WO2017155191A1

WO2017155191A1 - Assembly of plated steel pipe and metal fastener, and manufacturing method therefor

Info

Publication number: WO2017155191A1
Application number: PCT/KR2016/015251
Authority: WO
Inventors: 최호섭
Original assignee: 주식회사 블랙스미스
Priority date: 2016-03-11
Filing date: 2016-12-25
Publication date: 2017-09-14
Also published as: CN107709865A; KR20170105922A; CN107709865B

Abstract

The present invention relates to an assembly of a plated steel pipe and a metal fastener, and a manufacturing method therefor. The assembly of a plated steel pipe and a metal fastener comprises: a steel pipe (10) having an outer circumferential surface coated with an antioxidant and having a fastening screw (11) formed on one end of the outer circumferential surface; and a metal fastener (20) having a through hole (21) formed through both sides and having a first screw thread (21) formed on one side thereof and connected to a connection pipe, and a second thread (23) formed on the other side thereof and screwed with the fastening screw (11), wherein an O-ring installing groove (24), into which an O-ring (O) is inserted and fixed, is formed in the metal fastener (20) on the inside of which the second thread (23) is formed, and a nut-shaped nut-forming portion (20A) is formed on the outer circumferential surface of the metal fastener (20). Due to this feature, since the plated steel pipe and the metal fastener are manufactured separately, the manufacturing is simple and thus mass production is easy. Furthermore, it is possible to simply assemble the plated steel pipe and the metal fastener in a secure airtight manner.

Description

Plated steel pipe and metal fastener assembly and manufacturing method

The present invention relates to a plated steel pipe and a metal fastener assembly and a method for manufacturing the same, and more particularly, to install a metal fastener for pipe connection to a steel pipe for fluid pipes in which an antioxidant such as zinc is plated to prevent oxidation of the pipe. The present invention relates to a plated steel pipe and a metal fastener assembly and a method of manufacturing the metal fastener, which are easily assembled and manufactured in a plated steel pipe.

In general, pipes used for vehicles and various mechanical equipment, etc. are molded into various shapes according to the required conditions, and these pipes are manufactured by welding or fixing a fastening configuration for fastening with a counterpart at both ends thereof.

In this case, when the pipe used (hereinafter referred to as 'steel pipe') is a steel steel pipe, a steel pipe plated with an antioxidant such as zinc is mainly used to prevent corrosion (antioxidation). In other words, the fastening structure (ie, nuts or bolts for fastening) of the steel type is difficult to weld by galvanizing. Therefore, when using a galvanized steel pipe, a sleeve is assembled separately to fix the fastener. Is fixed so that it does not deviate.

However, the above method has a problem in that manufacturing time and cost increase because assembly of the nut or bolt to install the nut and the sleeve, and then install the sleeve, and then press the sleeve to the steel pipe to secure the sleeve. .

Therefore, there is a method of welding a nut or bolt using a general steel pipe without using a plated steel pipe, and then plating the whole steel plate.As a result, the professional plating of the general steel pipe requires not only expensive equipment. It takes a long time for plating and drying, and there is also a problem that it is difficult to secure the reliability of the plating, and as a result, there is a problem such that the steel pipe is easily corroded by poor plating.

In order to solve the above problems, the present applicant has been filed by applying a method for manufacturing a galvanized steel pipe for fluid pipe welded with steel fasteners (Registration No. 1571707).

The above patent document has the advantage that it can be fixed firmly by welding steel fasteners while using the existing galvanized steel pipe, thereby providing a highly reliable galvanized steel pipe.

However, the technique of the above patent document is a chemical treatment on the galvanized steel pipe to remove the part of the zinc plated, and also to insert the steel fasteners into the galvanized steel pipe, and then welded, again the steel fasteners and galvanized parts Many processes are required because zinc coating must be applied through spraying, which leads to low productivity and makes it difficult to mass-produce. Therefore, metal fasteners can be easily assembled and installed on galvanized steel pipes. There is a need for development of a technology that does not require a process after plating.

Therefore, the present invention has been made to solve the problem of welding and fixing the metal fastener to the plated steel pipe for the conventional fluid pipe as described above, the metal fastener is not welded to the plated steel pipe by welding to partially weld It is an object of the present invention to provide a plated steel pipe and a metal fastener assembly and a method of manufacturing the same, which do not need to remove the plating, and are simple to manufacture and assemble, yet easily maintain airtightness between the plated steel pipe and the metal fastening section.

An object of the present invention as described above is a plated steel pipe and the metal fastener assembly is a steel pipe formed with a fastening screw on the outer peripheral surface once the antioxidant is coated on the outer peripheral surface; Through-holes are formed to penetrate both sides, and one side is formed with a first screw thread connected to the connection pipe, and the other side is made of a metal fastener formed with a second screw thread screwed with a fastening screw, and a second screw thread of the metal fastener is formed. An O-ring installation groove is formed in which an O-ring is inserted and fixed, and a nut-shaped nut forming portion is formed on an outer circumferential surface of the metal fastener.

And the O-ring installation groove of the present invention is processed to have a diameter relatively larger than the diameter of the through-hole while having a diameter relatively smaller than the diameter of the outer circumferential surface on which the second screw thread is formed to form an O-ring installation groove from the through-hole A ring-shaped blocking protrusion formed to extend and protrude may be further formed.

In this case, the length of the blocking protrusion may be formed to be 2/3 to 4/5 of the thickness of the non-pressure state of the O-ring.

On the other hand, the manufacturing method of the present invention comprises a steel pipe thread forming step of forming a fastening screw by processing a male thread on one end of the galvanized steel pipe; A fastener manufacturing step of manufacturing a metal fastener having a screw thread coupled to the connection pipe while being coupled to the fastening screw of the steel pipe, and then galvanizing; A drying step of drying the galvanized metal fasteners; O-ring installation step of inserting and fixing the O-ring inside the dried metal fastener; It is achieved by consisting of an assembly step of assembling by screwing the metal fastener is installed O-ring to the fastening screw.

And the fastener manufacturing step of the present invention is to prepare a cylindrical material, the outer surface processing step for processing the outer shape to have a different diameter in accordance with the dimensions; A through-hole forming step of forming a through-hole to penetrate the inside of the outer processed material; A first screw thread processing step of machining the first screw thread along an outer circumferential surface of one side end of the material in which the through hole is formed; A second screw thread processing step of processing a second screw thread along the inner circumferential surface of the through hole at the other end of the material; The second screw thread may be formed by a zinc plating step of galvanizing the outer circumferential surface of the material.

In addition, an O-ring installation groove processing step of forming an O-ring installation groove into which the O-ring is inserted into the through hole may be further included between the first screw thread processing step) and the second screw thread processing step of the present invention.

In addition, in the O-ring installation groove processing step of the present invention has a diameter relatively larger than the diameter of the through hole, the O-ring installation groove is formed by being processed to have a diameter relatively smaller than the diameter of the outer peripheral surface of the other end of the material It may be practiced to form a ring-shaped blocking protrusion extending from the ball protruding.

On the other hand, between the second screw thread processing step and the zinc plating step of the present invention may further include a taper processing step to form a tapered portion by inclining the inner peripheral surface of the through-hole in the direction in which the first screw thread is formed at a predetermined angle.

The plated steel pipe and the metal fastener manufactured by the manufacturing method of the plated steel pipe and the metal fastener assembly according to the present invention are firmly fastened and fixed to each other by the O-ring installed in the O-ring installation groove while the tip of the plated steel pipe is in close contact with the blocking protrusion. Confidentiality is ensured because the confidentiality is maintained in a double structure.

In addition, the present invention can be used as it is without the chemical treatment of the commercial steel pipe plated with antioxidants separately, the mass production of metal fasteners, and then plated at a time to produce a large amount, so that the productivity is improved have.

In addition, deterioration due to welding heat and poor welding are fundamentally prevented because the welded steel pipe and the metal fastener are not welded.

1 is a process flow chart showing a method of manufacturing a plated steel pipe and a metal fastener assembly of the present invention;

2 is a process flow chart showing an example of a fastener manufacturing step of the present invention,

3 is a cross-sectional perspective view showing an example in which the steel pipe and the metal fastener of the present invention are combined;

4 is a perspective view of a steel pipe and a metal fastener separated from the present invention;

5 is a cross-sectional view showing an example in which the steel pipe and the metal fastener of the present invention are combined;

6 is a cross-sectional view showing an example of the metal fastener of the present invention.

Hereinafter will be described in more detail with reference to the accompanying drawings showing a preferred embodiment of the present invention.

The present invention does not fix the metal fastener to the plated steel pipe by welding, there is no need to remove the plating partly for welding, plated steel pipe that can easily maintain the airtight between the plated steel pipe and the metal fastener, while manufacturing and assembly is simple; Metal fastener assembly and a method for manufacturing the same, for this purpose, the manufacturing method of the present invention as shown in Figure 1 steel pipe thread forming step (S100), fastener manufacturing step (S200), drying step (S400), O-ring installation It consists of a step (S500) and an assembly step (S600), hereinafter will be described according to this process.

(1) steel pipe thread forming step (S100)

This step is to prepare a galvanized steel pipe (hereinafter referred to as 'steel pipe 10') that is commercially galvanized on the outer surface, and then bent to the shape of the required product and at the same time as described in Figure 3 and 4 at the tip In order to form the fastening screw 11 by processing the male screw thread for joining the metal fastener 20, in this process, since the zinc plating of the thread portion is removed by cutting in the process of forming the fastening screw 11 in the present invention When the fastening screw 11 is formed, it is preferable to be precisely processed to be cut to fit with the size of the metal fastener 20, and, thereby, after the metal fastener 20 is fastened to the tip of the steel pipe 10, There is no remaining threaded portion of the fastening screw 11 exposed to the outside is precisely coupled.

(2) fastener manufacturing step (S200)

In this step, after the fastening screw 11 is formed in the steel pipe 10, as shown in FIG. 5, one connection screw 1 is coupled to the other end while being screwed to the fastening screw 11 of the steel pipe 10. In order to manufacture the metal fastener 20, the present invention for preparing the cylindrical material as shown in Figure 2, and then the outer surface processing step for processing the outer shape to have a different diameter in accordance with the dimensions (S210) ), A through-hole forming step (S220) for forming the through-holes 21 so as to pass through the inside of the externally processed material, and the first screw thread 22 along the outer circumferential surface of one side end of the material in which the through-holes 21 are formed. The first screw thread processing step (S230) to be processed, and the second screw thread processing step (S240) and the second screw thread 23 to process the second screw thread 23 along the inner circumferential surface of the through hole 21 at the other end of the material. The galvanizing step (S250) of galvanizing the outer peripheral surface of the formed material.

In this case, a nut-shaped portion 20A having a hexagonal nut shape is formed on the outer circumferential surface of the material, and when coupled to the connecting pipe 1 or the like by such a shape, a metal fastening assembled to the steel pipe 10 using a tool such as a spanner. The sphere 20 can be more firmly coupled to the connector 1.

And an O-ring installation groove forming an O-ring installation groove 24 into which an O-ring (O) is inserted into the through hole 21 between the first thread processing step S230 and the second thread processing step S240. Machining step (S235) is included, wherein the O-ring installation groove 24 has a diameter relatively larger than the diameter of the through-hole 21, as shown in Figure 6 and has a diameter relatively smaller than the diameter of the outer peripheral surface of the other end of the material The O-ring installation groove 24 is formed by being processed to have a ring-shaped blocking protrusion 24A extending from the through hole 21 and protruding.

Furthermore, the length L of the blocking protrusion 24A is 2/3 to 4/5 of the thickness D of the pressureless state of the O-ring O, which is the thickness of the pressureless state of the O-ring O ( D) When the length L of the blocking protrusion 24A is greater than 4/5, the tip of the steel pipe 10 is blocked before the steel pipe 10 is sufficiently fastened and the O-ring O is tightly adhered. While the sealing function by the O-ring (O) is not properly expressed while being in close contact with the 24A), the length (L) of the blocking protrusion (24A) is 2 / compared to the thickness (D) in the pressureless state of the O-ring (O). If less than 3, the tip of the blocking protrusion (24A) and the steel pipe (10) is not in close contact with the gap is formed as the fluid flows into the O-ring installation groove 24, so the function of the double sealing is relatively weakened in the present invention The length (L) of the blocking protrusion (24A) compared to the thickness (D) of the pressureless state of the O-ring (O) so that the sealing function can be expressed by the blocking protrusion (24A) and the O-ring (O) in double. Formed to be 3 to 4/5 It is desirable to be.

Meanwhile, a taper portion A is formed between the second screw thread processing step S240 and the zinc plating step S250 by inclining the inner circumferential surface of the through hole 21 in the direction in which the first screw thread 22 is formed at a predetermined angle. Tapered machining step (S245) to be further included, such that the taper portion (A) through the connection pipe 1 through the metal fastener 20, the flow rate of the fluid through the steel pipe 10 more quickly It flows through the internal flow path of.

(3) drying step (S400)

After the metal fastener 20 is manufactured from above, this step is to dry naturally at room temperature or rapidly dry using a drying apparatus so that zinc plating of the manufactured metal fastener 20 can be sufficiently dried. When drying using the apparatus, it is preferable that the galvanized portion and the metal fasteners are dried at low temperature so that thermal deformation does not occur.

(4) O-ring installation step (S500)

This step is to insert and fix the O-ring (O) inside the dried metal fastener 20, the O-ring (O) in the O-ring installation groove 24 formed inside the metal fastener 20 If the pin is inserted correctly, the O-ring (O) is locked by the second screw thread 23, and the O-ring (O) is not easily removed from the O-ring installation groove 24 of the metal fastener 20 even during movement and vibration. The installed state remains unchanged.

(5) Assembly step (S600)

This step is to fasten the steel pipe 10 and the metal fastener 20, respectively manufactured from the above, in the present invention, the fastening screw 11 of the steel pipe 10 to the second screw thread 23 of the metal fastener 20 O-ring installed in the O-ring installation groove 24 in this process is assembled so that the front end of the steel pipe 10 is in close contact with the blocking projection (24A) formed to protrude in the inner side of the metal fastener (20). O) is sufficiently compressed in the O-ring installation groove 24 to form a double sealing structure of the blocking protrusion 24A and the O-ring (O), as a result of the fluid is a steel pipe 10 and the metal fastener 20 Is effectively prevented from leaking to the outside through threads fastened to each other.

The plated steel pipe and the metal fastener assembly manufactured by the method as described above are coated with an antioxidant on the outer circumferential surface thereof, as shown in FIGS. 3 to 4, and the steel pipe 10 having the fastening screw 11 formed on the outer circumferential surface thereof, and both side surfaces thereof. The through-hole 21 penetrates through the first screw thread 21 is formed on one side is connected to the connecting pipe, the second screw thread 23 is screwed with the fastening screw 11 on the other side is formed metal It consists of a fastener 20, in which the second ring thread 23 of the metal fastener 20 is formed inside the O-ring (O) is inserted into the O-ring mounting groove 24 is fixed, the metal fastening A nut-shaped nut forming portion 20A is formed on the outer circumferential surface of the sphere 20.

On the other hand, the steel pipe is used as a commercial product plated with an antioxidant such as zinc, the metal fastener 20 is made of various metal materials such as steel, brass.

In addition, the O-ring installation groove 24 of the metal fastener 20 has a diameter relatively larger than the diameter of the through hole 21 as described above, and is relatively larger than the diameter of the outer circumferential surface on which the second screw thread 23 is formed. The O-ring installation groove 24 is formed by being processed to have a small diameter, and at the same time, a ring-shaped blocking protrusion 24A is formed to extend and protrude from the through hole 21, thereby separately blocking protrusion 24A. It does not need to be processed separately to form a.

Furthermore, the present invention is a steel pipe that is assembled by being formed so that the length (L) of the blocking protrusion (24A) is 2/3 to 4/5 of the thickness (D) of the pressureless state of the O-ring (O) as shown in FIG. The tip of 10) is formed with a gap with the blocking protrusion 24A, or the O-ring O is not sufficiently compressed by the blocking protrusion 24A, and both components are assembled in close contact with each other. While maintaining the double airtight by the configuration, the fluid flowing through the steel pipe 10 does not leak through the fastening portion between the steel pipe 10 and the metal fastener 20 to the outside.

As described above, the plated steel pipe and the metal fastener assembly manufactured by the method for manufacturing the plated steel pipe and the metal fastener assembly may be firmly fastened to each other while the plated steel pipe and the metal fastener may be tightly coupled to each other. The O-ring installed in the O-ring installation groove maintains hermeticity in a double structure to further ensure hermeticity, and facilitates the manufacture of plated steel pipes and metal fasteners, enabling mass production and significantly reducing production costs.

Claims

Steel pipe 10 and the fastening screw 11 is formed on the outer peripheral surface once the antioxidant is coated on the outer peripheral surface;

Through-holes 21 are formed to penetrate both sides, and one side is formed with a first screw thread 21 connected to the connection pipe, and the other side is formed with a second screw thread 23 screwed with the fastening screw 11. Made of metal fastener 20,

An O-ring installation groove 24 to which an O-ring (O) is inserted and fixed is formed at an inner side in which the second screw thread 23 of the metal fastener 20 is formed, and on an outer circumferential surface of the metal fastener 20. Plated steel pipe and metal fastener assembly, characterized in that the nut-shaped nut forming portion (20A) is formed.
The method according to claim 1,

The O-ring installation groove 24 is processed to have a diameter relatively larger than the diameter of the through hole 21 and to have a diameter relatively smaller than the diameter of the outer circumferential surface on which the second screw thread 23 is formed. Plated steel pipe and metal fastener assembly, characterized in that the installation groove 24 is formed and the ring-shaped blocking projection (24A) is formed to extend and protrude from the through hole (21) at the same time.
The method according to claim 2,

The length L of the blocking protrusion 24A is formed to be 2/3 to 4/5 of the thickness D of the pressureless state of the O-ring O, and the metal fastener assembly is characterized in that it is formed. .
Steel pipe thread forming step (S100) of forming a fastening screw 11 by processing a male thread on one end of the galvanized steel pipe 10;

A fastener manufacturing step (S200) of manufacturing a metal fastener 20 having a screw thread coupled to the connection pipe while being coupled to the fastening screw 11 of the steel pipe 10, and galvanizing;

A drying step (S400) of drying the zinc plated metal fasteners 20;

An O-ring installation step (S500) for inserting and fixing an O-ring (O) inside the dried metal fastener 20;

The method of manufacturing a plated steel pipe and metal fastener assembly, characterized in that the O-ring (O) is provided with an assembling step (S600) of assembling the metal fastener (20) with the fastening screw (11).
The method according to claim 4,

The fastener manufacturing step (S200) is to prepare a cylindrical material, the outer surface processing step (S210) for processing the outer shape to have a different diameter in accordance with the dimensions;

A through-hole forming step (S220) for forming a through-hole 21 so as to pass through the inside of the externally processed material;

A first screw thread processing step (S230) of processing the first screw thread 22 along an outer circumferential surface of one side end of the material in which the through hole 21 is formed;

A second screw thread processing step (S240) of processing the second screw thread 23 along the inner circumferential surface of the through hole 21 at the other end of the material;

Method of manufacturing a plated steel pipe and metal fastener assembly, characterized in that the galvanizing step (S250) for galvanizing the outer circumferential surface of the material on which the second screw thread 23 is formed.
The method according to claim 5,

An O-ring forming an O-ring installation groove 24 into which the O-ring (O) is inserted into the through hole 21 between the first screw thread processing step (S230) and the second screw thread processing step (S240). Installation groove processing step (S235) characterized in that it further comprises a method of manufacturing a plated steel pipe and metal fastener assembly.
The method according to claim 6,

In the O-ring installation groove processing step (S235) has a diameter relatively larger than the diameter of the through hole 21, the O-ring installation groove by being processed to have a diameter relatively smaller than the diameter of the outer peripheral surface of the other end of the material. A method of manufacturing a plated steel pipe and metal fastener assembly, characterized in that (24) is formed and a ring-shaped blocking protrusion (24A) extending from the through hole (21) is formed to protrude.
The method according to claim 7,

The length L of the blocking protrusion 24A is formed to be 2/3 to 4/5 of the thickness D of the pressureless state of the O-ring O, and the metal fastener assembly is characterized in that it is formed. Manufacturing method.
The method according to claim 5,

Between the second screw thread processing step S240 and the zinc plating step S250, the inner peripheral surface of the through hole 21 in the direction in which the first screw thread 22 is formed is inclined at a predetermined angle to taper portion A. Method of manufacturing a plated steel pipe and metal fastener assembly characterized in that it further comprises a taper processing step (S245) to form.