JPH0760639A - Work device for work having groove - Google Patents

Abstract

PURPOSE:To insert a contact part on the tip of a fork to measure an inside diameter of a work up to a position where this contact part comes into contact with a groove inner peripheral surface of the work with a simple structure without carrying out complicated control. CONSTITUTION:A fork 34 rotatable and displaceable to a main body of a fork gauge 32 is provided, and a contactor 48 is arranged on the tip. In the fork 34, a protrusion 50 to be pressed is arranged protrusively on the side closer to the rotational center than the contactor 48. A guiding member 52 to move slidingly with the protrusion 50 to be pressed is arranged on an inside surface of an electromagnetic chuck 18 to hold a work W, and the fork 34 and the contactor 48 are rotated and displaced by pressing of the protrusion 50 to be pressed by this sliding motion, so that the contactor 48 can be reached automatically up to a prescribed position on an inner peripheral surface of a groove 29.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for machining a grooved workpiece while detecting the inner diameter of the grooved workpiece by a fork gauge having a fork inserted into the workpiece. is there.

[0002]

2. Description of the Related Art Conventionally, in a grinder, particularly an inner surface grinder, when a work inner peripheral surface is machined by an inner surface grinding wheel, a change in the inner diameter of the work is often detected and monitored by a fork gauge. Measuring with such a fork gauge,
Mainly divided into a front fork gauge system and a rear fork gauge system.

An example of a front fork gauge system is shown in FIG.
Shown in. In the figure, 90 is a cylindrical electromagnetic chuck connected to an electromagnetic coil (not shown).
Thus, the work W is rotationally driven with one side of the work W being attracted and held. This work W
Inside the grindstone shaft 92 from the side opposite to the electromagnetic chuck 90.
Is inserted and is pressed against the groove 95 on the inner peripheral surface of the workpiece W while being rotationally driven together with the grindstone shaft 92, the inner peripheral surface of this groove 95 is ground.

The fork 96 for detecting the inner diameter of the groove 95 is rotatable (displaceable) in the radial direction of the workpiece about a rotary shaft (not shown) and is attached to the outside in the radial direction. It is biased and is inserted into the workpiece W from the same side (right side) as the grindstone shaft 92. The fork 96 is displaced in the radial direction with the contact 98 at the tip of the fork 96 being pressed against the inner peripheral surface of the groove 95, and the inner diameter of the groove 95 can be detected by the displacement of the fork 96. It has become.

On the other hand, the rear fork gauge system is
For example, as shown in Japanese Utility Model Publication No. 63-4600, a fork 96 is inserted into the work W from the side opposite to the grindstone shaft 92 (left side in the case of FIG. 8) and the inner diameter thereof is detected.

[0006]

In the front fork gauge system, the grindstone shaft 9 is attached from the same side as the grindstone shaft 92.
Since the fork 96 must be inserted without interfering with the wheel 2, the grindstone shaft 92 must have a small diameter and a long length, and it is difficult to obtain high support rigidity of the grindstone 94. Further, since it is necessary to avoid the interference between the grindstone 94 and the fork 96, it is not possible to use the large-diameter grindstone 94. Therefore, the life of the grindstone 94 is short, the replacement frequency increases, and the working time becomes long. Occurs.

On the other hand, also in the rear fork gauge system, the fork 96 is passed through the cylindrical electromagnetic chuck 90 while the narrow space is sewn so that the contact 98 at the tip of the fork reaches the inner peripheral surface of the groove 95. There must be. Therefore, conventionally, a means (electromagnetic type) for forcibly rotating the fork 96 is provided, and when the fork 96 is inserted, the contact 98 avoids interference with the grindstone 94 and inside the groove 95. Although a means for controlling the above-mentioned rotation drive so as to reach the peripheral surface has been taken, such rotation control is complicated and an increase in cost cannot be avoided.

In view of such circumstances, the present invention allows a fork for measuring the inner diameter of a grooved work piece to be easily inserted into the work piece without interfering with the grindstone and the work piece. The purpose is to provide a device.

[0009]

As a means for solving the above-mentioned problems, the present invention is to be inserted into a workpiece having a circumferential groove on its inner peripheral surface and be in pressure contact with the inner peripheral surface of the groove. With a grindstone for machining the inner peripheral surface and a fork that is rotatable in the radial direction of the workpiece and is biased outward, the contact portion at the tip of the fork is in contact with the inner peripheral surface of the groove. A machining apparatus for a grooved workpiece including a fork gauge for detecting the inner diameter of the groove by the displacement of the contactor, comprising fork transfer means for inserting the fork into the workpiece from the side opposite to the grindstone. While the pressed portion is provided in a portion of the fork closer to the center of rotation of the fork than the contact portion, the pressed portion is brought into contact with the pressed portion as the fork is inserted on the outside of the fork, and the pressed portion is radially inward. By pressing The fork is rotationally displaced so that the contact portion moves to the position where it comes into contact with the groove inner peripheral surface while avoiding the grindstone and the workpiece, and the contact portion reaches the position where it comes into contact with the groove inner peripheral surface. In this state, a pressing member that is separated from the pressed portion is provided (Claim 1).

Specifically, the fork is provided with a projection to be pressed outward as a pressed portion in the radial direction, while the contact portion serves as the pressing member while the contact portion avoids the grindstone and the workpiece. When moving to a position where it comes into contact with the surface, it is separated from the pressed protrusion when it reaches a position where the contact portion comes into contact with the groove inner peripheral surface and has an inner surface shape almost the same as the trajectory drawn by the pressed protrusion. It may be provided with a guide member having an inner surface shape (claim 2), while the pressing member includes a pressing projection protruding inward in the radial direction, while the fork has the pressed portion as the pressed portion. In a state where the contact portion has an outer surface shape that is always in contact with the pressing protrusion when moving to a position where the contact portion contacts the groove inner peripheral surface while avoiding the grindstone, and the contact portion reaches a position where the contact portion contacts the groove inner peripheral surface. Is it the above-mentioned pressing protrusion It may be those in which a guided member having spaced apart outer surfaces shaped (claim 3).

Further, when a cylindrical holding member for holding the work from the side opposite to the grindstone insertion side is provided, the fork transfer is performed through the inside of the holding member so that the fork is inserted into the work. Configuring the means,
Providing the pressing member on the inner surface of the holding member,
More preferable (Claim 4).

Further, in the apparatus according to the second aspect, when the workpiece is held from the side opposite to the side where the grindstone is inserted and a cylindrical holding member which is rotationally driven in this holding state is provided, the holding is provided. The fork transfer means is configured to insert the fork into the workpiece through the inside of the member, and the guide member is provided on the inner surface of the holding member,
By forming the guide member into a tubular shape having the above-mentioned inner surface shape over the entire circumference, a more excellent effect as described below can be obtained (claim 5).

[0013]

According to the apparatus of the present invention, by simply moving the fork toward the inside of the workpiece from the side opposite to the side where the grindstone is inserted, the fork to be pressed provided on the fork is moved as the fork moves. The part is pressed by the pressing member, and the fork automatically rotates in the radial direction at a predetermined timing.
The contact portion at the tip of the fork penetrates into the groove while avoiding the grindstone and the workpiece inserted into the workpiece and reaches the inner peripheral surface thereof. When the inner peripheral surface is reached, the pressed portion and the pressing member are separated from each other, and the fork can be freely rotationally displaced in the radial direction. Therefore, in this state, the fork gauge can detect the inner diameter of the workpiece based on the displacement of the contact portion, and the inner surface of the groove of the workpiece can be ground by the grindstone while monitoring the inner diameter.

More specifically, in the apparatus according to claim 2,
When the fork gauge is inserted, the pressed projection provided on the fork slides on the inner surface of the guide member while being appropriately pressed radially inward by the guide member, so that the contact portion of the fork automatically moves. It moves to a position where it comes into contact with the inner circumferential surface of the groove while avoiding the grindstone and the work.

On the other hand, in the apparatus according to the third aspect, when the fork gauge is inserted, the pressing projection appropriately presses the guided member protruding from the fork inward in the radial direction, so that the outer surface of the guided member is pushed. As the pressing projection slides relatively, the contact portion at the tip of the fork moves to a position where it comes into contact with the groove inner peripheral surface while avoiding the grindstone and the workpiece.

In the apparatus according to the fourth aspect, the fork is inserted into the workpiece through the inner side of the cylindrical holding member, and at the time of this insertion, the fork is pressed by the pressing member provided on the inner surface of the holding member. The part is pressed.

Further, in the apparatus according to claim 5, since the guide member has a tubular shape having the inner surface shape according to claim 2 over the entire circumference, the guide member is driven to rotate together with the workpiece. Also, the pressed member can be guided by the guide member regardless of the rotation phase of the holding member.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS.

In FIG. 6, a cylindrical housing 12 is erected on the bed 10, and the bearing 1 is housed in the housing 12.
The rotary cylinder 16 is rotatably supported via the shaft 4. A cylindrical electromagnetic chuck (holding member) 18 is fixed to the front surface (the right surface in FIG. 6) of the rotary cylinder 16, and an electromagnetic coil 19 is embedded on the back side thereof, and the electromagnetic coil 19 is energized. The electromagnetic chuck 18 is capable of electromagnetically attracting and holding the workpiece W.

A pulley 20 is fixed to the rear end of the rotary cylinder 16, while a rotary drive motor 22 is mounted at an appropriate position of the housing 12, and a pulley 24 fixed to its output shaft is a belt 23. It is connected to the pulley 20 via the. Therefore, when the rotary drive motor 22 is operated while the workpiece W is held by the electromagnetic chuck 18, both the rotary cylinder 16 and the electromagnetic chuck 18 are operated.
Also, the workpiece W is adapted to rotate.

A wheel head (not shown) is installed in front of the electromagnetic chuck 18, and a grindstone shaft 26 is attached to the wheel head. A grindstone 30 for inner surface grinding is fixed to a small diameter portion 28 at the tip of the grindstone shaft 26. There is. On the other hand, as shown in FIGS. 1 to 4, a pair of left and right ridges 31 are provided on the inner peripheral surface of the workpiece W, and a groove 29 having a substantially arcuate cross section is formed between them. The outer surface shape of the grindstone 30 is set so as to be ground.

A fork gauge main body 32 is inserted in the rotary cylinder 16. This fork gauge body 32
A pair of upper and lower forks 34, which are also shown in FIG. 5, are provided at the front end, and the rear end is supported by a support member 36 (FIG. 6).
The support member 36 is configured to be slidable on a rail 10 along a rail 38 extending in the front-rear direction. The support member 36 is provided with a telescopic cylinder 40, and the fork gauge main body 32 is integrally advanced and retracted by expanding and contracting a rod 42 of the telescopic cylinder 40.

As shown in FIGS.
A mounting lever 44 is fixed to the root of the fork, and the base end (the left end in FIG. 1) of the mounting lever 44 is rotatably connected to the fork gauge main body 32 about a horizontal pin (rotating shaft) 46. Has been done. Further, the fork gauge main body 32 is provided with an unillustrated biasing means such as a spring, and the fork 3 including the mounting lever 44 is provided by this biasing means.
4 is always urged outward in the radial direction (for example, the fork 34 shown in FIG. 1 is upward). Further, a contactor (contact portion) 48 is provided at the tip of the fork 34 so as to project radially outward, and the contactor 48 and the fork are in contact with the inner surface of the workpiece W. The rotational displacement of 34 is detected by an operating transformer (not shown) or the like built in the fork gauge main body 32, so that the machining inner diameter of the workpiece W is measured.

Further, as a feature of this apparatus, a projection 50 to be pressed radially outwardly is provided at a substantially intermediate portion of the fork 34, while a cylindrical guide member 52 is fixed to the inner peripheral surface of the electromagnetic chuck 18. ing. On the inner peripheral surface of the guide member 52, a tapered portion 54 in a direction in which the diameter is reduced from the rear end toward the front, a flat portion 55 continuous with the front end of the tapered portion 54, and a cross section from the front end of the flat portion 55. Notch 56 that is cut in a substantially V-shape radially outward
And are formed all around. Here, as shown in FIGS. 1 to 3, the cross-sectional shapes of the taper portion 54 and the flat portion 55 are such that the contact 48 at the tip of the fork passes over the rear protrusion 31 of the workpiece W and interferes with the grindstone 30. While avoiding, the shape is set to be substantially the same as the locus drawn by the tip of the pressed protrusion 50 before reaching the inner peripheral surface of the groove 29, and the cut portion 56 has the contact 48 as shown in FIG. The groove 29 is formed so as to be separated from the pressed protrusion 50 when the inner peripheral surface of the groove 29 is completely reached.

Next, the operation of this device will be described.

First, the work W is held by the electromagnetic chuck 18 while the electromagnetic coil 19 is energized. next,
The magnet 30 and the work W are rotated, and inside the work W,
The grindstone 30 is inserted integrally with the small diameter portion 28 of the grindstone shaft 26,
Positioned.

Next, as the telescopic cylinder 40 extends from the contracted state, the support member 36 and the fork gauge main body 32 advance, and the fork 34 gradually passes through the inside of the electromagnetic chuck 18 from the retracted position shown in FIG. Inserted inside.

Specifically, since both forks 34 are urged outward in the radial direction, as shown in FIG. 2, the pressed projection 50 first contacts the tapered portion 54 of the guide member 52 and slides. The pressed protrusion 50 and the fork 34 are
Are pressed radially inward. This allows the fork 34
The contactor 48 at the tip is automatically displaced inward in the radial direction so as to get over the rear protrusion 31.

Then, the pressed protrusion 50 slides on the flat portion 55, so that the contactor 48 is inserted into the workpiece W while keeping its radial position constant, as shown in FIG. From the time when the pressed projection 50 passes the flat portion 55, the fork 34 escapes to the outside in the radial direction, the contact 48 is substantially along the inner peripheral surface of the groove 29, that is, the grindstone 30 is avoided. Advance.

Then, as shown in FIG. 4, when the contactor 48 completely reaches the substantially central portion of the groove 29, a sufficient gap is secured between the pressed projection 50 and the notch 56. The contactor 48 can be freely displaced in the radial direction as the fork 34 rotates. Therefore, by machining the groove 29 of the workpiece W which is rotating in this state, the contact 48 is displaced radially outward in accordance with the expansion of the inner diameter of the groove due to this machining, whereby the groove 48 is machined during machining. The inside diameter is measured accurately.

As described above, according to this apparatus, the guide member 52 is provided on the inner surface of the electromagnetic chuck 18, and the pressed projection 50 on the fork 34 side is simply slid on the inner peripheral surface of the guide member 52. With a simple structure, the contactor 48 can be reliably inserted to a predetermined position on the inner surface of the groove 29 while avoiding interference between the contactor 48 and the grindstone 30 without performing complicated control.

Further, in this embodiment, the guide member 5 is used.
The tapered portion 54 and the flat portion 5 which are the guide surfaces in 2.
5 and the notch 56 are provided over the entire circumference, there is an advantage that the fork 34 can be guided regardless of the rotation phase of the electromagnetic chuck 18.

Next, a second embodiment is shown in FIG. Here, on the inner surface side of the holding member 18a fixed on the bed 10 which replaces the electromagnetic chuck 18, a guide projection 50 'similar to the guided projection 50 in the above-described embodiment is provided radially inward. A guided member 52 'is provided on the fork 34 side so as to project radially outward. Here, on the outer surface of the guided member 52 ', contrary to the guide member 52, a tapered portion 54', a flat portion 55 ', and a cut portion 56' are formed in order from the front end side. Is shown in FIG.
As shown in FIG. 3, when the contactor 48 behaves, the taper portion 54 'and the flat portion 55' are moved by the pressing protrusion 5 '.
0 ', and as shown in FIG. 7, when the contactor 48 reaches the approximate center position of the inner peripheral surface of the groove 29, a sufficient gap is formed between the cut portion 56' and the pressing protrusion 50 '. It is set to be secured.

Further, as is well known, the rotation of the work W is carried out by holding a pair of two driving rollers 57 indicated by a chain double-dashed line, and the work W is axially positioned with respect to the holding member 18a by the magnet 30. This is performed by the thrust of the drive roller 57 slightly inclined with respect to the axis line of. The rotational position of the workpiece W is determined by a support shoe (not shown).

Even in such a structure, the fork 34
Is simply moved forward from the rear position into the workpiece W, the outer surface of the guided member 52 'slides against the pressing projection 50' and is appropriately pressed radially inward. As a result, the contactor 48 can automatically reach the predetermined position of the groove 29.

In the first embodiment described above, the electromagnetic chuck 18 is provided as the holding member for holding the workpiece W. In addition, various other conventionally known chucks such as hydraulic chucks are shown. Etc. can be applied as the holding member. Further, also in a centerless grinding machine or the like which does not use a chuck, the same effect as the above can be obtained by providing a pressing member on the side opposite to the grindstone by using a dedicated supporting member or the like as in the second embodiment. It is possible.

[0037]

As described above, according to the present invention, the fork is rotationally displaced in the radial direction by the contact between the pressed portion provided on the fork and the pressing member provided on the inner surface of the cylindrical holding member. Therefore, the contact portion at the tip of the fork can reach the predetermined position of the workpiece groove without inconvenience with a simple structure without executing complicated control. Moreover, in the state where the contact portion reaches the position where it comes into contact with the inner circumferential surface of the groove, the pressed portion and the pressing member are separated from each other. Therefore, in this state, the inner diameter of the workpiece can be properly detected by the contact portion. There is an effect that can be.

Here, in the apparatus according to the fourth aspect, a tubular holding member for holding the workpiece is provided, a fork is inserted through the inside of the holding member, and the pressing force is applied to the inner surface of the holding member. Since the member is provided, there is an effect that the pressing member can be attached using the holding member without providing a special member.

Further, in the apparatus according to the fifth aspect, since the guide member is formed in a tubular shape having the inner surface shape over the entire circumference, the holding member provided with the guide member is rotationally driven together with the workpiece. Even if it is done, there is an effect that the fork can be rotationally displaced without inconvenience regardless of the rotational phase of the holding member.

[Brief description of drawings]

FIG. 1 is a sectional side view showing a state in which a fork is in a retracted position in a first embodiment of the present invention.

FIG. 2 is a sectional side view showing a process in which the fork moves forward.

FIG. 3 is a sectional side view showing a process in which the fork moves forward.

FIG. 4 is a cross-sectional side view showing a state in which the contact at the tip of the fork has reached a position where it comes into contact with the inner circumferential surface of the groove.

5 is a cross-sectional view taken along the line AA of FIG.

FIG. 6 is an overall cross-sectional side view of a processing device including the fork.

FIG. 7 is a cross-sectional side view showing a state in which a contact at the tip of a fork has reached a position where it comes into contact with the groove inner peripheral surface in the second embodiment of the present invention.

FIG. 8 is a cross-sectional side view showing an example of a conventional front fork gauge type processing apparatus.

[Explanation of symbols]

 18 Electromagnetic Chuck (Holding Member) 29 Groove 30 Grindstone 32 Fork Gauge Body 34 Fork 40 Telescopic Cylinder (Fork Transfer Means) 44 Pin (Rotating Shaft) 48 Contact (Contact Part) 50 Pressed Protrusion 50 'Pressing Protrusion 52 Guide Member 52 'Guided member W Workpiece

Claims (5)

[Claims] 1. A grindstone which is inserted into a workpiece having a circumferential groove on its inner peripheral surface, and which grinds this inner peripheral surface in a state of being in pressure contact with the inner peripheral surface of the groove, and a rotary wheel in the radial direction of said workpiece. A fork gauge that is movable and has an outwardly biased fork, and a fork gauge that detects the inner diameter of the groove by displacement of the contactor in a state where the contact portion at the tip of the fork is in contact with the inner peripheral surface of the groove. In the processing device for a grooved workpiece, fork transfer means for inserting the fork into the workpiece from the side opposite to the grindstone is provided, and a portion of the fork closer to the fork rotation center than the contact portion is covered. While providing the pressing part,
A position where the contact portion comes into contact with the inner peripheral surface of the groove while avoiding the grindstone and the workpiece by contacting the pressed portion with the insertion of the fork on the outside of the fork and pressing the pressed portion radially inward. The fork is displaced in the radial direction so as to move up to and the pressing portion is provided so as to separate from the pressed portion when the contact portion reaches the position where the contact portion contacts the groove inner peripheral surface. A device for machining grooved workpieces. 2. The machining device for a grooved work piece according to claim 1, wherein the fork is provided with a projection to be pressed outwardly in the radial direction as the pressed portion, and the contact portion is provided as the pressing member. A position where the contact portion contacts the groove inner peripheral surface while having an inner surface shape substantially the same as the trajectory drawn by the pressed protrusion when moving to a position where it contacts the groove inner peripheral surface while avoiding the grindstone and the workpiece. And a guide member having an inner surface shape that is separated from the pressed protrusion when the workpiece reaches the position. 3. The pressing member is provided with a pressing protrusion protruding inward in the radial direction, and the fork is pressed to the position where the contact part contacts the groove inner peripheral surface while avoiding the grindstone. There is provided a guided member having an outer surface shape which is constantly in contact with the pressing projection when moving and an outer surface shape which is separated from the pressing projection when the contact portion reaches a position where the contact portion contacts the groove inner peripheral surface. Characteristic grooved workpiece processing equipment. 4. The machining device for a grooved work piece according to claim 1, further comprising a cylindrical holding member for holding the work piece from a side opposite to a side on which the grindstone is inserted, the inside of the holding member. A processing device for a grooved workpiece, characterized in that the fork transfer means is configured to insert the fork into the workpiece through the through hole, and the pressing member is provided on the inner side surface of the holding member. 5. A machining device for a grooved work piece according to claim 2, wherein the work piece is held from a side opposite to a side where the grindstone is inserted, and is driven to rotate in this holding state. The fork transfer means is configured to insert the fork into the workpiece through the inside of the holding member, the guide member is provided on the inner side surface of the holding member, and the guide member is provided over the entire circumference. A machining device for a grooved workpiece, which is formed in a cylindrical shape having an inner surface shape.