JPH06246735A - Cutter plate for stone - Google Patents

Abstract

PURPOSE:To largely extend service life with small wear rate without wavy distortion. CONSTITUTION:At least a side face 4 of a cutting edge is obliquely quenched intermittently at a pitch of a range of 10-40mm intermittently at an oblique angle of a range or 45-90 deg. to a cutting edge face by high frequency induction heating so that cured parts 5 and uncured parts 5 are alternately present. The cured and uncured parts exist on a cutter plate thereby to improve wear resistance, to prevent slipping of grit in the uncured part and to improve sharpness. Thus, requirements for improvement of the wear resistance, shortening of a cutting time and smooth finishing of a section can be simultaneously satisfied.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stone cutter plate used for thinning rough stones such as lumps of marble or granite onto a slab.

[0002]

2. Description of the Related Art Rough stone such as marble or granite has a mass of several tons and is used as a slab in a processing plant. Conventionally, in order to thin these rough stones into slabs, a stone cutter plate 21 made of a thin steel plate having a width of 100 mm, a thickness of 4 mm and a length of 4 to 5 m as shown in FIG. A cutter 10 is used in which a large number of side-by-side side-by-side side-by-side side-by-side side panels are assembled at a predetermined interval. In this thinning process, the cutter 20 is brought into contact with the rough stone W to supply grit between the rough stone and the cutting edge surface of the cutter plate 21 while moving forward and backward in the direction of an arrow at a predetermined speed under a pressure of a predetermined load P. However, since the thickness of the rough stone W is usually about 2 m, it takes several days to one week or more continuously for 24 hours.

A conventional stone cutter plate (hereinafter simply referred to as a cutter plate) has a hot-rolled plate thickness of 4
mm carbon steel sheet for machine structure (S55C to SEA105
However, since the cutting process takes a long time, wavy distortion occurs, the amount of wear is large, the service life is short, and the material can usually be used only once. Furthermore, a cutting plate accident is likely to occur during cutting. Therefore, conventionally, in order to reduce the wear degree of the cutter plate, improve the life, and eliminate uneven cutting, the cutter plate has a yield point of 9
Those that have been heat-treated to have a strength of 0 kg / mm ² or more (Actual No. 1-70512, No. 4-71212), those with long grooves for iron sand supply formed on both sides of the blade edge of the cutter plate (actual actual) 62-98113), etc.,
Various measures have been proposed. Although these measures have a predetermined effect in improving the strength of the cutter plate or eliminating cutting unevenness due to uniform supply of grit, it cannot be said to be sufficient to satisfy both of the above requirements at the same time.

[0004]

DISCLOSURE OF THE INVENTION The present invention was devised in order to solve the above-mentioned problems of conventional cutter plates, in which wavy distortion does not occur and the degree of wear is small.
An object of the present invention is to provide a stone cutter plate capable of significantly extending the service life.

[0005]

A stone cutter plate of the present invention which solves the above problems is a stone cutter plate formed of a narrow long steel plate, and is intermittent on a cutting edge surface and / or a cutting edge side surface. It is provided with a technical configuration characterized in that it is hardened by heat so that hardened portions and uncured portions are alternately present. It is desirable that the hardened portion is formed by obliquely quenching at least on the side surface of the cutting edge at a predetermined pitch, and the pitch is in the range of 10 mm to 40 mm and the inclination angle is in the range of 45 ° to 90 ° with respect to the cutting edge surface. desirable. Further, the cutter plate is not limited to a cutter plate having a flat blade edge side surface, but may be a cutter plate having long grooves for grid supply formed on the blade edge side surface.

[0006]

The existence of the uncured portion and the cured portion on the cutter plate improves the wear resistance at the cured portion, prevents slipping of the grit at the uncured portion, and improves the sharpness. In particular, by intermittently quenching the side surface of the cutting edge, it is possible to prevent a decrease in strength due to the presence of an uncured portion, and improve the strength of the cutter plate in the longitudinal direction.

[0007]

FIG. 1 shows an embodiment of a cutter plate according to the present invention. The cutter plate 1 is formed of a carbon steel plate material for mechanical structure having a plate thickness of 4 mm which is hot-rolled similarly to the conventional cutter plate, and holes 2 through which an assembling bar material penetrates are formed at both ends thereof. There is. In the cutter plate of the present embodiment, the cutting edge surface 3 is locally quenched by high frequency induction heating at the equal pitch p, and the same pitch is applied to both cutting edge side surfaces 4 so as to follow the hardening portion of the cutting edge surface 3. At p, the steel is intermittently quenched at an inclination angle α, and is similarly tempered by induction heating to heat-treat so that the hardened portions 5 and the uncured portions 6 are alternately present on the cutting edge surface 3 and the cutting edge side surface 4. There is. Pitch p between hardened part 5 and uncured part 6
Can be freely selected by changing the ON / OFF interval of heating by the high frequency induction heating coil and the feed rate of the cutter plate. Also, the inclination angle α for oblique quenching can be freely selected by changing the angle of the high frequency induction heating coil.

In the above embodiment, the hardened portion and the uncured portion are present on both the cutting edge surface 3 and the cutting edge side surface 4.
It is not always necessary to exist on both surfaces, but it is possible to exist on either surface. However, it is preferable to intermittently quench the side surface of the cutting edge. The cutter plate configured as described above is assembled and used in the same manner as the conventional stone cutter shown in FIG. 3, but the method of use is the same as the conventional one, and the description thereof is omitted. Needless to say, the present invention can be applied not only to a cutter plate having a flat blade edge side surface but also to a cutter plate having a long groove for grit supply formed on the blade edge side surface. FIG. 2 shows an embodiment in that case. The cutter plate 10 of the present embodiment has a long groove 1 for supplying grit on the side surface 11 of the cutting edge.
3 is formed, and the hardened portion 14 is intermittently formed on the cutting edge side surface 11 and the cutting edge surface 12 by oblique quenching at an equal pitch. As a result, hardened portions 14 and uncured portions 15 are alternately present across the long groove 13 on the side surface of the cutting edge, as in the above-described embodiment.

Next, an example in which a stone material is cut by using a cutter plate having a flat cutting edge side surface as shown in the embodiment of FIG. 1 will be described. Example 1 Cutter plate Material: Carbon steel sheet material for machine structure SAE1541 Material Heat treatment: Inclination angle 45 on both blade edge sides by high frequency induction heating
°, pitch 20 mm (Example 1-1), and inclination angle 80
Diagonal quenching was locally performed at a pitch of 40 mm (Example 1-2), and tempering was performed by high-frequency induction heating to obtain a cutter plate having a hardness of hardened portion HRC48. With the above cutter plate, a white granite having a cut surface of 300 mm × 100 mm was cut using mixed grits and shots. As a result, the abrasion loss of the cutter plate after cutting was 1.45 mm for the cutter plate of Example 1-1 and 2.00 mm for the cutter plate of Example 1-2. The time required for cutting was 72 minutes in Example 1-1 and 97 minutes in Example 1-2. As a comparative example, a cutter plate made of the same material as in Example 1 was hardened and tempered to obtain a cutter plate having a hardness of HRC47, which was used to cut white granite under the same conditions as in the case of the above embodiment. . As a result, the abrasion loss of the cutter plate after cutting was 1.95 mm. The cutting time was 126 minutes.

When the above-mentioned Examples 1-1 and 1-2 and Comparative Example 1 are compared, Example 1-1 is much less in wear amount and cutting time of the cutter plate than in Comparative Example. on the other hand,
In Example 1-2, the degree of wear of the cutter plate was slightly higher than that of the comparative example and almost the same, but the cutting time could be shortened by about 30 minutes. Regarding the state of the cut surface of the white granite, the finish of Examples 1-1 and 1-2 was higher than that of the comparative example without uneven cutting and high flatness. From the above, as compared with the case where the entire cutter plate is simply quenched, like the present invention, by partially obliquely quenching at an appropriate pitch, it is possible to exhibit excellent effects in wear resistance and cutting time. confirmed. Further, the cutter plate characteristics also change depending on the pitch of oblique quenching, and in the above-described embodiment, the characteristics of the embodiment 1-1, that is, the one having a pitch of 20 mm shows a better characteristic than the case of 40 mm, which is desirable.

Example 2 Material: S50C material Heat treatment: Inclination angle 45 on both blade edges by high frequency induction heating
°, pitch 20 mm (Example 2-1), and inclination angle 80
Diagonal quenching at a pitch of 40 mm (Example 2-2) and tempering by high frequency induction heating to obtain the hardness HR of the quenched portion.
A cutter plate of C48.5 was obtained. With the obtained cutter plate, white granite having a cut surface of 300 mm × 100 mm was cut in the same manner as in Example 1 using mixed grind and shot abrasive grains. As a result, the abrasion loss of the cutter plate after cutting was 1.10 mm for the cutter plate of Example 2-1 and 1.95 mm for the cutter plate of Example 2-2. Further, the time required for cutting was 120 minutes in Example 2-1 and Example 2-
2 was 95 minutes. Further, as a comparative example, the white granite was similarly cut under the same conditions as those in Examples 2-1 and 2-2 using a cutter plate formed by using the hot-rolled S50C material as it was. As a result, in the case of the comparative example, the cutting time was about 115 minutes, which was not much different from the case of the example, but the abrasion loss was remarkably large at 3.5 mm.

[0012]

As described above, according to the stone cutter plate of the present invention, the existence of the uncured portion and the cured portion improves wear resistance in the cured portion and slips of grit in the uncured portion. Therefore, the sharpness can be improved, and it is possible to simultaneously satisfy the requirements of abrasion resistance, reduction of cutting time, and smooth finish of the cut surface, which cannot be achieved by the conventional cutter plate. Particularly, by intermittently quenching obliquely, strength reduction due to the presence of uncured parts can be prevented, the strength of the cutter plate in the longitudinal direction is improved, wavy distortion does not occur, and the service life of the cutter plate is improved. Can be significantly extended.

[Brief description of drawings]

FIG. 1 is a perspective view of a stone cutter plate according to an embodiment of the present invention.

FIG. 2 is a perspective view of a stone cutter plate according to another embodiment of the present invention.

FIG. 3 is a perspective view of a conventional stone cutter showing a state of cutting stone.

[Explanation of symbols]

1, 10 Cutter plate 3, 12 Blade edge surface 4, 11 Blade edge side surface 5, 14 Hardened portion 6, 15 Unhardened portion 13 Long groove

Claims (4)

[Claims] 1. A cutter plate for stones, which is formed of a narrow and long steel plate, wherein the cutting edge surface and / or the cutting edge side surface is intermittently quenched so that hardened portions and uncured portions are alternately present. A cutter plate for stones that is characterized by 2. The stone cutter plate according to claim 1, wherein the hardened portion is formed by obliquely quenching the side surface of the cutting edge at a predetermined pitch. 3. The stone cutter plate according to claim 1, wherein a long groove is formed on the side surface of the cutting edge. 4. The oblique quenching pitch is 10 mm to 40 mm
The cutter plate for stone material according to claim 2 or 3, wherein the inclination angle is 45 ° to 90 ° with respect to the cutting edge surface.