A horizontal mold for casting a rotating target and a casting method

Abstract

The present invention relates to the technical field of target production, and particularly to a horizontal mold for casting a rotating target and a casting method. It includes a back tube and an outer sleeve tube located outside and coaxial with it. The back tube and the outer sleeve tube form a coaxial tube group. Sealing rings are arranged at both ends of the coaxial tube group. The sealing rings are located between the back tube and the outer sleeve tube and are welded to both of them. A cavity is formed inside the coaxial tube group. Vertical cylinders are also welded on the same side at both ends of the outer sleeve tube. A plurality of detachable coolers are arranged in the inner hole of the back tube to counteract the buoyancy of the molten liquid in the cavity on the back tube. By first putting the mold into a heating furnace, then baking the mold, then pouring, and finally cooling, a blank of the rotating target can be obtained. The present invention does not require digging a pit or building a platform, and the cost is relatively low.

Description

Technical Field

[0001] The present invention relates to the technical field of target production, and particularly relates to a horizontal mold for casting a rotating target and a casting method. Background Art

[0002] A rotating target, also called a tubular target, includes a back tube, and the outer part of the back tube is a target material layer. A low-melting-point rotating target is suitable for being manufactured by a casting method. The rotating targets in the prior art are all cast in a vertical manner. For example, the patent with the application number 202110569974.1 discloses a cooler and a cooling method for casting a target, which records that the mold is vertically placed in a pit furnace during casting. Its height is relatively high and it is not easy to operate. It is necessary to dig a pit to place the pit furnace in the pit to reduce the height of the upper end (so that its upper end is slightly higher than the ground), or it is necessary to build a relatively high platform, and the platform is slightly lower than the upper end of the pit furnace, and the operator stands on the platform to operate. Both of these have relatively high costs. Summary of the Invention

[0003] The technical problem to be solved by the present invention is, aiming at the above existing technical deficiencies, to provide a horizontal mold for casting a rotating target and a casting method.

[0004] To solve the above technical problem, the technical solution adopted by the present invention is: a horizontal mold for casting a rotating target, including a back tube and an outer sleeve tube located outside and coaxial with it. The back tube and the outer sleeve tube are made of the same material. The back tube and the outer sleeve tube form a coaxial tube group. Sealing rings are arranged at both ends of the coaxial tube group. The sealing rings are located between the back tube and the outer sleeve tube and are welded to both of them to seal both ends of the coaxial tube group. A cavity is formed inside the coaxial tube group. Vertical cylinders are also welded on the same side at both ends of the outer sleeve tube. One end of the vertical cylinder is communicated with the cavity and the other end is an opening. A plurality of detachable coolers for offsetting the buoyancy of the molten liquid in the cavity on the back tube are arranged in the inner hole of the back tube.

[0005] Preferably, the cooler includes a cylinder body. The density of the cylinder body is greater than the density of the molten liquid in the cavity. A cavity is arranged inside the cylinder body. First water pipes and second water pipes communicated with the cavity are respectively arranged at both ends of the inner wall of the cylinder body.

[0006] Preferably, the cooler includes a cylinder body. The inside of the cylinder body is a cavity. First water pipes and second water pipes communicated with the cavity are respectively arranged at both ends of the inner wall of the cylinder body. A counterweight cylinder is arranged in the inner hole of the cylinder body. The density of the counterweight cylinder is greater than the density of the molten liquid in the cavity.

[0007] Preferably, the material of the cylinder body is tungsten.

[0008] Preferably, the material of the counterweight cylinder is tungsten.

[0009] A method for casting a rotating target using a horizontal mold for casting a rotating target, comprising the following steps:

[0010] S1. Horizontally place the mold in a heating furnace with an extending direction being horizontal, and make the side provided with a vertical cylinder face upward;

[0011] S2. Turn on the heating furnace and perform mold baking;

[0012] S3. Inject the molten solution of the target material into the cavity of the mold through at least one vertical cylinder, and then perform heat preservation;

[0013] S4. Connect one of the first water pipe and the second water pipe to a cooling water source, and connect the other to the return water of the cooling water source through a pipeline;

[0014] S5. Pass cooling water into two coolers located at the center in the axial direction of the back pipe for cooling. After the target material at the positions corresponding to these two coolers is completely solidified, then pass cooling water into the coolers outside these two coolers in sequence for cooling until the molten solution in the entire cavity is cooled completely.

[0015] Compared with the prior art, the present invention has the following advantages: 1. Horizontal casting is adopted, without the need to dig a pit or build a platform, and the cost is relatively low; 2. A plurality of detachable coolers are arranged in the inner hole of the back pipe, which can offset the buoyancy of the molten solution in the cavity on the back pipe, so that the back pipe will not be bent or the bending is small. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram when casting with the mold of the present application.

[0017] Figure 2 It is a schematic structural diagram of the mold of the present application.

[0018] Figure 3 It is a schematic structural diagram of the cooler in Embodiment 1.

[0019] Figure 4 It is a schematic structural diagram of the cooler in Embodiment 2.

[0020] In the figure: 1. Mold; 11. Back pipe; 12. Outer sleeve pipe; 13. Vertical cylinder; 14. Sealing ring; 2. Heating furnace; 3. Cooler; 31. Cylinder body; 32. Cavity; 33. First water pipe; 34. Second water pipe; 35. Counterweight cylinder. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] To make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessarily confusing the concepts of the present invention.

[0022] Embodiment 1

[0023] Combined with Figures 1-3 As shown, a horizontal mold for casting a rotating target includes a back tube 11 and an outer sleeve tube 12 located outside and coaxial with it. A transition layer is preferably provided on the outer surface of the back tube 11. The back tube 11 and the outer sleeve tube 12 are made of the same material, preferably both are made of 304L stainless steel. The back tube 11 and the outer sleeve tube 12 form a coaxial tube group. Sealing rings 14 are provided at both ends of the coaxial tube group. The sealing rings 14 are located between the back tube 11 and the outer sleeve tube 12 and are welded to both of them to seal both ends of the coaxial tube group. A cavity is formed inside the coaxial tube group. Vertical cylinders 13 are also welded to the same side of both ends of the outer sleeve tube 12. One end of the vertical cylinder 13 communicates with the cavity and the other end is open. A plurality of detachable coolers 3 are provided in the inner hole of the back tube 11 to counteract the buoyancy of the molten liquid in the cavity on the back tube 11. Because the mold 1 is horizontally placed during use, the back tube 11 is subject to the buoyancy of the molten liquid. The magnitude of the buoyancy is equal to the gravity of the molten liquid displaced by the back tube 11. The outer diameter of the back tube 11 is generally 133 mm and the wall thickness is 4 mm, and the back tube 11 is generally about four meters long. Therefore, the buoyancy it receives is equal to the gravity of the cylindrical molten liquid with an outer diameter of 133 mm and a length of about four meters, which is relatively large. If the buoyancy is not counteracted, the back tube will arch upward significantly. Counteracting means generating a downward force so that the upward resultant force received by the back tube 11 is smaller, so that no bending or less bending will occur. The gravity of the cooler 3 is close to the buoyancy received by the back tube 11 corresponding to its length.

[0024] Specifically, the cooler 3 includes a cylinder body 31. The outer diameter of the cylinder body 31 is slightly smaller than the inner diameter of the back tube 11. The density of the cylinder body 31 is greater than the density of the molten liquid in the cavity. A cavity 32 is arranged inside the cylinder body 31. At both ends of the inner wall of the cylinder body 31, a first water pipe 33 and a second water pipe 34 communicating with the cavity 32 are respectively arranged. The downward pressure generated by the cylinder body 31 on the back tube 11 per unit length is preferably slightly less than the buoyancy of the molten liquid on the back tube 11 per unit length. Since the material of the rotating target is generally tin, zinc tin or zinc aluminum, etc., with a density of about 7 grams per cubic centimeter, and the gravity of the molten liquid displaced by the back tube 11 is equal to the volume of a cylinder with the outer diameter and length of the back tube 11 multiplied by the density of the molten liquid, and the outer diameter of the cylinder body 31 is slightly smaller than the inner diameter of the back tube 11 and it also has an inner hole for passing through the first water pipe 33 and the second water pipe 34, therefore, the material of the cylinder body 31 is preferably tungsten (with a density of 19.35 grams per cubic centimeter). The coolers 3 in the inner hole of the back tube 11 are preferably adjacent to each other. The positions where the first water pipe 33 and the second water pipe 34 communicate with the cavity 32 are in the same orientation as the position of the vertical cylinder 13, so that the positions where the first water pipe 33 and the second water pipe 34 communicate with the cavity 32 are at the top of the cooler 3 during subsequent casting. Combined with Figure 2 As shown, all the first water pipes 33 can be passed through the inner holes of all the coolers 3 on their left side successively to the left (or right), and all the second water pipes 34 can be passed through the inner holes of all the coolers 3 on their right side successively to the right (or left). In order to avoid being blocked by the next first water pipe 33 and second water pipe 34, the first water pipe 33 and the second water pipe 34 can be bent appropriately during the passing process. The first water pipes 33 and second water pipes 34 on the left side of the middle part of the mold 1 can also be passed through to the left, and the first water pipes 33 and second water pipes 34 on the right side of the middle part of the mold 1 can be passed through to the right. Of course, all the first water pipes 33 and second water pipes 34 can also be passed through to one side, but in this case, the inner hole of the cylinder body 31 will appear a bit crowded. As Figure 3 shown, the cavity 32 is preferably close to the outer surface of the cylinder body 31, and the thickness of the cavity 32 is not too large, so that the cooler 3 has sufficient weight and the inner hole of the cylinder body 31 is as large as possible.

[0025] A method for casting a rotating target using the horizontal mold for casting a rotating target includes the following steps:

[0026] S1. Horizontally place the mold 1 in a heating furnace 2 with an extending direction in the horizontal direction, and make the side where the vertical cylinder 13 is arranged face upward; in order to prevent the mold 1 from rotating, a support seat can be arranged in the heating furnace 2, and a semi-circular or small-segment circular notch is arranged on the upper part of the support seat; preferably, the bottom and both sides of the heating furnace 2 are fixed, and the top cover can move for convenient operation. The two ends of the heating furnace 2 can be blocked with refractory cotton, and the first water pipe 33 and the second water pipe 34 pass through the refractory cotton and extend to the outside of the heating furnace 2;

[0027] S2. Turn on the heating furnace 2 for mold baking. The mold baking temperature is generally about 80°C - 100°C lower than the melting point of the target material, and the mold baking time should be as short as possible.

[0028] S3. Pour the molten liquid of the target material into the cavity of the mold 1 through at least one riser 13. There should also be a certain amount of molten liquid in the riser 13 (for feeding), and then insulation is carried out. The insulation temperature is generally about 30°C higher than the melting point of the target material. Depending on the material and temperature, the insulation time is generally 20 minutes to 3 hours to enable the molten liquid to infiltrate the back tube 11.

[0029] S4. Connect one of the first water pipe 33 and the second water pipe 34 to the cooling water source, and connect the other to the return water of the cooling water source through a pipeline. The cooling water source is the cooling water supply equipment; alternatively, one of them can be connected to a tap water pipe with a valve (for opening and closing), and the other is connected to the sewer through a pipeline.

[0030] S5. Pass cooling water into the two coolers 3 located at the center of the axial direction of the back tube 11. The cooling water flows into the cavity 32 through one of the first water pipe 33 and the second water pipe 34 and flows out through the other for cooling. After the target material corresponding to these two coolers 3 is completely solidified (generally considered completely solidified after a certain time), then pass cooling water into the coolers 3 outside these two coolers 3 for cooling in sequence, that is, first pass cooling water into the first cooler 3 outside these two coolers 3. After the target material corresponding to it is completely solidified, then pass cooling water into the second cooler 3 outside these two coolers 3, and so on until the molten liquid in the entire cavity is cooled. During the cooling process, due to the volume shrinkage of the liquid turning into a solid, the molten liquid in the riser 13 will flow into the cavity for feeding, so that the final target material can fill the cavity. The heating furnace 2 is preferably a heating furnace that can control the temperature in sections, so as to turn off the heating of the furnace section where the cooler 3 for passing cooling water is located. After casting, the blank of the rotating target is obtained. After demolding (retaining the back tube 11), machining can obtain the rotating target.

[0031] There are multiple coolers 3. One is to achieve sequential solidification, and the other is that the outer diameter of the cooler 3 can be made as large as possible (close to the inner diameter of the back tube 11) to have a good cooling effect. If there is only one cooler 3 with a very large length, since the back tube 11 is not absolutely straight and has a bend of about one millimeter, in order to enable the cooler 3 to be completely inserted into the back tube 11, its outer diameter needs to be made smaller. When cooling, solidification starts from the middle to both sides, and the speed is doubled, and the time required for the molten liquid in the entire cavity to be cooled is greatly reduced. After casting, the cooler 3 can be taken out from the back tube 11.

[0032] Embodiment 2

[0033] This embodiment is basically the same as Embodiment 1, except that: in combination with Figure 4 As shown, the cooler 3 includes a cylinder body 31, the inside of the cylinder body 31 is a cavity 32, both ends of the inner wall of the cylinder body 31 are respectively provided with a first water pipe 33 and a second water pipe 34 communicated with the cavity 32, a counterweight cylinder 35 is arranged in the inner hole of the cylinder body 31, and the density of the counterweight cylinder 35 is greater than the density of the molten liquid in the cavity. The material of the counterweight cylinder 35 is preferably tungsten. This kind of structure is convenient for processing and the cost is also lower than that of Embodiment 1.

Claims

1. A horizontal mold for casting a rotating target, comprising a back tube (11) and an outer sleeve tube (12) located outside and coaxial with it. The back tube (11) and the outer sleeve tube (12) form a coaxial tube group, and it is characterized in that: The back tube (11) and the outer sleeve tube (12) are made of the same material. Sealing rings (14) are provided at both ends of the coaxial tube group. The sealing rings (14) are located between the back tube (11) and the outer sleeve tube (12) and are welded to both of them to seal both ends of the coaxial tube group. A cavity is formed inside the coaxial tube group. Vertical cylinders (13) are also welded to the same side of both ends of the outer sleeve tube (12). One end of the vertical cylinder (13) communicates with the cavity and the other end is open. A plurality of detachable coolers (3) are provided in the inner hole of the back tube (11) to counteract the buoyancy of the molten liquid in the cavity on the back tube (11).

2. The horizontal mold for casting a rotating target according to claim 1, wherein: The cooler (3) includes a cylinder body (31). The density of the cylinder body (31) is greater than the density of the molten liquid in the cavity. A cavity (32) is provided inside the cylinder body (31). A first water pipe (33) and a second water pipe (34) communicating with the cavity (32) are respectively provided at both ends of the inner wall of the cylinder body (31).

3. The horizontal mold for casting a rotating target according to claim 1, characterized in that: The cooler (3) includes a cylinder body (31). The inside of the cylinder body (31) is a cavity (32). A first water pipe (33) and a second water pipe (34) communicating with the cavity (32) are respectively provided at both ends of the inner wall of the cylinder body (31). A counterweight cylinder (35) is provided in the inner hole of the cylinder body (31). The density of the counterweight cylinder (35) is greater than the density of the molten liquid in the cavity.

4. A horizontal mold for casting a rotating target, according to claim 2, characterized in that: The material of the cylinder body (31) is tungsten.

5. The horizontal mold for casting a rotating target according to claim 3, characterized in that: The material of the counterweight cylinder (35) is tungsten.

6. A method for casting a rotating target using a horizontal mold for casting a rotating target according to any one of claims 2 and 3, characterized in that Including the following steps: S1. Horizontally place the mold (1) in a heating furnace (2) with an extending direction in the horizontal direction, and make the side provided with the vertical cylinder (13) face upward. S2. Turn on the heating furnace (2) and perform mold baking. S3. Inject the molten liquid of the target material into the cavity of the mold (1) through at least one vertical cylinder (13), and then perform heat preservation. S4. Connect one of the first water pipe (33) and the second water pipe (34) to a cooling water source, and connect the other one to the return water of the cooling water source through a pipeline. S5. Pass cooling water into the two coolers (3) located at the center in the axial direction of the back tube (11) for cooling. After the target material at the positions corresponding to these two coolers (3) is completely solidified, then pass cooling water into the coolers (3) outside these two coolers (3) in sequence for cooling until the cooling of the molten liquid in the entire cavity is completed.

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