DE102019111843B4 - cutting tool - Google Patents

Abstract

Cutting tool (Z) with a basic tool holder (1), an insertion rod (2) of an interchangeable head (3) being insertable into an insertion opening (10) of the basic tool holder (1), the insertion rod (2) being inserted in the basic tool holder (1) through a Screw element (4) can be fixed, which can be operatively connected to a screw opening (5), characterized in that the interchangeable head (3) consists of the insertion rod (2) and a tool holder (6), the insertion rod (2) having a recess (7 ) with an inclined stop (8), wherein in the fixing position the screw element (4) can be screwed with a cylindrical tip through the screw opening (5) to the inclined stop (8) in a fixing manner, the insertion opening (10) being a corner profile or an oval profile, wherein the insertion rod (2) is designed to be form-fitting to the insertion opening (10).

Description

technical field

The invention relates to a cutting tool according to the preamble of claim 1 and the independent claim 2 and claim 3.

State of the art

Such cutting tools are already known and used in many forms and configurations. For example, in the DE 20 2010 009 471 U1 discloses a cutting tool which is held and adjusted by two holder parts which are wedge-shaped and can be displaced in relation to one another.

A large number of quick-change clamping systems for cutting tools are now available. However, the systems available on the market have the disadvantage that they can often only be used for certain machine types and cannot be used independently of the machine. Or the systems are indeed suitable for different machine types, but cannot always be used on all machine types due to a tightening screw with lateral 90° attachment. This in turn leads to increased costs and represents a market entry barrier, since the costs for the end customer and the limited applicability do not provide a convincing overall picture and therefore no clear benefit for the end customer. The quick-change systems for cutting tools described in the prior art also require the use of specialist personnel, at least in part. This in turn can lead to increased machine downtimes.

• Die DE 20 2005 012 862 U1 offenbart ein Zerspanungswerkzeug mit ein um seine Längsachse drehbar antreibbaren Werkzeughalter, an dessen Stirnseite ein Schneideinsatz mittels einer Spannschraube befestigt ist, die eine zentrale Bohrung des Schneideinsatzes durchgreift und die in einer gegen eine längsaxiale Verschiebung gesicherten Hülse mit einem Innengewinde eingeschraubt ist.

The following publications should be mentioned for the technical background:

• the DE 20 2005 012 862 U1 discloses a cutting tool with a tool holder that can be driven to rotate about its longitudinal axis, on the end of which a cutting insert is fastened by means of a clamping screw, which passes through a central bore of the cutting insert and which is screwed into a sleeve with an internal thread that is secured against longitudinal axial displacement.

the DE 20 44 092 A discloses a cutting tool whose cutting insert is supported against a recess arranged in the holder and has an opening which accommodates a clamping pin.

the EP 1 990 113 A1 discloses a tool assembly in which a working part is fixedly coupled to a clutch part and torque can be transmitted to a working part without loss.

the DE 42 12 709 C2 discloses a tool with an interchangeable cutting body having a cylindrical shank for machining, wherein a fastening element is designed as a clamping screw with a taper which is directed tangentially to the inclined surface of the cutting body, so that by a tightening movement of the clamping screw the cutting body is secured by means a resultant frictional force generated there in the thrust direction, is aligned and clamped on a stop pin arranged in the base holder.

the U.S. 2012 0237305 A1 discloses a multifunctional cutting tool, wherein a chip discharging portion comprises a helical portion formed helically with respect to the central axis of the cutting tool so that the chip discharging portion is not positioned on the portion where a tool holder clamps the cutting tool and concentrates a cutting load during the cutting process becomes.

the CH 668 373 A5 discloses a tool holder for an axial adjustment device of a rotating tool with a connecting shank which is provided with a fitting bore coaxial with the axis of a connecting shank.

the DD 154 431 A3 discloses a clamp holder, rotatable and lockable in one attachment of the holder shaft and secured in an axial position, a holding body is arranged circumferentially with several semi-cylindrical receiving recesses corresponding to different diameters of the lathe tool, the receiving recesses of which can be brought one after the other to the engagement point of the clamping means.

object of the invention

The object of the present invention is to overcome the disadvantages of the prior art. In particular, a cutting tool is to be provided which can be released and fixed quickly and easily. In particular, a universal, machine type-independent clamping system in combination with a quick-change holder should be made available in order to be able to change tool sets without great effort and without specialist personnel.

solution of the task

The features according to claim 1, claim 2 and claim 3 lead to the solution of the problem.

Advantageous configurations are described in the dependent claims.

A cutting tool according to the invention consists primarily of a basic tool holder and a replaceable head. The basic tool holder includes an insertion opening and a screw opening. The interchangeable head in turn includes an insertion rod and a tool holder.

The insertion rod of the interchangeable head can be inserted into the insertion opening of the basic tool holder. The shape and dimensions of the insertion opening are essentially matched to the shape and dimensions of the insertion rod. This means that the insertion rod can be inserted into the insertion opening in a defined shape and length. The replaceable head can also be fixed or secured to the basic tool holder by means of a screw element. For this purpose, a screw element is connected to the screw opening. In detail, this means that the screw element has an external thread, through which the screw element can be screwed into an internal thread of the screw opening.

In the exemplary embodiment according to the invention, the insertion rod has a recess. In side view, this is a U-shaped recess or a V-shaped recess. This recess in turn forms an inclined stop.

In the context of this invention, the fixation position is present when the interchangeable head is inserted into the basic tool holder and is fixed in the basic tool holder by the screw element.

In the fixing position, the screw element is screwed into the screw opening until a cylinder tip of the screw element is screwed onto the oblique stop and the replaceable head is pressed in a clamping manner against the inner walls of the insertion opening of the basic tool holder.

The oblique stop is designed to be inclined away from the tool holder. A slope of the inclined stop is designed to extend away from the interchangeable head. Specifically, this means that the bevel is arranged closest to the interchangeable head in the area of a bottom of the recess and the distance to the interchangeable head continues to increase via the bevel away from the bottom.

In a secondary exemplary embodiment, the insertion rod has a flat stop instead of the oblique stop. This in turn means that the plan stop runs essentially at right angles away from the bottom of the recess and thus the same distance from the replaceable head or the tool holder is provided over the entire extent of the plan stop. In this secondary exemplary embodiment, the screw element has a cone tip. In the fixing position, the screw element is screwed with the cone tip into the screw opening until the cone tip hits the flat stop and fixes the insertion rod of the replaceable head in the insertion opening of the basic tool holder.

In a further secondary exemplary embodiment, the insertion rod also has the oblique stop already mentioned above. In this secondary exemplary embodiment, the screw element has the cone tip. In the fixing position, the screw element is screwed with the cone tip into the screw opening until the cone tip hits the oblique stop and fixes the insertion rod of the replaceable head in the insertion opening of the basic tool holder.

The recess in the insertion rod forms a setting edge, the bottom and the plan stop or the oblique stop, with the plan stop or the oblique stop extending away from the floor at a right angle or at an angle of more than 90°.

The tool holder includes a cutting tool. This can, in particular, be a chipper. The cutting tool or the chipper is a tool for machining workpieces. These can be metal workpieces, but non-metal materials such as plastics, wood, ceramics or the like can also be included.

The screw opening is arranged at an angle to the insertion opening. The angle is preferably less than 90°, but can also be exactly 90° or even greater than 90°. If the angle were 90°, the screw opening would run perpendicular to the insertion opening. If the angle were greater than 90°, the screw opening would be inclined away from an entry opening of the insertion opening. In practice, an angle of less than 90° has proven to be the most effective turned out. However, the other possibilities should be covered by the present invention.

In a preferred exemplary embodiment, the screw opening is formed at a right angle to the oblique stop in the fixing position. This advantageously means that the insertion rod can be fixed quickly and easily in the recess.

The insertion opening can have different hollow profiles. Specifically, it can be a circular profile, a corner profile or an oval profile, with the insertion rod being designed to be form-fitting to the insertion opening. Positive here means that the insertion rod can be pushed into the insertion opening without tilting.

The chipper can be placed in a tool recess, the chipper being received in the tool recess in such a way that there is sufficient support during the machining process. The chipper protrudes in a defined form from the tool recess in order to be able to process the workpiece with the appropriately specified cutting edges. The chipper is reversibly connected to the replaceable head by means of a fixation. The fixation is regularly a tool screw.

The basic tool holder has a stop bevel in the area of the screw opening. In the fixation position, the screw opening has a stop bevel on the side facing away from the insertion rod. In detail, this means that in the fixing position the oblique stop is designed parallel to the stop bevel. Running parallel means that in the fixing position from the side view of the cutting tool, ie on the longitudinal extension of the cutting tool, the inclined stop and the inclined stop form two parallel surfaces.

character list

• 1 eine teilweise Schnittansicht durch eines Zerspanungswerkzeug gemäss der vorliegenden Erfindung;
• 2 eine Seitenansicht eines Wechselkopfes für ein Zerspanungswerkzeug nach 1; und
• 3 ein Längsschnitt durch einen Werkzeuggrundhalter des Zerspanungswerkzeuges nach 1.

Further advantages, features and details of the invention result from the following description of preferred exemplary embodiments and from the drawings; these show in:

• 1 a partial sectional view through a cutting tool according to the present invention;
• 2 a side view of a replaceable head for a cutting tool 1 ; and
• 3 a longitudinal section through a basic tool holder of the cutting tool 1 .

example

In 1 a cutting tool Z is shown. The cutting tool Z comprises a basic tool holder 1 and a replaceable head 3 , which in turn comprises an insertion rod 2 and a tool holder 6 .

The basic tool holder 1 of the cutting tool Z has an insertion opening 10 and a screw opening 5, which preferably have an angle α to one another. In the present case, the angle α is preferably less than 90°.

An insertion rod 2 of the interchangeable head 3 can be introduced into the insertion opening 10 , the insertion opening 10 being able to form a circular profile, a corner profile or an oval profile for this purpose, with the insertion rod 2 being designed with a positive fit to the insertion opening 10 .

The insertion rod 2 can be fixed in the basic tool holder 1 or in the screw opening 5 by means of a screw element 4 .

For this purpose, the insertion rod 2 has a recess 7 with an oblique stop 8, with the screw element 4 being screwed with a cylindrical tip through the screw opening 5 onto the oblique stop 8 in the fixing position in a fixing manner. In this way, the replaceable head 3 is held firmly in the basic tool holder 1 .

The screw opening 5 is formed at a right angle β to the oblique stop 8 in the fixing position.

However, it is also conceivable here for the screw element 4 to have a cone tip, so that the recess 7 then has a planar stop 17, which in 2 is shown in dashed lines, so that it is ensured that the interchangeable head 3 is held securely and firmly in the insertion opening 10 . In the fixing position, it must be possible to screw the screw element 4 with the tip of the cone through the screw opening 5 to the plan stop 17 in a fixing manner in order to hold the replaceable head 3 firmly in the basic tool holder 1 .

Of course, it is conceivable to design the sloping surface 8 so that it can also be brought into an operative connection for the cone tip of the screw element 4 . There are no limits to the invention here.

In addition to the recess 7, the insertion rod 2 has a setting edge 15 and a base 16 on. In the case of the oblique stop 8, this is designed to be inclined away from the tool holder 6. In the case of the flat stop 17, in contrast to the oblique stop 8, this runs away from the floor 16 at a right angle γ.

The tool holder 6 has a cutting tool 9, in particular a chipper. the chipper 9 can be placed in a form-fitting manner in a tool recess 12 and is reversibly connected to the interchangeable head 3 by means of a fixation 13 .

In the fixing position, the screw opening 5 has a stop bevel 14 on the side facing away from the insertion rod 2 . This stop surface 14 is formed parallel to the oblique stop 8 in the fixing position.

• Der Werkzeuggrundhalter 1 wird mit einem Klemmschaft 18 in einer nicht näher gezeigten Spannvorrichtung einer Maschine befestigt und gegebenenfalls mit ebenfalls nicht näher gezeigten maschinenseitigen Kühlmittelleitungen verbunden. Der Wechselkopf 3 ist über den Einbringstab 2 in der Einschuböffnung 10 mit dem Werkzeuggrundhalter 1 verbunden.

Referring to the 1 until 3 the functioning of the cutting tool Z according to the invention is explained as follows:

• The basic tool holder 1 is fastened with a clamping shank 18 in a clamping device of a machine, not shown in detail, and optionally connected to coolant lines on the machine, also not shown in detail. The interchangeable head 3 is connected to the basic tool holder 1 via the insertion rod 2 in the insertion opening 10 .

If another cutting tool 9 is now to be used, the interchangeable head 3 must be exchanged. In detail, this means that first an external thread of the screw element 4 that is not visible in detail is unscrewed from an internal thread 19 of the screw opening 5 . The cylinder tip or the cone tip of the screw element 4 is thus removed from the oblique stop 8 or, correspondingly, the cone tip of the screw element 4 is removed from the flat stop 17 and the fixation of the interchangeable head 3 in the insertion opening 10 is released.

If the screw element 4 is screwed out of the screw opening 5 far enough, the interchangeable head 3 or its insertion rod 2 can be pulled out of the insertion opening 10 .

A new interchangeable head 3 with a different cutting tool 9 can now be reinserted into the basic tool holder 1 . For this purpose, the interchangeable head 3 is inserted into the insertion opening 10 by means of its insertion rod 2 . As soon as the insertion rod 2 has been completely accommodated in the insertion opening 10, the screw element 4 can be screwed into the internal thread 19 of the screw opening 5 by means of its external thread.

As soon as the cylinder tip of the screw element 4 hits the inclined stop 8 or the cone tip of the screw element 4 hits the flat stop 17 or the inclined stop 8 or the screw element 4 can no longer be screwed into the screw opening of the basic tool holder 1, the replaceable head 3 is fixed fixed in the tool holder 1. The cutting tool Z can be put into operation again.

Although only a preferred embodiment of the invention has been described and illustrated, it is obvious that those skilled in the art can add numerous modifications without departing from the spirit and scope of the invention.

Reference List

1

basic tool holder

2

placement rod

3

interchangeable head

4

screw element

5

screw hole

6

tool holder

7

recess

8th

diagonal stop

9

chipper

10

insertion opening

12

tool recess

13

fixation

14

stop bevel

15

setting edge

16

floor

17

plan stop

18

clamping shaft

19

inner thread

Z

cutting tool

a

angle

β

right angle

g

right angle

Claims (10)

Cutting tool (Z) with a basic tool holder (1), an insertion rod (2) of an interchangeable head (3) being insertable into an insertion opening (10) of the basic tool holder (1), the insertion rod (2) being inserted in the basic tool holder (1) through a Screw element (4) can be fixed, wel ches can be operatively connected to a screw opening (5), characterized in that the interchangeable head (3) consists of the insertion rod (2) and a tool holder (6), the insertion rod (2) having a recess (7) with an inclined stop (8) in the fixing position, the screw element (4) can be screwed with a cylindrical tip through the screw opening (5) to the inclined stop (8) in a fixing manner, the insertion opening (10) being a corner profile or an oval profile, the insertion rod (2) closing in a form-fitting manner the insertion opening (10) is executed. Cutting tool (Z) with a basic tool holder (1), an insertion rod (2) of an interchangeable head (3) being insertable into an insertion opening (10) of the basic tool holder (1), the insertion rod (2) being inserted in the basic tool holder (1) through a Screw element (4) can be fixed, which can be operatively connected to a screw opening (5), characterized in that the interchangeable head (3) consists of the insertion rod (2) and a tool holder (6), the insertion rod (2) having a recess (7 ) with a flat stop (17), wherein in the fixing position the screw element (4) can be screwed with a cone tip through the screw opening (5) to the flat stop (17) in a fixing manner, the recess (7) having a setting edge (15), a base (16) and the flat stop (17), the flat stop (17) running away from the base (16) at a right angle (γ), the insertion opening (10) being a corner profile or an oval profile, the insertion rod ( 2) form-fitting to the insertion opening (10) is executed. Cutting tool (Z) with a basic tool holder (1), an insertion rod (2) of an interchangeable head (3) being insertable into an insertion opening (10) of the basic tool holder (1), the insertion rod (2) being inserted in the basic tool holder (1) through a Screw element (4) can be fixed, which can be operatively connected to a screw opening (5), characterized in that the interchangeable head (3) consists of the insertion rod (2) and a tool holder (6), the insertion rod (2) having a recess (7 ) with an inclined stop (8), wherein in the fixing position the screw element (4) can be screwed with a cone tip through the screw opening (5) to the inclined stop (8) in a fixing manner, the insertion opening (10) being a corner profile or an oval profile, wherein the insertion rod (2) is designed to be form-fitting to the insertion opening (10). Cutting tool (Z) according to one of the preceding claims, characterized in that the oblique stop (8) is designed to be inclined away from the tool holder (6). Cutting tool (Z) according to one of the preceding claims, characterized in that the tool holder (6) has a cutting tool, in particular a chipper (9). Cutting tool (Z) according to one of the preceding claims, characterized in that the screw opening (5) is arranged at an angle (α) to the insertion opening (10). Cutting tool (Z) according to one of the preceding claims, characterized in that the screw opening (5) is formed at a right angle (β) to the inclined stop (8) in the fixing position. Cutting tool (Z) according to one of the preceding claims, characterized in that the cutting tool (9) can be placed in a tool recess (12) in a form-fitting manner and is reversibly connected to the interchangeable head (3) by means of a fixing (13). Cutting tool (Z) according to one of the preceding claims, characterized in that the screw opening (5) in the fixing position has a stop bevel (14) on the side facing away from the insertion rod (2). Cutting tool (Z) after claim 9 , characterized in that in the fixing position the oblique stop (8) is designed parallel to the stop bevel (14).

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