JPS6216244Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention relates to a clamping device for a tool holder.
In particular, it relates to a clamping device for tool clamps on turrets or similar support members.

(Prior Art) For machine tools and similar tools used in production processes, it is important to maintain the tools in correct workpiece handling conditions at all times.

This includes maintaining the machine's cutting tools in sharp cutting conditions, and this is done by immediately replacing the cutting tool with a new one once it has dulled by a predetermined amount. It will be achieved.

There are a large number of cutting tool systems available today, including small inserts made of extremely hard wear-resistant materials, such as carburized cemented carbide. These inserts are typically removably mounted in a tool holder, which in turn is removably mounted on the machine tool in which they are used.

Cutting tools can therefore be modified by replacing the insert in each tool holder with a new one, or by replacing a tool holder with a worn insert with another tool holder with a new insert. , it is possible to update quickly.

The latter procedure involves precisely positioning the insert in a tool holder outside the machine tool, and then ensuring that when the tool holder is installed on the machine tool, the insert is precisely positioned and no adjustments are made to the machine tool. It is often preferred because it eliminates the need to add additional components, allowing continued production of workpieces with the correct dimensions.

Prior U.S. Pat. No. 3,496,653 (issued to James F. McCreary) discloses a novel structure for coupling a tool holder to its supporting member turret and the like, in which the tool holder is mounted within the tool holder. a radially movable clamping element actuated by an axially movable actuating member, the tool holder being coupled to the clamping element by a screw also carried in the tool holder. It is configured so that it can be approached and moved away from it.

(Problem that the invention seeks to solve) Although this structure has shown to be highly satisfactory in terms of positioning and clamping the tool holder in place, it requires the use of an external tool, a wrench, to turn the screw. It therefore has the disadvantage of being somewhat slow in operation and requiring some effort to use.

That is, this structure is inconvenient in that it requires an external tool to release the tool holder.The solution of the present invention is to overcome this drawback and eliminate the need for an external tool to release the tool holder. This is a problem that should be addressed.

One purpose of this invention is to provide an extremely quick device for changing tools within a turret or similar support member.

Another object of the invention is a mechanism for removably coupling a tool or tool holder mounted on a support member, such as a turret, without the need for external tools, which allows the tool or tool holder to be assembled quickly and with minimal effort. The object is to provide something that can be replaced with effort and even during the operation of the machine of which the support member or turret forms part.

Yet another object of the invention is to provide a mechanism having the above-mentioned characteristics, including a coolant supply device for pouring coolant into the cutting corners of the cutting tools supported by the respective tool holders. be.

(Means for solving the problem) According to the present invention, the above problem can be solved by providing a tool holder clamping device for coupling and aligning a tool holder to a support member, in which the tool holder is received in a hole provided in the support member. a shank portion, the support member having a tubular element coaxially mounted within the bore and received within the shank portion; a shoulder portion within the shank portion; a movable clamping element disposed within the tubular element and when actuated to move the clamping element into engagement with the shoulder portion to clamp the shank portion to the support member; an actuation element for unclamping the shank portion to the support member; a plunger disposed within the support member for actuating the actuation element; The invention is solved by a quick-acting coupling and positioning device for a tool holder, characterized in that it is equipped with operating means capable of operating the tool holder.

The operating means is preferably a fluid operating device for operating the plunger using fluid pressure or a cam, or a manual cam operating device.

The support member is rotatable and the tool holder is configured to be removable from the support member only at predetermined rotational positions of the support member.

The support member is a rotatable turret, and the turret is configured to have a plurality of the tool holders distributed around the turret, and is configured to supply coolant to the cutting insert on each tool holder. A coolant supply passage is provided.

Preferably, the coolant passage includes a first portion formed in the turret and a second portion formed in each of the tool holders, the second portion configured to direct coolant in a desired direction. be done.

Preferably, a coolant supply device is provided, which is configured to communicate with the coolant passage only when each tool holder is in the working position.

EXAMPLES The exact nature of the invention will become clearer from the following detailed description of the examples and the accompanying drawings.

FIG. 1 shows a tool support member or turret 10 having a plurality of machining positions 12 distributed around its periphery in plan view, each machining position having a radial hole 14 formed in the turret 10. Each hole is configured to receive a tool assembly 16 comprising a tool holder 18 and a cutting insert or cutting element 20 mounted thereon. Although only one tool set is shown in FIG. 1, a tool set is of course provided at each working position 12.

Moreover, the individual tools do not have to be oriented in the illustrated positions, but may be placed in different orientations with respect to the axis of the tool unit. In the arrangement of FIG. 1, each working position of the turret 10 is provided with a key element 22 which is fitted into a recess in the respective tool holder 18 and which locks the tool holder when the tool holder 18 is mounted on the turret. The role is to hold it in the turret so that it does not rotate.

As shown in FIG. 3, each key element 22 may be pin-shaped and fit into a precisely positioned hole in close proximity to the working location. That is, each tool holder 18 is provided with a hole or notch 24, and each working position is provided with an associated key element 22.
is fixedly accepted (Figure 2). In FIG. 2, the notch 24 is shown offset in the circumferential direction from its actual position so that the state of engagement with the pin 22 can be clearly seen.

Looking at Figure 2, each hole is located at the shaft portion 2 with the larger outer diameter.
6 and the following threaded portion 28 with a small outer diameter
and an outwardly directed shoulder portion 30 located therebetween. In the structure described above, the axially outer end portion 34 is tightly fitted to the shaft portion 26 having a large outer diameter.
and a threaded portion 36 that is threadedly engaged with threaded portion 28.

The axially inner end 38 of the sleeve 32 has a beveled portion 40 on its inner periphery, the inner side of which is more or less connected to the structure of the turret 10 and the shoulder portion 30 in the turret 10 and the shoulder portion 42 of the sleeve 32. Beveled portion 40 relative to the planar end surface 44 of turret 10 facing radially outwardly at the periphery of bore 14
Provides precise axial positioning of the

The tool holder 18 has a radially extending portion 46 abutting the end surface 44 of the turret 10 and a cylindrical shank portion 48 that is tightly but slidably fitted inside the sleeve 32. There is. The shank portion 48 is integrated at its forward end with a head portion 50 which includes a recess 52 for receiving a cutting insert 54 which is removably secured by a clamp 56.

The shank portion 48 is provided with a hole 58 extending axially inwardly from its rear end and a hole 60 extending radially within the shank portion in the axial region of the beveled portion 40 . 3
Advantageously, three holes 60 and three ball-shaped clamping elements 62 are provided. The ball-shaped clamping element 62 has a rubber O-ring 6 attached to the shank portion 48.
Captured by 4.

An actuating element 66, which may also be in the form of a ball, is inserted into the shank section behind the ball-shaped clamping element 62 and is retained by a snap ring 68 provided at the rear end of the shank section 48. When the ball-shaped actuating element 66 is in the rearmost position defined by the snap spring 68, each ball-shaped clamping element 62 can be moved radially inwardly and the tool holder 18 can be extracted from the sleeve 34. However, if the ball-shaped actuating element 66 is moved to the right in FIG.
2 is pushed radially outward and engages the beveled portion 40 such that the tool holder 18 cannot be pulled out of the sleeve 34.

The turret 10 has another hole 7 at the bottom of the hole 14.
0 is provided in which the piston head 74 is located.
A plunger 72 having a handle is attached so as to be reciprocatable. Bell beer spring 76 is plunger 72
is strong enough to bias the ball-shaped actuating element 66 toward the ball-shaped actuating element 65 and hold the ball-shaped actuating element 66 in the clamped position. The right end of hole 70 in the figures is closed by a packing foot or ring element 78 which is sealed against turret 10 and plunger 72 and defines a chamber communicating with conduit 80. The passage 80 is connected to a ring 82 mounted on the bottom of the turret coaxially with the axis of rotation of the turret.
The ring 82 engages a non-rotating ring 84 to effect a seal.

Ring 84 has a passageway 86 leading therefrom to the outlet of a manually actuatable valve 88 . Valve 88 has a valve member 90 that in the illustrated position directs pump 92 into passageway 86 and through passageway 80.
and in other positions, the passageway 86 is in communication with a tank or reservoir 94.

This structure is such that at each indexed position of the turret, passage 86 is aligned with passage 80 belonging to a tool holder that is not in the working position. At this time, when the valve member 90 is operated, the plunger 7 first
2 is moved to the left to release the tool holder from the turret and then to the right to clamp another tool holder in the associated working position on the turret. Thus spring 76, conduit 80, valve 88, pump 9
2. The tank 94 constitutes a fluid pressure operating device that is an operating means for operating the plunger 72. It will therefore be appreciated that the release of a tool holder within the turret and the clamping of other tool holders to it can be carried out very quickly and without interrupting the operating cycle of the machine. For example, in the upper part of FIG. 1, the tool holder designated A is in the machining position, and the tool holder designated B is the one shown in FIG. 2, in the exchange position.

Instead of the radially movable plunger 72, a plunger 100 as shown in FIG. 5 may be used for cooperating with the actuating element 66. The plunger 100 is formed with a cam surface 102 that cooperates with the actuating element 66 and is biased in one direction by a spring 104 to direct fluid pressure to the plunger end 100 by a fluid pressure actuating device such as that shown in FIG.
can be moved in the opposite direction by feeding the

The operation of the modified example in FIG. 5 is the same as that in FIG.

FIG. 6 shows how the plunger 110, biased against the actuating element 66 by a spring 112, is provided with manually operable plunger withdrawal means.

In FIG. 6, plunger 110 has an axial slot 114 on one side thereof and a lateral slot 116 extending therethrough.

A rod 118 extends through the slot 116 and is provided with an actuation lever 120 rotatable within the turret 10 and manually operable, as well as an eccentric cam 122 located within the slot 114. Rotation of lever 120 in any position of the turret releases each tool holder from its associated working position or clamps the tool holder in its associated working position. In this case, spring 112, slot 114, rod 118, actuation lever 120, and cam 122 constitute a manual cam operating device.

The device is equipped with a limit switch 13 as shown in FIG.
A zero-shaped detector can be provided, which means that if each tool assembly is not fully depressed but clamped, the limit switch 130 will cause the incorrectly installed tool to shut down before it reaches the work position. Stop the machine and/or sound the alarm.

FIGS. 7 and 8 show another embodiment in which the clamping element and its associated actuating element are supported on a turret or support member. In FIG. 7, a turret or support member 150 is formed with a hole 152 intersected by a threaded hole 154 into which a tubular element 156 is threadably mounted. Tubular element 156 extends axially along bore 152 and defines an annular recess therewith.

In FIG. 7, the tool holder for the cutting insert is indicated at 158, which tool holder 158 has a recess at its axially outer end for receiving the insert 160, and at its other end is formed by a hole 152 and a tubular element 156. and an annular shank portion 162 that is received in the annular recess. shank part 162
has an annular groove 164 in its interior, which forms a shoulder portion 166 that can be engaged by a ball-shaped clamping element 168 mounted in a radial hole molded in the tubular element 156.

The clamping element 168 can be moved radially by a ball-shaped actuating element 170 within the tubular element 156, which ball-shaped actuating element 170 is a screw actuator that can be actuated by a suitable wrench inserted into a hole 174 in the tool holder 158. 172.

The support member 150 and tool holder 158 each have abutment surfaces 176, 178 formed therein;
When the tool holder 158 is inserted into the support member 150, which may be a turret, and the screw 172 is actuated, the abutment surfaces 176, 178 hold each other tightly, thereby holding the tool holder 158 within the support member 150. axially position and clamp there.

Rotation of the tool holder 158 is prevented by a pin-shaped key element 180 mounted within the support member 150 and fitting into a notch within the tool holder 158.

Although FIG. 8 is similar to FIG. 7 and the same reference numerals are used, there are differences in the following points.

In FIG. 8 the ball-shaped actuating element 170 is placed behind the clamping element 168 and the tubular member 15
6 is configured to be actuated back and forth into and out of its clamped position by a plunger 182 extending through the rear or inner end of the clamp.

Plunger 182 is adapted to be actuated either by a hydraulic actuator as shown in the FIG. 1 embodiment, or by a manual cam actuator as shown in the FIG. 6 embodiment. In Figure 8,
Plunger 182 is preferably biased to the right in the drawings so as to always clamp the tool holder to support member 150.

In the modification of FIG. 9, the support member 190 has a tapered recess 192 therein and the tool holder 194 has a tapered shank portion 196 that fits into the recess 192. As can be seen, the tool holder 194 does not have an abutment surface perpendicular to the ring of the holder, but has tapered surface portions 198 and 200 on the shank portion and a tapered recess 1.
It is positioned only by engagement with the surfaces of 92.

In the modified example of FIG. 9, the tubular member 202 is
Like tubular member 156 of FIGS. 7 and 8, it is threadedly engaged with the end of tapered shank portion 196;
a ball-shaped clamping element 204 mounted within a tubular member 202 and a ball-shaped actuating element 206;
The actuating element *206 is placed in a position to be actuated by the reciprocating plunger 208 supported by the support member 190, and is configured to be actuated by any of the methods in each of the embodiments described above.

FIG. 10 shows yet another modification. In this variant, a block 250 is provided which can be fixed to the slide of the machine;
A hole is provided in the block 250 to receive a tool holder 252 to be held by any of the mechanisms described above. Block 250 may be used with an automatic tool change mechanism in which indexing of the block is not necessary and the tool holder can be removed from or installed thereon while the machine is running.

Block 250 is, for example, 2 in FIG.
It may also be indexable about a central axis extending through the point indicated at 54. In this case, the tool holders can be inserted into the central hole of the block from each end, each tool having an actuation mechanism for clamping its associated tool holder to the block. Structures of this nature are also designed to be used in conjunction with automatic tool changing units, with the advantage that one tool can be changed while another is being worked on.

When the tool holder advances the tool insert mounted thereon into a working position, it is desirable to supply a cooling fluid to the tool insert.

According to this invention, referring to FIG.
77 communicates with the fixed nozzle 279. When the turret is indexed, nozzle 279 slides over the top of the turret and communicates with each inlet 281 in turn.
Each inlet 281 is connected to an inlet 285 by a respective passageway 283, and each inlet 285 is engaged by a flange portion 46 of a respective tool holder.

The tool holder has a passageway 287 formed therein which communicates at one end with the inlet 285 and at the other end through which cooling fluid is injected for operation of the respective tool inserts installed in the tool holder. Oriented to point toward a position. In this way, the coolant supply source 275 and the first portion 283 and second portion 287 of the coolant passage constitute a coolant supply device.

As is known, the individual inserts of several tool holders will each have a different shape. The arrangement of the invention provides for adequate cooling fluid supply to each insert as it is brought into its working position.

This arrangement allows economical use of cooling fluid and eliminates the need to ensure that each insert is properly supplied with cooling fluid.

Further, various changes can be made to the above embodiments within the scope of the claims for utility model registration.

[Brief explanation of the drawing]

FIG. 1 is a slightly schematic plan view showing one way in which the inventive turret can be provided with the inventive tool holder, and the tool holder in two of the plurality of positions of the turret is shown. has been done. FIG. 2 is a sectional view taken along the lines .about. in FIG. 1, showing more schematically the means for controlling the clamping of the tool holder to the turret. FIG. 3 is a partial cross-sectional view showing the attachment of a key element to the support member that engages the tool holder and prevents rotation of the tool holder within the support member. FIG. 4 is a partial sectional view showing a detector for determining whether the tool holder is correctly attached to the support member. FIG. 5 is a sectional view similar to FIG. 2, but showing a modified structure. FIG. 6 is a partial cross-sectional view similar to FIG. 2, but showing yet another modification. 7 and 8 are partial cross-sectional views showing an alternative example of the clamping device according to the present invention. FIG. 9 is a partial sectional view showing an application of the present invention to a tool holder having a tapered shank portion instead of a cylindrical shank portion. 1st
FIG. 0 is a schematic plan view showing a modification example in which the support member is not a multi-position turret. Explanations of the symbols in the figure are as follows. 10...Supporting member, ie, turret, 12...
Working position, 18... Tool holder, 20... Insert tool or cutting element, 22... Key element, 24
...Notsuchi, 30...Shoulder part of the turret, 32...
... tubular element or sleeve, 40 ... beveled portion of the sleeve, 42 ... shoulder portion of the sleeve, 44 ...
...End face of turret, 48...Shank part, 54
... Cutting insert tool, 58 ... Axial hole (shank), 60 ... Radial hole (shank), 62
... Ball-shaped clamp element, 66 ... Ball-shaped actuating element, 72 ... Plunger, 74 ... Piston head, 80 ... Conduit, 88 ... Valve, 90 ... Valve member, 92 ... Pump, 100 ... plunger,
118... Bar, 130... Limit switch, 150
. . . Support member, 152 . . . Hole, 156 .
... Ball-shaped actuating element, 172 ... Screw, 176
...Abutting surface, 178...Abutting surface, 182...
Plunger, 190... Support member, 192... Tapered recess, 194... Tool holder, 196...
... Tapered shank portion, 198 ... Tapered surface portion, 200 ... Tapered surface portion, 202 ...
Tubular member, 204... Clamp element, 206...
Actuation element, 208...Reciprocating plunger, 275...
... Coolant tank, 277 ... Pump, 279 ... Stationary nozzle, 283 ... First part of coolant passage, 28
7...Second part of the coolant passage.

Claims (1)

[Claims for Utility Model Registration] 1. A tool holder clamping device for coupling and aligning a tool holder to a support member, wherein the tool holder 158 has a shank portion 162 that is received in a hole 152 provided in the support member 150; The support member includes a tubular element 156 coaxially mounted within the bore and received within the shank portion, a shoulder portion 166 within the shank portion, and a clamping element movable in its radial direction relative to the tubular element. 168; when positioned within the tubular element and actuated, the clamping element is moved into engagement with the shoulder portion to clamp the shank portion to the support member or out of engagement with the shoulder portion; an actuation element 170 for releasing the clamp of the shank portion to the support member; a plunger 182 provided in the support member for operating the actuation element;
operating means 76, 80, capable of operating said plunger without the need for external means;
88,90,92,94;100,104,8
0,88,90,92,94;112,11
4, 118, 120, and 122. 2 Utility Model Registration In the description of claim 1, the operating means is a fluid pressure operating device 76, 80, 8 for operating the plunger using fluid pressure.
8,90,92;100,104,80,8
8, 90, 92. A quick-acting positioning device for a tool holder. 3 Utility Model Registration In the description of claim 1, the operating means is a manual cam operating device 112, 1 for operating the plunger with a cam mechanism.
14, 118, 120, 122. A rapid action positioning device for a tool holder. 4 Utility Model Registration In the statement of any one of claims 1 to 3, the support member is rotatable, and the tool holder is rotatable only at a predetermined rotational position of the support member. A quick-acting positioning device for a tool holder, characterized in that it is removable from a support member. 5 Utility Model Registration Claims In any one of claims 1 to 4, the support member is a rotatable turret 10,
The turret is configured to have a plurality of the tool holders distributed around it, and has a coolant supply passage 28 for supplying coolant to the cutting insert 160 on each tool holder.
3,287 A quick-action positioning device for a tool holder. 6 Utility Model Registration Claim 5 provides that the coolant supply passage includes a first portion 283 formed in the turret and a second portion 287 formed in each of the tool holders; 2
A quick-acting positioning device for a tool holder, characterized in that the section directs coolant in a desired direction. 7 Utility Model Registration In the description of claim 6, coolant supply devices 275, 277, 279 are provided, and the coolant supply device supplies the coolant only when each tool holder is in the machine tool. A quick-acting positioning device for a tool holder, the device being configured to communicate with a supply passageway.