JPH1158103A - Cutting-off by automatic lathe and lathe itself - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of cutting-off in an automatic lathe and the lathe itself, which allows a spindle stock to retreat to its machining-starting- point during the cutting-off work without complicating the structure and enlarging the unit, thereby shortening the non-cutting time and enhancing in its turn the machining efficiency. SOLUTION: The machining to the front side of a bar-like raw material 5 is carried out while the raw material 5 is gripped on the spindle stock side and the tip end part of the raw material 5 is supported by a guide bush 9. At the completion of the machining on the front side, the tip end part of the bar-like raw material 5 is gripped by the back spindle stock side 17, and cutting- off work is carried out, while rotating the material 5. At the same time, with respect to the spindle stock side, gripping of the bar-like raw material 5 is released so that the spindle stock retreats to the starting point of the machining, preparing for the subsequent machining.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for parting off an automatic lathe having a back spindle and a movable spindle, and more particularly to an automatic lathe. The gripping of the rod-shaped material by the spindle of the above is released, the retreat operation of the headstock to the processing start point is enabled, thereby shortening the non-cutting time and thereby improving the processing efficiency .

[0002]

2. Description of the Related Art A headstock moving type automatic lathe has, for example, the following configuration. First, there is a spindle that grips and rotates a rod-shaped material, and this spindle is rotatably attached to a headstock. The headstock is configured to be movable in the axial direction (Z-axis direction) of the rod-shaped material. A guide bush is arranged in front of the headstock. A tool post is disposed near the guide bush. The tool post is configured to be movable in the X-axis direction orthogonal to the Z-axis direction and has a cutting tool.

[0003] The bar-shaped material is gripped by the spindle and the tip of the bar-shaped material is supported by a guide bush. In this state, for example, the headstock moves in the Z-axis direction and the tool rest moves in the X-axis direction. While performing the cutting, the rod-shaped material is cut by a cutting tool attached to the tool post.

[0004] When a predetermined cutting operation is completed, a parting-off operation is performed. At the time of the parting-off process, the rod-shaped material is naturally held and rotated by the main shaft. Then, after the parting-off process is completed, the grip of the bar-shaped material by the spindle is released, and the headstock is retracted so as to be separated from the guide bush. After the headstock retreats and returns to the machining start point, the bar-shaped material is again gripped by the spindle. Then, the next cutting process is started. Hereinafter, the same cycle is repeated.

There is a configuration in which a back-side spindle is provided for the above-mentioned spindle-moving type automatic lathe. In this case, the front-side processed workpiece cut off by the parting-off process can be gripped by the rear main spindle, and the rear side of the workpiece can be processed by a cutting tool attached to the tool rest.

[0006] The parting-off operation in the spindle-moving automatic lathe having the back spindle is performed as follows. That is, at the time when the front-side cutting is completed, the front end of the rod-shaped material is gripped by the back spindle. That is, the bar-shaped material is gripped from both sides by the main shaft and the back main shaft.
At that time, the rotary drive is performed by the main shaft and the back main shaft. In this state, the bar-shaped material is parted off by a parting tool (parting tool) attached by moving the tool post.

After the parting-off process is completed, the headstock releases the gripping of the rod-shaped material and retreats to the machining start point so as to be separated from the guide bush. After retreating, the bar-shaped material is gripped again to perform the next front side processing. On the other hand, the cut-off work is gripped by the back spindle, and then the back surface is subjected to back processing.

In the above structure, the headstock must be located at a position close to the guide bush and grip the rod-shaped material until the parting-off operation is completed. Can be moved backwards. However, in that case, there is a problem that a long time is required until the next front-side machining is started, and the non-cutting time is lengthened and the machining efficiency is reduced.

In order to solve such a problem, for example, Japanese Patent No. 2566570 has been proposed. The configuration will be described with reference to FIG.

FIG. 14 is a sectional view showing the structure of a part of an automatic lathe according to Japanese Patent No. 2566570. First, there is a headstock 201, and the headstock 201 rotatably holds a spindle 202. A tool rest support 203 is provided in front of the headstock 201. Tool post support 2
A guide bush housing 205 is fixed to 03. A bearing 207 is provided on the inner peripheral side of the guide bush housing 205, and a rotary shaft 209 is rotatably supported via the bearing 207. A timing pulley 211 is fixed to the rotating shaft 209, and a timing belt 213 is wound between the timing pulley 211 and another timing pulley (not shown).

[0011] Therefore, by rotating the another timing pulley by a drive motor (not shown),
The rotation shaft 209 can be driven to rotate via the timing belt 213 and the timing pulley 211.

A guide bush 215 is arranged inside the rotary shaft 209.
An adjusting screw 217 is screwed and joined to the rear end of the screw. A lever 221 is attached to the rear end of the rotation shaft 209 via a pin 219. One end of the lever 221 is in contact with the flange 217 a of the adjusting screw 217, and the other end is projected and arranged on the outer peripheral surface of the rotating shaft 209.

A bobbin 223 is slidably mounted on the outer peripheral surface of the rear end of the rotary shaft 209. The other end of the lever 221 described above abuts against the tapered surface 223a on the inner peripheral side of the bobbin 223. In contact. The bobbin 223 is held by an open / close lever 225 that is swingably attached to the tool rest support 203. Open / close lever 22
Reference numeral 5 is connected to a piston rod 229 of a hydraulic cylinder mechanism 227 attached to the tool rest support 203.

According to the above configuration, for example, by driving the piston rod 229 of the hydraulic cylinder mechanism 227 in the protruding direction, the opening / closing lever 225 rotates counterclockwise, whereby the bobbin 223 moves rightward in the drawing. Moving. As a result, the adjusting screw 2
17 and the guide bush 215 move to the left in the figure. As a result, an appropriate gap is formed between the guide bush 215 and the rod-shaped material 231.

Conversely, by driving the piston rod 229 of the hydraulic cylinder mechanism 227 in the retracting direction, the opening / closing lever 225 is rotated clockwise, whereby the bobbin 223 is moved leftward in the figure. As a result, the adjustment screw 217 and the guide bush 2
15 moves rightward in the figure.

In the automatic lathe having such a configuration, consider a case in which parting off is performed on the bar-shaped material 231. In this case, the guide bush 215 causes the rod-shaped material 23 to be cut off.
1 and is driven to rotate. In this state, the bar-shaped material 231 may be cut off by the cutting blade 233 indicated by a virtual line in the drawing. At that time, the headstock 201
On the side, the gripping of the bar-shaped material 231 can be released, so that it is possible to retreat to the machining start point, thereby shortening the non-cutting time and improving the machining efficiency.

[0017]

According to the above-mentioned conventional configuration, there are the following problems. First, as shown in FIG. 14, there is a problem that the configuration of the guide bush mechanism including the configuration of the guide bush 215 and its vicinity is complicated and large. This is because a rotation drive mechanism is provided in the guide bush mechanism, and a clamp mechanism for causing the guide bush 215 to function as a collet chuck is required. Another problem is that during parting-off, parting-off with two-dimensional processing such as circular arc or taper cannot be performed. This is because the rod-shaped material 231 cannot be moved in the Z-axis direction because the rod-shaped material 231 is gripped by the guide bush 215. Further, in the case of the configuration shown in FIG. 14, the guide bush 215 and the rod-shaped material 2
The gap with 31 is changed during the machining cycle. That is, during normal processing, the guide bush 215
A gap is provided between the rod-shaped material 231 and the rod-shaped material 231.
1 is to be gripped. However, when such a configuration is adopted, it becomes difficult to manage the gap of the guide bush 215, and for example, a situation occurs in which an appropriate gap cannot be formed during normal processing. There is a problem that the processing accuracy is reduced.

The present invention has been made on the basis of such a point, and an object of the present invention is to cause the headstock to retreat to the machining start point at the time of parting off without inducing a complicated structure and an increase in the size of the apparatus. An object of the present invention is to provide an automatic lathe parting-off method and an automatic lathe, which make it possible to shorten non-cutting time and thereby improve machining efficiency.

[0019]

According to a first aspect of the present invention, there is provided a method for parting off an automatic lathe.
The front end of the rod-shaped material is gripped by the spindle held rotatably on the headstock, and front-end processing is performed by the front-side machining tool while the front end of the rod-shaped material is supported by the guide bush. It is gripped by the back spindle that is rotatably held on the back headstock, and cuts off with a parting tool while rotating it, and at the same time, on the headstock side, releases the gripping of the bar-shaped material to the machining start point. It is characterized by retreating and preparing for the next processing. According to a second aspect of the present invention, there is provided an automatic lathe parting-off method according to the first aspect, wherein the headstock side retreats to a processing start point, grips the rod-shaped material again with the spindle, and performs the next processing. Is provided. According to a third aspect of the present invention, in the automatic lathe parting method according to the second aspect, when the parting operation is performed by the parting tool, the parting operation is performed at the time when the parting is performed to a preset intermediate point. It is characterized in that it is determined whether or not the spindle of the headstock grips the rod-shaped material, and when the spindle is gripping the rod-shaped material, the parting-off process after the intermediate point is continued. . The automatic lathe parting method according to a fourth aspect of the present invention is the automatic lathe parting method according to the first aspect, wherein the rod-shaped material gripped by the spindle on the headstock side is cut first. It is characterized in that the direction is set. According to a fifth aspect of the present invention, there is provided an automatic lathe parting method in which, when the parting is performed by the parting tool, the rear headstock side is moved in the axial direction of the spindle when the parting is performed by the parting tool. Thus, in combination with the movement control of the parting-off tool in a direction orthogonal to the direction of the spindle axis, parting-off is performed while performing two-dimensional processing. According to a sixth aspect of the present invention, there is provided an automatic lathe parting-off method according to the fifth aspect, wherein when the parting-off operation is performed up to a preset intermediate point, the spindle on the headstock side that has retreated. Determines whether or not the spindle has gripped the bar-shaped material, and if it is determined that the spindle has gripped the bar-shaped material, the axial operation of the rear headstock and the axial operation of the headstock are synchronized to perform parting-off. It is characterized in that it is continued. The automatic lathe according to claim 7 of the present invention, a headstock movable in the axial direction of the main axis (Z ₁ axial direction) while rotatably holding the main shaft, disposed opposite to the headstock sub spindle a rear headstock possible even with the sub spindle movement is rotated synchronously with the spindle in the axial direction of said back spindle with rotatably hold (Z ₂ axial direction), and between said spindle and said sub spindle The arranged guide bush, and a direction (X ₁ axis direction, or a direction orthogonal to the axis direction (Z ₁ axis direction) of the main shaft arranged on the side of the guide bush,
X) (a _two- axis direction) and a tool rest provided with at least a parting-off tool, and a rod-shaped material gripped by the main spindle is subjected to front-side processing, and after the front-side processing is completed, a front end of the rod-shaped material is gripped by the back-side main spindle. Then, when performing parting-off processing by the parting-off tool in that state, release the grip of the rod-shaped material by the spindle and retreat the headstock to the machining start point,
It is determined whether or not the spindle on the headstock side that has moved backward has gripped the rod-shaped material at the time of cutting off to the preset intermediate point by the parting-off tool, and when it is determined that the spindle is gripping the rod-shaped material, And control means for continuing the parting-off operation after the intermediate point. or,
Automatic lathe according to claim 8, in the automatic lathe according to claim 7, wherein the control means, when carrying out parting processing by the parting tool, movement control to the rear headstock in Z ₂ direction, the tool rest X
The combination of the movement control of the _one axial direction or the X ₂ axis direction is characterized in that in which to perform the parting process while applying a two-dimensional processing. In the automatic lathe according to the ninth aspect, in the automatic lathe according to the eighth aspect, when the parting-off process is performed to a preset intermediate point, the spindle on the headstock side that has retreated moves to a bar-shaped material. determine grasped whether, when the main shaft is determined to holding the rod-like material, a by synchronizing parting processed Z ₂ axial movement and headstock of Z ₁ axial movement of the back attachment It is characterized by being continued.

That is, in the case of performing a parting-off process on the bar-shaped material after the front-side machining, the bar-shaped material is gripped on the rear headstock side and driven to rotate, and in this state, the bar-shaped material is cut off. Apply. On the other hand, on the headstock side, while performing the parting-off processing, the grip of the rod-shaped material is released, and the headstock retracts to the processing start point to prepare for the next processing. Therefore, the next machining can be started immediately after the parting-off process is completed, whereby the non-cutting time can be reduced and the machining efficiency can be improved without any complicated configuration. Further, if the bar-shaped material is grasped again when the bar is retracted, the next processing can be started more quickly. Also, if the direction of the parting tool is set so that the bar-shaped material side gripped by the spindle is cut first, the parting-off process for removing the tabs can be performed again by the rod-shaped material using the spindle on the headstock side. Can be performed without waiting again. Also, by controlling the movement of the rear headstock in the axial direction during parting-off, it is possible to perform parting-off while performing two-dimensional machining by combining this with the movement control of the parting-off tool in the direction perpendicular to the spindle axis direction. For example, it becomes possible to perform parting-off processing also as back processing.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a diagram showing a schematic configuration of a spindle-sliding type automatic lathe according to the present embodiment. The headstock 1 is by a servomotor and a ball screw, a ball nut mechanism, not shown, and is movable in the axial direction (Z ₁ axial direction). The headstock 1 holds the spindle 3 rotatably. The spindle 3 has a collet chuck 7 for gripping the bar-shaped material 5.

In front of the headstock 1 (right side in FIG. 1),
A guide bush 9 is arranged. A first tool rest 11 is arranged on the side of the guide bush 9 (upper side in FIG. 1). The first tool rest 11, by a servomotor and a ball screw, a ball nut mechanism, not shown, and is movable in the X ₁ axis direction orthogonal to the Z ₁ axial direction. A turret 13 is mounted on the first turret 11 so as to be indexable, and a plurality of tools such as a front processing tool 15 and a parting-off tool 15 ′ are attached to the turret 13.

On the opposite side of the guide bush 9 from the headstock 1, a rear headstock 17 is arranged. The back attachment 17, by the servo motor and a ball screw, a ball nut mechanism, not shown, and is configured to be movable in parallel to Z ₂ axial direction Z ₁ axial direction. A back spindle 19 is rotatably held on the back spindle head 17, and a collet chuck 21 for gripping the rod-shaped material 5 is attached to the back spindle 19.

[0024] Also, on the side of the back attachment 17, the second tool rest 23 which is movable by a servomotor and a ball screw, a ball nut mechanism (not shown) to the X ₂ axis direction orthogonal to the Z ₂ axial direction Are located. A turret 24 is also mounted on the second tool rest 23, and a plurality of back surface processing tools 26 are attached to the turret 24.

As shown in FIG. 6, X ₁ axis, Z ₁ axis,
X ₂ axis, Z ₂ axes are controlled to move by a program command of the two systems. Normally, X
_The front side machining is performed by controlling the movement of _one axis and _one Z axis. Further, the program instructions of the second system, performs a back machining by moving control X ₂ axis and Z ₂ axes. In addition, a movement command between arbitrary axes between systems may be exchanged, and as shown in FIG.
It is also possible to exchange commands for the ₁ axis and the X ₂ axis. Note that reference numeral 25 in FIG. 1 indicates control means.

The operation will be described based on the above configuration. First, as shown in FIG. 1, the bar-shaped material 5 is gripped by the collet chuck 7 of the main shaft 3, and the distal end of the bar-shaped material 5 is supported by the guide bush 9. Further, the turret 13 is rotated to determine a predetermined front processing tool 15.
Then, for example, the first tool rest 11 in programmed for the first system is moved the control in the X ₁ axis direction, the headstock 1
While the moving control in Z ₁ axial direction, the front working tool 15
Predetermined processing (so-called front side processing) on the bar-shaped material 5
Is applied.

When the front side machining is completed, the process proceeds to parting off. In this case, as shown in FIG. 2, first, the back spindle head 1 holding the back spindle 19 that is driven to rotate in synchronization with the spindle 3 electrically by a second system program command.
7 is controlled to move Z ₂ axial direction, the collet chuck 21 of the back spindle 19 to grip the leading end portion of the rod-like elements 5 is a front machining end portion which projects from the guide bushing 9. Next, the turret 13 is rotated to determine a predetermined tool (so-called parting tool) 15 '. FIG. 2 shows exactly that state.

[0028] Then, as shown in FIG. 3, the control of the X ₁ axis is switched from the first system controller to a second system control, the program instructions of the second system, moving the first tool rest 11 in the X ₁ axis direction By controlling, the bar-shaped material 5 is cut off by the cut-off tool 15 ′. At the same time, the gripping of the bar-shaped material 5 by the collet chuck 7 of the spindle 3 is released by the first system program command.

Even when the gripping of the bar-shaped material 5 by the collet chuck 7 of the spindle 3 is released, the bar-shaped material 5 is not
Since it is held by the collet chuck 21 of 9 and is driven to rotate, there is no hindrance to the projection processing.

Next, headstock 1 is moved in the _{Z 1} axial direction,
Move back to the machining start point. This is shown in FIG. After retreating to the processing start point, the bar-shaped material 5 is gripped again by the collet chuck 7 of the spindle 3. This is shown in FIG. The main shaft 3 and the rear main shaft 19 are configured to be rotationally driven in synchronization with each other electrically, so that there is no problem even if they are gripped again.

After the parting-off is completed,
Headstock 1 is not retracted to the machining start point, the collet chuck 7 of the spindle 3, since gripping the rod-like elements 5, replacing the movement control of the X ₁ axis in the first system control from the second system control, The front side machining is started as it is in accordance with the first system program command. Meanwhile, the back attachment 17 side provided on the back side machining of the Z ₂ axial direction backward movement control to, then the second tool rest 23 which is performed by a program command of the second system.

The above operation will be summarized with reference to the flowcharts shown in FIGS. First, the first type shown in FIG.
Looking at the system program, the front side machining is performed in step S1, then the process proceeds to step S2, and the front side machining ends. Next, the process proceeds to step S3, where the parting-off tool 1
5 'is selected, and then the process proceeds to step S4, where it is determined whether or not the collet chuck 21 of the back spindle 19 has gripped the bar-shaped material 5. If so, the process proceeds to step S5. Then, the collet chuck 7 of the spindle 3 is opened.

Next, the process proceeds to step S6, where the headstock 1
Is retracted to the machining start point, and thereafter, the collet chuck 7 of the spindle 3 is closed and the bar-shaped material 5 is gripped again (step S7). Then, the process proceeds to step S8, X ₁ axis is possible to determine whether or not the first system control.

On the other hand, looking at the second system program shown in FIG. 9, first, in step S9, it is determined whether or not the front side machining has been completed, and if it has been completed, the process proceeds to step S10. Then, the back spindle 19 is rotated synchronously with the spindle 3. Regarding that the front side machining has been completed,
A signal is output from the first system control side. Then control proceeds to step S11, back attachment 17 toward the picking position for gripping the front end portion of the rod-like elements 5 advances along the Z ₂ axial direction. A signal indicating that the rod-shaped material 5 is gripped by the back spindle 19 is output to the first system control side.

Next, the process proceeds to step S13, switches the _{X 1} axis command from the first system controller to a second system control. Next, the process proceeds to step S14 to perform parting off. Then, the process proceeds to step S15, switches the X ₁ axis command to the first system control from the second system control. The signal is also output to the first system control side. Next, the process proceeds to step S16, in which the rear headstock 17 is retracted to the rear processing position, and
After the back surface processing is performed by the movement control with the tool rest 23, the product is discharged (step S17).

Here, the operation at the time of parting-off processing will be supplemented. First, parting processing by sending the tool rest 11 in the X ₁ axis direction, but will be subjected to parting processing in a rod shape material 5, this time, by the tip of the orientation of the parting tool 15 ', remaining in the main shaft 3 side A portion called “tabo” remains at the center of the end surface of the bar-shaped material 5 or at the center of the end surface of the bar-shaped material 5 gripped on the back spindle 19 side. In the normal case,
The direction of the parting-off tool 15 ′ is determined so that the “tab” remains at the center of the end surface of the rod-shaped material 5 on the main spindle 3 side, and the remaining “tab” is cut by further feeding the parting-off tool 15 ′. I am trying to do it.

At this time, while the driving torque of the back spindle 19 is being transmitted to the bar 5 on the side of the spindle 3, the collet chuck 7 of the spindle 3 of the headstock 1 retreated to the machining start point causes the rod 5 to move. It is necessary to apply a driving rotational force to the rod-shaped material 5 on the main shaft 3 side before the parting-off operation of the front-side processed component is completed by gripping again. However, depending on the relationship between the cut-off time and the retraction / holding time of the spindle 3, it is expected that the cut-off time is too short to continuously apply the driving torque to the rod-shaped material 5 on the spindle 3 side. Therefore, in this case, the cutting-off operation is interrupted until the collet chuck 7 of the spindle 3 of the headstock 1 which has retreated grips the bar-shaped material 5 again, and the collet chuck 7 of the spindle 3 of the headstock 1 again holds the bar-shaped material 5. After the gripping, the remaining parting-off operation is continued to control so as to cut off the “dough”.

The above operation will be summarized with reference to the flowchart of FIG. First, in step S21, parting-off processing is started, and as shown in step S22, whether or not the collet chuck 7 of the spindle 3 is closed before the parting-off processing reaches a preset position (intermediate point).
That is, it is determined whether or not the bar-shaped material 5 is gripped by the collet chuck 7 of the main shaft 3. The set position defined here means a position set within a range in which the bar-shaped material 5 can be driven to rotate by the collet chuck 7 of the main shaft 3.

When the bar-shaped material 5 is not gripped by the collet chuck 7 of the retreated main shaft 3, the process shifts to step S23 to stop the parting off at the set position and wait. When the bar-shaped material 5 is gripped by the collet chuck 7 of the retreated main shaft 3, step S24 is performed.
And the parting-off process is continued to the end position. The terminating position defined here is a position at which no dowel remains on each cut-off surface of the rod-shaped material 5 gripped by the main shaft 3 and the back main shaft 19.

Of course, by the time the collet chuck 7 of the spindle 3 of the retreated headstock 1 grips the bar-shaped material 5 again, the initial stage of the cutting-off operation has not been completed and it has not reached the previously set position. In the obvious case, the above control is unnecessary.

As another method, it is conceivable to set the direction of the parting-off tool 15 ′ so that a “dowel” remains on the end face of the rod-shaped material 5 gripped on the back spindle 19 side. On the back spindle 19 side, the rod-shaped material 5 is always the back spindle 19
Since the parting operation can be completed while being held by the collet chuck 21 and receiving the drive transmission rotation, the above-described interruption is unnecessary.

According to the present embodiment, the following effects can be obtained. First, non-cutting time can be greatly reduced and machining efficiency can be improved without requiring any complicated configuration as in the related art. This means that, during parting off, the bar-shaped material 5 is gripped by the collet chuck 21 of the back spindle 19 and is driven to rotate, while the collet chuck 7 on the spindle 3 side is opened and the headstock 1 is retracted to the machining start point. This is because the rod-shaped material 5 is gripped at the processing start point. That is, while the headstock 1 has been conventionally retracted to the machining start point after the parting-off process has been completed, the retreating operation is performed during the parting-off process.

Also, unlike the conventional configuration, the desired effect can be obtained with an extremely simple configuration without increasing the size of the guide bush mechanism or complicating the configuration.

Next, a second embodiment of the present invention will be described with reference to FIGS. That is, the first
In the embodiment of the present invention, the case where the rod-shaped material 5 is cut off straight by the cut-off tool 15 ′ has been described as an example. However, for example, as shown in FIG. It may be applied.

In this case, as in the case of the first embodiment, at the time of parting off, the headstock 1 is opened with the collet chuck 7 opened by the first system program command.
_It is moving backward in _one axis direction. On the other hand, since holding the rod-like elements 5 by the collet chuck 21 of the back spindle 19, the control of X ₁ axis replacement from the first system controller to a second system control, the first tool rest in programmed of the second system 11 X ₁ axial movement control and back attachment 1
The movement control of the Z ₂ axial direction 7 will make a parting processing with a two-dimensional processing as shown.

Based on the above configuration, the operation will be confirmed with reference to the flowchart of FIG. First, the first
On the system program side, in step S31,
It is determined whether or not the parting-off process has been performed to a preset position (intermediate point). If so, the process proceeds to step S32 where the bar-shaped material is gripped by the collet chuck 7 of the main shaft 3. .

On the other hand, on the second system program side,
In step S33, the parting-off process is started, and in step S34, the parting-off process is performed up to a preset position (intermediate point). Next, the process proceeds to step S35,
It is determined whether or not the bar-shaped material 5 is gripped by the collet chuck 7 of the main shaft 3. If it is gripped, the process proceeds to step S36, in conjunction with synchronizing the Z ₁ axis Z ₂ axes, the process proceeds to step S37, and continues the parting process.

The present invention is not limited to the first and second embodiments. First, the configuration of the automatic lathe is shown by way of example only, and can be similarly applied to an automatic lathe having other configurations. or,
In each of the above embodiments, a parting-off tool is mounted on the first tool post, and parting-off processing is performed by the parting-off tool.
A parting-off tool may be mounted on the second turret, and parting-off processing may be performed by the parting-off tool. In this case, X
Switching of system control of _one axis is unnecessary.

[0049]

As described above in detail, according to the automatic lathe parting method and the automatic lathe according to the present invention, the non-cutting time can be reduced and the processing efficiency can be improved without requiring any complicated structure. This means that, when performing a parting-off process on the bar-shaped material after the front-side processing, the bar-shaped material is gripped on the rear headstock side and rotated so that the bar-shaped material is cut off in that state, On the headstock side, during the parting-off process, the bar-shaped material was released from gripping and retracted to the machining start point to prepare for the next machining. ,
This is because the next processing can be started immediately. Further, if the bar-shaped material is grasped again when the bar is retracted, the next processing can be started more quickly. Also, if the direction of the parting tool is set so that the bar-shaped material side gripped by the spindle is cut first, the parting-off process for removing the tabs can be performed again by the rod-shaped material using the spindle on the headstock side. Can be performed without waiting again. Also, by controlling the movement of the rear headstock in the axial direction during parting-off, it is possible to perform parting-off while performing two-dimensional machining by combining this with the movement control of the parting-off tool in the direction perpendicular to the spindle axis direction. For example, it becomes possible to perform parting-off processing also as back processing.

[Brief description of the drawings]

FIG. 1 is a view showing a first embodiment of the present invention, and is a plan view schematically showing an entire configuration of an automatic lathe.

FIG. 2 is a view showing the first embodiment of the present invention, and is a partial plan view of an automatic lathe for explaining an operation when performing parting off.

FIG. 3 is a view showing the first embodiment of the present invention, and is a partial plan view of an automatic lathe for explaining an operation when performing parting off.

FIG. 4 is a view showing the first embodiment of the present invention, and is a partial plan view of an automatic lathe for explaining an operation when performing parting off.

FIG. 5 is a view showing the first embodiment of the present invention, and is a partial plan view of an automatic lathe for explaining an operation when performing parting off.

FIG. 6 is a diagram showing the first embodiment of the present invention, and is a diagram showing a control system.

FIG. 7 is a diagram showing the first embodiment of the present invention, and is a diagram showing a control system.

FIG. 8 is a diagram showing the first embodiment of the present invention, and is a flowchart showing the contents of the first system control.

FIG. 9 is a diagram showing the first embodiment of the invention, and is a flowchart showing the contents of the second system control.

FIG. 10 is a diagram showing the first embodiment of the present invention, and is a flowchart showing control contents.

FIG. 11 is a view showing a second embodiment of the present invention, and is a partial plan view of an automatic lathe for explaining an operation when performing a parting-off process.

FIG. 12 is a view showing a second embodiment of the present invention, and is a flowchart showing control contents.

FIG. 13 is a view showing a second embodiment of the present invention, and is a flowchart showing control contents.

FIG. 14 is a view showing a conventional example, and is a cross-sectional view showing a partial configuration of an automatic lathe.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 headstock 3 spindle 5 bar-shaped material 7 collet chuck 9 guide bush 11 first turret 13 turret 15 front processing tool 15 ′ parting-off tool 17 back spindle 19 back spindle 21 collet chuck 23 second turret 24 turret 25 control means 26 Back processing tool

Claims (9)

[Claims] A bar-shaped material is gripped by a spindle rotatably held by a headstock, and front-side processing is performed by a front-side processing tool in a state in which a tip end of the bar-shaped material is supported by a guide bush. The front end of the material is gripped by the back spindle that is rotatably held by the back headstock, and the part is cut off by a parting tool while rotating this, and at the same time, the grip of the rod-shaped material is released on the headstock side. A parting method for an automatic lathe, wherein the parting machine is retracted to a machining start point to prepare for the next machining. 2. The automatic lathe parting method according to claim 1, wherein the headstock retreats to a processing start point, grips the rod-shaped material again with the spindle, and prepares for the next processing. Parting method. 3. A parting method for an automatic lathe according to claim 2, wherein, when performing parting-off with a parting-off tool, the spindle of the headstock that has retreated at the point of time when the parting-off is performed to a preset intermediate point grips the rod-shaped material. Determining whether or not cutting has been performed, and if the main spindle is gripping a bar-shaped material, cutting off the intermediate point and thereafter is continued. 4. A parting-off method for an automatic lathe according to claim 1, wherein the direction of the parting-off tool is set so that the rod-shaped material gripped by the spindle on the headstock side is cut off first. A feature of the automatic lathe parting method. 5. The parting method for an automatic lathe according to claim 1, wherein when the parting-off operation is performed by the parting-off tool, the rear spindle head is controlled to move in the direction of the axis of the main spindle, so that the spindle axis of the parting-off tool is controlled. A parting-off method for an automatic lathe, wherein parting-off processing is performed while performing two-dimensional processing in combination with movement control in a direction perpendicular to the direction. 6. A parting-off method for an automatic lathe according to claim 5, wherein when the parting-off operation is performed up to a preset intermediate point, whether or not the spindle on the headstock side that has retreated has gripped the rod-shaped material. When it is determined that the spindle has gripped the rod-shaped material, the axial operation of the rear headstock and the axial operation of the headstock are synchronized so that parting-off processing is continued. Automatic lathe parting method. 7. A headstock movable in the axial direction of the main axis (Z ₁ axial direction) while rotatably holding the main shaft, said while rotatably holding the back spindle disposed to face the headstock a rear headstock said sub spindle rotates synchronized with said main spindle is movable in the axial direction of the back spindle (Z ₂ axial direction), a guide bush which is arranged between said spindle and said sub spindle, the A tool rest which is arranged on the side of the guide bush and is movable in a direction (X ₁ axis direction or X ₂ axis direction) orthogonal to the axis direction of the main shaft (Z ₁ axis direction) and has at least a parting-off tool; Applying front side processing to the rod-shaped material gripped by the main spindle,
After the front side machining, the tip of the rod-shaped material is gripped by the back spindle, and when the parting-off process is performed by the parting-off tool in this state, the gripping of the rod-shaped material by the spindle is released and the headstock is retracted to the machining start point. Operate, determine whether the spindle on the headstock side that has retreated has gripped the rod-shaped material at the time of cutting off to the intermediate point set in advance by the parting tool,
An automatic lathe characterized by comprising: control means for continuing a parting-off operation after the intermediate point when it is determined that the spindle holds a rod-shaped material. 8. The automatic lathe according to claim 7, wherein the control means, when carrying out parting processing by the parting tool, the back attachment and movement control in the Z ₂ direction, the tool rest X ₁ axial or X ₂ An automatic lathe in which parting-off is performed while performing two-dimensional processing in combination with movement control in the axial direction. 9. The automatic lathe according to claim 8, wherein the control means determines whether or not the spindle on the headstock side that has moved backward has gripped the rod-shaped material at the time of performing the parting-off processing to a preset intermediate point. determine, when the main shaft is determined to holding the rod-like material is intended to continue the parting processing by synchronizing the Z ₂ axial movement and headstock of Z ₁ axial movement of the back attachment An automatic lathe characterized by the following.