JP2004050316A - Cemented carbide thin plate tool and straightening method of cemented carbide thin plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low-cost cemented carbide thin plate tool simply correcting a strain and to provide a straightening method for the cemented carbide. <P>SOLUTION: A laser beam 22 is irradiated on a projection part 14a of the strain due to a warp and the like on the surface of a cemented carbide thin plate 14 of a metal saw 10, or the cemented carbide thin plate tool. The laser beam 22 reforms the cemented carbide surface to correct the strain. The irradiation part 20 reformed by the irradiation of the laser beam 22 is also served as a display part of a mark and a symbol displayed on the cemented carbide thin plate 14. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cemented carbide thin plate tool and a method for removing strain of a cemented carbide thin plate used for cutting of metal or non-metallic materials and other applications.
[0002]
[Prior art]
Conventionally, for example, a metal saw made of a metal plate for a tool is formed of high speed steel or cemented carbide, and the disc of the cemented carbide thin plate is formed to have a predetermined size range by grinding or other processing. It was. Furthermore, a metal thin plate tool such as a metal saw formed of a tool steel material such as a high speed steel has been measured for surface irregularities and distortions, and the protrusions are hit with a hammer to correct the distortions.
[0003]
[Problems to be solved by the invention]
However, a cemented carbide sheet metal tool such as a cemented carbide metal saw has extremely low toughness, and cracks when struck with a hammer or the like, so that the distortion after the tool formation cannot be corrected. Therefore, the distortion of the cemented carbide thin plate formed by grinding is determined by the processing accuracy and cannot be suppressed below that. In addition, by measuring the surface of a cemented carbide sheet metal tool and shipping only those with a strain of a certain value or less, it is possible to provide a cemented carbide tool with less variation in distortion. The cost increases as the number of products increases and the yield decreases.
[0004]
The present invention has been made in view of the above-mentioned problems of the prior art, and can easily correct distortions such as warpage, and can be used for low-cost cemented carbide sheet metal tools and cemented carbide sheet distortions. The purpose is to provide a collection method.
[0005]
[Means for Solving the Problems]
The present invention is a cemented carbide sheet metal tool made of a sheet-shaped cemented carbide, which is irradiated with a laser beam on a warped or other convex portion of the cemented carbide sheet surface to thereby apply the surface of the cemented carbide alloy. It is a cemented carbide sheet metal tool that is modified and corrected for the above-mentioned distortion. The cemented carbide thin plate is a disk-like tool such as a metal saw, a milling cutter, or a round knife, and has a blade portion on the outer peripheral edge thereof. The irradiation section modified by irradiation with the laser beam can also serve as a display section for marks and symbols displayed on the cemented carbide thin plate.
[0006]
The present invention also relates to a strain relief method for a cemented carbide thin plate made of a thin plate-shaped cemented carbide, and after forming the cemented carbide thin plate from the cemented carbide plate by precision grinding or the like, By measuring the distortion of the alloy thin plate surface, such as warping, modifying the cemented carbide surface by irradiating the convex portion of the surface with a laser beam, and correcting the strain by a strain relief method for the cemented carbide thin plate. is there. The modification by the irradiation of the laser beam also serves as a laser beam scanning for imprinting a predetermined display displayed on the cemented carbide thin plate. The cemented carbide thin plate is a disk-shaped tool, and the laser beam is preferably a YAG laser for laser marking.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 3 show an embodiment of the present invention. The metal saw 10 of this embodiment is composed of a disk-shaped cemented carbide thin plate 14 which is a sintered alloy such as tungsten carbide, and a large number of blade portions 12 are formed at regular intervals on the periphery of the cemented carbide thin plate 14. ing. A through-hole 16 for clamping is formed concentrically at the center of the cemented carbide thin plate 14.
[0008]
Irradiation portions 20 in which the surface of the cemented carbide alloy is modified by irradiation with laser light are formed on the convex portions 14a of the surface of the cemented carbide thin plate 14 of the metal saw 10 that are irradiated with laser light. The irradiation unit 20 also serves as a display unit for symbols and marks displayed on the metal saw 10. In addition, stamps such as the irradiating portion 20 for removing distortion and predetermined characters are formed in other locations as necessary.
[0009]
In the manufacturing method of the metal saw 10 of this embodiment, after forming the cemented carbide thin plate 14 constituting the metal saw 10 from a cemented carbide disc by precision grinding or the like, the surface strain of the cemented carbide thin plate 14 is measured. To do. And as shown to Fig.2 (a), the laser beam 22 is irradiated to the convex part 14a among the measured surfaces of the cemented carbide thin plate 14, and the cemented carbide surface of the convex part 14a is modified | reformed. At this time, the modification by the irradiation of the laser beam 22 can also serve as marking of a predetermined symbol or mark displayed on the metal saw 10 of the cemented carbide thin plate 14. The laser beam 22 is a YAG laser for marking.
[0010]
Here, the irradiation device 24 of the laser beam 22 will be described with reference to FIG. The laser irradiation device 24 is a YAG laser using a laser material in which Nd (neodymium) is added to a YAG (Y ₃ Al ₅ O ₁₂ ) crystal. The laser irradiation device 24 includes a laser oscillator 26 and a scanning head 28 that irradiates an irradiation target with laser light.
[0011]
The laser oscillator 26 includes a YAG rod 30 that is a laser substance and a krypton arc lamp 32 that is an excitation source. The laser oscillator 26 includes a rear resonator mirror 34 and an output resonator mirror 36 that face both ends of the YAG rod 30. A Q switch element 38 is provided between the rear end of the YAG rod 30 and the rear resonator mirror 34. Between the front end of the YAG rod 30 and the output side resonator mirror 36, an aperture 40 and a shutter 42 are provided. Is provided. A red guide light laser diode 46 is provided outside the rear resonator mirror 34 via two guide light adjusting mirrors 44. A beam expander 48 that is an optical system for expanding laser light is provided on the output side of the output-side resonator mirror 36, and the laser light emitted from the beam expander 48 travels to the scanning head 28.
[0012]
The scanning head 28 is provided with a pair of galvanometer mirrors 50 that receive light from the beam expander 48. Each galvanometer mirror 50 scans the laser beam 22 in the XY axis directions orthogonal to each other, and is connected to a scanner 52 for scanning the laser beam 22.
[0013]
The scanning of the laser beam 22 is controlled by an instruction from the computer 56, with the scanner 52 connected to a pair of drivers 54 in the laser oscillator 28, and the driver 54 connected to a computer 56 such as a personal computer. A scanning command of a predetermined laser beam 22 is input to the computer 56 from a keyboard (not shown) or the like. In this embodiment, the irradiation part 20 of the pattern or symbol of a predetermined shape is formed in the convex part 14a part by measurement by keyboard operation of the computer 56. FIG.
[0014]
The irradiation method of the laser beam 22 is performed, for example, by causing the Q switch pulse to be oscillated by the Q switch element 38 with substantially the same output as the laser marking. What is necessary is just to set suitably the energy density and beam diameter of a laser beam according to the moving speed of the laser beam 22, the range of the irradiation part 20, etc. FIG. The output energy may be such that the extreme surface layer portion of the surface of the cemented carbide thin plate 14 of the cemented carbide is modified similarly to the laser engraving.
[0015]
As shown in FIG. 2B, the convex portion 14a modified by the laser light 22 of the surface of the measured cemented carbide thin plate 14 irradiated with the laser beam is modified. The distortion at the part is corrected and flattened. This mechanism is presumed to be because a part of the ultra-thin surface layer of the cemented carbide is slightly melted once by the laser beam 22 and then rapidly cooled and contracted to generate a tensile stress on the surface.
[0016]
The metal saw 10 of this embodiment can easily correct the distortion simply by irradiating the cemented carbide thin plate 14 with the laser beam 22 for laser engraving. A metal saw with no variation can be provided. In addition, the irradiation part 20 of the laser beam 22 also serves as a mark for displaying a predetermined symbol or mark, so that unnecessary patterns can be reduced and the distortion of the metal saw 10 can be corrected.
[0017]
In addition, the strain relief method of the cemented carbide thin plate tool and the cemented carbide thin plate of the present invention is not limited to the above-described embodiment, and the applied cemented carbide thin plate is a milling machine, a slitter, a round in addition to a metal saw. The present invention can be applied to various tools such as knives, and can also be used for cemented carbide tools other than discs. In addition, the tool of the present invention includes a spacer for setting a constant interval, and is used for all surface shape distortion removing methods that require a certain flatness and other dimensional accuracy of a cemented carbide thin plate. It is possible.
[0018]
Moreover, the laser irradiation apparatus used for this invention is not restricted to a YAG laser, What is necessary is just to be able to obtain an appropriate output. For example, a laser irradiation apparatus in which laser beams from a plurality of laser diodes are guided by an optical fiber may be used as long as a predetermined modification can be performed on the surface of the cemented carbide.
[0019]
【The invention's effect】
The present invention provides a cemented carbide sheet metal tool and a method for strain relief of the cemented carbide sheet, providing a highly accurate cemented carbide sheet and a tool using the same without requiring operator skill. can do. Further, the laser beam irradiation process in the manufacturing process is easy, and the increase in manufacturing cost is small. Furthermore, the irradiation part irradiated with the laser light also serves as a predetermined display part, thereby suppressing an increase in the number of manufacturing steps and reducing unnecessary patterns on the surface.
[Brief description of the drawings]
FIG. 1 is a front view of a metal saw according to an embodiment of a cemented carbide sheet metal tool of the present invention.
FIG. 2 is a schematic view showing a distortion correcting process of the metal saw of this embodiment.
FIG. 3 is a schematic diagram of a laser irradiation apparatus used in this embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Metal saw 12 Blade part 14 Cemented carbide thin plate 14a Convex part 20 Irradiation part 22 Laser beam

Claims (6)

In a cemented carbide sheet metal tool made of a sheet-shaped cemented carbide, the surface of the cemented carbide sheet is irradiated with laser light to modify the surface of the cemented carbide and correct the distortion. A thin plate tool made of cemented carbide, characterized by comprising: 2. The cemented carbide thin plate tool according to claim 1, wherein the cemented carbide thin plate is a disk-shaped tool. The cemented carbide sheet metal tool according to claim 1 or 2, wherein the irradiation section modified by irradiation with the laser beam also serves as a display section displayed on the cemented carbide sheet. In the method for removing strain of a cemented carbide sheet made of a cemented carbide sheet, after forming the cemented carbide sheet from the cemented carbide sheet, measuring the surface strain of the cemented carbide sheet, the above A method for removing strain from a cemented carbide thin plate, wherein the surface of the cemented carbide is irradiated with a laser beam to modify the surface of the cemented carbide to correct the strain. 5. The cemented carbide alloy product according to claim 4, wherein the modification by the laser beam irradiation also serves as a laser beam scanning for imprinting a predetermined display displayed on the cemented carbide thin plate. Thin plate strain relief method. 6. The method for strain relief of a cemented carbide thin plate according to claim 4, wherein the laser beam is a YAG laser.

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