A complex marine propeller sand mold

Abstract

This invention relates to the field of sand mold technology, specifically to a complex marine propeller sand mold. It includes a riser sand block, blade sand block, base sand block, and sealing sand block; the riser sand block, blade sand block, and base sand block are placed sequentially, effectively solving the problem of excessively large sand mold size. The riser sand block, blade sand block, and base sand block are engaged by locking blocks and slots, facilitating hoisting, assembly, and positioning, and reducing the risk of fire. The upper end of the lifting core is integrally formed with the top of the riser sand block; this reduces the degree of freedom of the lifting core and solves the problems of difficult lifting core design and low assembly accuracy. The blade sand block is entirely continuous, allowing observation and painting of the blade cavity surface from either the hub end or the blade tip end. After the paint dries, the sealing sand block is directly inserted into the blade tip for sealing, effectively solving the problem of difficult painting of the blade cavity. Using the technical solution of this application, small, complex structure propellers can be manufactured with convenient construction, simple operation, and high dimensional accuracy of the blank.

Description

TECHNICAL FIELD

[0001] The present application relates to the sand mold technical field, specifically relates to a complex structure's marine propeller sand mold. BACKGROUND

[0002] Propeller refers to the blade in the air or water rotation, the rotating power of the engine into a propeller, can have two or more leaves connected with hub, the rear of the leaf is a spiral surface or approximately spiral surface of a kind of propeller. Propeller is divided into many kinds, and the application is also very wide, such as aircraft, ship propeller.

[0003] Marine propeller is the core component of ship power system, the traditional manufacturing process method generally adopts sand mold integral hand casting, that is, the blade modeling uses the shaped sand box with pitch gauge measuring instrument, and the hub modeling uses wooden mold sample. This molding method is more suitable for large and medium-sized marine propellers with large diameter and fewer blades, but for propellers with small diameter, many blades and complex hub structure, the operation difficulty is great, and many sets of molds are needed, which has problems of long manufacturing cycle, high cost and low blank precision.

[0004] At the same time, in the traditional casting method, the core hanging method is often used to fix the sand core for the hub structure with U-shaped or H-shaped longitudinal section, but the core hanging brings great difficulty to the molding process, and the misplacement is easy to occur during the molding, which causes poor size precision of the casting, and even the insufficient allowance.

[0005] In the prior art, due to the limitation of the forming size of the sand mold equipment, the relatively large propeller sand mold cannot be integrally casted, and in addition, the integral sand mold is also affected by the narrow structure space and other unfavorable factors, which brings difficulties to the placement of chill and the painting of coating after molding.

[0006] In order to prevent the propeller blade surface from sticking sand and improve the surface roughness of the blank, alcohol-based paint needs to be painted on the surface of the cavity during the molding of the propeller. The traditional large propeller molding can be directly and uniformly painted on the surface of the cavity for the convenience of opening and closing the box, but the space of the blade part of the integral sand mold is narrow, and the blade part is equivalent to the bottom of the blind hole, so the painting condition cannot be observed. SUMMARY

[0007] In order to solve the above technical problems, the present application provides a complex structure's marine propeller sand mold.

[0008] The technical scheme adopted by the present application is:

[0009] A sand mold of a complex structure of a marine propeller comprises a riser sand block 1, a blade sand block 2, a base sand block 3 and a blocking sand block 4; the base sand block 3 is provided with a protrusion 11, the blade sand block 2 is provided with a central hole 16, the lower sides of the base sand block 3 and the blade sand block 2 are engaged, the protrusion 11 is sleeved into the central hole 16, and a lower hub cavity is formed between the outer wall of the protrusion 11 and the inner wall of the central hole 16; the upper sides of the riser sand block 1 and the blade sand block 2 are engaged, the riser sand block 1 is integrally provided with a lifting core 6, an upper hub cavity is formed between the outer wall of the lifting core 6 and the inner wall of the blade sand block 2; a blade cavity 12 is arranged between the inner wall and the outer wall of the blade sand block 2, the blade cavity 12 penetrates through the inner wall and the outer wall of the blade sand block 2, and the outer wall of the blade sand block 2 is provided with the blocking sand block 4.

[0010] As preferred, the riser sand block 1 is provided with a top riser 13.

[0011] As preferred, the lower sides of the blade sand block 2 and the riser sand block 1 are provided with a clamping block 10, the upper sides of the base sand block 3 and the blade sand block 2 are provided with a clamping groove 5, and the clamping groove 5 and the clamping block 10 are engaged.

[0012] As preferred, the clamping block 10 and the clamping groove 5 are annular.

[0013] As preferred, the cross-sectional shape of the clamping block 10 and the clamping groove 5 is trapezoidal.

[0014] As preferred, the upper side of the base sand block 3 is fixed with a positioning screw 7, and the riser sand block 1 and the blade sand block 2 are provided with a positioning hole corresponding to the position of the positioning screw 7.

[0015] As preferred, the top of the positioning screw 7 is fixed by a cross reinforcing plate 8.

[0016] As preferred, the outer circumferential direction of the blocking sand block 4 is fixed by a steel wire 9.

[0017] As preferred, the blocking sand block 4 comprises a main plate 15 and a plug 14, the main plate 15 is provided with the plug 14 on one side, the plug 14 can be inserted into the blade cavity 12 to realize the outside sealing of the blade cavity 12.

[0018] The marine propeller sand mold with the above technical scheme has the following advantages:

[0019] 1. According to the special structural characteristics of the propeller, combined with the conventional propeller casting process, the propeller sand mold is divided into three parts according to the riser, the blade and the pouring system, namely the riser sand block, the blade sand block and the base sand block, and the blocking sand block is designed at the peripheral position of the blade to facilitate the brushing of the paint in the blade cavity. This design can not only solve the problem of oversize sand mold, but also facilitate the placement of chill and the brushing of paint in the later modeling stage.

[0020] 2. The invention solves the problems of long manufacturing period, high cost and low precision of small complex structure propeller in traditional propeller molding process, and has the advantages of convenient construction, simple operation and high precision of blank size.

[0021] 3. The riser sand block, blade sand block and base sand block are placed in sequence, effectively solving the problem of oversize sand mold. The riser sand block, blade sand block and base sand block are clamped through the clamping block and clamping groove, facilitating hoisting, assembling and positioning, and reducing the risk of fire running.

[0022] 4. The integrated riser sand block of the hanging core riser can solve the problem of difficult molding of the hanging core and ensure the assembly precision of the sand mold. In addition, the sand mold is reinforced by the reinforcing rib, which greatly reduces the risk of cracks or fractures.

[0023] 5. The design scheme of the plugging sand block effectively solves the problem of difficult painting of the blade cavity, and the steel wire is fixed in a whole circle to prevent defects such as flash and burr on the blank blade.

[0024] 6. The blade sand block is provided with a center hole, through which the surface of the blade cavity can be observed and painted from the hub end or the blade tip end. After the paint is dried, the plugging sand block is directly inserted into the blade tip for plugging, which effectively solves the problem of difficult painting of the blade cavity.

[0025] The small complex structure propeller manufactured by the technical scheme of the present application has the advantages of convenient construction, simple operation and high precision of blank size. The sand blocks can be disassembled, which facilitates the placement of chill and the painting of paint, and facilitates hoisting and assembly, improving the molding precision. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is the box closing structure schematic diagram of the present application.

[0027] Figure 2 is the riser sand block structure schematic diagram.

[0028] Figure 3 is the blade sand block and base sand block structure schematic diagram.

[0029] Figure 4 is the base sand block structure schematic diagram.

[0030] Figure 5 is the plugging sand block structure schematic diagram.

[0031] In the figure: 1, riser sand block; 2, blade sand block; 3, base sand block; 4, plugging sand block; 5, clamping groove; 6, hanging core; 7, positioning screw; 8, cross reinforcing plate; 9, steel wire; 10, clamping block; 11, protruding block; 12, blade cavity; 13, riser; 14, plug; 15, main plate; 16, center hole. DETAILED DESCRIPTION

[0032] The embodiments of the present application will be further described in detail with reference to the drawings and examples. The following examples are used to illustrate the present application, but cannot be used to limit the scope of the present application.

[0033] A specific embodiment of the present application is proposed:

[0034] As shown in Figure 1 , 2 , 3, 4, 5,

[0035] A complex structure of a marine propeller sand mold, comprising a riser sand block 1, a blade sand block 2, a base sand block 3 and a plugging sand block 4; the riser sand block 1 is provided with a top riser 13; the base sand block 3 is provided with a protrusion 11, the blade sand block 2 is provided with a center hole 16, the lower side of the blade sand block 2 and the riser sand block 1 is provided with a clamping block 10, the upper side of the base sand block 3 and the blade sand block 2 is provided with a clamping groove 5, the clamping block 10 and the clamping groove 5 are annular, the cross-sectional shape of the clamping block 10 and the clamping groove 5 is trapezoidal, the clamping groove 5 and the clamping block 10 are clamped, the protrusion 11 is sleeved into the center hole 16, and a lower hub cavity is formed between the outer wall of the protrusion 11 and the inner wall of the center hole 16; the upper side of the riser sand block 1 and the blade sand block 2 is clamped, the riser sand block 1 is integrally provided with a lifting core 6, an upper hub cavity is formed between the outer wall of the lifting core 6 and the inner wall of the blade sand block 2; a blade cavity 12 is arranged between the inner wall and the outer wall of the blade sand block 2, the blade cavity 12 penetrates the inner wall and the outer wall of the blade sand block 2, and the outer wall of the blade sand block 2 is provided with the plugging sand block 4.

[0036] The upper side of the base sand block 3 is fixedly provided with a positioning screw 7, the riser sand block 1 and the blade sand block 2 are provided with positioning holes corresponding to the position of the positioning screw 7, the top of the positioning screw 7 is fixedly connected through a cross reinforcing plate 8, and the outer circumferential direction of the plugging sand block 4 is fixedly connected through a steel wire 9. The plugging sand block 4 comprises a main plate 13 and a plug 14, one side of the main plate 13 is provided with the plug 14, the plug 14 can be inserted into the blade cavity 12, and the outer side of the blade cavity 12 is closed.

[0037] Specifically:

[0038] A complex structure of a marine propeller sand mold, the whole is cylindrical, the clamping block 10 can be embedded into the clamping groove 5 for fitting; after the box is closed, the upper and lower adjacent sand blocks are tightly attached. The design of the clamping block 10 and the protrusion 11 facilitates hoisting, assembly and positioning, prevents misplacement of the box, and also reduces the risk of fire on the parting surface.

[0039] By designing the clamping block 10 and the clamping groove 5, it is convenient to observe and align the upper and lower adjacent two layers of sand blocks during assembly and positioning, which is beneficial to rapid alignment and fitting.

[0040] The cross-sectional shape of the clamping block 10 is isosceles trapezoidal, that is, characterized by being narrow on the outside and wide on the inside; the clamping groove 5 structure is just the opposite, that is, characterized by being wide on the outside and narrow on the inside, and the concave-convex groove is isosceles trapezoidal structure, symmetrical structure, uniform stress in later stage, and reduces the risk of sand block collision during assembly.

[0041] The riser sand block 1, the blade sand block 2 and the base sand block 3 are uniformly provided with four positioning holes with a diameter of Φ12 mm on the same diameter circumference; the base sand block 3 is provided with a positioning screw 7 corresponding to the positioning hole; during assembly, the positioning holes of the upper sand blocks are sequentially threaded through the positioning screw 7, and finally the uppermost riser sand block 1 is tightened through the bolt. Through the design of the positioning hole and the positioning screw 7, the adjacent two layers of sand blocks can be quickly assembled, and at the same time, the three layers of sand blocks can be axially fixed, further reducing the risk of parting surface.

[0042] The circumferential gap between the clamping groove 5 and the clamping block 10 and the positioning hole is 1 mm, which is convenient for adaptive assembly.

[0043] The hanging core 6 is integrally formed with the riser sand block 1; the design of the open riser 13 avoids the adverse effects of the blind riser on feeding.

[0044] The center hole 16 is convenient for observing and painting the surface of the blade cavity 12 from the hub end or the blade end; after the paint is dried, the plug 14 of the plugging sand block 4 is directly inserted into the blade cavity 12 from the outer wall of the blade sand block 2 for plugging, which can effectively solve the problem of difficult painting of the blade cavity 12.

[0045] The steel wire 9 is fixed in a whole circle on the outer side of the plugging sand block 4. After the sand mold is assembled, it is placed in the sand box, and the surrounding sand is hardened. The use of steel wire 9 can prevent unnecessary movement of the plugging sand block 4 during sanding, which may cause defects such as flash and burr on the cast blade.

[0046] The number of positioning screws 7 is four, the top end of the positioning screw 7 fixes the four ends of the cross stiffener plate 8, and the center of the cross stiffener plate 8 longitudinally overlaps the center of the riser sand block 1. During the pouring process, the metal liquid fills the hub cavity and the blade cavity 12, which may cause lifting force on part of the hanging core 6, and the strength of the sand at the position of the open riser 13 may be reduced under the high-temperature metal liquid baking, which may have the risk of cracking or even breaking. The sand mold reinforced by this reinforcing rib scheme has a greatly reduced risk of cracking or breaking.

[0047] The present application is described by way of examples, and it is to be understood that various alterations and / or equivalents can be apparent to those skilled in the art without departing from the spirit and scope of the present application. In addition, it is to be understood that the features and embodiments described herein can be modified to adapt to specific situations and materials without departing from the spirit and scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application are to be included in the scope of the present application.

Claims

1. A sand mold for a complex-structure marine propeller, characterized by, The application relates to a sand block for a casting, which comprises a riser sand block (1), a blade sand block (2), a base sand block (3) and a blocking sand block (4); the base sand block (3) is provided with a protruding block (11), the blade sand block (2) is provided with a central hole (16), the lower side of the base sand block (3) and the blade sand block (2) are clamped, the protruding block (11) is sleeved into the central hole (16), and a lower hub-shaped cavity is formed between the outer wall of the protruding block (11) and the inner wall of the central hole (16); the upper side of the riser sand block (1) and the blade sand block (2) are clamped, the riser sand block (1) is integrally provided with a lifting core (6), an upper hub-shaped cavity is formed between the outer wall of the lifting core (6) and the inner wall of the blade sand block (2); a blade-shaped cavity (12) is arranged between the inner wall and the outer wall of the blade sand block (2), the blade-shaped cavity (12) penetrates through the inner wall and the outer wall of the blade sand block (2), the outer wall of the blade sand block (2) is provided with the blocking sand block (4); the lower side of the blade sand block (2) and the riser sand block (1) is provided with a clamping block (10), the upper side of the base sand block (3) and the blade sand block (2) is provided with a clamping groove (5), and the clamping groove (5) and the clamping block (10) are clamped; the blocking sand block (4) comprises a main plate (15) and a plug (14), one side of the main plate (15) is provided with the plug (14), the plug (14) can be inserted into the blade-shaped cavity (12) and realizes the outside closure of the blade-shaped cavity (12).

2. A sand mould for a complex-structured marine propeller according to claim 1, characterized in that The riser sand block (1) is provided with a top riser (13) on the top.

3. A sand mold for a complex-structure marine propeller according to claim 1, characterized in that, The clamping block (10) and the clamping groove (5) are annular.

4. A sand mould for a complex-structured marine propeller according to claim 3, characterized in that The clamping block (10) and the clamping groove (5) are trapezoidal in cross section.

5. A sand cast complex configuration marine propeller according to claim 1, wherein, The upper side of the base sand block (3) is fixed with a positioning screw rod (7), and the riser sand block (1) and the blade sand block (2) are provided with positioning holes at positions corresponding to the positioning screw rod (7).

6. A sand mould for a complex-structured marine propeller according to claim 5, characterized in that The top of the positioning screw rod (7) is fixed through a cross reinforcing plate (8).

7. A sand cast complex configuration marine propeller according to claim 1, wherein Steel wires (9) are used to fix the blocking sand block (4) in the circumferential direction.

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