Bevelled milling head and method of manufacturing a bevelled milling head

Abstract

A chamfer milling head (1) is provided for furniture, floor, wall or other panels coated with films with a film overhang beyond the panel edges, comprising two upper and lower chamfer milling tools (2; 3) that are mutually adjustable on a rotary axis (4), which completely prevents the formation of material threads from milled film overhang and allows for safe, continuous operation of the chamfer milling head (1), which is achieved by each chamfer milling tool (2; 3) having a base body (5) with cutting blades (6; 8) that are radially spaced apart from each other and distributed around its circumference, which have an axial extension and a radial distance from each other in the direction of the opposite chamfer milling tool (3; 2) that creates a clearance (7) which is large enough that the cutting blades (8; 6) of the respective other chamfer milling tool (2;3) rotated by an intermediate angle on the axis of rotation (4) and adjustable to a depth of engagement there.;

Description

[0001] The invention relates to a chamfer milling head according to the preamble of claim 1 and a method for producing such a chamfer milling head according to claim 8. Such a chamfer milling head is known from document EP 1834 744 B1.

[0002] An edge milling group for processing panels made of wood or similar is known, DE 10 2015 204 325 A1, which has two separate edge milling tools mounted on a vertical carriage in order to be able to process the edges of panels of different thicknesses.

[0003] The disadvantage of this known edge milling group is that when milling off the film overhang, long material threads can be created that can wrap around the axis of rotation of the chamfer milling tools, which can lead to a standstill of the entire edge milling group.

[0004] Furthermore, an edge milling and stripping device for machining wooden parts and the like is known, EP 1 834 744 B1, which has two parallel and mutually adjustable disc milling cutters for the simultaneous machining of two workpiece edges, wherein the disc milling cutters are, however, not designed or suitable for cutting up material threads created during a work process.

[0005] Furthermore, a trimming device for the finishing of wooden panels or the like is known, EP 2 979 833 A1, which has a copying device between the two known disc milling cutters of EP 1 834 744 B1, which only ensures that the disc milling cutters correctly follow the contour of the profile of the panel to be machined and, just as little as the disc milling cutters, chops up material threads.

[0006] Also known is a combined milling and drawing tool, EP 3 090 823 A1, which has two intermeshing and mutually movable tools and which can mill off only one side of an edge of an edge band projecting from one side of the panel in succession and can remove the milled edge in a further operation, but cannot influence the resulting material threads when milling off the film excess.

[0007] A milling device is also known, EP 2 011 614 A1, which also has two intermeshing and differently adjustable milling tools, which can machine one after the other and only one side of a panel edge at a time and can have different cutting profiles for this purpose, but also without solving the problem of the material threads created during the milling process.

[0008] This is also the case with the known tool head and the tool system with a tool head, US 2019 / 388980 A1, whose tool head has two alternately switchable milling tools for a single edge of a workpiece, but no device for cutting milled material threads.

[0009] The object of the invention is to provide a chamfer milling head which completely prevents the formation of such material threads from milled-off film excess and thus allows safe, uninterrupted continuous operation of the chamfer milling head.

[0010] The solution to this problem is obtained in conjunction with the features of the preamble of the first patent claim according to the invention in connection with the technical features of its characterizing part in that each chamfer milling tool has a base body with cutting blades which are spaced apart radially and distributed over its circumference and which have an axial extension and a radial distance from one another in the direction of the opposite chamfer milling tool which creates a free space which is so large that the cutting blades of the respective other chamfer milling tool can engage there in an adjustable depth when rotated by an intermediate angle on the rotational axis.The cutting blades form cylindrical enveloping surfaces, particularly in the interlaced area, but also in the non-interlaced areas, so that the ends of material threads cannot work their way through to the axis of rotation of the chamfer milling head, but are chopped up beforehand by the cutting blades and then radially thrown out of the chamfer milling head and transported away from the chamfer milling head via a suction hood.

[0011] This ensures that the chamfer milling head is not hindered in its use by excessively long material strands, nor does it require a milling process to be interrupted due to clogging caused by accumulated material. Because the cutting blades of the opposing chamfer milling tools remain interlocked at every spacing position, this operational reliability can be guaranteed for all different panel thicknesses. The mutual adjustability of the distance between the involved chamfer milling tools also leads to the particularly advantageous feature that the cutting speed of the cutting blades on the workpiece is the same regardless of the material thickness, allowing the chamfer milling head to always operate at an optimal speed. This further drastically increases process reliability in panel production and ensures that the required quality is achieved.

[0012] According to the invention, the base body is designed to be axially divided, so that the base body parts can be brought together by means of screw connections on the axis of rotation of the chamfer milling head and can be fixed thereon in a movable or fixed manner, which considerably simplifies the assembly of the milling head.

[0013] Advantageous embodiments of the subject matter of the invention result from and in combination with the following subclaims.

[0014] According to a particularly preferred embodiment of the invention, the cutting blades each have an outer cutting edge and an inner cutting edge over their axial extension in the direction of rotation, which run parallel to the axis of rotation of the chamfer milling head and which are connected to one another via a straight or curved main working edge, which represents the actual main tool of the cutting blades of the chamfer milling tool and thus of the entire chamfer milling head.

[0015] Advantageously, the two chamfer milling tools are designed to be movable relative to each other to such an extent that the inner diameters of the main working cutting edges overlap each other, whereby very thin plates can be machined at the edges, whereby a V-shaped or D-shaped chamfer can be produced.

[0016] According to a preferred embodiment of the invention, this main working cutting edge has a length that is only slightly longer than a chamfer to be produced by it, so that the length can generally be kept short and hardly any speed tolerances arise over the changing radius of the chamfer milling tools.

[0017] According to a particularly preferred embodiment of the subject matter of the invention, the cutting blades of the chamfer milling tool are provided with cutting plates in the direction of rotation of the chamfer milling head, which are fixed thereto in a material-to-material manner, in particular by soldering, said cutting plates being equipped with the inner, outer and main working cutting edges, so that the cutting plates can be made of a material optimized for their use, be it hard metal or diamond cutting blades.

[0018] Preferably, the cutting edges parallel to the rotational axis are designed as chopping tools for shredding the film strips of a separated film overhang, thereby ensuring that such strips cannot wrap around the rotational axis of the milling device and hinder the operation of the milling head.

[0019] To ensure concentricity of the chamfer milling head, the chamfer milling tools are equipped with a self-centering holder, which ensures precise mounting of the chamfer milling head in a milling device.

[0020] According to the invention, there is also provided a method for producing a chamfer milling head, in which the base body of the chamfer milling tool is produced in one piece and the cutting plates are soldered onto the cutting blades, whereupon connecting bores for connecting means of the chamfer milling tool are introduced into it and the chamfer milling tool is subsequently balanced and then the base body is divided in the axial longitudinal direction so that it can be easily mounted and dismounted on a rotary axis as intended.

[0021] An embodiment of the invention is described in more detail below with reference to the drawings. They show: Fig. 1a chamfer milling head in a maximum spread position of the chamfer milling tools, Fig. 2a top view of the chamfer milling head according to Fig. 1 , and Fig. 3 a chamfer milling head with the chamfer milling tools moved together to their maximum.

[0022] The chamfer milling head 1 for milling film overhangs over the edges of film-coated furniture, floor, wall or other panels consists of two upper and lower chamfer milling tools 2; 3, which are mutually adjustable in distance on a rotation axis 4, wherein Fig. 1 a chamfer milling head 1 with the chamfer milling tools 2; 3 moved apart to their maximum extent is shown and in Fig. 3 the chamfer milling head 1 of the Fig. 1 in a maximum retracted position of the chamfer milling tools 2; 3.

[0023] Each edge milling tool 2; 3 has a base body 5 with cutting blades 6; 8 which are spaced apart from one another radially and distributed over its circumference and which have an axial recess in the direction of the opposite chamfer milling tool 3; 2 and a radial distance from one another which creates a free space 7 which is large enough for the cutting blades 8; 6 of the other chamfer milling tool 2; 3 to engage there rotated by an intermediate angle on the rotation axis 4, wherein the engagement depth is adjustable and thus the chamfer milling head with its main working cutting edges 12; 22 can be optimally adjusted to the thickness of a plate 17 coated with films 16 exactly to the position of the films 16.

[0024] The cutting blades 6; 8 have, over their axial extension in the direction of rotation 9 of the chamfer milling head 1, an outer cutting edge 10; 20 and an inner cutting edge 11; 21 which run parallel to the axis of rotation 4, as well as a main working cutting edge 12; 22 which connects these cutting edges 10; 11; 20; 21 and forms the main cutting edge of a chamfer milling tool 2; 3 and which has a corresponding shape, be it a 45° bevel to the flat surfaces of the panels 17 to be machined or else a curved contour.

[0025] To achieve maximum durability of the chamfer milling head 1, the cutting blades 6; 8 are equipped with cutting plates 14; 24, which have the cutting edges 10; 11; 12; 20; 21; 22, wherein the cutting plates 14; 24 are firmly fixed in the direction of rotation 9 of the chamfer milling tools 2; 3 on the cutting blades 6; 8, in particular are soldered thereto. For the sake of clarity, however, this is only shown in Fig. 1 and 2on one of the cutting blades 6; 8 of each chamfer milling tool 2; 3. With alternating directions of rotation, both sides of the cutting blades 6; 8 can also be equipped with such cutting plates 14; 24.

[0026] The main working edges 12; 22 each have a length that is only slightly longer than the bevel of a film 16 to be produced by them, provided that only the protruding films 16 are to be removed from the plates 17 with the bevel milling head 1. Otherwise, these main working edges 12; 24 can also be designed differently, for example, if bevels are to extend into the body edges of the plates 17.

[0027] The cutting edges 10; 11; 20; 21 parallel to the rotational axis 4 produce an inner and an outer cylindrical envelope around the chamfer milling tools 2; 3 and serve as chopping tools for shredding film strips of milled film excesses of a film 16 serving as a coating on a plate 17.

[0028] According to the invention, the base body 5 of a chamfer milling tool 2; 3 is axially divided, and the base body parts are joined together by means of screw connections on the rotational axis 4 of the chamfer milling head 1 and slidably secured thereon, which enables simplified assembly of the chamfer milling tools 2; 3. Furthermore, the chamfer milling tools 2; 3 have a self-centering receptacle 13, which ensures precise assembly of the chamfer milling head 1 in a milling device.

Claims

1. Bevel milling head (1) for furniture, floor, wall or other panels coated with films having a film overhang over panel edges, comprising two upper and lower bevel milling tools (2; 3) which are mutually distance-adjustable on an axis of rotation (4), characterized in that each bevel milling tool (2; 3) has a main body (5) that has cutting blades (6; 8) which are spaced apart from one another radially and distributed over the circumference thereof and which have an axial extension and a radial distance from one another in the direction of the opposite bevel milling tool (3; 2) which creates a free space (7) that is large enough that the cutting blades (8; 6) of the other bevel milling tool (2; 3) can engage there in an adjustable depth when rotated by an intermediate angle on the axis of rotation (4), and that the main body (5) is designed to be axially divided and the base body parts are joined together by means of screw connections on the axis of rotation (4) of the bevel milling head (1) and are fixed thereon in a displaceable or fixed distance-adjustable manner.

2. Bevel milling head (1) according to claim 1, characterized in that the cutting blades (6; 8) have, along their axial extension in the direction of rotation (9), an outer cutting edge (10; 20) and an inner cutting edge (11; 21) which run in parallel with the axis of rotation (4), as well as an angled, straight or curved main working cutting edge (12; 22) connecting these cutting edges (10; 11; 20; 21).

3. Bevel milling head (1) according to claim 2, characterized in that the two bevel milling tools (2; 3) are designed to be movable relative to one another to such an extent that the inner diameters of the main working cutting edges (12; 22) overlap one another and very thin plates having foils can be machined.

4. Bevel milling head (1) according to claim 2, characterized in that the cutting blades (6; 8) are equipped with cutting plates (14; 24) having the cutting edges (10; 11; 12; 20; 21; 22) and the cutting plates (14; 24) are integrally fixed to the cutting blades (6; 8) of the bevel milling tool (2; 3) in the direction of rotation (9) of the bevel milling head (1).

5. Bevel milling head (1) according to either claim 2, 3 or 4, characterized in that the main working cutting edge (12; 22) has a length which is slightly longer than a bevel created thereby.

6. Bevel milling head (1) according to any of the preceding claims 2 to 5, characterized in that the cutting edges (10; 11; 20; 21) parallel to the axis of rotation (4) are designed as chopping tools for milling film strips of a separated film overhang.

7. Bevel milling head (1) according to any of the preceding claims, characterized in that the bevel milling tools (2; 3) have a self-centering holder (13).

8. Method for producing a chamfer milling head (1) according to one of the preceding claims, characterized in that a main body (5) of the bevel milling tool (2; 3) is produced in one piece and the cutting plates (14; 24) are soldered onto the cutting blades (6; 8), whereupon connecting bores for connecting means of the bevel milling tool (2; 3) are introduced therein and the bevel milling tool (2; 3) is subsequently balanced and then the main body (5) is divided in the axial longitudinal direction.

Images