JPH0335901A - Automatic lathe for obtaining front and back face-worked shorter pieces from longer material - Google Patents

Abstract

PURPOSE:To obtain a plurality of shorter front and back face worked workpieces with a high accuracy from a large diameter and longer material by clamping a front face worked end portion by the automatic chuck of a second spindle stock, while the longer material is supported by a first spindle stock. CONSTITUTION:When a longer material 12 is supported by an automatic centering support mechanism 11, a lift member 23 is retracted. Then, the longer material 12 is rotated and driven by a first spindle stock 1 to work the end portion of the longer material by a cutter mounted on a turret head 18. When this work is finished, a second spindle stock 2 moves forward to clamp the end portion of the longer material by an automatic chuck 2a. Then, a cutter 19 is actuated to cut the longer material 12. The end portion of the cut longer material 12 is changed to a shorter workpiece 17 supported by the second spindle stock 2. Thus, the longer material 12 from an automatic material feeder 25 is sequentially worked to the shorter workpieces and front and back face worked shorter workpieces are taken.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an automatic lathe for obtaining a plurality of short workpieces machined from the front and back surfaces from a long material.

(Prior art) When processing a relatively small-diameter long material into multiple short parts, the long material is passed through the hollow part of the spindle, gripped by a collet chuck, etc., processed from the front, and then placed on the spindle. Feed to the chuck attached to the opposing spindle for back processing,
There is a type of lathe in which the front end of the long material that has been front-processed is cut off to a predetermined size after the front end of the long workpiece is cut off to a predetermined size for back processing. ,
However, the long materials that can be processed with this lathe require punching through the hollow part of the spindle with a small inner diameter, so for example,
It was limited to those with a small outer diameter of less than a millimeter.

Therefore, when processing a long material with a large outer diameter, the above type of lathe cannot be used.In such cases, the long material must be cut into a number of short materials in advance. The prepared short material is attached to the chuck of the headstock for front machining using the arm of the robot equipped on the automatic lathe.

Once the front machining is complete, the robot again places the short workpiece into the chuck on the headstock for back machining. In this way, in the past, short materials were processed from long materials.

(Problem to be solved by the invention) However, in conventional automatic lathes where the workpiece is automatically attached to the chuck by a robot, the workpiece that has been machined from the front side is handed to the robot and then handed back to the headstock for backside machining, so the chuck Installation errors are likely to occur, especially when the workpiece is short and has a large outer diameter, and the center line of the workpiece is inclined with respect to the centerline of the spindle, increasing the probability that the machined workpiece will be defective. It requires a complicated and expensive robot. Furthermore, it is necessary to cut the long material into short pieces using a cutting device.

The present invention aims to obtain a plurality of short workpieces that have been precisely front- and back-processed from a supplied large-diameter long material.
Another object of the present invention is to provide an automatic lathe with a simple structure that can accurately attach a workpiece machined on a headstock for front processing to a chuck for back processing.

(Means for Solving the Problems) Therefore, the present invention provides an automatic lathe with a first headstock and a second headstock having automatic chucks facing each other and having a common center line in the longitudinal direction; A guide surface that guides the first headstock and the second headstock in the longitudinal direction of the headstock, a movement drive mechanism for each of the first and second headstocks, and a movement drive mechanism for the first and second headstocks. A stand body disposed in between, and a rotor disposed at at least three locations at predetermined intervals around the longitudinal center line, each of which moves the same distance in the radial direction of the long material, and the rotor The automatic top-up support mechanism provided on the stand body rotatably supports the long material by contacting with the automatic top-up support mechanism, which protrudes from the automatic top-up support mechanism toward the second headstock, and the front machining is completed. a cutting device that cuts the end of the long material after it is gripped by the automatic chuck of the second headstock; and when the first headstock moves, it advances from the retracted position and cuts the bottom surface of the long material. It is characterized by comprising a support device that supports the.

(Function) The first headstock is driven to rotate in order to face-process the tip of the long material supported by its automatic chuck and automatic lifting support mechanism, and when the rotation is stopped, it is driven by the movement drive mechanism to move. Then, the lower surface is supported by the support device and the tζ long material is sent out to the second headstock side.

The second headstock moves from a predetermined position and grips the long workpiece, which is supported at both ends protruding from the side with an automatic top support n, with an automatic chuck, and after the gripped part is cut from the long workpiece. , to rotate and drive for back side machining at a predetermined position.

(Example) Next, an example of the present invention will be described with reference to the drawings.

1 to 5 show one embodiment.

The first headstock 1 and the second headstock 2 have automatic chips 1a and 2a facing each other, and are provided on the bed 4 so that the longitudinal center line of each main shaft is common. Each guide surface 5 on the bed 4 guides the shaft in the direction of &190, which is the center of the main shaft, so that it can move. The first headstock I engages with a screw shaft 7 that is rotationally driven by a motor 6, and the second headstock 2 engages with a screw shaft 9 that is rotationally driven by a motor 8. move along.

A stand body 10 is disposed on the bed 4 between the first headstock l and the second headstock 2. And stand body 10
An automatic centering support machine + MII is installed on the top. The automatic centering support mechanism 11, as shown in FIG. A rotor 14 is provided at three locations at intervals at the tip of the TC moving body 13, respectively. The movable body 13 is housed in a stand body lO and held in a frame 15 so as to be slidable in the radial direction of the elongated material 12. And each 61 moving objects 13
can each be moved by the same amount in the same direction by a mechanism similar to a scroll chuck, and the three rotors 14, which are opened and closed by the drive of the opening/closing motor 16, can be rotated by the movable body 13 with high accuracy < 181 rotations by the shaft. It's settled. The stand body 10 and the frame 15 are provided with a long material 1.
There is a hole for 2 to pass through. When one end of the elongated material 12 is supported by the automatic chuck la of the first headstock l and the other end protrudes from the hole and is driven forward by the opening/closing motor 16, the rotor 14 on each movable body 13 moves forward. It comes into contact with the outer periphery of the elongated material 12 and supports it in a sandwiched state.

At this time, the other end of the elongated material is made to be concentric with the center line O. When the opening/closing motor I6 is reversed, rotor 1
4 is moved backward, and the guide surface 5 of each of the first headstock 1 and the second headstock 2 is made common, and the stand body 10 is mounted on the guide surface 5, and the position of the automatic centering support mechanism 11 is adjusted as necessary. It may be possible to change it.

Drum-shaped turret head 1 for machining a long workpiece 12 supported by the first headstock l and automatic centering support [41111 and a short workpiece 17 supported by the second headstock 2
8 is provided behind the cutting position, and can be moved to the cutting position as required.

The short workpiece 17 is obtained by cutting the long material 12 with the cutting device 19. The cutting device 19 is provided in this embodiment on a support base that supports the pivot axis of the turret head 18. Then, by moving the cutting blade 20 from the retracted position to the cutting position at an appropriate time, the protruding portion of the long material 12 from the automatic centering support mechanism 11 can be cut to a predetermined size. The tζ cutting knife 20 shown in FIG. 2 is in the retracted position, and the fc cutting knife 20 is shown in FIG. 5 in the cutting position.

After the protruding portion of the long material 4412 is cut and IC is performed, it is necessary to prevent the long material 12 from being cantilevered when each rotor 14 is retreated to send out the tip again. It is. Therefore, a support device 21 is provided on the side surface of the stand body 10 to support the lower surface of the elongated material 12. In this case, the support device 21 mainly consists of an elevating body 23 having a roller 22 at its upper end, and a horizontal elevating drive 24 for raising and lowering the elevating body 23 between a retracted position and a support position. When the elevating body 23 comes to the support position as shown in FIG. 3, the outer peripheral lower surface of the elongated material 12 is supported by the rollers 22 to maintain the ends of the elongated material 12 at a predetermined height. roller 22
Since they are arranged in a v-shape, the elongated material 12 is also stable in the left and right directions. When the elongated material 12 is sent out in the direction, the roller 226 rotates accordingly, so that the elongated material 12 can be sent out smoothly.

In the automatic lathe of this embodiment, an automatic material feeder 25 is installed between the first headstock 1 and the automatic centering support mechanism 11 in order to automatically feed the long material 12 as shown in FIGS. They are arranged as shown in Figure 5. This automatic feeding device 25 has a recess for receiving the elongated material 12 mainly at the -L portion near the tip, and a elongated material having the same structure as the above-mentioned support device 21 on the inner surface of a pair of fc frame plates 26. Lifting device 2
It has 7. The frame plate 26 is movable while being guided by a guide surface 28 on the bed 4 in a direction perpendicular to the longitudinal direction of the main shaft, and is driven by a movement drive mechanism 29 consisting of a screw shaft and a motor to move between a preparation position and a supply position. do. Furthermore, on the plate frame 26, there is provided a feed-out control device 30, which consists of a flapper 30a and a conveyor 30b, and feeds out the long materials 12 one by one.

Next, to explain the operation, first, the long material 12 is placed on the frame plate 26 of the automatic material supply device 25 as shown in FIG.
moves to the supply position as shown in FIG.
Conveyor 30b of feed control device 30 and automatic stopper 3
By the action of 0a, only one long material 12 is sent to the recessed part at the tip of the frame plate 26, and the material lifting device 27 holds the long material 12 and waits. Then move forward and grab one end of the long material I2 with the automatic chuck la. At this time, there is a space between the first headstock 1 and the automatic material feeder 25. When the first headstock 1 is further advanced, The elongated material 12 is supplied to the automatic centering support mechanism 11 while being horizontally supported by the elevating body 31 of the lifting device 27 and the automatic chuck la. Before the tip of the elongated material 12 reaches the automatic centering support mechanism 11, each rotor is in an open state, and the elevating body 23 of the support device 21 is in a state of being raised to the support position. When the leading end of the long material is sent out by a predetermined length beyond the support device 21, the forward movement of the first headstock l is stopped, and the elevating body 31 of the material lifting device 27
is processed and the plate frame 26 is retreated to the preparation position. Further, the opening/closing motor 16 of the automatic centering support mechanism 11 is operated to close each rotor and support the elongated material 12. When the long material 12 is supported by the automatic centering support Wffllti, the elevating body 23 is retracted. FIG. 1 shows this state. The second headstock 2 in FIG. 1 is in a state where it is machining a short workpiece 17 attached during the previous process.

In addition, if the outer circumferential surface of the long material has a black crust or is not finished with a highly accurate and uniform outer shape over the entire length, the second headstock must be moved forward before being supported by the automatic centering support mechanism 11. force to hold the tip of the long material 12 with the automatic chuck 2a), or attach the center to the automatic chuck 2a,
Support at the center and finish the outer circumferential surface with high precision over the entire length.

Next, the elongated material 12 is rotationally driven by the first headstock l, and the tip of the elongated material 12 is processed with a cutter attached to the turret head I8. Through this machining, the front surface of the workpiece is machined tζ. During this time, the second headstock completes the back side machining of the short workpiece 17, and the short workpiece 17 is now in a state where it can be passed to a machined product counting device (not shown) and the next workpiece can be attached thereto.

When the processing of the tip of the long material 12 is completed, the second headstock 2 moves forward to grip the tip of the long material 12 with the automatic chuck 2a, and then operates the cutting device 19 to cut the long material 12. do. The tip of the cut long material 12 is supported by the second headstock 2 and becomes a short workpiece 17 in the tc state. Then, the second headstock 2 retreats to a predetermined position and performs back side machining of the short workpiece 17 again, while the first headstock l
moves forward and sends out the tip of the long material 1/2 to a predetermined position.At this time, as in the previous case, the elevating body 23 of the support device 21 rises to support the long material 12, and the automatic centering support mechanism 11 is in a state in which the rotor 14 is retracted.

The long material I2 supplied from the automatic material supply device 25 in this manner is sequentially cut into short pieces and delivered as a short workpiece 17 whose front and back surfaces have been processed. Then, as shown in FIG. 5, when the first headstock l reaches almost the forward end and the cutting of the long material 12 is completed, the first headstock l moves back and automatically feeds the remainder of the long material 12. In preparation for the device 25, tζ
After dropping the remaining material onto the conveyor 32, it retreats to the standby position and completes the process. These series of operations are automatically controlled by an automatic control device.

The present invention has been described above with reference to one embodiment, but it goes without saying that the embodiment may vary depending on design conditions and the like.

For example, the support device for supporting the lower surface of the material when the rotor is retracted may not be provided on the stand, but may be provided at an appropriate position on the bed. In addition, the cutting device may be supported not only on the bottom surface (three or more places sandwiching the circumference). It is conceivable to use leather or the like.

(Effects of the Invention) According to the present invention, the long material is supported by the first spindle and the automatic lifting support mechanism, and the front-processed end of the material is gripped by the automatic chuck of the second headstock in the tc state. A robot with a complicated structure is not required, but the workpiece can be picked up accurately. In addition, since the process is performed while cutting a long material to obtain a short workpiece, there is no need to cut the material in advance, and it is possible to easily process materials with various outer diameters and various cutting widths. When processing thin, large-diameter workpieces that are difficult to attach using an automatic chuck, a simple device enables highly accurate automatic attachment and significantly improves the defective rate.

[Brief explanation of drawings]

Fig. 1 is a schematic front view of the automatic lathe, Fig. 2 is a plan view thereof, Fig. 3 is a schematic side view of the automatic centering support device, and Fig. 4 is the first headstock seen in the direction of arrows A and A. Fig. 5 is a schematic side view of the machine, and Fig. 5 is a schematic plan view showing a state in which a long material is being cut. l...First headstock, 1a...Automatic chuck, 2.Second headstock, 2a.Automatic chuck, 4...Bed, 5.Guiding surface, 6.Motor, 7.Screw shaft, 8.. Motor, 9...
Screw shaft, 1o/Stand body, 11 Automatic centering support mechanism 12...Long material, 13/Movable body, 14...Rotor, 1
5. Frame, I6. Opening/closing motor, 17. Short workpiece, 18. Turret head, 19. Cutting device, 2
0. Cutting blade, 21... Support device, 22. Roller, 2
3. Lifting body, 24. Lifting drive mechanism, 25. Automatic material supply device, 26. Frame plate, 27. Material lifting device.
28. Guide surface, 29. Moving part my mechanism, 30. Delivery control device, 3I. Lifting body, 32.. Remaining material removal conveyor.

Claims (1)

[Scope of Claims] An automatic lathe, comprising: a first headstock and a second headstock having automatic chucks facing each other and having a common longitudinal center line; and the first headstock and the second headstock. a guide surface for guiding the headstock in the longitudinal direction of the headstock; a movement drive mechanism for each of the first headstock and the second headstock; a stand body disposed between the first headstock and the second headstock; , having rotors arranged at at least three locations at predetermined intervals around the longitudinal center line and each moving the same amount in the radial direction of the elongated material; an automatic centering support mechanism provided on the stand body that rotatably supports the material; and a mechanism protruding from the automatic centering support mechanism toward a second headstock.
a cutting device that cuts the end of the long material that has been front-face-processed after being gripped by the automatic chuck of the second headstock; An automatic lathe for obtaining a plurality of short workpieces machined from the front and back sides from a long material, characterized by comprising a support device that supports the lower surface of the long material.