211results about How to "Prevent deformation and cracking" patented technology

The invention relates to an electroslag remelting technique, in particular to a vacuum/gas shield electroslag remelting continuous directional solidification device and method. The device comprises a power supply, a consumable electrode (1), a water-cooling crystallizer (2) and a gas shield system, wherein the lower part of the water-cooling crystallizer (2) is provided with a water-cooling chassis (7) and a stripping device (13), and a two-circuit control mode is adopted by the consumable electrode (1) to make the stripping speed equivalent with the solidification speed of a cast ingot. The invention has simple operation and low cost, is convenient to control, can be used for producing large-dimension low-segregation directional solidification cast ingots and is suitable for mass production and application.

The invention relates to an inside-laser coaxial powder feeding laser impacting and forging composite machining forming device and method. The device comprises a master controller, a pulse laser device, a continuous laser device, a temperature inductor, a coaxial powder feeding device, a visual tracking system, a workbench, a mechanical arm, a metal powder container and a gas container. The pulse laser device, the continuous laser device, the temperature inductor and the visual tracking system are all arranged above the workbench. The mechanical arm tightly clamps the coaxial powder feeding device, so that the coaxial powder feeding device is located between the continuous laser device and the workbench, and is coaxial with the continuous laser device. The coaxial powder feeding device communicates with the metal powder container and the gas container. The pulse laser device, the continuous laser device, the temperature inductor, the visual tracking system, the mechanical arm, the metal powder container and the gas container are all connected with the master controller. The inside-laser coaxial powder feeding laser impacting and forging composite machining forming device and method can solve the problems of insufficient fusion and incomplete fusion of the Gaussian light spot edges, inner defects of gas holes, incomplete fusion, cracks and shrinkage are effectively eliminated, and the inner stress state of a formed part is greatly improved.

The invention discloses a lightweight flame retardant and foamy filling material of cement doors and manufacturing method thereof, comprising magnesium oxide, magnesium sulphate, fly ash, high alumina refractory cement, calcium chloride, water proofing agent, water reducing agent and foaming agent, with bulk density ranging between 200 kg/m³ and 500kg/m³; the ingredients are formulated by weight at a rate of: magnesium oxide (40 percent -55 percent), magnesium sulfate (15 percent-40 percent), fly ash (5 percent-20 percent), high alumina refractory cement (5 percent-20 percent), calcium chloride (2 percent-6 percent), water proofing agent (2 percent5 percent), water reducing agent (0.2 percent1.5 percent) and foaming agent (0.1 percent-0.5 percent). With the technical solution, the product has the advantages of high strength, light weight, flame retardancy, sound insulation, weather resistance, thermal resistance, energy efficient, freedom from toxicity, harm and irradiation, low manufacturing cost, simple process, etc, which can be widely employed for fire/theft proof metal interior door, building material and like sectors.

An oil pump shaft machining process includes steps of 1) feeding a blank; 2) turning two end faces and perforating a central hole; 3) roughly turning an outer circle with margin of 0.5 mm; 4) performing quenched-tempered heat treatment; 5) repairing and grinding the central hole; 6) finely turning an outer circle, grooving, turning a thread, and reserving grinding allowance of 0.3 mm after finely turning the outer circle; 7) milling a key slot; 8) cold rolling a spline; 9) locally quenching the outer circle surface at high frequency; 10) annealing at the low temperature, heating to 150-180 DEG C during annealing at the low temperature and preserving temperature for 2.5 hours; 11) repairing and grinding the central hole; 12) finely grinding the outer circles. By the oil pump shaft machining process, contact positions of a machined oil pump shaft with a deep groove ball bearing, an oil seal and a slide bearing are good in wear resistance, and the machined oil pump shaft is high in small-modulus spline machining efficiency, good in tooth form structure, resistant to impact and high in strength.

The invention relates to an ink-jet penetrated polished semitransparent ceramic sheet. The ink-jet penetrated polished semitransparent ceramic sheet comprises a semitransparent green body containing an ink dyeing assistant agent, and an ink jet penetrating layer penetrating into the semitransparent green body. According to a preparation method, the ink dyeing assistant agent is added into the semitransparent green body, and ink jet penetrating technology is adopted, so that penetration of patterns into the semitransparent green body is realized, polishing is carried out directly after sintering, green body surface particle flatness is excellent, stain resistance is excellent, pattern wear resistance is excellent, and requirements on highlight products are satisfied, adding of a transparent glaze layer onto the surface of the green body is not necessary, cost is reduced, a problem that bonding of the glaze layer with the green body is poor is solved, production deformation cracking is avoided, the preparation method of the green body is simple, adding of non-transparent preform body is unnecessary, and in addition, the semitransparent green body contains the ink dyeing assistant agent, so that the color of the patterns used for decoration is bright, sharpness is high, and decoration requirements can be satisfied preferably.

The invention provides alloyed powder for directly printing metal parts in a 3D (three-dimensional) manner. The alloyed powder is characterized in that nanometer aluminum is adhered to the surface of oxide of iron through a layer of thin tin powder to form iron-base alloy microspheres, the grain size of the microspheres is 2-10 micrometers, the sphericity is greater than 95%, and the alloyed powder comprises the following materials in part by weight: 60-70 parts of iron oxide, 30-40 parts of nanometer aluminum and 0.1-0.5 part of tin powder. The alloyed powder can be directly used for printing the metal parts in the 3D manner. When the alloyed powder is used for directly printing the metal parts in the 3D manner, the iron oxide is gradually reduced through aluminum, structure deformation caused by direct fusion molding of metal, cooling crystallization is uniform, the strength of a molded piece is improved by formed aluminum oxide, the porosity of products is reduced, and the compactness is high. The alloyed powder can be used for directly printing the high-precision metal parts which have complication shapes.

The invention relates to a full-automatic sterilizing quality-guaranteeing steamer and a sterilizing technology which are suitable for sterilizing and quality guaranteeing of fully closed box-packed fast food. The steamer comprises a pot body, a pot cover, a steam pipe, a return water storage tank, a vent pipe, a water cycle pipeline and a drain pipe, wherein the water cycle pipeline comprises a return water pipe, a chief spray pipe, a water inlet pipe and a water outlet pipe, the pot body is provided with a thermometer I, a pressure gauge I, a water-thermometer I and a reducing valve I, and is connected with an automatic control box, the pot cover is hermetically connected with the pot body, the pot body is connected with the steam pipe, the vent pipe, the chief spray pipe and the water outlet pipe, the return water storage tank is connected with the return water pipe and the vent pipe, the drain pipe is communicated with the water outlet pipe, the inner cavity of the pot body comprises a temperature control sensor, a water outlet hole, a steam heating pipe, an upper spray pipe and a side spray pipe, and the upper spray pipe and the side spray pipe are communicated with the chief spray pipe. The steamer can be used for automatically and accurately controlling the temperature, pressure and time, guaranteeing the sterilizing quality through heating and cooling by gradient, and saving energy and water because the hot and cold spray water is used and stored reasonably.

The invention discloses a niobium oxide doped barium calcium zirconate titanate leadless piezoelectric ceramic powder material which is prepared through the following method comprising the steps of: weighting raw materials BaCO3, ZrO2, TiO2, CaCO3, MnO2 and Nb2O5 according to the stoichiometric ratio of elements in the chemical general formula: Ba0.85Ca0.15Ti0.895-xZr0.1Mn0.005NbxO3; carrying out ball milling on the raw materials for 10-16h by taking absolute ethyl alcohol as a medium, and drying the ball-milled slurry to obtain dry powder; and placing the dry powder into the air, and pre-sintering the dry powder at the temperature of 1100-1300 DEG C for 1-4h to obtain the niobium oxide doped barium calcium zirconate titanate leadless piezoelectric ceramic powder material. The Ba0.85Ca0.15Ti0.895-xZr0.1Mn0.005NbxO3 leadless piezoelectric ceramic with a perovskite type structure, which is obtained by using the traditional solid state sintering method and industrial raw materials, has more excellent performance. Shown by mass data statistics, the leadless piezoelectric ceramic prepared by using the niobium oxide doped barium calcium zirconate titanate leadless piezoelectric ceramic powder material disclosed by the invention has the piezoelectric constant d33 of 335pC/N, the electromechanical coupling factor kp of 39.5% and the dielectric loss of less than 2%. In addition, the niobium oxide doped barium calcium zirconate titanate leadless piezoelectric ceramic powder material is stable in preparation process and better in industrial prospect.

The invention relates to a quench bath composition and application thereof. The problems that due to the fact that the cooling speed of an existing quenching bath is too high, workpieces made of materials high in quenching degree are prone to deforming and cracking, the application range of the quenching bath is limited, and quenching oil with the high cost cannot be replaced are mainly solved. The quench bath composition is composed of, by weight, 45-70 parts of polyalkylene glycol, 2-30 parts of polyvinylpyrrolidone, 0.5-8 parts of antirust agent, 0.005-0.2 part of antifoaming agent, 0.1-5 parts of triethanolamine and 20-80 parts of water. According to the technical scheme, the problems are solved well, and the quench bath composition can be used for quenching of materials high in quenching degree or small and medium low-carbon steel.

The invention discloses a heating body with a heating mesh inlaid on the surface of porous ceramic and a preparation method thereof. The heating body comprises a ceramic substrate and the heating meshinlaid on the ceramic substrate, wherein the ceramic substrate is a ceramic body; the interior of the ceramic body has a porous structure; and the heating mesh is inlaid on the surface of the ceramicsubstrate. The preparation method for the heating body with the heating mesh inlaid on the surface of the porous ceramic comprises the following preparation steps: preparation of materials, i.e., preparation of a ceramic slurry and the heating mesh; hardening molding in a mold cavity; sintering of a green ceramic heating body; and baking of the green ceramic heating body. The heating body with the heating mesh inlaid on the surface of the porous ceramic and the preparation method thereof provided by the invention have the following advantages which are deficient for a conventional product during implementation: stable structure, fast heating speed, uniform temperature distribution, good use experience, insusceptibility to generating deformation and cracking for the heating mesh, long service life, good use economy, etc.

The invention provides anti-deformation wood drying equipment. The anti-deformation wood drying equipment comprises a drying furnace body, a heating device mounted in the drying furnace body, a mist spraying device and a ventilating device. The anti-deformation wood drying equipment is characterized in that a group of net plate supports are arranged in the drying furnace body; net plate pressing plates are arranged on each net plate support; the net plate pressing plates are connected together through connecting rods; the connecting rods are connected with hydraulic oil cylinders; and pressuresensors are arranged in the positions where the connecting rods are connected with the hydraulic oil cylinders. With the anti-deformation wood drying equipment, wood cracking, deformation and the like can be effectively prevented, and the drying effect is good.

The invention relates to the field of die-casting manufacture, in particular to a demolding mechanism, a demolding method and a die-casting device. The demolding mechanism comprises an ejector pin base plate and an ejector pin fixing plate, wherein the ejector pin base plate is connected with a die-casting machine ejector rod penetrating through a mold base plate, and the ejector pin fixing plate is connected with the ejector pin base plate and is provided with a first ejector pin and a second ejector pin in penetrating mode. The first ejector pin is in butt joint with the ejector pin base plate which is provided with an ejector pin ejector rod in butt joint with the second ejector pin. The ejector pin ejector rod comprises a first step located in a sink hole of the ejector pin base plate, the sink hole is provided with an ejecting face corresponding to a first step, a delay distance is reserved between the ejecting face and the first step, and the first step can move in the sink hole through the match between the ejector rod and the ejector pin base plate to enable the second ejector pin to be ejected out in delay mode. Therefore, the demolding mechanism, the demolding method and the die-casting device can achieve secondary ejection of a die-casting mold, the delay distance for the secondary ejection can be controlled accurately, and the defects of cracking, efficiency losing and ejection deformation of parts with deep cavities and thin walls can be effectively overcome.

The invention discloses a flame cutting process of a medium and high carbon steel plate, and belongs to the technical field of steel plate manufacturing. The process aims at ensuring the steel plate cutting face quality. A numerical control flame cutting machine is adopted, after a steel plate to be cut is placed on the numerical control flame cutting machine, the surface of the steel plate to becut is perpendicular to a cutting nozzle of the numerical control flame cutting machine, the cutting nozzle is perpendicular to the surface of the steel plate, the height between the cutting nozzle and the surface of the steel plate is 25 to 30 mm, according to the steel plate thickness value, cutting parameters are set, the right-angle position formed through the surface of the steel plate to becut and the side face serves as the cutting point, the flame strength of the cutting nozzle is adjusted, the length of secondary flames reaches the bottom of the steel plate to be cut, before cutting,preheating is carried out at the cutting point, after the set preheating time is achieved, cutting oxygen is opened, when slag to be melted flows downwards along the edge, the cutting nozzle is movedforwards, when the slag is discharged from the bottom, the moving speed of the cutting nozzle is increased to be normal, and after the steel plate is cut, stacking for slow-cooling or high-temperature tempering is carried out. The flame cutting process is used for cutting the medium and high carbon steel plate with the thickness of 50 to 250 mm.

The invention provides an integral autoclaved aerated concrete wallboard and a production process thereof and relates to the technical field of assembled building wallboards. The integral autoclaved aerated concrete wallboard comprises autoclaved aerated concrete boards, reinforced concrete side frames and steel pins or/and bolts. The integral autoclaved aerated concrete wallboard is characterized in that the autoclaved aerated concrete boards are spliced into a wallboard surface by virtue of a transverse mounting manner, a vertical mounting manner or a transverse-vertical mixed mounting manner; and when the autoclaved aerated concrete boards are spliced, each reinforcing rib is arranged at an interval of one or several autoclaved aerated concrete boards; and the reinforced concrete side frames are produced by concrete poured rebar mesh cages and are fixedly connected to the peripheries of the wallboard surface by virtue of the steel pins or/and the bolts (3). The integral autoclaved aerated concrete wallboard has the positive effects that the problems of cracking and leakage of a wall body can be fundamentally solved, the integral autoclaved aerated concrete wallboard can be hoisted once by virtue of a crane, the construction speed is high, the restriction of weather conditions is low, the labor is saved, the construction cycle can be effectively shortened, the construction cost can be saved, and the construction quality can be improved.

The invention discloses a cold-resistant, corrosion-resistant, flame-retardant and anti-interference double-sheath cable. The cable comprises an outer sheath, an anti-torsion layer, an inner sheath, awater-blocking filler and a cable core; the inner sheath is extruded on the outer side of the cable core, the anti-torsion layer is wrapped on the outer side of the inner sheath, and the outer sheathis extruded on the outer side of the anti-torsion layer; and the cable core comprises three wire cores, a tensile rope and a fixing rope. The inner sheath, the anti-torsion layer and the outer sheathare sequentially wrapped on the outer side of the cable core; double protection can be effectively performed on the cable; the cold resistance, moisture resistance and corrosion resistance of the cable are improved; the wire core can be effectively fixed and dragged through the fixing rope; the cable core is prevented from deforming and breaking due to mutual extrusion in the bending process, thefriction force between the cable core and the sheath can be effectively improved through the circularly wrapped fixing rope, the slippage between the cable core and the inner sheath is avoided, the generated stress is homogenized and eliminated through the ductility of the fixing rope, the cracking and deformation of the cable are avoided, and the service life of the cable is prolonged.

The invention discloses a wood modification working liquid used for wet plate processing and a use method thereof. The wood modification working liquid used for wet plate processing is prepared from, by weight, inorganic base resin, namely an alkaline silica solution with 2-30% of silicon dioxide by weight, organic base resin, namely water soluble urine aldehyde resin impregnation liquid with 2-30% by solid content, waterproof agents with 0.2-20% by solid content, 0.05-3% of silane coupling agents, 0.2-1% of emulsifying agents, 1-10% of fire-retardant preservative and the balance water through mixing. The wood modified working liquid adopts matching of the inorganic component and the organic component, so that wood has the functions of preventing corrosion and insects, retarding inflaming, being waterproof and the like. All the components are not polymerized by themselves and can meet production requirements; the combination capacity of the components with the wood is high; the leach resistance is high; the obtained modified wood is good in stability, high in waterproof performance and good in corrosion prevention and fire resistance.

Disclosed are a split stator and a manufacturing method thereof with which insulation reliability can be improved by preventing deformation or cracking of the insulator by eliminating slippage of the insulator at the coil end face. A slip prevention mechanism that prevents slippage of the insulator is provided at the coil end face, and using insert molding, the insulator is integrally molded to a split stator core provided with the slip prevention mechanism.

The invention relates to the technical field of aeronautical manufacturing, and in particular, provides a method for preventing deformation cracking of a laser deposition formed A-100 steel structure. The method comprises the following steps: (1) in the forming process of laser deposition formation of A-100 steel, each layer of laser deposition formed section is peripherally and uniformly zoned in the laser deposition forming growth direction; at least six subareas are provided; the laser scanning filling is performed on each subarea of the section according to a discrete forming mode; filling rules of each subarea are as follows: two adjacent subareas are not near on the filling sequence; and a filling path when filling any subarea is S-shaped; and (2) the stress relief annealing is performed on a part after formation within 24 h, and comprises the procedures of heating of the part to 190-450 DEG C for lasting by 2-4 h and air cooling or oil cooling to the room temperature. The method can effectively reduce generation of the heat stress of overall structure of the laser direct deposition formed A-100 steel.