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Method and apparatus for fluid polishing

a technology of fluid polishing and fluid polishing, which is applied in the direction of polishing machines, metal-working equipment, manufacturing tools, etc., can solve the problems of affecting the flow rate error of the common rail injector of the diesel engine, deteriorating processing accuracy, and dropping processing capacity coefficients day by day, so as to prevent the separation of slurry and improve the processing accuracy of fine apertures

Inactive Publication Date: 2007-11-15
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This approach prevents temporary fluctuations in slurry flow rates, improves processing accuracy, and reduces processing time by maintaining constant pressure and preventing slurry degradation, thus enhancing the overall efficiency of the fluid polishing process.

Problems solved by technology

The flow rate error of a diesel engine common rail injector is greatly affected by the static oil flow rate accuracy of the orifice as a constituent component of the injector and a metering processing is made by fluid polishing.
The pressure is controlled to a constant level by the equipment but the slurry is degraded in the course of use due to wear of the abrasives and mixture of the metering oil, so that the processing capacity coefficient drops day by day.
With the drop of the processing capacity coefficient, the processing accuracy is also deteriorated, and the processing time gets gradually longer, thereby extending the cycle time (CT) of one processing process (see FIG. 9).

Method used

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  • Method and apparatus for fluid polishing
  • Method and apparatus for fluid polishing
  • Method and apparatus for fluid polishing

Examples

Experimental program
Comparison scheme
Effect test

second embodiment

[0110] Next, the invention will be explained.

[0111] FIGS. 6 to 8 schematically show a fluid polishing apparatus according to this embodiment of the invention. FIG. 6 shows a schematic of the fluid polishing apparatus 50. FIG. 7 is an explanatory view for explaining the construction of a (fluid processing) processing unit 10 of the fluid polishing apparatus 50 shown in FIG. 6. FIG. 8 is an explanatory view for explaining the construction of an (oil flow rate) measuring unit 20 of the fluid polishing apparatus 50 shown in FIG. 6. In this embodiment, the work to be processed is an orifice of an injector (fuel injection device) for a diesel engine common rail and its fine aperture is subjected to fluid polishing by the fluid polishing apparatus 50.

[0112] Referring initially to FIG. 6, the fluid polishing apparatus 50 of this embodiment includes a (fluid polishing) processing unit (portion) 10, a measuring unit (portion) 20 of an oil flow rate and a washing unit (portion) 40.

[0113] The...

third embodiment

[0133] The fluid polishing method and the apparatus for the method according to the invention provide the following effects.

[0134] The addition of the slurry is executed when the processing capacity coefficient becomes smaller than the threshold value in the same way as in the second embodiment to prevent an increase in the processing cycle time (CT).

[0135] In the embodiments described above or shown in the accompanying drawings, the feeding apparatus for feeding the slurry to the orifice as the work is a cylinder of the plunger type pump but may be various known pumps or fluid feeding apparatuses besides a plunger type pump. Two or more feeding apparatuses may be provided though one feeding apparatus is shown in the embodiments described above.

[0136] Though the foregoing embodiments represent the application of the present invention to the processing of the orifice for the diesel engine common rail injector, the invention is not particularly limited thereto but may be applied to ...

fourth embodiment

[0137] Next, the present invention will be explained.

[0138] To execute this embodiment, the processing time (T) is decided and the fluid polishing processing is carried out for this processing time (T). The processing time (T) has been determined in the past by the processing capacity coefficient (K) that is a statistical value as shown in FIG. 13.

[0139] The method of deciding the processing time in the fourth embodiment of the invention will be explained with reference to FIG. 15.

[0140] In fluid polishing processing, there is an unstable region in which the processing capacity coefficient (K) changes due to influences of the slurry condition and the work shape, in an initial stage of processing. However, it has been found, through experiment, that the processing capacity coefficient (K) becomes constant after processing is carried out for a certain predetermined time (first processing time (T0) inside the work and the processing capacity coefficient (K) is out of the unstable reg...

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Abstract

In a fluid polishing method for processing a fine aperture by slurry 7, the slurry is supplied from a cylinder 2a in a slurry flow rate target process until the flow rate increases to a target value of a slurry feed flow rate. When the flow rate reaches the target flow rate, the cylinder is stopped and switched to another cylinder 2b and the operation fluid flow rate of the fine aperture is thereafter measured. In a metering process, to be executed next, a necessary processing time is calculated on the basis of the operation fluid flow rate and polishing is carried out for a necessary processing time by another cylinder 2b. Another cylinder is then stopped and switched and the operation fluid flow rate is measured. In this way, the metering process is repeated until the operation fluid flow rate reaches a predetermined value. In each process, the supply of the slurry is not interrupted.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application is a divisional of U.S. patent application Ser. No. 11 / 509,749 filed on Aug. 24, 2006. This application claims the benefit of JP 2005-249256, filed Aug. 30, 2007, JP 2005-272176, filed Sep. 20, 2005, and JP 2005-273647 filed Sep. 21, 2005. The disclosures of the above applications are incorporated herein by reference.BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] This invention relates to a fluid polishing method and a fluid polishing apparatus for executing the fluid polishing method. More particularly, the present invention relates to a method, and an apparatus for the method, for highly precisely processing a fine aperture by using a slurry of a polishing material. [0004] 2. Description of the Related Art [0005] A large number of apparatuses exist that have a high precision fine aperture such as a nozzle tip of a fuel injector, a jet port of a carburetor, an orifice for regulating a fluid flow ra...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B24C1/08
CPCB24B31/116B24B1/00
Inventor OOKA, YASUHITO
Owner DENSO CORP