JP2604434Y2 - Anti-vibration damper - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration damper for preventing vibration during precision machining of an outer surface of a thin metal pipe. The anti-vibration damper of the present invention is used for precision outer surface processing of an Al substrate for a photosensitive drum such as a-Si.

[0002]

2. Description of the Related Art In the manufacture of a photosensitive drum, the outer surface of a metal pipe made of Al or the like is cut and roughed, and then subjected to precision cutting and mirror-finished. The degree of mirror finish is
Significantly affects the performance of the photosensitive drum. A photosensitive layer such as a-Si or a-Se is formed on the mirror-finished metal pipe to form a photosensitive drum.

[0003] However, at the time of cutting a metal pipe, fine scratches occur due to resonance between the turning tool and the pipe of the lathe. This flaw is called a chatter mark, and this resonance is called chatter vibration. Chatter vibration is high-frequency vibration and is generated by resonance between the turning tool and the pipe of the lathe, and is generated both at the time of rough processing and at the time of precision processing in the next step. The chattering causes scratches on the outer surface of the pipe and lowers the performance of the photosensitive drum.

[0004] As a countermeasure against chatter vibration, the inventor of FIG.
Vibration damper 1 made of urethane rubber elastic material such as
0 was attached to the inner surface of a metal pipe to try to absorb chatter vibration. This anti-vibration damper 10
Was effective for large-diameter pipes having an outer diameter of 80 mm or more, but was not effective for small-diameter pipes having an outer diameter of 50 mm or less.

[0005]

An object of the present invention is to provide an anti-vibration damper for absorbing chatter vibration which is effective even for small-diameter pipes.

[0006]

In this invention, in order to prevent vibration during precision machining of the outer surface of an Al metal pipe for a photosensitive drum having an outer diameter of 50 mm or less, a heavy rod as a vibration damper is inserted and fixed in the pipe. A damper, which has a thickness of 1 m on the surface of the weight rod to be in contact with the inner surface of the Al metal pipe.
It is characterized by being covered with a rubber elastic body of m to 20 mm.

As the weight rod, a ceramic rod or the like may be used in addition to a metal rod such as stainless steel or steel. Further, the anti-vibration damper of the present invention is used for an Al metal pipe for a photoreceptor drum having an outer diameter of 50 mm or less.
mm or less and the thickness is 5 mm or less, more specifically, 3 mm or less. As the rubber elastic body, a hard or soft vibration-proof rubber or the like is used, and the thickness is 1 mm to 20 mm, more preferably 1 to 10 mm, in order to effectively absorb chatter vibration.

The anti-vibration damper of the present invention cuts the photosensitive drum base, which requires precise mirror finishing of the outer surface, especially a-Si.
It is particularly effective for precision cutting of the photosensitive drum Al substrate, but it may be used for the outer surface precision machining of another aluminum drum pipe for the photosensitive drum.

[0009]

In the present invention, a weight rod made of metal or the like coated with a rubber elastic body having a thickness of 1 mm to 20 mm is used as a core material of the vibration damper, and the vibration damper is weighted. Thereby, chatter vibration, which is high-frequency vibration during lathe processing, is absorbed, and occurrence of chatter marks is prevented.

[0010]

FIG. 1 shows a first embodiment. In the figure,
Reference numeral 2 denotes an anti-vibration damper, and 4 denotes a stainless metal bar, which is an example of a heavy bar. In addition to the weight rod, a rod made of steel, Al, ceramic, or the like may be used. Numeral 6 is a rubber elastic body made of hard urethane rubber. The thickness is 1 mm or more for effectively absorbing chatter vibration and increasing the adhesion to the inner surface of the pipe of the workpiece. Elastic rubber for use. Since the chatter vibration becomes smaller as the diameter of the pipe of the workpiece increases, the metal rod 4 may be thin. For example, outer diameter 50
mm metal pipe, the diameter of the metal rod 4 is 1
The thickness of the rubber elastic body 6 may be about 20 mm at the upper limit.
m.

FIG. 2 shows another embodiment. This embodiment is the same as the embodiment of FIG. 1 except that a rubber elastic body 8 wound with a urethane hard rubber sheet is used.
In this case, not the thickness of the sheet itself but the thickness of the whole wound is 1 mm to 20 mm.

FIGS. 3 and 4 show a vibration damper of a comparative example. The vibration damper 10 in FIG. 3 uses a hard urethane rubber rod as it is as a vibration damper. The anti-vibration damper 14 shown in FIG. 4 has a hollow portion 12 provided at the center of a hard urethane rubber rod.

FIG. 5 shows how the vibration damper 2 is used. In the drawing, 16 is an Al pipe for a photosensitive drum of a workpiece, 18 is a rotation holding mechanism of a lathe, 20 is a base of the lathe, 22 is a shaft, 24 is a truncated conical center, and the bottom surface 26 is a shaft 22. It is fixed to. The anti-vibration damper 2 is inserted into the metal pipe 16 so as to be in close contact with the metal pipe 16, and the metal pipe 16 is held by pressing the edge center 24 from both ends, and is rotated at, for example, 700 to 1500 rpm to perform mirror finishing with the cutting tool 28. . The feed amount during mirror finishing is, for example, 1.0 to 7.0 mm / sec in the axial direction. At this time, the vibration damper 2 is not particularly fixed to the metal pipe 16. However, the rotation of the metal pipe 16 is transmitted to the vibration damper 2 through the rubber elastic body 6, and the vibration damper 2 rotates together with the metal pipe 16.

If the metal pipe 16 has a small diameter and a small diameter, resonance occurs between the metal pipe 16 and the cutting tool 28 due to high-speed rotation, which appears as chatter vibration. However, the anti-vibration damper 2 weighted here
With the use of, the vibration can be suppressed by the rubber elastic body 6 and the chatter vibration can be eliminated while suppressing the resonance by its weight. Table 1 shows the results of performance tests of the vibration dampers of FIGS. 1 to 4. The metal pipe used is a metal Al pipe having an outer diameter of 30 mm, an inner diameter of 25 mm, and a length of 258 mm.
The weight is about 160 g. Each of the vibration dampers used was 220 mm in length, 25 mm in outer diameter, and had a metal pipe 16
Was used so as to be in close contact with the inner surface of the sample. Hard urethane rubber was used for each of the rubber elastic bodies. Sample 1 was the conventional vibration damper 14 of FIG. 4 in which the outer diameter D2 of the damper 14 was 25 mm and the inner diameter D1 of the hollow portion 12 was 10 mm. Sample 2 is the conventional example shown in FIG. 3 and the outer diameter D2 of the vibration damper 10 was 25 mm. Samples 3 and 4 are the embodiment of FIG.
The diameter of the metal rod 4 (the inner diameter of the rubber elastic body 6) was defined as the inner diameter D1, and the outer diameter of the rubber elastic body 6 was defined as the outer diameter D2.

[0015]

[Table 1]

The crosses in the table indicating the presence or absence of chatter marks indicate the case where chatter marks have occurred over an area equal to or more than 1/2 of the outer peripheral surface of the workpiece, and the Δ marks indicate spots on the outer peripheral surface of the workpiece. This indicates that a chattering mark has occurred, and a circle indicates that the chattering mark cannot be detected. Here, the chatter mark has a surface roughness of 0.15 μm or more and has a processing mark drawn on the outer peripheral surface of the metal pipe 16 at an angle to the circumferential direction. On a normal surface, the processing mark is drawn in the circumferential direction of the metal pipe 16. As is clear from the table, the use of the metal rod 4 reliably eliminated the chatter mark. The diameter of the metal rod 4 is preferably 10 mm or more because a sufficient effect can be obtained with 15 mm. In the case of a metal pipe having an outer diameter of 80 mm, chattering vibration could be eliminated with the vibration damper of FIG. Therefore, the vibration damper of the present invention is used for an Al metal pipe having an outer diameter of 50 mm or less.

[0017]

[Effects of the Invention] In this invention, the use of a weight rod as a core material of a vibration damper prevents chattering vibration even in a metal Al pipe having an outer diameter of 50 mm or less, and obtains a smooth mirror surface without scratches. Can be. In this invention, by covering the outer surface of the weight rod with a rubber elastic body having a thickness of 1 mm to 20 mm, vibration can be effectively absorbed and the adhesion between the damper and the metal pipe can be enhanced.

[Brief description of the drawings]

FIG. 1 is a perspective view of an anti-vibration damper according to an embodiment.

FIG. 2 is a perspective view of an anti-vibration damper according to another embodiment.

FIG. 3 is a perspective view of a conventional vibration damper.

FIG. 4 is a perspective view of a conventional vibration damper.

FIG. 5 is a sectional view showing a use state of the vibration damper of the embodiment.

[Explanation of symbols]

 2 Anti-vibration damper 4 Metal rod 6 Rubber elastic body

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-64-58453 (JP, A) JP-A-63-295101 (JP, A) JP-A-56-21707 (JP, A) 103543 (JP, U) Japanese Utility Model Showa 60-40819 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16F 15/10-15/13 B23Q 11/00

Claims (1)

(57) [Scope of request for utility model registration] 1. An anti-vibration damper in which a heavy rod serving as an anti-vibration damper is inserted and fixed in an Al metal pipe for a photosensitive drum having an outer diameter of 50 mm or less during precision machining of the outer surface of the pipe. An anti-vibration damper, characterized in that a rubber elastic body having a thickness of 1 mm to 20 mm is coated on a surface of a weight rod to be brought into contact with an inner surface of the Al metal pipe.