Low-cost explosion propagation device shell and efficient precision manufacturing method thereof

Abstract

The invention discloses a low-cost explosion propagation device shell and an efficient precision manufacturing method thereof. A flange and blind pipe two-section structure is adopted for preparation, and a thread structure and a welding connection mode are selected; machining, hot spinning and other processes are adopted to finish precise forming of the flange and the blind pipe; the flange and the blind pipe are connected and formed by adopting a vacuum electron beam welding process, finish machining after welding is not needed, and the shell can be directly used or transferred to the next procedure. The method has the advantages of being short in technological process, low in technical difficulty, high in material utilization rate, high in production efficiency, low in manufacturing cost (smaller than 1500 yuan / kg), good in shell comprehensive performance and the like, is suitable for low-cost and rapid batch manufacturing of explosion propagation device shells, and can better meet the development requirement of a low-cost advanced warhead structure manufacturing technology; and the method is also suitable for the structural design and low-cost, rapid and efficient manufacturing of the T / double-T type aluminum alloy thin-wall rotary barrel shell with the high requirements for small caliber, large length-diameter ratio and size precision in other manufacturing fields, and has high general technical value.

Description

Technical Field

[0001] The present invention belongs to the technical field of the manufacture of projectile / rocket warhead structures, and relates to a low-cost detonator housing and an efficient and precise manufacturing method therefor. Background Art

[0002] As one of the most important functional components for various projectile / rocket warheads to complete detonation and exert damage effects, the manufacturing technology thereof is one of the core directions of projectile / rocket warhead structure manufacturing technology.

[0003] A detonator usually consists of a housing (base), detonating cord, booster charge / amplifying charge column, etc. Among them, the housing, as the structural basis for carrying fuses, booster charges, etc. and ensuring their normal functioning and smooth completion of the detonation process, is an essential and important structural component in various detonators. At present, the housings of detonators mostly adopt lightweight aluminum alloys, usually T / double-T thin-walled rotary cylindrical shells including thick-walled flange sections (flanges) and thin-walled blind tube sections (blind tubes). Generally, the flange wall thickness is not less than 3.0 mm and the blind tube wall thickness is not more than 2.0 mm, having characteristics such as simple configuration, high sealing requirements, low mechanical property requirements, and low manufacturing difficulty.

[0004] In the manufacture of detonator housings, the traditional and mature solutions mainly adopt the three-section or integrated structure design solutions of flanges, straight pipe sections, and end caps (bottom caps). The former mainly adopts the segmented forming process solution mainly based on segmented machining + welding connection, and the latter adopts the one-time forming process solution of profile integrated machining. The two traditional technical routes have advantages such as low design difficulty, wide material sources, low process difficulty, good process stability, or stable product performance, and are also the most commonly used mature technical routes known to domestic military units at present. However, the two routes have many disadvantages such as extremely low material utilization rate (such as the integrated type), long process flow (such as the three-section type), many welds (such as the three-section type), long machining time (such as the integrated type), low production efficiency, or extremely high manufacturing cost (>3000 yuan / kg), and cannot meet the low-cost and rapid batch manufacturing requirements of detonator housings, and conflict with the development requirements of advanced warhead structure manufacturing technology for low-costization.

[0005] Therefore, it is necessary to carry out innovative manufacturing scheme design for the manufacturing requirements such as batch production efficiency, production cost control, and key performance guarantee of detonator housings, break through the framework constraints of traditional technical routes, propose a new structural design and introduce a mature forming process method, lay a technical foundation for improving manufacturing scheme design ability, product performance, raw material utilization rate, production efficiency, and reducing batch manufacturing costs, and thoroughly solve the manufacturing problems such as low batch production efficiency and high cost faced by detonator housings on the basis of ensuring and optimizing product performance, and better meet the development requirements of advanced warhead structure manufacturing technology for low-costization. Summary of the Invention

[0006] The primary technical problem to be solved by the present invention is to provide a low-cost housing for an explosive transfer device, which has the advantages of good process feasibility, low manufacturing cost, and good comprehensive performance of the housing.

[0007] Another technical problem to be solved by the present invention is to provide an efficient and precision manufacturing method for the above-mentioned low-cost housing of the explosive transfer device, which has the advantages of high process maturity, short process flow, low process cost, short production cycle, and high production efficiency.

[0008] The technical solution adopted by the present invention to solve the above primary technical problem is as follows: A low-cost housing for an explosive transfer device, the structural design of which is characterized in that:

[0009] The structure at the junction of the variable thickness of the housing of the explosive transfer device is decomposed into two structures: a flange and a blind tube.

[0010] For the blind tube, at the open end of the blind tube that intersects with the flange, an outer assembly section is provided for the two sections to be sleeved.

[0011] For the flange, at the end of the flange tube section that is connected to the open end of the blind tube, a through hole matching the outer diameter of the blind tube is provided as an inner assembly hole for the two sections to be sleeved.

[0012] For the assembly structure, a mating thread structure is adopted for the inner assembly hole of the flange and the outer assembly section of the blind tube.

[0013] For the connection and forming, a welding method is used to connect and form the assembled combination.

[0014] Furthermore, the housing of the explosive transfer device is applicable to all T / double-T type housings of the explosive transfer device.

[0015] Due to the structural design principle of this application and the analysis of the structural characteristics of the flange and the blind tube, the optimal process method and blank should be selected, which need to have the characteristics of high forming efficiency, high material utilization rate, low manufacturing cost, and good comprehensive performance;

[0016] Process selection: The flange is formed by machining, and the blind tube is formed by hot spinning.

[0017] Blank selection: According to the proposed process, the flange can select bar stock, sheet stock or pipe blank, and the blind tube selects sheet stock.

[0018] Flange forming: Machining is adopted and finish machining is carried out according to the design requirements.

[0019] Blind tube forming: A blind tube blank is manufactured by hot spinning and finish machining is carried out according to the design requirements.

[0020] The assembly positioning, in conjunction with the threaded structure, is specifically as follows: At the open end of the blind tube used for sleeving with the flange pipe section, an external thread is provided, and the thread length is equal to the thickness at the end of the flange pipe section; at the end of the flange pipe section used for sleeving with the open end of the blind tube, a threaded through-hole of the same specification as the external thread of the blind tube is provided. In this way, the sleeving and positioning of the flange and the blind tube are completed through the internal and external threads located on the internal assembly hole of the flange and the external assembly section of the blind tube; since the length of the external assembly section is equal to the thickness of the end of the flange pipe, the two structural sections have a sleeving and positioning fit structure before welding.

[0021] Connection and forming: The flange and blind tube assembly is connected and formed by using the aluminum alloy vacuum electron beam welding process.

[0022] The technical solution adopted by the present invention to solve the above-mentioned another technical problem is: A high-efficiency precision manufacturing method for a low-cost detonating device housing, characterized in that: adopting the detonating device housing structure of any one of the above, selecting aluminum alloy profiles as the blanks for the blind tube and the flange, the plate thickness is 1.5 - 3.0 times the wall thickness of the blind tube, and the bar diameter is 1.05 - 1.25 times the maximum diameter of the flange;

[0023] The specific steps are as follows:

[0024] 1) Preparation of the blind tube: The blind tube is manufactured by using the plate hot spinning and machining scheme. Cut the plate as the blind tube blank, and the diameter of the blind tube blank is 1.0 - 2.0 times the height of the blind tube. The blind tube blank is hot spun on a numerical control spinning machine to prepare a spun blank, and the wall thickness of the spun blank is reserved with a machining allowance of 0.3 - 2.0 mm; according to the design requirements of the blind tube, the spun blank is precisely machined on a lathe to obtain a blind tube with an external thread at the open end.

[0025] 2) Preparation of the flange: The flange is manufactured by using the bar machining scheme. Cut the bar as the flange bar blank, and the length of the bar blank is 1.05 - 1.1 times the height of the flange; according to the design requirements of the flange, the flange bar blank is successively rough machined and precisely machined on a lathe to obtain a flange with an internal threaded hole at the end of the flange pipe section.

[0026] 3) Clean and pre-dry the flange and blind tube prepared above.

[0027] 4) Complete the threaded sleeving of the flange and the blind tube to obtain a sleeved assembly.

[0028] 5) Load the sleeved assembly into a special vacuum electron beam welding tooling, transfer it to the vacuum chamber of the vacuum electron beam welding machine and perform positioning and fixing.

[0029] 6) Select appropriate process parameters for vacuum electron beam welding of aluminum alloy, and perform non-fill wire vacuum electron beam welding on the assembled combination to form an annular weld with small deformation, good morphology, and dense integrity at the threaded joint, obtaining a detonating device housing that does not require post-weld precision processing.

[0030] Finally, the aluminum alloy profile is 5A06 aluminum alloy.

[0031] Compared with the prior art, the advantages of the present invention are as follows: Adopting a two-stage structure and a technical route centered on less-remnant / non-remnant precision forming processes such as sheet hot spinning and vacuum electron beam welding not only avoids the manufacturing problems of low material utilization rate, high machining cost, and long machining cycle existing in the traditional integrated solution; but also avoids the technical defects such as long process flow, many welds, difficult positioning and form and position tolerance control, and complex welding fixtures existing in the traditional three-stage solution, as well as the manufacturing problems such as long production cycle and high performance detection cost; at the same time, vacuum electron beam welding can effectively guarantee the mechanical and sealing performance of the weld, and has the advantages of high forming accuracy, small welding deformation, and good weld morphology. The prepared detonating device housing can be directly used or transferred to the next process without post-weld precision machining, increasing the production efficiency of the detonating device housing by more than 3 times and reducing the manufacturing cost by more than 50%. The present invention has the advantages of short process flow, low technical difficulty, high material utilization rate, high production efficiency, low manufacturing cost (<1500 yuan / kg), and good comprehensive performance of the housing, is suitable for low-cost and rapid batch manufacturing of detonating device housings, and can better meet the development needs of low-cost advanced warhead structure manufacturing technology; it is also applicable to the structural design and low-cost, rapid and efficient manufacturing of small-caliber, large aspect ratio, and high dimensional accuracy requirements of T / double-T type aluminum alloy thin-walled rotary cylinder shells in other manufacturing fields, and has high general technical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] To more clearly illustrate the technical route and embodiments of the present invention, the following drawings are provided to make necessary supplementary explanations for the content in the embodiments. Obviously, the following drawings are only partial drawings in the embodiments of the present invention. For other technical personnel in the field, without creative work, other drawings can still be optimized based on the following drawings;

[0033] Figure 1 Schematic diagram of a 5A06 aluminum alloy double-T type detonating device housing in an embodiment of the present invention;

[0034] Figure 2 Schematic diagram of the flange design of a 5A06 aluminum alloy double-T type detonating device housing in an embodiment of the present invention;

[0035] Figure 3 Schematic diagram of the blind tube design of a 5A06 aluminum alloy double-T type detonating device housing in an embodiment of the present invention;

[0036] Figure 4 Schematic diagram of the connection and forming of the housing of the 5A06 aluminum alloy double-T type detonating device in the embodiment of the present invention;

[0037] It should be noted that the above Figures 1 to 4 is only a schematic diagram for clarifying the structural design idea of the present invention and the specific implementation approach for achieving low-cost, rapid and efficient manufacturing, and does not represent a specific part. Specific embodiments

[0038] The following further describes the present invention in detail in conjunction with the embodiments of the accompanying drawings.

[0039] The purpose of the present invention is to provide a low-cost detonating device housing and its high-efficiency and precision manufacturing method to solve the defects existing in the traditional technical route and meet the requirements of low-cost, rapid batch manufacturing of the detonating device housing.

[0040] To make the above technical route purpose, advantageous features and innovation of the present invention more obvious and understandable, it is necessary to further illustrate the present invention in detail with examples in conjunction with the accompanying drawings and specific embodiments. The following combines Figures 1 to 4 to clearly and completely describe the implementation process of one of the embodiments of the present invention.

[0041] In this embodiment, the double-T type 5A06 aluminum alloy detonating device housing, as Figure 1 shown, is prepared by a two-stage structure. According to the thickness characteristics analysis of the flange pipe section 22 and the straight pipe section 32, taking the junction of the two sections as the reference position, the detonating device housing 1 is divided into two sections, namely the flange 2 and the blind pipe 3, according to different thicknesses. The flange 2 includes the flange end face 21 and the flange pipe section 22 with equal thickness (as Figure 2 ), and the thin-walled blind pipe 3 includes the straight pipe section 32 and the end cover 31 with equal thickness (as Figure 3 ). Each adjacent section of the flange end face 21, the flange pipe section 22, the straight pipe section 32, and the end cover 31 is connected at a right angle; the two sections of the flange 2 and the blind pipe 3 are assembled by a nested structure, and the connection method is a threaded connection. Specifically: at the open end of the blind pipe 3 for nesting with the flange pipe section 22, an external thread 33 is provided, and the thread length is equal to the thickness at the end of the flange pipe section 22; at the end of the flange pipe section 22 for nesting with the open end of the blind pipe 3, an internal thread hole 23 with the same specification as the external thread 33 of the blind pipe 3 is provided; finally, it is connected into a nested combination and formed by welding to become the detonating device housing.

[0042] Among them, 5A06 aluminum alloy profiles are selected as the blanks for the blind pipe 3 and the flange 2. The thickness of the plate is 2.0 times the wall thickness of the blind pipe 3, and the diameter of the bar is 1.1 times the maximum diameter of the flange 2.

[0043] The specific method for manufacturing the detonating device housing is as follows:

[0044] I. Preparation of the blind tube 3: The blind tube 3 is manufactured by the hot spinning and machining process of plates. Cut the plate as the blank of the blind tube. The diameter of the blank of the blind tube is 1.5 times the height of the blind tube 3. Perform hot spinning on the blank on a numerical control spinning machine to prepare a spun blank. The machining allowance reserved for the wall thickness of the spun blank is 1.0 mm. According to the design requirements of the blind tube, perform precision machining on the spun blank on a lathe to obtain the blind tube 3 with an external thread 33 at the open end.

[0045] II. Preparation of the flange 2: The flange 3 is manufactured by the machining process of bars. Cut the bar as the blank of the flange. The length of the blank is 1.05 - 1.1 times the height of the flange 3. According to the design requirements of the flange 3, perform rough machining and precision machining on the blank of the flange on a lathe to obtain the flange 2 with an internal threaded hole 23 at the end of the flange pipe section 22.

[0046] III. Clean and pre-dry the prepared flange 2 and blind tube 3.

[0047] IV. Screw-connect through the internal threaded hole 23 and the external thread 33 to achieve the sleeving of the flange 2 and the blind tube 3, and obtain a sleeved combination.

[0048] V. Install the sleeved combination into a special vacuum electron beam welding fixture, transfer it to the vacuum chamber of the vacuum electron beam welder, and perform positioning and fixing.

[0049] VI. Select appropriate vacuum electron beam welding process parameters for 5A06 aluminum alloy, perform non-fill wire vacuum electron beam welding on the sleeved combination, and form an annular weld 43 with small deformation, good morphology, dense and complete at the screw-connection of the internal threaded hole 23 and the external thread 33, and obtain the detonating device housing 1 that does not require precision machining after welding.

[0050] In the present invention, specific embodiments are used to clearly illustrate the specific implementation manners of the present invention, etc., and prove the novelty and technical feasibility of the design of this technical route. This embodiment is only used to help understand the technical idea and core method of the present invention and is not unique; based on this embodiment, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

Claims

1. A low-cost explosion transmission device housing, the structural design of which is characterized by: The structure of the explosion transmission device shell with variable thickness is decomposed into two sections: flange and blind pipe. Blind pipe, the open end of the blind pipe that meets the flange is provided with an external assembly section for two-section assembly; The flange, at the end of the flange pipe section connected to the open end of the blind pipe, is provided with a through hole matching the outer diameter of the blind pipe as an inner assembly hole for the two sections to be assembled; Assembly structure, the flange inner assembly hole and the blind pipe outer assembly section adopt matching thread structure; Connection and forming: welding method is used to connect and form the set assembly.

2. The explosive transmission device housing according to claim 1, characterized in that: The explosion transmission device housing is suitable for all T / double T type explosion transmission device housings.

3. The explosive transmission device housing according to claim 1, characterized in that: The length of the outer assembly section is equal to the thickness of the end of the flange pipe, so that the two sections have a fitting and positioning matching structure before welding.

4. The explosive transmission device housing according to claim 1, characterized in that: The flange is formed by mechanical processing and is finely processed according to design requirements.

5. The explosive transmission device housing according to claim 1, characterized in that: The blind tube is formed by adopting a hot spinning process to manufacture a blind tube blank, and is finely processed and formed according to design requirements.

6. The explosive transmission device housing according to claim 1, characterized in that: The welding adopts the aluminum alloy vacuum electron beam welding process.

7. The explosive transmission device housing according to claim 1, characterized in that: The matching thread structure is specifically as follows: an external thread is arranged at the opening end of the blind pipe for fitting with the flange pipe section, and the thread length is equal to the thickness at the end of the flange pipe section; a threaded through hole with the same specification as the external thread of the blind pipe is arranged at the end of the flange pipe section for fitting with the opening end of the blind pipe.

8. A method for efficiently and precisely manufacturing a low-cost explosion transmission device housing, characterized in that: The shell structure of the explosive transmission device according to any one of claims 1 to 7 is adopted, and an aluminum alloy profile is selected as the blank of the blind pipe and the flange, the thickness of the plate is 1.5 to 3.0 times the wall thickness of the blind pipe, and the diameter of the rod is 1.05 to 1.25 times the maximum diameter of the flange; The specific steps are: 1) Preparation of blind tube: The blind tube is manufactured by hot spinning and machining of plates. The plate is cut as a blind tube blank. The diameter of the blank is 1.0 to 2.0 times the height of the blind tube. The blind tube blank is hot spun on a CNC spinning machine to prepare a spun blank. The wall thickness of the spun blank is reserved for a machining allowance of 0.3 to 1.0 mm. According to the design requirements of the blind tube, the spun blank is finely processed on a lathe to obtain a blind tube with an external thread at the open end; 2) Preparation of flange: The flange is manufactured by bar machining scheme, and the bar is cut as flange bar blank, and the length of the bar blank is 1.05 to 1.1 times of the flange height; according to the flange design requirements, the flange bar blank is rough-machined and precision-machined on a lathe to obtain a flange with an internal threaded hole at the end of the flange pipe section; 3) Cleaning and drying the flanges and blind pipes prepared above; 4) The thread assembly of the flange and the blind pipe is completed through the thread structure of the flange and the blind pipe to obtain a assembly assembly; 5) Load the suit assembly into a special vacuum electron beam welding tool, transfer it to the vacuum chamber of the vacuum electron beam welding machine, and position and fix it; 6) Select appropriate vacuum electron beam welding process parameters, perform vacuum electron beam welding on the set assembly without filler wire, form a circular weld with small deformation, good morphology, and dense and complete at the threaded joint, and obtain an explosive transmission device shell that does not require post-weld finishing treatment.

9. The method according to claim 8, characterized in that: The aluminum alloy profile is made of 5A06 aluminum alloy.

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