33results about How to "Achieve isotropy" patented technology

The invention is related to the foundry practice. According to this invention, the method for making castings by directed solidification from a selected point of the melt toward the periphery of the casting comprises forming a casting in a mold having thermodynamic characteristics that allow uniform volume cooling of the melt to be effected to a temperature at which natural solidification processes are completed. To improve the structural isotropy of the casting formed, the cooling is effected at a rate not exceeding 0.5° C. / sec. The casting is formed in a nonuniform field of force. The nonuniform field of force is set up by ultrasonic waves focused on a selected point of the melt to form therein a localized elevated pressure zone and to direct the solidification front from the zone toward the periphery of the casting. The nonuniform field of force is sustained in the mold until the cooling casting reaches a temperature at which the natural melt solidification processes are completed as the melt cools. Before the melt is poured into the mold, it is overheated to a level that, together with the thermodynamic characteristics of the mold allowing the melt therein to be cooled at a rate not exceeding 0.5 K / sec, sustains the liquid phase of the melt for a time sufficient for directed melt solidification to be effected from the selected point of the melt toward the periphery of the casting before the commencement of natural melt solidification processes as the melt cools. Subsequently, as the temperature at which natural solidification processes are completed is reached, the nonuniform field of force is removed, and casting cooling may continue at any reasonable rate.

The invention relates to a designable layered structure of oblique yarns in a plane, which has multiple layers, and each layer is composed of warp yarns and oblique yarns, wherein the warp yarns are distributed in a sinusoidal form along the length direction of the fabric; Extend forward or reverse spirally along the length direction at a certain angle with the warp yarns, and interweave with the warp yarns, the aforementioned included angle is an acute angle; while the oblique yarns interweave with the warp yarns of the current layer, they also interweave with the warp yarns of the adjacent layer. The invention can improve the in-plane isotropic performance, facilitate the realization of mechanized preparation, and can better meet the requirements of fabric uniformity, integrity, high damage tolerance, impact resistance, delamination resistance and fatigue resistance, and has good uniformity and performance Excellent, easy to operate, conducive to mechanized preparation, high efficiency and low cost. The present invention can be applied to the molding of plate-shaped fabrics, and can also be applied to the molding of rotary-shaped fabrics such as cylindrical, conical, and special-shaped fabrics.

A fiber-optic three-dimensional trigger probe device and measurement method, the device includes a light source, an optical fiber measuring rod, an elastic reset mechanism, a measuring ball coated with a reflective film, and a photoelectric detection unit, the optical fiber measuring rod has a central optical fiber and 4N receiving optical fibers coaxially and uniformly distributed around the central optical fiber, N is a positive integer, and the elastic reset mechanism is arranged between the optical fiber measuring rod and the measuring ball to reset the measuring ball to In the initial position, the light source emits constant power light and is transmitted to the measuring ball through the central optical fiber, and the light reflected by the reflective film is transmitted to the photoelectric detection unit through the receiving optical fiber. The device can overcome the measurement error caused by the force deformation of the measuring rod during detection, and has high resolution and measurement accuracy at the same time.

The invention provides a method for preparing a billet for a medicine-shaped cover, which sequentially performs multi-directional reciprocating and ultra-low temperature large-deformation extrusion; the multi-directional reciprocating upsetting extrusion is sequentially performed on three faces of the six-sided billet with the same apex Reciprocating upsetting extrusion, single extrusion ratio ≥ 1.5, complete 2 to 4 cycles of multi-directional reciprocating upsetting extrusion; the ultra-low temperature and large deformation extrusion is to subject the billet to cryogenic treatment for 60 to 150 minutes, and extrude the working part of the extrusion die The inner cone angle is 90°~140°, and the extrusion rate is 10~20mm / s. The invention can realize fine-grained and weak texture structure, and improve the isotropy, high yield ratio and high ductility of the liner.

An embodiment of the invention provides a method for preparing a composite material. The method comprises the following steps of: forming a semispherical groove of a preset array on a first substrate; filling a preset spherical dielectric material in the semispherical groove of the first substrate, the diameter of the spherical dielectric material being the same as that of the semispherical groove; forming a semispherical groove the same as that of the first substrate on a second substrate; and splicing the first and second substrates to embed the spherical dielectric material in a spherical cavity formed by splicing the first and second substrates, thereby obtaining the composite material. The composite material is obtained by splicing the spherical dielectric material in the substrates to achieve isotropy and a simple process flow.