Machining treatment method for military industry cylindrical shell part

Abstract

The machining treatment method for the military industry cylindrical shell part comprises the following machining steps that S1, forming machining is conducted, specifically, appearance structure and size machining is conducted on a blank through a numerical control machine tool; s2, bench worker treatment is carried out, specifically, auxiliary treatment is carried out on the structural part subjected to rough machining through a bench worker; s3, aging treatment is conducted, specifically, aging treatment is conducted according to the material characteristics of the structural part; s4, fine machining is conducted, specifically, rolling treatment is conducted on the structural part subjected to aging treatment through a numerical control machine tool; s5, surface treatment is conducted, specifically, part surface treatment work is conducted according to the use requirements of the structural part; and S6, discharging and packaging are conducted, specifically, the machined product is packaged and discharged, and all machining work is completed. Compared with a traditional method, the method for machining the cylindrical alloy part has the advantages that the surface of the workpiece is more compact, the roughness is greatly reduced, the corrosion resistance and the wear resistance are improved, and the service life is prolonged. Cutter interference is avoided, tolerance and cylindricity errors are stably controlled, precision stability is improved, and the rejection rate is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of military cylindrical parts and relates to a processing method for military cylindrical shell parts. Background Art

[0002] Cylindrical alloy parts are widely used in military industry and high-end manufacturing, but traditional processing technology has many shortcomings. Cutting processing can easily cause knife marks and chip residue on the surface of parts, resulting in large surface roughness, affecting the corrosion resistance and wear resistance of parts; tool wear and cutting force fluctuations make it difficult to stably control dimensional accuracy, resulting in a high scrap rate; processing efficiency is limited by tool replacement and sharpening, and the cost remains high; and it is impossible to effectively improve the surface material properties of parts. Therefore, it is crucial to develop new processing technology to overcome these defects. Summary of the invention

[0003] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0004] A method for processing military cylindrical shell parts, using alloy as blank material; including the following processing steps:

[0005] S1: Forming processing, using CNC machine tools to process the shape structure and size of the blank, removing most of the excess, so that the blank is processed into a cylindrical structure;

[0006] S2: Fitter processing, the fitter performs auxiliary processing on the structural parts after rough processing;

[0007] S3: Aging treatment, aging treatment is carried out according to the material properties of the structural parts;

[0008] S4: Fine processing, using CNC machine tools to roll the structural parts after aging treatment, replacing traditional cutting processing to achieve fine processing of cylindrical structural parts;

[0009] S5: Surface treatment: surface treatment of parts according to the use requirements of structural parts;

[0010] S6: Discharging and Packaging: Packing and discharging the processed products to complete all processing work.

[0011] As a further solution of the present invention: in step S4: fine processing, rolling treatment is carried out using a roller tool with a surface hardness of not less than 62HRC and a roughness of Ra0.2-Ra0.4μm, and the roller material is adapted to the cylindrical material; the roller feed speed is 6-8mm / s, and the rolling force is 600-800N.

[0012] As a further solution of the present invention: in step S3: aging treatment, the aging treatment is a heat treatment process, which specifically includes the following steps:

[0013] S3.1: Solution quenching: The part is heated and held for a certain period of time; then the part is quickly immersed in water for quenching.

[0014] S3.2: Cold deformation treatment: After solution quenching, the parts are subjected to cold deformation processing;

[0015] S3.3: Artificial aging treatment: The parts after cold deformation treatment are placed in a heat treatment furnace and artificially aged for 8 hours in a high temperature environment.

[0016] As a further solution of the present invention: in step S5: surface treatment, the surface treatment includes: anodizing treatment and conductive oxidation treatment.

[0017] As a further solution of the present invention: before step S5: surface treatment, cleaning treatment is required.

[0018] As a further solution of the present invention: S4: fine processing and S5: surface treatment processing, both need to carry out corresponding inspection processing steps.

[0019] Beneficial effects of the invention: Compared with the traditional method, the cylindrical alloy parts processing method of the invention adopts the finishing method of rolling treatment, which makes the workpiece surface more dense, greatly reduces the roughness, improves the corrosion resistance and wear resistance, and prolongs the service life. It avoids tool interference, stably controls tolerance and cylindrical error, improves precision stability, and reduces the scrap rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of a workpiece processed by the present invention. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. It should be understood that the present application is not limited to the example embodiments disclosed herein. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0022] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0023] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0024] In the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] See also Figure 1 In the embodiment of the present invention, a method for processing a military cylindrical shell part is provided, wherein an alloy is selected as a blank material, and is used for a military cylindrical alloy part (such as Figure 1 The forming process comprises the following steps:

[0026] Forming processing (S1), using CNC machine tools to accurately remove most of the excess of the blank to shape the basic shape of the cylindrical structure;

[0027] Bench processing (S2), removing burrs, rounding corners and trimming shapes;

[0028] Aging treatment (S3) optimizes the internal structure of the material;

[0029] Rolling treatment (S4) achieves fine processing;

[0030] Surface treatment (S5) meets usage requirements;

[0031] Finally, the material is unloaded and packaged (S6) to complete the processing.

[0032] Specifically: Forming processing (S1): According to the design size and precision requirements of the parts, the tool path, cutting speed, feed rate and cutting depth and other parameters are accurately planned in the CNC machine tool programming. For common high-strength aluminum alloy billets, the cutting speed is set to 80-120m / min, the feed rate is 0.15-0.25mm / r, and the cutting depth is 1.5-2.5mm, ensuring efficient removal of the allowance while reserving 0.5-1mm for subsequent processing, forming a cylindrical structural part with a dimensional accuracy within ±0.1mm and a cylindrical error less than 0.05mm, laying the foundation for subsequent processing.

[0033] Bench processing (S2): Bench processing uses fine files or sandpaper to carefully polish and thoroughly remove surface burrs; ensure smooth transition and regular shape of the surface to meet the subsequent processing benchmark requirements and improve the appearance quality and safety of parts.

[0034] Aging treatment (S3):

[0035] Solution quenching (S3.1): Determine the heating temperature and time according to the alloy composition and performance characteristics. For example, aluminum alloy 7075 is heated to 460-480℃ and kept warm for 30-60 minutes to fully dissolve the alloy elements to form a supersaturated solid solution. Then it is quickly immersed in circulating water at 20-30℃ for quenching. The cooling rate is greater than 200℃ / s to fix the distribution of alloy elements and improve the strength and plasticity of the part matrix.

[0036] Cold deformation treatment (S3.2): After solution quenching, cold rolling, cold drawing or cold extrusion are used to perform 1%-3% cold deformation processing. For example, during cold rolling, the roller pressure is controlled at 200-400MPa to optimize the internal crystal structure of the material, redistribute the residual stress, effectively reduce the residual stress level by 40%-60%, and enhance dimensional stability and anti-deformation ability.

[0037] Artificial aging treatment (S3.3): The parts after cold deformation are placed in a heat treatment furnace and kept at 120-150°C for 8 hours for artificial aging. In this process, the supersaturated solid solution precipitates a dispersion strengthening phase, such as η' phase and η phase in aluminum alloy, which significantly improves the strength of the parts (tensile strength increased by 20%-30%), hardness (hardness increased by 10%-20%), and improves toughness and fatigue resistance, ensuring long-term reliable service.

[0038] Fine processing (S4): In the fine processing of CNC machine tools, rolling treatment is used instead of cutting. The rolling equipment is equipped with a roller tool with a surface hardness of not less than 62HRC and a roughness of Ra0.2-Ra0.4μm. The material is selected according to the material of the cylinder (such as high-chromium alloy steel rollers for processing steel and carbide rollers for processing aluminum alloys). During rolling, the roller feed speed is 6-8mm / s, the rolling force is 600-800N, and it is fine-tuned according to the diameter and precision requirements of the cylinder. For example, when processing a 25mm diameter cylinder, the rolling force is set to 700N; when the diameter is 35mm, the rolling force is adjusted to 750N, achieving high-precision processing with a diameter tolerance of ±0.005mm and a cylindricality error of no more than 0.003mm. At the same time, the surface roughness reaches Ra0.2-Ra0.4μm, greatly improving the surface quality and dimensional accuracy.

[0039] Surface treatment (S5):

[0040] Anodizing treatment: Use anodizing equipment, sulfuric acid solution as electrolyte, control the oxidation voltage at 15-20V, temperature at 20-25℃, and time for 30-40 minutes to generate an oxide film with a thickness of 5-10μm on the surface of the parts, with a hardness of 300-500HV, which significantly enhances the corrosion resistance, wear resistance and insulation of the parts.

[0041] Conductive oxidation treatment: Use chromate or phosphate solution for conductive oxidation, control the temperature at 50-60℃ and the time for 10-15 minutes, and form a conductive oxide film with a thickness of 0.5-2μm on the surface of the part, reduce the surface contact resistance, improve conductivity while maintaining a certain corrosion resistance, and meet the special electrical performance requirements of the parts.

[0042] Outgoing packaging (S6): Use packaging materials with good anti-static, moisture-proof and cushioning properties.

[0043] In actual production, first select the appropriate alloy billet according to the part design drawings and material properties, and process it on the CNC machine tool according to the above-mentioned forming processing parameters. After processing, it is carefully processed by the fitter and then sent to the heat treatment furnace for aging treatment. The process parameters and operating specifications are strictly controlled in each link. After the aging treatment is completed and qualified, the rolling equipment is installed and debugged on the high-precision CNC machine tool. The rolling parameters are set according to the part size and precision requirements and trial processing is carried out. According to the trial processing results, the parameters are fine-tuned until the precision standards are met. Surface treatment is carried out after rolling. Make sure the parts are clean before processing, and monitor the equipment operation and process parameters during the processing. After the final product passes the inspection, it is packaged and shipped according to the packaging requirements. Quality records and traceability are kept throughout the process to ensure stable and reliable product quality, and continuously optimize the processing technology and parameters to improve production efficiency and product quality.

[0044] The processing method of the present invention effectively overcomes the defects of traditional processes, significantly improves the processing quality, efficiency and comprehensive performance of cylindrical alloy parts, provides key technical support for high-end manufacturing industries such as military industry, aerospace, etc., and has important industrial application value and broad market prospects.

[0045] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "including a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0046] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for processing military cylindrical shell parts, characterized in that: Select alloy as blank material; The processing steps include: S1: Forming processing, using CNC machine tools to process the shape structure and size of the blank, removing most of the excess, so that the blank is processed into a cylindrical structure; S2: Fitter processing, the fitter performs auxiliary processing on the structural parts after rough processing; S3: Aging treatment, aging treatment is carried out according to the material properties of the structural parts; S4: Fine processing, using CNC machine tools to roll the structural parts after aging treatment, replacing traditional cutting processing to achieve fine processing of cylindrical structural parts; S5: Surface treatment: surface treatment of parts according to the use requirements of structural parts; S6: Discharging and Packaging: Packing and discharging the processed products to complete all processing work.

2. A method for processing military cylindrical shell parts according to claim 1, characterized in that: Step S4: In fine processing, rolling treatment is carried out using a roller tool with a surface hardness of not less than 62HRC and a roughness of Ra0.2-Ra0.4μm. The roller material is adapted to the cylindrical material; the roller feed speed is 6-8mm / s, and the rolling force is 600-800N.

3. A method for processing military cylindrical shell parts according to claim 1, characterized in that: In step S3: aging treatment, the aging treatment is a heat treatment process, which specifically includes the following steps: S3.1: Solution quenching: The part is heated and held for a certain period of time; then the part is quickly immersed in water for quenching. S3.2: Cold deformation treatment: After solution quenching, the parts are subjected to cold deformation processing; S3.3: Artificial aging treatment: The parts after cold deformation treatment are placed in a heat treatment furnace and artificially aged for 8 hours in a high temperature environment.

4. A method for processing military cylindrical shell parts according to claim 1, characterized in that: In step S5: surface treatment, the surface treatment includes: anodizing treatment and conductive oxidation treatment.

5. The method for processing military cylindrical shell parts according to claim 1, characterized in that: In step S5: before the surface treatment process, a cleaning process is required.

6. A method for processing military cylindrical shell parts according to claim 1, characterized in that: After S4: fine processing and S5: surface treatment processing, corresponding inspection processing steps are required.

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