JP2006272514A - Main spindle twist locking device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a main spindle twist locking device which can firmly lock twist of a main spindle without causing problems in terms of accuracy or without complicating the structure of the device to lock the main spindle. <P>SOLUTION: According to the structure of the main spindle twist locking device, a plate spring is mounted in a gap between a tool holder and a main spindle head fixing flange, and the plate spring is deflected using a tool holder mounting force by a draw bar 12, followed by press-contacting the plate spring 29 to the tool holder and the fixed flange, to thereby lock the twist of the main spindle by a friction force. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a spindle rotation fixing device for a complex machine tool that performs spindle rotation cutting and turning while fixing the spindle.

  There are two types of machine tools: a method of machining a workpiece by rotating a spindle with a cutter, and a method of machining by rotating a workpiece while fixing the cutter, each having a corresponding machine tool. In recent years, complex machine tools have been developed to perform these processes with a single machine tool.

  The compound machine tool includes a rotating spindle and a system for fixing the spindle for turning, and can control the continuous rotation or rotational position of the workpiece.

  FIG. 1 shows a complex machine tool. A main shaft 1 is incorporated in a main shaft head 2, and the main shaft head 2 rotates on a saddle 3 and is controlled in an arbitrary direction. The saddle 3 moves on the column 4 and the column 4 moves on the column base 5. The column base 5 moves on the bed 6 and the workpiece 7 is controlled to be continuously rotated and arbitrarily rotated. FIG. 1 shows a state in which a turning tool holder 8 and a blade 9 are provided on the spindle 1.

  When the workpiece 7 is rotated by turning the workpiece 7 in FIG. 1, the force shown by the arrow acts and the force that rotates the spindle 1 works, so that a spindle rotation fixing device is necessary to prevent this.

  FIG. 2 shows a main shaft structure of a compound machine tool. The main shaft 1 is supported by a bearing 14 and is rotated through a gear 11 by a motor 10. The motor 10 has a built-in brake so that the rotation of the main shaft can be positioned at a fixed position. The tool holder 8 is fixed to the main shaft 1 with a spring force by a draw bar 12 and is released by a cylinder piston 13. During turning, a strong rotational force acts on the spindle 1 and it is difficult to fix it at a fixed position only with a motor brake.

  In FIG. 3, the rotation is fixed by inserting the protrusion of the tool holder into the groove of the stopper 15 of the main body. However, this method complicates the shape of the tool holder, and causes a problem in accuracy due to the gap between the protrusion 16 of the tool holder and the groove of the stopper 15.

  FIG. 4 shows a state in which the brake head 17 for fixing the spindle rotation to the spindle head 2 is shown. The ring 18 provided on the spindle is sandwiched by the brake unit 17 to fix the rotation. The force for fixing the lens tends to be insufficient, and the structure becomes complicated.

  The problem to be solved is that the structure becomes complicated in order to fix the rotation of the main shaft strongly and without any problem in accuracy.

As shown in FIG. 5, the present invention is characterized by comprising a disc holder 20 and a tool holder 21 having a groove for press-contacting the disc spring to fix the rotation of the main shaft 1.

  In the spindle rotation fixing device of the present invention, the disc spring 20 is deflected by the force of the draw bar 12 for fixing the tool holder 21 to the spindle, and a strong force is generated to press the tool holder 21 and the fixing flange 19 so as to increase accuracy. There is an advantage that the problem does not occur.

  Since the disc spring 20 is mounted between the tool holder 21 and the fixing flange 19 and the rotation is fixed by the force of the draw bar, a powerful spindle rotation fixing device is realized with a simple structure.

  FIG. 6 shows a state in which the disc spring 20 is compressed by the notch of the tool holder 21 and the inner and outer diameters are increased and pressed against the fixing flange 19 and the tool holder 21 when the tool holder 21 is pulled in and fixed by the draw bar 12. Yes.

  FIG. 7 shows a disc spring mounted, and a necessary rotational fixing force can be obtained by changing the inner diameter and thickness.

  FIG. 8 shows a structure in which a disc spring is integrated with a fixed flange, so that the number of parts can be reduced and the structure can be simplified.

  As a means for adjusting the rotation fixing force, FIG. 9 shows an example in which a groove is provided in the disc spring, and FIG. 10 shows an example in which a part of the disc spring is used.

  FIG. 11 shows an example equipped with a tool holder 22 for rotary cutting. Since the outer diameter of the standard tool holder is smaller than the inner diameter of the disc spring 20, it can rotate without contacting the disc spring.

  FIG. 12 shows a structure in which a disc spring is attached to the tool holder 25. In this case, the structure on the spindle head 2 side can be simplified.

Overview of compound machine tool Spindle structure diagram of compound machine tool Spindle rotation fixing method with stopper Spindle rotation fixing method with ring Spindle rotation fixing method with disc spring Main shaft structure when main shaft rotation is fixed by a disc spring Belleville spring diagram Fixed collar integrated disc spring diagram Slotted disc spring diagram Partial disc spring shape Rotating cutting holder installation drawing Wearing holder with disc spring

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Spindle 2 Spindle head 3 Saddle 4 Column 5 Column base 6 Bed 7 Work piece 8 Turning tool holder 9 Cutting tool 10 Motor 11 Gear 12 Draw bar 13 Cylinder piston 14 Bearing 15 Stopper 16 Projection part 17 Brake unit 18 Ring 19 Fixation Flange 20 Belleville spring 21 Grooved tool holder 22 Rotary cutting tool holder 23 Belleville spring receiving flange 24 Belleville spring retainer 25 Belleville spring holder

Claims (1)

In a compound machine tool, a disc spring is installed between the tool holder and the spindle head body as a means to fix the rotation of the spindle to perform turning with the rotating spindle. A spindle rotation fixing device for a composite machine tool, wherein the inner diameter is pressed against the tool holder, the outer diameter is pressed against the head body, and the rotation of the spindle is fixed by the frictional force thereof.

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