A brake disc casting parting structure

Abstract

The utility model relates to a kind of brake disc casting parting structure, including upper sand mould and lower sand mould, upper sand mould is equipped with direct sprue, the joint of upper sand mould and lower sand mould is equipped with the circumferential setting curved surface parting surface, the middle part of curved surface parting surface is equipped with cavity, curved surface parting surface is equipped with sprue, direct sprue is communicated with cavity by sprue, cavity is used to form casting. By setting curved surface parting surface, the height of cavity is reduced, the distance between cavity and the top of upper sand mould is increased, so as to meet the production demand of higher casting, expand product production range, reduce the casting reject rate, the reject rate is reduced to 5% or less from 35%, save casting cost, improve casting efficiency. Curved surface parting process is adopted, the problem that cavity scattered sand is difficult to blow is solved, at the same time, static head is increased, the fluidity of metal liquid is enhanced, the filling capacity of metal liquid is improved, the defects such as pinhole, air hole and inclusion and insufficient pouring are reduced, and the quality of casting is improved.

Description

Technical Field

[0001] This utility model relates to the field of brake disc casting technology, specifically to a brake disc casting parting structure. Background Technology

[0002] Molding with a mold is a casting process mainly used in the metal casting industry. This method is often suitable for producing castings with complex shapes and high dimensional accuracy requirements. Molding with a mold uses a double-sided mold, with the upper and lower molds forming simultaneously during the molding process. To ensure the quality of the pouring, the mold cavity needs to be purged before pouring to ensure that there are no residual sand particles or other impurities inside.

[0003] When the workpiece to be cast is relatively tall, according to the existing casting process, if the casting is placed in the upper mold box, the mounting surface of the brake disc, i.e. the small end face, must be located at the top according to the casting mold release requirements. The bottom surface of the pouring cavity is very close to the parting line, so the purging effect of the cavity can be ensured and the residual sand particles can be easily blown away. However, because the height of the pouring gate is fixed, the height difference between the highest point of the casting and the pouring gate is small (small static pressure head). This will lead to a long pouring time and easily produce defects such as insufficient cold shut pouring. Therefore, products with too high a height cannot be produced. Even if it is forced to be produced, the scrap rate of the casting is very high, resulting in a large economic loss.

[0004] If the casting is placed in the lower mold box, according to the casting mold opening requirements, the small end face of the brake disc is located at the bottom. The static pressure between the pouring gate and the highest point of the casting is guaranteed, but this will result in a deeper lower cavity. The lowest point of the cavity is far from the parting line, making it difficult to blow out the residual sand and other residues in the lower cavity. Therefore, the produced castings are prone to defects such as sand holes and slag holes, which affect the quality of the castings. Utility Model Content

[0005] This utility model addresses the existing technical problems by providing a brake disc casting parting structure.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A brake disc casting parting structure includes an upper sand mold and a lower sand mold. The upper sand mold is provided with a sprue. The junction of the upper sand mold and the lower sand mold is provided with a circumferentially arranged curved parting surface. A cavity is provided in the middle of the curved parting surface. A sprue is provided at the curved parting surface. The sprue is connected to the cavity through the sprue. The cavity is used to form a casting.

[0007] Based on the above technical solution, the present invention can be further improved as follows:

[0008] Preferably, the curved parting surface includes a first plane, a transition slope, and a second plane arranged sequentially. The first plane is located at the outer edge and is flush with the parting line. The height of the first plane is greater than the height of the second plane. The lower end of the transition slope is inclined toward the cavity.

[0009] Preferably, the gating system includes a horizontal gating system and an inner gating system. One end of the horizontal gating system is connected to the sprue, and the other end is connected to the inner gating system. The inner gating system is connected to the cavity.

[0010] Preferably, the ingate is arranged along the parting surface of the curved surface.

[0011] Preferably, the height of the cavity is h1, and the distance between the top of the cavity and the top of the curved parting surface is h2, wherein h2 / h1 is 1 / 3 to 3 / 4.

[0012] Preferably, the inclination angle α of the transition slope is 30°-80°.

[0013] Preferably, a sand core is provided on the outer circumference of the cavity, and the gate of the ingate is located below the sand core. The ingate is connected to the cavity through the gate.

[0014] The beneficial effects of this invention are as follows: By setting a curved parting surface, the height of the mold cavity is reduced, and the distance between the mold cavity and the top of the upper sand mold is increased, thereby meeting the production needs of taller castings, expanding the product production range, and reducing the casting scrap rate from 35% to less than 5%, saving casting costs and improving casting efficiency. The curved parting structure achieves a relatively shallow depth in the lower sand mold, solving the problem of difficult sand blowing from the mold cavity. Simultaneously, it increases the static pressure head, enhances the fluidity of the molten metal, improves the filling capacity of the molten metal, reduces porosity and inclusions, and improves casting quality. Attached Figure Description

[0015] Figure 1 This is a top view of the present invention;

[0016] Figure 2 This utility model Figure 1 Schematic diagram of cross-section at point AA.

[0017] The attached diagram is labeled as follows: 1. Sprue; 2. Upper sand mold; 3. Horizontal sprue; 4. Sand core; 5. Casting; 6. Lower sand mold; 7. Ingate. Detailed Implementation

[0018] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0019] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. The terms "vertical," "upper," "lower," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model.

[0020] like Figure 1 and Figure 2 As shown, this utility model discloses a parting structure for brake disc casting, including an upper sand mold 2 and a lower sand mold 6. The upper sand mold 2 is provided with a vertically arranged sprue 1. At the junction of the upper sand mold 2 and the lower sand mold 6, there is a circumferentially arranged curved parting surface. A cavity is provided in the middle of the curved parting surface, and a gating is provided at the curved parting surface. The sprue 1 is connected to the cavity through the gating, and the cavity is used to form the casting 5. Specifically, the gating includes a horizontal sprue 3 and an inner sprue 7. One end of the horizontal sprue 3 is connected to the sprue 1, and the other end is connected to the inner sprue 7. The inner sprue 7 is connected to the cavity. The design of the curved parting surface allows for a relatively shallow depth in the lower sand mold 6, which is beneficial for thoroughly removing impurities during purging. Furthermore, the design of the horizontal sprue 3 allows the molten metal to flow smoothly from the sprue 1, reducing turbulence and scouring of the molten metal, which helps to avoid the formation of porosity and inclusions inside the casting 5. The ingate 7 precisely guides the molten metal into the mold cavity, ensuring the molding quality and precision of casting 5.

[0021] Furthermore, a sand core 4 is provided circumferentially on the outer side of the cavity, and the gate of the ingate 7 is located below the sand core 4. The ingate 7 communicates with the cavity through the gate. The sand core 4 is used to form the air duct of the casting 5 to meet the heat dissipation and ventilation requirements of the brake disc. During the casting process, the sand core 4, together with the upper sand mold 2 and the lower sand mold 6, constitute a complete mold. The molten metal flows smoothly into the cavity under the guidance of the gating system and finally solidifies to form the brake disc casting 5 with the air duct.

[0022] In this embodiment, the curved parting surface specifically includes a first plane, a transition slope, and a second plane arranged sequentially. The first plane is located at the outer edge and is flush with the parting line. The height of the first plane is greater than the height of the second plane. The lower end of the transition slope is inclined towards the cavity, allowing the casting to slide smoothly along the slope during demolding, reducing the force and time required for demolding and further improving production efficiency. The vertical height of the casting 5 is reduced to meet the casting requirements of taller castings 5 ​​and ensure the casting quality of the casting 5. Furthermore, during mold closing, the upper sand mold 2 and the lower sand mold 6 can fit together better, reducing leakage of molten metal during casting, ensuring the integrity and precision of the casting 5, and making demolding of the casting 5 smoother. This avoids casting damage or demolding difficulties caused by uneven parting surfaces, improving the quality of the casting 5.

[0023] Furthermore, the ingate 3 is set along the curved parting surface. The height difference between the first plane and the second plane, as well as the setting of the transition slope, allow the molten metal to flow smoothly into the cavity through the ingate 3, reducing flow resistance, avoiding casting defects caused by poor flow, and ensuring the quality of the casting 5.

[0024] The height of the mold cavity is h1, and the distance between the top of the mold cavity and the top of the curved parting surface is h2, where h2 / h1 is 1 / 3 to 3 / 4. By setting a reasonable h2 / h1 ratio, the casting structure is further optimized, ensuring that the distance between the mold cavity and the curved parting surface is moderate. This facilitates the smooth flow and filling of the molten metal, and also makes subsequent purging and cleaning easier, further improving the production efficiency and quality of the castings.

[0025] The inclination angle α of the transition slope is 30°-80°. This ensures that the molten metal has appropriate flow velocity and pressure when flowing through the ingate, preventing turbulence and scouring due to excessive flow velocity, and avoiding defects such as cold shuts and incomplete filling due to excessive flow velocity. It also promotes uniform distribution of the molten metal in the ingate 7, ensuring consistent filling quality and density throughout the casting, further improving the mechanical properties and service life of the casting.

[0026] In summary, this utility model, by adopting a curved parting structure and a reasonable gating system design, can meet the casting requirements of brake discs of different heights with and without ventilation channels, solve the problems existing in the current brake disc casting process, and improve the quality of castings and production efficiency.

[0027] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A brake disc casting parting structure, comprising an upper sand mold (2) and a lower sand mold (6), characterized in that, The upper sand mold (2) is provided with a sprue (1), and the upper sand mold (2) and the lower sand mold (6) are provided with a circumferentially arranged curved parting surface. The middle part of the curved parting surface is provided with a cavity, and the curved parting surface is provided with a gating. The sprue (1) is connected to the cavity through the gating. The cavity is used to form the casting (5).

2. The brake disc casting parting structure according to claim 1, characterized in that, The curved parting surface includes a first plane, a transition slope, and a second plane arranged sequentially. The first plane is located at the outer edge and is level with the parting line. The height of the first plane is greater than the height of the second plane. The lower end of the transition slope is inclined toward the cavity.

3. The brake disc casting parting structure according to claim 1 or 2, characterized in that, The gating system includes a horizontal gating system (3) and an inner gating system (7). One end of the horizontal gating system (3) is connected to the straight gating system (1), and the other end is connected to the inner gating system (7). The inner gating system (7) is connected to the cavity.

4. The brake disc casting parting structure according to claim 3, characterized in that, The ingate (7) is set along the parting surface of the curved surface.

5. The brake disc casting parting structure according to claim 1 or 2, characterized in that, The height of the cavity is h1, and the distance between the top of the cavity and the top of the curved parting surface is h2, wherein h2 / h1 is 1 / 3 to 3 / 4.

6. The brake disc casting parting structure according to claim 2, characterized in that, The inclination angle α of the transition slope is 30°-80°.

7. The brake disc casting parting structure according to claim 3, characterized in that, A sand core (4) is provided on the outer circumference of the cavity, and the gate of the ingate (7) is located below the sand core (4). The ingate (7) is connected to the cavity through the gate.

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