JPS6176251A - Vibro-isolating shaft member - Google Patents

Abstract

PURPOSE:To secure such an effective vibro-isolating shaft member as having no directability, by coupling core materials divided into plural core material constituent pieces on a plane surface along axis via a viscous material set up between cut surfaces, while inserting the coupled one into the inner part of a pipe material shell body. CONSTITUTION:To assemble a shaft part 3, four core material constituent pieces 13 are coupled together by a viscous material 7 and unitized in one, thus a core material is formed. And, a viscous material 6 is applied to the outer circumferential surface, while the core material 12 is inserted into a shell body 11 with an adhesive applied to an inner surface of the shell body 11 as a wet active material and with solidification of the adhesive, the core material is inserted into the shell body via the viscous material. And, when a work is machined by a boring tool using this vibro-isolating material, such exciting force as producing chattering vibration against the boring tool acts on there but this vibration makes all viscous materials produce a large strain by action of the core material installed inside the tool in order to improve vibration damping capacity. With this constitution, energy is absorbed and vibrations in the boring tool is prevented from occurring.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a vibration-isolating shaft member used for vibration-isolating tools, rotating shafts, and the like.

Traditional technology A shaft member with a relatively long shaft part that supports the base side and applies an excitation force to the tip side, such as a shaft member of a boring tool or a grinding wheel arm, has a length and a diameter. It is necessary to construct it in a long shape with a large ratio, and as a result, chatter vibration occurs during machining, reducing machining accuracy, and depending on the machining conditions, machining may become difficult.

Various proposals have been made to resolve the above difficulties, but
I can't find any simple and effective means of vibration isolation.
Furthermore, vibration isolation without directionality could not be easily achieved.

Problems to be Solved by the Invention The present invention provides a vibration-isolating shaft member that effectively performs vibration isolation of a shaft member using simple means, and also easily realizes non-directional vibration isolation. This is what we are trying to propose.

Means for Solving the Problems In order to achieve the above object, the vibration isolating shaft member of the present invention is a shaft member that supports the base side and suppresses the vibration of the shaft portion on which the excitation force is applied to the distal end side. The shaft portion is constructed by inserting a core material into the inside of a shell made of a tube material through a viscous material for vibration absorption, and the core material is formed by inserting a core material into a plurality of core materials in a plane along its axis. It is constructed by dividing it into constituent pieces and joining these constituent pieces via a viscous material placed between the cut surfaces.

Functions and Effects When an excitation force is applied to the tip of the anti-vibration shaft member having the structure E, the space between the shell in the shaft and the core inserted into the shell, and the core Large strains occur in the viscous material between the core components, absorbing vibration energy and achieving effective vibration isolation.

EXAMPLES Below, examples of the present invention will be described in detail with reference to the drawings.

1 and 2 show an embodiment in which the present invention is applied to a boring tool, which is composed of a mounting base l, a blade part 2, and a shaft part 3 connecting them.

The shaft part 3, which has one end fixed to the mounting base 1, has a shell body 11 made of a tube material made of a material with high rigidity, and a viscous material 6 made of acrylic resin or the like for absorbing vibrations inside the shell body 11. A substantially cylindrical core material 12 is inserted and fixed through the shell body 11, and the core material 12 is made of a highly rigid material similar to the shell body 11. The core material is divided into four core component pieces 13, and these component pieces 13 are joined together into a cylindrical shape using the same viscous material 7 as described above disposed between the cut surfaces.

Further, at the tip of the shaft 7 part 3, the shell body 11 is formed longer than the core material 12, and the blade part attachment hole 14 is formed at the end of the shaft part 3.
The cutting edge 1 of the blade portion 2 is formed in the mounting hole 14.
7 support members 1B are fitted and fixed.

The mounting base 1, the blade 2, and the core 12 can be opposed to each other by interposing the same viscous material as described above between them, if necessary, without fixedly connecting them.

Various types of viscous materials having desired viscosity can be used as each viscous material, and the core material 12 does not necessarily need to be divided into four equal parts, but if it is divided into two equal parts, it is necessary to Therefore, in order to perform vibration isolation without directionality, it is necessary to divide the beam into at least three equal parts.

- Various methods can be used to assemble the shaft 3 in the lower part, but for example, four core components 1
3 are combined and integrated with a viscous material 7 to form a core material 12, a viscous material 6 is applied to the outer peripheral surface of the core material 12, and an adhesive applied to the inner surface of the shell body 11 is used as a lubricant to attach the core material 12 to the shell. It is also possible to adopt a method in which the core material is inserted into the shell 11, and when the adhesive hardens, the core material is inserted into the shell through a viscous material.

When a workpiece is cut using a boring tool configured as described above, an excitation force that causes chatter vibration is applied to the boring tool. The action of the core material absorbs energy by creating large strains in the active material of each part, thereby preventing vibrations of the boring tool.

FIG. 3 shows a shank cross section when applied to a square shank used for turning or the like.

In this case, the overall structure of the tool will be similar to that shown in FIG. Therefore, the same reference numerals are given to the same or corresponding parts as in the embodiment described above, and the explanation thereof will be omitted.

4 to 7 are diagrams showing the results of experiments conducted to confirm the effects of the present invention.

In these experimental examples, a conventional tool having an integral shaft portion was used as tool 1, and tools with shell wall thicknesses of 1.5 mm and 1.0 mm in the embodiment of the present invention were used as tools 2 and 1. It was set as tool 3. Figures 4 to 7 show measurements of the vibration damping state of tools 1 to 3 when an external shock is applied to them.
In FIGS. 5 and 6), the vibrations disappear significantly more quickly than in the conventional tool I (FIG. 4).

In addition, FIG. 7 shows the stable range in which chatter vibration does not occur and the unstable range in which chatter vibration occurs under various machining conditions using tools 1 to 3.
From this figure, it can be seen that the tools 2 and 3 of the present invention are more stable at high cutting speeds than the conventional tool 1 at the same feed rate, and among the tools 2 and 3 of the present invention, the wall thickness of the shell It can be seen that the thinner tool 3 is more stable.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view of an embodiment of the present invention, and FIG. 2 is an A-
3 is a sectional view taken along line A, FIG. 3 is a sectional view taken at the same position as FIG. 2 in another embodiment, and FIGS. be. 2.Blade part, 3ψ・Shaft part, 6.7.Pseudoviscous material, 11..Shell body, 12φφ core material, 13.. Core material component piece.

Claims (1)

[Claims] 1. A shaft member that supports the base side and suppresses the vibration of the shaft portion on which an excitation force is applied to the distal end side, the shaft portion comprising:
It is constructed by inserting a core material into the inside of a shell made of a tube material through a viscous material for vibration absorption, and the core material is divided into a plurality of core material component pieces on a plane along the axis of the core material. A shaft member for vibration isolation, characterized in that the pieces are connected via a viscous material disposed between the cut surfaces.