JPS6339371B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a machine tool, and particularly to a machine tool with a portal configuration in which a tool magazine is installed. The purpose is to reduce the size of the support table and bed, to accommodate a large number of tools, and to make it possible to change the setup of the next tool to be used during machining.

2. Description of the Related Art Machine tools are already known that sequentially take out necessary tools from a tool magazine placed on a support table on which a workpiece is placed and perform various types of machining continuously. However, in such machine tools,
The tool magazine is placed upright on the edge of the support table so as not to interfere with the machining of the workpiece, and when changing tools, the stroke is made larger than the range required for normal machining. For this reason, the working space on the support table has the disadvantage that the bed, table feeding device, etc. are necessarily enlarged in order to increase the size of the tool magazine.

The present invention has solved these conventional drawbacks, and its feature is that the guide member of the tool magazine is supported between the gate-shaped columns so that it can move forward and backward at a position directly below the spindle during tool exchange and at a position where it does not become an obstacle during machining. This guide member is equipped with a tool holder for holding a tool, and the slider is slidable in a direction parallel to the sliding direction of the main shaft and can be exchanged with the fixed guide member on the portal column. I supported it.

Embodiments of the present invention will be described below with reference to the drawings.

In FIGS. 1 to 3, 1 is a bed, 2 is a support table for a workpiece that is movably provided on the bed 1, and 3 is a gate that is placed on the bed 1 so as to straddle the support table 2. shape column, 4
A slide table 5 is supported on the upper part of the column 1 so as to be slidable in the horizontal direction, and a lift table 5 is supported by the slide table 4 so as to be vertically movable. This spindle head 6 is integrally provided.
A main shaft 7 rotatable about a vertical line is supported on the shaft. 9 is a motor for lifting and lowering the lifting table 5, and 10 is a motor for driving the main shaft.

In such a portal machine tool, a tool magazine 11 is installed between the left and right columns 3 and above the support table 2. That is, a support bracket 12 is fixedly installed between the left and right columns 3, and a pair of guide rods 1 are attached to the support bracket 12, the axes of which are oriented in the longitudinal direction that is perpendicular to the vertical direction of the main spindle head 6 and the sliding direction of the slide table 4.
3 is fixed. A frame 14 is guided and supported by the guide rod 13 so as to be movable forward and backward, and is connected to a driving cylinder device 18. A movable guide member 20 parallel to the sliding direction of the slide table 4 is fixed to the front end of the frame 14. Also, a pair of fixed guide members 20 fixed to the left and right columns 3
a and 20b are provided. and two sets of sliders 22 having a length that fits within the width of the movable guide member 20.
a, 22b, one set of which is a movable guide member 20
The other set is shiftably guided and supported by either the left or right fixed guide member 20a or 20b.
Of course, a large number of tool holders 16 are arranged on the sliders 22a and 22b.

Engagement shafts 23a and 23b are protruded from the upper surfaces of the sliders 22a and 22 at approximately central positions, and the engagement member 25 is crotch-shaped, with a pair of engagement elements 25 on the left and right.
a, 25b, which are the engagement shafts 23a, 23a, 25b.
3b. The piston rod end of a shift cylinder device 24 fixed to the column 3 is connected to a substantially central portion of the engaging member 25.

Next, the operation of the above embodiment of the present invention will be explained. First, the illustrated state shows the tool magazine 11 in its original position, that is, the frame body is retracted by the driving cylinder device 18. When returning the used tool 17 mounted on the spindle 7 to the tool magazine 11, the spindle head 6 is lowered in the vertical direction, and the spindle 7 is moved to the position corresponding to the empty tool holder 16. Position yourself by moving left and right in front of you. In this state, the frame body 14 is moved forward and the tool 17 mounted on the main spindle 7 is gripped by the tool holder 16, and then the well-known tool fastening device in the main spindle 7 is unclamped to release the tool 17. release.
After the tool is released, the tool 17 is pulled out from the spindle 7 by lifting the spindle 7 in the vertical direction, and the tool holder 1 is removed.
It remains held at 6. The main shaft 7 located at the rising end slides directly above the tool holder 16 holding the necessary tool 17. Then, the tool holder 16 holding the necessary tool 17 is positioned directly below the spindle 7, the spindle head is lowered again, the tool 17 is mounted on the spindle 7, and the tool holder 16 inside the spindle 7 is tightened using a well-known method. The tool 17 is clamped by the device.
Next, the frame body 14 is moved back and the tool magazine 11 is placed in a retracted position so as not to interfere with the machining of the workpiece, and at the same time, the main spindle 7 is lowered in the vertical direction and machining of the workpiece is started.

Further, in the figure, a slider 22a for holding a tool currently in use and a slider 22b for holding a tool to be used next time are guided by the movable guide member 20 and the fixed guide member 20b on the right side, respectively.
Therefore, in order to transfer the tool 17 necessary for the next machining from the fixed guide member 20b on the right side to the movable guide member 20, the tool 17 is first shifted to the left by the shift cylinder device 24 when the movable guide member 20 is in the retreat position. As a result, the slider 22a located on the movable guide member 20 moves to the empty left fixed guide member 20a, and the slider 22b located on the right fixed guide member 20b moves to the movable guide member 20a. 20, two sets of sliders 22a,
22b transfer is performed. In this state, a tool exchange operation is performed between the slider 22b guided by the movable guide member 20 and the main shaft 7 in the same manner as described above, and the slider 22a guided by the fixed guide member 20a is used for the next machining. Storage tool 17
A setup change is made. It is also possible to replace the slider located on the left or right fixed guide member 20a, 20b with a slider that stores a different type of tool prepared outside the machine.

As described above, according to the present invention, since the tool magazine is installed between the portal columns, the work space on the workpiece support table can be used effectively, and the stroke of the support table can be reduced more than necessary. There is no need to increase the size, so the support table and bed can be made smaller.

Furthermore, in the present invention, the tool axis in the tool magazine is oriented vertically, and the tool holder that holds the tools aligned parallel to the sliding direction of the main spindle can be shifted in the sliding direction of the main spindle. The axes of the required tool and spindle can be aligned by the horizontal sliding movement of the spindle and the shifting of the tool holder, and tools can be attached and detached with a simple device using the vertical movement of the spindle. This has the advantage that tool exchange can be performed reliably, and the advantage that more tools can be stored and used even if the slide range of the spindle is short.

Furthermore, in the present invention, since one of the plurality of sliders is slid and guided by the fixed guide member, there is an advantage that the stage of the tool magazine can be changed during machining.

[Brief explanation of the drawing]

Figure 1 is a side view of an embodiment of the present invention, Figure 2 is a side view of an embodiment of the present invention;
The figure is an enlarged view of the section shown by the arrow in FIG. 1, and FIG. 3 is a sectional view taken along the line of FIG. 2. 1... bed, 2... workpiece support table, 3
...Column, 4...Slide table, 5...Elevating table, 6...Spindle head, 7...Spindle, 1
1... Tool magazine, 12... Support bracket,
13... Guide rod, 14... Frame, 15... Support member, 16... Tool holder, 17... Tool, 1
8... Drive cylinder device, 20... Movable guide member, 20a, 20b... Slider, 23, 23
a, 23b...Engagement shaft, 24...Shift cylinder device, 25...Engagement member.

Claims (1)

[Claims] 1. A gate-shaped column is installed on the bed so as to straddle the workpiece support table, and a main shaft rotatable about a vertical line is mounted on the top of the gate-shaped column so that it can be raised and lowered in the vertical direction toward the workpiece support table, and In a machine tool that is supported so as to be slidable in a horizontal direction that is perpendicular to the lifting direction, between the left and right sides of the gate-shaped column, and between the workpiece support table and the main spindle, there is a support that is perpendicular to the lifting direction and the sliding direction of the main spindle. A movable guide member parallel to the sliding direction is provided so as to be moved forward and backward by a drive device in the direction of the movable guide member, and a fixed guide member aligned with the movable guide member in the retracted position of the movable guide member is provided on both sides of the movable guide member. A slider is fixed to a gate-shaped column and is equipped with a tool holder that holds a large number of tools on these movable guide members and fixed guide members so that the tool axes of the tools are oriented vertically and aligned parallel to the sliding direction of the main shaft. A shift device is provided on the portal column for slidingly guiding each slider and shifting the slider between a position guided by the fixed guide member and a position guided by the movable guide member, and a tool provided on the slider. A machine tool characterized in that the holder is moved forward and backward by the drive device between a tool attachment/detachment position that coincides with a sliding position of the main spindle and a position where the tool holder does not interfere with the main spindle.