A lost foam mold for a gearbox that is easy to drain

Abstract

The present invention provides a gearbox lost foam mold that is easy to drain, comprising: a mold body, the mold body comprising an upper mold body and a lower mold body that can be sealed and covered; the lower mold body comprising a bottom plate, and a lower mold core is arranged above the bottom plate; the cavity formed between the lower mold core, the upper mold core, the upper mold body and the lower mold body after the mold body is covered is a gearbox lost foam mold cavity; the parting surface after the upper mold body and the lower mold body are covered is an inclined surface; a sealing plate, the sealing plate comprising an upper mold sealing plate and a lower mold sealing plate; a feeding mechanism, the feeding mechanism is used to feed materials into the mold body; an auxiliary molding mechanism, used for molding the gearbox lost foam; an ejection mechanism, used for ejecting and demolding the product. The parting surface formed by the upper mold body and the lower mold body of the mold is set as an inclined surface, which can drain the water after water cooling; a temperature detection device is provided to reasonably adjust the water intake, increase the service life of the mold, improve the production efficiency, and reduce the cost.

Description

Technical Field

[0001] The invention belongs to the technical field of lost foam molds, and in particular relates to a gearbox lost foam mold which is convenient for drainage. Background Art

[0002] With the development of economy and society, the popularity of automobiles is getting higher and higher, and the use of automobile gearboxes is also increasing. Automobile gearboxes are a device used to change the transmission ratio and expand the range of change of driving wheel torque and speed. Automobile gearbox housing is a key component of automobile gearbox. The housing of automobile gearbox is a relatively complex casting, which is generally manufactured by lost foam casting. The lost foam casting method currently used for automobile gearbox housing casting usually uses a mold that combines the upper and lower molds to form a lost foam cavity, and then produces the lost foam mold of the gearbox housing.

[0003] At present, the commonly used lost foam molding molds usually have a horizontal parting surface at the contact and sealing point between the upper mold and the lower mold, and the water outlet is arranged on the side wall of the mold. However, the drainage of the mold cavity is not thorough enough, and high-temperature water still remains in the inner cavity. The mold temperature is high. Long-term water storage will have a certain impact on the service life of the mold, causing local corrosion and defects of the mold.

[0004] Therefore, it is necessary to provide an improved technical solution to address the above-mentioned deficiencies in the prior art. Summary of the invention

[0005] The purpose of the present invention is to provide a gearbox lost foam mold that is easy to drain, so as to solve the problem that the existing lost foam mold cavity is not completely drained, high-temperature water will remain, and the mold life will be affected.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A gearbox lost foam mold that is easy to drain, the gearbox lost foam mold comprising: a mold body, the mold body comprising an upper mold body and a lower mold body, the upper mold body is a square box body, and the upper mold body and the lower mold body can be sealed and covered; an upper mold core is arranged at the center of the inner wall of the upper mold body, and the cavity between the upper mold body and the upper mold core is the upper mold cavity; the lower mold body comprises a bottom plate, a lower mold core is arranged above the bottom plate, and the cavity between the lower mold body and the lower mold core is the lower mold cavity; the cavity formed between the lower mold core, the upper mold core, the upper mold body and the lower mold body after the mold bodies are covered is the gearbox lost mold cavity; the parting surface after the upper mold body and the lower mold body are covered is an inclined surface; a sealing plate, the sealing plate comprises an upper mold sealing plate and a lower mold sealing plate, and the upper mold sealing plate is arranged on the top of the upper mold body , used to seal the upper mold body; the lower mold plate is arranged at the bottom of the lower mold body, used to seal the lower mold body; a feeding mechanism, the feeding mechanism includes a first material gun, the first material gun passes through the upper mold sealing plate into the lost mold cavity, and the feeding mechanism is used to feed material into the mold body; an auxiliary molding mechanism, the auxiliary molding mechanism includes a water inlet and drainage mechanism and an air inlet and exhaust mechanism, the water inlet and drainage mechanism is arranged on the wall surface of the upper mold body and the lower mold body, and is used to cool the mold body; the air inlet and exhaust mechanism is arranged on the wall surface of the upper mold body and the lower mold body, and is used to heat and maintain the mold body, as well as exhaust when feeding, and the auxiliary molding mechanism is used for the molding of the gearbox lost mold; an ejection mechanism, the ejection mechanism is arranged at the lower part of the lower mold body, and is used to eject and demold the product.

[0008] In the gearbox lost foam mold for facilitating drainage as described above, preferably, the inclined surface is inclined at an angle of 3-5° to the horizontal direction.

[0009] In the gearbox lost foam mold for facilitating drainage as described above, preferably, there is a height difference between the two sides of the upper mold body or the lower mold body wall perpendicular to the plane where the inclined surface is located, and the height difference is 1-3 cm.

[0010] In the gearbox lost foam mold that is easy to drain as described above, preferably, the water inlet and drainage mechanism includes a first water inlet symmetrically arranged on the two side walls of the upper mold body, and a second water inlet symmetrically arranged on the two side walls of the lower mold body, the first water inlet and the second water inlet are respectively connected to the upper mold cavity and the lower mold cavity; a drainage portion protruding from the upper mold body is provided on the side wall surface of the upper mold body that contacts the lower part of the inclined surface, and a groove portion is provided at a corresponding position on the lower mold body, the drainage portion is embedded in the groove portion, and a drainage elbow is installed in the drainage portion for diverting sewage; a drainage port is also provided on the lower mold body or on the lower mold sealing plate; water entering the upper mold cavity is discharged from the drainage elbow, and water entering the lower mold cavity is discharged from the drainage port.

[0011] In the gearbox lost foam mold that is easy to drain as described above, preferably, the air intake and exhaust mechanism includes a first air inlet symmetrically arranged on both side walls of the upper mold body, and a second air inlet symmetrically arranged on both side walls of the lower mold body; the first air inlet and the second air inlet are respectively connected to the upper mold cavity and the lower mold cavity; the top of the upper mold body and the side wall of the lower mold body are both provided with vent valves, and the vent valves are used for exhausting air during feeding.

[0012] In the gearbox lost foam mold that is easy to drain as described above, preferably, the feeding mechanism also includes a second material gun penetrated on the side wall, and the second material gun passes through the side wall of the upper mold body into the lost foam mold cavity; the first material gun and the second material gun are both automatically controlled feeding guns.

[0013] In the gearbox lost foam mold that is easy to drain as described above, preferably, positioning features are provided around the bottom of the upper mold body and on the upper surface of the bottom plate of the lower mold body for positioning when the mold is closed; positioning holes are provided around the bottom of the upper mold body, and positioning columns are provided around the upper surface of the bottom plate of the lower mold body, and the positioning holes and the positioning columns are snap-fitted.

[0014] In the gearbox lost foam mold that is easy to drain as described above, preferably, the ejection mechanism includes a cylinder, a top plate and a push rod, the cylinder passes through the lower mold sealing plate and is connected to the top plate located between the lower mold sealing plate and the bottom plate, the top plate is connected with a push rod, the push rod passes through the gap in the bottom plate and the lower mold core and contacts the product, the cylinder drives the top plate and the push rod to move together, pushes the product to move upward, and demolds; the cylinder is an electromagnetically controlled cylinder.

[0015] In the gearbox lost foam mold that is easy to drain as described above, preferably, a temperature detection device is provided on the side wall of the upper mold body, and the temperature sensing probe of the temperature detection device extends into the upper mold cavity.

[0016] In the gearbox lost foam mold that is easy to drain as described above, preferably, a side core-pulling cylinder is also provided on the side wall of the upper mold body.

[0017] The technical solution provided by the present invention has the following excellent effects:

[0018] The gearbox lost foam mold for easy drainage of the present invention has a contact parting surface between an upper mold body and a lower mold body configured as an inclined surface, which can control the flow direction of cooling water in the upper mold cavity and drain high-temperature water after water cooling; and is provided with a temperature detection device, which reasonably adjusts the water intake according to the temperature of the mold, thereby increasing the service life of the mold, improving the efficiency of manufacturing the lost foam, and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. Among them:

[0020] Figure 1 A three-dimensional diagram of a lost foam mold for a gearbox according to an embodiment of the present invention;

[0021] Figure 2 A side view of a lost foam mold for a gearbox according to an embodiment of the present invention;

[0022] Figure 3 Schematic diagram of the bottom structure of the mold according to an embodiment of the present invention (the lower mold sealing plate is omitted);

[0023] Figure 4 for Figure 1 Schematic diagram of the internal structure of the upper mold body;

[0024] Figure 5 for Figure 1 The schematic diagram of the structure of the mold after removing the upper mold body and the vent valve;

[0025] Figure 6 for Figure 1 Schematic diagram of the lower mold structure (including drainage elbow);

[0026] Figure 7 for Figure 1 Schematic diagram of the back structure of the lower mold body;

[0027] Figure 8 This is a schematic diagram of the lost foam structure of a gearbox prepared according to an embodiment of the present invention.

[0028] In the figure: 1. upper mold body; 11. upper mold core; 2. lower mold body; 21. bottom plate; 22. lower mold core; 3. inclined surface; 4. upper mold sealing plate; 5. lower mold sealing plate; 6. first material gun; 7. second material gun; 81. first water inlet; 82. second water inlet; 83. first air inlet; 84. second air inlet; 85. drainage part; 86. groove part; 87. drainage elbow; 88. vent valve; 91. electromagnetic control cylinder; 92. top plate; 93. ejector rod; 10. temperature detection device; 11. side core-pulling cylinder; 12. positioning hole; 13. positioning column; 14. sealing groove; 15. cylinder protection frame; 16. gearbox lost foam. DETAILED DESCRIPTION

[0029] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0030] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0031] like Figures 1 to 8 As shown, according to an embodiment of the present invention, a gearbox lost foam mold that is easy to drain is provided, and the gearbox lost foam mold comprises:

[0032] The mold body comprises an upper mold body 1 and a lower mold body 2, the upper mold body 1 is a square box body, and the upper mold body 1 and the lower mold body 2 can be sealed and covered; an upper mold core 11 is arranged at the center of the inner wall of the upper mold body 1, and the cavity between the upper mold body 1 and the upper mold core 11 is the upper mold cavity; the lower mold body 2 comprises a bottom plate 21, a lower mold core 22 is arranged above the bottom plate 21, and the cavity between the lower mold body 2 and the lower mold core 22 is the lower mold cavity; the cavity formed between the lower mold core 22, the upper mold core 11, the upper mold body 1 and the lower mold body 2 after the mold bodies are covered is the gearbox lost mold 16 cavity, and the lost mold cavity is used to form the gearbox lost mold 16; the parting surface after the upper mold body 1 and the lower mold body 2 are covered is the inclined surface 3.

[0033] In a specific embodiment of the present invention, there is a height difference of 1-3 cm (eg, 1 cm, 1.5 cm, 2 cm, 2.5 cm) on both sides of the wall of the upper mold body 1 or the lower mold body 2 perpendicular to the plane where the inclined surface 3 is located.

[0034] In a specific embodiment of the present invention, the inclined surface 3 is inclined at an angle of 3-5° (e.g., 3.2°, 3.5°, 3.8°, 4°, 4.2°, 4.5°, 4.8°) to the horizontal direction. Preferably, it is 5°. And because the size of the mold is relatively large, when the inclined surface 3 is inclined at an angle of 5° to the horizontal direction, the height difference on both sides of the mold body caused by the inclined surface 3 is 2 cm.

[0035] The sealing plate includes an upper mold sealing plate 4 and a lower mold sealing plate 5. The upper mold sealing plate 4 is arranged on the top of the upper mold body 1 to seal the upper mold body 1; the lower mold is arranged on the bottom of the lower mold body 2 to seal the lower mold body 2.

[0036] In a specific embodiment of the present invention, an annular sealing groove 14 is circumferentially provided on the upper surface of the bottom plate 21 of the lower mold body 2. When the mold is closed, a sealing gasket is provided on the sealing groove 14 of the lower mold body 2 to form a seal for the mold.

[0037] The feeding mechanism includes a first material gun 6, which passes through the upper mold sealing plate 4 and enters the lost mold cavity. The feeding mechanism is used to feed materials into the mold body and pass the lost mold molding raw material beads. The first material gun 6 and the upper mold sealing plate 4 are sealed.

[0038] In a specific embodiment of the present invention, the feeding mechanism also includes a second material gun 7 penetrated on the side wall, the second material gun 7 passes through the side wall of the upper mold body 1 and enters the disappearing mold cavity, and the second material gun 7 is sealed at the connection with the upper mold; preferably, the first material gun 6 and the second material gun 7 are both automatically controlled feeding guns, and automatic filling is achieved by pneumatics.

[0039] Auxiliary molding mechanism, the auxiliary molding mechanism includes a water inlet and drainage mechanism and an air inlet and exhaust mechanism. The water inlet and drainage mechanism is arranged on the wall surface of the upper mold body 1 and the lower mold body 2, and is used to pass cooling water into the mold body to cool the mold; the air inlet and exhaust mechanism is arranged on the wall surface of the upper mold body 1 and the lower mold body 2, and is used to pass hot steam to heat and maintain the pressure of the mold body. The auxiliary molding mechanism is used for the molding of the gearbox lost mold 16.

[0040] In a specific embodiment of the present invention, the water inlet and drainage mechanism includes a first water inlet 81 symmetrically arranged on the two side walls of the upper mold body 1, and a second water inlet 82 symmetrically arranged on the two side walls of the lower mold body 2, the first water inlet 81 and the second water inlet 82 are respectively connected to the upper mold cavity and the lower mold cavity; a drainage portion 85 protruding from the upper mold body 1 is arranged on the side wall surface of the upper mold body 1 that contacts the lower part of the inclined surface 3, and a groove portion 86 is arranged at a corresponding position on the lower mold body 2. After the mold is closed, the drainage portion 85 is embedded in the groove portion 86, and a drainage elbow 87 is installed in the drainage portion 85. One end opening of the drainage elbow 87 is arranged in the upper mold cavity and is sealed and connected to the upper mold body 1. The other end of the drainage elbow 87 extends through a sewage hole arranged on the outer wall of the drainage portion 85. The drainage portion 85 is a hollow cavity for placing the drainage elbow 87 and diverting the high-temperature sewage after cooling the mold. A drain outlet is also provided on the lower mold body 2 or the lower mold sealing plate 5. The sewage in the lower mold body 2 can be discharged from the second air inlet 84 of the lower mold body 2 or discharged through a drain outlet provided on the lower mold sealing plate 5; the water entering the upper mold cavity is discharged from the drain elbow 87, and the water entering the lower mold cavity is discharged from the drain outlet.

[0041] In a specific embodiment of the present invention, the air intake and exhaust mechanism includes a first air inlet 83 symmetrically arranged on the two side walls of the upper mold body 1, and a second air inlet 84 symmetrically arranged on the two side walls of the lower mold body 2; the first air inlet 83 and the second air inlet 84 are respectively connected to the upper mold cavity and the lower mold cavity; the top of the upper mold body 1 and the side wall of the lower mold body 2 are both provided with a vent valve 88, and the vent valve 88 is used to exhaust when the raw material is fed to ensure that the air pressure inside and outside the mold cavity is the same.

[0042] In a specific embodiment of the present invention, the vent valve 88 passes through the upper mold sealing plate 4 and is connected to the vanishing model cavity, and the vent valve 88 is sealed at the connection with the upper mold template; a vent valve 88 is also provided on the side wall of the lower mold body 2 (not shown in the figure), and the vent valve 88 passes through the side wall of the lower mold body 2 and is connected to the vanishing model cavity.

[0043] In a specific embodiment of the present invention, the first water inlet 81 and the first air inlet 83 are arranged in parallel, and the two can be used interchangeably according to the actual space conditions on site to pass water or steam into the upper mold cavity. The second water inlet 82 and the second air inlet 84 are also arranged in parallel, and can be used interchangeably according to the actual conditions to pass water or steam into the lower mold cavity.

[0044] In a specific embodiment of the present invention, a temperature detection device 10 is provided on the side wall of the upper mold body 1, and a temperature sensing probe of the temperature detection device 10 extends into the upper mold cavity. The temperature detection device 10 is an automatic temperature measuring device electrically connected to an external digital display device. When steam is introduced, the temperature sensing probe can test the steam temperature in the mold cavity; when cooling water is introduced for cooling, the temperature sensing probe can test the internal water temperature. After the cooling water is discharged, the temperature sensing probe can test the mold temperature at this time. By providing the temperature detection device 10, the internal temperature of the mold can be immediately understood, and the gearbox molding process can be controlled in time.

[0045] The ejection mechanism is arranged at the lower part of the lower mold body 2 and is used to eject and demould the product.

[0046] In a specific embodiment of the present invention, the ejection mechanism includes a cylinder, a top plate 92 and a push rod 93. The cylinder passes through the lower mold closing plate 5 and is connected to the top plate 92 located between the lower mold closing plate 5 and the bottom plate 21. The top plate 92 is connected to the push rod 93. The push rod 93 passes through the gap of the bottom plate 21 and the lower mold core 22 to contact the product. The top plate 92 is fixedly connected to the push rod 93. The cylinder pushes the top plate 92 and the push rod 93 to move upward together through the telescopic rod to eject the product and complete the demolding operation.

[0047] Preferably, the cylinder is an electromagnetically controlled cylinder 91 , and there are multiple electromagnetically controlled cylinders 91 . A cylinder protection frame 15 is provided outside the electromagnetically controlled cylinder 91 , and the cylinder protection frame 15 is connected and fixed to the lower mold sealing plate 5 .

[0048] In a specific embodiment of the present invention, positioning features are provided around the bottom of the upper mold body 1 and on the upper surface of the bottom plate 21 of the lower mold body 2 for positioning when the mold is closed; preferably, positioning holes 12 are provided around the bottom of the upper mold body 1, and positioning columns 13 are provided around the upper surface of the bottom plate 21 of the lower mold body 2. The positioning holes 12 and the positioning columns 13 are snap-fitted together, so that they can quickly position and complete the sealing process when the mold is closed.

[0049] In a specific embodiment of the present invention, a side core pulling cylinder 11 is further provided on the side wall of the upper mold body 1. Preferably, the side core pulling cylinder 11 is a reverse core pulling cylinder, which is applied to a larger mold in the present invention to make the core pulling force more uniform, improve the stability of the core pulling, and protect the structural integrity of the lost foam.

[0050] In the embodiments of the present invention, expandable polystyrene resin beads (i.e. EPS beads) are used to illustrate the working process of the device.

[0051] The specific working process of preparing the gearbox lost foam 16 using the gearbox lost foam 16 mold that is easy to drain of the present invention is as follows:

[0052] Step 1, install the mold on the hydraulic forming machine, fix the upper mold body 1 and the lower mold body 2 on the upper and lower pressure plates of the hydraulic forming machine respectively, and control the mold opening and closing processes of the upper mold body and the lower mold body 2 through the pressure plate of the hydraulic forming machine; connect the air pipe and the water pipe to the air inlet pipe and the water inlet pipe of the mold respectively; control the air intake and water inlet process and the mold opening and closing process by controlling the control panel of the hydraulic forming machine;

[0053] Step 2: Preheat the mold by passing hot steam to 40-60°C for better molding;

[0054] Step 3: After the preheating, the mold is in a mold-closing state, and EPS beads that have been pre-foamed and matured are introduced, and the EPS beads are filled into the disappearing model cavity of the mold, and heated to make the beads expand again, fill the gaps between the beads, and make the beads fuse with each other to form a smooth surface, i.e., the model; EPS beads are filled into the mold through the first material gun 6 and the second material gun 7 controlled by air pressure; hot steam is introduced into the mold cavity of the upper mold body 1 and the mold cavity of the lower mold body 2, and the mold is heated to 100-120°C, and the EPS foam beads are bonded and formed by heating and pressurizing;

[0055] Step 4: Before demolding, the lost foam must be cooled to below the softening temperature. The model can be demolded only after hardening and shaping. After decompression and water cooling, the mold temperature reaches 35-60℃. Turn off the cooling water and drain the cooling water completely.

[0056] Step 5: Control the side core-pulling cylinder 11 to withdraw, and then open the mold; control the ejection mechanism, and the electromagnetic control cylinder 91 ejects the product lost foam white mold, and takes out the gearbox lost foam 16.

[0057] In summary, the gearbox lost foam mold that is easy to drain of the present invention has a contact parting surface between the upper mold body and the lower mold body set as an inclined surface, which can control the flow direction of cooling water in the upper mold cavity, drain the high-temperature water after water cooling, and is provided with a temperature detection device. The water intake is reasonably adjusted according to the temperature of the mold, which can increase the service life of the mold, improve the efficiency of producing lost foam, and reduce costs.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, 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 gearbox lost foam mold that is easy to drain, characterized in that: The gearbox lost foam mold comprises: a mold body, the mold body comprises an upper mold body and a lower mold body which can be sealed and covered, the upper mold body is a square box body; an upper mold core is arranged at the center of the inner wall of the upper mold body, and the cavity between the upper mold body and the upper mold core is the upper mold cavity; the lower mold body comprises a bottom plate, a lower mold core is arranged above the bottom plate, and the cavity between the lower mold body and the lower mold core is the lower mold cavity; the cavity formed between the lower mold core, the upper mold core, the upper mold body and the lower mold body after the mold body is covered is the gearbox lost foam mold cavity; the parting surface after the upper mold body and the lower mold body are covered is an inclined surface; a sealing plate, the sealing plate comprises an upper mold sealing plate and a lower mold sealing plate, and the upper mold sealing plate is arranged The top of the upper mold body is used to seal the upper mold body; the lower mold sealing plate is arranged on the bottom of the lower mold body, and is used to seal the lower mold body; a feeding mechanism, the feeding mechanism includes a first material gun, the first material gun passes through the upper mold sealing plate into the disappearing mold cavity, and the feeding mechanism is used to feed material into the mold body; an auxiliary molding mechanism, the auxiliary molding mechanism includes a water inlet and drainage mechanism and an air inlet and exhaust mechanism, the water inlet and drainage mechanism is arranged on the wall surface of the upper mold body and the lower mold body, and is used to cool the mold body; the air inlet and exhaust mechanism is arranged on the wall surface of the upper mold body and the lower mold body, and is used to heat and maintain the pressure of the mold body, and to exhaust when feeding, and the auxiliary molding mechanism is used The molding of the lost mold of the gearbox; the ejection mechanism, which is arranged at the lower part of the lower mold body and is used to eject the product from the mold; the inclined surface is inclined at an angle of 3-5° to the horizontal direction; the two sides of the wall surface of the upper mold body or the lower mold body perpendicular to the plane where the inclined surface is located have a height difference, and the height difference is 1-3cm; the water inlet and drainage mechanism includes a first water inlet symmetrically arranged on the two side walls of the upper mold body, and a second water inlet symmetrically arranged on the two side walls of the lower mold body, the first water inlet and the second water inlet are respectively connected to the upper mold cavity and the lower mold cavity; a drainage portion protruding from the upper mold body is arranged on the side wall surface of the upper mold body that contacts the lower part of the inclined surface, and the lower mold body is provided with a drainage portion protruding from the upper mold body. A groove portion is provided at a corresponding position on the mold body, and the drainage portion is embedded in the groove portion. A drainage elbow is installed in the drainage portion to divert sewage; a drainage port is also provided on the lower mold body or the lower mold sealing plate; water entering the upper mold cavity is discharged from the drainage elbow, and water entering the lower mold cavity is discharged from the drainage port; the air intake and exhaust mechanism includes a first air inlet symmetrically arranged on both side walls of the upper mold body, and a second air inlet symmetrically arranged on both side walls of the lower mold body; the first air inlet and the second air inlet are respectively connected to the upper mold cavity and the lower mold cavity; the top of the upper mold body and the side wall of the lower mold body are provided with a vent valve, and the vent valve is used for exhausting during feeding.

2. The gearbox lost foam mold for facilitating drainage as claimed in claim 1, characterized in that: The feeding mechanism also includes a second material gun, which passes through the side wall of the upper mold body and enters the lost mold cavity; the first material gun and the second material gun are both automatically controlled feeding guns.

3. The gearbox lost foam mold for facilitating drainage as claimed in claim 1, characterized in that: Positioning holes are arranged around the bottom of the upper mold body, and positioning posts are arranged around the upper surface of the bottom plate of the lower mold body, and the positioning holes and the positioning posts are snap-fitted.

4. The gearbox lost foam mold for facilitating drainage as claimed in claim 1, characterized in that: The ejection mechanism includes a cylinder, a push plate and a push rod. The cylinder passes through the lower mold sealing plate and is connected to the top plate located between the lower mold sealing plate and the bottom plate. The top plate is connected with a push rod. The push rod contacts the product after passing through the gap of the bottom plate and the core of the lower mold. The cylinder drives the top plate and the push rod to push the product upward for demolding. The cylinder is an electromagnetically controlled cylinder.

5. The gearbox lost foam mold for facilitating drainage as claimed in claim 1, characterized in that: A temperature detection device is provided on the side wall of the upper mold body, and a temperature sensing probe of the temperature detection device extends into the mold cavity of the upper mold.

6. The gearbox lost foam mold for facilitating drainage as claimed in claim 1, characterized in that: A side core-pulling cylinder is also arranged on the side wall of the upper mold body.

Images