Comprehensive temperature control steel core for low-pressure die
By using separate stainless steel and carbon steel cores and an independent internal flow channel design, the problems of water seepage, leakage, and inaccurate temperature control of the integral steel core are solved, achieving precise temperature control and efficient cooling, and reducing residual material in the casting system.
Patent Information
- Application Number
- CN202511352915.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-22
- Publication Date
- 2026-01-23
AI Technical Summary
The existing integral steel core has problems such as water leakage, water flow and inaccurate temperature control during the casting process, and it cannot simultaneously meet the insulation and cooling requirements of different locations.
The upper mold steel core, water-cooled steel core, and sprue steel core are designed as separate parts, using stainless steel and carbon steel respectively. With an independent internal flow channel design, the water cooling start time is precisely controlled through the matching of concave and convex stops and rock wool insulation to prevent water from flowing in and out.
It achieves precise temperature control, improves water cooling efficiency, reduces residual material in the casting system, and increases the yield of the process.
Smart Images
Figure CN121373370A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of temperature control steel core, and particularly relates to a comprehensive temperature control steel core for low-pressure mold. BACKGROUND
[0002] When a foundry utilizes a mold to cast a cylindrical structure, a steel core needs to be used for temperature control. The existing steel core is a whole steel core, which comprises an inner liner and an outer liner. The outer liner is sleeved on the outer side of the inner liner. The butt joints at the upper and lower ends of the inner and outer liners are welded together to form a whole structure. Water channels are arranged at different heights between the inner and outer liners and are communicated with external water lines to achieve temperature control. However, the whole steel core has the following shortcomings. 1. It cannot achieve layer-by-layer water cooling. When water is injected into the water channels through the external water lines, since the inner liner and the outer liner are not absolutely sealed, water can easily flow between the water channels at different heights.
[0003] 2. The whole steel core is made of the same material, and the thermal conductivity coefficients of different positions are the same. The demand for heat preservation and cooling at different positions cannot be met at the same time. When one water cooling is started, the next water cooling radiation position is affected, and the temperature control is not accurate.
[0004] 3. It is easy to leak. The upper and lower ends of the inner and outer liners are welded together. This large-area welding method is prone to weld leakage. SUMMARY
[0005] In view of the shortcomings of the prior art, the present application provides a comprehensive temperature control steel core for low-pressure mold, which comprises an upper mold steel core, a water cooling steel core and a sprue steel core arranged in sequence from top to bottom. The upper mold steel core and the sprue steel core are made of stainless steel, and the water cooling steel core is made of carbon steel. The steel cores are separately arranged and have different thermal conductivity coefficients so as to achieve the purpose of heat preservation at the heat preservation position and cooling at the cooling position. Inner flow channels are independently arranged on the water cooling steel core. The water cooling can be controlled accurately without interference, the problems of water channeling and water leakage are solved, and the water cooling efficiency is improved.
[0006] In order to achieve the above-mentioned purpose, the present application is realized by the following technical scheme: A comprehensive temperature control steel core for low-pressure mold, comprising an upper mold steel core, a water cooling steel core and a sprue steel core arranged in sequence from top to bottom. The water cooling steel core is arranged in multiple layers. The upper mold steel core and the sprue steel core are made of stainless steel, and the water cooling steel core is made of carbon steel. The upper mold steel core, the water cooling steel core and the sprue steel core are matched with each other through concave-convex joints. Inner flow channels are independently arranged on each layer of the water cooling steel core, and the inner flow channels are communicated with external pipelines.
[0007] As a further implementation manner, a riser is arranged at the edge position of the upper mold steel core, and the riser is used to align with a through hole on an upper mold frame installed on the top of the upper mold steel core.
[0008] As a further implementation, the upper die steel core comprises two continuous upper and lower sections, the upper section is circular or square in cross section, and the lower section is a columnar structure, the upper section is clamped in a groove provided at the bottom of the upper die frame, and the riser is arranged on the upper section.
[0009] As a further implementation, the number of layers of the water-cooled steel core is determined according to the height of the casting, and the heights of the water-cooled steel cores in each layer are the same or different.
[0010] As a further implementation, a cross runner is arranged on the sprue steel core, and a flow divider cone is arranged at the cross runner.
[0011] As a further implementation, a passage is arranged at the center of the upper die steel core and the water-cooled steel core, and a plurality of external pipelines extend along the passage from top to bottom and communicate with the inner flow channels of each layer of water-cooled steel cores.
[0012] As a further implementation, each group of external pipelines corresponds to a group of inner flow channels of the water-cooled steel cores, and each group of external pipelines comprises a water inlet pipeline and a water return pipeline; a groove is arranged on the inner side of each group of water-cooled steel cores, a through hole is arranged at the groove, and the water inlet pipeline and the water return pipeline both extend to the groove and communicate with the inner flow channels through the through hole respectively.
[0013] As a further implementation, the inner flow channel is formed by a plurality of straight flow channels connected in sequence, a first end of each straight flow channel communicates with an adjacent straight flow channel, and a second end penetrates through the outer side of the water-cooled steel core, and the second end of the straight flow channel is used for cooperating with a plug to realize sealing.
[0014] As a further implementation, the grooves of each layer of water-cooled steel cores are arranged staggered.
[0015] As a further implementation, the gaps between each layer of water-cooled steel cores are matched, and rock wool is arranged at the gaps for heat insulation.
[0016] The beneficial effects of the present application are as follows: 1. The steel core of the present application comprises an upper die steel core, a water-cooled steel core and a sprue steel core arranged in sequence from top to bottom, the upper die steel core and the sprue steel core are made of stainless steel, the water-cooled steel core is made of carbon steel, the steel cores are separately arranged and have different thermal conductivities, so as to achieve the purpose of heat preservation in the heat preservation place and cooling in the cooling place; the inner flow channels are independently arranged on the water-cooled steel core, so that the water-cooled steel core can not interfere with each other during cooling, the water-cooled opening time can be accurately controlled, the problems of water leakage and water leakage are solved, and the water-cooled cooling efficiency is improved.
[0017] 2. The arrangement of the stainless steel upper die steel core can effectively preserve the aluminum liquid at the riser position, so that the size of the riser can be reduced; the arrangement of the stainless steel sprue steel core can ensure that the aluminum liquid in the cross runner is the last to solidify, so that the size of the cross runner can be reduced, thereby reducing the residual material of the casting system and improving the process yield. Attached Figure Description
[0018] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.
[0019] Figure 1 This is a front sectional view of the integrated temperature control steel core for low-pressure molds in an embodiment of the present invention; Figure 2 This is a schematic diagram of the AA section of the integrated temperature control steel core for low-pressure molds in an embodiment of the present invention; Figure 3 This is a schematic diagram of the BB cross-section of the integrated temperature control steel core for low-pressure molds in an embodiment of the present invention.
[0020] The diagram exaggerates the spacing or dimensions between parts to show their positions; the diagram is for illustrative purposes only.
[0021] Among them: 1. Upper mold frame, 2. Upper mold steel core, 3. Water-cooled steel core, 4. Sprue steel core, 5. Diverter cone, 6. External pipeline, 7. Internal flow channel; 31. Groove, 61. Water inlet pipeline, 62. Water return pipeline. Detailed Implementation
[0022] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.
[0023] Example 1 In a typical embodiment of the present invention, reference is made to Figure 1 As shown, a comprehensive temperature-controlled steel core for low-pressure molds includes an upper mold steel core 2, a water-cooled steel core 3, and a sprue steel core 4 arranged sequentially from top to bottom. The water-cooled steel core 3 is arranged in multiple layers. The upper mold steel core 2 and the sprue steel core 4 are made of stainless steel, while the water-cooled steel core 3 is made of carbon steel. The different materials of the steel cores have different thermal conductivity, so as to achieve the purpose of heat preservation where insulation is needed and cooling where cooling is needed.
[0024] like Figure 1 As shown, the upper mold steel core 2 is arranged at the bottom of the upper mold frame 1 of the mold. A riser is provided at the edge of the upper mold steel core, and the riser is used to align with the through hole on the upper mold frame installed on the top of the upper mold steel core.
[0025] The upper die steel core 2 comprises two continuous upper and lower sections, the upper section is circular or square in cross section, and the lower section is columnar structure. The upper die frame 1 is provided with a groove at the bottom, and the upper section of the upper die steel core 2 is clamped in the groove to realize embedded cooperation. The upper die steel core 2 and the upper die frame 1 are fixedly connected through tension screws. The size of the upper die frame 1 and the upper section of the upper die steel core 2 is larger than the size of the lower section of the upper die steel core 2.
[0026] The number of layers of the water-cooled steel core is determined according to the height of the casting. The runner steel core is arranged below the water-cooled steel core. The runner steel core is provided with a cross runner. The cross runner can be cross-shaped. The cross-shaped cross runner forms an outlet on the side of the runner to enable the casting liquid to flow to the side of the steel core. The cross runner is provided with a flow divider at the center. The flow divider divides the casting liquid into different outlets.
[0027] The height of each layer of the water-cooled steel core is the same or different. The outer surface shape of each layer of the water-cooled steel core 3 changes with the product structure. In this embodiment, the outer surface of the water-cooled steel core 3 is circular in cross section. Some special products can have some grooves, protrusions and other features. There is a gradient between layers, which is the demolding slope, generally 0.5-1°.
[0028] An inner flow channel 7 is independently arranged on each layer of the water-cooled steel core 3. The inner flow channel 7 is in communication with the external pipeline 6.
[0029] As shown in Figure 1 , the center of the upper die steel core 2 and the water-cooled steel core 3 is provided with a passage. The water-cooled steel core 3 is circular ring structure. The passage of the water-cooled steel core 3 is formed on the inner side. A plurality of external pipelines extend from top to bottom along the passage and are in communication with the inner flow channels 7 of each layer of the water-cooled steel core.
[0030] Specifically, each group of external pipelines 6 corresponds to a group of inner flow channels 7 of the water-cooled steel core 3. Each group of external pipelines includes one water inlet pipeline 61 and one water return pipeline 62. The inner flow channel 7 is provided with an inlet and an outlet. The water inlet pipeline 61 is in communication with the inlet, and the water return pipeline 62 is in communication with the outlet.
[0031] As shown in Figure 1 and Figure 3 , a groove 31 is arranged on the inner side of each group of water-cooled steel cores 3. That is, the passage of the water-cooled steel core 3 partially expands radially outward to form a groove 31. The groove is arranged close to the top of the water-cooled steel core 3. The arrangement of the groove can achieve the weight reduction of the water-cooled steel core. Through holes are arranged at the groove 31. Two through holes are arranged at each groove. The through holes are vertically arranged and in communication with the inner flow channel 7. One groove 31 is arranged on the inner side of one water-cooled steel core 3. The water inlet pipeline 61 and the water return pipeline 62 both extend to the groove 31. The water inlet pipeline 61 is in communication with the inlet of the inner flow channel 7 through the through hole. The water return pipeline 62 is in communication with the outlet of the inner flow channel 7 through the through hole.
[0032] In another preferred example, two grooves 31 are provided on the inner side of each group of water-cooled steel cores, and each groove 31 corresponds to a pipe. For example, one end of the water inlet pipe 61 extends to one groove 31, and the water return pipe 62 extends to another groove 31. Only one through hole is provided in each groove 31.
[0033] like Figure 2 As shown, the inner flow channel 7 is composed of multiple direct current channels connected sequentially. Each direct current channel is connected to an adjacent direct current channel at one end, and the other end penetrates the outer surface of the water-cooled steel core. The interconnected portions of the multiple direct current channels form a polygonal structure. In this embodiment, one set of water-cooled steel core 3 has an inner flow channel consisting of five direct current channels. When setting the inner flow channel 7, holes need to be drilled from the outer side of the water-cooled steel core 3. The five drilled holes are interconnected to form the inner flow channel. The outer end of the direct flow channel forms an opening on the outer side of the water-cooled steel core 3, which is used to cooperate with the plug to achieve a seal. The plug can be selected according to the size of the opening.
[0034] The internal flow channels of the multi-layer water-cooled steel core 3 are all formed by drilling holes on the outer side of the water-cooled steel core. Therefore, the internal flow channels of different layers of water-cooled steel core are independent. Each layer of internal flow channel is connected to a set of external pipes. Therefore, the cooling of each layer of water-cooled steel core is independent.
[0035] The inlet pipe of each set of external pipes introduces cooling water into the inner flow channel of the corresponding layer of water-cooled steel core. The cooling water circulates in the inner flow channel and flows out through the return pipe.
[0036] Understandably, each set of external pipes is arranged in a vertical Z-shape, with one end extending to the through hole in the groove and the other end extending upward along the channel in the center of the steel core to the top of the upper mold frame.
[0037] The grooves of each water-cooled steel core are staggered to ensure that different groups of external pipes do not interfere with each other when laying out external pipes.
[0038] In this embodiment, the internal flow channels 7 of the multi-layer water-cooled steel core 3 are each set independently, so they do not interfere with each other during cooling, the water cooling start time can be precisely controlled, and the problems of water cross-flow and leakage can be solved, thereby improving the water cooling efficiency.
[0039] The water-cooled steel core 3 can be set to one layer. As long as the channel in the middle of the water-cooled steel core 3 is large enough to accommodate external pipes, multiple layers can be added. In this example, the water-cooled steel core is set to three layers.
[0040] Specifically, the multi-layered water-cooled steel cores, the water-cooled steel core, the upper mold steel core 2, and the sprue steel core 4 are connected by concave and convex stop joints. The entire steel core structure is then fastened together with through screws. A gap, for example 0.5mm, is provided at the height of the stop joint to allow for the addition of one layer of rock wool. A 1mm gap would allow for the addition of two layers of rock wool. Adjustments can be made according to the actual situation. This invention requires a 0.5mm gap and the addition of one layer of rock wool to meet the design requirements.
[0041] Each layer of water-cooled steel core 3 is fitted with a gap, and rock wool is placed in the gap for insulation. This ensures that heat is not transferred between layers or has low thermal conductivity, allowing for precise control of the water cooling time required for each layer. This controls the solidification rate of the molten aluminum (casting liquid) within the mold. The number of rock wool layers needs to be determined based on the gap.
[0042] The upper mold core 2 and the sprue core 4 are made of stainless steel, while the water-cooled core 3 is made of carbon steel. The thermal conductivity of stainless steel is only 16 W / m·K, while that of ordinary carbon steel with 1% carbon content is 45 W / m·K. Based on this parameter, we know that the thermal conductivity of ordinary carbon steel with 1% carbon content is 2.8 times that of stainless steel. This indicates that stainless steel has a low thermal conductivity and is easier to keep warm.
[0043] Since the riser position of the upper mold steel core 2 is the position where the aluminum liquid temperature is lowest during the low pressure casting process, the aluminum liquid entering the riser has a slow internal cooling due to the low thermal conductivity, thereby slowing down the heat dissipation of the aluminum liquid and playing a better heat preservation role. This is more helpful for feeding the lower part of the product riser. Therefore, the upper mold steel core in this embodiment is made of stainless steel.
[0044] Furthermore, since the upper mold core is made of stainless steel, the riser size can be reduced. For example, an 80mm diameter riser can be reduced to 60mm or even smaller. If you want to further improve the riser's performance, the riser can be designed as a 1.5mm thick steel sleeve, and the outside of the steel sleeve can be wrapped with rock wool or refractory fiber paste to improve the riser's insulation effect.
[0045] Similarly, the gating core has four horizontal runners, meaning the bottom of the core is where the runners are located. The molten aluminum in this part needs to solidify last and also needs to be kept warm. Therefore, the gating core is also made of stainless steel.
[0046] By using a stainless steel gating core 4, heat preservation at this location can be effectively achieved. Due to the low thermal conductivity of the gating core, the size of the horizontal gating can be reduced, thereby reducing residual material in the casting system and improving the process yield. The cross-sectional area of 60*60mm can be reduced to 40*40mm, thus improving the utilization rate of molten aluminum.
[0047] The above merely provides the preferred embodiments of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the principles and technical scope of the present application shall fall into the scope of the present application.
Claims
1. A comprehensive temperature-controlled steel core for low-pressure molds, characterized in that, It includes an upper mold steel core, a water-cooled steel core, and a sprue steel core arranged sequentially from top to bottom. The water-cooled steel core has multiple layers. The upper mold steel core and the sprue steel core are made of stainless steel, while the water-cooled steel core is made of carbon steel. The upper mold steel core, the water-cooled steel core, and the sprue steel core are connected to each other by concave and convex stops. Each layer of the water-cooled steel core has an independent internal flow channel, which is connected to an external pipeline.
2. The integrated temperature-controlled steel core for low-pressure molds according to claim 1, characterized in that, A riser is provided at the edge of the upper mold steel core, and the riser is used to align with the through hole on the upper mold frame installed on the top of the upper mold steel core.
3. The integrated temperature-controlled steel core for low-pressure molds according to claim 2, characterized in that, The upper mold steel core comprises two continuous sections, the upper section having a circular or square cross-section and the lower section having a columnar structure. The upper section is engaged in a groove at the bottom of the upper mold frame, and the riser is located in the upper section.
4. The integrated temperature-controlled steel core for low-pressure molds according to claim 1, characterized in that, The number of layers of the water-cooled steel core is determined according to the height of the casting, and the height of each layer of the water-cooled steel core may be the same or different.
5. The integrated temperature-controlled steel core for low-pressure molds according to claim 4, characterized in that, A horizontal runner is arranged on the steel core of the gating system, and a flow divider cone is provided at the horizontal runner.
6. The integrated temperature-controlled steel core for low-pressure molds according to claim 5, characterized in that, A channel is provided at the center of the upper mold steel core and the water-cooled steel core, and multiple sets of external pipes extend from top to bottom along the channel and are connected to the internal flow channel of each layer of water-cooled steel core.
7. A comprehensive temperature-controlled steel core for low-pressure molds according to claim 6, characterized in that, Each set of external pipes corresponds to and connects to the internal flow channel of a set of water-cooled steel cores. Each set of external pipes includes an inlet pipe and a return pipe. A groove is provided on the inner side of each set of water-cooled steel cores, and a through hole is provided in the groove. Both the inlet pipe and the return pipe extend to the groove and are connected to the internal flow channel through the through hole.
8. A comprehensive temperature-controlled steel core for low-pressure molds according to claim 7, characterized in that, The internal flow channel is composed of multiple DC channels connected in sequence. The first end of each DC channel is connected to the adjacent DC channel, and the second end penetrates the outer surface of the water-cooled steel core. The second end of the DC channel is used to cooperate with the plug to achieve a seal.
9. A comprehensive temperature-controlled steel core for low-pressure molds according to claim 7, characterized in that, The grooves of each layer of water-cooled steel core are staggered.
10. A comprehensive temperature-controlled steel core for low-pressure molds according to claim 1, characterized in that, Each layer of water-cooled steel core is fitted with a gap, and rock wool is installed in the gap for heat insulation.