Numerical simulation model construction method of diamond reinforced WC alloy cutting pick

Abstract

The invention relates to the technical field of diamond-reinforced WC alloy cutting picks, in particular to a numerical simulation model construction method for diamond-reinforced WC alloy cutting picks, which comprises the following steps: step 1, model construction pretreatment: a, determining an application scene and a working environment condition of the diamond-reinforced WC alloy cutting picks; b, constructing a material parameter library of the diamond and the WC alloy; c, using CAD software to establish a geometric model according to the actual size and shape of the cutting pick; 2, constructing a numerical simulation model; according to the numerical simulation model construction method of the diamond-reinforced WC alloy cutting pick, the stress distribution, the deformation condition, the failure mode and the like of the cutting pick under the specific working condition are analyzed by constructing the numerical simulation model of the diamond-reinforced WC alloy cutting pick. And displaying the calculation result in the form of a graph or a chart through a visualization tool so as to carry out intuitive analysis. Meanwhile, the influences of different diamond contents, particle sizes, distribution modes and other factors on the performance of the cutting pick are compared, and the advantages and disadvantages of the cutting pick are evaluated.

Description

Technical Field

[0001] The invention relates to the technical field of diamond-reinforced WC alloy picks, in particular to a method for constructing a numerical simulation model of a diamond-reinforced WC alloy pick. Background Art

[0002] Diamond-reinforced WC alloy picks are high-performance picks made from a WC alloy matrix and diamond as a reinforcement, produced through hot-pressing and sintering. Compared to traditional alloy picks, these picks combine the high wear resistance of diamond with the high strength and hardness of WC alloy, significantly improving their service life and tunneling efficiency. These picks have broad application prospects in harsh working conditions such as coal mining, tunnel shielding, trenching, highway paving, and waterway dredging.

[0003] The values ​​of diamond-reinforced WC alloy picks are mostly obtained through experiments. Although the optimal diamond content, particle size and distribution can be evaluated through experiments, the period of obtaining the optimal diamond content, particle size and distribution data is relatively long.

[0004] In order to solve the above problems, we made improvements and proposed a method for constructing a numerical simulation model of diamond-reinforced WC alloy picks. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] The present invention provides a method for constructing a numerical simulation model of a diamond-reinforced WC alloy pick, comprising the following steps:

[0007] Step 1: Pre-processing of model building, including:

[0008] a. Determine the application scenarios and working environment conditions of diamond-reinforced WC alloy picks;

[0009] b. Construct a material parameter library for diamond and WC alloys;

[0010] c. Use CAD software to create a geometric model based on the actual size and shape of the pick;

[0011] Step 2: Construction of numerical simulation model;

[0012] a. Based on the material models of diamond and WC alloy defined in the finite element analysis (FEA) software, the geometric model is meshed using the finite element analysis (FEA) software;

[0013] b. Set reasonable boundary conditions and loading methods according to the actual working conditions of the pick;

[0014] c. Run numerical simulation software to solve and calculate the constructed model;

[0015] Step 3: Model building pre-processing and result analysis;

[0016] a. Use post-processing software to visualize the simulation results;

[0017] b. Evaluate the wear resistance, strength, and fracture toughness of the pick based on the simulation results, and analyze the effects of diamond content, distribution, size, and other factors on the pick performance.

[0018] The application scenarios of the diamond-reinforced WC alloy pick include coal mining and tunnel excavation, and the working environment conditions of the diamond-reinforced WC alloy pick are the mechanical environment, temperature environment and medium environment in the corresponding application scenarios.

[0019] As a preferred technical solution of the present invention, the material parameters of the diamond and WC alloy include density, elastic modulus, yield strength, Poisson's ratio, fracture toughness and hardness, and also include the distribution, size, content and interface bonding strength of diamond in the WC alloy.

[0020] As a preferred technical solution of the present invention, the material models of diamond and WC alloy include an elastic-plastic model, a fracture mechanics model and a damage model.

[0021] As a preferred technical solution of the present invention, the boundary conditions include the constraints of the contact relationship between the pick and the surrounding environment, and the loading method should include the effects of cutting force, impact force and external force.

[0022] As a preferred technical solution of the present invention, the pick in step 2b is subjected to multi-field coupling during operation, so a physical field model should be set up and coupling analysis should be performed in the numerical simulation.

[0023] As a preferred technical solution of the present invention, during the solution process in step 2c, the convergence and stability of the calculation process should be monitored to ensure the reliability of the solution result.

[0024] As a preferred technical solution of the present invention, the post-processing software includes stress cloud map, strain cloud map and displacement cloud map.

[0025] The beneficial effects of the present invention are:

[0026] 1. Method for constructing a numerical simulation model for this diamond-reinforced WC alloy pick. By constructing a numerical simulation model for this diamond-reinforced WC alloy pick, the stress distribution, deformation, and failure mode of the pick under specific operating conditions are analyzed. Visualization tools are used to display the calculation results in graphical or chart form for intuitive analysis. Furthermore, the effects of factors such as diamond content, particle size, and distribution on pick performance are compared and evaluated.

[0027] Second, the numerical simulation model construction method of this diamond-reinforced WC alloy pick can be used to optimize and improve the pick's geometric dimensions, material ratio, structural design and other data based on the numerical simulation results to improve its performance. During the optimization process, numerical simulation analysis needs to be repeated to verify the optimization effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0029] Figure 1 It is a structural schematic diagram of a method for constructing a numerical simulation model of a diamond-reinforced WC alloy pick according to the present invention;

[0030] Figure 2 It is a geometric modeling flow chart of the method for constructing a numerical simulation model of a diamond-reinforced WC alloy pick according to the present invention; DETAILED DESCRIPTION

[0031] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0032] Example: Figure 1 and Figure 2 As shown, the method for constructing a numerical simulation model of a diamond-reinforced WC alloy pick comprises the following steps:

[0033] Step 1: Pre-processing of model building, including:

[0034] a. Determine the application scenarios and working environment conditions of diamond-reinforced WC alloy picks;

[0035] b. Construct a material parameter library for diamond and WC alloys;

[0036] c. Use CAD software to create a geometric model based on the actual size and shape of the pick;

[0037] Considering the elasticity and brittleness of diamond, an elastic damage model is adopted, and for the WC matrix, an elastic-plastic damage coupling model is used to integrate the effects of plasticity and damage. A bilinear constitutive relation based on cohesive elements is used to study the properties of the interface.

[0038] A three-dimensional microscopic model of a diamond-composite WC alloy pick was established. The key to this step was to accurately simulate the microstructure of the composite pick, encompassing the WC matrix, diamond particles, and interface. To achieve this, Python was used for secondary development, employing a random adsorption algorithm to construct a three-dimensional randomly distributed microstructure. This method realistically simulated the size, content, and random distribution of diamond particles. Zero-thickness cohesive elements were inserted through Python programming to simulate the interface behavior between the diamond and matrix.

[0039] Considering the random distribution of diamond particles in the WC matrix, it may be necessary to simplify the model appropriately or use an equivalent material model to simulate its influence. When simplifying the model, key features such as particle distribution, shape, and size should be maintained as much as possible.

[0040] Step 2: Construction of numerical simulation model;

[0041] a. Based on the material models of diamond and WC alloy defined in the finite element analysis (FEA) software, the geometric model is meshed using the finite element analysis (FEA) software;

[0042] The size of the RVE model is 20 μm*20 μm*20 μm, the elastic modulus of diamond is 1220 GPa, and the density is 3.515 g / cm 3 , Poisson's ratio is 0.07. The elastic modulus of WC is 680GPa and the density is 15.63g / cm 3 , Poisson's ratio is 0.28. In the numerical simulation model, the particles and matrix are meshed using C3D4 elements, and the interface adopts zero-thickness cohesive element model with element type COH2D4.

[0043] The mesh should be refined at the interface between the diamond particles and the WC matrix, as well as in stress concentration areas, to improve computational accuracy. A three-dimensional microscopic model of a diamond-composite WC alloy pick was constructed using finite element software, including the WC matrix phase, the diamond reinforcement phase, and the interface. To account for the practical heterogeneity of particle size, a random distribution of equivalent diameters was adopted. Three material parameters were defined, respectively for the diamond, the interface, and the WC matrix.

[0044] b. Reasonable boundary conditions and loading methods were set based on the actual working conditions of the pick. To better reflect the actual situation and ensure model continuity, the quasi-static tensile process of the composite material was simulated using ABAQUS / Explicit Dynamics. Three symmetry constraints were applied, acting on the XOY, XOZ, and YOZ planes, respectively, thus restricting the degrees of freedom along the Z, Y, and X axes. Displacement was applied opposite the YOZ plane, along the X-axis.

[0045] c. Run numerical simulation software to solve and calculate the constructed model;

[0046] Step 3: Model construction post-processing and result analysis;

[0047] a. Use post-processing software to visualize the simulation results, and focus on the stress distribution and deformation at the interface between diamond and WC alloy in the visual simulation results;

[0048] b. Evaluate the wear resistance, strength, and fracture toughness of the pick based on the simulation results, and analyze the effects of diamond content, distribution, size, and other factors on the pick performance.

[0049] The application scenarios of diamond-reinforced WC alloy picks include coal mining and tunnel excavation. The working environment conditions of diamond-reinforced WC alloy picks are the mechanical environment, temperature environment and medium environment in the corresponding application scenarios.

[0050] The material parameters of diamond and WC alloy include density, elastic modulus, yield strength, Poisson's ratio, fracture toughness and hardness, and also include the distribution, size, content and interface bonding strength of diamond in WC alloy.

[0051] The material models of diamond and WC alloy include elastic-plastic model, fracture mechanics model and damage model.

[0052] The boundary conditions include the constraints on the contact relationship between the pick and the surrounding environment, and the loading method should include cutting force, impact force and external force.

[0053] The pick in step 2b is subjected to multi-field coupling during operation, such as the coupling of temperature field and stress field. In this case, a physical field model should be set up and coupling analysis should be performed in the numerical simulation.

[0054] During the solution process in step 2c, the convergence and stability of the calculation process should be monitored to ensure the reliability of the solution results.

[0055] The post-processing software includes stress cloud map, strain cloud map and displacement cloud map.

[0056] This paper constructs a numerical simulation model for diamond-reinforced WC alloy picks to analyze stress distribution, deformation, and failure modes under specific operating conditions. Visualization tools display the results in graphical or chart form for intuitive analysis. Furthermore, the effects of different diamond content, particle size, and distribution patterns on pick performance are compared and evaluated.

[0057] After using the numerical simulation model for diamond-reinforced WC alloy picks, the pick's geometry, material ratios, structural design, and other parameters can be optimized based on the simulation results to improve performance. Repeated numerical simulation analysis may be necessary to verify the results. The accuracy and reliability of the simulation results can be verified by preparing physical samples of diamond-reinforced WC alloy picks and conducting performance tests under actual operating conditions. Experimental validation ensures the validity of the numerical simulation model.

[0058] In the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limiting the present invention.

[0059] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0060] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A method for constructing a numerical simulation model of a diamond-reinforced WC alloy pick, characterized in that: The following steps are involved: Step 1: Model building pre-processing, including: a. Determine the application scenarios and working environment conditions of diamond-enhanced WC alloy picks; b. Construct material parameter library of diamond and WC alloy; c. Use CAD software to build a geometric model based on the actual size and shape of the pick; Step 2: Construction of numerical simulation model; a. Based on the material models of diamond and WC alloy defined in the finite element analysis (FEA) software, the geometric model is meshed using the finite element analysis (FEA) software; b. Set reasonable boundary conditions and loading methods according to the actual working conditions of the pick; c. Run numerical simulation software to solve and calculate the constructed model; Step 3: Model construction, post-processing and result analysis; a. Use post-processing software to visualize the simulation results; b. Evaluate the wear resistance, strength, and fracture toughness of the pick according to the simulation results, and analyze the effects of diamond content, distribution, size, and other factors on the performance of the pick.

2. The method for constructing a numerical simulation model of a diamond-enhanced WC alloy pick according to claim 1, characterized in that: The application scenarios of the diamond-reinforced WC alloy pick include coal mining and tunnel excavation, and the working environment conditions of the diamond-reinforced WC alloy pick are the mechanical environment, temperature environment and medium environment in the corresponding application scenarios.

3. The method for constructing a numerical simulation model of a diamond-enhanced WC alloy pick according to claim 1, characterized in that: The material parameters of the diamond and WC alloy include density, elastic modulus, yield strength, Poisson's ratio, fracture toughness and hardness, and also include the distribution, size, content and interface bonding strength of diamond in the WC alloy.

4. The method for constructing a numerical simulation model of a diamond-enhanced WC alloy pick according to claim 1, characterized in that: The material models of diamond and WC alloy include an elastic-plastic model, a fracture mechanics model and a damage model.

5. The method for constructing a numerical simulation model of a diamond-enhanced WC alloy pick according to claim 1, characterized in that: The boundary conditions include the constraints of the contact relationship between the pick and the surrounding environment, and the loading method should include the effects of cutting force, impact force and external force.

6. The method for constructing a numerical simulation model of a diamond-enhanced WC alloy pick according to claim 1, characterized in that: The pick in step 2b is subjected to multi-field coupling during operation, so a physical field model should be set up and coupling analysis should be performed in the numerical simulation.

7. The method for constructing a numerical simulation model of a diamond-enhanced WC alloy pick according to claim 1, characterized in that: During the solution process in step 2c, the convergence and stability of the calculation process should be monitored to ensure the reliability of the solution result.

8. The method for constructing a numerical simulation model of a diamond-enhanced WC alloy pick according to claim 1, characterized in that: The post-processing software includes stress cloud map, strain cloud map and displacement cloud map.

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