JPS6377601A - Tool clamp device - Google Patents

Abstract

PURPOSE:To obtain a clamp device provided with high clamping force without tremor in clamping and is soft in such degree that the power supply line doesn't harm the accuracy by clamping with a spring and releasing this clamping by the use of piezoelectric element. CONSTITUTION:A rotation base 25 is clamped to a slide table with a rod 23, a plain washer and a nut through a spring 24. And direct current voltage is applied to a piezo 6 of laminated substance inserted into space between a plate fastened to the bottom face of the slide table 4 with a bolt and the end face of the rod 23 and the piezo 6 is extended and the rod is pushed up releasing the clamping force between the rotation base 15 and the slide table 4. In this way, the piezoelectric element 6, which is made by laminating piezoelectric ceramics in group of zirconic acid tatanic acid lead, extends and exhibits large force when it is applied with direct current voltage. Accordingly, a clamping device which enables high clamping force with small area without tremor in clamping and is soft in such degree that the power supply line doesn't harm accuracy in table motion can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a clamping device for a flat cutting tool, and more particularly to a tool clamping device having a mechanism suitable for automatically clamping without slight movement during clamping.

[Conventional technology]

The conventional device, as described in Japanese Utility Model Application Publication No. 60-94402, consists of means for adjusting the amount of rotation of the swivel table and means for checking the amount of rotation. However, the swivel base rotates a minute amount when tightening the bolts after the rotation adjustment, causing an error.
No consideration was given to automatic conclusion.

[Problem that the invention seeks to solve]

The above-mentioned conventional technology does not take into account the automation of the swivel clamp after adjusting the cutting edge angle of the flat cutting tool and the slight movement during screw tightening, and there is a problem in that the cutting device cannot be completely automated.

Hydraulic and pneumatic cylinders are known as automatic clamps, but pneumatic cylinders use a supply pressure of 5 to 6 Kf/cjG, so in order to obtain a clamping force of 4 f to 150, the inner diameter of the cylinder must be φ5 Qm or more. The disadvantage is that the clamp jig is thick (on the other hand, hydraulic cylinders can take a large supply pressure, so the inner diameter of the cylinder can be reduced, but the high pressure hose is hard, which deteriorates the movement accuracy of the moving table). There is.

The purpose of the present invention is to obtain a high clamp force in a small area,
To supply a clamping device that does not cause slight movement during clamping and whose power supply line is soft enough not to impair table movement accuracy.

[Means for solving problems]

The above purpose is for the clamping mechanism of the flat tool turret.
This is achieved by using a piezoelectric element as a means for clamping with a spring and releasing the clamp.

[Effect]

A piezoelectric element made by laminating lead zirconate titanate (PZT)-based piezoelectric ceramics expands when a DC voltage is applied. Utilizing this characteristic, it is possible to apply force only in the vertical direction to the fastening surface, making it possible to clamp with high precision.

However, piezoelectric elements have a small amount of displacement. For this reason, clamping is done by inserting a spring between the bolt and nut, and by pushing up this bolt with a piezoelectric element and releasing the clamp, the clamp can be released even if the displacement of the piezoelectric element is about 1 μm. .

〔Example〕

An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 shows the appearance of a cutter cutting part of a processing machine that uses a flat cutting tool. A flat cutting tool 2 is arranged so that the cutting edge faces the workpiece 1. The 1,000-piece cutting tool 2 is bolted to a rotating base 5 via a cutting tool holder 3. The swing base 15 is mounted on a slide base 4 and can swing around a pivot 5, and the amount of swing is determined by a screw fixed to a spring plunger 11, a spur gear 12m, and a rotating shaft of a motor 13. It is provided by a swing drive section consisting of a spur gear 12b. After the rotation is adjusted by the rotation drive section, the rotation base 15 is fixed onto the slide table 4 via the piezo clamp sections 6a and 6b. Thereafter, the guide base 7 cuts into the workpiece 1, and the slide table 4, which is slidably guided so as to be retractable, is rotated by the motor 10 and the flat tool 2 is inserted into the workpiece 1 through the feed screw 9. Cut a predetermined amount,
This is a tool clamp device that moves a moving base 8 and cuts a workpiece 1 with a flat cutting tool 2.

FIG. 2 shows the cross-sectional color of the piezo clamp section 6 shown in FIG. 1.

The rod part, flat washer n, and nut A 21 are connected via the spring 24.
Then, the swing base 15 is clamped to the slide table 4, and the clamp is released by applying a DC voltage to the piezo 6 of the laminated body inserted between the plate 5 bolted to the bottom of the slide table 4 and the end face of the rod part. applying a voltage and stretching the piezo;
Push up the rod and release the clamping force between the swing base 15 and the slide base 4.

Modification Example 1 A modification example of the piezo clamp section shown in FIG. 2 is shown in FIG. Instead of arranging the piezo 6 inside the slide table 4 of FIG. 2, the piezo 6 is placed outside via an L-shaped fixing table 26.

Modification 2 The clamp shown in Fig. 2 is released when a DC voltage is applied to the piezoelectric element, but the clamping method shown in Fig. 4 directly connects the piezoelectric element with the rod n, nut 21, and flat washer 22. 6, and the clamp is released by voltage OV.

Modification 3 Although the clamping in FIG. 2 was performed using the spring 24, a method of clamping by using a thin rod portion as the rod portion as shown in FIG. 5 and utilizing the elastic deformation of this portion.

Modification Example 4 The tool clamping device shown in FIG. 1 rotates the flat cutting tool 2 on the slide table 4, but in FIG. A method of rotating the flat cutting tool 2 by rotating the guide base 7 that slides and guides it.

〔Effect of the invention〕

According to the present invention, the turning part of the cutting tool can be fixed within 10 seconds at the 'vt degree after rotational positioning by a fastening method using a piezoelectric element, and furthermore, it has the effect of being automated.

[Brief explanation of the drawing]

FIG. 1 is an external view of one embodiment of the present invention, FIG. 2 is a sectional view of the clamp part, FIGS. 3, 4, and 5 are sectional views showing modified examples of the clamp part, and FIG. 6 2 is an external view showing a modification of FIG. 1. FIG. l...Workpiece 2...Flat bite 3...
Bit holder 4...Slide base 5...Pivot 6a, 6b...Piezo clamp 7...Guide base 8...Movement base 9...
・Feed screw 10...Motor 11...Spring plunger 12a, 12b...Spur gear 13...Motor 14
...Dial indicator 15...Swivel base 21...Natsuto person n.
・・Flat washer n・Rod Sae・Spring
5...Plate 26...L-shaped fixed stand agent Patent attorney Masaru Ogawa Repeat offense 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. In a processing machine having a tool angle adjustment means, the tool rotation table is rotated around a pivot axis between the tool rotation table and a fixed base that fixes the tool rotation table. After adjusting the tool rotation table with the adjustment means, the tool rotation table is fastened to the fixed base. A tool clamping device that clamps a fastening bolt and a nut via a spring, and releases the clamp by pushing up the fastening bolt with a piezoelectric element.