JPH04217442A - Adapter for revolving tool - Google Patents

Abstract

PURPOSE:To make a tool angle adjustable at an optional angle in a wide range, by providing a revolving housing turnably around the turning axial line crossed with the rotating axial line of an input rotating axial part for a stationary housing, and combined freely adjustably at the turning axial line direction and position. CONSTITUTION:A revolving housing 5 is revolved around the turning axial line L2 crossed with the axial line L1 of an input rotation axial part 1 for a stationary housing 4 and positioned at a desired tool angle position. Then, the shank of the specified tool is held on a tool holding means 18, the shank of the revolving tool adapter with the tool is installed to a spindle. In that case, the stationary housing 4 is fixed to a spindle head by an adequate means. As a result, the input rotating axial part 1 becomes freely rotatable for the stationary housing 4 together with the spindle. Thus, the input rotating axial part 1 is rotated, when the spindle installed with the revolving tool adapter is driven with rotation. Therefore, output rotating axial parts 10, 16 are driven with rotation via belt/pulley mechanisms 18, 12, 19.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a swing tool adapter that allows tool angle adjustment.

0002

2. Description of the Related Art In conventional angle heads, the tool angle is fixed, or even if the tool angle is variable, a gear mechanism or a flexible shaft is used as a rotation transmission mechanism.

0003

However, the conventional type using a gear mechanism is long and heavy. Moreover, the maximum rotational speed is about 3000 rpm, which is inappropriate for finishing molds. Furthermore, in the case of a type using a flexible shaft, the tool angle and transmission torque are greatly limited. There has been no suitable rotary tool adapter that can be attached to the main shaft of a normal machine tool, allows the tool angle to be varied over a wide range, and is fast, small, and lightweight.

0004

[Means for Solving the Problems] A swing tool adapter according to the present invention includes a fixed housing that is detachably coupled to a fixed side of a machine tool, and a fixed housing that is rotatably supported by the fixed housing and that is rotated after being projected from the fixed housing. an input rotating shaft portion whose end is a shank that is attached to the main shaft of a machine tool; and an input rotating shaft portion that is rotatable relative to the fixed housing around a rotational axis that intersects with the rotational axis of the input rotational shaft portion; a rotary housing coupled to the rotary housing such that the direction and position thereof can be adjusted; and an output rotary shaft portion rotatably supported by the rotary housing around a rotational axis intersecting the rotational axis, the front end protruding from the rotary housing having a tool attachment means. and a rotation transmission mechanism in which a belt is wound around a pulley attached to each of the input rotation shaft portion and the output rotation shaft portion.

[0005] The connection between the fixed housing and the rotating housing is, for example, a threaded connection around a rotational axis that intersects with the rotational axis of the input rotational shaft, or a threaded connection that intersects with the rotational axis of the input rotational shaft. The fitting may be rotatable around the rotation axis via a stopper whose position in the axial direction is adjustable. If necessary, the belt may be formed into a Möbius strip shape, and a planetary speed increasing mechanism may be interposed on the output rotating shaft.

[0006]

[Operation] In the above-mentioned pivoting tool adapter, the pivoting housing is pivoted with respect to the fixed housing around a pivot axis that intersects with the axis of the input rotating shaft portion to position the tool at a desired angular position. In the case of a screw connection, the distance between the two rotational axes changes as the rotating housing turns, and in the case of a fitting with an adjustable stopper, the distance between the two rotational axes is adjusted as appropriate, so the belt wrapping length can be adjusted. That is, the tension of the belt is kept substantially constant.

[0007] Then, in the above-mentioned turning tool adapter, the tool holding means holds the shank of a predetermined tool;
The shank of the swing tool adapter with the tool attached is attached to the main shaft. At this time, the fixed housing is fixed to the spindle head by appropriate means, and as a result, the input rotating shaft portion becomes rotatable with respect to the fixed housing together with the spindle. Thus, when the main shaft to which the turning tool adapter is attached is driven to rotate, the input rotating shaft portion rotates. Therefore, the output rotating shaft portion is rotationally driven via the belt/pulley mechanism. Then, the predetermined tool held by the tool holding means rotates and performs cutting (grinding) on the workpiece.

[0008] The pivoting housing is appropriately pivoted relative to the fixed housing around a pivot axis that intersects with the rotation axis of the input rotating shaft portion, and is positioned and fixed at a desired pivoting position.
The rotational axis of the tool is set at a desired intersecting angle with the axis of the spindle. Even in such a state, the rotation of the main shaft is reliably transmitted to the tool by the belt/pulley mechanism. Note that if a planetary speed increasing mechanism is inserted in the output rotating shaft, the rotational speed of the tool will be increased compared to the rotational speed of the main spindle, resulting in high-speed cutting (grinding).
Processing is performed.

[0009]

【Example】

Embodiments of the invention will be described with reference to the drawings. Note that the up, down, left, and right directions in the following description are the directions in FIG. 1. In FIGS. 1 and 4, a rotating tool adapter capable of adjusting the tool angle consists of an input rotating shaft part inserted into the main shaft M of a machine tool such as a machining center, a housing part, a rotation transmission mechanism built in the housing part, and a tool. It consists of an output rotation shaft section to which the output shaft is attached.

[0010] The input rotating shaft portion is integrally formed with a rotating shaft portion 1 at the tip, a grooved collar portion 2 at the middle, and a tapered shank 3 at the rear end in a coaxial relationship. The taper shank 3 is provided with a screw hole into which the tension rod of the main shaft M is screwed. The housing portion is composed of a fixed housing 4 that is detachably coupled to a fixed side such as the spindle head M0, and a rotating housing 5 that is attached to the fixed housing 4 so that its rotating position can be adjusted.

The fixed housing 4 has a substantially cylindrical shape with a horizontal axis, and a protruding cylindrical part 6 with a vertical axis is provided at the center of the lower outer circumferential wall.
is formed, and an insertion hole for inserting the rotating shaft portion is opened in the right end wall. The rotating shaft portion 1 is inserted into the fixed housing 4 through the insertion hole, and is rotatably supported by rolling bearings 7, 7 provided at both left and right ends of the fixed housing 4. , the pulley 8 is fixed. The rotating housing 5 is assembled from several parts, but as a whole has a substantially cylindrical shape with a horizontal axis,
A protruding cylindrical portion 9 with a vertical axis is formed on the right side of the upper outer circumferential wall.

In the right hollow part of the rotating housing 5, a rotating shaft 10 is rotatably supported by rolling bearings 11, 11 provided on both left and right sides of the protruding cylindrical part 9. In this case, the pulley 12 is fixed. A planetary roller carrier 14 that holds a planetary roller 13 of a planetary roller speed increasing mechanism is provided at the left end of the rotating shaft 10. In the left hollow part in the swing housing 5, the middle part of the rotating shaft 16 of the output rotating shaft inserted through the insertion hole 23 at the left end of the swing housing 5 is mounted on a rolling bearing 15,
15, and a sun roller 16a of a planetary roller speed increasing mechanism is formed at the right end of the rotating shaft 16.

[0013] Then, the planetary roller 13 and the sun roller 16
A planetary roller speed increasing mechanism is constituted by the mutual engagement between the rotary housing 5 and a fixed bearing ring 17 attached to a central large-diameter hollow portion within the rotating housing 5.

The left end of the rotating shaft 16 is connected to the rotating housing 5.
protrudes from the insertion hole 23 of the appropriate tool holding means 1.
8 is provided. The fixed housing 4 and the rotary housing 5 are coupled by fitting and tightening the protruding cylindrical part 6 and the protruding cylindrical part 9 so that their rotational positions can be freely adjusted. A belt 19 is wound around the pulley 8 of the rotating shaft portion 1 and the pulley 12 of the rotating shaft 10.

Regarding the above-mentioned belt winding, the rotation range is within a positive or negative range (for example, Turning angle 0~9
In a turning range of 0 degrees, in this case, the turning neutral position is the turning angle ±
In the case of a swivel tool adapter (45 degrees), the belt 19 is an endless belt, such as a regular flat belt, a V-belt or a timing belt. And the pulleys 8 and 12 are V
Needless to say, the shape is adapted to each of the belt and timing bell. In addition, the pulleys 8 and 12 are
In order to reduce the wear caused by the contact of the belt end edge with the pulley flange as the turning angle increases, the pulley flange has an R-shaped leading edge and an angle of about 30 degrees outward in the width direction. This has been expanded upon.

The turning neutral position is the axis L of the fixed housing 4.
In the case of a swing tool adapter in which the axis L2 of the swing housing 5 and the axis L2 of the swing housing 5 intersect at a right angle (swivel angle ±90 degrees), the belt 19 is semi-twisted and joined endlessly, forming a so-called Möbius strip. There is.

[0017] In the case of a turning tool adapter whose turning neutral position is a turning angle of +90 degrees and a turning tool adapter whose turning angle is -90 degrees,
The half-twisted sides of the belt are opposite from each other.

The belt 19 may be, for example, a flat belt, a V-belt, a timing belt, etc., but in the case of a V-belt and a timing belt, both the front and back surfaces must be formed into the same shape.

In this way, when the turning angle from the origin of the turning angle of 0 degrees is increased, the distance between the axes of both pulleys, that is, the axis L
If the intersection angle increases while the distance between L2 and axis L2 remains unchanged, the length of the endless belt wound around both pulleys increases, and the tension applied to the endless belt increases.

[0020] Here, a description will be given of the coupling structure between the fixed housing 4 and the rotating housing 5 in which the rotational position can be adjusted, that is, the fitting connection between the protruding cylindrical part 6 and the protruding cylindrical part 9 and the rotational position can be adjusted.

In the first embodiment shown in FIGS. 1 and 2, the outer peripheral surface of the protruding cylindrical portion 6 of the fixed housing 4 is formed with a male thread to form a male threaded portion 61. The inner peripheral surface of the protruding cylindrical portion 9 is engraved with a female thread to form a female thread portion 91 . Then, the fixed housing 4 and the rotating housing 5 are coupled at the respective protruding cylindrical parts 6 and 9 by screwing the male threaded part 61 and the female threaded part 91 (in the illustrated example, the protruding cylindrical part 6 is male and the protruding cylindrical portion 9 is female, but the reverse is also possible).

The thread direction (right-handed thread/left-handed thread) of the male threaded portion 61 and female threaded portion 91 differs depending on the swing angle range of the swing housing 5. The thread direction (right-handed thread/left-handed thread) of the male threaded portion 61/female threaded portion 91 is such that the rotation range of the rotating housing 5 with respect to the fixed housing 4 is the same as that of the fixed housing 4.
The rotation range differs depending on whether the rotation range is positive or negative, with the origin being a position parallel to the axis L1 of the housing 5 and the axis L2 of the rotation housing 5 (where the intersection angle is 0 degrees). That is, the screw direction is such that when the turning angle increases with respect to the origin, the distance between the axis L1 and the axis L2 decreases.

Therefore, as mentioned above, in order to solve the problem of the increase in tension applied to the endless belt due to the rotation, the axis L1 of the fixed housing 4 and the axis L2 of the rotating housing 5 can be solved.
When the protruding cylindrical part 9 of the rotating housing 5 is rotated with respect to the protruding cylindrical part 6 of the fixed housing 4 so that the rotating angle increases from the origin parallel to the origin (the rotating angle is 0 degrees), the above-mentioned Fixed housing according to rotation due to screw connection 4
Since the distance between the axis L1 of the rotary housing 5 and the axis L2 of the rotating housing 5 is reduced, an increase in the length of winding between both pulleys, that is, an increase in the tension applied to the endless belt is suppressed. Conversely, in the case of a turn in which the turning angle decreases from the origin, the endless belt does not loosen unnecessarily.

For this purpose, the male threaded portion 61 and female threaded portion 91 are
The thread pitch is selected such that the winding length between both pulleys does not change as much as possible despite the increase or decrease of the turning angle from the origin.

In order to fix the rotating housing 5 at a predetermined rotating position with respect to the fixed housing 4, a set screw screwed into the protruding cylindrical portion 9 prevents the rotating housing 5 from rotating.

To explain in detail, as shown in FIGS. 2 and 3, an appropriate number of screw holes 20, 20, for example, 3 or 4, are bored in the protruding cylindrical portion 9 at equal intervals on the circumference in the radial direction. First, a brass cylindrical body piece 21 having a thread forming a part of the female thread on the inner circumferential surface of the protruding cylindrical part 9 is inserted into each of the bolts 22, 22. . . . is screwed in, and its tip abuts against the rear end surface of the cylindrical body piece 21.

In the second embodiment shown in FIGS. 4 and 5, the outer circumferential surface of the protruding cylindrical portion 6 of the fixed housing 4 and the inner circumferential surface of the protruding cylindrical portion 9 of the rotating housing 5 are slidably fitted. The protruding cylindrical portion 9 is cut in the axial direction at one point in the circumferential direction to form a slit 92 with an appropriate gap. A thread is carved into the upper end of the outer peripheral surface of the protruding cylindrical portion 9 to form a male threaded portion 93.
The threaded ring 24 is screwed into the male threaded portion 93 . On the outer circumferential surface of the protruding cylindrical portion 9, radial ears 94 and 95 are formed protrudingly below the male threaded portion 93 on both sides of the slit 92. Coaxial holes are drilled in the ears 94 and 95, one of which is a bolt hole 96 and the other hole is a screw hole 97. The tightening bolt 25 inserted into the bolt hole 96 is screwed into the screw hole 97.

Therefore, when the protruding cylindrical part 6 and the protruding cylindrical part 9 are fitted into each other in a rotationally adjustable manner, the end surface of the screw ring 24 screwed to the appropriate protruding position comes into contact with the lower surface of the fixed housing 4. By coming into contact with each other, the relative positions of the protruding cylindrical portion 6 and the protruding cylindrical portion 9 in the axial direction are determined. That is, the distance between the axis L1 of the fixed housing 4 and the axis L2 of the rotating housing 5 is set to a desired size.

Therefore, as mentioned above, in order to solve the problem of the increase in tension applied to the endless belt due to the rotation, the axis L1 of the fixed housing 4 and the axis L2 of the rotating housing 5 can be solved.
Since the distance between the two pulleys can be adjusted to an appropriate size regardless of the rotation angle, there is no need to increase or decrease the wrapping length between the two pulleys, in other words, increase the tension applied to the endless belt or unnecessarily loosen the endless belt. is suppressed.

The operation of the above-mentioned swing tool adapter capable of adjusting the tool angle will be explained. In the turning tool adapter of the first embodiment with a desired turning range, the bolts 22, 22...
When loosened, the thread on the tip surface of the cylindrical body piece 21 becomes loose from the threaded surface of the protruding cylindrical part 6, and the protruding cylindrical part 9 becomes rotatable relative to the protruding cylindrical part 6, so that the rotating housing 5 is fixed to the fixed housing. 4 by the required rotation angle, position the tool at the desired angle, and tighten the bolts 22, 22, . . . . Then, the tips of the bolts 22, 22... are connected to the cylindrical body piece 21.
The cylindrical body piece 21 is pushed in by contacting with the cylindrical body piece 21, and the screw thread on the tip surface of the cylindrical body piece 21 engages with the threaded surface of the protruding cylindrical part 6 and presses it. Therefore, the protruding cylindrical part 9 is fixed to the protruding cylindrical part 6, and the pivoting housing 5 is integrated with the fixed housing 4 at the desired tool angle.

In the second embodiment of the swivel tool adapter having the desired swivel range, when the tightening bolt 25 is loosened, the slit 92 widens and the protruding cylindrical portion 9 becomes rotatable relative to the cylindrical protruding portion 6, so that the swivel can be performed in a desired range. The housing 5 is rotated by a required rotation angle with respect to the fixed housing 4, positioned at a desired tool angle, and the end face of the threaded ring 24 is aligned with the fixed housing 4.
The axis L of the fixed housing 4 allows the proper tension of the endless belt to be obtained by adjusting the rotation while contacting the lower surface of the fixed housing 4.
1 and the axis L2 of the rotating housing 5, and then tighten the tightening bolt 25. Then slit 92
becomes narrower, the protruding cylindrical part 6 is tightened to the protruding cylindrical part 9, the protruding cylindrical part 9 is fixed to the protruding cylindrical part 6, and the pivoting housing 5 is integrated with the fixed housing 4 at a desired tool angle. be converted into

Then, in both embodiments, the shank of a given tool is held by the tool holding means 18, so that the tool is attached to the pivoting tool adapter. As shown in FIG. 6, this swing tool adapter with a tool installed is stored in a tool magazine of a machining center, for example, and is gripped by the annular groove of the grooved flange part 2 by an exchange hand, and is attached to the main axis M of the machining center at a predetermined angle. It is installed depending on the position. The taper shank 3 is inserted into the tapered hole of the main shaft M, the tension rod of the main shaft M is screwed into the screw hole, and the turning tool adapter is fixed to the main shaft M by retracting the taper shank 3.

At this time, the fixed housing 4 is fixed to the spindle head M0 by appropriate means such as a positioning pin P, and as a result, the input rotary shaft portion is rotatable with respect to the fixed housing 4 together with the spindle M. Thus, when the main shaft M equipped with the turning tool adapter is rotationally driven, the rotating shaft portion 1
, and thus the pulley 8 rotates relative to the fixed housing 4. Therefore, the pulley 12 and, by extension, the rotating shaft 10 are rotationally driven via the belt 19. Then, the planetary roller 13 held by the planetary roller carrier 14 moves to the fixed bearing ring 1
It rotates on its own axis while contacting the rotary shaft 10, and also revolves around the axis of the rotating shaft 10.

Then, the sun roller 16a in contact with the planetary roller 13 rotates at a faster speed than the rotation of the rotating shaft 10. That is, the tool whose shank is held by the tool holding means 18 of the rotary shaft 16 rotates at a higher speed than the rotation of the rotary shaft 10 and, in turn, the rotation of the main shaft M, so that the workpiece is cut by the tool rotating at high speed. (grinding) processing is performed. The thrust load on the tool is supported by the main shaft M via the rotating shaft 16, the rolling bearings 15, 15, the housing section, the rolling bearings 7, 7, and the input rotating shaft section.

As described above, the swing housing 5 is positioned and fixed at a desired swing position with respect to the fixed housing 4 around the axes of the protruding cylindrical parts 6 and 9, and the axis of the swing housing 5, that is, the axis L2 of the tool is , set at a desired intersection angle with respect to the axis of the fixed housing 4, that is, the main shaft axis L1,
Even if the rotation housing 5 is set at ±45 degrees from the neutral rotation position, the axis L1 of the fixed housing 4 as described above
Since the distance between the rotation housing 5 and the axis L2 of the rotating housing 5 is adjusted, the tension of the belt 19 is substantially constant, and the rotation of the pulley 8 is reliably transmitted to the pulley 12.

In particular, when the neutral rotation position of the rotation housing 5 is a rotation angle of ±90 degrees, since the belt 19 is in the shape of a Möbius strip, both driving portions are at a rotation angle of 90 degrees at the neutral rotation position.
Since the pulley 8 is twisted, the rotation of the pulley 8 is easily transmitted to the pulley 12. Swivel housing 5 further ±4
Even if the belt is rotated by 5 degrees and positioned, since it is a Möbius strip-shaped belt 19, both orthogonal parts are at 9 degrees at the neutral position of the rotation.
Even if it twists 0 degrees and then turns further in the positive and negative directions, at least one side will be less twisted, so the rotation of the pulley 8 will be more difficult than twisting a normal endless belt to 90±45 degrees. It is reliably transmitted to the pulley 12 without any interference.

Therefore, three types of turning tool adapters are prepared whose neutral turning positions are +90 degrees, 0 degrees, and -90 degrees, and by adjusting them appropriately, the neutral positions of the turning angles can be adjusted to -(90+45) degrees. Swivel tool adapters can be provided that are set to a wide range of tool angles from +(90+45) degrees. A selection program for a turning tool adapter is created in advance and set to an arbitrary turning angle depending on the machining shape of the workpiece, etc., and is selectively used in a machining center or the like.

[0038]

Effects of the Invention The rotating tool adapter capable of adjusting the tool angle of the present invention is small and lightweight, and the tool angle can be adjusted to any angle within a wide range (for example, -(90+45) degrees to +(90+45) degrees). Even if the tool angle changes, the belt tension can be maintained approximately constant in the internal belt transmission,
High speed rotation is possible. This makes it suitable for finishing, for example, molds with complex shapes.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional side view of a turning tool adapter in a first embodiment of the invention.

FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1;

FIG. 3 is a perspective view of a bolt and a cylindrical body piece for fixing the pivoting tool adapter in an embodiment of the present invention.

FIG. 4 is a cross-sectional side view of a fitting joint between protruding cylindrical portions of a swing tool adapter in a second embodiment of the present invention.

FIG. 5 is a sectional view taken along line V-V in FIG. 4;

FIG. 6 is a front view of a turning tool adapter in an embodiment of the invention.

[Explanation of symbols]

1 Rotating shaft part 2. Grooved flange 3 Taper shank 4 Fixed housing 5 Swivel housing 6,9　Protruding cylindrical part 61,93 Male thread part 91 Female thread part 92 slit 94,95 Ear part 96 bolt hole 97,20 Screw hole 7, 11, 15 Rolling bearing 8,12 Pulley 10, 16 Rotation axis 13 Planetary roller 14 Planetary roller carrier 16a Sun roller 17 Fixed bearing ring 18 Tool holding means 19 Belt 21 Cylindrical body piece 22 bolts 23 Insertion hole 25 Tightening bolt 24 Screw ring M0 Spindle head M Main shaft P Positioning pin

Claims (4)

[Claims] 1. A fixed housing that is coupled to a fixed side of a machine tool so as to be able to engage and disengage; a shank that is rotatably supported by the fixed housing and whose rear end protruding from the fixed housing is attached to the main shaft of the machine tool; a rotating housing coupled to the fixed housing so as to be rotatable about a rotational axis intersecting the rotational axis of the input rotational shaft and to be adjustable in position in the direction of the rotational axis; an output rotary shaft portion rotatably supported by the rotary housing around a rotation axis intersecting the rotation axis, and whose front end protruding from the rotary housing is provided with a tool attachment means; an input rotary shaft portion and an output rotary shaft portion; A turning tool adapter consisting of a rotation transmission mechanism in which a belt is wrapped around each pulley attached to each. 2. The swivel tool adapter according to claim 1, wherein the fixed housing and the swivel housing are connected by a threaded surface around a rotation axis intersecting the rotation axis of the input rotation shaft portion. [Claim 3] A patent in which the fixed housing and the rotating housing are rotatably fitted around a rotational axis that intersects with the rotational axis of the input rotational shaft via a stopper whose position is adjustable in the axial direction. Swivel tool adapter according to claim 1 4. The turning tool adapter according to claims 1 to 3, wherein the belt has a Möbius strip shape.