Brake disc wet sand mold

Abstract

The utility model discloses a brake disc tide mould sand mould, including lower mould and upper mould, the lower parting plane of lower mould is concave down and forms lower cavity and the straight sprue nest and lower cross gate of being located lower cavity outside, and lower cross gate is connected with straight sprue nest, the upper parting plane of upper mould is convex and forms upper core and the upper straight sprue, upper cross gate, exhaust needle and outer exhaust fin of being located upper core outside, and upper core, upper straight sprue, upper cross gate correspond with lower cavity, straight sprue nest, lower cross gate respectively, the top surface of upper core is convex and forms upper exhaust column and excess core, and excess core is annular and surrounds the outside of upper exhaust column, and the top surface of excess core is convex and forms inner exhaust fin, and inner exhaust fin is connected with upper exhaust column, the inner end of outer exhaust fin, outer end is connected with upper core, exhaust needle respectively. Through this structure design, thereby prevent the upper disc surface of brake disc and appear air hole, further improve the yield of brake disc.

Description

Technical Field

[0001] This utility model relates to the field of casting mold technology, specifically to a brake disc wet-molding sand mold. Background Technology

[0002] Brake disc wet-mold sand molds are used to form sand molds, which are then used to cast brake discs (castings). Existing brake disc wet-mold sand molds include an upper mold and a lower mold. The lower mold has a lower cavity formed on its lower parting surface, along with a sprue recess and a lower runner located outside the lower cavity. The lower runner connects to the sprue recess. The upper mold has an upper core and an upper sprue formed on its lower parting surface, corresponding to the lower cavity and sprue recess, respectively. However, when the brake disc is cast using the sand mold formed by the aforementioned brake disc wet-mold sand mold, the upper surface of the brake disc is prone to porosity defects, leading to poor casting quality. Utility Model Content

[0003] To address the shortcomings of existing technologies, the present invention aims to provide a brake disc damping sand mold that guides the flow of gas generated during casting to the residual cavity corresponding to the residual core in the sand mold by setting an annular residual core surrounding the outer side of the upper exhaust column, thereby preventing air holes from appearing on the upper surface of the brake disc.

[0004] To achieve the above objectives, the embodiments of this utility model adopt the following technical solutions: Brake disc wet molding sand mold, including a lower mold and an upper mold corresponding to the lower mold; The lower parting surface of the lower mold is recessed to form a lower cavity and a sprue recess and a lower runner located outside the lower cavity. The lower runner is connected to the sprue recess. The upper parting surface of the upper mold protrudes upward to form an upper core and an upper sprue, an upper runner, an venting pin, and an outer venting plate located outside the upper core. The upper core, upper sprue, and upper runner correspond to the lower cavity, sprue recess, and lower runner, respectively. The top surface of the upper core protrudes upward to form an upper venting column and a reserve core. The reserve core is annular and surrounds the outer side of the upper venting column. The top surface of the reserve core protrudes upward to form an inner venting plate, which is connected to the upper venting column. The inner and outer ends of the outer venting plate are connected to the upper core and the venting pin, respectively.

[0005] Furthermore, the thickness of the internal exhaust vent is T, where T = 2~4 mm, and the width of the internal exhaust vent is W, where W = 5.5~6.5 mm.

[0006] Furthermore, T=2.5mm, W=6mm.

[0007] Furthermore, the upper exhaust column and the allowance core are both located in the middle of the top surface of the upper core. There are multiple inner exhaust plates, which are evenly distributed. The inner end and outer end of each inner exhaust plate extend to the outer peripheral wall of the upper exhaust column and the outer edge of the allowance core, respectively.

[0008] Furthermore, there are two lower cavities, the sprue recess and the lower runner are located between the two lower cavities, the lower runner has two sections, the two sections of the lower runner are located on opposite sides of the sprue recess, there are two upper cores, one upper core corresponds to one lower cavity, the upper runner has two sections, one upper runner corresponds to one lower runner.

[0009] Furthermore, each of the lower horizontal runners is provided with a lower filter, and the upper parting surface protrudes upward to form an upper filter corresponding to each of the lower filters.

[0010] Furthermore, the lower mold integrally protrudes upward on its lower parting surface to form a module and a positioning protrusion, the top surface of the module is recessed downward to form a lower cavity, the bottom wall of the lower cavity integrally protrudes upward to form a lower exhaust column, and the positioning protrusion is located on the outside of the module and connected to the outer peripheral wall of the module.

[0011] This invention relates to a brake disc wet-molding sand mold. By incorporating a ring-shaped allowance core surrounding the outer side of the upper exhaust column, the mold allows gas generated during casting to flow into the allowance cavity corresponding to the allowance core. This allowance cavity forms the allowance portion of the casting, preventing pores from forming on the upper surface of the disc. Upon completion of casting, the allowance portion is removed through machining, thus preventing pores on the upper surface of the brake disc and further improving the yield rate. This invention's brake disc wet-molding sand mold is characterized by its simple structure and ease of machining. Attached Figure Description

[0012] Figure 1 This is a three-dimensional schematic diagram of the upper mold of the brake disc moisture-molding sand mold according to an embodiment of the present utility model; Figure 2 for Figure 1 A magnified view of part A; Figure 3 This is a three-dimensional schematic diagram of the lower mold of the brake disc damping sand mold according to an embodiment of this utility model. Detailed Implementation

[0013] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments: like Figures 1 to 3As shown, this utility model embodiment provides a brake disc wet-molding sand mold for forming a sand mold (not shown), which is used to cast a casting (brake disc). The brake disc wet-molding sand mold includes a lower mold 1 and an upper mold 2 corresponding to the lower mold 1.

[0014] The lower mold 1 is used to form the lower shell shape of the sand mold (not shown), and its lower parting surface 11 is recessed downward to form a lower cavity 12 and a sprue recess 13 and a lower runner 14 located outside the lower cavity 12. There are two lower cavities 12, which are arranged side by side. The sprue recess 13 and the lower runner 14 are located between the two lower cavities 12. The lower runner 14 is connected to the sprue recess 13, and the lower runner 14 has two sections. The two sections of the lower runner 14 are located on opposite sides of the sprue recess 13, and the two sections extend in opposite directions along the radial direction of the lower cavity 12. Specifically, the lower mold 1 integrally protrudes upward from its lower parting surface 11 to form a module 15 and a positioning protrusion 16. The top surface of the module 15 is recessed downward to form a lower cavity 12. The bottom wall of the lower cavity 12 integrally protrudes upward to form a lower exhaust column 121 for venting. The positioning protrusion 16 is located outside the module 15 and connected to the outer peripheral wall of the module 15. By setting the positioning protrusion 16, the core of the sand mold can be positioned to prevent the core from moving.

[0015] The upper mold 2 is used to form the upper shell of the sand mold (not shown), and its upper parting surface 21 protrudes upward to form the upper core 22 and the upper sprue 23, upper runner 24, venting pin 27 and outer venting plate 25 located outside the upper core 22. The upper core 22, upper sprue 23, and upper runner 24 correspond to the lower cavity 12, sprue recess 13, and lower runner 14, respectively. There are two upper cores 22, one of which corresponds to the lower cavity 12. The top surface of the upper core 22 protrudes upward to form the upper venting column 221 and the allowance core 222. The allowance core 222 is annular and surrounds the outside of the upper venting column 221. The allowance core 222 is used to form the allowance cavity of the sand mold, and its top surface protrudes upward to form the inner venting plate 2221. The inner venting plate 2221 is connected to the upper venting column 221 to achieve venting. The allowance cavity is used to form the allowance part of the casting. The upper runner 24 has two sections, one corresponding to the lower runner 14. In the vertical direction, the projections of the two upper runners 24 coincide with the projections of the two lower runners 14 at their far ends, thus connecting the upper and lower runners of the sand mold. The inner and outer ends of the external venting plate 25 are connected to the upper core 22 and the venting pin 27, respectively, to expel gas and further prevent porosity in the casting.

[0016] By setting a ring-shaped allowance core 222 surrounding the outer side of the upper exhaust column 221, when the brake disc is cast, the gas generated during the casting process can flow completely into the allowance cavity corresponding to the allowance core 222 in the sand mold. The allowance cavity forms the allowance part of the casting, that is, the casting forms pores in the allowance part but not on the upper plate surface. When the casting is completed, the allowance part of the casting is removed by machining, thereby preventing pores from appearing on the upper plate surface of the brake disc, further improving the yield of the brake disc, and the structure is simple and easy to process.

[0017] When there is sufficient machining allowance in the brake disc, the allowance should be made as thin and narrow as possible to reduce machining difficulty. Specifically, the thickness of the inner exhaust plate 2221 is T, where T = 2~4mm, and the width of the inner exhaust plate 2221 is W, where W = 5.5~6.5mm. In this embodiment, T = 2.5mm and W = 6mm. The specific dimensions of the inner exhaust plate 2221 can be selected within the above range according to actual needs.

[0018] To further prevent air hole defects in the brake disc, more specifically, the upper exhaust column 221 and the allowance core 222 are both located in the middle of the top surface of the upper core 22. There are multiple inner exhaust plates 2221, which are evenly distributed. The inner end and outer end of each inner exhaust plate 2221 extend to the outer peripheral wall of the upper exhaust column 221 and the outer edge of the allowance core 222, respectively.

[0019] In this embodiment, each lower horizontal runner 14 is provided with a lower filter 141, and the upper parting surface 21 protrudes upward to form an upper filter 26 corresponding to each lower filter 141. The filter can filter impurities in the molten iron and further improve the quality of the casting.

[0020] This invention relates to a brake disc wet-molding sand mold. By incorporating a ring-shaped allowance core surrounding the outer side of the upper exhaust column, the mold allows gas generated during casting to flow into the allowance cavity corresponding to the allowance core. This allowance cavity forms the allowance portion of the casting, preventing pores from forming on the upper surface of the disc. Upon completion of casting, the allowance portion is removed through machining, thus preventing pores on the upper surface of the brake disc and further improving the yield rate. This invention's brake disc wet-molding sand mold is characterized by its simple structure and ease of machining.

[0021] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A brake disc damping sand mold, characterized in that, Includes a lower mold and an upper mold corresponding to the lower mold; The lower parting surface of the lower mold is recessed to form a lower cavity and a sprue recess and a lower runner located outside the lower cavity. The lower runner is connected to the sprue recess. The upper parting surface of the upper mold protrudes upward to form an upper core and an upper sprue, an upper runner, an venting pin, and an outer venting plate located outside the upper core. The upper core, upper sprue, and upper runner correspond to the lower cavity, sprue recess, and lower runner, respectively. The top surface of the upper core protrudes upward to form an upper venting column and a reserve core. The reserve core is annular and surrounds the outer side of the upper venting column. The top surface of the reserve core protrudes upward to form an inner venting plate, which is connected to the upper venting column. The inner and outer ends of the outer venting plate are connected to the upper core and the venting pin, respectively.

2. The brake disc damping sand mold as described in claim 1, characterized in that, The thickness of the internal exhaust vent is T, where T = 2~4 mm, and the width of the internal exhaust vent is W, where W = 5.5~6.5 mm.

3. The brake disc damping sand mold as described in claim 2, characterized in that, T=2.5mm, W=6mm.

4. The brake disc damping sand mold as described in claim 1, characterized in that, The upper exhaust column and the allowance core are both located in the middle of the top surface of the upper core. There are multiple inner exhaust plates, which are evenly distributed. The inner end and outer end of each inner exhaust plate extend to the outer peripheral wall of the upper exhaust column and the outer edge of the allowance core, respectively.

5. The brake disc damping sand mold as described in claim 1, characterized in that, There are two lower cavities. The sprue recess and the lower runner are located between the two lower cavities. The lower runner has two sections, which are located on opposite sides of the sprue recess. There are two upper cores, one of which corresponds to one lower cavity. The upper runner has two sections, one of which corresponds to one lower runner.

6. The brake disc damping sand mold as described in claim 5, characterized in that, Each of the lower horizontal runners is provided with a lower filter, and the upper parting surface protrudes upward to form an upper filter corresponding to each of the lower filters.

7. The brake disc damping sand mold as described in claim 1, characterized in that, The lower mold integrally protrudes upward on its lower parting surface to form a module and a positioning protrusion. The top surface of the module is recessed downward to form a lower cavity. The bottom wall of the lower cavity integrally protrudes upward to form a lower exhaust column. The positioning protrusion is located on the outside of the module and is connected to the outer peripheral wall of the module.

Images