Rotating milling head with a clamping device for milling or planing knives

Abstract

Rotatable milling head with a clamping device for milling or planing knives, characterized in that the milling or planing knives, viewed from the axis of rotation of the milling head, can be subjected to external pressure.

Description

SUBJECT OF THE INVENTION

[0001] The invention relates to a novel fastening of milling or planing knives in a milling head for woodworking machines. BACKGROUND OF THE INVENTION

[0002] Several types of milling heads still exhibit unresolved defects.

[0003] The holders for milling or planing knives are usually designed in such a way that they must have recesses to fit into the tool holders. However, this compromises their stability and consequently operational safety.

[0004] Especially due to the high rotational speeds involved in milling, a secure fastening of the milling or planing knives is of utmost importance, particularly to avoid serious accidents.

[0005] Additionally, milling or planing blades must ensure good material removal – firstly to increase working speed, and secondly to prevent the operator from applying excessive pressure to the workpiece. Furthermore, the milling or planing blades must reliably withstand the pressure against the workpiece.

[0006] Furthermore, the clamping area, i.e. the recess in the tool in which the milling or planing knives or cutting inserts are placed, easily becomes clogged with chips and resin in conventional milling tools, leading to time-consuming and sometimes tedious cleaning processes. STATE OF THE ART

[0007] Numerous attempts have been made to secure cutting inserts, knife inserts, and milling or planing knives in milling heads. However, these methods still require improvement. EP2815837B1 describes a milling head and its use. The milling head has several receiving openings into which blades can be inserted. Filling the head with a fluid creates high pressure, which hydraulically clamps the blades in place. EP3623127A1 shows a milling head with a mechanical clamping device for cutting inserts, which, however, must be slotted for centering. The clamping device is based on a screw with two opposing threads, which has proven difficult to handle. EP3305489A1 describes a woodworking machine with a milling head that has mounting options for cutting inserts. Each mounting includes a radially open groove in which a cutting insert is clamped between a first groove wall and the groove itself. For improved accessibility, the clamping screws are always arranged perpendicular to the axis. The screw receptacle is designed as a ball socket, and the end of the screw has a round head. A spring element positions an inserted cutting insert and presses it radially outward against a designated stop. DE10350851B4 describes a milling tool that has several radially outwardly open receptacles into which milling or planing knives can be clamped against a stop surface. The blades are finely adjustable by elastic deformation of the support body. EP1917118B1 describes a milling head in which blades are inserted into recesses of a base body and each can be fixed axially adjustable by means of a wedge body. EP3204202B1 describes a milling head for machining materials and milling or planing knives for this purpose. A support body has an outwardly radially open recess for receiving a milling or planing knife, which can be clamped in place by means of a clamping jaw actuated by a screw. The recess also has an elastic stop surface for the milling or planing knife. WO1996033056A1 describes a cutter head, in particular a planer cutter head.

[0008] Here, a support body has a receptacle for a milling or planing knife, which is held by a movable pressure jaw. When moved, this clamps the milling or planing knife against a stop. TASK OF INVENTION

[0009] The object of the present invention is to eliminate the existing shortcomings of milling tools and to make advantageous use of the high peripheral speeds in milling. SOLUTION

[0010] To solve this problem, the invention proposes to increase the clamping force in the milling head by means of trapezoidal pressure jaws that press the milling or planing knives against the body of the milling head and increase the pressing pressure of the tool blade against the workpiece.

[0011] For this purpose, the tension is applied below the milling or planing blades. This ensures that it acts in the same direction as the centrifugal force generated by the rotation.

[0012] For this purpose, clamping screws are positioned so that they apply pressure to the milling or planing knives at their blunt end via a deflection element.

[0013] Both forces thus reinforce each other, increasing the cutting pressure of the milling or planing knives on the material of the workpieces and fixing the milling or planing knives more effectively.

[0014] The clamping screws are arranged in a space-saving manner to make the largest possible chip space available in the milling head.

[0015] The screws are always arranged at a 90-degree angle to the tool axis. This design allows for a smaller milling depth in the milling head, which has a positive effect on stability. It also makes the milling or planing blades more durable.

[0016] The thread centers of the clamping screws are also aligned with the center of rotation of the head, which simplifies the manufacturing of the milling head.

[0017] The pressure jaws contain two pins that allow them to be lowered when the clamping screws are loosened. This makes it quick and easy to replace all the components of the milling head, especially the milling and planing knives.

[0018] A small angle of the pressure jaws increases the clamping force, but this can cause them to jam. To prevent this, the pressure pins increase the contact angle, while the milling angle of the clamping jaws remains small. DESCRIPTION OF THE INVENTION BASED ON THE DRAWING Fig. Figure 1 shows the milling or planing knife (2), the pressure element (3a), the deflector / chip breaker (3b), the magnets (3c) for connecting the pressure element (3a) and the deflector / chip breaker (3b), the groove for securing the knife (3d), the pressure pin at 45° (4), a clamping screw (5), a fixed thrust deflection element (6a) and a movable thrust deflection element (6b) inserted into the milling head (1). Fig. Figure 2 shows the milling head (1) with two recesses for milling or planing knives. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] EP 2815837B1

[0007] EP 3623127A1

[0007] EP 3305489A1

[0007] DE 10350851B4

[0007] EP 1917118B1

[0007] EP 3204202B1

[0007] WO 1996033056A1

[0007]

Claims

[1] Rotating milling head with a clamping device for milling or planing knives, characterized by that the milling or planing knives, viewed from the axis of rotation of the milling head, can be subjected to outward pressure. [2] Milling head according to claim 1, characterized by , that the fastening pressure is achieved by redirecting the pressure of clamping screws to the blunt end of the milling or planing knives by means of thrust redirection elements. [3] Milling head according to claim 2, characterized by that the thrust diversion elements consist of a cranked, wide hook which slides rotatingly in a congruent half-shell and exerts pressure on the underside of the conical clamping jaw and thus a clamping effect on the blunt end of the knife. [4] Milling head according to at least one of claims 1 to 3, characterized by, that the pressure elements for fixing the knife exert a force in the same direction as the centrifugal force and the combination of applied pressure force and centrifugal force presses the knife together against the workpiece. [5] Milling head according to at least one of claims 1 to 4, characterized by that the clamping jaws are recessed in the milling head. [6] Milling head according to at least one of claims 1 to 5, characterized by that the clamping screws are spaced apart behind the profile knife and run at an acute angle to it. [7] Milling head according to claim 6, characterized by that the clamping screws are aligned at an angle of 90 degrees to the tangent to the circular circumference of the cutter shaft. [8] Milling head according to at least one of claims 1 to 7, characterized by , that pins are inserted into the clamping jaws, which allow them to be lowered and removed when the clamping screws are loosened.

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