48results about How to "No melting phenomenon" patented technology

The invention discloses an impact shearing method and device for a charged shot. The impact shearing method for the charged shot comprises the steps that an impact shearing load not smaller than 450 t is applied to the shot in the radial direction of the shot so as to fracture the shot, and then an explosive is taken out of the fractured shot. The impact shearing method for the charged shot solves the problems that TNT wastewater is generated when TNT is recovered through a TNT charged shot steam spilling recovery method, and serious environment pollution is generated when non TNT charged shots (such as trinitrotoluene-nitronaphthalene charged shots, TNT-RDX-A1 charged shots and desensitized RDX-Al charged shots) are burnt out or bombed out in the field. The impact shearing device for the charged shot comprises a device body, a shearing tool, a fixing sleeve and a pushing device, wherein the shearing tool is arranged on the device body, connected with a power mechanism and used for shearing the shot in the radial direction, the fixing sleeve is installed on the side face of the shearing tool and used for locating the shot, and the pushing device is connected with the power mechanism and used for feeding the shot into the fixing sleeve along a feeding channel and making the shearing portion of the shot right face the shearing tool.

The invention discloses a high-ductility silver tin oxide contact material preparation method. The method comprises the following steps that (1) the silver tin oxide contact material ratio is preparedas required, the corresponding amount of silver, the corresponding amount of tin and the corresponding amount of an additive are calculated and weighed and then atomized to be made into powder afterbeing melted, and silver-tin alloy powder is obtained; (2) the silver-tin alloy powder is subjected to wet milling under the protective atmosphere condition, and silver-tin alloy powder subjected to ball milling is obtained; (3) the silver-tin alloy powder subjected to ball milling is oxidized, and silver tin oxide composite powder is obtained; (4) the silver tin oxide composite powder is subjected to molding, and a silver tin oxide blank is obtained; (5) the silver tin oxide blank is subjected to sintering under the condition that the oxygen partial pressure is higher than or equal to 0.8 Mpaand the temperature is 900-960 DEG C, and a high-ductility silver tin oxide ingot blank is obtained; and (6) the silver tin oxide ingot blank is subjected to heat extrusion, and a silver tin oxide wire rod or strip is obtained. A silver tin oxide contact material prepared through the method is uniform in structure and high in ductility, and the processability of the material is effectively improved.

The invention discloses a method for friction-deformation-diffusion welding of a circular-groove-assisted reinforcing tube plate, and aims to solve the problems that a high-temperature joint loosens, crevice corrosion occurs, the production process is complex and the cost is high when a tube and a tube plate of a heat exchanger are connected according to an expanded jointing method, a fusion welding method as well as a method integrating the expanded jointing method and the fusion welding method. The method provided by the invention comprises the following steps: (1) one or more circular grooves are formed in the inner wall of the tube plate; (2) the surfaces of the tube and the tube plate are scrubbed by adopting an organic solvent or a cleaning agent; (3) the tube and the tube plate are clamped in a clearance fit manner; (4) friction welding is performed, wherein the diameter of the large end of a friction needle is larger than the inner diameter a of the tube and smaller than the outer diameter b of the tube, so that the circular grooves can be fully filled with a thermoplastic tube material gradually to form mechanical meshing under the squeezing action of the friction needle; (5) when a shaft shoulder of a friction head is pressed in the upper surface of the tube plate at a depth of t, the friction head keeps rotating at a high speed and remains for 3-15 seconds, and then is lifted at a constant speed, so as to obtain a heat exchanging tube for friction-deformation-diffusion welding of the circular-groove-assisted reinforcing tube plate. The method is applicable to tube plate welding.

The invention provides a friction stir welding method for restraining welded joint thinning and thickening a welded joint. The friction stir welding method includes the steps that firstly, cleaning isconducted before welding, an oxide film on the surface of a sheet to be welded is removed by mechanical polishing, and then organic solvents or cleaning agents are adopted to wipe the surface of thesheet to be welded to remove sundries; secondly, materials and shapes of a stirring head and a consumptive friction head are selected, the material and the shape of the stirring head are determined according to the properties and the thickness of the sheet to be welded, the consumptive friction head is made of the same material as the sheet to be welded, and the diameter of the consumptive friction head is equal to or larger than that of shaft shoulders of the stirring head; thirdly, positioning is conducted, the relative position of the sheet to be welded is adjusted to make the axis of the stirring head and the axis of the consumptive friction head face the center line of a to-be-welded position of the sheet to be welded, and the consumptive friction head is arranged directly behind thestirring head; and fourthly, welding is carried out. The friction stir welding method eliminates welded joint thinning and achieves welded joint thickening, so that the service life of the welded joint is remarkably prolonged.

The heat insulating composite foamed phenolic plate for building includes one heat insulating foamed phenolic plate produced with foamed phenolic resin 100 weight portions, polyurethane 10-25 weight portions, epoxy resin 0.5-5 weight portions, fire retardant 10-20 weight portions, surfactant 0.5-2 weight portions, polyglycol 5-15 weight portions, glass fiber 0.5-2 weight portions, foam homogenizing agent 5-10 weight portions, foaming agent 5-10 weight portions and acid curing agent 5-10 weight portions; and one sprayed layer in the surface of the heat insulating foamed phenolic plate and comprising cement 100-150 weight portions, water 80-100 weight portions, emulsion of acrylate copolymer 90-110 weight portions, hydroxyethyl cellulose 3-6 weight portions and defoaming agent 0.5-2 weight portions. The heat insulating composite foamed phenolic plate has high toughness, less pulverizing, high strength and good construction performance.

The invention discloses a motor with a braking and decelerating mechanism and for an actuating device. The motor comprises a body, a rotary shaft and the braking and decelerating mechanism, wherein the rotary shaft is penetratingly connected at the center of the body, the braking and decelerating mechanism comprises a frictional component and a spiral spring, the frictional component is connected on the peripheral edge of the rotary shaft in a sleeved manner, the spiral spring is elastically clamped on the periphery of the frictional component, one end of the spiral spring is positioned on the body, and the spiral spring can press the frictional component to brake the rotary shaft to decelerate when the rotary shaft rotates unidirectionally. Consequently, the motor with the braking and decelerating mechanism and for the actuating device is prolonged in service life due to low loss of the spiral spring, and good in braking and decelerating performance due to large contact area between the frictional component and the rotary shaft.

The invention discloses a preparation method of an inorganic fireproof door core material, and belongs to the technical field of fireproof materials. The preparation method of the inorganic fireproof door core material is characterized by comprising the following steps that 1, cement slurry is prepared, wherein 1 part of sulfate aluminum cement, 0.002-0.01 part of water reducing agent, 0.002-0.01 part of basalt fiber and 0.3-0.4 part of water are mixed to be uniform for use; 2, a foam body is prepared, wherein a foaming agent is diluted, and the foam body is prepared; 3, the foam prepared in the second step and the cement slurry prepared in the first step are mixed according to the proportion of 2-6 mL / g, stirring is conducted to be uniform, the obtained mixture is poured into a mold, standard curing is conducted for 24 h, demolding is conducted, and then natural curing or standard curing is conducted for 7-28 days, and the inorganic fireproof door core material is obtained. When the inorganic fireproof door core material is subjected to a flame, dripping matter does not exist on the surface, the phenomena of curling and melting do not exist, and the inorganic fireproof door core material has the advantages of being good in use property and fireproof property and environmentally friendly.

The invention discloses a pet comb machining process. The pet comb machining process comprises a machining process A of a handle, a machining process B of a rubber sleeve and a combining process C for assembling the handle and the rubber sleeve, wherein in the process A and the process B, the pre-heating of a machine is divided into three sections; the first section is a temperature at a nozzle, the second section is a temperature in a material storage region and the third section is a temperature in a screw barrel; the temperatures of the three sections are higher than a dissolving temperature of raw materials entering the machine; when the raw materials enter the screw barrel, the raw materials can be primarily heated and dissolved in a conveying process of the screw barrel; then the raw materials enter the material storage region and are further sufficiently dissolved in the material storage region; the temperature of the material storage region is higher than the temperature of the screw barrel so that the mobility of the raw materials is improved when the raw materials enter the material storage region, and furthermore, the aim of sufficiently dissolving is achieved; and the material storage region further has a material storage function so that the raw materials sprayed out by the nozzle can be uniformly dissolved and the spraying amount of each time is the same.

The invention discloses a preparation method of a silver tin oxide contact material for improving the sintering property of an ingot blank. The method comprises the following steps that 1) according to the material proportion of a silver tin oxide contact needing to be prepared, silver, tin, and additives with the corresponding dosage are calculated and weighed, the mixture is melted and then atomized to prepare powder to obtain silver-tin alloy powder; 2) the silver-tin alloy powder is oxidized to obtain silver tin oxide composite powder; 3) the silver tin oxide composite powder is subjectedto wet grinding under a protective atmosphere condition so as to obtain the ball-milled silver tin oxide composite powder; 4) the ball-milled silver tin oxide composite powder is formed to obtain a silver tin oxide blank body; 5) the obtained silver tin oxide blank body is placed at the condition with the oxygen partial pressure higher than or equal to 0.8 Mpa, and the temperature of 900-960 DEG Cto be sintered to obtain the silver tin oxide ingot blank; and 6) the obtained silver tin oxide ingot blank is subjected to hot extrusion to obtain a silver tin oxide wire rod or a silver tin oxide strip material. The silver tin oxide contact material prepared by the method is uniform in structure and good in processing performance.

The invention discloses a water-cooled pulverizer, which includes a motor room, a casing, and a material collection box arranged at the bottom outlet of the casing, and the casing includes an upper hopper, a lower hopper, a crushing cavity, and a movable toothed disc. , and a fixed toothed plate connected to the casing through a hinge, a number of impellers are welded on the movable toothed plate and the fixed toothed plate, the size of the movable toothed plate coincides with the size of the fixed toothed plate, and It includes a cooling water channel arranged between the pulverizer casing and the pulverizing chamber. The pulverizer has a simple structure, firmness, stable operation, good crushing effect, and no dust pollution. It solves the melting phenomenon of heat-sensitive materials during the crushing process, improves the utilization rate of materials, and reduces production costs. The material can be directly discharged from the mill cavity of the main machine, and the particle size can be obtained by replacing the mesh screen with different apertures. Ensure material cleanliness.

The invention discloses a preparation method of titanium powder or titanium alloy powder special for porous titanium film. The method comprises: 1. placing the pressed titanium block or titanium alloy block in a furnace; 2. vacuumizing the furnace and keeping it warm ; 3. Fill hydrogen into the furnace to carry out self-propagating hydrogenation reaction; 4. Titanium block or titanium alloy block absorb hydrogen and saturate to obtain titanium hydride block or titanium hydride block; 5. Crushing and sieving; 6. Coarse powder crushing; 7. Titanium powder or titanium alloy dehydrogenation powder obtained by heat preservation and dehydrogenation; 8. Titanium powder and titanium alloy powder obtained by crushing, sieving, magnetic separation and flotation. The present invention utilizes the heat released by the hydrogenation reaction to meet the heat energy supply required for the continuation of the hydrogenation reaction to carry out a self-propagating hydrogenation reaction, reducing the increase in heat generated by the reaction, avoiding incomplete hydrogenation of the titanium block or titanium alloy block, and improving the efficiency of the titanium block or titanium alloy block. The degree of hydrogenation embrittlement of titanium alloy block can finally obtain finer and uniform titanium powder or titanium alloy powder, which improves the quality of titanium powder or titanium alloy powder.

The invention discloses a micro-fine processing system for the surface modification of materials using femto-second laser, comprising a femto-second laser, a micro-light path system, a high-precision three-dimensional working platform and a control system host machine, wherein the femto-second laser acquires an emitted laser beam to focus and irradiate onto processed components on the three-dimensional working platform through the micro-light path system; the micro-light path system comprises a microscope for the observation of processing, a light batch system with a CCD monitor imaging unit,and the three-dimensional working platform is connected with the control system host machine in a control way. The micro-fine processing system uses the femto-second laser as a processing light source to precisely process the surface modification of material through the characteristics of unique ultra-short duration and ultra-strong peak power of the femto-second laser, the cooperation of the optical system and the high-precision three-dimensional working platform and the control of a software program in order to achieve the ultra-precise processing in the sub-micron level for no presence of heat affected zone during the processing and to provide a useful tool for automobile industry, semiconductor, communication industry, and the like needing the high-precision processing.

The invention relates to a thermal insulating and fireproof board for an external wall. The board is prepared by mixing a boron modified phenolic resin composite material with a refractory aggregate, butyronitrile or butylbenzene, inorganic acid or organic acid, a mixture of silicone and sodium dodecyl benzene sulfonate, and a carbon dioxide gas and then curing the materials. With good fireproof and flame resistant performances as well as good thermal insulation property, the thermal insulating and fireproof board for an external wall in the invention also has high strength, and its combustion performance can reach the national A1 grade standard.

The invention discloses an atmosphere non-melting method assisted by thermal crosslinking of nitride fibers. The non-melting method comprises (1) placing a nitride fibril sample in a non-melting atmosphere furnace, vacuumizing and replacing it with nitrogen; (2) Under the nitrogen atmosphere, the temperature in the non-melting atmosphere furnace is raised from room temperature to 40-60°C, and then the active gas is introduced, and the flow ratio of the active gas to the nitrogen gas is (2:1)-(1:10 ); (3) continue to raise the temperature in the non-melting atmosphere furnace from 40 to 60°C to 100 to 150°C, and keep it at 100 to 150°C for 0.5 to 3 hours, then stop feeding the active gas; (4) continue to The temperature in the non-melting atmosphere furnace is raised from 100-150°C to 300-400°C, and kept at 300-400°C for 0.5-2h, then the heating is stopped and cooled to obtain the non-melting fibers. Compared with the single atmosphere non-melting cross-linking or thermal cross-linking method, the non-melting fiber obtained by the method provided by the invention is more uniform, and the degree of cross-linking reaction is higher; compared with the process control, the production cost is lower.