JPS58142211A - Method for inspecting surface of roll - Google Patents

Abstract

PURPOSE:To find minute cracks and the like readily, by expanding and reflecting the roll in the state similar to a rolled material after rolling by a concave mirror. CONSTITUTION:The roll 1 after grinding is suspended, and the concave mirror 2 is arranged around the roll with a distance provided. Said concave mirror 2 has a reflecting surface 2a on the inner surface having an arc shaped cross section and expands and reflecting the circumferential direction of the roll 1. It is desirable that the magnification of the mirror is the same as the rolling rate of the material to be rolled, i.e. two - three times. The image of the roll 1 on the concave mirror 2 is expanded in the circumferential direction in a plane shape and indicates the same state as the rolled material after rolling.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention solves the problem of "fins" that occur on the surface of the Q rolling roll after grinding,
The present invention relates to a method for inspecting the surface of a roll for inspecting flaws such as "chattering".

After completing one step of rolling, the rolling roll is used repeatedly by grinding its surface. During this grinding process, depending on the accuracy of the grinder, the selection of the grindstone, and the skill of the operator, step-like flaws (so-called 1 burr or 1 chatter) may occur on the μm grinding surface. This flaw is transferred to the rolled material after rounding and grinding to check whether there is a flaw or not.
It is necessary to conduct a conventional inspection method for checking the presence or absence of defects. After grinding the rolled roll, drain the grinding fluid on the surface, and sprinkle it on the surface of any hand-rolled roll from a light source. Inspected by Mushitteme 4111. According to this inspection method, large-scale defects can be easily detected, but very large-scale defects are easily overlooked.For this reason, the rolling roll after grinding is removed from the rolling machine. The rolled material is set in the
In many cases, defects are discovered, but in this case, there are problems such as work loss time and the labor required to replace the four wheels. We focused on the fact that this criticism was discovered after rolling without visual inspection being invented. In other words, the key to the invention when visually inspected is that the compaction roll is in a one-sided state and has a convex shape, that is, a cylindrical outer and inner surface with nine convex surfaces. It is thought that this is because the light is disturbed and it is difficult to detect "fins" etc., which are difficult to detect. What is easy to find after rolling is that the rolled material becomes flea in proportion to the rolling rate, so the "fin" cape on the rolling roll surface expands in proportion to the rolling rate, and the rolled material is in a flat state. It is considered to be rounding.

The present invention is based on the above-mentioned knowledge 11. I would like it to be based on
The purpose of this is to use a concave mirror to enlarge the rolling roll to a state similar to that of the rolled material after rolling, so that the surface of the rolling roll can be easily detected to detect minute "burr" forces. The purpose is to obtain an inspection method.

In the present invention, which will be described below with reference to illustrative embodiments, a mill roll 1 after grinding is suspended, and this circumference 11! I
The K depressions i1*J are arranged at a distance.

This concave surface 2 has an inner surface having an arcuate cross section as a reflective surface 2a, and is designed to enlarge and photograph the circumferential direction of the pressure end roll 10. It is preferable that this expansion ratio is about the same as the rolling ratio of the rolled material, that is, 2 to 3 times.

However, in the present invention, the rolled nitrogen reflected on this concave surface -2
Observe and test the surface of the metal plate 1 for 1V to check for step-like flaws such as chattering.

In this inspection, the image of the rolling roll 1 reflected on the concave mirror 2 is enlarged in the circumferential direction and has a flat plate shape, which is the same state as the rolled material after piezoelectricity. This makes it extremely easy to inspect the ninth "fin".

As explained above, according to the present invention, since the rolling roll is inspected by enlarging it with a concave IJ + mirror, it is possible to easily detect burrs and solve problems such as lost time in work and labor for changing rolls. It has a great transfer effect.

[Brief explanation of the drawing]

The drawing is an explanatory view showing an example of a method for inspecting the surface of a rolling roll according to the present invention. 1... Pressure end four-wheel, 2... Concave mirror, Ja... Reflection direction. Applicant's representative Patent attorney Takeshi Kagami Yoshiki Y'

Claims (1)

[Claims] Around the mill roll after grinding, a bar structure with an inner surface having an arcuate cross section as a reflection direction is placed at a distance, and the circumferential direction of the mill roll is enlarged and mirrored on this concave surface. 1. A method for inspecting the surface of a rolling roll, which comprises inspecting the rolling roll for surface flaws.