Precision casting pouring system for pump cover piece of multi-stage pump
By designing a multi-gating cup-type casting system, the problems of porosity and air holes in the casting process of multi-stage pump cover parts were solved, achieving high-quality production of castings, improving the pass rate and surface quality, and reducing production costs.
Patent Information
- Application Number
- CN202423083833.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-13
- Publication Date
- 2025-12-12
- Estimated Expiration
- 2034-12-13
AI Technical Summary
Existing technologies make it difficult to avoid defects such as porosity and air holes in the precision casting process of multi-stage pump cover parts. The impact of molten alloy causes the shell surface layer to fall off and the cavity size to deform. In particular, gas is difficult to escape in large flat areas, resulting in a decrease in the surface quality of the casting and a decrease in the pass rate.
A hybrid (top-injection + side-injection) gating system with multiple gating cups is adopted, with a cross gating and an inner gate. The alloy liquid is rationally distributed through the multiple gating cups to reduce the impact on the inside of the shell and ensure gas discharge, especially for hot spots.
It improved the pass rate and surface quality of castings, reduced porosity defects and fire defects, enhanced the operability and production efficiency of castings, and reduced production costs.
Smart Images
Figure CN223655977U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to precision casting technical field especially relates to a multistage pump pump cover piece precision casting pouring system. BACKGROUND
[0002] The FDD type heavy station petrochemical process pump is designed according to the API610 11th standard requirement, the pump of this series is strictly designed according to the standard in the cavity structure etc., and the quality requirement of key parts is higher. The multistage pump cover piece is the key part connected with the pump body, the size is thick, the structure is more complex than other types of castings, after dewaxing, the internal structure of the shell is also more complex. At present, the precision casting process is used for production, for the conventional pouring system, it is difficult to achieve stable filling, and the casting is prone to defects such as loose and porosity, and the alloy liquid has a large impact force, directly impacts the internal cavity during pouring, resulting in the shell surface layer falling off and the cavity size deformation. For the pump cover piece with large plane, the gas is difficult to escape during pouring, resulting in the reduction of the surface quality of the casting and the decrease of the product qualification rate. SUMMARY
[0003] The utility model aims at solving above-mentioned technical problem, provides a multistage pump pump cover piece precision casting pouring system.
[0004] In order to realize the above technical purpose, reach the technical requirement of above, the utility model adopts the technical scheme, a multistage pump pump cover piece precision casting pouring system, including first sprue, the first sprue top is provided with a plurality of sprue cups, the first sprue below is provided with a plurality of second sprue, first inner gate, the second sprue inside lower part is provided with second inner gate, the first inner gate, second inner gate is connected with casting respectively.
[0005] It is preferred that the plurality of sprue cups are communicated with the first sprue and are distributed in a cross shape, the number of the sprue cups is at least two, and the center line of the sprue cups is located between the first inner gate and the second sprue.
[0006] It is preferred that the first sprue is in a cross shape.
[0007] It is preferred that the second sprue is located at the side of the casting, the second sprue is communicated with the first sprue, the distance between the second sprue and the casting is 10-20 mm, and the number of the second sprues is at least two.
[0008] It is preferred that the first inner gate is located above the casting, the first inner gate is communicated with the first sprue, the number of the first inner gates is at least two, and the first inner gates are distributed in a circumferential cross shape.
[0009] Preferably, the second ingates are located at the side of the casting, and the second ingates are communicated with the second sprues, and the number of the second ingates is at least two.
[0010] Compared with the traditional structure, the utility model has the beneficial effects that:
[0011] 1. Compared with the traditional integral casting, since the casting is large, the utility model adopts the mixed type (top pouring type + side pouring type) pouring system of the multi-gate cup, which is more beneficial to the on-site operation while ensuring the quality of the casting, greatly improves the operability of the casting in the production process, and improves the qualified rate of the casting.
[0012] 2. Compared with the traditional pouring system, the utility model adopts the design idea of the multi-gate cup feeding pouring system, uses the cross gate in the design, effectively feeds the various hot section parts of the casting, eliminates the generation of internal porosity defects of the casting, reasonably discharges the gas, avoids the difficulty of gas escaping in the large plane position, and improves the qualified rate of the casting.
[0013] 3. The alloy liquid can effectively reduce the direct impact on the inside of the casting shell during pouring, realizes reasonable shunting of the alloy liquid, and avoids the phenomenon of fire running in the groove part of the casting due to large impact force, thereby causing the casting to be scrapped.
[0014] 4. The design of the side ingate ensures sufficient feeding of the hot section part at the bottom of the casting, solves the porosity defect at this position of the casting in the past, and improves the qualified rate of the casting.
[0015] 5. The utility model adopts the mixed type pouring system and the feeding mode of the multi-gate cup, and can be applicable to most various specifications of multi-stage pump covers, can ensure the surface and internal quality, and has high casting qualified rate. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 is the front view of the utility model;
[0017] Figure 2 is the top view of the utility model;
[0018] Figure 3 is Figure 2 A-A view of the utility model;
[0019] In the drawings: 1. Gate cup, 2. First sprue, 3. Second sprue, 4. First ingate, 5. Second ingate, 6. Casting. DETAILED DESCRIPTION
[0020] The utility model will be further described below.
[0021] Embodiment 1: A multi-stage pump cover precision casting gating system, comprising a first sprue 2, a plurality of sprue cups 1 arranged above the first sprue 2, a plurality of second sprues 3 and first ingates 4 arranged below the first sprue 2, and second ingates 5 arranged below the inner sides of the second sprues 3, wherein the first ingates 4 and the second ingates 5 are connected to a casting 6.
[0022] In the preferred embodiment, the first sprue 2 is arranged in a "cross" shape.
[0023] In the preferred embodiment, the plurality of sprue cups 1 are connected to the first sprue 2 and arranged in a "cross" shape, and the number of sprue cups 1 is four, and the center line of the sprue cup 1 is located between the first ingate 4 and the second sprue 3.
[0024] In the preferred embodiment, the second sprue 3 is located on the side of the casting 6, and the distance between the second sprue 3 and the casting 6 is 15 mm, and the second sprue 3 is connected to the first sprue 2, and the number of second sprues 3 is three.
[0025] In the preferred embodiment, the first ingate 4 is located above the casting 6, and the first ingate 4 is connected to the first sprue 2, and the number of first ingates 4 is four.
[0026] In the preferred embodiment, the second ingate 5 is located on the side of the casting 6, and the second ingate 5 is connected to the second sprue 3, and the number of second ingates 5 is three.
[0027] In specific implementation, the first sprue 2 is in a "cross" shape, which provides sufficient filling pressure for alloy liquid into the cavity and provides sufficient feeding for the hot nodes in the flow channel of the casting 6. When designing the first sprue 2, S ingate, S sprue, and S runner are adopted in a ratio of 1:2:1.2, and the ratio of (H sprue+H ingate) to the width of D ingate is 1.8, so that the size reaches the optimal data ratio after calculation.
[0028] The multi-sprue cup type is adopted, four sprue cups 1 are connected to the first sprue 2, compared with the traditional single-sprue cup gating system, the feeding of the upper and bottom flange positions of the pump cover is fully guaranteed, and the alloy liquid can be well slowed down to wash the casting cavity, so that the casting cavity is filled smoothly, the problems such as surface layer falling off, casting size deformation, casting groove fire, and unclear product identification are avoided, the surface appearance quality of the casting is greatly improved, and the qualified rate and cost rate of the casting are also greatly improved.
[0029] 4 first inner gates 4 are connected with the casting 6, which are designed at a certain angle, the draft angle is 3°, which provides necessary filling pressure and fully guarantees the feeding of the upper flange and the adapter hot spot part, provides sufficient filling pressure for the alloy liquid into the cavity, and also increases the feeding effect of the alloy liquid, improves the qualified rate of the casting.
[0030] 3 second inner gates 5 are connected with the second sprue 3 and the casting 6 respectively, so that the alloy liquid fills the mold stably through the second sprue 3, the alloy liquid is slowed down to wash the casting cavity, the surface layer falling off caused by washing the cavity is avoided, the size of the casting is deformed, the design of the draft angle is 5°, which fully guarantees the feeding of the bottom flange and the adapter hot spot part, and greatly improves the qualified rate of the casting; and it is beneficial to fully discharge the gas in the cavity, avoids the problem that the gas is difficult to escape in the plane position, and improves the quality of the casting.
[0031] The utility model discloses a multistage pump cover piece precision casting pouring system, compared with ordinary pouring system has great advantage.
[0032] 1) from the production process: adopt the mixed type (top injection type + side injection type) pouring system of multiple gate cup, since the casting is larger, this design is more beneficial to the scene operation while guaranteeing the quality of the casting. While guaranteeing the quality of the casting, the qualified rate of the product is improved, the production cost is saved, and the production efficiency is improved.
[0033] 2) from the pouring system design idea: adopt the pouring system design idea of multiple gate cup feeding, use cross runner when designing, which plays an effective feeding role for each hot spot part of the casting, prevents the generation of internal porosity defects of the casting, reasonably discharges gas, avoids the problem that the gas is difficult to escape in the large plane position, and improves the qualified rate of the casting.
[0034] 3) from the structure involved: applicable to the precision casting pouring system and production process of most different specifications multistage pump cover, can fully guarantee the external and internal quality of the casting, has higher economic benefit and long-term application prospect.
[0035] The above embodiments of the utility model only clearly illustrate the examples made by the utility model, but are not used to limit the protection scope of the utility model, all equivalent technical schemes also belong to the scope of the utility model, and the patent protection scope of the utility model should be limited by various claims.
Claims
1. A precision casting gating system for a multi-stage pump cover, characterized in that: It includes a first sprue (2), several pouring cups (1) are provided above the first sprue (2), several second sprues (3) and a first ingate (4) are provided below the first sprue (2), and a second ingate (5) is provided on the inner side of the second sprue (3). The first ingate (4) and the second ingate (5) are respectively connected to the casting (6).
2. The precision casting and gating system for the multi-stage pump cover as described in claim 1, characterized in that: Several of the pouring cups (1) are connected to the first sprue (2) and are arranged in a "cross" shape. The number is set to at least 2. The center line of the pouring cups (1) is located between the first ingate (4) and the second sprue (3).
3. The precision casting gating system for the multi-stage pump cover as described in claim 1, characterized in that: The first straight gating channel (2) is set in a "cross" shape.
4. The precision casting gating system for multi-stage pump cover parts according to claim 1, characterized in that: The second sprue (3) is located on the side of the casting (6). The second sprue (3) is connected to the first sprue (2). The distance between the second sprue (3) and the casting (6) is 10-20 mm, and the number is at least 2.
5. The precision casting gating system for multi-stage pump cover parts according to claim 1, characterized in that: The first ingate (4) is located above the casting (6), and the first ingate (4) is connected to the first straight runner (2), with a minimum of 2 ingates.
6. The precision casting gating system for multi-stage pump cover parts according to claim 1, characterized in that: The second ingate (5) is located on the side of the casting (6), and the second ingate (5) is connected to the second sprue (3), and the number is set to at least 2.