JPH08206999A - Dividing method of plate-like hard fragile material - Google Patents

Abstract

PURPOSE: To provide a dividing method of a plate-like hard fragile material by which the plate-like hard fragile material can be efficiently divided by a simple means when it is divided into a prescribed dimension. CONSTITUTION: Streaks 11-y to be predivided are arranged at least on one surface of a plate-like hard fragile material 11, and when the plate-like hard fragile material 11 is divided in a paper strip shape by sandwiching and pressurizing the plate-like hard fragile material 11 by a lower mold 13 having a recessed curved surface 13a and an upper mold 14a having a projecting curved surface 14a, it can be efficiently divided by an easy method.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate-shaped hard and brittle material such as a chip resistor made of ceramic which is arranged on a printed circuit board and used for electric circuit construction. The present invention relates to a method of dividing a plate-like hard and brittle material used.

[0002]

2. Description of the Related Art A conventional method for dividing a plate-like hard and brittle material of this type will be described with reference to the drawings.

FIG. 14 is a plan view showing an alumina sheet for chip resistors coated with electrodes.
Striation marks 81 for dividing in the X direction according to the final element size
-X and a striation 81 for dividing in the Y direction which is almost orthogonal to it
-Y is previously provided on the surface.

In this type of division, first, division in the Y direction is performed to form strip-shaped division pieces, electrodes are formed on the cut surfaces on both sides thereof, and then division in the X direction is performed to divide the final piece. The first division in the Y direction is called primary division, and the next division in the X direction is called secondary division.

FIG. 15 is a side view showing a primary dividing method of a conventional alumina sheet for chip resistors. In FIG. 15, 81 is an alumina sheet, 81-y is a striation in the Y direction, and 82.
Is a lower mold for placing an alumina sheet, 83 is an upper mold for sandwiching the alumina sheet, 84 is a rotor for applying a bending moment to the alumina sheet 81, and 84a is a rotor claw integrally formed at the tip of the rotor 84. .

Next, a conventional method for dividing a plate-like hard and brittle material having such a structure will be described.

Alumina sheet 81 is closest to the end face Y
It is placed on the upper surface of the lower mold 82 so as to protrude by a dimension corresponding to the distance between the scratches in the direction, and is sandwiched by the upper mold 83 and the lower mold 82. By rotating the rotor 84 in the direction of arrow A in the figure, the rotor claws 84a give a bending moment to the alumina sheet 81, and the alumina sheet 81 becomes a streak 81-in the Y direction.
It is cut from y and divided. Alumina sheet 81
Was carried out in the direction of arrow B in the drawing, and the same operation was performed to perform sequential division.

[0008]

However, in the above-described conventional method for dividing a plate-like hard and brittle material, since the division is performed in order from the edge of the sheet, the first and last strip-shaped divided pieces are cracked after the division. There was a problem that quality was uneven and workability was poor.

SUMMARY OF THE INVENTION The present invention is intended to solve such a conventional problem, and an object thereof is to provide a method of dividing a plate-like hard and brittle material having a simple structure, a small number of steps, and a low equipment cost and product cost. To do.

[0010]

In order to solve the above-mentioned problems, a method of dividing a plate-like hard and brittle material of the present invention is such that at least one surface of the plate-like hard and brittle material is preliminarily provided with a striation for division, and an arc shape is formed. Of the lower mold having a concave curved surface having a concave R surface, and an upper mold having a convex curved surface having a convex lower surface having an R surface substantially equal to the concave curved surface, and a plate provided with the above-mentioned striations. The plate-like hard and brittle material is sandwiched and pressed to divide the plate-like hard and brittle material into strips in one direction.

[0011]

By this method, the convex curved surface of the upper die to be pressed always comes into contact with almost the center line of the plate-like hard and brittle material, so that it is divided from the center line. Since the convex curved surface hits almost the center line and is divided up to the last streak in order, it is possible to always divide in a state of left and right from the center, so the crack quality after division Can be stabilized and the structure of the equipment required for this division can be simplified.

[0012]

【Example】

(Embodiment 1) Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a plan view showing a plate-like hard and brittle material in the same embodiment. In FIG. 1, 11 is a plate-like hard and brittle material.
1-y indicates a striation for division in the Y direction.

FIG. 2 is a perspective view showing a method of dividing a plate-like hard and brittle material according to the same embodiment. In FIG. 2, reference numeral 13 is a concave R surface 13a having an arcuate R surface formed in a concave shape. A pressure plate lower mold, 14 is a pressure plate upper mold having a convex R surface 14a on the lower surface, similarly having an arcuate R surface convexly formed, and the radius of the concave R surface 13a and the radius of the convex R surface 14a are They are formed almost the same.

3 (a) to 3 (d) are side views showing the process of the method for dividing a plate-like hard and brittle material according to the same embodiment.

Next, an actual dividing method will be described.
First, as shown in FIG. 2, the plate-like hard brittle material 11 is formed into a plate shape so that the scratches 11-y in the Y direction face the concave R surface 13a and are parallel to the longitudinal direction of the pressure plate lower mold 13. The hard and brittle material 11 is placed on the lower pressure plate mold 13. Next, the pressure plate upper mold 14 is pressed in the direction of arrow A in the figure so that the convex R surface 14a and the concave R surface 13a face each other. As shown in FIG. 3 (a), the convex R surface 14a of the pressing plate upper mold 14 is substantially in contact with the center line of the plate-like hard and brittle material 11, and the pressing force is increased in the direction of arrow A in FIG. As shown in b), it is cut at almost the center and divided. By further increasing the pressing force in the direction of the arrow A, as shown in FIG. 3 (c), the divided pieces are cut at substantially the center and divided, and further pressurized to show in FIG. 3 (d). Concave surface 13a
It is divided into individual pieces along the line up to the last streak.

As described above, the method of dividing the plate-like hard and brittle material 11 according to the present embodiment can not only divide the plate-like hard and brittle material 11 in a state where the plate hard and brittle material is always even from the center.
The quality of cracks after the division can be stabilized, and the structure of equipment required for the division can be simplified.

(Second Embodiment) A second embodiment of the present invention will be described below with reference to the drawings.

4 (a) to 4 (c) are plan views showing an alumina sheet for a chip resistor coated with electrodes in the same embodiment, FIG. 4 (a) is a plan view and FIG. 4 (b) is a side view. Fig. 4 (c) shows a bottom view, in which 21 is an alumina sheet, 21-x1 is a ridge in the X direction for dividing the front surface, 21-x2 is a ridge on the back surface, 21-y1. Is a stripe in the Y direction for dividing the surface, 21-y2 is a stripe on the back surface, 22a is a silver electrode on the front surface, 22b is a silver electrode on the back surface, 2
3 shows resistance printing and glass coating.

5 (a) to 5 (d) are side views showing the process of the primary division of the electrode coated alumina sheet for chip resistors. In FIG. 5, 24 is the same as that of the above embodiment. A pressure plate lower mold and 25 are pressure plate upper molds.

Next, an actual dividing method will be described.
First, as shown in FIG. 5A, the concave R of the pressure plate lower mold 24 is formed.
The surface 24a faces the printing of the alumina sheet 21 and the glass coat 23, and the stripes 21- in the Y direction for dividing the surface.
Arranged so that y1 is parallel to the longitudinal direction of the lower pressure plate mold 24, and pressurizing in the direction of arrow A in the figure so that the convex R surface 25a of the upper pressure plate mold 25 faces the concave R surface 24a. As a result, the divided cutting is performed along the concave R surface 24a as shown in FIG. However, at this time, the silver electrode 22a on the surface covering the upper surface of the Y-direction striations 21-y1 for dividing the front surface is cut along the striations, but the rear-side dividing striations 21 for y-direction 21-y1 are cut. Since the silver electrode 22b on the back surface covering the upper surface of -y2 is not cut, the alumina sheet 21 is inverted and pressed in the same manner as shown in FIG. Silver electrode 2 on the back as shown
2b is cut and division is performed.

As described above, the primary division of the electrode coated alumina sheet 21 for chip resistors according to this embodiment is as follows.
It can be done completely accurately including the silver electrodes on both sides,
The configuration of the equipment required for this division can be simplified.

(Embodiment 3) A third embodiment of the present invention will be described below with reference to the drawings.

6 (a) to 6 (d) are side views showing the process of primary division of the electrode-coated alumina sheet for chip resistors in the same embodiment, in which 31 is an alumina sheet, 31-y1. Is a scratch in the Y direction for dividing the surface, 33 is resistance printing and glass coating, 34 is a radius R
A pressure plate lower die having a concave R surface 34a having A, a pressure plate upper die 35 having a convex R surface 35a having a radius RA,
Reference numeral 36 denotes a pressure plate lower die having a concave R surface 36a having a radius RB, and 37 denotes a pressure plate upper die having a convex R surface 37a having a radius RB.

Next, an actual dividing method will be described.
First, as shown in FIG. 6A, the concave R of the pressure plate lower mold 34 is formed.
The Y-direction striations 31-for printing the alumina sheet 31 and the glass coat 33 face the surface 34a and dividing the surface.
It is arranged so that y1 is parallel to the longitudinal direction of the pressure plate lower mold 34, and the convex R surface 35a of the pressure plate upper mold 35 faces the concave R surface 34a in the direction of arrow A in the figure. By pressurizing with a force, the divided cutting is performed along the concave R surface as shown in FIG. Next, as shown in FIG. 6C, the alumina sheet 31 is inverted, and then the pressure plate lower die 36 having a radius RB smaller than the radius RA of the pressure plate lower die 34 at the time of the first press is inverted. And place it. Further, the convex R surface 37a of the pressure plate upper die 37 and the concave R surface 36a of the pressure plate lower die 36 are pressed by the force P2 in the direction of arrow A in the drawing. At this time, P2 can be pressed with a relatively weaker force than P1.

As described above, the primary division of the alumina sheet 31 for chip resistors coated with electrodes according to this embodiment is as follows.
It can be done completely accurately including the silver electrodes on both sides,
The configuration of the equipment required for this division can be simplified.

(Embodiment 4) A fourth embodiment of the present invention will be described below with reference to the drawings.

FIG. 7 is a plan view of the rectangular plate-shaped hard and brittle material in the same embodiment, in which 41 is a rectangular plate-shaped hard and brittle material sheet, 41-x is a striation in the X direction for dividing the surface, 41
-Y indicates a Y-direction striation for dividing the surface, and the element size after the division is X-axis size> Y-axis size.

FIG. 8 is a perspective view showing a method of dividing the rectangular plate-like hard and brittle material sheet 41 shown in FIG. 7, in which 44 is a concave R surface 44RB in the X-axis direction, and 44 is a Y-axis direction. A pressure plate lower die having a concave R surface 44RA and a pressure plate upper die 45 having a convex R surface 45RB in the X-axis direction and a convex R surface 45RA in the Y-axis direction.

Next, an actual dividing method will be described.
First, as shown in FIG. 8, the surface of the rectangular plate-shaped hard and brittle material sheet 41 with the striations is faced to the pressing plate lower die 44, and the X-axis and Y-axis directions of the rectangular plate-shaped hard and brittle material sheet 41 and the pressing plate. The lower mold 44 is arranged so that the X-axis and Y-axis directions are substantially the same. Next, the convex R surface 45RB of the pressure plate upper die 45 is pressed by the pressure plate lower die 4
The rectangular plate-shaped hard and brittle material sheet 41 is collectively divided by arranging so as to face the concave R surface 44RB of No. 4 and pressing the pressing plate upper die 45 in the direction of arrow A in the drawing.

As described above, the rectangular plate-shaped hard and brittle material sheet 41 according to the present embodiment can be accurately divided in one step even if the element shape is rectangular. The configuration can also be simplified.

(Fifth Embodiment) A fifth embodiment of the present invention will be described below with reference to the drawings.

FIG. 9 is a plan view of a rectangular plate-shaped hard and brittle material in the same embodiment, in which 51 is a rectangular plate-shaped hard and brittle material sheet, 51-x is a striation in the X direction for dividing the surface, 51
-Y indicates a Y-direction striation for dividing the surface, the element size after division is X-axis dimension> Y-axis dimension, and the ratio is formed as X-axis: Y-axis = b: a. There is.

FIG. 10 is a perspective view showing a method of dividing the rectangular plate-like hard and brittle material sheet 51 shown in FIG. 9, in which 54 is a concave R surface 54RB in the X-axis direction and Y-axis direction. A pressure plate lower mold having a concave R surface 54RA, 55 is a pressure plate upper mold having a convex R surface 55RB in the X-axis direction and a convex R surface 55RA in the Y-axis direction. The dimensional ratio of the shape R surface is X axis: Y axis = RB: RA, and the element size of the rectangular plate-like hard and brittle material sheet 51 and RB: RA = b: a.

Next, an actual dividing method will be described.
First, as shown in FIG. 10, a rectangular plate-like hard and brittle material sheet 51
Of the rectangular plate-shaped hard and brittle material sheet 51 in the X-axis and Y-axis directions and the pressure plate lower mold 54.
The X-axis direction and the Y-axis direction are substantially aligned with each other.
Next, the convex R surface 55RB of the pressing plate upper die 55 is arranged so as to face the concave R surface 54RB of the pressing plate lower die 54, and the pressing plate upper die 55 is pressed in the direction of arrow A in the drawing. The rectangular plate-like hard and brittle material sheet 51 is collectively divided.

As described above, since the rectangular plate-shaped hard and brittle material sheet 51 according to the present embodiment is divided at one time by the spherical surface corresponding to the rectangular dimension of the element, the rectangular plate-shaped hard and brittle material sheet 51 is collectively divided. The division can be performed more accurately in one step, and the configuration of equipment required for this division can be simplified.

(Embodiment 6) A sixth embodiment of the present invention will be described below with reference to the drawings.

11 (a) to 11 (c) are perspective views showing a process of dividing the plate-like hard and brittle material in the same embodiment, in which 61 is a plate-like hard and brittle material sheet and 61-x is a surface. X-direction striations for the division of No. 61-y are Y for the division of the surface
Stripes in the direction, 62 is an adhesive tape, 64 is a pressure plate lower mold, 65 is a pressure plate upper mold, arrow A is a compression direction of the pressure plate upper mold 65, arrow B is a tape 62 feeding direction, arrow C Indicates the direction of decompressing the pressure plate upper mold 65.

Next, an actual dividing method will be described.
First, as shown in FIG. 11A, the plate-like hard and brittle material sheet 6
1 for dividing X-direction striations 61-x and Y-direction striations 6
Adhesive tape 6 so that the side with 1-y is the surface 6
Stick on 2. Next, the plate-like hard and brittle material sheet 61 attached to the adhesive tape 62 is set on the pressure plate lower mold 64 as shown in FIGS.
Dividing is performed by compressing in the direction of arrow A in the figure with the press plate upper die 65. Next, the pressure plate upper die 65 is decompressed in the direction of the arrow C in the drawing, the adhesive tape 62 is fed in the direction of the arrow B in the drawing, and the next plate-shaped hard and brittle material sheet 61 is processed. It is something to do.

As described above, the division of the plate-like hard and brittle material sheet 61 according to this embodiment can be continuously processed because the plate-like hard and brittle material sheet 61 is fixed to the adhesive tape 62. After processing, the elements do not come apart and can be easily handled, and the production efficiency can be improved.

(Embodiment 7) Hereinafter, a seventh embodiment of the present invention will be described with reference to the drawings.

12A to 12C and FIG.
(A), (b) is a perspective view which shows the process of division | segmentation of the plate-shaped hard-brittle material in the Example, 71 is a plate-shaped hard-brittle material sheet, 71-x is X for surface division. Direction striations, 71-y is a Y-direction striation for dividing the surface, 72 is an adhesive tape, 74 is a pressure plate lower die, 75 is a pressure plate upper die, and arrow A is a pressure plate upper die 75 Compression direction, 73a-7
3d is an expander for pulling the tape 72 in the outer peripheral direction (arrow direction in the figure), 71-xa and 71-ya are gaps generated by division, and arrow B is the direction for decompressing the pressure plate upper die 75.

Next, an actual dividing method will be described.
First, as shown in FIG. 12A, the plate-like hard and brittle material sheet 7
1 for dividing X-direction striations 71-x and Y-direction striations 7
The tape 1 having the 1-y surface is attached to the adhesive tape 72 so that the surface is the surface. Next, FIGS. 12B to 12C
The plate-like hard and brittle material sheet 71 adhered on the adhesive tape 72 is set on the pressure plate lower mold 74 and compressed by the pressure plate upper mold 75 in the direction of arrow A in the figure. Go and split. Next, as shown in FIG. 13A, the plate-like hard and brittle material sheet is pulled by using the expanders 73a to 73d in the outer peripheral direction so as to be substantially perpendicular to the respective scratches of the plate-like hard and brittle material sheet 71. 71 divisions are performed.
Next, as shown in FIG. 13B, the expander 73a
~ 73d pulling, in the direction of the arrow B in the figure
It is maintained even after decompressing No. 5, and the gaps 71-xa and 7
The division work is completed while maintaining the state in which 1-ya is secured.

As described above, in the division of the plate-like hard and brittle material sheet 71 according to the present embodiment, the gap between the elements, which has been generated at the time of division by compression, disappears at the time of decompression, and the divided elements are separated from each other. Can solve the problem of causing chipping by buffering, and the gap between each element generated at the time of division is pulled by the expanders 73a to 73d to secure the gap, and the quality at the time of division is dramatically improved. It can be done.

[0045]

As is apparent from the above, the present invention provides a concave R-face and a convex R-face with a plate-shaped hard and brittle material, for example, an alumina sheet for a chip resistor or the like, on which one or both surfaces are preliminarily provided with splitting marks. It is possible to accurately perform the primary division of the alumina sheet for the chip resistor by a simple method of sandwiching and pressing with a pair of pressure plates having the R surface.

[Brief description of drawings]

FIG. 1 is a plan view showing a plate-like hard and brittle material according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a method of dividing a plate-like hard and brittle material according to the same embodiment.

FIG. 3 is a side view showing a dividing process according to the embodiment.

FIG. 4A is a plan view showing an alumina sheet for chip resistors in a second embodiment of the present invention. FIG. 4B is a front view of the same and FIG. 4C is a bottom view of the same.

FIG. 5 is a side view showing a process of primary division of the alumina sheet for chip resistors in the example.

FIG. 6 is a side view showing the process of primary division of the alumina sheet for chip resistors in the third embodiment of the present invention.

FIG. 7 is a plan view showing a rectangular plate-like hard and brittle material according to a fourth embodiment of the present invention.

FIG. 8 is a perspective view showing a method for dividing a rectangular plate-like hard and brittle material according to the same embodiment.

FIG. 9 is a plan view showing a rectangular plate-like hard and brittle material according to a fifth embodiment of the present invention.

FIG. 10 is a perspective view showing a method of dividing a rectangular plate-like hard and brittle material according to the same embodiment.

FIG. 11 is a perspective view showing a dividing process of a plate-like hard and brittle material according to a sixth embodiment of the present invention.

FIG. 12 is a perspective view showing a dividing process of a plate-like hard and brittle material according to a seventh embodiment of the present invention.

FIG. 13 is a perspective view showing a dividing process of a plate-like hard and brittle material according to the example.

FIG. 14 is a plan view showing a conventional alumina sheet for chip resistors.

FIG. 15 is a side view showing a conventional primary dividing method for an alumina sheet for chip resistors.

[Explanation of symbols]

 11 plate-like hard brittle material 11-y Y-direction striations 13 lower die 13a concave curved surface 14 upper die 14a convex curved surface 21 alumina sheet 21-x1 surface X-directional striations 21-x2 rear surface X-directional striations Scratches 21-y1 Scratches in the Y direction on the surface 21-y2 Scratches in the Y direction on the back surface 22a Silver electrodes on the front surface 22b Silver electrodes on the back surface 23 Resistance printing and glass coat 24 Lower mold 24a Concave curved surface 25 Upper mold 25a Convex Curved surface 31 Alumina sheet 31-y1 Y-direction striations on the surface 33 Resistive printing and glass coating 34 Lower mold 34a Concave curved surface 35 Upper mold 35a Convex curved surface 36 Lower mold 36a Concave curved surface 37 Upper mold 37a Convex curved surface 41 Rectangle Plate-shaped hard-brittle material sheet 41-x Strokes in X direction 41-y Y-direction striations 44 Lower die 44RA Concave curved surface 44RB Concave curved surface 45 Upper die 45RA Convex curved surface 45R Convex curved surface 51 Rectangular plate-like hard and brittle material sheet 51-x X-direction striations 51-y Y-direction striations 54 Lower mold 54RA Concave curved surface 54RB Concave curved surface 55 Upper mold 55RA Convex curved surface 55RB Convex curved surface 61 Plate-like hard and brittle material sheet 61-x X-direction striations 61-y Y-direction striations 62 Adhesive tape 64 Lower mold 65 Upper mold 71 Plate-like hard and brittle material sheet 71-x X-direction striations 71 -Xa gap between elements in X direction 71-y striation in Y direction 71-ya gap between elements in Y direction 72 adhesive tape 73a expander 73b expander 73c expander 73d expander 74 lower mold 75 upper mold

Claims (9)

[Claims] 1. A lower mold having a concave curved surface on the upper surface of which a ridge for division is previously provided on at least one surface of a plate-like hard and brittle material, and an arcuate R surface is formed in a concave shape, and the concave curved surface. By sandwiching and pressing the plate-like hard and brittle material provided with the above-mentioned scratches with an upper die having a convex curved surface in which a substantially equal R surface is convexly formed on the lower surface, the plate-like hard and brittle material is strip-shaped. A method of dividing a plate-like hard and brittle material into one direction. 2. The method for dividing a plate-like hard and brittle material according to claim 1, wherein the plate-like hard and brittle material is an alumina sheet for a chip resistor. 3. A plate-resisting brittle material is used as an electrode-coated alumina sheet for chip resistors, the chip resistor alumina sheet is sandwiched between an upper mold and a lower mold, pressed, and then turned upside down, and again the same mold is formed. The method for dividing a plate-like hard and brittle material according to claim 1, wherein the plate-like hard and brittle material is divided by being sandwiched by a lower mold and pressurized. 4. The convex curved surface and the concave surface provided on the upper and lower molds used for the second pressing, respectively, in contrast to the convex curved surface and the concave curved surface formed on the upper and lower molds used for the first pressing, respectively. The method for dividing a plate-like hard and brittle material according to claim 3, wherein R forming the curved surface is constituted by a radius having a small dimension. 5. An arcuate R surface of different size is orthogonally crossed to each of a concave curved surface in which an arcuate R surface is formed in a concave shape and a convex curved surface in which an arcuate R surface is formed in a convex shape. The method for dividing a plate-shaped hard and brittle material according to claim 1, wherein the plate-shaped hard and brittle material is divided into individual pieces in the XY direction by providing concave composite curved surfaces and convex composite curved surfaces. 6. A ratio of two arc-shaped R surfaces of different sizes forming a concave compound curved surface and a convex compound curved surface, respectively, is defined as a ratio of a long side and a short side of a rectangular element to be divided. 5. The method for dividing a plate-like hard and brittle material according to 5. 7. The method of dividing a plate-like hard and brittle material according to claim 6, wherein the plate-like hard and brittle material is an alumina sheet for a chip resistor composed of rectangular elements. 8. A plate-like hard and brittle material having at least one surface in which a ridge for division is previously provided is attached to an adhesive tape or the like, which is a vertical mold having a concave curved surface and a convex curved surface, respectively. Alternatively, a method of dividing a plate-like hard and brittle material, in which the plate-like hard and brittle material is divided by sandwiching and pressing by upper and lower dies having a flat surface portion. 9. The plate-like hard-brittle material according to claim 8, wherein a tape or the like having adhesiveness is expanded in the outer peripheral direction of the plate-like hard-brittle material immediately before or substantially simultaneously with releasing the pressure applied to the upper and lower molds. Split method.