A sand core weight reduction structure applied to a low-pressure cavity subframe

Abstract

This utility model belongs to the field of automotive parts, specifically relating to a sand core weight reduction structure applied to a low-pressure cavity subframe. It includes a sand core body and a cover. The thicker portion of the sand core body is hollowed out to form a concave structure. A step, approximately the same thickness as the cover, is provided at the upper end of the concave structure to accommodate the thin-walled cover. When the sand core body and the sand core cover are combined, the outer surface forms the interior required for the casting, and the interior forms a box-shaped cavity weight reduction structure. This reduces the amount of core sand used, lowers the labor intensity of operators during handling, and improves the efficiency of subsequent sand removal, thus enhancing the sand removal effect.

Description

Technical Field

[0001] This utility model belongs to the field of automotive parts, specifically relating to a sand core weight reduction structure applied to a low-pressure cavity subframe. Background Technology

[0002] The subframe is a specially designed support structure for the front and rear axles and suspension system. Its main functions are to isolate vibrations and noise, improve driving comfort, enhance vehicle body rigidity, and optimize suspension system performance, enabling the vehicle to better handle various complex road conditions and ensuring a smooth and safe ride. Subframe manufacturing processes include steel plate stamping and welding, and casting. With increasing demands for energy conservation and environmental protection, especially the rapid development of new energy vehicles, low-pressure cast hollow subframes are gradually becoming mainstream due to their superior lightweight capabilities and rigidity.

[0003] Cavity subframes face challenges in production, such as high core-making costs and difficulty in removing core sand. While some products can solve this problem using a shell-core method, most cavity subframes are limited by their shape, and the shell-core process results in less core sand being poured out due to the small sand outlet, leading to insignificant practical effects. Utility Model Content

[0004] This invention proposes a sand core weight reduction structure for low-pressure cavity subframes to solve the problems of high core-making costs and difficulty in shaking off sand in the production process of existing cavity subframes.

[0005] To achieve the above objectives, the present invention proposes the following technical solution:

[0006] A sand core weight reduction structure for use in low-pressure cavity subframes includes a sand core body and several covering parts;

[0007] The sand core body is provided with a number of deep grooves corresponding to the cover, and the deep grooves are provided with the cover;

[0008] The vertical mating surface between the sand core body and the cover is 2°~5° with the vertical direction.

[0009] The fillet radius R1 of the mating surface of the sand core body is designed to be 0.5mm~1mm, and the fillet radius R2 of the mating surface of the cover part is R1+1~1.5mm.

[0010] Preferably, the minimum wall thickness T1 of the deep groove portion of the sand core body is ≥10mm; the wall thickness T2 of the cover is ≥8mm.

[0011] Preferably, the vertical mating surface gap D1 between the sand core body and the cover is designed to be 0.1mm~0.2mm.

[0012] Preferably, the horizontal mating surface gap D2 between the sand core body and the cover is designed to be 0.2mm~0.3mm.

[0013] Preferably, the deep groove is provided with steps, and the cover is provided on the deep groove through the steps.

[0014] The advantages of this utility model are:

[0015] This invention proposes a sand core weight reduction structure for use in low-pressure cavity subframes. The thicker part of the sand core body is hollowed out to form a deep groove. A step with a thickness equivalent to that of the cover is set at the upper end of the deep groove. After the sand core body and the sand core cover are combined, the outer surface forms the interior required for the casting, and the interior forms a box-shaped cavity weight reduction structure. This reduces the amount of core sand used, reduces the labor intensity of operators in handling the casting, and improves the efficiency of subsequent sand removal and the sand removal effect. Attached Figure Description

[0016] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments and descriptions of this utility model are used to explain this utility model and do not constitute an undue limitation thereof. In the drawings:

[0017] Figure 1 An exploded view of a sand core weight reduction structure applied to a low-pressure cavity subframe;

[0018] Figure 2 A three-dimensional structural diagram of a sand core weight reduction structure applied to a low-pressure cavity subframe;

[0019] Figure 3 This is a top view of a sand core weight reduction structure applied to a low-pressure cavity subframe;

[0020] Figure 4 This is an AA cross-sectional view of a sand core weight reduction structure applied to a low-pressure cavity subframe. Detailed Implementation

[0021] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0022] The following detailed description is exemplary and intended to provide further detailed explanation of the present invention. Unless otherwise specified, all technical terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this invention.

[0023] Please see Figure 1 , 2 As shown, this utility model provides a sand core weight reduction structure for a low-pressure cavity subframe, including a sand core body 1 and a cover; the cover includes a first cover 2, a second cover 3, a third cover 4, a fourth cover 5, a fifth cover 6 and a sixth cover 7.

[0024] The sand core body 1 is designed with a deep groove corresponding to the cover part, and a step is provided at the upper end of the deep groove to support the corresponding cover part. After the sand core body 1 and the cover part are assembled into a complete sand core, the outer surface forms a cavity molding surface for the subframe casting during the casting process, and a cavity is formed inside.

[0025] The minimum wall thickness T1 of the deep groove portion of the sand core body 1 is ≥10mm; the minimum wall thickness T1 of the portion is ≥10mm; the wall thickness T2 of the cover is ≥8mm; the wall thickness T2 is ≥8mm.

[0026] The top view of the sand core weight reduction structure applied to the low-pressure cavity subframe is as follows: Figure 3 As shown, the cross section at the connection between the sand core body 1 and the first cover 2 is the AA section.

[0027] The AA section is specifically as follows: Figure 4 As shown, the vertical mating surface of the sand core body 1 and the cover has an angle α of 2°~5° with the vertical direction; the vertical mating surface gap D1 between the sand core body 1 and the cover is designed to be 0.1mm~0.2mm; the horizontal mating surface gap D2 between the sand core body 1 and the cover is designed to be 0.2mm~0.3mm; the fillet radius R1 of the mating surface of the sand core body 1 is designed to be 0.5mm~1mm, and the fillet radius R2 of the mating surface of the cover is R1+1~1.5mm.

[0028] This invention proposes a sand core weight reduction structure for use in low-pressure cavity subframes. The thickest part of the sand core is selected, and the sand core is divided into a sand core body 1 and a cover. The thickest part of the sand core body 1 is hollowed out to form a concave structure. A step with a thickness equivalent to that of the cover is provided at the upper end of the concave structure. The cover is a thin-walled structure. After the sand core body 1 and the cover are combined, the outer surface forms the interior required for the casting, and the interior forms a box-shaped cavity weight reduction structure. This reduces the amount of core sand used, lowers the labor intensity of operators during handling, and improves the efficiency of subsequent sand removal, thus enhancing the sand removal effect.

[0029] After the sand core body 1 and the cover are assembled, the outer surface of the assembled sand core forms the inner cavity molding surface of the subframe casting; the box-shaped cavity formed between the sand core body and the sand core cover forms a weight-reducing part. During the production process, after the sand core is demolded, the operator assembles the sand core body 1 with the cover, and if necessary, an adhesive bonding process can be added for fixation; after casting, because the hollow structure of the sand core is more likely to collapse and form loose sand or small sand blocks, it is easier to be discharged from the sand outlet.

[0030] Through the above technical solution, this utility model provides a sand core weight reduction structure that is highly applicable to low-pressure cavity subframes. The structure is simple and highly applicable, which can effectively reduce the amount of core sand used, reduce the labor intensity of operators, improve the efficiency of shaking off sand, reduce sand residue, and reduce the manufacturing cost of cavity subframes.

[0031] As is known from common technical knowledge, this utility model can be implemented through other embodiments that do not depart from its spirit or essential characteristics. Therefore, the disclosed embodiments described above are merely illustrative in all respects and are not the only ones. All modifications within the scope of this utility model or its equivalents are included in this utility model.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of this utility model. Any modifications or equivalent substitutions that do not depart from the spirit and scope of this utility model should be covered within the protection scope of the claims of this utility model.

Claims

1. A sand core weight reduction structure applied to a low-pressure cavity subframe, characterized by, Includes the core body and several covering components; The sand core body is provided with a number of deep grooves corresponding to the cover, and the deep grooves are provided with the cover; The vertical mating surface between the sand core body and the cover is 2°~5° with the vertical direction. The fillet radius R1 of the mating surface of the sand core body is designed to be 0.5mm~1mm, and the fillet radius R2 of the mating surface of the cover part is R1+1~1.5mm.

2. The sand core weight reduction structure applied to a low-pressure cavity subframe as described in claim 1, characterized in that, The minimum wall thickness T1 of the deep groove portion of the sand core body is ≥10mm; the wall thickness T2 of the cover is ≥8mm.

3. The sand core weight reduction structure applied to a low-pressure cavity subframe as described in claim 1, characterized in that, The vertical mating surface gap D1 between the sand core body and the cover is designed to be 0.1mm~0.2mm.

4. The sand core weight reduction structure applied to a low-pressure cavity subframe as described in claim 1, characterized in that, The horizontal clearance D2 between the core body and the cover is designed to be 0.2mm~0.3mm.

5. The sand core weight reduction structure applied to a low-pressure cavity subframe as described in claim 1, characterized in that, The deep groove is provided with steps, and the cover is set on the deep groove through the steps.

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