JPH0581361B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a back surface processing device for processing the back surface of a workpiece that has been processed using a bar processing lathe and separated by parting. It is something.

[Conventional technology]

In bar processing lathes such as automatic lathes, the bar is gripped and rotated by a spindle chuck, various turning processes are performed, and then the workpiece is cut off from the bar by parting. However, after this cut-off process, the back surface of the workpiece (cut-off surface) may be further subjected to back-side processes such as doweling, drilling, tapping, and face milling.

In order to efficiently perform such back machining with a single lathe, automatic lathes have traditionally been equipped with an arm with a chuck that grasps the workpiece from the front side, and the workpiece is cut off immediately before cutting. The machine grips and performs parting, and the workpiece (hereinafter referred to as semi-finished product) cut by parting is transferred to a back processing position different from the normal turning position by the rotation of the arm. A back surface processing device is used that performs various types of back surface processing using tools provided therein.

In an automatic lathe with such a back processing device, an independent back processing device is provided separately from the main spindle, tool post, etc. that perform normal turning processing in an automatic lathe, so not only does the configuration of the device become complicated. , because the turning radius of the arm must be ensured, the volume required to configure it as a lathe with a back processing device is large, and further disadvantages include the long movement distance of the arm, which wastes time. It was hot.

[Problem to be solved by the invention]

In view of the above facts, it is an object of the present invention to provide a back surface processing device that has a simple configuration and can efficiently perform back surface processing.

[Means to solve the problem]

In order to solve these problems, the back processing device according to the present invention has a main spindle, a cross feed table that moves toward and away from the main spindle in the direction of the spindle center line and slides perpendicular to the spindle center line. , are provided on the cross feed table and are arranged opposite to each other across the spindle center line, each having a plurality of tools, and the tools are selected and used for machining the bar gripped by the spindle. A bar machining lathe having a pair of tool rests, a back processing main spindle provided parallel to the center line of the main spindle and located between the pair of tool rests and facing the main spindle; a back processing headstock that rotatably supports a back processing spindle; a vertical slide that slidably supports the back processing headstock along the spindle centerline; and a vertical slide that slides perpendicularly to the spindle centerline. A lateral sliding table that can support the back processing headstock and the back processing headstock are moved in a direction orthogonal to the spindle centerline direction to a first position that is a back processing position and a second position that is opposite to the main spindle on the spindle centerline. A lateral sliding table is provided on the traverse feed table and includes first and second positioning and holding means for positioning and holding the back processing headstock in the position, and a lateral sliding table is provided on the lateral feed table to support the back processing headstock. A first positioning and holding means for positioning and holding the lateral sliding table at a first position presses and holds the lateral sliding table against a stopper means of the lateral sliding table so that the lateral sliding table and the lateral sliding table are positioned and held. a first cylinder device provided between the back processing headstock and the second cylinder device;
A second positioning and holding means for positioning and holding the lateral sliding table presses and holding the lateral sliding table so that the lateral sliding table is positioned and held regardless of movement of the lateral sliding table and a support guide table. a second cylinder device having a higher output than the first cylinder device, and positioning the back processing headstock at a first position, which is a back processing position, and positioning the back processing headstock on the cross feed table. The first tool rest is configured to process the bar held by the main spindle, and at the same time, the second tool rest is used to process the semi-finished product held by the back processing main spindle.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a plan view schematically showing a bar processing lathe equipped with a back processing device according to the present invention.
It has a main shaft 7 rotatably supported by the main shaft 7, a guide bush 2 provided on the center line of the main shaft 7, and a cross feed table 3 provided opposite to the main shaft 7. A turret tool rest 4 and a second turret tool rest 5 are provided facing each other with the spindle center line in between.

The bar 6 is gripped by the chuck of the main shaft 7, guided by the guide bush 2, and driven by a tool, e.g.
Processed by 3,45. The lateral feed table 3 is attached to a support guide table (not shown) on the bed so as to be slidable in the lateral direction (in the vertical direction in FIG. 1) perpendicular to the center line of the spindle, and is driven and controlled by an NC device (not shown).

FIG. 2 is a perspective view schematically showing the back processing device of the present invention, and shows the back surface provided on the second turret tool rest 5, which is one of the turret tool rests provided on the traversing table 3. As will be described later, a lateral sliding table 10 is attached to the processing device so as to be slidable in the lateral direction perpendicular to the spindle centerline, which is the direction of arrow A.
The back surface processing is integrated with a vertical sliding table 12' that slides vertically on the horizontal sliding table 10 by two guide rails 11 provided vertically along the spindle center line. The headstock 12 is vertically slidable.

A pulse motor 13 is attached to the horizontal sliding table 10, and a feed screw 14 rotated by the pulse motor 13 moves the back processing headstock 12 to the vertical sliding table 12'.
It is also sent vertically.

FIG. 3 is a front sectional view of the back processing device of the present invention, and as shown in detail in this figure, a hollow back processing spindle 15 is rotatably supported on the back processing headstock 12 by bearings 16, 16. A collector chuck 17 is housed at the tip of the back processing main shaft 15, and a tubular chuck sleeve 18 for opening and closing the collector chuck 17 is provided so as to be slidable in the axial direction. Chuck sleeve 18
A pusher 19 for sliding passes through the hollow back processing spindle 15 and protrudes from the rear end of the back processing spindle 15, and a two-pronged chuck is attached to the groove of a ring 20 that is rotatably attached to the protrusion. The tip of the lever 21 is engaged, and this chucking lever 2
1 is swingably supported by a pivot 22, and swings as a piston rod 24 of a cylinder 23 moves in and out to slide the chuck sleeve 18 and open and close the collector chuck 17.

The pusher 19 is further hollow, and a knock out rod 25 is provided therein for discharging the finished product whose back side has been processed.
The piston rod 27 of No. 6 moves forward by protruding, and the finished product with the back side machining is collected into the chuck 17.
It is configured to push out more.

The back processing main shaft 15 is connected to the rotating shaft of a drive motor 30 (FIGS. 2 and 4) via a pulley 28 and a belt 29, and is rotated by the rotation of the drive motor 30.

4 and 5 are a right side view and a plan view of the back processing device of the present invention, and as shown in FIG. The back machining spindle 15 is provided in the vicinity of the second turret tool rest 5 between the first and second turret tool rests 4 and 5.

As is clear from FIGS. 4 and 5, the lateral sliding table 10 includes a sliding guide member 31 that is directly fixed to the housing of the second turret tool rest 5, and a sliding guide member 31 that is directly fixed to the housing of the second turret tool rest 5. It is possible to slide in the lateral direction by a slide consisting of a guide rail 32 fixed to a lateral sliding table 10 guided by a lateral slide.

A stopper screw 41 provided on the second turret tool rest 5 and a stopper seat 42 provided on the lateral slider 10 are provided on the upper surface of the lateral slider 10.

The stopper screw 41 and the stopper seat 42 are
When the piston rod 39 of the cylinder 38, which will be described later, protrudes and presses the stopper seat 40, the lateral sliding table 10 moves to the right in FIG. It constitutes a first positioning and holding means that positions and holds the relative positions of the tool rests 4 and 5 on the table 3 and the back processing spindle 15 at a predetermined relative position (first position).

An arm 34 is provided hanging down on the back side of the lateral sliding table 10 (right side in FIG. 4), and a stopper screw 35 adjustable at the lowest end serves as a support for supporting and guiding the lateral sliding table 3. It is fixed to an arm 3' fixed to a guide stand (not shown) to cut off the back processing spindle 15, i.e., at a second position on the spindle center line.
It can come into contact with the piston rod 37 of the cylinder 36 that is positioned and held in position, and the cylinder 3
As the piston rod 37 of No. 6 protrudes, the lateral sliding table 10 slides to the left in FIG. 7 to the second position O, which is on the center line of
It constitutes positioning and holding means.

Above the stopper screw 35, there is a back processing spindle 1.
A cylinder 38 is provided for holding the position of 5 in the first or second position. This cylinder 38
has a smaller diameter than the cylinder 36 that positions the back processing spindle 15 in the second position, so when the piston rod 37 of the cylinder 36 protrudes, it is pushed back due to the difference in output, and cooperates with the cylinder 36 to move the back processing spindle 15 in the second position. It acts as a pressure holding means that presses and holds.

Next, the operation will be explained. In Figure 1,
Turning of the bar 6 held by the spindle 7 is carried out by moving the headstock 1 forward to the left, selecting the first or second turret turret 4, 5, and turning the bar 6 held by the spindle 7, as shown in the figure. By approaching the bar 6 and indexing and rotating the turret tool rests 4 and 5, the tools 43, 45, etc. attached to the turret tool rests 4 and 5 are selected, and the tools 43, 45, etc. attached to the turret tool rests 4, 5 are selected, and the tools 43, 45, etc., mounted on the turret tool rests 4, 5 are selected, and the tools 43, 45, etc., which are attached to the turret tool rests 4, 5 are selected, The well-known turning process is performed by combining the lateral movement of the traverse feed table 3 and the axial movement of the main shaft 7 by approaching each other alternately. When the predetermined turning process is completed, the bar 6 is separated by a parting process to become a semi-finished product 6a, and the processing steps in the parting process on the main spindle are as follows.

First, the transverse feed table 3 is moved to the front side (to the left in FIG. 4), and the second turret tool rest 5 is sent to the cutting-off standby position shown in FIG. In this cutting-off standby position, the piston rod 39 of the cylinder 38 protrudes, so the lateral sliding table 10 moves relatively to the right, the stopper screw 41 and the stopper seat 42 come into contact, and the main shaft center line of the main shaft 7 With respect to O, the center O' of the back processing spindle 15 is deviated to the right.

Next, the piston rod 37 of the cylinder 36 is projected to move the lateral sliding table 10 to the left,
Align the back machining spindle center O' with the spindle center O.
At this time, even if the piston rod 39 of the cylinder 38 remains protruding, the inner diameter of the cylinder 36 is larger than the inner diameter of the cylinder 38, so the output of the cylinder 36 is greater, and the output of the cylinder 36 causes the piston rod 39 of the cylinder 38 to is pushed back, the lateral sliding table 10 moves to the left in FIG. 4, and the piston rod 37 stops at the most protruding position.
The lateral slide 10 is pressed and held by a piston rod 37 of a cylinder 36 and a piston rod 39 of a cylinder 38.

The back machining spindle center O' and the spindle center O can be precisely aligned by adjusting the stopper screw 35. Since it is installed on the arm 3' fixed to the support guide table (not shown) of the transverse feed table 3 which does not move, it remains at a constant position regardless of the position of the cross feed table 3, that is, the center O' of the back machining spindle. It is held at a parting position (second position) where the main shaft center O and the main shaft center O coincide with each other.

As mentioned above, the piston rod 37 (second cylinder device) of the cylinder 36 has a larger output than the output of the piston rod 39 (first cylinder device) of the cylinder 38, so that the lateral sliding table can be moved A second positioning and holding means is configured to press and hold the back processing headstock at a second position (cutting processing position) and position it regardless of the movement of the back processing headstock.

Next, the back machining headstock 12 is advanced toward the headstock 1 by the pulse motor 13, the collect chuck 17 of the back machining spindle 15 is opened, and the collet chuck 17 is opened at the most advanced position of the back machining headstock 12.
is closed to grip the tip of the bar 6, and the motor 30 rotates the back machining spindle 15 at the same speed and in the same direction as the main spindle 7 of the lathe, thereby gripping and rotating the bar 6 together with the main spindle 7.

Subsequently, the cross feed table 3 is sent to the left in FIG. 4 by the NC device, and the bar 6 is cut off by the cut-off bit 44 attached to the second turret tool rest 5.
At this time, the back processing headstock 12 is
A cylinder 38 provided on an arm 34 hanging down from 0 acts as a gas spring, and the cylinder 36
Since the lateral sliding table 10 is pressed against the piston rod 37 and is positioned and held by the second positioning and holding means, the back processing main shaft 15 does not move laterally as the lateral feeding table 3 moves.

When the parting process is completed, the piston rod 37 of the cylinder 36 retreats, the back-machining spindle 15 retreats to the back-machining position (first position), and the cross feed table 3 retreats to the position shown in FIG. On the headstock 1 side, the bar 6 in the spindle 7 is pushed out by a predetermined amount, the tool 43 of the first turret tool rest 4 to be used for the next machining is selected, and the next machining is started.

The piston rod 3 of the cylinder 38 serves as a first positioning and holding means for positioning and holding this back processing headstock at the back processing position (first position).
9 is operated, and the lateral sliding table is pressed against and held by the stopper means of the traversing table to position and hold it, and is provided between the lateral sliding table and the lateral feeding table.

Then, on the back processing device side, after confirming that the cross feed table 3 has retreated to a predetermined position, the second turret tool rest 5 is indexed and rotated to select a tool for back processing, and the tool attached to this is selected. The semi-finished product 6 is gripped by the back processing spindle 15 using various tools, such as the slitter 45 in FIG. 1 or the drill 46 in FIG. 2.
Process the back side of a.

That is, in the example shown in FIG. 1, the back processing spindle 15 is stopped, and the back surface of the semi-finished product 6a is cut using a rotary tool (slitter) 45 fixed to a secondary processing tool shaft attached to the second turret tool rest 5. In addition, in the example shown in FIG. 2, the back processing main spindle 15 is rotated, and a drill 46 fixed to the second turret tool rest 5 is used to perform hole drilling from the back surface.

At this time, the piston rod 39 of the cylinder 38
By protruding, the stopper screw 41 and the stopper seat 42 come into contact with each other, and the center of the back processing spindle 15 is positioned and held at the O' position.

The finished product, which has been processed on the back side, is pushed out by the piston rod 27 of the cylinder 26 and pushed out by the knockout rod 25, and at the same time the collector chuck 17 is pushed out.
is opened by the operation of the cylinder 23, and the finished product is knocked out.

〔Effect of the invention〕

As is clear from the above, according to the present invention, the back processing spindle moves vertically to grip the bar processed by the headstock and receives the cut-off semi-finished product, and the back processing spindle moves horizontally. Since the machine is configured to move in the direction and perform back side machining at a position away from the center of the spindle of the headstock, the movement speed of each part is fast and the machine can be made compact with a simple structure. Furthermore, after cutting off a bar, the next bar can be processed on the headstock immediately, so the work can be carried out efficiently.

[Brief explanation of the drawing]

Fig. 1 is a plan view schematically showing a lathe equipped with a back processing device according to the present invention, Fig. 2 is a perspective view showing the main parts of the lathe, and Fig. 3 is a cutaway view of the main shaft portion for back processing. FIG. 4 is a front view of the back processing headstock, FIG. 4 is a side view of the main part of the present invention as seen from the headstock side, and FIG. 5 is a plan view of the same. 1... Headstock, 2... Guide bush, 3...
Transverse feed stand, 4... 1st turret tool rest, 5...
Second turret tool rest, 6... Bar material, 6a... Semi-finished product, 7... Main shaft, 10... Lateral sliding base, 12
...Back processing headstock, 12'...Vertical sliding table,
15... Back processing spindle, 23... Cylinder, 24
...Piston rod, 26...Cylinder, 27...
...Piston rod, 35...Stopper screw, 36
...Cylinder, 37...Piston rod, 38...
...Cylinder, 39...Piston rod, 41...
Stotsupa screw, 42... Stotsupa seat.

Claims (1)

[Scope of Claims] 1. A main spindle, a transverse feed table that moves toward and away from the main spindle in the direction of the center line of the main spindle and slides perpendicular to the center line of the main spindle, and a cross feed table that is provided on the cross feed table and that is attached to the center line of the main spindle. A tool for bar processing, which is arranged facing each other with the two tools in between, each having a plurality of tools, and a pair of tool rests for selecting the tools and using them to process the bar gripped by the spindle. In the lathe, a back machining spindle that is parallel to the spindle center line, located between the pair of tool rests and facing the main spindle, and a back machining spindle that rotatably supports the back machining spindle. a table; a vertical sliding table that supports the back processing headstock so as to be slidable along the spindle center line; and a horizontal sliding table that supports the back processing headstock so as to be slidable orthogonal to the spindle centerline; First and second positioning in which the back processing headstock is moved in a direction perpendicular to the spindle centerline direction and positioned and held at a first position, which is a back processing position, and a second position, which is opposite to the spindle on the spindle centerline. holding means, a lateral sliding table for supporting the back processing headstock is provided on the lateral feed table, and a first positioning and holding means for positioning and holding the back processing headstock at the first position. a first cylinder device provided between the lateral sliding table and the traversing table so that the lateral sliding table is held in position by being pressed against the stopper means of the lateral sliding table; The second positioning and holding means positions and holds the back processing headstock at the second position, and the second positioning and holding means presses and holds the lateral sliding table so that it is positioned and held regardless of movement of the lateral feed table. a second cylinder device which is provided between the lateral sliding table and the guide holding table and has a higher output than the first cylinder device; and the back processing headstock is at the back processing position. the first position on the traversing table;
Processing the bar material held by the main shaft with the tool rest of
A back processing device for a bar processing lathe, characterized in that a second tool post simultaneously processes a semi-finished product held by the back processing spindle.