Method for evaluating the material utilization of a plaster model material for sanitary ceramics and use thereof

Abstract

The application discloses a kind of sanitary ceramic gypsum model material utilization rate evaluation method and its application, belong to sanitary ceramic gypsum model simulation design field, establish three-dimensional model of gypsum material and carry out networked processing to it;Boundary condition parameters are set, and its stress distribution is analyzed and obtained, and according to the stress distribution of finite element analysis, the gypsum model is partitioned;The material utilization rate of gypsum model is calculated using the volume ratio of each sub-region and stress distribution.The application adopts finite element analysis stress distribution and partitions gypsum model, according to the size of stress, the three-dimensional model of gypsum material is divided into several subintervals, the material utilization rate of each interval is calculated and summarized, the material utilization rate of entire three-dimensional model is obtained, for evaluating three-dimensional model structure, realizes the quantitative evaluation of three-dimensional model structure of gypsum material, provides clear and feasible idea for optimizing three-dimensional model structure of gypsum material in direction.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of plaster model simulation design for sanitary ceramics, in particular, relates to a method for evaluating the material utilization rate of a plaster model for sanitary ceramics and its application in the structural optimization of a plaster model. BACKGROUND

[0002] Ceramic production mainly relies on plaster models for production and manufacturing. Plaster is relatively expensive, and the thickness of the current plaster model is generally around 60-80mm. The main reason for this is that a thin plaster model has poor strength and is easily damaged. A thick plaster model not only wastes plaster but also increases the strength of the handling. In addition, a thick plaster model requires more heat energy for drying during production and use, and the water content of the model also needs to be controlled to ensure its normal use, which consumes a large amount of electricity and gas resources. Thick plaster models generate more solid waste when they are discarded, and the storage and disposal of thick plaster waste is more likely to produce dust, affecting the environment and greatly increasing environmental protection costs.

[0003] Therefore, it is an urgent problem to scientifically and systematically study the thickness and structural stress of different parts of the plaster model on the basis of meeting production needs, and to optimize the structure of the plaster model by local adjustment to reduce the amount of plaster used. SUMMARY

[0004] To overcome the problem of how to optimize the structure of the plaster model and reduce the amount of plaster used while taking into account the thickness and structural stress of different parts of the plaster model in the production of ceramic products relying on plaster models, the present application provides a method for evaluating the material utilization rate of a plaster model for sanitary ceramics and its application. The material utilization rate is used to evaluate the structure of the plaster model for sanitary ceramics, quickly understand the stress conditions of different parts of the plaster model, and optimize its structure accordingly to remove unnecessary structures and reduce the amount of plaster used, thereby achieving the purpose of optimizing the structure of the plaster model. The specific technical solutions are as follows:

[0005] A method for evaluating the material utilization rate of a plaster model for sanitary ceramics, comprising the following steps:

[0006] Step 1: Establish a three-dimensional model of the plaster material and perform network processing on the three-dimensional model of the plaster material.

[0007] Step 2: Set the boundary condition parameters of the three-dimensional model of the plaster material, analyze and obtain the stress distribution of the three-dimensional model of the plaster material, and divide the stress range [0, [σ]] into m subintervals according to the stress distribution of the finite element analysis and the partitioning of the plaster model: Then the three-dimensional model of the gypsum material is divided into m sub-regions according to the stress range of the interval, wherein [σ] is the allowable stress;

[0008] Step three, the volume ratio of the m sub-regions to the total volume is V1, V2, V3……V m , the percentage of the kth sub-region in the total volume is V k , the upper limit of the stress of the kth sub-region is [σ k ], and the material utilization rate of the kth sub-region is:

[0009]

[0010] Step four, the material utilization rate of the entire gypsum material three-dimensional model is:

[0011]

[0012] It can be seen that the material utilization rate is related to the volume ratio of each sub-region to the total volume, and also related to the number of partitions and the stress upper limit value of the sub-region, that is, the lower the upper limit value, the higher the ranking, indicating that the material utilization rate is smaller, and the smaller the volume ratio of each sub-region to the total volume, the smaller the material utilization rate. Since the sum of the volume ratios of all sub-regions to the total volume is 1, in order to improve the material utilization rate of the entire gypsum material three-dimensional model, the volume ratio of the sub-region with high ranking should not be too large, which is also the optimization direction of the gypsum material three-dimensional model.

[0013] The stress distribution is analyzed by using finite element analysis, and the gypsum model is partitioned. The three-dimensional model of the gypsum material is divided into several sub-intervals according to the stress size. The material utilization rate of each interval is calculated and summarized to obtain the material utilization rate of the entire gypsum material three-dimensional model, which is used to evaluate the structure of the gypsum material three-dimensional model, and realizes the quantitative evaluation of the structure of the gypsum material three-dimensional model. It provides a clear and feasible idea for optimizing the gypsum material three-dimensional model structure in a directional manner.

[0014] Preferably, the boundary condition parameters include applying clamping force to one side of the gypsum material three-dimensional model, constraining the horizontal degree of freedom on the other side, constraining the Z-axis displacement, constraining the X-axis and Y-axis displacement, applying gravity, and applying mud pressure inside.

[0015] The boundary condition parameters of the gypsum material three-dimensional model are set to simulate the actual stress condition of the gypsum material three-dimensional model in the ideal state, so as to analyze and obtain the stress distribution of the gypsum material three-dimensional model, which provides conditions for evaluating and optimizing the gypsum material three-dimensional model according to the stress distribution of the gypsum material three-dimensional model.

[0016] Here, the constraint condition of the gypsum material three-dimensional model is set, that is, it is assumed that there is no gap between the gypsum models which are closely fitted; and the contact condition between the model blocks adopts frictional contact.

[0017] Preferably, the clamping force applied to one side of the gypsum material three-dimensional model is Wherein F is the force applied by the person, L is the force arm, k is the torque coefficient, and d is the outer diameter of the threaded rod.

[0018] Preferably, the gravity is applied according to the production inclination angle (9°-17°), and the production inclination angle is preferably 13°.

[0019] Preferably, when the mud pressure is applied inside, the pressure applied by the mud is controlled according to the height difference between the mud liquid level in the head tank and the fixed point in the inner cavity.

[0020] Preferably, in step one, the grid size is 10mm when network processing, and the single unit spans an angle value of 36° along the curvature.

[0021] Preferably, in step two, the ultimate tensile stress is determined according to the three-point bending experiment:

[0022]

[0023] Wherein Fmax is the breaking load, L is the span, b is the width, and h is the thickness;

[0024] The allowable stress of the gypsum model under tensile stress is [σ]=σ lim / n;

[0025] Wherein n is the safety factor, and 1<n<2, and n is preferably 1.5.

[0026] Preferably, before establishing the three-dimensional model of the gypsum material in step one, the density, elastic modulus and friction coefficient between the gypsum materials are collected first, and the Poisson's ratio of the gypsum material for sanitary ceramics is set.

[0027] The application also provides an application of a method for evaluating the utilization rate of a gypsum model material for sanitary ceramics in the optimization of a gypsum model structure.

[0028] By optimizing the structure of the area with high volume and low utilization rate, the area with high volume and low utilization rate is avoided as much as possible, so that the material utilization rate of the gypsum material three-dimensional model is effectively improved.

[0029] Preferably, according to the stress distribution of each area of the gypsum material three-dimensional model and the material utilization rate of each area, the structure of the area with high volume and low utilization rate is optimized to obtain an optimized gypsum material three-dimensional model.

[0030] The material utilization rate of the gypsum material three-dimensional model after calculation is compared with the material utilization rate of the gypsum material three-dimensional model before optimization, and when the material utilization rate after optimization is greater than the material utilization rate before optimization, it is indicated that the structure optimization is reasonable, otherwise the structure optimization is unreasonable.

[0031] The beneficial effects of the technical scheme of the present application are as follows:

[0032] (1) The stress distribution is analyzed by using finite element analysis, and the gypsum model is divided into zones, the gypsum material three-dimensional model is divided into several subintervals according to the stress size, the material utilization rate of each interval is calculated and summarized, and the material utilization rate of the entire gypsum material three-dimensional model is obtained, which is used for evaluating the structure of the gypsum material three-dimensional model, realizing the quantitative evaluation of the structure of the gypsum material three-dimensional model, and providing a clear and feasible idea for optimizing the gypsum material three-dimensional model in a directional manner.

[0033] (2) The boundary condition parameters of the gypsum material three-dimensional model are set, the actual stress condition of the gypsum material three-dimensional model in the ideal state is simulated, so as to analyze and obtain the stress distribution of the gypsum material three-dimensional model, and provide conditions for evaluating and optimizing the gypsum material three-dimensional model according to the stress distribution of the gypsum material three-dimensional model.

[0034] (3) The structure of the region with high volume and low utilization rate is optimized, and the region with high volume and low utilization rate is avoided as much as possible, so as to effectively improve the material utilization rate of the gypsum material three-dimensional model. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments, and it should be understood that the following drawings only show some embodiments of the present application, and should not be regarded as a limitation to the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor.

[0036] Figure 1 is a pressure displacement curve diagram in the preferred three-point bending test of the present application;

[0037] Figure 2 is a three-dimensional structure diagram of the gypsum material three-dimensional model before optimization of the present application;

[0038] Figure 3 is a three-dimensional structure diagram of the gypsum material three-dimensional model after meshing processing before optimization of the present application;

[0039] Figure 4 is a boundary condition parameter setting schematic diagram of the gypsum material three-dimensional model before optimization of the present application;

[0040] Figure 5is a preferred stress distribution diagram of a three-dimensional model of a gypsum material before optimization of the present application;

[0041] Figure 6 is a preferred stress distribution area division result diagram of a three-dimensional model of a gypsum material before optimization of the present application;

[0042] Figure 7 is a preferred volume derivation result diagram of each area of a three-dimensional model of a gypsum material before optimization of the present application;

[0043] Figure 8 is a preferred volume statistics diagram of each stress area of a three-dimensional model of a gypsum material before optimization of the present application;

[0044] Figure 9 is a preferred structure comparison diagram of a three-dimensional model of a gypsum material before and after optimization of the present application. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments of the present application. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0046] The embodiments of the present application use finite element analysis stress distribution and divide the gypsum model, divide the three-dimensional model of the gypsum material into several subintervals according to the stress size, calculate the material utilization rate of each interval and summarize to obtain the material utilization rate of the entire three-dimensional model of the gypsum material, which is used for evaluating the structure of the three-dimensional model of the gypsum material, realizes the quantitative evaluation of the structure of the three-dimensional model of the gypsum material, and provides a clear and feasible idea for optimizing the structure of the three-dimensional model of the gypsum material in a directional manner.

[0047] The specific scheme is as follows:

[0048] A method for evaluating the material utilization rate of a sanitary ceramic gypsum model material, comprising the following steps:

[0049] Step one, establishing a three-dimensional model of a gypsum material, and performing network processing on the three-dimensional model of the gypsum material;

[0050] Step two, set the boundary condition parameters of the gypsum material three-dimensional model, analyze and obtain the stress distribution of the gypsum material three-dimensional model, and divide the gypsum model according to the finite element analysis stress distribution, and divide the stress range [0, [σ]] into m subintervals: Then, according to the stress range of the interval, the gypsum material three-dimensional model is divided into m sub-regions, wherein [σ] is the allowable stress;

[0051] Step three, the volume ratio of the m sub-regions to the total volume is V1, V2, V3……V m , the percentage of the kth sub-region in the total volume is V k , the upper limit of the stress of the kth sub-region is [σ k ], and the material utilization rate of the kth sub-region is:

[0052]

[0053] Step four, the material utilization rate of the entire gypsum material three-dimensional model is:

[0054]

[0055] It can be seen here that the material utilization rate is related to the volume ratio of each sub-region to the total volume, and also related to the number of partitions and the upper limit value of the stress of the sub-region, that is, the lower the upper limit value, the earlier the sorting, indicating that the material utilization rate is smaller, and the smaller the volume ratio of each sub-region to the total volume, the smaller the material utilization rate. Since the sum of the volume ratios of all sub-regions to the total volume is 1, in order to improve the material utilization rate of the entire gypsum material three-dimensional model, the volume ratio of the sub-region with earlier sorting to the total volume should not be too large, which is also the optimization direction of the gypsum material three-dimensional model.

[0056] Among them, the boundary condition parameters include applying clamping force to one side of the gypsum material three-dimensional model, constraining the horizontal degree of freedom on the other side, constraining the Z-axis displacement, constraining the X-axis and Y-axis displacement, applying gravity, and applying mud pressure inside. Set the boundary condition parameters of the gypsum material three-dimensional model, simulate the actual stress condition of the gypsum material three-dimensional model under the ideal state, so as to analyze and obtain the stress distribution of the gypsum material three-dimensional model, and provide conditions for evaluating and optimizing the gypsum material three-dimensional model according to the stress distribution of the gypsum material three-dimensional model.

[0057] Here, the constraint conditions of the gypsum material three-dimensional model are also set, that is, it is assumed that there is no gap between the gypsum models; and the contact conditions between the model blocks adopt friction contact.

[0058] The clamping force applied to one side of the gypsum material three-dimensional model is Wherein F is the force applied by a person, L is the force arm, k is the torque coefficient, and d is the outer diameter of the threaded rod.

[0059] The production inclination angle is 9-17°, and preferably 13°.

[0060] When the internal mud pressure is applied, the mud pressure is controlled according to the height difference between the mud liquid level in the head tank and the fixed point in the inner cavity.

[0061] In the network processing in step one, the grid size is 10 mm, and the single unit spans an angle of 36° along the curvature.

[0062] In step two, the ultimate tensile stress is determined according to the three-point bending experiment.

[0063]

[0064] Wherein Fmax is the breaking load, L is the span, b is the width, and h is the thickness.

[0065] The allowable stress of the gypsum model under tensile stress is [σ] = σ lim / n.

[0066] Wherein n is the safety factor, and 1 < n < 2, and n is preferably 1.5.

[0067] Before establishing the three-dimensional model of the gypsum material in step one, the density, elastic modulus, and friction coefficient between the gypsum materials are collected, and the Poisson's ratio of the gypsum material for sanitary ceramics is set.

[0068] The embodiment also provides an application of the evaluation method of the utilization rate of the gypsum model material for sanitary ceramics in the structure optimization of the gypsum model.

[0069] By optimizing the structure of the region with a large volume but low utilization rate, the region with a large volume but low utilization rate is avoided as much as possible, thereby effectively improving the material utilization rate of the three-dimensional model of the gypsum material.

[0070] According to the volume and material utilization rate of each region of the three-dimensional model of the gypsum material, the structure of the region with a large volume but low utilization rate is optimized, and the optimized three-dimensional model of the gypsum material is obtained.

[0071] The material utilization rate of the optimized three-dimensional model of the gypsum material is calculated, and compared with the material utilization rate of the three-dimensional model of the gypsum material before optimization.

[0072] The following uses a group of embodiments to specifically describe the structure optimization process of the three-dimensional model of the gypsum material.

[0073] An evaluation method for gypsum model material utilization rate for sanitary ceramics, comprising the following steps:

[0074] Step S101, first confirm the water plaster ratio 1:1.5, prepare 3 or more size 330*30*30mm test bars, and collect the density, elastic modulus and friction coefficient between the gypsum materials, and set the Poisson ratio and other parameter data of the gypsum material for sanitary ceramics, prepare the gypsum test block, dry it, and measure the density of the gypsum test block:

[0075] ρ=1077Kg / m 3

[0076] As shown in Figure 1 , through three-point bending test, and collect displacement curve and load curve, through curve and formula, the value of the elastic modulus of the gypsum test block is:

[0077]

[0078] Through literature review, set the Poisson ratio of the gypsum for sanitary ceramics to 0.08, and measure the friction coefficient between the gypsum test blocks by the tilt method, which is 0.02.

[0079] Open Workbench to create Static Structural, open Engineering Data to set the gypsum material parameters.

[0080] Step S102, select a gypsum model as a reference object, establish a three-dimensional model of the gypsum material, import the three-dimensional model into Static Structural, and network the three-dimensional model of the gypsum material, as shown in Figure 2 and 3 , the network processing, the grid size is 10mm, and the single unit crosses the angle value along the curvature is 36°;

[0081] Step S103, as shown in Figure 4 , set the boundary condition parameters of the three-dimensional model of the gypsum material, analyze and obtain the stress distribution of the three-dimensional model of the gypsum material, import Results into Solution, as shown in Figure 5 and 6 , and according to the stress distribution of the finite element analysis in Results, divide the gypsum model into zones, and divide the stress range [0,[σ]] into m subintervals: Then divide the three-dimensional model of the gypsum material into m subareas according to the stress range of the interval, where [σ] is the allowable stress;

[0082] The boundary condition parameters include applying clamping force to one side of the gypsum material three-dimensional model, restraining the horizontal degree of freedom on the other side, restraining Z-axis displacement, restraining X-axis and Y-axis displacement, applying gravity, and applying mud pressure inside. The clamping force applied to one side of the gypsum material three-dimensional model is where F is the force applied by a person, L is the force arm, k is the torque coefficient, and d is the outer diameter of the threaded rod.

[0083] The gravity is applied according to the production inclination angle (9°-17°), and the production inclination angle is 13°.

[0084] When the mud pressure is applied inside, the height difference between the mud liquid level in the high tank and the fixed point in the inner cavity is used to control the pressure applied by the mud. Here, the mud density is calculated by collecting the production mud as follows: ρ = 1800 Kg / m 3 The height difference between the mud liquid level in the high tank and the fixed point in the inner cavity is 500 mm.

[0085] In order to ensure the accuracy of the three-dimensional model, the constraint conditions of the gypsum material three-dimensional model are set, that is, it is assumed that there is no gap between the gypsum models, and the contact conditions between the model blocks adopt friction contact.

[0086] As shown in Figure 1 , the ultimate tensile stress is determined according to the three-point bending experiment:

[0087]

[0088] where Fmax is the breaking load, L is the span, b is the width, and h is the thickness.

[0089] The allowable stress of the gypsum model under tensile stress is [σ] = σ lim / n.

[0090] where n is the safety factor, and n is 1.5.

[0091] Step S104, the volume of each region is derived respectively, the volume of each stress region is obtained, and the volume ratio of the m sub-regions to the total volume is V1, V2, V3, …, V m , the percentage of the kth sub-region in the total volume is V k , the upper limit of the stress of the kth sub-region is [σ k ], and the material utilization rate of the kth sub-region is:

[0092]

[0093] Step S105, as shown in Figure 7 and 8 , the material utilization rate of the entire gypsum material three-dimensional model is:

[0094]

[0095] Table 1 summarizes the material utilization rates of the 3D models of gypsum materials before and after optimization.

[0096] Step S106: By optimizing the structure of areas that occupy a large volume but have low utilization, the occurrence of areas that occupy a large volume but have low utilization is avoided as much as possible, thereby effectively improving the material utilization rate of the 3D model of gypsum material.

[0097] Based on the volume occupied by stress distribution in each region of the 3D model of gypsum material and the material utilization rate in each region, structural optimization is performed on regions with large volume but low utilization rate to obtain the optimized 3D model of gypsum material.

[0098] Calculate the material utilization rate of the optimized 3D model of gypsum material and compare it with the material utilization rate of the unoptimized 3D model of gypsum material. Figure 9 As shown, when the material utilization rate after optimization is greater than that before optimization, it indicates that the structural optimization is reasonable; otherwise, the structural optimization is unreasonable.

[0099] Table 1 Summary of material utilization rates in the 3D models of gypsum materials before and after optimization.

[0100]

[0101] As shown in Table 1 and Figure 8 As shown, regions 1 and 3 account for as much as 50.90% and 40.28% of the volume, but their utilization rates are only 5.09% and 12.08%. Regions 1 and 3 can be optimized. After optimization, the material utilization rate of the 3D model of gypsum material increased from 19.98% to 27.57%, which shows that the structural optimization is reasonable.

[0102] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A method for evaluating the gypsum model material utilization rate for sanitary ceramics, characterized by, It comprises the following steps: Step one, establishing a three-dimensional model of the gypsum material, and network processing the three-dimensional model of the gypsum material; Step two, set the boundary condition parameters of the gypsum material three-dimensional model, analyze the stress distribution of the gypsum material three-dimensional model, and divide the gypsum model according to the stress distribution of the finite element analysis, and divide the stress range into m subintervals: … Then divide the gypsum material three-dimensional model into m subareas according to the stress range of the interval, wherein is the allowable stress; Step three, the ratio of the volume of m sub-regions to the total volume is respectively , … , the percentage of the kth sub-region in the total volume is , the upper limit of the stress of the kth sub-region is , and the material utilization rate of the kth sub-region is ， Step four, the material utilization rate of the entire gypsum material three-dimensional model is: ； The boundary condition parameters include applying clamping force to one side of the gypsum material three-dimensional model, constraining the horizontal degree of freedom on the other side, constraining Z-axis displacement, constraining X-axis and Y-axis displacement, applying gravity, and internally applying mud pressure. A clamping force of where F is the force applied, L is the force arm, k is the torque coefficient, and d is the outer diameter of the threaded rod. In step two, the ultimate tensile stress is determined according to the three-point bending experiment: ， Where Fmax is the breaking load, L is the span, b is the width, and h is the thickness. The area of the gypsum model under tensile stress, whose allowable stress is ; Where n is the safety factor, and 1 < n < 2.

2. The method for evaluating the gypsum model material utilization ratio for sanitary ceramics according to claim 1, characterized in that, The gravity is applied according to the production inclination angle, and the production inclination angle is 9°-17°.

3. The method for evaluating the gypsum model material utilization ratio for sanitary ceramics according to claim 1, characterized in that, When the mud pressure is internally applied, the pressure applied by the mud is controlled according to the height difference between the mud liquid level in the high tank and the fixed point in the inner cavity.

4. The method for evaluating the gypsum model material utilization ratio for sanitary ceramics according to claim 1, characterized in that, In step one, the network processing is performed with a grid size of 10 mm, and the single unit crosses the angle value of 36° along the curvature.

5. The method for evaluating the gypsum model material utilization ratio for sanitary ceramics according to claim 1, characterized in that, Before establishing the three-dimensional model of the gypsum material in step one, the density, elastic modulus, and friction coefficient between the gypsum materials are collected, and the Poisson's ratio of the gypsum material for sanitary ceramics is set.

6. The application of the evaluation method of the gypsum model material utilization rate for sanitary ceramics according to any one of claims 1-5 in the structure optimization of the gypsum model.

7. The application of the evaluation method of the gypsum model material utilization rate for sanitary ceramics according to claim 6 in the structure optimization of the gypsum model, characterized in that, According to the volume occupied by the stress distribution of each region of the gypsum material three-dimensional model and the material utilization rate of each region, the structure of the region with high volume and low utilization rate is optimized to obtain an optimized gypsum material three-dimensional model; The material utilization rate of the optimized gypsum material three-dimensional model is calculated and compared with the material utilization rate of the gypsum material three-dimensional model before optimization. When the material utilization rate after optimization is greater than that before optimization, it indicates that the structure optimization is reasonable, otherwise the structure optimization is unreasonable.

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