57results about How to "Reduce cutting loss" patented technology

The invention relates to a process for cutting a silicon chip by using a steel wire with a diameter of 0.11 millimeter. On a multi-wire cutter, the steel wire with the diameter of 0.11 millimeter, cutting fluid and carborundum are used as main auxiliary materials for cutting and processing the silicon chip. The process comprises the steps of mortar preparation, orientation, bar sticking, cutting preheating, cutting, blanking, degumming and cleaning. The steel wire with the diameter of 0.11 millimeter and with proper tension and cutting speed is matched with the cutting fluid and the carborundum to obtain a better cutting surface and effectively reduce the cutting loss; compared with the universally adopted steel wires with diameters of 0.14 millimeter and 0.12 millimeter, the steel wire with the diameter of 0.11 millimeter can save the raw materials by 6.45 percent and 2.15 percent; and the thinner the silicon chip is, the more obvious the benefit is.

The invention belongs to the technical field of the ferrous metallurgy industry, and relates to a short-process long material endless rolling production line and a short-process long material endlessrolling method. The short-process long material endless rolling production line comprises a steel making furnace, a continuous casting machine, a withdrawal and straightening machine, a rough rollingproduction line, an intermediate rolling production line, a finish rolling production line, a reducing and sizing mill production line and a cooling table. The steel making furnace, the continuous casting machine, the withdrawal and straightening machine, the rough rolling production line, the intermediate rolling production line, the finish rolling production line, the reducing and sizing mill production line and the cooling table are closely connected in sequence. The rough rolling production line comprises a rough rolling unit, an accident shear and cooling table, a heat preservation deviceand a pair of first end cutting flying shears in sequence. The heat preservation device supplements the heat for a casting blank which is subjected to rough rolling operation, and the separation distance between an inlet of the withdrawal and straightening machine and an inlet of the rough rolling unit ranges from 9m to 30m. The intermediate rolling production line comprises an intermediate rolling unit, a water cooling tank and a pair of second end cutting flying shears in sequence. The finish rolling production line comprises a finish rolling unit, a water cooling tank and a pair of third end cutting flying shears in sequence. The reducing and sizing mill production line comprises a reducing and sizing mill unit, a water cooling tank and a pair of fixed-length flying shears in sequence.By the adoption of the short-process long material endless rolling production line, the technological arrangement is simple, the separation distance between the continuous casting machine and the rough rolling unit is small, the rough rolling gripping operation is facilitated, the relative power consumption of the heat preservation or supplement which is conducted after the rough rolling operation is accomplished is low, the cost is low, the industrial production is easily achieved, and the short-process long material endless rolling production line has the obvious economic benefit.

The invention relates to a multi-wire cutter special for sapphire, which belongs to the technical field of cutting devices special for sapphire. The technical scheme is as follows: the multi-wire cutter comprises a cutter body (1), a cutting wire mechanism (2), a swing working platform and a lifting body (4), wherein the cutting wire mechanism is arranged on the upper part of the cutter body, the swing working platform is arranged at the lower part of the cutting wire mechanism, the lifting body is connected with the swing working platform and drives the swing working platform to move up and down, and the swing working platform per se swings left and right to ensure that a workpiece on the swing working platform is matched with the cutting wire mechanism so that multi-wire cutting of the sapphire can be completed. The multi-wire cutter is used for adjusting the cutting angle of the sapphire dynamically, and ensures that the angle of a sapphire material can be continuously adjusted with the swing working platform when the sapphire material is cut so that a cutting wire is in less contact with the material and additional friction force is reduced; meanwhile, the feeding speed of the cutting wire can be greatly increased, the problem of low cutting speed caused by high hardness of the sapphire is solved, and the speed is improved to 2-4 times of that of the common multi-wire cutter.

The invention discloses a large alloy steel part cutting method through a diamond wire saw. Firstly, hanging a large alloy steel part to be cut to a cutting working platform, determining a cutting position of the large alloy steel and making a marker line, then mounting a diamond wire saw, putting the diamond wire saw to the position of the marker line, and adjusting the cutting device to enable the diamond wire saw to be perpendicular to the marker line; secondly, cooling the large alloy steel part with coolant, performing grinding and cutting through closed-loop high-speed rotating of the diamond wire saw; finally, cutting the large alloy steel part to finish cutting. According to the large alloy steel part cutting method through the diamond wire saw, the selected diamond saw is flexible and belongs to high-speed cold machining, not only machining damage and deformation of the large alloy steel part to be cut can be avoided, but also the cutting efficiency and accuracy of the large alloy steel part can be improved, and labor intensity can be effectively reduced.

The invention provides a method and a device for distribution of residual plate blanks in a hot-rolled plate blank front storeroom. The method includes the steps: S100, using a mathematical model for quantitative description of a distribution problem of residual plate blanks in the hot-rolled plate blank front storeroom, wherein the quantitative description includes selecting decision variables, setting an optimization target and determining residual plate blank distribution constraints; S200, setting parameters of the mathematical model in the S100; S300, grouping contract data and plate blank data according to steel levels, wherein each group comprises plate blanks of the same steel level and a contract matched with the steel level of the plate blanks in the group, the plate blanks and the contracts have no distribution relation after grouping; S400, using a mixed dispersion searching algorithm to respectively obtain a distribution scheme of the residual plate blanks and the contracts in each group; and S500, distributing the residual plate blanks in the hot-rolled plate blank front storeroom according to the distribution scheme. From a view of global optimization, all aspects of factors are considered comprehensively, and complete and reasonable distribution of residual stock of the hot-rolled plate blank front storeroom is realized.

The invention provides a water-based cutting fluid for silicon wafers, which consists of the following raw materials in proportions by mass: polyvinyl alcohol, 2-10 parts, benzotriazole, 0.05 parts, deionized water, 89.95-98 servings. The water-based cutting fluid is characterized by low cost and environmental friendliness. Due to the good viscosity and dispersibility of the polyvinyl alcohol aqueous solution, the dispersibility of the blade in this cutting fluid is good, especially after settling, it is easier to redisperse. Using the water-based cutting fluid of the invention has a high qualified rate of finished products, and the silicon wafers after cutting are easier to clean.

The invention discloses a concrete double-mold structure for the top surface of a building, and relates to the technical field of supporting molds for the top surfaces of buildings. The concrete double-mold structure for the top surface of the building comprises a lower assembly plate, an upper assembly plate and a ring beam supporting frame, wherein the lower assembly plate is formed by multiple lower template units which are assembled in the ring beam supporting frame; the upper assembly plate is formed by assembling multiple unit surface molds; the ring beam supporting frame is formed by fixing a rectangular bottom frame and four side templates perpendicularly surrounding the rectangular bottom frame; the left end part and the right end part of the rectangular bottom frame are both provided with long strip-shaped bonding grooves; the upper ends of the four corners of the ring beam supporting frame are all fixedly provided with fixing blocks; the upper ends of the upper assembly plate are all fixedly provided with regulating blocks; the regulating blocks are all perpendicularly and fixedly provided with tension screw rods; the regulating blocks are all connected with the fixing blocks on the corresponding same sides through the tension screw rods. An integral assembly structure is adopted for the concrete double-mold structure for the top surface of the building; the pouring flatness is high; the thickness is uniform; the construction difficulty can be decreased.

The invention discloses a rectangular piece optimization and stock layout method based on plate utilization rates. The rectangular piece optimization and stock layout method based on the plate utilization rates includes the steps that according to basic parameters of plates and rectangular pieces, the utilization rates of the plates corresponding to the rectangular pieces in the width direction and in the length direction are determined; according to the utilization rates of the plates in the width direction and in the length direction, first rectangular pieces laid on a first piece of plate are determined; and whether the first rectangular pieces are completely laid or not is judged, if yes, whether the first piece of plate has a remaining plate or not except the first rectangular piecesis judged, if yes, according to the width and the length of the remaining plate, the utilization rates of the remaining plate corresponding to the rectangular pieces in the width direction and in thelength direction are calculated, and if no remaining plate exists, layout of a second piece of plate is performed. Due to the method, the utilization rates of the plates are increased, and raw materials are saved.

The invention discloses a solar cell capable of reducing cutting loss and a preparation method, one side of the solar cell with an emitter is provided with a plurality of strip-shaped pre-cutting windows, and the pre-cutting windows are grooves formed on the surface of the emitter in a laser scribing or corrosive slurry printing manner. According to the battery piece structure disclosed by the invention, the PN junction at the cutting part is removed by presetting the pre-cutting window, so that the cutting loss of a finished battery during cutting is greatly reduced, the conversion efficiencyof the strip-shaped battery unit obtained after cutting is improved, and finally the output power of the module is improved; the proportion of the depth of the pre-cutting window to the thickness ofthe solar cell is small, and the mechanical performance, such as the fragment rate, of the cell piece in the subsequent process is not influenced; and the preparation method can be realized by utilizing the existing laser slicer and screen printer resources, so that the utilization rate of equipment is improved, and the cost is reduced to a certain extent.

The invention discloses a power grid dynamic track trend prediction method based on a long-term and short-term memory network. The method is characterized by firstly, aiming at a geometrical characteristic of a voltage time sequence vector track, extracting a time sequence evolution rule of a node state, and quickly identifying a same tropism of a system generator; secondly, rapidly predicting a disturbed track of an equivalent machine system based on the long-term and short-term memory network; and finally, calculating a generator tripping amount according to an extended equal-area criterion,and realizing emergency control of transient power angle stability. The method has advantages of scientific and reasonable performance, high applicability and the like.

The invention provides an accurate distribution method for slab resources of an iron and steel enterprise. The method comprises the steps that hot rolling front-warehouse non-order slabs of the iron and steel enterprise and contracts are grouped; the distribution relation of the slabs and the contracts in each non-order slab contract set is judged; the distribution cost goal constraint of the non-order labs and the contracts is calculated; the non-order slabs are distributed to the contracts, and a non-order slab and contract distribution scheme is formed; the non-order slabs which are not included in the non-order slab and contract distribution scheme are clustered to form a virtual contract generating scheme, and the virtual contract generating scheme is issued to a manufacturing execution system of the iron and steel enterprise. The problems that due to the fact that the non-order slabs in the iron and steel enterprise are high in inventory and low in utilization rate, inventory cost is high, and the slab shear amount is large are solved, the utilization rate of the non-order slabs is improved, meanwhile, a large amount of energy waste caused by repeated steelmaking is reduced, the shear amount and inventory of the slabs are reduced, and a large amount of production and storage cost is saved for the enterprise.

The embodiment of the invention provides a composite substrate and a preparation method thereof, a semiconductor device and electronic equipment, relates to the technical field of semiconductors, and is used for solving the problem of high cost of an AlxGayN-based semiconductor device due to high cost of SiC. The composite substrate comprises a bearing layer, a silicon carbide layer and at least one epitaxial layer, wherein the silicon carbide layer is arranged on the bearing layer and is bonded with the bearing layer; and the material of the silicon carbide layer comprises monocrystalline silicon carbide. At least one epitaxial layer is arranged on one side of the silicon carbide layer away from the bearing layer.

The invention discloses a cutting method of a silicon carbide crystal, and relates to the technical field of silicon carbide crystals. The cutting method is used for solving the technical problems of high cost, low efficiency and rough cutting surfaces of an existing silicon carbide cutting method. The cutting method of the silicon carbide crystal comprises the following steps that a cleavage direction or a cleavage surface of the crystal is determined according to a specific crystal structure of the silicon carbide crystal; according to the size and shape of a silicon carbide crystal sample needing to be processed, a track needing to be cut is determined; a groove with a certain depth is manufactured on the determined track by adopting a specific processing technology; and acting force is applied to the position of the manufactured groove, or rapid heat treatment is carried out on the silicon carbide crystal, so that the silicon carbide crystal is completely cracked along the groove, and a small silicon carbide single crystal with a smooth and level section is obtained.

The invention discloses a cutting method for reducing the cutting loss of an LED chip. The method comprises steps of firstly carrying out the half-cutting of a P surface of the chip, carrying out thetesting through a testing machine, and facilitating the output of photoelectric parameters, such as brightness, voltage and wavelength, of the chip; coating photoresist on the P surface of the chip byusing a spin coater to form a shielding film, exposing and developing the P surface of the chip, and corroding and exposing a cutting channel; coating photoresist on the N surface of the chip to protect the metal on the N surface and facilitate subsequent dry etching; washing off the shielding film on the P surface, pasting a blue film, finally washing off the adhesive film on the N surface, pouring the film, and finishing the cutting operation. According to the cutting method for reducing the cutting loss of the LED chip, the N-surface adhesive film design is utilized, and dry etching is matched, so situations of edge breakage, wafer flying and the like during chip cutting are effectively avoided, cutting loss of the chip is reduced, meanwhile, light emitting efficiency of tube core particles is guaranteed, the product yield is increased, and practicability is high.

The invention discloses an ultrahigh-pressure water jet device for cutting a reinforced concrete slab. The ultrahigh-pressure water jet device is characterized in that the device comprises a numericalcontrol system, an automatic sand supply system, an ultrahigh-pressure generator and a water cutting main machine; the numerical control system comprises a control computer, a keyboard, an operationplatform and rollers; the automatic sand supply system comprises a cover, a handle, a sand supply controller, a sand cylinder, a sand discharge hole and a roller foot stool; the ultrahigh-pressure generator comprises a monitoring hole, a pressurizing main machine and a foot support, the monitoring hole is located in the side face of the pressurizing main machine, and the foot support is located atthe bottom of the pressurizing main machine; and the water cutting main machine comprises a stable base, an X-direction workbench, an X-direction rail, an X-direction crawler belt disc, an X-direction crawler belt, an emergency brake, an X-direction pedestal, a Y-direction working bridge frame, a Y-direction crawler belt, a Y-direction rail, a water jet cutter arm, a sand tank and a water jet cutter spray head. By means of the ultrahigh-pressure water jet device, the problems of large current concrete cutting raised dust and noise, irregular cutting and the like can be effectively solved.

The invention discloses a cast-in-place gentle-gradient spatial curved roof formwork system and a construction method thereof. The formwork system comprises a supporting structure and a panel structure; the supporting structure comprises a bottom all-round scaffold and a group of height-adjustable jacking and connecting assemblies, the number of the jacking and connecting assemblies is the same asthat of vertical rods, and the jacking and connecting assemblies are fixedly connected to the top ends of the vertical rods; and the panel structure is divided into a group of rectangular unit modules, each unit module comprises formwork keels, formwork panels and formwork connecting assemblies, the formwork connecting assemblies are fixedly connected to the four corners of each unit module, andthe formwork connecting assemblies of every four adjacent unit modules intersect at the same position and are located on the top of the same jacking and connecting assembly. The cast-in-place gentle-gradient spatial curved roof formwork system is suitable for a large-thickness curved roof of which the curvature change is irregular and the curved unit is approximately regarded as a plane and meetsthe designed curvature requirement. The construction method is high in operability, not only can meet the bearing force requirement, but also can be fitted with the curved surface curvature change, and has the very high market value.

The invention relates to a steel structure landscape mushroom tree and an installation method thereof, and relates to the technical field of landscape steel frames. The trunk part comprises a trunk I, a trunk II and a connecting assembly, and the trunk I is connected with the trunk II through the connecting assembly; a butt joint mechanism is arranged between the second trunk and the tree head part, and the butt joint mechanism comprises an inserting part and a bearing part; the inserting part comprises a top connecting plate, an inserting square column and a connecting piece, the top connecting plate is arranged on the tree head part, and the inserting square column is arranged on the top connecting plate; the bearing part comprises a bearing plate, the bearing plate is provided with a guide channel for the insertion square column to penetrate through, and the connecting piece is used for connecting the insertion square column and the bearing plate; the installation method comprises the following installation steps of splicing, positioning and butt joint. The mushroom tree mounting device has the effects of improving the mushroom tree mounting efficiency of constructors and being energy-saving and environment-friendly.

The invention provides an elastic cutting system for modified root-tuber crops, and relates to the technical field of agricultural machinery. The elastic cutting system comprises a base and a driving device, wherein a floating plate is arranged above the base, an elastic supporting mechanism is arranged between the base and the floating plate, a first cutting knife is arranged at the bottom end of the floating plate, and the driving end of the driving device is connected with the first cutting knife; and the edge of the first cutting knife extends out of the edge of the floating plate, a clamping conveying belt is arranged above the floating plate, and the clamping conveying belt clamps the modified root-tuber crops to move towards the first cutting knife. According to the system, modified root crops can be automatically and mechanically cut, by arranging the combination of the floating plate and the elastic supporting mechanism, the floating plate can be forced to float up and down according to different sizes of modified rhizomes, so that the first cutting knife does not cut the modified roots while having a mechanical cutting function, the cutting loss is reduced, the cutting efficiency is improved, in addition, the economic benefits are increased, the structure is exquisite, and the practicability is extremely high.

The invention provides a PET foam material and a manufacturing method thereof. The manufacturing method of the PET foaming material comprises the step of directly carrying out supercritical foaming on PET particles with the loss factor of 1 +/-0.2. The invention further provides the PET foaming material manufactured by the manufacturing method. According to the manufacturing method of the PET foaming material, the high-temperature processing process of mother board forming can be omitted, degradation of the PET material is reduced, and compared with a PET foaming material with the same density in the prior art, the compression strength of the PET foaming material disclosed by the invention is higher.