Manufacturing method of T-type connecting pipe

Abstract

The present invention can manufacture an integral T-shaped pipe by forming a forming hole of a predetermined shape on the upper side of a straight pipe, and then pulling the periphery of the forming hole through a press device and a forming mechanism to form a formed pipe section that protrudes outward, thereby manufacturing a T-shaped pipe that ensures robustness, productivity, and workability.

Description

[Technical field]

[0001] The present invention relates to a method for manufacturing a T-type connecting pipe, and includes a step S-1 of punching an elliptical forming hole 11 in the center of a metal plate 10, and then roll-forming the metal plate 10 to form a straight pipe 20 in a pipe shape; a step S-2 of fixing a fixture pipe 100 having a stop space 110 formed inside and a circular insertion hole 120 formed in the center in a lower mold 200; a step S-3 of positioning a forming stone 300 having a curved outer periphery in the stop space 110 through the insertion hole 120; a step S-4 of positioning the straight pipe 20 outside the fixture pipe 100; and a step S-5 of connecting the upper mold 400 and the lower mold 400 to each other. a step S-5 of connecting and fixing the upper mold 400 and the lower mold 200; a step S-6 of connecting the shaft 510 of the press device 500, which passes through the through hole 410 formed in the upper mold 400, to the molding stone 300; a step S-7 of raising the shaft 510 and forcing the molding stone 300 to pass through the molding hole 11 to form the molding tube portion 31 and mold it into the T-shaped tube 30; and a step S-8 of separating the upper mold 400 and the lower mold 200 and separating the T-shaped tube 30 from the jig tube 100. [Background technology]

[0002] Generally, pipes used in air conditioning facilities are passages through which fluids such as water, oil, and gas can move depending on the purpose of use. These pipes are usually formed in a straight shape and used, with branch pipes such as elbows, T-shaped, Y-shaped, and reducer pipes being connected between the pipes to distribute or merge the flow of fluids.

[0003] By using such branch pipes, it is not necessary to arrange and connect multiple straight pipes in a T-shape, Y-shape, or other shape, which shortens work time and reduces the use of materials. Maintenance and repair are relatively easy, and branch pipes are often used in public facilities and homes.

[0004] Such branch pipes are generally injection molded using a forming device or a die device, and examples thereof include the "Die Device for Forming Tee-Type Joint Pipes (Korean Patent Registered Publication No. 10-1444743)" in Patent Document 1 below.

[0005] The "mold device for molding a T-shaped coupling pipe" of Patent Document 1 includes a first mold frame having a space portion formed therein having a shape corresponding to the outer shape of the T-shaped coupling pipe, a second mold frame having a space portion formed therein having a shape corresponding to the outer shape of the T-shaped coupling pipe, connected to the first mold frame by a plurality of guide rods, and configured to be openable and closable between the first mold frame and the second mold frame, a bundle mold portion disposed in the space portion and configured to be spaced apart from the inner peripheral edges of the first mold frame and the second mold frame by a predetermined distance so that a cavity, which is a space in which the T-shaped coupling pipe is molded, is formed when the first mold frame and the second mold frame are closed, and one or more injection holes formed in the first mold frame or the second mold frame so that a softened resin composition is injected into the cavity, and the space portion is composed of a horizontal space portion and a vertical space portion connected to one side of the horizontal space portion, and a fluid flow guide frame is formed at the intersection of the horizontal space portion and the vertical space portion. This allows joint pipes to be easily manufactured in various pipe diameters, and allows branch pipes with various pipe diameters to be manufactured using one die device, thereby reducing production costs and manufacturing time.

[0006] However, the "T-shaped joint pipe molding die device" of Patent Document 1 has a problem in that the joint pipe is not molded as a single unit structurally, and the connecting portion is fragile. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Republic of Korea Patent Registration No. 10-1444743 Summary of the Invention [Problem to be solved by the invention]

[0008] The present invention has been devised to solve the above-mentioned problems, and the object of the present invention is to provide a method for manufacturing a T-shaped connecting pipe, which can manufacture an integrated T-shaped pipe by forming a forming hole of a predetermined shape on the upper side of a straight pipe, and then pulling the periphery of the forming hole to protrude outwardly through a press device and a forming mechanism to form a formed pipe section, thereby ensuring robustness, productivity, and workability. [Means for solving the problem]

[0009] In order to solve the above problems, the manufacturing method of the T-type connecting pipe according to the present invention includes the steps of: S-1, in which an elliptical forming hole 11 is punched in the center of a metal plate 10, and then the metal plate 10 is roll-formed to form a straight pipe 20 in a pipe shape; S-2, in which a fixture pipe 100 having a stop space 110 formed inside and a circular insertion hole 120 formed in the center is fixed to a lower mold 200; S-3, in which a forming stone 300 having a curved outer periphery is positioned in the stop space 110 through the insertion hole 120; and S-4, in which the straight pipe 20 is positioned outside the fixture pipe 100. The method includes a step S-5 of combining and fixing the upper mold 400 and the lower mold 200, a step S-6 of combining the shaft 510 of the press device 500, which passes through the passage hole 410 formed in the upper mold 400, with the molding stone 300, a step S-7 of raising the shaft 510 and forcing the molding stone 300 to pass through the molding hole 11 to form the molding tube part 31 and mold it into the T-shaped tube 30, and a step S-8 of separating the upper mold 400 and the lower mold 200 and separating the T-shaped tube 30 from the jig tube 100.

[0010] In addition, in the step S-1, the straight tube 20 has a diameter d of 147 mm to 149 mm, the molding hole 11 has a minor axis diameter b of 57.8 mm to 58.5 mm, and a major axis diameter c of 120.9 mm to 121.9 mm.

[0011] In addition, in the S-1 step, the ratio of the diameter d of the straight tube 20 to the minor axis diameter b of the forming hole 11 is 1:0.4, and the ratio of the minor axis diameter b of the forming hole 11 to the major axis diameter c is 1:2.

[0012] In addition, in the step S-3, the radius r of the outer circumferential surface of the molding stone 300 is the same as the radius of the straight tube 20. In addition, in the step S-7, the press device 500 raises the forming stone 300 at a pressure of 1 TON and a speed of 0.05 m / s, and pulls the periphery of the forming hole 11 to form the forming tube portion 31. Effect of the Invention

[0013] As described above, according to the present invention, a one-piece T-shaped pipe can be manufactured by forming a forming hole of a predetermined shape on the upper side of a straight pipe, and then pulling the periphery of the forming hole to protrude outwardly using a press device and a forming mechanism to form a formed pipe portion. This has the advantage of being able to manufacture a T-shaped pipe that is robust, productive, and easy to work with. [Brief description of the drawings]

[0014] [Figure 1] 1A to 1C are diagrams sequentially illustrating a method for manufacturing a T-type connecting pipe according to a preferred embodiment of the present invention. [Diagram 2] 1A to 1C are diagrams sequentially illustrating a method for manufacturing a T-type connecting pipe according to a preferred embodiment of the present invention. [Diagram 3] 1A to 1C are diagrams sequentially illustrating a method for manufacturing a T-type connecting pipe according to a preferred embodiment of the present invention. [Figure 4] 1A to 1C are diagrams sequentially illustrating a method for manufacturing a T-type connecting pipe according to a preferred embodiment of the present invention. [Diagram 5] 1A to 1C are diagrams sequentially illustrating a method for manufacturing a T-type connecting pipe according to a preferred embodiment of the present invention. [Figure 6] 1A to 1C are diagrams sequentially illustrating a method for manufacturing a T-type connecting pipe according to a preferred embodiment of the present invention. [Figure 7] 1A to 1C are diagrams sequentially illustrating a method for manufacturing a T-type connecting pipe according to a preferred embodiment of the present invention. [Figure 8] 1A to 1C are diagrams sequentially illustrating a method for manufacturing a T-type connecting pipe according to a preferred embodiment of the present invention. [Figure 9] 1A to 1C are diagrams sequentially illustrating a method for manufacturing a T-type connecting pipe according to a preferred embodiment of the present invention. [Figure 10] 1A to 1C are diagrams sequentially illustrating a method for manufacturing a T-type connecting pipe according to a preferred embodiment of the present invention. [Figure 11] FIG. 2 is an internal view showing the state of the jig tube, straight tube, and molding stone positioned between the upper and lower molds during the manufacturing method of the T-shaped connecting pipe according to a preferred embodiment of the present invention. [Figure 12] 1 is a state diagram showing the appearance of a metal plate and a straight tube. [Figure 13] FIG. 2 is a front view showing the state of a molding stone in the configuration of a manufacturing method for a T-shaped connecting pipe according to a preferred embodiment of the present invention. [Figure 14] 1 is a diagram showing an embodiment of a T-shaped pipe manufactured through a method for manufacturing a T-shaped connecting pipe according to a preferred embodiment of the present invention; FIG. [Figure 15] 1 is a diagram showing an embodiment of a T-shaped pipe manufactured through a method for manufacturing a T-shaped connecting pipe according to a preferred embodiment of the present invention; FIG. [Figure 16] 1 is a diagram showing an embodiment of a T-shaped pipe manufactured through a method for manufacturing a T-shaped connecting pipe according to a preferred embodiment of the present invention; FIG. [Figure 17] 1 is a diagram showing an embodiment of a T-shaped pipe manufactured through a method for manufacturing a T-shaped connecting pipe according to a preferred embodiment of the present invention; FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, a method for manufacturing a T-type connecting pipe according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. First, it should be noted that in the drawings, the same components or parts are indicated by the same reference numerals as much as possible. In describing the present invention, detailed descriptions of known functions or configurations related thereto will be omitted in order to avoid obscuring the gist of the present invention.

[0016] A method for manufacturing a T-type connecting pipe according to a preferred embodiment of the present invention will be described below with reference to FIGS.

[0017] As shown in Fig. 1, first, a metal plate 10 made of SUS or other metal material is prepared. At this time, an elliptical forming hole 11 is punched in the center of the metal plate 10 using a laser processing device or a punching device. Then, the metal plate 10 is roll-formed into a straight tube 20 (step S-1). At this time, the direction of the major axis diameter c, L of the forming hole 11 is aligned in the same direction as the length direction of the straight tube 20.

[0018] 2, the jig tube 100 that guides the molding of the straight tube 20 is stopped on the lower mold 200 (step S-2). At this time, a stop space 110 composed of an empty space is formed inside the jig tube 100, and an insertion hole 120 that is formed in a circular shape on the outer circumferential surface at the center side is formed so that the molding stone 300 described later can be inserted and pulled out. In this case, it is preferable that the insertion hole 120 is formed to have a larger diameter than the molding hole 11.

[0019] 3 or 4, the shaped stone 300 having a curved outer circumferential surface is placed in the stopping space 110 through the insertion hole 120 (step S-3). At this time, it is preferable that the radius r of the shaped stone 300 with respect to the outer circumferential surface is formed to be the same as the radius of the straight tube 20 as shown in FIG.

[0020] Next, as shown in Fig. 5 or Fig. 6, the jig tube 100 is lifted from the lower die 200, the straight tube 20 is coupled to the outside of the jig tube 100, and the jig tube 100 is again stopped at the lower die 200 (step S-4). At this time, the insertion hole 120 and the molding hole 11 are installed so that their centers are at the same vertical position. In this case, the insertion hole 120 is formed larger than the molding hole 11, so that the molding hole 11 is located inside the insertion hole 120 when viewed in a plane, as shown in Fig. 12.

[0021] 7, the upper mold 400 and the lower mold 200 are coupled and fixed (step S-5). At this time, a through hole 410 having the same diameter as the diameter d of the straight tube 20 is formed in the upper mold 400.

[0022] Thereafter, as shown in FIG. 11, the shaft 510 of the pressing device 500 passes through the through hole 410 and is coupled with the upper part of the forming stone 300 (step S-6).

[0023] 8, the press device 500 is driven to raise the shaft 510, and the forming stone 300 is forced to pass through the forming hole 11. As a result, a part of the periphery of the forming hole 11 is pulled upward and protrudes outward to form the forming tube part 31, and finally, the T-shaped tube 30 is formed (step S-7).

[0024] Next, as shown in FIG. 9 or FIG. 10, the upper mold 400 and the lower mold 200 are separated, and the T-shaped pipe 30 is separated from the jig pipe 100 (step S-8).

[0025] Through the above process, the straight tube 20 can be formed into a T-shaped tube 30.

[0026] On the other hand, Figures 14 to 17 are photographs showing an embodiment in which the forming stone 300 pulls the periphery of the forming hole 11 through the driving force of the press device 500 to form the forming tube portion 31 for each size of the minor axis diameter b, W, major axis diameter c, and L of the forming hole 11.

[0027] At this time, the driving conditions of the press device 500 were a pressure of 1 TON and a speed of 0.05 m / s, the forming stone 300 was raised to pull the periphery of the forming hole 11, and the straight tube 20 was formed with a diameter d of 147 mm.

[0028] As a result, in the case of the first molded product, in which the minor axis diameter W of the molding hole 11 was set to 105 mm and the major axis diameter L to 130 mm, the second molded product, in which the minor axis diameter W of the molding hole 11 was set to 69 mm and the major axis diameter L to 120 mm, the third molded product, in which the minor axis diameter W of the molding hole 11 was set to 77 mm and the major axis diameter L to 137 mm, the fourth molded product, in which the minor axis diameter W of the molding hole 11 was set to 64 mm and the major axis diameter L to 1,240 mm, and the fifth molded product, in which the minor axis diameter W of the molding hole 11 was set to 59 mm and the major axis diameter L to 120.9 mm, the outer surface of each molded tube portion 31 was torn or severely bent at the top end.

[0029] On the other hand, in the case of the sixth molded product in which the minor axis diameter W of the molding hole 11 was set to 57.8 mm and the major axis diameter L was set to 120.9 mm, and in the case of the seventh molded product in which the minor axis diameter W of the molding hole 11 was set to 58.5 mm and the major axis diameter L was set to 121.9 mm, each molded tube portion 31 was formed correctly without any particular problems.

[0030] In other words, when the diameter d of the straight tube 20 is set to 147 mm to 149 mm, and the minor axis diameter b of the forming hole 11 is formed to be 57.8 mm to 58.5 mm and the major axis diameter c to be 120.9 mm to 121.9 mm, it can be seen that a formed tube portion 31 is formed with its uppermost end parallel without any tearing occurring around the periphery.

[0031] According to the ratio, it can be seen that a good quality formed pipe portion 31 is formed when the ratio of the diameter d of the straight tube 20 to the minor axis diameter b of the forming hole 11 is 1:0.4, and the ratio of the minor axis diameter b to the major axis diameter c of the forming hole 11 is 1:2.

[0032] The drawings and the specification disclose the best embodiment. Although specific terms are used herein, they are used merely for the purpose of describing the present invention, and are not used to limit the meaning or the scope of the present invention described in the claims. Therefore, it should be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. In addition, the true technical scope of protection of the present invention is defined by the technical ideas of the appended claims. [Explanation of symbols]

[0033] 10:Metal plate 11: Molding hole 20: Straight tube 30: Tee tube 31: Molded tube part 100: Jig tube 200: Lower mold 300: Molded stone 400: Upper mold 500: Press equipment 510: Shaft b, W: minor axis diameter of the forming hole c, L: Long axis diameter of forming hole

Claims

1. Step S-1: punching an elliptical forming hole 11 in the center of a metal plate 10, and then roll-forming the metal plate 10 into a straight tube 20; Step S-2: the jig tube 100, which has a stop space 110 formed inside and a circular insertion hole 120 formed in the center, is stopped in the lower mold 200; The molding stone 300, whose outer periphery is curved, is inserted through the insertion hole 120. S-3 stage located in the stop space 110; Step S-4 in which the straight tube 20 is positioned outside the fixture tube 100; Step S-5: assembling and fixing the upper mold 400 and the lower mold 200; Step S-6: combining the shaft 510 of the press device 500 passing through the through hole 410 formed in the upper mold 400 with the molding stone 300; Step S-7: raising the shaft 510 so that the shaping stone 300 is forced to pass through the shaping hole 11 to form the shaping tube portion 31 and form the T-shaped tube 30; and a step S-8 of separating the upper mold 400 and the lower mold 200 and separating the T-shaped pipe 30 from the jig pipe 100. In the S-1 stage, The ratio of the diameter d of the straight tube 20 to the minor axis diameter b of the forming hole 11 is 1:0.4, The ratio of the minor axis diameter b to the major axis diameter c of the molding hole 11 is 1:

2. In the S-3 stage, The radius r of the shaping stone 300 with respect to the outer periphery is the same as the radius of the straight tube 20. Characterized by A method for manufacturing a T-shaped connecting pipe.

2. In the S-7 step, The press device 500 presses the molding stone 300 with a pressure of 1 TON and a speed of 0.05 m / s.

2. The method for manufacturing a T-shaped connecting pipe according to claim 1, wherein the formed pipe portion is formed by raising the pipe and pulling the periphery of the forming hole.

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