Low-pressure casting mold for front auxiliary frame

Abstract

The utility model belongs to the technical field of low-pressure casting molds, and particularly discloses a front auxiliary frame low-pressure casting mold which comprises a mold body, a crucible is arranged at the bottom of the mold body, a liquid rising pipe is arranged in the crucible, the inner diameter of the crucible is gradually increased from top to bottom, the top of the crucible is communicated with a connecting pipe, and an air pump is arranged on one side of the crucible. An air outlet pipe is arranged at one end of the sucking pump; an anti-blocking assembly is arranged in the riser tube, the anti-blocking assembly comprises a heating part and a filtering part, the heating part is used for conducting heating and heat preservation on the top end of the riser tube and comprises a heating layer, the top end of the riser tube is sleeved with the heating layer, and a resistance heating wire is arranged in the heating layer; gas entering the crucible when molten metal is added is pumped out from the crucible through the connecting pipe at one end of the sucking pump, the air humidity and the impurity content in the crucible are reduced, and the situation that excessive gas is mixed into the molten metal in the mold filling process of the molten metal, and the quality of castings is affected is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of low-pressure casting molds, and more particularly to a low-pressure casting mold for a front subframe. Background Art

[0002] With the rapid development of the automotive industry, the quality and performance requirements for automotive parts are constantly increasing. As a crucial component of the vehicle chassis, the front subframe's structural strength and stability directly impact the vehicle's driving safety and comfort. Low-pressure casting technology has been widely used in automotive parts manufacturing due to its advantages, including dense casting structure, excellent mechanical properties, and high production efficiency. The front subframe low-pressure casting mold is a key piece of equipment for low-pressure casting production, and its design and manufacturing quality directly determine the quality and production efficiency of the front subframe.

[0003] When the existing low-pressure casting device is in use, when adding molten metal to the crucible, it is usually added from the feed port. However, when the molten metal is added, external air will enter the crucible along with the addition of the molten metal, which will increase the humidity of the air inside the crucible. The increase in humidity will increase the water vapor in the air, which may decompose in the high-temperature molten metal to produce hydrogen. Hydrogen has a certain solubility in the molten metal. When the molten metal solidifies, the solubility of hydrogen drops sharply and it will escape from the molten metal to form pores. These pores will reduce the density of the casting and affect its strength and corrosion resistance. Utility Model Content

[0004] In order to solve the above problems, the present application provides a low-pressure casting mold for a front subframe.

[0005] The low-pressure casting mold for the front subframe provided in this application adopts the following technical solution:

[0006] The low-pressure casting mold for the front subframe includes a mold body, a crucible is provided at the bottom of the mold body, a liquid riser is provided inside the crucible, the inner diameter of the crucible gradually increases from top to bottom, a connecting pipe is provided at the top of the crucible, an air pump is provided on one side of the crucible, and an air outlet pipe is provided at one end of the air pump;

[0007] An anti-clogging component is provided inside the riser pipe.

[0008] Through the above technical solution, the connecting pipe at one end of the vacuum pump extracts the gas entering when the molten metal is added from the crucible, which can reduce the air humidity and impurity content in the crucible, and avoid excessive gas mixing into the molten metal during the molten metal filling process, thereby preventing the quality of the casting from being affected.

[0009] Furthermore, the anti-clogging component includes a heating component and a filtering component. The heating component is used to heat and insulate the top end of the riser tube. The heating component includes a heating layer, which is sleeved on the top end of the riser tube. A resistance heating wire is provided inside the heating layer.

[0010] The filter component is used to filter impurities in the molten metal, and includes a filter screen. The filter screen is located at the bottom of the riser pipe, and the riser pipe and the filter screen are detachably connected;

[0011] The bottom end of the liquid rising pipe is provided with an annular groove, and the top of the filter screen is provided with a clamping block.

[0012] Through the above technical solution, the heating component heats and insulates the top of the riser tube, so that the temperature of the top of the riser tube is always higher than the solidification point of the molten metal, preventing the molten metal from solidifying at the top to form waste, thereby avoiding clogging of the riser tube, and the filtering component can filter impurities inside the molten metal, reduce the accumulation of impurities in the riser tube, and further reduce the risk of clogging of the riser tube.

[0013] Furthermore, the clamping block is interference-fitted with the annular groove.

[0014] Furthermore, two plates are provided on the top of the mold body, a cylinder is provided between the two plates, multiple electric push rods are provided between one of the plates and the mold body, and a pressure pipe and a pressure relief pipe are respectively connected at both ends of the crucible, and a secondary dehumidification net is provided inside the pressure pipe.

[0015] Through the above technical solution, the pressure tube and the pressure relief tube respectively connected to the two ends of the crucible are used to control the pressure inside the crucible.

[0016] Furthermore, the bottom of the cylinder is connected to an upper mold, and a lower mold is provided inside the mold body.

[0017] Furthermore, a fixing ring is provided at the bottom of the heating layer, a plurality of connecting rods are provided at the bottom of the fixing ring, and a plurality of elastic beads are provided at the bottom of the connecting rods.

[0018] Furthermore, a plurality of limiting grooves are provided inside the crucible, and a plurality of connecting rods and elastic beads are matched with corresponding limiting grooves respectively.

[0019] Through the above technical solution, the setting of the connecting rod and the elastic beads makes the rising tube detachable, which can be cleaned and maintained regularly to ensure the cleanliness of the inside of the rising tube and facilitate cleaning when blockage occurs inside the rising tube.

[0020] Furthermore, a positioning groove is provided at the bottom of the lower mold, a positioning ring is provided at the top of the liquid rising tube, the positioning ring is plugged into the positioning groove, and a liquid inlet channel is provided inside the lower mold, which is connected to the liquid rising tube.

[0021] Through the above technical solution, the positioning ring is plugged into the positioning groove, ensuring that the connection position between the rising tube and the lower mold is accurate. After the molten metal flows out of the rising tube, it enters the cavity formed by the lower mold and the upper mold through the liquid inlet channel connected to the inside of the lower mold. The plug-in cooperation between the positioning ring and the positioning groove ensures that the molten metal can accurately flow into the liquid inlet channel, avoiding leakage or inaccurate flow direction.

[0022] In summary, this application includes at least one of the following beneficial technical effects:

[0023] (1) The utility model extracts the gas that enters the crucible when the molten metal is added through the connecting pipe at one end of the vacuum pump, thereby reducing the air humidity and impurity content in the crucible, and preventing excessive gas from mixing into the molten metal during the molten metal filling process, thereby affecting the quality of the casting.

[0024] (2) The present invention heats and insulates the top of the riser pipe by means of a heating component in the anti-clogging assembly, so that the temperature at the top of the riser pipe is always higher than the solidification point of the molten metal, thereby preventing the molten metal from solidifying at the top to form waste, thereby avoiding clogging of the riser pipe. The filtering component can filter impurities inside the molten metal, reducing the accumulation of impurities in the riser pipe, further reducing the risk of clogging of the riser pipe and minimizing the impact on the production process.

[0025] (3) The utility model makes the riser pipe detachable by setting the connecting rod and the elastic bead, which can be cleaned and maintained regularly to ensure the cleanliness of the inside of the riser pipe and facilitate cleaning when blockage occurs inside the riser pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0027] Figure 2 This is a schematic diagram of the connection structure between the upper mold and the lower mold of the utility model;

[0028] Figure 3 This is a schematic diagram of the connection structure between the mold body and the crucible of the present invention;

[0029] Figure 4 This is a schematic diagram of the internal structure of the crucible of the present invention;

[0030] Figure 5 It is a partial plan view of the utility model;

[0031] Figure 6 This is a schematic diagram of the connection structure between the liquid riser and the filter screen of the utility model;

[0032] Figure 7 For the utility model Figure 5 A magnified view of the structure in the middle.

[0033] Explanation of the accompanying symbols: 1. Mold body; 2. Upper mold; 3. Cylinder; 4. Crucible; 5. Pressurizing pipe; 6. Pressure relief pipe; 7. Lower mold; 8. Lifting pipe; 9. Positioning ring; 10. Heating layer; 11. Fixing ring; 12. Electric push rod; 13. Connecting rod; 14. Elastic bead; 15. Liquid inlet channel; 16. Annular groove; 17. Filter screen; 18. Block; 19. Vacuum pump; 20. Connecting pipe; 21. Secondary dehumidification screen. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application; it is obvious that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0035] Reference Figure 1-Figure 7 The front subframe low-pressure casting mold includes a mold body 1, a crucible 4 is provided at the bottom of the mold body 1, a liquid riser 8 is provided inside the crucible 4, the inner diameter of the crucible 4 gradually increases from top to bottom, a connecting pipe 20 is provided at the top of the crucible 4, an air pump 19 is provided on one side of the crucible 4, and an air outlet pipe is provided at one end of the air pump 19;

[0036] An anti-clogging component is provided inside the riser pipe 8.

[0037] The feed port for adding the molten metal to the crucible 4 is of the prior art and is not shown in the figure. The molten metal is added from the feed port of the crucible 4. After the addition is completed, the feed port is closed. Because when the molten metal is added, the feed port is opened, and the external gas will enter the crucible 4 with the addition of the molten metal, so that the humidity of the air inside the crucible increases. At this time, the vacuum pump 19 on one side of the crucible 4 starts to work, and the vacuum pump 19 extracts gas from the crucible 4 through the connecting pipe 20. The extracted gas can reduce the air humidity and impurity content in the crucible 4, and avoid excessive gas mixing into the molten metal during the molten metal filling process, which affects the quality of the casting.

[0038] The inner diameter of the crucible 4 gradually increases from top to bottom, and the gas in the crucible 4 will naturally converge toward the top, reducing the airflow resistance during the extraction process, and can more effectively extract the gas in the crucible 4.

[0039] After the vacuum is completed, a certain low pressure is applied to the inside of the crucible 4 through an external pressure control system (not shown in the figure), and then the air is dried through an external dryer (not shown in the figure). Since the riser tube 8 at the bottom of the crucible 4 is connected to the mold cavity, under the action of the pressure difference, the molten metal in the crucible 4 will rise through the riser tube 8. First, the inner diameter of the crucible 4 gradually increases from top to bottom. This design helps the molten metal to be better pushed upward under the action of pressure at the bottom of the crucible 4, because the relatively small inner diameter of the bottom makes the molten metal subject to a more concentrated upward force under the same pressure, which is conducive to the rise of the molten metal.

[0040] Reference Figure 5-Figure 7 , an anti-clogging component, including a heating component and a filtering component, the heating component is used to heat and keep the top of the rising pipe 8 warm, including a heating layer 10, the heating layer 10 is sleeved on the top of the rising pipe 8, and a resistance heating wire is provided inside the heating layer 10;

[0041] The filter component is used to filter impurities in the molten metal, and includes a filter screen 17. The filter screen 17 is located at the bottom of the riser pipe 8. The riser pipe 8 and the filter screen 17 are detachably connected.

[0042] An annular groove 16 is provided at the bottom end of the liquid rising pipe 8 , and a clamping block 18 is provided at the top of the filter screen 17 .

[0043] When the mold begins operating, the resistance heating wires within heating layer 10 are energized, generating heat. Because heating layer 10 is positioned over the top of riser tube 8, heat is directly transferred to the top region of riser tube 8, maintaining its temperature above the solidification point of the molten metal. This effectively prevents the molten metal from solidifying at the top of riser tube 8 due to a drop in temperature, thus preventing clogging of the riser tube 8.

[0044] When the molten metal flows from the crucible 4 into the mold through the riser tube 8 , the filter screen 17 at the bottom of the riser tube 8 filters the impurities in the molten metal.

[0045] The top of the riser pipe 8 is heated and insulated by the heating component in the anti-clogging assembly, so that the temperature of the top of the riser pipe 8 is always higher than the solidification point of the molten metal, preventing the molten metal from solidifying at the top to form waste, thereby avoiding clogging of the riser pipe 8. The filtering component can filter impurities inside the molten metal, reduce the accumulation of impurities in the riser pipe 8, and further reduce the risk of clogging of the riser pipe 8.

[0046] Reference Figure 5-Figure 6 The bottom end of the rising pipe 8 is provided with an annular groove 16 , and the top of the filter screen 17 is provided with a clamping block 18 , which is interference fit with the annular groove 16 .

[0047] The block 18 on the top of the filter screen 17 is interference fit with the annular groove 16 at the bottom end of the riser pipe 8, realizing a detachable connection between the riser pipe 8 and the filter screen 17, which is convenient for replacement and cleaning when the filter screen 17 is blocked or damaged.

[0048] Reference Figure 1-Figure 2 Two plates are provided on the top of the mold body 1, and a cylinder 3 is provided between the two plates. Multiple electric push rods 12 are provided between one of the plates and the mold body 1. The two ends of the crucible 4 are respectively connected with a pressure pipe 5 and a pressure relief pipe 6. A secondary dehumidification net 21 is provided inside the pressure pipe 5. The bottom of the cylinder 3 is connected to the upper mold 2, and a lower mold 7 is provided inside the mold body 1.

[0049] When the mold needs to be opened, the electric push rod 12 rises, driving the upper plate to rise, and at the same time the cylinder 3 contracts, pulling the upper mold 2 upward, separating the upper mold 2 from the lower mold 7, and completing the mold opening action. When the mold needs to be closed for casting, the electric push rod 12 descends, pushing the upper plate down, and the cylinder 3 extends to push the upper mold 2 downward until the upper mold 2 and the lower mold 7 are tightly fitted, ready for the casting process.

[0050] Crucible 4 is connected to a pressurized pipe 5 and a pressure relief pipe 6 at each end to control the pressure inside the crucible 4. During the casting process, a gas (such as compressed air) at a certain pressure is introduced into the crucible 4 through the pressurized pipe 5, causing the molten metal in the crucible 4 to rise through the riser pipe 8 under pressure and enter the cavity formed by the lower mold 7 and the upper mold 2. When casting is complete, the pressure in the crucible 4 is released through the pressure relief pipe 6, allowing the molten metal to flow back into the crucible 4. This allows for precise control of the flow and filling of the molten metal, ensuring casting quality.

[0051] The secondary dehumidification net 21 can effectively absorb the moisture in the air entering from the pressurized pipe 5 again, reducing the possibility of pores in the molten metal caused by moisture in the subsequent casting process.

[0052] Reference Figure 4-Figure 7 A fixing ring 11 is provided at the bottom of the heating layer 10, a plurality of connecting rods 13 are provided at the bottom of the fixing ring 11, a plurality of elastic beads 14 are provided at the bottom of the connecting rods 13, and a plurality of limiting grooves are opened inside the crucible 4, and the plurality of connecting rods 13 and elastic beads 14 are matched with the corresponding limiting grooves respectively.

[0053] When installing the riser tube 8, forcefully align the connecting rod 13 and the elastic bead 14 with the retaining groove in the crucible 4 and insert them. Because the elastic bead 14 has a certain elastic deformation capacity, it will be squeezed and deformed during insertion. Once fully inserted, the elastic bead 14 returns to its original shape, forming an interference fit with the retaining groove. This fit ensures that the riser tube 8 can be securely fixed in a specific position on the crucible 4.

[0054] By providing the connecting rod 13 and the elastic beads 14 , the riser tube 8 is detachable and can be cleaned and maintained regularly to ensure the cleanliness of the interior of the riser tube 8 , and to facilitate cleaning when blockage occurs inside the riser tube 8 .

[0055] Reference Figure 5-Figure 7 A positioning groove is provided at the bottom of the lower mold 7, and a positioning ring 9 is provided on the top of the liquid rising tube 8. The positioning ring 9 is plugged into the positioning groove. A liquid inlet channel 15 is provided inside the lower mold 7, and the liquid inlet channel 15 is connected to the liquid rising tube 8.

[0056] When performing low-pressure casting of the front subframe, the riser tube 8 is first installed in the crucible 4. The positioning ring 9 on the top of the riser tube 8 is plugged into the positioning groove at the bottom of the lower mold 7 to play a precise positioning role. After the mold preparation work is completed, pressure is applied to the crucible 4 through the pressure tube 5, so that the molten metal in the crucible 4 rises through the riser tube 8 under the action of pressure.

[0057] Because the locating ring 9 at the top of the riser tube 8 engages the locating groove at the bottom of the lower mold 7, the connection between the riser tube 8 and the lower mold 7 is accurately positioned. After the molten metal flows out of the riser tube 8, it enters the cavity formed by the lower mold 7 and the upper mold 2 through the liquid inlet channel 15 connected to the lower mold 7. The plug-in fit between the locating ring 9 and the locating groove ensures that the molten metal flows accurately into the liquid inlet channel 15, avoiding leakage or inaccurate flow.

[0058] Working principle: First, the mold preparation stage is carried out. The riser tube 8 is installed in the crucible 4, and is firmly fixed by the connection rod 13 and elastic beads 14 at the bottom of the riser tube 8 and the limit groove in the crucible 4. This design makes the riser tube 8 detachable, which is convenient for regular cleaning and maintenance and avoids internal blockage. At the same time, the positioning ring 9 at the top of the riser tube 8 corresponds to the positioning groove at the bottom of the lower mold 7, preparing for subsequent precise connection. Then install the filter screen 17, and the block 18 at the top of the filter screen 17 is interference fit with the annular groove 16 at the bottom of the riser tube 8, which is convenient for replacement and cleaning in case of blockage or damage.

[0059] A cylinder 3 is provided between the two plates at the top of the mold body 1 to connect the upper mold 2. An electric push rod 12 between a plate and the mold body 1 can drive the plate to rise to separate the upper mold 2 from the lower mold 7, providing space for installation. After installing the lower mold 7, ensure that its internal liquid inlet channel 15 is connected to the liquid rising pipe 8.

[0060] When entering the casting process, molten metal is first added from the feed port of the crucible 4. After the addition is completed, the feed port is closed. At this time, the vacuum pump 19 on one side of the crucible 4 starts to work. The vacuum pump 19 extracts gas from the crucible 4 through the connecting pipe 20. The extracted gas can reduce the air humidity and impurity content in the crucible 4, and avoid excessive gas mixing into the molten metal during the molten metal filling process, which affects the quality of the casting. Then, when the mold starts to work, the resistance heating wire inside the heating layer 10 is energized to generate heat. The heating layer 10 installed on the top of the riser tube 8 keeps the top temperature above the solidification point of the molten metal to prevent the molten metal from solidifying and blocking the riser tube 8. The pressure tube 5 and the pressure relief tube 6 at both ends of the crucible 4 are used to control the internal pressure. During casting, the pressure tube 5 introduces gas into the crucible 4, so that the molten metal rises through the riser tube 8 under the action of pressure. The filter screen 17 at the bottom of the riser tube 8 filters the impurities inside the molten metal. After the molten metal flows out of the riser tube 8, it enters the cavity formed by the upper mold 2 and the lower mold 7 through the liquid inlet channel 15 inside the lower mold 7. The connection between the positioning ring 9 at the top of the riser tube 8 and the positioning groove at the bottom of the lower mold 7 ensures that the connection position is accurate, ensuring that the molten metal accurately flows into the liquid inlet channel 15, avoiding leakage and inaccurate flow direction.

[0061] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. Low-pressure casting mold for the front subframe, characterized by: include: A mold body (1), wherein a crucible (4) is provided at the bottom of the mold body (1), a liquid riser (8) is provided inside the crucible (4), the inner diameter of the crucible (4) gradually increases from top to bottom, a connecting pipe (20) is provided at the top of the crucible (4), an air pump (19) is provided on one side of the crucible (4), and an air outlet pipe is provided at one end of the air pump (19); An anti-blocking component is provided inside the rising pipe (8).

2. The low-pressure casting mold for the front subframe according to claim 1, characterized in that: The anti-clogging component comprises a heating component and a filtering component. The heating component is used to heat and insulate the top end of the riser pipe (8), and comprises a heating layer (10). The heating layer (10) is sleeved on the top end of the riser pipe (8), and a resistance heating wire is provided inside the heating layer (10); The filter component is used to filter impurities in the molten metal, and comprises a filter screen (17). The filter screen (17) is located at the bottom of the riser pipe (8), and the riser pipe (8) and the filter screen (17) are detachably connected. An annular groove (16) is provided at the bottom end of the liquid rising pipe (8), and a clamping block (18) is provided at the top of the filter screen (17).

3. The low-pressure casting mold for the front subframe according to claim 2, characterized in that: The clamping block (18) is interference-locked with the annular groove (16).

4. The low-pressure casting mold for the front subframe according to claim 1, characterized in that: Two plates are provided on the top of the mold body (1), a cylinder (3) is provided between the two plates, a plurality of electric push rods (12) are provided between one of the plates and the mold body (1), a pressurizing pipe (5) and a pressure relief pipe (6) are respectively connected at both ends of the crucible (4), and a secondary dehumidification net (21) is provided inside the pressurizing pipe (5).

5. The low-pressure casting mold for the front subframe according to claim 4, characterized in that: The bottom of the cylinder (3) is connected to an upper mold (2), and a lower mold (7) is provided inside the mold body (1).

6. The low-pressure casting mold for the front subframe according to claim 2, characterized in that: A fixing ring (11) is provided at the bottom of the heating layer (10), a plurality of connecting rods (13) are provided at the bottom of the fixing ring (11), and a plurality of elastic beads (14) are provided at the bottom of the connecting rods (13).

7. The low-pressure casting mold for the front subframe according to claim 6, characterized in that: A plurality of limiting grooves are provided inside the crucible (4), and a plurality of connecting rods (13) and elastic beads (14) are matched with corresponding limiting grooves respectively.

8. The low-pressure casting mold for the front subframe according to claim 5, characterized in that: A positioning groove is provided at the bottom of the lower mold (7), a positioning ring (9) is provided at the top of the liquid rising pipe (8), and the positioning ring (9) is plugged into the positioning groove. A liquid inlet channel (15) is provided inside the lower mold (7), and the liquid inlet channel (15) is connected to the liquid rising pipe (8).

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