JP2020192718A - Method of dividing ceramic molded article - Google Patents

Abstract

To provide a method capable of suitably dividing a ceramic molded article.SOLUTION: A method of dividing a ceramic molded article along a predetermined division target position in a thickness direction includes: a mounting step of mounting the ceramic molded article on an elastic body horizontally; and a breaking step of forming a cut on the ceramic molded article at the division target position by bringing a break plate into contact with the ceramic molded article mounted on the elastic body with respect to the division target position from an upper face side and pressing the break plate with a predetermined pressing amount that is 1/3 or larger and 9/10 or smaller of a thickness of the ceramic molded article and dividing the ceramic molded article at the predetermined target position by developing a crack from a lower end part of the cut in a thickness direction of the ceramic molded article.SELECTED DRAWING: Figure 3

Description

The present invention relates to a method for dividing a ceramic molded product.

The ceramic substrate is used as a base substrate for various devices, and may also be used as a functional substrate in which various functional components are incorporated in the substrate itself. As a method for obtaining such a ceramic substrate, a scribing process is performed in which a large-sized mother substrate is prepared for the time being, and then a scribe line is formed in advance at a position where one main surface of the mother substrate is scheduled to be divided, and the other main surface is divided. A method of dividing a mother substrate by a break process in which a break plate is brought into contact with a planned position and the break plate is further pushed (three-point bending) to extend a crack from a scribe line is already known. (See, for example, Patent Document 1). In such a case, the mother substrate is a ceramic fired body obtained by firing a ceramic molded body produced by mixing a predetermined ceramic powder with a predetermined binder, a solvent, or the like and then molding it into a plate shape. ..

Japanese Unexamined Patent Publication No. 2014-83821

Further, instead of the above, a method may be used in which the ceramic molded body before firing is divided by a break plate and the individual pieces obtained by the division are fired. In general, a ceramic molded product has a certain hardness although it is inferior to a fired product. Therefore, conventionally, when dividing a ceramic molded product by this method, a break plate with a sharp cutting edge is prepared and a rigid table (stage) is used. This was done by bringing the sharp cutting edge of the ceramic molded body placed above into contact with the planned cutting position, pushing down the break plate, and tearing the molded body.

In order to obtain a good quality cross section, it is necessary to push the break plate down to the lowermost end in the thickness direction of the molded product, but in that case, the break plate comes into contact with the table and the cutting edge is damaged or the table is damaged. There was a problem that it would end up. In addition, when the lowering of the break plate is stopped halfway in the thickness direction in order to avoid such damage, and a tensile force is applied to the molded body from the left and right so as to tear the part below it. There was a problem that a good cross section could not be obtained.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a method capable of suitably dividing a ceramic molded product.

In order to solve the above problems, in the invention of claim 1, a ceramic molded body formed by mixing a predetermined ceramic powder with an organic material and molding it into a plate shape is formed in a thickness direction along a predetermined planned division position. It is a method of dividing into two parts, that is, a mounting step of horizontally placing the ceramic molded body on the elastic body, and an upper surface side with respect to the planned division position of the ceramic molded body placed on the elastic body. By bringing the break plate into contact with the ceramic molded body and further pushing the break plate with a predetermined pushing amount of 1/3 or more and 9/10 or less of the thickness of the ceramic molded body, the ceramic molded body is pressed at the planned division position. It is characterized by comprising a break step of forming a notch and further extending a crack from the lower end of the notch in the thickness direction of the ceramic molded body to divide the ceramic molded body at the planned division position.

The invention according to claim 2 is the method for dividing a ceramic molded product according to claim 1, wherein the cutting edge angle of the break plate is 5 ° to 25 °.

The invention of claim 3 is the method for dividing a ceramic molded product according to claim 1 or 2, wherein the elastic body is a rubber having a hardness of 60 ° to 90 °.

The invention of claim 4 is the method for dividing a ceramic molded body according to any one of claims 1 to 3, and in the pre-described step, the ceramic molded body is attached and fixed to a predetermined fixing member. Then, the fixing member is placed on the elastic body in such a manner that the fixing member is brought into contact with the elastic body.

According to the inventions of claims 1 to 4, the ceramic molded product can be divided along the planned division position with excellent cross-sectional quality.

It is a figure which shows typically the state of dividing a plate-shaped ceramic molded body 1 perpendicularly in the thickness direction along the planned division position P predetermined in the predetermined direction. It is a figure which shows the state in the middle of the break process of the ceramic molded body 1 performed by using the break device 100 step by step. It is a figure which shows the state in the middle of the break process of the ceramic molded body 1 performed by using the break device 100 step by step. It is a figure which shows the state in the middle of the break process of the ceramic molded body 1 performed by using the break device 100 step by step. It is a figure which shows the state in the middle of the break process of the ceramic molded body 1 performed by using the break device 100 step by step.

FIG. 1 schematically shows a state in which a plate-shaped ceramic molded body 1 to be divided in the present embodiment is divided perpendicularly in the thickness direction along a predetermined division planned position P predetermined in a predetermined direction. It is a figure which shows. The ceramic molded body 1 can be divided according to this aspect by a break process using the break device 100 shown in FIG. Further, FIGS. 2 to 5 are diagrams showing step by step a state in the middle of the break processing of the ceramic molded body 1 performed by using the break device 100.

The ceramic molded body 1 is formed into a plate shape after mixing a predetermined ceramic powder with a predetermined binder, an organic material such as a solvent, and the like. Usually, the individual pieces obtained by the division are fired, and the fired body (ceramic chip) obtained by this is used for various purposes.

As the ceramic powder, alumina powder, LTCC (co-fired ceramic) powder such as ferrite powder, and various other ceramic powders that can form the ceramic molded body 1 are appropriately adopted depending on the application of the finally obtained ceramic chip. It is possible.

The ceramic molded body 1 can be obtained by various known methods such as a doctor blade method and a gel casting method, in addition to a so-called green sheet process in which a plurality of ceramic green sheets are laminated and integrated.

The ceramic molded body 1 has, for example, a thickness of about 0.5 mm to 1.0 mm and a plane size of about 3 mm to 20 mm (for example, a rectangular shape has a side length, and a circular shape has a diameter). Have.

In FIG. 1, for the sake of simplicity of explanation, only one scheduled division position P is shown, but in reality, the ceramic molded body 1 is divided along a plurality of predetermined planned division positions P. May be good.

The break device 100 mainly includes an elastic body 101 capable of downwardly supporting a break object in a horizontal posture, and a break plate 102 which is a plate-like member having a cutting edge 102e having a substantially triangular cross section in the vertical direction.

As the elastic body 101, the ceramic molded body 1 can be supported downward in a horizontal posture in a state where the ceramic molded body 1 as a break target is placed on the upper surface 101a thereof, and in such a downward supporting state. Moreover, those having elasticity in the vertical direction are used. As long as the above requirements are satisfied, the holding mode of the elastic body is not limited. For example, the elastic body 101 may be supported downward by a table (not shown), or may have an end portion held by a holding means (not shown).

Further, as the material of the elastic body 101, a material satisfying the above requirements may be appropriately adopted. For example, rubbers having a hardness of 60 ° to 90 °, such as urethane rubber, silicone rubber, ethylene propylene rubber, and nitrile butadiene rubber, are exemplified.

In FIG. 1, for the sake of simplicity of illustration, the upper surface 101a of the elastic body 101 is horizontal in the state where the ceramic molded body 1 is placed, but this is not an essential aspect, and the ceramic molded body 1 is used. The upper surface 101a may be partially bent or curved by sinking due to its own weight.

The break plate 102 is a plate-shaped metal (for example, cemented carbide) member provided with a cutting edge 102e having a substantially isosceles right triangle shape extending in the blade crossing direction. In FIG. 1, the break plate 102 is shown so that the blade crossing direction is perpendicular to the drawing. The break plate 102 is held (held) by a holder (not shown) at a predetermined position above the elastic body 101, and is provided with the holder so as to be able to move up and down by an elevating mechanism (not shown).

More specifically, it is preferable to use a break plate 102 having an angle (edge angle) θ of the cutting edge 102e of 5 ° to 25 °. The tip of the cutting edge 102e may form a curved surface having a radius of curvature of 1 μm to 10 μm. Further, the size (thickness, length, height, etc.) of the break plate 102 and specific break conditions may be determined according to the material and thickness of the ceramic molded body 1.

When performing the division, first, the ceramic molded body 1 is placed on the elastic body 101, and the planned division position P and the cutting edge 102e of the break plate 102 are in the same vertical plane (the plane perpendicular to the drawing in FIG. 1). Positioned so that it is located within.

Then, when the ceramic molded body 1 is placed and further positioned in such an embodiment, the break plate 102 is subsequently lowered toward the planned division position P as shown by the arrow AR1 in FIG. .. More specifically, it is lowered toward the position of the virtual intersection line Pb between the planned division position P and the surface of the ceramic molded body 1, which extends in the direction perpendicular to the drawing. Even after the break plate 102 comes into contact with the surface of the ceramic molded body 1 at the position of the intersection line Pb, the break plate 102 is further lowered (pushed) by a predetermined distance.

In the following, the height position of the surface of the ceramic molded body 1 (intersection line Pb) which is placed on the elastic body 101 as shown in FIG. 1 and is not in contact with the break plate 102. (Height position) is the origin, and the vertical lower direction is the positive direction, and the position (descending distance from the origin) of the break plate 102 (of the cutting edge 102e) is represented. For example, as shown in FIG. 1, Z <0 while the break plate 102 is not in contact with the ceramic molded body 1. Further, the descending distance from Z = 0 when the break plate 102 is lowered for division is referred to as a pushing amount.

The break plate 102 lowered as shown by the arrow AR1 in FIG. 1 eventually comes into contact with the ceramic molded body 1 at the position of the intersection line Pb (Z = 0).

FIG. 2 is a diagram showing a state immediately after the contact. When the break plate 102 is continuously lowered as shown by the arrow AR2 in FIG. 2 after the contact, the force of the break plate 102 to push down the ceramic molded body 1 is located at the planned division position P. As a result of the action, as shown in FIG. 2, the ceramic molded body 1 undergoes deformation (deflection) that becomes convex vertically downward in symmetry with respect to the planned division position P, and the elastic body 101 is also compressed according to the deformation. Be transformed. The position of the break plate 102 in FIG. 2 is Z = Z1.

FIG. 3 is an enlarged view of the vicinity of the break plate 102 when the position of the break plate 102 is Z = Z2 further below Z = Z1.

At the time of Z = Z1 shown in FIG. 2, since the force that the break plate 102 tries to push down the ceramic molded body 1 is absorbed by the deformation by the elastic body 101, the ceramic molded body 1 is deformed as a whole. However, as the lowering of the break plate 102 further progresses, the force acting from the break plate 102 is absorbed depending on the deformation of the ceramic molded body 1 and the deformation of the elastic body 101 to support the break plate 102. You will not be able to. As a result, as shown in FIG. 3, the cutting edge 102e of the break plate 102 enters the ceramic molded body 1 along the planned division position P, and a slit (cut) SL is formed. For convenience of illustration, the slit SL is exaggerated and is actually sufficiently narrower than the size of the ceramic molded body 1.

Once the slit SL is formed in this way, as shown in FIG. 3, a force is applied from the break plate 102 toward the ceramic molded body 1 in two diagonally downward directions symmetrical with respect to the planned division position P. F1 comes to work. On the other hand, with respect to the elastic body 101 to the ceramic molded body 1, the drag force F2 in a direction inclined toward the break plate 102 side from the vertically upper side acts symmetrically with respect to the planned division position P. Then, in the upper part in the thickness direction, the in-horizontal component force of the force F1 acts outward from the planned division position P, and in the lower part in the thickness direction, the in-horizontal component force of the force F2 acts toward the planned division position P. .. As a result, torque T is generated in opposite directions with the planned division position P below the break plate 102 in between. Then, due to the action of the torque T, the crack CR extends in the thickness direction starting from the lower end of the slit SL. Finally, the crack CR reaches the lower end of the ceramic molded body 1 in the thickness direction.

FIG. 4 is a diagram showing a state when the crack CR reaches the lower end portion in the thickness direction of the ceramic molded body 1. The position of the break plate 102 at this time is Z = Z3. The fact that the crack CR reaches the lower end of the ceramic molded body 1 in the thickness direction is nothing but the division of the ceramic molded body 1. That is, as a result of the expansion of the crack CR as shown in FIG. 3, the ceramic molded body 1 is divided even if the break plate 102 is not pushed down to the lower end portion in the thickness direction of the ceramic molded body 1. In this case, the break plate 102 is lowered so that the pushing amount is Z3, so that the ceramic molded body 1 is divided.

FIG. 5 is a diagram showing a state when the break plate 102 is retracted to the initial position after the completion of the division. The compression of the elastic body 101 is eliminated, and the two pieces 1a and 1b formed by the division of the ceramic molded body 1 are placed horizontally.

The specific setting of the pushing amount varies depending on the material and thickness of the ceramic molded body 1 to be divided, the material and hardness of the elastic body 101, the thickness of the break plate 102, the cutting edge angle θ, etc., but for example, from alumina. In the case of the ceramic molded body 1, if the thickness is set to 1/3 or more of the thickness, the ceramic molded body 1 can be divided. Further, since the division can be performed without excessive pushing, it is sufficient that the pushing amount is set to 9/10 or less, preferably 2/3 or less. If the pushing amount is set to a value larger than that, even if there should be no problem in the setting, the break plate 102 and the elastic body 101 may actually come into contact with each other and the elastic body 101 may be damaged. Therefore, it is not preferable.

When the ceramic molded body 1 is placed on a rigid stage instead of the elastic body 101 and divided by the break plate 102 as in the conventional method, the ceramic molded body 1 does not bend or the stage is not deformed. Unlike the above-mentioned case, a vertically upward force acts only on the ceramic molded body 1 from the stage. Therefore, the torque T as shown in FIG. 3 is not preferably generated, and the crack CR that is generated in the present embodiment is not extended.

At the time of break processing, one main surface of the ceramic molded body 1 is attached to a fixing member such as a dicing tape stretched on a dicing ring (not shown) for the purpose of preventing movement and scattering of individual pieces after division. In such a case, the fixing member may be placed and fixed in such a manner that the fixing member is brought into contact with the elastic body 101. Since such a fixing member is usually sufficiently thinner than the elastic body 101 and has elasticity or flexibility, it can be regarded as an integral body with the elastic body 101.

As described above, according to the present embodiment, the ceramic molded body is suitably divided by bringing the break plate into contact with the planned division position in a state of being horizontally placed on the elastic body and further pushing it down. Can be done.

When the ceramic molded body 1 was to be divided by using the break device 100, the influence of the magnitude of the pushing amount on whether or not the ceramic molded body 1 could be divided was evaluated.

As the ceramic molded body 1, an alumina ceramic molded body of 200 mm square and 0.8 mm thick before firing was used, and this was cut into 10 mm square.

As the elastic body, rubber having a thickness of 3 mm was used. As the break plate 102, a stainless steel plate having a thickness of 0.4 mm, a length of 300 mm, a height of 22 mm, and a cutting edge angle θ of 15 ° was used. The descending speed of the break plate 102 was 100 mm / s.

The amount of pushing is different from 10 levels of 0.04 mm, 0.08 mm, 0.12 mm, 0.16 mm, 0.20 mm, 0.30 mm, 0.40 mm, 0.50 mm, 0.60 mm, and 0.70 mm ( Condition Nos. 1 to 10), the division was attempted by the break processing at each pushing amount.

Table 1 shows a list of the pushing amount of each condition, the possibility of division by the break process, and the state of the molded product after the break process.

As shown in Table 1, No. 1 in which the pushing amount is less than 0.1 mm. 1 and No. Under the condition of 2, no division was made, and the formation of a notch indicating that the break plate 102 had entered the inside after the break plate 102 abuted on the alumina ceramic molded body was not confirmed. Such a result indicates that when the pushing amount is small, the pushing down after the break plate 102 comes into contact with the ceramic molded body 1 is absorbed by the elasticity of the elastic body 101.

In addition, No. 1 in which the pushing amount exceeds 0.1 mm and is less than 1/3 of the thickness of the alumina ceramic molded product. 3 to No. Under the condition of 5, although a cut was formed in the alumina ceramic molded product, the alumina ceramic molded product was not divided. As a result, when the pushing amount is less than 1/3 of the thickness of the ceramic molded body 1, the break plate 102 enters the ceramic molded body 1, but even if the crack CR is extended due to this, the lower end in the thickness direction It points out that it does not reach the department.

On the other hand, the pushing amount is 1/3 or more of the thickness of the alumina ceramic molded body, which is smaller than the thickness of the alumina ceramic molded body. 6 to No. Under the condition of 10, the alumina ceramic molded product was divided by the break treatment. Moreover, the partial cross section was smooth. The result indicates that by setting the pushing amount to 1/3 or more of the thickness of the ceramic molded body 1, the ceramic molded body 1 can be suitably divided without pushing down the break plate 102 to the lowermost end in the thickness direction. There is.

1 Ceramic molded body 100 Break device 101 Elastic body 102 Break plate 102e Cutting edge CR Crack P Scheduled division position SL slit

Claims (4)

A method of dividing a ceramic molded body formed by mixing a predetermined ceramic powder with an organic material into a plate shape in the thickness direction along a predetermined planned division position.
A mounting step of horizontally mounting the ceramic molded body on an elastic body, and
A break plate is brought into contact with the planned division position of the ceramic molded body placed on the elastic body from the upper surface side, and the break plate is further placed at 1/3 or more and 9/10 or less of the thickness of the ceramic molded body. By pushing in with a predetermined pushing amount, a cut is formed in the ceramic molded body at the planned division position, and a crack is further extended from the lower end of the cut in the thickness direction of the ceramic molded body to form the ceramic. A break step of dividing the molded product at the planned division position and
A method for dividing a ceramic molded product, which comprises the above. The method for dividing a ceramic molded product according to claim 1.
The cutting edge angle of the break plate is 5 ° to 25 °.
A method for dividing a ceramic molded product, which is characterized in that. The method for dividing a ceramic molded product according to claim 1 or 2.
The elastic body is rubber having a hardness of 60 ° to 90 °.
A method for dividing a ceramic molded product, which is characterized in that. The method for dividing a ceramic molded product according to any one of claims 1 to 3.
In the above-described placement step, the ceramic molded body is attached and fixed to a predetermined fixing member, and then placed on the elastic body in a manner in which the fixing member is brought into contact with the elastic body.
A method for dividing a ceramic molded product, which is characterized in that.

Images