JPS637202A - Automatic lathe - Google Patents

Abstract

PURPOSE:To improve workability in the operation of a railstock by moving a langthwise feed bed away from a workpiece in the exchange thereof and keeping the tailstock away from the workpiece. CONSTITUTION:A cutter rest 8 is provided on a lengthwise feed bed 5 moving along primary guide passages 4 and 4 so located as to sandwich the center line of a main spindle 2. A tertiary guide passage 10 is provided on the bed 5 in a direction along the center line of the main spindle 2 an a tailstock 12 is guided along the passage 10. By loosening a clamping screw 15, the center 11 of the tailstock 12 is positioned at a predetermined location for a workpiece and retains the workpiece for machining. When the workpiece is exchanged, the tailstock 12 is moved back and forth together with the bed 5. Workability, therefore, is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an automatic lathe equipped with a tailstock that supports the tip of a workpiece.

[Prior Art] A conventional automatic lathe with a tailstock is designed to avoid interference with the tailstock, which is located on the spindle centerline and reciprocates toward the spindle. A guide path parallel to the direction of the spindle center line is provided in the main shaft, a longitudinal feed table is provided so as to be movable along this guide path, and a tool rest is provided on the longitudinal feed table so as to be movable in a direction perpendicular to the direction of the spindle center line. It is set up.

[Problems to be Solved by the Invention] In the above conventional example, the longitudinal feed bar holding the tool post is guided by a guide path provided only on one side of the spindle center line, so the point of action of cutting resistance during cutting is reduced. is located away from the guide path, and a force acts on one side of the guide path of the longitudinal feed in the direction of lifting the longitudinal feed. For this reason, there was a problem in that the movement of the longitudinal feedstock in the direction of the spindle center line could not be performed accurately and smoothly. Because it is fixed in place by.

When exchanging workpieces, the tailstock must be manually moved back, resulting in poor workability.

SUMMARY OF THE INVENTION An object of the present invention is to provide an automatic lathe in which the turret moves smoothly in the direction of the spindle center line and the tailstock has excellent workability.

[Means for solving the problem] The problem with the above-mentioned conventional technology is that the bed, the headstock provided on the bed and on which the main spindle is rotatably mounted, and the main spindle mounted on the bed with the center line of the main spindle in between. The first child feeder moves in the direction of the spindle center line along a pair of first guide paths provided on the first child feeder, and moves in the direction perpendicular to the main spindle centerline along a second guide path provided on the first child feeder. a tailstock movable in the direction of the spindle center line along a third guide path provided on the longitudinal feedstock; This problem can be solved by using a structure that includes tailstock fixing means for arbitrarily fixing the relative position with respect to the bed.

[Function] Since the longitudinal feed base with a U-shaped tool rest moves along a pair of first guide paths provided on both sides of the spindle center line, the cutting resistance acting point during cutting is is located between the pair of first guide paths, and the cutting resistance is almost equally received by the first guide paths on both sides, so that the movement of the longitudinal feed table in the direction of the spindle centerline is smooth. Further, a third guide path is provided on the longitudinal feed in the direction of the spindle center line, and a tailstock is provided so as to be movable along this guide path, so that the tailstock is fixed to the bed regardless of the movement of the longitudinal feed. Since the tailstock fixing means is provided, the tip of the workpiece can be supported by the tailstock regardless of the feed of the longitudinal feedstock or tool post during cutting.

- On the other hand, when the tailstock fixing means for fixing the tailstock to the bed is loosened, the tailstock moves together with the potato feeder.

Therefore, when the longitudinal feedstock moves away from the workpiece for workpiece replacement by loosening the tailstock fixing means when changing the workpiece, the tailstock also moves away from the workpiece. Workpieces can be replaced without retracting the tailstock.

In addition, when the longitudinal feed moves toward the workpiece to process a new workpiece, the tailstock also approaches the workpiece, so you can move the tailstock slightly to center the tailstock. can be brought into contact with the workpiece.

[Example] An example of the present invention will be described below with reference to FIGS. 1 and 2. A headstock 3 on which a spindle 2 is rotatably mounted is fixed on the bed l. Further, a first guide path 4.4 is provided on the bed 1 in the direction of the spindle center line of the spindle 2, and the longitudinal feed base 5 can move in the direction of the spindle center line along this first guide path 4.4. It is set in. A second guide path 6 is provided on the longitudinal feed 5 in a direction perpendicular to the spindle center line, and a tool rest 8 equipped with a tool 7 is movable along the second guide path 6. It is provided facing the main shaft 2. Here, the movement control of the longitudinal feed stand 5 and the tool rest 8 is N
In the G automatic lathe, this is performed by an NC device (not shown).

Further, a third guide path 10 is provided on the longitudinal feed 5 in parallel to the main spindle center line direction, and a tailstock 12 equipped with a center 11 disposed opposite to the main spindle 2 is connected to the third guide path 10. It is provided in one stitch that is movable along the guide path 10. The tailstock 12 is arranged parallel to the third guide path 10 and the guide rod 1
The guide rod 13 is provided movably along the bed 3, and both ends of the guide rod 13 are fixed to a fixing bracket 14 fixed to the bed 1. Further, the tailstock 12 can be fixed to the guide rod 13 with a clamp screw 15.

As shown in FIG. 3, the tailstock 12 has a psychological shaft 20 that holds the center 11. In the embodiment, the piston 22 is fixed integrally with the tailstock 12, and the psychological shaft 20 moves forward and backward by hydraulic pressure.

FIG. 4 shows another embodiment of the tailstock fixing means, in which a hydraulic cylinder 30 is used in place of the clamp screw 15. In the same figure, as the piston 31 rises, the tailstock 12 is fixed to the guide rod 13, and at the same time, the piston 33 of the hydraulic cylinder 32 descends, making the tailstock 12 slidable relative to the longitudinal feed 5. , the piston 31 descends and the piston 33 rises, whereby the tailstock 12 is fixed to the longitudinal feed 5 and becomes movable together with the longitudinal feed 5.

Next, the effect will be explained. In the case of Figures 1 and 2, loosen the clamp screw 15 and move the tailstock 12 to the third guide path.
O and guide rod! 3, and move the tailstock 12 so that the center 11 is at a predetermined position with respect to the workpiece 40.
Arrange. Then, the clamp screw 15 is tightened to fix the tailstock 12 to the guide rod 13. In the case of Figure 4,
The piston 31 is raised to fix the tailstock 12 to the guide rod 13. In this state, the hydraulic cylinder 2 of the tailstock 12
By operating 1, the tailstock 20 moves forward and supports the workpiece 40 at the center 11.Next, the potato feeding table 5 is moved along the first guide path 4.4, and the tool rest 8 is moved along the second guide path. By appropriately moving the main shaft 2 along the path 6,
Machining is performed on the workpiece 40 that has been chucked.

In this way, the longitudinal feed stand 5 where the tool rest 8 is placed is
Since it moves along the first guide path 4.4 provided on both sides of the spindle center line, the point of action during cutting is the first guide path 4.4.
4, the cutting resistance is almost equally received by the first guide paths 4.4 on both sides, and the movement of the longitudinal feed table 5 in the direction of the spindle centerline is smooth. When the workpiece 40 is to be replaced after the workpiece 4o has been machined, this can be done by retracting the center 11 using the hydraulic cylinder 21 shown in FIG.

- On the other hand, when the length of the workpiece 40 is changed, the clamp screw 15 is loosened in the case of FIGS. 1 and 2. Fourth
In the case shown in the figure, the piston 31 is lowered and the piston 33 is raised. This causes the tailstock 12 to move together with the longitudinal feedstock 5. By moving the longitudinal feed 5 toward or away from the workpiece 40 in this way, the tailstock 12 also moves toward or away from the workpiece 40, adapting to the length of the new workpiece 40. The tailstock 12 can be placed in the position where the new workpiece 40 is placed.
can be chucked by the main shaft 2 and supported by the center 111.

In this way, it is not necessary to manually move the tailstock 12 significantly, resulting in excellent workability.

[Effects of the Invention] As is clear from the above description, according to the present invention, the longitudinal feed stand in which the tool rest is placed a is arranged in the first guide path provided on both sides of the spindle center line. Because it moves along
Cutting resistance during cutting is almost equally received by the first guide paths on both sides, and the movement of the tool post in the direction of the spindle centerline is smooth. Further, a third guide path is provided on the longitudinal feed in the direction of the spindle center line, and a tailstock is provided movably along this guide path, so that the tailstock is moved to the bed regardless of the movement of the longitudinal feed. Since the tailstock fixing means is provided, when changing the length of the workpiece, it is only necessary to move the tailstock together with the longitudinal feed, and manual changes are also easy and workability is excellent. Complete automation is also possible by configuring the table fixing means as in the second embodiment and moving the first child feeding table using NC.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing one embodiment of the present invention, and Fig. 2 is a plan view showing an embodiment of the present invention.
3 is a sectional view of the tailstock, and FIG. 4 is a front view showing another embodiment of the tailstock fixing means. 1: bed, 2: main shaft, 3: headstock, 4: first guideway, 5: longitudinal feed, 6: second guideway, 8: turret,
10: Third guideway, 12: Tailstock,
13 Guide rod, 14: Fixed bracket, 15:
clamp screw. 30.32: Hydraulic cylinder. Figure 1 Figure 2 Figure 11! Figure 3 +2:lUf〒stand

Claims (1)

[Claims] Movement in the direction of the spindle centerline along a bed, a headstock provided on the bed and on which the spindle is rotatably mounted, and a pair of first guide paths provided on the bed across the spindle centerline. a second longitudinal feed provided on the longitudinal feed
a tool rest movable along a guide path in a direction perpendicular to the spindle center line direction; a tailstock movable in the spindle center line direction along a third guide path provided on the longitudinal feed; An automatic lathe comprising tailstock fixing means for arbitrarily fixing the relative position of the tailstock to the bed regardless of movement of the longitudinal feedstock.