Integrated metal axle housing production method and system

Abstract

The invention provides an integrated metal axle housing production method and system, and discloses an integrated metal axle housing production method which comprises the following steps: obtaining a metal tube blank, and performing high-temperature extrusion diameter reduction on the metal tube blank to obtain the metal tube blank subjected to high-temperature extrusion diameter reduction; hot gas bulging forming is conducted on the metal pipe blank obtained after high-temperature extrusion reducing, and the metal pipe blank obtained after hot gas bulging forming is obtained; normal-temperature laser cutting is conducted on the metal pipe blank obtained after hot gas bulging forming, and the metal pipe blank obtained after normal-temperature laser cutting is obtained; the invention further discloses an integrated metal axle housing production system used for executing the integrated metal axle housing production method, and the integrated metal axle housing production system comprises a heating mechanism, an extrusion reducing mechanism, a hot gas bulging forming mechanism, a cooling mechanism and a cutting mechanism. The method has the advantages of extrusion diameter reduction and hot gas bulging processes at the same time, solves the technical problems of bulging process stabilization, bulging destressing, bulging material supplementation and the like, and has the advantages of few procedures, high production efficiency, controllable wall thickness of each part of the axle housing, obvious lightweight effect and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile parts manufacturing, and in particular to a method and system for producing an integrated metal bridge housing. Background Art

[0002] The bridge housing is an important component of the automobile drive axle. It supports the main reducer, differential and half-axle, fixes the axial relative position of the left and right drive wheels, and transmits the vehicle load to the wheels. The quality of the bridge housing has an important impact on the driving safety of the vehicle. The bridge housing forming process can be mainly divided into four types: casting, stamping and welding, mechanical expansion and hydraulic bulging (i.e. internal high pressure forming). At present, domestic drive axle housings mostly use traditional cast bridge housings and stamping and welding bridge housings. CN202321860324.3 announced a precision cast one-piece rear axle housing, which uses a precision casting process to manufacture the bridge housing. CN201821191908.5 announced an one-piece bridge housing forged by medium frequency heating, which uses a round bar billet forging process to manufacture the bridge housing. CN201210361146.X announced a seamless integrated forged bridge housing manufacturing process, the main process is: the initial blank is roll forged by a roll forging machine to form a bridge housing blank, and then the center pot is punched by a friction press, the center pot is loaded into a combination module, extruded by a multi-head extruder, overall shaped by a comprehensive molding machine, the burrs are removed by a trim machine, the center combination module precision forging blank is taken out, put into the normalizing furnace for aging and normalizing, and then subjected to flaw detection and radiography after cooling, cold pressing and correction, and the whole is subjected to rough cold processing, tempering heat treatment, and all-round finishing after cooling.

[0003] CN201811366652.1 discloses a new integrated bridge housing processing technology, which first places the tube blank into a tube reducing machine to reduce the diameter at both ends, then forms it in an internal high pressure forming machine, forms a fork speed package in the middle of the tube blank, and finally uses a laser cutting machine to cut the diameter of the fork speed package.

[0004] CN202311547325.7 discloses a new vacuum integrated bridge housing manufacturing process, which first places the tube blank into a water swelling forming mold, hydraulically forms the bridge package, and then reduces the diameter of the bridge tubes at both ends of the bridge package. CN202210384819.7 discloses a method for hot air expansion integrated forming of a lightweight drive bridge housing, which first selects a suitable original tube blank, then uses a tube blank rotary feeding method to apply pressure and shrinkage force to the original tube blank under the action of a multi-petal reduction mold and a mandrel to reduce its diameter, and finally puts it into a hot air expansion forming mold to form a bridge package.

[0005] In summary, the cast bridge shell has a complex and ideal cross-sectional shape, but it has a large mass, many processing surfaces, and a complex manufacturing process. In addition, the production process pollutes the environment and consumes materials and energy. The weight of the stamped and welded bridge shell is lighter than that of the cast bridge shell, but the wall thickness is single, the process is more, the material utilization rate is low, the weld quality is not easy to guarantee, and the welding pollutes the environment. There are oil leakage and breakage during use. The mechanical expansion process has the advantages of high material utilization, light weight, high strength, less welding workload, low equipment requirements and low cost. However, during expansion, the bridge shell is prone to transverse cracks at the process hole port, and wrinkles are prone to occur in the middle area of ​​the inner side of the bridge package, which seriously affects the structural strength and subsequent processing of the bridge shell, becoming the difficulty of this process. Compared with casting and stamping welding methods, the hydraulic expansion bridge shell has the advantages of reasonable wall thickness distribution, high material utilization, no welds, light weight, and high strength, but the production efficiency is low. At the same time, due to the limitation of equipment capacity, it is impossible to provide a sufficiently large liquid forming pressure and corresponding sealing technology. It is currently only used for the forming of small and medium-sized bridge shells. Summary of the invention

[0006] In response to the above-mentioned technical problems, a method and system for producing an integrated metal bridge shell are provided.

[0007] The technical means adopted by the present invention are as follows:

[0008] In a first aspect, a method for producing an integrated metal bridge housing comprises the following steps:

[0009] S1: obtaining a metal tube blank, and subjecting the metal tube blank to high temperature extrusion and sizing to obtain a metal tube blank after high temperature extrusion and sizing, wherein the metal tube blank after high temperature extrusion and sizing is composed of a first bridge tube, an initial bridge package, and a second bridge tube in sequence in an axial direction;

[0010] S2: hot-expanding the metal tube blank after high-temperature extrusion and sizing to obtain a hot-expanded metal tube blank, wherein the hot-expanded metal tube blank is composed of a first bridge tube, a process bridge package, and a second bridge tube in sequence in the axial direction;

[0011] S3: performing room temperature laser cutting on the metal tube blank after hot air expansion forming to obtain the metal tube blank after room temperature laser cutting, wherein the metal tube blank after room temperature laser cutting is composed of a first bridge tube, a target bridge package and a second bridge tube in sequence in the axial direction.

[0012] Furthermore, the initial bridge pack is a drum-shaped structure, and the step S1 comprises the following steps:

[0013] S11: obtaining a metal tube blank, placing the metal tube blank into a heating mechanism, wherein the heating mechanism heats the metal tube blank to a set target extrusion temperature and keeps the temperature for a set target time to obtain a metal tube blank to be extruded;

[0014] S12: placing the metal tube blank to be extruded into an extrusion and sizing mechanism, wherein the extrusion and sizing mechanism extrude a first bridge tube, an initial bridge package and a second bridge tube on the metal tube blank to be extruded, to obtain a metal tube blank after high-temperature extrusion and sizing.

[0015] Furthermore, the step S12 includes the following steps:

[0016] S121: coaxially arranging the metal tube blank to be extruded between the first extrusion through hole and the second extrusion through hole in the extrusion and diametral compression mechanism;

[0017] S122: Controlling the driving mechanism in the extrusion and diametral compression mechanism to drive the first extrusion through hole and the second extrusion through hole in the extrusion and diametral compression mechanism to move toward each other until the first extrusion through hole and the second extrusion through hole in the extrusion and diametral compression mechanism are respectively located at the set first target position and the second target position on the metal tube to be extruded;

[0018] S123: Control the driving mechanism in the extrusion and sizing mechanism to drive the first extrusion through hole and the second extrusion through hole in the extrusion and sizing mechanism to move in opposite directions until the first extrusion through hole and the second extrusion through hole in the extrusion and sizing mechanism are detached from the metal tube blank to be extruded, thereby obtaining the metal tube blank after high-temperature extrusion and sizing.

[0019] Furthermore, the process bridge package is a columnar structure, and the step S2 includes the following steps:

[0020] The metal tube blank after high-temperature extrusion and sizing is placed in a hot air bulging forming mechanism, and the hot air bulging forming mechanism processes the initial bridge package in the metal tube blank after high-temperature extrusion and sizing into a process bridge package to obtain the metal tube blank after hot air bulging.

[0021] Furthermore, the target bridge package is a process bridge package with a mounting hole on the bottom surface, and the step S3 includes the following steps:

[0022] S31: placing the hot-expanded metal tube blank into a cooling mechanism, wherein the cooling mechanism cools the hot-expanded metal tube blank to a set target cutting temperature to obtain a metal tube blank to be cut;

[0023] S32: placing the metal tube blank to be cut into a cutting mechanism, wherein the cutting mechanism opens a mounting hole on the bottom surface of the process bridge package in the metal tube blank to be cut, processes the process bridge package in the metal tube blank to be cut into a target bridge package, and obtains the metal tube blank after room temperature laser cutting.

[0024] In a second aspect, an integrated metal bridge shell production system is used to execute an integrated metal bridge shell production method as described in any one of the first aspects, comprising a heating mechanism, an extrusion and diametral compression mechanism, a hot air expansion forming mechanism, a cooling mechanism and a cutting mechanism.

[0025] Furthermore, the extrusion and compression mechanism includes an extrusion mechanism and a driving mechanism; the extrusion mechanism includes a first extrusion die and a second extrusion die, the first extrusion die is provided with a first extrusion through hole, the second extrusion die is provided with a second extrusion through hole, the first extrusion through hole and the second extrusion through hole are symmetrically arranged, and the axis of the first extrusion through hole and the axis of the second extrusion through hole are located on the same straight line; the telescopic direction of the driving mechanism is consistent with the axial direction of the first extrusion through hole and the axial direction of the second extrusion through hole, and the first extrusion die and the second extrusion die are respectively installed at both ends of the telescopic direction of the driving mechanism.

[0026] Further, the first extrusion through hole is composed of a first variable diameter extrusion part and a first equal diameter extrusion part, and the second extrusion through hole is composed of a second variable diameter extrusion part and a second equal diameter extrusion part; the first variable diameter extrusion part is a trumpet-shaped structure, the first equal diameter extrusion part is a cylindrical structure, the diameter of the large mouth of the first variable diameter extrusion part is larger than the outer diameter of the metal tube blank, the diameter of the small mouth of the first variable diameter extrusion part is smaller than the outer diameter of the metal tube blank, the diameter of the first equal diameter extrusion part is equal to the diameter of the small mouth of the first variable diameter extrusion part, the small mouth of the first variable diameter extrusion part is connected to one end of the first equal diameter extrusion part, and the axis of the first variable diameter extrusion part and the axis of the first equal diameter extrusion part are both located on the axis of the first extrusion through hole; the second variable diameter extrusion part is a trumpet-shaped structure The second equal-diameter extrusion part is a trumpet-shaped structure, the second equal-diameter extrusion part is a cylindrical structure, the diameter of the large opening of the second variable-diameter extrusion part is larger than the outer diameter of the metal tube blank, the diameter of the small opening of the second variable-diameter extrusion part is smaller than the outer diameter of the metal tube blank, the diameter of the second equal-diameter extrusion part is equal to the diameter of the small opening of the second variable-diameter extrusion part, the small opening of the second variable-diameter extrusion part is connected to one end of the second equal-diameter extrusion part, the axis of the second variable-diameter extrusion part and the axis of the second equal-diameter extrusion part are both located on the axis of the second extrusion through hole; the first variable-diameter extrusion part and the second variable-diameter extrusion part are symmetrically arranged, the first equal-diameter extrusion part and the second equal-diameter extrusion part are symmetrically arranged, and the first variable-diameter extrusion part and the second variable-diameter extrusion part are located between the first equal-diameter extrusion part and the second equal-diameter extrusion part.

[0027] Compared with the prior art, the present invention has the following advantages:

[0028] 1. In the present invention, the metal tube blank is first placed in the heating mechanism, the metal tube blank is heated to the set target extrusion temperature, and the temperature is kept at the set target time, so that the metal tube blank is in a state of low deformation resistance, and then the driving mechanism is started to drive the first extrusion through hole and the second extrusion through hole to extrude and compress the two ends of the metal tube blank at the same time to form the first bridge tube, the initial bridge package and the second bridge tube. The present invention solves the technical problems of stabilization of the bulging process, bulging stress relief, bulging material supplementation, etc., and has the advantages of fewer processes, high production efficiency, controllable wall thickness of each part of the bridge shell, and obvious lightweight effect.

[0029] 2. In the present invention, when the first extrusion through hole and the second extrusion through hole simultaneously extrude and compress the two ends of the metal tube blank under the drive of the driving mechanism, the two ends of the metal tube blank first contact with the first variable diameter extrusion part and the second variable diameter extrusion part respectively to form an initial bridge package, and then contact with the first equal diameter extrusion part and the second equal diameter extrusion part respectively to form a first bridge tube and a second bridge tube.

[0030] 3. In the present invention, the initial bridge package is processed into a process bridge package by a hot air bulging forming mechanism, so as to realize the processing of the metal tube blank after high-temperature extrusion and sizing into the metal tube blank after hot air bulging.

[0031] 4. In the present invention, the metal tube blank after hot air expansion is first cooled to a set target cutting temperature, and then a mounting hole is opened on the bottom surface of the process bridge package, and the process bridge package is processed into a target bridge package, so as to realize the processing of the metal tube blank after hot air expansion into the metal tube blank after room temperature laser cutting (i.e., an integrated metal bridge shell). BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0033] Figure 1 It is an overall structural diagram of the metal tube blank in the present invention, the metal tube blank after high-temperature extrusion and sizing, the metal tube blank after hot air bulging, and the metal tube blank after room-temperature laser cutting;

[0034] Figure 2 It is an overall structural diagram of the metal tube blank, the first extrusion die and the second extrusion die in the present invention;

[0035] Figure 3 It is an overall flow chart of the integrated metal bridge housing production method of the present invention;

[0036] In the figure: 1-first bridge tube; 2-initial bridge package; 3-second bridge tube; 4-process bridge package; 5-target bridge package; 6-installation hole; 7-first extrusion die; 8-second extrusion die; 701-first equal-diameter extrusion part; 702-first variable-diameter extrusion part; 801-second equal-diameter extrusion part; 802-second variable-diameter extrusion part. DETAILED DESCRIPTION

[0037] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0038] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0040] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, the numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0041] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0042] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0043] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0044] Embodiment 1:

[0045] like Figures 1 to 3 As shown, a method for producing an integrated metal bridge shell includes the following steps:

[0046] S1: obtaining a metal tube blank, and subjecting the metal tube blank to high temperature extrusion and sizing to obtain a metal tube blank after high temperature extrusion and sizing, wherein the metal tube blank after high temperature extrusion and sizing is composed of a first bridge tube 1, an initial bridge package 2, and a second bridge tube 3 in sequence in the axial direction;

[0047] S2: hot-expanding the metal tube blank after high-temperature extrusion and sizing to obtain a hot-expanded metal tube blank, wherein the hot-expanded metal tube blank is composed of a first bridge tube 1, a process bridge package 4, and a second bridge tube 3 in sequence in the axial direction;

[0048] S3: performing room temperature laser cutting on the metal tube blank after hot air expansion forming to obtain the metal tube blank after room temperature laser cutting, wherein the metal tube blank after room temperature laser cutting is composed of the first bridge tube 1, the target bridge package 5 and the second bridge tube 3 in sequence in the axial direction.

[0049] Specifically, a seamless steel pipe made of Q355 material with a diameter of Φ120 mm×3.5 mm and a thickness of Φ120 mm×3.5 mm is cut to a set target length to form a metal pipe blank.

[0050] In addition, the metal tube blank can also be a steel tube, other metal tubes, seamless tubes and welded tubes.

[0051] In this embodiment, the initial bridge package 2 is a drum-shaped structure, and the step S1 includes the following steps:

[0052] S11: obtaining a metal tube blank, placing the metal tube blank into a heating mechanism, wherein the heating mechanism heats the metal tube blank to a set target extrusion temperature and keeps the temperature for a set target time to obtain a metal tube blank to be extruded;

[0053] S12: placing the metal tube blank to be extruded into an extrusion and sizing mechanism, wherein the extrusion and sizing mechanism extrude a first bridge tube 1, an initial bridge package 2 and a second bridge tube 3 on the metal tube blank to be extruded, thereby obtaining a metal tube blank after high-temperature extrusion and sizing.

[0054] Specifically, the target extrusion temperature is 0.5 to 0.9 times the metal phase transition temperature, not exceeding the metal phase transition temperature, and the target time is greater than the minimum time required for the temperature of the metal tube to be uniform at all locations; in this embodiment, when the target extrusion temperature is 800°C, the target time is 30 minutes; when the target extrusion temperature is 850°C, the target time is 40 minutes.

[0055] In this embodiment, step S12 includes the following steps:

[0056] S121: coaxially arranging the metal tube blank to be extruded between the first extrusion through hole and the second extrusion through hole in the extrusion and diametral compression mechanism;

[0057] S122: Controlling the driving mechanism in the extrusion and diametral compression mechanism to drive the first extrusion through hole and the second extrusion through hole in the extrusion and diametral compression mechanism to move toward each other until the first extrusion through hole and the second extrusion through hole in the extrusion and diametral compression mechanism are respectively located at the set first target position and the second target position on the metal tube to be extruded;

[0058] S123: Control the driving mechanism in the extrusion and sizing mechanism to drive the first extrusion through hole and the second extrusion through hole in the extrusion and sizing mechanism to move in opposite directions until the first extrusion through hole and the second extrusion through hole in the extrusion and sizing mechanism are detached from the metal tube blank to be extruded, thereby obtaining the metal tube blank after high-temperature extrusion and sizing.

[0059] In this embodiment, the process bridge package 4 is a columnar structure, and the step S2 includes the following steps:

[0060] The metal tube blank after high-temperature extrusion and sizing is placed in a hot air bulging forming mechanism, and the hot air bulging forming mechanism processes the initial bridge package 2 in the metal tube blank after high-temperature extrusion and sizing into a process bridge package 4 to obtain the metal tube blank after hot air bulging.

[0061] In this embodiment, the target bridge package 5 is a process bridge package 4 with a mounting hole 6 on the bottom surface, and the step S3 includes the following steps:

[0062] S31: placing the hot-expanded metal tube blank into a cooling mechanism, wherein the cooling mechanism cools the hot-expanded metal tube blank to a set target cutting temperature to obtain a metal tube blank to be cut;

[0063] S32: The metal tube blank to be cut is placed into a cutting mechanism, wherein the cutting mechanism opens a mounting hole 6 on the bottom surface of the process bridge package 4 in the metal tube blank to be cut, and processes the process bridge package 4 in the metal tube blank to be cut into a target bridge package 5 to obtain the metal tube blank after room temperature laser cutting.

[0064] Specifically, the target cutting temperature is room temperature. In this embodiment, the target cutting temperature is 25°C.

[0065] Embodiment 2:

[0066] like Figure 1 to Figure 2 As shown, an integrated metal bridge shell production system is used to execute an integrated metal bridge shell production method described in any one of Example 1, including a heating mechanism, an extrusion and diametral compression mechanism, a hot air expansion forming mechanism, a cooling mechanism and a cutting mechanism.

[0067] Specifically, the heating mechanism is a heating furnace; the hot air expansion forming mechanism is a hot air expansion forming mold, which can provide sufficiently large gas pressure to make the side wall of the initial bridge package 2 completely and accurately fit the mold, thereby completing the forming of the process bridge package 4; the cooling mechanism is a slow cooling pit, and the metal tube blank after hot air expansion can be slowly and evenly cooled in the slow cooling pit without twisting and deformation; the cutting mechanism is a laser cutting machine, which can open the mounting hole 6 without damaging other surfaces of the process bridge package 4.

[0068] In this embodiment, the extrusion and compression mechanism includes an extrusion mechanism and a driving mechanism; the extrusion mechanism includes a first extrusion die 7 and a second extrusion die 8, the first extrusion die 7 is provided with a first extrusion through hole, the second extrusion die 8 is provided with a second extrusion through hole, the first extrusion through hole and the second extrusion through hole are symmetrically arranged, and the axis of the first extrusion through hole and the axis of the second extrusion through hole are located on the same straight line; the telescopic direction of the driving mechanism is consistent with the axial direction of the first extrusion through hole and the axial direction of the second extrusion through hole, and the first extrusion die 7 and the second extrusion die 8 are respectively installed at both ends of the telescopic direction of the driving mechanism.

[0069] Specifically, by adjusting the extrusion speeds of the first extrusion through hole and the second extrusion through hole, the diameter reduction at both ends and the material filling in the middle can be achieved. When the first extrusion through hole and the second extrusion through hole are respectively located at the set first target position and the second target position, the driving mechanism stops working, the length of the first bridge tube 1 and the length of the second bridge tube 3 both meet the standards, and an initial bridge package 2 with a drum-shaped structure is formed between the first bridge tube 1 and the second bridge tube 3.

[0070] In addition, the first extrusion die 7, the second extrusion die 8 and the driving mechanism can be arranged either horizontally or vertically.

[0071] In this embodiment, the first extrusion through hole is composed of a first variable diameter extrusion part 702 and a first equal diameter extrusion part 701, and the second extrusion through hole is composed of a second variable diameter extrusion part 802 and a second equal diameter extrusion part 801; the first variable diameter extrusion part 702 is a trumpet-shaped structure, the first equal diameter extrusion part 701 is a cylindrical structure, the diameter of the large opening of the first variable diameter extrusion part 702 is larger than the outer diameter of the metal tube blank, the diameter of the small opening of the first variable diameter extrusion part 702 is smaller than the outer diameter of the metal tube blank, the diameter of the first equal diameter extrusion part 701 is equal to the diameter of the small opening of the first variable diameter extrusion part 702, the small opening of the first variable diameter extrusion part 702 is connected to one end of the first equal diameter extrusion part 701, and the axis of the first variable diameter extrusion part 702 and the axis of the first equal diameter extrusion part 701 are both located on the axis of the first extrusion through hole; the second variable diameter extrusion part 802 is a trumpet-shaped Structure, the second equal-diameter extrusion part 801 is a cylindrical structure, the diameter of the large mouth of the second variable-diameter extrusion part 802 is larger than the outer diameter of the metal tube blank, the diameter of the small mouth of the second variable-diameter extrusion part 802 is smaller than the outer diameter of the metal tube blank, the diameter of the second equal-diameter extrusion part 801 is equal to the diameter of the small mouth of the second variable-diameter extrusion part 802, the small mouth of the second variable-diameter extrusion part 802 is connected to one end of the second equal-diameter extrusion part 801, the axis of the second variable-diameter extrusion part 802 and the axis of the second equal-diameter extrusion part 801 are both located on the axis of the second extrusion through hole; the first variable-diameter extrusion part 702 and the second variable-diameter extrusion part 802 are symmetrically arranged, the first equal-diameter extrusion part 701 and the second equal-diameter extrusion part 801 are symmetrically arranged, and the first variable-diameter extrusion part 702 and the second variable-diameter extrusion part 802 are located between the first equal-diameter extrusion part 701 and the second equal-diameter extrusion part 801.

[0072] Specifically, the angle between the first variable diameter extrusion part 702 and its axis, the angle between the second variable diameter extrusion part 802 and its axis, the slope length of the first variable diameter extrusion part 702 and the slope length of the second variable diameter extrusion part 802 can all be adjusted according to the diameter reduction ratio of the tube blank and the amount of bridge bag filling.

[0073] In addition, a first arcuate surface is disposed around the small opening of the first variable-diameter extrusion portion 702 , and a second arcuate surface is disposed around the small opening of the second variable-diameter extrusion portion 802 .

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for producing an integrated metal bridge shell, characterized in that: The following steps are involved: S1: obtaining a metal tube blank, and subjecting the metal tube blank to high temperature extrusion and sizing to obtain a metal tube blank after high temperature extrusion and sizing, wherein the metal tube blank after high temperature extrusion and sizing is composed of a first bridge tube (1), an initial bridge package (2), and a second bridge tube (3) in sequence in the axial direction thereof; S2: hot-expanding the metal tube blank after high-temperature extrusion and sizing to obtain a hot-expanded metal tube blank, wherein the hot-expanded metal tube blank is composed of a first bridge tube (1), a process bridge package (4) and a second bridge tube (3) in sequence in the axial direction; S3: performing room temperature laser cutting on the metal tube blank after hot air expansion forming to obtain a room temperature laser cut metal tube blank, wherein the room temperature laser cut metal tube blank is composed of a first bridge tube (1), a target bridge package (5) and a second bridge tube (3) in sequence in the axial direction thereof.

2. The method for producing an integrated metal bridge shell according to claim 1, characterized in that: The initial bridge package (2) is a drum-shaped structure, and the step S1 comprises the following steps: S11: obtaining a metal tube blank, placing the metal tube blank into a heating mechanism, wherein the heating mechanism heats the metal tube blank to a set target extrusion temperature and keeps the temperature for a set target time to obtain a metal tube blank to be extruded; S12: placing the metal tube blank to be extruded into an extrusion and sizing mechanism, wherein the extrusion and sizing mechanism extrude a first bridge tube (1), an initial bridge package (2) and a second bridge tube (3) on the metal tube blank to be extruded, thereby obtaining a high-temperature extruded and sizing-compacted metal tube blank.

3. The method for producing an integrated metal bridge shell according to claim 2, characterized in that: The step S12 comprises the following steps: S121: coaxially arranging the metal tube blank to be extruded between the first extrusion through hole and the second extrusion through hole in the extrusion and diametral compression mechanism; S122: Controlling the driving mechanism in the extrusion and diametral compression mechanism to drive the first extrusion through hole and the second extrusion through hole in the extrusion and diametral compression mechanism to move toward each other until the first extrusion through hole and the second extrusion through hole in the extrusion and diametral compression mechanism are respectively located at the set first target position and the second target position on the metal tube to be extruded; S123: Control the driving mechanism in the extrusion and sizing mechanism to drive the first extrusion through hole and the second extrusion through hole in the extrusion and sizing mechanism to move in opposite directions until the first extrusion through hole and the second extrusion through hole in the extrusion and sizing mechanism are detached from the metal tube blank to be extruded, thereby obtaining the metal tube blank after high-temperature extrusion and sizing.

4. The method for producing an integrated metal bridge shell according to claim 1, characterized in that: The process bridge package (4) is a columnar structure, and the step S2 comprises the following steps: The metal tube blank that has been shrunk by high-temperature extrusion is placed in a hot air expansion forming mechanism, and the hot air expansion forming mechanism processes the initial bridge package (2) in the metal tube blank that has been shrunk by high-temperature extrusion into a process bridge package (4), thereby obtaining the metal tube blank that has been shrunk by hot air expansion.

5. The method for producing an integrated metal bridge shell according to claim 1, characterized in that: The target bridge package (5) is a process bridge package (4) having a mounting hole (6) on the bottom surface, and step S3 comprises the following steps: S31: placing the hot-expanded metal tube blank into a cooling mechanism, wherein the cooling mechanism cools the hot-expanded metal tube blank to a set target cutting temperature to obtain a metal tube blank to be cut; S32: The metal tube blank to be cut is placed into a cutting mechanism, wherein the cutting mechanism opens a mounting hole (6) on the bottom surface of a process bridge package (4) in the metal tube blank to be cut, and processes the process bridge package (4) in the metal tube blank to be cut into a target bridge package (5), thereby obtaining a metal tube blank after room temperature laser cutting.

6. An integrated metal bridge shell production system, used to execute an integrated metal bridge shell production method according to any one of claims 1 to 5, characterized in that: The utility model comprises a heating mechanism, an extrusion and diameter compression mechanism, a hot air bulging forming mechanism, a cooling mechanism and a cutting mechanism.

7. The integrated metal bridge shell production system according to claim 6, characterized in that: The extrusion and diameter compression mechanism includes an extrusion mechanism and a driving mechanism; The extrusion mechanism comprises a first extrusion die (7) and a second extrusion die (8), the first extrusion die (7) is provided with a first extrusion through hole, the second extrusion die (8) is provided with a second extrusion through hole, the first extrusion through hole and the second extrusion through hole are symmetrically arranged, and the axis of the first extrusion through hole and the axis of the second extrusion through hole are located on the same straight line; The telescopic direction of the driving mechanism is consistent with the axial direction of the first extrusion through hole and the axial direction of the second extrusion through hole, and the first extrusion die (7) and the second extrusion die (8) are respectively mounted on both ends of the telescopic direction of the driving mechanism.

8. The integrated metal bridge shell production system according to claim 7, characterized in that: The first extrusion through hole is composed of a first variable diameter extrusion portion (702) and a first equal diameter extrusion portion (701), and the second extrusion through hole is composed of a second variable diameter extrusion portion (802) and a second equal diameter extrusion portion (801); The first variable diameter extrusion part (702) is a trumpet-shaped structure, the first equal diameter extrusion part (701) is a cylindrical structure, the diameter of the large opening of the first variable diameter extrusion part (702) is larger than the outer diameter of the metal tube blank, the diameter of the small opening of the first variable diameter extrusion part (702) is smaller than the outer diameter of the metal tube blank, the diameter of the first equal diameter extrusion part (701) is equal to the diameter of the small opening of the first variable diameter extrusion part (702), the small opening of the first variable diameter extrusion part (702) is connected to one end of the first equal diameter extrusion part (701), and the axis of the first variable diameter extrusion part (702) and the axis of the first equal diameter extrusion part (701) are both located on the axis of the first extrusion through hole; The second variable diameter extrusion part (802) is a trumpet-shaped structure, the second equal diameter extrusion part (801) is a cylindrical structure, the diameter of the large opening of the second variable diameter extrusion part (802) is larger than the outer diameter of the metal tube blank, the diameter of the small opening of the second variable diameter extrusion part (802) is smaller than the outer diameter of the metal tube blank, the diameter of the second equal diameter extrusion part (801) is equal to the diameter of the small opening of the second variable diameter extrusion part (802), the small opening of the second variable diameter extrusion part (802) is connected to one end of the second equal diameter extrusion part (801), and the axis of the second variable diameter extrusion part (802) and the axis of the second equal diameter extrusion part (801) are both located on the axis of the second extrusion through hole; The first variable diameter extrusion portion (702) and the second variable diameter extrusion portion (802) are symmetrically arranged, the first equal diameter extrusion portion (701) and the second equal diameter extrusion portion (801) are symmetrically arranged, and the first variable diameter extrusion portion (702) and the second variable diameter extrusion portion (802) are located between the first equal diameter extrusion portion (701) and the second equal diameter extrusion portion (801).

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