JPH08252715A - Planer cutting tool - Google Patents

Abstract

PURPOSE: To provide a planer cutting tool of high dynamic rigidity by positively damping vibration. CONSTITUTION: A slitting 1a is provided on the part relatively most largely vibrating in a cutting edge holder main body 1 holding a cutting edge 5 on the extreme end and fixed to a cutting edge holder fitting base 6, friction plates 2, 3 are stuck on the slitting 1a so as to constitute a friction damping element, and hence the dynamic rigidity is improved.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to planar bytes. Specifically, the blade holder main body of the planar is improved in dynamic rigidity.

[0002]

2. Description of the Related Art FIG. 3 shows an example of a planer for mainly planing a workpiece using various cutting tools. As shown in the figure, a steel blade holder main body 01 is attached to the blade holder mounting base 06.
A cutting tip (cutting tool) 05 is held at the tip of 1.
The shape of the cutting tool holder body 01 has a shape in which the cutting point is lowered rearward with respect to the mounting portion so as to escape under a cutting load in order to avoid biting during cutting.

[0003]

In the above-mentioned conventional planar bite, when the cutting load is large, the force applied to the tool and its vibration become large, so that the machine tool and the tool vibrate and the cutting can be continued. Disappear. It is a phenomenon commonly known as chattering. Especially, due to the restriction of the shape to be processed,
When the blade holder main body 01 is extended for a long time, the vibration of the holder itself becomes significant.

Further, if the cutting tool holder body 01 is enlarged to the full extent of the size constraint, there is a problem that the rigidity cannot be further improved. The present invention has been made in view of the above prior art, and an object thereof is to provide a planar bite having high dynamic rigidity by positively damping vibration.

[0005]

According to the structure of the planar bite of the present invention that achieves the above object, a friction damping element is added to a cutting tool holder main body which is held at a tip thereof and fixed to a cutting tool holder mounting base. It is characterized by improving the dynamic rigidity. In addition, the friction damping element is provided in a portion of the cutting tool holder body that vibrates relatively largest, and further, a cut is made in the cutting tool holder body, and a friction plate is attached to the cut. And

[0006]

When the cutting tool held at the tip of the cutting tool holder body is used for processing such as cutting, the reaction force causes vibration of the cutting tool holder body. The friction damping element provided in the cutting tool holder body consumes a work amount corresponding to the frictional force and the amplitude as energy loss, so that a vibration damping effect is produced. Here, the vibration of a small object such as the cutting tool holder main body generally has a high frequency of several hundreds Hz to several thousands Hz, so that a large damping effect appears.

In particular, if a cut is made in a portion of the cutting tool holder body that vibrates relatively most, that is, a node of vibration, and a friction plate is attached to the cut to form a friction damping element, it is efficient. Since energy is consumed, the damping effect can be further increased. Incidentally, although static rigidity is lowered by making a cut, since the friction plate is attached, it is possible to compensate for the lowered degree and further increase dynamic rigidity.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments shown in the drawings. 1 and 2 show an embodiment of the present invention. As shown in the figure, a steel blade holder main body 1 is attached to a blade holder mounting base 6, and a cutting tip (blade) 5 is held at the tip of the blade holder main body 1.

The shape of the cutting tool holder main body 1 is such that the cutting point is lowered backward with respect to the mounting portion so as to escape by the cutting load in order to avoid biting during cutting. A U-shaped cut 1a is formed in the central portion of the cutting tool holder body 1 on the opposite side of the cutting tip 5. This position is a position at which the blade holder main body 1 relatively vibrates most, that is, a vibration node.

A recess is formed on the front and back of the upper and lower parts of the cut 1a, and a through hole is formed in this recess. Friction plates 2 and 3 are fitted vertically in the recesses on the front and back of the cut 1a, and the friction plates 2 and 3 on the front and back are tightened from both sides with countersunk bolts 4 passing through the through holes. The friction plates 2 and 3 are made slightly smaller than the recesses.
Not only two friction plates 2 and 3 but also grooves in the body,
It is also possible to provide a larger number. Further, it is not necessary to provide a plurality of pieces, and one piece may be provided.

If space allows, instead of the flat head bolt 4,
Ordinary bolts may be used, riveting,
It is also possible to use welding or the like. In short, the friction plates 2 and 3 may be sandwiched. Further, the through hole is made slightly larger so that it does not interfere with the countersunk bolt 4.

In the planar cutting tool of the present embodiment having the above-mentioned structure, since the friction plates 2 and 3 are provided on the cutting tool holder body 1 as the friction damping elements, the vibration caused by cutting affects the friction force of the friction plates 2 and 3 and its amplitude. Depending on the work done, it is consumed as an energy loss. Therefore, a vibration damping effect occurs, and it is possible to perform machining under efficient cutting conditions.

Here, since vibration of a small object such as the cutting tool holder body 1 is generally a high frequency of several hundred Hz to several thousands Hz, a large damping effect appears. In particular, since the U-shaped notch 1a is provided and the friction plates 2 and 3 are attached to the most vibrating portion of the tool holder body 1, the notch 1
Since the vibration around the node a is consumed as energy loss, the damping effect can be further increased.
By making the cut 1a, the cutting tool holder body 1
However, since the friction plates 2 and 3 are attached, the degree of the decrease can be compensated and the dynamic rigidity can be further increased.

[0014]

As described above in detail with reference to the embodiments, according to the present invention, since the cutting tool holder body is provided with the friction damping element, it is possible to damp vibration due to cutting and to improve dynamic rigidity. It has become higher, and it has become possible to perform machining under efficient cutting conditions. In particular, when the friction damping element is provided in the portion that vibrates most in the tool holder body, the vibration is effectively damped.

[Brief description of drawings]

FIG. 1 is a front view of a planar bite according to an embodiment of the present invention.

FIG. 2 is a right side view of a planar bite according to an embodiment of the present invention.

FIG. 3 is a conceptual diagram of a conventional planar byte.

[Explanation of symbols]

 1 Cutting tool holder body 2, 3 Friction plate 4 Countersunk bolt 5 Cutting tip (cutting tool)

Claims (3)

[Claims] 1. A planer bite characterized in that a dynamic damping is enhanced by adding a friction damping element to a cutting tool holder main body which holds a cutting tool at its tip and is fixed to a cutting tool holder mounting base. 2. The planar cutting tool according to claim 1, wherein the friction damping element is provided in a portion of the cutting tool holder body that vibrates relatively largest. 3. The planar cutting tool according to claim 1, wherein the friction damping element is formed by making a cut in the cutting tool holder body and attaching a friction plate to the cut.