JP2000043024A - Method and device for cut-treatment of ceramic molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To completely remove burrs or the like to be generated in the cut parts of ceramic moldings without the generation of defects or the like in the cut parts of ceramic moldings by blowing air from a through hole in the cut parts of the ceramic moldings after cutting the ceramic moldings and at the same time, performing the brushing of the cut parts. SOLUTION: Air is blown from a through hole 13 in the cut parts 12a of ceramic molding 12 by blowing air and at the same time, the cut parts 12a are brushed by using a brushing device or the like to remove the burrs 15 generated by cutting in the cut parts 12a. The burrs 15 are scraped off the cut parts 12a by brushing to become dust which is blown off by air blow together with fine dust stacked near the cut parts 12a. Thus the cut parts 12a free from chips or the like are obtained, and the burrs or the like generated in the cut parts 12a can be completely removed without generating defects or the like in the cut parts 12a of the ceramic molding 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cutting a columnar ceramic molded body in which a large number of through-holes are juxtaposed in the longitudinal direction, and an apparatus for cutting the ceramic molded body.

[0002]

2. Description of the Related Art Recently, it has become a problem that particulates contained in exhaust gas discharged from internal combustion engines such as vehicles such as buses and trucks and construction machines cause harm to the environment and human bodies. Various ceramic filters have been proposed which purify the exhaust gas by collecting particulates in the exhaust gas by passing the exhaust gas through a porous ceramic.

In general, a ceramic filter is formed by bundling a plurality of porous ceramic members 30 as shown in FIG. As shown in FIG. 3, the porous ceramic member 30 has a large number of through holes 31 arranged in the longitudinal direction, and a partition wall 32 separating the through holes 31 functions as a filter.

[0004] That is, in the through hole 31 formed in the porous ceramic member 30, either the inlet side or the outlet side end of the exhaust gas is plugged with the filler 33, and the through hole 31 flows into the one through hole 31. The exhaust gas always passes through the partition wall 32 separating the through hole 31 and then flows out of the other through hole 31. When the exhaust gas passes through the partition wall 32, the particulates are trapped in the partition wall 32 portion. And the exhaust gas is purified.

Conventionally, such a porous ceramic member 3
In the production of No. 0, first, a ceramic powder, a binder, and a dispersion medium are mixed to prepare a mixed composition for producing a molded body, and then the mixture composition is subjected to extrusion molding or the like to obtain a columnar shape. Was formed and cut into a predetermined length using a wire or the like.

Then, the obtained ceramic molded body is dried and the dispersion medium is scattered to produce a dried ceramic molded body having a certain strength and easy to handle.

[0007] In this drying step, it is difficult to dry each part at a completely uniform speed, so that both ends of the dried ceramic molded body may be slightly deformed.
Therefore, when cutting the columnar body after extrusion molding, cut the column slightly longer than the target length, after the drying step, again using a diamond cutter or the like, the target length of the ceramic molded body Had to be cut.

However, as shown in FIG. 1, this cutting causes the vicinity of the cut portion 12a of the ceramic molded body 12 to become
There has been a problem that lumps of chips and so-called burrs 15 and fine powder adhere thereto. In order to remove the burrs 15 and the like, conventionally, fine particles of a resin such as polystyrene have been sprayed on the cut portions using a blast method.

However, when the blast method is used, the structure of the device for spraying the fine particles becomes complicated, which causes a problem that the device becomes expensive, and the fine particles are hit against the cutting portion 12a. 12a has a problem that a small defect occurs.

[0010]

SUMMARY OF THE INVENTION The present invention has been made to solve these problems, and completely eliminates burrs and the like generated at the cut portion of the ceramic molded body without causing defects or the like at the cut portion. It is an object of the present invention to provide a method for cutting a ceramic molded body that can be removed, and a cutting apparatus used for cutting the ceramic molded body.

[0011]

According to the present invention, there is provided a method for cutting a ceramic molded body, comprising a ceramic powder and a binder as main components, and a large number of through-holes arranged in the longitudinal direction with a partition wall therebetween. In the method for cutting a molded body, after cutting the ceramic molded body with a cutter, air is blown out from a through hole in a cutting portion of the ceramic molded body, and at the same time, the cutting portion is brushed, and the cutting is performed. It is characterized in that the burrs generated at the cut portion are removed.

The cutting apparatus for a ceramic molded body according to the present invention is a cutting apparatus for a columnar ceramic molded body comprising a ceramic powder and a binder as main components and having a large number of through-holes arranged in parallel in the longitudinal direction across a partition wall. A cutter for cutting the ceramic molded body, and a blower configured so that an outlet thereof can be brought close to an end of the ceramic molded body facing the cut portion, and around the blower. A brush is implanted, and after the brush comes into contact with a cut portion of the ceramic molded body, a brushing device configured to be able to brush the cut portion by rotating is provided. Things.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of a cutting method and a cutting apparatus of a ceramic molded body of the present invention will be described.
This will be described with reference to the drawings.

The method of cutting a ceramic molded body according to the present invention is a method of cutting a columnar ceramic molded body comprising a ceramic powder and a binder as main components and having a large number of through-holes arranged side by side in a longitudinal direction across a partition wall. After cutting the ceramic molded body with a cutter, air is blown out from a through hole in a cutting part of the ceramic molded body, and at the same time, the cutting part is brushed, and the cutting part generated by the cutting is cut. It is characterized by removing burrs.

In the present invention, the ceramic molded body to be subjected to the cutting treatment comprises a ceramic powder and a binder as main components.

The ceramic powder is not particularly restricted but includes, for example, silicon carbide, silicon nitride, aluminum nitride,
Non-oxide ceramic powders such as boron nitride, titanium nitride, titanium carbide; alumina, cordierite, mullite,
Examples include powders of oxide ceramics such as silica, zirconia, and titania. Among these, silicon carbide, silicon nitride, aluminum nitride, and the like having excellent heat resistance are preferable.

Although the particle size of these ceramic powders is not particularly limited, those having a small shrinkage in the subsequent firing step are preferable. For example, 100 parts by weight of a powder having an average particle size of about 0.3 to 50 μm is used. What combined with 5 to 65 weight part of powder which has an average particle diameter of about 0.1-1.0 micrometer is preferable.

The binder is not particularly limited.
For example, methylcellulose, carboxymethylcellulose, hydroxyethylcellulose, polyethylene glycol, phenol resin, epoxy resin and the like can be mentioned. Usually, the amount of the binder is preferably about 1 to 10 parts by weight based on 100 parts by weight of the ceramic powder.

Since the above-mentioned ceramic molded body is usually subjected to a drying treatment, it contains the above-mentioned ceramic powder and the above-mentioned binder as main components, and was used to give fluidity to the mixed composition during molding such as extrusion molding. Only a very small amount of a dispersion medium or the like is contained. Examples of such a dispersion medium include an organic solvent such as benzene; an alcohol such as methanol; and water.

FIG. 2 is an explanatory view schematically showing one embodiment of the cutting method of the ceramic molded body. FIG.
As shown in FIG. 2, a large number of through-holes 13 are arranged in the longitudinal direction of the ceramic molded body 12 containing the ceramic powder and the binder as main components with a partition wall 14 interposed therebetween. Although the ceramic molded body 12 shown in FIG. 1 has a square prism shape, the shape of the ceramic molded body to be cut is not limited to a square prism shape, and may be a triangular prism or a pentagonal prism shape. It may be cylindrical.

In the present invention, first, a cutter (not shown)
Is used to cut the ceramic compact. At this time, usually, both ends of the ceramic molded body 12 are cut. First, after cutting one end, burrs 15 and the like are removed by performing an air blow or the like described below. The portion may be cut and the burrs 15 may be removed in the same manner.

The cutting method using the above-mentioned cutter is not particularly limited, and cutting can be performed using a cutter similar to a conventionally used cutter. For example, a disk-like shape having a large number of fine diamond particles adhered therearound can be used. Can be cut using a diamond cutter. At this time, as shown in FIG. 1, burrs are generated at the cut portion.

Therefore, as shown in FIG. 2, air is blown out from the through hole 13 in the cut portion 12a of the ceramic molded body 12 at the same time as air blowing.
The cutting portion 12a is brushed by using a brushing device 11 or the like, and burrs 1 of the cutting portion 12a generated by the cutting are removed.
5 is removed. At this time, the flow velocity of the air is 20 to 30.
m / sec is preferable, and the time for air blowing is several seconds to
Several tens of seconds are preferred. Further, it is preferable that the air blow be started at the same time as the brushing or be started earlier than the brushing, and it is preferable that the air blow be performed until the end of the brushing.

The brushing method is not particularly limited. For example, a brushing device 11 in which a brush is planted on a flat plate as shown in FIG.
In addition to the method of moving the brushing device left and right, a method of rotating the disk-shaped brushing device 21 (FIG. 3) as described later can be used.

By the above-mentioned brushing, the burr 15 is scraped off from the cutting portion 12a to form a powder.
Since the powder is blown off by air blowing together with the fine powder deposited in the vicinity, a cut portion free of chips or the like can be obtained. That is, by using the method for cutting a ceramic molded body of the present invention, it is possible to completely remove burrs and the like generated at the cut part without causing defects or the like at the cut part of the ceramic molded body.

Next, a description will be given of an apparatus for cutting a ceramic molded body according to the present invention. The apparatus for cutting a ceramic molded body according to the present invention is a cutting apparatus for a columnar ceramic molded body containing a ceramic powder and a binder as main components and having a large number of through-holes juxtaposed in a longitudinal direction across a partition wall. ,
A cutter for cutting the ceramic molded body, a blower configured to be able to make an outlet thereof close to an end of the ceramic molded body opposed to a cut portion, and a brush is planted around the blower, After the brush comes into contact with the cutting portion of the ceramic molded body,
A brushing device configured to be able to perform brushing on the cutting section by rotating.

The ceramic molded body which is the object of the ceramic molded body cutting apparatus of the present invention is the same as that which is the object of the ceramic molded body cutting method. FIG.
FIG. 1 is a plan view schematically showing an apparatus for cutting a ceramic molded body according to the present invention. After being placed on a movable and rotatable table, the ceramic molded body 12 is carried into the cutting apparatus of the present invention, and is firstly cut by a cutter (not shown).

As the cutter for cutting the ceramic molded body, the same cutter as conventionally used can be used. Two cutters may be provided so that both ends can be cut at once. When the ceramic molded body is rotated after cutting one end to cut the other end, one cutter may be provided.

The blower 16 used for blowing air from the through hole 13 of the ceramic molded body 12 performs air blowing with its outlet close to an end 12b of the ceramic molded body 12 facing the cut portion 12a. What is constituted so that it can perform is preferable. The outlet may be fixed as long as it does not interfere with the movement of the ceramic molded body 12. After the ceramic molded body 12 is fixed at a predetermined position, the end portion 12
It may be movable so as to be close to b. Blower 1
The air flow rate at the outlet of No. 6 is 20 to 30 m
/ Sec is preferable, and the time for performing the air blow is preferably several seconds to several tens of seconds.

As the brushing device, a brushing device 21 having a substantially circular shape in a plan view, around which a brush 21a is planted, as shown in FIG. 3, is used. The brushing device 21 is movable, and after the ceramic molded body 12 is fixed at a predetermined position, the brush 21a moves to a position where the brush 21a comes into contact with the cutting portion 12a. It is configured to perform brushing and scrape off burrs 15 generated on the cutting portion 12a.

The material of the brush 21a of the brushing device 21 is not particularly limited, but is preferably a highly flexible resin, and more preferably, polyethylene, polypropylene or the like. In addition, conditions such as the size and the rotation speed of the brushing device 21 depend on the size of the target ceramic molded body and cannot be unconditionally determined. For example, the size is 33 mm × 33 mm × 300 mm, 1
Ceramic molded body 12 having 200 pieces / square inch 3
When the target is a target, its diameter is about 80 mm and 2
What can rotate at the rotation speed of about 00 rpm is preferable.

Normally, as shown in FIG. 1, the burrs 15 are generated in a certain direction depending on the cutting direction.
Brushing device 21 so that it is in the direction of stripping 5
Is preferably rotated.

At the time of the above-mentioned brushing, air blow is performed, so that the scraped-off burrs 15 and the fine powder deposited near the cutting portion 12a are blown outward and the burrs 15 of the cutting portion 12a are removed. Is removed.

The ceramic molded body 12 is mounted on a rotatable table. After the above steps are completed, the table on which the ceramic molded body 12 is mounted is rotated by half a turn, and the same processing is performed once again. The burr 15 and the like of the cutting portion 12a are removed.

The apparatus for cutting a ceramic molded body according to the present invention includes a control device having a microcomputer built therein. The control device receives a control signal from the control device, and controls the movement and rotation of the ceramic molded body. The movement and rotation of the brushing device 21 and the operation of the blower 16 can be automatically performed as a series of operations described above.

[0036]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples.

Example 1 70 parts by weight of α-type silicon carbide powder having an average particle diameter of 30 μm, 30 parts by weight of β-type silicon carbide powder having an average particle diameter of 0.28 μm,
5 parts by weight of methylcellulose, 4 parts by weight of a dispersant, and 20 parts by weight of water were blended and uniformly mixed to prepare a mixed composition of raw materials. This mixed composition was charged into an extruder, and a honeycomb formed body was produced at an extrusion speed of 2 cm / min. This honeycomb formed body has a size of 33 mm × 3
It was 3 mm × 300 mm, the number of through holes 13 was 200 / in 2, and the thickness of the partition wall was 0.35 mm.

Next, drying was performed at a temperature of 80 ° C. while irradiating microwaves using a drying apparatus to dry the ceramic molded body. Next, using the cutting apparatus shown in FIG. 3, after cutting both end portions, the wind speed of the outlet of the blower 16 is set to 30 m / sec, and the brushing device 21 is rotated at a speed of 200 rpm to thereby make both of the two. The burrs 15 generated in the cutting portion 12a were removed.

As a result, the burrs 15 generated in the cut portion 12a of the ceramic molded body 12 and the fine powder deposited near the cut portion 12a have been completely removed.
No scratches or defects were found in 2a.

COMPARATIVE EXAMPLE 1 Instead of using a brushing device, a ceramic molded body was cut under the same conditions as in Example 1 except that polystyrene fine particles were sprayed on the cutting portion 12a using a blaster device. As a result, the burrs 15 generated in the cut portion 12a of the ceramic molded body 12 and the fine powder deposited near the cut portion 12a were completely removed.
2a had a considerable number of scratches and defects.

[0041]

As described above, the method for cutting a ceramic molded body according to the present invention is as described above, so that burrs and the like generated at the cut part of the ceramic molded body are completely removed without causing any defects or the like at the cut part. be able to.

Further, since the apparatus for cutting a ceramic molded body of the present invention is as described above, by using this apparatus for cutting a ceramic molded body, the cutting section of the ceramic molded body can be cut without causing defects or the like. Can be completely removed.

[Brief description of the drawings]

FIG. 1 is a perspective view schematically showing a state after cutting a ceramic molded body.

FIG. 2 is an explanatory view schematically showing a method for cutting a ceramic molded body according to the present invention.

FIG. 3 is a plan view schematically showing an apparatus for cutting a ceramic molded body according to the present invention.

FIG. 4 is a perspective view schematically showing a porous ceramic member constituting the ceramic filter.

[Explanation of symbols]

 11, 21 Brushing device 11a, 21a Brush 12 Ceramic molded body 12a Cutting portion 12b End 13 Through hole 14 Partition wall 15 Burr 16 Blower

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B28D 1/24 B01D 53/36 103C F-term (Reference) 3B116 AA11 AA46 AB42 BA02 BA14 BB62 CD41 3C069 BB01 BB04 CA03 DA07 EA05 4D048 AA21 BA01X BA03X BA04X BA05X BA06X BA07X BA08X BA10X BA41X BA42X BA45X BA46X BB02 BB05 CC70 4G055 AA08 AA10 AC05 AC10 BA76 BA85 BA87 BB01 BB05 BB12 4G069 BA13A BA13 EB03 CB01

Claims (2)

[Claims] 1. A method for cutting a columnar ceramic molded body comprising a ceramic powder and a binder as main components and having a large number of through-holes juxtaposed in a longitudinal direction with a partition wall therebetween, comprising: After cutting by, air is blown out from a through hole in a cutting portion of the ceramic molded body, and at the same time, the cutting portion is brushed to remove fine powder generated by the cutting and burrs of the cutting portion. Cutting method of a ceramic molded body. 2. A cutting device for a columnar ceramic molded body mainly composed of a ceramic powder and a binder and having a large number of through holes arranged in a longitudinal direction with a partition wall therebetween, wherein the ceramic molded body is cut. And a blower configured such that the outlet of the cutter can be close to the end of the ceramic molded body facing the cut portion, and a brush is planted around the blower, and the ceramic molded body is A brushing device configured to be able to perform brushing on the cutting portion by rotating the brush after the brush comes into contact with the cutting portion.