Resin sand mold for casting a reducer housing

Abstract

The application relates to a resin sand mold for casting a speed reducer shell, and belongs to the technical field of resin sand molds, which comprises an upper mold and a lower mold, a ring-shaped groove is symmetrically arranged on the surface of the lower mold, a ring-shaped core is arranged in the ring-shaped groove, the outer wall of the ring-shaped core is tightly combined with the outer ring surface of the ring-shaped groove, a ring-shaped cavity is formed between the inner wall of the ring-shaped core and the inner ring surface of the ring-shaped groove, a vertical sprue is arranged on the outer wall of the ring-shaped core, the vertical sprue is communicated with the ring-shaped cavity, a main sprue is arranged in the middle of the surface of the lower mold, and horizontal sprues are symmetrically arranged on the two sides of the main sprue. The application has the advantages of reasonable structure design, smooth liquid metal flow, adoption of resin sand core making, effective prevention of high-temperature liquid metal oxidation, no chemical reaction in the process of contacting with the casting mold and the high-temperature liquid metal, absorption and digestion of nitrogen-containing, sulfur-containing and carbon-containing gases, smooth surface of the speed reducer shell casting, and good forming effect.

Description

Technical Field

[0001] This application relates to the technical field of resin sand molds, and in particular to a resin sand mold for casting a speed reducer housing. Background Technology

[0002] Resin sand is widely used as molding (core) sand in modern foundry production. Molding (core) sands using resin as a binder mainly include hot-form coated resin sand, hot-box resin sand, cold-box resin sand, furan resin sand, and I-furan resin self-hardening sand. Resin sand has high strength after hardening, making it particularly suitable for machine molding and capable of producing complex, thin-walled castings.

[0003] For example Figure 1 The reducer housing 7 shown was previously cast using a conventional casting process, but the resulting surface was not smooth. Therefore, it was necessary to improve the process. Resin sand casting is now used, which produces a smooth surface and good quality. However, the mold needs to be redesigned to improve the molding quality of the product. Utility Model Content

[0004] The purpose of this application is to provide a resin sand mold for casting a speed reducer housing, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this application provides a resin sand mold for casting a speed reducer housing, employing the following technical solution: A resin sand mold for casting a speed reducer housing includes an upper mold and a lower mold. The lower mold surface has symmetrically formed annular grooves, and an annular core is disposed within each annular groove. The outer wall of the annular core is tightly fitted to the outer annular surface of the annular groove. An annular cavity is formed between the inner wall of the annular core and the inner annular surface of the annular groove. A vertical gating system is formed on the outer wall of the annular core, and the vertical gating system is connected to the annular cavity. A main gating system is formed in the middle of the lower mold surface, and horizontal gating systems are symmetrically arranged on both sides of the main gating system. An inner gating system connects the horizontal gating system and the vertical gating system. The upper mold has a sprue in the middle that is connected to the main sprue. The upper mold has an upper cavity corresponding to the position of the annular groove. A columnar core is provided in the upper cavity. The columnar core includes a columnar body and an arc-shaped transition part. A molding cavity is formed between the upper cavity and the columnar core.

[0006] A pouring cup is provided in the upper mold at the position corresponding to the sprue.

[0007] The upper mold has several riser grooves corresponding to the molding cavity, and risers are provided in the riser grooves.

[0008] Preferably, in order to make the liquid metal flow more evenly into the annular cavity, four vertical runners are provided on the periphery of the annular core.

[0009] Preferably, the upper mold is further provided with a sprue recess that communicates with the main runner and the transverse runner.

[0010] By employing the above technical solution, the main function of the gating well is to apply appropriate pressure to the molten metal, allowing it to quickly fill the mold cavity. This design helps improve casting efficiency and quality, ensuring that the casting fully fills the mold while reducing the generation of bubbles and other defects.

[0011] In summary, this application includes at least one of the following beneficial technical effects: the resin sand mold structure for casting the reducer housing is reasonably designed, allowing for smooth flow of liquid metal, and the use of resin sand core forming effectively prevents oxidation of the high-temperature liquid metal, without any chemical reaction during contact with the mold and the high-temperature liquid metal. Furthermore, it can absorb and digest gases containing nitrogen, sulfur, and carbon, resulting in a smooth surface and good forming effect for the reducer housing casting. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure used in the prior art to represent the housing of a speed reducer.

[0013] Figure 2 This is a structural diagram of the upper and lower molds in the split state in the embodiment of this application.

[0014] Figure 3 This is a schematic diagram illustrating the connection relationship between the annular core and the lower mold in the embodiments of this application.

[0015] Figure 4 This is a schematic diagram illustrating the structure of the upper mold in the embodiments of this application.

[0016] Figure 5 This is a cross-sectional structural diagram used to illustrate the upper mold in the embodiments of this application.

[0017] Figure 6 This is a schematic diagram illustrating the columnar core in the embodiments of this application.

[0018] Explanation of reference numerals in the attached drawings: 1. Upper mold; 11. Sprue; 12. Sprue cup; 13. Riser groove; 14. Sprue recess; 15. Upper cavity; 2. Lower mold; 21. Main sprue; 22. Horizontal sprue; 23. Ingate; 24. Annular groove; 3. Annular core; 31. Vertical sprue; 4. Annular cavity; 5. Columnar core; 51. Columnar body; 52. Arc-shaped transition section; 6. Molding cavity. Detailed Implementation

[0019] The following is in conjunction with the appendix Figure 2-6 This application will be described in further detail.

[0020] This application discloses a resin sand mold for casting a speed reducer housing, as shown in the embodiments below. Figure 2-6 The mold includes an upper mold 1 and a lower mold 2. The surface of the lower mold 2 is symmetrically provided with annular grooves 24. An annular core 3 is provided in the annular grooves 24. The outer wall of the annular core 3 is tightly fitted with the outer ring surface of the annular groove 24. An annular cavity 4 is formed between the inner wall of the annular core 3 and the inner ring surface of the annular groove. A vertical sprue 31 is provided on the outer wall of the annular core 3. The vertical sprue 31 is connected to the annular cavity 4. In order to uniformly inject liquid metal into the annular cavity 4, four vertical sprues 31 are provided on the periphery of the annular core 3. A main sprue 21 is provided in the middle of the surface of the lower mold 2. Horizontal sprues 22 are symmetrically provided on both sides of the main sprue 21. An inner sprue 23 is connected between the horizontal sprues 22 and the vertical sprues 31. The upper mold 1 has a sprue 11 in the middle that is connected to the main sprue 21. The upper mold 1 has an upper cavity 15 at the position corresponding to the annular groove 24. A columnar core 5 is provided in the upper cavity 15. The columnar core 5 includes a columnar body 51 and an arc-shaped transition part 52. A molding cavity 6 is formed between the upper cavity 15 and the columnar core 5.

[0021] Reference Figure 4-5 A sprue cup 12 is provided in the upper mold 1 at the position corresponding to the sprue 11, and several riser grooves 13 are provided in the upper mold 1 at the position corresponding to the molding cavity 6, with risers provided in the riser grooves 13.

[0022] Reference Figure 4-5 The upper mold 1 is also equipped with a sprue recess 14 that communicates with the main runner 21 and the runner 22. The main function of the sprue recess 14 is to apply appropriate pressure to the liquid metal, allowing the liquid metal to quickly fill the mold cavity. This design helps to improve casting efficiency and quality, ensures that the casting can fully fill the mold, and reduces the generation of bubbles and other defects.

[0023] The implementation principle of the resin sand mold for casting a reducer housing in this application embodiment is as follows: Liquid metal is poured from the pouring cup 12, flows through the sprue 11 into the main runner 21, then splits into two streams flowing into the side runners 22, and then through the ingate 23 and the vertical runner 31 into the annular cavity 4. The liquid metal gradually overflows the annular cavity 4 and enters the forming cavity 6, finally entering the riser. After this, the pouring of liquid metal is stopped, and the liquid metal is allowed to solidify. The mold structure is reasonably designed, and the use of resin sand cores can effectively prevent oxidation of the high-temperature liquid metal, and there is no chemical reaction during the contact between the mold and the high-temperature liquid metal. It can also absorb and digest gases containing nitrogen, sulfur, carbon, etc.

[0024] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A resin sand mold for casting a speed reducer housing, comprising an upper mold (1) and a lower mold (2), characterized in that: The lower mold (2) has symmetrically formed annular grooves (24) on its surface. An annular core (3) is provided in the annular groove (24). The outer wall of the annular core (3) is closely fitted with the outer ring surface of the annular groove (24). An annular cavity (4) is formed between the inner wall of the annular core (3) and the inner ring surface of the annular groove. A vertical runner (31) is provided on the outer wall of the annular core (3). The vertical runner (31) is connected to the annular cavity (4). A main runner (21) is provided in the middle of the surface of the lower mold (2). Horizontal runners (22) are symmetrically provided on both sides of the main runner (21). An inner runner (23) is connected between the horizontal runner (22) and the vertical runner (31). The upper mold (1) has a sprue (11) in the middle that is connected to the main sprue (21). The upper mold (1) has an upper cavity (15) at the position corresponding to the annular groove (24). A columnar core (5) is provided in the upper cavity (15). The columnar core (5) includes a columnar body (51) and an arc-shaped transition part (52). A molding cavity (6) is formed between the upper cavity (15) and the columnar core (5).

2. The resin sand mold for casting a reducer housing according to claim 1, characterized in that: A pouring cup (12) is provided in the upper mold (1) at the position corresponding to the sprue (11).

3. The resin sand mold for casting a reducer housing according to claim 1, characterized in that: The upper mold (1) has several riser grooves (13) at the positions corresponding to the forming cavity (6), and risers are provided in the riser grooves (13).

4. The resin sand mold for casting a reducer housing according to claim 1, characterized in that: The annular core (3) has four vertical runners (31) on its periphery.

5. The resin sand mold for casting a reducer housing according to claim 1, characterized in that: The upper mold (1) is also provided with a sprue recess (14) that is connected to the main sprue (21) and the transverse sprue (22).

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