JPH03184702A - Bar stock working device - Google Patents

Abstract

PURPOSE:To improve productivity and to prevent the waste of a bar by preventing the vibration of the bar stock with the approach of the inner diameter of the insertion hole of the spindle of a bar processing device to the diameter of the bar stock and making a finger chuck which holds the bar intrudable into the spindle. CONSTITUTION:A finger chuck 12 of a bar working device is equipped with plural finger pieces 24 and on a spindle 15 a recessed bar received to the finger piece 24 and a projecting bar engaged with the finger piece 24 are provided inside an insertion hole 14, when the finger chuck 12 is inserted into the insertion hole 14. When the chuck 12 is inserted into the insertion hole 14 of the spindle 15, the finger piece 24 comes into the recessed bar of the insertion hole 14 inside. Also, the projection bar is engaged with the space between the finger pieces 24. So, the finger piece 24 becomes movable into the spindle 15 along the recessed bar by holding the rear end of a bar stock 11. Consequently, the bar stock 11 can be fed into the spindle 15 from the front end up to the rear end. Also, the vibration of the bar stock 11 is difficult to cause because of the projection bar approaching to the peripheral face of the ball stock 11.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a bar processing device that performs processing such as cutting while feeding a long bar toward a main shaft portion.

[Conventional technology]

A bar processing device that performs machining such as turning on a long bar includes a bar supply section that grips the rear end of the bar with a finger chuck and feeds the bar in one direction, and a bar supply unit that feeds the bar in one direction, and a bar supply unit that feeds the bar in one direction. The main shaft of a lathe or the like has an insertion hole through which the rod can pass, and the main shaft holds the bar while machining it with a cutter such as a cutting tool.

In FIG. 8, reference numeral 1 indicates a feed pipe of a bar supply section, and a finger chuck 2 is attached to the front end of the feed pipe. The rear end of the feed pipe 1 is connected to a drive chain (not shown).

By driving this drive chain, the bar 3 is conveyed in one direction while being gripped by the finger chuck 2.

Further, reference numeral 4 indicates a main shaft portion of the lathe, and a main shaft chuck 6 is provided at the end of the insertion hole 5 of the bar 3. This insertion hole is formed to have a diameter larger than the diameter of the bar 3 so that the finger chuck 2 can be received therein.

Further, reference numeral 7 denotes a steadying part that prevents the bar 3 from swinging, and a plurality of the steadying parts 7 are installed along the axial direction of the bar 3.

To process a bar 3 using such a bar processing machine, the finger chuck 2 grips the rear end of the bar 3, and the drive chain drives the bar 3 toward the main shaft 4 by a fixed length. supply When the main shaft part 4 receives a predetermined length of the bar material 3, it fixes the bar material 3 with the main shaft chuck 6, rotates the bar material 3 together with the finger chuck 2, and uses a cutter such as a cutting tool to remove the bar material 3. Perform processing. At this time, the steadying part 7 supports the middle part of the bar 3 and prevents it from swinging around.

In another conventional example shown in FIG. 9, the rear end of the bar 3 is
As shown in FIG. 0, a gripping portion 8 is provided by step processing, and a finger chuck 9 grips the gripping portion 8. A bar 3 is provided on the inner peripheral surface of the insertion hole 5 of the main shaft portion 4.
A bushing 10 having an inner diameter slightly larger than the diameter of the bushing 10 is fitted. A finger chuck 9 having approximately the same diameter as the bar 3 can be inserted into the bush 10.

[Problem to be solved by the invention]

However, in the case of the bar material processing machine shown in FIG.
The diameter must be set to a size that allows the finger chuck 2 to pass through.

For this reason, vibrations are likely to occur in the bar 3 within the main shaft portion 4, and an upper limit must be placed on the number of rotations in order to prevent vibrations. Normally, the speed is 3000 rpm or less.

Furthermore, in the case of the bar processing machine shown in FIG. 9, the inner diameter of the insertion hole 5 of the main shaft portion 4 can be approximately 0.3 to 1 mm greater than the diameter of the bar 3, so that the rotation speed can be increased. However, as described above, the rear end of the bar 3 must be stepped to form the gripping part 8, which is troublesome and has the drawback of increasing loss of material.

Therefore, the present invention makes it possible to prevent vibration of the bar by making the inner diameter of the insertion hole of the main shaft part as close to the diameter of the bar as possible.
It is an object of the present invention to provide a bar processing machine that can allow a finger chuck holding a bar that is not subjected to step processing to enter into the main shaft portion.

[Means to solve the problem]

In order to solve the above problems, the present invention provides a bar supply section that feeds the bar in one direction by gripping the rear end of the bar with a finger chuck, and an insertion hole through which the finger chuck can pass together with the bar. In the bar processing apparatus, the finger chuck includes a plurality of finger pieces spaced apart in the circumferential direction, and the main shaft part inserts the bar into the insertion hole with the fingers. The insertion hole includes a concave line extending in the axial direction of the main shaft portion that receives the finger chuck held by the finger chuck when the finger chuck is inserted, and a convex line that engages in the space between the finger pieces. is adopted.

[Effect]

When the finger chuck is inserted into the insertion hole of the main shaft, the finger pieces enter the grooves in the insertion hole of the main shaft. Furthermore, the protrusions engage within the spaces between the finger pieces. Therefore, the finger piece can grip the rear end of the bar and move within the main shaft portion along the groove. Therefore, the bar can be fed into the main shaft portion from its front end to its rear end.

Further, the protruding strip within the insertion hole of the main shaft portion is close to the circumferential surface of the bar. Therefore, it is difficult to generate vibrations in the bar material, and the main shaft portion can be rotated at high speed.

〔Example〕

Embodiments of the bar processing apparatus according to the present invention will be described below.

As shown in FIGS. 6 and 7, the bar processing device is
a bar supply section 13 that grips the rear end of the bar 11 with a finger chuck 12 and feeds the bar 11 in one direction;
1 and a main shaft portion 15 having an insertion hole 14 through which the finger chuck 12 can pass.

The bar supply section 13 has a frame 16, and an operation panel 17 is provided in front of this frame L6, and a keyboard 1-8 is provided in a part of this operation panel 17. A control box 19 is disposed on the lower surface of the frame 16, and the bar feed state of the bar supply section 13 is controlled by this control box E9.

The bar feeder 13 has a horizontally held bar 11 therein.
The aforementioned finger chuck 12 is used to hold the rear end of the
It is equipped with

The finger chuck 12 is connected to a drive chain 22 via a feed pipe 20 and a slider 21.

As shown in FIGS. 1 to 5, the finger chuck 12 has three finger pieces that protrude from the tip of a base 23 to be connected to the tip of the feed pipe 20 toward the tip of the finger chuck 12. It is equipped with 24.

The base 23 is connected to the feed pipe 20 by using its annular shape A25, etc., and together with the feed pipe 20, it is made to have a diameter that is approximately equal to or slightly smaller than the diameter of the bar 11. There is.

The three finger pieces 24 are arranged at intervals of 120 degrees in the circumferential direction of the finger chuck 12, and the inner diameter of the cavity 26 formed by the bundle is set to be slightly smaller than the diameter of the bar 11.

As a result, the rear end of the bar 11 is inserted into the cavity 26 formed by the bundle of finger pieces 24, as shown in FIGS. The rear end of the material 11 will be firmly grasped.

Note that the distal end portion 24a of the finger piece 24 is desirably formed into a substantially triangular pointed shape so that the finger piece 24 can be smoothly inserted into the insertion hole (4) described below.

A driving chino 22 for operating the finger chuck 12 is wound around a driving pulley 27a at the front thereof, and wound around a driven pulley 27b at the rear thereof. Furthermore, the drive chain 22 has a guide pulley 27c.
, 27d.

The driven pulley 27b is connected to a top cut brake 28, and the driving pulley 27a is connected to a rotary encoder 30 via a shaft 29, on which an intermediate pulley 31 is fixed.

This intermediate pulley 31 is connected via a chain 32 to an intermediate pulley 33 provided below, and this intermediate pulley 33 connects to a half piece 35 of a slip clutch 35 via a shaft 34.
The other half piece 35 connected to a and facing this half piece 35a
b is fixed to a shaft 36, and an intermediate pulley 37 is fixed to the other end of this shaft 36, and this intermediate pulley 37 is connected to a chain 38.
It is connected to the main drive pulley 39 via. This main drive pulley 39 is connected to the drive motor 4, which is a geared motor.
0, and the driving force of the drive motor 40 is transmitted to the drive chain 22 via the slip clutch 35, whereby the bars 11 are sequentially fed into the main shaft portion 15 according to a program.

Note that an original position limit switch 41 for regulating the starting position of the feed pipe 20 is provided near the top cut brake 28. The slip clutch 35 is a powder clutch, and this powder clutch transmits the driving force of the drive motor 40 to the drive chain 22, stops the transmission, and also controls when the torque of the drive motor 40 exceeds a certain level. When this happens, the two halves 35a and 35b are caused to slip so that torque exceeding a certain level is not transmitted to the drive chain 22.

Inside the control box 19 is an input device 4 for receiving pulses generated by the rotary encoder 30.
2, a controller 43 is provided for receiving a pulse signal from the input device 42 and controlling the slip clutch 35, the drive motor 40, and the cutlery described later based on the pulse signal. The control signal is transmitted to the cutter via the output device f144 and also to the drive motor 40 via the inverter 45. This inverter 45 is used to vary the rotational speed of the drive motor 40 in accordance with the feed state of the bar 11 based on a signal from the controller 43. A program for feeding the bar 11 to the lathe is input to the controller 43 via the keyboard 18.

Inside the frame 16, a steadying portion 46 is provided with a long bar 1.
1 are arranged in a straight line. Each steady stop part 46 is connected to a bar 1 installed in the bar supply part 13.
1, which are held by a frame member, and the frame member can be opened and closed.

The main shaft part 15 is the main shaft part of a lathe in this case.

This lathe has the bar supply section 13 as shown in FIG.
It is located adjacent to.

This main shaft portion 15 has an insertion hole 14 through which the bar 11 is to pass.
A spindle chuck 47 for gripping the bar 11 is provided at one end.

Further, as shown in FIG. 7, in front of the spindle chuck 47, there is a stopper 48 for regulating the stopping position of the bar material 11 to be processed, and a cutter 49 such as a cutting tool for cutting the bar material 11. is provided.

As shown in FIGS. 1 and 3, when the finger chuck holding the bar 11 with the finger pieces 24 is inserted into the insertion hole 14 of the main shaft portion 15, the finger chuck is inserted into the insertion hole 4. There are provided three grooves 50 extending in the axial direction of the main shaft portion 15 for receiving the finger pieces, and three protrusions 51 engaging in the spaces between the finger pieces 24.

Specifically, the protrusions 51 are fixed in the thin cylinder 52 at intervals of 120 degrees in the circumferential direction of the cylinder 52 and along the generatrix of the cylinder 52, and the cylinder 52 is fixed to the insertion hole 14 in the main shaft portion 15. By fitting into the inner peripheral surface of the convex line 51 and the concave line 50
will be established. In addition, three protrusions 51
The top of the bar 11 is an arcuate surface, and the curved surface formed by the whole is part of a cylindrical surface having a diameter slightly larger than the diameter of the bar 11. Furthermore, the bottoms of the three grooves 50 are also circular arc surfaces,
The curved surface formed by the whole, that is, the inner circumferential surface of the cylinder 52 is a part of a cylindrical surface having a diameter slightly larger than the outer diameter of the bundle of finger pieces 24 holding the bar 11.

Next, the operation of the bar processing apparatus of the present invention will be explained.

Initially, the feed pipe 20 is retreated to the state where the slider 21 is in contact with the original position limit switch 41, and in this state, the long bar 11 is pulled from the shelf (not shown) in front of the finger chuck 12 of the feed pipe 20. sent to. In this state, the drive motor 40 starts rotating.

On the other hand, clutch 35 is open. When the bar 11 is fed to the front of the feed pipe 20, the clutch 35 is connected in response to a command from the controller 43, and the feed pipe 20 moves forward slightly to grip the rear end of the bar 11 with its fingers 24.

Thereafter, the feed pipe 20 is intermittently advanced by a predetermined length by the drive of the drive chain 22, and the tip of the bar 11 is pressed against the stopper 48.

Next, when the main shaft chuck 47 and the roller group of the steady stop part 46 restrain the bar 11, the main shaft part 15 is started and the bar 1 is
Rotate 1. Then, the cutter 49 processes the tip of the bar 11. At this time, since the bar 11 is surrounded by the protrusions 51 within the insertion hole 14 of the main shaft portion 15, almost no vibration occurs even when the bar 11 rotates at high speed.

When the machining of the tip of the bar 11 is completed in this way, the bar 11 is released from being restrained by the spindle chuck 15, and the bar 11 is fed until it abuts the stopper 48, chucked again, and then cut. Processing etc. are performed.

When such processing is repeated and the bar 11 becomes shorter,
The finger piece 24 enters the groove 50 in the insertion hole 14 and moves inside the insertion hole 14 while being guided by the groove 50 into the spindle chuck 47.
The main shaft chuck 4 moves the bar 11 to its end.
Send it to 7.

Note that when the finger piece 24 enters the insertion hole 14, since the tip end 24a of the finger piece 24 is sharp, it smoothly enters the groove 5o.

In this way, the bar 11 is intermittently moved a predetermined number of times and for a predetermined length.
is fed into the insertion hole 14, and when the predetermined processing is completed over almost the entire length of the bar 11, the feed pipe 20
moves back to the original position at high speed accompanied by the finger chuck 12.

Note that at the beginning of processing, a process called top cut is performed to slightly cut the tip of the bar material 11, but during this top cut process, the feed pipe 2
0 is stopped by the action of the top cut brake 28.

In the present invention, three finger pieces 24, three convex lines 51, and three concave lines 50 are provided, but the number may be two or four or more.

The cylinder 52 and the protruding strip 51 may be integrally molded from the beginning. Alternatively, the cylinder 52 may be omitted and the protrusions may be formed directly within the insertion hole 14 of the main shaft portion 15. Further, the protrusion 51 may be fixed in the insertion hole 14 together with the cylinder 52, may be loosely fitted, may be formed over the entire length of the insertion hole 14, or may be provided locally. Good too.

〔Effect of the invention〕

Since the present invention has the above configuration, it is possible to prevent vibration of the bar by making the inner diameter of the insertion hole of the main shaft part as close to the diameter of the bar as possible. Therefore, it is possible to increase the rotation speed of the main shaft portion and improve production efficiency. Further, since it allows entry into the main shaft of a finger chuck that grips a normal bar, there is no need to perform step processing on the rear end of the bar to reduce the diameter of the finger chuck. Therefore,
The conventional troublesome step processing can be omitted, and the waste of bar material can be prevented.

[Brief explanation of drawings]

1 to 7 show an embodiment of the present invention, FIG. 1 is a partially cutaway schematic side view of the finger chuck and the vicinity of the main shaft, FIG. 2 is a sectional view taken along the line ■-■ in FIG. Figure 3 is the first
4 is a half-sectional view of the finger chuck, FIG. 5 is a front view of the finger chuck, FIG. 6 is a side view of the entire bar processing device, and FIG. 7 is a bar material processing device. A schematic perspective view of the entire processing device, FIGS. 8 to 10 show a conventional example, FIG. 8 is a side view similar to FIG. 1, and FIG. 9 is a side view of another conventional example, and FIG. 1O. FIG. 2 is a side view of the rear end of a bar that has been subjected to step processing. 11... Bar material, (2... Finger chuck, 13
... Bar supply part, 14 ... Insertion hole, 15 ... Main shaft part, 22 ... Drive chain, 23 ... Base, 24 ...
...Finger piece, 24a...Tip, 26...Cavity, 40...Drive motor 47...Spindle chuck, 4
9...Knife, 50...Concave line, 51...Convex line.

Claims (1)

[Claims] A bar material comprising: a bar supply section that feeds the bar material in one direction by gripping the rear end of the bar material with a finger chuck; and a main shaft portion for a lathe or the like having an insertion hole through which the finger chuck can pass together with the bar material. In the processing device, the finger chuck includes a plurality of finger pieces spaced apart in the circumferential direction, and the main shaft portion is configured to have a plurality of finger pieces when the finger chuck holding the bar material with the finger pieces is inserted into the insertion hole. A bar processing device characterized in that the insertion hole is provided with a concave line extending in the axial direction of the main shaft portion that receives the finger piece, and a convex line that engages in the space between the finger pieces.