Gate stick for turbine investment casting

Abstract

The utility model discloses a gate stick for turbine investment casting, which comprises a body, the body is composed of a plurality of stick bodies with different radiuses, a circular truncated cone step is formed at the joint of every two adjacent stick bodies, a gate cup connecting end is arranged at the top end of the body, and a plurality of connecting tables are arranged on the side walls of the curved surfaces of the stick bodies; the rod body is of a multi-end type structure, a stepped casting cavity is formed in a mold after wax melting, according to the design, molten metal can be divided at the stepped position in the casting process, one part is directly used for casting a part at the current position, and the other part enters the casting cavity formed by the next section of rod body. The casting of a plurality of parts is in the casting process, and the problem of time difference of the parts close to one end of the pouring cup due to molten metal casting is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of investment casting, in particular to a gate rod for turbine investment casting. Background Art

[0002] Investment casting, also known as lost wax casting, includes processes such as wax pressing, wax trimming, tree formation, slurry dipping, wax melting, pouring molten metal, and post-processing. Lost wax casting uses wax to create a wax mold of the part to be cast. The wax mold is then coated with silica sol slurry. After the coating is completed, a mold shell is formed. The wax inside the mold shell is then melted and removed. After the mold shell is roasted, molten metal is poured through the pouring gate. After cooling, the desired part is completed. When producing small parts through automated investment casting, multiple parts are usually poured and molded at once, which requires a sprue rod.

[0003] Existing gate rods often use a rod with a diameter that gradually decreases from top to bottom. This type of gate rod presents the following problems during casting: Because a large number of parts are cast on a single rod, the part farther from the gate cup (hereinafter referred to as the lower part) is filled first during the casting process and enters the cooling process. During this process, a small amount of molten metal enters the part closer to the gate cup (hereinafter referred to as the upper part). Before the lower part is filled, the amount of molten metal entering the upper part is uncontrollable and intermittent, affecting the casting quality of the upper part.

[0004] In view of this, there is an urgent need for a gate rod for turbine investment casting that can solve the above problems. Utility Model Content

[0005] The purpose of the utility model is to provide a gate rod for turbine investment casting which solves the above problems.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solution: a gate rod for turbine investment casting, comprising:

[0007] The main body is composed of multiple sections of rods with different radii. The connection between two adjacent groups of rods forms a circular step ladder. The top of the main body is provided with a pouring cup connection end, and multiple connection platforms are provided on the curved side wall of the rod.

[0008] Preferably, the radius of the rod body gradually decreases from the side close to the pouring cup connection end to the side away from the pouring cup connection end.

[0009] Preferably, the inclination angle between the connecting platform and the rod body is 30-60°.

[0010] Preferably, the connection platforms on different sections of the rod are staggered.

[0011] Preferably, the main body is provided with a pouring cup that matches it, and the pouring cup includes a cup body and a filling tube, one end of the filling tube is fixedly connected to the cup body, and the other end matches the connecting end of the pouring cup.

[0012] Preferably, a guide cone is provided inside the filling tube near the pouring cup connection end. The guide cone is conical in shape, with the top surface of the guide cone close to the cup body and its bottom surface fixed on the inner wall of the filling tube, and multiple blanking notches are provided on the side wall of the guide cone curved surface.

[0013] Preferably, the blanking notch is located on the side wall of the guiding conical surface close to the inner wall of the filling tube, and the position of the blanking notch corresponds to the position of the connecting platform.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] The rod body adopts a multi-end structure, and a stepped casting cavity is formed in the mold after the wax is melted. This design will cause the molten metal to be diverted at the steps during the casting process. A small part is directly used to cast the parts at the current position, and most of it enters the casting cavity formed by the next section of the rod body, so that the casting of multiple parts is in the casting process, avoiding the situation where the parts near one end of the pouring cup are intermittently cast due to the molten metal casting. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall cross-sectional structure of a gate rod for turbine investment casting;

[0017] Figure 2 It is a structural diagram of the main body in the utility model;

[0018] Figure 3 This is a schematic diagram of the cross-sectional structure of the pouring cup in the embodiment of the present utility model;

[0019] Figure 4 This is a schematic structural diagram of a guide cone in an embodiment of the present utility model.

[0020] In the figure: 1, main body; 10, rod body; 11, circular step ladder; 12, pouring cup connection end; 2, connecting platform; 3, pouring cup; 30, cup body; 31, filling cylinder; 32, guide cone; 320, blanking notch. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0022] Example 1

[0023] Please see the attached Figure 1-2, a gate rod for turbine investment casting, comprising:

[0024] The main body 1 is composed of multiple rods 10 with different radii. The connection between two adjacent groups of rods 10 forms a circular step 11. The top of the main body 1 is provided with a pouring cup connection end 12. The curved side walls of the rods 10 are provided with multiple connection platforms 2.

[0025] Rods 10 of different radii constitute the main body 1, and circular steps 11 are formed at the connection points of different rods 10. A plurality of connecting platforms 2 for connecting with the turbine wax film are arranged near the circular steps 11. After the wax is melted, a stepped layer is formed at the circular steps 11. During the casting process, the molten metal near the wall of the casting cavity will flow along the wall into the cavity of the connecting platform 2 at the upper end during the sliding process, so that the upper part is always in a slow casting process, avoiding the problem of cooling faults during the casting process of the upper part, and the remaining part quickly enters the casting cavity of the lower part from the middle position of the casting cavity, and the casting of the lower part is quickly completed before the casting of the upper part.

[0026] Specifically, the radius of the rod body 10 gradually decreases from the side close to the pouring cup connection end 12 to the side away from the pouring cup connection end 12; the rod body 10 adopts a structure in which the radius gradually decreases from top to bottom in order to ensure that the casting solidifies in the order of first bottom and then top, thereby effectively controlling the shrinkage feeding position and ensuring that no shrinkage holes are generated inside the casting.

[0027] Considering that during the casting process, the molten metal needs to enter the cavity formed after the wax is melted on the connecting platform 2 into the cavity formed after the wax is melted on the turbine wax film. If the vertical position of the cavity formed after the wax is melted on the connecting platform 2 does not have a height difference with the vertical position of the cavity formed after the wax is melted on the turbine wax film, there is a problem that the air in the cavity formed after the wax is melted on the turbine wax film cannot be discharged smoothly. Therefore, a certain angle needs to exist between the connecting platform 2 and the rod body 10. Specifically, the inclination angle of the connecting platform 2 and the rod body 10 is 30-60°. The angle of the connecting platform 2 within this range can not only ensure the discharge of the air in the cavity, but also control the casting speed.

[0028] Specifically, the connection platforms 2 on the rod bodies 10 at different sections are staggered with each other; the staggered arrangement of the connection platforms 2 on different rod bodies 10 can achieve the purpose of staggering the turbine wax films in space and reasonably utilize the casting space.

[0029] Example 2

[0030] Considering that the present invention mainly utilizes the casting cavity wall formed after the wax is melted close to the main body 1 to guide the molten metal, so that the upper part can be cast continuously and slowly during the casting of the lower part, ensuring that the temperature of the molten metal in the space where the upper part is located does not change too much, and the lower end of the pouring cup used in actual pouring is mostly in the middle position of the cavity formed after the wax is melted by the main body 1, so there is a possibility that the molten metal does not contact the cavity wall at all, then the advantages of the rod body 10 design of the present invention are lost, so it is necessary to ensure that the molten metal can contact the casting cavity wall, please refer to the attached Figure 3-4 ;

[0031] Specifically, the main body 1 is provided with a pouring cup 3 that matches it (such as the straight barrel type pouring crucible used in the present invention), and the pouring cup 3 includes a cup body 30 and a filling tube 31, one end of the filling tube 31 is fixedly connected to the cup body 30, and the other end matches the pouring cup connecting end 12; a filling tube 31 that matches the pouring cup connecting end 12 is provided below the pouring cup 3 to guide the molten metal from the pouring cup 3 into the casting cavity.

[0032] Specifically, a guide cone 32 is provided inside the filling tube 31 on one side close to the pouring cup connection end 12. The guide cone 32 is conical in shape, and the top surface of the guide cone 32 is close to the cup body 30. The bottom surface is fixed on the inner wall of the filling tube 31, and a plurality of discharge notches 320 are provided on the curved side wall of the guide cone 32. In order to ensure that the molten metal can be guided to flow along the wall of the casting cavity, a guide cone 32 is provided in the filling tube 31. The molten metal flowing into the cup body 30 is guided to the position of the cavity wall of the filling tube 31 through the characteristics of the cone structure, and then enters the casting space through the multiple discharge notches 320 located at the cavity wall, ensuring that the molten metal can flow along the cavity wall formed after the wax of the rod body 10 is melted.

[0033] Specifically, considering that the turbine parts on different rods 10 are intertwined in space, the number and position of the blanking notches can also be set based on the relative position of the connecting platform 2, so as to avoid the situation where the metal liquid cannot flow normally into the casting cavity of some parts due to the obstruction of the connection between the guide cone 32 and the filling tube 31.

[0034] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A gate rod for turbine investment casting, characterized in that: include: The main body (1) is composed of multiple sections of rods (10) with different radii, and the connection between two adjacent groups of rods (10) forms a circular step ladder (11). The top of the main body (1) is provided with a pouring cup connection end (12), and the curved side wall of the rod (10) is provided with multiple connection platforms (2).

2. A gate rod for turbine investment casting according to claim 1, characterized in that: The radius of the rod body (10) gradually decreases from the side close to the pouring cup connection end (12) to the side away from the pouring cup connection end (12).

3. The gate rod for turbine investment casting according to claim 1, characterized in that: The inclination angle between the connecting platform (2) and the rod body (10) is 30-60°.

4. The gate rod for turbine investment casting according to claim 1, characterized in that: The connection platforms (2) located on different sections of the rod body (10) are staggered in position.

5. A gate rod for turbine investment casting according to claim 4, characterized in that: The main body (1) is provided with a pouring cup (3) matched therewith, and the pouring cup (3) comprises a cup body (30) and a filling tube (31), one end of the filling tube (31) is fixedly connected to the cup body (30), and the other end is matched with the pouring cup connection end (12).

6. The gate rod for turbine investment casting according to claim 5, characterized in that: A guide cone (32) is provided inside the filling tube (31) on a side close to the pouring cup connection end (12). The guide cone (32) is conical in shape. The top surface of the guide cone (32) is close to the cup body (30), and the bottom surface is fixed to the inner wall of the filling tube (31). A plurality of blanking notches (320) are provided on the curved side wall of the guide cone (32).

7. A gate rod for turbine investment casting according to claim 6, characterized in that: The blanking notch (320) is located on the curved side wall of the guide cone (32) close to the inner side wall of the filling cylinder (31), and the position of the blanking notch (320) corresponds to the position of the connecting platform (2).

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