Lower core cover structure for casting ventilation disc

Abstract

The utility model relates to the technical field of ventilation disc casting lower cores, in particular to a lower core cover structure for ventilation disc casting, which comprises a base plate, a first positioning groove is arranged on the base plate, a sealing positioning piece is arranged at the center of the first positioning groove, a through hole is further arranged on the first positioning groove, and the sealing positioning piece is arranged in the through hole. One end of the through hole is communicated with the cavity of the sand core, and the other end of the through hole is connected with a negative pressure suction mechanism. By the adoption of the lower core cover structure for casting the ventilation disc, a casting is not formed in the center of the sand core, the negative pressure through hole used for suction is formed in the range of the middle cavity of the ventilation disc sand core, standardization and generalization of the lower core cover can be achieved, the lower core cover structure is suitable for casting production of vertical lines of ventilation discs of different models, too many types of lower core covers are avoided, cost is reduced, and production efficiency is improved. The tool remodeling frequency is reduced, and the tool inventory and warehouse management difficulty is lowered; and in the core setting process of the manipulator, the first positioning groove is matched with the sealing positioning piece, so that core setting is facilitated, positioning is accurate, and sand core collision and core falling are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of lower cores for ventilated disc casting, in particular to a lower core cover structure for ventilated disc casting. Background Art

[0002] The ventilated disc is a brake component for automobiles. It has many ventilation mechanisms on the circumference that lead to the center of the circle. The centrifugal force generated by the car during driving can cause air convection, and the air passes through the ventilation mechanisms on the ventilated disc to achieve the purpose of heat dissipation. Ventilated discs are mostly made of gray cast iron and produced by casting vertical lines. When producing ventilated discs on the vertical molding line, it is necessary to use a robot and a lower core cover to lower the sand core into the mold cavity. A suction negative pressure port is set at the part of the lower core cover corresponding to the large outer circle of the sand core, that is, corresponding to the outside of the ventilation mechanism. By forming a negative pressure environment, the sand core is adsorbed on the lower core cover during the core setting process, thereby preventing the sand core from falling. However, the diameters of different types of sand cores are different, resulting in the inability to standardize the lower core cover.

[0003] The production of the lower core cover is troublesome, with a long process cycle and high cost. At the same time, the lower core covers used by different models of ventilation discs are of different models and sizes. If each model of ventilation disc is made with a matching lower core cover, there will be too many types of lower core covers, which will increase the cost, increase the number of tooling changes, and increase the difficulty of tooling inventory and warehouse management. At the same time, in the process of using a robot to lower the core, there are problems such as the sand core not being able to be lowered into place and the positioning being inaccurate, which will cause the sand core to collide and fall off. Utility Model Content

[0004] In order to solve the above technical problems existing in the prior art, the utility model provides a lower core cover structure for casting a ventilation disc.

[0005] The technical solution of the utility model to solve the above technical problems is as follows:

[0006] The utility model provides a lower core cover structure for ventilated disk casting, comprising a base plate, a first positioning groove being provided on the base plate, a sealing positioning piece being provided at the center of the first positioning groove, and a through hole being provided on the first positioning groove, one end of the through hole being connected to the cavity of the sand core, and the other end being connected to a negative pressure suction mechanism.

[0007] By adopting the lower core cover structure for ventilation disk casting provided by the utility model, the center part of the sand core is not used to form a casting, and the negative pressure through hole for suction is set within the inner diameter range of the middle cavity of the ventilation disk sand core, the standardization and universalization of the lower core cover can be achieved, which is suitable for the vertical line casting production of ventilation disks of different models and diameters, avoiding too many types of lower core covers, reducing costs, reducing the number of tooling changes, and reducing the difficulty of tooling inventory and warehouse management; at the same time, by setting a sealing positioning part, a closed space is formed between the sand core and the base plate, which is conducive to forming a negative pressure environment; in the process of core lowering by the robot, the first positioning groove cooperates with the sealing positioning part to facilitate core lowering and accurate positioning, avoiding sand core collision and core falling.

[0008] On the basis of the above technical solution, the present invention can also make the following technical improvements:

[0009] Furthermore, the sealing positioning member is a cylindrical structure, and the sealing positioning member is extended along a direction perpendicular to the substrate.

[0010] The beneficial effect of adopting the above-mentioned further technical solution is that the sealing positioning part extends into the middle through hole of the ventilation disk sand core to achieve sealing of the middle through hole of the ventilation disk sand core, ensuring the formation of a closed space between the sand core and the substrate, which is conducive to forming a negative pressure environment. At the same time, the sealing positioning part plays a positioning role for the sand core, and further ensures the precise positioning of the sand core during the core setting process.

[0011] Furthermore, the first end of the sealing positioning member is detachably connected to the base plate, and the second end is provided with a guide portion.

[0012] The beneficial effect of adopting the above-mentioned further technical solution is that it is easy to replace the sealing positioning parts. According to the different heights of the sand cores, sealing positioning parts of multiple specifications are designed, and the heights of each sealing positioning part are different to adapt to sand cores of different height models; during the core setting process, the guide part plays a guiding role, which facilitates the rapid positioning of the sand core.

[0013] Furthermore, the guide portion is a truncated cone structure.

[0014] The beneficial effect of adopting the above-mentioned further technical solution is that the end of the sealing positioning member in contact with the sand core has a draft angle, which plays a guiding role and facilitates the rapid positioning of the sand core.

[0015] Furthermore, a second positioning groove is provided at the center of the first positioning groove, and a positioning block is provided at the first end portion, and the positioning block is engaged with the second positioning groove.

[0016] The beneficial effect of adopting the above further technical solution is that the sealing positioning member is easily fixed by engaging the positioning block with the second positioning groove.

[0017] Furthermore, a limiting boss is provided at the connection between the positioning block and the sealing positioning member.

[0018] The beneficial effect of adopting the above-mentioned further technical solution is that, by providing the limiting boss, the sealing positioning member is further ensured to be in a fixed position, thereby avoiding deviation during the core setting process.

[0019] Furthermore, the sealing positioning member and the positioning block are both hollow, and the first end is connected to the base plate via a fastening screw.

[0020] The beneficial effect of adopting the above-mentioned further technical solution is that: the screw of the fastening screw is connected to the threaded hole opened on the substrate, and the head passes through the through hole of the positioning block and extends into the hollow structure of the sealing positioning member, thereby realizing a detachable connection between the first end of the sealing positioning member and the substrate.

[0021] Furthermore, there are multiple through holes, and multiple circular holes are arranged around the sealing positioning member.

[0022] The beneficial effect of adopting the above-mentioned further technical solution is: using the middle cavity part of the sand core to apply stable and uniform negative pressure, the negative pressure area is large, the sand core adsorption force is large, and sand cores with large volume, heavy weight and high height can be placed, ensuring that the sand core is stably adsorbed on the core cover, thereby ensuring the stability of the core placement process.

[0023] Compared with the prior art, the present invention has the following technical effects:

[0024] The utility model provides a lower core cover structure for ventilated disc casting. The center part of the sand core is not used to form a casting, and the negative pressure through holes for suction are evenly distributed within the inner diameter range of the middle cavity of the ventilated disc sand core, which can realize the standardization and generalization of the lower core cover and is suitable for the vertical line casting production of ventilated discs of different models and diameters, avoiding too many types of lower core covers, reducing costs, reducing the number of tooling changes, and reducing the difficulty of tooling inventory and warehouse management; and can lay sand cores that are large in volume, heavy in weight, and high in height, ensuring that the sand cores are stably adsorbed on the lower core cover, and ensuring the stability of the core laying process; the sealing positioning part and the base plate are detachably connected, and by designing sealing positioning parts of different height specifications, it can be applied to sand cores of different heights; in the process of core laying by the robot, the first positioning groove cooperates with the sealing positioning part to facilitate core laying and accurate positioning, avoiding sand core collision and core falling. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic structural diagram showing the lower core cover structure of an embodiment of the present utility model is shown;

[0026] Figure 2 Shows a schematic structural diagram of a sealing positioning member;

[0027] Figure 3A schematic structural diagram of a substrate is shown;

[0028] Figure 4 Showing a schematic diagram of the sand mold structure;

[0029] Figure 5 A top view of the sand mold is shown;

[0030] Figure 6 Show Figure 5 Sectional view along AA direction;

[0031] Reference numerals:

[0032] 1. Base plate; 2. First positioning groove; 3. Sealing positioning member; 31. Guide portion; 32. Positioning block; 33. Annular limiting boss; 4. Through hole; 5. Second positioning groove; 6. Threaded hole; 7. Sand mold; 8. Sand core; 9. Cavity; 10. Fastening screw. DETAILED DESCRIPTION

[0033] The following is an explanation of the implementation of the present invention by means of specific specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this utility model are limited to this implementation. On the contrary, the purpose of introducing the utility model in conjunction with the implementation is to cover other options or modifications that may be extended based on the claims of the present invention. In order to provide an in-depth understanding of the present invention, the following description will contain many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0034] See also Figure 1-6 , a lower core cover structure for ventilated disk casting, including a substrate 1, a first positioning groove 2 is provided on the substrate 1, a second positioning groove 5 is provided at the center of the first positioning groove 2, the first positioning groove 2 and the second positioning groove 5 are concentric circle structures, a sealing positioning member 3 is provided at the center of the first positioning groove 2 and the second positioning groove 5, and the sealing positioning member 3 extends in a direction perpendicular to the substrate 1. A plurality of through holes 4 are also provided on the first positioning groove 2, and a plurality of through holes 4 are arranged around the sealing positioning member 3, one end of each through hole 4 is connected to the cavity 9 of the sand core 8, and the other end is connected to the negative pressure suction mechanism, which is sucked by the negative pressure suction mechanism to form a negative pressure environment in the enclosed space between the sand core 8 and the substrate 1, so that the sand core 8 is stably adsorbed in the first positioning groove 2 of the substrate 1.

[0035] The first end of the sealing positioning member 3 is detachably connected to the substrate 1 through a fastening screw 10, and a positioning block 32 is provided at the first end. The positioning block 32 is engaged with the second positioning groove 2, and a threaded hole 6 is provided on the second positioning groove 2. The sealing positioning member 3 and the positioning block 32 are both hollow. First, screw the fastening screw 10 into the threaded hole 6, and then pass the sealing positioning member 3 through the head of the fastening screw 10 to complete the installation of the sealing positioning member 3.

[0036] Because different types of sand cores 8 have different heights, the sealing positioning member 3 can be designed with two or more specifications. By installing and removing the fastening screws 10, the sealing positioning member 3 can be quickly replaced.

[0037] A limiting boss 33 is provided at the connection between the positioning block 32 and the sealing positioning member 3 to ensure that the sealing positioning member 3 is in a fixed position and avoid deviation during the core setting process. The limiting boss 33 is a hollow cylindrical structure.

[0038] The second end of the sealing positioning member 3 is provided with a guide portion 31, and the guide portion 31 is a truncated cone structure. The end of the sealing positioning member 3 that contacts the sand core 8 has a draft angle, which plays a guiding role and facilitates the rapid positioning of the sand core 8. The middle section of the sealing positioning member 3 located between the first end and the second end is a cylindrical structure without an inclination, which plays a role in sealing and positioning the sand core 8.

[0039] The process of core setting using the lower core cover structure for ventilated disc casting provided by the utility model is as follows: a manipulator is used to place the sand core 8 on the first positioning groove 2 and the sealing positioning part 3, and the negative pressure suction mechanism is turned on. Under the action of negative pressure, the sand core 8 is stably adsorbed on the lower core cover. The lower core cover carries the sand core 8 into the molding chamber, and the sand core 8 is lowered into the sand mold 7. Then the negative pressure suction mechanism is closed, the sand core 8 remains in the sand mold 7, and the lower core cover is retracted, completing the core setting action.

[0040] The lower core cover structure for ventilation disk casting provided by the utility model utilizes the central part of the sand core 8 to form no casting, and evenly distributes the through holes 4 used for suction to form negative pressure within the inner diameter range of the middle cavity 9 of the ventilation disk sand core 8, which can realize the standardization and generalization of the lower core cover, and is suitable for the vertical line casting production of ventilation disks of different models and diameters, avoiding too many types of lower core covers, reducing costs, reducing the number of tooling changes, and reducing the difficulty of tooling inventory and warehouse management; and utilizing the middle weight-reducing part of the sand core 8 to add negative pressure, the negative pressure area is larger, and the adsorption force of the sand core 8 is increased, so that sand cores 8 with large volume, large weight and high height can be laid, ensuring that sand cores 8 of different models can be stably adsorbed on the lower core cover, ensuring the stability of the core laying process; the sealing positioning part 3 and the base plate 1 are detachably connected, and by designing sealing positioning parts 3 of different height specifications, it can be applied to sand cores 8 of different heights; in the process of core laying by the robot, the first positioning groove 2 cooperates with the sealing positioning part 3 to facilitate core laying, accurately position, and avoid the sand core 8 from bumping or falling off.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A lower core cover structure for ventilated disc casting, characterized in that: It includes a base plate, a first positioning groove is provided on the base plate, a sealing positioning piece is provided at the center of the first positioning groove, and a through hole is also opened on the first positioning groove, one end of the through hole is connected to the cavity of the sand core, and the other end is connected to the negative pressure suction mechanism.

2. The lower core cover structure for ventilated disc casting according to claim 1, characterized in that: The sealing positioning member is a cylindrical structure, and the sealing positioning member is extended along a direction perpendicular to the substrate.

3. The lower core cover structure for ventilated disc casting according to claim 2, characterized in that: The first end portion of the sealing positioning member is detachably connected to the base plate, and the second end portion is provided with a guide portion.

4. The lower core cover structure for ventilated disc casting according to claim 3, characterized in that: The guide portion is a truncated cone structure.

5. The lower core cover structure for ventilated disc casting according to claim 3, characterized in that: A second positioning groove is further provided at the center of the first positioning groove, and a positioning block is further provided at the first end portion, and the positioning block is engaged with the second positioning groove.

6. The lower core cover structure for ventilated disc casting according to claim 5, characterized in that: A limiting boss is provided at the connection between the positioning block and the sealing positioning member.

7. The lower core cover structure for ventilated disc casting according to claim 5, characterized in that: The sealing positioning member and the positioning block are both hollow, and the first end is connected to the base plate via a fastening screw.

8. The lower core cover structure for ventilated disc casting according to any one of claims 1 to 7, characterized in that: There are multiple through holes, and multiple circular holes are arranged around the sealing positioning member.

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