JPH02229962A - Securing method for diaphragm - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method of fixing a diaphragm to its supporting flange. [Prior art and its problems] A diaphragm device works on both sides of the diaphragm.
It deflects due to pressure differences and uses that deflection to detect pressure, and is often used in pressure-related equipment such as pressure control and pressure-based operations. This diaphragm fixing means includes a first
As shown in Figure 1, the entire periphery of the diaphragm D is shown in Table 112.
It is generally supported and fixed with two annular flanges (cases) 2, 2. This conventional fixing means has both flanges 2
, 2 through the green circumference of the diaphragm D with epoxy, silicone adhesive, etc., or low 1 (190 to 210
℃) They are integrated by soldering. However, with this conventional means, the diaphragm D and the flanges 2, 2 must be fixed until the adhesive and solder harden, resulting in poor productivity. Adhesives and solders also have problems in terms of heat resistance, and they also have the problem of not being able to maintain constant properties over a long period of time. In other words, aging is a problem. The present invention takes the above points into consideration and aims to solve the above problems by supporting and fixing the flange itself. [Means for Solving the Problem] In order to achieve the above object, the present invention first has the following features:
The entire outer periphery of the diaphragm is fixed to the inner surface of an annular flange having an L-shaped cross section, and the entire outer periphery of the diaphragm is pushed downward by a punch whose lower surface, which serves as a pressing surface, is curved outward and downward; a first step of inserting the peripheral edge into a downward groove formed along the folded line on the inner surface of the flange; - receiving the flange with a lower mold that closely fits the horizontal lower surface and inner surface of the flange; a second step of pressing the outer periphery of the upper surface of the rising part with a punch whose lower surface, which serves as the pressing surface, is curved outward and downward, to turn the rising part inward; - a state in which the flange is received by the lower die; The third step is to press the fallen flange rising portion downward with a punch whose lower surface, which serves as a pressing surface, is inclined outward and upward. If the above flange is made of the same material as the diaphragm,
It has good crimp performance and is preferably an annealed material. [Operation] The method for fixing a diaphragm according to the present invention configured as described above includes first inserting the entire outer circumferential edge of the diaphragm into the groove in the first step, and then, in the second step,
By tilting the rising part of the flange inward, the groove collapses and the entire outer circumference of the diaphragm is fixed to the flange. In this state, in the third step, by further crushing (caulking) the rising portion of the flange, the outer circumferential edge of the diaphragm is supported and fixed between the flanges, and the outer circumferential edge of the diaphragm is directed outwardly by the outwardly upwardly inclined pressing surface. (centrifugal direction) tension is applied. [Example 1] First, a method for manufacturing diaphragm D will be explained. As shown in FIG. 3, spiral ripples P are formed around the central circle 10 by adjoining each other from the tertiles, and the height of the waves is t as shown in FIG. Difference in height:
T, curvature of diaphragm D: R, curvature of valley of ripple P: r
, and the curvature of the same peak: r' were each set to a predetermined value. These values are selected appropriately through experiments, etc., taking into account the location of the diaphragm D, the material, etc. If the center circle 10 is also curved as shown by the chain line in Figure 4, the border with the ripple P can be made smooth. The above-mentioned diaphragm D is manufactured by press-forming and punching using a die designed based on the above-mentioned specifications (shape).・Molds are basically produced by electrical discharge machining,
It is used after adjustment. To manufacture the electric discharge machining S for manufacturing the mold, for example, the specifications of the diaphragm D are input into a milling machine capable of three-dimensional numerical control, and the end mill is used to form the surface of the electrode material plate as shown in Fig. 5. The ripple P shown in
It is manufactured by forming unevenness that exhibits.

As shown in FIG.
6. Mold W requires a male mold and a female mold, which can be obtained by the above-mentioned electric discharge machining. By forming two molds W and performing the electrical discharge machining using one of them as an electrode, both male and female molds can be obtained from the processed product and the remaining mold W.

Using the above manufacturing method, prototypes 1 to 4 with the specifications (t, T, etc.) shown in Table 1 below were manufactured. All stainless steel foil (hoop) was used, its thickness: 0.015+as, curvature R: 100 m, finished outer diameter of diaphragm D:
25.4ffIII is the same in each example. In addition, the cross section of the ripple P of prototype example 1 is as shown in Figure 4~), and the others are as shown in Figure 4 (a
) throat and 《. Note that the number of turns of the ripple P is determined by the width of the ripple P (each interval d), and it was 1 and a half turns for prototypes 1 and 2, and 2 turns for prototypes 3 and 4.

The diaphragm D manufactured in this way is supported and fixed on the inner surface of the annular flange 2 as shown in FIG. Figure 7 shows the displacement measurement results.

As shown in FIG. 2(a), the above-mentioned support and fixation is carried out by first fixing the annular flange 2 having an L-shaped cross section on the base plate 3, and placing the diaphragm D as shown by the chain line on the horizontal portion 2a of the annular flange 2 as shown in FIG. As shown, the bunch 4 whose lower surface 4a, which is a pressing surface, curves outward and downward, pushes the entire outer periphery of the diaphragm D downward as shown by the solid line to bend it into a flat plate, and the entire outer periphery is pressed against the inner surface of the flange 2. Insert it into the downward groove 2C along the folding line. This inserted state is maintained by inserting the outer peripheral edge of the diaphragm D, which is originally in a horizontal state, into the downward groove 2c, so that the outer peripheral edge comes into contact with the upper surface of the groove 20 by the restoring force. Next, as shown in FIG. 2(b), the flange 2 in the above state is supported by a lower mold 5 in which the lower surface and inner surface of the horizontal portion 2a are closely fitted, and the lower surface 6a, which becomes the pressing surface, is directed outward and downward. Using the curved punch 6, push the outer periphery of the upper surface of the rising portion 2b of the flange 2 to incline it inward. Due to this action, the groove 20
is crushed and the entire outer periphery of diaphragm D is fixed to flange 2 (see Figure 2 (C)). Furthermore, as shown in FIG. 2(C), instead of the punch 6,
The bunch 7, whose lower surface 7a serving as a pressing surface is inclined outward and upward, pushes the fallen flange rising portion 2b downward.
Due to this action, flange 2? The outer peripheral edge of the diaphragm D is supported and fixed between the flanges 2, and the second
As shown in Figure (d), tension is applied to the outer periphery of diaphragm D in the outward direction (centrifugal direction). Since this tension is applied evenly over the entire circumference of the diaphragm D, the bending action becomes uniform. In other words, the characteristics are stable. From Fig. 7, prototype examples 3 and 4 have a large rise (200 to 500 mmH).
zO), and there is a digital output (ON-OF) at that point.
It can be seen that it is better to allow it so as to obtain F). In any case, each example can be used satisfactorily depending on the purpose.

[Example 2] As shown in FIG. 8, in this example, concentric circular ripples P1 are formed adjacent to the center circle 10, and
Isomorphic ripples P on the outside as well. , and both ripples P. , Pg, there are spiral ripples P from the surrounding thirds of the concentric circular ripples P,
■, and the beginning and end of the ripple P, are both ripples P,, Pg
It is a combination of ? For the diaphragm D, first, the specifications of the diaphragm D are inputted into a slicing machine capable of three-dimensional numerical values, and the 10th
The electrode S is manufactured by forming unevenness exhibiting the ripples Pl, Pt, and Ps shown in the figure.

Next, this electrode S is attached to an electric discharge machine in the same manner as described above, a mold W is manufactured, and the diaphragm D shown in FIGS. 8 and 9 is obtained by press working using this mold W. Ta. During this press forming, circular ripples P1 and P2 are formed on the inner and outer sides, and both ends of the spiral ripple P, merge with the ripples P+, Pg, so the distortion caused by the formation of the spiral ripple P causes the circular ripple. P. , P■ was bitten and no wrinkles were formed. This diaphragm D is also made of stainless steel foil with a thickness of 0.015 mm and a finished outer diameter of 25.4 mm, as shown in Figure 8.
In FIG. 9, each ripple P. ．． ．． Pt, P, (generic name:
P) convergence d (excluding valleys and confluences): 1.05
4! lm, trough diameter of concentric circular ripples P1: 5.9 ms, inner diameter of outer ripples P: 18.7 sm, trough curvature r of spiral ripples P: o. 7mm, peak curvature: r': 0.1tm,
A wave height t: 0.15 mm, a height difference T: 1.5 mm, and a diaphragm D curvature R: 100 mm were manufactured, and as shown in Figures 1 and 2, they were prepared in the same manner as described above. According to the invention, when it was supported and fixed from the flange 2, it deflected evenly in the circumferential direction, and there was no uneven stress. It should be noted that the dimensions of each part of the diaphragm D are not limited to those shown in the examples, and it is of course possible to use other known materials such as metal materials other than stainless steel foil, rubber, and plastics as the material for the diaphragm D. It is. [Effects of the Invention] As is clear from the above description, in the present invention, since the diaphragm is pulled uniformly in the centrifugal direction all around the circumference, the bending action is uniform and uniform, and the characteristics are stabilized. In addition, since the supporting fixation (integration) is completed when the crimping (crimping) is completed, the center of the diaphragm can be reliably brought out, and productivity is also good. Furthermore, since there is no intervening low-flammability, low-melting material such as adhesive or solder, it is heat resistant and there is no risk of deterioration over time.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the diaphragm in a fixed state according to the present invention, FIGS. 2(a) to (d) are action explanatory diagrams of an embodiment of the diaphragm fixing method according to the present invention, and FIG. 3 is a perspective view of the diaphragm according to the present invention. Front view of an example of a diaphragm according to FIGS. 4(a) and 4(b)
is the same sectional view, FIGS. 5 to 6 are illustrations for explaining the production of the same example, FIG. 7 is a pressure displacement measurement diagram, FIG. 8 is a front view of another diaphragm example, FIG. 9 is the same sectional view, and FIG. FIG. 10 is a manufacturing explanatory diagram of the same example, and FIG. 11 is an explanatory diagram of a conventional example. D...diaphragm, 2...flange, 2a...horizontal part, 2b...rising part, 2c...downward groove, 4, 6, 7...
...Punch, 4a, 6a, 7a...Lower surface (pressing surface), 5...Lower die. Fig. 2 Fig. 4 (b) and 3 Fig. 5 Fig. 6 Fig. 8 Fig. 10 Fig. 7 Hito l Crow 11tυ Fig. 9 Fig. 11 D

Claims (1)

[Claims] (1) When fixing the entire outer periphery of the diaphragm to the inner surface of the annular flange having an L-shaped cross-section, the entire outer periphery of the diaphragm is fixed downward using a punch whose lower surface, which serves as a pressing surface, is curved outward and downward. a first step of pushing and inserting its peripheral edge into a downward groove formed along the folded line on the inner surface of the flange; - receiving the flange with a lower mold that closely fits the horizontal lower surface and inner surface of the flange; a second step of pressing the outer periphery of the upper surface of the rising portion of the flange with a punch whose lower surface, which serves as a pressing surface, is curved outward and downward, to turn the rising portion inward; - receiving the flange with the lower mold; A method for fixing a diaphragm comprising: a third step of pushing the fallen flange rising portion downward with a punch whose lower surface serving as a pressing surface is inclined outward and upward;