Combined assembly aluminum alloy flow control rod and manufacturing method thereof

Abstract

The present application relates to the technical fields of aluminum alloy casting, and discloses a combined and assembled aluminum alloy flow control rod and a manufacturing method thereof, wherein the flow control rod is in a rod shape, and sequentially comprises a rod body and an end head from top to bottom; the length of the end head is 30-50 mm; a lifting hole is arranged at the end of the rod body away from the end head; the end head is cast by material B, and the rod body is cast by material A; the thermal expansion coefficient of the material B is greater than that of the material A; the material A is high silicon oxide 1.9, and the material B is high silicon oxide 2.3. The flow control rod is cast by two kinds of materials, and the manufacturing method is simple and low in cost; the flow control rod is good in erosion resistance and wear resistance, and the surface of the flow control rod is not easy to delaminate and fall off, and the whole flow control rod is not easy to break.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of aluminum alloy casting technology, in particular to a combined assembly aluminum alloy flow control rod and a manufacturing method thereof. BACKGROUND

[0002] In the aluminum alloy casting industry, in order to control the flow of molten aluminum, a flow control system device is installed, which mainly consists of a flow control rod (also known as a flow control plug, a flow control rod, etc.) and a pouring pipe. The flow control rod is inserted into the pouring pipe, and the flow control rod can move up and down in the pouring pipe. When the flow control rod moves to the lowermost end, the end of the lower end of the flow control rod blocks the pouring pipe. The pouring pipe cooperates with the purified molten aluminum to control the flow, ensuring the stability of the aluminum alloy casting parameters. The upper end of the flow control rod is provided with a lifting hole to facilitate connection with the control mechanism to control its lifting.

[0003] This makes the flow control rod need to be in contact with the aluminum alloy liquid during use, so that the material for making the flow control rod has the following use requirements: the material has no adhesion to the aluminum alloy liquid, the material is resistant to corrosion of the aluminum alloy, and the material does not crack during use. And the end of the flow control rod has a certain wear on itself during up and down movement, so the material also needs to have wear resistance, and the strength also needs to have certain requirements.

[0004] The conventional flow control rod is made of a single material, which has a low thermal expansion coefficient and is not easy to crack. However, in the process of special aluminum alloy casting, 4-series aluminum alloy, 5-series aluminum alloy, 6-series aluminum alloy, 7-series aluminum alloy, and aluminum-lithium alloy, etc. The material of the conventional flow control rod of the existing technology is eroded and worn by the alloy, causing the surface of the conventional flow control rod to delaminate and fall off, so that the sealing contact surface of the flow control rod and the pouring pipe does not seal, and the flow control loses its effect.

[0005] Therefore, a combined assembly aluminum alloy flow control rod and a manufacturing method thereof are needed to solve the above technical problems. SUMMARY

[0006] The purpose of the present application is to overcome the above shortcomings and provide a combined assembly aluminum alloy flow control rod and a manufacturing method thereof.

[0007] To achieve the above purpose, the present application is implemented according to the following technical solutions:

[0008] A combined assembly aluminum alloy flow control rod, the flow control rod is a rod-shaped structure, which is sequentially provided with a rod body and an end from top to bottom; the length of the end is 30-50mm; the end of the rod body away from the end is provided with a lifting hole;

[0009] The end is made of material B, and the rod body is made of material A;

[0010] The thermal expansion coefficient of the material B is greater than that of the material A;

[0011] The material A is high silica 1.9, and the material B is high silica 2.3.

[0012] The diameter and total length of the flow control rod are not further limited in the present application, and the diameter and total length of the flow control rod are matched with the downcomer used in combination, and the diameter and total length can be designed by the person skilled in the art according to the actual use requirement.

[0013] Preferably, the high silica 1.9 comprises the following components: 59.0wt% of SiO2, 10.3wt% of CaO, 30.5wt% of Al2O3, and the balance of other trace elements.

[0014] Preferably, the thermal expansion coefficient of the high silica 1.9 is 0.5*10 -6 K -1 .

[0015] Preferably, the particle size of the high silica 1.9 is not more than 0.9mm.

[0016] Specifically, the high silica 1.9 further comprises the following indexes: the maximum use temperature of the high silica 1.9 is 982℃, and the material amount of the high silica 1.9 is 1.99g / cm 3 In use, the mass of the high silica 1.9 required in pouring can be calculated according to the actual volume of the rod body of the designed flow control rod and the material amount of the high silica 1.9. The physical indexes are shown in Table 1:

[0017] Table 1 Physical indexes of high silica 1.9

[0018]

[0019] Preferably, the high silica 2.3 comprises the following components: 46.0wt% of SiO2, 2.3wt% of CaO, 0.2wt% of Fe2O3, 35.5wt% of SiC, 15.1wt% of Al2O3, and the balance of other trace elements.

[0020] Preferably, the thermal expansion coefficient of the high silica 2.3 is 0.65*10 -6 K -1 .

[0021] Preferably, the particle size of the high silica 2.3 is not more than 4.75mm.

[0022] Specifically, the high silica 2.3 further comprises the following indexes: the maximum use temperature of the high silica 2.3 is 1093℃, and the material amount of the high silica 2.3 is 2.32g / cm 3In use, the volume of the actual end of the designed flow control rod can be combined with the amount of high silica 2.3 to calculate the mass of high silica 2.3 needed for pouring. The physical indexes are shown in Table 2:

[0023] Table 2 Physical indexes of high silica 2.3

[0024]

[0025] The application also includes a method for manufacturing a combined and assembled aluminum alloy flow control rod, comprising the following steps:

[0026] S1 pouring, selecting a mold matched with the flow control rod, mixing high silica 2.3 with water to obtain mud B, and mixing high silica 1.9 with water to obtain mud A; in the mud A, the amount of water is 3-9wt% of the total mass of the mud A; in the mud B, the amount of water is 3-9wt% of the total mass of the mud B; pouring the mud B in the mold to form the end, and then pouring the mud A to form the rod body, to obtain the poured mold;

[0027] S2 demolding, demolding the poured mold after standing at normal temperature and pressure for one day, and then curing for two days, to obtain the flow control rod blank;

[0028] S3 sintering, sintering the blank obtained in step S2 at a temperature of 750℃ for 3h, to obtain the finished flow control rod.

[0029] Specifically, the following steps are included: after selecting a mold matched with the flow control rod, calculating the volume of the rod body and the end according to the design drawing of the finished flow control rod, and calculating the mass of high silica 2.3 needed for the end of the flow control rod and the mass of high silica 1.9 needed for the rod body of the flow control rod according to the amount of high silica 1.9 material being 1.99g / cm 3 , and the amount of high silica 2.3 material being 2.32g / cm 3 ; and weighing the corresponding materials according to the calculated mass.

[0030] When mixing high silica 2.3 and high silica 1.9 with water, the amount of water can meet the requirements of pouring forming, and the less the amount of water, the better.

[0031] The working principle of the application is as follows:

[0032] The application improves the anti-erosion performance and wear resistance of the material of the flow control rod, to prevent the surface of the flow control rod from delaminating and falling off, and to ensure that the overall material of the flow control rod is not easy to break.

[0033] Although the whole flow control rod can select a material with good anti-erosion performance, the material with large thermal expansion coefficient is prone to breakage in use or the material cost or processing cost is high. Selecting a single material with low thermal expansion coefficient to make the flow control rod is not prone to breakage, but the anti-erosion and wear resistance performance is slightly poor, and the above selection has various disadvantages. In order to solve the above problems, different materials are used at different positions of the flow control rod in the application, two materials are assembled and combined, the defects of the respective materials are effectively avoided, the advantages of the respective materials are utilized, and a new flow control rod is designed and manufactured.

[0034] The application adopts a material with low thermal expansion coefficient, high silica 1.9 (good anti-cracking performance and slightly poor anti-erosion), which is used for the rod body of the flow control rod; the contact part of the flow control rod and the downpipe, that is, the end of the flow control rod adopts a material with good anti-erosion, high silica 2.3 (large thermal expansion coefficient, good anti-erosion performance, high strength and wear resistance).

[0035] Since the erosion of the rod body of the flow control rod does not affect the sealing of the contact surface of the flow control rod and the downpipe, the thermal expansion coefficient is small and not prone to cracking; the end of the flow control rod adopts an anti-erosion material, although the thermal expansion coefficient is large, since the height of the end is extremely short compared with the length of the sealing surface (the height of the sealing surface is not more than 100 mm), the absolute expansion amount is low, and the overall thermal stress is extremely small, so the overall flow control rod is not prone to cracking.

[0036] The high silica 1.9 of the application has a low thermal expansion coefficient of 0.5*10 -6 K -1 , good anti-cracking performance. The high silica 2.3 has a high thermal expansion coefficient of 0.65*10 -6 K -1 , good anti-erosion performance, high strength and good wear resistance. The difference between the thermal expansion coefficients of the two materials of the application is controlled within 0-30%, which reduces the stress generated by the difference in thermal expansion of the two materials and can prevent the cracking of the combination surface of the two materials.

[0037] The application uses high silica 1.9 and high silica 2.3, both of which are refractory concrete castables, and the difference between the initial setting time and the final setting time is not more than one hour (the limitation of the initial setting time and the final setting time of the castable is mainly to control the configuration time of the castable during operation to avoid solidification after configuration. The skilled person in the art can adjust the configuration time of the castable with a different time limit, which will not be described in detail here), and synchronous solidification can reduce the stress generated during solidification.

[0038] In the manufacturing method of the application, high silica 2.3 is first cast in the mold, then high silica 1.9 is cast, and then the two materials are fully solidified into one body during the solidification process.

[0039] In the present application, the height of the high silica 2.3 is generally controlled at 30-50mm (i.e. the length of the end of the flow control rod). Controlling the height of the high silica 2.3 material can prevent cracking caused by excessive expansion under heat and stress. On the other hand, controlling the height can make the contact part between the flow control rod and the injection pipe resistant to erosion and wear and not fall off. After sintering, the two materials can be well combined together by heat treatment without cracking.

[0040] Compared with the prior art, the present application has the following advantages:

[0041] The flow control rod of the present application is made of two materials and has the advantages of simple manufacturing method, low cost, good erosion resistance, good wear resistance, no easy delamination and falling off of the surface of the flow control rod, and no easy breaking of the whole flow control rod. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 Fig. 1 is a structural schematic view of the flow control rod of the present application;

[0043] Figure 2 Fig. 2 is a schematic view of the use state between the flow control rod and the injection pipe of the present application.

[0044] In the figure: 1, flow control rod; 2, rod body; 3, end; 4, lifting hole; 5, injection pipe; 6, sealing surface. DETAILED DESCRIPTION

[0045] The present application will be further described below with specific examples. The illustrative examples and descriptions of the present application are used to explain the present application but do not limit the present application.

[0046] Example 1

[0047] As shown in Figs. 1 and 2, a combined and assembled aluminum alloy flow control rod is provided, which is rod-shaped and has a rod body 2 and an end 3 from top to bottom. Figure 1 , Figure 2 The length of the end 3 is 30-50mm. The end of the rod body 1 away from the end 3 is provided with a lifting hole 4.

[0048] The end is made of material B and the rod body is made of material A. The material A is high silica 1.9 and the material B is high silica 2.3.

[0049] In actual use, the flow control rod 1 is inserted into the injection pipe 5, the end 3 abuts against the inner side wall of the injection pipe 5 to form a sealing surface 6, and the whole injection pipe 5 is blocked.

[0050] The high-silica 1.9 includes the following components: 59.0wt% of SiO2, 10.3wt% of CaO, 30.5wt% of Al2O3, and the balance of other trace elements. The thermal expansion coefficient of the high-silica 1.9 is 0.5*10 -6 K -1 The particle size of the high-silica 1.9 is not more than 0.9mm.

[0051] The high-silica 2.3 includes the following components: 46.0wt% of SiO2, 2.3wt% of CaO, 0.2wt% of Fe2O3, 35.5wt% of SiC, 15.1wt% of Al2O3, and the balance of other trace elements. The thermal expansion coefficient of the high-silica 2.3 is 0.65*10 -6 K -1 The particle size of the high-silica 2.3 is not more than 4.75mm.

[0052] A manufacturing method of a combined assembly aluminum alloy flow control rod, comprising the following steps:

[0053] S1 pouring, selecting a mold matched with the flow control rod, calculating the volume of the rod body and the end according to the finished product design drawing of the flow control rod, and calculating the mass of the high-silica 2.3 required by the end of the flow control rod and the mass of the high-silica 1.9 required by the rod body of the flow control rod according to the material usage of the high-silica 1.9 being 1.99g / cm 3 , and the material usage of the high-silica 2.3 being 2.32g / cm 3 ; and weighing the corresponding materials according to the calculated mass.

[0054] Mixing the high-silica 2.3 with water to obtain a mud B, and mixing the high-silica 1.9 with water to obtain a mud A; in the mud A, the water usage is 6wt% of the total mass of the mud A; in the mud B, the water usage is 6wt% of the total mass of the mud B; pouring the mud B in the mold to form the end, and then pouring the mud A to form the rod body, to obtain a poured mold;

[0055] S2 demolding, demolding the poured mold after standing at normal temperature and pressure for one day, and then curing for two days, to obtain a flow control rod blank;

[0056] S3 sintering, sintering the blank obtained in the step S2 at a temperature of 750℃ for 3h, to obtain a finished product of the flow control rod.

[0057] The technical scheme of the present application is not limited to the above specific embodiments, and any technical modification made according to the technical scheme of the present application falls within the protection scope of the present application.

Claims

1. A combination assembled aluminum alloy flow control bar, characterized by: The flow control rod is a rod structure, and comprises a rod body and a head from top to bottom; the length of the head is 30-50mm; a lifting hole is arranged at the end of the rod body far from the head; The head is cast by material B, and the rod body is cast by material A; The thermal expansion coefficient of the material B is greater than that of the material A; The material A is high silica 1.9, and the material B is high silica 2.3; The high silica 1.9 comprises the following components: 59.0wt% of SiO2, 10.3wt% of CaO, 30.5wt% of Al2O3, and the balance of other trace elements; The high silica 2.3 comprises the following components: 46.0wt% of SiO2, 2.3wt% of CaO, 0.2wt% of Fe2O3, 35.5wt% of SiC, 15.1wt% of Al2O3, and the balance of other trace elements.

2. The combination assembled aluminum alloy flow rod according to claim 1, characterized in that: The coefficient of thermal expansion of the high silica 1.9 is 0.5 x 10 -6 K -1 .

3. The combination assembled aluminum alloy flow rod according to claim 1, wherein: The particle size of the high silica 1.9 is not more than 0.9mm.

4. The combination assembled aluminum alloy flow rod according to claim 1, wherein: The coefficient of thermal expansion of the high silica 2.3 is 0.65 x 10 -6 K -1 .

5. The combination assembled aluminum alloy flow rod according to claim 1, wherein: The particle size of the high silica 2.3 is not more than 4.75mm.

6. The method of claim 1-5, wherein the method further comprises: The method comprises the following steps: S1 casting, selecting a mold matched with the flow control rod, mixing high silica 2.3 with water to obtain clay B, and mixing high silica 1.9 with water to obtain clay A; in the clay A, the amount of water is 3-9wt% of the total mass of the clay A; in the clay B, the amount of water is 3-9wt% of the total mass of the clay B; pouring the clay B in the mold to form the head; then pouring the clay A to form the rod body, and obtaining the mold after casting; S2 demolding, the mold after casting is demolded after standing at normal temperature and pressure for one day, and then cured for two days, to obtain the flow control rod blank; S3 sintering, sintering the blank obtained in step S2 at a temperature of 750℃ for 3h, to obtain the finished flow control rod.

Images