KR100343242B1 - Manufacturing method of a nipple for a flexible pipe and its apparatus - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for manufacturing a nipple for a flexible pipe, and more particularly, to cold forging both ends of a stainless pipe using a rotating molding forging machine to reduce the pipe to a uniform thickness. And cold forging is formed on the surface of the projections to improve the durability while improving the durability and the purpose to be used as a beverage pipe connector.

That is, according to the present invention, the gear 13a is formed on the outer circumference so that the rack gear 12a operated by the driving means 12 can be driven by the rack gear 12a on the base 11. The whole 13 is provided, and the two or more forging plates 14 are positioned inside the rotating body 13 so as to be elastically supported by the mutual springs 15, and the sliding protrusions 14a are disposed outside the forging plates 14. And a groove 13b corresponding to the sliding protrusion 14a is formed in the rotating body 13, and the guide hole 14b is formed on the lower surface of the forging plate 14 to protrude from the base 11. A forging machine (10) for forming a reduction tube to move along 11a),

Of the three forging rollers 21, 22 and 23 in which the groove 24 is formed, two forging rollers 21 and 22 are rotated on the rotating shaft 25, and one forging roller 23 is an operating means 26. And a step for forming the locking projections by which the forging rollers are collectively driven by providing a gearbox 27 so that the linear motion can be linearly moved by the three and the three forging rollers 21, 22, and 23 rotate in the same direction. The gist of the present invention is to form a reduction tube 4 on both sides of the central portion 3 of the stainless end pipe 2 by using the early 20, and to form a plurality of locking projections 4a on the outer surface of the reduction tube 4. have.

Description

Manufacturing method and apparatus of a nipple for a flexible pipe {Manufacturing method of a nipple for a flexible pipe and its apparatus}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for manufacturing a nipple for a flexible pipe, and more particularly, to cold forging both ends of a stainless pipe using a rotating molding forging machine to reduce the pipe to a uniform thickness. In addition, by forming the locking projections by cold forging on the surface thereof, the purpose of the present invention is to improve productivity while improving durability and to use it as a beverage tubing connector.

In general, the pipe connection nipple is widely used, and the situation is mainly made of brass.

In recent years, environmental problems are seriously discussed, and since the nipple made of brass contains a small amount of lead, it is urgent to replace the nipple used for connecting drinking water pipes. A method of chromium plating on the surface has been attempted, but the chromium is uniformly plated only on the outer surface of the nipple and the plating rate is low on the inner surface. Nipples that are constructed may be of interest in durability or other conditions, but due to difficulties in processing, until now, the nipples are not manufactured using stainless steel.

Meanwhile, the brass nipple as described above is also widely used to connect a flexible pipe (commonly referred to as an "Excel pipe"), which is widely used for piping, but in the case of the brass nipple, the thickness of the screw portion becomes thin during processing. When connecting the pipe to both sides, the stress of the connection part is weakened and damaged by the internal pressure, so that the reliability of the pipe is not only lowered but also the service life is very short.

Therefore, the present invention has been researched and developed to solve various problems of the nipple as described above, and cold forging both ends of the stainless pipe cut to a predetermined size to reduce the thickness to a uniform thickness and cold forging to form a plurality of locking projections on the surface thereof. In order to manufacture the nipple, it is possible to produce a large quantity of stainless steel nipple with good productivity and excellent durability at a low price, and also to supply drinking water to drink more safely by using the nipple for the flexible pipe. The present invention has been completed with technical problems.

1 is a perspective view showing one embodiment of a nipple completed by the present invention

2 is a cross-sectional view of FIG.

Figure 3 is a cross-sectional view showing another embodiment completed by the present invention

Figure 4 is a plan view of the forging plate for reducing tube forging machine for manufacturing the nipple of the present invention

Figure 5 is a plan view of the tube forging machine for manufacturing the nipple of the present invention before the forging plate is operated

6 is a cross-sectional configuration of FIG.

7 is a sectional view of the main portion of the reduced tube forging machine of the present invention

Figure 8 is a plan view of the forging machine forging the locking projection formed on the reduction tube of the present invention

9 is a front view of FIG. 8

10 is a cross-sectional view of one use state of the nipple manufactured by the present invention.

Explanation of symbols used in main part of drawing

1: nipple 2: short pipe

3: center 4: shrink tube

4a: jamming

10: forging machine for the reduction tube 11: gas

11a: guide hole 12: driving means

12a: rack gear 13: rotating body

13a: gear 14: forging plate

14a: sliding projection 14b: guide

15 spring 16: forming hole

20: forging machine for forming the locking projection 21,22,23: forging roller

24: groove 25: axis of rotation

26: operating means 27: gearbox

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

1 is a perspective view showing an embodiment of a nipple completed by the present invention, Figure 2 shows a cross-sectional view of FIG.

The nipple (1) to be provided in the present invention has a plurality of outer diameters to be smaller than the outer diameter of the short pipe (2) when forging both sides of the central portion (3) of the short pipe (2) cut stainless pipe to a predetermined length Cold forging with a forging consisting of two forging plates to form a reduction tube (4) on both sides of the center (3), the groove is formed therein so that a plurality of engaging projections (4a) is formed on the outer surface of the reduction tube (4) It is cold forged with a forging machine consisting of a plurality of forging plates. As described above, the nipple 1 of the present invention, which is cold forged, may provide convenience for use by forging the center portion 3 in a hexagon using another cold forging machine as necessary.

Fig. 3 is a cross-sectional view of the nipple of another embodiment manufactured by the present invention, and the nipple may be formed by using a “T” type or a “+”. In order to cold forge the nipple 1 as described above, a single pipe ( 2) forging machine for forming a reduction tube (10) to form a reduction tube (4) on both sides of the center (3), and a forging protrusion forming forging machine for forming a locking projection (4a) on the outer surface of the reduction tube ( A manufacturing apparatus consisting of 20) is required, and the configuration of each forging machine will be described below with reference to the accompanying drawings.

Figure 4 is a plan view of the forging machine for manufacturing the nipple of the present invention, Figure 5 is a cross-sectional view of the state before the forging plate of Figure 4 is operated, Figure 6 is a cross-sectional view showing the state the forging plate of Figure 4 is operated, Figure 7 Illustrates a cross-sectional view of the main portion of the present invention.

In order to manufacture the nipple (1) of the present invention as described above, first, forging the reduction tube (4) to both sides of the central portion (3) of the short pipe (2), forging for forming a reduction tube for forging (1) ) Is configured as follows.

That is, the forging machine 10 for forming a reduction tube of the present invention may be driven by the rack gear 12a on the base 11 on which the rack gear 12a operated by the driving means 12 is installed. The rotor 13 is formed on the outer circumference of the gear 13a is formed, and two or more forging plates 14 are installed inside the rotor 13 to be elastically supported by the mutual spring 15, A sliding protrusion 14a is formed on the outside of the forging plate 14, and a recess 13b is formed on the rotating body 13 to correspond to the sliding protrusion 14a. A guide hole 14b is formed on the bottom surface of the forging plate 14. Protruding to form a so that it can move along the guide hole (11a) provided in the base 11, the forging plate 14 is to be formed in a circular forming hole 16 on the inside when moving inward.

And Figure 7 is a plan view of the forging machine forging the locking projection formed in the reduction tube of the present invention, Figure 8 is a front view of Figure 7, the configuration thereof is as follows.

The locking projection forging machine 20 is fixed to rotate the two forging rollers (21, 22) of the three forging rollers (21, 22, 23) on which the projection (24) is formed on the rotating shaft (25), one The forging roller 23 of the gear box 27 so as to be able to linear movement by the operating means 26 consisting of a cylinder, etc., so that the three forging rollers (21, 22, 23) can rotate in the same direction ) Is configured to collectively drive the forging roller.

In the figure, reference numeral 28 is a motor that transmits power to the gearbox 27.

The nipple (1) of the present invention manufactured by the forging machine having the above configuration can be used as the nipple (1) mainly connecting the flexible pipe, the nipple manufacturing process of the present invention using the forging machine of the above configuration in detail It is as follows.

The rotating protrusion 13 is rotated forward by the driving means 12 of the forging machine 10 for reducing tube forming, and the sliding protrusion 14a formed on the outside of the forging plate 14 is recessed in the groove 13 of the rotating body 13. The forging plate 14 supported by the spring 15 while moving into 13b) is moved outward along the guide hole 11a of the base 11. At this time, one side end of the stainless end pipe (2) cut to the desired length in the forming hole (16) inside the forging plate (14) and when the rotating body 13 is rotated in the reverse direction the groove of the rotating body (13) ( The short pipe 2 in which the sliding protrusion 14a of the forging plate 14 embedded in 13b) gradually moves inward along the guide hole 11a while escaping the groove 13b. Will be squeezed outside.

In this case, the molding hole 16 is completely coupled to form a circular shape. At this time, one side of the short pipe 2 inserted into the molding hole 16 is reduced in and out diameter while maintaining the pipe shape. The reduction tube 4 is forged.

When one side of the end pipe 1 is formed as the reduction tube 4 and then the rotating body 13 is rotated forward, the sliding protrusion 14a of the forging plate 14 located inside the rotating body 13 is rotated. Since the forging plate 14 is elastically supported by the spring 15 and the inner diameter thereof is expanded, the other side of the short pipe 2 is placed in the molding hole 16 and rotated as described above. When the whole 13 is rotated reversely, the reduction tube 4 is simply cold forged on both sides of the end pipe 2.

On the other hand, in order to forge the engaging projection (4a) formed in the reduction tube 4, as shown in Figure 7, 8 between the two forging rollers (21, 22) of the fixed forging projection forming forging 20 Positioning the reduction tube 4 and pressing the variable forging roller 23 from the outer side of the reduction tube 4 and rotating the forging rollers 21, 22, 23, the plurality of locking projections in the reduction tube 4. (4b) is simply molded.

As described above, the flexible tube 6 is fitted to both side reduction tubes 4 of the nipple 1 of the present invention, which is forged and fixed, and the outside of the tube is fixed and fixed by the fixing means 7. The nipple (1) of the invention can be used for a long time without damaging the nipple (1) due to the pressure in the interior after installation, since the thickness of the center (3) or the reduction tube (4) is uniform, The flexible tube 6 fitted to the locking protrusion 4a formed in the fixing member 7 is fixed by the fixing means 7 and is firmly engaged with the locking protrusion 4a as shown in FIG. 10.

As described above, the present invention can produce a nipple 1 having a uniform thickness by forging a stainless steel tube by using a forging machine for forming a reduced tube 10 and a forging machine 20 for forming a locking protrusion having a relatively simple configuration. The nipple (1) can be supplied at a low price, and when it is used as a pipe connection nipple for drinking water, it is possible to prevent the closed end such as the detection of lead, as in conventional brass materials, and to improve durability for a long time. It is a very excellent invention that can achieve more than expected effects, such as the advantage that can be used without damage.

Claims (3)

Cold forging with both ends of the center 3 of the stainless steel short pipe (2) with a forging plate composed of a plurality of forging plates to reduce the outer diameter of the short pipe (2) to form a reducing tube (4) on both sides of the central portion, a plurality of grooves are formed Cold forging with a forging consisting of a plurality of forging rollers to be manufactured for manufacturing a nipple for flexible pipe, characterized in that for forming a plurality of engaging projection (4a) on the outer surface of the reduction tube (4). In constructing an apparatus for manufacturing a nipple for a flexible pipe, Reduction pipe forming forging machine 10 for forming reduction tube 4 on both sides of central part 3 of single pipe 2, and hooking protrusion forming end for forming locking protrusion 4a on the outer surface of reduction pipe 4; Consisting of early (10), The reduction tube forming forging machine 10 has a gear around the outer periphery so that the rack gear 12a operated by the driving means 12 can be driven by the rack gear 12a on the base 11. 13a) is provided, and the two or more forged plates 14 are positioned to be elastically supported by the mutual spring 15 in the rotor 13, A sliding protrusion 14a is formed on the outside of the forging plate 14, and a recess 13b is formed on the rotating body 13 to match the sliding protrusion 14a, and a guide hole 14b is provided on the bottom surface of the forging plate 14. Protruding to form a movement along the guide hole (11a) provided in the base (11), The locking projection forging machine 20 is to rotate the two forging rollers (21, 22) of the three forging rollers (21, 22, 23) in which the groove 24 is formed on the rotating shaft (25), one The forging roller 23 of the to allow the linear movement by the operating means 26, Apparatus for manufacturing a nipple for a flexible pipe, characterized in that the forging rollers are collectively driven by providing a gear box (27) so that the three forging rollers (21, 22, 23) can rotate in the same direction. delete