JPS63134146A - Tool changer - Google Patents

Abstract

PURPOSE:To aim at the shortening of tool changing time, by installing both first and second tool changers between a tool rest and a magazine, and attaching this second tool changer onto a carriage, capable of shifting and positioning in a X-axis by numerical control, together with a ready station of a changing carrier. CONSTITUTION:When a tool change command is issued, a tool rest 5 is moved in both Z-and X-directions, and positioned to a tool change position, while it turns a turret so that a changed tool is turned and indexed to the change position. Next, a twin arm 24 of a second tool changer 23 holds the next tool of a turnover pot 18 and the changed tool of the tool rest 5 and it is extended in a turning shaft direction of the arm 24, pulling the tool, and it turns over and swivels. And a shaft of the arm 24 is contracted, and the changed tool is inserted into the turnover pot 18 of the carrier 15 and the turret of the tool rest 5, thus a tool change is over. Thus, the tool can be changed by shortening the time at an optional position within the moving range in the Z-axial direction of the tool rest 5.

Description

[Detailed description of the invention] Industrial applications The present invention relates to an automatic tool changer for an NC lathe.

Conventional technology In recent lathe operations, the machining details have become more complex.
More and more machines are being equipped with machining center (MC)-like functions. Regarding ATC using a taper shank tool that can handle this MC-like machining, Japanese Patent Application Laid-Open No. 60
- As in No. 56840, a second tool changer equipped with twin arms is provided near the tool magazine, and this second tool changer is used to change the tool at the tool mounting position of the tool rest using the pot of the ready-stitching machine. Ta.

Problems to be Solved by the Invention Conventionally, the tool change arm was fixedly installed near the magazine, so each time a tool was changed, the tool rest had to be reciprocated to the tool change position near the magazine, resulting in an additional tool change time. was there.

Means for solving the problem A plurality of bore doors for storing taper shank tools for machining centers are connected endlessly to the side end of the psychological table 4 of the bed 1, arranged so that the tool axis is parallel to the Z axis, and replaced. In an NC lathe having a tool magazine 6 that can be indexed to a certain position, a tool rest 5 that can removably mount a plurality of tools with taper shanks, and that can be rotated and indexed, the head 1
A carriage 12 placed on a first rail 8 provided parallel to the upper Z-axis and movable and positionable according to the position of the tool post 5; and a carriage 12 provided parallel to the first rail 8 on the carriage 12. The tools placed on the second rail 13 and positioned at the tool exchange positions A1 and B are placed on the headstock 2 side and the tool magazine 6 side 180.

an exchange carrier 15 having a reversible pot 18; and a tool magazine for exchanging tools between the pot 7 in the indexed C position of the tool magazine 6 and the pot 18 in the tool exchange B position of the exchange carrier 15; A first tool exchanger π25 provided near the tool exchanger 6 and a second tool exchanger π25 provided on the carriage 12 for exchanging the tools of the tool rest 5 and the tools of the pot 18 located at the tool exchange A position of the carriage 12.
A tool change station 23 is provided.

Example Embodiments of the present invention will be described below based on the drawings.

On the head of a known NC lathe, there is a chuck 3 on the headstock 2.
The main shaft fitted with the
A psychological table 4 is provided for the patient.

A tool post 5 is positioned on the upper guide surface of the bed 1 in the Z-axis and X-axis directions and is controlled by an NC. The tool rest 5 is of a cleft type and can be rotated and indexed around a horizontal rotation axis, and a plurality of tools are mounted with the tool axes horizontally.

A known tool magazine 6 used in NC is attached to the end surface of the bed 1 on the psychological table 4 side. That is, a plurality of pots 7 into which taper shank tools are mounted are connected endlessly with their shafts horizontally, and the tools are indexed and positioned at tool exchange positions by numbering them or by numbering them. Further, a first rail 8 that is horizontal in the Z-axis direction is fixedly installed above the bed 1, and a ball screw 1 (l is provided so that it can only rotate) is rotated by a motor 9 that is controlled by an NC in parallel with the first rail 8. A carriage 12 having a napft 11 screwed onto a pole screw 10 is placed on the first rail 8 and can be moved and positioned.

Two second rails 13 parallel to the first rail 8 are provided on the upper front side of the carriage 12.
An exchange carrier 15, which serves as a ready station for the MC, is positioned on the tool exchanger 3, and is moved to the tool exchange positions A and B2 by a piston rod 17 of a fluid pressure cylinder 16 provided parallel to the second rail 13. . Then, the exchange carrier 15 has an inversion pot 1 with its axis horizontal.
8 is provided, and the reversing pot 18 is a fluid pressure rotating cylinder 19 around a pivot axis provided in the X-axis direction at right angles to the axis.
It is rotated and indexed by 180 degrees so that the taper hole faces the headstock 2 side and the tool magazine 6 side.

A dog 20 is provided at the upper end of the rotating shaft of the rotating cylinder 19, and is configured to be inverted together with the pot 19 so that a signal is emitted by proximity switches 21 and 22 for index confirmation. Furthermore, the reversing pot 18 is also provided with a hydraulically driven tool clamping mechanism (not shown).

Further, a second tool changer 23 is installed below the front side of the carriage 12.
is provided with the pivot axis horizontal and the twin arms 24 facing the headstock 2 side. The twin arm 24 has two grippers at its tips that can be opened and closed, and can be rotated at a rotation angle of 1806 by a hydraulically driven cylinder for inserting and extracting a known tool (not shown) and a double cylinder for rotation, which are provided parallel to the rotation axis.
It is possible to index the exchange position and the standby position of about 90'' and expand and contract in the tool axis direction to position the tool in the 2nd and 1st positions for extracting and pushing in the tool. A first tool changing device 25 is provided corresponding to the tool changing position C on the side of the tool magazine 6, and the changing arm holds one gripper that is opened and closed. The gripper arm 26 at the tip is positioned at three positions to expand and contract in the axial direction by a hydraulic double cylinder (not shown), and a hydraulic pressure (not shown) is applied to an arm shaft 27 perpendicular to the gripper arm 26 so that the gripped tool can be extracted and inserted. The gripper arm 26 is positioned at two positions, the tool extraction position and the insertion position, by movement by the cylinder. There are three positions of the magazine: the indexed C position and the standby position, and the tool in one pot is moved to the other pot.

Operation When the tool number of the rotary tool for tertiary machining is specified in the above-described configuration, the carriage 12 is positioned at the tool exchange position on the magazine side, the exchange carrier 15 is positioned at the exchange position 8 position 1, and the reversing pot 18 is positioned at the magazine 6 side. It is confirmed whether the direction is towards the sky or not. On the other hand, the magazine 6 rotates and the specified tool number is indexed to the exchange C position. Then, the gripper arm 26 of the first tool changer 25 is extended from the standby position, and the gripper is moved to the C position.
When the position indexing tool is gripped, the arm shaft 27 moves in the direction of the tool axis, the tool is pulled out, and the Grisova 5 arm 26 further extends and the tool is attached to the empty reversal bond 18 of the exchange carrier 15 at the exchange 8 position. The gripper arm 26 is retracted to the standby position, and the reversing pot 18 is reversed 1800 degrees to the headstock 2.
The exchange carrier 15 turns to the side and moves to the exchange A position and stands by. When a preliminary tool exchange command is issued near the end of the turning process, the carriage 12 moves on the first rail 8 toward the headstock 2 and is positioned at a predetermined tool exchange position.

When the turning process is completed and a tool change command is issued, the tool rest 5 moves in the Z-axis and X-axis directions and is positioned at the designated tool change position at the shortest distance that avoids interference with the workpiece. The tool post 5 rotates the turret and the tool to be replaced is rotated and indexed to the replacement position. The twin arm 24 of the second tool changer 23 rotates from the standby position, and the grippers at both ends grip the next tool of the change carrier I5 (reverse pof) 18 and the replaced tool of the tool post 5, and move in the direction of the arm rotation axis. It extends and pulls out the tool, and the twin arm 24 reverses and rotates. Then, the arm rotation axis is reduced and the replaced tool is inserted into the reversing pot of the replacement carrier 15 and the turret attachment part of the tool post 5, and the twin arm 24 is turned and returned to the waiting position m+M. The carriage 12 runs on the first rail 8 and moves to the magazine 6 side, and the exchange carrier 15 runs on the second rail 13 and moves to the exchange 8 position, and the reversing pot 1 is reversed and moves the magazine 6 side to the same side. Ku.

On the other hand, the tool rest 5 rotates the turret to place the tool at the machining position, and is moved in the X-axis and Z-axis directions to be positioned at the cutting position. On the other hand, the gripper arm 2 of the first tool changer 25
6 extends and the gripper grips the tool on the exchange carrier 15, the arm axis moves and pulls out the tool, the gripper arm 26 contracts and is located at the exchange position C of the magazine 6, and the arm axis 27 moves in the opposite direction. Then, the tool is inserted into the empty pot 7, and the gripper arm 13 returns to the standby position. The exchange carrier 15 waits at position 8 until the next tool is commanded and selected.

Effects As detailed above, the present invention provides the first tool changer and the second tool changer provided between the tool rest and the magazine.
Since the second tool changer is mounted on the carriage ridge, which can be moved and positioned in the Z-axis direction by NC control, together with the ready station silan of the change carrier, tools can be changed at any position within the Z-axis movement range of the tool rest. This has the effect of shortening tool exchange time and shortening non-cutting time.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a lathe with a tool changer according to the present invention, FIG. 2 is a side view of the lathe with a magazine removed, and FIG. 3 is an explanatory view of tool change. l...Bed 4...Tailstock 5...Turret 6...Tool magazine 7...Pot 8...First rail 12...Carriage 13...Second rail l5...Replacement carrier'' 18...Reversal Bot 23...Second tool changer 25...First tool changer

Claims (1)

[Claims] (1) Multiple pots for storing taper shank tools for machining centers are connected endlessly to the tailstock side end of the bed, arranged so that the tool axes are parallel to the z-axis, and can be indexed to the replacement position. In an NC lathe that has a tool magazine, a plurality of taper shank tools removably mounted thereon, and a turret that can be rotated and indexed,
a carriage placed on a first rail provided parallel to the axis and movable and positionable according to the position of the tool rest; and a second rail placed on the carriage parallel to the first rail. An exchange carrier having a pot positioned at the tool exchange A position and B position and capable of reversing the tool by 180 degrees to the headstock side and the tool magazine side, and a pot at the indexed C position of the tool magazine and the exchange carrier. A first tool changer provided near the tool magazine for exchanging tools between a pot located at a tool exchange B position, a tool of the tool rest provided on the carriage, and a pot of the carriage located at a tool exchange A position. A tool changing device comprising a second tool changing device for exchanging tools in the pot.