JPS62843A - Control method for defect inspection of rolling bar - Google Patents

Abstract

PURPOSE:To obtain a rolling product which has no internal surface flaw and high size precision by controlling the defect inspection of a rolling bar automatically and supplying the rolling bar which has no defect at any time to a rolling mill. CONSTITUTION:The number of times and tonnage of a rolling bar are controlled by a computer 7 and a rolling bar which is used by the specific number of times and specific tonnage is carried out of a storehouse 1 by the indication of the computer 7 and sent to a rolling bar inspecting device 2; and an optical external diameter gauge 3 inspects its wear state and a longitudinal flaw inspecting device 4 and a lateral flaw inspecting device 5 inspect a longitudinal and a lateral flaw on the surface of the bar. Then, such a rolling bar that an inspection controller 9 decides that it has no defect by said inspection is returned to the storehouse 1 by a bar yard controller 10 and put in a specified address of the storehouse 1 by a crane controller 11. Such a rolling bar that the controller 10 decides that it has a defect is conveyed to a bar yard 6 and repaired, and then returned to the storehouse 1. Thus, rolling bars having no defect are supplied to the rolling mill at any time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a test roll method for defect inspection of rolled bars used in the manufacture of seamless pipes using a mandrel mill.

[Prior art and its problems]

To manufacture seamless pipes using a mandrel mill, a steel billet is heated to a predetermined temperature in a heating furnace and then perforated with a piercer to prepare a shell. After intermediate rolling of this shell with an elongator mill, the steel billet is heated to a predetermined temperature with a mandrel mill. It is rolled to obtain the outer diameter and wall thickness, and then the outer diameter is corrected using sipes.

In the above-mentioned rolling of the elongated mill and mandrel mill, a rolling bar is used, and the rolling bar is used to roll the material to a predetermined inner diameter.

Rolling bars are usually used repeatedly as one crew, but as a result of rolling loads in various directions, frictional force with the shell, thermal stress, etc. during rolling, cracks, scratches, etc. Defects such as wear may occur.

If a rolling bar with such defects is used to roll a shell, internal defects will occur on the product, dimensional accuracy will be adversely affected, and in extreme cases, the rolling bar will break and the mill will be damaged. There is a risk of causing a major accident.

However, in the past, it has been difficult to accurately determine the state of wear and tear on the rolling bar, and the only way to do so has been to replace the rolling bar based on the number of times it has been used, and the above-mentioned problem has not been solved.

[Purpose of the invention]

The purpose of this invention is to automatically control defect inspection of rolled bars used for seamless pipe manufacturing using a mandrel mill, and to always supply defect-free rolled bars to the rolling mill.
It is an object of the present invention to provide a method for manufacturing rolled products with high dimensional accuracy and no internal defects.

[Summary of the invention]

This invention automatically manages the number of uses of rolling bars used in seamless pipe manufacturing by a computer based on predetermined standards, and for rolling bars that have exceeded the predetermined number of uses,
The presence or absence of defects is automatically inspected using an inspection device consisting of an optical outer diameter meter for inspecting the state of wear and a surface flaw detector for inspecting the surface flaws, and based on the above inspection results, The inspection controller automatically sorts the rolled bars into defective and non-defect rolled bars, and the bar yard controller transports the defective rolled bars to the bar yard for repair processing to produce defect-free rolled bars. is characterized by being transported to a warehouse and stored at a predetermined location.

[Structure of the invention]

Next, the present invention will be explained with reference to the drawings.

The drawing is a system diagram showing one embodiment of the present invention. In the drawing, a warehouse 1 for storing rolling bars is a fully automated system in which rolling bars can be automatically stored and taken out at predetermined locations for each crew.

The rolled bar inspection device 2 includes an optical outer diameter meter 3 for inspecting the wear condition of the rolled bar by measuring the outer diameter value, and a rotating probe type vortex meter for inspecting vertical flaws generated on the surface of the rolled bar. It consists of a vertical flaw detector 4 consisting of a flaw detector, and a cross current flaw detector 5 consisting of a fixed globe type eddy current flaw detector for inspecting the cross current generated on the surface of the rolling bar. Inspect for scratches, scratches, dents, rough skin, etc.

The bar yard 6 repairs defective bars detected by the rolled bar inspection device 2.

In addition to controlling the process of the rolling mill 8, the computer 7 also performs
The inventory management of rolling bars in the warehouse 1, the number of times the rolling bars are used and the number of rolling cars used, and the inspection results by the rolling bar inspection device 5 are monitored, and the usage limit of the rolling bars is determined from the above data. , restore the rolling bar that is at the limit of its use.

The inspection controller 9 sorts the rolled bars into defective rolled bars and defect-free rolled bars based on the inspection results of the rolled bars by the rolled bar inspection device 5, and inputs them into the computer 7.

The bar yard controller 10 performs sequence control such as conveyance and unloading of rolling bars to the bar yard 6. That is, according to instructions from the computer 7, rolled bars that have been taken out from the warehouse 1 and have used a predetermined number of times and a predetermined number of electricity are sent to the rolled bar inspection device 2, and after being subjected to a predetermined inspection by the inspection device 2, the inspection controller According to the instruction 9, the rolling bars without defects are returned to the warehouse 1, and the rolling bars with defects are transported to the bar yard 6 for repair processing.

According to instructions from the computer 7, the crane controller 11 transports and stores the rolling bar at a designated address in the warehouse 1.
Further, the rolling bar stored at the specified address is carried out from inside the warehouse 1.

Since the present invention is configured as described above, the number of times the rolling bar is used and the number of rolling wheels used are managed by the calculator 7, and the rolling bar that has been used a predetermined number of times and for a predetermined number of electric currents is managed by the calculator 7. , is carried out from the warehouse 1, sent to the rolling bar inspection device 2, and then inspected by the optical outer diameter gauge 3.
The wear condition is determined by the vertical flaw inspection device 4 as 79- vertical flaw force t1 on the surface, and by the horizontal flaw inspection device 5 as pJ-
The surface cross currents are respectively checked.

As a result of such an inspection, the rolled bar determined by the inspection controller 9 to be free of defects is checked by the yard controller 10.
is returned to the warehouse 1 by the crane controller 11.
is stored at the designated address in warehouse 1.

On the other hand, as a result of the above-mentioned inspection, the rolled bar determined to be defective by the inspection controller 9 is transported to the bar yard 6 by the transport yard controller 10.
The repair process will be performed at the factory. The rolled /4-, which has been repaired in this way, is returned to the warehouse 1 by the yard controller 10 and stored at a designated address in the warehouse 1 by the crane controller 11. Incidentally, rolling bars that are so defective that they cannot be repaired are discarded at the yard 6, and new rolling bars 9- are stored at a designated address in the warehouse 1.

〔Effect of the invention〕

As described above, according to the method of the present invention, the quality of the rolled bar can be automatically and accurately controlled, and defect-free rolling bars can always be supplied to the rolling mill. An excellent effect in industry 1 is brought about in that inner surface defects do not occur and products with high dimensional accuracy can be rolled.

[Brief explanation of drawings]

The drawing is a system diagram showing one embodiment of the method of the present invention. In the drawings, 1... Warehouse 2... Rolling bar inspection device 3
...Optical outer diameter gauge 4...Vertical flaw inspection device 5...
Defect inspection device 6... Bar yard 7... Calculator
8... Rolling mill 9... Inspection controller lO... Bar yard controller 11... Crane controller.

Claims (1)

[Claims] The number of uses of rolling bars used in seamless pipe manufacturing is automatically managed by a computer based on predetermined standards.
Rolled bars that have been used for more than a specified number of times can be checked for defects using an inspection device consisting of an optical outer diameter meter to check the state of wear and tear, and a surface flaw detector to check for surface flaws. The presence or absence is automatically inspected, and based on the above inspection results, the inspection controller automatically sorts the rolled bars into defective and non-defective rolling bars. A defect inspection control method for rolled bars, characterized in that the bars are transported to a bar yard for repair processing, and rolled bars with no defects are transported to a warehouse and stored at a predetermined location.