JP2015193533A - Manufacturing method of ceramic honeycomb structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a ceramic honeycomb structure that suppresses chips at the corner of an outer peripheral wall on the end face of a ceramic honeycomb structure when the ceramic honeycomb structure is transferred to the following drying step after applying a coating material to the outer peripheral face of a long and large ceramic honeycomb structure especially having a large outer diameter of 150 mm or more and a length of 200 mm or more.SOLUTION: After a ceramic honeycomb structure sandwiched between a first and a second holders has its outer peripheral face coated with a coating material and is then arranged so that its axial direction is nearly the vertical direction, it is taken out of the holders. The ceramic honeycomb structure is put on a retrieving plate member having a protrusion and an opening on the face on which the ceramic honeycomb structure is put, and then transferred.

Description

  The present invention relates to a method for manufacturing a ceramic honeycomb structure used for exhaust gas purification of an internal combustion engine such as an automobile. In particular, the present invention relates to a method for forming an outer peripheral wall portion of a ceramic honeycomb structure.

In order to reduce harmful substances contained in exhaust gas discharged from internal combustion engines such as automobiles, ceramic honeycomb structures 1 are used as catalytic converters for exhaust gas purification using ceramic honeycomb structures and filters for collecting particulates. Is used.
As shown in FIG. 1A, the ceramic honeycomb structure 1 includes a large number of flow paths 13 and outer peripheral wall portions 14 formed by partition walls 12 that are orthogonal to each other.

  The ceramic honeycomb structure is a process for producing ceramic clay by mixing and kneading raw materials such as ceramic raw materials (for example, cordierite powder), forming aids, pore formers and water, and extruding the ceramic clay from the honeycomb-shaped die. A step of forming a ceramic honeycomb formed body in which an outer peripheral wall portion and a partition wall are integrally formed, a step of drying and firing the formed body to obtain a fired body, a step of removing the outer peripheral portion of the fired body by processing, It is manufactured by forming the outer peripheral wall portion 14 in a process of applying a coating material to the outer peripheral surface removed by the processing and drying or baking. By such a process, a ceramic honeycomb structure having a predetermined shape and strength and having fine pores in the partition walls can be obtained.

Among the steps described above, the step of applying the coating material to the outer peripheral surface removed by processing is performed by a method as shown in Patent Document 1, for example. FIG. 5 (a) is a diagram in which FIG. 1 (a) described in Patent Document 1 is described with its code corrected. As shown in FIG. 5 (a), both end faces 15a, 15b of the ceramic honeycomb body 10 are sandwiched between support plates 81, 82, and a scraper 83 is brought into contact with the contact portions 81a, 82a of the support plate, thereby supporting the support plate 81. The coating material 89 in which ceramic powder, colloidal oxide, binder and water are kneaded is applied to the gap formed by the outer peripheral surface of the ceramic honeycomb body 10, the support plate, and the scraper while rotating 82. .
Then, the ceramic honeycomb body 10 to which the coating material is applied is taken out from the support plates 81 and 82 and conveyed to a process of drying or firing the coating material.

  As a method for taking out the ceramic honeycomb body 10 coated with the coating material from the support plate, Patent Document 2 describes the following. FIG. 6 is a diagram in which FIG. 6 described in Patent Document 2 is described with its code corrected. As shown in FIG. 6, in Patent Document 2, after a coating material is applied to the outer peripheral surface of the ceramic honeycomb body 10, a pedestal 93 on which the ceramic honeycomb body 10 is placed is lowered to be provided at the center of the pedestal. The ceramic honeycomb body 10 whose outer peripheral surface is coated with a coating material is lifted by the pushed-up plate 94, the end face of the ceramic honeycomb body 10 is lifted, and a plate-shaped transfer pallet 95 having a notch below the end face Is moved, the push-up plate 94 is lowered, and the ceramic honeycomb body 10 is placed on the transfer pallet 95 and transferred to the dryer stand in the next step.

WO2008 / 117729 JP 2004-141709 A

  However, when the coating material is applied to the ceramic honeycomb body, the method described in Patent Document 2 is applied, placed on the transfer pallet, and transferred to the dryer stand in the next step, the following problems are encountered. It was. Since the coating material formed on the peripheral portion of the ceramic honeycomb body is not sufficiently dried, the end surface of the coating material adheres to the transfer pallet, and the ceramic honeycomb body is removed from the transfer pallet. Chipping tends to occur at the corners of the outer peripheral walls of the end faces 15a and 15b of the honeycomb body. In particular, in the case of a large-sized large ceramic honeycomb body having an outer diameter of 150 mm or more and a length of 200 mm or more, since the area where the coating material contacts the transfer pallet is large, the end face of the ceramic honeycomb body The coating material formed on the peripheral edge is likely to adhere to the transfer pallet, and after the ceramic honeycomb body is taken out of the transfer pallet and dried, the corner of the outer peripheral wall of the end face of the ceramic honeycomb body is more likely to be chipped. Had. When chipping occurs at the corners of the outer peripheral wall of the end face of the ceramic honeycomb body, the number of steps for repairing the chipped part increases, or depending on the degree of chipping, it is necessary to dispose of it as a defective product. It was.

  Therefore, the present invention particularly applies the coating material to the outer peripheral surface of a large-sized and long large ceramic honeycomb body having an outer diameter of 150 mm or more and a length of 200 mm or more. It is an object of the present invention to provide a method for manufacturing a ceramic honeycomb structure in which chipping is unlikely to occur at the corners of the outer peripheral wall of the end face of the ceramic honeycomb body when moving to the drying step.

  As a result of repeated investigations on the problems of the prior art described above, the present inventor has improved the method for taking out the ceramic honeycomb body in which the outer peripheral surface is coated with a coating material, so that the outer peripheral wall corner of the end face of the ceramic honeycomb body has been improved. The inventors have found that chipping is less likely to occur and have arrived at the present invention.

Specifically, in the present invention, after applying a coating material to the outer peripheral surface of the ceramic honeycomb body sandwiched between the first and second holding members, the axial direction of the ceramic honeycomb body is arranged so as to be a substantially vertical direction. In the method for manufacturing a ceramic honeycomb structure, the ceramic honeycomb body is taken out from the holding member, and the applied coating material is dried or fired.
The first holding member includes an outer peripheral holding member and a central holding member,
Removal of the ceramic honeycomb body from the holding member,
(a) disposing the first holding member on the lower end surface side of the ceramic honeycomb body;
(b) Raising the central holding member in the vertical direction, or lowering the outer circumferential holding member in the vertical direction to form a gap between the lower end surface of the ceramic honeycomb body and the outer circumferential holding member,
(c) inserting a plate-like take-out member having an opening larger than the outer diameter of the central holding member in the gap and having a convex portion having a size smaller than the outer diameter of the ceramic honeycomb body on the upper surface;
(d) Lowering the central holding member in the vertical direction, or raising the extraction member in the vertical direction, placing the lower end surface of the ceramic honeycomb body on the upper surface of the extraction member,
(e) The ceramic honeycomb body placed on the take-out member is placed on a transfer table.

  In this invention, it is preferable that the convex part surface of the said extraction member is arrange | positioned in the position which touches only the lower end surface of the said ceramic honeycomb body.

  In this invention, it is preferable that the convex part of the said extraction member is formed with the elastic member.

  In the present invention, the inner dimension L of the opening of the extraction member is preferably 1.05DI ≦ L ≦ 0.95DC with respect to the diameter DI of the central holding member and the outer diameter DC of the ceramic honeycomb body.

  In the present invention, the central holding member is joined to the plate-like holding portion and the holding portion so that the outer peripheral holding member and the central holding member are relatively movable in the axial direction of the ceramic honeycomb body. It is preferable to comprise a plurality of bar-shaped push-up portions.

  In the present invention, the center holding member preferably has three or more push-up parts.

  In the present invention, the holding portion of the central holding member is disk-shaped, and the ratio of the outer diameter DI of the holding portion and the outer diameter DC of the ceramic honeycomb body is preferably 0.3 ≦ DI / DC ≦ 0.9. .

  In the present invention, it is preferable that the push-up portion is disposed concentrically with the center of the holding portion.

  According to the present invention, in particular, after the coating material is applied to the outer peripheral surface of a large-sized and long large ceramic honeycomb body having an outer diameter of 150 mm or more and a length of 200 mm or more, the ceramic honeycomb body is subjected to the next step. Thus, it is possible to provide a method for manufacturing a ceramic honeycomb structure in which chipping is unlikely to occur at the corners of the outer peripheral wall of the end face of the ceramic honeycomb body. For this reason, it is not necessary to repair the chip | tip of the outer peripheral wall corner | angular part of the end surface of a ceramic honeycomb body, and it has the effect that it becomes unnecessary to discard as a defective article.

1 is a perspective view showing a ceramic honeycomb structure according to the present invention. It is the schematic diagram which showed taking-out of the ceramic honeycomb body from the holding member based on this invention. It is the schematic diagram which showed the 1st holding member which concerns on this invention. It is the schematic diagram which showed the extraction member which concerns on this invention. It is the figure which described FIG.1 (a) (c) of patent document 1 with the code | symbol corrected. FIG. 6 is a diagram in which FIG.

  Embodiments of the present invention will be specifically described below, but the present invention is not limited to the following embodiments and is based on the ordinary knowledge of those skilled in the art without departing from the spirit of the present invention. Therefore, it should be understood that design changes and improvements can be made as appropriate.

  Embodiments of the present invention will be described with reference to FIG. 2, FIG. 3, and FIG. As shown in FIG. 2 (a), the end surfaces 15a and 15b of the ceramic honeycomb body 10 are sandwiched between the first holding member 21 and the second holding member 22, and the axial direction of the sandwiched ceramic honeycomb body 10 is substantially vertical. The coating material is applied to the outer peripheral surface by the applying member 40 while rotating in the direction. In FIG. 2 (a), the coating material is applied to the outer peripheral surface by the application member 40 while rotating so that the axial direction of the ceramic honeycomb body 10 is a substantially vertical direction. It is also possible to apply the coating material to the outer peripheral surface with the application member 40 while rotating the direction as a substantially horizontal direction [FIG. 2 (f)].

  Next, FIG. 3 (a) is a schematic top view of the first holding member 21, and FIG. 3 (b) is a schematic cross-sectional view taken along line AA in FIG. 3 (a). The first holding member 21 includes a disc-shaped outer peripheral holding member 21-1 and a central holding member 21-2. The central holding member 21-2 is a plate-like holding portion 21 so that the outer peripheral holding member 21-1 and the central holding member 21-2 are relatively movable in the axial direction X of the ceramic honeycomb body 10. -2a and a plurality of rod-like push-up parts 21-2b joined to the holding part 21-2a.

  After the coating of the coating material is completed, the second holding member 22 disposed on the upper end surface of the ceramic honeycomb body 10 is removed [FIG. 2 (b)].

  Then, a vertical upward force is applied to the plurality of rod-shaped push-up parts 21-2b to raise the central holding member 21-2 in the vertical direction, and the lower end surface 15a of the ceramic honeycomb body 10 and the outer peripheral holding member 21-1 A gap G is formed between the upper surface and the upper surface [FIG. 2 (c)]. The outer periphery holding member 21-1 may be lowered in the vertical direction to form a gap G between the lower end surface 15a of the ceramic honeycomb body 10 and the upper surface of the outer periphery holding member 21-1.

  Next, a plate-like extraction member 30 having an opening larger than the outer diameter of the central holding member and a projection 35 having a size smaller than the outer diameter of the ceramic honeycomb body is inserted into the gap G. [Figure 2 (d)]. FIG. 4 (a) is a schematic top view of the extraction member 30, and FIG. 4 (c) is a schematic side view of FIG. 4 (a).

Here, the opening 31 of the extraction member 30 has a shape in which the extraction member 30 can place the lower end surface 15a of the ceramic honeycomb body 10, for example, as shown in FIGS. In addition, a part 31 of the take-out member 30 has a U-shaped shape 31 so that it can be inserted into the gap between the lower end surface 15a of the ceramic honeycomb body 10 and the outer periphery holding member 21-1. Say.
Further, as shown in FIGS. 4 (a) and 4 (b), the convex portion 35 formed on the take-out member has an outer shape smaller than the outer diameter of the ceramic honeycomb body 10, and the opening portion. The inner shape is substantially the same as the opening shape.
In the case of FIG. 4 (a), three protrusions 35 having the same height are formed, and in the case of FIG. 4 (b), one having a uniform height is formed along the opening shape. Has been.

  After inserting the take-out member 30 into the gap G, the central holding member 21-2 is lowered in the vertical direction, and the lower end surface 15 a of the ceramic honeycomb body 10 is protruded with a dimension smaller than the outer diameter of the ceramic honeycomb body of the take-out member 30. Placed on the part 35 [FIG. 2 (e)]. As a method of placing the lower end surface 15a of the ceramic honeycomb body 10 on the extraction member 30, the extraction member 30 may be raised in the vertical direction.

Next, the extraction member 30 is moved to the upper part of the conveyance table 60, the extraction member 30 is lowered, and the ceramic honeycomb body 10 placed on the convex portion 35 of the extraction member 30 is placed on the conveyance table 60 [FIG. (g)], after further lowering the extraction member 30, the extraction member 30 is moved to the side [FIG. 2 (h)]. Then, the coating material applied to the outer peripheral surface of the ceramic honeycomb body is dried or fired to obtain a ceramic honeycomb structure having the outer peripheral wall portion.
Here, in the transport table 60, the surface 61 on which the end face of the ceramic honeycomb body is placed is formed smaller than the outer diameter of the ceramic honeycomb body.

  By adopting such a manufacturing method, the coating material end portion that is not sufficiently dried formed on the peripheral edge portion of the end surface 15a of the ceramic honeycomb body is not in direct contact with the extraction member 30, so that the end surface 15a of the ceramic honeycomb body, Chipping is less likely to occur at the corners of the outer peripheral wall of 15b.

  The protruding portion 35 of the take-out member 30 reliably prevents the end portion of the coating material from coming into direct contact with the take-out member when its height H protrudes 1.5 mm or more from the surface 30a of the take-out member 30. This is preferable because it is possible. 2.0 mm or more is more preferable, and 2.5 mm or more is more preferable. On the other hand, when the height H of the convex portion is too high, it is necessary to make a large gap G between the end surface 15a of the ceramic honeycomb body 10 and the upper surface of the outer peripheral holding member 21-1. May increase. Therefore, the height H of the convex portion is preferably 10 mm or less. More preferably, it is 8 mm or less.

  Further, the convex portion 35 of the extraction member 30 is formed with a size smaller than the outer diameter of the ceramic honeycomb body, but the dimension of the interval S between the side surface portion 351 of the convex portion and the outer diameter portion of the ceramic honeycomb body is: It is preferably 1.0% or more of the ceramic honeycomb body outer diameter DC. Preferably, it is 1.2% or more, more preferably 1.4% or more.

  The surface of the convex portion 35 of the extraction member 30 is preferably disposed at a position in contact with only the lower end surface 15a of the ceramic honeycomb body 10. Thereby, when the ceramic honeycomb body is placed on the extraction member 30, the coating material near the end face 15a of the ceramic honeycomb body becomes difficult to contact the extraction member 30, and the end face 15a of the ceramic honeycomb body after the coating material is dried, Chipping is less likely to occur at the corners of the outer peripheral wall of 15b.

Further, the material of the convex portion 35 of the take-out member 30 is preferably an elastic member that is softer than the take-out member because the end face of the ceramic honeycomb body is less likely to be damaged when contacting the lower end face of the ceramic honeycomb body. For example, rubber, urethane, urethane rubber, sponge, or the like can be used as the elastic member, and urethane rubber is particularly preferable.
On the other hand, the plate-like extraction member 30 only needs to have a strength that allows the ceramic honeycomb body 10 to be placed and moved, and can be made of stainless steel. The thickness of the plate-like extraction member 30 is 3 to 15 mm is preferred.

  The inner dimension L of the opening 31 is preferably 1.05DI ≦ L ≦ 0.95DC with respect to the outer diameter DI of the holding portion 21-2a and the outer diameter DC of the ceramic honeycomb body 10. Thereby, the extraction member 30 can be easily inserted into the gap, and the lower end surface 15a of the ceramic honeycomb body 10 can be stably placed on the extraction member 30. Preferably, 1.1DI ≦ L ≦ 0.9DC.

  Further, when the extraction member 30 is inserted into the gap G, the shortest distance T between the surface of the convex portion formed on the extraction member 30 and the lower end surface 15a of the ceramic honeycomb body 10 is set to 0.8 to 10 of the outer diameter DC of the ceramic honeycomb body. It is preferable to insert the extraction member in the range of%. When the extraction part is inserted in a range of less than 0.8%, the tip of the extraction member may come into contact with the end face of the ceramic honeycomb body due to vibration during the operation of inserting the extraction member, and the end face of the ceramic honeycomb body is damaged. It becomes easy to do. On the other hand, when the takeout part is inserted beyond the range of 10%, when the holding member on which the ceramic honeycomb body is placed is lowered, it takes time to place the ceramic honeycomb body on the takeout member, so that the production efficiency decreases. . Preferably, it is 0.9 to 7% of range, More preferably, it is 1 to 5% of range.

  In the method for manufacturing a ceramic honeycomb structure according to the present invention, in order to raise the central holding member in the vertical direction, a vertically upward force is applied to the plurality of rod-shaped push-up portions 21-2b fixed to the central holding member 21-2a. In addition, the center holding member 21-2 is pushed up vertically.

  Here, when the central holding member 21-2 is pushed upward vertically, the central holding member has a plurality of rod-like push-up portions 21-2 b at three or more locations so that the ceramic honeycomb body can be easily stabilized. It is preferable. The number is preferably 4 or more, more preferably 6 or more.

  Further, the holding portion 21-2a of the central holding member 21-2 is plate-shaped, and the ratio of the outer diameter DI of the holding portion and the outer diameter DC of the ceramic honeycomb body is 0.3 ≦ DI / DC ≦ 0.9, This is preferable because the ceramic honeycomb body becomes more stable when the center holding member 21-2 is pushed upward vertically. Preferably, 0.4 ≦ DI / DC ≦ 0.8. Here, if the ceramic honeycomb body is stable when the center holding member 21-2 is pushed upward vertically, the shape of the holding portion 21-2a is the upper surface of the holding portion as shown in FIG. The entire surface may be in contact with the ceramic honeycomb body, or a part of the upper surface of the holding portion as shown in FIGS. 3C and 3D may be in contact with the ceramic honeycomb body.

  In addition, the push-up portion 21-2b is arranged concentrically with the center of the holding portion 21-2a, so that the ceramic honeycomb body is more stable when the center holding member 21-2 is pushed up vertically. This is preferable.

  In the present invention, the step of applying the coating material to the outer peripheral surface of the ceramic honeycomb body includes drying and firing the ceramic honeycomb formed body in which the outer peripheral wall portion and the partition wall are integrally formed to obtain a fired body. The coating material may be applied to the outer peripheral surface from which the outer peripheral portion has been removed by processing, or may be applied to the outer peripheral surface of the ceramic honeycomb formed body before firing.

  Further, according to the method for manufacturing a ceramic honeycomb structure of the present invention, as shown in FIG. 5 (b), a coating material is applied to the outer peripheral surface of the ceramic honeycomb body sandwiched between the support plates 81 and 82 having the cut portions P. When the ceramic honeycomb body in which the peripheral wall portion 18 having a predetermined height b1, b2 and width d is formed on the peripheral edge portions of the end faces 15a, 15b of the ceramic honeycomb body is placed on the take-out member, Since the coating material protrudes from the end face of the ceramic honeycomb body, the effect of the present invention is great and can be suitably used.

(Examples 1-3)
A cordierite-forming raw material powder containing 50% by mass of SiO ₂ , 35% by mass of Al ₂ O ₃ , and 13% by mass of MgO is prepared by preparing kaolin, talc, silica and alumina powders, and methylcellulose and hydroxy as binders Graphite was added as a propylmethylcellulose, a lubricant, and a pore former, and after thoroughly mixing in a dry process, water was added and sufficient kneading was performed to produce a plasticized ceramic clay. This ceramic kneaded material was extruded and cut to a predetermined length to obtain a formed body having a honeycomb structure in which a peripheral edge portion and partition walls were integrally formed. The peripheral edge portion 11a of this molded body is removed by processing to form an outer peripheral surface, dried and fired. In Examples 1 and 2, the outer diameter is 266 mm, the overall length is 300 mm, the partition wall thickness is 0.3 mm, the cell pitch is 1.5 mm, and the example In No. 3, a cordierite ceramic honeycomb body 10 having an outer diameter of 228 mm, a total length of 254 mm, a partition wall thickness of 0.3 mm, and a cell pitch of 1.5 mm was obtained.

Next, as shown in FIG. 2 (a), the end faces 15a and 15b of the ceramic honeycomb body 10 are sandwiched between the first holding member 21 and the second holding member 22, and the axial direction of the sandwiched ceramic honeycomb body 10 The coating material is applied to the outer peripheral surface by the application member 40 while rotating so that the is substantially vertical.
In Examples 1 and 2, the first holding member 21 and the second holding member 22 are 3 mm larger in diameter than the outer diameter DC of the ceramic honeycomb body so that the thickness of the coating material is 1.5 mm. Was 269 mm, and in Example 3, the outer diameter was 231 mm. The coating material was prepared by using cordierite powder, colloidal silica, 2% methylcellulose and 49% ion-exchanged water as binders.
At this time, the central holding member 21-2 of the first holding member 21 was configured as shown in Table 1 with respect to the structure of the holding portion 21-2a and the push-up portion 21-2b.
Next, after the coating of the coating material is completed, the second holding member 22 arranged on the upper surface of the ceramic honeycomb body 10 is removed (FIG. 2 (b)). Using the first holding member 21 having a plurality of rod-like push-up portions 21-2b arranged concentrically with the center of the holding portion shown in FIG. 3, the push-up assisting member 25 is attached to the plurality of rod-like push-up portions 21-2b. The central holding member 21-2 is pushed upward vertically by applying a force vertically upward, and a gap of 15 mm is formed between the lower end surface 15 a of the ceramic honeycomb body 10 and the outer peripheral holding member 21-1 ( 2 (c)), the takeout member 30 is inserted into the gap (FIG. 2 (d)). As shown in FIG. 4 (a), the take-out member 30 protrudes from the surface 30a of the plate-like take-out member 30 (thickness 4 mm) made of stainless steel, and three convex portions 35 made of urethane rubber have the same height. One is formed. At this time, the relationship between the height of the convex portion 35 and the shortest distance T between the convex portion surface formed on the extraction member 30 and the lower end surface 15a of the ceramic honeycomb body 10 and the outer diameter DC of the ceramic honeycomb body is shown. 1 was performed.
Then, the central holding member 21-2 is lowered vertically and the lower end surface 15a of the ceramic honeycomb body 10 is placed on the convex portion of the takeout member 30 (FIG. 2 (e)), and the ceramic placed on the takeout member 30 is placed. The honeycomb body 10 is placed on the transport table (FIGS. 2 (g) (h)).
Next, the ceramic honeycomb body 10 was placed in a hot air oven at 150 ° C. together with a carrier and dried for 20 minutes, and 30 ceramic honeycomb structures of Example 1 were manufactured under the same conditions.

With respect to the obtained ceramic honeycomb structure of Example 1, the state of breakage of the corners of the end face of the ceramic honeycomb body was visually observed, and among the 30 samples manufactured in each Example, the following criteria were used. evaluated.
The case where there is no damage at the corner is “excellent (◎)”,
The case where one corner is damaged is “good (○)”,
When two corners are damaged, “Yes (△)”,
"No (x)" when there are 3 or more corners that are damaged
And are shown in Table 1.

(Comparative Example 1)
Similarly to Example 1, a ceramic honeycomb body having an outer diameter of 266 mm, an overall length of 300 mm, a partition wall thickness of 0.3 mm, and a cell pitch of 1.5 mm was obtained. Then, as shown in FIG. 2 (a), the end faces 15a and 15b of the ceramic honeycomb body 10 are sandwiched between the first holding member 21 and the second holding member 22, and the axial direction of the sandwiched ceramic honeycomb body 10 is The coating material is applied to the outer peripheral surface by the application member 40 while being rotated so as to be in a substantially vertical direction. The first holding member 21 and the second holding member 22 were configured to have an outer diameter of 269 mm so as to be 3 mm larger in diameter than the outer diameter DC of the ceramic honeycomb body so that the thickness of the coating material was 1.5 mm. The coating material was prepared and used in the same manner as in Example 1.
The central holding member 21-2 of the first holding member 21 was configured as shown in Table 1 with respect to the structure of the holding portion 21-2a and the push-up portion 21-2b.
Next, after the coating of the coating material is completed, a vertical upward force is applied to the push-up portion 21-2b arranged concentrically with the center of the holding portion as shown in FIG. The gap is formed between the lower end surface 15a of the ceramic honeycomb body 10 and the outer periphery holding member 21-1, and the takeout member 30 is inserted into the gap. At this time, the relationship between the shortest distance T between the take-out member 30 and the lower end surface 15a of the ceramic honeycomb body 10 and the outer diameter DC of the ceramic honeycomb body was performed as shown in Table 1.
Then, the central holding member 21-2 is lowered vertically and the lower end surface 15a of the ceramic honeycomb body 10 is placed on the take-out member 30, and the ceramic honeycomb body 10 placed on the take-out member 30 is placed on the transport table. .
Next, it was placed in a hot air oven at 150 ° C. and dried for 20 minutes, and 30 ceramic honeycomb structures of Comparative Example 1 were manufactured under the same conditions.
The ceramic honeycomb structure of Comparative Example 1 was evaluated in the same manner as Example 1, and is shown in Table 1.

  From the evaluation results in the table, Examples 1 to 3 of the present invention, after applying the coating material to the outer peripheral surface of the ceramic honeycomb body, place the ceramic honeycomb body on the transfer pallet, and move to the dryer stand of the next step, It can be seen that chipping hardly occurs at the corners of the end face of the ceramic honeycomb body after drying. On the other hand, in the comparative example 1, it turns out that a chip | corner tends to produce in the corner | angular part of the end surface of a ceramic honeycomb body.

1: Ceramic honeycomb structure 10: Ceramic honeycomb body 12: Partition wall 13: Channel 14: Outer peripheral wall 15a, 15b: End face 16: Boundary 17: Gap 18: Perimeter wall 21: First holding member 22: Second Holding member 21-1: outer periphery holding member 21-2: center holding member 21-2a: plate-like holding portion 21-2b: rod-shaped push-up portion 30: takeout member 30a: surface 31 of the takeout member: opening 35: Convex part 351: Side part 40 of convex part: Application member 60: Conveyance table 81, 82: Support plate 81a, 82b: Contact part 83 of support plate: Scraper 89: Coating material 93: Base (holding member)
94: Push-up plate (central holding member)
95: Transfer pallet (removal member)
G: Gap H: Height of convex portion L: Inner shape dimension S of opening S: Distance between side surface portion of convex portion and outer diameter portion of ceramic honeycomb body T: Shortest distance between take-out member and lower end surface of ceramic honeycomb body interval

Claims (8)

After coating a coating material on the outer peripheral surface of the ceramic honeycomb body sandwiched between the first and second holding members, the ceramic honeycomb body is disposed so that the axial direction of the ceramic honeycomb body is substantially vertical, and the ceramic member is separated from the ceramic. In the method for manufacturing a ceramic honeycomb structure, the honeycomb body is taken out, and the applied coating material is dried or fired.
The first holding member includes an outer peripheral holding member and a central holding member,
Removal of the ceramic honeycomb body from the holding member,
(a) disposing the first holding member on the lower end surface side of the ceramic honeycomb body;
(b) Raising the central holding member in the vertical direction, or lowering the outer circumferential holding member in the vertical direction to form a gap between the lower end surface of the ceramic honeycomb body and the outer circumferential holding member,
(c) inserting a plate-like take-out member having an opening larger than the outer diameter of the central holding member in the gap and having a convex portion having a size smaller than the outer diameter of the ceramic honeycomb body on the upper surface;
(d) Lowering the central holding member in the vertical direction, or raising the extraction member in the vertical direction, placing the lower end surface of the ceramic honeycomb body on the upper surface of the extraction member,
(e) A method for manufacturing a ceramic honeycomb structure, wherein the ceramic honeycomb body placed on the take-out member is placed on a carrier. 2. The method for manufacturing a ceramic honeycomb structure according to claim 1, wherein the surface of the protruding portion of the extraction member is disposed at a position in contact with only a lower end surface of the ceramic honeycomb body. The method for manufacturing a ceramic honeycomb structure according to claim 1 or 2, wherein the convex portion of the extraction member is formed of an elastic member. The inner dimension L of the opening of the extraction member is 1.05DI ≦ L ≦ 0.95DC with respect to the diameter DI of the central holding member and the outer diameter DC of the ceramic honeycomb body. The method for manufacturing a ceramic honeycomb structure according to claim 3. The central holding member includes a plate-like holding portion and a plurality of holding portions joined to the holding portion so that the outer peripheral holding member and the central holding member are relatively movable in the axial direction of the ceramic honeycomb body. The method for manufacturing a ceramic honeycomb structure according to any one of claims 1 to 4, further comprising a rod-shaped push-up unit. The method for manufacturing a ceramic honeycomb structure according to any one of claims 1 to 5, wherein the central holding member has three or more push-up portions. The holding portion of the central holding member is disk-shaped, and the ratio of the outer diameter DI of the holding portion and the outer diameter DC of the ceramic honeycomb body is 0.3 ≦ DI / DC ≦ 0.9. A method for manufacturing a ceramic honeycomb structure according to any one of claims 1 to 6. The method for manufacturing a ceramic honeycomb structure according to any one of claims 1 to 7, wherein the push-up portion is disposed concentrically with a center of the holding portion.

Images