43results about How to "Promotes grain refinement" patented technology

The invention discloses a fiber-metal tube necking processing preparation method, which relates to the field of material forming; it includes the steps of: (1) pre-treating an alloy plate and a carbon fiber cloth, stacking and then blanking, rolling and forming after blanking, Seamless welding to form circular pipe fittings; (2) Heating the fiber metal pipe fittings in step (1) and extruding them into the variable-diameter shrinking die, so that the pipes are extruded with each other under the action of the variable-diameter shrinking die to produce plastic deformation and fit tightly to obtain the necked composite pipe; (3) apply ultrasonic vibration around the necked composite pipe in step (2) to assist the plastic deformation of the pipe; (4) apply ultrasonic vibration in step (3), Apply air pressure inside the necked composite pipe and heat it; (5) Keep the temperature constant, then release the internal pressure, and finally take it out for air cooling to get the final product. The necking processing and preparation method of the fiber-metal pipe provided by the invention enables the pipe fitting to have high surface quality and good mechanical properties.

The invention relates to a pure-gold watchcase manufacturing method, comprising raw material melting, rough blank forming, stamping treatment and cutting treatment. The invention also relates to a pure-gold watchcase obtained by the above method, and a dial plate comprising the pure-gold watchcase. The dial plate also comprises an inner container, a movement, a graduated disk, a watch glass, a watch crown and an ear part. The inner container comprises an inner container body and a fixed part. The pure-gold watchcase is wrapped at the outer wall of the inner container. The movement is arranged inside the inner container. The graduated disk is arranged on the top surface of the movement in a covering manner. The watch glass is disposed at an opening of the inner container in a covering manner. With the gold content higher than nine hundred and ninety per one thousand, the pure-gold watchcase achieves good machining performance, allows surface treatment, has high strength and hardness and is adapted to normal knock and collision when used. The rejection rate in the pure-gold watchcase manufacturing process is low, and the production efficiency is high. The dial plate comprising the pure-gold watchcase has good waterproofness, and the strength of an outer shell of the dial plate is further enhanced, so the service lifetime of the dial plate is prolonged.

The invention discloses a nano SiC particle reinforced aluminum matrix composite material and a preparation method thereof. The microstructure of the aluminum-based composite material is composed of ultra-fine grains, nano-SiC particles and nano-precipitated phases. The specific preparation method includes the following steps: mixing nano-SiC and aluminum alloy powder; Uniform dispersion of nanoparticle powder; the mixed powder is made into a block sample by spark plasma sintering; the block sample is heated, and hot-extruded under a certain pressure and extrusion ratio, and consolidated to obtain a fully dense aluminum matrix composite material Rods: The extruded aluminum-based composite rods are subjected to T6 heat treatment, during which the dissolution of coarse precipitates and the precipitation of fine and uniformly dispersed nano-precipitates occur. The invention prepares the ultra-fine structure nano-aluminum matrix composite material, which has the advantages of high strength and high elongation.