JPWO2015068782A1 - Manufacturing method of honeycomb structure - Google Patents

Abstract

A honeycomb structure made of ceramic having at least a first end face, a second end face, a first side wall, and a second side wall, and having a plurality of flow paths partitioned by an inner wall and extending from the first end face to the second end face, From the first side wall, a first opening formed in the first side wall or the second side wall and a plurality of inner walls facing the first opening by laser light passing through a water flow of a water jet. A connection hole including a second opening that is formed and connects the plurality of flow paths is formed.

Description

  The present invention relates to a method for manufacturing a honeycomb structure made of ceramic.

  The honeycomb structure is composed of a large number of flow paths whose interior is partitioned by inner walls. When a fluid passes through the flow path of the honeycomb structure, heat, a substance, and the like can be moved through the inner wall, so that it is widely used as a filter and a heat exchanger.

  In particular, a honeycomb structure made of ceramic is excellent in heat resistance and chemical stability, and thus is used in an exhaust gas filter, a heat exchanger, and the like used in a high temperature and corrosive environment. Patent Document 1 is a high-temperature heat exchanger including an element made of a porous silicon carbide sintered body that exchanges heat between a fluid flowing through the inside and a fluid existing outside. A high temperature heat exchanger is described in which the element is a honeycomb structure having a plurality of cells extending in the longitudinal direction. It is described that a heat exchanger using such a honeycomb structure is excellent in strength and can efficiently exchange heat between fluids having different temperatures.

Japanese Unexamined Patent Publication No. 6-345555

The ceramic is used in the honeycomb structure because the atoms constituting the material are strongly bonded by a covalent bond and have high strength, heat resistance, and corrosion resistance. On the other hand, the ceramic material becomes a hard and brittle material due to such a feature of the covalent bond.
For this reason, a honeycomb structure made of ceramic is manufactured by a simple forming method such as extrusion, and has a simple shape in which flow paths are arranged in one direction. Because of this shape, the parts to which the honeycomb structure is applied are designed on the premise of channels arranged in one direction, and the degree of freedom in designing the honeycomb structure is small.

  The present invention provides a method for manufacturing a honeycomb structure made of ceramic that exceeds the range of application of such a conventional honeycomb structure, imparts a new function to the honeycomb structure, and can handle a new fluid flow. With the goal.

  In the present specification, the cross section of the honeycomb structure indicates a cross section cut in the depth direction of the connection hole along the flow path. For example, FIG. 17 describes in detail the cutting position of FIG. 3, which is a cross-sectional view of FIG. 4 is a sectional view of FIG. 1, FIG. 6 is a sectional view of FIG. 5, and FIG. 8 is a sectional view of FIG.

  The solving means of the present invention for solving the above-mentioned problems has at least a first end face, a second end face, a first side wall, and a second side wall, is partitioned by an inner wall and extends from the first end face to the second end face. A first opening formed in the first side wall or the second side wall by a laser beam passing through the water flow of the water jet from the first side wall to the honeycomb structure made of ceramic having a plurality of flow paths. And a second opening that is formed on a plurality of inner walls facing the first opening and connects a plurality of flow paths, and forming a connection hole.

  In the honeycomb structure obtained by the manufacturing method of the present invention, the flow path extends from the first end face toward the second end face. Moreover, the side surface of the honeycomb structure has a first side wall and a second side wall, and the second side wall is located opposite to the first side wall.

  According to the honeycomb structure obtained by the manufacturing method of the present invention, unlike the conventional honeycomb structure in which the flow path extends in one direction, a fluid flow can be created in the direction across the honeycomb structure. Further, in such a honeycomb structure, since the first opening and the second opening are formed inside the first opening, not only the flow path located on the outermost periphery but also the flow path on the inner side. A fluid flow can be created. In addition, since the second opening is formed at a position facing the first opening, the fluid can be moved to the flow path inside the second opening in the shortest distance, and the fluid flows efficiently. be able to.

  Such a honeycomb structure has a first opening formed in the first side wall or the second side wall by the laser beam passing through the water flow of the water jet from the first side wall, and the first side wall. It can be obtained by a manufacturing method in which a connection hole is formed, which is formed on a plurality of inner walls facing the opening and formed by a second opening that connects a plurality of flow paths. Conventional laser light has a high processing ability in the vicinity of the focal point. However, since the connection hole described in the present invention is deep with respect to the opening, it is difficult to process a deep part. Since the laser beam travels through the water stream, the laser beam can be processed without being diffused, and a connection hole that connects the channels of the honeycomb structure can be formed.

Furthermore, the manufacturing method of the honeycomb structure of the present invention is preferably the following mode.
(1) A laser beam is attenuated by inserting a light diffusion medium into a part of the flow path, and the connection hole having a bottom is formed.

The method for manufacturing a honeycomb structure of the present invention attenuates laser light by inserting a light diffusion medium into a part of the flow path using a laser processing machine combined with a water flow of a water jet having high processing performance. And forming the connection hole having a bottom. Thus, it can process without penetrating the bottom of a connection hole.
Processing while leaving the bottom of the connection hole can be realized by scattering the laser light by a light diffusion medium inserted at a predetermined location and dispersing light energy. By inserting the light diffusing medium at a predetermined location, the laser light is weakened below it and cannot be processed, and a connection hole having a bottom can be formed.

(2) The light diffusion medium is a light-transmitting rod having a curved surface, devitrified glass, glass having bubbles, or water.
A light-transmitting substance with a curved surface is not heated by laser light, and light is scattered on the curved surface, so that the ability to process laser light can be reduced and connected without penetrating. It can be processed leaving the bottom of the hole.

  In addition, devitrified glass has a phase-separated interior even if the surface is not curved, so that light is easily scattered, the ability to process laser light can be reduced, and the bottom is formed without penetrating. be able to. Moreover, it can process by leaving the bottom of a connection hole by filling water in a predetermined location. When filled with water, a large amount of bubbles are generated by boiling water heated by mixing and processing with a water jet stream. For this reason, the laser beam is rapidly attenuated in the filled water, and processing can be performed while leaving the bottom of the connection hole.

(3) After forming the connection hole, sealing portions are respectively formed on the first end surface and the second end surface in the flow path having the first or second opening.

  By forming sealing portions on the first end face and the second end face respectively in the flow path having the first or second opening, the flow path having the first or second opening becomes the first flow path. The first end face and the second end face each have a sealing portion, and the flow path having the first or second opening constitutes a first space by being connected by the connection hole, and the first end face The flow path without the opening and the second opening constitutes a second space extending from the first end surface to the second end surface, and the first space and the second space are separated from each other by the inner wall. A honeycomb structure can be obtained.

  In such a honeycomb structure, the flow path having the first or second opening has the sealing portions on the first end face and the second end face, respectively, thereby forming the flow path having the first or second opening. Intrusion of fluid from the first end face and the second end face can be prevented. Further, the first space can be configured by connecting the flow paths having the first or second openings through the connection holes. Furthermore, since the first space is separated by the inner wall from the second space extending from the first end surface to the second end surface, which is constituted by the flow path without the first opening and the second opening, the first space flows through the first space. The fluid (first fluid) and the fluid flowing in the second space (second fluid) are not in direct contact. For this reason, by having functions such as heat transfer and filtration on the inner wall, it can be used as a honeycomb structure having functions such as a heat exchanger, a filter, and separation.

(4) The ceramic is made of silicon carbide, silicon-impregnated silicon carbide, alumina, cordierite, silicon nitride, aluminum nitride, or zirconia.
When the honeycomb structure is made of silicon carbide, silicon-impregnated silicon carbide, alumina, cordierite, silicon nitride, aluminum nitride, or zirconia, a high-strength honeycomb structure having heat resistance and corrosion resistance can be obtained. However, these ceramics are poor in workability and can be obtained by a method for manufacturing a honeycomb structure using a laser processing machine in combination with a water flow of a water jet having high processing performance according to the present invention.

  According to the present invention, not only the flow path formed by the inner wall of the honeycomb structure but also the fluid flow can be drawn in the direction crossing the flow path, so that a new function not provided in the conventional honeycomb structure is provided. The manufacturing method of the honeycomb structure which can be provided can be provided.

The perspective view of the honeycomb structure of Embodiment 1 to which the manufacturing method of the present invention is applied. It is a perspective view of a modification of the honeycomb structure of Embodiment 1 to which the manufacturing method of the present invention is applied, (a) shows a honeycomb structure having one slit-like connection hole, (b), The honeycomb structure in which slit-like connection holes are formed in all the channels facing the first side wall is shown. FIG. 2 is a cross-sectional view of the honeycomb structure of Embodiment 1 to which the manufacturing method of the present invention is applied, where (a) is a cross-sectional view taken along line AA ′ of FIG. 1 and (b) is a cross-sectional view taken along line BB ′ of FIG. is there. FIG. 6 is a cross-sectional view of a modified example of the connection hole of the honeycomb structure of Embodiment 1 to which the manufacturing method of the present invention is applied, corresponding to the cross-sectional view taken along the line AA ′ of FIG. The connection hole which is V-shaped is shown, (b) shows the connection hole aligned so that one side of the 1st and 2nd opening becomes perpendicular, (c) shows the 1st opening and the 2nd A connection hole having the same opening length and penetrating the first side wall and the second side wall is shown. (D) is a connection in which a connection hole is formed from the first side wall and the second side wall and shares the inner wall as the bottom. A hole is shown, (e) shows a connection hole whose inside is larger. It is a perspective view of the modification of the honeycomb structure of Embodiment 1 which applies the manufacturing method of the present invention, (a) shows the honeycomb structure which has four circular connection holes, and (b) shows 4 One group of connection holes is a honeycomb structure including five circular connection holes, and (c) is a honeycomb structure having one circular connection hole. Indicates. FIG. 6 is a cross-sectional view of a modification of the honeycomb structure of FIG. 5, (a) is a cross-sectional view taken along the line CC ′ of FIG. 5 (a), (b) is a cross-sectional view taken along the line EE ′ of FIG. FIG. 5C is a sectional view taken along the line DD ′ of FIG. 5A and a sectional view taken along the line FF ′ of FIG. (A) is a perspective view of the honeycomb structure of Embodiment 2 to which the manufacturing method of the present invention is applied. (B) is a perspective view of the modification of the honeycomb structure of Embodiment 2 to which the manufacturing method of the present invention is applied. It is sectional drawing of the honeycomb structure of Embodiment 2 which applies the manufacturing method of this invention, (a) is GG 'sectional drawing of Fig.7 (a), (b) is I-- of FIG.7 (b). I 'sectional drawing, (c) is HH' sectional drawing of Fig.7 (a), and JJ 'sectional drawing of FIG.7 (b). It is explanatory drawing which shows an example of the manufacturing method of the connection hole of the honeycomb structure which concerns on this invention, and a connection hole is an example comprised by 1st and 2nd opening of slit shape with the same length, (a ) Shows an explanatory diagram using a cross-sectional view, and (b) shows an explanatory diagram using a side view. It is explanatory drawing which shows an example of the manufacturing method of the connection hole of the honeycomb structure which concerns on this invention, a connection hole is slit shape, 1st opening is longer than 2nd opening, and 2nd opening is 1st. It becomes longer toward the opening. It is explanatory drawing which shows an example of the manufacturing method of the connection hole of the honeycomb structure which concerns on this invention, a connection hole is slit shape, 1st opening is longer than 2nd opening, and 2nd opening is 1st. (A) shows a step of forming first and second openings having the same length, and (b) shows a laser after the step (a). A process of scanning while appropriately tilting light is shown. It is explanatory drawing which shows an example of the manufacturing method of the connection hole of the honeycomb structure which concerns on this invention, a connection hole is slit shape, 1st opening is shorter than 2nd opening, and 2nd opening is 1st. (A) shows a process of forming first and second openings having the same length, and (b) shows a laser after the process of (a). A process of scanning while appropriately tilting light is shown. It is explanatory drawing which shows an example of the method of manufacturing the connection hole of the honeycomb structure which concerns on this invention with a laser beam, (a) is inserting the light-transmitting stick | rod which has a curved surface in the flow path. . In (b), devitrified glass is inserted in the flow path. In (c), water is put in the flow path. It is explanatory drawing which shows an example of the method of manufacturing the connection hole of the honeycomb structure which concerns on this invention with the laser beam guide | induced by the water flow (water jet), (a) is light transmission which has a curved surface in a flow path A sex stick is inserted. In (b), devitrified glass is inserted in the flow path. In (c), water is put in the flow path. The external appearance photograph (a) of the honeycomb structure of the Example which concerns on this invention, and its explanatory drawing (b). The cross-sectional photograph (a) of the connection hole of the honeycomb structure of the Example which concerns on this invention, and its explanatory drawing (b). It is explanatory drawing which shows in detail the cutting position and cutting | disconnection direction of FIG. 3 which are sectional drawings of FIG.

  In the present specification, the cross section of the honeycomb structure indicates a cross section cut in the depth direction of the connection hole along the flow path. For example, FIG. 17 describes in detail the cutting position of FIG. 3, which is a cross-sectional view of FIG. 4 is a sectional view of FIG. 1, FIG. 6 is a sectional view of FIG. 5, and FIG. 8 is a sectional view of FIG.

  The method for manufacturing a honeycomb structure of the present invention includes at least a first end surface, a second end surface, a first side wall, and a second side wall, and is partitioned by an inner wall and extends from the first end surface to the second end surface. A honeycomb structure made of ceramic having a path, a first opening formed in the first side wall or the second side wall by laser light passing through the water flow of the water jet from the first side wall, A connection hole including a second opening formed on a plurality of inner walls facing the first opening and connecting a plurality of flow paths is formed.

  In the honeycomb structure obtained by the manufacturing method of the present invention, the flow path extends from the first end face toward the second end face. Moreover, the side surface of the honeycomb structure has a first side wall and a second side wall, and the second side wall is located opposite to the first side wall.

  According to the honeycomb structure obtained by the manufacturing method of the present invention, unlike the conventional honeycomb structure in which the flow path extends in one direction, a fluid flow can be created in the direction across the honeycomb structure. Further, in such a honeycomb structure, since the first opening and the second opening are formed inside the first opening, not only the flow path located on the outermost periphery but also the flow path on the inner side. A fluid flow can be created. In addition, since the second opening is formed at a position facing the first opening, the fluid can be moved to the flow path inside the second opening in the shortest distance, and the fluid flows efficiently. be able to.

  Such a honeycomb structure has a first opening formed in the first side wall or the second side wall by the laser beam passing through the water flow of the water jet from the first side wall, and the first side wall. It can be obtained by a manufacturing method in which a connection hole is formed, which is formed on a plurality of inner walls facing the opening and formed by a second opening that connects a plurality of flow paths. Conventional laser light has a high processing ability in the vicinity of the focal point. However, since the connection hole described in the present invention is deep with respect to the opening, it is difficult to process a deep part. Since the laser beam travels through the water stream, the laser beam can be processed without being diffused, and a connection hole that connects the channels of the honeycomb structure can be formed.

  In the method for manufacturing a honeycomb structured body of the present invention, it is preferable to attenuate the laser light by inserting a light diffusion medium into a part of the flow path to form the connection hole having a bottom.

The method for manufacturing a honeycomb structure of the present invention attenuates laser light by inserting a light diffusion medium into a part of the flow path using a laser processing machine combined with a water flow of a water jet having high processing performance. And forming the connection hole having a bottom. Thus, it can process without penetrating the bottom of a connection hole.
Processing while leaving the bottom of the connection hole can be realized by scattering the laser light by a light diffusion medium inserted at a predetermined location and dispersing light energy. By inserting the light diffusing medium at a predetermined location, the laser light is weakened below it and cannot be processed, and a connection hole having a bottom can be formed.

In the method for manufacturing a honeycomb structured body of the present invention, the light diffusion medium is preferably a light-transmitting rod having a curved surface, devitrified glass, glass having bubbles, or water.
A light-transmitting substance with a curved surface is not heated by laser light, and light is scattered on the curved surface, so that the ability to process laser light can be reduced and connected without penetrating. It can be processed leaving the bottom of the hole.

  In addition, devitrified glass has a phase-separated interior even if the surface is not curved, so that light is easily scattered, the ability to process laser light can be reduced, and the bottom is formed without penetrating. be able to. Moreover, it can process by leaving the bottom of a connection hole by filling water in a predetermined location. When filled with water, a large amount of bubbles are generated by boiling water heated by mixing and processing with a water jet stream. For this reason, the laser beam is rapidly attenuated in the filled water, and processing can be performed while leaving the bottom of the connection hole.

  In the method for manufacturing a honeycomb structured body of the present invention, after forming the connection holes, sealing portions are respectively formed on the first end face and the second end face in the flow path having the first or second opening. It is preferable.

  By forming sealing portions on the first end face and the second end face respectively in the flow path having the first or second opening, the flow path having the first or second opening becomes the first flow path. The first end face and the second end face each have a sealing portion, and the flow path having the first or second opening constitutes a first space by being connected by the connection hole, and the first end face The flow path without the opening and the second opening constitutes a second space extending from the first end surface to the second end surface, and the first space and the second space are separated from each other by the inner wall. A honeycomb structure can be obtained.

  In such a honeycomb structure, the flow path having the first or second opening has the sealing portions on the first end face and the second end face, respectively, thereby forming the flow path having the first or second opening. Intrusion of fluid from the first end face and the second end face can be prevented. Further, the first space can be configured by connecting the flow paths having the first or second openings through the connection holes. Furthermore, since the first space is separated by the inner wall from the second space extending from the first end surface to the second end surface, which is constituted by the flow path without the first opening and the second opening, the first space flows through the first space. The fluid (first fluid) and the fluid flowing in the second space (second fluid) are not in direct contact. For this reason, by having functions such as heat transfer and filtration on the inner wall, it can be used as a honeycomb structure having functions such as a heat exchanger, a filter, and separation.

In the method for manufacturing a honeycomb structured body of the present invention, the ceramic is preferably made of any of silicon carbide, silicon-impregnated silicon carbide, alumina, cordierite, silicon nitride, aluminum nitride, or zirconia.
When the honeycomb structure is made of silicon carbide, silicon-impregnated silicon carbide, alumina, cordierite, silicon nitride, aluminum nitride, or zirconia, a high-strength honeycomb structure having heat resistance and corrosion resistance can be obtained. However, these ceramics are poor in workability and can be obtained by a method for manufacturing a honeycomb structure using a laser processing machine in combination with a water flow of a water jet having high processing performance according to the present invention.

  Next, although the honeycomb structure to which the manufacturing method of the honeycomb structure of the present invention is applied will be described, the manufacturing method of the present invention is not limited to these honeycomb structures.

The honeycomb pattern and size of the honeycomb structure to which the manufacturing method of the present invention is applied are not particularly limited. In the present embodiment, a honeycomb structure having an 8 × 8 grid-like flow path has been described. However, for example, a honeycomb having a hexagonal flow path or a honeycomb having a combination of octagonal and quadrangular flow paths is not particularly limited. .
The shape of the honeycomb structure to which the manufacturing method of the present invention is applied is not particularly limited. Other cylinders such as hexahedrons and hexagonal cylinders can also be applied. In the case of a cylinder, a region where a group of connection holes are formed in the side surface can be defined as a first side wall, and a region on the opposite side can be defined as a second side wall.

A honeycomb structure to which the manufacturing method of the present invention is applied has at least a first end face, a second end face, a first side wall, and a second side wall, and is partitioned by an inner wall and extends from the first end face to the second end face. In a honeycomb structure made of ceramic having a plurality of flow paths, a plurality of flow streams formed on a first opening formed on the first side wall or the second side wall and on a plurality of inner walls facing the first opening. And a second opening for connecting the roads.
In the honeycomb structure to which the manufacturing method of the present invention is applied, the flow path extends from the first end face toward the second end face. Moreover, the side surface of the honeycomb structure has a first side wall and a second side wall, and the second side wall is located opposite to the first side wall.

According to the honeycomb structure to which the manufacturing method of the present invention is applied, unlike the conventional honeycomb structure in which the flow path extends in one direction, a fluid flow can be created in the direction across the honeycomb structure. Further, in such a honeycomb structure, since the first opening and the second opening are formed inside the first opening, not only the flow path located on the outermost periphery but also the flow path on the inner side. A fluid flow can be created. In addition, since the second opening is formed at a position facing the first opening, the fluid can be moved to the flow path inside the second opening in the shortest distance, and the fluid flows efficiently. A honeycomb structure that can be provided can be provided.
Furthermore, since the honeycomb structure to which the manufacturing method of the present invention is applied is made of ceramic, it has heat resistance and corrosion resistance, and has high strength. Can be handled.

The honeycomb structure to which the manufacturing method of the present invention is applied is not particularly limited, but preferably has a plurality of connection holes.
The honeycomb structure to which the manufacturing method of the present invention is applied has a plurality of connection holes, so that a larger amount of fluid can flow in the direction crossing the flow path of the honeycomb structure.

In the honeycomb structure to which the manufacturing method of the present invention is applied, it is preferable that the connection holes are alternately formed in the plurality of flow paths facing the first side wall or the second side wall.
In the honeycomb structure to which the manufacturing method of the present invention is applied, the connection holes are alternately formed in the plurality of channels facing the first side wall or the second side wall. The flow in the direction crossing can be arranged in alternate flow paths. For this reason, the area of the inner wall separating the fluid flowing along the flow path (second fluid) and the fluid flowing in the direction crossing the flow path (first fluid) can be increased.

  In the honeycomb structure to which the manufacturing method of the present invention is applied, the flow path having the first or second opening has sealing portions on the first end surface and the second end surface, respectively, The flow path having the second opening constitutes the first space by being connected by the connection hole, and the flow path without the first opening and the second opening extends from the first end face to the second end face. The first space and the second space are preferably separated from each other by the inner wall.

  In the honeycomb structure to which the manufacturing method of the present invention is applied, the flow path having the first or second opening has the sealing portions on the first end face and the second end face, respectively. Intrusion of fluid from the first end face and the second end face into the flow path having the opening can be prevented. Further, the first space can be configured by connecting the flow paths having the first or second openings through the connection holes. Furthermore, since the first space is separated by the inner wall from the second space extending from the first end surface to the second end surface, which is constituted by the flow path without the first opening and the second opening, the first space flows through the first space. The fluid (first fluid) and the fluid flowing in the second space (second fluid) are not in direct contact. For this reason, the honeycomb structure which has functions, such as a heat exchanger, a filter, and isolation | separation, can be provided by having functions, such as heat transfer and filtration, in an inner wall.

In the honeycomb structure to which the manufacturing method of the present invention is applied, the first space preferably has a plurality of the connection holes.
The honeycomb structure to which the manufacturing method of the present invention is applied has a plurality of connection holes in the first space, so that the plurality of connection holes can serve as an inlet and an outlet for the fluid flowing in the first space. . By providing an inlet and an outlet with a plurality of connection holes in the first space, the fluid (first fluid) flowing through the first space can be continuously supplied.

  In addition, by having a plurality of connection holes in the first space, there is an effect of increasing the amount of heat and substance passing through the inner wall. The heat that passes through the inner wall that separates the first space and the second space is proportional to the temperature difference between the first space and the second space. By forming a flow from the inlet to the outlet in the fluid flowing through the first space, a new first fluid can be constantly supplied, and a temperature difference can be generated on the inner wall to increase the amount of heat that moves. When the inner wall that separates the first space and the second space has a separation function that causes a density difference such as a medium, if the density difference between the first space and the second space increases, clogging, osmotic pressure, etc. Due to the effect, the amount of moving medium is reduced. By forming a flow from the inlet to the inlet to the fluid flowing in the first space, a new first fluid is always supplied, and the separation function of the honeycomb structure is increased by reducing the concentration difference on the inner wall. Can do.

The honeycomb structure to which the manufacturing method of the present invention is applied preferably has the connection holes on the first side wall and the second side wall, respectively.
The honeycomb structure to which the manufacturing method of the present invention is applied has a connection hole on each of the first side wall and the second side wall, so that the flow distance of the first fluid connecting the inlet and the outlet passes through which flow path. Can be made equivalent. For this reason, since the first fluid can be spread over the entire inner wall, it is possible to provide a honeycomb structure capable of efficiently performing heat transfer or mass transfer.

In the honeycomb structure to which the manufacturing method of the present invention is applied, the first opening and the second opening are formed in a slit shape, and the length of the first opening is the length of the second opening. Longer than this is preferable.
The honeycomb structure to which the manufacturing method of the present invention is applied can efficiently supply fluid from the side of the elongated channel by configuring the first opening and the second opening in a slit shape. Furthermore, by making the first opening larger than the second opening, it is possible to reduce the resistance of the first fluid in the first opening while reducing the influence on the strength reduction of the entire honeycomb structure, Pressure loss can be reduced efficiently.

In the honeycomb structure to which the manufacturing method of the present invention is applied, the plurality of second openings are preferably elongated in order toward the first openings.
The honeycomb structure to which the manufacturing method of the present invention is applied is configured such that the second opening becomes longer in order toward the first opening, thereby reducing the influence on the strength reduction of the honeycomb structure. The resistance of the first fluid in the first opening can be reduced, and the pressure loss can be reduced more efficiently.

Preferably, the first opening and the second opening are configured in a slit shape, and the length of the first opening and the length of the plurality of second openings are both equal.
In the honeycomb structure to which the manufacturing method of the present invention is applied, the first opening and the second opening are formed in a slit shape, and the length of the first opening and the lengths of the plurality of second openings are By configuring so that both are equal, the volume of the connection hole formed by the first opening and the second opening can be increased. By increasing the volume of the connection hole, the first fluid can be efficiently distributed according to the resistance generated in each flow path connected to the connection hole.

The connection hole of the honeycomb structure to which the manufacturing method of the present invention is applied preferably has five or more layers of second openings stacked.
In the honeycomb structure to which the manufacturing method of the present invention is applied, the first fluid can be supplied to the sixth channel counted from the first side wall by stacking the second openings of five layers or more. it can. By adopting such a configuration, the area of the inner wall that separates the first space and the second space can be increased.
In addition, the aspect ratio between the diameter or width and depth of the connection hole formed by stacking the second openings of five layers or more is 6 or more if the channel is a square channel, and the channel in the deep position is connected to the connection hole. Can be connected.

It is preferable that ten or more layers of second openings are stacked in the connection hole of the honeycomb structure to which the manufacturing method of the present invention is applied.
In the honeycomb structure to which the manufacturing method of the present invention is applied, the first fluid is supplied to the eleventh channel counted from the first side wall side by stacking the second openings of five layers or more. it can. With such a configuration, the area of the inner wall separating the first space and the second space can be further increased.
In addition, the aspect ratio of the diameter or width and depth of the connection hole formed by stacking the second openings of 10 layers or more is 11 or more in the case of a square channel, and a channel at a deeper position is connected. Can be connected with holes.

The honeycomb structure ceramic to which the manufacturing method of the present invention is applied is preferably made of any of silicon carbide, silicon-impregnated silicon carbide, alumina, cordierite, silicon nitride, aluminum nitride, or zirconia.
The honeycomb structure to which the manufacturing method of the present invention is applied is composed of any one of silicon carbide, silicon-impregnated silicon carbide, alumina, cordierite, silicon nitride, aluminum nitride, or zirconia, thereby providing heat resistance and corrosion resistance. A high-strength honeycomb structure can be provided.
When used in a heat exchanger, it is desirable to use silicon carbide, silicon carbide impregnated with silicon, aluminum nitride, or silicon nitride. These ceramics have high thermal conductivity and are suitable as heat exchangers.

  The method for manufacturing a honeycomb structure of the present invention can be obtained by forming connection holes in the first side wall or the second side wall of the honeycomb-shaped ceramic. It can be obtained by forming the first and second openings. The connection hole can be formed by laser processing using a honeycomb-shaped ceramic in combination with a water flow of a water jet on the first side wall or the second side wall. The wavelength and output of the laser beam of the laser processing machine can be appropriately selected according to the honeycomb ceramic.

The laser processing machine using a water jet water flow is a laser processing machine that allows laser light to pass through the water jet water flow, and is also called a water guide laser processing machine.
In addition, the laser processing method combined with the water jet water flow can guide the laser light into the water jet water flow and guide it to the processing point while totally reflecting it, and it passes through the thin water flow without diffusing the laser light. Therefore, the depth of focus is deep and the processing performance is higher than that of a processing machine using only laser light.

The method for manufacturing a honeycomb structured body of the present invention can be obtained by processing without penetrating the bottom of the connection hole by using a laser processing machine combined with a water flow of a water jet having high processing performance.
Processing while leaving the bottom of the connection hole can be realized by scattering laser light at a predetermined location and dispersing light energy. By inserting the light diffusing medium at a predetermined location, the laser light is weakened below and cannot be processed. The light diffusion medium is not particularly limited as long as light can be dispersed. For example, a light-transmitting rod having a curved surface such as a glass rod, devitrified glass, glass having bubbles inside, water, and the like can be used. A light-transmitting substance is not heated by laser light, and light is scattered on a curved surface, so that the ability to process laser light can be reduced, and the bottom of the connection hole can be formed without penetrating. Can be processed.

  In addition, devitrified glass has a phase-separated interior even if the surface is not curved, so that light is easily scattered, the ability to process laser light can be reduced, and the bottom is formed without penetrating. be able to. Moreover, it can process by leaving the bottom of a connection hole by filling water in a predetermined location. When filled with water, a large amount of bubbles are generated by boiling water heated by mixing and processing with a water jet stream. For this reason, the laser beam is rapidly attenuated in the filled water, and processing can be performed while leaving the bottom of the connection hole. Even when water is not filled, water is supplied by the water flow along with the laser light, but the amount of water used for the water flow is small and the laser light scatters quickly near the place where the ceramic is processed (processing point). As the laser beam is weakened, bubbles cannot be formed in the section.

  The manufacturing method of the honeycomb structure of the present invention includes various modifications of the connection holes, but can be processed by tilting or scanning the laser beam according to the shape.

Further, when processing while scanning with laser light, the connection hole having a desired shape can be formed by appropriately changing the length of the light diffusion medium inserted into each flow path.
The sealing part of the present invention may be formed in any way and is not particularly limited. For example, a plug made of the same ceramic material as that constituting the inner wall may be inserted. For example, when the honeycomb structure is made of silicon carbide, silicon nitride, or silicon carbide impregnated with silicon, silicon powder may be applied to the plug as an adhesive and then fired. Silicon melts and functions as an adhesive.
Further, for example, it can be obtained by injecting and baking a paste in which an inorganic binder, an organic binder, and inorganic particles are mixed. Alumina sol, silica sol, etc. can be used as the inorganic binder, polyvinyl alcohol, phenol resin, etc. can be used as the organic binder, and silicon carbide, alumina, cordierite, silicon nitride, aluminum nitride, zirconia, etc. can be used as the inorganic particles.

  Next, Embodiment 1 and Embodiment 2 of the honeycomb structure to which the manufacturing method of the present invention is applied will be described.

  Embodiment 1 is a honeycomb structure in which the first end surface and the second end surface are open and the connection hole is formed in the first side wall.

Embodiment 2 is a honeycomb structure of the following form.
Connection holes are alternately formed in the plurality of channels facing the first side wall, and the bottoms of the connection holes reach the second end surface. The connection hole does not penetrate the second end face. The first end face and the second end face of the flow path having the first opening and the second opening each have a sealing portion, thereby constituting a first space.
The flow path without the first opening and the second opening constitutes a second space extending from the first end surface to the second end surface, and the first space and the second space are separated from each other by the inner wall. . The first space has connection holes on the first and second side walls. Four independent spaces constitute the first space, and 32 4 × 8 independent flow paths constitute the second space.

<Embodiment 1>
The honeycomb structure of Embodiment 1 will be described with reference to the drawings.
Fig. 1 is a perspective view of a honeycomb structure according to Embodiment 1 of the present invention. Fig. 2 is a perspective view of a modified example of the honeycomb structure according to the first embodiment of the present invention. 3 is a cross-sectional view of the honeycomb structure according to the first embodiment of the present invention. FIG. 3A is a cross-sectional view taken along the line AA ′ in FIG. 1, and FIG. 3B is a cross-sectional view taken along the line BB ′ in FIG. . FIG. 4 is a cross-sectional view of a modified example of the connection hole of the honeycomb structure according to the first embodiment of the present invention. This corresponds to a cross-sectional view taken along the line AA ′ of FIG. Fig. 5 is a perspective view of a modified example of the honeycomb structure according to the first embodiment of the present invention. 6 is a cross-sectional view of a modified example of the honeycomb structure of FIG. 5, (a) is a cross-sectional view along CC ′ in FIG. 5 (a), and (b) is a cross-sectional view along EE ′ in FIG. 5 (b). FIG. 5C is a sectional view taken along the line DD ′ in FIG. 5A and a sectional view taken along the line FF ′ in FIG.

  As shown in FIG. 1, the honeycomb structure 1000 according to the first embodiment alternates among the eight flow paths 60 in contact with the first side wall 21 of the honeycomb structure 1000 having 8 × 8 flow paths. Four connection holes 30 are provided. As shown in FIG. 3, each connection hole 30 includes a first opening 31 formed in the first side wall 21 and a plurality of second openings 32 formed in the inner wall 50. As shown in FIG. 3A, the first opening 31 and the second opening 32 have a slit shape, and the lengths of the first opening 31 and the second opening 32 are the same. As shown in FIG. 3B, the cross section of the row adjacent to the row where the connection hole 30 is formed does not have a hole in the inner wall 50.

  The position, shape, and number of the connection holes 30 are not particularly limited. 2 and 5 are modified examples in which the position of the connection hole 30 and the surface shape are different. FIG. 2A shows a honeycomb structure 1000 having one slit-like connection hole 30, and FIG. 2B shows that the slit-like connection hole 30 is formed in all the channels 60 facing the first side wall 21. Is formed. Each connection hole 30 is also formed in a slit shape. FIG. 5A shows four circular connection holes 30 that are alternately arranged among the eight flow paths 60 in contact with the first side wall 21 of the honeycomb structure having the 8 × 8 flow paths 60. A honeycomb structure 1000 is shown. Fig. 5 (b) has four groups of connection holes 30 so as to alternate among the eight channels 60 in contact with the first side wall 21 of the honeycomb structure having 8x8 channels. One group of connection holes 30 is a honeycomb structure 1000 including five circular connection holes 30. FIG. 5C shows a honeycomb structure 1000 having one circular connection hole 30.

  The shape of the connection hole 30 in the depth direction is not particularly limited. FIG. 4 shows a modification of the connection hole 30, is a cross-sectional view of the connection hole 30 in the flow path direction, and shows the A-A ′ cross section of FIG. 1. (A) shows the connection hole whose cross-sectional shape is V-shaped, the first opening 31 is longer than the second opening 32, and the plurality of second openings 32 are sequentially directed toward the first opening 31. It is configured to be long. (B) shows the connection holes aligned so that one side of the first and second openings is vertical. The first opening 31 is longer than the second opening 32, and the plurality of second openings 32 are The connection hole is configured to become longer in order toward the first opening 31, and the connection hole has a trapezoidal cross section. (C) shows the connection hole 30 having the same length of the first opening 31 and the second opening 32 and penetrating the first side wall 21 and the second side wall 22. (D) shows the connection hole 30 in which the connection hole 30 is formed from the 1st side wall 21 and the 2nd side wall 22, and each shares the inner wall used as a bottom. (E) shows the connection hole 30 having a larger inside, the first opening 31 is shorter than the second opening 32, and the plurality of second openings 32 become shorter toward the first opening 31 in order. It is configured as follows.

  The honeycomb pattern and size of the honeycomb structure 1000 are not particularly limited. In the present embodiment, the honeycomb structure 1000 having the 8 × 8 grid-like flow path 60 has been described. However, for example, a honeycomb having a hexagonal flow path, a honeycomb having a combination of octagonal and quadrangular flow paths, etc. It is not limited.

  The honeycomb structure of the present embodiment can be obtained by forming the connection holes 30 in the first side wall 21 or the second side wall 22 of the honeycomb-shaped ceramic. As shown in FIG. 9, the first and second openings are formed by inserting the light diffusion medium 90 into the flow path 60 facing the second side wall 22 and moving the laser source 85 to scan the laser light 80. Can be processed. Depending on the shape of the connection hole 30, the connection hole 30 having a desired shape can be obtained by appropriately changing the insertion length of the light diffusion medium 90 as shown in FIG. Further, as shown in FIGS. 11 and 12, the connection hole 30 having a desired shape may be obtained by scanning while the laser beam 80 is appropriately tilted or swiveled.

  The honeycomb structure 1000 of the present embodiment can be processed by leaving the bottom of the connection hole 30 by inserting the light diffusion medium 90. FIG. 14 shows how the laser light 80 is diffused by the light diffusion medium 90. FIGS. 14A, 14 </ b> B, and 14 </ b> C show processing by combining the laser beam 80 and the water flow 82. As the processing machine in which the laser beam 80 and the water flow 82 are combined, for example, an MCS300 type laser processing machine manufactured by Makino Milling can be used.

FIG. 14A is an explanatory diagram in which a glass rod 91 is used for the light diffusion medium 90 and can be processed while the bottom of the connection hole 30 is left by the diffusion of the laser light 80 by the convex surface of the glass.
FIG. 14B is an explanatory diagram in which a devitrifying glass 92 is used for the light diffusing medium 90, and the laser light 80 can be diffused by irregular reflection inside the glass and processed while leaving the bottom of the connection hole 30.
FIG. 14C is an explanatory diagram using water 93 for the light diffusion medium 90, and diffuses the laser light 80 by the irregular reflection of bubbles generated by heat and turbulent flow of water, leaving the bottom of the connection hole 30. Can be processed.

<Embodiment 2>
The honeycomb structure 1000 of Embodiment 2 will be described with reference to the drawings.
Fig.7 (a) is a perspective view of the honeycomb structure 1000 of Embodiment 2 which concerns on this invention. (B) is a perspective view of the modification of the honeycomb structure 1000 of Embodiment 2 which concerns on this invention. Fig. 8 is a cross-sectional view of the honeycomb structure 1000 according to the second embodiment of the present invention, in which (a) is a cross-sectional view taken along line GG 'in Fig. 7 (a), and (b) is an I- I 'sectional drawing, (c) is HH' sectional drawing of Fig.7 (a), and JJ 'sectional drawing of FIG.7 (b).

  In the honeycomb structure 1000 of the second embodiment, the connection holes 30 are alternately formed in the plurality of flow paths 60 facing the first side wall 21, and the bottom of the connection holes 30 reaches the second side wall 22. The connection hole 30 does not penetrate the second side wall 22. Each of the first end surface 11 and the second end surface 12 of the flow path having the first opening and the second opening has a sealing portion 70, thereby forming a first space.

The flow path without the first opening and the second opening constitutes a second space extending from the first end surface 11 to the second end surface 12, and the first space and the second space are isolated from each other on the inner wall. Yes. The first space has connection holes on the first and second side walls. The first space is composed of four independent spaces, and 32 4 × 8 independent flow paths constitute the second space.
The first space can create a fluid flow from the first side wall 21 to the second side wall 22 (and vice versa). The second space can also create a fluid flow from the first end surface 11 to the second end surface 12 (and vice versa). Since the first space and the second space are separated by the inner wall, they are not mixed with each other, and heat and mass transfer can be performed through the inner wall. This effect can be suitably used as a heat exchanger, a filter, a support for a separation membrane, and the like.

  The honeycomb structure of the present embodiment can be obtained by forming connection holes in the first side wall or the second side wall of the honeycomb-shaped ceramic. As shown in FIG. 9, the first and second openings can be processed by inserting a light diffusion medium 90 into a flow path 60 facing the second side wall 22 and scanning with laser light 80. it can. Depending on the shape of the connection hole 30, the connection hole 30 having a desired shape can be obtained by appropriately changing the insertion length of the light diffusion medium 90 as shown in FIG. Further, as shown in FIGS. 11 and 12, the connection hole 30 having a desired shape may be obtained by scanning while the laser beam 80 is appropriately tilted or swiveled. First, similarly to the example of FIG. 9, after forming the slit-like first and second openings 31 and 32 having the same length as shown in FIGS. 11A and 12A, FIG. As shown in FIG. 12B, scanning is performed while the laser beam 80 is appropriately inclined. In the example of FIG. 11, the first opening is longer than the second opening, and the second opening is sequentially longer toward the first opening. In the example of FIG. 12, the first opening is the second opening. The second opening is shorter toward the first opening in order.

  The honeycomb structure of the present embodiment can be processed by leaving the bottom of the connection hole 30 by inserting the light diffusion medium 90. 13 and 14 show how the laser light is diffused by the light diffusion medium 90. FIGS. 13A, 13B, and 13C show the processing with only the laser beam 80, and FIGS. 14A, 14B, and 14C show the processing with the laser beam using a water jet in combination. As a laser processing machine using a water jet, for example, an MCS300 type laser processing machine manufactured by Makino Milling Co. can be used.

FIGS. 13 (a) and 14 (a) are explanatory views using a glass rod 91 for the light diffusing medium 90, and processing is performed by diffusing the laser light 80 by the convex surface of the glass, leaving the bottom of the connection hole. it can.
FIG. 13B and FIG. 14B are explanatory diagrams in which a devitrifying glass 92 is used for the light diffusion medium 90, and the laser light 80 is diffused by irregular reflection inside the glass so as to leave the bottom of the connection hole. be able to. FIGS. 13 (c) and 14 (c) are explanatory views using water 93 as the light diffusion medium 90. The laser light 80 is diffused and connected by the turbulent reflection of bubbles generated by heat and water turbulence due to processing. It can be processed leaving the bottom of the hole.

In this example, connection holes having a trapezoidal cross section are formed in a honeycomb-shaped ceramic actually made of porous silicon carbide, and the honeycomb structure 1000 according to the present invention is manufactured using FIGS. 15 and 16. I will explain.
A honeycomb structure 1000 according to the present invention was manufactured by using a honeycomb-shaped ceramic made of silicon carbide of 34 mm × 34 mm × 130 mm having a total of 576 square channels of 24 × 24. In addition, the end surface in the longitudinal direction has a channel opening and is a first end surface 11 and a second end surface 12. The four surfaces other than the first end surface 11 and the second end surface 12 are side walls, of which the surface forming the connection hole 30 is the first side wall 21, and the opposite surface is the second side wall 22. The inner wall 50 has a thickness of 0.25 mm, and the first and second side walls have a thickness of 0.3 mm. The size of the channel 60 is a square having a side of 1.14 mm.

  As shown in FIG. 15, connection holes 30 were formed in the honeycomb-shaped ceramic. The 12 connection holes 30 are formed by forming the first openings 31 in the 12 flow paths alternately among the 24 flow paths facing the first side wall 21 and further forming the second openings. Formed. The bottom of the connection hole 30 is the second side wall 22, and the second opening is formed in all the inner walls. The distance between the first opening and the second opening and the first end face is 10 mm, the first opening 31 extends from the first end face 11 to a position of 40 mm, and the second opening in the lowest layer is from the first end face 11 It extends to a position of 25 mm. The second opening becomes longer in order toward the first opening 31, and the connection hole 30 has a trapezoidal cross section. The width of the first opening is 0.6 mm.

The manufacturing method will be described in detail below.
When the connection hole 30 is formed, a circular glass rod longer than the flow path is inserted into the flow path facing the second side wall 22, and the other flow paths are circular up to a portion other than the trapezoidal basin. A glass rod was inserted. (See Figure 10)
Next, it processed using the MCS300 type | mold laser processing machine by Makino milling company along the flow path 60 which faces the 1st side wall 21. FIG. Processing was performed at a laser wavelength of 532 nm, an output of 80 W, a nozzle diameter of the water flow 82 of φ80 μm, and a scanning speed of 300 mm / min.

The honeycomb structure 1000 obtained by processing in this way was cut along the connection holes 30 to confirm the connection holes 30. As shown in FIG. 16, the connection hole 30 had a trapezoidal cross section, the entire inner wall penetrated, the first opening 31 had a length of 30 mm, and the lowermost second opening 32 had a length of 15 mm.
Thus, it was confirmed that the connection hole can be formed by a laser processing machine using a water flow.

  In addition, the size, arrangement, and number of connection holes can be selected as appropriate, and heat exchangers, filters, etc. can be formed by forming sealing portions on the first and second end surfaces of the flow path as necessary. Can be used as

  This application is based on Japanese Patent Application No. 2013-230358 filed on Nov. 6, 2013, the contents of which are incorporated herein by reference.

  The method for manufacturing a honeycomb structure of the present invention uses exhaust gas filters for internal combustion engines, combustion furnaces, etc., heat exchangers for internal combustion engines, combustion furnaces, etc., filters for water purification, sewage treatment, chemical plants, and semipermeable membranes. It can utilize for manufacture of the base material of a freshwater manufacturing apparatus.

DESCRIPTION OF SYMBOLS 11 1st end surface 12 2nd end surface 21 1st side wall 22 2nd side wall 30 Connection hole 31 1st opening 32 2nd opening 50 Inner wall 60 Flow path 70 Sealing part 80 Laser beam 82 Water flow (water jet)
85 Laser source 90 Light diffusion medium 91 Glass rod 92 Devitrified glass 93 Water 1000 Honeycomb structure

Claims (5)

A honeycomb structure made of ceramic having at least a first end face, a second end face, a first side wall, and a second side wall, and having a plurality of flow paths partitioned by an inner wall and extending from the first end face to the second end face,
From the first side wall, by laser light passing through the water jet water stream,
A first opening formed in the first sidewall or the second sidewall;
A second opening formed on a plurality of inner walls facing the first opening and connecting a plurality of flow paths;
A method for manufacturing a honeycomb structure, characterized in that a connection hole made of is formed. In the method for manufacturing the honeycomb structure,
2. The method for manufacturing a honeycomb structured body according to claim 1, wherein a laser light is attenuated by inserting a light diffusion medium into a part of the flow path to form the connection hole having a bottom.   The method for manufacturing a honeycomb structure according to claim 2, wherein the light diffusion medium is a light-transmitting rod having a curved surface, devitrified glass, glass having bubbles, or water. The method for manufacturing the honeycomb structure includes:
The sealing portion is formed on each of the first end face and the second end face in the flow path having the first or second opening after the connection hole is formed. The manufacturing method of the honeycomb structure as described in any one of Claims.   The honeycomb structure according to any one of claims 1 to 4, wherein the ceramic is made of any one of silicon carbide, silicon-impregnated silicon carbide, alumina, cordierite, silicon nitride, aluminum nitride, or zirconia. Body manufacturing method.

Images