JP5643519B2 - Method for manufacturing coated corrugated metal gasket and coated corrugated metal gasket - Google Patents

Description

The present invention relates to a method for producing a coated corrugated metal gasket and a coated corrugated metal gasket excellent in sealing performance in which a coating material is bonded to both surfaces of a corrugated metal plate.

  The coated corrugated metal gasket is used for sealing a fluid at a connection point of equipment and piping such as a heat exchanger in an oil refinery / petrochemical plant, a power plant, a steelworks, and the like.

  Conventionally, sheet gaskets made of asbestos and rubber have been used extensively for the above purposes, but the use of asbestos will be prohibited, and as gaskets that can be used in piping and equipment under the same design conditions as before. Coated corrugated metal gaskets have gained attention.

  Japanese Patent Application Laid-Open No. 2008-45608 discloses a three-layer structure including a core layer made of a metal plate formed in a concentric or substantially concentric corrugated shape, and a surface layer made of expanded graphite laminated on both the front and back surfaces. The core layer protrudes to the outer diameter side from the front and back surface layers at the outer peripheral end of the seal portion, and the front and back surfaces at the inner peripheral end of the seal portion. A non-asbestos gasket (covered corrugated metal gasket) is disclosed in which a layer protrudes toward the inner diameter side of the core layer and covers the core layer. In such a corrugated metal gasket, the coating material on the surface absorbs distortion and roughness of the flange surface, and when tightened, a high surface pressure is generated in the wave portion and the rebound resilience of the metal is taken into account. High temperature fluid can be sealed even at low clamping pressure.

  Furthermore, in addition to the normal ring shape, products having an elliptical shape, a frame shape, or a shape in which a bolt hole is formed in the gasket can be manufactured.

JP 2008-45608 A

However, in recent years, the use of this coated corrugated metal gasket has expanded, and when it is used at various conditions, particularly at a fastening surface pressure lower than 34.3 N / mm ^{2 of the} asbestos joint sheet, Depending on the shape, the problem of fluid leakage has arisen.

Accordingly, an object of the present invention is to provide a coated corrugated metal gasket having a good sealing property even at a low clamping surface pressure such as 19.6 N / mm ² .

As a result of intensive investigations in such a situation, the present inventors have found that the thickness of the metal plate as the core member, the height of the corrugated shape (the apparent thickness after the metal plate corrugation processing) in the shape of the coated corrugated metal gasket. In other words, if the thickness of the covering material and the density of the covering material are in a specific range, even if the tightening surface pressure is as low as 19.6 N / mm ² , it is found that the sealing performance is good. The invention has been completed.

That is, according to the present invention, a coating material is bonded to both surfaces of a corrugated metal plate that has been corrugated on both sides, and one surface of the metal plate has two or more corrugations, and the other surface has 1 In the method for manufacturing a coated corrugated metal gasket in which corrugations of peaks or more are respectively processed, the corrugation processing is a corrugated mold, which is a combination of arc-shaped molds of 180 degrees or less, or 180 degrees or less. This is a combination of an arc-shaped mold and a linear mold, and the wave shape is pressed with an arc-shaped mold of 180 degrees or less, and then the wave-form end and the newly-processed wave It is a manufacturing method of the covering corrugated metal gasket characterized by pressing and processing so that a shape tip part may wrap.
In the present invention, a covering material is bonded to both sides of a corrugated metal plate that has been corrugated on both sides. One side of the metal plate has two or more peaks, and the other side is 1 It is a coated corrugated metal gasket characterized in that the corrugations of peaks or more are processed and satisfy the following conditions (1) to (6) .
(1) The thickness (t ₀ ) of the metal plate is 0.4 to 1.2 mm,
(2) The difference (t ₁ -t ₀ ) between the height (t ₁ ) of the waveform and the thickness (t ₀ ) of the metal plate is 0.2 mm or more,
(3) Thickness of the coating material _{(t 2)} is 0.15～1.2Mm,
(4) The density of the coating material is 0.7 to 1.35 g / cm ³ ,
(5) The shape of the entire gasket is a combination of arc shapes of 180 degrees or less, or a combination of an arc shape of 180 degrees or less and a linear shape ,
(6) A wrap portion is provided at the end portion of the wave shape processed first and the start end portion of the wave shape processed next, and the waveform is continuous without interruption.

According to the method for producing a coated corrugated metal gasket and the coated corrugated metal gasket according to the present invention, even if the clamping surface pressure is as low as 19.6 N / mm ² , the sealing performance is good.

It is a top view of the covering corrugated metal gasket in this Embodiment. It is the end elevation seen along the XX line of FIG. It is an enlarged view of the metal plate of the covering corrugated metal gasket of FIG. It is a top view of the covering corrugated metal gasket in a reference form . It is a top view of the covering corrugated metal gasket in other reference forms . It is a top view of the covering corrugated metal gasket in other embodiments. It is a top view of the covering corrugated metal gasket in other embodiments.

  The coated corrugated metal gasket 10 of this example is formed by laminating a coating material 2 on both surfaces of a corrugated and circular metal plate (core member) 1 having corrugated surfaces on both surfaces 111 and 112. . The metal plate 1 used in the coated corrugated metal gasket 10 of this example is completely covered with the coating material 2, and there is no protrusion of the metal plate 1 on both the inner diameter side 21 and the outer diameter side 22. That is, the coating material 2 projects from the metal plate 1 toward the center of the gasket 10 on the inner diameter side 21, and the coating material 2 projects outside the metal plate 1 from the outer diameter side 22. For this reason, when attaching a gasket to a flange or at the time of handling, it is excellent in safety without cutting a hand at the edge of a metal plate. Such a coated corrugated metal gasket 10 includes a three-layer structure portion in which the metal plate 1 is sandwiched between the covering materials 2, and a two-layer structure portion in which two covering materials 2 overlap each other on both sides.

  Concentric wave processing is performed on both surfaces 111 and 112 of the metal plate 1 used in the coated corrugated metal gasket 10 (see FIG. 3). That is, the metal plate 1 has a shape in which a waveform appears on a cut surface (cut surface in FIG. 3) cut along the radial direction of the metal plate 1. In this example, three peaks 13 a to 13 c are formed on one side 111, and two peaks 13 d and 13 e are formed on the other side 112. The coated corrugated metal gasket 10 of the present invention is only required to have a wave shape satisfying the above (1) and (2). For example, the corrugated pitch does not have to be an equal pitch. The amplitude and pitch are the same. As the gasket ring width Y increases, the number of waves increases accordingly.

In the coated corrugated metal gasket 10, the thickness (t ₀ ) of the metal plate 1 is the thickness of the wave-processed metal plate 1 itself, and refers to the dimension corresponding to the symbol t ₀ in FIG. The thickness of the metal plate 1 is substantially the same regardless of where the wave-processed metal plate 1 is taken. In the present invention, the thickness (t ₀ ) of the metal plate 1 is 0.4 to 1.2 mm. Is less than the metal plate 1 having a thickness (t ₀₎ is 0.4 mm, when tightened to a predetermined tightening face pressure, metal will be repulsive elasticity lost by plastic deformation, the metal plate 1 having a thickness in the reverse (t ₀ ) Exceeding 1.2 mm, the required amount of deformation cannot be secured when tightened with a predetermined tightening surface pressure.

In the coated corrugated metal gasket 10, the height of the corrugation is the distance in the thickness direction between the peak 13a on one side 111 of the corrugated metal plate 1 and the peak 13d on the other side 112, ie, the metal It refers to the apparent thickness of the metal plate including the corrugations, not the thickness of the plate 1 itself, and refers to the dimension of the portion corresponding to the symbol t ₁ in FIG. The height (t ₁ ) of the waveform is the same regardless of which mountain and which valley in FIG. In FIG. 3, “valley” refers to 13d and 13e that are peaks on the other side 112.

In the present invention, the difference (t ₁ −t ₀ ) between the height (t ₁ ) of the waveform and the thickness (t ₀ ) of the metal plate is 0.2 mm or more. When (t ₁ -t ₀ ) is less than 0.2 mm, the R (R) of the wave crest and trough of the metal plate 1 becomes large, and a load necessary for the seal cannot be applied. The upper limit of (t ₁ -t ₀ ) is approximately 1.6 mm. If the (t ₁ -t ₀ ) value is too large, the metal thickness of the wave portion becomes thin due to excessive deformation, which is not preferable in that it cannot withstand the tightening surface pressure.

  In the coated corrugated metal gasket 10, the material of the metal plate 1 serving as the core member is appropriately selected depending on the type of fluid, temperature, and the like. For example, a stainless steel plate such as SUS316L, SUS316, or SUS304 is preferably used.

  Examples of the material of the coating material used in the coated corrugated metal gasket 10 include expanded graphite, polytetrafluoroethylene (PTFE), mica, ceramic, elastomer, and metal foil. Among these, expanded graphite is preferable in that the effects of the present invention can be remarkably exhibited.

Layer material 2 having a thickness _{(t 2)} is 0.15～1.2Mm. The thickness (t ₂ ) of the covering material 2 refers to the thickness (t ₂ ) of the covering material 2 in the portion covering the metal plate 1 (the Y portion in FIG. ₂ ). The thickness of the covering material 2 is substantially the same regardless of the location of the corrugated covering material 2 in the portion covering the metal plate 1. When the thickness (t ₂ ) of the covering material 2 exceeds 1.2 mm, the influence of the surface pressure concentration due to the wave crest of the metal plate 1 is alleviated, and the sealing performance is deteriorated. Moreover, the rebound resilience of the metal plate 1 is also killed. When the thickness (t ₂ ) of the covering material 2 is less than 0.15 mm, it becomes impossible to absorb the distortion and roughness of the flange surface.

The density of the covering material 2 is 0.7 to 1.35 g / cm ³ . When the density of the covering material 2 is less than 0.7 g / cm ³ , leakage easily occurs from the covering material 2 portion, and the sealing performance is deteriorated. Moreover, when the density of the coating | covering material 2 exceeds 1.35 g / cm < ³ >, a coating | coated material will become hard too much and it is unpreferable at the point that cushioning properties are hard to express.

In the coated corrugated metal gasket of the present invention, one surface of the metal plate has two or more undulations, and the other surface has one or more undulations. That is, in the case of this example shown in FIG. 2 and FIG. 3, one surface 111 of the metal plate has three peak waveforms, and the other surface 112 has two peak waveforms (three valley waveforms). However, the present invention is not limited to this, and one surface 111 of the metal plate is processed by corrugation of four peaks, and the other surface 112 is processed by corrugation of three peaks. The surface 111 of the metal plate has five corrugations, the other surface 112 has four corrugations, and one surface 111 of the metal plate has six corrugations and the other surface 112 has five corrugations. The one obtained by processing the corrugations of the mountains, the one surface 111 of the metal plate having seven corrugations, the other surface 112 by processing six corrugations, and the like can be used. These are appropriately determined depending on the size of the coated corrugated metal gasket. When one surface of the metal plate has a single corrugation and the other surface has no corrugation, the effect of concentrating the surface pressure due to the corrugation of the corrugation is lost, and a low tightening surface pressure such as 19.6 N / mm ² is obtained. However, good sealing performance cannot be exhibited.

  When the coated corrugated metal gasket is large, the wave interval may be widened to reduce the contact surface and partially increase the surface pressure. In this case, the waveform of the peak of one surface 111 and the waveform of the peak of the other surface 112 adjacent thereto (the valley as viewed from the one surface 111) are not smoothly continuous like a sine curve. A flat part exists between the mountain and the valley.

  Since the metal plate 1 of the coated corrugated metal gasket of the present invention may be composed of a plurality of divided bodies, the yield of the metal material can be increased, and a large-diameter coated corrugated metal gasket can also be produced. It becomes possible. The divided bodies of the metal plate 1 are joined together by welding and used as an integrated object. The plurality of divided bodies of the metal plate 1 are generally those in which the cutting line is in the radial direction, but are not limited thereto. Similarly, the covering material may be manufactured in a plurality of divided bodies. As the plurality of divided bodies of the covering material, the one in which the cutting line is in the radial direction is common like the metal plate 1, but is not limited thereto. The number of divisions may be appropriately determined as two or more.

The coated corrugated metal gasket 10 is a circular gasket, but is not limited thereto, and for example, a track shape (FIG. 6), a material whose arc curvature changes (FIG. 7), or the like can be used. The semicircular shape (FIG. 4) and the frame shape (FIG. 5) show reference examples. In the case of a semicircular shape, for example, at the boundary portion 41 indicated by the AA line, the waveform direction changes to a perpendicular direction, but the waves are continuous without interruption. In the case of a frame shape, for example, in the boundary portion 51 indicated by the line BB, the waveform direction changes to a right angle direction, but the waves are continuous without interruption. Moreover, it is good also as a whole surface type gasket by making a bolt hole in a covering corrugated metal gasket.

  Next, a method for using the coated corrugated metal gasket 10 will be described. The coated corrugated metal gasket 10 is used to seal a fluid by being mounted between pipe connection locations, that is, between opposed seal surfaces, in an oil refinery, a petrochemical plant, a power plant, a steel mill, and the like. The coated corrugated metal gasket 10 prevents the fluid flowing in the flow path 12 from leaking to the non-fluid side after being mounted between the flanges.

The coated corrugated metal gasket 10 of the present invention has an extremely excellent sealing property that the leakage amount is almost zero with respect to an internal pressure of 2 MPa when used at a clamping surface pressure of 19.6 N / mm ² between the sealing surface and the pressure receiving surface 11. Demonstrate.

  Next, the manufacturing method of the covering corrugated metal gasket of the present invention will be described. The coated corrugated metal gasket is manufactured by performing processes such as a metal plate cutting process, a metal plate wave machining process, an adhesive application process, a coating material cutting process, and a coating material bonding process. In addition, the process of adhere | attaching a coating | covering material to a wave-processed metal plate with an adhesive tape may be implemented, omitting the application | coating process of an adhesive agent. In other words, the above manufacturing method may include a step of forming an adhesive layer between the metal plate and the covering material.

  In the cutting process of a metal plate, a metal plate having a thickness of 0.4 to 1.2 mm is used and cut. Examples of the method for cutting the metal plate include laser processing, punching by press, circle shear, vibro cutter, cutting by wire discharge, and the like.

In the wave processing step of the metal plate, the wave processing may be performed by pressing using a predetermined corrugated mold. As a press used for pressing, a pressing method using a hydraulic, mechanical, vibratory, hammer type or the like can be applied.

  The metal mold | die used by wave processing can use a wave-shaped metal mold | die, the circular arc-shaped metal mold | die of 180 degrees or less, and a linear-shaped metal mold | die individually or in combination. The arc-shaped mold and the linear mold of 180 degrees or less are processed by pressing twice or more. The linear mold is used when corrugating the linear portion of the frame-shaped gasket. In the case of an arc-shaped mold of 180 degrees or less, first, one crest (wave shape) is formed by one press. Next, the second press working is performed so that the previously processed wave-shaped end portion and the newly added wave-shaped start end portion have a lap portion of 0.5 to 3.0 mm. As a result, the seam finishes beautifully.

  In the adhesive application step, examples of the adhesive application method include application methods such as a spray method, a brush, a brush, a hand roller, and a dispenser. The adhesive may be applied to the metal plate, may be applied to the covering material, or both may be applied.

In the cutting process of the covering material, the covering material has a thickness of 0.15 to 1.2 mm and a density of 0.7 to 1.35 g / cm ³ and is cut. That is, the thickness and density of the covering material hardly change even after the cutting process of the covering material and the bonding process of the covering material. As the cutting means, a cutting method such as a Thomson blade, a gasket cutter, or a circle shear can be used.

  In the covering material bonding step, the covering material cut into a predetermined shape from both sides is bonded to the wave-processed metal plate. Thereby, a coating | covering material becomes a shape similar to the metal plate shape wave-processed in the three-layer structure part. The protruding portions of the inner diameter side 21 and the outer diameter side 22 bond the covering materials together. In addition, it may replace with the application | coating process of an adhesive agent, and may take the method of adhere | attaching a coating | covering material on a metal plate using an adhesive tape.

EXAMPLES Next, the present invention will be described more specifically with reference to examples. However, this is merely an example and does not limit the present invention.

A flat metal plate of SUS316L having a thickness of 0.8 mm was cut by laser processing to produce a circular plate with an inner diameter of 63 mm and an outer diameter of 102 mm (metal plate cutting step). Next, a concentric wave shape having six crests on one side surface and five crests on the other side surface was applied to the cut disc-shaped metal plate by pressing (metal plate). Wave processing step). The corrugated metal plate had a (t ₁ -t ₀ ) of 0.2 mm and a corrugated pitch of 3.2 mm. The thickness of the metal plate after machining (t ₀₎ was the same as the thickness before processing.

As a coating material, an expanded graphite sheet having a thickness of 0.38 mm and a density of 1.1 g / cm ³ was cut into two perforated circular sheets having an inner diameter of 61 mm and an outer diameter of 104 mm using a Thomson blade (coating material cutting step) ). Next, an adhesive (“Spray glue 77” (manufactured by Sumitomo 3M)) was applied to both surfaces of the metal plate by a spray method to form an adhesive layer (adhesive application step). Next, the cut corrugated metal is bonded to the one side of the wave-processed metal plate, and the cut metal is further bonded to the other side of the wave-processed metal plate. A gasket was produced (coating material bonding step). The thickness and density of the coating material after the coating material bonding step were 0.38 mm and 1.1 g / cm ³ , which were the same as before cutting and bonding processing. The obtained coated corrugated metal gasket was compliant with an inner diameter of 61 mm, an outer diameter of 104 mm, and JPI 150LB 2B, and the following seal test was performed to evaluate the sealing performance.

(Seal test)
Seal test, JPI Standard flange class 150-RF-2B (material; SUS304) with a clamping surface pressure ^{19.6N / mm 2, 29.4N / mm} 2, and 3 points 39.2 N / mm ^2, The amount of leakage for 10 minutes when nitrogen gas was loaded at an internal pressure of 2.0 MPa was measured. In addition, about Examples 1-4 and Comparative Examples 1-4, the seal test with the clamping surface pressure of 39.2 N / mm ² was omitted. The results are shown in Table 1.

Examples 2 to 4 and Comparative Examples 1 to 4
(T ₁ -t ₀ ) Instead of 0.2 mm, (t ₁ -t ₀ ) is 0.30 mm (Example 2), 0.40 mm (Example 3), 0.50 mm (Example 4), 0 Coated corrugated metal in the same manner as in Example 1 except that the thickness was 0.000 mm (Comparative Example 1), 0.05 mm (Comparative Example 2), 0.10 mm (Comparative Example 3), or 0.15 mm (Comparative Example 4). A gasket was prepared and a seal test was performed. The results are shown in Table 1. Note that changing the (t 1 _{-t 0)} is a change in the waveform height was carried out by changing the mold shape in the wave processing step of the metal plate.

Examples 5 to 8 and Comparative Examples 5 and 6
Instead of the thickness of the flat metal plate 0.8 mm, the thickness 0.4 mm (Example 5), the thickness 0.6 mm (Example 6), the thickness 1.0 mm (Example 7), and the thickness 1.2 mm (Example) 8) A coated corrugated metal gasket was prepared in the same manner as in Example 3 except that the thickness was 0.1 mm (Comparative Example 5) and 1.5 mm (Comparative Example 6), and a seal test was performed. In addition, the coated corrugated metal gaskets of Examples 5 to 8 and Comparative Examples 5 and 6 have a (t ₁ -t ₀ ) of 0.4 mm, a coating material thickness (t ₂ ) of 0.38 mm, and the coating material density. It was 1.1 g / cm ³ . The results are shown in Table 2.

Example 9 and Comparative Examples 7 and 8
Instead of a concentric corrugated shape with six peaks on one side and five peaks on the other side, it is a concentric corrugated shape with two peaks on one side and one mountain on the other side. (Embodiment 9) No peaks on both sides (Comparative Example 7), Concentric wave shape with one crest on one side and one crest on the other side (Comparative Example 8) Except for the above, a coated corrugated metal gasket was produced in the same manner as in Example 3, and a seal test was conducted. The coated corrugated metal gaskets of Example 9 and Comparative Examples 7 and 8 have a (t ₀ ) of 0.8 mm, (t ₁ -t ₀ ) of 0.4 mm, a corrugated pitch of 3.2 mm, The thickness (t ₂ ) was 0.38 mm, and the density of the coating material was 1.1 g / cm ³ . The results are shown in Table 3. In both Example 9 and Comparative Example 8, the waveform portion (reference numeral Z in FIG. 3) was formed at the center in the width direction (length in the left-right direction in FIG. 3). For this reason, in Example 9 and Comparative Example 8, the area occupied by the flat portion 113 is larger than that in Example 3.

Examples 10 to 13 and Comparative Example 9
Instead of the coating thickness of 0.38 mm, the thickness is 0.15 mm (Example 10), the thickness is 0.25 mm (Example 11), the thickness is 0.75 mm (Example 12), and the thickness is 1.20 mm (Example 13). A coated corrugated metal gasket was produced in the same manner as in Example 3 except that the thickness was 1.5 mm (Comparative Example 9), and a seal test was performed. In addition, the coated corrugated metal gaskets of Examples 10 to 13 and Comparative Example 9 have a (t ₀ ) of 0.8 mm, a (t ₁ -t ₀ ) of 0.4 mm, a corrugated pitch of 3.2 mm, The density was 1.1 g / cm ³ . The results are shown in Table 4.

Examples 14 to 16 and Comparative Examples 10 and 11
Instead of the density of the coating material 1.1 g / cm ³ , 0.7 g / cm ³ (Example 14), 1.0 g / cm ³ (Example 15), 1.35 g / cm ³ (Example 16), A coated corrugated metal gasket was produced in the same manner as in Example 3 except that 0.50 g / cm ³ (Comparative Example 10) and 1.65 g / cm ³ (Comparative Example 11) were used, and a seal test was performed. The coated corrugated metal gaskets of Examples 14 to 16 and Comparative Examples 10 and 11 have a (t ₀ ) of 0.8 mm, a (t ₁ -t ₀ ) of 0.4 mm, and a corrugated pitch of 3.2 mm. The thickness (t ₂ ) of the material was 0.38 mm. The results are shown in Table 5.

From Table 1, Examples 1-4, the difference between the metal plate of the apparent thickness after wave processed _{(t 1)} and the thickness of unprocessed metal sheet _{(t 0)} is not less than 0.2 mm, 19. Even with a tightening surface pressure as low as 6 N / mm ² , it has good sealing properties. On the other hand, in Comparative Examples 1 to 4 in which (t ₁ -t ₀ ) is 0.15 mm or less, seal leakage was confirmed in the case of a low tightening surface pressure such as 19.6 N / mm ² .

From Tables 1 and 2, in Examples 3 and 5-8, since the thickness (t ₀ ) of the metal plate before processing is 0.4 to 1.2 mm, the tightening is as low as 19.6 N / mm ^2. Even with surface pressure, it has good sealing properties. On the other hand, in the comparative example in which the thickness (t ₀ ) of the metal plate before processing was 0.1 mm or 1.5 mm, seal leakage was confirmed at a tightening surface pressure of 29.4 N / mm ² or less.

From Tables 1 and 3, since Example 3 and Example 9 have two or more ridges on one side, good sealing is achieved even at a low clamping surface pressure of 19.6 N / mm ^2. Have sex. On the other hand, in Comparative Examples 7 and 8, since the number of crests on one surface is 1 or less, seal leakage was confirmed in the case of a low tightening surface pressure such as 19.6 N / mm ² .

From Table 1 and Table 4, since Example 3 and Examples 10-13 have the thickness of a coating | covering material in the range of 0.15-1.2 mm, it is a low fastening surface pressure like 19.6 N / mm < ² >. Even if it exists, it has a favorable sealing performance. On the other hand, since the thickness of the coating material in Comparative Example 9 was 1.5 mm, seal leakage was confirmed at a tightening surface pressure of 29.4 N / mm ² or less.

From Table 1 and Table 5, since the density | concentration of a coating material is 0.7-1.35g / cm < ³ > in Examples 14-16, even if it is a low fastening surface pressure like 19.6 N / mm < ² >. , Have good sealing properties. On the other hand, Comparative Examples 10 and 11 the density of the coating material is 0.5 g / cm ^3, or 1.65 g / cm ^3, in 29.4 N / mm ² or less tightening surface pressure, seal leakage is confirmed .

According to the method for producing a coated corrugated metal gasket and the coated corrugated metal gasket of the present invention , even at a low tightening surface pressure at a connecting point of a pipe such as an oil refinery / petrochemical plant, a power plant, a steelworks, etc. Can be sealed well, which is advantageous in terms of maintenance management.

DESCRIPTION OF SYMBOLS 1 Metal plate 2 Coating | covering material 10 Coating | coated corrugated metal gasket 11 Pressure receiving surface 12 Flow path (fluid side)
14 Non-fluid side

Claims (3)

A corrugated metal plate with corrugations on both sides is coated with a covering material. One side of the metal plate has two or more peaks, and the other side has one or more peaks. In the method of manufacturing a processed coated corrugated metal gasket,
The processing of the corrugation is a wave-shaped mold, which is a combination of arc-shaped molds of 180 degrees or less or a combination of an arc-shaped mold of 180 degrees or less and a linear mold,
The wave shape is pressed with an arc-shaped mold of 180 degrees or less, and then pressed so that the previously processed wave shape end portion and the newly processed wave shape end portion wrap. A method for producing a coated corrugated metal gasket. The production of a coated corrugated metal gasket according to claim 1, wherein pressing is performed so that a lap between a wave-form end portion processed first and a wave-form start end portion to be newly processed is 0.5 to 3.0 mm. Method. A corrugated metal plate with corrugations on both sides is coated with a covering material. One side of the metal plate has two or more peaks, and the other side has one or more peaks. A coated corrugated metal gasket which is processed and satisfies the following conditions (1) to (6) .
(1) The thickness (t ₀ ) of the metal plate is 0.4 to 1.2 mm,
(2) The difference (t ₁ -t ₀ ) between the height (t ₁ ) of the waveform and the thickness (t ₀ ) of the metal plate is 0.2 mm or more,
(3) Thickness of the coating material _{(t 2)} is 0.15～1.2Mm,
(4) The density of the coating material is 0.7 to 1.35 g / cm ³ ,
(5) The shape of the entire gasket is a combination of arc shapes of 180 degrees or less, or a combination of an arc shape of 180 degrees or less and a linear shape ,
(6) A wrap portion is provided at the end portion of the wave shape processed first and the start end portion of the wave shape processed next, and the waveform is continuous without interruption.

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