JPH05228759A - Machine tool - Google Patents

Abstract

PURPOSE:To provide a machine tool where the mechanism is simplified and the cost is reduced without using a so-called pallet exchanging device to exchange pallets in an alternating manner, and at the same time, which reduce the non-cutting time as much as possible between the time when the actual cutting of the subsequent work is started and the time when machining of one work is completed, and where automation is easily introduced. CONSTITUTION:Two work table rotary shafts 41, 42 are provided on a preparatory station 14, and work tables 21, 22 are supported on the work table rotary shafts 41, 42 in a rotatable manner respectively. The respective work tables 21, 22 are swayable between retreat position on the preparatory station 14 and an advancing position on a fixed table around the work table rotary shafts 41, 42. The work table rotary shafts 41, 42 are arranged so as to be in the same position when two work tables 21, 22 come to the retreat position respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a machine tool, and more particularly to a machine tool for machining a work fixed on a work table such as a machining center while the tool is moving.

[0002]

2. Description of the Related Art Conventionally, in various machine tools such as machining centers and drilling centers, various machine tools equipped with pallets and pallet exchanging devices have been proposed and put into practical use in order to improve work replacement efficiency. (For example, Jitsuko Sho 60-29400). These machine tools are equipped with a plurality of pallets, a pallet that is placed in the machining area of the machine tool and has a machined workpiece, and a pallet that is placed outside the machining area and has a workpiece to be machined next. By exchanging the work, the work setup time and the machining cutting time are made to overlap with each other to increase the actual cutting time.

[0003]

However, the machine tool provided with the pallet exchanging device as described above requires a considerable time for the alternating pallet exchanging operation regardless of the manual type and the automatic type, and the pallet exchanging device operates. There is a problem that the actual cutting time is reduced because the machine tool cannot perform cutting work. Further, in order to solve the above-mentioned problems, an apparatus capable of alternately machining respective works by two pallets supported in parallel (Japanese Patent Laid-Open No. 59-201).
No. 732) has been proposed, but there are two setup positions, and when automating with a robot etc., either two robots are required or one robot must be operated by two programs. There was a problem.

The present invention has been made in order to solve the above-mentioned problems and does not use a so-called pallet exchange device for alternately exchanging pallets, but simplifies the mechanism to reduce the cost, and one work piece. It is an object of the present invention to provide a machine tool that shortens the non-cutting time from the end of the machining of 1 to the start of the actual cutting of the next work as much as possible and that is easy to automate.

[0005]

In order to achieve this object, a machine tool of the present invention is equipped with a spindle head, a column movable in a predetermined range, and a machining area on a fixed table facing the column. It is swingably supported between an advancing position located inside and a retracted position out of the machining area,
Further, it is provided with two work tables which can be held at the same position when in the retracted position.

[0006]

In the machine tool of the present invention having the above-mentioned structure, one work table is fixed in the machining area, and while the mounted work is being machined, the work replacement work is completed. By rotating the work table of, and arranging it side by side on the work table being machined and fixing it in the machining area, it is possible to move from one work table to machining of the other work table only with the time to move the column. it can. The other work table, which has been machined while one work table is being machined, is retracted to the outside of the machining area, the work is replaced, and the work table is fixed again within the machining area as the next work table. It is possible to continue machining alternately without stopping the axis movement, and there is no downtime of the machine due to replacement of the work or work table. Therefore, the ratio of the actual cutting time can be improved. Further, since the retracted positions of the respective work tables are the same, there is only one replacement setup position for the work, and it is easy to automate the work supply and the like.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of a machine tool embodying the present invention, and FIG. 2 is a side view.

A column base 2 is provided on a base 1 slidably in a lateral direction (X-axis direction), and a column 3 is slidably mounted on the column base 2 in a front-rear direction (Y-axis direction). The spindle heads 4 are mounted slidably in the vertical direction (Z-axis direction). The column base 2 is an X-axis motor 5,
The column 3 is a Y-axis motor 6 and the spindle head 4 is a Z-axis motor 7.
Are configured to be driven and fed by the respective.
The spindle head 4 is provided with a spindle 9 which is driven to rotate by a spindle motor 8, and an ATC device 11 which is driven by an ATC motor 10 is mounted.

The fixed table portion 13 in front of the base 1 has two
The two work tables 21 and 22 can be mounted side by side in the lateral direction (X-axis direction). The spindle 9 is movable on a fixed table 13 in which two work tables 21 and 22 are arranged side by side, and the fixed table 13 forms a machining area of a machine tool. In front of the fixed table 13, the setup station 1
4 is fixed and attached to the base 1. Two work table rotary shafts 41, 42 are provided on the setup station 14.
The work tables 21 and 22 are rotatably supported by the work table rotating shafts 41 and 42, respectively. The work tables 21 and 22 are arranged around the work table rotating shafts 41 and 42, respectively, and are arranged in the setup station 14.
It is swingable between an upper retracted position and an advancing position on the fixed table 13. Work table rotating shafts 41 and 42 are 2
The two work tables 21 and 22 are arranged so as to be in the same position when they come to the retracted positions.

Further, slide covers 26 and 27 are provided at the rear of the column 3 so as to be openable and closable in the X-axis direction.

The operation will be described based on the above configuration. 3 to 8 are schematic plan views for explaining the operation.

First, as shown in FIG. 3, a work table 21 is placed on the setup station 14, and a work table 22 is placed on the fixed table 13. In this state, the setup work for attaching the work 31 to the work table 21 is performed. Next, when the attachment of the work 31 is completed, as shown in FIG. 4, the work table 21 is sent onto the fixed table 13 and fixed by a clamp device (not shown). At the same time, the right slide cover 27 is opened, the work table 22 is sent out from the fixed table 13 onto the setup station 14, and fixed by a clamp device (not shown). Left slide cover 26, right slide cover 2
By closing 7 and exciting the machine, the machine begins to machine the work 31 on the work table 21. The next work 32 is attached to the work table 22 during this processing. When the attachment of the work 32 is completed, as shown in FIG.
The right slide cover 27 is opened and the work table 22 is sent out onto the fixed table 13 and fixed by a clamp device (not shown). During this time, the machine continues to process the work 31 on the work table 21. Then, the right slide cover 27 is closed, and the processing of the work 31 on the work table 21 is awaited.

When the processing of the work 31 on the work table 21 is completed, the column 3 moves to the right as shown in FIG. 6, and subsequently the work 32 on the work table 22 is started to be processed. During this processing, the left slide cover 26 is opened, the clamp device is loosened, and the work table 21 is pulled out to above the setup station 14.
Close. Then, the processed work 31 is removed,
Replace with the next work 33. When the attachment of the next work 33 to the work table 21 is completed, the left slide cover 26 is opened as shown in FIG.
1 is sent to the fixed table 13 and fixed by a clamp device. Then, the left slide cover 26 is closed and the processing of the work 32 on the work table 22 is awaited.

When the machining of the work 32 on the work table 22 is completed, the column 3 moves to the left as shown in FIG. 8, and subsequently the machining of the work 33 on the work table 21 is started. While the machine is processing the work 33 on the work table 21, the right slide cover 27 is opened, the clamp device is loosened, the work table 22 is pulled out onto the setup station 14, the right slide cover 27 is closed, and the processed work is finished. 32 is replaced with the next work 34. Then, the right slide cover 27 is opened, and as shown in FIG. 5 again, the work table 22 is fed onto the fixed table 13, fixed by the clamp device and the right slide cover 27 is closed, and the completion of processing of the work table 21 is waited. Hereinafter, by repeating the above-described operation, the machine replaces the work 32 of the other work table 22 while processing the work 31 of the one work table 21 and continuously performs the cutting work without stopping the machine. it can.

Since this embodiment only needs to have a mechanism for swinging the work table back and forth and a mechanism for clamping the work table at its forward and backward positions, it is complicated as in the case of the conventional pallet exchanging device for alternating pallets. There is an advantage that a simple mechanism can be constructed at low cost without requiring a complicated mechanism. Further, since the two work tables have the same retracted position and only one set-up position is provided, there is also an advantage that automation is easy.

The work tables 21 and 22 may be moved and clamped manually or by using an actuator such as a motor or an air cylinder.

[0018]

As is apparent from the above description, the machine tool of the present invention is equipped with a spindle head, is movable in a predetermined range, and a machining area on a fixed table facing the column. The pallet is equipped with two worktables that are swingably supported between a forward movement position located at the rear position and a retreat position deviated from the processing area, and that can be held at the same position when in the retracted position. Instead of using a so-called pallet exchanging device that exchanges alternately, the mechanism is simplified and cost is reduced, and the non-cutting time from the completion of machining of one work to the start of actual cutting of the next work is shortened as much as possible. Further, since the setup locations of the two work tables are the same, it is possible to provide a machine tool that is easy to automate.

[Brief description of drawings]

FIG. 1 is a perspective view of a machine tool embodying the present invention.

FIG. 2 is a side view of a machine tool embodying the present invention.

FIG. 3 is a schematic plan view illustrating a work exchange operation.

FIG. 4 is a schematic plan view illustrating a work exchanging operation.

FIG. 5 is a schematic plan view illustrating a work exchange operation.

FIG. 6 is a schematic plan view illustrating a work exchange operation.

FIG. 7 is a schematic plan view illustrating a work exchanging operation.

FIG. 8 is a schematic plan view illustrating a work exchange operation.

[Explanation of symbols]

 3 Column 4 Spindle head 13 Fixed table 14 Setup station 21 Work table 22 Work table 31 Work 32 work

Claims (1)

[Claims] 1. A column, on which a spindle head is mounted, which is movable within a predetermined range, and between a forward position and a retracted position, which are located in a machining area on a fixed table facing the column and are out of the machining area. A machine tool comprising: two work tables that are swingably supported and that can be held at the same position when in a retracted position.