JP4076279B2 - Electric sewing pipe inner surface bead cutting cutter body hydraulic remote control method and apparatus - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a method and an apparatus for cutting an inner surface bead of an electric resistance welded tube.
[0002]
[Prior art]
The conventional method for remotely controlling the cutting of the inner surface bead is to continuously measure the thickness of the skelp during pipe making, and use the measured value to measure the bead cutting height with a cylinder placed below the inner surface bead cutting tool. A lifting / lowering device for controlling the height of the cutter body (e.g. Japanese Patent Laid-Open No. 60-131107) and moving the roll of the cutter body up and down, and a positioning drive device for adjusting the lifting position of the lifting device is disposed outside the steel pipe, A unit equipped with a method of connecting and controlling the positioning drive device and the lifting device by a remote lifting device with a drive shaft (for example, Japanese Utility Model Publication No. 63-172514), and a roll which is movable in the pipe radial direction by a fluid pressure cylinder A method of controlling the inner bead shape by controlling the external fluid pressure by controlling the external fluid pressure (for example, JP-A-6-346613) has been proposed.
[0003]
As described above, a method of controlling the cutting amount of the bead by controlling the tool or the roll arranged opposite to the tool by the fluid pressure has been proposed. In order to avoid chipping of the cutting tool at the time, it has not been adequately dealt with, and in addition, it has not been put into practical use to a smaller diameter than the structure of the bead cutting amount control mechanism.
[0004]
[Problems to be solved by the invention]
For example, to control the bead cutting amount on the inner surface of the ERW pipe, it is impossible to adjust the cutting amount of the cutting tool because there is a cutter body on the inner surface during continuous pipe making. In order to do so, it was necessary to make adjustments by stopping the pipe production. In addition, during continuous pipe production, when pipe production was stopped due to other factors, the bite was lost due to a shock due to the stop, which caused a serious problem of reduction in basic unit.
On the other hand, the remote control of bead cutting of the inner surface of the conventional ERW pipe is the method as described above, and in particular, the control range is narrow for small diameter size, and it cannot cope with wide wall thickness fluctuations. There is no mention of momentary bite evacuation when continuous pipe making is stopped. An object of the present invention is to provide a highly accurate control method capable of performing not only adjustment of the bead cutting amount but also retraction of the cutting tool at the time of pipe making stop, especially when the inner diameter bead cutting of the ERW pipe is performed at a small size. And an apparatus for the same.
[0006]
[Means for Solving the Problems]
The present inventors repeated various kinds of tests to achieve the above object. As a result, it was confirmed that the movable range can be widened by arranging a cylinder in the longitudinal direction of the steel pipe and a roll that moves up and down by a cam in contact with the cylinder in the opposite direction to the bite. Further, the inventors have found that by inserting a spring under a roll disposed on the downstream side of the cutting tool, the cutting tool can be retracted instantaneously even during pressure relief, and the present invention has been achieved.
[0007]
That is, the present invention relates to a method for cutting a welded inner surface bead generated on the inner surface of an electric welded tube obtained by welding an open pipe obtained by forming a steel strip, for example, a cutter for cutting an inner surface bead with a small diameter electric welded tube. steel pipe, characterized in that to enable removing all wide and instantaneous byte inner surface bead cutting movable range by inserting the spring under the rolls arranged in the hydraulic cylinder and byte downstream arranged a body in the longitudinal direction of the steel pipe An internal bead cutting remote control method and apparatus.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
In this invention, in the method of cutting the inner surface bead of the electric resistance welded tube obtained by welding the open pipe obtained by forming the steel strip, the electric sewing is performed to control the cutting amount of the cutter body that cuts the inner surface bead. The hydraulic pressure is supplied to a hydraulic cylinder arranged in the longitudinal direction of the pipe, and the hydraulic pressure is controlled remotely. In addition, since the spring is placed under the roll arranged on the downstream side of the cutting tool, the cutting tool can be retracted instantaneously.
[0009]
The reason why the hydraulic cylinder is installed in the longitudinal direction of the ERW pipe in the present invention is to widen the ID bead cutting movable range. For this reason, in the case of continuously forming the outer diameter of one conventional one, at least two or three types of cutter bodies having different sizes can be handled by this one type. Further, since the ID bead has a height, if the movable range is narrow, even if the cutter body is retracted, a bit is slightly lost at the tip of the bead. Such a movable range is not preferable because the ID byte basic unit is deteriorated.
[0010]
In this invention, the spring is installed under the roll arranged on the downstream side of the cutting tool because it is difficult to evacuate the cutting tool by its own weight when the continuous pipe making is stopped. Then, as is well known, air is entrained and the subsequent control becomes impossible. For this reason, a spring is installed under a roll arranged on the downstream side of the cutting tool so that it can urgently retreat when the hydraulic cylinder pressure becomes 0 kgf / cm ² .
[0011]
【Example】
Hereinafter, a method for cutting an inner bead of an electric resistance welded tube according to the present invention will be described in detail with reference to the drawings.
FIG. 1 is a diagram showing the manufacture of an ERW steel pipe to which the present invention is applied and the internal bead cutting remote operation.
After the steel strip 1 is formed into a tubular shape by the forming roll 2, the edge portion of the steel strip 1 formed into a tubular shape by the work coil 3 is heated and pressed by the pressurizing roll 4. Welded continuously to become an ERW pipe. At that time, a cutter body 8 is attached to the end of a mandrel bar 7 which is detachably attached to a bracket 6 fixed to the rolling stand 5 in order to cut a bead resulting from pressure contact with the edge portion. . The cutter body 8 incorporates a hydraulic cylinder 9 in the longitudinal direction of the steel pipe, and a hydraulic unit 10 for supplying pressure to the hydraulic cylinder is connected by a pipe 11. When hydraulic pressure is supplied from the hydraulic unit 10, the hydraulic cylinder 9 operates via the pipe 11. As a result, the roll 15 installed on the opposite side of the cutting tool 14 for cutting the bead via the cams 12 and 13 is driven. Furthermore, when it is necessary to urgently evacuate the cutting tool from the work piece bead, such as when continuous pipe making is stopped, it is difficult because it is evacuated by the weight of the cutting device. An evacuation spring 17 is installed below the roll 16 to enable emergency response.
[0012]
FIG. 2 shows an example of a hydraulic circuit diagram of the hydraulic unit. By this hydraulic unit, the bead cutting shape can be controlled by an arbitrary pressure. The hydraulic pressure boosted by the hydraulic pump 21 is turned on and off by the two-way valve 22 to the cutter body 25. The pressure supplied to the cutter body 25 is controlled by the proportional solenoid valve 23, and the pressure value is displayed by the pressure indicator 24 for control.
[0013]
FIG. 3 shows an appropriate pressure setting value when applied to a φ63.5 electric resistance welded tube. In the present invention, a cylinder with an inner diameter of φ16 is controlled between a hydraulic pressure of 160 to 200 kgf / cm 2 and a roller cutting reaction force of about 300 kg gives the best bead cutting shape.
From the above results, according to the present invention, the ERW pipe inner surface bead cutting can be remotely controlled and cut with a good bead cutting shape, and the movable range can be widened compared with the conventional method, and also during pressure relief. The tool can be saved instantly and can be applied to small size.
[0014]
【The invention's effect】
As described above, according to the apparatus and method of the present invention, the bead cutting of the inner surface of the ERW pipe can be performed by remote control and with a good bead cutting shape, and the movable range can be widened as compared with the conventional method. In addition, since the bite can be retracted instantaneously and can be applied to a small-diameter size even during pressure relief, a high-quality ERW pipe can be manufactured.
[Brief description of the drawings]
FIG. 1 is a diagram showing an electric resistance welded pipe manufacturing apparatus and an inner surface bead cutting remote control method to which the present invention is applied.
FIG. 2 is an example of a hydraulic circuit diagram of a hydraulic unit in the embodiment.
FIG. 3 is an appropriate pressure setting value when applied to a φ63.5 electric sewing tube in the embodiment.
[Explanation of symbols]
1 Steel strip 2 Forming roll 3 Work coil 4 Pressure roll 5 Rolling stand 6 Bracket 7 Mandrel bar
8 Cutter body 9 Hydraulic cylinder 10 Hydraulic unit 11 Piping 12 Cam 13 Cam 14 Bite 15 Roll 16 Roll 17 Retraction spring 21 Hydraulic pump 22 Two-way valve 23 Proportional solenoid valve 24 Pressure indicator 25 Cutter body

Claims (2)

Cutting amount of the cutter body where the cutting tool for cutting the inner surface bead is installed in a device that uses a cutting tool to cut the welded inner surface bead generated on the inner surface of the ERW pipe obtained by welding the open pipe obtained by forming the steel strip. To control the pressure, hydraulic pressure is supplied to a hydraulic cylinder placed in the longitudinal direction of the ERW pipe, the hydraulic pressure is controlled remotely, and a retraction spring is installed under the roll placed on the downstream side of the bite. In order to make it possible to control the cutting cutter body remotely by hydraulic pressure, a hydraulic cylinder and a retracting spring are mounted on the cutter body, and the cutting amount is controlled by the hydraulic pressure applied to the hydraulic cylinder. Remote control device for bead cutting in steel pipe. In a method of heating an edge of a steel strip formed into a tubular shape and pressurizing and pressing it with a pressure roll to continuously weld it into an electric resistance welded tube, a rolling stand is used for cutting the inner surface bead. A cutter body with a bead cutting bit is attached to the end of a mandrel bar that is detachably attached to a bracket fixed to the cylinder. This cutter body has a built-in hydraulic cylinder in the longitudinal direction of the steel pipe. A hydraulic unit that supplies pressure is connected by piping, and hydraulic pressure is supplied from the hydraulic unit to operate the hydraulic cylinder via the piping, and as a result, the opposite side of the cutting tool that cuts the bead via the cam The steel pipe inner surface bead cutting is characterized in that the roll installed in the machine is driven and the retraction spring is installed in the lower part of the roll arranged on the downstream side of the tool to enable emergency response.隔操 work method.

Images