Centrifugal casting system for casting titanium products

Abstract

The utility model discloses a centrifugal casting system for casting a titanium product. The centrifugal casting system comprises a centrifugal cylinder for placing a casting mold, a separation bracket, a graphite casting cavity and flow guide pipes which are assembled on the outer wall of the graphite casting cavity in the circumferential direction at intervals. The flow guide pipes are of an axial splicing structure, a fastening component is arranged between every two adjacent flow guide pipes, and the fastening components are connecting cylinders which are connected to the outer walls of the adjacent flow guide pipes in a flat attaching mode. According to the flow guide pipe, the flow guide pipe is arranged to be of the axial splicing structure, through the splicing structure, adaptive splicing for casting of different products can be achieved, and the problem that at present, the cost is high due to the fact that each casting product needs to be provided with a set of adaptive flow guide pipe is solved. The assembled flow guide pipes can be quickly fastened through the fastening components, so that the problem that sealing is not solid when the flow guide pipes are assembled on the graphite casting cavity and fixed through thin iron wires and the like at present is solved, and the consistency of the sealing effect of the flow guide pipes assembled in the circumferential direction of the graphite casting cavity is guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of titanium product casting and molding, and in particular to a centrifugal casting system for casting titanium products. Background Art

[0002] The casting of titanium products is a complex process that requires precise control. It mainly involves steps such as raw material preparation, melting, casting, cooling and post-processing. It is usually used to cast some special products that are difficult to machine, such as pump bodies. Since titanium is a very active metal and easily reacts with oxygen, nitrogen, hydrogen, carbon, etc. in liquid state, the melting process must be carried out under high vacuum or inert gas protection (such as argon or neon). For example, a vacuum shell furnace is used, which mainly includes a centrifugal casting system, as shown in the attached manual. Figure 1-4 As shown, it includes a centrifugal cylinder for placing the casting mold, a separation bracket is set in the center of the centrifugal cylinder, and a graphite casting cavity is coaxially mounted on the separation bracket, and guide tubes are installed on the outer wall of the graphite casting cavity at circumferential intervals. The centrifugal casting process of titanium products is as follows:

[0003] First, the shape and structure of the product are designed through three-dimensional software, and then the titanium product is printed out using wax material using 3D printing; then the outside of the wax product is sandblasted to form a sand shell, and after the sand shell solidifies, the wax inside is melted away, and then the shell in the shape of the product is placed in a centrifugal cylinder (multiple can be placed simultaneously along the circumference), and the space between the outside of the shell and the centrifugal cylinder is filled densely with filler; then the graphite casting cavity is coaxially positioned and assembled on the separation bracket in the centrifugal cylinder, and then by assembling guide tubes of different lengths (the length of the guide tube is selected according to the position of the casting port on the top of the shell), the centrifugal cylinder is assembled in a vacuum solidification furnace, and then the vacuum solidification furnace drives the centrifugal cylinder to rotate, and at the same time, the suspension tube in the vacuum solidification furnace is used to inject titanium liquid into the graphite casting cavity, and the liquid flows into the shell through the guide tube, thereby realizing centrifugal casting of the titanium product. After the casting is completed, the shell is broken to form the cast titanium product.

[0004] Since titanium reacts with other materials to a certain extent, graphite casting cavities and guide tubes are currently used. During the casting operation, the shapes and specifications of the products vary, resulting in different positions of the shell to be cast in the centrifuge, that is, the distance between the casting port of the shell and the guide tube is different. Therefore, when casting different products, a guide tube of appropriate length is selected to guide the titanium liquid. Therefore, manufacturers need to be equipped with guide tubes of various lengths and specifications, and as new products are added, the guide tubes need to be equipped simultaneously, which leads to excessive inventory of guide tubes and increased accessories costs. In addition, when casting different products, it is necessary to replace and assemble guide tubes of different lengths on the graphite casting cavity, such as Figure 3-4As shown, after assembly, thin wire or binding rope is usually used for binding and fixing, which increases the working steps and also causes the problem of poor sealing. Summary of the Invention

[0005] In response to the above-mentioned problems, the present application aims to provide a centrifugal casting system for casting titanium products, which sets the guide tube as an axial assembly structure. Through this assembly structure, adaptive assembly can be achieved for the casting of different products, so as to solve the current high cost problem that each cast product needs to be equipped with a set of adaptive guide tubes.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted in this application is as follows: a centrifugal casting system for casting titanium products, comprising a centrifugal cylinder for placing a casting mold, a separation bracket being arranged in the center of the centrifugal cylinder, a graphite casting cavity being coaxially assembled on the separation bracket, and guide tubes being assembled on the outer wall of the graphite casting cavity along circumferential intervals, characterized in that: the guide tubes are an axially assembled structure, and fastening components are arranged between adjacent guide tubes.

[0007] Preferably, the fastening member is a connecting tube flatly connected to the outer wall of the adjacent guide tube, and fastening bolts that can be tightened against the outer wall of the guide tube on each side are passed through both sides of the connecting tube.

[0008] Preferably, each of the fastening bolts is obliquely inserted into the connecting tube in the direction of the adjacent flow guide pipe.

[0009] Preferably, the bottom end of each fastening bolt is rotatably connected to an arc-shaped fastening plate flatly attached to the outer peripheral surface of the guide pipe.

[0010] The beneficial effect of the present application is that the present application sets the guide tube as an axial assembly structure, through which adaptive assembly can be achieved for the casting of different products, so as to solve the current high cost problem that each casting product needs to be equipped with a set of adaptive guide tubes.

[0011] The assembled guide tube can be quickly fastened by the fastening component to solve the problem of poor sealing when the guide tube is currently assembled on the graphite casting cavity and fixed with thin iron wire, etc., and to ensure the consistency of the sealing effect of the guide tube assembled along the circumference of the graphite casting cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a diagram of the centrifuge cylinder structure.

[0013] Figure 2 The diagram shows the graphite casting cavity, guide tube and centrifugal cylinder assembled in sequence.

[0014] Figure 3 for Figure 2Illustration of centrifugal casting inside the model shell after assembly.

[0015] Figure 4 Illustrations showing the changes in casting position for model shells of different specifications and the replacement of guide tubes with appropriate lengths.

[0016] Figure 5 This is a diagram illustrating the splicing process of the connecting tube and the adjacent guide tube in this application.

[0017] Figure 6 This is a diagram showing how the connection strength of adjacent flow guide pipes is enhanced by tightening bolts in this application.

[0018] Figure 7 For this application, the fastening bolts and arc-shaped fastening plates are set obliquely to improve the sealing of the guide pipe splicing.

[0019] Figure 8 For this application Figure 7 A partial enlarged image.

[0020] Figure 9 This is a diagram illustrating the protrusion and groove structure of adjacent guide pipes in this application.

[0021] Figure 10 This is a real-life illustration of a centrifuge cylinder.

[0022] Figure 11 This is a physical illustration of the graphite casting cavity and several flow guide tubes.

[0023] Figure 12 This is a real picture of the model shell after sandblasting.

[0024] In the figure: 31-protrusion; 32-groove; 7-model shell; 8-thin wire (binding rope). DETAILED DESCRIPTION

[0025] In order to enable ordinary technicians in this field to better understand the technical solution of the present application, the technical solution of the present application is further described below in conjunction with the accompanying drawings and embodiments.

[0026] Refer to the attached Figures 1 to 9 The centrifugal casting system for casting titanium products shown in the figure includes a centrifugal cylinder 1 for placing a casting mold, a separation bracket 11 disposed at the center of the centrifugal cylinder 1, a graphite casting cavity 2 coaxially mounted on the separation bracket 11, and flow guide tubes 3 mounted at circumferential intervals on the outer wall of the graphite casting cavity 2. In order to solve the current problem of increased costs due to the need to select appropriate flow guide tubes for different casting products, as well as the problems of increased operating procedures and poor sealing caused by frequent assembly, as shown in the figure. Figure 5As shown, the present application sets the guide tube 3 as an axial assembly structure, through which adaptive assembly can be achieved for the casting of different products, so as to solve the current high cost problem that each casting product needs to be equipped with a set of adaptive guide tubes.

[0027] At the same time, in order to facilitate the rapid assembly of the flow guide tube 3, as shown in FIG. Figure 6 As shown, fastening members are provided between adjacent flow guide tubes 3. These fastening members can quickly fasten the assembled flow guide tubes 3, thereby resolving the current problem of poor sealing when the flow guide tubes 3 are assembled on the graphite casting cavity 2 and fixed with thin wires, etc., and ensuring consistent sealing of the flow guide tubes 3 assembled circumferentially along the graphite casting cavity 2.

[0028] Specifically, such as Figure 5-6 As shown, the fastening member is a connecting tube 4 flatly connected to the outer wall of the adjacent guide tube 3, and fastening bolts 5 are provided on both sides of the connecting tube 4 to tighten against the outer wall of each guide tube 3. Preferably, when forming the graphite casting cavity 2, a single section of guide tube 3 is integrally formed on its outer wall, and the single section of guide tube 3 is used for the subsequent splicing of guide tubes 3. The assembly process of the guide tube 3 is as follows Figure 5 As shown, first, the connecting tube 4 is sleeved on the above-mentioned single-section guide tube 3, and then the guide tube 3 to be spliced ​​is embedded into one side of the connecting tube 4, as shown in FIG. Figure 5 As shown, the end faces of the adjacent flow-guiding pipes 3 are made to flatten and abut against each other to ensure the sealing of the connection. Then, by rotating and tightening the bolts 5 until they abut against the outer circumference of the flow-guiding pipes 3, the adjacent flow-guiding pipes 3 are quickly and sealedly assembled and connected. Then, the flow-guiding pipes 3 are extended in the same splicing manner.

[0029] In order to improve the sealing performance of the adjacent flow guide pipes 3 after splicing, Figure 7 As shown, each of the fastening bolts 5 is obliquely arranged on the connecting tube 4 toward the adjacent guide tube 3. During the rotation of the fastening bolt 5, its bottom end abuts against the outer peripheral surface of the guide tube 3. At the same time, since the fastening bolt 5 is arranged obliquely, its action direction during the rotation is as follows: Figure 7 As shown by the middle arrow, the flow guide tubes 3 on both sides are driven toward each other, thereby improving the adhesion between the end faces of adjacent flow guide tubes 3, that is, improving the sealing performance of the splicing.

[0030] In order to further improve the sealing performance of the adjacent flow guide pipes 3 after splicing, Figure 7-8As shown, the bottom end of each fastening bolt 5 is rotatably connected to an arcuate fastening plate 6 that lies flush against the outer circumference of the flow conduit 3. Rotating the fastening bolt 5 drives the arcuate fastening plate 6, and utilizing the friction between the arcuate fastening plate 6 and the circumference of the flow conduit 3, the end faces of the flow conduit 3 on both sides are further pressed and tightened, improving the sealing performance of the splicing. Compared to the bottom end of the fastening bolt 5, the arcuate fastening plate 6 has a larger contact area with the surface of the flow conduit 3 (this prevents the disadvantage of excessive and concentrated contact force between the bottom end of the fastening bolt 5 and the circumference of the flow conduit 3, which could cause the flow conduit 3 to break). Therefore, it further increases the compressive force exerted by the fastening bolt 5 on the circumference of the flow conduit 3, improving the pressure and sealing performance between the end faces of the flow conduit 3.

[0031] Since the flow guide tube 3 is also made of graphite, its end surface has a certain degree of roughness, and the sealing performance of the end surfaces of adjacent flow guide tubes 3 after being attached needs to be improved. Therefore, in order to solve this problem, it is preferred that Figure 9 As shown, the end faces of adjacent guide tubes 3 are sequentially provided with mutually embedded protrusions 31 and grooves 32. Through the mutual embedding of the protrusions and grooves, not only the sealing performance after splicing can be effectively improved, but also the axial positioning of adjacent guide tubes 3 can be achieved, ensuring the flushness of the inner circumference and not affecting the circulation of titanium liquid.

[0032] The principle of this application is to solve the problem of increased accessory costs due to the need for a guide tube 3 of a suitable length for each casting product, and the problem of poor sealing due to frequent assembly of the guide tube 3 with the graphite casting cavity 2, by providing mutually spliced ​​guide tubes 3. When assembling the guide tube 3, the present application first sets the connecting tube 4 on the single-section guide tube 3 integrally formed with the graphite casting cavity 2, then inserts the single guide tube 3 into the connecting tube 4, and realizes the embedded fit of the protrusion and groove of the adjacent guide tube 3. Then, the fastening bolt 5 is rotated to drive the arc-shaped fastening plate 6 to move obliquely, thereby driving the end faces of the guide tube 3 on both sides to further press and tighten, improving the splicing sealing. It is then assembled on the separation bracket in the centrifugal drum. When the separation drum is placed as a whole in a vacuum solidification furnace, the titanium liquid is suspended and circulated into the graphite casting cavity 2 through the suspended titanium liquid pipe, and the titanium liquid is guided into the mold through the guide tube to achieve centrifugal casting.

[0033] The above shows and describes the basic principles, main features and advantages of this application. Without departing from the spirit and scope of this application, this application will also have various changes and improvements, which fall within the scope of this application.

Claims

1. A centrifugal casting system for casting titanium products, comprising a centrifugal cylinder (1) for placing a casting mold, a separation bracket (11) provided at the center of the centrifugal cylinder (1), a graphite casting cavity (2) coaxially mounted on the separation bracket (11), and flow guide tubes (3) mounted on the outer wall of the graphite casting cavity (2) at circumferential intervals, characterized in that: The flow guide tubes (3) are of an axially assembled structure, and fastening components are provided between adjacent flow guide tubes (3).

2. The centrifugal casting system according to claim 1, characterized in that: The fastening member is a connecting tube (4) flatly connected to the outer wall of the adjacent guide tube (3), and fastening bolts (5) that can be tightened against the outer wall of the guide tube (3) on each side are provided on both sides of the connecting tube (4).

3. The centrifugal casting system according to claim 2, characterized in that: Each of the fastening bolts (5) is obliquely passed through the connecting tube (4) toward the adjacent flow guide tube (3).

4. The centrifugal casting system according to claim 3, characterized in that: The bottom end of each fastening bolt (5) is rotatably connected to an arc-shaped fastening plate (6) flatly attached to the outer peripheral surface of the guide tube (3).

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