JP2012148492A - Method for cutting green molded body, method for manufacturing green molded body, and system for manufacturing green molded body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sufficiently suppress the deformation of a green molded body extruded from an extrusion molding apparatus.SOLUTION: A method for cutting a green molded body includes: a process for jetting gas from the lower side toward the green molded body 70A extruded in the horizontal direction from a die 8 which an extrusion molding apparatus 10 has; a process for moving upward a holding member 31 having a recessed part 31a in accordance with a shape of the side face of the green molded body 70A and bringing the recessed part 31a into contact with the side face of the tip of the green molded body 70A; and a process for cutting the green molded body 70A near the holding member 31 and at the position of the die 8 from the upper part to the lower part.

Description

  The present invention relates to a method for cutting a green molded body extruded in a lateral direction from a die included in an extrusion molding apparatus, a method for manufacturing a green molded body, and a green molded body manufacturing system.

  Conventionally, honeycomb filter structures are widely known for DPF (Diesel particulate filter) and the like. This honeycomb filter structure has a structure in which one end side of some through holes of a honeycomb structure having a large number of through holes is sealed with a sealing material, and the other end side of the remaining through holes is sealed with a sealing material. Patent Documents 1 and 2 disclose a die and an extrusion molding apparatus used for manufacturing a green honeycomb molded body. Patent Document 3 discloses a method for cutting a green honeycomb molded body.

JP 61-5915 A Japanese Patent No. 4099896 JP 2001-96524 A

  By the way, when the green molded body is extruded in the lateral direction from the die of the extrusion molding apparatus, the tip is bent downward by gravity as the extruded green molded body becomes longer. When a cutting device in which a cutter such as a wire moves downward from above is used to cut the green molded body to a predetermined length, force is applied downward from the cutter to the green molded body. In order to prevent deformation of the green molded body due to gravity or a wire, it is necessary to support the tip of the green molded body with a holding member made of sponge or the like.

  However, normally, due to structural limitations of the extrusion molding device and the cutting device, these devices cannot be placed sufficiently close to each other, and the green molded body is supported by the holding member from the position of the die of the extrusion molding device. Up to 500-600 mm may be required. In this case, although depending on the strength of the green molded body, it tends to bend downward until the tip of the green molded body reaches the position of the holding member. Further, even when the tip portion is supported by the holding member, the green molded body may bend downward between the die and the holding member.

  When the portion bent below the green molded body moves rearward along with extrusion molding and the holding member comes into contact with the portion, the green molded body is pushed upward by the holding member and the base end portion of the green molded body ( Wrinkles may occur near the die exit. The deformation of the green molded body causes cracks in the process of firing the green molded body to obtain a fired body.

  The present invention has been made in view of the above problems, and a method for cutting a green molded body, a method for producing a green molded body, and a green molded body capable of sufficiently suppressing deformation of a green molded body extruded from an extrusion molding apparatus. An object is to provide a manufacturing system.

  The present invention includes a step of injecting gas from below toward a green molded body extruded in a lateral direction from a die included in an extrusion molding apparatus, and a holding member having a concave portion corresponding to the shape of the side surface of the green molded body upward. A step of moving the concave portion into contact with the side surface of the tip of the green molded body, and a step of cutting the green molded body from above to below in the vicinity of the holding member and on the die side. Provide a cutting method.

  This invention provides the manufacturing method of the green molded object provided with the process which concerns on the said cutting method. That is, the method for producing a green molded body according to the present invention includes a step of supplying a raw material to an extrusion molding apparatus, a step of extruding a green molded body in a lateral direction from a die included in the extrusion molding apparatus, and a green molding extruded from the die. A step of injecting gas from below toward the body, a step of moving a holding member having a recess according to the shape of the side surface of the green molded body upward, and bringing the recess into contact with the side surface of the tip of the green molded body; And a step of cutting the green molded body from above to below in the vicinity of the holding member and on the die side.

  According to the cutting method and the manufacturing method, upward gas can be injected from the gas injection surface toward the green molded body in a state where the tip portion is not supported by the holding member. Thereby, it is possible to sufficiently prevent the green molded body from being bent downward due to gravity until the tip of the green molded body reaches the position of the holding member. Further, by continuing the gas injection while the green molded body is being cut from the upper side to the lower side with the cutter, it is possible to sufficiently prevent the green molded body from being bent by the force applied from the cutter. Suppressing the deflection of the green molded body that is extruded in the horizontal direction and cutting it in the vertical direction and the direction perpendicular to the extrusion direction makes it possible to efficiently produce a green molded body with sufficiently high parallelism at both end faces. Can get to.

  The present invention relates to an extrusion molding apparatus, a support apparatus for supporting a green molded body extruded in the lateral direction from the extrusion molding apparatus, and a cutting apparatus for cutting the green molded body into a predetermined length. Provide a system. The extrusion molding apparatus includes a housing having a flow path for transferring a pasty raw material composition, a screw provided on the upstream side of the flow path, kneading the raw material composition and transferring it downstream, and downstream of the flow path. A green molded body made of the raw material composition is provided on the side, and the die is extruded in the lateral direction; and a resistance tube that communicates the flow path with the die. The support device includes a holding member having a recess corresponding to the shape of the side surface of the green molded body, and a driving unit that moves the holding member upward to bring the concave portion of the holding member into contact with the side surface of the tip of the green molded body. A gas injection surface having a plurality of openings for injecting gas upward and gas supply means for supplying gas to the plurality of openings extends from the position of the die to a position where the driving means is provided. . The cutting device has a cutter that cuts the green molded body from above to below in the vicinity of the holding member and on the die side.

  Since the green molded body production system can inject gas upward from the gas injection surface, the green molded body is moved downward by gravity until the tip of the green molded body reaches the position of the holding member. It is possible to sufficiently prevent bending. Further, by continuing the gas injection while the green molded body is being cut by the cutter, the green molded body can be sufficiently prevented from being bent by the force applied from the cutter. Suppressing the deflection of the green molded body that is extruded in the horizontal direction and cutting it in the vertical direction and the direction perpendicular to the extrusion direction makes it possible to efficiently produce a green molded body with sufficiently high parallelism at both end faces. Can get to.

  According to the present invention, deformation of the green molded body extruded from the extrusion molding apparatus can be sufficiently suppressed.

(A) is a perspective view which shows an example of a green honeycomb molded object, (b) is the elements on larger scale of a green honeycomb molded object. It is a schematic sectional drawing which shows one Embodiment of the green molded object manufacturing system which concerns on this invention. It is a fragmentary sectional view which shows typically the internal structure of an extrusion molding apparatus. It is a perspective view which shows an example of a holding member. It is a perspective view which shows the structure of a gas injection plate typically. It is a perspective view which shows the structure of a cutting device typically.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. First, prior to description of the green molded body manufacturing system according to the present invention, a green molded body for a honeycomb structure will be described.

<Green molded body>
A green honeycomb molded body (green molded body) 70 shown in FIG. 1 is obtained by cutting a green honeycomb molded body 70A extruded by the extrusion molding apparatus 10 into a predetermined length (see FIG. 2). As shown in FIG. 1 (a), the green honeycomb molded body 70 is a cylindrical body in which a large number of through holes 70a are arranged substantially in parallel. The cross-sectional shape of the through hole 70a is a square as shown in FIG. The plurality of through-holes 70a are arranged in a square arrangement in the green honeycomb molded body 70, that is, such that the central axis of the through-hole 70a is located at the apex of the square. The square size of the cross section of the through hole 70a can be set to 0.8 to 2.5 mm on a side, for example. In addition, a honeycomb structure is manufactured by firing the green honeycomb molded body 70 at a predetermined temperature.

  The length of the green honeycomb molded body 70 in the direction in which the through hole 70a extends is not particularly limited, but may be, for example, 40 to 350 mm. Further, the outer diameter of the green honeycomb molded body 70 is not particularly limited, but can be set to 100 to 320 mm, for example. The partition wall thickness, which is the distance between the through holes 70a, can be 0.05 to 0.5 mm.

  The material of the green honeycomb molded body 70 is not particularly limited, but can be green (ceramic raw material) that becomes ceramic by firing later. Examples of ceramics include alumina, silica, mullite, cordierite, glass, oxides such as aluminum titanate, silicon carbide, silicon nitride, and metal. The aluminum titanate can further contain magnesium and / or silicon.

  Specifically, the green honeycomb molded body 70 can include an inorganic compound source powder that is a ceramic raw material, an organic binder such as methylcellulose, and an additive that is added as necessary.

  For example, in the case of a green molded body of aluminum titanate, the inorganic compound source powder includes an aluminum source powder such as α-alumina powder, and a titanium source powder such as anatase-type or rutile-type titania powder. Furthermore, magnesium source powders such as magnesia powder and magnesia spinel powder and / or silicon source powders such as silicon oxide powder and glass frit can be included.

  Examples of the organic binder include celluloses such as methylcellulose, carboxymethylcellulose, hydroxyalkylmethylcellulose, and sodium carboxymethylcellulose; alcohols such as polyvinyl alcohol; and lignin sulfonate. The amount of the organic binder is preferably 20 parts by weight or less, more preferably 15 parts by weight or less, and still more preferably 6 parts by weight or less with respect to 100 parts by weight of the inorganic compound source powder. Moreover, it is preferable that the minimum amount of an organic binder is 0.1 weight part, More preferably, it is 3 weight part.

  Examples of the additive include a pore-forming agent, a lubricant, a plasticizer, a dispersant, and a solvent.

  Examples of the pore-forming agent include carbon materials such as graphite; resins such as polyethylene, polypropylene, and polymethyl methacrylate; plant materials such as starch, nut shells, walnut shells, and corn; ice; and dry ice. The amount of pore-forming agent added is preferably 0 to 40 parts by weight, more preferably 0 to 25 parts by weight with respect to 100 parts by weight of the inorganic compound source powder.

  Examples of the lubricant include alcohols such as glycerin; higher fatty acids such as caprylic acid, lauric acid, palmitic acid, arachidic acid, oleic acid and stearic acid; and stearic acid metal salts such as Al stearate. The addition amount of the lubricant is preferably 0 to 10 parts by weight, more preferably 1 to 5 parts by weight with respect to 100 parts by weight of the inorganic compound source powder.

  As a plasticizer, polyoxyalkylene alkyl ether is mentioned, for example. Examples of commercially available products include “Unilube 50MB-72” manufactured by NOF Corporation (polyoxyethylene polyoxypropylene butyl ether, viscosity at 20 ° C. of 1020 mPa · s), “UNILUBE 50MB-168” manufactured by NOF Corporation (poly Oxyethylene polyoxypropylene butyl ether and a viscosity at 20 ° C. of 2880 mPa · s). The amount of the plasticizer is preferably 0.1 to 20 parts by weight, more preferably 0.1 to 10 parts by weight, and still more preferably 0.1 to 10 parts by weight with respect to 100 parts by weight of the inorganic compound source powder. 1 to 6 parts by weight.

  Examples of the dispersant include inorganic acids such as nitric acid, hydrochloric acid and sulfuric acid; organic acids such as oxalic acid, citric acid, acetic acid, malic acid and lactic acid; alcohols such as methanol, ethanol and propanol; ammonium polycarboxylate Surfactant etc. are mentioned. It is preferable that the addition amount of a dispersing agent is 0-20 weight part with respect to 100 weight part of an inorganic compound source powder, More preferably, it is 2-8 weight part.

  As the solvent, for example, alcohols such as methanol, ethanol, butanol and propanol; glycols such as propylene glycol, polypropylene glycol and ethylene glycol; and water can be used. Of these, water is preferable, and ion-exchanged water is more preferably used from the viewpoint of few impurities. The amount of the solvent used is preferably 10 to 100 parts by weight, more preferably 20 to 80 parts by weight with respect to 100 parts by weight of the inorganic compound source powder.

<Green molded body production system>
An embodiment of a green molded body manufacturing system according to the present invention will be described with reference to FIGS. A green molded body manufacturing system 100 shown in FIG. 2 is for manufacturing a green honeycomb molded body 70 from a powdery or pasty raw material composition. The green molded body manufacturing system 100 includes an extrusion molding apparatus 10, a support device 30 that supports the green honeycomb molded body 70A extruded in the horizontal direction from the extrusion molding apparatus 10, and a green honeycomb molded body 70A cut into a predetermined length. And a cutting device 50 for obtaining a green honeycomb molded body 70.

(Extrusion molding equipment)
As shown in FIG. 2, the extrusion molding apparatus 10 includes a screw 2 </ b> A provided at the upper stage in the housing 1 and a screw 2 </ b> B provided at the lower stage. The screws 2A and 2B are for kneading the raw material composition supplied from the inlet 1a and transferring it downstream through the flow path 1b. A vacuum chamber 3 is provided between the screws 2A and 2B, and the raw material composition can be degassed by reducing the pressure in the vacuum chamber 3. The raw material composition in the vacuum chamber 3 is introduced into the lower screw 2B by a roller 3a.

  As shown in FIG. 3, the extrusion molding apparatus 10 includes a flow rate adjusting plate 5 provided on the downstream side of the screw 2B as necessary, a die 8 from which a green honeycomb molded body 70A made of a raw material composition is extruded, and a flow path 1b. And a resistance tube 9 communicating with the die 8. The resistance tube 9 has a tapered inner flow path, and the flow path cross-sectional area gradually decreases from the upstream side toward the downstream side. Note that, in the case of manufacturing the green honeycomb molded body 70A having a diameter larger than the diameter of the screw 2B, the resistance tube 9 may have an enlarged portion in which the channel cross section increases from upstream to downstream. .

  The flow rate adjusting plate 5 is for making the flow velocity distribution uniform before introducing the raw material composition into the die 8. The flow rate adjusting plate 5 is detachably provided on the housing 1 and is disposed between the screw 2 </ b> B and the die 8. The flow rate adjusting plate 5 is fixed to the housing 1 by tightening the flanges 1c and 1d with bolts and nuts. The flow rate adjusting plate 5 may have a net-like resistor (not shown) in order to enhance the effect of flow rate adjustment.

  The flow rate adjusting plate 5 has a plurality of through holes 5a having a diameter of 1 to 10 mm that penetrate in the thickness direction. The flow rate adjusting plate 5 is preferably a structure that hardly causes distortion even when pressure is received from the upstream side. From this viewpoint, the material of the flow rate adjusting plate 5 is preferably, for example, carbon steel. Examples of suitable materials other than carbon steel include special steels containing nickel, chromium, tungsten and the like. The thickness of the flow rate adjusting plate 5 is preferably 10 to 100 mm from the viewpoint of ensuring sufficient strength.

  The die 8 is for producing a molded body having the shape shown in FIG. 1 from the raw material composition, and has a grid-like flow path (not shown) corresponding thereto. By passing the raw material composition through the die 8, a green honeycomb molded body 70 </ b> A having a large number of through holes 70 a having a square channel cross section and an outer peripheral skin covering the side surface is formed.

(Supporting device)
The support device 30 is disposed at the subsequent stage of the extrusion molding device 10, and prevents the green honeycomb molded body 70 </ b> A extruded from the die 8 in the horizontal direction from being deformed by the gravity and the wire (cutter) W of the cutting device 50. Is for. The support device 30 includes a plurality of holding members 31 having recesses 31a, a movable plate (driving means) 33 that repeats the operation of moving the holding members 31 one by one, and air upward toward the green honeycomb molded body 70A. And a compressor (gas supply means) 37 for supplying compressed air to the gas injection plate 35 (see FIGS. 2, 4 and 5).

  As shown in FIG. 4, the holding member 31 includes a sponge body 31 b and a resin (for example, vinyl chloride) bottom 31 c. A concave portion 31a corresponding to the shape of the side surface of the green honeycomb molded body 70A is formed in the sponge main body portion 31b. In the present embodiment, since the green honeycomb molded body 70A has a cylindrical shape, the recess 31a has a semicircular cross-sectional shape.

  The movable plate 33 is for bringing the concave portion 31a of the holding member 31 into contact with the side surface of the green honeycomb molded body 70A. FIG. 2 shows a state in which the movable plate 33 on which the holding member 31 is placed rises and the concave portion 31a of the holding member 31 comes into contact with the side surface of the green honeycomb molded body 70A. When the tip of the green honeycomb molded body 70A pushed out from the die 8 reaches a predetermined position, the movable plate 33 may be detected by a sensor or the like and automatically raised. It may be one that is manually operated after being visually confirmed. The movable plate 33 is set to stop at a predetermined height after moving upward. That is, the movable plate 33 is set to stop at a height at which the height of the die 8 and the height of the concave portion 31 a of the holding member 31 on the movable plate 33 coincide.

  The upper surface of the gas injection plate 35 forms a gas injection surface 35 a and extends from the position of the die 8 of the extrusion molding apparatus 10 to the position of the movable plate 33. The gas injection plate 35 is disposed below the green honeycomb molded body 70A, and the gas injection surface 35a is separated from the side surface of the green honeycomb molded body 70A by 0.1 to 10 mm. As shown in FIG. 5, the gas injection surface 35a has a plurality of openings 35b, and air can be injected from these openings 35b toward the green honeycomb molded body 70A. The gas injection surface 35a is preferably curved so as to surround the side surface of the green honeycomb molded body 70A, and the cross section perpendicular to the extrusion direction is more preferably semicircular as shown in FIG.

  The diameter of the opening 35b is preferably 0.1 to 10 mm, although it depends on the size and specific gravity of the green honeycomb molded body 70A. The plurality of openings 35b may all have the same diameter, or may be provided such that the diameter gradually increases as the distance from the die 8 in the extrusion direction increases. By making the diameter of the opening 35b at a position away from the die 8 larger than the diameter of the opening 35b at a position close to the die 8, a sufficient upward force is given by air to the tip of the green honeycomb molded body 70A. Therefore, the deflection of the green honeycomb molded body 70A due to gravity and the wire W can be further sufficiently suppressed.

  The compressor 37 is for supplying compressed air to the plurality of openings 35b. In addition, in order to prevent the green honeycomb molded body 70A from being dried by air injection, wet air may be injected from the plurality of openings 35b.

  A slide stage 38 on which the holding member on the movable plate 33 moves smoothly in the pushing direction is disposed at the subsequent stage of the gas injection plate 35 and the movable plate 33. Thus, the holding member can move in the extrusion direction as the green honeycomb molded body 70A is extruded. The slide table 38 may have a configuration in which a plurality of cylindrical rollers are provided in a direction perpendicular to the extrusion direction, and the holding member is slid by rotating the rollers. Alternatively, the configuration may be such that the holding member is slightly lifted and slid by injecting compressed air from there.

  The support device 30 preferably further includes a gas injection amount control means for adjusting the gas injection amount from the gas injection plate 35 in accordance with the magnitude of the force applied from the wire W to the green honeycomb molded body 70A. By continuing the gas injection while adjusting the gas injection amount while the green honeycomb molded body 70A is being cut, it is possible to sufficiently prevent the green honeycomb molded body 70A from being bent at the time of cutting.

(Cutting device)
The cutting device 50 is for cutting the green honeycomb molded body 70A supported by the holding member 31 to obtain the green honeycomb molded body 70 having a predetermined length. As shown in FIG. 6, the cutting device 50 has a wire W as a cutter, and can hold the wire W in a state of being stretched in a horizontal direction and a direction perpendicular to the extrusion direction (X direction). ing. The wire W descends to a position on the die 8 side in the vicinity of the holding member 31 and cuts the green honeycomb molded body 70A from above to below. The distance between the side surface of the holding member 31 on the die 8 side and the cutting position of the wire W is preferably 50 mm or less from the viewpoint of suppressing deformation of the green honeycomb molded bodies 70A and 70. The wire W can move in the extrusion direction (Y direction) in synchronization with the extrusion speed of the green honeycomb molded body 70A simultaneously with the lowering.

  The cutting device 50 includes a frame plate 52 having an inverted U shape. The frame plate 52 has two tip portions 52a and 52b that are spaced apart in the horizontal direction and extend downward. A leading servo motor 53a is provided at the tip 52a, and a receiving servo motor 53b is provided at the tip 52b.

  A feed-side bobbin 54 a is provided on the rotation shaft of the feed-side servo motor 53 a, and a reception-side bobbin 54 b is provided on the rotation shaft of the reception-side servo motor 53 b via a tension sensor 55. And the wire W is stretched over from the sending side bobbin 54a to the receiving side bobbin 54b. Although the material of the wire W is not specifically limited, For example, a steel wire etc. are mentioned. The diameter of the wire W becomes like this. Preferably it is 1000 micrometers or less, More preferably, it is 120-500 micrometers.

  The feed servo motor 53 a, the receiving servo motor 53 b, and the tension sensor 55 are connected to a tension controller 56. Based on the tension acquired from the tension sensor 55, the tension controller 56 controls the rotation of the feed-side bobbin 54a and the receiving-side bobbin 54b so that the tension of the wire W is within a predetermined range, while the wire W is predetermined. The two motors are controlled so as to move in the X direction from the sending bobbin 54a toward the receiving bobbin 54b at a speed of. The tension is not particularly limited, but is preferably 20 N or more, and preferably 40 N or more, for example. Moreover, although there is no upper limit of tension | tensile_strength, it is preferable to set it as 100 N or less, and it is more preferable to set it as 60 N or less. Also, the moving speed of the wire W in the X direction is not particularly limited, but can be 20 to 200 mm / s.

  In the present embodiment, the wire W is held by the frame plate 52, the feeding servo motor 53a, the receiving servo motor 53b, the feeding bobbin 54a, and the receiving bobbin 54b. In the present embodiment, the wire W can be moved in the X direction (arrow A) by the feed-side bobbin 54a, the receive-side bobbin 54b, the feed-side servo motor 53a, and the receive-side servo motor 53b. Furthermore, in this embodiment, the tension of the wire W can be kept constant by the tension sensor 55 and the tension controller 56.

  By moving the support portion 52c provided on the frame plate 52 in the vertical direction (Z-axis direction), the wire W is moved in the B direction (−Z direction) perpendicular to the A direction (X direction) in which the wire extends. Move. The mechanism for moving the wire W in the vertical direction is not particularly limited, and for example, a rack and pinion mechanism or the like can be used. The moving speed in the −Z-axis direction of the support portion 52c at the time of cutting, that is, the wire W is not particularly limited, but may be, for example, 20 to 200 mm / s.

<Method for producing green molded body>
The green molded body manufacturing method according to the present embodiment includes a step of supplying a raw material to the inlet 1a of the extrusion molding apparatus 10, a step of extruding the green honeycomb molded body 70A in a horizontal direction from the die 8 of the extrusion molding apparatus 10, A step of injecting air (or wet air) from the opening 35b of the gas injection plate 35 onto the green honeycomb molded body 70A pushed out from the die 8, and the holding member 31 is moved upward by the movable plate 33 so that the recess 31a is formed. A step of contacting the side surface of the green honeycomb molded body 70A, and a step of cutting the green honeycomb molded body 70A with a wire W from the upper side to the lower side in the vicinity of the holding member 31 and on the die 8 side.

  According to the green molded body manufacturing system 100 according to the above embodiment, air (or wet air) can be sprayed upward from the gas injection plate 35 of the support device 30 toward the green honeycomb molded body 70A. By injecting air toward the green honeycomb molded body 70A from below, the green honeycomb molded body 70A bends downward due to gravity until the tip of the green honeycomb molded body 70A reaches the position of the holding member 31. It can be sufficiently prevented, and the green honeycomb molded body 70A can be sufficiently prevented from being deformed by the wire W during cutting.

  According to the above manufacturing method using the green molded body manufacturing system 100, the deflection of the green honeycomb molded body 70A extruded in the horizontal direction from the die 8 can be sufficiently suppressed, and the green honeycomb molded body 70A can be extruded in the vertical direction. By cutting with a wire W in a direction perpendicular to the direction, a green honeycomb molded body 70 in which the parallelism of both end faces is sufficiently high can be obtained efficiently.

  The preferred embodiment of the present invention has been described in detail above, but the present invention is not limited to the above embodiment. For example, in the above-described embodiment, the case where the green honeycomb molded body 70 having the plurality of through holes 70a is manufactured has been illustrated. However, if the extrusion direction is the lateral direction, the green honeycomb molded body 70 may be deformed by gravity. You may apply this invention to manufacture of the green molded object which does not have a through-hole.

  In the above-described embodiment, the case where the extrusion direction is the horizontal direction has been illustrated. However, the extrusion direction is not necessarily the horizontal direction, and the extrusion direction may be slightly inclined (about ± 5 °) from the horizontal direction.

  The structure of the drive means for moving the holding member 31 upward and the gas supply means for supplying the injection gas to the opening 35b of the gas injection plate 35 are not limited to the above-described embodiment, but take various forms. be able to. Note that the propellant gas is not limited to air or wet air.

  Further, the arrangement of the through holes 70a of the green honeycomb molded body is not particularly limited. For example, a staggered arrangement may be used instead of the square arrangement. The cross-sectional shape of the through-hole 70a is not limited to a square, and is any polygon such as a rectangle, a hexagon, or a triangle (including a regular hexagon, a regular polygon such as a regular triangle), a circle, an ellipse, etc. It doesn't matter in the form. The external shape of the green honeycomb molded body 70 is not limited to a cylindrical body, and may be a square column such as a square or a rectangle.

  DESCRIPTION OF SYMBOLS 8 ... Die, 10 ... Extrusion molding apparatus, 30 ... Supporting device, 31 ... Holding member, 31a ... Recessed part, 33 ... Movable plate (drive means), 35a ... Gas injection surface, 35b ... Opening, 37 ... Compressor (gas supply means) ), 50 ... cutting device, 70 ... green honeycomb molded body, 70A ... green honeycomb molded body, 70a ... through-hole, 100 ... green molded body manufacturing system.

Claims (3)

A step of injecting gas from below toward a green molded body extruded in a lateral direction from a die of an extrusion molding apparatus;
Moving the holding member having a recess according to the shape of the side surface of the green molded body to bring the concave portion into contact with the side surface of the tip of the green molded body; and
Cutting the green molded body from above to below in the vicinity of the holding member and on the die side; and
A method for cutting a green molded body. Supplying raw materials to an extrusion molding device;
A step of extruding a green molded body in a lateral direction from a die of the extrusion molding apparatus;
Injecting gas from below toward the green molded body extruded from the die;
Moving the holding member having a recess according to the shape of the side surface of the green molded body to bring the concave portion into contact with the side surface of the tip of the green molded body; and
Cutting the green molded body from above to below in the vicinity of the holding member and on the die side; and
A method for producing a green molded body. A green molded body manufacturing system comprising: an extrusion molding apparatus; a support apparatus that supports a green molded body that is extruded laterally from the extrusion molding apparatus; and a cutting device that cuts the green molded body into a predetermined length. There,
The extrusion molding apparatus includes a housing having a flow path for transferring a paste-like raw material composition;
A screw provided on the upstream side of the flow path, kneading the raw material composition and transferring it downstream;
A die provided on the downstream side of the flow path, the green molded body made of the raw material composition is extruded in a lateral direction;
A resistance tube communicating the flow path and the die;
Have
The support device includes a holding member having a recess according to the shape of the side surface of the green molded body,
Driving means for moving the holding member upward to bring the concave portion into contact with the side surface of the tip of the green molded body;
A gas injection surface extending from a position of the die to a position where the driving means is provided and having a plurality of openings for injecting gas upward;
Gas supply means for supplying gas to the plurality of openings;
Have
The said cutting device is a green molded object manufacturing system which has the cutter which cuts the said green molded object from the upper direction to the downward direction in the position of the said die | dye side in the vicinity of the said holding member.

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