A production process for an integrated chassis

Abstract

The present invention discloses a production process method for an integral chassis, comprising: rough and fine machining of the chassis outer surface, rough machining of the chassis inner cavity, wire cutting of the chassis inner cavity, electric spark machining of the chassis inner cavity, fine machining of the chassis inner cavity, bench work on the chassis inner surface, conductive oxidation of the chassis, painting of the chassis and chassis assembly and molding; the method can better ensure the accuracy of the complex structural features inside the chassis than traditional mechanical machining methods, and by optimizing the production process of each process, the method can achieve a faster molding speed and higher quality surface roughness than traditional machining methods.

Description

Technical Field

[0001] The present invention relates to the technical field of integral case processing, in particular to a process method for producing an integral case. Background Art

[0002] With the rapid development of my country's aerospace industry, the structural performance of electronic equipment chassis previously constructed using assembly or welding methods no longer meets current requirements. Major research institutes are now preferring integrated machining in the early stages of electronic equipment chassis design to achieve better structural performance. However, traditional machining methods are costly and time-consuming, and some complex structural features cannot be processed, significantly increasing R&D cycles and processing difficulty. Therefore, research on machining methods for integrated aerospace electronic equipment chassis is urgent.

[0003] In addition, the integral chassis is formed by aluminum alloy processing. The interior of the chassis cannot be completed by milling alone. The inner cavity must be processed by wire cutting and electric spark machining. Due to the low melting heat and vaporization heat of aluminum alloy, when wire cutting is used for aluminum alloy cutting, a white layer will form on the surface of the aluminum alloy with poor surface roughness. For electronic chassis, the rough inner surface will scratch electronic components. The surface roughness needs to be controlled above 3.2 to reduce the internal roughness of the integral chassis. This white layer needs to be removed to achieve a qualified chassis product.

[0004] Currently, sandpaper is mainly used for pressing and polishing. This method cannot complete the polishing work of every corner inside the complex box, and this method is prone to problems such as uneven surface and collapsed edges, which will lead to the scrapping of the chassis. Summary of the Invention

[0005] In order to solve the problems in the prior art of the traditional machining method of the integral chassis being high in cost, time-consuming and easily causing the whitening layer to be scrapped, the present invention provides a production process method for the integral chassis.

[0006] The technical solution of the present invention is: a process for producing an integrated chassis, comprising the following steps:

[0007] Step 1: Rough and fine machining of the outer surface of the box. The outer surface of the box is first machined by using a milling machine to machine the outer surface of the solid aluminum material to meet the design size requirements. After the machining is completed, the outer surface has a high surface roughness.

[0008] Step 2: Rough machining of the inner cavity of the box: Use a milling machine to hollow out the solid aluminum material whose outer surface has been machined in step 1 to meet the design size requirements;

[0009] Step 3: Wire cutting of the inner cavity of the box; use wire cutting to process the right-angle corners inside the box to form the chassis board slots, with a size reserved of 0.05mm;

[0010] Step 4: EDM inside the box; use an EDM machine to process the right-angle step surface inside the box to form a board limit step with a size reserved of 0.05mm;

[0011] Step 5: Finishing the inner cavity of the box; use a milling machine to perform finishing while ensuring the internal installation dimensions, while removing part of the whitening layer left by electrical machining and improving the surface roughness of the inner wall;

[0012] Step 6: Bench work on the inner surface of the box. Bench work on the inner surface of the box uses aluminum alloy electro-processing white layer tools to perform rough and fine grinding to remove the white layer remaining from electro-processing.

[0013] Step 7: Conductive oxidation of the chassis: The entire chassis undergoes conductive oxidation to form a dense oxide layer on the chassis surface.

[0014] Step 8: Spray paint on the box body; spray paint on the outer surface of the box body;

[0015] Step 9: Assemble the chassis; assemble the finished chassis with the front and rear panels to form a complete chassis.

[0016] As a further improvement of the above technical solution:

[0017] Preferably, the roughness of the outer surface in Step 1 and the inner surface in Step 6 are both greater than or equal to 3.2.

[0018] Preferably, in Step 8, the contact position between the box body and the front and rear panels is chamfered to C0.5, and a single component painting method is adopted during painting.

[0019] Preferably, the front panel and the rear panel in Step 9 are processed by ordinary machining production methods.

[0020] Preferably, the aluminum alloy electromachining white layer tool includes a rough scraper and a fine scraper;

[0021] Preferably, the rough scraper includes a first handle, a first scraper blade body fixedly arranged on the first handle, and a first cutting head arranged on the first scraper blade body and integrally formed with the first scraper blade body, wherein the angle of the cross section of the first cutting head is 80°, and the front end of the first cutting head is an R0.4 fillet;

[0022] Preferably, the fine scraper includes a second handle, a second scraper blade body fixed on the second handle, a second blade head arranged on the second scraper blade body and integrally formed with the second scraper blade body, the angle of the cross section of the second blade head is 30°, and the front end of the first blade head is an R0.2 fillet.

[0023] Preferably, the first cutter head and the first scraper blade body, as well as the second cutter head and the second scraper blade body are offset as a whole by 1 mm.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The integrated chassis processing method provided by the present invention can better ensure the accuracy of the complex structural features inside the chassis than traditional mechanical processing methods. By optimizing the production process of each step, it can achieve faster molding speed and higher quality surface roughness than traditional processing methods. The process provided by the present invention also has the following local effects:

[0026] ① This method completes the rough machining and fine machining of the outer surface before the inner part of the box is processed, which improves the overall efficiency by about 20% and the surface roughness is above 3.2;

[0027] ② The method of the present invention performs roughing treatment before electrical machining the interior of the box, which can effectively reduce the deformation of the box and ensure that the flatness of the entire box is controlled within 0.1 / 100*100mm.

[0028] ③ In the method of the present invention, the box body and the front and rear panels are chamfered C0.5 at the contact points between each other to eliminate the paint peeling phenomenon during assembly.

[0029] 2. The present invention designs a special tool for the benchwork part of the inner surface of the box in the process method, which can effectively remove the white layer on the electro-machined surface of the aluminum alloy, and finally reveal the original color of the aluminum of the box. The surface roughness reaches 3.2, which meets the use requirements of the electronic chassis, and at the same time avoids problems such as uneven surface and collapsed edges. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic structural diagram of the rough scraper of the present invention;

[0031] Figure 2 yes Figure 1 Schematic diagram of the enlarged structure of area A;

[0032] Figure 3 It is a schematic structural diagram of the fine scraper of the present invention;

[0033] Figure 4 yes Figure 3 Schematic diagram of the enlarged structure of area B in the middle.

[0034] Figure numerals: 1, first handle; 2, first shovel blade; 3, first blade head; 4, second handle; 5, second shovel blade; 6, second blade head. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "front", "rear", "left", "right", "up", "down", etc. are based on the directions or positional relationships shown in the accompanying 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 direction, be constructed and operated in a specific direction. Therefore, it cannot be understood as a limitation on the present invention. The technical solutions of the various embodiments of the present invention can be combined, and the technical features in the embodiments can also be combined to form a new technical solution.

[0037] The present invention provides the following technical solutions:

[0038] The main structure of the integral chassis is composed of the chassis body, front panel and rear panel. The front panel and rear panel are produced by ordinary machining. The chassis structure is hollowed out from a whole piece of aluminum. The following production process is the production and molding process of the chassis: S1 Rough and fine machining of the chassis outer surface S2 Rough machining of the chassis inner cavity S3 Wire cutting of the chassis inner cavity S4 Electric spark machining of the chassis inner cavity S5 Fine machining of the chassis inner cavity S6 Bench work on the chassis inner surface S7 Conductive oxidation of the chassis S8 Painting of the chassis S9 Chassis assembly;

[0039] The specific process is described as follows:

[0040] S1: The outer surface of the box is processed first. At this time, the entire aluminum profile is solid. When the milling machine is used for rough and fine processing of the outer surface, there will be no vibration or jump of the tool. The surface roughness is high, and the overall roughness can be controlled at 3.2 or above. In addition, the cutting depth and cutting speed can be increased during processing, shortening the processing time by more than 40%;

[0041] S2: Use a milling machine to hollow out the solid aluminum material, and rough-process the interior of the box to prepare for the later wire cutting. This can shorten the processing time of wire cutting and reduce the deformation of the entire chassis.

[0042] S3: The inside of the box is processed by wire cutting to form the right-angle corners and chassis card slots, with a size reserved of 0.05mm;

[0043] S4: The inside of the box is processed by EDM machine with right-angle step surface to form the board limit step, with a size reserved of 0.05mm;

[0044] S5: Use a milling machine to perform fine processing while ensuring the internal installation dimensions, while removing part of the whitening layer left by electrical machining and improving the surface roughness of the inner wall;

[0045] S6: The inner surface of the box is cleaned by fitters to remove the whitening layer left by electrical machining, and special tools are used for rough and fine grinding to make the surface roughness reach above 3.2;

[0046] Special tools include coarse scrapers and fine scrapers;

[0047] As attached Figure 1 The figure shows a schematic diagram of a rough scraper. The first blade head 3 of the rough scraper adopts an R0.4 fillet design to ensure the rigidity of the scraper when scraping off the white layer; the first blade head 3 and the first scraper blade body 2 are offset by 1 mm as a whole. The purpose is to ensure that the blade body will not contact the inner wall of the box during operation to prevent scratches on the inner wall of the box. The offset angle of the first blade head 3 and the first scraper blade body 2 is 5°, which can extend the length of the blade head. During use, if the blade head is worn, it can be sharpened with a diamond grinding wheel and reused repeatedly; the angle of the first scraper head is 80°, which prevents chipping when the rough scraping force is too large. The first blade head 3 and the first scraper blade body 2 are integrally formed, and the first scraper blade body 2 is installed on the first handle 1.

[0048] As attached Figure 2 The figure shows a schematic diagram of a fine scraper: the second blade head 6 of the fine scraper adopts an R0.2 fillet design, and the blade head is sharper, which can ensure a higher surface roughness when removing the whitening layer; the second blade head 6 and the second scraper blade body 5 are offset by 1mm as a whole, the purpose of which is to ensure that the blade body will not contact the inner wall of the box during operation to prevent scratching the inner wall of the box. The offset angle of the second blade head 6 and the second scraper blade body 5 is 5°, which can extend the length of the blade head. During use, if the blade head is worn, it can be repeatedly sharpened with a diamond grinding wheel; the angle of the second scraper head is 30°, which can effectively increase the field of view and facilitate observation of the structural features in front of the scraper head. When performing fine scraping work, it is necessary to control the force to ensure that the final roughness of the inner cavity of the box is above 3.2. The second blade head 6 and the second scraper blade body 5 are integrally formed, and the second scraper blade body 5 is installed on the first handle 1.

[0049] The first handle 1 and the second handle 4 are processed by a CNC lathe, and the first cutter head 3, the first scraper blade 2, the second cutter head 6 and the second scraper blade 5 are all made of white steel bars and are milled by a machining center.

[0050] S7: The entire chassis undergoes conductive oxidation, forming a dense oxide layer on the surface of the chassis, which has a certain degree of corrosion resistance. In addition, it also protects the electronic chassis from electromagnetic signal interference;

[0051] S8: The outer surface of the box is spray-painted. The contact position between the box and the front and rear panels needs to be chamfered C0.5. When spraying, a single component spraying method is used. Such chamfering can eliminate the paint explosion phenomenon at the joint during assembly.

[0052] S9: The cabinet body and front and rear panels are assembled into an integral chassis.

[0053] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A method for producing an integral chassis, characterized in that: The following steps are involved: Step 1: Rough and fine machining of the outer surface of the box. The outer surface of the box is first machined by using a milling machine to machine the outer surface of the solid aluminum material to meet the design size requirements. After the machining is completed, the outer surface has a high surface roughness. Step 2: Rough machining of the inner cavity of the box: Use a milling machine to hollow out the solid aluminum material whose outer surface has been machined in step 1 to meet the design size requirements; Step 3: Wire cutting of the inner cavity of the box; use wire cutting to process the right-angle corners inside the box to form the chassis board slots, with a size reserved of 0.05mm; Step 4, EDM inside the box: Use an EDM machine to process the right-angle step surface inside the box to form a board limit step with a size reserved of 0.05mm; Step 5: Finishing the inner cavity of the box; use a milling machine to perform finishing while ensuring the internal installation dimensions, while removing part of the whitening layer left by electrical machining and improving the surface roughness of the inner wall; Step 6: Bench work on the inner surface of the box. Bench work on the inner surface of the box uses aluminum alloy electro-processing white layer tools to perform rough and fine grinding to remove the white layer remaining from electro-processing. Step 7: Conductive oxidation of the chassis: The entire chassis undergoes conductive oxidation to form a dense oxide layer on the chassis surface. Step 8: Spray paint on the box body; spray paint on the outer surface of the box body; Step 9, chassis assembly; Assemble the processed box body with the front panel and rear panel to form an integral chassis; The aluminum alloy electro-processing whitening layer tool includes a rough scraper and a fine scraper; The rough scraper comprises a first handle (1), a first scraper blade body (2) fixedly arranged on the first handle (1), and a first cutter head (3) arranged on the first scraper blade body (2) and integrally formed with the first scraper blade body (2), wherein the angle of the cross section of the first cutter head (3) is 80°, and the front end of the first cutter head (3) is an R0.4 fillet; The fine scraper comprises a second handle (4), a second scraper blade (5) fixedly arranged on the second handle (4), and a second cutter head (6) arranged on the second scraper blade (5) and integrally formed with the second scraper blade (5), wherein the angle of the cross section of the second cutter head (6) is 30°, and the front end of the first cutter head (3) is an R0.2 fillet; The first blade head (3) and the first scraper blade body (2), as well as the second blade head (6) and the second scraper blade body (5) are all offset by 1 mm overall; The offset angle between the first blade head (3) and the first scraper blade body (2), and the offset angle between the second blade head (6) and the second scraper blade body (5) are both 5°.

2. The method for producing an integrated chassis according to claim 1, wherein: The roughness of the outer surface in Step 1 and the inner surface in Step 6 are both greater than or equal to 3.

2.

3. The method for producing an integrated chassis according to claim 1, wherein: In Step 8, the contact position between the box body and the front and rear panels is chamfered to C0.5, and the single component painting method is used during painting.

4. The method for producing an integrated chassis according to claim 1, wherein: The front panel and the rear panel in Step 9 are processed by ordinary machining production methods.

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