Die for low-pressure casting of integrated water-cooled motor shell

Abstract

A mold for low-pressure casting of an integrated water-cooled motor shell comprises a metal mold mechanism, a ceramic mold lining mechanism, a demolding device mechanism and a control mechanism. The breathable ceramic mold lining and the breathable mold core are manufactured by utilizing the characteristic that breathable high-purity silicon nitride is not adhered to aluminum, the corrosion-resistant deformation coefficient is low, the high-temperature-resistant heat conductivity coefficient can meet the filling requirement of low-pressure casting under the process control, and the exhaust property and the demolding property are good without coating; an inner cavity sand core and a water channel sand core in the prior art are replaced with the breathable ceramic mold core and the cooling pipe, the mold core can be repeatedly used, the links of core making and complex flow channel sand removing are omitted, and production is free of pollution. During mold filling, cooling air is filled from an inlet of the cooling pipe, so that mold filling molten aluminum is effectively prevented from corroding the cooling pipe, and the casting cooling mode of the low-pressure casting integrated water-cooling motor shell is changed from external cooling to direct cooling from the inside of a product; the cooling speed of the product is increased, the material density and the size precision of the product are improved, the productivity and the yield can be improved, and the requirement for black light production is met.

Description

Technical Field

[0001] The present application relates to the field of light alloy casting, and in particular to a mold for low-pressure casting of an integrated water-cooled motor housing. Background Art

[0002] In the field of light alloy casting, aluminum alloy casting, especially the water-cooled motor housing required by existing new energy vehicles, has a thick-walled complex structure. The quality of gravity casting cannot be guaranteed and the yield rate is also very low (including the use of high-density, high-purity silicon nitride breathable mold core). The use of metal mold low-pressure machine casting is the most commonly used method to ensure the quality of thick-walled complex parts. With the addition of shrinkage compensation parts, not only is the yield rate low, but the output is also low. In addition, the mold steel used is not only easily corroded by aluminum alloy liquid, but also deformed by heat, resulting in the unsealed mold seam and flashing of the product. In order to deal with the corrosion problem, the mold cavity must be sprayed with paint before casting, and it can only be operated manually. Uneven coating will not only affect the exhaust performance during liquid injection, but also affect the product quality. Sandblasting is required before spraying the paint. The process is not only dusty but also pollutes the production environment. It will also damage the mold, affecting the product precision and production capacity. In addition, the thick wall has a long solidification time and the production process is difficult to control. Due to the change of cooling time and insufficient solidification time, aluminum liquid reflux often occurs, resulting in empty shell products, which seriously affects energy consumption, cost and production capacity.

[0003] Application No. CN202311299310 is a water-cooled motor case and its assembly method, which has a complex structure and high manufacturing cost; however, the traditional motor case is only a carrier for the stator, rotor and windings. However, with the improvement of product performance and the increase in motor power, heat will continue to be generated. The motor case is not just a carrier, but will become a high-end water-cooled radiator. If the conventional manufacturing method is adopted, the following problems will exist: the water channel sand core is not easy to manufacture and the positioning is inaccurate when the motor case is cast. After the motor case is cast, the sand core in the water channel needs to be cleaned, which is time-consuming and laborious, and the cleaning is not thorough. After the water channel sand core is cleaned, it needs to be sealed and additional assembly is required.

[0004] Therefore, the market is in urgent need of a new type of water-cooled motor housing that is easy to assemble, has higher precision, and is more convenient to use;

[0005] Application No. 202223317890.8, a water-cooled motor housing, which is not integral, and the two end covers use sand core water channels, which are polluting.

[0006] Application No. 202220076065.4, a low-pressure casting riser structure for a water-cooled motor casing, low-pressure bottom pouring plus riser, has a very low yield, low efficiency, and pollution.

[0007] Application number CN202120497196.5, a new energy vehicle water-cooled motor casing extrusion die, extrusion intermediate, non-integrated, the two end covers use sand core water channels, which are polluting.

[0008] Application number CN202111148838.1, a mold for the water-cooled motor housing of a new energy vehicle, is split, uses a sand core waterway, and is polluting. Utility Model Content

[0009] In view of the above problems, the present application provides a low-pressure casting mold for an integrated water-cooled motor housing, which can cast an integral water-cooled motor housing at one time without pollution and with high efficiency.

[0010] According to the technical solution of the present application: a mold for low-pressure casting of an integrated water-cooled motor housing, characterized in that it includes a metal mold shell mechanism, a breathable ceramic mold lining mechanism, a demoulding device mechanism, and a control mechanism;

[0011] The metal mold shell mechanism includes an electric heating pipe groove arranged on the periphery of the cylindrical metal mold shell 1, a stainless steel electric heating pipe 3 is arranged in the electric heating pipe groove, a first electric heating pipe connection port 2 is arranged below the periphery of the metal mold shell 1, a second heating pipe connection port 26 is arranged on the periphery of the metal mold shell 1, a connecting wire 43 with a thermocouple is arranged in the electric heating pipe connection port, a cooling pipe outlet 24 is arranged above the second heating pipe connection port 26, an air vent 41 is arranged in the convex edge of the metal mold shell 1, a cooling pipe air inlet 27 of the lower positioning hole of the water cooling pipe is also arranged at the lower part of the metal mold shell 1, and a cooling pipe air inlet 27 is arranged on the upper side of the cooling pipe air inlet 27 There is a cooling demolding air inlet 44 communicated with the demolding top cover cavity 12; a concave demolding device cavity 4 is arranged under the metal mold shell 1, and three equally divided demolding spring device cavities are arranged in the demolding device cavity 4 for the demolding mechanism; a breathable ceramic mold lining mechanism is fixed in the inner cavity of the metal mold shell 1, a mold cover 8 is arranged on the metal mold shell 1, and a breathable mold core positioning port 14 for filling the inner cavity of the motor is arranged in the mold cover 8, a buffer sealing strip 7 is arranged between the metal mold shell 1 and the mold cover 8, a mold core airway port 40 is arranged on one side of the mold cover 8, and a solenoid valve 45 is arranged on the mold core airway port for controlling the exhaust during filling and the sealing pressurization after filling.

[0012] The breathable ceramic mold lining mechanism comprises an inverted trapezoidal motor head cavity 17 arranged at the lower center position of the breathable ceramic mold lining 9, a mesh platform is arranged under the inverted trapezoidal motor head cavity 17, and a disposable filter screen 18 is arranged on the mesh platform; an inverted trapezoidal filling cavity 19 is arranged at the lower port of the mesh platform, three equally divided demoulding top cover cavities 12 are arranged on the motor head end surface of the breathable ceramic mold lining 9, a demoulding top cover rod hole 42 is arranged at the lower center position of the demoulding top cover cavity 12, and a cooling demoulding air inlet is arranged on the outer side below the demoulding top cover cavity 12, and the cooling demoulding air inlet is communicated with the cooling demoulding air inlet 44; a one-way plug 20 is arranged in the inverted trapezoidal filling cavity 19, a filling port 21 is arranged at the lower end of the inverted trapezoidal filling cavity 19, and an electric heating sleeve 23 is arranged on the outer side of the filling port 21; a positioning hole 22 under the water cooling pipe is arranged in one side end surface of the inverted trapezoidal motor head cavity 17; the upper part of the breathable ceramic mold lining 9 is arranged There are three equally divided water-cooling tube positioning holes 11, and a cooling tube pressing ring 10 is arranged on the water-cooling tube positioning holes 11; the water-cooling tube positioning holes 11 are composed of a semicircular water-cooling tube positioning groove in the upper end face of the breathable ceramic mold liner 9 and a semicircular water-cooling tube positioning groove on the lower end face of the cooling tube pressing ring 10, and one of the water-cooling tube positioning holes 11 is communicated with the cooling tube outlet 24 at the upper part of the metal mold; a product cavity 36 is arranged in the breathable ceramic mold liner 9, and a breathable ceramic mold core 32 is arranged in the product cavity 36, and a water-cooling coil 31 with three positioning tubes 30 is arranged in the product cavity 36 of the breathable ceramic mold liner 9 and the breathable ceramic mold core 32, one of the positioning tubes is communicated with the water-cooling coil, and a water-cooling coil lower positioning tube 33 is arranged at the lower end of the water-cooling coil 31; a breathable core cavity 34 is arranged in the breathable ceramic mold core 32; a mold cover liner 46 is arranged below the mold cover 8 on the breathable ceramic mold liner 9;

[0013] The demoulding device mechanism includes a demoulding top cover rod hole 42 provided in the demoulding top cover cavity 12, and a breathable ceramic demoulding top cover 13 provided on the demoulding top cover cavity 12; a circular top mold plate 5 is provided in the concave demoulding device cavity 4, and a demoulding top cover rod 15 matching the demoulding top cover rod hole 42 is provided on the top mold plate 5, and a mold lining opening for an inverted motor head cavity is provided in the middle of the top mold plate 5; a top mold plate reset compression spring 16 is provided at the lower part of the demoulding top cover rod 15; and an air inlet duct communicating with a cooling demoulding air inlet 44 is provided on the outer side of the demoulding top cover cavity 12;

[0014] The control mechanism includes a core positioning expansion core remover 39 arranged in the core positioning port 14 of the mold cover 8; a shrinkage heating ring 29 is arranged in the cooling tube pressure ring 10, a shrinkage heating ring combustion temperature contact meter 25 is arranged on one side of the mold cover 8, an aluminum liquid filling temperature control contact meter 28 is arranged on one side of the inverted filling cavity 19 of the metal mold shell 1, a filling port electric heating sleeve 23 is sleeved on the outside of the filling port 21, and a one-way plug sealing inclined surface 37 is arranged in the middle of the one-way plug 20;

[0015] The breathable ceramic mold lining 9 is made of silicon nitride breathable ceramic mold lining made by placing high-purity silicon nitride particles in a metal mold cavity, using a modified water-cooled motor housing product as a mold core, pressing and molding, and then sintering;

[0016] The function of the one-way plug sealing inclined surface 37 is that after the aluminum liquid fills the cavity, the heating ring combustion temperature contact meter 25 reaches the set temperature, so that the low-pressure furnace stops filling, and the one-way plug falls under the action of gravity. The one-way plug sealing inclined surface 37 is sealed with the inclined surface of the inverted filling cavity 19 to prevent the aluminum liquid from flowing back. At the same time, the shrinkage heating ring encounters the aluminum liquid and burns to generate high temperature and high pressure, so that the shrinkage liquid reaching the top of the product cavity 36 is heated and pressurized, so that the heated aluminum liquid pressurizes and shrinks the lower product under high pressure to increase the density of the lower product. The one-way plug is made of high-purity silicon nitride material and does not stick to aluminum.

[0017] The present application makes full use of the property of breathable high-purity silicon nitride that does not stick to aluminum, and makes a breathable ceramic mold liner 9 and a breathable mold core 32, which are corrosion-resistant, have a low deformation coefficient and are resistant to high temperatures. The thermal conductivity can meet the filling requirements of low-pressure casting under process control, and no coating is required, and the exhaust and demolding properties are good. The breathable ceramic mold core 32 and the cooling tube 31 are used to replace the motor sand core and the waterway sand core of the existing process, and the breathable ceramic mold core can be reused, eliminating the sandblasting, sand cleaning and spraying steps of the existing process, and no pollutants are generated; and the cooling tube 31 does not need to be cleaned, eliminating the core making and complex flow channel sand cleaning steps, and the production is pollution-free; the cooling air is filled into the cooling tube inlet 27 during filling, which not only effectively prevents the aluminum liquid from corroding the cooling tube, but also changes the low-pressure casting integrated water-cooled motor housing casting cooling method from external cooling to direct cooling from the inside of the product, which not only speeds up the cooling speed of the product, but also improves the material density of the product, and can also improve the production capacity, so that the quality of the integrated water-cooled motor housing product is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 , is a structural schematic diagram of a mold for low-pressure casting of an integrated water-cooled motor housing in the present application.

[0019] Figure 2 , which is a structural schematic diagram of the mold of the present application in which a cooling pipe 31, a cooling pipe pressure ring 10, a shrinkage-compensating heating ring 29 are placed before casting, and a breathable ceramic core 32 is fixed by a core positioning expansion corer 39 in a mold cover 8.

[0020] Figure 3 , is a schematic diagram of the upward structural view of the cooling pipe 31 with two cooling pipe positioning pins 30, cooling pipe outlet pins 35, and a lower positioning pipe port 33 of the water cooling coil, combined with the positioning hole groove on the water cooling pipe in the cooling pipe positioning pressure ring 10 when used in the present application.

[0021] Figure 4 , Figure 5, is a schematic diagram of the cross-section and bottom-up structural view of the one-way plug 20 used in the mold of the present application. DETAILED DESCRIPTION

[0022] The specific implementation methods of this application are further described below in conjunction with the accompanying drawings.

[0023] In the figure, it includes a metal mold shell 1, a first electric heating pipe connection port 2, an electric heating pipe 3, a concave demoulding device cavity 4, a top mold plate 5, a positioning rod 6, a buffer sealing strip 7, a mold cover 8, a breathable ceramic mold liner 9, a cooling pipe pressure ring 10, a positioning hole 11 on a water cooling pipe, a demoulding top cover cavity 12, a breathable ceramic demoulding top cover 13, a breathable mold core positioning port 14 for a motor inner cavity, a demoulding top cover rod 15, a top mold plate reset spring 16, an inverted motor head cavity 17, a disposable filter 18, an inverted filling cavity 19, a one-way plug 20, a filling port 21, a positioning hole 22 under a water cooling pipe, a filling port electric heating sleeve 23, a cooling pipe outlet 24, Feed heating ring combustion temperature contact meter 25, second electric heating tube connection port 26, cooling tube air inlet 27, aluminum liquid filling temperature control contact meter 28, feed heating ring 29, water-cooled positioning tube 30, water-cooling coil 31, breathable ceramic core 32, water-cooling coil lower positioning tube port 33, breathable core cavity 34, cooling tube outlet foot 35, product cavity 36, one-way plug-shaped slope 37, core positioning expansion core remover 38, core positioning expansion core remover 39, core airway port 40, air vent 41, demoulding top cover rod hole 42, connecting wire with thermocouple 43, cooling demoulding air inlet 44, solenoid valve 45, mold cover lining 46, etc.

[0024] As shown in the figure, the present application is a mold for low-pressure casting of an integrated water-cooled motor housing.

[0025] According to the technical solution of the present application: a mold for low-pressure casting of an integrated water-cooled motor housing, characterized in that it includes a metal mold shell mechanism, a breathable ceramic mold lining mechanism, a demoulding device mechanism, and a control mechanism;

[0026] The metal mold shell mechanism includes a cylindrical metal mold shell 1, an electric heating pipe groove, a mold lining airway port 41, an electric heating pipe 3, an electric heating pipe connection port 2, a second electric heating pipe connection port 26, a concave demolding device cavity 4, a mold cover 8, a mold cover lining 46, a breathable mold core positioning port 14, a sealing strip 7, a mold core airway port 40, and a solenoid valve 45; the electric heating pipe groove ring is placed on the periphery of the cylindrical metal mold shell 1, the stainless steel electric heating pipe 3 ring is placed in the electric heating pipe groove, the first electric heating pipe connection port 2 is arranged under the periphery of the metal mold shell 1, the second heating pipe connection port 26 is arranged on the periphery of the metal mold shell 1, the connecting wire 43 with a thermocouple is arranged in the electric heating pipe connection port, the cooling pipe outlet 24 is arranged above the second heating pipe connection port 26, and the air vent 41 is arranged in the convex edge of the metal mold shell 1 , which is convenient for the breathable ceramic mold lining to be breathable, the cooling pipe air inlet 27 of the lower positioning hole of the water-cooling pipe is arranged at the lower part of the metal mold shell 1, and the cooling demolding air inlet 44 communicated with the demolding top cover cavity 12 is arranged at the lower part of the cooling pipe air inlet 27; the concave demolding device cavity 4 is arranged below the metal mold shell 1, and the three equally divided demolding spring device cavities are arranged in the demolding device cavity 4, which is used to reset the top demolding plate; the breathable ceramic mold lining mechanism is fixed in the inner cavity of the metal mold shell 1, the mold cover 8 is arranged on the metal mold shell 1, the core positioning port 14 is arranged in the mold cover 8, the buffer sealing strip 7 is arranged between the metal mold shell 1 and the mold cover 8, the core airway port 40 is arranged on one side of the mold cover 8, and the solenoid valve 45 is arranged on the core airway port 40, which is used to control the exhaust during filling and the sealing pressurization after filling.

[0027] The breathable ceramic mold lining mechanism comprises a breathable ceramic mold lining 9, a motor head cavity 17, a demoulding top cover cavity 12, a demoulding top cover rod hole 42, an inverted cone-shaped filling cavity 19, a mesh platform, a disposable filter 18, a ceramic one-way plug 20, a filling port 21, an electric heating sleeve 23, a lower positioning hole 22 of a water-cooling pipe, an upper positioning hole 11 of a water-cooling pipe, a semicircular water-cooling pipe positioning groove, a cooling pipe pressure ring 10, and a mold cover lining 46; the inverted cone-shaped motor head cavity 17 is arranged at the lower center position of the breathable ceramic mold lining 9, the mesh platform is arranged at the lower part of the inverted cone-shaped motor head cavity 17, the disposable filter 18 The mold filling cavity 19 is arranged on the lower port of the mold filling cavity 19, the three equally divided demoulding top cover cavities 12 are arranged on the motor head end surface of the breathable ceramic mold liner 9, the demoulding top cover rod hole 42 is arranged at the lower center position of the demoulding top cover cavity 12, and the cooling demoulding air inlet duct is arranged on the lower outer side of the demoulding top cover cavity 12, and communicates with the cooling demoulding air inlet 44; the one-way plug 20 is arranged in the inverted mold filling cavity 19, the filling port 21 is arranged at the lower end of the inverted mold filling cavity 19, and the electric heating sleeve 23 is placed on the outside of the filling port 21; the water cooling pipe is arranged at the lower The positioning hole 22 is arranged in one side end face of the inverted cone-shaped motor head cavity 17; the three equally divided water-cooling tube positioning holes 11 are arranged on the upper part of the breathable ceramic mold liner 9, and the cooling tube pressure ring 10 is arranged on the water-cooling tube positioning hole 11; the water-cooling tube positioning hole 11 is composed of a semicircular water-cooling tube positioning groove in the upper end face of the breathable ceramic mold liner 9 and a semicircular water-cooling tube positioning groove on the lower end face of the cooling tube pressure ring 10, and one of the water-cooling tube positioning holes 11 is connected to the cooling tube outlet 24 at the upper part of the metal mold; the product cavity 36 is arranged in the breathable ceramic mold liner 9, and the breathable ceramic mold core 32 It is arranged in the product cavity 36, and the upper end can be connected to the mold cover 8; the water-cooling coil 31 with three positioning tubes 30 is arranged in the product cavity 36 of the breathable ceramic mold liner 9 and the breathable ceramic mold core 32, and one of the positioning tubes is communicated with the water-cooling coil; the lower positioning tube 33 of the water-cooling coil is arranged at the lower end of the water-cooling coil 31, and is inserted into the lower positioning hole 22 of the water-cooling tube when in use, and is communicated with the cooling tube air inlet 27; the breathable mold core cavity 34 is arranged in the breathable ceramic mold core 32, which is convenient for the use of the mold core positioning expansion core remover 39; the mold cover liner 46 is arranged below the mold cover 8;

[0028] The demoulding device mechanism includes a demoulding top cover cavity 12, a breathable ceramic demoulding top cover 13, a circular top template 5, a positioning rod 6, a demoulding spring device cavity, and a top template reset spring 16; the breathable ceramic demoulding top cover 13 is arranged in the demoulding top cover cavity 12; the circular top template 5 is arranged in the concave demoulding device cavity 4, and a breathable ceramic lining circular opening for placing the inverted motor head cavity 17 is reserved in the center of the top template, and the lower end of the demoulding template positioning rod 6 is arranged in the top template 5. The upper end of the template positioning rod 6 is connected to the demoulding top cover cavity 12, and three equidistant ones are provided; the three demoulding top cover rods 15 connected to the top template 5 match the demoulding top cover rod holes 42, the top template reset compression spring 16 is provided at the lower part of the demoulding top cover rod 15, and the top end of the demoulding top cover rod 15 is connected to the breathable ceramic demoulding top cover 13; the middle part of the top template 5 is provided with a mold lining port for the inverted motor head cavity; the air inlet duct communicated with the cooling demoulding air inlet 44 is provided on the outside of the demoulding top cover cavity 12;

[0029] The control mechanism includes a mold cover 8, a mold core positioning port 14, a mold core positioning expansion corer 39, a shrinkage heating ring 29, a shrinkage heating ring combustion temperature contact meter 25, an aluminum liquid filling temperature control contact meter 28, a filling port electric heating sleeve 23, a one-way plug terraced inclined surface 37, and an electromagnetic valve; the mold core positioning expansion corer 39 is arranged at the center of the mold core positioning port 14, the shrinkage heating ring 29 is arranged in the cooling tube pressure ring 10 before filling, the shrinkage heating ring combustion temperature contact meter 25 is arranged on one side of the mold cover 8, the aluminum liquid filling temperature control contact meter contact is arranged on one side of the inverted terraced filling cavity 19 of the metal mold shell 1, the filling port electric heating sleeve 23 is placed outside the filling port 21, and the inverted terraced sealing inclined surface 37 of the one-way plug is in a sealed state when combined with the inclined surface of the inverted terraced filling cavity 19;

[0030] The function of the one-way plug sealing inclined surface 37 is that after the aluminum liquid fills the mold cavity, the heating ring combustion temperature contact meter 25 reaches the set temperature, so that the low-pressure furnace stops filling, and the one-way plug falls under the action of gravity. The one-way plug sealing inclined surface 37 is sealed with the inclined surface of the inverted filling cavity 19 to prevent the aluminum liquid from flowing back. At the same time, the shrinkage heating ring encounters the aluminum liquid and burns to generate high temperature and high pressure, so that the shrinkage liquid reaching the top of the product cavity 36 is heated and pressurized, so that the heated aluminum liquid pressurizes and shrinks the lower product under high pressure to increase the density of the lower product.

[0031] The stainless steel electric heating tube 3 in the groove of the cylindrical metal mold shell is provided with two sections, and the upper and lower temperatures of the mold are controlled respectively according to the data in the connecting wire 43 with the thermocouple;

[0032] The breathable ceramic mold lining 9 is made of silicon nitride breathable ceramic mold lining made by placing high-purity silicon nitride particles in a metal mold cavity, using a modified water-cooled motor housing product as a mold core, pressing and molding, and then sintering;

[0033] The one-way plug, mold cover liner 46, and filling port 21 are made of high-purity and high-density silicon nitride material and are not contaminated by aluminum;

[0034] The water cooling coil 31 is made of a metal tube with high corrosion resistance and thermal conductivity;

[0035] The present application makes full use of the characteristics of breathable high-purity silicon nitride that does not stick to aluminum to make a breathable ceramic mold liner 9 and a breathable mold core 32, which are corrosion-resistant, have a low deformation coefficient and high temperature resistance, and a thermal conductivity that can meet the filling requirements of low-pressure casting under process control, do not require coatings, have good exhaust properties, good demolding properties, and can be reused; the breathable ceramic mold core 32 and the cooling tube 31 are used to replace the casing cavity sand core and the waterway sand core used in the existing process, eliminating the core making process and the sand blasting, sand cleaning and spraying processes required by the existing process, saving labor and materials. No pollutants are generated; and the cooling pipe 31 can be used directly without cleaning; and cooling air can be filled into the cooling pipe inlet 27 during filling, which not only effectively prevents the aluminum liquid from corroding the cooling pipe, but also changes the cooling method of the low-pressure casting one-piece water-cooled motor housing from external cooling to direct cooling from the inside of the product, which not only speeds up the cooling speed of the product, but also improves the material density and dimensional accuracy of the product, and can also improve the production capacity and output rate, meeting the demand for black light generation; making the one-piece water-cooled motor housing product quality more upscale and pollution-free.

[0036] The shape, content and material selection of the mold for a low-pressure casting one-piece water-cooled motor casing described above are only used to illustrate the technical solution of the present application and are not intended to be limiting. Other modifications or equivalent substitutions made to the technical solution of the present application by ordinary technicians in this field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. A mold for low-pressure casting of an integrated water-cooled motor housing, characterized in that: It includes a metal mold shell mechanism, a breathable ceramic mold lining mechanism, a demoulding device mechanism, and a control mechanism; The metal mold shell mechanism includes an electric heating pipe groove arranged on the periphery of the cylindrical metal mold shell, a stainless steel electric heating pipe is arranged in the electric heating pipe groove, a first electric heating pipe connection port is arranged below the periphery of the metal mold shell, a second heating pipe connection port is arranged on the periphery of the metal mold shell, a connecting wire with a thermocouple is arranged in the electric heating pipe connection port, a cooling pipe outlet is arranged above the second heating pipe connection port, an air vent is arranged in the convex edge of the metal mold shell, a cooling pipe air inlet of a positioning hole under the water cooling pipe is also arranged at the lower part of the metal mold shell, and a cooling pipe air inlet is arranged on the upper side of the cooling pipe air inlet There is a cooling demoulding air inlet communicated with the demoulding top cover cavity; a concave demoulding device cavity is arranged below the metal mold shell, and three equally divided demoulding spring device cavities are arranged in the demoulding device cavity for the demoulding mechanism; a breathable ceramic mold lining mechanism is fixed in the inner cavity of the metal mold shell, a mold cover is arranged on the metal mold shell, and a breathable mold core positioning port for filling the inner cavity of the motor is arranged in the mold cover, a buffer sealing strip is arranged between the metal mold shell and the mold cover, and a mold core airway port is arranged on one side of the mold cover, and a solenoid valve is arranged on the mold core airway port to control the exhaust during filling and the sealing pressurization after filling; The breathable ceramic mold lining mechanism comprises an inverted trapezoidal motor head cavity provided at the lower center position of the breathable ceramic mold lining, a mesh platform provided under the inverted trapezoidal motor head cavity, and a disposable filter screen provided on the mesh platform; an inverted trapezoidal filling cavity is provided at the lower port of the mesh platform, three equally divided demoulding top cover cavities are provided on the motor head end surface of the breathable ceramic mold lining, a demoulding top cover rod hole is provided at the lower center position of the demoulding top cover cavity, a cooling demoulding air inlet is provided on the outer side below the demoulding top cover cavity, and the cooling demoulding air inlet is communicated with the cooling demoulding air inlet; a one-way plug is provided in the inverted trapezoidal filling cavity, a filling port is provided at the lower end of the inverted trapezoidal filling cavity, and an electric heating sleeve is provided on the outer side of the filling port; a positioning hole under the water cooling pipe is provided in one side end surface of the inverted trapezoidal motor head cavity; a positioning hole under the water cooling pipe is provided on the breathable ceramic mold lining The upper part is provided with three equally divided water-cooling tube positioning holes, and a cooling tube pressing ring is provided on the water-cooling tube positioning holes; the water-cooling tube positioning holes are composed of a semicircular water-cooling tube positioning groove in the upper end face of the breathable ceramic mold liner and a semicircular water-cooling tube positioning groove on the lower end face of the cooling tube pressing ring, and one of the water-cooling tube positioning holes is communicated with the cooling tube outlet at the upper part of the metal mold; a product cavity is provided in the breathable ceramic mold liner, a breathable ceramic mold core is provided in the product cavity, a water-cooling coil with three positioning tubes is provided in the product cavity of the breathable ceramic mold liner and the breathable ceramic mold core, one of the positioning tubes is communicated with the water-cooling coil, and a water-cooling coil lower positioning tube is provided at the lower end of the water-cooling coil; a breathable core cavity is provided in the breathable ceramic mold core; a mold cover liner is provided under the mold cover on the breathable ceramic mold liner; The demoulding device mechanism includes a demoulding top cover rod hole arranged in the demoulding top cover cavity, a breathable ceramic demoulding top cover arranged on the demoulding top cover cavity; a circular top mold plate is arranged in the concave demoulding device cavity, a demoulding top cover rod matching the demoulding top cover rod hole is arranged on the top mold plate, and a mold lining opening for an inverted motor head cavity is arranged in the middle of the top mold plate; a top mold plate reset compression spring is arranged at the lower part of the demoulding top cover rod; an air inlet communicated with a cooling demoulding air inlet is arranged on the outer side of the demoulding top cover cavity; The control mechanism includes a core positioning expansion core remover arranged in the core positioning port of the mold cover; a shrinkage-compensating heating ring is arranged in the cooling tube pressure ring, a shrinkage-compensating heating ring combustion temperature contact meter is arranged on one side of the mold cover, an aluminum liquid filling temperature control contact meter is arranged on one side of the inverted conical filling cavity of the metal mold shell, a filling port electric heating sleeve is arranged on the outside of the filling port, and a one-way plug sealing inclined surface is arranged in the middle of the one-way plug.

2. The mold for low-pressure casting of an integrated water-cooled motor housing according to claim 1 is characterized in that: The breathable ceramic mold lining is a silicon nitride breathable ceramic mold lining made by placing high-purity silicon nitride particles in a metal mold cavity, using a modified water-cooled motor housing product as a mold core, pressing and molding, and then sintering.

Images