Hot core mold for annular thin-wall product

Abstract

The utility model relates to a hot core die for an annular thin-wall product. The hot core die comprises an upper die template, a male die, a female die main body, a female die dismounting ring and a lower die core, the male die is arranged on the upper die template, and an outer convex forming surface is arranged on the male die; the top of the female die body is provided with an inner concave forming face, and the female die body and the female die disassembling ring are connected to form a forming female die. A forming cavity is formed in the lower die core and used for being assembled with the forming female die in a sliding mode and limiting the forming female die. An annular cavity is formed among the circumferential outer wall of the female die body, the top end of the female die dismounting ring and the inner wall of the forming cavity and used for forming an annular thin wall of a product. According to the utility model, the part with a weaker structure in the mold is independently split, so that the mold structure is effectively simplified while demolding is facilitated.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, and in particular to a hot core mold for annular thin-walled products. Background Technology

[0002] Hot-core molds are generally used for molding products made of materials such as rubber, plastics, and coated sand. Casting production often requires the creation of products with special shapes, such as those with thin, annular walls. For deep (large axial dimension) and thin (narrow radial width) annular walls, it is usually impossible to directly create the mold's forming surface through simple milling. This is because milling requires fine tools, which are often short, making it unsuitable for creating such deep and thin forming surfaces. The forming surface can only be created through electro-electro-etching (EDM) or by machining the thin-walled portion separately and then assembling it with the corresponding forming cavity of the main product. This often results in complex mold structures, high processing costs, and demanding assembly requirements. Furthermore, because the annular wall is so thin, it is impossible to design an effective ejection structure (sufficiently thick ejector pins). In some cases, forcibly increasing ejection to accommodate the thin wall can weaken the mold structure, leading to damage to the mold body or the product during ejection. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a hot core mold for annular thin-walled products. The purpose is to separate the weaker structural parts of the mold, facilitating demolding while effectively simplifying the mold structure.

[0004] The technical solution adopted in this utility model is as follows:

[0005] A hot core mold for annular thin-walled products includes an upper mold template, a punch, a die body, a die separation ring, and a lower mold core;

[0006] The punch is disposed on the upper die template, and the punch has an externally convex forming surface;

[0007] The top of the die body has a concave forming surface, and the die body and the die disassembly ring are connected to form a forming die.

[0008] The lower mold core is provided with a forming cavity, which is used to slide and assemble with the forming die and to limit the forming die.

[0009] An annular cavity is formed between the outer circumference of the die body, the top of the die disassembly ring, and the inner wall of the forming cavity, for forming the annular thin wall of the product.

[0010] The further technical solution is as follows:

[0011] The die-cutting ring is ring-shaped and tightly fitted onto the outer wall of the die-cutting body.

[0012] The outer wall of the die-removing ring is provided with an outer step, and the lower die core is provided with an inner step that cooperates with the limiting outer step to limit the die-removing ring.

[0013] The molding cavity extends axially through the lower mold core.

[0014] The inner wall of the molding cavity located below the inner step surface is axially slidingly fitted with the outer wall of the die removal ring located below the outer step surface.

[0015] The stroke of the sliding fit is determined by the gap distance formed between the inner step surface and the outer step surface when the concave mold ring is flush with the bottom end face of the lower mold core.

[0016] The die-removing ring is coaxially arranged with the die body.

[0017] When the mold is closed, the upper mold template and the lower mold core move towards each other. When the bottom end of the convex forming surface contacts the top end of the concave forming surface, the upper mold template and the lower mold core do not contact each other.

[0018] During mold closing, the upper mold template and the lower mold core move towards each other. After the upper mold template and the lower mold core come into contact, the die-opening ring is flush with the bottom end face of the lower mold core.

[0019] The upper mold template is used to connect with the upper equipment platform, and the lower mold core is used to connect with the lower equipment platform.

[0020] The beneficial effects of this utility model are as follows:

[0021] This invention separates the structurally weak, thin-walled portion of the mold and uses the separated portion for overall ejection, which not only facilitates demolding but also effectively simplifies the mold structure. Specifically, it has the following advantages:

[0022] This invention utilizes a die body and a die disassembly ring to form the die portion of the forming surface of the mold. The two can be separated, and the die body and die disassembly ring can be formed by simple milling, which reduces the difficulty of mold processing.

[0023] This invention uses a separately detachable die-cutting ring to form a weaker part of the molding surface structure, which is not only easy to disassemble and assemble, but also facilitates the later maintenance and replacement of the mold, thus reducing the mold repair cost.

[0024] This invention indirectly achieves product ejection and demolding through the sliding cooperation between the concave mold release ring and the lower mold core, avoiding the use of spring and ejector rod structures and preventing problems such as easy damage to the mold body or product damage during ejection. It also simplifies the overall mold structure and reduces mold development costs.

[0025] Other features and advantages of this invention will be set forth in the following description or may be learned by practicing this invention. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the mold in the closed state according to an embodiment of the present invention.

[0027] Figure 2 This is an exploded structural diagram of the die body, die disassembly ring, and lower die core of this utility model embodiment.

[0028] Figure 3 This is a flowchart illustrating the production process of an embodiment of this utility model.

[0029] Figure 4 This is a flowchart illustrating the mold-opening process after production is completed in an embodiment of this utility model.

[0030] Figure 5 for Figure 4 Enlarged view of section A.

[0031] In the diagram: 1. Upper mold template; 2. Punch; 3. Die body; 4. Die ring; 5. Lower mold core; 6. Annular cavity; 7. Gap; 8. Product; 9. Upper equipment platform; 10. Lower equipment platform; 201. Outer convex forming surface; 301. Inner concave forming surface; 401. Outer step; 501. Inner step. Detailed Implementation

[0032] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0033] like Figure 1 As shown, the hot core mold for annular thin-walled products in this embodiment includes an upper mold template 1, a punch 2, a die body 3, a die removal ring 4, and a lower mold core 5;

[0034] The punch 2 is set on the upper die template 1, and the punch 2 is provided with an externally protruding forming surface 201;

[0035] The top of the die body 3 has an inwardly concave forming surface 301, and the die body 3 is connected with the die disassembly ring 4 to form a forming die.

[0036] The lower mold core 5 is provided with a forming cavity, which is used to slide and assemble with the forming die and to limit the forming die.

[0037] An annular cavity 6 is formed between the outer circumference of the die body 3, the top of the die disassembly ring 4, and the inner wall of the molding cavity, for molding the annular thin wall of the product.

[0038] Among them, the die-cutting ring 4 is ring-shaped and tightly fitted on the outer wall of the die body 3.

[0039] Among them, see Figure 2 The outer wall of the die removal ring 4 is provided with an outer step 401, and the lower die core 5 is provided with an inner step 501 that cooperates with the limiting outer step 401 to limit the die removal ring 4.

[0040] The inner wall of the molding cavity located below the inner step 501 is axially slidingly fitted with the outer wall of the die disassembly ring 4 located below the outer step 401.

[0041] As a preferred embodiment, the upper mold template 1 is provided with an embedding groove for embedding the punch 2 therein.

[0042] As a preferred embodiment, the molding cavity extends axially through the lower mold core 5.

[0043] The sliding fit stroke is determined by the gap 7 formed between the inner step 501 and the outer step 401 when the bottom end face of the die-cutting ring 4 and the lower die core 5 are flush.

[0044] As a preferred embodiment, the die-removing ring 4 is coaxially arranged with the die body 3.

[0045] As a preferred embodiment, the concave mold ring 4 is a hollow ring-shaped block with an outer step 401 located at its lower outer end, giving it a convex shape.

[0046] As a preferred embodiment, the die body 3 is a cylindrical block.

[0047] As a preferred embodiment, the lower mold core 5 is a hollow cylindrical structure with an inner step 501.

[0048] See Figure 3 When using the mold of this embodiment for production, firstly, the die-removing ring 4 is placed on the die-removing body 3, with the inner ring of the die-removing ring 4 tightly fitted to the outer side of the bottom end of the die-removing body 3. Then, it is installed into the lower die core 5, with the outer ring below the outer step 401 of the die-removing ring 4 slidingly fitted to the inner ring below the inner step 501 in the forming cavity of the lower die core 5 until the outer step 401 and the inner step 501 are in contact. Then, the upper die template 1 is connected to the upper equipment platform 9 of the sand-shooting equipment, and the lower die core 5 is connected to the lower equipment platform 10 of the sand-shooting equipment. The states before mold closing, after mold closing and sand-shooting, and the product forming states after sand-shooting are respectively as follows: Figure 3 As shown in (a), (b), and (c).

[0049] like Figure 3As shown in (a), during the mold closing process, the upper mold template 1 and the lower mold core 5 move towards each other. When the bottom end of the convex forming surface 201 contacts the top end of the concave forming surface 301, the upper mold template 1 and the lower mold core 5 do not contact each other. Then, the upper mold template 1 continues to move towards the lower mold core 5. Because the clearance between the die body 3 and the die removal ring 4 is small, while the clearance between the die removal ring 4 and the lower mold core 5 is large, the die body 3 and the die removal ring 4 begin to slide until the die removal ring 4 is flush with the bottom end face of the lower mold core 5, and the lower end face of the upper mold template 1 contacts the upper end face of the lower mold core 5, thus completing the mold closing. Figure 3 As shown in (b), at this time, the forming space in the forming cavity of the lower mold core 5 is formed by the outer convex forming surface 201 of the punch 2, the inner concave forming surface 301 of the die body 3, and the annular cavity 6. Figure 3 As shown in (c), after the mold is closed, production begins. Sand is injected into the molding space through a sand-shooting device, forming product 8 in the molding space. A thin wall of product 8 is formed inside the annular cavity 6.

[0050] See Figure 4 After product 8 is formed, the mold is opened. The upper mold platen 1 and the lower mold core 5 move in opposite directions until they separate. Because product 8 shrinks after cooling, the clamping force with the punch 2 is relatively large. Therefore, product 8 moves together with the punch 2 and the upper mold platen 1 until the outer step 401 of the die release ring 4 contacts the inner step 501 of the lower mold core 5. Figure 4 (d) and Figure 5 As shown. Under the pull of the upper mold platen 1, the product, which has already begun to detach from the lower mold core 5, begins to detach from the die body 3 and the die separation ring 4. Finally, the product 8 remains on the punch 2, completing the demolding of the entire product, as shown. Figure 4 As shown in (e). After product 8 is removed, the mold closing action restarts to begin the next round of production.

[0051] It will be understood by those skilled in the art that the above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A hot core mold for annular thin-walled products, characterized in that, It includes an upper mold template (1), a punch (2), a die body (3), a die disassembly ring (4), and a lower mold core (5); The punch (2) is disposed on the upper die template (1), and the punch (2) is provided with an external convex forming surface (201); The top of the die body (3) has an inwardly concave forming surface (301), and the die body (3) is connected to the die disassembly ring (4) to form a forming die; The lower mold core (5) is provided with a forming cavity, which is used to slide and assemble with the forming die and to limit the forming die; An annular cavity (6) is formed between the outer circumference of the die body (3), the top of the die disassembly ring (4), and the inner wall of the forming cavity, for forming the annular thin wall of the product.

2. The hot core mold for annular thin-walled products according to claim 1, characterized in that, The die-cutting ring (4) is ring-shaped and tightly fitted on the outer wall of the die body (3).

3. The hot core mold for annular thin-walled products according to claim 2, characterized in that, The outer wall of the die-removing ring (4) is provided with an outer step (401), and the lower die core (5) is provided with an inner step (501) that cooperates with the limiting outer step (401) to limit the die-removing ring (4).

4. The hot core mold for annular thin-walled products according to claim 3, characterized in that, The molding cavity extends axially through the lower mold core (5).

5. The hot core mold for annular thin-walled products according to claim 4, characterized in that, The inner wall of the molding cavity located below the step surface of the inner step (501) and the outer wall of the die disassembly ring (4) located below the step surface of the outer step (401) slide together axially.

6. The hot core mold for annular thin-walled products according to claim 5, characterized in that, The stroke of the sliding fit is determined by the gap (7) formed between the inner step (501) and the outer step (401) when the bottom end face of the concave mold disassembly ring (4) and the lower mold core (5) are flush.

7. The hot core mold for annular thin-walled products according to claim 2, characterized in that, The die-removing ring (4) is coaxially arranged with the die body (3).

8. The hot core mold for annular thin-walled products according to claim 1, characterized in that, When the mold is closed, the upper mold template (1) and the lower mold core (5) move towards each other. When the bottom end of the convex forming surface (201) contacts the top end of the concave forming surface (301), the upper mold template (1) and the lower mold core (5) do not contact each other.

9. The hot core mold for annular thin-walled products according to claim 8, characterized in that, When the mold is closed, the upper mold template (1) and the lower mold core (5) move towards each other. After the upper mold template (1) and the lower mold core (5) come into contact, the concave mold disassembly ring (4) is flush with the bottom end face of the lower mold core (5).

10. The hot core mold for annular thin-walled products according to claim 1, characterized in that, The upper mold template (1) is used to connect with the upper equipment platform (9), and the lower mold core (5) is used to connect with the lower equipment platform (10).

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