JPS6127128A - Parts having small hole for controlling flow rate and its manufacture - Google Patents

Abstract

PURPOSE:To improve the quality and accuracy of a product by squeezing the whole periphery of a part of a pipe body in the diameter direction, deforming it plastically, and also forming a small hole for controlling a flow rate in its inside. CONSTITUTION:An upper die 8 is fixed to a piston 11, and also a pipe body 5 is squeezed and formed between its die surface 8a and a die surface 7a of a lower die 7, and a small hole for controlling a flow rate is formed. In this case, a fluid is supplied into the pipe body 5, the flow rate is measured by a measuring means 16, and based on its measured value, a working pressure of a squeezing piston 11 is made constant, or a working quantity of the upper die 8 is controlled. According to this method, in the small hole for controlling the flow rate, a working burr, etc. are not generated, and the quality of a product is improved. Also, since the squeezing quantity is controlled exactly, the accuracy of the product is also improved.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a component having small holes for fluid control and a method for manufacturing the same.

BACKGROUND OF THE INVENTION Conventionally, as shown in FIG. 9, a member ( 1), in which the inlet side (2), the outlet side (3), and the small hole (4) that communicates these are formed by cutting so that each surface is planar, or Fig. 10 And as shown in FIG. 11 (for example, Utility Model Publication No. 54-27136), a plate-shaped part
5), or a simple flat plate (6) with small holes (7) formed by press punching, electrical discharge machining, electrolytic machining, or laser machining as shown in Figures 12 and 13. be.

C6 Problems to be Solved by the Present Invention According to the parts shown in FIG.
Machining burrs occur at the connection part with 21, and when manufacturing a large number of parts, the length of the cylindrical small hole part (4) becomes uneven, resulting in large variations in flow rate and fluid pressure loss.
They must be measured and selected individually, which poses problems in terms of accuracy and production. Furthermore, there is a problem in that there is a limit to the size of the cutting tool when cutting the small hole portion (4), making it difficult to form extremely fine small holes. Furthermore, in the small holes and their processing methods as shown in FIGS. 10, 11, 12, and 13, burrs occur at the ends of the small holes (7), causing the same problem as described above. .

The present invention proposes a component having small holes for fluid control, which does not generate burrs, has very little variation in flow rate and fluid pressure loss, and can form extremely fine holes, and a method for manufacturing the same. The purpose is to solve problems.

21. Means for Solving the Problems In order to solve the above problems, the first invention provides a method of plastically deforming a part of the pipe to be processed by compressing it in the radial direction over its entire circumference. A component having a flow rate control small hole having a diameter smaller than that of other fluid passages inside the part, and a second aspect of the invention is a part having a small diameter flow control hole formed therein.
A component having a small hole for flow control, characterized in that the entire circumference is compressed in the radial direction to cause plastic deformation, and a small hole for flow control with a smaller diameter than other fluid passages is formed inside the part. The third invention is a manufacturing method, and the third invention includes a compressing means for compressing the entire circumferential surface of a part of the pipe to be processed in the radial direction;
A control means for controlling the processing amount of the squeezing means, and a measuring means for flowing a fluid in the tube to be processed and measuring the flow rate of the fluid are provided. This is a method for manufacturing a component having a small hole for fluid control, characterized in that the amount of compression by the squeezing means is controlled by the control means based on the measurement value measured by the measuring means.

E.3 Effects According to the component according to the first invention, there is no machining burr in the small diameter flow control hole as in the prior art, and variations in flow rate and fluid pressure loss due to machining burrs are reduced.
Further, according to the second invention, the above-mentioned machining burrs do not occur, and the small holes for flow rate control can be formed into very fine holes.

Furthermore, according to the third aspect of the invention, it is possible to form a predetermined small hole suitable for the fluid by controlling the amount of squeezing of the tube to be processed by the squeezing means based on the flow rate of the fluid flowing through the metal tube.

Embodiment FIGS. 1 and 2 show a first embodiment of a component having a small hole for flow rate control according to the present invention, in which a part of a pipe to be processed made of a plastic material such as metal is It is compressed in the radial direction over the circumferential direction to cause plastic deformation, and the deformed state is such that the central inner diameter surface (6a) of the compressed portion (6) becomes narrow and the both inner diameter surfaces (6b) (6c) widen. , and these surfaces are formed into a series of streamlined shapes,
A small hole portion (6d) that controls the flow rate of fluid at the narrowest portion
is formed. 3 to 6 show examples of the manufacturing method of the present invention, in which (5) is a pipe to be processed, (7)
) is the lower mold for compression, and (8) is the upper mold for compression. The lower mold for compression (7) is fixed to the press body (9), and has a streamlined mold surface (7a) to be compressed as described above formed on its upper surface. The upper die for compression (8) is -
It is fixed to the pressure cylinder 0ω piston (]1) attached to the press body (9) and is movable up and down. ) is formed. The pipe to be machined (5) to be machined inside these mold surfaces (7a) (8a)
By pressurizing the upper mold (8) toward the lower mold (7) through the intermediary of the upper mold (8), the pipe body (5) to be processed is compressed into the shape described above. Note that the flow area of the small hole (6d) is determined by this amount of compression.

(, 12) is a pressure fluid source, from which pressure fluid flows into the pressure cylinder side via a solenoid valve (13) to operate the compression piston (11).
(14) is the fluid supply source, from which the fluid passage [15]
Fluid is supplied into the processing pipe (5) through the pipe. (16) is a measuring means provided in the middle of the fluid passage (15), which measures the flow rate into the pipe to be processed (5) and controls switching of the solenoid valve (13) according to the measured amount. It has become. The compression amount is determined by setting the operating pressure of the compression piston (11) to a predetermined value or by regulating the operating amount of the upper die (8) to a predetermined value. Further, after the pressing process, the processed pipe body (5) is cut into a predetermined length to produce a product.

FIGS. 7 and 8 show other embodiments of parts having small holes for flow rate control according to the present invention. The part shown in FIG. The figure shows the shape of a barrel by squeezing both sides (6e) and (6f) of the part.
Figure 8 shows one end (6g) pressed to form a funnel shape.

(1) Effects of the Invention As described above, according to the present invention, no machining burrs are generated in the flow rate control small hole portion, so variations in flow rate and fluid pressure loss observed in the conventional cutting process are reduced. Product quality and yield can be significantly improved. Moreover, since the tube body made of plastic material is compressed in the radial direction and its inner diameter is narrowed to form small holes for flow control, it is easy to form extremely fine holes that cannot be obtained with conventional cutting or electrical discharge machining. can. Further, the inner circumferential wall surface forming the flow rate control small holes can be easily formed into a shape that follows the streamlines of the control fluid, and such a streamlined shape can reduce variations in pressure loss due to generation of eddies. Furthermore, as in the third invention, if the fluid is made to flow inside the pipe to be processed and the amount of compression is controlled by the flow rate, the control small hole can be
This allows it to be formed to the optimal diameter for the fluid to be controlled, which has the advantage of improving product precision and providing optimal flow control.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing a first embodiment of the component of the present invention, FIG. 2 is a left side view of the same, and FIG. 3 is a side sectional view showing a processed state.
Fig. 4 is a cross-sectional view of the upper mold, lower mold, and processed tube body, Fig. 5 is a front cross-sectional view showing the processing state, Fig. 6 is a cross-sectional view showing an example of the manufacturing method, and Fig. 7 is a cross-sectional view of the upper mold, lower mold, and processed tube. Fig. 8 is a side sectional view showing two other embodiments of the part, Fig. 9 is a side sectional view of the conventional part, and Fig. 10 is a side sectional view showing two other embodiments of the part.
11 are a perspective view and a sectional view showing another example of the conventional part, and FIGS. 12 and 13 are a perspective view and a sectional view showing still another example of the conventional part. (5)...Tube to be processed +61 (6e) (6f) (6g)...
Squeezing part (6d)...Small hole part (7)...Lower die for squeezing (8)...Upper die for squeezing 00)...Pressure cylinder (11)...Piston for squeezing (12) (14) ... Fluid source (13) ... Solenoid valve (16) ... Measuring means

Claims (1)

[Claims] 1. A part of the pipe to be processed is radially compressed and plastically deformed over its entire circumference, and a small hole for flow rate control with a smaller diameter than other fluid passages is formed inside the pipe. A component having a small hole for controlling flow rate. 2. A part of the pipe to be processed is compressed in the radial direction over its entire circumference to plastically deform it, and a small hole for flow rate control with a smaller diameter than other fluid passages is formed inside it. A method for manufacturing a component having a small hole for controlling flow rate. 3. Squeezing means for radially squeezing the entire circumferential surface of a part of the pipe to be processed; control means for controlling the processing amount of the squeezing means; and a control means for circulating a fluid in the pipe to be processed and for controlling the fluid. a measuring means for measuring the flow rate of the fluid, and measuring the flow rate by the measuring means while flowing the fluid into the processed pipe body,
A method for manufacturing a component having a small hole for fluid control, characterized in that the amount of compression by the compression device is controlled by the control device based on the measured value.