JPH10151501A - Attachment for lathing eccentric or elliptic shaft - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an attachment which is a simple device and installed in a turret of a compound machining lathe and which enables lathing of eccentric shafts or elliptic shafts. SOLUTION: An attachment 3 for lathcing eccentric shafts or elliptic shafts is installed in a detachable manner in a turret 2 of a tool rest incorporating a revolving tool driving device which can rotate synchronously with a main spindle. In this case, the attachment 3 is constituted to a first cantilever crank shaft 5 having a clutch 6 engaging with a driving device of an attachment main body 4, a second cantilever crank shaft 8 which is rotated at the same speed and in the same direction as those of the crank shaft 5 via gears 7, 10, 9, and a cutting tool mount 11 which supports the shaft of crank pins 5c, 8c which are projected from the front surface of both crank shafts 5, 8. For instance, the crank motion of the cutting tool mount 11 within the surface facing the main spindle is synchronized with the rotation of the main spindle, with its amount of eccentricity R that is equal to the amount of eccentricity R of the eccentric shaft W. Thus, machining to the eccentric shaft is carried out by a cutting tool T, which is in circular motion, accompanying the cutting feed of the tool rest in the direction of the Z-axis.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an eccentric / elliptical shaft attachment used for a lathe.

[0002]

2. Description of the Related Art Conventionally, in order to machine an eccentric shaft with a lathe, a method of turning a work by attaching a work to a chuck or a chuck and a tailstock with the work offset by an eccentric amount is generally used. In order to machine an elliptical axis, it is common to use a special copying lathe and synchronize the rotation of the model with the rotation of the workpiece to perform the turning.

[0003]

In the method of turning an eccentric shaft described in the prior art, the work mounting setup must be changed each time a work having a different eccentric amount is machined, and the time required for the setup replacement is long. As a result, the operating rate becomes worse. In addition, the method of turning elliptical axis machining described in the conventional technology requires a special machine tool, which increases the cost of equipment, and if emphasis is placed on copying accuracy, the rotation of the workpiece cannot be increased, and the cutting conditions are reduced. Therefore, there is a problem that the time required for processing becomes long. SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the related art, and an object of the present invention is to provide a multi-unit capable of synchronously controlling a main shaft and a rotary tool shaft which has recently been generally used. An object of the present invention is to provide a simple and small attachment which is attached to a working lathe to machine an eccentric shaft and an elliptical shaft.

[0004]

In order to achieve the above object, an eccentric / elliptical shaft machining attachment for a lathe according to the present invention is provided.
An attachment to be used by being attached to a turret of a lathe having a built-in rotary drive mechanism capable of rotating synchronously with a spindle on a tool post, wherein the output of the rotary drive mechanism is provided at a rear end of the attachment body so as to be rotatable in parallel with the spindle axis. A clutch that is removably engaged with the shaft clutch;
A first cantilever crankshaft having an eccentric portion projecting to the front; and The first cantilever crankshaft and the second cantilever crankshaft have the same phase as the first eccentric part and the second eccentric part having the same amount of eccentricity projecting to the front, and the two crankpins of the first and second cantilever crankshafts have the same phase. A gear train for transmitting the rotation of the first cantilever crankshaft to the second cantilever crankshaft so as to rotate at the same speed in the same direction, and the first cantilever crankshaft and the second cantilever crankshaft. A blade mounting base that cranks in a plane perpendicular to the main shaft axis of the front surface of the attachment body by the circular motion of the two crank pins by rotating the crank pins. Things.

[0005] An attachment for use by being attached to a turret of a lathe having a built-in rotary drive mechanism capable of rotating synchronously with a spindle on a tool post, wherein the attachment is provided on an attachment body so as to be rotatable in parallel with the axis of the spindle and is provided at a rear end thereof. A first cantilever crankshaft having a clutch detachably engaged with a clutch of an output shaft of the rotation drive mechanism, a first eccentric portion at a front end protruding forward, and the first cantilever crank attached to the attachment body. A second cantilever crankshaft that is rotatably provided at a position parallel to the axis and separated in a cutting direction perpendicular to the axis direction of the main shaft and has a second eccentric portion having the same eccentricity as the first eccentric portion and protruding forward; A blade that performs a crank motion while facing a cutting direction in a plane perpendicular to a main axis of a front surface of the attachment body by a circular motion of two crank pins of the first cantilever crankshaft and the second cantilever crankshaft; It is made of the mount.

The eccentric / elliptical shaft machining attachment according to claim 1 configured as described above is provided by a rotary tool drive mechanism with a built-in tool post on an attachment body detachably attached to a rotary tool mounting station of a turret. Two cantilevered crankshafts to be rotated are provided, and each of the crankpins projecting from the front surface of the two cantilevered crankshafts is rotatably mounted on a turret mounting base, so that a front surface of the tool mounting base attachment body is provided. Circular motion (crank motion) is possible while facing the cutting axis (X-axis) direction in the main shaft opposing surface, and the blade mounting base is cranked in synchronization with the rotation of the work, so that the eccentric axis and the elliptical axis can be moved. Since the turning process is performed, the attachment becomes extremely simple, small, and low in production cost. Without using, it is possible to turning of the eccentric shaft and the ellipse axis only just a simple setup change attaching the attachment to the turret of the composite working lathe currently in use.

[0007] The second aspect of the present invention is a second aspect of the attachment body.
Since the crank motion of the tool mount is performed by driving only one of the cantilever cranks of the book, the attachment becomes simpler, and the eccentric / elliptical shaft machining attachment is lightweight and easy to handle.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION

FIG. 4 is a cross-sectional view of the eccentric / elliptical axis attachment shown in FIG. 1; FIG.
The description will be made based on the explanatory diagram of the elliptical processing. In FIG. 1, reference numeral 1 denotes a spindle chuck of a combined machining lathe, and reference numeral 2 denotes a turret on a known tool rest having a built-in rotary tool drive mechanism capable of rotating synchronously with the spindle, around a turning center axis in a spindle axis (Z-axis) direction. The turning index is provided.

The turret 2 has a plurality of tool mounting stations on the main shaft facing surface 2a, at least one of which is Z
It is formed in a tool mounting station for a rotary tool having an axial through hole 2b. The eccentric / elliptical axis machining attachment 3 of the present invention is detachably attached to the tool mounting station for the rotary tool. The attachment body 4 is a substantially rectangular box having a guide shaft portion 4a inserted into the through hole 2b at a right angle, and a plurality of bolts (not shown) whose longitudinal direction is a cutting axis (X-axis) perpendicular to the main axis. Thus, the turret 2 is detachably fastened to the main shaft facing surface 2a of the turret 2.

A rotating shaft 5A of a first cantilevered crankshaft 5 of an assembling type is rotatably supported by a plurality of bearings on the attachment body 4 concentrically with the guide shaft portion 4a, and the rear end of the rotating shaft 5A is a guide shaft. The driven side clutch 6 protrudes from the portion 4a, the front end protrudes forward from the box body, and the rear side protruding portion is keyed to the passive side clutch 6 which is detachably engaged with the driving side clutch of the rotary tool driving mechanism built in the tool rest. The gear 7 is integrally formed at the position near the front end.

Further, the attachment main body 4 has a plurality of rotary shafts 8A of a second cantilever crankshaft 8 which can be assembled at a position parallel to the first cantilever crankshaft 5 and away from the main shaft axis in the X-axis direction. It is rotatably supported by a bearing. Rotary shaft 8A
Has a front end protruding forward, a rear end provided with a key 9 having the same number of teeth as the gear 7, and an intermediate gear 10 with a shaft at the center of the gear 7 and the gear 9 rotatable by a plurality of bearings. The rotating shaft 5A of the first cantilevered crankshaft 5 and the rotating shaft 8A of the second cantilevered crankshaft 8 rotate at the same speed in the same direction by a rotating tool drive mechanism built in the tool rest. ing.

The crank eccentricity R is provided at the tip of each of the rotating shafts 5A, 8A of the first cantilever crankshaft 5 and the second cantilever crankshaft 8 projecting from the attachment body 4.
One of the through-holes is fitted and fixed via a key (not shown) so that the crank arms 5B and 8B having two through-holes formed at the same interval as the crank arms 5B and 8B have the same phase.

On the other hand, on the tool mount 11, a crankpin 5C of the first cantilever crankshaft 5 and a crankpin 8C of the second cantilever crankshaft 8 are provided.
B and 8B are rotatably supported via bearings at the same intervals in parallel with bearings, and the protruding ends of the crank pins 5C and 8C are inserted into the other through holes of the crank arms 5B and 8B, and a key (not shown) is inserted. A tool mounting groove is formed in the surface of the tool mounting base 11, and an outer diameter turning tool T is detachably mounted in the tool mounting groove.

The eccentric / elliptical shaft machining attachment 3 configured as described above has a first cantilever crank shaft 5 that rotates synchronously with the main shaft, and a second cantilever crank that rotates via gears 7, 10, and 8. The shaft 8 is rotated at a constant speed in the same direction, and the tool mount 11 performs a crank motion by the circular motion of the radius R of the crank pins 5C, 8C on the XY plane, and the cutting tool T attached thereto is rotated. The cutting edge moves in a circular motion.

Next, an example of turning of the eccentric shaft by the eccentric / elliptical shaft machining attachment 3 of the present invention will be described.
As shown in FIG. 1, the workpiece W is gripped by the spindle chuck 1,
The main shaft is rotated at the rotation speed N, and the workpiece W is rotated as shown in FIG.
The first cantilevered crankshaft 5 and the second cantilevered crankshaft 8 having the eccentricity R equal to the eccentricity R are rotated in the same direction at the same rotational speed N as the main shaft, respectively. center S ₂ is positioned so that at a distance in the X-axis direction by the spindle axis S 1/2 equivalent amount X of the diameter D ₁ of the eccentric machining, outer with cutting feed in the Z-axis direction the spindle side of the Doing径旋cutting machining, the cutting edge of the byte T 3 may eccentric shaft eccentricity R, diameter 2 · X for abutting vertically on the outer periphery toward the center S ₃ always eccentric shaft. Since the eccentric amount R of the work coincides with the pitch of the through holes of the crank arms 5B and 8B, it is possible to cope with a plurality of types of works W having different eccentric amounts by replacing the crank arms 5B and 8B.

Next, an example of turning of an elliptical axis will be described with reference to FIG. The first and second cantilever cranks having an eccentric amount R equal to 1/4 of the dimensional difference between the major axis and the minor axis of the elliptical shaft to be machined by rotating the main shaft at a rotational speed N in the same manner as in the above-described machining example of the eccentric shaft. the axis 5,8, are respectively rotated in the same direction at twice the rotational speed of the spindle speed (2N), the ellipse axis center S ₂ of the locus circle of the cutting edge of the byte T is processed from the spindle axis S ₁ short Diameter D3
Is positioned in the X-axis direction at a distance X in the X-axis direction by an amount X corresponding to プ ラ ス of the eccentricity amount R or マ イ ナ ス of the major diameter D2 minus the eccentricity amount R2. By processing, an elliptical axis having a major axis 2 (X + R) and a minor axis 2 (X-R) is formed. The phase of the eccentricity and the phase of the ellipse can be changed by changing the phase between the main shaft and the cantilever crankshaft.

Embodiment 2 The second embodiment will be described with reference to the sectional view of the eccentric / elliptical axis attachment shown in FIG. The second embodiment differs from the first embodiment of the eccentric / elliptical axis attachment in that the rotation of the first cantilever crankshaft 5 is changed to the second.
Gears transmitted to cantilever crankshaft 8 (7, 9, 10 in FIG. 1)
Are the only parts without, and the others are the same.

Therefore, the second cantilever crankshaft 8 of FIG. 5 of the present invention is free to rotate, and maintains the posture so that the blade mount 11 always faces the X-axis direction. It has the advantage that the manufacturing cost is low and the handling is easy, so it is effective when processing with a little accuracy can be satisfied. The attachment according to the present invention is not limited to the one using a drive mechanism for a rotary tool, but may be any drive mechanism that can rotate synchronously with the main shaft. In addition, the two cantilever crankshafts are of an assembling type that can replace the crank arm part, and by preparing a plurality of sets of crank arm parts according to the eccentricity of the work and the dimensional difference between the major axis and minor axis of the ellipse. In addition, the desired eccentric shaft and elliptical shaft can be machined, thereby increasing the utility value.

[0019]

Since the eccentric / elliptical axis attachment of the present invention is constructed as described above, the following effects can be obtained. According to a first aspect of the present invention, an eccentric mounting setup of a workpiece is achieved by simply attaching an attachment having a simple structure in which a blade mounting base is driven by two cantilever crankshafts provided on an attachment body and performing a crank motion to a turret of a combined machining lathe. Eccentric shaft and elliptical shaft can be turned without using a special machine tool or the like, and there is no need to eccentrically chuck the work, minimizing unbalance and enabling stable cutting.

According to the second aspect of the present invention, the blade mounting base is cranked by driving only one of the two cantilever crankshafts. Therefore, the structure becomes simpler, and the attachment becomes lighter and easier to handle. Decrease.

[Brief description of the drawings]

FIG. 1 shows an eccentric shaft during machining of an eccentric shaft according to an embodiment 1 of the present invention;
It is sectional drawing of an elliptical axis processing attachment.

FIG. 2 is an explanatory diagram showing a relationship between a trajectory circle of a cutting edge that performs a crank motion during machining of an eccentric shaft and an eccentric shaft to be machined according to the first embodiment.

FIG. 3 is an explanatory view showing a developed view of a cutting edge of a cutting tool during machining of an eccentric shaft on a machining circumference according to the first embodiment.

FIG. 4 is an explanatory diagram showing a relationship between a trajectory circle of a blade moving in a crank motion during machining of an elliptical axis and an elliptical axis to be machined according to the first embodiment.

FIG. 5 is a cross-sectional view of an eccentric / elliptical shaft machining attachment of Example 2 of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spindle chuck 2 Turret 3 Eccentric / elliptical shaft machining attachment 4 Attachment main body 5 First cantilever crankshaft 7, 9 Gear 8 Second cantilever crankshaft 10 Intermediate gear with shaft 5A, 8A Rotating shaft 5B, 8B Crank arm 5C, 8C Crank pin 11 Blade mount T byte W Work

Claims (2)

[Claims] 1. An attachment used by being attached to a turret of a lathe having a rotary drive mechanism built in a tool post and capable of rotating synchronously with a main shaft, wherein the attachment is provided on the attachment main body so as to be rotatable in parallel with the main shaft axis and at a rear end thereof. A first cantilever crankshaft having a clutch detachably engaged with a clutch of an output shaft of the rotation drive mechanism, a first eccentric portion at a front end protruding forward, and the first cantilever crank attached to the attachment body. A second cantilever crankshaft that is rotatably provided at a position parallel to the axis and separated in a cutting direction perpendicular to the axis direction of the main shaft and has a second eccentric portion having the same eccentricity as the first eccentric portion and protruding forward; ,
The rotation of the first cantilever crankshaft is adjusted so that two crankpins of the first and second cantilever crankshafts rotate in the same direction at the same speed in the same direction. And the two crankpins of the first cantilever crankshaft and the second cantilever crankshaft are rotatably supported, so that the circular motion of the two crankpins causes the front surface of the attachment main body to rotate. An eccentric and elliptical shaft machining attachment for lathes, comprising a tool mount that cranks while facing in a cutting direction in a plane perpendicular to the spindle axis. 2. An attachment which is used by being attached to a turret of a lathe having a built-in rotary driving mechanism capable of rotating synchronously with a spindle on a tool post, wherein the attachment is provided on an attachment main body in a manner rotatable in parallel with a spindle axis and at a rear end thereof. A first cantilever crankshaft having a clutch detachably engaged with a clutch of an output shaft of the rotation drive mechanism, a first eccentric portion at a front end protruding forward, and the first cantilever crank attached to the attachment body. A second cantilever crankshaft that is rotatably provided at a position parallel to the axis and separated in a cutting direction perpendicular to the axis direction of the main shaft and has a second eccentric portion having the same eccentricity as the first eccentric portion and protruding forward; ,
A blade attachment that performs a crank motion while facing a cutting direction in a plane perpendicular to a main axis of the front surface of the attachment body by circular motion of two crank pins of the first cantilever crank shaft and the second cantilever crank shaft. An eccentric and elliptical axis machining attachment for lathes, characterized by comprising a table.