Lightweight pouring system for investment casting

Abstract

The light-weight pouring system for investment casting comprises a pouring cup, a sprue and a sand collecting groove which are connected in sequence, a plurality of cross gates are arranged in the length direction of the sprue at intervals, the output ends of the cross gates are communicated with a plurality of ingates, the pouring cup is connected with the sprue, a molten steel buffer area is arranged on the pouring cup, and the sand collecting groove is communicated with the molten steel buffer area. And the sand collecting tank is arranged at the bottom of the sprue. According to the light-weight pouring system for investment casting, the molten steel buffer area is arranged on the pouring cup, so that the flow speed and the impact force of molten metal are reduced after the molten metal is guided into the pouring cup, the impact damage to the inner wall of the pouring system can be reduced, and the pouring cup is prevented from being separated from the sprue. Furthermore, in order to improve the connection strength between the pouring cup and the sprue, an exhaust reinforcing rib is arranged between the sprue and the pouring cup, so that the process yield is further improved, the strength of the pouring system is improved, the production cost is reduced, and the production efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of investment casting technology, and more specifically, to a lightweight gating system for investment casting. Background Technology

[0002] The gating system is a series of channels that guide molten metal into the mold cavity during the casting process. It usually consists of the pouring cup, sprue, gating system, and ingate.

[0003] This conventional gating system design is characterized by its simple structure and convenient, rapid production. However, the large cross-section between the pouring cup and the main runner, runner, and ingate, coupled with excessively high molten steel flow rates, makes it prone to entrapment of gas and impurities. This results in defects such as porosity, shrinkage cavities, and looseness inside the casting. Analysis using simulated gating software closely matches the actual internal structure, indicating that this process cannot guarantee the internal quality requirements of the casting. Furthermore, this type of gating system is relatively heavy and prone to breakage, which not only affects production efficiency and increases production costs but may also lead to casting quality defects. The specific structure is as follows: Figure 1 As shown.

[0004] Therefore, it is necessary to propose a lightweight gating system for investment casting to solve the above problems. Utility Model Content

[0005] This invention provides a lightweight gating system for investment casting to solve the problems of existing gating systems being heavy and prone to gate breakage, which seriously affects the casting quality.

[0006] According to one aspect of the present invention, a lightweight gating system for investment casting is provided, comprising a pouring cup, a sprue, and a sand collection trough connected in sequence. The sprue has multiple horizontal runners spaced apart along its length, and the output end of the horizontal runner is connected to multiple ingates. The pouring cup is connected to the sprue, and a molten steel buffer zone is provided on the pouring cup. The sand collection trough is located at the bottom of the sprue.

[0007] Based on the above scheme, preferably, the inner diameter of the molten steel buffer zone is smaller than the inner diameter of the pouring cup and the inner diameter of the direct sprue.

[0008] Based on the above scheme, preferably, an venting reinforcing rib is provided on the outer side of the horizontal runner near the pouring cup, and the other end of the venting reinforcing rib is connected to the outer edge surface of the pouring cup.

[0009] Based on the above scheme, the preferred embodiment is that the horizontal gating system is arranged symmetrically on the vertical gating system with respect to the center of the vertical gating system.

[0010] Based on the above scheme, the preferred embodiment is that the pouring cup is conical, and a weight-reducing groove is provided on the outer edge surface of the pouring cup near the straight runner.

[0011] Based on the above scheme, preferably, the weight reduction grooves are multiple and evenly spaced on the outer edge surface of the pouring cup.

[0012] This invention discloses a lightweight investment casting gating system. A molten steel buffer zone is incorporated into the pouring cup to reduce the flow rate and impact force of the molten metal after it enters the cup, thereby minimizing impact damage to the inner wall of the gating system and preventing the pouring cup from detaching from the sprue. Furthermore, to enhance the connection strength between the pouring cup and the sprue, this invention also incorporates venting and reinforcing ribs between the sprue and the pouring cup, further improving the yield rate, increasing the strength of the gating system, reducing production costs, and increasing production efficiency. Attached Figure Description

[0013] 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:

[0014] Figure 1 This is a schematic diagram of the existing casting system of this utility model;

[0015] Figure 2 This is a structural diagram of the lightweight gating system for investment casting of this utility model;

[0016] Explanation of icon numbers:

[0017] 1. Pour cup; 2. Molten steel buffer zone; 3. Straight sprue; 4. Venting reinforcement rib; 5. Weight reduction groove; 6. Horizontal sprue; 7. Ingate; 8. Sand collection groove. Detailed Implementation

[0018] 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.

[0019] 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.

[0020] 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."

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] Please see Figure 2 The present invention discloses a lightweight gating system for investment casting, comprising a pouring cup 1, a sprue 3, and a sand collection trough 8 connected in sequence. The sprue 3 has multiple horizontal runners 6 spaced apart along its length. The output end of the horizontal runners 6 is connected to multiple ingates 7. The pouring cup 1 is connected to the sprue 3, and a molten steel buffer zone 2 is provided on the pouring cup 1. The sand collection trough 8 is located at the bottom of the sprue 3.

[0026] The pouring cup 1 is located at the front end of the pouring system and is used to receive the liquid metal from the ladle. It can not only slow down the flow rate of the liquid metal and make it flow smoothly into the sprue 3, but also play a role in slag blocking and buffering. It should be noted that the pouring cup 1 is preferably designed in a conical shape to improve its buffering effect. A weight reduction groove 5 is provided on the outer edge surface of the pouring cup 1 near the sprue 3 to reduce its overall weight. Preferably, there are multiple weight reduction grooves 5 and they are evenly distributed on the outer edge surface of the pouring cup 1. The new pouring system is 20% lighter than the existing pouring system.

[0027] The sprue 3 of this invention connects the pouring cup 1 and the gating 6, guiding the liquid metal to flow vertically downwards. Utilizing the static pressure generated by its height, the molten metal can overcome resistance and smoothly fill various parts of the mold. The gating 6 is generally arranged horizontally, connecting the sprue 3 and the ingate 7. Its main function is to distribute the liquid metal, evenly distributing the molten metal flowing from the sprue 3 to each ingate 7. At the same time, it also serves to prevent slag and other impurities from entering the mold cavity.

[0028] The inner gating system 7 is the part of the gating system that is directly connected to the mold cavity. Its function is to introduce liquid metal into the mold cavity, control the flow rate and direction of the liquid metal, and enable the liquid metal to fill the mold cavity in a predetermined manner, avoiding defects such as sand erosion and air entrapment.

[0029] In use, the sprue cup 1 receives the molten metal from the ladle and guides it into the sprue 3. The sprue 3 is a vertically arranged channel that guides the molten metal in the sprue cup 1 to the runner 6, and uses the static pressure head generated by its height to ensure the filling pressure of the molten metal. The runner 6 distributes the molten metal from the sprue 3 to each ingate 7. The ingate 7 is directly connected to the mold cavity and controls the speed and direction of the molten metal entering the mold cavity.

[0030] The sprue 3 of this invention has a circular cross-section, the gating 6 has a trapezoidal cross-section, and the ingate 7 has a circular cross-section. The gating 6 and the ingate 7 are integrally connected. The corners and joints between the gating systems, where stress concentration is likely to occur, have their transition fillet radii increased, which can effectively alleviate stress concentration and improve the fracture resistance of the gating cup 1.

[0031] A molten steel buffer zone 2 is set in the gating system, and combined with a sand collecting trough 8 and an exhaust rib 4 set on the outside of the horizontal runner 6 near the pouring cup 1, and the molten steel buffer zone 2 is set in the middle of the pouring cup 1, so that the molten metal is buffered before entering the pouring cup 1, reducing its flow rate and impact force, and reducing impact damage to the inner wall of the pouring cup 1; the exhaust rib is connected to the pouring cup 1, providing a smooth exhaust channel for the gas in the cavity, preventing the generation of defects such as porosity; the sand collecting trough 8 is set at the bottom of the sprue 3, lower than the ingate 7, and can be used to collect and suck out residual sand and gravel with a vacuum cleaner before pouring, and can also prevent fine sand and gravel from being rolled into the casting cavity through the molten steel during pouring, forming casting defects such as sand holes.

[0032] Preferably, the inner diameter of the molten steel buffer zone 2 is smaller than the inner diameter of the pouring cup 1 and the inner diameter of the sprue 3, and the horizontal sprue 6 is symmetrically arranged on the sprue 3 with respect to the center of the sprue 3 to ensure more balanced force distribution.

[0033] This invention discloses a lightweight investment casting gating system. A molten steel buffer zone 2 is provided on the pouring cup 1 to reduce the flow rate and impact force of the molten metal after it is introduced into the pouring cup 1, thereby reducing impact damage to the inner wall of the gating system and preventing the pouring cup 1 from cracking from the sprue 3. Furthermore, to improve the connection strength between the pouring cup 1 and the sprue 3, this invention also provides venting reinforcing ribs 4 between the sprue 3 and the pouring cup 1, further improving the process yield, increasing the strength of the gating system, reducing production costs, and increasing production efficiency.

[0034] 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 lightweight gating system for investment casting, characterized in that, The system includes a pouring cup, a sprue, and a sand collection trough connected in sequence. Multiple horizontal runners are spaced apart along the length of the sprue, and the output ends of the horizontal runners are connected to multiple ingates. The pouring cup is connected to the sprue and has a molten steel buffer zone. The sand collection trough is located at the bottom of the sprue. Venting ribs are provided on the outer side of the horizontal runners near the pouring cup, and the other end of the venting ribs is connected to the outer edge of the pouring cup. The pouring cup is conical, and a weight-reducing groove is provided on the outer edge of the pouring cup near the sprue. The horizontal runners have a trapezoidal cross-section, and the ingates have a circular cross-section. The horizontal runners and ingates are integrally connected.

2. The lightweight gating system for investment casting as described in claim 1, characterized in that, The inner diameter of the molten steel buffer zone is smaller than the inner diameter of the pouring cup and the inner diameter of the sprue.

3. The lightweight gating system for investment casting as described in claim 1, characterized in that, The horizontal gating system is symmetrically arranged on the vertical gating system with respect to the center of the vertical gating system.

4. The lightweight gating system for investment casting as described in claim 1, characterized in that, The weight-reducing grooves are multiple and evenly spaced on the outer edge surface of the pouring cup.

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