Method for controlling deformation in processing of thin-walled members

Abstract

This invention relates to a method for controlling deformation during the processing of thin-walled components, comprising the following steps: machining a blank using a cutting tool to form a core shell, the core shell having a main shell and a secondary shell, the outer diameter of the main shell being larger than that of the secondary shell; the main shell also having a main end hole, and the secondary shell also having a secondary end hole, with a process block inside the secondary end hole; wrapping a protective strip around the surface of the main shell, forming a core shell assembly with the core shell and the protective strip; removing a portion of the material from the main shell and the protective strip using a cutting tool to form a feature hole on the surface of the core shell assembly; then removing the process block using another cutting tool; and finally separating the core shell assembly, the positioning plate, and the machine tool spindle to complete the processing. By changing the process sequence, the residual thermal stress inside the core shell is significantly released before wrapping the protective strip and then machining to form the feature hole, reducing the difference in shrinkage deformation between the protective strip and the core shell, thus improving processing accuracy and the appearance quality of the core shell assembly.

Description

Technical Field

[0001] This invention belongs to the field of cutting process technology, and particularly relates to a method for controlling deformation during the processing of thin-walled components. Background Technology

[0002] In mechanical equipment, in order to improve the performance or specific physical properties of parts, other auxiliary materials are often wrapped around the surface of the parts. For example, when a high-silica heat insulation strip is wrapped around the surface of an aluminum alloy substrate, the ablation resistance and thermal shock resistance of the parts can be significantly improved. However, when the surface of the parts is wrapped with corresponding auxiliary strips, the difficulty of machining the parts often increases and the machining accuracy often decreases.

[0003] In the prior art, patent document with publication number "CN102658467B" discloses a turning method for winding a heat-insulating layer around a metal shell section and a winding mandrel. This patented technical solution effectively improves the problems of delamination, cracking, slag shedding, blockage, and breakage that easily occur when turning heat-insulating layers in existing machining processes by controlling the parameters of the turning method, thus increasing the finished product qualification rate. By changing the clamping method, it reduces clamping deformation of the parts during machining and lowers the difficulty of alignment. Furthermore, by improving the manufacturing method of the heat-insulating layer, it allows the heat-insulating layer to be directly wound onto the metal shell section, simplifying the manufacturing and assembly processes of the heat-insulating layer, reducing labor intensity, and making the connection between the heat-insulating layer and the metal shell section tighter.

[0004] In existing technologies, the protective strip is often wrapped around the surface of the workpiece substrate after all the cutting and machining processes are completed. However, since the thermal conductivity and thermal expansion coefficient of the workpiece substrate and the protective strip are often different, residual heat often remains inside the workpiece after it has been cut and shaped. If the auxiliary material is wrapped around the surface of the workpiece immediately, the workpiece substrate will continue to cool and shrink. Due to the difference in thermal conductivity and shrinkage degree between the workpiece substrate and the protective strip, wrinkles will form on the surface of the workpiece, affecting the appearance quality of the parts. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a method for controlling deformation during the processing of thin-walled components.

[0006] This invention provides a method for controlling deformation during the processing of thin-walled components, comprising the following steps:

[0007] Step 1: Provide a cutting tool and a blank. Use the cutting tool to cut and process the blank to form a core shell. The core shell has a main shell and a secondary shell. The outer diameter of the main shell is larger than the outer diameter of the secondary shell. The main shell is also provided with a main end hole, and the secondary shell is also provided with a secondary end hole. A process block is also provided in the secondary end hole.

[0008] Step 2: Provide a protective strip and wrap the protective strip around the surface of the main housing, so that the core shell and the protective strip form a core shell assembly;

[0009] Step 3: Use the cutting tool to remove part of the material of the main housing and protective strip, form feature holes on the surface of the core housing assembly, and then use the cutting tool to remove the process block;

[0010] Step 4: After separating the core shell assembly, the positioning plate, and the machine tool spindle, the machining is completed.

[0011] The method for controlling deformation during the processing of thin-walled components further includes the following steps: providing a machine tool and a positioning plate, the positioning plate being fixedly connected to a support platform; first connecting the cutting tool to the machine tool; then fitting the support platform into the main end hole or the secondary end hole; then clamping the positioning plate together with the spindle of the machine tool; and then performing step one or step three.

[0012] The method for controlling deformation during the processing of thin-walled components also includes the following steps:

[0013] Step 1: When performing Step 1, rough machining allowance and fine machining allowance are reserved on the surfaces of the main housing, the sub-housing, the main end hole and the sub-end hole;

[0014] Step 2: Perform rough machining on the core shell, using the cutting tool to remove the rough machining allowance reserved on the surfaces of the main shell, sub-shell, main end hole and sub-end hole;

[0015] Step 3: Perform aging treatment on the core shell;

[0016] Step 4: Perform finishing on the core shell. After removing the pre-reserved finishing allowance on the surfaces of the main shell, sub-shell, main end hole, and sub-end hole using the cutting tool, proceed to Step 2.

[0017] The method for controlling deformation during the processing of thin-walled components also includes the following steps:

[0018] In step 1, the core shell also has a transition shell, which is connected between the main shell and the secondary shell. The outer diameter of the transition shell is smaller than that of the main shell and larger than that of the secondary shell. The surface of the transition shell also has the roughing allowance and finishing allowance reserved. In step 2, the core shell is rough-machined, and the tool is used to remove the roughing allowance reserved on the surface of the transition shell. In step 4, the core shell is finish-machined, and the tool is used to remove the finishing allowance reserved on the surface of the transition shell.

[0019] The method for controlling deformation during the processing of thin-walled components also includes the following steps:

[0020] In step 1, a transition hole is provided inside the main housing, which connects the main end hole and the secondary end hole. The surface of the transition hole is reserved with roughing allowance and finishing allowance. In step 2, the core shell is rough machined, and the tool is used to remove the roughing allowance reserved on the surface of the transition hole. In step 4, the core shell is finish machined, and the tool is used to remove the finishing allowance reserved on the surface of the transition hole.

[0021] In step 4, the core shell is precision machined. The feed rate of the tool is 0.05-0.1 mm / r, and the single cutting depth of the tool is 0.1-0.3 mm.

[0022] The machine tool is a CNC lathe.

[0023] The cutting tool is a turning tool with a diamond coating on its surface.

[0024] In step 3, the aging process includes switching the core shell between a low-temperature insulation stage and a high-temperature insulation stage at least three times.

[0025] The protective belt is made of high-silica insulating material.

[0026] The beneficial effects of this invention are as follows: By adopting the technical solution provided by this invention, the sequence of local processing steps is changed. Specifically, after most of the shape features of the workpiece base core shell are processed and shaped, a protective strip is wound around it. Then, corresponding feature holes are machined on the surface of the workpiece with the protective strip wound around it. This allows the protective strip to cool simultaneously with the core shell, reducing the difference in shrinkage deformation between the protective strip and the core shell, thereby avoiding wrinkles in the protective strip. This improves both the machining accuracy and the overall appearance quality of the core shell assembly. In addition, during the machining process of the workpiece base core shell, the aging treatment process is set between the roughing and finishing processes. This significantly reduces the residual heat and residual thermal stress inside the core shell after it is shaped. During the machining of feature holes, the workpiece deformation shrinkage rate is reduced, further ensuring the machining accuracy. Attached Figure Description

[0027] Figure 1 This is a front view of the core shell of the present invention;

[0028] Figure 2 This is a schematic diagram showing the connection between the support platform and the main end hole of the present invention;

[0029] Figure 3 This is a schematic diagram showing the connection between the support platform and the secondary end hole of the present invention;

[0030] Figure 4 This is a front view of the core shell assembly of the present invention.

[0031] In the figure: 1-core shell, 2-main shell, 3-sub-shell, 4-main end hole, 5-sub-end hole, 6-process block, 7-feature hole, 8-transition shell, 9-transition hole, 10-protective strip, 11-positioning plate, 12-support platform. Detailed Implementation

[0032] The technical solution of the present invention will be further described below with reference to the accompanying drawings, but the scope of protection claimed is not limited thereto;

[0033] This invention provides a method for controlling deformation during the processing of thin-walled components, such as... Figures 1 to 4 As shown, it includes the following steps:

[0034] Step 1: Provide cutting tools and blanks. Use the cutting tools to cut and process the blanks to make core shell 1. Core shell 1 has a main shell 2 and a secondary shell 3. The outer diameter of the main shell 2 is larger than the outer diameter of the secondary shell 3. The main shell 2 is also provided with a main end hole 4, and the secondary shell 3 is also provided with a secondary end hole 5. The secondary end hole 5 is also provided with a process block 6.

[0035] Step 2: Provide a protective strip 10 and wrap the protective strip 10 around the surface of the main housing 2, so that the core housing 1 and the protective strip 10 form a core housing assembly;

[0036] Step 3: Use a cutting tool to remove part of the material of the main housing 2 and the protective strip 10, form feature holes 7 on the surface of the core housing assembly, and then use a cutting tool to remove the process block 6.

[0037] Step 4: After separating the core shell assembly, positioning plate 11, and machine tool spindle, the machining is completed.

[0038] By adopting the technical solution provided by this invention, the sequence of local processing steps is changed. Specifically, after most of the shape features of the workpiece base core shell are processed and shaped, a protective strip is wound around it. Then, corresponding feature holes are machined on the surface of the workpiece with the protective strip wound around it. This allows the protective strip to cool simultaneously with the core shell, reducing the difference in shrinkage deformation between the protective strip and the core shell, thereby avoiding wrinkles in the protective strip. This improves both the machining accuracy and the overall appearance quality of the core shell assembly. In addition, during the machining process of the workpiece base core shell, the aging treatment process is set between the roughing and finishing processes. This significantly reduces the residual heat and residual thermal stress inside the core shell after it is shaped. During the machining of feature holes, the deformation shrinkage rate of the workpiece is reduced, further ensuring the machining accuracy.

[0039] Specifically, the feature hole 7 is a rectangular through hole, and there are multiple process blocks 6. These process blocks 6 are arranged in a circumferential array along the inner wall of the secondary end hole 5. The projection of the outer surface of the main shell 2 onto the axial section of the core shell 1 is an arc. By adopting the technical solution of this invention and setting the process blocks 6, the rigidity of the core shell is increased, the deformation error of the core shell during the cutting process is reduced, and the cutting accuracy is further improved.

[0040] In addition, the method for controlling deformation during the processing of thin-walled components also includes the following steps: providing a machine tool and a positioning plate 11, the positioning plate 11 being fixedly connected to a support table 12; first connecting the cutting tool to the machine tool; then fitting the support table 12 into the main end hole 4 or the secondary end hole 5; then clamping the positioning plate 11 together with the spindle of the machine tool; and then performing step one or step three. By adopting the technical solution of this invention, during the cutting process of the core shell, the workpiece is also supported by the positioning plate 11 and the support table 12, further improving the rigidity of the workpiece, reducing the deformation error of the core shell during the cutting process, and further improving the cutting accuracy.

[0041] In addition, the method for controlling the deformation during the processing of thin-walled components also includes the following steps:

[0042] Step 1: When performing Step 1, rough machining allowance and fine machining allowance are reserved on the surfaces of the main housing 2, the secondary housing 3, the main end hole 4 and the secondary end hole 5;

[0043] Step 2: Roughly machine the core shell 1, using a cutting tool to remove the rough machining allowance reserved on the surfaces of the main shell 2, the secondary shell 3, the main end hole 4, and the secondary end hole 5;

[0044] Step 3: Perform aging treatment on core shell 1;

[0045] Step 4: Perform finishing on the core shell 1. After removing the pre-reserved finishing allowance on the surfaces of the main shell 2, the secondary shell 3, the main end hole 4, and the secondary end hole 5 using a cutting tool, proceed to step two.

[0046] By adopting the technical solution of the present invention, the aging treatment process of the core shell is set between the roughing process and the finishing process. While ensuring the cutting accuracy, the residual thermal stress after the workpiece is cut and formed is greatly reduced. This lays the foundation for the subsequent cutting of feature holes and reduces the deformation of the workpiece, which is conducive to further improving the cutting accuracy.

[0047] Specifically, the method for controlling deformation during the processing of thin-walled components also includes the following steps:

[0048] In step 1, the core shell 1 also has a transition shell 8, which is connected between the main shell 2 and the secondary shell 3. The outer diameter of the transition shell 8 is smaller than that of the main shell 2 and larger than that of the secondary shell 3. The surface of the transition shell 8 also has a roughing allowance and a finishing allowance. In step 2, the core shell 1 is rough machined, and the roughing allowance reserved on the surface of the transition shell 8 is removed using a cutting tool. In step 4, the core shell 1 is finish machined, and the finishing allowance reserved on the surface of the transition shell 8 is removed using a cutting tool.

[0049] Furthermore, the method for controlling deformation during the processing of thin-walled components also includes the following steps:

[0050] In step 1, the main housing 2 is also provided with a transition hole 9, which connects the main end hole 4 and the secondary end hole 5. The surface of the transition hole 9 is reserved with roughing allowance and finishing allowance. In step 2, the core housing 1 is roughed, and the roughing allowance reserved on the surface of the transition hole 9 is removed by a cutting tool. In step 4, the core housing 1 is finished, and the finishing allowance reserved on the surface of the transition hole 9 is removed by a cutting tool.

[0051] In addition, during step 4, the core shell 1 is finished, with a tool feed rate of 0.05-0.1 mm / r and a single cutting depth of 0.1-0.3 mm. The machine tool is a CNC lathe. The cutting tool is a turning tool with a diamond coating on its surface. In step 3, the aging treatment includes switching the core shell 1 between a low-temperature holding stage and a high-temperature holding stage at least three times. Preferably, the protective strip 10 is made of a high-silica insulating tape. The core shell 1 is made of aluminum alloy with grade 2A12.

Claims

1. A method for controlling deformation during the processing of thin-walled components, characterized in that: Includes the following steps: Step 1: Provide a cutting tool and a blank, and use the cutting tool to cut the blank to make a core shell (1), so that the core shell (1) has a main shell (2) and a secondary shell (3), and the outer diameter of the main shell (2) is larger than the outer diameter of the secondary shell (3). The main shell (2) is also provided with a main end hole (4), the secondary shell (3) is also provided with a secondary end hole (5), and the secondary end hole (5) is also provided with a process block (6). Step 2: Provide a protective strip (10) and wrap the protective strip (10) around the surface of the main housing (2) so that the core housing (1) and the protective strip (10) form a core housing assembly; Step 3: Use the cutting tool to remove part of the material of the main housing (2) and the protective strip (10), form a feature hole (7) on the surface of the core housing assembly, and then use the cutting tool to remove the process block (6). Step 4: After separating the core shell assembly, positioning plate (11) from the machine tool spindle, the machining is completed; The method for controlling the deformation of thin-walled components further includes the following steps: providing a machine tool and a positioning plate (11), the positioning plate (11) is also fixedly connected to the support (12), first connecting the cutting tool to the machine tool, then fitting the support (12) into the main end hole (4) or the secondary end hole (5), then clamping the positioning plate (11) together with the spindle of the machine tool, and then performing step one or step three; The method for controlling deformation during the processing of thin-walled components also includes the following steps: Step 1: When performing Step 1, the surfaces of the main housing (2), the secondary housing (3), the main end hole (4) and the secondary end hole (5) are all reserved with rough machining allowance and fine machining allowance; Step 2: Roughly machine the core shell (1) by using the cutting tool to remove the rough machining allowance reserved on the surface of the main shell (2), the secondary shell (3), the main end hole (4) and the secondary end hole (5); Step 3: Perform aging treatment on the core shell (1); Step 4: Perform finishing on the core shell (1). After removing the finishing allowance reserved on the surface of the main shell (2), the secondary shell (3), the main end hole (4) and the secondary end hole (5) using the cutting tool, proceed to step two. During step 1, the core shell (1) also has a transition shell (8), which is connected between the main shell (2) and the secondary shell (3). The outer diameter of the transition shell (8) is smaller than that of the main shell (2), and the outer diameter of the transition shell (8) is larger than that of the secondary shell (3). The surface of the transition shell (8) also has the roughing allowance and the finishing allowance reserved. When performing step 1, the main housing (2) is also provided with a transition hole (9), which is connected between the main end hole (4) and the secondary end hole (5). The surface of the transition hole (9) is also reserved with the rough machining allowance and the fine machining allowance.

2. The method for controlling deformation during the processing of thin-walled components as described in claim 1, characterized in that: The method for controlling deformation during the processing of thin-walled components also includes the following steps: In step 2, the core shell (1) is rough machined, and the rough machining allowance reserved on the surface of the transition shell (8) is removed using the cutting tool; in step 4, the core shell (1) is fine machined, and the fine machining allowance reserved on the surface of the transition shell (8) is removed using the cutting tool.

3. The method for controlling deformation during the processing of thin-walled components as described in claim 1, characterized in that: The method for controlling deformation during the processing of thin-walled components also includes the following steps: In step 2, the core shell (1) is rough machined, and the rough machining allowance reserved on the surface of the transition hole (9) is removed by the cutting tool; in step 4, the core shell (1) is fine machined, and the fine machining allowance reserved on the surface of the transition hole (9) is removed by the cutting tool.

4. The method for controlling deformation during the processing of thin-walled components as described in claim 1, characterized in that: In step 4, the core shell (1) is precision machined. The feed rate of the tool is 0.05-0.1 mm / r, and the single cutting depth of the tool is 0.1-0.3 mm.

5. The method for controlling deformation during the processing of thin-walled components as described in claim 1, characterized in that: The machine tool is a CNC lathe.

6. A method for controlling deformation during the processing of thin-walled components as described in any one of claims 1 to 4, characterized in that: The cutting tool is a turning tool with a diamond coating on its surface.

7. The method for controlling deformation during the processing of thin-walled components as described in claim 1, characterized in that: In step 3, the aging process includes switching the core shell (1) between the low temperature insulation stage and the high temperature insulation stage at least three times.

8. The method for controlling deformation during the processing of thin-walled components as described in claim 1, characterized in that: The protective strip (10) is made of high silica-oxygen insulating material.

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