JP2004345054A - Method for grinding disc part - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for grinding a disc part that is applicable to workpieces of different widths by a rotary grinding wheel of a small width for reducing manufacturing cost of a grinding wheel. <P>SOLUTION: The grinding wheel 55 is moved from an inner part 21 positioned at a center of the disc part 13 to an outer part 22 positioned diametrically outward by feeding f to move (for traverse cut) as shown with an arrow 3. Rotation speed (rotation number n) of the disc part 13 is controlled in such a way that circumferential speed V of the disc part 13 as measured at a width center 56 of the grinding wheel 55 is constant. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a disk part grinding method for grinding the disk surface of a flange-shaped disk part by traverse cutting.
[0002]
[Prior art]
In a conventional method of grinding a disk portion, a grindstone having a width substantially equal to the width of the disk portion is attached to a grinding machine, and the disk portion rotating together with the workpiece is ground by the plunge cutting method using the grindstone. 1).
[0003]
[Patent Document 1]
JP-A-9-155703 (page 3, FIG. 1-2)
[0004]
Patent Document 1 will be described in detail with reference to the drawings.
8 (a) and 8 (b) are explanatory views of a conventional disk portion grinding method (reprinted illustration of FIG. 1 of Patent Document 1 is (a), and reprinted illustration of FIG. 2 is (b). .).
In the method of grinding a disk portion using the conventional grinding device 1, first, a rotating grindstone 10 is prepared. The rotary grindstone 10 is a grindstone whose width is substantially the same as the width of the tapered surface 7a of the work 6 and whose grinding surface 11 is inclined by α °. Next, the rotary grindstone 10 is attached to the grindstone drive motor 22, and then the tapered surface 7 a of the flange portion (disk portion) 7 of the work 6 is ground by the plunge cutting method on the grinding surface 11 of the rotary grindstone 10. . As a result, the tapered surface 7a of the flange portion (disk portion) 7 can be ground without the rotating grindstone 10 interfering with the tailstock 5.
[0005]
[Problems to be solved by the invention]
However, in the disk portion grinding method using the grinding device of Patent Document 1 shown in FIG. 8 described above, the width of the rotary grindstone 10 needs to correspond to the tapered surface 7a of the flange portion (disk portion) 7, and the work If the grindstone width is set for each of the widths, the production cost of the grindstone increases. In particular, in the case of a CBN grinding wheel, the manufacturing cost is proportional to the width of the grinding wheel.
In addition, a grindstone having a predetermined inclination angle formed on the grinding surface 11 of the rotary grindstone 10 must be employed, and the production cost of the grindstone increases.
Further, when grinding is performed with the rotating grindstone 10, grinding oil is supplied. However, the grinding oil hardly reaches the center of the width of the rotating grindstone 10, and the temperature of the work increases, which easily causes burning.
[0006]
Therefore, an object of the present invention is to provide a disk portion grinding method that can reduce the manufacturing cost of a grinding wheel.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, claim 1 is a grinding method for grinding a disk surface of a disk portion with a rotary grindstone while rotating the disk portion with a workpiece having a disk portion being processed. The width of the wheel is set smaller than the width of the disk surface, and the rotating grindstone is moved from the center of the disk part to the outside or from the outside to the center, and the relative grinding speed measured at the center of the width of the rotating wheel is constant. It is characterized in that both or one of the rotation speed of the disk portion and the rotation speed of the rotary grindstone is controlled so that
[0008]
In the grinding method for controlling the rotation speed of the disk, the relative grinding speed is the peripheral speed of the disk. By continuously changing the rotation speed of the rotating disk portion, the relative grinding speed of the disk portion measured at the center of the width of the rotating grindstone becomes constant outside the center of the disk portion. As a result, when performing a traverse cut in which the rotating grindstone is moved radially outward from the center of the disc portion, the center of the width of the rotating grindstone always grinds the disc surface of the disc portion under the same conditions. Even if the width of the rotary grindstone is set smaller than the width, the disk surface of the disk portion can be finished within a desired tolerance. Therefore, it is possible to cope with a work having a different width by using a rotating grindstone having a small width, and it is possible to reduce the manufacturing cost of the grindstone.
[0009]
In the grinding method for controlling the rotation speed of the rotating grindstone, the relative grinding speed is a relative speed between the peripheral speed of the disk portion measured at the width center of the rotating grindstone and the peripheral speed of the rotating grindstone. Since the rotation speed of the rotating grindstone is continuously changed without changing the rotation speed of the disk portion, the relative grinding speed is constant outside the center of the disk portion. As a result, when performing a traverse cut in which the rotating grindstone is moved radially outward from the center of the disc portion, the center of the width of the rotating grindstone always grinds the disc surface of the disc portion under the same conditions. Even if the width of the rotary grindstone is set smaller than the width, the disk surface of the disk portion can be finished within a desired tolerance.
[0010]
It controls both the rotation speed of the disk portion and the rotation speed of the rotating grindstone. Since both of these rotation speeds are continuously changed, the relative grinding speed is constant outside the center of the disk portion and radially outward. As a result, when performing a traverse cut in which the rotating grindstone is moved radially outward from the center of the disc portion, the center of the width of the rotating grindstone always grinds the disc surface of the disc portion under the same conditions. Even if the width of the rotary grindstone is set smaller than the width, the disk surface of the disk portion can be finished within a desired tolerance.
[0011]
Claim 2 is a grinding method in which a workpiece having a disk portion is processed, and the disk surface is ground with a rotary grindstone while rotating the disk portion. Set the width smaller than the width, move the rotating grindstone from the center of the disc to the outside or from the outside to the center, and keep the relative grinding speed measured at the finishing part of the rotating grindstone constant. And / or controlling one or both of the rotation speed of the rotating wheel and the rotation speed of the rotating grindstone.
[0012]
When the disc surface of the disc portion is traversed, the finishing portion always grinds a portion under the same conditions, so that the disc surface of the disc portion can be finished within a desired tolerance. Therefore, it is possible to cope with a work having a different width by using a rotating grindstone having a small width.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals.
FIG. 1 is a front view of a work to be ground by the disk part grinding method according to the present invention.
The work 11 is a component of a continuously variable transmission (CVT) and has a shaft 12 and a disk portion 13 formed at the center of the shaft 12.
The shaft 12 has a first outer surface 15 and a second outer surface 16 formed at the center.
[0014]
The disk portion 13 has an inner portion 21 formed with a diameter Di continuously from the shaft 12, and an outer portion 22 formed with a diameter Do continuously from the inner portion 21. A sheave surface 23 is formed at a sheave surface angle θ, and a back surface 24 is formed on the other. Wf indicates the width of the sheave surface.
The sheave surface 23 is a portion for holding a metal belt.
[0015]
FIG. 2 is a plan view of a grinding machine used in the disk portion grinding method according to the present invention. The axis on the right side of the figure is a coordinate axis, and indicates the direction of movement by a straight line or rotation. X is an axis indicating horizontal linear motion, Y is an axis orthogonal to X (the direction of the front and back in the figure), Z is an axis orthogonal to X and Y, B is an axis indicating a turning motion around the Y axis, and C is Z. It is an axis that shows a swiveling motion about the axis.
[0016]
The grinder 31 is an NC (numerical control) grinder, and is arranged in parallel with a base 32, a headstock 33 disposed on the base 32, a tailstock 34 facing the headstock 33, and the tailstock 34. Z-axis base 35, a B-axis turning device 36 mounted on the Z-axis base 35, an X-axis feed device 41 mounted on the B-axis turning device 36, and mounted on the X-axis feed device 41 A Z-axis feeder 42, a grindstone table 43 mounted on the Z-axis feeder 42, a work sizing detector 44, a grinding jig 45, a headstock 33, a Z-axis base 35, and a B-axis turning device 36, a control panel 47 for controlling the X-axis feeder 41, the Z-axis feeder 42, the grindstone table 43, the work size detector 44, and the grinding jig 45 based on information of a preset NC program, and an operation panel 48 And
[0017]
The headstock 33 includes a spindle 51 that rotates the work 11 and an electric motor 52. The number of revolutions of the electric motor 52 is continuously increased or decreased based on a preset NC program or information on the operation panel 48 to perform grinding. It is possible to change the peripheral speed of the middle work 11.
[0018]
The grindstone table 43 includes a rotating shaft 53 and an electric motor 54, and continuously increases or decreases the number of revolutions of the electric motor 54 based on a preset NC program or information on an operation panel 48, and controls the grinding wheel 55 during grinding. The peripheral speed can be changed.
[0019]
The grindstone 55 has abrasive grains of CBN, a width of Ws (20 mm), and an outer diameter of Ds (350 mm). 56 indicates a width center, and 57 indicates a finished portion.
The width Ws of the grindstone 55 was set smaller than the width Wf of the sheave surface (disk surface) 23 of the disk portion 13.
The work size detecting device 44 has a sheave surface detecting device 58 for detecting the size of the sheave surface 23 and a shaft diameter detecting device 59 for detecting the size of the first outer surface 15 of the shaft 12.
[0020]
Next, a method of grinding a disk portion using the grinding machine 31 having such a configuration will be described.
First, the work 11 is set on the grinding machine 31, and then the NC program is input on the control panel 47 and the operation panel 48.
[0021]
The grinding conditions are as follows: the rotational speed of the spindle 51 is N (rpm), the rotational speed of the disk 13 is n (rpm), the peripheral speed of the disk 13 is V (m / min), and the relative grinding speed is Vr ( m / min), the rotational speed of the grindstone 55 is Ns (rpm), the peripheral speed of the grindstone 55 is v (m / min), the cutting depth (the direction of the arrow (1)) is t (mm), and the feed of the grindstone 55 is performed. (The direction of arrow (2)) was set to f (mm / sec). Naturally, the coordinates of other devices such as the turning angle θ of the B-axis turning device 36 and the Z-axis base 35 are also set.
The rotation speed of the disk unit 13 is the number of rotations (rpm) of the disk unit 13.
The rotation speed of the grindstone 55 is the number of revolutions (rpm) of the grindstone 55.
[0022]
Further, there are three grinding conditions, and any one of the first to third speed conditions is set.
The first speed condition is to make the peripheral speed v of the grindstone 55 constant and variably control the rotation speed n of the work 11.
As the second speed condition, the rotational speed n of the work 11 is kept constant, and the peripheral speed v of the grindstone 55 is variably controlled.
The third speed condition variably controls both the rotational speed n of the work 11 and the peripheral speed v of the grindstone 55.
A method of grinding the disk portion in which the first to third speed conditions are set will be described in detail with reference to the following drawings.
[0023]
FIG. 3 is an explanatory view of a method of grinding a disk portion according to the present invention.
Under the first speed condition, the relative grinding speed Vr is the peripheral speed V of the disk portion 13 (Vr = V), and ignores the peripheral speed v of the related grindstone 55.
First, the grindstone 55 is sent to the inner portion 21 located on the center side of the disk portion 13, and then the grindstone 55 is sent from the inner portion 21 to the outer portion 22 located radially outward by an arrow ▲. Move (traverse cut) as shown in 3 ▼. At this time, the rotational speed n of the work 11 is changed so that the peripheral speed (grinding speed) V of the disk portion 13 measured at the width center 56 of the grindstone 55 becomes constant.
[0024]
For example, when the peripheral speed v of the grindstone 55 is 7200 m / min, the rotation speed n of the work 11 is 1000 rpm, and the inner portion 21 is ground, the position of the width center 56 of the grindstone 55 is the diameter Ds ( 0.082 m), the peripheral speed (grinding speed) Vs of the disk portion 13 at the position S is 257 m / min. This 257 m / min is kept constant. Finally, when the position of the width center 56 of the grindstone 55 reaches the position E having the diameter De (0.156 m) of the outer portion 22, the peripheral speed (grinding speed) Ve at the position E is naturally 257 m / min. In order to do so, the rotation speed n of the work 11 is reduced to 526 rpm. That is, the rotation speed n of the work 11 is smoothly changed in the range of 526 to 1000 rpm.
[0025]
The above-mentioned fixed relationship between the deceleration of the rotation speed of the work 11 and the relative grinding speed is simply shown by a graph.
FIG. 4 is a graph showing the relationship between the grinding position of the disk portion and the relative grinding speed, the relationship between the grinding position and the peripheral speed of the rotating grindstone, and the number of revolutions of the work. The horizontal axis represents the grinding position of the disk portion. The vertical axis on the left in the figure is the relative grinding speed Vr and the peripheral speed v of the rotary grindstone, and the vertical axis on the right in the figure is the rotational speed n of the work.
As the grindstone moves from the position on the center side (diameter Di) of the disc portion to the position on the outside diameter Do, the rotational speed n of the work is gradually reduced, so that the relative grinding speed Vr of the disc portion, that is, The peripheral speed V is kept constant.
[0026]
As described above, in the disk portion grinding method (first speed condition), the rotation speed (the number of rotations n) of the disk portion 13 is set such that the peripheral speed (grinding speed) V of the disk portion 13 is constant. Since the control is performed, the sheave surface (disc surface) 23 can always be ground under the same conditions, and the width Ws of the grindstone 55 is set to be smaller than the width Wf of the sheave surface (disc surface) 23. Even if the grinding is performed, the sheave surface 23 of the disk portion 13 can be finished within a desired tolerance, and a small width grindstone can be used for a workpiece having a different width. Therefore, the width Ws of the grindstone 55 can be reduced, and the manufacturing cost of the grindstone can be reduced.
[0027]
FIG. 5 is a detailed view of part 5 of FIG. 3, and shows the surface roughness and undulation of the sheave surface 23 after grinding. The surface roughness meter used for the measurement is a ready-made one, and the detailed measurement conditions are not described, but one scale on the vertical axis is set to 1 μ. The grinding conditions were almost the same as those already described with reference to FIG. 3. The feed f of the grindstone was set to 1.6 mm / sec, and the cutting depth t was set to 0.1 mm.
[0028]
The surface roughness of the sheave surface 23 is ensured, and the undulation of the sheave surface (disk surface) 23 of the disk portion 13 is small. Therefore, in the disk portion grinding method of the present invention, it is possible to reduce the width of the grindstone and reduce the manufacturing cost of the grindstone.
[0029]
Next, the second speed condition will be described with reference to FIG.
Under the second speed condition, the relative grinding speed Vr is a relative speed between the peripheral speed v of the grinding wheel 55 and the peripheral speed V of the disk portion 13. Specifically, the peripheral speed v of the grindstone 55 is changed so that the relative grinding speed Vr between the peripheral speed V of the disk portion 13 measured at the width center 56 of the grindstone 55 and the peripheral speed v of the grindstone 55 is constant.
In the grinding, if the rotation direction of the grindstone 55 is, for example, clockwise rotation, the rotation direction of the disk portion 13 is also clockwise rotation. That is, the grindstone 55 and the disk portion 13 move in the same direction.
[0030]
For example, when the rotational speed n of the workpiece 11 is 1000 rpm and the inner portion 21 is ground, if the position of the width center 56 of the grindstone 55 is at the position S of the diameter Ds (0.082 m) of the disk portion 13, The relative grinding speed Vr at the position S is a difference between the peripheral speed Vs (257 m / min) of the disk portion 13 and the peripheral speed v (7200 m / min) of the grindstone 55, that is, Vr = 6943 m / min. This 6943 m / min is kept constant. Finally, when the position of the width center 56 of the grindstone 55 reaches the position E having the diameter De (0.156 m) of the outer portion 22, the relative grinding speed Vr at the position E must be 6943 m / min, and so on. To do so, the peripheral speed v of the grindstone 55 is reduced to 6453 m / min. 6453 m / min is a value obtained by subtracting the peripheral speed Ve (490 m / min) of the disk portion 13 increasing at the position E.
That is, the peripheral speed v of the grindstone 55 is smoothly changed in the range of 6453 to 7200 m / min.
[0031]
As described above, in the disk portion grinding method (the second speed condition), the sheave surface (disk surface) 23 can always be ground under the same condition, and the same effect as in the first speed condition is exhibited. be able to. That is, the manufacturing cost of the grindstone can be reduced.
[0032]
Finally, the case where the third speed condition is selected will be described.
As described above, the third speed condition changes both the rotational speed n of the work 11 and the peripheral speed v of the grindstone 55. Specifically, both are changed so that the relative grinding speed Vr between the peripheral speed V of the disk portion 13 measured at the width center 56 of the grindstone 55 and the peripheral speed v of the grindstone 55 becomes constant.
In the disk portion grinding method (third speed condition), the same effect as in the second speed condition can be exhibited. That is, the manufacturing cost of the grindstone can be reduced.
[0033]
Next, another embodiment of the disk portion grinding method according to the present invention will be described.
FIG. 6 is a diagram showing another embodiment, and shows a second embodiment. The same components as those in the embodiment shown in FIG. 3 are denoted by the same reference numerals, and description thereof is omitted.
[0034]
Another embodiment is characterized in that the relative grinding speed Vr is measured at the finishing portion 57 of the grindstone 55.
In the finishing portion 57 of the grindstone 55, the traverse cut (in the direction of the arrow [4]) is performed so that there is no cutting depth t cut into the sheave surface 23 of the disc portion 13 and almost no sparks come out. This is the part to be ground.
[0035]
First, the first speed condition will be described.
The grindstone 55 is moved (traverse cut) by the feed f from the inner portion 21 to the outer portion 22 of the disk portion 13 as indicated by the arrow (4), and the rotation speed n of the work 11 is changed. Specifically, the rotational speed n of the work 11 is changed so that the peripheral speed (grinding speed) V of the disk portion 13 at the relative grinding speed Vr measured by the finishing portion 57 of the grindstone 55 becomes constant.
[0036]
FIG. 7 is a detailed view of a portion 7 of FIG. 6, and shows the surface roughness and undulation of the sheave surface 23 after grinding. One scale on the vertical axis was set to 1 μ. The grinding conditions are the same as those described with reference to FIG.
The undulation of the sheave surface 23 can be further reduced.
[0037]
As described above, in the disk portion grinding method (first speed condition) according to another embodiment, undulation can be further reduced. Therefore, the width Ws of the grindstone 55 can be reduced, and the manufacturing cost of the grindstone can be reduced.
[0038]
Next, the second speed condition will be described.
The peripheral speed v of the grindstone 55 is controlled such that the relative grinding speed Vr between the peripheral speed V of the disk portion 13 measured by the finishing portion 57 of the grindstone 55 and the peripheral speed v of the grindstone 55 is constant.
[0039]
According to the disk portion grinding method (second speed condition) of another embodiment, the same effect as the first speed condition of another embodiment can be exerted. That is, the width Ws of the grindstone 55 can be reduced, and the manufacturing cost of the grindstone can be reduced.
[0040]
Finally, the third speed condition will be described.
Under the third speed condition, the rotation speed of the work 11 is controlled so that the relative grinding speed Vr between the peripheral speed V of the disk portion 13 and the peripheral speed v of the grindstone 55 measured by the finishing portion 57 of the grindstone 55 is constant. n and the peripheral speed v of the grindstone 55 are both controlled.
[0041]
In the disk portion grinding method (third speed condition) of another embodiment, the same effect as the first speed condition of another embodiment can be exerted. That is, the width Ws of the grindstone 55 can be reduced, and the manufacturing cost of the grindstone can be reduced.
[0042]
Although the grindstone 55 of FIGS. 3 and 6 shown in the embodiment of the present invention is moved outward (traverse cut) from the center of the disk portion 13, conversely, it is moved from the outside to the center. The same effect can be exerted.
Although the speed is measured at the position corresponding to the width center 56 of the grindstone 55 or the finishing portion 57, it is also possible to measure the speed at the remaining portion, for example, at the edge of the tip (reverse of the finishing portion 57).
[0043]
【The invention's effect】
The present invention has the following effects by the above configuration.
In claim 1, the width of the rotating grindstone is set to be smaller than the width of the disk surface, and the rotating grindstone is moved from the center of the disk portion to the outside or from the outside to the center, and at the center of the width of the rotating grindstone. Both or one of the rotation speed of the disk portion and the rotation speed of the rotating grindstone is controlled so that the measured relative grinding speed is constant.
In the grinding method that controls the rotation speed of the work, the rotation speed of the rotating work is continuously changed without changing the rotation speed of the rotating grindstone. It becomes constant outside. As a result, when traversing the disk surface of the disk part, the width center of the rotary grinding wheel always grinds the part under the same conditions, so even if the width of the rotary grinding wheel is set small, the disk of the disk part The surface can be finished to a desired tolerance. Therefore, it is possible to cope with a work having a different width by using a rotating grindstone having a small width, and it is possible to reduce the manufacturing cost of the grindstone.
[0044]
In the grinding method that controls the rotating speed of the rotating grindstone, the rotating speed of the rotating grindstone during rotation is continuously changed without changing the rotating speed of the work. Be constant. Therefore, it is possible to cope with a work having a different width by using a rotating grindstone having a small width, and it is possible to reduce the manufacturing cost of the grindstone.
[0045]
It controls both the rotation speed of the work and the rotation speed of the rotating grindstone. Since both rotation speeds are continuously changed, the relative grinding speed is constant outside the center of the disk portion and radially outward. Therefore, it is possible to cope with a work having a different width by using a rotating grindstone having a small width, and it is possible to reduce the manufacturing cost of the grindstone.
[0046]
In claim 2, the width of the rotating grindstone is set smaller than the width of the disk surface, and the rotating grindstone is moved from the center of the disk portion to the outside or from the outside to the center. Both or one of the rotation speed of the disk portion and the rotation speed of the rotating grindstone is controlled so that the measured relative grinding speed is constant.
When traversing the disk surface of the disk part, the finishing part always grinds the part under the same conditions, so even if the width of the rotating grindstone is set small, the disk surface of the disk part is within the desired tolerance. Can be finished. Therefore, it is possible to cope with a work having a different width by using a rotating grindstone having a small width, and it is possible to reduce the manufacturing cost of the grindstone.
[Brief description of the drawings]
FIG. 1 is a front view of a work to be ground by the disk part grinding method according to the present invention; FIG. 2 is a plan view of a grinding machine used in the disk part grinding method according to the present invention; FIG. FIG. 4 is a graph showing the relationship between the grinding position of the disk portion and the relative grinding speed, and the relationship between the grinding position, the peripheral speed of the rotating grindstone, and the number of revolutions of the workpiece. FIG. 5 is a detailed view of 5 parts of FIG. 6 FIG. 6 is a view of another embodiment FIG. 7 is a detailed view of 7 parts of FIG. 6 FIG.
Reference numeral 11: Work, 13: Disk portion, 23: Disk surface (sheave surface), 55: Rotating grindstone (grinding stone), 56: Width center of rotating grindstone, 57: Finishing portion of rotating grindstone, Ns: Rotation of rotating grindstone Speed, n: rotational speed of the disc portion, V: peripheral speed of the disc portion, v: peripheral speed of the grindstone, Vr: relative grinding speed, Ws: width of the grindstone, Wf: width of the disc surface (of the sheave surface) width).

Claims (2)

In a grinding method for processing a workpiece having a disk portion, while rotating the disk portion, grinding the disk surface of the disk portion with a rotary grindstone,
The width of the rotating grindstone is set to be smaller than the width of the disk surface, and the rotating grindstone is moved from the center of the disk part to the outside or from the outside to the center, and the relative measurement is performed at the center of the width of the rotating grindstone. A method for grinding a disk portion, characterized by controlling both or one of a rotation speed of a disk portion and a rotation speed of a rotary grindstone so that a grinding speed is constant. In a grinding method for processing a workpiece having a disk portion, while rotating the disk portion, grinding the disk surface of the disk portion with a rotary grindstone,
The width of the rotating grindstone is set to be smaller than the width of the disk surface, and the rotating grindstone is moved from the center of the disk portion to the outside or from the outside to the center, and the relative measurement at the finishing part of the rotating grindstone is performed. A method for grinding a disk portion, characterized by controlling both or one of a rotation speed of a disk portion and a rotation speed of a rotary grindstone so that a grinding speed is constant.

Images