JPH08281539A - Centering method for roll grinding machine - Google Patents

Abstract

PURPOSE: To accurately carry out centering even in the case of the existence of an eccentricity by regulating a movable shaft base as much as the sum of the difference of horizontal displacement at the right and left ends of a ground roll, the difference of radii at right and left ends in a horizontal plane including the center of a roll figure, and the difference at right and left ends of the horizontal eccentric quantities of a rotation center and of a figure center. CONSTITUTION: The horizontal components, e1 , e2 of the eccentric quantity from a roll rotation shaft of the circle center in the case where the shape of a roll near both the shaft ends of a ground roll is assumed to be a circle are computed by an eccentric quantity computing means 4 from relation between a rotary angle measured severally by a rotation detector 2 and a displacement gage 3 and the displacement from the locus of the tip of a rotary grinding wheel on the outer periphery of the roll. Correcting quantity L=(d2 -d1 )+(D2 -D1 )/2(e2 -e1 ) is computed on the above computed result. The movable shaft base 32 is moved as far as this correcting quantity to make the traverse direction of a wheel spindle stock parallel to the direction of the rotating shaft of the roll. In this expression, d1 and d2 are horizontal deflections of right and left ends of the roll to the locus of the tip of the grinding wheel, and D1 and D2 are the roll diameter at right and left ends.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is designed to traverse a grindstone base of a roll grinder in the axial direction of a roll to be ground and grind the outer peripheral surface of the roll to be ground with a rotary grindstone mounted on the grindstone base. The present invention relates to a centering method for a roll grinder that makes the rotation axis of a roll to be ground parallel to the traverse direction of a grinding wheel head when the rotation axis of the roll is not parallel to the traverse direction of the grinding wheel head.

[0002]

2. Description of the Related Art When a roll is grinded by a roll grinder, when the roll is mounted on the roll grinder, the rotation axis direction of the roll to be ground and the traverse direction of the grinding wheel head of the roll grinder coincide with each other. Otherwise, the outer diameter of the roll after grinding will be
The taper rolls are different at both shaft ends.
When the taper roll is rolled, the thickness of the rolled material becomes a defective rolling material that differs in the left and right directions in the width direction. Therefore, when the taper roll occurs, it is necessary to re-polish to eliminate the taper.

Therefore, when the roll is grinded by the roll grinder, it is necessary to match the rotational axis direction of the roll with the traverse direction of the wheel head in advance.

The main part of such a roll grinder is generally as shown in FIG. That is, the movable headstock 32 is arranged at a position facing the fixed headstock 31 fixed to the frame of the grinder so as to be separated by a certain distance in the axial direction of the roll. The movable headstock 32 is configured to be movable in a direction orthogonal to the roll axis by a centering adjustment device 33. Then, when the roll 34 is ground, the rotary shaft 35 of the roll 34 to be ground is fixed by the fixed headstock 31 and the movable headstock 32.
Support both ends of. Then, the grinding target roll 34 supported in this way is ground by the rotary grindstone 38 rotated by the grindstone rotating electric motor housed in the grindstone base 39. Since the grindstone base 39 is mounted on the moving mechanism 40 that moves on the rail 37 in the roll axis direction and is movable in the direction perpendicular to the roll axis on the moving mechanism 40, the rotary grindstone 38 is provided together with the grindstone base 39. It is configured to be able to move back and forth in a direction perpendicular to the axial direction of the roll to be ground 34.

When the roll 34 to be ground is ground by such a roll grinder, the wheel head 3 of the moving mechanism 40 is used.
9 is advanced to bring the rotary grindstone 38 into pressure contact with the roll outer peripheral surface 36 of the roll 34 to be ground. Then, the rotating grindstone 38 is rotated by the electric motor for rotating the grindstone,
Grinding is started while rotating the roll to be ground 34.

Further, the moving mechanism 40 is traversed along the rail 37 in parallel with the rotating shaft 35 of the roll 34 to be ground, and the entire outer peripheral surface of the roll 34 to be ground is ground.

As described above, when the roll to be ground 34 is ground, if the direction of the rotating shaft 35 of the roll to be ground 34 and the traverse direction of the moving mechanism 40 are parallel, the outer peripheral surface of the roll to be ground 34 is ground. 36 is uniformly ground with a predetermined grinding depth.

However, if the direction of the rotary shaft 35 of the roll to be ground 34 and the traverse direction of the moving mechanism 40 are not parallel, the outer peripheral surface 36 of the roll to be ground 34 has the rotary shaft 3
That is, a portion of the rotating shaft 35 near one end is ground shallowly, and a portion of the rotating shaft 35 near the other end is deeply ground. Therefore, a taper roll that adversely affects rolling is produced. In addition, if one end is ground to a predetermined depth, the other end will be ground to a depth greater than necessary, reducing the efficiency of grinding work and deteriorating the roll unit. Become.

In order to solve such a problem, when grinding the roll to be ground 34, an operation for making the direction of the rotary shaft 35 of the roll to be ground 34 parallel to the traverse direction of the moving mechanism 40 is performed. .

This operation is generally called centering, and a conventional centering device for this roll grinding machine is disclosed in Japanese Patent Laid-Open No. 3-294158. As shown in FIG. 3, the automatic centering device of the roll grinder is configured so that each end of each shaft 35 of the roll to be ground 34 is fixed to the fixed headstock 3.
1 and a movable headstock 32, and a roll for grinding the outer peripheral surface 36 of the ground roll 34 with a rotary grindstone 38 mounted on a grindstone base 39 traversing the shaft 35 of the ground roll 34 in parallel. In the automatic centering device of the grinder, while adjusting the position of the grindstone base 39 and grinding the outer peripheral surface 36 of the roll 34 to be ground with the rotary grindstone 38 to a constant depth, the grindstone base 39 is used as the shaft 35. Constant current grinding traverse processing means for traversing in parallel, and the grinding roll 34 of the grindstone base 39 at two axially separated positions in the constant current grinding traverse processing process.
Center misalignment amount calculating means for calculating the misalignment amount of the grinding roll 34 from each moving position in the direction, and the position adjustment of the movable headstock 32 based on the misalignment amount calculated by the misalignment amount calculating means. And a position adjusting means for adjusting the position of the grinding wheel base 39 after being adjusted by the position adjusting means while cutting the outer peripheral surface 36 of the grinding roll 34 with the rotating grindstone 38. The grindstone 39 is attached to the shaft 35
And a fixed position grinding traverse processing means for traversing in parallel with.

[0011]

However, the above-described conventional automatic centering device for the roll grinder has the following problems. In other words, if the right and left ends of the roll to be ground have different outer diameters, or if the center of the roll shape and the center of rotation are different, that is, if there is eccentricity, correct centering is performed for the following reasons. I can't. (1) When the right and left ends of the roll to be ground have different outer diameters, the direction along the conical surface formed by the difference between the left and right outer diameters is mistakenly recognized as the direction of the rotation axis. (2) If there is eccentricity, the roll misalignment amount at each traverse position of the grinding wheel stand differs depending on the rotation position of the roll. Therefore, the roll misalignment amount at each traverse position of the grinding wheel stand must be uniquely obtained. I can't.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and the outer diameters of the right and left ends of the roll to be ground are different from each other, or the center of the roll pattern is different. It is an object of the present invention to provide a centering method for a roll grinder that allows accurate centering even when the center of rotation is different, that is, when there is eccentricity.

[0013]

A centering method for a roll grinder according to the present invention is a rotary grindstone in which both shaft ends of a roll to be ground are supported by a fixed headstock at one end and a movable headstock at the other end. In a roll grinder that grinds the outer surface of the roll to be ground while traversing the whetstone mount that is parallel to the rotation axis of the roll to be ground, after initial setting of the roll to be ground, the left end and the right end of the roll to be ground The difference in the horizontal component of the displacement from the tip reference locus, the difference in the radius between the left end and the right end of the roll to be ground in the horizontal plane including the center of the roll to be ground, and the horizontal direction of the center of rotation and the center of the roll to be ground The difference between the left end and the right end of the amount of eccentricity is obtained, and the movable headstock is adjusted by the sum of these amounts.

Further, as a preferable method thereof, a method of obtaining the amount of eccentricity in the horizontal direction between the center of rotation of the roll to be ground and the center of the figure is performed by rotating the roll to be ground and measuring the displacement of the surface of the roll to be ground. It is characterized in that the position of the figure center of the roll to be ground is determined on the assumption that the cross section is a circle or an ellipse, and the horizontal component of the obtained position of the figure center and the displacement of the rotation center is the eccentric amount.

[0015]

The roll to be ground is supported at one end by the fixed headstock and at the other end by the movable headstock. When traversing the grindstone to grind the outer peripheral surface of the roll to be ground, the grindstone shown in FIG. It is necessary that the whetstone tip locus A at the time of traverse and the rotation axis D of the roll to be ground 34 are parallel.

Now, consider the arrangement as shown in FIG. Initially, the left end and the right end of the roll to be ground 34 are whetstone tip loci A.
On the other hand, they are deviated in the horizontal direction by d ₁ and d ₂ , respectively. Further, the roll diameters of the left end and the right end of the roll to be ground 34 in the horizontal plane including the center of the pattern to be ground are D ₁ , D ₂ respectively.
Is. Between the rotation axis D of the roll to be ground 34 and the graphic center C, there are eccentric amounts of e ₁ and e _{2 in} the horizontal direction at the left end and the right end of the roll to be ground 34, respectively.

In this case, when grinding the roll,
The movable headstock (the right end of the roll to be ground 34) is attached to the roll 3 to be ground.
By moving in the direction orthogonal to the rotation axis of No. 4 by the amount of L shown in the equation (1), the grindstone tip locus A and the rotation axis D of the grinding roll 34 become parallel.

L = (d ₂ −d ₁ ) + (D ₂ −D ₁ ) / 2 + (e ₂ −e ₁ ) ... (1) Of these, for d ₁ and d ₂ , dial gauges, etc. Can be measured by a known means, such as supporting the tool on a whetstone stand and moving the whetstone stand. Further, D ₁ and D ₂ can also be measured by a known means such as a micrometer. Therefore, if the eccentric amounts e ₁ and e ₂ of the rotation axis D and the center of the figure can be measured, the movement amount L can be obtained by the above equation (1).

A preferred example of the method for measuring e ₁ and e ₂ is shown in FIG.
Will be explained. Figure 5 is an explanatory view of a case of obtaining the amount of eccentricity e ₁ in FIG. 4 of the grinding roll 34, the eccentric amount e ₂
The same can be considered when seeking. In FIG. 5, the X axis indicates a horizontal axis including the rotation center O, and the Y axis indicates a vertical axis including the rotation center O. O'is the grinding roll 34
Is the center of the figure.

Now, the grinding roll 34 is rotated around the rotation center O, and the displacement of the surface of the grinding roll 34 is measured by a displacement measuring device on the X-axis to determine the rotation angle and the displacement of the surface of the grinding roll 34. When the relationship is plotted on the XY plane as the relationship between θ and r in the curved coordinates, a figure as shown in FIG. 5 is obtained (X axis is θ = 0). This figure is a circle or an ellipse when the cross section of the grinding roll 34 is a circle or an ellipse, respectively. Therefore, the obtained figure is approximated by a circle or an ellipse, and its center is O ′. Then, the eccentricity e
₂ can be obtained as the horizontal component of the distance between O and O ′. As a method of approximating the obtained figure with a circle or an ellipse, regression or other known methods can be arbitrarily selected and used. Regarding the approximation by a circle or an ellipse, if the cross section of the grinding roll 34 is considered to be substantially a circle, it may be approximated by a circle, and if it may be an ellipse, it may be approximated by an ellipse. Obviously, an ellipse may be used when it is regarded as a circle.

Referring to FIG. 5, the distance between the rotation center and the grindstone tip trace A is the horizontal _{direction, L 1 = d 1 + D} 1/2 + e 1 ............ (2) is shifted by. Similarly, in the other end, the distance between the rotation center and the grindstone tip trace A is the horizontal _{direction, L 2 = d 2 + D} 2/2 + e 2 ............ (2) is shifted by. Therefore, if the movable headstock is adjusted by L = L ₂ −L ₁ , the displacement amount at both ends becomes the same,
The roll rotation axis D and the whetstone tip locus A become parallel. By grinding the roll in such a state, grinding without eccentricity or taper can be performed.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of a centering device for a roll grinder used for carrying out the present invention will be described with reference to FIG.

In this roll grinder, both shaft ends of a roll to be ground 36 are supported by a fixed shaft base 31 at one end 35a and a movable shaft base 32 at the other end 35b. Grinding is performed by a rotating grindstone 38 mounted on a grindstone base 40 that traverses in parallel with the rotation axis of the roll 36 to be ground. The centering device includes outer diameter micrometers 1a and 1b for measuring the roll diameters in the vicinity of both axial ends of the roll in a horizontal plane including the roll figure center of the roll to be ground 36, and a roll to be ground with the horizontal plane having the roll diameter measured as a reference. 36
The relationship between the rotation detector 2 that measures the roll rotation angle in the vicinity of both shaft ends of the roll to be ground 36 when rotating the roll to be ground and the amount of displacement of the outer peripheral surface of the roll to be ground 36 in the horizontal plane from the tip of the rotating grindstone is shown. From the relationship between the displacement meter 3 to be measured, the rotation angle measured by the rotation detector 2 and the displacement meter 3, and the displacement amount from the tip of the rotating grindstone on the outer peripheral surface of the roll,
Eccentricity calculation means 4 for calculating the horizontal component of the eccentricity from the roll rotation axis at the center of the circle or ellipse, assuming that the roll shape in the vicinity of both axial ends of the roll to be ground is a circle or an ellipse. Movable headstock position correction amount calculation means 5 for calculating the position correction amount of the movable headstock 32, and movable headstock position for controlling the position of the movable headstock 32 by a command from the movable headstock position correction amount calculation means 5. The control means 6 and the movable headstock drive means 33 for driving the movable headstock 32 in response to a signal from the movable headstock position control means 6.

When the above-described automatic centering device for a roll grinder is used to center a roll to be ground, the roll figure center of the roll to be ground 36 is included by the outer diameter micrometers 1a and 1b. The roll diameters D ₁ and D ₂ near the ends of both rolls in the horizontal plane are measured and input to the movable headstock position correction amount calculation means 5. Then, the grindstone base 40 is traversed and the displacement gauge 3 is used to measure the horizontal components d ₁ and d ₂ of the displacement from the grindstone tip reference locus in the vicinity of both shaft ends of the roll to be ground, and the movable headstock position correction amount is calculated. Input to the means 5. Next, the roll 36 to be ground is rotated, and the rotation detector 2 and the displacement meter 3 measure the roll rotation angle and the displacement amount of the outer peripheral surface of the roll from the tip of the rotating grindstone, respectively, and input to the eccentricity amount calculation means 4, respectively. To do.

Then, the eccentricity calculating means 4 determines the roll shape in the vicinity of both axial ends of the roll to be ground from the relationship between the roll rotation angle and the displacement amount of the outer peripheral surface of the roll from the reference line in the axial direction of the roll. Horizontal components e ₁ , e ₂ of the eccentricity from the roll rotation axis around the center of the circle or ellipse assuming an ellipse
Is calculated, and the calculation result is input to the movable headstock position correction amount calculation means 5.

The movable headstock position correction amount calculation means 5 calculates the correction amount L by the equation (1) based on the input signal,
The result is input to the movable headstock position control means 6.

Then, the movable headstock position control means 6 sends a command to the movable headstock drive means 33 to correct the position of the movable headstock 32.

[0028]

According to the present invention, the traverse direction of the grinding wheel head and the direction of the rotation axis of the roll can be made exactly parallel to each other, so that the roll cylindricity after grinding can be improved and the grinding amount of the roll can be improved. Can be minimized, the efficiency of roll grinding work can be improved, and the roll unit can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of the configuration of a centering device for a roll grinder for carrying out the present invention.

FIG. 2 is an explanatory diagram of a main part of a roll grinder.

FIG. 3 is an explanatory view of a conventional automatic centering device for a roll grinder.

FIG. 4 is an explanatory diagram showing a necessary position correction amount of a roll to be ground in a roll grinder.

FIG. 5 is an explanatory diagram showing an eccentricity amount measuring method.

[Explanation of symbols]

 1a outer diameter micrometer 1b outer diameter micrometer 2 rotation detector 3 displacement meter 4 eccentricity amount calculation means 5 movable headstock position correction amount calculation means 6 movable headstock position control means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsuhiro Honbo, Marunouchi 1-2-2, Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Yoshiyuki Morita 1-2-1 Marunouchi, Chiyoda-ku, Tokyo Nihon Steel Pipe Co., Ltd. (72) Inventor Yuri Iizuka 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Steel Pipe Co., Ltd.

Claims (2)

[Claims] 1. A roll head to be ground is supported at one end by a fixed headstock and at the other end by a movable headstock, and a grindstone base on which a rotary grindstone is mounted is traversed parallel to the rotary shaft of the roll to be ground. While initializing the roll to be ground in a roll grinder that grinds the outer surface of the roll to be ground, the difference between the horizontal component of the displacement of the left end and the right end of the roll to be ground from the reference path of the grindstone tip, and the shape of the roll to be ground In the horizontal plane including the center, the difference in radius between the left end and the right end of the roll to be ground, and the eccentric amount in the horizontal direction between the center of rotation of the roll to be ground and the center of the figure,
A method for centering a roll grinder, wherein the difference between the left end and the right end is obtained, and the movable headstock is adjusted by the sum of these amounts. 2. A method for obtaining the horizontal eccentricity between the center of rotation of the roll to be ground and the center of the figure is to rotate the roll to be ground and measure the displacement of its surface to obtain a circle or an ellipse for the cross section of the roll to be ground. 2. The roll grinder according to claim 1, wherein the position of the center of the figure of the roll to be ground is obtained, and the horizontal component of the obtained position of the figure center and the displacement of the rotation center is used as the eccentric amount. Centering method.