JP4732194B2 - Cutting method and cutting apparatus for ceramic honeycomb formed body - Google Patents

Description

  The present invention relates to a method for cutting a ceramic honeycomb molded body and a cutting apparatus for cutting the ceramic honeycomb molded body at a substantially right angle with respect to the direction of through holes.

  A ceramic honeycomb structure used as a dust collection filter, an exhaust gas purification catalyst carrier, etc. is formed by forming a clay containing ceramic powder into a honeycomb shape, cutting the formed body into an appropriate length, and then drying and firing. Manufactured by. Therefore, there is a need for means for cutting a soft and easily deformable ceramic honeycomb molded body without affecting the shape. Conventionally, as such means, as shown in FIG. A method of cutting by applying tension to the thin wire 2 stretched by the spring 3 and reciprocating the thin wire 2 in the longitudinal direction, as shown in FIG. 4, bobbins 8 provided on two servo motors 7 While adjusting the torque of the servomotor 7 to give an appropriate tension to the thin wire 2 between them, the thin wire 2 is run in the process of winding the thin wire 2 around one bobbin 8 by the rotation of the servo motor 7 and cut. The method to do has been performed.

  However, in the above method, since the thin wire 2 is cut while moving in the length direction, the load in the moving direction of the thin wire 2 is applied to the workpiece due to the resistance when cutting the thick outer periphery of the ceramic honeycomb formed body 5. As a result, the ceramic honeycomb formed body 5 is distorted. In particular, since the partition wall of the honeycomb structure is in the direction of becoming thinner from the conventional 150 μm to 50 to 125 μm or less in recent years, the aperture ratio of the honeycomb structure cross section is increased, and the strength of the honeycomb molded body is increased. The problem of distortion due to cutting is more serious because of the smaller.

  Further, not only the distortion of the whole honeycomb formed body but also the partition walls of the honeycomb structure are deformed and crushed by a downward load at the time of cutting. In order to avoid this phenomenon, the cutting may be performed more slowly, but the cutting efficiency is reduced.

  Also, since the thin wire is cut while moving in the length direction, the life of the thin wire is short and the thin wire must be replaced frequently. However, it is necessary to adjust the tension each time the thin wire is replaced. The cutting efficiency of the body was remarkably impaired.

Accordingly, in view of the above situation, the present applicant has provided a cutting guide groove on the outer periphery of the ceramic honeycomb molded body, and a cutting method for cutting the ceramic honeycomb molded body only by applying a fine line to the ceramic honeycomb molded body and pressing it on the ceramic honeycomb molded body (Refer to Patent Document 1). This cutting method is a preferable method in that the ceramic honeycomb formed body having thin partition walls can be cut without causing distortion, but there is a demand for further improving the cutting efficiency.
That is, in the conventional cutting method, the fine wire is usually lowered from the top to the bottom to cut the ceramic honeycomb formed body. In this case, the fine wire is cut into the ceramic in order to cut the ceramic honeycomb formed body again after cutting. It is necessary to return to the cutting start position above the honeycomb formed body. Therefore, when continuously cutting the ceramic honeycomb formed body, the thin wire return time has hindered improvement in cutting efficiency. Moreover, this has become a big bottleneck when trying to improve the cutting efficiency by increasing the extrusion speed of the ceramic honeycomb formed body.
JP 2001-96524 A

  The present invention has been made in view of such a situation, and the object of the present invention is to improve the cutting efficiency more than before without causing distortion in the ceramic honeycomb formed body, so that the return time of the fine wire is almost the same. It is an object of the present invention to provide a method and apparatus for cutting a ceramic honeycomb formed body that can be omitted.

That is, according to the present invention, there is provided a method for cutting a ceramic honeycomb molded body, in which the ceramic honeycomb molded body is cut at a right angle with respect to the direction of the through-holes by a thin wire stretched with an appropriate tension. a plurality of bobbins set of one bobbin, with two thin lines circulation mechanism for circulating movement fine lines strung between the bobbin, the thin wire of the bobbin setting while circulating moved while maintaining a predetermined interval bobbin setting the plurality of There is provided a method for cutting a ceramic honeycomb formed body that moves downward and cuts the ceramic honeycomb formed body.

  Further, according to the present invention, the ceramic honeycomb formed body is placed in a state in which the through-hole direction is in the horizontal direction, and a cradle that moves at a predetermined speed in the through-hole direction; A plurality of bobbin sets each having two bobbins arranged with thin wires stretched at an appropriate tension are provided, and the plurality of bobbin sets are circulated and moved at the same speed and in the same direction as the ceramic honeycomb molded body while maintaining a predetermined interval. And a fine wire circulation mechanism that moves to the ceramic honeycomb formed body cutting device, wherein the cradle has a gap in a portion corresponding to a cutting position of the ceramic honeycomb formed body, and the fine wire circulation mechanism A ceramic honeycomb formed body that cuts the ceramic honeycomb formed body by moving a thin line of one bobbin set provided in the mechanism downward. Cutting device, it is provided.

  In the above, it is preferable that the thin wire circulation mechanism is provided with two guide rails for circulating and moving each of the two bobbins provided with the thin wires at a predetermined interval.

  According to the cutting method and the cutting apparatus of the present invention, there is a remarkable effect that the cutting efficiency can be increased more than before without causing distortion in the ceramic honeycomb formed body.

  Hereinafter, the present invention will be described in more detail with reference to the drawings. However, the present invention should not be construed as being limited thereto, and various modifications, modifications, Modifications and improvements can be added.

  FIG. 1 schematically shows an embodiment of a cutting method and a cutting apparatus according to the present invention. Reference numeral 10 denotes a ceramic honeycomb formed body, and the ceramic honeycomb formed body 10 is placed on a receiving base 11 that moves at a predetermined speed in the through hole direction with the through hole direction set in the horizontal direction. The cradle 11 has a gap 20 at a portion corresponding to the cutting position of the ceramic honeycomb formed body 10 as shown in FIG. Further, the cradle 11 is placed on a moving mechanism 19 such as a belt, and moves to the left in FIG. 2 at a predetermined speed.

  In the vicinity of the ceramic honeycomb formed body 10, a fine wire circulation mechanism 12 is disposed. The thin wire circulation mechanism 12 includes a plurality of bobbin sets 16 including two bobbins 15a and 15b in which a thin wire 14 is stretched with an appropriate tension. The thin wire circulation mechanism 12 includes two guide rails 17a and 17b for circulating and moving the two bobbins 15a and 15b each having the thin wire 14 provided at a predetermined interval. Two bobbins 15a and 15b are circulated and moved clockwise in FIG. 1 along 17b.

The plurality of bobbin sets 16 provided in the thin wire circulation mechanism 12 are installed with each bobbin set 16 maintaining a predetermined interval.
In the cutting device of the present invention, the fine wire 14 stretched between the two bobbins 15a and 15b of the one bobbin set 16 provided in the fine wire circulation mechanism 12 circulates clockwise and moves downward. As a result, the ceramic honeycomb formed body 10 is cut.

  In the present invention, among the plurality of bobbin sets 16 provided in the thin wire circulation mechanism 12, one bobbin set 16 a always circulates and moves so as to be disposed at an upper position close to the ceramic honeycomb formed body 10. Therefore, after the ceramic honeycomb formed body 10 is cut by the thin wire 14 stretched between the two bobbins 15 a and 15 b, the next one bobbin set 16 circulates and moves to an upper position close to the ceramic honeycomb formed body 10. Then, since the ceramic honeycomb molded body 10 is cut next, the time required for the return operation of the thin wire can be made almost zero, and the cutting efficiency can be greatly increased.

  Further, in the present invention, the cradle 11 has a gap 20 at a portion corresponding to the cutting position of the ceramic honeycomb formed body 10 and, as shown in FIG. 2, a predetermined speed (extrusion speed) in the left direction in the figure. ) While moving the fine wire circulation mechanism 12 in the same direction and at the same speed, the one bobbin set 16 moves downward from the upper position A close to the ceramic honeycomb formed body 10. The fine wire 14 cuts the ceramic honeycomb formed body 10 and moves down to the position of the gap 20 (lower position B) provided in the cradle 11.

  A removable fitting member 19 a is fitted to a lower position of the gap 20 provided in the cradle 11 on the moving mechanism 19 such as a belt on which the cradle 11 is placed. When the thin wire 14 is lowered to the position of the gap 20 (lower position B), it is removed to form a gap, and the fine wire 14 passes through the gap.

  The upper position A of the bobbin set 16 is appropriately changed depending on the extrusion speed of the ceramic honeycomb molded body 10. For example, if the extrusion speed of the ceramic honeycomb molded body 10 is higher, the position in FIG. If it is later, it is changed to the left side of the figure.

  In the present invention, as described above, the thin wire circulation mechanism 12 is provided, and each bobbin set 16 is arranged so as to reach the upper position A close to the ceramic honeycomb formed body 10 so that the plurality of bobbin sets 16 are not time-delayed one after another. Since 16 is circulated and moved, the time required for cutting the ceramic honeycomb formed body 10 is substantially only the cutting time, and the time required for the return operation of the thin wire after the cutting required in the conventional cutting method (waiting time) ) Can be made substantially zero, and the cutting efficiency can be greatly increased.

  In the present invention, there is no particular limitation on the material of the thin wire, as long as it can suitably cut the ceramic honeycomb molded body, piano wire, steel wire, synthetic resin fiber, fiber wire such as carbon fiber, or diamond coating, A thin wire or the like in which small particles are scattered can be suitably used. Moreover, it is preferable that the diameter of a thin wire | line is 20-100 micrometers.

  In the present invention, in order to cut the ceramic honeycomb formed body 10 using the fine wires 14, it is usually preferable to move the fine wires 14 downward at a speed of 250 mm / second or less. This is because if it exceeds 250 mm / sec, the cell structure may be deformed and crushed due to the thickness of the partition wall.

  Further, the shape of the end face of the ceramic honeycomb molded body cut by the cutting method and apparatus of the present invention is not particularly limited, and the ceramic honeycomb molding having end faces of various shapes such as a circle, an ellipse, a square, a triangle, a pentagon, and a hexagon. The body can be cut appropriately.

  EXAMPLES Hereinafter, although this invention is demonstrated in more detail using an Example and a comparative example, this invention is not limited to these Examples.

(Comparative example)
The ceramic honeycomb formed body was cut by pressing the fine wire in the vertical direction (from top to bottom). After cutting, the fine wire was returned to the top (raised), and the ceramic honeycomb formed body was cut again.
The ceramic honeycomb molded body used had a round end shape of 111.0 mm in diameter, a partition wall thickness of 120 μm, a cell pitch of 1.40 mm, and an outer peripheral thickness of 0.50 mm. The extrusion rate of the body was 39 mm / sec. The fine wire made of steel with a diameter of 0.070 mm was used. Cutting was performed by moving the thin wire downward at a speed of 200 mm / sec.
As a result, the waiting time that did not contribute to cutting was 8.1 seconds.

(Example)
As shown in FIGS. 1 to 2, the ceramic honeycomb formed body extruded in the same shape as the comparative example at the same extrusion speed was cut by circulating the fine wire 14 clockwise in the figure.
As a result, the waiting time not contributing to cutting was 3.0 seconds.
Thus, as in the present invention, the ceramic honeycomb formed body is circulated and cut downward using the thin wire circulation mechanism 12 and is cut in the downward direction, which is about 5 seconds as compared with the conventional longitudinal cutting. Shortening of the cutting time could be achieved.
Further, when the distortion (roundness) of the ceramic honeycomb molded body after cutting was measured, almost no distortion occurred.

  According to the cutting method and apparatus of the present invention, a ceramic honeycomb formed body having thin partition walls can be cut without causing distortion, the cutting time can be greatly shortened, and the cutting efficiency is greatly improved. Can be made. Therefore, by drying and firing the obtained ceramic honeycomb molded body, a ceramic honeycomb structure used as a dust collection filter, an exhaust gas purifying catalyst carrier and the like can be efficiently manufactured, which is extremely useful in industry.

It is explanatory drawing which shows roughly one Embodiment of the cutting method and cutting device which concern on this invention. It is side explanatory drawing which looked at the movement (downward movement) of the thin wire | line in this invention from the side. It is explanatory drawing which shows an example of the conventional cutting method. It is explanatory drawing which shows the other example of the cutting method in the past.

Explanation of symbols

1: pulley, 2: fine wire, 3: spring, 7: servo motor, 8: bobbin, 10: ceramic honeycomb molded body, 11: cradle, 12: fine wire circulation mechanism, 14: fine wire, 15a, 15b: a pair of bobbins , 16: bobbin set, 17a, 17b: guide rail, 19: moving mechanism, 19a: fitting member, 20: gap.

Claims (5)

A method for cutting a ceramic honeycomb molded body, in which a ceramic honeycomb molded body is cut at a right angle with respect to the direction of the through-holes with a fine wire stretched at an appropriate tension,
A plurality of bobbins set of two bobbins, two thin lines with thin line circulation mechanism for circulating movement stretched between the bobbin, the bobbin setting while circulating moved while maintaining a predetermined interval bobbin set of said plurality of thin lines A method for cutting a ceramic honeycomb molded body, in which the ceramic honeycomb molded body is cut by moving downwardly. The method for cutting a ceramic honeycomb molded body according to claim 1, wherein the fine wire circulation mechanism also moves at the same speed in the same direction with respect to the ceramic honeycomb molded body moving at a predetermined speed. The method for cutting a ceramic honeycomb formed body according to claim 1 or 2, wherein the fine wire circulation mechanism is provided with two guide rails for circulating and moving two bobbins provided with fine wires at predetermined intervals. A cradle that moves the ceramic honeycomb formed body at a predetermined speed in the direction of the through-hole while placing the ceramic honeycomb molded body in a state in which the direction of the through-hole is horizontal.
The ceramic honeycomb is provided with a plurality of bobbin sets including two bobbins arranged in the vicinity of the ceramic honeycomb formed body and having fine wires stretched at an appropriate tension, and the plurality of bobbin sets are circulated while maintaining a predetermined interval. A fine wire circulation mechanism that moves in the same direction at the same speed as the compact,
A ceramic honeycomb formed body cutting device comprising:
The cradle has a gap in a portion corresponding to the cutting position of the ceramic honeycomb formed body, and moves the thin wire of one bobbin set provided in the fine wire circulation mechanism downward, thereby moving the ceramic A ceramic honeycomb molded body cutting device for cutting a honeycomb molded body. 5. The cutting apparatus for a ceramic honeycomb molded body according to claim 4 , wherein the fine wire circulation mechanism is provided with two guide rails for circulating and moving two bobbins provided with fine wires at predetermined intervals.

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