Combined sand casting mold and casting

Abstract

The invention discloses a combined sand mold casting mold and a casting, the mold comprises a mold assembly box, the mold assembly box comprises a sand mold A, a sand mold B and a positioning block, the sand mold A is connected with the sand mold B, and the positioning block is arranged between the sand mold A and the sand mold B. According to the method, the same-furnace pouring can be carried out by arranging different types or models of die assembly box splicing combination, multiple schemes can be verified at the same time in the mode, the same-furnace verification pouring is carried out on alloy castings of the same brand, and the efficiency is improved. The mold closing box is arranged in a combined sand mold mode, a sand mold runner, an attached casting sample, a chilling block and a mold cavity are arranged in a left-right distinguishing mode, universality is high, operation is easy, and the mold closing box is not limited by the size of a sand box and casting and pouring equipment.

Description

Technical Field

[0001] The invention belongs to the technical field of casting molds, and in particular relates to a combined sand casting mold and a casting. Background Art

[0002] With the development of my country's aerospace industry, the number of multi-variety frame castings is increasing, the performance and internal quality requirements are getting higher and higher, and the development and delivery cycle is getting shorter and shorter. The use of traditional metal mold sand casting has the disadvantages of long development cycle and high mold production cost, which is not suitable for the production of small batches of multi-variety castings. At the same time, there are many disadvantages in using the same casting process scheme for multiple parts in one furnace. After the casting is poured, it needs to be cut, polished, sandblasted, machined and other processes before it can be X-ray and fluorescence inspection processes. When non-destructive testing finds defects in the casting, the casting process needs to be optimized, and then the casting is re-molded, which greatly prolongs the casting development cycle. In addition, there is a risk of mass scrapping of castings with the same scheme in one furnace, and the number of scrapped castings increases, and the development cost continues to increase.

[0003] Therefore, a casting mold is needed that can solve the problems of long development cycle, high manufacturing cost, uncontrollable product quality and low pass rate for various frame castings.

[0004] The patent document with announcement number CN113414351A discloses a 3D printing process for sand molds for tail-free counterweight production. The invention divides the sand molds for tail-free counterweight production into 3-5 small sand molds for 3D printing and molding respectively, and then assembles them together to save the amount of 3D printing sand. However, the invention does not disclose the method of setting a hollow structure inside the sand mold to reduce the quality of the sand mold and reduce the material consumption.

[0005] The patent document with the announcement number CN110523922A discloses a casting sand mold structure of a multi-way valve casting, including a cover plate core, a composite valve core and a bottom plate core, wherein the cover plate core is used to form a cavity structure of the outer contour of the top side of the casting, and the bottom plate core is used to form a cavity structure of the outer contour of the bottom side of the casting. The composite valve core is formed by 3D printing and is used to form all the cavity structures of the outer periphery between the top side and the bottom side of the casting and all the valve hole cores and flow channel cores inside the casting. The cover plate core, the composite valve core and the bottom plate core are combined to form a core package of the casting sand mold, and the outer periphery of the core package is provided with an upper outer mold and a lower outer mold, and the corresponding parts of the core package are provided with an inner gate and a riser channel connected to the cavity of the casting, and the upper outer mold and / or the lower outer mold are provided with a pouring system channel, a riser channel and a vent hole corresponding to the core package. However, this patent requires the preparation of structures such as outer molds and cover plates, which requires longer working hours and more raw materials. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides a combined sand casting mold and casting.

[0007] The present invention is achieved through the following technical solutions.

[0008] The present invention provides a combined sand casting mold, comprising a mold box, wherein the mold box comprises a sand mold A, a sand mold B and a positioning block, wherein the sand mold A is connected to the sand mold B, and the positioning block is arranged between the sand mold A and the sand mold B.

[0009] Preferably, the mold box can be prepared by 3D printing, and the sand mold A is provided with a positioning part A, a casting groove A, a casting block A, a runner gate A and a lifting hole, the casting block A is arranged in the casting groove A, the lifting hole is arranged on the outer wall of the sand mold A, and the runner gate A is arranged on the top of the casting groove A.

[0010] Preferably, a groove A is arranged inside the casting block A, the groove A is in an arc shape, a groove B is arranged inside the groove A, and grooves C are arranged on both sides of the casting block A.

[0011] Preferably, the sand mold B is provided with a positioning groove A, a casting groove B, a placement platform and a runner gate B, the placement platform is arranged in the casting groove B, and the runner gate B is arranged at the top of the casting groove B.

[0012] Preferably, the placement platform is in an arc shape, a plurality of placement grooves A are arranged on the placement platform, a stopper is arranged between adjacent placement grooves A, and a cooling block is arranged in the placement groove A.

[0013] Preferably, a groove D and an inclined surface A are provided in the casting groove B.

[0014] Preferably, the cooling block is arc-shaped and is made of metal.

[0015] A casting cast by the combined sand casting mold is characterized by comprising a connecting rod, a connecting block and a connecting plate, wherein the connecting rod is connected to the connecting plate via the connecting block.

[0016] Preferably, a positioning piece is provided on a side of the connecting rod away from the connecting block, an arc-shaped surface is provided on one side of the connecting block, and the connecting piece is arc-shaped.

[0017] Preferably, the arc-shaped surface is flush with the inner wall of the connecting piece.

[0018] The beneficial effects of the present invention are:

[0019] The present invention can perform the same furnace casting by setting different types or models of mold boxes for splicing and combination. This method can verify multiple schemes at the same time, and the same grade of alloy castings can be cast in the same furnace for verification, thereby improving efficiency. The mold box is a combined sand mold setting, in which the sand mold runner, the attached casting sample, the cold iron, and the left and right sides of the mold cavity are arranged separately, with strong versatility and easy operation, and is not limited by the size of the sand box and the casting and pouring equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the present invention;

[0021] Figure 2 It is a structural schematic diagram of the sand mold A of the present invention;

[0022] Figure 3 It is a structural schematic diagram of sand mold B of the present invention;

[0023] Figure 4 It is a schematic structural diagram of the casting of the present invention;

[0024] Figure 5 It is a schematic diagram of the casting structure of horizontal casting;

[0025] In the figure: 1-sand mold A, 11-positioning piece A, 12-casting groove A, 13-casting block A, 131-groove A, 132-groove B, 133-groove C, 14-runner A, 2-sand mold B, 21-positioning groove A, 22-casting groove B, 221-groove D, 222-inclined surface A, 23-placing platform, 231-placing groove A, 232-stopper, 233-cooling block, 24-runner B, 3-positioning block, 7-casting, 101-connecting rod, 102-connecting block, 103-connecting plate, 104-positioning piece, 105-arc surface, 201-lifting hole. DETAILED DESCRIPTION

[0026] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0027] Example:

[0028] like Figures 1 to 4 As shown, a combined sand casting mold includes a mold box, the mold box includes a sand mold A1, a sand mold B2 and a positioning block 3, the sand mold A1 and the sand mold B2 are connected, and the internal cavity after the sand mold A1 and the sand mold B2 are connected is used to generate a casting 7, the positioning block 3 is arranged between the sand mold A1 and the sand mold B2, the positioning block 3 is used to position the sand mold A1 and the sand mold B2 to ensure the dimensional accuracy of the casting, and the draft angle of the positioning block 3 is set to 15 degrees. A plurality of mold boxes can be set according to the casting needs, so as to realize the production process of casting multiple pieces in one furnace and improve the efficiency of producing different castings 7.

[0029] The mold box can be prepared by 3D printing. The sand mold A1 is provided with a positioning piece A11, a casting groove A12, a casting block A13, a runner gate A14 and a lifting hole 201. The casting block A13 is arranged in the casting groove A12, the lifting hole 201 is arranged on the outer wall of the sand mold A1, and the runner gate A14 is arranged on the top of the casting groove A12.

[0030] A groove A131 is arranged inside the casting block A13, and the groove A131 is in an arc shape. A groove B132 is arranged inside the groove A131, and grooves C133 are arranged on both sides of the casting block A13.

[0031] The sand mold B2 is provided with a positioning groove A21, a casting groove B22, a placement platform 23 and a runner B24, wherein the placement platform 23 is arranged in the casting groove B22, the runner B24 is arranged at the top of the casting groove B22, and the positioning member A11 is connected to the positioning groove A21 to play a positioning role. During casting, the casting raw materials are poured from the runner A14 and the runner B24.

[0032] The placement platform 23 is in an arc shape, and the shape of the placement platform 23 corresponds to the groove A131. The placement platform 23 is placed in the groove A131 for contact connection. A plurality of placement grooves A231 are set on the placement platform 23, and a stopper 232 is set between adjacent placement grooves A231. A cooling block 233 is set in the placement groove A231.

[0033] A groove D221 and an inclined surface A222 are set in the casting groove B22. The casting groove B22 is adapted to the shape of the casting block A13. The shape and position of the groove D221 correspond to the groove C133 for the flow of casting liquid. The casting block A13 is placed in the casting groove B22 and is in contact with and connected to the inclined surface A222.

[0034] The cooling block 233 is arc-shaped and made of metal. The cooling block 233 is used to cool the casting 7. A riser is provided on the casting 7 to compensate for the shrinkage of the casting and eliminate the defects of porosity and shrinkage cavities.

[0035] A casting cast by the combined sand casting mold includes a connecting rod 101, a connecting block 102, and a connecting piece 103, wherein the connecting rod 101 is connected to the connecting piece 103 through the connecting block 102. After preparation, the connecting rod 101 and the positioning piece 104 need to be removed, and the connecting piece 103 is a tile-like structure. The connecting block 102 and the connecting piece 103 are easily deformed during the filling and solidification process. The arrangement of the connecting rod 101, the positioning piece 104 and the corresponding runner can prevent the casting 7 from being deformed during solidification and heat treatment, and can also control the solidification sequence and shrinkage compensation of the structure of the casting 7.

[0036] A positioning member 104 is disposed on the side of the connecting rod 101 away from the connecting block 102 , an arc surface 105 is disposed on one side of the connecting block 102 , and the connecting piece 103 is arc-shaped. The arc surface 105 is flush with the inner wall of the connecting piece 103 .

[0037] This combined sand casting mold is a flexible combined sand mold structure. The mold box is a segmented sand core combined structure composed of sand mold A1 and sand mold B2. The overall volume of the sand mold is minimized while ensuring the process structure of the casting. Only the key parts are retained. The subsequent pouring plan is based on the actual situation. Multiple plans can be flexibly combined and multiple castings can be flexibly matched. The same brand of castings can be randomly combined, and different plans can also be randomly combined. It is highly flexible, and the trial and error opportunities can be increased in the research and development stage. The optimal plan can be found in a short time, and the number of castings can be flexibly and reasonably arranged to avoid the risk of overcapacity of castings and batch scrapping of castings.

[0038] The overall volume of the mold box is reduced. Compared with the traditional casting mold, the outer mold, cover plate and other sand mold structures are cancelled. The traditional one-furnace two-piece casting method can be changed to a one-furnace four-piece or more casting method. When one furnace and four-piece are operated, the four castings are of the same height. Compared with the existing technology that uses the upper and lower boxes in one furnace and two pieces, it has the advantage of a larger exhaust area. Each casting is connected to the outside of the mold, and the exhaust effect is better. The one-furnace four-piece solution can be 3D printed to produce mold boxes, without printing sand molds such as pallets and outer molds. 3D printing reduces the overall volume of the mold, significantly improves the casting yield, saves a lot of metal raw material costs, and greatly saves the use of auxiliary materials such as 3D printing raw sand, resin, and curing agent, avoiding waste of resources. In addition, the interior of the mold box adopts a hollow structure design. Through the structural settings such as grooves C133 and grooves D221, while ensuring the strength of the mold box, it not only reduces the weight of the mold box, reduces the difficulty of opening the box, but also saves the use of printing raw materials and reduces production costs.

[0039] The mold of the present invention can cast the casting 7 vertically, that is, the connecting piece 103 is arranged vertically, so that multiple connecting blocks 102 in a linear direction can be connected through the same connecting rod 101. Figure 5 As shown, if the casting direction in which the connecting piece 103 is arranged horizontally is adopted, more connecting rods 101 and positioning pieces 104 are required, resulting in a waste of raw materials. During the casting process, the casting liquid moves from bottom to top in the mold, and the first solidification positions of the horizontally and vertically arranged castings 7 are different, which will affect the performance of the castings. Because the mechanical properties of the connecting piece 103 solidified at different times are better than those of the case with similar solidification times, it is a better choice to select the connecting piece 103 to be arranged vertically.

Claims

1. A combined sand casting mold, characterized in that: The invention comprises a mold box, wherein the mold box comprises a sand mold A (1), a sand mold B (2) and a positioning block (3), wherein the sand mold A (1) and the sand mold B (2) are connected, and the positioning block (3) is arranged between the sand mold A (1) and the sand mold B (2).

2. A combined sand casting mold according to claim 1, characterized in that: The mold box can be prepared by 3D printing. The sand mold A (1) is provided with a positioning piece A (11), a casting groove A (12), a casting block A (13), a runner gate A (14) and a hanging hole (201). The casting block A (13) is arranged in the casting groove A (12), the hanging hole (201) is arranged on the outer wall of the sand mold A (1), and the runner gate A (14) is arranged on the top of the casting groove A (12).

3. A combined sand casting mold according to claim 2, characterized in that: A groove A (131) is arranged inside the casting block A (13), and the groove A (131) is in an arc shape. A groove B (132) is arranged inside the groove A (131), and grooves C (133) are arranged on both sides of the casting block A (13).

4. A combined sand casting mold according to claim 1, characterized in that: The sand mold B (2) is provided with a positioning groove A (21), a casting groove B (22), a placement platform (23) and a pouring gate B (24); the placement platform (23) is arranged in the casting groove B (22), and the pouring gate B (24) is arranged at the top of the casting groove B (22).

5. A combined sand casting mold according to claim 4, characterized in that: The placement platform (23) is in an arc shape, and a plurality of placement grooves A (231) are arranged on the placement platform (23), a stopper (232) is arranged between adjacent placement grooves A (231), and a cooling block (233) is arranged in the placement groove A (231).

6. A combined sand casting mold according to claim 4, characterized in that: A groove D (221) and an inclined surface A (222) are provided in the casting groove B (22).

7. A combined sand casting mold according to claim 5, characterized in that: The cooling block (233) is arc-shaped and is made of metal.

8. A casting cast by the combined sand casting mold according to any one of claims 1 to 7, characterized in that: The invention comprises a connecting rod (101), a connecting block (102) and a connecting sheet (103); the connecting rod (101) is connected to the connecting sheet (103) via the connecting block (102).

9. A casting according to claim 8, characterized in that: A positioning piece (104) is provided on the side of the connecting rod (101) away from the connecting block (102), an arc-shaped surface (105) is provided on one side of the connecting block (102), and the connecting piece (103) is arc-shaped.

10. A casting according to claim 9, characterized in that: The arc-shaped surface (105) is flush with the inner wall of the connecting piece (103).

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