JPH068006A - Lathe machining control device - Google Patents

Abstract

PURPOSE:To improve workability by way of automatically cutting a workpiece while preventing breakage of a cutting tool by softly putting the cutting tool on the workpiece at the time of starting cutting. CONSTITUTION:To a tool rest 5 of a lathe machining machine in which the tool rest 5 installed with a cutter holder 4 reciprocates along the axial direction of a spindle 2 on a bed 1 against a chuck 3 installed on the rotating spindle 2, a cylinder 6 to move it by way of pressing it on the side of the spindle 2 is connected and simultaneously, an oil enclosed damper where a rod 9 contracts while absorbing impact as the rod 9 makes contact with the tool rest 5 before a cutting starting point against the tool rest 5 is provided on it, and a limit switch 25 to reverse a rod 7 of the aforementioned cylinder 6 by way of working at a cutting finishing point against the aforementioned tool rest 5 is provided on it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lathe machining control device for automatically cutting a workpiece to a predetermined size.

[0002]

2. Description of the Related Art Generally, when cutting an end surface of a work such as a press-molded cap with a lathe to remove burrs and finish it to a specified dimension, a person who is not skilled in cutting a cutting tool close to the work Workers often failed to hit the cutting tool against the work piece, resulting in damage to the cutting tool.

[0003]

DISCLOSURE OF THE INVENTION The present invention eliminates the above-mentioned drawbacks and provides a lathe machining control apparatus capable of automatically applying a cutting bite to a workpiece at the start of cutting to prevent damage to the cutting bite while automatically cutting. To do.

[0004]

DISCLOSURE OF THE INVENTION The present invention is directed to a lathe machine in which a tool rest, to which a bite holder is attached, reciprocates on a bed along the axial direction of the main spindle, facing a chuck attached to a rotating main spindle. A cylinder is connected to the tool rest to move it by pressing it toward the spindle, and the rod contracts while absorbing the impact by abutting the tool rest before the cutting start point facing the tool rest and absorbing the impact. An oil-filled damper is provided, and a limit switch that opposes the tool rest and operates at a cutting completion point to restore the rod of the cylinder is provided.

[0005]

In the lathe machining control apparatus of the present invention, when the workpiece is set on the chuck and the start switch is turned on, the rod of the cylinder extends and the tool rest moves on the bed toward the spindle. Before the cutting tool attached to the tool holder hits the work piece and starts cutting, the tool post with the tool holder hits the rod of the oil-filled damper first. When the tool rest collides with the rod of the oil-filled damper, the shock is absorbed here, the speed becomes slow, and the tool slowly moves, and the cutting tool starts cutting while gently hitting the workpiece.

As described above, while the speed is slowly regulated by the oil-filled damper, the cutting tool is pushed by the cylinder and advances toward the main shaft to cut the rotating workpiece. When it is cut to a predetermined size, the stopper attached to the tool rest hits the limit switch, and this contact is actuated to retract the rod of the cylinder to return to the initial state and stop.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to FIGS. A main spindle 2 which is connected to a motor (not shown) and rotates, and a chuck 3 attached thereto are provided on the bed 1, and a tool rest 5 on which a bite holder 4 is attached facing the main spindle 2 is provided on the bed 1. It reciprocates along the axial direction. An air cylinder 6 is attached to the rear of the tool rest 5, and the tip of this rod 7 is connected to the rear part of the tool rest 5. Also, on the side of the main shaft 2,
The oil-filled damper 8 is fixed so as to face the tool rest 5,
The rod 9 is in front of the cutting start point of the workpiece 10 and the turret 5
It comes into contact with.

In the structure of the oil-filled damper 8, for example, as shown in FIG. 3, a rod 9 is inserted into a cylinder 13 so that the rod 9 can be retracted and retracted, and a flange 14 is connected to the lower end of the rod 9. The inside of the cylinder 13 is separated by a partition plate 15, and the partition plate 15 is provided with an orifice 16 and a one-way valve 17. This divider 15
A coil spring 18 is attached between the flange 14 and the flange 14, and the rod 9 is constantly extended by this elastic force. Also, a cap is attached to the lower end of the cylinder 13.
An adjusting pin 20 having a conical tip is threaded at 19 to project from the center of the cap 19, and the tip of the adjusting pin 20 penetrates through the orifice 16 to adjust the width of the gap 21 between them. It is supposed to do. Oil 22 is enclosed in the cylinder 13, and an oil passage 23 is formed inside the wall surface of the cylinder 13 to connect the upper side of the flange 14 and the lower side of the partition plate 15.

Further, as shown in FIG. 1, a stopper 24 formed of a bolt is attached to the lower part of the tool rest 5 so as to be adjustable along the axial direction of the main shaft 2, and is opposed to the stopper 24. A limit switch 25 is fixed to the limit switch 25, and when the contact point of the limit switch 25 collides with the stopper 24 to operate, the rod 7 of the air cylinder 6 is restored. In the figure, 26 is a cutting tool supported by the tool holder 4, and 27 is a chuck lever.

A case will be described in which a burr is removed from the end surface of the cap-shaped workpiece 10 press-molded by the above-mentioned lathe machining control device and the workpiece is cut to a predetermined size. The tip of the rod 9 of the oil-filled damper 8 is set so as to hit the tool rest 5 before the machining start point, and the stroke of the rod 9 is set longer than the cutting amount. Further, the cutting amount is set by twisting a stopper 24 formed by a bolt and adjusting a distance between the cutting and the limit switch 25.

After that, a chuck-shaped workpiece is attached to the chuck 3.
Set 10 and rotate the chuck lever 27 to fix it.
Next, when a start switch (not shown) is turned on, air is supplied to the air cylinder 6, the rod 7 extends, and the tool rest 5 moves on the bed 1 toward the spindle 2 side. Before the cutting tool 24 attached to the tool holder 4 hits the workpiece 10 and starts cutting, the tool rest 5 hits the rod 9 of the oil-filled damper 8 first.

When the rod 9 of the oil-filled damper 8 is pushed by the tool rest 5, the internal oil 22 is squeezed by the orifice 16 of the partition plate 15 while the flange 14 compresses the coil spring 18 as shown in FIG. Oil 22 that has been pushed out and flowed into the cap 19 side passes through the oil passage 23 and the flange 14
Is sent to the upper part of the rod 9 and the rod 9 contracts in the direction of the arrow.
At this time, since the width of the gap 21 between the adjustment pin 20 penetrating the inside of the orifice 16 is adjusted to be narrow, the amount of the oil 22 passing therethrough is regulated and the rod 9 contracts at a constant speed. Go. In other words, when the tool rest 5 pushed by the air cylinder 6 collides with the rod 9 of the oil-filled damper 8, the impact is absorbed here and the speed slows down and moves slowly, so that the cutting tool 26 gently moves onto the workpiece 10. Cutting starts while hitting.

In this way, the cutting tool 26 advances toward the main spindle 2 and the rotating workpiece 10 is cut while the speed is slowly regulated by the oil-filled damper 8. When it is cut to a predetermined size, the stopper 24 attached to the tool rest 5 hits the limit switch 25 to activate this contact, and a changeover switch (not shown) is turned on so that the rod 7 of the air cylinder 6 retracts and returns. To go. At this time, the rod 9 of the oil-filled damper 8 is pushed back by the elastic force of the coil spring 18, the oil 22 above the flange 14 is returned below the partition plate 15 through the oil passage 23, and the one-way valve is further pushed.
It returns through 17 and returns to the initial state and stops.

Therefore, as compared with the conventional method in which the cutting tool 26 is applied to the workpiece 10 to start the cutting, the cutting tool 26 is first processed with the air cylinder 6 as compared with the method in which the operator depends on the intuition. Since it is fed to the position just before the cutting start point of 10 at a high speed, and while reducing the speed by the oil-filled damper 8 to reduce the load at the start of cutting, the cutting tool 26 is slowly applied to the workpiece 10 to start cutting, The cutting tool 26 can be automatically machined to a predetermined size without damage.

In the above embodiment, the case of cutting in one direction along the spindle 2 is shown. However, when the workpiece 10 is also moved in the direction orthogonal to the spindle 2, two-dimensional machining is performed. The air cylinder 6 and the oil-filled damper 8 may be mounted in the direction orthogonal to the main shaft 2. Further, in the above embodiment, the structure in which the tool rest 5 is moved by the air cylinder 6 is shown, but a structure using an oil cylinder may be used. Further, the oil-filled damper is not limited to the structure shown in FIG. 3 and may have another structure as long as the structure allows the rod to move at a constant speed by absorbing an impact.

[0016]

As described above, according to the lathe machining control apparatus according to the present invention, the cutting tool is sent at a high speed to the position just before the cutting start point of the workpiece by the cylinder, and the speed is controlled by the oil-filled damper to perform the cutting. Since the cutting tool is slowly applied to the work piece while starting the cutting while reducing the load at the start, it is possible to automatically machine to the specified dimension without damaging the cutting tool, and even an unskilled worker can accurately machine it. It is possible to improve productivity significantly.

[Brief description of drawings]

FIG. 1 is a side view of a lathe machining control device showing a state before starting cutting according to an embodiment of the present invention.

FIG. 2 is a side view of the lathe machining control device showing the state at the end of cutting in FIG.

FIG. 3 is a cross-sectional view showing the oil-filled damper of FIG.

[Explanation of sign]

 1 Bed 2 Spindle 3 Chuck 4 Bit Holder 5 Turret 6 Air Cylinder 7 Rod 8 Oil Filled Damper 9 Rod 10 Workpiece 13 Cylinder 15 Partition Plate 16 Orifice 18 Coil Spring 20 Adjustment Pin 21 Gap 22 Oil 24 Stopper 25 Limit Switch 26 Cutting Bit 27 Chuck lever

Claims (1)

[Claims] 1. A tool rest of a lathe machine in which a tool rest having a bite holder attached thereto reciprocates on the bed along the axial direction of the spindle, facing the chuck attached to the rotating spindle. A cylinder for moving by pushing to the side is connected, and an oil-sealed damper is provided that allows the rod to abut against the tool post facing the tool post and to abut on the tool post to absorb the impact and cause the rod to contract. A lathe machining control device which is provided with a limit switch which is opposed to the tool rest and operates at a cutting completion point to return the rod of the cylinder.