Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Powder pretreatment
Reexamination Certificate
2000-04-05
2001-10-30
Jenkins, Daniel J. (Department: 1742)
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Powder pretreatment
C419S047000
Reexamination Certificate
active
06309592
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a method for manufacturing the roller carrier, and especially to a method for manufacturing the roller carrier of a vibration balance device, which can reduce all the vibration from the eccentricity in rotation so as to maintain at a balance condition, in the method, a manufacturing process of metal powder metallurgy is used to manufacture the roller carrier.
BACKGROUND OF THE INVENTION
In the rotation device with high rotary speed, since the center of gravity is uneasily to be controlled to be at the center of the rotary axis. Therefore, the eccentricity will induce vibration as the rotary speed is high. Such vibration will deteriorate the performance of the device, reduce lifetime, destroy the structure and induce noise so as to cause some troubles to the users. Therefore, a vibration balance device is designed, in that a rotation device is added to the rotary body. As the rotation device rotates, the roller can roll to a balance position for balancing the eccentricity so as to reduce the vibration. While the surface friction, material and precision of the rotation device all affect the balance of the roller.
The prior art vibration balance device mainly includes rollers (for balancing eccentricity), roller carrier (carrying the roller and provides a predetermined operation direction). The surfaces of the rollers and the roller carrier must be very smooth so as to reduce the relative friction. While the material properties (such as hardness), roughness, precise of the roller carrier have a close relation to the balance. In general, in mass production, the roller carrier is made by plastic injection molding or cutting from metal followed by a polishing process. Although the injection molding has a cost, but the hardness and precise in dimensions are worse than those from cutting followed with a polishing process. But the cutting process needs a higher cost and much work time.
Therefore, there is an eager demand for a novel method for manufacturing the roller carrier of a vibration balance device, by which, the defect can be improved.
SUMMARY OF THE INVENTION
Accordingly, the primary object of the present invention is to provide a method for manufacturing the roller carrier of a vibration balance device. The roller carrier according to the present invention uses less materials, can be mass-produced, has a precise dimension, is light weighted, has a smooth surface and has a higher surface hardness. In other word, the roller carrier made from the manufacturing process of metal powder metallurgy not only has preferred physical properties, such as good hardness, smoothness and precision, but also can reduce the vibration from the eccentricity of rotation. Moreover, the manufacturing cost can be reduced greatly and yield is increased. Therefore, the present invention is economical.
Another object of the present invention is to provide a method for manufacturing the roller carrier of a vibration balance device, the roller carrier being installed with at least one round track around a rotary axis thereof for carrying a plurality of rollers; characterized in that: the roller carrier is made of alloy powder and made by a process of metal powder metallurgy. The material of the powder is SUS-316L or other proper alloy powder. The manufacturing process of the metal powder metallurgy includes the steps of: feeding material, compacting, sintering, and sizing, or other manufacturing process of the metal powder metallurgy (metal injection molding,MIM) can be used, which includes the steps of feeding material, pelletizing, injection molding, debinding, sintering, and sizing. Therefore, the aforesaid objects of improving the quality and reducing the cost are achieved.
The various objects and advantages of the present invention will be more readily understood from the following detailed description when reading in conjunction with the appended drawing.
REFERENCES:
patent: 4350087 (1982-09-01), Ramirez
Chen Tzu-Nan
Chuang Jui-Nan
Liao Cheng-Yao
Wang Ta-Hsiang
Jenkins Daniel J.
Lite-On It Corporation
Rosenberg , Klein & Lee
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