JP4467113B2 - Foreign matter removal method for pipe-shaped workpiece - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for removing foreign matter in a pipe-shaped workpiece in which a plurality of branch holes are provided in an axial peripheral wall portion of a pipe body by air blow.
[0002]
[Prior art]
An example of the pipe-shaped workpiece in which a plurality of branch holes are provided in the circumferential wall portion in the axial direction of the pipe is shown in FIG. The pipe-shaped work 1 is formed on the plurality of boss portions 1-3 provided at intervals in the axial peripheral wall portion of the pipe body 1-1 having the flow passage 1-2 in the axial center thereof. It has a structure in which a branch hole 1-4 leading to the flow passage 1-2 is provided, and a flange portion 1-6 is provided at one end of the opening 1-5 of the pipe main body 1-1. The other end of the main body 1-1 is sealed (or opened). An example of such a pipe-shaped workpiece is a common rail used for a high-pressure fuel multi-branch pipe of a diesel internal combustion engine.
[0003]
As a method for removing foreign matter that has entered the pipe-shaped workpiece, an air blow method is generally used. When removing foreign matter in the pipe-shaped workpiece by this air blow method, any one of the openings 1-5 of the flow passage 1-1 of the pipe body 1 of the pipe-shaped workpiece 1 or the plurality of boss portions 1-2 is provided. A method is used in which air is blown from the branch holes 1-3 and foreign matter is discharged from other openings. However, such a foreign matter discharge / removal method has a problem in that the foreign matter inside cannot be sufficiently discharged and removed due to insufficient pressure or flow rate of the air supplied into the pipe-shaped workpiece, dispersion of pressure, or uneven flow rate. It was.
[0004]
[Problems to be solved by the invention]
The present invention has a problem with the above-described conventional method for removing foreign matter in a pipe-shaped workpiece, that is, the internal foreign matter is sufficiently removed due to the pressure or flow rate of air supplied to the pipe-shaped workpiece, insufficient pressure distribution, or uneven flow rate. It was made to solve the problem that it cannot be discharged and removed, and it is intended to propose a foreign matter removal method for pipe-like workpieces that can almost completely remove foreign matters in pipe-like workpieces by the air blow method. It is.
[0005]
[Means for Solving the Problems]
The foreign matter removal method for a pipe-shaped workpiece according to the present invention includes a plurality of boss portions provided at intervals in an axial peripheral wall portion of a pipe body having a flow passage in an axial center thereof, and the flow passage is provided in the flow passage. In a method for removing foreign matter inside a pipe-shaped workpiece provided with a branch hole that communicates by air blow, an opening portion of any one of an opening portion of a pipe body of the pipe-shaped workpiece and an opening portion of each branch hole In a state where only one is opened and all remaining openings are closed, air is supplied from the opened opening to the flow passage of the work and the internal pressure is continuously applied to the work. One of the closed openings is opened and air blown, and then the opening is closed again and internal pressure is continuously applied to the workpiece, the next opening is opened and air blown, and then air is supplied. Continue It is characterized in that the work blockage and the air blow accompanying the opening are repeated for each opening, and after the opening is closed, it takes time for the internal pressure of the work to recover until the next opening is opened. Further, the openings are sequentially opened from the opening closest to the air supply opening.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a schematic diagram showing an apparatus configuration example for carrying out the method of the present invention, FIG. 2 is a diagram for explaining the operation of the apparatus, FIG. 3 is a schematic diagram showing another embodiment of the present invention, and FIG. FIG. 2 is a schematic view showing another embodiment, in which 1, 11 and 21 are pipe-shaped workpieces, 2 is an opening / closing device for a branch hole and an axial end of the workpiece, 2-1 is a hydraulic cylinder for opening and closing, and 2-2 is a lid , 3 is an air supply device, 3-1 is an air supply fluid pressure cylinder, 3-2 is an air supply jig, 3-3 is an air supply hole, 3-4 is a compressor, and 3-5 is an air supply pipe. , 3-6 are flow control valves, and 3-7 is a pressure gauge.
[0007]
An apparatus for carrying out the method of the present invention shown in FIG. 1 pierces three bosses 1-3 provided at intervals in an axial peripheral wall portion of a pipe body 1-1 of a pipe-like workpiece 1. It comprises a branch hole opening / closing device 2 that opens and closes the provided branch holes 1-4 separately, and an air supply device 3 that supplies air into the flow passage 1-2 of the pipe body 1-1 and applies internal pressure. The branch hole opening / closing device 2 is installed corresponding to each branch hole 1-4, and the structure thereof is configured such that the lid 2-2 is attached to the rod end of the fluid pressure cylinder 2-1 for opening and closing. The fluid pressure cylinder 2-1 opens and closes each branch hole 1-4. Further, the air supply device 3 is provided with an air supply jig 3-2 also serving as a lid at the rod end of the air supply fluid pressure cylinder 3-1, and a pipe body is provided by the air supply fluid pressure cylinder 3-1. 1-1, the air supply hole 3-3 is provided in the air supply jig 3-2 and is connected to the compressor 3-4. The air supply pipe 3-5 is connected to the air supply hole 3-3, and the air supply pipe 3-5 is provided with a flow rate adjusting valve 3-6 and a pressure gauge 3-7.
[0008]
A method for removing foreign matter from the pipe-shaped workpiece 1 using the above apparatus will be described with reference to FIG. 2. First, each branch hole 1-4 of the pipe body 1-1 of the pipe-shaped workpiece 1 is completely closed by the branch hole opening / closing device 2. Then, the opening 1-5 of the flow passage 1-2 of the pipe body 1-1 is closed by the air supply jig 3-2 of the air supply device 3. When the pipe body 1-1 of the pipe-like workpiece 1 is completely sealed, the flow rate adjusting valve 3-6 is opened to supply air into the pipe body 1-1, and the pipe body 1-1 is supplied by the compressor 3-4. Apply internal pressure inside. At this time, air is supplied into the pipe body 1-1 from the air supply pipe 3-5 and the air supply hole 3-3. The internal pressure of the pipe body 1-1 is measured and monitored by a pressure gauge 3-7.
[0009]
When the internal pressure of the pipe body 1-1 reaches a predetermined pressure, among the three branch holes 1-4, for example, only the branch hole 1-4 at the end opposite to the air supply side is opened. The opening of the branch hole 1-4 is performed for a predetermined time by moving the lid 2-2 backward by the opening / closing fluid pressure cylinder 2-1 of the opening / closing device 2 of the branch hole 1-4. When one branch hole 1-4 is opened, all the compressed air in the pipe body 1-1 is ejected from the branch hole 1-4, thereby opening the pipe body 1-1 in the flow passage 1-2 and opening it. The foreign matter in the branched hole 1-4 is discharged and removed by this air blow.
[0010]
When the air blow for a predetermined time in one branch hole 1-4 is finished, the branch hole 1-4 is closed again while continuing the air blow so that foreign matter does not enter from the branch hole 1-4. -1 is brought into an original completely sealed state, and the supply of air into the pipe body 1-1 is continued to wait for a return to a predetermined internal pressure. Thereafter, one of the remaining two branch holes 1-4 (the middle branch hole in the drawing) is opened and air blown. When the air blow of the branch hole 1-4 is finished, the branch hole 1-4 is closed again to bring the pipe body 1-1 into the original completely sealed state, and the supply of air into the pipe body 1-1 is continued. Then, a predetermined internal pressure is continuously applied. Thereafter, the air blow of the branch hole 1-4 at the end on the air supply side is similarly performed. Thereafter, the flow rate adjusting valve 3-6 is closed, the remaining branch hole 1-4 (air supply side) is opened, and the air blow is finished.
[0011]
Next, another embodiment apparatus shown in FIG. 3 is an embodiment in which air is supplied from a branch hole to remove foreign matter in the workpiece, and the shaft of the pipe body 11-1 of the pipe-shaped workpiece 11 having both ends opened. Branch hole 11-4 drilled in a plurality of boss portions 11-3 provided at intervals in the peripheral wall portion in the direction, and a branch hole that opens and closes both ends of the pipe-shaped workpiece 11 separately. An opening / closing device 2 and an air supply device 3 for supplying air from one branch hole 11-4 of the plurality of branch holes 11-4 in the flow passage 1-2 of the pipe body 1-1 and applying an internal pressure. The branch hole opening / closing device 2 and the air supply device 3 have the same configuration as that shown in FIG.
[0012]
When the foreign substance removal of the pipe-shaped workpiece 11 is performed by the apparatus shown in FIG. 3, first, both ends of the pipe body 11-1 of the pipe-shaped workpiece 11 and the plurality of branch holes 11-4 are two from the left. All the other branch holes 11-4 except for the first branch hole 11-4 are completely closed by the branch hole opening / closing device 2, and the second branch hole 11-4 from the left is connected to the air supply device 3. The air supply jig 3-2 is closed. When the pipe main body 11-1 of the pipe-shaped workpiece 11 is completely sealed in this way, the air flow adjusting valve 3-6 of the air supply device 3 is opened to supply air into the pipe main body 11-1, and the compressor 3 The internal pressure is applied to the pipe body 11-1 at -4. At this time, air is supplied from the air supply pipe 3-5 and the air supply hole 3-3 to the pipe body 11-1 through the branch hole 11-4. Also in this case, the internal pressure of the pipe body 11-1 is measured and monitored by the pressure gauge 3-7.
[0013]
When the internal pressure of the pipe main body 11-1 reaches a predetermined pressure, the both ends of the pipe main body 11-1 and the plurality of branch holes 11-4 are opened one by one in the same manner as described above while the air supply is continued. Then air blow. The opening operation of both ends of the pipe body 11-1 and the plurality of branch holes 11-4 is performed by retreating the lid 2-2 by the opening / closing fluid pressure cylinder 2-1 of the opening / closing device 2 in the same manner as described above. . When one opening is thus opened, the compressed air in the pipe body 11-1 continues to be ejected from the opening, thereby causing the inside of the flow passage 11-2 of the pipe body 11-1 and the opened branch hole. The foreign matter inside is discharged and removed by this air blow.
[0014]
When the air blow for a predetermined time of one opening is finished, the air is continuously blown so that foreign matter does not enter from the opening, and another opening is closed again to bring the pipe body 11-1 into the original completely sealed state. Is supplied into the pipe body 11-1 and a predetermined internal pressure is continuously applied. After that, open other openings and blow air. In this way, the same operation as described above is sequentially repeated for all the openings to blow air.
[0015]
Further, in the embodiment shown in FIG. 4, both ends of a pipe body 21-1 in which branch holes 21-4 are formed in a plurality of boss portions 21-3 provided at intervals in a peripheral wall portion in the tube axis direction. 3 illustrates an example of a method for removing foreign matter from a pipe-shaped workpiece 21 having a structure in which a small-diameter pipe 22 is connected to the section, and the apparatus configuration is the same as that shown in FIG.
That is, the branch hole opening / closing device 2 that opens and closes the both end openings of the small-diameter pipe 22 connected to the pipe body 21-1 and the branch holes 21-4, respectively, and the flow passage 21-2 of the pipe body 1-1 1 is provided with an air supply device 3 for supplying air from one of the plurality of branch holes 21-4 and applying an internal pressure. The branch hole opening / closing device 2 and the air supply device 3 are shown in FIG. Is the same configuration.
[0016]
When the foreign substance removal of the pipe-shaped workpiece 21 is performed by the apparatus shown in FIG. 4, as in the case of FIG. 3, both ends of the pipe body 21-1 of the pipe-shaped workpiece 21 and a plurality of branch holes 21 are provided. -4, all the other branch holes 21-4 except for the first branch hole 21-4 from the right are completely closed by the branch hole opening and closing device 2, respectively, and the first branch hole 21- from the right 4 is closed by an air supply jig 3-2 of the air supply device 3. When the pipe main body 21-1 of the pipe-like workpiece 21 is completely sealed in this way, the air flow adjusting valve 3-6 of the air supply device 3 is opened to supply air into the pipe main body 21-1, and the compressor 3 The internal pressure is applied to the pipe body 21-1 at -4. At this time, air is supplied from the air supply pipe 3-5 and the air supply hole 3-3 through the branch hole 21-4 into the pipe body 21-1. Also in this case, the internal pressure of the pipe body 21-1 is measured and monitored by the pressure gauge 3-7.
[0017]
When the internal pressure of the pipe main body 21-1 reaches a predetermined pressure, both ends of the pipe main body 21-1 and the plurality of branch holes 21-4 are opened one by one in the same manner as described above to perform air blowing. The opening operation of both end openings of the pipe body 21-1 and the plurality of branch holes 21-4 is performed by retreating the lid 2-2 by the opening / closing fluid pressure cylinder 2-1 of the opening / closing device 2, as described above. . When one opening is thus opened, the compressed air in the pipe body 21-1 is ejected from the opening, thereby causing the inside of the flow passage 21-2 of the pipe body 21-1 and the opened branch hole. The foreign matter is discharged and removed by this air blow.
[0018]
Also in the case of this example, when the air blow for a predetermined time of one opening is finished, another opening is closed again while continuing the air blow so that foreign matter does not enter from the opening, and the pipe body 21-1 is restored. The air is completely sealed, and the supply of air into the pipe body 21-1 is continued to apply a predetermined internal pressure. After that, open other openings and blow air. In this way, the same operation as described above is repeated for all the openings to blow air.
[0019]
In the above apparatus, in order to prevent the discharged foreign matter from scattering to the surroundings, the entire apparatus is surrounded by, for example, a partition plate or a hood, and a foreign matter suction duct is provided to collect the discharged foreign matter. Constitute. Further, the order of air blowing is preferably performed in order from the side closer to the air supply port so that foreign matter in the opening that has not yet been air blown adheres to the air blown opening. In addition, it is preferable to provide a time for the pressure in the pipe-shaped workpiece to recover to a predetermined pressure between the openings.
[0020]
【The invention's effect】
As described above, according to the present invention, since all the compressed air supplied to the inside of the pipe-shaped workpiece is concentrated and blown into the open branch hole, the pressure of the air supplied into the pipe-shaped workpiece is Insufficient flow rate, pressure dispersion, flow rate imbalance, etc. are eliminated, and the air blow method can remove foreign matters in the pipe-like work almost completely. It greatly contributes to the removal of foreign matter from pipe-shaped workpieces such as common rails used for branch pipes.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing an example of the configuration of an apparatus for carrying out the method of the present invention.
FIG. 2 is an explanatory diagram of operations by the apparatus.
FIG. 3 is a schematic view showing another embodiment of the present invention.
FIG. 4 is a schematic view showing another embodiment of the present invention.
FIG. 5 is a cross-sectional view showing an example of a pipe-shaped workpiece that is a subject of the present invention.
[Explanation of symbols]
1, 11, 21 Pipe-shaped workpieces 1-2, 11-2, 21-2 Flow passages 1-3, 11-3, 21-3 Boss portions 1-4, 11-4, 21-4 Branch holes 1-5 Opening 2 Branch hole opening and closing device 2-1 Opening and closing fluid pressure cylinder 2-2 Lid 3 Air supply device 3-1 Air supply fluid pressure cylinder 3-2 Air supply jig 3-3 Air supply hole 3-4 Compressor 3-5 Air supply piping 3-6 Flow control valve 3-7 Pressure gauge

Claims (1)

In the method of removing the foreign matter inside the pipe-shaped workpiece provided with a plurality of branch holes by maintaining an interval in the axial peripheral wall portion of the pipe body having a flow passage inside the axial direction by air blow, In a state where only one of the openings of the flow passage of the pipe body of the pipe-shaped workpiece and the opening of each branch hole is opened and all the remaining openings are closed, the flow passage of the workpiece is Air is supplied from the opened opening and internal pressure is continuously applied to the workpiece, and one of the closed openings is opened and air blown in a state where the air supply is continued, and then the opening is opened. continued over pressure and closed again in the work, the air blown by opening the following opening, said workpiece closed while continuing the subsequent air supply to each opening, and repeat the air blow caused by the opening, And the opening After closing the, with the internal pressure of the workpiece takes time to recover until opening the next opening, a pipe-shaped, wherein the opening is sequentially opened from the closest opening in the air supply opening Foreign matter removal method for workpieces.

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