Alloy saw blade with olive-shaped air holes

Abstract

The utility model relates to an olivary air hole alloy saw blade. The olivary air hole alloy saw blade comprises a base body and tool bits. An olive-shaped air hole is formed in the middle of the base body; the air holes are uniformly distributed along the circle center of the substrate; each air hole is composed of two semi-ellipses with coincident long axes. 1 / 2 of the long axis of the ellipse close to the outer circle of the base body is C1, 1 / 2 of the long axis of the ellipse close to the center position of the base body is C2, and C2 is larger than or equal to C1; the dimension of the short axis is B, B: (C1 + C2) = 0.25-0.75, and the long axis of the ellipse is arranged along the radial direction of the base body; the distance between the outermost vertex of the outer ellipse of the air hole and the bottom circle of the chip pocket of the base body is L, and L is larger than or equal to 10% * D2 and smaller than or equal to 20% * D2; the distance between the innermost vertex of the ellipse in the air hole and the center of the base body is L1, and L1 is larger than or equal to 15% * D2 and smaller than or equal to 25% * D2; the beneficial effects of the utility model are that the olivary air holes are closer to the sector, which is beneficial to the uniformity of tangential strain in the radius direction and improves the additional tangential stress generated by uneven tangential strain in the radius direction; the curvature radius of the radial edge of the olive-shaped air hole is large, so that the circumferential pressure stress is released more thoroughly.

Description

Technical Field

[0001] The utility model relates to the technical field of alloy saw blades, in particular to an olive-shaped air hole alloy saw blade. Background Art

[0002] The carbide saw blade is composed of a base and a carbide cutter head brazed on a uniformly distributed tooth seat outside the base. The base is the part inside the saw blade that supports and fixes the blade and transmits movement and power to the cutter head; while the cutter head is the working part of the entire saw blade, which is evenly distributed on the outer edge of the base and plays a cutting role on the cutting object.

[0003] The matrix is ​​a typical circular thin sheet structure with low circumferential stiffness, which is easy to be unstable and deformed along the circumference, which is a common phenomenon of circular saw blades. Once instability occurs, the cutting work must be stopped and the saw blade must be stressed. In severe cases, the saw blade will be scrapped.

[0004] The instability of alloy saw blades is related to the processing and cutting work of the saw blades. The instability of the saw blade actually occurs on the substrate. The fundamental reason is that the tangential compressive stress in the middle of the circular substrate exceeds the critical stress σlj at this position. The critical stress σlj at any radius r of the saw blade is proportional to the square of the ratio of the substrate thickness t to r, and is proportional to the elastic modulus of the substrate material.

[0005] During the production process of saw blades, the substrate must undergo heat treatment, tooth welding, polishing and other processes, all of which will generate tangential compressive stress on the substrate. During the saw blade cutting process, the external cutter head of the saw blade impacts and rubs against the cutting object, generating a large amount of heat. This heat causes the temperature of the outer surface of the saw blade to rise and gradually conducts to the center of the saw blade. In this way, a state of high external temperature and low internal temperature is formed on the substrate, which is reflected in a certain temperature gradient. This temperature gradient leads to the generation of new tangential compressive stress. After the superposition of multiple tangential compressive stresses, if the critical stress is exceeded, the saw blade will become unstable and deformed.

[0006] In order to prevent the saw blade from becoming unstable and deforming, three solutions are formed. One is to increase the stiffness of the base, another is to release the tangential compressive stress, and the third is to preset stress - stress adjustment.

[0007] The current methods for solving the distortion of saw blades have the following problems:

[0008] The main method to increase the rigidity of the substrate is to increase the thickness of the substrate or to increase the strength of the substrate material. This method will undoubtedly increase the production cost of the saw blade and is limited by the use conditions. For example, when cutting some precious materials, the saw path is not allowed to be too wide. The strength of each substrate material has a limit. The stress adjustment method requires dedicated expensive equipment, and the preset pressure will change over time and with the use of the saw blade, and it is not stable. In contrast, stress release is an economical, practical, stable and reliable method. Because stress release is to make a slit or air hole in the middle of the substrate, where the slit is a special case of the air hole, to release the tangential compressive stress, it has a uniform release effect on the tangential compressive stress generated in various links.

[0009] In the time application process of stress release method, insufficient stress release occurs. There are several reasons:

[0010] 1, because the location of the vent does not correspond to the location of the larger tangential compressive stress.

[0011] 2. The radial size of the air hole does not cover the area where the tangential compressive stress exceeds the critical stress, or the radial shape of the air hole is not conducive to the release of the tangential compressive stress.

[0012] 3. The circumferential size and number of the air holes are unreasonable, resulting in insufficient release of the tangential compressive stress at non-air hole locations.

[0013] 4. The shape and size of the air holes cause insufficient strength of the matrix.

[0014] 5. The shape and size of the air holes cause stress concentration. Utility Model Content

[0015] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the utility model is: to provide an olive-shaped air hole alloy saw blade, and to design a new air hole structure to prevent the saw blade from becoming unstable and deforming during cutting.

[0016] In order to solve the above problems, the utility model adopts the following technical solutions:

[0017] An olive-shaped air hole alloy saw blade comprises a base and a cutter head; a chip groove is provided on the base, a concave platform is provided on one side of the chip groove, and the cutter head is welded on the concave platform; the characteristic is that an olive-shaped air hole is provided in the middle of the base; the number of the air holes is greater than or equal to two, and the air holes are evenly distributed along the center of the base.

[0018] Furthermore, the air hole is composed of two semi-ellipses with overlapping major axes; 1 / 2 of the major axis of the ellipse close to the outer circle of the base is C1, and 1 / 2 of the major axis of the ellipse close to the center of the base is C2, C2≥C1, C2:C1=(3~2) / 2; the size of the minor axis is B, B:(C1+C2)=0.25~0.75, and the major axis of the ellipse is arranged radially along the base.

[0019] Furthermore, the distance between the outermost vertex of the ellipse outside the air hole and the bottom circle of the chip groove of the base is L, 10%*D2≤L≤20%*D2; the distance between the innermost vertex of the ellipse inside the air hole and the center of the base is L1, 15%*D2≤L1≤25%*D2; D2 is the diameter of the bottom circle of the chip groove.

[0020] Furthermore, the number of the air holes is n, and n is determined by the length of the solid arc ⌒BC on the distribution circle where the centers of two adjacent air holes are located, ⌒BC=(15~40)t, and t is the thickness of the substrate.

[0021] Furthermore, the angle between the center line of the air hole and the center line of the base is α, -20°≤α≤20°.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] 1. The olive-shaped air hole is closer to a fan shape, which is beneficial to the uniformity of the tangential strain in the radial direction and improves the additional tangential stress caused by the uneven tangential strain in the radial direction; the curvature radius of the radial edge of the olive-shaped air hole is larger, which makes the circumferential compressive stress release more thoroughly and increases the release area of ​​the circumferential compressive stress at the same time, and the effect of eliminating the distortion of the saw blade is more obvious; the short axis of the air hole of the utility model is arranged roughly perpendicular to the diameter direction, and the radial strength of the base is guaranteed under the premise of fully releasing the tangential compressive stress.

[0024] 2. The location of the air holes is accurately set to coincide with the area where the tangential compressive stress of the substrate is larger, so that the stress is released more fully while ensuring the radial strength of the substrate.

[0025] 3. The number of air holes ensures the circumferential strength of the base.

[0026] 4. The angle setting of the air hole ensures that the major axis is basically the same as the radial direction, ensuring the effect of releasing the tangential compressive stress. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is the front view of the utility model;

[0028] Figure 2 for Figure 1 A magnified view of point I;

[0029] Figure 3 This is a schematic diagram of the structure of Example 2.

[0030] In the accompanying drawings,

[0031] 1-base, 2-cutter head, 11-air hole, 12-chip groove. DETAILED DESCRIPTION

[0032] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0033] Example 1

[0034] like Figure 1-2 As shown,

[0035] An olive-shaped air hole alloy saw blade comprises a base 1 and a carbide cutter head 2; a chip groove 12 is provided on the base 1, a concave platform is provided on one side of the chip groove 12, and the cutter head 2 is welded on the concave platform; an olive-shaped air hole 11 is provided in the middle of the base 1; the number of the air holes 11 is greater than or equal to two, and the air holes 11 are evenly distributed along the center of the base 1.

[0036] like Figure 1-2 As shown, the air hole 11 is composed of two semi-ellipses with overlapping long axes; 1 / 2 of the long axis of the ellipse close to the outer circle of the base 1 is C1, and 1 / 2 of the long axis of the ellipse close to the center of the base 1 is C2, C2≥C1, C2:C1=(3~2) / 2; the size of the short axis is B, B:(C1+C2)=0.25~0.75, and the long axis of the ellipse is arranged radially along the base 1. The center of the ellipse close to the center of the base 1 is located on a circle with a diameter of D3;

[0037] The distance between the outermost vertex of the ellipse outside the air hole 11 and the bottom circle of the chip groove 12 of the base 1 is L, 10%*D2≤L≤20%*D2; the distance between the innermost vertex of the ellipse inside the air hole 11 and the center of the base 1 is L1, 15%*D2≤L1≤25%*D2; D2 is the diameter of the bottom circle of the chip groove 12.

[0038] The position of the air hole 11 is optimized by taking into account the position where the thermal stress of the saw blade is released when the saw blade is cutting.

[0039] like Figure 1 As shown, the number of the air holes 11 is n, and n is determined by the solid arc length ⌒BC on the distribution circle where the centers of two adjacent air holes are located, ⌒BC=(15-40)t, and t is the thickness of the substrate 1; the number of air holes 11 affects the speed of stress release, and the more the number, the faster the stress release, but the air holes 11 also affect the strength of the substrate 1, and the more the number of air holes 11, the lower the strength of the substrate. In order to balance stress release and strength, in practice, the solid arc length ⌒BC is most appropriately 25t, which takes into account both stress release and the strength of the substrate 1.

[0040] The air hole 11 and the chip groove 12 are made by stamping process, which is low in cost.

[0041] Example 2

[0042] The structure of this embodiment is basically the same as that of embodiment 1.

[0043] The difference is that, Figure 3 As shown,

[0044] The included angle between the center line of the air hole 11 and the center line of the base 1 is α, -20°≤α≤20°.

[0045] By setting the angle α, it was found that the time for the saw blade base to become unstable and deform can be increased during use. For example, when the angle was not set, the saw blade cut continuously for 250 meters and then became unstable. After the angle was set, it became unstable after about 350 meters. This has positive significance because the inclined air holes can release stress more easily when the saw blade rotates.

[0046] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An olive-shaped air hole alloy saw blade, comprising a base (1) and a cutter head (2); the base (1) is provided with a chip groove (12), one side of the chip groove (12) is provided with a concave platform, and the cutter head (2) is welded on the concave platform; the characteristics are as follows: An olive-shaped air hole (11) is provided in the middle of the base (1); the number of the air holes (11) is greater than or equal to two, and the air holes (11) are evenly distributed along the center of the base (1); The air hole (11) is composed of two semi-ellipses whose major axes overlap; 1 / 2 of the major axis of the ellipse close to the outer circle of the base (1) is C1, and 1 / 2 of the major axis of the ellipse close to the center of the base (1) is C2, C2 ≥ C1, C2: C1 = (3 to 2) / 2; the size of the minor axis is B, B: (C1 + C2) = 0.25 to 0.75, and the major axis of the ellipse is arranged along the radial direction of the base (1); The distance between the outermost vertex of the ellipse outside the air hole (11) and the bottom circle of the chip groove (12) of the base (1) is L, 10%*D2≤L≤20%*D2; the distance between the innermost vertex of the ellipse inside the air hole (11) and the center of the base (1) is L1, 15%*D2≤L1≤25%*D2; D2 is the diameter of the bottom circle of the chip groove (12); The number of the air holes (11) is n, where n is determined by the length of the solid arc ⌒BC on the distribution circle where the centers of two adjacent air holes are located, ⌒BC=(15-40)t, where t is the thickness of the substrate (1); The included angle between the center line of the air hole (11) and the center line of the base (1) is α, and -20°≤α≤20°.

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