Machining method of bent pipe part
Through the auxiliary body design and multi-process combination processing method, the problem of slipping and deformation of bent pipe parts during processing is solved, and high-precision and low-cost processing effects are achieved.
Patent Information
- Application Number
- CN202511038326.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-28
- Publication Date
- 2025-09-23
AI Technical Summary
Existing processing methods make it difficult to effectively fix metal pipes, causing the bent pipe parts to easily slip and shift during the processing, affecting accuracy and increasing costs.
An auxiliary body design is adopted, including auxiliary surfaces, auxiliary ribs and auxiliary frames. Through CNC, EDM and wire cutting process steps, combined with vacuum heat treatment and cryogenic treatment, the auxiliary body is gradually removed to improve processing accuracy.
It effectively reduces the processing difficulty, reduces deformation, significantly improves the processing accuracy and success rate of bent pipe parts, and reduces costs.
Smart Images
Figure CN120680256A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of parts processing, and in particular to a processing method for bent pipe parts. Background Art
[0002] With the development of society and technology, various types of pipe bending parts are widely used in industry. Conventional processing methods cannot effectively fix the metal pipe during processing. The relatively smooth metal pipe is not easy to clamp, making it easy to slip and shift during processing. This not only greatly reduces the accuracy of the pipe bending, but also damages the surface of the pipe. Therefore, existing processing methods are difficult to use when bending pipes, are prone to deformation, and are difficult to control processing accuracy. The success rate of processing is low and the cost is high. Summary of the Invention
[0003] In order to solve the existing technical problems, the embodiment of the present application provides a method for processing a bent pipe part. The technical solution is as follows:
[0004] In a first aspect, a method for processing a bent pipe part is provided, comprising the following steps:
[0005] Cut the material according to the preset size to obtain the processed blank;
[0006] CNC processing is performed on the blank according to the designed auxiliary body to obtain an auxiliary body connected with the bent pipe part, wherein the auxiliary body includes an auxiliary surface, auxiliary ribs and an auxiliary frame;
[0007] Removing the auxiliary ribs and the auxiliary frame by wire cutting;
[0008] The textured surface is processed by using EDM with the auxiliary surface as the reference surface, and then the smooth surface is processed by CNC, and finally the auxiliary surface is removed by wire cutting.
[0009] Furthermore, the blank is CNC-processed according to the designed auxiliary body to obtain the auxiliary body connected with the bent pipe part, including:
[0010] According to the size of the elbow part, use CNC to roughen the two sides of the blank, and reserve 0.5mm on one side of the elbow part;
[0011] The blank is subjected to vacuum heat treatment and then to cryogenic treatment;
[0012] Use a grinder to make a right angle, leaving 0.1mm on one side;
[0013] CNC was used to roughen the two sides of the blank for the second time, leaving 0.1mm on one side, and the blank was left for 12 hours to eliminate internal stress.
[0014] Furthermore, the hardness of the blank after the vacuum heat treatment is HRC50-52 degrees.
[0015] Furthermore, the cryogenic treatment temperature is -196°C.
[0016] Furthermore, the wire cutting to remove the auxiliary ribs and the auxiliary frame includes:
[0017] Cutting the connection between the auxiliary rib and one end of the bent pipe part by wire cutting;
[0018] Heat treatment again;
[0019] Use a grinder to correct the shape of the bent pipe parts with an accuracy of <0.005mm;
[0020] Use CNC to finish the two sides of the elbow parts according to the size of the parts, with an accuracy of <0.01mm;
[0021] The auxiliary ribs and the auxiliary frame are removed by wire cutting.
[0022] Furthermore, the use of EDM to process the textured surface with the auxiliary surface as the reference surface includes: using EDM to process the VDI18 textured surface with the auxiliary surface as the reference surface, with an accuracy of less than 0.01 mm.
[0023] Furthermore, the wire cutting to remove the auxiliary surface includes: using a wire cutting method of cutting one and trimming two to remove the auxiliary surface without a wire head.
[0024] Furthermore, before blanking according to the preset size, the method further includes:
[0025] An auxiliary body is designed according to the shape of the bent pipe part, and the auxiliary body serves as a processing reference surface for subsequent processing.
[0026] Furthermore, the blank is Swedish S136A.
[0027] Furthermore, the blank composition is C 0.38%, Si 0.8%, Mn 0.5%, Cr13.6%, V<0.03%, S<0.03%, and Fe balance.
[0028] The beneficial effects of the technical solution provided by the embodiment of the present application are as follows: the processing method of the bent pipe part of the present application cuts the material according to the preset size to obtain a processed blank; the blank is CNC-processed according to the designed auxiliary body to obtain an auxiliary body connected to the bent pipe part, the auxiliary body including an auxiliary surface, auxiliary ribs and an auxiliary frame; the auxiliary ribs and the auxiliary frame are removed by wire cutting; the textured surface is processed using EDM with the auxiliary surface as the reference surface, and then the smooth surface is processed using CNC, and finally the auxiliary surface is removed by wire cutting. The processing method of the bent pipe part of the present application reduces the degree of deformation during processing by rationally selecting materials; adds auxiliary bodies when designing parts to effectively reduce the difficulty of processing; uses different processes during the processing to eliminate internal stress; and overcomes the problem of deformation in the previous processing of similar parts through the rational arrangement of processes, and significantly improves the processing accuracy. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.
[0030] Figure 1 is a schematic diagram of an auxiliary body provided in an embodiment of the present application;
[0031] Figure 2 This is a schematic diagram of an auxiliary surface provided in an embodiment of the present application;
[0032] Figure 3 This is a schematic diagram of a bent pipe part provided in an embodiment of the present application. DETAILED DESCRIPTION
[0033] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.
[0034] It should be clear that the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.
[0035] When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are merely examples of devices and methods consistent with certain aspects of the present application, as detailed in the appended claims.
[0036] In the description of this application, it should be understood that the terms "first," "second," "third," etc., are used only to distinguish similar objects and are not necessarily used to describe a specific order or precedence, nor should they be understood to indicate or imply relative importance. In the description of this application, unless otherwise specified, "plurality" means two or more.
[0037] Example
[0038] like Figure 1-3 As shown, the bending pipe part processing method of the present application includes the following steps:
[0039] (1) The auxiliary body 10 is designed in advance according to the shape of the bent pipe. The auxiliary body 10 can be used as a processing reference surface for subsequent processing.
[0040] (2) Select high-purity Swedish S136A steel with good machinability and cut it according to the preset size to obtain the processing blank. The steel composition contains C 0.38%, Si 0.8%, Mn 0.5%, Cr 13.6%, V < 0.03%, S < 0.03%, and Fe as the balance.
[0041] (3) According to the designed auxiliary body 10, the blank is CNC-processed to obtain the auxiliary body 10 connected with the bent pipe part 20, the auxiliary body 10 includes an auxiliary surface 11, auxiliary ribs 12 and an auxiliary frame 13 (such as Figure 1 shown).
[0042] ① According to the size of the elbow part 20, use a CNC milling cutter with a diameter of φ6mm to roughen the two sides of the blank along both sides of the elbow part 20, and reserve 0.5mm on both sides of the elbow part 20.
[0043] ② The blank is vacuum heat treated. Heat treatment is a technique that modifies the internal structure and properties of a material by controlling the heating, insulation, and cooling processes in the solid state. Heat treatment can achieve a hardness of HRC 50-52. After heat treatment, cryogenic treatment is performed. Using the latent heat of vaporization of liquid nitrogen and the heat absorbed by low-temperature nitrogen, the treatment temperature can reach -196°C, ultimately achieving a consistent overall steel composition.
[0044] ③ Use a grinder to make a right angle, leaving 0.1mm on one side.
[0045] ④ Use a CNC 4mm diameter, R2mm ball cutter and a φ6mm diameter milling cutter to perform secondary roughing along both sides of the elbow part 20 on both sides of the blank, leaving 0.1mm on each side of the elbow part 20, and place it at room temperature for 12 hours to eliminate internal stress.
[0046] 4. Cut the connection between the auxiliary rib 12 and one end of the bent pipe part 20 by wire cutting.
[0047] 5. Heat treatment again, further eliminating internal stress through tempering to achieve deep elimination of internal stress.
[0048] 6. Use 3D measuring equipment to measure the shape data of the bent pipe, and use a grinder to correct the shape of the bent pipe parts according to the measurement results. The shape and right angle accuracy is <0.005mm.
[0049] 7. Use a φ6R0.5 (6mm diameter, R0.5 at the root) milling cutter and R2, R1 (4mm and 2mm diameters respectively) ball cutters to finish the two sides of the bent pipe part 20 using a CNC machine with an accuracy of <0.01mm.
[0050] 8. Remove the auxiliary ribs 12 and auxiliary frame 13 by wire cutting (such as Figure 2 shown).
[0051] 9. Use EDM to process VDI18 surface with auxiliary surface 11 as reference surface, with accuracy less than 0.01mm, and then use CNC to process the smooth surface.
[0052] 10. After EDM processing is completed, the auxiliary surface 11 is removed by wire cutting and trimming without a wire head. A precision elbow part 20 with an accuracy of 0.01 mm is obtained (as shown in 3).
[0053] The structure of the auxiliary body in this application is designed based on comprehensive considerations such as processing benchmarks, strength during processing, and deformation caused by the release of internal stress. The auxiliary body shape processing scheme can be used for various types of bent pipe parts.
[0054] The auxiliary body and the bent pipe part are made of the same material and are integrally formed. The auxiliary body is removed after processing. The processing scheme of the present invention can be used for processing any bent pipe part with this feature.
[0055] The processing method of the bent pipe parts of the present application reduces the degree of deformation during processing by rationally selecting materials; adds auxiliary bodies when designing parts to effectively reduce the processing difficulty; adopts different processes during the processing to eliminate internal stress; and overcomes the problem of deformation in the previous processing of similar parts of this type through the rational arrangement of processes, and significantly improves the processing accuracy.
[0056] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should be included within the scope of the claims of the present application.
Claims
1. A method for processing a bent pipe part, characterized in that: The following steps are involved: Cut the material according to the preset size to obtain the processed blank; CNC processing is performed on the blank according to the designed auxiliary body to obtain an auxiliary body connected with the bent pipe part, wherein the auxiliary body includes an auxiliary surface, auxiliary ribs and an auxiliary frame; Removing the auxiliary ribs and the auxiliary frame by wire cutting; The textured surface is processed by using EDM with the auxiliary surface as the reference surface, and then the smooth surface is processed by CNC, and finally the auxiliary surface is removed by wire cutting.
2. The processing method according to claim 1, characterized in that: The auxiliary body designed according to the blank is subjected to CNC processing to obtain the auxiliary body connected with the bent pipe part, including: According to the size of the elbow part, use CNC to roughen the two sides of the blank, and reserve 0.5mm on one side of the elbow part; The blank is subjected to vacuum heat treatment and then to cryogenic treatment; Use a grinder to make a right angle, leaving 0.1mm on one side; CNC was used to roughen the two sides of the blank for the second time, leaving 0.1mm on one side, and the blank was left for 12 hours to eliminate internal stress.
3. The processing method according to claim 2, characterized in that: The hardness of the blank after the vacuum heat treatment is HRC50-52 degrees.
4. The processing method according to claim 2, characterized in that: The cryogenic treatment temperature is -196°C.
5. The processing method according to claim 1, characterized in that: The wire cutting to remove the auxiliary rib and the auxiliary frame includes: Cutting the connection between the auxiliary rib and one end of the bent pipe part by wire cutting; Heat treatment again; Use a grinder to correct the shape of the bent pipe parts with an accuracy of <0.005mm; Use CNC to finish the two sides of the elbow parts according to the size of the parts, with an accuracy of <0.01mm; The auxiliary ribs and the auxiliary frame are removed by wire cutting.
6. The processing method according to claim 1, characterized in that: The method of using EDM to process the textured surface with the auxiliary surface as the reference surface includes: using EDM to process the VDI18 textured surface with the auxiliary surface as the reference surface, with an accuracy of less than 0.01 mm.
7. The processing method according to claim 1, characterized in that: The wire cutting to remove the auxiliary surface includes: using a wire cutting method of cutting one and trimming two to remove the auxiliary surface without a wire head.
8. The processing method according to claim 1, characterized in that: Before blanking according to the preset size, the method further includes: An auxiliary body is designed according to the shape of the bent pipe part, and the auxiliary body serves as a processing reference surface for subsequent processing.
9. The processing method according to claim 1, characterized in that: The blank is Swedish S136A.
10. The processing method according to claim 1, characterized in that: The blank composition is C 0.38%, Si 0.8%, Mn 0.5%, Cr 13.6%, V < 0.03%, S < 0.03%, and Fe as the balance.