Sand core mold with sand consolidation shaft sleeve

Abstract

According to the sand core mold containing the sand consolidation shaft sleeves, the sand consolidation shaft sleeves are arranged on the inner sides of the end socket sand core melon petals and the inner sides of the cylinder section sand core melon petals, so that the core shaft cannot be in direct contact with core sand, and the core shaft is protected against damage; in addition, according to the sand core mold containing the sand consolidation shaft sleeve, key grooves are formed in one sides in all the sand consolidation mandrels, and all the key grooves located on the same side jointly form a limiting key groove which axially extends in the sand core mold containing the sand consolidation shaft sleeve. Meanwhile, limiting keys matched with the limiting key grooves are arranged at the corresponding positions of the mandrel, relative sliding between the sand core mold and the mandrel is limited, the final forming quality of the rocket barrel is guaranteed, and the rocket barrel mold is suitable for industrial large-scale use and popularization.

Description

Technical Field

[0001] The utility model belongs to the field of solid rocket engine manufacturing, in particular to a sand core mold containing a sand-solidifying shaft sleeve. Background Art

[0002] The sand core mold is a mold used to manufacture composite material shells of solid rocket engines. Specifically, it is a core mold made of sand, adhesive and hollow glass beads. The adhesive is water-soluble. After the product prepared using the sand core mold is formed, hot water is injected. The sand core mold collapses under the action of water, and demolding is very easy. It has significant advantages in the production of composite material containers with small openings and large volumes. Therefore, sand core molds have been widely used in the manufacture of composite material shells of solid rocket engines.

[0003] The existing sand core mold has the following problems: First, the core shaft is easily scratched. Since the main component of the sand core mold is sand grains, the surface of the sand core is relatively rough. At the same time, the core shaft and the sand core are in direct contact. The sand core will repeatedly rub against the core shaft during the process of being installed on and removed from the core shaft, causing the core shaft to be scratched; second, the core shaft and the sand core are prone to relative sliding. The relative sliding between the core shaft and the sand core is mainly prevented by friction. During the winding process, when the tension is high or the diameter of the scratched core shaft becomes smaller, the molding quality is affected. Utility Model Content

[0004] The purpose of the utility model is to provide a sand core mold containing a sand-fixing sleeve and a method of use, so as to solve the problems in the prior art that the sand core mold easily causes scratches on the core shaft and the core shaft and sand core easily cause relative sliding, thereby affecting the molding quality.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A sand core mold with a sand consolidation sleeve includes a plurality of melon segments and a core shaft. The melon segments include two end-sand core melon segments and a plurality of barrel-segment sand core melon segments. The plurality of barrel-segment sand core melon segments are arranged in parallel and fixedly disposed between the two end-sand core melon segments. The core shaft passes through the two end-sand core melon segments and the plurality of barrel-segment sand core melon segments, and its two ends extend out of the two end-sand core melon segments.

[0007] It is characterized in that the barrel segment sand core melon segment comprises an annular outer shell, an annular barrel segment sand core ring is arranged inside the outer shell, and the radial cross section of the barrel segment sand core melon segment is "T" shaped;

[0008] The head sand core melon segment is a basin-shaped structure with one end open and the other end closed. A through hole is provided in the middle of the closed end of the head sand core melon segment. The shape of the open end of the head sand core melon segment matches the shape of the side wall of the outer shell of the barrel section sand core melon segment.

[0009] The inner ring of the barrel sand core ring and the inner ring of the through hole of the head sand core melon segment are both connected with a sand consolidation sleeve;

[0010] The inner diameter of the sand consolidation sleeve matches the outer diameter of the core shaft;

[0011] A keyway is provided on one side of the inner ring of all the sand consolidating sleeves, and a limiting key matching the keyway and extending along its own axial direction is provided at a relative position of the core shaft.

[0012] The utility model also has the following features:

[0013] Furthermore, the outer shell is provided with a plurality of through vent holes evenly distributed along the circumference;

[0014] The central axes of all the vent holes are parallel to the central axis of the outer shell.

[0015] Furthermore, a plurality of through-holes for reducing weight are evenly opened on the sand core ring of the barrel section along the circumferential direction;

[0016] The central axes of all the weight-reducing holes are parallel to the central axis of the outer shell.

[0017] Compared with the prior art, the present invention has the following technical effects:

[0018] The sand core mold with sand-fixing sleeves of the utility model is provided with sand-fixing sleeves on the inner sides of the head sand core melon slices and the barrel sand core melon slices, thereby preventing the core shaft from directly contacting the core sand and protecting the core shaft from damage;

[0019] In addition, the sand core mold containing the sand-fixing sleeve of the utility model is provided with a keyway on one side of all the sand-fixing core shafts, and all the keyways on the same side together form a limit keyway extending axially inside the sand core mold containing the sand-fixing sleeve; at the same time, there is a limit key matching the limit keyway at the corresponding position of the core shaft, which limits the relative sliding between the sand core mold and the core shaft, thereby ensuring the molding quality of the final rocket launcher body, and is suitable for large-scale use and promotion in industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a cross-sectional view of the overall structure of the sand core mold of the sand consolidation sleeve of the utility model;

[0021] Figure 2 This is a cross-sectional view of the melon wedge of the head sand core in the utility model;

[0022] Figure 3 This is a cross-sectional view of the barrel section sand core melon wedge in the utility model;

[0023] Figure 4 It is a schematic diagram of the core shaft structure in the utility model.

[0024] The meaning of the symbols in the figure is:

[0025] 1. Head sand core melon slices; 2. Cylinder sand core melon slices; 3. Core shaft; 4. Outer shell; 5. Cylinder sand core ring; 6. Sand consolidation sleeve; 7. Keyway; 8. Limit key; 9. Vent hole; 10. Weight reduction hole. DETAILED DESCRIPTION

[0026] It should be noted that, unless otherwise specified, all components in the present invention are components known in the prior art. For example, the core shaft is a known and commonly used core shaft.

[0027] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent modifications made on the basis of the technical solution of this application fall within the scope of protection of the present invention.

[0028] like Figure 1-4 As shown, a sand core mold containing a sand consolidation sleeve includes a plurality of melon segments, which include two end-sand core melon segments 1 and a plurality of barrel-segment sand core melon segments 2; the plurality of barrel-segment sand core melon segments 2 are arranged in parallel and fixedly disposed between the two end-sand core melon segments 1;

[0029] A core shaft 3 is axially arranged inside the sand core mold containing the sand consolidation sleeve, and both ends of the core shaft 3 extend out of the two end-sealed sand core melon segments 1;

[0030] The barrel segment sand core melon segment 2 comprises an annular outer shell 4, an annular barrel segment sand core ring 5 is arranged inside the outer shell 4, and the axial cross section of the barrel segment sand core melon segment 2 is "T" shaped;

[0031] The head sand core melon segment 1 is a basin-shaped structure with one end open and the other end closed, and a through hole is opened in the middle of the closed end of the head sand core melon segment 1; the shape of the open end of the head sand core melon segment 1 matches the shape of the side wall of the outer shell 4;

[0032] The inner ring of the barrel sand core ring 5 and the inner ring of the through hole of the head sand core melon segment 1 are both connected with a sand consolidation sleeve 6;

[0033] The inner diameter of the sand consolidation sleeve 6 matches the outer diameter of the core shaft 3;

[0034] A keyway 7 is provided on one side of the inner ring of each sand consolidation sleeve 6, and a limiting key 8 matching the keyway 7 and extending along its own axial direction is provided on the core shaft 3 at a relative position.

[0035] The sand core mold with a sand-fixing sleeve of the utility model is provided with a sand-fixing core shaft 6 inside the head sand core melon segment 1 and the barrel section sand core melon segment 3, respectively, so that the molded melon segments have a corresponding sand-fixing core shaft 6 inside, thereby preventing the core shaft 3 from directly rubbing against the core sand, thereby protecting the core shaft 3 from damage;

[0036] In addition, a key groove 7 is opened on one side of all the sand-fixing core shafts 6, and all the key grooves 7 on the same side together form a limit key groove extending axially inside the sand core mold containing the sand-fixing shaft sleeve; at the same time, a limit key 8 matching the limit key groove is arranged at a relative position on the core shaft 3, and the relative sliding between the sand core mold and the core shaft 3 ensures the molding quality of the final rocket launcher body.

[0037] As a preferred solution, a plurality of through vent holes 9 are uniformly opened along the circumference of the outer shell 4;

[0038] The central axis of all vent holes 9 is parallel to the central axis of the outer shell 4. The multiple vent holes 9 enhance the air permeability of the barrel sand core melon segment 2.

[0039] As a preferred solution, multiple through-holes 10 are uniformly and circumferentially formed on the barrel sand core ring 5; the central axes of all holes 10 are parallel to the central axis of the outer shell 4. Providing holes 10 in the barrel sand core segments 2 reduces the amount of core sand used, saving resource costs while also reducing the weight of the segments and, consequently, the weight of the entire sand core mold, including the sand-consolidating sleeve.

Claims

1. A sand core mold containing a sand-fixing sleeve, comprising a plurality of melon slices and a core shaft (3), wherein the melon slices comprise two end-seal sand core melon slices (1) and a plurality of barrel-segment sand core melon slices (2); the plurality of barrel-segment sand core melon slices (2) are arranged in parallel and fixedly disposed between the two end-seal sand core melon slices (1); the core shaft (3) passes through the interior of the two end-seal sand core melon slices (1) and the plurality of barrel-segment sand core melon slices (2), and has both ends extending out of the two end-seal sand core melon slices (1); It is characterized by: The barrel segment sand core melon segment (2) comprises an annular outer shell (4), an annular barrel segment sand core ring (5) is arranged inside the outer shell (4), and the radial cross section of the barrel segment sand core melon segment (2) is "T"-shaped; The head sealing sand core melon segment (1) is a basin-shaped structure with one end open and the other end closed, and a through hole is provided in the middle of the closed end of the head sealing sand core melon segment (1); the shape of the open end of the head sealing sand core melon segment (1) matches the shape of the side wall of the outer shell (4) of the barrel segment sand core melon segment (2); The inner ring of the barrel sand core ring (5) and the inner ring of the through hole of the head sand core melon segment (1) are both connected to a sand fixing sleeve (6); The inner diameter of the sand-consolidating sleeve (6) matches the outer diameter of the core shaft (3); A keyway (7) is provided on one side of the inner ring of all the sand-consolidating sleeves (6), and a limiting key (8) matching the keyway (7) and extending along its own axial direction is provided at a relative position of the core shaft (3).

2. The sand core mold containing a sand consolidation sleeve according to claim 1, characterized in that: The outer shell (4) is provided with a plurality of through vent holes (9) evenly distributed along the circumference; The central axes of all the vent holes (9) are parallel to the central axis of the outer shell (4).

3. The sand core mold containing a sand consolidation sleeve according to claim 1, characterized in that: The barrel section sand core ring (5) is evenly provided with a plurality of through-holes (10) along the circumferential direction; The central axes of all the weight-reducing holes (10) are parallel to the central axis of the outer shell (4).

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