Siphon slag removal gating structure

Abstract

A siphon slag-removing runner structure for pouring metal solution into a cavity of a die casting machine, the runner structure comprising a siphon slag-removing mechanism, a straight runner and a inner runner; the siphon slag-removing mechanism comprising a sprue cup and a siphon runner, the siphon runner, the straight runner and the inner runner being connected in sequence between the sprue cup and the cavity; when the metal solution in the sprue cup passes through the siphon runner, the residue in the metal solution can be suspended above the metal solution in the sprue cup under the siphon effect. In the present application, the siphon slag-removing mechanism is arranged in the runner structure, the siphon phenomenon is formed by using the liquid gravity difference, the local negative pressure is generated in the metal solution during the flow process, the residue is gradually suspended above the metal solution in the siphon runner cup because the density of the residue is smaller than that of the metal solution, the separation of the residue and the metal solution is realized, the residue filtering effect is good, the amount of residue entering the straight runner and the cavity is reduced, the risk of mechanical property deterioration of the casting caused by slag inclusion defects is reduced, and the casting quality is improved.

Description

Technical Field

[0001] This application relates to the field of casting technology, specifically to a siphon slag removal gating structure. Background Technology

[0002] In industrial production, casting relies on a gating system to inject molten iron into the mold cavity, where it then cools and solidifies. However, during the smelting, spheroidizing, and inoculation processes, a large number of non-metallic inclusions are inevitably generated. Some inclusions become nuclei for graphite precipitation; common nucleation materials include graphite, sulfides, oxides, carbides, nitrides, and metal compounds. Inclusions that fail to nucleate will appear as slag inclusions in the gating system, on the upper surface of the casting, on the back of bosses, and at wall thickness corners. Slag inclusions deteriorate the mechanical properties of the casting, cause stress concentration at the inclusion location, and may lead to crack propagation or even fracture during the casting's service life. Therefore, it is necessary to separate slag inclusions from the molten iron during the casting process.

[0003] In related technologies, the gating system consists of a pouring cup, a sprue, a runner, a filter, and an ingate. In actual production, although the filter can remove most of the inclusions in the molten iron, some inclusions will still accumulate on the machined surface or critical areas of the casting, resulting in poor filtration efficiency of the gating system. Utility Model Content

[0004] The purpose of this application is to provide a siphon slag removal gating structure to solve the problems of poor filtration effect and poor casting quality of gating structures.

[0005] To achieve the objectives of this application, the following technical solution is provided:

[0006] In a first aspect, this application provides a siphon slag removal gating structure for pouring molten metal into the cavity of a die-casting machine. The gating structure includes a siphon slag collection mechanism, a sprue, and an ingate.

[0007] The siphon slag collection mechanism includes a pouring cup and a siphon runner, wherein the siphon runner, the direct runner, and the ingate are sequentially connected between the pouring cup and the cavity;

[0008] When the molten metal in the pouring cup passes through the siphon gating channel, the residue in the molten metal can be suspended above the molten metal in the pouring cup under the siphon effect.

[0009] In one embodiment, the pouring cup includes a cup bottom and a side rim surrounding the cup bottom, the cup bottom and the side rim together forming a receiving groove for receiving molten metal, and the siphon gating channel is connected between the cup bottom and the direct gating channel;

[0010] The siphon gating channel curves upward, and the height of the highest point of the siphon gating channel is greater than the height of the bottom of the cup located in the receiving groove.

[0011] In one embodiment, the siphon gating system includes a first straight pipe, a first bent pipe, and a second straight pipe. The cup bottom, the first straight pipe, the first bent pipe, the second straight pipe, and the gating system are connected in sequence. The height of the first bent pipe is greater than the height of the cup bottom located in the receiving groove.

[0012] In one embodiment, the bending angle of the first bend is 90 degrees to 150 degrees.

[0013] In one embodiment, the gating structure further includes a first buffer section, which includes a third straight pipe and a second bent pipe. The second bent pipe bends downward, and the third straight pipe and the second bent pipe are sequentially connected between the bottom of the cup and the first straight pipe.

[0014] In one embodiment, the length of the first buffer section is less than the length of the siphon channel.

[0015] In one embodiment, the gating structure further includes a horizontal gating system and a filter. Multiple inlets are provided, the horizontal gating system connects the sprue and the multiple inlets, and the filter is disposed in the horizontal gating system.

[0016] In one embodiment, the cross-sectional area of ​​the sprue gradually decreases from the end near the filter toward the end near the sprue and / or the ingate.

[0017] In one embodiment, the end of the ingate away from the sprue bends upward to form a second buffer section.

[0018] In one embodiment, the gating structure further includes a pipe joint, which is connected between the second buffer portion and the cavity, wherein the length of the pipe joint is greater than the width of the pipe joint in its cross-section.

[0019] Compared with the prior art, this application has at least the following beneficial effects:

[0020] 1. In this application, a siphon slag collection mechanism is set in the gating structure. The siphon phenomenon is formed by the difference in gravity of the liquid, so that the molten metal generates a local negative pressure during the flow process. Since the density of the residue is smaller than that of the molten metal, the residue will gradually be suspended above the molten metal in the siphon gating cup, thereby realizing the separation of residue from molten metal. The residue filtration effect is good, which can effectively reduce the amount of residue entering the sprue and the cavity, reduce the risk of mechanical property deterioration of castings due to slag inclusion defects, and improve the quality of castings.

[0021] 2. In this application, by setting a siphon gating system between the pouring cup and the sprue, a height difference is formed between the siphon gating system and the liquid outlet on the pouring cup, which can effectively reduce the flow rate of the molten metal and allow the molten iron to enter the mold cavity smoothly, which helps to improve the forming accuracy and surface quality of the casting.

[0022] 3. In this application, a runner is connected between the sprue and the ingate. A filter is installed in the runner. After the siphon slag collection mechanism separates most of the residue, the filter performs secondary filtration on the molten metal, further reducing the residue content in the molten metal and providing double protection for the quality of the casting. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a perspective view of the siphon slag removal gating structure according to one embodiment of this application;

[0025] Figure 2 This is a front view of the siphon slag removal gating structure according to one embodiment of this application;

[0026] Figure 3 This is a perspective view of the ingate and pipe fitting according to one embodiment of this application.

[0027] Explanation of reference numerals in the attached figures:

[0028] 100. Siphon slag collection mechanism; 110. Pour cup; 111. Cup bottom; 112. Side wall; 120. Siphon runner; 121. First straight pipe; 122. First bend pipe; 123. Second straight pipe; 200. Straight runner; 300. Ingate; 310. Second buffer section; 400. First buffer section; 410. Third straight pipe; 420. Second bend pipe; 500. Horizontal runner; 600. Filter; 700. Pipe joint. Detailed Implementation

[0029] The following are specific embodiments of this application, which are described in conjunction with the accompanying drawings to further illustrate the technical solutions of this application. However, this application is not limited to these embodiments.

[0030] refer to Figure 1 , Figure 2 and Figure 3This application provides a siphon slag removal gating structure for pouring molten metal into the cavity of a die-casting machine. The gating structure includes a siphon slag collection mechanism 100, a direct gating system 200, and an ingate 300.

[0031] The siphon slag collection mechanism includes a pouring cup 110 and a siphon runner 120. The siphon runner 120, the direct runner 200 and the ingate 300 are connected sequentially between the pouring cup 110 and the mold cavity.

[0032] The main function of the pouring cup 110 is to receive the molten metal poured in from the outside. The pouring cup 110 has a large opening area so that the molten metal can be poured in smoothly. The volume of the pouring cup 110 is designed according to the amount of molten metal required for the casting in actual production.

[0033] The molten metal in the pouring cup 110 is sequentially poured into the mold cavity through the siphon gating system 120, the sprue 200, and the ingate 300, completing the pouring process. During the flow of the molten metal, a siphon gating system 120 is installed between the pouring cup 110 and the sprue 200 to remove residues. When the molten metal in the pouring cup 110 passes through the siphon gating system 120, the residues in the molten metal are suspended above the molten metal in the pouring cup 110 by the siphon effect.

[0034] In this application, a siphon slag collection mechanism 100 is set in the gating structure. The siphon phenomenon is formed by the difference in gravity of the liquid, so that the molten metal generates a local negative pressure during the flow process. Since the density of the residue is smaller than that of the molten metal, the residue will gradually float above the molten metal in the siphon pouring cup 110, thereby realizing the separation of residue from molten metal. The residue filtration effect is good, which can effectively reduce the amount of residue entering the sprue 200 and the cavity, reduce the risk of mechanical property deterioration of the casting due to slag inclusion defects, and improve the quality of the casting.

[0035] The molten metal can be iron. The pouring cup 110 is designed to hold approximately 1.2 times the volume of the molten metal required for a single pour of the casting cavity, to prevent overflow during pouring. Furthermore, the ample volume of molten metal allows for a certain margin after the cavity is filled, inhibiting residue suspended above the molten metal from entering the cavity.

[0036] The pouring cup 110 includes a cup bottom 111 and a side wall 112 surrounding the cup bottom 111. The cup bottom 111 and the side wall 112 together form a receiving tank for containing molten metal, and the receiving tank has an opening for the molten metal to enter. A siphon runner 120 connects the cup bottom 111 and the sprue 200. The siphon runner 120 curves upward, and the height of the highest point of the siphon runner 120 is greater than the height of the cup bottom 111 located in the receiving tank. Specifically, the height difference between the siphon runner 120 and the cup bottom 111 creates a negative pressure at the siphon runner 120, attracting pure molten metal to flow downward, while residue remains above the liquid surface of the molten metal in the cup bottom 111 due to its low density or surface tension.

[0037] The siphon gating system 120 includes a first straight pipe 121, a first bent pipe 122, and a second straight pipe 123. The cup bottom 111, the first straight pipe 121, the first bent pipe 122, the second straight pipe 123, and the sprue 200 are connected in sequence. The height of the first bent pipe 122 is greater than the height of the cup bottom 111 located in the receiving tank. Specifically, the function of the first straight pipe 121 is to transport the molten metal from the pouring cup 110 to the first bent pipe 122 under the siphon effect, and then connect the first bent pipe 122 and the sprue 200 through the second straight pipe 123 to realize the transportation of the molten metal.

[0038] The working process of the siphon slag collection mechanism 100 is as follows: When the molten metal is poured into the pouring cup 110, the siphon effect begins to occur as the liquid level rises steadily to the height of the first bend 122. Since the horizontal height of the outlet on the pouring cup 110 is lower than the horizontal height of the first bend 122 in the siphon runner 120, the molten metal flows within the siphon runner 120 under the influence of gravity and atmospheric pressure. During the flow of the molten metal, due to the low residual density, the residue gradually floats to the surface.

[0039] For example, in actual production, when molten metal is poured into pouring cup 110 at a flow rate of 0.5 L / s, after about 10 seconds, the surface of the molten metal rises to the height of the first bend 122. At this point, a siphon effect occurs, and the molten metal begins to flow within the siphon runner 120. During these 10 seconds, some of the less dense residue begins to float to the surface of the molten metal in pouring cup 110. As the molten metal continues to flow, more residue continues to float to the surface, eventually accumulating on the surface of the molten metal in pouring cup 110, thus achieving separation of the molten metal from the residue.

[0040] In one embodiment, the bending angle of the first bend 122 is between 90 and 150 degrees. This bending angle facilitates the smooth flow of the molten metal into the subsequent gating system 200, while simultaneously slowing the flow rate of the molten metal, thus creating conditions for the molten metal to settle and separate.

[0041] The gating structure also includes a first buffer section 400, which comprises a third straight pipe 410 and a second bent pipe 420. The second bent pipe 420 bends downwards, and the third straight pipe 410 and the second bent pipe 420 are sequentially connected between the cup bottom 111 and the first straight pipe 121. Specifically, the first buffer section 400 formed by the third straight pipe 410 and the second bent pipe 420 can buffer and regulate the flow rate and direction of the molten metal. When the molten metal flows in the siphon gating 120, it will generate a certain impact force on the pipes and related components, especially in areas where the flow rate is high or the flow direction changes suddenly. The presence of the first buffer section 400 can effectively disperse this impact force, reduce the wear of the molten metal on the pipes, and extend the service life of the pipes. At the same time, the first buffer section 400 can also make the flow of the molten metal more stable, which helps the molten metal to settle and separate better in the siphon gating 120.

[0042] In this embodiment, the length of the first buffer section 400 is less than the length of the siphon gating channel 120. The first buffer section 400 is generally in the shape of an "n", and the radius of the two curved parts is designed to be 15mm to 40mm. The length of the first buffer section 400 is adapted to the length of the siphon gating channel 120. This design can ensure the buffering effect of the molten metal without affecting the normal flow of the molten metal.

[0043] The gating structure also includes a runner 500 and a filter 600. Multiple ingates 300 are provided. The runner 500 connects the sprue 200 and the multiple ingates 300, and the filter 600 is located within the runner 500. Specifically, the runner 500 connects the sprue 200 and the multiple ingates 300 to distribute the molten metal in the sprue 200 to the multiple ingates 300, avoiding excessively fast or slow flow rates in certain areas. The filter 600 is installed in the runner 500. After the siphon slag collection mechanism 100 separates most of the residue, the filter 600 performs secondary filtration of the molten metal, further reducing the residue content in the molten metal and providing double assurance for the quality of the casting. Since the siphon slag collection mechanism 100 has separated most of the residue, the amount of residue in the molten metal entering the filter 600 is greatly reduced. This not only reduces the impact of the residue on the filter 600 and extends the service life of the filter 600, but also further reduces the content of residue in the molten metal and improves the quality of the casting.

[0044] In this embodiment, the selected filter 600 is a ceramic mesh filter 600 with a mesh size of 2mm × 2mm. This filter 600 can effectively filter out residues larger than the mesh size. The filter 600 is tightly installed in the runner 500 by interference fit, ensuring that the molten metal must pass through the filter 600 when flowing through the runner 500, and no bypass phenomenon will occur.

[0045] In one embodiment, the cross-sectional area of ​​the runner 500 gradually decreases from the end near the filter 600 to the end near the sprue 200 and / or the ingate 300. Specifically, the runner 500 is designed in a flat trapezoidal shape. This flat trapezoidal design allows the molten metal to form a smaller suction area during flow, which helps the runner 500 to perform its slag-blocking function, while also increasing the installation space of the runner 500 to facilitate the installation of the filter 600.

[0046] In this design, the end of the ingate 300 away from the sprue 200 bends upward to form a second buffer section 310. The second buffer section 310 can further reduce the flow rate of the molten metal, thereby reducing the impact on the mold cavity.

[0047] The gating structure also includes a pipe joint 700, which connects the second buffer section 310 to the mold cavity. In the cross-section of the pipe joint 700, its length is greater than its width. By placing the pipe joint 700 between the second buffer section 310 and the mold cavity, the molten metal can be poured into the cavity uniformly at a suitable flow rate and volume. For example, the pipe joint 700 has a length of 15 mm and a width of 5 mm to ensure that the molten metal fills the cavity smoothly during pouring, avoiding turbulence, splashing, and other phenomena, thereby ensuring the molding quality of the casting. In actual production, by adjusting the dimensions of the pipe joint 700, the pouring speed of the molten metal can be controlled at approximately 2 L / s, effectively preventing defects such as porosity and sand holes in the casting.

[0048] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0049] Furthermore, the use of terms such as "first," "second," and "a" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0050] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0051] Furthermore, the technical solutions of the various embodiments of this application can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this application.

Claims

1. A siphon-type slag removal gating structure for pouring molten metal into the cavity of a die-casting machine, characterized in that, The gating structure includes a siphon slag collection mechanism, a direct gating channel, and an inner gating channel; The siphon slag collection mechanism includes a pouring cup and a siphon runner, wherein the siphon runner, the direct runner, and the ingate are sequentially connected between the pouring cup and the cavity; When the molten metal in the pouring cup passes through the siphon gating channel, the residue in the molten metal can be suspended above the molten metal in the pouring cup under the siphon effect.

2. The siphon slag removal gating structure according to claim 1, characterized in that, The pouring cup includes a cup bottom and a side circumference surrounding the cup bottom. The cup bottom and the side circumference together form a receiving groove for receiving molten metal. The siphon gating channel is connected between the cup bottom and the direct gating channel. The siphon gating channel curves upward, and the height of the highest point of the siphon gating channel is greater than the height of the bottom of the cup located in the receiving groove.

3. The siphon slag removal gating structure according to claim 2, characterized in that, The siphon gating system includes a first straight pipe, a first bent pipe, and a second straight pipe. The cup bottom, the first straight pipe, the first bent pipe, the second straight pipe, and the gating system are connected in sequence. The height of the first bent pipe is greater than the height of the cup bottom located in the receiving groove.

4. The siphon slag removal gating structure according to claim 3, characterized in that, The bending angle of the first bend is 90 degrees to 150 degrees.

5. The siphon slag removal gating structure according to claim 3, characterized in that, The gating structure also includes a first buffer section, which includes a third straight pipe and a second bent pipe. The second bent pipe bends downward, and the third straight pipe and the second bent pipe are connected sequentially between the bottom of the cup and the first straight pipe.

6. The siphon slag removal gating structure according to claim 5, characterized in that, The length of the first buffer section is less than the length of the siphon channel.

7. The siphon slag removal gating structure according to claim 1, characterized in that, The gating structure also includes a horizontal gating system and a filter. Multiple inlets are provided. The horizontal gating system connects the sprue and the multiple inlets. The filter is located in the horizontal gating system.

8. The siphon slag removal gating structure according to claim 7, characterized in that, The cross-sectional area of ​​the sprue gradually decreases from the end near the filter toward the end near the sprue and / or the ingate.

9. The siphon slag removal gating structure according to claim 1, characterized in that, The end of the ingate away from the sprue bends upward to form a second buffer section.

10. The siphon slag removal gating structure according to claim 9, characterized in that, The gating structure also includes a pipe joint, which is connected between the second buffer section and the cavity. In the cross-section of the pipe joint, the length of the pipe joint is greater than the width of the pipe joint.

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