A manufacturing process for a mounting base

Abstract

The present application belongs to the technical field of mounting seat processing, and particularly relates to a manufacturing process of mounting seat, comprising the following steps: preparing a die forging part; first milling, processing a threaded hole and a half-elliptical hole; turning, loading into a turning tooling, and processing a connecting shaft; second milling, loading into a milling tooling, and processing all elliptical limiting holes and a circular hole on the connecting shaft; and completing a wire hole and an inclined step hole through drilling. The present application uses a three-axis machining center and a common numerical control lathe to complete a product that can only be completed by using a five-axis machining center. However, after using these devices, the mounting seat cannot complete the entire machining process in one clamping, so a turning tooling is designed, the position of the elliptical hole is utilized, but the elliptical hole cannot fix the part, the position of the elliptical hole is first processed into a threaded hole smaller than the elliptical hole, the reverse surface of the mounting seat can be processed by using the turning tooling, and then the threaded hole is processed into the elliptical hole by using the milling tooling, thereby reducing the dependence on high-end equipment and reducing the processing cost.

Description

Technical Field

[0001] This invention belongs to the field of mounting base processing technology, and specifically relates to a manufacturing process for a mounting base. Background Technology

[0002] With the development of the aviation industry, the requirements for components such as mounting bases are quite stringent, including their precision and surface roughness, in addition to their complex structures, such as... Figure 1 a and Figure 1 As shown in Figure b, the main components include a positioning base 01, a connecting shaft 02, a protruding seat 03, and a trapezoidal seat 04. The connecting shaft 02 is located on the back of the positioning base 01, while the protruding seat 03 and trapezoidal seat 04 are located on the front of the positioning base 01. Elliptical limiting holes 011 are machined on the positioning base 01 and the clearance surface of the protruding seat 03. Two circular holes 021 are machined on the end face of the connecting shaft 02. A groove 022 is machined at the junction of the connecting shaft 02 and the positioning base 01. Inclined stepped holes 031 are machined on the two vertical inclined surfaces 032 of the protruding seat 03. A threading hole 041 is machined on the trapezoidal seat 04. There are also some stepped, arc-shaped, and other structures, making machining difficult. Currently, the common machining method for such parts is five-axis machining center processing. However, five-axis machining centers are expensive, and some manufacturers do not have them, requiring them to outsource machining to other manufacturers, significantly increasing production costs.

[0003] Therefore, a new processing technology is urgently needed. Summary of the Invention

[0004] The purpose of this invention is to provide a manufacturing process for a mounting base that solves the problem of high costs caused by the reliance on high-end equipment such as five-axis machining centers for processing.

[0005] This invention is achieved through the following technical solution:

[0006] This invention discloses a manufacturing process for a mounting base, specifically including the following steps:

[0007] S1. Prepare the forging: The forging is the basic structure of the mounting base, including the positioning base, connecting shaft, protruding seat and trapezoidal seat;

[0008] S2. First milling: Use a three-axis machining center to machine the front side of the positioning base, machine three threaded holes on the positioning base, and machine a half-elliptical hole on the protrusion to obtain structure one;

[0009] S3, Machining: Install Structure 1 in the designed machining fixture, fix the machining fixture to Structure 1, clamp it on the lathe, and machine the connecting shaft in Structure 1 to obtain Structure 2.

[0010] S4, Second milling operation:

[0011] Structure 2 is installed in the designed milling fixture. The milling fixture is fixed to Structure 2 using a pressure plate and clamped onto a three-axis machining center. Two round holes are machined on the connecting shaft. The three threaded holes on the positioning base are machined into elliptical limiting holes. At the same time, a fourth elliptical limiting hole is machined on the protrusion seat and connected to the half-elliptical hole machined in the first step in S2 to obtain Structure 3.

[0012] S5. Drilling: Fix structure three onto the drilling machine, machine the threading hole on the trapezoidal seat, and machine the inclined step hole on the protruding seat. At this point, the mounting seat is completed.

[0013] Furthermore, in S3, the machining tool is a cylinder, and a special-shaped groove matching the shape of the mounting base is machined inside the cylinder. The special-shaped groove is provided with a first limiting post, a second limiting post, and a third limiting post. The first limiting post, the second limiting post, and the third limiting post are pre-made with three screw holes to correspond to the three threaded holes on the positioning base surface of the mounting base.

[0014] Furthermore, in S3, structure one is installed in the designed machining fixture, specifically as follows:

[0015] Structure 1 is placed into the irregular groove of the lathe tooling, and the three threaded holes are fixedly connected to the three screw holes with screws. It is then clamped onto the lathe to machine the connecting shaft. A stepped surface is machined on the connecting shaft, and a groove is machined at the connection between the connecting shaft and the positioning base. The back of the forging is machined to the designed thickness to obtain Structure 2.

[0016] Furthermore, the heights of the first, second, and third limiting posts match the height of the protruding seat, and the diameters of the three screw holes are the same as the diameters of the three threaded holes on the positioning base surface.

[0017] Furthermore, in S4, the designed milling fixture is a cylinder, and a special-shaped groove matching the shape of the part is machined inside the cylinder. The special-shaped groove is provided with a limiting post A, a limiting post B and a limiting post C. Three screw holes are pre-made on the limiting post A, the limiting post B and the limiting post C.

[0018] A screw hole is machined on the end face of the cylinder with an irregular groove;

[0019] Connecting screw holes are machined on the pressure plate.

[0020] Furthermore, in S4, structure two is installed in the designed milling fixture, and the milling fixture is fixed to structure two using a pressure plate, specifically as follows:

[0021] After placing Structure 2 into the irregular groove, make the screw holes on Limiting Post A, Limiting Post B and Limiting Post C correspond to the three threaded holes on the positioning base surface of Structure 2.

[0022] Place the pressure plate on the irregular groove and fix the screw hole to the connecting screw hole on the pressure plate with screws.

[0023] Furthermore, an alignment plane is machined on the outer cylindrical surface of the cylinder, which is the plane used for alignment when clamped on the machine tool.

[0024] Furthermore, both the turning tool and the milling tool have a cylindrical shape, and the cylinders have the same diameter.

[0025] Compared with the prior art, the present invention has the following beneficial technical effects:

[0026] This invention discloses a manufacturing process for a mounting base. It uses a three-axis machining center and a conventional CNC lathe to complete a product that would otherwise require a five-axis machining center. However, with these machines, the entire machining process cannot be completed in a single clamping operation. First, the front side is machined on the three-axis machining center, but this makes it impossible to clamp and fix the front side. Therefore, a lathe fixture is designed to utilize the elliptical hole position. However, the elliptical hole cannot fix the part. Therefore, a process method is designed to first machine the elliptical hole position into a threaded hole smaller than the elliptical hole. In this way, the back side of the mounting base can be machined using the lathe fixture, and then the threaded hole is machined into the elliptical hole using a milling fixture. This reduces the dependence on high-end equipment and lowers the processing cost.

[0027] Because of the complex structure of this mounting base, it is difficult to process directly and is prone to deformation. This invention uses a designed tooling for clamping, which not only ensures the machining accuracy of the parts, but also avoids the use of high-end equipment, thereby greatly reducing the machining cost.

[0028] Furthermore, the present invention designs an auxiliary machining fixture. The machining fixture is cylindrical for easy clamping. The irregular groove inside the cylinder is designed to match the shape of the part. Three limiting posts are designed inside the cylinder to fully limit the X, Y and Z directions of the two parts.

[0029] Furthermore, the present invention designs an auxiliary milling fixture. The milling fixture is cylindrical for easy clamping. The irregular groove inside the cylinder is designed to match the shape of the part. Three limiting posts are also designed inside the cylinder to fully limit the X, Y, and Z directions of the two parts.

[0030] Unlike turning, milling cannot hold the original three threaded holes, so a pressure plate is added. The pressure plate is fixedly connected to the end face of the cylinder to limit the machining of the part.

[0031] Furthermore, both the lathe tooling and the milling tooling have cylindrical shapes with the same diameter, allowing the same blank to be used when manufacturing the two toolings, which facilitates design and processing and saves costs. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of a model of the mounting bracket for the aircraft engine;

[0033] Among them, 01 is the positioning base surface; 02 is the connecting shaft; 03 is the protruding seat; and 04 is the trapezoidal seat.

[0034] 011, Elliptical limiting hole; 021, Round hole; 022, Groove; 031, Sloping step hole; 032, Bevel; 041, Threading hole;

[0035] Figure 2 This is a schematic diagram of the mounting base before machining.

[0036] Among them, 05, forgings;

[0037] Figure 3 This is a structural diagram of a lathe tooling;

[0038] Among them, 11, first limiting post; 12, second limiting post; 13, third limiting post; 14, screw hole;

[0039] Figure 4 This is a structural schematic diagram of a milling machine tooling;

[0040] Among them, 21. Alignment plane; 22. A limiting post; 23. B limiting post; 24. C limiting post; 25. Screw hole;

[0041] Figure 5 Assembly drawings are prepared for the machining process of the mounting base;

[0042] Among them, 1. Machining fixtures;

[0043] Figure 6 The assembly drawing is machined for the milling process of the mounting base;

[0044] Among them, 2. Milling fixture; 3. Screw; 4. Pressure plate;

[0045] Figure 7 This is the part drawing obtained after the first milling operation;

[0046] Among them, 011a is a threaded hole; 011b is a semi-elliptical hole;

[0047] Figure 8 This is the part drawing obtained after the machining process is completed;

[0048] Figure 9 This is the part drawing obtained after the second milling operation;

[0049] Figure 10 The initial part drawing obtained by the driller;

[0050] Figure 11 This is the final part drawing obtained by the driller. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of the present invention clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention; that is, the described embodiments are only a part of the embodiments of the present invention, and not all of them.

[0052] The components described and illustrated in the accompanying drawings and embodiments of this invention can be arranged and designed in various different configurations. Therefore, the detailed description of the embodiments of the invention provided in the following drawings is not intended to limit the scope of the claimed invention, but merely to illustrate one selected embodiment of the invention. All other embodiments obtained by those skilled in the art based on the accompanying drawings and embodiments of this invention without inventive effort are within the scope of protection of this invention.

[0053] It should be noted that the terms “comprising,” “including,” or any other variations are intended to cover non-exclusive inclusion, such that a process, element, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to the process, element, method, article, or apparatus.

[0054] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0055] This invention discloses a manufacturing process for a mounting base, which uses a three-axis machining center to produce a product that would otherwise require five axes of machining. This reduces reliance on high-end equipment and lowers processing costs. The process specifically includes the following steps:

[0056] S1. Prepare materials: (See attached...) Figure 2 The forging shown is 05;

[0057] S2. First milling operation: The front of the part is machined using a three-axis machining center. Three threaded holes 011a are first machined on the positioning datum 01. The elliptical hole on the protrusion 03 is not machined as a through hole; only half of the elliptical hole 011b is machined, resulting in the following: Figure 7 The structure shown;

[0058] Only half of the hole is machined here. Because the thickness of the protrusion seat 03 is relatively large, it needs to be machined in two separate steps, front and back.

[0059] S3, Lathe operator: using Figure 3 The designed lathe fixture 1 limits the position of the part, and then uses screws to fix the fixture to the part, clamping it onto the lathe to machine the lower half of the part. The machined structure is shown in Figure 1. Figure 8 ;

[0060] like Figure 3 As shown, the machining fixture 1 is a cylinder with a shaped groove that matches the shape of the part. The shaped groove is provided with a first limiting post 11, a second limiting post 12 and a third limiting post 13. Three screw holes 14 are pre-made on the three limiting posts to correspond to the three threaded holes 011a on the positioning base surface 01 of the part.

[0061] like Figure 5 As shown, Figure 7 The machined part is placed into the irregular groove of the lathe fixture 1. Screws are used to secure the three threaded holes 011a to the three screw holes 14. The part is then clamped onto a lathe and machined to the designed thickness on the back side. A stepped surface is machined on the connecting shaft 02, and a groove 022 is machined at the connection point between the connecting shaft 02 and the positioning base surface 01, resulting in the following... Figure 8 The structure shown;

[0062] S4, Second milling operation:

[0063] use Figure 4 The designed milling fixture 2 limits the position of the part, and then screws 3 and pressure plates 4 are used to fix the milling fixture 2 to the part. It is then clamped onto a three-axis machining center and machined according to the drawing requirements. The final structure is shown in the figure. Figure 9 The details are as follows:

[0064] like Figure 4 As shown, the designed milling fixture 2 is also a cylinder. A special-shaped groove matching the shape of the part is machined inside the cylinder. A limiting post 22, a limiting post 23 and a limiting post 24 are provided in the special-shaped groove. Three screw holes are pre-made on the three limiting posts.

[0065] The difference from the lathe tooling structure is that an alignment plane is machined on the outer cylindrical surface of the cylinder, which is the plane for alignment when clamped on the machine tool; three screw holes 25 are machined on the end face of the cylinder with irregular grooves, and three screw holes are correspondingly machined on the pressure plate, and the three screw holes 25 are matched and connected with the three screw holes on the pressure plate 4.

[0066] like Figure 6 As shown, the milling fixture 2 is fixed to the part using screws 3 and pressure plates 4. Two round holes 021 are machined on the connecting shaft 02 to... Figure 8 The three threaded holes 011a are machined into elliptical limiting holes 011, and at the same time, a fourth elliptical limiting hole is drilled on the back side of the positioning base surface 01, connecting with... Figure 7 The first processed half-elliptical hole 011b is connected, and the resulting structure is as follows. Figure 9 As shown.

[0067] S5, Driller: such as Figure 10 As shown, Figure 9The obtained part is fixed onto a drilling machine, and a wire threading hole 041 is machined.

[0068] S6, Driller: such as Figure 11 As shown, Figure 10 The part shown is fixed on a drilling machine, and the inclined stepped hole 031 is machined, thus completing the machining.

[0069] Finally, each item is individually sealed with bubble wrap and shipped out.

[0070] Even if the structure of the mounting base changes, the method of this invention is still applicable; only the corresponding tooling needs to be adapted and modified.

[0071] The machining process for mounting bases used in this aerospace industry is as follows: a product that could only be completed using a five-axis machining center was made using a three-axis machining center and a regular CNC lathe. However, with these machines, the entire machining process cannot be completed in a single clamping. First, the front side is completed on the three-axis machining center, but then the back side cannot be clamped and fixed. Therefore, a fixture was designed to utilize the location of the elliptical hole. However, the elliptical hole cannot fix the part, so a process method was designed to machine the location of the elliptical hole into a threaded hole smaller than the elliptical hole. In this way, the back side can be machined using the fixture, and then the elliptical hole is machined using the fixture. This reduces the dependence on high-end equipment and lowers the machining cost.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A manufacturing process for a mounting base, characterized in that, Specifically, the following steps are included: S1. Prepare the forging (05): The forging (05) is the basic structure of the mounting base, including the positioning base (01), the connecting shaft (02), the protruding seat (03) and the trapezoidal seat (04); the protruding seat (03) is located on one side of the trapezoidal seat (04); S2, First milling: Use a three-axis machining center to machine the front of the positioning base (01), machine three threaded holes (011a) on the positioning base (01), and machine a half-elliptical hole (011b) on the protrusion (03) to obtain structure one; S3, Machining: Install Structure 1 in the designed machining fixture (1), fix the machining fixture (1) to Structure 1, clamp it on the lathe, and machine the connecting shaft (02) in Structure 1 to obtain Structure 2; S4, Second milling operation: Structure 2 is installed in the designed milling fixture (2), and the milling fixture (2) is fixed with Structure 2 using the pressure plate (4). It is clamped onto the three-axis machining center. Two round holes (021) are machined on the connecting shaft (02). The three threaded holes (011a) on the positioning base surface (01) are machined into elliptical limiting holes (011). At the same time, a fourth elliptical limiting hole (011) is machined on the protrusion seat (03). It is connected to the half-elliptical hole (011b) machined in the first step in S2 to obtain Structure 3. S5. Drilling: Fix the structure three onto the drilling machine, machine the wire threading hole (041) on the trapezoidal seat (04), and machine the inclined step hole (031) on the protruding seat (03). At this point, the mounting seat is completed. In S3, the machining tool (1) is a cylinder, and a special-shaped groove matching the shape of the mounting seat is machined in the cylinder. The special-shaped groove is provided with a first limiting post (11), a second limiting post (12) and a third limiting post (13). The first limiting post (11), the second limiting post (12) and the third limiting post (13) are respectively pre-made with three screw holes (14) to correspond to the three threaded holes (011a) on the positioning base surface (01) of the mounting seat. In S3, structure one is installed in the designed machining fixture (1), specifically as follows: Structure 1 is placed in the irregular groove of the lathe tool (1), and the three threaded holes (011a) are fixedly connected to the three screw holes (14) with screws. It is then clamped onto the lathe to process the connecting shaft (02). A stepped surface is machined on the connecting shaft (02), and a groove (022) is machined at the connection between the connecting shaft (02) and the positioning base surface (01). The back of the forging part (05) is machined to the designed thickness to obtain Structure 2. In S4, the milling fixture (2) designed is a cylinder. A special groove matching the shape of the part is machined in the cylinder. A limiting post (22), a limiting post (23) and a limiting post (24) are provided in the special groove. Three screw holes are pre-made on the limiting post (22), the limiting post (23) and the limiting post (24). A screw hole (25) is machined on the end face of the cylinder with a special groove. Connecting screw holes are machined on the pressure plate (4).

2. The manufacturing process of the mounting base according to claim 1, characterized in that, The heights of the first limiting post (11), the second limiting post (12) and the third limiting post (13) match the height of the protrusion seat (03), and the three screw holes (14) have the same diameter as the three threaded holes (011a) on the positioning base surface (01).

3. The manufacturing process of the mounting base according to claim 1, characterized in that, In S4, structure two is installed in the designed milling fixture (2), and the milling fixture (2) is fixed to structure two using the pressure plate (4), specifically as follows: Place structure two into the irregular groove so that the screw holes on the A limiting post (22), B limiting post (23) and C limiting post (24) correspond to the three threaded holes (011a) on the positioning base surface (01) on structure two; Place the pressure plate (4) on the irregular groove and fix the screw hole (25) to the connecting screw hole on the pressure plate (4) with the screw (3).

4. The manufacturing process of a mounting base according to claim 1, characterized in that, A aligning plane (21) is machined on the outer cylindrical surface of the milling fixture (2). The aligning plane (21) is the plane for alignment when clamped on the machine tool.

5. The manufacturing process of a mounting base according to claim 1, characterized in that, The cylinder diameters of the lathe tooling (1) and the milling tooling (2) are the same.

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