Investment casting structure of evaporator rear cover

Abstract

The utility model discloses an evaporator rear cover investment casting structure. The evaporator rear cover investment casting structure comprises a tree assembling die head and two evaporator rear cover investment casting parts communicated with the tree assembling die head. The tree assembling die head comprises a pouring cup, a first pouring gate arranged in the X-axis direction, a plurality of wax discharging pipelines, a plurality of first inner pouring gates, an auxiliary pouring gate communicated with the first pouring gate and a plurality of second inner pouring gates. The sprue cup is communicated with the top of the runner I; one end of each dewaxing pipeline is communicated with the pouring cup, and the other end of each dewaxing pipeline is communicated with the pouring gate I; the runner I is communicated with the two evaporator rear cover investment casting parts through a plurality of flow gates I; the auxiliary pouring gate is communicated with the two evaporator rear cover investment casting parts through a plurality of inner sprues II; the auxiliary pouring gate comprises a pouring gate II arranged in the Z-axis direction and a pouring gate III arranged in the Y-axis direction; and the two ends of the pouring gate II are correspondingly communicated with the pouring gate I and the pouring gate III.

Description

Technical Field

[0001] The utility model relates to the technical field of investment casting, and particularly relates to an investment casting structure for an evaporator rear cover. Background Art

[0002] As a key component for refrigeration equipment manufacturers, the evaporator rear seat plays a crucial role. This component is usually made of a stainless steel blank, which not only requires specific structural functions but also meets high standards for surface finish, geometric shape accuracy, and material purity. The material is selected as 304 stainless steel to ensure the corrosion resistance and hygienic safety of the component, meeting the requirements of food refrigeration equipment.

[0003] In the existing casting process, to meet the above requirements, the casting process must be strictly controlled to ensure that the hot spots of the casting are fully compensated and any casting defects are avoided. However, traditional casting methods often have the following limitations:

[0004] 1. Porosity and inclusions are likely to appear inside the casting, affecting the quality and performance of the casting.

[0005] 2. The filling of the molten metal is uneven, resulting in non-uniform internal structure of the casting and affecting its mechanical properties.

[0006] 3. It is difficult to achieve precise casting for complex casting structures, especially for components with complex internal cavities and fine features.

[0007] 4. The yield rate of the casting process is low and the cost is high, which is not conducive to large-scale production and market competition.

[0008] 5. The design of the gating system is not optimized enough, resulting in insufficient compensation of the molten metal and prone to casting defects. Content of the Utility Model

[0009] In view of the problems existing in the prior art, the utility model provides an investment casting structure for an evaporator rear cover.

[0010] To achieve the above purpose, the technical solution of the utility model is as follows:

[0011] The utility model provides an investment casting structure for an evaporator rear cover, including: a tree mold head, and two investment casting parts of the evaporator rear cover communicated with the tree mold head;

[0012] The tree mold head includes a pouring cup, a first runner arranged along the X-axis direction, a plurality of wax draining pipes, a plurality of first ingates, an auxiliary runner communicated with the first runner, and a plurality of second ingates;

[0013] The pouring cup is communicated with the top of the first runner; one end of each wax draining pipe is communicated with the pouring cup, and the other end is communicated with the first runner;

[0014] The sprue 1 is connected to the investment casting parts of the two evaporator rear covers through a plurality of ingates 1; the auxiliary sprue is connected to the investment casting parts of the two evaporator rear covers through a plurality of ingates 2;

[0015] The auxiliary sprue includes a sprue 2 arranged along the Z-axis direction and a sprue 3 arranged along the Y-axis direction; both ends of the sprue 2 are correspondingly connected to the sprue 1 and the sprue 3.

[0016] Preferably, the pouring cup is connected to the middle part of the sprue 1.

[0017] Preferably, a plurality of the ingates 1 are arranged at both ends of the bottom of the sprue 1, and two ingates 1 are correspondingly arranged at each end of the bottom of the sprue 1.

[0018] Preferably, the sprue 2 is perpendicular to both the sprue 1 and the sprue 3, and the top of the sprue 2 is connected to the middle part of the sprue 1, and the bottom is connected to the middle part of the sprue 3.

[0019] Preferably, a plurality of the ingates 2 are arranged at both side ends of the sprue 3, and one ingate 2 is correspondingly arranged at each side end of the sprue 3.

[0020] Preferably, the ingate 1 is correspondingly connected to the top of the investment casting part of the evaporator rear cover, and the ingate 2 is correspondingly connected to one side of the bottom of the investment casting part of the evaporator rear cover.

[0021] Preferably, each investment casting part of the evaporator rear cover is connected to 2 ingates 1 and 2 ingates 2.

[0022] Preferably, both the ingate 1 and the ingate 2 are provided as wedge-shaped ingates with a slope.

[0023] Adopting the technical solution of the present utility model has the following beneficial effects:

[0024] By designing wedge-shaped ingates with a slope, the present utility model optimizes the flow direction of the molten metal, improves the filling efficiency, reduces turbulence and gas inclusions, designs the ingate 2 at the dispersed hot spots at the feet, enhances the feeding capacity of these areas, and reduces casting defects such as shrinkage cavities and porosity.

[0025] The present utility model improves the production rate and cost-effectiveness: using a 40*40 flat die head group-welded wax part, realizing the layout of 2 products in one tree group, improving the process production rate and reducing the unit cost.

[0026] The optimized design of the wax removal channel of the present utility model ensures the complete removal of the investment casting wax, avoids gas holes and slag holes in the casting, is also beneficial to environmental protection and cost control, effectively improves the internal and external quality of the casting, and meets the requirements of high precision and high reliability. Description of the Drawings

[0027] Figure 1 This is a schematic structural view of the present utility model;

[0028] Figure 2 This is a schematic structural view of the present utility model

[0029] Figure 3 This is a top view of the structure of the present utility model;

[0030] Figure 4 This is a front view of the structure of the present utility model;

[0031] Figure 5 This is a bottom view of the structure of the present utility model. Specific embodiments

[0032] The following details the embodiments of the present utility model. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present utility model and should not be construed as limiting the present utility model.

[0033] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

[0034] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality" means two or more unless otherwise specifically defined.

[0035] In the present utility model, unless otherwise clearly specified and defined, terms such as "installation", "connection", "linkage", "fixation" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0036] In the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on the top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0037] Refer to

[0038] Referring to Figures 1 to 5 , the present utility model provides an evaporator rear cover investment casting, including: a tree mold head, and two evaporator rear cover investment casting parts 7 communicated with the tree mold head;

[0039] The tree mold head includes a pouring cup 1, a first runner 2 arranged along the X-axis direction, a plurality of wax draining pipes 3, a plurality of first ingates 4, an auxiliary runner 5 communicated with the first runner 2, and a plurality of second ingates 6;

[0040] Among them, the pouring cup is used for receiving and distributing molten material;

[0041] Among them, the first runner 2 arranged along the X-axis direction is used for transmitting the molten material from the pouring cup 1 to the casting part; the plurality of wax draining pipes 3 are used for discharging the wax in the mold head before casting, ensuring the complete removal of the investment wax and avoiding air holes and slag holes in the casting; the plurality of first ingates 4 are located at the main hot spots and are used for transmitting the molten material from the first runner 2 to the top of the evaporator rear cover investment casting part 7; the auxiliary runner 5 is used for providing an additional transmission path for the molten material; the plurality of second ingates 6 are located at the dispersed hot spots at the feet of the evaporator rear cover investment casting part 7 and are used for transmitting the molten material from the auxiliary runner to the bottom side of the evaporator rear cover investment casting part 7.

[0042] Furthermore, the sprue cup 1 is connected to the top of the first runner 2. The sprue cup 1 serves as the distribution center of the molten metal, and being connected to the top of the first runner 2 helps the molten metal to flow evenly into the first runner 2, and then evenly fill the evaporator rear cover investment casting 7, reducing casting defects. One end of each wax draining pipe 3 is connected to the sprue cup 1, and the other end is connected to the first runner 2. The wax drained through the wax draining pipe 3 can prevent the formation of air holes and inclusions when the molten metal is injected, improving the quality of the casting. The through holes on the rear cover investment casting 7 are made by ceramic cores 701, ensuring the dimensional accuracy and surface quality of the holes and meeting the fine machining requirements of complex castings.

[0043] The first runner 2 is connected to two evaporator rear cover investment castings 7 through a plurality of first ingates 4, which helps the molten metal to evenly fill each part of the casting. The first ingates 4 serve as the inlets for the molten metal to enter the casting, and their design helps to reduce the turbulence and oxidation during the flow of the molten metal, improving the internal quality of the casting. The auxiliary runner 5 is connected to two evaporator rear cover investment castings 7 through a plurality of second ingates 6. The auxiliary runner 5 includes a second runner 501 arranged along the Z-axis direction and a third runner 502 arranged along the Y-axis direction. The two ends of the second runner 501 are correspondingly connected to the first runner 2 and the third runner 502.

[0044] Furthermore, the sprue cup 1 is connected to the middle of the first runner 2. A plurality of the first ingates 4 are arranged at both ends of the bottom of the first runner 2, and two first ingates 4 are correspondingly arranged at each end of the bottom of the first runner 2. The second runner 501 is perpendicular to both the first runner 2 and the third runner 502, and the top of the second runner 501 is connected to the middle of the first runner 2, and the bottom is connected to the middle of the third runner 502. The vertical layout helps to maintain the structural stability of the gating system, reduce deformation during the casting process, and helps to improve the filling speed and efficiency of the molten metal.

[0045] Furthermore, a plurality of the second ingates 6 are arranged at both side ends of the third runner 502, and one second ingate 502 is correspondingly arranged at each side end of the third runner 502. This symmetrical layout helps the molten metal to evenly fill the casting, reducing defects caused by uneven flow. The first ingate 4 is correspondingly connected to the top of the evaporator rear cover investment casting 7, which helps the molten metal to fill the casting from the top, reducing air entrainment and oxidation. The second ingate 502 is correspondingly connected to one side of the bottom of the evaporator rear cover investment casting 7, ensuring that the molten metal can reach the bottom area of the casting and achieve full filling. Each evaporator rear cover investment casting 7 is connected to 2 first ingates 4 and 2 second ingates 6, forming multi-point liquid inlet, improving the filling efficiency and the integrity of the casting.

[0046] Furthermore, both the first ingate 4 and the second ingate 5 are provided as wedge-shaped ingates with a slope. The slope of the wedge-shaped ingate helps to guide the molten metal into the casting more smoothly, reduce the flow resistance, and improve the filling efficiency.

[0047] The slope design helps the molten metal to discharge air when entering the mold, thereby reducing the formation of pores and other defects; the slope of the wedge-shaped ingate helps to provide better feeding during the cooling process of the casting and reduce the defects caused by uneven shrinkage.

[0048] Working principle of the present utility model:

[0049] First, the wax in the die head is discharged through the wax discharge pipe 3 to ensure the cleanliness of the die head and provide space for the injection of molten metal. Then, the molten metal is injected from the sprue cup 1. The molten metal enters the top of the casting through the first runner 2 and the first ingate 4. At the same time, the molten metal also enters the bottom of the casting through the second runner 501 and the third runner 502 of the auxiliary runner 5, and the second ingate 6. Wait for the molten metal to cool and solidify in the mold to form the required shape of the evaporator rear cover.

[0050] The above are only the preferred embodiments of the present utility model, and do not limit the patent scope of the present utility model. Any equivalent structural transformation made under the inventive concept of the present utility model by using the content of the specification and drawings of the present utility model, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present utility model.

Claims

1. An evaporator rear cover investment casting structure, characterized in that: include: A tree assembly die head and two evaporator rear cover investment castings connected to the tree assembly die head; The group tree die head includes a pouring cup, a runner 1 arranged along the X-axis direction, a plurality of wax discharge pipes, a plurality of ingate 1s, an auxiliary runner connected to the runner 1, and a plurality of ingate 2s; The pouring cup is connected to the top of the pouring channel; one end of each of the wax discharge pipes is connected to the pouring cup, and the other end is connected to the pouring channel; The runner 1 is connected to the two evaporator rear cover investment castings through multiple ingates 1; the auxiliary runner is connected to the two evaporator rear cover investment castings through multiple ingates 2; The auxiliary runner includes a runner 2 arranged along the Z-axis direction and a runner 3 arranged along the Y-axis direction; both ends of the runner 2 are correspondingly connected to the runner 1 and the runner 3.

2. The evaporator rear cover investment casting structure according to claim 1, characterized in that: The pouring cup is communicated with the middle part of the pouring channel 1.

3. The evaporator rear cover investment casting structure according to claim 2, characterized in that: The plurality of inner gates 1 are arranged at two ends of the bottom of the runner 1, and two inner gates 1 are correspondingly arranged at each end of the bottom of the runner 1.

4. The evaporator rear cover investment casting structure according to claim 3, characterized in that: The runner 2 is perpendicular to the runner 1 and the runner 3, and the top of the runner 2 is connected to the middle of the runner 1, and the bottom is connected to the middle of the runner 3.

5. The evaporator rear cover investment casting structure according to claim 4, characterized in that: The plurality of inner gates 2 are arranged at both side ends of the runner 3, and each side end of the runner 3 is correspondingly provided with an inner gate 2.

6. The evaporator rear cover investment casting structure according to claim 5, characterized in that: The first inner gate is correspondingly connected to the top of the evaporator rear cover investment casting, and the second inner gate is correspondingly connected to one side of the bottom of the evaporator rear cover investment casting.

7. The evaporator rear cover investment casting structure according to claim 6, characterized in that: Each of the evaporator rear cover investment castings is connected to two first ingates and two second ingates.

8. The evaporator rear cover investment casting structure according to claim 7, characterized in that: The first ingates and the second ingates are both configured as wedge-shaped ingates with an inclination.

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