JP2011121081A - Cemented carbide joined body and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cemented carbide joined body having a large joined strength and a high positional accuracy of joining, and to provide a method of manufacturing the same. <P>SOLUTION: The cemented carbide joined body 1 includes: a first metallic member 2 containing tungsten carbide machine-cemented carbide and having a first joined face 5; a joined layer 4 which is joined to the first joined face 5 of the first metallic member 2 and which contains carbon consisting essentially of iron as well as diffused copper; and a second metallic member 3 containing tungsten carbide machine-cemented carbide and having a second joined face 6, wherein the second joined face 6 is joined to a face opposite to the face where the first metallic member 2 of the joined layer 4 is joined. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a cemented carbide joined body and a method for manufacturing the same, and more particularly to a cemented carbide joined body having a high joint strength and high joined body accuracy and a method for manufacturing the same.

  Conventionally, a joined body of a tungsten carbide base cemented carbide and stainless steel is used for a die for forming a ceramic honeycomb structure (die for forming a honeycomb structure), a precision die, a die, a plug, and the like.

  For example, as a die for forming a honeycomb structure, a plurality of back holes that are open on at least one surface side are formed in the first plate member, and the other surface of the first plate member communicates with the back hole. The slit-like groove is formed in a lattice shape, the other surface of the first plate-like member and the second plate-like member are joined by hot pressing, and the first plate-like member is joined to the second plate-like member. In this case, the slits are formed in a lattice shape so as to overlap the groove portions and communicate with the groove portions (see, for example, Patent Document 1). Usually, the back hole is provided at a position corresponding to (overlapping) the intersecting position in the lattice shape of the groove portion (slit formed in the lattice shape) formed in the lattice shape. When forming a honeycomb formed body using the ceramic honeycomb structure forming die described in Patent Document 1, a forming raw material containing a ceramic raw material is introduced from the back hole, and the forming raw material is inserted into the back hole having a relatively large inner diameter. Then, the honeycomb formed body (honeycomb structure) is formed by shifting to a narrow slit and extruding it from the opening of the slit as a formed body of the honeycomb structure. As described above, since the slit portion of the second plate-like member has a narrow width, a high pressure is applied when the forming raw material passes, and the slit portion is easily worn. Therefore, in the die for forming a honeycomb structure described in Patent Document 1, the second plate member is formed of a tungsten carbide-based cemented carbide having high wear resistance.

JP 2007-181976 A

  The die for forming a honeycomb structure described in Patent Document 1 is excellent in that it can prevent wear of the slit portion of the second plate member.

  On the other hand, the first plate-like member is made of stainless steel or the like having a specific composition because there is no problem of wear as much as the slit portion of the second plate-like member. However, even in the first plate-like member, when many honeycomb formed bodies are extruded, the periphery of the groove (wall surface forming the groove) may be worn. The groove portion of the first plate-like member is usually not as narrow as the slit portion of the second plate-like member. However, compared with the back hole, a higher pressure is applied during the extrusion and wears. Easy structure.

  Therefore, it is considered that a more excellent die for forming a honeycomb structure can be obtained by forming at least a portion of the first plate-like member with a tungsten carbide-based cemented carbide having high wear resistance. . In this case, for example, when the entire first plate-shaped member is formed of a tungsten carbide-based cemented carbide, the second plate-shaped member is a tungsten carbide-based cemented carbide, so the first plate-shaped member and When joining the second plate member, it is necessary to join the tungsten carbide base cemented carbides together. However, it is not always easy to make a structure in which cemented carbides of tungsten carbide based cemented carbides are joined for those that require high joint strength and high joint precision, such as a die for forming a honeycomb structure. It was.

  For example, when a sufficiently high bonding strength is required, such as a die for forming a ceramic honeycomb structure, bonding between tungsten carbide base cemented carbides is a diffusion bonding method using a high load pressure (10 MPa or more), close to the melting point of Co. This can be achieved by a diffusion bonding method at a very high temperature (1300 to 1400 ° C.), a method in which a Co-based binder is inserted between tungsten carbide base cemented carbides to be bonded, and the like. All of these require high temperature, high pressure, or both. Therefore, because the die for forming a ceramic honeycomb structure is deformed by high temperature, cooling from high temperature, or high pressure, a mold having a fine structure that requires high dimensional accuracy is produced by the above method. It was very difficult.

  As a method for joining tungsten carbide base cemented carbides together without applying high temperature or high pressure, there are a joining method after finishing the joining surface to a mirror surface, and a joining method by brazing. Since these methods are not high temperature and high pressure, it is possible to increase the accuracy of the joined body. However, in the case of the method of finishing the joining surface to a mirror surface, it becomes difficult to obtain high joining strength as the joining area increases. In addition, the manufacturing time becomes longer and the cost becomes higher. In addition, in the method of joining by brazing, a joining method using silver brazing or copper brazing is often used, but a brazing material layer is always provided between the joined tungsten carbide base cemented carbide and tungsten carbide base cemented carbide. Remains. In general, the “brazing material” is a soft metal having a low melting point, so the strength is not high, and high bonding strength and reliability cannot be obtained. In addition, since the wear resistance is extremely inferior, it is not suitable for applications such as a die for forming a ceramic honeycomb structure.

  As described above, it is difficult to join the tungsten carbide-based cemented carbides together with both joint strength and joined body accuracy. That is, in order to increase the bonding strength, it is necessary to set a high temperature and a high pressure, so that the bonding accuracy is lowered and the cost is increased and the lead time is increased. On the contrary, when the bonding accuracy is increased, the bonding strength and reliability are lowered.

  The present invention has been made in view of such problems of the prior art, and provides a cemented carbide joined body having high joining strength and reliability and high joined body accuracy, and a method for manufacturing the same. To do.

  The present invention provides the following cemented carbide joined body and a method for producing the same.

[1] A first metal member containing a tungsten carbide base cemented carbide and having a first bonding surface, and iron as a main component bonded to the first bonding surface of the first metal member. A bonding layer containing carbon and having a copper alloy diffused therein has a second bonding surface, and the second bonding surface is opposite to the surface of the bonding layer to which the first metal member is bonded. A cemented carbide joined body comprising a second metal member containing a tungsten carbide-based cemented carbide joined to the side surface.

[2] The cemented carbide joined body according to [1], wherein a material of the joining layer is a copper alloy diffused in at least one selected from the group consisting of carbon steel, alloy steel, and stainless steel.

[3] The first metal member has a plate shape in which one surface is the first bonding surface, and the second metal member has a plate shape in which one surface is the second bonding surface. The first metal member is bonded to a surface opposite to the first bonding surface, and has a third bonding surface to be bonded to the first metal member, and copper has diffused inside. And a plate-like third metal member composed of a metal body capable of causing at least one of the three phase transformations of martensite transformation, bainite transformation, and pearlite transformation by cooling of the austenite phase. The cemented carbide joined body according to [1] or [2].

[4] The first metal member is a first plate-like member in which a back hole which is a through hole for introducing a forming raw material is formed, and the second metal member communicates with the back hole. And a second plate-like member in which lattice-shaped slits for forming the forming raw material into a honeycomb shape are formed, and on the surface of the first plate-like member on which the joining layer is joined, Grooves are formed in a lattice pattern so as to overlap the slits of the second plate member and communicate with the back holes, and overlap at least the slits of the second plate member of the bonding layer. The cemented carbide joined body according to [1] or [2], wherein a through hole is formed in the portion.

[5] The first metal member and the third metal member are first plate-like members in which a back hole that is a through hole for introducing a forming raw material is formed, and the second metal member Is a second plate-like member that communicates with the back hole and has a grid-like slit for forming a forming raw material into a honeycomb shape, and is joined to the joining layer of the first plate-like member. A groove portion that is formed in a lattice shape so as to overlap with the slits of the second plate member and communicates with the back hole is formed on the surface side, and at least the second plate member of the bonding layer The cemented carbide joined body according to [3], wherein a through hole is formed in a portion overlapping the slit.

[6] The cemented carbide joined body according to any one of [1] to [5], wherein the thickness of the joining layer is 0.005 to 0.5 mm.

[7] A die for forming a honeycomb structure provided with the cemented carbide joined body according to [4] or [5].

[8] A first metal member containing a tungsten carbide-based cemented carbide and having a first joint surface; and a second metal member containing a tungsten carbide-based cemented carbide and having a second joint surface; A thin plate containing carbon and containing iron as a main component so that the first joint surface and the second joint surface face each other with the thin plate interposed therebetween, and the first metal member and the thin plate And with a copper alloy foil disposed between the second metal member and the thin plate, respectively, and pressed at a temperature of 700 ° C. to 1200 ° C. with a pressure of 0.01 to 5 MPa. The cemented carbide alloy according to any one of [1] to [3], in which the first metal member and the second metal member are joined via the thin plate. Manufacturing method of joined body.

  In the cemented carbide joined body of the present invention, the first metal member containing a tungsten carbide-based cemented carbide and the second metal member containing a tungsten carbide-based cemented carbide include iron as a main component and carbon. In addition, since it is bonded through a bonding layer in which the copper alloy is diffused, it is a cemented carbide alloy body having high bonding strength and high bonding positional accuracy.

  The method for manufacturing a cemented carbide joined body according to the present invention includes a first metal member containing a tungsten carbide-based cemented carbide and a second metal member containing a tungsten carbide-based cemented carbide comprising “carbon-containing”. While sandwiching a “thin plate mainly composed of ferrous iron” and a copper alloy foil sandwiched between “the first metal member and the thin plate and between the second metal member and the thin plate” Since the joining is performed under the conditions of superposition, a predetermined low temperature, and a low pressure, a cemented carbide joined body having high joining strength and high joined body accuracy can be manufactured. Between the first metal member containing the tungsten carbide base cemented carbide and the “thin plate containing carbon and containing iron as a main component”, and the second metal member containing the tungsten carbide base cemented carbide and “ When the copper alloy foil is sandwiched between the `` thin plate containing carbon and containing iron as a main component '' and the conditions of temperature and pressure are set, the copper alloy is `` thin plate containing carbon and containing iron as the main component '' The first metal member which diffuses into the inside and contains the tungsten carbide base cemented carbide and the “thin plate containing carbon and containing iron as a main component” are directly joined to each other, and the second metal member containing the tungsten carbide base cemented carbide is contained. The metal member and “a thin plate containing carbon and containing iron as a main component” are directly joined. And the 1st metal member containing this tungsten carbide base cemented carbide and the 2nd metal member containing the joining of "the thin plate which contains carbon and contains iron as a main component", and a tungsten carbide base cemented carbide Tungsten Carbide Cemented Carbide with a “Sheet containing carbon and iron as main component” sandwiched between it and “Sheet containing carbon and containing iron as a main component” The first metal member containing selenium and the second metal member containing tungsten carbide-based cemented carbide are firmly bonded. The cemented carbide joined body manufactured in this way is the cemented carbide joined body of the present invention.

It is a schematic diagram which shows one Embodiment of the cemented carbide joined body of this invention, and shows the cross section orthogonal to the 1st joining surface of a 1st metal member. It is a schematic diagram which expands and shows the area | region S of FIG. 1A. It is a schematic diagram which shows other embodiment of the cemented carbide alloy joined body of this invention, and shows the cross section orthogonal to the 1st joining surface of a 1st metal member. 1 is a perspective view schematically showing an embodiment of a die for forming a honeycomb structure of the present invention. 1 is a perspective view schematically showing an embodiment of a die for forming a honeycomb structure of the present invention. It is the fragmentary top view seen from the 2nd plate-shaped member side of one Embodiment of the die for honeycomb structure formation of this invention. It is a schematic diagram which shows the A-A 'cross section of FIG. FIG. 5 is a schematic diagram showing another embodiment of the honeycomb structure forming die of the present invention and showing a part of a cross section orthogonal to the first joint surface of the first plate-like member. In one embodiment of the method for producing a cemented carbide joined body of the present invention, the first metal member and the second metal member are sandwiched between “a thin plate containing carbon and containing iron as a main component”. The arrangement of each of the first metal member and the thin plate, and the second metal member and the thin plate, when the copper alloy foil is sandwiched between the first metal member and the thin metal plate, It is a schematic diagram which shows the cross section orthogonal to the 1st joint surface of a member. In another embodiment of the method for producing a cemented carbide joined body of the present invention, the first metal member and the second metal member are sandwiched with a “thin plate containing carbon and containing iron as a main component”. , “A first metal member and a third metal, and a second metal member and the thin plate” are overlapped with a copper alloy foil sandwiched therebetween, and the first metal member and the third metal It is a schematic diagram which shows each arrangement | positioning when it overlaps | superposes a member on both sides of the copper alloy foil, and shows a cross section orthogonal to the 1st joining surface of a 1st metal member.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be specifically described with reference to the drawings. However, the present invention is not limited to the following embodiments, and is within the scope of the present invention. It should be understood that design changes, improvements, and the like can be made as appropriate based on the general knowledge of vendors.

(1) Cemented carbide joined body:
As shown in FIG. 1A, one embodiment of the cemented carbide joined body of the present invention contains a tungsten carbide-based cemented carbide (hereinafter sometimes simply referred to as “carbide”), and the first joined A first metal member 2 having a surface 5, and a bonding layer 4 bonded to the first bonding surface 5 of the first metal member 2 and containing iron as a main component and containing carbon and having a copper alloy diffused; The tungsten carbide group having the second bonding surface 6 and bonded to the “surface opposite to the surface to which the first metal member 2 is bonded” of the bonding layer 4. And a second metal member 3 containing a cemented carbide. FIG. 1A is a schematic view showing an embodiment of the cemented carbide joined body of the present invention and showing a cross section orthogonal to the first joining surface 5 of the first metal member 2.

  The cemented carbide joined body 1 of the present embodiment includes a first metal member 2 containing a cemented carbide and a second metal member 3 containing a cemented carbide containing iron as a main component and carbon and a copper alloy. Are bonded by the bonding layer 4 in which the cemented carbide is diffused, so that it is not a cemented carbide bonded body having a low bonding strength as in the case where cemented carbides are bonded to each other with a brazing material, but a cemented carbide bonded body having a high bonding strength. It is.

  As shown in FIG. 1B, the cemented carbide joined body 1 of the present embodiment has the recess 7 or the like in the bonding layer 4 even if the first metal member 2 and the second metal member 3 have defects such as the recess 7. Therefore, there are few or no voids derived from the depressions 7. Thereby, the cemented carbide joined body 1 of this embodiment has very high joining strength. Here, as for the magnitude | size of the hollow 7 of a 1st metal member and a 2nd metal member, the depth is about 30 micrometers. FIG. 1B is a schematic view showing the region S of FIG. 1A in an enlarged manner, and is a cross section of a joint portion between the first metal member and the joint layer 4 and a joint portion between the second metal member and the joint layer 4 Is schematically shown in an enlarged manner.

  Moreover, when cemented carbides are joined with a brazing material, the formation of voids between the brazing material and the cemented carbide also causes a decrease in the joint strength. On the other hand, the cemented carbide joined body 1 of the present embodiment joins cemented carbides together by a joining layer 4 containing iron as a main component, containing carbon and diffusing a copper alloy. And since there is no space | gap in the joining layer 4, the cemented carbide alloy joined body 1 is a thing with high joining strength.

  In the cemented carbide joined body 1 of the present embodiment, the joining strength means a bending strength obtained by a “three-point bending test in which a joint interface is a fracture surface”.

  In the cemented carbide joined body 1 of the present embodiment, the tungsten carbide-based cemented carbide is an alloy obtained by sintering tungsten carbide and a binder. The binder is preferably at least one metal selected from the group consisting of cobalt (Co), iron (Fe), nickel (Ni), titanium (Ti), and chromium (Cr). Such a tungsten carbide base cemented carbide is particularly excellent in wear resistance and mechanical strength. In the first metal member and the second metal member constituting the cemented carbide joined body 1 of the present embodiment, it is more preferable to select cobalt as the binder.

  When cobalt is used as the binder, the cobalt content is preferably 5 to 25% by mass. When the cobalt content is less than 5% by mass, the cemented carbide may become brittle. Moreover, when the content rate of cobalt exceeds 25 mass%, hardness may become low.

  In the cemented carbide bonded body 1 of the present embodiment, the bonding layer 4 includes iron as a main component, carbon, and a copper alloy diffused. This is formed by diffusing a copper alloy in a material containing iron as a main component and carbon. The “material containing iron as a main component and containing carbon” preferably has a carbon content of 0.01 to 2.2% by mass. “Iron-based” means that 50% by mass or more of iron is contained. Furthermore, examples of the “material containing iron as a main component and containing carbon” include stainless steel, carbon tool steel, and alloy tool steel. Examples of stainless steel include SUS304, and examples of alloy tool steel include SKS.

  The thickness of the bonding layer 4 is preferably 0.005 to 0.5 mm, more preferably 0.01 to 0.2 mm, and particularly preferably 0.01 to 0.1 mm. If it is too thin, the content of the diffused copper is increased and the strength of the joining layer is lowered, so that the joining strength may be lowered. If it is too thick, it becomes easy for cobalt and carbon to diffuse from the tungsten carbide-based cemented carbide alloy to the bonding layer side, so that the tungsten carbide-based cemented carbide becomes brittle and the bonding strength of the cemented carbide alloy assembly may decrease, In addition, the wear resistance of the tungsten carbide base cemented carbide joined body may also be lowered.

  In the cemented carbide joined body 1 of the present embodiment, the first metal member 2 contains a cemented carbide, but the cemented carbide is 100% by mass and is made of a cemented carbide. Is preferred. Moreover, although the 2nd metal member 3 also contains a cemented carbide alloy, a cemented carbide alloy is 100 mass%, and it is preferable that it consists of a cemented carbide alloy. The cemented carbide contained in the first metal member 2 and the cemented carbide contained in the second metal member 3 may be cemented carbides having the same composition or cemented carbides having different compositions. It may be.

The magnitude | size of each of the 1st metal member 2 and the 2nd metal member 3 is not specifically limited, It can be made into a desired magnitude | size according to a use. Although the area of the 1st joining surface 5 and the 2nd joining surface 6 is not specifically limited, It is preferable that it is 360,000 mm < ² > or less. If it is larger than 360000 mm ² , it may be difficult to increase the bonding strength due to the large area.

  Each shape of the 1st metal member 2 and the 2nd metal member 3 is not specifically limited, It can be set as arbitrary shapes. For example, it can be plate-shaped.

  In the manufacturing process of the cemented carbide joined body 1 of the present embodiment, the copper alloy diffusing in the joining layer 4 and the tungsten carbide based cemented carbide and “the one whose main component is iron and containing carbon (for example, stainless steel) Steel) ", when the copper alloy foil is sandwiched between them, the copper alloy constituting the copper alloy foil is diffused into" the iron-based material containing carbon (for example, stainless steel) " It is.

  Next, another embodiment of the cemented carbide joined body of the present invention will be described.

  As shown in FIG. 2, another embodiment of the cemented carbide joined body of the present invention is the same as the embodiment of the cemented carbide joined body of the present invention, in which the first metal member 2 is the first side. 1 is a plate-like shape which is a joining surface 5, the second metal member 3 is a plate-like shape whose one surface is a second joining surface 6, and the first joining surface of the first metal member 2 5, having a third joint surface 13 joined to the surface opposite to the first metal member 2, copper alloy 14 diffused therein, martensitic transformation, bainite transformation by cooling of the austenite phase, And a plate-like third metal member 12 made of a metal body capable of causing at least one of the three phase transformations of the pearlite transformation. FIG. 2 is a schematic view showing another embodiment of the cemented carbide joined body of the present invention and showing a cross section orthogonal to the first joining surface 5 of the first metal member 2.

  The cemented carbide joined body of the present embodiment is provided on the surface of the first metal member 2 of the embodiment of the cemented carbide joined body of the present invention (surface opposite to the first joined surface 5). 3 metal members 12 are disposed. In the cemented carbide joined body of this embodiment, tungsten carbide-based cemented carbides are firmly joined to each other through a joining layer, and the tungsten carbide-based cemented carbide (first metal member 2) and the austenite phase are cooled. A metal body (third metal member 12) capable of causing at least one of the three phase transformations of martensitic transformation, bainite transformation, and pearlite transformation is firmly bonded. In the cemented carbide joined body of the present embodiment, the first metal member 2 and the third metal member 12 sandwich a copper alloy foil between the first metal member 2 and the third metal member 12, Joined by heating and pressurizing. Therefore, at the time of joining the first metal member 2 and the third metal member 12, the copper alloy constituting the copper alloy foil diffuses into the third metal member 12, and the first metal member 2 and the first metal member 2 3 metal members 12 are firmly joined. Therefore, in the cemented carbide joined body of the present embodiment, the copper alloy 14 is diffused at the end of the third metal member 12 on the third joint surface 13 side.

  In the cemented carbide joined body of the present embodiment, at least one phase transformation among the three phase transformations of martensite transformation, bainite transformation, and pearlite transformation is performed by cooling the austenite phase that constitutes the third metal member 12. The metal body that can be raised is a metal body containing an austenite phase, and known stainless steel or the like can be used. For example, SUS630 etc. can be mentioned.

In the cemented carbide joined body of the present embodiment, the first metal member 2, the second metal member 3, and the third metal member 12 are preferably plate-shaped. Each shape of the 1st metal member 2, the 2nd metal member 3, and the 3rd metal member 12 is not specifically limited except that it is plate shape, It can be set as arbitrary shapes. Moreover, although each magnitude | size of the 1st metal member 2, the 2nd metal member 3, and the 3rd metal member 12 is not specifically limited, Each thickness is preferable 0.1-100 mm, The area (area of a cross section perpendicular to the thickness direction) is preferably 25 to 360000 mm ² .

(2) Die for forming honeycomb structure:
Next, the die for forming a honeycomb structure of the present invention will be described. As shown in FIGS. 3 to 6, an embodiment of the honeycomb structure forming die of the present invention is the same as the embodiment of the cemented carbide joined body of the present invention, wherein “the first metal member 2 is a forming raw material. The first plate-like member 22 is formed with a back hole 24 that is a through-hole for introducing gas, and the second metal member 3 communicates with the back hole 24 to form a forming raw material into a honeycomb shape. The second plate-like member 23 in which the lattice-like slits 25 are formed, and the slit of the second plate-like member 23 is formed on the surface of the first plate-like member 22 on the side where the joining layer 4 is joined. Grooves 26 are formed in a lattice pattern so as to overlap 25 and communicate with the back holes 24, and through holes (bonding layers) are formed in portions of the bonding layer 4 overlapping at least the slits 25 of the second plate-like member 23. A cemented carbide joined body 21 having a structure in which a through hole 27) is formed. It is. The honeycomb structure forming die 100 of the present embodiment may be made of cemented carbide joined body 21 or may contain other elements.

  FIG. 3 is a perspective view schematically showing one embodiment of a die for forming a honeycomb structure of the present invention. FIG. 4 is a perspective view schematically showing one embodiment of a die for forming a honeycomb structure of the present invention. FIG. 5 is a partial plan view of the honeycomb structure forming die according to an embodiment of the present invention as viewed from the second plate member side. FIG. 6 is a schematic diagram showing the A-A ′ cross section of FIG. 5.

  As described above, the honeycomb structure forming die 100 of the present embodiment is the second plate-like shape in which the second metal member 3 is formed with the slits 25 in the embodiment of the cemented carbide joined body of the present invention. Since the first metal member 2 is the member 23 and the first metal member 2 is the first plate-like member 22 in which the back hole 24 is formed (a cemented carbide joined body), the material is a cemented carbide. Thus, the back hole 24, the slit 25, and the groove 26 are not easily worn, and the bonding strength between the first plate member 22 and the second plate member 23 is high.

  In the cemented carbide joined body 21 (honeycomb structure forming die 100) shown in FIGS. 3 to 6, the first metal member 2 is provided with a back hole 24 which is a through hole for introducing a forming raw material. This is the first plate-like member 22. When the cemented carbide joined body 21 is used as a die for forming a honeycomb structure, a forming raw material for the honeycomb structure is introduced from the back hole 24.

  In the cemented carbide bonded body 21 (honeycomb structure forming die 100), the second metal member 3 communicates with the back hole 24, and lattice-like slits 25 for forming the forming raw material into a honeycomb shape are formed. In addition, the second plate-like member 23 is provided. Further, the first plate-like member 22 is formed in a lattice shape so as to overlap the slit 25 of the second plate-like member 23 on the surface where the bonding layer 4 is bonded, and communicates with the back hole 24. A groove portion 26 is formed. The width of the groove 26 (width in the cross section parallel to the surface of the first plate member 22) is preferably wider than the width of the slit 25 (width in the cross section parallel to the surface of the second plate member 23). A through hole (a through hole of the bonding layer) 27 is formed in a portion of the bonding layer 4 that overlaps at least the slit 25 of the second plate member 23. As for this, the through-hole 27 formed in the joining layer 4 may be formed only in the part which overlaps with the slit 25 of the 2nd plate-shaped member 23, and the back hole 24 of the 1st plate-shaped member 22 and It means that it may be formed in a portion overlapping the groove 26. Here, “the through-hole 27 is formed in a portion of the bonding layer 4 that overlaps the slit 25 of the second plate-like member 23” means in a cross section parallel to the surface of the second plate-like member 23. It means that the through hole 27 is formed so that the shape of the slit 25 and the shape of the through hole 27 in the cross section parallel to the surface of the bonding layer 4 are the same. Further, “the through hole 27 is formed in a portion of the bonding layer 4 that overlaps the back hole 24 and the groove 26 of the first plate-like member 22” is parallel to the surface of the first plate-like member 22. This means that the through hole 27 is formed such that the shape of the back hole 24 and the groove 26 in a simple cross section and the shape of the through hole 27 in the cross section parallel to the surface of the bonding layer 4 are the same. In addition, when a hole is opened in a portion of the bonding layer 4 that overlaps the slit 25, the bonding layer 4 is cut along the shape of the slit 25 and divided into a plurality of separated regions (divided regions). Even in such a shape, a “gap between adjacent divided regions” along the shape of the slit 25 is defined as a through hole 27. The through hole 27 of the bonding layer 4 is a hole through which the forming raw material passes. Further, the back hole 24 is formed so as to be positioned at the intersection of the groove portions 26 (intersection of the slit 25) (in the honeycomb structure forming die 100 shown in FIGS. 3 to 6, the back hole 24 is a slit. 25 (or grooves 26) are formed at every other intersection. When the cemented carbide joined body 21 is used as a die for forming a honeycomb structure, the forming raw material introduced from the back hole 24 passes through the groove portion 26 and enters the slit 25 and is pushed from the opening portion of the slit 25 to form the honeycomb structure. A shaped compact (honeycomb structure) is formed.

  The first plate-like member 22 has a plurality of columnar portions 28 that are defined by a groove portion 26 and a part of the back hole 24. In the honeycomb structure forming die 100 of the present embodiment, since the columnar portion 28 is formed on the bonding surface side of the first plate-like member 22 with the bonding layer 4 as described above, the columnar portion 28 is formed. In addition, the first plate member 22 and the second plate member 23 are bonded via the bonding layer 4.

  In the honeycomb structure forming die 100 of the present embodiment, the forming raw material introduced from the back hole 24 of the first plate-like member 22 reaches the groove 26 and is then introduced into the slit 25. The groove portion 26 also functions as a buffer portion (buffer) for guiding the forming raw material introduced from the back hole 24 to the slit 25. Therefore, when the honeycomb structure is extruded, the forming raw material introduced from the back hole 24 is used. It can be moved smoothly without hindrance, and the honeycomb structure can be formed with high accuracy. On the other hand, since the width of the slit 25 is very narrow, the pressure in the groove 26 is increased, and stress is easily concentrated on the columnar portion 28. Therefore, the columnar portion 28 is easily worn and may be deformed. Therefore, the honeycomb structure forming die 100 of the present embodiment employs a tungsten carbide-based cemented carbide with high wear resistance and strength as the material of the first plate-like member 22 having the columnar portion 28. The wear resistance and strength of the columnar portion 28 are improved. In addition, in the honeycomb structure forming die 100 of the present embodiment, the second plate member 23 also includes a tungsten carbide-based cemented carbide (preferably a tungsten carbide-based cemented carbide). The wear of the slit 25 due to the molding material at the time is also suppressed.

  In the honeycomb structure forming die 100 of the present embodiment, the depth L of the groove portion 26 (height of the columnar portion 28) L is preferably 0.1 to 3.0 mm, and more preferably 0.3 to 1.5 mm. If it is smaller than 0.1 mm, high moldability may not be realized, and if it is larger than 3.0 mm, the cell block 29 partitioned by the slit 25 may be easily collapsed. The width of the groove 26 is preferably 0.01 to 5 mm, and more preferably 0.1 to 1 mm. If it is smaller than 0.01 mm, it may be difficult to process the slit 25 with high accuracy, and if it is larger than 5 mm, the columnar part 28 partitioned by the groove part 26 may easily fall down.

  Further, the width of the slit 25 can be appropriately determined depending on the shape of the honeycomb structure to be formed. For example, in the case of a honeycomb structure forming die for extruding a honeycomb structure having a general shape, the slit width is preferably 5 to 5000 μm, and more preferably 10 to 500 μm. . Moreover, the distance between the adjacent slits 25 can be appropriately determined depending on the shape of the honeycomb structure to be formed.

  As shown in FIGS. 3 to 6, in the honeycomb structure forming die 100 of the present embodiment, a slit 25, a back hole 24, and a groove portion 26 are formed in a circular region at the center of the honeycomb structure forming die 100. Although formed, the region where the slit is formed is not limited to the above. For example, the slit is formed in the region of the central part of the honeycomb structure forming die 100 such as a quadrangle, hexagon, or octagon. Etc. may be formed.

  The shape of the back hole 24 of the die for forming a honeycomb structure 100 is not particularly limited as long as the introduced forming raw material can be guided to the slit 25. The size of the opening diameter of the back hole 24 and the like can be appropriately determined depending on the size of the honeycomb structure forming die 100, the shape of the honeycomb structure to be extruded, and the like. For example, the opening diameter of the back hole 24 is preferably 0.1 to 10 mm, and more preferably 0.5 to 3 mm. Such a back hole 24 can be formed by, for example, a conventionally known method such as electrolytic processing (ECM processing), electric discharge processing (EDM processing), laser processing, mechanical processing such as a drill. Further, the back hole 24 is preferably formed in parallel with the thickness direction of the first plate-like member 22.

  The thicknesses of the first plate-like member 22 and the second plate-like member 23 are not particularly limited, and can be appropriately determined in consideration of the general shapes of the slit 25 and the back hole 24, for example. For example, when a honeycomb structure forming die having a general shape is manufactured, the value of the ratio of the thickness of the first plate member 22 to the thickness of the second plate member 22 (first plate The thickness of the sheet-like member 22 / the thickness of the second plate-like member 23) is preferably 0.1 to 200, and more preferably 1 to 10.

  Next, another embodiment of the die for forming a honeycomb structure of the present invention will be described.

  As shown in FIG. 7, the honeycomb structure forming die 200 of the present embodiment is different from the cemented carbide joined body according to another embodiment of the present invention in that “the first metal member 2 and the third metal member 12 are included. The first plate member 32 is formed with a back hole 34 which is a through hole for introducing the forming raw material, and the second metal member 3 communicates with the back hole 34 so that the forming raw material has a honeycomb shape. The second plate-like member 33 is formed with a grid-like slit 35 for molding, and the second plate-like member 33 is formed on the surface side to be joined to the joining layer 4 of the first plate-like member 32. Grooves 36 are formed so as to overlap the slits 35 and communicate with the back holes 34, and the bonding layers 4 penetrate through the portions that overlap the back holes 34 and the grooves 36 of the first plate member 32. A cemented carbide joined body 31 having a structure in which a hole (through-hole in the joining layer) 37 is formed is provided. The die 200 for forming a honeycomb structure of the present embodiment may be composed of a cemented carbide joined body 31 or may include other elements. FIG. 6 is a schematic diagram showing another embodiment of the die for forming a honeycomb structure of the invention and showing a part of a cross section orthogonal to the first joining surface of the first plate-like member.

  The honeycomb structure forming die 200 of the present embodiment is a first plate of one embodiment (honeycomb structure forming die 100) of the honeycomb structure forming die of the present invention shown in FIGS. The third metal member 12 (see FIG. 7) is bonded to the “surface on which the bonding layer is not provided” of the shaped member 22 (first metal member 2). The first plate-like member 32 (see FIG. 7) of the honeycomb structure forming die 200 is the first plate-like member 22 (first metal member 2) of the honeycomb structure forming die 100 (see FIG. 7). 6) and the third metal member 12 (see FIG. 7) are combined. The honeycomb structure forming die 200 is a portion where the vicinity of the columnar portion 38 is easily worn, and a tungsten carbide-based cemented carbide needs to be used. Therefore, in the honeycomb structure forming die 200 of this embodiment, the vicinity of the columnar portion (first metal member 2) of the first plate-like member 32 is made of a tungsten carbide-based cemented carbide and the other portion (third The metal member 12) is made of stainless steel in which copper diffuses. Thereby, since the 3rd metal member 12 is easy to process, production efficiency can be improved. Moreover, since copper and stainless steel are cheaper than tungsten carbide base cemented carbide, manufacturing cost can be reduced.

  The thickness of the third metal member 12 is preferably thicker than the depth of the groove 36 (height of the columnar portion 38), and is 0.1 to 100 mm thicker than the depth of the groove 36 (height of the columnar portion 38). More preferably. Further, the thickness of the first metal member 2 is preferably 0.1 to 100 mm, and more preferably 10 to 50 mm.

(3) Manufacturing method of cemented carbide joined body:
Next, an embodiment of a method for producing a cemented carbide joined body of the present invention will be described. As shown in FIG. 8, the manufacturing method of the cemented carbide joined body according to the present embodiment includes a first metal member 42 containing a tungsten carbide-based cemented carbide and having a first joining surface 45, and a tungsten carbide-based material. A second metal member 43 containing a cemented carbide and having a second joining surface 46, and a thin plate 44 containing carbon and containing iron as a main component, the first joining surface 45 and the second joining surface. 46 are arranged so as to face each other with the thin plate 44 interposed therebetween, and copper alloy foils 47 are arranged between the first metal member 42 and the thin plate 44 and between the second metal member 43 and the thin plate 44, respectively. In this state, the first metal member 42 and the second metal member 43 are joined through the thin plate 44 by being laminated and pressed at a temperature of 700 to 1200 ° C. with a pressure of 0.1 to 5 MPa. It is. And thereby, one Embodiment (refer FIG. 1A and FIG. 1B) of the cemented carbide alloy joined body of the said invention can be obtained. Joining the first metal member 42 and the second metal member 43 via the thin plate 44 means that the first metal member 42 and the second metal member 43 are sandwiched between the thin plates 44, It means to join. FIG. 8 shows an embodiment of the method for producing a cemented carbide alloy body according to the present invention. ”Between the first metal member 42 and the thin plate 44 and between the second metal member 43 and the thin plate 44 with the copper alloy foil 47 interposed therebetween. It is a schematic diagram which shows each arrangement | positioning and shows a cross section orthogonal to the 1st joining surface of a 1st metal member.

  Although the 1st metal member 42 contains a cemented carbide alloy, it is preferable that a cemented carbide alloy is 100 mass% and consists of a cemented carbide alloy. Moreover, although the 2nd metal member 43 also contains a cemented carbide alloy, a cemented carbide alloy is 100 mass%, and it is preferable that it consists of a cemented carbide alloy.

  In this way, the first metal member 42 containing the cemented carbide and the second metal member 43 containing the cemented carbide are interleaved with the “thin plate 44 containing carbon and containing iron as a main component”. In addition, the copper alloy foil 47 is overlapped (laminated) between the “first metal member 42 and the thin plate 44 and between the second metal member 43 and the thin plate 44”. Thus, the first metal member 42 and the thin plate 44 are firmly joined and the second metal member 43 and the thin plate 44 are firmly joined by joining them under predetermined temperature and pressure conditions. At this time, when the first metal member 42 and the thin plate 44 are joined, the copper alloy foil 47 sandwiched between them diffuses into the thin plate 44, and the first metal member 42 and the thin plate 44 are joined together. Directly joined. When the second metal member 43 and the thin plate 44 are joined, the copper alloy foil 47 sandwiched therebetween diffuses into the thin plate 44, and the second metal member 43 and the thin plate 44 are directly connected. Be joined. Thereby, the first metal member 42 and the second metal member 43 are firmly bonded via the thin plate 44. In the cemented carbide joined body formed by joining the first metal member 42 and the second metal member 43 via the thin plate 44, the thin plate 44 serves as a bonding layer. That is, the copper alloy diffuses in “the thin plate 44 containing carbon and containing iron as a main component”, and becomes “a bonding layer in which iron is the main component and contains carbon and the copper alloy is diffused”.

  Further, even if the first metal member 42 and the second metal member 43 have defects such as the depression 7 of the first metal member 2 and the second metal member 3 shown in FIG. ”And the like are filled with the thin plate 44 at the time of joining, so that a cemented carbide joined body with few or no voids derived from“ dents ”can be produced. Thereby, the cemented carbide joined body obtained has a very high joining strength.

  The conditions such as the shape and size of the first metal member 42 and the second metal member 43 are the first metal member 2 and the second metal member in one embodiment of the cemented carbide joined body of the present invention. 3 (see FIGS. 1A and 1B) can be determined as appropriate.

  The thickness of the thin plate 44 is preferably 0.005 to 0.5 mm, more preferably 0.01 to 0.2 mm, and particularly preferably 0.01 to 0.1 mm. If the thickness is less than 0.005 mm, the amount of diffusion of the copper alloy in the bonding layer increases, and the bonding strength between the first metal member 42 and the second metal member 43 may decrease. If it is thicker than 0.5 mm, cobalt and carbon are likely to diffuse from the tungsten carbide-based cemented carbide alloy toward the bonding layer, so that the bonding strength may be lowered. The material of the thin plate 44 is preferably the same as the material of the “joining layer” in one embodiment of the cemented carbide joined body of the present invention.

  The carbon content of the thin plate 44 is preferably 0.06 to 2.14% by mass, more preferably 0.8 to 2.14% by mass, and 0.8 to 1.3% by mass. It is particularly preferred. Moreover, 0.030 mass% or less is preferable, as for the sulfur content of the thin plate 44, 0.019 mass% or less is more preferable, and 0.015 mass% or less is especially preferable. When sulfur content exceeds 0.030 mass%, the joining strength between a cemented carbide alloy and specific stainless steel will fall, and it may become easy to produce joining peeling.

  The thickness of the copper alloy foil 47 is preferably 0.001 to 0.1 mm, more preferably 0.003 to 0.05 mm, and particularly preferably 0.005 to 0.015 mm. If the thickness is less than 0.001 mm, defects such as the dent 7 cannot be filled and voids are formed, so that the bonding strength may be lowered. If the thickness is greater than 0.1 mm, the strength of the bonding layer is reduced, and the bonding strength between the first metal member 42 and the second metal member 43 may be reduced. Moreover, it is preferable that the copper content rate of copper alloy foil is 46 to 100%, and it is more preferable that it is 70 to 100%. When the copper content of the copper alloy foil is less than 100%, palladium (Pd), silicon (Si), tin (Sn), phosphorus (P), manganese (Mn), zinc (Zn), titanium (Ti ), Niobium (Nb), boron (B) and the like.

  A first metal member 42 containing cemented carbide and a second metal member 43 containing cemented carbide are sandwiched between two copper alloy foils 47 and 47 and the two copper alloy foils. After being superposed (laminated) with the “thin plate 44 containing carbon and containing iron as a main component” disposed between them, the layers are stacked (stacked), and then at a predetermined temperature and pressure condition, that is, 700 to The first metal member 42 and the second metal member 43 are joined by pressing at a temperature of 1200 ° C. and a pressure of 0.1 to 5 MPa. Thus, since it joins at the low temperature of 1200 degrees C or less and low pressure of 5 MPa or less, when joining the 1st metal member and the 2nd metal member, it can control that deformation arises, and the 1st It is possible to obtain a cemented carbide joined body with a high precision of the joined body of the metal member and the second metal member. The temperature at the time of joining is 700-1200 degreeC, and 900-1150 degreeC is preferable. If it is lower than 700 ° C., the bonding strength is lowered, which is not preferable. A temperature higher than 1200 ° C. is not preferable because the metal member and the bonding layer deteriorate. Moreover, the pressure at the time of joining is 0.1-5 MPa, and 0.5-3 MPa is preferable. If it is lower than 0.1 MPa, the bonding strength is unfavorable. When the pressure is higher than 5 MPa, the metal member is deformed and the accuracy of the joined body is deteriorated. The pressure at the time of joining is the direction in which the first metal member 42 and the second metal member 43 are perpendicular to the first joining surface 45 of the first metal member 42 and press each other. It is preferable to apply. Further, the time for bonding (the time for holding at a predetermined temperature and pressure condition) is preferably 1 minute to 1 hour, and more preferably 10 minutes to 45 minutes. If it is shorter than 1 minute, the bonding strength may be lowered. If it is longer than 45 minutes, the bonding layer may deteriorate and the production efficiency may decrease. Further, the atmosphere during bonding is preferably in a vacuum or an inert gas atmosphere, and the degree of vacuum is preferably 1 Pa or less, more preferably 0.1 Pa or less, and particularly preferably 0.01 Pa or less. In the case of maintaining at the predetermined temperature and pressure conditions, it is preferable to heat using a vacuum hot press bonding furnace or the like.

  Further, “a first metal member 42 containing a cemented carbide and a second metal member 43 containing a cemented carbide are made up of two copper alloy foils 47, 47 and these two copper alloy foils. Instead of “stacking in a state where a thin plate 44 containing carbon and containing iron as a main component” is placed in a position sandwiched between them, “a first metal member containing a cemented carbide” 42 and the second metal member 43 containing the cemented carbide are overlapped with a “thin plate 44 containing carbon and containing iron as a main component” in which a copper alloy is laminated on both sides. Good. The “thin plate 44 in which the copper alloy is bonded to both sides” may be a clad material formed by bonding a copper alloy foil to both sides of the thin plate 44 by rolling or the like, or a copper alloy on both sides of the thin plate 44. A member formed by plating may be used. The thickness range of the copper alloy laminated on both surfaces of the thin plate 44 is preferably a preferable range of the thickness of the copper alloy foil.

  Next, other embodiment of the manufacturing method of the cemented carbide joined body of this invention is described.

  As shown in FIG. 9, the manufacturing method of the cemented carbide joined body of the present embodiment includes a first metal member 42 containing a tungsten carbide-based cemented carbide and having a first joining surface 45, and a tungsten carbide-based material. A second metal member 43 containing a cemented carbide and having a second joining surface 46, and a thin plate 44 containing carbon and containing iron as a main component, the first joining surface 45 and the second joining surface. 46, and a copper alloy foil 47 is disposed between the first metal member 42 and the thin plate 44 and between the second metal member 43 and the thin plate 44, respectively. In the state where the third metal member forming metal plate 48 is disposed on the first bonding surface 45 side of the first metal member 42 with the copper alloy foil 47 interposed therebetween, the layers are laminated, and the temperature is 700 to 1200 ° C. The first metal member is pressed at a temperature of 0.1 to 5 MPa. 2 and the second metal member 43 as well as bonded via the sheet 44 is for joining the first metal member 43 and a third metal member forming metal plate 48. FIG. 9 shows another embodiment of the method for manufacturing a cemented carbide joined body according to the present invention, wherein the first metal member 42 and the second metal member 43 are made of a “thin plate containing carbon and containing iron as a main component”. 44 ”and a copper alloy foil 47 sandwiched between“ the first metal member 42 and the thin plate 44 and between the second metal member 43 and the thin plate 44 ”, respectively. The first metal member 42 and the third metal member forming metal plate 48 are overlapped with the copper alloy foil 47 sandwiched therebetween, and the respective arrangements are shown. FIG. 4 is a schematic diagram illustrating a cross section orthogonal to a first bonding surface 45 of 42.

  Other embodiments of the cemented carbide joined body of the present invention can be obtained by the method of manufacturing a cemented carbide joined body of the present embodiment.

  The thickness of the third metal member forming metal plate 48 is not particularly limited, and can be appropriately determined according to the use of the cemented carbide joined body to be produced.

  In the method for manufacturing a cemented carbide joined body according to the present embodiment, the third metal member forming metal plate 48 has at least one of three phase transformations of martensite transformation, bainite transformation, and pearlite transformation by cooling of the austenite phase. A plate-like metal plate made of a metal body capable of causing one phase transformation is preferable, and examples of stainless steel include SUS630. When the third metal member forming metal plate 48 and the first metal member are stacked with a copper alloy foil interposed therebetween and held at a predetermined temperature and a predetermined pressure, the third metal member forming metal plate The third metal member forming metal plate 48 and the first metal member are firmly joined while the copper alloy constituting the copper alloy foil is diffused in 48. The copper metal diffused in the third metal member forming metal plate 48 formed in this manner is the third metal member 12 (see FIG. 5) in another embodiment of the cemented carbide joined body of the present invention. 2).

  According to the method for manufacturing a cemented carbide joined body of the present embodiment, tungsten carbide-based cemented carbides are firmly joined to each other via a “thin plate” that becomes a joining layer after joining, and tungsten carbide-based cemented carbide (first Metal plate) and a plate-like metal plate composed of a metal body capable of causing at least one of the three phase transformations of martensitic transformation, bainite transformation, and pearlite transformation by cooling the austenitic phase (third). The metal member forming metal plate) can be firmly joined.

  In the method for manufacturing a cemented carbide alloy body according to the present embodiment, the temperature conditions, pressure conditions, and time at the time of bonding are the same as those in the embodiment of the method for manufacturing the cemented carbide alloy body according to the present invention. Is preferred.

  The thickness of the copper alloy foil used in the method for manufacturing a cemented carbide alloy body of the present embodiment is in the same range as the thickness of the copper alloy foil in one embodiment of the method for manufacturing a cemented carbide alloy body of the present invention. Is preferred.

(4) Manufacturing method of die for forming a honeycomb structure:
Next, the manufacturing method of one embodiment of the die for forming a honeycomb structure of the present invention shown in FIGS. 3 to 6 will be described.

  First, a lattice-like groove portion 26 is formed on one surface (first bonding surface) of a first plate-like member (first metal member) 22 containing a tungsten carbide base cemented carbide (step (1). )). As a method for forming the groove portion, for example, a conventionally known method such as a grinding process using a diamond grindstone, an end mill process, an electric discharge process (EDM process), or a laser process can be suitably used.

  About the width | variety of the groove part 26, it is set as the width of the groove part of one Embodiment of the die for honeycomb structure formation of the said invention. The distance between the adjacent groove portions 26 can be appropriately determined according to the shape of the honeycomb structure to be formed by the honeycomb structure forming die to be manufactured.

  Before forming the groove portion 26 on one surface (first bonding surface) of the first plate-like member 22 or after forming the groove portion 26, from the other surface of the first plate-like member 22 to the groove portion 26. It is preferable to form the back hole 24 which communicates. The back hole 24 is preferably formed at the intersection of the groove 26. When manufacturing the honeycomb structure forming die 100 of the present embodiment, the back holes 24 are formed at every other position among the intersections of the grooves 26 formed in a lattice shape. The back hole 24 is preferably formed in parallel to the thickness direction of the first plate-like member 22. Although there is no restriction | limiting in particular about the method of forming a back hole, For example, it is preferable to use the conventionally well-known method by machining, such as electrolytic processing (ECM processing), electric discharge processing (EDM processing), laser processing, a drill, etc. it can.

  The back hole 24 may penetrate between both surfaces of the first plate-like member 22, does not reach the first joint surface 5 of the first plate-like member 22, and communicates with the groove portion 26. It may be formed so as to.

  In the manufacturing method of the honeycomb structure forming die of the present embodiment, the back hole is not formed in the step (1), and the subsequent steps, for example, the first plate-like member and the second plate are formed. In the step after joining the plate-like member, the back hole can be formed.

  Next, a first plate-like member 22, a thin plate containing carbon and containing iron as a main component, and a second plate-like member 23 containing a tungsten carbide base cemented carbide (a cemented carbide) are laminated. The first plate-like member and the second plate-like member are joined with a thin plate sandwiched between them by pressing at a temperature of 700 to 1200 ° C. and a pressure of 0.1 to 5 MPa (step ( 2)). In step (2), at the time of the lamination, the first joint surface of the first plate-like member 22 and one surface (second joint surface) of the second plate-like member 23 face each other with the thin plate interposed therebetween. In addition, the copper alloy foils are arranged between the first plate member and the thin plate and between the second plate member and the thin plate, respectively. Therefore, the “first plate member, copper alloy foil, thin plate, copper alloy foil, second plate member” are laminated in this order.

  In step (2), after the lamination, the first plate member and the second plate member are pressed through a thin plate by pressing at a temperature of 700 to 1200 ° C. and a pressure of 0.1 to 5 MPa. And join. As a result, the two copper alloy foils diffuse into the thin plate, and the first plate member and the second plate member are firmly bonded via the thin plate. Furthermore, “a thin plate containing carbon and containing iron as a main component” and “a plate-like member containing a tungsten carbide-based cemented carbide” are laminated and bonded together with a copper alloy foil sandwiched therebetween. Sometimes, it is possible to firmly bond at a low temperature of 1200 ° C. or lower and a low pressure of 5 MPa or lower. Therefore, when joining what laminated | stacked in order of "a 1st plate-shaped member, copper alloy foil, a thin plate, a copper alloy foil, a 2nd plate-shaped member" as mentioned above, low temperature of 1200 degrees C or less, In addition, it is possible to firmly bond at a low pressure of 5 MPa or less.

  In the manufacture of a die for forming a honeycomb structure, when a first plate member in which a back hole and a groove are formed and a second plate member in which a slit is formed are joined, a very high accuracy is obtained. Required. When joining the first plate-like member and the second plate-like member, if the positions of the back hole 24 and the groove portion 26 that are strictly determined are slightly deviated from the design values, the produced honeycomb structure is formed. When a honeycomb structure is manufactured using a die, a desired honeycomb structure may not be obtained, or equipment problems may occur. And when the 1st plate-shaped member and the 2nd plate-shaped member are joined at high temperature and high pressure, the back hole 24 and the groove part 26 in the 2nd plate-shaped member will deform | transform, and position shift will arise. was there. Therefore, the above-described method for manufacturing the honeycomb structure forming die of the present embodiment can join the first plate-like member and the second plate-like member under conditions of low temperature and low pressure. This is an extremely effective method for preventing the positional deviation between the first plate-like member and the second plate-like member.

  Each condition of temperature, pressure, and time when the first plate-like member and the second plate-like member are joined via a thin plate is one embodiment of the method for producing a cemented carbide joined body of the present invention. In the form, it is preferable that the conditions are the same as when the first metal member and the second metal member are joined via a thin plate.

  In the manufacturing method of the die for forming a honeycomb structure of the present embodiment, the joined first plate-like member and second plate-like member are at least at a temperature drop rate of 0.1 to 100 ° C./min. It is preferable to cool to 500 ° C. Thereby, deformation of the die for forming a honeycomb structure can be further suppressed.

  Next, the second plate-like member 23 communicates with the groove 26 from the surface on the opposite side to the bonding surface with the thin plate (second bonding surface 6) corresponding to the shape (formation pattern) of the groove 26. A slit 25 is formed to obtain an embodiment (honeycomb structure forming die 100) of the honeycomb structure forming die of the present invention (step (3)).

  Although there is no restriction | limiting in particular about the method of forming a slit in the surface of a 2nd plate-shaped member, For example, conventionally well-known methods, such as a grinding process with a diamond grindstone, electrical discharge machining (EDM process), and laser processing, should be used suitably. Can do. Further, the honeycomb structure forming die 100 shown in FIG. 3 has a lattice-like shape in which the shape of the slits 25 (formation pattern) is a square, but in the manufacturing method of the honeycomb structure forming die of the present embodiment, The shape of the slit 25 formed in the second plate-like member is not limited to a square lattice shape, and may be another polygonal lattice shape.

  The width of the slit formed in the second plate-shaped member is preferably set to be the width of the slit in the embodiment of the honeycomb structure forming die of the present invention.

  Next, a manufacturing method of another embodiment of the die for forming a honeycomb structure of the present invention shown in FIG. 7 will be described.

  A manufacturing method of another embodiment of the die for forming a honeycomb structure of the present invention is the manufacturing method of the embodiment of the die for forming a honeycomb structure of the present invention, wherein the first plate-like member is a first metal. The member and the third metal member forming metal plate are joined and formed. Here, the third metal member forming metal plate is a third metal member forming metal plate in another embodiment of the cemented carbide joined body of the present invention. That is, the manufacturing method of another embodiment of the die for forming a honeycomb structure of the present invention is the first plate shape in step (2) of the manufacturing method of the embodiment of the die for forming a honeycomb structure of the present invention. “First metal member, copper alloy foil and third metal member forming metal plate” to be the member 22, a thin plate containing carbon and containing iron as a main component, and a first containing a tungsten carbide base cemented carbide The two plate-like members 23 are stacked and pressed at a temperature of 700 to 1200 ° C. with a pressure of 0.1 to 5 MPa, whereby the first metal member and the second plate-like member are interposed through a thin plate. And joining the first metal member and the third metal member forming metal plate (step (2 ′)). In the step (2 ′), at the time of the lamination, the first joining surface of the first metal member and one surface (second joining surface) of the second plate-like member 23 face each other with the thin plate interposed therebetween. In addition, a copper alloy foil is disposed between the first metal member and the thin plate, and between the second plate-like member and the thin plate, respectively, and the first metal member and the third plate are further disposed. It is set as the state which has arrange | positioned copper alloy foil between the metal plates for metal member formation. Therefore, the third metal member forming metal plate, the copper alloy foil, the first metal member, the copper alloy foil, the thin plate, the copper alloy foil, and the second plate member are laminated in this order.

  While joining the first metal member and the third metal member forming metal plate, and joining the first metal member and the second plate member through the thin plate, the temperature, pressure and time Each condition is the same as each condition when joining a 1st metal member and a 2nd metal member through a thin plate in one embodiment of a manufacturing method of a cemented carbide joined body of the above-mentioned present invention. Is preferred.

  In the manufacturing method of another embodiment of the die for forming a honeycomb structure of the present invention, a copper alloy foil is disposed between the first metal member and the third metal member forming metal plate, The first metal member and the third metal member forming metal plate are joined at a temperature and a predetermined pressure to form a first plate-like member composed of the first metal member and the third metal member. . A first metal member containing a cemented carbide and a third metal member forming metal plate made of carbon steel, alloy steel, stainless steel, or the like are laminated with a copper alloy foil interposed therebetween, When the temperature and the predetermined pressure are maintained, the first metal member and the third metal member forming metal plate are firmly joined while the copper alloy foil is diffused into the third metal member forming metal plate.

  In the manufacturing method of another embodiment of the die for forming a honeycomb structure of the present invention, the first plate member is formed from the first metal member and the third metal member forming metal plate. The thickness of the third metal member forming metal plate is preferably greater than the depth of the groove to be formed (the height of the columnar part to be formed), and the depth of the groove (the height of the columnar part). More preferably, it is 0.1 to 100 mm thicker. Moreover, it is preferable that the thickness of a 1st metal member is 0.1-100 mm, and it is still more preferable that it is 10-50 mm.

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples.

Example 1
First, a plate-like first metal member having a first joining surface, a plate-like second metal member having a second joining surface, and a thin plate made of stainless steel (SUS) are used. The joining surface and the second joining surface are opposed to each other with the thin plate interposed therebetween, and pure copper foil (99.9%) is provided between the first metal member and the thin plate and between the second metal member and the thin plate. ) Were placed in a stacked state. Each of the first metal member and the second metal member was obtained by processing a tungsten carbide base cemented carbide into a plate shape. The first metal member has a rectangular plate shape of (length: 40 mm) × (width: 40 mm) × (thickness: 20 mm), and the first metal member is (length: 40 mm) × (width: 40 mm) X (thickness: 20 mm) square plate shape. Further, the stainless steel that is a material of the thin plate is more specifically SUS304H. Composition: C; 0.06 to 0.08, Si; 1.0 or less, Mn; 2.0 or less, P; 0.045 or less, S; 0.03 or less, Ni; 8.0 to 10.5 , Cr; 18-20, Fe; balance. The thin plate was a rectangular plate shape of (vertical: 40 mm) × (horizontal: 40 mm) × (thickness: 0.2 mm). Each copper alloy foil was formed into a rectangular foil shape of (length: 40 mm) × (width: 40 mm) × (thickness: 10 μm).

  The above laminate is held under conditions of a temperature of 1100 ° C. and a pressure of 0.6 MPa at a vacuum of 0.01 Pa or less for 0.75 hours, and then cooled to 100 ° C. at a temperature drop rate of about 5 ° C./min. Thus, the first metal member and the second metal member were joined via a thin plate to produce a cemented carbide joined body.

  About the obtained cemented carbide alloy joined body, the “bending strength (MPa)” was measured by the method shown below, thereby confirming the joining strength between the first metal member and the second metal member. The results are shown in Table 1. In Table 1, “Thin plate material” indicates the material of the thin plate. “Thin plate thickness” indicates the thickness of the thin plate. “Pressure” indicates the pressure when the first metal member and the second metal member are joined via a thin plate.

(Measurement method of bending strength)
A test piece was cut out to 3.2 mm × 4.2 mm × 40 mm from the obtained cemented carbide joined body (approximately 40 mm × 40 mm × 40 mm) so that the joint surface is in the center of 40 mm, and surface finishing was performed by surface grinding. And adjust the dimensions to 3 mm × 4 mm × 40 mm. Thereafter, a three-point bending test jig with a fulcrum distance of 30 mm is installed in the strength tester, and a three-point bending (bending) test is performed so that the joint surface has a fracture surface. The obtained maximum stress is defined as bonding strength (bending strength). As the strength tester, “Universal Material Tester 5581” manufactured by INSTRON was used.

(Examples 2 to 5)
A cemented carbide joined body was produced in the same manner as in Example 1 except that the thickness of the thin plate was changed as shown in Table 1. The bending strength of the obtained cemented carbide alloy joined body was measured in the same manner as in Example 1. The results are shown in Table 1.

(Examples 6 to 10)
Carbide as in Example 1 except that the material of the thin plate was carbon steel for tools (SK material) and the thickness of the thin plate was changed in the range of 0.01 to 0.2 mm as shown in Table 1. An alloy joined body was produced. The SK material has a composition of C; 0.9 to 1.1, Si; 0.1 to 0.35, Mn 0.1 to 0.5, P; 0.03 or less, S; 0.03 or less, Cu; 0.25 or less, Ni; 0.25 or less, Cr; 0.3 or less, Fe; balance. The bending strength of the obtained cemented carbide alloy joined body was measured in the same manner as in Example 1. The results are shown in Table 1.

(Example 11)
A cemented carbide joined body was produced in the same manner as in Example 1 except that the material of the thin plate was alloy steel for tools (SKS material) and the thickness of the thin plate was 0.03 mm. The SKS material has a composition of C; 1.1 to 1.3, Si; 0.35 or less, Mn 0.5 or less, P; 0.03 or less, S; 0.03 or less, Cu; 0.25 or less, Ni 0.25 or less, Cr; 0.2 to 0.5, Fe; balance. The bending strength of the obtained cemented carbide alloy joined body was measured in the same manner as in Example 1. The results are shown in Table 1.

(Example 12)
A cemented carbide joined body was produced in the same manner as in Example 1 except that the thickness of the thin plate was 0.005 mm. The bending strength of the obtained cemented carbide alloy joined body was measured in the same manner as in Example 1. The results are shown in Table 1.

(Comparative Examples 1 and 2)
A cemented carbide joined body was produced in the same manner as in Example 1 except that the thin plate and the copper alloy foil were not used and the pressure was changed as shown in Table 1. The bending strength of the obtained cemented carbide alloy joined body was measured in the same manner as in Example 1. The results are shown in Table 1.

(Comparative Example 3)
A cemented carbide joined body was produced in the same manner as in Example 1 except that a thin plate was not used, “Cu—Mn—Co brazing” having a thickness of 0.2 mm was used, and the joining temperature was set to 1070 ° C. The bending strength of the obtained cemented carbide alloy joined body was measured in the same manner as in Example 1. The results are shown in Table 1.

(Comparative Example 4)
A cemented carbide joined body was produced in the same manner as in Example 1 except that a thin plate was not used, “silver brazing (BAg-8)” having a thickness of 0.05 mm was used, and the joining temperature was 800 ° C. The bending strength of the obtained cemented carbide alloy joined body was measured in the same manner as in Example 1. The results are shown in Table 1.

(Comparative Example 5)
A cemented carbide similar to Example 1 except that a thin plate is not used, “silver brazing (BAg-8)” having a thickness of 0.05 mm is used, the joining temperature is 800 ° C., and the joining pressure is 2.5 MPa. A joined body was produced. The bending strength of the obtained cemented carbide alloy joined body was measured in the same manner as in Example 1. The results are shown in Table 1.

  From Table 1, it can be seen that a strong bending strength (joining strength) of 700 MPa or more can be obtained when the thickness of the thin plate is 0.01 to 0.2 mm. Further, from Comparative Examples 1 and 2, when the thin plate and the copper alloy foil were not used, although the result that the joining strength was improved by increasing the joining pressure was obtained, the strength was not sufficient. Furthermore, it can be seen from Comparative Examples 3, 4, and 5 that high bonding strength is not obtained even by “brazing” with “Cu—Mn—Co brazing” and “silver brazing (BAg-8)”.

  The cemented carbide joined body of the present invention can be suitably used as a die for forming a honeycomb structure, a precision mold, a die or the like. The die for forming a honeycomb structure of the present invention forms a catalyst carrier utilizing catalytic action of an internal combustion engine, a boiler, a chemical reaction device, a fuel cell reformer, a particulate collection filter in exhaust gas, and the like. Can be used. The manufacturing method of the cemented carbide bonded body of the present invention is used for manufacturing the cemented carbide bonded body of the present invention.

1: cemented carbide joined body, 2: first metal member, 3: second metal member, 4: joining layer, 5: first joining surface, 6: second joining surface, 7: depression, 11 , 21, 31: cemented carbide joined body, 12: third metal member, 13: third joint surface, 14: copper, 22, 32: first plate member, 23, 33: second plate 24, 34: Back hole, 25, 35: Slit, 26, 36: Groove, 27, 37: Through hole in bonding layer, 28, 38: Columnar part, 29: Cell block, 42: First metal Member, 43: second metal member, 44: thin plate, 45: first joint surface, 46: second joint surface, 47: thin copper, 48: third metal member forming metal plate, 100, 200 : Honeycomb structure forming die, L: depth of groove (columnar height), S: region.

Claims (8)

A first metal member containing a tungsten carbide-based cemented carbide and having a first joint surface;
A bonding layer bonded to the first bonding surface of the first metal member and containing iron as a main component and containing carbon and copper diffusing;
A tungsten carbide-based cemented carbide comprising a second bonding surface, wherein the second bonding surface is bonded to a surface of the bonding layer opposite to a surface to which the first metal member is bonded. A cemented carbide joined body comprising the second metal member to be contained.   The cemented carbide joined body according to claim 1, wherein a material of the joining layer is a copper alloy diffused in at least one selected from the group consisting of carbon steel, alloy steel, and stainless steel. The first metal member has a plate shape in which one surface is the first bonding surface, the second metal member has a plate shape in which one surface is the second bonding surface,
Austenite having a third bonding surface bonded to the surface of the first metal member opposite to the first bonding surface and having a third bonding surface bonded to the first metal member, in which a copper alloy has diffused inside. 2. A plate-like third metal member comprising a metal body capable of causing at least one of the three phase transformations of martensitic transformation, bainite transformation, and pearlite transformation by cooling of the phase. Or the cemented carbide joined body of 2. The first metal member is a first plate-like member in which a back hole which is a through hole for introducing a forming raw material is formed;
The second metal member is a second plate-like member in communication with the back hole and formed with a lattice-like slit for forming a forming raw material into a honeycomb shape;
A groove portion that is formed in a lattice shape so as to overlap the slit of the second plate-shaped member and communicates with the back hole is formed on the surface of the first plate-shaped member on the side where the bonding layer is bonded. Formed,
The cemented carbide joined body according to claim 1 or 2, wherein a through hole is formed in a portion of the joining layer that overlaps at least the slit of the second plate-like member. The first metal member and the third metal member are first plate-like members in which a back hole which is a through hole for introducing a forming raw material is formed;
The second metal member is a second plate-like member in communication with the back hole and formed with a lattice-like slit for forming a forming raw material into a honeycomb shape;
A groove portion that is formed in a lattice shape so as to overlap the slit of the second plate-shaped member and communicates with the back hole is formed on a surface side of the first plate-shaped member that is bonded to the bonding layer. ,
The cemented carbide joined body according to claim 3, wherein a through hole is formed in at least a portion of the joining layer overlapping the slit of the second plate-like member.   The cemented carbide joined body according to any one of claims 1 to 5, wherein a thickness of the joining layer is 0.005 to 0.5 mm.   A die for forming a honeycomb structure comprising the cemented carbide joined body according to claim 4 or 5. A first metal member containing a tungsten carbide-based cemented carbide and having a first bonding surface, a second metal member containing a tungsten carbide-based cemented carbide and having a second bonding surface, and carbon A thin plate containing iron as a main component so that the first joint surface and the second joint surface face each other with the thin plate interposed therebetween, and between the first metal member and the thin plate And in a state where a copper thin film is disposed between the second metal member and the thin plate,
The first metal member and the second metal member are joined via the thin plate by pressing at a temperature of 700 to 1200 ° C. with a pressure of 0.1 to 5 MPa. A method for producing a cemented carbide joined body for producing the cemented carbide joined body according to any one of the above.

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