48 results about "Explosive forming" patented technology

The invention provides a high hard, strength and tough nano-crystal metal bulk material and a preparation process thereof. The metal bulk material comprises an aggregate of metal nano-crystal grains, wherein an oxide, nitride, carbide, boride or the like of a metal or semimetal exists as a crystal grain growth inhibitor between and/or in the nano-crystal grains. The respective fine powders of nano-metal bulk material-forming components are mechanically alloyed (MA), using a ball mill or the like, thereby preparing nano-metal powders. Then, hot forming-by-sintering treatment such as spark plasma sintering, extrusion and rolling or explosive forming is applied to the powders to obtain a high hard, strength and tough nano-crystal metal bulk material.

The invention relates to a loading method suitable for field mixed loading of explosive and a tool used for the method. The loading method suitable for the field mixed loading of the explosive comprises the following steps: 1) putting constituted detonated explosive into an explosive forming bag, introducing a detonating fuse connected with the detonated explosive out of the explosive forming bag, and binding a load bearing rope with a load bearing belt of the explosive forming bag; 2) enabling an explosive conveying hose to extend into the bottom of the explosive forming bag from an explosive conveying hole of the explosive forming bag, and fixing the rope and a detonating fuse on the hole of a blasthole by a load bearing rod after the explosive forming bag is taken into place; and 3) starting a mixed loading truck for the explosive, injecting the explosive into the explosive forming bag, removing an antistatic locating rod out of the blasthole when the length of an injected explosive section reaches the requirement of a user, and taking out the explosive conveying hose after the explosive loading amount reaches a designed volume to finish the explosive loading operation of the position. The loading method suitable for the field mixed loading of the explosive can be widely used for loading a fracture rock blasthole and an air interval outline blasthole under various conditions that explosive mixed loading is adopted for ground drilling and blasting, such as mines, traffic, hydroelectric power and the like.

The invention relates to a bidirectional pressing liquid-charging forming method for a large-size thin-wall complex characteristic panel. The method comprises the following steps: coating lubricating oil on a single side of a thin-wall panel, thereby performing lubricating treatment; bulging the panel after being lubricated in advance in a pre-forming mould, thereby forming the rough shape of parts; reversely shaping the pre-formed panel in a shaping mould, thereby forming small circular bead features; cutting off addendum surfaces of the parts, thereby finally forming the parts. According to the bidirectional pressing liquid-charging forming method for the large-size thin-wall complex characteristic panel provided by the invention, the plasticity of the panel is fully utilized, the wall thickness reduction rate of the parts is effectively controlled and the panel parts with any complex shallow characteristics can be formed. Compared with the explosive forming of the traditional similar parts manufacturing method, the bidirectional pressing liquid-charging forming method has the advantages of high efficiency, low cost, convenience and safety in operation, high precision of formed parts, no manual repairing, and the like.

The invention relates to a method for constructing explosive-forming pile, which comprises: first, digging one horn well mouth at the soil; then at the center of well mouth, downwards drilling vertical tile hole to preset depth; arranging integrated drug pack into hole bottom; arranging sleeve at the center of borehole; filling bar drug pack into sleeve; filling mixed concrete or cement sand pulp between the borehole and sleeve; covering steel plate at the open of borehole; stacking carrier matter on the steel plate; exploding the drug pack and bar drug pack, after 3-8 hours when the filled concrete or cement sand pulp are poured, to form tile post and tile head with concrete protective layer; pouring concrete into tile head and tile post to form explosive-forming pile. The invention has simple process and better forming effect without reducing radius and sink hole.

The invention relates to a process for preparing nano-diamond black powder by virtue of detonation, and belongs to the technical field of preparation of nano-diamond black powder. According to the process, due to the improvement of the explosive forming process, a spherical explosive ball which takes initiating explosive columns as initiating points is prepared by using a spherical mold, the initiating explosive columns are uniformly distributed and embedded on the surface of the spherical explosive ball, 4-20 initiating points which are uniformly distributed on the surface of the spherical explosive ball are formed by cavities on the initiating explosive columns, so that the final nano-diamond black powder prepared by detonation has the advantages that the quality is high, the performance is good, the particle size distribution is uniform, the dispersion is easy, the subsequent treatment process is simple, and the yield of the nano diamond can be improved.

The invention provides a device and a method for forming a workpiece by utilizing electrified explosive shock waves of a metal foil. The method comprises the following steps: connecting the metal foil with a pulse power supply system to form a closed loop; putting metal foil is in a liquid environment; enabling the liquid in the liquid environment to be subjected to oxidation-reduction reaction with the metal foil; arranging a metal workpiece to be processed on the metal foil; enabling the metal workpiece to be machined to be partially located in the liquid environment, insulating the metal workpiece to be machined and the metal foil, thereby guaranteeing that liquid does not conduct electricity between the metal foil and the metal workpiece to be machined; introducing pulse current into the metal foil through the pulse power supply system, enabling the metal foil to explode under the action of the pulse current to generate violent shock waves, and enabling the metal foil and liquid in the liquid environment to be subjected to an oxidation-reduction reaction in the explosion process to release a large amount of energy; and under the action of the shock waves and the energy, enabling the metal workpiece to be machined to generate mechanical response to be machined and formed. The energy utilization rate in the explosive forming process of the metal foil is increased.

The invention relates to an explosive forming method of an arc-wave titanium anode plate. The titanium anode plate is exploded to form an arc-wave-shaped titanium anode plate of which the cross section is distributed in a uniform arc-wave mode. The method comprises the following steps: arranging a uniform arc-wave-shaped die on the bottom of a titanium plate, and fixing an expansion tube blasting fuse at the center of a die groove on the surface of the titanium plate, wherein the blasting fuse is not shorter than the die groove; and uniformly spreading fine sand on the expansion tube blasting fuse and the titanium anode plate, and simultaneously igniting the expansion tube blasting fuse to form the arc waves of the titanium anode plate at the same time. In the invention, the arc-wave anode plate is processed by explosion; and the anode plate is formed under the explosive action of the blasting fuse distributed by being matched with the wave of the die, thereby increasing the strength of the wave plate and enhancing the service performance of the material. Meanwhile, the invention reduces the large-size pressing machine and other facilities, lowers the energy consumption, enhances the production efficiency and lowers the production cost.

Provided are a multiple thin wall titanium tube and steel tube sheet hole simultaneous explosive welding composite tube sheet and a multiple thin wall titanium tube and steel tube sheet hole simultaneous explosive welding method. The multiple thin wall titanium tube and steel tube sheet hole simultaneous explosive welding method includes following steps: first, filling thin wall titanium tubes with explosives obtained through an optimized formula, wherein the wall thickness of the thin wall titanium tubes is 1-2mm, the optimized formula consists of components by weight part: 60-70 parts of theexplosives and the balance of ingredients composed of salt, perlite and saw powder, and the weight ratio of the salt, the perlite and the saw powder in the ingredients is 2:1:1; exposing unstable detonation ends out of two surfaces of a steel sheet separately by 2-10cm in explosive loading; secondly, controlling the distance between the outer wall of each thin wall titanium tube and the inner wall of each steel tube sheet hole as S=0.2*(delta+h), wherein the h is the thickness of titanium steel obtained after explosive forming, the delta is the diameter of the filling explosives, and the h isfar less than the delta; thirdly, using a series firing network for connecting all detonators, and controlling the length of a firing circuit within 200m. The multiple thin wall titanium tube and steel tube sheet hole simultaneous explosive welding method not only can guarantee safety of a heat exchanger, but also greatly prolongs use life of the heat exchanger, is high in production rate, can achieve welding forming of all tubes and tube sheets of the whole heat exchanger at a time.

The invention provides a low-cost destruct type non-contact antitank unmanned aerial vehicle. A support is mounted at the bottom of an unmanned helicopter, and a rotary shaft on the support is connected to the two sides of an explosive forming bomb, wherein a video gunsight is mounted on the side face of the explosive forming bomb. In the using process, the unmanned aerial vehicle is controlled tofly to the position above a target or the side face of the target, the explosive forming bomb is exploded after the target is aimed, the formed forming pill damages the target, and the unmanned aerial vehicle is destructed. Ground or water surface targets such as a vehicle, a tank armored car, a warship and a fortification can be attacked from above or the side face, an aerial target can be attacked as well, the technology is not complex, the cost is low, and the position of an operator is not exposed.

The invention provides a test device and method for explosive forming of a metal slotted pipe. The test device comprises a target tube, a pressure relief valve and a detonating cord sealing sleeve; the lower end of the target tube is connected with a bottom flange in a sealed manner; the upper end of the target tube is detachably connected with a top flange in a sealed manner; the target tube comprises an inner cavity capable of accommodating the metal slotted pipe; a pressurizing joint is arranged on the target tube and communicates with the inner cavity; a heating band layer is arranged on the outer wall of the target tube; the pressure relief valve is connected onto the top flange in a sealed manner and communicates with the inner cavity; the detonating cord sealing sleeve is connectedonto the top flange in a sealed manner; a detonating mandrel is arranged inside the metal slotted pipe; and a detonating cord of the detonating mandrel can penetrates out of the target tube via the detonating cord sealing sleeve. By the aid of the test device and method for explosive forming of the metal slotted pipe, downhole conditions can be simulated relatively truly, and a test foundation canbe provided for explosive forming of the metal slotted pipe.

With the invention, a device for fluid feed for explosive forming, which has a valve and an activating mechanism to activate the valve, is to be improved, so that the device permits both good filling of a die with fluid and good sealing during the explosive forming process in a technically simple design. This task is solved by a device for fluid feed for explosive forming that has a valve and an activating mechanism to activate the valve, in which the activating mechanism is arranged separate from the valve in an inactivated valve state.

A device for explosive forming of a tubular work piece includes a multipart explosive forming die, which defines a forming area having an inner surface corresponding to a final shape of the tubular work piece and a nozzle arrangement disposed adjacent to the forming area. The device also includes a plug for forming a seal by simultaneously deforming an end of the work piece and clamping the deformed end between the plug and a facing surface of the nozzle arrangement. In this way, the work piece itself contributes to the sealing of an internal explosion space. With insertion of new work piece blanks, and introduction of the plug during each individual forming process, new seals are produced in a convenient manner during subsequent forming processes. The device supports a simplified handling approach and integrates several functions into one working step, resulting in a shorter cycle times and cost-effective industrial production.