A gating system for controlling the porosity defects of a complex multi-nodal stainless steel impeller precision casting

Abstract

The utility model relates to impeller casting field especially to control complex many hot node stainless steel impeller precision casting loose defect's pouring system, including casting mould, be provided with cavity in casting mould, still include sprue cup and at least three transverse gates, and the bottom of transverse gate and sprue cup intercommunication, three transverse gates are in the same plane, and the included angle between any two adjacent transverse gates is consistent, the bottom surface of transverse gate is provided with outer ring ingate and inner ring ingate, and outer ring ingate and inner ring ingate all with cavity intercommunication, and the distance between outer ring ingate and sprue cup is greater than the distance between inner ring ingate and sprue cup. The utility model discloses through setting up multiple evenly arranged transverse gates and the setting of inner ring ingate and outer ring ingate, can pour the impeller from the outer ring and the inner ring, makes the inside and outside uniform in the pouring process, reduces isolated liquid phase area and cavity, thereby improves the quality of the product obtained by pouring.

Description

Technical Field

[0001] This utility model relates to the field of impeller casting, and in particular to a gating system for controlling porosity defects in precision castings of complex stainless steel impellers with multiple heat points. Background Technology

[0002] As a core component of multistage centrifugal pumps, stainless steel impellers require high precision, high strength, and corrosion resistance. Traditional gating systems struggle to accommodate the complex structure of impellers, especially in thick-walled areas such as blade roots and hubs, where isolated liquid phase zones can easily form, leading to casting defects such as porosity and shrinkage cavities. Furthermore, existing technologies suffer from a single molten metal flow path, resulting in uneven flow within the mold cavity, low feeding efficiency, and an inability to meet high density requirements.

[0003] Therefore, we urgently need a composite casting system suitable for multi-heat-section impeller structures to achieve multi-directional synchronous filling and shrinkage compensation in order to overcome the above-mentioned defects. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a casting system for controlling porosity defects in precision castings of complex, multi-heat-section stainless steel impellers. This invention is achieved through the following technical solution:

[0005] A gating system for controlling porosity defects in precision castings of complex multi-heat-section stainless steel impellers includes a casting mold with a cavity, a pouring cup, and at least three runners. The runners are connected to the bottom of the pouring cup, and the three runners are in the same plane with the same included angle between any two adjacent runners. An outer ring ingate and an inner ring ingate are provided on the bottom surface of the runners. Both the outer ring ingate and the inner ring ingate are connected to the cavity, and the distance between the outer ring ingate and the pouring cup is greater than the distance between the inner ring ingate and the pouring cup.

[0006] In the above technical solution: the casting mold and cavity are used to determine the shape of the cast product; the pouring cup serves as a container for receiving molten metal; the runner serves as a channel for the molten metal to move to the outer ring ingate and the inner ring ingate; the three runners are evenly arranged so that the molten metal can be evenly distributed into the cavity; the arrangement of the outer ring ingate and the inner ring ingate allows the molten metal to fill the mold from the inside out and from the outside in together, reducing the generation of isolated liquid phase regions.

[0007] A further feature of this invention is that it includes an auxiliary gating system, one end of which is connected to the pouring cup and the other end of which is connected to the horizontal gating system.

[0008] In the above technical solution: the auxiliary gating system is used to increase the flow rate of molten metal between the pouring cup and the runner, so that the molten metal in the pouring cup can flow into the runner as quickly as possible.

[0009] A further feature of this invention is that the auxiliary gating channel is inclined.

[0010] In the above technical solution: the auxiliary gating channel is inclined to accelerate the flow rate of the molten metal by gravity.

[0011] A further feature of this invention is that the horizontal runner includes a first part and a second part, one end of the first part is connected to the second part, the other end is connected to the pouring cup, and the bottom surface of the first part is lower than the bottom surface of the second part.

[0012] A further feature of this invention is that the inner ring inlet is disposed on the bottom surface of the first part, and the outer ring inlet is disposed on the bottom surface of the second part.

[0013] In the above technical solution: the first part and the second part are set up to cooperate in setting the inner ring ingate and the outer ring ingate, so as to facilitate the inflow of molten metal; the bottom surface of the first part is lower than the bottom surface of the second part, so that the molten metal from the pouring cup to the horizontal runner will be preferentially poured into the inner ring through the inner ring ingate by the first part.

[0014] A further feature of this invention is that the auxiliary gating channel is connected to the second part.

[0015] In the above technical solution: the second part is connected by an auxiliary gating system, so that after the molten metal reaches the horizontal gating system from the auxiliary gating system, it will first enter the second part and then be poured into the outer ring by preferentially passing through the inner gating system of the outer ring.

[0016] A further feature of this invention is that a straight pouring channel is provided at the bottom of the pouring cup, and the horizontal pouring channel is connected to the bottom of the straight pouring channel.

[0017] In the above technical solution: the sprue is used to collect the molten metal and then distribute it evenly to each sprue, so that the flow rate of the molten metal in each sprue is more uniform.

[0018] This utility model discloses a casting system for controlling porosity defects in precision castings of complex, multi-heat-section stainless steel impellers, which, compared with the prior art:

[0019] 1. This utility model, by setting multiple uniformly arranged horizontal runners, enables more uniform pouring of the impeller. Furthermore, by setting inner and outer ring runners, the impeller can be poured from both the outer and inner rings, resulting in uniform pouring both inside and outside the ring, reducing isolated liquid phase areas and cavities, thereby improving the quality of the poured product.

[0020] 2. The present invention also ensures that the molten metal in the outer ring inner gating can be replenished in a timely manner through the setting of the first part, the second part and the auxiliary gating, while the flow rate of the molten metal in the inner ring inner gating will not be affected, thus ensuring a smooth pouring process. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the present invention;

[0022] Figure 2 This is a schematic diagram of the horizontal gating system of this utility model.

[0023] The numbers and letters in the diagram represent the following component names: 10-casting mold; 20-pour cup; 30-sprue; 301-first part; 302-second part; 40-outer ring ingate; 50-inner ring ingate; 60-auxiliary runner; 70-sprue. Detailed Implementation

[0024] The embodiments of this utility model are described in detail below. These embodiments are implemented based on the technical solution of this utility model and provide detailed implementation methods and specific operation processes. However, the protection scope of this utility model is not limited to the following embodiments.

[0025] like Figure 1 and 2 As shown, this utility model proposes a gating system for controlling porosity defects in precision castings of complex multi-heat-section stainless steel impellers. The system includes a casting mold 10 with a cavity, a pouring cup 20, and at least three runners 30. Each runner 30 is connected to the bottom of the pouring cup 20. The three runners 30 are located in the same plane, and the included angle between any two adjacent runners 30 is the same. An outer ring ingate 40 and an inner ring ingate 50 are provided on the bottom surface of each runner 30. Both the outer ring ingate 40 and the inner ring ingate 50 are connected to the cavity, and the distance between the outer ring ingate 40 and the pouring cup 20 is greater than the distance between the inner ring ingate 50 and the pouring cup 20. Preferably, there are three runners 30; the width of the outer ring ingate 40 is greater than the width of the runners 30, and the width of the inner ring ingate 50 is also greater than the width of the runners 30.

[0026] like Figure 1 and 2 As shown, the present invention proposes a gating system for controlling porosity defects in stainless steel impeller precision castings with complex heat nodes, which also includes an auxiliary gating system 60. One end of the auxiliary gating system 60 is connected to the pouring cup 20, and the other end is connected to the horizontal gating system 30.

[0027] like Figure 1 and 2As shown, this utility model proposes a gating system for controlling porosity defects in precision castings of complex, multi-heat-section stainless steel impellers, wherein the auxiliary gating channel 60 is inclined. Preferably, the inclination angle of the auxiliary gating channel 60 is 45 degrees.

[0028] like Figure 1 and 2 As shown, this utility model proposes a gating system for controlling porosity defects in precision castings of complex, multi-heat-section stainless steel impellers. The horizontal runner 30 includes a first part 301 and a second part 302. One end of the first part 301 is connected to the second part 302, and the other end is connected to the pouring cup 20. The bottom surface of the first part 301 is lower than the bottom surface of the second part 302. The first part 301 and the second part 302 are integrally formed.

[0029] like Figure 1 and 2 As shown, this utility model proposes a casting system for controlling porosity defects in precision castings of stainless steel impellers with complex heat nodes. The inner ring ingate 50 is disposed on the bottom surface of the first part 301, and the outer ring ingate 40 is disposed on the bottom surface of the second part 302.

[0030] like Figure 1 and 2 As shown, this utility model proposes a gating system for controlling porosity defects in precision castings of stainless steel impellers with complex multiple heat points, wherein the auxiliary gating channel 60 is connected to the second part 302.

[0031] like Figure 1 and 2 As shown, this utility model proposes a casting system for controlling porosity defects in precision castings of complex, multi-heat-section stainless steel impellers. The bottom of the pouring cup 20 is provided with a sprue 70, and the horizontal runner 30 is connected to the bottom of the sprue 70. The sprue 70 has a circular cross-section to ensure that the flow rate of molten metal distributed to each horizontal runner 30 is as equal as possible.

[0032] The working principle of this utility model is as follows:

[0033] a) Pour the molten metal into the pouring cup;

[0034] b) Part of the molten metal flows from the pouring cup into the sprue, and part of the molten metal flows from the auxiliary gating into the second part of the runner; c) The molten metal flows from the sprue into the first part of the runner;

[0035] d) The molten metal in the first part flows into the inner ring of the mold from the inner ring inlet and fills the mold, and the molten metal in the mold spreads to the outer ring;

[0036] e) The molten metal in the second part flows into the outer ring of the mold from the inner gate of the outer ring and fills the mold. This part of the molten metal spreads to the inner ring of the mold and merges with another part of the molten metal, so that the mold is completely filled.

[0037] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

[0038] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A gating system for controlling the porosity defects of a complex multi-nodal stainless steel impeller precision casting, comprising a casting mold (10) provided with a cavity in the casting mold (10), characterized in that: The gate cup (20) and at least three cross runners (30) are further included, the cross runners (30) are communicated with the bottom of the gate cup (20), three cross runners (30) are in the same plane, and the included angle between any two adjacent cross runners (30) is consistent, the bottom surface of the cross runner (30) is provided with an outer circle inner runner (40) and an inner circle inner runner (50), the outer circle inner runner (40) and the inner circle inner runner (50) are communicated with the cavity, and the distance between the outer circle inner runner (40) and the gate cup (20) is greater than the distance between the inner circle inner runner (50) and the gate cup (20), and an auxiliary runner (60) is further included, one end of the auxiliary runner (60) is connected with the gate cup (20), the other end is connected with the cross runner (30), the auxiliary runner (60) is inclinedly arranged, the cross runner (30) includes a first part (301) and a second part (302), one end of the first part (301) is connected with the second part (302), the other end is connected with the gate cup (20), and the bottom surface of the first part (301) is lower than the bottom surface of the second part (302).

2. The gating system for controlling the porosity defects of a complex multi-nodal stainless steel impeller investment casting according to claim 1, characterized in that: The inner circle inner runner (50) is arranged on the bottom surface of the first part (301), and the outer circle inner runner (40) is arranged on the bottom surface of the second part (302).

3. The gating system for controlling the porosity defects of a complex multi-nodal stainless steel impeller investment casting according to claim 2, characterized in that: The auxiliary runner (60) is communicated with the second part (302).

4. The gating system for controlling the porosity defects of a complex multi-nodal stainless steel impeller investment casting according to claim 3, characterized in that: The bottom of the gate cup (20) is provided with a straight runner (70), and the cross runner (30) is communicated with the bottom of the straight runner (70).

Images