A mould cavity argon gas protection pouring method and its device

Abstract

The application provides a cavity argon gas protection pouring method and device, and specifically comprises the following steps: argon gas is connected from a main pipeline and enters a branch pipeline; a sand box is transferred to a corresponding position of a flow line, the end of the branch pipeline is inserted into the sand box, and gas is allowed to enter; upper and lower sand boxes are arranged, two small holes are formed in the top of the upper sand box, argon gas is introduced into one of the small holes, and gas is extracted from the other small hole; the gas extracted from the one small hole is sprayed towards the outside of a pouring opening of the upper sand box, and the outside of the pouring opening is filled with an argon gas atmosphere. The application aims to provide a cavity argon gas protection pouring method and device, which can introduce protective gas into the cavities of multiple casting molds, directly protects the metal liquid in the cavities of the casting molds, avoids slag or pore defects of the casting, and saves argon gas resources.

Description

Technical Field

[0001] This invention belongs to the field of metallurgical casting gas protection molten metal technology, specifically relating to a casting method and apparatus for cavity argon protection. Background Technology

[0002] Casting is one of the fundamental processes in modern machinery manufacturing. It involves pouring molten metal into a mold cavity, where it cools and solidifies to obtain parts with the desired shape and properties. Several technical challenges exist during the pouring of molten metal into the mold cavity:

[0003] (1) If the molten metal is exposed to air, it is easy to undergo secondary oxidation. At the same time, if the cavity contains a large amount of air and the gas cannot be quickly discharged from the cavity, it will increase the gas pressure at the cavity interface. The gas will then invade the molten metal, causing slag or porosity defects in the casting, thus affecting the quality of the casting.

[0004] (2) For chemically active metal materials, such as magnesium alloy castings, gas protection in the molding process mainly protects the molten metal in the crucible, but does not directly protect the molten metal in the casting cavity. The molten metal entering the casting cavity is still easy to react with the air.

[0005] (3) The current common practice is to introduce protective gas (such as argon) into the casting cavity. However, for manufacturing companies, the number of castings is very large. If multiple protective gas devices are set up, the production cost will be very high. Therefore, how to introduce protective gas into the cavity of multiple castings and reduce the cost has become the key technical problem to be solved in this solution.

[0006] Therefore, this application proposes a casting method and apparatus with argon-filled cavity protection to simultaneously solve the above-mentioned technical problems. Summary of the Invention

[0007] The purpose of this invention is to provide a casting method and apparatus for argon-filled cavity protection, which solves the technical problem of how to introduce protective gas into the cavities of multiple casting molds, realizes the function of directly protecting the molten metal in the casting cavity, avoids slag or porosity defects in the casting, and saves argon resources.

[0008] A casting method with argon-filled cavity protection specifically includes the following steps:

[0009] Step S1: Argon gas is introduced from the main pipeline and enters the branch pipeline;

[0010] Step S2: Move the sand box to the corresponding position on the production line, insert the end of the branch pipe into the sand box to allow gas to enter;

[0011] Step S3: An upper sand box and a lower sand box are set up. Two small holes are made at the top of the upper sand box. Argon gas is introduced into one of the small holes and the gas is extracted from the other small hole.

[0012] Step S4: Gas extracted from one of the fine holes is sprayed toward the outside of the pouring port of the upper sand box, so that the outside of the pouring port is filled with an argon atmosphere.

[0013] A casting device for cavity argon filling protection includes an argon gas supply pipeline, the argon gas supply pipeline includes a main pipeline and a branch pipeline connected to the main pipeline, one end of the branch pipeline passes through a support frame, the support frame is connected to a screw drive mechanism, and one end of the branch pipeline is connected to a lifting mechanism, the lifting mechanism is mounted on the support frame;

[0014] The upright frame is equipped with an argon gas circulation structure, which is connected to the lifting mechanism. The upright frame is also equipped with a limiting structure for determining the positions of the upper and lower sand boxes.

[0015] The lifting mechanism includes a vertically arranged lifting cylinder and a positioning plate connected to the free end of the lifting cylinder, with one end of the branch pipe passing through the positioning plate.

[0016] The argon gas circulation structure includes a suction tube 1 with one end passing through the positioning plate, a suction tube 2 connected to the other end of the suction tube 1 on the side, a fixing groove plate set at one end of the suction tube 2, a pressure sensor 1 set in the fixing groove plate, and a micro pump set at the other end of the suction tube 2. The micro pump is fixed on the upright.

[0017] The argon gas circulation structure also includes a guide tube connected to the micro pump. The guide tube includes a vertically arranged cylinder body, a side tube with one end perpendicularly connected to the side of the cylinder body, and a limiting ring coaxially arranged at the lower end of the cylinder body. The bottom end of the cylinder body is embedded in the pouring port, and the other end of the side tube is connected to the micro pump.

[0018] The limiting structure includes a vertically arranged upright, a horizontal bar with one end perpendicularly connected to the top of the upright, a horizontally rotating rod with one end perpendicularly connected to the other end of the horizontal bar, and a baffle horizontally arranged above the rotating rod. The upright and the rotating rod are arranged vertically. The other end of the rotating rod is connected to a motor shaft. The motor shaft is connected to a motor, and the motor is mounted on the upright.

[0019] A pressure sensor 2 is installed at the bottom of the pole.

[0020] The lead screw transmission mechanism includes a lead screw and a guide column connected to one end of a protruding block, and a second motor connected to one end of the lead screw. The other end of the lead screw and the guide column passes through the upright frame, and the second motor is mounted on the protruding block.

[0021] The positive effects of this invention are as follows:

[0022] (1) In this scheme, by setting up the main pipeline and branch pipeline for argon gas, as well as the upper and lower sand boxes that flow on the production line, it is possible to achieve the effect of introducing protective gas into the cavities of multiple molds, thereby reducing costs.

[0023] (2) It is equipped with an argon gas circulation structure, which has the following technical advantages:

[0024] Firstly, when argon gas in the branch pipe enters the mold through one of the small holes, because argon gas is denser than air, it sinks in the mold and draws gas from the other small hole, which helps to quickly expel the rising air, ultimately allowing argon gas to quickly fill the entire cavity.

[0025] Secondly, the gas extracted from one of the fine holes is sprayed towards the outside of the pouring port, so that the pouring port is filled with an argon atmosphere, preventing air from entering the pouring port. At the same time, when pouring the molten metal, the molten metal is surrounded by argon, which helps to resist oxidation.

[0026] (3) Setting a limit structure has the following technical effects:

[0027] First, a pressure sensor is installed at the bottom end of the upright. When the sand box moves to touch the pressure sensor, the conveying process of the upper and lower sand boxes stops.

[0028] Secondly, a baffle is installed at the upper end of the rotating rod. When the argon gas injection in the branch pipe stops, one end of the branch pipe abuts against the upper surface of the baffle to prevent the argon gas from escaping due to the valve not being closed tightly. Attached Figure Description

[0029] Figure 1 This is a three-dimensional structural diagram of the casting device in this invention. Figure 1 .

[0030] Figure 2 This is a three-dimensional structural diagram of the casting device in this invention. Figure 2 .

[0031] Figure 3 This is a schematic diagram of the argon gas circulation structure in this invention.

[0032] Figure 4 This is a schematic diagram of the limiting structure in this invention.

[0033] Figure 5 This is a schematic diagram of the lead screw transmission mechanism in this invention.

[0034] Figure 6 This is a schematic diagram of the guide tube structure in this invention.

[0035] Figure 7 This is a schematic diagram of the connection structure between the upper and lower sand boxes in this invention.

[0036] The attached diagram is labeled as follows: 1. Conveyor belt; 2. Lower sand box; 3. Upper sand box; 31. Pouring port; 32. Fine hole; 4. Guide cylinder; 41. Vertical cylinder body; 42. Side pipe; 43. Limiting ring; 5. Main pipeline; 6. Limiting structure; 61. Upright rod; 62. Crossbar; 63. Baffle plate; 64. Rotating rod; 7. Lifting cylinder; 71. Positioning plate; 8. Branch pipeline; 9. Motor 1; 10. Suction pipe 1; 101. Suction pipe 2; 102. Pressure sensor 1; 103. Fixed groove plate; 104. Micro pump; 11. Support; 12. Protruding block; 121. Guide column; 13. Motor 2; 14. Lead screw; 15. Frame; 151. Opening groove; 152. Roller. Detailed Implementation

[0037] To more clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0038] See Figures 1-7 A casting method with argon-filled cavity protection specifically includes the following steps:

[0039] Step S1: Argon gas is introduced from the main pipe 5 and enters the branch pipe 8;

[0040] Step S2: Move the sand box to the corresponding position on the production line, insert the end of the branch pipe 8 into the sand box to allow gas to enter;

[0041] Step S3: An upper sand box 3 and a lower sand box 2 are set up. Two small holes 32 are opened at the top of the upper sand box 3. Argon gas is introduced into one of the small holes 32 and gas is extracted from the other small hole 32.

[0042] Step S4: Gas extracted from one of the fine holes is sprayed toward the outside of the pouring port 31 of the upper sand box 3, so that the outside of the pouring port 31 is filled with an argon atmosphere.

[0043] See Figures 1-7 A casting device for cavity argon filling protection includes an argon gas supply pipeline, the argon gas supply pipeline includes a main pipeline 5 and a branch pipeline 8 connected to the main pipeline 5. One end of the branch pipeline 8 passes through a support frame 15, the support frame 15 is connected to a screw drive mechanism, and one end of the branch pipeline 8 is connected to a lifting mechanism, the lifting mechanism is mounted on the support frame 15.

[0044] An argon gas circulation structure is provided on the upright frame 15, which is connected to the lifting mechanism. A limiting structure 6 is also provided on the upright frame 15 to determine the position of the upper sand box 3 and the lower sand box 2.

[0045] Ideally, the main pipe 5 is fixed on the support 11.

[0046] The lifting mechanism includes a vertically arranged lifting cylinder 7, a positioning plate 7 connected to the free end of the lifting cylinder 7, and one end of the branch pipe 8 passing through the positioning plate 7.

[0047] The argon gas circulation structure includes a suction pipe 10 with one end passing through the positioning plate 7, a suction pipe 2 101 connected to the other end of the suction pipe 10, a fixing groove plate 103 at one end of the suction pipe 2 101, a pressure sensor 102 in the fixing groove plate 103, and a micro pump 104 at the other end of the suction pipe 2 101. The micro pump 104 is fixed on the stand 15.

[0048] The argon circulation structure also includes a guide tube 4 connected to the micro pump 104. The guide tube 4 includes a vertically arranged cylinder body 41, a side tube 42 with one end vertically connected to the side of the cylinder body 41, and a limiting ring 43 coaxially arranged at the lower end of the cylinder body 41. The bottom end of the cylinder body 41 is embedded in the pouring port 31, and the other end of the side tube 42 is connected to the micro pump 104.

[0049] The limiting structure 6 includes a vertically arranged upright 61, a horizontal bar 62 with one end perpendicularly connected to the top of the upright 61, a horizontally rotating rod 64 with one end perpendicularly connected to the other end of the horizontal bar 62, and a baffle 63 horizontally arranged above the rotating rod 64. The upright 61 and the rotating rod 64 are arranged vertically. The other end of the rotating rod 64 is connected to the motor shaft. The motor shaft is connected to the motor 9. The motor 9 is mounted on the upright 15.

[0050] Pressure sensor 2 is installed at the bottom of pole 61.

[0051] More preferably, an opening slot 151 is provided on one side of the upright frame 15, and one end of the rotating rod 64 is rotatably disposed in the opening slot 151; a roller 152 is provided at the bottom end of the upright frame 15.

[0052] The lead screw transmission mechanism includes a lead screw 14 and a guide post 121 connected to one end of the protruding block 12, and a second motor 13 connected to one end of the lead screw 14. The other end of the lead screw 14 and the guide post 121 passes through the upright frame 15, and the second motor 13 is mounted on the protruding block 12.

[0053] More preferably, the power system in this solution is connected to the PLC controller, which is achievable by those skilled in the art and will not be described in detail here.

[0054] The specific working process of this invention:

[0055] In use, the lower sand box 2 and the upper sand box 3 are placed on the conveyor belt 1 through the conveyor system, and the lower sand box 2 and the upper sand box 3 are transported to the upright 15 position, where they are blocked by the limiting structure 6. A pressure sensor 2 is set at the bottom of the upright 61. When the pressure sensor 2 senses the pressure, it transmits the pressure signal to the microcontroller to control the conveyor system to stop working.

[0056] At this time, under the action of motor 9, the limiting structure 6 is rotated by a certain angle through the motor shaft, so that the upright 61 is separated from the lower sand box 2 and the upper sand box 3.

[0057] Then, motor 2 13 works, driving the upright frame 15 to move through the screw transmission mechanism. One end of suction tube 2 101 is closed and abuts against the outside of the lower sand box 2. Pressure sensor 102 on the fixed slot plate 103 also abuts against the lower sand box 2. Pressure sensor 102 senses the pressure and transmits the signal to the microcontroller, controlling motor 2 13 to stop working.

[0058] At this time, the lifting mechanism works. Under the action of the lifting cylinder 7, the positioning plate 7 descends. One end of the branch pipe 8 and the suction pipe 10 are respectively connected to two small holes 32 on the upper sand box 3. The branch pipe 8 injects argon gas into one of the small holes 32, and the suction pipe 10 extracts air from the other small hole 32. It should be noted that the suction pipe 10 extracts air from the other small hole 32 in the early stage. As the argon gas fills the cavity, the argon gas is extracted in the later stage. At this time, the area near the pouring port 31 will be filled with an argon atmosphere.

[0059] Under the action of the micro pump 104, the gas extracted from one of the fine holes 32 is sprayed toward the guide tube 4. That is, the side tube 42 on the guide tube 4 is connected to the micro pump 104, and the gas is sprayed out through the inner end of the side tube 42, so that the guide tube 4 is filled with an argon atmosphere.

[0060] The technical features of this invention not described can be implemented by or using existing technology, and will not be repeated here. Of course, the above description is not a limitation of this invention, and this invention is not limited to the examples above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this invention should also be within the protection scope of this invention.

Claims

1. A casting apparatus for cavity argon filling protection, comprising an argon gas supply pipeline, wherein the argon gas supply pipeline includes a main pipeline (5) and a branch pipeline (8) connected to the main pipeline (5), characterized in that, One end of the branch pipe (8) passes through the frame (15), the frame (15) is connected to the screw drive mechanism, and one end of the branch pipe (8) is connected to the lifting mechanism, the lifting mechanism is mounted on the frame (15); An argon gas circulation structure is provided on the upright frame (15), and the argon gas circulation structure is connected to the lifting mechanism. A limiting structure (6) is also provided on the upright frame (15) to determine the position of the upper sand box (3) and the lower sand box (2). The lifting mechanism includes a vertically arranged lifting cylinder (7) and a positioning plate (71) connected to the free end of the lifting cylinder (7). One end of the branch pipe (8) passes through the positioning plate (71). The argon gas circulation structure includes a suction tube (10) with one end passing through the positioning plate (71), a suction tube (101) with its side connected to the other end of the suction tube (10), a fixing groove plate (103) at one end of the suction tube (101), a pressure sensor (102) in the fixing groove plate (103), and a micro pump (104) at the other end of the suction tube (101). The micro pump (104) is fixed on the stand (15). The argon gas circulation structure also includes a guide tube (4) connected to the micro pump (104). The guide tube (4) includes a vertically arranged cylinder body (41), a side tube (42) with one end vertically connected to the side of the cylinder body (41), and a limiting ring (43) coaxially arranged at the lower end of the cylinder body (41). The bottom end of the cylinder body (41) is embedded in the pouring port (31), and the other end of the side tube (42) is connected to the micro pump (104). The limiting structure (6) includes a vertically arranged upright (61), a horizontal bar (62) with one end vertically connected to the top of the upright (61), a horizontally rotating rod (64) with one end vertically connected to the other end of the horizontal bar (62), and a baffle (63) horizontally arranged above the rotating rod (64). The upright (61) and the rotating rod (64) are arranged vertically. The other end of the rotating rod (64) is connected to the motor shaft. The motor shaft is connected to the first motor (9). The first motor (9) is arranged on the upright (15). A pressure sensor is installed at the bottom of the pole (61).

2. The casting apparatus for argon-filled cavity protection according to claim 1, characterized in that, The lead screw transmission mechanism includes a lead screw (14) and a guide column (121) connected to a protruding block (12) at one end, and a second motor (13) connected to one end of the lead screw (14). The other end of the lead screw (14) and the guide column (121) passes through the upright frame (15), and the second motor (13) is mounted on the protruding block (12).

3. A casting method with argon-filled cavity protection, employing the casting apparatus with argon-filled cavity protection as described in any one of claims 1-2, characterized in that, Specifically, the steps include the following: Step S1: Argon gas is introduced from the main pipeline (5) and enters the branch pipeline (8); Step S2: Move the sand box to the corresponding position on the production line, insert the end of the branch pipe (8) into the sand box to allow gas to enter; Step S3: An upper sand box (3) and a lower sand box (2) are set up. Two small holes (32) are opened at the top of the upper sand box (3). Argon gas is introduced into one of the small holes (32) and gas is extracted from the other small hole (32). Step S4: Gas extracted from one of the fine holes (32) is sprayed toward the outside of the pouring port (31) of the upper sand box (3) so that the outside of the pouring port (31) is filled with an argon atmosphere.

Images