30results about How to "Sufficient bending strength" patented technology

The invention discloses an ultra-high molding door, and relates to the field of molding doors. The ultra-high molding door comprises a door panel, a first face plate and a second face plate, wherein areserved gap is formed by the first face plate and the second face plate in a surrounding manner; a reinforcing assembly is arranged in the reserved gap; the reinforcing assembly comprises two reinforcing plates and a reinforcing rack; the cross section of the reinforcing rack is H-shaped; inner grooves are formed in the two sides of the reinforcing rack in the width direction; the two reinforcing plates are arranged in parallel at intervals; the two reinforcing plates are separately fixedly embedded in the two inner grooves; a through groove is horizontally formed in the reinforcing rack ina penetrating manner; the two reinforcing plates are adhered and fixed through a fireproof sealant; cambered plates are separately arranged on the outer sides of the two inner grooves; an accommodating cavity is formed by the cambered plates and the reinforcing plates in a surrounding manner; and compressed rubber is fixed in the accommodating cavity. The ultra-high molding door is good in attractiveness, long in service life, good in fireproof performance and high in safety, and is environmentally friendly.

The invention discloses a metal mold and a manufacturing method thereof and a metal mold casting apparatus. The metal mold is arranged on the metal mold casting apparatus and comprises a first half mold and a second half mold which are processed from low-carbon structural steel with a uniform metallic structure. The first half mold and the second half mold are respectively provided with, in correspondence, a cavity used for formation of the shape of a casting during casting, a cast gate, a runner, fixed supporting feet which can be fixedly connected to the metal mold casting apparatus and joint surfaces which fit each other during closing of the first half mold and the second half mold, wherein the cavity is a concave cavity matching with the shape of the external surface of the casting and accommodates a sand core used for defining the interior surface shape and wall thickness of the casting, and a positioning part used for positioning the relative position between the sand core and the cavity is arranged above the cavity. The metal mold prepared by using the manufacturing method provided by the invention can shorten casting time, realizes rapid filling and formation and improves yield.

The invention relates to a method for preparing a 3D-SiC / Al composite material with a three-dimensional interpenetrating structure, including the preparation of a 3D-SiC prefabricated part and the subsequent preparation of the 3D-SiC / Al composite material by pressureless infiltration. Among them, when the 3D-SiC preform is applied to the subsequent pressureless infiltration of the 3D-SiC / A composite material, it may or may not be pre-oxidized according to the composition of the aluminum alloy used. The SiC content in the composite material of the present invention is 50-73vol%, the density of the composite material can reach 2.90-3.1g / cm2, the thermal conductivity can reach 232W / (m·℃), and the thermal expansion coefficient can be as low as 5.72×10-6 / ℃ , the bending strength can reach 330MPa, and the comprehensive performance meets the technical performance requirements such as low expansion coefficient, high thermal conductivity and sufficient bending strength that electronic packaging materials must have.

Provided is a back pressure control valve assembly of a diesel engine. The assembly is of a unit combination structure and comprises a driving unit A, a transmission unit B and an action unit C; and one end of a body of a cylinder of the driving unit A is hermetically, fixedly and integrally connected with a side of a transmission shell of the transmission unit B by seam allowance, the bottom of the transmission shell of the transmission unit B is hermetically, fixedly and integrally connected with the top of a valve of the action unit C by seam allowance, and the driving unit A drives the action unit C to twist via the transmission unit B so as to close or open an airflow channel of the valve. The back pressure control valve assembly has the advantages that the unit combination modular structure for specific requirements and technological parameters of WEVB (Weichai exhaust valve brake) is adopted, the standardization level is high, particularly, working media of the cylinder are not polluted or interfered by environments, accordingly, the back pressure can be accurately, stably and reliably controlled, and the back pressure control valve assembly is long in service life.