JPH0526615B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a machine tool, and particularly to a machine tool suitable for automatic machining of various shafts.

2. Description of the Related Art Shafts used in various machines have a keyway around the shaft for transmitting driving force, and a screw hole is drilled on the end face for mounting a driven object. Depending on the purpose, the peripheral surface may be tapered or threaded.

In the past, in order to machine the outer circumferential surface of the shaft and the various parts mentioned above, the workpieces were sequentially changed to a centering machine, lathe, cylindrical grinding machine, key milling machine, and end face drilling machine, which required manual labor to change the setup. However, there were drawbacks that hindered work efficiency.

Recently, in order to improve the productivity of heavy workpieces, the workpiece is fixed on a table that can be moved in the longitudinal direction, and the workpiece is fixed on a table that can be moved in the longitudinal direction, and the workpiece is moved in the direction perpendicular to the direction of movement and in the direction perpendicular to the table surface. So-called five-sided machining centers have emerged that have a tool head that is movable and pivotable about an axis perpendicular to the table surface. With this device, it has become possible to mill and end mill the top and four sides of a workpiece set on a table without changing setups, but it is also possible to perform milling and end milling on the top and four sides of a workpiece set on a table, but it is also possible to perform milling and end milling on the top and four sides of a workpiece set on a table. This device is not suitable for processing.

Purpose of the Invention In view of the above-mentioned circumstances, an object of the present invention is to provide a machine tool that can automatically process a workpiece, particularly a shaft, without changing the workpiece setup.

Means for Achieving the Object In order to achieve the above object, the machine tool according to the present invention includes a longitudinally movable table, and a longitudinally movable table provided on the table near both longitudinal ends thereof, A pair of rotating support means that can hold both ends of the workpiece and rotate it around its axis and be retracted from the workpiece, and each of the pair of rotational support means can be retracted from and retracted from the table on the table center side of each of the pair of rotational support means. a pair of fixed support means for fixedly supporting the workpiece on the table at the same axis position as the workpiece supported by the rotation support means when the workpiece is protruded; is independently movable in a plane perpendicular to the direction of movement of the table, in directions parallel and perpendicular to the table surface, and pivotable around an axis perpendicular to the surface of the table, and equipped with suitable turning tools and It has a tool head on which rotating tools can be selectively mounted.

Function Since the machine tool of the present invention is configured as described above, both ends of the workpiece are held by the rotating support device on the table and the workpiece is rotated around its axis, a turning tool is attached to the tool head, and the table is moved back and forth. By moving in the direction, it is possible to turn the circumferential surface of the workpiece in the same way as with a lathe. By replacing the tool attached to the tool head with a milling tool using ATC, it is possible to mill key grooves, etc.

After machining of the circumferential surface of the workpiece is completed, the workpiece is supported by the fixed support means and retracted from the rotation support means and the workpiece, so that both end surfaces of the workpiece can be machined. Therefore, by attaching a tool suitable for each processing to the tool head, milling of the end face and threaded hole processing can be performed.

As described above, according to the machine tool of the present invention, once the workpiece is set on the table, the supporting means is automatically switched between the rotating supporting means and the fixed supporting means by NC control, and the tool attached to the tool head is automatically switched between the rotating supporting means and the fixed supporting means. By replacing the parts using ATC, all machining can be performed automatically using NC control.

Embodiments Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 is a diagram showing an embodiment of a machine tool to which the present invention is applied.

As shown in the figure, the table 1 is movable in the longitudinal direction.
A turning head stock 2 is provided near one end of the table 1 in the longitudinal direction, and two tail stocks 3 are provided near the other end, with their centers aligned. It is designed so that it can be set parallel to the longitudinal direction at the top.

Straddling the table 1, a gate-shaped frame 4 is provided fixed to a base. A guide rail is provided on the upper surface of the cross beam 4a of the gate-shaped frame 4, and a saddle 5a that supports the spindle head 5 so as to be movable up and down is movably mounted on the rail. A tool head 6 is provided at the lower end of the spindle head 5, and on its lower and side surfaces,
A turning tool 8a and a rotary tool 8b (see FIG. 2) are removable. The tool 8 is automatically exchanged according to a machining program by an ATC (automatic tool changer) 7 provided on one column 4b of the portal frame 4. The tool head 6 can be pivoted through 360 degrees around a vertical axis and held in any pivoted position.

Further, a pedestal 9 is provided on the center side of each of the turning head stock 2 and tail stock 3 of the table 1 so as to be retractable. For example, as shown in detail in FIG. 3, the pedestal 9 consists of a pair of members 11 and 12 with a V-shaped notch 10 facing each other, and the center of the notch 10 is centered between the turning head stock 2 and the tail stock 3. By aligning the height with the determined turning center of the workpiece and bringing the members 11 and 12 close to each other, the workpiece can be clamped and fixedly supported at the same axis position as in the case of turning. .

Further, a pendant operation panel 13 is provided at the front end of an arm extending forward from the upper end of the tool head, allowing setting and operation of machining programs.

Since this device is constructed as described above, the work on the shaft is held between the turning head stock 2 and the tail stock 3 on the table 1, the work is rotated by the turning head stock 2, the table 1 is moved in the front and back direction, and the tool head is rotated. By attaching a turning tool to 6, it can perform the same function as a lathe.

When the machining of the circumferential surface of the workpiece by turning is completed, the tool in the tool head 6 is replaced with a milling cutter, and the table 1 is moved without turning the workpiece, thereby machining the keyway on the circumferential surface of the shaft and performing finishing machining.

When machining of the shaft circumferential surface is completed, the pedestal 9 is raised above the table surface, and the workpiece whose both ends are supported by the turning head stock 2 and tail stock 3 is clamped and supported. evacuate from
As shown in FIG. 2, a milling attachment 8b is attached to the tool head 6, and both end faces of the workpiece are milled to form a screw hole.

By following the steps above, all workpiece processing can be performed unattended using NC.

The procedure for machining a shaft having a keyway on the cylindrical surface and a threaded hole on the end surface using the machine tool of the present invention has been described above. It is possible to hold the cylindrical surface, rotate it to any angular position, and hold it at that position.If an appropriate indexing function is added, it is possible to create grooves on the cylindrical surface at equal intervals, such as the mounting grooves for turbine blades. It is also possible to form a plurality of shafts, and in addition to machining cylindrical surfaces and conical surfaces, for example, as shown in FIG.
2. Machining of a shaft having a partially different cross-sectional shape due to the hexagonal cross-section 23 can be easily and automatically performed. In addition, by appropriately configuring the program, it is possible to create shafts with a "rice ball" cross section as shown in Figure 5, oval cross sections as shown in Figure 6, rotors of screw pumps as shown in Figure 7, etc. , it becomes possible to easily process members of various shapes using NC.

In addition, in the above embodiment, an example was shown in which two sets of workpiece rotation support devices were provided on the table, but this may be one set or three sets, and the support frame for the spindle head may be of a type other than a portal type. May be cantilevered.

Effects As described above, according to the present invention, once the workpiece is set on the machine tool, the machining can be completed automatically without changing the setup of members such as shafts of various shapes, which improves work efficiency. A remarkable effect can be obtained in improving the

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the configuration of a machine tool according to an embodiment of the present invention, Fig. 2 is a perspective view showing a rotary tool mounted on the tool head, and Fig. 3 is a side view showing an example of the cradle. , and FIGS. 4 to 7 are perspective views showing examples of members that can be machined with the machine tool of the present invention. 1...Table, 2, 3...Swivel support means, 4
... Spindle head support frame, 5... Spindle head, 6... Tool head, 7... ATC, 8... Tool, 8a...
Turning tool, 8b... Rotary tool, 9... cradle (fixed support means).

Claims (1)

[Claims] 1. A table that is movable in the longitudinal direction; and a table that is provided on the table so as to be movable in the longitudinal direction near both longitudinal ends of the table, and that is capable of holding both ends of a workpiece and rotating it around its axis. a pair of pivoting support means that can be retracted from the work; and each of the pair of pivoting support means is provided on the table center side so as to be able to protrude and retract from the table, and is supported by the pivoting support means when protruding. a pair of fixed support means for fixedly supporting the workpiece on the table at the same axial position as the axial position of the workpiece; A machine tool having a tool head that can move in directions parallel and perpendicular to the top surface of the table, can rotate around an axis perpendicular to the surface of the table, and can selectively mount appropriate turning tools and rotary tools. .