Turning tool with adjustable lead angle

Abstract

The utility model provides a turning tool with an adjustable helix angle, which belongs to the technical field of metal cutting processing, and adopts the technical scheme that the turning tool with the adjustable helix angle comprises a tool body assembly and a tool apron assembly, the tool body assembly comprises a connecting disc and a connecting circular truncated cone, a limiting block is fixed on the outer wall of the connecting disc, and the connecting circular truncated cone is fixed on one side surface of the connecting disc. The tool apron assembly comprises a mounting sleeve, the inner wall of the mounting sleeve is a conical surface, the conical surface and the connecting circular truncated cone are the same in taper, a limiting groove is formed in the end face, close to the limiting block, of the mounting sleeve, and the limiting groove is matched with the limiting block in size. The cutter body assembly locking device has the advantages that the cutter body assembly is locked through friction force, the locking acting force of the cutter body assembly locking device is even and stable and cannot be changed due to rotation of the cutter body assembly, and compared with other modes, the cutter body assembly can be fixed more reliably. Therefore, under the action of cutting force, the blade is not prone to loosening and displacement, and then the machining quality is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model belongs to metal cutting processing technical field, concretely relates to a helical lead angle adjustable turning tool. BACKGROUND

[0002] In the field of metal cutting processing, when machining large pitch thread, because its helical lead angle is larger, the conventional turning tool is prone to interference with the workpiece, leading to the failure of smooth machining, seriously affecting the machining precision and efficiency. If the turning tool can flexibly adjust the helical lead angle, the side cutting edge close to the workpiece is increased by the adaptive angle during machining, which can effectively avoid the interference problem, ensure the smooth turning process, and significantly improve the machining quality and efficiency of large pitch thread.

[0003] The existing helical lead angle adjustable turning tool is fixed by compression screws. For example, the patent with the announcement number CN220372222U is provided with a circular through hole in front and back of the mounting seat, a conversion sleeve composed of two half cylinders is assembled in the circular through hole, the inner hole of the conversion sleeve is a square hole, and the square hole is specially used for clamping the tool bar of the blade. Threaded holes are opened on the top surface of the mounting seat, the compression screws are screwed into the threaded holes, the end of the compression screw is used to apply pressure to the conversion sleeve, and the clamping of the blade by the conversion sleeve is realized. During actual machining process, the operator only needs to rotate the conversion sleeve and then lock it by means of the compression screw, so as to realize the adjustment of the helical lead angle of the turning tool.

[0004] However, since the conversion sleeve is composed of two half cylinders, only when the normal pressure of the compression screw is perpendicular to the joint surface, the compression effect can be fully exerted, and the conversion sleeve can be stably clamped. However, during the machining process, as the conversion sleeve rotates to adjust the helical lead angle, the direction of the joint surface changes constantly, and it is difficult to always ensure that the normal pressure of the compression screw is perpendicular to the joint surface. Once the two are not perpendicular, the effective compression force of the compression screw will be greatly weakened, so that the conversion sleeve cannot firmly clamp the blade. The blade is prone to loose displacement under the action of cutting force, which not only leads to the loss of the adjustment accuracy of the helical lead angle of the turning tool, but also greatly reduces the precision of the machined thread, and may also cause abnormal wear of the blade, shorten the service life of the blade, and increase the production cost. UTILITY MODEL CONTENTS

[0005] The utility model provides a helical lead angle adjustable turning tool which can stably fix the blade and ensure the machining quality, and the blade is not prone to loose displacement under the action of cutting force.

[0006] To solve the above problems, the utility model adopts the technical scheme, a kind of screw lead angle adjustable tool bit, including tool body component and tool holder component, tool body component is installed inside the tool holder component, and tool body component can rotate and lock in the inside of tool holder component, tool body component is fixed with blade on it, tool body component includes connecting disc, and the outer wall of connecting disc is fixed with limit block, the side surface of connecting disc is fixed with clamping piece, the other side surface of connecting disc is fixed with connecting circular platform, and the large diameter end surface of connecting circular platform is fixedly connected with connecting disc, and limit screw hole is arranged on the small diameter end surface of connecting circular platform;Tool holder component includes mounting sleeve, the inner wall of the end of mounting sleeve away from connecting disc is conical surface, and the taper of conical surface is same with connecting circular platform, the end surface of mounting sleeve close to limit block is provided with limit slot, the size of limit slot is compatible with limit block, the end surface of mounting sleeve away from limit block is fixed with baffle, and the baffle is provided with light hole one, the position and size of light hole one are compatible with limit screw hole, and the outside of mounting sleeve is provided with limit bolt that is screwed through light hole one and is connected with limit screw hole.

[0007] In the technical scheme, the blade is first installed and fixed to the clamping piece. Then the connecting disc is rotated, and when the blade reaches a predetermined inclination angle, the limit bolt is rotated to make the connecting circular platform enter the inside of the mounting sleeve until the conical surface of the inner wall of the mounting sleeve and the outer wall of the connecting circular platform are locked by friction. By the friction force, the tool body component is stably fixed in the tool holder component. At the same time, the limit block is clamped into the limit slot to prevent the tool body component from rotating in the tool holder component. Therefore, the present scheme uses friction force to lock the tool body component, and the locking force is uniform and stable and does not change when the tool body component rotates, so that the tool body component can be more reliably fixed. In this way, the blade is not easy to loosen and displace under the action of cutting force, thereby ensuring the machining quality.

[0008] Further, the limit block is arranged in a regular triangle shape, the limit slot is arranged in an inverted triangle shape compatible with the limit block, and the limit slot is evenly distributed at equal angles with the axis of the mounting sleeve as the center. The regular triangle-shaped limit block and the inverted triangle-shaped limit slot cooperate to form a stable fitting structure. When subjected to external force, it is not easy to deform or misalign, thereby ensuring the limiting of the tool body component, avoiding rotation of the tool body component, and ensuring the stability of the tool body component during operation.

[0009] Further, the inner wall of the end of the mounting sleeve close to the connecting disc is a cylindrical surface, and the cylindrical surface is seamlessly and smoothly connected between the conical surface. The seamless and smooth connection between the cylindrical surface and the conical surface avoids stress concentration points caused by unsmooth connection, makes the overall structure of the mounting sleeve more stable, can more evenly disperse stress when subjected to external force, reduces the possibility of cracks or damage, and prolongs the service life.

[0010] Further, the height of the conical surface is greater than the height of the connecting circular truncated cone. When the height of the conical surface is greater than the height of the connecting circular truncated cone, the connecting circular truncated cone can have more contact area with the conical surface when they are matched, thereby generating greater friction, making the locking force between the connecting circular truncated cone and the conical surface stronger, effectively preventing the connecting circular truncated cone from slipping relative to the mounting sleeve.

[0011] Further, the center line of the limiting screw hole coincides with the axis of the connecting circular truncated cone. When the limiting bolt exerts force on the connecting circular truncated cone, the connecting circular truncated cone is uniformly stressed, meaning that each part of the connecting circular truncated cone bears a relatively balanced force and is not prone to local stress concentration. When subjected to external force, the entire connecting circular truncated cone can resist the external force in a coordinated manner and is not prone to deformation, damage, or loosening due to local stress concentration, thereby enhancing the stability of the overall structure and ensuring that the connecting circular truncated cone can maintain a good working state during cutting and other operations.

[0012] Further, the mounting sleeve has a spring arranged inside and sleeved around the limiting bolt, one end of the spring abutting against the small-diameter end surface of the connecting circular truncated cone, and the other end of the spring abutting against the baffle. When it is necessary to adjust the inclination angle of the blade or disassemble and assemble the tool body assembly, after the limiting bolt is loosened, the spring can push the connecting circular truncated cone using its own elastic force, causing the connecting circular truncated cone to automatically separate from the conical surface of the mounting sleeve by a certain distance, thereby facilitating subsequent operations by the operator and improving the convenience and efficiency of the operations.

[0013] Further, the clamping member includes a support body and a pressing plate, the blade is located between the support body and the pressing plate, the support body is provided with a locking screw hole, the pressing plate is provided with a light hole two, the position and size of the light hole two are adapted to the locking screw hole, and the top of the pressing plate is provided with a locking bolt passing through the light hole two and threadedly connected with the locking screw hole. The blade is tightly clamped between the pressing plate and the support body, and the locking bolt and the locking screw hole are threadedly connected, thereby providing reliable clamping force, preventing the blade from loosening, shifting, or vibrating during cutting, ensuring that the blade can stably perform cutting work, and ensuring machining precision and quality.

[0014] Further, the support body includes a connecting portion close to the connecting disc and a support portion away from the connecting disc, the connecting portion is fixedly connected with the side surface of the connecting disc, the top of the support portion is fixedly provided with a boss capable of being matched with the groove at the bottom of the blade, and the blade is clamped on the boss. The design that the boss is matched with the groove at the bottom of the blade can provide accurate positioning reference for the blade. Through this clamping mode, the blade can be accurately placed at the predetermined position during installation, ensuring that the main cutting edge of the blade has correct relative position and angle with the machining object, which helps to improve machining precision and ensure the stability and consistency of machining quality.

[0015] Furthermore, the top surface of the connecting part, the bottom surface of the pressure plate, and the top surface of the insert are all inclined planes and parallel to each other, and the inclination angle of the inclined planes is consistent with the helix angle of the thread to be machined. Since the inclination angle of the inclined planes is consistent with the helix angle, the cutting force can be evenly distributed on the main cutting edge of the insert, avoiding the concentration of cutting force at a certain point or in a certain area, thereby reducing local wear and fatigue of the insert and extending the service life of the insert.

[0016] Furthermore, a connecting block is fixed to the outer wall of the mounting sleeve, which can be installed and locked into the tool holder's tool slot. This structure makes the installation process of the mounting sleeve simple and quick; installation can be completed simply by aligning the connecting block with the tool slot and locking it. Compared with some complex installation methods, this greatly saves installation time and improves production efficiency.

[0017] As can be seen from the above technical solution, the advantages of this utility model are as follows: In this technical solution, the tool body assembly and the tool holder assembly are locked together by friction. No matter how the tool body assembly rotates, it remains firmly fixed within the tool holder assembly. Simultaneously, the limiting block engages with the limiting groove, effectively preventing the tool body assembly from rotating within the tool holder assembly, further ensuring the stability of the connection. After the tool body assembly rotates, the main cutting edge of the blade approaches a horizontal state, ensuring uniform force on the main cutting edge during cutting. Locking the tool body assembly by friction provides a uniform and stable locking force that does not change due to the rotation of the tool body assembly, thus providing a more reliable fixation compared to other methods. Therefore, under the action of cutting force, the blade is less prone to loosening or displacement, thereby ensuring machining quality. Attached Figure Description

[0018] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a structural schematic diagram of a specific embodiment of the present utility model;

[0020] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0021] Figure 3 This is a front view of a specific embodiment of the present utility model;

[0022] Figure 4 This is a left view of a specific embodiment of the present utility model;

[0023] Figure 5 for Figure 4A cross-sectional view of the middle B-B;

[0024] Figure 6 The structure schematic view of the tool body assembly in the specific embodiment of the utility model.

[0025] In the figure: 1. tool body assembly, 11. connecting disc, 111. limiting block, 12. clamping piece, 121. pressing plate, 1211. light hole two, 122. support body, 1221. connecting part, 1222. supporting part, 1223. boss, 1224. locking screw hole, 123. locking bolt, 13. connecting circular table, 131. limiting screw hole, 2. tool seat assembly, 21. mounting sleeve, 211. limiting groove, 212. cylindrical surface, 213. conical surface, 22. connecting block, 3. blade, 31. main cutting edge, 4. limiting bolt, 5. spring, 6. baffle, 61. light hole one. Specific embodiment

[0026] In order to make the purpose, features and advantages of the utility model more obvious and easy to understand, the technical scheme in the utility model will be described clearly and completely in combination with the drawings in the specific embodiment. Obviously, the following described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the patent, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the patent.

[0027] A helical lead angle adjustable turning tool, as shown in Figure 1 、 2 , comprises a tool body assembly 1 and a tool seat assembly 2. The tool body assembly 1 comprises a connecting disc 11, a clamping piece 12 and a connecting circular table 13. The clamping piece 12 is used for installing the blade 3 and is fixed on one side of the connecting disc 11 by integral machining. The connecting circular table 13 is also fixed on the other side of the connecting disc 11 by integral machining. The large diameter end face of the connecting circular table 13 is tightly connected with the connecting disc 11, ensuring stable connection. The tool seat assembly 2 is composed of a mounting sleeve 21 and a connecting block 22. The connecting block 22 is fixed on the outer wall of the mounting sleeve 21 by integral machining and can be installed and locked in the tool holder slot of the tool holder by means of bolt fastening or other locking mechanisms, so as to realize stable connection between the tool seat assembly 2 and the tool holder. The connecting circular table 13 is installed in the inside of the mounting sleeve 21 and can rotate in the mounting sleeve 21 and be locked by friction.

[0028] As shown in Figure 3 、 4As shown, in this specific embodiment, the structural design of the blade assembly 1 is as follows: the connecting disk 11 is cylindrical in shape, and the connecting disk 11, clamping member 12, and connecting frustum 13 are all manufactured using an integral machining process, which greatly ensures the strength and stability of the overall structure. A limiting block 111 is fixed to the outer wall of the connecting disk 11 using an integral machining method. The thickness of the limiting block 111 along the axial direction of the connecting disk 11 is less than the axial thickness of the connecting disk 11 itself, and the side of the limiting block 111 completely overlaps with the side of the connecting disk 11 near the clamping member 12. In this embodiment, only one limiting block 111 is provided, and its shape is an equilateral triangle; while in other embodiments, at least twelve limiting blocks 111 are provided, and all limiting blocks 111 are radially and evenly distributed at equal angles around the axis of the connecting disk 11.

[0029] like Figure 6 As shown, the clamping member 12 consists of a support body 122 and a pressure plate 121. The support body 122 includes a connecting portion 1221 near the connecting plate 11 and a supporting portion 1222 away from the connecting plate 11. The connecting portion 1221 is integrally machined and firmly connected to the side of the connecting plate 11; one side of the pressure plate 121 is also integrally machined and fixed to the side of the connecting plate 11. A gap is reserved between the pressure plate 121 and the connecting portion 1221 for clamping the blade 3. A boss 1223 is fixed on the top surface of the supporting portion 1222. The boss 1223 is integrally machined with the supporting portion 1222 and can be precisely embedded into the bottom groove of the blade 3 to achieve a snap-fit ​​engagement between the blade 3 and the boss 1223. In addition, the top surface of the connecting portion 1221, the bottom surface of the pressure plate 121, and the top surface of the blade 3 are all inclined surfaces and parallel to each other. The inclination angle of the inclined surfaces is consistent with the helix angle of the thread to be machined. In this way, when the tool body assembly 1 rotates at the same angle as the helix angle, the main cutting edge 31 of the blade 3 will be in a nearly horizontal state. This nearly horizontal state means that the angle between it and the horizontal plane is between -5° and +5°, thus ensuring that the main cutting edge 31 is subjected to uniform force during cutting. The connecting part 1221 is provided with a locking screw hole 1224, and the pressure plate 121 is provided with a second aperture 1211 whose position and size are adapted to it. The upper part of the pressure plate 121 is equipped with a locking bolt 123 that passes through the second aperture 1211 and is threadedly connected to the locking screw hole 1224. By tightening the locking bolt 123, the pressure plate 121 and the support part 1222 can firmly clamp the blade 3. The connecting frustum 13 is generally frustum shaped, and the large diameter end face of the connecting frustum 13 is the same as the diameter of the connecting plate 11, and the two are smoothly connected. A limiting screw hole 131 is provided on the small-diameter end face of the connecting frustum 13, and the center line of the limiting screw hole 131 coincides with the axis of the connecting frustum 13.

[0030] In this specific embodiment, the structure of the tool holder assembly 2 is as follows: the mounting sleeve 21 is a hollow cylindrical sleeve, and its inner wall is formed by splicing a conical surface 213 and a cylindrical surface 212. The conical surface 213 has the same taper as the connecting frustum 13, the height of the conical surface 213 is greater than the height of the connecting frustum 13, and the height of the cylindrical surface 212 is greater than the axial thickness of the connecting disc 11. The conical surface 213 is located on the inner wall of the mounting sleeve 21 at the end away from the connecting disc 11, and the cylindrical surface 212 is located on the inner wall of the mounting sleeve 21 at the end closer to the connecting disc 11. The side with the larger diameter of the conical surface 213 and the cylindrical surface 212 are smoothly connected by mechanical processing to form a continuous and smooth inner wall structure.

[0031] A limiting groove 211 is provided on the end face of the mounting sleeve 21 near the limiting block 111, and the size of the limiting groove 211 is adapted to the limiting block 111. In this embodiment, the limiting groove 211 is set as an inverted triangle adapted to the limiting block 111, and is radially and evenly distributed at equal angles with the axis of the mounting sleeve 21 as the center. In addition, the evenly distributed limiting groove 211 at equal angles gives it an indexing function. Taking this embodiment as an example, the angle formed by two adjacent limiting grooves 211 and the axis of the mounting sleeve 21 is 0.5°. This means that when the connecting plate 11 rotates, the minimum change unit of its rotation angle is 0.5°. This indexing function can realize precise control of the rotation angle of the connecting plate 11, providing more precise adjustment for related operations. If multiple limiting blocks 111 are provided, the distribution of the limiting grooves 211 must meet the requirement that no matter what angle the connecting plate 11 rotates to, all the limiting blocks 111 can be accurately locked in the limiting grooves 211.

[0032] like Figure 5 As shown, a baffle 6 is integrally machined to the end face of the mounting sleeve 21 away from the limiting block 111. A clear hole 61 is provided on the baffle 6, and the center line of the clear hole 61 coincides with that of the limiting screw hole 131, meaning the position and size of the clear hole 61 are compatible with the limiting screw hole 131. A limiting bolt 4, passing through the clear hole 61 and threadedly connected to the limiting screw hole 131, is provided on the outside of the mounting sleeve 21. A spring 5 is also provided inside the mounting sleeve 21, fitted onto the outside of the limiting bolt 4. One end of the spring 5 is in close contact with the small-diameter end face of the connecting frustum 13, and the other end is in close contact with the baffle 6.

[0033] The specific use process of the utility model is: first, install the blade 3 to the support part 1222 of the support body 122, make the blade 3 bottom recess and boss 1223 accurate snap, then slide the blade 3 along the length direction of the boss 1223, until the top surface of the blade 3 and the bottom surface of the pressing plate 121 are completely contacted, at this time, the pressing plate 121 and the support part 1222 clamp the blade 3. Then, use the tool to tighten the locking bolt 123, the fastening force of the locking bolt 123 makes the pressing plate 121 and the support part 1222 firmly clamp the blade 3. Then, according to the angle of the helix angle of the thread to be processed, manually rotate the connecting disc 11, so that the connecting disc 11 rotates the same angle, at this time, because the angle of the connecting part 1221, the pressing plate 121 and the inclined surface of the blade 3 is consistent with the helix angle, the main cutting edge 31 of the blade 3 is in the approximate horizontal state. Then tighten the limiting bolt 4, the connecting circular platform 13 gradually enters the inside of the mounting sleeve 21 under the pushing of the limiting bolt 4, and the spring 5 outside the limiting bolt 4 is compressed. In this process, the limiting block 111 on the outer wall of the connecting disc 11 will gradually be clamped into the limiting groove 211 on the end face of the mounting sleeve 21 close to the limiting block 111, preventing the connecting disc 11 from rotating in the mounting sleeve 21. When the connecting circular platform 13 continues to penetrate, until the outer wall of the connecting circular platform 13 and the inner wall of the conical surface 213 of the mounting sleeve 21 generate enough friction force due to mutual extrusion, so that the connecting circular platform 13 and the mounting sleeve 21 are completely locked and cannot move relative to each other, stop locking the limiting bolt 4. When the angle needs to be adjusted, only the limiting bolt 4 is loosened by using the tool, and the connecting circular platform 13 can gradually exit from the mounting sleeve 21 under the action of the spring 5. When the limiting block 111 moves out of the limiting groove 211, the connecting disc 11 can be manually rotated for angle adjustment. After adjustment, the limiting bolt 4 is tightened again by using the tool, and the above process of the connecting circular platform 13 entering the mounting sleeve 21 and being locked is repeated, the angle adjustment is completed and the tool bit is returned to the working state.

[0034] As can be seen from the above embodiments, the utility model has the beneficial effects that in the technical scheme, the tool body assembly and the tool holder assembly are locked by friction force. No matter how the tool body assembly rotates, it can be firmly fixed in the tool holder assembly. At the same time, the limiting block is clamped into the limiting groove, effectively preventing the tool body assembly from rotating in the tool holder assembly, further ensuring the stability of the connection. After the tool body assembly rotates, the main cutting edge of the blade tends to be horizontal, ensuring that the main cutting edge is uniformly stressed during cutting. The tool body assembly is locked by friction force, the locking force is uniform and stable, and will not change due to the rotation of the tool body assembly. Compared with other ways, the tool body assembly can be more reliably fixed. Therefore, under the action of the cutting force, the blade is not prone to loose displacement, thereby ensuring the processing quality.

[0035] The above description of disclosed embodiments enables one of ordinary skill in the art to make or use the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A helix angle adjustable turning tool, comprising a tool body assembly (1) and a tool holder assembly (2), wherein the tool body assembly (1) is installed inside the tool holder assembly (2), and the tool body assembly (1) is rotatable and lockable inside the tool holder assembly (2), and a cutting blade (3) is fixed on the tool body assembly (1), characterized in that, The cutter body assembly (1) includes a connecting plate (11), a limit block (111) is fixed on the outer wall of the connecting plate (11), a clamping member (12) is fixed on one side of the connecting plate (11), and a connecting frustum (13) is fixed on the other side of the connecting plate (11). The large-diameter end face of the connecting frustum (13) is fixedly connected to the connecting plate (11), and a limit screw hole (131) is provided on the small-diameter end face of the connecting frustum (13). The cutter holder assembly (2) includes a mounting sleeve (21). The inner wall of the end of the mounting sleeve (21) away from the connecting plate (11) is a conical surface (213). The taper of the surface (213) is the same as that of the connecting frustum (13). The end face of the mounting sleeve (21) near the limit block (111) is provided with a limit groove (211). The size of the limit groove (211) is adapted to the limit block (111). A baffle (6) is fixed on the end face of the mounting sleeve (21) away from the limit block (111). A light hole (61) is provided on the baffle (6). The position and size of the light hole (61) are adapted to the limit screw hole (131). A limit bolt (4) is provided on the outside of the mounting sleeve (21) that passes through the light hole (61) and is threaded to the limit screw hole (131).

2. The adjustable helix angle turning tool according to claim 1, characterized in that, The limiting block (111) is set as an equilateral triangle, and the limiting groove (211) is set as an inverted triangle that matches the limiting block (111). The limiting groove (211) is radially and evenly distributed at equal angles with the axis of the mounting sleeve (21) as the center.

3. The adjustable helix angle turning tool according to claim 1, characterized in that, The inner wall of the end of the mounting sleeve (21) near the connecting plate (11) is a cylindrical surface (212), and there is a seamless and smooth connection between the cylindrical surface (212) and the conical surface (213).

4. The adjustable helix angle turning tool according to claim 1, characterized in that, The height of the conical surface (213) is greater than the height of the connecting frustum (13).

5. The adjustable helix angle turning tool according to claim 1, characterized in that, The centerline of the limiting screw hole (131) coincides with the axis of the connecting frustum (13).

6. The adjustable helix angle turning tool according to claim 4, characterized in that, The sleeve (21) is equipped with a spring (5), which is sleeved on the outside of the limiting bolt (4). One end of the spring (5) abuts against the small diameter end face of the connecting frustum (13), and the other end of the spring (5) abuts against the baffle (6).

7. The adjustable helix angle turning tool according to claim 1, characterized in that, The clamping component (12) includes a support body (122) and a pressure plate (121). The blade (3) is located between the support body (122) and the pressure plate (121). The support body (122) is provided with a locking screw hole (1224). The pressure plate (121) is provided with a second light hole (1211). The position and size of the second light hole (1211) are adapted to the locking screw hole (1224). A locking bolt (123) is provided above the pressure plate (121) that passes through the second light hole (1211) and is threadedly connected to the locking screw hole (1224).

8. The adjustable helix angle turning tool according to claim 7, characterized in that, The support body (122) includes a connecting part (1221) near the connecting plate (11) and a support part (1222) away from the connecting plate (11). The connecting part (1221) is fixedly connected to the side of the connecting plate (11). The top of the support part (1222) is fixed with a boss (1223) that can cooperate with the bottom groove of the blade (3). The blade (3) is snapped onto the boss (1223).

9. The adjustable helix angle turning tool according to claim 7, characterized in that, The top surface of the connecting part (1221), the bottom surface of the pressure plate (121) and the top surface of the blade (3) are all inclined surfaces and parallel to each other, and the inclination angle of the inclined surface is consistent with the helix angle of the thread to be processed.

10. The adjustable helix angle turning tool according to claim 1, characterized in that, A connecting block (22) is fixed on the outer wall of the mounting sleeve (21). The connecting block (22) can be installed and locked in the tool holder's tool slot.

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