JP2890114B2 - Grinder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling a grinding wheel spindle head in a grinding machine.

[0002]

2. Description of the Related Art Conventionally, a vertical grinding machine for grinding a disk-shaped grinding wheel rotated by an electric motor from above a workpiece to a desired cutting amount has hitherto contacted a rotating grinding wheel with a workpiece first. Then, the height of the grinding surface of the grinding wheel in the state where sparks are generated or the grinding water is changed is checked on a scale, and then the grinding amount, the cutting amount and the like are visually checked while reading the scale.

[0003] However, these operations must be performed based on the intuition and experience of the processing operator, and the conditions vary depending on the processing shape and material of the workpiece. Takes a long time.

[0004] In addition, depending on intuition and experience, even a small error may damage the grinding wheel or apply excessive stress to the workpiece, which may adversely affect the grinding accuracy. It is.

[0005]

The problem to be solved is that, as described above, according to the prior art, a rotating grinding wheel is first brought into contact with a workpiece, and the state of sparks and changes in grinding water are reduced. In a vertical grinding machine that checks the height of the grinding surface of the grinding wheel in the state on the scale, and then visually grinds the grinding amount, cutting amount, etc. while referring to the scale, based on the intuition and experience of the processing operator, It is necessary to perform those tasks, so that skill of skilled workers is required and not everyone can process it.Because it depends on intuition and experience, even a single error can damage the grinding wheel Another problem is that excessive stress is applied to the workpiece, which may adversely affect the grinding accuracy.

[0006]

According to the present invention, there is provided a grinding machine which solves the above-mentioned problems and which enables anyone to perform high-precision grinding without relying on the intuition and experience of a skilled worker. The upper and lower screws for raising and lowering the grinding wheel spindle head, the upper and lower nuts screwed to the upper and lower screws, are integrally fastened with the upper and lower nuts, and an outer cylinder An inner cylinder whose circumference is slidably mounted, a free piston mounted on the upper part of the inner cylinder and slidably mounted on the inner circumference of the upper part of the outer cylinder, integrally fastened to the inner circumference of the upper part of the outer cylinder, Consists of a lid on which the free piston is slidably mounted, a detector for detecting the change in the relative position between the upper and lower nuts and the outer cylinder or the inner cylinder and the outer cylinder, and is surrounded by the upper part of the free piston, the inner circumference of the outer cylinder, and the lid. In the gap, grinding wheel by the regulator Heads or others in a state allowed to flow into low pressure to pressure-regulated pressure fluid than the pressure floats, moved down the grinding wheel spindle head to rotate the upper and lower thread, the processing surface of the grinding wheel, against the top surface of the workpiece Check that the contact
The present invention provides a grinding machine characterized in that the grinding machine is configured to be detected by an ejection device and used as a reference of a grinding cut amount.

[0007]

Embodiment 1 Next, an embodiment will be described in detail with reference to the drawings. FIG. 1 is a front view of a vertical surface grinding machine according to the present invention, and FIG. 2 is a cross-sectional view of a grinding wheel spindle head portion for explaining a grinding wheel spindle head vertical mechanism according to the present invention.

A grinding wheel spindle head H, which is mounted on the rails 2 of the chassis 1 so as to be able to move up and down, rotates the grinding wheel A by a spindle motor M1 and turns the upper and lower screws 3 by rotating the upper and lower motors M2. The workpiece W, which is lowered by moving it, is rotated by a table motor M3, and a workpiece W, which is mounted and fixed on a table T, is ground by a grinding wheel A, which is rotated from above. Is what it is.

The vertical motor M2 can be controlled with high accuracy by a closed-loop control servomotor or a pulse motor equipped with an encoder. It is possible.

The power of the vertical motor M2 is transmitted to the upper and lower screws 3 by the timing belt 4, and the upper and lower nuts 5 are raised and lowered by the rotation of the upper and lower screws 3. The inner cylinder 6 is fitted and fastened integrally with the upper and lower nuts 5, and an outer cylinder 8 and a lower inner circumference are slidably mounted on the outer periphery thereof via a bush 7.

The lower part of the outer cylinder 8 is slidably mounted on the outer circumference of the inner cylinder 6 via the bush 7 as described above, and the free piston 9 slides on the inner circumference of the upper part. Mounted freely. A free piston 9 is mounted on the upper surface of the inner cylinder 6.

The outer periphery of the lower portion of the free piston 9 is slidable on the inner periphery of the upper portion of the outer cylinder 8, and the outer periphery of the upper portion is the lid 1.
0, slidably mounted on the inner circumference. Lid 10,
The outer circumference of the lower part is fitted and fastened to the inner circumference of the upper part of the outer cylinder 8, and the inner circumference is slidably mounted with the free piston 9.

An airtight seal 1 is provided on the free cylinder 9 side of the sliding surface between the outer cylinder 8, the upper inner circumference and the free piston 9 and the lower outer circumference.
1, is attached. Similarly, an airtight seal 11 is attached to the lid 10 on the side of the sliding surface between the lid 10, the lower inner periphery and the free piston 9, and the upper outer periphery.

Therefore, a gap V is formed by the upper inner periphery of the outer cylinder 8, the free piston 9, and the lower surface of the lid 10. In order to allow the pressure fluid to flow into the gap V, the outer cylinder 8,
A hole is provided in a portion facing the gap V of the
And the regulator R installed on the side of the grinding machine body.

At the flange portion of the inner cylinder 6, a limit switch SW is installed as means for detecting the displacement of the outer cylinder 8 with respect to the inner cylinder 6, and the lower switch SW, A screw 13 is provided at a position facing the.

A spindle head H is fastened to the outer cylinder 8. The above is the configuration of the vertical grinding machine according to the present invention.

Next, the operation of the vertical grinding machine according to the present invention will be described. The pressure in the gap V, is adjusted to be slightly lower than the pressure at which the grinding wheel spindle head H floats in advance by adjusting the regulator R. In this state, the limit switch SW is pressed by the bottom surface of the screw 13 and the electrical connection is assumed to be off.

While maintaining the above state, the spindle motor M1 and the table motor M3 are started and the grinding wheel A,
Then, the table T on which the workpiece W is mounted and fixed on the upper surface is rotated, and then the vertical motor M2 is started to lower the grinding wheel spindle head H and the whole workpiece W in the direction.

If the descent is continued, the rotating grinding wheel A first comes into contact with the workpiece W. However, the grinding wheel spindle head H is in a state where it can be easily levitated by the pressure in the gap V. Therefore, the cut hardly occurs, and the position in contact with the workpiece W is maintained. Accordingly, the outer cylinder 8, which is integral with the grinding wheel spindle head H, moves upward with respect to the upper and lower nuts 5, and the inner cylinder 6, which is integral with the upper and lower nuts 5, so that the bottom surface of the screw 13 is separated from the upper surface of the limit switch SW, and Connection is turned on.

The position where the limit switch SW is turned on is used as a reference for measuring the cutting amount in the grinding process, and the upper and lower motors M2 are rotated by a desired cutting amount set in advance by the machining operator to perform the grinding. Processing is done.
Therefore, even when the wear state of the grinding wheel A changes, the reference position can be recognized each time processing is performed, so that the grinding can be performed without considering the wear of the grinding wheel A. In addition, even when the wear state of the grinding wheel A, or the height of the workpiece W, changes, the grinding is performed without considering the wear of the grinding wheel A, and the height of the workpiece W. Processing can be done.

[0021]

As described above, according to the present invention, the upper and lower screws for moving the spindle head up and down, the upper and lower nuts screwed to the upper and lower screws, and the upper and lower nuts are integrally fastened, and the inner periphery of the outer cylinder slides on the outer periphery thereof. An inner cylinder that is freely mounted, a free piston that is mounted on the upper part of the inner cylinder and is slidably mounted on the inner circumference of the upper part of the outer cylinder, and is fastened integrally to the inner circumference of the upper part of the outer cylinder, and slides the free piston on the inner circumference. It consists of a lid movably mounted, a detector for detecting the change in the relative position between the upper and lower nuts and the outer cylinder or the inner cylinder and the outer cylinder, and the upper part of the free piston and the inner circumference of the outer cylinder, in the gap surrounded by the lid With the pressure fluid adjusted to a pressure lower than the pressure at which the grinding wheel spindle head floats by the regulator, the upper and lower screws are turned to lower the spindle head of the grinding wheel, and the machining surface of the grinding wheel is , Add
Detection of contact with the upper surface of the workpiece by the above detection device
The grinding machine is characterized in that it is configured to be a reference for the grinding depth of cut, and the operator performing the grinding process visually scales the height of the grinding surface of the grinding wheel based on intuition and experience. It is no longer necessary to perform grinding while checking the grinding amount, cutting amount, etc. on the scale, so that even if the work shape or material of the workpiece changes, the grinding work can be easily performed, This will not damage the vehicle or apply excessive stress to the workpiece, which will not adversely affect the grinding accuracy.

In the present embodiment, the limit switch SW has been described as an example of a means for detecting the displacement of the outer cylinder 8 with respect to the inner cylinder 6, but, for example, a photoelectric sensor may be used instead of the limit switch. If a proximity switch or the like is used, the displacement of the outer cylinder 8 can be detected with higher accuracy.

[0023]

[Brief description of the drawings]

FIG. 1 is a front view of a vertical surface grinder according to the present invention.

FIG. 2 is a sectional view of a grinding wheel spindle head portion.

[Explanation of symbols]

 A: Grinding wheel M1: Spindle motor M2: Vertical motor M3: Table motor H: Spindle head W: Workpiece T: Table R: Regulator V: Air gap SW: Limit switch 1 ... Chassis 2 ... Rail 3 ... Vertical screw 4 ... Timing belt 5… Vertical nut 6… Inner cylinder 7… Bush 8… Outer cylinder 9… Free piston 10… Lid 11… Hermetic seal 12… Pipe 13… Screw

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-174873 (JP, A) JP-A 62-11559 (JP, U) JP-A-1-66964 (JP, U) 42352 (JP, B2) Jikken 47-23756 (JP, Y1) (58) Field surveyed (Int. Cl. ⁶ , DB name) B24B 47/22 B24B 47/10-47/14

Claims (1)

(57) [Claims] 1. An upper and lower screw for moving a grinding wheel spindle head up and down, an upper and lower nut screwed to the upper and lower screw, an inner cylinder which is fastened integrally with the upper and lower nut, and which has an outer cylinder inner periphery slidably mounted on its outer periphery. A free piston mounted on the upper part of the cylinder and slidably mounted on the inner circumference of the upper part of the outer cylinder; a lid fastened integrally with the inner circumference of the upper part of the outer cylinder and slidably mounting the free piston on the inner circumference thereof; A detector for detecting the change in the relative position between the nut and the outer cylinder or the inner cylinder and the outer cylinder, and the grinding wheel spindle head is regulated by the regulator in the gap surrounded by the upper part of the free piston, the inner circumference of the outer cylinder, and the lid. With the pressure fluid adjusted to a pressure lower than the rising pressure flowing, the upper and lower screws are turned to raise the grinding wheel spindle head downward, and the working surface of the grinding wheel contacts the upper surface of the workpiece. Above contact
A grinding machine characterized by being configured to be detected by a detection device and used as a reference for a grinding cut amount.