CNC tool for precisely positioning profile of aluminum profile and application method of CNC tool

Abstract

The invention discloses a CNC tool for precisely positioning the profile of an aluminum profile and an application method of the CNC tool. The tool comprises a tool bottom plate provided with a positioning column and an oil pipe joint, and stations of at least two procedures on the tool bottom plate. The station comprises a profiling seat, a groove of the profiling seat is used for containing the outer contour of the aluminum profile, and a hydraulically-driven lateral clamping block and a positioning pin are arranged in the groove. And the positioning pins are divided into two groups for positioning the coarse reference holes and the fine reference holes. The method comprises the steps that S1, the aluminum profile is positioned through a rough datum hole and an outer contour, a fine datum hole and two vertical faces are machined in one-time clamping, a first step face is formed, and the area where the rough datum hole is located is reserved as allowance; and S2, positioning the semi-finished product by the fine reference hole, the outer contour and the first step surface, and cutting an area containing the coarse reference hole during processing to form a second step surface. By means of the profiling positioning and reference transition technology, three traditional procedures are combined into two procedures, the clamping frequency and clamp input are reduced, and meanwhile the machining precision and efficiency are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of CNC tooling technology, and in particular to a CNC tooling for precise positioning of the aluminum profile of an automobile tailgate support rod bracket. Background Technology

[0002] CNC fixtures are devices used on machine tools to clamp workpieces and guide cutting tools. They are specifically designed for a particular workpiece and a specific machining process. Their characteristics include compact structure, quick and convenient operation, and labor-saving operation, ensuring high machining accuracy and production efficiency. They contact the workpiece's positioning datum to determine the workpiece's correct position within the fixture, thereby ensuring the correct relative position of the workpiece with respect to the cutting tool and machine tool movements during machining.

[0003] The tailgate support rod bracket is a component in the tailgate system that secures the support rod. It is the actuator that enables the tailgate to open and close, and a specialized part for adjusting the tailgate opening size. Its function is to ensure smooth operation and easy opening and closing of the tailgate. The tailgate support rod bracket involves machining processes, and the fixture is a crucial element in these processes, playing a key role in ensuring the execution of the machining process and maintaining quality.

[0004] Traditional machining fixtures for automotive tailgate support rod brackets (with aluminum profiles as the raw material) typically employ three processes: the first process involves machining a reference hole; the second process, using the reference hole for positioning, involves machining other holes and planes; and the third process, using the reference hole for positioning, involves machining another plane. This process route has the following drawbacks:

[0005] 1. The processes are scattered, the dimensional chain is not easy to control, and it is difficult to guarantee stable machining quality.

[0006] 2. The required number of fixtures is large, the investment cost is high, and the economic efficiency is poor. Summary of the Invention

[0007] The purpose of this invention is to provide a CNC fixture for precise positioning of aluminum profiles that reduces the number of clamping operations, improves machining accuracy, and lowers fixture costs.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A CNC fixture for precise positioning of aluminum profiles includes a fixture base plate, wherein the fixture base plate is provided with positioning columns for connection to a machine tool and oil pipe joints for connection to hydraulic pressure, characterized in that it further includes workstations for at least two processes installed on the fixture base plate;

[0010] The workstation includes a contouring seat with an open contouring groove on one side. At least three sets of clamping blocks are provided within the contouring groove. The space formed by the three sets of clamping blocks and the contouring groove is used to accommodate the outer contour of the aluminum profile to be processed. At least two surfaces of the aluminum profile to be processed are open on the contouring seat for processing. The three sets of clamping blocks are connected to an oil pipe connector, which drives the three sets of clamping blocks to press the aluminum profile from the side.

[0011] The contoured groove is also provided with a positioning pin, which corresponds to the positioning hole reserved on the aluminum profile and is used to position the aluminum profile to be processed.

[0012] Preferably, the positioning pins include cylindrical pin one, cylindrical pin two and chamfered pin one for coarse datum positioning, and cylindrical pin three, cylindrical pin four and chamfered pin two for fine datum positioning.

[0013] Among them, cylindrical pin one and cylindrical pin two constitute the coarse reference positioning element, which is used to position the coarse reference hole reserved on the aluminum profile to be processed; cylindrical pin three and cylindrical pin four constitute the fine reference positioning element, which is used to position the fine reference hole formed after the first process.

[0014] Preferably, the workstation includes a first contouring seat and a second contouring seat arranged side by side;

[0015] The first contouring seat has a contouring groove, and the contouring groove has clamping block one, clamping block two and clamping block three. The space formed by clamping block one, clamping block two and clamping block three and the contouring groove is used to accommodate the outer contour of the L-shaped aluminum profile to be processed.

[0016] The clamping blocks one, two, and three are located on the inner side of the aluminum profile. The clamping blocks one, two, and three are connected to the drive ends of three oil pipe joints. The clamping blocks one, two, and three are driven by the oil pipe joints to lift and press the aluminum profile from the inner side, so that the outer contour plane of the aluminum profile fits the corresponding inner wall of the contour groove.

[0017] The second contouring seat has a contouring groove, and the contouring groove is provided with clamping block four, clamping block five and clamping block six. The space formed by the clamping block four, clamping block five and clamping block six and the contouring groove is used to accommodate the outer contour of the aluminum profile processed from the first contouring seat.

[0018] The clamping blocks four, five, and six are located on the inner side of the aluminum profile. The clamping blocks four, five, and six are connected to the drive ends of three other oil pipe joints. The clamping blocks four, five, and six are driven by the oil pipe joints to lift and press the aluminum profile from the side, so that the outer contour plane of the aluminum profile fits the corresponding inner wall of the contour groove.

[0019] Preferably, the second contouring base is provided with a Z-direction positioning boss, the height of which is consistent with the height difference of the aluminum profile after it has been processed from the first contouring base, and is used to support the stepped surface formed on the aluminum profile after processing by the first contouring base.

[0020] In addition, the present invention also provides an application method for a CNC tooling for precise positioning of aluminum profiles, comprising the following steps:

[0021] Step S1, First clamping and machining:

[0022] Step S11: Place the aluminum profile to be processed into the first contouring seat of the first station, so that its outer contour is embedded in the contouring groove.

[0023] Align the pre-drilled rough reference hole on the aluminum profile with the cylindrical pin 1, cylindrical pin 2 and chamfered pin 1 in the contour groove and fit them in to complete the positioning;

[0024] Step S12: Drive clamping block one, clamping block two, and clamping block three from the inner side of the aluminum profile through the oil pipe joint to lift and press them tightly, so that the outer contour plane of the aluminum profile fits tightly against the inner wall of the contour groove of the contour seat one.

[0025] Step S13: Using a four-axis CNC machine tool, the first step surface of the aluminum profile is machined on the contour base by rotating the four axes.

[0026] Step S2, Second clamping and machining:

[0027] Step S21: Place the aluminum profile processed in step S as a semi-finished product in the contouring seat 2, so that its outer contour is embedded in its contouring groove.

[0028] Step S22: Align the precision reference hole machined in step S on the aluminum profile with the cylindrical pin three, cylindrical pin four and chamfered pin two in the contour groove and fit them in to complete the initial positioning;

[0029] At the same time, the first step surface formed in step S is made to fit against the Z-direction positioning boss set on the second contouring seat to complete the secondary positioning;

[0030] Step S23: Drive clamping blocks four, five, and six from the inner side of the aluminum profile through the oil pipe joint to lift and press them tightly, so that the outer contour plane of the aluminum profile fits tightly against the inner wall of the contour groove of the contour seat two, and complete the final clamping.

[0031] Step S24: Using a four-axis CNC machine tool, the second step surface of the aluminum profile is machined on the second profile holder by rotating the four axes.

[0032] Preferably, in step S1, the pressing direction of clamping block one, clamping block two, and clamping block three is the same as the pressing direction of clamping block four, clamping block five, and clamping block six in step S2, all pressing outward from the inner side of the aluminum profile so that the outer plane of the aluminum profile fits against the groove sidewall of the contour seat.

[0033] Preferably, in step S2, the support of the Z-direction positioning boss on the stepped surface, combined with the positioning of the precision reference hole, jointly restricts the displacement space of the aluminum profile in the second processing.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] 1. This invention achieves high-precision fit between the contoured groove and the outer contour of the profile, particularly by utilizing the plane of the profile's shape for positioning. This minimizes the fit clearance, solving the problems of inaccurate positioning and poor repeatability of traditional fixtures. After the workpiece is inserted, its six degrees of freedom are fully restricted, ensuring a highly consistent absolute machining position for each product. This fundamentally guarantees the accuracy of product dimensions and geometric tolerances, significantly improving product quality.

[0036] 2. This invention, through the structural design of the contour base, keeps the two mutually perpendicular surfaces to be machined on the workpiece open and free from interference. Combined with the rotation function of a four-axis CNC machine tool, it solves the problem of previously requiring multiple clamping operations to machine multiple surfaces. This invention enables the completion of all machining operations on two key surfaces in a single clamping operation, not only reducing clamping errors but also significantly improving machining efficiency.

[0037] 3. This invention innovatively employs a process strategy of "coarse datum hole positioning and fine machining followed by removal," solving the problem of inconsistent datums caused by the multiple machining operations of the datum hole and important features. In the first clamping, the workpiece's inherent coarse datum hole is used for positioning, and the final required fine datum hole and other important features are machined simultaneously, ensuring a high-precision relative positional relationship between these features. Subsequently, in the second clamping, the material area containing the coarse datum hole is removed as machining allowance, utilizing the positioning function of the coarse datum without affecting the conformity of the final product.

[0038] 4. This invention solves the problem of workpiece displacement or deformation caused by traditional end-face clamping methods by setting up multiple hydraulically driven lateral clamping blocks to apply lifting and clamping force from the inside of the workpiece contour. This clamping method ensures that the outer contour plane of the workpiece is strongly adhered to the corresponding inner wall of the contour holder, with large and stable clamping force, effectively preventing any micro-movement of the workpiece in the horizontal direction during processing, and further ensuring processing accuracy.

[0039] 5. In this invention, a Z-axis positioning boss is set on the contouring seat in the second process. Its height precisely matches the height of the stepped surface processed in the first process, solving the problem of unstable positioning and deformation caused by the workpiece being suspended during the second clamping. This boss provides solid Z-axis support for the workpiece, and combined with the positioning of the precision reference hole, it forms a complete positioning of "one surface and two holes," ensuring the absolute stability of the workpiece in the height direction during the second processing and preventing processing deformation.

[0040] In summary, this invention optimizes the traditional process requiring three sets of fixtures and three clamping operations into a single integrated fixture and two clamping operations by integrating core designs such as contour positioning, multi-face one-time machining, transition datum process, hydraulic lateral clamping, and Z-axis auxiliary support.

[0041] This invention fundamentally solves the comprehensive problems caused by dispersed processes and numerous fixtures, such as large cumulative errors, difficulty in quality control, high fixture investment costs, and long manufacturing and sample delivery cycles. The ultimate effect is to achieve higher machining quality and stability while significantly reducing the number of fixtures, lowering production costs, and significantly shortening product development and manufacturing cycles, resulting in a marked improvement in economic benefits. Attached Figure Description

[0042] Figure 1 A schematic diagram of a contouring seat structure for the first process in a CNC tooling for precise positioning of aluminum profiles, provided for an embodiment of the present invention;

[0043] Figure 2 for Figure 1 A schematic diagram showing the use of aluminum profiles after they have been placed inside.

[0044] Figure 3 for Figure 2 A schematic diagram of the structure after cutting following the first process;

[0045] Figure 4 A schematic diagram of the second process of the contouring seat in the CNC tooling for precise positioning of aluminum profiles, provided for an embodiment of the present invention;

[0046] Figure 5 for Figure 4 A diagram showing the aluminum profile after being reversed and placed inside the center, following the first processing step.

[0047] Figure 6 for Figure 5 A schematic diagram of the structure after cutting following the second process;

[0048] Figure 7 A top view schematic diagram of an aluminum profile outline precision positioning CNC tooling integrating the first and second processes, provided for an embodiment of the present invention;

[0049] Figure 8 This is a side view diagram of an aluminum profile shape precision positioning CNC tooling integrating the first and second processes, provided as an embodiment of the present invention.

[0050] The serial numbers in the diagram are as follows:

[0051] 1. Contouring base one; 2. Chamfered pin one; 3. Clamping block one; 4. Cylindrical pin one; 5. Clamping block two; 6. Aluminum profile; 6-1. First step surface; 6-2. Second step surface; 7. Clamping block three; 8. Cylindrical pin two; 9. Contouring base two; 10. Cylindrical pin three; 11. Clamping block four; 12. Clamping block five; 13. Chamfered pin two; 14. Cylindrical pin four; 15. Clamping block six; 16. Positioning boss; 17. Tooling base plate positioning post; 18. Tooling base plate; 19. Oil pipe joint. Detailed Implementation

[0052] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0053] like Figure 7 and Figure 8 As shown, this embodiment provides a CNC fixture for precise positioning of aluminum profiles, including a fixture base plate 18, a positioning post 17 for connecting to a machine tool and an oil pipe connector 19 for connecting to hydraulic pressure, and a workstation for at least two processes installed on the fixture base plate 18.

[0054] In this embodiment, the workstations for the two processes each include a first contouring seat 1 and a second contouring seat 9 arranged side by side.

[0055] like Figures 1 to 3 As shown, a contouring groove is provided in the contouring seat 1. Clamping block 1 3, clamping block 2 5 and clamping block 3 7 are provided in the contouring groove. The space formed by clamping block 1 3, clamping block 2 5 and clamping block 3 7 and the contouring groove is used to accommodate the outer contour of the L-shaped aluminum profile 6 to be processed.

[0056] Clamping block 1 3, clamping block 2 5 and clamping block 3 7 are located on the inner side of aluminum profile 6. Clamping block 1 3, clamping block 2 5 and clamping block 3 7 are respectively connected to the driving end of three oil pipe joints 19. Through the oil pipe joints 19, clamping block 1 3, clamping block 2 5 and clamping block 3 7 are driven to lift and press aluminum profile 6 from the inner side, so that the outer contour plane of aluminum profile 6 fits the corresponding inner wall of the contour groove.

[0057] like Figures 4 to 6As shown, a contouring groove is provided in the contouring seat 2 9, and clamping blocks 4 11, 5 12 and 6 15 are provided in the contouring groove. The space formed by clamping blocks 4 11, 5 12 and 6 15 and the contouring groove is used to accommodate the outer contour of the aluminum profile 6 processed from the contouring seat 1.

[0058] Clamping blocks 41, 512 and 615 are located on the inner side of aluminum profile 6. Clamping blocks 41, 512 and 615 are connected to the drive ends of three other oil pipe joints 19. Through the oil pipe joints 19, clamping blocks 41, 512 and 615 are driven to lift and press aluminum profile 6 from the side, so that the outer contour plane of aluminum profile 6 fits the corresponding inner wall of the contour groove.

[0059] The contoured groove is also equipped with positioning pins, which correspond to the positioning holes reserved on the aluminum profile 6 and are used to position the aluminum profile 6 to be processed. In this embodiment, the positioning pins include cylindrical pin 1 4, cylindrical pin 2 8 and chamfered pin 1 2 for rough datum positioning, and cylindrical pin 3 10, cylindrical pin 4 14 and chamfered pin 2 13 for fine datum positioning; wherein, cylindrical pin 1 4 and cylindrical pin 2 8 constitute the rough datum positioning elements and are used to position the rough datum holes reserved on the aluminum profile 6 blank; cylindrical pin 3 10 and cylindrical pin 4 14 constitute the fine datum positioning elements and are used to position the fine datum holes formed after the first process.

[0060] Furthermore, in this embodiment, the second contouring base 9 is provided with a Z-direction positioning boss 16. The height of the positioning boss 16 is consistent with the height difference of the aluminum profile 6 after it has been processed from the first contouring base 1, and is used to support the stepped surface formed on the aluminum profile 6 after processing by the first contouring base 1.

[0061] In addition, this embodiment also provides an application method based on the CNC tooling for precise positioning of aluminum profiles, including the following steps:

[0062] Step S1, First clamping and machining:

[0063] Step S11: Place the aluminum profile 6 to be processed into the contouring seat 1 of the first station, so that its outer contour is embedded in the contouring groove.

[0064] Align the pre-drilled coarse reference hole on the aluminum profile 6 with the cylindrical pin 4, cylindrical pin 8 and chamfered pin 2, which serve as positioning elements for the coarse reference hole, and fit them in to complete the initial positioning using the coarse reference hole.

[0065] Step S12: Drive clamping block 1 3, clamping block 2 5, and clamping block 3 7 from the inner side of aluminum profile 6 through oil pipe joint 19 to lift and press them tightly, so that the outer contour plane of aluminum profile 6 is tightly attached to the inner wall of the contour groove of contour seat 1.

[0066] Step S13: Using a four-axis CNC machine tool, through four-axis rotation, and utilizing the pre-positioned rough reference hole, complete two key machining operations in a single setup:

[0067] 1) The machining of the precision reference holes and other important features required for the subsequent processes (the second process) is achieved by completing the reference holes and important machining contents in the same clamping, ensuring the high-precision relative positional relationship between them.

[0068] 2) The two mutually perpendicular surfaces on the aluminum profile 6 are machined sequentially by four-axis rotation. This machining sequence is achieved through the special structural design of the contour mount 1, which keeps the two machined surfaces open and free from interference, thus allowing the entire machining of the two surfaces to be completed in one clamping, producing the first stepped surface 6-1 and other features.

[0069] In this process, the rough reference hole is used only as a positioning reference for this process. The material area where it is located will be removed as a machining allowance in subsequent processes, which will not affect the conformity of the final product.

[0070] In this embodiment, the pressing direction of clamping block 1 3, clamping block 2 5, and clamping block 3 7 is the same as the pressing direction of clamping block 4 11, clamping block 5 12, and clamping block 6 15 in step S2. They all press outward from the inner side of the aluminum profile 6 so that the outer plane of the aluminum profile 6 fits against the groove sidewall of the contour seat.

[0071] Step S2, Second clamping and machining:

[0072] Step S21: The aluminum profile 6 processed in step S1 is placed in the contouring seat 9 as a semi-finished product, so that its outer contour is embedded in its contouring groove.

[0073] Step S22: Align the precision reference hole machined in step S1 on the aluminum profile 6 with the cylindrical pin 3 10, cylindrical pin 4 14 and chamfered pin 2 13, which serve as positioning elements for the precision reference hole, and fit them in to complete the initial positioning using the precision reference hole.

[0074] At the same time, the first step surface 6-1 formed in step S1 is made to fit against the Z-direction positioning boss 16 set on the second profile seat 9 to complete the secondary positioning; the Z-direction positioning boss 16 is used to support the step surface 6-1, and together with the positioning of the precision reference hole, they restrict the displacement space of the aluminum profile 6 in the second processing.

[0075] Step S23: Drive clamping blocks 4 11, 5 12, and 6 15 from the inner side of the aluminum profile 6 through the oil pipe joint 19 to lift and press them tightly, so that the outer contour plane of the aluminum profile 6 is closely attached to the inner wall of the contour groove of the contour seat 2 9, and the final clamping is completed.

[0076] Step S24: Using a four-axis CNC machine tool, the second step surface 6-2 of the aluminum profile 6 is machined on the contour base 9 via four-axis rotation. In this machining process, the material area including the coarse reference hole is removed (i.e., the coarse reference hole is removed). By using the new fine reference hole and step surface for positioning, the temporary coarse reference feature used only for positioning in the first process is precisely removed, thus completing the transition from process reference to the final state of the product.

[0077] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A CNC fixture for precise positioning of aluminum profiles, characterized in that, The tooling base plate (18) is provided with positioning pins (17) for connecting to a machine tool and oil pipe joints (19) for connecting to hydraulic pressure. The tooling base plate (18) is characterized by further including workstations for at least two processes installed on the tooling base plate (18). The workstation includes a contouring seat, on which a contouring groove with one side open is provided. At least three sets of clamping blocks are provided in the contouring groove. The space formed by the three sets of clamping blocks and the contouring groove is used to accommodate the outer contour of the aluminum profile (6) to be processed. At least two surfaces of the aluminum profile (6) to be processed are open on the contouring seat for processing. The three sets of clamping blocks are connected to an oil pipe connector (19). The three sets of clamping blocks are driven by the oil pipe connector (19) to press the aluminum profile from the side. The contoured groove is also provided with a positioning pin, which corresponds to the positioning hole reserved on the aluminum profile (6) and is used to position the aluminum profile (6) to be processed.

2. The CNC tooling for precise positioning of aluminum profiles according to claim 2, characterized in that, The positioning pins include cylindrical pin one (4), cylindrical pin two (8) and chamfered pin one (2) for coarse datum positioning, and cylindrical pin three (10), cylindrical pin four (14) and chamfered pin two (13) for fine datum positioning. Among them, cylindrical pin one (4) and cylindrical pin two (8) constitute coarse reference positioning elements, which are used to position the coarse reference hole reserved on the aluminum profile (6) to be processed; cylindrical pin three (10) and cylindrical pin four (14) constitute fine reference positioning elements, which are used to position the fine reference hole formed after the first process.

3. The CNC tooling for precise positioning of aluminum profiles according to claim 1, characterized in that, The workstation includes a first (1) and a second (9) contouring base arranged side by side. The contouring seat (1) has a contouring groove, and the contouring groove is provided with clamping block 1 (3), clamping block 2 (5) and clamping block 3 (7). The space formed by the clamping block 1 (3), clamping block 2 (5) and clamping block 3 (7) and the contouring groove is used to accommodate the outer contour of the L-shaped aluminum profile (6) to be processed. The clamping blocks 1 (3), 2 (5) and 3 (7) are located on the inner side of the aluminum profile (6). The clamping blocks 1 (3), 2 (5) and 3 (7) are connected to the driving ends of three oil pipe joints (19). The clamping blocks 1 (3), 2 (5) and 3 (7) are driven by the oil pipe joints (19) to lift and press the aluminum profile (6) from the inner side, so that the outer contour plane of the aluminum profile (6) fits the corresponding inner wall of the contour groove.

4. The contouring seat 2 (9) is provided with a contouring groove, and the contouring groove is provided with clamping block 4 (11), clamping block 5 (12) and clamping block 6 (15). The space formed by the clamping block 4 (11), clamping block 5 (12) and clamping block 6 (15) and the contouring groove is used to accommodate the outer contour of the aluminum profile (6) processed from the contouring seat 1 (1); The clamping blocks four (11), five (12) and six (15) are located on the inner side of the aluminum profile (6). The clamping blocks four (11), five (12) and six (15) are connected to the driving ends of three other oil pipe joints (19). The clamping blocks four (11), five (12) and six (15) are driven by the oil pipe joints (19) to lift and press the aluminum profile (6) from the side, so that the outer contour plane of the aluminum profile (6) fits the corresponding inner wall of the contour groove.

5. The CNC fixture for precise positioning of aluminum profiles according to claim 1, characterized in that, The second contouring seat (9) is provided with a Z-direction positioning boss (16). The height of the positioning boss (16) is consistent with the height difference of the aluminum profile (6) after processing from the first contouring seat (1). It is used to support the stepped surface formed on the aluminum profile (6) after processing by the first contouring seat (1).

6. A method for applying the CNC tooling for precise positioning of aluminum profile shapes according to any one of claims 1-4, characterized in that, Includes the following steps: Step S1, First clamping and machining: Step S11: Place the aluminum profile (6) to be processed into the contouring seat (1) of the first station, so that its outer contour is embedded into the contouring groove. Align the pre-drilled coarse reference hole on the aluminum profile (6) with the coarse reference positioning elements: cylindrical pin 1 (4), cylindrical pin 2 (8) and chamfered pin 1 (2) and fit them in to complete the positioning using the coarse reference hole; Step S12: Drive clamping block one (3), clamping block two (5), and clamping block three (7) from the inner side of the aluminum profile (6) through the oil pipe joint (19) to lift and press, so that the outer contour plane of the aluminum profile (6) is tightly attached to the inner wall of the contour groove of the contour seat one (1). Step S13: Using a four-axis CNC machine tool, the first step surface (6-1) of the aluminum profile (6) is machined on the contour base (1) by rotating the four axes. Step S2, Second clamping and machining: Step S21: The aluminum profile (6) processed in step S1 is placed in the second contouring seat (9) as a semi-finished product, so that its outer contour is embedded in its contouring groove. Step S22: Align the precision reference hole machined in step S1 on the aluminum profile (6) with the cylindrical pin three (10), cylindrical pin four (14) and chamfered pin two (13) in the contour groove and fit them in to complete the initial positioning; At the same time, the first step surface (6-1) formed in step S1 is made to fit against the Z-direction positioning boss (16) set on the second contour seat (9) to complete the secondary positioning; Step S23: Drive clamping block four (11), clamping block five (12), and clamping block six (15) from the inner side of the aluminum profile (6) through the oil pipe joint (19) to press and tighten, so that the outer contour plane of the aluminum profile (6) is tightly attached to the inner wall of the contour groove of the contour seat two (9), and the final clamping is completed. Step S24: Using a four-axis CNC machine tool, the second step surface (6-2) of the aluminum profile (6) is machined on the contour base (9) by rotating the four axes.

7. The application method of the CNC tooling for precise positioning of aluminum profiles according to claim 5, characterized in that, In step S1, the pressing direction of clamping block one (3), clamping block two (5), and clamping block three (7) is the same as the pressing direction of clamping block four (11), clamping block five (12), and clamping block six (15) in step S2. They all press outward from the inner side of the aluminum profile (6) so that the outer plane of the aluminum profile (6) fits against the groove sidewall of the contour seat.

8. The application method of the CNC tooling for precise positioning of aluminum profiles according to claim 5, characterized in that, In step S2, the support of the Z-direction positioning boss (16) on the stepped surface (6-1) is combined with the positioning of the precision reference hole to jointly restrict the displacement space of the aluminum profile (6) in the second processing.

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