JP5902901B2 - Main spindle for machine tools - Google Patents

Description

The present invention relates to a machine tool, and more particularly, to a spindle provided with a protruding tool for preventing chattering during product (workpiece) machining.

      For machine tool spindles, particularly large spindles in large horizontal boring machines, portal machining centers, etc., it is common practice to machine necessary workpieces such as boring with various types of tools attached directly to the spindle. .

Furthermore, through the snout for extending such that the auxiliary tool attached to the spindle, for example, angle head and for changing the processing direction, or a tool attached to the tip of the main shaft more tip, various cutters, drills Alternatively, a tool to which a cutting edge tip or the like is attached is attached to a spindle according to the purpose, and processing is performed in accordance with various kinds of workpieces.

In such a tool, the tool is often attached to the tip of the spindle via a snout depending on the workpiece to be machined. For this reason, the main shaft extends in a cantilever state from the machine body, and the moment at the machining point increases, which may cause vibrations and chatter due to sagging, distortion, etc. of the main shaft during processing. For this reason, it was often difficult to maintain the processing accuracy of the product (workpiece). In particular, in the processing of thin plate-like workpieces, prevention of chattering has been a problem.

Conventionally, a tool as shown in FIG. 4 disclosed by the present applicant is known in order to prevent sagging, distortion, and chatter during processing. The tool main body 1 of the tool shown in the figure is provided with an arbor 4 below the neck of a shank 3 attached to a rotating main shaft 2 indicated by a chain line of a machine tool (for example, a horizontal boring machine). The arbor 4 has a boring head 6 with a cutting edge tip 5 attached to the tip. Since the shank 3 has a long neck and a chatter phenomenon occurs, two or three concave grooves 7 are provided in the axial direction along the outer periphery of the arbor 4. It is gold.

JP-A-9-155605

      However, the above-described technique is only a technique devised with respect to the tool body, and chattering or the like may become prominent particularly in processing when the work is a thin work such as a plate shape.

An object of the present invention is to provide a spindle for a machine tool provided with a tool for preventing chattering, which is less likely to occur even when the spindle is attached with a snout as described above, and particularly when the workpiece is thin, such as a plate. There is.

For this purpose, a tool having a support on the outer side of the machining range of the workpiece and a spherical bearing corresponding to the tilted state of the workpiece, a rotating shaft to which a cutter constituting the main shaft is attached, and a quill fitted to the rotating shaft And a snout attached to the tip of the quill, and a rotating shaft provided between the snout and the work, supported from the outside, and an abutment that places the tip in the outer region of the work range of the work is provided to prevent chattering. The conclusion was reached that the present invention was reached.

In order to achieve the above-mentioned object, the present invention provides a screw provided on a snout in a main shaft having a rotary shaft provided at a spindle head of a machine tool, a quill fitted to the outer peripheral surface thereof, and a snout attached to the tip of the quill. A stopper that is screwed into the bracket, a bracket that has a spherical bearing at the opposite end of the stopper, a spherical body that fits into the spherical bearing of the bracket, and the other end that is bifurcated. A spindle for a machine tool is provided, which is provided with an extruding tool having a support base in contact with the head and a slip stopper attached to the other end of the support base.

According to the present invention, it is possible to realize a protruding tool provided between a snout attached to a quill fitted to the outside of a rotating shaft constituting the main shaft and a work, and a rotation in which a cutter or the like is attached by the main shaft to which the tool is attached. The thrust force applied to the shaft is reduced, and the tool, the main shaft, and the machine tool and the machining method that are less prone to chattering are obtained by using the tool, the spindle, and the use of these.

It is the schematic of the main-axis part of the machine tool (horizontal boring machine) with which this invention is applied. It is the schematic of the main axis | shaft of the machine tool to which this invention is applied, and is explanatory drawing of the expanded AA cross section of FIG. It is explanatory drawing when a workpiece | work inclines in the schematic of the main axis | shaft of the machine tool to which this invention is applied. It is explanatory drawing which shows the tool reinforced with the conventional superalloy material etc.

How then an embodiment of the present invention, taking a horizontal boring machine as an example of a machine tool using a spindle for a machine tool of the invention in this by 1 to 3, is processed using these of the present invention Etc. will be explained.

    In FIG. 1, reference numeral 10 denotes a type of machine tool, a horizontal boring machine, which is fixed on a floor surface F using a bed 11. A column base 13 mounted with a column 12 movable along the guide surface in a direction perpendicular to the paper surface is fixed on the bed 11. A spindle head 14 that can move up and down by a predetermined distance along a guide (not shown) is attached to the side surface of the column 12.

    A spindle 15 having a quill 15 incorporated in the spindle head 14 so as to be movable in the horizontal direction and a rotating shaft 16 fitted in the quill 15 is built in the spindle head 14. Rotation and axial movement are performed by a drive mechanism including a motor and the like. Reference numeral 18 denotes a snout, which has a screw portion 19 provided at the tip, and a nut is screwed into the screw 19 portion to form a stopper 20.

    FIG. 2 is an enlarged cross-sectional view taken along the line AA of FIG. 1, and reference numeral 21 denotes an ejecting tool, which will be described in more detail with reference to FIG. 2. The snout 18 is in contact with the stopper 20, and the opposite end of the stopper 20 includes a spherical bearing 22. Furthermore, it has a bracket 25 provided with a thrust bearing 23 and a spring 24 for receiving an axial pressing force. Further, the bracket 25 has an outer side surface B in the machining range of the work 27, in which a right end in the drawing is fitted into the spherical bearing 22 and a left end in the drawing is bifurcated. A support base 28 in contact with is provided. An anti-slip 29 made of rubber, resin, metal or the like is provided at the contact portion of the support base 28 with the work 27.

    FIG. 3 shows a machining state in which the surface B of the work 27 is slightly inclined and is not perpendicular to the rotation axis. Even in such machining with the workpiece tilted, the configuration as described above is employed. Therefore, in machining using this spindle, the surface B of the workpiece 27 is slightly tilted as shown in FIG. Even if it is not perpendicular, machining with less chatter can be expected within the movable range of the spherical bearing 22.

Since it has the configuration as described above, the main shaft of the present invention eliminates the initial fried defects and realizes machining with less chatter.

In the above-described embodiment, an example in which the main shaft uses a snout type tool has been shown. However, the present invention is not limited to this form, and other forms are possible. For example, you may comprise so that it may mount in a main axis | shaft using the thing of the taper shank type used for a general tool form, without using a snout. Of course, it may take the form of an angle head . In this case, it is advantageous to use a stopper on the non-rotating part of the main shaft as a means for preventing the support base that supports the workpiece from rotating. If more inconvenient regarding the shape between the automatic tool changer apparatus, it is conceivable to be manually exchanged.

    Furthermore, various ideas may be made for the slip stopper at the tip of the support base 28.

Further, the slip stopper 29 at the tip of the support base 28 may be variously devised. For example, it may be a spindle having a non- slip tool in a form that is a simple spherical bearing system. Even if the tilt of the workpiece increases, it can respond more flexibly.

10 Horizontal boring machine 11 Bed 12 Column 13 Column base 14 Spindle head 15 Quill 16 Rotating shaft 17 Spindle 18 Snout 19 Screw part 20 Stopper 21 Extrusion tool 22 Spherical bearing 23 Thrust bearing 24 Spring 25 Bracket 26 Spherical body 27 Work 28 Support base 29 Non-slip

Claims (1)

In a spindle having a rotary shaft provided at the spindle head of a machine tool, a quill fitted to the outer peripheral surface of the rotary shaft, and a snout attached to the tip of the quill
    A stopper screwed into a screw provided in the snout;
    A bracket with a spherical bearing on the opposite end of this stopper;
    One end is a spherical body that fits into the spherical bearing of the bracket, the other end is bifurcated, and a support base that contacts the outer region surface of the workpiece processing range;
    A non-slip attached to the other end of the support;
    A spindle for a machine tool, characterized in that a projecting tool is provided.

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