KR101860315B1 - Manufacturing Method of Large Stainless Steel Pipe with resin shield - Google Patents

Abstract

The present invention provides a manufacturing method for a large stainless-steel pipe comprising a resin shield. The manufacturing method comprises the steps of: preparing a stainless-steel thin plate in the shape of a square; bending the square thin plate into a circular shape such that mutually facing sides of the square thin plate are joined with each other; welding a welding part at which the sides of the square thin plate are joined; removing burrs from the welding part to form a stainless-steel pipe; and preparing a holder to hold the stainless-steel pipe, the holder including a rotation tool for causing the stainless-steel pipe to rotate and a linear tool for causing the stainless-steel pipe to perform a linear motion, and mounting the stainless-steel pipe on the holder, wherein a resin for surrounding the surface of the stainless-steel pipe is prepared, the resin being a resin rod drawn from a drawing machine. According to the present invention, the large stainless-steel pipe comprising a resin shield as described above comprises the resin surrounding the surface of the stainless-steel pipe, and thus is easy to handle and protected from corrosion, and provides good thermal insulation capable of protecting a large-diameter water pipe from damage due to temperature changes and consequently enhancing the durability thereof.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a manufacturing method of a large stainless steel pipe having a resin protective film,

The present invention relates to a large-sized stainless steel pipe having a resin protective film, and more particularly, to a resin pipe having a resin covering a surface of a stainless steel pipe, wherein a resin film is formed by directly using a resin rod drawn from a drawer To a large-sized stainless steel pipe provided with a resin protective film.

Generally, large diameter pipes are mainly used for casting pipes, but they are susceptible to corrosion, and they are used as copper pipes, stainless pipes, PE pipes, etc. to provide corrosion resistance.

However, conventional PE pipes contain substances harmful to the human body, and not only the water quality is contaminated but also the rigidity is low, so they are vulnerable to strong water pressure. In the case of a copper or stainless steel pipe, the price is too high to manufacture a large diameter pipe, and a sudden change in temperature causes shortening or destruction of the life of the conventional large diameter pipe. In addition, existing casting pipes are easily rusted, which may cause contamination of tap water due to harmful influence of inorganic substances such as rust and heavy metals.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a method of manufacturing a stainless steel pipe by welding a stainless steel square plate to form a stainless steel pipe, The present invention provides a large-sized stainless steel pipe provided with a resin protective film.

However, the object of the present invention is not limited to the above-mentioned object, and another object which is not mentioned can be understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a method of manufacturing a stainless steel sheet, And bending the rectangular thin plate so as to face opposite sides of the rectangular thin plate; And welding the abutting welded portion of the rectangular thin plate; And removing a bar of the welded portion to form a stainless steel pipe; And a mounting table for mounting the stainless steel pipe, wherein the mounting table is provided with a rotary fixture for rotating the stainless steel pipe and a straight fixture for linearly moving the stainless steel pipe, And a resin surrounding the surface of the stainless steel tube, wherein the resin is a resin sheet drawn from a drawing machine.

A method of manufacturing a stainless steel sheet, comprising the steps of: preparing a roll having a thin stainless steel sheet wound thereon; unwinding the rolled roll; and forming a plurality of opposite sides of the thin stainless steel sheet so as to overlap each other at a constant thickness, A welding step of welding the welding part to maintain the airtightness of the welding part at a predetermined thickness, forming a stainless steel pipe by removing the barrel of the welding part, and a holder for mounting the stainless steel pipe, The stainless steel pipe is provided with a rotating fixture for rotating the stainless steel pipe and a straightening fixture for linearly moving the stainless steel pipe, the stainless steel pipe being mounted on the tooth, and a resin surrounding the surface of the stainless steel pipe, Wherein the resin film is a resin film drawn out from the resin film And more particularly, to a method of manufacturing a large-sized stainless steel pipe.

The thickness of the stainless steel sheet is 0.5 to 1.5 mm, the height of the cross-section of the resin is 20 to 30 mm, and the lengths of the abutted sides and the vertical grooves are 1200 to 31400 mm. When the stainless steel sheet is formed of the stainless steel tube, Wherein the thickness of the stainless steel pipe is 0.5 to 1.5 mm and the diameter of the stainless steel pipe is 200 to 5000 mm.

Further, the height of the cross section of the resin means a diameter when the shape of the resin is a cylindrical shape, and a length of one side when it is a square column, and a method of manufacturing a large stainless steel tube equipped with the resin protective film .

The drawer may further include a hopper for receiving a plastic chip and a first heater for melting the plastic chip placed in the hopper; And a screw for extruding the melted plastic through the first heater portion; And a nozzle for drawing the plastic to be extruded by the screw into a bar shape; And a first cooling unit for cooling the drawn bar-shaped resin; The present invention relates to a method for manufacturing a large-sized stainless steel pipe provided with a resin protective film.

Further, the present invention provides a method of manufacturing a stainless steel pipe, comprising the steps of: cooling a rod-shaped resin drawn from the nozzle and attaching the cooled rod-shaped resin to a surface of the stainless steel tube mounted on the rack; And continuously drawing the rod-like resin from the drawer; And rotating the stainless steel pipe in such a manner that the rod-like resin continuously drawn is spirally wrapped around the outer surface of the stainless steel pipe; And adjusting the rotational speed of the rotational motion and the velocity of the rectilinear transfer motion so that the surface of the stainless steel pipe is not filled with the spiral-shaped rod-shaped resin. The present invention relates to a method for manufacturing a large-sized stainless steel pipe provided with a resin protective film.

Further, the present invention provides a method of manufacturing a spirally wound rod-shaped resin, comprising the steps of: (a) providing a thermally pressurizing means for thermally pressing the rod- The present invention relates to a large stainless steel pipe provided with a resin protective film.

The heat pressing means may include a second heater portion for heating the bar-shaped side portions arranged in a spiral manner; A heating step of heating the rod-like side portion through the heater portion; And a pressing portion for pressing the fused portion when the bar-shaped side portions are fused to each other through the heating step; And pressing the fused portion to the input pressure through the pressing portion to couple the fused portion; And a second cooling unit for cooling the press welded part; And cooling the fusion site; The present invention relates to a method for manufacturing a large-sized stainless steel pipe provided with a resin protective film.

The heat pressing means of the present invention may further include a step of adjusting the thickness of the resin protective film disposed on the surface of the stainless steel tube so as to be spaced apart from the surface of the stainless steel tube by a predetermined distance. The present invention relates to a method for manufacturing a large-sized stainless steel pipe provided with a resin protective film.

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings.

Prior to that, terms and words used in the present specification and claims should not be construed in a conventional and dictionary sense, and the inventor may properly define the concept of the term in order to best explain its invention It should be construed as meaning and concept consistent with the technical idea of the present invention.

As described above, according to the present invention, since the resin surrounding the surface of the stainless steel pipe is provided, it is easy to handle, and corrosion is prevented, thereby providing excellent heat insulation, thereby preventing breakage of the large- .

In addition, the present invention provides a sanitary tap water passage and a cost reduction by forming a stainless steel pipe using a stainless steel plate having a thickness of 0.5 to 1.5 mm.

In addition, the resin covering the surface of the stainless steel pipe is formed on the surface of the stainless steel pipe with a thickness of 20 to 30 mm, so that it can withstand the heavy load and has the effect of improving the rigidity.

That is, the thickness of the stainless steel sheet is 0.5 to 1.5 mm, the thickness of the resin is 20 to 30 mm, and the lengths of the abutted sides and the vertical grooves are 1200 to 31400 mm. When the stainless steel tube is formed of stainless steel, And the diameter of the stainless steel pipe is 200 to 5000 mm as the length of the vertical side is 1200 to 31400 mm.

1 shows a step of preparing a stainless steel sheet according to the present invention.
Figure 2 shows the steps of forming the stainless steel tube of the present invention.
Fig. 3 shows a step of providing a resin surrounding the surface of the stainless steel tube of the present invention.
FIG. 4 shows a large stainless steel pipe provided with the resin protective film of the present invention.
Fig. 5 shows a step of preparing a stainless steel sheet according to a second embodiment of the present invention.
6 is a view showing a step of providing a resin surrounding a surface of a stainless steel pipe according to a second embodiment of the present invention.
7 shows a large stainless steel pipe provided with a resin protective film according to a second embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation.

In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

In addition, the following embodiments are not intended to limit the scope of the present invention, but merely as exemplifications of the constituent elements set forth in the claims of the present invention, and are included in technical ideas throughout the specification of the present invention, Embodiments that include substitutable elements as equivalents to the elements may be included within the scope of the present invention.

FIG. 1 is a view showing a step of preparing a stainless steel sheet according to the present invention, FIG. 2 is a view showing a step of forming a stainless steel tube according to the present invention, and FIG. 4 is a view showing a large stainless steel pipe provided with a protective resin film of the present invention, FIG. 5 is a view showing a step of preparing a stainless steel sheet according to a second embodiment of the present invention, and FIG. 6 7 shows a large stainless steel pipe with a resin protective film according to a second embodiment of the present invention .

The steps of preparing the stainless steel pipe of the present invention will be described with reference to Figs. 1 and 2. Fig.

Referring to FIG. 1, a large stainless steel pipe provided with a resin protective film of the present invention comprises a step of preparing a stainless steel thin plate (see FIG. 1 (a)) and a step of bending the stainless steel thin plate in a circular shape (See FIG. 2 (b)) and a welded portion where the square thin plate is in contact with each other to form a thin plate stainless steel pipe (see FIG. In this case, the thickness T1 of the stainless steel sheet is suitably 0.5 to 1.5 mm, and the length L1 of the side edges and the vertical sides of the stainless steel sheet is 1200 to 31400 mm.

The length (L1) of the vertical grooves is a diameter related to the diameter when the stainless steel tube is bent into a circular shape. When the length is 1200 to 31400 mm, the diameter is 380 to 1000 mm. When the length is 600 to 15700 mm, To 500 mm.

Therefore, in the case of a large water pipe, a diameter of 200 to 3,000 mm is suitable, so the length of the corresponding vertical side may be determined to be about 600 to 10000.

The steps of forming the stainless steel pipe 100 of the present invention will be described with reference to FIG.

Referring to FIG. 2, the large stainless steel pipe provided with the resin protective film of the present invention is manufactured by: welding the abutting welded portion 101 of the circularly bent rectangular thin plate; And removing the barb of the welding part (101) with a grinder (120) to form a stainless steel pipe (100); .

At this time, the welding apparatus 110 is mounted to weld the welded joint portion 101 where the thin plate is bent in a circular shape while being mounted on a jig that is bent in a circular shape. The welding apparatus 110 is provided with a torch 112 to weld the portion 101 to be welded and the welding apparatus is provided with a rotary roller 150 to move the stainless steel pipe 100 in a straight direction .

At this time, the rotary rollers 150 of the welding apparatus can be fixed or movable. If the welding apparatus 110 is fixed, the stainless steel pipe 100 moves. On the contrary, when the welding apparatus moves, the stainless steel pipe is stopped.

The stainless steel pipe 100 is completed by placing the grinding machine 120 on the welded stainless steel pipe 101 to remove the barrel if necessary.

3 and 4, the step of wrapping the surface of the stainless steel pipe 100 of the present invention with the drawn resin rod 260 from the drawer 200 will be described.

Referring to FIG. 3, the large stainless steel pipe provided with the protective resin film of the present invention includes a holder 130 for holding the stainless steel pipe 100, and a rotary jig (not shown) for rotating the stainless steel pipe (Not shown) for linearly moving the stainless steel tube 100 and the stainless steel tube 100. The stainless steel tube 100 is mounted on the holder 130 and a resin for wrapping the surface of the stainless steel tube, And the handle bar 260 drawn out from the handle 200 is directly used.

The ejector 200 includes a hopper 210 for receiving a plastic chip and a first heater 220 for melting the plastic chip placed in the hopper. And a screw 230 for extruding the melted plastic through the first heater part. And a nozzle (240) for drawing the plastic extruded into the shape of a bar into a screw shape; And a first cooling part (250) for cooling the drawn bar type resin (260); .

At this time, the resin 260 of the bar-shaped yarn cooled in the first cooling unit 250 is placed on the rotating roller A and the feeding motion is progressed.

The present invention further provides a method of manufacturing a stainless steel pipe, comprising the steps of: cooling a rod-like resin (260) drawn from the nozzle (240) and attaching the cooled rod-shaped resin to a surface of the stainless steel pipe (100) And continuously drawing the rod-like resin 260 from the drawer 200. The continuous resin 260 is drawn out from the stainless steel pipe 100 so as to spirally cover the outer surface of the stainless steel pipe 100, The method of manufacturing a stainless steel pipe (100) according to any one of claims 1 to 3, wherein the step of rotating and moving the tube (100) Adjusting the speed of the transfer motion; .

Wherein the spiral-shaped rod-shaped resin (260) comprises a thermal pressurizing means for thermally pressing the side faces to be coupled to each other when the spiral-shaped resin is wrapped around the spiral-shaped resin. .

Further, the heat pressing means of the present invention may include a second heater portion 270 for heating the spiral-shaped side portions arranged in a helical manner; A heating step of heating the bar-like side portion through the second heater portion; And a pressing portion 280 for pressing the fused portion when the bar-shaped side portions are fused to each other through the heating step. And pressing the fused portion to the input pressure through the pressing portion 280 to couple the fused portion; And a second cooling unit (290) for cooling the press welded portion. And cooling the fusion site; .

Adjusting the thickness of the resin protecting film disposed on the surface of the stainless steel pipe 100 so that the heat pressing means is disposed at a predetermined distance from the surface of the stainless steel pipe 100; .

FIG. 4 shows a large stainless steel pipe provided with the resin protective film of the present invention obtained through the above process.

4, the height T3 of the cross section of the resin 260 is 20 to 30 mm. When the stainless steel sheet is formed of the stainless steel pipe 100, the thickness T2 of the stainless steel pipe is 0.5 to 1.5 mm, The diameter D1 of the tube is 200 to 5000 mm.

Here, the height 260 of the cross section of the resin means a diameter when the shape of the resin is cylindrical, and a length of one side when it is a square pillar.

A second embodiment of the present invention will be described with reference to Figs. 5, 6, and 7. Fig.

Referring to FIG. 5, in the large stainless steel pipe provided with the resin protective film according to the second embodiment of the present invention,

Preparing a roll wound with a stainless steel foil; And unwinding the rolled roll; And rotating and linearly moving the opposite sides of the stretched stainless steel sheet so that the opposite sides of the thin stainless steel sheet overlap each other continuously with a constant thickness; And welding the welding portion (101) overlapping with the predetermined thickness; And removing the bar from the welded portion to form a stainless steel pipe (100); And a holder 130 for holding the stainless steel tube. The holder 130 is provided with a rotary jig for rotating the stainless steel tube 100 and a straightening tool for linearly moving the stainless steel tube 100, Mounting step; And a resin surrounding the surface of the stainless steel tube, wherein the resin is a resin sheet drawn from the drawer.

More specifically, a roll-shaped stainless steel sheet is prepared and the stainless steel sheet of the roll shape is continuously rotated so as to overlap the opposing side 101 of the sheet-like shape with a constant thickness, A welder 110 is mounted on the opposite side 101 so that the stainless steel pipe performs a rectilinear movement motion and a rotational movement to weld the opposite side 101 of the stainless steel pipe (see a in FIG. 5)

The stainless steel pipe 100 is completed by placing the grinding machine 120 on the welded stainless steel pipe 101 to remove the barrel as necessary.

Referring to FIG. 6, the large stainless steel pipe provided with the resin protective film of the present invention includes a holder 130 for holding the stainless steel pipe 100, and a rotary jig (not shown) for rotating the stainless steel pipe (Not shown) for linearly moving the stainless steel tube 100 and the stainless steel tube 100. The stainless steel tube 100 is mounted on the holder 130, and a resin for covering the surface of the stainless steel tube is provided, And a rectangular rod-shaped resin rod 260 pulled out from the machine 200 is directly used.

At this time, the quadrangular prism resin 260 cooled in the first cooling unit 250 is placed on the rotating roller A and proceeds in the transport motion.

FIG. 7 illustrates a large stainless steel pipe having a resin protective film according to a second embodiment of the present invention.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the same is by way of illustration and example only and is not to be construed as limiting the present invention. It is obvious that the modification or improvement is possible.

It is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

100 Stainless steel pipe 101 Welding area
110 welding equipment 112 torch
120 grinding machine 130 holder
150 Rotary Rollers 200 Drawer
210 Hopper 220 First heater section
230 screw nozzle 240
250 First cooling part 260 Drawstock plunging resin
270 Second heater part 280 Pressure part
290 Second cooling section

Claims (8)

delete Preparing a roll having a thin stainless steel sheet wound thereon,
Loosening and unwinding the wound roll;
A step of rotating and linearly moving the thin stainless steel sheet while maintaining the same diameter by forming the opposite sides of the stretched thin stainless steel sheet so that the opposite sides of the thin stainless steel sheet are continuously overlapped with each other at a constant thickness,
A welding step of welding the overlapped portion with the predetermined thickness to maintain airtightness;
Forming a stainless steel pipe by removing the barb from the welded portion,
The stainless steel pipe is provided with a mounting base for mounting the stainless steel pipe. The mounting base is provided with a rotary fixture for rotating the stainless steel pipe and a straight fixture for linearly moving the stainless steel pipe,
Wherein the resin is a resin rod drawn from a drawer, and the resin rod is cylindrical or square column-shaped, and the height of the cross section of the resin corresponds to a diameter when the shape of the resin is a cylindrical shape In case of square column type, it corresponds to one side length,
The drawer includes a hopper for inserting a plastic chip and a first heater for melting the plastic chip placed in the hopper, a screw for extruding the melted plastic through the first heater, Preparing a nozzle having a nozzle for drawing in a shape,
And a first cooling section for cooling the drawn bar-shaped resin; Lt; / RTI >
Cooling the rod-like resin drawn from the nozzle and attaching the cooled rod-like resin to the surface of the stainless steel tube which is placed on the holder;
Continuously drawing the rod-shaped resin from the drawer;
A step of rotating and moving the stainless steel pipe in a straight line so as to spirally surround the outer surface of the stainless steel pipe,
Adjusting the rotational speed of the rotational motion and the velocity of the rectilinear transfer motion so that the surface of the stainless steel pipe is not filled with the spiral-shaped rod-shaped resin; Lt; / RTI >
Wherein the spiral-wrapped bar-shaped resin has thermal pressurizing means for thermally pressing the side faces to be coupled to each other when the spiral-wrapped resin is wrapped around the spiral-shaped resin; Lt; / RTI >
Adjusting the thickness of the resin protective film disposed on the surface of the stainless steel pipe so that the heat pressing means is disposed at a predetermined distance from the surface of the stainless steel pipe; , ≪ / RTI &
A heating step of heating the rod-like side portion through the second heater portion 270 with a second heater portion 270 for heating the rod-like side portion arranged in a spiral manner;
When the rod-shaped side portions are fused to each other through the heating step, the pressing portion 280 presses the fused portion so that the fused portion is pressed to the input pressure through the pressing portion 280, And,
And a second cooling unit (290) for cooling the press welded portion,
And cooling the welded portion. The method of manufacturing a large-sized stainless steel pipe according to claim 1,
3. The method of claim 2,
The thickness of the stainless steel sheet is 0.5 to 1.5 mm,
The height of the cross section of the resin is 20 to 30 mm,
When the stainless steel pipe is formed, the thickness of the stainless steel pipe is 0.5 to 1.5 mm,
Wherein the stainless steel pipe has a diameter of 200 to 5000 mm.










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