JPS6130842B2 - - Google Patents

Description

[Detailed Description of the Invention] When cutting the side surface of a workpiece with a cylindrical grinder, the present invention pursues machining accuracy to the utmost by adjusting the orthogonality between the side surface of the rotary grindstone and the center of rotation of the workpiece. This invention relates to a grinding accuracy adjustment device.

In a cylindrical grinder, the degree of perpendicularity between the rotation center of the set workpiece and the side surface of the rotating grindstone determines the machining accuracy. In other words, the side surface of the rotary grindstone is adjusted to be perpendicular to the center line connecting the main spindle and the center of the tailstock, but in a cylindrical grinder that has been used hard for a long time, the bottom surface is worn out and the tailstock is The table often sinks, and even if it is new, if a heavy workpiece is set, it will be affected by the weight of the workpiece,
It becomes impossible to ensure sufficient grinding accuracy (in microns) on the side surface. Conventionally, the tightening bolts are loosened, the tailstock is lifted up, aluminum foil, cellophane paper, etc. is inserted between the bed surface and the tailstock, and the tightening bolts are tightened again. This is countered by lifting and supporting the tailstock by the thickness of the tailstock, but the adjustment method relies solely on experience and feeling, and the levelness of the side surface is confirmed by cutting marks and readjusted over and over again. Therefore, it takes a lot of time and effort to complete the adjustment. In particular, when grinding gauges that require near-ultimate precision (inspection gauges, work gauges, parts for general gauges, etc.), even the slightest error cannot be tolerated. Adjustment is extremely inefficient. Moreover, since the shapes and sizes of the gauges to be machined vary, readjustments must be made each time the workpiece is replaced.

Here, checking the horizontality of the side surface from the cutting marks means that in cutting under ideal conditions, the border is the line connecting the rotation center of the workpiece and the rotation center of the grindstone.
On the side of the workpiece, cutting marks from the grindstone running in symmetrical directions are carved in a striped pattern, and when the two patterns overlap, a net pattern appears as a whole. However, if the center is off, there will be a non-contact area between the grindstone and the workpiece, and a mesh pattern will not be formed, but only a striped pattern in one direction, which can be visually confirmed as uneven contact. Therefore, this method has conventionally been used to check levelness.

Therefore, the present invention enables continuous adjustment of the height of the tailstock while observing cutting marks when adjusting the side surface machining accuracy of a cylindrical grinder. A screw hole passing vertically is provided in the fixable housing below the workpiece mounting side, a bolt is screwed into the screw hole from above, and a contact member is rotatably fitted to the protruding lower end of the bolt. With,
A rotary handle is detachably provided on the head of the bolt, and as the bolt rotates, the abutment member presses the bed surface to apply lifting force to the tailstock.

Next, an embodiment of the present invention will be described below based on the drawings.

In FIG. 1 showing a cylindrical grinding machine to which the side grinding accuracy adjusting device of the present invention is installed, 1 is a bed, 2 is a headstock, and 3 is capable of sliding on the bed 1 and fixing it at a predetermined position on the bed. A tailstock is provided, the tailstock 3 being attached to the bed surface by fasteners 4. Reference numeral 5 denotes a rotary grindstone provided perpendicularly to the rotation center line connecting the center 2a of the headstock 2 and the center 3a of the tailstock 3, and is placed in contact with the side surface of the workpiece M set between the two centers. Grind the side surface smooth.

A workpiece side surface grinding precision adjustment device is attached to the lower part of the workpiece attachment side of the tailstock 3. The adjustment device has a screw hole 8 formed in the vertical direction approximately in the center of a housing that has mounting holes 6 on both sides, and an adjustment bolt 9 in the screw hole 8 with its tip protruding downward from the housing. are screwed together.
The lower part of the screw hole 8 is bored up, and the adjustment button 9
It is a recessed part 11 into which the abutting member 10 fitted at the tip of the recessed part 11 is inserted. The tip of the adjustment bolt 9 has a smaller diameter than the bolt diameter, and a groove 12 is provided around the small diameter portion. On the other hand, the contact member 10 is
It is made of synthetic resin and has a cylindrical shape with a hemispherical tip.
A bottomed hole into which the small diameter portion of the adjustment bolt 9 can be loosely inserted is opened at the rear end, and a screw hole 13 is formed on the side surface. The corresponding contact member 10 is rotatably mounted with a set screw 15 by fitting a thrust bearing 14 into a small diameter portion of the adjustment bolt 9 and loosely inserting the small diameter portion into a bottomed hole. Also, the adjustment bolt 9 is
A thread formed in a predetermined range in the longitudinal middle portion is shaved off, and a donut-shaped scale plate 16 is provided around the hexagonal socket head of the adjustment bolt 9. The scale plate 16 has a scale 16a corresponding to a pointer 17 screwed onto the upper surface of the housing 7. Furthermore, a gasket 18 is attached to the adjustment bolt insertion side of the screw hole 8 to prevent cutting debris, cooling water, etc. from entering the screw hole 8, and a hexagonal hole in the head of the adjustment bolt 9 is fitted with a gasket 18. , a hexagonal wrench 19 is removably attached so that the adjustment bolt can be rotated using the hexagonal wrench as a handle.

When the cylindrical grinding machine equipped with the grinding accuracy adjustment device performs side surface grinding of a workpiece, the perpendicularity between the rotational center line of the workpiece, which is supported and rotated by both centers, and the side surface of the grindstone becomes out of alignment. If it is, then when test grinding is performed, a striped pattern will appear on one side where only one side has been ground. Therefore, I rotated the hexagonal wrench to press the contact member against the bed surface, and gradually lifted the side of the tailstock where the workpiece was mounted against the tightening force of the tightening bolt, while observing changes in the pattern on the cut surface. ,
If the rotation of the wrench is stopped when the cutting marks become a mesh pattern, this state becomes the accurate adjustment position.
In this way, adjustments can be made while observing the condition of the cutting surface, making it easy and reliable.

In the grinding accuracy adjusting device of this embodiment, since the contact member is rotatable and made of synthetic resin, the contact member does not rotate even when the adjustment bolt is rotated, and is soft, so the bed surface is not scratched. The parallel accuracy of the bed surface is not impaired. In addition, since the adjustment bolt does not have a thread in the middle, there is little rotational resistance of the adjustment bolt.A thrust bearing is attached to the contact member, so it can be rotated smoothly. The attached scale plate makes it easy to determine the rotation angle of the adjustment bolt. Furthermore, since a removable hexagonal wrench is used in the handle, if you are continuously cutting items of the same size and do not need to make adjustments each time, you can remove it and it will not get in the way.
If the angle of rotation is too large and it hits the side of the tailstock, you can conveniently replace it.

The material of the contact member is not limited to synthetic resin, but may be metal as long as it is softer than the material of the bed.

As described above, according to the present invention, conventional paper or the like is inserted into the gap between the bed and the tailstock, experimental cutting is performed to check the accuracy, correction is made by changing the thickness of the paper, etc., and the test is performed again. The time required for adjustment is reduced because the height of the tailstock can be continuously changed while observing the cutting surface, which is a cumbersome task of repeatedly making adjustments based on the feeling of rough cutting and correction. Conventional 1/
It is significantly shortened to 10 to 1/15 and is extremely efficient. In addition, since adjustment is possible just by operating the handle, anyone can easily perform it and it is highly safe. Furthermore, it is easy to install on the cylindrical grinder currently in use.
By simply attaching the device of the present invention to the cylindrical grinder, productivity can be improved and the benefits are substantial.

[Brief explanation of the drawing]

Figure 1 is a front view of a cylindrical grinder equipped with a side grinding accuracy adjustment device, Figure 2 is a perspective view of the side grinding accuracy adjustment device, and Figure 3 is a plan view of the same side grinding accuracy adjustment device. , FIG. 4 is a cross-sectional explanatory diagram of the same side surface grinding accuracy adjustment device. 1... Bed, 2... Headstock, 2a... Center, 3... Tailstock, 3a... Center, 4... Fastener, 5... Rotary grindstone, 6... Mounting hole, 7... Housing, 8...Screw hole, 9...Adjustment bolt, 10
...Abutting member, 11...Concave portion, 12...Concave groove,
13...Screw hole, 14...Thrust bearing,
15...Set screw, 16...Scale plate, 16a...
Scale, 17...Pointer, 18...Patzkin, 19...
...Hexagonal wrench, M...Workpiece.

Claims (1)

[Claims] 1. A screw hole is provided at the bottom of the workpiece attachment side of the tailstock that penetrates vertically into the fixable housing, a bolt is screwed into the screw hole from above, and the abutment member is rotated to the protruding lower end of the bolt. In addition to being movably fitted,
A cylindrical grinder characterized in that a rotating handle is detachably provided on the bolt head, and as the bolt rotates, the abutment member presses the bed surface and applies lifting force to the tailstock. Accuracy adjustment device for grinding the side of the board.