Magnetic assembly positioning tool for solid engine shell enclosure

Abstract

A solid engine shell outer shell magnetic assembly positioning tool is composed of a tool shell and a magnet core which is located in the tool shell. The lower surface of the positioning tool is an arc surface matched with the surface of the solid engine shell. The circumferential two side surfaces of the positioning tool arc surface are respectively a first assembly reference surface and a second assembly reference surface, which are used for ensuring the axial dimension of the outer shell. The two side surfaces of the positioning tool in the axial direction are respectively provided with vertical positioning reference grooves. The present application reduces the marking workload and ensures the radial assembly dimension of the outer shell by assembling the special-shaped irregular outer shell through the tool. Two special-shaped irregular outer shells can be simultaneously assembled in use, thereby improving the assembly efficiency. The position of the external part on the solid engine shell is ensured through the tool, thereby improving the assembly precision, reducing the marking and inspection workload, and greatly improving the production efficiency.

Description

Technical Field

[0001] This invention relates to the field of manufacturing solid rocket motor metal casings, and specifically to a tooling for magnetic assembly and positioning of the casing outer shell. Background Technology

[0002] Solid rocket motor casings have numerous outer shells of varying shapes distributed around their outer circumference. These outer shells are typically welded to the casing. The production process for welding these outer shells is: manual marking—assembly according to the markings—tack welding—inspection—welding. For some irregularly shaped outer shells, manual assembly is inefficient and struggles to meet design dimensional requirements. Manual assembly of such irregular shells requires marking a center position line, four radial position lines, and an axial position line. Assembly requires aligning the outer shell with both radial and axial positions. While the axial position of these irregular shells is relatively easy to ensure, the radial position lines are located at the bottom, making it difficult to guarantee the radial dimensions of the outer shell during line assembly. Therefore, a positioning fixture for outer shell assembly needs to be designed to assist operators in achieving efficient assembly of irregular shells.

[0003] Assembly and positioning fixtures for general housings can be either integral or partial. The fixture disclosed in invention application number 2021115672463 is an integral assembly and positioning fixture. The advantage of this fixture is that it can complete the assembly and positioning of all housings at once. The disadvantage is that this fixture is only suitable for use on small-diameter housings. When used on large-diameter housings, it is too heavy and inconvenient to disassemble.

[0004] Chinese patent application CN107052605 A discloses a partial assembly positioning fixture capable of quickly and accurately assembling the outer shell of a large-diameter housing. This fixture is well-suited for use on large-diameter housings, but its drawback is that it assembles regular-shaped housings and is unsuitable for assembling irregularly shaped housings. When such irregularly shaped housings are distributed along the housing axis, the design of the assembly fixture must consider not only axial and radial dimensions but also ease of disassembly after the housing is tack welded. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies in assembling and positioning irregularly shaped shells, this invention proposes a magnetic assembly and positioning fixture for solid engine housing shells.

[0006] This invention comprises a tooling housing and a magnetic core, with the magnetic core located within the tooling housing. The lower surface of the positioning tooling is an arc surface, the curvature of which is the same as the curvature of the surface of the solid engine housing it mates with. The two circumferential surfaces of the arc surface of the positioning tooling are respectively a first assembly reference surface and a second assembly reference surface. The axial dimension of the housing is ensured by the first and second assembly reference surfaces. Vertical positioning reference grooves are respectively provided on the two axial side surfaces of the positioning tooling; and the planes of symmetry in the width direction of these positioning reference grooves coincide with the center planes of symmetry in the width of their respective side surfaces.

[0007] The positioning fixture surfaces at the upper ends of the first and second assembly reference surfaces each have an L-shaped notch to indicate the placement direction of the positioning fixture.

[0008] The tooling housing is made of steel and has a square outer shape and a circular inner shape. Its geometric center has a magnetic core mounting hole that runs through both the upper and lower surfaces. At the bottom of this mounting hole, there is a radially protruding annular boss on its inner surface. When the magnetic core is inserted into the mounting hole, it rests on the surface of this annular boss.

[0009] The positioning reference groove has a width of 0.1 mm and a depth of 0.2 mm.

[0010] The magnet core uses an N33 grade magnet with a diameter of 20mm and an axial height of 20mm.

[0011] In use, the positioning fixture is placed on the surface of the solid engine housing, with the indicator notch on the fixture's surface positioned circumferentially on the solid engine housing surface. The positioning reference grooves on the two side surfaces of the positioning fixture are aligned with the quadrant lines of the solid engine housing surface, fixing the relative position of the positioning fixture to the solid engine housing. Once the positioning fixture is fixed, the first set of two external components are placed on either side of the positioning fixture's circumference, with the positioning surfaces of each external component respectively aligned with the first and second assembly reference surfaces of the positioning fixture, thus achieving the positioning of the two external components. The first set of two external components is then fixed. This completes the positioning of the first set of two external components.

[0012] After positioning the first set of two external components, remove the positioning fixture and move it axially along the solid rocket motor housing to the mounting point of the second set of external components. Determine the position of the second set of external components using the same positioning method as the first set of two external components. The positioning of the second set of two external components is then complete.

[0013] Repeat the positioning process of the second group of external components to complete the positioning of the remaining groups of external components in sequence.

[0014] This invention addresses the positioning problem of irregularly shaped external components evenly distributed along the axial direction of an engine casing by proposing a magnetic assembly positioning fixture. This fixture enables rapid positioning and convenient disassembly, achieving rapid assembly and positioning welding of solid engine metal casings. It solves the assembly and positioning problem of irregularly shaped casings. Using this magnetic assembly positioning fixture, rapid and accurate positioning of the casing surface can be achieved, improving production efficiency.

[0015] This invention utilizes tooling to assemble irregularly shaped shells, reducing the amount of scribing work and ensuring the radial assembly dimensions of the shells. The tooling allows for the simultaneous assembly of two irregularly shaped shells, improving assembly efficiency. Dimensional inspection only requires measuring the axial dimensions; the radial dimensions are guaranteed by the tooling and do not require measurement, further reducing the workload of inspection personnel. Using this invention for the assembly and positioning of such irregularly shaped external parts not only improves the accuracy of assembly dimensions but also significantly reduces scribing and inspection work, resulting in a substantial increase in production efficiency. Attached Figure Description

[0016] Figure 1 A schematic diagram showing the positions of the solid rocket motor housing and external components.

[0017] Figure 2 View A shows the solid engine housing and outer casing assembly position.

[0018] Figure 3 Main view of the magnetic assembly positioning fixture.

[0019] Figure 4 Top view of the magnetic assembly positioning fixture.

[0020] Figure 5 A cross-sectional view of the magnetic assembly positioning fixture.

[0021] Figure 6 Assemble the front view of the outer shell.

[0022] Figure 7 Assemble the left view of the outer casing.

[0023] In the figure: 1. Engine housing; 2. External component; 3. Magnet core; 4. Positioning fixture; 5. First assembly reference surface; 6. Second assembly reference surface; 7. Fixture housing; 8. Positioning reference groove; 9. Indicator notch. Detailed Implementation

[0024] This embodiment is a magnetic assembly positioning fixture. The positioning fixture 4 consists of a fixture housing 7 and a magnetic core 3, with the magnetic core located inside the fixture housing. The lower surface of the positioning fixture is an arc surface, the curvature of which is the same as the curvature of the surface of the solid rocket motor housing it mates with. The two circumferential surfaces of the arc surface of the positioning fixture are a first assembly reference surface 5 and a second assembly reference surface 6, respectively. The axial dimension of the housing is ensured by the first and second assembly reference surfaces. The positioning fixture surfaces at the upper ends of the first and second assembly reference surfaces have L-shaped indicator notches 9 to indicate the placement direction of the positioning fixture. Vertical positioning reference grooves 8 are provided on the two axial side surfaces of the positioning fixture; the symmetrical planes of the width direction of the positioning reference grooves 8 coincide with the symmetrical center planes of the width of their respective side surfaces.

[0025] The positioning reference groove 8 has a width of 0.1 mm and a depth of 0.2 mm.

[0026] The tooling housing 7 is made of steel and has a square outer shape and a circular inner shape. Its geometric center has a magnetic core mounting hole that runs through both the upper and lower surfaces. At the bottom of this mounting hole, there is a radially protruding annular boss on its inner surface. When the magnetic core 3 is inserted into this mounting hole, it rests on the surface of the annular boss.

[0027] The magnet core uses an N33 grade magnet. The magnet core has a diameter of 20 mm and an axial height of 20 mm.

[0028] In use, the positioning fixture 4 is placed on the surface of the solid engine housing, with the L-shaped notch on the surface of the positioning fixture located in the circumferential direction of the solid engine housing surface. The positioning reference grooves 8 on the two side surfaces of the positioning fixture are aligned with the quadrant lines of the solid engine housing surface, thus fixing the relative position of the positioning fixture to the solid engine housing.

[0029] Once the positioning fixture is fixed in position, the two outer components 2 of the first group are placed on both sides of the positioning fixture, and the positioning surfaces of each outer component are aligned with the first assembly reference surface 5 and the second assembly reference surface 6 of the positioning fixture, thereby achieving the positioning of the two outer components. The two outer components of the first group are then fixed. This completes the positioning of the two outer components of the first group.

[0030] After positioning the first set of two external components, remove the positioning fixture and move it axially along the solid rocket motor housing to the mounting point of the second set of external components. Determine the position of the second set of external components using the same positioning method as the first set of two external components. The positioning of the second set of two external components is then complete.

[0031] Repeat the positioning process of the second group of external components to complete the positioning of the remaining groups of external components in sequence.

[0032] At this point, the location of all external components is complete.

[0033] This invention uses a magnetic core to attach the tooling to the surface of the housing, preventing misalignment during assembly and improving assembly reliability. The first assembly reference surface 5 and the second assembly reference surface 6 ensure the circumferential position of each external component on the solid engine housing.

[0034] This invention solves the problem of assembling and positioning irregularly shaped shells. By using this magnetic assembly and positioning fixture, the shell surface can be quickly and accurately positioned, thus improving production efficiency.

Claims

1. A magnetic assembly and positioning fixture for an outer component of a solid engine casing, characterized in that, It consists of a tooling housing (7) and a magnet core (3), and the magnet core is located inside the tooling housing; the lower surface of the positioning tooling is an arc surface, and the curvature of the arc surface is the same as the curvature of the solid engine housing surface that it mates with; the two circumferential surfaces of the arc surface of the positioning tooling are respectively the first assembly reference surface (5) and the second assembly reference surface (6); the axial dimension of the outer component is guaranteed by the first assembly reference surface and the second assembly reference surface; there are vertical positioning reference grooves (8) on the two side surfaces of the positioning tooling in the axial direction; and the symmetry plane of the positioning reference groove in the width direction coincides with the symmetry center plane of the width of the side surface.

2. The magnetic assembly and positioning fixture for the outer components of a solid engine housing as described in claim 1, characterized in that, There are indicator notches (9) on the upper end of the first assembly reference surface (5) and the upper end of the second assembly reference surface (6) to indicate the placement direction of the positioning fixture.

3. The magnetic assembly and positioning fixture for the outer components of a solid engine housing as described in claim 1, characterized in that, The tooling housing (7) is made of steel and has a square outer shape and a round inner shape. Its geometric center has a magnetic core mounting hole that runs through the upper and lower surfaces. There is a radially protruding annular boss on the inner surface at the bottom of the magnetic core mounting hole. When the magnetic core (3) is placed into the magnetic core mounting hole, the magnetic core sits on the surface of the annular boss.

4. The magnetic assembly and positioning fixture for the outer components of a solid engine housing as described in claim 1, characterized in that, The positioning reference groove (8) has a width of 0.1 mm and a depth of 0.2 mm.

5. The magnetic assembly and positioning fixture for the outer components of a solid engine housing as described in claim 1, characterized in that, The magnet core (3) is an N33 magnet with a diameter of 20 mm and an axial height of 20 mm.

6. The magnetic assembly and positioning fixture for the outer components of a solid engine housing as described in claim 2, characterized in that, In use, the positioning fixture (4) is placed on the surface of the solid engine housing, and the indicator notch on the surface of the positioning fixture is located in the circumferential direction of the surface of the solid engine housing; the positioning reference grooves (8) on the two side surfaces of the positioning fixture are aligned with the quadrant lines on the surface of the solid engine housing, and the relative position between the positioning fixture and the solid engine housing is fixed; after the position of the positioning fixture is fixed, the two outer parts (2) of the first group are placed on the two sides of the circumferential direction of the positioning fixture, and the positioning surfaces of each outer part are respectively attached to the first assembly reference surface (5) and the second assembly reference surface (6) of the positioning fixture, thereby realizing the positioning of the two outer parts; the two outer parts of the first group are fixed; thus, the positioning of the two outer parts of the first group is completed.

7. The magnetic assembly and positioning fixture for the outer components of a solid engine housing as described in claim 6, characterized in that, After the positioning of the first two external components is completed, the positioning fixture is removed and moved axially along the solid engine housing to the mounting point of the second external component; the position of the second external component is determined according to the positioning method of the first two external components; the positioning of the second two external components is completed. Repeat the positioning process of the second group of external components to complete the positioning of the remaining groups of external components in sequence.

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