Shell mold structure

Abstract

The utility model discloses a shell mold structure. The shell mold structure comprises an upper sand mold, a lower sand mold and a sand core assembly, the key points of the utility model are as follows: an upper mold cavity is formed on an upper parting surface of an upper sand mold; a lower mold cavity is formed in the lower parting surface of the lower sand mold; the sand core assembly comprises an upper sand core embedded in the upper mold cavity, a lower sand core embedded in the lower mold cavity and a partition plate sand core, the upper sand core forms an upper mold cavity and an upper riser from an upper parting surface, the lower sand core forms a lower mold cavity from a lower parting surface, and the riser base, the lower mold cavity and the upper mold cavity form a casting mold cavity; the partition plate sand core is arranged in the casting cavity to divide the casting cavity into an upper casting cavity and a lower casting cavity, an upper riser neck of the upper riser and a lower riser neck of the riser base are communicated with the upper casting cavity and the lower casting cavity respectively, namely, the shell mold is of a double-layer distribution structure, the upper riser can feed two castings, and the lower riser can feed the two castings. Therefore, the purpose of improving the molten iron utilization rate and the yield is achieved.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts casting technology, specifically to a shell mold structure. Background Technology

[0002] Some components (castings) of heavy vehicle axles are cast using coated sand shell molds. Existing shell mold structures include a lower sand mold and an upper sand mold. The upper sand mold has an upper core, an upper sprue, an upper runner connected to the upper sprue, and an upper riser connected to the upper runner. The lower sand mold has a lower mold cavity, a sprue recess connected to the upper sprue, and a lower sand core. The lower sand core is embedded in the lower mold cavity and has a lower cavity corresponding to the upper core, a riser recess corresponding to the upper riser, and a lower riser neck. The lower riser neck is located between and connected to the lower cavity and the lower riser recess. When the upper and lower sand molds are closed, the lower cavity and the upper core form a casting cavity, which is used to form the casting. However, the above-mentioned shell molds have low molten iron utilization and yield. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a shell mold structure that can improve the utilization rate and yield of molten iron.

[0004] To achieve the above objectives, the embodiments of this utility model adopt the following technical solutions:

[0005] The shell mold structure includes an upper sand mold, a lower sand mold located below the upper sand mold, and a sand core assembly;

[0006] The upper sand mold has an upper parting surface and forms an upper mold cavity on the upper parting surface, as well as an upper sprue and an upper horizontal sprue located on one side of the mold cavity. The upper horizontal sprue is connected to the upper sprue.

[0007] The lower sand mold has a lower parting surface, and on the lower parting surface, a lower mold cavity corresponding to the upper mold cavity, a sprue socket communicating with the upper sprue, and a lower sprue communicating with the upper sprue are formed.

[0008] The sand core assembly includes an upper sand core embedded in the upper mold cavity, a lower sand core embedded in the lower mold cavity, and a partition sand core. The upper sand core is recessed upward from the upper parting surface to form an upper mold cavity and an upper riser. The upper riser is located on one side of the upper mold cavity and communicates with the upper horizontal runner. The lower sand core is recessed downward from the lower parting surface to form a lower mold cavity corresponding to the upper mold cavity and a riser socket corresponding to and communicating with the upper riser. The lower mold cavity and the upper mold cavity form a casting cavity. The partition sand core is disposed in the casting cavity to divide the casting cavity into an upper casting cavity and a lower casting cavity. The upper riser neck of the upper riser and the lower riser neck of the riser socket communicate with the upper casting cavity and the lower casting cavity, respectively.

[0009] Furthermore, the inner wall of the upper cavity is recessed outward along its circumference to form an upper groove corresponding to the upper riser neck, and the upper groove extends downward to the upper parting surface. The inner wall of the lower cavity is recessed outward along its circumference to form a lower groove corresponding to the lower riser neck, and the lower groove extends upward to the lower parting surface. The outer wall of the partition sand core extends outward around its circumference to form an annular protrusion, and the top and bottom ends of the protrusion respectively mate with the upper groove and the lower groove.

[0010] Furthermore, both the upper groove and the lower groove are annular, with the upper groove lower than the top surface of the upper riser neck and the lower groove higher than the bottom surface of the lower riser neck. The top surface of the protrusion is in close contact with the top surface of the upper groove, and the bottom surface of the protrusion is in close contact with the bottom surface of the lower groove.

[0011] Furthermore, there is a first distance between the top surface of the protrusion and the top surface of the upper riser neck, and a second distance between the bottom surface of the protrusion and the bottom surface of the lower riser neck, the second distance being equal to the first distance.

[0012] Furthermore, there are two upper cavities, the upper riser is located between the two upper cavities, and an upper riser neck is provided between the upper riser and each upper cavity. There are two lower cavities, one lower cavity corresponds to one upper cavity and the two form a casting cavity. A partition sand core is provided between each casting cavity. The riser socket is located between the two lower cavities and a lower riser neck is provided between it and each lower cavity.

[0013] Furthermore, the upper parting surface is recessed upward between the two upper riser necks to form an inner gating system, the inner gating system being located between the upper riser and the upper horizontal gating system and communicating with both the upper riser and the upper horizontal gating system.

[0014] Furthermore, there are multiple upper mold cavities, which are arranged in a row along the length of the shell mold structure. The upper sprue is located between two rows of upper mold cavities. Correspondingly, there are multiple lower mold cavities, with one lower mold cavity corresponding to one upper mold cavity. There are multiple sets of sand core assemblies, with the upper and lower sand cores of one set of sand core assemblies respectively embedded in the corresponding upper and lower mold cavities. The upper sand mold has a venting channel corresponding to each upper riser, and the venting channel is located on the top surface of the upper riser.

[0015] The shell mold structure of this utility model incorporates a sand core assembly. The upper sand core of the assembly is recessed upward from the upper parting surface to form an upper cavity and an upper riser. The lower sand core of the assembly is recessed downward from the lower parting surface to form a lower cavity corresponding to the upper cavity and a riser socket corresponding to and connected to the upper riser. The lower cavity and the upper cavity form a casting cavity. A partition sand core is placed inside the casting cavity to divide it into an upper casting cavity and a lower casting cavity. The upper riser neck of the upper riser and the lower riser neck of the riser socket are connected to the upper casting cavity and the lower casting cavity, respectively, allowing the upper casting cavity and the lower casting cavity to be cast into a single casting. In other words, the shell mold adopts a double-layer mold structure, and the upper riser can feed the two castings, thereby improving the utilization rate of molten iron and the yield. Attached Figure Description

[0016] Figure 1 This is a partial sectional view of the shell mold structure according to an embodiment of the present utility model;

[0017] Figure 2 for Figure 1 A magnified view of part A;

[0018] Figure 3 for Figure 1 A three-dimensional schematic diagram of the casting and gating system after demolding;

[0019] Figure 4 for Figure 1 A three-dimensional schematic diagram of the sand core assembly. Detailed Implementation

[0020] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments:

[0021] like Figures 1 to 4 As shown, this utility model embodiment provides a shell mold structure applied to a coated sand mold for molding heavy vehicle parts (castings 100), including an upper sand mold 1, a lower sand mold 2 located below the upper sand mold 1, and a sand core assembly 3.

[0022] like Figure 1 , Figure 2 and Figure 3 As shown, the upper sand mold 1 has an upper parting surface 11, on which an upper mold cavity 12 is formed, and an upper sprue 13 and an upper runner 14 are located on one side of the mold cavity. The upper runner 14 is connected to the upper sprue 13. There are multiple upper mold cavities 12, which are arranged in a row along the length of the shell mold structure. There are multiple rows of upper mold cavities 12, and the upper sprue 13 is located between two rows of upper mold cavities 12.

[0023] like Figure 1 , Figure 2 and Figure 3As shown, the lower sand mold 2 has a lower parting surface 21, and on the lower parting surface 21, a lower mold cavity 22 corresponding to the upper mold cavity 12, a sprue socket (not shown) connected to the upper sprue 13, and a lower sprue 23 connected to the upper sprue 14 are formed. There are multiple lower mold cavities 22, and each lower mold cavity 22 corresponds to one upper mold cavity 12.

[0024] like Figure 1 , Figure 2 and Figure 4 As shown, the sand core assembly 3 includes an upper sand core 31 embedded in the upper mold cavity 12, a lower sand core 32 embedded in the lower mold cavity 22, and a partition sand core 33. Specifically, there are multiple sets of sand core assemblies 3, and the upper sand core 31 and lower sand core 32 of each set of sand core assemblies 3 are respectively embedded in a corresponding upper mold cavity 12 and lower mold cavity 22. The upper sand core 31 is recessed upward from the upper parting surface 11 to form an upper cavity 311 and an upper riser 312. The upper riser 312 is located on one side of the upper cavity 311 and communicates with the upper horizontal runner 14 (e.g., Figure 3 (As shown). The lower sand core 32 is recessed downward from the lower parting surface 21 to form a lower cavity 321 corresponding to the upper cavity 311 and a riser socket 322 corresponding to and connected to the upper riser 312. When the lower sand mold 2 and the upper sand mold 1 are closed, the riser socket 322 and the upper riser 312 form a feeding riser, and the lower cavity 321 and the upper cavity 311 form a casting cavity 34. The partition sand core 33 is provided in the casting cavity 34 to divide the casting cavity 34 into an upper casting cavity 3. 41 and the lower casting cavity 342, the upper riser neck 3121 of the upper riser 312 and the lower riser neck 3221 of the riser socket 322 are respectively connected to the upper casting cavity 341 and the lower casting cavity 342, so that the upper casting cavity 341 and the lower casting cavity 342 are respectively cast into a casting 100. That is, the shell mold adopts a double-layer mold structure, and the upper riser 312 can feed the two castings 100, thereby achieving the purpose of improving the utilization rate of molten iron and the yield.

[0025] like Figure 1 , Figure 2 and Figure 4As shown, the inner wall of the upper cavity 311 is recessed outward along its circumference to form an upper groove 3111 for positioning, corresponding to the upper riser neck 3121. The upper groove 3111 is lower than the top surface of the upper riser neck 3121 so that an upper channel for molten metal to pass through is formed between the top surface of the protrusion 331 and the top surface of the upper riser neck 3121, and extends downward to the upper parting surface 11. The inner wall of the lower cavity 321 is recessed outward along its circumference to form a groove for positioning. The lower groove 3211 is higher than the bottom surface of the lower riser neck 3221, so that the bottom surface of the protrusion 331 and the bottom surface of the lower riser neck 3221 form a channel for the passage of molten metal, and extends upward to the lower parting surface 21. The outer wall of the partition sand core 33 extends outward in a ring shape around its circumference to form a protrusion 331. The top and bottom ends of the protrusion 331 cooperate with the upper groove 3111 and the lower groove 3211 respectively to position the partition sand core 33. Specifically, both the upper groove 3111 and the lower groove 3211 are ring-shaped. The top surface of the protrusion 331 is in close contact with the top surface of the upper groove 3111, and the bottom surface of the protrusion 331 is in close contact with the bottom surface of the lower groove 3211 to improve the sealing effect between the upper casting cavity 341 and the lower casting cavity 342 and ensure the forming quality of the casting 100. There is a first gap D1 between the top surface of the protrusion 331 and the top surface of the upper riser neck 3121, which forms the upper channel. There is a second gap D2 between the bottom surface of the protrusion 331 and the bottom surface of the lower riser neck 3221, which forms the lower channel. The second gap D2 is equal to the first gap D1 to ensure the shrinkage compensation effect.

[0026] like Figure 1 , Figure 2 and Figure 4 As shown, in this embodiment, each sand core assembly 3 has two upper cavities 311 in its upper sand core 31. An upper riser 312 is located between the two upper cavities 311. An upper riser neck 3121 is provided between the upper riser 312 and each upper cavity 311. The upper parting surface 11 is also recessed upward between the two upper riser necks 3121 to form an inner gating channel 15. The inner gating channel 15 is located between the upper riser 312 and the upper horizontal gating channel 14 and is connected to the upper riser 312 and the upper horizontal gating channel. 14. Connectivity; Correspondingly, each sand core assembly 3 has two lower cavities 321 in its lower sand core 32, with each lower cavity 321 corresponding to an upper cavity 311 and forming a casting cavity 34. A partition sand core 33 is provided between each casting cavity 34. A riser socket 322 is provided between the two lower cavities 321 and a lower riser neck 3221 is provided between each lower cavity 321, so that the same feeding riser can feed four castings 100 (e.g., Figure 2 , Figure 3As shown), further improve the utilization rate of molten iron. In order to avoid shrinkage porosity and shrinkage cavities in the casting 100, the upper sand mold 1 is also provided with a venting channel 16 for each upper riser 312, and the venting channel 16 is located on the top surface of the upper riser 312.

[0027] The shell mold structure of this utility model incorporates a sand core assembly. The upper sand core of the assembly is recessed upward from the upper parting surface to form an upper cavity and an upper riser. The lower sand core of the assembly is recessed downward from the lower parting surface to form a lower cavity corresponding to the upper cavity and a riser socket corresponding to and connected to the upper riser. The lower cavity and the upper cavity form a casting cavity. A partition sand core is placed inside the casting cavity to divide it into an upper casting cavity and a lower casting cavity. The upper riser neck of the upper riser and the lower riser neck of the riser socket are connected to the upper casting cavity and the lower casting cavity, respectively, allowing the upper casting cavity and the lower casting cavity to be cast into a single casting. In other words, the shell mold adopts a double-layer mold structure, and the upper riser can feed the two castings, thereby improving the utilization rate of molten iron and the yield.

[0028] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A shell-shaped mold structure, characterized in that, It includes an upper sand mold, a lower sand mold located below the upper sand mold, and a sand core assembly; The upper sand mold has an upper parting surface and forms an upper mold cavity on the upper parting surface, as well as an upper sprue and an upper horizontal sprue located on one side of the mold cavity. The upper horizontal sprue is connected to the upper sprue. The lower sand mold has a lower parting surface, and on the lower parting surface, a lower mold cavity corresponding to the upper mold cavity, a sprue socket communicating with the upper sprue, and a lower sprue communicating with the upper sprue are formed. The sand core assembly includes an upper sand core embedded in the upper mold cavity, a lower sand core embedded in the lower mold cavity, and a partition sand core. The upper sand core is recessed upward from the upper parting surface to form an upper mold cavity and an upper riser. The upper riser is located on one side of the upper mold cavity and communicates with the upper horizontal runner. The lower sand core is recessed downward from the lower parting surface to form a lower mold cavity corresponding to the upper mold cavity and a riser socket corresponding to and communicating with the upper riser. The lower mold cavity and the upper mold cavity form a casting cavity. The partition sand core is disposed in the casting cavity to divide the casting cavity into an upper casting cavity and a lower casting cavity. The upper riser neck of the upper riser and the lower riser neck of the riser socket communicate with the upper casting cavity and the lower casting cavity, respectively.

2. The shell mold structure as described in claim 1, characterized in that, The inner wall of the upper cavity is recessed outward along its circumference to form an upper groove corresponding to the upper riser neck. The upper groove extends downward to the upper parting surface. The inner wall of the lower cavity is recessed outward along its circumference to form a lower groove corresponding to the lower riser neck. The lower groove extends upward to the lower parting surface. The outer wall of the partition sand core extends outward around its circumference to form an annular protrusion. The top and bottom ends of the protrusion respectively mate with the upper groove and the lower groove.

3. The shell mold structure as described in claim 2, characterized in that, Both the upper groove and the lower groove are annular, with the upper groove being lower than the top surface of the upper riser neck and the lower groove being higher than the bottom surface of the lower riser neck. The top surface of the protrusion is in close contact with the top surface of the upper groove, and the bottom surface of the protrusion is in close contact with the bottom surface of the lower groove.

4. The shell mold structure as described in claim 2, characterized in that, There is a first distance between the top surface of the protrusion and the top surface of the upper riser neck, and there is a second distance between the bottom surface of the protrusion and the bottom surface of the lower riser neck, the second distance being equal to the first distance.

5. The shell mold structure as described in claim 1, characterized in that, The upper mold cavity has two parts, and the upper riser is located between the two upper mold cavities. An upper riser neck is provided between the upper riser and each upper mold cavity. The lower mold cavity has two parts, and one lower mold cavity corresponds to one upper mold cavity and the two form a casting mold cavity. A partition sand core is provided between each casting mold cavity. The riser socket is located between the two lower mold cavities and a lower riser neck is provided between it and each lower mold cavity.

6. The shell mold structure as described in claim 5, characterized in that, The upper parting surface is recessed upward between the two upper riser necks to form an inner gating system. The inner gating system is located between the upper riser and the upper horizontal gating system and is connected to both the upper riser and the upper horizontal gating system.

7. The shell mold structure as described in claim 1, characterized in that, The upper mold cavity has multiple cavities, which are arranged in a row along the length of the shell mold structure. The upper sprue is located between two rows of upper mold cavities. Correspondingly, the lower mold cavity has multiple cavities, with one lower mold cavity corresponding to one upper mold cavity. The sand core assembly has multiple sets, with the upper and lower sand cores of one set of sand core assemblies respectively embedded in the corresponding upper and lower mold cavities. The upper sand mold has a venting channel corresponding to each upper riser, and the venting channel is located on the top surface of the upper riser.

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