Method for producing and processing a curved profiled part

Abstract

The application belongs to the technical field of curved surface special-shaped part production and processing, and particularly relates to a characteristic production and processing method of a curved surface special-shaped part, which comprises the following steps: S1, preparing a part rotary body three-dimensional schematic diagram according to a longitudinal section of a part to be processed; S2, obtaining a part rotary body blank according to the prepared part rotary body three-dimensional schematic diagram; S3, using a precision numerical control lathe to perform turning processing on two end faces, an inner curved surface and an outer curved surface of the part rotary body blank; S4, using a segmentation device to segment the part rotary body blank after the turning processing into a plurality of independent part blanks; and S5, using a milling device to perform size and chamfer forming processing on each segmented part blank, that is, completing the entire processing process of the part to be processed. Through the generation of the part to be processed into a rotary body and the segmentation, the complex, low-efficiency and low-precision milling processing is converted into simple, high-efficiency and high-precision turning processing, and the processing efficiency and processing quality of the workpiece are effectively improved.

Description

Technical Field

[0001] This invention relates to a method for manufacturing and processing irregularly shaped curved parts, belonging to the field of technical technology for manufacturing and processing irregularly shaped curved parts. Background Technology

[0002] With the rapid development of technology, intelligentization and informatization have entered a stage of rapid development, and the external shapes of parts are becoming increasingly complex. The types of curved, spherical, and irregularly shaped parts are also increasing, which places strict requirements on the processing methods. In particular, irregularly shaped parts with curved surfaces are quite common in the mechanical processing industry. For such parts, the commonly used production and processing method in the existing technology is to use a machining center for milling. For example, CN105290712A discloses a processing method for curved surface parts, and CN105382313A discloses a CNC milling method for thin-walled curved irregularly shaped parts.

[0003] When using a machining center to mill curved and irregularly shaped parts, the CNC toolpath programming is relatively complex due to the use of ball end mills. The depth of cut and step distance settings are relatively small, resulting in a long machining time and low machining efficiency. Furthermore, during the machining of curved surfaces, vibration and trembling are prone to occur, which leads to poor surface finish on the inner and outer surfaces of the machined parts, affecting the production quality of the parts. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a method for manufacturing and processing curved irregular parts that can improve processing efficiency and processing quality.

[0005] The method for manufacturing irregularly shaped curved parts according to the present invention includes the following steps:

[0006] S1. Create a three-dimensional schematic diagram of the rotating body of the part based on the longitudinal section of the part to be processed;

[0007] S2, Obtain the part blank based on the 3D schematic diagram of the part's rotating body;

[0008] S3, using a precision CNC lathe to machine the two end faces, inner curved surface and outer curved surface of the workpiece blank;

[0009] S4, using a dividing device to divide the machined part of rotation into several independent part blanks;

[0010] S5 uses milling equipment to perform dimensional and chamfering shaping on the divided part blanks, thus completing the entire processing of the parts to be processed.

[0011] Furthermore, the process of creating the three-dimensional schematic diagram of the rotating part in S1 is as follows: First, use three-dimensional software to cut the part to be processed along the longitudinal center line and project the curve. Then, rotate the projected curve one revolution to form the three-dimensional schematic diagram of the rotating part.

[0012] Furthermore, the part blank obtained in S2 is cylindrical.

[0013] Furthermore, the specific steps for dividing the rotating blank of the part in S4 are as follows: first, the rotating blank of the part is positioned and clamped using a dividing fixture, and then the dividing fixture is clamped on the dividing device to perform the dividing operation of the rotating blank of the part.

[0014] Furthermore, the dividing fixture includes a dividing body and a dividing top plate. The dividing body is provided with a dividing clamping part and an end face groove. The dividing top plate is provided with an inner positioning hole and a central positioning hole. The dividing body and the dividing top plate are provided with a plurality of saw blade routing grooves. A positioning component is provided between the dividing body and the dividing top plate. The outer arc surface of the dividing body fits in shape with the inner arc surface of the workpiece blank. The end face groove and the inner positioning hole cooperate to position and clamp the workpiece blank. The positioning component is used to ensure that the positions of the saw blade routing grooves on the dividing body and the dividing top plate are consistent each time they are clamped. The dividing clamping part is used for clamping by the chuck of the dividing equipment. The central positioning hole is used for supporting the top of the dividing equipment, thereby completing the clamping of the dividing fixture. Then the saw blades of the dividing equipment can perform the dividing operation on the workpiece blank through the saw blade routing grooves, thereby dividing the workpiece blank into a plurality of workpiece blanks.

[0015] Furthermore, the positioning component includes a positioning pin connected to the segmentation body, and the top segmentation plate is provided with an alignment positioning hole that corresponds to and matches the positioning pin.

[0016] Furthermore, the forming process of the part blank in S5 is specifically as follows: first, the part blank is clamped by a double-sided milling fixture, then the double-sided milling fixture is clamped on a milling machine to perform double-sided milling and chamfering operations on the part blank, then the part blank is removed from the double-sided milling fixture and clamped in a large-end milling fixture, and then the large-end milling fixture is clamped on a milling machine to perform large-end milling and drilling operations on the part blank.

[0017] Furthermore, the milling double-sided fixture includes a milling double-sided main body, one end of which is provided with a milling double-sided clamping part, and the other end of which is provided with a workpiece positioning groove. Both sides of the workpiece positioning groove are provided with flat milling cutter routing grooves. A first conforming pressure block and a second conforming pressure block are detachably connected to the milling double-sided main body. The workpiece positioning groove conforms to the two end faces and the outer curved surface of the workpiece. The bottom surface of the first conforming pressure block conforms to the inner curved surface of the large end of the workpiece. The bottom surface of the second conforming pressure block conforms to the inner curved surface of the workpiece. The milling double-sided clamping part is used to clamp on the chuck of the milling equipment. Then, the flat milling cutter of the milling equipment can perform double-sided milling and chamfering operations on the workpiece through the flat milling cutter routing groove.

[0018] Furthermore, the milling head fixture includes a milling head body, which is provided with a milling head clamping part and a milling head positioning groove. A corresponding pressure plate is provided for the milling head positioning groove. Multiple pressure blocks corresponding to the corresponding pressure plates are detachably connected to the milling head body. The bottom surface of the milling head positioning groove conforms to the outer curved surface of the workpiece blank. The two sides and the tip surface of the workpiece blank are conforming to the milling head positioning groove. The bottom surface of the corresponding pressure plate conforms to the inner curved surface of the workpiece blank. The milling head clamping part is used to clamp on the chuck of the milling equipment. Then the milling equipment can perform milling head and drilling operations on the workpiece blank.

[0019] The beneficial effects of this invention compared to the prior art are:

[0020] The method for manufacturing and processing curved irregular parts described in this invention transforms complex, inefficient, and low-precision milling into simple, efficient, and high-precision turning by generating and dividing the part to be processed into a rotating body, thereby effectively improving the processing efficiency and quality of the workpiece. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the part to be processed in an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the structure of the rotating blank of the part in an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the segmentation tooling in an embodiment of the present invention;

[0024] Figure 4 yes Figure 3 Top view;

[0025] Figure 5 yes Figure 4 Sectional view at point AA;

[0026] Figure 6 This is a schematic diagram of the structure of the double-sided milling tooling in an embodiment of the present invention;

[0027] Figure 7 This is a schematic diagram of the milling head tool in an embodiment of the present invention.

[0028] In the diagram: 1. Segmentation body; 2. Segmentation clamping part; 3. Saw blade cutting groove; 4. Part blank; 5. Segmentation top plate; 6. Center positioning hole; 7. Positioning pin; 8. Alignment positioning hole; 9. End face groove; 10. Inner positioning hole; 11. Milling double-sided body; 12. Milling double-sided clamping part; 13. Flat milling cutter cutting groove; 14. First conforming pressure block; 15. Second conforming pressure block; 16. Milling large-end body; 17. Milling large-end clamping part; 18. Milling large-end positioning groove; 19. Pressure block; 20. Conforming pressure plate. Detailed Implementation

[0029] The embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0030] Example 1:

[0031] Taking the production and processing of tail fin drag strips as an example, the structure of tail fin drag strips is as follows: Figure 1 As shown, the original machining method is as follows: a five-axis machining center is used to mill the blank part throughout the entire process. The process route is milling the shape → fixing the total height. Ball end mills are used for machining. This requires layer milling, small depth of cut and step distance, low efficiency, long machining time, and the ball end mill is unstable when machining curved surfaces, resulting in chatter and poor surface finish. The machining time is about 120 minutes per piece.

[0032] This solution uses a turning-instead-of-milling machining method. The optimized process route is: finish turning one end → finish turning the other end → dividing → milling and chamfering → milling the big end and drilling.

[0033] The method for manufacturing and processing irregularly shaped curved parts according to the present invention includes the following steps:

[0034] S1. First, use 3D software to cut the part to be processed along the longitudinal center line and project the curve. Then rotate the projected curve one revolution to create a 3D schematic diagram of the part in revolution.

[0035] S2, Obtain the part blank based on the 3D schematic diagram of the part of revolution. The structure of the part blank of revolution is as follows: Figure 2 As shown;

[0036] S3. Since the workpiece blank is cylindrical, both ends can be directly clamped on the chuck of a precision CNC lathe, and the two end faces, inner curved surface and outer curved surface of the workpiece blank can be machined by the precision CNC lathe.

[0037] S4, using segmented tooling to position and clamp the rotating blank of the part, such as Figures 3 to 5As shown, the dividing fixture includes a dividing body 1 and a dividing top plate 5. The dividing body 1 is provided with a dividing clamping part 2 and an end face groove 9. The dividing top plate 5 is provided with an inner positioning hole 10 and a central positioning hole 6. The dividing body 1 and the dividing top plate 5 are respectively provided with a plurality of saw blade routing grooves 3. A positioning component is provided between the dividing body 1 and the dividing top plate 5. The positioning component includes a positioning pin 7 connected to the dividing body 1. The dividing top plate 5 is provided with an alignment positioning hole 8 that corresponds to and matches the positioning pin 7. Since the positioning pin 7 is eccentrically set, the alignment of the saw blade routing grooves 3 can be completed by inserting the positioning pin 7 into the alignment positioning hole 8. The outer arc surface of the main body 1 fits in shape with the inner arc surface of the part rotating blank. The end face groove 9 and the inner positioning hole 10 are used to position and clamp the part rotating blank. The positioning component is used to ensure that the position of the dividing main body 1 and the saw blade routing groove 3 on the dividing top plate 5 are consistent each time they are clamped. The dividing clamping part 2 is used for the chuck clamping of the dividing equipment. The center positioning hole 6 is used for the top support of the dividing equipment, thereby completing the clamping of the dividing fixture. Then the saw blade of the dividing equipment can perform the dividing operation on the part rotating blank through the saw blade routing groove 3, thereby dividing the part rotating blank into several independent part blanks 4.

[0038] S5, firstly, the blank part 4 is clamped using a double-sided milling fixture, such as... Figure 6 As shown, the milling double-sided fixture includes a milling double-sided body 11. One end of the milling double-sided body 11 is provided with a milling double-sided clamping part 12, and the other end of the milling double-sided body 11 is provided with a workpiece positioning groove. Both sides of the workpiece positioning groove are provided with milling cutter routing grooves 13. A first conforming pressure block 14 and a second conforming pressure block 15 are detachably connected to the milling double-sided body 11. The workpiece positioning groove conforms to the two end faces and outer curved surfaces of the workpiece 4. The bottom surface of the first conforming pressure block 14 conforms to the inner curved surface of the large end of the workpiece 4. The bottom surface of the second conforming pressure block 15 conforms to the inner curved surface of the workpiece 4. The milling double-sided clamping part 12 is used to clamp on the chuck of the milling equipment. Then, the milling cutter of the milling equipment can perform double-sided milling and chamfering operations on the workpiece 4 through the milling cutter routing grooves 13. Then, the workpiece 4 is removed from the milling double-sided fixture and clamped in the milling large end fixture, as shown. Figure 7As shown, the milling head fixture includes a milling head body 16, a milling head clamping part 17 and a milling head positioning groove 18 on the milling head body 16, and a corresponding pressure plate 20 on the milling head positioning groove 18. Multiple pressure blocks 19 corresponding to the corresponding pressure plates 20 are detachably connected to the milling head body 16. The bottom surface of the milling head positioning groove 18 conforms to the outer curved surface of the workpiece blank 4, and the two sides and the tip surface of the workpiece blank 4 are all in contact with the milling head positioning groove 18. The bottom surface of the corresponding pressure plate 20 conforms to the inner curved surface of the workpiece blank 4. The milling head clamping part 17 is used to clamp on the chuck of the milling equipment, and then the milling equipment can perform milling head and drilling operations on the workpiece blank 4, thereby completing the entire processing process.

[0039] The machining method of replacing milling with turning in this invention reduces the original processing time of about 120 minutes per piece to about 30 minutes, which greatly improves the processing efficiency.

Claims

1. A method for producing and processing a curved profiled part, characterized in that, It comprises the following steps: S1, making a three-dimensional schematic diagram of a part rotation body according to a longitudinal section of a part to be processed; S2, obtaining a part rotation body blank according to the three-dimensional schematic diagram of the part rotation body; S3, using a precision numerical control lathe to perform turning processing on the two end faces, inner curved surface and outer curved surface of the part rotation body blank; S4, using a dividing device to divide the part rotation body blank after turning processing into a plurality of independent part blanks (4), specifically: first, using a dividing tool to position and clamp the part rotation body blank, and then clamping the dividing tool on the dividing device to perform part rotation body blank dividing operation; the dividing tool comprises a dividing main body (1) and a dividing top disc (5), the dividing main body (1) is provided with a dividing clamping part (2) and an end face groove (9), the dividing top disc (5) is provided with an inner positioning hole (10) and a center positioning hole (6), the dividing main body (1) and the dividing top disc (5) are correspondingly provided with a plurality of saw blade routing grooves (3), a positioning assembly is arranged between the dividing main body (1) and the dividing top disc (5), the outer circular arc surface of the dividing main body (1) is in symmetrical fitting with the inner arc surface of the part rotation body blank, the end face groove (9) and the inner positioning hole (10) are matched to position and clamp the part rotation body blank, the positioning assembly is used to ensure that the saw blade routing grooves (3) on the dividing main body (1) and the dividing top disc (5) are in the same position each time clamping, the dividing clamping part (2) is used for chuck clamping of the dividing device, the center positioning hole (6) is used for center clamping of the dividing device, so that the clamping of the dividing tool is completed, and then the saw blade of the dividing device can pass through the saw blade routing groove (3) to perform the dividing operation on the part rotation body blank, so that the part rotation body blank is divided into a plurality of part blanks (4); S5, using a milling device to perform size and chamfer forming processing on each part blank (4) after dividing, that is, completing the whole processing process of the part to be processed.

2. The method of claim 1, wherein The manufacturing process of the three-dimensional schematic diagram of the part rotation body in S1 is specifically: first, using three-dimensional software to cut the part to be processed along the longitudinal center line and project the curve, and then rotating the projected curve for one turn to form the three-dimensional schematic diagram of the part rotation body.

3. The method of claim 1, wherein the method further comprises: The part rotation body blank obtained in S2 is cylindrical.

4. The method of claim 1, wherein The positioning assembly comprises a positioning pin (7) connected to the dividing main body (1), and the dividing top disc (5) is provided with a correct positioning hole (8) corresponding to and adapted to the positioning pin (7).

5. The method according to any one of claims 1 to 4, wherein The forming processing of the part blank (4) in S5 is as follows: first, clamping the part blank (4) through a milling double-side tool, then clamping the milling double-side tool on the milling device to perform milling double-side and chamfer processing of the part blank (4), then dismounting the part blank (4) from the milling double-side tool and clamping it in a milling large-head tool, and then clamping the milling large-head tool on the milling device to perform milling large-head and drilling processing of the part blank (4).

6. The method of claim 5, wherein the method further comprises: The milling double edge tool includes a milling double edge body (11), one end of the milling double edge body (11) is provided with a milling double edge clamping part (12), the other end of the milling double edge body (11) is provided with a part blank positioning groove, both sides of the part blank positioning groove are provided with a flat milling cutter routing groove (13), the milling double edge body (11) is detachably connected with a first symbol type pressing block (14) and a second symbol type pressing block (15), the part blank positioning groove is in symbol type fit with two end faces and an outer curved surface of a part blank (4), a bottom surface of the first symbol type pressing block (14) is in symbol type fit with an inner curved surface of a large end of the part blank (4), a bottom surface of the second symbol type pressing block (15) is in symbol type fit with the inner curved surface of the part blank (4), the milling double edge clamping part (12) is used for clamping on a chuck of a milling device, then a flat milling cutter of the milling device can pass through the flat milling cutter routing groove (13) to perform milling double edge and chamfering work on the part blank (4).

7. The method of claim 6, wherein the method further comprises: The milling big end tool includes a milling big end body (16), the milling big end body (16) is provided with a milling big end clamping part (17) and a milling big end positioning groove (18), a symbol type pressing plate (20) is arranged corresponding to the milling big end positioning groove (18), a plurality of pressing blocks (19) corresponding to the symbol type pressing plate (20) are detachably connected on the milling big end body (16), a bottom surface of the milling big end positioning groove (18) is in symbol type fit with an outer curved surface of the part blank (4), both side faces and a pointed end face of the part blank (4) are in fit with the milling big end positioning groove (18), a bottom surface of the symbol type pressing plate (20) is in symbol type fit with an inner curved surface of the part blank (4), the milling big end clamping part (17) is used for clamping on a chuck of a milling device, then the milling device can perform milling big end and drilling work on the part blank (4).

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