JPS62140737A - Cleaning device for tool holder holding part for machine tools - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention A8 Objective of the Invention +11 Industrial Field of Application The present invention is directed to a tool holder holding part for a machine tool, particularly a tool holder holding part in a hollow part of a spindle that holds a tool holder at its tip, for tool exchange. The present invention relates to a cleaning device for a tool holder holder for a machine tool, which is sometimes cleaned using pressurized air.

(2) Conventional technology A machine tool in which a tool holder is held at the tip of the spindle and the tool is replaced by attaching and detaching the tool holder to the spindle is disclosed in Japanese Patent Laid-Open No. 52-1229.
This is known from the prior art as seen in Japanese Patent No. 76.

(3) Problems to be Solved by the Invention The tool holder, at the tip of the spindle, engages with the tip of a drawbar that extends in the axial direction within the hollow part of the spindle. When detaching from the spindle, the proximal end surface of the drawbar is pressed by a push rod and the drawbar is moved toward the distal end of the spindle against the biasing force of the spring, thereby changing the engagement relationship between the drawbar and the tool holder. Unraveling allows the tool holder to be removed from the spindle tip.

By the way, the tool holder needs to be held accurately and reliably in the hollow part at the tip of the spindle, but when changing tools, dust or chips may get in between the contact surfaces between the tool holder and the spindle. It becomes difficult to reliably hold the tool holder in the tool holder holding portion of the spindle in an accurate posture. Therefore, it is possible to clean the tool holder holding part of the spindle by blowing high pressure air on it when changing tools, but high pressure air blowing complicates the structure of the tool drive unit if the equipment is specially arranged. This is undesirable.

In view of the above points, the present invention provides cleaning of a tool holder holder for a machine tool, which allows the tool holder holder of a spindle to be reliably cleaned during tool exchange without complicating the structure of the tool drive unit. The main purpose is to obtain equipment.

B0 Structure of the Invention (1) Means for Solving the Problems According to the present invention, a spring extends in the axial direction within the hollow portion of the spindle that holds the tool holder at the distal end, and extends toward the proximal end of the spindle. A pressurized air introduction hole is formed axially through the drawbar that engages with the tool holder by a biasing force, and by pressing the proximal end surface of the drawbar against the spring biasing force, the drawbar is engaged with the tool holder. 〇 At the tip of the push rod that disengages from the tool holder, pressurized air from the pressurized air source is introduced into the pressurized air introduction hole of the drawbar while the push rod presses the proximal end surface of the drawbar. A cleaning device for a tool holder holder for a machine tool, in which a feeding channel is open, is obtained.

(2) Effect When exchanging tools, when the push rod moves toward the tip side and presses the base end surface of the drawbar against the spring biasing force, the drawbar moves toward the tip side and the drawbar and tool holder are connected. Since the engagement is disengaged, the tool holder can be removed from the tip of the spindle. In this state, when pressurized air sent from the pressurized air source is sent from the flow path of the push rod to the pressurized air introduction hole of the drawbar that is aligned with this flow path, the pressurized air is ejected from the opening at the tip of the drawbar. The tool holder holding part of the spindle
Clean the obi. As a result, the contact surface of the spindle with the tool holder is completely free of dust, chips, and other undesirable objects, ensuring that new tools are accurately positioned and securely seated in the spindle's tool holder holder. can do.

(3) Examples An embodiment of the present invention will be described below with reference to the drawings.

First, in FIGS. 1 and 2, a horizontally moving table 3 is mounted on a bed 1 of a machine tool and is moved horizontally by a feed motor 2.
Mounted on the top is a back-and-forth moving table 7 that is moved back and forth along a pair of guide rails 5 and 6 by a feed motor 4.

A column 8 is erected on this longitudinally moving table 7, and an elevating frame 11 of the tool drive unit A, which is raised and lowered by a feed screw 10 rotationally driven by a feed motor 9, is vertically mounted on the front side of the column. It is raised and lowered relative to the column 8 along a pair of left and right guide rails 12 and 13 extending in the column 8. A leaning tower type turret head 17 is supported on the front side of the elevating frame 11 and is rotated around an axis in a direction inclined with respect to the front-rear direction in a horizontal plane. 16.6
6 is formed. The central axes of each spindle head 16.66 are twisted to each other as shown in FIG. 1 to avoid mutual interference of the internal mechanisms of the tool drive unit 1-A, and as shown in FIG. During the cutting operation using the tool, the central axis of the spindle head faces in the front-back direction with respect to the column 8, and when changing the tool, the central axis of the spindle head faces in the left-right direction with respect to the column 8 as the turret head 17 rotates. .

In FIG. 2, spindle head 16 is in the cutting position and spindle head 66 is in the tool change position. Further, as shown in FIG. 2, the guide rail 13 is disposed in front of the guide rail 12, and each guide rail 12.
The distances from 13 to turret head 17 are both short.

In FIG. 3, the outer circumferential side of the cylindrical connecting part 18 of the turret head 17 is rotatably supported on the inner circumferential side of the cylindrical support part 14 of the lifting frame 11 via a bearing 15. The opposing surfaces of the outer circumferential flange llf of the lifting frame 11 and the outer circumferential flange 17f of the turret head 17 are configured to be freely cold-welded to each other. and each outer peripheral flange 11''.

The back side of 17f is formed as a tapered surface 11t, 17t, respectively, and these pair of outer peripheral flanges llf,
The outer surface of 17f is surrounded by an annular clamp 19 for restraining the turret head 17 from pivoting as required.

A gear 20 is integrally fixed to the end surface side of the cylindrical connecting part 18, and a talent turning moke 21 mounted on the elevating frame 11 is attached to the gear 20, so that a gear 20 is attached to the output shaft of the motor 21. The bevel gear 23 has bearings 2.4 on the cylindrical support 14.
A bevel gear 27 on one end side of the gear shaft 26 pivotally supported by the gear shaft 25
A gear 28 at the other end of the gear shaft 26 is rotationally driven through the gear shaft 26.
are interlocking.

The rotational driving force of the tool rotation motor 29 mounted on the lifting frame 11 is transmitted by an output shaft 30 and a bearing 31 by the lifting frame 11.
．． 32, a gear 34 on a gear shaft 33 rotatably supported by a gear shaft 32, a gear 38 on a gear shaft 37 rotatably supported by an elevator frame 11 via bearings 35, 36, and a gear 38 on a gear shaft 37 rotatably supported by an elevator frame 11. The signal is transmitted to the spline 43 on the outer circumferential surface of the forward protrusion of the gear shaft 41 via the gear 42 on the gear shaft 41 which is rotatably supported via bearings 39 and 40.

The spline 43 has a drive side engagement member 4 of the clutch 44.
The spline on the inner peripheral surface of 4a is engaged. The drive-side engagement member 44a has a cylindrical shape as a whole, and has an engagement portion on its front edge that engages with the driven-side engagement member 44b, and has an engagement portion on its outer peripheral surface near the rear end. A clutch operation wheel 45 having an annular groove 46 formed on the outer peripheral surface side is fixed.

A proximal end of a rod 47 that protrudes forward in parallel with the spline 43 is fixed to the elevating frame 11, and a fixed piston 48 formed in the center of the rod 47 has a
A clutch operation cylinder 49 is fitted. Both end walls of the clutch operating cylinder 49 can be cold-welded along the outer circumferential surface of the rod 47, and the clutch operating pawl 50 fixed on the outer circumferential surface near the rear end of the clutch operating cylinder 49 fits in the annular groove of the clutch operating wheel 45. 46. As shown in FIG. 4, a base end portion of a cold welding member 73 that protrudes in a direction perpendicular to the axial direction of the clutch operation cylinder 49 is fixed on the upper surface of the rear end portion of the clutch operation cylinder 49. The cold welding member 73 is freely cold welded into a guide rail 74 which is parallel to the rod 47 whose base end is fixed on the lifting frame 11 and has a stomper nut 75 screwed to its tip end. ing. The cold welding member 73 (FIG. 4) slides along this guide rail 74, so that the clutch operation cylinder 4
9 slides along the rod 47 while always maintaining a constant orientation. When the pressure fluid is conducted to the pressure fluid path 51 in the rod 47, the clutch operation cylinder 49 is moved back and the clutch 44 is disengaged, and when the pressure fluid is conducted to the pressure fluid path 52 in the rod 47, , the clutch operation cylinder 49 moves forward and the clutch 7ch 44 becomes engaged.

In FIG. 3, the inner circumference 17 of the spindle head 16 is
A hollow spindle 55 is rotatably supported via a bearing 53 and a bearing group 54, and an annular driven-side engagement member 44b constituting the clutch 44 is fixed on the outer peripheral surface of the rear end of the hollow spindle 55. has been done. Therefore, when the clutch 44 is in the engaged state, the rotational driving force on the spline 43 side is transmitted to the hollow spindle 55 via the clutch 44.

A tapered surface 55t that expands toward the front is formed on the inner circumferential surface side of the front end of the hollow spindle 55, and a tapered surface 57L formed on the outer circumference of the tool holder 57 is in close contact with this tapered surface 55t. It is supposed to be done. When the tool holder 57 is fitted into the tapered surface 55 , the rotational driving force of the hollow spindle 55 is applied to the engagement pin 56 fixed to the front end of the hollow spindle 55 on the outer peripheral surface side of the front end of the tool holder 57 . The tool holder 57 is engaged with the engagement recess formed in the tool holder 57 via the engagement pin 56.
transmitted to.

A tool holder shaft 58 having an enlarged portion at the rear end protrudes rearward from the rear end surface of the tool holder 57, and this tool holder shaft 58 extends in the axial direction within the hollow portion of the hollow spindle 55. It is adapted to fit into a cylindrical portion 60 formed at the front end of the drawbar 59. Cylindrical part 60
A plurality of, for example three, ball holding holes penetrating in the radial direction are formed at intervals in the circumferential direction, and a ball 61 is held in each ball holding hole so as not to come off. A cylindrical member 62 having a tapered surface that expands forward is held at a position corresponding to the cylindrical portion 60 in the hollow portion of the hollow spindle 55 on the inner peripheral portion of the front end side. A nut 63 is screwed to the rear end of the drawbar, and the spring bias of a large number of annular leaf springs 64 interposed between the nut 63 and the shoulder on the inner peripheral side of the hollow spindle 55. Due to the force, the drawbar 59 is always subjected to a backward pulling force, and due to this spring biasing force, each ball 61 moves along the tapered surface on the inner circumference side of the cylindrical member 62 and tightens the tool holder shaft 58. , the tool holder 57 is securely held within the tapered surface 55.

When removing the tool holder 57 from the hollow spindle 55, rotate the talent head 17 and remove it from the spindle head 1.
6 to the tool exchange position, then move the drawbar 59
The proximal end surface of the tool holder 57 is pressed by a push rod (described later) against the biasing force of the spring, and the gripping claw is engaged with an annular engagement groove 65 formed on the outer peripheral surface of the tip end of the tool holder 57. By pulling the hollow spindle 55 outward, the tool holder 57 can be removed from the hollow spindle 55 .

A pressurized air introduction hole 59c is formed in the drawbar 59 so as to penetrate in the axial direction, and when the tool holder 57 is removed from the hollow spindle 55 during tool exchange, pressurized air is introduced into the pressure air introduction hole 59c. Thereby, the tapered surface 55t can be cleaned by blowing pressurized air toward the tapered surface 55L.

In FIGS. 4 to 7, the spindle head I6 is in the machining position, and the tool 124, the tool shaft 125 of which is held by the tool holder 57, is in a cutting operation state. In contrast, the spindle head 66 is in the tool change position. A hollow spindle 69 is rotatably supported on the inner peripheral side of the spindle head 66 via a bearing 67 and a bearing group 68, and the hollow spindle 69 holds a tool holder 71 that holds a tool shaft 70. There is.

The hollow spindle 69 has exactly the same structure as the hollow spindle 55, and the driven side engagement member 72 of the clutch 44 is fixed on the outer peripheral surface of the base end of the hollow spindle 69, and the driven side An engagement groove 83 is formed adjacent to the engagement member 72. On the other hand, a bracket 79 protruding from the proximal end side of the hook 80 is pivotally supported by a pivot portion 78 of a bracket 77 fixed to the elevating frame 11 .

An engagement groove 8 for the hollow spindle 69 is provided at the tip of the hook 80.
A two-pronged engagement claw 82 that engages with the hook 80 is formed in the center of the hook 80, and an elongated long hole 81 is formed in the center of the hook 80 from the proximal end to the distal end of the hook 80. An engagement pin 76 protruding from the upper surface of the outer peripheral portion of the clutch operation cylinder 49 is loosely fitted into the elongated hole 81 . Therefore, while the clutch operation cylinder 49 is retracted and the clutch 44 is placed in the disengaged state when the talent head 17 is rotated by the operation of the turret rotation motor 21, the hook 80 is moved toward the elevator frame 11 with the pivot portion 78 as the center. However, when one of the pair of spindle heads, e.g., spindle head 16, is positioned at the processing position, the other spindle head, e.g., spindle head 66, is moved. is positioned at the tool exchange position, the clutch operation cylinder 49 moves forward, and the clutch 44 comes to a rest state, the hook 80 swings forward about the pivot portion 78 and the engagement claw 82 enters the engagement groove 83. By engaging, the hook 80 counteracts the force applied in the axial direction of the hollow spindle 69 and prevents the bearing 67 and the bearing group 68 from applying unreasonable force. A cylinder 90 is integrally formed, and this cylinder 9
The distal end of the push rod 92 that is integral with the piston rod of the piston 91 that is cold-welded inside the hook 80 can protrude toward the distal end side of the hook 80.

A flow path 93 is formed within the push rod 92,
When pressure fluid is introduced into the boat 95 as shown in FIG. When pressurized fluid is introduced into the boat 94 while the hook is engaged with the proximal end of the spindle 69, the piston 91 moves toward the distal end of the hook 80, and the push rod 92 moves along the proximal end of the drawbar 97. By pressing the drawbar 97 against the spring force of the leaf spring 98, the spindle 69
Move it to the tip side. At the same time, the channel 93 is connected to the boat 96
A pressurized air introduction hole 97c formed by the boat 96, the flow path 93, and the hollow part of the drawbar 97 communicates with the
is introduced into the annular gap between the tapered surface 69t of the tip of the spindle 69 and the tapered surface 71t of the tool holder 71.

As a result, the engagement between the drawbar 97 and the tool holder 71 is released, the tool holder 71 can be removed from the spindle 69, and the tapered surface 69t of the spindle 69 is cleaned by the pressurized air.

During this time, since the hook 80 is engaged with the proximal end of the spindle 69, the spindle 69 is not pushed toward the distal end, and no unreasonable force is applied to the bearings 67, 68.

C1 Effects of the Invention As described above, according to the present invention, the drawbar is formed with a pressurized air introduction hole penetrating the drawbar in the axial direction. It can be guided from the proximal end side to the tool holder holding section at the distal end.

In addition, a channel is opened at the tip of the push rod to feed pressurized air from the pressure air source into the drawbar's pressurized air introduction hole while the pushrod is pressing the base end surface of the drawbar. The rod also serves as a pressurized air feed device to the drawbar's pressurized air introduction hole, making it possible to feed cleaning pressurized air without installing a special pressure air feed device, making the tool drive unit structure more compact. becomes possible.

[Brief explanation of drawings]

FIG. 1 is a front view showing an example of a machine tool equipped with a support device for a tool drive unit according to an embodiment of the present invention, FIG. 2 is a plan view of the machine tool shown in FIG. 1, and FIG. Figure m-m
A plane sectional view of the main part seen along the line, Figure 4 is IV of Figure 1.
5 is a side view of the main part taken along line V-V in Fig. 4, and Fig. 6 is a sectional view of the main part in Fig. 4, FIG. 7 is a cross-sectional view of a main part similar to FIG. 6 in an operating state different from that in FIG. 6. 69... Spindle, 71... Tool holder, 92...
... Push rod, 93 ... Channel, 97 ... Drawbar, 97C ... Pressure air introduction hole

Claims (1)

[Claims] Extends in the axial direction within a hollow portion of a spindle (69) that holds a tool holder (71) at its distal end, and engages with the tool holder (71) by a spring biasing force toward the proximal end of the spindle (69). A pressurized air introduction hole (97c) is formed to pass through the drawbar (97) in the axial direction, and the drawbar (97) is opened by pressing the base end surface of the drawbar (97) against the biasing force of the spring. 97
) is disengaged from the tool holder (71) at the tip of the push rod (92).
) presses the proximal end surface of the drawbar (97) while supplying pressurized air from a pressurized air source to the drawbar (97).
A cleaning device for a tool holder holder for a machine tool, characterized in that a flow path (93) for sending pressure air into a pressure air introduction hole (97c) is open.