A method for selecting non-uniform clamping positions of a split mold

Abstract

The present application belongs to the field of aircraft cowl processing, and particularly relates to a method for selecting non-uniform clamping positions of split cowl, which comprises the following steps: firstly, establishing a finite element simulation model, then preliminarily determining the non-uniform clamping positions of the part, specifically, two clamping positions are respectively arranged on the split cowl part on both sides of the horizontal mounting edge of the cowl part, and the rest of the cowl part is uniformly arranged with other clamping positions; then, finite element simulation analysis is carried out, the clamping positions are adjusted according to the simulation results, and the best state is obtained through iteration optimization; finally, according to the optimized clamping positions, the manufacturing and test verification of the tooling are completed. The method can be applied to the selection of clamping positions when the part is a split cowl. Since the horizontal mounting edge is the weak point of the part, it is strengthened during clamping, thereby ensuring the processing stability. After the method is applied, the reliability of the split cowl clamping can be ensured, the part deformation can be controlled, and the free state of the product can meet the design requirements.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of aircraft casing processing, and particularly relates to a method for selecting non-uniform clamping positions of split casings. BACKGROUND

[0002] A split casing is assembled by two split casing parts using bolts. During cutting processing, the general tool clamping position is uniformly distributed, which leads to the weak link of the clamping position of the connecting part of the two split casing parts, i.e. the horizontal mounting edge position of the two split casing parts. Vibration is generated during processing, and the processing process is unstable. Irregular vibration is generated when turning to the horizontal mounting edge position, and the tool is allowed to pass when milling to the mounting edge position, which causes the deformation of the final product at the mounting edge position to exceed the design requirement. SUMMARY

[0003] In view of the deficiencies of the prior art, the present application provides a method for selecting non-uniform clamping positions of split casings. The method determines the non-uniform clamping positions of split casings through finite element simulation.

[0004] A method for selecting non-uniform clamping positions of split casings, comprising the following steps:

[0005] Step 1: Establishing a finite element simulation model

[0006] According to the actual size of the casing part and the horizontal mounting edge position, a three-dimensional model of finite element simulation is established to ensure that the part size, material and real part of the three-dimensional model are consistent;

[0007] Step 2: Preliminary determination of part non-uniform clamping position

[0008] According to the position of the horizontal mounting edge of the casing part, two clamping positions are respectively arranged on the split casing parts on both sides of the horizontal mounting edge of the casing part according to the principle of strengthening the strength of the horizontal mounting edge position, and the rest of the circumference of the casing part is uniformly distributed with other clamping positions;

[0009] Step 3: Finite element simulation analysis

[0010] According to the established three-dimensional model and clamping position, the stability of cutting and the deformation of the casing part under the simulated processing state are simulated;

[0011] Step 4: Iterative optimization of clamping position

[0012] According to the simulation results, the clamping position is adjusted, and the best state is iteratively optimized;

[0013] Step 5: Tool manufacturing and test verification

[0014] According to the optimized clamping position, the manufacturing and test verification of the tool are completed.

[0015] In the step 1, the three-dimensional model is modeled and assembled to the upper and lower part of the casing part, so as to accurately simulate the connection of the horizontal installation edge of the part.

[0016] In the step 2, the vertical distance between the two clamping positions respectively arranged on the split casing part on both sides of the horizontal installation edge of the casing part is 13-15mm.

[0017] In the step 3, the stability of cutting and the deformation of the part are embodied in the deformation amount of the horizontal installation edge and the roundness deformation amount of the casing part.

[0018] In the step 4, the optimal state of iterative optimization is that the roundness deformation amount of the casing part is controlled within 0.05mm, and the deformation amount of the horizontal installation edge is controlled within 0.01mm; if the simulation result exceeds the deformation amount control value, the clamping positions on both sides of the horizontal installation edge of the casing part are not moved, the clamping positions of other parts of the part are adjusted, and the simulation analysis of the step 3 is performed again until the simulation result meets the deformation amount requirement.

[0019] The beneficial effects of the present application are as follows:

[0020] The present method determines the non-uniform eight clamping position points of the split casing through finite element simulation, sets two clamping positions on both sides of the horizontal installation edge, sets the remaining four clamping positions uniformly on the remaining parts of the casing part, and verifies through on-site production, thereby improving the part processing efficiency and quality, controlling the part deformation, controlling the deformation amount of the horizontal installation edge within 0.1mm, and meeting the design drawing requirements in a free state.

[0021] The method of the present application can be applied to the selection of clamping positions when the part is a split casing. Since the horizontal installation edge is a weak point of the part, it is strengthened during clamping to ensure the processing stability. After applying the method, the reliability of the split casing clamping can be ensured, the part deformation can be controlled, and the product in a free state can meet the design requirements. BRIEF DESCRIPTION OF DRAWINGS

[0022] Fig. 1 FIG. 1 is a structural schematic diagram of a casing part of a split casing non-uniform clamping position selection method of the present application;

[0023] Fig. 2 FIG. 2 is a structural schematic diagram of a clamping position of a split casing non-uniform clamping position selection method of the present application. DETAILED DESCRIPTION

[0024] The present application will be described in detail below with reference to the drawings.

[0025] The part is an aero-engine compressor casing, and the method is used for the clamping position in the finish turning and finish milling process, and specifically, as shown in Figs. 1-2 A selection method for the non-uniform clamping position of a split casing, comprising the following steps:

[0026] Step 1: Establish a finite element simulation model

[0027] According to the actual size of the casing part and the position of the horizontal mounting edge, a three-dimensional finite element simulation model is established. When modeling, the upper and lower casing parts are modeled and assembled together to accurately simulate the connection of the horizontal mounting edge of the part; and the size, material and real part of the three-dimensional model are consistent;

[0028] Step 2: Preliminary determination of the non-uniform clamping position of the part

[0029] According to the position of the horizontal mounting edge of the casing part, two clamping positions are arranged on the split casing part on both sides of the horizontal mounting edge of the casing part according to the principle of strengthening the strength of the horizontal mounting edge position, specifically, clamping position 1, clamping position 2, clamping position 5 and clamping position 6, the vertical distance between the above four clamping positions and the horizontal mounting edge is 13-15mm, and the rest of the circumference of the casing part is uniformly arranged with other clamping positions, specifically, clamping position 3, clamping position 4, clamping position 7 and clamping position 8, wherein, clamping position 3 and clamping position 4 are uniformly arranged between clamping position 2 and clamping position 5, and clamping position 7 and clamping position 8 are uniformly arranged between clamping position 1 and clamping position 6;

[0030] Step 3: Finite element simulation analysis

[0031] According to the established three-dimensional model and the clamping position, the stability of cutting and the deformation of the part under the simulated processing state are simulated, specifically, the deformation of the horizontal mounting edge, the roundness deformation of the casing part;

[0032] Step 4: Iterative optimization of clamping position

[0033] According to the simulation results, the clamping position is adjusted to the best state, if the simulation results exceed the deformation control value, the roundness deformation of the part is controlled within 0.05mm, and the deformation of the horizontal mounting edge is controlled within 0.01mm, then the clamping positions on both sides of the horizontal mounting edge of the casing part are not moved, i.e. the clamping position 1, clamping position 2, clamping position 5 and clamping position 6 are not moved, the clamping positions of other parts of the part are adjusted, i.e. the positions of clamping position 3, clamping position 4, clamping position 7 and clamping position 8 are adjusted, and the simulation analysis of step 3 is performed again until the simulation results meet the deformation requirement;

[0034] Step 5: Tool manufacturing and test verification

[0035] According to the optimized clamping position, the manufacturing and test verification of the tooling are completed, and the free state of the part meets the design drawing requirements.

[0036] The method determines eight non-uniform clamping position points of the split casing through finite element simulation, sets two clamping positions on both sides of the horizontal mounting edge, uniformly arranges the remaining four clamping positions on the remaining parts of the circumference of the casing part, and improves the machining efficiency and quality of the part through on-site production verification, controls the deformation of the part, and the free state of the product meets the design drawing requirements.

[0037] The method can be applied to the selection of clamping positions when the part is a split casing. Since the horizontal mounting edge is a weak point of the part, it is strengthened during clamping to ensure machining stability. After applying the method, the reliability of the split casing clamping can be ensured, the deformation of the part can be controlled, and the free state of the product can meet the design requirements.

Claims

1. A method for selecting non-uniform clamping positions of a split tool holder, characterized in that, The method comprises the following steps: Step 1: Establishing a finite element simulation model According to the actual size of the casing part and the position of the horizontal mounting edge, a three-dimensional model of the finite element simulation is established to ensure that the part size, material and three-dimensional model of the real part are consistent; The three-dimensional model is modeled and assembled together for the upper and lower casing parts, thereby accurately simulating the connection of the horizontal mounting edge of the part; Step 2: Preliminary determination of the non-uniform clamping position of the casing part According to the position of the horizontal mounting edge of the casing part, two clamping positions are respectively arranged on the split casing parts on both sides of the horizontal mounting edge of the casing part according to the principle of strengthening the strength of the horizontal mounting edge position, and the other clamping positions are uniformly arranged on the rest of the circumference of the casing part; Step 3: Finite element simulation analysis According to the established three-dimensional model and clamping position, the stability of cutting and the deformation of the casing part under the simulated machining state are simulated; Step 4: Iterative optimization of clamping position According to the simulation results, adjust the clamping position and iterate to optimize to the best state; The best state of iterative optimization is that the roundness deformation of the casing part is controlled within 0.05mm, and the deformation of the horizontal mounting edge is controlled within 0.01mm; If the simulation result exceeds the deformation control value, the clamping positions on both sides of the horizontal mounting edge of the casing part are not moved, the clamping positions of other parts of the casing part are adjusted, and the simulation analysis of step 3 is performed again until the simulation result meets the deformation requirement; Step 5: Manufacturing of tooling and test verification According to the optimized clamping position, the manufacturing and test verification of the tooling are completed.

2. The method of claim 1, wherein the non-uniform clamping position of the split housing is selected by, In step 2, the vertical distance between the two clamping positions respectively arranged on the split casing parts on both sides of the horizontal mounting edge of the casing part and the horizontal mounting edge is 13-15mm.

3. The method for selecting the non-uniformly distributed clamping position of the split-type receiver according to claim 1, characterized in that, In step 3, the stability of cutting and the deformation of the part are reflected in the deformation of the horizontal mounting edge and the roundness deformation of the casing part.

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