JPH05212671A - Setting structure of grinding wheel - Google Patents

Abstract

PURPOSE:To enable a grinding wheel to be attached to a turning shaft in a highly accurate manner as well as to make the structure simplifiable. CONSTITUTION:A taper shaft part 60 is projected out of an end face 58 of a turning shaft 52 in the axial direction. A grinding wheel 56 is provided with a threadlike grinding surface 65 in the outer circumferential part, while it is formed with a taper hole 66 at the central part, and a runoff part 70 is interconnected to this taper hole 66. A reference plane 74 for positioning this stone 56 to the turning shaft 52 after contacting with the end face 58, is formed in a side face 72a of this grinding wheel 56. In this side face 72a, there is provided a ring groove 76 which turns an opening end round concentrically in space between this opening end and the reference plane 74 of the taper hole 66, and in the other side face 72b of the stone 56, there is provided another ring groove part 78 likewise.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grindstone mounting structure for mounting a grindstone constituting a gear grinding device on a rotary shaft.

[0002]

2. Description of the Related Art For example, a grinding wheel used in a gear grinding machine has a screw-shaped grinding surface formed on its outer peripheral portion and a taper hole provided at its central portion. The taper hole of the grindstone is fitted into the taper shaft portion protruding from the end surface of the rotary shaft that constitutes the spindle unit, whereby the work of mounting the grindstone on the rotary shaft is performed. In this state, the grindstone is driven to rotate integrally with the rotary shaft, so that the outer peripheral portion of the gear material is subjected to gear grinding through the threaded grinding surface of the grindstone.

[0003]

By the way, in order to carry out gear grinding with high accuracy, it is necessary to mount the grindstone and the rotary shaft coaxially and surely. This is because, if an attachment error occurs between the grindstone and the rotary shaft, the wobble of the thread-shaped grinding surface of the grindstone will occur during the rotation of the grindstone.

Therefore, the applicant corrects the position of the grindstone by screwing a plurality of adjusting bolts around the tapered hole of the grindstone and selectively pressing the adjusting bolts against the end surface of the rotary shaft. Proposal of possible equipment (Actual publication 63-
9410).

The present invention has been made to a mounting structure for a grinding wheel of this type, and the grinding wheel can be mounted on a rotary shaft with high accuracy, and in particular, the structure can be simplified. An object of the present invention is to provide a grindstone mounting structure capable of grinding.

[0006]

In order to achieve the above-mentioned object, the present invention has a tapered shaft portion projecting in the axial direction from an end surface of a rotary shaft that is rotationally driven, and a grinding surface provided on an outer peripheral portion thereof. A grinding wheel mounting structure for mounting a grinding wheel having a tapered hole formed in a central portion thereof, wherein the grinding wheel communicates with the tapered hole and forms a gap between the grinding wheel and the tapered shaft portion. On the relief and at least one side,
A groove provided near the opening end of the tapered hole,
A reference surface for contacting an end surface of the rotating shaft and positioning the grinding wheel with respect to the rotating shaft.

[0007]

In the grinding wheel mounting structure of the present invention, the grinding wheel is fixed to the rotary shaft by fitting the taper hole of the grinding wheel into the tapered shaft portion of the rotary shaft. At that time, the grindstone is provided with a groove near the opening end of the tapered hole, and the vicinity of the tapered hole of the grindstone can be elastically deformed via the groove. Therefore, when the grindstone is pushed toward the taper shaft side, the grindstone is elastically deformed so that the taper hole of the grindstone can be fitted into the taper shaft part, and the reference surface of the grindstone is surely brought into contact with the end surface of the rotary shaft. You can Therefore, it is possible to easily position the rotary shaft and the grindstone coaxially and with high precision.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The mounting structure of a grinding wheel according to the present invention will be described in detail below with reference to an embodiment in relation to a gear grinding device incorporating the same.

In FIG. 1, reference numeral 10 indicates a gear grinding device, and a bed 1 which constitutes the gear grinding device 10.
On the upper surface of 2, the cutting table 14 is arranged so as to be movable back and forth in the direction of arrow A. This cutting table 14 is used for the first motor 1
6 is engaged with a ball screw 18 connected to the shaft 6. The traverse table 20 is arranged on the cutting table 14 so as to be movable back and forth in the direction of arrow B.
Is engaged with a ball screw 24 connected to the second motor 22.

A work holding mechanism 26 is provided on the traverse table 20. The work holding mechanism 26 includes a headstock 28 and a tailstock 30, and the headstock 28 is a work W which is a gear material. And a third motor 32 for rotating the. A work sensor 34 is arranged on the traverse table 20 close to the work W.

A column 36 is erected on the bed 12 in front of the cutting table 14 in the traveling direction, and a swivel table 38 is held by the column 36. The turning table 38 is
A fourth motor 40 is rotatable in the direction of arrow C. A fifth motor 42 is fixed to the upper part of the front surface of the swing table 38. A ball screw 44 connected to the fifth motor 42 and extending in the direction of arrow D shifts the shift table. 46 engages.
A grindstone spindle unit 48 is attached to the shift table 46. This grindstone spindle unit 48
Includes a sixth motor 50 for rotating the grindstone.
The rotating shaft 52 is rotationally driven by the motor 50. A grinding stone 56 is attached to the tip of the rotary shaft 52 via a mounting structure 54 according to this embodiment (see FIG. 2).

As shown in FIG. 3, an end face 58 is formed at the tip of the rotary shaft 52, and a taper shaft portion 60 projects axially from the end face 58. The tapered shaft portion 60 has a tapered shape, and has a first screw portion 62a and a second screw portion 62a at the tip thereof.
The screw portion 62b is formed coaxially. The first and second screw portions 62a and 62b have nuts 63a and 63b, respectively.
Screw together to hold the grindstone 56 on the rotary shaft 52.

The grindstone 56 has a substantially ring shape, and is provided with a screw-shaped grinding surface 64 having several grooves formed on its outer peripheral portion. A taper hole 66 is provided at the center of the grindstone 56, and an inner wall surface 68 forming the taper hole 66 is
A relief portion 70 is formed that is cut away in the circumferential direction while leaving both end portions of each predetermined length, and is separated from the tapered shaft portion 60.

On the side surface 72a of the grindstone 56 on the end surface 58 side,
A reference surface 74 for contacting the end surface 58 and for positioning the grindstone 56 with respect to the rotary shaft 52 is formed. The side surface 72a has an opening end of the tapered hole 66 and a reference surface 74.
An annular groove portion 76 that coaxially circulates this opening end between
Is provided. The annular groove portion 76 has a predetermined length in the radial direction and the thickness direction of the grindstone 56 so that the grindstone 56 can be elastically deformed by a necessary amount. An annular groove portion 78 is similarly formed on the other side surface 72b of the grindstone 56.

Next, the operation of the gear grinding apparatus 10 thus constructed will be described in relation to the mounting structure 54 according to this embodiment.

First, with the rotary shaft 52 mounted on the grindstone spindle unit 48, the end surface 58 of the rotary shaft 52 is mounted.
Is corrected. That is, as shown in FIG.
While rotating the rotary shaft 52 under the action of the sixth motor 50, the end surface 58 of the rotary shaft 52 is processed, for example, via the CBN bite 90. At this time, since the rotary shaft 52 is attached to the grindstone spindle unit 48, the end surface 58 can be corrected reliably and highly accurately with respect to the axis of the grindstone spindle unit 48. The CBN tool 90 is used instead of the work holding mechanism 26, or the end surface 58 is machined through a tool holder 92 attached to the work holding mechanism 26.

Next, a grindstone 56 is mounted on the rotary shaft 52. That is, while the tapered shaft portion 60 is fitted in the tapered hole 66 of the grindstone 56, the grindstone 56 is pressed toward the end surface 58 side of the rotary shaft 52. Then, the end surface 5 of the rotating shaft 52
In the state where the reference surface 74 of the grindstone 56 is in contact with 8, the nuts 63a and 63b are screwed into the first and second screw portions 62a and 62b of the taper shaft portion 60, and the grindstone 56 rotates the rotary shaft 52.
Stuck to.

On the other hand, the work W is held by the headstock 28 and the tailstock 30 which constitute the work holding mechanism 26, and the cutting table 14 and the traverse are driven by the first and second motors 16 and 22. The work holding mechanism 26 is displaced to a predetermined position in the arrow A direction and the arrow B direction via the table 20.

On the grindstone 56 side, first, the turning table 38 is turned to a predetermined angle in the direction of arrow C under the driving action of the fourth motor 40, and the grindstone 5 is integrated with the turning table 38.
6 is inclined with respect to the work W at a predetermined angle. And
Shift table 46 provided on turning table 38
Is displaced to a predetermined position via the fifth motor 42.

As a result, the work W and the grindstone 56 are positioned, and after the initial phase of the grindstone 56 and the work W is aligned, the grindstone spindle unit 4 is moved.
The sixth motor 50 of No. 8 and the third motor 32 of the work holding mechanism 26 are synchronously operated. Therefore, the work W is subjected to gear grinding through the threaded grinding surface 64 of the grindstone 56.

In this case, in the mounting structure 54 according to the present embodiment, the relief portion 70 is provided in the tapered hole 66 of the grindstone 56, and both side surfaces 72a and 72b of the grindstone 56 are provided at the opening end portions of the tapered hole 66. Ring grooves 76, 78 in close proximity
Are formed. Therefore, the grindstone 56 has the tapered hole 66.
Since it can be elastically deformed between the open end of the rotary shaft 52 and the annular groove portions 76, 78, the grindstone 5 is attached to the end surface 58 of the rotary shaft 52.
The reference surface 74 of 6 can be reliably contact | abutted. This eliminates the need to use a special position adjustment mechanism,
The effect that the grindstone 56 can be fixed to the rotary shaft 52 with high accuracy and reliability with a simple configuration is obtained.
Particularly, as described above, since the end face 58 is corrected while the rotary shaft 52 is fixed to the grindstone spindle unit 48, the whetstone 56 can be positioned simply by bringing the reference surface 74 into contact with the end face 58. It is carried out with high accuracy.

In the mounting structure 54, the annular grooves 76 and 78 are provided on both side surfaces 72a and 72b of the grindstone 56, but the annular groove 76 may be provided only on one of the side surfaces 72a and 72b, for example. Further, instead of the annular groove portions 76, 78, a plurality of slits extending in the radial direction can be used, and further, the mounting structure 100 as shown in FIG. 4 can be used.

The mounting structure 100 is for fixing the grindstone 102 to the rotary shaft 52, and the reference surface 74 and the annular groove portion 76 are provided on one side surface 104a of the grindstone 102 and the other side surface. The annular groove 1 is provided at 104b.
06 and an annular bulge 108 protruding outward from the end of the annular groove 106. The same components as those of the above-described mounting structure 54 are designated by the same reference numerals, and detailed description thereof will be omitted.

In this mounting structure 100, the vicinity of both opening ends of the tapered hole 66 of the grindstone 102 can be elastically deformed via the annular groove portions 76 and 106 and the annular bulging portion 108. Therefore, by fitting the taper shaft portion 60 of the rotary shaft 52 into the tapered hole 66 of the grindstone 102 and pressing the grindstone 102 toward the end face 58, the reference surface 74 surely comes into contact with the end face 58, and the grindstone The same effect as the mounting structure 54 can be obtained such that the 102 can be positioned with high accuracy.

[0025]

EFFECTS OF THE INVENTION According to the mounting structure for the grinding wheel according to the present invention, the following effects can be obtained.

Since the vicinity of the taper hole of the grindstone can be elastically deformed through the groove portion provided close to the opening end of the taper hole of the grindstone, the reference surface of the grindstone is surely contacted with the end surface of the rotating shaft. Can be contacted. Therefore, it becomes possible to position and fix the grindstone coaxially and highly accurately with respect to the rotation axis with a simple configuration without using a dedicated grindstone position adjusting mechanism or the like.

[Brief description of drawings]

FIG. 1 is an overall perspective view of a gear grinding apparatus that incorporates a grindstone mounting structure of the present invention.

FIG. 2 is a schematic front view of the gear grinding device.

FIG. 3 is a vertical sectional side view of the mounting structure.

FIG. 4 is a vertical cross-sectional explanatory view of another mounting structure of the present invention.

[Explanation of symbols]

 10 ... Gear grinding device 14 ... Cutting table 20 ... Traverse table 26 ... Work holding mechanism 36 ... Column 38 ... Revolving table 46 ... Shift table 48 ... Grinding stone spindle unit 52 ... Rotating shaft 54 ... Mounting structure 56 ... Grinding stone 58 ... End surface 60 ... Tapered shaft portion 64 ... Threaded grinding surface 66 ... Tapered hole 70 ... Relief portion 74 ... Reference surface 76, 78 ... Annular groove portion 100 ... Mounting structure 102 ... Whetstone 106 ... Annular groove portion 108 ... Annular bulging portion

Front Page Continuation (72) Inventor Yoshitaka Imae 1-10-1 Shin-Sayama, Sayama City, Saitama Prefecture Honda Engineering Co., Ltd.

Claims (4)

[Claims] 1. Grinding for mounting a grinding wheel having a grinding surface on the outer peripheral portion and a tapered hole in the central portion on a tapered shaft portion projecting in the axial direction from an end surface of a rotationally driven rotary shaft. A structure for mounting a grinding wheel, wherein the grinding wheel comprises an escape portion communicating with the tapered hole and forming a gap between the tapered shaft portion and an opening end of the tapered hole on at least one side surface. And a reference surface for contacting an end surface of the rotary shaft to position the grindstone with respect to the rotary shaft. 2. The mounting structure according to claim 1, wherein an annular groove portion coaxially circling both opening ends of the tapered hole is provided on both sides of the grindstone for grinding. Construction. 3. The mounting structure according to claim 2, wherein an annular groove is formed on one side surface of the grinding wheel for grinding, and the other side of the tapered hole is formed on the other side surface of the grinding wheel. An attachment structure for a grinding wheel, characterized in that an annular bulge portion is formed around an opening end of the grinding wheel. 4. The mounting structure according to claim 1, wherein the rotary shaft is attached to a spindle unit that constitutes a gear grinding device, and an end surface of the rotary shaft can be modified while being attached to the spindle unit. A grindstone mounting structure characterized by being configured.