LU84700A1 - ADJUSTABLE TOOL HOLDER HEAD - Google Patents

Description

'* m t Adjustable tool holder head.

The present invention relates to an adjustable tool-holder head arranged on the carriage of a parallel lathe, opposite the revolver turret.

The current trend in the construction of - 5 machine tools and in particular parallel lathes "· is aimed at supplying more and more universal machines. Thus, parallel lathes are being constructed which, in addition to turning operations, make it possible to perform small drilling work off axis 10 or groove milling, for example, perpendicular to the axis of the part.

Turrets are known which are mounted on the carriage of a lathe parallel to the rear of the machine. These turrets are generally of the revolver type and consequently comprise several internal and / or external tools. This pivoting turret allows work parallel and perpendicular to the axis by means of a corresponding rotation. The drawback ____ of this known device lies in the size 20 · caused by standardized tools which are not in working condition, which limits the action and the movement of the desired tool because there is interference.

The present invention aims to overcome these drawbacks and provides an adjustable tool holder head 25 mounted on a frame which allows its orientation, head which comprises only one interchangeable tool at a time, said head allowing a rotation of the tool. around the axis thereof to machine the part clamped between the jaws of the mandrel of the parallel lathe 30 according to several preferred orientations.

According to the invention, the said frame comprises a motor intended to drive the spindle of the head in rotation, which is adapted to receive the tail of the tool i, · j. machining, and means for orienting and l) 2 blocking said head in the preselected position.

It can therefore be seen that, by means of the advantageous arrangement of the device of the invention, namely the swiveling tool-holder head, one succeeds in constituting a universal lathe which allows small milling or drilling by means of a swiveling head and very handy, the space requirements are very small.

According to the invention, the head can advantageously be locked in three positions by means of a (locking device, namely a position substantially perpendicular to the axis of the workpiece with the nose of the spindle turned towards the rear of the machine to allow the tool to be changed, a position allowing machining work parallel to the axis of the workpiece, for example off-axis drilling, and a position intended for machining perpendicular to the axis of the part, for example milling a wedge groove.

It is also advantageously possible to provide - intermediate-indexable positions. _.

It can therefore be seen that the tool holder head according to the invention having reduced dimensions is very handy and opens up wide possibilities for maneuvering and machining.

Advantageously, the parallel lathe equipped with the tool-carrying head according to the invention also comprises an automated supply of tools which allows a tool change, if possible, in masked time. This obviously allows maximum speed in the execution of machining jobs other than turning. Therefore, in addition to the speed at

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tool change, the tool head has, compared to known devices, increased maneuverability and maneuverability.

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Preferably, the means making it possible to orient and block the tool-holder head consist of two pistons, the rod of the first allows the rotation of the tool-holder head in both directions and the rod of the second piston blocking the axis. around which said head is oriented, by means of flats, for example.

According to the invention, the tool holder head comprises a spindle adapted to receive the tail of the machining tool used, said spindle being provided with a device for fixing and expelling the tool, as well as a device for indexing the spindle to a precise position.

While the tool attachment and expulsion device is known per se, the spindle indexing device 15 also falls within the scope of the present invention. According to the invention, the indexing device consists of two pistons in series, the first of which presses, via its rod, on a heart-shaped cam secured to the spindle, the axis of rotation of said cam corresponding to the axis of. laiihrodhe, and the second of which engages by means of its rod provided with a lug, in a precise notch made in the wall of the spindle of the tool holder head.

'25 When the operator interrupts the drive of the tool spindle and when it tends to stop, the actuation of the first piston has the effect that the end of the rod thereof, possibly provided a ball or a roller reducing friction, drives the spindle in rotation until it ““ engages firmly in the hollow of the cam in the shape of a heart. At this instant, the second piston placed in series is actuated and engages a lug secured to the end of the rod in a firmer notch 35 provided for this purpose which is formed in the wall of the tool-holder spindle.

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It should be noted that, according to the present invention, a motor arranged in the rigid frame, makes it possible to drive in rotation, whatever the orientation chosen of the head, a tool-holder spindle which is mounted in said orientable head. In addition, the orientation device I makes it possible to orient the entire head · * comprising a tool-holding spindle, a device for fixing and expelling the tool, a device for indexing the position of the spindle and other 10 accessories which will appear more clearly below. A merit of the present invention therefore consists in the advantageous arrangement of the various functional members while allowing increased maneuverability of the tool head.

The precise indexing of the spindle is particularly advantageous when using an automatic tool feed. Since the conical clamping is not sufficient to resist the torque which urges the tool, the tail thereof is provided with a lug adapted to a corresponding notch made in the spindle. .

Other details and advantages will appear more clearly during the more detailed description of a preferred embodiment with reference to the figures. 25 in which: - Figure 1 schematically shows the location of the tool holder head on the carriage of a parallel lathe; - Figure 2 shows a side sectional view of the fixed frame equipped with the tool holder head according to the invention; '- Figure 3 shows a sectional view along line III-III of Figure 2; - Figure 4 shows a front view of the device 35 of the invention; and 5 - Figure 5 shows a sectional view along line V-V of Figure 2.

In the figures, identical reference marks represent identical or similar elements or members 5.

FIG. 1 represents a carriage 1 sliding on slides parallel to the axis of the parallel lathe 2 and of the mandrel 3. The tool-carrying carriage 4 which can move perpendicular to the axis comprises a turret 5, for example for a revolver , and a tool holder head 7 according to the invention, disposed at the rear of the machine. The three preferred positions of the adjustable head 7 are also shown.

According to the invention, the adjustable head 7 is advantageously mounted on a frame 9 which is fixed and integral with the tool-carrying carriage 4. The frame 9 advantageously comprises a motor 11 which drives, by means of a belt transmission 13 for example, a bevel gear 15 which transmits the rotational movement to the tool spindle 16 of the head 7 according to the invention. The means of transmitting the rotational movement may also be different from that indicated in the figure, such as a gear only for example.

The frame 9 also includes a means for orienting and blocking the tool-holder head, which is constituted by two cylinders 17 and 19, the first of which! 17 rotates the head 7 around the axis 20 in both directions and the second of which 19 blocks the head 7 in the chosen position by acting on a flat 21 formed on the shaft 22 supporting the head 7.

According to another embodiment, the orientation means 17 may also consist of a stepping motor or of another suitable member suitable for this purpose.

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So that the spindle can rotate for any position of the head 7, the axis 20 is materialized by two concentric shafts; a first 22, the inner hollow shaft, is provided with various arrangements (21) 5 allowing rotation and blocking of the head 7; a second inner shaft 14 transmits the rotational movement to the gear 15.

According to the embodiment represented in FIG. 2, the spindle 16 rests on two bearings with ball bearings 25 and 27. The front end of the spindle 16 consists of a conical nose adapted so as to be able to receive the tail d '' a specific tool.

The front nose is provided with a lug 29 engaging in a corresponding notch made in the tool 15 and / or vice versa, the tool has a lug adapted to a notch in the spindle 16.

The inner end of the spindle 16 is equipped with a tool attachment and expulsion device 30 controlled by a suitable member 31 known per se.

According to a particularly preferred embodiment of the present invention, the head 7 also includes an indexing device making it possible to position the spindle 16 precisely and repetitively for changing the tool. Any device known per se can be used for this purpose. The present invention however also covers a particular indexing device composed of two pistons placed in series 33 and 35. The rod 37 of the first piston 33 ends in a ball or a roller which engages in the hollow of a cam 39 in the shape of a heart which is integral with said spindle 16. When, in this way, the spindle is immobilized and given the stroke of the piston 33, the second piston 35 35. is actuated and engages its rod end in the form / 7 h of lug 40 in a corresponding notch 41 formed in the wall of spindle 16.

The orientable head 7 is advantageously equipped with a probe system 42 known per se which allows 5 different characteristic measurements of the workpiece.

It is easy to see that the tool holder head according to the present invention makes work on a · lathe absolutely universal. It is advantageously possible to carry out machining work parallel or perpendicular to the axis of the part when the latter rotates and when the tool is stationary. This arrangement allows external or internal machining such as bores in the axis of the part. In this case, it is obvious that the lug 29, for example, and the lug 40, must resist the torque urging the tool. One can also keep the workpiece fixed by rotating the tool in the tool holder head 7 according to the invention. Works 20 parallel to or perpendicular to the axis of the part make it possible to produce bores or tappings, even off axis, or milling grooves, for example.

It is obvious that the invention is not limited to the embodiment described in the present specification but that it also includes any modification made to the device of the invention.

Thus, one can also provide, in the -head 7, 30 a fixed pin which is, therefore, not housed

In ball bearings, for attaching tools intended to machine the part when it rotates. This allows a smaller dimensioning of the bearings which must no longer resist 35 λ to vibrations for a fixed position of the tool.

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We also note an important advantage brought by the probe system which makes working on the parallel lathe absolutely universal. The transmitting probe which has a tail analogous to that of the tools 5 can be placed in the spindle of the orientable head. The receiving part 42 is fixed to the adjustable head.

• It is quite obvious that the maneuverability of the orientable head makes it possible to measure efficiently and quickly the characteristic dimensions of a workpiece 10 to be machined clamped in the mandrel according to a two-dimensional coordinate system. The numerical control can obviously render incomparable services to. the orientation of said head during the above measurements

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Claims (9)

1. Tool holder head intended to be mounted on a parallel lathe, characterized in that it. is rotatably mounted on a frame (9) fixed on the carriage (4) of a parallel turn, 5 in that it comprises only one tool at a time and in that it allows rotation of The tool around the axis thereof to machine the part clamped between the jaws of the mandrel (3) of said parallel lathe (2) according to several preferred orientations. 10 2. Tool-holder head according to claim 1, characterized in that it is orientably mounted on a frame (9) which comprises a motor (11) intended to drive the spindle (16) of said head (7), which is adapted to receive the tail of the machining tool and means (17, 19) for orienting and locking said head (7) in the preselected position. 3. Tool holder head according to claim 2, characterized in that the means making it possible to orient and block the head (7) consist of two pistons (17, 19), the rod of the first piston (17) causing rotation of the head (7) in both directions and the rod of the second piston (19) blocking the shaft (22) by which said head is oriented by acting on the flats (21) formed in this shaft (22). 4. Tool holder head according to claim 3, characterized in that the shaft (22) has three flats (21) allowing three preferred positions of the head, namely a perpendicular position 30. the axis of the workpiece , the nose of the spindle (16) being directed towards the rear of the machine, a position parallel to the axis of the workpiece and. a position perpendicular to the axis of the workpiece, h 10 the nose of the spindle being turned towards the front of the machine. 5. Tool holder head according to any one of the preceding claims, characterized in that the spindle (16) is provided with a fixing device and. the tool. - 6. Tool holder head according to any one of the preceding claims, characterized in that the spindle (16) is provided with an indexing device 10 for the spindle (16) at a precise position. 7. Tool holder head according to claim 6, characterized in that the indexing device consists of two pistons in series (33, 35), the first (33) of which presses, via its rod, on a heart-shaped cam (39) integral with the spindle (16), the axis of rotation of said cam (39) corresponding to the axis of the spindle (16), and the second of which (35) engages , by means of its rod provided with a lug (40), in a specified notch (41) formed in the wall of the spindle (16) of the tool holder head. 8. Tool holder head according to any one of the preceding claims, characterized in that it comprises a probe system (42) which allows the use of a probe for the characteristic measurements of the workpiece, in a two-dimensional coordinate system. 9. Tool holder head according to any one of the preceding claims, characterized in that it comprises a fixed spindle which is not housed in ball bearings, making it possible to fix non-rotary tools working on the part in ^^ otat ^^^ j