JP2620269B2 - Grinding control method in roll grinder - Google Patents

Description

The present invention relates to a grinding control method in a roll grinder,
In more detail, in order to improve the processing accuracy at the end of the roll to be ground, by inputting and instructing the processing start point of the end of the roll to be ground, the moving pitch of the grinding tool after the processing start point is subdivided to improve the resolution. The present invention relates to a grinding control method in a roll grinder for raising and grinding.

BACKGROUND OF THE INVENTION Roll grinders for precisely grinding rolls used in rolling mills, papermaking machines, printing presses, etc., generally move a grinding wheel in a radial direction with respect to a roll rotating at a predetermined speed, and an axis line. It is configured to process the roll into a desired shape by moving the roll in a desired direction.

In a rolling mill, a desired plate material is formed by passing an ingot such as steel through a plurality of rolling steps. In this case, a rolling roll having a shape according to the processing content is used in each rolling step. Therefore, a roll grinder for forming such a roll is required to have a function of forming rolls of various shapes.

In view of this, some conventional roll grinders are configured to control the feed amount of a grinding wheel in the roll radial direction using an eccentric cam corresponding to the roll shape, and to form the roll into a desired shape. However, in this case,
In order to form rolls of various shapes, a large number of eccentric cams having complicated outer peripheral shapes corresponding to the roll shapes are required.

On the other hand, there is a roll grinder in which the rotation amount and the rotation speed of an eccentric cam are controlled by using a microcomputer or the like, and a roll having a plurality of shapes can be formed with only a single or a small number of eccentric cams. However, in this type of roll grinder, the feed pitch in the roll axis direction of the grinding wheel is constant, and the radial movement amount of the grinding wheel at each feed pitch, that is, the amount of rotation of the eccentric cam is calculated as grinding data.
The roll is processed into a cambering curve having a desired roll shape based on the grinding data. Here, when the grinding wheel reaches the end of the roll and grinds the end with a relatively large curvature, the amount of movement in the radial direction increases because the feed pitch in the axial direction is constant. Therefore, the grinding surface at the end of the roll becomes step-like, and there is a disadvantage that the processing accuracy at the end is reduced.

[Objects of the Invention] The present invention has been made to overcome the above-mentioned disadvantages, and is directed to a feed pitch of a grinding wheel after a starting point of processing an end of a roll to be ground (in a direction along an axis of the roll to be ground). To provide a grinding control method in a roll grinding machine that can improve the grinding accuracy at the end of the roll to be ground by calculating the radial movement amount of the grinding wheel by performing the machining operation by subdividing the feed pitch). Aim.

[Means for Achieving the Object] In order to achieve the above object, the present invention provides a method for moving a grinding wheel along the axis of a rotating roll to be ground and displacing the grinding wheel in a direction toward the roll to be ground. When obtaining a predetermined roll shape, a point where the roll shape of the roll to be ground changes by a predetermined amount is set in advance, and at the time when the grinding wheel approaches or reaches the point, along the axis of the grinding wheel. The feed pitch is changed from the feed pitch before approaching or arriving at the point and is set, and the displacement of the grinding wheel directed to the roll to be ground is controlled for each feed pitch to continue the grinding operation. It is characterized by.

[Embodiment] Next, a preferred embodiment of a grinding control method in a roll grinding machine according to the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 1, reference numeral 10 denotes a roll grinding system to which the grinding control method according to the present embodiment is applied. The roll grinding system 10 includes a roll shape data creating device 12 and a roll grinding machine control device as external processing devices. It is basically composed of 14 and a roll grinder 16.

The roll shape data creation device 12 is constituted by, for example, a commercially available personal computer, and a CRT 18, a keyboard 20, a printer 22, and a floppy disk drive 24 are connected to the roll shape data creation device 12. The roll shape data creation device 12 creates roll shape data as point cloud data based on a predetermined roll shape data creation program, and stores the same on a floppy disk 26 as an external storage medium via a floppy disk drive 24.

The roll grinder control device 14 drives and controls the roll grinder 16 based on the roll shape data, and details thereof will be described later. The roll grinder control device 14 is connected to an LED display 28, a keyboard 30, and a floppy disk drive 32 in which the floppy disk 26 is loaded.

The roll grinder 16 is for cutting a rolling roll 34, which is a workpiece, into a predetermined shape using a grinding wheel 36,
The rolling roll 34 has a headstock 38 and a tailstock
Backed by 40. The headstock 38 has a rolling roll
A roll rotation motor 42 for rotating 34 in the direction of arrow A shown in FIG. 2 is attached.

On the other hand, the grinding wheel 36 is configured to rotate in the arrow direction A similarly to the rolling roll 34 by a wheel rotating motor 44, and is supported by a mechanism shown in FIGS. 1 and 2. That is, a table 46 extending in the Z-axis direction is mounted on a side portion of the rolling roll 34, and a support table 50 is mounted on an upper surface portion of the table 46 via guide rails 48a and 48b. . In this case, the support table 50 is configured to be movable in the arrow Z direction (the axial direction of the rolling roll 34) by a ball screw 54 that is rotationally driven by a grindstone moving motor 52 attached to the end of the table 46. On the upper surface of the support table 50, a portion close to the rolling roll 34 is supported by a pivot 54 so as to be rotatable in the direction of arrow B, and a grinding wheel mount for holding a grinding wheel 36.
56 is installed. On the other hand, a portion of the upper surface of the support base 50 that is separated from the rolling roll 34 is provided with a lever
60 is supported rotatably in the direction of arrow C. On the upper surface of the lever member 60, rollers 62a and 6
2b is attached. In this case, an eccentric cam 66 rotated in the direction of arrow D by an eccentric cam rotation motor 64 is attached to the roller 62a.
Abuts. The roller 62b supports the lower surface of the grindstone mount 56 on the side separated from the rolling roll 34 via the roller 68. As a result, the grinding wheel 36 can be displaced in the arrow X direction (radial direction of the rolling roll 34) via the lever member 60 and the grinding wheel mount 56 by the rotation of the eccentric cam 66.

Next, the configuration of the roll grinder control device 14 will be described in detail with reference to FIG. Roll grinding machine controller 14 is host
The host CPU 70 is controlled by a CPU 70, which controls a common memory 76, a display controller 78, a keyboard interface 80, an output module 82, an input module 84, a D / A converter 86, and a pulse counter 88 via a bus line 72. And common memory
A floppy disk drive control CPU 74 is also controlled via 76. The floppy disk drive control CPU 74 controls the floppy disk drive 32 and reads the roll shape data created by the roll shape data creating device 12 via the floppy disk 26. The display controller 78 controls the LED display 28. The keyboard interface 80 processes data input from the keyboard 30 and transfers the data to the common memory 76 or the like via the host CPU 70. The common memory 76 stores the host CPU 70 based on the roll shape data transferred from the floppy disk 26 or the data from the keyboard 30.
The roll shape data created by the above is stored. The output module 82 outputs a drive signal for driving the roll rotation motor 42, the grinding wheel rotation motor 44, the grinding wheel moving motor 52, and the like to the roll grinding machine 16. The input module 84 receives a signal from a limit switch or the like of the roll grinder 16 and transfers the signal to the host CPU 70. D / A converter 86 is a servo driver that outputs control signals based on roll shape data.
90, and the servo driver 90
Drives and controls the grindstone moving motor 52 and the eccentric cam rotating motor 64 in accordance with this control signal. The pulse counter 88 counts pulse signals from an encoder (not shown) mounted on the grinding wheel moving motor 52 and the eccentric cam rotating motor 64, and transfers them to the host CPU 70. In this case, the host CPU 70 controls the roll shape data to be transferred to the D / A converter 86 based on the pulse signal.

The roll grinding system to which the grinding control method according to the present embodiment is applied is basically configured as described above. Next, the operation and effects thereof will be described.

The roll grinding machine control device 14 has a roll shape data generation program for grinding a roll having a relatively simple shape such as a sine shape, an R shape, and a taper shape. Then, the desired roll shape data is calculated within a range that can be created by the above, and stored in the common memory. When an operation command of the roll grinder 16 is input from a start push button or the like (not shown),
The host CPU 70 outputs a drive signal to the roll rotation motor 42 and the grindstone rotation motor 44 via the output module 82 based on the roll grinding program. As a result, the rolling roll 34 and the grinding wheel 36 are driven to rotate in the direction of arrow A. Further, a drive signal is output to the servo driver 90 via the D / A converter 86, and the grindstone moving motor 52 is driven to rotate. As a result, the ball screw 54 rotates, and the grinding wheel 36 starts moving in the arrow Z direction together with the support table 50.

On the other hand, the host CPU 70 outputs the roll shape data stored in the common memory 76 to the servo driver 90 via the D / A converter 86 as a drive signal. The servo driver 90 drives the eccentric cam rotation motor 64 based on the drive signal, and rotates the eccentric cam 66 in the direction of arrow D by a predetermined amount. In this case, since the lever member 60 is rotated by a predetermined amount in the direction of arrow C via the roller 62a by being pressed by the eccentric cam, the grindstone mount 56 is displaced in the direction of arrow B via the roller 62b and the roller 68. . Therefore, the grinding wheel 36 is displaced by a predetermined amount in the arrow X direction according to the amount of rotation of the eccentric cam 66. Note that the pulse counter 88
A pulse signal from an encoder (not shown) attached to the grinding wheel moving motor 52 and the eccentric cam rotating motor 64 is input to the host CPU 70.The host CPU 70 converts the roll shape data into a D / A converter 86 based on the pulse signal. , The displacement of the grinding wheel 36 in the direction of arrow X and the amount of movement in the direction of arrow Z are controlled.

In this case, usually, the grinding wheel 36 is moved at a constant pitch in the arrow Z direction, for example, at a pitch of 1 mm, the amount of rotation of the eccentric cam 66 for each movement pitch is calculated, and the displacement amount of the grinding wheel 36 in the arrow X direction is calculated. That is, the grinding amount for the rolling roll 34 is controlled. Therefore, rolls having various shapes as shown in FIG. 4 can be ground in accordance with the shape of the eccentric cam 66 and the amount of rotation of the eccentric cam 66 with respect to the amount of movement of the grinding wheel 36 in the Z direction.

FIG. 4 shows the shape of the roll 34 to be ground.
That is, it shows a cambering curve, the mechanical origin O of the roll grinder 16 is the center point of the rolling roll 34, the horizontal axis is the axial direction (Z axis) of the rolling roll 34, and the vertical axis is the rolling roll 34. It is taken in the radial direction (X axis). In this case, D on the vertical axis is called a crown amount, Q is a shape factor, and the rolling roll 34 having a parabolic shape when Q = O
The rolling roll 34 having a curved shape thicker than a parabola at> O is ground and the rolling roll 34 having a curved shape thinner than a parabola at Q <O. Therefore, by using the eccentric cam 66 having the shape factor Q designed according to the desired roll shape, the rolling roll 34 having a predetermined cambering curve can be ground.

Therefore, the displacement amount δ in the X direction at each moving position of the grinding wheel 36 in the Z direction is, for example, the roll grinding system 10 according to the present embodiment. Obtained by Here, θ is the rotation angle of the eccentric cam 66,
Z is the amount of movement of the grinding wheel 36 in the Z direction from the origin O, and B is the straight amount of the rolling roll 34 (the rolling roll 34 in FIG. 4).
, And U and V are a primary coefficient and a secondary coefficient determined by the roll grinder 16. in this case,
The rotation angle θ of the eccentric cam 66 in the above formula (2) is calculated by the CPU 70 in the roll grinding machine control device 14 according to the Z-direction movement amount ZN of the grinding wheel 36, and a control signal required for the roll grinding machine 16 is output. As a result, the rolling roll 34 having a desired curved shape is ground.

By the way, the straight portion of the rolling roll 34 calculates the rotation angle θ of the eccentric cam 66 at each moving position while moving the grinding wheel 36 in the Z direction at a pitch of 1 mm as described above, and
By controlling the amount of displacement δ in the X direction.
On the other hand, when the end of the rolling roll 34 is ground, the following inconvenience occurs. That is, in the grinding of the end portions of the rolling rolls 34 shown in FIG. 5 (R moiety a _1), by setting the Z direction feed pitch ΔZ of the grinding wheel 36 to the straight portion a ₂ the same pitch, of the grinding wheel 36 Since the amount of displacement in the X direction, that is, the amount of cut Δδ of the grinding wheel 36 is larger than the feed pitch ΔZ, the outer peripheral shape is stepwise as shown in the figure.

In order to solve this inconvenience, in this embodiment,
The starting point of the end (R part a ₁ ) of the rolling roll 34 shown in FIG.
It is specified on the input means the Z _R in advance roll grinding machine controller 14 keyboard 30 is connected to the like. Then, the host CPU7 when during grinding, the grinding wheel 36 has reached the starting point Z _R
0, the feed pitch in the Z direction is changed from a feed pitch of 1 mm in the straight portion to, for example, 0.1 pitch,
The displacement amount δ of the grinding wheel 36 in the X direction, that is, the rotation angle θ of the eccentric cam 66 is calculated every 0.1 mm, and a necessary control signal is output to each part of the roll grinding machine 16. As a result, the rolling roll 34
The resolution of the roll shape data at the end (R portion a ₁ ) can be increased, and as shown in FIG.
The grinding shape at the end of 34 can be smoothed accurately. In order to subdivide the feed pitch of the grinding wheel 36 at the end of the rolling roll 34, the Z
When decelerating the feeding direction velocity, it is preferable by performing deceleration control from a predetermined amount before relative to the start point Z _R that is input.

In the above-described embodiment, the case where the displacement amount of the grinding wheel 36 in the arrow X direction is controlled using the eccentric cam 66 has been described. However, the displacement amount may be controlled using a ball screw or the like. It is. In this case, the roll grinder control device 14 is configured to output a drive signal corresponding to the amount of rotation of the ball screw to a motor for displacing the grinding wheel 36 in the direction of the arrow X.

[Effects of the Invention] As described above, according to the present invention, the feed pitch of the grinding wheel is subdivided by only a simple operation of inputting the end start point of the roll to be ground, and the amount of movement of the grinding wheel in the roll radial direction is reduced. Can be controlled. Therefore, the grinding accuracy at the end of the roll to be ground is improved, and the forming accuracy of the roll to be ground can be significantly improved, and the roll to be ground having a desired cambering curve can be formed.

As described above, the present invention has been described with reference to the preferred embodiments. However, the present invention is not limited to these embodiments, and various improvements and design changes can be made without departing from the gist of the present invention. Of course.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a roll grinding system to which a grinding control method in a roll grinding machine according to the present invention is applied, and FIG. 2 is a main configuration of a roll grinding machine driven and controlled by the grinding control method according to the present invention. FIG. 3 is a block diagram illustrating a configuration of a grinding machine control device that implements a grinding control method according to the present invention. FIG. 4 is an explanatory diagram of a grinding shape of a roll to be ground. FIG. FIG. 6 is an explanatory view of a grinding state at an end of the roll, and FIG. 6 is an explanatory view of a grinding state at an end of the roll to be ground by the grinding control method according to the present invention. 10… Roll grinding system 12… Roll shape data creation device 14… Roll grinder control device, 16… Roll grinder 26… Floppy disk, 30… Keyboard 32… Floppy disk drive 34… Roll roll , 36… Grinding wheel 52, 64… Motor, 66… Eccentric cam 70… Host CPU 74… CPU for floppy disk drive control

Claims (1)

(57) [Claims] When a predetermined roll shape is obtained by moving a grinding wheel along the axis of a rotating roll to be ground and displacing the grinding wheel toward the roll to be ground, the roll shape of the roll to be ground is determined. A point at which a quantitative change is made is set in advance, and when the grinding wheel approaches or reaches the point, the feed pitch along the axis of the grinding wheel is changed from the feed pitch before approaching or reaching the point. And controlling the amount of displacement of the grinding wheel directed to the roll to be ground for each feed pitch to continue the grinding operation.