Machining optimization method for complex brazing-quenching electronic case frame

Abstract

The invention belongs to the technical field of mechanical manufacturing and machining, and particularly relates to a machining optimization method for a complex brazing-quenching electronic case frame. The optimization method comprises a process flow and parameter optimization method, a brazing area extension optimization method, an anti-deformation process bar adding method, a screw reverse pulling clamping method and a split part pre-welding clamping positioning method. The optimization method is used for preventing deformation and cracking of the case in the machining process. According to the method, influence factors including part process structures, parameters and the like in the complex brazing-quenching electronic case frame are reasonably optimized, and the machining qualification rate can be increased.

Description

Technical Field

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

[0002] Brazed electronic chassis mostly use 3A21-H112 rust-proof aluminum material, which has excellent welding and anti-corrosion properties and is widely used in brazed electronic chassis parts. However, the tensile strength of this material is low, which is not enough to meet the strength requirements of lightweight structural electronic chassis frames. As a result, 6061-T6 forged aluminum material is used as the material of choice for the new generation of brazed electronic chassis. Compared with 3A21-H112, the welding window of 6061-T6 material is narrower, so it is necessary to ensure that the parts have a good brazing structure, otherwise it is easy to cause cold welding and substandard brazing rate. In addition, after brazing, it needs to go through a quenching process to increase its strength and hardness. Quenching will cause greater deformation or even cracking. Therefore, it is necessary to reasonably optimize the influencing factors including the process structure and parameters of the parts to improve the processing qualification rate. 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 processing optimization method for a complex brazing-quenching electronic chassis frame, wherein 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 for the non-brazing surfaces; after the two separate parts are brazed together, a quenching heat treatment is performed, and then the chassis as a whole is machined in 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.

[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 method for optimizing the process structure includes an expansion optimization method for the brazing area, a method for adding anti-deformation process ribs, a screw reverse pulling 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 welding chassis.

[0012] Further, 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, and the expansion area is configured to be removed in the post-braze-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 for adding the anti-deformation process ribs is aimed at the open structure of the chassis, and combined with the specific structure of the chassis, the process ribs are used to completely seal it up to avoid the shrinkage phenomenon caused by the brazing and quenching process;

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

[0017] Furthermore, the screw back-pull clamping method is: a two-corner or multi-corner process clamping handle is set on the chassis, and then the chassis is clamped by the screw back-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 specifically as follows:

[0022] In combination with the specific structure of the chassis, pin holes and / or threaded holes are added in a dispersed 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 reasonably 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 drawings required for use in the embodiments will be briefly introduced below. 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 creative work.

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

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

[0029] Figure 3 Process flow chart of electronic chassis frame of 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 left and right frame extension brazing area 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 reserved for positioning before welding 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 the following embodiments and features in the embodiments can be combined with each other without conflict. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in the 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 the present 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 the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device 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 rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0039] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects described may be practiced without these specific details.

[0040] A processing optimization method for a complex brazing-quenching electronic chassis frame, as shown in FIG. 1, the chassis is composed of two separate parts brazed together; the processing process of the chassis is: the brazing surfaces of the two separate parts are machined in place before brazing, and a machining allowance is left for the non-brazing surfaces; after the two separate parts are brazed together, quenching heat treatment is performed, and then the chassis is machined in place as a whole;

[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.

[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 method for optimizing the process structure includes an expansion optimization method for the brazing area, a method for adding anti-deformation process ribs, a screw reverse pulling 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 welding chassis.

[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, and the expanded areas are configured to be removed in the processing steps after brazing-quenching;

[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 for adding the anti-deformation process ribs is aimed at the open structure of the chassis. Combined with the specific structure of the chassis, the process ribs are used to completely seal it up to avoid the shrinkage phenomenon caused by the brazing and quenching process;

[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: a two-corner or multi-corner process clamping handle is set on the chassis, and then the chassis is clamped by the screw back-pull process clamping handle.

[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 dispersed 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 the present exemplary embodiment, the pins and / or countersunk screws are destructively removed after brazing-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 As shown in the figure, the structural requirements of the brazing process are met, but the welding window is narrow, so it is necessary to ensure that the parts have a good brazing structure, otherwise it is easy to cause false welding and substandard brazing rate. In addition, after brazing, it is necessary to go through a quenching process to increase its strength and hardness. Quenching will cause a greater degree of deformation or even cracking. Therefore, it is necessary to reasonably optimize the influencing factors including the process structure and parameters of the parts to improve the processing qualification rate. This embodiment is based on the expansion optimization method of the brazing area, the method of adding anti-deformation process ribs, the screw reverse clamping scheme, the pre-welding clamping and positioning method of the split parts, the process flow and parameter optimization method, etc. to achieve the processing optimization of the electronic chassis frame.

[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 according to 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 method of adding anti-deformation process ribs, the method of screw reverse clamping, the method of pre-welding clamping and positioning 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 the qualified welding brazing rate.

[0062] The method of adding the anti-deformation process ribs in this embodiment is aimed at the open structure, avoiding the serious shrinkage phenomenon caused by the brazing and quenching process. Combined with the specific structure of the part, the process ribs are used to completely seal it up to form a complete plane, which not only reduces the deformation of the part, but also facilitates the leveling and correction of the bench work process. It is worth noting that the process ribs must be removed by wire cutting before the part is fine-machined, and it is forbidden to use milling or other methods to remove them, otherwise new processing stress will be introduced to cause the part to flare.

[0063] The screw reverse-pull clamping method of this embodiment can adopt a solution of leaving process clamping handles at two or more corners and fixing them by reverse-pull 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 cooperated 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 fine-machined together. The process clamping handle can be removed by wire cutting before fine-machining the side wall.

[0064] The pre-welding clamping and positioning method of the split parts of this embodiment is combined with the specific structure of the parts, and pin holes can be added in the brazing extension area. During the pre-welding assembly, these pin holes are used to accurately assemble and fit the two split parts using cylindrical pins. In addition, in order 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 in 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, and will not affect the finishing of the parts.

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

[0066] like Figure 2 As shown in the exploded view, the frame is brazed by the left and right frames. Most of the brazing areas are narrow strips and very irregular. The brazing area of ​​the air outlet in the middle part even uses densely packed 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 is melted; 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-shaped brazing area is the shape dislocation after brazing, which requires effective positioning and fixing methods. Otherwise, the clamping before brazing will not be accurate or installed properly, 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, then assembled together and welded using vacuum brazing technology, and then the fitter corrects the appearance to prevent quenching from increasing deformation. Next, vacuum quenching is performed, and then the fitter corrects the benchmark, and 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 process clamping handles at the four corners and fix them by reverse pulling of screws. The frame structure after the process handles are reserved at the four corners 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 is finished, and the two end surfaces are finished. 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, the welding brazing rate of parts, etc. This article proposes an optimization method of "two-dimensional expansion" and "three-dimensional deformation" of the brazing area according to the part's own structure.

[0070] The structure of the 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 parts to expand and connect the discrete and irregular brazing areas into continuous and regular shapes as much as possible. These redundant expansion areas are guaranteed to be removed in the CNC milling process after brazing-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 in area, the brazing material will be absorbed by the base material after melting, so there is no need to cut these areas separately when laying the brazing material.

[0071] The original air outlet structure of the left and right frame parts is densely distributed 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 of the lower part is cut off and aligned with the bottom plane, and the step of 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 does not change. Since one side of the part is a flat large surface and the other side is a step after the structure change, 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 the qualified soldering rate.

[0073] Both ends of the frame parts are open structures, especially the left end. If anti-deformation 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, 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 ribs to form a complete plane, which not only reduces the deformation of the parts, but also facilitates the leveling and correction of the bench process. The frame structure after adding 7mm wide ribs is as follows: Figure 7As shown. This process 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 central axis of the part, as shown in the circled part in the triangular area in the figure. During the pre-welding assembly, the two split parts are accurately assembled and fitted with cylindrical pins based on these two pin holes. In addition, in order to improve the clamping degree of the brazing surface in the middle area, three M2 threaded holes are added in a scattered manner in the brazing extension area, as shown in the circled part in the figure. During the 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 the reliability of welding. It is worth noting that the newly added positioning pin holes and brazing process threaded holes are all in the brazing extension area, which will not affect the original structure of the parts. The pins and countersunk screws are destructively removed by the fitter after the parts are brazed and quenched, and will not affect the finishing of the parts.

[0075] The above is only a specific implementation of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present disclosure should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope 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 chassis as a whole is machined in place; 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.

2. The processing optimization method of complex brazing-quenching electronic chassis frame according to claim 1 is characterized in that: The optimization method of the process flow and parameters includes: Before brazing, the process structure of the two separate parts is optimized and the process parameters of vacuum brazing and vacuum quenching are set; The specific method for optimizing the process structure includes an expansion optimization method for the brazing area, a method for adding anti-deformation process ribs, a screw reverse pulling clamping method, and a pre-welding clamping and positioning method for split parts.

3. The processing optimization method of complex brazing-quenching electronic chassis frame according to claim 2 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 welding chassis.

4. The processing optimization method of complex brazing-quenching electronic chassis frame according to claim 3 is characterized in that: The expansion optimization method of the brazing area includes a two-dimensional expansion optimization method and a three-dimensional deformation optimization method.

5. The processing optimization method of complex brazing-quenching electronic chassis frame according to claim 4 is characterized in that: 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 expansion area is configured to be removed in the post-brazing-quenching process; 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.

6. The processing optimization method of complex brazing-quenching electronic chassis frame according to claim 5 is characterized in that: The method for adding the anti-deformation process ribs is aimed at the open structure of the chassis. In combination with the specific structure of the chassis, the process ribs are used to completely seal it up to avoid the shrinkage phenomenon caused by the brazing and quenching process. Wherein: the process ribs are removed based on wire cutting before the final forming and finishing of the chassis.

7. The processing optimization method of complex brazing-quenching electronic chassis frame according to claim 6 is characterized in that: The screw reverse-pull clamping method comprises: arranging two-corner or multi-corner process clamping handles on the chassis, and then clamping the chassis through the screw reverse-pull process clamping handles.

8. The processing optimization method of complex brazing-quenching electronic chassis frame according to claim 7 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.

9. The processing optimization method of complex brazing-quenching electronic chassis frame according to claim 8 is characterized in that: The specific method of clamping and positioning the 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 dispersed 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.

10. The processing optimization method of complex brazing-quenching electronic chassis frame according to claim 9 is characterized in that: The pins and / or countersunk screws are removed destructively after brazing-hardening.

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