JPH11235604A - Nc automatic lathe guide bush adjustment device and adjustment method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an NC automatic lathe guide bush adjustment device and an adjustment method thereof which facilitate adjusting a space between a guide bush and a bar with a high accuracy with a simple framework. SOLUTION: This device comprises an adjustment member rotation prevention means 51 to selectively prevent a rotation of an adjustment member 49, a torque detection means to detect spindle motor torque or guide bush torque in rotating a guide bush 31 by a spindle motor on a guide motor while a rotation of the adjustment member 49 is being prevented by the adjustment member rotation prevention means 51, and a control means to control a spin angle thereof on the basis of the detection information by the torque detection means so as to set a space between the guide bush 31 and a bar 25.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a guide bush adjusting device for an NC automatic lathe having a rotary guide bush mechanism and a guide bush adjusting method for an NC automatic lathe.
In particular, the present invention relates to a device devised so that the gap between the guide bush and the bar can be adjusted quickly and with high accuracy with a simple configuration.

[0002]

2. Description of the Related Art In a spindle moving type NC automatic lathe, proper adjustment of a gap between a bar and a guide bush is an important work step for maintaining machining accuracy. Meanwhile, in recent years,
There is an extremely strong demand for a shorter machining time for an automatic lathe, and with the progress of peripheral technologies such as cutting tools and cutting fluids, the speed of spindle rotation has been increased. Also in the guide bush, a rotary guide bush has become the mainstream as compared with a conventional fixed guide bush in order to cope with speeding up of the spindle and prevention of seizure of the work and the guide bush accompanying heavy cutting.

In this type of rotary guide bush,
The adjustment of the gap between the bar and the guide bush has been generally performed as follows. First, the bar is inserted into the guide bush, and the bar is slid in the axial direction or the rotating direction while tightening the adjustment nut. Then, while sensuously checking the resistance between the bar and the guide bush, it is determined whether or not the gap between the bar and the guide bush is appropriate. However, in the case of such an adjusting method, there is a variation in the sense of the worker, and thus, there is a problem that the adjusted gap eventually varies.

For example, Japanese Patent Application Laid-Open No. 7-328804 describes
Japanese Patent Application Laid-Open Publication No. H10-26095 has proposed. The adjusting device disclosed in Japanese Patent Application Laid-Open No. 7-328804 is roughly as follows. First, a bar is inserted into the guide bush, and a screwdriver provided on the spindle cap is engaged with an adjustment nut for adjusting the inner diameter of the guide bush.
Then, the main spindle motor for driving the main spindle is rotated, and when the predetermined torque is reached, the rotation is stopped, thereby adjusting the gap between the guide bush and the bar.

[0005]

According to the above-mentioned conventional configuration, there are the following problems. That is, JP-A-7-32
In the configuration disclosed in Japanese Patent No. 8804, the main shaft and the guide bush are mechanically connected to rotate synchronously. Therefore, in order to rotate the adjustment nut by using the rotation of the main shaft, A connecting means for engaging the adjusting nut (the screwdriver means) and a brake clutch means for preventing the rotation of the main shaft from being transmitted to the guide bush are required, and there has been a problem that the structure is complicated and large. In addition, in readjustment such as bar replacement during the processing of continuous parts, it takes a long time to connect the main shaft and the adjustment nut via the connecting means, thereby reducing production efficiency. There was a problem.

The present invention has been made based on such a point, and an object of the present invention is to adjust a gap between a guide bush and a rod with high accuracy by a simple structure and a simple operation. An object of the present invention is to provide a guide bush adjusting device for an NC automatic lathe and a guide bush adjusting method for an NC automatic lathe.

[0007]

According to a first aspect of the present invention, there is provided a guide bush adjusting device for an NC automatic lathe, comprising: a spindle for gripping a bar; a spindle motor for rotating the spindle; A guide bush that supports the tip of a bar gripped by the spindle and is rotated in synchronization with the spindle by the spindle motor or a guide bush motor arranged separately from the spindle motor, and is screwed to the guide bush. And an adjusting member for moving the guide bush by expanding and reducing the diameter by rotating the guide bush. The guide bush adjustment of the NC automatic lathe for adjusting the gap between the guide bush and the bar is provided. In the device, the rotation of the adjusting member is prohibited by the adjusting member rotation prohibiting means for selectively prohibiting the rotation of the adjusting member, and the adjusting member rotation prohibiting means. When the guide bush is rotated by the spindle motor or the guide bush motor in the state, the torque detection means for detecting the torque of the spindle motor or the guide bush motor, and the spindle motor or the guide bush based on the information detected by the torque detection means. Control means for controlling the rotation angle of the motor to set a gap between the guide bush and the bar. According to the guide bush adjusting device for an NC automatic lathe according to claim 2, in the guide bush adjusting device for an NC automatic lathe according to claim 1, the control means first rotates the guide bush in one direction to remove the rod. Tighten to stop the rotation, and use that as the origin. Then, rotate the guide bush in the other direction by a predetermined amount to form a sufficient gap between the rod and the rod.
It is characterized in that the guide bush is controlled to rotate in one direction by a predetermined amount set based on the diameter to set a gap. The guide bush adjusting method for an NC automatic lathe according to claim 3, further comprising: a spindle for gripping a bar, a spindle motor for rotating the spindle, and a tip end of the bar gripped by the spindle. A guide bush that is rotated in synchronization with the main shaft by a guide bush motor that is arranged separately from the motor or the main shaft motor, and the guide bush is moved by being screwed and rotated with the guide bush to expand and reduce the diameter. And an adjusting member for adjusting the clearance between the guide bush and the bar, wherein the rotation of the adjusting member is inhibited, and the spindle motor or The guide bush is rotated by the guide bush motor, and the torque of the spindle motor or the guide bush motor at that time is detected. It is characterized in that so as to set the clearance between the guide bush and the bar by the rotation angle controlling the spindle motor or the guide bush motor based on the distribution.

That is, in the case of the guide bush adjusting device of the NC automatic lathe according to the present invention, first, the guide bush is rotated by the spindle motor or the guide bush motor in a state where the rotation of the adjusting member is prohibited by the adjusting member rotation prohibiting means. Let it. At that time, the torque of the spindle motor or the guide bush motor is detected by the torque detecting means,
Based on the detected information, the control means controls the rotation angle of the spindle motor or the guide bush motor to set a gap between the guide bush and the bar. In other words, in the past, the gap was adjusted by rotating the adjusting nut for expanding and reducing the diameter of the guide bush, so that the connecting means and the guide bush for transmitting the rotation of the main shaft to the adjusting nut were rotated. Brake / clutch means to prevent this is required, which has become a major factor in the complexity and size of the configuration. On the other hand, in the case of the present invention, if only the adjusting member rotation inhibiting means for inhibiting the rotation of the adjusting member is provided, other configurations are unnecessary, and the configuration is simplified and the simple operation is performed accordingly. This makes it possible to set the gap with high accuracy. Claim 3 defines the above configuration as a method claim.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. First, the overall configuration of an NC automatic lathe will be described with reference to FIG. First, there is a bed 1, on which a headstock 3 is arranged. The headstock 3 is configured to be movable in an axial direction (a direction indicated by an arrow Z in the drawing) by a ball screw / ball nut mechanism (not shown). A spindle 5 is attached to the headstock 3, and the spindle 5 is rotatably attached to the headstock 3 via a bearing member 7. That is, the pulley 9 is fixed to the main shaft 5, while
A pulley is also fixed to the rotating shaft of a spindle motor (not shown). A belt 11 is attached to the pulley 9 and a pulley (not shown).
Is wound. Therefore, by rotating the spindle motor, the spindle 5 can be rotated.

A collet chuck sleeve 13 is arranged on the inner peripheral side of the main shaft 5, and push sleeves 15, 17 are provided on the left side of the collet chuck sleeve 13 in FIG.
Is arranged. Then, the collet chuck sleeve 13 is appropriately moved in the left-right direction in FIG. 1 by the pressing mechanism (not shown) via the pressing sleeves 15 and 17.

On the inner peripheral side of the collet chuck sleeve 13, a collet chuck 19 is accommodated and arranged. A coil spring 21 is stretched between the rear end of the collet chuck 19 and the stepped portion of the collet chuck sleeve 13 so that the collet chuck 19 is constantly urged rightward in FIG. I have. A spindle cap 23 is screwed and fixed to the right end of the spindle 5 in FIG. The tip of the collet chuck 19 (FIG. 1)
The middle right end) is, for example, in a 30% shape and is in contact with the spindle cap 23.

Then, the collet chuck sleeve 13 is appropriately moved to the right in FIG. 1 by the pressing mechanism via the pressing sleeves 15 and 17 against the urging force of the coil spring 21 so that the collet chuck sleeve 13 is moved. The taper surface 13a of the collet chuck 19 and the taper surface 19a of the collet chuck 19 interact to reduce the diameter of the tip of the collet chuck 19, thereby gripping the bar 25. Conversely, the collet chuck sleeve 13 via the pressing sleeves 15 and 17 by the pressing mechanism
1 is released, the urging force of the coil spring 21 causes the collet chuck sleeve 13 to move.
Moves to the left in FIG. 1, and the distal end of the collet chuck 19 expands its diameter by its own spring force, whereby the gripping of the bar 25 is released.

The main shaft 5 and the pulley 9 are connected via a key 27 in the rotational direction. The spindle 5 and the collet chuck sleeve 13 are connected to the pin 2 press-fitted into the spindle 5.
9 and groove 30 formed in collet chuck sleeve 13
Through the collet chuck sleeve 13 within the axial length of the groove 30.
Is allowed to move in the axial direction. Also, reference numeral 3 in FIG.
Reference numerals 2 and 34 denote fixing members used for fixing the bearing member 7 and the like.

On the other hand, a guide bush 31 is disposed in front of the main shaft 5 (right side in FIG. 1). Hereinafter, the mounting structure of the guide bush 31 will be described. The tip of the bar 25 gripped by the main shaft 5 is connected to the guide bush 31.
Will be supported by Guide bush 3 above
The guide bush frame 35 is attached to the bed 1, and a guide bush holder 37 is attached to the guide bush frame 35. A guide bush sleeve 41 is rotatably arranged inside the guide bush holder 37 via a plurality of bearing members 39. The guide bush 31 is accommodated and arranged inside the guide bush sleeve 41 so as to rotate integrally with the guide bush sleeve 41.

A gear 43 is fixed behind the guide bush sleeve 41 (left side in FIG. 1).
It meshes with a separately arranged gear 47. An adjusting nut 4 is provided at the rear (left side in FIG. 1) of the guide bush 31.
9 is screwed and joined, and the gap between the guide bush 31 and the bar 25 can be adjusted by rotating the adjusting nut 49 in an appropriate direction by an appropriate amount. That is, by rotating the adjustment nut 49 in the forward direction, the guide bush 31 is moved to the left in FIG. 1, and the interaction between the tapered surface 31a of the guide bush 31 and the tapered surface 41a of the guide bush sleeve 41 causes the guide bush 31 to move. Reduce the diameter. Thereby, the gap between the guide bush 31 and the bar 25 is reduced. Conversely, by rotating the adjustment nut 49 in the reverse direction, the guide bush 31 is moved to the right in FIG. 1, so that the interaction between the tapered surface 31 a of the guide bush 31 and the tapered surface 41 a of the guide bush sleeve 41 causes
The guide bush 31 is expanded by its own spring force, thereby increasing the gap between the guide bush 31 and the bar 25.

The adjusting nut 49 has a V-shaped groove 49a. On the other hand, a clamp cylinder mechanism 51 is provided. A clamp pin 53 is attached to a piston rod (not shown) of the clamp cylinder mechanism 51. . The adjustment nut 49 is clamped by appropriately driving the clamp cylinder mechanism 51 so that the clamp pin 53 projects and presses the V-groove 49a. Reference numerals 40 and 42 in FIG. 2 denote fixing members used to fix the bearing member 39 and the like.

Next, the structure for rotating the guide bush 31 in synchronization with the main shaft 5 is described.
Is fixed to a ball spline shaft 61, and one end (the right end in FIG. 1) of the ball spline shaft 61 is rotatably supported by the guide bush frame 35 via a bearing member 63. A spline nut 65 is attached to the other end (the left end in FIG. 1) of the ball spline shaft 61, and a gear 67 is fixed to the spline nut 65. The gear 67 is rotatably supported on the headstock 3 via a bearing member 69. On the other hand, the spindle 5
A gear 71 is also fixed to the side, and the gear 71 is in mesh with the gear 67. Therefore, when the main shaft 5 rotates, the gears 71 and 67, the spline nut 6
5. The guide bush 31 rotates synchronously via the ball spline shaft 61, the gear 47, and the gear 43.

The members indicated by reference numerals 44 and 46 in FIG.
This is a fixing member used to fix the bearing member 63 and the like.

A tool post 81 is arranged near the guide bush 31, and a tool 83 is mounted on the tool post 81. The tool rest 81 is configured to be movable in the X-axis direction orthogonal to the Z-axis direction by a ball screw / ball nut mechanism (not shown). FIG. 2 is an enlarged cross-sectional view showing a part of FIG. 1. The state in which the clamp pin 53 is separated from the V-shaped groove 49a is indicated by a solid line, and the state in which the clamp pin 53 is pressed against the V-shaped groove 49a. Is indicated by a virtual line. Also, guide bush sleeve 4
The gear 1 and the gear 43 are connected in the rotational direction via a key 85. In addition, the guide bush sleeve 41 and the guide bush 31 are formed so that the pin 87 press-fitted into the guide bush sleeve 41 is
9 are connected in the rotation direction by being engaged with the groove 9, and are configured to be movable in the axial direction within the axial length of the groove 89.

The operation (adjustment of the gap between the guide bush 31 and the bar 25) based on the above configuration will be described with reference to the flowchart of FIG. First, the bar 25 gripped by the main shaft 5 is inserted into the guide bush 31 with a sufficient gap. Then, the adjustment macro program is started in that state. Next, the clamp cylinder mechanism 51 is driven to cause the clamp pin 53 to protrude and press against the V-groove 49 a of the adjustment nut 49. Thereby, the adjustment nut 49 is clamped (step S1).
Next, the spindle motor is started to rotate the guide bush 31 forward at a low speed (step S2). That is, when the spindle motor starts, the spindle 5 rotates, whereby the guide bush sleeve 41 and the guide bush 31 are synchronized via the gears 71 and 67, the spline nut 65, the ball spline shaft 61, the gear 47 and the gear 43. And rotate.

By the forward rotation of the guide bush 31,
Since the adjustment nut 49 is clamped, the diameter of the guide bush 31 is reduced. The bar 25 is tightened by the diameter reduction of the guide bush 31. The tightening force of the guide bush 31 on the bar 25 is controlled based on the torque of the spindle motor.
That is, it is determined whether or not the torque of the spindle motor has reached a preset torque (step S3). When the set torque is reached, the spindle motor is stopped (step S4). On the other hand, when the set torque is not reached, the spindle motor is continuously rotated.

After stopping the spindle motor, step S5
Then, the rotational position of the spindle motor at that time is set as the origin position. Next, the process proceeds to step S6, in which the spindle motor is rotated in the opposite direction by a predetermined angle (α °) set in advance. Thereby, the gap between the guide bush 31 and the bar 25 is made sufficiently large. Next, the process proceeds to step S7, in which the spindle motor is set to a predetermined angle (β °, β
Rotate forward by <α). The predetermined angle here (β °)
"" Corresponds to the material and diameter of the bar 25. By the above operations, the gap between the guide bush 31 and the bar 25 can be set to a predetermined gap.
Next, the process proceeds to step S8, where the clamp of the adjustment nut 49 is released. That is, the clamp cylinder mechanism 51
Thereby, the clamp pin 53 pressed against the V groove 49a is retracted.

According to the present embodiment, the following effects can be obtained. That is, in the rotary guide bush mechanism, the guide bush 31 is rotated using the spindle motor while the adjustment nut 49 is clamped, and the guide bush 31 and the rod 25 are rotated based on the torque of the spindle motor at that time. The gap between the guide bush 31 and the bar 25 can be adjusted with high precision by a simple operation without requiring a particularly complicated structure. Was. That is, in the related art, the gap is adjusted by rotating the adjustment nut 49 using the rotation of the spindle motor. Therefore, the connecting means (the screwdriver) for engaging the adjustment nut with the spindle motor side is used. Thus, a brake clutch means for preventing the rotation of the spindle motor from being transmitted to the guide bush 31 is required, which has led to a complicated configuration and an increase in the size of the device. On the other hand, in the case of this embodiment, it is only necessary to provide a mechanism for fixing the adjustment nut 49.

Next, a second embodiment of the present invention will be described with reference to FIGS. That is, in the first embodiment, the NC automatic lathe of the type in which the rotation of the spindle motor is transmitted to the guide bush via the mechanical rotation transmission mechanism and is rotated synchronously with the spindle has been described as an example. However, in the case of the second embodiment, an NC automatic lathe of a type in which a guide bush motor is provided separately from the spindle motor and the guide bush is rotated synchronously with the spindle by the guide bush motor will be described. Things.
First, the entire configuration of the NC automatic lathe will be described with reference to FIG. First, there is a bed 101, and this bed 101
The headstock 103 is disposed on the upper side. This headstock 10
Reference numeral 3 is configured to be movable in the axial direction (Z-axis direction) by a servomotor 105, a ball screw 107, and a ball nut 109. The headstock 103 has a spindle 111
The main shaft 111 includes a main shaft motor 112, timing pulleys 114 and 116, and a belt 11.
8, so as to be rotatable.

A guide bush 113 is disposed in front of the main shaft 111 (right side in FIG. 4). Hereinafter, the mounting structure of the guide bush 113 will be described. The tip of the bar 115 held by the main shaft 111 is supported by the guide bush 113. In the configuration near the guide bush 113, first, a guide bush frame 110 is attached to the bed 101, and a guide bush holder 117 is attached to the guide bush frame 110. A guide bush sleeve 121 is rotatably disposed inside the guide bush holder 117 via a plurality of bearing members 119. Guide bush 113
Is housed and arranged inside the guide bush sleeve 121 so as to rotate integrally with the guide bush sleeve 121.

A timing pulley 123 is fixed behind the guide bush sleeve 121 (left side in FIG. 4). On the other hand, a guide bush motor 125 is provided, and a timing pulley 127 is fixed to a rotating shaft of the guide bush motor 125. A belt 129 is wound around the timing pulley 123 and the timing pulley 127. Therefore, when the guide bush motor 125 rotates, the timing pulley 1
The guide bush sleeve 121 and the guide bush 113 rotate through the belts 129 and 27 and 123. An adjusting nut 131 is screwed / joined to the rear part (left side in FIG. 4) of the guide bush 113. By rotating the adjusting nut 131 in an appropriate direction by an appropriate amount, the guide bush 113 and the rod 115 are connected to each other. The gap between them can be adjusted.

The adjusting nut 131 has a V-shaped groove 131a. On the other hand, a clamp cylinder mechanism 133 is provided, and a clamp pin 135 is attached to a piston rod (not shown) of the clamp cylinder mechanism 133. . And, the clamp cylinder mechanism 133
Is appropriately driven to cause the clamp pin 135 to protrude,
The adjustment nut 131 is pressed against the groove 131a.
Is to be clamped.

A tool post 137 is disposed near the guide bush 113, and a tool 139 is attached to the tool post 137. The tool rest 137 is configured to be movable in an X-axis direction orthogonal to the Z-axis direction by a ball screw / ball nut mechanism (not shown).
FIG. 5 is an enlarged cross-sectional view showing a part of FIG. 4, and shows a state where the clamp pin 135 is separated from the V groove 131a by a solid line, and a state where the crank pin 135 is pressed against the V groove 131a. Is indicated by a virtual line. Further, the guide bush sleeve 121 and the tang pulley 123 are connected in the rotational direction via a key 141.
Also, the guide bush sleeve 121 and the guide bush 1
13 is a pin 143 press-fitted in the guide bush sleeve 121 and a groove 1 formed in the guide bush 113.
44, it is connected in the rotation direction and is configured to be movable within the range of the axial length of the groove 144.

The members indicated by reference numerals 120 and 122 in FIG. 5 are fixing members used for fixing the bearing member 119 and the like.

The clearance between the rod 115 and the guide bush 113 is adjusted by rotating the adjustment nut 131 forward.
The guide bush 113 is moved to the left in FIG. 41, and the diameter of the guide bush 113 is reduced by the interaction between the tapered surface 113a of the guide bush 113 and the tapered surface 121a of the guide bush sleeve 121. Thereby, the gap between the guide bush 113 and the bar 115 is reduced. Conversely, by rotating the adjustment nut 131 in the reverse direction, the guide bush 113 is moved rightward in FIG.
3a and the tapered surface 12 of the guide bush sleeve 121
1a, the guide bush 113 is expanded by its own spring force.
The gap between the guide bush 113 and the bar 115 increases.

Based on the above configuration, the operation (guide bush 113 and rod 115
Adjustment of the gap between them). First, the bar 115 held by the main shaft 111 is inserted into the guide bush 113 with a sufficient gap, and the adjustment macro program is started in that state. Then, the clamp cylinder mechanism 133 is driven so that the clamp pin 135 is protruded and pressed against the V groove 131a of the adjustment nut 131,
The adjustment nut 131 is clamped (step S11).
Next, the process proceeds to step S12 to release the synchronous rotation control of the spindle motor 112 and the guide bush motor 125,
Next, the guide bush motor 125 is rotated forward (step S13). As a result, the guide bush 113 also rotates.

At this time, since the adjustment nut 131 is clamped, the guide bush 113 is reduced in diameter and tightens the rod 115. Then, while monitoring the torque of the guide bush motor 125, the guide bush 1
A gap between the rod 13 and the bar 115 is set. That is, the process proceeds to step S14, where it is determined whether or not the torque has reached a preset torque, and when the torque has reached, the guide bush motor 125 is stopped (step S15).
This rotation position is stored as the origin (step S1).
6).

Next, the process proceeds to step S17, in which the guide bush motor 125 is reversely rotated by a predetermined rotation angle (α °) to form a sufficiently large gap between the guide bush 113 and the rod 115. . Next, step S18
Then, the bar 115 is rotated forward by a predetermined rotation angle (β °, β ° <α °) determined by the diameter and the material of the bar 115. Thereby, the guide bush 113 and the rod 115
Can be set. Then, the process proceeds to step S19, in which the clamp cylinder 135 is driven to retract the clamp pin 135, and the adjustment nut 1
The clamped state of 31 is released. Then, step S2
Then, the process proceeds to 0, and synchronous rotation control of the spindle motor 112 and the guide bush motor 125 is started.

Therefore, in the case of the second embodiment, the same effect as in the case of the first embodiment can be obtained.

Next, a third embodiment of the present invention will be described with reference to FIG. In addition, regarding the mechanical configuration, the second
Since this embodiment is the same as that of the first embodiment, the description will be made by using those shown in FIGS. 4 and 5 as they are. Regarding the gap adjustment in the third embodiment, first,
The rod 115 held by the main shaft 111 is moved to the guide bush 1
13 is inserted in a state where there is a sufficient gap, and the adjustment macro program is started in that state. Then, the clamp cylinder mechanism 133 is driven, and the clamp pin 1 is moved.
The adjustment nut 131 is clamped by pressing the adjustment nut 131 into the V groove 131a of the adjustment nut 131 (step S21). Next, the process proceeds to step S22, in which the spindle motor 112 and the guide bush motor 125 are rotated forward by synchronous rotation control. Thereby, the guide bush 1
13 will also rotate.

At this time, since the adjusting nut 131 is clamped, the guide bush 113 is reduced in diameter and tightens the rod 115. Then, while monitoring the torque of the guide bush motor 125, the guide bush 1
A gap between the rod 13 and the bar 115 is set. That is, the process proceeds to step S23, where it is determined whether or not the torque has reached a preset torque, and when the torque has reached, the spindle motor 112 and the guide bush motor 125 are stopped (step S24). Then, the process proceeds to step S25 to cancel the phase shift between the spindle motor 112 and the guide bush motor 125, and stores the rotation position as the origin (step S26).

Next, the process proceeds to step S27, in which the main shaft motor 112 and the guide bush motor 125 are reversely rotated by a predetermined rotation angle (α °), and
And a sufficiently large gap is formed between the rod member 115. Next, the process proceeds to step S28, where a predetermined rotation angle (β °, β ° <α) determined by the diameter and material of the rod 115 is used.
°) only the spindle motor 112 and the guide bush motor 12
5 is rotated forward. Thereby, the guide bush 11
3 and the gap between the bar 115 can be set.
Thereafter, the process proceeds to step S29, in which the clamp cylinder 135 is driven to retract the clamp pin 135, and the clamp state of the adjustment nut 131 is released.

Therefore, also in the case of the third embodiment, the same effects as in the case of the second embodiment can be obtained.

The present invention is not limited to the first to third embodiments. For example, in each of the above-described embodiments, when setting the gap, the bar is tightened by the guide bush, then the diameter is greatly expanded, and then the diameter is reduced by a predetermined amount. It is possible to prevent a decrease in accuracy due to this. However, the present invention is not limited to this. For example, after the rod is tightened by the guide bush, the predetermined gap may be set by expanding the diameter by a predetermined amount without greatly expanding the diameter. .

[0040]

As described above in detail, according to the guide bush adjusting device for the NC automatic lathe and the guide bush adjusting method for the NC automatic lathe according to the present invention, the rotation of the adjusting member is inhibited by the adjusting member rotation inhibiting means. The guide bush is rotated by the spindle motor or the guide bush motor, the torque of the spindle motor or the guide bush motor is detected by the torque detecting means, and the rotation angle of the spindle motor or the guide bush motor is controlled by the control means based on the detected information. Since the gap between the guide bush and the bar is set, it is possible to set the gap with high accuracy by a simple configuration and a simple operation.

[Brief description of the drawings]

FIG. 1 is a view showing a first embodiment of the present invention, and is a front view showing a configuration of an NC automatic lathe with a part cut away.

FIG. 2 is a diagram showing the first embodiment of the present invention, and is a cross-sectional view showing a part of FIG. 1 in an enlarged manner.

FIG. 3 is a view showing the first embodiment of the present invention, and is a flowchart showing an operation of adjusting a gap between a guide bush and a bar in the order of steps.

FIG. 4 is a view showing a second embodiment of the present invention, and is a front view showing a configuration of an NC automatic lathe with a part cut away.

FIG. 5 is a diagram showing a second embodiment of the present invention, and is a cross-sectional view showing a part of FIG. 4 in an enlarged manner.

FIG. 6 is a view showing a second embodiment of the present invention, and is a flowchart showing an operation of adjusting a gap between a guide bush and a bar in the order of steps.

FIG. 7 is a view showing a third embodiment of the present invention, and is a flowchart showing an operation of adjusting a gap between a guide bush and a bar in the order of steps.

[Explanation of symbols]

 5 Main shaft 31 Guide bush 43 Gear 47 Gear 49 Adjustment nut 51 Clamp cylinder mechanism 53 Clamp pin 61 Ball spline shaft 65 Spline nut 67 Gear 71 Gear 125 Guide bush motor

Claims (3)

[Claims] A spindle for gripping a bar; a spindle motor for rotating the spindle; and a guide supporting the tip of the bar gripped by the spindle and being disposed separately from the spindle motor or the spindle motor. A guide bush that is rotated in synchronization with the main shaft by a bush motor; and an adjusting member that moves the guide bush by being screwed and rotated with the guide bush to increase and decrease the diameter.
An NC automatic lathe comprising: a guide bush adjusting device for an NC automatic lathe that adjusts a gap between the guide bush and a bar; an adjusting member rotation inhibiting unit that selectively inhibits rotation of the adjusting member; When the guide bush is rotated by the spindle motor or the guide bush motor in a state where rotation of the adjustment member is prohibited by the adjustment member rotation prohibiting means, torque detecting means for detecting a torque of the spindle motor or the guide bush motor; By controlling the rotation angle of the spindle motor or the guide bush motor based on the detection information by the detection means,
A guide bush adjusting device for an NC automatic lathe, comprising: control means for setting a gap between a guide bush and a bar. 2. The guide bush adjusting device for an NC automatic lathe according to claim 1, wherein the control means first rotates the guide bush in one direction, tightens the bar, stops the rotation, and uses the bar as the origin. Then, the guide bush is rotated in the other direction by a predetermined amount to form a sufficient gap with the bar, and then the guide bush is moved in one direction by a predetermined amount set based on the material and diameter of the bar. A guide bush adjusting device for an NC automatic lathe, wherein the guide bush adjusting device controls the guide bush so as to set a gap by rotating the guide bush. 3. A spindle for gripping a bar, a spindle motor for rotating the spindle, and a tip supporting the tip of the bar gripped by the spindle, and a guide disposed separately from the spindle motor or the spindle motor. A guide bush that is rotated in synchronization with the main shaft by a bush motor; and an adjusting member that moves the guide bush by being screwed and rotated with the guide bush to increase and decrease the diameter.
A guide bush adjusting method for an NC automatic lathe that adjusts a gap between the guide bush and the bar, wherein rotation of the adjusting member is prohibited, and the guide is driven by the spindle motor or the guide bush motor. The bush is rotated, the torque of the spindle motor or the guide bush motor at that time is detected, and the rotation angle of the spindle motor or the guide bush motor is controlled based on the detection information to set a gap between the guide bush and the bar. A method for adjusting a guide bush of an NC automatic lathe, characterized in that: