JPH0592364A - Method of correcting grinding wheel - Google Patents

Abstract

PURPOSE:To provide a method of correcting a grinding wheel, which can enhance the degree of accuracy for the shape of a workpiece while improving the surface roughness, and which can prolong the service life of the grinding wheel. CONSTITUTION:A tapered part 2 in the front part and a straight part in the rear part of a grinding wheel 1 are roughly tooled, and then the straight part 3 are finely tooled. Since the tapered part 2 by which to traversely grind a workpiece is roughly tooled, the degree of accuracy for the shape of the workpiece can be ensured, and since the straight part 3 adapted to finish the workpiece is finely tooled, the surface roughness of the workpiece can be made to be satisfactory. Since the tapered part 2 are roughly tooled but the straight part 3 is finely tooled, the frequency of correction for the grinding wheel 1 can be reduced, and the use life thereof can be prolonged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a case where a workpiece is to be traversed by using a grindstone in which a front tapered portion and a rear straight portion are integrally formed by a CNC cylindrical grinder or the like. In the above, it relates to a method for correcting the grindstone.

[0002]

2. Description of the Related Art As shown in FIG. 3, when performing a traverse grinding process on a workpiece with a grindstone having the above-mentioned shape, the grindstone 1
The work piece 4 is ground by the tapered portion 2 to remove the work material, and the work piece 4 is finish-ground by the straight portion 3 of the grindstone 1 to form the machined surface texture of the work piece 4.

If the above-mentioned grinding process is continued, the surface of the grindstone will be worn away. Therefore, conventionally, in the case of a metal bond grindstone used for high-speed machining, truing and dressing are performed on both the taper part and the straight part of the grindstone. I am fixing the whetstone.

[0004]

However, in the above-mentioned conventional method for correcting a grindstone, if rough truing is performed in order to secure the shape accuracy of the work, the surface roughness of the work is deteriorated faster, and the grindstone is corrected. The frequency is high and the life is short. Also, for example, if you truing finely by slowing the truing speed or reducing the depth of cut,
Although the surface roughness of the workpiece is improved, there is a problem that the cutting resistance is large and the shape accuracy is deteriorated.

The present invention solves the above-mentioned problems,
It is an object of the present invention to provide a method for correcting a grindstone that can secure a good shape accuracy and surface roughness of a work piece and can extend the life of the grindstone.

[0006]

SUMMARY OF THE INVENTION A method of repairing a grindstone according to the present invention is such that the taper portion of a grindstone in which a front tapered portion and a rear straight portion are integrally formed is roughly trued to finely straighten the straight portion. It is true.

[0007]

In the method for correcting a grindstone of the present invention, when the workpiece is traverse-ground, the taper portion for removing the work material of the workpiece is roughly trued so that the sharpness of the abrasive grains is improved and the workpiece is sharpened. The shape accuracy of can be secured. And
Since the straight part for finishing the work is finely trued, the surface roughness of the work can be improved.

Further, since the taper portion is coarse and the straight portion is finely trued, the grindstone can be corrected less frequently and the life of the grindstone can be extended.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic plan view showing an example of a CNC cylindrical grinding machine for carrying out the method for correcting a grindstone according to the present invention. In FIG. 1, reference numeral 5 is a head, on the bed 5, a table 7 reciprocating in the horizontal direction of FIG. 1 by a table feed motor 6 and a grindstone reciprocating in the vertical direction of FIG. A stand 9 is provided.

A headstock 10 and a tailstock 11 are arranged on the table 7 so as to oppose each other on the left and right, and are supported by the headstock 10 and are rotated by a spindle drive motor (not shown).
The workpiece 4 is detachably supported by a chuck 13 provided at the tip of the spindle 12 between the and the tailstock. Further, on the table 7, a truing device 14 and a dressing device 15 facing the grindstone 9 are arranged side by side, and a truer 14a of the truing device 14 and a dresser 15a of the dressing device 15 are respectively motors (both not shown). It can be rotated by.

A grindstone 1 rotated by a grindstone rotation motor 16 is provided on the grindstone base 9. This whetstone 1
The taper portion 2 on the right side of FIG. 1 and the straight portion 3 on the left side are integrally formed.

In order to grind the workpiece 4 by the CNC cylindrical grinder constructed as described above, a spindle drive motor (not shown) provided on the headstock 10 from a position before the grinding shown in FIG. 12, the chuck 13 and the workpiece 4 are rotated around the axis, and the grindstone 1 is rotated by the grindstone rotating motor 16 while the grindstone feed motor 8 moves the grindstone base 9 downward in FIG. Is brought into contact with the outer peripheral surface of the workpiece 4. In this state, the table 7 is moved to the left in FIG. 1 by the table feed motor 6 so that the grindstone 1 traverses the workpiece 4 as described above with reference to FIG.

After the grinding of the workpiece 4 is completed, the grindstone feed motor 8 moves the grindstone base 9 upward, and then the table feed motor 6 moves the table 7 rightward to move the table 7 and the grindstone base. 9 is returned and stopped, and rotations of the spindle 2 and the grindstone 1 are also stopped.

Then, the workpiece 4 that has been ground is replaced, the unmachined workpiece is supported between the spindle 12 and the tailstock 11, and the above-described grinding is repeated. When a grinding process is performed on a predetermined number of workpieces, the surface of the grindstone 1 is worn such as a recess 17 as shown in FIG. 2A, and the whetstone 1 is shaken due to the wear. Will need to be fixed.

The whetstone 1 is corrected by rotating the tool 14a while rotating the tool 14a, moving the whetstone base 9 downward, and then moving the table 7 leftward.
The outer peripheral surface of 4a and the surface of the grindstone 1 are brought into contact with each other. That is, in the case of the grindstone 1 in which the abrasive grains 1a made of diamond or CBN are held by the metal bond 1b, the correction method according to the embodiment of the present invention is performed. First, FIG.
As shown in FIG. 2B, both the tapered portion 2 and the straight portion 3 are brought into pressure contact with the surfaces of the tapered portion 2 and the straight portion 3 of the worn grindstone 1 shown in FIG. Then, truing is performed under the conditions shown in the table below to shape the shape of the grindstone 1.

Next, the table 7 and the grindstone base 9 are returned to the left and above, the truer 14a is stopped, the dresser 15a is rotated, and the table 7 and the grindstone base 9 are moved in substantially the same manner as in the case of the truing. The surface of the taper portion 2 and the straight portion 3 of the grindstone 1 and the dresser 15a.
The outer peripheral surface of the metal bond 1b is pressed against the outer peripheral surface of the metal bond 1b, and both the taper portion 2 and the straight portion 3 are dressed so that the abrasive grains 1a protrude from the outer peripheral surface of the metal bond 1b to a predetermined height. Let

Further, the table 7 and the grindstone base 9 are returned to each other, and the taper portion 2 of the grindstone 1 is moved by the truer 14a as shown in the table below, in which the traverse speed and the depth of cut are the same as those of the previous truing conditions. Truing is performed under a small amount of truing conditions to roughen the abrasive grains 1a of the taper portion 2, and as shown in FIG.
To ensure good sharpness. Then, as shown in the table below, the straight portion 3 of the grindstone 1 is trued under the truing conditions in which the traverse speed, the cutting amount, and the truing amount are the same as or smaller than those in the previous truing condition, as shown in FIG. ), The abrasive grains 1a of the straight portion 3 are made fine, and the tips of these abrasive grains 1a are aligned with a fine cutting blade.

After the above steps have been carried out to complete the correction of the grindstone, each section is returned to the position before the grinding process shown in FIG.
The above-mentioned grinding process is performed using the modified grindstone.

[Table] Traverse speed Depth of cut Truing amount = ≧ = ≧ ＞ ≧

In the above embodiment, the peripheral speed of the truer is set to V
Where T is the peripheral speed of the grindstone, VT / V = 0.7 to 0.8 for the dressing of the taper portion 2 and VT / V = 0.1 to 0.5 for the dressing of the straight portion 3. It is desirable to do in.

In the above embodiment, the taper portion 2 and the straight portion 3 are dressed and then the taper portion 2 is trued. However, in the present invention, only the straight portion 3 may be trued after the dressing. In this case, the cutting amount of the truing of the taper portion 2 and the straight portion 3 which is performed first is large, and the cutting amount of the truing of only the straight portion 3 which is performed later is small.

Although the case of the metal bond grindstone has been described above, the present invention can also be applied to a grindstone in which abrasive grains made of diamond or CBN are held by vitrified bonds. In this case, dressing can be omitted by first truing the tapered portion and the straight portion of the grindstone, then roughly truing the tapered portion, and then finely truing the straight portion.

[0023]

As described above, according to the present invention, in the method for correcting a grindstone in which the tapered portion of the front portion and the straight portion of the rear portion are integrally formed and the workpiece is traversed, the tapered portion is formed. The following effects can be obtained by coarsely truing and finely truing the straight part.

That is, in the method for correcting a grindstone of the present invention,
When traverse grinding a workpiece, the taper part that removes the work material of the workpiece is rough truing, so
The sharpness of the abrasive grains becomes good, and the shape accuracy of the workpiece can be secured. Since the straight portion for finishing the work is finely trued, the surface roughness of the work can be improved. Further, since the taper portion is rough and the straight portion is finely trued, it is possible to reduce the frequency with which the grindstone is corrected and to extend the life of the grindstone.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing an example of a grinder that performs a method for correcting a grindstone according to the present invention.

FIG. 2 is a partial vertical cross-sectional explanatory view of a grindstone showing an embodiment of a method for correcting a grindstone according to the present invention in process order.

FIG. 3 is a partial vertical cross-sectional view of a whetstone to be corrected according to the present invention during a grinding process.

[Explanation of symbols]

 1 Grindstone 1a Abrasive grain 1b Metal bond 2 Tapered part 3 Straight part 4 Workpiece

Claims (1)

[Claims] 1. A method for correcting a grindstone in which a front taper portion and a rear straight portion are integrally formed and traverse grinding is performed on a workpiece. In the method of correcting the whetstone, the taper portion is roughly trued and the straight portion is trued finely. A method of repairing a whetstone characterized by: