WO2014167049A1

WO2014167049A1 - Stepper

Info

Publication number: WO2014167049A1
Application number: PCT/EP2014/057254
Authority: WO
Inventors: Doberenz SABINE; Horst Stroissnigg; Rolf Spangenberg
Original assignee: Hilti Aktiengesellschaft
Priority date: 2013-04-12
Filing date: 2014-04-10
Publication date: 2014-10-16
Also published as: DE102013206573A1

Abstract

Provided is a stepped drill bit (1) for processing a workpiece, in particular a metallic or mineral underlying surface, which stepped drill bit contains a shaft element (10) for holding the stepped drill bit (1) in a holding device of a machine tool, for example a drilling machine, and a conical drilling head (20). Furthermore, said conical drilling head (20) contains a first conical drilling portion (30) and a second conical drilling portion (40).

Description

Hilti corporation in Schaan

Principality of Liechtenstein

"Stepper"

INTRODUCTION

The present invention relates to a stepped drill for machining a workpiece, in particular a metallic or mineral substrate. The step drill contains a shaft element for holding the step drill in a holding device of a machine tool, for example a drill and a conical drill head.

Stepped drills of the type described above are well known and are mainly used to create cylindrical holes in sheets, plates, profiles and pipes of steel, brass, copper, aluminum, V2A steels, mineral materials and various plastics. Here, the holes can be used, for example, a threaded bolt inserted through it and fixed by means of a lock nut in the workpiece. Another possibility is that a self-tapping screw is screwed into the through hole. Different material thicknesses are usually used for the two different types of attachment, since the screwing of a self-tapping screw requires a greater material thickness to ensure a sufficient carrying length of the thread. It is therefore appropriate to use for the drilling of the respective through hole step drills, which have different lengths drill stages.

In DE-Gebrauchsmusterschrift 20 2008 000 368, for example, such a step drill is disclosed, in which a conical cutting part is positioned on a cylindrically shaped clamping shaft. The conical cutting part is formed by a plurality of step-like mutually arranged cutting sections. At the front end of the conical cutting part, a twist drill is mounted as a drill bit.

A disadvantage of the step drills of the prior art, however, is that no adjustment or no adaptation of the drilling stages can be made and thus often carried a variety of different step drills with correspondingly different drilling stages to the workplaces and attached to the machine tool for drilling different holes got to.

To solve the abovementioned disadvantages, a step drill according to the invention according to claim 1 is provided. Further advantageous embodiments of this step drill according to the invention are described in the dependent claims. Accordingly, a step drill for machining a workpiece, in particular a metallic or mineral substrate is provided, which includes a shaft member for holding the step drill in a holding device of a machine tool, such as a drill, and a conical boring head.

According to the invention, the conical boring head contains a first conical boring portion and a second conical boring portion.

According to an advantageous embodiment of the step drill according to the invention, a fixing device for fixing the first drilling portion relative to the second drilling portion may be provided, whereby the first drilling portion and the second drilling portion can be releasably connected to each other.

Moreover, according to a further advantageous embodiment, it may be possible for the fixing device to comprise an axial insertion element with a first insertion end and a second insertion end, an axial receiving element with a first receiving end and a second receiving end, and a holding device for receiving a holding element, wherein the holding device at least partially aligned perpendicular to the axial receiving element.

In order to prevent the first drilling portion from moving relative to the second drilling portion, it is further possible for the fixing apparatus to include a rotation lock.

According to a further advantageous embodiment of the present invention can be provided that the anti-rotation includes a polygonal Sicherungsseinsteckelement and a configured for receiving the Sicherungsseinsteckelements fuse receiving element. Due to the polygonal shape of the Sicherungsseinsteckelements and the corresponding fuse receiving element can effectively prevent the mutual rotation of these two elements to each other. The polygonal shape can be configured, for example, as a hexagon or in any other suitable form.

To ensure the largest possible contact surface between the fuse male and the fuse receiving element, can be provided according to a further advantageous embodiment of the inventive step drill that the Sicherungsseinsteckelement is positioned on the axial insertion element and the fuse receiving element on the axial receiving element.

In order to ensure that the first conical boring portion and the second conical boring portion are properly connected with each other, it is further possible to use the apparatus according to the invention Stepped drill a position device may be provided with a Positionseinsteckelement and a position-receiving element.

In addition, the position male member may be positioned at the first insertion end of the axial insertion member and the position receiving member at the first receiving end of the position receiving member.

According to an advantageous embodiment of the step drill according to the invention, a helical drill point with a point angle between 103 ° and 133 ° can be provided, whereby an optimal drilling performance can be achieved.

Furthermore, it can further be provided that a drilling groove with an angle between 8 ° and 22 °.

The present invention will be explained with reference to advantageous embodiments, in this case shows

1 shows a side view of a step drill according to the invention comprising a conical boring head with a first conical boring portion and a second conical boring portion as well as a shaft element;

FIG. 2 is an isometric view of the step drill according to the invention; FIG.

Fig. 3 is a side view of the second Kegelbohranteils;

4 shows an isometric view of the anti-rotation device with a polygonal securing male element and a securing receiving element designed to receive the securing male element and the positioning device with a position male element and a position-receiving element; and

5 is a sectional view through the first and second Kegelbohranteil with the anti-rotation device and the positioning device along the section line AA in Fig. 3rd

Embodiment

Fig. 1 and 2 shows the step drill 1 according to the invention for processing a (not shown) workpiece, in particular a metallic or mineral substrate. Editing can be, for example, the chipping of a rock.

The step drill 1 contains a shaft element 10 and a conical bore head 20.

The shaft member 10 is in the form of a cylinder and serves to hold the step drill 1 in a (not shown) holding device of a machine tool, such as a drill. The holding device of the machine tool can be configured as a chuck. The cylindrical shape of the shaft element 10 can also have a polygonal cross-section as an alternative to the round cross-section shown here.

The conical boring head 20 includes a first tapered portion 30, a second tapered portion 40, a fixture 50 and a central axis of rotation R. A first bore 22 and a second bore 24 are disposed opposite each other on the outer surface of the tapered bore 20. The two drill grooves 22, 24 thus extend along the first conical bore portion 30 and the second conical bore portion 40. An optimum angle for the bore grooves 22, 24 is between 8 ° and 22 °.

The first tapered portion 30 includes a first end 32 and a second end 34 and a plurality of different drilling stages 35, which are arranged stepwise in increasing form to each other. In addition, the first conical bore portion 30 at the first end 32 includes a helical drill bit 36. The optimum apex angle for the helical drill bit 36 is in a range between 103 ° and 133 °.

The second conical bore portion 40 includes a first end 42 and a second end 44 and a plurality of different drilling stages 45, which are also arranged stepwise in increasing shape to each other.

As shown in FIGS. 1 and 4, the fixing device 50 includes an axial insertion member 52 having a first insertion end 52a and a second insertion end 52b, and an axial receiving member 54 having a first receiving end 54a and a second receiving end 54b.

The fixing device 50 also serves to fix the first conical boring portion 30 relative to the second conical boring portion 40, so that the two conical boring portions 30, 40 are releasably secured together. Furthermore, the fixing device 50 includes a rotation lock 55, which in turn has a Sicherungsseinsteckelement 72 and a configured for receiving the Sicherungsseinsteckelements 72 fuse receiving element 74.

The securing male element 72 is positioned on the axial insertion element 52 and the securing receiving element 74 on the axial receiving element 54.

The securing male member 72 on the axial insertion member 52 is in the form of a hexagonal cylinder and includes a first insertion end 72a and a second insertion end 72b. The first insertion end 72a is positioned at the second end 34 of the first tapered portion 30. Furthermore, the securing male element 72 has a receiving region 80 for the retaining element 70 in the vicinity of the second insertion end 72b. The receiving area 80 is in the form of a wedge-shaped recess. The cooperation of the receiving area 80 and the holding element 70 will be described in more detail below.

The fuse receiving element 74 on the axial receiving element 54 is formed in the form of a hexagonal cylindrical bore in the second Kegelbohranteil 40 along the axis of rotation R and corresponds in cross section to the shape of the cross section of the Sicherungsseinsteckelements 72. This takes the fuse receiving element 74, the Sicherungsseinsteckelement 72 rotationally fixed in itself whereby also the first conical boring portion 30 is held in a rotationally fixed manner to the second conical boring portion 40.

The holding device 60 is designed in the form of a cylindrical bore and extends perpendicular to the axis of rotation R of the outer surface of the second Kegelbohranteils 40 to the axial receiving element 54 in the second Kegelbohranteil 40. The cylindrical bore of the holding device 60 in this case has a circular cross-section. Alternatively, the cross section may have any other suitable shape. As shown in Fig. 5, the holding member 70 is formed in the form of a cylindrical metal pin having a first holding member end 70a and a second holding member end 70b. The cross section of the holding element 70 is circular. Alternatively, however, the cross section may also have any other suitable shape. The cross-sectional shape of the retaining element 70 should correspond to the cross-sectional shape of the cylindrical bore of the holding device 60. The first holding element end 70a is in the form of a wedge. The wedge shape of the first holding element end 70a is designed such that it fits into the slot-shaped recess 80 of the axial insertion element 52 in a form-fitting manner.

Alternatively, according to further embodiments, the holding device 60 for receiving a retaining element 70 by a screw, in particular a Grub screw, a pressure pin, an O-ring, a sheet metal clip or the like can be realized.

Furthermore, the fixing device 50 contains a positioning device 100 with a position-insertion element 110 and a position-receiving element 120. The position-insertion element 110 is positioned on the first insertion end 52a of the axial insertion element 52. As shown in FIG. 4, the cross-section of the position male element 110 is in the form of a circle with the circle segment cut off. The position-receiving element 10 is in turn positioned at the first receiving end 54a of the axial receiving element 54. As also shown in FIG. 4, the cross-section of the position-receiving element 120 is in the form of a circle with a segment of a circle cut off. The cross-sectional shape of the position receiving member 120 corresponds to the cross-sectional shape of the position male member 110 so that the position male member 110 can be received in the position receiving member 120. The specific cross-sectional shape of the position male member 110 and the position-receiving member 120 enable the axial male member 52 to be fully inserted into the axial female member 54 in only one orientation, thereby properly connecting the first tapered male member 30 to the second tapered male member 40.

Due to the configuration of the conical boring head 20 with a first conical boring portion 30 which can be released from the second conical boring portion 40, it is possible to replace the first conical boring portion 30 in a first embodiment by a conical boring portion in another embodiment. The two embodiments of the first conical bore portions 30 may differ from each other in particular in terms of shape, height, diameter and number. By attaching differently configured conical boring portions, a first worn or worn conical boring portion 30 can thus be exchanged or a first conical boring portion 30 can be exchanged with another, i. smaller or larger, drill stages are used.

Claims

claims

Step drill (1) for machining a workpiece, in particular a metallic or mineral substrate, containing

- A shaft member (10) for holding the stepped drill (1) in a holding device of a machine tool, such as a drill; and

- a (grooved) conical drilling head (20)

characterized in that the conical boring head (20) includes a first cone boring portion (30) and a second cone boring portion (40).

Step drill (1) according to claim 1,

characterized in that a fixing device (50) for fixing the first conical boring portion (30) relative to the second conical boring portion (40) is provided.

Step drill (1) according to claim 2,

characterized in that the fixing device (50)

an axial insertion element (52) having a first insertion end (52a) and a second insertion end (52b),

- An axial receiving element (54) having a first receiving end (54 a) and a second receiving end (54 b), and

a holding device (60) for receiving a holding element (70)

contains, wherein the holding device (60) is at least partially aligned perpendicular to the axial receiving element (54).

Step drill (1) according to one of claims 1 to 3,

characterized in that the fixing device (50) includes a rotation lock (55).

Step drill (1) according to claim 4,

characterized in that the anti-rotation device (55) contains a polygonal fuse plug-in element (72) and a fuse receiving element (74) designed to receive the fuse plug-in element (72). Step drill (1) according to claim 5,

characterized in that the securing male member (72) is positioned on the axial insertion member (52) and the fuse receiving member (74) is on the axial receiving member (54).

Step drill (1) according to one of claims 1 to 6,

characterized in that a positioning device (100) is provided with a position-insertion element (110) and a position-receiving element (120).

Step drill (1) according to claim 7,

characterized in that the position male member (110) is positioned at the first insertion end (52a) of the axial insertion member (52) and the position receiving member (120) is positioned at the first receiving end (54a) of the axial receiving member (54).

Step drill (1) according to one of claims 1 to 8,

characterized in that a helical drill bit (36) is provided with a point angle between 103 ° and 133 °.

0. Step drill (1) according to one of claims 1 to 9,

characterized in that a drilling groove (22, 24) is provided at an angle between 8 ° and 22 °.