Hard alloy saw blade with parallelogram tool bits

Abstract

The utility model relates to a parallelogram tool bit hard alloy saw blade which comprises a base body and tool bits, a plurality of chip discharging grooves are evenly distributed in the outer circle of the base body, tooth holders are arranged on one sides of the chip discharging grooves, and the tool bits are brazed on the tooth holders. The tool bit is in a parallelogram shape. The tool bit comprises a front face a, a rear face b, two side faces and a welding face c, and the tooth holder and the welding face c are brazed together. The tooth holder comprises a circumferential welding seat and a radial welding seat, and the circumferential welding seat and the radial welding seat are connected through a first arc; the width of the circumferential welding seat is B1, the thickness of the tool bit is B, and (B-B1) is larger than or equal to 0.2 and smaller than or equal to 0.4; the tool bit has the advantages that the shape of the tool bit is improved to be a parallelogram, the stress mode of a welding seam is improved, the connection strength is increased, and the weight of the tool bit is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of cemented carbide saw blades, in particular to a cemented carbide saw blade with parallelogram cutting heads. Background Art

[0002] A cemented carbide circular saw blade is to evenly distribute and braze a plurality of cemented carbide cutting head blanks along the outer circumference of the base body, and then grind the cutting edges and tool tips on a special grinding machine. The working process of the alloy saw blade is that the saw blade rotates at a high speed, and the tool tips and cutting edges of the alloy cutting heads are used to cut the cutting object.

[0003] Since the cemented carbide cutting head is a superhard material made of a hardening phase WC and a bonding phase Co powder through powder metallurgy technology, and there are great differences in chemical composition and metallographic structure from the base body, fusion welding cannot be used, and hard brazing is mainly adopted. The brazing filler metal has a relatively high silver content (more than 15%), and the shear strength of the weld seam is generally lower than 120 Mpa. Therefore, the shedding of the cutting head during actual cutting work of the cemented carbide saw blade is a common quality problem. Content of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a cemented carbide saw blade with parallelogram cutting heads, which improves the welding strength by changing the shape of the cutting head and tries to avoid the shedding of the cutting head during work.

[0005] To solve the above problems, the utility model adopts the following technical solutions:

[0006] A cemented carbide saw blade with parallelogram cutting heads includes a base body and cutting heads. A plurality of chip removal grooves are evenly arranged on the outer circumference of the base body. A tooth seat is arranged on one side of the chip removal groove, and the cutting head is brazed on the tooth seat; the cutting head is in a parallelogram shape; the cutting head includes a front face a, a rear face b, two side faces and a welding face c, and the tooth seat is brazed together with the welding face c.

[0007] Further, the tooth seat includes a circumferential welding seat and a radial welding seat, and the circumferential welding seat and the radial welding seat are connected by a first arc; the width of the circumferential welding seat is B1, and the thickness of the cutting head is B, and 0.2 ≤ (B - B1) ≤ 0.4.

[0008] Further, the welding face c of the cutting head includes a vertical welding face and a circumferential welding face; the vertical welding face and the circumferential welding face are transitioned by a second arc; the radius of the second arc is equal to the radius of the first arc.

[0009] Further, the wedge angle of the cutting head is α; the angle between the radial welding seat of the base body and the vertical direction is equal to the wedge angle α.

[0010] Further, the clearance angle of the cutting head is β; β is 10 - 15 degrees.

[0011] The beneficial effects of the present utility model are as follows:

[0012] By providing a parallelogram cutting head and a cutter seat adapted thereto, the welding strength is increased, and at the same time, the length of the cutting head is shortened. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is the main schematic front view of the structure of the present utility model;

[0014] Figure 2 is Figure 1 the enlarged view at I of

[0015] Figure 3 is the cross-sectional view of the cutter Figure 1 at D-D;

[0016] Figure 4 is the three-dimensional structure schematic diagram of the cutting head from another angle;

[0017] Figure 5 is the structure schematic diagram of the cutting head;

[0018] Figure 6 is the force diagram of the parallelogram cutting head;

[0019] Figure 7 is the equivalent force diagram of the parallelogram cutting head;

[0020] Figure 8 is the force diagram of the trapezoidal cutting head before improvement;

[0021] Figure 9 is the equivalent force diagram of the trapezoidal cutting head before improvement;

[0022] Figure 10 is the three-dimensional structure schematic diagram of a part of the substrate;

[0023] Figure 11 is the main view of a part of the substrate.

[0024] Explanation of the reference numerals in the drawings:

[0025] 1 - Substrate, 2 - Cutting head, 3 - Chip removal groove, 4 - Tooth seat;

[0026] 21 - Vertical welding surface, 22 - Circumferential welding surface, 41 - Circumferential welding seat, 42 - Radial welding seat. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The following will describe in clear and complete detail the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. The described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present utility model.

[0028] Embodiment

[0029] As Figure 1 shown in FIGS. - 11,

[0030] A parallelogram - tipped cemented carbide saw blade includes a substrate 1 and cutting tips 2. A plurality of chip - discharging grooves 3 are evenly distributed on the outer circumference of the substrate 1. A tooth base 4 is provided on one side of the chip - discharging groove 3, and the cutting tip 2 is brazed on the tooth base 4.

[0031] The cutting tip 2 is parallelogram - shaped. The cutting tip 2 includes a rake face a, a flank face b, two side faces, and a welding face c, and the tooth base 4 is brazed together with the welding face c.

[0032] The tooth base 4 includes a circumferential welding base 41 and a radial welding base 42. The circumferential welding base 41 and the radial welding base 42 are connected by a first arc. The width of the circumferential welding base 41 is B1, and the thickness of the cutting tip 2 is B, where 0.2 ≤ (B - B1) ≤ 0.4.

[0033] The welding face c of the cutting tip 2 includes a vertical welding face 21 and a circumferential welding face 22. The vertical welding face 21 and the circumferential welding face 22 are transitioned by a second arc. The radius of the second arc is equal to the radius of the first arc, so that the cutting tip 2 can be firmly brazed with the tooth base of the substrate 1, and the cutting tip is evenly stressed during cutting.

[0034] The wedge angle of the cutting tip 2 is α. The angle between the radial welding base 42 of the substrate 1 and the vertical direction is equal to the wedge angle α. The size of the wedge angle has a direct impact on chiseling. The larger the wedge angle, the higher the strength of the cutting part, but the greater the chiseling resistance. Therefore, when selecting the size of the wedge angle, a relatively small value should be taken as much as possible while ensuring sufficient strength of the cutting tip; generally, it is 5 - 8 degrees.

[0035] The clearance angle of the cutting tip 2 is β. The β is 10 - 15 degrees to ensure that the tool does not rub against the workpiece during cutting.

[0036] As Figures 6 - 9 shown, in the force - bearing situation of the cutting tip 2 during cutting, the parallelogram - shaped cutting tip can improve the force - bearing of the weld, change the weld from tensile stress to compressive stress, and the formed equivalent moment prevents the separation of the cutting tip 2 from the substrate 1, thereby improving the welding strength between the cutting tip 1 and the substrate 2.

[0037] The forces acting on the two tooth tips of the improved tool bit can be simplified as Fi and Fj. According to the deformation form of the tool bit 2, it can be simplified into a force model with the fulcrum at O. From Figure 9 it can be seen that the normal stress Pσi on the bottom edge of the existing tool bit is tensile stress.

[0038] The normal stress Pσi on the bottom edge of the parallelogram tool bit 2 is compressive stress, and the moment about point O is counterclockwise, which is the moment to prevent the tool bit from falling off. During the actual working process, when the parallelogram tool bit 2 rotates clockwise around point O, it is blocked by the matrix 1. The Pσi received by the parallelogram tool bit 2 is much greater than that of the existing trapezoidal tool bit. At the same time, the compressive strength of the actual brazed joint is much greater than the tensile strength, so the bonding force between the tool bit 2 and the matrix 1 is improved.

[0039] The above is only the preferred specific implementation mode of the present invention; however, the protection scope of the present invention is not limited thereto; any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its improved concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

[0040] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

Claims

1. A parallelogram carbide saw blade, comprising a substrate (1) and cutting heads (2). A plurality of chip discharge grooves (3) are evenly arranged on the outer circumference of the substrate (1). A tooth seat (4) is provided on one side of the chip discharge groove (3). The cutting head (2) is brazed on the tooth seat (4); characterized in that, The cutting head (2) is a parallelogram; the cutting head (2) includes a front face a, a rear face b, two side faces, and a welding face c, and the tooth seat (4) is brazed to the welding face c.

2. A parallelogram carbide saw blade according to claim 1, characterized in that: The tooth seat (4) includes a circumferential welding seat (41) and a radial welding seat (42), and the circumferential welding seat (41) and the radial welding seat (42) are connected by a first arc; the width of the circumferential welding seat (41) is B1, the thickness of the cutting head (2) is B, and 0.2 ≤ (B - B1) ≤ 0.

4.

3. A parallelogram carbide saw blade according to claim 2, characterized in that, The welding face c of the cutting head (2) includes a vertical welding face (21) and a circumferential welding face (22); the vertical welding face (21) and the circumferential welding face (22) are transitioned by a second arc; the radius of the second arc is equal to the radius of the first arc.

4. A parallelogram carbide saw blade according to claim 3, wherein: The wedge angle of the cutting head (2) is α; the angle between the radial welding seat (42) of the substrate (1) and the vertical direction is equal to the wedge angle α.

5. A parallelogram carbide saw blade according to claim 1, characterized in that, The clearance angle of the cutting head (2) is β; β is 10 - 15 degrees.

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