JP2014141062A - Method for producing honeycomb structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a honeycomb structure, the number of whose production steps can be reduced.SOLUTION: The honeycomb structure is constituted so that a part of a plurality of through-holes, the end face of each of which is opened and the adjacent ones of which are divided from each other by a partition wall, is sealed. The method for producing the honeycomb structure comprises the steps of: inserting a sealing tool 400, which is vibrated at 1 kHz or lower frequency, into a part of a plurality of hexagonal cells 70h of a green honeycomb molding 70 formed on the end face of a columnar body by opening the plurality of hexagonal cells 70h divided by partition walls 70W; and press-fixing the adjacent partition walls 70W to each other to seal the hexagonal cell 70h. Since the sealing tool is vibrated at 1 kHz or lower frequency, the hexagonal cell 70h can be sealed extremely easily.

Description

  The present invention relates to a method for manufacturing a honeycomb structure and a honeycomb structure, and more particularly to a method for manufacturing a honeycomb structure that becomes a honeycomb structure by firing a green honeycomb molded body.

  Conventionally, for example, a ceramic honeycomb structure having a plurality of through-holes having a polygonal cross section is known. Such a honeycomb structure is used for a diesel particulate filter (diesel particulate filter) or the like. Such a honeycomb structure is manufactured by forming a green raw material by forming a ceramic raw material powder by an extrusion method or the like, cutting the green honeycomb body into a desired length, sealing, and firing. . Patent Document 1 discloses a method for manufacturing such a honeycomb filter. In Patent Document 1, a sealing material is supplied to an end portion of a through hole of a honeycomb structure by pressing the sealing material with a piston against one end of the honeycomb structure disposed in a cylinder, thereby sealing the through hole. ing.

Japanese Patent Publication No. 63-24731

  However, the method of Patent Document 1 requires the use of a mask for injecting a sealing material and selecting a sealing location, and a precision cutting step after the drying step.

  This invention is made | formed in view of the said subject, and it aims at providing the manufacturing method of the honeycomb structure which can reduce the number of processes.

  The present invention relates to a method for manufacturing a honeycomb structure in which a part of a plurality of through-holes that are opened at an end face of a pillar body and are partitioned by partition walls are sealed, and a plurality of partition walls that are partitioned by partition walls at the end face of the pillar body By inserting a sealing jig oscillated at a frequency of 1 kHz or less into a part of the plurality of through holes of the green honeycomb molded body in which the through holes are opened, the partition walls are crimped to form the through holes. A honeycomb structure manufacturing method including a sealing step of sealing.

According to this configuration, the through hole can be sealed very easily in the manufacture of the honeycomb formed body. In particular, since the sealing jig is vibrated at a frequency of 1 kHz or less, the partition wall can be easily crimped.
Further, when the manufactured honeycomb structure is applied to a diesel particulate filter, the inlet of the gas flow path can be made wider than that of the conventional sealing method, so that the pressure loss can be reduced. At this time, it is preferable that the green honeycomb molded body that becomes a honeycomb structure by firing is extruded from the raw material and immediately cut into a predetermined length, and then subjected to the sealing step.

  In this case, in the sealing step, it is preferable to seal the through holes of the green honeycomb structure in which a plurality of hexagonal through holes are opened.

  According to this configuration, in the sealing step, the through holes of the green honeycomb structure in which a plurality of hexagonal through holes are opened are sealed. Therefore, when used as a diesel particle filter, in the gas flow path, many holes are opened with a shorter cell wall length than the quadrilateral holes, and the diesel particle filter has better characteristics. And can.

  In this case, the green honeycomb molded body has one first through-hole and six second holes having a smaller opening area than the first through-holes adjacent to each other around the first through-hole via a partition wall. In the sealing step, the sealing protrusion of the sealing jig having a plurality of sealing protrusions including a quadrangular pyramid shape and a truncated pyramid shape whose bottom surface is a rhombus is formed on the longer side. Is inserted into the second through hole while vibrating at a frequency of 1 kHz or less so as to abut against the partition wall of the first through hole, thereby sealing the first through hole by pressing the partition walls together. Is preferred.

  According to this configuration, the green honeycomb molded body is more than one first through hole and the first through hole adjacent to each other around the first through hole via the partition wall. And six second through holes having a small opening area. For this reason, for example, when the honeycomb structure is applied to a diesel particle filter, the second through hole having a small opening area is opened while sealing the first through hole having a large opening area on the inlet side of the diesel particle filter, By opening the first through hole having a large opening area while sealing the second through hole having a small opening area on the outlet side, the filtration area is made larger than that in which the through holes having the same opening area are adjacent to each other. can do. For this reason, when it applies to a diesel particulate filter, the pressure loss when soot collects is small, and it can be set as the thing with high soot collection efficiency. Furthermore, in the sealing step, the longer side of the sealing protrusion having a plurality of sealing protrusions including a quadrangular pyramid shape having a rhombic bottom surface and a quadrangular pyramid shape is the first through hole. By inserting the second through hole while being in contact with the partition wall while vibrating at a frequency of 1 kHz or less, the partition walls are pressed together to seal the first through hole. Thereby, the 1st through-hole enclosed by the 2nd through-hole can be sealed easily. Therefore, when it is used as a diesel particulate filter, it can be made more excellent in characteristics particularly when applied to the inlet side.

  Further, in the sealing step, the sealing protrusions of the sealing jig having a plurality of sealing protrusions including a triangular pyramid shape and a triangular frustum shape are provided for each of the six through holes adjacent to the periphery of one through hole. By inserting the metal plate while vibrating at a frequency of 1 kHz or less, the through-holes can be sealed by pressing the partition walls together.

  According to this configuration, in the sealing step, the six sealing protrusions of the sealing jig having a plurality of sealing protrusions including a triangular pyramid shape and a triangular frustum shape are adjacent to the periphery of one through hole. By inserting each through hole while vibrating at a frequency of 1 kHz or less, the partition walls are pressure-bonded to seal the through hole. For this reason, for example, the sealing projections are inserted into the through holes so that the sides of the plurality of triangular pyramidal sealing projections are in contact with the partition walls of the hexagonal through holes. Among the seven through holes, one central through hole can be sealed. Therefore, when used as a diesel particle filter, it is possible to efficiently perform sealing on the side that becomes the inlet side.

  In the sealing step, the sealing projection of the sealing jig having a plurality of sealing projections including a conical shape and a truncated cone shape is provided for each through-hole surrounded by six through-holes. By inserting it while vibrating at a frequency of 1 kHz or less, the through-holes can be sealed by pressing the partition walls together.

  According to this configuration, in the sealing step, the sealing projection of the sealing jig having a plurality of sealing projections including a conical shape and a truncated cone shape is surrounded by the six through holes. By inserting each through hole while vibrating at a frequency of 1 kHz or less, the partition walls are pressed together to seal the through hole. For this reason, for example, by inserting the sealing protrusions into the through holes so that the side surfaces of the plurality of conical sealing protrusions are in contact with the partition walls of the hexagonal through holes, Among the through holes, six surrounding through holes can be sealed. Therefore, when used as a diesel particle filter, sealing on the side that becomes the outlet side can be performed efficiently.

  Further, in the sealing step, one through hole in which the sealing protrusion of the sealing jig having a plurality of sealing protrusions including a hexagonal pyramid shape and a hexagonal frustum shape is surrounded by six through holes. By inserting each of them while vibrating at a frequency of 1 kHz or less, the partition walls can be pressure-bonded and the through holes can be sealed.

  According to this configuration, in the sealing step, the sealing projection of the sealing jig having a plurality of sealing projections including a hexagonal pyramid shape and a hexagonal truncated pyramid shape is surrounded by six through holes. By inserting each through-hole while vibrating at a frequency of 1 kHz or less, the partition walls are pressed together to seal the through-hole. For this reason, by inserting a plurality of hexagonal pyramidal sealing projections into the same hexagonal through-hole, it is possible to easily smooth the surrounding six through-holes among the seven through-holes adjacent to each other. Can be sealed. Therefore, when used as a diesel particle filter, sealing on the side that becomes the outlet side can be performed efficiently.

  In this case, in the sealing step, each of the sealing projections may be sealed with a sealing jig having a sealing projection closest to the side portion of the hexagonal pyramid shape and the hexagonal frustum shape. it can.

  According to this configuration, in the sealing step, each of the sealing projections is sealed with a sealing jig having a sealing projection closest to the side portion of the hexagonal pyramid shape and the hexagonal frustum shape. To do. For this reason, each of the projections for sealing is disposed at a relatively long distance, and the manufacture of the sealing jig is facilitated. Further, the hexagonal holes opened on the end face of the honeycomb structure after sealing are arranged at a relatively long distance particularly in the side portion, and the sealed portion becomes thick, so that higher strength is obtained. You can have it.

  Further, in the sealing step, each of the sealing protrusions seals the through hole with a sealing jig having sealing protrusions that are in close contact with each other with the base portions of the hexagonal pyramid shape and the hexagonal truncated cone shape facing each other. be able to.

  According to this configuration, each of the sealing projections seals the through hole with the sealing jig having the sealing projections that are in close contact with each other with the base portions of the hexagonal pyramid shape and the hexagonal truncated cone shape facing each other. . Therefore, the hexagonal holes opened in the end face of the honeycomb structure after sealing are disposed relatively closely, and the area of the sealed portion is reduced, so that pressure loss can be further reduced. It becomes possible.

  In the sealing step, the through-holes are sealed with a sealing jig including a groove between the sealing protrusions of the sealing jig having a plurality of sealing protrusions so that the pressure-bonded partition walls are predetermined from the end surfaces. It is preferable to seal the through-holes so that they are in a state parallel to each other over the length.

  According to this configuration, in the sealing step, the pressure-bonded partition walls are sealed by sealing the through hole with the sealing jig including a groove between the valleys of each of the sealing protrusions of the sealing jig having a plurality of sealing protrusions. The through-holes are sealed so as to be parallel to each other over a predetermined length from the end face. Accordingly, the length of the pressure-bonding in a state where the partition walls are parallel to each other after the sealing is over a predetermined length, so that the strength of the pressure-bonding is further improved. Moreover, when it uses as a diesel particle filter, the air resistance in the crimping | compression-bonding part of partition walls becomes small, and it becomes possible to reduce pressure loss.

  In the sealing step, the sealed partition walls are sealed by sealing the through-holes with a sealing jig that is rounded and chamfered between the valleys of each of the sealing protrusions of the sealing jig having a plurality of sealing protrusions. It is preferable to seal the through hole so that the end surface is rounded.

  According to this configuration, in the sealing process, the sealing jig having a plurality of sealing protrusions is crimped by sealing the through hole with the sealing jig rounded and chamfered in the valleys of the sealing protrusions. The through holes are sealed so that the partition walls are rounded at the end faces. For this reason, when it uses as a diesel particulate filter, the air resistance in the junction part of partition walls becomes small, and it becomes possible to reduce pressure loss. Further, chipping or the like can be made difficult to occur at the joined end portions.

  Further, in the sealing step, immediately after the green honeycomb molded body is extruded from the raw material and cut to a predetermined length, the through holes on both end faces of the green honeycomb molded body are simultaneously sealed, and at least the green honeycomb molded body is sealed. The through-hole on one end surface is preferably sealed by inserting a sealing jig oscillated at a frequency of 1 kHz or less into a part of the plurality of through-holes.

  According to this configuration, in the sealing step, immediately after the green honeycomb molded body is extruded from the raw material and cut into a predetermined length, the through holes on both end faces of the green honeycomb molded body are simultaneously sealed, The through-hole on at least one end surface of the molded body seals the through-hole by inserting a sealing jig oscillated at a frequency of 1 kHz or less into a part of the plurality of through-holes. For this reason, a through-hole can be sealed more efficiently than the method of sealing a through-hole for each end surface.

  In this case, it further includes a supporting step of supporting the lower end face of the green honeycomb molded body immediately after being extruded vertically from the raw material with a sealing jig, and in the sealing step, the green after being supported in the supporting step By inserting a plurality of sealing projections of a sealing jig oscillated at a frequency of 1 kHz or less into a part of the through-hole on the lower end face of the honeycomb molded body, the partition walls are pressure-bonded to each other, and the through-hole It is preferable to seal.

  When the diameter of the green honeycomb molded body is increased, when the green honeycomb molded body is extruded from the raw material in the horizontal direction, bending due to gravity increases, and it may be difficult to support the green honeycomb molded body on the side surface. However, according to this configuration, in the supporting step, the lower end face of the green honeycomb molded body immediately after being extruded vertically from the raw material is supported by the sealing jig. Thereby, even with a large-diameter green honeycomb molded body, the green honeycomb molded body can be supported without causing bending or distortion of the through holes. Further, in the subsequent sealing step, a plurality of sealing jigs of the sealing jig that are vibrated at a frequency of 1 kHz or less in a part of the through-hole on the lower end surface of the green honeycomb molded body after being supported in the supporting step. By inserting the protrusions, the partition walls are pressure-bonded to seal the through hole. Thereby, a support process and a sealing process can be performed continuously and efficiently.

  In this case, the sealing jig can selectively change the state in which the sealing protrusion is housed inside the support surface and the state in which the sealing protrusion protrudes outside the support surface. Supporting the lower end face of the green honeycomb molded body immediately after being extruded vertically downward from the raw material by the supporting surface of the sealing jig in a state in which the sealing protrusion is accommodated inside the supporting surface, in the sealing step, The sealing protrusions of the sealing jig in a state where the sealing protrusions are protruded outside the support surface are inserted into a part of the through-hole on the lower end face of the green honeycomb molded body while vibrating at a frequency of 1 kHz or less. By doing so, it is preferable to seal the through-holes by crimping the partition walls together.

  According to this configuration, the sealing jig can selectively change between a state in which the sealing protrusion is accommodated inside the support surface and a state in which the sealing protrusion protrudes outside the support surface. In the step, the lower end surface of the green honeycomb molded body immediately after being extruded vertically downward from the raw material is supported by the supporting surface of the sealing jig in a state where the sealing protrusion is housed inside the supporting surface. For this reason, even with a large-diameter green honeycomb molded body, the green honeycomb molded body can be supported more stably without causing bending or distortion of the through holes. Further, in the sealing step, the sealing protrusion of the sealing jig in a state in which the sealing protrusion protrudes outside the support surface is inserted into a part of the through hole on the lower end surface of the green honeycomb molded body, and the frequency is 1 kHz or less. By inserting each while vibrating, the partition walls are pressure-bonded to seal the through hole. As a result, the through-holes can be sealed by pressing the partition walls while supporting the green honeycomb molded body.

  According to the method for manufacturing a honeycomb structure of the present invention, the number of steps can be reduced.

(A) is a perspective view of the green honeycomb molded object which has a hexagonal cell before sealing, (b) is the elements on larger scale of (a). It is a perspective view which shows the sealing apparatus of the green honeycomb molded object which concerns on 1st Embodiment. It is a fragmentary sectional view of the closing jig for the entrance side of the green honeycomb fabrication object which has a hexagonal cell concerning a 1st embodiment. It is the perspective view which expanded the part A of FIG. It is the top view to which the part A of FIG. 3 was expanded. It is sectional drawing to which the part A of FIG. 3 was expanded. It is the top view to which the site | part corresponding to the part A of FIG. 3 of the sealing jig for exit sides of the green honeycomb molded object which has a hexagonal cell which concerns on 1st Embodiment was expanded. It is a side view which shows the cutting process of the green honeycomb molded object which concerns on 1st Embodiment. It is a fragmentary sectional view which shows the initial state of the sealing process by the side of the entrance of the green honeycomb molded object which has a hexagonal cell which concerns on 1st Embodiment. It is sectional drawing by the XX line of FIG. It is a fragmentary sectional view which shows the state of the middle stage of the sealing process of FIG. It is sectional drawing by the XII-XII line | wire of FIG. It is a fragmentary sectional view which shows the state of the final stage of the sealing process of FIG. It is sectional drawing by the XIV-XIV line | wire of FIG. It is sectional drawing by the XIV-XIV line | wire of FIG. 13 at the time of using the jig | tool for sealing of another form. It is a fragmentary sectional view which shows the initial state of the sealing process of the exit side of the green honeycomb molded object which has a hexagonal cell which concerns on 1st Embodiment. It is sectional drawing by the XVI-XVI line of FIG. It is a fragmentary sectional view which shows the state of the middle stage of the sealing process of FIG. It is sectional drawing by the XVIII-XVIII line of FIG. It is a fragmentary sectional view which shows the state of the final stage of the sealing process of FIG. It is sectional drawing by the XX-XX line of FIG. (A) is a figure which shows the flow of the gas which passes the conventional sealed cell, (b) is a figure which shows the flow of the gas which passes the sealed cell which concerns on embodiment of this invention. (A) is a perspective view of the green honeycomb molded object which has a square cell before sealing, (b) is the elements on larger scale of (a). It is the perspective view which expanded the site | part corresponding to the part A of FIG. 3 of the jig | tool for sealing of the green honeycomb molded object which has a square cell concerning 2nd Embodiment. It is the top view to which the site | part corresponding to the part A of FIG. 3 of the jig | tool for sealing of the green honeycomb molded object which has a square cell which concerns on 2nd Embodiment was expanded. It is a fragmentary sectional view which shows the initial state of the sealing process of the green honeycomb molded object which has a square cell which concerns on 2nd Embodiment. It is sectional drawing by the XXVI-XXVI line | wire of FIG. It is a fragmentary sectional view which shows the state of the middle stage of the sealing process of FIG. It is sectional drawing by the XXVIII-XXVIII line | wire of FIG. It is a fragmentary sectional view which shows the state of the final stage of the sealing process of FIG. It is sectional drawing by the XXX-XXX line of FIG. It is a fragmentary sectional view which shows the initial state of the sealing process of the green honeycomb molded object which concerns on 3rd Embodiment. It is a fragmentary sectional view which shows the state of the middle stage of the sealing process of FIG. It is a fragmentary sectional view which shows the state of the final stage of the sealing process of FIG. It is a fragmentary sectional view of the jig for closure of the green honeycomb molded object concerning a 4th embodiment, and is a figure showing the state where the projection for closure was stored. It is a fragmentary sectional view of the jig for closure of the green honeycomb molded object concerning a 4th embodiment, and is a figure showing the state where the projection for closure was made to project. It is a fragmentary sectional view showing the initial state of the cutting process of the green honeycomb molded object concerning a 4th embodiment. It is a fragmentary sectional view which shows the state of the middle stage of the cutting process of FIG. It is a fragmentary sectional view which shows the initial state of the sealing process of the green honeycomb molded object which concerns on 4th Embodiment. It is a fragmentary sectional view which shows the state of the middle stage of the sealing process of FIG. It is a fragmentary sectional view which shows the state which the sealing process of FIG. 40 advanced further. It is the perspective view which expanded the site | part corresponding to the part A of FIG. 3 of the sealing jig for entrance sides of the green honeycomb molded object which has a hexagonal cell which concerns on 5th Embodiment. It is the top view to which the site | part corresponding to the part A of FIG. 3 of the sealing jig for entrance sides of the green honeycomb molded object which has a hexagonal cell which concerns on 5th Embodiment was expanded. It is sectional drawing to which the site | part corresponding to the part A of FIG. 3 of the sealing jig for entrance sides of the green honeycomb molded object which has a hexagonal cell which concerns on 5th Embodiment was expanded. It is the perspective view which expanded the site | part corresponding to the part A of FIG. 3 of the closing jig for the exit side of the green honeycomb molded object which has a hexagonal cell which concerns on 5th Embodiment. It is the top view to which the site | part corresponding to the part A of FIG. 3 of the sealing jig for exit sides of the green honeycomb molded object which has a hexagonal cell which concerns on 5th Embodiment was expanded. It is sectional drawing corresponding to the cross section by the XVI-XVI line of FIG. 16 in the sealing process by the side of the exit which concerns on 5th Embodiment. It is sectional drawing corresponding to the cross section by the XVIII-XVIII line | wire of FIG. 18 in the sealing process by the side of the exit which concerns on 5th Embodiment. It is sectional drawing corresponding to the cross section by the XX-XX line of FIG. 20 in the sealing process by the side of the exit which concerns on 5th Embodiment. It is the perspective view which expanded the site | part corresponding to the part A of FIG. 3 of the closing jig for the exit side of the green honeycomb molded object which has a hexagonal cell which concerns on 6th Embodiment. It is the top view to which the site | part corresponding to the part A of FIG. 3 of the sealing jig for exit sides of the green honeycomb molded object which has a hexagonal cell which concerns on 6th Embodiment was expanded. It is sectional drawing corresponding to the cross section by the XVI-XVI line of FIG. 16 in the sealing process by the side of the exit which concerns on 6th Embodiment. It is sectional drawing corresponding to the cross section by the XVIII-XVIII line | wire of FIG. 18 in the sealing process by the side of the exit which concerns on 6th Embodiment. It is sectional drawing corresponding to the cross section by the XX-XX line of FIG. 20 in the sealing process of the exit side which concerns on 6th Embodiment. (A) is a perspective view of a green honeycomb molded body having hexagonal cells having different opening areas on the inlet side and the outlet side before sealing, and (b) is a partially enlarged view of (a). It is a figure which shows the hexagonal cell of the same opening area by the entrance side and an exit side. The perspective view which expanded the site | part corresponding to the part A of FIG. 3 of the sealing jig for entrance sides of the green honeycomb molded object which has a hexagonal cell of a different opening area by the entrance side and exit side which concern on 7th Embodiment. FIG. The plane which expanded the site | part corresponding to the part A of FIG. 3 of the sealing jig for entrance sides of the green honeycomb molded object which has a hexagonal cell of an opening area which is different in the entrance side and exit side which concern on 7th Embodiment. FIG. It is sectional drawing corresponding to the cross section by the XX line of FIG. 9 in the sealing process by the side of the inlet_port | entrance which concerns on 7th Embodiment. It is sectional drawing corresponding to the cross section by the XII-XII line of FIG. 11 in the sealing process by the side of the inlet_port | entrance which concerns on 7th Embodiment. It is sectional drawing corresponding to the cross section by the XIV-XIV line | wire of FIG. 13 in the sealing process by the side of the inlet_port | entrance which concerns on 7th Embodiment. It is sectional drawing corresponding to the cross section by the XVI-XVI line of FIG. 16 in the sealing process by the side of the exit which concerns on 7th Embodiment. It is sectional drawing corresponding to the cross section by the XVIII-XVIII line | wire of FIG. 18 in the sealing process by the side of the exit which concerns on 7th Embodiment. It is sectional drawing corresponding to the cross section by the XX-XX line of FIG. 20 in the sealing process by the side of the exit which concerns on 7th Embodiment. It is sectional drawing corresponding to the cross section by the XVI-XVI line | wire of FIG. 16 in the sealing process of the exit side of another aspect which concerns on 7th Embodiment. It is sectional drawing corresponding to the cross section by the XIII-XIII line | wire of FIG. 18 in the sealing process of the exit side of another aspect which concerns on 7th Embodiment. It is sectional drawing corresponding to the cross section by the XX-XX line of FIG. 20 in the sealing process of the exit side of another aspect which concerns on 7th Embodiment. It is a longitudinal cross-sectional view which shows the green honeycomb molded object sealed by the jig | tool for sealing which concerns on 8th Embodiment, and the jig | tool for sealing. It is a perspective view which shows the sealed green honeycomb molded object which concerns on 8th Embodiment. It is a longitudinal cross-sectional view which shows the green honeycomb molded object sealed by the jig | tool for sealing which concerns on 9th Embodiment, and the jig | tool for sealing. It is a perspective view which shows the sealed green honeycomb molded object which concerns on 9th Embodiment.

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

[First Embodiment]
(Green honeycomb molded body (hexagonal cell))
First, a green honeycomb molded body to be processed in the first embodiment of the present invention will be described. As shown in FIG. 1A, a green honeycomb molded body 70 according to the present embodiment has, for example, an upper surface 71a, a lower surface 71b, and side surfaces 71c, and a plurality of hexagonal through holes are formed on the upper surface 71a and the lower surface 71b. A certain hexagonal cell 70h is a cylindrical body arranged substantially in parallel. The green honeycomb formed body 70 is an unfired formed body that becomes a porous ceramic when fired later. Further, the length of the green honeycomb molded body 70 in the direction in which the hexagonal cells 70h extend is not particularly limited, but may be 40 to 400 mm, for example. Further, the outer diameter of the green honeycomb molded body 70 is not particularly limited, but may be, for example, 10 to 360 mm.

  Each of the hexagonal cells 70h is separated by a partition wall 70W extending substantially parallel to the central axis of the green honeycomb molded body 70. As thickness of partition 70W, 0.8 mm or less is preferred, 0.5 mm or less is more preferred, and 0.1 mm or more is preferred. The external shape of the green honeycomb molded body 70 is not limited to a cylindrical body, but is an elliptical column or a rectangular column (for example, a regular polygonal column such as a triangular column, a quadrangular column, a hexagonal column, or an octagonal column, a triangular column other than a regular polygonal column, or a rectangular column. However, in the present embodiment, a case where the honeycomb structure 70 is a cylindrical body will be described. Further, in this embodiment, the green honeycomb molded body 70 having hexagonal cells 70h which are regular hexagonal through holes is given as an example. However, in the present embodiment, hexagonal shapes other than regular hexagons or through holes having hexagonal shapes of different sizes are used. A green honeycomb molded body 70 having a certain cell may be used.

  Such a green honeycomb molded body 70 is manufactured by extruding a ceramic composition with an extruder. In this case, in order to prepare the ceramic composition, an inorganic compound source powder that is a ceramic raw material, an organic binder, a solvent, and an additive that is added as necessary are prepared.

  The inorganic compound source powder includes two or more selected from the group consisting of aluminum source powder, magnesium source powder, silicon source powder and titanium source powder, or silicon carbide source powder, silicon nitride source powder and aluminum nitride What contains any 1 type or more among source powders is mentioned. In order to improve the heat resistance and mechanical strength of the product, any one or more of a carbon source powder, a zirconium source powder, a molybdenum source powder, and a calcium source powder may be added to the inorganic compound source powder. In particular, it is preferable to include an aluminum source powder, a magnesium source powder, a titanium source powder, and a silicon source powder because the heat resistance can be improved. Examples of the organic binder include celluloses such as methylcellulose, carboxymethylcellulose, hydroxyalkylmethylcellulose, and sodium carboxymethylcellulose; alcohols such as polyvinyl alcohol; and lignin sulfonate. Examples of the additive include a pore-forming agent, a lubricant and a plasticizer, a dispersant, and a solvent.

  The prepared raw material is mixed by a kneader or the like to obtain a raw material mixture, and the obtained raw material mixture is extruded from an extruder having an outlet opening corresponding to the cross-sectional shape of the partition wall 70W, thereby forming the green honeycomb according to the present embodiment. The body is manufactured.

(Vibrating sealing machine)
Hereinafter, the vibration type sealing machine of this embodiment will be described. As shown in FIG. 2, the vibration sealing machine 300 according to this embodiment includes a vibrator unit 320 and a sealing jig 400. The vibrator unit 320 generates vibrations having a frequency of 1 kHz or less, more preferably 100 Hz or less, for example, 77 Hz, which does not reach the ultrasonic frequency. When the sealing jig 400 is supplied from the vibrator unit 320, the sealing jig 400 is vibrated at a frequency of about 1 kHz to 60 Hz.

(Sealing jig)
Hereinafter, the sealing jig of this embodiment will be described. In this embodiment, the hexagonal cells 70h are sealed in different manners at both end faces of the green honeycomb molded body 70 having the hexagonal cells 70h. First, a sealing jig for sealing the upper surface 71a on the exhaust gas supply side (inlet side) when the green honeycomb molded body 70 is made into a diesel particle filter after firing will be described.

  As shown in FIG. 3, the sealing jig 400 of the present embodiment includes a sealing surface 401 a for sealing the green honeycomb molded body 70 and a support socket portion in which an end of the green honeycomb molded body 70 is fitted. 450. The sealing surface 401a is arranged at a position corresponding to a part of the hexagonal cell 70h, and is inserted into a part of the hexagonal cell 70h, thereby pressure-bonding the partition walls 70W to seal the hexagonal cell 70h. A plurality of sealing projections 410a are provided. The support socket portion 450 is formed of a cylindrical concave portion corresponding to the diameter of the green honeycomb molded body 70 to be sealed. The inner peripheral surface of the support socket 450 is provided with an inclined surface 451 so that the inner diameter of the support socket portion 450 increases as the distance from the sealing surface 401a increases so that the end of the green honeycomb molded body 70 can be easily inserted.

  As shown in FIGS. 4 to 6 in which the portion A of FIG. 3 is enlarged, the sealing projection 410a has a triangular pyramid base portion 411 and a conical tip portion 412. The triangular pyramidal base 411 is located at the base of the sealing projection 410a and protrudes from the sealing surface 401a. The triangular pyramid base portion 411 has a triangular frustum shape obtained by removing a triangular pyramid that is similarly reduced from a triangular pyramid having a larger apex angle than the conical tip portion 412. The conical tip portion 412 is located at the top portion of the triangular pyramid base portion 411, which is the tip portion of the sealing projection 410a. The conical tip 412 has a conical shape having a bottom surface corresponding to the upper surface of the triangular pyramid base 411. The apex angle of the conical tip 412 is smaller than the apex angle formed by the side of the triangular frustum of the triangular pyramid base 411.

  The triangular pyramid base 411 includes a triangular pyramid side surface 413 on the side surface of the triangular frustum and a round chamfered side portion 415 on the side of the triangular frustum. The round chamfered side portion 415 is rounded with a predetermined curvature on each side of the triangular frustum. In addition, a valley between the triangular pyramidal base portions 411 of the adjacent sealing projections 410a includes a round chamfered valley portion 414 that is a concave portion that is rounded with a predetermined curvature.

  As shown in FIG. 5, each of the sealing protrusions 410 a has a top of the conical tip 412 centered on one hexagonal cell 70 h of the plurality of hexagonal cells 70 h of the green honeycomb molded body 70. It arrange | positions so that it may become a position corresponding to the six hexagonal cells 70h which adjoin each circumference | surroundings. Further, each of the sealing projections 410a is arranged in such a direction that the round chamfered side portion 415 of the triangular pyramidal base portion 411 contacts the partition wall 70W when the sealing projection 410a is vibrated by the vibrator portion 320. Yes. The size of each of the triangular pyramidal base portions 411 is such that the length of the range in which the rounded chamfered side portion 415 vibrates on the sealing surface 401a when the sealing projection 410a is vibrated by the vibrator portion 320 is the green honeycomb. The length is shorter than the length between the centers of adjacent hexagonal cells 70 h of the molded body 70.

  On the other hand, a sealing jig 400 for sealing the lower surface 71b on the exhaust gas exhaust side (exit side) when the green honeycomb molded body 70 is used as a diesel particle filter after firing will be described. As shown in FIG. 7, the sealing surface 401b for sealing the lower surface 71b is provided with a conical sealing projection 410b. The sealing projection 410b has a conical side surface portion 422. Similar to the sealing surface 401a, a valley between adjacent sealing projections 410b includes a round chamfered valley portion 414 that is a concave portion that is rounded with a predetermined curvature. Note that the conical sealing projection 410b may have a truncated cone shape obtained by removing a cone that is similarly reduced from the tip.

  As shown in FIG. 7, each of the sealing protrusions 410b is surrounded by six adjacent hexagonal cells 70h around each of the tops of the hexagonal cells 70h of the green honeycomb molded body 70. It is arranged so as to be in a position corresponding to one hexagonal cell 70h. One hexagonal cell 70h in which the sealing protrusion 410b is located corresponds to one hexagonal cell 70h surrounded by six adjacent hexagonal cells 70h in the position corresponding to the sealing protrusion 410a on the upper surface 71a. This is cell 70h.

  Therefore, on the upper surface 71a, the sealing projection 410a is inserted into the six hexagonal cells 70h adjacent to each other around the hexagonal cell 70h, and on the lower surface 71b, the sealing projection 410a is inserted on the upper surface 71a. The sealing protrusion 410b is inserted into one hexagonal cell 70h surrounded by six inserted hexagonal cells 70h. The size of each of the sealing projections 410b is such that the radius of the range in which the bottom surface of the sealing projection 410b vibrates when the sealing projection 410b is vibrated by the vibrator portion 320 is the hexagonal cell of the green honeycomb molded body 70. The length between opposite sides of 70h is set to be slightly shorter than that.

(Cutting process)
Hereinafter, the cutting process of the green honeycomb molded body 70 of the present embodiment will be described. As shown in FIG. 8, the green honeycomb molded body 70 according to the present embodiment is manufactured by extruding the raw material mixture prepared as described above from an extruder 100 having an outlet opening corresponding to the cross-sectional shape of the partition wall 70W. Is done.

  The extruded green honeycomb molded body 70 is supported by the cradle 120 every time it is extruded by a predetermined length. Each of the cradle 120 supporting the green honeycomb molded body 70 is sequentially conveyed on the roller conveyor 140 in the direction in which the green honeycomb molded body 70 is pushed out. The conveyed green honeycomb molded body 70 is cut into a predetermined length by the cutting blade 240 so as to form an upper surface 71a and a lower surface 71b perpendicular to the side surface 71c. The green honeycomb molded body 70 may be cut with a wire instead of the cutting blade 240.

(Sealing process)
Hereinafter, the sealing step of the green honeycomb molded body 70 of the present embodiment will be described. First, the sealing step of the upper surface 71a on the exhaust gas supply side (inlet side) when the green honeycomb molded body 70 is made into a diesel particle filter after firing will be described.

  As shown in FIG. 9, the end on the upper surface 71 a side of the green honeycomb molded body 70 is inserted into the support socket portion 450 of the sealing jig 400 of the vibration sealing machine 300. The sealing jig 400 is vibrated by the vibrator portion 320. The tip of the sealing projection 410a on the sealing surface 401a is inserted into a part of the hexagonal cell 70h. As shown in FIG. 10, the conical tip portion 412 of the sealing projection 401a is inserted into the six hexagonal cells 70h adjacent to each other around the hexagonal cell 70h as a center, and a broken line in the figure. It is vibrated in the range shown by.

  As shown in FIG. 11, when the sealing protrusion 410a is further inserted into the hexagonal cell 70h, the triangular pyramid base 411 of the sealing protrusion 410a is inserted into the hexagonal cell 70h as shown in FIG. Each of the rounded chamfered side portions 415 of the triangular pyramidal base portion 411 is brought into contact with the partition wall 70W. Since the sealing projection 410a is vibrated, the partition wall 70W is pressurized by the sealing projection 410a, and the sealing projection 410a at the center of each of the six hexagonal cells 70h into which the sealing projections 410a are inserted is inserted. The hexagonal cell 70h that has not been pressed is pressed to seal.

As shown in FIG. 13, when the sealing protrusion 410a is further inserted into the hexagonal cell 70h, as shown in FIG. The partition walls 70 </ b> W pressed from the direction are integrally pressed together. The end of the pressure-bonded partition wall 70 </ b> W is brought into contact with the round chamfered valley portion 414 of the sealing surface 401 a, and the rounded partition wall joining end portion 73 is formed in a state where the round chamfering corresponding to the shape of the round chamfered valley portion 414 is made. The sealing is completed. As a result, on the upper surface 71a on the exhaust gas supply side (inlet side), one hexagonal cell 70h surrounded by six adjacent hexagonal cells 70h is sealed.
In addition, when the triangular pyramid side surface 413 of the triangular pyramid base 411 of the sealing jig 400 is not rounded but has a substantially planar shape, as shown in FIG. 15 instead of FIG. The thickness can be made substantially uniform.

  Next, the sealing step of the lower surface 71b that becomes the exhaust side (exit side) of exhaust gas when the green honeycomb molded body 70 is used as a diesel particle filter after firing will be described. As shown in FIG. 16, the end portion on the lower surface 71 b side of the green honeycomb molded body 70 is inserted into the support socket portion 450 of the sealing jig 400 of the vibration sealing machine 300. The sealing jig 400 is vibrated by the vibrator portion 320. The tip of the sealing projection 410b on the sealing surface 401b is inserted into a part of the hexagonal cell 70h. As shown in FIG. 17, a sealing projection 410b is inserted into one hexagonal cell 70h surrounded by six adjacent hexagonal cells 70h, and is vibrated within a range indicated by a broken line in the figure. . As described above, the hexagonal cell 70h into which the sealing protrusion 410b is inserted in the lower surface 71b is the hexagonal cell 70h in which the sealing protrusion 410a is not inserted into the upper surface 71a.

  As shown in FIG. 18, when the sealing protrusion 410b is further inserted into the hexagonal cell 70h, as shown in FIG. 19, the conical side surface portion 422 of the sealing protrusion 410b is brought into contact with the partition wall 70W. Since the sealing projection 410b is vibrated, the partition wall 70W is pressurized by the sealing projection 410b, and the sealing projection 410b intermediate the hexagonal cell 70h into which the sealing projection 410b is inserted is not inserted. It is pressed to seal the hexagonal cell 70h.

  As shown in FIG. 20, when the sealing protrusion 410b is further inserted into the hexagonal cell 70h, the partition walls 70W pressed by the conical side surface portion 422 of the sealing protrusion 410b are integrally pressed together as shown in FIG. Is done. The end of the pressure-bonded partition wall 70 </ b> W is brought into contact with the round chamfered valley portion 414 of the sealing surface 401 b, and the rounded partition wall joining end portion 73 is formed in a state where the round chamfering corresponding to the shape of the round chamfered valley portion 414 is made. The sealing is completed.

  As a result, on the lower surface 71b on the exhaust gas exhaust side (exit side), the six hexagonal cells 70h adjacent to each other around the one hexagonal cell 70h sealed by the upper surface 71a are sealed. In this way, after the sealing at the upper surface 71a and the lower surface 71b is completed, a honeycomb structure having the same shape as the green honeycomb molded body 70 is manufactured through a drying process and a firing process.

  In the present embodiment, there is provided a method for manufacturing a honeycomb structure in which a plurality of through-holes partitioned by partition walls are opened on end faces of pillars, and a plurality of hexagonal cells partitioned by partition walls 70W on end faces of the pillars. The green honeycomb molded body 70 that has an opening 70h and becomes a honeycomb structure by firing is extruded from a raw material and cut into a predetermined length, and then a plurality of hexagonal cells of the green honeycomb molded body 70 are formed. The sealing step includes sealing the hexagonal cell 70h by inserting the sealing jig 400 oscillated at a frequency of 1 kHz or less into a part of 70h to press-bond the partition walls 70W to each other.

  For this reason, the hexagonal cell 70h can be sealed very easily in the manufacture of the honeycomb formed body, and the sealing material injection and the use of a mask for selecting a sealing portion, which have been conventionally performed, are performed after the drying step. A precision cutting process becomes unnecessary. Further, since the sealing material and precision cutting waste are not required, the amount of material used can be reduced. In particular, since the sealing jig is vibrated at a frequency of 1 kHz or less, the partition wall can be easily crimped.

  Further, when the manufactured honeycomb structure is applied to a diesel particulate filter, the inlet of the gas flow path can be made wider than that of the conventional sealing method, so that the pressure loss can be reduced. As shown in FIG. 22A, the hexagonal cell 70h sealed with the conventional sealing material 70P has a drawback that the air resistance is large on the upper surface 71a on the exhaust gas supply side (inlet side). On the other hand, as shown in FIG. 22 (b), the upper surface 71a sealed by the manufacturing method of the present embodiment has a large gas channel inlet, and the ends of the sealed partition walls 70W are narrowed at the tip. Therefore, it can be seen that the air resistance is extremely reduced.

  Moreover, the hexagonal cell 70h of the green honeycomb molded body 70 immediately after being extruded from a raw material and cut into a predetermined length has a hexagonal shape. Therefore, when used as a diesel particle filter, in the gas flow path, many holes are opened with the length of the partition wall 70W shorter than that of the quadrilateral hole, and the diesel particle filter has more excellent characteristics. And can.

  In the present embodiment, the sealing protrusions 401a of the sealing jig 400 having a plurality of sealing protrusions 401a including a triangular frustum-like shape are arranged on the six hexagonal cells 70h adjacent to the six hexagonal cells 70h. By inserting each square cell 70h, the partition walls 70W are pressed together to seal the hexagonal cell 70h. For this reason, for example, the sealing protrusion 401a is inserted into the hexagonal cell 70h so that the side portions 415 of the plurality of triangular pyramidal sealing protrusions 401a abut against the partition wall 70W of the hexagonal cell 70h. Thus, one hexagonal cell 70h at the center can be easily sealed among the seven hexagonal cells 70h adjacent to each other. Therefore, when used as a diesel particle filter, it is possible to efficiently perform sealing on the side that becomes the inlet side.

  In the present embodiment, the sealing protrusion 401b of the sealing jig 400 having a plurality of conical sealing protrusions 401b is provided for each hexagonal cell 70h surrounded by six hexagonal cells 70h. Is inserted into the barrier rib 70h so that the hexagonal cells 70h are sealed. For this reason, for example, by inserting the sealing projection 401b into the hexagonal cell 70h such that the conical side surface portion 422 of the plurality of conical sealing projections 401b contacts the partition wall 70W of the hexagonal cell 70h, The surrounding six hexagonal cells 70h can be easily sealed among the seven hexagonal cells 70h adjacent to each other. Therefore, when used as a diesel particle filter, sealing on the side that becomes the outlet side can be performed efficiently.

  In the present embodiment, the hexagonal cells 70h are sealed by the sealing jig 400 having the rounded chamfered valley portions 414 in the valleys of the sealing protrusions 401a and 401b, so that the crimped partition walls 70W are rounded at the end surfaces. The hexagonal cell 70h is sealed so that a rounded partition wall junction end portion 73 having a round shape is formed. For this reason, when it uses as a diesel particulate filter, the air resistance in the junction part of partition 70W becomes small, and it becomes possible to reduce a pressure loss. Further, chipping or the like can be made difficult to occur in the joined round partition wall joining end portion 73.

[Second Embodiment]
(Green honeycomb molded body (square cell))
Hereinafter, a second embodiment of the present invention will be described. First, a green honeycomb molded body to be processed in the second embodiment of the present invention will be described. As shown in FIGS. 23 (a) and 23 (b), the green honeycomb molded body 70 according to the present embodiment has, for example, an upper surface 71a, a lower surface 71b, and side surfaces 71c, and a plurality of square shapes are formed on the upper surface 71a and the lower surface 71b. This is a cylindrical body in which square cells 70s that are through holes are arranged substantially in parallel. The green honeycomb molded body 70 is an unfired molded body that becomes a porous ceramic when fired later, and the configuration and manufacturing method other than the square cells 70s are the same as those of the green honeycomb molded body 70 having the hexagonal cells 70h. It is. The square cells 70s are separated by a partition wall 70w. The thickness of the partition wall 70w can be set to 0.15 to 0.76 mm, for example. The size of the square cell 70s can be set to 0.8 to 2.5 mm on a side, for example.

(Sealing jig)
Hereinafter, the sealing jig of this embodiment will be described. In the present embodiment, the sealing of the square cells 70s is performed in the same manner on both end faces of the green honeycomb molded body 70 having the square cells 70s. First, a sealing jig for sealing the upper surface 71a on the exhaust gas supply side (inlet side) when the green honeycomb molded body 70 is made into a diesel particle filter after firing will be described.

  As shown in FIGS. 24 and 25 in which the portion corresponding to the portion A of FIG. 3 is enlarged, the sealing jig 400 of the present embodiment is the same as the sealing surface of the sealing jig 40 of the first embodiment. 401c has a sealing projection 410c. The sealing projection 410 c has a quadrangular pyramid base 416 and a conical tip 412. The quadrangular pyramidal base 416 is located at the base of the sealing projection 410c and protrudes from the sealing surface 401c. The quadrangular pyramid base portion 416 has a quadrangular pyramid shape obtained by removing a quadrangular pyramid that is similarly reduced from a quadrangular pyramid having a larger apex angle than the conical tip portion 412. The conical tip 412 is located at the top of the quadrangular pyramid base 416, which is the tip of the sealing projection 410c. The conical tip portion 412 has a conical shape having a bottom surface corresponding to the upper surface of the quadrangular pyramid base portion 416. The apex angle of the conical tip 412 is smaller than the apex angle formed by the sides of the quadrangular pyramid of the quadrangular pyramid base 416.

  The quadrangular pyramid base 416 includes a quadrangular pyramid side portion 417 on the side surface of the quadrangular pyramid and a round chamfered side portion 415 on the side of the triangular frustum. The round chamfered side portion 415 is rounded with a predetermined curvature on each side of the quadrangular pyramid. Further, the valley between the quadrangular pyramidal base portions 416 of the adjacent sealing projections 410c includes a round chamfered valley portion 414 that is a concave portion that is rounded with a predetermined curvature.

  As shown in FIG. 25, each of the sealing protrusions 410 c has a conical tip portion 412 with a top portion around each square cell 70 s of the plurality of square cells 70 s of the green honeycomb molded body 70. The square cells 70s are arranged at positions corresponding to the four square cells 70s adjacent to each other across the partition wall 70w that partitions each side of the square cell 70s. Further, each of the sealing projections 410c is arranged in such a direction that the rounded chamfered side portion 415 of the quadrangular pyramidal base portion 416 contacts the partition wall 70w when the sealing projection 410c is vibrated by the vibrator portion 320. Yes. The size of each of the quadrangular pyramidal base portions 416 is such that the length of the range in which the rounded chamfered side portion 415 vibrates on the sealing surface 401c when the sealing projection 410c is vibrated by the vibrator portion 320 is the green honeycomb. The length between the opposite sides of the square cell 70s of the molded body 70 is set to be slightly shorter than that.

  In addition, when the green honeycomb molded body 70 is used as a diesel particle filter after firing, the sealing jig 400 for sealing the lower surface 71b on the exhaust gas exhaust side (exit side) is used as the sealing protrusion 410c on the upper surface 71a. A sealing jig 400 having a sealing surface 401c on which sealing projections 410c are arranged at positions corresponding to square cells 70s other than the square cell 70s corresponding to is used.

(Sealing process)
Hereinafter, the sealing step of the green honeycomb molded body 70 of the present embodiment will be described. After the cutting process similar to that in the first embodiment is performed, the green honeycomb formed body 70 is sealed. First, the sealing step of the upper surface 71a on the exhaust gas supply side (inlet side) when the green honeycomb molded body 70 is made into a diesel particle filter after firing will be described.

  As shown in FIG. 26, the end portion on the upper surface 71 a side of the green honeycomb molded body 70 is inserted into the support socket portion 450 of the sealing jig 400 of the vibration sealing machine 300. The sealing jig 400 is vibrated by the vibrator portion 320. The tip of the sealing projection 410c on the sealing surface 401c is inserted into a part of the square cell 70s. As shown in FIG. 27, with respect to four square cells 70s adjacent to each other with the partition wall 70w partitioning each side of the square cell 70s around the square cell 70s as a center, the conical shape of the sealing protrusion 401c is formed. The distal end portion 412 is inserted and is vibrated in a range indicated by a broken line in the drawing.

  As shown in FIG. 28, when the sealing protrusion 410c is further inserted into the square cell 70s, the quadrangular pyramid base 416 of the sealing protrusion 410c is inserted into the square cell 70s as shown in FIG. Each of the round chamfered side portions 415 of the quadrangular pyramid base 416 is brought into contact with the partition wall 70w. Since the sealing projection 410c is vibrated, the partition wall 70W is pressurized by the sealing projection 410c, and the sealing projection 410c at the center of each of the four square cells 70s into which the sealing projections 410c are inserted is inserted. It is pressed to seal the non-square cell 70s.

  As shown in FIG. 30, when the sealing projection 410c is further inserted into the square cell 70s, as shown in FIG. 31, the rounded chamfered side portion 415 and the quadrangular pyramid side portion 417 of the quadrangular pyramid base portion 416 provide four directions. The partition walls 70w pressed from each other are crimped together. The end of the pressure-bonded partition wall 70w is brought into contact with the rounded chamfered valley portion 414 of the sealing surface 401c, and the rounded partition wall junction end portion 73 is formed in a state where the rounded chamfering corresponding to the shape of the rounded chamfered valley portion 414 is made. The sealing is completed. As a result, on the upper surface 71a on the exhaust gas supply side (inlet side), one square cell surrounded by four square cells 70s adjacent to each other across the partition wall 70w partitioning each side of the square cell 70s. 70s is sealed.

  On the other hand, when the green honeycomb molded body 70 is used as a diesel particle filter after firing, the sealing process of the upper surface 71b on the exhaust gas exhaust side (exit side) is other than the square cell 70s corresponding to the sealing protrusion 410c on the upper surface 71a. The sealing is performed in the same manner as described above using the sealing jig 400 having the sealing surface 401c in which the sealing projections 410c are arranged at positions corresponding to the square cells 70s. Thereby, square cells 70s other than the square cell 70s sealed by the upper surface 71a are sealed by the lower surface 71b. In this way, after the sealing at the upper surface 71a and the lower surface 71b is completed, a honeycomb structure having the same shape as the green honeycomb molded body 70 is manufactured through a drying process and a firing process.

  According to the present embodiment, the sealing projection 410c sandwiches the partition wall 70w that divides each side of the square cell 70s around the one square cell 70s of the plurality of square cells 70s each having a square shape. The quadrangular pyramid base portion 416 is formed by removing a quadrangular pyramid that is similarly reduced from a quadrangular pyramid having a larger apex angle than the conical tip portion 412. It has a truncated pyramid shape, and its round chamfered side portion 415 contacts the partition wall 70w. Therefore, the sealing projections 410c are inserted into the four square cells 70s adjacent to each other with the partition wall 70w partitioning each side of the square cell 70s around the square cell 70s as the center. The square cell 70s at the center of the four square cells 70s is pressed by the rounded chamfered side portion 415 of the quadrangular pyramidal base portion 416 of the inserted sealing projection 410c, and the partition walls 70w are pressed and sealed. . In this case, for example, by sealing the square cell 70s that is not sealed at one end of the green honeycomb molded body 70 at the other end, for example, when the honeycomb structure is used for a diesel particle filter, Sealing on the exhaust gas supply side and exhaust side can be performed efficiently. Furthermore, the sealing surface 401a and the sealing surface 401b of the sealing jig 400 are mechanically parallel, and the sealing surface 401a of the sealing jig 400 corresponds to the normal positions of the square cells 70s on the upper surface 71a and the lower surface 71b. Since the sealing surface 401b and the sealing surface 401b are respectively arranged, correction of deformation generated in the extrusion process and the cutting process described above and sealing are performed simultaneously.

[Third Embodiment]
Hereinafter, a third embodiment of the present invention will be described. As shown in FIG. 32, in this embodiment, the hexagonal cells 70h on the upper surface 71a and the lower surface 71b of the green honeycomb molded body 70 having the hexagonal cells 70h are simultaneously sealed. A sealing jig 400 having a sealing surface 401a on the upper surface 71a is brought into contact with the green honeycomb molded body 70 that has been cut in the same manner as in the first embodiment, as in the first embodiment, A sealing jig 400 having a sealing surface 401b is brought into contact with the lower surface 71b. Thereafter, as shown in FIGS. 33 and 34, the sealing step proceeds in the same manner as in the first embodiment. Thereby, sealing is performed on each of the upper surface 71a and the lower surface 71b as in the first embodiment. In this way, after the sealing at the upper surface 71a and the lower surface 71b is completed, a honeycomb structure having the same shape as the green honeycomb molded body 70 is manufactured through a drying process and a firing process.

  According to the present embodiment, in the sealing step, both hexagonal cells 70h on the upper surface 71a and the lower surface 71b of the green honeycomb molded body 70 are simultaneously sealed. For this reason, the hexagonal cell 70h can be sealed more efficiently than the method of sealing the hexagonal cell 70h for each of the upper surface 71a and the lower surface 71b.

  The pressure loss due to the turbulence of the exhaust gas flow becomes more problematic on the upper surface 71a on the exhaust gas supply side (inlet side), and is not as problematic on the lower surface 71b on the exhaust gas exhaust side (outlet side). Therefore, it is not necessary to seal both the upper surface 71a and the lower surface 71b using the vibration sealing machine 300 as in the present embodiment, and the partition wall 70W is separated by the vibration sealing machine 300 at least on one side of the upper surface 71a. The hexagonal cell 70h can be sealed by pressure bonding.

[Fourth Embodiment]
(Sealing jig)
The fourth embodiment of the present invention will be described below. As shown in FIGS. 35 and 36, the sealing jig 400 ′ for the lower surface 71b of the green honeycomb molded body 70 of the present embodiment includes a state in which the sealing protrusion 410b is accommodated inside the sealing surface 401b, and the sealing surface. It is possible to selectively change the state in which the sealing protrusion 410b protrudes outside the 401b. The sealing projection 410b is arranged in the same manner as in the first embodiment, and is accommodated inside the sealing surface 401b and projected outside the sealing surface 401b through a hole having the same diameter as the bottom surface of the sealing projection 410b. Is free. The sealing protrusion 410b can be accommodated and protruded by a pneumatic or hydraulic mechanism.

  In addition, the round chamfer valley part 414 similar to the said 1st Embodiment remains on the sealing surface 401b in the state which accommodated the processus | protrusion 410b for sealing, and it does not necessarily need to become a perfect plane. The above configuration is the same for the sealing jig 400 ′ for the upper surface 71 a of the green honeycomb molded body 70.

(Cutting process)
Hereinafter, the cutting process of the green honeycomb molded body 70 of the present embodiment will be described. As shown in FIG. 37, the lower surface 71b of the green honeycomb molded body 70 having the hexagonal cells 70h immediately after being vertically extruded from the raw material by the extruder 100 is supported by the sealing surface 401b of the sealing jig 400 ′. To do. At this time, the sealing jig 400 ′ is in a state in which the sealing protrusion 410b is accommodated inside the sealing surface 401b. Next, as shown in FIG. 38, the green honeycomb molded body 70 is cut by the cutting blade 240 in a state where the green honeycomb molded body 70 is supported by the sealing jig 400 ′. The green honeycomb molded body 70 may be cut with a wire instead of the cutting blade 240.

(Sealing process)
Next, the sealing process of the green honeycomb molded body 70 of the present embodiment will be described. As shown in FIGS. 39 and 40, the upper surface 71a cut in the cutting step is supported by the sealing surface 401a of the sealing jig 400 ′. At this time, the sealing jig 400 ′ is in a state in which the sealing protrusion 410a is accommodated inside the sealing surface 401a.

  Next, as shown in FIG. 41, the sealing protrusions 410a and 410b protrude from the sealing surfaces 401a and 401b of the sealing jig 400 ′, respectively, and the sealing protrusions 410a and 410b are formed in the hexagonal cell 70h. By inserting each into the part, the hexagonal cell 70h is sealed as in the first embodiment.

  As described above, the pressure loss due to the turbulence of the exhaust gas flow becomes more problematic on the upper surface 71a on the exhaust gas supply side (inlet side), and the upper surface 71a on the lower surface 71b on the exhaust gas exhaust side (outlet side). is not a problem. Therefore, it is not necessary to seal both the upper surface 71a and the lower surface 71b using the vibration sealing machine 300 as in the present embodiment, and the partition wall 70W is separated by the vibration sealing machine 300 at least on one side of the upper surface 71a. The hexagonal cells 70h may be sealed by pressure bonding. In this case, sealing is performed with a sealing jig 400 ′ having a sealing surface 401a on the lower surface 71b, and a sealing material similar to the conventional one is used for the hexagonal cell 70h that is not sealed on the lower surface 71b. Can be sealed. In this way, after the sealing at the upper surface 71a and the lower surface 71b is completed, a honeycomb structure having the same shape as the green honeycomb molded body 70 is manufactured through a drying process and a firing process.

  If the diameter of the green honeycomb molded body 70 is increased, bending due to gravity increases when the green honeycomb molded body 70 is extruded from the raw material in the horizontal direction, and it may be difficult to support the green honeycomb molded body 70 on the side surface 71c. is there. However, according to the present embodiment, the lower surface 71b of the green honeycomb molded body 70 immediately after being extruded vertically downward from the raw material by the extruder 100 is supported by the sealing jig 400 '. Thereby, even the large-diameter green honeycomb molded body 70 can support the green honeycomb molded body 70 without causing bending or distortion of the hexagonal cells 70h. Further, in the subsequent sealing step, the plurality of sealing projections 410a and 410b of the sealing jig 400 ′ are respectively inserted into a part of the hexagonal cell 70h of the green honeycomb molded body 70 after being supported. The hexagonal cells 70h are sealed by pressing 70W together. Thereby, support and sealing of the green honeycomb molded object 70 can be performed continuously and efficiently.

  Further, according to the present embodiment, the sealing jig 400 ′ includes a state in which the sealing protrusion 410b is accommodated inside the sealing surface 401b and a state in which the sealing protrusion 410b protrudes outside the sealing surface 401b. Immediately after being extruded from the raw material vertically downward by the extruder 100 by the sealing surface 401b of the sealing jig 400 ′ in a state in which the sealing projection 410b is accommodated inside the sealing surface 401b. The lower surface 70b of the green honeycomb molded body 70 is supported. For this reason, even with the large-diameter green honeycomb molded body 70, the green honeycomb molded body 70 can be supported more stably without causing bending or distortion of the hexagonal cells 70h. Further, in the sealing step, the sealing protrusion 410b of the sealing jig 400 ′ in a state where the sealing protrusion 410b protrudes outside the sealing surface 401b is part of the hexagonal cell 70h on the lower surface 71b of the green honeycomb molded body 70. By inserting each into the wall, the partition walls 70W are crimped to seal the hexagonal cell 70h. Thus, the hexagonal cells 70h can be sealed by pressing the partition walls 70W while supporting the green honeycomb molded body 70.

[Fifth Embodiment]
(Sealing jig)
The fifth embodiment of the present invention will be described below. In this embodiment, a triangular pyramid-shaped sealing projection is used as the sealing jig for the inlet side, and a hexagonal frustum-shaped sealing projection is used as the sealing jig for the outlet side. Is different. As shown in FIG. 42 to FIG. 44 in which the portion corresponding to the portion A in FIG. 3 of the sealing jig for the inlet side of the green honeycomb molded body having hexagonal cells according to the fifth embodiment is enlarged. The sealing projection 410d in the form has a triangular pyramid shape as a whole. The sealing projection 410d includes a triangular pyramid side surface portion 413 on the side surface of the triangular pyramid and a round chamfered side portion 415 on the side edge of the triangular pyramid. The rounded chamfered side portion 415 is rounded with a predetermined curvature on each side of the triangular pyramid. Further, the valley between adjacent sealing projections 410d includes a round chamfered valley portion 414 that is a concave portion that is rounded with a predetermined curvature.

  As shown in FIG. 43, each of the sealing projections 410d has a top portion adjacent to each other around the hexagonal cell 70h of the plurality of hexagonal cells 70h of the green honeycomb molded body 70, respectively. It arrange | positions so that it may become a position corresponding to the two hexagonal cells 70h. Further, each of the sealing projections 410d is arranged in such a direction that the round chamfered side portion 415 contacts the partition wall 70W when the sealing projection 410d is vibrated by the vibrator portion 320. The size of each of the sealing projections 410d is such that when the sealing projection 410d is vibrated by the vibrator portion 320, the length of the range in which the rounded chamfered side portion 415 vibrates on the sealing surface 401a is determined as green honeycomb molding. The length is shorter than the length between the centers of adjacent hexagonal cells 70 h of the body 70. The sealing projection 410d of this embodiment can also be applied to the first and third embodiments described above.

  On the other hand, in the present embodiment, a sealing jig 400 for sealing the lower surface 71b on the exhaust side (exit side) of exhaust gas when the green honeycomb molded body 70 is used as a diesel particle filter after firing will be described. As shown in FIG. 45, the sealing surface 401b for sealing the lower surface 71b is provided with a hexagonal frustum-shaped sealing projection 410e. The sealing projection 410e has a hexagonal truncated cone-shaped tip portion 432 that includes a hexagonal flat surface at the tip. The sealing projection 410e has six hexagonal frustum-shaped side portions 433 and six hexagonal frustum-shaped side portions 435 between the hexagonal frustum-shaped side surfaces 433, respectively. The hexagonal frustum-shaped sealing projection 410e may have a hexagonal pyramidal shape without the hexagonal frustum-shaped tip 432.

  As shown in FIG. 46, each of the sealing projections 410e is surrounded by six adjacent hexagonal cells 70h at the top of each of the hexagonal cells 70h of the green honeycomb molded body 70. It is arranged so as to be in a position corresponding to one hexagonal cell 70h. Each of the hexagonal frustum-shaped side surfaces 433 of the sealing projection 410e is arranged to face each of the partition walls 70W of the hexagonal cell 70h. One hexagonal cell 70h in a position corresponding to the sealing protrusion 410e is one hexagonal cell surrounded by six adjacent hexagonal cells 70h in the position corresponding to the sealing protrusion 410d on the upper surface 71a. This is cell 70h.

  Therefore, as in the first and third embodiments, the sealing protrusion 410d is inserted into the six hexagonal cells 70h adjacent to each other around the hexagonal cell 70h on the upper surface 71a. On the lower surface 71b, the sealing projection 410e is inserted into one hexagonal cell 70h surrounded by six adjacent hexagonal cells 70h into which the sealing projection 410d is inserted on the upper surface 71a.

  In the present embodiment, each of the sealing projections 410e is arranged such that the hexagonal truncated cone side portions 435 are in contact with each other at the bottom thereof. Therefore, a valley equilateral triangular plane region 437 that is a region of an equilateral triangular plane is formed between the valleys of three sealing projections 410e adjacent to each other. As shown in FIG. 45 and FIG. 46, a valley concave portion 434 that is a hemispherical concave portion is formed in the valley regular triangular plane region 437 between the valleys of the three sealing projections 410 e adjacent to each other.

  The size of each of the sealing protrusions 410 e is such that the hexagonal truncated cone-shaped tip 432 is smaller than the hexagonal cells 70 h of the green honeycomb molded body 70. When the sealing projection 410e is vibrated by the vibrator portion 320, the lengths when the opposing hexagonal frustum-shaped side portions 435 at the bottom of each sealing projection 410e are closest to each other are two adjacent ones. The distance between the centers of the hexagonal cells 70h into which the sealing protrusions 410e are inserted is the same. Each of the sealing projections 410e of the present embodiment is formed of a metal such as tool steel or a synthetic resin. Since each of the sealing projections 410e of the present embodiment is arranged at an interval on the sealing surface 401b, it can be manufactured by wire cutting or the like.

(Sealing process)
Hereinafter, the sealing step of the green honeycomb molded body 70 of the present embodiment will be described. When the green honeycomb molded body 70 is used as a diesel particle filter after firing, the sealing process for the upper surface 71a on the exhaust gas supply side (inlet side) is the same as in the first and third embodiments described above. Is omitted.

  Hereinafter, the sealing step of the lower surface 71b which becomes the exhaust side (exit side) of exhaust gas when the green honeycomb molded body 70 is used as a diesel particle filter after firing will be described. As shown in FIG. 16, the end portion on the lower surface 71 b side of the green honeycomb molded body 70 is inserted into the support socket portion 450 of the sealing jig 400 of the vibration sealing machine 300. The sealing jig 400 is vibrated by the vibrator portion 320. The tip of the sealing projection 410e on the sealing surface 401b is inserted into a part of the hexagonal cell 70h. As shown in FIG. 47, a sealing projection 410e is inserted into one hexagonal cell 70h surrounded by six adjacent hexagonal cells 70h, and is vibrated within a range indicated by a broken line in the figure. . At this time, each of the hexagonal frustum-shaped side surfaces 433 of the sealing projection 410e faces the respective partition walls 70W of the hexagonal cell 70h. As described above, the hexagonal cell 70h into which the sealing projection 410e is inserted in the lower surface 71b is the hexagonal cell 70h in which the sealing projection 410d is not inserted into the upper surface 71a.

  As shown in FIG. 18, when the sealing protrusion 410e is further inserted into the hexagonal cell 70h, as shown in FIG. 48, the hexagonal frustum-shaped side surfaces 433 of the sealing protrusion 410e are brought into contact with the partition wall 70W. It is done. Since the sealing protrusion 410e is vibrated, the partition wall 70W is pressurized by the sealing protrusion 410e, and the sealing protrusion 410e intermediate the hexagonal cell 70h into which the sealing protrusion 410e is inserted is not inserted. It is pressed to seal the hexagonal cell 70h. At this time, the partition wall 70W of the hexagonal cell 70h to be sealed is pushed into the valley equilateral triangular plane region 437 between the valleys of the three sealing projections 410e adjacent to each other.

  As shown in FIG. 20, when the sealing protrusion 410e is further inserted into the hexagonal cell 70h, as shown in FIG. 49, the partition walls 70W pressed by the hexagonal frustum-shaped side surface 433 of the sealing protrusion 410e are In the equilateral triangular plane area 437 between the valleys of the three sealing protrusions 410e adjacent to each other, they are integrally pressed and molded into a triangular prism shape. The end of the pressure-bonded partition wall 70 </ b> W is pushed into the valley recess 434 in the valley regular triangle plane region 437 between the valleys of the three sealing projections 410 e adjacent to each other, and rounded chamfering corresponding to the shape of the valley recess 434 is made. Thus, the spherical partition wall joining end portion 74 is formed, and the sealing is completed. As a result, on the lower surface 71b on the exhaust gas exhaust side (exit side), the six hexagonal cells 70h adjacent to each other around the one hexagonal cell 70h sealed by the upper surface 71a are sealed. The sealing protrusion 410e of the present embodiment can be similarly applied to the first and third embodiments described above. In this way, after the sealing at the upper surface 71a and the lower surface 71b is completed, a honeycomb structure having the same shape as the green honeycomb molded body 70 is manufactured through a drying process and a firing process.

  In this embodiment, the sealing projection of the sealing jig 400 having the hexagonal frustum-shaped sealing projection 410e is provided for each hexagonal cell 70h surrounded by six hexagonal cells 70h. By inserting, the partition walls 70 </ b> W are pressed together to seal the hexagonal cells 70 h. For this reason, by inserting a plurality of hexagonal frustum-shaped sealing projections 410e into the same hexagonal hexagonal cell 70h, the surrounding six hexagonal cells 70h can be easily The hexagonal cell 70h can be sealed more smoothly. Therefore, when used as a diesel particle filter, sealing on the side that becomes the outlet side can be performed efficiently.

  In the present embodiment, the end of the pressure-bonded partition wall 70W is pressed into the valley equilateral triangular plane region 437 between the valleys of the three adjacent sealing projections 410e and molded into a triangular prism shape. The strength of the end portion of 70 W can be further improved. In this embodiment, the end of the pressure-bonded partition wall 70 </ b> W is pushed into the valley recess 434 in the valley equilateral triangular plane region 437 between the valleys of the three sealing projections 410 e adjacent to each other, and the spherical partition wall junction end 74. Therefore, the sealing can be performed more smoothly. Further, in the present embodiment, since the sealing protrusions 410e are disposed relatively far apart from each other, it is easy to manufacture by wire cutting or the like.

  Further, the hexagonal holes opened on the end face of the honeycomb structure after sealing are arranged at a relatively long distance particularly in the side portion, and the sealed portion becomes thick, so that higher strength is obtained. You can have it.

[Sixth Embodiment]
(Sealing jig)
The sixth embodiment of the present invention will be described below. This embodiment is different from the fifth embodiment in that hexagonal frustum-like sealing protrusions are densely arranged as a sealing jig for the outlet side. Note that, as the sealing jig for the entrance side, the triangular pyramid-shaped sealing projections used in the first embodiment and the fifth embodiment can be used, and thus description thereof is omitted.

  Hereinafter, in the present embodiment, a sealing jig 400 for sealing the lower surface 71b on the exhaust side (exit side) of exhaust gas when the green honeycomb molded body 70 is used as a diesel particle filter after firing will be described. As shown in FIG. 50, the sealing surface 401b for sealing the lower surface 71b is provided with a hexagonal frustum-shaped sealing projection 410f. Each of the sealing projections 410f of the present embodiment is similar to the sealing projection 410e of the fifth embodiment in that the hexagonal frustum-shaped tip portion 432, the hexagonal frustum-shaped side surface 433, and the hexagonal frustum-shaped side portion 435 Have. The hexagonal frustum-shaped sealing projection 410e may have a hexagonal pyramidal shape without the hexagonal frustum-shaped tip 432.

  As shown in FIG. 51, similarly to the fifth embodiment, each of the sealing protrusions 410f is adjacent to the periphery of each of the plurality of hexagonal cells 70h of the green honeycomb molded body 70, respectively. The hexagonal cells 70h are arranged so as to correspond to one hexagonal cell 70h surrounded by the six hexagonal cells 70h. However, unlike the fifth embodiment, each of the hexagonal frustum-shaped side portions 435 of the sealing projection 410f is disposed so as to face each of the partition walls 70W of the hexagonal cell 70h. Similarly to the fifth embodiment, one hexagonal cell 70h in which the sealing projection 410f is located corresponds to six adjacent hexagonal cells in which the sealing projections 410a and 410d correspond in the upper surface 71a. One hexagonal cell 70h is surrounded by 70h.

  Therefore, as in the first embodiment, the third embodiment, and the fifth embodiment, the upper surface 71a is sealed against the six hexagonal cells 70h that are adjacent to each other around the hexagonal cell 70h. The projections 410a and 410d for insertion are inserted, and the lower surface 71b is sealed against one hexagonal cell 70h surrounded by six adjacent hexagonal cells 70h into which the sealing projections 410a and 410d are inserted on the upper surface 71a. A projection 410f is inserted. In the present embodiment, each of the sealing projections 410f is arranged so that the hexagonal truncated cone-shaped side surfaces 433 are in contact with each other at the bottom. Therefore, in the present embodiment, unlike the fifth embodiment, a planar region is not formed in the valley of the sealing projection 410f.

  The size of each of the sealing projections 410 f is such that the hexagonal truncated cone-shaped tip 432 is smaller than the hexagonal cell 70 h of the green honeycomb molded body 70. When the sealing projection 410e is vibrated by the vibrator portion 320, the length when the opposing hexagonal frustum-shaped side surfaces 433 at the bottoms of the sealing projections 410f are closest to each other is the two adjacent sealing features. The distance between the centers of the hexagonal cells 70h into which the protrusions 410f are inserted is the same. Each of the sealing projections 410f of the present embodiment is formed of a metal such as tool steel or a synthetic resin. Each of the sealing protrusions 410f of the present embodiment can be manufactured by electric discharge machining or the like.

(Sealing process)
Hereinafter, the sealing step of the green honeycomb molded body 70 of the present embodiment will be described. When the green honeycomb molded body 70 is used as a diesel particle filter after firing, the sealing process for the upper surface 71a on the exhaust gas supply side (inlet side) is the same as in the first and third embodiments described above. Is omitted.

  Hereinafter, the sealing step of the lower surface 71b which becomes the exhaust side (exit side) of exhaust gas when the green honeycomb molded body 70 is used as a diesel particle filter after firing will be described. As shown in FIG. 16, the end portion on the lower surface 71 b side of the green honeycomb molded body 70 is inserted into the support socket portion 450 of the sealing jig 400 of the vibration sealing machine 300. The sealing jig 400 is vibrated by the vibrator portion 320. The tip of the sealing projection 410f on the sealing surface 401b is inserted into a part of the hexagonal cell 70h. As shown in FIG. 52, a sealing projection 410f is inserted into one hexagonal cell 70h surrounded by six adjacent hexagonal cells 70h, and is vibrated within a range indicated by a broken line in the figure. . At this time, each of the hexagonal frustum-shaped side portions 435 of the sealing projection 410f opposes each of the partition walls 70W of the hexagonal cell 70h. As described above, the hexagonal cell 70h into which the sealing protrusion 410f is inserted in the lower surface 71b is the hexagonal cell 70h in which the sealing protrusions 410a and 410d are not inserted into the upper surface 71a.

  As shown in FIG. 18, when the sealing projection 410f is further inserted into the hexagonal cell 70h, as shown in FIG. 53, each of the hexagonal truncated conical side portions 435 of the sealing projection 410f contacts the partition wall 70W. Touched. Since the sealing projection 410f is vibrated, the partition wall 70W is pressurized by the sealing projection 410f, and the sealing projection 410f intermediate the hexagonal cell 70h into which the sealing projection 410f is inserted is not inserted. It is pressed to seal the hexagonal cell 70h. At this time, the partition wall 70W of the hexagonal cell 70h to be sealed is pushed into the valleys of the three sealing protrusions 410f adjacent to each other.

  As shown in FIG. 20, when the sealing protrusion 410f is further inserted into the hexagonal cell 70h, the partition walls 70W pressed by the hexagonal frustum-shaped side portions 435 of the sealing protrusion 410f as shown in FIG. Are crimped together in the valleys of the three sealing projections 410f adjacent to each other to complete the sealing. As a result, on the lower surface 71b on the exhaust gas exhaust side (exit side), the six hexagonal cells 70h adjacent to each other around the one hexagonal cell 70h sealed by the upper surface 71a are sealed. Note that the sealing protrusion 410f of the present embodiment can be similarly applied to the first and third embodiments described above. In this way, after the sealing at the upper surface 71a and the lower surface 71b is completed, a honeycomb structure having the same shape as the green honeycomb molded body 70 is manufactured through a drying process and a firing process.

  In the present embodiment, the sealing is performed using the hexagonal frustum-shaped sealing projection 410f at the sealing of the lower surface 71b on the exhaust gas exhaust side (exit side). Then, since the hexagonal cell 70h that is not sealed on the lower surface 71b side of the green honeycomb molded body 70 is enlarged to a hexagonal shape similar to that before the sealing step, as shown in FIG. 54, the hexagonal cell 70h of the first embodiment is expanded. Thus, as compared with the case where it is enlarged in a circular shape, the sealing can be performed smoothly.

  Further, in the present embodiment, since the sealing protrusions 410f are densely arranged, the end portion of the pressure-bonded partition wall 70W can be made thin and small. Therefore, since the area of the sealed part becomes narrow, the pressure loss on the outlet side can be made smaller.

[Seventh Embodiment]
(Green honeycomb molded body (hexagonal cells with different opening areas on the inlet side and outlet side))
The seventh embodiment of the present invention will be described below. First, a green honeycomb molded body to be processed in the seventh embodiment of the present invention will be described. As shown in FIGS. 55 (a) and 55 (b), the green honeycomb molded body 70 according to the present embodiment has, for example, an upper surface 71a, a lower surface 71b, and side surfaces 71c, and a plurality of hexagonal shapes are formed on the upper surface 71a and the lower surface 71b. This is a cylindrical body in which an inlet side hexagonal cell 70Hin and an outlet side hexagonal cell 70Hout, which are through holes, are arranged substantially in parallel. The inlet side hexagonal cell 70Hin and the outlet side hexagonal cell 70Hout are separated by a partition wall 70w.

    As shown in FIG. 55 (b), on the upper surface 71a, one outlet-side hexagonal cell 70Hout and an opening smaller than the outlet-side hexagonal cell 70Hout adjacent to one outlet-side hexagonal cell 70Hout via a partition wall 70W. And six inlet side hexagonal cells 70Hin having an area. Note that the arrangement of the inlet side and the outlet side may be reversed. As shown in FIG. 56, the green honeycomb molded body 70 shown in the first embodiment is opened on the outlet side with respect to one inlet-side hexagonal cell 70hin opened on the inlet side on the upper surface 71a on the inlet side. Three outlet side hexagonal cells 70hout are in contact with each other. On the other hand, in this embodiment, two outlet-side hexagonal cells 70Hout are in contact with one inlet-side hexagonal cell 70Hin via a partition wall 70W. In the inlet side hexagonal cell 70Hin, the length of the partition wall 70W adjacent to the outlet side hexagonal cell 70Hout is longer than the length of the partition wall 70W adjacent to the other inlet side hexagonal cell 70Hin. In the inlet-side hexagonal cell 70Hin, the diameter in the direction sandwiched between the two outlet-side hexagonal cells 70Hout is shorter than the diameter in the direction sandwiched between the other two inlet-side hexagonal cells 70Hin.

  The green honeycomb molded body 70 is an unfired molded body that becomes a porous ceramic when fired later. The configuration and manufacturing method other than the inlet side hexagonal cell 70Hin and the outlet side hexagonal cell 70Hout are hexagonal cells. It is the same as the green honeycomb molded body 70 having 70h.

(Sealing jig)
As shown in FIG. 57 and FIG. 58 in which the portion corresponding to the portion A of FIG. 3 of the inlet side sealing jig according to the seventh embodiment is enlarged, the sealing protrusion 410i of the present embodiment has four as a whole. It has a pyramid shape. As can be seen from the plan view of FIG. 58, the bottom surface of the sealing projection 410i has a rhombus shape. The sealing projection 410i includes a quadrangular pyramid side portion 417 on the side surface of the quadrangular pyramid and a round chamfered side portion 415 on the side of the quadrangular pyramid. Since the bottom surface of the sealing projection 410i has a rhombus shape, the sealing projection 410i includes a long pair of rounded chamfered side portions 415 and a shorter pair of rounded chamfered side portions 415. The rounded chamfered side portion 415 is rounded with a predetermined curvature on each side of the quadrangular pyramid. Further, the valley between the adjacent sealing projections 410i includes a round chamfered valley portion 414 that is a concave portion that is rounded with a predetermined curvature. The sealing projection 410i may have a quadrangular frustum shape with the top portion cut off.

  As shown in FIG. 58, each of the sealing projections 410i is arranged such that the top portion thereof is at a position corresponding to the inlet side hexagonal cell 70Hin of the green honeycomb molded body 70. Further, each of the sealing projections 410i is arranged in a direction in which each of the longer round chamfered side portions 415 contacts the partition wall 70W of the outlet side hexagonal cell 70Hout. The size of each of the sealing protrusions 410i is such that the longer round chamfered side portion 415 is projected onto the sealing surface 401a from directly above the sealing surface 401a, and the length of the inlet side hexagonal cell 70Hin from the center of the inlet side hexagonal cell 70Hin. The length is shorter than the length to the center of the outlet side hexagonal cell 70Hout adjacent to the square cell 70Hin.

(Sealing process)
Hereinafter, the sealing step of the green honeycomb molded body 70 of the present embodiment will be described. First, the sealing step of the upper surface 71a on the exhaust gas supply side (inlet side) when the green honeycomb molded body 70 is made into a diesel particle filter after firing will be described.

  As shown in FIG. 9, the end on the upper surface 71 a side of the green honeycomb molded body 70 is inserted into the support socket portion 450 of the sealing jig 400 of the vibration sealing machine 300. The sealing jig 400 is vibrated by the vibrator portion 320. As shown in FIG. 59, the leading end of the sealing protrusion 410i of the sealing surface 401a is inserted into each of the inlet side hexagonal cells 70Hin with the longer round chamfered side portion 415 facing the partition wall 70W of the outlet side hexagonal cell 70Hout. Is done. The sealing projection 410i is vibrated within a range indicated by a broken line in the drawing.

  As shown in FIG. 11, when the sealing projection 410i is further inserted into the inlet side hexagonal cell 70Hin, as shown in FIG. 60, each of the longer round chamfered side portions 415 becomes the outlet side hexagonal cell 70Hout. It is made to oppose to the partition 70W. Since the sealing projection 410i is vibrated, the outlet side hexagonal cell 70Hout in which the sealing projection 410i at the center of the six inlet side hexagonal cells 70Hin into which the sealing projection 410i is inserted is not inserted is sealed. Pressed like so.

  As shown in FIG. 13, when the sealing protrusion 410i is further inserted into the inlet side hexagonal cell 70Hin, as shown in FIG. 61, it is pressed from six directions by the round chamfered side portion 415 and the quadrangular pyramid side portion 417. The partition walls 70W are crimped together. The end of the crimped partition wall 70 </ b> W is brought into contact with the rounded chamfered valley 414 of the sealing surface 401 a, and the sealing is completed in a state where the rounded chamfering corresponding to the shape of the rounded chamfered valley 414 is made. As a result, on the upper surface 71a on the exhaust gas supply side (inlet side), one outlet-side hexagonal cell 70Hout surrounded by six adjacent inlet-side hexagonal cells 70Hin is sealed.

  Next, the sealing step of the lower surface 71b on the exhaust gas supply side (exit side) when the green honeycomb molded body 70 is used as a diesel particle filter after firing will be described. In the sealing step on the outlet side, the sealing jig 400 having the sealing projection 410f used in the above-described sixth embodiment can be used. In the present embodiment, the distance between the centers of the adjacent sealing projections 410f on the sealing surface 401b corresponds to the distance between the centers of the adjacent outlet side hexagonal cells 70Hout.

  As shown in FIG. 16, the end portion on the lower surface 71 b side of the green honeycomb molded body 70 is inserted into the support socket portion 450 of the sealing jig 400 of the vibration sealing machine 300. The sealing jig 400 is vibrated by the vibrator portion 320. As shown in FIG. 62, the tips of the sealing protrusions 410f on the sealing surface 401b are inserted into the outlet side hexagonal cells 70Hout. As shown in FIG. 62, each hexagonal frustum-shaped side surface portion 433 of the sealing projection 410f is inserted so as to face each of the partition walls 70W of the outlet side hexagonal cell 70Hout. The sealing projection 410f is vibrated within a range indicated by a broken line in the drawing.

  As shown in FIG. 18, when the sealing projection 410f is further inserted into the outlet-side hexagonal cell 70Hout, as shown in FIG. 63, the hexagonal frustum-shaped side surface portion 433 of the sealing projection 410f is formed on the partition wall 70W. It is made to face. Since the sealing protrusions 410f are vibrated, the partition wall 70W has the inlet side hexagonal cells 70Hin not inserted with the sealing protrusions 410f in the middle of the outlet side hexagonal cells 70Hout into which the sealing protrusions 410f are inserted. Pressed to seal. At this time, the partition wall 70W of the inlet-side hexagonal cell 70Hin to be sealed is pushed into the valley between the three sealing protrusions 410f adjacent to each other.

  As shown in FIG. 20, when the sealing projection 410f is further inserted into the outlet-side hexagonal cell 70Hout, as shown in FIG. 64, the partition wall 70W pressed by the hexagonal frustum-shaped side portion 433 of the sealing projection 410f. The two are mutually crimped together in a valley between three sealing protrusions 410f adjacent to each other, and the sealing is completed. Thereby, on the lower surface 71b on the exhaust gas exhaust side (exit side), the six inlet side hexagonal cells 70Hin adjacent to each other around the one outlet side hexagonal cell 70Hout sealed by the upper surface 71a are sealed.

  On the other hand, in the sealing step on the outlet side, the sealing jig 400 having the sealing protrusion 410e used in the fifth embodiment described above can be used. In the present embodiment, the distance between the centers of adjacent sealing projections 410e on the sealing surface 401b corresponds to the distance between the centers of adjacent outlet-side hexagonal cells 70Hout.

  As shown in FIG. 16, the end portion on the lower surface 71 b side of the green honeycomb molded body 70 is inserted into the support socket portion 450 of the sealing jig 400 of the vibration sealing machine 300. The sealing jig 400 is vibrated by the vibrator portion 320. As shown in FIG. 65, the tip of the sealing projection 410e on the sealing surface 401b is inserted into each of the outlet side hexagonal cells 70Hout. As shown in FIG. 65, each of the hexagonal frustum-shaped side portions 435 of the sealing projection 410f is inserted so as to face each of the partition walls 70W of the outlet-side hexagonal cell 70Hout. The sealing projection 410e is vibrated within a range indicated by a broken line in the drawing.

  As shown in FIG. 18, when the sealing projection 410e is further inserted into the outlet side hexagonal cell 70Hout, as shown in FIG. 66, each of the hexagonal frustum-shaped side portions 435 of the sealing projection 410e has a partition wall 70W. It is made to face. Since the sealing projections 410e are vibrated, the partition wall 70W has the inlet side hexagonal cells 70Hin not inserted with the sealing projections 410e in the middle of the outlet side hexagonal cells 70Hout into which the sealing projections 410e are inserted. Pressed to seal. At this time, the partition wall 70 </ b> W of the inlet side hexagonal cell 70 </ b> Hin to be sealed is pushed into the valley equilateral triangular plane region 437 between the valleys of the three sealing projections 410 e adjacent to each other.

  As shown in FIG. 20, when the sealing projection 410e is further inserted into the outlet hexagonal cell 70Hout, the partition wall pressed by the hexagonal frustum-shaped side portion 435 of the sealing projection 410e as shown in FIG. 70Ws are integrally pressed in a valley equilateral triangular plane region 437 between the valleys of three sealing projections 410e adjacent to each other, and formed into a triangular prism shape. The end of the pressure-bonded partition wall 70 </ b> W is pushed into the valley recess 434 in the valley regular triangle plane region 437 between the valleys of the three sealing projections 410 e adjacent to each other, and rounded chamfering corresponding to the shape of the valley recess 434 is made. Thus, the spherical partition wall joining end portion 74 is formed, and the sealing is completed. Thereby, on the lower surface 71b on the exhaust gas exhaust side (exit side), the six inlet side hexagonal cells 70Hin adjacent to each other around the one outlet side hexagonal cell 70Hout sealed by the upper surface 71a are sealed. In this way, after the sealing at the upper surface 71a and the lower surface 71b is completed, a honeycomb structure having the same shape as the green honeycomb molded body 70 is manufactured through a drying process and a firing process.

  According to this embodiment, the green honeycomb molded body 70 has one outlet side hexagonal cell 70Hout and an opening smaller than the outlet side hexagonal cell 70Hout adjacent to the outlet side hexagonal cell 70Hout via the partition wall 70W. Groups of six inlet side hexagonal cells 70Hin having an area are adjacent to each other. Therefore, for example, when the green honeycomb structure 70 is applied to a diesel particle filter, the inlet side hexagonal cell 70Hin having a small opening area is sealed while the outlet side hexagonal cell 70Hout having a large opening area is sealed on the inlet side of the diesel particle filter. And opening-side hexagonal cells 70Hout having a large opening area are closed while sealing the inlet-side hexagonal cells 70Hin having a small opening area on the outlet side. The filtration area can be increased. For this reason, when it applies to a diesel particulate filter, the pressure loss when soot collects is small, and it can be set as the thing with high soot collection efficiency.

  Further, in the sealing step, the sealing protrusion 410i of the sealing jig 400 having a plurality of sealing protrusions 410i including a quadrangular pyramid shape having a rhombic bottom surface and a quadrangular pyramid shape is formed on the longer rounded chamfered side portion. By inserting 415 into the inlet-side hexagonal cell 70Hin while vibrating at a frequency of 1 kHz or less so that the 415 contacts the partition wall 70W of the outlet-side hexagonal cell 70Hout, the barrier ribs 70W are pressure-bonded to each other so that the outlet-side hexagonal cell Seal 70Hout. Thereby, the outlet side hexagonal cell 70Hout surrounded by the inlet side hexagonal cell 70Hin can be easily sealed. Therefore, when it is used as a diesel particulate filter, it can be made more excellent in characteristics particularly when applied to the inlet side.

[Eighth Embodiment]
The eighth embodiment of the present invention will be described below. As shown in FIG. 68, the above-described first to seventh points are formed in the joint portion between the partition walls 70W, wherein the partition wall extension joint portions 75 are formed by joining the partition walls 70W to each other in parallel over a predetermined length. This is different from the embodiment. The length of the partition extension joint 75 along the longitudinal direction of the green honeycomb molded body 70 is preferably at least equal to or greater than the thickness of the partition 70W, and more than twice the thickness of the partition 70W. More preferred. In the present embodiment, an extended joint forming groove 418 corresponding to the partition extended joint 75 is provided in the valley between the sealing protrusions 410g disposed on the sealing surface 401b. The extension joint forming groove 418 has parallel wall surfaces with a depth corresponding to the length of the partition extension joint 75. When, for example, the lower surface 71b of the green honeycomb molded body 70 having the hexagonal cells 70h is sealed with such a sealing jig having the sealing protrusion 410g, the shape of the hexagonal cells 70h after the sealing is shown in FIG. As shown. The sealing jig having the sealing protrusion 410g of the present embodiment can be applied to both the inlet side and outlet side sealings of the first to seventh embodiments. In this way, after the sealing at the upper surface 71a and the lower surface 71b is completed, a honeycomb structure having the same shape as the green honeycomb molded body 70 is manufactured through a drying process and a firing process.

  In the present embodiment, a partition extension joining portion 75 is formed in the joint portion between the partition walls 70W, in which the partition walls 70W are joined in parallel to each other over a predetermined length. For this reason, the partition walls 70 </ b> W are joined to each other over a larger range, and the strength of the sealing portion can be increased. Moreover, since the partition wall extension joint 75 extends over a predetermined length at the end of the unsealed hexagonal cell 70, there is little disturbance in the flow of exhaust gas, particularly on the inlet side to which exhaust gas is supplied. Thus, the pressure loss can be reduced.

[Ninth Embodiment]
(Sealing jig)
The ninth embodiment of the present invention will be described below. As shown in FIG. 70, the eighth embodiment is that a round partition extension joint end 76 similar to the round partition junction end 73 of the first embodiment is formed at the end of the partition extension joint 75. It is different from the form. In this embodiment, the partition extension joint 75 is formed in the valley between the sealing protrusions 410h arranged on the sealing surface 401b. A round chamfered valley portion 414 similar to that in the first embodiment is formed at the bottom of the partition extension joint 75. When, for example, the lower surface 71b of the green honeycomb molded body 70 having the hexagonal cells 70h is sealed by such a sealing jig having the sealing protrusions 410h, the shape of the hexagonal cells 70h after the sealing is shown in FIG. As shown. The sealing jig having the sealing projection 410h of the present embodiment can be applied to both the inlet side and outlet side sealings of the first to seventh embodiments. In this way, after the sealing at the upper surface 71a and the lower surface 71b is completed, a honeycomb structure having the same shape as the green honeycomb molded body 70 is manufactured through a drying process and a firing process.

  In the present embodiment, in addition to the effect of increasing the strength of the sealing portion in the eighth embodiment, since the rounded partition wall extension joint end portion 76 is formed, the end portions of the partition wall 70W are securely crimped to each other and sealing leakage occurs. When the honeycomb structure is used for a diesel particulate filter, the disturbance of the exhaust gas flow at the end face on the exhaust gas supply side is reduced, and the pressure loss can be reduced.

In the sealing step in the above first to ninth embodiments, in order to improve the deformation and weldability of the partition wall, a sealing jig may be additionally inserted once or a plurality of times into a predetermined opening as necessary. Alternatively, after the end portion after sealing is crushed flat, the sealing jig may be inserted again to adjust the shape of the sealing portion.
Alternatively, a sealing paste may be separately prepared and added to the cell before the sealing jig is inserted, or the paste is additionally applied to the sealing portion after drying or firing of the green honeycomb molded body, and then dried again. The firing process may be repeated.

  In the sealing jig used in the first to ninth embodiments, a part of the shape of the sealing protrusion may be different. Differences in the shape of the projections for sealing include differences in the cross-sectional shape of the projections, the length from the valley portion formed by adjacent projections to the tip of the projection, the spacing between the projections for sealing, etc. Two or more may be combined.

  The protrusions having different shapes may be arranged so as to have a distribution in one sealing jig, or may be concentrated on a specific place. Further, a plurality of sealing jigs made of differently shaped protrusions may be integrated and used as a single sealing jig.

  It is preferable that two or more kinds of protrusions having different shapes from the center of the sealing jig are arranged concentrically. In particular, when there are two protrusions with different shapes, the protrusions are different from each other inside and outside the circle drawn from the jig center with a radius of 1/4 to 3/4 of the distance from the center of the sealing jig to the outermost periphery. Is preferably arranged, and more preferably, different protrusions are arranged on the inside and outside of a circle drawn from the center of the jig with a radius of 1/3 to 2/3.

  Moreover, in each protrusion, it is preferable that the length from the valley part formed by adjacent protrusions to the tip of the protrusion is longer in the protrusion disposed in the outer peripheral part than in the center part.

  In general, the flow of exhaust gas tends to concentrate at the center of the end face of the honeycomb molded body, and the soot collection efficiency tends to decrease significantly due to local soot accumulation and the accompanying increase in pressure loss.

  In the honeycomb molded body sealed with the sealing jig having the shape and arrangement of the protrusions described above, the partition wall is deformed more greatly at the opening portion of the outer peripheral portion, and the exhaust gas can easily pass through the outer peripheral portion than the central portion. .

  The flow of exhaust gas in the honeycomb molded body becomes uniform, and it can be expected that pressure loss will be reduced and soot collection efficiency will be improved, and regeneration efficiency will also be improved by making soot combustion and temperature distribution uniform during honeycomb regeneration. I can expect.

The green honeycomb formed body that has finished the sealing step of the first to ninth embodiments is formed into a honeycomb formed body through a firing step after removing moisture in the formed body in the drying step.
For drying the green honeycomb molded body, hot air drying, microwave drying, reduced pressure, vacuum drying or the like is generally used. In particular, for drying the green honeycomb molded body, reduced pressure or vacuum drying that can efficiently discharge generated water vapor is preferable.
Further, from the viewpoint of protecting the shape of the opening / sealing portion at both ends of the green honeycomb molded body, it is preferable to place the molded body in the dryer in a horizontal position.

  In addition, this invention is not limited to the said embodiment, A various deformation | transformation aspect is possible.

70 ... green honeycomb molded body, 71a ... upper surface, 71b ... lower surface, 71c ... side surface, 70h ... hexagonal cell, 70Hin ... inlet side hexagonal cell, 70Hout ... outlet side hexagonal cell, 70hin ... inlet side hexagonal cell, 70hout ... exit side hexagonal cell, 70W ... partition wall, 70s ... square cell, 70w ... partition wall, 70P ... sealing material, 73 ... round partition wall junction end, 74 ... spherical partition wall junction end, 75 ... partition wall extension joint, 76 ... Round partition wall extension joint end, 100 ... extruder, 120 ... cradle, 140 ... roller conveyor, 240 ... cutting blade, 300 ... vibrating sealing machine, 320 ... vibrator part, 400 ... sealing jig, 400 ' ... Sealing jig, 401a, 401b, 401c ... Sealing surface, 410a, 410b, 410c, 410d, 410e, 410f, 410g, 410h, 410i ... Sealing Projection, 411 ... Triangular pyramidal base part, 412 ... Conical tip part, 413 ... Triangular pyramid side part, 414 ... Round chamfering valley part, 415 ... Round chamfering side part, 416 ... Square pyramidal base part, 417 ... Square pyramid side part , 418 ... extension joint forming groove, 422 ... conical side face part, 432 ... hexagonal frustum tip part, 433 ... hexagon frustum side face part, 434 ... valley recess, 435 ... hexagon frustum side part, 437 ... Valley regular triangle plane area, 450 ... Support socket part, 451 ... Inclined surface.

Claims (13)

A method for manufacturing a honeycomb structure in which a part of a plurality of through-holes opened at an end face of a column and partitioned by a partition wall is sealed,
A sealing jig oscillated at a frequency of 1 kHz or less is inserted into a part of the plurality of through-holes of the green honeycomb molded body in which a plurality of through-holes partitioned by partition walls are opened on the end face of the column body. The manufacturing method of a honeycomb structure including the sealing process of crimping | bonding the said partition walls and sealing the said through-hole by doing.   The method for manufacturing a honeycomb structure according to claim 1, wherein, in the sealing step, the through holes of the green honeycomb structure in which the plurality of hexagonal through holes are opened are sealed. The green honeycomb molded body has six first through holes and six opening areas smaller than the first through holes adjacent to each other through the partition wall around the first through holes. A second through hole,
In the sealing step, a longer side of the sealing protrusion of the sealing jig having a plurality of sealing protrusions including a quadrangular pyramid shape having a rhombic bottom surface and a quadrangular pyramid shape is the first side The first through hole is sealed by pressure-bonding the partition walls by inserting the second through hole while vibrating at a frequency of 1 kHz or less so as to contact the partition wall of the through hole. Item 3. A method for manufacturing a honeycomb structured body according to Item 2.   In the sealing step, the sealing protrusions of the sealing jig having a plurality of sealing protrusions including a triangular pyramid shape and a triangular frustum-shaped shape are arranged adjacent to one of the through holes. The method for manufacturing a honeycomb structured body according to claim 2, wherein each of the through holes is inserted while being vibrated at a frequency of 1 kHz or less, thereby pressure-bonding the partition walls to seal the through holes.   In the sealing step, the sealing protrusion of the sealing jig having a plurality of sealing protrusions including a conical shape and a frustoconical shape is surrounded by the six through holes. The method for manufacturing a honeycomb structured body according to any one of claims 2 to 4, wherein each of the holes is inserted while being vibrated at a frequency of 1 kHz or less, thereby pressure-bonding the partition walls to seal the through-hole. .   In the sealing step, the sealing protrusion of the sealing jig having a plurality of sealing protrusions including a hexagonal pyramid shape and a hexagonal truncated pyramid shape is surrounded by six through holes. The honeycomb structure according to any one of claims 2 to 4, wherein each of the through holes is inserted while being vibrated at a frequency of 1 kHz or less, whereby the partition walls are pressed together to seal the through holes. Production method.   In the sealing step, the through-holes are sealed by the sealing jig having the sealing protrusions that are closest to each other at the side portions of the hexagonal pyramid shape and the hexagonal truncated cone shape. A method for manufacturing a honeycomb structured body according to claim 6.   In the sealing step, the through-holes are formed by the sealing jig having the sealing protrusions in which the sealing protrusions are in close contact with each other with the base portions of the hexagonal pyramid shape and the hexagonal truncated cone shape facing each other. The method for manufacturing a honeycomb structured body according to claim 6, wherein   In the sealing step, the partition walls that have been pressure-bonded by sealing the through-holes with the sealing jig including grooves between the valleys of the sealing protrusions of the sealing jig having a plurality of sealing protrusions The method for manufacturing a honeycomb structured body according to any one of claims 1 to 8, wherein the through holes are sealed so as to be parallel to each other over a predetermined length from the end face.   In the sealing step, the sealing jig having a plurality of sealing projections was crimped by sealing the through hole with the sealing jig having a rounded chamfer between each of the sealing projections. The method for manufacturing a honeycomb structured body according to any one of claims 1 to 9, wherein the through holes are sealed so that the partition walls are rounded at the end faces. In the sealing step, immediately after the green honeycomb molded body is extruded from a raw material and cut into a predetermined length, the through holes on both end faces of the green honeycomb molded body are simultaneously sealed,
The through-holes in the end face of at least one of the green honeycomb molded bodies are inserted into a part of the plurality of through-holes by inserting sealing jigs oscillated at a frequency of 1 kHz or less, respectively. The manufacturing method of the honeycomb structure according to any one of claims 1 to 10, wherein A support step of supporting the lower end face of the green honeycomb molded body immediately after being extruded vertically from the raw material with the sealing jig;
In the sealing step, a plurality of the sealing jigs that are vibrated at a frequency of 1 kHz or less in a part of the through hole on the lower end surface of the green honeycomb molded body after being supported in the supporting step. The method for manufacturing a honeycomb structure according to claim 11, wherein the partitioning protrusions are inserted to press the partition walls together to seal the through holes. The sealing jig is capable of selectively changing between a state in which the sealing protrusion is housed inside a support surface and a state in which the sealing protrusion is protruded outside the support surface,
In the supporting step, the lower side of the green honeycomb molded body immediately after being extruded vertically downward from the raw material by the supporting surface of the sealing jig in a state where the sealing protrusion is housed inside the supporting surface. Supporting the end face of
In the sealing step, the sealing protrusion of the sealing jig in a state where the sealing protrusion protrudes outside the support surface is part of the through-hole on the end surface below the green honeycomb molded body. The method for manufacturing a honeycomb structured body according to claim 12, wherein the partition walls are pressure-bonded to each other so as to seal the through-holes by being inserted while being vibrated at a frequency of 1 kHz or less.

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