JPH11347801A - Lathe and turning working method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To work the entire product with high accuracy and at a low cost by a simple and small construction without requiring an attachment. SOLUTION: A bar stock R is supplied to a first chuck 4 by a feeder 1 to stop by a stopper built in the chuck 4, for holding by a claw 16. The bar stock R is cut by the cutting tool 9 of a first tool post 6 in a required length, and the protruding part of a cut piece W is cut by the turning tool 10 of the first tool post 6. The cut piece W is then released from the first chuck 4 to extrude to the side of a second chuck 5 through the trough hole of a main spindle 3 by the bar stock R, for stopping by the stopper 12 of a second tool post 7. The cut piece is then held by the claw 20 of the second chuck 5, and its protruding part is cut by the turning tool 11 of the second tool post 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lathe for processing a relatively small product by using a long bar as a raw material, and a method of turning with the lathe.

[0002]

2. Description of the Related Art As a method for turning small products of this kind,
Conventionally, the following techniques are known. (1) The feeder feeds the bar from the back of the lathe to the chuck at the front end of the spindle, grips the bar with the chuck, rotates with the spindle, and turns the tip of the bar with the turning tool on the tool post. Technology for cutting bar from bar. (2) A technique in which a bar is cut in advance by a dedicated cutting device, and the cut piece is supplied to a lathe by a supply device such as a robot or a loader for processing. (3) A technique in which, when it is necessary to process the entire product, after processing a part of the material, the product is reversed by a dedicated reversing device, gripped again by the chuck, and the remaining part of the material is processed. (4) Similarly, when processing the entire product, using a facing spindle lathe, the material is gripped by the chuck of one spindle, and after processing a part of the material, the product is delivered to the chuck of the other spindle and the rest of the product is processed. Technology to process the part.

[0003]

However, the conventional processing method has the following problems. (1) Since the bar rotates together with the main shaft, whirling of the bar generates vibration on the entire main shaft, which adversely affects machining accuracy. (2) A dedicated cutting device and feeding device are required, and the lathe is complicated and large. (3) A dedicated reversing device is required, and the lathe is complicated and large. (4) Since an expensive opposing spindle lathe is used, the processing cost is high.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a lathe and a lathe turning method capable of processing the whole product with high accuracy and at low cost with a simple and small configuration which does not require any accessory device.

[0005]

In order to solve the above-mentioned problems, a lathe according to the present invention comprises a feeder for supplying a bar, a main shaft having a through hole through which the bar can be inserted, and a main shaft rotatable. , A first chuck for gripping a bar at one end of the spindle close to the feeder, a cutting tool for cutting the bar gripped by the first chuck, and a turning tool for turning a cut piece. A turret, a second chuck for gripping a cut piece pushed out through a through hole of the main shaft by a bar at the other end of the main shaft far from the feeder, and a turning tool for turning the cut piece gripped by the second chuck; And a second tool rest (claim 1).

Here, in order to determine the gripping position of the bar by the first chuck, the first chuck is provided with a stopper for positioning the bar in the axial direction of the spindle.
Further, in order to determine the gripping position of the cut piece by the second chuck, the second tool rest is provided with a stopper for positioning the cut piece in the axial direction of the spindle.

In the turning method according to the present invention, in the above-mentioned lathe, a bar is supplied to a first chuck by a feeder, and the first chuck is supplied to the first chuck.
The tip of the bar is gripped by the chuck, the bar is cut to a required length by a cutting tool of the first tool post, and the protruding portion of the cut piece is moved to the first position.
Turning with the turning tool of the tool post, releasing the cut piece from the first chuck, and cutting the cut piece through the through hole in the
The cutting piece is extruded toward the chuck, the cut piece is gripped by the second chuck, and the protruding portion of the cut piece is turned by a turning tool of the second tool post (claim 4).

[0008]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the lathe of this embodiment includes a feeder 1 for supplying a bar R, and a feeder 1.
, A spindle 3 rotatably supported by the spindle 2, a first chuck 4 attached to a rear end of the spindle 3, and a second chuck attached to a front end of the spindle 3. A chuck 5 and a first turret 6 installed behind the headstock 2
And a second tool rest 7 installed in front of the headstock 2.

The feeder 1 is equipped with a mechanism (not shown) for moving the bar R forward and backward on the axis of the main shaft. The first tool post 6 and the second tool post 7 are installed so as to be movable in the Z-axis and X-axis directions. The turret 6a of the first tool rest 6 has a cutting tool 9 for cutting the bar R held by the first chuck 4.
And a turning tool 10 for turning the cut piece W of the bar R. A turning tool 11 for turning the cut piece W held by the second chuck 7 and a stopper 12 for positioning the cut piece W in the main axis direction are attached to the turret 7 a of the second tool rest 7.

As shown in FIG. 2, the main shaft 3 is formed with a through hole 14 through which the rod R can be inserted. First chuck 4
Is configured to open and close the claws 16 with the pressure of the air supplied from the rotary joint 15 and to grip the bar R at the rear end of the main shaft 3 close to the feeder 1. The first chuck 4 has a built-in stopper 17 for positioning the bar R in the axial direction of the main shaft movably in the chuck radial direction by the pressure of the air supplied from the rotary joint 15. Further, the second chuck 5 is configured to open and close the claw 20 via the draw pipe 19 by the piston 18 and to hold the cut piece W at the front end of the main shaft 3 far from the feeder 1.

Next, a turning method using the lathe configured as described above will be described. First, as shown in FIG. 2, the bar R is supplied to the first chuck 4 by the feeder 1, and is stopped at a fixed position in the axial direction of the spindle by the stopper 17. Hold. Then
As shown in FIG. 3, the stopper 17 is retracted, the first tool rest 6 is moved in the Z-axis and X-axis directions, and the bar R is cut to a required length by the cutting tool 9 and shown in FIG. Thus, the protruding portion of the cut piece W is turned by the turning tool 10 of the first tool post 6.

Subsequently, as shown in FIG. 5, the claw 16 of the first chuck 4 is opened to release the cut piece W, the bar R is advanced by the feeder 1, and the cut piece W is moved to the main shaft 3 at the tip. It is extruded toward the second chuck 5 through the through hole 14 and is stopped at a fixed position in the main shaft axis direction by the stopper 12 of the second tool rest 7. Then, as shown in FIG. 6, the cut piece W is gripped by the claw 20 of the second chuck 5, the second tool rest 7 is moved in the Z axis and the X axis, and the turning tool 11 projects the cut piece W. Turning.

According to this turning method, since the short cut piece W cut from the bar R is rotated and machined together with the main shaft 3, large vibration does not occur in the main shaft 3 and the whole cut piece W is high in height. It can be processed with high precision. Further, since the bar R is cut by the cutting tool 9 of the first tool post 6 and the cut piece W is supplied from the first chuck 4 to the second chuck 5 using the bar R, a dedicated cutting device No device or reversing device is required, the lathe can be configured simply and compactly, and the processing cost of the product can be reduced.

In the lathe according to the above embodiment, the two tool rests 6 and 7 are movable in the Z-axis direction, but the headstock 2 may be provided so as to be movable in the Z-axis direction. Further, as shown by a chain line in FIG. 1, two first tool rests 6 and two second tool rests 7 may be installed at positions sandwiching the spindle axis. Others
The present invention is not limited to the above-described embodiment, and may be implemented by appropriately changing the shape and configuration of each part without departing from the spirit of the present invention.

[0015]

As described above in detail, according to the lathe of the present invention, an excellent effect that the entire product can be processed with high accuracy and at low cost can be obtained with a simple and small configuration that does not require any accessory device.

[Brief description of the drawings]

FIG. 1 is a schematic view of a lathe showing an embodiment of the present invention.

FIG. 2 is a sectional view of a headstock in the lathe.

FIG. 3 is a sectional view showing a turning method by the lathe.

FIG. 4 is a sectional view showing a step subsequent to FIG. 3;

FIG. 5 is a view showing a step subsequent to that of FIG. 4;

FIG. 6 is a sectional view showing a step subsequent to FIG. 5;

[Explanation of symbols]

1. feeder, 2. spindle head, 3. spindle, 4. first chuck, 5. second chuck, 6. first turret,
7 2nd turret, 9 cutting tool, 10, 11 turning tool, 12, 17 stopper, 14 through hole, R
..Bars, W..Cutting pieces.

Claims (4)

[Claims] 1. A feeder for supplying a bar, a main shaft having a through hole through which the bar can be inserted, a headstock rotatably supporting the main shaft, and a bar held by one end of the main shaft close to the feeder. A first chuck, a first tool rest including a cutting tool for cutting a bar held by the first chuck and a turning tool for turning the cut piece, and a cut piece pushed through a through hole of a main shaft by the bar. A lathe comprising: a second chuck gripped at the other end of the spindle far from the feeder; and a second tool rest including a turning tool for turning a cut piece gripped by the second chuck. 2. The lathe according to claim 1, wherein the first chuck is provided with a stopper for positioning the bar in the axial direction of the spindle. 3. The lathe according to claim 1, wherein a stopper for positioning the cut piece in the axial direction of the spindle is provided on the second tool rest. 4. The lathe according to claim 1, wherein the bar is supplied to the first chuck by a feeder, the tip of the bar is gripped by the first chuck, and the bar is cut to a required length by a cutting tool of the first tool rest. Cut into pieces, the protruding portion of the cut piece is turned with a turning tool of the first tool post, the cut piece is released from the first chuck, and the cut piece is extruded with a bar through the through hole of the main shaft toward the second chuck, A turning method comprising: gripping a cut piece with a second chuck; and turning a protruding portion of the cut piece with a turning tool of a second tool post.