Motor shell casting equipment with cooling water pipe and casting method of motor shell casting equipment

Abstract

The invention discloses motor shell casting equipment with a cooling water pipe and a casting method thereof.The motor shell casting equipment comprises a casting mold and a sand core, the sand core is arranged in the casting mold in the vertical direction, a casting mold cavity is formed between the casting mold and the sand core, and the sand core is removed after casting is completed and forms an inner cavity of a casting; the spiral pipe fitting is arranged on the outer side of the sand core in a sleeving mode in the vertical direction and located in the casting cavity, and the spiral pipe fitting is integrally cast in the casting and forms a cooling water pipe; and the supporting assembly is arranged in the casting cavity, the spiral pipe fitting is arranged on the supporting assembly, and the supporting assembly is used for fixing the spiral pipe fitting and restraining the screw pitch of any adjacent ring layers in the spiral pipe fitting.

Description

Technical Field

[0001] This application relates to the technical field of casting processes, and more particularly to a motor housing casting device with cooling water pipes and a casting method thereof. Background Art

[0002] Currently, for the forging of motor housings, it is necessary to simultaneously meet the requirements of lightweight, high strength, and efficient heat dissipation. The side walls of the motor housing usually integrate spiral or semi-spiral cooling water pipes, and the temperature control of the motor is achieved through the circulation of the internal cooling medium. However, the casting process of this structure faces many technical bottlenecks. During the forging process, when the molten metal is poured, since the forging process in the related art generally pre-sets the cooling water pipes outside the sand core, and only relies on the structure of the cooling water pipes themselves for support, the impact force of the high-temperature molten metal during pouring is likely to cause the spiral water pipes to deform, collapse, or have uneven pitches, resulting in the loss of stability of the geometric structure of the cooling water pipes. At the same time, the geometric deviation will cause uneven wall thickness of the water channels and reduce the sealing performance.

[0003] Therefore, how to ensure that the spiral cooling water pipes maintain an accurate spiral geometric shape and axial spacing during the filling process of high-temperature molten metal, so as to simultaneously achieve the integrity of the structure of the cooling water pipes, has become a technical problem that needs to be solved urgently. Summary of the Invention

[0004] The purpose of this application is to provide a motor housing casting device with cooling water pipes and a casting method thereof, so as to ensure that the cooling water pipes of the motor housing maintain an accurate spiral geometric shape during the filling process of high-temperature molten metal.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: A motor housing casting device with cooling water pipes is provided, including a casting mold and a sand core. The sand core is arranged inside the casting mold in the vertical direction. A casting cavity is formed between the casting mold and the sand core. The sand core is removed after casting to form the inner cavity of the casting. A spiral pipe fitting is sleeved outside the sand core in the vertical direction and is located in the casting cavity. The spiral pipe fitting is integrally cast in the casting to form a cooling water pipe. A support assembly is arranged in the casting cavity. The spiral pipe fitting is arranged on the support assembly. The support assembly is used to fix the spiral pipe fitting and restrict the pitch between any adjacent circles of the spiral pipe fitting.

[0006] Preferably, there are multiple groups of the support assembly distributed along the circumferential direction of the spiral pipe fitting. Each group of the support assembly includes a base and a support plate. The base is arranged on the casting mold. The support plate is detachably arranged on the base. Positioning grooves matching the number of circles of the spiral pipe fitting are formed on the support plate. The spiral pipe fitting is adapted to be clamped in the positioning grooves to achieve fixation and pitch restriction, and the support plate is integrally cast in the casting.

[0007] As another preference, the motor housing casting device further includes a spacer plate. The spacer plate is provided with limiting grooves matching the number of turns of the spiral pipe fittings. The spiral pipe fittings are adapted to be clamped in the limiting grooves to achieve pitch constraint.

[0008] Further preferably, a clamping groove is formed on the base, and a clamping protrusion is arranged on the support plate. The support plate is adapted to be clamped in the clamping groove through the clamping protrusion to achieve separable connection with the base; and the support plate is adapted to be installed on the base in the up-and-down direction.

[0009] Further preferably, the casting has a neck, and the base extends inwards to form a forming convex block. The forming convex block is adapted to cooperate with the casting mold to form the neck; the base is detachably arranged on the casting mold.

[0010] Further preferably, the motor housing has a shaft hole. The motor housing casting device further includes an exhaust pipe. The exhaust pipe is inserted into the sand core and extends upwards to the outside of the casting mold. The exhaust pipe passes through the casting to form a process hole, and the process hole is located in the shaft hole.

[0011] Preferably, the casting mold adopts a bottom gating structure. The casting mold includes an upper mold assembly and a lower mold assembly. The upper mold assembly is provided with a pouring gate, and the pouring gate is connected with a vertical sprue extending in the up-and-down direction. After the vertical sprue extends to the lower mold assembly, it is divided into a first horizontal sprue and a second horizontal sprue. The first horizontal sprue and the second horizontal sprue are respectively communicated with the two end inlets of the casting cavity; a buffer cavity is arranged between the transition of the vertical sprue to the first horizontal sprue and the second horizontal sprue, and a plurality of side riser cavities are arranged on the side part of the casting mold, and a top riser cavity is arranged on the top.

[0012] Preferably, this application document also provides a casting method for a motor housing with a cooling water pipe, including the following steps: S1: Prepare the casting mold, sand core, spiral pipe fittings, support assembly and exhaust pipe; the casting mold includes a lower mold assembly and an upper mold assembly; S2: Place the sand core at a predetermined position of the lower mold, and insert the exhaust pipe into the sand core; S3: Assemble the spiral pipe fittings and the support assembly, and place them at a predetermined position of the lower mold assembly; S4: Close the lower mold assembly and the upper mold assembly, and pour molten metal into the casting mold for pouring; S5: When the molten metal solidifies to 65% - 95%, pull out the exhaust pipe; S6: After the molten metal completely solidifies, the spiral pipe fittings are integrally cast in the casting to form a cooling water pipe, open the mold and take out the casting; S7: Process the casting to form a motor housing.

[0013] Further preferably, there are multiple sets of support components. Each set of support components includes a base and a support plate. The support plate is detachably arranged on the base. Positioning grooves matching the number of turns of the spiral pipe fitting are formed on the support plate, clamping grooves are formed on the base, and clamping protrusions are arranged on the support plate. The above step S3 further includes the following steps: S31: Align the positioning grooves of the support plate with the corresponding turns of the spiral pipe fitting for assembly, and place the base at a predetermined position of the lower mold assembly; S32: Align the clamping protrusions of the support plate with the clamping grooves of the base, and clamp the support plate together with the spiral pipe fitting onto the base from top to bottom; in the above step S6, the support plate is integrally cast in the casting, and the casting together with the base is taken out; and the base can be removed from the casting and reused.

[0014] Preferably, in the above step S1, the spiral pipe fitting needs to be preheated and shot peened.

[0015] Compared with the prior art, the beneficial effects of the present application are as follows: By directly controlling the pitch between any two adjacent layers of the spiral pipe fitting through the physical limit of the support component, during the casting stage, it is possible to prevent the spiral pipe fitting from collapsing or having uneven pitch under the impact of high-temperature molten metal, ensure the geometric accuracy of the cooling water pipe cast into the motor housing, and effectively prevent the deformation of the pipe body caused by the pouring impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of the motor housing.

[0017] Figure 2 It is a schematic structural diagram of the casting mold.

[0018] Figure 3 It is a schematic structural diagram of the motor housing casting equipment.

[0019] Figure 4 It is a schematic structural diagram of the motor housing casting equipment after the molten metal solidifies.

[0020] Figure 5 It is a side sectional view of the casting mold with a sand core placed inside.

[0021] Figure 6 It is a partial structural schematic diagram of the casting and the lower mold assembly.

[0022] Figure 7 It is an assembly structural schematic diagram of the spiral pipe fitting and the lower mold assembly.

[0023] Figure 8 It is an exploded structural schematic diagram of the spiral pipe fitting and the lower mold assembly.

[0024] Figure 9 It is an exploded structural schematic diagram of the spiral pipe fitting and the lower mold assembly from another perspective.

[0025] Figure 10 It is a structural schematic diagram of the lower die assembly.

[0026] Figure 11 It is a structural schematic diagram of the casting.

[0027] In the figure: 1. Motor housing casting equipment; 2. Casting; 3. Inner cavity; 4. Neck; 5. Motor housing; 6. Shaft hole; 10. Casting mold; 11. Upper die assembly; 111. Sprue; 112. Vertical sprue; 12. Lower die assembly; 121. First horizontal sprue; 122. Second horizontal sprue; 13. Buffer cavity; 20. Core; 21. Process hole; 30. Spiral pipe fitting; 40. Support assembly; 41. Base; 411. Clamping groove; 412. Forming convex block; 413. Base fixing groove; 42. Support plate; 421. Positioning groove; 422. Clamping protrusion; 50. Spacer plate; 60. Exhaust pipe; 70. Lubricating oil pipe; 81. Top riser cavity; 82. First side riser cavity; 83. Second side riser cavity; 84. Exhaust hole; 85. Top riser; 86. First side riser; 87. Second side riser. Specific embodiments

[0028] Next, in combination with specific embodiments, the present application will be further described. It should be noted that, on the premise of no conflict, the following-described embodiments or technical features can be arbitrarily combined to form new embodiments.

[0029] In the description of the present application, it should be noted that for orientation terms, such as terms "center", "horizontal", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the indicated orientation and position relationship are based on the orientation or position relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be construed as limiting the specific protection scope of the present application.

[0030] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence.

[0031] The terms "comprising" and "having" in the description and claims of this application, and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or apparatuses.

[0032] In a specific embodiment, referring to Figures 1 to 11 , this application document provides a motor housing casting device 1 with a cooling water pipe, including a casting mold 10 and a sand core 20. The sand core 20 is arranged inside the casting mold 10 in the up-and-down direction. A casting cavity 2 is formed between the casting mold 10 and the sand core 20. The sand core 20 is removed after casting to form an inner cavity 3 of the casting 2; a spiral pipe fitting 30, which is sleeved outside the sand core 20 in the up-and-down direction and is located in the casting cavity 2. The spiral pipe fitting 30 is integrally cast in the casting 2 to form a cooling water pipe. Specifically, referring to Figure 3 , Figure 7 and Figure 8 , the up-and-down direction in this application document is also the direction along the Z-axis of the coordinate axis; a support assembly 40, which is arranged in the casting cavity 2. The spiral pipe fitting 30 is arranged on the support assembly 40. The support assembly 40 is used to fix the spiral pipe fitting 30 and constrain the pitch of any adjacent turns in the spiral pipe fitting 30.

[0033] Among them, the motor housing casting device 1 in this application document is a sand casting device with an up-and-down cavity. The casting mold 10 adopts a bottom gating structure. The molten metal is poured from the bottom of the casting cavity 2 through the first runner 121 and the second runner 122, that is, the pouring direction fills from bottom to top. The molten metal rises smoothly in the casting cavity 2, which can effectively avoid the splashing and impact of the molten metal.

[0034] The casting mold 10 includes an upper mold assembly 11 and a lower mold assembly 12. The upper mold assembly 11 is provided with a pouring gate 111, and the pouring gate 111 is connected to a vertical runner 112 extending in the vertical direction. After the vertical runner 112 extends to the lower mold assembly 12, it is divided into a first horizontal runner 121 and a second horizontal runner 122. The first horizontal runner 121 and the second horizontal runner 122 are respectively connected to the injection ports at both ends of the cavity of the casting 2; a buffer cavity 13 is provided between the transition of the vertical runner 112 to the horizontal runners, and a plurality of side riser cavities are provided on the side of the casting mold 10. Preferably, in this application document, the side of the casting mold 10 is provided with a first side riser cavity 82 and a second side riser cavity 83. Exhaust holes 84 are provided on both the first side riser cavity 82 and the second side riser cavity 83 for exhaust, and a single top riser cavity 81 is provided at the top. Risers are formed by the solidification of the molten metal in the riser cavities. Specifically, the top riser cavity 81 forms a top riser 85, the first side riser cavity 82 forms a first side riser 86, and the second side riser cavity 83 forms a second side riser 87. The lower mold assembly 12 is also provided with exhaust holes 84 for exhaust.

[0035] Specifically, the runner inlet is connected to a vertical runner 112 extending perpendicularly along the direction of gravity. After the vertical runner 112 extends to the lower mold assembly 12, it is divided into a first horizontal runner 121 and a second horizontal runner 122. The first horizontal runner 121 and the second horizontal runner 122 are respectively connected to the axial two ends of the cavity of the casting 2. A sprue cup is provided at the runner inlet, and the vertical runner 112 extends vertically from the top of the upper mold assembly 11 to the lower mold assembly 12. And when the vertical runner 112 transitions to the first horizontal runner 121 and the second horizontal runner 122, a buffer cavity 13 is defined by surrounding between the upper mold assembly 11 and the lower mold assembly 12 to buffer the molten metal falling to the bottom from the vertical runner 112 to reduce the generation of bubbles in the molten metal entering the first horizontal runner 121 and the second horizontal runner 122.

[0036] Furthermore, two gates are provided on the first horizontal runner 121 at evenly spaced intervals; two gates are also provided on the second horizontal runner 122 at evenly spaced intervals; the four gates are respectively connected to the four axial quadrant regions of the cavity of the casting 2 to form a four-way synchronous pouring channel, further improving the pouring speed. At the same time, the synchronous pouring of the four gates makes the molten metal advance smoothly from four directions, greatly reducing the risk of gas entrainment and impurity retention.

[0037] It should be noted that the internal cavity of the motor housing 5 is formed by the sand core 20. The spiral pipe fitting 30 is coaxially sleeved outside the sand core 20 before pouring, that is, the spiral pipe fitting 30 is located in the cavity of the casting 2 before pouring, so that the spiral pipe fitting 30 is fused with the molten metal during pouring, realizing the integrated molding setting of the spiral pipe fitting 30 and the motor housing 5, ensuring that the spiral pipe fitting 30 evenly surrounds the inner cavity 3 of the motor housing 5 to maximize the heat exchange efficiency.

[0038] As an optimization, there are multiple groups of support components 40 distributed along the circumferential direction of the spiral pipe fitting 30. Each group of support components 40 includes a base 41 and a support plate 42. The base 41 is arranged on the casting mold 10, and the support plate 42 is detachably arranged on the base 41. Among them, multiple bases 41 are spaced apart along the spiral extension direction of the spiral pipe fitting 30, and the installation heights of multiple bases 41 are different from each other and increase step by step as the spiral pipe fitting 30 spirals upward. Specifically, multiple support components 40 are regularly arranged along with the spiral upward trend of the spiral pipe fitting 30 to cooperate with the support plate 42 to form a stepped support structure.

[0039] Specifically, the base 41 protrudes towards the cavity of the casting 2. The base 41 provides a stable fulcrum for the support plate 42. At the same time, multiple bases 41 correspond to and match multiple support plates 42. Multiple support plates 42 are spaced apart along the spiral extension direction of the spiral pipe fitting 30. Similarly, multiple bases 41 are regularly arranged in sequence. Refer to Figures 7 to 9 , multiple support components 40 can be defined by numbers. Taking the positive direction of the Y-axis towards the negative direction of the Y-axis as the reference, that is Figure 9 in [Figure], the first support component 40, the second support component 40, and the third support component 40 are distributed in sequence from right to left. The installation heights of the first support component 40 to the third support component 40 gradually increase, which is consistent with the spiral lifting direction of the spiral pipe fitting 30. Furthermore, through the first support component 40, the second support component 40, and the third support component 40, the axial climbing trajectory of the spiral pipe fitting 30 is matched to ensure that the radial binding force of the support plate 42 on each side to the spiral pipe fitting 30 is evenly distributed. And the interval between the first support component 40 and the second support component 40 is the same as the interval between the second support component 40 and the third support component 40. Furthermore, the circumferential direction of the spiral pipe fitting 30 is divided into multiple stress-bearing areas to reduce local stress concentration and significantly improve the impact resistance of the spiral pipe fitting 30.

[0040] Positioning grooves 421 matching the number of layers of the spiral pipe fitting 30 are provided on the support plate 42. The spiral pipe fitting 30 is adapted to be clamped in the positioning grooves 421 to achieve fixation and pitch constraint, and the support plate 42 is integrally cast in the casting 2.

[0041] Specifically refer to Figures 7 to 9 , the support plate 42 is a snap structure, and the spiral pipe fitting 30 has a spiral upward trend. Multiple spaced positioning grooves 421 are provided on the support plate 42. The positioning grooves 421 are arranged in a bayonet structure. Any two adjacent layers of the spiral pipe fitting 30 are clamped and fixed through the positioning grooves 421. Furthermore, the distance between adjacent turns of the spiral-shaped spiral pipe fitting 30 is directly controlled by physical limit, avoiding the collapse or uneven pitch of the spiral pipe fitting 30 with a spiral structure under the impact of high-temperature molten metal, and ensuring the geometric accuracy of the spiral pipe fitting 30 to prevent the water pipe from deforming due to pouring impact.

[0042] As another preference, refer to Figure 3 , the motor housing casting device 1 further includes a spacer plate 50. The spacer plate 50 is provided with a limiting groove that matches the number of turns of the spiral pipe fitting 30. The spiral pipe fitting 30 is adapted to be clamped in the limiting groove to achieve pitch constraint.

[0043] Among them, the spacer plate 50 is different from the support assembly 40. In this application document, multiple spacer plates 50 can also be provided, and they are arranged at intervals along the periphery of the spiral pipe fitting 30. The spacer plate 50 only provides a limit to the pitch of adjacent layers of the spiral pipe fitting 30, and the spacer plate 50 does not provide a supporting effect on the spiral pipe body. Therefore, through the setting of the thinner plate-like structure of the spacer plate 50, multiple spacer plates 50 for limiting the pitch can be arranged around the spiral pipe fitting 30 according to the actual working conditions.

[0044] Further preferably, a clamping groove 411 is formed on the base 41, and a clamping protrusion 422 is provided on the support plate 42. The support plate 42 is adapted to be clamped in the clamping groove 411 through the clamping protrusion 422 to realize a separable connection with the base 41; and the support plate 42 is adapted to be installed on the base 41 in the vertical direction. Through the clamping protrusion 422 and the clamping groove 411 on the base 41, mechanical locking is achieved to prevent the support plate 42 from shifting due to vibration during the casting process. And through the plug-in method, it is convenient to fix the spiral pipe fitting 30 into the cavity of the casting 2 before casting, and the single-piece efficiency of fixing the spiral pipe fitting 30 is increased.

[0045] A demoulding coating structure is coated on the contact surface between the clamping protrusion 422 and the clamping groove 411 to avoid casting adhesion between the clamping groove 411 and the clamping protrusion 422.

[0046] Further preferably, the casting 2 has a neck 4, and the base 41 extends inward to form a forming protrusion 412. The forming protrusion 412 is adapted to cooperate with the casting mold 10 to form the neck 4. When the upper mold assembly 11 is opened after casting is completed, through the mutual limitation between the neck 4 and the forming protrusion 412 of the base 41, the stability of the casting 2 is improved, and the shaking is reduced while the knocking damage of the casting 2 is reduced; the base 41 is detachably arranged on the casting mold 10. Specifically, a base fixing groove 413 is provided on the lower mold assembly 12. The end of the base 41 is connected to the base fixing groove 413 in a plug-in and fitting manner along the Z-axis direction. The base fixing groove 413 is also coated with a demoulding agent or a demoulding coating and other materials. Therefore, during the demoulding process of the casting 2, the casting 2 is taken out of the casting mold 10 along the positive Z-axis direction. At this time, the base 41 is separated from the lower mold assembly 12 together with the casting 2. And because the base 41 and the support are also connected through the clamping groove 411 and the clamping protrusion 422, in the subsequent processing process, only the base 41 needs to be separated from the support, and the base 41 can be reused.

[0047] Among them, the casting mold 10 includes a lower mold assembly 12 provided at the bottom and an upper mold assembly 11 provided at the top. In this application document, the upper mold assembly 11 is preferably composed of four movable molds. When the working conditions are different, the lower mold assembly 12 at the bottom can also be a kind of movable mold structure.

[0048] Further preferably, the motor housing 5 has a shaft hole 6. The motor housing casting equipment 1 further includes an exhaust pipe 60. The exhaust pipe 60 is inserted into the sand core 20 and extends upward to the outside of the casting mold 10. The exhaust pipe 60 passes through the casting 2 to form a process hole 21. The process hole 21 is located in the shaft hole 6. Among them, the shaft hole 6 is obtained by later processing on the basis of the process hole 21. At the same time, the sand core 20 provides a positioning function for the exhaust pipe 60 in the Z-axis direction, and the gas in the sand core 20 during the pouring process is discharged through the exhaust pipe 60.

[0049] Preferably, this application document also provides a casting method for the motor housing 5 with a cooling water pipe, including the following steps: S1: Prepare the casting mold 10, sand core 20, spiral pipe fitting 30, support assembly 40 and exhaust pipe 60; the casting mold 10 includes a lower mold assembly 12 and an upper mold assembly 11; S2: Place the sand core 20 at a predetermined position on the lower mold, and insert the exhaust pipe 60 into the sand core 20; S3: Assemble the spiral pipe fitting 30 and the support assembly 40, and place them at a predetermined position on the lower mold assembly 12; S4: Close the lower mold assembly 12 and the upper mold assembly 11, and pour the molten metal into the casting mold 10 for pouring; S5: When the molten metal solidifies to 65% - 95%, pull out the exhaust pipe 60; S6: After the molten metal completely solidifies, the spiral pipe fitting 30 is integrally cast in the casting 2 to form a cooling water pipe, open the mold and take out the casting 2; S7: Process the casting 2 to form the motor housing 5.

[0050] Further preferably, there are multiple groups of the support assembly 40. Each group of the support assembly 40 includes a base 41 and a support plate 42. The support plate 42 is detachably arranged on the base 41. The support plate 42 is provided with a positioning groove 421 matching the number of turns of the spiral pipe fitting 30. The base 41 is provided with a clamping groove 411, and the support plate 42 is provided with a clamping protrusion 422; the above step S3 further includes the following steps: S31: Align the positioning groove 421 of the support plate 42 with the corresponding turns of the spiral pipe fitting 30 for assembly, and place the base 41 at a predetermined position on the lower mold assembly 12; S32: Align the clamping protrusion 422 of the support plate 42 with the clamping groove 411 of the base 41, and clamp the support plate 42 together with the spiral pipe fitting 30 onto the base 41 from top to bottom; in the above step S6, the support plate 42 is integrally cast in the casting 2, and the casting 2 together with the base 41 is taken out; and the base 41 can be removed from the casting 2 and reused.

[0051] Preferably, in the above step S1, it is necessary to preheat and shot blast the spiral pipe fitting 30. Among them, the preheating of the spiral pipe fitting 30 is to prevent the spiral pipe fitting 30 from undergoing thermal expansion and contraction during the casting process, thereby avoiding deformation of the spiral pipe fitting 30 during casting. Preferably, the spiral pipe fitting 30 is continuously preheated at 250 degrees Celsius in a high-temperature furnace for 2 hours. Similarly, a lubricating oil pipe 70 is also provided in the cavity of the casting 2, and the lubricating oil pipe 70 also needs to be preheated, and the preheating conditions are the same as those of the spiral pipe fitting 30.

[0052] Shot blasting operation is performed on the outer surface of the spiral pipe fitting 30. Here, the shot blasting treatment of the spiral pipe fitting 30 is before the molten metal pouring step. After the shot blasting treatment, a uniform microscopic rough structure is formed on the outer surface of the spiral pipe fitting 30, and this rough surface significantly improves the adhesion of the molten metal to optimize the bonding performance between the spiral pipe fitting 30 and the molten metal.

[0053] In the initial stage of pouring, when the high-temperature molten metal contacts the sand core 20, gas will be generated in the sand core 20, and then the gas in the sand core 20 can be quickly discharged through the exhaust pipe 60. Further, in the middle stage of solidification of the casting 2, the exhaust pipe 60 continues to work until a rigid skeleton is formed on the surface layer of the casting 2, that is, the main structure of the casting 2 solidifies to 65% to 95%. At this time, pulling out the exhaust pipe 60 can avoid the exhaust pipe 60 being left in the casting 2.

[0054] Among them, specifically, the exhaust pipe 60 is connected to the sand core 20 in an interference fit manner to prevent gas leakage of the sand core 20 relative to the exhaust pipe 60. Preferably, the insertion depth of the exhaust pipe 60 inserted into the sand core 20 is preferably 30 - 40 millimeters. At the same time, the exhaust pipe 60 extends vertically to the outside of the top riser cavity 81 to facilitate the discharge of the gas generated in the sand core 20 and prevent gas from entering the casting 2 to generate gas holes. The pulling-out timing of the exhaust pipe 60 is judged based on the solidification state of the casting 2. When the casting 2 solidifies to about 65% to 95%, a rigid skeleton has been formed on the surface layer of the casting 2 while there is still a small amount of liquid metal inside. At this time, the fixation of the exhaust pipe 60 is released, and the exhaust pipe 60 is gently rotated and then smoothly pulled out from the sand core 20 along the axis. The recovered exhaust pipe 60 can be reused in the next cycle after sand cleaning and coating repair.

[0055] Specifically, it is realized based on the solidification time threshold of the casting 2, that is, under different working conditions. For example, based on the total solidification time of the casting 2, according to the material and maximum wall thickness of the casting 2, the total duration required for the casting 2 to be completely solidified is calculated through a solidification simulation software or an empirical formula. Then, in the casting process of a motor housing 5, when the total solidification time of the casting 2 is 25 minutes, it is preferably to pull out the exhaust pipe 60 from the sand core 20 at the 22.5th minute after pouring to ensure that the subsequent solidification of the casting 2 is not affected.

[0056] Therefore, the process of casting a complete motor casing 5 by using the motor casing casting equipment 1 and its casting method in the present application document is described as follows: During the preliminary preparation process, the sand core 20 needs to be molded first, and a sand core 20 of a corresponding shape is made according to the inner cavity 3 structure of the motor casing 5. The manufacturing and molding process of the sand core 20 is preferably completed by 3D printing so that it can adapt to the more complex inner cavity 3 structure of the motor casing 5. After the sand core 20 is completed, a coating is applied to the surface of the sand core 20 to enhance the fire resistance and demolding properties. Then the processed sand core 20 is placed in the casting mold 10, and the position is adjusted so that the outer wall of the sand core 20 and the inner wall of the casting mold 10 form a casting 2 cavity.

[0057] It should also be noted that a detachable exhaust pipe 60 is pre-buried on the top of the sand core 20 to guide the gas generated during the pouring process and the decomposition gas of the sand core 20 to be directional discharged. When the surface layer of the casting 2 solidifies to form a rigid skeleton, the exhaust pipe 60 is rotated and pulled out for recycling.

[0058] Then, the surface of the spiral pipe 30 is shot peened, and the high-speed projectile impact is applied to the outer surface of the spiral pipe 30 through the equipment to form a uniform micro-rough texture, enhance its bonding force with the molten metal, and induce residual compressive stress on the surface to improve the thermal fatigue resistance. The prefabricated spiral pipe 30 is inserted downward along the cavity, and the support plate 42 connected to the outer wall of the spiral pipe 30 and the clamping groove 411 provided on the base 41 are plugged and fixed to ensure that the spiral pipe 30 is suspended in the center of the cavity and keeps a certain distance from the outer wall of the sand core 20 and the inner wall of the casting mold 10, wherein the casting 2 is made of aluminum, and the spiral pipe 30 is made of stainless steel, so that the melting point of the spiral pipe 30 is higher than that of the casting 2.

[0059] The upper mold assembly 11 and the lower mold assembly 12 are molded together by driving the device, and the molten metal enters the vertical runner 112 from the runner entrance through the pouring cup, and then the flow is controlled by the multi-stage buffer structure and the inner gate. After the molten metal enters the first horizontal runner 121 and the second horizontal runner 122, the four dispersed gates are used to realize the stable filling of the molten metal from bottom to top in the mold cavity of the casting 2. The thick wall area is provided with a shrinkage feed riser cavity to store high-temperature molten metal. Specifically, a first side riser cavity 82, a second side riser cavity 83 and a top riser cavity 81 are provided to store high-temperature molten metal for shrinkage feed.

[0060] Then, in the demoulding operation stage of the casting 2, the hydraulic locking force of the casting mold 10 is released, the ejector mechanism is started to separate the casting 2 from the sand core 20, the casting 2 is clamped by a robot and transferred to the vibrating sand-falling table, an arc cutting machine is used to remove the risers and flash on the casting 2, and the complex curved surface parts are finely trimmed by a CNC milling machine. At the same time, the process hole 21 left by the extension of the exhaust pipe 60 is further processed and expanded to be processed into a shaft hole 6, so as to obtain a finished motor housing 5.

[0061] The basic principles, main features and advantages of the present application have been described above. Those skilled in the art should understand that the present application is not limited by the above embodiments. What is described in the above embodiments and the specification is only the principle of the present application. Without departing from the spirit and scope of the present application, various changes and improvements will occur to the present application, and these changes and improvements all fall within the scope of the present application claimed. The scope of protection required by the present application is defined by the appended claims and their equivalents.

Claims

1. A motor housing casting device with a cooling water pipe, characterized in that, Including: A casting mold; A core, which is arranged inside the casting mold in the vertical direction. A casting cavity is formed between the casting mold and the core. After casting is completed, the core is removed to form the inner cavity of the casting; A spiral pipe fitting, which is sleeved outside the core in the vertical direction and is located in the casting cavity. The spiral pipe fitting is integrally cast in the casting to form a cooling water pipe; A support assembly, which is arranged in the casting cavity. The spiral pipe fitting is arranged on the support assembly. The support assembly is used to fix the spiral pipe fitting and restrict the pitch between any adjacent layers of the spiral pipe fitting.

2. The motor housing casting equipment with a cooling water pipe according to claim 1, wherein The support assembly has multiple groups distributed along the circumferential direction of the spiral pipe fitting. Each group of the support assembly includes a base and a support plate. The base is arranged on the casting mold. The support plate is detachably arranged on the base. The support plate is provided with positioning grooves matching the number of layers of the spiral pipe fitting. The spiral pipe fitting is adapted to be clamped in the positioning grooves to achieve fixation and pitch restriction, and the support plate is integrally cast in the casting.

3. The motor housing casting equipment with a cooling water pipe according to claim 1, wherein It further includes a spacer plate, which is provided with limiting grooves matching the number of layers of the spiral pipe fitting. The spiral pipe fitting is adapted to be clamped in the limiting grooves to achieve pitch restriction.

4. The motor housing casting equipment with a cooling water pipe according to claim 2, wherein The base is provided with a clamping groove, and the support plate is provided with a clamping protrusion. The support plate is adapted to be clamped in the clamping groove through the clamping protrusion to realize detachable connection with the base; and the support plate is adapted to be installed on the base in the vertical direction.

5. The motor housing casting equipment with a cooling water pipe according to claim 2, wherein The casting has a neck. The base extends inward to form a molding protrusion, and the molding protrusion is adapted to cooperate with the casting mold to form the neck; the base is detachably arranged on the casting mold.

6. The motor housing casting equipment with a cooling water pipe according to claim 1, wherein The motor housing has a shaft hole. The motor housing casting equipment further includes an exhaust pipe, which is inserted into the core and extends upward to the outside of the casting mold. The exhaust pipe passes through the casting to form a process hole, and the process hole is located in the shaft hole.

7. The motor housing casting equipment with a cooling water pipe according to claim 1, wherein The casting mold adopts a bottom gating structure. The casting mold includes an upper mold assembly and a lower mold assembly. The upper mold assembly is provided with a pouring gate, and the pouring gate is connected with a vertical sprue extending in the vertical direction. The vertical sprue extends to the lower mold assembly and is divided into a first horizontal sprue and a second horizontal sprue. The first horizontal sprue and the second horizontal sprue are respectively communicated with the two end inlets of the casting cavity; A buffer cavity is provided between the vertical runner transitioning to the first horizontal runner and the second horizontal runner, and a plurality of side riser cavities are provided on the side of the casting mold, and a top riser cavity is provided on the top.

8. A casting method for a motor housing with a cooling water pipe, characterized in that, It includes the following steps: S1: Prepare the casting mold, sand core, spiral pipe fitting, support assembly and exhaust pipe; the casting mold includes a lower mold assembly and an upper mold assembly; S2: Place the sand core at a predetermined position of the lower mold, and insert the exhaust pipe into the sand core; S3: Assemble the spiral pipe fitting and the support assembly, and place them at a predetermined position of the lower mold assembly; S4: Close the lower mold assembly and the upper mold assembly, and pour the molten metal into the casting mold for pouring; S5: When the molten metal solidifies to 65% - 95%, pull out the exhaust pipe; S6: After the molten metal is completely solidified, the spiral pipe fitting is integrally cast in the casting and forms a cooling water pipe, open the mold and take out the casting; S7: Process the casting to form a motor housing.

9. The casting method according to claim 8, characterized in that: There are multiple groups of support assemblies. Each group of support assemblies includes a base and a support plate. The support plate is detachably arranged on the base. Positioning grooves matching the number of spiral pipe fitting circles are provided on the support plate. A clamping groove is provided on the base, and a clamping protrusion is provided on the support plate; The above step S3 further includes the following steps: S31: Align the positioning grooves of the support plate with the corresponding circles of the spiral pipe fitting for assembly, and place the base at a predetermined position of the lower mold assembly; S32: Align the clamping protrusions of the support plate with the clamping grooves of the base, and clamp the support plate together with the spiral pipe fitting onto the base from top to bottom; In the above step S6, the support plate is integrally cast in the casting, and the casting is taken out together with the base; and the base can be removed from the casting and reused.

10. The casting method according to claim 8, characterized in that: In the above step S1, the spiral pipe fitting needs to be preheated and shot peened.

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