Sand core mold forming mold with sand consolidation shaft sleeve

Abstract

According to the sand core mold forming mold containing the sand consolidating shaft sleeves, the first sand consolidating shaft sleeves and the second sand consolidating shaft sleeves are arranged in the end socket sand core scalloped segment mold and the cylinder section sand core scalloped segment mold respectively, so that the first sand consolidating shaft sleeves and the second sand consolidating shaft sleeves are correspondingly arranged in formed scalloped segments; therefore, direct friction between the core shaft and the core sand is avoided, and the core shaft is protected from being damaged; in addition, according to the sand core mold forming mold containing the sand consolidation shaft sleeves, key grooves are formed in one sides in all the sand consolidation shaft sleeves, and all the key grooves located in the same side jointly form limiting key grooves axially extending in the sand core mold forming mold containing the sand consolidation shaft sleeves; meanwhile, limiting keys matched with the limiting key grooves are arranged at the opposite positions of the mandrel, relative sliding between the manufactured sand core mold containing the sand fixing shaft sleeve 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 forming die 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. The core mold is made of sand, adhesive and hollow glass beads. The adhesive is water-soluble. After the product 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 materials containers with small openings and large volumes. Therefore, sand core molds have been widely used in the manufacture of composite materials shells of solid rocket engines.

[0003] The sand core mold generated by the molding mold in the prior art has the following problems: first, the core shaft is easily scratched. Since the main component of the sand core mold is sand particles, 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 scratches on the core shaft; second, the core shaft and the sand core are prone to relative sliding. The core shaft and the sand core are mainly prevented from relative sliding by friction. During the winding process, when the tension is large or the diameter of the scratched core shaft becomes smaller, the core shaft and the sand core are prone to relative sliding, affecting the molding quality. Utility Model Content

[0004] The utility model aims to provide a sand core mold forming mold containing a sand-fixing sleeve to solve the problems in the prior art that the sand core mold generated by the forming mold is easy to cause scratches on the core shaft and the core shaft and the sand core are easy to slide relative to each other, thus affecting the molding quality.

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

[0006] A sand core mold forming mold containing a sand-solidifying sleeve, wherein the sand core mold containing the sand-solidifying sleeve comprises a plurality of melon petals; wherein the melon petals comprise two end-seal sand core melon petals and a plurality of barrel segment sand core melon petals; a plurality of barrel segment sand core melon petals are arranged in parallel and fixedly disposed between two end-seal sand core melon petals; a core shaft is axially disposed inside the sand core mold containing the sand-solidifying sleeve, and both ends of the core shaft extend out of the two end-seal sand core melon petals; characterized in that it comprises an end-seal sand core melon petal mold for manufacturing an end-seal sand core melon petal and a barrel segment sand core melon petal mold for manufacturing a barrel segment sand core melon petal;

[0007] The head sand core melon slice mold comprises a coaxially arranged female mold, a male mold and a first sand-fixing sleeve; the female mold and the male mold are both basin-shaped structures, and a first through hole is opened in the middle of the closed end of both; the male mold is arranged inside the female mold through the first sand-fixing sleeve, and the end surfaces of the male mold and the open end of the female mold are flush;

[0008] The described segment core melon-petal mold includes an outer cylinder body, and an upper mold, a lower mold and a second sand-fixing sleeve are coaxially arranged inside the outer cylinder body;

[0009] The upper mold and the lower mold are of the same shape of a basin structure; the closed ends of the upper mold and the lower mold are coaxially connected through the second sand-fixing sleeve, and second through holes are formed in the middle of the closed ends of both, and the second through holes have the same diameter as the first through hole;

[0010] The end faces of the open ends of the upper mold and the lower mold are flush with the two end faces of the outer cylinder body respectively, and an annular space is present between the outer walls of the open ends of the upper mold and the lower mold and the inner wall of the outer cylinder body;

[0011] The outer side of the open end of the lower mold is fixedly connected with the outer cylinder body through an annular connecting plate;

[0012] The inner diameter of the outer cylinder body is equal to the inner diameter of the open end of the female mold;

[0013] The inner diameters of the first sand-fixing sleeve and the second sand-fixing sleeve both match the outer diameter of the core shaft;

[0014] Key grooves are formed on one side of the inner ring of all the second sand-fixing sleeves, and limiting keys which are matched with the key grooves and extend along the axial direction of the core shaft are arranged at the corresponding positions of the core shaft.

[0015] The present utility model further has the following features:

[0016] Further, fastening nuts are arranged at the joints of the female mold and the male mold and the core shaft.

[0017] Further, a plurality of air-permeable pins are detachably and evenly arranged along the circumferential direction on the connecting plate;

[0018] The upper parts of all the air-permeable pins are higher than the upper end face of the outer cylinder body, and all are located between the lower mold and the outer cylinder body.

[0019] Further, a plurality of weight-reducing columns are further included;

[0020] Through holes equal in number to the weight-reducing columns are formed along the circumferential direction on the closed end of the upper mold;

[0021] Penetrating mounting holes corresponding to the through holes one by one are formed along the circumferential direction on the closed end of the lower mold;

[0022] Each weight-reducing column penetrates through one through hole and one mounting hole correspondingly at the same time.

[0023] Compared with the prior art, the present utility model has the following technical effects:

[0024] The core mold forming die of the present utility model containing a sand-fixing bushing is provided with a first sand-fixing bushing and a second sand-fixing bushing respectively inside the head core segment die and the barrel core segment die, so that the corresponding parts inside the formed segment are respectively provided with the first sand-fixing bushing and the second sand-fixing bushing, thereby preventing the core shaft from directly rubbing against the core sand and protecting the core shaft from damage.

[0025] In addition, one side of all the sand-fixing bushings of the core mold forming die of the present utility model is provided with key grooves, and all the key grooves on the same side together form a limiting key groove extending axially inside the core mold forming die containing the sand-fixing bushing; at the same time, limiting keys matching the limiting key groove are arranged at corresponding positions on the core shaft to limit the relative sliding between the formed core mold containing the sand-fixing bushing and the core shaft, ensuring the forming quality of the final rocket barrel, and being suitable for large-scale industrial use and promotion. Brief Description of the Drawings

[0026] Figure 1 is a cross-sectional view of the head core segment die in the present utility model;

[0027] Figure 2 is a cross-sectional view of the barrel core segment die in the present utility model;

[0028] Figure 3 is a schematic structural view of the core shaft in the present utility model.

[0029] The meanings of the reference numerals in the drawings are as follows: 1, head core segment die; 2, barrel core segment die; 3, first sand-fixing bushing; 4, second sand-fixing bushing; 5, core shaft; 6, key groove; 7, limiting key; 8, fastening nut; 9, vent pin; 10, weight-reducing column; 101, female mold; 102, male mold; 201, outer cylinder; 202, upper mold; 203, lower mold; 204, connecting plate. Detailed Description of the Preferred Embodiments

[0030] It should be noted that all the components in the present utility model, unless otherwise specified, are all components known in the prior art. For example, the core shaft is a commonly known and commonly used core shaft.

[0031] The following are specific embodiments of the present utility model. It should be noted that the present utility model is not limited to the following specific embodiments, and all equivalent transformations made on the basis of the technical solutions of this application fall within the protection scope of the present utility model.

[0032] Such as Figures 1-3As shown in the figure, a core mold forming die containing a sand-fixing bushing, wherein the core mold containing the sand-fixing bushing includes a plurality of segments, among which the segments include two end-head core segments and a plurality of cylindrical core segments; the plurality of cylindrical core segments are arranged in parallel between the two end-head core segments; a core shaft 5 is arranged axially inside the core mold containing the sand-fixing bushing, and both ends of the core shaft 5 extend outside the two end-head core segments;

[0033] The core mold forming die containing the sand-fixing bushing includes an end-head core segment die 1 and a cylindrical core segment die 2;

[0034] The end-head core segment die 1 is used to manufacture the end-head core segments; the cylindrical core segment die 2 is used to manufacture the cylindrical core segments;

[0035] The end-head core segment die 1 includes a female mold 101, a male mold 102 and a first sand-fixing bushing 3 which are coaxially arranged. The female mold 101 and the male mold 102 are both in a basin-like structure, and a first through hole is opened in the middle of the closed ends of both of them; the male mold 102 is arranged inside the female mold 101 through the first sand-fixing bushing 3, and the end faces of the open ends of the male mold 102 and the female mold 101 are flush.

[0036] The cylindrical core segment die 2 includes an outer cylinder 201, and an upper mold 202, a lower mold 203 and a second sand-fixing bushing 4 are coaxially arranged inside the outer cylinder 201.

[0037] The upper mold 202 and the lower mold 203 are both in a basin-like structure with the same shape; the closed ends of the upper mold 202 and the lower mold 203 are coaxially connected through the second sand-fixing bushing 4, and a second through hole is opened in the middle of the closed ends of both of them, and the aperture of the second through hole is equal to that of the first through hole.

[0038] The end faces of the open ends of the upper mold 202 and the lower mold 203 are respectively flush with the two end faces of the outer cylinder 201, and there is an annular space between the side walls of the open ends of the upper mold 202 and the lower mold 203 and the inner wall of the outer cylinder 201.

[0039] The outside of the open end of the lower mold 203 is fixedly connected with the outer cylinder 201 through an annular connecting plate 204.

[0040] The inner diameter of the outer cylinder 201 is equal to the inner diameter of the open end of the female mold 101.

[0041] The inner diameters of the first sand-fixing bushing 3 and the second sand-fixing bushing 4 are both matched with the outer diameter of the core shaft 5.

[0042] A keyway 6 is opened on one side of the inner ring of all the second sand-fixing bushings 4, and a limit key 7 which is matched with the keyway 6 and extends along the axial direction of the core shaft 5 is arranged at the corresponding position of the core shaft 5.

[0043] The core mold forming die of the utility model containing a sand-fixing bushing is provided with a first sand-fixing bushing 3 and a second sand-fixing bushing 4 inside the head core segment die 1 and the cylinder segment core segment die 2 respectively, so that the corresponding inner parts of the formed segments are provided with the first sand-fixing bushing 3 and the second sand-fixing bushing 4, and further the mandrel 5 is not easily in direct friction with the core sand, protecting the mandrel from damage.

[0044] In addition, on one side of all the sand-fixing bushings of the core mold forming die of the utility model, key grooves 6 are opened, and all the key grooves on the same side together form a limiting key groove extending axially inside the core mold forming die containing the sand-fixing bushing; meanwhile, a limiting key 7 matching the limiting key groove is arranged at the relative position of the mandrel 6, restricting the relative sliding between the formed core mold containing the sand-fixing bushing and the mandrel, ensuring the forming quality of the final rocket cylinder body, and being suitable for large-scale industrial use and popularization.

[0045] As a preferred scheme, a fastening nut 8 is arranged at the connection part between the female die 101 and the mandrel 5, further enhancing the strength of the head core segment die 1.

[0046] As a preferred scheme, a plurality of vent pins 9 are detachably and evenly distributed along the circumference on the connecting plate 204;

[0047] The upper ends of all the vent pins 9 are higher than the upper end face of the outer cylinder 201, and all are located between the lower die 203 and the outer cylinder 201. With this setting, the corresponding head core segment can be provided with vent holes, enhancing the air permeability of the head core segment.

[0048] As a preferred scheme, it further includes a plurality of weight-reducing columns 10;

[0049] Through holes equal in number to the weight-reducing columns 10 are opened along the circumference at the closed end of the upper die 202;

[0050] Through installation holes corresponding one by one to the through holes are opened along the circumference at the closed end of the lower die 203;

[0051] Each weight-reducing column 10 simultaneously penetrates through one through hole and one installation hole correspondingly.

[0052] With this setting, not only can the finally formed cylinder segment core segment be in a "T" shape, ensuring the strength and stiffness of the cylinder segment core segment, but also the corresponding cylinder segment core segment is provided with weight-reducing holes, reducing the amount of core sand used, saving resource costs while reducing the weight of the segment, and further reducing the overall weight of the formed core mold containing the sand-fixing bushing.

Claims

1. A core mold forming die containing a sand-fixing bushing, wherein the core mold containing the sand-fixing bushing comprises a plurality of segments; among them, The melon petals include two head core melon petals and multiple barrel core melon petals; the multiple barrel core melon petals are arranged side by side and fixedly disposed between the two head core melon petals; a core shaft (5) is axially arranged inside the core mold containing the sand-fixing bushing, and both ends of the core shaft (5) extend outside the two head core melon petals; characterized in that it includes a head core melon petal mold (1) for manufacturing the head core melon petals and a barrel core melon petal mold (2) for manufacturing the barrel core melon petals; The head core melon petal mold (1) includes a female mold (101), a male mold (102) and a first sand-fixing bushing (3) arranged coaxially; both the female mold (101) and the male mold (102) are in a basin-like structure, and a first through hole is opened in the middle of the closed ends of both; the male mold (102) is arranged inside the female mold (101) through the first sand-fixing bushing (3), and the end faces of the open ends of the male mold (102) and the female mold (101) are flush; The barrel core melon petal mold (2) includes an outer cylinder (201), and an upper mold (202), a lower mold (203) and a second sand-fixing bushing (4) are coaxially arranged inside the outer cylinder (201); The upper mold (202) and the lower mold (203) are in basin-like structures with the same shape; the closed ends of the upper mold (202) and the lower mold (203) are coaxially connected through the second sand-fixing bushing (4), and a second through hole is opened in the middle of the closed ends of both, and the second through hole has the same diameter as the first through hole; The end faces of the open ends of the upper mold (202) and the lower mold (203) are flush with the two end faces of the outer cylinder (201) respectively, and there is an annular space between the outer walls of the open ends of the upper mold (202) and the lower mold (203) and the inner wall of the outer cylinder (201); The outer side of the open end of the lower mold (203) is fixedly connected to the outer cylinder (201) through an annular connecting plate (204); The inner diameter of the outer cylinder (201) is equal to the inner diameter of the open end of the female mold (101); The inner diameters of both the first sand-fixing bushing (3) and the second sand-fixing bushing (4) are matched with the outer diameter of the core shaft (5); A keyway (6) is opened on one side of the inner ring of all the second sand-fixing bushings (4), and a limit key (7) that is matched with the keyway (6) and extends along its own axis is arranged at the corresponding position of the core shaft (5).

2. The core mold forming die containing a sand-fixing bushing according to claim 1, characterized in that, Fastening nuts (8) are arranged at the connection positions of both the female mold (101) and the male mold (102) and the core shaft (5).

3. The core mold forming die containing a sand-fixing bushing as described in claim 1, characterized in that, A plurality of air-permeable pins (9) are detachably and evenly arranged on the connecting plate (204) along the circumferential direction; The upper parts of all the air-permeable pins (9) are higher than the upper end face of the outer cylinder (201), and are all located between the lower mold (203) and the outer cylinder (201).

4. The sand core mold forming die containing a sand-fixing bushing as described in claim 1 is characterized in that, It also includes a plurality of weight-reducing columns (10); Through holes equal in number to the weight-reducing columns (10) are opened along the circumferential direction at the closed end of the upper mold (202); Installation holes that are through and correspond one by one to the through holes are opened along the circumferential direction at the closed end of the lower mold (203); Each weight-reducing column (10) simultaneously penetrates through one through hole and one installation hole correspondingly.

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