Metal deforming – By use of roller or roller-like tool-element
Patent
1999-05-26
2000-07-18
Butler, Rodney A.
Metal deforming
By use of roller or roller-like tool-element
B21B 1304
Patent
active
060890681
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method of manufacturing a metallic shaft having a fluid flow passage immediately below a surface thereof.
BACKGROUND ART
Normally, a lubricating oil is used to smoothly rotate a rotating shaft born by slide bearings or reciprocate a columnar-shaped shaft such as sliding valve discs used in slide valves, and consideration is taken so as to provide the lubricating oil with a function of preventing seizure with a cooling effect, by which heat generated is removed, in addition to functions of reducing frictional resistance, maintaining airtightness and so on.
When the lubricating oil becomes short, such cooling capacity decreases to cause a condition of partial seizure on an associated shaft. Because such partial seizure further impedes smooth flow of the lubricating oil, the entire shaft undergoes seizure and eventually rotation or reciprocation of the shaft is made impossible.
In order to prevent such accident, an oil groove or grooves are sometimes formed on the shaft surface to avoid a shortage of an amount of a lubricating oil. However, such measures are problematic in that as an operation goes on, a foreign matter such as abrasion debris or the like generated due to friction will accumulate in such oil groove or grooves to clog a flow passage of the lubricating oil, resulting in the lubricating and cooling function being impeded.
DISCLOSURE OF INVENTION
The present invention has been achieved in order to solve the problems of the prior art, and has its object to provide a method of manufacturing a shaft having a flow passage, which is designed such that fluid flow is hard to be impeded, at low cost and with ease.
To cope with the situation, the inventors of this application have found in the course of study on a construction, in which a spiral-shaped pipe for fluid flow is arranged on a surface of a columnar-shaped shaft that a rolling method provides measures for solving the problems, and have completed the invention.
Thus the invention provides a method of manufacturing a shaft having a flow passage below a surface thereof, through which a fluid can flow, comprising a preliminary step of forming in a surface of a columnar-shaped base material thread grooves having a substantially U-shaped cross section, and a finishing step of compressing crests of thread ridges between the adjacent thread grooves in a direction, in which the base material is reduced in diameter, to perform plastic deformation of the crests and join the deformed crests to one another to form a spiral-shaped, closed space which communicates spaces in the thread grooves.
Here, the invention can be embodied in the following respective modes:
(1) A mode, in which the preliminary step comprises a first preliminary step of forming in the surface of the columnar-shaped hose material thread grooves having a substantially V-shaped cross section, and a second preliminary step, being effected subsequent to the first preliminary step, of expanding the thread grooves having the substantially V-shaped cross section to form thread grooves, of which valleys are arcuate, and which have a substantially U-shaped cross section.
(2) A mode, in which the finishing step is effected in rolling, in which the base material having been formed in a surface thereof with the thread grooves having a substantially U-shaped cross section is interposed between a movable flat-plate die and a stationary flat-plate die, and the base material is made to be pressed and rolled.
(3) A mode, in which the second preliminary step and the finishing step are effected in a series of rolling processings, in which the base material having been formed in a surface thereof with the thread groove having a substantially V-shaped cross section is interposed between a movable flat-plate die and a stationary flat-plate die and the base material for shaft is made to be pressed and rolled.
BRIEF DESCRIPTION OF DRAWING
FIGS. 1(A), 1(B), 1(C) and 1(D) are views illustrating main steps in the invention.
BEST MODE FOR CARRYING OUT THE
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Kato Keigo
Mizuno Masataka
Aoyama Seisakusho Co., Ltd.
Butler Rodney A.
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