JP2002346805A - Feeder combinedly used as stopper of lathe and 2 main shaft opposite lathe equipped with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a phenomenon in which a work is retreated while chuck processing of a bar material, and attain a speeding up of workpiece's gripping change by simplifying work feed operation under processing. SOLUTION: An abutment body 18 that can rotate with a work is provided at the tip of a feed lever 16 of a work feeder. And moreover, a concave-convex engaging pair 20, 36 is provided between the feed lever 16 and the immobility component 37. Accordingly, processing in the state where the work is pushed against the abutment body is enabled, and a direction movement of the feed lever to the axial direction is regulated while processing, a retreat of the work by vibration and cutting-reactive force can be prevented. That is, even if vibration and cutting-reactive force are added during processing, a work cannot retreat, and an exact processing form is assured. Furthermore, retractive motion of the feed lever 16 at the time of processing becomes unnecessary, and operation at the time of the a workpiece's gripping change is simplified, and a time loss can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work feeder which feeds a work into a work through a hollow hole formed in a main shaft of a lathe and feeds the work into the work. Also, the present invention relates to an apparatus for feeding a workpiece in the axial direction when the workpiece is fed in the axial direction during processing and is re-gripped.

[0002]

2. Description of the Related Art When a bar is gripped by a spindle chuck of a lathe and processing is performed, if the processing position is away from the chuck, deformation of the workpiece due to a reaction force of the processing increases, and high-speed processing and high-precision processing are impossible. become. In such a case, the conventional 1
In the main spindle lathe, the tip of the work is held by the tailstock to prevent the work from being deformed due to the reaction force of the machining. However, if this method is adopted in the two-spindle opposed lathe, the distance between the first main spindle and the second main spindle is reduced. The machine must be large because it must be large. In addition, a device for loading and unloading the tailstock on the spindle axis is required, and the machine becomes complicated. Therefore, a machining method in which a workpiece feeding device is provided on a lathe and the workpiece is fed in the axial direction during machining to re-grip the work is adopted.

[0003] That is, when processing a bar material, using a lathe having a hollow hole in the main shaft, the work is inserted into the hollow hole of the main shaft, the work is gripped near the front end of the work, and the front end is processed. Then, the workpiece is processed in the immediate vicinity of the chuck by re-gripping the workpiece, gripping the intermediate portion and processing the intermediate portion. When performing such processing, a work feeder for feeding the work in the axial direction is required when the work is to be gripped.

FIG. 4 is a diagram showing the operation of a conventional two-spindle opposed lathe provided with such a work feeder and the work feeders on the first and second main spindles during machining by arrows. . The first main shaft 1 and the second main shaft 2 have hollow holes 1a and 2a, respectively, and main shaft chucks 3 and 4 are mounted on opposing ends thereof. The work feeding devices 5 and 6 are provided behind the first main shaft 1 and the second main shaft 2 and have feed rods 7 and 8 that advance and retreat in the axial direction on the main shaft axis of the lathe.
A gripper 9 for gripping the tip of the work is provided at the tip of the feed rod 8 on the second spindle side. The work feeder 6 provided with a gripping claw at the tip of the feed rod is capable of pushing and drawing a work.

Normally, the work W is supplied to the rear side of the first main shaft 1, sent out to the front end processing position by the advance (arrow) of the first feed rod 7, and held by the first chuck 3. The axial position of the work when feeding the work is determined by a method in which a stopper attached to a turret (not shown) is advanced onto the spindle axis and the tip of the work is pressed against the stopper.
Can be set accurately. Next, the first feed rod 7 moves backward (arrow).
Then, the first spindle 1 is rotated to process the tip of the work. When the processing of the tip is completed, the first spindle 1 is stopped,
A second forward movement (arrow) is given to the first feed rod 7 to feed the work to the intermediate processing position. Then, the workpiece is gripped by the first chuck 3 and the first feed rod 7 is retracted (arrow), and then the intermediate portion of the workpiece is processed.

[0006] The work W after the machining on the first spindle side is completed.
The second spindle 2 is transferred to the second spindle by the forward and backward movement of the second spindle 2 toward the first spindle and the opening and closing operations of the first and second chucks 3 and 4. At this time, after the second chuck 4 receives the work, the second chuck 4 is retracted until the rear end of the work reaches the holding position of the first chuck, and in this state, the work is transferred from the second chuck 4 to the first chuck 3. After re-gripping, the second chuck 4 is moved forward again to receive the work, thereby allowing the work to be transferred to the hollow hole 2a of the second main shaft.
Is transferred to the second spindle side in a state of being deeply inserted into the shaft.

Then, after the second spindle 2 returns to the original position,
The second spindle 2 is rotated to process the rear end of the work. After the rear end machining of the work, the second feed rod 8 is advanced (arrow) to send the work W to the intermediate machining position on the second spindle side,
After the second feed rod 8 moves backward (arrow), the second main shaft 2 is rotated to process the intermediate portion of the work. In this way,
When all processing is completed, the second feed rod 8 is moved forward (arrow), the tip of the work W is gripped by the gripping claws 9, and the work W is hollowed by the second feed rod 8 by retreat (arrow). It is pulled out from the hole 2a and discharged out of the machine.

During the processing of the workpiece on the second spindle, the next workpiece is fed to the first spindle, and the processing on the first spindle is performed in parallel. Further, since the second feed rod 8 can be fed in the direction in which the work is pulled out, the work on the second spindle side is performed after the middle part is processed, then the work is drawn out and grasped, and finally the rear end is changed. It is also possible to process the part.

[0009]

The problem that the bar material is bent by the processing reaction force when the bar material is gripped and processed by the chuck can be solved by employing the above-described processing method. . However, in chucking of this type of bar material, the bar material retreats due to the vibration of the bar material and the cutting reaction force applied to the work when the bar material is bent or weight imbalance, and the processing accuracy decreases. There is a problem of causing.

That is, although the workpiece is gripped by the chuck, the workpiece is momentarily loosened by the vibration of the workpiece, and when a large axial cutting reaction force acts on the workpiece, the workpiece is slightly gripped. Sliding occurs, retreats the work,
There is a problem that the precision of the shape of the processed work is reduced.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems during bar processing, that is, prevents the work from retracting during bar processing and simplifies the operation of a work feeder during bar processing. Therefore, it is an object of the present invention to speed up a work regripping work.

[0012]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a stopper-feeding work feeder for a lathe according to the present invention is capable of feeding a bar W in an axial direction through a hollow hole formed in a main shaft of the lathe. In a lathe work feeder provided with rods 16 and 29, a non-rotating feed rod 1
6 and 29 are provided between the abutment members 18 and 23 provided at the tips of the lathes so as to be freely rotatable around the axis of the main shaft of the lathe, and the stationary members 37 and 40 for guiding the feed rod and its axial movement. Concave and convex engaging elements 20, 33, 36, 38, 39, and engaging elements 36 provided on the immovable member side and on the immovable member side;
Advancing / retreating devices 42, 43, and 45 for advancing and retracting 38 and 39, respectively.

When a plurality of portions of the bar material W are sequentially gripped and processed, one of the concave or convex one of the engaging elements 20,
38 and 39 are provided at a plurality of positions at predetermined intervals in the moving direction of the feed rods 16 and 29.

When the workpiece W is sent in both directions of being fed into and out of the machine, a gripping claw 25 extending from the contact surface 24 of the contact body 23 of the workpiece feeder to the workpiece W is provided. The feed rod 29 is provided with a gripping claw opening / closing mechanism 30 and a work projection mechanism 44.

When the work feeder of the present invention is provided on a two-spindle opposed lathe, the work feeder combined with stopper according to claim 1 or 2 is provided on the first spindle side, and the stopper according to claim 3 is provided on the second spindle side. Dual-purpose work feeder, that is, contact member 2
3 is provided with a work feeder provided with gripping claws 25,
This is preferable because the supply and discharge of the work to the machine can be automated.

The bar feeder according to the present invention comprises a feed rod 16,
The abutting members 18, 2 which can rotate with the workpiece W at the tip of
Since the contact member 3 is provided, it is possible to perform processing while the contact members 18 and 23 are pressed against the work. According to the present invention, the engagement pairs 20, 33, 36, 38, and 39 are provided between the feed rods 16, 29 and the immovable members 37, 40 so that the shafts of the feed rods 16, 29 during work processing are provided. The directional movement is firmly regulated to prevent the work from retreating due to the vibration of the work and the cutting reaction force.

That is, during machining, the engagement pairs 20, 33, 36,
Since the abutment members 18 and 23 at the tips of the feed rods whose axial movements are restricted by 38 and 39 are pressed against the rear end of the work W, the work W retreats even when vibration and cutting reaction force are applied. Cannot be performed, and an accurate machining shape is thus guaranteed.
Further, by providing such contact members 18 and 23,
The operation of retracting the feed rods 16 and 29 at the time of machining becomes unnecessary, so that the operation of the feed rods 16 and 29 at the time of gripping the work is simplified, and the time loss caused by repeatedly moving the feed rods forward and backward can be reduced. .

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments shown in the drawings. FIGS. 1 and 2 show the operation of a workpiece feeder of a two-spindle opposed lathe in which the workpiece feeder of the present invention is mounted on a first spindle side and a second spindle side, using a projection similar to that of FIG. FIG. 1 is a diagram schematically illustrating the second spindle side, and FIG. 2 is a diagram schematically illustrating a second spindle side.

In the figure, the main shafts 1 and 2 and their hollow holes 1
a, 2a and the chucks 3, 4 are the same as the conventional structure shown in FIG. FIGS. 1 and 2 show turrets 11 and 12 which are omitted in FIG.
Work stopper 1 at one of the tool mounting stations
3, 14 are mounted.

At the tip of the feed rod 16 of the workpiece feeder 15 on the first main spindle side, a contact member 18 that can freely rotate around the main spindle axis via a bearing 17 is mounted. Feed rod 16
Is supported by an immovable member (housing) so as to be movable in the axial direction, and a rear end thereof is connected to a rodless air cylinder 19 for advance and retreat. The feed rod 16 is an elongated rod with a circular cross section, and a circumferential engagement groove 20 is provided at a predetermined location on the outer periphery thereof. In the illustrated example, two engagement grooves 20 are provided at a predetermined distance S in the axial direction. The engagement groove is provided at a predetermined accurate position in association with a chuck holding position of a workpiece to be machined.

The work feeder 2 on the second spindle shown in FIG.
2 is provided with a gripping claw 25 extending from the contact surface 24 of the contact body 23 to the work side, as shown in detail in FIG.
The contact body 23 and the gripping claw 25 are fitted in a sleeve 27 mounted on the tip of a feed rod 29 via a bearing 26, and are freely rotatable around the axis of the main shaft. Between the contact body 23 and the sleeve 27, there is a gripper 2 integrated with the contact body 23.
Spring 2 for urging in the direction of drawing back 5 into sleeve 27
8 are interposed. Inner circumference of sleeve 27 and gripping claw 25
Slope surfaces are provided on the outer periphery of the distal end of the sleeve 27. When the gripping claws 25 are drawn relatively to the inner side of the sleeve 27, the gripping claws 25 contract in diameter and grip the work.

At the base end of the feed rod 29, there is provided a presser cylinder 30 for appropriately preventing the retreating operation of the contact body 23. The tip of the holding rod 32 connected to the piston 31 of the holding cylinder passes through the hollow hole of the feed rod 29, and
3 is near the base end 25a. When the feed rod 29 is retracted in a state where the contact body 23 is in contact with the end of the work and the holding rod 32 is in contact with the base end 25a of the contact body, the feed rod 29
The sleeve 27 that cannot move relative to the sleeve 27 moves to the inner side of the gripping claw 25 to open the gripping claw 25 to release the work.

A flange 34 having an engaging groove 33 on its outer periphery is integrally connected to the piston 31 of the holding cylinder, and an immovable member 40 supporting the feed rod 29 so as to be movable in the axial direction.
Are provided with engaging bodies 38 and 39 which advance and retreat with cylinders 42 and 43 at a predetermined distance S 'in the axial direction of the feed rod. The feed rod 29 is connected via a bracket 35 to a rodless air cylinder 41 for moving the feed rod forward and backward.
Further, a knockout rod 44 is inserted through the axis of the holding rod 32.

Next, a method of processing a workpiece in the same procedure as that of the conventional apparatus shown in FIG. 4 will be described with reference to the arrows shown in FIGS. The workpiece W supplied behind the first spindle 1 is fed to the first processing position by the advance of the first feed rod 16 (arrow in FIG. 1). The work stopper 13 attached to the turret 11 at the time of feeding is positioned on the axis of the main shaft, and defines the feeding position of the work. The engagement groove 20 on the distal end side of the first feed rod 16 is provided at a position where it engages with the engagement body 36 on the immobile member side when the work is delivered to the first delivery position. Then, after the engaging body 36 on the stationary member side is advanced, the engaging pairs 20 and 36 are engaged, and the work stopper 13 is retracted, the first spindle 1 is rotated to process the tip end of the work. . At this time, the contact body 18 of the work feeding device rotates together with the work while being pressed against the work W. The processing reaction force applied to the work is received by the spindle chuck 3 and also by the immovable member 37 via the contact member 18, the feed rod 16, and the engagement pairs 20, 36. Therefore, the tip of the feed rod 16 suppresses the whirling of the base end of the work, and also prevents the work from retreating due to the vibration and the processing reaction force.

When the processing of the front end of the work is completed, the work stopper 13 is again advanced to the second feeding position on the main shaft axis, the first chuck 3 is loosened, the engaging body 36 is retracted, and the feed rod 16 is advanced ( (Arrow in FIG. 1). In the second feeding position, the engaging groove 20 on the base end side of the first feed rod 16 faces the engaging body 36. Then, the engagement body 36
And the first chuck 3 is closed, and the work stopper 1
3 is retracted to perform machining of the workpiece intermediate portion on the first spindle side. Also in this case, the contact body 18 at the tip of the feed rod remains in contact with the rear end of the work W.

When the machining on the first spindle side is completed, the second chuck 4 is opened to advance to the first spindle side, the second chuck 4 is closed, the first chuck 3 is opened, and the work W The second spindle 2 is temporarily retracted until the end comes to the gripping position of the first chuck 3, at which position the first chuck 3 is closed and the second spindle 2 is closed.
The chuck 4 is opened, the second chuck 4 is advanced again to a position close to the first chuck 3, the second chuck 4 is closed and the first chuck 3 is opened, so that the workpiece is delivered to the second chuck. At the end of the delivery, the workpiece W is in a state of being deeply inserted into the hollow hole 2a of the second main shaft. Also the second
Since the advance / retreat position of the main shaft 2 is accurately controlled by the NC device, it is possible to grip the work at an accurate axial position.

The second spindle 2 holding the workpiece W returns to the original position. At this time, the piston 31 of the holding cylinder is urged in the forward direction, and the holding rod 32 is moved to the base end 2 of the contact body.
5a is pressed to open the gripping claws 25. Then, the second feed rod 29 is advanced by the air pressure of the air cylinder 41 to bring the contact surface 24 of the contact body 23 into contact with the front end of the work, and the feed rod 29 is further advanced, whereby the sleeve 27 is moved forward. The gripper 25 is closed to grip the tip of the work W (arrow in FIG. 2). Subsequently, the cylinder chamber 46 on the work side of the presser cylinder 30 is pressed with high-pressure air to press the piston 31 against the wall of the cylinder 30, thereby separating the presser rod 32 from the base end 25 a of the abutting body and the feed rod 29 and the piston. 31 is integrated. At this time, the engagement member 38 on the retreating side of the immobile member 40 is provided at a position facing the circumferential groove 33 of the flange. In this state, the engagement member 38 is advanced to engage with the engagement groove. The axial movement of the feed rod 29 is restricted. Therefore, if the second spindle 2 is rotated in this state to process the rear end of the work, the vibration of the work during the processing is suppressed, and further, the work is prevented from retreating due to the vibration and the reaction force.

When the machining of the rear end of the work is completed, the second work stopper 14 provided on the second turret 12 is advanced on the axis of the main shaft, the second chuck 4 is loosened, and the engagement member 3 on the retreating side is released.
After retracting the work 8, the work W is advanced by the air pressure of the air cylinder 41 until it comes into contact with the work stopper 14 (arrow in FIG. 2). The advancing side engaging body 39 is provided at a position where it engages with the engaging groove 33 at this advancing position, and by moving the engaging body 39 at this position, the axial position of the second feed rod 29 is changed. Be regulated. Therefore, the second chuck 4
, The second work stopper 14 is retracted, and the second main shaft 2 is rotated to process the intermediate portion of the work on the second main shaft side.

When the machining on the second spindle side is completed, the second feed rod 29 is retracted (arrow in FIG. 2) to move the workpiece W to the second position.
Pull out from the main shaft, advance the holding rod 32 to open the gripping claw 25, and further advance the knockout rod 44 to move the workpiece W
To the outside of the machine.

[0030]

As will be understood from the above description, according to the present invention, a workpiece feeder for feeding a workpiece in the axial direction is used, and the axial displacement due to the vibration of the bar material during processing and the reaction force of the processing. Since (retreat) is prevented, there is an effect that a bar material with high shape accuracy can be processed. Further, since there is no need to retract the feed rod of the feed device during machining, the operation of the work feed device is simplified, and the time required for the gripping operation involving the axial movement of the work is reduced.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view showing a work feeder on a first spindle side of a two-spindle opposed lathe of the present invention and its operation.

FIG. 2 is a schematic explanatory view showing a work feeder on a second spindle side of the two-spindle opposed lathe in FIG. 1 and its operation.

FIG. 3 is a detailed sectional view of a workpiece feeder on a second spindle side.

FIG. 4 is an explanatory view showing a work feeder on the first and second spindle sides of a conventional two-spindle opposed lathe and its operation.

[Explanation of symbols]

 16 Feed rod 18 Abutment body 20 Engagement groove 25 Gripping claw 30 Pressing cylinder 36 Engagement part 37 Immovable member 41 Air cylinder 45 Retraction device

Claims (4)

[Claims] 1. A work feeder for a lathe having a feed rod for feeding a bar material in a push-in or pull-out direction in an axial direction through a hollow hole provided in a main shaft of the lathe. An abutment member rotatably provided around the contact member, an uneven engagement element provided between the feed rod and an immovable member for guiding the axial movement thereof, and an immovable member provided on the immovable member side. A work feeder which also serves as a stopper for a lathe, comprising: a reciprocating device for reciprocating an engaging element on a member side. 2. A stopper for a lathe according to claim 1, wherein one of a concave or a convex of said engaging element is provided at a plurality of positions at predetermined intervals in a moving direction of said feed rod. Work feeder. 3. The contact member includes a gripping claw extending from the contact surface to the work side, and the feed rod includes an opening / closing mechanism for the gripping claw and a work protruding mechanism. Work feeder that also serves as a stopper for lathes. 4. A stopper-feeding work feeder according to claim 1 or 2, further comprising a first spindle and a second spindle which are provided with a spindle chuck at the opposite end and are opposed on the same axis. A two-spindle opposed lathe comprising the stopper / work feeder according to claim 3 on the second spindle side.