A method for machining a female thread composite process

Abstract

The application discloses a female thread composite process machining method and a machining accurate repeated positioning device, relates to the technical field of planetary roller screw manufacturing, and comprises the following steps: rough machining, finish machining, and measuring the offset of the turned thread and the trial ground thread; based on the offset of the turned thread and the trial ground thread, the phase difference between the turned thread and the trial ground thread is obtained; based on the phase difference between the turned thread and the trial ground thread, the starting angle of the grinding machining spindle is obtained; the rough blank part is rotated to the starting angle of the grinding machining spindle; and the finished nut is obtained through finish grinding. The positioning device comprises a base, a code disc and a locking piece, the base is used for being fixed on the chuck of a thread grinding machine during grinding machining, and the end, away from the chuck, of the base is provided with a circumferential scale; the code disc is rotationally arranged in the base, the nut to be machined is clamped on the code disc, and the code disc is provided with an indicating line for indicating the rotation angle. The application can realize high-precision and high-efficiency machining of female threads.

Description

Technical Field

[0001] This application relates to the field of planetary roller screw manufacturing technology, specifically to a method for processing internal threads using a composite process. Background Technology

[0002] Planetary roller screws are transmission components that convert linear and rotary motion. They mainly consist of a screw, nut, rollers, and cage, and distribute load through numerous threaded engagement points. They feature high load capacity, high precision, high rigidity, and long service life. However, the high precision requirements and difficulty in machining the nut, often achieved through thread grinding, result in low efficiency and high cost, hindering the widespread application of planetary roller screws. Machining the nut for reverse-type planetary roller screws, which have a large length-to-diameter ratio, is particularly challenging. Summary of the Invention

[0003] The main purpose of this application is to provide a composite internal thread processing method, which aims to achieve precise alignment of the processing trajectories of multiple thread processing methods, thereby achieving coordinating rough and fine processing of multiple processing methods and realizing high-precision and high-efficiency internal thread processing.

[0004] The technical solution adopted in this application is as follows:

[0005] A method for processing internal threads using a composite process includes the following steps:

[0006] The nut to be processed is clamped on a lathe and the rough thread is machined to obtain a rough blank part.

[0007] After clamping the rough blank on the grinding machine and recording the C-axis angle of the grinding machine at the current clamping position, a thread is tested using the same lead parameters as turning.

[0008] The thread trajectory of the rough blank after trial grinding is scanned, and the offset between the machined thread and the trial-ground thread is measured.

[0009] Based on the offset between the machined thread and the test-ground thread, the phase difference between the machined thread and the test-ground thread is obtained as b / s*360°, where b is the offset between the machined thread and the test-ground thread, and s is the lead.

[0010] Based on the phase difference between the turning thread and the trial grinding thread, the starting angle of the grinding spindle is obtained as α+b / s*360° or α-b / s*360°, where α is the C-axis angle when the blank is clamped in the grinding machine.

[0011] The rough blank is adjusted to the starting angle of the grinding spindle by a precise repeatable positioning device for internal thread compound processing.

[0012] Precision grinding is used to obtain precision nuts.

[0013] Furthermore, when roughing the threads, leave a finishing allowance of 0.1-0.2mm.

[0014] Furthermore, the clamping positions of nuts to be processed in the same batch on the lathe are kept identical.

[0015] Furthermore, the clamping positions of the rough blanks in the same batch on the grinding machine remain the same.

[0016] Furthermore, the precise repeatable positioning device for the internal thread composite process includes:

[0017] A base for fixing to the chuck of a thread grinding machine during grinding, wherein the end of the base away from the chuck is provided with circumferential graduations;

[0018] The code disk is rotatably mounted in the base, and the nut to be processed is clamped and fixed in the code disk. The code disk is provided with an indicator line for indicating the rotation angle.

[0019] A locking element, which is disposed on the base, is used to lock the code disk from rotating.

[0020] Furthermore, the code disk includes:

[0021] The mounting part is connected to the base;

[0022] A clamping part, which is used to clamp the nut to be processed;

[0023] A threaded portion, which connects the mounting portion and the clamping portion.

[0024] Furthermore, the mounting part is mounted in the base via a precision bearing.

[0025] Furthermore, the clamping part is in the shape of a tapered tube, and the clamping part is provided with several positioning grooves around its circumference. The nut to be processed is inserted into the positioning groove by the positioning element.

[0026] Furthermore, the precise repeatable positioning device for internal thread composite processing also includes a locking ring, which is used to tighten the clamping part to clamp the nut to be processed, and the locking ring is threadedly connected to the threaded part.

[0027] Furthermore, the locking element is a locking screw disposed on the outer periphery of the base.

[0028] Compared with the prior art, the beneficial effects of this application are:

[0029] First: This application proposes a composite internal thread processing method, comprising: clamping the nut to be processed on a lathe and turning a rough thread to obtain a rough blank; clamping the rough blank on a grinding machine and recording the C-axis angle of the grinding machine at the current clamping position, and then grinding a thread using the same parameters as the turning; scanning the thread trajectory of the rough blank after the trial grinding and measuring the offset between the turned thread and the trial-ground thread; based on the offset between the turned thread and the trial-ground thread, obtaining the phase difference between the turned thread and the trial-ground thread as b / s*360°, where b is the offset between the turned thread and the trial-ground thread, and s is the lead; based on the phase difference between the turned thread and the trial-ground thread, obtaining the starting angle of the grinding spindle α+b / s*360° or α-b / s*360°, where α is the C-axis angle when the rough blank is clamped on the grinding machine; rotating the rough blank to the starting angle of the grinding spindle; and finishing grinding to obtain a finished nut. This method utilizes thread deviation compensation to achieve accurate and repeatable positioning of the roughing-finishing trajectory. This allows for adjustment of deviation compensation during the machining process to ensure precise alignment of machining trajectories for different processes, thereby enabling coordinating roughing and finishing processes across multiple machining methods and achieving high-precision and high-efficiency machining of internal threads.

[0030] Second: The internal thread composite process processing method proposed in this application uses a precise repeatable positioning device for internal thread composite process processing. By clamping the nut to be processed on the code disk and rotating the code disk, the angle that the nut to be processed needs to deflect after trial grinding can be adjusted, thereby ensuring that the thread trajectory of turning and grinding is precisely aligned. Attached Figure Description

[0031] Figure 1 A flowchart of the internal thread composite process processing method provided in the embodiments of this application;

[0032] Figure 2 A schematic diagram of the structure of a precise repeatable positioning device for internal thread composite process provided in an embodiment of this application;

[0033] Figure 3 An exploded structural diagram of a precise repeatable positioning device for internal thread composite processing provided in an embodiment of this application;

[0034] Figure 4 A cross-sectional view of the precise repeatable positioning device for internal thread composite process processing provided in the embodiment of this application, in its usage state;

[0035] Figure 5 This is a schematic diagram of the roughing thread trajectory of the nut to be machined;

[0036] Figure 6 This is a schematic diagram showing the deviation of the thread trajectory during roughing and finishing.

[0037] Explanation of the labels in the attached drawings:

[0038] 100-Base, 101-Precision bearing, 200-Code disc, 201-Mounting part, 202-Clamping part, 203-Threaded part, 204-Positioning groove, 300-Circumferential scale, 400-Indicator line, 500-Locking ring, 600-Locking screw, 700-Nut to be processed, 800-Positioning pin, 900-Mold. Detailed Implementation

[0039] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0040] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0041] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0042] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0043] See attached document Figure 1This application provides a method for processing internal threads using a composite process, comprising the following steps:

[0044] S1: Clamp the nut to be processed on the lathe and turn the rough thread to obtain the rough blank part;

[0045] S2: Clamp the rough blank on the grinding machine, record the C-axis angle of the grinding machine at the current clamping position, and then test grind a thread using the same lead parameters as turning.

[0046] S3: Perform thread trajectory scanning on the rough blank after trial grinding and measure the offset between the machined thread and the trial-ground thread;

[0047] S4: Based on the offset between the machined thread and the test-ground thread, the phase difference between the machined thread and the test-ground thread is obtained as b / s*360°, where b is the offset between the machined thread and the test-ground thread, and s is the lead.

[0048] S5: Based on the phase difference between the turning thread and the trial grinding thread, obtain the starting angle of the grinding spindle α+b / s*360° or α-b / s*360°, where α is the C-axis angle when the blank is clamped in the grinding machine;

[0049] S6: The rough blank is adjusted to the starting angle of the grinding spindle by a precise repeatable positioning device for internal thread compound processing;

[0050] S7: Precision grinding to obtain a precision nut.

[0051] As is well known, a planetary roller screw is a transmission component that converts linear motion into rotary motion. It is mainly composed of components such as a screw, nut, rollers, and cage. The load is distributed and carried by numerous threaded engagement points, and it has a series of characteristics such as high load capacity, high precision, high rigidity, and long service life.

[0052] The internal threads of planetary roller screw nuts are characterized by high precision and high hardness. Commonly used thread grinding methods are inefficient, greatly affected by equipment and molds, and have poor consistency in machining accuracy, which restricts the mass production of planetary roller screw products. Especially for the machining of internal threads with large length-to-diameter ratio, the large overhang of the grinding rod and the small single feed amount result in low efficiency and low precision.

[0053] In this embodiment, to improve processing efficiency, a composite processing method of roughing followed by finishing is adopted. Through analysis of the processing principle, a method is proposed to use thread deviation compensation to solve the deviation in repeated positioning of different process methods, thereby achieving deviation compensation during the processing process to ensure accurate alignment of the processing trajectory of different processes. This method has the advantage of batch effect of one-time compensation. Parts in the same batch are clamped in the same clamping position and processed without repeated positioning. The operation is simple and achieves high precision and high efficiency processing.

[0054] In the internal thread machining process, the machining steps are divided into roughing and finishing. Roughing is carried out by turning or milling the thread, while finishing is carried out by trial grinding of the thread, such as... Figure 5 As shown, the lead parameter of the internal thread is set to s, where for multi-start threads, the lead s = np; for single-start threads, s = p, where p is the pitch. To further illustrate the detailed steps in the roughing and finishing processes, in the above embodiment:

[0055] For the roughing stage, the nut to be machined is first clamped on the lathe according to the clearly defined turning clamping position requirements, and the thread is turned on the nut according to the design parameters. Before roughing, the clamping datum of the part should be determined using the outer surface of the part when clamping the nut on the lathe. The clamping datum should include axial and circumferential positioning. Usually, features such as locating pin holes or planes on the nut can be selected as clamping datums to ensure that each part is clamped on the lathe according to the same clamping datum and that each part is clamped in the same position (including axial and circumferential positions). After turning, the resulting rough blank is transferred to the next step, such as grinding, for thread finishing. Generally, a finishing allowance of 0.1mm-0.2mm is appropriately reserved in roughing according to the thread tooth size parameters of the part.

[0056] For the finishing stage, the rough blank is clamped onto a thread grinding machine, and the C-axis angle of the thread grinding machine at this clamping position is recorded as α. It is necessary to ensure that each workpiece is clamped in the same position. For the first workpiece of the same batch, after turning, it is clamped onto the thread grinding machine, and a thread is trial-ground at this clamping position using the same lead parameters as during turning. The thread trajectory of the trial-ground workpiece is scanned on a profilometer, and the offset between the turned thread and the trial-ground thread is measured and recorded as the thread trajectory deviation, denoted as b. Figure 6As shown. Based on the deviation of the two thread paths, the phase difference between the two threads can be calculated as b / s*360°. This is easily understood: during trial grinding, the machining spindle angle is α. After trial grinding, testing reveals a phase difference of b / s*360° between turning and trial grinding. Therefore, during finish grinding, the machining spindle angle should be offset by b / s*360° from the trial grinding spindle angle α. During trial grinding, the C-axis (i.e., the machining spindle) position is recorded as α. After tool setting and adjustment, the initial machining angle of the C-axis during grinding should be α+b / s*360° or α-b / s*360°. After determining the starting angle of the grinding spindle, the workpiece is clamped onto the thread grinder again. The rough workpiece is rotated to α+b / s*360° or α-b / s*360° according to the thread direction, thus achieving overlap between the turning and grinding paths.

[0057] As can be seen, this method is based on the machining principle and uses thread deviation compensation to solve the phase deviation that exists in the repeated positioning process of different processes. This allows the phase deviation to be compensated during the machining process to ensure accurate alignment of the machining trajectory of different processes. This method has the advantage of batch effect after one compensation, and is simple to operate, highly precise and efficient.

[0058] As mentioned above, for CNC equipment, the fine grinding angle of the workpiece can be adjusted by resetting the starting angle of the grinding process through the CNC system. For non-CNC equipment, this offset can be achieved through the following device.

[0059] Specifically, such as Figures 2 to 4 As shown in the embodiment of this application, a precise repeatable positioning device for internal thread composite processing is also provided, including a base 100, a code disk 200, a locking element, and a locking ring 500. The base 100 is used to fix on the chuck of the thread grinding machine during grinding. The end of the base 100 away from the chuck is provided with a circumferential scale 300. The code disk 200 is rotatably disposed in the base 100. The nut 700 to be processed is clamped in the code disk 200 and fixed by the locking ring 500. The code disk 200 is provided with an indicator line 400 for indicating the rotation angle. The locking element is disposed on the base 100 for locking the rotation of the code disk 200.

[0060] In the above embodiment, the nut 700 to be processed is clamped in the encoder 200. By rotating the encoder 200, the angle that the nut 700 to be processed needs to deflect after trial grinding can be adjusted, thereby ensuring that the thread trajectory of turning and grinding is accurately aligned.

[0061] In the above, one end of the base 100 is fixed to the chuck of the thread grinding machine, and the other end face of the base 100 is provided with a circumferential scale 300. The code disk 200 is supported in the base 100 by two precision support bearings, and there is an indicator line 400 on the code disk 200 to indicate the relative position of the code disk 200 and the base 100.

[0062] In a preferred embodiment, such as Figures 2 to 4 As shown, the encoder 200 includes a mounting part 201, a threaded part 203, and a clamping part 202. The mounting part 201 is connected to the base 100, the clamping part 202 is used to clamp the nut 700 to be processed, and the threaded part 203 is connected between the mounting part 201 and the clamping part 202. The mounting part 201, the threaded part 203, and the clamping part 202 are integrally formed.

[0063] In the above embodiment, the mounting part 201, the threaded part 203, and the clamping part 202 are provided with channels along the axis for inserting and clamping the nut 700 to be processed. The mounting part 201 is a cylindrical rod structure, and the base 100 is provided with a shaft hole along its axial direction. The mounting part 201 is mounted in the shaft hole through a precision bearing 101, realizing the rotatable connection between the encoder 200 and the base 100. Precision grinding of the bearing can ensure the accurate rotation angle of the encoder 200, which helps to ensure the accuracy of thread processing. The clamping part 202 is a tapered tube shape. The outer diameter of the clamping part 202 gradually increases from the end away from the threaded part 203 to the end closer to the threaded part 203 until it is the same as the outer diameter of the threaded part 203. The outer diameter of the mounting part 201 is smaller than the outer diameter of the threaded part 203. At the same time, a number of positioning grooves 204 are provided around the clamping part 202. The nut 700 to be processed is inserted into the positioning grooves 204 through positioning elements.

[0064] In the above embodiments, the positioning element preferably utilizes a feature on the outer cylindrical wall of the nut 700 to be processed. For example, in this embodiment, the pin hole already exists on the outer cylindrical wall of the nut 700 to be processed. After the nut 700 to be processed is inserted into the encoder 200, the pin hole aligns with the positioning groove 204 on the encoder 200. A positioning pin 800 is screwed into the pin hole. The size of the positioning groove 204 and the size of the positioning pin 800 are in a small clearance fit. At the same time, the nut 700 to be processed and the encoder 200 are axially fitted and tightened, ensuring that each nut to be processed is installed in the same position on the encoder 200 by the positioning pin 800, thereby ensuring the same positioning in both the axial and circumferential directions. After the nut 700 to be processed and the encoder 200 are installed and positioned, the encoder 200 and the nut to be processed are clamped and fixed by the locking ring 500 and the threaded part 203.

[0065] After clamping and fixing, in order to prevent the code disk 200 from rotating freely within the base 100, the code disk 200 is locked by a locking member. In this embodiment, the locking member is a locking screw 600 provided on the outer periphery of the base 100. By tightening the locking screw 600, the code disk 200 is locked, so the code disk 200 will not rotate freely.

[0066] Based on the above, the implementation process of using this precise repeatable positioning device in the aforementioned internal thread composite processing method is as follows:

[0067] After the nut 700 to be machined is turned, a rough blank is obtained. The rough blank is clamped in the chuck 200. The pin hole is aligned with the positioning groove 204. The positioning pin 800 is screwed into the pin hole to complete the positioning of the nut 700 to be machined. The locking ring 500 is tightened to clamp the rough blank. Then the base 100 is clamped in the chuck of the grinding machine.

[0068] Next, a thread is trial-ground using the same parameters as the turning process. The thread trajectory of the trial-ground part is scanned on the profilometer, and the offset between the turning thread and the trial-ground thread is measured. Based on the offset between the turning thread and the trial-ground thread, the phase difference between the turning thread and the trial-ground thread is obtained as b / s*360°. Then, based on the phase difference between the turning thread and the trial-ground thread, the starting angle of the grinding spindle α+b / s*360° or α-b / s*360° is obtained. The rough workpiece is rotated to α+b / s*360° or α-b / s*360° by rotating the encoder 200. Accurate grinding is achieved according to the indicator line 400 on the encoder 200 and the circumferential scale 300 on the base 100. The phase angle offset is achieved by rotating the encoder 200. After the phase angle offset is achieved, the encoder 200 can be held by the locking screw 600 on the base 100 to fix the workpiece. Then, the grinding wheel 900 can be used for thread grinding. After confirming that there is no error, the locking screw 600 of the base 100 will not be loosened in subsequent continuous processing to ensure that the encoder 200 is always in the same position. Each subsequent nut can be installed in the same way by using the positioning pin 800 to ensure that its relative position with the encoder 200 is the same. This achieves the effect of repeated and precise positioning of roughing and finishing processes, ensuring that the thread trajectory processed by roughing and finishing is precisely aligned.

[0069] It is evident that the method and apparatus proposed in this invention can achieve coordinated roughing and finishing of threads. After the first part is debugged, it can be used in batches, thereby improving processing efficiency.

[0070] For machining internal threads with a large length-to-diameter ratio, the large overhang of the grinding rod and the small single feed rate result in low efficiency and low accuracy. This method can achieve rapid roughing using turning / milling and other methods, and achieve high-precision and high-efficiency machining of internal threads with a large length-to-diameter ratio by using parallel axis grinding (i.e., the grinding rod is parallel to the axis of the nut part).

[0071] Furthermore, this method is applicable to the machining of internal threads with any number of starts. For multi-start internal thread machining, any one start can be used as a reference for secondary positioning using this method, and then CNC equipment or the positioning device proposed in this method can be used to complete the machining of multi-start threads.

[0072] It is not difficult to understand that this method and apparatus are suitable for the machining of planetary roller screw nuts, and can also be extended to the high-precision and high-efficiency machining of ball screws and similar internal thread parts.

[0073] In summary, firstly, the internal thread composite processing method proposed in this application includes: clamping the nut to be processed on a lathe, turning a rough thread to obtain a rough blank; clamping the rough blank on a grinding machine, and recording the C-axis angle of the grinding machine at the current clamping position, then trial-grinding a thread using the same parameters as the turning; scanning the thread trajectory of the trial-grinded rough blank, measuring the offset between the turned thread and the trial-grinded thread; based on the offset between the turned thread and the trial-grinded thread, obtaining the phase difference between the turned thread and the trial-grinded thread as b / s*360°, where b is the offset between the turned thread and the trial-grinded thread, and s is the lead; based on the phase difference between the turned thread and the trial-grinded thread, obtaining the starting angle of the grinding spindle α+b / s*360° or α-b / s*360°, where α is the C-axis angle when the rough blank is clamped on the grinding machine; rotating the rough blank to the starting angle of the grinding spindle; and finishing grinding to obtain a refined nut. This method utilizes thread deviation compensation to achieve accurate and repeatable positioning of the roughing-finishing trajectory. This allows for adjustment of deviation compensation during the machining process to ensure precise alignment of machining trajectories for different processes, thereby enabling coordinating roughing and finishing processes across multiple machining methods and achieving high-precision and high-efficiency machining of internal threads.

[0074] Second: This application also proposes a precise repeatable positioning device for internal thread composite machining, comprising: a base, a code disk, and a locking element. The base is used to fix itself on the chuck of a thread grinding machine during grinding. A circumferential scale is provided at the end of the base away from the chuck. The code disk is rotatably disposed within the base, and the nut to be processed is clamped and fixed within the code disk. Indicator lines for indicating the rotation angle are provided on the code disk. The locking element is disposed on the base to lock the rotation of the code disk. This device, by clamping the nut to be processed onto the code disk and rotating the code disk, can adjust the angle at which the nut needs to be deflected after trial grinding, thereby ensuring precise alignment of the thread trajectory during turning and grinding.

[0075] The above description is only a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for processing internal threads using a composite process, characterized in that, Includes the following steps: The nut to be processed is clamped on a lathe and the rough thread is machined to obtain a rough blank part. After clamping the rough blank on the grinding machine and recording the C-axis angle of the grinding machine at the current clamping position, a thread is tested using the same lead parameters as turning. The thread trajectory of the rough blank after trial grinding is scanned, and the offset between the machined thread and the trial-ground thread is measured. Based on the offset between the machined thread and the test-ground thread, the phase difference between the machined thread and the test-ground thread is obtained as b / s*360°, where b is the offset between the machined thread and the test-ground thread, and s is the lead. Based on the phase difference between the turning thread and the trial grinding thread, the starting angle of the grinding spindle is obtained as α+b / s*360° or α-b / s*360°, where α is the C-axis angle when the blank is clamped in the grinding machine. The rough blank is adjusted to the starting angle of the grinding spindle by a precise repeatable positioning device for internal thread compound processing. Precision grinding is used to obtain precision nuts.

2. The internal thread composite processing method according to claim 1, characterized in that, When rough machining threads, leave a finishing allowance of 0.1-0.2mm.

3. The internal thread composite processing method according to claim 1, characterized in that, Nuts to be processed in the same batch are clamped in the same position on the lathe.

4. The internal thread composite processing method according to claim 1, characterized in that, The rough blanks of the same batch are kept in the same clamping position on the grinding machine.

5. The internal thread composite processing method according to claim 1, characterized in that, The precise and repeatable positioning device for internal thread composite processing includes: A base for fixing to the chuck of a thread grinding machine during grinding, wherein the end of the base away from the chuck is provided with circumferential graduations; The code disk is rotatably mounted in the base, and the nut to be processed is clamped and fixed in the code disk. The code disk is provided with an indicator line for indicating the rotation angle. A locking element, which is disposed on the base, is used to lock the code disk from rotating.

6. The internal thread composite processing method according to claim 5, characterized in that, The encoder includes: The mounting part is connected to the base; A clamping part, which is used to clamp the nut to be processed; A threaded portion, which connects the mounting portion and the clamping portion.

7. The internal thread composite processing method according to claim 6, characterized in that, The mounting part is mounted in the base via a precision bearing.

8. The internal thread composite processing method according to claim 6, characterized in that, The clamping part is in the shape of a tapered tube, and several positioning grooves are provided around the circumference of the clamping part. The nut to be processed is inserted into the positioning groove by the positioning element.

9. The internal thread composite processing method according to claim 8, characterized in that, The precise repeatable positioning device for internal thread composite processing further includes a locking ring, which is used to tighten the clamping part to clamp the nut to be processed, and the locking ring is threadedly connected to the threaded part.

10. The internal thread composite processing method according to claim 5, characterized in that, The locking element is a locking screw located on the outer periphery of the base.

Images