JPH0451978Y2 - - Google Patents

Description

[Detailed Description of the Invention] Purpose of the Invention (Field of Industrial Application) The present invention relates to a disc-shaped cutter used for cutting or milling hard materials such as stone and metal.

(Prior art) As this type of disc-shaped cutter, for example,
There is one disclosed in Japanese Patent No. 56-52955 or Japanese Patent Application No. 57-31414, in which a large number of press grooves of the same length are provided radially and rotationally symmetrically on one side of a disc-shaped base metal, and on the other side. A similar number of press grooves are provided to be offset in the direction of rotation from the set positions of the press grooves, and the rigidity of the cutter is increased by these press grooves on both sides.

(Problem to be solved by the invention) However, since the press grooves are set to the same length, residual stress due to the press is generated near the boundary between the press groove setting area on the peripheral side and the non-press area in the center. The slope is relatively steep. Therefore, this steep residual stress responds sensitively to the high temperature of the cutter that occurs when cutting hard materials, and induces deformation of the cutter on the center side where the shearing action in the circumferential direction due to rotary cutting is greater than on the peripheral side. There is a problem of being exposed.

Structure of the invention (Means for solving problems) Therefore, in the present invention, at least two sets of adjacent press grooves of different lengths are provided on one side of the disc-shaped base metal in a radial and rotationally symmetrical manner, and On the other surface of the plate-shaped base metal, a set of press grooves having the same long/short and positional relationship as the set of press grooves is provided so as to be offset in the circumferential direction from the set position of the press grooves on the one side, and the disk A blade is provided integrally or separately on the periphery of the shaped base metal.

(Function) That is, by giving a rotationally symmetrical long/short relationship to a large number of press grooves arranged radially and rotationally symmetrically, the boundary area between the pressed area on the peripheral side and the non-pressed area on the central side is Compared to conventional cutters, it spreads out and the degree of dispersion of residual stress due to pressing action is increased. Therefore, the gradient of the residual stress near the boundary becomes gentle, and the reaction of the residual stress to the increase in temperature accompanying the cutting action is suppressed to a range that does not lead to deformation of the cutter.

(Example) Hereinafter, the first and second examples embodying the present invention will be described.
This will be explained based on the diagram.

A shaft hole 1a is transparently provided in the center of the disc-shaped base metal 1, and as shown by the solid line in FIG. A plurality of presses are formed radially and rotationally symmetrically from the radially intermediate portion to the periphery. Both the long and short grooves 2 and 3 are subjected to a pressing action that becomes deeper toward the periphery than the central plane of the non-pressed part of the base metal 1, and the ends of the long pressed grooves 2 and the flat plane of the central non-pressed part are smooth. is connected to. Similarly, as shown by broken lines in FIG. 1, press grooves 4 and 5, which are symmetrical to the press grooves 2 and 3 on the front and back surfaces, are formed on the other surface of the base metal 1 in the circumferential direction from the set positions of the press grooves 2 and 3. The grooves 2, 3, 4, and 5 on both sides are press-formed at the same time. An annular blade body 6 in which diamond particles are embedded is sintered and fixed to the peripheral edge of the base metal 1.

In a disc-shaped cutter having such a configuration, the boundary between the non-pressing area in the center of the base metal 1 and the pressing area on the peripheral side alternately goes in and out in the radial direction in a rotationally symmetrical manner, unlike the conventional cutter with the same length. It is much wider than the boundary area between the pressed area and the non-pressed area when forming the pressed groove. As a result, the residual stress caused by the pressing action is dispersed in the boundary region which is wider than before, and the gradient of the residual stress becomes gentler. Therefore, the response of residual stress near the boundary region to the high temperature of the cutter when cutting stone etc. is slowed down, suppressing the induction of thermal strain, and the shearing action in the circumferential direction due to rotary cutting is Deformation of the cutter on the large center side is prevented. Therefore, cutting or machining of hard materials such as stone is always performed smoothly.

Of course, the present invention is not limited to the above-mentioned embodiment. For example, as shown in FIG. , 11, and 12 may be provided radially and rotationally symmetrically, or the blade portion may be integrally formed on the peripheral edge of the base metal.

Effects of the invention As detailed above, the present invention expands the boundary area between the pressed part and the non-pressed part by combining press grooves of different lengths, so that the gradient of residual stress caused by the pressing action is smoothed. It has the excellent effect of suppressing thermal strain.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment embodying the present invention, FIG. 2 is an enlarged sectional view taken along the line A--A in FIG. 1, and FIG. 3 is a side view showing another example. Base metal...1, press groove...2, 3, 4, blade body...
...6.

Claims (1)

[Scope of utility model registration request] A set of at least two adjacent press grooves 2 and 3 of different lengths are provided on one side of the disc-shaped base metal 1 in a radial and rotationally symmetrical manner, and the other side of the disc-shaped base metal 1 is provided with the set of press grooves 2 and 3 of different lengths. A set of press grooves 4 and 5 having the same length and position relationship as the press grooves 2 and 3 is provided so as to be shifted in the circumferential direction from the set position of the press grooves 2 and 3 on the one side, and a disc-shaped base metal is formed. A disc-shaped cutter characterized by having a blade part 6 on the periphery of the cutter.