JPH09323260A - Truing-dressing method of grinding wheel and device thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the grinding time of a work as well as to maintain the accuracy of finishing is this work. SOLUTION: With the peripheral speed of a dressing roll 2 varied as making that of a grinding wheel 1 keep up to the peripheral speed in time of work grinding, a relative speed between the grinding wheel 1 and the dressing roll 2 is increased and wheel truing takes place. After this truing is over, the peripheral speed of the dressing roll 2 is varied as making that of the grinding wheel 1 keep up to the peripherals speed in time of work grinding, whereby the relative speed between the grinding wheel 1 and the dressing roll 2 is reduced to some extent, while it is set to less than the infeed rate in time or truing and thus dressing is carried out. The peripheral speed of the grinding wheel 1 is kept up to the same peripheral speed in time of the grinding work through the range from prior to truing starting to dressing ending.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a truing / dressing method and a grinding device for a grindstone (for example, a superabrasive grindstone or a CBN grindstone).

[0002]

2. Description of the Related Art FIG. 4 is an explanatory view showing a part of a conventional grinding apparatus.

A work W, a rotary truer 111 and a dressing roll 102 are arranged around the grinding wheel 101.

The grinding wheel 101 is rotatably supported on a grinding wheel base 104. The grinding wheel 101 is rotationally driven by a grinding wheel driving motor 113 installed on the grinding wheel base 104.

The work W is supported between a headstock and a tailstock (not shown), and is rotationally driven by a spindle drive motor (not shown).

The rotary truer 111 shapes the surface of the grindstone layer of the grinding wheel 101. Rotary Tsurua 1
11 is a notch ram 122 installed on the wheel head 104 so as to be movable in the radial direction and the axial direction of the grinding wheel 101,
It is rotatably supported. The cutting ram 122 is formed by a cutting device 123 having a motor as a driving source.
The unit is cut toward the grinding wheel 101 by a unit amount and is moved in the axial direction of the grinding wheel 101 by a traverse device (not shown). The rotary truer 111 is rotationally driven by a truer drive motor 128.

The dressing roll 102 is for making a cutting edge in the abrasive grains of the grindstone layer. Dressing roll 10
Reference numeral 2 is rotatably supported by a cutting table 126 that is supported so as to be movable in the radial direction of the grinding wheel 101. The dressing roll 102 is cut toward the grinding wheel 101 by a cutting device 127 having a motor as a drive source. The dressing roll 102 is rotationally driven by a dressing roll drive motor 129.

Next, a truing / dressing method for a grindstone which is carried out by the above-mentioned grinding apparatus will be described.

First, the truer drive motor 128 is operated to rotate the rotary truer 111 at a predetermined peripheral speed, and truing (shaping) is performed with a predetermined cut amount.

After completion of the truing, the dressing roll drive motor 129 is operated to operate the dressing roll 10.
2 is rotated at a predetermined peripheral speed and dressing is performed with a predetermined cut amount.

[0011]

By the way, in the above-described grinding apparatus, when dressing is performed after the truing is completed, the peripheral speed of the grinding wheel 101 is reduced as compared with the grinding process of the work W, and the dressing is performed. When finished, the peripheral speed of the grinding wheel 101 is increased again to return to the original peripheral speed. This is because the crushing of the abrasive grains is activated and the grinding resistance immediately after truing is rapidly reduced.

However, if the peripheral speed of the grinding wheel 101 is changed,
It takes a time (several seconds) to return to the original peripheral speed, which causes a problem that the grinding time of the work W becomes long.

Further, when the work W is processed with high precision, the rotation of the grinding wheel 101 must be stabilized. For this reason, in the actual grinding process, the grinding wheel 101 is rotated several hours before the grinding process is started, and the grinding wheel 101 is rotated. The method of stabilizing the rotation of the vehicle 101 before starting the work is adopted.

Therefore, during dressing, the grinding wheel 10
When the peripheral speed of 1 is changed and the peripheral speed is returned to the original peripheral speed after the dressing is completed, the rotation of the grinding wheel 101 is not immediately stable. Therefore, if the grinding process is started immediately after the dressing is completed, the machining accuracy of the work W is maintained. There was a problem that I could not.

The present invention has been made in view of the above circumstances, and its object is a truing / dressing method for a grindstone capable of shortening the grinding time of a workpiece and maintaining the machining accuracy of the workpiece. And to provide a device.

[0016]

In order to solve the above problems, a truing / dressing method for a grinding stone according to a first aspect of the present invention uses a rotary tool for truing / dressing to truing and dressing a rotating grinding stone. In the truing / dressing method of a grindstone, by changing the peripheral speed of the truing / dressing / combined rotary tool while maintaining the peripheral speed of the grindstone at the peripheral speed during work grinding, the grindstone and the truing / dressing / combined rotary tool Of the grinding wheel and the truing ・ by changing the peripheral speed of the truing / dressing rotary tool while maintaining the peripheral speed of the grindstone at the peripheral speed during work grinding. Decreasing the relative speed with the dressing / rotating tool , And performs dressing infeed amount of the following at the truing.

As described above, the relative speed between the grinding wheel and the truing / dressing / combining rotary tool is increased by changing the peripheral speed of the truing / dressing / combining rotary tool while maintaining the peripheral speed of the grindstone at the peripheral speed during grinding of the workpiece. Then, after truing is completed, by changing the peripheral speed of the truing / dressing combined rotary tool while maintaining the peripheral speed of the grindstone at the peripheral speed during work grinding, the relative relationship between the grindstone and the truing / dressing combined rotary tool. In addition to lowering the speed, dressing is performed with a cutting depth that is less than or equal to the time of truing, so the peripheral speed of the grindstone is maintained at the same peripheral speed as during grinding from before truing to the end of dressing. You can start.

Further, even if the grinding process of the work is started immediately after the dressing is finished, the working accuracy of the work can be maintained.

A truing / dressing method for a grindstone according to a second aspect of the present invention is the truing / dressing method for a grindstone according to the first aspect, wherein the grindstone is a grindstone for internal grinding. It is characterized by comprising a main body and a quill that supports the main body of the grindstone.

Since the contact resistance between the grindstone and the truing / dressing rotary tool at the time of truing and dressing is small, truing and dressing can be performed without bending the quill, and the surface of the grindstone is shaped into an accurate shape. In addition, it is possible to surely form a sharp cutting edge.

According to a third aspect of the present invention, there is provided a truing / dressing device for a whetstone, which is a truing / dressing rotary tool for truing and dressing a whetstone, a rotary driving means for rotationally driving the whetstone, and a truing / dressing rotary tool. In a truing / dressing device for a grindstone, which comprises a driving means for driving the whetstone and a control means for controlling the driving means, the control means keeps the peripheral speed of the grindstone at the peripheral speed at the time of workpiece grinding during truing. By changing the peripheral speed of the truing / dressing / combined rotary tool, the relative speed between the grindstone and the truing / dressing / combined rotary tool is increased, and during dressing, the peripheral speed of the grindstone is set to the peripheral speed during work grinding. While maintaining the above-mentioned truing and dressing rotary tool By varying the speed, as well as lower the relative speed between the grinding wheel and the truing-dressing combined rotary tool, characterized in that the depth of cut of less during the truing.

The peripheral speed of the grindstone is kept at the same peripheral speed as during grinding from the start of truing to the end of dressing, and the work grinding can be started immediately after the dressing is completed.

Further, even if the grinding work of the work is started immediately after the dressing is finished, the working accuracy of the work can be maintained.

[0024]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a view showing a truing and dressing device for carrying out a truing and dressing method for a grindstone according to a first embodiment of the present invention.

This truing / dressing device is
A dressing roll (a truing / dressing rotating tool) 2 for truing and dressing a grinding wheel (grinding wheel) 1, a dresser driving device (driving means) for driving the dressing roll 2, and a relative speed between the grinding wheel 1 and the dressing roll 2. And a control unit (control means) 3 for controlling the. The truing / dressing device constitutes a part of a grinder (not shown).

A work W and a dressing roll 2 are arranged around the grinding wheel 1.

The work W is supported between a head stock (not shown) and a tailstock (not shown) of the grinder, and is rotationally driven by a spindle drive motor (not shown).

The dressing roll 2 is rotatably supported by a dresser body 5 installed on a grindstone base 4 of a grinder so as to be movable in a radial direction and an axial direction of the grinding wheel 1. A drive motor (not shown) is attached to the dresser body 5, and the dressing roll 2 is rotationally driven by the drive motor. The dresser body 5 is cut by a predetermined amount toward the grinding wheel 1 by a drive motor (not shown) and is moved in the axial direction of the grinding wheel 1.

In the dressing roll 2 of this embodiment, the cutting edge 1 is added to the abrasive grains 10 (see FIG. 2C) of the grinding wheel 1.
In addition to the original function of the dressing roll for making 0a, it also has the function of a rotary truer for shaping the surface of the grindstone layer of the grinding wheel 1.

The dresser drive device is composed of the drive motors and a drive circuit 6 for driving the drive motors.

The control unit 3 is composed of a CPU, various memories and the like.

FIG. 2 is a sectional view showing the surface shape of the grinding wheel layer of the grinding wheel, FIG. 2 (a) is a sectional view showing the surface shape of the grinding wheel layer before truing, and FIG. 2 (b) is a grinding wheel after truing and before dressing. FIG. 2C is a sectional view showing the surface shape of the layer, and FIG. 2C is a sectional view showing the surface shape of the grindstone layer after dressing.
The truing / dressing method for the grindstone according to the first embodiment will be described with reference to FIG.

First, truing is performed. When the surface of the grindstone layer of the grinding wheel 1 is made uneven by the grinding of the work W as shown in FIG. 2A, the surface of the grindstone layer of the grinding wheel 1 is shaped. In this truing, the rotation speed of the drive motor for the dressing roll 2 is controlled so that the relative speed between the dressing roll 2 and the grinding wheel 1 becomes high. In this embodiment, the peripheral speed of the grinding wheel 1 is kept at the peripheral speed during grinding, and the peripheral speed of the dressing roll 2 is changed,
Increase the relative speed. This reduces the contact resistance. The relative speed and depth of cut at this time depend on the shape of the grinding wheel 1,
Determined by rigidity, type, etc.

When truing is performed by increasing the relative speed between the grinding wheel 1 and the dressing roll 2 in this way, the surface of the grinding wheel layer of the grinding wheel becomes flat as shown in FIG. 2 (b).

When the relative speed between the dressing roll 2 and the grinding wheel 1 is high, the formability is improved, but the abrasive grains are largely crushed, so that dressing is required.

After the truing is completed, the cutting amount is set to the following or less when truing, and the dressing roll 2 and the grinding wheel 1 are used.
The rotation speed of the drive motor of the dressing roll 2 is controlled so that the relative speed to In this embodiment, the peripheral speed of the grinding wheel 1 is maintained at the peripheral speed during grinding, and the peripheral speed of the dressing roll 2 is changed to reduce the relative speed. This reduces the contact resistance. The relative speed and the depth of cut at this time are determined by the shape, rigidity, type, etc. of the grinding wheel 1.

In this way, the relative speed between the grinding wheel 1 and the dressing roll 2 is reduced and the depth of cut is very small (0.5 to
When the dressing is performed with a thickness of 1.0 μm), FIG.
As shown in, the tip of the abrasive grain 10 is crushed and a large number of fine cutting edges 10a are formed.

Truing of the grindstone according to this embodiment
According to the dressing method, the peripheral speed of the grinding wheel 1 is kept at the peripheral speed during the grinding process, and the peripheral speed of the dressing roll 2 is changed, so that the relative speed between the grinding wheel 1 and the dressing roll 2 is increased and truing is performed. While doing, grinding wheel 1
Dressing is performed by lowering the relative speed between the dressing roll 2 and the dressing roll 2.
The grinding process can be started and the working time can be shortened.

Since truing and dressing are performed without changing the peripheral speed of the grinding wheel 1 during dressing,
The rotation of the grinding wheel 1 is kept in the same stable state as during the grinding process, and even if the grinding process of the work W is started immediately after the dressing is finished, the machining accuracy of the work is not deteriorated.

FIG. 3 is a view showing a truing and dressing device for carrying out a truing and dressing method for a grindstone according to a second embodiment of the present invention. Portions common to the above-described embodiments are denoted by the same reference numerals, and description thereof is omitted.

In the first embodiment described above, the case of using the grinding stone for external polishing as the grinding stone was described, but in the second embodiment, as shown in FIG. 3, the case of using the grinding stone for internal polishing is described. Describe.

The grindstone 21 is a grindstone for internal polishing. The whetstone 21 is composed of a cylindrical portion and a conical portion integrally provided at the end of the cylindrical portion. The grindstone 21 is connected to a drive motor (not shown) via a thin rod-shaped quill 30.

The truing / dressing method of the grindstone of this embodiment is as follows.

First, at the time of truing, the peripheral speed of the grinding wheel 1 is maintained at the peripheral speed during grinding and the peripheral speed of the dressing roll 2 is changed to increase the relative speed between the grinding wheel 21 and the dressing roll 2. This reduces the contact resistance.

After the truing is finished, the cutting amount is set to be equal to or less than that at the time of truing, the peripheral speed of the grindstone 21 is kept at the peripheral speed at the time of the grinding process, and the peripheral speed of the dressing roll 2 is changed, whereby the relative grindstone 21 and the dressing roll 2 Reduce speed. This reduces the contact resistance.

According to the second embodiment, the same effect as that of the first embodiment can be obtained, and since the contact resistance at the time of truing and dressing is small, the truing and dressing can be performed without bending the quill 30. The surface of the grindstone 21 for internal polishing can be shaped into an accurate shape, and a sharp cutting edge can be reliably formed.

As another embodiment of each of the above-mentioned embodiments,
The processing program may be stored in the memory of the control unit 3, and the rotation speed of each drive motor may be controlled by the CPU.

In the memory, the relative speed between the grinding wheel 1 and the dressing roll 2 is changed by keeping the peripheral speed of the grinding wheel 1 at the grinding speed and changing the peripheral speed of the dressing roll 2 during truing. By increasing the cutting amount to a value equal to or less than the truing time during dressing, keeping the peripheral speed of the grinding wheel 1 at the peripheral speed during grinding, and changing the peripheral speed of the dressing roll 2, the grinding wheel 1 and the dressing roll 2 are separated. A machining program for controlling the dresser driving device so as to reduce the relative speed is stored.

[0050]

As described above, according to the truing / dressing method for a grinding stone of the invention described in claim 1,
From the start of truing to the end of dressing, the peripheral speed of the grindstone is kept at the same peripheral speed as during grinding, and the grinding of the workpiece can be started immediately after the dressing is completed, so that the working time can be shortened. Even if the grinding process of the work is started immediately after the dressing is finished, the working accuracy of the work can be maintained.

According to the truing / dressing method for a grindstone of the second aspect of the present invention, since the contact resistance between the grindstone and the truing / dressing / rotating tool during truing and dressing is small, the truing is performed without bending the quill. Also, dressing can be performed, the surface of the grindstone can be shaped into an accurate shape, and a sharp cutting edge can be reliably formed.

According to the truing / dressing apparatus for a grindstone of the invention described in claim 3, the peripheral speed of the grindstone is maintained at the same peripheral speed as during grinding from the start of truing to the end of dressing, and the work is immediately The grinding process can be started.

Further, even if the grinding process of the work is started immediately after the dressing is finished, the working accuracy of the work can be maintained.

[Brief description of drawings]

FIG. 1 is a view showing a truing and dressing device for carrying out a truing and dressing method for a grindstone according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a surface shape of a grindstone layer of a grinding wheel.

FIG. 3 is a view showing a truing and dressing device for carrying out a truing and dressing method for a grindstone according to a second embodiment of the present invention.

FIG. 4 is an explanatory view showing a part of a conventional grinding device.

[Explanation of symbols]

 1 Grinding wheel 2 Dressing roll 3 Control unit W work

Claims (3)

[Claims] 1. A truing and dressing method for a whetstone which truing and dressing a rotating whetstone by using a truing / dressing rotating tool, wherein the truing By changing the peripheral speed of the dressing / rotating tool, the relative speed between the grindstone and the truing / dressing / rotating tool is increased to perform truing, and then the peripheral speed of the grindstone is set to the peripheral speed during work grinding. By changing the peripheral speed of the truing / dressing / combined rotary tool while keeping it, the relative speed between the grindstone and the truing / dressing / combined rotary tool is lowered, and dressing is performed with the following cutting amount during the truing. Characteristic grinding stone truing dress Packaging method. 2. The truing of the grindstone according to claim 1, wherein the grindstone is a grindstone for internal grinding, and the grindstone for internal grinding includes a grindstone main body and a quill that supports the grindstone main body. -Dressing method. 3. A truing / dressing / rotating tool for truing and dressing a grindstone, a rotation driving means for rotatively driving the grindstone, a driving means for driving the truing / dressing / rotating tool, and controlling the driving means. In a truing / dressing device for a grindstone including a control means, the control means changes the peripheral speed of the truing / dressing / rotating tool while maintaining the peripheral speed of the grindstone at the peripheral speed during work grinding during truing. By increasing the relative speed between the whetstone and the truing / dressing / rotating tool, during dressing, the truing while maintaining the peripheral speed of the whetstone at the peripheral speed during work grinding.
A truing / dressing device characterized by changing the peripheral speed of the dressing / rotating tool to reduce the relative speed between the grindstone and the truing / dressing / rotating tool, and to set the cutting depth at or below the time of the truing. .