JPH0691530A - Automatic dressing method and device for roller shape grinding tool - Google Patents

Abstract

PURPOSE:To enable highly efficient grinding by bringing the dresser edge neer to the surface of a grinding tool for a belt-like metallic body for detecting contact between both, finding circularity of the tool while using the contact point as a reference, and sending the dresser edge forward after a cutting quantity is determined so that prescribed circularity can be obtained. CONSTITUTION:A dresser 19 is moved forward to a grinding roller 1 by a guiding device 13, and the dresser edge 22 is contacted with the grinding roller 1, and contact is detected by a vibration sensor 23. A sound caused by the contact between both is detected by an acoustic sensor 24. Circularity S is found according to an equation I and an expression II by using a distance (r2) between the rotation center of the roller 1 and the dresser edge 22 at this time, a distance (r1) between the rotation center of the roller 1 and a surface of a belt-like metallic body, a grinding load F of the roller 1 and the ratio K of a radial directional disto tion quantity caused by elastic deformation to this grinding load, and a cutting quantity C is set from it and target circulariry E. The dresser edge 22 is sent forward according to this cutting quantity C, and grinding is carried out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic dressing method and apparatus for a roll-shaped grinding tool for preventing deviation of the rotation of the grinding tool from a perfect circle during surface grinding of a band-shaped metal body having a scale. Is.

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 coil that is wound up.

[0003]

2. Description of the Related Art In the process of manufacturing a strip-shaped metal body, heating of the slab and subsequent hot rolling, continuous casting of thin-walled slab, or the like, or further annealing or annealing and pickling, causes oxide scales or scales 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 demands, conventionally, a band-shaped metal hot-rolled sheet before cold rolling or after annealing it, 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 used. In this belt grinding, a method of grinding the surface of the strip-shaped metal body by a rotary endless belt is mainly used, but this method has a low plate passing speed, has a short belt life, and requires frequent belt replacement, so workability is low. bad.
In other words, the belt has a time-dependent grinding performance, and the abrasive grain material wears with the lapse of time, so that there has been a problem that the surface quality after grinding varies 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. Moreover, 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 above belt grinding,
The manufacturing process that can obtain a strip-shaped metal body having excellent surface quality without uneven gloss using a roll type grinding tool having high efficiency and high workability was examined.
The roll type grinding tool self-generates the worn abrasive grain material, and instead a new abrasive grain material comes out, so that the grinding performance has very little time dependency and highly efficient grinding is possible. Also, since the tool is a roll type,
The replacement can be automated, and it has a longer life compared to the belt type, improving workability and high practical value.

The use of roll-type grinding tools for grinding steel strip surfaces is not new. For example, Japanese Unexamined Patent Publication No. 3-86318 discloses a facility for performing surface flaw removal on a stainless steel strip by arranging an elastic grinding device (roll type) and a belt grinding device in the subsequent stage in combination, but belt grinding is disclosed. 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 using a first grinding roll and a second grinding roll whose abrasive grain counts are successively increased. It is intended to reduce the load of pickling afterwards by performing grinding with a grinding roll, and also in the publication and the publication described above, good surface quality of the material to be treated is obtained by mechanical improvement of the grinding tool. I have no intention.

[0007]

In a roll type grinding tool, surface profile defects called chatter marks, which are considered to be caused by the shape of the grinding roll, are likely to occur. This is a undulation that occurs almost linearly at right angles to the grinding direction and has a certain pitch in the grinding direction. When this mark is generated, if 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 is deteriorated. Such gloss unevenness seen periodically in the rolling direction is largely affected by the deviation of the grinding roll rotation from the true circle,
And it is necessary to know this deviation accurately.

The present invention solves the above problems at present,
In addition, it can meet the demands, and it is possible to accurately adjust the shape of the roll type grinding tool used for grinding online, and chatter marks are generated on the surface of the band-shaped metal body without lowering productivity. It is an object of the present invention to provide an automatic dressing method and device for a roll-shaped grinding tool that can prevent the occurrence of damage as much as possible.

[0009]

In order to achieve the above object, the present invention has the following structures. That is, (1) a dresser blade tip is brought close to the surface of a rotating roll-shaped grinding tool arranged in a grinding treatment line for a strip-shaped metal body, contact between the tool and the dresser blade tip is detected, and with this contact point as a reference, The roundness of the roll-shaped grinding tool is determined, the cutting amount is determined so that the value of the roundness becomes a predetermined roundness, the dresser blade tip is fed, and the grinding tool is ground. Automatic dressing method for rolled grinding tools. And (2) a dresser blade tip is brought close to the surface of a rotating roll-shaped grinding tool arranged on a strip metal line grinding processing line, contact between the tool and the dresser blade tip is detected, and the roll is based on this contact point. The roundness S of the circular grinding tool is obtained by the following equation (1), and the necessary depth of cut C is obtained by the following equation (2) so that the value of S does not exceed 2000 μm. The dresser is divided into one or more times. An automatic dressing method for a roll-shaped grinding tool, which comprises feeding a cutting edge to grind the grinding tool. S = 2 {r ₂ − (r ₁ + F / k)} ………………………… (1) S−E ≦ C ≦ S ………………………… (2) Where S: roundness of the roll-shaped grinding tool r ₁ : distance between the rotation center of the roll-shaped grinding tool and the surface of the strip-shaped metal body r ₂ : the roll-shaped grinding tool when the dresser blade edge and the roll-shaped grinding tool come into contact Distance between center of rotation and dresser blade edge F: Grinding load of roll-shaped grinding tool k: Ratio of grinding load of roll-shaped grinding tool and radial strain due to elastic deformation E: Target circularity C: Depth of cut ( 3) A guide device provided with a guide rail engaging with the guide rail and a lateral feed moving device for moving along the axial direction of the roll-shaped grinding tool is supported on the support member having the guide rail attached thereto. , Dresser with grinding blade at the tip and roll the dresser The dressing apparatus having a feed mechanism for advancing and retracting in a radial direction of the grinding tool is fixed to the dresser, or an automatic dressing device of a roll grinding tool, characterized in that they have installed the detector near the.

In the present invention, as the means for detecting the contact between the grinding tool and the dresser, any one of a vibration detector, an acoustic detector, a pressure sensor and a gas type contact detector may be used, and these are installed directly on the dresser. Or place it near it. In the present invention, in order to suppress the occurrence of chatter marks that cause periodic gloss unevenness in the product after cold rolling, the roundness of the roll-shaped grinding tool is 2000.
Dressing to be within μm can be a tentative goal.

[0011]

The present invention will be described in detail below. One of the possible causes of chatter marks that occur in synchronization with the rotation of the grinding roll when grinding a strip-shaped metal body using a roll-type grinding tool (hereinafter referred to as the grinding roll) There is a deviation (roundness). for that reason,
Correcting the roundness online to keep the tool in good condition will prevent chatter marks. As shown in FIG. 1, the roundness of the grinding roll is the difference (S) between the radius of the inscribed circle and the circumscribed circle concentric with the rotation center of the grinding roll 1, that is, the deviation from the perfect circle. If so, the amount of grinding cut of the strip-shaped metal body is changed by the rotation, and chatter marks are generated. In order to prevent the occurrence of chatter marks, the roundness of the grinding tool must always be kept below a certain amount. For that purpose, the deviation S is measured and the dresser 2 is used as shown in FIG. A predetermined amount is cut in the radial direction of the grinding roll 1 which is paired with the pressing roll 3, and the predetermined cut amount is ground along the axial direction. The dresser cut amount into the grinding roll 1 is based on a generally adopted method, that is, based on the distance r ₁ (r ₁ = h−r ₃ −t) between the rotation center of the grinding roll 1 and the surface of the strip-shaped metal body 5. The cut amount will not be accurate if decided by. Since the grinding roll 1 is an elastic grindstone, the elastic coefficient k is changed by the grinding load F.
This is because Δr ₁ = F / k is elastically deformed, and r ₁ has a value changed by this grinding load. Therefore, in order to determine the depth of cut, it is desirable to directly detect the radius r ₂ at the dressing point of the grinding roll.

In order to directly detect the radius of the grinding roll, a means for bringing the tip of the dresser close to the surface of the grinding roll and detecting the vibration or sound generated when the tip of the dresser comes into contact with the surface of the grinding roll with a sensor, With this point as a reference point, the distance to the center of rotation of the grinding roll may be obtained. When the surface of the grinding roll is subjected to non-uniform wear defined by the circularity S described above, the tip of the dresser blade contacts at the position where the distance between the center of the grinding roll and the surface is the maximum. The distance at this time is r _2, and the minimum value of the distance between the center of the grinding roll and the surface is r _min . If the average radius of the grindstone is r _m , the uneven wear amount is considered to be a normal distribution, so r _m , r
₂ and r _min are expressed by the following equation (3). r _m = (r ₂ + r _min ) / 2 …………………… (3) Also, the relationship between r _m and r ₁ during grinding with the grinding load F is expressed by the following formula (4). . _{r 1 = r m -Δr 1 =} r m -F / k ................................. (4) Accordingly deviation S can be expressed by the following equation (5). S = r _max −r _min = 2 (r _max −r _m ) = 2 (r ₂ − (r ₁ + Δr ₁ )) = 2 (r ₂ − (r ₁ + F / k)) (5) Therefore By using the equation (1), the dresser cutting amount C can be determined so that the roundness S is equal to or less than a predetermined value. r ₂ is geometrically determined from the positional relationship between the grinding roll 1 and the cutting edge 22 of the dresser. r ₁ is geometrically determined from the positional relationship between the backup, the entrance side plate thickness and the grinding roll. F is calculated from a load cell or motor torque. k is measured in advance for the grinding roll.

FIG. 3 shows an example of the dressing equipment of the present invention, which has breaker rolls 4 on the upstream side and the downstream side and forms a pair with the pressing roll 3 to form a strip-shaped metal body 5.
Is disposed near the grinding roll 1 for grinding. In the figure, 6 is a support member fixed to an upper structural member 7 such as a beam, and guide rails 8 extending in the axial direction of the grinding roll are provided on the lower side wall and the lower wall surface. A reel 9 is supported by the support member 6 and has a transfer ball screw 10 fixed thereto. The reel 9 is connected to a drive motor 11 fixed to the support member 6 by a chain 12. Reference numeral 13 is a guide device provided with a guide shoe 14 that engages and grips the guide rail 8 and moves along the guide rail 8, and the transfer plate 1 screwed with the ball screw 10.
5 is fixed. The transfer plate 15 moves the guide device 13 by the rotation of the ball screw 10, that is, can be reciprocated in the axial direction of the grinding roll 1 while being guided by the rail 8. A dressing device 16 is fixed to the guide device 13, and is provided with a transfer device 18 that is connected to the cutting drive motor 17 and a dresser 19 that faces the grinding roll 1. The transfer device 18 has a ball screw 21 for cutting fixed to a gear 20, and a dresser 19 connected to the ball screw 21 is moved to the grinding roll 1 by the power transmitted from the motor 17 so as to be able to move forward and backward in the horizontal direction. The dresser 19 has a dressing cutting edge 22 at the tip and a vibration sensor 23 is attached to detect and transmit the vibration generated by the contact between the grinding roll 1 and the cutting edge 22. An acoustic sensor 24 is provided in the vicinity of the grinding roll and detects and transmits a contact sound generated by the contact between the grinding roll 1 and the cutting edge 22. Although not shown, a pressure sensor is provided at the rear end of the dresser and detects and transmits a load change of the dresser caused by the contact between the grinding roll 1 and the cutting edge 22. In addition, the gas type sensor has a hole in the center axis of the dresser to allow a gas to flow and the grinding roll 1
The change in gas pressure or gas flow rate generated by the contact between the blade 22 and the blade 22 is detected and transmitted. Only one of these sensors may be installed.

With such a device, when a deviation S from a perfect circle is formed on the grinding roll 1 during grinding of the strip-shaped metal body, the guide device 13 moves the dresser 19 to a predetermined position in the axial direction of the grinding roll. Then, the vibration of the dresser 19 caused by the contact at the point where the distance between the blade edge 22 and the roll rotation center becomes the maximum is advanced by advancing to a position where the blade edge 22 of the dresser 19 and the surface of the grinding roll 1 having a deviation are brought into contact with each other. To detect. When the distance between the cutting edge 22 and the center of the grinding roll 1 at this time is r ₂ , r ₂ is the maximum radius r _max of the dressing roll (grinding roll 1). On the other hand, the radius r of the dressing roll (corresponding to the average radius when regarded as a perfect circle) changes in a pattern as shown in FIG. The whetstone finished with a radius of r _i +0 by the i-th dress has a non-uniform wear in the whetstone as the grinding progresses, resulting in uneven radius in the circumferential direction (decrease in circularity) and radius in the width direction. Non-uniformity occurs. Of these, since the roundness promotes chatter marks, it is based on predetermined management criteria (grinding time, grinding length, grindstone wear, roundness, etc.) that are related to the quality that was obtained in advance. As a result, Δr _{i + 1} is dressed, and the radius is r _{i + 1,0} . The depth of cut at this time may be determined by using equation (1) from r ₁ , r ₂ , F, and k, and controlling so as to scrape off this S.

In order to prevent periodical gloss unevenness from occurring on the surface of the product after cold rolling, the chatter marks formed on the ground surface of the strip-shaped metal body must not have a predetermined height. FIG. 5 shows SUS304 and 430.
Hot-rolled steel strip and thin cast steel strip Hot-finished steel strip (3 mm thick)
Of the chatter mark on the ground surface when the surface was ground with a roll-type grinding tool, and then the rolling reduction was 5
It shows the relationship with the periodic gloss unevenness (indicated by rank, B and above is in the acceptable range) observed in the rolling direction when cold rolling at 0%, and the chatter mark height is 30 μm.
If it exceeds, the gloss unevenness which is periodic in the rolling direction corresponding to the pitch of chatter marks becomes remarkable (C rank or less), and the product surface fails. The preferred range of chatter mark height is 10 μm or less.

FIG. 6 shows hot rolled steel strips (3 mm thick) of hot rolled steel strip and thin cast steel strip of stainless steel (SUS304 and 430), Ti, Fe--Ni alloy, Fe--Cu alloy,
This chart shows the relationship between the height of the chatter mark on the ground surface and the roundness of the grinding tool when surface grinding is performed with a roll-type grinding tool. It can be seen that the roundness should be 2000 μm or less in order to obtain the thickness of 30 μm or less. More preferable results are obtained when the roundness is 500 μm or less.

As described above, by incorporating a roll-type grinding tool in the grinding processing line for strip-shaped metal bodies and correcting the roundness by the online dressing of the present invention, a product having excellent surface properties can be obtained. . In addition,
The roll-type grinding tool used in the present invention is an elastic grindstone roll having a certain degree of elasticity in order to easily conform to the shape of the strip-shaped metal body, for example, a roll in which abrasive-coated discs are laminated. There are molded products (laminated type), molded products with flap wheels laminated in roll form (flap type), and nylon resin with abrasive grains integrally molded in roll form (integrated type). Any of these is available. Can be adopted.

[0018]

[Example] Surface quality (chat mark height) after polishing and lapping a band-shaped metal body by in-line grinding under the conditions shown in Table 1.
The quality of the cold rolled and annealed product was investigated, and the results are also shown in Table 1. In this table, the example of the present invention uses the radius r _{2 of the} unloaded point of the elastic grindstone, the radius r _{1 of the} grinding point, the grinding load F, and the strain amount ratio k in the radial direction due to the elastic deformation to calculate a true circle using the equation (1). The degree S is calculated, and the dresser is cut during grinding so as to match the target circularity E. In the comparative example, the target circularity E is set to more than 2000 μm, no detector is provided, or dressing is not performed during detection. The circularity of the dial gauge was measured with a device having a disk of φ15 mm fixed to the tip of the dial gauge, and the chatter mark height was measured with a roughness meter. Also,
The surface quality of the cold-rolled and annealed product was evaluated by 6 ranks of special A and A to E according to the degree of gloss, and B rank or higher was classified as 1 grade (pass). The conditions for cold rolling annealing after grinding 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, and in particular, the treatment with the chatter mark of 10 μm or less using a grinding roll having a small roundness. As for the material, the surface gloss of the cold rolled and annealed product became A or special A rank, and extremely excellent surface properties were obtained.

[0020]

[Table 1]

[0021]

[Table 2]

[0022]

As described above, according to the present invention, on-line dressing of a grinding roll can be accurately performed, and when a large number of strip-shaped metal bodies are continuously ground in a continuous processing line or the like. In addition, the state of the grinding tool can always be kept good, and it is extremely effective in preventing chatter marks. It also eliminates the uneven gloss that occurs periodically in the rolling direction, and has a good cold rolling property. You can get the product.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a roundness of a roll type grinding tool.

FIG. 2 is an explanatory diagram of online dressing of a roll type grinding tool.

FIG. 3 is an explanatory view showing an embodiment of an online dressing device of the present invention.

FIG. 4 is an explanatory diagram of a dressing pattern.

FIG. 5 is a diagram showing a relationship between chatter mark height and uneven gloss of a product.

FIG. 6 is a diagram showing a relationship between chatter mark height and roundness.

[Explanation of symbols]

 1 Grinding Roll 2 Dresser 3 Pressing Roll 4 Breaker Roll 5 Band Metal 6 Support Member 7 Upper Structural Material 8 Guide Rail 9 Reel 10 Transfer Ball Screw 11 Drive Motor 12 Chain 13 Guide Device 14 Guide Shu 15 Transfer Plate 16 Dressing Device 17 Drive Motor 18 Transfer device 19 Dresser 20 Gear 21 Ball screw for cutting 22 Blade edge 23 Vibration sensor 24 Acoustic sensor

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takeshi Tanaga 3434 Shimada, Hitsu-shi, Yamaguchi Pref., Nippon Steel Co., Ltd. Hikari Steel Works (72) Inventor Haruo Oguro 3434, Shimada, Hikari-shi, Yamaguchi Pref. Nippon Steel Co., Ltd.In the Hikari Steel Works (72) Inventor Fumio Fumio 3434 Shimada, Hikari-shi, Yamaguchi Prefecture New Nippon Steel Co., Ltd. In the Hikari Steel Works (72) Ina Masafumi Takai 3434 Shimada, Hikari-shi, Yamaguchi Prefecture Address Shinko Nippon Steel Co., Ltd.Hikaru Works (72) Inventor Kenji Naya 18 Kikshoin Miikemachi, Minami-ku, Kyoto-shi, Kyoto Prefecture (Japan) Nihon Special Research Institute Co., Ltd. (72) Kazuya Okawara Miai, Okazaki, Aichi Prefecture Town Shodozaka 30 Nisshinbo Co., Ltd. In Miai Koki Factory

Claims (7)

[Claims] 1. A dresser blade edge is brought close to the surface of a rotating roll-shaped grinding tool arranged in a strip metal body grinding processing line, contact between the tool and the dresser blade edge is detected, and this contact point is used as a reference. The roundness of the roll-shaped grinding tool is determined, the cutting amount is determined so that the value of the roundness becomes a predetermined roundness, the dresser blade tip is fed, and the grinding tool is ground. Automatic dressing method for rolled grinding tools. 2. A dresser blade tip is brought close to the surface of a rotating roll-shaped grinding tool arranged on a strip metal line grinding processing line, contact between the tool and the dresser blade tip is detected, and the contact point is used as a reference to determine the contact point. The roundness S of the roll-shaped grinding tool is calculated by the following equation (1), and the value of S is 2000.
An automatic dressing of a roll-shaped grinding tool, characterized in that the required depth of cut C is determined by the following formula (2) so as not to exceed μm, and the dresser blade tip is fed once or a plurality of times to grind the grinding tool. Method. S = 2 {r ₂ − (r ₁ + F / k)} ………………………… (1) S−E ≦ C ≦ S ………………………… (2) Where S: roundness of the roll-shaped grinding tool r ₁ : distance between the rotation center of the roll-shaped grinding tool and the surface of the strip-shaped metal body r ₂ : the roll-shaped grinding tool when the dresser blade edge and the roll-shaped grinding tool come into contact Distance between center of rotation and dresser blade edge F: Grinding load of roll grinding tool k: Ratio of grinding load of roll grinding tool and radial strain due to elastic deformation E: Target circularity C: Depth of cut 3. A support member to which a guide rail is attached,
A guide device provided with a guide shoe engaged with the guide rail and a lateral feed moving device for moving along the axial direction of the roll-shaped grinding tool is supported, and the guide device has a dresser having a grinding blade at its tip and the dresser. An automatic dressing device for a roll-shaped grinding tool, characterized in that a dressing device having a feed mechanism for advancing and retracting the roll-shaped grinding tool in the radial direction is fixed, and a detector is installed in the dresser or in the vicinity thereof. 4. The automatic dressing device for a roll-shaped grinding tool according to claim 3, wherein a vibration detector is installed on the dresser. 5. The automatic dressing device for a roll-shaped grinding tool according to claim 3, wherein an acoustic detector is arranged in the vicinity of the dresser. 6. The automatic dressing device for a roll-shaped grinding tool according to claim 3, wherein a pressure detector is arranged at the rear end of the dresser. 7. The automatic dressing device for a roll-shaped grinding tool according to claim 3, wherein a gas-type contact detector is arranged on the dresser.