JP2005088183A - Tool holder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that machine tools such as large-sized NC machine tools, machining centers require more machining time as compared with machine tools such as small-sized NC machine tools, machining centers in the case wherein a machining spindle repeats a linear motion to make a part a large number of machining works on a workpiece because the size and the weight of spindles are large compared with those of the machine tools such as the small-sized NC machine tools, the machining centers, and a motor power to drive has a large output so that the linear acceleration/deceleration time constant of the machining spindle becomes large. <P>SOLUTION: A tool holder mounted in a main spindle of the machine tool such as the NC machine tool, the machining center integrates an actuator that moves linearly and whose acceleration/deceleration time constant is small and a spindle that moves rotatively so that the travel time of a machining tool is shortened by driving the integrated actuator for making the fine machining works. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a tool holder used in a machine tool such as an NC machine tool or a machining center, and relates to a tool holder having a drive mechanism inside the tool holder.

As shown in FIG. 3, a conventional tool holder is used by directly attaching a machining tool to a tool holder and setting it on a spindle of a machine tool such as an NC machine tool or a machining center (for example, Non-Patent Document 1). reference). In addition, when a rotation different from the spindle of a machine tool such as an NC machine tool or a machining center is required, as shown in FIG. 4, a spindle that is rotated by electric or air drive is arranged inside the tool holder, Some have a transmission (see, for example, Non-Patent Document 2).
“Kuroda Seiko Co., Ltd. Touring Catalog No. KT127-C” P37, February 2000 “Daise Showa Seiki Co., Ltd. General Catalog Vol.3 Touring No. 130-3-0202-2” P187, P188, February 2002

  In recent years, manufacturing apparatuses and molds for semiconductors and the like have a tendency to increase in size, and parts used in these apparatuses are also increasing. Along with this, machine tools such as NC machine tools and machining centers for machining parts tend to increase in size. On the other hand, parts used in manufacturing apparatuses such as semiconductors and dies, regardless of the size, have many parts that require fine processing, and it is necessary to perform many fine processing even for large machine tools. . However, the size and weight of each movable part is larger in the large machine tool than the small machine tool, and the output of the electric motor that drives the movable part is also large. Therefore, the linear acceleration / deceleration time constant T2 with respect to the rapid feed speed S of the large machine tool shown in FIG. 6 is larger than the linear acceleration / deceleration time constant T1 with respect to the rapid feed speed S of the small machine tool shown in FIG. When machining by moving the same distance, there is a problem that machining with a large machine tool requires more time than machining with a small machine tool.

  The present invention incorporates a multi-axis drive mechanism including a linearly moving actuator having a small acceleration / deceleration time constant and a rotating spindle within a tool holder used in a machine tool such as an NC machine tool or a machining center. It is characterized by.

  The invention according to claim 2 makes it possible to use an automatic tool changer when attaching / detaching the tool holder of the present invention to / from a spindle of a machine tool such as an NC machine tool or a machining center. The positioning mechanism is arranged. In this positioning mechanism portion, a connection port for supplying a working force for driving the mechanism built in the tool holder of the present invention and a connector for communicating a signal for controlling the built-in mechanism are arranged. .

  According to a third aspect of the present invention, a collet and a chuck capable of easily exchanging the processing tool are arranged at the tip of the tool holder. Further, a seal is disposed to discharge the coolant and cutting fluid through the inside of the tool holder of the present invention and prevent the coolant, cutting fluid and cutting waste from entering the inside of the tool holder of the present invention.

  In the tool holder of the present invention, a machining tool is attached to the tip of a spindle that performs rotational movement, and the spindle that performs rotational movement is driven by an actuator that performs linear movement with a small acceleration / deceleration time constant. Therefore, when performing fine machining with linear motion, the actuator that moves linearly inside the tool holder moves at a high speed, so the moving speed of the machining tool is faster than machining while driving the spindle of a large machine tool directly. Is fast. As a result, the processing time can be shortened.

  According to the second aspect of the present invention, the tool holder of the present invention can be easily attached to a machine tool such as an NC machine tool or a machining center using an automatic tool changer, and work loss due to tool holder replacement is minimized. Can be. Furthermore, the driving force and control signal for the spindle and actuator can be transmitted via a connector provided on the tool holder. Also, it can be operated by receiving drive force and control signals directly from the machine tool controller, when the machine tool controller and the tool controller operate while communicating, or when operated independently by the tool controller. Control.

  According to the third aspect of the present invention, the processing tool can be easily replaced in a short time. Moreover, the periphery of the spindle of the machine tool can be made compact by directly discharging coolant or cutting fluid from the tool holder of the present invention. Furthermore, a seal is disposed at a portion where the spindle moves linearly, preventing coolant, cutting fluid, cutting waste and the like from entering the inside of the tool holder of the present invention, and improving the durability of the tool holder.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

First embodiment

  FIG. 1 shows a sectional view of a tool holder incorporating a spindle and a linear actuator.

  The spindle 1 is fixed to the spindle holder 2 and linearly moves in the vertical direction in the figure by the linear actuator 3 using the guide 4 as a guide. A machining tool 7 held by a collet 5 and a nut 6 is attached to the tip of the spindle 1. The driving force and control signal of the spindle 1 and the linear actuator 3 are connected to the positioning connector 10 of the tool holder A through the driving of the spindle and the signal cable 9 and the driving and signal cable 8 of the linear actuator. It operates by the driving force and control signal supplied from the controller D. Further, coolant or cutting fluid is supplied from the discharge port 15 via the inside of the tool holder A. The seal 12 is arranged so that coolant, cutting fluid, and cutting waste do not enter the inside of the tool holder A.

  FIG. 2 shows a front view of the machine tool and the tool holder of the present invention.

  The tool holder A of the present invention is attached to the spindle 13 of the machine tool B by an automatic tool changer C of the machine tool B. When the tool holder A is attached to the spindle 13 of the machine tool B, the tool holder A is positioned in the X, Y, and Z directions by the taper shank 11 and the rotation direction is determined by the positioning connector 10. When the connection between the positioning connector 10 of the tool holder A and the connector 14 of the machine tool B is completed, the controller E of the machine tool B and the controller D of the tool holder A start communication. Thereafter, the spindle 13 of the machine tool B moves to a predetermined machining position, the spindle 1 of the tool holder A rotates, and machining is performed while the linear actuator 3 moves in the vertical direction in the figure.

Second embodiment

  FIG. 7 shows a cross-sectional view of a tool holder with a built-in spindle and servo motor.

  The spindle 1 is fixed to the spindle holder 2a and linearly moves in the vertical direction in the figure with the guide 4 as a guide by a ball screw 18 coupled by a servo motor 16 and a coupling 17. A machining tool 7 held by a collet 5 and a nut 6 is attached to the tip of the spindle 1. The driving force and control signal of the spindle 1 and the servo motor 16 are connected to the positioning connector 10 of the tool holder F through the driving of the spindle and the signal cable 9 and the driving and signal cable 19 of the servo motor, and the tool installed outside. It operates by the driving force and control signal supplied from the controller D. Further, coolant or cutting fluid is supplied from the discharge port 15 via the inside of the tool holder F. The seal 12 is arranged so that coolant, cutting fluid, and cutting waste do not enter the inside of the tool holder F.

  It is the figure of 1st Example which showed the tool holder sectional drawing and controller of this invention.   It is the front view which showed the reduced view of the tool holder of this invention, and the machine tool.   It is the front view which showed the conventional tool holder.   It is the front view which showed the tool holder which incorporated the spindle which performs the conventional rotational motion.   It is the graph which showed the acceleration / deceleration operation | movement of the main axis | shaft of a small machine tool.   It is the graph which showed the acceleration / deceleration operation | movement of the spindle of a large sized machine tool.   It is the figure of 2nd Example which showed the tool holder sectional drawing and controller of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Spindle 2 Spindle holder 2a Spindle holder 3 Linear actuator 4 Guide 5 Collet 6 Nut 7 Machining tool 8 Linear actuator drive and signal cable 9 Spindle drive and signal cable 10 Positioning connector 11 Taper shank 12 Seal 13 Machine tool spindle 14 Machine tool Connector of machine 15 Discharge port 16 Servo motor 17 Coupling 18 Ball screw 19 Servo motor drive and signal cable A Tool holder B Machine tool C Automatic tool changer D Tool holder controller E Machine tool controller F Tool holder S Rapid feed rate T1 Linear acceleration / deceleration time constant for small machine tools T2 Linear acceleration / deceleration time constant for large machine tools

Claims (3)

A tool holder for use in machine tools such as NC machine tools and machining centers. A tool holder that incorporates a multi-axis motion mechanism including an actuator that performs linear motion and a spindle that performs rotational motion inside the tool holder. It can be attached to and detached from machine tools such as NC machine tools and machining centers manually or with an automatic tool changer. It has a tool holder positioning, drive force supply and control signal connection mechanism. The tool holder according to claim 1, wherein the tool holder operates on either a signal, a signal by communication between a controller of the machine tool and the tool controller, or a signal of the tool controller alone. It has a chuck function that allows easy replacement of the machining tool, and discharges coolant and cutting fluid to the machining part via the inside of the tool holder, while coolant and cutting fluid and debris generated during cutting are contained inside the tool. The tool holder according to claim 1, further comprising a seal that prevents entry.

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