JP4953878B2 - Cutting blade - Google Patents

Description

  The present invention relates to a cutting blade used for cutting a work material having a structure in which raw material powders are gathered with a gap like a general grindstone.

  The general grindstone has a structure in which raw material powders are gathered with a gap. The both ends of this general grindstone are cut with a cutting blade in order to make the dimensions uniform.

  An example of the structure of a general grindstone is shown in FIG. The general grindstone 51 has a shape shown in FIG. 3A, and has a structure in which raw material powders 52 are gathered with a gap 53 as shown in a partial detail view of FIG. The general grindstone 51 has a function of improving the cutting performance and the discharge of chips by the gaps 53 between the raw material powders 52. In order to maintain high performance, the general grindstones 51 have a high accuracy in the gaps 53 between the raw material powders 52. It is necessary to maintain.

The structure of a conventional cutting blade used for cutting a general grindstone is shown in FIG. 4A is a front view, FIG. 4B is a side view, and FIG. 4C is a partially enlarged view thereof.
The cutting blade 61 is provided with a segment chip 63 on the outer peripheral end of a disc-shaped substrate 62, and the segment chip 63 is formed by bonding abrasive grains such as diamond with a binder. A slit 64 is formed at a predetermined interval on the outer peripheral side of the substrate 62, and a rotation shaft mounting hole 65 is provided at the center of the substrate 62. The end face 63a of the segment chip 63 is perpendicular to the rotation direction of the substrate 2 as shown in FIGS. 4 (b) and 4 (c).

In processing using a general grindstone as a work material, both ends of the work material are cut with a cutting blade and set to a desired length. As shown in FIG. 5A, the cut surface 54 of the work material 51 is sandwiched and divided into an outer discarded portion 55 and an inner use portion 56. The work material 51 is shown in FIG. 5B. As shown in the figure, since the innumerable holes 57 penetrate at right angles to the cutting surface 54, the cuttings 58 generated by the cutting due to the wind pressure caused by the rotation of the cutting blade 61 are holes in the work material 57 enters the wall 59 of the hole 57. Since the outer part is discarded without being used, there is no problem even if the chip 58 is clogged in the wall 59 of the hole 57, but the inner part is a part to be used. The characteristic of the gap 53 between them is lost. Therefore, it is necessary to carefully remove the chips 58.
Patent Document 1 describes an example in which a segment tip is inclined and attached to a diamond cutter.

Japanese Utility Model Publication No. 50-137691

However, in the structure described in Patent Document 1, it cannot be said that the function of discharging chips intensively on one side is sufficient when used for processing using a general grindstone as a work material. .
The present invention has been made to solve the above-described problems, and prevents the clogging of the work material having a gap between the raw material powders such as a general grindstone, so that the function is sufficiently exerted. An object of the present invention is to provide a cutting blade that makes it possible.

In order to solve the above-mentioned problems, the present invention is used for cutting a work material having a structure in which raw material powders are gathered with a gap like a general grindstone, and a segment chip is provided at the outer peripheral edge of a disc-shaped substrate. In the plurality of cutting blades, the end faces of the segment chips on the side where the plurality of segment chips face each other are inclined at a predetermined angle with respect to the direction perpendicular to the rotation direction of the substrate, and the inclination angle is about the two end faces. Unlike each other, the outer circumferential side slit provided in said substrate is formed to be inclined with respect to the rotational direction of the substrate, through holes are provided on the substrate so as not to contact with the segmented chips, the center axis of the through-hole Is inclined with respect to the rotation direction of the substrate .

  Since the end surfaces of the segment chips are inclined at a predetermined angle with respect to the direction perpendicular to the rotation direction of the substrate, and the inclination angles are different from each other for the two end surfaces, the interval between adjacent segment chips can be cut. It can be narrow on the side that sucks in the powder and wide on the side that discharges the chips. Therefore, the side which discharges a chip becomes a negative pressure rather than the side which inhales a chip, and it becomes easy to discharge | emit a chip. As a result, when cutting the work material, it is possible to suck out chips on the side that is unnecessary by cutting, prevent clogging of the chips on the side to be used, and there is a gap between the raw material powder It becomes possible to maintain the performance of the work material.

  Of the inclination angles, the larger angle is preferably 20 degrees or more and 50 degrees or less. If this angle is less than 20 degrees, the effect of sucking out chips from the inside of the work material will be reduced, which is undesirable because the chips will flow and clog, and if it exceeds 50 degrees, the segment tip will become sharply thin. It is not preferable because the strength is too low to be easily lost.

The present invention is characterized in that the slits provided on the outer peripheral side of the substrate are formed to be inclined with respect to the rotation direction of the substrate.
By forming the slit to be inclined with respect to the rotation direction of the substrate, it is possible to enhance the effect of preventing clogging of chips on the side used after cutting.

The present invention is characterized in that a through hole is provided in the substrate so as not to contact the segment chip, and the central axis of the through hole is inclined with respect to the rotation direction of the substrate.
In order to improve the chip suction effect, it is also possible to increase the number of slits. However, if this is done, the length of the segment chip must be shortened, and the bonding area between the substrate and the segment chip is reduced. The adhesive strength of the segment chip is weakened. However, by providing this through hole, the chip suction effect can be enhanced without weakening the adhesive strength of the segment chip.

In the present invention, the segment chip includes a central layer and side layers formed on both side surfaces of the central layer. The central layer has a flat tip surface and the side layer has a tapered surface. Features.
When the front end surface of the central layer is a flat surface, the cutting efficiency of the work material can be increased, and when the side surface layer has a tapered surface, the cut surface can be efficiently finished.

In the present invention, the central layer is formed using coarse particles having a particle size of 50 μm or more and 500 μm or less, and the side layer is formed using fine particles having a particle size of 40 μm or more and 400 μm or less. Features.
The center layer is formed using coarse grains having a large particle size, and the cutting efficiency is increased, and the side surface layer is formed using fine particles having a small particle size to improve the finished surface roughness. Can do. The particle size range of the coarse and fine particles overlaps each other. Here, within this particle size range, the particle size of the abrasive used in the side layer is the same as that of the abrasive used in the central layer. It means to make it smaller than the grain size. Specifically, the grain size to be used is selected depending on whether cutting efficiency is important, finishing surface roughness is important, or the balance between both is important. be able to.

  According to the present invention, a cutting blade that can prevent clogging of a work material having a gap between raw material powders such as a general grindstone, and can fully perform the function after cutting. Can be realized.

Below, this invention is demonstrated based on the embodiment.
FIG. 1 shows a configuration of a cutting blade according to an embodiment of the present invention. FIG. 1A is a front view, FIG. 1B is an enlarged side view of a segment chip, and FIG. 1C is a diagram showing its function. FIG. 1A shows only an overview of the cutting blade, and details will be described based on other drawings.
The cutting blade 1 is provided with a plurality of segment chips 3 on the outer peripheral end of a disk-shaped substrate 2, and the segment chips 3 are formed by bonding abrasive grains such as diamond with a binder. A slit 4 is formed at a predetermined interval on the outer peripheral side of the substrate 2, and a rotation shaft mounting hole 5 is provided in the center of the substrate 2.

The segment chip 3 is provided so as to be adjacent to the circumferential direction of the substrate 2, and the end surface 3 a of the segment chip 3 is in a direction perpendicular to the rotation direction of the substrate 2 as shown in FIG. The other end face 3b is inclined so as to form an angle θ2, which is an angle larger than the angle θ1, with respect to a direction perpendicular to the rotation direction of the substrate 2.
When cutting a work material using such a cutting blade 1, as shown in FIG. 1 (c), if the right side of the segment chip 3 is used and the left side is discarded, adjacent segment chips are used. The space | interval of 3 can be narrowed by the side which inhales a chip | tip, and can be widened by the side which discharges | emits a chip | tip. As a result, the side from which the chips are discharged has a negative pressure rather than the side from which the chips are sucked, and the chips generated by the cutting are efficiently discharged from the portion to be used to the portion to be discarded as indicated by the arrows.

  FIG.1 (d) has shown the other Example, FIG.1 (e) is the elements on larger scale. The end face 3 c of the segment chip 3 is inclined at a predetermined angle θ with respect to the direction perpendicular to the rotation direction of the substrate 2, and one end 3 d of the end face 3 c forming the inclined surface is perpendicular to the rotation direction of the substrate 2. As shown, a curved surface having a curvature R is provided. As a result, on the side for discharging the chips, the chips are discharged in a direction perpendicular to the substrate 2 as indicated by an arrow, and the stress at the time of discharging the chips can be reduced. In this example, a great effect can be obtained when a work material having a structure in which a plurality of tubular work materials are bundled is to be cut.

  In addition, the structure which has the structure shown in FIG.1 (b) and the structure shown in FIG.1 (d), ie, the space | interval of the adjacent segment chip | tip 3, is narrow on the side which inhales a chip, and wide on the side which discharges a chip. However, a curved surface having a curvature R may be provided so that one end portion 3d of the inclined end surface 3c is perpendicular to the rotation direction of the substrate 2.

2A and 2B show the arrangement of slits and through-holes provided in the substrate, FIG. 2A is a view seen from the substrate surface side, and FIG. It is the figure seen from the segment upper part.
The slit 4 is provided in order to enhance the chip discharging effect. The slit 4 has a cut end with respect to the rotation direction of the substrate 2 as shown in FIGS. 2 (a) and 2 (b). Can be tilted. In FIG. 2, the inclination angle of the slit 4 with respect to the direction perpendicular to the rotation direction of the substrate 2 is θs.

  Further, a through hole 6 is provided in the substrate 2 so as not to contact the segment chip 3, and the central axis of the through hole 6 is inclined with respect to the rotation direction of the substrate 2. In FIG. 2, the inclination angle of the central axis of the through hole 6 with respect to the direction perpendicular to the rotation direction of the substrate 2 is θh. If the number of the slits 4 is increased, the chip suction effect is improved. However, if this is done, the length of the segment chip 3 must be shortened, and the bonding area between the substrate 2 and the segment chip 3 is reduced. Adhesive strength is weakened. However, by providing the through hole 6, the chip suction effect can be enhanced without weakening the adhesive strength of the segment chip 3.

  FIG. 2C shows a cross-sectional shape when cut perpendicular to the longitudinal direction of the segment tip 3 with the tip portion of the segment tip 3, that is, the side first in contact with the work material facing downward. The segment chip 3 includes a central layer 3e and side surface layers 3f formed on both side surfaces of the central layer 3e. The central layer 3e has a flat tip surface 3g that acts first on grinding, and has a particle size of 50 μm. It is formed using coarse particles of 500 μm or less (# 35 to # 270). The side layer 3f has a tapered surface 3h and is formed using fine particles having a particle size of 40 μm or more and 400 μm or less (# 40 to # 325). At the time of grinding, the tip surface 3g of the center layer 3e cuts the work material, and the tapered surface 3h of the side layer 3f finishes the cut surface of the work material. The reason why the center layer 3e is formed using coarse grains is to emphasize the sharpness and increase the processing efficiency. The reason why the side layer 3f is formed using fine grains is that the finished surface roughness is reduced. It is for improving.

Test examples are shown below.
The following cutting blades were prepared and subjected to a cutting test.
Dimensions 305D x 47L x 5.0T x 7X x 4.0E x 19N
Work Material Vitrified General Grinding Wheel Work Material Dimensions Outer Diameter 3 x Inner Diameter 2.5 mm x Length 200 mm (20 pieces are bundled and cut)

The cutting conditions are shown below.
Cutting test machine Gate type electric cutting machine Cutting blade peripheral speed 2000m / min
Feeding speed 2m / min
Cutting amount Cutting in 1 pass

  Tables 1, 2 and 3 show the weights of chips remaining after cutting with a metal bond cutting blade having a specification of SD40 / 80 and remaining inside the cut material. Table 1 shows the test results for the conventional case in which θ1 and θ2 are equal in FIG. 1B, and Table 2 shows the test results for the case where θ2 is larger than θ1 (invention product 1). Further, Table 3 shows the test results for those having a curved surface (invention product 2) such that one end of the inclined surface is perpendicular to the rotation direction, as shown in FIG. 1 (d).

As can be seen from the above results, the inventive product 1 and the inventive product 2 both have a reduced residual chip weight after cutting as compared with the conventional product. Inventive product 1 is due to the generation of negative pressure on the side of discharging chips, and Inventive product 2 is due to a reduction in stress when discharging chips.
Next, Table 4 shows the effect obtained by forming the slits provided on the outer peripheral side of the substrate so as to be inclined with respect to the rotation direction.

  Further, Table 5 shows the effect obtained by providing the substrate with a through hole and inclining the central axis of the through hole with respect to the rotation direction of the substrate.

  In any case, in addition to making θ2 larger than θ1 in FIG. 1B, the slit is formed to be inclined with respect to the rotation direction, or the central axis of the through-hole is made to the rotation direction of the substrate. The residual chip weight is reduced by forming it by inclining.

  Next, Table 6 shows the amount of chipping on the surface of the work material after the cutting process when the particle size of the cutting blade is changed.

  As can be seen from the above results, the chipping amount can be reduced by making the particle size of the side layer smaller than that of the central layer.

  INDUSTRIAL APPLICABILITY The present invention can be used as a cutting blade capable of preventing the clogging of a work material having a gap between raw material powders such as a general grindstone and sufficiently exerting the function. .

It is a figure which shows the structure of the cutting blade which concerns on embodiment of this invention. It is a figure which shows the detail of a cutting blade. It is a figure which shows an example of the structure of a porous work material. It is a figure which shows the structure of the conventional cutting blade currently used for the cutting | disconnection of a porous workpiece. It is a figure which shows the mode of a cutting | disconnection.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cutting blade 2 Board | substrate 3 Segment chip | tip 3a End surface 3b End surface 3c End surface 3d End part 3e Center layer 3f Side surface layer 3g Tip surface 3h Tapered surface 4 Slit 5 Hole 6 Through-hole

Claims (4)

In a cutting blade that is used to cut a work material having a structure in which raw material powder is gathered with a gap like a general grindstone , and a plurality of segment chips are provided on the outer peripheral edge of a disc-shaped substrate, inclined at an angle to the direction perpendicular to the rotational direction end surface of the substrate facing each other side of the segmented chips, the inclination angle varies from each other for the two end faces, provided on the outer peripheral side of the substrate The slit is formed to be inclined with respect to the rotation direction of the substrate, a through hole is provided in the substrate so as not to contact the segment chip, and the central axis of the through hole is inclined with respect to the rotation direction of the substrate . Cutting blade characterized by.   The cutting blade according to claim 1, wherein a larger angle of the inclination angles is 20 degrees or more and 50 degrees or less. The segment chip includes a center layer and side layers formed on both side surfaces of the center layer, wherein the center layer has a flat tip surface and the side layer has a tapered surface. The cutting blade according to 1 or 2 . The center layer is formed using coarse particles having a particle size of 50 μm or more and 500 μm or less, and the side layer is formed using fine particles having a particle size of 40 μm or more and 400 μm or less. 3. The cutting blade according to 3 .

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