JPH0226569Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" This invention relates to cutting tools for milling, such as face mills and end mills, that have throw-away tips, and in particular allows for quick, easy, and reliable attachment and detachment of throw-away tips. This invention relates to a cutting tool that enables cutting.

``Prior Art'' In general, the method of attaching a throw-away tip to a cutting tool body is to place each throw-away tip in a plurality of recesses formed in the tool body, and insert each throw-away tip through a wedge member. A method of tightening and fixing with bolts is used. However, each time you install or remove each throw-away tip, you must loosen and tighten the bolts, and it takes sufficient time and skill to tighten all the throw-away tips in their correct positions and with equal force. Moreover, the larger the number of throw-away tips, the more complicated the work of attaching and detaching them becomes.

To overcome these drawbacks, for example, Japanese Patent Publication No. 47-42587 has been proposed. This is configured to grip the throwaway chip by pressing the wedge member against the end face of the throwaway chip using the elastic force of the spring device.In the normal clamping state,
The throw-away tip is gripped by the elastic force of the spring device, and when the throw-away tip is removed, the wedge member is moved away from the end face of the throw-away tip against the elastic force of the spring device to create an unclamped state. It is becoming more and more like this.

``Problems to be Solved by the Invention'' By the way, in the cutting tool using the above-mentioned spring device, when attaching and detaching the throw-away tip, the wedge member is moved against the elastic force of the spring device so that the end face of the throw-away tip is Therefore, it has not been possible to completely eliminate the complexity of attaching and detaching the throw-away tip. In addition, in a configuration in which the throw-away chip is gripped by the elastic force of a spring device, the gripping force is determined by the characteristics of the spring, and it is difficult to obtain sufficient gripping force to continue gripping the throw-away chip during cutting. It also had the disadvantage that it was not possible to do so, and the configuration was complicated.

This idea was made in view of the above-mentioned circumstances, and is a cutting tool that has a simple structure and can quickly, easily, and reliably attach and detach the throw-away tip, and can also firmly grip the throw-away tip. is intended to provide.

"Means for solving the problem" This invention consists of a tool body having multiple recesses,
a plurality of throw-away chips arranged in each of the recesses; a contact surface formed in each of the recesses and to which one end surface of each of the throw-away chips abuts; is,
a gripping member that separates from each other end surface of the throwaway chip as it moves in the projecting direction and presses each other end surface of the throwaway chip as it moves in the recessed direction; The piezoelectric actuator is characterized by comprising a piezoelectric actuator that expands and contracts by itself when .

"Operation" By supplying or cutting off power to the piezoelectric actuator, the gripping member is displaced, resulting in a clamped state in which the throw-away chip is gripped, or an unclamped state in which the throw-away chip is not gripped.

"Embodiments" Hereinafter, embodiments of this invention will be described with reference to the drawings.

FIGS. 1, 2, and 3 are diagrams showing the structure of an embodiment of this invention. In these figures, the upper surface of 1 is attached to the main shaft of the machine tool,
The tool body 1 has a substantially cylindrical shape with its lower surface facing the workpiece, and a plurality of recesses 1a, 1a, . . . are formed in the peripheral edge of the lower surface of the tool body 1. Each recess 1a
A contact surface 1b with which one end surface of the throw-away tip 2 comes into contact is formed on each of the tips. Further, the tool body 1 has each recess 1a opened, and has a first guide hole 1c, a second guide hole 1d extending upward from the upper end of the first guide hole 1c, and a second guide hole 1d. Third guide holes 1e extending from the upper end to the upper surface of the tool body 1 are formed in the same number as the recesses 1a. In this case, the inner diameter of the second guide hole 1d is smaller than the inner diameter of the first and third guide holes 1c and 1e.

A substantially cylindrical gripping member 3 is provided in the first guide hole 1c.
is fitted in such a way that it can be protruded and retracted, and this gripping member 3
is connected to the lower end of the rod 4 which is inserted into the second guide hole 1d so as to be slidable in the vertical direction, and thereby supported so as to be movable in the vertical direction.

Here, the contact surface 1b is formed at a slight angle with respect to the moving direction (vertical direction) of the gripping member 3, and is a slope, so that the gripping member 3 is aligned with the first guide hole. As the gripping member 3 moves in the direction of protruding from the guide hole 1c (downward), it separates from the other end surface of the throwaway tip 2, and conversely, as the gripping member 3 moves in the direction of sinking into the guide hole 1c (upward). The other end surface of the throw-away tip 2 is pressed.

A third guide hole 1e is provided at the upper end of the rod 4.
An end plate 5 that is slidably fitted into the upper end opening is attached. Further, a cylindrical piezoelectric actuator 6 is housed in the third guide hole 1e, an end plate 5 is fixed to the upper end surface of the piezoelectric actuator 6, and a rod 4 is slidably passed through the hollow part. are doing.

The piezoelectric actuator 6 is an actuator that utilizes the property of piezoelectric ceramics to expand and contract when a voltage is applied to the piezoelectric ceramics. In this embodiment, the piezoelectric actuator 6 has a structure called a laminated type in which many thin plates of piezoelectric ceramics are laminated. A piezoelectric actuator 6 is used that has a structure that contracts in the longitudinal direction when a voltage is applied.

In the above configuration, no voltage is applied to the piezoelectric actuator 6 during normal use.
In this case, as shown in FIGS. 2 and 3, the gripping member 3 presses the end face of the throw-away tip 2 while being sunk into the guide hole 1c, thereby gripping the throw-away tip 2 and putting it in the clamped state. It is becoming.

Next, when removing the throw-away chip 2, as shown in FIG. 4, a power source B is connected to the piezoelectric actuator 6 and a voltage is applied. Then, the piezoelectric actuator 6 contracts and pulls down the end plate 5.
This is transmitted to the gripping member 3 via the rod 4, and the gripping member 3 moves downward. And the gripping member 3
is separated from the end face of the throw-away chip 2, and the throw-away chip 2 is in an unclamped state in which it is not gripped. This allows the throw-away tip 2 to be replaced.

In this way, by simply supplying or cutting off the power supply B to the piezoelectric actuator 6, the piezoelectric actuator 6 can be brought into a clamped state in which it grips the throw-away chip 2 or into an unclamped state in which it does not grip it. In this case, the gripping force by the piezoelectric actuator 6 is obtained based on the physical properties of piezoelectric ceramics, and is extremely large compared to conventional spring devices.According to recent reports, the generated stress is 350 kg/ ^cm2 layered piezoelectric actuator 6 has been developed and commercialized.

The present invention is not limited to the above-mentioned embodiment, but can also be applied to a structure in which the tool body 1 does not receive thrust force during cutting, as shown in FIG.

"Effects of the Invention" As explained above, according to the invention, there is provided a tool main body having a plurality of recesses, a plurality of throw-away tips respectively arranged in each of the recesses, and a plurality of throw-away tips formed in each of the recesses, a contact surface that each one end surface of the throw-away chip abuts, and a contact surface that is protrudingly and retractably provided in each of the recesses, and is separated from each other end surface of the throw-away chip as it moves in the projecting direction; a gripping member that presses each other end surface of the throw-away tip as it moves in the retracting direction; and a gripping member that expands and contracts by itself when a voltage is applied from the outside, causing each of the gripping members to protrude or retract. Since the piezoelectric actuator is provided with a piezoelectric actuator that displaces the throw-away tip, simply by supplying or cutting off power to the piezoelectric actuator, the gripping member can be displaced and put into a clamped state or an unclamped state in which the throwaway tip is gripped. ,
As a result, the throw-away tip can be quickly, easily, and reliably attached and detached with a simple configuration, and the throw-away tip can be gripped more firmly than when using a conventional spring device. Effects can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the structure of an embodiment of this invention, FIG. 2 is a partial front view showing the structure of the same embodiment,
Figure 3 is a partial sectional view showing the configuration of the same embodiment;
The figure is a partial sectional view for explaining the operation of the same embodiment, and FIG. 5 is a partial sectional view showing the configuration of another embodiment of the invention. DESCRIPTION OF SYMBOLS 1... Tool body, 1a... Recessed part, 1b... Contact surface, 2... Throwaway chip, 3... Gripping member, 4... Rod, 5... End plate, 6... Piezoelectric actuator.

Claims (1)

[Scope of utility model registration request] a tool body having a plurality of recesses; a plurality of throw-away tips disposed in each of the recesses;
A contact surface is formed in each of the recesses and abuts one end surface of the throw-away tip, and a contact surface is provided in each of the recesses so as to be able to protrude and retract. a gripping member that presses each other end surface of the throwaway chip as it moves away from each other end surface of the chip and moves in the sinking direction; A cutting tool comprising: a piezoelectric actuator that displaces each gripping member in a protruding or retracting direction.