JPS63212448A - Selection type double-row heads device of machine tool - Google Patents

Abstract

PURPOSE:To reduce the none-required time as much as possible, in an NC machine tool such as a copy milling machine, by arranging a plurality of heads parallelly at the spindle head in Z direction, and by installing heads for different purposes with possibility of motion adjustment individually. CONSTITUTION:A model is installed on a table during digitizing operation by model copying, and a processing head 12 is held retracted upward by a feed screw 17 for attachment, and a tracer head 13 is fixed protrudingly to the underward working position. The tracer head 13 is equipped with a stylus 26, and servo motors for the reflective shafts are driven through a controller, and the signals from location sensors for the respective shafts are fed back to the controller to perform copying actions, wherein the data of model contour are stored in a memory. Then the tracer head 13 is retracted upward, and the processing head 12 is fixed protrudingly at the specified working position, and the work is processed into the same figure as the model. Fitting of an appropriate grinding head 27 permits performing die grinding.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a numerically controlled machine tool equipped with an XYZ three-axis drive device, such as an alternative double-row head device of a machine tool, such as a copy milling machine or a machining center with a spindle-mounted tracer. .

Digitizing using a no-load copying function, which is one means of creating NC data for conventional mold machining, was an on-the-machine type using a copy milling machine or a tracer mounted on the machining center spindle.

Furthermore, conventionally, tracers were arranged in parallel on the spindle head of a numerically controlled machine tool, and the tracers were moved up and down as necessary.

On-the-machine digitizing using a conventional copy milling machine or a machining center with a spindle-mounted tracer has the problem that the expensive cutting capacity function is not utilized during digitizing and becomes irrational.

Additionally, conventional numerically controlled machine tools with tracers arranged in parallel on the spindle head only move the tracers up and down, which can sometimes cause interference between the machining head and the model during digitizing. In order to avoid this, it is necessary to make the protruding stroke of the tracer large. Therefore, the distance from the support point to the tip of the tracer becomes large, which causes structural difficulties and instability, and also reduces the inertia of the two wheels. was large, impairing the imitation function.

The present invention has been proposed in view of the above-mentioned conventional problems, and
In a numerically controlled machine tool equipped with a Yz 3-axis drive device, multiple heads with different work purposes are arranged in parallel on the spindle head that can be controlled and driven in the X-axis direction, and each head is selectively placed in the work position. Each head is installed so that it can be moved and adjusted independently in the X-axis direction in order to set the other heads to a non-working position, and each head can be replaced with attachments for different work purposes. It is something.

According to the present invention, for example, during digitizing, by protruding the tracer head to the working position and retracting other heads (processing heads, etc.) to the non-working position, other heads can prevent interference with the model. prevent.

In this case, instead of simply protruding the tracer head to the working position as in the past, the other heads are retracted to the non-working position, thereby avoiding the above-mentioned problem caused by the elongation of the tracer head's protruding stroke. .

In addition, by attaching attachments for different work purposes to each head, in addition to digitizing functions, measurement, model processing,
Multifunctionality such as graphite electrode processing and mold FiFw by self-copying becomes possible, and idle time can be utilized.

Emperor 1! FIG. 1 is a schematic perspective view of a copy milling machine to which the present invention is applied, in which (1) is a fixed table;
2) is a column, (3) is a slide arm mounted on the column (2) so as to be movable in the X-axis direction, (4) is an X-axis servo motor, and (5) is an X-axis ball screw. It constitutes a device that drives the slide arm (3) on the column (2) in the X-axis direction via a pole nut (not shown).

(6) is a saddle attached to the slide arm (3) so that it can move in the Y-axis direction, (7) is a Y-axis servo motor, (8)
has a Y-axis ball screw and a pole nut (not shown)
(9) constitutes a device that drives the saddle (6) in the Y-axis direction relative to the slide arm (3) via the spindle head (9), which is attached to the saddle (6) so as to be movable in two axes. ,(
10) is a two-axis servo motor, and (11) is a two-axis ball screw, which connects the spindle head (
9) in the X-axis direction with respect to the saddle (6). (12) is a processing head, (13) is a tracer head, which is attached to the spindle head (9) so that it can move independently in the X-axis direction. (14) controls and drives each axis servo motor. NG controller (14) for each axis servo motor.
A command is issued, and the current position is fed back from each servo motor to the controller (14) by a position detector.

As shown in Fig. 2, the relationship between the saddle (6) and the spindle head (9) is such that a Z-axis servo motor ( 1o) are connected, and a pole nut (15) fixed to the spindle head (9) is screwed in the middle. In FIG. 2, (16) is a pole nut fixed to the IT+F lever (6) and screwed onto the Y-axis ball neck 8) of the slide arm (3).

As shown in Figure 3, the main shaft II (9) has an attachment feed screw (17) parallel to the two-axis ball screw 11).
) (17) is rotatably supported on the shaft, and a slide plate (19) (19) to which a nut (18) (18) that is screwed into the attachment feed screw (17) (17) is fixed is attached to the second WJ. As shown, the spindle head (9
) so that it can move in two axes.

To the above slide plate (19) (19), attach the rad nose (20) to the processing and the rad nose (21) to the tracer.
are attached as shown in Fig. 2, and each has an attachment clamp screw 22). In Fig. 2, only the tracer nose (21) is attached to the slide play (19). Although the case is shown in the figure, the processing head nose (20) can also be configured in the same way.

As shown in Fig. 3, a processing head (12) is detachably attached to the rad nose (20) for the above processing, and a cutting tool (23) is detachably attached to the processing head (12). A collet chuck (24) is installed for cutting tools (23) and collet chucks (24).
is connected to a spindle drive motor (25) mounted on the processing head nose (20).

Stylus (26) for tracer nose (21)
A tracer head (13) is attached.

In FIG. 3, (27) is an IS head, which has a rotatable grindstone (28) at its tip, and is partially equipped with a coupler (29) for connecting an air source.
2) can be attached to the processing head nose (20), and connected to the spindle drive motor (25) to drive the grindstone (2).
8) can be rotated.

The processing head nose (20) has a processing head (12
), N polishing head (27), and a speed increasing head (not shown) can also be replaced and installed.

The attachment feed screw (17) (17) can be rotated manually or by a motor, and the cutting tool (23) or stylus (
26) can be adjusted in two axial directions. still,
In FIG. 3, (30) is a terminal box provided on the spindle head (9).

The embodiment of the present invention has the above configuration, and an example of the operation will be described next.

First, during digitizing work by copying the model, the model is mounted on the table (1), and the processing head (12
) is retracted upward by the attachment feed screw (17), and the tracer head (13) is projected and fixed to a lower working position by the attachment feed screw (17). The tracer head (13) has a stylus (
26) is attached, the servo motors of each axis are driven via the controller (14), and the signals from the position detectors of each axis are fed back to the controller (14) to perform the copying operation, and the shape data of the model is is stored in the storage device.

Next, the tracer head (13) is retracted upward by the attachment feeder 17), and the processing head (12)
) is projected and fixed at a predetermined working position by an attachment feed screw (17), and the workpiece material fixed to the table (1) is processed into the same shape as the model based on the model shape data.

When the model processing is finished and the mold cutting is finished using another copy milling machine, etc., the mold is fixed on the table (1), the processing head (12) is removed, the polishing head (27) is attached, and the mold is polished. can be made to do so. In this case, the self-copying function is used to perform the polishing, and the wear of the grinding wheel is automatically compensated for, and constant contact pressure (polishing pressure) is always used for constant pressure polishing. It can be applied to polishing various shapes such as surfaces.

Further, instead of the machining head (12), a graphite electrode or the like can be attached to perform electrical discharge machining, and further, digitizing and measurement can be performed using the tracer head (13).

Although the embodiment in the drawings illustrates a case with two heads, a processing head and a tracer head, it can also be applied to a case with two or more heads, and each head or only a part of the heads can be replaced, and further, It can also be applied to numerically controlled machine tools with moving tables.

According to the present invention, in addition to the digitizing function of a copy milling machine or a machining center with a spindle-mounted tracer, it can be used for multipurpose operations such as measurement, model processing, graphite electrode processing, and mold polishing by self-copying. It has the advantage of reducing idle time as much as possible and making effective use of it.

In addition, since each head can move independently in the Z-axis direction, it is possible to prevent other heads from interfering when working with one head, and to shorten the protrusion stroke of each head. Since the inertia of each head in two axial directions can be reduced, the accuracy of the copying work can be improved, and it is also advantageous in terms of the support structure.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view of a copy milling machine to which the present invention is applied, and FIG. 2 is a side view showing the relationship between its saddle and spindle head.
FIG. 3 is a front view of the spindle head. (1) ---Table, (2) ---Column,
(3)--Slide arm, (4)--X-axis servo motor, (5)--X-axis ball screw, (6)--Saddle,
(7) - Y-axis servo motor, (8) - Y-axis ball screw, (9) - Spindle head, (1
0) ---2-axis servo motor, (11) ---2-axis ball screw, (12) --- processing head, (13) --- tracer head, (14) --
・Controller, (17) −・Feed screw for attachment, (1B) −Nut, (19) −・−
Slide plate, (20)... Processing head nose, (21) --- Tracer head nose, (22) ---
Actuation clamp screw, (23)--Cutting tool, (24)--Collet chuck, (25)
)・−・−・Spindle drive motor, (26)・−Stylus, (27)・−Polishing head, (28)・−Whetstone. 11th!1

Claims (1)

[Claims] (1) In a numerically controlled machine tool equipped with an XYZ three-axis drive device, multiple heads with different work purposes are arranged in parallel on a spindle head that can be controlled and driven in the Z-axis direction, and each head is adjusted to the work position. In order to set the other heads to non-working positions, each head is installed so that it can be moved independently in the Z-axis direction, and each head is replaced with attachments for different work purposes. A selective double-row head device for a machine tool, which is characterized by the following: