JPS61117053A - Surface grinding and surface grinder - Google Patents

Abstract

PURPOSE:To obtain a ground surface free of streaks with high quality by providing the transverse feed only at the edge of one-sided stroke in the reciprocating movement of a table and always carrying-out only the upward grinding or downward grinding. CONSTITUTION:When a dog 8 hits a limit switch 9 during grinding work, a transverse feeding instruction is supplied from a transverse feed motor controller 11 by the amount set in a transverse feed amount setting apparatus 13 by the signal supplied from a signal processor 10. Then, a transverse feed motor 12 is revolved by the instruction, and a saddle 5 is provided with a prescribed transverse feed. Therefore, since the transverse feed is provided only at the grinding work is always carried-out only through the upward or downward grinding. Therefore, a mirror surface which is uniform and free from the generation of streaks can be obtained with high quality.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a horizontal shaft square table type surface grinder 1. [Background of the Invention] In high precision grinding such as mirror grinding, one surface roughening, In addition to quantitative accuracy such as shape accuracy, the surface quality of the ground surface when visually observed is required, that is, the surface is uniform and beautiful.

Surface grinding machines that have various measures to improve precision in terms of mechanical elements are used for mirror surface grinding of flat surfaces, but the basic form of relative movement between the grinding wheel and the workpiece is similar to that used in general surface grinding. It is exactly the same as the disc. That is, as shown in a schematic diagram of the movement in FIG. 3, the table 2 performs a reciprocating movement within a range of a distance a.

The workpiece 3 is ground by applying a lateral feed of a distance between the grinding wheel 1 and the workpiece 3 placed on the table 2 at both ends of the stroke. .

However, in a horizontal axis square table type surface grinder, when the table 2 moves to the right and when it moves to the left.

Upward grinding and downward grinding are repeated alternately. In normal grinding, this is not a particular problem, but in high-precision grinding such as mirror grinding, due to the difference in the grinding mechanism between upward grinding and downward grinding, the state of light reflection from the grinding surface may be slightly different. There was a problem that a difference occurred, and streaks with a pitch corresponding to the lateral feed amount b# were observed, which deteriorated the surface quality.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a surface grinding method and a surface grinder that can obtain a ground surface with excellent surface quality by eliminating the problems of the prior art described above.

[Summary of the invention]

A feature of the present invention is that by applying lateral feed only at one stroke end of the table reciprocating motion, the workpiece is always ground only by upward grinding or only downward grinding.

[Embodiments of the invention]

Hereinafter, an embodiment of the present invention will be explained with reference to FIG. 1 and FIG. f82.

FIG. 1 is a schematic diagram showing the grinding method of the present invention.

In the same figure, the locus of the relative motion between the grindstone 1 and this thousand-pull 2 for one reciprocation of the table 2 is shown by two lines.
This is divided for convenience of explanation, and in reality, they reciprocate on the same trajectory.

In the case of the present embodiment, the table 2 makes one reciprocation within a range of distance a, and only when it reaches the right end of the stroke, lateral feed is applied by the distance. Therefore, when viewed from the direction of the arrow in the figure, if the grinding wheel 1 rotates clockwise, only the surface ground by upward grinding will remain; if it rotates counterclockwise, only the surface ground by downward grinding will remain, and the ground surfaces of upward grinding and downward grinding will remain. This ensures that the ground surface is always uniform. In the figure, table 2
Although the horizontal feed was applied only at the right end of the stroke, it is also possible to apply the horizontal feed only at the left end.

FIG. 2 shows the configuration and control block diagram of a surface grinder according to the present invention. 4 is a bed, and 5 is a saddle which slides along a guide surface on the bed 4 in the front and back direction on the right side in FIG. 1, giving transverse feed to the workpiece 3. Reference numeral 2 denotes a table that slides along a guide surface on a saddle 5 in the left-right direction in the figure to apply a grinding motion to the workpiece 3.

6 is fixed on the bed 4 by a column. A spindle head 7 moves up and down 11 along the guide surface of the column 6, giving cutting motion to the grindstone 1. The grindstone 1 is held by a grindstone shaft (not shown) which is rotatably held by a spindle head 7t. 8 is fixed to the table 2 with a dog, and 9a and 9b are detection switches (limit switches or proximity switches) for detecting the end of the table stroke.

The limit switch will be explained below) and is fixed to the saddle 5.

1 piece 1041J::Signal processing device for switch 9a, 1
1 is a control device for the traverse feed motor 2, and 13 is a traverse feed amount setting device.

In the above configuration, when the dog 8 hits the limit switch 9a during grinding, a signal from the signal processing device [10 causes the lateral feed motor controller 11 to send the lateral feed amount set in the lateral feed amount setting device 13. The feeding finger ◆ is poisonous. The lateral feed motor 2 is rotated by this finger ◆Jζ, and a predetermined lateral feed is applied to the saddle 5.

According to the above embodiment, since lateral feed is applied only at one stroke end of one side stroke of the left and right stroke of the table, the grinding process is always performed only by either upward grinding or downward grinding, which is due to the difference in the grinding mechanism. The effect is that a uniform and beautiful mirror surface can be obtained without the occurrence of streaks.

〔Effect of the invention〕

As described above, one advantage of the present invention is that a uniform, beautiful, and high-quality ground surface without streaks can be obtained.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing a grinding method of the present invention, FIG. 2 is a configuration and control block diagram of an embodiment of the present invention, and FIG. 3 is a schematic diagram showing a conventional grinding method. Tet...Whetstone, 2...Go-pull, 3...Workpiece, 9
a, 9b... limit switch, 10... signal processing device, 11... lateral feed motor control device, 12... lateral feed motor, 13... lateral feed amount setting device.

Claims (1)

[Scope of Claims] 1. A surface grinding method characterized in that in a horizontal axis square table type surface grinder, lateral feed is applied only at one stroke end of the table reciprocating motion. 2. In a horizontal axis square table type surface grinder, a device for detecting a stroke end on one side of table reciprocating motion, a device for setting a lateral feed amount of a saddle traverse feed motor, and a device for detecting a stroke end on one side of the table reciprocating motion, and a device for setting a lateral feed amount from the side feed amount setting device and the one side stroke end detecting device. A surface grinding machine comprising: a lateral feed motor control device that drives a lateral feed motor in response to a signal.