JPH09234639A - Vibration control material for cutting cylindrical material to be cut - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively prevent chattering vibration so as to improve dimension accuracy after machining by composing a vibration control material for preventing a chattering vibration produced during machining of a cylindrical material of a hollow elastic cylindrical body having holes uniformly formed on a full outer surface and fitting this in the cylinder of the cylindrical material. SOLUTION: As a machining vibration control material for the cylindrical machined material of a metal drum such as aluminum, a hollow elastic cylindrical body having a shape holding ability is used and holes are uniformly formed on the full outer surface of this cylindrical body. Then, the cylindrical material is machined by inserting and fitting this hollow elastic cylindrical body in the cylinder of the cylindrical material. For the hollow elastic cylindrical body, one compose of an elastic body used as a vibration preventing material generally, for instance natural rubber. Other than holes, continuous recessed and projecting portions may be formed on the outer surface of the machining vibration control material and preferably the area of the recessed parts of the continuous recessed and projecting portions is set within the range of 5 to 7% of the area of the outer surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antivibration material that effectively prevents chatter vibrations that occur when an outer surface of a cylindrical material to be cut by a lathe is cut or both ends are machined.

[0002]

2. Description of the Related Art Conventionally, a horizontal cylindrical turning machine has been used to cut a cylindrical material to be cut, for example, a cylindrical substrate for an electrophotographic photosensitive member. Generally, a lathe has a headstock for imparting rotation to the material to be cut and a tailstock for supporting the other end of the material to be opposed to this, and further a reciprocating motion for attaching a bite and giving feed. There is a table (turret) on it.
Working conditions such as the angle of each part of the cutting tool, cutting speed, and feed when using a turning tool to cut the material to be cut include the chip generation mechanism, cutting resistance, cutting temperature, tool life, cutting surface roughness, It affects chatter vibration. The chatter vibration generated during cutting includes forced chatter vibration and self-excited chatter vibration. Possible causes of the chattering vibration are unbalance of the rotor and vibration due to the structure of the lathe. However, the rigidity of the lathe is increasing, and the chattering vibration is not so large except in special cases.

On the other hand, it is considered that the cause of the self-excited chattering vibration is due to the fluctuation of the cutting resistance and the vibration characteristics of the lathe, the cutting tool and the material to be cut. As one of the preventive measures against this, it is effective to adopt an appropriate vibration-proof material.
As a vibration-proof material, generally, as a material with high vibration-proof effect,
Examples thereof include those made of rubber such as natural rubber, butadiene rubber, EP rubber, acrylic rubber, and urethane rubber, and the structure thereof includes foamed rubber having closed cells or open cells. Also, the overall shape is
When a preformed cylindrical material or a sheet-shaped material is inserted into a material to be cut, a material wound in a cylindrical shape along the inner surface of the material to be cut is usually used. Since such a vibration damping material is considered to have its vibration damping effect when the vibration damping material is brought into close contact with the inner surface of the material to be cut,
Conventionally, a vibration damping material having a certain weight or more is used, and the vibration damping material is brought into close contact with the inner surface of the tubular material to be cut by centrifugal force. However, when the tubular work material is thinned, the vibration-damping material itself adversely affects the dimensional accuracy (roundness, cylindricity, straightness, runout, etc.) of the tubular work material after cutting. The use of vibration damping material with a large mass was not preferable. For this reason, when cutting a thin-walled material to be cut, it was very difficult to satisfy dimensional accuracy and chatter vibration prevention.

[0004]

DISCLOSURE OF THE INVENTION An object of the present invention is to have a high effect of preventing chatter vibration when cutting a tubular work material, particularly a thin tubular work material having a thickness of 5 mm or less, and after cutting. The present invention provides a vibration-proof material suitable for producing a tubular work material having excellent dimensional accuracy.

[0005]

Means for Solving the Problems As a result of intensive studies for achieving the above-mentioned object, the present inventors have found that a vibration-proof material having a hole in the surface in contact with the inner surface of a cylindrical work material is very effective. The present invention has been completed and the present invention has been completed. That is, the gist of the invention is that it is composed of a hollow elastic tubular body having a shape-retaining property, is fitted into the tubular material of the tubular material to be cut, and has holes uniformly distributed over the entire outer surface thereof. It exists in the vibration-proof material for cutting the material to be cut.

Hereinafter, the present invention will be described in detail. As the cylindrical material to be cut in the present invention, a metal drum of aluminum or the like, for example, an aluminum drum having a thickness of about 5 mm to 0.5 mm known for electrophotographic photoreceptors can be used. As a vibration isolator for cutting a cylindrical work material, a hole formed of a hollow elastic tubular body having shape retention, fitted in the cylinder of the tubular work material, and uniformly distributed over the entire outer surface. Is to have.

This hollow elastic tubular body is hollow elastic when it is inserted, fitted and mounted in the cylinder of the tubular work material, or at least when the work material is rotated for cutting. It is necessary to maintain a constant shape so that the outer surface of the tubular body contacts the inner surface of the tubular material to be cut, and the thickness of the tubular portion is usually 0.5 mm to 10 mm, preferably 1 mm. ~ 8 mm
It is a degree.

The outer diameter of the tubular portion of the hollow elastic tubular body may be the same as the inner diameter of the tubular work material, or may be slightly smaller or slightly larger. As long as it can be smoothly inserted and fitted in the cylinder of the cutting material, can be closely attached to the inner surface of the tubular work material during cutting, and can be smoothly detached from the inner surface of the tubular work material after cutting. Good.

Even when the outer diameter of the tubular portion of the hollow elastic tubular body is slightly smaller than the inner diameter of the tubular work material, the tubular work material having the hollow elastic tubular body mounted inside the tubular work material Is rotated about its axis, most of the outer surface of the hollow elastic tubular body comes into contact with the inner surface of the tubular work material. One end of the hollow elastic tubular body may be closed, and the closed portion may be in a flat plate shape, or may be a shape having a bulge or a convex portion on the outside or inside of the hollow elastic tubular body.

The hollow elastic tubular body in the present invention may be made of an elastic body generally used as a vibration isolator such as natural rubber, butadiene rubber, EP rubber, acrylic rubber, urethane rubber and the like. .

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The holes provided on the outer surface of a hollow elastic tubular body must be present as uniformly as possible in the circumferential direction and axial direction of the hollow elastic tubular body. The hole usually has a diameter of 1 mm to 3 mm, and the depth thereof is usually 5 mm to 10 mm and usually penetrates the hollow elastic tubular body, although it depends on the thickness of the tubular portion of the hollow elastic tubular body. . Usually, the distance between the holes is preferably about 10 mm to 20 mm. From the point of view of breathability due to the provision of holes, for example, 1 ×
10 ⁻⁷ to 1 × 10 ⁻¹⁰ m ³ , especially 1 × 10 ⁻⁸ to 1 × 10
^-9 m ³ is desirable. Also, on the outer surface of the hollow elastic tubular body,
In addition to the holes, continuous uneven patterns of various shapes may be provided. In this case, the recesses which the outer surface of the hollow elastic tubular body has and which are not in contact with the inner surface of the tubular work material and are distributed over the entire surface are preferably continuous rather than independent, and partially or partially unrecessed. Although it may be made uniform, it is preferable that the hollow elastic cylindrical body is present as uniformly as possible in the circumferential direction and the axial direction of the outer surface, and each of the recesses and the spacing between the recesses is a hollow elastic cylindrical body. It is preferable that they are substantially the same in the circumferential direction or the axial direction. It is usually preferred that such recesses consist of a circumferential groove and an axial groove. Here, the circumferential groove need not necessarily be parallel to the circumference, and the axial groove need not necessarily be in the same direction as the shaft.

The width of the groove, which is a recess, is usually 0.5 m.
It is about m to 5 mm, and its depth is usually 0.2 mm to 5 m, though it depends on the thickness of the tubular portion of the hollow elastic tubular body.
The distance between the grooves is preferably about 1 mm to 50 mm. As the cross-sectional shape of the groove which is the concave portion, various shapes such as a U-shape, a V-shape, and a square U-shape can be used.

The ratio of the area of the concave portion to the area of the outer surface of the cylindrical portion of the hollow elastic cylindrical body fitted in the cylinder of the material to be cut is 5 to 75%, preferably 10 to 65.
%, More preferably 15 to 55%. Here, the area of the recessed portion is the area of the portion of the outer surface of the tubular portion of the hollow elastic tubular body that fits into the cylinder of the workpiece and does not contact the workpiece. FIG. 1 is an explanatory view of a part of a hollow elastic tubular body that is an example of the present invention developed on a plane, a is a plane explanatory view, and b is a PP line cross-sectional explanatory view.

[0014]

EXAMPLES The present invention will be described in more detail with reference to examples below, but the present invention is not limited to the following examples as long as the gist thereof is not exceeded.

[Example 1] An outer diameter of 8 as a cylindrical material to be cut
Ultra precision lathe SPA manufactured by Shoun Kosakusho using an aluminum pipe of 0.5 mm, wall thickness 1.25 mm, and length 348 mm.
5 is used for cutting, outer diameter 80.0 mm, wall thickness 1.0 m
An aluminum pipe having a length of m and a length of 348 mm was made. The cutting conditions at this time are as follows.

[0016]

[Table 1] Rotation speed 5000 rpm Roughing bar tool Compax bite Feed 0.50 mm Cutting 0.23 mm Finishing bit Tokyo Diamond Tool Manufacturing Miracle Bit feeding 0.25 mm Cutting 0.02 mm Cutting oil Kerosene mist Anti-vibration material A vibration-damping material that is a hollow elastic tubular body in which holes are provided at intersections of V-shaped grooves that intersect at right angles. Specifically, a hollow elastic tubular body made of foam rubber (natural rubber) having a groove width of 2 mm, a depth of 0.5 mm, a groove-to-groove spacing of 6 mm, and a thickness of 5 mm.

[Example 2] As a vibration-damping material, a hollow elastic tubular body made of foamed rubber having a diameter of 1 mm per 10 mm square and having a thickness of 5 mm and having no concave and convex pattern on the surface was used. Except that the outer diameter is 80.
An aluminum pipe having a thickness of 0 mm, a thickness of 1.0 mm and a length of 348 mm was made.

[Comparative Example 1] An aluminum pipe was produced in the same manner as in Example 1, except that the same vibration isolating material as in Example 1 was used except that no holes were provided. [Comparative Example 2] An aluminum pipe was produced in exactly the same manner as in Example 1, except that the same hollow elastic tubular body made of foamed rubber as in Example 2 was used except that no holes were provided as the vibration isolator. Table 1 shows the occurrence of chattering in the above operation.

[0019]

[Table 2] Table 1

From these results, the vibration damping material for cutting a tubular work material of the present invention, which can be manufactured by a simple method of forming holes, shows a remarkable effect in preventing chatter vibration during cutting. It is understood that this facilitates the production of a thin-walled tubular work material with good dimensional accuracy.

[0021]

INDUSTRIAL APPLICABILITY The vibration damping material for cutting a tubular work material obtained according to the present invention has a high effect of preventing chatter vibration when cutting the tubular work material, and has a high dimensional accuracy after cutting. It is a vibration-proof material for cutting, which is suitable for producing an excellent tubular cutting material, and is very useful particularly in cutting a thin-walled cylindrical cutting material.

[Brief description of drawings]

FIG. 1 is an explanatory view of a vibration damping material for cutting according to an embodiment of the present invention, a is a plan explanatory view in a state of being developed on a plane, and b is PP.
FIG.

[Explanation of symbols]

 F Axial direction of hollow elastic tubular body

Claims (3)

[Claims] 1. A tubular shape, which is formed of a hollow elastic tubular body having a shape-retaining property, is fitted into the tubular material of the tubular cutting material, and has holes uniformly distributed over the entire outer surface thereof. Anti-vibration material for cutting the work material. 2. The vibration damping material for cutting a tubular work material according to claim 1, wherein the outer surface is provided with a continuous uneven pattern other than the holes. 3. The vibration damping material for cutting a tubular work material according to claim 2, wherein the area of the recesses of the continuous uneven pattern formed on the outer surface is 5 to 75% of the area of the outer surface.