Selection method for non-uniformly distributed clamping positions of split casing

Abstract

The invention belongs to the field of aviation casing machining, and particularly relates to a method for selecting non-uniform distribution clamping positions of a split casing, which comprises the following steps of: firstly, establishing a finite element simulation model, then preliminarily determining the non-uniform distribution clamping positions of parts, specifically, respectively arranging two clamping positions on split casing parts on two sides of a horizontal mounting edge of the casing part, other clamping positions are uniformly distributed on the rest parts of the circumference of the cartridge receiver part; the method comprises the following steps of: selecting a clamping position, performing finite element simulation analysis, adjusting the clamping position according to a simulation result, iteratively optimizing the clamping position into an optimal state, and finally completing the manufacturing and test verification of a tool according to the optimized clamping position. The method can be applied to the selection of the clamping position when a part is a split casing, and because a horizontal mounting edge is a weak point of the part, the machining precision is greatly improved. By means of the method, the clamping reliability of the split casing can be guaranteed, part deformation can be controlled, and it is guaranteed that the free state of a product meets the design requirement.

Description

Technical Field

[0001] The invention belongs to the field of aviation casing processing, and in particular relates to a method for selecting non-uniformly distributed clamping positions of a split casing. Background Art

[0002] The split receiver is composed of two split receiver parts assembled by bolts. When the split receiver is cut, the tooling clamping positions are generally evenly distributed, resulting in the connection between the two split receiver parts, that is, the horizontal mounting edge positions of the two split receiver parts being the weak link in clamping. Vibration is generated during machining, and the machining process is unstable. When turning to the horizontal mounting edge position, irregular vibration is generated, and when milling to the mounting edge position, the tool deflection occurs, causing the deformation of the final product at the mounting edge position to exceed the design requirements. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention proposes a method for selecting non-uniformly distributed clamping positions of a split receiver. The method determines the non-uniformly distributed clamping positions of the split receiver through finite element simulation.

[0004] A method for selecting non-uniformly distributed clamping positions of a split receiver comprises the following steps:

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

[0006] According to the actual size of the casing parts and the position of the horizontal mounting edge, a 3D model of finite element simulation is established to ensure that the part size of the 3D model is consistent with the material and the real parts;

[0007] Step 2: Preliminary determination of the unevenly distributed clamping positions of the parts

[0008] According to the position of the horizontal mounting edge of the receiver part and the principle of strengthening the position strength of the horizontal mounting edge, two clamping positions are respectively provided on the split receiver parts on both sides of the horizontal mounting edge of the receiver part, and other clamping positions are evenly distributed on the rest of the circumference of the receiver part;

[0009] Step 3: Conduct finite element simulation analysis

[0010] According to the established 3D model and clamping position, the cutting stability and deformation of the casing parts under the processing state are simulated;

[0011] Step 4: Iteration of clamping position optimization

[0012] Adjust the clamping position according to the simulation results and iterate and optimize to the best state;

[0013] Step 5: Tooling manufacturing and test verification

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

[0015] In step 1, the three-dimensional model is respectively modeled for the upper and lower parts of the casing and assembled together, so as to accurately simulate the connection condition of the horizontal mounting edges of the parts.

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

[0017] In step 3, the cutting stability and the deformation of the parts are reflected in the deformation of the horizontal mounting edge and the roundness deformation of the casing parts.

[0018] In step 4, the best state of iterative optimization is that the roundness deformation of the receiver 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 receiver part remain unchanged, the clamping positions of other parts of the part are adjusted, and the simulation analysis of step 3 is performed again until the simulation result meets the deformation requirement.

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

[0020] Through finite element simulation, this method determines the eight unevenly distributed clamping positions of the split receiver, sets two clamping positions on both sides of the horizontal mounting edge, and evenly distributes the remaining four clamping positions on the rest of the circumference of the receiver parts. Through on-site production verification, the part processing efficiency and quality are improved, the part deformation is controlled, the deformation of the horizontal mounting edge is controlled within 0.1mm, and the product meets the requirements of the design drawings in the free state.

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

[0022] Figure 1 It is a structural schematic diagram of a casing part of a method for selecting non-uniformly distributed clamping positions of a split casing of the present invention;

[0023] Figure 2 The present invention is a structural schematic diagram of the clamping positions of a method for selecting non-uniformly distributed clamping positions of a split receiver. DETAILED DESCRIPTION

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

[0025] The part is an aircraft engine compressor casing, and the method of the invention is used in the clamping position of the fine turning and fine milling process. Specifically, Figure 1-2 As shown, a method for selecting non-uniformly distributed clamping positions of a split receiver includes the following steps:

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

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

[0028] Step 2: Preliminary determination of the unevenly distributed clamping positions of the parts

[0029] According to the position of the horizontal mounting edge of the receiver part and the principle of strengthening the strength of the horizontal mounting edge, two clamping positions are arranged on the split receiver parts on both sides of the horizontal mounting edge of the receiver part, 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 other clamping positions are evenly distributed on the rest of the circumference of the receiver part, specifically clamping position 3, clamping position 4, clamping position 7 and clamping position 8, wherein clamping position 3 and clamping position 4 are evenly distributed between clamping position 2 and clamping position 5, and clamping position 7 and clamping position 8 are evenly distributed between clamping position 1 and clamping position 6;

[0030] Step 3: Conduct finite element simulation analysis

[0031] According to the established 3D model and clamping position, the cutting stability and part deformation under the processing state are simulated, specifically the deformation of the horizontal mounting edge and the roundness deformation of the casing parts;

[0032] Step 4: Iteration of clamping position optimization

[0033] Adjust the clamping position according to the simulation results, and iterate and optimize to the best state. If the simulation result exceeds 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 receiver part remain unchanged, that is, the positions of clamping position 1, clamping position 2, clamping position 5 and clamping position 6 remain unchanged, and adjust the clamping positions of other parts of the part, that is, adjust the positions of clamping position 3, clamping position 4, clamping position 7 and clamping position 8, and perform the simulation analysis of step 3 again until the simulation result meets the deformation requirement;

[0034] Step 5: Tooling 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 parts meets the requirements of the design drawings.

[0036] Through finite element simulation, this method determines the eight unevenly distributed clamping positions of the split receiver, sets two clamping positions on both sides of the horizontal installation edge, and evenly distributes the remaining four clamping positions on the rest of the circumference of the receiver parts. It is verified through on-site production, which improves the processing efficiency and quality of parts, controls the deformation of parts, and ensures that the product meets the requirements of the design drawings in the free state.

[0037] The method of the present invention can be applied to the selection of the clamping position when processing a split receiver. Since the horizontal installation edge is the weak point of the part, it is strengthened during clamping to ensure processing stability. After applying this method, the reliability of the clamping of the split receiver can be guaranteed, the deformation of the parts can be controlled, and the free state of the product can be guaranteed to meet the design requirements.

Claims

1. A method for selecting unevenly distributed clamping positions of a split receiver, characterized in that: The following steps are involved: Step 1: Create a finite element simulation model According to the actual size of the casing parts and the position of the horizontal mounting edge, a 3D model of finite element simulation is established to ensure that the part size of the 3D model is consistent with the material and the real parts; Step 2: Preliminary determination of the unevenly distributed clamping positions of the receiver parts According to the position of the horizontal mounting edge of the receiver part and the principle of strengthening the position strength of the horizontal mounting edge, two clamping positions are respectively provided on the split receiver parts on both sides of the horizontal mounting edge of the receiver part, and other clamping positions are evenly distributed on the rest of the circumference of the receiver part; Step 3: Conduct finite element simulation analysis According to the established 3D model and clamping position, the cutting stability and deformation of the casing parts under the processing state are simulated; Step 4: Iteration of clamping position optimization Adjust the clamping position according to the simulation results and iterate and optimize to the best state; Step 5: Tooling manufacturing and test verification According to the optimized clamping position, the manufacturing and test verification of the tooling are completed.

2. A method for selecting unevenly distributed clamping positions of a split receiver according to claim 1, characterized in that: In step 1, the three-dimensional model is respectively modeled for the upper and lower parts of the casing and assembled together, so as to accurately simulate the connection condition of the horizontal mounting edges of the parts.

3. The method for selecting the non-uniformly distributed clamping positions of a split receiver according to claim 1, characterized in that: In step 2, the vertical distance between the two clamping positions respectively arranged on the split receiver parts on both sides of the horizontal mounting edge of the receiver part and the horizontal mounting edge is 13-15 mm.

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

5. The method for selecting the non-uniformly distributed clamping positions of a split receiver according to claim 1, characterized in that: In step 4, the optimal state of iterative optimization is that the roundness deformation of the receiver 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 receiver part remain unchanged, the clamping positions of other parts of the receiver part are adjusted, and the simulation analysis of step 3 is performed again until the simulation result meets the deformation requirement.

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