A method for controlling deformation in processing of a wallboard part

Abstract

The application discloses a wallboard part machining deformation control method, which comprises the following steps: step S1: optionally taking one side of a blank as a part smooth surface, and performing surface finishing on the part smooth surface blank; step S2: rough machining of a part frame surface, leaving a margin T1 on a part rib side surface, and leaving a margin T2 on a part web surface; step S3: rough machining of a part smooth surface, leaving a margin T3 on a set pseudo-character rib side surface, and leaving a margin T4 on the part web surface; step S4: accurate machining of the part frame surface, removing the margin T1 on the part side surface and the margin T2 on the part web surface; and step S5: accurate machining of the part smooth surface, removing the part pseudo-character rib, the margin T3 on the side surface and the margin T4 on the part web surface. The method can ensure that the material removal amount of the part smooth surface and the part frame surface is basically the same during removal of a large margin, effectively suppresses warping deformation caused by uneven internal stress distribution after part machining, improves the machining quality of the part, and further enhances the rigidity of the web and the rib.

Description

Technical Field

[0001] This invention relates to the field of CNC machining technology, specifically to a method for controlling deformation during the machining of panel-type parts. Background Technology

[0002] Panel-type parts are widely used in the aerospace manufacturing field as typical structural components. Their structure is generally a flat, thin plate with a thickness of 1.2–3 mm. To achieve weight reduction, a lower limit is usually set on one side of the thin plate to form a cavity. To meet assembly requirements, some panel-type parts have ribs perpendicular to the web along the longitudinal direction around the cavity. The outline of the part is an open structure without flanges, and the ribs are independent and unconnected, ultimately giving the part a special structural form with one side being a frame surface and the other a smooth surface, such as… Figure 1 As shown. The structural form of this type of part results in a much larger amount of material removal from the frame surface during CNC machining than from the smooth surface. This leads to uneven distribution of internal stress between the frame and smooth surfaces. From a macroscopic perspective, this causes the part to warp along the direction perpendicular to the rib setting and from both sides towards the center after machining. Specifically, the sides of the part warp upwards, while the middle is concave, as shown. Figure 2 As shown. Traditional CNC machining methods still use a single-sided frame part machining method of rough milling the smooth surface → rough milling the frame surface → finish milling the smooth surface to the final position → finish milling the frame surface to the final position. This method does not take into account the special structural form of panel-type parts and cannot effectively suppress the warping deformation of the parts after machining. Since the parts only have independent ribs along the length, it is also impossible to remove the deformation by correction. As a result, the parts can only be assembled under stress, which seriously affects the assembly quality of the aircraft. Summary of the Invention

[0003] The purpose of this invention is to provide a method for controlling deformation during the processing of panel-type parts, which can effectively suppress warping deformation caused by uneven distribution of internal stress after part processing and improve the processing quality of the parts.

[0004] This invention is achieved through the following technical solution: a method for controlling deformation during the processing of panel-type parts, comprising the following steps:

[0005] Step S1: Select any one side of the blank as the polished surface of the part, and perform surface finishing on the polished blank surface;

[0006] Step S2: Roughly machine the frame surface of the part, leaving a margin T1 on the side of the ribs and a margin T2 on the web surface of the part;

[0007] Step S3: Roughly machine the smooth surface of the part, leaving a margin T3 on the side of the set pseudo-feature rib and a margin T4 on the web surface of the part;

[0008] Step S4: Finish the frame surface of the part to the required position, and remove the excess material T1 on the side of the part and the excess material T2 on the web surface of the part;

[0009] Step S5: Finish the part to the desired smooth surface, remove the false feature ribs, side allowance T3, and web allowance T4.

[0010] The working principle of this technical solution is as follows: pseudo-feature ribs are set on the smooth surface of the part to artificially construct a cavity structure similar to the frame surface of the part. During the rough machining of the smooth surface of the part, allowances are left on the sides of the pseudo-feature ribs and the smooth web plate. The remaining allowances are consistent with the rough machining allowances of the frame surface, ensuring that the amount of material removed from the smooth surface and the frame surface is basically the same during the removal of large allowances from the part blank. After the frame surface of the part is finished, the pseudo-feature ribs and their side allowances and web plate allowances on the smooth surface of the part are removed.

[0011] To better realize the present invention, in step S1, a stress-free method is used to finish the smooth surface of the part blank to ensure the accuracy of the smooth surface finish.

[0012] To better realize the present invention, in step S2, when rough machining the frame surface of the part, it is necessary to use a layer-first method to mill layer by layer to ensure that the residual stress in the blank is released stably and orderly.

[0013] To better realize the present invention, in step S2, when rough machining the frame surface of the part, it is necessary to ensure that T1 = T2.

[0014] To better realize the present invention, in step S3, the milling method used when roughing the smooth surface of the part should be consistent with that in step S2.

[0015] To better realize the present invention, in step S3, when rough machining the smooth surface of the part, it is necessary to ensure that T3 = T4.

[0016] To better realize the present invention, the thickness and height of the pseudo-feature ribs in step S3 should be consistent with the frame surface ribs.

[0017] To better implement the method of the present invention, the number, length and position of the pseudo-feature ribs in step S3 can be consistent with the frame ribs, or can be adjusted according to the actual deformation of the part.

[0018] To better implement the method of the present invention, in step S4, when finishing the frame surface of the part, the processing order should be to first remove the excess material T2 from the web surface of the part, and then remove the excess material T1 from the side surface of the part.

[0019] To better implement the method of the present invention, in step S5, when finishing the smooth surface of the part, the processing sequence should be as follows: first remove the side allowance T3 of the pseudo feature rib of the part, then remove the pseudo feature rib of the part, and finally remove the web surface allowance T4.

[0020] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0021] (1) The present invention artificially constructs a cavity structure similar to the frame surface of the part on the smooth surface of the part, which can ensure that the amount of material removed from the smooth surface and the frame surface of the part is basically the same during the removal of large allowances of the part blank. It can effectively suppress the warping deformation caused by uneven distribution of internal stress after the part is processed, and improve the processing quality of the part.

[0022] (2) In the present invention, when the frame surface of the part is precision milled, the pseudo feature ribs and machining allowance set during the rough machining of the smooth surface of the part can be used as a process support rib, which can further enhance the rigidity of the web and ribs, thereby increasing the deformation resistance of the web and ribs of the frame surface of the part during the precision machining process, and effectively improving the machining quality of the web and ribs of the frame surface of the part.

[0023] (3) The present invention can flexibly adjust the number, position and allowance of the ribs on the smooth surface of the part and the web plate according to the actual processing of the part, thereby adjusting the amount of material removed from the frame surface and the smooth surface of the part, and can fine-tune the deformation of the part after processing. Attached Figure Description

[0024] Other features, objects, and advantages of the invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0025] Figure 1 This is a schematic diagram of the overall structure of a panel-type part;

[0026] Figure 2 This is a schematic diagram of the side structure of a panel-type part;

[0027] Figure 3 This is a schematic diagram of the structure of Example 1;

[0028] Figure 4 This is a schematic diagram of the structure of Example 2;

[0029] Figure 5 This is a schematic diagram of the structure of Example 3;

[0030] Figure 6 This is a schematic diagram of the structure of Example 4;

[0031] Figure 7 for Figure 6 Sectional view along direction A in the middle;

[0032] Figure 8 This is a schematic diagram of the structure of Example 5;

[0033] Figure 9 These are schematic diagrams of the structures in Examples 6 and 8;

[0034] Figure 10 This is a schematic diagram of the structure of Example 7.

[0035] Wherein: 1—ribs on the frame of the part, 2—ribs on the smooth surface of the part, 3—web of the part, 4—ribs on the width of the part. Detailed Implementation

[0036] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0037] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0038] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0039] Example 1:

[0040] In this embodiment, a method for controlling deformation during the processing of panel-type parts mainly includes the following steps: Figure 3 As shown:

[0041] All parts not covered in this invention are the same as or can be implemented using existing technologies.

[0042] Step S1: Select any one side of the blank as the polished surface of the part, and perform surface finishing on the polished blank surface;

[0043] Step S2: Roughly machine the frame surface of the part, leaving a margin T1 on the side of the rib 1 on the frame surface of the part and a margin T2 on the web surface of the part.

[0044] Step S3: Roughly machine the smooth surface of the part, leaving a margin T3 on the side of the set pseudo feature rib 2 and a margin T4 on the web surface of the part;

[0045] Step S4: Finish the frame surface of the part and remove the excess material T1 on the side of the frame rib 1 and the excess material T2 on the web surface of the part;

[0046] Step S5: Finish the part to the desired smooth surface, remove the false feature rib 2, side allowance T3, and web allowance T4;

[0047] In this embodiment, the number and position of the pseudo-feature ribs 2 are consistent with the ribs 1 on the part frame surface, and the machining allowance is also consistent, that is, T1=T2=T3=T4. In this way, a groove cavity structure similar to the part frame surface is artificially constructed on the smooth surface of the part. This can ensure that the amount of material removed from the smooth surface and the frame surface of the part blank is basically the same during the removal of large allowances. This can effectively suppress the warping deformation caused by uneven distribution of internal stress after the part is processed.

[0048] Example 2:

[0049] like Figure 4 As shown in this embodiment, a method for controlling deformation during the processing of panel-type parts mainly includes the following steps:

[0050] All parts not covered in this invention are the same as or can be implemented using existing technologies.

[0051] Step S1: Select any one side of the blank as the polished surface of the part, and perform surface finishing on the polished blank surface;

[0052] Step S2: Roughly machine the frame surface of the part, leaving a margin T1 on the side of the rib 1 on the frame surface of the part and a margin T2 on the web surface of the part.

[0053] Step S3: Roughly machine the smooth surface of the part. No allowance is left on the side of the pseudo feature rib 2 and the web surface of the part, that is, T3 = T4 = 0.

[0054] Step S4: Finish the frame surface of the part and remove the excess material T1 on the side of the frame rib 1 and the excess material T2 on the web surface of the part;

[0055] Step S5: Finish the part to achieve a smooth surface and remove the false feature ribs 2;

[0056] In this embodiment, the number and position of the pseudo-feature ribs 2 are consistent with the ribs 1 on the frame surface of the part. However, when rough machining the smooth surface of the part, no allowance is left on the side of the pseudo-feature ribs 2 and the web surface. This causes the amount of smooth surface material removed during the removal of large allowances in the part blank to be slightly greater than that on the frame surface, thereby affecting the internal stress distribution after the part is machined, so as to achieve fine adjustment of the deformation of the part after machining.

[0057] Example 3:

[0058] like Figure 5 As shown in this embodiment, a method for controlling deformation during the processing of panel-type parts mainly includes the following steps:

[0059] All parts not covered in this invention are the same as or can be implemented using existing technologies.

[0060] Step S1: Select any one side of the blank as the polished surface of the part, and perform surface finishing on the polished blank surface;

[0061] Step S2: Roughly machine the frame surface of the part, leaving a margin T1 on the side of the rib 1 on the frame surface of the part and a margin T2 on the web surface of the part.

[0062] Step S3: Roughly machine the smooth surface of the part, leaving a margin T3 on the side of the set pseudo feature rib 2 and a margin T4 on the web surface of the part;

[0063] Step S4: Finish the frame surface of the part and remove the excess material T1 on the side of the frame rib 1 and the excess material T2 on the web surface of the part;

[0064] Step S5: Finish the part to the desired smooth surface, remove the false feature rib 2, side allowance T3, and web allowance T4;

[0065] In this embodiment, the position of the pseudo-feature rib 2 is consistent with that of the part frame rib 1, and the machining allowance is also consistent, i.e., T1=T2=T3=T4, but the number is different from that of the frame rib. This causes a slight difference in the amount of material removed from the smooth surface and the frame surface during the removal of large allowances from the part blank, thereby affecting the internal stress distribution after the part is machined, so as to achieve fine adjustment of the deformation of the part after machining.

[0066] Example 4:

[0067] like Figure 6 , Figure 7 As shown in this embodiment, a method for controlling deformation during the processing of panel-type parts mainly includes the following steps:

[0068] All parts not covered in this invention are the same as or can be implemented using existing technologies.

[0069] Step S1: Select any one side of the blank as the polished surface of the part, and perform surface finishing on the polished blank surface;

[0070] Step S2: Roughly machine the frame surface of the part, leaving a margin T1 on the side of the rib 1 on the frame surface of the part and a margin T2 on the web surface of the part.

[0071] Step S3: Roughly machine the smooth surface of the part, leaving a margin T3 on the side of the set pseudo feature rib 2 and a margin T4 on the web surface of the part;

[0072] Step S4: Finish the frame surface of the part and remove the excess material T1 on the side of the frame rib 1 and the excess material T2 on the web surface of the part;

[0073] Step S5: Finish the part to the desired smooth surface, remove the false feature rib 2, side allowance T3, and web allowance T4;

[0074] In this embodiment, the number of pseudo-feature ribs 2 is consistent with that of the part frame ribs 1, and the machining allowance is also consistent, i.e., T1=T2=T3=T4, but the length is different from that of the frame ribs. This causes a slight difference in the amount of material removed from the smooth surface and the frame surface during the removal of large allowances from the part blank, thereby affecting the internal stress distribution after the part is machined, so as to achieve fine adjustment of the deformation of the part after machining.

[0075] Example 5:

[0076] like Figure 8 As shown in this embodiment, a method for controlling deformation during the processing of panel-type parts mainly includes the following steps:

[0077] All parts not covered in this invention are the same as or can be implemented using existing technologies.

[0078] Step S1: Select any one side of the blank as the polished surface of the part, and perform surface finishing on the polished blank surface;

[0079] Step S2: Roughly machine the frame surface of the part, leaving a margin T1 on the side of the rib 1 on the frame surface of the part and a margin T2 on the web surface of the part.

[0080] Step S3: Roughly machine the smooth surface of the part, leaving a margin T3 on the side of the pseudo feature rib 2 set along the length direction of the part and the side of the pseudo feature rib 4 set along the width direction, and leaving a margin T4 on the web surface of the part.

[0081] Step S4: Finish the frame surface of the part and remove the excess material T1 on the side of the frame rib 1 and the excess material T2 on the web surface of the part;

[0082] Step S5: Finish the part to the desired smooth surface, remove the false feature ribs 2 and 4, the side allowance T3, and the web allowance T4.

[0083] In this embodiment, the number and position of the pseudo-feature ribs 2 along the length of the part are consistent with the ribs 1 on the frame surface of the part, and the machining allowance is also consistent, that is, T1=T2=T3=T4. In addition, pseudo-feature ribs 4 are added in the width direction of the smooth surface of the part, so that there is a slight difference in the amount of material removed from the smooth surface and the frame surface during the removal of large allowances of the part blank, thereby affecting the internal stress distribution after the part is processed, so as to achieve fine adjustment of the deformation of the part after processing.

[0084] Example 6:

[0085] like Figure 9 As shown in this embodiment, a method for controlling deformation during the processing of panel-type parts mainly includes the following steps:

[0086] All parts not covered in this invention are the same as or can be implemented using existing technologies.

[0087] Step S1: Select any one side of the blank as the polished surface of the part, and perform surface finishing on the polished blank surface;

[0088] Step S2: Roughly machine the frame surface of the part, leaving a margin T1 on the side of the pseudo feature rib 4 set along the width direction of the part and the side of the frame rib 1 of the part, and leaving a margin T2 on the web surface of the part.

[0089] Step S3: Roughly machine the smooth surface of the part, leaving a margin T3 on the side of the set pseudo feature rib 2 and a margin T4 on the web surface of the part;

[0090] Step S4: Finish the part frame surface to the required position, remove the side allowance T1 of the part frame rib 1 and the side allowance T2 of the part web, and remove the pseudo feature rib 4 and side allowance T1 set along the width direction of the part.

[0091] Step S5: Finish the part to the desired smooth surface, remove the false feature rib 2, side allowance T3, and web allowance T4;

[0092] In this embodiment, the number and position of the pseudo-feature ribs 2 on the smooth surface of the part are consistent with those of the ribs 1 on the frame surface of the part, and the machining allowance is also consistent, that is, T1=T2=T3=T4. In addition, pseudo-feature ribs 4 are also set along the width direction on the frame surface of the part, so that there is a slight difference in the amount of material removed from the smooth surface and the frame surface during the removal of large allowances from the part blank, thereby affecting the internal stress distribution after the part is machined, so as to achieve fine adjustment of the deformation of the part after machining.

[0093] Example 7:

[0094] like Figure 10 As shown in this embodiment, a method for controlling deformation during the processing of panel-type parts mainly includes the following steps:

[0095] All parts not covered in this invention are the same as or can be implemented using existing technologies.

[0096] Step S1: Select any one side of the blank as the polished surface of the part, and perform surface finishing on the polished blank surface;

[0097] Step S2: Roughly machine the frame surface of the part, leaving a margin T1 on the side of the pseudo feature rib 4 set along the width direction of the part and the side of the frame rib 1 of the part, and leaving a margin T2 on the web surface of the part.

[0098] Step S3: Roughly machine the smooth surface of the part, leaving a margin T3 on the side of the pseudo feature rib 2 set along the length direction of the part and the side of the pseudo feature rib 4 set along the width direction, and leaving a margin T4 on the web surface of the part.

[0099] Step S4: Finish the part frame surface to the required position, remove the side allowance T1 of the part frame rib 1 and the side allowance T2 of the part web, and remove the pseudo feature rib 4 and side allowance T1 set along the width direction of the part.

[0100] Step S5: Finish the part to the desired smooth surface, remove the false feature ribs 2 and 4, the side allowance T3, and the web allowance T4.

[0101] In this embodiment, the number and position of the pseudo-feature ribs 2 on the smooth surface of the part are consistent with those on the frame surface of the part, and the machining allowance is also consistent, that is, T1=T2=T3=T4. In addition, pseudo-feature ribs 4 are also set on the smooth surface and the frame surface of the part along the width direction. In this way, a cavity structure similar to the frame surface of the part is artificially constructed on the smooth surface of the part. This can ensure that the amount of material removed from the smooth surface and the frame surface of the part is basically the same during the removal of large allowances of the part blank, and can effectively suppress the warping deformation caused by uneven distribution of internal stress after the part is processed.

[0102] Example 8:

[0103] like Figure 9 As shown in this embodiment, a method for controlling deformation during the processing of panel-type parts mainly includes the following steps:

[0104] All parts not covered in this invention are the same as or can be implemented using existing technologies.

[0105] Step S1: Select any one side of the blank as the polished surface of the part, and perform surface finishing on the polished blank surface;

[0106] Step S2: Roughly machine the frame surface of the part, retain the pseudo feature ribs 4 set along the width direction of the part, leave a margin T1 on the side of the ribs 1 on the frame surface of the part, and leave a margin T2 on the web surface of the part.

[0107] Step S3: Roughly machine the smooth surface of the part, leaving a margin T3 on the side of the set pseudo feature rib 2 and a margin T4 on the web surface of the part;

[0108] Step S4: Finish the part frame surface, remove the side allowance T1 of the part frame rib 1 and the web surface allowance T2, and retain the pseudo feature rib 4 set along the width direction of the part;

[0109] Step S5: Finish the part to the desired smooth surface, remove the false feature rib 2, side allowance T3, and web allowance T4;

[0110] Step S6: The part is corrected using the rolling correction method on the pseudo feature ribs 4 and the part frame ribs 1 set along the width direction on the part frame surface;

[0111] Step S7: Remove the pseudo-feature ribs 4 set along the width direction of the part frame surface;

[0112] In this embodiment, the number and position of the pseudo-feature ribs 2 on the smooth surface of the part are consistent with those of the ribs 1 on the frame surface of the part, and the machining allowance is also consistent, that is, T1=T2=T3=T4. In addition, pseudo-feature ribs 4 are also set along the width direction on the frame surface of the part, so that there is a slight difference in the amount of material removed from the smooth surface and the frame surface during the removal of large allowances of the part blank, thereby affecting the internal stress distribution after the part is processed, so as to achieve fine adjustment of the deformation of the part after processing. Rolling correction is added after the part is processed, which can further improve the deformation of the part.

[0113] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A method for controlling deformation during the machining of panel-type parts, characterized in that, Includes the following steps: Step S1: Select any one side of the blank as the polished surface of the part, and perform surface finishing on the polished blank surface; Step S2: Roughly machine the frame surface of the part, leaving a margin T1 on the side of the ribs and a margin T2 on the web surface of the part; when rough machining the frame surface of the part, it is necessary to ensure that T1 = T2. Step S3: Roughly machine the smooth surface of the part, leaving a margin T3 on the side of the set pseudo-feature rib and a margin T4 on the web surface of the part; when rough machining the smooth surface of the part, it is necessary to ensure that T3 = T4; the thickness and height of the pseudo-feature rib should be consistent with the frame rib. Step S4: Finish the frame surface of the part to the required position, and remove the excess material T1 on the side of the part and the excess material T2 on the web surface of the part; Step S5: Finish the part to the desired smooth surface, remove the false feature ribs, side allowance T3, and web allowance T4.

2. The method for controlling deformation during machining of panel-type parts according to claim 1, characterized in that, In step S1, a stress-free method is used to finish the smooth surface of the part blank to ensure the accuracy of the smooth surface finishing.

3. A method for controlling deformation during the processing of panel-type parts according to claim 1 or 2, characterized in that, In step S2, when roughing the surface of the part frame, a layer-first milling method should be used to ensure that the residual stress in the blank is released stably and orderly.

4. A method for controlling deformation during the processing of panel-type parts according to claim 1 or 2, characterized in that, In step S3, when roughing the smooth surface of the part, the milling method used should be consistent with that in step S2.

5. The method for controlling deformation during machining of panel-type parts according to claim 1, characterized in that, In step S3, the number, length, and position of the pseudo-feature ribs can be consistent with the frame ribs, or they can be adjusted according to the actual deformation of the part.

6. A method for controlling deformation during the processing of panel-type parts according to claim 1 or 2, characterized in that, In step S4, when finishing the frame surface of the part, the processing sequence should be to first remove the excess material T2 from the web surface of the part, and then remove the excess material T1 from the side surface of the part.

7. A method for controlling deformation during the processing of panel-type parts according to claim 1 or 2, characterized in that, In step S5, when finishing the smooth surface of the part, the processing sequence should be as follows: first remove the side allowance T3 of the pseudo feature rib of the part, then remove the pseudo feature rib of the part, and finally remove the web surface allowance T4.

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