JPH0220370B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a machine tool equipped with a tool changing device.

The purpose of the present invention is to make it possible to replace only the special tools required for each workpiece in a tool magazine at once, thereby shortening the time required for tool replacement when changing workpieces and reducing the number of tools. This means eliminating waste.

In a machine tool equipped with a tool magazine, the tools stored in the tool magazine include tools commonly used for various workpieces and tools used exclusively for the workpiece to be machined. Ru. Therefore, it is necessary to replace the dedicated tool as the type of workpiece to be machined changes.

Conventionally, there are tools that respond to changes in the workpiece being machined by replacing the entire magazine, but with this model, even tools that can be commonly used for machining various types of workpieces are It was necessary to prepare a large number of common tools in a magazine, which resulted in the waste of stocking a large number of common tools and required a lot of time for setup changes due to magazine exchange, which had a negative impact on workpiece processing efficiency.

The present invention has solved the above-mentioned conventional problems, and its feature is that, in addition to commonly used tools, a dedicated tool area is formed in the tool magazine to store special tools that require replacement. To provide a machine tool equipped with a tool changing device that extracts tools from a dedicated tool area all at once and stores required tools all at once.

Embodiments of the present invention will be described below based on the drawings.
In FIG. 1, reference numeral 1 indicates a base of a machine tool, and reference numeral 2 indicates a slide table that is moved on the base 1 by a servo motor, and has a pallet 3 on which a workpiece W is placed on its upper surface. 4 is a column of a machine tool that moves forward and backward on the base 1 toward the workpiece W on the slide table 2; It then moves up and down. 7 is a spindle supported by the spindle head 5, and 10 is a chain-type tool magazine. A tool exchange arm 8 is installed between the tool magazine 10 and the spindle 7 via a rotating body 9, and is used to exchange tools between the tool magazine 10 and the spindle 7 at the tool exchange position P. .

The present invention provides a standard tool area in which the tool magazine 10 is commonly used for various workpieces W;
Special tool area 11 required for the workpiece W to be machined
Divide and form. And this tool magazine 1
A tool changing device for extracting and inserting tools into the dedicated tool area 11 is disposed on the side opposite to the dedicated tool area 11. This tool changing device may be a stationary type or a portable type as shown in the figure. In the case of a portable type, as shown in FIG. the rail 15
A tool changing device is installed on the transport vehicle 12 that is self-propelled above. In the tool stocker 16, special tools that can be replaced all at once in the special tool area 11 of the tool magazine 10 are stored separately as A, B, etc. for various workpieces, and are moved to predetermined positions by the indexing motor 17. It is becoming more and more widely available. 13 is a motor for driving the transport vehicle 12; 18 is a stopper for stopping the transport vehicle 12 at the position of the tool magazine 10;
9 is a stopper that stops at the position of the tool stocker 16.

In addition, a tool magazine 10 and a tool stocker 16
A chain 20 rotating endlessly is provided with a tool socket 21, and each tool socket 21 is provided with a spring 23 for preventing a tool 22 inserted into the tool socket 21 from coming off.

The configuration of the tool changing device installed on the carrier vehicle 12 will be described below.

A pilot bar 30 extending in an axial direction parallel to the axes of tools stored in the tool magazine 10 and the tool stocker 16 is provided on the carrier 12, and a movable base 29 is provided which is guided by the pilot bar 30 and moves forward and backward. 38 is a cylinder for moving the movable base 29 forward and backward. On the movable base 29 is a tool holder 1 that is movable in the vertical direction (hereinafter referred to as the vertical direction) perpendicular to the tool axis and can be rotated around an axis parallel to this direction (hereinafter referred to as horizontal rotation).
4 is provided. The drive mechanism for vertically and horizontally rotating the tool holder 14 has a pivot shaft 31 rotatably supported on the movable table 29, and a pinion 32 formed on the pivot shaft 31. In addition, a rack shaft 33 that engages with the pinion 32 is slidably provided on the movable base 29, and a piston rod 3 of a rotating cylinder (not shown) is provided.
4 through a connecting member 35. Furthermore, a cylinder 41 in the vertical axis direction is provided within the pivot shaft 31, a piston 36 and a piston rod 37 integral with the piston 36 are provided within the cylinder 41,
The piston rod 37 is made to protrude from the upper end of the pivot shaft 31, and its protruding end is connected to the tool holder 14. The piston 36 is engaged with the pivot shaft 31 in the rotational direction so as to rotate integrally with the pivot shaft 31.

The tool holder 14 includes a tool holder 27 that engages and holds a plurality of tools 22 in parallel in a horizontal state.
a and 27b are provided at opposite positions with the rotation axis interposed therebetween. These tool holding members 27a, 27b
is provided with a plurality of tool engaging recesses 24 and gripping claws 25 that grip the tool 22 that is engaged and held in the tool engaging recesses 24. 26 is each gripping claw 2
5 is a spring that presses the tool in the gripping direction. Therefore, when the tool 22 moves into and out of the tool engagement recess 24, the gripping claw 25 swings against the pressing force of the spring 26 to allow the tool 22 to move in and out.

Reference numeral 28 denotes a locking plate that engages with a groove 42 formed in the tool socket 21 to prevent the tool socket 21 from being displaced, and is fixed to the transport vehicle 12. 39 is a pump unit, and 40 is a hydraulic control circuit.

Next, the operation of the present invention will be explained starting from the time when machining of the previous workpiece is completed.

The transport vehicle 12 is moving toward the tool stocker 16, and the tool stocker 16 indexes and positions a special tool required for the next workpiece W at a predetermined position. On the other hand, the tool magazine 10 indexes the dedicated tool area 11 to the tool exchange position.

The movable platform 29 on the carrier 12 that is moving toward the tool stocker 16 moves forward toward the tool stocker 16, and the tool holding member 27a facing toward the tool stocker 16 stops directly below the dedicated tool at the indexing position. . Thereafter, the tool holder 14 is raised by the operation of the cylinder 41, the tool engaging recess 24 of the tool holder 27a engages with the tool 22, and the tool 22 is gripped by the gripping claws 25. Next, the movable base 29 is moved backward to remove the tool 2.
2 is pulled out from the tool socket 21 and held in the tool holding member 27a. At the end of the backward movement of the movable table 29, the pivot shaft 31 is activated to rotate the tool holder 14 by 180 degrees and lower the tool holder 14. Then, the transport vehicle 12 self-propels toward the machine tool 4 side, and the tool magazine 10
Stop at a position facing the At this time, transport vehicle 1
The locking plate 28 fixed to the tool socket 2 engages with the groove 42 of the tool socket 21 of the dedicated tool area 11 indexed to the tool change position, and the tool socket 2
1. Regulates the back and forth rocking of 1. Further, the tool holding member 27a facing the tool magazine 10 side is in an empty state in which no tools are held.

In this state, first, the previously used tool 22 from the dedicated tool area 11 of the tool magazine 10 is removed. That is, in the same way as when removing a tool from the tool stocker 16, the movable base 29 is advanced, the magazine holder 14 is raised, and the movable base 29 is moved backward. Now the used tool 2 in dedicated tool area 11
2 is extracted and held by the tool holding member 27b. Next, the tool holder 14 is rotated 180 degrees with the tool holder 14 in the raised state. As a result, the tool holding member 27a holding the tool 22 extracted from the tool stocker 16 is directed toward the tool magazine 10 side. Then, the movable base 14 moves forward again,
The tool 22 held by the tool holding member 27a is inserted into the tool socket 21 of the dedicated tool area 11. Thereafter, the tool holder 14 moves downward, and the tool 22 inserted into the tool socket 21 of the dedicated tool area 11 is released from the tool holder 27a, and the tool holder 14 moves backward. Now tool magazine 10
The tool change to dedicated tool area 11 has been completed,
The transport vehicle 12 moves toward the tool stocker 16 to return the removed tool 22 to the tool stocker 16.
The tool holder 14 on the carrier 12 located on the tool stocker 16 side rotates 180 degrees, and the removed tool 2
The tool holding member 27b holding the tool 2 is directed toward the tool stocker 16, the tool holder 14 is raised, the movable base 29 is moved forward, and the tool is inserted into the tool socket 21 of the empty tool stocker 16. By moving the tool holder 14 downward, the return of the extraction tool to the tool stocker 16 is completed.

If the operator prepares the next tool on the tool holding member, the tool can be replaced by a stationary tool changer instead of the conveyor vehicle 12.

As described above, according to the present invention, when replacing a special tool when a workpiece is changed, the tool magazine is divided into a standard tool area and a special tool area that are used in common for various workpieces, and the dedicated tool area is Since only the tools in the magazine can be replaced at once using the tool changer, the tool replacement work can be completed in a short time, improving the efficiency of pressurizing work, and the entire magazine can be replaced. This has the advantage that there is no need to prepare standard tools for each magazine, which saves money.

[Brief explanation of drawings]

FIG. 1 is a side view of the present invention, FIG. 2 is a plan view of the tool changer, FIG. 3 is a sectional view taken along the line of FIG. 2, and FIG. 4 is a sectional view taken along the line of FIG. 3. 1...Base, 2...Slide table, 4...
... Column, 5 ... Spindle head, 8 ... Tool exchange arm, 10 ... Tool magazine, 11 ... Special tool area, 14 ... Tool holder, 20 ... Chain,
21...Tool socket, 22...Tool, 24...
Tool engaging recess, 25...gripping claws, 27a, 27b
. . . Tool holding member, 29 . . . Movable base, 30 . . . Pilot bar, 31 .

Claims (1)

[Claims] 1 In addition to tools that are commonly used for various workpieces, a special tool area is formed in the tool magazine of the machine tool to store tools that need to be replaced and is dedicated only to the workpiece to be machined. a movable base that is disposed on the side opposite to the dedicated tool area and capable of moving forward and backward in a direction parallel to the tool axis of the dedicated tool area; and a tool holder that is movable in a direction perpendicular to the tool axis and pivotable around an axis parallel to this direction, and the tool holder has a tool holder at a position opposite to the tool holder with the rotation axis in between. An engaging grip portion is provided for holding a plurality of tools at the same pitch as the arrangement pitch of the tools in the tool area, and further, by moving the movable base and tool holder, the plurality of tools can be held in the dedicated tool area. A machine tool equipped with a tool changing device that is provided with a drive mechanism that simultaneously transfers the tool between the tool holder and the tool holder.