JPS5920883Y2 - Bar positioning device for automatic lathe - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a bar positioning device that guides a bar inserted into the main spindle of an automatic lathe with a bar feed device by a required amount from the end of the main spindle into a processing area.

``Method and device for supplying stock in a machine for machining burst stocks'' and ``Method and device for supplying stock in a machine for machining burst stock'', as a conventional device for feeding the required amount of bar material from the end of the main shaft to the machining area.
5028 rNCNC Lathe Drilled Bar Material Feeding Method”.

In the former method, a gripper that elastically grips the end of the bar is attached to one side of the turret turret, and with the gripper gripping the end of the bar, the turret turret is moved away from the front of the spindle. The bar is moved by the required amount, thereby drawing out the required amount of the bar material into the processing area.

This method allows the bar to be fed to the full diameter of the axial through hole without adding a special bar pull-out device.
It has the feature that the bar feed length can be easily changed.

However, since the end of the bar is gripped by an elastic gripper, the gripping force becomes unstable due to variations in the diameter of the bar.Especially when pulling out a long bar with a large diameter, the gripping force of the gripper This had the disadvantage that the gripping part would burr due to the shortage, making it impossible to feed the bar to an accurate length.

In addition, it was necessary to change the gripper to accommodate changes in the bar diameter, which required setup time.

Next, in the latter method, a groove is formed on the outer periphery of the protrusion from the tip of the main shaft of the bar that is left behind at the same time as the parting operation after a series of machining cycles is completed, or immediately after, and an engaging member is inserted into the groove. By engaging the tool rest and moving the movable body away from the front surface of the spindle, the bar material is pulled out by a required amount into the processing area.

However, when cutting a groove with a parting tool to engage an engaging body at the end of a bar, depending on the shape of the workpiece, it may not be possible to cut the groove due to the cutting allowance.

For this purpose, the bar must be protruded to some extent from the end of the main shaft, and after being pulled out using the pull-out groove,
``This resulted in wasted materials such as scraping and wasted machining time.

Furthermore, even if the engaging body is fitted into the groove when pulling out the bar, the core in the direction in which the engaging body is inserted will not come out.
When the bar is pulled out during rotation, the tip of the bar swings out, making it difficult to align it with the center of the tailstock.

The present invention is intended to solve these problems, and its first purpose is to remove the remaining bar after a series of machining cycles is completed and the cut-off operation is performed to a diameter of the bar. Regardless of the size, the protruding end of the bar is supported and centered by the countersunk center, and the NC-controlled turret moves from the spindle end to the required machining area without giving any impact. The point is that it can transport materials.

The second object is that even if the material is fed during rotation, the material can be fed without the tip of the bar swinging, so that the material feeding force of the bar feeding device can be small.

Furthermore, the third purpose is that the chamfered part of the bar or the center hole of the end face is received with a countersunk center or a normal center.
Compared to the pull-out method using engagement with the groove, a smaller pull-out amount is required and parting can be performed near the chuck jaws.

That is, since the holder portion can be made thinner than the gripper, the processing area can be expanded.

Examples will be described below with reference to the drawings.

FIG. 1 is a plan view showing a state in which a known weight type bar feed device is attached to the rear end of the main spindle of an automatic lathe such as an NC machine;
The figure is also a surface diagram.

In the figure, the weight type bar feed device attached to the rear end of the main shaft is equipped with two supports 18 and 19 on a base 17 placed horizontally on the floor. Behind the main shaft, on the main shaft axis, a bar feed guide tube 16 is supported on the pillars 18,19.

A part of the guide tube 16 has a groove 1 along its entire length.
5 is provided, and a pressing member 23 for feeding the bar material is provided in the groove 15.
is guided by the groove 15 and is slidably provided.

One end of the wire 22 is connected to the pressing member 23, and the wire is fixedly supported perpendicularly to the floor surface of the paste 2.
The direction of the wire is changed by a pulley 21.26 rotatably supported on a part of the wire, and a weight 2o of an appropriate weight is suspended from the other end of the wire.

Therefore, the weight 20 causes the pressing member 23 to constantly press the end surface of the bar inserted into the guide tube 16.

In addition, in an automatic lathe such as an NC equipped with a bar feed device, 28 is a saddle movable in the axial direction of the main spindle, and 27
25 indicates a loss slide which is movable on the saddle 28 in a direction perpendicular to the direction of movement of the saddle 28, and 25 is a head I-tsuku.

Reference numeral 4 denotes a three-jaw chuck operated by fluid pressure or a collet chuck attached to the tip of the main shaft 4a, and has a through hole capable of accommodating a bar material.

7 is an indexable tool rest supported on a cross slide 27, on which tools corresponding to the cutting process are attached;
Rotation indexing and X, Z are performed by commands from the C control device 29.
Control of directional movement is performed.

As shown in FIG. 3, the holder 6 attached to one side of the indexable tool rest 7 is provided with a through hole 14 parallel to the spindle axis, and further a snob 9 is inserted into the through hole 14.
The flange portion of the sleeve 9 is fixed to the end surface of the holder 6 on the main shaft side with bolts.

A stopper 10 having a countersunk center shape is rotatably supported on the sleeve 9 via bearings 11 and 12 parallel to the axis of the main shaft.

The plate center in this example may be an ordinary center.

If the center is normally attached to the turret, an automatic machine with another processing turret may be used, and if the center of the tailstock is used, the tailstock is used to drive the direction positioning of the spindle. You can do it like this.

The bar positioning device of the present invention is constructed as described above and operates as follows.

After completing a series of machining cycles using the tools on the tool post 7, the cut-off work of the machined workpiece is performed using the cutting tool on the tool post, and the end face of the protruding part from the end of the main shaft of the bar remaining immediately after that is cut off. The chamfering process is also performed using a tool attached to the tool post 7.

Next, a countersunk center-shaped stopper 10 attached to the tool rest 7 is indexed on a horizontal plane including the spindle axis, and a countersunk center-shaped stopper 10 is indexed on a horizontal plane including the spindle axis, and a countersunk center-shaped stopper 10 is mounted near the chamfered portion of the end surface of the bar according to a command from the NC device 29. Move the seat and collar 10.

At the same time as the claws 8 of the power chuck 4 open in response to a command from the NC device 29, the stopper 10 in the shape of a center plate moves backward in the Z-axis direction at a fast running speed (approximately 10 m/m1n).

At this time, the bar 5 is fed to the processing area by the required amount by the weight type barfit device, following the feed rate of the stopper 10 as shown in FIG.

Therefore, since no impact is applied to the stopper during sizing, the strength of the holder 6 is not required to be very strong.

Furthermore, since the countersunk center supports the chamfered part machined on the end face of the bar, it can be centered regardless of the diameter of the bar! Furthermore, even if the material is fed during rotation, stable material feeding is possible without the tip of the bar being swung around.

In this embodiment, an example was explained in which a weight type bar feed device was attached to an automatic lathe such as an NC lathe.

However, as the bar feeding device, it is also possible to use a known roller bar feeding device such as "Automatic Bar Feeding Device" disclosed in Japanese Utility Model Publication No. 52-104175, and a hydraulic or electric bar feeding device.

In either case, adjust the feed speed of the bar feed device to be slightly faster (approximately 12 m/min) than the fast running backward speed of the stopper (approximately 10 m/m1n), and always check the chamfered part of the end surface of the bar even during material feeding. Disc center type stopper 1
It is necessary to feed the material while pressing 0.

In other words, the amount of protrusion of the bar from the end of the chuck into the processing area is N.
Since it is determined by the positioning function of the C-controlled tool post,
Accurate positioning is possible, and fully automatic operation is possible because it is controlled by NC.

Furthermore, if various centers are attached to the tool rest, the tool rest can be selectively indexed and used depending on the shape of the bar to be machined.

Furthermore, if the end of the bar is guided close to the existing Shinshindai using the NC function and the center of the Shinshindai is used, the axial movement of the center can be reduced and the accuracy of the Shinshindai can be improved.

As stated above, the present invention is not limited to the configuration □ shown in the examples, and changes are expected within the scope of the technical idea of the present invention as described in the claims. be.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a weight type bar feed device attached to an NC lathe, Fig. 2 is a side view of the same, and Fig. 3 is a partial sectional view of a bar positioning device attached to a tool rest. Shows the state in which the edge of the material is supported. FIG. 4 shows the state where the bar material is received at the dish center and the required amount of material is fed. In the figure, 1...NC lathe, 2...
Support column, 3...Tailstock, 4...Chuck, 4a...Main shaft, 5...Bar material, 6...
...Holder, 7...Turret, 10...
... Countersunk center type strike, collar, 11.12 ... Bearing, 14 ... Through hole, 15 ... Split groove, 16 ... Guide tube, 17...
Base, 20... Weight, 21, 26...
・Pulley, 22...Wire, 23...
Pressing member, 25...Head stock, 27...
・・・□・Cross slide, 28・・・Saddle,
29...NC control device, 30...Power board, 31...Tape reader, 32...
Operation board.

Claims (1)

[Scope of utility model registration request] In an NC automatic lathe, it is movable in the direction of the spindle axis to support the end of the bar that protrudes from the spindle end of the bar that is left behind at the same time as the parting operation after a series of machining cycles is completed, or immediately after that. A holder attached to the tool post, a countersunk center stopper rotatably supported on the holder in parallel with the spindle axis, and the end of the bar in the spindle through hole is pressed against the stopper and follows the movement of the stopper. for an automatic lathe, comprising: a bar feeding device having a material feeding speed that is possible, and feeding the bar by a required amount to a machining area while supporting the end face of the bar at the dish center; Bar positioning device.