An integrated mold and casting method for motor rotor core casting

Abstract

The present invention belongs to the technical field of rotor core casting, and specifically is an integrated mold and casting method for motor rotor core casting, comprising: firstly controlling the casting equipment to separate the upper mold from the lower mold and insert the iron core onto the positioning rod; then controlling the casting equipment to close the mold, and then pouring the molten metal to complete the casting; after the rotor casting is completed, opening the mold to take out the iron core; finally, fine turning the removed iron core to remove the raised ring formed on the outer surface of the iron core during the casting process, so as to ensure that the surface of the iron core is smooth; the present invention has a simple structure, an integrally formed cavity is arranged in the upper mold and the lower mold, and the interface between the cavities is located in the middle position of the iron core, so as to reduce the gap in the mold and avoid burrs at the parting surface. At the same time, a raised ring is formed on the iron core, and the burrs are concentrated by the raised ring, so as to facilitate the cleaning of the existing burrs, thereby ensuring the good casting quality of the rotor core and the high qualified rate of the motor assembled subsequently.

Description

Technical Field

[0001] The invention belongs to the technical field of rotor core casting, in particular to an integrated casting mold and a casting method for a motor rotor core. Background Art

[0002] The rotor core is one of the main components of motor equipment. In the current rotor core processing process, slots are opened in the rotor core, and then the rotor core is matched in a die-casting mold, and molten pure aluminum liquid is injected into the die-casting mold, so that the pure aluminum liquid can fill the slots opened in the rotor core to form a cast aluminum part.

[0003] The existing casting mold parting surface is usually located at the interface between the end ring and the iron core. During the rotor production process, the location of the parting surface is prone to leakage of molten metal due to the existence of a gap, which in turn produces tiny burrs. These tiny burrs will be squeezed and dust will adhere due to the physical properties of alloy aluminum in the subsequent fine turning process of the rotor, resulting in the burrs being unable to be completely removed. After the motor is assembled, quality abnormalities such as inclusions and slag falling will occur in the assembly gap between the rotor and the stator, reducing the qualified rate of motor production and the quality of the motor. Summary of the invention

[0004] In order to make up for the shortcomings of the prior art, an integrally formed cavity is provided in the upper mold and the lower mold, and the interface between the cavities is located in the middle position of the iron core, so as to reduce the gap in the mold and avoid burrs at the parting surface. At the same time, a raised ring is formed on the iron core, and the burrs are concentrated by the raised ring to facilitate cleaning of the existing burrs, thereby ensuring the good casting quality of the rotor core and the high qualified rate of the subsequently assembled motor. The present invention proposes an integrated mold and a casting method for casting a motor rotor core.

[0005] The technical solution adopted by the present invention to solve the technical problem is: the motor rotor core casting integrated mold described in the present invention comprises an upper mold and a lower mold, and the upper mold and the lower mold are mounted on a positioning plate;

[0006] An integrally formed cavity is provided in the upper die and the lower die, and a space formed by combining the cavities on the upper die and the lower die is used to accommodate the iron core, and a forming groove is provided on the bottom surface of the cavity, and the forming groove is used to form an end ring on the end surface of the iron core;

[0007] The parting surface between the upper die and the lower die is located in the middle of the core height direction;

[0008] A positioning rod is installed on the bottom surface of the cavity, and the positioning rod is inserted into the through hole on the iron core;

[0009] A lifting plate is installed in the cavity, the molding groove and the positioning rod are located on the lifting plate, a cavity is opened in the positioning rod, a guide rod is installed on the bottom surface of the cavity, the guide rod is slidably installed in the cavity, and a spring is installed between the top of the guide rod and the inner wall of the cavity.

[0010] Preferably, the height of the positioning rod is less than the depth of the cavity;

[0011] The parting surfaces of the upper mold and the lower mold are provided with mounting grooves, in which contact rings are installed. The contact rings are made of metal material with good elasticity, and the thickness of the contact rings is greater than the depth of the mounting grooves. The contact rings are compressed and elastically deformed during mold closing.

[0012] Preferably, a spline groove is provided on the inner wall of the cavity, and a spline is provided on the surface of the guide rod, and the spline and the spline groove cooperate with each other.

[0013] Preferably, the inner diameter of the mounting groove is equal to the inner diameter of the cavity, the inner diameter of the contact ring is larger than the inner diameter of the mounting groove, and the outer diameter of the contact ring is equal to the outer diameter of the mounting groove.

[0014] Preferably, a conical surface is provided at one end of the positioning rod away from the lifting plate, an arc-shaped elastic sheet is mounted on the conical surface, and the elastic sheet abuts against the inner wall of the through hole.

[0015] Preferably, connecting pipes are installed in the upper mold and the lower mold, and the connecting pipes connect the external air source and the cavity to each other.

[0016] A method for casting a motor rotor core, the casting method being applicable to any one of the above-mentioned integrated molds for casting a motor rotor core, the casting method comprising the following steps:

[0017] S1: Control the casting equipment to separate the upper die from the lower die, and then insert the iron core into the positioning rod on the lower die through the through hole, so that the iron core is placed in the cavity;

[0018] S2: Control the casting equipment to close the upper mold and the lower mold, and then pour the molten metal through the pouring port on the mold to complete the casting of the rotor;

[0019] S3: After the rotor is cast, the upper die and the lower die are opened, and the iron core is removed from the die;

[0020] S4: The cast core is subjected to finish turning to remove the raised ring formed on the outer surface of the core during the casting process, to ensure that the core surface is smooth and to avoid residual burrs or raised bumps that affect the casting quality of the rotor core.

[0021] The beneficial effects of the present invention are as follows:

[0022] 1. The method for casting a motor rotor core described in the present invention can reduce the gap in the mold and the gap generated by the parting surface by arranging an integrally formed cavity on the upper mold and the lower mold, and making the parting surface between the upper mold and the lower mold located in the middle position on the outer side of the core, thereby avoiding burrs on the core and improving the quality of the core casting. At the same time, a raised ring is formed on the outer side of the core during the casting process, and the burrs on the core surface are effectively removed by fine turning the raised ring, thereby ensuring good casting quality of the core.

[0023] 2. The integrated mold for casting the motor rotor core described in the present invention, by arranging a mold cavity, a lifting plate, a guide rod, a cavity and a raised ring, makes it difficult for the core to leak molten metal due to the gap between the mold sleeve and the mold core and the gap between the parting surfaces during casting, resulting in burrs on the core and affecting the casting quality of the core. At the same time, the raised ring formed in the casting process can be used to concentrate possible burrs, which is convenient for effective removal of burrs during subsequent fine turning of the core, avoiding the residual burrs due to the physical properties of alloy aluminum, which affects the quality of the motor assembled later.

[0024] 3. The integrated mold for casting the motor rotor core described in the present invention, by setting a cavity, a guide rod, a lifting plate, a conical surface and an elastic sheet, allows the end face of the core to be stressed as a whole and pushed out of the mold stably during demolding, thereby avoiding uneven stress on the end face of the core causing bulges or skewness when pushed out, causing wear of the core and the cavity, and affecting the normal use of the mold. At the same time, when placing the core, the positioning rod can be used to position the core, which facilitates the accurate placement of the core into the cavity, and the elastic sheet can be used to fix the core to avoid the core from skewing or sliding before the mold is closed, which affects the normal casting of the core. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below in conjunction with the accompanying drawings.

[0026] Figure 1 It is a front view of the mold of the present invention;

[0027] Figure 2 It is a cross-sectional view of the mold of the present invention when it is working; the pouring gate, cooling water channel and other prior art are not marked;

[0028] Figure 3 It is a schematic diagram of the internal structure of the mold after mold closing of the present invention;

[0029] Figure 4 It is a structural schematic diagram of the iron core just cast in the present invention;

[0030] Figure 5 yes Figure 2 A partial enlarged view of the middle part;

[0031] Figure 6 yes Figure 2 A partial enlarged view of point B in the middle;

[0032] Figure 7 It is a flowchart of the steps of the casting method of the present invention;

[0033] In the figure: positioning plate 1, upper mold 2, cavity 21, lower mold 3, positioning rod 4, lifting plate 41, guide rod 42, cavity 43, spring 44, tapered surface 45, elastic sheet 451, connecting pipe 5, contact ring 6, iron core 7, end ring 71, guide bar 72, raised ring 73, through hole 74. DETAILED DESCRIPTION

[0034] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0035] like Figures 1 to 7 As shown, the motor rotor core casting integrated mold of the present invention comprises an upper mold 2 and a lower mold 3, and the upper mold 2 and the lower mold 3 are installed on a positioning plate 1;

[0036] An integrally formed cavity 21 is provided in the upper mold 2 and the lower mold 3. The space formed by the combination of the cavity 21 on the upper mold 2 and the lower mold 3 is used to accommodate the iron core 7. A molding groove is provided on the bottom surface of the cavity 21. The molding groove is used to form an end ring 71 on the end surface of the iron core 7.

[0037] The parting surface between the upper die 2 and the lower die 3 is located in the middle of the height direction of the iron core 7;

[0038] A positioning rod 4 is installed on the bottom surface of the cavity 21, and the positioning rod 4 is inserted into the through hole 74 on the iron core 7;

[0039] During operation, the mold installed on the casting equipment is opened to separate the upper mold 2 and the lower mold 3 from each other, and then the rotor core 7 to be cast is placed in the mold cavity 21 of the lower mold 3. After that, the casting equipment is controlled to close the mold, and the molten metal is poured into the mold through the pouring port to complete the casting of the rotor core 7. At the same time, after the casting of the rotor core 7 is completed, the upper mold 2 is separated from the lower mold 3, and the cast rotor core 7 is removed from the mold and subjected to subsequent processing to ensure that the quality of the rotor core 7 after casting is good;

[0040] At the same time, since the mold cavity 21 in the upper mold 2 and the lower mold 3 is integrally formed, it is possible to avoid a gap between the mold sleeve and the mold core in the upper mold 2 and the lower mold 3, which may cause aluminum leakage during the casting process and cause burrs on the edge of the rotor core 7, thereby ensuring the casting quality of the rotor core 7 and further ensuring the quality of the motor assembled later;

[0041] At the same time, since the cavity 21 in the upper mold 2 and the lower mold 3 have the same height, the parting surface of the upper mold 2 and the lower mold 3 after the mold is closed will be located in the middle position in the height direction of the iron core 7, avoiding the design in which the parting surface in the existing casting mold is located at the interface between the end ring 71 and the iron core 7, thereby avoiding the problem of burrs on the edge of the end ring 71 due to the parting surface and the problem that the burrs are difficult to remove, affecting the casting quality of the iron core 7 and the qualification rate of the subsequent assembly of the motor;

[0042] At the same time, since the parting surface is located in the middle of the iron core 7, the distance that the upper mold 2 needs to move is relatively reduced when closing and opening the mold, that is, when the upper mold 2 moves a distance equal to the height of the iron core 7, the upper mold 2 and the lower mold 3 will open, and the cast iron core 7 can be smoothly removed from the mold. There is no need to fully open the upper mold 2 and the lower mold 3 to fully open the upper mold 2 and the lower mold 3 to remove the cast iron core 7, unlike the existing mold with a parting surface set at the interface between the end ring 71 and the iron core 7. Therefore, the present mold can take and place the rotor iron core 7 in a relatively small opening and closing distance, reduce the space occupied by the mold when in use, and facilitate the installation and use of the mold on the casting equipment.

[0043] At the same time, a positioning rod 4 is installed in the cavity 21, so that when the core 7 is placed in the cavity 21, the core 7 can be quickly and accurately positioned by the positioning rod 4 inserted into the through hole 74, ensuring that the quality of the core 7 after casting is good;

[0044] A lifting plate 41 is installed in the mold cavity 21, the molding groove and the positioning rod 4 are located on the lifting plate 41, a cavity 43 is opened in the positioning rod 4, a guide rod 42 is installed on the bottom surface of the mold cavity 21, the guide rod 42 is slidably installed in the cavity 43, and a spring 44 is installed between the top of the guide rod 42 and the inner wall of the cavity 43;

[0045] Since a spring 44 is installed between the top of the guide rod 42 and the inner wall of the cavity 43, the positioning rod 4 and the lifting plate 41 will rise from the cavity 21 under the action of the spring 44, and then the positioning rod 4 will extend out of the cavity 21. Therefore, when the rotor core 7 is placed, the core 7 will be installed on the positioning rod 4 first, and the core 7 will be initially positioned. After that, when the casting equipment controls the upper mold 2 and the lower mold 3 to close the mold, the positioning rods 4 on the upper mold 2 and the lower mold 3 will be inserted into the through hole 74, and then the upper mold 2 The upper and lower molds 2 and 3 are used to squeeze the two ends of the iron core 7, so that the iron core 7 drives the lifting plate 41 and the positioning rod 4 to move into the cavity 21 until the lifting plate 41 contacts the bottom surface of the cavity 21, thereby completing the placement of the iron core 7 in the cavity 21 and the closing operation of the upper mold 2 and the lower mold 3, so as to ensure that the iron core 7 is accurately positioned when the iron core 7 is placed in the mold, and avoid contact or friction between the iron core 7 and the inner wall of the cavity 21, thereby damaging the iron core 7 or the inner wall of the cavity 21, thereby ensuring the good quality of subsequent casting of the iron core 7;

[0046] At the same time, when the iron core 7 is cast and the rotor iron core 7 needs to be removed from the mold, the upper mold 2 and the lower mold 3 are opened by the casting equipment. After that, under the action of the spring 44, the lifting plate 41 and the positioning rod 4 will drive the iron core 7 to gradually extend out of the cavity 21, so as to facilitate the removal of the cast iron core 7 from the mold. At the same time, when the iron core 7 is taken out, the end face of the iron core 7 facing the bottom surface of the cavity 21 is contacted and lifted as a whole by the lifting plate 41, thereby avoiding adverse effects on the end face of the iron core 7 during the ejection process, so that a convex structure is formed on the end face of the iron core 7, which affects the motor movement after the rotor is assembled. At the same time, the positioning and installation of the iron core 7 by the positioning rod 4 can also ensure the stability of the iron core 7 when the iron core 7 is separated from the mold, and prevent the iron core 7 from being offset or deflected, resulting in wear between the iron core 7 and the inner wall of the cavity 21, affecting the casting processing quality of the rotor iron core 7.

[0047] At the same time, since the diameter of the lifting plate 41 is the same as the diameter of the cavity 21, when the lifting plate 41 drives the rotor core 7 to be demolded, the lifting plate 41 will also scrape and clean the inner wall of the cavity 21 to avoid residual metal particles or metal slag on the inner wall of the cavity 21, which will affect the subsequent casting quality of the rotor core 7.

[0048] As an embodiment of the present invention, the height of the positioning rod 4 is less than the depth of the cavity 21;

[0049] The parting surfaces of the upper mold 2 and the lower mold 3 are provided with mounting grooves, in which a contact ring 6 is installed. The contact ring 6 is made of a metal material with good elasticity. The thickness of the contact ring 6 is greater than the depth of the mounting groove. The contact ring 6 is compressed and elastically deformed when the mold is closed.

[0050] Since the contact ring 6 is made of a metal material with good elasticity, when the upper mold 2 and the lower mold 3 are molded together, the contact ring 6 on the parting surface will be squeezed, causing the contact ring 6 to be elastically deformed, so that the contact ring 6 has the effect of a sealing ring, thereby ensuring the sealing effect at the parting surface between the upper mold 2 and the lower mold 3 during the casting process, and preventing the poured metal liquid from leaking from the parting surface, affecting the casting quality of the rotor core 7 and generating too many burrs on the rotor core 7. At the same time, since the height of the positioning rod 4 is less than the depth of the cavity 21, after the mold is closed, the positioning rods 4 on the upper mold 2 and the lower mold 3 will not contact each other, thereby preventing the two positioning rods 4 from abutting against each other when the mold is closed, affecting the elastic deformation and sealing effect of the contact ring 6;

[0051] At the same time, since the thickness of the contact ring 6 is greater than the depth of the mounting groove, when the upper mold 2 and the lower mold 3 are closed, the contact ring 6 between the two will first come into contact and produce elastic deformation, thereby buffering the impact force existing when the upper mold 2 and the lower mold 3 are closed, avoiding direct contact and impact between the parting surfaces on the upper mold 2 and the lower mold 3, resulting in damage or wear of the parting surfaces, affecting the service life and normal use of the mold.

[0052] As an embodiment of the present invention, a spline groove is provided on the inner wall of the cavity 43, and a spline is provided on the surface of the guide rod 42, and the spline and the spline groove cooperate with each other;

[0053] By providing the splines and spline grooves that cooperate with each other, when the positioning rod 4 moves up and down along the guide rod 42, the positioning rod 4 and the lifting plate 41 will not rotate relative to the guide rod 42, thereby ensuring the accurate positioning and position stability of the rotor core 7 in the mold, and further ensuring the good casting quality of the rotor core 7. At the same time, it can also prevent the lifting plate 41 from tilting or shaking when it is raised or lowered after it rotates, resulting in additional friction between the lifting plate 41 and the inner wall of the cavity 21, causing damage to the surfaces of both, and affecting the service life of the mold.

[0054] As an embodiment of the present invention, the inner diameter of the mounting groove is equal to the inner diameter of the cavity 21, the inner diameter of the contact ring 6 is larger than the inner diameter of the mounting groove, and the outer diameter of the contact ring 6 is equal to the outer diameter of the mounting groove;

[0055] Since the inner diameter of the contact ring 6 is larger than the inner diameter of the mounting groove, an annular space exists between the inner side surface of the contact ring 6 and the outer side surface of the rotor core 7 during the casting process of the rotor core 7, that is, a raised ring 73 is formed on the surface of the rotor core 7 after casting, and the raised ring 73 is connected to the guide bar 72 on the rotor core 7. At this time, the burrs that may exist at the parting surface between the upper mold 2 and the lower mold 3 are concentrated and separated by the formed raised ring 73, so that the existing burrs will not directly exist on the end ring 71, the guide bar 72 or the surface of the core 7, so as to avoid affecting the casting quality of the rotor core 7. At the same time, the existing burrs will be concentrated by the existence of the raised ring 73. After that, the rotor core 7 after casting is fine-turned to remove the raised ring 73 and possible burrs, so as to ensure the good casting quality of the rotor core 7. At the same time, through the effect of the raised ring 73, the severity of the extrusion phenomenon and dust adhesion caused by the physical properties of the alloy aluminum is reduced during fine turning, so as to ensure that the burrs are completely removed and avoid affecting the quality of the motor assembled later.

[0056] As an embodiment of the present invention, the end of the positioning rod 4 away from the lifting plate 41 is provided with a conical surface 45, and an arc-shaped elastic sheet 451 is installed on the conical surface 45, and the elastic sheet 451 abuts against the inner wall of the through hole 74;

[0057] By providing the tapered surface 45 on the positioning rod 4, when the rotor core 7 is placed on the positioning rod 4, the positioning rod 4 can be conveniently inserted into the through hole 74, thereby avoiding the conflict or collision between the positioning rod 4 and the core 7, and reducing the difficulty of inserting the positioning rod 4 into the through hole 74;

[0058] At the same time, after the iron core 7 is placed on the positioning rod 4, the elastic sheet 451 on the conical surface 45 will abut against the inner wall of the through hole 74, so that the iron core 7 can stay stably on the positioning rod 4, avoiding the iron core 7 from being unstable before the mold is closed, and avoiding slipping or tilting, resulting in the iron core 7 colliding with the inner wall of the cavity 21 or the iron core 7 scratching the inner wall of the cavity 21 when the upper mold 2 and the lower mold 3 are closed, affecting the normal use of the mold and the casting quality of the rotor iron core 7.

[0059] As an embodiment of the present invention, a connecting pipe 5 is installed in the upper mold 2 and the lower mold 3, and the connecting pipe 5 connects the external air source and the cavity 43;

[0060] The external air source is connected to the cavity 43 through the connecting pipe 5, so that when the guide rod 42 moves in the cavity 43, the air pressure in the cavity 43 can be automatically balanced to avoid excessive positive or negative pressure in the cavity 43, which affects the relative movement of the guide rod 42 in the cavity 43. At the same time, during the casting process, the cast metal liquid of the rotor core 7 or the lifting plate 41 may adhere to the inner wall of the cavity 21, resulting in the elastic force generated by the spring 44 being unable to drive the lifting plate 41 and the rotor core 7 to move, affecting the demolding of the cast rotor core 7. At this time, due to the contact between the guide rod 42 and the cavity 43 are relatively sealed, and the positive pressure of the external air source is introduced into the cavity 43 through the connecting pipe 5, increasing the pressure in the cavity 43, thereby assisting the lifting plate 41 to move toward the outside of the cavity 21, and facilitating the demolding of the cast rotor core 7 from the mold. Similarly, when placing the rotor core 7, negative pressure is introduced into the cavity 43 through the external air source, which can drive or assist the lifting plate 41 to move toward the cavity 21, so as to facilitate the stable and accurate entry of the rotor core 7 into the cavity 21, facilitate the closing of the upper mold 2 and the lower mold 3, and the subsequent casting, thereby ensuring the good casting quality of the rotor core 7.

[0061] A method for casting a motor rotor core, the casting method being applicable to any one of the above-mentioned integrated molds for casting a motor rotor core, the casting method comprising the following steps:

[0062] S1: Control the casting equipment to separate the upper mold 2 from the lower mold 3, and then insert the iron core 7 into the positioning rod 4 on the lower mold 3 through the through hole 74, so that the iron core 7 is placed in the mold cavity 21;

[0063] S2: Control the casting equipment to close the upper mold 2 and the lower mold 3, and then pour the molten metal through the pouring port on the mold to complete the casting of the rotor;

[0064] S3: After the rotor casting is completed, the upper mold 2 and the lower mold 3 are opened, and the iron core 7 is removed from the mold;

[0065] S4: The cast iron core 7 is subjected to finish turning to remove the raised ring 73 formed on the outer surface of the iron core 7 during the casting process, so as to ensure that the surface of the iron core 7 is smooth and avoid residual burrs or raised protrusions that affect the casting quality of the rotor iron core 7.

[0066] The specific workflow is as follows:

[0067] During operation, the mold installed on the casting equipment is opened to separate the upper mold 2 and the lower mold 3 from each other, and then the rotor core 7 to be cast is placed in the mold cavity 21 of the lower mold 3. After that, the casting equipment is controlled to close the mold, and the molten metal is poured into the mold through the pouring port to complete the casting of the rotor core 7. At the same time, after the casting of the rotor core 7 is completed, the upper mold 2 is separated from the lower mold 3, and the cast rotor core 7 is removed from the mold and subjected to subsequent processing to ensure that the quality of the rotor core 7 after casting is good;

[0068] At the same time, since the mold cavity 21 in the upper mold 2 and the lower mold 3 is formed as one piece, it is possible to avoid the gap between the mold sleeve and the mold core in the upper mold 2 and the lower mold 3, which may cause aluminum leakage during the casting process and cause burrs on the edge of the rotor core 7;

[0069] At the same time, since the cavity 21 in the upper mold 2 and the lower mold 3 have the same height, the parting surface of the upper mold 2 and the lower mold 3 after the mold is closed will be located in the middle position in the height direction of the iron core 7, avoiding the design in which the parting surface in the existing casting mold is located at the interface between the end ring 71 and the iron core 7, thereby avoiding the problem of burrs on the edge of the end ring 71 due to the parting surface and the difficulty in removing the burrs;

[0070] At the same time, since the parting surface is located at the middle position of the iron core 7, the distance that the upper mold 2 needs to move during mold closing and mold opening will be relatively reduced, that is, when the upper mold 2 moves a distance equal to the height of the iron core 7, the upper mold 2 and the lower mold 3 will open, and the cast iron core 7 can be smoothly removed from the mold. There is no need to move the upper mold 2 twice the height of the iron core 7 to fully open the upper mold 2 and the lower mold 3, and then take out the cast iron core 7, as in the existing mold with the parting surface set at the interface between the end ring 71 and the iron core 7.

[0071] At the same time, a positioning rod 4 is installed in the cavity 21, so that when the core 7 is placed in the cavity 21, the core 7 can be quickly and accurately positioned by the positioning rod 4 inserted into the through hole 74, ensuring that the quality of the core 7 after casting is good;

[0072] When placing the rotor core 7, the core 7 is first sleeved and installed on the positioning rod 4 to perform preliminary positioning of the core 7. Then, when the casting equipment controls the upper mold 2 and the lower mold 3 to close the mold, the positioning rods 4 on the upper mold 2 and the lower mold 3 are inserted into the through holes 74. Then, the upper mold 2 and the lower mold 3 squeeze the two ends of the core 7, so that the core 7 drives the lifting plate 41 and the positioning rod 4 to move into the cavity 21 until the lifting plate 41 contacts the bottom surface of the cavity 21, thereby completing the placement of the core 7 in the cavity 21 and the closing operation of the upper mold 2 and the lower mold 3.

[0073] At the same time, when the iron core 7 is cast and the rotor iron core 7 needs to be removed from the mold, the upper mold 2 and the lower mold 3 are opened by the casting equipment. Then, under the action of the spring 44, the lifting plate 41 and the positioning rod 4 drive the iron core 7 to gradually extend out of the cavity 21, so that the cast iron core 7 can be removed from the mold. At the same time, when leaving the mold, the iron core 7 is ensured to be stable to prevent the iron core 7 from being offset or deflected.

[0074] Since the contact ring 6 is made of a metal material with good elasticity, when the upper mold 2 and the lower mold 3 are molded together, the contact ring 6 on the parting surface will be squeezed, so that the contact ring 6 is elastically deformed, so that the contact ring 6 produces a sealing ring effect. At the same time, since the height of the positioning rod 4 is less than the depth of the cavity 21, after the mold is closed, the positioning rods 4 on the upper mold 2 and the lower mold 3 will not contact each other, thereby preventing the two positioning rods 4 from abutting against each other when the mold is closed;

[0075] At the same time, since the thickness of the contact ring 6 is greater than the depth of the mounting groove, when the upper mold 2 and the lower mold 3 are closed, the contact ring 6 between the two will first come into contact and produce elastic deformation, thereby buffering the impact force existing when the upper mold 2 and the lower mold 3 are closed;

[0076] By providing mutually matching splines and spline grooves, when the positioning rod 4 moves up and down along the guide rod 42, the positioning rod 4 and the lifting plate 41 will not rotate relative to the guide rod 42;

[0077] Since the inner diameter of the contact ring 6 is larger than the inner diameter of the mounting groove, an annular space exists between the inner side surface of the contact ring 6 and the outer side surface of the rotor core 7 during the casting process of the rotor core 7, that is, a raised ring 73 is formed on the surface of the rotor core 7 after casting, and the raised ring 73 is connected to the guide bar 72 on the rotor core 7. At this time, the burrs that may exist at the parting surface between the upper mold 2 and the lower mold 3 are concentrated and separated by the formed raised ring 73, so that the existing burrs will not exist directly on the end ring 71, the guide bar 72 or the surface of the core 7. At the same time, the existing burrs will be concentrated by the existence of the raised ring 73. After that, the rotor core 7 after casting is fine-turned to remove the raised ring 73 and the possible burrs.

[0078] By providing the conical surface 45 on the positioning rod 4, when the rotor core 7 is placed on the positioning rod 4, the positioning rod 4 can be conveniently inserted into the through hole 74;

[0079] At the same time, after the iron core 7 is placed on the positioning rod 4, the elastic sheet 451 on the tapered surface 45 will abut against the inner wall of the through hole 74, so that the iron core 7 can stay stably on the positioning rod 4, thereby preventing the iron core 7 from being unstable before mold closing, and from slipping or tilting;

[0080] The external air source is connected to the cavity 43 through the connecting pipe 5, so that when the guide rod 42 moves in the cavity 43, the air pressure in the cavity 43 can be automatically balanced. At the same time, during the casting process, the cast metal liquid of the rotor core 7 or the lifting plate 41 may adhere to the inner wall of the cavity 21, resulting in the elastic force generated by the spring 44 being unable to drive the lifting plate 41 and the rotor core 7 to move, affecting the demoulding of the cast rotor core 7. At this time, due to the relative sealing between the guide rod 42 and the cavity 43, the guide rod 42 and the cavity 43 are relatively sealed. The connecting pipe 5 introduces the positive pressure of the external air source into the cavity 43, increasing the pressure in the cavity 43, thereby assisting the lifting plate 41 to move toward the outside of the cavity 21, making it easier for the cast rotor core 7 to be demolded from the mold. Similarly, when placing the rotor core 7, negative pressure is introduced into the cavity 43 through the external air source, which can drive or assist the lifting plate 41 to move toward the cavity 21, making it easier for the rotor core 7 to enter the cavity 21 stably and accurately, facilitating the closing of the upper mold 2 and the lower mold 3, and the subsequent casting.

[0081] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An integrated mold for casting a motor rotor core, comprising an upper mold (2) and a lower mold (3), wherein the upper mold (2) and the lower mold (3) are mounted on a positioning plate (1); Features: An integrally formed cavity (21) is provided in the upper mold (2) and the lower mold (3); a space formed by combining the cavities (21) on the upper mold (2) and the lower mold (3) is used to accommodate the iron core (7); a molding groove is provided on the bottom surface of the cavity (21); the molding groove is used to form an end ring (71) on the end surface of the iron core (7); The parting surface between the upper die (2) and the lower die (3) is located in the middle of the height direction of the iron core (7); A positioning rod (4) is installed on the bottom surface of the cavity (21), and the positioning rod (4) is inserted into a through hole (74) on the iron core (7); A lifting plate (41) is installed in the mold cavity (21), the molding groove and the positioning rod (4) are located on the lifting plate (41), a cavity (43) is opened in the positioning rod (4), a guide rod (42) is installed on the bottom surface of the mold cavity (21), the guide rod (42) is slidably installed in the cavity (43), and a spring (44) is installed between the top end of the guide rod (42) and the inner wall of the cavity (43).

2. The integrated mold for casting a motor rotor core according to claim 1, characterized in that: The height of the positioning rod (4) is smaller than the depth of the cavity (21); The parting surfaces of the upper mold (2) and the lower mold (3) are provided with mounting grooves, in which a contact ring (6) is installed. The contact ring (6) is made of a metal material with good elasticity. The thickness of the contact ring (6) is greater than the depth of the mounting groove. The contact ring (6) is compressed and elastically deformed when the mold is closed.

3. The motor rotor core casting integrated mold according to claim 1, characterized in that: A spline groove is provided on the inner wall of the cavity (43), and a spline is provided on the surface of the guide rod (42), and the spline and the spline groove cooperate with each other.

4. The integrated mold for casting a motor rotor core according to claim 2, characterized in that: The inner diameter of the mounting groove is equal to the inner diameter of the cavity (21), the inner diameter of the contact ring (6) is greater than the inner diameter of the mounting groove, and the outer diameter of the contact ring (6) is equal to the outer diameter of the mounting groove.

5. The integrated mold for casting a motor rotor core according to claim 1, characterized in that: A conical surface (45) is provided at one end of the positioning rod (4) away from the lifting plate (41), and an arc-shaped elastic sheet (451) is installed on the conical surface (45), and the elastic sheet (451) abuts against the inner wall of the through hole (74).

6. The integrated mold for casting a motor rotor core according to claim 1, characterized in that: A connecting pipe (5) is installed inside the upper mold (2) and the lower mold (3), and the connecting pipe (5) connects the external air source and the cavity (43) to each other.

7. A method for casting a motor rotor core, characterized in that: The casting method is applicable to a motor rotor core casting integrated mold as described in any one of claims 1 to 6 above, and the casting method comprises the following steps: S1: Controlling the casting equipment to separate the upper mold (2) from the lower mold (3), and then inserting the iron core (7) into the positioning rod (4) on the lower mold (3) through the through hole (74), so that the iron core (7) is placed in the mold cavity (21); S2: Controlling the casting equipment to close the upper mold (2) and the lower mold (3), and then pouring the molten metal through the pouring port on the mold to complete the casting of the rotor; S3: After the rotor casting is completed, the upper mold (2) and the lower mold (3) are opened, and the iron core (7) is removed from the mold; S4: The cast iron core (7) is subjected to a precision turning process to remove the raised ring (73) formed on the outer surface of the iron core (7) during the casting process, thereby ensuring that the surface of the iron core (7) is smooth and clean and avoiding residual burrs that affect the casting quality of the rotor iron core (7).

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