43 results about "Expansion rate" patented technology

A negative electrode material, comprising composite particles. Each of the composite particles comprises a core and an amorphous carbon coating layer located on the surface of the core, wherein the core comprises a graphite framework and amorphous carbon in the graphite framework; and the amorphous carbon coating layer has a thickness of 10-50 nm. Raman spectral area scanning is performed on the negative electrode material, and there are 400 Raman spectral area scanning points; and the average ID / IG value of the Raman spectrum of the negative electrode material is 0.10-0.20, wherein the proportion of the number of scanning points having a single-point ID / IG value of less than 0.2 is greater than 60%. The negative electrode material has a high compaction density, a high capacity, a low expansion rate, good rate performance, and good high-temperature cycling performance.

The invention relates to the technical field of measurement work after tube expansion of a shell-and-tube heat exchanger, and discloses a tube hole measuring device and application, the tube hole measuring device comprises a shell, the shell is provided with a hollow cavity, at least three round holes used for placing steel balls are arranged along the peripheral wall of the shell, and the round holes are communicated with the hollow cavity of the shell; the steel balls are placed in the round holes; the center rod is arranged in the hollow cavity and moves in the axial direction of the hollow cavity, and one end of the center rod extends to the outer side of the shell; the part, located in the hollow cavity, of the center rod is a taper section. The farther the taper section is away from the center rod positioning ring, the smaller the diameter is. The expansion amount of the three steel balls is adjusted through displacement of the center rod with the taper, the measurement size is adjusted, and the diameter of the steel balls corresponding to the minimum value and the maximum value of the expansion rate is adjusted through the center rod positioning ring; the length of the expanded connection position is positioned through the shell positioning ring. When the expansion pipe hole is used, the measuring steel ball end with the minimum expansion rate can enter the expansion joint position, the measuring steel ball end with the maximum expansion rate cannot enter the expansion joint position, the expansion pipe hole is qualified, and otherwise, the expansion pipe hole is unqualified.

The invention belongs to the field of pipeline steel pipe manufacturing, and particularly relates to a plate shape detection device and method for a pre-bent straight seam steel pipe. The problems that an existing method is large in error and poor in practical application guiding effect are solved. The device comprises a supporting device, a guiding device, a moving device, a measuring device and a centering device. Calculating a theoretical inner radius based on the outer diameter of the steel pipe, the wall thickness of the steel plate and the steel pipe expanding rate; obtaining two-dimensional contour data of the pre-bent plate shape based on a measuring device; calculating the pre-bending angle of the steel pipe; calculating coordinates of a third coordinate point and a fourth coordinate point; further calculating the coordinates of the circle center, and determining a second coordinate point based on the coordinates of the circle center and the two-dimensional contour data; calculating a first measurement radius of the pre-bent plate edge arc based on the coordinate of the circle center and the coordinate of the fourth coordinate point; and then judging whether process adjustment is needed. According to the invention, the online detection of the pre-bent plate shape quality is realized, the actual production demand is met, and the error is small.

The utility model relates to the technical field of machining workpiece measurement, in particular to a perpendicularity measuring device for a hole expansion rate sample. A perpendicularity measuring device for a hole expansion rate sample comprises a mounting base, a measuring supporting rod and a measuring part, the mounting base is provided with a sample mounting position, the sample mounting position is provided with a positioning piece, the positioning piece is used for fixing the position of the sample on the sample mounting position, and the measuring supporting rod is arranged in the range of the sample mounting position. The measuring part comprises a measuring piece, a first adjusting piece and a second adjusting piece, the first adjusting piece is used for adjusting the position of the measuring piece in the extending direction of the sample pore channel, and the second adjusting piece is used for adjusting the distance between the measuring end of the measuring piece and the inner wall of the sample pore channel. The size change is small for single-specification and batch manufacturing, timely detection can be achieved after each batch of samples is machined, and the measuring device is simple, easy to manufacture, low in cost and high in measuring precision.

The invention provides a method for estimating thermal expansion molding process parameters of a foam sandwich composite material, the foam sandwich composite material and a preparation method of the foam sandwich composite material. The estimation method comprises the following steps: testing an expansion pressure-time relation curve of the expandable foam rubber under the conditions of different temperatures and different expansion rates, and when the maximum value of the expansion pressure exceeds 100 kPa, recording a corresponding expansion rate range and a temperature range; testing a viscosity-curing time relation curve of resin in the prepreg at different temperatures, and recording a corresponding temperature range when the curing time does not exceed 10 minutes and the viscosity is not lower than 100 Pa.s; and taking the overlapped part of the recorded temperature range of the expandable foam rubber and the recorded temperature range of the resin as an estimated temperature range of thermal expansion mold pressing, and taking the recorded expansion rate range as an estimated expansion rate range of a thermal expansion mold pressing process. According to the estimation method, the production process stability of the sandwich composite material is improved.

The invention discloses a complex structure casting resin sand gravity casting liquid weight calculation method, and relates to the technical field of equipment manufacturing, and the method comprises the following steps: building a casting part finished product three-dimensional model; the machining allowance grade is determined according to the nominal size of the part finished product three-dimensional model, and the part finished product three-dimensional model is adjusted based on the machining allowance grade to obtain a process blank model; designing a pouring pipeline model and a riser model; obtaining the volume of each model based on three-dimensional design software; selecting a reasonable volume shrinkage rate epsilon v according to the element content in the raw material molten steel; obtaining a resin sand box expansion rate fv based on measured data; correcting the volume of the process blank model based on the volume shrinkage rate epsilon v and the resin sand box expansion rate fv; and the mass of molten iron needed for pouring is calculated based on the volume of each model. According to the method, the residual molten steel is smaller than or equal to 4%, the yield is 50% or above, the material utilization rate is synchronously increased by 3-10%, cost reduction, energy conservation and zero test are achieved, and the problem that molten steel raw materials are wasted during gravity casting of complex-structure casting resin sand is solved.

The present invention discloses a method for manufacturing an inner pot (30) of a non-stick pot, comprising the steps of: providing a metal plate material having at least an outer metal layer (321), a heat-soaking layer (322), and an inner metal layer (323); etching, engraving, or pressing the inner metal layer (323) to form an anti-stick array (33) including a plurality of grooves or protrusions; stretching the metal plate material with the anti-stick array (33) by controlling the tensile rate to manufacture the inner pot (30); or stretching the metal plate material with the anti-stick array (33) by controlling the tensile rate to produce an inner pot blank (S04); and adjusting the expansion rate. and (S06) manufacturing the inner pot (30) by controlling the expansion of the inner pot blank. The thickness ratio between the side wall and the bottom wall of the manufactured inner pot (30) is 0.9 to 1.1, and the thickness ratio between the outer metal layer (321) and the inner metal layer (323) is 0.6 to 1.4, so that the grooves or protrusions deformed by tension in the anti-stick array (33) are within a predetermined range, and the area change of the area where the grooves or protrusions are located is within a controllable range, so that the rice and the anti-stick array (33) on the side wall of the inner pot (30) are in excellent contact with each other.

This invention discloses a high-strength particleboard and its preparation method, belonging to the field of particleboard production technology. The high-strength particleboard includes an upper surface layer, a core layer, and a lower surface layer. Its key feature is that the lower and upper surface layers are laid in a gradient pattern. The beneficial effects of this invention are: using two types of wood chips of different sizes, shapes, and moisture contents, mixed with adhesive to prepare the core layer, forming a homogeneous structure of core layer wood chips; employing a method of mixing adhesive first and then blending materials, separately mixing the adhesive improves the expansion rate of the wood chips after water absorption, thereby obtaining a homogeneous core layer structure with uniformly mixed wood chips of different sizes. The high-strength particleboard has high strength and good physical and mechanical properties, with high internal bond strength, static bending strength, elastic modulus, and screw holding force.

The invention discloses a method for collecting and testing slow expansion force, which comprises the following steps of: filling an expansion body material into a thin-wall metal tank, injecting an absorption medium, placing an amorphous thin-wall metal tank into a liquid medium, transferring mechanical force generated by expansion of the expansion body material to the liquid medium through the amorphous thin-wall metal tank, and converting the mechanical force into hydraulic force for measurement. And slow expansion force data is obtained. By adopting the innovative process method, the pressure vessel is uniformly stressed, the acquired data is accurate and reliable, the test is continuous, the operation is simple, and the universality is high. On the premise of ensuring low cost, energy conservation and environmental protection, the expansion pressure corresponding to the volume expansion rate of various slow expansion materials under different media and different temperatures can be tested, and actual data support is provided for the slow expansion materials in engineering application.

The invention relates to the technical field of material analysis, and discloses a wire cold bending crack resistance evaluation method and device, electronic equipment and a storage medium, and the method comprises the steps: obtaining the radial stress and shear stress of a preset test point under each bending degree when a target wire is subjected to symmetric cold bending according to different bending degrees, determining the key bending degree based on the shear stress, and determining the bending degree of the target wire according to the key bending degree; determining a shear stress influence factor according to the shear stress corresponding to the key bending degree, determining a radial stress influence factor according to the radial stress corresponding to the initial bending degree, the tail end bending degree and the later bending degree, and determining cold bending crack resistance parameters of the target wire according to the shear stress influence factor and the radial stress influence factor. The method can break through the limitation that the existing standard only judges whether the crack exists or not, realizes full-dimension quantitative evaluation of the crack initiation tendency, the expansion direction and the expansion rate of the wire material, covers the core key index of the cold bending crack resistance, and improves the accuracy of wire material quality evaluation.

The application provides a ceramic tile with granite texture and a preparation method thereof, which comprises four steps of preparation, glazing, inkjet and sintering. The alumina-zirconia composite fiber subjected to surface modification treatment is made into glaze slurry, the glaze slurry is applied to a first body prepared by pressing ceramic tile powder, and the ink is sprayed on the ceramic tile body by an inkjet machine and sintered. After that, the specific surface area of the composite fiber is significantly increased by the difference in expansion rates of alumina and zirconia, the number of self-binding sites is increased, a three-dimensional connecting interface is formed between the glaze and the body during sintering, the binding sites in the glaze improve the anchoring strength of the ink, the binding force between the ink and the glaze layer is significantly enhanced, the wear resistance and mechanical properties of the big grain pattern layer are improved, the wear and scratches during use are reduced, the service life of the ceramic tile is prolonged, the use experience of the user is improved, and the method has the advantages of simple preparation process, wide application range and easy popularization and implementation.

This disclosure relates to the field of expansion rate testing technology. One embodiment of this disclosure provides a free expansion rate tester, which includes: a placement tray, a feeding hood disposed on the upper surface of the placement tray, a vibrating feeding component disposed on the feeding hood, and a collection and cleaning component disposed on the placement tray; the vibrating feeding component includes an extension block, a drive motor disposed on a mounting frame, a drive shaft disposed at the output end of the drive motor, and a stirring blade disposed on the drive shaft, the stirring blade being embedded inside the feeding hood. This technical solution solves the problem of manual operation methods in the prior art, such as manually pouring materials and mixing based on experience, which are not only inefficient but also prone to large deviations and poor repeatability in test results due to human factors. Furthermore, in the material feeding stage, it is difficult to ensure consistent feeding speed, quantity, and uniformity each time, which greatly interferes with the accuracy of subsequent expansion tests.

A negative electrode composite material includes a Si-M-C composite material. A conductive layer exists on a surface of the Si-M-C composite material, M includes at least one of boron, nitrogen, or oxygen. Chemical shifts of a silicon element in the Si-M-C composite material as measured in a solid-state nuclear magnetic resonance test include −5 ppm±5 ppm, −35 ppm±5 ppm, −75 ppm±5 ppm, −110 ppm±5 ppm. A peak width at half height at −5 ppm±5 ppm is K, and K satisfies: 7 ppm<K<28 ppm. The negative electrode composite material exhibits a relatively low expansion rate and a relatively high conductivity. A negative electrode plate and an electrochemical device made of the negative electrode composite material exhibit high cycle performance.

The preparation mold of the sealing element comprises an upper mold and a lower mold, at least two containing cavities are formed after the upper mold and the lower mold are closed, the upper mold comprises a first forming face, the lower mold comprises a second forming face, at least part of the first forming face forms at least part of the upper wall face of the containing cavity, and at least part of the second forming face forms at least part of the lower wall face of the containing cavity. At least part of the second forming surface forms at least part of the lower wall surface of the accommodating cavity; the containing cavity comprises a first containing cavity body and a second containing cavity body, the first containing cavity body extends in an arch shape, the second containing cavity body is located on the periphery of at least part of the first containing cavity body, and the first containing cavity body is communicated with the second containing cavity body. A certain extension space is reserved between the two different materials, material wrinkles caused by different expansion rates of the materials after temperature rise in the machining process are reduced, and the forming yield of the sealing element can be improved.

The embodiment of the invention provides a device and a method for testing the expansion rate of a swellable alloy, and belongs to the field of expansion rate testing. The test device comprises: a reaction chamber comprising a sample chamber and a piston rod, the sample chamber having a hollow cavity for accommodating a swellable alloy, one end of the piston rod being in contact with the swellable alloy to move in response to the expansion of the swellable alloy; the electrochemical workstation comprises a counter electrode and a working electrode which are positioned in the reaction solution, the working electrode is fixed at the other end of the piston rod, and the electrochemical workstation is used for acquiring a resistance value between the working electrode and the counter electrode; and the processor is used for determining the expansion rate of the swellable alloy according to the resistance value acquired by the electrochemical workstation. The testing device can meet real-time monitoring of the expansion coefficient of the swellable alloy in the high-temperature and high-pressure environment, and can simply and efficiently measure the expansion coefficient of the swellable alloy in different set temperature and set pressure environments.

This invention discloses a method and apparatus for determining the expansion rate of steel slag asphalt mixture based on image processing, comprising: acquiring visual morphology data of steel slag asphalt mixture specimens during the expansion process according to a preset time sequence, wherein the visual morphology data includes a sequence of images that at least reflect the surface contour and steel slag particle distribution of the steel slag asphalt mixture specimens; determining characteristic parameters characterizing the expansion state of the steel slag asphalt mixture specimens using a computer vision algorithm based on the visual morphology data, wherein the computer vision algorithm includes at least image denoising, geometric correction, and target region segmentation; and calculating the expansion rate of the steel slag asphalt mixture specimens based on the characteristic parameters and a pre-established mapping relationship between pixel space and physical space.

The application provides a preparation method of a glass with different thicknesses, comprising the following steps: performing a first strengthening treatment on a glass substrate to obtain a first pretreated glass, wherein the glass substrate comprises a first part and a second part adjacent to the first part, the thickness of the first part is less than the thickness of the second part; performing a first etching treatment on the first part after the first strengthening treatment to thin the first part, to obtain a second pretreated glass, the volume expansion rate of the first part after the first strengthening treatment and the first etching treatment is less than the volume expansion rate of the second part; performing a second strengthening treatment on the second pretreated glass to obtain a third pretreated glass; and performing a second etching treatment on the third pretreated glass to obtain a glass with different thicknesses, wherein the glass with different thicknesses comprises a first strengthened part obtained from the first part and a second strengthened part obtained from the second part, the thickness of the first strengthened part is less than the thickness of the second strengthened part, and the peak-to-valley value of the surface of the first strengthened part is less than or equal to 0.1 mm. The application also provides a glass with different thicknesses and a foldable electronic device.

This invention provides a composite board, furniture, and door panel. The composite board includes a substrate and a ceramic substrate. The substrate has a first surface and a second surface. The ceramic slab is attached to the first surface of the substrate. The ratio of the water absorption thickness expansion rate of the substrate to that of the ceramic slab is in the range of 0.05 to 20. Because the ceramic slab is attached to the surface of the substrate, it can prevent scratches or cracks from appearing on the surface of the composite board. Furthermore, since the ratio of the water absorption thickness expansion rate of the substrate to that of the ceramic slab is in the range of 0.05 to 20, that is, the ratio of the water absorption thickness expansion rate of the substrate and the ceramic slab is small, it can avoid the composite board from delamination and breakage caused by cooling water during the cutting process.

The application discloses a production system for concrete grouting material, and relates to the technical field of grouting material production.The production system comprises a raw material mixing box and a grouting material packing table, a mounting rod is fixed on the top of the grouting material packing table, a quantitative discharging box is mounted on one side of the upper end of the mounting rod, a spiral conveyor is arranged between the raw material mixing box and the quantitative discharging box, the feeding end of the spiral conveyor is communicated with the discharging opening of the raw material mixing box, and the discharging end is inclined upward and communicated with the feeding opening of the quantitative discharging box.The application can detect the expansion rate of the grouting material by adding a part of the grouting material into the detection box until the grouting material overflows, smoothing the top, covering the detection box with a glass plate, adjusting the dial gauge until the probe of the dial gauge is against the glass plate, rotating the detection box until the detection box is located directly above the detection plate, opening the blocking plate when the grouting material solidifies, and making the solidified grouting material fall on the detection plate, and then the hardness of the solidified grouting material is tested by the hydraulic cylinder.

The invention provides a high-strength moisture-proof medium-density fiber artificial board and a preparation method thereof, and belongs to the technical field of artificial board manufacturing and composite materials. The high-strength moisture-proof medium-density fiber artificial board is prepared from the following raw materials in parts by weight: 70-90 parts of wood fibers, 3-8 parts of surface modified reinforced fibers, 10-15 parts of an isocyanate adhesive, 2-5 parts of a moisture-proof agent, 1-4 parts of nano silicon dioxide, 1-4 parts of an interfacial compatible flame retardant and 1-3 parts of a curing agent. The board is endowed with extremely low water absorption thickness swelling rate, high strength, excellent moisture resistance and good flame retardance through the synergism of all the components, the board is suitable for a high-humidity environment, uniform dispersion and sufficient curing of the components are ensured by adopting a step-by-step sizing and mixing process and cooperating with a two-stage hot pressing process, the uniformity and stability of product performance are ensured, and the board is suitable for being used in a high-humidity environment. The common problems of agglomeration, non-uniform dispersion and the like of a multi-component composite system are solved.

The application discloses a kind of slow expansion force acquisition test methods, and the expansion body material is loaded into thin-walled metal tank and injected into absorption medium, and then amorphous thin-walled metal tank is placed in liquid medium, the mechanical force generated by expansion of expansion body material is transmitted to liquid medium through amorphous thin-walled metal tank, and is converted into hydraulic pressure to be measured, and slow expansion force data is obtained.The application adopts innovative process method, pressure vessel is stressed evenly, data acquisition is accurate and reliable, test is continuous, operation is simple, and is widely used.In the premise of ensuring low cost, energy saving and environmental protection, the volume expansion rate corresponding to the expansion pressure of various slow expansion materials under different media and different temperatures can be tested, and practical data support is provided for slow expansion materials in engineering application.

The present application belongs to the technical field of cast iron alloy, and particularly relates to a low-expansion rate nodular cast iron and a preparation method thereof. The nodular cast iron is composed of a nodular cast iron matrix and specific additives, and low thermal expansion and high dimensional stability are realized by strictly controlling the equivalent proportion of carbon, silicon, molybdenum, chromium and other elements. The preparation method comprises the steps of melting, deoxidation and inoculation, spheroidizing treatment, controlled cooling pouring, annealing and aging heat treatment, and the like, and equiaxed fine crystal graphite ball distribution and ferrite-pearlite composite matrix structure are obtained by combining multi-stage temperature control and microalloy strengthening technology. The nodular cast iron is suitable for manufacturing large high-precision platforms or structural parts with high thermal stability requirements.

The invention relates to a phase change material and a phase change water heater. Specifically, the phase change material of the present invention comprises: a phase change main material; a thickening agent; a nucleating agent and an expansion coefficient regulator; wherein the expansion coefficient regulator can regulate the expansion rate of the phase change material, so that the pressure of the phase change material on the stainless steel container containing the phase change material in the phase change process is within a preset pressure range. According to the present invention, the phase change material has an adjustable expansion rate, can stably exhibit excellent life characteristics, and protects the stability of a stainless steel container.

The present application belongs to the technical field of comprehensive utilization of solid waste, and particularly relates to a method for resource utilization and quality grading of road steel slag aggregate, which comprises the following steps: step 1, obtaining multiple grades of steel slag aggregate by aging, crushing and screening the steel slag, and obtaining an expansion strain field gray image time sequence; step 2, extracting images at multiple time points from the expansion strain field gray image time sequence, stacking the images into a multi-channel input tensor, and inputting the tensor into a convolutional neural network model to output probability values of three grades of stability, i.e., excellent stability, medium stability and poor stability; and step 3, determining the mechanical durability index of each grade of steel slag aggregate with a continuous stability score reaching a set threshold value, and preparing each grade of steel slag aggregate into building materials corresponding to the road layer position. The present application breaks through the limitation of traditional autoclaved expansion rate method which only outputs a single scalar value, and realizes high-dimensional characterization of the expansion space distribution pattern and time sequence evolution pattern.

The present invention relates to the technical field of inductor preparation, it relates to a kind of inductor and baking temperature control method thereof, including an inductor formed by preparing a composite material, baking the sample to obtain the temperature range of interface cracks: copper wire and magnetic material are subjected to TMA test by TMA instrument, and the expansion data of copper wire and magnetic material are recorded respectively, and the expansion data of both are derived to draw a curve of temperature and expansion rate, in the linear region of material expansion behavior, the relationship between expansion rate and temperature is fitted using linear regression method to obtain a linear equation. The linear equation is calculated to obtain the temperature node corresponding to the same thermal expansion coefficient, so as to regulate the drying temperature and time of the product according to the temperature node. According to the TMA curves of different magnetic materials, a baking method can be formulated in a targeted manner to achieve the purpose of comprehensive improvement, and the improvement method is simple, without the need to improve from the material end and the mechanism end, and the execution difficulty is low.

The utility model discloses a device for detecting the expansion rate of a concrete expansive agent, which comprises a machine body, an operating room is arranged in the machine body, a supporting table is arranged in the operating room, a moving mechanism is arranged on the supporting table, a placing plate for placing a test block is arranged on the moving mechanism, and a clamping mechanism is arranged on the placing plate. First laser range finders are arranged on the two inner side walls of the operation chamber, the first laser range finders on the two side walls emit laser towards the direction where the containing plate is located, the laser emitting centers are located on the same straight line, a second laser range finder is arranged on the top wall in the operation chamber, and the second laser range finder emits laser downwards. According to the utility model, the laser range finder is used for detecting the test block, so that a worker does not need to carry out repeated tests for many times, the detection steps are relatively simple, and the detection result is more accurate. Meanwhile, the test block is not influenced by external force, and the measured shrinkage or swelling amount is small in error.

The invention relates to the field of geotechnical engineering, in particular to an expansion testing device for expansible mudstone and an expansion characteristic modeling method.The device comprises a sealed box, a fixed assembly, a movable assembly and a measuring assembly, an expansible mudstone sample is arranged between the fixed assembly and the movable assembly, and the environment humidity is adjusted through a humidity control system in the sealed box; the displacement variation and the pressure variation of the sample in the expansion process are measured in real time through a displacement sensor and a pressure sensor; then, an expansion rate-water content relation model, an expansive force-water content relation model and an expansive force-expansion rate relation model are constructed through time sequence data, finally, a comprehensive model is formed by combining the three models, model parameters are optimized through an objective function, and accurate modeling of the expansive mudstone expansion characteristics is achieved. Therefore, the complex relationship among the water content, the expansion rate and the expansion force is reflected.

The invention belongs to the field of civil construction engineering, and particularly relates to a design and construction technology of a concrete-filled steel tube structure, in particular to a method for determining an expansion rate limit value of concrete in a concrete-filled steel tube structure and a storage medium. And the selection of the expansion rate is converted from empirical and qualitative judgment to quantitative and scientific design based on a mechanical model. According to the scheme, the expansion characteristic of the concrete material and the strength safety of the steel pipe structure are linked through a rigorous mechanical model for the first time, and the crossing from the empirical material ratio to the quantitative design based on the structural system performance is realized. And a key theoretical tool and a design basis are provided for solving the problem of how to reasonably use the expanding agent, which puzzles the engineering for a long time.

This invention relates to a nano-metakaolin-modified hydraulic lime-based composite material and its preparation and application. The composite material comprises natural hydraulic lime and nano-metakaolin dispersed in the natural hydraulic lime, wherein the mass ratio of natural hydraulic lime to nano-metakaolin is (60-90):(10-40). The nano-metakaolin-modified hydraulic lime-based composite material of this invention exhibits controllable dispersibility and fluidity in the slurry after mixing with water. It also demonstrates good rock compatibility, low soluble salt content, controllable curing time, suitable post-curing strength, low permeability, and low shrinkage and expansion rate. The presence of a repair agent can specifically enhance the additional protective performance of the reinforcement material. It possesses high applicability, safety, and durability for the protection of stone cultural relics, without causing derivative damage.

The invention discloses a rolling mill stand resin sand gravity casting liquid weight calculation method, and relates to the technical field of equipment manufacturing, and the method comprises the following steps: selecting the linear shrinkage rate epsilon L of a casting in different directions according to the wall thickness and length of the casting; obtaining a resin sand box expansion rate fv based on measured data; adjusting the process blank model based on the linear shrinkage rate epsilon L and the resin sand box expansion rate fv; a pouring pipeline model and a riser model are designed based on the process blank model, and the volume of the process blank model, the volume of a pouring pipeline and the volume of a riser are obtained based on three-dimensional design software; and calculating the mass of molten iron required for pouring based on the adjusted volume of the process blank model, the volume of the pouring pipeline and the volume of the riser. According to the method, epsilon L and fv are obtained through a standardization method, cost reduction, energy conservation and zero mold testing are achieved, and the problems that in an existing rolling mill stand resin sand gravity casting technology, the precision of an empirical coefficient method is low, the difference of linear shrinkage in different directions is not considered, the box expansion rate is not quantized, and the accuracy is poor are solved.