A processing method for an access panel part

Abstract

The present invention discloses a processing method for an access panel part, which includes collecting the original structural data of the access panel part and constructing a three-dimensional model of the access panel part; forging a cuboid rough blank according to the geometric dimensions of the access panel part; carrying out anti-deformation process design on the structure of the access panel part to determine the position and size of the process notch; selecting the processing tool for the process notch and the corresponding processing parameters to carry out the processing of the process notch on the access panel part; selecting the rough machining tool and the corresponding processing parameters to carry out rough machining on the front and back surfaces of the access panel part; selecting the finishing tool for the back surface and the corresponding processing parameters to carry out finishing machining on the back surface of the access panel part; selecting the finishing tool for the front surface and the corresponding processing parameters to carry out finishing machining on the front surface of the access panel part; selecting the outer contour machining tool and the corresponding processing parameters to carry out machining and forming on the outer contour of the access panel part. The present invention can achieve that the dimensional accuracy of the part meets the design requirements, and further improve the processing efficiency and quality.

Description

Technical Field

[0001] The present invention relates to the technical field of numerical control machine tools, and particularly relates to a processing method for cover parts. Background Art

[0002] With the continuous development of the aerospace field and numerical control machining technology, in order to reduce weight or meet usage requirements, parts are mostly composed of complex curved surfaces and grid cavities. Cover parts are important parts in the aerospace field. The outer shape of such cover parts is composed of complex curved surfaces, with a grid cavity in the middle. The thickness of the thin area of the part is small. During the processing process, it is difficult to clamp the part, and the part is prone to deformation after processing. The processing difficulty is large, and its dimensional accuracy is difficult to meet the design and assembly requirements. It is difficult to guarantee the processing efficiency and quality of the part.

[0003] At the present stage, during the processing and manufacturing of such parts, a numerical control machining center is used to complete the roughing and finishing of the front and back sides of the cover part, and then the outer contour of the part is milled into shape. When processing the part by this method, since the back of the part is an arc surface and the part is thin, after milling the outer contour, stress is released and the part will deform, unable to meet the design size and assembly accuracy requirements. Summary of the Invention

[0004] Aiming at the problem that the existing cover parts are difficult to clamp during the processing process and are prone to deformation after processing due to their outer shape being composed of complex curved surfaces, the present invention provides a processing method for cover parts, aiming to analyze the structure of the cover parts, adopt a process method for controlling deformation, and design a special conformal tooling, which can effectively solve the problems of difficult clamping and processing deformation of such cover parts, realize that the dimensional accuracy of the parts meets the design requirements, and further improve the processing efficiency and quality.

[0005] In order to achieve the above invention purpose, the technical solution adopted by the present invention is as follows:

[0006] A processing method for cover parts, comprising the following steps:

[0007] S1. Collect the original structure data of the cover part and construct a three-dimensional model of the cover part;

[0008] S2. Forge a cuboid rough blank according to the geometric dimensions of the cover part;

[0009] S3. Conduct anti-deformation process design on the structure of the cover part to determine the position and size of the process notch;

[0010] S4. Select the processing tool for the process notch and the corresponding processing parameters, and adopt a contour milling processing strategy to process the process notch of the cover part;

[0011] S5. Select the roughing tool and the corresponding processing parameters, and adopt a volume block roughing strategy to rough the front and back sides of the cover part;

[0012] S6. Select the back finishing tool and the corresponding machining parameters, and adopt the surface milling strategy to finish machine the back of the cover part;

[0013] S7. Select the front finishing tool and the corresponding machining parameters, and adopt multiple strategies to finish machine the front of the cover part;

[0014] S8. Select the outer contour machining tool and the corresponding machining parameters, and adopt the cutting line strategy to machine and form the outer contour of the cover part.

[0015] Optionally, step S4 is specifically:

[0016] Select the process notch machining tool with parameters of Φ20R0.8, the cutting feed is 2000 mm / min, the step depth is 0.5 mm, and adopt the contour milling machining strategy for down milling to complete the machining of the process notch of the cover part.

[0017] Optionally, step S5 is specifically:

[0018] Select the rough machining tool with parameters of Φ20R0.8, the cutting feed is 2000 mm / min, the step depth is 0.5 mm, the span is 14 mm, adopt the volume block rough machining strategy, and perform down milling along the inclined direction. The scanning type is thread type, complete the rough machining of the front and back of the cover part, and leave a 2-mm allowance.

[0019] Optionally, step S5 further includes:

[0020] After the rough machining is completed, heat the cover part to a temperature of 180°C - 210°C, keep it warm for 1 hour, then take it out of the furnace and cool it in the air, so as to achieve the effect of reducing the stress in the cover part.

[0021] Optionally, step S6 specifically includes:

[0022] S61. Select the first back finishing tool and the corresponding machining parameters, and adopt the surface milling strategy to perform the first finishing on the back of the cover part;

[0023] S62. Select the second back finishing tool and the corresponding machining parameters, and adopt the surface milling strategy to perform the second finishing on the back of the cover part.

[0024] Optionally, step S6 is specifically:

[0025] Select the first back finishing tool with parameters of Φ10R1, the cutting feed is 2200 mm / min, the span is 2 mm, adopt the surface milling strategy, complete the first finishing of the back of the cover part, and leave a 1-mm allowance;

[0026] Select the second finishing tool for the back side with a parameter of Φ10R5, with a cutting feed of 2200 mm / min, a span of 0.3 mm, and adopt a surface milling strategy to complete the second finishing of the back side of the cover part.

[0027] Optionally, step S7 specifically includes:

[0028] S71. Select the first finishing tool for the middle cavity on the front side and the corresponding machining parameters, and adopt a volume block machining strategy to perform the first finishing on the middle cavity on the front side of the cover part;

[0029] S72. Select the first finishing tool for the bottom surface of the outer arc on the front side and the corresponding machining parameters, and adopt a cutting line strategy to perform the first finishing on the bottom surface of the outer arc on the front side of the cover part;

[0030] S73. Select the first finishing tool for the top arc surface on the front side and the corresponding machining parameters, and adopt a cutting line strategy to perform the first finishing on the top arc surface on the front side of the cover part;

[0031] S74. Select the second finishing tool for the top arc surface on the front side and the corresponding machining parameters, and adopt a cutting line strategy to perform the second finishing on the top arc surface on the front side of the cover part;

[0032] S75. Select the second finishing tool for the middle cavity on the front side and the corresponding machining parameters, and adopt a custom trajectory milling strategy to perform the second finishing on the side wall of the middle cavity on the front side of the cover part;

[0033] S76. Select the third finishing tool for the middle cavity on the front side and the corresponding machining parameters, and adopt a surface milling strategy to perform the second finishing on the bottom surface of the middle cavity on the front side of the cover part;

[0034] S77. Select the second finishing tool for the bottom surface of the outer arc on the front side and the corresponding machining parameters, and adopt a cutting line strategy to perform the second finishing on the bottom surface of the outer arc on the front side of the cover part.

[0035] Optionally, step S7 is specifically:

[0036] Select the first finishing tool for the middle cavity on the front side with a parameter of Φ10R1, with a cutting feed of 2200 mm / min, a step depth of 0.5 mm, a span of 4 mm, adopt a volume block machining strategy, perform down milling along the inclined direction, the scanning type is spiral to maintain the cutting type, complete the first finishing of the middle cavity on the front side of the cover part, and leave a 1 mm allowance;

[0037] Select the first finishing tool for the bottom surface of the outer arc on the front side with a parameter of Φ10R1, with a cutting feed of 2200 mm / min and a tool mark height of 0.006 mm, adopt a cutting line strategy, complete the first finishing of the bottom surface of the outer arc on the front side of the cover part, and leave a 1 mm allowance;

[0038] Select the first finishing tool for the front top arc surface with parameters of Φ10R1, the cutting feed is 2200 mm / min, the tool mark height is 0.006 mm, adopt the cutting line strategy, complete the first finishing of the front top arc surface of the cover part, and leave a 1 mm allowance;

[0039] Select the second finishing tool for the front top arc surface with parameters of Φ10R5, the cutting feed is 2200 mm / min, the tool mark height is 0.006 mm, adopt the cutting line strategy, complete the second finishing of the front top arc surface of the cover part;

[0040] Select the second finishing tool for the front middle cavity with parameters of Φ10R5, the cutting feed is 2200 mm / min, the step depth is 0.5 mm, adopt the custom trajectory milling strategy for down milling, complete the second finishing of the side wall of the front middle cavity of the cover part;

[0041] Select the third finishing tool for the front middle cavity with parameters of Φ10R5, the cutting feed is 2200 mm / min, the span is 0.3 mm, adopt the surface milling strategy, complete the second finishing of the bottom surface of the front middle cavity of the cover part;

[0042] Select the second finishing tool for the front outer arc bottom surface with parameters of Φ10R5, the cutting feed is 2200 mm / min, the tool mark height is 0.006 mm, adopt the cutting line strategy, complete the second finishing of the front outer arc bottom surface of the cover part.

[0043] Optionally, step S7 further includes:

[0044] Clamp the cover part on the special conformal fixture through bolts, machining general pressure plates and pads. When clamping the cover part, gently tap the cover part with a wooden hammer to make its interior fully fit the conformal fixture, then verify the clamping accuracy by dial indicator alignment until it meets the requirements, and finally tighten the cover part through bolts, machining general pressure plates and pads.

[0045] Optionally, step S8 is specifically:

[0046] Select the outer contour machining tool with parameters of Φ10, the cutting feed is 2200 mm / min, the tool mark height is 0.006 mm, adopt the cutting line strategy, mill the outer contour of the cover part, and machine it into shape.

[0047] The present invention has the following beneficial effects:

[0048] (1) A method for processing a cover part provided by the present invention, by which the cover part is processed. During digital milling, a process method for controlling deformation is adopted to reduce processing stress, control part deformation, reasonably select cutting tools, optimize the milling program strategy, and preferably complete the processing of the part, ensuring that the dimensional accuracy of the part meets the design and assembly requirements, ensuring the processing quality, and improving the processing efficiency.

[0049] (2) The present invention designs a conformal clamping fixture for the cover part, which can quickly realize the positioning and clamping of the cover part, solve the problem of difficult clamping, and reduce the clamping time. The cover part can fit well on the fixture, which can reduce the vibration and deformation of the part during processing and ensure the dimensional accuracy of the part. Description of the Drawings

[0050] Figure 1 It is a schematic structural diagram of the cover part.

[0051] Figure 2 It is a schematic flow diagram of a method for processing a cover part;

[0052] Figure 3 It is a schematic diagram of the process notch of the cover part;

[0053] Figure 4 It is a schematic structural diagram of the cover conformal fixture;

[0054] Figure 5 It is a schematic diagram of the clamping of the part in the embodiment. Detailed Embodiments

[0055] The following describes the detailed embodiments of the present invention for the convenience of those skilled in the art of the present technology to understand the present invention. However, it should be clear that the present invention is not limited to the scope of the detailed embodiments. For those of ordinary skill in the art of the present technology, as long as various changes are within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions and creations using the concept of the present invention are within the scope of protection.

[0056] As Figure 1 shown is a schematic structural diagram of the cover part to be processed in this embodiment. The length, width, and thickness dimensions of the cover part are: 417 mm × 320 mm × 28.5 mm. There is a grid cavity in the middle of the cover. The rib width is 5 mm. The thickness of the thin area at the outer edge and the grid cavity part of the cover part is 4 mm. The back of the cover is a large arc surface. The material of the cover part is 2A14, an aluminum forging. The outer shape of the cover part is composed of complex curved surfaces, with a grid cavity in the middle. The thickness of the thin area of the part is small. During processing, it is difficult to clamp the part, and the part is prone to deformation after processing. The processing difficulty is large, and its dimensional accuracy is difficult to meet the design and assembly requirements. It is difficult to ensure the processing efficiency and quality of the part.

[0057] To solve the above problems, this embodiment provides a method for machining an access panel part, as Figure 2 shown, including the following steps S1 to S8:

[0058] S1. Collect the original structural data of the access panel part and construct a three-dimensional model of the access panel part;

[0059] In an alternative embodiment of the present invention, in this embodiment, according to the specific structure of the required access panel, the original geometric data is collected, and then a three-dimensional model of the access panel part is established using the three-dimensional modeling software CREO4.0.

[0060] S2. Forge a cuboid rough blank according to the geometric dimensions of the access panel part;

[0061] In an alternative embodiment of the present invention, in this embodiment, according to the geometric dimensions of the part, a cuboid rough blank is forged by forging. The dimensions of the cuboid rough blank are 500mm×410mm×40mm.

[0062] S3. Conduct anti-deformation process design for the structure of the access panel part and determine the position and size of the process notch;

[0063] In an alternative embodiment of the present invention, in this embodiment, through the analysis of the structure of the access panel part, anti-deformation process design is carried out to determine the position and size of the process notch. There are a total of 4 notches, and the notch size is 130.5mm×42.5mm, as Figure 3 shown.

[0064] S4. Select the machining tool for the process notch and the corresponding machining parameters, and use the contour milling machining strategy to machine the process notch of the access panel part;

[0065] In an alternative embodiment of the present invention, in this embodiment, a numerical control machining center is used. A machining tool for the process notch with parameters of Φ20R0.8 is selected, the cutting feed is 2000mm / min, the step depth is 0.5mm, and the contour milling machining strategy is used for down milling. The machining of the process notch of the access panel part is completed.

[0066] S5. Select the rough machining tool and the corresponding machining parameters, and use the volume block rough machining strategy to rough machine the front and back of the access panel part;

[0067] In an alternative embodiment of the present invention, in this embodiment, a numerical control machining center is used. A rough machining tool with parameters of Φ20R0.8 is selected, the cutting feed is 2000mm / min, the step depth is 0.5mm, the span is 14mm, and the volume block rough machining strategy is used to perform down milling along the inclined direction. The scanning type is thread type. The rough machining of the front and back of the access panel part is completed, and a 2mm allowance is left.

[0068] After rough machining is completed, the access panel part is heated to a temperature of 180°C - 210°C, kept warm for 1 hour, and then taken out of the furnace and cooled in the air, so as to achieve the effect of reducing the stress in the access panel part.

[0069] S6. Select the back finishing tool and the corresponding machining parameters, and use the surface milling strategy to finish machine the back of the access panel part;

[0070] In an alternative embodiment of the present invention, step S6 specifically includes:

[0071] S61. Select the first back finishing tool and the corresponding machining parameters, and use the surface milling strategy to perform the first finishing machining on the back of the access panel part;

[0072] S62. Select the second back finishing tool and the corresponding machining parameters, and use the surface milling strategy to perform the second finishing machining on the back of the access panel part.

[0073] Specifically, in this embodiment, a CNC machining center is used. First, select the first back finishing tool with a parameter of Φ10R1, the cutting feed is 2200 mm / min, the span is 2 mm, and use the surface milling strategy to complete the first finishing machining of the back of the access panel part, leaving a 1 mm allowance;

[0074] Then select the second back finishing tool with a parameter of Φ10R5, the cutting feed is 2200 mm / min, the span is 0.3 mm, and use the surface milling strategy to complete the second finishing machining of the back of the access panel part.

[0075] S7. Select the front finishing tool and the corresponding machining parameters, and use multiple strategies to finish machine the front of the access panel part;

[0076] In an alternative embodiment of the present invention, in this embodiment, the access panel part is clamped on a special contoured fixture through bolts, general machining clamping plates and pads. When clamping the access panel part, gently tap the access panel part with a wooden hammer to make its interior fully fit the contoured fixture, and then verify the clamping accuracy by dial indicator alignment until the requirements are met. Finally, tighten the access panel part through bolts, general machining clamping plates and pads. As Figure 4 and Figure 5 shown, Figure 4 is a schematic diagram of the structure of the access panel contoured fixture, Figure 5 is a schematic diagram of the clamping of the part in the embodiment, where label 1 is the access panel workpiece to be machined, label 2 is the contoured fixture, label 3 is the bolt assembly, label 4 is the clamping plate, and label 5 is the process pressing table.

[0077] Step S7 specifically includes:

[0078] S71. Select the first finishing tool for the middle cavity on the front side and the corresponding machining parameters, and perform the first finishing on the middle cavity on the front side of the fairing part using the volume block machining strategy;

[0079] S72. Select the first finishing tool for the bottom surface of the outer arc on the front side and the corresponding machining parameters, and perform the first finishing on the bottom surface of the outer arc on the front side of the fairing part using the cutting line strategy;

[0080] S73. Select the first finishing tool for the top arc surface on the front side and the corresponding machining parameters, and perform the first finishing on the top arc surface on the front side of the fairing part using the cutting line strategy;

[0081] S74. Select the second finishing tool for the top arc surface on the front side and the corresponding machining parameters, and perform the second finishing on the top arc surface on the front side of the fairing part using the cutting line strategy;

[0082] S75. Select the second finishing tool for the middle cavity on the front side and the corresponding machining parameters, and perform the second finishing on the side wall of the middle cavity on the front side of the fairing part using the custom trajectory milling strategy;

[0083] S76. Select the third finishing tool for the middle cavity on the front side and the corresponding machining parameters, and perform the second finishing on the bottom surface of the middle cavity on the front side of the fairing part using the surface milling strategy;

[0084] S77. Select the second finishing tool for the bottom surface of the outer arc on the front side and the corresponding machining parameters, and perform the second finishing on the bottom surface of the outer arc on the front side of the fairing part using the cutting line strategy.

[0085] Specifically, in this embodiment, a CNC machining center is used. First, select the first finishing tool for the middle cavity on the front side with a parameter of Φ10R1, the cutting feed is 2200 mm / min, the step depth is 0.5 mm, the span is 4 mm, adopt the volume block machining strategy, perform down milling along the inclined direction, the scanning type is spiral to maintain the cutting type, complete the first finishing of the middle cavity on the front side of the fairing part, and leave a 1 mm allowance;

[0086] Then select the first finishing tool for the bottom surface of the outer arc on the front side with a parameter of Φ10R1, the cutting feed is 2200 mm / min, the tool mark height is 0.006 mm, adopt the cutting line strategy, complete the first finishing of the bottom surface of the outer arc on the front side of the fairing part, and leave a 1 mm allowance;

[0087] Then select the first finishing tool for the top arc surface on the front side with a parameter of Φ10R1, the cutting feed is 2200 mm / min, the tool mark height is 0.006 mm, adopt the cutting line strategy, complete the first finishing of the top arc surface on the front side of the fairing part, and leave a 1 mm allowance;

[0088] Then select the second finishing tool for the front top arc surface with parameters of Φ10R5, with a cutting feed of 2200 mm / min, a tool mark height of 0.006 mm, and adopt the cutting line strategy to complete the second finishing of the front top arc surface of the cover part;

[0089] Then select the second finishing tool for the front middle cavity with parameters of Φ10R5, with a cutting feed of 2200 mm / min and a step depth of 0.5 mm, and perform down milling using the custom trajectory milling strategy to complete the second finishing of the side wall of the front middle cavity of the cover part;

[0090] Then select the third finishing tool for the front middle cavity with parameters of Φ10R5, with a cutting feed of 2200 mm / min and a span of 0.3 mm, and adopt the surface milling strategy to complete the second finishing of the bottom surface of the front middle cavity of the cover part.

[0091] Finally, select the second finishing tool for the front outer arc bottom surface with parameters of Φ10R5, with a cutting feed of 2200 mm / min and a tool mark height of 0.006 mm, and adopt the cutting line strategy to complete the second finishing of the front outer arc bottom surface of the cover part.

[0092] S8. Select the outer contour machining tool and corresponding machining parameters, and adopt the cutting line strategy to machine and form the outer contour of the cover part.

[0093] In an alternative embodiment of the present invention, a CNC machining center is used in this embodiment. Select the outer contour machining tool with parameters of Φ10, with a cutting feed of 2200 mm / min and a tool mark height of 0.006 mm, and adopt the cutting line strategy to mill the outer contour of the cover part for machining and forming.

[0094] In summary, by machining the cover part using the method of this embodiment, during numerical control milling, the machining stress is reduced, the part deformation is controlled, the tools are reasonably selected, the rough milling program strategy is optimized, the machining of the part is preferably completed, the dimensional accuracy of the part is ensured to meet the design and assembly requirements, the machining quality is ensured, and the machining efficiency is improved.

[0095] The present invention is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, and the combination of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices generate for implementing in the process Figure 1 one process or multiple processes and / or blocks Figure 1a device for the functions specified in one or more boxes

[0096] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory produce a manufactured article including an instruction device that implements the functions specified in one Figure 1 one or more processes and / or boxes Figure 1 a box or more boxes

[0097] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are executed on the computer or other programmable device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one Figure 1 one or more processes and / or boxes Figure 1 a box or more boxes

[0098] In the present invention, specific embodiments are used to elaborate on the principles and implementation manners of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present invention.

[0099] Those of ordinary skill in the art will realize that the embodiments described herein are for helping the reader understand the principles of the present invention, and it should be understood that the protection scope of the present invention is not limited to such specific statements and embodiments. Those of ordinary skill in the art can make various other specific deformations and combinations that do not depart from the essence of the present invention based on the technical revelations disclosed in the present invention, and these deformations and combinations are still within the protection scope of the present invention.

Claims

1. A method for machining a cover part, characterized in that, It includes the following steps: S1. Collect the original structural data of the access cover part and construct a three-dimensional model of the access cover part; S2. Forge a cuboid rough blank according to the geometric dimensions of the access cover part; S3. Conduct anti-deformation process design for the structure of the access cover part to determine the position and size of the process notch; S4. Select the cutting tool for the process notch and the corresponding machining parameters, and adopt the contour milling machining strategy to machine the process notch of the access cover part; S5. Select the roughing tool and the corresponding machining parameters, and adopt the volume block roughing strategy to rough the front and back of the access cover part; S6. Select the finishing tool for the back and the corresponding machining parameters, and adopt the surface milling strategy to finish the back of the access cover part; S7. Select the finishing tool for the front and the corresponding machining parameters, and adopt multiple strategies to finish the front of the access cover part; S8. Select the cutting tool for the outer contour and the corresponding machining parameters, and adopt the cutting line strategy to machine and form the outer contour of the access cover part; Step S7 is specifically as follows: Select the first finishing tool for the middle cavity on the front with the parameter of Φ10R1, the cutting feed is 2200 mm / min, the step depth is 0.5 mm, the span is 4 mm, adopt the volume block machining strategy, perform down milling along the slope, the scanning type is spiral to maintain the cutting type, complete the first finishing of the middle cavity on the front of the access cover part, and leave a 1-mm allowance; Select the first finishing tool for the bottom surface of the outer arc on the front with the parameter of Φ10R1, the cutting feed is 2200 mm / min, the tool mark height is 0.006 mm, adopt the cutting line strategy, complete the first finishing of the bottom surface of the outer arc on the front of the access cover part, and leave a 1-mm allowance; Select the first finishing tool for the top arc surface on the front with the parameter of Φ10R1, the cutting feed is 2200 mm / min, the tool mark height is 0.006 mm, adopt the cutting line strategy, complete the first finishing of the top arc surface on the front of the access cover part, and leave a 1-mm allowance; Select the second finishing tool for the top arc surface on the front with the parameter of Φ10R5, the cutting feed is 2200 mm / min, the tool mark height is 0.006 mm, adopt the cutting line strategy, complete the second finishing of the top arc surface on the front of the access cover part; Select the second finishing tool for the side wall of the middle cavity on the front with the parameter of Φ10R5, the cutting feed is 2200 mm / min, the step depth is 0.5 mm, adopt the custom trajectory milling strategy to perform down milling, complete the second finishing of the side wall of the middle cavity on the front of the access cover part; Select the third finishing tool for the bottom surface of the middle cavity on the front with the parameter of Φ10R5, the cutting feed is 2200 mm / min, the span is 0.3 mm, adopt the surface milling strategy, complete the second finishing of the bottom surface of the middle cavity on the front of the access cover part; Select the second finishing tool for the bottom surface of the outer arc on the front with the parameter of Φ10R5, the cutting feed is 2200 mm / min, the tool mark height is 0.006 mm, adopt the cutting line strategy, complete the second finishing of the bottom surface of the outer arc on the front of the access cover part.

2. The processing method of an access panel part according to claim 1, characterized in that Step S4 is specifically as follows: Select a machining tool for the process notch with parameters of Φ20R0.8, a cutting feed of 2000 mm / min, a step depth of 0.5 mm, and perform down milling using the contour milling machining strategy to complete the machining of the process notch of the cover part.

3. A method for machining a hatch part according to claim 1, characterized in that, Step S5 is specifically as follows: Select a roughing tool with parameters of Φ20R0.8, a cutting feed of 2000 mm / min, a step depth of 0.5 mm, a span of 14 mm, adopt the volume block roughing strategy, perform down milling along the inclined direction, with the scan type being thread type, complete the roughing of the front and back of the cover part, and leave a 2-mm allowance.

4. A method for machining a hatch part according to claim 1, characterized in that, Step S5 also includes: After completing rough machining, heat the cover part to a temperature of 180°C - 210°C, keep it warm for 1 hour, then take it out of the furnace and cool it in the air.

5. A method for machining a cover part according to claim 1, characterized in that, Step S6 specifically includes: S61. Select the first finishing tool for the back and the corresponding machining parameters, and perform the first finishing of the back of the cover part using the surface milling strategy; S62. Select the second finishing tool for the back and the corresponding machining parameters, and perform the second finishing of the back of the cover part using the surface milling strategy.

6. The processing method of an access panel part according to claim 5, wherein Step S6 is specifically as follows: Select the first finishing tool for the back with parameters of Φ10R1, a cutting feed of 2200 mm / min, a span of 2 mm, adopt the surface milling strategy, complete the first finishing of the back of the cover part, and leave a 1-mm allowance; Select the second finishing tool for the back with parameters of Φ10R5, a cutting feed of 2200 mm / min, a span of 0.3 mm, adopt the surface milling strategy, and complete the second finishing of the back of the cover part.

7. A method for machining a hatch part according to claim 1, characterized in that, Step S7 also includes: Clamp the cover part on the special conformal fixture through bolts, general machining clamping plates, and pads. When clamping the cover part, gently tap the cover part with a wooden hammer to make its interior fully fit the conformal fixture, then verify the clamping accuracy by dial indicator alignment until it meets the requirements, and finally tighten the cover part through bolts, general machining clamping plates, and pads.

8. A method for machining a hatch part according to claim 1, characterized in that, Step S8 is specifically as follows: Select an outer contour machining tool with parameters of Φ10, a cutting feed of 2200 mm / min, a tool mark height of 0.006 mm, adopt the cutting line strategy, and mill the outer contour of the cover part to complete the machining.

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