Modular carrier tool and tool head

Abstract

The modular carrier tool (2), in particular drilling tool, extends along a central longitudinal axis (4) in axial direction (6) and comprises a carrier (8) as well as a tool head (10) that can be reversibly mounted on the front-end of the carrier (8). The carrier (8) has a head retainer (14) for the insertion of the tool head (10) as well as clamping webs (24), which radially delimit the head retainer (14) and also have bearing surfaces (28). The tool head (10) comprises clamping surfaces (35) extending in axial direction as well as underhead bearing surfaces (34). In a mounted state the clamping webs (24) clamp the tool head (10) in radial direction to the clamping surfaces (35) and the underhead bearing surfaces (34) are pressed against the bearing surfaces (28). In order to generate a force component (K) acting in radial direction unto the clamping webs (24), the bearing surfaces (28) as well as the underhead bearing surfaces (34) are tilted in radial direction towards the central longitudinal axis (4) by a tilt angle . This particularly supports the radially exerted clamping force of the elastic clamping webs (24).

Claims

1. A modular carrier tool which extends along a central longitudinal axis in an axial direction and comprises a carrier as well as a tool head that can be reversibly mounted on a front-end of the carrier, wherein: the carrier comprises: a head retainer for the insertion of the tool head; and clamping webs which define radially outermost portions of the head retainer and include bearing surfaces extending along a radial direction; and the tool head comprises: clamping surfaces extending in an axial direction; underhead bearing surfaces; flute sections; and torque transmission surfaces which: extend radially to an outer periphery of the tool head; and extend axially from the underhead bearing surfaces toward a front of the tool head; wherein, along a peripheral direction of the tool head, each of the underhead bearing surfaces extends between one of the torque transmission surfaces and one of the flute sections; wherein, in a mounted state: the clamping webs clamp the tool head to the clamping surfaces in a radial direction with respect to the central longitudinal axis; and the underhead bearing surfaces are pressed against the bearing surfaces of the carrier; wherein the bearing surfaces of the carrier and the underhead bearing surfaces are tilted at a tilt angle defined along a radial direction with respect to the central longitudinal axis, such that in the mounted state a force component is exerted on the clamping webs in a radial direction with respect to the central longitudinal axis.

2. The carrier tool according to claim 1, wherein: the bearing surfaces of the carrier and the underhead bearing surfaces are tilted radially outwardly, such that the exerted force component is oriented in a radial direction towards the central longitudinal axis.

3. The carrier tool according to claim 1, wherein the tilt angle is in the range of 0.5 to 10.

4. The carrier tool according to claim 1, wherein the underhead bearing surfaces and the bearing surfaces of the carrier are conical shell segments.

5. The carrier tool according to claim 1, wherein: the clamping webs each have an open front end face; each open front end face, in the mounted state, is not covered by the tool head; the bearing surfaces of the carrier are recessed, in an axial direction, relative to the open front end faces; and surfaces for torque transmission are formed between the end faces and the bearing surfaces of the carrier.

6. The carrier tool according to claim 1, wherein, for clamping retention in the head retainer, a fastening pin is adjoined to the underhead bearing surfaces in an axial direction.

7. The carrier tool according to claim 1, wherein: the carrier has flutes; and the flutes are extended into the tool head as the flute sections.

8. The carrier tool according to claim 1, wherein the tool head is configured to be fastened in the head retainer solely via clamping.

9. The carrier tool according to claim 1, wherein the carrier tool is a drilling tool.

10. A tool head for reversible fastening in a carrier for a carrier tool, the tool head extending in an axial direction along a central longitudinal axis, the tool head comprising: clamping surfaces extending in an axial direction; underhead bearing surfaces extending in an axial direction, via which the tool head sits on bearing surfaces of the carrier in a mounted state; flute sections; and torque transmission surfaces which: extend radially to an outer periphery of the tool head; and extend axially from the underhead bearing surfaces toward a front of the tool head; wherein, along a peripheral direction of the tool head, each of the underhead bearing surfaces extends between one of the torque transmission surfaces and one of the flute sections; wherein the underhead bearing surfaces are tilted at a tilt angle defined along a radial direction with respect to the central longitudinal axis.

11. The tool head according to claim 10, wherein: the underhead bearing surfaces are radially tilted in an outwardly sloped manner.

12. The tool head according to claim 9, wherein the tilt angle is in the range of 0.5 to 10.

13. The carrier tool according to claim 6, comprising: an insertion pin which extends axially away from the fastening pin, wherein the insertion pin and fastening pin are concentric with respect to one another; the insertion pin defining a smaller outer diameter than the fastening pin; the carrier including a receptacle for the fastening pin and a receptacle for the insertion pin; the receptacle for the fastening pin and the receptacle for the insertion pin being concentric with respect to one another.

14. A modular carrier tool comprising: a carrier for accommodating a tool head, the carrier comprising bearing surfaces extending along a radial direction with respect to a central longitudinal axis of the modular carrier tool; and a tool head comprising: underhead bearing surfaces which engage with the bearing surfaces of the carrier, when the tool head is accommodated in the carrier; flute sections; and torque transmission surfaces which: extend radially to an outer periphery of the tool head; and extend axially from the underhead bearing surfaces toward a front of the tool head; wherein, along a peripheral direction of the tool head, each of the underhead bearing surfaces extends between one of the torque transmission surfaces and one of the flute sections; wherein the bearing surfaces of the carrier and the underhead bearing surfaces are tilted at a tilt angle defined along a radial direction with respect to the central longitudinal axis.

15. The modular carrier tool according to claim 13, wherein the tool head is configured to be reversibly mounted at a front-end of the carrier.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) In the following text, an embodiment of the invention will be explained using the figures. These show:

(2) FIG. 1 a partially shown modular carrier tool shown in a side view,

(3) FIG. 2 the carrier tool according to FIG. 1 following a 90 rotation around a central longitudinal axis,

(4) FIG. 3 the carrier tool according to FIG. 1 in a sectional view through the central longitudinal axis,

(5) FIG. 4 the carrier tool according to FIG. 1 in an exploded view,

(6) FIG. 5 a top view onto the carrier tool according to FIG. 1,

(7) FIG. 6 a side view of a tool head, as it is inserted into the carrier tool according to FIG. 1,

(8) FIG. 7 a sectional view of the tool head according to FIG. 6 through the central longitudinal axis as well as

(9) FIG. 8 a top view onto the tool head according to FIG. 6.

DETAILED DESCRIPTION

(10) The modular carrier tool 2 shown in FIG. 1 extends along a central longitudinal axis 4 in axial direction 6. The carrier tool 2 is formed by a carrier 8 and a tool head 10, inserted into the carrier 8 in a reversible, exchangeable manner.

(11) The carrier 8 has a rearward clamping area or a clamping shaft (not shown in greater detail here) with which it is clamped into a machine tool during operation. A cutting area is adjoining this, into which flutes 12 for chip clearance are incorporated. At the front end face the carrier 8 has a head retainer 14, into which the tool head 10 is inserted. As indicated especially in the cross-section view according to FIG. 3, the head retainer 14 has a pin receptacle 16 for a fastening pin 18 of the tool head 10, Another receptacle for an insertion pin 22 of the tool head 10 adjoins concentrically and in the direction of the central longitudinal axis 4 to the pin receptacle 16. The pin receptacle 16 isas shown for example in FIG. 2cut through the flutes 12, so that it is open towards each of the flutes 12 in a radial direction. The pin receptacle 16 is outwardly delimited by lateral clamping webs 24. The clamping webs 24 extend in axial direction 6 to an open end face 26. In the front area, the clamping webs have a notch, so that on the one hand a bearing surface 28 recessed in an axial direction in relation to the open end face is formed.

(12) The section extending in axial direction 6 between the bearing surfaces 28 and the end faces 26 is formed as a section for torque transmission, which respectively forms surfaces for torque transmission 30. These are regularly spread out by the radial direction and the direction of extension. The axial direction of extension may be exactly the axial direction 6 oras shown particularly in FIG. 4 of the embodimentit may be a direction of extension in an angle relative to the axial direction. The surface for torque transmission 30 has two sections, which are arranged approximately in a V-shape to each other, as can also be seen particularly in this figure. As an alternative, only a surface section is formed, which at the same time is designed for positive locking extending in an axial direction for reliable pull-out protection.

(13) The tool head 10 is designed in correspondence to the design of the carrier 8. It has flute sections 32 that continue the flutes 12 in the tool head. They thereby cut across part of the fastening pin 18. Adjoining the fastening pin 18 in an axial direction 6 towards a forward tool tip is a widened section of the tool head 10, which forms the actual cutting area. At the transition to the fastening pin 18, the cutting area has radially extending underhead bearing surfaces 34, with which the tool head 10 is pressed against the bearing surfaces 28 of the head retainer 14 when in a mounted final state.

(14) In the mounted state, the clamping webs 24 exert a radial clamping force unto the fastening pin 18. The surface area of the fastening pin 18, at least segments thereof, therefore form clamping surfaces 35.

(15) Corresponding to the surfaces for torque transmission 30 of the carrier 8, the tool head 10 also has surfaces for torque transmission 36, which are designed approximately in V-shape in the embodiment in the side view. In a mounted state, they lie flat against the corresponding surfaces for torque transmission 30 of the carrier 8.

(16) The entire tool head 10 is formed approximately like a cone at its tip and has two radially extending main cutting edges 38, which are connected with each other by a chisel edge in the drilling center, so that the result is an approximately S-shaped curve of the cutting edge. In rotational direction, the main cutting edges 38 are each adjoined at the end-face by open surfaces in the form of conical shell segments. Engagement areas for an auxiliary tool are incorporated into these open surfaces, spaced apart from the main cutting edge 38. The auxiliary tool is used for inserting and especially loosening of the tool head 10.

(17) As shown especially in FIGS. 3 and 7, the bearing surfaces 28 as well as the underhead bearing surfaces 34 are disposed tilted at a tilt angle in direction to the central longitudinal axis 4. The tilt angle of the embodiment is preferably about 10. Generally, the tilt angle is preferably in a range between 0.5 and 15 and preferably in a range between 2 and 8.

(18) The surfaces 28, 34 are tilted at the same tilt angle , the tilt is hereby relative to the vertical of the central longitudinal axis 4. The surfaces 28, 34 are generally designed as circular ring segment surfaces. According to the tilt relative to the central longitudinal axis 4, they are therefore designed as conical shell segments. In the embodiment they are formed particularly as being tilted outwardly in a sloping manner. By means of this particular design it is accomplished that by inserting the tool head 10, wherein the same is tightened against the carrier 8, a force component K acting in a radial direction is exerted. Thus, the clamping webs 24 are pressed centrally, inwardly in the direction of the central longitudinal axis, whereby the radial clamping force is further increased.