KR102507258B1 - Manufacturing method of metal lock sleeve using the shaping method and lock sleeve manufactured by the same - Google Patents

Abstract

One embodiment of the present invention provides a manufacturing method of a metal lock sleeve using a shaping method. A manufacturing method of a metal lock sleeve using a shaping method according to an embodiment of the present invention includes the steps of: preparing a hollow round rod of a certain length from a metal round rod; fitting and fixing the hollow round rod to a central fitting part of a base mold; surrounding the hollow round rod in the base mold with a plurality of side molds; and pressing and shaping the hollow round rod with a pressure mold positioned above the side molds.

Description

Method for manufacturing a metal lock sleeve using a shaping method and a lock sleeve manufactured thereby

The present invention relates to a method for manufacturing a metal lock sleeve using a shaping method, and more particularly, to a method for manufacturing a metal lock sleeve using a shaping method for manufacturing a lock sleeve used for connecting refrigerant tubes.

Refrigerants charged at high pressure are used in household, industrial, commercial, and vehicle air conditioners, air conditioning systems (air conditioners), and household, industrial, and commercial refrigeration/freezing systems (refrigerators, freezers, water purifiers, cold/hot water dispensers, etc.).

A pipe forming a flow path for such a refrigerant needs to be firmly sealed at its connection seam, and a sealed sleeve is used as a part for sealing connection of the refrigerant line.

In the sealed sleeve, not only the fastening mechanism for connecting the two tubes, but also its material and manufacturing process are important. In terms of materials, corrosion resistance, chemical resistance, stiffness, ductility, surface strength, etc. are required. In addition, in terms of the manufacturing process, high dimensional accuracy, internal roughness management, and internal diameter shape (curved, straight, tapered) management, etc. are required in processing the inner diameter portion (fastening portion) of the sealed sleeve.

Existing sealed sleeves have a columnar body having a central axis of the main body, a pressing part formed on the main body with the central axis of the main body as a central axis, and applying sealing pressure to the insertion and coupling part, and an inlet as an opening for the second tube in the installed state. , and a through hole having an exit portion (fastening portion) as an opening for the first tube. The pressing portion is formed on a part of the inner wall of the through hole, and the inner diameter of the pressing portion as the inner diameter of the pressing portion is smaller than the second outer diameter or the first outer diameter.

Such a conventional hermetic sleeve is a preparation step of preparing a metal powder containing iron and a molding lubricant, a molding step of charging the metal powder into a mold and applying pressure to form a green compact, and a green compact A sintering step of forming a sintered body by sintering, a shaping step of forming a predetermined curvature with respect to the inner diameter of the housing by applying pressure to the inside of the sintered body, and manufacturing a shaped body, Resin impregnating the shaped body with resin to seal the micropores of the shaped body It is manufactured through an impregnation step, and a plating step of completing a sealed sleeve by performing plating on the molded body that has been impregnated with resin.

However, the conventional method of manufacturing an airtight sleeve is formed by shaping and resin impregnation after molding and sintering, and the manufacturing process is complicated compared to the use mainly used as a joint of a refrigerant line, and the efficiency of mass production and manufacturing economy are not high. did not

KR10-1682703 KR10-1684858

An object of the present invention to solve the above problems is to provide a method for manufacturing a metal lock sleeve using a shaping method that is simple to manufacture and has high mass production efficiency and manufacturing economy, and a lock sleeve manufactured thereby.

The technical problem to be achieved by the present invention is not limited to the above-mentioned technical problem, and other technical problems not mentioned can be clearly understood by those skilled in the art from the description below. There will be.

Configuration of the present invention for achieving the above object, providing a hollow round bar of a predetermined length in the metal round bar; inserting and fixing the hollow round bar to a base mold; enclosing the hollow round bar fixed to the base mold with a plurality of side molds; and shaping the hollow round rod surrounded by the plurality of side molds with a pressurizing mold located above the plurality of side molds.

In one embodiment of the present invention, the base mold may be formed such that a central fitting portion protrudes upward, and the hollow round rod may be inserted into the central fitting portion to deform its internal shape.

In one embodiment of the present invention, the central fitting portion is formed in a concave curved horn shape with a diameter gradually decreasing from the bottom to the top, and the cross-sectional shape of the outer peripheral surface is an arc shape, a curved surface or a taper, and other shapes. .

In one embodiment of the present invention, the inner circumferential surface of the hollow round bar may be formed in a curved circular arc shape to be the same as the outer circumferential shape of the central fitting portion.

In one embodiment of the present invention, an annular step may be formed on an inner surface of the side mold to form a boundary step on the hollow round bar after the shaping step by the pressure mold.

In one embodiment of the present invention, the hollow round bar may be formed to have a lower diameter than the upper part based on the boundary step.

In one embodiment of the present invention, a mounting groove may be formed in the base mold so that the side mold is positioned and fixed.

In one embodiment of the present invention, the plurality of side molds are composed of a first side mold that directly contacts the hollow round bar and a second side mold that surrounds and fixes outer surfaces of the first side mold and the base mold. can

In one embodiment of the present invention, the step of shaping the hollow round bar may further include heating the hollow round bar to a preset temperature.

In one embodiment of the present invention, after the shaping step of the hollow round bar, the step of separating the hollow round bar from the central fitting part is further included, but the hollow round bar shaped by the take-out mechanism integrally installed in the base mold can be separated.

In one embodiment of the present invention, the central fitting part coupled to the base mold may be formed to be replaceable.

In one embodiment of the present invention, the central fitting part coupled to the base mold may be formed to adjust the height.

In one embodiment of the present invention, the pressing mold may have a pressing portion protruding downward and a circular protrusion protruding from a lower surface of the pressing portion.

In one embodiment of the present invention, the diameter of the pressing portion may be formed to correspond to the diameter of the hollow round bar.

In one embodiment of the present invention, the diameter of the circular protrusion is formed to correspond to the inner circumferential surface of the hollow round bar, so that when the pressing mold is pressed, the circular protrusion is fitted into the hollow round bar to align the pressing part and the hollow round bar. can make it

In one embodiment of the present invention, the hollow round bar may include one or more selected from among iron, aluminum, copper, zinc, and lead.

According to another configuration of the present invention, a lock sleeve manufactured by the method of manufacturing a metal lock sleeve using the above-described shaping method may be provided.

The effects of the present invention according to the configuration as described above can provide a method for manufacturing a metal lock sleeve using a shaping method that is simple in manufacturing and production, and has high efficiency in mass production and high manufacturing economy, and a lock sleeve manufactured thereby.

The effects of the present invention are not limited to the above effects, and should be understood to include all effects that can be inferred from the detailed description of the present invention or the configuration of the invention described in the claims.

1 is a conceptual diagram of a method for manufacturing a metal rock sleeve using a shaping method according to an embodiment of the present invention.
Figure 2 is an assembly view of the lock sleeve orthopedic manufacturing mold of Figure 1.
FIG. 3 is a schematic state diagram of the pressing unit of FIG. 2 .
4 is a conceptual diagram showing the extraction of the lock sleeve in FIG. 3;
FIG. 5 is a conceptual diagram showing a height adjusting means for a central fitting part in the base mold of FIG. 2 .
Figure 6 is a conceptual diagram showing a horizontal and vertical conversion unit used in the lock sleeve mold manufacturing mold of FIG.

Hereinafter, the present invention will be described with reference to the accompanying drawings. However, the present invention can be implemented in many different forms, and therefore is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

Throughout the specification, when a part is said to be "connected (connected, contacted, combined)" with another part, this is not only "directly connected", but also "indirectly connected" with another member in between. "Including cases where In addition, when a part "includes" a certain component, it means that it may further include other components without excluding other components unless otherwise stated.

Terms used in this specification are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, terms such as "include" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that the presence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a conceptual diagram of a method for manufacturing a metal lock sleeve using a shaping method according to an embodiment of the present invention, FIG. 2 is an assembly view of a lock sleeve orthopedic manufacturing mold of FIG. 1, and FIG. 3 is a shaping of the pressing part of FIG. 2 It is a state diagram.

1 to 3, a method for manufacturing a metal lock sleeve using a shaping method according to an embodiment of the present invention includes the steps of preparing a hollow round bar 10 of a preset length from a metal round bar (a), a hollow round bar Step (b) of inserting and fixing the round bar 10 into the base mold 100, step (c) of surrounding the hollow round bar 10 fixed to the base mold 100 with a plurality of side molds 110, and A step (d) of shaping by pressing the hollow round bar 10 surrounded by the plurality of side molds 110 with the press mold 120 positioned above the mold 110 is included.

First, a hollow round bar 10 for shaping may be provided by forming a hole in the center of a long straight metal round bar and cutting the same to a preset length. At this time, the hollow round bar 10 is prepared by processing a straight metal round bar by drawing to form a hollow in the center, and then cutting it to a preset length. Alternatively, the hollow round bar 10 having a hollow in the central portion may be prepared by machining the center portion of a straight metal round bar cut to a predetermined length.

According to this embodiment, after inserting the hollow round bar 10 of metal material into the base mold 100, surrounding it with a plurality of side molds 110, and then pressing it with the pressure mold 120, having different diameters and male and female coupling The lock sleeve 20 used to connect the refrigerant tubes can be manufactured.

The lock sleeve 20 is used as a joint and a joint mechanism that easily compresses and connects the extended connection parts of the refrigerant tubes in a state in which the refrigerant tubes are inserted and connected to each other in a male and female structure.

In the base mold 100, a central fitting portion 101 for forming an inner circumferential surface 11 extending from the bottom to the top of the hollow round bar 10 is formed to protrude upward.

The central fitting portion 101 is formed in a concave curved horn shape with a diameter gradually decreasing from the bottom to the top, and the cross-sectional shape of the outer circumferential surface is made of a curved surface or taper and other shapes in an arc shape.

Accordingly, the inner circumferential surface 11 of the hollow round bar 10 is formed in a curved circular arc shape to be the same as the outer circumferential shape of the central fitting portion 101 .

That is, the central fitting part 101 of the base mold 100 has a cone shape in which the side part is concavely curved corresponding to the hollow structure of the hollow round bar 10, and is formed curved from the bottom to the top of the hollow round bar 10. It forms the inner circumferential surface 11 of a curved surface or taper and other shapes. The shape of the inner circumferential surface 11 of such a curved surface or taper or other shape may be slightly changed according to the degree of curvature and inclination of the tapered curved arc shape of the central fitting part 101 .

The central fitting part 101 presses the inner circumferential surface 11 of the hollow round bar 10 in a state of being inserted into the hollow round bar 10, and forms a shape corresponding to the outer circumferential surface on the hollow round bar 10. At this time, the inner diameter from the top to the bottom of the hollow round bar 10 may be curved or taper and other shapes between 5mm and 12mm.

The plurality of side molds 110 include a first side mold 111 provided with an annular step 115, and a second side mold 112 surrounding the base mold 100 and the first side mold 112. can do.

In this embodiment, the mounting groove 102 is formed in the base mold 100 so that the first side mold 111 is inserted into the base mold 100 and fixed in position.

An annular step 115 is formed on the inner surface of the first side mold 111 of the side mold 110 to form a boundary step 15 on the hollow round bar 10 after the shaping step by the pressure mold 120. .

In this way, the first side mold 111 of the side mold 110 is provided with an annular step 115 at the inner center so as to form a smaller aperture at the bottom than the top, and also the opening 116 for shaping the press mold 120 is provided

The annular step 115 in the first side mold 111 of the side mold 110 forms a boundary step 15 on the lock sleeve 20 so that the lower part of the hollow round rod 10 has a smaller diameter than the upper part. do. The boundary step 15 of the lock sleeve 20 may have an outwardly inclined or concave shape or, conversely, a protruding shape.

As described above, the first side mold 111 of the side mold 110 has an upper space larger than the lower space, and an annular step 115 along the circumferential direction is formed on the lower inner wall, and the hollow round bar 10 When the pressing unit 121 is pressed and transformed into the lock sleeve 20, a boundary step 15 corresponding to the annular step 115 is formed while making the lower part of the hollow round bar 10 smaller in diameter than the upper part. will do

The boundary step 15 formed on the outer circumferential surface of the lock sleeve 20 provides a structure in which the lock sleeve 20 can be caught and engaged with a compression mechanism used for connecting the refrigerant tube.

The second side mold 112 is installed on the base block 100 so that the base mold 100 and the first side mold 111 are placed and fixed in position, and in the shaping step by the press mold 120, the base mold ( 100) to firmly fix the first side mold 111 on the top to make a smooth shaping step proceed.

The base mold 100 and the first side mold 111 are subjected to considerable pressure when the hollow round bar 10 is pressed by the pressure mold 120, but the first side mold 111 is the base mold 100 Since it is inserted into the mounting groove 102, it can be firmly fixed in position during the shaping process by the pressing part 121.

In addition, since the second side mold 112 surrounds the side mold 110, the internal processing shape by the plurality of pieces of the first side mold 111 may be maintained. The first side mold 111 may be provided in a pair of left and right or 3 to 5 pieces and installed in the base mold 100 .

A pressing portion 121 protruding downward is formed in the pressing mold 120 , and a circular protrusion 125 inserted into the hollow round bar 10 is formed in the pressing portion 121 .

The diameter of the pressing portion 121 is formed to correspond to the diameter of the hollow round bar 10, and the circular protrusion 125 is provided to be easily inserted into the upper inner circumferential surface 11 of the hollow round bar 10.

The diameter of the circular protrusion 125 is formed to correspond to the inner circumferential surface of the hollow round bar 10, so that when the pressurizing mold 120 is pressed, the circular protrusion 125 is fitted into the hollow round bar 10, and the pressing part 121 and the hollow round bar Sort (10).

Moreover, in the forming process in which the hollow round bar 10 is transformed into the lock sleeve 20 by the side mold 110 on the base mold 100, the upper inner circumferential surface 11 of the hollow round bar 10 is formed by the circular protrusion 125. ) is sufficiently supported so that the position of the pressing part 121 is firmly fixed in the hollow round bar 10, and the shape of the upper tube diameter can be kept constant.

A pressing operation unit capable of providing a linear drive, such as a hydraulic cylinder providing a pressing force, may be installed in the pressing mold 120 . This pressing operation unit serves to move the pressing mold 120 to the side mold 110 side.

Meanwhile, prior to the shaping step (d) of the hollow round bar 10, a step of preparing the hollow round bar 10 and heating it to a preset temperature may be performed. As such, the hollow round bar 10 may be easily deformed to correspond to the internal shapes of the base mold 100 and the side mold 110 by heating in advance by electric or gas heaters or induction heating of an electric coil prior to shaping.

For example, the hollow round bar 10 is heated by an induction coil movably installed so as to surround the hollow round bar 10 while being fitted into the central fitting part 101 of the base mold 100, or Before being inserted into the fitting part 101, it can be heated while passing through a heater installed on a path transported to the center fitting part 101 side.

4 is a conceptual diagram showing the extraction of the lock sleeve in FIG.

Referring to FIG. 4, after the shaping step (d) of the hollow round bar 10, the hollow round bar 10 provided in the base mold 100 and shaped is taken out, but from the base mold 100, the second side mold 112 ) and separating the first side mold 111 into both sides, the hollow round bar 10 can be separated from the central fitting part 101.

After the hollow round bar 10 is shaped into the shape of the lock sleeve 20, it can be taken out to the outside by the take-out mechanism 140 integrally installed in the base mold 100. Such a take-out mechanism 140 may be provided with a take-out rod 141 and a take-out operation unit 142 movably installed in the base mold 100 .

One or more pairs of take-out rods 141 may be installed in the base mold 100 to push the bottom portion of the hollow round bar 10 or the boundary step 15 .

On the other hand, as another embodiment, the take-out mechanism 140 may be implemented as a plurality of take-out rods installed around the central fitting part 101 on the upper surface of the base mold 100 to retract and protrude elastically by a spring. A plurality of take-out rods are supported by springs and inserted into the base mold 100 to be installed.

This take-out rod is pressed by the hollow round bar 10 on the upper surface of the base mold 100 and enters the inside of the base mold 100, and then, on the contrary, when the pressing part 121 moves, the shaped lock sleeve 20 It can be pushed by a spring force so that it is separated from the central fitting part 101 and the side mold 110.

Meanwhile, in another embodiment, the first side mold 111 may be provided in a plurality of pieces, and at least one of relative rotation and movement may be installed in the base mold 100 .

That is, since the first side mold 111 is installed to be separated from the base mold 100 on both sides, the hollow round bar 10 formed in the first side mold 111 can be easily separated from the base mold 100 and the first side mold. (111) can be isolated to the outside. This may be adopted when the base mold 100 is vertically disposed and the hollow round bar is horizontally disposed and the shaping step proceeds in a state where the first side mold 111 is horizontally disposed.

FIG. 5 is a conceptual diagram showing a height adjusting means for a central fitting part in the base mold of FIG. 2 .

Referring to FIG. 5, by installing a height adjusting means 106 such as an adjusting screw in the base mold 100 and movably configuring the central fitting part 101 on the top of the base mold 100, the base mold 100 ), the central fitting part 101 can be installed to be height-adjustable. Accordingly, the depth of the tapered inner circumferential surface 11 formed on the hollow round bar 10 by the central fitting part 101 can be adjusted.

That is, when the height of the central fitting portion 101 is reduced, the depth of the tapered inner circumferential surface 11 is formed low in the hollow round bar 10, and when the height of the central fitting portion 101 is increased, the tapered in the hollow round bar 10 The depth of the inner circumferential surface 11 may be formed higher.

In addition, the central fitting part 101 can be replaced on the base mold 100 by being coupled to the base mold 100 with a height adjusting means 106 such as an adjusting screw, and is provided in a replaceable shape on the base mold 100. It can be.

6 is a conceptual diagram showing a horizontal and vertical conversion unit implemented by an electric motor as a different embodiment from the hydraulic cylinder of the pressing operation unit for pressurizing the pressurizing mold of the lock sleeve orthopedic mold of FIG. 2 .

Referring to FIG. 6, in a state where the base mold 100 and the side mold 110 are vertically arranged, the hollow round bar 10 is vertically disposed in the central fitting part 101, and the pressing part of the pressurizing mold 120 The shaping step is performed by moving the 121 vertically, and a horizontal and vertical conversion unit 150 for converting horizontal pressure into vertical pressure may be installed on the pressing unit 121 .

The horizontal and vertical conversion unit 150 may be provided with a worm gear 151, a worm wheel 152, a lead screw 153 screwed to the pressing unit 121, and a driving motor 154 for driving them. . As the drive motor 154 is driven, the worm wheel 152 rotates while the worm gear 151 disposed horizontally rotates, and the lead screw 153 coupled to the worm wheel 152 may rotate. The pressing unit 121 can be moved up and down by the rotation of the lead screw 153, and a shaping step is performed while moving down.

As such, the horizontal and vertical conversion unit 150 is composed of a combination of the worm gear 151, the worm wheel 152, and the lead screw 153, so that the moving distance of the pressing unit 121 is accurately adjusted, and the hollow of the pressing unit 121 After round bar forming, in-situ operation is easily performed. The combination of the worm gear 151 and the worm wheel 152 can expect a sufficient increase in torque for shaping the pressing part 121 .

In addition, as another embodiment of the pressing operation unit, the upper surface of the pressing mold 120 has an inclined structure so that the horizontal and vertical conversion units are in contact with each other, and when the horizontal and vertical conversion units are horizontally moved, the press mold 120 A pressure operation unit that moves downward may be provided. At this time, the pressure mold 120 may be returned to its original position by a spring, and a hydraulic cylinder providing hydraulic pressure may be connected to the horizontal and vertical converters.

The aforementioned horizontal and vertical conversion units reduce the manufacturing space for shaping the hollow round bar, even when the base mold 100 and the side mold 110 are horizontally arranged and the hollow round bar 10 is horizontally arranged. enough to use

On the other hand, the hollow round rod 10 is one or more of iron, aluminum, copper, zinc, and lead that can be easily compressed by being inserted into the refrigerant tubes to enable insert connection of refrigerant tubes having different diameters, that is, one end is expanded. It can be provided including.

For example, the hollow round bar 10 is made of aluminum or an aluminum alloy material, so that the lock sleeve 20 made of aluminum or an aluminum alloy material can be manufactured.

In addition, the hollow round rod 10 may use an inner peripheral surface 11 coated with a predetermined thickness of copper, zinc, lead, or the like. It is easily squeezed on the side of the joint of the refrigerant tube to prevent leakage from the joint of the refrigerant tube. Practically, a liquid resin that prevents leakage is used for the connection of the refrigerant tubes using the lock sleeve 20 . The liquid resin is applied to the joint before the lock sleeve 20 is pressed to the joint of the refrigerant tubes.

The above description of the present invention is for illustrative purposes, and those skilled in the art can understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, the embodiments described above should be understood as illustrative in all respects and not limiting. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present invention is indicated by the following claims, and all changes or modifications derived from the meaning and scope of the claims and equivalent concepts should be interpreted as being included in the scope of the present invention.

10: hollow round bar
11: Give me
15: boundary steps
20: lock sleeve
100: base mold
101: central fitting part
102: mounting groove
110: side mold
111: first side mold
112: second side mold
115: annular step
116: opening
120: pressure mold
121: pressing part
125: circular projection
140: take-out mechanism
150: horizontal and vertical conversion unit

Claims (17)

Preparing a hollow round bar of a predetermined length from a metal round bar;
inserting and fixing the hollow round bar into a base mold;
A plurality of side molds composed of a first side mold that directly contacts the hollow round bar fixed to the base mold and a second side mold that surrounds and fixes the outer surface of the first side mold and the base mold. enclosing; and
Forming by pressing the hollow round bar surrounded by the plurality of side molds with a press mold located on top of the plurality of side molds;
The base mold has a mounting groove for inserting and fixing the first side mold into the base mold, and the second side mold is installed to be coupled to the base mold, so that the first side mold is installed in the base mold. firmly fixed on the
The base mold is provided with a height adjusting means for adjusting the height of the central fitting part by moving the central fitting part in combination with the central fitting part,
Method for manufacturing a metal lock sleeve using a shaping method, characterized in that the shape of the tapered inner circumferential surface of the hollow round bar is adjusted by adjusting the height of the central fitting part by the height adjusting means.
According to claim 1,
The base mold is formed so that the central fitting part protrudes upward, and the hollow round bar is inserted into the central fitting part to deform the inner shape.
According to claim 2,
The central fitting part has a concavely curved horn shape whose diameter gradually decreases from the bottom to the top, and the cross-sectional shape of the outer circumferential surface is made of any one of a circular arc, a curved surface and a taper. manufacturing method.
According to claim 3,
The cross-sectional shape of the inner circumferential surface of the hollow round bar is a method of manufacturing a metal lock sleeve using a shaping method, characterized in that formed in a curved arc shape to correspond to the outer circumferential shape of the central fitting portion.
According to claim 1,
A method of manufacturing a metal lock sleeve using a shaping method, characterized in that an annular step is formed along the inner circumference of the side mold to form a boundary step on the hollow round rod after the shaping step by the pressure mold.
According to claim 5,
The hollow round bar is a method of manufacturing a metal lock sleeve using a shaping method, characterized in that the lower part is formed to have a smaller diameter than the upper part based on the boundary step.
According to claim 1,
Method for manufacturing a metal lock sleeve using a shaping method, characterized in that the base mold is formed with a mounting groove so that the side mold is positioned and fixed.
delete According to claim 1,
In the shaping step of the hollow round bar, the method of manufacturing a metal lock sleeve using a shaping method, characterized in that it further comprises the step of heating the hollow round bar to a preset temperature.
According to claim 2,
After the shaping step of the hollow round bar, a step of separating the hollow round bar from the central fitting part is further included, and the shaping method characterized in that the hollow round bar is separated by a take-out mechanism integrally installed in the base mold. Method for manufacturing a metal lock sleeve using
According to claim 2,
The method of manufacturing a metal lock sleeve using a shaping method, characterized in that the central fitting part coupled to the base mold is formed to be replaceable.
According to claim 2,
The method of manufacturing a metal lock sleeve using a shaping method, characterized in that the central fitting portion coupled to the base mold is formed to adjust the height.
According to claim 1,
The method of manufacturing a metal lock sleeve using a shaping method, characterized in that the pressing mold is formed with a pressing portion protruding toward the bottom and a circular protrusion protruding from the lower surface of the pressing portion.
According to claim 13,
The method of manufacturing a metal lock sleeve using a shaping method, characterized in that the diameter of the pressing portion is formed to correspond to the diameter of the hollow round bar.
According to claim 13,
The diameter of the circular protrusion is formed to correspond to the inner circumferential surface of the hollow round bar, and when the pressing mold is pressed, the circular protrusion is fitted into the hollow round bar to align the pressing part and the hollow round bar. Method for manufacturing a metal lock sleeve.
According to claim 1,
The hollow round bar is a method of manufacturing a metal lock sleeve using a shaping method, characterized in that made of a material containing at least one selected from iron, aluminum, copper, zinc, and lead.
delete

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