CS197259B2 - Cutter with universal head - Google Patents

Description

The invention relates to a milling machine of the universal milling head type.

The cantilever milling machine, which is perfectly suited for machining relatively small light workpieces, has the following disadvantages in terms of heavy and bulky workpieces:

The vertical movement of the bracket, which carries the table and workpiece to be machined, is difficult to accomplish and requires a weight-proportional motor, making it necessary, at least in some cases, to amplify the entire kinematic feed chain, which is unnecessarily strong for others. moves. When the table is moved out of its center position, the weight of the heavy workpiece deflects the entire bracket from where it is located, so that geometric accuracy is no longer respected. The length of the table is necessarily the length of the console that determines the length of its guide.

The invention has the advantage of avoiding all these drawbacks. The accuracy of the machine is no longer influenced by the position of the table, the required motor power for feeds is the same for all directions of movement and the table length can be theoretically unlimited.

The milling machine according to the invention is of the universal milling head type supported by a slide extending transversely to the table, and is based on the table being mounted for longitudinal displacement on a fixed bed located directly on the ground, the bed including a ground resting and bolted laterally to the bed on which it slides by means of a vertical guide, the bracket carrying the guide on which the ram moves.

The invention further enables the following arrangements:

a) The support arm is attached to the ram, either directly or via the universal head, and the support arm carries the stools supporting the milling spindle.

b) The machine comprises at least one vertical column attached to the bed, attached by means of a connecting piece to the support arm and forming a rigid closed frame therewith.

c) The machine incorporates a horizontal headstock for the spindle mounted on the slide.

d) The headstock performs the function of a cover comprising a reduction gear for driving the spindle.

The invention is illustrated in the accompanying drawings, in which: Fig. 1 is a front view of the machine according to the invention; Fig. 2 is a side view of the machine according to Fig. 1; Fig. 3 another side view showing the closed frame arrangement; 5 shows a side view of the variant according to FIG. 4 and FIG. 6, a schematic cross-section along the line A-A in FIG. 4. FIG.

It can be seen from the drawings that the table 1 (FIGS. 1 to 6) is moved longitudinally along a fixed bed 2 located directly on the ground. The bracket 3 is moved vertically on the guides of the stand 4 assembled in a non-detachable connection with the bed

2. The bracket 3 is balanced by means of a chain or cable and counterweights in the rack 4 with classic patterns that cause the counterweight to sink as the bracket 3 rises. These arrangements are not shown.

The drive means for moving the bracket 3, preferably the worm, therefore need never exceed the weight of the bracket 3. The slide 5 is supported by the guides of the bracket 3 and transversely moves on it. On its front side it carries a known universal milling head 6, by means of which the spindle 7 can be adjusted parallel to the table 1 (FIG. 1j, vertically (FIG. 2), horizontally and perpendicular to the table 1 (FIG. 3) and The motor 8 (Fig. 1) for rapid traversing and displacement drives the displacement gearbox mounted in bed 2. The kinematics system of the classical design allows the rapid displacement and traversing of the milling to be switched on and off, thereby ensuring horizontal displacement at table 1, vertical in the bracket 3 and transverse in the slide 5, in both opposite directions.

In addition to the motor drives, said movable parts 1, 3, 5 can also be driven by handwheels located partly on the front of the machine, partly on the left, which allows the best possible tracking of the tool and workpiece at work. The handwheels 9, 10 (Figs. 1, 2 and 3) serve for the longitudinal movement of the table 1, the handwheels 11, 12 for the vertical movement of the bracket 3, and the handwheels 13, 14 for the transverse movement of the slide.

In order to increase the rigidity of the assembly, especially when working with a milling cutter or a set of milling cutters mounted on a common mandrel far from the spindle head, the universal milling head 6 carries a support arm 15 (Fig. 3) attached to two columns 16 mounted in the bed 1 by means of a connecting piece 17.

The support arm 15 carries one or more lunettes 18 which support the milling arbor between or near the milling cutters carried therein. The support arm 15 (FIG. 3), the columns 18, the bed 2, the stand 4, the bracket 3, and the slide 5 form a closed frame, which is characterized by high rigidity.

If a milling cutter with a very large diameter is to be used, or the machine is specialized in horizontal milling by moving the table 1 longitudinally, there is a version (Figs. 4, 5 and 6J) where the milling arbor is mounted in the spindle 19. the spindle 19 is entrained by a reduction gear formed around 21 (FIG. 6), fixedly mounted on the spindle 19, and a pinion 22 seated on the output shaft of the ram 5.

The spindle axis is thus at a distance from the support arm 15, allowing the assembly of a larger diameter milling cutter and the arrangement of a more significant pair of forces to accommodate a large diameter milling cutter.

Claims (5)

A universal head milling machine supported by a slide moving transversely to a table, characterized in that the table (1) is mounted to a longitudinal displacement on a fixed bed (2J) located directly on the ground, with a stand (4) attached to the bed (2). also resting on the ground and bolted laterally to the bed (2) and sliding on it by means of a vertical guide, the bracket (3) carrying the guide on which the slide (5j) is moved. Milling machine according to claim 1, characterized in that a support arm (15) is attached to the slide (5J), directly or by means of a universal head (6j), and carries lunettes (18) supporting the milling spindle (7). vynalezu The milling machine according to claim 2, further comprising at least one vertical column (16J) attached to the bed (2) connected by a connecting piece (17J) to the support arm (15) and forming a rigid closed frame therewith. The universal head milling machine according to Claims 1 to 3, characterized in that it further comprises a horizontal headstock for the spindle (19) on the side of the ram (5). The milling machine according to claim 4, characterized in that the headstock forms at the same time a cover comprising a reduction gear consisting of a wheel (21) and a pinion (22) for driving the spindle (19). 3 sheets of drawings