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42results about How to "Improve formability" patented technology

Environmentally-friendly lead-free free-machining zinc white copper and preparation method thereof

The invention discloses an environmentally-friendly lead-free free-machining zinc white copper and a preparation method thereof. The zinc white copper comprises the following components in percentage by weight: 27.0-44.0% of zinc, 6.0-25.0% of nickel, 0.05-2.5% of silicon, 0.03-0.1% of cerium, 0.03-1.5% of phosphorus and the balance of copper and inevitable impurity, wherein lead content in the impurity is less than 0.01%. The preparation method comprises the steps of smelting, horizontal continuous casting, cold machining, heat treating and the like. The copper alloy of the invention also has high strength (sigma b=700-750 MPa) and favorable machining performance which is more than 70% of lead brass C36000. Hot extrusion shaping and horizontal continuous casting shaping can be adopted; the zinc white copper has favourable cold and hot pressure processing performance, is an environmentally-friendly novel material, can completely replace lead and zinc white copper to prepare various free-machining elements, can be processed into copper alloy products, such as lines, rods, plates, strips, sections, tubes, cast and the like, can be widely applied to the manufacturing industry, such as pen points, eyeglass accessories, instrument accessories and the like and is an ideal substitute for lead and zinc white copper.
Owner:NINGBO POWERWAY ALLOY MATERIAL

Forming method for improving forming performance of 6XXX series aluminum alloy plate

The invention relates to a forming method for a 6XXX series aluminum alloy plate for an automobile body. The method includes the steps that dies are installed on stamping equipment, and the female die and the male die are adjusted to be aligned, wherein a heating element is arranged inside the stamping female die, and a cooling device is arranged inside the male die; the 6XXX series aluminum alloy plate of which the thickness is 0.8 mm-1.5 mm and the heat treatment state is T4 is placed on the stamping female die, then the stamping female die is heated to 160 DEG C-250 DEG C, the male die is kept at the indoor temperature, and the heat preservation process is controlled to last for 3 min-15 min; after heat preservation, a punching machine program is started, warm forming treatment is performed, and the whole stamping process is controlled to last for 5 min-25 min; after forming is finished, the position of a pressing head is kept unchanged, pressure maintaining is performed on the plate, and the pressure maintaining process lasts for 5 min or less; the formed plate is taken out and air-cooled to the indoor temperature, and then warm forming treatment is completed. By means of the method, the forming performance and service strength performance of the aluminum alloy plate can be collaboratively improved.
Owner:CENT SOUTH UNIV

EBM variable direction forming dynamic slicing method cooperated with 840D numerical control system

The invention discloses an EBM variable direction forming dynamic slicing method cooperated with an 840D numerical control system. The EBM variable direction forming dynamic slicing method comprises the steps of establishing a vertex array object VAO, adjusting a projection matrix to the slicing height during rendering of a three-dimensional model and outputting a two-dimensional section binary image through a reverse ray tracing algorithm; acquiring data of a contour line from the binary image through a two-dimensional contour extraction method, outputting coordinates of an end-to-end closedcontour, connecting all adjacent coordinates into straight lines and connecting all the straight lines end to end to form a closed curve; and dividing the contour data into a straight line part and acurve part with the starting point of the small straight lines with the included angle of 140 degrees as the segmentation point when the triangle tolerance is one, removing neighbor points, repeated points and internal points of the same straight lines, conducting segmentation fitting on a slicing data curve through a NURBS curve and then conducting dynamic slicing through the 840D numerical control system. Through the EBM variable direction forming dynamic slicing method, the computing time and conversion errors of STL files are reduced, and meanwhile, the phenomenon of over-accumulation of straight line inflection points is reduced.
Owner:XI AN JIAOTONG UNIV

Internal heating and pressurizing pipe distortion rectification device and method

The invention discloses an internal heating and pressurizing pipe distortion rectification device and an internal heating and pressurizing pipe distortion rectification method, relates to a pipe distortion rectification device and a pipe distortion rectification method, and aims to solve the problem that the shape and size of a die are easily changed to influence a distortion rectification effect if distortion is rectified after a pipe billet and the die are simultaneously heated when the distortion of a strong-strength pipe is rectified. According to the device, an upper sliding block, an upper die holder and a lower die holder are sequentially arranged on a lower tabletop from top to bottom; a die insert is inserted between the upper and lower die holders; a support block is arranged on the lower tabletop in the die insert; a heating source is arranged on the support block; and an air vent communicated with an inner cavity of the die insert is reserved in the upper die holder. The method comprises the following steps of: placing a pipe billet of which the distortion is to be rectified on the lower die holder in a sealed way; heating the pipe billet; introducing high-pressure gas into the pipe billet; bulging the pipe billet of which the distortion is to be rectified, and gradually attaching the pipe billet to the inner cavity of the distortion rectification insert to finish the distortion rectification; and after the distortion rectification is finished, relieving the high-pressure gas, taking the distortion-rectified pipe billet out, and cutting undistorted areas at the two ends to finish the distortion rectification of the pipe. The device and the method are used for the distortion rectification of the pipe.
Owner:HARBIN INST OF TECH

Hot extrusion mould for producing aluminum roller shutter door guide groove

InactiveCN104174682ASlow down flow rateImprove formabilityExtrusion diesCantileverExtrusion
The invention discloses a hot extrusion mould for producing an aluminum roller shutter door guide groove. The hot extrusion mould is formed by an upper mould body and a lower mould body in an abutting joint mode, a welding chamber is arranged on the feeding face of the lower mould body, cavities and discharging holes are formed between the welding chamber and the discharging end of the lower mould body, and a cantilever beam is arranged at the central position of the lower mould body; six outer bridge sites and four inner bridge sites are arranged on the feeding face of the upper mould body, six circumferential flow dividing holes and one central flow dividing hole are formed between the outer bridge sites and the inner bridge sites, mould cores stretching into the cavities of the lower mould body are arranged at the positions, arranged on the inner bridge sites, of the top and the bottom of the central flow dividing hole, an auxiliary bridge is arranged in the central flow dividing hole, one end of the auxiliary bridge is arranged inside the central flow dividing hole, and the other end of the auxiliary bridge is provided with a fake male head which stretches out of the central flow dividing hole and directly faces the cantilever beam of the lower mould body. According to the hot extrusion mould, the stability of the material flow is improved well, the direct impact of the material flow of the central flow dividing hole to the cantilever beam of the lower mould body can be avoided, the service life of the mould is prolonged, forming of bars is stable, the size of the bars is precise, and the mould is mainly used for producing aluminum roller shutter door guide groove class cantilever bars.
Owner:DAYE TIANGONG MOLD

Electric auxiliary bending forming process method for high-temperature titanium alloy grid rib wall plate

The invention discloses an electric auxiliary bending forming process method for a high-temperature titanium alloy grid rib wall plate. The method comprises the following steps that a high-temperaturetitanium alloy thick plate is milled into a planar grid rib wall plate; two electrodes connected with a pulse current generator are used for conducting contact edge pressing on the two ends of the planar grid rib wall plate respectively; the pulse current generator carries out self-resistance heating on the planar grid rib wall plate through the electrodes; a bending male die is controlled to move downwards to bend the planar grid rib wall plate; and after the planar grid rib wall plate is formed into a designed geometrical shape, the pulse current generator is shut down. According to the electric auxiliary bending forming process method, the idea of pulse current auxiliary forming is applied to the overall forming process of the high-temperature titanium alloy grid rib wall plate, the formability of the high-temperature titanium alloy grid rib overall wall plate is expected to be improved through the material self-resistance heating effect and the electroplastic effect, and the integrated and accurate control over the formability of the high-temperature titanium alloy grid rib overall wall plate is achieved through the electric field-thermal field-force field cooperative control.
Owner:HEFEI UNIV OF TECH

Lyophilized tablet prepared from warfarin composition and preparation method thereof

The invention provides a lyophilized tablet prepared from a warfarin composition and a preparation method thereof and belongs to the technical of medicines and medicine production. The lyophilized tablet is prepared from warfarin, starch and sucrose, wherein the starch and the sucrose serve as adjuvants. By heating the common corn starch, the binding and disintegrating effects of the starch in the lyophilized tablet can be improved, and the formability of the lyophilized tablet can be improved. The adjuvants for preparing the lyophilized tablet only comprise the starch and the sucrose. The lyophilized tablet is prepared by decreasing temperature twice and increasing temperature twice, and the twice temperature decrease and twice temperature increase can ensure that the lyophilized tablet can be well formed, the dissolution rate of the lyophilized tablet can be increased and the bioavailability of the lyophilized tablet can be improved. The lyophilized tablet overcomes the defects of the ordinary tablet prepared from warfarin, is prepared by adopting a few kinds of and a small amount of adjuvants compared with the tablet prepared from warfarin, has high dissolution rate and high bioavailability, has a good clinical treatment effect and can be used for clinical treatment safely.
Owner:HAINAN WEI KANG PHARMA QIANSHAN

Heat treatment method of aluminum alloy for automotive body

InactiveCN105986207AImprove formabilityHigh paint strength and formabilityQuenchingSolution treatment
The invention relates to a heat treatment method of an aluminum alloy for an automotive body. The heat treatment method comprises the following steps of: carrying out homogenizing annealing heat treatment, and then carrying out hot rolling, intermediate annealing and cold rolling machining to form sheet metal; carrying out solution treatment on the aluminum alloy sheet metal at 500-600 DEG C, carrying out rapid quenching till temperature is lower than 110 DEG C, and then carrying out pre-ageing treatment within 20 minutes, wherein according to the pre-ageing treatment process, pre-ageing is carried out for 3-10s at 150-200 DEG C, or pre-ageing is carried out for 0.3-10 hours at 50-90 DEG C. The heat treatment method comprises the following steps of: carrying out homogenizing annealing heat treatment, and then carrying out hot rolling, intermediate annealing and cold rolling machining to form sheet metal; carrying out solution treatment on the aluminum alloy sheet metal at 540-565 DEG C, carrying out rapid quenching till temperature is lower than 100 DEG C, and then carrying out pre-ageing treatment within 30 minutes, wherein according to the pre-ageing treatment process, pre-ageing is carried out for 1-10s at 180-220 DEG C, or pre-ageing is carried out for 0.2-12 hours at 60-100 DEG C. After the aluminum alloy is subjected to the pre-ageing treatment, the property of the aluminum alloy is stable in a room temperature placement process, and before baking finish, the aluminum alloy has good forming property.
Owner:重庆金亚模具制造有限公司

Synchronous powder feeding and laser penetration welding method and system

The invention discloses a synchronous powder feeding and laser penetration welding method. It is characterized in that to-be-welded plates are arranged at intervals to form an I-shaped groove; when the I-shaped groove is filled with alloy powder, the to-be-welded plates on the two sides and the alloy powder filled into the I-shaped groove are irradiated through light spots formed by laser, so that synchronous melting and common solidification of the to-be-welded plates and the alloy powder filled into the I-shaped groove are achieved, and an in-situ alloying welding seam is formed, and the microstructure of a joint is regulated and controlled through in-situ alloying, so that the volume fraction of the brittle phase Al4C3 is effectively reduced, the formability of the welded joint is optimized, the tensile strength of the welded joint is greatly improved, and the welding efficiency and the joint quality are improved. The invention further provides a synchronous powder feeding laser penetration welding system, the structure is simple and reasonable, the microstructure of the joint can be regulated and controlled through the in-situ alloying, the welding efficiency and the quality of the joint are improved, and practicability is high.
Owner:HUAZHONG UNIV OF SCI & TECH
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