Indexable inserts and turning tools

Abstract

The present invention belongs to the field of machining tools, and specifically discloses an indexable insert and a turning tool that are conducive to chip discharge. The indexable insert is processed into a cutting portion by opening an arc-shaped groove on a rotating portion formed by extending from the periphery of the insert body toward one side thereof. The cutting portion is equivalent to a structure formed by partially extending the periphery of the insert body outward along the axial direction. During use, the insert body needs to be tilted toward the feed direction to ensure that the cutting portion in the working position is forward beyond other cutting portions. Therefore, during use, the indexable insert has a natural tilt angle, which has a certain guiding effect on the chips flowing out of the front of the cutting portion, and is conducive to curling and discharging the chips in one direction, so that the chips will basically not wrap around the tip of the tool; at the same time, since the arc-shaped groove is opened on the rotating portion, it is conducive to guiding and discharging the chips, so the chips will basically not form accumulations between the front of the cutting portion of the working position cutting portion and the back of the cutting portion of the adjacent cutting portion.

Description

Technical Field

[0001] The invention belongs to the field of machining tools, and in particular relates to an indexable blade and a turning tool. Background Art

[0002] Indexable inserts are inserts that can be used in different positions. They can be of many types, such as thread turning inserts, outer diameter turning inserts, outer diameter groove inserts, end face groove inserts, etc.

[0003] Indexable inserts generally have multiple cutting parts. When one of the cutting parts is worn, the rotatable insert uses another cutting part for cutting. For example, the Chinese utility model patent with the authorization announcement number CN213410682U discloses a vertical thread turning insert, which includes a insert body, a mounting hole and at least two cutting parts on the insert body, and each cutting part is evenly distributed around the mounting hole; the outer contour surface of each cutting part is located on the same revolving curved surface, the axis of the revolving curved surface is the center line of the mounting hole, and the generatrix of the revolving curved surface matches the thread tooth profile; on the circumference of the insert body, one side of the cutting part is the front side of the cutting part, and the other side is the back side of the cutting part, and the intersection of the front side of the cutting part and the outer contour surface is the cutting edge.

[0004] Although the above-mentioned vertically mounted thread turning insert sets the cutting part on the circumference of the insert body, which is convenient for processing, more cutting parts can be produced, and it is easy to ensure the position accuracy of the cutting edge and the tip relative to the center of the insert, its cutting part is equivalent to a structure formed by the local radial extension of the periphery of the insert body, and the angular bisector of the tip angle of the cutting part is perpendicular to the axial line of the insert body. In addition, since the angular bisector of the tip angle of the cutting part must be perpendicular to the axis of the workpiece during thread turning, otherwise the tooth profile will be skewed. Therefore, during the use of the above-mentioned vertically mounted thread turning insert, the axial line of the insert body is kept parallel to the axis of the workpiece, and the insert body has basically no guiding effect on the chips. After the chips generated during cutting flow out along the front of the cutting part, they are easily accumulated between the front of the cutting part of the working position cutting part and the back of the cutting part of the adjacent cutting part, that is, in the chip groove of the insert, resulting in problems such as chips wrapping around the tip, aggravating the wear of the cutting part, and scratching the workpiece, which not only reduces the service life of the insert, but also reduces the processing quality of the workpiece. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide an indexable insert which is conducive to chip discharge.

[0006] The technical solution adopted by the present invention to solve the technical problem is: the indexable insert comprises an insert body, the insert body is provided with a mounting hole and a cutting portion located at the circumference of the mounting hole;

[0007] The cutting portion includes a side profile surface, a front surface of the cutting portion, and a back surface of the cutting portion;

[0008] The peripheral edge of the blade body extends in a direction away from one of the side surfaces of the blade body to form a rotating portion, and the rotating axis of the rotating portion is colinear with the axial center line of the mounting hole;

[0009] At least two arc-shaped grooves are formed on the rotating part, and the protrusion formed between two adjacent arc-shaped grooves is the cutting part;

[0010] The side profile surface of the cutting portion is located on the revolving curved surface of the revolving portion, and the front side and the back side of the cutting portion on the same cutting portion respectively correspond to different arc-shaped grooves.

[0011] Furthermore, there are at least two cutting parts, and the front side of the cutting part and the back side of the cutting part corresponding to the same arc-shaped groove are smoothly transitionally connected through the arc-shaped part.

[0012] Furthermore, the cutting portions are evenly distributed on a circumference centered on the mounting hole.

[0013] Furthermore, the front side of the cutting portion is a plane, and the back side of the cutting portion is an arc-shaped surface.

[0014] Furthermore, the indexable insert is a thread processing insert, the cross section of the rotating portion matches the tooth profile of the thread to be processed, and the taper C of the inner surface of the rotating portion is 内 Greater than the taper C of the outer surface 外 .

[0015] Furthermore, the front face of the cutting portion intersects with the side contour surface to form two main cutting edges, and the angle between the two main cutting edges is the tip angle θ of the cutting portion where they are located, 30°≤θ≤60°.

[0016] The present invention also provides an indexable turning tool that is conducive to chip discharge, which includes a tool bar and a blade mounted on the tool bar, and the blade is the above-mentioned indexable blade;

[0017] A mounting portion is provided at the front end of the tool bar, and the blade is tiltedly arranged on the mounting portion through the blade body, so that the tip of the cutting portion in the working position faces forward and exceeds the tips of other cutting portions, so that other cutting portions do not interfere with the workpiece during the working process.

[0018] Furthermore, the indexable turning tool is a turning tool for thread processing;

[0019] The number of cutting parts is eight, and the angle between the blade body and the axis of the shank is α, α=75°;

[0020] When the cutting part is in the working position, the bisector of the tool tip angle remains parallel to the axis of the tool shank.

[0021] Furthermore, a positioning portion is provided on the blade body, and the positioning portion has a first positioning structure corresponding one-to-one with the cutting portion;

[0022] A second positioning structure is provided on the knife rod;

[0023] The first positioning structure corresponding to the cutting part in the working position is connected in cooperation with the second positioning structure.

[0024] Further, the first positioning structure is a first positioning hole having the same number as the positioning portion;

[0025] The second positioning structure is a second positioning hole;

[0026] The second positioning hole is connected with the corresponding first positioning hole through the positioning piece.

[0027] The beneficial effects of the present invention are:

[0028] 1) The cutting portion is machined by providing an arc-shaped groove on the rotating portion formed by extending from the periphery of the blade body toward one side thereof. The cutting portion is equivalent to a structure formed by partially extending the periphery of the blade body outward along the axial direction. During use, the blade body needs to be tilted toward the feed direction to ensure that the cutting portion in the working position is forward beyond other cutting portions, and ensure that other cutting portions do not interfere with the workpiece. Therefore, the indexable blade has a natural tilt angle during use, which has a certain guiding effect on the chips flowing out of the front of the cutting portion, which is conducive to curling and discharging the generated chips in one direction, so that they basically will not entangle the blade tip; especially When processing threads, because the angle between the bisector of the cutting edge angle of the cutting part and the axis of the blade body is usually less than 45°, the angle between the axis of the blade body and the axis of the workpiece is greater than 45°, which is more conducive to curling the chips in one direction and discharging them smoothly; at the same time, since the arc groove is opened on the rotating part, it is beneficial to guide the chips, so the chips basically will not form accumulation between the front side of the cutting part of the working cutting part and the back side of the cutting part of the adjacent cutting part, further avoiding the problems of chips entangled with the cutting tip, aggravated wear of the cutting part, scratching the workpiece, etc., thereby ensuring the service life and processing quality of the blade.

[0029] 2) When manufacturing the indexable insert, the conical structure and the mounting hole are first processed, and then an arc-shaped groove is opened on the rotating part to process the cutting part. The manufacturing is simple and very suitable for the pressing and demolding of cemented carbide inserts. The structure of the required mold is also relatively simple, without additional complex curved surfaces and positioning devices, and the production cost is low. Moreover, it is conducive to ensuring the position accuracy of the cutting edge and the tip of the blade relative to the center of the blade. In addition, the required matching tool rod is also simple to manufacture.

[0030] 3) Since the cutting portion of the indexable insert is equivalent to a structure formed by a partial extension of the peripheral edge of the insert body axially outward, the cutting portion that is not in the working position during use can be effectively prevented from interfering with the workpiece by controlling the length and inclination angle of the cutting portion. Therefore, the cutting portion can be flexibly set according to actual conditions, and it is beneficial to set more cutting portions to increase the service life of the insert.

[0031] 4) The indexable insert has a wide range of applications and can be used as a thread turning insert, an outer diameter turning insert, an outer diameter groove insert, an end face groove insert, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the implementation structure of the indexable insert in the present invention;

[0033] Figure 2 is a front view of the indexable insert of the present invention;

[0034] Figure 3 is along Figure 2 Sectional view along line AA;

[0035] Figure 4 It is a schematic diagram of the implementation structure of the blade body before the rotary part is provided with an arc-shaped groove;

[0036] Figure 5 It is a side view of the blade body before the arc-shaped groove is formed on the rotating part;

[0037] Figure 6 is along Figure 5 Sectional view along the midline BB;

[0038] Figure 7 It is a schematic diagram of the implementation structure of the indexable turning tool in the present invention;

[0039] Figure 8 is a side view of the indexable turning tool of the present invention;

[0040] Fig. 9 It is a schematic diagram of the implementation structure of the tool bar;

[0041] Fig.10 The working state of the indexable turning tool for processing thread in the present invention is shown in FIG. Figure 1 ;

[0042] Fig.11 The working state of the indexable turning tool for processing thread in the present invention is shown in FIG. Figure 2 ;

[0043] Fig.12 The working state of the indexable turning tool for processing thread in the present invention is shown in FIG. Figure 3 ;

[0044] Fig.13 The working state of the indexable turning tool for processing thread in the present invention is shown in FIG. Figure 4 ;

[0045] Marked in the figure are: blade body 100, mounting hole 110, cutting portion 120, side contour surface 121, front side of cutting portion 122, back side of cutting portion 123, main cutting edge 124, arc portion 125, tool tip 126, angle bisector 127, positioning portion 130, first positioning structure 131, rotating portion 200, rotating axis 210, arc groove 220, rotating surface 230, tool rod 300, mounting portion 310, second positioning structure 320, workpiece 400, chips 500. DETAILED DESCRIPTION

[0046] The present invention will be further described below in conjunction with the accompanying drawings.

[0047] In the description of the present invention, it should be noted that the terms "front", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. The tool tip angle is the angle between the main cutting edge and the secondary cutting edge measured in the base surface. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0048] Combination Figures 1 to 6 As shown, the indexable insert includes an insert body 100, the insert body 100 is provided with a mounting hole 110 and a cutting portion 120 located at the circumference of the mounting hole 110;

[0049] The cutting portion 120 includes a side profile surface 121, a cutting portion front surface 122 and a cutting portion back surface 123;

[0050] The periphery of the blade body 100 extends in a direction away from one of the side surfaces of the blade body 100 to form a rotating portion 200 , and a rotating axis 210 of the rotating portion 200 is colinear with an axial center line of the mounting hole 110 ;

[0051] At least two arc-shaped grooves 220 are formed on the rotating portion 200, and the protrusion formed between two adjacent arc-shaped grooves 220 is the cutting portion 120;

[0052] The side profile surface 121 of the cutting portion 120 is located on the revolution curved surface 230 of the revolution portion 200 , and the cutting portion front surface 122 and the cutting portion back surface 123 on the same cutting portion 120 respectively correspond to different arc-shaped grooves 220 .

[0053] The indexable insert is machined to form a cutting portion 120 by opening an arc-shaped groove 220 on a rotating portion 200 formed by extending from the periphery of the insert body 100 toward one side thereof. The cutting portion 120 is equivalent to a structure formed by partially extending the periphery of the insert body 100 outward along the axial direction. During use, the insert body 100 needs to be tilted in the feed direction to ensure that the cutting portion 120 in the working position extends forward beyond other cutting portions 120, and to ensure that other cutting portions 120 do not interfere with the workpiece 400. Therefore, there is a natural tilt angle during use of the indexable insert, which has a certain guiding effect on the chips 500 flowing out of the front side 122 of the cutting portion, and is conducive to causing the generated chips 500 to curl and discharge outward in one direction, so that they basically will not entangle the tip of the tool. Fig.10 As shown; especially when processing threads, because the angle between the angular bisector 127 of the cutting edge angle of the cutting portion 120 and the axis of the blade body 100 is usually less than 45°, the angle between the axis of the blade body 100 and the axis of the workpiece 400 is greater than 45°, which is more conducive to curling the chips 500 in one direction and discharging them smoothly; at the same time, since the arc groove 220 is opened on the rotating portion 200, it is conducive to guiding and discharging the chips 500, so the chips 500 basically will not form accumulations between the front face 122 of the cutting portion 120 of the working position cutting portion and the back face 123 of the cutting portion 120 of the adjacent cutting portion 120, further avoiding the problems of the chips 500 winding around the cutting edge, aggravating the wear of the cutting portion 120, scratching the workpiece 400, etc., thereby ensuring the service life and processing quality of the blade.

[0054] When manufacturing the indexable insert, the conical structure and the mounting hole 110 are first processed, and then the arc groove 220 is opened on the rotating part 200 to process the cutting part 120. The manufacturing is simple and very suitable for the pressing and demolding of cemented carbide inserts. The structure of the required mold is also relatively simple, without additional complex curved surfaces and positioning devices, and the production cost is low; moreover, it is conducive to ensuring the position accuracy of the cutting edge and the tip relative to the center of the blade; in addition, the required matching tool bar is also simple to manufacture. Different numbers of cutting parts 120 can be obtained by changing the number and shape of the arc grooves 220, and since the cutting part 120 of the indexable insert is equivalent to the structure formed by the peripheral part of the blade body 100 extending outward along the axial direction, by controlling the length and inclination angle of the cutting part 120, the cutting part 120 that is not in the working position during use can be effectively prevented from interfering with the workpiece 400. Therefore, the cutting part 120 can be flexibly set according to actual conditions, and it is conducive to setting more cutting parts 120 to increase the service life of the blade. Figure 1 and Figure 2 The embodiment is a blade having eight cutting portions 120 .

[0055] Among them, the blade body 100 is the base of the indexable blade, which is usually a centrosymmetric structure, preferably a frustum of a cone structure; the mounting hole 110 is a through hole opened on the blade body 100 for connecting with the tool bar 300 or the tool disc; generally, the mounting hole 110 is opened at the central part of the blade body 100, and usually screws, bolts and other connecting parts are passed through the mounting hole 110 to connect the blade body 100 with the tool bar 300 or the tool disc together.

[0056] The cutting part 120 is the structure on the blade body 100 for cutting the workpiece 400; the side profile surface 121 refers to the inner and outer side surfaces of the cutting part 120 and the transition surface between the inner and outer side surfaces; the front surface of the cutting part 122 is the rake face of the cutting part 120, which directly acts on the machined metal layer and controls the chip 500 to be discharged along it; the back surface of the cutting part 123 is the surface on the cutting part 120 on the side opposite to the front surface of the cutting part 122, which can be used to guide the chip 500.

[0057] The indexable blade has a wide range of applications and can be used as a thread turning blade, an outside diameter turning blade, an outside diameter grooving blade, an end face grooving blade, etc. When used for machining triangular threads or "V" - shaped grooves, the front surface of the cutting part 122 intersects with the side profile surface 121 to form a "V" - shaped cutting edge; when used for machining trapezoidal threads or trapezoidal grooves, the front surface of the cutting part 122 intersects with the side profile surface 121 to form a "︹" - shaped cutting edge; when used for machining rectangular threads or rectangular grooves, the front surface of the cutting part 122 intersects with the side profile surface 121 to form a "凵" - shaped cutting edge; when used for machining arc - shaped threads or arc - shaped grooves, the front surface of the cutting part 122 intersects with the side profile surface 121 to form a "∩" - shaped cutting edge; similarly, when used for machining other shaped threads or grooves, the front surface of the cutting part 122 intersects with the side profile surface 121 to form a cutting edge with the corresponding profile shape.

[0058] Preferably, as shown in Figure 1 、 Figure 2 and Figure 3 shown, there are at least two cutting parts 120, and the front surface 122 of the cutting part corresponding to the same arc - shaped groove 220 and the back surface 123 of the cutting part are smoothly connected through an arc - shaped part 125. The arc - shaped part 125 can not only smoothly connect the front surface 122 and the back surface 123 of the cutting part, improve the integrity and strength of the indexable blade, but also guide the chip 500 discharged along the front surface 122 of the cutting part, improving the chip - discharging effect.

[0059] To improve the stability of the indexable blade and the convenience of indexing use, as shown in Figure 2 shown, it is preferred that each cutting part 120 is evenly distributed on the circumference centered on the mounting hole 110.

[0060] In order to further improve the chip removal effect of the indexable insert, Figure 1 and Figure 3 As shown, the front face 122 of the cutting part is set as a plane, and the back face 123 of the cutting part is set as an arc surface. In this way, after the chips 500 discharged from the front face 122 of the cutting part are guided by the arc portion 125, the chips 500 can be further guided by the back face 123 of the cutting part with an arc structure, so that the chips 500 can be rolled along the back face 123 of the cutting part and guided toward the tangent direction of the rotating part 200, and at the same time, the chips 500 can be further curled and discharged in one direction in coordination with the blade body 100 having a natural tilt angle, as shown in FIG. Fig.10 shown.

[0061] The rotary part 200 is a structure in which the cutting part 120 is processed on the blade body 100. Figure 4 and Figure 6 As shown, the rotating part 200 is usually a structure in which the thickness of the rotating part 200 gradually decreases along its own extension direction; the rotating axis 210 is the axis of the rotating part 200, and also serves as the center line around which the indexable insert rotates during the indexing process; the arc-shaped groove 220 is a groove opened on the rotating part 200, and also serves as a blade chip groove, and its curvature is the same as the curvature of the rotating surface 230 of the rotating part 200.

[0062] like Figure 3 As shown, the bottom surface of the arc-shaped groove 220 between any two adjacent cutting parts 120 is mainly composed of the front cutting part 122 of one cutting part 120, the back cutting part 123 of the other cutting part 120, and the arc-shaped part 125 that smoothly transitions and connects the front cutting part 122 and the back cutting part 123 corresponding to each other. It can be seen that the back cutting part 123 is the main part of the bottom surface of the arc-shaped groove 220. Setting the back cutting part 123 as an arc surface is also conducive to making the arc-shaped groove 220 effectively avoid the workpiece 400, preventing other parts of the blade from interfering with the workpiece 400, such as Fig.10 , Fig.11 , Fig.12 and Fig.13 shown.

[0063] As a preferred embodiment of the present invention, Figures 1 to 6 As shown, the indexable insert is a thread processing insert, the cross section of the rotating portion 200 of which matches the tooth profile of the thread to be processed, and the taper C of the inner surface of the rotating portion 200 内 Greater than the taper C of the outer surface 外Since the angle bisector 127 of the tool tip angle of the cutting portion 120 must be perpendicular to the axis of the workpiece 400 during thread turning, in order to facilitate the cutting portion 120 in the working position to extend forward and prevent other cutting portions 120 from interfering with the workpiece 400, it is necessary to make the taper C of the inner surface of the rotating portion 200 内 Greater than the taper C of the outer surface 外 In this way, the angle bisector 127 of the cutting edge angle of the cutting portion 120 can be tilted outwards for ease of use.

[0064] On the basis of the above, in order to facilitate the processing of triangular threads, combined with Figure 3 and Figure 8 As shown, the front face 122 of the cutting part intersects with the side profile surface 121 to form two main cutting edges 124, and the angle between the two main cutting edges 124 is the tool tip angle θ of the cutting part 120 where they are located, 30°≤θ≤60°. Because the front face 122 of the cutting part as a plane is equivalent to the base surface, the angle between the two main cutting edges 124 is the tool tip angle of the cutting part 120 where they are located; preferably, the tool tip angle of the cutting part 120 is 55°.

[0065] The present invention also provides an indexable turning tool, combined with Figures 1 to 8 As shown, it includes a tool bar 300 and a blade mounted on the tool bar 300, and the blade is the above-mentioned indexable blade;

[0066] The front end of the blade bar 300 is provided with a mounting portion 310, and the blade is tiltedly mounted on the mounting portion 310 through the blade body 100, so that the tip 126 of the cutting portion 120 in the working position is forwardly beyond the tips 126 of other cutting portions 120; that is, the tip 126 of the cutting portion 120 in the working position is located in front of the tips 126 of other cutting portions 120; thereby ensuring that other cutting portions 120 do not interfere with the workpiece 400 during the working process. The mounting portion 310 can be of various structures, preferably a half groove adapted to the blade body 100.

[0067] Combination Fig.10 , Fig.11 , Fig.12 and Fig.13 As shown, when the workpiece 400 is processed by the above-mentioned indexable turning tool, it is necessary to check the upper and lower parts of the cutting part 120 in the working position for interference; if interference exists, it is necessary to replace the blade of another size. Fig.13 It can be seen intuitively that the cutting part 120 in the working position cuts the workpiece 400, and the other cutting parts 120 maintain a certain distance from the workpiece 400, especially the two cutting parts 120 adjacent to the working position cutting part 120 above and below.

[0068] Preferably, Figure 8As shown, the indexable turning tool is a turning tool for thread processing;

[0069] The number of the cutting parts 120 is eight, and the angle between the axis of the blade body 100 and the shank (300) is α, α=75°;

[0070] The bisector 127 of the cutting edge angle of the cutting portion 120 in the working position is parallel to the axis of the tool bar 300. This is beneficial to the clamping and use of the indexable turning tool, and ensures its stability, and is beneficial to improving its service life and ensuring processing accuracy.

[0071] In order to facilitate the rapid positioning and fixing of the blade on the blade bar 300 after the indexing adjustment, Figures 7 to 9 As shown, a positioning portion 130 is provided on the blade body 100, and the positioning portion 130 has a first positioning structure 131 corresponding to the cutting portion 120 one by one;

[0072] The knife bar 300 is provided with a second positioning structure 320;

[0073] The first positioning structure 131 corresponding to the cutting part 120 in the working position is connected with the second positioning structure 320. The cooperation between the first positioning structure 131 and the second positioning structure 320 not only facilitates the quick adjustment of the cutting part 120 to the working position, but also prevents the blade body 100 from rotating due to the force applied when the blade is cutting.

[0074] The first positioning structure 131 and the second positioning structure 320 can be of various types, for example, a snap-fit ​​structure, matching protrusions and grooves, positioning pins and positioning holes, and the like.

[0075] In order to facilitate processing and ensure good positioning effect, combined with Figure 7 and Fig. 9 As shown, the first positioning structure 131 is a first positioning hole having the same number as the positioning portion 130;

[0076] The second positioning structure 320 is a second positioning hole;

[0077] The second positioning hole is connected with the corresponding first positioning hole through a positioning piece. The positioning piece can be of various types, such as a set screw, a latch, and the like.

Claims

1. An indexable insert, comprising an insert body (100), wherein the insert body (100) is provided with a mounting hole (110) and a cutting portion (120) located at the circumference of the mounting hole (110); The cutting portion (120) comprises a side profile surface (121), a front surface (122) of the cutting portion and a back surface (123) of the cutting portion; and is characterized in that: The indexable insert is an insert for thread processing; The periphery of the blade body (100) extends in a direction away from one of the side surfaces of the blade body (100) to form a rotating portion (200), and a rotating axis (210) of the rotating portion (200) is colinear with an axial center line of the mounting hole (110); The cross section of the rotating part (200) matches the thread profile of the thread to be processed, and the taper C of the inner surface of the rotating part (200) is 内 Greater than the taper C of the outer surface 外 ; At least two arc-shaped grooves (220) are formed on the rotating portion (200), and the protrusion formed between two adjacent arc-shaped grooves (220) is the cutting portion (120); The side profile surface (121) of the cutting portion (120) is located on the revolving curved surface (230) of the revolving portion (200), and the front surface (122) and the back surface (123) of the cutting portion (120) on the same cutting portion (120) respectively correspond to different arc-shaped grooves (220).

2. The indexable insert according to claim 1, characterized in that: There are at least two cutting parts (120), and the front side (122) of the cutting part and the back side (123) of the cutting part corresponding to the same arc-shaped groove (220) are smoothly transitionally connected via an arc-shaped part (125).

3. The indexable insert according to claim 2, characterized in that: The cutting parts (120) are evenly distributed on a circumference centered on the mounting hole (110).

4. The indexable insert according to claim 2, characterized in that: The front side (122) of the cutting part is a plane, and the back side (123) of the cutting part is an arc-shaped surface.

5. The indexable insert according to any one of claims 1 to 4, characterized in that: The front face (122) of the cutting portion intersects with the side profile surface (121) to form two main cutting edges (124), and the angle between the two main cutting edges (124) is the tip angle θ of the cutting portion (120) where they are located, and 30°≤θ≤60°.

6. An indexable turning tool, comprising a tool bar (300) and a blade mounted on the tool bar (300), characterized in that: The insert is an indexable insert as claimed in any one of claims 1 to 5; A mounting portion (310) is provided at the front end of the blade rod (300), and the blade is tiltedly arranged on the mounting portion (310) through the blade body (100), so that the tip (126) of the cutting portion (120) in the working position faces forward and exceeds the tip (126) of the other cutting portions (120), so that the other cutting portions (120) do not interfere with the workpiece (400) during the working process.

7. The indexable turning tool according to claim 6, characterized in that: The indexable turning tool is a turning tool for thread processing; The number of the cutting parts (120) is eight, and the angle between the axis of the blade body (100) and the shank (300) is α, α=75°; The bisector (127) of the cutting edge angle of the cutting portion (120) in the working position is kept parallel to the axis of the cutting rod (300).

8. The indexable turning tool according to claim 6 or 7, characterized in that: A positioning portion (130) is provided on the blade body (100), and the positioning portion (130) has a first positioning structure (131) corresponding one-to-one with the cutting portion (120); A second positioning structure (320) is provided on the knife rod (300); The cutting part (120) is in the working position, and its corresponding first positioning structure (131) is connected in cooperation with the second positioning structure (320).

9. The indexable turning tool according to claim 8, characterized in that: The first positioning structures (131) are first positioning holes having the same number as the positioning portions (130); The second positioning structure (320) is a second positioning hole; The second positioning hole is connected with the corresponding first positioning hole through the positioning piece.

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