DE1427752B

DE1427752B - Process for face milling the side surfaces of blocks or slabs made of hardened lightweight concrete or other brittle material

Info

Publication number: DE1427752B
Authority: DE
Inventors: Olaf; Brage Hans-Olof; Skövde Kjell-Berger (Schweden)
Original assignee: Ingenjörsfirma Hebe Aktiebolag, Örebro (Schweden)

Description

Hierbei wird zunächst mit Hilfe eines zylindrischen Fräsers 27 eine Schrägfläche 26 abgespant. Mit den beiden Scheibenfräsern 12 a, deren Schneiden nahe der Unterkante 25 der Seitenflächen einlaufen und an der vorzugsweise unter einem Winkel von 45° gegenüber den Seitenflächen verlaufenden Schrägfläche 26 auslaufen, werden anschließend die Seitenflächen plangefräst.In this case, an inclined surface 26 is first removed with the aid of a cylindrical milling cutter 27. With the two disc milling cutters 12 a, the cutting edges of which run in near the lower edge 25 of the side surfaces and terminate at the inclined surface 26, which preferably extends at an angle of 45 ° with respect to the side surfaces, the side surfaces are then milled flat.

Die Fräser 18 und 27 nach F i g. 4 und 5 sind im allgemeinen in solcher Richtung angetrieben, daß ihre Schneiden in das Material an der Kante zwischen benachbarten Seitenflächen einlaufen und an der zu bearbeitenden Seitenfläche auslaufen. Es ist aber auch eine entgegengesetzte Antriebsrichtung möglich.The milling cutters 18 and 27 according to FIG. 4 and 5 are generally driven in such a direction that their cutting edges run into the material at the edge between adjacent side surfaces and on run out of the side surface to be machined. But it is also an opposite drive direction possible.

F i g. 6 zeigt eine bevorzugte Ausführungsform für die Scheibenfräser. Der hier gezeigte Scheibenfräser besteht aus einer Scheibe 31, an der über Werkzeughalter 33 Schneiden 34 eingesetzt sind.F i g. 6 shows a preferred embodiment for the side milling cutters. The side milling cutter shown here consists of a disk 31 on which cutting edges 34 are inserted via tool holders 33.

Wenn die Schrägflächen nur an einer Kante abgespant werden sollen, wie dies beispielsweise mit ίο den Fräsern 18 und 27 durchgeführt wird, kann dies auch mit einem anderen Schneidwerkzeug, beispielsweise einem Hobel od. dgl., erfolgen.If the inclined surfaces are only to be machined on one edge, as is the case with, for example ίο the milling cutters 18 and 27 is carried out, this can also be done with another cutting tool, for example a plane or the like.

Hierzu 1 Blatt Zeichnungen1 sheet of drawings

Claims

Claim:

Method of face milling the side surfaces of blocks or plates made of hardened lightweight 5 concrete or other brittle material, in which to avoid breaking the longitudinal edges the side surface to be processed successively by two partially overlapping Stock removal is generated in two partial areas, 10 after the stock removal of a first partial area the second partial surface is removed by milling using a side milling cutter so that the Cutting edges after passing through the cut small edge strips with a disc milling cutter The entire width of the side surface is completely machined and thus a completely flat side surface without steps or the like. Nevertheless, the previous stock removal results in a slightly inclined Inclined surface avoids breaking out on the run-out side of the side milling cutter. The processed according to the invention Blocks or slabs can therefore be laid with very narrow joints.

The invention is explained in more detail below with reference to schematic drawings of exemplary embodiments explained.

In the embodiment according to FIGS. 1 to 3 is a block 1, the side surfaces 2 of which are milled flat d ll i ih ii

area run out on the first sub-area, 15 should be, in the direction of the drawn

characterized in that the first Partial surface to the second partial surface at an angle of 2 to 45 °, in particular 5 to 10 °, is generated inclined.

Moved through one after the other between two consecutive opposite side milling cutters 3, 3 ' and 12, 12' . The milling cutters 3, 3 'of the first pair of milling cutters are each arranged inclined at such a small angle according to FIG. 2 that an inclined surface 6 is machined on the side surfaces 2, as shown in FIGS. 1 and 2 is indicated by the areas 7, 8 and 9. The milling cutters 3 and 3 'are driven in such a way that their cutting edges 11 are on the underside

Planfrüscn the side surfaces of blocks or Panels made of hardened lightweight concrete or other brittle material, in which to avoid the Breaking out the longitudinal edges to be processed

the side surfaces 2 run out. The milling cutter 3 'is set in such a way that breakouts are avoided. At the According to the method of the invention, the milling cutter can also be set in such a way that its cutting edges are approximately

Side face one after the other through two cutting edges partially overlapping one another within the upper side of the block near the top overlapping chipping in two partial areas, as shown in the case of the milling cutter 3 according to FIG
Subarea the second subarea by milling using

a side milling cutter is removed so that the

is indicated. In this case, breakouts are to be feared, but these can then be eliminated again by the subsequent milling cutter 12.

Cutting edges after passing through the cutting area 35 The milling cutters 12 and 12 ' are set so that their run out on the first partial surface. Cutting surfaces in the plane of the finished side

It is a process of this type is known (German surfaces are 14, that is, they are generally Patent 1,001,943) arranged at the two parallel to one another and parallel to one another at right angles to the upper side and aligned in the height of the block counter. These milling cutters are driven one after the other in staggered disk milling cutters 40 in such a direction that their cutting edges 11 are machined from two parallel partial surfaces. Enter the block on its upper side. This ensures that the cutting edges of the two milling cutters 12 'are removed from the material left longitudinally driven by milling cutter 3' in the opposite direction, while the material left by milling cutter 3 in the approximately middle of the side milling cutter 12 to be machined is removed surface-lying dividing line between the two 45 broken edge 13 is chipped. Both partial surfaces run out and breakouts on the milling cutters 12 and 12 'emerge from the inclined surface 6, longitudinal edges of the side surface are avoided. Somewhat above and at least in the vicinity of, with this known method there is the risk of its lower edge from falling off, so that the resulting plane usually has a remaining sequence of setting errors on the finished bevel 15 when the milling cutter or side surface 14 is unevenly worn However, the side surface that is generally so worked along the dividing line between is narrow that it does not disturb any further and in the extreme of the two partial surfaces a step remains, which in case is practically no longer present. When the blocks or plates are joined together, the process according to the invention thus creates separating joints of the same width. a flawless flat side surface without breakouts

Es ist Aufgabe der Erfindung, ein Verfahren der 55 und Stufen.It is the object of the invention to provide a method of 55 and stages.

eingangs erwähnten Art zum Planfräsen der Seiten- Bei dem Ausführungsbeispiel nach Fig. 4 wirdIn the embodiment according to FIG

flächen von Blöcken oder Platten so weiterzubilden die Schrägfläche 19 durch zwei konische Fräser 18 und zu verbessern, daß nicht nur Ausbrüche an den abgespant. Diese Schrägfläche 19¹ erstreckt sich von Längskanten der Seitenflächen, sondern auch Un- der Unterseite des Blockes aus nach oben nur über ebenheiten oder Stufen auf der fertig bearbeiteten ⁶° einen kleinen Teil der Höhe der Seitenfläche 2. Die Seitenfläche vermieden werden. nachfolgenden Scheibenfräser 12 und 12' arbeitensurfaces of blocks or plates to further develop the inclined surface 19 by two conical milling cutters 18 and to improve that not only breakouts on the machined. This inclined ^{surface 19 1} extends from the longitudinal edges of the side surfaces, but also from the underside of the block upwards only over flatnesses or steps on the finished ⁶ ° a small part of the height of the side surface 2. The side surface can be avoided. work the following disc milling cutters 12 and 12 '

Diese Aufgabe wird, ausgehend von einem Ver- wieder, wie an Hand von F i g. 1 beschrieben, und fahren der eingangs erwähnten Art, erfindungsgemäß deren Schneiden treten wieder jeweils innerhalb der dadurch gelöst, daß die erste Teilfläche zur zweiten Schrägflächen 19 aus, wie dies in Fig. 4 durch die Teilfläche unter einem Winkel von 2 bis 45°, ins- «5 Linie 20 angedeutet ist.This task is, based on a ver, as shown in FIG. 1, and drive of the type mentioned, according to the invention their cutting occurs again within the solved in that the first partial surface to the second inclined surfaces 19, as shown in Fig. 4 by the Partial area at an angle of 2 to 45 °, ins- «5 line 20 is indicated.

besondere 5 bis 10°, geneigt erzeugt wird. Fig. 5 zeigt, wie gemäß der Erfindung zwei be-particular 5 to 10 °, inclined is generated. Fig. 5 shows how, according to the invention, two

Bcim erfindungsgemäßen Verfahren wird beim nachbarte Seitenflächen 2 eines Blockes 1 plangefrästIn the method according to the invention, the adjacent side surfaces 2 of a block 1 are plane milled

zweiten Abspanen bis auf einen vernachlässigbaren werden können, und zwar vorzugsweise gleichzeitig.second stock removal can be negligible except for a negligible, preferably at the same time.