5results about How to "Improve isotropic performance" patented technology

The invention belongs to the technical field of continuum robots, and discloses a variable-rigidity and driving combined continuum robot and an optimization design method thereof.The variable-rigidity and driving combined continuum robot comprises a second section, a middle transition section, a first section, a first section rope and a second section rope, and the second section and the first section are connected through the middle transition section; each of the second section and the first section comprises a plurality of wire guiding discs and a plurality of check rings, every two adjacent wire guiding discs are connected through the corresponding check ring to form a cylindrical pair joint, and the four first section ropes and the four second section ropes are evenly distributed relative to the center line of the continuum robot; the four first section ropes are used for driving two mutually perpendicular degrees of freedom of the first section, the four second section ropes are used for driving two mutually perpendicular degrees of freedom of the second section, and the second section and the first section move independently. The continuum robot does not need to be assembled, is flexible in movement, controllable in rigidity and small in friction force, and improves the interaction and sensing ability with the environment during operation.

The application relates to the technical field of metal additive manufacturing, in particular to an SLM additive manufacturing method and system based on ultrafast laser in-situ assistance and application, which comprises the following steps: a three-dimensional model of a part to be formed is established and slice processing is carried out to generate a scanning path of a main laser; an ultrafast laser is coaxially combined with the main laser, and working parameters of the main laser and the ultrafast laser are set; a layer of metal powder is laid in a forming area, the main laser scans and melts the metal powder according to the scanning path to form a molten pool, and the ultrafast laser acts on the tail of the molten pool or the solidification front of the point after the main laser scans the point at a preset time interval; layer-by-layer processing is carried out until the whole part is manufactured. The ultrafast laser is coaxially integrated with the main laser, and in a preset time interval after the main laser scans a point to melt the metal powder and form a molten pool, the ultrafast laser is used to impact and inject energy into the tail of the molten pool or the solidification front which is advancing, so that grain refinement, defect elimination and stress regulation can be realized, and high-performance metal parts with small and uniform microstructure, few internal defects, low residual stress, excellent mechanical properties and significantly improved isotropy can be prepared.

The invention discloses a water-free disperse dye printing ink and a printing process thereof. The disperse dye printing ink provided by the invention is used in combination with the printing process. Vinyl is introduced into a dispersant for preparing the ink and a pretreatment agent used for printing pretreatment. The two undergo a polymerization reaction in the steaming and color fixing stage to achieve two-phase crosslinking, thereby accelerating the diffusion and coloring of the disperse dye on fabric fibers, fixing the floating color at the same time, greatly improving the dye uptake rate, and achieving the purpose of water-free printing.

The invention belongs to the field of mineral castings, and particularly relates to a low-thermal-expansion mineral casting and a preparation method thereof. The mineral casting provided by the invention comprises the following raw material components: 35-70 wt% of silanized mineral aggregate, 20-60 wt% of a negative thermal expansion additive and 5-15 wt% of a binder, the negative thermal expansion additive is beta-eucryptite; the binder comprises epoxy resin and a curing agent. The negative thermal expansion material-beta-eucryptite is embedded in the mineral casting, the thermal expansion coefficient of the mineral casting is reduced, the manufacturing precision is improved, and the obtained mineral casting is good in isotropy, uniform in deformation in all directions and widely applied to machine tool manufacturing, building or transportation.

The present invention belongs to the field of robot technology. The purpose is to provide a partially decoupled two-rotation two-movement parallel mechanism, which can achieve partial decoupling, reduce the mutual influence between different movements, and has the characteristics of low manufacturing cost, simple assembly, flexible control, strong load-bearing capacity, high precision and rigidity, and good isotropy. The technical solution is: a partially decoupled two-rotation two-movement parallel mechanism, characterized in that: the parallel mechanism includes a frame, a first moving platform and a second moving platform connected by a fifth rotating pair, a first branch and a second branch connected in parallel between the frame and the first moving platform, and a third branch and a fourth branch connected in parallel between the frame and the second moving platform; the four branches have the same structure.