WO2014195174A1

WO2014195174A1 - Tool for machining a workpiece

Info

Publication number: WO2014195174A1
Application number: PCT/EP2014/060868
Authority: WO
Inventors: Gerrit Brand
Original assignee: Kwb Tools Gmbh
Priority date: 2013-06-03
Filing date: 2014-05-26
Publication date: 2014-12-11
Also published as: DE202013004984U1

Abstract

The invention relates to a tool (1) for machining a workpiece (2), comprising a fastening segment (4) for fastening the tool (1) to a drivable tool spindle of a machine tool (6) such that the tool (1) can be moved back and forth in an oscillating manner about an axis of rotation (8) and comprising a machining segment (10) having teeth (14). A longitudinal axis (12) of the tool (1) is oriented substantially orthogonal to the axis of rotation (8). The teeth (14) are formed asymmetric with respect to the longitudinal axis (12) of the tool (1). The machining segment (10) is also formed asymmetric with respect to the longitudinal axis (12) of the tool (1).

Description

C o m p u m p u n d a n d a n d ia n ts

We c ks

The present invention relates to a tool for machining a workpiece, having a fixing portion for fixing the tool to a drivable tool spindle of a machine tool, so that the tool about an axis of rotation oscillating back and forth, and a machining portion with a toothing, wherein a Longitudinal axis is oriented substantially orthogonal to the axis of rotation. Such a tool is in a preferably hand-guided

Machine tool clamped by which the tool is placed in an oscillating motion. Due to the oscillating movement of the tool, the toothing arranged in the machining section of the tool is moved up and down or back and forth, so that upon engagement of the toothing in a workpiece, for example in a wood or plastic plate, by means of a metal cutting or

Sawing a sawing or cutting edge or groove is incorporated into the workpiece.

Tools that are used in such a hand-held oscillating driven machine tool, are colloquially often as

Saw blades called. Saw blades are known with respect to their longitudinal axis mirror-symmetrical basic shape. This basic form requires that the

Gearing is formed mirror-symmetrically with respect to the longitudinal axis. The known saw blades further have a toothing arranged on a straight line, wherein this straight line is orthogonal to the longitudinal axis. Saw blades of this type are also known, for example, from EP 1 481 750 B9. In addition, special forms of such saw blades are known, e.g. from the

DE 84 23 004 U1, which discloses a cutting blade for severing the adhesive layer of a glued vehicle window.

The US 5,697,835 A discloses numerous different knife shapes for oscillating tool drives, such as triangular, circular, trochoidenförmige or trapezoidal blades with Au ßenverzahnungen. A cutting tool for an oscillating rotary motion machine tool is furthermore known from EP 1 625 909 A1. The structure of the tool and its toothing is different in each contour

symmetrical to a tool longitudinal axis. Further cutting variants of such tools, each with symmetrical

Gear contours are apparent from DE 100 47 212 A1 and DE 10 201 1 078 488 A1.

Known tools have disadvantages in practical use.

So that a workpiece can be processed by means of the known saw blades, it is necessary to start the sawing process on the workpiece edge, so that in this case the hand-held machine tool can be kept in a comfortable working position for the machine operator. It has been shown that a continuous sawing with such hand-held machine tools is possible only in an angled or inclined orientation of the machine tool. Another disadvantage of the known saw blades results from the

limited machinability of workpieces where the tool should not penetrate into the area under the workpiece. Such editing of a workpiece is hardly or not possible by means of a pleasant for the operator body or hand and / or arm posture, since the inclined guiding the machine tool parts of the processing portion of the saw blade, such as parts of the

Gearing, through the oscillating motion repeatedly dive through the workpiece and leave the workpiece on its underside.

Furthermore, it is with the known saw blades due to the opposite

Longitudinal axis orthogonal teeth not possible to start the sawing process in the middle of a workpiece, so not at the edges, without the

hand-held machine tool is guided at a substantially right angle to the workpiece. This leads to a disadvantageous posture of the

Operator and leads in practice to rapidly occurring complaints in the musculoskeletal system. This has a negative effect on the work result or the quality of the cutting or sawing edges or grooves produced by the machine tool. In these cases, it may even come to the point where the machine operator has to interrupt the work, so that an effective and economical execution certain sawing work with the saw blades known from the prior art is not possible.

Object of the present invention is to provide a tool that is particularly suitable for the formation of longitudinal sections and / or grooves while avoiding the above disadvantages.

The object is achieved by a tool of the aforementioned type, wherein the toothing is formed asymmetrically relative to the longitudinal axis.

The asymmetric design of the teeth allows the

Machine operator to guide the machine tool in a pleasant posture for him, so that it is possible through the opposite to the longitudinal axis asymmetric gearing to incorporate grooves in workpieces, without having to align the machine tool orthogonal to the workpiece. By the for the

Machine operator advantageous alignment of the machine tool, the efficiency and the effectiveness of such workpiece machining increases. The ability to perform the machine tool in longitudinal sections at an inclined angle, also improves the work result, as complaints in the musculoskeletal system of the operator are avoided. The longitudinal axis of the tool is a central axis which, after the clamping of the tool into the tool spindle of the machine tool, preferably runs parallel to the longitudinal axis of the machine tool.

According to the present invention, the toothing is on the one hand formed asymmetrically, wherein the asymmetry is related to the longitudinal axis. In addition, the entire processing section of the tool is asymmetrical, this asymmetry is again related to the longitudinal axis of the tool. In combination with an asymmetric design with respect to the longitudinal axis

Gearing is thus significantly improved the feasibility of longitudinal cuts on workpieces by means of a tilted machine tool.

In a first preferred embodiment of the tool according to the invention, the toothing is divided by the section plane drawn up by the axis of rotation and the longitudinal axis into two unequal parts. Due to the unequal distribution of

Dovetailing with respect to the above-mentioned cutting plane becomes the inclinability of the machine tool when performing longitudinal cuts or when producing grooves favors further, so that the situation-related disadvantages when working with such oscillating driven machine tools are further reduced.

In a second preferred embodiment, the one part of the two unequal parts of the toothing forms the entirety of the toothing. This means that the entire toothing lies on one side of the section plane drawn up by the rotation axis and the longitudinal axis, so that no toothing can be found on the other side. This allows a further inclination of the

Machine tool when making grooves, so that the above

Disadvantages further reduced or eliminated. In a further embodiment of the tool according to the invention, the asymmetric basic shape of the machining section with respect to the longitudinal axis of the tool is caused by a lateral recess in the machining section. The lateral recess is arranged at the region of the processing section which would prevent working with a tilted machine tool in certain embodiments of the tool.

The tool according to the invention is advantageously further developed in that the recess extends from the toothing to a side edge of the tool. Preferably, a curved edge is formed by the toothing up to a side edge by the lateral recess on the tool. Furthermore, the recess can also produce a rectilinear tool edge between the toothing and a side edge of the tool.

In a further preferred embodiment, the toothing is arranged at least partially on at least one straight line which does not run orthogonally to the longitudinal axis of the tool. In particular, the production of

Longitudinal cuts or grooves characterized in that the straight line on which the

Gearing is arranged, acute-angled to the longitudinal axis. The inclination of the toothing straight line with respect to the longitudinal axis of the tool is partly due to the intended inclination of the machine tool.

The tool according to the invention is advantageously further developed in that the toothing is arranged at least partially on two straight lines, which are arranged obliquely to each other in the same plane. That is, the gearing follows an angled course within the same plane. By the arrangement of Gearing on two obliquely arranged straight lines can be achieved an improved result by the fact that the machine operator can hold the machine at different angles of inclination, while the toothing is in engagement with the workpiece. This can in particular play a role in the preparation or discontinuation of the toothing of the workpiece, as often a constant inclination angle of the machine tool can not be met by the often often performed in practice as jerky movements.

In a further preferred embodiment of the invention

Tool teeth, the teeth are at least partially arranged on a curved curve. Preferably, the toothing is additionally arranged at least partially on a straight line. This further increases the usable tilt angle of the

Machine tool opposite the workpiece, so that under different

Tilt angles good work results can be achieved. This can be particularly advantageous when producing particularly long grooves or longitudinal cuts in the workpiece, since the inclination angle of the machine tool, which is pleasant for the machine operator, is typically not constant when the machine tool is pulled over the workpiece by the musculoskeletal system of the human body. The toothing lying on a curved or curved curve thus improves the feasibility and feasibility of longitudinal cuts, in particular of long longitudinal cuts in the workpiece.

In a particularly preferred embodiment of the tool according to the invention, the processing section has one or more recesses which extend over the entire thickness of the tool. By means of this in the

Processing section arranged recesses, the chip removal is improved during the machining process, so that the production of grooves is simplified and higher-quality work results can be generated.

Particularly advantageous is a recess which is increasing or increasing in the direction of the toothing. This means, for example, recesses in the form of a triangle, which are aligned such that one side is substantially parallel to the toothing.

In the presence of a plurality of such recesses, it is particularly advantageous if the sum of the contents of the surfaces of the recesses and / or the number of recesses in a region which is arranged closer to the toothing, is greater than in a region which is farther from the toothing. If the recesses are designed, for example, as cylindrical bores, it is particularly advantageous if they are formed on straight lines running parallel to the toothing, and on the straight line, which is closer to the toothing, there is a larger number of cylindrical bores than on a straight line further away from the toothing. Furthermore, the recesses can also be designed as any (free) form.

In a further preferred embodiment of the invention

Tool are the processing section and the attachment portion arranged on two different levels. It is particularly advantageous if the two planes are aligned with each other approximately parallel and aligned in the direction of the axis of rotation or arranged. As a result, the accessibility of certain workpiece sections can be improved, so that grooves or

Longitudinal cuts in hard to reach workpiece areas can be incorporated or introduced.

The tool according to the invention can be advantageously further developed by being integrally formed. It is to be understood by a one-piece training that the tool was already made as one piece during the manufacturing process, so that no subsequent joining processes or molding of other tool parts by further manufacturing processes are necessary. One-piece tools according to this definition can be produced for example by casting, forging, forming or by machining processes.

Furthermore, the tool according to the invention can also be developed advantageously in that it is designed in several parts, preferably in two parts. It is particularly advantageous if the attachment portion and the

Processing section are arranged on different parts. This may, depending on the embodiment, for example, lead to a simplified manufacturing process and thus to reduced costs. The separately manufactured parts of the tool can be processed in a processing step, e.g. be joined together by joining.

In a further preferred embodiment of the invention

Tool are the machining section and / or the toothing made of hardened steel. By increasing the mechanical resistance of the Tool can increase the life of the tool. For example, curing methods based on heat treatment or application of coatings or pollinations come into question here.

Furthermore, the tool according to the invention is further developed by the machining section and / or the toothing being diamond-coated or

are strewn with diamonds. Likewise, the machining section and / or the toothing may be carbide-sprinkled. By providing a diamond coating and / or a diamond coating and / or a hard metal sputtering, the wear of the tool can be further reduced, so that in this way the life of the tool is increased.

In a particularly preferred embodiment of the tool, the entire toothing is divided into two unequal parts by the cutting plane subtended by the axis of rotation and the longitudinal axis, wherein the entire toothing forms one of the two unequal parts and is partially arranged on at least one straight line which is not orthogonal, but at an acute angle to the longitudinal axis. The processing section is asymmetrical with respect to the longitudinal axis of the

Tool formed, and has a lateral recess which extends from the toothing to the side edge and forms a curved edge of the toothing to a side edge of the tool, wherein the processing portion has a plurality of recesses which extend over the entire thickness of the tool , The sum of the contents of the surfaces of the recesses and / or the number of the recess is / are greater in the region which is closer to the toothing than in the region which is further spaced from the toothing. In this case, the machining section and the fastening section are arranged on two different, parallel and spaced-apart planes in the direction of the axis of rotation.

In the following, the invention will be explained in more detail with reference to embodiments of a tool according to the invention, from which further inventive features, with reference to the drawings described below. The figures illustrate and illustrate non-limiting embodiments of the present invention in its details,

Uses and functions. Hereby show:

Fig. 1 shows an embodiment of the tool according to the invention in

Connection with a hand-held machine tool in a side view; Fig. 2 shows an embodiment of the tool according to the invention in

Connection with a hand-held machine tool in engagement with a workpiece in plan view;

Fig. 3a shows the embodiment of the tool of Fig. 2 without

Machine tool in plan view;

3b shows the embodiment of the tool of Fig. 2 and Fig. 3a in a perspective view;

4 shows an embodiment of the tool in plan view.

5 shows a further embodiment of the tool in plan view; and FIG. 6 shows a further embodiment of the tool in plan view.

As shown in FIG. 1, the tool 1 according to the invention is connected to a hand-held machine tool 6 in such a way that the tool can execute an oscillatory rotational movement about the axis of rotation 8. In this case, the tool 1 is fastened to the fastening section 4 on the spindle of the machine tool 6. Furthermore, the tool has a processing section 10. This processing section 10 is designed as a flat plate, which has at its one end a toothing 14 and is connected at its other end to the mounting portion 4.

The mounting portion 4 is arranged in a first plane, which is parallel to the plane in which the processing section 10 is arranged and spaced in the direction of the axis of rotation 8 thereto. The illustration (FIG. 1 and / or FIG. 2) further indicates the longitudinal axis 12 of the tool 1 arranged in the plane of the processing section 4. It is particularly clear in this illustration that the longitudinal axis 12 and the axis of rotation 8 of the tool 1 are aligned approximately orthogonal to one another. The sectional plane drawn up by these two axes divides the toothing 14 into two unequal parts (not visible in this illustration, see Fig. 3 et seq.).

The illustration of FIG. 2 shows an embodiment of the tool 1 according to the invention in plan view in engagement with a workpiece 2. In this illustration, the mounting portion 4 is partially covered by the machine tool 6. Of the Machining portion 10 of the tool 1 has at one end a toothing 14, which engages in the workpiece 2 at least partially. Also shown are the recesses 22, which are also arranged on the processing section 10 in the immediate vicinity of the toothing 14 in order to effectively dissipate the chip or chips produced during the sawing process, so that a high-quality machining of a workpiece 2 is made possible.

The illustrated recesses 22 are each formed by circular through holes, which are arranged parallel to the teeth 14 in two rows, wherein the sum of the contents of the surfaces of the recesses 22 and the number of recesses in a region which is closer to the toothing 14 is larger than in an area that is farther from the teeth 14.

The sectional plane raised by the axis of rotation 8 and the longitudinal axis 12 divides the toothing 14 into two unequal parts. Furthermore, it is at this

Embodiment of the case that the one part has the entirety of the toothing 14 and the other part has no part of the toothing 14. The asymmetrical with respect to the longitudinal axis 12 basic shape of the processing section 10 allows the guiding of the machine tool 6 in the illustrated inclined angle.

The asymmetric basic shape of the processing section 10 is caused by the lateral recess 24. The lateral recess 24 extends from the toothing 14 to the side edge 26b of the tool 1, whereby a curved tool edge 28 is formed between the toothing 14 and the side edge 26b. The edges of the tool that are not caused by the lateral recess 24 extend mirror-symmetrically with respect to the longitudinal axis 12. As a result, the machining portion is bounded laterally by the side edges 26a and 26b, and the teeth 14 are formed between the side edges 26a and 26b at the one end of the machining portion 10. The for the

Machine operator pleasant inclination of the machine tool 6 is also made possible by the lateral recess 24. The lateral recess 24 forces a laterally bent basic shape of the processing section 10.

The plan view of an embodiment according to the invention of the tool 1 shown in FIG. 3 a shows the arrangement of the toothing 14 along a straight line 16. This straight line 16 does not run orthogonally, but obliquely or inclined or Such an arrangement of the toothing 14 further improves the machining process, since this shape of the toothing 14 optionally also an inclined orientation of the machine tool during the

Machining process allowed. Furthermore, the embodiment of the fastening portion 4 is shown in this illustration. This has a central passage opening, which is directly connected to the tool spindle of the machine tool 6 (not shown) and transmits the oscillating rotational movement of the tool spindle to the tool 1. Furthermore, the fastening section 4 has peripheral recesses 32, which are arranged on a circular path around the axis of rotation 8.

The perspective illustration in FIG. 3b shows that the machining section 10 and the fastening section 4 are arranged on two different, mutually approximately parallel and in the direction of the axis of rotation 8 (not illustrated).

extending levels are arranged. Furthermore, the illustrated embodiment of the tool according to the invention 1 is designed in two parts, wherein the

Processing section 10 and the attachment portion 4 are arranged on different parts, which have been joined together in a transition region.

However, tools according to the invention can also be embodied in one piece, so that it is not used for joining individual parts during the production process

Individual components comes.

The toothing of the tool illustrated in FIGS. 3 a and 3b is arranged partly on a straight line 16 and partly on a curved or curved curve 20.

The exemplary embodiment illustrated in FIG. 4 has a tooth system 14 which is arranged entirely on a straight line 16. The straight line 16 is arranged at an angle to the longitudinal axis 12, in the embodiment at an angle of less than 90 °.

The toothing 14 of the embodiment of the illustrated in Fig. 5

Tool has a first toothing straight line 16 and a second toothed straight line 18, which are connected to each other via a tooth curve 20. The straight line 16 is arranged at an angle to the longitudinal axis 12, in

Embodiment at an angle of less than 90 °. The straight line 18 is in one Angle to the straight line 16 arranged in the embodiment at an angle of slightly more than 90 °.

The illustrated in Fig. 6 embodiment of the tool 1 has a

Gearing 14, which is arranged on a curved or curved curve 20. A curved or curved configuration of the toothing 14 allows the operator to be able to achieve a good sawing result, even with minor inclination changes of the machine.

It should finally be noted that in the accompanying figures identical components are each designated by the same reference numerals, without this being explained again separately in each case.

LIST OF REFERENCE NUMBERS

1 tool

2 workpiece

4 attachment section

6 machine tool

8 rotation axis

10 processing section

12 longitudinal axis of the tool

14 toothing

16 toothing line

18 second gearing straight

20 toothed curve

22 recess

24 lateral recess

26a side edge of the tool

26b Side edge of the tool

28 curved edge

30 central passage opening

32 peripheral recesses

Claims

Tool (1) for machining a workpiece (2), with a

Attachment section (4) for fastening the tool (1) to a drivable tool spindle of a machine tool (6), so that the tool (1) about an axis of rotation (8) oscillating back and forth, and with a processing section (10) with a toothing (14), wherein a longitudinal axis (12) of the tool (1) is aligned substantially orthogonal to the axis of rotation (8), wherein the toothing (14) asymmetrically with respect to the longitudinal axis (12) of the tool (1) is formed , and where the

Machining section (10) asymmetrically with respect to the longitudinal axis (12) of the tool (1) is formed.

Tool (1) according to Claim 1, in which the toothing (14) is divided into two unequal or unequal parts by the sectional plane spanned by the rotation axis (8) and the longitudinal axis (12).

A tool (1) according to claim 2, wherein the entire toothing (14) forms one of the two unequal parts.

Tool (1) according to one of claims 1 to 3, wherein the

Processing section (10) has a lateral recess (24).

A tool (1) according to claim 4, wherein the lateral recess (24) extends from the toothing (14) to a side edge (26a, 26b) and / or a curved edge (28) from the toothing (14) up to a side edge (26a, 26b) forms.

Tool (1) according to one of claims 1 to 5, wherein the toothing (14) is arranged at least partially on at least one straight line (16), which is not orthogonal, in particular acute angle to the longitudinal axis (12).

Tool (1) according to one of claims 1 to 6, wherein the toothing (14) is at least partially disposed on two straight lines (16, 18) which are arranged obliquely to each other in the same plane.

8. Tool (1) according to one of claims 1 to 7, wherein the toothing (14) at least partially on a curved curve (20), preferably on a curved curve (20) and at least one straight line (16, 18) is arranged ,

9. Tool (1) according to any one of claims 1 to 8, wherein the

Processing section (10) at least one, preferably several

Recesses (22), which extends over the entire strength of

Tool (1) extend.

10. Tool (1) according to claim 9, wherein the width of the recess (22) in

Direction of the toothing increases or the sum of the content of the surfaces of the recesses (22) and / or the number of recesses in a region which is closer to the toothing (14) is greater than in an area which is further from the Gearing (14) is spaced.

1 1. Tool (1) according to one of claims 1 to 10, wherein the

Processing section (10) and the attachment portion (4) to two

different, preferably parallel and spaced in the direction of the axis of rotation (8) planes are arranged.

12. Tool (1) according to any one of claims 1 to 1 1, which is integrally formed.

13. Tool (1) according to one of claims 1 to 12, which is formed in several parts, preferably in two parts, wherein the attachment portion (4) and the

Processing section (10) are arranged on different parts.

14. Tool (1) according to one of claims 1 to 13, wherein the

Machining section (10) and / or the toothing (14) are formed at least partially made of hardened steel.

15. Tool (1) according to any one of claims 1 to 14, wherein the

Machining section (10) and / or the toothing (14) are at least partially diamond coated and / or hard metal strewn.

16. Tool (1) according to one of claims 1 to 15, wherein the toothing (14) of the by the rotation axis (8) and the longitudinal axis (12) wound sectional plane is divided into two unequal parts, wherein the entire toothing ( 14) forms one of the two unequal parts and partially on at least one Straight line (16) is arranged, which is not orthogonal, but at an acute angle to the longitudinal axis (12), the processing portion (10) is formed asymmetrically with respect to the longitudinal axis and a lateral recess (24) which extends from the toothing (14) extends to the side edge (26b) and a curved edge (28) from the toothing (14) to a side edge (26a,

26b), wherein the processing portion (10) has a plurality of recesses (22) which extend over the entire thickness of the tool (1) and the sum of the contents of the surfaces of the recesses (22) and / or the number of recesses in one Area which is closer to the toothing (14) is greater than in an area further from the toothing

(14) is spaced and the processing section (10) and the

Attachment section (4) on two different, parallel and in the direction of the rotation axis (8) spaced planes are arranged.