31results about How to "Reliable cracking" patented technology

The present invention provides high precision machining of thin-walled aluminum alloy cover breaking with groove, with cracks forming method can reliably explosion mechanism battery case cover and the cover of the battery case explosion valve. The battery case made of aluminum alloy as the explosion-proof valve cover (2), embossing processing using more thin-walled breaking disposed recesses (4) shaped in a thin flat recess (3) while using the coining provided further than breaking recess (4) for assisting a thin thickness but breaking recess (4) forming a groove (5) than the flat-shaped recess (3).

The invention relates to a permanent waterproof layer of a building roof. The invention adopts ultra-high-performance concrete, and the integral roof waterproof layer is laid in one or more pouring constructions. The obtained waterproof layer body and seams have reliable functions of anti-crack, anti-seepage, waterproof and thermal insulation layer protection, and can simultaneously improve the strength and rigidity of the roof structure. The waterproof layer is durable and long-lasting, and the working life is the same as that of the building. The construction joint bonding joint and strengthening method of the invention can ensure the crack resistance, seepage resistance and waterproof performance of the joint interface. The permanent waterproof layer of the present invention has relatively simple laying and construction, and is suitable for waterproofing and maintenance of new building roofs and old building roofs of different structures, especially for flat roofs with relatively high loads such as planting, water storage, and parking. The waterproof layer of the cement-based composite material with both toughness and rigidity has no aging problem, and the waterproof and seepage-proof reliability of construction joints is high, which can permanently solve the problem of easy leakage of building roofs.

A shunt resistance type current sensor includes a bus bar, a circuit board disposed to oppose the bus bar, a shunt resistance part in the bus bar, connection terminals which electrically connect the bus bar and the circuit board, and a voltage detector which is mounted on the circuit board and detects a voltage applied to the bus bar to detect a magnitude of current to be measured flowing through the bus bar. The connection terminal is formed integrally with the bus bar as an extending piece extended from an edge part of the bus bar, an area of the connection terminal reduced in its plate thickness than that of the bus bar is set in a range from a tip side thereof, and the tip side of the connection terminal penetrates the circuit board and connects with the circuit board.

A practice golf ball has a core and a cover. The core is made of a rubber composition which includes a base rubber, a co-crosslinking agent, a crosslinking initiator and a metal oxide. The base rubber is a mixture of polybutadiene with styrene-butadiene rubber and/or isoprene rubber, and the co-crosslinking agent is methacrylic acid. The core has a specific deflection under a specific load, and the ball has a specific initial velocity. The dimples on the surface of the ball have a volume ratio VR of from 0.95 to 1.7.

An object of the present invention is to provide a pneumatic tire capable of, while restricting deformation of groove portions to prevent groove cracks, preventing chipping-off or break-off of protruding portions formed on wall surfaces of the groove as well as preventing irregular wear of the tire. In order to achieve the object, a pneumatic tire comprises a tread surface formed with a plurality of groove portions thereon, wherein at least one of the wall surfaces of the groove portion includes protruding portions and cut-off portions opened to the groove wall surface, and the protruding portions and the cut-off portions are formed alternately on the groove wall surface in an extending direction thereof.

A method is described for safely opening the shell of a munition (10) having an inner chamber containing an explosive material. The method comprises the steps of machining a groove (20) into the shell along a parting line that encircles the outer surface of the munition and divides the shell into two parts. The groove (20) is of sufficient depth to weaken the shell but not to penetrate into the inner chamber of the munition. After machining the groove (20), the shell is cracked open by prising the two parts of the shell apart by inserting a suitable implement into the groove.

In a constitution wherein a ring shaped thin part (50) is formed integrally with a cover body main body (4) by a coining process, a pair of ribs (6, 7) formed integrally with the cover body main body (4) so as to jut out from the cover body main body (4) are disposed so as to extend along the short side direction (4a) of the cover body main body (4) and also be disposed on both sides of the ring shaped thin part (50) along the lengthwise direction (4b) of the cover body main body (4).

A practice golf ball has a core made of a rubber composition which includes a base rubber, a co-crosslinking agent, a crosslinking initiator and a metal oxide, and has a cover which encases the core and is made of a resin material. The co-crosslinking agent is methacrylic acid. The resin material has a breaking strength of 20 to 80 MPa and an elongation of 150 to 600%. The ball is endowed with the properties required of practice balls intended for long-term use, including better durability to cracking and durability of appearance than ordinary game balls, and also better durability to ball surface loss than the one-piece golf balls which are commonly used as practice balls.

A muffle tube inspection method inspects a muffle tube used for dehydrating and sintering a silica glass-based optical fiber preform, the muffle tube includes a sintering furnace provided with a furnace body covering a heater disposed around a periphery of the muffle tube. The method detects a crack generated at the muffle tube by measuring a pressure inside the furnace body while varying a pressure inside the muffle tube.

A micromechanical component for a sensor or microphone device, including a substrate, a frame structure, which is situated on the substrate surface and/or at least one intermediate layer, and a diaphragm, which spans an inner volume, which is at least partially framed by the frame structure. The micromechanical component includes a bending beam structure, which is situated in the inner volume and includes at least one anchoring area, which is attached to the frame structure, to the substrate surface and/or to the at least one intermediate layer, and at least one self-supporting area, which is connected via at least one coupling structure to the diaphragm inner side of the diaphragm in such a way that the at least one self-supporting area is bendable by way of a warping of the diaphragm.

The invention relates to the technical field of torpedo water entry buffer load reduction design, in particular to a carbon fiber composite buffering and load-reducing hood and a preparation method thereof. The carbon fiber composite buffering and load-reducing hood comprises a carbon fiber composite cover, a buffering and load-reducing assembly, a positioning ring and fixing assemblies. A buffering assembly is located at the position close to the end part of the carbon fiber composite cover and arranged in the carbon fiber composite cover; a positioning ring mounting groove is formed in the carbon fiber composite cover; the positioning ring is fixedly mounted in the positioning ring mounting groove; the tail end of the carbon fiber composite cover is cylindrical; a plurality of fixing assembly mounting grooves are formed in the cylindrical section part of the tail end of the carbon fiber composite cover; the fixing assemblies are fixedly arranged in the fixing assembly mounting grooves respectively; and the carbon fiber composite cover is prepared by performing high-temperature vacuum curing on a carbon fiber paving layer. By using the carbon fiber composite buffering and load-reducing hood and the preparation method disclosed by the invention, the technical problem how to reduce potential damage, caused by a water surface impact load, to internal components when a torpedo enters water is solved.

A liquid ejection head includes a flow channel-forming substrate having a plurality of pressure-generating chambers communicated with nozzles configured to eject droplets, the plurality of pressure-generating chambers being arranged in parallel with each other; a plurality of pressure-applying units configured to apply pressure to interiors of the pressure-generating chambers; and a joining substrate joined onto one surface of the flow channel-forming substrate. The flow channel-forming substrate includes a silicon single crystal substrate having a (110) plane orientation and has a side surface extending in a longitudinal direction of the pressure-generating chambers, the side surface being composed of a first (111) plane perpendicular to a (110) plane. The joining substrate includes a silicon single crystal substrate having a (110) plane orientation and is joined onto the flow channel-forming substrate so that a first (111) plane of the joining substrate perpendicular to the (110) plane intersects the first (111) plane of the flow channel-forming substrate.