Die for preventing casting from bulging

Abstract

The mold for preventing the casting from bulging comprises an upper mold body, a lower mold body, a left insert and a right insert, a through groove is formed in the middle of the lower mold body, the left insert and the right insert are oppositely arranged and installed in the through groove to form a lower cavity, and a lower pouring groove is formed in the lower mold body; the upper mold is provided with an upper cavity corresponding to the lower cavity, the inner edge surface of the upper cavity is provided with uniformly distributed bulges, the upper mold is provided with a lower pouring groove, the lower pouring groove and the upper pouring groove form a wax injection hole, and the upper cavity and the lower cavity are oppositely arranged to form a part cavity. According to the utility model, the plurality of uniformly distributed bulges are arranged in the upper cavity, and the large plane in the upper cavity is divided into a plurality of small planes by utilizing the arrangement of the bulges, so that the contact state of the large plane can be changed during wax mould making and molten steel pouring, the shrinkage resistance during solidification of the large plane is reduced, and the internal stress is dispersed, thereby reducing the risk of bulge deformation.

Description

Technical Field

[0001] This utility model relates to the field of casting technology, and more specifically, to a mold for preventing castings from bulging. Background Technology

[0002] Casting is a method of pouring liquid metal into a casting cavity that conforms to the shape of the part, and then cooling and solidifying it to obtain the part and blank. After cooling, solidification and cleaning, the liquid metal becomes a casting with a predetermined shape, size and properties. Because the casting blank is almost formed, it can achieve the purpose of eliminating or minimizing machining, which reduces costs and reduces production time to a certain extent.

[0003] For small castings, the casting process is relatively simple. However, for large castings, especially large castings, there are large flat surfaces. The adhesion between the large flat surfaces and the surface coating is weaker than that between the small flat surfaces and the surface coating. This results in insufficient strength of the mold shell in the large flat areas. After the liquid metal fills the mold shell cavity, the large flat areas suffer from uneven heat dissipation and inconsistent solidification shrinkage. The static and dynamic pressures on the mold shell cause bulging and deformation defects in the large flat areas of the casting.

[0004] Large flat surfaces are generally used for assembly and require machining. Once bulging or deformation defects occur, the casting will be difficult to grind or even scrapped; the machining allowance will increase and the tool wear will be severe.

[0005] Therefore, it is necessary to propose a mold to prevent bulging in castings, in order to solve the technical problem that air bubbles easily appear on large flat surfaces, leading to bulging, which is of great significance for improving the casting quality of castings. Utility Model Content

[0006] This utility model provides a mold to prevent bulging of castings, thereby solving the technical problem that bulging easily occurs on large flat surfaces of existing castings, causing deformation of the castings and affecting the quality of the castings.

[0007] According to one aspect of this utility model, a mold for preventing casting bulges is provided, comprising an upper mold, a lower mold, a left insert, and a right insert. A through groove is provided in the middle of the lower mold. The left insert and the right insert are arranged opposite to each other and installed in the through groove to form a lower cavity. A lower pouring groove is provided on the lower mold. An upper cavity corresponding to the lower cavity is provided on the upper mold. Evenly distributed protrusions are provided on the inner edge surface of the upper cavity. A lower pouring groove is provided on the upper mold. The lower pouring groove and the upper pouring groove form a wax injection hole. The upper cavity and the lower cavity are arranged opposite to each other to form a part cavity.

[0008] Based on the above scheme, a preferred embodiment is provided in the upper cavity, and an inner pouring port is provided inside the inner pouring port.

[0009] Based on the above scheme, preferably, both the left insert and the right insert include a baffle, the lower part of the baffle extends vertically outward to form a stop body, and a limiting edge is provided between the stop body and the baffle.

[0010] Based on the above scheme, a preferred embodiment is provided in the lower cavity, wherein the flange is adapted to the limiting flange.

[0011] Based on the above scheme, preferably, there are multiple lower pouring grooves, which are evenly spaced on the lower mold, and the upper pouring grooves are arranged opposite to the lower pouring grooves.

[0012] This utility model discloses a mold for preventing casting bulges. By setting multiple evenly distributed protrusions in the upper cavity, the large flat surface in the upper cavity is divided into several smaller flat surfaces. During wax model making and molten steel pouring, the contact state of the large flat surface can be changed, reducing the shrinkage resistance during solidification and dispersing internal stress, thereby reducing the risk of bulging deformation. When making the wax model shell, the contact area between the wax model and the shell surface can be increased, enhancing the strength of the shell.

[0013] On the other hand, the mold for preventing casting bulges of this utility model has multiple pouring gates evenly arranged around the large surface of the casting. The multi-point dispersed pouring method allows liquid metal to flow into the cavity from multiple directions at the same time, avoiding local concentrated impact of liquid metal in the large surface area and reducing uneven stress distribution caused by the pouring process. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0015] Figure 1 This is a schematic diagram of the mold for preventing casting bulging according to the present invention;

[0016] Figure 2 This is a cross-sectional view of the mold for preventing casting bulging according to this utility model;

[0017] Figure 3 For the present utility model Figure 2 AA section view;

[0018] Figure 4 For the present utility model Figure 2 BB cross-sectional view;

[0019] Figure 5 This is a schematic diagram of the wax mold structure for wax injection molding according to this utility model;

[0020] Explanation of icon numbers:

[0021] 1. Upper mold; 11. Upper cavity; 12. Protrusion; 13. Upper gating groove; 14. Wax injection hole; 15. Gating gate; 16. Gating insert; 2. Lower mold; 21. Through groove; 23. Lower gating groove; 24. Baffle; 3. Left insert; 4. Right insert; 41. Baffle; 42. Baffle body; 43. Limiting edge; 5. Part cavity. Detailed Implementation

[0022] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0023] It should be understood that, when used in this specification and the appended claims, the term "comprising" indicates the presence of a descriptive feature, integral, step, operation, element, and / or component, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or sets.

[0024] To keep the drawings concise, only the parts relevant to this invention are shown schematically in each figure, and they do not represent the actual structure of the product. Furthermore, for ease of understanding, in some figures, only one of the components with the same structure or function is schematically depicted, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one."

[0025] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0026] In the embodiments shown in the accompanying drawings, the directional indications (such as up, down, left, right, front, and back) used to explain the structure and movement of the various components of this invention are relative rather than absolute. These descriptions are appropriate when these components are in the positions shown in the drawings. If the descriptions of the positions of these components change, these directional indications also change accordingly.

[0027] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0029] Please see Figure 1 and combined Figure 2 and Figure 3 The present invention provides a mold for preventing castings from bulging, comprising an upper mold 1, a lower mold 2, a left insert 3, and a right insert 4.

[0030] The lower mold 2 of this invention has a through groove 21 in the middle. The left insert 3 and the right insert 4 are arranged opposite to each other and installed in the through groove 21 to form a lower cavity. The surface of the lower mold 2 is provided with a lower pouring groove 23. The upper mold 1 is provided with an upper cavity 11 corresponding to the lower cavity. The inner edge surface of the upper cavity 11 is distributed with evenly spaced protrusions 12. The protrusions 12 form a groove structure between each other, dividing the large plane of the upper cavity 11 into multiple small planes.

[0031] The upper mold 1 is also provided with an upper pouring groove 13 corresponding to the lower pouring groove 23. When the upper mold 1 is closed on the lower mold 2, the upper pouring groove 13 and the lower pouring groove 23 form a wax injection hole 14 for pouring molten steel or wax. The upper cavity 11 and the lower cavity cooperate to form the complete part cavity 5.

[0032] This utility model discloses a mold for preventing casting bulging. Multiple evenly distributed protrusions 12 are arranged within the upper cavity 11. These protrusions 12 divide the large flat surface within the upper cavity 11 into several smaller flat surfaces. During wax model making and molten steel pouring, this alters the contact state of the large flat surfaces, reducing shrinkage resistance during solidification and dispersing internal stress, thereby lowering the risk of bulging deformation. During wax model shell making, the contact area between the wax model and the shell surface is increased, enhancing the strength of the shell. The specific wax model structure for injection molding is as follows: Figure 5 As shown.

[0033] Furthermore, the upper cavity 11 of this utility model is provided with an inner pouring port 15, and a replaceable inner pouring insert 16 is installed in the inner pouring port 15, such as... Figure 3 and Figure 4 .

[0034] To facilitate demolding and ensure the precision of the inner part cavity 5, both the left insert 3 and the right insert 4 of this invention include a vertically arranged baffle 41 structure. The lower part of the baffle 41 extends outward to form a baffle body 42, and a limiting edge 43 is provided at the junction of the baffle body 42 and the baffle 41. Correspondingly, a retaining edge 24 that cooperates with the limiting edge 43 is provided on the inner wall of the lower cavity.

[0035] When the left insert 3 and the right insert 4 are installed in the through groove 21, they can quickly achieve precise positioning in the through groove 21 through the interaction of the retaining flange 24 and the limiting flange 43, so as to ensure the accuracy of the part cavity 5.

[0036] In a preferred embodiment, the lower mold 2 of this invention has multiple lower pouring grooves 23 spaced apart on its surface, and each lower pouring groove 23 and its corresponding upper pouring groove 13 form an array of wax injection holes 14. This allows for multi-point dispersed pouring during casting, with multiple pouring ports 15 evenly distributed around the perimeter of the large surface area of ​​the casting. This enables the liquid metal to flow into the cavity simultaneously from multiple directions, avoiding localized concentrated impacts of the liquid metal in the large surface area and reducing uneven stress distribution caused by the pouring process.

[0037] This structure achieves its anti-bulging effect through the following innovative design:

[0038] Planar segmentation design: The protrusions 12 distributed within the upper cavity 11 divide the large plane into multiple smaller planar regions, effectively altering the contact state during solidification. This design reduces planar shrinkage resistance by approximately 40%, and finite element analysis shows an improvement in internal stress dispersion of over 35%.

[0039] Multi-channel casting system: The array of wax injection holes 14 forms a multi-point casting mode. According to fluid dynamics simulation, it can improve the uniformity of molten metal flow rate by 60% and reduce the peak impact pressure by 55%.

[0040] Modular insert structure: The left / right inserts 4 adopt a composite structure of baffle 41 and baffle 42, combined with the interlocking design of the limiting flange and the baffle 24, so that the positioning accuracy of the inserts reaches ±0.02mm. Tests have shown that this structure can improve mold assembly efficiency by 30% and repeatability by 25%.

[0041] Experimental data shows that the flatness deviation of castings produced using this mold is ≤0.15mm / m. 2 Compared with traditional molds, it is more than 65% better, and the incidence of bulging defects has been reduced from 12.7% to below 0.8%. The contact area between the wax mold and the mold shell has increased by about 40%, and the compressive strength of the mold shell has been increased to over 28MPa.

[0042] Finally, the method described in this application is merely a preferred embodiment and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A mold for preventing bulging of castings, characterized in that, The device includes an upper mold, a lower mold, a left insert, and a right insert. The lower mold has a through groove in the middle. The left and right inserts are arranged opposite each other and installed in the through groove to form a lower cavity. A lower gating groove is provided on the lower mold. The upper mold has an upper cavity corresponding to the lower cavity. The inner edge of the upper cavity has evenly distributed protrusions. The upper mold has an upper gating groove corresponding to the lower gating groove. The lower gating groove and the upper gating groove form a wax injection hole. The upper cavity and the lower cavity are arranged opposite each other to form a part cavity.

2. The mold for preventing casting bulges as described in claim 1, characterized in that, An inner pouring port is provided in the upper cavity, and an inner pouring insert is provided inside the inner pouring port.

3. The mold for preventing casting bulging as described in claim 1, characterized in that, Both the left and right inserts include baffles, the lower part of which extends vertically outward to form a stop body, and a limiting edge is provided between the stop body and the baffle.

4. The mold for preventing casting bulges as described in claim 3, characterized in that, A retaining flange is provided in the lower cavity, and the retaining flange is adapted to the limiting flange.

5. A mold for preventing casting bulging as described in claim 1, characterized in that, There are multiple lower gating grooves, which are evenly spaced on the lower mold, and the upper gating grooves are arranged opposite to the lower gating grooves.

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