1691results about How to "Improve roundness" patented technology

An elongated composite tube made up of an inner tube 42 and an outer tube 44 (FIG. 3) with a plurality of elongated helical ribs disposed between the inner tube and the outer tube in a supporting relationship to both. A slinky like toy made from the composite tube is also disclosed, as is a method of making both.

The invention provides a low-damage processing method of film holes in a single crystal high-pressure-turbine hollow blade of an aircraft engine. The low-damage processing method comprises the following steps: wiping the surface of the blade through degreasing cotton with absolute alcohol; transferring into a drying box to dry; arranging a clamp on a machine table, and aligning; assembling the dried blade on the clamp and locking; presetting scanning system parameters; scanning the blade; saving axis moving coordinate value of each hole to be processed under an automatically-generated machine coordinate system as a *.xls file; importing and generating a hole position file; performing compensative correction on the deviation value of a focus position of the hole to be processed; and setting the optimized laser processing technological parameters through a main processing interface. With the adoption of the low-damage processing method, the processed hole is outstanding in quality; a remelting layer, microcacks and recrystallization can be avoided after the single crystal material is processed, so that subsequent processing can be saved, and as a result, the fatigue life and the processing cycle of the blade can be prolonged and improved; the ablation threshold of the single crystal material can be effectively reduced; the recrystallization of the single crystal material can be avoided.

The invention discloses high-strength nodular cast iron QT900-6 which consists of the following elements in percentage by weight: 3.2-3.7% of C, 2.4-2.8% of Si, less than or equal to 0.2% of Mn, less than or equal to 0.03% of P, 0.005-0.02% of S, 0.8-1.4% of Cu and the balance of Fe and unavoidable trace elements. The high-strength nodular cast iron QT900-6 has high compressive strength, high yield strength and excellent mechanical property.

The invention discloses a polylactic acid toughened material for 3D printing, which comprises polylactic acid and the following components in percentage by mass (on the basis of polylactic acid): 5-25% of toughener, 0.5-2.0% of lubricant, 0.5-2.0% of oxidized polyethylene wax, 0.3-1.0% of white oil, 5-25% of low-melting-point resin-coated inorganic powder and 0.3-0.9% of antioxidant. The material prepared by the technical scheme has the advantages of favorable toughness, high extrusion forming regularity and favorable line roundness. The printing proves that the product has the advantages of low shrinkage, no edge lifting, no cracking, high cooling speed and favorable appearance and has wide printing application range.

The ball forming mechanism of ball rolling machine for rolling metal rod, especially copper rod, into ball in the required size includes one frame, one pair of rotating drum seats in the lower part of the frame, one pair of rotating drums, one pair of ball forming rollers matching the rotating drums and with spindle set via two bearing seats on the frame. The ball forming process has high efficiency and no material loss, and the formed ball has high sphericity, smooth surface and high density.

The invention relates to nodular cast iron and a centrifugal composite casting roller. The nodular cast iron comprises, by weight, 3.0-3.4% of C, 2.2-2.4% of Si, Mn being less than 0.4, P being less than 0.05, S being less than 0.015, 0.85-0.95% of Ni, 0.3-0.5% of Cu, 0.2-0.3% of Mo, 0.015-0.020% of Sb, 0.01-0.03% of RE, 0.03-0.06% of Mg, and the balance being Fe and impurity elements. Concrete steps comprise: firstly melting base iron, using a cerium-based light RE-Mg nodulizer and an Mg-Ni alloy nodulizer for spheroidising by pouring process; using a long-acting inoculant containing barium and calcium elements for stream inoculation during the casting process while the casting temperature of nodular cast iron is 1430-1450 DEG C, and realizing metallurgy melting with centrifugal casting high chromium cast steel to form a roll core part and a roll neck. According to the obtained roll neck, the nodular cast iron tensile strength is greater than or equal to 550MPa, graphite nodularity reaches 2-3 level, hardness number is HSD35-45, and there is no macroscopic grey spots and bright spots. In addition, the invention also provides the high chromium cast steel centrifugal composite casting roller with the above nodular cast iron as the core part.

The invention provides natural bamboo fiber shirt fabric which has silky gloss, good feel and drapability, and is rich in graceful feeling, antibiosis, moisture-adsorption and ventilating. Warps and wefts of the fabric are both natural fiber/bamboo viscose blended yarns, the blending ratio of the warps and the wefts is 1:1, the warp density is 512/10cm, and the weft density is 338.5/10cm. A manufacture method of the natural bamboo fiber shirt fabric comprises the following steps: a, blending: opening picking, carding cotton, drawing out, roving and spun yarn; b, drum yarn dying: tube loosening, pretreatment, dying, dehydration and drying, wherein the pretreatment comprises bleaching and enzyme treatment; during bleaching: soda ash is 1-3g/L, hydrogen peroxide is 1-2g/L, the temperature is 95 DEG C, the time is 35-45min; and during the enzyme treatment, HontonezymePA is 1-1.5g/L, pH value is 4.5-5.5, the bath ratio is 1:15, and the time is 25-35min; and during dying, the drum yarn density is 0.33-0.35g/cm<3>, and MegafixB type reactive dying is adopted; c, weaving: winding, warp pulp connection, drawing in or warp tying and weaving; and d, after treatment: singeing, desizing, sizing and preshrinking.

The invention discloses a production method of an ultra-large-diameter thin-walled pressure-resistant aluminum alloy pipe. The production method comprises the steps: (1) feeding, (2) winding or rolling of a reel, (3) performing stirring friction welding, (4) performing solid solution quenching, (5) reshaping, (6) performing aging treatment, and (7) performing pressure resistance test. The aluminum alloy pipe produced by using the method is high in welding seam strength, high in welding seam consistency, high in pipeline roundness and high in internal pipe pressure resistance. According to each series of typical alloys subjected to the method and the process, the minimum yield strength of a pipe welding seam and the allowable internal pipe pressure resistance (applicable to gas and liquid) are as follows: (1) if the alloy is 2XXX, sigma <0.2> is greater than or equal to 290 Mpa, and P (internal pressure) is greater than or equal to 15 Mpa; (2) if the alloy is 6XXX, sigma<0.2> is greater than or equal to 200 Mpa, and P (internal pressure) is greater than or equal to 10 Mpa; (3) if the alloy is 7XXX, sigma<0.2> is greater than or equal to 395 Mpa, and P (internal pressure) is greater than or equal to 20 Mpa.

A wrench manufacturing process for manufacturing a rotational-tube wrench comprises the steps of forging, annealing, rolling, punching, drawing, polishing, surface grinding, CNC rough cutting, thermal treatment, vibrating, electroplating, CNC fine cutting and assembling. The additional steps of thermal treatment and CNC or MC fine cutting not only enhance the structural toughness of the wrench but also guarantee high degree of roundness for the receptacle space thereof. The CNC or MC fine cutting also provides the inner wall of the receptacle space with fine tool marks so that the confinement strength of a rotational tube without ratchets therein can be significantly enlarged.

A rolling bearing adapted to prevent crack formation in a caulking portion is provided. A rolling bearing assembly includes: a hub shaft having the caulking portion at an axial end thereof, the caulking portion bendably deformed in a radially outward direction; the rolling bearing mounted on an outside surface of the hub shaft; and an annular member spline-engaged with the hub shaft and caulk-fixed to place by the caulking portion. An inner-side axial end of a second male spline formed on the hub shaft is shifted from an inner-side end of the hub shaft toward an outer side far enough to ensure that the second male spline is not susceptible to the plastic deformation of the caulked caulking portion.

The invention discloses a manufacturing method of an X65 pipeline steel longitudinal submerged arc welded pipe for undersea use. The manufacturing process of the steel pipe comprises: edge milling, edge prebending, JCO moulding, prewelding, inside welding, outside welding, first ultrasonic inspection, first x-ray inspection, mechanical expanding, hydrostatic test, chamfering, groove machining, second ultrasonic inspection, second x-ray inspection, pipe end magnetic particle inspection and appearance quality inspection. The method of the invention makes each part of the X65 steel grade ongitudinal submerged arc welded pipe with a diameter of phi 762mm and wall thickness of 28.6-30.2mm has uniform deformation and performances in the process of JCO moulding; the method in the invention solves the problem that local heating of the steel pipe during welding results in severely reduced strength and toughness as well as elongation; the method provided in the invention also provides a solution to the problems of increased strength and reduced toughness and uniform elongation caused by work hardening during steel pipe mechanical expanding.

The invention relates to a continuous fiber reinforced thermoplastic resin melt impregnation 3D printing device and a method, wherein thermoplastic resin is used as a matrix, and continuous glass fiber or carbon fiber is used as a reinforcement. The 3D printing device comprises an extruder, an unwinding roller, a pre-tensioning roller, an infrared radiation device, a gas-assisted swinging device,a wire wetting mold, a cooling device and a 3D printer. A continuous fiber bundle is firstly pre-dispersed by the pre-tensioning roller, the upper surface and the lower surface of the continuous fiberare pre-heated by the infrared radiation device, the pre-heated continuous fiber is unfolded to a certain width under the action of the gas-assisted swinging device, then the pre-heated continuous fiber enters the wire wetting mold, the wetting process of the resin matrix on the fiber bundle is completed under the action of a wave-shaped runner, the fiber bundle is conveyed forwards by the traction of an inner traction roller and passes through a circular shaping die to form continuous fiber prepreg filaments which can be used for 3D printing, and cooling, feeding and printing are carried outto finally obtain the 3D printed product of the continuous fiber reinforced thermoplastic composite material. According to the device and the method, uniform dispersion and full impregnation of the continuous fiber in the resin matrix can be realized, the 3D printing continuous fiber reinforced thermoplastic composite material product with good interface bonding and excellent performance can be prepared, and meanwhile real-time integrated forming of continuous fiber consumables and the 3D printing composite material product can be realized.

The invention discloses a manufacturing method for X90 pipeline steel longitudinal submerged arc welding pipe, the mass percent of the X90 pipeline steel consisting of: C 0.04-0.08%, Mn1.60-2.0%, Si 0.15-0.45%, S<=0.006%, P<=0.010%, Ni 0.20-0.50%, Mo 0.10-0.30%, Ti 0.010-0.020%, Al 0.015-0.050%, Nb 0.05-0.10%, V<= 0.05%, N <= 0.01%, Cu 0.10-0.30%, Cr <= 0.35%, B <= 0.004%, the rest is Fe, wherein Ceq <= 0.50, Pcm<= 0.25; the inside welding and outside welding adopt 4-wire submerged arc automatic welding. The welding pipe of the invention has advantages of tenacious welding joints and uniform performance.

The present invention relates to a novel, dual purpose binder formulation or system. The invention also relates to a process of agglomerating dispersed particles or fines into substantially spherical and crush resistant granules. The invention further relates to a method of covering a seed and binding the seed with a material mixture beneficial for seed germination. The invention also relates to an all-in-one seed agglomerated by the dual purpose binder formulation.

The invention discloses cigarette aroma enhancement humectant 1-L-leucine-1-deoxidation-D-fructose. The structural formula of the cigarette aroma enhancement humectant 1-L-leucine-1-deoxidation-D-fructose is as follows. The invention further discloses a preparation method of the compound. D-mannose is taken as a raw material, and the cigarette aroma enhancement humectant 1-L-leucine-1-deoxidation-D-fructose is successfully synthesized through simple reaction processing. Physical humectant performance tests and inherent sensory quality evaluations show that the humectant has a good physical humectant effect on cigarettes, and can reduce irritation and blended gases of the cigarettes and improve the smoke mellow sense and comfort of the cigarettes.

The invention relates to a preparation method of a scallop seasoning essence, which comprises the following steps of: crushing cleaned scallop aprons, and carrying out blanching denaturation; carrying out enzymolysis, enzyme destruction, concentration, drying and pulverization to obtain scallop apron hydrolysate; adding auxiliary materials comprising HVP(Hydrolyzed Vegetable Protein) powder, yeast extract, L-sulfo-aminolactic acid, xylose, glycine, aminopropionic acid, L-phenylalanine, DL-methionine, salts, purified water, vitamins, glucose, thiamine chloride VB1, I+G, maize starch, onion powder and ginger powder to the scallop apron hydrolysate, carrying out Maillard heat reaction for 40-60 min at 100-125 DEG C; and carrying out cooling, vacuum drying, pulverization, granulation and packaging to obtain the scallop seasoning essence as a finished product. The scallop seasoning essence has delicious and pure taste, pure and thick mouth feel and strong sweet smell, is endowed with the peculiar seafood flavor of scallop and has the characteristics of natural raw materials and various nutrient substances comprising amino acid, peptides and the like. The preparation method has the advantages of reasonable process, convenience for operation, strong operability and easiness of realizing industrial production.