EP0382877B1 - Apparatus for smoothing and thicknessing wooden work pieces of any size, particularly short and thin pieces - Google Patents

Abstract

The invention relates to a machine for surface and thickness working of wood workpieces of any dimensions, in particular short and thin workpieces without rigid clamping of the workpiece, consisting of a machine housing, a movable working table, a two-part baseplate with circular cutout into which a face of a milling head provided with fixed and exchangeable cutting edges is inserted. In the head, there is a guide insert. An upper guide strip is disposed in exactly the same plane as the cutting edge apex on the milling head and also in the same plane as a stationary portion of the baseplate. At least two working spindles, set at predetermined angles, are provided. The workpiece slides on the two-part baseplate guided by two flank guide rails and an upper guide strip forming together a movement channel for the workpiece.

Description

Area of technology

The invention lies in the field of woodworking machines and falls and falls, for example, in the IPC: B 27 C 1/06; B 27 C 5/04; B 27 J 1/00; B 27 M 3/04.

The invention is based on a machine for surface finishing of short and thin workpieces of any dimensions, in particular thin workpieces of small dimensions, without rigid clamping of the workpiece. One, two or more work spindles are provided for the tool for the cutting process and circular motion, as well as a stationary circular guide insert for surface compensation and for processing the thickness of the wooden workpieces. These are arranged one behind the other; each of these spindles has a separate drive, a sliding plate with two lateral guide rails attached to the work table. The table moves vertically; Raising and lowering the slide plate adjusts the thickness of the section on the workpiece surface; the upper guide bar, which is still provided, is adjusted in the vertical direction; the wood workpiece is set at this height before processing.

The technical problem to be solved according to the invention

• - Bearbeitung von Holzwerkstücken kleiner Abmessungen ohne steife Einspannung;
• - Gewährleistung hoher Qualität der zu bearbeitenden Oberflächen, die außer Lackierung, Beizen oder seitlichem oder oberflächigem Bekleben des Holzwerkstücks keine zusätzliche Bearbeitung verlangt;
• - Bearbeitung von langen und dünnen (schmalen) Werkstücken;
• - Bearbeitung von Werkstücken ohne Bezug auf Bewegungsrichtung und Lage des Werkstücks;
• - Beseitigung der Gefahr eines Rückschlags des Werkstücks bzw. Herausfallen eines Werkstücks aus der Bearbeitungsmaschine;
• - Geräuschverminderung unter 82 Dezibel;
• - schnelle und einfache Auswechslungen und Einstellungen des Werkstücks;
• - Parallelität der Oberfläche des bearbeitenden Holzwerstücks;
• - Beseitigung des Eindringens des Werkszeugs in das Holzwerkstück am Ende und am Beginn jeder Bearbeitungsoberfläche;
• - hochwertige Bearbeitung der Holzwerkstücke bei eingewachsenen Ästen, Knorren usw.;
• - Hochwertige Bearbeitung bei gebogenen Konstruktionen oder Holzwerkstücken mit besonderen Zug- und Kompressionseigenschaften bzw. Charakteristiken;
• - Materialabnahme bis unter 0,1 mm.

Known machines for surface and thickness processing of wooden workpieces do not enable the following processes, for example:

• - Processing of wooden workpieces of small dimensions without rigid clamping;
• - Ensuring high quality of the surfaces to be machined, which, apart from painting, staining or gluing the sides or surface of the wooden workpiece, does not require any additional machining;
• - machining of long and thin (narrow) workpieces;
• - Machining workpieces without reference to the direction and position of the workpiece;
• - Elimination of the risk of the workpiece kicking back or a workpiece falling out of the processing machine;
• - noise reduction below 82 decibels;
• - Quick and easy changes and settings of the workpiece;
• - parallelism of the surface of the machined wooden workpiece;
• - elimination of the penetration of the tool into the wooden workpiece at the end and at the beginning of each processing surface;
• - high-quality processing of wooden workpieces with ingrown branches, knots, etc .;
• - High quality processing of curved constructions or wooden workpieces with special tensile and compression properties or characteristics;
• - Material removal down to less than 0.1 mm.

State of the art

From French patent application FR-A-463.863, the woodworking machine with a stationary disc is known, which is carried by two parallel supports and which is attached to the machine housing and fastened with screws to the two parallel supports. In this known embodiment, the stationary disc is designed as a round disk with radial groove on the side, which has a recessed lower surface.

From German patent application DE-B-1 081 653, the milling machine for processing short wooden workpieces is known, preferably for processing parquet belts, the parallel side guide pieces and the inner milling table for guiding the workpiece above or below the milling head in one inseparable piece.

De-OS 21 912.8 describes a woodworking machine in which the tool holder has two tools seated on the same vertical axis, the tool holder being inserted into the outer tool holder, representing a tool-in-tool construction. The inner tool holder with circular saw is designed so that a circular movement is caused during machining, in which the outer and inner tool holder are rotated in the same direction; an adjustment possibility with regard to different peripheral speeds of one or more tool holders is possible, the inner tool holder being designed such that it is fastened on the work spindle with a threaded nut; For this purpose, a corresponding recess is provided in the inner tool holder. The outer tool holder with inserted tool in the form of cutting knives is designed in the form of a truncated cone and is used for rough preparation of a wood workpiece of greater length.

The known machine with double tool holder works so that the wooden workpiece of greater length engages in the area of the tool (inserted in pairs in the upper and lower holder); both holders are rotated against each other on the same vertical axis at an angle of 180. The outer holders with inserted tools take care of the pre-machining of the gron; the inner tool holder with tools for finishing large wooden workpieces Length.

The known machine with two processing heads, which are set on the same vertical axis and at an angle to each other of 180 _° (rotated) and with dipple tool holder, is disadvantageous in that when processing the wooden workpiece of very short length, it is placed in the edge area between the surface of the inside Holder and the surface of the tool clamped in this holder. It can also jam into the recess edge for the screw connection with shaft in the circular saw holder; There is also friction between the rotating and the only movable tool during workpiece transfer, which, if the tool piece is shorter than the tool pressure knife, results in movement of the workpiece in the tangential direction of the tool and which leads to workpiece failure and inaccurate machining long workpieces, because the tool surface cannot be used as a guide support due to the rotation.

Such a machine is therefore not useful in practice for machining workpieces of small dimensions and thin workpieces, because machining qualities that are too large and too high are necessary.

Furthermore, from DE-OS 36 03 313 a cylindrical planing spindle with longitudinal cutters used for surface processing of wooden workpieces is known, but has not become established in practice for the surface processing of wooden workpieces of small dimensions and thin workpieces, because the opening between the fixed and movable sliding plate of the work table from the machine is determined by the diameter of the planing spindle and the thickness of the material removal, the longitudinal opening being coaxial with the longitudinal axis of the planing spindle.

In practice it is not possible for such reasons with such a construction to use this planing spindle for the industrial machining of workpieces of small dimensions and thin workpieces.

Solution of the technical problem

• - Holzwerstücke sehr kleiner Längen ohne Werkstückeinspannung können bearbeitet werden;
• - eine Bearbeitungsmaschine nach der Erfindung ist geeignet, Holzwerkstücke sehr kleiner Längen flächig auf gewünschte Dicke und Breite zu bearbeiten;
• - einige Spannvorrichtungen unterschiedlichster Konstruktion fallen weg; - - die Bearbeitungsmaschine gemäß der Erfindung ist geeignet zur Holzbearbeitung mit kleinstmöglichem Holzabfall;
• - es wird möglich, die Bearbeitungsvorrichtung aus klassischen Maschinen der Holzbearbeitung verschiedenster kontruktiver Bauart und Bestimmung anzubringen: sie kann als komplette selbstständige Einheit ausgebildet sein; sie wird hier als Vorrichtung zu einem Sonderzweck für Flächen- und Dickenbearbeitung gezeigt.

The machine for machining wooden surfaces of workpieces of very short length, for example 2 cm in length, is solved by the measure according to the invention. Defects no longer occur, rather the following advantages become apparent:

• - Wooden workpieces of very short lengths without workpiece clamping can be processed;
• - A processing machine according to the invention is suitable for processing wooden workpieces of very short lengths flat to the desired thickness and width;
• - some clamping devices of various designs are omitted; - - The processing machine according to the invention is suitable for wood processing with the smallest possible wood waste;
• - It is possible to attach the processing device from classic woodworking machines of various constructional design and purpose: it can be designed as a complete independent unit; it is shown here as a device for a special purpose for surface and thickness processing.

Statement of the nature of the invention, exemplary embodiments

• - Holzwerkstücke sehr kleiner Abmessungen und dünne Werstücke ohne steife Einspannung des Werkstücks können bearbeitet werden;
• - es wird möglich, eine Qualität der Bearbeitungsflächen derart zu erreichen, daß keine zusätzliche Endbearbeitung mehr vor der Lackierung oder vor dem Ablaugen der Bearbeitungsflächen oder vor dem Abkleben von Flächen und Flanken notwendig wird;
• - die Holzbearbeitungsmaschine nach der Erfindung ist geeignet, Holzwerkstücke beliebiger Abmessungen, insbesondere sehr kleinen Durchmessers sowie dünner Holzwerkstücke auf verlangte Dicke, Breite und Länge zu bearbeiten;
• - Planflächen von Holzwerkstücken sowie Flächen unter einem bestimmten Winkel können bearbeitet werden;
• - möglich wird eine Bearbeitung unabhängig von der Richtung der Werkstückbewegung und seiner Lage;
• - eine minimale Materialabnahme, und zwar bis zu 0,1 mm, was eine zusätzliche Furnierbearbeitung ermöglicht, wird geschaffen;
• - eigene Spannvorrichtungen verschiedenster Kontruktionen entfallen;
• - die Rückschlaggefahr des Werkstücks bzw. das Herausfallen eines Werkstück aus der Maschine wird völlig ausgeschlossen;
• - Geräuschabnahme unter 80 Dezibel;
• - eine unbedingte Parallelität der Bearbeitungsoberflächen auf dem Werkstück wird erreicht;
• - vollkommen gerade Bearbeitungsoberflächen ohne Eingreifen des Werkzeugs in das Werkstück am Ende und Anfang der Bearbeitung wird gewährleistet;
• - es wird qualitativ möglich, die Holzwerkstückoberflächen mit eingewachsenen Ästen oder Knorren zu bearbeiten;
• - es wird möglich, Holzwerkstücke gebogener Konstruktion oder mit Torsions- und Kompressionseigenschaften qualitativ zu bearbeiten;
• - die Maschine nach der Erfindung ist einfach im Aufbau und in der Montage;
• - das Werkzeug läßt sich leicht auswechseln und einstellen; ebenfalls ist es leicht, die Dikkenabnahme am Werkstück schnell und sauber zu erreichen;
• - die konstruktive Ausführung der Bearbeitungsmaschine nach der Erfindung ermöglicht die Einstellung mit dem Werkzeug in vertikaler, horizontaler Richtung oder unter einem bestimmten Winkel;
• - eine qualitativ hochwertige Flächenbearbeitung der Holzwerkstücke unabhängig vom vorherigen Holzschnitt in Längs- oder Querrichtung wird möglich

Compared to the known solutions, the following results:

• - Wood workpieces of very small dimensions and thin workpieces without rigid workpiece clamping can be processed;
• - It becomes possible to achieve a quality of the processing surfaces in such a way that no additional finishing is necessary before painting or before leaching the processing surfaces or before masking surfaces and flanks;
• - The woodworking machine according to the invention is suitable for processing wooden workpieces of any dimensions, in particular very small diameters, as well as thin wooden workpieces to the required thickness, width and length;
• - Flat surfaces of wooden workpieces and surfaces at a certain angle can be processed;
• - Machining is possible regardless of the direction of the workpiece movement and its position;
• - A minimal material decrease, namely up to 0.1 mm, which enables additional veneer processing is created;
• - own clamping devices of various designs are omitted;
• - The risk of kickback of the workpiece or the falling out of a workpiece from the machine is completely excluded;
• - Noise reduction below 80 decibels;
• - An absolute parallelism of the machining surfaces on the workpiece is achieved;
• - completely straight machining surfaces without intervention of the tool in the workpiece at the end and beginning of the machining is guaranteed;
• - It becomes qualitatively possible to process the wooden workpiece surfaces with ingrown branches or knots;
• - It is possible to qualitatively process wooden workpieces of curved construction or with torsion and compression properties;
• - The machine according to the invention is simple in construction and assembly;
• - The tool can be easily changed and adjusted; it is also easy to achieve thickness removal on the workpiece quickly and cleanly;
• - The design of the machine tool according to the invention allows adjustment with the tool in the vertical, horizontal direction or at a certain angle;
• - A high quality surface processing of the wooden workpieces is possible regardless of the previous woodcut in the longitudinal or transverse direction

For this purpose, the invention is based on a machine for the surface and thickness processing of wooden workpieces of any dimensions, in particular short and thin workpieces, consisting of one, two or more vertical, horizontal or at a certain angle working spindles; with a two-part sliding plate; a movable work table; two flank guide rails and an upper slide guide, with separate work spindle drives.

The invention is characterized by a partially hollow end milling cutter head with fixed or interchangeable cutting edges, a guide insert, which is attached to the flank guide strip, being fixed in the face milling cutter head.

In this machine, guide rails are laterally adjustable and consist of two parts, one part of which moves together with the work table, while the other is fixed on the machine housing; also two-part flank strips are attached to the fixed part of the two-part slide plate, which is fixed to the machine housing, while the movable part of the slide plate moves in the vertical direction together with the work table; there is also an upper adjustable guide bar that is attached to the machine housing

For example, embodiments of the invention will now be explained in more detail with reference to the accompanying drawings.

• Figur 1 eine Seitensicht (teilgeschnitten) der Maschine zur Flächen- und Dickenbearbeitung für Holzwerkstücke beliebiger Abmessungen, insbesondere kurzer und dünner Werkstücke,ohne daß eine steife Einspannung des Werkstücks notwendig wäre; eine zweiteilige Gleitplatte 4, 4'ist dargestellt im Vertikalschnitt durch den beweglichen Arbeitstisch 6 und das Maschinengehäuse 8; zwei Arbeitsspindeln 1,11 mit jeweils eingesetztem Werkzeug 1 sowie einer von oben verstellbaren bzw einstellbaren Führungsleiste 7 sind vorgesehen;
• Figur 2 ist eine Draufsicht auf die Arbeitsspindel 1 der Fig. 1 mit Anordnung des Holzwerkstücks 11 zu Beginn der Flächenbearbeitung mit Draufsicht auf den Fräskopf 1 mit eingesetztem und befestigtem Kreisführungseinsatz 9,,der auf der Flankenführungsleiste 5 mittels einer Schraubverbindung 12 befestigt ist;
• Figur 3 ist ein Teilaxialschnitt durch die Arbeitsspindel mit Fräskopf 1, fixiertem Ringführungseinsatz 9 und zweiteiliger Gleit platte 4, 4' sowie einer rechten Flankenführungsleiste 5, auf welcher der Kreisführungseinsatz fixiert ist; diese Leiste ist an dem fixierten Teil der zweiteiligen Gleitplatte 4'befestigt;

Nach Figur 1 besteht die Flächen und Dickenbearbeitungsmaschine für Holzwerstücke beliebiger Abmessungen, insbesonderer kurzer und dünner Werkstücke nach der Erfindung aus einer Arbeitsspindel mit Fräskopf 1 zur glatten Bearbeitung der unteren neu in Fig. 2 dargestellten Werksstückfläche 11. Eine glatte Bearbeitung wird hierdurch möglich. Weiterhin vorgesehen ist eine Arbeitsspindel 11 gleicher Ausbildung, diese verfügt über einen Fräskopf 1 mit Abgleich der oberen Fläche und Dickenbearbeitung des Werkstücks 11 ( Fig.2); auf der Holzbearbeitungsmaschine nach der Erfindung ist es möglich, mehrere Arbeitsspindeln einzustellen, die sich in vertikaler oder hotizontaler Richtung oder unter einem bestimmten Winkel auf dem jeweiligen Arbeittisch 6 befinden und an welchem die Gleitplatte 4 befestigt ist, die sich zusammen mit dem Arbeitstisch 6 vertikal bewegt; auf diese Weise kann die Dicke des Werkstückabschnitts 11 (Fig.2) eingestellt werden; die Gleitplatte 4'ist auf dem Maschinengehäuse 8, auf welchem die obere Führungsleiste 7 befestigt ist, fest; die Führungsleiste bewegt sich vertikal; hierdurch wird die Werkstückhöhe 11 (Fig.2) eingestellt.These show in

• Figure 1 is a side view (partially cut) of the machine for surface and thickness processing for wooden workpieces of any size, especially short and thin workpieces, without a rigid clamping of the workpiece would be necessary; a two-part slide plate 4, 4 'is shown in vertical section through the movable work table 6 and the machine housing 8; two work spindles 1, 11, each with inserted tool 1 and a guide bar 7 adjustable or adjustable from above, are provided;
• Figure 2 is a plan view of the work spindle 1 of Figure 1 with the arrangement of the wooden workpiece 11 at the beginning of the surface processing with a plan view of the milling head 1 with inserted and fastened circular guide insert 9, which is fastened on the flank guide rail 5 by means of a screw connection 12;
• Figure 3 is a partial axial section through the work spindle with milling head 1, fixed ring guide insert 9 and two-part slide plate 4, 4 'and a right flank guide bar 5, on which the circular guide insert is fixed; this bar is attached to the fixed part of the two-part slide plate 4 ';

According to FIG. 1, the surface and thickness processing machine for wooden workpieces of any dimensions, in particular short and thin workpieces according to the invention, consists of a work spindle with milling head 1 for smooth machining of the lower workpiece surface 11 shown in FIG. 2. Smooth machining is hereby possible. Also provided is a work spindle 11 of the same design, which has a milling head 1 with adjustment of the upper surface and machining of the thickness of the workpiece 11 (FIG. 2); on the woodworking machine according to the invention it is possible to set a plurality of work spindles which are located in the vertical or hot horizontal direction or at a certain angle on the respective work table 6 and to which the slide plate 4 is fastened, which moves vertically together with the work table 6 ; in this way the thickness of the workpiece section 11 (Fig.2) can be adjusted; the slide plate 4 'is fixed on the machine housing 8 on which the upper guide bar 7 is fastened; the guide bar moves vertically; this sets the workpiece height 11 (FIG. 2).

According to Figure 2, the work spindle is provided with a hollow cylindrical milling head 1, in which the circular guide insert 9 is inserted; this circular guide insert is fixed via a screw connection 12 to the flank guide strip 5, which in turn is fastened on the slide plate 4 '. The workpiece slides on the sliding plate 4 and is guided through the flank guide bar 5, the flank guide bar 10 and the upper guide bar 7 (FIG. 1). Furthermore, the position of the workpiece 1 against the milling head 1 with a fixed guide insert 9 can be seen at the moment of the start of the surface processing, the points of engagement P1, P ₂ , P _{3 being} the same with regard to the position of the milling head 1 fixed by the guide insert 9 Level, which is also a condition for surface processing of short and thin wooden workpieces without rigid clamping.

According to FIG. 3, the milling head 1 with fixed or exchangeable cutting edges 1 'is fixed on the working shaft 3' with a fixed insert 3 "and the screw connection 13; the cutting edges 1 'on the milling head are set in such a way that the cutting apices 1' are completely identical Level as the upper sliding plate surfaces 4 'and the upper surface of the fixed guide insert.

The slide plate 4 is fixed on the work table 6 and moves vertically up and down together with it, depending on the thickness of the workpiece 11, as can be seen in FIG. 2.

The working shaft 3 'is attached to the housing of the working shaft 3, which is separated from the milling head 1 by a spacer ring 2. The slide plate 4 'is attached to the machine housing 8; A flank strip 5 is fixed above and on this plate.

The workpiece 11 moves on the slide plate 4, is held by the side rail 5, the side rail 10 and the upper guide rail 7, all of which together form a movement channel, the workpiece 11 not being clamped rigidly. When the workpiece 11 reaches the cutting edges 1 'on the milling head, the end face of the workpiece 11 is in engagement with the cutting edges 1' at points P ₁ , P ₂ , P _3. These lie in the same plane or have the same Axis; the emergence of moment forces is impossible, but at the same time it is possible that the workpiece 11 smoothly slides over the cutting edges 1 'on the milling head 1 and over the fixed guide piece 9, which, with less (thin) material decreases, the processing of a wooden workpiece 11 without anyone allows additional pressure; the force of the workpiece weight 11 on the slide plate 4 on the cutting edges 1 'and on the fixed guide insert 9 is sufficient (FIG. 2). The workpiece 11 moves over the cutting edges 1 'on the milling head 1 and cuts in the same plane as the upper surface of the sliding plate 4', which is made possible by the fixed, stationary guide insert 9 inserted in the milling head; this prevents the inclination and sliding of a short workpiece 11 into the inner part of the hollow milling head 1, because the hollow inner part or the depression in the milling head 1 is completely closed with the fixed guide insert; however, the tool is constructed in such a way that there is an air inlet slot of at most 1 mm width between the inside diameter of the hollow milling head 1 and the cutting edges 1 'and the outside diameter of the fixed guide insert 9. After machining - compensation of the lower workpiece surface 11 on the work spindle I - this moves on the slide plate 4 'under the work spindle 11 to compensate for the upper surface and thickness machining of the workpiece 11, which can be seen from FIG. 2, where the engagement points P ,, P2, P _{3 are located} between the milling head 1 with the cutting edges 1 'and the fixed guide insert 9 and the end plane of the workpiece 11 in the same plane or from the same axis, in such a way that the machining operation of the workpiece 11 is identical to the machining operation for the Working spindle I is because the design of the milling head 1 with the cutting edges 1 'and the fixed guide insert 9 for the working spindle 11 is the same as for the working spindle, which can be seen from FIGS. 1 to 3, although the design is based on a high-gloss version.

Due to the constructive design of the machine for surface and thickness processing of wooden workpieces of different dimensions, especially for short and thin workpieces according to the invention, one or more work spindles are employed in the vertical and horizontal direction or at an angle to the slide plate 4 and 4 '; In addition, a hollow milling head 1 is provided with fixed or exchangeable cutting edges 1 'and a fixed guide insert 9, which is attached in this head and is fixed on the flank guide bar 5 (FIG. 2), but also on the fixed axis 3 above, which by the hollow working shaft 3 'is guided, the upper surface of the fixed guide insert 9, the cutting vertex 1' on the milling head 1 and the upper surface of the sliding plate 4 'are always in the same plane, as the accompanying figures show. A high-quality surface treatment of the wooden workpieces 11 without rigid clamping is achieved, regardless of dimensions, wood quality and direction of the previous woodcut; furthermore, the processing means that less wood waste is available, which means considerable savings for the wood processing industry; the work process is considerably improved with regard to safety and occupational safety for the machine workers and for the environment.

Example of industrial feasibility of the invention Working spindles 1 and 11

The housing of the working shaft 3 is made of a steel and seamless tube made of the material St 35.29 .; this tube is turned to its own inner diameter, in which a standard ball bearing marked 6208 TB P 63 is attached. The working shaft 3 'is made of a drawn steel bar, made of 42 Cr Mo 4 material; the shaft is turned to the outside diameter, at the end a 13.75 mm hole is drilled out and the M 16 internal thread is cut by hand. The mounting insert 3 "is made of a drawn bar steel, made of material St 3; the material is sawn to the appropriate height, then turned and a hole 0 17 mm is also drilled therein. On the circumference of the mounting insert 3", two recesses are made with a milling cutter cut at an angle of 180 to tighten with a key.

The face cylinder milling head 1 is made from a round steel 0 180 mm, from the material 42 Cr Mo 4; the head is turned inwards and outwards, cutting edges 1` made of the material OCR 12 and G 2 are fixed in its forehead rim by brazing; but the cutters made of the same material can also be used with M4 Allen screws. The end cylinder head 1 can also be welded from sheet metal 42 Cr Mo 4 (electric welding).

The guide insert 9 is made as a cast from cast iron 25 in such a way that its guide surface is finely turned and ground.

The sliding plates 4 and 4 'are made of sheet metal 23 mm thick and made of St 37 material, the sliding surfaces are planed, a semicircular cutout 0 182 mm is cut autogenously.

The work table 6 is made of sheet metal 18 mm thick and made of material St 37 in a welded version (manual electric welding).

The flank guide strip 5 is made of a steel strip 20 mm thick and made of St 37 material; it also has an eutogenically cut outer shape and milled longitudinal openings for attachment.

The machine housing 8 is made of sheet metal 20 mm thick and made of material St 37; this material is autogenously cut and welded (electric manual welding).

The fixed axis 3 m is made of a round steel bar St 50 K; Neck and forehead are turned; A hole of 8.16 mm is drilled out on the axle and the M 10 thread is cut by hand.

Claims (1)

1. Machine for surface finishing of short and thin workpieces which are too small to be clamped during the finishing process, consisting of a working table supporting a moveable slide plate and a stationary slide plate determining the slide path of the stated workpieces, it being possible to move the working table in at least two planes, furtheron consisting of at least one spindle for transmitting the driving force upon the milling head, of a pair of flank guide strips and a vertically adjustable upper slide guide for guiding said workpieces in the direction of said milling head, said milling head having a concentric hollow end face being provided with peripheral interchangeable sharp cutting edges, furtheron consisting of a guide insert, insertable into said hollow end face of said milling head, the said workpieces when sliding along the said milling head are held by said guide insert characterized in that the guide insert (9) is in the form of an element detachable from the stationary slide plate (4) and being secured by means of screws (12) directly to but one of both flank guide strips (5).

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