JPH068140A - Circular arc shaping method for grinding wheel - Google Patents

Abstract

PURPOSE:To enable a grinding wheel having super abrasive grains to be shaped with high precision, regarding a grinding wheel circular arc shaping method capable of shaping the action plane of a grinding wheel to a circular arc shape with high precision. CONSTITUTION:In a grinding wheel 1 having abrasive grains of diamond or boron nitride, a mechanism is provided for vibrating and shaping the action plane of the wheel 1 required for machining cylindrical and spherical surface, by use of a disc type dresser having a minimum of two diamonds 2a, thereby providing a high precision shaping method.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming an arc shape of a grindstone capable of forming the working surface of a grinding grindstone using diamond or boron nitride as abrasive grains in a highly accurate arc shape.

[0002]

2. Description of the Related Art In order to achieve high accuracy and high efficiency in a grindstone applied to grinding of a cylinder or a spherical surface,
As shown in FIG. 3, it is necessary to form the working surface of the grindstone 1 into a cross section having a predetermined curvature 12. Generally, in forming a grindstone 8 using aluminum oxide or silicon carbide as abrasive grains, as shown in FIG. 4, a fixed dresser 9 made of one or a plurality of diamonds is mounted on a rotating arm 10 and a rotation center axis of the arm 10 is rotated. 11 is fixed at a position deviated from the radius of arc by 11 and the arm 10 is swung by the drive device 12 to form an arc shape on the working surface of the grindstone 8, and the grindstone base is defined when the shape changes due to wear or the like. A method is known in which the shape is formed again after being moved by a certain amount. Further, as shown in FIG. 5, a transverse feed device 13 and a cutting device 14 are provided, and a fixed dresser 15 is attached to the upper part thereof, and a fixed dresser is formed into an arc shape required by using a numerical control type drive device. How to do has been announced.

[0003]

Along with the prolongation of service life and hardness of products, materials that are difficult to process with conventional general grindstones or require a considerable processing time are used. In order to solve these problems, a grindstone using diamond or boron nitride as abrasive grains (hereinafter referred to as a superabrasive grain grindstone) is used.

However, when the grindstone is formed by the above-mentioned method, there is a problem in that the load applied to the fixed dresser at the time of forming is increased, and it is difficult to form the superabrasive grindstone with high precision.

The present invention solves the above-mentioned problems and provides a method for forming an arc shape of a grindstone capable of forming a superabrasive grain grindstone with high accuracy.

[0006]

In order to achieve the above object, the grindstone forming apparatus of the present invention has at least two or more diamonds necessary for forming the grindstone in a circular shape in place of the conventional fixed dresser. Using a disk-shaped dresser (hereinafter referred to as a disk-shaped dresser) arranged in a circle, the disk-shaped dresser is rotated, and the disk-shaped dresser is formed into an arc shape with a point separated from the tip of the diamond by the radius of the arc to be formed as a fulcrum. It is equipped with a mechanism for oscillating.

[0007]

According to the present invention, the disk-shaped dresser is rotated in the opposite direction with respect to the grindstone to be formed, thereby reducing the relative speed of the diamond on the disk-shaped dresser and the abrasive grains on the grindstone. Since the cutting depth of the abrasive grains is increased, a large grinding resistance is added, and the binding force of the grindstone is exceeded, the abrasive grains can be removed.

Further, since the diamond on the disk type dresser is hard to be embedded in the binder of the grindstone, the bonding force of the diamond is lowered.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for forming an arc shape of a grindstone according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a grindstone forming apparatus according to an embodiment of the present invention. The slide 4 is provided with a disk dresser 2 for forming the superabrasive grindstone 1 and a dresser driving device 3 for rotating the disk dresser 2.

The slide 4 is for adjusting the deviation amount between the rotation center shaft 6 of the arm 5 and the tip of the diamond 2a of the disk type dresser 2 to determine the arc radius to be formed.

The arm 5 is a slide 4 fixed to the upper part.
Is for swinging around the rotation center axis 6.

Reference numeral 7 denotes a cutting device, which is a mechanism for adjusting the entire unit according to wear of the superabrasive grindstone 1 in order to eliminate the gap between the superabrasive grindstone 1 and the disk dresser 2.

The operation of the grindstone forming apparatus configured as described above will be described with reference to the drawings.

First, the cutting device 7 is advanced until there is no space between the disc dresser and the superabrasive grindstone 1. After that, the disk type dresser 2 is rotated by the dresser driving device 3 and the arm 5 is swung to form the arc shape of the grindstone.

The operating state of the force at this time will be described with reference to FIG. The peripheral speed of the superabrasive grindstone 1 is V ₁ m / min, the peripheral speed of the disk dresser 2 is V ₂ m / min, and the energy E ₁ when the mass mKg of abrasive particles acts on the tip of the disk dresser Is represented as follows.

[0017]

[Equation 1]

The energy E ₂ of the conventional fixed dresser is as follows because the peripheral speed V _{2 of the} dresser is 0 m / min.

[0019]

[Equation 2]

From this,

[0021]

[Equation 3]

Therefore, when the disk dresser 2 is rotated, the energy received from the superabrasive grindstone 1 can be reduced.

On the other hand, the cutting depth g of the abrasive grains of the superabrasive stone 1
Is expressed as follows, where the cutting edge spacing is a mm, the grindstone outer diameter is D mm, the disk type dresser outer diameter is d mm, and the cutting depth is t mm.

[0024]

[Equation 4]

By rotating the disk type dresser at a high speed and sufficiently increasing the peripheral speed V ₂ in comparison with the general grinding state, the cutting depth g of the abrasive grains becomes large, and a large grinding resistance acts on the abrasive grains. Then, the abrasive grains fall off when the binding force of the binder is exceeded. Thus, a certain amount of incision is made and the arm 4 is swung at a swing speed V ₃ m / min to form an arc shape.

As described above, according to this embodiment, the disk-shaped dresser is rotated in the opposite direction to the grindstone, and the mechanism for swinging the entire dresser is provided to form the arc shape of the superabrasive grindstone. it can.

In the present embodiment, the grindstone shaft and the rotary shaft of the disk dresser are parallel, but the axial direction may be any direction.

[0028]

As described above, according to the present invention, by providing the mechanism for rocking the rotating body having at least two or more diamonds, it is possible to form a highly accurate arc shape on the superabrasive grindstone.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a method for forming an arc shape of a grindstone in an embodiment of the present invention.

FIG. 2 is an operation explanatory diagram in the embodiment.

FIG. 3 is a sectional view showing an arc shape of a grindstone.

FIG. 4 is a configuration diagram showing a conventional arc shape forming device.

FIG. 5 is a configuration diagram showing a conventional arc shape forming device.

[Explanation of symbols]

1 Super Abrasive Grain Stone 2 Fixed Dresser 3 Swing Center Axis 4 Arm 5 Swing Drive Device 6 Traverse Feed Device (Table) 7 Cutting Device (Table) 8 Disk Dresser 9 Dresser Drive Device 10 Arc Radius Adjustment Slide R Grindstone Arc radius V ₁ Whetstone peripheral speed V ₂ Disk type dresser peripheral speed V ₃ Disk type dresser swing speed

Claims (1)

[Claims] 1. In a grinding wheel using diamond or boron nitride as abrasive grains, the working surface of the wheel required for processing a cylinder and a spherical surface is rock-formed by a rotating body having at least two diamonds. A method for forming an arc shape of a grindstone, which is characterized by comprising a mechanism for