Large thread turning and inspection method with fixed starting point
By using heavy-load CNC turning tools and fine turning steps in turning processing, combined with the inspection of tooth pitch samples and starting point samples, the problems of cumbersome and low precision in the existing technology thread processing process are solved, and efficient and accurate thread processing and reliable assembly are achieved.
Patent Information
- Application Number
- CN202210695952.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-06-20
- Publication Date
- 2025-06-20
- Estimated Expiration
- 2042-06-20
AI Technical Summary
The prior art is used to turn large threads at fixed starting points, the process is cumbersome, the processing time is long, the accuracy is low, and the measurement results are affected by human factors, and often fail to assemble due to incorrect position of the thread starting point.
The heavy-load CNC turning tool is used to ensure the machining accuracy of the thread through a series of fine turning steps, including rough, semi-finished and fine-cutting, and the machining accuracy is ensured, and the tooth pitch sample and starting point sample are used for inspection to reduce human error.
It improves thread processing efficiency and accuracy, reduces errors caused by using combined measuring tools, and ensures the quality reliability and correct assembly of threads.
Smart Images
Figure CN115121820B_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of mechanical manufacturing, and particularly relates to a large-scale thread turning processing and inspection method with a fixed starting point. Background Art
[0002] In the prior art, when turning a large-scale thread with a fixed starting point, generally, the starting point of the thread is first marked, and then a self-made welding tool is used for rough turning, heat treatment, multiple semi-finish turnings and finish turnings. During the processing, a combined caliper is needed to repeatedly measure and calculate the processing dimensions. The process is cumbersome, the processing time is long, the measurement results are affected by human factors, and the accuracy is low. Especially when processing an extra-large thread at the connection between the clamping ring and the bell mouth in a carbon press, the processing time is long and the accuracy is low. Often, due to the incorrect position of the thread starting point, assembly cannot be carried out. Summary of the Invention
[0003] To solve some or all of the technical problems existing in the above prior art, the present invention provides a large-scale thread turning processing and inspection method with a fixed starting point. The method includes the following steps:
[0004] Step 1: Select the upper end face of the part of the workpiece to be processed with the thread as the processing reference surface. Turn the workpiece over once, and use a heavy-duty CNC turning tool to rough and finish turn the thickness dimension of the part of the workpiece to be processed with the thread to the design requirements.
[0005] Step 2: Use a heavy-duty CNC turning tool to rough turn the minor diameter of the internal thread workpiece or the major diameter of the external thread workpiece, leaving a margin of 4 mm in the diameter direction.
[0006] Step 3: Determine the thread starting point, and mark the thread starting point with a line on the processing reference surface.
[0007] Step 4: Call the helical machining program, and use a heavy-duty CNC grooving tool or a 45° CNC turning tool to rough turn the thread tooth profile, leaving a margin of 1 mm on one side.
[0008] Step 5: Call the helical machining program, and use a CNC turning tool to semi-finish turn the thread tooth profile, leaving a margin of 0.5 mm on one side.
[0009] Step 6: Use a CNC turning tool to finish turn the minor diameter of the internal thread workpiece or the major diameter of the external thread workpiece to the design requirements.
[0010] Step 7: Call the helical machining program, and use a CNC turning tool to finish turn the tooth profile to the design requirements.
[0011] Step 8: Call the helical machining program, and use a 45° and arc CNC turning tool to semi-finish and finish turn the root fillet and tooth top chamfer of the tooth profile to the design requirements.
[0012] Step 9: Use a tooth profile and pitch template to inspect the tooth profile and pitch of the thread, and use a starting point template to inspect the starting point of the thread.
[0013] Further, in the above large thread turning and inspection method for fixing the starting point, in Step 1, use an outside micrometer to measure the thickness of the workpiece at multiple positions on the part to be threaded.
[0014] Further, in the above large thread turning and inspection method for fixing the starting point, in Step 1, measure the thickness of the workpiece at eight positions evenly distributed along the circumferential direction of the part to be threaded.
[0015] Further, in the above large thread turning and inspection method for fixing the starting point, in Step 4, for an internal thread workpiece, first use a grooving tool to turn the straight surface and the bottom surface of the tooth of the thread, and finally turn the inclined surface of the thread; for an external thread workpiece, first use a grooving tool to turn the straight surface of the thread, then use an arc turning tool to turn the fillet at the bottom of the tooth of the thread, and finally turn the inclined surface of the thread.
[0016] Further, in the above large thread turning and inspection method for fixing the starting point, in Step 5, for an internal thread workpiece, first turn the straight surface and the bottom surface of the tooth of the thread, and finally turn the inclined surface of the thread; for an external thread workpiece, first turn the straight surface of the thread, then turn the fillet at the bottom of the tooth of the thread, and finally turn the inclined surface of the thread.
[0017] Further, in the above large thread turning and inspection method for fixing the starting point, in Step 6, use a caliper to measure the minor diameter of the internal thread workpiece or the major diameter of the external thread workpiece.
[0018] Further, in the above large thread turning and inspection method for fixing the starting point, in Step 7, for an internal thread workpiece, first turn the straight surface and the bottom surface of the tooth of the thread, and finally turn the inclined surface of the thread; for an external thread workpiece, first turn the straight surface of the thread, then turn the fillet at the bottom of the tooth of the thread, and finally turn the inclined surface of the thread.
[0019] Further, in the above large thread turning and inspection method for fixing the starting point, in Step 8, for an internal thread workpiece, the fillet radius at the root of the tooth profile is R1.2 mm, and the chamfer specification at the tooth top is 2×45°; for an external thread workpiece, the fillet radius at the root of the tooth profile is R49.5 mm, and the chamfer specification at the tooth top is 2×45°.
[0020] Further, in the above large thread turning and inspection method for fixing the starting point, add a step of performing short-term aging treatment on the workpiece between Step 4 and Step 5.
[0021] The large-scale thread turning and inspection method with a fixed starting point of the present invention has the following advantages and beneficial effects: Using a heavy-duty CNC grooving turning tool and 45° and arc CNC turning tools for efficient thread turning, improving the thread processing efficiency and processing accuracy; using a tooth profile and pitch template to inspect the tooth profile and pitch of the thread, and using a starting point template to inspect the starting point of the thread, reducing the error generated by using a combined measuring tool caliper, improving the inspection accuracy and inspection efficiency, and ensuring reliable quality. Brief Description of the Drawings
[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings. In the drawings:
[0023] Figure 1 is a process schematic diagram of Step 1 in the large-scale thread turning and inspection method with a fixed starting point of the present invention;
[0024] Figure 2 is a process schematic diagram of Step 2 in the large-scale thread turning and inspection method with a fixed starting point of the present invention;
[0025] Figure 3 is a process schematic diagram of Step 3 in the large-scale thread turning and inspection method with a fixed starting point of the present invention;
[0026] Figure 4 is a process schematic diagram of Step 4 in the large-scale thread turning and inspection method with a fixed starting point of the present invention;
[0027] Figure 5 is a process schematic diagram of Step 5 in the large-scale thread turning and inspection method with a fixed starting point of the present invention;
[0028] Figure 6 is a process schematic diagram of Step 6 in the large-scale thread turning and inspection method with a fixed starting point of the present invention;
[0029] Figure 7 is a process schematic diagram of Step 7 in the large-scale thread turning and inspection method with a fixed starting point of the present invention;
[0030] Figure 8 is a process schematic diagram of Step 8 in the large-scale thread turning and inspection method with a fixed starting point of the present invention;
[0031] Figure 9 is a process schematic diagram of Step 9 in the large-scale thread turning and inspection method with a fixed starting point of the present invention. Specific Embodiment
[0032] To make the objectives, technical solutions and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions of the present invention in conjunction with specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present invention.
[0033] The large-scale thread turning and inspection method with a fixed starting point of the present invention includes the following steps:
[0034] Step 1: As Figure 1 shown, select the upper end face A of the threaded part L to be machined on the workpiece as the machining reference surface, turn the workpiece once, and use a heavy-duty CNC turning tool to rough and finish turn the thickness dimension of the threaded part L to be machined on the workpiece to the design requirements.
[0035] Step 2: As Figure 2 shown, use a heavy-duty CNC turning tool to rough turn the minor diameter φ of the internal threaded workpiece or the major diameter Φ of the external threaded workpiece, leaving a margin of 4 mm in the diameter direction.
[0036] Step 3: As Figure 3 shown, determine the thread starting point C and mark the thread starting point C on the machining reference surface A with a line.
[0037] Step 4: As Figure 4 shown, call the helical machining program and use a heavy-duty CNC grooving tool or a 45° CNC turning tool to rough turn the thread profile, leaving a margin of 1 mm on one side.
[0038] Step 5: As Figure 5 shown, call the helical machining program and use a CNC turning tool to semi-finish turn the thread profile, leaving a margin of 0.5 mm on one side.
[0039] Step 6: As Figure 6 shown, use a CNC turning tool to finish turn the minor diameter φ of the internal threaded workpiece or the major diameter Φ of the external threaded workpiece to the design requirements.
[0040] Step 7: As Figure 7 shown, call the helical machining program and use a CNC turning tool to finish turn the tooth profile to the design requirements.
[0041] Step 8: As Figure 8 shown, call the helical machining program and use a 45° and arc CNC turning tool to semi-finish and finish turn the root fillet and tooth tip chamfer of the tooth profile to the design requirements.
[0042] Step 9: As Figure 9As shown in the figure, a tooth profile and pitch template 1 is used to inspect the tooth profile and pitch of the thread, and a starting point template 2 is used to inspect the starting point of the thread.
[0043] As a specific implementation, in step 1, an outside micrometer can be used to detect the thickness of the workpiece at multiple positions B of the to-be-machined thread part L to ensure that the thickness dimension of the to-be-machined thread part L of the workpiece meets the design requirements. For example, the thickness of the to-be-machined thread part L is detected at eight positions such as 1, 2, 3, 4, 5, 6, 7, and 8 that are equally spaced along the circumferential direction of the to-be-machined thread part L of the workpiece.
[0044] As a specific implementation, in step 4, for an internal thread workpiece, first use a grooving tool to machine the straight surface and the bottom surface of the tooth of the thread, and finally machine the inclined surface of the thread; for an external thread workpiece, first use a grooving tool to machine the straight surface of the thread, then use an arc turning tool to machine the fillet at the bottom of the tooth of the thread, and finally machine the inclined surface of the thread.
[0045] As a specific implementation, in step 5, for an internal thread workpiece, first machine the straight surface and the bottom surface of the tooth of the thread, and finally machine the inclined surface of the thread; for an external thread workpiece, first machine the straight surface of the thread, then machine the fillet at the bottom of the tooth of the thread, and finally machine the inclined surface of the thread.
[0046] As a specific implementation, in step 6, a caliper can be used to detect the minor diameter φ of the internal thread workpiece or the major diameter Φ of the external thread workpiece to ensure that the minor diameter φ of the internal thread workpiece and the major diameter Φ of the external thread workpiece meet the dimensional accuracy requirements of the design.
[0047] As a specific implementation, in step 7, for an internal thread workpiece, first machine the straight surface and the bottom surface of the tooth of the thread, and finally machine the inclined surface of the thread; for an external thread workpiece, first machine the straight surface of the thread, then machine the fillet at the bottom of the tooth of the thread, and finally machine the inclined surface of the thread.
[0048] As a specific implementation, in step 8, for an internal thread workpiece, the fillet radius specification at the root of the tooth profile is R1.2 mm, and the chamfer specification at the tooth top is 2×45°; for an external thread workpiece, the fillet radius specification at the root of the tooth profile is R49.5 mm, and the chamfer specification at the tooth top is 2×45°.
[0049] As a specific implementation, a step of performing short-term aging treatment on the workpiece is added between step 4 and step 5.
[0050] In summary, compared with the prior art, the large-scale thread turning machining and inspection method for fixing the starting point of the present invention has the following advantages and beneficial effects:
[0051] Use a heavy-duty CNC grooving tool, a 45° and an arc CNC turning tool to efficiently machine the thread, improving the thread machining efficiency and machining accuracy;
[0052] The tooth profile and pitch of the thread are inspected using a tooth profile and pitch template, and the starting point of the thread is inspected using a starting point template, which reduces the errors generated by using a combined measuring tool caliper, improves the inspection accuracy and efficiency, and has reliable quality.
[0053] It should be noted that in this text, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, in this text, the term "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or device. In addition, unless otherwise specified, "front", "rear", "left", "right", "upper", "lower", "inner", "outer", etc. in this text are referenced to the placement state shown in the drawings.
[0054] It should also be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.
Claims
1. A large-scale thread turning and inspection method with a fixed starting point, characterized in that, The large-scale thread turning and inspection method for fixing the starting point includes the following steps: Step 1: Select the upper end face of the workpiece's thread part to be machined as the machining reference surface. Turn the workpiece over once, and use a heavy-duty CNC turning tool to rough and finish turn the thickness dimension of the workpiece's thread part to be machined to the design requirements. Step 2: Use a heavy-duty CNC turning tool to rough turn the minor diameter of the internal thread workpiece or the major diameter of the external thread workpiece, leaving a 4-mm allowance in the diameter direction. Step 3: Determine the thread starting point and mark the thread starting point on the machining reference surface with a line. Step 4: Call the helical interpolation program, and use a heavy-duty CNC grooving tool or a 45° CNC turning tool to rough turn the thread profile, leaving a 1-mm allowance on one side. Step 5: Call the helical interpolation program, and use a CNC turning tool to semi-finish turn the thread profile, leaving a 0.5-mm allowance on one side. Step 6: Use a CNC turning tool to finish turn the minor diameter of the internal thread workpiece or the major diameter of the external thread workpiece to the design requirements. Step 7: Call the helical interpolation program, and use a CNC turning tool to finish turn the tooth profile to the design requirements. Step 8: Call the helical interpolation program, and use a 45° and arc CNC turning tool to semi-finish and finish turn the root fillet and tooth top chamfer of the tooth profile to the design requirements. Step 9: Use a tooth profile and pitch template to inspect the tooth profile and pitch of the thread, and use a starting point template to inspect the starting point of the thread. In Step 4, for an internal thread workpiece, first use a grooving tool to machine the thread straight surface and tooth bottom surface, and finally machine the thread inclined surface; for an external thread workpiece, first use a grooving tool to machine the thread straight surface, then use an arc turning tool to machine the root fillet of the thread tooth, and finally machine the thread inclined surface. In Step 5, for an internal thread workpiece, first machine the thread straight surface and tooth bottom surface, and finally machine the thread inclined surface; for an external thread workpiece, first machine the thread straight surface, then machine the root fillet of the thread tooth, and finally machine the thread inclined surface. In Step 7, for an internal thread workpiece, first machine the thread straight surface and tooth bottom surface, and finally machine the thread inclined surface; for an external thread workpiece, first machine the thread straight surface, then machine the root fillet of the thread tooth, and finally machine the thread inclined surface. Add a step of performing short-term aging treatment on the workpiece between Step 4 and Step 5.
2. The large-scale thread turning and inspection method with a fixed starting point according to claim 1, characterized in that, In Step 1, use an outside micrometer to measure the thickness of the workpiece's thread part to be machined at multiple positions.
3. The large-scale thread turning and inspection method with a fixed starting point according to claim 2, characterized in that, In Step 1, measure the thickness of the workpiece's thread part to be machined at eight equally spaced positions along the circumferential direction of the workpiece's thread part to be machined.
4. The large-scale thread turning and inspection method with a fixed starting point according to claim 1, characterized in that, In Step 6, use a caliper to measure the minor diameter of the internal thread workpiece or the major diameter of the external thread workpiece.
5. The large-scale thread turning and inspection method with a fixed starting point according to claim 1, characterized in that, In Step 8, for an internal thread workpiece, the root fillet specification of the tooth profile is R1.2 mm, and the tooth top chamfer specification is 2×45°; for an external thread workpiece, the root fillet specification of the tooth profile is R49.5 mm, and the tooth top chamfer specification is 2×45°.
Citation Information
Patent Citations
Steep-pitch thread fabrication technique
CN101298107A
Large root fillet uniform-strength thread and machining method thereof
CN112576594A