Casting temperature field and solidification sequence regulation and control system and casting method
The castings are quickly cooled through the coolant storage box and the submersible pump system, and the solidification sequence of the castings is adjusted, which solves the casting defects and operation difficulty caused by the use of cold iron, and achieves an efficient shrinkage effect.
Patent Information
- Application Number
- CN202510944722.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-09
- Publication Date
- 2025-08-19
AI Technical Summary
During the traditional casting process, cold iron has defects such as pores, cold partitions, insufficient pouring, and cold cracks. It is difficult to operate and costly, especially in opposite-sex structures and 3D-printed sand types.
The coolant storage box, submersible pump and cooling box system are used to quickly cool the castings through coolant, adjust the solidification order of the castings, and cool the thick parts of the castings first to ensure smooth retraction channels.
Reduce the use rate of cold iron, reduce defects, reduce operation difficulty and cost, improve process yield, and achieve sequential solidification and replenishment efficiency.
Smart Images
Figure CN120502683A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of sand casting, and more particularly to a casting temperature field and solidification sequence control system and a casting method. Background Art
[0002] During the sand casting process, risers are used to feed the solidification shrinkage of the casting to eliminate defects such as shrinkage cavities and porosity. Feeding with risers requires a smooth feeding channel in the casting and a suitable solidification sequence to produce qualified castings.
[0003] In traditional casting processes, chills are often used to chill local areas of the casting to accelerate the cooling rate of that area, thereby adjusting the overall solidification sequence of the casting. However, this method has many disadvantages, including: ① If there is moisture, oil or rust on the surface of the chill, these impurities may decompose under heat to produce gas during the pouring process, causing porosity defects in the chill of the casting, resulting in scrapping of the casting, and the early chill treatment will also increase the workload; ② The chilling effect of the chill may reduce the fluidity of the molten metal, resulting in defects such as cold shut and insufficient pouring in the casting; ③ The chilling effect of the chill is limited by its size and casting structure. For castings with heterogeneous structures, it is often necessary to make conformable chills, which increases the difficulty of operation; ④ It is easy to cause defects such as chilling cracks, affecting the internal structure and performance of the casting; ⑤ In 3D printed sand molds, there are great difficulties in placing the chill; ⑥ The manufacturing cost of the formed chill is relatively high, and the chill needs to undergo surface treatment processes such as shot blasting and baking, which increases the production process and cost. The recycling and treatment of the chill after use is also more troublesome. If it is not managed well, it may cause waste of resources and increased costs.
[0004] Therefore, providing a casting temperature field and solidification sequence control system and casting method is an urgent problem that needs to be solved by those skilled in the art. Summary of the Invention
[0005] In view of this, the present invention provides a casting temperature field and solidification sequence control system and a casting method to control the casting temperature field and solidification sequence to ensure smooth feeding channels of risers in castings.
[0006] In order to achieve the above object, the present invention adopts the following technical solutions:
[0007] A casting temperature field and solidification sequence control system, comprising:
[0008] A coolant storage tank, wherein the coolant storage tank is used to store coolant;
[0009] a submersible pump, the submersible pump being placed in the coolant storage tank and communicating with the inner space thereof;
[0010] A cooling box is used to place sand molds and castings, and the submersible pump is connected to the cooling box through a pipeline.
[0011] By adopting the above technical solution, the beneficial effects of the present invention are:
[0012] By using coolant (external physical field) to quickly cool the casting as a whole or in part, the thick parts of the casting are cooled first, thereby regulating the solidification order of the casting from bottom to top, which is conducive to maintaining the smoothness of the shrinkage feeding channel and improving the shrinkage feeding efficiency of the riser.
[0013] Furthermore, it also includes a scale, which is vertically fixed on one side of the interior of the cooling box.
[0014] The beneficial effect of adopting the above-mentioned further technical solution is that the liquid level height can be adjusted according to the casting structure to meet different cooling requirements.
[0015] Furthermore, the submersible pump is a variable frequency submersible pump.
[0016] The beneficial effect of adopting the above-mentioned further technical solution is that the coolant injection flow rate can be controlled according to the different wall thicknesses of the castings to achieve the optimization of the cooling effect.
[0017] Furthermore, a drain valve communicating with the internal space of the cooling box is installed at the bottom of the cooling box.
[0018] Furthermore, a plurality of running wheels are installed on the bottom of the cooling box.
[0019] The beneficial effect of adopting the above further technical solution is that it is easy to move.
[0020] A casting method, using the casting temperature field and solidification sequence control system as described above, comprises the following steps:
[0021] First, pour coolant into the coolant storage tank and place the sand mold and casting in the center of the cooling tank; then start the submersible pump, and the coolant enters the cooling tank through the submersible pump and pipeline. During this process, the submersible pump controls the coolant injection speed and monitors the liquid level in real time through a scale. The coolant first submerges the bottom of the sand mold and casting, increasing the cooling rate of the bottom of the casting. Before the middle shrinkage feeding channel is closed, the bottom of the casting is fed. Then, as the coolant level rises, sequential solidification is completed from bottom to top.
[0022] It can be seen from this that the present invention provides a casting temperature field and solidification sequence control system and casting method. Compared with the existing technology, the present invention has the following beneficial effects:
[0023] (1) Reduce the utilization rate of chiller and reduce the cost of chiller;
[0024] (2) Reduce casting defects caused by the use of chill iron, such as cold shut, pores, cracks, etc.;
[0025] (3) Reduce the workload of chill production and chill post-processing, reduce operational difficulty, and improve efficiency;
[0026] (4) Achieve sequential solidification, reduce the use of risers and chills, and improve process yield. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.
[0028] Figure 1 The accompanying drawing is a schematic diagram of the three-dimensional structure of a casting temperature field and solidification sequence control system provided by the present invention;
[0029] Figure 2 The accompanying drawing is a main cross-sectional view of a casting temperature field and solidification sequence control system provided by the present invention. DETAILED DESCRIPTION
[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0031] like Figure 1-2 As shown, an embodiment of the present invention discloses a system for regulating the temperature field and solidification sequence of a casting, comprising a coolant storage tank 1, a submersible pump 2, and a cooling tank 3. The coolant storage tank 1 is used to store coolant; the submersible pump 2 is placed in the coolant storage tank 1 and is connected to the internal space thereof; the cooling tank 3 is used to place a sand mold 4 and a casting 5, and the submersible pump 2 is connected to the cooling tank 3 via a pipe 6. The present invention uses a coolant (external physical field) to rapidly cool the casting 5 as a whole or in part, so that the thick parts of the casting 5 are cooled first, thereby regulating the solidification sequence of the casting 5 from bottom to top, making it conducive to maintaining the smoothness of the shrinkage feeding channel and improving the shrinkage feeding efficiency of the riser.
[0032] In order to further optimize the technical solution of the present invention, a scale 7 is also included. The scale 7 is vertically fixed on one side of the inside of the cooling box 3. In this way, the liquid level can be monitored in real time by the scale 7, and the liquid level can be adjusted according to the structure of the casting 5 to meet different cooling requirements.
[0033] Specifically, the submersible pump 2 is a variable frequency submersible pump, which adjusts the rotation speed of the water pump by changing the frequency, so as to control the injection flow of the coolant according to the wall thickness of the different castings 5 to achieve the optimization of the cooling effect.
[0034] Specifically, a drain valve 8 communicating with the inner space of the cooling box 3 is installed at the bottom thereof.
[0035] Of course, the size of the cooling box 3 can be customized and the power of the submersible pump 2 can be adjusted according to the material and size of the casting 5.
[0036] In order to further optimize the technical solution of the present invention, a plurality of running wheels 9 are installed at the bottom of the cooling box 3 to facilitate movement.
[0037] The embodiment of the present invention further discloses a casting method, which is performed using the casting temperature field and solidification sequence control system as described above, and includes the following steps:
[0038] First, pour coolant into the coolant storage tank 1, and place the sand mold 4 and the casting 5 (the bottom of the casting 5 is thicker and larger. According to traditional casting simulation, there is a hot spot at the bottom, but the middle wall is thinner, and the upper riser cannot be effectively fed, resulting in defects such as shrinkage porosity and shrinkage cavities at the bottom) in the center of the cooling box 3; then start the submersible pump 2, and the coolant enters the cooling box 3 through the submersible pump 2 and the pipe 6. During this process, the submersible pump 2 controls the coolant injection speed and monitors the liquid level in real time through the scale 7. The coolant first submerges the bottom of the sand mold 4 and the casting 5, increasing the cooling rate of the bottom of the casting 5. Before the middle feeding channel is closed, the bottom of the casting 5 is fed, and then as the coolant level rises, the solidification is completed in a bottom-up order.
[0039] Of course, for different casting 5 structures, the thickness of the sand mold 4 and the cooling medium can be controlled to achieve the expected cooling effect. The type of sand mold 4 can also be controlled. Since different sand molds 4 have different thermal conductivities, the cooling rate of the casting 5 is different. For example, ceramsite sand is used in thick-walled parts and silica sand is used in thin-walled parts to meet the cooling rate requirements of the corresponding parts.
[0040] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.
[0041] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A casting temperature field and solidification sequence control system, characterized in that: include: A coolant storage tank, wherein the coolant storage tank is used to store coolant; a submersible pump, the submersible pump being placed in the coolant storage tank and communicating with the inner space thereof; A cooling box is used to place sand molds and castings, and the submersible pump is connected to the cooling box through a pipeline.
2. A casting temperature field and solidification sequence control system according to claim 1, characterized in that: It also includes a scale, which is vertically fixed on one side of the interior of the cooling box.
3. A casting temperature field and solidification sequence control system according to claim 1 or 2, characterized in that: The submersible pump is a variable frequency submersible pump.
4. A casting temperature field and solidification sequence control system according to claim 1, characterized in that: A drain valve communicating with the inner space of the cooling box is installed at the bottom of the cooling box.
5. A casting temperature field and solidification sequence control system according to claim 1, characterized in that: A plurality of walking wheels are installed at the bottom of the cooling box.
6. A casting method, performed using the casting temperature field and solidification sequence control system according to any one of claims 1 to 5, characterized in that: The following steps are involved: First, pour coolant into the coolant storage tank and place the sand mold and casting in the center of the cooling tank; then start the submersible pump, and the coolant enters the cooling tank through the submersible pump and pipeline. During this process, the submersible pump controls the coolant injection speed and monitors the liquid level in real time through a scale. The coolant first submerges the bottom of the sand mold and casting, increasing the cooling rate of the bottom of the casting. Before the middle shrinkage feeding channel is closed, the bottom of the casting is fed. Then, as the coolant level rises, sequential solidification is completed from bottom to top.