A method of deburring a start buckle with a thread cutter

Abstract

The application discloses a method for repairing a starting buckle burr by using a thread cutter, including two implementation modes of automatic grinding by machine clamping a thread cutter and manual grinding by manually using a thread cutter, both of which adopt original thread cutters for thread processing, and core parameters of grinding and cutting are unified, and one can be selected according to a production scene; the automatic grinding is online processing of a lathe, and the manual grinding is offline / on-site operation, the grinding / cutting length of both modes is 0.5-2 times of a pitch of a starting section of the thread, and the radial cutting depth / grinding depth is 0 mm. The method for repairing a starting buckle burr by using a thread cutter utilizes the same original thread cutter to complete thread processing and starting buckle burr trimming, and the method takes into account processing efficiency, grinding accuracy and scene adaptability, eliminates burr defects and solves the problems of single scene and poor adaptability in the prior art.

Description

Technical Field

[0001] This invention belongs to the fields of CNC machining technology and mechanical processing technology, and particularly relates to a method for removing burrs from the starting thread using a thread cutter. It is especially suitable for machining external and internal threads of oil pipes, sleeves, pipe fittings, and various shaft parts on CNC lathes and conventional lathes, providing an online automatic or offline manual method for removing burrs, flash, and incomplete thread profiles from the starting thread. This method includes two implementations: automatic regrinding of the thread cutter using a machine clamp and manual regrinding using a thread cutter. Both utilize the thread cutter body to remove burrs, flash, and incomplete thread profiles from the starting section of the thread (0.5 to 2 times the thread pitch) while ensuring machining adaptability. Automatic regrinding can be completed after a single workpiece clamping, while manual regrinding is suitable for offline small-batch / emergency machining scenarios. Both methods feature no need to use additional special tools, no risk of thread damage, stable machining quality, and strong versatility, making them suitable for precision machining of various internal and external threads, especially for mass production and small-batch customized machining of high-precision threaded parts such as oil pipes, sleeves, and pipe fittings. Background Technology

[0002] During thread turning, the tool experiences a sudden change in force upon entering the workpiece, and the initial section has an incomplete thread profile, making it highly susceptible to burrs, flash, and sharp corners at the thread's starting point. These defects directly affect thread assembly performance, easily causing assembly scratches, poor sealing, and non-compliance of go / no-go gauges. Common methods for removing burrs from the starting thread are as follows: 1. Manual polishing with files and sandpaper: Low efficiency, poor consistency, easily damages thread profile accuracy, cannot meet batch production requirements, and does not utilize the original thread cutting tool, resulting in poor tool compatibility; 2. Replacing with a grooving tool or a dedicated deburring tool: Requires multiple tool positions, increases tool changing and setting time, and is prone to helical trajectory misalignment, leading to risks such as misaligned threads and damaged thread profiles; 3. Using dedicated deburring equipment: High cost, large footprint, unsuitable for online, one-time clamping processing; 4. Existing grinding methods do not differentiate between automated batch processing and small-batch / emergency offline processing scenarios, lacking tiered grinding solutions adapted to different production needs. Either they are highly automated but have poor adaptability, or they are flexible in manual operation but difficult to guarantee accuracy. In summary, existing technologies generally suffer from problems such as cumbersome procedures, low efficiency, unstable quality, easy thread breakage, and poor adaptability to different scenarios. They are unable to simultaneously meet the requirements of high-precision / high-efficiency / high-consistency batch thread processing, as well as the flexible grinding requirements of small-batch, customized, and emergency processing. Summary of the Invention

[0003] The purpose of this invention is to provide a method for repairing burrs on the starting thread using a thread cutter. It offers two implementation methods: automated machine clamping and manual hand-held grinding. This allows for adaptation to automated mass production, small-batch / emergency / offline processing scenarios without changing specialized tools or compromising thread profile accuracy. The same original thread cutter is used to complete both thread processing and burr removal on the starting thread, balancing processing efficiency, grinding accuracy, and scenario adaptability. This eliminates burr defects and addresses the limitations of existing technologies, such as limited application scenarios and poor adaptability.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] This invention discloses a method for removing burrs from the starting thread using a thread cutter, comprising two implementation methods: automatic shaving with a machine-mounted thread cutter and manual shaving with a thread cutter. Both methods use the original thread cutter from the thread processing plant, and the core parameters for shaving / cutting are consistent, allowing selection based on the production scenario. The automatic shaving is performed online on a lathe, while the manual shaving is performed offline / on-site. The shaving / cutting length for both methods is 0.5 to 2 times the thread pitch at the starting point, and the radial cutting depth / grinding depth is 0 mm.

[0006] Furthermore, the automatic regrinding steps of the machine clamping thread cutter are as follows: 1) Clamp the workpiece and align it with the thread cutter to determine the machining origin; 2) Use the thread cutter to complete the cutting of the entire thread section according to preset parameters to achieve the final size; 3) Keep the thread cutter, spindle speed, pitch, starting point and machining trajectory unchanged; 4) The tool returns to the original starting point and performs a short-stroke, zero radial allowance light cutting and polishing of the starting section of the thread along the original helical trajectory; 5) Retract the tool to complete the burr removal.

[0007] Furthermore, the manual refinishing steps using a thread cutter are as follows: 1) Select the original thread cutter for thread processing and clean the cutting edge; 2) Fix the workpiece to be refinished to ensure no displacement during the refinishing process; 3) Manually hold the thread cutter and make the cutting edge fit with the tooth profile of the starting section of the thread, aligning it with the original helical trajectory; 4) Lightly grind and polish the starting section of the thread with zero radial allowance, repeating the refinishing 1 to 3 times; 5) Remove the workpiece, clean up the debris, and complete the burr removal.

[0008] Furthermore, during trimming / grinding, the radial feed ceases, and the X-axis coordinate (automatic grinding) or the cutting edge contact position (manual grinding) is consistent with the final thread size.

[0009] Furthermore, the machine automatically grinds the thread cutter, and the grinding process is the same as the original thread processing speed, pitch, starting point, and spiral trajectory, without producing misaligned threads.

[0010] Furthermore, the automatic threading tool regrinding with machine clamping is suitable for online automated batch processing on CNC lathes or ordinary lathes, while the manual threading tool regrinding is suitable for small batch processing, offline emergency repairs, and processing scenarios where there is no machine tool assistance on site.

[0011] Furthermore, both implementation methods are applicable to the trimming of burrs on the initial threads of external or internal threads.

[0012] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0013] This invention provides an efficient method for deburring the starting thread of a thread using a thread-cutting tool, adaptable to different scenarios. By setting up both automatic and manual deburring methods, it achieves precise adaptation to various production scenarios. The overall beneficial effects are as follows: 1) Tool universality: Both methods use the original thread-cutting tool, eliminating the need to replace grooving tools or special deburring tools, saving tool changing and setting processes, and reducing tool costs; 2) No risk of thread damage: Both methods involve deburring / cutting along the original thread helical trajectory, fundamentally avoiding thread damage and misalignment caused by trajectory misalignment, ensuring thread accuracy; 3) Full scenario coverage: Automatic deburring is suitable for large-scale automated production, while manual deburring is suitable for small-batch production. / Emergency / offline processing solves the problem that existing single-method technology cannot meet different production needs; 4) Stable quality: Both methods use zero radial allowance grinding / cutting, only removing burr defects without changing the effective thread size. The tooth profile is complete after grinding, and the pass rate of go and no-go gauges is high; 5) Strong versatility: Automatic grinding is suitable for CNC lathes and ordinary lathes, and manual grinding has no equipment restrictions. Both methods are suitable for external and internal thread starting burr trimming, with a wide range of applications; 6) Improved efficiency: Automatic grinding achieves a batch processing efficiency improvement of more than 30%, and manual grinding efficiency is far higher than traditional files and sandpaper polishing, balancing efficiency and flexibility. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings.

[0015] Figure 1 This is a comparison of the thread profiles before and after the initial thread is ground. Detailed Implementation

[0016] A method for removing initial burrs using a thread cutter includes two implementation methods: automatic shaving of the thread cutter using a machine clamped in place, and manual shaving using a thread cutter. The method can be selected based on the production scenario. Both methods use the original thread cutter provided with the thread processing machine, and the core cutting parameters are consistent. The specific steps are as follows:

[0017] Method 1: Automatic Threading Tool Grinding with Machine Clamping (Suitable for CNC / Conventional Lathe Online Automated Batch Machining) 1) Workpiece Clamping and Tool Setting: Clamp the workpiece on the lathe, install the threading tool, complete the X and Z axis tool setting, and determine the machining origin; 2) Normal Thread Cutting Machining: According to the preset thread parameters, complete the full length cutting of the thread through CNC program or conventional turning method to achieve the final size; 3) Keeping Machining Conditions Unchanged: Do not change the threading tool, spindle speed, pitch, starting point position, or machining coordinate system, ensuring complete synchronization with the original thread machining trajectory; 4) Short Stroke Zero Residue Trimming of the Starting Thread: The tool returns to the original starting point and performs zero radial allowance light trimming of the starting section of the thread along the original helical trajectory for 0.5 to 2 times the pitch length, removing only the starting thread burrs, flash, and incomplete tooth profile, without changing the effective thread size; 5) Retraction to Complete Machining: After trimming, the tool quickly retracts to complete all machining.

[0018] Method 2: Manual refinishing using a thread cutter (suitable for small batch / emergency processing / offline rework scenarios)

[0019] 1) Tool preparation: Select the original thread cutter for this thread machining, clean the cutting edge of the tool to ensure that the cutting edge is intact and undamaged;

[0020] 2) Workpiece positioning: Place the threaded workpiece to be repaired on the tooling fixture or operating platform, fix the threaded workpiece, and ensure that the workpiece does not shift or shake during the repair process; 3) Repair parameter calibration: Manually hold the thread cutter and make the cutting edge of the cutter completely fit the tooth profile of the starting section of the thread, align it with the thread helix trajectory, and determine the repair range as 0.5 to 2 times the pitch length of the starting section of the thread.

[0021] 4) Zero-reserve manual finishing: Along the original spiral trajectory of the thread, the starting thread is lightly ground and finished with zero radial allowance. The finishing is done 1 to 3 times to remove only burrs, flash and incomplete tooth profile without changing the effective thread size.

[0022] 5) Workpiece inspection: After grinding, remove the workpiece, clean up the grinding debris, and complete the burr removal.

[0023] Key process parameters (applicable to both methods):

[0024] - Trimming / grinding length: 0.5 to 2 times the thread pitch at the beginning of the thread;

[0025] - Radial depth of cut / grind depth: 0mm, consistent with the final thread dimension;

[0026] - Number of trimming / grinding operations: 1 to 3 times;

[0027] -Core compatibility requirements: All use the original thread cutting tool for thread processing, and the grinding / cutting trajectory is consistent with the original thread processing helical trajectory.

[0028] The core applicability, advantages, and disadvantages of the implementation method

[0029] Implementation Core Applicability advantage shortcoming Automatic regrinding of thread cutting tools in machine clamping Online machining on CNC lathes / conventional lathes, mass production of high-precision threaded parts, and integration of automated production lines. 1. One-cut machining eliminates tool changing and setting steps; 2. Completely synchronized helical trajectory eliminates the risk of tooth misalignment; 3. High machining efficiency, reducing single-piece machining time by more than 30%; 4. Strong consistency in grinding, high tooth profile accuracy, and 100% pass rate for go / no-go gauges; 5. Enables automated continuous production, adaptable to large-volume processing needs. 1. Requires lathe equipment and cannot be used for offline grinding without the machine tool; 2. Requires high workpiece clamping accuracy and is not suitable for emergency rework without clamping conditions; 3. The equipment debugging cost is relatively high for small batch processing. Manual grinding using a thread cutter Small-batch thread processing, offline emergency repair, on-site machining without machine tool assistance, and customized thread grinding. 1. No machine tool required, flexible operation, enabling offline / on-site grinding; 2. Low tooling requirements, only simple clamps are needed to fix the workpiece, resulting in low equipment cost; 3. Suitable for grinding small batches of threaded parts of various specifications, with flexible adjustment; 4. Can quickly respond to emergency repair needs, with grinding efficiency higher than traditional file / sandpaper polishing. 1. The precision of regrinding depends on manual operation skills, and the consistency is slightly lower than that of automatic regrinding; 2. The processing efficiency is lower than that of automatic regrinding, making it unsuitable for large-scale continuous production; 3. It requires certain skills from operators in thread profile recognition and tool handling.

[0030] The two embodiments of the present invention will be further described in detail below with reference to specific examples.

[0031] Example 1: External thread starting burr trimming - automatic grinding of thread cutter using machine clamping

[0032] Workpiece: Oil pipe coupling, thread specification M20×2.5;

[0033] Equipment: CNC lathe;

[0034] Cutting tool: External threading tool;

[0035] Processing steps:

[0036] 1. Clamp the workpiece, set the threading tool, and determine the X and Z origins;

[0037] 2. Execute the normal thread machining procedure:

[0038] G0 X22.0 Z3.0

[0039] G92 X19.4 Z-30.0 F2.5

[0040] X19.0

[0041] X18.6

[0042] X18.4

[0043] X18.3

[0044] 3. Keep the rotation speed, pitch, and tool constant, and return to the starting point;

[0045] 4. Perform the initial burr trimming procedure:

[0046] G92 X18.3 Z-2.0 F2.5

[0047] G92 X18.3 Z-2.0 F2.5

[0048] 5. The tool is quickly retracted, and the machining is completed.

[0049] Results: burrs and flash at the beginning of the thread were completely removed, the tooth profile was clear and complete, the go gauge and no-go gauge passed the inspection, the surface quality met the requirements for batch use of oil pipes and casings, and the processing time for a single piece was shortened by 35% compared with the traditional tool changing and grinding.

[0050] Example 2: Thread burr removal at the start of internal threads – manual grinding using a thread cutter

[0051] Workpiece: Pipe fitting, thread specification M16×2 (internal thread)

[0052] Cutting tool: The original internal thread cutting tool for machining this pipe fitting.

[0053] Grinding steps:

[0054] 1. Clean the cutting edge of the internal thread cutting tool to ensure that there are no rolled edges or impurities on the cutting edge;

[0055] 2. Place the pipe fitting on a simple tooling fixture and clamp it in place to ensure that there is no displacement during grinding;

[0056] 3. Manually hold the internal thread cutting tool and make the cutting edge of the tool precisely fit the tooth profile of the starting section of the internal thread, align it with the helical trajectory, and determine the grinding length to be 1 pitch (2mm); 4. Along the original helical trajectory, lightly grind the starting thread twice with zero radial allowance, only removing burrs and incomplete tooth profiles;

[0057] 5. Remove the pipe fitting, clean the internal grinding debris, and the grinding is complete.

[0058] Results: burrs and flash at the beginning of the thread were completely removed, the thread profile accuracy met the usage requirements, the go / no-go gauge passed the inspection, and the grinding efficiency was improved by more than 60% compared with traditional file polishing, making it suitable for offline grinding needs of small batches of pipe fittings.

[0059] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A method for removing initial burrs using a thread cutter, characterized in that, The method includes two implementations: automatic regrinding of thread cutters using machine clamping and manual regrinding using thread cutters. Both methods use the original thread cutters provided with the thread processing equipment, and the core parameters for regrinding / cutting are unified. One method can be selected according to the production scenario. The automatic regrinding is carried out in-line machining on a lathe, while the manual regrinding is carried out offline / on-site. The regrinding / cutting length for both methods is 0.5 to 2 times the thread pitch at the beginning of the thread, and the radial cutting depth / grinding depth is 0 mm.

2. The method for removing initial burrs using a thread cutter according to claim 1, characterized in that, The automatic regrinding steps of the machine for clamping the thread cutter are as follows: 1) Clamp the workpiece and align it with the thread cutter to determine the machining origin; 2) Use the thread cutter to complete the cutting of the entire thread section according to the preset parameters to achieve the final size; 3) Keep the thread cutter, spindle speed, pitch, starting point and machining trajectory unchanged; 4) Return the tool to the original starting point and perform a short-stroke, zero radial allowance light cutting and polishing of the starting section of the thread along the original helical trajectory; 5) Retract the tool to complete the burr removal.

3. The method for removing initial burrs using a thread cutter according to claim 1, characterized in that, The steps for manual thread grinding using a thread cutter are as follows: 1) Select the original thread cutter for thread processing and clean the cutting edge; 2) Fix the workpiece to be ground to ensure no displacement during the grinding process; 3) Manually hold the thread cutter and make the cutting edge fit with the tooth profile of the starting section of the thread, aligning it with the original helical trajectory; 4) Lightly grind and polish the starting section of the thread with zero radial allowance, grinding 1 to 3 times; 5) Remove the workpiece, clean up the debris, and complete the burr removal.

4. The method for removing initial burrs using a thread cutter according to claim 1, characterized in that, During trimming / grinding, radial feed ceases, and the X-axis coordinate or cutting edge contact position aligns with the final thread dimension.

5. The method for removing initial burrs using a thread cutter according to claim 1, characterized in that, The machine automatically grinds the thread cutter, and the grinding process is the same as the original thread processing in terms of speed, pitch, starting point, and spiral trajectory, thus avoiding thread breakage.

6. The method for removing initial burrs using a thread cutter according to claim 1, characterized in that, The machine-mounted automatic threading tool regrinding method is suitable for online automated batch processing on CNC lathes or ordinary lathes, while the manual threading tool regrinding method is suitable for small batch processing, offline emergency repairs, and processing scenarios where there is no machine tool assistance on site.

7. The method for removing initial burrs using a thread cutter according to claim 1, characterized in that, Both implementation methods are suitable for trimming burrs on the initial threads of external or internal threads.

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