JPH0857702A - Non-circular and eccentric work attachment for composite work lathe - Google Patents

Abstract

PURPOSE: To provide an attachment capable of performing non-circular work or eccentric work at high efficiency and high precision without deteriorating functions of a composite work lathe. CONSTITUTION: As a non-circular and eccentric work attachment 10 installed on a rotary tool installation station of a turret tool box of a composite work lathe is indexed to a cutting position, a pawl clutch at an end of a drive shaft inside a tool box main body is engaged with a pawl clutch 19a at an end of a rotary shaft 19 of the attachment 10. Next, the rotary shaft 19 is driven by a servo motor inside the tool box main body which is NC-driven to be capable of controlling rotation position, and a tool box installation base 16 on an X-axis linear guide 20 is moved through a pinion 21 and a rack 18, so X-axis position control of a tool T to a rotation angle of a main spindle is performed by synchronously controlling a main spindle motor and a drive motor for the rotary shaft 19 for performing non-circular or eccentric work.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an attachment to be attached to a turret tool post for performing a non-round shape such as a cam or an eccentric shape such as a crank pin.

[0002]

2. Description of the Related Art In NC lathes, when performing a non-round shape such as a cam or an eccentric shape such as a crank pin, the X-axis position of the turret tool post relative to the spindle rotation angle is specified in the machining program to rotate the spindle and turret tool. The non-round surface or eccentric surface is machined by synchronous control with the X-axis movement of the table. At this time, since the turret tool post reciprocates once for each rotation of the main shaft, it is preferable to drive the turret tool post having the smallest mass with a short ball screw having a small elastic deformation amount.

Therefore, conventionally, as shown in FIG. 3, on a saddle 101 which can be moved and positioned in the Z-axis direction, an intermediate table 102 which can be moved and positioned in the X-axis direction is provided, and on this intermediate table 102, a turret tool post 103 is provided. Has a double slide structure that can be moved and positioned in the X-axis direction. During normal turning, the turret tool post is moved in the X-axis by moving the center table 102 in the X-axis by the first X-axis motor 104. Alternatively, at the time of turning the non-round surface or the eccentric surface of the eccentric work W, the turret tool post 103 is directly moved in the X-axis via the ball screw 106 shorter than the second X-axis motor 105 to perform the turning.

[0004]

The method of moving the turret tool post directly by the second X-axis motor on the center stand of the double slide structure described in the prior art is a conventional turning method when the mass of the turret tool post is reduced. There is a problem that it is not possible to secure the rigidity to withstand the cutting force during processing. Therefore, if a turret tool post with a mass that can be compromised is used, the followability during high-speed reciprocating motion will deteriorate, and
This tends to result in promoting deterioration of the drive mechanism. Further, in the case of the combined machining lathe, since the turret tool post has a built-in drive mechanism for a rotary tool, there is a problem that the mass is further increased and it becomes more difficult to perform high-speed reciprocating motion.

The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to mount a rotary tool mounting position of a turret tool post without impairing the original function of the combined machining lathe. It is intended to provide a non-round and eccentric machining attachment which can machine a non-round or eccentric work at a relatively high speed by simply attaching it to the.

[0006]

In order to achieve the above object, a non-round and eccentric machining attachment of a composite lathe according to the present invention is a turret blade which can be indexed in a plane perpendicular to the main axis of the composite lathe. An attachment body that is detachably attached to the rotary tool attachment position of the table, a blade attachment table that is provided on the attachment body so as to be movable at a right angle to the spindle axis, and the attachment body can be rotated parallel to the spindle axis. A rotary shaft having a pawl clutch that is disengageably engaged with the drive means in the turret tool post when indexed to the cutting position; and a gear member that moves the tool post mount by the rotary shaft. It will be.

The driving means in the turret tool post is common to that for driving the rotary tool.

A means for urging the tool mount in one of the moving directions is provided to eliminate the backlash of the drive system.

[0009]

According to the first aspect of the present invention, when the non-round and eccentric machining attachments attached to the turret tool post of the multi-tasking lathe are indexed to the cutting position, the claw clutch at the drive shaft end in the tool post body and the rotation of this attachment. The X-axis of the tool mount can be moved by the drive shaft servo motor that is fixed to the tool rest body by engaging the pawl clutch at the shaft end, and the tool angle relative to the spindle rotation angle due to the synchronous rotation of the spindle motor and drive shaft servo motor. Non-round or eccentric machining is performed by controlling the X-axis position of the mounting base. During machining, the blade mount moves reciprocally in reverse according to the rotation of the main shaft, but the mass of the blade mount is extremely small, so it has excellent responsiveness even at relatively high speed rotation.

Since the rotary tool drive shaft and the attachment drive shaft are shared, the non-round machining function is added without increasing the weight of the turret tool post of the composite machining lathe and complicating the structure. It becomes possible.

According to the third aspect of the present invention, backlash at the time of reversal due to backlash of the drive system of the blade mount is eliminated to further improve responsiveness, and high-accuracy and high-speed machining becomes possible.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a top view configuration diagram of a combined machining lathe to which a non-round and eccentric machining attachment of the present invention is attached. A saddle 2 is movably mounted on a Z-axis guide 1a provided on the bed 1, and the saddle 2 is moved and positioned by a Z-axis servomotor 3 fixed to the bed 1 via a ball screw (not shown). A center table 4 is movably mounted on an X-axis guide 2a provided on the saddle 2, and the center table 4 is moved and positioned by an X-axis servomotor 5 fixed to the saddle 2 via a ball screw (not shown). .

A turret tool post 6 is fixedly mounted on the center stand 4, and the turret tool post 6 is supported by a tool post body 7 so that a turret 8 can be swivel-indexed in a plane perpendicular to the Z axis. The turret 8 is provided with a plurality of tool mounting stations for fixed tools and rotary tools on the end face on the spindle side at equal intervals, and one of the tool mounting stations includes the non-round and eccentric machining attachment 10 shown in FIG. It is designed to be detachably attached.

Further, the combined machining lathe has a bed for a tailstock (not shown) in parallel with the bed 1, and a headstock 9 is arranged on the left side of the bed so that the tailstock can be moved on the bed. A table 11 is provided. A spindle 12 is rotatably supported by a spindle stock 9. The spindle 12 is driven by a spindle motor (not shown) whose rotational position can be controlled by NC drive, and a chuck 13 is fitted to the tip of the spindle. The tailstock 11 is provided with a tailstock shaft 14 concentric with the main shaft 12 and movable in the Z-axis, and a non-round or eccentric work W chucks the left end of the chuck 13.
And the right end is supported by the tailstock shaft center.

On the attachment body 15 of the non-round and eccentric machining attachment 10, a guide attachment for attaching a shank portion 15a fitted into an attachment hole in the Z-axis direction of the rotary tool attachment station of the turret 8 and a guide in the X-axis direction. A portion 15b is formed, the shank portion 15a has the same shape as the other tool holders, and a V groove 15c that engages with a clamp piece (not shown) of the turret 8 is formed at a right angle to the double shaft. The linear guide 20 is fixed to the guide mounting portion 15b in the X-axis direction, and the tool mount 16 is movably placed on the linear guide. The linear guide 20 may be a ball guide such as a linear guide or a sliding surface guide. A rack 18 is fixed to the tool mount 16 and a bite T is detachably mounted by a clamp bolt 17.

The shank portion 15 of the attachment body 15
A rotary shaft 19 is rotatably supported by a plurality of bearings at a, the rotary shaft 19 has a claw clutch 19a formed at one end, and a pinion 21 at the other end. The pinion 21 is meshed with the rack 18, and the pawl clutch 19a is a servo which is fixed to the tool rest main body 7 and which can control the rotational position of NC drive only when the non-round and eccentric machining attachment 10 is indexed to the cutting position. A claw clutch (not shown) at the end of a drive shaft that is rotated by a motor 22 is disengageably engaged. The servo motor 22 and the drive shaft also serve for driving other rotary tool holders.

Further, at the guide mounting portion 15b of the attachment body 15, a hydraulic cylinder 23 is provided behind the tool mounting base 16.
Is fixed in the same direction as the linear guide 20, the piston 24 is connected to the tool mount 16 by two piston rods 25, and has a stroke equal to or larger than the maximum movement amount of the tool mount 16. The flow path of the pressure oil to the hydraulic cylinder 23 is adapted to be connected to the flow path on the turret tool post 6 side by a joint (not shown) when the attachment 10 having a non-round and eccentric processing is attached to the turret 8. Pressure oil is supplied through the table. The tool mount 16 is constantly urged in one of the moving directions by the hydraulic cylinder 23 to prevent backlash at the time of reversal due to play of the drive system including the rack 18, the pinion 21 and the servo motor 22 as a drive source. It is supposed to avoid it.

The force for urging the tool mounting base 16 may be any thrust as long as it can withstand the cutting reaction force applied to the cutting tool T, and the direction of urging may be on either side of the tool mounting base moving direction. The preferred direction is to pull T back and urge it freely. Further, it is not always necessary to use the hydraulic cylinder 23, and the purpose can be achieved by using a coil spring. Further, it is not always necessary to supply pressure oil to the hydraulic cylinder 23, and it is possible to supply cutting fluid as long as the pressure is sufficient to obtain the required thrust.

Next, the operation of this embodiment will be described. When the non-round and eccentric cutting attachment 10 attached to the turret tool post 8 is indexed to the cutting position, the tool post body 7
Not shown in the drawing is a claw clutch and a claw clutch 19 at the end of the drive shaft.
a is engaged. At the time of engagement, the tool mount 16 is urged in one direction by the piston 24, and the drive shaft (not shown) on the tool post body side is also indexed by the servomotor 22 to a predetermined rotation angle. Engagement will always be the same combination.

Cutting of the non-round or eccentric work W is realized by controlling the position of the cutting edge of the cutting tool T with respect to the rotation angle of the spindle 12 by the synchronous rotation of a spindle motor (not shown) and the servomotor 22. During machining, the blade mount 16 is urged by the piston 24 via the piston rod 25 in a direction in which the blade edge moves backward or forward. Therefore, even if the drive system is loose, it is possible to avoid backlash when the moving direction of the blade mount 16 changes. Further, the reciprocating motion has a very small mass of only the blade mount 16 and the cutting tool T, and high responsiveness can be obtained even at a relatively high speed rotation. In this embodiment, the servo motor 22
An example in which the rotation angle is measured by a detector (not shown) which is fixed concentrically with and the X-axis movement position control of the cutting tool T is performed is shown. The movement of the tool mount 16 is measured by a linear scale and controlled by the servomotor 22. It is also possible to do so.

[0021]

Since the present invention is configured as described above, it has the following effects. According to the first aspect, the non-round and eccentric machining attachments are detachably attached to the turret tool post of the combined machining lathe, and the non-round or eccentric work is turned by the X-axis movement of the tool mount having a small mass. As a result, non-circular or eccentric machining can be performed at a relatively high speed, and machining efficiency and machining accuracy can be improved at the same time.

Since the driving means in the turret tool post is common to that for driving the rotary tool holder, it is possible to mount a normal tool holder by removing the non-round and eccentric machining attachments. The functions of the combined machining lathe can be completely restored.

According to the third aspect of the present invention, the blade mount is biased to eliminate the backlash at the time of reversal due to the backlash of the drive system.
Higher responsiveness can be obtained and processing accuracy can be further improved.

[Brief description of drawings]

FIG. 1 is a top view configuration diagram of a combined machining lathe in which a non-round and eccentric machining attachment according to the present invention is attached to a turret tool post.

FIG. 2 is a configuration diagram of a non-round machining attachment, (a)
Is a top view and (b) is a side view.

FIG. 3 is a diagram showing a non-round machining device for a conventional NC lathe.

[Explanation of symbols]

 6 Turret Turret 7 Turret Main Body 8 Turret 10 Non-round and Eccentric Machining Attachment 15 Attachment Main Body 15a Holder 15b Guide Mount 16 Tool Mount 18 Rack 19 Rotating Shaft 19a Claw Clutch 20 Linear Guide 21 Pinion 22 Servo Motor

Claims (3)

[Claims] 1. An attachment body detachably attached to a rotary tool attachment position of a turret tool post that can be indexed in a plane perpendicular to the spindle axis of a composite lathe, and the attachment body moves at a right angle to the spindle axis. A turret mount that is movably provided and is rotatably provided on the attachment body in parallel with the spindle axis, and engages with the driving means in the turret tool post detachably when indexed to the cutting position. A non-round and eccentric machining attachment for a multi-tasking lathe, which comprises a rotary shaft having a pawl clutch and a gear member that moves the cutter mount by the rotary shaft. 2. A non-round and eccentric machining attachment for a multi-tasking lathe according to claim 1, wherein the driving means in the turret tool post is common to that for driving the rotary tool. 3. A non-round circle of a multi-tasking lathe according to claim 1, wherein means for urging the blade mount in one of the moving directions is provided to eliminate the backlash of the drive system. And eccentric processing attachment.