formed between the first die and the outer surface of the steel pipe in the step S2 is 0.25mm.
The caliber of the steel pipe is 40mm, and the thickness of the steel pipe is 3mm.
The curing channel comprises 4 sequentially connected channels with the length of 3 meters, and the heating temperatures of the 4 channels are 100 ℃, 200 ℃, 300 ℃ and 400 ℃ sequentially; the moving speed of the A product in the curing channel is 0.7 m/min.
And S2, placing the steel pipe in a first die to form a cavity between the first die and the outer surface of the steel pipe, extruding the product A into the cavity to be integrally extruded with the steel pipe, and simultaneously moving the steel pipe in the first die at a constant speed to continuously extrude the product A onto the outer surface of the steel pipe.
In the step S2, a high-pressure extruder applies 20MPa of extrusion force to the product A, heats the product A to 65 ℃, and then extrudes the product A into a first die; the axial moving speed of the steel pipe is 0.7 m/min.
The high-pressure extruder in the step S4 applies extrusion force of 20MPa to the product A, heats the product A to 65 ℃, and then extrudes the product A into a second die; the axial moving speed of the finished product C is 0.7 m/min.
The stress removing treatment is carried out by introducing the stress removing treatment into a cooling channel at the speed of 0.7 m/min for cooling; the cooling channel comprises a 300 ℃ cooling section, a 100 ℃ air cooling section and a normal temperature water cooling section which are sequentially connected, wherein the cooling section is 3 meters in length, the air cooling section is 7 meters in length, and the water cooling section is 2 meters in length.
Claims (10)
1. A composite plastic-coated steel pipe is characterized in that: the steel pipe is coated with a PFA film, and the specific coating process is as follows:
s1, plasticizing PFA particles to enable PFA plastic to be in a flowing state to obtain a product A;
s2, adding the die into the curing channel for heating, extruding the product A into the die through a high-pressure extruder while heating the die, continuously extruding the product A onto the outer surface of the steel pipe axially moving at a constant speed, and integrally and continuously extruding and molding PFA plastic and the steel pipe to obtain a product B;
and S3, performing stress relief treatment on the B product to obtain the composite plastic-coated steel pipe.
2. A composite coated steel pipe as claimed in claim 1, wherein: the PFA film covering the steel pipe is double-layer, the double-layer PFA film is tensioned on the outer periphery of the steel pipe, and no air gap exists between the inner PFA film and the outer PFA film.
3. A composite coated steel tube as claimed in claim 1, wherein: the thickness of each PFA film is 0.25 mm-3 mm.
4. A production method of a composite plastic-coated steel pipe is characterized by comprising the following steps: the method comprises the following steps:
s1, plasticizing PFA particles to enable PFA plastic to be in a flowing state to obtain a product A;
s2, adding the first die into the curing channel for heating, extruding the product A into the first die through a high-pressure extruder while heating the first die, continuously extruding the product A onto the outer surface of the steel pipe axially moving at a constant speed, and integrally and continuously extruding and molding PFA plastic and the steel pipe to obtain a product B;
and S3, performing stress relief treatment on the product B to obtain a finished product C.
5. A method of manufacturing a composite coated steel tube as claimed in claim 4, wherein: and S2, placing the steel pipe in a first die to form a cavity between the first die and the outer surface of the steel pipe, extruding the product A into the cavity to be integrally extruded with the steel pipe, and simultaneously moving the steel pipe in the first die at a constant speed to continuously extrude the product A onto the outer surface of the steel pipe.
6. In the step S2, a high-pressure extruder applies 20MPa of extrusion force to the product A, heats the product A to 65 ℃ and extrudes the product A into a first die; the axial moving speed of the steel pipe is 0.7 m/min.
7. A method of manufacturing a composite coated steel pipe as claimed in claim 4, wherein: further comprising step S4 and step S5;
s4, placing the finished product C obtained in the step S3 in a second mold, enabling a cavity to be formed between the second mold and the outer surface of the finished product C, then adding the second mold into a curing channel for heating, extruding the product A into the cavity while heating the second mold, and integrally extruding and molding the product A and the finished product C, and enabling the finished product C to move in the second mold at a constant speed, so that the product A is continuously extruded and molded on the outer surface of the finished product C, and obtaining a product D;
and S5, performing stress relief treatment on the D product to obtain the composite plastic-coated steel pipe.
8. The method of claim 7, wherein the method comprises the steps of: the high-pressure extruder in the step S4 applies extrusion force of 20MPa to the product A, heats the product A to 65 ℃, and then extrudes the product A into a second die; the axial moving speed of the finished product C is 0.7 m/min.
9. A method of producing a composite coated steel tube as claimed in claim 4 or 7, wherein: removing stress, and introducing into a cooling channel at a speed of 0.7 m/min for cooling; the cooling channel comprises a 300 ℃ cooling section, a 100 ℃ air cooling section and a normal temperature water cooling section which are sequentially connected, wherein the cooling section is 3 meters in length, the air cooling section is 7 meters in length, and the water cooling section is 2 meters in length.
10. A method of producing a composite coated steel tube as claimed in claim 4 or 7, wherein: the curing channel comprises 4 channels which are sequentially connected and have the length of 3 meters, and the heating temperature of the 4 channels is 100 ℃, 200 ℃, 300 ℃ and 400 ℃ sequentially; the moving speed of the product A in the curing passage is 0.7 m/min.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211412157.6A CN115750932A (en) | 2022-11-11 | 2022-11-11 | Composite plastic-coated steel pipe and production method thereof |
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| CN202211412157.6A CN115750932A (en) | 2022-11-11 | 2022-11-11 | Composite plastic-coated steel pipe and production method thereof |
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| CN115750932A true CN115750932A (en) | 2023-03-07 |
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| CN202211412157.6A Pending CN115750932A (en) | 2022-11-11 | 2022-11-11 | Composite plastic-coated steel pipe and production method thereof |
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