Take You To Know The Structural Optimization Experiment Of The Gusu Chocolate Cooling Tunnel!


In the casting molding process, after the correctly adjusted chocolate sauce enters a mold with a specific size and shape, it needs to be cooled and solidified by the cooling tunnel to form solid chocolate with good gloss, a particular condition, and a certain weight. Only if the cooling tunnel correctly regulates the cooling process’s temperature can the chocolate be demoulded smoothly.

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The cooling part of the cooling tunnel is divided into three stages according to the cooling temperature requirements: the first stage cooling temperature is about 10-15 dragons, the second stage cooling temperature is about 4~6 dragons, and the third stage recovery temperature is about 12~15 dragons. Therefore, the temperature zone setting of the cooling tunnel, the refrigeration compressor, and the fan is placed on the top of the terminal or terminal of the molding line.

The cold air blows backward along the template transport chain into the upper channel separated by the cooling tunnel and then enters the lower track for loop circulation. After completing the design of the chocolate cooling tunnel, the cooling tunnel needs to be analyzed by a computer to ensure that the operational performance of the chocolate cooling tunnel can be fully grasped before the cooling tunnel is manufactured and the design scheme of the cooling tunnel is verified, improved and improved.

The basic idea of finite element analysis is to discrete a continuous region into a limited group of units, which are connected in a certain way. When analyzing, it is similar to dividing an object into multiple small teams, analyzing each unit, and then combining the unit analysis results to obtain the overall analysis result.” Optimizing the design is to modify the design variables of the analyzed model so that the objective function value is minimal, provided that the constraints are met.

2.Finite Element Analysis Model Of The Existing Chocolate Cooling Tunnel In The Factory

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2.1 Build Finite Element Models

Use UGNX’s modeling module to build a 3D model of the chocolate cooling tunnel before finite element analysis. When performing a finite element analysis of the chocolate cooling tunnel as a whole, it is a nonlinear analysis due to the connection of individual parts. However, linear processing and surface contact can also ensure the connection deformation accuracy.

2.2 Model Idealization

Model idealization refers to the process of removing or suppressing features and creating additional features from a model before meshing. This helps weave, improve analysis accuracy, and speed finite element analysis. When idealizing a model, use the Idealize Geometry command to remove holes and fillets, the Remove Geometry Features command to remove other features, such as thread features, and the By Middle Face command to simplify the temporary hardware.

2.3 Grid Division Of Chocolate Cooling Tunnel

The optimization of the chocolate cooling tunnel needs to mesh before the calibration is achieved. Meshing is one of the pre-processing tasks for finite element analysis and the basis for finite element analysis calculations. For general models, [automatic unit size] can be used to determine the number of units; for critical parts or parts prone to stress concentration, the local mesh density can be modified through the [mesh control] command.

2.4 Set Material Properties

The UGNX Advanced Simulation Material Library provides standard materials corresponding to domestic material grades, which can be selected by consulting the relevant UG manual. In this analysis, the fabric of the driving shaft and the driven shaft are Steel-Rolled, the gear material is Steel, the “L” type guide is Aluminum_6061, the chocolate template is Nylon, the bearing material is AISI_STEEL_1005, and the rack plate is Ai-Si_310_SSO.

2.5 Apply Loads And Boundary Conditions

To apply constraints and loads to the finite element model according to the actual situation of the chocolate cooling tunnel factory, it is necessary to combine the stress of the chocolate cooling tunnel rack.Figure 3 load distribution of the rack.Once you have done the above, you can solve the finite element model.

3.Finite Element Analysis Post-Processing And Analysis Of Solution Results

The static analysis results of the shaft are as follows. The post material is steel-rolled, the yield strength is 235 MPa, and Young’s modulus of elasticity E=206000 MPa.

The law of displacement distribution of the axis, the maximum node displacement of the axis is 4.879mni, the position with the most considerable deformation is in the middle of the largest radius of curvature in the figure, and the deformation at both ends is small. The maximum nodal stress on the shaft of the chocolate cooling tunnel is 191.17MPa at the position supported by the bearing seat.

The shaft material is steel-rolled, and the yield strength of steel-rolled is 235 MPa. The maximum nodal stress of the shaft is very close to that of the post, so the chocolate cooling tunnel shaft design needs further improvement.

4.Optimized Design Of Important Parts After Improvement

The geometry optimization module in the UG simulation module performs geometric optimization of the driving shaft. This paper studies the active post, an important component of the chocolate cooling tunnel.

When you establish a geometric optimization analysis of the driving axis, specify the optimization type as AltairHyperOpt. The optimization goal of the driving shaft is to minimize the maximum nodal stress of the post;

the constraint is that the maximum displacement of the axis of the chocolate cooling tunnel does not exceed 3mm without changing the meshing requirements, boundary constraints, and load size of the shaft, the reference displacement at the calculation point, and the need to ensure the safety margin of the model stiffness of the chocolate cooling tunnel;

Design variable1 It is the diameter of the shaft, the original diameter is 40mm, and the optimization definition is 36mm-60mm. The design variables 2 and 3 are the installation position of the gear, and the distance of the original mounting gear surface according to the shaft end is 583mm,

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