Special machining tool for female thread
Patent Information
- Application Number
- CN202522060982.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-25
- Publication Date
- 2026-08-21
- Estimated Expiration
- 2035-09-25
AI Technical Summary
[0003]本实用新型的目的是提供一种母螺纹专用加工刀具，至少解决现有刀具存在的在加工过程中刀片冷却效果不佳，无法有效降低刀片温度，铁屑容易堆积，影响刀片寿命和加工质量的问题
[0015]本实用新型的特点及优点是：本实用新型所提供的母螺纹专用加工刀具设置有与总冷却通道相连通且出口面向待加工孔的孔底设置的轴向冷却通道、以及与总冷却通道相连通且出口与切削刀片的工作端位于安装槽的同一侧的侧向冷却通道，通过轴向冷却通道流出的冷却介质直接冲洗孔底，以有效避免铁屑在孔底堆积，通过侧向冷却通道流出的冷却介质冲洗螺纹键加工产生的新铁屑并对切削刀片进行降温，从而提高铁屑排出能力，避免铁屑堆积挤压切削刀片而导致切削刀片磨损，具有提高切削刀片使用寿命、保证加工稳定性和光洁度的优点。
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Figure CN224658312U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of machining tools, and in particular to a special tool for machining female threads. Background Technology
[0002] Currently, in the machining process of impeller thread keys, existing cutting tools generally suffer from the following defects: due to the long hole depth of the workpiece, the rigidity of existing cutting tools is insufficient, which leads to easy deformation of the cutting tools, affecting machining accuracy and stability; the radial dimension of the cutting tools is limited, which weakens the rigidity of the cutting tools and is also not conducive to chip removal, increasing the machining difficulty; the cooling effect of existing cutting tools is not good during the machining process, which cannot effectively reduce the temperature of the cutting tools, and the chips are easy to accumulate, affecting the cutting tool life and machining quality; the cutting tools wear out frequently and are easily damaged, requiring frequent tool replacements. Utility Model Content
[0003] The purpose of this utility model is to provide a special tool for machining female threads, which at least solves the problems of poor blade cooling during machining, inability to effectively reduce blade temperature, easy accumulation of iron filings, and impact on blade life and machining quality.
[0004] The above-mentioned objectives of this utility model can be achieved by the following technical solutions:
[0005] This utility model provides a special tool for machining female threads, including a tool body and a cutting insert. The tool body has a working section that can penetrate deep into the workpiece. A chip removal channel is formed between the working section and the hole to be machined. A mounting groove is provided at the free end of the working section, and the cutting insert is installed in the mounting groove. The free end of the working section is bifurcated into two elastic arms by the mounting groove, and the two elastic arms hold the cutting insert. A main cooling channel is provided inside the tool body, and a lateral cooling channel connected to the main cooling channel is provided on the working section. The outlet of the lateral cooling channel faces the side wall of the hole to be machined, and the outlet of the lateral cooling channel and the working end of the cutting insert are located on the same side of the mounting groove.
[0006] Preferably, the cross-sectional shape of the working section is elliptical or quasi-elliptical, and along the radial direction of the blade body, the portion of the working section located outside the inscribed circle of the cross-section forms a reinforcing part.
[0007] Preferably, the sidewall of the elastic arm located in front of the cutting blade is formed with a guide surface that is obliquely arranged toward the working end of the cutting blade, and the outlet of the lateral cooling channel is located on the guide surface.
[0008] Preferably, the working section is further provided with an axial cooling channel connected to the main cooling channel. Along the machining direction of the thread key, the outlet of the axial cooling channel is located at the free end of the elastic arm behind the cutting blade and away from the working end of the cutting blade.
[0009] Preferably, the free ends of the two elastic arms are provided with chip removal guiding surfaces, which are disposed away from the working end of the cutting blade and along the axial direction of the blade body toward the working section. The chip removal guiding surfaces are inclined from the side wall surface of the elastic arm toward the center of the free end of the working section.
[0010] Preferably, along the machining direction of the threaded key, a support structure is formed at the free end of the elastic arm located behind the cutting blade. The support structure protrudes from the side of the working section. At least part of the working end of the cutting blade is seated on the support structure. The support structure extends a predetermined distance along an inclined helix angle. The special machining tool for the helix angle female thread is consistent with the helix angle of the threaded key to be machined.
[0011] Preferably, the end face of the working section has an inclination angle with the plane perpendicular to the axis of the cutter body, the inclination angle being consistent with the thread helix angle of the thread key to be processed, and one side of the support structure is on the same plane as the end face of the working section.
[0012] Preferably, the two elastic arms have convex V-shaped positioning surfaces formed on their opposite end walls, and the cutting blades have concave V-shaped positioning surfaces that are adapted to the convex V-shaped positioning surfaces on their opposite sides.
[0013] Preferably, the bottom of the mounting groove is provided with an elastic groove to increase the elasticity of the two elastic arms. The two elastic arms are connected by fasteners to securely clamp the cutting blade. Along the thread key machining direction, the side wall of the elastic arm located in front of the cutting blade forms the mounting plane of the fastener. Along the axial direction of the blade body toward the working section, the mounting plane is inclined from the side wall of the elastic arm toward the other elastic arm. The working section has an end face, and the end face has an inclination angle with the plane perpendicular to the axis of the working section. The inclination angle is consistent with the thread helix angle of the thread key to be machined. The opening direction of the elastic groove is perpendicular to the end face, and the mounting plane is perpendicular to the end face.
[0014] Preferably, along the machining direction of the threaded key, a chip removal groove is formed on the side wall of the elastic arm located in front of the cutting blade. The chip removal groove is located downstream of the mounting plane and on the same side as the working end of the cutting blade along the axial direction of the tool body away from the working section.
[0015] The features and advantages of this utility model are as follows: The special machining tool for female threads provided by this utility model is equipped with an axial cooling channel connected to the main cooling channel and with its outlet facing the bottom of the hole to be machined, and a lateral cooling channel connected to the main cooling channel and with its outlet and the working end of the cutting tool located on the same side of the mounting groove. The cooling medium flowing out through the axial cooling channel directly washes the bottom of the hole to effectively prevent iron filings from accumulating at the bottom of the hole. The cooling medium flowing out through the lateral cooling channel washes away the new iron filings generated during the machining of the thread key and cools the cutting tool, thereby improving the iron filings discharge capacity and preventing iron filings from accumulating and squeezing the cutting tool, which would cause the cutting tool to wear. It has the advantages of improving the service life of the cutting tool, ensuring machining stability and surface finish. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments 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.
[0017] Figure 1 This is a schematic diagram of the tool body in the special tool for machining female threads provided in the embodiments of this utility model;
[0018] Figure 2 A partial structural diagram of the working section on the tool body of the female thread special machining tool provided in this embodiment of the utility model;
[0019] Figure 3 A schematic diagram of the structure of the special machining tool for female threads without chip removal groove provided in this embodiment of the utility model;
[0020] Figure 4 This utility model provides a schematic diagram of chip removal during operation of a special tool for machining female threads without chip removal grooves.
[0021] Figure 5 This utility model provides a schematic diagram of the structure of a special machining tool for female threads with chip removal grooves.
[0022] Explanation of icon numbers:
[0023] 1. Blade body;
[0024] 11. Ontology segment;
[0025] 12. Working section; 121. First elastic arm; 1211. Support structure; 1212. First convex V-shaped positioning surface; 122. Second elastic arm; 1221. Guide surface; 1222. Second convex V-shaped positioning surface; 1223. Mounting plane; 1224. Arc transition groove; 1225. Chip removal groove; 123. Chip removal guide surface;
[0026] 2. Cutting blades;
[0027] 3. Fasteners;
[0028] 10. Chip removal channel;
[0029] 20. Mounting slot;
[0030] 30. Axial cooling channel;
[0031] 40. Side cooling channel;
[0032] 50. Holes to be machined;
[0033] 60. Elastic groove;
[0034] α, The angle between the mounting plane and the center line of the tool body;
[0035] β, the thread helix angle of the supporting structure;
[0036] F1, direction of thread key machining;
[0037] F2, long axis direction. Detailed Implementation
[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0039] like Figures 1 to 5As shown, this utility model provides a special tool for machining female threads, including a tool body 1. The tool body 1 has a body section 11 and a working section 12 that can penetrate into the workpiece. A chip removal channel 10 is formed between the working section 12 and the hole to be machined 50. The free end of the working section 12 is provided with a mounting groove 20 perpendicular to its end face. A cutting blade 2 is installed in the mounting groove 20. The free end of the working section 12 is bifurcated into two elastic arms by the mounting groove 20. The two elastic arms are connected by fasteners 3 to securely clamp the cutting blade 2. The tool body 1 has a main cooling channel inside. The working section 12 has an axial cooling channel 30 and a lateral cooling channel 40 connected to the main cooling channel. The outlet of the axial cooling channel 30 faces the bottom of the hole 50 to be machined, and the outlet of the lateral cooling channel 40 faces the side wall of the hole 50 to be machined. That is, the outlet of the axial cooling channel 30 is axial, and the outlet of the lateral cooling channel 40 is circumferential. The outlet of the lateral cooling channel 40 and the working end of the cutting insert 2 are located on the same side of the mounting groove 20, so that the cooling medium flowing out from the lateral cooling channel 40 can cover the cutting insert 2 and achieve cooling of the cutting insert 2. The working end of the cutting insert 2 is the end where the cutting edge is located after the cutting insert 2 is installed on the tool body 1 to form a cutting tool and is used to contact the hole wall of the hole 50 to achieve cutting.
[0040] The special tool for machining female threads provided by this utility model is equipped with an axial cooling channel 30 connected to the main cooling channel and with its outlet facing the bottom of the hole 50 to be machined, and a lateral cooling channel 40 connected to the main cooling channel and with its outlet on the same side as the working end of the cutting blade 2 located in the mounting groove 20. The cooling medium flowing out through the axial cooling channel 30 directly washes the bottom of the hole to effectively prevent iron filings from accumulating at the bottom of the hole. The cooling medium flowing out through the lateral cooling channel 40 washes away the new iron filings generated during the machining of the thread key and cools the cutting blade 2, thereby improving the iron filings discharge capacity and preventing iron filings from accumulating and squeezing the cutting blade 2, which would cause the cutting blade 2 to wear. It has the advantages of improving the service life of the cutting blade 2, ensuring machining stability and surface finish.
[0041] For example, such as Figures 1 to 3 As shown, the mounting groove 20 forks the free end of the working section 12 into two elastic arms. Along the threaded key machining direction F1, the elastic arm located behind the cutting blade 2 is the first elastic arm 121, and the elastic arm located in front of the cutting blade 2 is the second elastic arm 122. The cutting blade 2 is positioned at the opening of the mounting groove 20 and is held by the two elastic arms, which are connected by fasteners 3 to ensure stable clamping. In a preferred embodiment, the fasteners 3 are fastening screws, and the first elastic arm 121 has threaded holes that mate with the fastening screws, thus facilitating adjustment of the clamping force of the two elastic arms on the cutting blade 2.
[0042] As a preferred implementation method, such as Figures 1 to 3As shown, the bottom of the mounting groove 20 is provided with an elastic groove 60 to increase the elasticity of the two elastic arms, so as to facilitate the quick installation of the cutting blade 2. The opening direction of the elastic groove 60 is perpendicular to the end face of the working section 12 to take into account the structural strength of the two elastic arms.
[0043] The main cooling channel is arranged along the centerline of the tool body 1. The axial cooling channel 30 is located on the first elastic arm 121, and the lateral cooling channel 40 is located on the second elastic arm 122 to ensure the rigidity and structural strength of the tool for machining female threads. Preferably, the cutting insert 2 has a double-ended cutting edge, which doubles the service life compared to a single-ended cutting edge insert, reducing the frequency of insert replacement and improving production efficiency and flexibility. Furthermore, the cutting insert 2 is coated with a wear-resistant coating to further increase its service life and make it more suitable for machining stainless steel.
[0044] According to one embodiment of this utility model, when the hole 50 to be processed is a circular hole, the cross-sectional shape of the working section 12 is non-circular. Along the radial direction of the tool body 1, the portion of the working section 12 located outside the inscribed circle of the cross-section forms a reinforcing part. That is, in this application, the working section 12 includes a cylindrical portion located inside the inscribed circle of the cross-section and a reinforcing part located outside the inscribed circle of the cross-section. Compared with the prior art which only has a cylindrical portion, this application forms a reinforcing part by partially expanding the cylindrical portion in the radial direction. This configuration improves the rigidity and structural strength of the working section 12 while ensuring the chip removal capacity of the chip removal channel 10, reduces the deformation of the working section 12, and thus ensures high-precision machining. It is suitable for deep hole machining and solves the problem that the diameter of the portion of the cylindrical tool that extends into the workpiece is small, the rigidity is poor, and it is prone to vibration.
[0045] According to a preferred embodiment of this utility model, the cross-sectional shape of the working section 12 is elliptical or quasi-elliptical to fully utilize the maximum space within the hole, maximize the size of the working section 12, enhance rigidity and improve stability, and also accommodate the space of the chip removal channel 10 to prevent damage to the tool caused by chip compression. As a preferred embodiment, such as... Figures 1 to 5 As shown, in order to ensure that the working section 12 can balance good chip removal capability and structural strength, the working end of the cutting blade 2 is located on the long axis direction F2 of the working section 12, that is, the free end of the working section 12 is forked into the first elastic arm 121 and the second elastic arm 122 located on both sides of the long axis.
[0046] According to one embodiment of the present invention, such as Figures 1 to 3As shown, along the thread key machining direction F1, the sidewall of the elastic arm located in front of the cutting insert 2 has a guide surface 1221 formed at an angle towards the working end of the cutting insert 2. The outlet of the lateral cooling channel 40 is located on the guide surface 1221. By setting the guide surface 1221 on the second elastic arm 122, the new iron chips generated during thread key machining are guided to be quickly discharged from the machining area. By setting the outlet of the lateral cooling channel 40 on the guide surface 1221, the cooling medium is guided to flow to the working end of the cutting insert 2, ensuring the cooling effect of the cutting insert 2 and the flushing effect of the machined hole 50.
[0047] According to one embodiment of the present invention, such as Figure 1 As shown, along the thread key machining direction F1, the outlet of the axial cooling channel 30 is located at the free end of the elastic arm behind the cutting insert 2, and the outlet of the axial cooling channel 30 is positioned away from the working end of the cutting insert 2. In this way, the axial cooling channel 30 and the lateral cooling channel 40 are positioned as far apart as possible to ensure that the free end of the working section 12 has good structural strength and to maintain the long-term stable clamping of the cutting insert 2 by the first elastic arm 121 and the second elastic arm 122.
[0048] According to one embodiment of the present invention, such as Figure 1 , Figure 2 and Figure 4 As shown, chip removal guide surfaces 123 are formed at the free ends of the two elastic arms. The chip removal guide surfaces 123 are set away from the working end of the cutting blade 2 and are inclined from the side wall of the elastic arm toward the center of the free end of the working section 12 along the axis of the cutter body 1 toward the working section 12, that is, along the direction from the body section 11 to the working section 12. The chip removal guide surfaces 123 and the working section of the cutting blade are located on opposite sides of the axis of the working section 12. By setting the chip removal guide surfaces 123 in conjunction with the flushing of the cooling medium in the axial cooling channel 30, the iron chips falling to the bottom of the hole are discharged, avoiding the impact and squeezing of the iron chips on the cutting blade 2, and improving the machining stability and surface finish.
[0049] According to one embodiment of the present invention, such as Figure 2As shown, along the thread key machining direction F1, a support structure 1211 is formed at the free end of the elastic arm located behind the cutting insert 2. The support structure 1211 protrudes from the side of the working section 12. The working end of the cutting insert 2 is at least partially seated on the support structure 1211. That is, the support structure 1211 is arranged on the same side as the working end of the cutting insert 2 and protrudes from the cross-section of the working section 12 to provide support for the cutting insert 2, preventing the cutting insert 2 from being obstructed and deformed backward when machining the thread key in the hole 50 to be machined, thereby affecting the quality of the thread key machining. The support structure 1211 extends a predetermined distance along an inclined helix angle, which is consistent with the helix angle of the thread key to be machined. Thus, during the thread key machining of the hole 50 to be machined, the support structure 1211 supported on the rear side of the cutting insert 2 can be embedded into the machined thread groove, further improving the support effect of the support structure 1211 on the cutting insert 2 and avoiding the generation of new machining resistance, thus ensuring cutting efficiency. Among them, the helix angle β of the support structure 1211 is as follows: Figure 2 As shown.
[0050] According to one embodiment of the present invention, such as Figure 2 As shown, the end face of the working section 12 has an inclination angle with the plane perpendicular to the axis of the tool body 1. The inclination angle is consistent with the thread helix angle of the thread key to be machined, and one side of the support structure 1211 is on the same plane as the end face of the working section 12. In this way, the machining of the support structure 1211 can be facilitated, and the machining resistance can be further reduced, thereby improving the cutting efficiency.
[0051] According to one embodiment of the present invention, such as Figure 2 As shown, convex V-shaped positioning surfaces are formed on the two end walls of the mounting groove 20, and concave V-shaped positioning surfaces that match the convex V-shaped positioning surfaces are formed on opposite sides of the cutting blade 2. By setting multiple convex V-shaped positioning surfaces, compared with the existing single V-shaped positioning surface, the cutting blade 2 can be better wrapped, improving the positioning accuracy and stability of the cutting blade 2, reducing vibration, and thus improving the machining quality. In this embodiment, the convex V-shaped positioning surface located on the first elastic arm 121 is the first convex V-shaped positioning surface 1212, the convex V-shaped positioning surface located on the second elastic arm 122 is the second convex V-shaped positioning surface 1222, the concave V-shaped positioning surface on the cutting blade 2 that cooperates with the first convex V-shaped positioning surface 1212 is the first concave V-shaped positioning surface, and the concave V-shaped positioning surface on the cutting blade 2 that cooperates with the second convex V-shaped positioning surface 1222 is the second concave V-shaped positioning surface. As a preferred embodiment, along the long axis direction F2 of the working section 12, the protrusion of the first convex V-shaped positioning surface 1212 is staggered from the protrusion of the second convex V-shaped positioning surface 1222 to ensure the overall rigidity and structural strength of the cutting blade 2.
[0052] According to one embodiment of the present invention, such as Figure 1, Figure 2 and Figure 4 As shown, along the thread key machining direction F1, a mounting plane 1223 for the fastener 3 is formed on the side wall of the elastic arm located in front of the cutting insert 2. The mounting plane 1223 is provided on the second elastic arm 122 to facilitate screw tightening. Along the axis of the tool body 1 away from the working section 12, i.e., from the body section 11 to the working section 12, the mounting plane 1223 is inclined from the side wall of the elastic arm toward the other elastic arm. The mounting plane 1223 is perpendicular to the end face, meaning the angle α between the mounting plane 1223 and the centerline of the tool body 1 is equal to the helix angle β of the support structure 1211. This guides the removal of chips falling to the bottom of the hole and new chips generated during thread key machining, improving chip removal capability. The chip removal direction at the bottom of the hole is as follows: Figure 4 As shown by the dashed arrow, the direction of new iron filings removal is as follows: Figure 4 As indicated by the solid arrow. In this embodiment, the angle α between the mounting plane and the center line of the blade body is preferably 13°~18° to ensure the rigidity and structural strength of the second elastic arm 122. As a preferred embodiment, an arc transition groove 1224 is provided downstream of the mounting plane 1223 in the direction from the working section 12 to the body section 11 to ensure uniform force distribution when the fastening screw is tightened and to prevent stress concentration.
[0053] According to one embodiment of the present invention, such as Figure 5 As shown, along the thread key machining direction F1, a chip removal groove 1225 is formed on the side wall of the elastic arm located in front of the cutting insert 2. From the working section 12 to the body section 11, the chip removal groove 1225 is located downstream of the mounting plane 1223 and is positioned on the same side as the working end of the cutting insert 2. Specifically, as... Figure 5 As shown, from the working section 12 to the body section 11, the mounting plane 1223, the arc transition groove 1224, and the chip removal groove 1225 are arranged in sequence. The chip removal groove 1225 extends to the middle of the working section 12 to obtain better chip removal guidance function and further improve chip removal capacity.
[0054] Based on the above description, the special machining tool for female threads provided in this embodiment of the utility model has the following beneficial effects:
[0055] The thread-machining tool provided in this embodiment of the invention is equipped with an axial cooling channel 30 connected to the main cooling channel and with its outlet facing the bottom of the hole 50 to be machined, and a lateral cooling channel 40 connected to the main cooling channel and with its outlet on the same side as the working end of the cutting blade 2 located in the mounting groove 20. The cooling medium flowing out through the axial cooling channel 30 directly flushes the bottom of the hole to effectively prevent iron filings from accumulating at the bottom of the hole. The cooling medium flowing out through the lateral cooling channel 40 flushes away new iron filings generated during thread machining and cools the cutting blade 2, thereby improving the iron filings discharge capacity and preventing iron filings from accumulating and squeezing the cutting blade 2, which would cause wear on the cutting blade 2. This improves the service life of the cutting blade 2 and ensures stable machining. Advantages in terms of stability and surface finish; the cross-sectional shape of the working section 12 is designed as an ellipse or near-ellipse to make full use of the maximum space inside the hole, maximize the size of the working section 12, enhance rigidity and improve stability, and also take into account the space of the chip removal channel 10 to avoid damage to the tool caused by the extrusion of iron chips; by setting a multi-convex V-shaped positioning surface, the cutting insert 2 is better wrapped, improving the positioning accuracy and stability of the cutting insert 2, reducing vibration, and thus improving the machining quality; and from the working section 12 to the body section 11, a mounting plane 1223, an arc transition groove 1224, and a chip removal groove 1225 are sequentially provided to avoid stress concentration when the fastening screw is tightened and to obtain better chip removal guidance function, further improving chip removal capacity.
[0056] The above descriptions are merely a few embodiments of this utility model. Those skilled in the art can make various modifications or variations to the embodiments of this utility model based on the content disclosed in the application documents without departing from the spirit and scope of this utility model.
Claims
1. A special tool for machining female threads, comprising a tool body and a cutting insert, characterized in that, The tool body has a working section that can penetrate deep into the workpiece. A chip removal channel is formed between the working section and the hole to be machined. The free end of the working section is provided with a mounting groove. The cutting blade is installed in the mounting groove. The free end of the working section is bifurcated into two elastic arms by the mounting groove. The two elastic arms hold the cutting blade. The tool body has a main cooling channel inside, and the working section has a lateral cooling channel connected to the main cooling channel. The outlet of the lateral cooling channel faces the side wall of the hole to be machined, and the outlet of the lateral cooling channel and the working end of the cutting tool are located on the same side of the mounting groove.
2. The special machining tool for female threads according to claim 1, characterized in that, The cross-sectional shape of the working section is elliptical or quasi-elliptical, and along the radial direction of the blade body, the portion of the working section located outside the inscribed circle of the cross-section forms a reinforcing part.
3. The special machining tool for female threads according to claim 1, characterized in that, Along the machining direction of the threaded key, the side wall of the elastic arm located in front of the cutting blade is formed with a guide surface that is obliquely arranged toward the working end of the cutting blade, and the outlet of the lateral cooling channel is located on the guide surface.
4. The special machining tool for female threads according to claim 1 or 3, characterized in that, The working section is also provided with an axial cooling channel connected to the main cooling channel. Along the thread key machining direction, the outlet of the axial cooling channel is located at the free end of the elastic arm behind the cutting blade and away from the working end of the cutting blade.
5. The special machining tool for female threads according to claim 4, characterized in that, The free ends of the two elastic arms are provided with chip removal guide surfaces. The chip removal guide surfaces are disposed away from the working end of the cutting blade and are disposed along the axial direction of the blade body toward the working section. The chip removal guide surfaces are inclined from the side wall surface of the elastic arm toward the center of the free end of the working section.
6. The special machining tool for female threads according to claim 1, characterized in that, Along the machining direction of the threaded key, a support structure is formed at the free end of the elastic arm located behind the cutting insert. The support structure protrudes from the side of the working section. At least part of the working end of the cutting insert is seated on the support structure. The support structure extends a predetermined distance along an inclined helix angle, which is consistent with the thread helix angle of the threaded key to be machined.
7. The special machining tool for female threads according to claim 6, characterized in that, The end face of the working section has an inclination angle with the plane perpendicular to the axis of the cutter body. The inclination angle is consistent with the thread helix angle of the thread key to be processed, and one side of the support structure is on the same plane as the end face of the working section.
8. The special machining tool for female threads according to claim 1, characterized in that, The two elastic arms have convex V-shaped positioning surfaces formed on their opposite end walls, and the cutting blades have concave V-shaped positioning surfaces that are adapted to the convex V-shaped positioning surfaces on their opposite sides.
9. The special machining tool for female threads according to claim 1, characterized in that, The bottom of the mounting groove is provided with an elastic groove to increase the elasticity of the two elastic arms. The two elastic arms are connected by fasteners to securely clamp the cutting blade. Along the thread key machining direction, the side wall of the elastic arm located in front of the cutting blade forms the mounting plane of the fastener. Along the axial direction of the tool body toward the working section, the mounting plane is inclined from the side wall of the elastic arm toward the other elastic arm. The working section has an end face, and the end face has an inclination angle with the plane perpendicular to the axis of the tool body. The inclination angle is consistent with the thread helix angle of the thread key to be machined. The opening direction of the elastic groove is perpendicular to the end face, and the mounting plane is perpendicular to the end face.
10. The special machining tool for female threads according to claim 9, characterized in that, Along the direction of thread key machining, a chip removal groove is formed on the side wall of the elastic arm located in front of the cutting insert. Along the axis of the tool body away from the working section, the chip removal groove is located downstream of the mounting plane and is set on the same side as the working end of the cutting insert.