JPWO2018011933A1 - Laminated metal plate assembly - Google Patents

Abstract

The laminated metal plate assembly 50 of the present invention includes a multi-layer metal plate (first metal plate 50a, second metal plate 50b) and a joint 51 that joins the multi-layer metal plates 50a and 50b. The joint portion 51 has, for example, a point shape and is regularly arranged. The joint 51 can be formed by a known method such as spot welding. The gasket 1 using the laminated metal plate assembly 50 can compensate for a decrease in the surface pressure even when the beads are set loose, and maintain a sealing property even when used for a long time in a high temperature environment. Can do.

Description

  The present invention relates to a laminated metal plate assembly.

  Gaskets having heat resistance are used for automobile exhaust system parts such as automobile and motorcycle engines, exhaust manifolds, catalytic converters, EGR coolers, and turbochargers.

  FIG. 1 and FIG. 2 show examples of gaskets used for connecting parts of automobile exhaust system parts. As shown in FIGS. 1 and 2, for example, a connection portion 30a between the exhaust manifold 10 and the exhaust pipe 20a, a connection portion 30b between the exhaust pipe 20a and the exhaust pipe 20b, and the like are formed on the flanges 21a and 21b, respectively. The bolts 40a and 40b inserted in the through holes are fastened to tighten them. At this time, the gaskets 1a and 1b are sandwiched between the gaps between the connecting portions 30a and 30b. The gasket has an uneven portion (hereinafter referred to as “bead”), and the gasket bead is deformed by tightening the bolts 40a and 40b. As a result, prevention of gas leakage from the connection portions 30a and 30b can be achieved.

As a gasket that can withstand use at high temperatures, a high nitrogen stainless steel proposed in Japanese Patent Application Laid-Open No. 2009-249658 (Patent Document 1) or JIS G 4902 (corrosion and heat resistance) is used for a connection part of an exhaust system part of an automobile. An expensive material containing 50% or more of Ni by mass%, such as NCF625 and NCF718 defined in (Superalloy plate), is used. A gasket using a clad material instead of a single metal plate is known.

  As a gasket using a clad material, Japanese Patent Application Laid-Open No. 09-109136 (Patent Document 2) discloses a metal gasket in which ferritic stainless steel is joined to a portion exposed to a corrosive atmosphere of a substrate made of austenitic stainless steel. Is disclosed. Japanese Utility Model Publication No. 62-2360 (Patent Document 3) discloses a gasket in which a ferrite structure layer is bonded to both surfaces of an austenite structure layer to cause creep deformation in the layer thickness direction.

JP 2009-249658 A JP 09-109136 A Japanese Utility Model Publication No. 62-2360

  Automobile exhaust system parts undergo high-temperature thermal cycles due to the heat of exhaust gas, so that expansion and contraction are repeated, and so-called “sagging” occurs in which the repulsion force of the beads decreases due to material recovery and recrystallization. . When settling occurs in the bead, the surface pressure between the bead and the flange is lowered, and the exhaust gas pressure cannot be withstood and complete sealing becomes difficult.

  With the use of a material such as that disclosed in Patent Document 1, it is inevitable that a single metal plate is used for a high temperature of combustion gas for the purpose of improving combustion efficiency. The technique of Patent Document 2 is mainly for the purpose of preventing stress corrosion cracking, and has not been studied for the bead sag. In patent document 3, it does not describe about forming a bead in a gasket. Further, the thermal expansion at high temperature in the vertical direction of the gasket thickness is suppressed, and the thickness of the entire gasket is increased from the initial dimension, and the sag of the beads has not been studied.

  The present invention has been made in order to solve the above-described problems of the prior art, and is a laminated metal plate useful for use in a gasket capable of effectively preventing a decrease in sealing performance even when a settling of a bead occurs. The object is to provide a joined body.

  A heat-resistant gasket for automobiles, which is one of the technical fields targeted by the present invention, is mounted on an automobile and its usage time is several thousand hours. was there.

  FIG. 3 is a partially enlarged view of the periphery of the connection portion 30a between the exhaust manifold 10 and the exhaust pipe 20a in FIG. As shown in the initial state of FIG. 3 (a), the gasket 1a is sandwiched between the gaps of the connecting portion 30a, and the bead of the gasket 1a is deformed by tightening the bolt 40a. Therefore, the gasket 1a and the exhaust manifold 10 The contact surface is fixed in a state where a predetermined surface pressure is applied.

  However, as shown in FIG. 3 (b), when used at a high temperature for a long time, the bead becomes stale. As a result, the surface pressure between the gasket 1a and the exhaust manifold 10 is reduced, and it becomes impossible to withstand the internal pressure of the exhaust gas flowing through the exhaust pipe 20a (the white arrow in the figure), resulting in leakage. And a clearance gap arises between the gasket 1a and the exhaust manifold 10, and it becomes impossible to ensure sealing performance.

  Therefore, the present inventors decided to configure the gasket 1a with a structure in which metal plates were laminated and joined (hereinafter referred to as “laminated metal plate joined body”). The gasket 1a can ensure high sealing performance when a laminated metal plate assembly composed of metal plates having different thermal expansion coefficients is used. Specifically, when a laminated metal plate assembly in which a metal plate having a small coefficient of thermal expansion is arranged on the surface side (upper side) where the beads are raised and formed and a metal plate having a large coefficient of thermal expansion is arranged on the lower side is used, The bead warps upward by heating with the exhaust gas. As a result, as shown in FIG. 3C, the gasket 1a has a high surface pressure between the exhaust manifold 10 and the exhaust pipe flange 21a, and can secure a sealing property. This is effective in increasing the temperature of combustion gas for the purpose of improving combustion efficiency, and the same effect is expected.

  On the other hand, a clad material obtained by bonding the entire surface as a laminated metal plate assembly can also be used. In that case, the clad material is efficiently bonded by heating generally at a temperature higher than room temperature and lower than the recrystallization temperature, or heat higher than the recrystallization temperature. Heating at the time of joining is considered to be inevitable for steels mainly composed of iron, stainless steel, and the like. However, when metal plates having different coefficients of thermal expansion are joined at a high temperature, the clad material cannot maintain flatness due to the difference in shrinkage after cooling to room temperature. Furthermore, when it manufactures to the metal strip (steel strip etc.) advantageous to industrial production, winding is difficult, and even if it can wind up, the expansion | deployment after winding is difficult. This is a major safety issue. For this reason, it is preferable that the clad material has a configuration capable of maintaining flatness even after cooling to room temperature.

  Based on the above idea, the present inventors have studied in detail the structure of a gasket that achieves the object of the present invention and the characteristics after holding at high temperature, and found a laminated metal plate assembly useful for the gasket. The gist of the present invention is as follows.

(1) a multilayer metal plate;
It comprises a joint part that joins the metal plates of the multilayer,
A laminated metal plate assembly in which the joint portion regularly arranges points or lines.

  (2) The joint portion includes a first joint portion group formed on a plurality of parallel lines and a second joint portion group formed on a plurality of parallel lines having a certain angle with respect to the parallel lines. The laminated metal plate assembly of (1) above.

  (3) The laminate according to (1), wherein the joint includes a first joint group formed on a plurality of parallel lines and a second joint group formed on a translationally symmetric line with respect to the parallel lines. Metal plate assembly.

(4) A laminated metal plate assembly used for a gasket having an exhaust gas conduction hole,
The plurality of parallel lines in which the first joint group is formed, and the plurality of parallel lines in which the second joint group is formed and intersections are arranged so as to be at positions corresponding to the center of gravity of the exhaust gas conduction hole. The laminated metal plate assembly according to any one of (1) to (3) above.

  (5) The laminated metal plate assembly according to (4), wherein the joining portion is formed on radiation passing through points that are equiangularly spaced from a position corresponding to the center of gravity of the exhaust gas conduction hole.

  (6) The above (4), wherein the joint portion is formed on radiation passing through a point obtained by equally dividing the length of the inner peripheral edge of the exhaust gas conduction hole with a position corresponding to the center of gravity of the exhaust gas conduction hole as a base point. ) Laminated metal plate assembly.

(7) A gasket including a first flat surface portion including the exhaust gas conduction hole, a second flat surface portion including a bolt insertion hole, and a bead provided between the first flat surface portion and the second flat surface portion. A laminated metal plate assembly used,
The joint passes through a point where the length of the boundary line between the position corresponding to the first plane portion and the position corresponding to the bead is equally divided with the position corresponding to the center of gravity of the exhaust gas conduction hole as a base point. The laminated metal plate assembly according to (4), formed on radiation.

  (8) The laminated metal plate assembly according to (3), wherein the translationally symmetric line is a straight line.

(9) The laminated metal plate assembly of (1) to (8), wherein at least one of the multilayer metal plates is a metal strip.
(10) The metal plate is an austenitic stainless steel plate and a ferritic stainless steel plate.
The laminated metal plate assembly according to any one of (1) to (9) above.

  When the laminated metal plate assembly of the present invention is used, a gasket that can compensate for a decrease in surface pressure even when the beads are set loose and can maintain a sealing property even when used for a long time in a high temperature environment. Can be provided.

The fragmentary sectional view which shows the example of the gasket used for the connection part of the exhaust system components of a motor vehicle. The partial exploded view which shows the example of the gasket used for the connection part of the exhaust system components of a motor vehicle. The fragmentary sectional view which shows the various aspects of a gasket. (A) shows a mode in which the initial internal pressure is not applied, and (b) shows a normal gasket mode in which the sealing performance cannot be secured when the internal pressure is applied after being exposed to high temperature for a long time. (C) shows an embodiment of the present invention that ensures sealing performance even when an internal pressure is applied after being exposed to a high temperature for a long time. The perspective view which shows the example of the laminated metal plate assembly which concerns on this invention. The top view which shows the other example of the laminated metal plate assembly which concerns on this invention. The top view which shows the other example of the laminated metal plate assembly which concerns on this invention. Sectional drawing which shows the example of the gasket using the laminated metal plate assembly which concerns on this invention. The top view which shows the example of the gasket using the laminated metal plate assembly which concerns on this invention. The top view which shows the other example of the gasket using the laminated metal plate assembly which concerns on this invention. The top view which shows the other example of the gasket using the laminated metal plate assembly which concerns on this invention. The figure which shows the example of the gasket comprised by a 2 or more laminated metal plate assembly. (A) And (b) shows the gasket comprised by two laminated metal plate assemblies, (c) shows the gasket comprised by three laminated metal plate assemblies. The top view and (b) sectional view showing the example of the gasket used in the example of the present invention. The top view which shows the example (with bead welding) of the gasket used in the Example of this invention. The top view which shows the example (increase in the number of welding) of the gasket used in the Example of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1. Laminated Metal Plate Assembly As shown in FIG. 4, the laminated metal plate assembly 50 of this embodiment includes a multilayer metal plate (first metal plate 50a, second metal plate 50b) and a multilayer metal plate 50a. , 50b are joined together. The joint portion 51 has a point shape and is regularly arranged. The joint 51 can be formed by a known method such as spot welding. Moreover, although illustration is abbreviate | omitted, what has not a point shape but a linear shape and arrange | positioned regularly may be sufficient. In this case, for example, it can be formed by a known method such as seam welding. 4 shows an example in which two metal plates are laminated, three or more metal plates may be laminated according to the purpose.

  In the laminated metal plate assembly 55a shown in FIG. 5, the joint portions 51a and 51b are regularly arranged. That is, the joint portion 51a is formed on a plurality of parallel lines Pla and constitutes a first joint portion group, and the joint portion 51b is at a certain angle (90 ° in the example shown in FIG. 5) with respect to the parallel lines Pla. Are formed on a plurality of parallel lines Plb and constitute a second joint group. From another viewpoint, the joint portion 51a is formed on a plurality of parallel lines Pla, and the joint portion 51b is formed on a line Plb that is translationally symmetric with respect to the parallel lines Pla, and constitutes a second joint portion group. doing. The translational line Plb is preferably a straight line with respect to the parallel line Pla.

  In the laminated metal plate assembly 55b shown in FIG. 6, the joint portions 51c, 51d, 51e are regularly arranged. That is, the joint portion 51c is formed on a plurality of parallel lines Plc and constitutes a first joint portion group, and the joint portion 51d is at a certain angle with respect to the parallel lines Plc (60 ° in the example shown in FIG. 6). Are formed on a plurality of parallel lines Pld to form a second joint group, and the joint 51e has a plurality of parallels having a certain angle (120 ° in the example shown in FIG. 6) with respect to the parallel lines Plc. It is formed on the line Ple and constitutes the second joint group. From another viewpoint, the joint portion 51c is formed on a plurality of parallel lines Plc, and the joint portions 51d and 51e are formed on translational symmetry lines Pld and Ple with respect to the parallel line Plc, respectively. It constitutes a joint group. The translational symmetry lines Pld and Ple with respect to the parallel line Plc are preferably straight lines.

  Hereinafter, the case where the laminated metal plate assemblies 55a and 55b shown in FIGS. 5 and 6 are used for a gasket having exhaust gas conduction holes will be described. Reference numeral 60 in FIG. 5 and reference numeral 61 in FIG. 6 are portions (exhaust gas conduction hole planned portions) scheduled to be punched as exhaust gas conduction holes, and reference numerals 60 a and 61 a denote exhaust gas conduction holes, respectively. It is a position corresponding to the center of gravity. In the example shown in FIG. 5, the intersections of the plurality of parallel lines Pla formed with the first joint group 51 a and the plurality of parallel lines Plb formed with the second joint group 51 b are the exhaust gas conduction hole planned portions 60. It arrange | positions so that it may correspond with the position 60a corresponding to a gravity center. Further, in the example shown in FIG. 6, a plurality of parallel lines Plc formed with the first joint group 51c, a plurality of parallel lines Pld formed with the second joint group 51d, intersections and another second joint part. The plurality of parallel lines Ple and the intersections where the group 51e is formed are arranged so as to coincide with a position 61a corresponding to the center of gravity of the exhaust gas conduction hole planned portion 61. As shown in FIGS. 5 and 6, the exhaust gas conduction hole (exhaust gas conduction hole planned portion 61) may be circular or elliptical, and the shape is not limited.

The joint 51a and the joint 51b, and the joint 51c, the joint 51d, and the joint 51e are preferably formed at positions corresponding to the following radiations when used in gaskets. This will be described in detail later.
(A) Radiation passing through a point that is equiangularly spaced from the position corresponding to the center of gravity of the exhaust gas conduction hole (b) The length of the inner peripheral edge of the exhaust gas conduction hole from the position corresponding to the center of gravity of the exhaust gas conduction hole Radiation (c) that passes through the points divided evenly The first plane part provided with the exhaust gas conduction hole, the second plane part provided with the bolt insertion hole, and provided between the first plane part and the second plane part Radiation that passes through points in a gasket provided with a bead that equally divides the length of the boundary line between the position corresponding to the first plane portion and the position corresponding to the bead, with the position corresponding to the center of gravity of the exhaust gas conduction hole as a base point

  When austenitic stainless steel is used as the first metal plate layer 50a, it is desirable that the coefficient of thermal expansion is higher, and when ferritic stainless steel is used as the second metal plate layer 50b, the coefficient of thermal expansion is higher. A low is desirable. The chemical composition of austenitic stainless steel and ferritic stainless steel is not limited to a specific chemical composition. Examples of the austenitic stainless steel include SUS301, SUS301L, SUS304, SUS304LN, SUS316L, SUS310S, and SUS201 defined in JIS standards. Examples of the ferritic stainless steel include SUS409L, SUS410L, SUS430, SUS444, SUS436J1L, SUS436L, and SUS430JIL.

  Here, when a thermal history including heating and cooling is applied, if the structure is such that a concave warp occurs on the ferritic stainless steel plate layer side after cooling, the thickness of the laminated metal plate assembly, the austenitic stainless steel plate layer There is no restriction on the balance of the thickness of the ferritic stainless steel sheet layer.

  At this time, if the ratio of the thickness of the first metal layer 50a (austenitic stainless steel layer) to the total thickness is too large, warpage due to a difference in thermal expansion from the second metal layer 50b (ferritic stainless steel layer) occurs. It becomes difficult to let you. On the other hand, even if the thickness ratio is too small, it becomes difficult to generate warpage due to a difference in thermal expansion. Therefore, the ratio of the thickness of the first metal layer 5a (austenitic stainless steel layer) to the total thickness is preferably 20 to 80%. A preferred lower limit is 30%, and a more preferred value is 45%. On the other hand, the preferable upper limit is 70%, and more preferably 55%.

  The laminated metal plate assembly 50 preferably has a two-layer structure from the viewpoint of manufacturing cost, but may include three or more metal plate layers. However, even if the clad has three or more layers, the thickness ratio of the first metal plate layer 50a (the layer having a high coefficient of thermal expansion) needs to be 20% or more and 80% or less.

  As mentioned above, although the gasket mainly comprised by one laminated metal plate assembly was demonstrated, the gasket comprised by two or more laminated metal plate assemblies may be sufficient. FIG. 11 shows an example of a gasket constituted by two or more laminated metal plate assemblies.

  Even when the total thickness of the gasket (in the case of a gasket composed of a single laminated metal plate assembly 5, the total thickness of the laminated metal plate assembly 5) is small, the beads are raised and formed at high temperatures. Although it is possible to warp to the surface 8a side, depending on the combination of materials, when the total thickness of the gasket is less than 0.1 mm, the warping force is reduced, and the exhaust gas sealability is poor. For this reason, the total thickness of a gasket shall be 0.1 mm or more. On the other hand, as the total thickness of the gasket increases, the material cost increases. For this reason, the total thickness of the gasket is preferably 1.5 mm or less. A more preferred upper limit is 1.0 mm, a more preferred upper limit is 0.7 mm, and a still more preferred upper limit is 0.5 mm. The total thickness of the laminated metal plate assembly constituting the gasket is preferably 1.0 mm or less, preferably 0.7 mm or less, and more preferably 0.5 mm or less. The total thickness of the laminated metal plate assembly may be thin, but a preferred lower limit is 0.1 mm.

2. Manufacturing method of laminated metal plate assembly As a manufacturing method of the laminated metal plate assembly, for example, spot welding (resistance welding), seam welding in a state where metal plates to be the first metal plate 50a and the second metal 50b are laminated. It is good to join by well-known methods, such as welding, such as crimping, and crimping.

3. Gasket Using Laminated Metal Plate Assembly As shown in FIG. 7, the gasket 1 of the present embodiment is composed of a laminated metal plate assembly including a first metal plate layer 5a and a second metal plate layer 5b. And this gasket 1 is provided between the 1st plane part 6 provided with the waste gas conduction hole 6a, the 2nd plane part 7 provided with the bolt insertion hole 7a, and the 1st plane part 6 and the 2nd plane part 7. Provided beads 8. The bead 8 is formed so as to rise to one side in the thickness direction of the laminated metal plate assembly at a position surrounding the exhaust gas conduction hole 6a. The exhaust gas conduction hole 6a is for conducting fluid. In the example shown to a figure, the 1st plane part 6 and the 2nd plane part 7 are provided with the junction parts 6b and 7b, and the 1st metal plate layer 5a and the 2nd metal plate layer 5b are joined by these. . In addition, as shown in FIG. 7, the bead 8 may be provided with the junction part 8b.

  The gasket 1 of the present embodiment utilizes the difference in the thermal expansion coefficient at high temperatures between the first metal plate layer 5a and the second metal plate layer 5b joined by the joining portions 6b and 7b. That is, when a material having a high coefficient of thermal expansion (for example, austenitic stainless steel) is used as the first metal plate layer 5a, and a material having a low coefficient of thermal expansion (for example, ferritic stainless steel) is used as the second metal plate layer 5b. When the temperature is high, the bead 8 of the gasket 1 warps to the second metal plate layer 5b side (the surface 8a side where the beads are raised and formed). As a result, even if the bead 8 is used for a long time at high temperature and the bead 8 is set back as shown in FIG. 3C, the bead 8 can be warped in the rising direction to restore the surface pressure. . As a result, the surface pressure between the gasket 1a, the exhaust manifold 10 and the exhaust pipe flange 21a can be maintained, and the internal pressure of the exhaust gas flowing through the exhaust pipe 20a (the white arrow in the figure) can be withstood. The necessary sealing performance can be achieved.

  In the example illustrated in FIG. 3, the gasket 1a sandwiched between the connection portions 30a between the exhaust manifold 10 and the exhaust pipe 20a is described as an example, but the effect of the present invention is not limited to such an example. The same effects as described above can be obtained as long as the gasket is used in a portion used at a high temperature, such as the gasket 1b sandwiched between the connection portions 30b between the exhaust pipe 20a and the exhaust pipe 20b. Hereinafter, the exhaust manifold 10 or the flange facing the gasket is collectively referred to as a “flange or the like”.

  Hereinafter, the position where the joint portion is formed will be described with reference to FIGS.

  As shown in FIG. 8, the joints 6b and 7b are, for example, radiation La passing through points (intersections of the radiations La and Lb and the inner peripheral edge 6d) that are equiangularly spaced from the center of gravity 6c of the exhaust gas conduction hole 6a. , Lb may be formed. In the example shown in FIG. 8 and FIG. 9, two radiations La and Lb passing through a point having an interval of 90 ° are shown, but the angle is not limited to this. That is, the joint portion may be formed on three radiations that pass through points at intervals of 60 °, or may be formed on three radiations that pass through points at intervals of 45 °. It may be formed on radiation that passes through points that are equiangularly spaced at a narrower angle. In any case, it is important to form the joint in the laminated metal plate assembly in advance so that the joint is disposed at such a desired position.

  As shown in FIG. 8, it is sufficient that the joining portion is formed at least on the first plane portion 6 and the second plane portion 7 (see 6b and 7b in FIG. 8). As shown in FIG. In addition to the plane part 6 and the second plane part 7, it may be formed on the bead 8 (see 8b in FIG. 9). The first metal plate layer 5a and the second metal plate layer 5b can be bonded by these bonding portions 6b and 7b (or 8b).

  As shown in FIG. 10, the junctions 6b and 7b (or 8b) are obtained by dividing the length of the inner peripheral edge 6d equally with the center of gravity 6c of the exhaust gas conduction hole 6a as a base point (radiation Lc to Le and the inner peripheral edge). May be formed on the radiations Lc to Le passing through (intersection with 6d). Also in this case, the first metal plate layer 5a and the second metal plate layer 5b can be joined by the joint portions 6b and 7b (or 8b). In addition, the joints 6b and 7b (or 8b) pass through a point that equally divides the length of the boundary line 6e between the first plane part 6 and the bead 8 with the center of gravity 6c of the exhaust gas conduction hole 6a as a base point. It may be formed on (not shown). Also in this case, the first metal plate layer 5a and the second metal plate layer 5b can be joined by the joint portions 6b and 7b (or 8b). Also in this case, it is important to form the joint portion in the laminated metal plate assembly in advance so that the joint portion is disposed at such a desired position.

  There is no particular limitation on the (cross-sectional) shape of the bead as long as it is formed at one position in the thickness direction of the substrate at a position surrounding the exhaust gas conduction hole. That is, the cross-sectional shape may be a bead such as a full bead or a trapezoidal bead formed by partially raising a flat substrate as shown in FIG. 7, or it may be formed upright from the inner peripheral end of the through hole. A half bead, that is, a half bead configured by a taper may be used. However, the effect of the present invention is remarkable in the case of a gasket having a half bead.

  The gasket 100 in the embodiment shown in FIG. 11A uses two gasket materials 100a and 100b each composed of a laminated metal plate assembly. The gasket materials 100a and 100b are respectively provided with first plane portions 110a and 110b (actually provided with exhaust gas conduction holes as shown in FIGS. 7 to 10) and second plane portions 130a and 130b (as shown in FIGS. 7 to 10). As shown, it is actually provided with bolt insertion holes.), And bead 120a, 120b provided between the first plane part 110a, 110b and the second plane part 130a, 130b. In the gasket 100, the second flat surface portion 130a of the gasket material 100a and the first flat surface portion 110b of the gasket material 100b are joined. With such a configuration, when a high temperature is applied to the gasket 100, the gasket materials 100a and 100b are warped to the second metal layer side (the upper side in the drawing) having a small coefficient of thermal expansion, whereby one sheet Compared to a gasket composed of a laminated metal plate assembly, the warpage is expected to increase by about twice, and the surface pressure with the flange or the like increases.

  The gasket 200 in the embodiment shown in FIG. 11B uses two gasket materials 200a and 200b each formed of a laminated metal plate assembly. Gasket materials 200a and 200b are respectively provided with first flat portions 210a and 210b (actually provided with exhaust gas conduction holes as shown in FIGS. 7 to 10) and second flat portions 230a and 230b (see FIGS. 7 to 10). As shown, it is actually provided with bolt insertion holes.), And bead 220a, 220b provided between the first plane part 210a, 210b and the second plane part 230a, 230b. And each 2nd plane part 230a, 230b is joined. With such a configuration, when a high temperature is applied to the gasket 200, the second metal layer side having a small coefficient of thermal expansion, that is, the gasket material 200a warps on the upper side of the drawing and 200b warps on the lower side of the drawing. In comparison with a gasket composed of a single laminated metal plate assembly, the warpage is expected to increase by about twice, and the surface pressure with the flange or the like increases.

  The gasket 300 in the embodiment shown in FIG. 11C uses three gasket materials 300a, 300b, and 300c each formed of a laminated metal plate assembly. The gasket materials 300a, 300b, and 300c are respectively provided with first plane portions 310a, 310b, and 310c (actually provided with exhaust gas conduction holes as shown in FIGS. 7 to 10) and second plane portions 330a, 330b, and 330c, respectively. (As shown in FIGS. 7 to 10, bolt insertion holes are actually provided.), Beads 320 a provided between the first flat portions 310 a, 310 b, 310 c and the second flat portions 330 a, 330 b, 330 c, 320b and 320c are provided. In the gasket 300, the first flat portions 310a and 310b of the gasket materials 300a and 300b are joined together, and the second flat portions 330b and 330c of the gasket materials 300b and 300c are joined together. With such a configuration, when a high temperature is applied to the gasket 300, an increase in warpage is expected to be about three times that of a gasket composed of a single laminated metal plate assembly. Surface pressure increases.

  In addition, the total thickness of a gasket is synonymous with the total thickness of a laminated metal plate assembly in the case of a gasket composed of a single laminated metal plate assembly. For example, in the case of a gasket composed of two or more laminated metal plate assemblies, it means the total thickness of all laminated metal plate assemblies. In the case of a gasket composed of two or more laminated metal plate assemblies, the total thickness of the respective laminated metal plate assemblies is taken as the total thickness of the gasket.

4). Gasket Manufacturing Method A gasket can be manufactured by a technique such as press molding using the above laminated metal plate assembly. Specifically, a gasket having a bead of a predetermined shape can be manufactured by blanking (punching) or press molding. Moreover, it is also possible to overlap these laminated metal plate assemblies and use them as a multi-layer stack such as a two-layer stack or a three-layer stack. In this case, the laminated metal plate assemblies may be fixed by screws or the like or spot welding. At this time, it is also possible to fix by welding a part of the periphery or by welding the whole.

Next, examples of the present invention will be described. The conditions in the examples are one example of conditions used for confirming the feasibility and effects of the present invention, and the present invention is based on this one example of conditions. It is not limited. The present invention can adopt various conditions as long as the object of the present invention is achieved without departing from the gist of the present invention.

(Example 1)
After spot welding in a state where an austenitic stainless steel plate having a chemical composition shown in Table 1 and a ferritic stainless steel plate were laminated, a gasket as shown in FIG. 12 was mainly produced by blanking (punching) and press molding. Some manufactured spot gaskets also on the beads between the first plane part and the second plane part as shown in FIG. 13, and the number of spot welds increased as shown in FIG. Spot welding was performed at 4 mmφ. The dimensions of each part are shown as a representative in FIG. 12, and the same applies to FIGS. As shown in the top view of FIG. 12A, the blanking has a major axis of 116 mm and a minor axis of 86 mm, and a hole having a diameter of 40 mm around the intersection is also punched out simultaneously. Next, it was pressed into a shape simulating a half-bead gasket.

  As shown in the cross-sectional view of FIG. 12B, the initial bead height (from the thickness center on the bottom surface side to the thickness center on the top surface side) was 1.0 mm, and the warpage at a high temperature (700 ° C.) was measured. In addition, an endurance test simulating actual machine conditions was conducted, and the sealability was evaluated with ◎ (optimum), ○ (achieved), and △ (not achieved, but better than conventional materials). The results are shown in Table 2. The upper plate in Table 2 is one plate on the upper side of the paper surface when the gasket shown in FIG.

  In Table 2, no. 1-53 generate | occur | produces a fixed curvature at the time of high temperature, and is excellent in sealing performance. Regarding the effect of spot welding, No. 1 was performed only on the flat surface as shown in FIG. Compared with Nos. 14, 22, and 28, No. 14 was spot welded to the beads as shown in FIG. 15, 23, 29, No. 1 with increased spot welding as shown in FIG. The warpages 16 and 24 are both large. No. 43 and 44 are clads between ferritic stainless steels, and the difference in coefficient of thermal expansion is small. No. 45 and 46 are clads between austenitic stainless steels, and the difference in coefficient of thermal expansion is small. For this reason, warpage at high temperature is small. Sealability is inferior compared with 1-40.

No. Nos. 47 and 50 have a large total plate thickness, and thus warp at a high temperature is large, but the force for pressing the flange portion is weak. Sealability is inferior compared with 1-40.

No. Nos. 41, 42, 48, 49, 51 to 53 have a very high or very low plate thickness ratio of austenitic stainless steel, so that the warpage at high temperature is small. Sealability is inferior compared with 1-40.

(Example 2)
As shown in FIG. 12, after austenitic stainless steel sheet having the chemical composition shown in Table 1 and a ferritic stainless steel sheet are spot welded in a laminated state to form a three-layer or four-layer clad, blanking and press forming are performed. A gasket (without bead joints) was produced. Table 3 shows the configuration and characteristics of each cladding.

  In addition, when it is set as the gasket shown in FIG.12 (b), a laminated metal plate assembly is a 1st board, a 2nd board, and a 3rd board in an order from the side (uppermost side of a paper surface) in which the bead was raised and formed. The results are shown in Table 3 as the fourth plate. In Table 3, no. Nos. 54 to 61 satisfy the provisions of the present invention, warp in a direction to fill a gap with a flange or the like at high temperature, and have excellent sealing properties.

Example 3
As shown in FIG. 12, after austenitic stainless steel plate having the chemical composition shown in Table 1 and a ferritic stainless steel plate are spot welded to form a two-layer or three-layer clad, blanking and press forming are performed. A gasket material (without a bead joint) was used. Next, the cross-sectional structure shown in FIGS. 11A to 11C was formed by spot welding. Table 4 shows the configuration and characteristics of each cladding.

  In the case of the gasket shown in FIG. 12 (b), each laminated metal plate assembly includes the first plate, the second plate, and the first plate in order from the side where the beads are raised and formed (the uppermost side of the paper). The three plates are shown in Table 4. In Table 4, Invention Examples 62 to 67 satisfy the provisions of the present invention, warp in the direction of filling the gap with the flange at high temperature, and have excellent sealing properties.

  When the laminated metal plate assembly of the present invention is used, a gasket that can compensate for a decrease in surface pressure even when the beads are set loose and can maintain a sealing property even when used for a long time in a high temperature environment. Can be provided. Therefore, the present invention has high applicability in the machine component manufacturing industry.

1, 1a, 1b Gasket 5a 1st metal plate 5b 2nd metal plate 6 1st plane part 6a Exhaust gas conduction hole 6b Joint part 6c Center of gravity (center) of exhaust gas conduction hole
6d Inner peripheral edge of exhaust gas conduction hole 7 Second plane portion 7a Bolt insertion hole 7b Joint portion 8 Bead 8a Surface where beads are raised and formed 8b Joint portion 10 Exhaust manifold 20a, 20b Exhaust pipe 21a, 21b Flange 30a, 30b Connection portion 40a , 40b Bolt 50, 55a, 55b Laminated metal plate assembly 50a First metal plate 50b Second metal plate 51, 51a, 51b, 51c, 51d, 51e Joint (joint group)
60, 61 Exhaust gas conduction hole planned portion 60a, 61a Position corresponding to the center of gravity of the exhaust gas conduction hole 100, 200, 300 Gasket 100a, 100b Gasket material 110a, 110b composed of two or more laminated metal plate assemblies First plane Part 120a, 120b Bead part 130a, 130b Second plane part 200a, 200b Gasket material 210a, 210b First plane part 220a, 220b Bead part 230a, 230b Second plane part 300a, 300b, 300c Gasket material 310a, 310b, 310c First One plane part 320a, 320b, 320c Bead part 330a, 330b, 330c Second plane part
La, Lb, Lc, Ld, Le radiation

Claims (10)

A multilayer metal plate,
It comprises a joint part that joins the metal plates of the multilayer,
A laminated metal plate assembly in which the joint portion regularly arranges points or lines.   The joint portion includes a first joint portion group formed on a plurality of parallel lines and a second joint portion group formed on a plurality of parallel lines having a certain angle with respect to the parallel lines. 1. The laminated metal plate assembly according to 1.   The laminate according to claim 1, wherein the joint includes a first joint group formed on a plurality of parallel lines and a second joint group formed on a plurality of translationally symmetric lines with respect to the parallel lines. Metal plate assembly. A laminated metal plate assembly used in a gasket having exhaust gas conduction holes,
The plurality of parallel lines in which the first joint group is formed, and the plurality of parallel lines in which the second joint group is formed and intersections are arranged so as to be at positions corresponding to the center of gravity of the exhaust gas conduction hole. ing,
The laminated metal plate assembly according to any one of claims 1 to 3.   The laminated metal plate assembly according to claim 4, wherein the joining portion is formed on radiation that passes through points that are equiangularly spaced from a position corresponding to the center of gravity of the exhaust gas conduction hole.   The said junction part was formed on the radiation which passes along the point which divided | segmented the length of the inner periphery of the said exhaust gas conduction hole equally on the basis of the position corresponding to the gravity center of the said exhaust gas conduction hole. Laminated metal plate assembly. Lamination used for a gasket provided with a first plane part provided with the exhaust gas conduction hole, a second plane part provided with a bolt insertion hole, and a bead provided between the first plane part and the second plane part. A metal plate assembly,
The joint passes through a point where the length of the boundary line between the position corresponding to the first plane portion and the position corresponding to the bead is equally divided with the position corresponding to the center of gravity of the exhaust gas conduction hole as a base point. The laminated metal plate assembly according to claim 4, which is formed on radiation.   The laminated metal plate assembly according to claim 3, wherein the translationally symmetric line is a straight line.   The laminated metal plate assembly according to any one of claims 1 to 8, wherein at least one of the multilayer metal plates is a metal strip.   The laminated metal plate assembly according to any one of claims 1 to 9, wherein the metal plate is an austenitic stainless steel plate or a ferritic stainless steel plate.

Images