A processing optimization method for complex brazing-quenching electronic chassis frames

Abstract

This invention belongs to the field of mechanical manufacturing and processing technology, specifically to a method for optimizing the machining of complex brazed and hardened electronic chassis frames. This optimization method includes optimizing the process flow and parameters, optimizing the expansion of the brazing area, adding anti-deformation ribs, clamping screws with reverse pulls, and pre-welding clamping and positioning of separate components. This optimization method is designed to prevent chassis deformation and cracking during machining. This invention rationally optimizes factors influencing the complex brazed and hardened electronic chassis frames, including component process structure and parameters, to improve machining yields.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical manufacturing and processing, and particularly relates to a processing optimization method for a complex brazing-quenching electronic chassis frame. Background Art

[0002] Brazed electronic chassis often utilize 3A21-H112 rust-resistant aluminum, a material with excellent welding and corrosion resistance, making it widely used in brazed electronic chassis components. However, this material's low tensile strength is insufficient to meet the strength requirements of lightweight electronic chassis frames, leading to the use of 6061-T6 forged aluminum as the material of choice for the next generation of brazed electronic chassis. Compared to 3A21-H112, 6061-T6 has a narrower welding window, necessitating a good brazing structure for the parts. Failure to do so can easily lead to cold welds and substandard brazing rates. Furthermore, after brazing, the parts undergo a quenching process to increase their strength and hardness. This quenching process can lead to greater deformation and even cracking, necessitating the rational optimization of influencing factors, including the part's process structure and parameters, to improve the processing yield. Summary of the Invention

[0003] In view of this, the present invention provides a processing optimization method for a complex brazing-quenching electronic chassis frame, which reasonably optimizes influencing factors such as part process structure and parameters to improve the processing qualification rate.

[0004] The technical solution of the present invention is:

[0005] A method for optimizing the processing of a complex brazed and quenched electronic chassis frame, wherein the chassis is composed of two separate parts brazed together. The processing of the chassis comprises: machining the brazing surfaces of the two separate parts into place before brazing, and leaving a machining allowance on the non-brazed surfaces; after the two separate parts are brazed together, quenching heat treatment is performed, and then the entire chassis is machined into place.

[0006] The optimization method includes: a method for optimizing process flow and parameters, a method for optimizing the expansion of the brazing area, a method for adding anti-deformation process ribs, a method for reverse-pulling and clamping screws, and a method for clamping and positioning split parts before welding. The optimization method is used to prevent the chassis from deforming and cracking during the processing process.

[0007] Furthermore, the process flow and parameter optimization method includes:

[0008] Before brazing, the process structure of the two separate parts is optimized and the process parameters of vacuum brazing and vacuum quenching are set;

[0009] The specific methods for optimizing the process structure include an expansion optimization method for the brazing area, a method for adding anti-deformation process ribs, a screw reverse pulling and clamping method, and a pre-welding clamping and positioning method for split parts.

[0010] Furthermore, the method for setting the process parameters of vacuum brazing and vacuum quenching is specifically as follows:

[0011] The welding window of vacuum brazing is set at 580-590℃, and the window time is set at 20-30min; the temperature of vacuum quenching is set at 520-530℃; the temperature and window time are set to be adjustable according to the welding results of the first batch of chassis welding.

[0012] Furthermore, the expansion optimization method of the brazing area includes a two-dimensional expansion optimization method and a three-dimensional deformation optimization method;

[0013] Furthermore, the two-dimensional expansion optimization method combines the chassis structure to expand and connect the discrete and irregular brazing areas into a continuous and regular shape to the greatest extent possible. The expanded areas are configured to be removed during the post-brazing-quenching process.

[0014] The three-dimensional deformation optimization method is based on changing the step structure on both sides of the split part, transferring the step surface to the split part placed above the space so that the solder can be placed on the split part below the space; the three-dimensional deformation optimization method is used to enable the solder to be laid on the overall plane.

[0015] Furthermore, the method of adding the anti-deformation ribs is targeted at the open structure of the chassis. In combination with the specific structure of the chassis, the ribs are used to completely seal the chassis to avoid shrinkage caused by brazing and quenching processes.

[0016] Wherein: the process ribs are removed based on wire cutting before the final forming and finishing of the chassis.

[0017] Furthermore, the screw reverse pull clamping method is: setting two or more corners on the chassis process clamping handle, and then the chassis is clamped by the screw reverse pull process clamping handle.

[0018] Furthermore, the size of the process clamping handle is determined according to the specifications of the selected screw;

[0019] The thickness direction of the process clamping handle is the same height as the split part to be clamped;

[0020] The process clamping handle is removed based on wire cutting before performing side wall finishing on the chassis.

[0021] Furthermore, the pre-welding clamping and positioning method of the split parts is as follows:

[0022] In combination with the specific structure of the chassis, pin holes and / or threaded holes are added in a scattered manner in the brazing extension area. During assembly before welding, cylindrical pins are used based on the added pin holes, and / or countersunk screws are used based on the added threaded holes to accurately assemble and fit the two split chassis.

[0023] Furthermore, the pins and / or countersunk screws are destructively removed after brazing-quenching.

[0024] Beneficial effects of the present invention:

[0025] The present invention rationally optimizes influencing factors including parts process structure and parameters in a complex brazing-quenching electronic chassis frame, thereby improving the processing qualification rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0027] Figure 1 Structural diagram of the electronic chassis frame of the embodiment

[0028] Figure 2 Exploded view of an electronic chassis frame in an embodiment

[0029] Figure 3 Process flow chart of electronic chassis frame in embodiment

[0030] Figure 4 Schematic diagram of the reserved clamping handles on the left and right frames of the embodiment

[0031] Figure 5 Schematic diagram of the structure of the extended brazing area of ​​the left and right frames in the embodiment

[0032] Figure 6 Schematic diagram of the step structure of the air outlet after the left and right frames are three-dimensionally deformed in the embodiment

[0033] Figure 7 Schematic diagram of the structure of adding process ribs to the left and right frames of the embodiment

[0034] Figure 8 Schematic diagram of the left and right frame pre-welding positioning structure in the embodiment DETAILED DESCRIPTION

[0035] The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

[0036] The following describes the embodiments of the present disclosure through specific examples, and those skilled in the art can easily understand other advantages and effects of the present disclosure from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all of the embodiments. The present disclosure can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present disclosure. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present disclosure.

[0037] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on this disclosure, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects described herein can be used to implement an apparatus and / or practice a method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this apparatus and / or practice this method.

[0038] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present disclosure. The illustrations only show components related to the present disclosure and are not drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component can be changed at will, and the component layout type may also be more complicated.

[0039] Additionally, in the following description, specific details are provided to provide a thorough understanding of the examples. However, one skilled in the art will appreciate that the aspects described can be practiced without these specific details.

[0040] A processing optimization method for a complex brazing-quenching electronic chassis frame is disclosed. As shown in FIG1 , the chassis is composed of two separate parts brazed together. The processing of the chassis is as follows: the brazing surfaces of the two separate parts are machined into place before brazing, and a machining allowance is left on the non-brazing surfaces; after the two separate parts are brazed together, a quenching heat treatment is performed, and then the entire chassis is machined into place.

[0041] The optimization method includes: a method for optimizing process flow and parameters, a method for optimizing the expansion of the brazing area, a method for adding anti-deformation process ribs, a method for reverse-pulling and clamping screws, and a method for clamping and positioning split parts before welding. The optimization method is used to prevent the chassis from deforming and cracking during the processing process.

[0042] In this embodiment, the process flow and parameter optimization method includes:

[0043] Before brazing, the process structure of the two separate parts is optimized and the process parameters of vacuum brazing and vacuum quenching are set;

[0044] The specific methods for optimizing the process structure include an expansion optimization method for the brazing area, a method for adding anti-deformation process ribs, a screw reverse pulling and clamping method, and a pre-welding clamping and positioning method for split parts.

[0045] In this embodiment, the method for setting the process parameters of vacuum brazing and vacuum quenching is specifically as follows:

[0046] The welding window of vacuum brazing is set at 580-590℃, and the window time is set at 20-30min; the temperature of vacuum quenching is set at 520-530℃; the temperature and window time are set to be adjustable according to the welding results of the first batch of chassis welding.

[0047] In this embodiment, the expansion optimization method of the brazing area includes a two-dimensional expansion optimization method and a three-dimensional deformation optimization method;

[0048] In this embodiment, the two-dimensional expansion optimization method combines the chassis structure to expand and connect the discrete and irregular brazing areas into a continuous and regular shape to the greatest extent possible, and the expanded areas are configured to be removed in the post-brazing-quenching processing steps;

[0049] The three-dimensional deformation optimization method is based on changing the step structure on both sides of the split part, transferring the step surface to the split part placed above the space so that the solder can be placed on the split part below the space; the three-dimensional deformation optimization method is used to enable the solder to be laid on the overall plane.

[0050] In this embodiment, the method of adding the anti-deformation ribs is targeted at the open structure of the chassis. In combination with the specific structure of the chassis, the ribs are used to completely seal the chassis to avoid shrinkage caused by brazing and quenching processes.

[0051] Wherein: the process ribs are removed based on wire cutting before the final forming and finishing of the chassis.

[0052] In this embodiment, the screw back-pull clamping method is: setting two or more corners on the chassis process clamping handle, and then the screw back-pull process clamping handle to achieve the clamping of the chassis.

[0053] In this embodiment, the size of the process clamping handle is determined according to the specifications of the selected screw;

[0054] The thickness direction of the process clamping handle is the same height as the split part to be clamped;

[0055] The process clamping handle is removed based on wire cutting before performing side wall finishing on the chassis.

[0056] In this embodiment, the method for clamping and positioning the split parts before welding is specifically as follows:

[0057] In combination with the specific structure of the chassis, pin holes and / or threaded holes are added in a scattered manner in the brazing extension area. During assembly before welding, cylindrical pins are used based on the added pin holes, and / or countersunk screws are used based on the added threaded holes to accurately assemble and fit the two split chassis.

[0058] In this embodiment, the pins and / or countersunk screws are destructively removed after brazing and hardening.

[0059] Compared with the 3A21-H112 rust-proof aluminum material commonly used in brazed electronic chassis, the 6061-T6 material has high tensile strength and is suitable for lightweight electronic chassis (such as Figure 1 The structural requirements of the brazing process (shown in the figure) are met, but the welding window is relatively narrow. Therefore, it is imperative to ensure that the parts have a good brazing structure, otherwise it is easy to cause cold welds and substandard brazing rates. Furthermore, after brazing, a quenching process is required to increase the strength and hardness. Quenching will cause greater deformation and even cracking. Therefore, it is necessary to rationally optimize factors such as the part process structure and parameters to improve the processing qualification rate. This embodiment optimizes the processing of electronic chassis frames by optimizing the expansion of the brazing area, adding anti-deformation process ribs, a screw reverse clamping scheme, a pre-weld clamping and positioning method for split parts, and optimizing the process flow and parameters.

[0060] In this embodiment, the process structure optimization is performed before the split parts are welded. After vacuum brazing and vacuum gas quenching, the bench shaping process must be followed, and stress relief heat treatment is performed before CNC machining. The welding window of vacuum brazing is set at about 585°C, the window time is 25 minutes, and the temperature of vacuum gas quenching is controlled at about 525°C. The temperature and window time can be adjusted within a certain range based on the welding results of the first batch of welded parts. The process structure optimization method of the split parts before welding includes the expansion optimization method of the brazing area, the addition method of anti-deformation process ribs, the screw reverse clamping method, the pre-welding clamping and positioning method of the split parts, etc.

[0061] The expansion optimization method of the brazing area of ​​this embodiment includes the optimization methods of "two-dimensional expansion" and "three-dimensional deformation". "Two-dimensional expansion" needs to combine the structure of the part itself to expand and connect the discrete and irregular brazing areas into a continuous and regular shape as much as possible. These redundant expansion areas are guaranteed to be removed in the processing steps after brazing-quenching. "Three-dimensional deformation" allows the step structure on both sides of the split parts to be changed. Since one side of the part is a flat large surface and the other side is a step after the structure is changed, the part with the flat large surface is placed at the bottom during welding, and the whole piece of brazing material is laid on it. This not only facilitates the laying of the brazing material and avoids cutting, but also effectively ensures that the welding rate is qualified.

[0062] This embodiment's method for adding anti-deformation ribs targets open structures, preventing the severe shrinkage caused by brazing and quenching. Based on the specific structure of the part, the ribs are used to completely seal the surface, creating a single, flat surface. This not only reduces part deformation but also facilitates leveling and correction during the benchwork process. It's important to note that these ribs must be removed using wire cutting before finishing the part; milling or other methods should be avoided, as this will introduce new machining stresses and cause the part to flare.

[0063] The screw reverse pulling clamping method of this embodiment can adopt a scheme of leaving process clamping handles at two or more corners and fixing them by reverse pulling of screws in view of the structural characteristics of open parts and low rigidity. The size of the process handle can be designed to be a suitable size such as 24mmx24mm (the specific size is adjusted according to the screw specifications), and the thickness direction is the same height as the split parts. When actually used, it is matched with the special tooling at the bottom and tightened by screws. The clamping handle has been used since the split parts were processed, and is then brazed, quenched, and finished. The process clamping handle can be removed by wire cutting before finishing the side wall.

[0064] The pre-weld clamping and positioning method for the split parts of this embodiment is combined with the specific structure of the parts. Pin holes can be added to the brazing extension area. During pre-welding assembly, these pin holes are used to accurately assemble and fit the two split parts using cylindrical pins. In addition, to improve the clamping degree of the brazing surface fit in the middle area, threaded holes are added in a scattered manner in the brazing extension area. It is worth noting that the newly added positioning pin holes and brazing process threaded holes must be set within the brazing extension area to avoid affecting the original structure of the parts. The pins and countersunk screws can be destructively removed by the fitter after the parts are brazed and quenched, without affecting the finishing of the parts.

[0065] The electronic chassis structure of this embodiment is shown in Figure 1. The outer dimensions of the electronic chassis frame (hereinafter referred to as the frame) are 240mmx200mmx60mm, the thinnest part of the side walls and ribs is 0.5mm, the material removal rate is as high as 92%, the middle is connected only by wall panels and ribs, and the two ends are open. It is a typical low-rigidity machined part. The brazing and quenching processes will cause significant deformation of the parts (especially the severe shrinkage phenomenon in the open area). If effective anti-deformation measures are not taken, the parts will inevitably be scrapped.

[0066] As shown in the exploded view in Figure 2, the frame is brazed together by left and right frames. The brazing areas are mostly narrow and irregular. The brazing area of ​​the air outlet in the middle is even densely packed with narrow steps, which brings great inconvenience to the brazing operation. If a whole sheet of brazing material is used for laying, it is bound to cause the problem of excess material after the brazing material melts; if brazing material of corresponding shape is used for laying, it is difficult to cut and fit due to its irregular, discontinuous, and narrow strip shape. Another problem caused by the irregular, discontinuous, and narrow strip shape of the brazing area is the shape dislocation after brazing. This requires effective positioning and fixing methods. Otherwise, it will lead to inaccurate clamping and incorrect installation before brazing, and the left and right frames will slip and dislocate after brazing, which will eventually lead to the failure of part processing.

[0067] The overall process flow chart of frame parts can be found in Figure 3 The left and right frame parts are first processed for process structure optimization, and then assembled together using vacuum brazing technology. The shape is then corrected by the fitter to prevent quenching from increasing deformation. Next, vacuum quenching is performed, and the benchmark is corrected by the fitter. Then stress relief heat treatment is performed, and finally CNC milling and other CNC processing are performed. According to the optimized process flow, the processing qualification rate of parts can reach more than 99%.

[0068] In view of the open and low rigidity structural characteristics of the frame parts, an effective method is to reserve the clamping handles at the four corners and fix them by screw back pulling. The frame structure after the four corners are reserved is as follows Figure 4 As shown, the size of the process handle is 24mmx24mm, and the thickness direction is the same height as the left and right frames respectively. In actual use, it is matched with the special tooling at the bottom and tightened with the M12 hexagon socket head screw of GB / T 70.1-2008 specification. The clamping handle has been used since the split parts were processed, and then it is brazed, quenched, and the inner cavity surface and the two end surfaces are finished together. Before finishing the walls on both sides, the process clamping handles at the four corners are removed by wire cutting.

[0069] Expanding the brazing area Since the brazing area of ​​the electronic chassis frame is irregular, discontinuous and in the shape of narrow strips, it brings great difficulties to the cutting and laying of the solder, and the welding rate of parts. The article proposes an optimization method of "two-dimensional expansion" and "three-dimensional deformation" of the brazing area based on the part's own structure.

[0070] The structure of the rear frame after the brazing area is expanded is shown in the figure below. Figure 5 and Figure 6 As shown, this method combines the structure of the part itself to expand and connect the discrete, irregular brazing areas as much as possible into a continuous, regular shape. These redundant expansion areas are guaranteed to be removed during the CNC milling process after brazing and quenching. Since the expanded brazing area is continuous and regular, it is very conducive to the laying of the brazing material, and more importantly, it ensures the effectiveness of welding and the brazing rate. A small number of concave cavities on the brazing surface will be sealed after welding, and the area cannot be expanded and connected. However, since these areas are small, the brazing material will be absorbed by the base material after melting, so there is no need to cut out these areas separately when laying the brazing material.

[0071] The original air outlet structures of the left and right frame parts are densely packed with 1mm wide steps. Theoretically, after welding, the steps on the left and right sides fit together to form an air outlet. This structure is like teeth against teeth. Assembly before welding can easily lead to step misalignment. At the same time, since the solder is not attached to a flat large surface, it will bring great difficulties to the cutting and laying of the solder, and the soldering rate cannot be guaranteed.

[0072] The step structure after three-dimensional deformation is as follows Figure 6 As shown, the step on the lower part is cut off to align it with the bottom plane, while the step on the upper part is pulled down to the lower plane. This only changes the structure of the split part, and the air outlet structure of the frame part remains unchanged. Since one part has a flat large surface and the other has a step, the part with the flat large surface is placed at the bottom during welding, and the whole piece of solder is laid on it. This not only facilitates the laying of solder and avoids cutting, but also effectively ensures a qualified soldering rate.

[0073] Adding process ribs Both ends of the frame part are open structures, especially the left end. If anti-deformation process ribs are not added, serious shrinkage will occur after brazing and quenching. The actual test shows that the deformation tolerance of the inner cavity size is about 0.8mm. Due to the large deformation and the large cantilever structure on both sides, and the small island-like plane area on the left end face, the bench leveling process after brazing and quenching is very difficult, and even deformation of the inner cavity occurs after leveling. The left end is completely sealed with process ribs to make it a complete plane, which not only reduces the deformation of the part, but also facilitates the leveling and correction of the bench process. The frame structure after adding 7mm wide process ribs is as follows: Figure 7This rib is removed by wire cutting before finishing the frame parts. Do not use milling to remove it, otherwise it will introduce new processing stress and cause the parts to flare.

[0074] The design of the pre-welding assembly positioning structure for the pre-welding positioning split parts is as follows: Figure 8 As shown, two φ4 pin holes are added in the brazing extension area along the center axis of the part, as shown in the circled portion in the triangular area in the figure. During pre-welding assembly, cylindrical pins are used to accurately assemble and fit the two split parts based on these two pin holes. In addition, to improve the clamping degree of the brazing surface fit in the middle area, three M2 threaded holes are added in a scattered manner in the brazing extension area, as shown in the circled portion in the figure. During pre-welding assembly, M2 countersunk screws (consistent with the original fastening screws) are used to further fit and tighten the brazing surfaces of the two split parts to improve welding reliability. It is worth noting that the newly added locating pin holes and brazing process threaded holes are all within the brazing extension area and will not affect the original structure of the part. The pins and countersunk screws are destructively removed by the fitter after the part is brazed and quenched, and will not affect the finishing of the part.

[0075] The above description is merely a specific embodiment of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this disclosure should be included in the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection of the claims.

Claims

1. A processing optimization method for complex brazing-quenching electronic chassis frame, characterized in that: The chassis is composed of two separate parts brazed together; the processing process of the chassis is as follows: the brazing surfaces of the two separate parts are machined in place before brazing, and a machining allowance is left on the non-brazing surfaces; after the two separate parts are brazed together, quenching heat treatment is performed, and then the entire chassis is machined in place; The optimization method includes a method for optimizing process flow and parameters, and the optimization method is used to prevent the chassis from deforming and cracking during the processing; The process flow and parameter optimization method includes: optimizing the process structure of the two separate parts and setting the process parameters of vacuum brazing and vacuum quenching before brazing; The specific methods for optimizing the process structure include an expansion optimization method for the brazing area, a method for adding anti-deformation ribs, a method for reverse-pulling and clamping screws, and a method for clamping and positioning split parts before welding. The expansion optimization method of the brazing area includes a two-dimensional expansion optimization method and a three-dimensional deformation optimization method; the two-dimensional expansion optimization method combines the structure of the chassis itself to expand the discrete and irregular brazing areas to the maximum extent and connect them into a continuous and regular shape, and the expansion area is configured to be removed in the processing step after brazing-quenching; the three-dimensional deformation optimization method is based on changing the step structure on both sides of the split part, transferring the step surface to the split part placed above the space, so that the brazing material can be placed on the split part below the space. After the structure is changed, one side of the part is a flat large surface, and the other side of the part is a step. During welding, the part with the flat large surface is placed below; the three-dimensional deformation optimization method is used to enable the brazing material to be laid on the overall plane.

2. The processing optimization method of complex brazing-quenching electronic chassis frame according to claim 1 is characterized in that: The specific method for setting the process parameters of vacuum brazing and vacuum quenching is: The welding window of vacuum brazing is set at 580-590℃, and the window time is set at 20-30min; the temperature of vacuum quenching is set at 520-530℃; the temperature and window time are set to be adjustable according to the welding results of the first batch of chassis welding.

3. The processing optimization method of complex brazing-quenching electronic chassis frame according to claim 1 is characterized in that: The method of adding the anti-deformation ribs is targeted at the open structure of the chassis. In combination with the specific structure of the chassis, the ribs are used to completely seal the chassis to avoid shrinkage caused by brazing and quenching processes. Wherein: the process ribs are removed based on wire cutting before the final forming and finishing of the chassis.

4. The processing optimization method of complex brazing-quenching electronic chassis frame according to claim 3 is characterized in that: The screw reverse-pull clamping method comprises the following steps: arranging two-corner or multi-corner process clamping handles on the chassis, and then clamping the chassis by means of the screw reverse-pull process clamping handles.

5. The processing optimization method of complex brazing-quenching electronic chassis frame according to claim 4 is characterized in that: The size of the process clamping handle is determined according to the specifications of the selected screw; The thickness direction of the process clamping handle is the same height as the split part to be clamped; The process clamping handle is removed based on wire cutting before performing side wall finishing on the chassis.

6. The processing optimization method of complex brazing-quenching electronic chassis frame according to claim 5 is characterized in that: The specific method of clamping and positioning of split parts before welding is as follows: In combination with the specific structure of the chassis, pin holes and / or threaded holes are added in a scattered manner in the brazing extension area. During assembly before welding, cylindrical pins are used based on the added pin holes, and / or countersunk screws are used based on the added threaded holes to accurately assemble and fit the two split chassis.

7. The processing optimization method of complex brazing-quenching electronic chassis frame according to claim 6 is characterized in that: The pins and / or countersunk screws are removed destructively after brazing and hardening.

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