KR20020038202A - The equipment for manufacturing a slender and round metal pipe - Google Patents

Abstract

PURPOSE: An apparatus for manufacturing a micro metal pipe is provided to manufacture a pipe having a diameter less than 8m/mΦ and to improve the reliability of the welding work by remarkably reducing the length of a heat effected zone. CONSTITUTION: A pair of bonding roller(10,10a) are arranged on a base(12). Semicircular recess sections(11,11a) are formed in the bonding rollers(10,10a). The bonding rollers(10,10a) have a cooling water passage. A vertical shaft is installed in a vertical space formed in the base(12). A needle bearing is interposed between the outer portion of the vertical shaft and the vertical space. In addition, the vertical shaft is rotatably supported by a ball bearing in the vertical space. A cooling water passage is formed in the roller(10) so as to maximize the cooling effect of the roller(10). A coil type electric heater(30) is arranged adjacent to the bonding rollers(10,10a).

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. ) Between the semicircular recesses 11 and 11a of the pair of joining rollers 10 and 10a. At this time, the joining roller is conventionally rotatably arranged on the vertical axis and strongly adheres to the welding point 5. In order to squeeze, the diameter of the roller is relatively large, but the pipe diameter to be piped is three diameters, so the point passing through the center of the pair of rollers and the roller becomes the pressure point (welding point (5)). In practice, it is impossible to manufacture a welding capillary of 8 m / mΦ or less because it is already uncertainly bonded before reaching the pressure point (welding point 5) of the joining roller, which may cause product defects. As a landscape manufacturing method, a welding pipe with a diameter of 10 m / mΦ or more is manufactured, and the work of repeatedly drawing shafts of diameters of 10 m / mΦ or less in a separate line is repeated several times to produce a fine diameter pipe having a required diameter or 10 m. / mΦ Weld pipes of more than / mΦ in a consistent process to produce the product by heat treatment immediately after the sequential reduction work. The two thin tube manufacturing method has to go through a separate drawing process or a heat treatment process after reduction, so that the welded part due to the increase in manufacturing cost and stretching of raw materials There is a vulnerability that does not guarantee the reliability of the strength.

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 20. Coolant water channel

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 middle part of the outer circumferential surface where actual joining is carried out in the known pipe making process, and a pair of small diameter joining rollers 10, 10a having a coolant passage 11b on the inner circumferential surface thereof. Is placed on the base 12 closest to each other, but the vertical axis 13 of constant length, which is integrally lowered with the joining roller 10 on one side, is inserted into the vertical axis receiving space 14 provided inside the base 12. In the installation, the needle bearing 15 is interposed between the upper outer peripheral surface of the upper surface of the vertical shaft 13 and the vertical bearing space 14, and the ball bearing 16 is disposed in the outer peripheral surface of the vertical shaft 13 and the vertical bearing space 14. The vertical axis 13 is rotated freely, and the vertical coolant inlet 17 is installed at the center of the vertical axis 13 and the upper surface of the vertical axis 13 and the upper side of the vertical axis 13 are in communication with the upper end of the vertical coolant inlet 17. Vertical axis 13 of length at which negative joining rollers are built up On the outer circumferential surface, approximately three arc-shaped coolant water outlet grooves 18 are recessed, and the lower side of each coolant water outlet groove 18 is in communication with the vertical communication hole 19 laid in the thickness of the vertical axis 13, respectively. The water flow direction of the coolant supplied from the outside is supplied from the vertical coolant water inlet 17 of the vertical shaft 13 so as to increase the vertical efficiency via the coolant water outlet groove 18 on the roller 10 side. In the middle part, the cooling water passage groove 20 is provided to maximize the cooling efficiency of the roller 10, and the pair of rollers 10 as described above is provided as a pair, and the pair of rollers 10 and 10a is provided. And a coil-type electric heater (30) in close proximity to the production of metal pipes of the tubular electric tube carried out in accordance with the present invention by passing through the narrow tube (P) to be welded inside the circular coil of the coil-type electric heater (30). The structure of the device 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 diameter joints in which semi-circular concave surfaces 11 and 11a are formed in the concave portion in the middle of the outer circumferential surface and a coolant passage 11b is provided in the inner circumferential surface. The rollers 10 and 10a are placed close to the base 12 so as to be positioned close to each other, but the vertical shaft 13 having a predetermined length that is integrally arranged downwardly with the joining roller 10 on one side is provided in the base 12. In the charging and placing in the vertical storage space 14, a needle bearing 15 is interposed between the upper outer peripheral surface of the upper surface of the vertical axis 13 and the vertical bearing space 14, and the lower outer peripheral surface of the vertical axis 13 and the vertical bearing space ( 14, the vertical shaft 13 is rotatably laid out by the ball bearing 16, and the vertical cooling water inlet 17 is installed around the vertical shaft 13, and the vertical shaft 13 is in communication with the upper end of the vertical cooling water inlet 11. ) Road where the joining roller of the upper surface and the upper part of the vertical shaft 13 is built up On the outer circumferential surface of the vertical axis 13 of the approximately three arc-shaped coolant water outlet groove 18 is formed in the recess, the lower side of each coolant water outlet groove 18 is vertically vertically drilled in the thickness of the vertical axis (13) ( 19) and a pair of joining rollers (10) having a coolant water passage (20) in the middle of the inner peripheral surface of the joining roller (10) and a pair of joining rollers (10) and (10a). A narrow tubular welding device provided with a coiled electric heater (30) closest to each other and allowing a tubular pipe (P) to be welded to the inner side of the circular coil of the coiled electric heater (30).