Machining method of a launch tube

Abstract

The present invention discloses a machining method for a launch tube, wherein the launch tube consists of a tube body, a foot support and a suspension, the tube body is made of composite material, a plurality of coarse ring ribs are uniformly formed on the outer wall of the tube body along its axial direction, the four foot supports are arranged in pairs and are located on two coarse ring ribs, the two suspensions are respectively located on the two coarse ring ribs, the foot supports and the suspensions are symmetrical along the axial direction of the tube body; the machining method includes and is performed in sequence according to the following steps: fixing, aligning, machining the foot support base surface, machining the suspension base surface, installing the foot support, installing the suspension and calibrating. This invention changes the traditional method of machining the basic structure directly on the launch tube, and performs as little milling as possible on the tube body of the launch tube, thereby avoiding the problem of machining difficulties caused by the inability to use cutting fluid and easy damage to the tool and workpiece. The split installation of the basic structure also facilitates molding and subsequent separate finishing, thereby improving efficiency.

Description

Technical Field

[0001] The present invention relates to the field of machining technology, in particular to a machining method for a launch tube. Background Art

[0002] The missile launch tube (hereinafter referred to as the launch tube) consists of three parts: the tube body, the foot supports, and the suspension. The tube body is made of composite materials. Multiple thick ring ribs are uniformly formed on the outer wall of the tube body along its axis. Two of these thick ring ribs have four foot supports for securing the launch tube. These two thick ring ribs also have four suspensions for hoisting the launch tube. The foot supports and the suspension are symmetrical along the axis of the tube body, and the bottom surface of the foot supports and the top surface of the suspension must be parallel to within 0.2 mm to ensure the reliability and stability of the launch tube during use.

[0003] The main difficulties encountered in the machining process of the launch tube are:

[0004] First, the shape of the launch tube is usually a relatively regular cylindrical shape. Generally, functional structures (such as fixing and lifting structures) are directly machined on the tube body. However, due to the material limitations of the launch tube, machining is difficult. Specifically, since the tube body is made of composite materials, composite materials cannot be machined (milled) with cutting fluid. The lack of cooling and lubrication by cutting fluid not only increases the machining difficulty but also causes great damage to the tool and workpiece during the machining process of the material. Therefore, it is crucial to minimize milling while ensuring that the launch tube has basic installation structures such as fixing and lifting.

[0005] Second, because the part itself is relatively long, it is difficult to ensure the parallelism between the central axis of the launch tube and the suspension and foot support during machining, resulting in low product quality, slow processing progress, and low efficiency.

[0006] Third, the positions of the suspension and foot supports are quite different. In the process of changing the processing position of the launch tube back and forth, how to ensure the parallelism within 0.2mm. Summary of the Invention

[0007] The purpose of the present invention is to provide a machining method for a launch tube to solve the problems of less milling, high parallelism accuracy of the basic mounting structure and high efficiency during the machining of the basic mounting structure of the launch tube machine.

[0008] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0009] A method for machining a launch tube, comprising a tube body, a foot support, and a suspension, wherein the tube body is made of composite material, a plurality of coarse ring ribs are uniformly formed on the outer wall of the tube body along its axis, four foot supports are arranged in pairs and located on two coarse ring ribs, two suspension ribs are located on two coarse ring ribs, and the foot supports and the suspension ribs are symmetrical along the axis of the tube body; the machining method comprises and is performed in the following steps in sequence:

[0010] S1. Fixing: The barrel is mounted on the workbench of the machining center using multiple V-shaped fixtures. Two symmetrical long bolts on the V-shaped fixtures press against the thick ring ribs. Ratchet-type binding belts pass through the rings on both sides of the V-shaped fixtures to fix the barrel;

[0011] S2. Alignment: Align the central axis of the large holes at both ends of the barrel, and align the tops of each thick ring rib, with the straightness error within 0.1mm;

[0012] S3. Processing the foot support base surface: With the central axis as the center, 12 Φ12 holes are evenly distributed along the ring on the two end surfaces of the cylinder body, the foot support base surface is milled on the coarse ring rib and the bottom window is milled on the cylinder body, and holes are drilled on the foot support base surface and around the bottom window;

[0013] S4. Processing the hanging base surface: Rotate the barrel 180° on the V-shaped fixture with the base surface of the foot support facing downwards, align the central axis of the large holes at both ends of the barrel, use Φ12 holes for auxiliary positioning, mill out the hanging base surface on the coarse ring rib and the top window on the barrel, and drill holes on the hanging base surface and around the top window;

[0014] S5. Install the foot supports: Rotate the barrel 180° on the V-shaped fixture with the foot support base facing upwards. Install the four foot supports on the four foot support bases and pre-tighten them with bolts, leaving at least 1mm margin on the bottom surface of the foot supports. After aligning the bottom surfaces of the four foot supports, tighten the bolts. Using the centerline of the launch tube as a reference, machine the bottom surfaces of the foot supports to the required dimensions.

[0015] S6. Install the hangers: Turn the barrel 180° on the V-shaped fixture with the hanger base facing upwards. Install the two hangers on the two hanger bases and pre-tighten them with bolts, leaving at least 1mm margin on the top surface of the hangers. After aligning the top surfaces of the two hangers, tighten the bolts. Using the centerline of the launch tube as a reference, machine the top surfaces of the hangers to size.

[0016] S7. Verification: If the straightness error of the foot support and the suspension is within 0.2mm, the product is qualified and will be wrapped and put into storage.

[0017] A further technical solution is: in S2, the top of the thick ring rib is straightened and the position of the barrel is adjusted by a long bolt.

[0018] A further technical solution is: the annular groove on the foot support cooperates with the thick annular reinforcement, and the annular groove on the suspension cooperates with the thick annular reinforcement.

[0019] A further technical solution is: the tool speed of the machining center in S4~S6 is 800~1200r / min, and the feed rate is 1200~1400mm / min.

[0020] A further technical solution is: in S1, after the barrel is fixed by ratchet binding, the top height of each thick ring rib is measured, and the height error is within 0.1mm.

[0021] A further technical solution is: the Φ12 hole in S4 assists in positioning, and two Φ12 holes with the same diameter as the large hole on the end face of the barrel are selected.

[0022] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0023] 1. The machining method of the launch tube provided by the present invention changes the traditional method of machining the basic structure directly on the launch tube. Minimum milling is performed on the barrel of the launch tube. Only the mounting base surface needs to be machined on the coarse ring rib of the barrel, and the separately molded and finely machined foot supports and hangers are assembled on the corresponding base surfaces. Compared with the previous machining method of the launch tube, the multi-faceted machining of the basic structure is changed to single-sided machining on the barrel, which greatly reduces the number of machining steps and avoids the problems of machining difficulties caused by the inability to use cutting fluids and easy damage to tools and workpieces. Moreover, the split installation of the basic structure also facilitates molding and subsequent separate fine machining, thereby improving efficiency.

[0024] 2. The present invention also utilizes a V-shaped fixture to facilitate the installation of the barrel on a CNC machining center and facilitate the change and fixation of the processing position. The V-shaped fixture simultaneously matches the central axis of the large holes at both ends of the barrel itself and the Φ12 holes on the two end surfaces, facilitating alignment, ensuring the accuracy of barrel installation and processing, and ensuring that the straightness error of the foot support and suspension on the leg barrel does not exceed 0.2mm, avoiding the negative impact of large straightness errors of the base surface, foot support and suspension caused by the long barrel length and the large difference in base surface position on the launch tube machining. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a structural schematic diagram of a machining method for a launch tube according to the present invention.

[0026] Figure 2 For the present invention Figure 1 Schematic diagram of the structure from a positive perspective.

[0027] Figure 3 For the present invention Figure 1 Schematic diagram of the structure from a side perspective.

[0028] Figure 4 For the present invention Figure 1 Schematic diagram of the structure from a top-down perspective.

[0029] Figure 5 For the present invention Figure 1 Schematic diagram of the structure from an upward perspective.

[0030] Figure numerals: 1. barrel; 2. foot support; 3. hanging; 4. thick ring rib; 5. V-shaped tooling; 6. bottom window; 7. top window; 8. Φ12 hole. DETAILED DESCRIPTION

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0033] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other.

[0034] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0035] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is typically placed when in use, or are the orientations or positional relationships commonly understood by those skilled in the art. These terms are intended only to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0036] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0037] Example 1:

[0038] This embodiment Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 As shown, a machining method of a launch tube, the launch tube consists of a tube body 1, a foot support 2 and a hanger 3, the tube body 1 is made of composite material, and due to its material problem, cutting fluid cannot be used during the machining (milling) process, a plurality of coarse ring ribs 4 are uniformly formed on the outer wall of the tube body 1 along its axial direction, four foot supports 2 are arranged in pairs and are located on two coarse ring ribs 4 (in traditional machining technology, the foot supports 2 are directly milled on the tube body 1 or the coarse ring ribs 4), the foot supports 2 are used to install the launch tube, and the two hangers 3 are respectively located on the two coarse ring ribs 4 (in traditional machining technology, the hangers 3 are directly milled on the tube body 1 or the coarse ring ribs 4), the hanger 3 is used to lift the launch tube, and the foot support 2 and the hanger 3 are symmetrical along the axial direction of the tube body 1;

[0039] The machining method of the launch tube of the present invention includes and is performed in the following order: the barrel 1 itself is a workpiece with high precision, and its mounting structure is mainly machined and formed:

[0040] S1. Fixing: The barrel 1 is mounted on the workbench of the machining center using multiple V-shaped fixtures 5. The thick ring ribs 4 on the barrel 1 are just clamped on the supporting arms of the V-shaped fixtures 5. The bottom surface of the V-shaped fixtures 5 is adapted to the workbench of the machining center, eliminating the need for adjustment. Two symmetrical long bolts on the V-shaped fixtures 5 press against the thick ring ribs 4. Ratchet-type binding belts pass through the rings on both sides of the V-shaped fixtures 5 to fix the barrel 1.

[0041] S2. Alignment: According to the traditional alignment (centering) method, align the central axis of the large holes at both ends of the barrel 1 and the top of each thick ring rib 4. The straightness error is within 0.1mm. If necessary, the position of the barrel 1 can be adjusted by the V-shaped tooling 5.

[0042] S3. Processing the foot support base surface: According to the process requirements of the drawing, with the central axis as the center, 12 Φ12 holes 8 are evenly distributed along the ring on the two end surfaces of the cylinder body 1, the foot support base surfaces are milled on the two coarse ring ribs 4, the bottom window 6 is milled on the cylinder body 1, and holes are drilled on the foot support base surfaces and around the bottom window 6;

[0043] S4. Processing the hanging base surface: Rotate the barrel 1 180° on the V-shaped fixture 5 with the foot support base facing downward, align the central axis of the large holes at both ends of the barrel 1, and use the Φ12 holes 8 for auxiliary positioning (select two Φ12 holes 8 on the end surface of the barrel 1 with the same diameter), mill out the hanging base surface on the coarse ring rib 4 and the top window 7 on the barrel 1, and drill holes on the hanging base surface and around the top window 7;

[0044] S5. Install the foot supports: Rotate the barrel 1 180° on the V-shaped fixture 5 with the base of the foot supports 2 facing upward. Install the four foot supports 2 on the four bases and pre-tighten them with bolts, leaving at least 1mm margin on the bottom of the foot supports 2. Align the bottom surfaces of the four foot supports 2 and tighten the bolts. Using the central axis of the launch tube as a reference, machine the bottom surfaces of the foot supports 2 to the required dimensions.

[0045] S6. Install the hangers: Turn the barrel 1 180° on the V-shaped fixture 5 with the hanger base facing upward. Install the two hangers 3 on the two hanger bases and pre-tighten them with bolts, leaving at least 1mm margin on the top surface of the hangers 3. After aligning the top surfaces of the two hangers 3, tighten the bolts. Using the center axis of the launch tube as the reference, machine the top surfaces of the hangers 3 to size.

[0046] S7. Verification: If the straightness error of the foot support 2 and the suspension 3 is within 0.2 mm, the product is qualified and is packaged and put into storage.

[0047] Preferably, in S2, the top of the thick ring rib 4 can be straightened and the position of the barrel 1 can be adjusted by a long bolt to achieve the purpose of centering (alignment).

[0048] Preferably, the annular groove on the foot support 2 cooperates with the thick annular rib 4 , and the annular groove on the hanger 3 cooperates with the thick annular rib 4 .

[0049] The cooperation between the annular groove and the thick annular rib 4 effectively avoids the axial movement of the foot support 2 and the hanger 3 on the barrel 1, and facilitates assembly.

[0050] Preferably, the tool speed of the machining center in S4 to S6 is 800 to 1200 r / min, and the feed rate is 1200 to 1400 mm / min.

[0051] Because cutting fluid cannot be used, in order to prevent the generation of high temperature and excessive cutting force, cutting experiments are conducted on samples of the same specifications of barrel 1. Reasonable control of tool speed and feed rate can prevent excessive friction heat of the tool and damage to parts caused by excessive cutting force, while ensuring the maximum milling speed.

[0052] Preferably: in S1, after the ratchet binding belt fixes the barrel 1, the top height of each thick ring rib 4 is measured, and the height error is within 0.1 mm.

[0053] It should be noted that the ratchet-type binding belt cannot cause deformation of the barrel 1, at least the deformation error should not exceed 0.1mm, otherwise it will affect the straightness of the machined base surface, and thus cause large straightness errors of the foot support 2 and the hanger 3. Because the foot support 2 and the hanger 3 are both individually machined single parts, once the error is large, it is difficult to correct it without sufficient margin, resulting in scrapping and rework of the parts.

[0054] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A machining method for a launch tube, comprising a tube body (1), a foot support (2) and a hanger (3), wherein the tube body (1) is made of a composite material, a plurality of thick ring ribs (4) are uniformly formed on the outer wall of the tube body (1) along its axial direction, four foot supports (2) are arranged in pairs and are located on two of the thick ring ribs (4), two hangers (3) are respectively located on the two thick ring ribs (4), and the foot supports (2) and the hanger (3) are symmetrical along the axial direction of the tube body (1); and the method is characterized in that: The machining method includes and is performed in the following steps in sequence: S1. Fixing: The barrel (1) is mounted on a workbench of a machining center using a plurality of V-shaped fixtures (5). Two symmetrical long bolts on the V-shaped fixtures (5) are pressed against the thick ring ribs (4). A ratchet-type binding belt is passed through the rings on both sides of the V-shaped fixtures (5) to fix the barrel (1); S2. Alignment: Align the central axis of the large holes at both ends of the barrel (1) and the top of each thick ring rib (4). The straightness error is within 0.1mm. S3. Processing the base surface of the foot support: with the central axis as the center, 12 Φ12 holes (8) are processed on the two end surfaces of the cylinder (1) in a uniformly distributed manner along the ring, the base surface of the foot support is milled on the coarse ring rib (4) and the bottom window (6) is milled on the cylinder (1), and holes are drilled on the base surface of the foot support and around the bottom window (6); S4, processing the hanging base surface: the barrel (1) is rotated 180 degrees on the V-shaped fixture (5) with the base surface of the foot support facing downwards, the central axis of the large holes at both ends of the barrel (1) is aligned, the Φ12 hole (8) is used for auxiliary positioning, the hanging base surface is milled on the coarse ring rib (4) and the top window (7) is milled on the barrel (1), and holes are drilled on the hanging base surface and around the top window (7); S5. Install the foot supports: the barrel (1) is rotated 180° on the V-shaped fixture (5) with the base of the foot supports (2) facing upwards. The four foot supports (2) are respectively installed on the four foot support bases and pre-tightened by bolts, leaving at least 1mm margin on the bottom surface of the foot supports (2). After the four bottom surfaces of the four foot supports (2) are aligned, the bolts are tightened. With the central axis of the launch tube as the reference, the bottom surface of the foot supports (2) is machined to the size; S6. Install the hanger: the barrel (1) is rotated 180° on the V-shaped fixture (5) with the hanger base facing upwards. The two hangers (3) are respectively installed on the two hanger (3) bases and pre-tightened by bolts, leaving at least 1mm margin on the top surface of the hanger (3). After the two top surfaces of the two hangers (3) are aligned, tighten the bolts. With the central axis of the launch tube as the reference, the top surface of the hanger (3) is machined to size; S7. Verification: If the straightness error of the foot support (2) and the suspension (3) is within 0.2 mm, the product is qualified and is packaged and put into storage.

2. The machining method of a launch tube according to claim 1, characterized in that: In the step S2, the top of the thick ring rib (4) is straightened, and the position of the barrel (1) is adjusted by means of a long bolt.

3. The machining method of a launch tube according to claim 1, characterized in that: The annular groove on the foot support (2) cooperates with the thick annular rib (4), and the annular groove on the hanger (3) cooperates with the thick annular rib (4).

4. The machining method of a launch tube according to claim 1, characterized in that: The tool speed of the machining center in S4 to S6 is 800 to 1200 r / min, and the feed rate is 1200 to 1400 mm / min.

5. The machining method of a launch tube according to claim 1, characterized in that: In the above-mentioned S1, after the ratchet-type binding belt fixes the barrel (1), the top height of each thick ring rib (4) is measured, and the height error is within 0.1 mm.

6. The machining method of a launch tube according to claim 1, characterized in that: The Φ12 hole (8) in S4 assists in positioning, and two Φ12 holes (8) on the same diameter of the large hole on the end face of the barrel (1) are selected.

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