JPH05162056A - Groove grinding device - Google Patents

Abstract

PURPOSE:To minify variation of grinding efficiency, lengthen the life of a grinding wheel, and grind a groove in a short time, by changing feed speed even length variation of contact between a work W and the grinding wheel due to movement of the grinding wheel. CONSTITUTION:This groove grinding device is provided with a control device 30 with which the speed of feed to move a grinding wheel base 10 or a table 20 in the direction of meeting at right angles with the rotary axis of a grinding wheel 11 is reduced as the length of contact arc between the grinding wheel 11 and the work W is increased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a groove grinding device for grinding a groove of a work.

[0002]

2. Description of the Related Art A conventional groove grinding device grinds a groove of a work by moving a grindstone in a direction orthogonal to a rotation axis of the grindstone, and a grindstone in a direction perpendicular to the rotation axis of the grindstone. Had a constant feed rate.

[0003]

When the feed speed of the grindstone is constant as described above, the grinding efficiency is low near the entrance and exit of the work because the length of contact of the grindstone with the work is short.
In the center of the work, the grinding stone has a long contact length with the work, so that the grinding efficiency is high. When the feed rate is increased to shorten the grinding time, there is a problem that the grinding efficiency becomes abnormally high and the life of the grindstone is shortened when the length of contact between the grindstone and the work becomes long. On the contrary, if the feed rate is set so that the grinding efficiency at a high time does not exceed the predetermined value, the grinding time becomes long.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and while rotating a circular grindstone, the circular grindstone is rotated in a direction perpendicular to the rotation axis of the grindstone. In a groove grinding device configured to grind a groove of a work by moving the work, the feed speed for moving the grindstone relative to the work in a direction orthogonal to the axis of rotation of the grindstone is defined as the length at which the grindstone contacts the work. Is provided with a control device that controls so as to decrease as the length increases.

[0005]

Function: The circular grindstone is rotated, and the grindstone is moved relative to the work in a direction orthogonal to the axis of rotation of the grindstone. The feed speed to be moved is gradually reduced as the length of the grindstone that contacts the work increases from the vicinity of the work entrance to the center, and the length of the grindstone that contacts the work decreases from the work center to the work exit. To make it larger, gradually increase.

[0006]

Embodiments of the present invention will be described with reference to the drawings.
In FIG. 1, reference numeral 10 denotes a grindstone base that moves in the vertical direction. A circular grindstone 11 is rotatably supported on the grindstone base 10 and is rotated by a motor (not shown) attached to the grindstone base 10. It has become. The grindstone base 10 is vertically moved by rotating a ball screw 13 by a servomotor 12. Reference numeral 20 denotes a table that moves in the left-right direction, and the work W is detachably fixed to the table 20. The table 20 is moved left and right by rotating a ball screw 22 with a servo motor 21. Reference numeral 30 denotes an NC device. The servo motor 12 is connected to the NC device 30 via a pulse generation circuit 31 and a drive circuit 32.
The servomotor 21 is connected to the C device 30 via a pulse generation circuit 33 and a drive circuit 34. Further, the input device 35 and the memory 36 are connected to the NC device 30, and the memory 3
6 stores a program for performing groove grinding according to the flow shown in FIG.

Next, the groove grinding will be described based on the above-mentioned structure. The grindstone 10 is rotated, and the grindstone base 10 is fast-forwarded and lowered to a predetermined height (steps 40 and 41). Next, the feed rate of the grindstone 10 is lowered by a predetermined amount while changing the feed rate (steps 42 to 46), and then the table 20 is moved leftward by a predetermined amount while changing the feed rate (steps 47 to 47).
51). Further subsequently, the grindstone base 10 is rapidly moved upward (step 52), the table 20 is rapidly moved leftward (step 53), and the rotation of the grindstone 11 is stopped (step 54). This completes the groove grinding of the work W.

In steps 42 to 46, as the groove is deeply cut into the work W, the grinding area and the grindstone 11 are increased.
As shown in FIG. 3, the contact arc length of contacting the workpiece W increases as the grindstone base 10 descends, and the feed speed of the grindstone base 10 is gradually reduced. Also, steps 47 to 51
In, when the table 20 is moved to the left while the groove is cut deep into the work W, the groove is cut,
The grinding area and the contact arc length are reduced, and the feed rate of the table 20 is increased stepwise. In FIG. 3, the grinding area, the contact arc length, the average grinding efficiency and the maximum grinding efficiency are shown in the left column of the drawing from the depth-left and right direction positions from the grinding wheel head 10.
Shows a value when the table is moved by 1 mm or the table 20 is moved by 2 mm. As can be seen here, the feed rate of the grinding wheel head 10 or the table 20 is set so that the average grinding efficiency and the maximum grinding efficiency do not change significantly by the movement of the grinding wheel head 10 or the table 20. The grinding efficiency changes every moment while the grindstone 10 is moved by 1 mm or the table 20 by 2 mm, and the maximum grinding efficiency during this period corresponds to the maximum grinding efficiency, and the average grinding efficiency during this period corresponds to the average grinding efficiency.

As described above, according to the present invention, the feed rate of the grindstone 10 or the table 20 is set so that the average grinding efficiency and the maximum grinding efficiency are not significantly changed by the movement of the grindstone 10 or the table 20. The grinding time can be shortened without shortening. In the above-described embodiment, the groove is ground while the grindstone 10 is moved down, and the groove is ground while the table 20 is moved to the left. However, the grindstone 10 is moved down without grinding the groove, The groove may be ground by moving the table 20 leftward.

Further, the above-mentioned embodiment has been described with respect to an example in which a groove is ground on a work having no groove, but the groove is formed in advance, and the invention can be applied to an example in which the side surface of the groove is ground.

[0011]

As described above, according to the present invention, the groove of the work is ground by rotating the circular grindstone and moving it relative to the work in a direction perpendicular to the axis of rotation of the grindstone. In the groove grinding device, a control device for controlling the feed speed for moving the grindstone relative to the work in a direction orthogonal to the rotation axis of the grindstone so as to decrease as the length of contact of the grindstone with the work becomes longer. Even if the length of contact of the grindstone with the workpiece changes, the change in the grinding efficiency can be reduced, the life of the grindstone can be extended, and the grinding time can be shortened.

[Brief description of drawings]

FIG. 1 is an overall schematic view of a groove grinding device according to the present invention.

FIG. 2 is a flow chart of groove grinding as an example of the present invention.

FIG. 3 is a diagram showing the relationship between the position of the grindstone with respect to the groove and the feed speed.

[Explanation of symbols]

 10 Whetstone stand 11 Whetstone 20 Table 30 NC device W work

Claims (1)

[Claims] 1. A groove grinding apparatus configured to grind a groove of a work by moving a circular grindstone in a direction orthogonal to a rotation axis of the grindstone with respect to the work while rotating the grindstone. A groove characterized by being provided with a control device for controlling the feed speed for moving in the direction orthogonal to the axis of rotation of the grindstone relative to the grindstone so as to decrease as the length of contact of the grindstone with the work becomes longer. Grinding equipment.