Brake disc coated sand core box mold

Abstract

The utility model discloses a kind of brake disc film-coated sand core box mould, including upper mould, the lower mould of being located below upper mould and core part flange;The utility model is focused on: the upper parting surface of upper mould is formed with an upper core, and the lower parting surface of lower mould is formed with a lower cavity corresponding to the upper core by concave downwards;Core part flange is located in lower cavity and forms a first cavity between the two, the outer end of the protruding tooth of core part flange is matched with the inner wall of lower cavity and its top surface is exposed outside lower parting surface;When upper mould and lower mould are closed, the inner cavity of core part flange is inserted into the upper core and a second cavity corresponding to a plurality of mounting holes is formed between the two, the second cavity is communicated with the first cavity and the two form a mold cavity for filling film-coated sand, the mold cavity is communicated with sand nozzle, and the outer end top surface of protruding tooth and the upper parting surface between the two have a gap or the two are attached. Through this structure design, the structural strength of sand core is improved, to prevent damage.

Description

Technical Field

[0001] This utility model relates to the field of casting mold technology, specifically to a brake disc coated sand core box mold. Background Technology

[0002] Existing brake disc coated sand core box molds include an upper mold and a lower mold located below the upper mold. The upper parting surface of the upper mold protrudes downward to form an upper core, and a sand injection nozzle is installed on one side of the upper core. The lower parting surface of the lower mold is recessed downward to form a lower cavity, which corresponds to the upper core. When the upper and lower molds are closed, a mold cavity for forming the sand core of the brake disc is formed between the upper core and the lower cavity. The mold cavity corresponds to and is connected to the sand injection nozzle. When making the sand core, coated sand is injected into the mold cavity through the sand injection nozzle. When the mold cavity is full of coated sand, the coated sand in the mold cavity is heated and cured to form the sand core. However, the sand core formed by the above-mentioned brake disc coated sand core box mold has too thin a wall thickness, making it easy to be damaged. Utility Model Content

[0003] To address the shortcomings of existing technologies, the present invention aims to provide a brake disc coated sand core box mold that improves the structural strength of the sand core by wrapping the core flange inside the sand core, thereby forming an integral sand core with the core flange.

[0004] To achieve the above objectives, the embodiments of this utility model adopt the following technical solutions:

[0005] A brake disc coated sand core box mold includes an upper mold, a lower mold located below the upper mold, and a core flange;

[0006] The upper parting surface of the upper mold protrudes downward to form an upper core. The upper mold is also provided with a plurality of mounting holes for mounting the sand injection nozzle. The plurality of mounting holes surround the outer side of the upper core.

[0007] The lower parting surface of the lower mold is recessed to form a lower cavity corresponding to the upper core;

[0008] The core flange is disposed in the lower cavity and a first cavity is formed between the two. The top of the core flange is provided with a plurality of protruding teeth that are distributed circumferentially and extend outward. The outer ends of the protruding teeth are engaged with the inner wall of the lower cavity and their top surfaces are exposed outside the lower parting surface.

[0009] When the upper mold and the lower mold are closed, the upper core is inserted into the inner cavity of the core flange and a second cavity corresponding to the plurality of mounting holes is formed between them. The second cavity is connected to the first cavity and the two form a mold cavity for filling with coated sand. The mold cavity is connected to the sand injection nozzle. There is a gap between the top surface of the outer end of the protruding tooth and the upper parting surface or the two are in contact.

[0010] Furthermore, the inner wall of the lower cavity is recessed outward to form a plurality of lower grooves distributed along its circumference. The lower grooves penetrate the lower parting surface upward. The upper parting surface is recessed upward to form an upper groove corresponding to each of the lower grooves. The outer end of a protruding tooth is in clearance fit with a lower groove and an upper groove.

[0011] Furthermore, the bottom wall of the lower cavity protrudes upward to form a lower core, the top surface of the lower core corresponds to the bottom surface of the upper core and there is a gap between them, the lower end inner wall of the core flange cavity surrounds the outer side of the lower core and a third cavity is formed between them, the third cavity is located between the first cavity and the second cavity and the three are connected, so that the third cavity forms the lower end of the second cavity.

[0012] Furthermore, the top surface of the lower core is downward and recessed along its radial direction to form a plurality of venting grooves, which are connected to the mold cavity.

[0013] Furthermore, an outer cavity is formed on the lower parting surface at the top of the lower cavity. The outer cavity surrounds the outer periphery of the lower cavity and its bottom wall protrudes upward to form a plurality of lower bosses. The top surface of the lower boss is provided with an exhaust hole communicating with the mold cavity. The upper parting surface protrudes to form an upper boss corresponding to each lower boss. There is a gap between the upper boss and the lower boss.

[0014] Furthermore, the outer walls of the upper mold and the lower mold are respectively provided with multiple upper heating holes and lower heating holes. The multiple upper heating holes and lower heating holes are located on the outside of the mold cavity and each of them is equipped with a heating tube. The core flange is a ductile iron flange.

[0015] Furthermore, it includes a lower ejector plate located below the lower mold, and the inner bottom wall of the mold cavity has a plurality of ejector pin holes extending downward through the bottom surface of the lower mold. Each ejector pin hole has an ejector pin that is slidably fitted inside it, and the lower end of the ejector pin passes downward through the lower mold and is connected to the lower ejector plate.

[0016] Furthermore, it includes a sand-shooting plate disposed above the upper mold. The top surface of the sand-shooting plate has a downwardly opening sand-shooting port that penetrates the sand-shooting plate, corresponding to each of the sand-shooting nozzles. The bottom surface of the sand-shooting plate has an upwardly opening positioning hole that surrounds the outer periphery of each sand-shooting port. The positioning hole is used to fill a sealing gasket.

[0017] The brake disc coated sand core box mold of this utility model has a first cavity formed by placing the core flange in the lower cavity and the two forming a first cavity. When the upper mold and the lower mold are closed, the upper core is inserted into the inner cavity of the core flange and a second cavity corresponding to multiple mounting holes is formed between the two. The second cavity is connected to the first cavity and the two form a mold cavity for filling coated sand. When making the sand core, the coated sand is injected into the mold cavity through the sand injection nozzle. After the coated sand in the mold cavity is heated and solidified, it covers the outside of the core flange to form an integral sand core, that is, the core flange is covered inside the sand core, thereby improving the structural strength of the sand core and preventing its damage. Attached Figure Description

[0018] Figure 1 This is a partial three-dimensional exploded view of the brake disc coated sand core box mold according to an embodiment of the present utility model;

[0019] Figure 2 for Figure 1 A three-dimensional diagram showing the insertion of the core flange;

[0020] Figure 3 for Figure 2 A magnified view of part A;

[0021] Figure 4 for Figure 1 A sectional view of a partial schematic diagram during mold closing;

[0022] Figure 5 for Figure 4 A magnified view of part B;

[0023] Figure 6 for Figure 1 Another perspective 3D illustration of the upper mold;

[0024] Figure 7 for Figure 1 A three-dimensional schematic diagram of the sand-shooting plate from another perspective. Detailed Implementation

[0025] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments:

[0026] like Figures 1 to 7 As shown, this utility model embodiment provides a brake disc coated sand core box mold for forming sand cores for heavy vehicle brake discs, including an upper mold 1, a lower mold 2 located below the upper mold 1, a core flange 3, a lower ejector plate 7, and a sand injection plate 6.

[0027] like Figure 2 , Figure 6As shown, the upper parting surface 10 of the upper mold 1 integrally protrudes downward to form an upper core 11. The upper mold 1 also has multiple mounting holes 12 for mounting a sand injection nozzle (not shown), which surround the outer side of the upper core 11. The lower parting surface 20 of the lower mold 2 is recessed downward to form a lower cavity 21 corresponding to the upper core 11 (e.g., ...). Figure 1 (As shown).

[0028] like Figure 1 , Figure 4 and Figure 5 As shown, the core flange 3 is disposed in the lower cavity 21, and a first cavity 4 is formed between the two. In this embodiment, the core flange 3 is a ductile iron flange. The top of the core flange 3 is provided with a plurality of protruding teeth 31 that are distributed circumferentially and extend integrally outward. The outer ends of the protruding teeth 31 cooperate with the inner wall of the lower cavity 21 so that the inner wall of the lower cavity 21 covers the outer ends of the protruding teeth 31 and its top surface is exposed outside the lower parting surface 20 (e.g., Figure 3 As shown), the outer end of the protruding tooth 31 is exposed outside the sand core after the sand core is formed. When the brake disc is cast by casting gray cast iron, the outer end of the protruding tooth 31 is fused with the gray cast iron brake disc, so that the core flange 3 is fused with the gray cast iron brake disc to form a bimetallic brake disc.

[0029] like Figure 4 , Figure 5 As shown, when the upper mold 1 and the lower mold 2 are closed, the upper core 11 is inserted into the inner cavity 32 of the core flange 3, and a second cavity 5 corresponding to the plurality of mounting holes 12 is formed between them. The second cavity 5 is connected to the first cavity 4, and the two form a mold cavity for filling with coated sand. The mold cavity is connected to the sand injection nozzle. The outer end top surface of the protrusion 31 and the upper parting surface 10 have a gap or are in contact. When making the sand core, the coated sand is injected into the mold cavity through the sand injection nozzle, and the mold cavity is filled with coated sand. The coated sand is heated and cured. After solidification, the coated sand is wrapped around the core flange 3 to form an integral sand core. That is, the core flange 3 is wrapped inside the sand core, thereby improving the structural strength of the sand core, preventing its damage, and improving the core making efficiency. When casting the brake disc, the sand core is placed into the cavity of the sand mold. Since the sand core is an integral structure, there is only one sand core in the inner cavity of the casting. This not only improves the core dropping speed, but also makes the inner cavity of the casting free of burrs and seams, thus reducing the amount of grinding work.

[0030] In this embodiment, because there are machining errors in the core flange 3 and the lower cavity 21, a gap is provided between the top surface of the outer end of the protruding tooth 31 and the upper parting surface 10. This gap can eliminate the machining error of the core flange 3, so that the upper mold 1 and the lower mold 2 can be closed smoothly. Of course, in other embodiments, when the machining accuracy of the core flange 3 and the lower cavity 21 is high, because the positioning accuracy of the core flange 3 is high in this case, this gap does not need to be provided, that is, the top surface of the outer end of the protruding tooth 31 fits against the upper parting surface 10.

[0031] Specifically, such as Figures 1 to 3 As shown, the inner wall of the lower cavity 21 is recessed outward to form multiple lower grooves 211 distributed circumferentially thereon. The lower grooves 211 extend upward through the lower parting surface 20, and the upper parting surface 10 is recessed upward to form an upper groove 13 corresponding to each lower groove 211 (e.g., Figure 6 As shown), the outer end of a protruding tooth 31 is fitted with a lower groove 211 and an upper groove 13 with a clearance. This clearance can eliminate machining errors and improve the positioning accuracy of the core flange 3, thereby enabling the upper mold 1 and the lower mold 2 to close smoothly.

[0032] like Figures 3 to 5 As shown, the bottom wall of the lower cavity 21 protrudes upward to form a lower core 22. The top surface of the lower core 22 corresponds to the bottom surface of the upper core 11, and there is a gap between them. The lower inner wall of the core flange cavity 32 surrounds the outer side of the lower core 22, and a third cavity 51 is formed between them. The third cavity 51 is located between the first cavity 4 and the second cavity 5, and the three are connected, so that the third cavity 51 forms the lower end of the second cavity 5. In order to ensure that the coated sand can fill the mold cavity smoothly, so that the sand core is dense and without defects, multiple venting grooves 221 are formed on the top surface of the lower core 22, facing downward and along its radial direction. The multiple venting grooves 221 are distributed along the circumference of the lower core 22 and connected to the mold cavity to discharge the gas in the mold cavity.

[0033] like Figure 2 , Figure 3 As shown, an outer cavity 212 is formed on the lower parting surface 20 at the top of the lower cavity 21. The outer cavity 212 surrounds the outer periphery of the lower cavity 21, and its bottom wall protrudes upward to form multiple lower bosses 213. The top surface of the lower bosses 213 has a vent hole 2131 communicating with the mold cavity; Figure 5 , Figure 6 As shown, the upper parting surface 10 protrudes to form an upper boss 14 corresponding to each lower boss 213. There is a gap between the upper boss 14 and the lower boss 213. This gap also eliminates the machining errors of the upper mold 1 and the lower mold 2, so as to achieve smooth mold closing.

[0034] like Figure 2 , Figure 4 As shown, in order to fully heat the coated sand in the mold cavity and enable the coated sand to solidify quickly, heating pipes are installed on the upper mold 1 and the lower mold 2. Specifically, multiple upper heating holes 16 and lower heating holes 23 are respectively opened on the outer side walls of the upper mold 1 and the lower mold 2. The multiple upper heating holes 16 and lower heating holes 23 are located on the outside of the mold cavity and each of them is equipped with a heating pipe.

[0035] like Figure 4 , Figure 5As shown, the lower ejector plate 7 is located below the lower mold 2. The inner bottom wall of the mold cavity has multiple ejector pin holes 24 that penetrate the bottom surface of the lower mold 2. Each ejector pin hole 24 has a sliding ejector pin 71. The lower end of the ejector pin 71 passes through the lower mold 2 and is connected to the lower ejector plate 7. When the sand core is demolded, the upper mold 1 separates from the lower mold 2, and the ejector pin 71 pushes the sand core upward, so that the sand core is removed from the lower mold 2.

[0036] like Figure 4 , Figure 6 As shown, the sand-shooting plate 6 is located above the upper mold 1. The top surface of the sand-shooting plate 6 has a sand-shooting port 61 that penetrates the sand-shooting plate 6 downwards corresponding to each sand-shooting nozzle. The bottom surface of the sand-shooting plate 6 has a positioning hole 62 that surrounds the outer periphery of each sand-shooting port 61. The positioning hole 62 is used to fill the sealing gasket (not shown). The sealing gasket forms a sealing structure, which can ensure that the sand-shooting plate 6 is seamless during the sand-shooting process and prevent the coated sand from running out of the mold cavity.

[0037] The brake disc coated sand core box mold of this utility model has a first cavity formed by placing the core flange in the lower cavity and the two forming a first cavity. When the upper mold and the lower mold are closed, the upper core is inserted into the inner cavity of the core flange and a second cavity corresponding to multiple mounting holes is formed between the two. The second cavity is connected to the first cavity and the two form a mold cavity for filling coated sand. When making the sand core, the coated sand is injected into the mold cavity through the sand injection nozzle. After the coated sand in the mold cavity is heated and solidified, it covers the outside of the core flange to form an integral sand core, that is, the core flange is covered inside the sand core, thereby improving the structural strength of the sand core and preventing its damage.

[0038] 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 coated sand core box mold, characterized in that, It includes an upper mold, a lower mold located below the upper mold, and a core flange; The upper parting surface of the upper mold protrudes downward to form an upper core. The upper mold is also provided with a plurality of mounting holes for mounting the sand injection nozzle. The plurality of mounting holes surround the outer side of the upper core. The lower parting surface of the lower mold is recessed to form a lower cavity corresponding to the upper core; The core flange is disposed in the lower cavity and a first cavity is formed between the two. The top of the core flange is provided with a plurality of protruding teeth that are distributed circumferentially and extend outward. The outer ends of the protruding teeth are engaged with the inner wall of the lower cavity and their top surfaces are exposed outside the lower parting surface. When the upper mold and the lower mold are closed, the upper core is inserted into the inner cavity of the core flange and a second cavity corresponding to the plurality of mounting holes is formed between them. The second cavity is connected to the first cavity and the two form a mold cavity for filling with coated sand. The mold cavity is connected to the sand injection nozzle. There is a gap between the top surface of the outer end of the protruding tooth and the upper parting surface or the two are in contact.

2. The brake disc coated sand core box mold as described in claim 1, characterized in that, The inner wall of the lower cavity is recessed outward to form a plurality of lower grooves distributed along its circumference. The lower grooves penetrate the lower parting surface upward. The upper parting surface is recessed upward to form an upper groove corresponding to each of the lower grooves. The outer end of a protruding tooth is in clearance fit with a lower groove and an upper groove.

3. The brake disc coated sand core box mold as described in claim 1, characterized in that, The bottom wall of the lower cavity protrudes upward to form a lower core. The top surface of the lower core corresponds to the bottom surface of the upper core and there is a gap between them. The lower inner wall of the core flange cavity surrounds the outer side of the lower core and forms a third cavity between them. The third cavity is located between the first cavity and the second cavity and the three are connected, so that the third cavity forms the lower end of the second cavity.

4. The brake disc coated sand core box mold as described in claim 3, characterized in that, The top surface of the lower core is downward and recessed along its radial direction to form a plurality of venting grooves, which are connected to the mold cavity.

5. The brake disc coated sand core box mold as described in claim 1, characterized in that, The top of the lower cavity forms an outer cavity on the lower parting surface. The outer cavity surrounds the outer periphery of the lower cavity and its bottom wall protrudes upward to form multiple lower bosses. The top surface of each lower boss has a vent hole communicating with the mold cavity. The upper parting surface protrudes to form an upper boss corresponding to each lower boss. There is a gap between the upper boss and the lower boss.

6. The brake disc coated sand core box mold as described in claim 1, characterized in that, The outer walls of the upper mold and the lower mold are respectively provided with multiple upper heating holes and lower heating holes. The multiple upper heating holes and lower heating holes are located on the outside of the mold cavity and each of them is equipped with a heating tube. The core flange is a ductile iron flange.

7. The brake disc coated sand core box mold as described in claim 1, characterized in that, The mold cavity includes a lower ejector plate located below the lower mold. The inner bottom wall of the mold cavity has multiple ejector pin holes that penetrate the bottom surface of the lower mold. Each ejector pin hole contains a ejector pin that slides through it. The lower end of the ejector pin passes through the lower mold and is connected to the lower ejector plate.

8. The brake disc coated sand core box mold as described in claim 1, characterized in that, The device includes a sand-shooting plate located above the upper mold. The top surface of the sand-shooting plate has a downward-facing sand-shooting port that penetrates the sand-shooting plate, and the bottom surface of the sand-shooting plate has an upward-facing positioning hole surrounding the outer periphery of the sand-shooting port, which is used to fill a sealing gasket.

Images