JP2007144922A - Manufacturing method of ceramic honeycomb structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a ceramic honeycomb structure capable of preventing a partition from chipping in processing the end face of the ceramic honeycomb structure with a cup-type abrasive wheel. <P>SOLUTION: The manufacturing method of a ceramic honeycomb structure comprises the step of processing the end face of the ceramic honeycomb structure having a large number of cells formed by porous partitions by using the cup-type abrasive wheel. The cup-type abrasive wheel has a step on the outer peripheral side end face to the inner peripheral side end face at the axial direction attaching part side of the cup-type abrasive wheel, that the cup-type abrasive wheel has an abrasive particle layer at a grinding part thereof, and that the abrasive particle layer is composed of abrasive particle layers having different particle size each other with regard to the outer peripheral side and the inner peripheral side, that is, an abrasive particle layer having a relatively larger particle size is formed at the outer peripheral side and an abrasive particle layer having a relatively smaller particle size is formed at the outer peripheral side. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a manufacturing method for processing an end face of a ceramic honeycomb structure.

  Exhaust gas from diesel engines and the like contains a large amount of PM (particulate matter) mainly composed of carbon, and if this is released into the atmosphere, it will adversely affect the human body and the environment. For this reason, exhaust system parts, such as a diesel engine, are equipped with a filter for collecting PM. FIG. 4 shows an example of a honeycomb structure used for a filter for collecting and purifying PM in automobile exhaust gas, (a) is a schematic front view, and (b) is a schematic side sectional view. is there. 4 (a) and 4 (b), the honeycomb structure 20 is made of porous ceramic and includes an outer peripheral wall 21 and a plurality of cells 23 and 24 partitioned by partition walls 22 orthogonal to the inner side of the outer peripheral wall 21, respectively. The cells 23 and 24 are alternately sealed by the sealing portions 25 and 26 at the exhaust gas inflow side end surface 27 and the outflow side end surface 28. The outer peripheral wall 21 is gripped so as not to move during use by a gripping member (not shown) formed of a metal mesh or a ceramic mat, and is disposed in a metal storage container (not shown). ing.

  The ceramic honeycomb structure used for such a filter is made by mixing and kneading ceramic raw materials into a clay material, and after extruding the clay material, for example, cutting with an ultrafine steel wire described in Patent Document 1, Obtained by drying and firing. A film or mask is attached to the end face of the ceramic honeycomb structure obtained by firing, the film or mask of the cell forming the sealing portion is opened, and the plugged slurry is filled in the opened cell. Thus, a sealing portion is formed, and a ceramic honeycomb filter is obtained. This ceramic honeycomb structure has recently been used with a high porosity in order to achieve PM collection performance and low pressure loss.

  By the way, since the ceramic honeycomb structure obtained by cutting with the ultra fine steel wire described in Patent Document 1 may have deformation or chipping of the partition wall at the end face at the time of cutting, the end face is ground, It is necessary to make it as long as possible. If the cell is deformed at the end face or the partition wall is chipped, a gap is formed between the end face of the ceramic honeycomb structure and the film or mask attached to the end face in the step of forming the sealing portion. Arise. When the plugging slurry is filled, the plugging slurry leaks from the gap to the adjacent cells where the sealing portion should not be originally formed. As a result, the cells that should not originally form the sealing portion are blocked, and therefore, when used as a filter, the problem of increased pressure loss arises.

  Therefore, in order to avoid this, in the Japanese Patent Application No. 2005-101978, the present inventor uses a cup-shaped grindstone to perform grinding so that the end face of the cup-shaped grindstone is substantially parallel to the end face of the ceramic honeycomb structure. A method for manufacturing a ceramic honeycomb structure is proposed. Thereby, the time required for processing can be shortened, and the partition wall can be made less likely to be chipped. And as shown to Fig.5 (a) (b), the angle (theta) which the outer peripheral surface of a cup-shaped grindstone and the end surface of a ceramic honeycomb structure make may be 90 degrees or more, and may be less than 90 degrees, By setting it to less than 90 °, it is said that the partition wall can be processed with less difficulty in chipping.

  In addition, Patent Document 2 relates to a cup-shaped grindstone used when grinding a flat surface portion. A cup-shaped grindstone is disclosed in which the height of the grindstone surface is gradually increased from the outer side to the inner side in the circumferential direction.

Japanese Patent Publication No. 4-60402 Japanese Patent Laid-Open No. 5-92371

However, the manufacturing method proposed by the present inventor in Japanese Patent Application No. 2005-101978 cannot sufficiently prevent the following problems.
That is, as shown in FIG. 5A, a ceramic honeycomb structure using a cup-shaped grindstone having an angle θ between the outer peripheral surface of the cup-shaped grindstone and the end face of the ceramic honeycomb structure of 90 ° or more and less than 90 °. When machining the end face, the partition wall and outer peripheral wall of the unground part are chipped and scattered immediately before the end of processing, and it is not possible to sufficiently prevent the chipping generated on the outer periphery near the processing end position. The chip after clogging is easily clogged in the cell, and the processing force is excessively applied to the partition wall of the cell clog, and the minute chipping (chipping) generated in the partition wall cannot be prevented sufficiently. It was. In addition, it is described that processing is performed using two types of abrasive grains on the end face side and the outer peripheral side of the cup grindstone, but among the two types of abrasive grains, the abrasive grain layer having a relatively large particle diameter is the outer peripheral side. In addition, since the abrasive grain layer having a relatively small particle diameter is formed on the end face side of the cup grindstone, the abrasive grain having a small grain diameter is processed after the abrasive grain layer having a large particle diameter has processed the end face of the honeycomb structure. The machining margin to be processed by the layer is inevitably small, and the chip generated when the abrasive grain layer having a large particle diameter processes the end face of the honeycomb structure cannot be sufficiently removed.

  Thus, in order to improve the above-described problems, the end face of the ceramic honeycomb structure was ground using a cup-shaped grindstone as disclosed in Patent Document 2, but the ceramic honeycomb structure is porous. Therefore, the generation of minute chips could not be sufficiently prevented. And when a chip | tip generate | occur | produced, it was necessary to process again using the grindstone for finishing with a fine abrasive grain, and processing required much time.

  An object of the present invention is to obtain a method for manufacturing a ceramic honeycomb structure capable of preventing chipping generated in partition walls when the end face of the ceramic honeycomb structure is processed using a cup-shaped grindstone.

  In order to solve the above-described problems, the present invention specifically relates to a method for manufacturing a ceramic honeycomb structure in which an end face of a ceramic honeycomb structure having a large number of cells formed by porous partition walls is processed using a cup-shaped grindstone. The cup-shaped grindstone has a step on the outer peripheral side of the cup-shaped grindstone with respect to the inner circumferential side end surface on the axial mounting portion side of the cup-shaped grindstone. The abrasive layer is an abrasive layer of abrasive grains having different particle sizes on the outer peripheral side and the inner peripheral side of the cup-shaped grindstone, and the abrasive grains having a relatively large particle size among the abrasive grains. The grain layer is formed on the outer peripheral side, and the abrasive grain layer having a relatively small particle diameter is formed on the inner peripheral side.

  In the present invention, the step is preferably 0.1 to 5.0 mm.

  Furthermore, in this invention, it is preferable to have a recessed part between the outer peripheral side end surface of the said cup-shaped grindstone, and an inner peripheral side end surface.

  Furthermore, in this invention, it is preferable to have R part in the end surface of an outer peripheral side, and the end surface of an inner peripheral side.

Next, the effect of this invention is demonstrated based on FIGS.
In the present invention, the end surface 151 on the outer peripheral side of the cup-shaped grindstone has a step H on the axial mounting portion 14 side of the cup-shaped grindstone with respect to the end surface 152 on the inner peripheral side. As shown in FIG. 1 (c), the abrasive layer 17 is provided on the outer peripheral end surface 151 and the inner peripheral end surface 152. 17A and the abrasive layer 17B, the abrasive layer 17A having a relatively large particle size is formed on the outer peripheral side end surface 151 side, and the abrasive particle layer 17B having a relatively small particle size is formed on the inner peripheral side end surface 152 side. By forming, it has the following effects. In FIG. 1, the cup-type grindstone 10 moves relative to the end face 27 of the honeycomb structure in the direction of the arrow while rotating after setting the cutting amount t as shown in FIG. 1 (b). Grind. Then, the abrasive grain layer 17A on the end face 151 on the outer peripheral side of the cup-type grindstone 10 first grinds the end face 27 of the honeycomb structure, and then the honeycomb in which only the step H remains after the abrasive grain layer 17A on the end face 151 is machined. The end surface of the structure is ground by the abrasive layer 17B of the end surface 152 on the inner peripheral side of the cup-type grindstone. In this case, since the part ground by the abrasive grain layer 17A is an unnecessary part as the honeycomb structure, the abrasive grain layer 17A has a relatively small particle diameter among the two kinds of abrasive grains. A large abrasive grain can be used, and the abrasive grain layer 17B is ground by the abrasive grain layer 17B having a relatively small grain diameter out of the two kinds of abrasive grains. As a result, the chip generated when the abrasive layer 17A on the outer peripheral side end surface 151 of the cup-type grindstone 10 is ground, and then the abrasive layer 17B on the end surface 152 on the inner peripheral side of the cup-type grindstone is finished. As a result, the partition wall is less likely to be chipped at the end face portion of the honeycomb structure and can be processed satisfactorily. Further, since the depth of cut t from the end surface 27 of the ceramic honeycomb structure, the sum of cut amount t ₂ in the cutting depth t ₁ and the inner circumferential end face 152 of the end surface 151 of the outer peripheral side, one of the abrasive grains The amount of cut in the layer can be reduced, the processing load generated on the end face of the ceramic honeycomb structure can be reduced, and the partition wall can be prevented from being chipped. Further, when the cutting amount t is large, the contact surface with the partition wall becomes large, so that the load accompanying processing with the abrasive grain layer 17A increases, and even if the partition wall is chipped, the abrasive grains Since the layer 17B is finished, since the abrasive layer 17B removes the chip generated when the abrasive layer 17A is processed, the chip can be made difficult to occur. This is particularly because the honeycomb structure has a high porosity of 55% or more, and even when the partition walls are brittle, chipping is unlikely to occur and processing can be performed satisfactorily.
Here, when the end face 152 of the inner peripheral side of the cup-type grindstone is ground on the end face of the honeycomb structure in which only the step H remains, the processing load generated on the end face of the ceramic honeycomb structure can be reduced. In order to sufficiently prevent the partition wall from being chipped, the step H is preferably 0.1 to 5.0 mm. When the level difference H is less than 0.1 mm, the end surface 151 on the outer peripheral side of the cup-type grindstone is chipped when the end surface 27 of the ceramic honeycomb structure is ground, and the end surface 152 on the inner peripheral side is ground. Since it becomes difficult to remove, chipping cannot be prevented sufficiently, so 0.1 mm or more is preferable. On the other hand, when the level difference H exceeds 5.0 mm, the end surface 151 on the outer peripheral side of the cup-type grindstone is replaced with the step H remaining after grinding the end surface of the honeycomb structure by the end surface 152 on the inner peripheral side of the cup-type grindstone. When grinding is performed, the load acting on the partition wall is increased, and chipping of the partition wall is likely to occur, so 5.0 mm or less is preferable.
In the present invention, if the angle θ formed between the outer peripheral surface 18 of the cup-shaped grindstone and the end surface 27 of the ceramic honeycomb structure is substantially a right angle, the processed chips are difficult to clog in the cell, and the partition wall is chipped. It is preferable because it becomes difficult. Here, the angle θ formed by the outer peripheral surface 18 of the cup-shaped grindstone and the end face 27 of the ceramic honeycomb structure is substantially a right angle means that θ is in the range of 75 ° to 105 °.

Furthermore, as shown in FIG. 2, it has the recessed part 16 between the end surface 151 of the outer peripheral side of a cup shape grindstone, and the end surface 152 of an inner peripheral side, Therefore The outer peripheral side rather than the recessed part 16 of a cup type grindstone The end surface 151 of the honeycomb structure grinds the end surface of the honeycomb structure, and then the end surface of the honeycomb structure in which the end surface 152 on the inner peripheral side of the concave portion 16 of the cup-type grindstone has a level difference H is ground. In this case, the chips produced by grinding at the end face 151 also gather in the recesses 16 and the collected chips are discharged from the end face of the ceramic honeycomb structure by the rotation of the cup-type grindstone, so that the chips are clogged in the cells. This can prevent the chipping caused in the partition wall.
Here, in order for the chips generated by the processing to collect in the recess 16 and be sufficiently discharged from the end face of the ceramic honeycomb structure by the rotation of the cup-type grindstone, the width L _{1 of the} recess 16 is set to the width L of the end face 15. in contrast, it is preferable L ₁ / L is 0.1 to 0.7. Further, the depth h ₁ of the recess 16 is preferably such that h ₁ / L ₁ is 0.5 to 2.0 with respect to the width L _{1 of the} recess 16. When the ratio L ₁ / L between the width L _{1 of the} recess 16 and the width L of the end face 15 is less than 0.1, the chips generated by the processing are less likely to collect in the recess 16, so that the chips are easily clogged into the cell. Therefore, it is preferable that the partition wall be 0.1 or more. On the other hand, when L ₁ / L exceeds 0.7, the end face 15 of the cup-shaped grindstone 10 becomes narrow and sufficient grinding cannot be performed, so 0.7 or less is preferable. Further, when the ratio h ₁ / L ₁ of width L ₁ of the depth h ₁ and the recess 16 of the recess 16 is less than 0.5, since chips generated by machining is less likely gather in the recess 16, switching into the cell 0.5 or more is preferable because the powder is likely to be clogged and the partition wall is likely to be chipped. On the other hand, if h ₁ / L ₁ exceeds 2.0, the strength of the cup-shaped grindstone 10 itself is lowered and grinding becomes impossible.

Further, as shown in FIGS. 3A and 3B, the cup-shaped grindstone has a partition wall of the honeycomb structure by having R portions R _{1 to} R ₄ on the outer end face 151 and the inner end face 152. This is preferable because the load acting on the partition wall is reduced and the partition wall is less likely to be chipped. The R portion does not need to have all of R _{1 to} R ₄ , and may exist at least at one place, but preferably has at least R ₁ and R ₃ that coincide with the feeding direction of the cup-shaped grindstone. . Here, the radius of the R portion is preferably 0.5 to 3 mm.

  According to the method for manufacturing a ceramic honeycomb structure of the present invention, it is possible to obtain a ceramic honeycomb structure capable of preventing chips generated in partition walls when the end face of the ceramic honeycomb structure is processed using a cup-shaped grindstone. it can.

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS.
(Embodiment 1)
In FIG. 1, the ceramic honeycomb structure 20 is prepared as follows. As the ceramic raw material, at least one ceramic selected from the group consisting of silicon carbide, silicon nitride, cordierite, alumina, mullite, zirconia, aluminum titanate, or a combination thereof is used. To this ceramic raw material, a binder such as methyl cellulose and hydroxypropoxyl methyl cellulose, a surfactant, water and, if necessary, a pore-forming agent such as carbon are added and kneaded to prepare a plastic clay. A ceramic honeycomb structure formed body having a large number of cells is formed by extruding the clay. The formed body is cut to a predetermined length with an ultrafine steel wire, dried and fired to obtain a ceramic honeycomb structure 20 having a large number of cells formed by porous partition walls.
Next, the cup-shaped grindstone 10 is composed of a base 11 and a shaft 12 made of steel such as carbon steel, high-speed steel, die steel, etc., and has a relief portion 13 at the center of the base 11. An abrasive grain layer 17 is formed on the ground portion 15. As the material of the abrasive grains formed on the abrasive grain layer 17, diamond, cubic boron nitride or the like can be used, and those having a grain size of about # 50 to # 270 can be used. Then, as shown in FIG. 1C, two types of abrasive grains are used for the abrasive layer 17, and the abrasive layer 17A having a relatively large particle size is used as the end face 151 on the outer peripheral side among the two types of abrasive grains. The abrasive layer 17B having a relatively small particle size out of the two types of abrasive grains is formed on the grinding part of the end surface 152 on the inner peripheral side. Therefore, for example, a rough grain having a grain size of about # 50 to # 120 can be used for the abrasive grain layer 17A, and a finishing grain having a grain size of about # 100 to # 270 can be used for the abrasive grain layer 17B. Moreover, the thickness of the abrasive grain layer 17 can be about 0.5-5 mm. And in the grinding part 15 in which the abrasive grain layer 17 is formed, the end face 151 on the outer peripheral side has a step H on the axial mounting portion 14 side of the cup-shaped grindstone with respect to the end face 152 on the inner peripheral side. Yes. If the outer diameter of the cup-shaped grindstone 10 is the same as or larger than the outer diameter of the ceramic honeycomb structure 20, the entire end face of the ceramic honeycomb structure is completed by a single process. Therefore, it is preferable.
Then, the end face of the ceramic honeycomb structure is processed as follows by this cup-shaped grindstone.
The outer periphery of the ceramic honeycomb structure 20 is fixed with the fixture 31 of the processing apparatus. The position of the cup-shaped grindstone 10 is determined so that the cut amount t from one end face 27 of the ceramic honeycomb structure 20 is 0.1 to 5 mm. Next, the cup-shaped grindstone 10 is rotated and fed (arrow in the figure), and the end face 27 of the ceramic honeycomb structure 20 is processed. First, the abrasive grain layer 17 </ b> A formed in the grinding portion 15 of the cup-shaped grindstone 10 processes the partition walls of the honeycomb structure 20. In this case, the portion ground by the abrasive grain layer 17A is an unnecessary part for the honeycomb structure, and the grain size of the abrasive grain layer 17A is relatively coarse compared to the abrasive grain layer 17B. Discharged as. Next, the abrasive grain layer 17B finishes the partition walls of the honeycomb structure roughly processed by the abrasive grain layer 17A. In this case, since the portion ground by the abrasive grain layer 17A is processed by the abrasive grain layer 17B having a relatively small grain size out of the two types of abrasive grains, the partition wall is less likely to be chipped at the end face 27 of the honeycomb structure 20. It can be processed well. This means that even when the honeycomb structure has a high porosity of 55% or more and the partition walls are brittle and chipping is likely to occur, the honeycomb structure can be satisfactorily processed without chipping. When the processing of one end surface 27 is completed, the fixture 31 is removed, the ceramic honeycomb structure 20 is reattached, and the other end surface 28 is processed in the same manner. The ceramic honeycomb structure thus processed is then bonded to the end faces 27 and 28, and a film of a predetermined cell to be sealed is opened with heat such as laser light, and the opened cell is formed. Are filled with a slurry for plugging and fired to obtain a ceramic honeycomb filter.

(Embodiment 2)
As the cup-type grindstone 10 shown in Embodiment 1, as shown in FIG. 2, a cup-type grindstone having a concave portion 16 between an outer peripheral end surface 151 and an inner peripheral end surface 152 is used. The recess 16 has a width L _{1 in} a range of L ₁ /L=0.1 to 0.7 with respect to the width L of the end face 15, and a depth h ₁ with respect to the width L _{1 of the} recess 16. H ₁ / L ₁ = 0.5 to 2.0. By using the cup-shaped grindstone of the second embodiment, the chips generated by grinding at the end surface 151 of the cup-shaped grindstone 10 also gather in the recess 16, and the collected chips are collected by the ceramic honeycomb by the rotation of the cup-shaped grindstone. Since it is discharged | emitted from the end surface of a structure, it can prevent that a chip | tip clogs a cell, and can prevent the chip | tip which arises in a partition.

(Embodiment 3)
As shown in FIG. 3, the cup-shaped grindstone 10 shown in the first embodiment is used that has R portions R _{1 to} R ₄ on the outer peripheral end surface 151 and the inner peripheral end surface 152. The radius of the R portion is 0.5 to 3 mm, and the R portion does not need to have all of R _{1 to} R ₄ , and may exist at least one place, but at least R that matches the feeding direction of the cup-shaped grindstone. ₁ and R ₃ may be present. By using the cup-shaped grindstone of the third embodiment, when the cup-shaped grindstone processes the partition walls of the honeycomb structure, the load acting on the partition walls is reduced and the partition wall chips are less likely to occur.

First, a ceramic honeycomb structure was prepared as follows.
Kaolin, talc, silica, by adjusting the powder such as alumina, in a mass _{ratio, SiO 2: 48~52%, Al} 2 O 3: 33~37%, MgO: cordierite generation such as those containing from 12 to 15% As a raw material powder, to this cordierite-producing raw material powder, a binder such as methylcellulose and hydroxypropylmethylcellulose, a lubricant, and graphite as a pore-forming material are added, and after mixing thoroughly in a dry process, a specified amount of water is added, and sufficient Kneaded to produce a plasticized ceramic clay. Next, the kneaded material was extruded using an extrusion mold and cut to obtain a formed body having a honeycomb structure. Then, the formed body is dried and fired, and a cordierite ceramic honeycomb structure having a partition wall thickness of 0.3 mm, a porosity of 65%, an average pore diameter of 20 μm, a pitch of 1.5 mm, an outer diameter of D ₂ 277 mm, and an overall length of 320 mm. It was.

Next, the ceramic honeycomb structure 20 is fixed with a fixture 31, as shown in FIG. The cup-shaped grinding wheel 10 for use in machining of the end surface has an outer diameter _{D 1} is 300 mm, the width L is 30mm of the end surface portion 15, as shown in Table 1, the outer peripheral side of the end surface 151 of the inner end surface 152 Between the outer peripheral end face 151 and the inner peripheral end face 152, the presence and size of the recess 16, the type of the abrasive layer 17, and the R portion of the end face. The position of the cup-shaped grindstone 10 is determined so as to have a predetermined cut amount of 5 mm from one end face 27 of the ceramic honeycomb structure 20 by using the one with the presence or absence changed. Next, the end face 27 of the ceramic honeycomb structure 20 is processed by rotating the cup-shaped grindstone 10 at 400 rpm and feeding it at 1 m / min. And the fixture 31 was removed, the ceramic honeycomb structure 20 was reattached, and the other end surface 28 was processed similarly.
And the presence or absence of a chip of a partition wall was evaluated on the end face of the ceramic honeycomb structure that had been processed. The results are shown in Table 1. The evaluation of the presence or absence of cracks in the partition wall was made by assuming that the number of chips generated per end face of 5 mm or more (pieces / end face) was 1, and that the number of chips generated per end face (pieces / end face) generated in Comparative Example 1 was 1. Expressed as a ratio.

  From the results shown in Table 1, in the cup-type grindstones of Examples 1 to 20 of the present invention, the end surface on the outer peripheral side of the cup-shaped grindstone is closer to the axial mounting portion side of the cup-shaped grindstone than the end surface on the inner peripheral side. An abrasive layer is formed at the grinding site of the cup-shaped grindstone, and the abrasive layer has a relatively large grain layer on the outer peripheral side and a relatively small grain layer. Since it is formed on the inner peripheral side, it can be seen that the occurrence of chipping is small as compared with the case of grinding using the cup-shaped grindstones of Comparative Examples 1 to 3. Especially, since the level | step difference was 0.1-5.0 mm in the cup-shaped grindstone of Examples 2-8, 10-20, generation | occurrence | production of a chip | tip became small. Furthermore, the cup-shaped grindstones of Examples 10 to 20 have a recess between the outer peripheral end surface and the inner peripheral end surface of the cup-shaped grindstone, and the outer peripheral end surface and the inner peripheral end surface are R. It can be seen that the occurrence of chipping is very small.

The figure which showed the process of the ceramic honeycomb structure which concerns on this invention. The figure which showed the cup-shaped grindstone used for the process of the ceramic honeycomb structure which concerns on this invention. The figure which showed the cup-shaped grindstone used for the process of the ceramic honeycomb structure which concerns on this invention. The figure which showed the honeycomb structure used for the filter which collects and purifies PM in the exhaust gas of a motor vehicle. The figure which showed the prior art by the process of the end surface of a ceramic honeycomb structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10: Cup-shaped grindstone 11: Base 12: Shaft 13: Relief part 14: Mounting part 15: Grinding part 151 of cup-shaped grindstone 152: End face 152 on the outer peripheral side: End face 16 on the inner peripheral side: Recess 17: Abrasive grain layer 17A : Abrasive layer A
17B: Abrasive grain layer B
18: outer peripheral surface 20: ceramic honeycomb structure 21: outer peripheral wall 22: partition wall 23, 24: cell 25, 26: sealing portion 27, 28: end face 31 of ceramic honeycomb structure: fixture D ₁ : cup-shaped grindstone Outer diameter D ₂ : Outer diameter of honeycomb structure H: Step height h ₁ : Depth of recess h ₂ : Position from end face 152 L: Width of end face of cup-shaped grindstone L ₁ : Width of recess L ₂ : Cup-shaped grindstone Positions t, t ₁ , t ₂ from the outer peripheral side of: R cut amount R ₁ , R ₂ , R ₃ , R ₄ : R part θ: angle formed by the outer peripheral surface of the cup-shaped grindstone and the end surface of the ceramic honeycomb structure

Claims (4)

In a method for manufacturing a ceramic honeycomb structure in which an end face of a ceramic honeycomb structure having a large number of cells formed by porous partition walls is processed using a cup-shaped grindstone, the cup-shaped grindstone has an end face on its outer peripheral side, With respect to the end surface on the inner circumferential side, there is a step on the axial mounting portion side of the cup-shaped grindstone, and there is an abrasive layer at the grinding part of the cup-shaped grindstone, and the abrasive layer is the cup-shaped grindstone Abrasive grain layers having different grain sizes on the outer peripheral side and the inner peripheral side, and a relatively large abrasive grain layer is formed on the outer peripheral side among the abrasive grains. A method for manufacturing a ceramic honeycomb structure, wherein a small abrasive grain layer is formed on the inner peripheral side. The method for manufacturing a ceramic honeycomb structure according to claim 1, wherein the step is 0.1 to 5.0 mm. The method for manufacturing a ceramic honeycomb structure according to any one of claims 1 to 3, wherein a concave portion is provided between an end face on the outer peripheral side and an end face on the inner peripheral side of the cup-shaped grindstone. The method for manufacturing a ceramic honeycomb structure according to any one of claims 1 to 4, wherein the outer peripheral side end surface and the inner peripheral side end surface have an R portion.

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