JP5283019B2 - Core corrector for machine tools - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem of a machine tool like a cylindrical grinding machine that aging deterioration sometimes causes core displacement, and this can cause the lowering of processing accuracy. <P>SOLUTION: An object is applied to a place causing core displacement which is configured of first engaging means 1a, 1b having holes 6a, 6b engaged with a columnar structure or an object having the structure and spherical back faces; bearing means 2a, 2b bearing the engaging means; a second engaging means 4 having a hole 7 engaged with a groove for storing the bearing means, the columnar structure or the object having the structure; and fixing means 3a, 3b fixing the bearing means to a specific position in the second engaging means. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

The present invention relates to a machine tool such as a cylindrical grinder, and more particularly to a technique for correcting misalignment of a rotating shaft or the like that the device has due to aging.

As a prior art, first, in order to correct the center axis misalignment in a cylindrical grinder, the center axis is decentered in advance with respect to the rotation axis of the tailstock shaft, and the degree thereof can be adjusted with an adjustment knob ( For example, see Patent Document 1).

In cylindrical grinder, there is performed a taper correction by causing contact the touch sensor provided in the wheel head to the measurement cylindrical portion provided on the heart press center of the headstock of the reference locus and the tailstock. (For example, see Patent Document 2)

In some cylindrical grinding machines, a hemispherical stopper is swingable through a spherical joint to support a workpiece. (For example, see Patent Document 3)

In addition, there is one that can adjust the eccentricity of two shafts via a ball and a bearing (see, for example, Non-Patent Document 1).

Japanese Patent Laid-Open No. 11-19806 (FIG. 1)

JP-A-6-114702 (FIG. 1)

JP 2000-24917 A (FIG. 4)

Catalog by MISUMI Corporation, product name: FLCL (search at http://jp.misumi-ec.com/tool/)

When processing metal or the like precisely, the accuracy with which the workpiece is supported and the relative positioning accuracy between the workpiece and the tool may greatly affect the machining accuracy of the workpiece.

For example, in cylindrical grinding, the work is supported or gripped by the headstock and the push cup, but the rail on the bed is worn by the reciprocating motion of the push cup for many years, and the tip of the center attached to the push cup is attached to the headstock. It may become lower than the tip of the center.

If the workpiece is subjected to cylindrical grinding in this state (that is, in the state of misalignment), the workpiece will rotate in an inclined state with respect to the bed surface, and the contact condition of the grindstone will be different at one end and the other end of the workpiece. Machining accuracy will not be improved.

Further, in the drilling machine, when the accuracy of the relative position for gripping the work and the rotation center of the drill is poor, it is impossible to make a hole at the work center with high accuracy.

In order to solve this problem, for example, in Patent Document 1, the center of the push cup is decentered, and compensation is adjusted to eliminate the misalignment.

However, in this adjustment, the misalignment is corrected by measuring the misalignment with the eye or using a measuring instrument and turning the adjustment knob appropriately.

Therefore, it can be said that the accuracy depends on the accuracy of the eye measurement or measuring instrument and the accuracy of the adjustment knob.

In addition, as shown in Patent Document 2, there is one in which the misalignment is measured electronically and the result is reflected in the taper correction.

However, it can be said that the processing accuracy by this method was dependent on electronic measurement accuracy.

A hole for fitting with a columnar structure or a structure having the structure, a center axis that coincides with the center axis of the hole, and a center axis of a recess or hole of the bearing means described below, and a center axis of the hole A first fitting means having a spherical back surface for matching , a bearing means having a spherical recess or circular hole for bearing the spherical back surface of the first fitting means, and A second fitting means having a groove for storing the bearing means and a columnar structure or a hole for fitting with the structure having the structure, and identifying the bearing means in the second fitting means Is attached to the side that supports or grips the workpiece, and is further attached to the workpiece, and then supports or grips the other end of the workpiece, or a bite etc. To process. (Hereinafter referred to as the first invention.)

Alternatively, the first support means for supporting or gripping the workpiece and the second support means or a cutter that supports and grips the opposite side of the workpiece, and is cut or ground. In a machine tool including a processing means for performing processing or the like as a component, the second support means having a columnar protrusion or the processing means or the first support means and the first support having a groove fitted to the protrusion. One supporting means or the second supporting means or the processing means, and a position adjusting means for adjusting a relative position between the first supporting means and the second supporting means or the processing means are provided. (Hereinafter referred to as the second invention.)

Alternatively, the first support means for supporting or gripping the workpiece and the second support means or a cutter that supports and grips the opposite side of the workpiece, and is cut or ground. In a machine tool including processing means for performing processing or the like as a component, the first or second support means supports a columnar structure supported or gripped by the first or second support means or the gripping means. Alternatively, the second or first support means or the processing means paired with the means for supporting or holding the structure by the position adjusting function of the processing means or the position adjusting function added to the means is the structure. The position of the first or second support means or the processing means is moved to a position where the other end of the structure can be supported or gripped, and both ends of the structure are moved to the first The first support means in the machine tool by fixing the position of the first or second support means or the processing means in a state supported or gripped by the holding means and the second support means or the processing means And misalignment between the second support means and the processing means are corrected. (Hereinafter referred to as the third invention.)

In carrying out the first invention, for example, the shape of the hole for fitting with the columnar structure or the structure having the structure in the first fitting means is the shape of the tip of the center mounted on the headstock. Keep them consistent.

Further, the shape of the hole for fitting with the columnar structure in the second fitting means or with the structure having the structure is made to coincide with the shape of the tip of the center mounted on the push cup.

Then, the center is first mounted on the headstock, and the first fitting is performed by fitting the hole for fitting with the columnar structure or the structure having the structure of the first fitting means. The means is mounted on the headstock.

On the other hand, the bearing means is mounted in the groove of the second fitting means, and the fixing means is loosened to such an extent that the bearing means can slide freely within the second fitting means.

Further, the center is mounted on the push cup, and the second fitting means is formed by fitting a hole for fitting with the columnar structure or the structure having the structure of the second fitting means described above. The bearing means and the fixing means are mounted on the push cup.

Further, the push cup is moved on the bed with the headstock facing.
In this process, the bearing means having a spherical recess or a circular hole is brought into contact with the spherical back surface of the first fitting means, whereby the spherical recess of the bearing means and the central axis of the spherical back surface. Alternatively, a force is received from the abutting portion in a direction in which the center axis of the circular hole coincides, and finally the center axis of the spherical back surface of the first fitting means and the spherical recess or circular shape of the bearing means The position where the center axis of the hole coincides, that is, the center axis of the hole for fitting with the columnar structure of the first fitting means or the structure having the structure and the spherical recess or circular hole of the bearing means. Moves to a position where the central axes coincide with each other, and stably stops there.

Then, the fixing means is tightened when the back surface on the spherical surface of the first fitting means and the bearing means come into close contact with each other so that the bearing means becomes a columnar shape of the first fitting means in the groove of the second fitting means. The center axis of the hole for fitting with the structure or the structure having the structure is fixed at a position where the center axis of the spherical recess or the circular hole of the bearing means coincides .

If the push cup is separated from the headstock in this state and the work is mounted on the first fitting means side, the work will rotate around the straight line connecting the center of the headstock center and the center of the fixed bearing means. become.

The newly formed rotating shaft duplicates the rotating shaft of the center mounted on the headstock, and the accuracy of the rotating shaft of the workpiece according to the present invention is the center rotating shaft mounted on the headstock. It can be said that the accuracy is approximately the sum of the accuracy of the hole for fitting with the columnar structure or the structure having the structure in the first fitting means.

Therefore, according to the first invention, for example, the accuracy of the rotation shaft of the center mounted on the headstock and the hole for fitting with the columnar structure or the structure having the structure of the first fitting means are provided. If both the accuracy is several micrometers, the same misalignment accuracy can be easily achieved without using a measuring instrument. If the processing accuracy of these articles is further increased, the processing As the accuracy increases, the accuracy of the misalignment can also be improved.

The second invention is an application of the principle of the first invention.

For example, in a cylindrical grinder, a tapered column having a tapered shape is mounted in advance on the upper part of the headstock, while a hole precisely fitting with this is mounted on the upper part of the push cup.

Furthermore, the function which can carry out height correction | amendment of the whole push cup to an up-down direction is mounted.

When the push cup is brought closer to the headstock in this state, the tip of a tapered cylinder having a tapered shape mounted on the upper part of the headstock enters the entrance of the hole for fitting with the push cup side.

In this state, the height adjustment function mounted on the push cup is loosened and the push cup is further pushed into the headstock in a state where it can freely move up and down.

Then, the cylinder mounted on the upper part of the headstock is a tapered cylinder having a tapered shape, and the shape of the hole for fitting with this on the push cup side is a conical hole tapered at the back. Then, when the push cup is pushed into the headstock, the push cup stops at a stage where both of them are completely fitted.

At this stage, the central axis of the cylinder mounted on the upper part of the headstock and the central axis of the hole for fitting with this on the push cup side coincide.

Here, the distance between the center rotation axis of the headstock and the center axis of the cylinder mounted on the headstock in advance, the center rotation axis of the press cup and the cylinder mounted on the headstock mounted on the push cup By matching the distance between the center axis of the hole for fitting and the cylinder mounted on the headstock and the hole mounted on the push cup, the center on the headstock is adjusted. And the rotation axis of the center of the push cup can coincide with each other.

The accuracy of misalignment at this time is roughly the accuracy of the center rotation axis of the headstock, the accuracy of the distance between the rotation axis and the center axis of the cylinder mounted on the headstock, and the accuracy of the center rotation axis of the push cup. And the total accuracy of the distance between the rotation axis of the center of the push cup and the center axis of the hole for fitting with the cylinder mounted on the headstock mounted on the push cup.

However, in the second invention as well, it can be said that the misalignment of the machine tool can be corrected easily and with high accuracy according to the first invention.

In the second invention, it is possible to make the shape of the hole mounted to the cylinder mounted on the upper part of the headstock and the cylinder mounted on the upper part of the push cup into a shape without a taper. In order to fit the two, play is required, and the accuracy is inferior to the case of having a taper.

The third invention also applies the principle of the first invention.

For example, in a drilling machine, when a work table that can freely move in the horizontal direction is mounted in a state where the drilling machine grips the workpiece, first, instead of the workpiece, a cylindrical shape with a cylindrical hole in the central axis Mount the jig.

Next, instead of the drill, a cylindrical rod having a tapered tip and a diameter smaller than the diameter of the hole opened at the center of the cylindrical jig is held by the drill chuck.

Next, the cylindrical rod is lowered until the tip of the cylindrical rod enters the diameter of the hole opened at the center of the cylindrical jig.

Here, the above-mentioned work table is made freely movable in the horizontal direction, and the above-mentioned cylindrical bar is lowered.

Then, the lowering of the cylindrical rod stops at the stage where the periphery of the tip of the rod contacts the edge of the diameter of the hole opened at the center of the cylindrical jig.

At this stage, the central axis of the above-mentioned cylindrical rod coincides with the central axis of the hole opened at the center of the above-mentioned cylindrical jig.

If one worktable is fixed in this state, a cylindrical workpiece is gripped instead of the cylindrical jig described above, and a drill is held by the drill chuck instead of the cylindrical rod described above, the center of the workpiece A hole can be accurately drilled on the shaft.

The accuracy of misalignment at this time can be said to be the sum of the accuracy of the center axis of the drill and the accuracy of the work table that holds the workpiece.

However, in the third invention as well, it can be said that the misalignment of the machine tool can be corrected simply and with high accuracy as in the first invention.

It is sectional drawing in embodiment of 1st invention. It is sectional drawing of the cylindrical grinding machine in embodiment of 2nd invention. It is a rear view of the cylindrical grinder in embodiment of 2nd invention. It is sectional drawing of the drilling machine in embodiment of 3rd invention. Side view of jig used in cylindrical grinding machine in embodiment of third invention It is a side view of the eccentric jig | tool in embodiment of 3rd invention.

FIG. 1 shows a cross-sectional view of the best embodiment of the first invention.

1 in 1a and 1 b is a first fitting means separated, 2a and 2b is a cross section of the bearing means 2 an open circular hole in the center of the square, 3a and 3b are set screw, 4 is a second fitting means, 5a and 5b are cross sections of the cylindrical workpiece 5, and 6a and 6b are holes for fitting the first fitting means to a columnar structure or the like. , 7 are holes for fitting the second fitting means 4 to a columnar structure or the like, 8a and 8b are screw holes for fastening the first fitting means 1a and the work 5, and 9a And 9b are screw holes for fastening the first fitting means 1b and the second fitting means 4, 10 is a fool hole, and 11a, 11b, 11c and 11d are packings.

When the first invention is applied to the cylindrical grinding machine, it can be mounted in the center hole of the tailstock, and a cylindrical jig having a tapered shape that fits into the hole 6a and the hole 6b (hereinafter referred to as jig A). ) is prepared.

Furthermore, a cylindrical jig (hereinafter referred to as jig B) having a shape that can be mounted in the center hole of the push cup and whose tip is fitted in the hole 7 is prepared.

Therefore, the work 5 is first fitted into the first fitting means 1a, and the work 5 is fixed to the first fitting means 1a using the screw holes 8a and 8b.

Next, the jig A is mounted on the headstock, and the above-mentioned combined work 5 and the first fitting means 1a are mounted thereon.

On the other hand, the bearing means 2 is arranged in the back of the groove of the second fitting means 4, and the screwing 3a and 3b is loose so that the bearing means 2 can slide freely in the back of the groove of the second fitting means 4. The first fitting means 1b that has been tightened and separated is pushed in.

Thereafter, the jig B is mounted on the push cup, and the screws 7a and 3b, the bearing means 2 and the first fitting means 1b are fitted together so that the hole 7 of the second fitting means 4 is fitted to the tip. The second fitting means 4 is attached to the push cup.

Then, the first fitting means 1b attached to the tip of the push cup is moved on the bed toward the first fitting means 1a attached to the headstock.

When the first fitting means 1b and the first fitting means 1a are fitted via the jig A, the central axis of the hole 6b for fitting with the columnar structure or the like of the first fitting means 1b And the center axis of the hole 6a for fitting with the columnar structure or the like of the first fitting means 1a coincide with each other through the jig A , and the first fitting means 1b is sufficiently in contact with the bearing means 2. The stage of contact , that is, the central axis of the spherical back surface of the first fitting means 1b, that is, the central axis of the hole 6b for fitting with the columnar structure or the like of the first fitting means 1b and the bearing means 2 first mating means 1b of the spherical circular for bearing the rear of the hole center axes matched stage set screw 3a, the position of the bearing means 2 against the first mating means 1b tighten 3b To fix.

Finally, the push cup is once separated from the headstock, and the first fitting means 1b and the second fitting means 4 are connected using the thin screw, the screw hole 9a, and the screw hole 9b, and then the first If the invention 5 and the workpiece 5 are supported strongly from both sides by the pressing cup and the headstock, the workpiece 5 can be cylindrically ground.

Since in this state is the central axis of the circular hole of the rotary shaft and the bearing means 2 of the central axis and the jig A of rotation of the first mating means 1a and 1b are the same, Osamu the jig A Even if the central axis of the tool B is deviated, highly accurate cylindrical grinding with almost no misalignment is possible.
In the present embodiment, the first fitting means is separated into 1a and 1b for the convenience of work, but this is not an essential component of the present invention, and the first fitting means 1a. Even if it is the form which 1b and 1b united from the beginning, there exists the same effect.
There are an infinite number of fixing methods for the workpiece 5, and even if the workpiece 5 is fixed by means other than the screw holes 8a and 8b, high-precision cylindrical grinding is possible.

FIG. 2 shows a cross-sectional view of a cylindrical grinder in the embodiment of the second invention.

In FIG. 2, 12 is a headstock, 13 is a push cup, 14 is a bed, 15 and 16 are center holes, 17 is a projection having a cylindrical shape with a tapered tip, 18 is A groove having a shape to be fitted to the protrusion 17, 19 is a top plate, 20 is a set screw, 21a and 21b are side plates, and 22 is a handle for applying a force to the center of the push cup. , 25 is a cam, 24 is a cam shaft, and 22 is a lever for rotating the cam 25.

FIG. 3 shows a rear view of the cylindrical grinding machine according to the second embodiment.

In FIG. 3, 26 is a line indicating the bottom of the press cup body.

In the second embodiment of the present invention, the push cup 13 has a push cup body including a center hole 16 supported by a cam 25 at the bottom, and the push cup body is provided in the vertical direction provided in the side plates 21a and 21b. It can move up and down along the rail, and is further pressed from above by a set screw 20 via a top plate 19.

The cam 25 is eccentrically fixed by the cam shaft 24, and the height of the bottom portion 26 of the push cup body can be adjusted by moving the lever 23 up and down.

Further, a protrusion 17 is mounted on the upper part of the head stock 12, and a groove 18 for fitting to the protrusion 17 is mounted on the upper part of the push cup 13.

Here, when the push cup 13 is moved on the bed 14 toward the headstock 12, the tip of the protrusion 17 enters the entrance of the groove 18.

Here, the set screw 20 is loosened so that the tip of the protrusion 17 is inserted into the back of the groove 18, the height of the push cup body is adjusted slightly lower while turning the lever 23, and the push cup 13 is further moved to the headstock. Push towards 12.

Then, the protrusion 17 and the groove 18 are in a completely fitted state, and the progress of the push cup stops.

Therefore, the height of the press cup body is fixed to the height by using a screw such as a set screw 20.

If the cylindrical grinder is designed so that the distance between the center axis of the protrusion 17 and the center axis of the center hole 15 matches the distance between the center axis of the groove 18 and the center axis of the center hole 16, the protrusion 17 The center axis of the center hole 15 and the center hole 16 can be made to coincide with each other by complete fitting of the groove 18 and the groove 18.

In this way, when the second invention is used, even if the table groove surface on the bed is worn and the center of the push cup is displaced, the table groove surface is not easily worn. Can be recovered.

FIG. 4 shows a sectional view of the drilling machine in the embodiment of the third invention.

In FIG. 4, 27 is a table, 28 is a stunt, 29 is an arm, 30 is a motor, 31 is a drill chuck, and 32 is a cylindrical shape whose tip is tapered by a taper. 33a and 33b are cross sections of a square jig 33 hollowed out on the inside, 34a and 34b are cross sections of a square jig 34 hollowed out in the center at a center, and 35 A cylindrical jig having a cylindrical hole on the central axis and having the same diameter as the hollow cylindrical shape of the jig 34, and 36a and 36b are set screws.

In FIG. 4, a jig 33 is fixed on the table 27 with a bond or the like, and a jig 34 is disposed on the inside thereof.

In the jig 34, relative positions in the left-right direction in FIG. 4 with respect to the jig 33 are defined by set screws 36a and 36b.

Although not shown in FIG. 4, the relative position in the front-rear direction on FIG. 4 with respect to the jig 33 is defined by two set screws identical to the set screws 36 a and 36 b.

Further, a jig 35 is fitted in the center of the jig 34.

Further, a jig 32 is held on the drill chuck 31.

Further, the set screws 36a and 36b and two set screws similar to these are loosened so that the jig 34 and the jig 35 fitted thereto can slide freely on the table 27.

In this state, the arm 29 is first lowered until the tip of the jig 32 enters the hole formed in the center of the jig 35.

When the tip of the jig 32 enters the hole formed in the center of the jig 35, the arm 29 is further lowered.

Then, since the tip of the jig 32 has a tapered shape, the jig 35 and the jig 34 fitted thereto slide on the table 27 by the force received from the jig 32.

The lowering of the arm 29 stops in a state where the tapered portion of the jig 32 and the edge of the hole in the center of the jig 35 are in a circular contact.

This state is a state in which the central axis of the jig 32 and the central axis of the jig 35 coincide with each other, and the central axis of the hole opened in the center of the jig 34 and the central axis of the jig 32 also coincide with each other.

If the set screws 36a and 36b and two set screws similar to these are tightened in this state, the jig 34 is fixed on the table 27.

Furthermore, if a chuck having a circular handle with the same diameter as the jig 35 is mounted on the jig 34 instead of the jig 35 and a drill is mounted on the drill chuck 31 instead of the jig 32, the center axis of the chuck And the rotation axis of the drill can be made to coincide with each other with high accuracy, thereby enabling highly accurate machining.

FIG. 5 shows a side view of the jig 37 used in the cylindrical grinding machine in the embodiment of the third invention.

One end of the jig 37 is inserted into the center hole of the headstock, and the other end is inserted into the center hole of the push cup so as to be fitted to both center holes. Both ends are tapered.

In the cylindrical grinding machine having the function of adjusting the height of the center of the push cup, when applying the third invention, the jig 37 is first fitted into the center hole of the headstock, and then the jig 37 Move the push cup closer to the headstock until the end enters the center hole entrance of the push cup.

Next, while loosening the height adjustment function of the center of the push cup or adjusting the height adjustment function, the push cup is brought closer to the headstock until the other end of the jig 37 is fitted into the center hole of the push cup.

Then, with the other end of the jig 37 fitted into the center hole of the push cup, the center height adjustment function of the push cup is tightened.

In this state, the center axis of the center hole of the headstock and the center axis of the center hole of the press cup are aligned with each other via the jig 37. If attached, cylindrical grinding with high accuracy becomes possible.

The present invention is not limited to cylindrical grinders and drilling machines, and can be widely applied to machine tools that cause misalignment due to aging.

Furthermore, if this invention is used, a machine tool can be adjusted to the position decentered intentionally.

For example, if the jig 38 is applied to the third invention, the machine tool can be easily adjusted to an eccentric position.

1a, 1b First fitting means 2, 2a, 2b Bearing means 3a, 3b Set screw 4 Second fitting means 5, 5a, 5b Work piece 6a, 6b Columnar structure of first fitting means, etc. Hole 7 for fitting Holes 8a and 8b for fitting with a columnar structure or the like of the second fitting means Screw holes 9a and 9b for fastening the first fitting means and the workpiece First fitting Screw hole 10 Flanged hole 11a, 11b, 11c, 11d Packing 12 Spindle 13 Push cup 14 Bed 15, 16 Center hole 17 Projection 18 Groove 19 Top plate 20 Set screw 21a 21b Side plate 22 Handle 23 Lever 24 Cam shaft 25 Cam 26 Line indicating bottom of push cup body 27 Table 28 Stand 29 Arm 30 Motor 31 Drill chuck 32 Jig 33, 33a, 33b Jig 34 34a, 34b jig 35 jig 36a, 36b set screw 37 jig 38 jig

Claims (1)

A hole for fitting with a columnar structure or a structure having the structure, a center axis that coincides with the center axis of the hole, and a center axis of a recess or hole of the bearing means described below, and a center axis of the hole A first fitting means having a spherical back surface for matching , a bearing means having a spherical recess or circular hole for bearing the spherical back surface of the first fitting means, and A second fitting means having a groove for storing the bearing means and a columnar structure or a hole for fitting with the structure having the structure, and identifying the bearing means in the second fitting means An adapter for machine tools, characterized by comprising a fixing means for fixing at a position.

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