JP2007083350A - Cutting blade - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a cutting pressure of the cutting blade effected on an object to be cut by improving a blade edge part shape of the cutting blade, to thereby improve productivity and defect rate by surely preventing cracks from occurring in cutting. <P>SOLUTION: In the cutting blade forming the blade edge part in a wave shape where a smooth projection blade and a recessed blade are continued, the blade edge part 10 is formed to be such a wave shape that the high projection blade 11a and the low projection blade 11b having a vertical interval at the blade edge position, and the recessed blade 12 having a constant depth interposed between them, are continued. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a cutting blade, and more particularly to a cutting blade used for cutting an object to be cut such as a ceramic green sheet or a laminate thereof, in particular, while being given a slight horizontal vibration simultaneously with a descending operation. The present invention relates to a cutting blade suitable for performing a cutting operation.

Conventionally, a ceramic green sheet or a laminate thereof is cut into a lattice by a cutting device having a flat blade-like cutting blade in a manufacturing process of an inductor, a capacitor, an integrated circuit package, and the like to produce a chip (cerachip). However, a cutting device disclosed in Japanese Patent Application Laid-Open No. 6-8195 (Patent Document 1) is known as a conventional device that imparts a slight lateral vibration to the cutting blade during the cutting operation.
Patent Document 1 discloses a cutting device for cutting a multilayer ceramic capacitor multilayer body into chips, in which a vibration block 3 is disposed in a cutter holder 2 sandwiching a cutting blade 1, and a piezoelectric actuator 6 is disposed in the vibration block 3. Are arranged so as to be in pressure contact with each other, and a transverse vibration is applied to the cutting blade 1 via the vibration block 3 and the cutter holder 2 by the piezoelectric actuator 6 at the time of cutting.
As an example of the cutting blade, a cutting blade 1 having a thickness of about 0.2 mm mounted on the cutter holder 2 is described, and a voltage is applied to the cutting blade 1 by applying a voltage from an AC power source to the piezoelectric actuator 6. (The reference numerals are the same as those in the same document). Although the specific shape of the blade edge portion of the cutting blade 1 is not disclosed, a straight blade having a straight edge with the same edge is generally adopted as this type of cutting blade.

On the other hand, as cutting blades in general, various types of blades with deformations on the cutting edge are known.
For example, Japanese Patent Application Laid-Open No. 11-179095 (Patent No. 11-1779095) in which the cutting edge of an electric kitchen knife that cuts and reciprocates food such as bread and meat has an uneven blade, specifically, a convex blade is a triangular blade or a sharp blade. Reference 2), or a cutting tool for cutting a thin flexible material such as a synthetic resin film raw material, and the edge of the blade is corrugated and the tips of the blade-shaped protrusions are aligned almost linearly. Patent Document 3).

JP-A-6-8195 Japanese Patent Laid-Open No. 11-179095 (in particular, refer to FIG. 4) Japanese Utility Model Publication No. 60-22295 (refer to FIG. 4 in particular)

However, in recent cutting of ceramic green sheets, the laminate has become a material with high cutting resistance due to the improvement of the composition of the green sheets, and the chip size is reduced, that is, the vertical and horizontal dimensions are 0.6 mm × 0.3 mm. Further, along with the demand for cutting a very small chip of 0.4 mm × 0.2 mm, the cutting blade is made extremely thin, for example, the maximum blade thickness of the blade edge portion is about 25 μm to 50 μm (the thickness of the shank portion is It is necessary to use a cutting blade of about 0.4 mm to 1 mm).
Therefore, the straight blade as in Patent Document 1, the triangular blade or the sharp blade described in Patent Document 2, or the simple corrugated cutting blade (wave blade) described in Patent Document 3 has a desired cutting performance. There was a defect that could not be secured.
In other words, when a straight blade is used, the side slip of the blade portion is large due to lateral vibration and a predetermined cutting force cannot be obtained, and it is easy to wear and durability is not obtained. To increase the cutting force, the longitudinal feed is increased. If it does, it will become a cause of crack generation, and a sharp blade such as a triangular blade as in Patent Document 2 is likely to generate a crack due to a local cutting pressure due to the cutting angle.

In that respect, if a corrugated cutting blade (corrugated blade) as in Patent Document 3 is used, local cutting pressure is not applied, so that the occurrence of cracks can be suppressed to some extent.
However, in the case of cutting the ceramic green sheet as an example, a small chip is obtained by repeating a number of cutting operations (full cut or half cut) on one sheet, thereby cutting the sheet into a lattice shape. Is taken and then fired. For this reason, chip cracking due to the occurrence of cracks in the cutting process greatly affects the yield, but if the cracks flow laterally as the chips are miniaturized as described above, chip dimensional defects and performance defects occur. Therefore, in order to ensure a high yield, it is required to reliably prevent the occurrence of cracks during cutting.

  In view of the above-described conventional circumstances, the present invention reduces the cutting pressure exerted on a cutting object (hereinafter referred to as a workpiece) by the cutting blade by improving the shape of the cutting edge portion of the cutting blade, and thereby at the time of cutting. An object is to reliably prevent the occurrence of cracks to increase yield and improve productivity.

The cutting blade for solving the problem of the present invention is a cutting blade in which the cutting edge portion is formed in a wave shape in which a smooth convex blade and a concave blade are continuous, and the cutting edge portion has a high difference in height at the cutting edge position. It is a waveform which continued with the convex blade and the low convex blade, and the concave blade of constant depth interposed between them (Claim 1).
In that case, the shape of the smooth convex blade and the concave blade is preferably a sine curve, and the fine means that the pitch between the convex blades and the concave blade is the same, and the pitch between the convex blades is about 1 mm or less, For example, it is about 0.5 mm, and the height of the high convex blade (height from the bottom of the concave blade to the top of the high convex blade) is about 30 to 60 μm, for example, about 50 μm. Further, the blade height of the low convex blade is about ½ of the blade height of the high convex blade. For example, when the blade height of the high convex blade is 50 μm in the above example, the low convex blade is 25 μm.
According to this, in the cutting operation of moving the cutting blade in the lateral direction, the cutting force increases by the convex blade biting into the workpiece with the combined vector with the vertical feed direction, so the cutting edge of the cutting edge portion due to side slip such as a straight blade is increased. Less wear, and the convex and concave blades have a fine and smooth waveform, so there is no local cutting pressure due to the cutting angle like a saw blade (triangular blade), and cracks are generated during cutting In addition to being suppressed, the cutting pressure exerted on the workpiece at the time of cutting is dispersed by the high and low two-stage convex blades, so that the generation of cracks is more reliably prevented.

Further, as a more preferable form of the blade edge portion, the cross-sectional thickness of the low convex blade is made smaller than the cross-sectional thickness of the high convex blade (Claim 2). In many cases, this form is inevitably obtained at the stage of forming the cutting edge, but if this is not the case, it may be produced by adding this forming step.
According to this, the convex blade part which contacts the cutting | disconnection side surface of a workpiece | work can be reduced, and adhesiveness with the workpiece | work as the whole cutting blade can be reduced.
And as a preferable form of use of the cutting blade, the cutting edge object is subjected to the cutting object while being given a vertical feed and a fine vibration in the horizontal direction with respect to the cutting object placed on the plane. Cutting, specifically, mounting on a cutting device for use (Claim 3), in which case a suitable cutting object is exemplified by an electronic component such as a ceramic green sheet or a laminate thereof. It is a flexible material or a brittle material (Claims 4 and 5).
In the present invention, cutting includes both full cut and half cut.

According to the present invention, by improving the cutting edge portion of the cutting blade, it is possible to reliably prevent the occurrence of cracks in the workpiece at the time of cutting, and to provide a cutting blade capable of significantly increasing the yield and improving the productivity. (Claim 1).
According to the second aspect of the present invention, the adhesiveness can be reduced by reducing the cutting contact surface between the blade edge part and the workpiece, so that the cutting property can be improved even with a highly flexible and adhesive workpiece.
And according to Claims 3-5, by attaching to the cutting device which cut | disconnects electronic components, such as a ceramic green sheet and its laminated body, it can add to one of the useful accessory parts which raise the productivity of the device. it can.

The embodiment of the present invention will be described with reference to the drawings. FIG. 1 and FIG. 2 show a cutting blade 1 and a case where the ceramic green sheet laminate is mounted and used in a cutting apparatus for cutting as a workpiece W will be described.
In FIG. 1, a cutting blade 1 is detachably attached to a cutter holder 2, and the cutter holder 2 is connected to a vertical axis feed mechanism 3 and is associated with a lateral vibration drive mechanism 4 and moved up and down by the vertical axis feed mechanism 3. In this lowering operation, the lateral vibration drive mechanism 4 applies a fine vibration at a high speed in the lateral direction to the cutting blade 1.
The vertical axis feed mechanism 3 has a well-known structure and will not be described in detail. For example, a cutter ram is attached to a lifting shaft driven by a servo motor, and the cutter holder 2 is attached to the cutter ram. 1 can be moved up and down by a predetermined vertical feed amount.
For example, as disclosed in Patent Document 1, the lateral vibration drive mechanism 4 is provided with a vibration block in the cutter holder 2 and applies a lateral vibration to the cutting blade 1 by driving a piezoelectric actuator to the vibration block. As disclosed in the cutting device according to the present invention or the previous application of the present applicant, a laminated piezoelectric element is built in the cutter holder 2 and lateral vibration is applied to the cutting blade 1 by driving the piezoelectric element. There is no particular limitation as long as it gives a fine vibration in the lateral direction to the cutting blade 1.

  An example of the cutting operation by the cutting blade 1 will be described. The cutting blade 1 moves down together with the cutter holder 2 at a fixed amount or a variable feed amount set in the vertical axis feeding mechanism 3 and is supported on the base plate 5. The cutting blade 1 is vibrated at high speed with a set amplitude of several μm to several tens of μm in the lateral direction by the operation of the lateral vibration drive mechanism 4 at the timing of contact with the workpiece W. Cutting operation in cooperation with After the one operation is finished, when the cutter holder 2 is raised, the cutting blade 1 or the workpiece W is moved to a fixed size, and then the cutting blade 1 is lowered again together with the cutter holder 2 to perform the cutting operation. Is repeated until the end of the workpiece feed direction, and then the workpiece 5 is cut into a grid by repeating the same cutting operation as described above in a state where the platform 5 is rotated and the workpiece W is turned 90 degrees. A minute chip (for example, vertical and horizontal dimensions 0.4 mm × 0.2 mm) is manufactured.

  The external shape of the cutting blade 1 is as shown in FIG. 1 and FIG. 2, and specific dimensions are exemplified by a blade length L of 15 to 30 cm (20 cm in the drawing) and a shank portion (base metal portion) thickness T. Is 0.4 mm to 1.0 mm (0.5 mm in the figure), and the blade edge portion 10 is formed continuously to the shank portion. The blade edge portion 10 will be described in detail with reference to FIGS.

The blade edge portion 10 has a wave shape (wave blade) whose tip edge is continuously formed by a fine and smooth convex blade and a concave blade 12 (detailed as shown in an enlarged view in FIG. 3). In this shape, each of the blade surfaces of the convex portion (mountain portion) and the concave portion (valley portion) is R-shaped. Further, the cutting edge portion 10 has two rounded R-shaped convex blades, a high convex blade 11a and a low convex blade 11b, and is arranged every other one, and the R-shaped concave blade 12 formed between them. The depth of the is constant.
Specific cutting edge dimensions of the cutting blade 10 are exemplified. The inter-blade pitch P is 0.5 mm, the blade height H1 of the convex blade 11a is 50 μm, and the blade height H2 of the convex blade 11b is 25 μm (FIG. 3). FIG. 5 and FIG. 6).
Further, as the convex blades 11a and 11b are arranged in two steps, the blade thickness of both the convex blades 11a and 11b is changed, that is, the low convex blade 11b as known from FIGS. 4 (A) and 4 (B) and FIG. The blade thickness becomes thinner than that of the convex blade 11a. The relationship between the blade thicknesses of the convex blades 11a and 11b and the concave blade 12 is T1>T2> T3, where the blade thicknesses are T1, T2 and T3 (for the sake of convenience, the maximum thickness portion is shown) ( (See FIG. 6). Incidentally, the blade thickness T1 of the convex blade 11a is 25 μm to 50 μm, and 30 μm in the illustrated example.

An example of the step 1 stroke of the cutting operation using this cutting blade 10 (one reciprocating motion of fine vibration) is as shown in FIG. 7. As is known, the convex blade 11a and the convex blade 11b are moved against the workpiece W. Therefore, the cutting pressure applied to the workpiece W is distributed at two locations. Therefore, since the cutting pressure can be reduced as compared with the case of a general corrugated cutting blade, the occurrence of cracks in the workpiece W can be more reliably prevented. The fact that the cutting pressure can be reduced, in other words, can increase the vertical feed speed of the cutting blade 10, so that the cutting workability can be improved.
Further, as described above, the blade thickness T2 of the low convex blade 11b becomes thinner than the convex blade 11a, so that not only the cutting angle is reduced and the cause of crack generation is further reduced, but also the viscosity is as in a ceramic green sheet. Even in the case of a workpiece including a binder or the like, only the convex blade 11a corresponding to half of the entire convex blade contacts with the cutting side surface of the workpiece at the time of the slight vibration in the lateral direction, and adhesion with the workpiece W as the entire cutting blade. The cutting property can be improved because the property is reduced.

In the above embodiment, the case where the workpiece as a cutting object is a ceramic green sheet has been described. However, the cutting blade of the present invention has a high hardness, high toughness or brittleness, and has a high cutting resistance. The object can be applied without being limited to the ceramic green sheet.
In the above embodiment, the case where the cutting operation is performed when the cutting blade is lowered has been described. However, the present invention can also be applied when the cutting blade is raised, that is, when the workpiece is cut from the lower surface (full cut or half cut). Furthermore, the present invention can be applied to a case where a workpiece is half-cut from above and below by combining two cutting blades.

It is a front view which shows the cutting blade of this invention. It is the side view which abbreviate | omits and partially abbreviate | omits the cutting blade of FIG. It is an enlarged view of the X part in FIG. It is a bottom view of Drawing 3, and (A) is a sectional view which meets the (A)-(A) line in Drawing 3, (B) is a sectional view which meets the (B)-(B) line, (C ) Is a sectional view taken along the line (C)-(C), and (D) is a bottom view taken along the line (D)-(D). 3 is a side end view of FIG. 3, (E) is an end view taken along line (E)-(E) in FIG. 3, (F) is an end view taken along line (F)-(F), G) is an end view taken along line (G)-(G). FIG. 4 is a cross-sectional view (hatching omitted) taken along line (G)-(G) in FIG. 3. It is cutting operation explanatory drawing in the case of using the cutting blade of this invention.

Explanation of symbols

1: Cutting blade 10: Cutting edge 11a: High convex blade 11b: Low convex blade 12: Concave blade

Claims (5)

  In a cutting blade in which the cutting edge portion is formed in a wave shape in which a smooth convex blade and a concave blade are continuous, the cutting edge portion includes a high convex blade and a low convex blade having a height difference in the blade tip position, and a depth interposed therebetween. A cutting blade characterized by having a continuous waveform with a constant concave blade.   The cutting blade according to claim 1, wherein the cross-sectional thickness of the low convex blade is smaller than the cross-sectional thickness of the high convex blade.   The cutting edge is cut while the cutting edge portion is given a vertical feed and a fine vibration in the horizontal direction to the cut object placed on a plane. Cutting blade.   The cutting blade according to claim 3, wherein the object to be cut is a flexible material or a brittle material. The cutting blade according to claim 4, wherein the cutting object is an electronic component such as a ceramic green sheet or a laminate thereof.

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