WO2015181153A1

WO2015181153A1 - Fine-hole drill head system

Info

Publication number: WO2015181153A1
Application number: PCT/EP2015/061565
Authority: WO
Inventors: Siegfried Gruhler; Karl Joseph ADE; Martin EMERSBERGER; Christoph HINTERMEIER
Original assignee: Mauser-Werke Oberndorf Maschinenbau Gmbh
Priority date: 2014-05-26
Filing date: 2015-05-26
Publication date: 2015-12-03
Also published as: DE112015002484A5

Abstract

The invention relates to a fine-hole drill head system comprising a tool holder (9) that is tiltably held by a membrane head (8), a slide block holder (10) carrying a slide block (12) being provided in the extension of said tool holder. The slide block is received in a fork (14) of an adjusting device (16) with pretension.

Description

Fine boring head system

description

The invention relates to a fine boring head system according to the preamble of patent claim 1.

When fine boring workpieces, such as connecting rods of a connecting rod fine boring heads can be used, which allow a radial adjustment of the cutting tool.

Such fine boring heads are disclosed for example in DE-OS 2 040 020 or AT 404 001 B. Accordingly, a fine boring head has a tool holder which is mounted tiltably on a membrane head. The remote from the tool end portion of the tool holder has a sliding block holder on which a sliding block is mounted, which dips into a fork of an adjusting device. The guide surfaces of the fork are set at an angle to the tool axis. By means of the adjusting device, the fork can be displaced in the axial direction, so that the tool holder is pivoted about its pivot point formed by the diaphragm head to effect the radial adjustment of the tool cutting edge. The fine boring head is inserted into a tool spindle through which the rotary drive of the tool cutting edge takes place.

These known fine boring heads are equipped with different length and heavy tools - accordingly there is a problem in exactly balancing the entire system consisting of the fine boring head and the tool spindle, so that the high speeds required for such Feinbohrkopfsysteme are mobile. Another problem is that these systems have a certain amount of play, which limits the machining accuracy, especially when reversing the tool cutting edge.

In contrast, the invention has the object to provide a Feinbohrkopfsystem in which the disadvantages described above are eliminated. This object is achieved by a fine boring head system having the features of patent claim 1.

Advantageous developments of the invention are the subject of the dependent claims.

According to the fine boring head system has a tool holder which is tiltably mounted on a membrane head and which is indirectly and directly connected to a sliding block holder, which carries a sliding block. This is guided in a fork with obliquely arranged to the tool axis guide surfaces. The fork can be adjusted for radial adjustment of the tool by means of an adjusting device in the axial direction, so that the tool holder according to the

Pivoting the diaphragm head is pivoted. According to the sliding block is performed with bias in the fork. It is preferred if this bias voltage is provided in the zero position of the diaphragm dipping head, so that an adjustment from this zero position out in both adjustment is made possible without play - the fine machining can thus be performed with considerable accuracy. In a preferred embodiment, the sliding block is suitable

Embodiment torsionally biased.

According to the invention, the system consisting of the sliding block and the fork can be made still damped. This damping can for example be done by pockets that are filled with a damping medium. The resulting squeeze damping is well known, so that further explanations are unnecessary.

Additionally, additional slots or pockets may be provided which are filled with a damping material to vary damping characteristics. The damping can be further improved if the sliding block holder by means of a Hilfsmassedämpfers (HMD) is damped in the radial direction and optionally also in the axial direction.

The damping is particularly effective when damping elements of the system are arranged at the maximum distance to the diaphragm pivot point.

In the exemplary embodiment of the invention, the tool spindle carrying the fine boring head is provided with a spindle damping device.

Alternatively or additionally, a tool damping device can also be provided.

The sliding block can be performed on the one hand with twistable sections, which are guided in the above fork. On the other hand, elements can be provided via which torque is transmitted to an actuator of the adjusting device.

The play of the fine boring head system can be further reduced, even if the membrane of the membrane head is biased in the zero position.

Preferred embodiments of the invention are explained in more detail below with reference to schematic drawings. FIG. 1 shows a schematic view of a fine boring head system according to the invention for machining a connecting rod eye;

FIG. 2 shows a further basic illustration of a fine boring head system according to the invention;

FIG. 3 shows the schematic illustration according to FIG. 2 with a replacement diagram characterizing the damping of a cooling block;

Figure 4 is a sectional view through a concrete solution of a fine boring head; FIG. 5 shows a first exemplary embodiment of a sliding block of a fine boring head according to FIG. 4; Figure 6 views of another embodiment of a sliding block; Figure 7 is a schematic representation of the elastic deformation of the sliding block of Figure 5 and 6;

FIG. 8 replacement diagrams of different embodiments of a fine boring head system according to the invention.

FIG. 1 shows in a highly schematized manner a basic diagram of a fine boring head system 1 according to the invention for the fine boring of a connecting-rod eye 2. As shown in Figure 1, the entire system consists in principle of the

Machine structure 1 ^* , on which a spindle stand 2 ^* is mounted with the spindle 3 ^* . This spindle 3 ^* carries a fine boring head 4 with the membrane head 4. The tool for machining the workpiece 6 ^* is provided in Figure 1 with the reference numeral 5 ^* . Furthermore, in FIG. 1, the positions of possible damping elements which are accordingly in the range of the machine construction, spindle box, the spindle bearing or the spindle, the Feinbohrkopfs (diaphragm head), the tool and the workpiece clamping (see reference I, II, III, IV , V) can be arranged. Any combination of such damping elements can be provided to increase the accuracy.

FIG. 2 shows a schematic representation of the fine boring head system 1 from FIG. 1. This has a fine boring head 4 with a tool holder 6, which on a

Membrane head 8 is pivotally mounted in the arrow direction. In extension of the tool holder 6, a sliding block holder 10 is arranged, which carries a sliding block 12. This is guided in a fork 14 of an adjusting device 1 6, which is designed for example as a suit. As explained, guide surfaces 20, 22 of the fork 14 are employed obliquely for the sliding block 12, so that when the fork 14 is axially displaced by means of the adjusting device 16, the radial adjustment of the tool cutting edge takes place. The entire fine boring head 4 is rotatably connected to a spindle 10, so that the rotational movement of the spindle 10 is transmitted via the diaphragm head 8 to the tool holder 6 and thus the tool. In Figure 2 below is a plan view the membrane head 6 shown. One recognizes the centrally arranged membrane 1 8, which allows the pivoting of the tool holder.

FIG. 3 shows a torsional vibration model of the system. In this, as will be explained in more detail below, the sliding block 1 2 is received with a bias in the leadership of the fork 14. Furthermore, the sliding block 12 is formed with pockets 20 which are designed such that a squeeze oil film damping comes into effect. These pockets are provided in Figure 2 by the reference numeral 1 9. In FIG. 3, the symbols of the resulting damping elements are likewise identified by the reference numeral 1 9.

FIG. 4 shows a concrete solution of the fine boring head 4 (without spindle).

One recognizes the tool holder 4 to which a tool holder of a tool can be clamped. This tool holder 4 is held tiltably on a membrane head 8. In extension of the tool holder 4 of the sliding block holder 1 0 is provided, which carries the sliding block 1 2. This dips into the fork 14 and lies flat on the guide surfaces 20, 22 without play. The fork 14 can be adjusted via a Planzug in the axial direction to pivot the tool holder 4 about the pivot point 24 of the diaphragm head 8.

FIG. 5 shows an individual representation of a sliding block 12 which can be used in a fine boring head 4 according to FIG. This has two contact surfaces 26, 28, with which it rests against the associated guide surfaces 20, 22. Shown is dash-dotted a torsion axis 30 to which the sliding block 12 when inserted into the

Fork 14 is twisted so that it is received in the zero position of the system with a bias in the fork 14. The sliding block 1 2 thus acts as a play-free transmission element, via which the linear displacement of the fork 14 is implemented without play in a pivoting of the tool holder.

The torsion is supported by laterally opening slots 32a, 32b and 34a, 34b, which extend transversely to the torsion axis 30. This runs transversely to the tool axis. Further, bores 36a extend transverse to the slots 32, 34, 36b and 38a, 38b, which cut the slots 32, 34 and thus form the slot bottom.

Dashed lines are still formed in Figure 5, the aforementioned 20 pockets for the realization of the squeeze effect.

FIG. 6 shows a variant of the sliding block 1 2 from FIG. 5 in a front view (a), a side view (b) and a top view (c). The central part 40 in the front view (a) and the top view (c) corresponds to FIG

Sliding block 1 2 according to Figure 5, which is twisted inserted into the fork 14. One recognizes the laterally opening slots which provide the required elasticity.

In the front view (a) and the top view (c) are laterally formed on the middle part 40 of the sliding block Drehmomentmitnehmer 42, 44, via which the sliding block 1 2 (part 40) to the adjusting device 1 6, in the present case, the rotating gate valve of Planzugs is docked. In the front view (a), these torque drivers 42, 44 are designed with an approximately trapezoidal base. The connection with the flat slide is done by screwing.

Figure 7 shows in a highly schematic manner the elastic deformation of the sliding block 1 2 according to Figures 5 and 6 when inserted into the fork 14. It can be seen that the slots 32a, 32b and 34a, 34b delimiting areas when inserted into the fork 14 elastic be deformed and thus allow the Torsionsvorspannung.

FIG. 8 again shows the replacement diagrams of different variants of a fine boring head system according to the invention. The diagram marked A.) shows two variants. In the variant a) shown above, the tool is provided with an auxiliary mass damper (HMD).

In variant b), a spindle-side auxiliary mass damper (HMD) is provided. The embodiment according to B.) shows a roller bearing spindle with a damped in the context of the invention sliding block and another separate damper of Kulissensteinträgers in the region of the diaphragm head. The inventive variant ensures that the linear movement of the Planzugs is unrestricted and free of play converted into a radial adjustment of the tool cutting edge.

The advantages of the system according to the invention thus consist in a backlash of the fork / Kulissensteinpaarung. Furthermore, a higher rigidity and improved damping of the fine boring head system is made possible.

As already mentioned, can be formed by an obliquely ground disc on the membrane body to further improve the damping of the diaphragm head.

The system according to the invention makes it possible to rotate / drill precise contours without a reversal span, whereby at the same time chamfering over a large angular range is possible. This is made possible by the symmetrical deflection and preload in the curb stone. The system is also in the zero position without balancing problems with different length and heavy tools used even at high speeds, but the tools must be balanced individually.

The torsional axis of the sliding block 12 is transverse to the actual torsion axis of the surface guide, so that the torsion of the sliding surface can be compensated for about the axis of rotation of the control plan.

Disclosed is a Fei nboh rkopfsystem with a tiltably held on a membrane head tool holder, in the extension of a sliding block holder is provided, which carries a sliding block. This sliding block is added with preload in a fork of an adjusting device. Bezuaszeichen:

1 fine boring head system

2 connecting rod eye

4 fine boring head

6 tool holder

8 membrane head

10 sliding stone holder

12 sliding block

14 fork

1 6 adjusting device

18 membrane

19 bag

20 guide surface

22 guide surface

24 pivot point

26 contact surface

28 contact surface

30 torsion axis

32 slot

34 slot

36 bore

38 bore

40 part of the Kulissenstein

42 torque cam

44 torque driver

46 auxiliary mass damper

Claims

claims

Fine boring head system with a tool holder (6), which is tiltably mounted on a membrane head (8) and which is indirectly or directly connected to a sliding block holder (10) carrying a sliding block (12), which in turn is mounted in a fork (14). guided with obliquely to the axis guide surfaces (20, 22), wherein the fork by means of an adjusting device (16) is adjustable in the axial direction, characterized in that the sliding block (12) is received with bias in the fork (14).

Fei n bo h rko pf system according to claim 1, wherein the sliding block (12) is torsionsvorgespannt.

Feinbohrkopfsystem according to any one of the preceding claims, wherein the sliding block (12) in the contact area to the guide surfaces (20, 22) with pockets (19) is executed, which are filled with a damping medium.

Fine boring head system according to one of the preceding claims, wherein the sliding block holder (10) is attenuated in the radial direction by means of an auxiliary mass damper (HMD).

Fine boring head system according to one of the preceding claims, comprising a tool spindle for driving the fine boring head (4), which is designed with a spindle damping device.

Fine boring head system according to one of the preceding claims, with a tool damping device.

Feinbohrkopfsystem according to any one of the preceding claims, wherein the sliding block (12) has a portion for transmitting torque to an actuator of the adjusting device (1 6). A fine boring head system according to any one of the preceding claims, wherein the membrane head (8) is biased in the zero position.

Fei n bo h rko pf system according to any one of the preceding claims, wherein the damping means are formed at the maximum distance from the pivot point (24) of the membrane head (8).