JPH05337795A - Band-shaped metal piece grinding device - Google Patents

Abstract

PURPOSE:To provide a grinding device for band-shaped metal work which can prevent remaining of grinding texture and producing of chattering marks on the surface of the metal work by adjusting the grinding texture by the use of laminate type grinding rolls having different orientations about the grinding texture. CONSTITUTION:A plurality of grinding rolls of laminate type are arranged to form a grinding processing line which grinds a band-shaped metal work 1 continuously, wherein grinding rolls 2, 3 of straight type are arranged in the fore stage while inclining type grinding rolls 4, 5 are installed in the rear stage. Thus a grinding device for band-shaped metal work 1 is configured. This can yield products excellent in the surface property and without unevenness in the luster.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grinding apparatus for obtaining a good grinding surface with a laminating type roll-shaped grinding tool in surface grinding of a band-shaped metal body having a scale.

[0002] In the present specification, the term "band-shaped metal body" refers to a hot-rolled sheet (band) or coil made of stainless steel, ordinary steel, titanium and its alloys, high alloys, etc. by a conventional method, or thin-wall continuous casting. It means a plate (band) or a wound coil.

[0003]

2. Description of the Related Art In the process of producing a strip-shaped metal body, heating of the slab and subsequent hot rolling, continuous casting of thin-walled slab, or the like, or further after annealing or annealing and pickling, oxide scale or a scale on the surface of the strip-shaped metal body. Since surface flaws occur, steps are required to remove these and finish the surface.

In order to meet such requirements, a strip-shaped metal hot-rolled sheet before cold rolling or annealed it, and then the front and back surfaces of the sheet are ground with a belt-type grinding tool to remove flaws and surface. The method (hereinafter, referred to as belt grinding) for smoothing was adopted. In this belt grinding, the method of grinding the surface of the strip-shaped metal body with a rotary endless belt is mainly used, but this method has a low striping speed, requires a short belt life, and requires frequent belt replacement, so workability is low. bad.
That is, since the belt has a time-dependent grinding performance and the abrasive material wears over time, there is a problem that the surface quality after grinding changes with the grinding time. Further, since the grinding amount sharply decreases with the grinding time, the complicated work of exchanging the belt for each coil has been forced. In addition, there is a problem that uniform grinding cannot be performed unless the plate shape before grinding is flat.

The present inventors, in place of the belt grinding,
Using a roll type grinding tool having high efficiency and high workability (hereinafter referred to as a grinding roll), a manufacturing process capable of obtaining a strip-shaped metal body having an excellent surface property without uneven gloss was examined. The roll-type grinding tool is capable of highly efficient grinding because the abrasive grain material, which is worn by itself, falls off and new abrasive grain material comes out in its place, so that the grinding performance has very little time dependency. In addition, since the tool is a roll type, its replacement can be automated, and it has a longer life compared to the belt type, which improves workability and has a high practical value.

The use of roll-type grinding tools for grinding steel strip surfaces is not new. For example, Japanese Patent Laid-Open No. 3-86318 discloses a facility for removing surface flaws on a stainless steel strip by arranging an elastic grinding device (roll type) and a belt grinding device in a subsequent stage in combination. As long as the device is used, the above problems cannot be solved. Further, Japanese Patent Laid-Open No. 1-273607 discloses a method of grinding the surface of a steel strip by using a first grinding roll and a second grinding roll in which abrasive grain counts are successively increased. The purpose is to reduce the load of pickling after that by performing grinding up to the grading with a grinding roll, and also in this publication and the above publication, good surface properties of the material to be treated are obtained by adjusting the grinding direction of the grinding tool. I have no intention.

[0007]

When a strip-shaped metal body is ground by a laminating type grinding roll, a grind is formed in the traveling direction of the strip-shaped metal body, which causes unevenness of the surface of the product. Grinding rolls with an angle of inclination were used to eliminate the occurrence of conspicuous grinding eyes, but the dynamic balance of the roll is deteriorated by tilting the grindstone, and grinding unevenness that synchronizes with the rotation of the grindstone, that is, Surface profile defects called chatter marks tend to occur, especially in heavy grinding. Chatter marks are undulations that occur in a substantially linear shape at right angles to the grinding direction and have a certain pitch in the grinding direction. When this occurs, when the product is subjected to cold rolling and / or annealing in the subsequent steps, there is a problem that periodic gloss unevenness occurs in the rolling direction and the surface quality of the product deteriorates. The present invention is intended to solve such a problem of the present situation, and by adjusting the grinds using a laminating type grinding roll having different grindstone directions, grinding marks and chatter are formed on the surface of the strip-shaped metal body. It is an object of the present invention to provide a belt-shaped metal body grinding apparatus capable of preventing the generation of marks as much as possible.

[0008]

In order to achieve the above object, the present invention is an apparatus for continuously grinding a strip-shaped metal body by arranging a plurality of laminating type grinding rolls, and a straight type grinding roll is provided in the preceding stage. The gist of the present invention is a grinding device for a strip-shaped metal body, which is used and is provided with an inclined type grinding roll in the latter stage.

[0009]

The present invention will be described in detail below. When grinding a strip-shaped metal body, in the grinding using the same laminating type grinding roll, chatter marks are apt to occur in synchronization with the residual or rotation of the ground lines. There are various possible causes of these occurrences,
It was also considered to use an inclined type grinding roll, but it was considered difficult to improve both grinding residue and chatter marks at the same time. The present invention focuses on being affected by a front grinding surface in grinding with a grinding roll of the same form, and when a plurality of grinding rolls are arranged, in order to obtain a good grinding surface without chatter marks in the preceding stage, Grinding is performed with a straight type grinding roll, and the grinds generated by this grinding are removed by using an inclined type grinding roll in the subsequent stage. If the amount of eccentricity that causes chatter marks, the roundness of the whetstone, the vibration, etc. are the same, the amount of grinding and the depth of chatter marks are proportional. Usually, the latter stage has fine meshes and a small grinding amount, so chatter marks are also small.

FIG. 1 schematically shows the grinding apparatus of the present invention, in which a plurality of laminated-type grinding rolls 2, 3, 4, 5 are arranged in the traveling direction of the strip-shaped metal body 1. That is, the laminating type grinding roll is a roll in which discs 6 coated with abrasive grains are laminated to form a roll, and a straight type grinding roll in which the discs 6 are arranged and laminated in the preceding stage so as to be orthogonal to the roll axis. 2 and 3 are installed, and after that, inclined type grinding rolls 4 and 5 in which a disk 6 is laminated obliquely with the roll axis are provided. With the straight type grinding rolls 2 and 3, the strip-shaped metal body 1 varies depending on its type, but is 10 μm or more, preferably 30 μm or more.
Heavy grinding is performed for μm or more to remove surface scales and flaws, but at the same time, grinding marks are generated in the traveling direction of the surface of the strip-shaped metal body 1 as shown in FIG. At this time, chatter marks can be suppressed from occurring if the dynamic balance is kept uniform in each roll. In the grinding with the inclined type grinding rolls 4 and 5, the grinding marks 6 generated in the preceding stage are leveled and the result shown in FIG.
As shown in (b), the slanted and relatively flat grinding lines 7 are formed. That is, the grinding amount by the grinding rolls 4 and 5 here needs to be relatively small, so that the occurrence of chatter marks is suppressed. As shown in FIG. 3, these grinding rolls 2 to 5 are paired with a presser roll 8, and a breaker roll 9 is provided at the front and rear.

Although four grinding rolls are installed in the figure, the number of stands is not particularly limited, and a plurality of stages can be provided according to the need of processing, and an inclined type grinding roll is provided at least in the final stage. It is necessary to arrange them, and it is preferable that finer abrasive grains are provided on the rear side than the front side. Further, it may be provided on both front and back surfaces of the strip-shaped metal body.

[0012]

[Examples] A strip-shaped metal body was subjected to in-line grinding under the conditions shown in Table 1, the surface quality after the blast cutting and the quality of the cold rolled annealed product were investigated, and the results are also shown in Table 1. In this table, chatter mark height was measured by measuring the roughness in the longitudinal direction using a roughness meter. As the grinding amount, the weight before and after the treatment was measured, and the removed thickness was calculated from the specific gravity. The surface roughness is obtained by taking a sample after each treatment and measuring it in the plate width direction with a roughness meter to obtain the maximum roughness Rma.
We used x. The descale evaluation was performed as follows. ◯: No scale remains and no surface flaws. Δ: No scale remains, but surface flaws remain. X: Scale and surface flaws remain. The surface quality of the cold-rolled and annealed product was evaluated by 6 ranks of special A and AE according to the degree of uneven gloss, and B rank or higher was passed. Cold rolling conditions and annealing conditions were normal conditions.

As is clear from this table, the evaluation results of the strip-shaped metal bodies treated by the method of the present invention are all good. That is, descale and surface flaws are sufficiently removed, the surface roughness Rmax can be made small and the surface is flattened, and chatter marks are suppressed to 10 μm or less, and the surface gloss of the cold rolled annealed product becomes B rank or more. As a result, extremely excellent surface properties were obtained.

[0014]

[Table 1]

[0015]

[Table 2]

[0016]

As described above, according to the present invention, a belt-shaped metal body is ground by a device in which a straight type grinding roll and an inclined type grinding roll are arranged in front of and behind a processing line, thereby leaving a grinding residue. It is possible to suppress the occurrence of chatter marks and chatter marks, and it is possible to manufacture a strip-shaped metal product having an excellent surface property without uneven gloss.

[Brief description of drawings]

FIG. 1 is an explanatory view schematically showing a device of the present invention.

2 (a) and 2 (b) are views showing the condition of the ground stitches on the surface of the metal strip.

FIG. 3 is an explanatory view of a grinding roll of the present invention.

[Explanation of symbols]

 1: band-shaped metal body 2, 3: straight type grinding roll 4, 5: inclined type grinding roll 6: disc 7: grinding mark 8: presser roll 9: breaker roll

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takahiro Fujiwara 3434 Shimada, Hikari City, Yamaguchi Prefecture Inside the Nippon Steel Corporation Hikari Works (72) Inventor Fumio Futio, Fumio, Yamaguchi Prefecture 3434 Shimada, Hikari City, Yamaguchi Prefecture New Japan Inside the Hikari Steel Works, Ltd. (72) Inventor Yoshifumi Takai 3434 Shimada, Hikari City, Yamaguchi Prefecture Inside Nippon Steel Works, Hikari Steel Co., Ltd.

Claims (1)

[Claims] 1. An apparatus for continuously grinding a strip-shaped metal body by arranging a plurality of laminating type grinding rolls, a straight type grinding roll is used in the preceding stage, and an inclined type grinding roll is arranged in the latter stage. A grinding machine for strip-shaped metal bodies.