Core setting cover structure for ventilation disc casting, manual core setting method and casting system

Abstract

The invention relates to the technical field of ventilation disc casting core setting, in particular to a core setting cover structure for ventilation disc casting, a manual core setting method and a casting system. The lower core cover structure comprises a base plate, three positioning supporting pieces are arranged on the base plate and located on the same circumference, and the side walls, away from the positioning circle center, of the three positioning supporting pieces are used for positioning and supporting the inner side wall of a sand core. The three positioning supporting pieces on the same circumference are adopted for positioning and supporting the sand core, the contact area is reduced, a positioning circle center is determined by the three positioning supporting pieces, the height of the positioning circle center can be changed by changing the height of the positioning supporting pieces, the height of the positioning circle center is designed to be 0.3-0.5 mm lower than the theoretical position, and in the manual core setting process, the positioning accuracy is greatly improved. And the sand core can upwards float for a certain small displacement, so that the mutual interference effect between the sand core and the inner wall of the sand mold is reduced, and the sand core is prevented from being damaged.

Description

Technical Field

[0001] The invention relates to the technical field of lower cores for ventilated disc casting, and in particular to a lower core cover structure for ventilated disc casting, an artificial lower core method and a casting system. Background Art

[0002] The ventilation disc is a kind of automobile brake component. It has many ventilation mechanisms on the circumference leading to the center of the circle. The centrifugal force generated by the car during driving can make the air convect. The air passes through the ventilation mechanism on the ventilation disc to achieve the purpose of heat dissipation. The ventilation disc is mostly made of gray cast iron and produced by casting vertical lines. When the ventilation disc is produced on the vertical molding line, it is necessary to manually use a lower core cover to lower the sand core into the sand mold. The existing lower core cover uses a supporting truncated table to support the middle cavity of the sand core. In the actual core lowering process, it is not easy to accurately find the position of the center of the circle manually, that is, the center of the lower core cover and the center of the model are difficult to achieve accurate alignment. There is a deviation between the two. It is difficult to manually lower the core, which causes interference between the sand core and the inner wall of the sand mold, making it difficult for manual core lowering to succeed. Even if the core is successfully lowered, it will cause the sand core to be damaged, resulting in core drop and broken core, and the core lowering effect is poor, which seriously affects the quality of the finished casting. In addition, the existing lower core cover is mostly an integrated aluminum alloy structure, and a complete set of lower core cover structures needs to be processed with an integral mold plate. The manufacturing process is cumbersome, the process cycle is long, and the raw material cost is high. Summary of the invention

[0003] In order to solve the above technical problems existing in the prior art, the present invention provides a lower core cover structure for ventilated disc casting, an artificial core setting method and a casting system.

[0004] The technical solution of the present invention to solve the above technical problems is as follows:

[0005] The first aspect of the present invention is to provide a lower core cover structure for ventilated disk casting, comprising a base plate, on which three positioning supports are arranged, and the three positioning supports are on the same circumference, and the side walls of the three positioning supports away from the center of the positioning circle are used to position and support the inner side walls of the sand core.

[0006] The lower core cover structure for ventilated disk casting provided by the present invention adopts three positioning supports on the same circumference to replace the supporting frustum, thereby reducing the contact area, and the three positioning supports can determine a positioning center. The position of the center of the sand core can be located by positioning the arc surface processed by the positioning supports, and the height of the designed positioning center is 0.3-0.5mm lower than the theoretical position. During the manual core setting process, the sand core can float upward for a certain distance, thereby reducing the mutual interference between the sand core and the inner wall of the sand mold and avoiding damage to the sand core. During the manual core setting process, there is no need to accurately judge the position of the center of the circle, making manual core setting more convenient and easy.

[0007] On the basis of the above technical solution, the present invention can also make the following improvements:

[0008] Furthermore, a first groove is formed on the substrate, and the three positioning support members are arranged in the first groove.

[0009] The beneficial effect of adopting the above further technical solution is that the side wall of the hollow inner circle of the sand core is supported on the positioning support, and the outer circle is engaged in the first groove, thereby preventing the sand core from moving on the lower core cover and ensuring the stability of the sand core placement.

[0010] Furthermore, a through hole is provided on the substrate, and the through hole is provided on a side of the positioning support member away from the center of the positioning circle. One end of the through hole is connected to the negative pressure suction mechanism, and the other end is connected to the sand core.

[0011] The beneficial effect of adopting the above further technical solution is that during the core lowering process, the sand core is stably adsorbed on the core lowering cover by negative pressure suction, thereby preventing the sand core from falling or shifting.

[0012] Furthermore, there is at least one through hole, a second groove is formed on the substrate, and at least one through hole is disposed in the second groove.

[0013] The beneficial effect of adopting the above-mentioned further technical solution is that the through hole is set at the supporting part of the sand core, and through the setting of the second groove, a certain gap space is created between the through hole and the supporting part of the sand core, which is convenient for suction to form a negative pressure environment, so that the sand core can be stably adsorbed on the lower core cover to prevent the sand core from falling or shifting.

[0014] Furthermore, the positioning support is detachably connected to the base plate.

[0015] The beneficial effect of adopting the above-mentioned further technical scheme is that: the positioning support member and the base plate adopt a split structure, so that the positioning support member and the base plate can be processed and formed separately during the production and processing of the lower core cover, thereby saving the processing time of the base plate and saving raw materials; at the same time, the positioning support member and the base plate can be made of different materials, among which the base plate is made of aluminum alloy material, and the positioning support member is made of 45 steel with good wear resistance. During the core lowering process, the wear of the positioning support member is avoided. Even if wear and damage occur during a long core lowering process, the detachable connection method also facilitates the disassembly and replacement of the positioning support member.

[0016] Furthermore, the positioning support is hollow, a threaded hole is formed on the first groove, and the positioning support is connected to the base plate by bolts.

[0017] The beneficial effect of adopting the above further technical solution is that it is easy to realize the detachable connection between the positioning support and the base plate.

[0018] Furthermore, the positioning support is a cylindrical structure, and the side wall away from the center of the positioning circle is a planar structure, and the planar structure is obtained by connecting the positioning support to the substrate and then processing it.

[0019] The beneficial effect of adopting the above-mentioned further technical solution is that: according to the diameter of the inner circle of the sand core cavity, the side wall of the positioning support member away from the center of the positioning circle is processed to the diameter size of the inner circle of the sand core, so as to realize the positioning support of the inner wall of the sand core by the side wall of the positioning support member away from the center of the positioning circle; after the positioning support member is installed on the substrate, it is processed to the required size by milling, that is, it is precisely processed according to the required position and diameter to ensure the processing accuracy and facilitate processing.

[0020] The second aspect of the present invention is to provide a method for artificial core setting using the above-mentioned core cover structure for ventilated disk casting, comprising the following steps:

[0021] (1) Place the sand core at a certain distance above the lower core cover, and manually place the sand core vertically downward on the positioning support;

[0022] (2) Turn on the negative pressure suction mechanism;

[0023] (3) Manually place the lower core cover into the sand mold, and the sand core floats upward 0.3-0.5 mm during the process of being placed into the sand mold;

[0024] (4) Close the negative pressure suction mechanism, leave the sand mold in the sand mold, and withdraw the lower core cover.

[0025] Another aspect of the present invention is to provide a ventilated disc casting system, including the above-mentioned lower core cover structure for ventilated disc casting, and also including a sand core and a sand mold, the sand core having an initial position and a floating position in the sand mold, the initial position being 0.3-0.5mm lower than the floating position.

[0026] Compared with the prior art, the present invention has the following technical effects:

[0027] The lower core cover structure for ventilated disk casting provided by the present invention adopts three positioning support members on the same circumference to replace the supporting truncated table, thereby reducing the contact area, and the three positioning support members can determine a positioning center. The height of the positioning center can be changed by changing the height of the positioning support members. The height of the positioning center is designed to be 0.3-0.5mm lower than the theoretical position. During the artificial core setting process, the sand core can float upward by a certain small displacement, thereby reducing the mutual interference between the sand core and the inner wall of the sand mold. In this way, even if the center of the lower core cover is not accurately aligned with the center of the sand mold, since the sand core can float upward, the sand core can be avoided from being damaged by the mutual interference between the sand core and the inner wall of the sand mold, and the technical problems of sand core damage and broken core caused by inaccurate artificial core setting can be effectively solved.

[0028] By utilizing the hollow inner circle of the sand core without forming a casting, the inner circles of each sand core with little difference in the inner circle size of the casting can be designed to be the same size. The difference lies in the different wall thickness of the sand core, which can form a series of standard sand core sizes. In this way, castings with similar inner circle sizes can share a set of lower core covers, and there is no need to set up a set of lower core covers for each model of ventilation disk casting. As a result, sand cores for ventilation disk casting production with different outer circle sizes can share a lower core cover structure of the same size model, that is, different models of sand cores can use the same model of positioning support parts, which can realize standardization and generalization of lower core covers and is suitable for vertical line casting production of ventilation disks of different models, 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic structural diagram of a lower core cover according to an embodiment of the present invention is shown;

[0030] Figure 2 Show Figure 1 A magnified view of part A;

[0031] Figure 3 A schematic diagram showing the structure of a ventilated disc casting system;

[0032] Figure 4 A top view showing a ventilated disc casting system;

[0033] Figure 5 Show Figure 4 The cross-section along the AA direction;

[0034] Figure 6 A schematic diagram showing a supporting state of a positioning support member;

[0035] Reference numerals:

[0036] 1. Base plate; 2. First groove; 3. First positioning support; 4. Second positioning support; 5. Third positioning support; 6. Through hole; 7. Second groove; 8. Plane structure; 9. Bolt; 10. Sand mold; 11. Sand core; 12. Sand core cavity; 13. Positioning hole. DETAILED DESCRIPTION

[0037] The following specific embodiments illustrate the implementation of the present invention, and 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 invention are limited to this implementation. On the contrary, the purpose of introducing the invention in conjunction with the implementation is to cover other options or modifications that may extend based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will include 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 the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0038] See also Figure 1-2 A core cover structure for ventilated disk casting that is convenient for artificial core lowering includes a base plate 1, a first groove 2 is opened on the base plate 1, a first positioning support 3, a second positioning support 4, and a third positioning support 5 are arranged in the first groove 2, and the first positioning support 3, the second positioning support 4 and the third positioning support 5 are on the same circumference, the first positioning support 3, the second positioning support 4 and the third positioning support 5 determine a positioning center for positioning a sand core 11, that is, the three outer arcs of the first positioning support 3, the second positioning support 4 and the third positioning support 5 can form a circle, and the outer side walls of the first positioning support 3, the second positioning support 4 and the third positioning support 5 away from the positioning center are used to position the inner side wall of the supporting sand core 11.

[0039] Three positioning supports on the same circumference are used to replace the existing supporting cone structure, which reduces the contact area and is conducive to the upward floating of the sand core 11. The height of the positioning center can be changed by changing the height of the positioning support. The actual height of the positioning center is designed to be 0.3-0.5mm lower than the theoretical position, that is, the initial position is 0.3-0.5mm lower than the floating position. The height of the positioning center is determined by the positioning support. The theoretical position is the center position after the sand core is completely lowered into the sand mold. During the artificial core lowering process, the sand core can be guaranteed to float upward with a certain small displacement, thereby reducing the mutual interference between the sand core and the inner wall of the sand mold and avoiding damage to the sand core.

[0040] The first groove 2 is circular, and a plurality of second grooves 7 are provided on the first groove 2. The plurality of second grooves 7 are arranged on the side of the first positioning support 3, the second positioning support 4 and the third positioning support 5 away from the center of the positioning circle. Two through holes 6 are provided in each first groove 2 at intervals. One end of the through hole 6 is connected to the negative pressure suction mechanism, and the other end is connected to the supporting part of the sand core 11. The arrangement of each second groove 2 forms a closed space between it and the supporting part of the sand core 11. Through the suction of the negative pressure suction mechanism, a negative pressure environment is formed in the closed space, so that the sand core is stably adsorbed on the lower core cover to prevent the sand core from falling or shifting.

[0041] The first positioning support 3, the second positioning support 4, and the third positioning support 5 are all detachably connected to the base plate 1 through bolts 9. Specifically, the first positioning support 3, the second positioning support 4, and the third positioning support 5 are all hollow, and a threaded hole is opened on the first groove 2. The head of the bolt 9 extends into the hollow inner cavity of the first positioning support 3, the second positioning support 4, and the third positioning support 5, and the screw is screwed into the threaded hole. Through the detachable connection between each positioning support and the base plate 1, different types of positioning supports can be replaced according to different types of sand cores 11, so that the lower core cover can be standardized and universalized, which is suitable for the vertical line casting production of different types of ventilation disks, avoids too many types of lower core covers, reduces costs, reduces the number of tooling changes, and reduces the difficulty of tooling inventory and warehouse management.

[0042] The first positioning support member 3, the second positioning support member 4, and the third positioning support member 5 are all cylindrical structures, made of 45# round steel, and the side wall away from the center of the positioning circle is a plane structure 8. When manually assembling the lower core cover structure, each positioning support member is first installed on the base plate 1 by bolts 9, that is, the center of the positioning circle is determined, and then the outer wall of the first positioning support member 3, the second positioning support member 4, and the third positioning support member 5 is milled by a processing tool so that the diameter of the positioning circle formed with the center of the positioning circle matches the inner diameter of the sand core cavity 12, so as to realize the support and positioning of the sand core by the first positioning support member 3, the second positioning support member 4, and the third positioning support member 5. Specifically, during the milling process, the two positioning holes 13 opened on the base plate 1 play a role in processing positioning, which is convenient for realizing the precise milling of the first positioning support member 3, the second positioning support member 4, and the third positioning support member 5. At the same time, the positioning hole 13 also plays a role in connecting the lower core cover with the processing equipment.

[0043] The process of artificial core setting using the core cover structure provided by the present invention is as follows: first, the sand core 11 is placed 2-5 mm above the first positioning support 3, the second positioning support 4, and the third positioning support 5, and then the sand core cavity 12 is vertically downwardly supported on the first positioning support 3, the second positioning support 4, and the third positioning support 5. Figure 6 As shown, the sand core 11 automatically returns to its original position under the action of gravity, and the center of the sand core cavity 12 is aligned with the positioning center; the negative pressure suction mechanism is turned on, and the sand core 11 is stably adsorbed on the lower core cover under the action of negative pressure; the lower core cover and the sand core 11 are manually operated to enter the molding chamber, and the sand core 11 is lowered into the sand mold 10 (only the upper sand mold is shown in the figure, and the actual sand mold 10 includes an upper sand mold and a lower sand mold, and the core lowering process is to lower the sand core into the lower sand mold). During the core lowering process, the sand core 11 slightly floats 0.3-0.5mm under the action of the sand mold 10, and the sand core 11 is squeezed into the sand mold 10, and the sand core and the upper part of the sand mold 10 are interference fit; the negative pressure suction mechanism is closed, the sand core 11 is left in the sand mold 10, and the lower core cover is returned to complete the core lowering operation.

[0044] like Figure 3-5 As shown, a ventilated disc casting system includes a lower core cover, a sand core 11 and a sand mold 10. The lower core cover with the sand core 11 fixed thereon is manually lowered into the sand mold 10. The sand core 11 has an initial position and a floating position in the sand mold 10. The initial position is the starting position for manually lowering the sand core 11 into the sand mold 10, and the floating position is the position of the sand core 11 after floating upward in the sand mold 10. The initial position is 0.3-0.5 mm lower than the floating position.

[0045] The lower core cover structure for ventilated disc casting provided by the present invention adopts three positioning support members on the same circumference to replace the supporting truncated cone, thereby reducing the contact area, and the three positioning support members can determine a positioning center. The height of the positioning center can be changed by changing the height of the positioning support members. The height of the positioning center is designed to be 0.3-0.5mm lower than the theoretical position. During the artificial core setting process, the sand core can float upward by a certain small displacement, thereby reducing the mutual interference between the sand core and the inner wall of the sand mold, avoiding damage to the sand core, and effectively solving the technical problem of inaccurate artificial core setting, which is convenient for artificial core setting; by utilizing the hollow inner circle part of the sand core not to form a casting, the sand cores with different outer circle sizes for the casting production of ventilated discs can share a lower core cover structure of the same size model, that is, different models of sand cores can use the same model of positioning support members, 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, 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.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A lower core cover structure for ventilated disc casting, characterized in that: It comprises a base plate, on which three positioning support members are arranged, and the three positioning support members are on the same circumference, and the side walls of the three positioning support members away from the positioning circle center are used for positioning and supporting the inner side wall of the sand core.

2. The lower core cover structure for ventilated disc casting according to claim 1 is characterized in that: A first groove is formed on the base plate, and the three positioning support members are arranged in the first groove.

3. The lower core cover structure for ventilated disc casting according to claim 1 or 2, characterized in that: The base plate is also provided with a through hole, which is arranged on a side of the positioning support member away from the center of the positioning circle. One end of the through hole is connected to the negative pressure suction mechanism, and the other end is connected to the sand core.

4. The lower core cover structure for ventilated disc casting according to claim 3 is characterized in that: There is at least one through hole, a second groove is formed on the substrate, and at least one through hole is disposed in the second groove.

5. The lower core cover structure for ventilated disc casting according to claim 1, characterized in that: The positioning support member is detachably connected to the base plate.

6. The lower core cover structure for ventilated disc casting according to claim 5, characterized in that: The positioning support is hollow, a threaded hole is formed on the first groove, and the positioning support is connected to the base plate by bolts.

7. The lower core cover structure for ventilated disc casting according to claim 5, characterized in that: The positioning support is a cylindrical structure, and the side wall away from the center of the positioning circle is a planar structure. The planar structure is obtained by connecting the positioning support to the substrate and then processing it.

8. A method for artificial core setting using the core cover structure for ventilated disk casting according to any one of claims 1 to 7, characterized in that: The following steps are involved: (1) Place the sand core at a certain distance above the lower core cover, and manually place the sand core vertically downward on the positioning support; (2) Turn on the negative pressure suction mechanism; (3) Manually place the lower core cover into the sand mold, and the sand core floats upward 0.3-0.5 mm during the process of being placed into the sand mold; (4) Close the negative pressure suction mechanism, leave the sand mold in the sand mold, and withdraw the lower core cover.

9. A ventilated disc casting system, characterized in that: It comprises the lower core cover structure for ventilated disc casting according to any one of claims 1 to 7, and also comprises a sand core and a sand mold, wherein the sand core has an initial position and a floating position in the sand mold, and the initial position is 0.3-0.5 mm lower than the floating position.

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