43results about How to "Does not affect dimensional accuracy" patented technology

The invention relates to the technical field of casting of ingots, and provides a round ingot die. The round ingot die comprises a die body, a lug and an insulation board; an inner cavity is formed in the die body; the cross section of the outer side surface of the die body is polygonal wave shaped. According to the round ingot die, the radiating area of the side surface of the ingot is increased; hot melt at the outermost layer can be quickly cooled to form a chilling layer; the thickness increase of the chilling layer is sped up; therefore, static pressure in pouring of hot melt can be borne; crack can be prevented; the difficulty at pouring of the round ingot can be greatly reduced; meanwhile, the size precision of the outer side surface of the round ingot die cannot influence the size precision of the round ingot, so that the requirement on the processing precision of the outer side surface of the round ingot die is reduced, the process and working houses are decreased, and the cost can be saved. The invention further provides a round ingot manufacturing method. The method is that the degree of superheat of hot melt is 40 to 55 DEG C; the linear speed of pouring of an ingot body is 80 to 220mm / min; the linear speed of filling and pouring of a dead head of the insulation board is 35 to 90mm / min. The method can properly reduce the casting temperature and speed; the round ingot can be quickly radiated; therefore, the surface cracks can be decreased.

The invention discloses a preparation process of an alloy mold core for high-temperature alloy monocrystal blade precision casting. Raw materials of the alloy mold core comprise metal powder and nonmetal powder; the metal powder is mainly prepared from cast iron fibers, tungsten powder, nickel powder, molybdenum powder and manganese sulfide powder in a mixed manner; and the nonmetal powder is mainly prepared from graphite powder, imine, polyethylene glycol, polyvinyl alcohol and ethylene bis stearamide in a mixed manner. The preparation process of the alloy mold core includes the following steps that the metal powder and the nonmetal powder are mixed in the proportion of 5:2; then the mixed powder is thrown into an acetone solution; an acetone solvent is removed in a heating manner; heating continues till 130 DEG C, and the mixture is fed into a mold to be pressed and formed; next, a machined mold blank is placed into a vacuum furnace to be subjected to degreasing, and sintering and forming are performed through hot pressing; and finally, the formed product is placed in a numerical control electrolytic machine tool to be subjected to precise electrolytic machining, and the alloy mold core is acquired. The alloy mold core acquired through the method is high in percent of pass of finished products, and the product is resistant to high temperature.

The invention relates to a method for precisely controlling the thickness of an electroless plating layer and a preparation method for a wear-resistant screen, belonging to the field of electroless plating. The method for accurately controlling the thickness of the electroless plating layer of the present invention accurately measures and calculates the plating speed and controls the plating time by establishing a mathematical model and performing iterative calculation on parameters such as the concentration of reactants in the plating process. The method realizes the use of computer programs to control the electroless plating process, establishes the mathematical model of the plating speed and the remaining time of plating by detecting the reactant concentration, pH value, temperature and other parameters that affect the chemical plating process, and uses the iterative calculation principle to accurately calculate the plating Speed, precise control of plating time, so as to achieve the purpose of precise control of coating thickness. The method can control the thickness error of the electroless plating layer within the range of ±0.0002mm, and significantly improves the manufacturing precision of the electroless plating product.

The invention discloses a complex for magnesium alloy surface activation. The complex comprises inorganic acid, organic phosphonic acid, surfactant and oxidizer, and is characterized in that: the complex also comprises organic carboxylic acid and corrosion-inhibition agent. The complex for magnesium alloy surface activation provided by the invention can ensure that the residue on the surface of the magnesium alloy is completely cleaned; at the same time, the complex can not cause remarkable corrosion effect to the magnesium alloy, has more lasting activation effect; the activated magnesium alloy has smooth and luminant surface, and has no influence on the size accuracy of workpieces. And the complex provided by the invention does not contain the substances harmful to the human body and the environment such as Cr, F and so on, and has no pollution to the human body and the environment.

The invention relates to a foam pattern surface film forming method for lost foam casting, belonging to a lost foam casting method, and solving the problems that the film forming matter of the current foam pattern surface film forming method has longer film forming time and high cost. The method of the invention comprises the following steps: (1) a film forming matter preparing step: preparing a wax-based organic composite material of which the raw materials in mass percent are as follows: 60%-100% of wax, 0%-40% of stearic acid and 0%-10% of additives, wherein the range of melting point of the wax-based organic composite material is 40 DEG C-70 DEG C, and then heating to meld the composite material to form mixture; and (2) a film forming step: completely soaking the foam pattern into themixture and soaking for 5-60s, and then taking out and slightly shaking or whipping to remove the excess liquid mixture, and after cooling, an even film layer is formed on the foam pattern. The invention has simple operation, short film forming time and lower cost, and can greatly improve the surface quality of the foam pattern, thereby improving the surface qualities of a mold shell and casting,and realizing large-scale industrial production.

The present invention discloses one kind of physical and chemical method to lower the surface roughness of stereo optically cured body. The method includes the following steps: compounding resin paint through adding surfactant not more than 0.1 %, active diluent in 5-30 % and leveling agent not more than 1 % into resin and regulating the viscosity of the resin paint to 0.25-0.70 Pa.S; and coatingthe resin paint to the surface of the body to form homogeneous coating of thickness within 300 micron, so as to reduce the roughness from 6-15 micron to 3 micron. The method can eliminate the step effect of stereo optically curing, and has excellent application foreground.

The invention discloses a roughness-controllable polishing method for stereolithographic resin prototype models. According to the invention, the fluid of a prepared chemical etching abrasive particle flow is used on abrasive particle flow equipment for respective polishing of the stereolithographic resin prototype models; then distilled water or deionized water is used for cleaning, surface roughness of the obtained stereolithographic resin prototype models is reduced to Ra 0.8 to 2 mu m from original Ra 8.0 to 20.0 mu m, surface roughness is uniform, texture is regular, postprocessing of the stereolithographic resin prototype models is realized, operation is simple, and labor intensity is reduced. The polishing method eliminates step effects of the stereolithographic resin prototype models, improves surface precision of the resin prototype models and does not influence dimensional precision of the resin prototype models.

The invention discloses a laser cutting and collecting mechanism for automobile interior decoration, which includes a laser, a cutting jig, a special reclaimer and a waste gas collection device connected with the cutting jig, including two sets of cutting jigs, a left cutting jig and a right cutting jig. The fixture is the left station and the right station. The cutting fixture is set on the fixture base (18) through the slide rail (17). The slide rail (17) is provided with a slide rail motor (16) to realize the cutting fixture Sliding on the track realizes the seamless connection of the jig and the waste collection bucket (1). The invention realizes the application of laser cutting in the cutting of PC+ABS plastic products, and solves the problem that the laser is difficult to cut plastic products. The area is significantly smaller, and the amount of cutting smoke and dust is significantly reduced; the developed jig is convenient for product fixing; the accuracy is improved: the product processing accuracy is very good, and the error of the product is + / ‑0.03mm.