Cutting-off blade for a lathe, cutting tool and method of using the cutting tool

Abstract

This invention discloses a lathe cutting insert, a cutting tool, and a method of use. The provided lathe cutting insert includes a shank and a head. The intersection of the front of the head with the left and right main back edges forms the left and right main cutting edges, respectively, and the intersection with the left and right secondary back edges forms the left and right secondary cutting edges, respectively. The left secondary cutting edge is higher than the right secondary cutting edge, and the left secondary back edge forms a secondary clearance angle α1 of 0.5° to 2° with the cutting plane. The intersection of the left main back edge and the left secondary back edge, the left main cutting edge, and the left secondary cutting edge forms the first cutting tip. The intersection of the left main back edge and the left secondary back edge, the intersection of the left and right main back edges, and the intersection of the right main back edge and the left secondary back edge forms the second cutting tip. The intersection of the left and right main back edges and the left and right main cutting edges forms the third cutting tip. The intersection of the right main back edge and the left secondary back edge extends from the intersection of the left main back edge and the left secondary back edge in a direction away from the first cutting tip along the direction of the second cutting tip. The lathe cutting insert of this invention has a long service life, smooth chip removal, and directly forms the end face of the product without scratches.

Description

Technical Field

[0001] This invention relates to the field of lathe technology, and in particular to a cutting insert, cutting tool and method of use for a lathe. Background Technology

[0002] Cutting tools are tools used for cutting processes in mechanical manufacturing. The vast majority are machine-operated, but some are hand-operated. Since cutting tools used in mechanical manufacturing are primarily for cutting metal materials, they are generally understood as metal cutting tools. Cutting tools can be classified in several ways. For example, based on the cutting edge movement and corresponding cutting edge shape, they can be divided into general-purpose tools, forming tools, and special-purpose tools. Based on the form of the workpiece surface being machined, they can be classified as tools for machining various external surfaces, hole-machining tools, thread-machining tools, gear-machining tools, and parting-off tools. Tools used for parting-off turning are classified as parting-off tools.

[0003] In existing technologies, parting-off turning typically involves directly fixing a grindable long cutting tool to a tool holder for the cutting operation. If the tool wears out, it is removed for grinding, and then readjusted and reinstalled. Because grinding damages the coating on the tool surface, the tool wear rate accelerates upon reinstallation. Furthermore, unlike other turning operations, parting-off involves a semi-enclosed cutting edge, resulting in high temperatures at the cutting surface that are difficult to conduct to the outside. Therefore, the cutting parameters, especially the cutting speed, should not be too high during parting-off, otherwise, it will accelerate tool tip wear. Secondly, the main cutting edges of the insert are parallel to or nearly parallel to the workpiece axis. This means that when machining actual bar stock, the cutting surface linear velocity gradually approaches zero as the tool approaches the workpiece center. To prevent tool damage, the feed rate must be reduced at the point of near-cutting, ensuring that the cutting edge remains relatively shallow within the material at the moment of cut, preventing the tool from being damaged by the workpiece. Because the main cutting edge is a straight line, when the material is about to break, the machined surface is a small-diameter cylinder. In the end, it is impossible to keep cutting the part with a diameter of zero. When the workpiece is about to break, since there is no stress concentration area in the small cylinder, the break is usually at both ends of the small cylinder. In this way, the cutting tip is easily damaged by the broken material. In addition, the rake face is parallel to the tool body in the radial direction, and the curling direction of the residual chips is no longer restricted. They may also flow to the machined surface of the workpiece, causing scratches. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the main objective of this invention is to provide a lathe cutting insert, a cutting tool, and a method of use. The provided lathe cutting insert has a long service life, smooth chip removal, and can directly form the end face of a product without scratching it.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] This invention provides a cutting insert for a lathe, detachably connected to a tool holder for cutting workpieces. The insert includes a shank and a head. The shank is detachably connected to the tool holder. The head is located at both ends of the shank, and each head has a front end, a left main rear end, a right main rear end, a left secondary rear end, and a right secondary rear end. The intersection of the front end and the left main rear end forms the left main cutting edge; the intersection of the front end and the right main rear end forms the right main cutting edge; the left main cutting edge and the right main cutting edge constitute the main cutting edge; the intersection of the front end and the left secondary rear end forms the left secondary cutting edge, and the intersection of the front end and the right secondary rear end forms the right secondary cutting edge. The left secondary cutting edge is higher than the right secondary cutting edge. The left secondary rear end forms a secondary clearance angle α1 with the cutting plane, and the value of the secondary clearance angle α1 ranges from 0.5° to 2°.

[0007] The intersection of the left main rear edge and the left secondary rear edge, the intersection of the left main blade edge and the left secondary blade edge constitutes the first blade tip; the intersection of the left main rear edge and the left secondary rear edge, the intersection of the left main rear edge and the right main rear edge, and the intersection of the right main rear edge and the left secondary rear edge constitutes the second blade tip; the intersection of the left main rear edge and the right main rear edge, the left main blade edge and the right main blade edge constitute the third blade tip; wherein, the intersection of the right main rear edge and the left secondary rear edge is formed by extending the intersection of the left main rear edge and the left secondary rear edge along the direction of the second blade tip away from the first blade tip.

[0008] As a further description of the above technical solution, the front surface forms a front angle γ with the base surface, and the value of the front angle γ ranges from 5° to 7°.

[0009] As a further description of the above technical solution, the left main rear face forms a left main rear face angle α with the cutting plane. l The left main rear corner α l It is 0°;

[0010] The right rear end and the cutting plane form a right rear end angle α. r The right main rear angle α r The value range is 3° to 6°.

[0011] As a further description of the above technical solution, the cutting width d1 of the left main cutting edge and the cutting width d of the main cutting edge are... t The condition between them satisfies: d t = (4.0~5.0)·d1mm.

[0012] As a further description of the above technical solution, the lathe cutting blade is made of cemented carbide.

[0013] The present invention also provides a lathe cutting tool, employing the lathe cutting insert as described above, comprising:

[0014] A tool holder having a continuous first end and a second end, wherein a groove is provided on one side of the first end;

[0015] A clamping plate is disposed opposite to the upper part of the groove;

[0016] A clamping block is disposed in the groove and connected to the side wall of the groove;

[0017] A cutting blade for a lathe, the cutting blade for a lathe includes a shank and heads disposed at both ends of the shank, the shank being clamped within an accommodating space formed by the groove, the clamping plate and the clamping block; one of the heads extending out of the accommodating space for cutting a workpiece;

[0018] Each of the head sections has a front, a left main rear, a right main rear, a left secondary rear, and a right secondary rear; the intersection of the front and the left main rear forms the left main blade; the intersection of the front and the right main rear forms the right main blade; the left main blade and the right main blade form the main blade; the intersection of the front and the left secondary rear forms the left secondary blade, and the intersection of the front and the right secondary rear forms the right secondary blade, with the left secondary blade being higher than the right secondary blade.

[0019] The intersection of the left main rear edge and the left secondary rear edge, the intersection of the left main blade edge and the left secondary blade edge constitutes the first blade tip; the intersection of the left main rear edge and the left secondary rear edge, the intersection of the left main rear edge and the right main rear edge, and the intersection of the right main rear edge and the left secondary rear edge constitutes the second blade tip; the intersection of the left main rear edge and the right main rear edge, the left main blade edge and the right main blade edge constitute the third blade tip, wherein the intersection of the right main rear edge and the left secondary rear edge extends from the intersection of the left main rear edge and the left secondary rear edge in a direction away from the first blade tip along the direction of the second blade tip.

[0020] As a further description of the above technical solution, the lower wall of the tank gradually protrudes towards the upper wall of the tank from the outside to the inside;

[0021] The clamping block is a wedge.

[0022] As a further description of the above technical solution, the upper surface of the handle abuts against the upper wall of the groove;

[0023] The bottom surface of the handle abuts against the upper end surface of the clamping block.

[0024] The present invention also provides a method for using a lathe cutting tool, employing the lathe cutting tool as described above, as well as a feed clamp and a pick-up clamp, comprising the following steps:

[0025] The material is fed into the cutting station by the feeding clamp, so that the left main cutting edge of the cutting station cuts radially into the material from one side.

[0026] The material is kept stable at the cutting station by the feeding clamp, so that the right main cutting edge at the cutting station gradually cuts into the material along with the left main cutting edge;

[0027] The material is rotated by the feeding clamp, so that the left main cutting edge cuts radially into the material from the other side;

[0028] The material is kept stable at the cutting position by the feeding clamp, so that the right main blade gradually cuts into the material along with the left main blade to complete the cutting of the material and obtain the product.

[0029] As a further description of the above technical solution, in the step of "the material is kept stable at the cutting position by the feeding clamp, and the right main blade gradually cuts into the material along with the left main blade to complete the cutting of the material and obtain the product", before the left main blade cuts to the center of the material, the picking clamp clamps the product to be obtained, and the right main blade continues to gradually cut into the material along with the left main blade to cut the material.

[0030] The outstanding effects of this invention are:

[0031] The lathe cutting insert provided by this invention has a detachable shank that connects to the tool holder, facilitating replacement without the need for re-sharpening. This avoids ineffective wear on the coating on the insert surface, which only gradually peels off during cutting operations, thus extending the insert's lifespan. When installed on the tool holder for cutting operations, the intersection of the left and right main rear edges and the front edge forms the main cutting edge, undertaking the primary cutting work. The front edge, along with the left and right secondary rear edges, respectively, forms the left and right secondary cutting edges, assisting the main cutting edge in completing the cutting work and ultimately forming the machined surface. The left secondary cutting edge is higher than the right secondary cutting edge, and with a suitable rake angle, the blade inclination angle is greater than 0. This causes the chips from the product material to curl and be discharged obliquely backward from the left secondary cutting edge to the right secondary cutting edge, without scratching the cut end face of the product material. The rear of the left secondary cutting edge forms a secondary rear angle α1 of 0.5° to 2° with the cutting plane, which reduces wear on the rear of the left secondary cutting edge and friction between the rear of the left secondary cutting edge and the material, ensuring the smoothness of the cut surface of the material material, eliminating the need for separate finishing.

[0032] The lathe cutting insert provided by this invention has a left rear end that flattens the original cutting tip portion, making it less prone to wear and increasing the strength of the cutting tip, thus extending its overall service life. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the structure of a lathe cutting blade in one embodiment of the present invention;

[0035] Figure 2 This is a front view of a lathe cutting blade according to an embodiment of the present invention;

[0036] Figure 3 This is a right view of a lathe cutting blade according to an embodiment of the present invention;

[0037] Figure 4 This is a top view of a lathe cutting blade according to an embodiment of the present invention;

[0038] Figure 5 This is an exploded view of a cutting tool for a lathe according to one embodiment of the present invention;

[0039] Figure 6 This is a partial schematic diagram of a cutting tool for a lathe in one embodiment of the present invention.

[0040] Figure label:

[0041] 1. Lathe cutting insert; 11. Shank; 12. Head; 121. Front; 122. Left main rear edge; 123. Right main rear edge; 124. Left secondary rear edge; 2. Tool holder; 21. First end; 211. Groove; 22. Second end; 31. Left main cutting edge; 32. Right main cutting edge; 41. Left secondary cutting edge; 42. Right secondary cutting edge; 51. First cutting tip; 52. Second cutting tip; 53. Third cutting tip; 6. Clamping plate; 7. Clamping block; α1. Secondary clearance angle; γ. Front angle; α r Right rear corner; d t d1, the cutting width of the main cutting edge; d2, the cutting width of the left main cutting edge. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] In the description of this invention, it should be noted that the terms "upper," "middle," "lower," "inner," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The embodiments of this invention will now be described according to its overall structure.

[0044] Please see Figures 1 to 6 An embodiment of the present invention discloses a lathe cutting insert, a cutting tool, and a method of use. The disclosed lathe cutting insert 1 is detachably connected to a tool holder 2 for cutting workpieces. It includes a shank 11 and a head 12. The shank 11 is detachably connected to the tool holder 2. The head 12 is located at both ends of the shank 11, and each head 12 has a front end 121, a left main rear end 122, a right main rear end 123, a left secondary rear end 124, and a right secondary rear end 125. The front end 121 and the left main rear end 122... The intersection of the front end 121 and the right main rear end 123 forms the left main cutting edge 31; the intersection of the front end 121 and the right main rear end 123 forms the right main cutting edge 32; the left main cutting edge 31 and the right main cutting edge 32 form the main cutting edge; the intersection of the front end 121 and the left secondary rear end 124 forms the left secondary cutting edge 41, and the intersection of the front end 121 and the right secondary rear end 123 forms the right secondary cutting edge 42, the left secondary cutting edge 41 is higher than the right secondary cutting edge 42; the left secondary rear end 124 and the cutting plane form a secondary clearance angle α1, the value of which is in the range of 0.5° to 2°;

[0045] The intersection of the left main rear edge 122 and the left secondary rear edge 124, the left main blade 31, and the left secondary blade 41 forms the first blade tip 51; the intersection of the left main rear edge 122 and the left secondary rear edge 124, the left main rear edge 122 and the right main rear edge 123, and the right main rear edge 123 and the left secondary rear edge 124 forms the second blade tip 52; the intersection of the left main rear edge 122 and the right main rear edge 123, the left main blade 31, and the right main blade 32 forms the third blade tip 53; wherein, the intersection of the right main rear edge 123 and the left secondary rear edge 124 extends from the intersection of the left main rear edge 122 and the left secondary rear edge 124 along the direction of the second blade tip 52 away from the first blade tip 51.

[0046] With the above structure, the shank 11 of the lathe cutting insert 1 is provided with heads 12 for cutting at both ends, and the shank 11 can be detachably connected to the tool holder 2. After one head 12 wears out, it can be disassembled and reversed. After both heads 12 wear out, the next insert can be replaced. Replacement is convenient and does not require extra resharpening, avoiding ineffective wear on the coating on the surface of the insert. It will only gradually fall off due to cutting work, which also extends the life of the insert. When the lathe cutting insert 1 is installed on the tool holder 2 for cutting work, the intersection line of the left main rear edge 122, the right main rear edge 123 and the front edge 121 together constitutes the main cutting edge to undertake the main cutting work, while the front edge 121, the left secondary rear edge 124 and the right secondary rear edge respectively form the left secondary cutting edge 41 and the right secondary cutting edge 42 to assist the main cutting edge in completing the cutting work and finally forming the machined surface. The left secondary cutting edge 41 is higher than the right secondary cutting edge 42. The material chips will smoothly curl and be discharged from the left secondary cutting edge 41 to the right secondary cutting edge 42. The left secondary rear edge 124 forms a secondary rear angle α1 of 0.5° to 2° with the cutting plane, which reduces the wear on the left secondary rear edge 124 and the friction between the left secondary rear edge 124 and the material, thus ensuring the smoothness of the material cutting surface.

[0047] Meanwhile, since the three vertices of the left main rear 122 are the first cutting tip 51, the second cutting tip 52, and the third cutting tip 53, and the intersection line of the right main rear 123 and the left secondary rear 124 is formed by extending the intersection line of the left main rear 122 and the left secondary rear 124 along the direction of the second cutting tip 52 away from the first cutting tip 51, the left rear cutting surface is located at one corner of the right rear cutting surface, forming a triangle. The first cutting tip 51 will cut into the workpiece first, and the left secondary cutting edge 41 is higher than the right secondary cutting edge 42. The cutting will be curled from the first cutting tip 51 away from the workpiece to be formed, ensuring that the product is cut without scratches.

[0048] Please see Figures 1 to 4 Specifically, in this embodiment, the secondary rear angle α1 is set to 1° to reduce wear on the left secondary rear 124 and friction between the left secondary rear 124 and the material, thus ensuring the smoothness of the material cutting surface.

[0049] Specifically, in this embodiment, the front face 121 forms a front angle γ with the base surface. The value of the front angle γ ranges from 5° to 7°. For example, in this embodiment, the angle of the front angle γ is 6°. That is, the front face 121 is inclined inward from the main cutting edge formed by the left main cutting edge 31 and the right main cutting edge 32 toward the handle 11 with an inclination angle of 6°. Combined with the left secondary cutting edge 41 which is higher than the right secondary cutting edge 42, the blade inclination angle is greater than 0. The front face 121 is obliquely and smoothly concave toward the right secondary cutting edge 42 and the handle 11, which ensures that the material chips curl down from the first blade tip 51 toward the end of the material without scratching the surface of the product during the cutting process.

[0050] Specifically, in this embodiment, the left main rear face 122 forms a left main rear face angle α with the cutting plane. l The left main rear corner α l The angle is 0° (the left rear end is parallel to the cutting plane, therefore the left rear end angle α is not shown in the figure). l The right main rear face 123 forms a right main rear face angle α with the cutting plane. r The right main rear angle α r The value range is 3° to 6°. Therefore, the first blade tip 51 and the second blade tip 52 are located on the same horizontal plane, while the left main blade 31 protrudes beyond the right main blade 32. The left main rear edge 122 acts on the workpiece before the right main blade 32. The left main rear edge 122 as a whole functions as a blade tip; its surface is flat, and the acting blade tip is not a point but a small triangular plane, increasing its strength and slowing down its wear rate. For example, in this embodiment, the left main rear angle α... l Set to 0°, the right main rear angle α r Setting the angle to 5° flattens the blade tip, reducing wear and extending its overall service life.

[0051] Specifically, in this embodiment, the cutting width d1 of the left main cutting edge 31 and the cutting width dt of the main cutting edge satisfy the following relationship: dt = (4.0~5.0)·d1mm. For example, the cutting width d1 of the left main cutting edge 31 can be 0.5mm, which is the width of the left main cutting edge itself. Correspondingly, the cutting width dt of the main cutting edge can be set to 2.25mm. Thus, while ensuring that the blade has sufficient hardness and strength, the narrowest possible cutting width ensures that the length of the corresponding waste section is short enough, thereby reducing material waste and lowering production costs.

[0052] Specifically, in this embodiment, the lathe cutting blade 1 is made of cemented carbide, preferably a fine-particle wear-resistant cemented carbide, which extends its service life.

[0053] Please see Figure 1 , Figure 5 as well as Figure 6 Specifically, this embodiment also discloses a lathe cutting tool, which employs the lathe cutting insert 1 as described above, and includes:

[0054] The tool holder 2 has a continuous first end 21 and a second end 22. A groove 211 is provided on one side of the first end 21 to accommodate the lathe cutting blade 1.

[0055] The clamping plate 6 can be connected to the first end 21 with screws, so that it is positioned opposite to the upper part of the groove 211 to form a receiving gap for receiving the lower part of the blade.

[0056] Clamping block 7 is disposed in the groove 211 and connected to the side wall of the groove 211, so as to cooperate with the clamping plate 6 to limit the lathe cutting blade 1.

[0057] A lathe cutting blade 1 includes a shank 11 and heads 12 at both ends of the shank 11. The shank 11 is clamped in a receiving space formed by the groove 211, the clamping plate 6, and the clamping block 7. The heads 12 extend out of the receiving space to cut the workpiece.

[0058] Each head 12 has a front 121, a left main rear 122, a right main rear 123, a left secondary rear 124, and a right secondary rear; the intersection of the front 121 and the left main rear 122 forms the left main blade 31; the intersection of the front 121 and the right main rear 123 forms the right main blade 32; the left main blade 31 and the right main blade 32 form the main blade; the intersection of the front 121 and the left secondary rear 124 forms the left secondary blade 41, and the intersection of the front 121 and the right secondary rear forms the right secondary blade 42, wherein the left secondary blade 41 is higher than the right secondary blade 42;

[0059] The intersection of the left main rear edge 122 and the left secondary rear edge 124, the left main blade 31, and the left secondary blade 41 forms the first blade tip 51; the intersection of the left main rear edge 122 and the left secondary rear edge 124, the intersection of the left main rear edge 122 and the right main rear edge 123, and the intersection of the right main rear edge 123 and the left secondary rear edge 124 forms the second blade tip 52; the intersection of the left main rear edge 122 and the right main rear edge 123, the left main blade 31, and the right main blade 32 forms the third blade tip 53, wherein the intersection of the right main rear edge 123 and the left secondary rear edge 124 extends from the intersection of the left main rear edge 122 and the left secondary rear edge 124 along the direction of the second blade tip 52 away from the first blade tip 51.

[0060] Specifically, in this embodiment, the clamping plate 6 and the upper part of the groove 211 are arranged opposite to each other to form an accommodating gap, the width of which is slightly larger than the thickness of the lathe cutting blade 1, so that the lathe cutting blade 1 can slide into the gap from the front side.

[0061] Please see Figure 6Specifically, in this embodiment, the lower wall of the groove 211 gradually protrudes towards the upper wall of the groove 211 from the outside in. The clamping block 7 can be a wedge-shaped block, which is connected to the lower wall of the groove 211 along the width direction of the groove 211 using a double-ended screw. After the lathe cutting blade 1 is installed in the groove 211 and the double-ended screw is tightened, the upper surface of the shank 11 of the lathe cutting blade 1 will abut against the upper wall of the groove 211, while the bottom surface of the shank 11 abuts against the upper end face of the clamping block 7, thus limiting its vertical position and preventing it from wobbling left and right in the accommodating gap. At this time, the left secondary cutting edge 41 is located to the lower right of the right secondary cutting edge 42.

[0062] This embodiment also discloses a method for using a lathe cutting-off tool, employing the lathe cutting-off tool as described above, as well as a feed clamp (not shown in the figure) and a pick-up clamp (not shown in the figure), including the following steps:

[0063] The material is fed into the cutting station by the feeding clamp, so that the left main cutting edge 31 of the cutting station cuts radially into the material from one side.

[0064] The material is kept stable at the cutting station by the feeding clamp, so that the right main cutting edge 32 of the cutting station gradually cuts into the material along with the left main cutting edge 31, and its cutting force gradually increases until the material is cut in half radially, and its cutting cross-section is a semicircle.

[0065] The material is rotated by the feeding clamp, so that the left main cutting edge 31 cuts radially into the material from the other side;

[0066] The material is kept stable at the cutting position by the feeding clamp, so that the right main cutting edge 32 and the left main cutting edge 31 gradually cut into the material to complete the cutting of the material and obtain the product. At this time, the material and the product are completely separated.

[0067] Specifically, in this embodiment, in the step "the material is stabilized at the cutting position by the feeding clamp, and the right main cutting edge 32 gradually cuts into the material along with the left main cutting edge 31 to complete the cutting of the material and obtain the product", before the left main cutting edge 31 cuts to the center of the material, the picking clamp clamps the product to be obtained. Subsequently, as the cutter continues to advance, the right main cutting edge 32 continues to gradually cut into the material along with the left main cutting edge 31 to cut the material. The cutting force gradually decreases, and the cutting is also prevented from breaking during cutting.

[0068] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any changes, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A cutting blade for a lathe, detachably connected to a tool holder, for cutting workpieces, characterized in that, It includes a shank and a head, the shank being detachably connected to the tool holder; The heads are located at both ends of the handle, and each head has a front, a left main rear, a right main rear, a left secondary rear, and a right secondary rear. The intersection of the front and the left main rear forms the left main cutting edge; the intersection of the front and the right main rear forms the right main cutting edge; the left main cutting edge and the right main cutting edge constitute the main cutting edge; the intersection of the front and the left secondary rear forms the left secondary cutting edge, and the intersection of the front and the right secondary rear forms the right secondary cutting edge. The left secondary cutting edge is higher than the right secondary cutting edge; the left secondary rear forms a secondary back angle with the cutting plane. The secondary rear corner The value range is 0.5° to 2°; The intersection of the line between the rear of the left main blade and the rear of the left secondary blade, the intersection of the left main blade and the left secondary blade, constitute the first blade tip; The intersection of the lines connecting the left main rear and the left secondary rear, the lines connecting the left main rear and the right main rear, and the lines connecting the right main rear and the left secondary rear constitutes the second blade tip; the lines connecting the left main rear and the right main rear, the left main blade edge, and the right main blade edge constitute the third blade tip; wherein, the line connecting the right main rear and the left secondary rear is formed by extending the line connecting the left main rear and the left secondary rear along the direction of the second blade tip away from the first blade tip; The front face forms a front angle γ with the base plane, and the value of the front angle γ ranges from 5° to 7°; the left main rear face forms a left main rear face angle with the cutting plane. The left rear corner The angle is 0°; the right rear face forms a right rear face angle with the cutting plane. The right rear corner The value range is 3° to 6°.

2. The lathe cutting blade according to claim 1, characterized in that, The cutting width d1 of the left main cutting edge and the cutting width d of the main cutting edge t The following conditions must be met between them: d t =(4.0~5.0)·d1mm.

3. The lathe cutting blade according to claim 1, characterized in that, The cutting blade for the lathe is made of cemented carbide.

4. A lathe cutting tool, employing a lathe cutting insert as described in any one of claims 1 to 3, characterized in that, include: A tool holder having a continuous first end and a second end, wherein a groove is provided on one side of the first end; A clamping plate is disposed opposite to the upper part of the groove; A clamping block is disposed in the groove and connected to the side wall of the groove; A cutting insert for a lathe, the cutting insert for a lathe includes a shank and heads disposed at both ends of the shank, the shank being clamped within an accommodating space formed by the groove, the clamping plate and the clamping block; The head extends out of the receiving space for cutting the material; Each of the aforementioned heads has a front, a left main rear, a right main rear, a left secondary rear, and a right secondary rear; The intersection of the front and the rear of the left main blade forms the left main blade; the intersection of the front and the rear of the right main blade forms the right main blade; the left main blade and the right main blade form the main blade; the intersection of the front and the rear of the left secondary blade forms the left secondary blade, the intersection of the front and the rear of the right secondary blade forms the right secondary blade, and the left secondary blade is higher than the right secondary blade. The intersection of the line between the rear of the left main blade and the rear of the left secondary blade, the intersection of the left main blade and the left secondary blade, constitute the first blade tip; The intersection of the lines connecting the left main rear and the left secondary rear, the lines connecting the left main rear and the right main rear, and the lines connecting the right main rear and the left secondary rear constitutes the second blade tip; the lines connecting the left main rear and the right main rear, the left main blade edge, and the right main blade edge constitute the third blade tip, wherein the line connecting the right main rear and the left secondary rear is formed by extending the line connecting the left main rear and the left secondary rear along the direction of the second blade tip away from the first blade tip.

5. The lathe cutting tool according to claim 4, characterized in that, The lower wall of the tank gradually protrudes towards the upper wall of the tank from the outside inward. The clamping block is a wedge.

6. The lathe cutting tool according to claim 4, characterized in that, The upper surface of the handle abuts against the upper wall of the groove; The bottom surface of the handle abuts against the upper end surface of the clamping block.

7. A method of using a cutting tool for a lathe, characterized in that, The method of using the lathe cutting tool and feed clamp and pick-up clamp as described in any one of claims 4 to 6 includes the following steps: The material is fed into the cutting station by the feeding clamp, so that the left main cutting edge of the cutting station cuts radially into the material from one side. The material is kept stable at the cutting station by the feeding clamp, so that the right main cutting edge at the cutting station gradually cuts into the material along with the left main cutting edge; The material is rotated by the feeding clamp, so that the left main cutting edge cuts radially into the material from the other side; The material is kept stable at the cutting position by the feeding clamp, so that the right main blade gradually cuts into the material along with the left main blade to complete the cutting of the material and obtain the product.

8. The method of using the lathe cutting tool according to claim 7, characterized in that, In the step "the material is stabilized at the cutting position by the feeding clamp, and the right main blade gradually cuts into the material along with the left main blade to complete the cutting of the material and obtain the product", before the left main blade cuts to the center of the material, the picking clamp clamps the product to be obtained, and the right main blade continues to gradually cut into the material along with the left main blade to cut the material.

Images