36results about How to "Reduce spawn rate" patented technology

The invention provides application of pulegone in pest prevention and control, and relates to the technical field of pest prevention and control. The pulegone can effectively kill adults of the ampullarian snails under the condition of high concentration, can inhibit spawning of the ampullarian snails and reduce the hatching rate of eggs laid by the ampullarian snails under the condition of low concentration, and can effectively inhibit hatching of the eggs and reduce the hatching rate by spraying egg masses of the ampullarian snails under the condition of low concentration. The plant source component pulegone is adopted to kill the ampullaria gigas, reproduction and breeding of the ampullaria gigas can be effectively destroyed at the same time, prevention and control of the ampullaria gigas are further achieved, and on the basis, pulegone can kill harmful snails such as snails.

The invention discloses application of a natural inducer in fruit preservation, and particularly relates to the technical field of fruit preservation. According to the application of the natural inducer in fruit preservation, the natural inducer is used as an active ingredient to inhibit growth of botrytis cinerea on fruits and induce immune systems of the fruits to enhance active oxygen metabolism; the natural inducer is theanine; the fruits are kiwi fruits. When the natural inducer provided by the invention is applied to fruit preservation, a relatively good preservation effect can be exerted on kiwi fruits.

The invention discloses a slide clamping device for a pathological slice scanner, and relates to the field of slide clamping devices. The invention comprises a base, a clamping assembly, a cleaning assembly, a drying assembly, a height adjustment assembly, a transmission assembly, and; the clamping assembly is arranged on the top of the base, the cleaning assembly and the drying assembly are arranged on the base and the clamping assembly, the drying assembly is located beside the cleaning assembly, the height adjustment assembly is arranged below the base, the transmission assembly is connected with the height adjustment assembly and the clamping assembly, and moves to the center of the base through a moving plate, indirectly driving the slide to rise, when clamping slides of different sizes, when clamping a slide of a larger size, the rotating clamping block rotates with a smaller amplitude, the height of the slide rising is also smaller, the distance between the moving plate and the scanner will be smaller, a larger field of view will be scanned, the scanning efficiency will be improved, and the scanning effect will be improved.

The invention provides a self-adaptive message processing method and device, a medium and equipment. The method comprises the following steps: distributing a token bucket for a message queue; a genetic algorithm is adopted regularly to determine token bucket parameters according to the network performance change, wherein the token bucket parameters comprise the token generation rate and the token bucket capacity; generating tokens according to the token bucket generation rate, filling the token bucket with the token when each token is generated, and limiting the number of the tokens in the token bucket to be smaller than or equal to the token bucket capacity; before each message in the message queue is processed, one token is taken from the token bucket; and if the token is successfully taken out, processing the message. The invention provides a message processing scheme which can be adaptively adjusted and intelligently optimized.

The application discloses a method for normalizing mixed C4 olefins containing isobutene. The method comprises the following steps: 1) adding 1-20wt% of tert-butyl alcohol into mixed C4 hydrocarbon; 2) feeding the obtained mixed raw material into a normalizing unit to generate normal butene under the conditions of 280-400 DEG C and normal pressure. The normalizing catalyst comprises the following components: a) 10-20wt% of a binder; and b) 80-90wt% of ZSM-35 molecular sieve. In the method, the tert-butyl alcohol can be hydrolyzed into isobutene and water in the reaction process, the isobutene can be used as the C4 raw material, the water can react with the C4 olefins to generate the intermediate product C4 alcohol, the C4 alcohol can be dehydrated to generate normal butene, and in addition, the water can play a role in inhibiting the hydrogenation of the raw material or the intermediate in the reaction system, thereby reducing the generation probability of alkanes and improving the selectivity of normal butene. The method can efficiently and stably convert the C4 olefins in the raw material into normal butene-rich product, and provides an effective way for synthesizing normal butene.

The invention belongs to the field of molecular genetics, and provides a rice SS3a allele and application thereof in increasing the content of resistant starch in rice and reducing the glucose generation rate. The gene is deleted at the 2387th basic group G of the third exon of the rice SS3a gene and contains a gene sequence as shown in SEQ ID No. 1. The allele can significantly increase the amylose content in rice and change the amylopectin structure, so that the resistant starch content of rice is significantly increased, and the glucose generation rate of rice is reduced. Meanwhile, the allele can also significantly improve the gelatinization characteristic and the viscosity characteristic of the rice, and has small influence on the grain weight of the rice. The invention further relates to application of the new SS3a allele in rice breeding, the allele can be introduced through a cross breeding method, or the original SS3a gene is subjected to site-directed mutagenesis to form the allele, and the allele is used for cultivating a new high-resistance starch rice strain.

A low-NOx ammonia-coal stable combustion swirl burner relates to the field of clean combustion of coal with low carbon and low NOx. This invention addresses the problems of ammonia slip and high NOx emissions in existing ammonia-coal co-combustion technologies. In this invention, a primary air / pulverized coal duct is fitted onto a central NH3 duct, forming a primary air channel between them. An outer NH3 duct is fitted onto the primary air / pulverized coal duct, forming an NH3 channel between them. An inner secondary air duct is fitted onto the outer NH3 duct, forming an inner secondary air channel between them. An outer secondary air duct is fitted onto the inner secondary air duct, forming an outer secondary air channel between them. Tangential and axial blades are respectively installed in the inner and outer secondary air channels. This invention is used for pulverized coal swirl combustion.

This invention discloses an anti-condensation and diversion structure for cable branch boxes, belonging to the field of smart grid technology. It includes a cable branch outer box, within which a diversion hopper and a partitioned inner cavity are provided. The diversion hopper is located below the top of the partitioned inner cavity. This invention divides the upper part of the cable branch outer box into a double-layer structure through the partitioned inner cavity, effectively reducing the temperature difference between the inside and outside of the outer box and lowering the probability of condensation from the source. Combined with a heat-insulating and rainproof frame, it provides dual protection against rain and heat. When condensation occurs on the inner wall of the partitioned inner cavity, it is diverted by the diversion hopper and collected in a cleaning component, preventing condensation from dripping and corroding internal electrical components. Simultaneously, a dehumidification component filters and absorbs moisture from the outside air entering the cable branch outer box, effectively reducing moisture accumulation inside the outer box and comprehensively minimizing condensation, ensuring a dry and stable internal environment for outdoor power distribution equipment in the smart grid.

The present invention provides a method for preparing a multi-level porous iron-based catalyst, comprising the steps of: synthesizing iron hydroxide composite crystals, using soluble iron salt as raw material, synthesizing iron hydroxide composite crystals by template method and hydrothermal synthesis method; calcination treatment, first grinding the iron hydroxide composite crystals, and then high-temperature calcination treatment to obtain a multi-level porous iron-based catalyst. The present invention also provides a multi-level porous iron-based catalyst prepared by the above method. The present invention also provides an application of the above multi-level porous iron-based catalyst in the preparation of methane. The above multi-level porous iron-based catalyst is based on a traditional iron-based catalyst, and a template agent is introduced to form a multi-level pore structure to form a unique pore structure. The pore structure limits the generation of high-carbon molecules, thereby greatly improving the selectivity of methane.

The invention relates to a purification and separation method, a purification and separation system and a preparation method of isocyanate. The purification and separation method of isocyanate comprises the following steps: conveying an isocyanate reaction solution to a light component removal tower, and carrying out primary rectification to obtain an isocyanate crude product solution; directly conveying the first crude product liquid to a finished product tower, heating the second crude product liquid for partial gasification, and then conveying the second crude product liquid to the finished product tower for secondary rectification together with the first crude product liquid to obtain heavy components, isocyanate and low-boiling-point substances; heating a part of low-boiling-point substances for partial gasification, and then refluxing the low-boiling-point substances to the light component removal tower; in the processes of the first rectification and the second rectification, the inert medium is used for cleaning the trays in the light component removal tower and the finished product tower. The purification and separation method is simple to operate, the polymer generation rate is low, the yield of isocyanate is increased, meanwhile, solid waste is reduced, online self-cleaning is achieved, blockage of all equipment in the rectification process can be effectively avoided, the operation stability of the whole purification and separation system is guaranteed, and the operation cycle of the purification and separation system is greatly prolonged.

The present invention provides a nozzle for a gas-particle two-phase suspension metallurgical process, wherein the concentrate is first mixed with swirl wind to produce a premixing effect, and the concentrate particles are dispersed more evenly under the action of the swirl wind. The dispersion of the premixed concentrate and swirl wind is further enhanced by the flow-guiding effect of the guide cone surface. The distributed wind coming out of the dispersed flow channel outlet of the dispersed surface further disperses the concentrate moving there, and the degree of mixing with the peripheral process wind is more sufficient and uniform, thereby improving the concentrate combustion effect, strengthening the mass transfer and heat transfer rates in the reaction tower, helping to improve the equipment capacity, and effectively reducing the smoke dust occurrence rate and the SO3 generation rate in the flue gas.

This utility model relates to the field of printed circuit board technology and discloses an inner layer edge structure of a circuit board, including: a first edge plate body disposed around the substrate body; a plurality of first flow-blocking beads equidistantly arranged on one or both sides of the edge plate body; and a plurality of second flow-blocking beads equidistantly arranged on one or both sides of the first flow-blocking beads, wherein the protruding area of ​​the second flow-blocking beads is larger than that of the first flow-blocking beads, and a first adhesive flow groove is formed between the first flow-blocking beads and the second flow-blocking beads to accommodate the flow of adhesive. This design can not only significantly reduce the flow velocity of the fluid and effectively prevent it from flowing outside the circuit board, thereby avoiding the problem of insufficient adhesive filling of the board pattern, but also the first adhesive flow grooves of different widths formed between the first and second flow-blocking beads of different sizes are interleaved, which can timely and evenly spread the adhesive of the insulating layer along the first adhesive flow groove, thereby ensuring uniform adhesive filling and reducing the probability of defective products.

This application relates to a spraying process for a highly corrosion- and wear-resistant yttrium oxide composite coating, aiming to solve the problems of high porosity, poor high-temperature stability, and insufficient wear resistance of existing yttrium oxide coatings. The process includes degreasing and cleaning, pure water immersion, sandblasting roughening, steam and water rinsing, ultrasonic cleaning, pre-drying, plasma spraying, orthogonal experimental parameter optimization, deep ultrasonic cleaning, and final drying and curing. A yttrium oxide and zirconium oxide composite powder is used to form a dense coating under optimized plasma spraying parameters, and high cleanliness is ensured through multi-stage cleaning and clean environment control. Through the above technical solution, this application significantly improves the coating's density, chemical stability, wear resistance, and thermal shock resistance, effectively blocks the penetration of corrosive media, reduces particulate contamination, and meets the stringent requirements of semiconductor etching equipment for long-lasting protective coatings.

The present invention provides an application of pulegone in pest control, and relates to the technical field of pest control. The pulegone can effectively kill adult golden apple snails at a high concentration, and can inhibit the laying of eggs of golden apple snails and reduce the hatching rate of eggs laid by golden apple snails at a low concentration. At the same time, spraying golden apple snail egg masses at a low concentration can effectively inhibit the hatching of eggs and reduce the hatching rate. That is, the use of pulegone, a plant-derived component, can kill golden apple snails, and can also effectively destroy the reproductive reproduction of golden apple snails, further realizing the prevention and control of golden apple snails, and on this basis, pulegone can also kill harmful snails such as striped snails.

This application relates to the field of security testing technology, specifically to a method and apparatus for generating fuzzy test data for vehicle-to-everything (V2X) security. The method includes: acquiring CAN bus data; calculating a parameter activity coefficient based on CAN bus frame data with the same ID in the real vehicle data, used to measure the activity and boundary conditions of various control commands in the real vehicle data; then combining the correlation between different IDs to perform temporal correlation feature measurement, and further calculating a random weight coefficient to measure the intensity of random transformation of each CAN bus frame data in the real vehicle data; and correcting the standard deviation of Gaussian noise based on the activity of different types of data and the dependencies between data, thereby generating test data for V2X security fuzzy testing. This application aims to generate test data that conforms to the statistical laws of vehicle communication, thereby improving the data pass rate in the underlying protocol stack and thus more effectively testing the upper-layer business logic.

The present application relates to the field of biological medicine, and specifically provides an anti-LILRB4 monoclonal antibody injection preparation, which comprises an anti-LILRB4 monoclonal antibody, a buffer salt, a protein protective agent, and a surfactant, wherein the pH of the injection preparation is 5.5-6.5. The injection preparation provided by the present application provides a good storage environment for the anti-LILRB4 monoclonal antibody through the synergistic interaction of different contents of the buffer salt, the protein protective agent, and the surfactant, and guarantees the biological activity of the anti-LILRB4 monoclonal antibody. The anti-LILRB4 monoclonal antibody can effectively inhibit the combination of the LILRB4 antigen and its ligand complex, thereby blocking the interaction with the ligand ApoE complex, preventing the activation of the downstream NF-kappa B signal pathway and the release of ARG1, preventing the inhibition of T cell proliferation and the promotion of tissue infiltration, and can be used for treating cancer.

The utility model relates to the technical field of emulsion synthesis, in particular to emulsion synthesis waste gas purification treatment equipment which comprises a mounting box, a blending structure; the blending speed in the emulsion synthesis process is changed through the blending structure; the condensation structure is used for carrying out condensation treatment on waste gas generated in the emulsion synthesis process; according to the device, emulsion synthesis is carried out through the mounting box, the internal space of the mounting box is separated through the first separation plate and the two second separation plates, so that various materials for emulsion synthesis are respectively placed, the various synthetic materials can be in contact with one another through the plurality of circulation holes, the emulsion is more fully synthesized, and the generation rate of waste gas is reduced; the two condensation boxes are used for containing condensing agents, after waste gas is generated, the waste gas makes contact with the low-temperature condensation box, the waste gas is condensed, liquefied and returned to the installation box again to be synthesized, the waste gas is exhausted out of the installation box through the multiple exhaust pipes, meanwhile, the two condensation boxes are shielded through the two heat insulation plates, and waste of the condensing agents is reduced.

This invention proposes a gasoline antiknock agent, its preparation method, and its application, belonging to the field of antiknock agent technology. Palm oil is subjected to molecular distillation, and the secondary distillation product and undistilled substances are collected. The undistilled substances react with ethanol to obtain palm oil fatty acid ethyl esters. The secondary distillation product undergoes a saponification reaction with an alkali to obtain a saponified product, which is then added to water with a hydrophilic emulsifier to obtain an aqueous phase. A lipophilic emulsifier, methyl malonate, and palm oil fatty acid ethyl esters are added to the residual oil to obtain an oil phase. The aqueous phase is then added dropwise to the oil phase, emulsified, and filtered to obtain the gasoline antiknock agent. This gasoline antiknock agent achieves antiknock through the rapid vaporization of nano-water droplets. While providing antiknock protection, it also reduces cylinder temperature and exhaust emissions. Furthermore, its components are safe and environmentally friendly, non-polluting, non-toxic, easily degradable, and low-cost. It maintains good antiknock performance even at relatively low temperatures, indicating broad application prospects.

The invention discloses a molecular sieve catalyst for benzene alkylation, a preparation method and an application thereof. In the catalyst, the molecular sieve crystal contains three kinds of nearly spherical cavities with size distribution, and the diameter distribution range of the circles corresponding to the vertical projections of the three cavities from top to bottom is respectively within 10-30nm, 40-50nm and 60-90nm, and the proportion of the number of the three cavities is 20%-40%, 50%-75% and 5%-10%, respectively. The present invention prepares a molecular sieve catalyst containing cavities of suitable size and proportion inside the molecular sieve crystal in a more economical method, and the prepared catalyst is particularly suitable for the benzene alkylation process, and has high activity, selectivity and stability.

The application provides a medium-nickel ternary precursor, a preparation method and a positive electrode material. The preparation method of the medium-nickel ternary precursor comprises the following steps: (1) first seeds with a median particle size D50 of 0.5-1 mu m and second seeds with a median particle size D50 of 2-3 mu m are prepared by a coprecipitation method; (2) the first seeds are used, and a ternary metal salt solution, a precipitant solution and a complexing agent solution are fed in parallel to perform a first coprecipitation reaction to obtain an inner core; then the second seeds are used, and a second coprecipitation reaction is continuously performed to form a transition layer on the surface of the inner core; a third coprecipitation reaction is continuously performed to form an outer shell on the surface of the transition layer; and (3) the obtained product is filtered, washed and dried to obtain the medium-nickel ternary precursor. The positive electrode material prepared by the preparation method has the advantages that the lattice expansion and contraction stress under high voltage can be effectively buffered, microcracks and interface side reactions can be inhibited, and the positive electrode material has high compaction density and processing performance.

The invention discloses a method for producing substituted aromatics by alkylation, a catalyst and a preparation method thereof. The method for producing substituted aromatics by alkylation of the invention comprises: reacting raw materials aromatics and olefins by contacting with a molecular sieve catalyst to generate substituted aromatics; the molecular sieve crystals in the molecular sieve catalyst contain three kinds of nearly spherical cavities with size distributions, and the diameter distribution ranges of the circles corresponding to the vertical projections of the three cavities from top to bottom are within 5-35nm, 40-55nm and 60-100nm respectively. When the method of the invention is used for the alkylation reaction of benzene and ethylene to produce ethylbenzene, under the reaction conditions of high ethylene mass space velocity and low benzene to ethylene molar ratio, the ethylene conversion rate is greater than 99.9%, and the ethyl selectivity in the alkylation product is greater than 99.2%.

The utility model relates to foundry technology field especially relates to a vertical directional glass casting mould, it contains four identical size L type cast iron unit, L type cast iron unit is set up as cast iron piece of right angle bending. L type cast iron unit is through end point butt joint or overlapping nested and is pasted and constitutes the mould with longitudinal cavity to make glass liquid can flow in the height direction of pouring opening based on mould. The technical scheme presented in the application not only significantly improves the quality and efficiency of glass casting, but also reduces defects, improves the yield and performance of products. These improvements not only improve the overall quality of the product, but also provide a more reliable material basis for subsequent processing and application, with wide application prospect and significant economic benefits.

This application relates to the field of glass processing technology and discloses a method for controlling the heat treatment of tempered glass with low self-explosion and high stability. The method includes the following steps: float soda-lime silicate glass sheets are heated and softened, then rapidly quenched. When the core temperature drops to 395℃~405℃, the air pressure is reduced, and a water-based polymer atomized heat transfer modulator is sprayed in. The temperature drops to 320℃, with a cooling rate of 12.0~18.0℃ / min. The temperature is then further reduced to 310℃~320℃ and cooled to 40℃ with pure air. The float soda-lime silicate glass sheets are then placed in a forced convection hot-dip furnace and heated to 255℃~265℃ for alternating circulation. The frequency difference between the top and bottom circulating fans is controlled to generate an in-plane temperature difference and additional in-plane alternating stress in the float soda-lime silicate glass sheets. After the process, the glass is cooled down at the same frequency and removed from the furnace. This invention employs a technical solution of spraying a water-based polymer atomized heat transfer modulator while the glass core temperature is reduced to a specific range, thus effectively constraining the local cooling rate within a reasonable range.

This application provides a modified bismaleimide resin and its preparation method, the method comprising the following steps: S1: introducing an aromatic diamine, maleic anhydride, and a polar aprotic solvent into a plate-type silicon carbide microreactor to obtain a bismaleimide acid intermediate effluent; S2: introducing the bismaleimide acid intermediate effluent, a dehydrating agent, an organic weak base catalyst, and a transition metal salt co-catalyst into a first continuous flow tubular reactor to obtain a bismaleimide reaction solution; S3: introducing the bismaleimide reaction solution, an aryl-modified polysiloxane containing a cycloalkenyl side chain, a polymerization inhibitor, and supercritical carbon dioxide into a second continuous flow tubular reactor to obtain a modified bismaleimide prepolymer effluent; S4: introducing the modified bismaleimide prepolymer effluent into a high-pressure atomizing nozzle to obtain a modified bismaleimide resin.

The application relates to the technical field of fireproof flame-retardant materials, in particular to a self-extinguishing material, a preparation method and application. The self-extinguishing material is prepared by the preparation method. The preparation method comprises the following steps: preparing a fire extinguishing slurry; uniformly coating the fire extinguishing slurry on a porous flame-retardant foam material to obtain a fire extinguishing functional layer; wrapping a flame-retardant packaging layer, an elastic buffer layer and a corrosion and moisture prevention layer from inside to outside on the outer side of the fire extinguishing functional layer to obtain the self-extinguishing material. The application comprises the application of the self-extinguishing material in building fire prevention, new energy battery thermal runaway protection, electrical equipment fire prevention and / or closed space fire extinguishing. The self-extinguishing material prepared by the application can capture and consume combustion free radicals, and the self-extinguishing function is realized.

The invention relates to a flame-retardant smoke-suppression anticorrosive fiber material, a coating, a preparation method of the flame-retardant smoke-suppression anticorrosive fiber material and the coating containing the fiber material, and belongs to the technical field of functional coating materials. The preparation method of the fiber material comprises the following steps: (1) mixing and stirring a flame retardant, an organic solvent and a surfactant to obtain a core layer solution; (2) dispersing polyvinylidene fluoride-trifluoroethylene and inorganic nanoparticles in an organic solvent, and stirring to obtain a shell solution; and (3) simultaneously spinning the core layer solution and the shell layer solution to obtain the fiber material. After the coating of the fiber material is cured on the surface of a base material, a formed coating is a continuous fiber reinforced composite material and has flame-retardant, smoke-suppression, self-repairing and anti-corrosion properties at the same time. The inorganic nanoparticles are introduced into the shell layer and the thermal response type flame retardant is encapsulated in the core layer, so that the chemical activity or toxicity of harmful chemical substances is reduced through chemical adsorption, coordination binding and / or catalytic conversion under a fire or corrosion induction condition, and the flame-retardant smoke suppression, self-repairing and corrosion-resistant properties are synergistically realized.

The present application relates to the technical field of laser welding, and particularly relates to a collinear laser welding workstation based on modularization and a control method thereof, which comprises a base, a position moving unit used for carrying and moving aluminum plate to be welded, a laser welding unit used for emitting laser to a welding interface of the aluminum plate to form a molten pool, a monitoring unit used for monitoring the area of the welding interface, the burr quantity of the molten pool and the vibration intensity of the aluminum plate, and a control unit used for controlling the position moving unit and the laser welding unit to perform a welding test, and adjusting the laser welding temperature of the laser welding unit according to the area variation of the welding interface in the welding test, or correcting the target area of the welding interface according to the burr quantity of the molten pool, and adjusting the laser emission power according to the vibration intensity of the aluminum plate. The present application realizes the improvement of welding stability.

The invention discloses rolled copper foil for a flexible printed circuit board and a preparation method of the rolled copper foil. The rolled copper foil is prepared from the following components in percentage by mass: 0.002 to 0.005 percent of Ag, 0.01 to 0.1 percent of La, 0.01 to 0.05 percent of Ce, 0.05 to 0.25 percent of Nd, 0.01 to 0.1 percent of O and the balance of Cu and inevitable impurities. The rolled copper foil for the flexible printed circuit board solves the problems of low flexibility and high recrystallization temperature of the rolled copper foil for the flexible printed circuit board, and the comprehensive performance of the rolled copper foil is improved by optimizing new alloy components and a rolling process, so that the rolled copper foil is suitable for flexible and conductive circuit boards with high requirements.

The present invention discloses a multi-level key QKD transmission system and method based on wavelength division multiplexing, which belongs to the field of laser technology. The system includes Alice control terminal, pulse transmission line, information processing plate and Bob user terminal; Alice control terminal sends optical pulse train to information processing plate; the information processing plate encrypts information in blocks according to the importance, and then puts it into different optical fiber channels for transmission to Bob user terminal, each piece of information is assigned a separate key, and the high-level key can obtain the low-level key, which can improve the security of the system and the transmission efficiency; at the same time, an administrator key is generated; wherein, all information and keys are encrypted according to the corresponding key algorithm; in addition, the design of multi-level keys can further protect information from being eavesdropped, even if the low-level key is stolen, the remaining information can be protected, and it is difficult for an eavesdropper to obtain all the valid information, which is conducive to enhancing the confidentiality of the information.

The present invention belongs to the technical field of plate cutting, and in particular, relates to a plate cutting machine, comprising: a machine body; a step-by-step cutting mechanism, which is used to perform the cutting operation in sections so as to release the stress generated during the cutting process, wherein the step-by-step cutting mechanism comprises a lifting plate arranged above the machine body and displaced in the vertical direction, a support plate arranged below the lifting plate, two telescopic rods arranged between the support plate and the lifting plate, a cutting plate slidably connected to the bottom end of the support plate, and a driving assembly arranged between the lifting plate and the support plate. The present invention sets a step-by-step cutting mechanism, so that when cutting the plate, the cutting plate first moves downward with the lifting plate as a reference point, and then the lifting plate as the reference point can move downward under the action of the ratchet block and the ratchet plate, so that the plate is cut in steps, and the cutting depth is gradually increased, so that the plate and the cutting plate have time to release stress after each cutting, thereby reducing the concentration of internal stress.