A gate bar

Abstract

The present invention provides a gate rod, which includes a sprue cup, a main runner, a secondary runner, a first exhaust pipe and a tree box structure. The bottom of the sprue cup is communicated with the main runner. The main runner extends from the side wall to both sides to form the secondary runner. The length direction of the secondary runner is perpendicular to the length direction of the main runner. The tree box structures are arranged in an array along the length direction of the secondary runner and are communicated with it. The tree box structure is communicated with the sprue cup through the first exhaust pipe. The structure of the present invention is simple. By setting the exhaust pipe structure, the porosity defect rate of the casting is reduced, and it has good market application prospects.

Description

Technical Field

[0001] The present invention relates to the technical field of precision casting equipment, and in particular to a gate rod. Background Art

[0002] In the field of precision casting technology, a gate rod is required in the production of products. The conventional gate rod is a straight gate rod. The molten metal is directly poured into the bottom of the gate rod from the sprue cup, which is likely to cause stable flow and gas entrainment, increasing the proportion of slag holes and gas holes. At the same time, the impact force on the bottom of the gate rod is large, which is likely to cause the surface layer at the bottom of the gate rod to fall off. The fallen surface layer enters the casting with the molten steel, increasing the proportion of sand holes.

[0003] Currently, the solutions to improve slag and gas holes mainly include adding slag blocking cotton, filter screens, or adopting multiple slag-making technologies. However, the reduction of the scrap rate has little effect. Summary of the Invention

[0004] In view of this, the present invention provides a gate rod that can reduce the slag and gas holes in the casting to a certain extent.

[0005] The technical solution of the present invention is realized as follows: The present invention provides a gate rod, which includes a sprue cup, a main runner, a secondary runner, a first exhaust pipe, and a tree assembly box structure. The bottom of the sprue cup is communicated with the main runner. The main runner extends from the side wall to both sides to form secondary runners. The length direction of the secondary runner is perpendicular to the length direction of the main runner. The tree assembly box structures are arranged in an array on the secondary runner and are communicated with the secondary runner. The tree assembly box structure is communicated with the sprue cup through the first exhaust pipe.

[0006] Based on the above technical solution, preferably, a plurality of tree assembly box structures are arranged in an array along the length direction on the main runner, and the tree assembly box structures on the main runner are communicated with it.

[0007] The tree assembly box structure is used to provide a welding plane for a single wax part. The side surface of the tree assembly box structure is formed by connecting a plurality of plane structures, and each plane structure forms a tree end face.

[0008] Based on the above technical solution, preferably, the number of the secondary runners is not less than two. A plurality of secondary runners are arranged in an array along the length direction of the main runner, and two adjacent secondary runners are arranged in parallel.

[0009] Based on the above technical solution, preferably, it further includes a second exhaust pipe. The tree assembly box structures closest to each other on two adjacent secondary runners are communicated with each other through the second exhaust pipe.

[0010] More preferably, the side surface of the tree assembly box structure protrudes from the side surface of the secondary runner, and the surface of the tree assembly box structure close to the sprue cup is communicated with the first exhaust pipe or the second exhaust pipe.

[0011] Based on the above technical solutions, preferably, the sprue cup is funnel-shaped, and the inner wall of the sprue cup is provided with spiral grooves.

[0012] Based on the above technical solutions, preferably, it further includes a filter screen, and the filter screen is installed at the bottom of the sprue cup.

[0013] Based on the above technical solutions, preferably, it further includes a buffer runner, and the buffer runner is communicated with one end of the main runner away from the sprue cup, and one end of the buffer runner away from the main runner is closed.

[0014] Based on the above technical solutions, preferably, the cross-sectional area of the buffer runner is smaller than that of the main runner.

[0015] The sprue bar of the present invention has the following beneficial effects compared with the prior art:

[0016] (1) The sprue bar of the present invention respectively uses the first exhaust pipe and the second exhaust pipe to communicate with the tree box structures at different positions, so as to communicate with the sprue cup, providing an outlet for gas for the mold after dewaxing, reducing the air content in the poured molten metal, and thus reducing the porosity defect rate of the casting;

[0017] (2) A buffer runner is arranged at the bottom end of the main runner, which can make the shed surface layer precipitate in the buffer area, prevent the shed surface layer from entering the part to form sand hole defects, thereby reducing the probability of sand holes. Moreover, the molten metal in the buffer runner forms a buffer structure, which can reduce the turbulence degree of the poured liquid, reduce the turbulence, and make the molten steel or molten iron fill the casting cavity more smoothly;

[0018] (3) The spiral groove structure in the sprue cup cooperates with the filter screen to prevent the dross in the poured molten metal from entering the main runner from the initial end. The filter screen gives a certain resistance to the poured molten metal, making its residence time in the sprue cup 1 longer, so that more dross stays in the spiral groove, achieving a better slag removal effect. The filter screen itself also has a slag removal effect, reducing the slag holes of the casting. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0020] Figure 1 It is the front view of the sprue bar of the present invention;

[0021] Figure 2Isometric view of the gate rod of the present invention;

[0022] Figure 3 Partial top view cross-sectional view of the gate rod of the present invention.

[0023] In the figure: 1 - sprue cup, 2 - main runner, 3 - secondary runner, 4 - first exhaust pipe, 5 - tree box assembly structure, 6 - filter screen, 7 - buffer runner, 8 - second exhaust pipe, 11 - spiral groove. Detailed implementation manners

[0024] Next, in combination with the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0025] As Figure 1 shown, in combination with Figure 2 and 3 , the gate rod of the present invention includes a sprue cup 1, a main runner 2, a secondary runner 3, a first exhaust pipe 4, and a tree box assembly structure 5. The bottom of the sprue cup 1 is in communication with the main runner 2. The side wall of the main runner 2 extends towards both ends to form the secondary runner 3. Preferably, the axis of the secondary runner 3 passes through the axis of the main runner 2 and the two are perpendicular to each other. The main runner 2 is in communication with the secondary runner 3. A plurality of tree box assembly structures 5 are arranged in an array along the axial direction of the secondary runner 3. The tree box assembly structure 5 is in communication with the secondary runner 3. Each tree box assembly structure 5 is in communication with the sprue cup 1 through the first exhaust pipe 4.

[0026] In the above embodiments, the pouring liquid enters from the sprue cup 1, flows downward through the filter screen 6 and the main runner 2, gradually fills the secondary runner 3, and flows from the secondary runner 3 into the tree box assembly structure 5, and then enters the cavity of the casting product. The first exhaust pipe 4 discharges the gas in the cavity of the casting product to the sprue cup 1 through the tree box assembly structure 5, so as to achieve the purpose of discharging the gas, thereby reducing the porosity defect.

[0027] In the specific implementation manner, a plurality of tree box assembly structures 5 are also arranged in an array along the length direction on the main runner 2. The tree box assembly structure 5 is in communication with the main runner 2.

[0028] In the above embodiments, the main runner 2 is directly in communication with the sprue cup 1. Therefore, the gas in the main runner 2 will directly be discharged into the sprue cup 1, which can also reduce the porosity defect, and at the same time increase the number of casting products that can be welded on each gate rod.

[0029] In the specific embodiment, the number of the secondary runners 3 is not less than two, and a plurality of secondary runners 3 are arranged in an array along the length direction of the main runner 2, and two adjacent secondary runners 3 are arranged in parallel with each other.

[0030] In the above embodiment, a plurality of secondary runners 3 increase the number of products cast by the gate rod at one time, thereby improving the production efficiency.

[0031] In the specific embodiment, it further includes a second exhaust pipe 8, and the closest tree box mounting structures 5 between two adjacent secondary runners 3 are communicated with each other through the second exhaust pipe 8.

[0032] In the above embodiment, when there are a plurality of secondary runners 3, the tree box mounting structure on the secondary runner 3 far from the sprue cup 1 is communicated with the closest tree box mounting structure on the upper secondary runner 3 through the second exhaust pipe 8. On the one hand, it provides an exhaust outlet for the tree box mounting structure below, on the other hand, it saves pipeline connection, and can make the overall structure simpler.

[0033] In the specific embodiment, the side surface of the tree box mounting structure 5 protrudes from the side surface of the secondary runner 3, and one side of the tree box mounting structure 5 close to the sprue cup is communicated with the first exhaust pipe 4 or the second exhaust pipe 8.

[0034] In the above embodiment, when the side surface of the tree box mounting structure 5 protrudes from the side surface of the secondary runner 3, the cross-sectional area of the tree box mounting structure 5 is larger than that of the secondary runner 3. At this time, the gas in the secondary runner 3 is more likely to gather in the tree box mounting structure 5, and the distance is closer to the direction where the sprue cup 1 is located. Setting the connection position of the first exhaust pipe 4 or the second exhaust pipe 8 and the tree box mounting structure 5 on one side of the tree box mounting structure 5 close to the sprue cup 1 can make the gas easier to discharge and discharge more completely.

[0035] As Figure 3 shown, in the specific embodiment, the sprue cup 1 is funnel-shaped, and the inner wall of the sprue cup 1 is provided with a spiral groove 11.

[0036] In the above embodiment, a filter screen 6 is placed at the bottom of the sprue cup 1. Before the pouring liquid enters the main runner 2 from the sprue cup 1, it flows in the spiral groove 11, increasing the flow time. Combining with the structure of the groove, the floating slag in the pouring liquid can be gathered and stayed in the spiral groove 11, thereby reducing the pouring floating slag entering the main runner, and further reducing the slag holes in the casting.

[0037] In the above embodiment, the filter screen 6 increases the resistance of the pouring liquid during pouring, so that the pouring liquid stays at the sprue cup 1 for a longer time, and the pouring floating slag therein is also more likely to gather in the spiral groove 11, thereby further reducing the slag holes in the casting.

[0038] In a specific embodiment, it further includes a buffer runner 7. The buffer runner 7 is in communication with the end of the main runner 2 away from the sprue cup 1, and the end of the buffer runner 7 away from the main runner 2 is closed.

[0039] In the above embodiment, the buffer runner 7 is mainly used to slow down the pouring turbulence caused by the high-speed flow of the pouring liquid from the main runner 2. At the same time, it is used to precipitate the surface layer falling off the bottom of the main runner 2 and prevent it from entering the casting product cavity, thereby affecting the quality of the pouring liquid entering the tree box structure. When the buffer runner 7 is provided, the buffer runner 7 mainly bears the impact. Even if the surface layer falls off on the buffer runner 7, the fallen surface layer will continue to remain in the buffer runner 7 and is not easy to flow out. At the same time, when the pouring liquid fills the buffer runner 7, a pouring buffer layer will be formed to prevent the pouring liquid from falling rapidly and impacting the inner wall to form turbulence, thereby reducing the porosity defect. The fallen surface layer will not flow out, thereby reducing the risk of sand holes in the casting.

[0040] In a specific embodiment, the cross-sectional area of the buffer runner 7 is smaller than that of the main runner 2

[0041] In the above embodiment, through the inner cavity structure from the main runner 2 to the buffer runner 7, preferably a variable-diameter structure with a gradually changing inner diameter. At this time, the pouring liquid gradually converges during the flowing process, so that it is easier to form a laminar flow, which can avoid scouring and erosion of the inner walls of the main runner 2 and the buffer runner 7, and further reduce the occurrence of porosity defects.

[0042] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A gate rod, which comprises a gate cup (1), a main runner (2) and a secondary runner (3). The bottom of the gate cup (1) is in communication with the main runner (2), and the main runner (2) extends from the side wall to both sides to form the secondary runner (3). The length direction of the secondary runner (3) is perpendicular to the length direction of the main runner (2), and it is characterized in that, It further includes a first exhaust pipe (4) and a tree box assembly structure (5). The tree box assembly structure (5) is array-mounted on the secondary flow channel (3). The tree box assembly structure (5) is in communication with the secondary flow channel (3), and the tree box assembly structure (5) is in communication with the sprue cup (1) through the first exhaust pipe (4). The number of the secondary flow channels (3) is not less than two. A plurality of secondary flow channels (3) are arrayed along the length direction of the main flow channel (2), and two adjacent secondary flow channels (3) are arranged in parallel. It further includes a second exhaust pipe (8). The tree box assembly structures (5) closest to each other on two adjacent secondary flow channels (3) are in communication with each other through the second exhaust pipe (8). The side surface of the tree box assembly structure (5) protrudes from the side surface of the secondary flow channel (3). The side of the tree box assembly structure (5) close to the sprue cup (1) is in communication with the first exhaust pipe (4) or the second exhaust pipe (8). A number of tree box assembly structures (5) are arrayed along the length direction on the main flow channel (2), and the main flow channel (2) is in communication with the tree box assembly structure (5).

2. The gate rod according to claim 1, characterized in that, The sprue cup (1) is funnel-shaped, and a spiral groove (11) is provided on the inner wall of the sprue cup (1).

3. The gate rod according to claim 1, wherein, It further includes a filter screen (6), and the filter screen (6) is installed at the bottom of the sprue cup (1).

4. The gate rod according to claim 1, characterized in that, It further includes a buffer flow channel (7). The buffer flow channel (7) is in communication with the end of the main flow channel (2) far from the sprue cup (1), and the end of the buffer flow channel (7) far from the main flow channel (2) is closed.

5. The gate rod according to claim 4, characterized in that, The cross-sectional area of the buffer flow channel (7) is smaller than the cross-sectional area of the main flow channel (2).

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