Sand core structure for casting
By designing the sand core structure for casting, using stepped core heads and contact surfaces with different gaps, combined with venting plates and venting pins, the problems of high sand core cost and difficulty in core placement were solved, achieving the effects of reducing costs, improving production efficiency and casting quality.
Patent Information
- Application Number
- CN202423021631.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-09
- Publication Date
- 2025-12-16
- Estimated Expiration
- 2034-12-09
AI Technical Summary
Existing sand cores are expensive and difficult to insert manually, affecting production efficiency and cost.
Design a sand core structure for casting, including a stepped core head and contact surfaces with different gaps, combined with venting plates and venting pins, to ensure that the outer mold does not press on the sand core when the mold is closed, preventing sand chipping and molten iron from seeping in, increasing stability and gas discharge.
It reduces the cost of sand core production, improves the convenience of core setting and the quality of castings, ensures the stability of castings and production efficiency, and reduces the impact of gas.
Smart Images
Figure CN223670167U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to foundry technology field, especially a kind of sand core structure for casting. BACKGROUND
[0002] In sand mould casting field, sand core as an important auxiliary material, plays an important role.Sand core refers to hollow structure by sand-like material and binder, the role of sand core is to form the inner cavity of casting, various holes and the part that is difficult to directly mold due to complex casting shape.
[0003] But the cost of sand core is higher, limit its application universality to some extent.In actual operation, it is difficult to manually carry out core setting operation for some bulky or heavy sand core, not only time-consuming and laborious, but also increase production cost.
[0004] Therefore, how to reduce its manufacturing cost while ensuring the quality of sand core and optimize the core setting becomes a problem to be solved in sand mould casting field. SUMMARY
[0005] The utility model mainly solves the technical problem to provide a kind of sand core structure for casting, to sand core inner hole and sand core wall thickness guarantee design, reduce cost, guarantee sand core strength and prevent burning through, hole is convenient for core setting and is not damaged;In the contact surface of sand core head and corresponding sand gap of design different size, ensure that outer mould does not press sand core when box, prevent knock sand and sand eye, avoid the influence of direct contact on casting, guarantee casting quality and efficiency, prevent iron water from seeping in, increase stability, reduce gas influence, ensure high-quality production of casting.
[0006] To solve the above technical problems, one technical scheme of the utility model is: a kind of sand core structure for casting, comprising: the lower box sand and upper box sand in sand box, the lower box sand and upper box sand are jointly formed cavity and constitute the cavity of casting forming, the sand core is installed in the cavity, the sand core is hollowed out and forms thin-walled structure along the axial direction of casting, the core head part of the sand core is set to stepped structure, with sequentially formed first outer edge, second outer edge, third outer edge and fourth outer edge;
[0007] When the lower box sand and upper box sand are boxed, the gap one is formed between the contact surface of the first outer edge and corresponding sand, the gap two is formed between the contact surface of the second outer edge and corresponding sand, the third outer edge and corresponding sand are tightly matched, and the gap four is formed between the contact surface of the fourth outer edge and corresponding sand.
[0008] In a preferred embodiment of the utility model, the core head part of the sand core is set to exceed the casting in axial direction, and the exceeding distance is at least 20mm.
[0009] In a preferred embodiment of the present application, the wall thickness of the sand core is in the range of 20-25mm.
[0010] In a preferred embodiment of the present application, the size of the gap one is 0.5-1mm, the size of the gap two is 0.2-0.5mm, and the size of the gap four is 0.5-0.7mm.
[0011] In a preferred embodiment of the present application, the size of the gap one is 0.5mm, the size of the gap two is 0.3mm, and the size of the gap four is 0.5mm.
[0012] In a preferred embodiment of the present application, the joint position of the second outer edge and the third outer edge has a flange, which extends along the outer circumferential direction of the sand core.
[0013] In a preferred embodiment of the present application, the length of the flange is 5-10mm, and the thickness is 5-10mm.
[0014] In a preferred embodiment of the present application, a parting surface is arranged between the lower box-type sand and the upper box-type sand, and the parting surface is connected with the exhaust fin and the exhaust pin.
[0015] In a preferred embodiment of the present application, the thickness of the exhaust fin is 5-10mm, and the diameter of the exhaust pin is 15-20mm.
[0016] In a preferred embodiment of the present application, a core setting alignment platform is arranged on the sand core, and the surface of the alignment platform is flush with the upper surface of the lower box-type sand.
[0017] The present application has the advantages of: the hole-punching thin-wall design reduces the cost, ensures the strength of the sand core and prevents burning, the hole-punching facilitates the core setting without damage; the special structure of the core head prevents the sand from being pressed, ensures the quality of the castings and the production efficiency, prevents the iron water from seeping through the tight fit, avoids the empty space to increase the stability, effectively exhausts the gas to reduce the influence of the gas, and ensures the high-quality production of the castings. BRIEF DESCRIPTION OF DRAWINGS
[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.
[0019] Figure 1 is a structure schematic view of a preferred embodiment of the sand core structure for casting of the present application;
[0020] Figure 2 is Figure 1 a left view of
[0021] Figure 3 is Figure 1 a partial enlarged view of A in
[0022] Figure 4 is a structure schematic view of a preferred embodiment of the core structure parting surface connecting exhaust piece and exhaust needle for casting of the utility model;
[0023] Figure 5 is a structure schematic view of a preferred embodiment of the core structure parting surface connecting exhaust piece and exhaust needle for casting of the utility model;
[0024] The labels of the components in the drawings are as follows:
[0025] 1, lower box sand, 2, cavity, 3, casting, 4, core, 41, first outer edge, 42, second outer edge, 43, third outer edge, 44, fourth outer edge, 5, gap one, 6, gap two, 7, gap three, 8, gap four, 9, flange, 10, parting surface, 11, exhaust piece, 12, exhaust needle, 13, lower core alignment platform. DETAILED DESCRIPTION
[0026] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. The components of the embodiments of the utility model described and shown in the drawings can be arranged and designed in various different configurations.
[0027] Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but only represents selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the utility model.
[0028] The utility model relates to a preferred embodiment of a core structure for casting.
[0029] Please refer to Figures 1-5 :
[0030] The sand core structure for casting comprises lower box sand 1 and upper box sand placed in a sand box, and a cavity formed by the lower box sand 1 and the upper box sand together constitutes a mold cavity 2 for forming a casting 3, the shape and size of the mold cavity 2 match the external shape and size of the casting 3. A sand core 4 is installed inside the mold cavity 2, and the shape and size of the sand core 4 match the internal shape and size of the casting 3.
[0031] Specifically, first, the sand core 4 is hollowed inside and thin-walled structure is formed along the casting axial direction, wherein the wall thickness of the sand core 4 is ensured to be 20-25 mm, so as to reduce the cost and ensure the strength of the sand core, and effectively prevent the sand core from being burned through by high-temperature molten iron during casting.
[0032] Further, in order to ensure the integrity and high quality of the casting, the core head part of the sand core 4 is arranged to axially exceed the casting by at least 20 mm.
[0033] Secondly, the core head part of the sand core 4 is arranged in a stepped structure, having a first outer edge 41, a second outer edge 42, a third outer edge 43 and a fourth outer edge 44 formed in sequence, and when the lower box sand 1 and the upper box sand are combined, each outer edge is provided with a different gap size on the contact surface with the corresponding position of the mold sand.
[0034] In detail:
[0035] The gap one 5 is formed between the contact surface of the first outer edge 41 and the corresponding mold sand, and the size of the gap one 5 is 0.5-1 mm, which can ensure that the outer mold does not press the sand core during the combining process, thereby avoiding the phenomenon of knocking sand, i.e. preventing the sand from being squeezed into the mold cavity, and further causing defects such as sand eyes.
[0036] The gap two 6 is formed between the contact surface of the second outer edge 42 and the corresponding mold sand, and the size of the gap two 6 is 0.2-0.5 mm, which can avoid the influence of direct contact on the production of the casting, and ensure the quality and production efficiency of the casting.
[0037] The third outer edge 43 and the corresponding mold sand are tightly matched, i.e. the gap three 7 is 0, and there is no gap between them, which can ensure that the molten iron does not accidentally penetrate into the mold cavity during casting, and even if the sand core is slightly knocked during casting, this tight gap can effectively prevent the sand or molten iron from entering the mold cavity, thereby ensuring the quality of the casting.
[0038] The fourth outer edge 44 and the contact surface of the corresponding sand form a gap four 8, the size of the gap four 8 is 0.5-0.7mm, the gap four 8 can provide the necessary space, ensure that the sand core can have a certain space to adapt and adjust when affected by factors such as thermal expansion and contraction, assembly error, etc., avoid assembly problems or casting defects caused by too tight size, effectively improve the casting stability and ensure the quality of the casting.
[0039] Preferably, the size of the gap one 6 is 0.5mm, the size of the gap two 7 is 0.3mm, and the size of the gap four 8 is 0.5mm.
[0040] Further, the joint position of the second outer edge 42 and the third outer edge 43 has a flange 9 extending along the outer circumferential direction of the sand core, which can enhance the structural strength of the sand core.
[0041] Preferably, the length of the flange 9 is 5-10mm, and the thickness is 5-10mm.
[0042] Since the gas generated in the manufacturing process of the sand core mainly accumulates in the cavity of the sand core, according to the need, the utility model discloses a venting fin 11 and a venting needle 12 are connected on the parting surface 10 between the lower box sand and the upper box sand, so that the accumulated gas can be effectively discharged through the venting fin 11 and the venting needle 12 on the parting surface, thereby the risk of generating pores in the casting can be significantly reduced, and the influence of the gas on the casting manufacturing can be reduced.
[0043] Preferably, the thickness of the venting fin 11 is controlled to be 5-10mm, and the diameter of the venting needle 12 is controlled to be 15-20mm, so as to ensure that the gas can be smoothly discharged.
[0044] On the basis of the above structure, a lower core alignment platform 13 is further arranged on the sand core 4, and the arrangement of the lower core alignment platform can ensure that the sand core is accurately placed into the cavity. When the sand core is successfully lowered into place, the surface of the lower core alignment platform 13 reaches the same level height as the upper surface of the lower box sand 1, and the visual alignment state directly indicates that the sand core has been accurately installed to the predetermined position.
[0045] The beneficial effects of the sand core structure for casting are:
[0046] Sand core hole and wall thickness guarantee: the sand core is designed with a hole and a thin wall, which reduces the cost while ensuring a certain strength of the sand core, prevents it from being burned through by high-temperature molten iron during casting, and the hole is set according to the needs of the core pulling operation, so that the hand can be put in to ensure that the core pulling is convenient and will not damage the sand core.
[0047] The core head position special structure is designed as follows: the core head position is designed with different gap sizes corresponding to the contact surface of the sand, which ensures that the outer mold does not press the sand core when the mold is closed, prevents the sand from being knocked and the sand hole, avoids the direct contact to affect the casting, guarantees the casting quality and efficiency, tightly cooperates to prevent the iron water from penetrating, avoids the empty design to increase the stability, effectively discharges the accumulated gas, reduces the gas influence, and ensures the high-quality production of the casting.
[0048] The above only describes the embodiments of the present application, and does not limit the patent range of the present application. Any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, which is made by using the content of the present application, is also included in the patent protection range of the present application.
Claims
1. A sand core structure for use in casting, comprising: Lower flask sand and upper flask sand placed in a sand box, the cavity formed by the lower flask sand and the upper flask sand together constitutes the cavity of the casting forming, characterized in that, The sand core is installed inside the cavity, the sand core is hollowed inside and forms a thin-walled structure along the axial direction of the casting, the core head part of the sand core is arranged in a stepped structure, and has a first outer edge, a second outer edge, a third outer edge and a fourth outer edge formed in sequence; When the lower flask sand and the upper flask sand are combined, a gap one is formed between the first outer edge and the contact surface of the corresponding sand, a gap two is formed between the second outer edge and the contact surface of the corresponding sand, the third outer edge is tightly fitted with the contact surface of the corresponding sand, and a gap four is formed between the fourth outer edge and the contact surface of the corresponding sand.
2. The sand core structure for casting according to claim 1, characterized by The core head part of the sand core is arranged to exceed the casting in the axial direction, and the exceeding distance is at least 20mm.
3. The sand core structure for casting according to claim 1, characterized by, The wall thickness of the sand core is in the range of 20-25mm.
4. The sand core structure for casting according to claim 1, characterized by, The size of the gap one is 0.5-1mm, the size of the gap two is 0.2-0.5mm, and the size of the gap four is 0.5-0.7mm.
5. The sand core structure for casting according to claim 4, characterized by The size of the gap one is 0.5mm, the size of the gap two is 0.3mm, and the size of the gap four is 0.5mm.
6. The sand core structure for casting according to claim 1, wherein The connection position of the second outer edge and the third outer edge has a turn-up edge extending along the outer peripheral direction of the sand core.
7. The sand core structure for casting according to claim 6, wherein The length of the turn-up edge is 5-10mm, and the thickness is 5-10mm.
8. The sand core structure for casting according to claim 1, characterized by A parting surface is arranged between the lower flask sand and the upper flask sand, and the parting surface is connected with exhaust fins and exhaust pins.
9. The sand core structure for casting according to claim 8, characterized by The thickness of the exhaust fins is 5-10mm, and the diameter of the exhaust pins is 15-20mm.
10. The sand core structure for casting according to claim 1, characterized by, A lower core alignment platform is arranged on the sand core, and the surface of the alignment platform is flush with the upper surface of the lower flask sand.