KR100430592B1 - The equipment for manufacturing a slender and round metal pipe - Google Patents

Abstract

The present invention is a device for manufacturing metal tubular pipes for use in automobile hydraulic circuit system connection, refrigerator refrigerant condenser, etc. In particular, the conventional tubular tubules of 10 m / mΦ or less, which are fine tubular tubes that have not yet overcome the product defect rate, product defects It is an invention devised for the structure of a metal tubular tube manufacturing apparatus that can be mass-produced in an inline process without a mass.

Description

Equipment for manufacturing a slender and round metal pipe}

The present invention relates to the technical field of pipes for the manufacture of metal pipes. As a pipe method for manufacturing metal pipes, a pipe material steel plate is used at a constant torsion angle applied when a large diameter pipe used for water and sewage is used. Spiral seam is welded by welding both ends of the longitudinal direction of the material steel plate that is bent with a spiral arc in the width direction to be welded to each other at a constant torsion angle, or in the case of a small diameter pipe, the pipe material iron plate is sequentially Metal pipes are manufactured by a straight seam which bends the cross section gradually in a circular shape while passing through a plurality of pairs of bending rollers having a large arc angle.

Among the small diameter metal pipes of small diameter, in particular, when manufacturing a welded tubular tube of less than 8 m / mΦ, which is frequently used for oil, pneumatic conveying or electric refrigeration, refrigerator refrigerant conveying, etc. Before passing through a pair of joining rollers for finally welding and joining the welded portions of the both ends of the pipe material sheet bent to the pipe as shown in FIG. 1, the two welded ends 2 (2a) with the electric resistance heater 1 as shown in FIG. ) Is passed between the semicircular recesses 11 and 11a of the pair of joining rollers 10 and 10a. At this time, the joining roller is conventionally installed in the axial direction freely on the vertical axis and the welding point 5 In order to strongly squeeze the pressure, the diameter of the roller is relatively large, while the pipe diameter is a small diameter. Although it is preferable, in practice, this alternative is not possible because the welding capillary of 8 m / mΦ or less is usually impossible because the bonding is already uncertain before reaching the pressure point (welding point 5) of the joining roller. As a conventional thin pipe manufacturing method, a welding pipe having a diameter of 10 m / mΦ or more is manufactured, and a pipe diameter drawing of a pipe having a diameter of 10 m / mΦ or less is repeatedly performed off-line to produce a fine diameter pipe of a required diameter. In order to produce the product by heat treatment immediately after the reduction work in order to reduce the welding pipe of 10 m / mΦ or more in a consistent process. There is a vulnerability that does not guarantee the reliability of the weld according to the.

Accordingly, an object of the present invention is to provide an apparatus for producing a metal tubular tube for producing a pipe having a diameter of 10 m / mΦ or less, particularly a pipe having a diameter of 8 m / mΦ or less.

BRIEF DESCRIPTION OF THE DRAWINGS Explanatory drawing which shows the welded part flatly when manufacturing metal with a low melting point conventionally.

Figure 2 is a state perspective view of the steel pipe welded by a squeeze roller for electric heating welding pipe material sequentially bent in the longitudinal direction, which is the core of the pipe manufacturing apparatus according to the present invention

3 is a cross-sectional view taken along the line A-A 'in FIG.

Figure 4 is an exploded perspective view of the upper side of the squeeze roller implemented in accordance with the present invention in two sets

<Code Description of Main Parts of Drawing>

P. Pipe 1. Electric work coil

2,2a. Welding tip 5. Welding point (pressure point)

10,10a. Junction Rollers 11, 11a. Semicircle

11b. Coolant channel 12. Expectation

13. Vertical axis 14. Vertical axis accommodation space

15. Needle Bearing 16. Ball Bearing

17. Vertical coolant inlet 18. Coolant outlet

19. Vertical communication hole 21. Roller fixing plate

The present invention has been made to solve the reproblem caused in the conventional manufacturing of the conventional tubular tube (P) as described above based on the accompanying drawings, which can be precisely welded with high strength. Since the assembly structure of the junction roller is the same, only the junction roller assembly structure of one side will be described.

Semi-circular concave surface 11, 11a is formed in the center of the outer circumferential surface in which the actual joining is performed in a known pipe-making process, and a pair of small diameter joining rollers 10, 10a provided with a cooling water passage groove 11b on the inner circumferential surface. ) Is placed on the base 12 closest to each other, but the vertical axis 13 of a predetermined length that is axially installed downwardly integrally with the joining roller 10 on one side thereof is provided with a vertical axis space ( 14, the needle bearing 15 is installed in the axial direction between the upper outer peripheral surface of the upper surface of the vertical axis 13 and the vertical bearing space 14, and the outer peripheral surface of the lower axis of the vertical shaft 13 and the vertical bearing space 14 The vertical shaft 13 is installed in the axial direction with the ball bearing 16 in a rotational manner, and a vertical coolant inlet 17 is formed around the vertical axis 13, and the vertical shaft 13 is in communication with the upper end of the vertical coolant inlet 17. 13) Joining roll on upper surface and upper side of vertical axis (13) Roughly three arc-shaped coolant water outlet grooves 18 are formed in the outer peripheral surface of the length of the vertical shaft 13 in which the chuck is installed in the axial direction, and the lower side of each coolant water outlet groove 18 is a thickness velocity of the vertical shaft 13, respectively. The water flow direction of the coolant supplied from the outside is in communication with the vertical communication hole (19) formed in the through is supplied from the vertical cooling water inlet hole 17 of the vertical shaft (13) to the coolant water outlet groove 18 of the roller 10 side In order to increase the vertical efficiency via the coolant passage 11b to maximize the cooling efficiency of the roller 10 in the inner circumferential surface of the roller 10 and to provide a pair of the junction roller 10 as described above. In accordance with the present invention, a coil-type electric heater 30 is provided in close contact with a pair of the junction rollers 10 and 10a and the tubular tube P to be welded into the circular coil of the coil-type electric heater 30 passes. Of the metal pipe of the tubular tube The structure of the manufacturing apparatus is constructed. In the figure, reference numeral 21 is a roller fixing plate.

In the metal narrow tube manufacturing apparatus according to the present invention configured as described above, the joining rollers 10 and 10a are fixedly spoken with the vertical axis 13 so that the joining rollers 10 and 10a are rotated by the rotation of the shaft 13. Rotates integrally, but the length of the vertical axis is relatively long, and the needle bearing 15 and the ball bearing 16 rotate and support the upper and lower outer circumferential surfaces of the vertical axis, respectively. (Squeeze) and weld precisely by squeezing (center pressure point of the joining roller), and also the outer diameter of the joining rollers 10 and 10a is very small, so that the welding point 5 and the electric resistance heater 30 Since the heating is performed in close proximity to the shortest distance, this high heat eliminates the heat loss transmitted to the outer circumferential surface of the pipe (P), so that almost all of this high heat is concentrated at the welding point, thereby ensuring a positive welding.As it is made by continuous and consistent work at the same time as the arc bending, it is possible to mass-produce 8 m / mΦ ~ 6.3 m / mΦ tubular pipes in a single pipe line, which has not been possible because of poor weldability. In addition, it is possible to provide a cost-effective and thinner tube which greatly improves the reliability of welding welding by significantly reducing the length of the heat effect zone.

Claims (1)

In continuous production of metal thin tubular pipes in a continuous operation, a pair of small diameters having semicircular concave surfaces 11 and 11a formed in the concave portion in the middle of the outer circumferential surface and having a coolant passage 11b in the inner circumferential surface The joining rollers 10 and 10a are placed close to the base 12 in close proximity, and a vertical axis 13 having a predetermined length that is integrally lowered with the joining roller 10 on one side is provided inside the base 12. In the vertical installation in the vertical storage space 14, the needle bearing 15 is installed in the axial direction between the upper outer peripheral surface of the upper surface of the vertical shaft 13 and the vertical storage space 14 in the axial direction, and the lower outer peripheral surface of the vertical shaft 13 and the vertical bearing In the space 14, the vertical shaft 13 is axially rotatably installed by the ball bearing 16, and a vertical coolant inlet 17 is formed around the vertical axis 13 and communicates with the upper end of the vertical coolant inlet 17. Joining roller of the upper surface of the vertical axis 13 and the upper side of the vertical axis 13 On the outer circumferential surface of the vertical shaft 13 of the length provided in the axial direction, approximately three arc-shaped coolant water outlet grooves 18 are formed in the recesses, and the lower side of each coolant water outlet groove 18 is in the thickness of the vertical axis 13, respectively. In order to communicate with the formed vertical communication hole (19), the joint roller 10 is provided with a pair of joining rollers (10) provided with a coolant water passage (11b) in the middle of the inner peripheral surface of the joining roller (10). And a coil-type electric heater (30) closest to the (10a), and to pass through the tubular pipe (P) to be welded to the inner side of the circular coil of the coil-type electric heater (30).