摘要:
In a method of hot brazing aluminum articles, the steps of: interposing an amount of a flux-containing brazing agent (12) between portions of aluminum articles (11, 11) which are to be adjoined one to another; gripping the portions with a pair of heaters (13); and then activating the heater so that heat conducted therefrom melts the brazing agent (12) to braze the aluminum articles (11), are carried out in this order. The brazing agent (12) is a compacted agent composed of a matrix powder and a flux powder, at a ratio in weight of 99.9:0.1 to 70:30, and the agent has a density corresponding to 90% or more of a theoretical value. The articles (11) may be pressed one to another towards adjoining surfaces while they are being heated by the heater (13), or the heaters (13) are slided relative to the adjoining portions so that they are heated wholly, or the adjoining articles (11, 11) are urged towards each other while the heaters (13) are being slided relative to them so as to entirely heat them, so that the brazing is carried out efficiently to manufacture brazed products which are of a higher brazing strength.
摘要:
A process for producing a heat pipe including the steps of treating the inner surface of a steel container with an aqueous solution of a vanadate with heating, and enclosing in the container a working liquid prepared by adding an alkalinizing pH adjusting agent to pure water and having an adjusted pH of 8 to 12. When the container inner surface is treated with the aqueous vanadate solution with heating, a protective layer covering the inner surface is formed. The working liquid, when in the range of 8 to 12 in pH, maintains the protective layer in a stable state over a prolonged period of time.
摘要:
During a process of cooling a hypereutectic Al—Si alloy melt, ultrasonic vibration is applied to the melt to crystallize primary crystal α-Al using, in combination, an ultrasonic transducer (8) that generates the ultrasonic vibration, an ultrasonic horn (7) that is connected to the ultrasonic transducer (8) and transmits the ultrasonic vibration in a specified direction, a treatment vessel (2) that holds the melt and is in contact with the ultrasonic horn (7), and a treatment vessel fixing device (3) that fixes the treatment vessel (2) by pressing the treatment vessel toward the ultrasonic horn (7).
摘要:
A method of treating a surface of a mold that includes supplying a fullerene into an amorphous carbon layer that covers the surface of the mold and heating the amorphous carbon layer to at least 400° C. while covering a surface of the amorphous carbon layer with a covering member.
摘要:
A method for rust-proofing a mold, which is capable of reducing the time and the cost required for rust-proofing the mold. The method includes an iron hydroxide-forming step for forming iron hydroxide on a predetermined part of the surface of the mold, and a surface-treating step for forming a film covering the molding surface of the mold, and for changing the iron hydroxide formed on the mold into black rust, by heating the mold, under an oxygen-deficiency atmosphere, on which the iron hydroxide is formed in the iron hydroxide-forming step.
摘要:
Disclosed are a film with high strength which does not easily deteriorate, and a method for manufacturing the film. A step for manufacturing a film formed on the molding surface of a die, includes an initial film-forming step for forming, on the molding surface of the die, an initial film having a carbon film which has a plurality of nano-carbons, and to which a plurality of fullerenes are applied, and a nitrogen compound layer and a sulfurized layer which are situated between the carbon film and the die, and an intermittent heating step for intermittently heating the initial film formed in the initial film-forming step under a non-oxidizing atmosphere.
摘要:
A technique for an infrared radiation thermometer used for thermography detects measurement abnormality of the infrared radiation thermometer and estimates the causes of the measurement abnormality such as contamination of an objective lens and a malfunction in a mechanism section of the infrared radiation thermometer. The measurement abnormality detector has a dummy lens 21 placed in the periphery of the objective lens 11 of the thermometer 10 so as to be at a position and in an attitude that are more susceptible to contamination than the objective lens 11, a laser displacement meter 22 for projecting light to the dummy lens 21 at each predetermined time or at a predetermined timing, receiving the light reflected by the dummy lens 21, and measuring the quantity of the received light, and determination means 50 for calculating the attenuation rate of the projected light on the basis of the quantity of the received light measured by the laser displacement meter 22, estimating the degree of contamination of the dummy lens 21 on the basis of the calculated attenuation rate, and judging, on the basis of the degree of contamination of the dummy lens 21, the necessity of warning for contamination of the objective lens 11 and measurement abnormality of the thermometer 10.
摘要:
A die-casting die is provided. The die-casting die may include a cavity forming surface. A part of the cavity forming surface may be coated with a surface treatment layer. The surface treatment layer may include a mixture of fibrous carbon and particle carbon and have a thermal conductivity that increases in connection to an increase in an acted pressure.
摘要:
A mold includes: a base; and a contact surface which is provided on the base and which comes into contact with a molten material. The contact surface is provided with a first surface portion that includes a first fiber layer in which first carbon fibers are raised, and a second surface portion having different surface characteristics from the first surface portion.
摘要:
In a forming mold equipped with a cooling channel for circulation of a refrigerant composed of a cooling gas and a atomized cooling liquid, any increase of back pressure attributed to evaporation of the refrigerant fed to the cooling channel is inhibited to thereby attain cooling acceleration, and further any occurrence of rust or scale by the refrigerant circulated through the cooling channel is prevented. Accordingly, a channel for supply of the refrigerant to the cooling channel of the forming mold is provided with air pressure source for trapping of air in the supply channel and pressure feeding of the same; oxygen separation means for separation removal of oxygen from the pressure fed air to thereby lower the oxygen concentration of the air; and atomizing means for spraying of the cooling liquid into the air with oxygen concentration lowered. The oxygen separated from the air by the oxygen separation means is returned to the refrigerant forcedly emitted from the cooling channel by means of forced exhaust means.