Metal diaphragm and method for manufacturing the same

Abstract

The metal diaphragm of the present invention is a diaphragm having a partially spherical shell shape, which is formed by a stamped part of a rolled metal sheet made of a metal with rolling anisotropy. It is characterized in that it has an identification portion in at least one of the following directions: a first direction in the circumferential direction of the partially spherical shell shape at 45°±6° from the rolling direction of the aforementioned rolled metal sheet; a second direction in the circumferential direction of the aforementioned partially spherical shell shape at 135°±6°; a third direction in the circumferential direction of the aforementioned partially spherical shell shape at -45°±6°; and a fourth direction in the circumferential direction of the aforementioned partially spherical shell shape at -135°±6°.

Description

Technical Field

[0001] This invention relates to a metal diaphragm and a method for manufacturing the same. This application claims priority based on Japanese Patent Application No. 2024-007920, filed on January 23, 2024, the contents of which are incorporated herein by reference. Background Technology

[0002] The diaphragms used in cleaning valves generally require high elasticity, thus necessitating the use of cold-rolled sheet metal. This sheet metal exhibits rolling anisotropy, meaning that even deep drawing by simply pressing the material to form a concave spherical shape cannot achieve the desired partial spherical shape.

[0003] To obtain a partial spherical shell shape, deep drawing is required using a metal die shape that takes into account the anisotropy of rolling, but at this time the rolling direction of the metal sheet needs to be identified.

[0004] As a method for identifying the rolling direction, for example, one could consider setting identification marks on the metal sheet based on printing, etching, cutting, etc.

[0005] Patent Document 1 below discloses a technique for forming slits along the rolling direction in a metal sheet.

[0006] Patent document 2 below discloses a technique for forming an orientation flat along the rolling direction on a metal sheet.

[0007] Prior art literature Patent documents Patent Document 1: Japanese Patent Application Publication No. 09-014441; Patent document 2: Japanese Patent Application Publication No. 09-248631. Summary of the Invention

[0008] The problem that the invention aims to solve In the deep drawing process of highly elastic metal sheets, sufficient processing accuracy is required, especially to minimize the offset of the deep drawing position relative to the rolling direction of the metal sheet.

[0009] However, the rolling direction or its right-angle direction is easily affected by the deep drawing process, and therefore it is not always easy to determine the correct orientation.

[0010] In addition, when a notch or positioning edge is formed in the rolling direction or its right angle, or when a highly elastic metal sheet with rolling anisotropy is formed, there is a problem that the partial spherical shell shape is prone to deformation after forming.

[0011] Therefore, in view of the above-mentioned problems, the present invention aims to provide a metal diaphragm capable of high-precision deep drawing and a method for manufacturing the diaphragm.

[0012] Solution for solving the problem (1) The metal diaphragm involved in the present invention is a diaphragm formed by a stamped part of a rolled metal sheet with rolling anisotropy and having a partially spherical shell shape, characterized in that it has an identification portion in at least one of the following directions: a first direction in the circumferential direction of the partially spherical shell shape at 45°±6° from the rolling direction of the aforementioned rolled metal sheet; a second direction in the circumferential direction of the aforementioned partially spherical shell shape at 135°±6°; a third direction in the circumferential direction of the aforementioned partially spherical shell shape at -45°±6°; and a fourth direction in the circumferential direction of the aforementioned partially spherical shell shape at -135°±6°.

[0013] In a metal diaphragm composed of a stamped part of a rolled metal sheet with anisotropic rolling properties, by providing identification parts in any of the first to fourth directions, when the stamped part is bent along the rolling direction and then deep-drawn to obtain a partially spherical shape, bending can be performed with reliable control over the bending direction, followed by deep-drawing. By performing deep-drawing based on correctly selecting the bending direction, a metal diaphragm with the target partially spherical shape can be obtained.

[0014] In contrast, it is not easy to determine the direction when bending a blank without an identification part. If the direction is incorrect during bending, a metal diaphragm with a partial spherical shape that has the target shape cannot be obtained.

[0015] Furthermore, by providing identification parts in the rolling direction or the direction perpendicular to the rolling direction, the directionality during bending processing can also be determined. However, if identification parts such as notches or positioning edges are provided in the rolling direction or in a direction perpendicular to the rolling direction, stress is applied to the blanking part during deep drawing, causing deformation in the partial spherical shell shape starting from the identification parts such as notches or positioning edges. This deformation in the partial spherical shell shape is an undesirable defect for the diaphragm, which is a precision part. Therefore, by providing identification parts in any of the aforementioned first to fourth directions, it is helpful to form a partial spherical shell shape without deformation.

[0016] (2) In a metal diaphragm according to one aspect of the present invention, preferably, the first direction is 45°±3° upward from the aforementioned top view circumference, the second direction is 135°±3° upward from the aforementioned top view circumference, the third direction is -45°±3° upward from the aforementioned top view circumference, and the fourth direction is -135°±3° upward from the aforementioned top view circumference.

[0017] Preferably, the first direction is 45°±3°, the second direction is 135°±3°, the third direction is -45°±3°, and the fourth direction is -135°±3°.

[0018] By selecting these orientations, it is possible to obtain a metal diaphragm with a partially spherical shell shape that undergoes less deformation.

[0019] (3) In one aspect of the present invention, the metal diaphragm preferably has an identification portion in the first and second directions, or in the third and fourth directions.

[0020] If the blanking part has an identification portion in the first direction and the aforementioned second direction, or in the third direction and the fourth direction, the bending direction can be reliably and easily set when the blanking part is bent. Therefore, a diaphragm with a partially spherical shape without deformation can be reliably and easily obtained.

[0021] (4) In one aspect of the present invention, the metal diaphragm is preferably a cut or a positioning edge.

[0022] When the identification portion is a notch or a positioning edge, if these identification portions are formed in the rolling direction or in a direction perpendicular to the rolling direction, the deformation will be large if a partial spherical shell shape is formed by deep drawing. However, if the notch or positioning edge is formed in any of the aforementioned first to fourth directions, a partial spherical shell shape with less deformation can be obtained by deep drawing.

[0023] (5) In one aspect of the present invention, the metal diaphragm is preferably made of any one of Co-Ni based alloy, stainless steel, Ni-Mo-Cr based alloy, Ni-Cr based alloy, and Ni based alloy.

[0024] Co-Ni based alloys, stainless steel, Ni-Mo-Cr based alloys, Ni-Cr based alloys, and Ni-based alloys are all metals with high elasticity and rolling anisotropy. Metal diaphragms made from these metals can provide highly elastic and responsive diaphragms. Furthermore, these metals also exhibit excellent corrosion resistance, thus providing diaphragms with superior corrosion resistance.

[0025] (6) A method for manufacturing a metal diaphragm according to one aspect of the present invention is characterized in that, during the process of forming a stamped part by stamping a rolled metal sheet having rolling anisotropy, performing a first processing of bending the stamped part symmetrically about a straight line parallel to the rolling direction as a centerline, and then performing a second processing of forming a diaphragm having a partially spherical shape by deep drawing, the method is characterized in that, in the first direction, which is 45°±6° circumferentially in the direction from the rolling direction of the rolled metal sheet, and in the direction of the partially spherical shape, the method is characterized in that, in the first direction, which is 45°±6° circumferentially in the direction from the rolling direction of the rolled metal sheet, the method is characterized in that, in the direction of the first direction, which is 45°±6° circumferentially in the direction from the rolling direction of the rolled metal sheet, the method is characterized in that, in the direction of the first direction, which is circumferentially in the direction of the partially spherical shape, the method is characterized in that, in the direction of the second processing of forming a diaphragm by stamping a rolled metal sheet having rolling anisotropy, the method is characterized in that, in the direction of the first direction, which is circumferentially in the direction from the rolling direction of the rolled metal sheet, the method is characterized in that, in the direction of the second processing of forming a diaphragm having a partially spherical shape ... The aforementioned stamped part is formed by punching the aforementioned rolled metal sheet in at least one of the following directions: the second direction of 135°±6° circumferentially of the aforementioned partial spherical shell shape, the third direction of -45°±6° circumferentially of the aforementioned partial spherical shell shape, and the fourth direction of -135°±6° circumferentially of the aforementioned partial spherical shell shape. Then, the aforementioned primary processing is performed on the aforementioned stamped part with a straight line parallel to the rolling direction identified by the aforementioned identification part as a mark as the bending center line.

[0026] In a method for manufacturing a metal diaphragm composed of a stamped part made of rolled metal sheet with anisotropic rolling properties, if an identification part is provided on any one of the first to fourth directions, the stamped part is bent along the rolling direction, and then a partially spherical shell shape is obtained by deep drawing, the bending process can be performed based on reliably controlling the bending direction, and then the deep drawing process can be performed. By performing deep drawing based on correctly selecting the bending direction, a metal diaphragm with a target partially spherical shell shape can be obtained.

[0027] In contrast, it is not easy to determine the direction when bending a blank without an identification part. If the direction is incorrect during bending, a metal diaphragm with a partial spherical shape that has the target shape cannot be obtained.

[0028] Furthermore, by providing identification parts in the rolling direction or the rolling right-angle direction, the directionality during bending processing can also be controlled. However, if identification parts such as notches or positioning edges are provided in the rolling direction or in a direction perpendicular to the rolling direction, stress is applied to the blanking part during deep drawing, starting from the identification parts such as notches or positioning edges, causing deformation in the partial spherical shell shape. This deformation in the partial spherical shell shape is an undesirable defect for a diaphragm, which is a precision part. Therefore, by providing identification parts in any of the aforementioned first to fourth directions, a diaphragm with a partial spherical shell shape without deformation can be formed.

[0029] (7) In a method for manufacturing a metal diaphragm according to one aspect of the present invention, it is preferred that the first direction is 45°±3° upward in the aforementioned top view circumference, the second direction is 135°±3° upward in the aforementioned top view circumference, the third direction is -45°±3° upward in the aforementioned top view circumference, and the fourth direction is -135°±3° upward in the aforementioned top view circumference.

[0030] (8) In a method for manufacturing a metal diaphragm according to one aspect of the present invention, it is preferable that the identification portion is formed in the first direction and the second direction, or in the third direction and the fourth direction.

[0031] (9) In a method for manufacturing a metal diaphragm according to one aspect of the present invention, it is preferable to form a cut or a positioning edge as the aforementioned identification portion.

[0032] (10) A method for manufacturing a metal diaphragm according to one aspect of the present invention is characterized in that any one of Co-Ni-based alloy, stainless steel, Ni-Mo-Cr-based alloy, Ni-Cr-based alloy, and Ni-based alloy is used as the metal material constituting the aforementioned rolled metal sheet.

[0033] The effects of the invention The metal diaphragm of the present invention has the following configuration: a recognition portion is provided in at least one of the four directions in a stamped part of a rolled metal sheet with rolling anisotropy. Therefore, when a partially spherical shell shape is obtained by bending the stamped part of the rolled metal sheet along the rolling direction and then drawing it, the drawing process can be performed based on bending with the correct orientation. By performing the drawing process based on bending with the correct orientation, without being affected by the recognition portion provided in any of the four directions, a metal diaphragm with a target partially spherical shell shape with minimal deformation can be obtained. Attached Figure Description

[0034] Figure 1 This is a top view showing an example of stamping in the case where a stamped part is cut from a rolled metal sheet to form the basis of the diaphragm involved in the first embodiment.

[0035] Figure 2 This is a top view showing an example of a stamped part.

[0036] Figure 3The figures shown are an example of a method for manufacturing a diaphragm. (a) is a figure showing the relationship between the U-shaped blank and the rolling direction. (b) is a figure showing the relationship between the U-shaped blank and the rolling right-angle direction. (c) is a perspective view showing an example of a fixture used when bending the blank into a U-shape.

[0037] Figure 4 It is a cross-sectional view showing the positional relationship of the die, the round plate, and the rubber plate in the deep drawing process of the punched part that has been bent into a U-shape.

[0038] Figure 5 This is a perspective view showing the diaphragm involved in the first embodiment, as well as its diameter and height.

[0039] Figure 6 This is a perspective view showing the diaphragm according to the second embodiment.

[0040] Figure 7 This is an explanatory diagram showing various directions in which a circular stamped part is housed in a forming fixture in an embodiment, and the angle (filling angle) misaligned relative to a specific direction is set to the negative (-) side.

[0041] Figure 8 This is an explanatory diagram showing various directions in which a circular stamped part is housed in a forming fixture in an embodiment, and the angle (filling angle) of misalignment relative to a specific direction is set to the positive (+) side.

[0042] Figure 9 This is a graph showing the relationship between the filling angle and the secondary molding height when the filling angle is adjusted to the range of -30° to +30° in the embodiments.

[0043] Figure 10 This is a graph showing the relationship between the fill angle and the height ratio when the fill angle is adjusted to the range of -30° to +30° in the embodiments. Detailed Implementation

[0044] Hereinafter, embodiments of the diaphragm according to the present invention will be described with reference to the accompanying drawings. In the following embodiments, as an example of a diaphragm, a dome-shaped diaphragm having a partially spherical shell shape will be described. Furthermore, in the drawings used in the following description, the scale of each component has been appropriately altered and shown in order to make each component a recognizable size.

[0045] [First Implementation] Figure 1A strip-shaped rolled metal sheet 1 is shown, which is composed, for example, of any one of Co-Ni based alloys, stainless steel, Ni-Mo-Cr based alloys, Ni-Cr based alloys, and Ni based alloys. The stainless steel can also be any one of austenitic stainless steel, austenitic / ferritic duplex stainless steel, ferritic stainless steel, martensitic stainless steel, etc. These metallic materials possess high elasticity and excellent corrosion resistance, making them suitable metallic materials for constituting metallic diaphragms.

[0046] The rolled metal sheet 1 is made of any of the aforementioned metal materials, but the rolled metal sheet 1 is processed into a strip shape by rolling, and the rolling direction LD is a direction parallel to the length direction of the rolled metal sheet 1.

[0047] Furthermore, as an example, the rolled metal sheet 1 has a thickness of approximately 0.03 mm to 0.5 mm. Additionally, since the rolled metal sheet 1 is manufactured by rolling the aforementioned metal material, the grains constituting the metal structure of the rolled metal sheet 1 are stretched in the rolling direction. Therefore, if we compare the strength of the rolled metal sheet 1 in the rolling direction with its strength in the rolling perpendicular direction (width direction: TD), the strength in the rolling perpendicular direction is higher. In other words, the strength is higher when the rolled metal sheet 1 is bent with the front and rear ends of the rolling direction as the two ends and a straight line orthogonal to the width direction as the bending line, than when it is symmetrically bent with the center line of the width direction of the rolled metal sheet 1 as the bending line. The rolled metal sheet 1 exhibits the rolling anisotropy as described above.

[0048] Manufacturing method of metal diaphragms By utilizing Figure 1 The rolled metal sheet 1 shown is used to cut along the edge of the sheet. Figure 1 The outline 2 of the circle, shown in solid line, is punched to obtain... Figure 2 The circular plate-shaped blanking part 3 is shown. Then, the blanking part 3 is processed as described later, based on... Figure 3 Perform one processing step, and then based on Figure 4 By performing secondary processing, it is possible to obtain Figure 5 The metal diaphragm 5 shown.

[0049] In the first processing step, the rolling right-angle direction TD is bent significantly to increase its strength. As an example of this first processing step, the method of bending the blank 3 into a U-shape in the rolling right-angle direction TD will be described later. In the second processing step, the blank 3 that has undergone this first processing step is drawn to become a partially spherical shape.

[0050] In the case of punching part 3 from rolled metal sheet 1, such as Figure 2As shown, the diameter of the contour line 2 overlapping with the rolling direction LD is assumed to be the reference line d. The contour line 2 is punched with semi-circular arc-shaped cutouts (identification parts) 3a formed in the +45° direction and the +135° direction in the right-hand direction when viewed from above. In addition, in the following description, the +45° direction in the right-hand direction is simply referred to as the 45° direction, and the +135° direction in the right-hand direction is simply referred to as the 135° direction.

[0051] exist Figure 1 The example shown illustrates an arc-shaped cutout 3a with an inner diameter of approximately 0.5 to 30% relative to the contour line 2.

[0052] Furthermore, the size of the cut 3a is preferably such that the operator handling the metal diaphragm 5 can visually recognize it, but is not limited to the aforementioned range.

[0053] Furthermore, in this example, cutouts 3a are formed in the 45° and 135° directions relative to the baseline d, which serves as the diameter. However, if the right-hand rotation direction is defined as positive (positive direction: + direction) and the left-hand rotation direction is defined as negative (negative direction: - direction) when viewing the outline 2 from above, the cutouts 3a can also be formed in the -45° and -135° directions.

[0054] exist Figure 2 The blanking part 3 shown has cutouts 3a formed in the 45° and -135° directions indicated by solid lines, and the approximate shape of the cutouts 3a formed in the -45° and 135° directions indicated by double-dotted lines. Figure 2 In this context, the cut portion that can be formed in the 45° direction (first direction) is called the first cut portion 3a, the cut portion that can be formed in the 135° direction (second direction) is called the second cut portion 3a, the cut portion that can be formed in the -45° direction (third direction) is called the third cut portion 3a, and the cut portion that can be formed in the -135° direction (fourth direction) is called the fourth cut portion 3a.

[0055] Furthermore, the cut portion 3a formed in the punched part 3 can be formed in one or more of the aforementioned directions: 45°, 135°, -45°, and -135°.

[0056] exist Figure 2 In the figure, at the position where the dotted line a in a direction of 45° relative to the reference line d intersects with the outer periphery of the blanking part 3, a (first) cut portion 3a in the 45° direction is formed; at the position where the dotted line e in a direction of 135° relative to the reference line d intersects with the outer periphery of the blanking part 3, a (second) cut portion 3a in the 135° direction is formed.

[0057] exist Figure 2 In the figure, at the position where the dotted line c, which is in a direction of -45° relative to the reference line d, intersects with the outer periphery of the blanking part 3, a (third) cut portion 3a in the direction of -45° is formed; at the position where the dotted line b, which is in a direction of -135° relative to the reference line d, intersects with the outer periphery of the blanking part 3, a (fourth) cut portion 3a in the direction of -135° is formed.

[0058] When the blanking part 3 forms two cutouts 3a, it is more preferable that the cutouts 3a are formed in adjacent positions in the circumferential direction in the following manner: the cutouts 3a are formed in the 45° direction and the -45° direction, or in the 135° direction and the -135° direction, or in the 45° direction and the 135° direction, or in the -45° direction and the -135° direction.

[0059] By forming the two cutouts 3a in adjacent positions in the circumferential direction, it has the following advantages: even if the blank 3 flips during bending in a single process, the positional relationship between the cutouts 3a and the rolling direction LD and the rolling right-angle direction TD can still be determined.

[0060] When the die-cut part 3 forms a notch 3a, it is preferable that the center of the notch 3 is within ±6° of the aforementioned 45°, 135°, -45°, and -135° directions. Furthermore, when the die-cut part 3 forms a notch 3a, it is more preferable that the center of the notch 3a is within ±3° of the aforementioned 45°, 135°, -45°, and -135° directions.

[0061] For example, when the (first) cut portion 3a is formed in the 45° direction, it is preferable that the (first) cut portion 3a exists in the range of 45°±6°, and more preferably in the range of 45°±3°. When the (second) cut portion 3a is formed in the 135° direction, it is preferable that the (second) cut portion 3a exists in the range of 135°±6°, and more preferably in the range of 135°±3°.

[0062] For example, when the (third) cut portion 3a is formed in the -45° direction, it is preferable that the (third) cut portion 3a exists in the range of -45°±6°, and more preferably in the range of -45°±3°. When the (fourth) cut portion 3a is formed in the -135° direction, it is preferable that the (fourth) cut portion 3a exists in the range of -135°±6°, and more preferably in the range of -135°±3°.

[0063] The definition of a cut portion 3a within the aforementioned angular range is that, when the cut portion 3a is semi-circular, its center lies within the aforementioned angular range. The shape of the cut portion 3a can be rectangular, triangular, slit-like, or any other shape, but regardless of the shape, its center must lie within the aforementioned angular range.

[0064] If the blanked part 3 is obtained, the following processing is performed: taking the baseline d of the blanked part 3 as the bending center line, the blanked part 3 is symmetrically bent into a U-shape. Figure 3 (a) shows the relative relationship between the U-shaped punched part 3 and the reference line d and the rolling direction LD. Figure 3 (b) shows the relative relationship between the U-shaped punched part 3 and the reference line d and the rolling right angle direction TD. In addition, bending into a U-shape is one example, but bending shapes such as V-shapes are also possible. Regarding the bending angle, any angle can be selected to match the material.

[0065] In such Figure 3 When bending the blanking part 3 as shown in (a) and (b), it is possible to use, as shown in (b) Figure 3 (c) A forming jig 6, as illustrated, has an arched (or convex) protrusion 6b at the center of the upper surface of a disc-shaped base 6a for bending. For example, by aligning the ridge line of the protrusion 6b with the reference line d of the blanking part 3, and placing a punch (not shown) with a concave curved surface on the lower surface above the blanking part 3, the correct bending process can be performed by lowering the punch.

[0066] To align the ridge line of the protrusion 6b with the reference line d of the blanking part 3, the outer periphery of the upper surface of the base 6a is drawn in a circle when the notch 3a is set in the 45° and 135° directions. Therefore, markings such as engravings can be provided on the outer periphery of the upper surface of the base 6a in the 45° and 135° directions, respectively, and these markings are aligned with the aforementioned notch 3a. This ensures that the ridge line of the protrusion 6b is correctly aligned with the reference line d of the blanking part 3.

[0067] With the notches 3a positioned in the -45° and -135° directions, the outer periphery of the upper surface of the base 6a is drawn in a circle. Therefore, markings such as engravings can be provided on the outer periphery of the upper surface of the base 6a in the -45° and -135° directions, respectively, aligning these markings with the aforementioned notches 3a. This allows the ridge line of the protrusion 6b to be correctly aligned with the reference line d of the stamped part 3.

[0068] If the cutout 3a is provided only in one of the following directions (45°, 135°, -45°, and -135°), and the position of the mark on the outer periphery of the upper surface of the base 6a is aligned with the cutout 3a, it is preferable to provide the mark on the base 6a in such a way that the reference line d of the blanking part 3 coincides with the edge line of the protrusion 6b.

[0069] If a first-stage processing of bending the stamped part into three sections is performed, a second-stage processing based on deep drawing is then performed.

[0070] In the deep drawing process, when formed in Figure 4 The recess 8 of the holder 7 of the stamping press shown accommodates the bearing member 9 and the rubber plate 10, on which a U-shaped punch 3 is mounted. Above the holder 7 of the stamping press, a rod-shaped punch 11 is provided, which can be inserted into the recess 8. On the lower surface of the punch 11, a concave curved surface 11a in the shape of a spherical shell is formed for processing the target metal diaphragm 5.

[0071] On the upper surface of the supporting component 9, a convex surface 9a is formed for forming the target spherical shell shape. The rubber sheet 10 has a concave surface 10a closely connected to the convex surface 9a on the lower surface side, and a convex surface 10b with a similar shape to the aforementioned convex surface 9a on the upper surface side.

[0072] like Figure 4 As shown, the bent punched part 3 is arranged in an inverted U-shape facing the upper surface of the rubber sheet 10. The punched part 3 is arranged such that the concave surface of the bent punched part 3 faces downward and the convex surface of the punched part 3 faces upward.

[0073] From this position, the punch 11 is inserted from above relative to the recess 8 of the retainer 7, and the concave surface 11a of the punch 11 is used to push the blank 3 against the rubber plate 10 for deep drawing. Through this deep drawing process, the U-shaped blank 3 can be deformed to obtain a shape with… Figure 5 The diagram shows a dome-shaped metal diaphragm 5 in the shape of a spherical shell. The metal diaphragm 5 has a partially spherical shell shape, which has a predetermined diameter D and a predetermined height H.

[0074] The metal diaphragm 5, manufactured as described above, is based on... Figure 3 In the bending process described, the reference line d of the blanking part 3 is correctly aligned with the edge line of the protrusion 6b of the forming fixture 6 to bend it into a U-shape. Moreover, the forming position of the cut part 3a is set in a 45° direction and a 135° direction, which are not the rolling direction LD of the blanking part 3, nor the rolling right angle direction TD, but rather in the middle position between the rolling direction LD and the rolling right angle direction TD.

[0075] As described above, the rolled metal sheet 1, which forms the basis of the stamped part 3, is formed from a metallic material with rolling anisotropy, and the metallic material forming the rolled metal sheet 1 has a shape in which its grains are stretched in the rolling direction. In the stamped part 3 cut from such a rolled metal sheet 1, assuming a notch 3a exists in the rolling direction LD or the rolling right-angle direction TD, due to the aforementioned rolling anisotropy, during the process... Figure 4 In the deep drawing process shown, the resulting metal diaphragm 5 deforms, and the desired spherical shape cannot be obtained.

[0076] In contrast, if the notch 3a is provided in the 45° and 135° directions, which are not the rolling direction LD or the rolling right-angle direction TD, but rather in the intermediate position, the deformation of the metal diaphragm can be minimized. As a result, a metal diaphragm 5 with less deformation can be manufactured. The metal diaphragm 5 with less deformation maintains... Figure 5 When placed on a flat surface such as a table in the state shown, it can be stably installed without shaking. That is, due to minimal deformation, the bottom periphery of the metal diaphragm 5 has a small height difference, allowing the metal diaphragm 5 to be placed on a flat surface without shaking.

[0077] Furthermore, by suppressing the deviation in the formation position of the cut portion 3a formed in the punched part 3, it is possible to obtain a metal diaphragm that suppresses the deviation in the secondary forming height after deep drawing.

[0078] For example, if the forming position of the cut portion 3a formed in the punched part 3 is within the range of 45°±6°, 135°±6°, -45°±6°, or -135°±6°, then the displacement of the height H of the metal diaphragm 5 after deep drawing can be reduced to within 15%.

[0079] Furthermore, if the forming position of the cut portion 3a in the stamped part 3 is within any range of 45°±3°, 135°±3°, -45°±3°, or -135°±3°, the displacement of the height H of the metal diaphragm 5 after deep drawing can be reduced to within 8%.

[0080] Based on Figures 1 to 5 In the described embodiment, a cutout 3a is used as an example of the identification part, but the identification part can also be a positioning edge or an identification mark such as printing. In the case of a positioning edge, it is sufficient that the center position of the positioning edge in the width direction falls within the aforementioned angle range.

[0081] [Second Implementation] Figure 6 The metal diaphragm 15 of the second embodiment of the present invention is shown.

[0082] The metal diaphragm 15 of this example has: a rounded top 15a having a partially spherical shape; and an annular flange 15b formed on the outer periphery of the rounded top 15a.

[0083] In the metal diaphragm 15 of the second embodiment, cutouts 15c, 15c are formed on the outer periphery of the flange portion 15b.

[0084] If, when viewing the metal diaphragm 15 from above, the diameter of the metal diaphragm 15 aligned with the rolling direction LD is taken as the baseline, and the right-hand rotation direction is defined as the "+" direction and the left-hand rotation direction as the "-" direction, then the position where the cut portion 15c is formed is in the same direction as in the previous embodiment. For example, in the flange portion 15b viewed from above, one or more of the four directions—45°, 135°, -45°, and -135°—can be used.

[0085] In the case of a combination of two directions, it is preferable to form the cut portion 15c in the 45° direction and the -45° direction, and even more preferably, the cut portion 15c is formed in the 135° direction and the -135° direction. Figure 6 The metal diaphragm 15 shown is an example in which cutouts 15c are formed in the -135° and 135° directions.

[0086] In the case of manufacturing the metal diaphragm 15 of the second embodiment, and from... Figure 1 Similarly, in the case where the rolled metal sheet 1 is punched to produce the punched part 3, a wide punched part including a flange portion 15b is punched from the rolled metal sheet 1. For this punched part, compared with the case based on... Figure 3 Similarly, the described situation includes bending the flange into a U-shape to accommodate the bent, flanged stamped part in a... Figure 4 The recess of the press has a similar structure to the one shown.

[0087] If, in this case, the recess of the press is provided with a bearing member and a rubber plate having a flat, annular end on the outer periphery corresponding to the width of the flange, the press can be pressed using a punch having a flat, annular end on the outer periphery corresponding to the width of the flange.

[0088] In the second embodiment, the metal diaphragm 15 can also be correctly bent into a U-shape in one processing step by using the cut-out portions 15c, 15c. By using a flanged stamped part from a rolled metal sheet 1 with rolling anisotropy, a metal diaphragm 15 with a target spherical shell shape with less variation in height ratio in the circumferential direction and less deformation can also be obtained through a deep drawing process in the second processing step.

[0089] The metal diaphragm 15 with minimal deformation maintains Figure 6 When placed on a flat surface such as a table in the state shown, it can be stably installed without shaking. That is, due to minimal deformation, the bottom surface of the flange 15b of the metal diaphragm 15 has a small height difference, allowing the metal diaphragm 15 to be placed on a flat surface without shaking. Example

[0090] A metal disc (stamped part) with an outer diameter of 26 mm is punched from a rolled metal sheet (thickness: 0.2 mm) made of a Co-Ni based alloy (Seiko Instruments Co., Ltd. trade name SPRON510 (SPRON: registered trademark)). In the case of punching the metal disc, the right-hand direction (+ direction) viewed from above is defined as the rolling direction (reference line) relative to the surface of the rolled metal sheet, and the left-hand direction viewed from above is defined as the - direction. A metal disc with a flange is punched out by having notches in the 135° and -135° directions relative to the reference line. The outer diameter of the flange is 26 mm, and the inner diameter of the flange is 24 mm. Furthermore, the notches are formed as arcs with a radius of 1 mm centered at a position 13.7 mm away from the center of the metal disc in the view from above.

[0091] The punched metal round plate has cuts in the 135° and -135° directions relative to the reference line, so that the reference line (rolling direction) can be correctly defined for each of the punched metal round plates.

[0092] Next, the metal disc is bent into a U-shape in a single process. During the bending process, the following method is used: Figure 3 (c) shows a forming jig 6 with a protrusion 6b on a base 6a. The edge of the protrusion 6b is correctly aligned with the reference line, and a one-time process is performed to bend the metal disc into a U-shape. Through this one-time process, the metal disc can be symmetrically bent into a U-shape with the reference line consistent with the rolling direction of the metal disc as the bending center line.

[0093] Next, the U-shaped metal disc is placed in a position that... Figure 4 The press for the retainer 7 shown. Specifically, a bearing member 9 and a rubber plate 10 are accommodated in the recess 8 formed in the retainer 7, and a U-shaped metal disc (stamped part) 3 is placed on the rubber plate 10. The metal disc is arranged with the protruding side facing upward and the recessed side facing downward.

[0094] A rod-shaped punch 11, capable of being inserted into the recess 8, is used to perform a secondary processing step of deep drawing on the U-shaped metal disc, producing a partially spherical shape. Figure 6 A diaphragm with a flange in the shape shown.

[0095] To investigate the influence of the formation location of the cut on primary and secondary processing, the effect after secondary processing was studied by changing the angle between the ridge line of the protrusion 6b and the reference line (bending center line) of the metal disc during primary processing.

[0096] The forming fixture 6 for one-time processing is used and equipped with Figure 4 A stamping press of the same shape as the holder 7 of the recess 8 shown is used to perform a bending process in one operation by placing a forming jig 6 on the recess 8. In this case, the angle can be easily changed by changing the orientation of the metal disc relative to the recess 8 of the forming jig 6.

[0097] In the following description, when bending is performed by placing the forming fixture 6 in the recess of the stamping machine, the filling angle of the metal disc relative to the forming fixture is changed as shown in Table 1 below. This changes the angle between the edge of the protrusion 6b in one pass and the rolling direction (reference line) of the metal disc, and a bending test is conducted. In Table 1 below, the angle between the filling direction of the metal disc and the rolling direction (reference line) of the metal disc is denoted as the filling angle.

[0098] The secondary forming height was measured for each metal diaphragm manufactured with a changed filling angle. The secondary forming height was measured as the height of the metal disc comprising the metal diaphragm with a thickness of 0.1 mm, and is shown in Table 1 below.

[0099] exist Figure 7 The diagram shows the relationship between the directions when the fill angle is set to negative (-). Figure 8 The diagram shows the relationship between the directions when the fill angle is set to positive (+).

[0100] Figure 7 The following situation is illustrated: In a top-view observation of the metal disc, the 0° direction is considered the standard forming jig filling direction, which becomes the rolling direction of the metal disc (in... Figure 7 The metal disc is filled and placed in the recess of the forming fixture by rotating a predetermined angle in the negative direction (left-handed direction) of the MD rolling direction. The resulting metal diaphragm is observed from above, and its height (mm) is determined with the +45° direction as the measurement direction (+) and the -45° direction as the measurement direction (-).

[0101] Figure 8 The following situation is illustrated: In a top-view observation of the metal disc, the 0° direction is considered the standard forming jig filling direction, which becomes the rolling direction of the metal disc (in... Figure 8The metal disc is filled and placed in the recess of the forming fixture by rotating a predetermined angle in the positive direction (right-hand direction) as shown in the MD rolling direction. The resulting metal diaphragm is observed from above, and its height (mm) is determined with the +45° direction as the measurement direction (+) and the -45° direction as the measurement direction (-).

[0102] exist Figure 7 The case shown is a negative fill angle and Figure 8 If the fill angle shown is positive, select any one of the fill angles: -30°, -20°, -10°, -6°, -3°, 0°, +3°, +6°, +10°, +20°, or +30°.

[0103] The shape difference can be determined by finding the height in the measurement direction (-) of the obtained metal diaphragm, finding the height in the measurement direction (+) of the obtained diaphragm, and calculating their ratio (measurement direction (-) / measurement direction (+)).

[0104] The results above are recorded in Table 1 below.

[0105] [Table 1] Furthermore, regarding the results obtained as shown in Table 1, in Figure 9 The diagram shows the relationship between the filling angle (°) and the secondary molding height. Figure 10 The diagram shows the relationship between the fill angle and the height ratio.

[0106] From Table 1 and Figure 9 , Figure 10 The results show that for a metal round plate with a flange and a notch in a ±135° direction relative to the rolling direction (reference line) from the rolling sheet, it is possible to draw the metal diaphragm with good accuracy after a second processing step, while bending it in one processing step, in accordance with its direction.

[0107] As shown in Table 1, Figure 9 As shown, it can be seen that by adjusting the angle difference between the reference line showing the rolling direction of the metal disc and the bending center line during the first forming, so that the filling angle is within the range of 0±6°, the deviation of the secondary forming height can be reduced. Furthermore, it can be seen that if the filling angle is within the range of 0±3°, the deviation of the secondary forming height can be minimized.

[0108] As shown in Table 1, Figure 10As shown, if the angle difference between the reference line showing the rolling direction of the metal disc and the bending center line during one-time forming is adjusted to a range of 0±6° for the filling angle, the deviation in the height ratio of the metal diaphragm can be reduced to within 15%. Furthermore, it is shown that if the aforementioned angle difference is adjusted to a range of 0±3° for the filling angle, the deviation in the height ratio of the metal diaphragm can be reduced to within 8%.

[0109] Furthermore, a metal diaphragm with a flange, manufactured with a filling angle in the range of 0±6°, will not wobble when pressed with a finger on a flat surface such as a table with the flange facing downwards. In contrast, a diaphragm manufactured with a filling angle in the range of 0±10°, 0±20°, or 0±30° will wobble noticeably when pressed with a finger on a flat surface such as a table with the flange facing downwards.

[0110] Explanation of reference numerals in the attached figures 1……Rolled metal sheet, 2……Outline, 3……Stamped part, 3a……Slit (identification part), 5……Metal diaphragm, 7……Retainer, 8……Recess, 9……Bearing component, 10……Rubber sheet, 11……Punch, 15……Diaphragm, 15a……Double top, 15b……Flange, 15c……Slit, d……Base line, H……Height, D……Diameter, LD……Rolling direction, TD……Rolling right angle direction.

Claims

1. A metal diaphragm, comprising a stamped part of a rolled metal sheet with anisotropic rolling properties, having a partially spherical shape, characterized in that, The identification portion is provided in at least one of the following directions: a first direction at 45°±6° from the rolling direction of the rolled metal sheet, a second direction at 135°±6° from the rolling direction of the partial spherical shell shape, a third direction at -45°±6° from the rolling direction of the partial spherical shell shape, and a fourth direction at -135°±6° from the rolling direction of the partial spherical shell shape.

2. The metal diaphragm according to claim 1, characterized in that, The first direction is 45°±3° upward from the top-view circumference, the second direction is 135°±3° upward from the top-view circumference, the third direction is -45°±3° upward from the top-view circumference, and the fourth direction is -135°±3° upward from the top-view circumference.

3. The metal diaphragm according to claim 1 or claim 2, characterized in that, The identification part is provided in the first direction and the second direction, or in the third direction and the fourth direction.

4. The metal diaphragm according to claim 1 or claim 2, characterized in that, The identification part is a cutout or a positioning edge.

5. The metal diaphragm according to claim 1 or claim 2, characterized in that, The rolled metal sheet is composed of any one of Co-Ni based alloy, stainless steel, Ni-Mo-Cr based alloy, Ni-Cr based alloy, and Ni based alloy.

6. A method for manufacturing a metal diaphragm, characterized in that, In the process of forming a stamped part by stamping a rolled metal sheet with anisotropic rolling properties, performing a primary processing of bending the stamped part symmetrically with a straight line parallel to the rolling direction as the center line, and then performing a secondary processing of forming a metal diaphragm with a partially spherical shape by deep drawing, the process involves... The stamped part is formed by punching the rolled metal sheet in at least one of the following directions: a first direction having an identification portion at 45°±6° upward from the rolling direction of the rolled metal sheet; a second direction having an identification portion at 135°±6° upward from the rolling direction of the rolled metal sheet; a third direction having an identification portion at -45°±6° upward from the rolling direction of the rolled metal sheet; and a fourth direction having an identification portion at -135°±6° upward from the rolling direction of the rolled metal sheet. The blanking part is subjected to the first processing using a straight line parallel to the rolling direction identified by the identification part as a mark as the bending center line.

7. The method for manufacturing a metal diaphragm according to claim 6, characterized in that, The first direction is 45°±3° upward from the top-view circumference, the second direction is 135°±3° upward from the top-view circumference, the third direction is -45°±3° upward from the top-view circumference, and the fourth direction is -135°±3° upward from the top-view circumference.

8. The method for manufacturing a metal diaphragm according to claim 6 or claim 7, characterized in that, An identification portion is formed in the first direction and the second direction, or in the third direction and the fourth direction.

9. The method for manufacturing a metal diaphragm according to claim 6 or claim 7, characterized in that, As the identification part, a cutout or positioning edge is formed.

10. The method for manufacturing a metal diaphragm according to claim 6 or claim 7, characterized in that, The metal material constituting the rolled metal sheet is any one of Co-Ni based alloy, stainless steel, Ni-Mo-Cr based alloy, Ni-Cr based alloy, and Ni based alloy.

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