JP2000005825A - Steel pipe end groove processing machine - Google Patents

Abstract

(57) [Problem] To provide an annular groove in the vicinity of an end face of a steel pipe, the circumferential direction of the depth and width of the annular groove is reduced.
The present invention also provides a steel pipe end face groove processing machine that eliminates spiral deviation. SOLUTION: A mechanism for clamping a steel pipe, a die for circumferentially grooved the outer surface of the steel pipe, a copying roll arranged on both sides of the die, an air cylinder for pressing down the die and the copying roll, and a die / copying A steel pipe end face groove processing machine comprising a face plate for rotating a roll and an air cylinder along an outer peripheral direction of a steel pipe, and an electric motor for rotating the face plate. [Effect] It is possible to perform annular groove machining on the outer surface of the steel pipe with high efficiency and with high accuracy regardless of the roundness of the steel pipe.
In addition, grooving can be performed regardless of the degree of bending in the longitudinal direction of the steel pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel pipe end groove processing machine used for machining an annular groove near a steel pipe end face for coupling with a joint member at a piping site.

[0002]

2. Description of the Related Art Conventionally, there is a tool (FIG. 4) for machining an annular groove in the end face of a steel pipe as shown in, for example, Japanese Utility Model Application Laid-Open No. 1-151910. The tool is set so that the roll 2 comes into contact with the outer surface of the steel pipe, and while the tool is manually turned in the circumferential direction of the steel pipe 1, the handle 3 is turned to lower the die 10 via the screw 4 to the outer surface of the steel pipe. In this method, an annular groove is formed. Also, as shown in FIG. 5, the steel pipe rotating drive roll 5 is brought into contact with the steel pipe inner surface, and the auxiliary roll 6 is brought into contact with the steel pipe outer surface to prevent blurring when rotating the steel pipe. There is a method in which a die 10 is pressed down on the outer surface by a hydraulic cylinder 7 to form an annular groove.

[0003]

However, in the method shown in FIG. 4, since the die 10 and the presser roll 2 press down the outer surface of the steel pipe while keeping a constant distance, if the roundness of the steel pipe 1 is poor, the annular groove will not be formed. Because the depth and width dimensions vary greatly in the circumferential direction, a required annular groove may not be obtained. In addition, since the annular groove is formed while turning the tool by hand, the production efficiency is low.

In the method shown in FIG. 5, the steel pipe 1 is rotated to form an annular groove. If the steel pipe 1 is slightly bent in the longitudinal direction, the steel pipe 1 is displaced in the longitudinal direction during the rotation of the steel pipe. In some cases, there is a problem in that the groove cannot be processed into an annular groove and the groove is displaced in a spiral shape.
SUMMARY OF THE INVENTION An object of the present invention is to provide a steel pipe end face groove processing machine which eliminates variations in the circumferential direction of the depth and width of the annular groove and the spiral deviation according to the conventional method.

[0005]

SUMMARY OF THE INVENTION The present invention provides a mechanism for clamping a steel pipe, a die for circumferentially groove-forming the outer surface of the steel pipe, a copying roll arranged on both sides of the die, and a die and a copying roll. A steel pipe end groove processing machine characterized by comprising an air cylinder to be lowered, a face plate for rotating a die / copying roll and an air cylinder along an outer peripheral direction of a steel pipe, and an electric motor for rotating the face plate.

[0006]

1 and 2 are a front view and a side view, respectively, of a steel pipe end face grooving machine according to the present invention. The device of the present invention
A clamping mechanism 8 for mainly clamping the steel pipe, an air cylinder 15 for rolling down the die 10 and the copying roll 11 on the outer surface of the steel pipe, a face plate 14 for rotating the die 10 along the outer surface of the steel pipe, and rotating the face plate It is composed of an electric motor 19. That is, by fixing the steel pipe 1 and rolling it down by the die 10 with the copying roll 11, it is possible to form an annular groove with a constant dimension on the outer surface of the steel pipe regardless of the roundness of the steel pipe. . Moreover, since the steel pipe 1 is fixed and the face plate 14 is rotated, a good annular groove can be formed irrespective of the magnitude of the bending in the longitudinal direction of the steel pipe.

The tip of the groove machining die 10 has a shape that matches the groove shape. The die 10 is a bearing 12
In order to prevent the groove depth from being excessive due to excessive pressure of the die 10, the die 10
The copying roll 11 is arranged on both wheels. For this reason,
The dimensions of the die 10 and the copying roll 11 are determined so that the difference between the die radius and the radius of the copying roll becomes the groove depth (FIG. 3).

Further, an air cylinder 15 is attached to the face plate 14 in order to press down the die 10 and the copying roll 11 on the outer surface of the steel pipe. In order to obtain the rolling force for forming the required groove shape from the air pressure, a booster mechanism 13 as shown in FIG. 1 may be employed, or the air pressure may be increased by using a pressure increasing valve or the like. A universal joint 17 and the like are used to connect the air pipe 16 between the rotating face plate 14 and the body of the groove processing machine. A pressure adjusting valve 18 is attached to the air pipe 16 on the way to adjust the die reduction force. The face plate 14 is configured to be rotated by a rotation motor 19 via a face plate rotation bearing 20 and a gear. Further, a clamp mechanism 8 for clamping the steel pipe 1 is arranged at the forefront of the groove processing machine.

[0009]

According to the present invention, an annular groove can be formed on the outer surface of a steel pipe with high efficiency and high accuracy regardless of the roundness of the steel pipe. Further, the groove can be formed regardless of the degree of the bending in the longitudinal direction of the steel pipe.

[Brief description of the drawings]

FIG. 1 is a diagram showing a front view of a grooving machine of the present invention;

FIG. 2 is a diagram showing a side view of the grooving machine of the present invention;

FIG. 3 is an explanatory view of a die and a copying roll of the present invention,

FIG. 4 is a view showing a conventional hand-operated grooving tool;

FIG. 5 is a view showing a conventional electric grooving machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steel pipe 2 Holding roll 3 Handle 4 Screw 5 Driving roll for steel pipe rotation 6 Auxiliary roll 7 Hydraulic cylinder 8 Clamp mechanism 9 Annular groove 10 Die 11 Copying roll 12 Bearing 13 Boosting mechanism 14 Face plate 15 Air cylinder 16 Air pipe 17 Universal joint 18 Pressure control valve 19 Faceplate rotation motor 20 Faceplate rotation bearing

Claims (1)

[Claims] 1. A mechanism for clamping a steel pipe, a die for circumferentially grooving the outer surface of the steel pipe, a copying roll disposed on both sides of the die, an air cylinder for pressing down the die and the copying roll, and a die. A steel pipe end groove processing machine comprising: a face plate for rotating a copying roll and an air cylinder along an outer peripheral direction of a steel tube; and an electric motor for rotating the face plate.