JPH04220116A - Method for measuring temperature of forge weld butted part at forge welded tube manufacturing stage and manufacture of forge welded tube by setting temperature of forge weld butted part - Google Patents

Abstract

PURPOSE:To measure the temperature of a forge weld butted part in a real time by mounting a fiber scope between forge welding rolls and a welding horn. CONSTITUTION:A fiber scope 1 provided with a water-cooled protecting tube 6 having water-proof, dust-proof cooling functions is mounted between the forge welding rolls 13 and the welding horn 15. Image taken by a television camera 3 is sent by a picture processing equipment 4 to a color television monitor 9 through a recording VTR 8 and the temperature information is sent to a temperature measuring personal computer 5 and recorded in a storage device as occasion demands. Then, the temperature information returns again to the picture processor 4 and the temperature is displayed on the color CRT 11 together with the image.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a method for measuring the temperature of a forge-welded abutment in a forge-welded pipe manufacturing process, and a method of manufacturing a forge-welded pipe in which the temperature of the forge-welded abutment is set to the optimum temperature for forge welding. .

0002

[Prior Art] In order to ensure the quality of the forge-welded abutment of a forge-welded pipe, conventionally, for example, an infrared camera disclosed in Japanese Patent Laid-Open No. 52-23555 directly captures an image, and the image captured by the camera and the There is a method of displaying temperature information on separate CRTs to qualitatively grasp the temperature of the forge weld abutment and forming pipes at an appropriate temperature.

0003

[Problems to be Solved by the Invention] However, in such conventional means, the temperature of the forge weld abutment is high and the space is often narrow, and the installation method is difficult.
It is extremely difficult to measure temperature in the harsh environment of scale and water splashing, and there was no data that quantitatively captured the temperature during actual operation. That is, although there was data experimentally measured using a model in a static state, the forge welding temperature in actual operation was only empirical.

[0004] Also, the location where the infrared imaging camera is installed is
Because it was in an atmosphere of high heat, roll cooling water, steam, and dust, it was necessary to provide dustproofing, heatproofing, and protection from steel pipe cooling water splashes. Furthermore, sufficient measures must be taken to protect the camera, which is a precision electro-optical device, which poses problems such as high cost and limited equipment space due to increased size.

[0005] Furthermore, since the image captured by the camera and the temperature information within the field of view are displayed on two independent CRTs, there is a problem in that the operator must simultaneously monitor the two CRTs and make decisions. The present invention eliminates these problems of the conventional technology, and enables easy and continuous measurement of the temperature of the forge weld joint and setting of the optimum temperature even in adverse environments such as high heat, narrow spaces, and dust. The present invention provides a method for manufacturing a forge-welded pipe.

[0006]

[Means for Solving the Problems] The present invention provides a fiberscope equipped with a protection device such as water cooling between a forge welding roll and a welding horn, and displays an image of a forge weld abutment portion captured by the fiberscope on a TV. A method for measuring the temperature of a forge welded joint in a forge welded pipe manufacturing process, which is characterized by measuring the temperature of the abutment using a computer such as a camera, an image processing device, or a personal computer; A fiberscope equipped with a protection device such as This is a method for manufacturing a forge-welded pipe by setting a temperature at a forge-welded abutment part in a forge-welded pipe manufacturing process, characterized in that the temperature range is monitored and managed in real time so that the temperature range is an optimum temperature of 1400°C to 1450°C.

FIG. 2 shows a schematic diagram of a mill used in the forge-welded pipe manufacturing process. In the figure, 25 is a heating furnace, 24 is a No. 1 forming roll, 23 is No. 2 forming rolls, 22 a high frequency induction heating coil, 15 a welding horn, 13 a forge welding roll, 21 a drawing roll, and 20 a forge welding tube. Also, Figure 2
Although not shown inside, a fiberscope equipped with a water cooling device used in the forge-welded pipe manufacturing method of the present invention is installed between the forge-welded roll 13 and the welding horn 15 in the figure.

[0008] The mechanism of forge welding in the manufacturing process of forge welded pipes is that the welding horn 1 is used immediately before butting the edges of the skelps, which have been preheated to 1200°C to 1350°C.
Blow O2 at 5, Fe + 1/2 O2 =
The reaction heat of FeO + 64 kcal instantly raises the temperature of the abutting surface. At the same time, scale on the abutting surface is instantly removed. Thereafter, they are manufactured by butting and pressure welding using a forge welding roll 13.

[0009] Now, it has become possible to quantitatively measure and grasp the temperature immediately before welding, that is, the state of temperature increase due to O2 blowing, online using a forge welding abutment temperature measurement device consisting of a fiberscope, an image processing device, etc. Ta. the result,
As shown in the diagram of the appropriate range of abutment heating temperature in FIG. 3, it has been found that the optimum forge welding temperature in the packaging industry is 1400°C to 1450°C. It was also found that even if the temperature was raised to this temperature without O2 blowing, a sufficient bonding temperature could not be obtained, and that O2 blowing greatly contributed to the removal of scale from the abutting surfaces. Therefore, in order to obtain good forge welding joint strength, O2 blow or an equivalent gas is blown immediately before forge welding, and the temperature at that position is raised to 1400°C to 1450°C.
It is set to .

FIG. 1 is a system configuration diagram of an apparatus using the method of the present invention, in which a fiberscope 1 is a forge welding roll 1
3 and the welding horn 15. A water-cooled protection tube 6 is provided on the outer periphery of the fiberscope 1,
Air 18 circulates through the center, and cooling water 19 circulates around the outer periphery. 3 is T connected to fiberscope 1
This is a V camera, and the TV camera adapter 2 is provided with a lens 16 and a filter 17, and the TV camera 3 and TV
A camera protection box 7 covers the entire camera adapter 2. Furthermore, the TV camera 3 is provided with a VTR 8 for recording images, and the VTR 8 is provided with an image processing device 4 that detects temperature and temperature distribution. Furthermore, a temperature measuring personal computer 5 and a color TV monitor 9 are connected to the image processing device 4, so that the image captured by the fiberscope 1 can be displayed on the TV screen in real time. Also color TV monitor 9
A color hard copy 10 is provided, and hard copies can be made as appropriate. Temperature measurement computer 5
is a device that stores and calculates data, and is a color CR
Graphical processing such as graphs can be performed at T11, and printing can also be performed using the printer 12.

[0011]

[Operation] Next, the operation of the apparatus using the method of the present invention will be described based on FIG. As shown in FIG. 1, a fiberscope 1 having a water-cooled protection tube 6 with waterproof, dustproof, and cooling functions at the tip on the objective side is installed between the squelp abutment part that is the subject and the TV camera 3. Installation location is forge welding roll 13
This is the slight gap between the welding horn 15 and the welding horn 15, and it is also the part where the squelp abutment can be observed best. Also T
The image captured by the V-camera 3 is sent to the color TV monitor 9 by the image processing device 4 via the recording VTR 8, and the temperature information is sent to the temperature measurement personal computer 5 and recorded in the storage device as necessary. The temperature information is graphed by the temperature measuring personal computer 5, but the temperature information is returned to the image processing device 4 and the temperature is displayed on the color CRT 11 at the same time as the image.

By using the fiberscope of the present invention, it is possible to install the camera body, which is a precision electro-optical device, outside a harsh atmosphere, so the tip of the objective part is waterproof, dustproof, and the cooling device is protected. The device is simple and compact, and since the fiberscope itself is flexible, it is less susceptible to space constraints, and temperature measurements over a wide range can be performed by increasing the adjustment allowance for front, rear, left, right, top and bottom adjustments. In addition, by image processing,
The temperature information processing results performed by a separate personal computer can be displayed on the same CRT as the image captured by the camera, making it possible to provide more information to the operator on the screen.

Furthermore, by installing a VTR between the TV camera and the image processing device, image data can be stored, and temperature information can be stored using a storage device of a personal computer. Furthermore, by using this device to control the position of the welding horn and O2 pressure from the image-processed temperature distribution, it becomes possible to excellently set the temperature of the forge welded abutment.

[0014]

[Effects of the Invention] As described above, according to the present invention, the scale abutment part in the forge welded steel pipe manufacturing process, which is in a narrow space, high temperature, and a harsh atmosphere where roll cooling water, scale, etc. are scattered, can be stabilized for a long time. In addition to being able to measure the temperature in real time, it is also possible to display the image of the abutment area and temperature information of any part within the field of view on the same CRT, and by being able to record the image and temperature information of the abutment area, development analysis is possible. This makes it possible to improve the quality of the abutment part of forge-welded steel pipes.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of an apparatus showing an embodiment of the present invention.

FIG. 2 is a schematic diagram of a forge-welded steel pipe manufacturing mill.

FIG. 3 is a diagram showing the appropriate range of heating temperature of the abutment portion in the embodiment of the present invention.

[Explanation of symbols]

1 Fiber scope 2 TV camera adapter 3 TV camera 4 Image processing device 5 Temperature measurement computer 6 Water-cooled protection tube 7 Camera protection box 8 VTR 9 Color TV monitor 10 Color hard copy 11 Color CRT 12 Printer 13 Forge welding roll 14 Skelp 15 Welding Horn 16 Lens 17 Filter 18 Air 19 Cooling water 20 Forge welded pipe 21 Squeezing roll 22 High frequency induction heating coil 23 No. 2 forming rolls 24 No. 1 forming roll 25 Heating furnace

Claims (2)

[Claims] Claim 1: A fiberscope equipped with a protection device such as water cooling is provided between the forge weld roll and the welding horn, and the image of the forge weld abutment section captured by the fiber scope is transmitted to a TV camera, an image processing device, a personal computer, etc. A method for measuring the temperature of a forge welded abutment in a forge welded pipe manufacturing process, the method comprising measuring the temperature of the abutment using a calculator. 2. A fiberscope equipped with a protection device such as water cooling is provided between the forge weld roll and the welding horn, and the image of the forge weld abutment section captured by the fiber scope is transmitted to a TV camera, an image processing device, a personal computer, etc. The temperature of the forge welded abutment part in the forge welded pipe manufacturing process is characterized by measuring the temperature of the abutment part using a calculator, and monitoring and managing the temperature range in real time so that the temperature range is an optimum temperature of 1400°C to 1450°C. How to manufacture forge-welded pipes by setting.