139results about How to "Avoid residual stress" patented technology

The invention discloses a method for predicting and simulating errors of an end-milled surface. The method includes the steps that various influence factors causing the machining deformation errors in the end-milling cutting process are analyzed, and a machined-surface single-factor and multi-factor error vector model and an error accumulation vector relation model are built in cooperation with end-milling characteristics; by virtue of a calculation and simulated analysis method, based on a solving method for the machined-surface flatness errors, according to a least regional method, the flatness errors are calculated with a self-adaptation genetic algorithm based on real number encoding, verification is carried out through living example calculation, and contrastive analysis is carried out on the errors and errors of a traditional genetic algorithm. The method is simple and convenient to operate, and the problems that heat stress is caused by cutting heat, residual stress is caused by unloading and loading loads, strict quantitative or logical relationships do not exist between the heat stress and the residual stress, and great difficulty is brought to analysis of the machined surface errors are well solved.

The invention provides a double-restraint self-reset buckling-proof energy-dissipation support. The support consists of a novel disc spring self-reset assembly and a buckling-proof support assembly, wherein the self-reset assembly has a friction energy dissipation function, great self-reset performance under the action of medium and small earthquakes and an excellent energy dissipation capacity; the buckling-proof support assembly consists of a core plate, a limiting plate, constraint channel steel and a bolt, wherein the core plate adopts a linear section-variable form, and carbon fiber clothis stuck to the core plate locally to form a local reinforcing section in order to achieve the effect of a preset necking section. By fully utilizing the energy dissipation performance of the core plate in a necking stage of the steel, the accumulated energy dissipation capacity and hysteresis performance of the core plate are improved, and the performance of the core plate shows that a multi-wave buckling phenomenon of the support core plate is obviously inhibited and the accumulated ductility of the core plate is obviously improved. The double-restraint self-reset buckling-proof energy-dissipation support has good self-reset performance and great energy-dissipation performance and is simple in structure, convenient to install and easy to popularize.

The invention provides an electrostatic surface laying layer system manufactured through a powder bed additive. The electrostatic surface laying layer system comprises a formed working table top, a powder supply cylinder and a forming cylinder are arranged below the working table top, a truss mechanism is connected above the working table top through connection plates, the truss mechanism is configured with a sliding rail, the sliding rail is matched with a sliding block, a guide rod is connected to the sliding block, the bottom of the guide rod is connected with an electrode powder pressing plate, the sliding block is controlled by a stepping motor connected to the end of the sliding rail, a ceramic plate and a resistance wire are embedded into an electrode powder pressing plate body of the electrode powder pressing plate, and the ceramic plate is located above the resistance wire. According to the electrostatic surface laying layer system, a mode of electrostatic attraction force is adopted, and charged powder is densely adsorbed to the electrode powder pressing plate, so that the powder is compressed to the surface of a formed piece, and the effect of improving density of parts is achieved; after powder pressing is achieved, the electrode powder pressing plate preheats each layer of powder and the formed piece below the powder, and the phenomena of buckling deformation and the like are avoided; the mobile electrostatic surface laying layer system is high in speed, the powder laying amount is precisely controlled, and production efficiency is improved.

The invention provides a single-silicon chip microflow sensor suitable to be packaged in a surface mounting way and a manufacturing method for the single-silicon chip microflow sensor. The single-silicon chip microflow sensor comprises a monocrystalline silicon substrate, two pressure sensors and a microfluidic channel with an inlet/outlet. A single-silicon chip single-sided bulk silicon micromachining method is adopted, so that the microfluidic channel and reference pressure cavities of the pressure sensors are formed in the monocrystalline silicon substrate, and the two pressure sensors and the inlet/outlet of the microfluidic channel are ingeniously integrated on the same surface of the same monocrystalline silicon substrate, so that the single-silicon chip microflow sensor is simple in structure. The problems of residual stress caused by heat mismatch between different bonding materials and the thickness non-uniformity of pressure sensitive thin films of the pressure sensors are avoided, a surface mounting packaging technology is suitable for the integration of a bare chip of the single-silicon chip microflow sensor and a microfluidic system, the single-silicon chip microflow sensor and the manufacturing method have the characteristics of low production cost, convenience in packaging, high sensitivity, high stability and the like, and the single-silicon chip microflow sensor is suitable for mass production.

The invention provides a novel prefabricated type steel-concrete composite beam bridge upper structure comprising main steel beams, transverse connecting steel beams, metal connecting pieces and prefabricated reinforced concrete bridge deck slabs. The main steel beams are arranged according the shape of a bridge. The webs of the adjacent main steel beams are connected through the transverse connecting steel beams. The upper flanges of the main steel beams are provided with the metal connecting pieces. The prefabricated reinforced concrete bridge deck slabs are laid on the upper flanges of the main steel beams and provided with preformed holes used for grouting of grouting materials after the bridge deck slabs are well installed. The metal connecting pieces are located in the preformed holes. The invention further provides a manufacturing technology of the novel prefabricated type steel-concrete composite beam bridge upper structure. By the adoption of the novel prefabricated type steel-concrete composite beam bridge upper structure and the manufacturing technology of the novel prefabricated type steel-concrete composite beam bridge upper structure, damaged medium and small span concrete beam bridges can be rapidly replaced, the structure safety is good, the construction period is short, the cost is low, and the durability is good.

The invention relates to a connecting node of a beam and a column of building steel structures, in particular to a connecting node of a square steel pipe column and H-shaped steel beams for multi-layer and high-rise steel structures. The connecting node comprises a square steel pipe column, H-shaped steel beams and T-shaped steels; the T-shaped steels are arranged on the lateral wall of the square steel pipe column and the upper and lower wing edges of the H-shaped steels; webs of the T-shaped steels are connected with the wing edges of the H-shaped steel beams; and the wing edges of the T-shaped steels are fixedly connected with the lateral walls of the square steel pipe column. According to the connecting node of the square steel pipe column and the H-shaped steel beams, the connecting node is simple in structure, and the problem of construction difficulty in installing an internal separating plate is solved; a plastic hinge shifts outwards and better shock-absorbing property is achieved; the construction of an upper floor and the casting of concrete in the square steel pipe are not influenced; and the steel consumption is low. Therefore, the connecting node has high economic and social benefits.

The invention relates to a jet-flow-guided laser-spark-electrolysis combined machining device, and belongs to the field of non-traditional machining. The jet-flow-guided laser-spark-electrolysis combined machining device adopts the structure integrating three non-traditional machining methods, and is composed of a laser generator, a machining module, a working solution circulation system and a power supply module, wherein the laser generator is placed above the machining module, and laser beam machining and spark machining are ensured to be coaxial; an electrode in the machining module for sparking machining can be stationary or rotary; the working solutions for jet-flow-guided laser machining and spark machining employ deionized water, and form a set of working solution circulation system with the working solution for electrolytic machining. When the device is used for machining, the jet-flow-guided laser machining and spark machining are employed as the main means for removing material, being accompanied by electrolytic machining; speed, accuracy and surface quality of part manufacturing are all taken into consideration; thereby, rapid machining of various micro holes with abnormal countersunk heads, and various defects caused by using single non-traditional machining method are overcome.

The invention belongs to the technical field of ferrous metallurgy, and discloses a corrosion-resistant steel plate for an ocean platform and a production method of the steel plate. The corrosion-resistant steel plate is prepared firstly from the combination of proper components in percentage by weight and then by carrying out KR molten iron pretreatment, converter smelting, argon-blowing station fed with aluminum wire, LF furnace refining, VD vacuum refining, continuous casting, heating, controlled rolling and controlled cooling, heap cooling, quenching, tempering and the like. According to the corrosion-resistant steel plate for the ocean platform and the production method of the steel plate, compared with the prior art, the produced steel plate has the advantages of excellent corrosion resistance, good low-temperature impact toughness and excellent comprehensive performance, and is especially suitable for being used under cold weather and seawater corrosion conditions.

The invention discloses a preparation method of a titanium alloy bar for a pedicle screw. The preparation method comprises the following steps: firstly, performing rounding coarse straightening treatment on original rolled bar blanks by adopting a straight drawbench, then removing surface defects by using a flaying machine, simultaneously performing sizing determining operation at a discharge hole, straightening in a vertical electrothermal straightening mode, and finally, performing centerless grinding treatment to obtain a finished bar. According to the preparation method of the titanium alloy bar for the pedicle screw, the rounding coarse straightening treatment is performed on the rolled bar blanks by adopting the straight drawbench, and a traditional two-roll or multi-roll straightening rounding mode is replaced, so as to prevent residual stress due to coarse straightening; the residual stress generated by traditional two-roll or multi-roll fine straightening is removed by utilizing the vertical straightening mode, and the problem of necking caused by unbalanced stress of a U-shaped groove of the pedicle screw due to excessive inner stress of the titanium alloy bar prepared in the prior art is solved; the preparation method has the advantage of simplicity and is suitable for mass production and machining.

The invention discloses a soft thin film transferring device and a soft thin film transferring method. The soft thin film transferring device comprises a first roller wheel, a connecting component and a second roller wheel, wherein the connecting component is pivoted to the second roller wheel and is connected to the first roller wheel telescopically so that the second roller wheel can protrude out from a first peripheral surface; and the peripheral surfaces of the first roller wheel and the second roller wheel are respectively provided with a controllable adsorption device. When in use, the soft thin film transferring method comprises the following steps of: peeling the edge part of a soft thin film which is adhered to a first support plate from the first support plate by using the second roller wheel; peeling the main part of the soft thin film from the first support plate by using the first roller wheel; adhering the edge part to a second support plate by using the second roller wheel; and adhering the main part to the second support plate by using the first roller wheel. Therefore, the device and method solve the problem of warpage when the soft thin film is transferred in the prior art.

The invention discloses a self-resetting double-bow opposite-pull double energy dissipation supporting device. A belleville spring is adopted as a reset system, an arc-shaped steel plate is used as ametal energy dissipation element, in the case of the metal energy dissipation element, the arc-shaped steel plate belongs to a bending yield energy dissipation type, compared with other traditional metal energy dissipation modes, the energy dissipation performance of the arc-shaped steel plate is stable, damaged positions of the element are easy to control, in addition, the arc-shaped steel plateenergy dissipation element is easy to replace after an earthquake, recycling of integral support is realized, the economical and practical requirements are confirmed, and wide popularization is easy;in the case of a reset device, the price of the belleville spring is low, restoring force can be stably provided, and the influence on the temperature, humidity and other external factors is smaller;and no damage and low damage during the earthquake and self-resetting after the earthquake of the supporting device are realized, the structural construction is simple and clear, and the manufacturingand mounting process is simple and convenient.

The invention relates to a self-focusing laser processing device. A container for containing a non-linear medium is fixed between a lens and a workbench by the aid of a clamping mechanism. A laser beam is focused on the surface of the non-linear medium, the laser beam focused by the lens enters the non-linear medium to be transferred to produce self-focusing, and through two times of focusing by the lens and the non-linear medium, the laser beam leaving the container has the extremely small diameter and is linearly spread to the surface of a workpiece. The depth of the non-linear medium in the container, that is, the self-focusing distance L is related to energy of the laser beam and the refractive index of the adopted non-linear medium. A water jet auxiliary device is also provided, and the laser focus point on the surface of the workpiece coincides with the jet injection point center. Impact of water jet on the surface of the workpiece carries away residues and heat removed by laser. Lens focusing and self-focusing are combined, almost half of the diameter of the laser beam is reduced, and the energy density of the laser beam is increased. Laser alignment transfer is realized after self-focusing, the divergence angle is small, longitudinal etching is facilitated, the processing depth is increased, and the etching accuracy and efficiency are guaranteed.

The invention provides a polycrystalline diamond cubic boron nitride composite sheet. The polycrystalline diamond cubic boron nitride composite sheet comprises a hard alloy substrate, a polycrystalline diamond composite layer, a polycrystalline cubic boron nitride composite layer and a hard alloy protective layer which are sequentially arranged from bottom to top, wherein the polycrystalline diamond composite layer is composed of diamond micro powder and a nano metal binding agent, and the polycrystalline cubic boron nitride composite layer is composed of cubic boron nitride micro powder and ametal ceramic bonding agent. The invention further provides a method for preparing the polycrystalline diamond cubic boron nitride composite sheet. The method comprises the following steps that the diamond micro powder and the nano metal bonding agent are used for preparing a diamond bonding agent mixture; the cubic boron nitride micro powder and the metal ceramic bonding agent are used for preparing a cubic boron nitride bonding agent mixture; the hard alloy substrate is put into a tantalum cup, and the diamond bonding agent mixture and the cubic boron nitride binding agent mixture are sequentially poured into the tantalum cup; and the hard alloy protective layer is put into the tantalum cup, then vacuum heat treatment is carried out, and then high-temperature high-pressure sintering treatment is carried out. The composite sheet has high impact toughness and high strength.

In an optical curable resin (OCR) composite for laminating optical substrates and a method of using the OCR composite to laminating two optical substrates, the OCR composite is formed by projecting an ultraviolet light to cure a liquid adhesive containing a plurality of bead-shaped elastic particles, and the method includes the steps of coating the liquid adhesive onto a first optical substrate, stacking the first optical substrate to a second optical substrate, such that each particle is separated between the first and second optical substrates, and projecting the ultraviolet light onto the first and second optical substrate again to cure the liquid adhesive, so that the particles are separated to form a gap with equal heights between the first and second optical substrates to enhance the lamination efficiency and quality of the optical substrates.

The invention discloses a memory alloy self-restoring heat dissipation damper. A first inner pulling and pressing board and an outer pulling and pressing board capable of sliding relatively are arranged. A self-restoring structure is formed by a vertical blocking board and a limiting blocking board set so as to convert relative motion of the inner pulling and pressing board and the outer pulling and pressing board to a pulled state of memory alloy rods. Damping cushion is realized by utilizing material performance of the memory alloy rods. When the stress is too large, friction layers betweenthe inner pulling and pressing board and the outer pulling and pressing board act in common so as to dissipate energy input of the structure, and dissipation of great energy is realized through friction deformation, and absorption of dissipated energy by stressed parts in a building structure in an earthquake is reduced, so that an effect of protecting the building structure is realized. The memory alloy rods in the damper can enable the damper after an earthquake to restore to an initial state, so that residual deformation of a building is reduced and even eliminated after the earthquake. Theinvention can provide comparatively large damping force and utilizes the memory alloy rods and the friction layers to dissipate energy in a graded manner. The cost of the damper is reduced and structural energy dissipation requirements of different phases are met.

The invention provides a method for manufacturing a polycrystalline diamond compact and belongs to the fields of oil drilling and engineering machinery. The diamond compact comprises a matrix and composite layers, wherein the composite layers are manufactured by stirring and sintering tungsten carbide micropowder, a metal bond, a grain growth inhibitor and diamond micropowder, and comprise the composite layer I, the composite layer II and the composite layer III which sequentially cover and coat the upper end of the matrix; the composite layer I and the composite layer II are bonded by the metal bond; and the composite layer II and the composite layer III are also bonded by the metal bond. The diamond compact manufactured by the method avoids residual stress between a hard alloy matrix baseplate and the polycrystalline diamond composite layers, therefore, is high in strength, and excellent in tenacity, and has the characteristics of high impact toughness and bending resistance, and the like. Accordingly, the polycrystalline diamond compact is improved in usability and prolonged in service life.

The invention discloses a 60-120mm improved weather-proof structural steel S355K2W thick plate and a production method thereof. The weather-proof structural steel S355K2W thick plate comprises the following chemical components by mass percent: 0.08-0.15% of C, 0.20-0.45% of Si, 1.20-1.45% of Mn, less than or equal to 0.018% of P, less than or equal to 0.007% of S, 0.015-0.050% of Als, less than or equal to 0.15% of Nb+V+Ti, 0.45-0.70% of Cr, 0.30-0.50% of Cu, and the balance of Fe and residual elements. A technological process of the weather-proof structural steel S355K2W thick plate comprises the steps of high-quality molten iron and KR molten iron pretreatment, a 100/120t top-bottom combined blowing converter, LF (ladle furnace) refining, vacuum degassing treatment, casting blank pile cooling for 24-60h, a pusher type heating furnace, a 3800m rolling mill, ACC (accelerated) laminar cooling, an 11-roll thermal straightener, pile cooling, finishing, external inspection, fault detection and warehousing. The weather-proof structural steel S355K2W thick plate and the production method have the benefits that the performance of the steel plate can reach a requirement of a national standard in a TMCP (thermal mechanical control processing) rolling and steel plate piling slow cooling mode under the condition of constant traditional S355K2W carbon equivalent; a production technology is simplified; a heat treatment process is cancelled; the production energy consumption is reduced; and the production cost is lowered greatly.