A flattening carbide saw blade

Abstract

The present application relates to a flattening carbide saw blade, comprising a base body provided with a chip groove, normal teeth welded in the chip groove of the base body and a flattening cutter head, wherein the flattening cutter heads are evenly distributed between the normal teeth; the number of the flattening cutter heads on each saw blade accounts for 1 / 15-1 / 10 of the total number of teeth, and the number of the flattening cutter heads is at least two; the flattening cutter head comprises a rear blade face, a front blade face, two side blade faces and a welding face for flattening; the rear blade face is an inclined arc surface; the top end of the front blade face is a semicircular structure, and its diameter is T+2δ; δ=0.1-0.25mm; the front blade face is parallel to the welding face; the beneficial effects of the present application are: the flattening carbide saw blade can be exempted from woodworking processing such as planing and sanding by arranging a plurality of flattening cutter heads, so as to obtain a cutting section with a smooth and flat surface and no scratches, thereby improving the efficiency of wood cutting and reducing costs.

Description

Technical Field

[0001] The present application relates to the field of cemented carbide circular saw blades, and in particular to a trimming type cemented carbide saw blade. Background Art

[0002] Carbide circular saw blades are generally used for cutting various natural woods, artificial boards, non-ferrous metal materials and their alloys, ferrous metals, composite color steel plates, plastic rubber and other polymer materials;

[0003] The most traditional cutting object of carbide circular saw blades is wood, including natural wood and artificial boards. After years of development, the tooth type and geometric parameters of carbide circular saw blades for wood have been basically solidified, so the cutting efficiency, blade life, and cut section quality are also relatively solidified. Since cutting efficiency and blade life are highly valued, they have been improved rapidly, but there is still a big gap between the cut section quality and the demand for wood processing.

[0004] The current solution is to use a planer blade with planer teeth. Although the cut section is greatly improved, there are still visible scratches on the cut section. It is necessary to use a professional panel to paste it into a veneer, which is the current practice of most people. Another method is to plan and sand the wood after cutting with a saw blade to make the wood surface meet the quality requirements of the panel;

[0005] The above two methods of removing tooth scratches require reprocessing, which wastes resources.

[0006] In the existing patent, application number 201921462577.9, named as an alloy circular saw blade with a scraper, discloses a circular saw blade body, the surface of the circular saw blade body is provided with cutting teeth, the top and bottom of the circular saw blade body are provided with drainage grooves, the left side of the inner wall of the drainage groove is provided with an installation groove, and the interior of the drainage groove is provided with a scraper; it has the advantages of the scraper being removable, replaceable and trimmed, thereby increasing the service life of the circular saw blade and reducing resource consumption. The scraper has the effect of trimming the cutting surface, but the use of the scraper will reduce the strength of the substrate and cause the substrate to deform quickly. Summary of the invention

[0007] The technical problem to be solved by the present application is to provide a flattening carbide saw blade, which improves the flatness and smoothness of the cross-section of the cut object, has no sawtooth scratches, and is exempt from planing and sanding processes, and can be directly used for the panels of woodworking furniture and other products.

[0008] To solve the above problems, this application adopts the following technical solutions:

[0009] A flattening carbide saw blade, comprising a base body provided with a chip groove, normal teeth welded in the chip groove of the base body, and flattening heads, wherein the flattening heads are evenly distributed between the normal teeth; the number of the flattening heads on each saw blade accounts for 1 / 15 to 1 / 10 of the total number of teeth, and the number of the flattening heads is at least two;

[0010] The normal teeth include left teeth and right teeth. The maximum outer diameter of the tip of the normal teeth on the saw blade is D. The diameter at the center of the thickness direction of the normal teeth is D1, where D1=DT*tgβ1.

[0011] T is the width of the saw path, β1 is the back edge angle of the normal tooth; the maximum outer diameter of the tip of the trimming cutter head on the saw blade is D2, D2=D1-2λ.

[0012] The flattening cutter head comprises a flank face for flattening, a rake face, two side faces and a welding face; the flank face is an inclined cambered face.

[0013] Further, the top of the rake face is a semicircular structure, and its diameter is T+2δ; wherein T is the width of the saw path, δ is the single-sided flattening amount of the flattening cutter head, δ=0.1-0.25mm; the top of the welding surface opposite to the rake face is an arc, and its diameter is the same as the semicircle of the top of the rake face; the rake face is parallel to the welding surface;

[0014] The middle section of the front cutting edge is a rectangular structure, the upper end of the rectangle is connected to the semicircle, and the two vertical edges are tangent to the semicircle at the upper end.

[0015] Furthermore, the wedge angle between the rake face and the flank face is η, 55°≤η≤65°;

[0016] The length of the flattening cutter head is L2, L2=L-λ; L is the length of the normal tooth, λ is the difference between the radius of the coincidence point of the normal tooth cutting edge diameter and the radius of the outermost point of the flattening cutter head, λ=0.5-1.5mm;

[0017] The rake angle α of the flattening cutter head is 12°≤α≤20°, which is the same as that of normal teeth;

[0018] The rake angle α1 of the trimming cutter head is 0°;

[0019] The left and right side angles of the trimming cutter head are the same, both are γ, γ=0°;

[0020] The side clearance angle of the flattening cutter head (3) is γ1, 2°≤γ1≤6°;

[0021] The back angle of the flattening cutter head is β, 10°≤β≤25°.

[0022] Furthermore, the intersections between the two side blade surfaces of the flattening cutter head and the lower end plane of the cutter head are rounded, and the fillet radius R3=0.2-0.3mm.

[0023] Furthermore, the base is provided with an expansion joint for preventing the saw blade from being deformed by heat during cutting, the expansion joint is communicated with the bottom of the chip groove, the number of the expansion joints is not less than two, and the expansion joints are evenly distributed along the circumference of the base.

[0024] The beneficial effects of this application are:

[0025] The semicircular top of the rake face of the trimming cutter head is tangent to the two sides of the cutter face, with a smooth transition and no sharp corners, ensuring that the trimming cutter head will not leave scratches on the surface of the material after cutting;

[0026] The setting of the single-side leveling amount δ of the leveling cutter head is determined based on the experience of the depth of residual scratches left by conventional alternating tooth alloy saw blades. If the leveling amount is too large, although the scratches can be leveled, the resistance to the leveling cutter head is too large, which will have a significant impact on the sharpness of the saw blade.

[0027] The length of the flattening cutter head is set to ensure that the normal teeth contact the cutting material before the flattening cutter head, giving full play to the high cutting ability of the flattening cutter head tooth tip. The flattening cutter head is only responsible for flattening and finishing the surface of the normal teeth after cutting;

[0028] After the flattening cutter head is welded, the back is not ground because the surface roughness Ra of the cutter head blank is less than 0.16 and the geometric dimension accuracy is above level 6, which can fully ensure that the cutting requirements can be met without grinding;

[0029] The trimming carbide saw blade can be equipped with a number of trimming heads to avoid woodworking processes such as planing and sanding, and obtain a smooth and flat surface without scratches, thereby improving wood cutting efficiency and reducing costs. The number of trimming heads is set to ensure the quality of the cutting surface without significantly reducing the cutting efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the three-dimensional structure of the flattening cutter head of this application;

[0031] Figure 2 This is a schematic diagram of the three-dimensional structure of the flattening cutter head of the present application from another angle;

[0032] Figure 3 This is the front view of the trimming cutter head;

[0033] Figure 4 It is the right side view of the trimming cutter head;

[0034] Figure 5 This is the left side view of the trimming cutter head;

[0035] Figure 6 A top view of the trimming cutter head;

[0036] Figure 7It is a schematic diagram of the structure of a flattening carbide saw blade;

[0037] Figure 8 It is a left side sectional view of a flattening carbide saw blade;

[0038] Fig. 9 for Figure 7 A magnified view of point I;

[0039] Fig.10 for Figure 7 AA and Fig. 9 Position relationship diagram of the cross-sectional views at CC and DD;

[0040] Fig.11 for Fig. 9 Cross-sectional view at GG;

[0041] Fig.12 for Fig. 9 EE section view;

[0042] Fig.13 for Fig. 9 FF section view;

[0043] Fig.14 It is a schematic diagram of the three-dimensional structure of the flattening cutter head of Example 2;

[0044] The numbers in the figure are

[0045] 1-base, 11-expansion joint;

[0046] 2-normal tooth, 21-right tooth, 22-left tooth;

[0047] 3- flattening blade head, 31- back blade surface, 32- front blade surface, 33- side blade surface, 34- welding surface. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application; the described embodiments are only part of the embodiments of the present application, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field without creative work based on the embodiments in the present application shall fall within the scope of protection of the present application;

[0049] Example 1

[0050] like Figure 1 —14,

[0051] A flattening tool head includes a flank face 31 for flattening, a rake face 32, two side facets 33 and a welding face 34; the flank face 31 is an inclined arc face. A side opposite to the flank face 31 is a bottom face, and a circular arc transition is formed between the bottom face and the welding face 34, and the circular arc R2 is adapted to the circular arc of the tooth seat on the base 1; the lower half of the welding face 34, the bottom face and the circular arc R2 are firmly welded to the tooth seat on the base 1.

[0052] The thickness between the two side surfaces 33 should be greater than the width T of the saw path, so that the trimming cutter head 3 can grind away the scratches formed by the normal teeth 2 during cutting, thereby ensuring the smoothness of the cut surface of the object being cut.

[0053] like Figure 8 As shown, saw path is a professional term in the carbide saw blade industry, which is defined as the distance between the two blade tips of the left tooth 22 and the right tooth 21 in the normal tooth 2 in the axial direction of the saw blade, that is, the distance between the two blade tips projections;

[0054] The detailed structure is that the top of the rake face 32 is a semicircular structure, and its diameter is T+2δ; wherein T is the width of the normal sawing path of the tooth 2, and δ is the single-sided flattening amount of the flattening cutter head 3;

[0055] δ=0.1-0.25mm; the top of the welding surface 34 opposite to the rake face 32 is arc-shaped, and its diameter is the same as the semicircle at the top of the rake face 32; the rake face 32 is parallel to the welding surface 34;

[0056] If the value of δ is too small, it cannot eliminate scratches. If the value of δ is too large, the resistance of the saw blade during cutting will increase, affecting the cutting speed (that is, sharpness) of the saw blade. Therefore, δ is given a range. For a saw blade with a diameter of 180, the best δ value given by our product is 0.15mm, which has little effect on the sharpness and life of the saw blade. The general rule for the value of δ is that the larger the diameter of the saw blade, the larger the δ value. This is because the larger the diameter of the saw blade, the greater the vibration of the saw blade during cutting. The δ value of a saw blade with a diameter of 350 is generally 0.25mm.

[0057] The middle section of the front blade 32 is a rectangular structure, the upper end of the rectangle is connected to the semicircle of the back blade 31, and the two vertical edges are tangent to the semicircle at the upper end. The radius of the semicircle is R1, R1=T / 2+δ. That is, the front blade 32 of the leveling cutter head 3, the semicircle at the top is tangent to the blade surfaces 33 on both sides, with a smooth transition without sharp corners, ensuring that the leveling cutter head 3 will not leave scratches on the surface of the material after cutting; T is the width of the normal tooth 2 sawing path, δ is the single-sided leveling amount of the leveling cutter head 3, δ=0.1-0.25mm;

[0058] like Figure 1-3 As shown, the junction between the front cutting surface 32 and the bottom surface is set as an inclined surface, which is to reduce the weight of the cutting head and save costs.

[0059] like Figure 3 As shown, the wedge angle between the front blade face 32 and the back blade face 31 is η, 55°≤η≤65°; the larger the wedge angle, the higher the strength of the cutting part and the greater the chiseling resistance; so the wedge angle should be selected as small as possible while ensuring sufficient strength. The wedge angle of a carbide saw blade head for cutting wood is generally 55-75 degrees. Since the trimming head 3 only plays a trimming role, the force is relatively light, but the sharpness requirement is relatively high. After repeated tests, this application defines the angle as 55-65°.

[0060] The length of the flattening cutter head 3 is L2, L2=L-λ; L is the length of the normal tooth, λ is the difference between the radius of the coincidence point of the normal tooth cutting edge diameter and the radius of the outermost point of the flattening cutter head 3, λ=0.5-1.5mm;

[0061] The length of the flattening cutter head 3 is set to ensure that the normal teeth 2 contact the cutting material before the flattening cutter head 3, giving full play to the high cutting ability of the tooth tip of the flattening cutter head 3. The flattening cutter head 3 is only responsible for flattening and finishing the surface of the normal teeth 2 after cutting.

[0062] The length L2 of the trimming cutter head 3 can also be calculated using the following formula: L2=L-(D-D2) / 2 COSα; the calculation result is close to the above.

[0063] The rake angle α of the flattening cutter head 3 is 12°≤α≤20°, which is the same as that of the normal tooth 2; the position of α refers to Figure 8 ;

[0064] The bevel angle α1 of the front angle of the flattening cutter head 3 is 0°; the position of α1 refers to Fig.11 and Fig.12 ;

[0065] The left and right angles of the trimming cutter head 3 are the same, both are γ, γ=0°; the position of γ is referenced Fig. 9 ;

[0066] like Fig.10 As shown, the side clearance angle of the flattening cutter head 3 is γ1, 2°≤γ1≤6°;

[0067] like Figure 8 As shown, the back angle of the flattening cutter head 3 is β, 10°≤β≤25; the back edge angle is β1, which is a variable on the semicircular arc surface of the back cutter face 31, that is, the angle between the tangent line at any point on the semicircle and the horizontal plane.

[0068] Example 2

[0069] The structure of this embodiment is basically the same as that of embodiment 1.

[0070] The difference is that

[0071] like Fig.14 As shown,

[0072] The cutter head 3 is leveled, and the intersection line between the lower end plane (bottom surface) of the cutter head and the side cutter surface 33 is rounded, and the fillet radius R3 = (0.2-0.3) mm.

[0073] The setting of the rounded corner R3 further ensures that the trimming cutter head 3 will not leave scratches on the material surface, and at the same time, ensures the area for welding with the substrate 1.

[0074] After the flattening cutter head 3 is welded to the substrate 1, the back face 31 is not ground because the surface roughness Ra of the cutter head blank is less than 0.16 and the geometrical dimension accuracy is above level 6, which can fully ensure that the cutting requirement can be met without grinding.

[0075] If there is a higher cutting requirement, the back face 31 of the cutter head blank can be uniformly ground by using a forming grinding wheel, and the back face 31 is no longer ground after the teeth are welded.

[0076] Example 3

[0077] The structure of this embodiment is basically the same as that of embodiment 1.

[0078] The difference is that

[0079] like Figure 7-13 As shown, a flattening carbide saw blade comprises a base 1 provided with a chip groove, normal teeth 2 welded in the chip groove of the base 1, and flattening heads 3, wherein the flattening heads 3 are evenly distributed between the normal teeth 2; the number of the flattening heads 3 on each saw blade accounts for 1 / 15-1 / 10 of the total number of teeth, and the number of the flattening heads 3 is an integer and is at least two, so as to avoid problems with the dynamic balance of the saw blade;

[0080] The number of trimming heads 3 is set to ensure the quality of the cutting surface without significantly reducing the cutting efficiency; the more trimming heads 3 there are, the smoother the cutting surface of the object being cut (that is, the higher the finish), but the lower the sharpness of the saw blade. The number of trimming heads 3 should be set to take into account the finish requirements of the cut surface and the sharpness requirements of the saw blade, that is, the number of trimming heads 3 should be minimized while meeting the finish requirements. Generally, two trimming heads 3 are set for a saw blade with a diameter of 100; 4-6 trimming heads are set for a saw blade with a diameter of 180; the general rule is that the larger the diameter, the more trimming heads 3 there are.

[0081] like Figure 7-9 As shown, the normal tooth 2 includes a left tooth 22 and a right tooth 21. The left tooth 22 and the right tooth 21 have the same structure, except that the rake angle α1 and the rear edge angle β1 of the two teeth are in opposite directions, so that the force is uniform during cutting;

[0082] The various angle parameters of normal tooth 2 are set as follows:

[0083] like Figure 9-13 As shown, the rake angle α of the normal tooth 2 is 12°≤α≤20°; the rake angle α1 is (0-10)°.

[0084] The left and right side angles of the normal tooth 2 are the same, both are γ, γ=(0.5-1.5)°; the side back angle is γ1, 2°≤γ1≤6°.

[0085] The back angle of normal tooth 2 is β, 10°≤β≤25°; the back edge angle is β1, 10°≤β1≤16°.

[0086] The setting of each angle takes into account the requirements of life and sharpness, and is adjusted on the basis of the design specification of the alternating tooth angle, so that the surface scratches after cutting by the normal tooth 2 are shallow, which is more conducive to the leveling and polishing of the leveling cutter head 3.

[0087] The maximum outer diameter of the tip of the normal tooth 2 on the saw blade is D, and the diameter at the center of the thickness direction of the normal tooth 2 is D1, D1=DT*tgβ1, T is the saw path width, β1 is the back edge angle of the normal tooth 2; the maximum outer diameter of the tip of the leveling cutter head 3 on the saw blade is D2, D2=D1-2λ.

[0088] The base 1 is provided with an expansion joint 11 for reducing deformation of the saw blade caused by overheating during cutting. The expansion joint 11 is communicated with the bottom of the chip groove, and the number of the expansion joints 11 is not less than two. The number of the expansion joints 11 should not affect the dynamic balance of the saw blade itself, so the expansion joints 11 are evenly distributed along the circumference of the base 1.

[0089] The expansion joint 11 can absorb the deformation of the saw blade caused by overheating during cutting, which helps to increase the life of the saw blade.

[0090] The above is only a preferred specific implementation method of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed in the present application according to the technical solution and improved ideas of the present application, which should be covered by the protection scope of the present application.

[0091] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

Claims

1. A flattening carbide saw blade, characterized in that: It comprises a base body (1) provided with a chip groove, normal teeth (2) welded in the chip groove of the base body (1), and a flattening cutter head (3), wherein the flattening cutter heads (3) are evenly distributed between the normal teeth (2); the number of the flattening cutter heads (3) on each saw blade accounts for 1 / 15 to 1 / 10 of the total number of teeth, and the number of the flattening cutter heads (3) is at least two; The normal teeth (2) include left teeth (22) and right teeth (21); the maximum outer diameter of the tip of the normal teeth (2) on the saw blade is D, and the diameter of the center of the normal teeth (2) in the thickness direction is D1, where D1=DT*tgβ1, T is the width of the saw path, and β1 is the back edge angle of the normal teeth (2); the maximum outer diameter of the tip of the flattening cutter head (3) on the saw blade is D2, where D2=D1-2λ; λ is the difference between the radius of the coincidence point of the normal tooth cutting edge diameter and the radius of the outermost point of the flattening cutter head (3), λ=0.5-1.5mm; The flattening tool head (3) comprises a flank face (31) for flattening, a rake face (32), two side faces (33) and a welding face (34); the flank face (31) is an inclined arc surface; The top of the rake face (32) is a semicircular structure, and the diameter of the semicircle is T+2δ, wherein T is the width of the saw path, δ is the single-sided flattening amount of the flattening cutter head (3), and δ=0.1-0.25 mm; the top of the welding surface (34) opposite to the rake face (32) is an arc, and its diameter is the same as the semicircle of the top of the rake face (32); the rake face (32) is parallel to the welding surface (34); The middle section of the front blade surface (32) is a rectangular structure, the upper end of the rectangle is connected to the semicircle, and the two vertical edges are tangent to the semicircle at the upper end.

2. A flattening carbide saw blade according to claim 1, characterized in that: The wedge angle between the front cutting surface (32) and the rear cutting surface (31) is η, 55°≤η≤65°; The length of the flattening cutter head (3) is L2, L2=L-λ; L is the length of the normal tooth, and the front angle α of the flattening cutter head (3) is 12°≤α≤20°, which is the same as that of the normal tooth (2); The rake angle α1 of the flattening cutter head (3) is 0°; The left and right side angles of the flattening cutter head (3) are the same, both are γ, γ=0°; The side clearance angle of the flattening cutter head (3) is γ1, 2°≤γ1≤6°; The back angle of the flattening cutter head (3) is β, 10°≤β≤25°.

3. A flattening carbide saw blade according to claim 2, characterized in that: The intersections between the two side blade surfaces (33) of the flattening blade head (3) and the lower end plane of the blade head are rounded, and the fillet radius R3 is 0.2-0.3 mm.

4. The flattening carbide saw blade according to claim 1, characterized in that: The base body (1) is provided with an expansion joint (11), the expansion joint (11) being in communication with the bottom of the chip groove, the number of the expansion joints (11) being no less than two, and the expansion joints (11) being evenly distributed along the circumference of the base body (1).

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