摘要:
Providing an iron and steel material having quenched surface part, avoiding oxidation of a compound layer formed on the surface of the iron and steel material due to quenching, its production method, and an induction-quenched component. A quenched iron and steel material 10 comprises an iron and steel material 11, a compound layer 12 formed on the iron and steel material 11, and an antioxidant cover layer 13 formed on the compound layer 12. The iron and steel material 11 has a hardened layer having a given depth, and the surface of the iron and steel material 11 has enhanced hardness. A method for producing the iron and steel material 10 comprises a first step for forming the antioxidant cover layer 13 to cover the compound layer 12 formed on the iron and steel material 11, and a second step for applying induction hardening to the iron and steel material 11 having the compound layer 12 and the antioxidant cover layer 13, with the temperature increased in a given heating time until the given heating temperature is reached, and with cooling immediately performed once the heating temperature is reached.
摘要:
Ultradispersed ones of primary particles of nanometer-sized carbon are obtained by applying a wet-type milling method and/or a wet dispersion method to an aggregate structure of the primary particles to overcome van der Waals forces, by which forces the primary particles are held together to form the aggregate structure, whereby the ultradispersed primary particles are obtained in a colloidal dispersion on a large-scale basis at low cost without using any additive. In a method of manufacturing the ultradispersed primary particles, the wet-type milling method is carried out in a ball mill, preferably in combination with a high-energy ultrasonic-wave process carried out in a dispersing medium such as pure water, whereby a colloidal solution or slurry with a low-concentration of the primary particles ultradispersed in the dispersing medium is obtained.
摘要:
A welding equipment for metallic materials capable of performing heat treatment such as tempering based on partial heating in spot welding is provided. The welding equipment sandwiches metallic materials with a pair of electrodes, and heats different regions of the metallic materials by energization, with the pair of electrodes maintained at the same position with respect to the metallic materials. The welding equipment includes a first heating means connected to the pair of electrodes for heating and welding the internal region of the circle defined by projecting the cross-sectional area of the axis of the electrodes on the metallic materials by applying power having a low first frequency, a second heating means for heating a ring-shaped region along the circle by applying power having a second frequency that is higher than the first frequency, and an energization control unit for independently controlling the first and the second heating means.
摘要:
A welding equipment for metallic materials capable of performing heat treatment such as tempering based on partial heating in spot welding is provided. The welding equipment 1 sandwiches metallic materials 9 with a pair of electrodes 4, 4, and heats different regions of the metallic materials 9 by energization, with the pair of electrodes 4, 4 maintained at the same position with respect to the metallic materials 9. The welding equipment includes a first heating means 6 connected to the pair of electrodes 4, 4 for heating and welding the internal region of the circle defined by projecting the cross-sectional area of the axis of the electrodes on the metallic materials by applying power having a low first frequency, a second heating means 8 for heating a ring-shaped region along the circle by applying power having a second frequency that is higher than the first frequency, and an energization control unit 10 for independently controlling the first and the second heating means 6, 8.
摘要:
A high-strength die-quenched part 1 is formed by heating a high-strength steel sheet 11 up to an austenite region, hot stamping and cooling inside a mold, and its microstructure has the martensite wherein carbide particles 2 are finely dispersed over an entire region including prior-austenite grain boundaries. It is desirable that the prior-austenite grain size in the microstructure of the high-strength steel sheet, which is a base material, be 10 μm or smaller. The high-strength die-quenched part has high-strength and high-ductility thanks to its martensite.
摘要:
A welding equipment for metallic materials capable of performing heat treatment such as tempering based on partial heating in spot welding is provided. The welding equipment 1 sandwiches metallic materials 9 with a pair of electrodes 4, 4, and heats different regions of the metallic materials 9 by energization, with the pair of electrodes 4, 4 maintained at the same position with respect to the metallic materials 9. The welding equipment includes a first heating means 6 connected to the pair of electrodes 4, 4 for heating and welding the internal region of the circle defined by projecting the cross-sectional area of the axis of the electrodes on the metallic materials by applying power having a low first frequency, a second heating means 8 for heating a ring-shaped region along the circle by applying power having a second frequency that is higher than the first frequency, and an energization control unit 10 for independently controlling the first and the second heating means 6, 8.
摘要:
An objective of the present invention is to provide the latest medical treatment to a medical institution or a clinic in a remote/underpopulated area which is likely to lag behind the progress in the medical technology, which reduces economic burden on a terminal medical institution or a patient and establishes easier access for the patient to receive a close examination or diagnosis in the nearby medical institution, so that reducing labor or equipment burden on a specific latest medical institution or an expert while ensuring the accuracy in the diagnosis and examination. As a solving means thereof, the most-advanced diagnosis and examination are provided for the patient by arranging terminal equipments of essential diagnostic examination instruments in a plurality of the terminal medical institutions, such as the clinic in the remote/underpopulated area, performing diagnosis and examination of the patient by the terminal equipments at the terminal medical institution, transmitting diagnosis and examination data of the terminal equipment to a complete medical institution with specialized staff via a communication network, analyzing and processing the data at the complete medical institution, and transmitting the processed result to the terminal medical institution via the communication network.
摘要:
A helmet principally for use with motorcycles and the like having vent openings on the front thereof. The vent openings are positioned within ram cavities formed between the visor and adjacent guide plates. Passageways extend through attachment mechanisms holding the visor to the helmet. Channels extend through the helmet liner to enhance air flow therethrough. Air ducts may be employed within the channels, providing additional energy absorbing properties to the helmet. Air flow may be further increased by means of a channel extension extending rearwardly from the helmet to advantageously arrange the outlets for maximum flow. An adjustable visor having a transparent visor extension enables selected extension and retraction of the visor to meet road and weather conditions.
摘要:
High-strength, high-workability steel for cold plastic working, obtained by subjecting a hardenable carbon steel to rapid high-frequency induction heating, quenching it, rapidly heating it by high-frequency induction to a temperature of 300.degree.-600.degree. C., and rapidly cooling it. This steel can be cold plastic worked, and then reheated at 300.degree.-500.degree. C. for 30-60 minutes, to obtain a steel having a high elastic limit.
摘要:
High-strength, high-workability steel for cold plastic working, obtained by subjecting a hardenable carbon steel to rapid high-frequency induction heating, quenching it, rapidly heating it by high-frequency induction to a temperature of 300.degree.-600.degree. C., and rapidly cooling it. This steel can be cold plastic worked, and then reheated at 300.degree.-500.degree. C. for 30-60 minutes, to obtain a steel having a high elastic limit.