EP2303494A2

EP2303494A2 - Tool which can be axially adjusted

Info

Publication number: EP2303494A2
Application number: EP09780273A
Authority: EP
Inventors: Peter Frank; Jens QUERENGÄSSER
Original assignee: Sandvik Intellectual Property AB
Current assignee: Sandvik Intellectual Property AB
Priority date: 2008-07-18
Filing date: 2009-07-07
Publication date: 2011-04-06
Also published as: WO2010006965A2; US20110182676A1; WO2010006965A3; DE102008040562A1; CN102089104A; JP2011528285A; KR20110033146A

Abstract

The invention relates to a tool for machining for boring or milling, comprising a base body (2) that can be rotated about a tool axis and a holding element (16) having a cutting insert seat which holding element can be fastened to the base body (2). The aim of the invention is to devise a tool that can be easily produced at low cost and that allows the axial adjustment of the cutting insert in relation to the base body to a larger extent than according to the prior art. The tool according to the invention is characterized by an adjusting mechanism for axially adjusting the holding element (16) in relation to the base body (2).

Description

Tool with axial adjustability

The present invention relates to a tool for machining for drilling or milling with a rotatable about a tool axis tool body and a fastened to the tool body holding member with a cutting board seat for a cutting plate. Such a tool is known for example from DE 103 15 394 A1. This boring tool has a drive shaft and serves, for example, for widening a pre-machined bore.

During machining, the tool rotates about a central axis, also called tool axis or drilling axis, which is substantially perpendicular to the end face of the tool body. When the tool is immersed in a pre-machined bore, the cutting plates received on the retaining element engage with the inner contour of the bore, expand it and, if necessary, carry out the finishing of the inner surfaces.

For some drilling tools, the diameter of the drill can be varied by moving the retaining elements in the radial direction, i. perpendicular to the tool axis, can be moved to a limited extent.

There are applications such as e.g. in stepped drilling, where multi-stage machining is provided. For example, successive holes of different diameters, frequent holes with countersinks, or combinations of different holes and countersinks may be desired. In order to minimize the machine time, combination tools are then used in which the inserts are set differently in both the radial and in the axial direction.

In such combination tools, the cutting edge seats are indeed spaced apart in the axial direction, an axial adjustability is not possible here.

There are already tools in which the inserts can be adjusted in the axial direction to a limited extent. For this purpose, a wedge or a washer is used between the cutting plate on the one hand and holding element on the other hand, which ensures the axial adjustment of the cutting plate. However, this limited axial adjustability weakens the support of the insert in the seat, which is designed only for a specific position of the insert. To the inserts are often used, so that due to appropriately worn cutting inserts when turning the indexable insert, the axial adjustment is no longer true.

It is therefore an object of the present invention to provide a tool that is simple and inexpensive to manufacture and allows the axial adjustment of the insert with respect to the tool body in comparison with the prior art in large scale.

According to the invention this object is achieved in that an adjusting device is provided for the axial adjustment of the holding element with respect to the tool body.

In contrast to the devices of the prior art, the invention proposes to adjust the holding element together with the cutting board seat and thus together with the cutting plate axially and not just the cutting plate.

Of course, a slider body could be provided, which is fastened to the tool body and in the radial direction relative to the tool body between two positions back and forth movable, wherein the holding member is attachable to the slider body. For radial and axial adjustment of the cutting plate with respect to the tool base body, therefore, the slider body is initially set in the radial direction relative to the tool body and then set the holding member relative to the slider body in the axial direction.

The adjusting device preferably has an adjusting screw, which is arranged in a first threaded bore in the tool body or in the slider body and optionally applied via a contact piece on a contact surface of the support member, so that when turning the adjusting screw in the threaded bore, the holding member axially against the slider body or the tool body is moved.

In a preferred embodiment, the first threaded hole with the tool axis includes an angle between 15 ° and 165 °, preferably between 45 ° and 135 °, more preferably between 60 ° and 120 °, and most preferably about 90 °.

The contact surface of the holding element or a corresponding with the contact surface of the holding element engaging stop surface of the adjusting screw or the investment piece preferably closes with the first threaded hole an angle between 0 ° and 90 °, more preferably between 0 ° and 20 ° and more preferably between 10 ° and 20 °. Furthermore, in some embodiments, a spring element may be provided, which biases the holding element in a specific axial position.

In a further preferred embodiment, the holding element has a second threaded bore and the slider body or the tool body has a through hole, so that the holding element can be fixed with a through the through hole in the second threaded hole engaging locking screw on the slider body or on the tool body.

Advantageously, the through hole is formed as a slot.

In a further preferred embodiment, the retaining element has a web-shaped projection and the slider body or the tool base body has a corresponding groove, the second threaded bore preferably being arranged in the web-shaped projection and the through-hole being arranged in the groove.

Furthermore, a stop surface for the locking screw head can be provided on the slider body or on the tool body, wherein the stop surface with the groove bottom an angle of> 0 °, preferably between 1 ° and 20 ° and particularly preferably between 1 ° and 10 ° includes.

The second threaded hole in a preferred embodiment with the radial direction at an angle between 15 ° and 165 °, preferably between 45 ° and 135 ° and more preferably between 40 ° and 50 °.

In a further particularly preferred embodiment, an extension arm is provided which is fastened on the one hand to the tool base body and on the other hand carries the cutting plate holder, wherein the cutting plate holder can be fastened to the extension arm at at least two positions spaced apart from one another in the radial direction.

Further advantages, features and possible applications will become apparent from the following description of a preferred embodiment and the accompanying figures. Show it:

1 shows a perspective view of an embodiment of the invention, FIG. 2 shows a side view of the embodiment of FIG. 1,

FIG. 3 shows a further perspective view of the embodiment of FIG. 1,

FIG. 4 shows a view from below of the embodiment of FIG. 1,

FIG. 5 shows a plan view of a slider body, - -

FIG. 6 shows a side view of the slider body of FIG. 5,

Figure 7 is a sectional view taken along the line A-A in Figure 6 and

FIG. 8 is a sectional view taken along the line B-B of FIG. 5.

FIG. 1 shows a perspective view of an embodiment of the invention. A boring tool 1 has a tool base 2, which has an interface 3 to a corresponding drive. The interface 3 consists here of a steeply tapered shaft 3, on whose end facing the tool base body a gripping groove 4 and a flange 5 are arranged for a- xialen support. The interface can also be designed as a separate component that can be connected to the tool base body 2. In this case, the interface expediently has an axially over the flange 5 projecting centering pin (not shown), which can engage in a corresponding central bore (not shown) in the tool body.

The tool base body here has a wheel-shaped section 6, which is connected to an inner hub section via corresponding spoke sections 7. At the tool body 2 and at the spoke portions 7 extension arms 8 are attached. The embodiment shown has four spoke sections 7, to each of which an extension arm 8 is attached. On the extension arm 8, an insert holder 9 is accommodated, which has a web-like projection 10 which lies in a groove 11 of the extension arm 8.

Figure 2 shows a side view of the embodiment of Figure 1. It can be seen here that the insert holder 9 has a seat for a cutting plate 12 which is held by means of a clamp 13 on the cutting board holder. In the extension arm 8 shown in the middle in Figure 2, it can best be seen that the web-like projection 10 is slightly inclined, resulting in better axial contact during operation. The screw 14, which is arranged within the web-like projection 10, serves for the radial displacement of the insert holder 9 within the groove 11 of the extension arm 8.

In Figure 3 is a perspective view from below and in Figure 4 is a plan view from below of the embodiment of Figures 1 and 2 is shown. It can be clearly seen here that the tool body 2 consists of an inner hub portion, a wheel-shaped portion 6 and four spoke sections 7. The extension arms 8 are screwed onto the spoke sections 7. The insert holder 9, which in turn consists of a slider body 15 and a holding element 16 received therein, which comprises the cutting plate seat, has at least one elongated hole, in the example shown, three elongated holes 17 can be seen. The extension arm 8 has a corresponding number of threaded holes 18, so that the insert holder 9 due - -

the slots 17 can be adjusted in the radial direction. This is done, as already mentioned, with the aid of the adjusting screw 14 (see Figure 2).

In the view of Figure 4 can be clearly seen that the extension arm 8 has a second set of threaded holes 18. The insert holder 9 can therefore be completely detached from the extension arm 8 and be re-attached by means of the additional threaded holes at a radially spaced position. Even in the new position allow the slots 17 a certain radial displacement of the insert holder relative to the extension arms. 8

However, in order to expand the range of drill diameters, not only the tip holder can be displaced relative to the extension arm, but it is also possible to use a different shaped extension arm 8 or a differently shaped tool body 2. Furthermore, it is possible to use tool body with a different number of spoke sections. In addition, it is not absolutely necessary that the individual spoke sections are arranged equidistantly in the circumferential direction. On the contrary, in a so-called differential division has been found that vibrations that might occur in operation, can be minimized.

Figure 5 shows a plan view of a slider body 15. The slider body 15 forms together with the support member 16, the cutting plate holder 9. The slider body 15 has on its underside a web-like projection 10 which can be inserted into a groove 11 of the extension arm 8. To fasten the slider body 15 on the extension arm 8 serve three screws which engage in corresponding threaded holes of the extension arm. They engage in the attachment through corresponding slots 17 of the slider body 15, so that when the screws are released, the slider body 15 can be moved radially between two positions back and forth. Once the slider body 15 is in the desired position, it can be secured to the extension arm 8 by means of the screws.

The holding element 16 has a clamp 13 with which the cutting plate 12 can be held in the holding element 16. The slider body 15 has a groove 28 in which a corresponding web 27 of the retaining element 16 engages. For fixing the retaining element 16 in the groove 28, a fastening screw 29 is used.

As can be seen in particular in FIG. 8, which shows a sectional view along the line BB, the fastening screw 29 in the slider body 15 has some play. The angle α shown in Figure 8 between the groove bottom of the groove 28 and the contact surface for the head of the fastening screw 29 is preferably> 0 ° and is best in the range between 0 ° and 10 °. Figure 7 shows a sectional view along the line AA of Figure 6. It can be seen that the holding member 16 has on its underside a chamfer 33 and a V-shaped recess. The slider body 15 has a spring element 30, which is designed as a resilient pressure piece, which projects under spring action into the recess provided for the retaining element 16. Furthermore, a piece of equipment designed as a wedge 31 is fastened to the slider body 15 with the aid of an adjustment screw 32. When inserting the holding element 16 in the groove 28 of the slider body 15, the holding element 16 is inserted in Figure 7 from bottom to top in the slider body 15. In this case, first the resilient pressure piece 30 will engage the chamfer 33. By the chamfer 33, the resilient pressure member 30 is pressed into the slider body 15 (in the figure 7 to the left) until the V-shaped recess with respect to the pressure piece 30 comes to rest. This situation is shown in FIG. In this situation, the holding member 16 abuts on the wedge 31. With the help of the adjusting screw 32, the wedge 31 can be moved, whereby an axial adjustment of the holding element 16 takes place. By the wedge 31 a finer adjustment is possible.

The spring element 30 is essentially to push the retaining element 16 along the groove 28 in the direction of the wedge 31 when the wedge 31 is reset. As soon as the axial position of the retaining element is reached, the retaining element 16 can be fixed on the slider body 15 with the aid of the fastening screw 29.

It is understood that all features as they emerge from the present description, the drawings and the claims for a person skilled in the art, even if they have been described concretely only in connection with certain other features, both individually and in any combination with other of the characteristics or groups of features described herein are combinable, unless this has been expressly excluded or technical circumstances make such combinations impossible or pointless. This also applies to any feature combinations within any of the dependent claims. The brevity and readability of the description is omitted here for the comprehensive, explicit representation of all conceivable combinations of features.

LIST OF REFERENCE NUMBERS

1 boring tool

2 tool body

3 interface / steep taper shank

4 gripping groove

5 flange

6 wheel-shaped section

7 spoke sections

8 extension arms

9 insert holder

10 lead

1 1 groove

12 cutting plate

13 clamp

14 adjusting screw

15 slider body

16 retaining element

17 long holes

18 threaded holes

24 second threaded hole

25 through hole

26 first tapped hole

27 footbridge

28 groove

29 fixing screw

30 spring element

31 wedge

32 adjusting screw

33 chamfer

Claims

Patent claims

1. A tool for machining for drilling or milling with a tool axis about a tool axis rotatable tool body (2) and fastened to the tool body (2) holding element (16) with a cutting edge seat, characterized in that an adjusting device for axial adjustment of the holding element (16 ) is provided with respect to the tool body (2).

2. Tool according to claim 1, characterized in that a slider body (15) is provided, which is fastened to the tool base body (2) and in the radial direction relative to the tool base body (2) between two positions reciprocally movable, wherein the holding element (16) on the slider body (15) can be fastened.

3. Tool according to claim 1 or 2, characterized in that the adjusting device has an adjusting screw (32) which is arranged in a first threaded bore (26) in the tool base body (2) or in the slider body (15) and optionally via a contact piece (31 ) abuts a contact surface of the holding element (16), so that when turning the adjusting screw (32) in the threaded bore (26), the holding element (16) axially against the slider body (15) or the tool base body (2) is moved.

4. Tool according to claim 3, characterized in that the first threaded bore (26) with the tool axis an angle between 15 ° and 165 °, preferably between 45 ° and 135 °, more preferably between 60 ° and 120 ° and best of about Includes 90 °.

5. Tool according to claim 3 or 4, characterized in that the contact surface of the holding element (16) and / or a corresponding with the contact surface of the holding element (16) coming into engagement abutment surface of the adjusting screw (32) or the abutment piece (31) with the first threaded bore (26) encloses an angle between 0 ° and 90 °, preferably between 0 and 20 ° and particularly preferably between 10 ° and 20 ° or include.

6. Tool according to one of claims 3 to 5, characterized in that a spring element (30) is provided, which biases the holding element (16) in a specific axial position.

7. Tool according to one of claims 1 to 6, characterized in that the holding element (16) has a second threaded bore (24) and the slider body (15) or the factory basic body (2) has a through hole (25), so that the holding element (16) with a through the through hole (25) in the second threaded bore (24) engaging locking screw (29) attached to the slider body (15) or on the tool body (2) can be.

8. Tool according to claim 7, characterized in that the through hole (24) is formed as a slot.

9. Tool according to claim 7 or 8, characterized in that the holding element (16) has a web-shaped projection (27) and the slider body (15) or the tool base body (2) has a corresponding groove (28), wherein the second threaded bore (24 ) are arranged in the web-shaped projection (27) and the through-bore (25) in the groove (28).

10. Tool according to claim 9, characterized in that a stop surface for the locking screw head on the slider body (15) or on the tool body (2) is provided, wherein the stop surface with the groove bottom an angle (α)> 0 °, preferably between 1 ° and 20 ° and more preferably between 1 ° and 10 °.

11. Tool according to one of claims 7 to 10, characterized in that the second threaded bore (24) with the radial direction forms an angle between 15 ° and 165 °, preferably between 25 ° and 135 ° and more preferably between 40 ° and 50 ° ,

12. Tool according to one of claims 1 to 11, characterized in that an extension arm (8) is provided, which is fastened on the one hand to the tool base body (2) and on the other hand carries the cutting plate holder (9), wherein the cutting plate holder (9) at least two radially spaced apart positions on the extension arm (8) can be fastened.