JPH05301103A - Chips ejecting device or lathe - Google Patents

Abstract

PURPOSE:To prevent chips from being accumulated on the bore processing part of a work, by piercingly forming a chips leading-out route inside a spindle and a chuck along the shaft center, and forming a chips leading-in route between the front end opening of the chips leading-out route and the bore processing part of the work. CONSTITUTION:When a work 4 is gripped by jaws 3 of a chuck 2 and the bore processing part 5 of the work 4 is bored with a boring tool 12, chips 15 are sent backward from the bore processing parts by means of fluid 13 injected from a fluid injection port 6, as indicated by the arrow 14. Then, the chips 15 are smoothly blown backward, straightly through a chips leading-in route 9, in the same direction as the discharging direction as indicated by the arrow 16, ejected to a chips collecting device 11 through a chips leading-out route 7, and collected there.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chip discharging device for a lathe.

[0002]

2. Description of the Related Art As a conventional technology of a chip discharging device for a lathe,
There is one shown in FIG. This is the lathe spindle 10
The chuck 102 is fixed to the front end of the chuck 1.
The fluid injection port 106 faces the inner diameter processing portion 105 of the workpiece 104 gripped by the No. 02 jaw 103 from the front side. According to such a configuration, when boring the inner diameter processing portion 105 of the work 104 with the boring tool 107, the fluid 10 such as air ejected from the fluid ejection port 106 is used.
8 allows the chips 109 to be sent to the rear side from the inner diameter processing portion 105.

In this prior art, the chips 109
Is discharged into the cutting chamber, and is discharged from the cutting chamber by a chip conveyor below the cutting chamber. That is,
The chuck end surface portion facing the inner diameter processing portion 105 is sealed with a cap 110, and the chips 109 sent out backward from the inner diameter processing portion 105 of the work 104 by the fluid 108 are temporarily capped as indicated by an arrow 111.
After hitting, the centrifugal force causes the feeding direction to be bent at a substantially right angle, passes the side of the jaw 103, and is radially discharged into the cutting chamber.

In this prior art, a hydraulic chuck is used, and by moving the wedge plunger 112 back and forth by the hydraulic pressure of a hydraulic cylinder (not shown), the wedge 103 guides the jaw 103 to the diameter of the chuck 102. The workpiece 104 is moved along the direction to grip and release the workpiece 104.

[0005]

In the above-mentioned prior art, the chips 109 sent backward from the inner diameter processing portion 105 of the work 104 once hit the cap 110, and then the sending direction is bent at a substantially right angle. Because
This becomes the resistance of the discharge, and the chips 109 are the inner diameter processing part 1
There was a stagnation in 05. Therefore, the following problems have occurred.

Since the chips 109 bite into the cutting edge 114 of the boring tool 107, the precision of the finished surface of the inner diameter machined portion 105 is reduced. In addition, since the chips 109 are often caught in and removed from the cutting edge 114, the cutting stress applied to the cutting edge 114 is frequently changed to damage the cutting edge 114, which shortens the useful life of the boring tool 107. Further, since the chips 109 which are red-heated by the cutting heat come into contact with the work 104 for a long time, the work 104 is thermally deformed during the processing, and the processing accuracy is reduced. Further, in order to avoid the above problems, the stagnation of the chips 109 in the inner diameter processing portion 105 is monitored, and at any time,
When performing the stagnation elimination process, it requires manpower and
Work efficiency is significantly reduced.

Furthermore, since the chips 109 pass through the sides of the jaws 103 and are discharged radially into the cutting chamber, the chips 109 accumulate on the upper side of the tool rest or the like in the cutting chamber, and the removal work is periodically performed. Maintenance is time-consuming because it is necessary.

According to the present invention, it is possible to smoothly discharge the chips sent out from the inner diameter processing portion of the work.
It is an object of the present invention to provide a chip discharging device for a lathe.

[0009]

As shown in FIG. 1 (A), a chuck 2 is fixed to a front end of a spindle 1 of a lathe, and an inner diameter machining portion 5 of a work 4 is held by a jaw 3 of the chuck 2. In the chip discharge device of the lathe, which is configured by facing the fluid injection port 6 from the front side thereof, it is characterized as follows.

As shown in FIG. 1 (A), a chip lead-out passage 7 is provided in the spindle 1 and the chuck 2 along the axial center thereof in a penetrating manner, and a front end opening 8 of the chip lead-out passage 7 is formed. A chip introduction path 9 was provided between the chip 4 and the inner diameter processing part 5 of the work 4, and a chip collecting device 11 was connected to the rear end opening 10 of the chip discharge path 7 as illustrated in FIG.

[0011]

As shown in FIG. 1 (A), when the work 4 is gripped by the jaw 3 of the chuck 2 and the inner diameter processing portion 5 of the work 4 is boring-processed by the boring tool 12, the fluid is ejected from the fluid ejection port 6. Due to the fluid 13, the inner diameter processing part 5 is
When the chips 15 are sent to the rear side from the
2 is smoothly discharged straight rearward through the chip introduction path 9 and discharged to the chip collection device 11 shown in FIG. And collected here.

[0012]

According to the present invention, the chips fed backward from the inner diameter machining portion of the workpiece are smoothly discharged straight rearward through the chip introduction path in the same feeding direction as described above. Slag stagnation in parts is avoided. Therefore, there are the following advantages.

Since the chips are prevented from being caught in the cutting edge of the boring tool, the precision of the finished surface of the inner diameter machined portion is good.
Further, since the chips are prevented from being caught in the cutting edge, the frequency of variation of cutting stress applied to the cutting edge is reduced, damage to the cutting edge is reduced, and the useful life of the boring tool is maintained for a long time. Also, since the chips that are red-heated by the cutting heat do not contact the work for a long time, the thermal deformation during machining of the work is reduced,
Its processing accuracy is good. Further, since it is not necessary to monitor the stagnation of chips in the inner diameter processing part and to eliminate the stagnation, it is possible to automate and unmanner the work, and the work efficiency is high.

Further, since the chips discharged from the inner diameter processing section are collected in the chip collecting device without passing through the cutting chamber, the chips are not accumulated on the upper side of the tool rest or the like in the cutting chamber. The maintenance work can be saved because the removal work is not required.

[0015]

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1A is a vertical cross-sectional side view near the front end of a spindle of a lathe according to an embodiment of the present invention, and FIG. 1B is a front view of a boring tool attached to a tool holder. 2 is shown in FIG.
It is a longitudinal cross-sectional side view near the rear end part of the spindle of (A). FIG. 3 is an overall explanatory view of a lathe according to an embodiment of the present invention.

The structure of the lathe shown in FIG. 3 is as follows.
The spindle 1 is installed in each of the left and right sides of the lathe body 54.
Is accommodated, each spindle 1 is rotatably supported by a bearing portion 55, and is rotationally driven by a drive source (not shown).
A cutting chamber 56 is provided in the center of the lathe main body 54, and the chuck 2 fixed to the tip of each spindle 1 faces the cutting chamber 56. A tool rest 57 is arranged near each chuck 2. The front side of the cutting chamber 56 is covered with a door 58.

As shown in FIG. 1 (A), the chuck 2 is
Spindle nose 17 formed on the front end of the spindle 1
It is fixed via the chuck adapter 18. Then, a pilot bushing 19 is fitted in the front portion of the axial center of the chuck 2 and fixed to the chuck 2.
Then, a through hole 20 is provided in the spindle 1 and the chuck 2 along the axial direction thereof, and a draw tube 21 is inserted therethrough so as to be movable back and forth. A wedge plunger 22 is externally fitted and fixed near the front end portion of the draw tube 21, and a base end portion 24 of the jaw 3 is fitted into a wedge-shaped guide groove 23 thereof. Further, the tip opening 25 of the draw tube 21 is fitted into the pilot bushing 19 so as to be movable back and forth, and the wedge plunger 22 is fitted to the pilot bushing 19 so as to be movable back and forth.

Further, as shown in FIG. 2, a rotary cylinder 27 is fixed to the rear end of the spindle 1 via a cylinder adapter 26, and the draw tube 21 is inserted into the rotary cylinder 27 to rotate the rotary cylinder 27. Body 29 that is interlocked in the front-back direction by hydraulic pressure in the hydraulic chamber 28 of
Is externally fitted and fixed to the draw tube 21. In addition, a distributor (not shown) is provided on the rear portion 30 of the rotary cylinder 27.
Is incorporated into the hydraulic chamber 28 of the rotary cylinder 27 from a hydraulic source (not shown) via a distributor. In the figure, 59 is a coolant collector.

According to the above-mentioned structure, when the piston body 29 in the rotary cylinder 27 shown in FIG. 2 is linked to the rear side by the hydraulic pressure of the hydraulic oil, the wedge shown in FIG. The plunger 22 moves to the rear side, and the wedge-shaped guide groove 23 moves the jaw 3 inward along the radial direction of the chuck 2, thereby gripping the work 4. Further, when the piston body 29 shown in FIG. 2 is interlocked with the front side, the piston tube 29 shown in FIG.
The wedge plunger 22 shown in (A) moves to the front side,
The wedge-shaped guide groove 23 moves the jaw 3 outward along the radial direction of the chuck 2, whereby the work 4 is released.

Further, a tool rest 57 provided so as to be movable relative to the work 4 in the spindle axis direction and the axis orthogonal direction.
The boring tool 12 is attached to the workpiece 4 via a tool holder 31 (see FIG. 3). The boring tool 12 is inserted into the tool insertion hole 32 of the tool holder 31 and fixed with a fixing bolt 33. And FIG.
As shown in (A) and (B), six cutting oil guide grooves 34 are formed in the inner peripheral surface of the bite insertion hole 32 along the insertion direction, and the starting end portion of the tool holder 31 is A workpiece 4 that communicates with a cutting oil inlet 36 opened in the end portion 35 and releases the end portion as a cutting oil jet 37 toward the front side, and the cutting oil jet 37 is gripped by the jaw 3 of the chuck 2. The inner diameter processing part 5 is exposed from the front side. The cutting oil inlet 36 communicates with a cutting oil pressure source (not shown) via a cutting oil pressure pipe (not shown). As shown in FIG. 1 (B), one of the cutting oil injection ports 37 is directed to the vicinity of the cutting edge 38 of the boring tool 12, and the other is directed to a position away from the cutting tool 38, both of which are boring tools. It is formed around 12.

According to this structure, when the inner diameter machined portion 5 of the work 4 is bored by the boring tool 12, the inside of the inner diameter machined portion 5 is cut by the high pressure cutting oil 51 injected from the cutting oil injection port 37. The peripheral surface and the cutting edge 38 of the boring tool 12 can be lubricated and cooled, and the chips 15 of the inner diameter machining portion 5
Can be sent to the rear side as indicated by arrow 14.

This lathe has been devised as follows in order to smoothly discharge the chips 15 sent from the inner diameter processing section 5. A liner tube 39 is fitted in a draw tube 21 that is inserted through the spindle 1 and the chuck 2 in series, and the inside of the liner tube 39 is used as a chip discharge passage 7. Then, the chip introducing cylinder 53 is detachably fixed to the pilot bushing 19, and the inside of the chip introducing cylinder 53 is used as the chip introducing passage 9. Then, the front end portion 40 of the liner tube 39 is attached to the chip introduction tube 5
3 so as to be movable back and forth, and the front end opening edge 41 of the chip introduction tube 53 is brought into close contact with the rear surface 42 of the cylindrical work 4, whereby the front end opening 8 of the chip discharge passage 7 and the work. A chip introducing passage 9 is provided between the inner diameter processing portion 5 and the inner diameter processing portion 5.
The chip introduction tube 53 can be replaced according to the shape and size of the work 4, and the front end opening edge 41 of the chip introduction tube 53 is always in contact with the rear surface 42 of the work 4 in a close contact state. ..

A chip collecting device 11 is connected to the rear end opening 10 of the chip lead-out passage 7 shown in FIG. Figure 3
As shown in, the chip collecting device 11 is arranged outside the lathe body 54. As shown in FIG. 2, the chip collecting device 11
Forms a chip capturing space 44 in the collecting case 43,
The rear end opening 10 of the chip discharge passage 7 is faced here, a filter medium 45 made of punching metal is provided below the chip capturing space 44, and a cutting oil recovery tank 46 is provided below the filter medium 45. .. The liner tube 39 is removably inserted through the rear end opening 47 of the draw tube 21, and the rear end flange portion 48 of the liner tube 39 is applied to the rear end stepped portion 49 of the draw tube 21 from the rear side to draw the liner tube 39. The locking ring 50 is fitted into the rear end opening 47 of the tube 21 by screw fitting, and the locking ring 50 and the draw tube 21 are
The rear end flange portion 48 of the liner tube 39 is sandwiched between the rear end stepped portion 49 and the rear end stepped portion 49 to prevent the liner tube 39 from coming off.

According to this structure, as shown in FIG. 1 (A), the work 3 is held by the jaws 3 of the chuck 2,
When boring the inner diameter machined part 5 of the work 4 with the boring tool 12, the cutting oil 51 injected from the cutting oil injection port 37 causes chips 15 from the inner diameter machined part 5 as indicated by an arrow 14.
Is sent to the rear side, the chips 15 are smoothly discharged straight rearward through the chip introduction path 9 and the chip discharge path 7 in the same direction as shown by the arrow 16. As shown in FIG. 2, the chips 15 are discharged from the rear end opening 10 of the chip discharge passage 7 into the chip capturing space 44 by a centrifugal force as shown by an arrow 52, the chips 15 are accumulated on the filter medium 45, and the cutting oil is supplied. 51 is collected in the cutting oil recovery tank 46.
When the inside of the liner tube 39 is abraded by the chips 9, the liner tube 39 is replaced with a new one.

The contents of the embodiments of the present invention are as described above, but the present invention is not limited to the above embodiments. For example, the liner tube 3 fitted inside the draw tube 21
9 is omitted and the inside of the draw tube 21 is provided with the chip discharge passage 7
You may use as. Further, in the structure having no draw tube 21, the chip lead-out passage 7 may be provided directly in the spindle 1. Further, the chip introduction cylinder 53 may be formed integrally with the chuck 2. The chips 15 may be sent out from the inner diameter processing portion 5 by jetting air.

[Brief description of drawings]

FIG. 1A is a vertical cross-sectional side view near the front end of a spindle of a lathe according to an embodiment of the present invention, and FIG. 1B is a front view of a boring tool attached to a tool holder.

FIG. 2 is a vertical cross-sectional side view near the rear end of the spindle shown in FIG.

FIG. 3 is an overall explanatory view of a lathe according to an embodiment of the present invention.

FIG. 4 is a view corresponding to FIG. 1 of the prior art.

[Explanation of symbols]

1 ... spindle, 2 ... chuck, 3 ... 2 jaws, 4 ...
Workpieces, 5 ... 4 inner diameter machining portion, 6 ... Fluid ejection port, 7 ... Chip discharge passage, 8 ... 7 front end opening, 9 ... Chip introduction passage, 10 ... 7 rear end opening, 11 ... Cutting Waste collection device.

Claims (1)

[Claims] 1. A chuck is provided at a front end of a lathe spindle (1).
(2) is fixed and the fluid injection port (6) is made to face from the front side to the inner diameter processing part (5) of the work (4) grasped by the jaw (3) of this chuck (2). In the chip discharging device, a chip lead-out passage (7) along the axis of the spindle (1) and the chuck (2) is provided in a penetrating manner, and a front end opening (8) of the chip lead-out passage (7) is provided. ) And the inner diameter machining portion (5) of the work (4), and a chip introduction path (9) is provided, and a chip collecting device (10) is provided at the rear end opening (10) of the chip discharge path (7). 11)
A chip discharge device for lathes, characterized in that