Cutting – Tool or tool with support – Cutting couple type
Reexamination Certificate
1999-08-18
2001-08-14
Rachuba, M. (Department: 3724)
Cutting
Tool or tool with support
Cutting couple type
C083S697000, C083S686000, C083S929100
Reexamination Certificate
active
06272962
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a flat cutting blade for use in a cutting machine and, more particularly, to a cutting blade for cutting a sheet-like substrate such as a ceramic green sheet.
2. Description of Related Art
There is a cutting machine suitable for getting a plurality of chips by cutting, into a form of checkers, a sheet-like substrate (material sheet) such as a ceramic green sheet before sintering. The cutting machine is designed to cut with a flat cutting blade pressed like a guillotine against a work at a given spacing (pitch feed). The overall cutting section of the cutting blade thus used is formed in a shape of a sharp V-edge in a front view.
With a recent tendency to down-size electronic equipment, there has been a demand for small chips measuring for example 0.6 mm long by 0.3 mm wide. To cut a work by pressing a guillotine type double-edged cutting blade mentioned above while maintaining a given working accuracy, it becomes necessary to decrease the edge angle to minimize deformation of a cut surface of the work.
This type of cutting blade, therefore, is provided with a edge angle of around 10 deg. to 30 deg. and a shank thickness of around 1 mm.
This type of cutting blade is detachably mounted on a vertically movable tool holder of a cutting machine not depicted, and a centering camera is mounted on a supporting body of the tool holder, so that the centering camera will make an exposure of a pair of line marks provided in opposite positions at an equal spacing on the edges of a work (on four edges in the case of a rectangular work) every time the work is fed for a specific amount each pitch. Furthermore an image thus obtained is processed to center the line marks, and, after moving by the amount of correction to correct an index table on which the work is held by adsorption, the cutting blade is fed downwardly to cut the work.
This operation is repeated every time of pitch feed in a given direction of length of the work, and after the completion of operation in one direction, the work W on the index table is turned through 90 degrees and is cut in a like manner as described above, thereby making chips.
At this time, the four edges carrying the line marks are unsuitable for use as cut chips because of the presence of the line marks. Therefore, it is a mainstream of a cutting method to cut a work into a form of checkers, leaving the cutting edge portion of the work in the form of a frame.
However, if the edge angle is formed much smaller without altering the blade thickness (thickness of the shank portion), the surface area of the edge surfaces (cutting portion) on both right and left sides naturally increases; and both the right and left sides work as a great resistance at the time of cutting. Therefore a great cutting force is needed at the time of cutting, with the result that the cutting edge portion will be subjected to buckling deformation.
SUMMARY OF THE INVENTION
In view of the above-described disadvantages inherent to the heretofore known cutting blades, it is an object of the present invention to provide a flat cutting blade which cuts well and has a high buckling strength at the cutting edge portion even at a desired edge angle.
It is another object of the present invention to provide a cutting blade suitable for making microchips.
It is further another object of the present invention to provide a cutting blade which can prevent sideward fall and scattering of chips when a work is cut into a form of checkers to make chips while leaving its edges in the form of frame.
As a technological means for attaining the above-described objects, the gist of first aspect of the present invention is that the cutting blade is a flat cutting blade for cutting a thin plate-like work; the cutting portion formed from the forward end towards the shank portion is comprised of a cutting edge portion formed for a specific length and having right and left concave curved surfaces symmetric with respect to the centerline, and a continuous portion which is continuously formed through from the cutting edge portion to the shank portion so that the blade thickness will gradually increase as it goes towards the shank portion, and is formed of single-stage or multi-stage concave curved surfaces symmetric with respect to the centerline; and that fine vertical lines of projections and depressions are formed by grinding for the entire length of the blade in the same direction as the direction of the curved surface, on both the right and left sides of the cutting edge portion and the concave curved surface of the continuous portion.
According to the technological means stated above, the cutting edge portion having a desired edge angle to perform work cutting has flat or concave curved surfaces formed symmetrical with respect to the centerline for a given length (a minimum required), and a continuous portion connecting the cutting edge portion with the shank portion is connected on the symmetrical concave curved surfaces so that the cutting edge portion will gradually increase as it goes from the rear end (upper end) of the cutting edge portion towards the shank portion, thereby restraining a contact resistance to be added from the continuous portion to the work during cutting operation. Consequently work cutting operation can be done with little cutting force without buckling deformation of the cutting edge portion.
The cutting edge portion cuts well as if shearing with the fine vertical lines of projections and depressions.
Referring to the gist of second aspect of the present invention, both the right and left surfaces of the cutting edge portion stated in first aspect of the present invention is comprised of flat surfaces and are mirror-finished through the entire length of blade, and further that fine lines of projections and depressions are formed, in the concave curved surface of the continuous portion, by grinding over the entire length of the blade in the same direction as the curved surface on said concave curved surface of said continuous portion.
According to the technological means, it is possible to obtain fine cut chips with a beautiful cut surface in addition to the above-described advantages.
To explain the gist of third aspect of the present invention, in the continuous portion, a concave curved surface continuous to the cutting edge portion, and each upper-stage concave curved surface continuous to the lower-stage concave curved surface are formed on a midway and provided with a little thinner portion than the numbered angle at the lower stage, and then the upper-stage concave curved surfaces are symmetrical concave curved surfaces which gradually increase in thickness.
According to the technological means, numbered edge angles include the edge angle designated as No. 1 angle, and upper-stage concave curved surfaces as No. 2 angle, No. 3 angle, and so forth.
Therefore, the symmetrical concave curved surfaces of the upper stage have No. 2 angle and are located immediately above the cutting edge having No. 1 angle. The edge contact with a work of the concave curved surfaces decreases, thereby restraining the cutting resistance of No. 2 angle (symmetrical concave curved surfaces at the upper stage located immediately above the cutting edge portion), thus enabling to cut a work with a less cutting force, that is, to achieve a very good cutting quality.
To give the gist of fourth aspect of the present invention, both ends of the blade in the direction of blade length are V-shaped throughout the blade height as viewed in a plan view. The gist of fifth aspect of the present invention is that both ends of the blade in the lengthwise direction are formed at least in a V-shape in a plan view throughout the blade height of the continuous portion.
According to the technological means, when cutting a work into a checkers form to make chips while leaving the edge of the work in the form of a frame, the cutting blade is fed down to cut into the work; at this time, both ends of the work are likely to be torn and spread as sh
Wakabayashi Noriyuki
Yasoda Hisashi
Greenblum & Bernstein P.L.C.
Rachuba M.
UHT Corporation
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