Die-casting die for motor rotor core

Abstract

A motor rotor iron core die-casting die belongs to the technical field of iron core die-casting and comprises a front die and a rear die, the lower surface of the front die is recessed to form a connecting groove, the upper surface of the rear die is recessed to form a containing space for containing a rotor iron core, and the upper surface of the rear die protrudes to form a connecting part which is located at the edge of the containing space. The connecting part and the connecting groove are matched to enable the front mold and the rear mold to be attached to form a die-casting cavity, and an aluminum injection opening communicated with the die-casting cavity is downwards formed in the upper surface of the front mold. The die-casting die has the beneficial effects that through the connecting part and the connecting groove, the contact mode of the parting surfaces of the front die and the rear die is changed, and through the embedding mode, the sealing effect on the die-casting cavity is enhanced, burrs are reduced, and meanwhile, the direction of the burrs is changed, so that the burrs do not influence the actual size of a rotor; the burrs are prevented from influencing the assembling process of the stator and the rotor, and the product qualification rate is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of iron core die-casting, in particular to a die-casting die for an electric motor rotor iron core. Background Art

[0002] A motor is an electromagnetic device that uses the law of electromagnetic induction to convert or transmit electrical energy. The rotor core is a key component of the motor. After the laminations are stacked, the rotor core is often pressure-casted from aluminum. The rotor core is placed in a mold, where aluminum is injected and die-cast. After cooling and demolding, the rotor core forms the motor rotor.

[0003] Existing iron core die-casting molds use multiple modules to form the mold. Usually, for the convenience of production, the parting surfaces of the mold are set in parallel. Due to the influence of dust, residue and other environmental factors at the production site, gaps that are difficult to distinguish with the naked eye will appear between the mold parting surfaces, resulting in aluminum leakage and burrs extending outward on the edge of the rotor iron core. Since the burrs are difficult to completely remove in subsequent processes, the remaining burrs will increase the actual size of the rotor, affect the assembly with the stator, and reduce the qualified rate of motor production. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a motor rotor core die-casting mold, and its technical solution is as follows.

[0005] A motor rotor core die-casting mold includes a front mold and a rear mold. The lower surface of the front mold is recessed to form a connecting groove, and the upper surface of the rear mold is recessed to form an accommodating space for accommodating the rotor core. The upper surface of the rear mold is raised to form a connecting portion, and the connecting portion is located at the edge of the accommodating space. The connecting portion and the connecting groove cooperate to make the front mold and the rear mold fit together to form a die-casting cavity. The upper surface of the front mold is provided with an aluminum injection port downwardly connected to the die-casting cavity.

[0006] Furthermore, the connecting portion surrounds the accommodating space.

[0007] Furthermore, the lower end surface of the front mold is recessed upward to form an upper annular groove, and the bottom surface of the accommodating space is recessed downward to form a lower annular groove. The upper annular groove and the lower annular groove fit the circular surface of the rotor core, and the upper annular groove and the lower annular groove are symmetrically arranged about the rotor core.

[0008] Furthermore, the gap of the rotor core forms a connecting groove, and the connecting groove connects the upper annular groove and the lower annular groove.

[0009] Furthermore, an ejection groove is upwardly provided on the lower end surface of the rear mold, and the ejection groove is connected to the accommodating space.

[0010] Furthermore, the motor rotor core die-casting mold further includes an ejector pin, which is movably disposed in the ejection groove.

[0011] Furthermore, a protruding portion is provided at the end of the ejector pin, the bottom of the protruding portion is recessed, and the protruding portion cooperates with the central raised portion of the rotor core for positioning.

[0012] Furthermore, the front mold and the rear mold are cylindrical, and the axis of the front mold coincides with the axis of the rear mold.

[0013] Furthermore, the connecting groove and the connecting portion are arranged around the axis of the front mold.

[0014] Furthermore, the aluminum injection port is a conical structure.

[0015] The benefit of the present invention lies in that, through the connecting portion and the connecting groove, the contact mode of the parting surfaces of the front mold and the rear mold is changed, and through the interlocking mode, the sealing effect of the die-casting cavity is enhanced, the occurrence of burrs is reduced, and the direction of the burrs is changed so that the burrs do not affect the actual size of the rotor, thereby avoiding the burrs affecting the assembly process of the stator and the rotor, and improving the product qualification rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a cross-sectional view of a die-casting mold for a motor rotor core according to the present invention.

[0017] Figure 2 for Figure 1 Another cross-sectional view of the motor rotor core die-casting mold.

[0018] Figure 3 for Figure 1 Schematic diagram of the motor rotor core die-casting mold.

[0019] In the picture:

[0020] 1. Front mold; 11. Connecting groove; 12. Aluminum injection port; 13. Upper annular groove; 2. Back mold; 21. Connecting part; 22. Accommodating space; 23. Lower annular groove; 24. Ejector groove; 3. Rotor core; 31. Connecting groove; 4. Ejector pin; 41. Ejector part. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of this invention are for the purpose of describing specific embodiments only and are not intended to limit this invention. The term "and / and" used herein includes any and all combinations of one or more of the related listed items.

[0023] The following is an example of Figure 1-3 The utility model is described in further detail.

[0024] A motor stator core mold comprises a front mold 1, a rear mold 2, a rotor core 3, an ejector pin 4 and a cooling mechanism 5.

[0025] The lower end surface of the front mold 1 is recessed upward to form a connecting groove 11 and an upper annular groove 13. The upper end surface of the front mold 1 is downwardly provided with an aluminum injection port 12 that communicates with the upper annular groove 13. The aluminum injection port 12 is connected to the upper annular groove 13. Specifically, in this embodiment, the aluminum injection port 12 has a conical structure, and the front mold 1 is cylindrical.

[0026] The center of the upper end surface of the rear mold 2 is recessed downward to form an accommodating space 22. The upper surface of the rear mold 2 is raised upward to form a connecting portion 21. The connecting portion 21 is located at the edge of the accommodating space 22. Specifically, in this embodiment, the connecting portion 21 surrounds the accommodating space 22, and the rear mold 2 is cylindrical. The bottom surface of the accommodating space 22 is recessed downward to form a lower annular groove 23. The lower end surface of the rear mold 2 is formed upwardly through an ejection groove 24, which is connected to the accommodating space 22.

[0027] The gaps in the rotor core 3 form communication grooves 31 .

[0028] The ejector pin 4 is provided with an ejection portion 41 . Specifically, in this embodiment, the bottom of the ejection portion 41 is recessed, so that the ejection portion 41 is matched with the central raised portion of the rotor core 3 for positioning.

[0029] The invention discloses a structural relationship of a die-casting mold for a motor rotor core.

[0030] The ejector pin 4 is movably mounted on the ejection groove 24, and the rotor core 3 is placed in the accommodating space 22. The connecting portion 21 and the connecting groove 11 cooperate to close the front mold 1 and the rear mold 2. The axes of the front mold 1 and the rear mold 2 coincide with each other. The upper annular groove 13, the accommodating space 22 and the lower annular groove 23 form a die-casting cavity. The connecting groove 31 connects the upper annular groove 13 and the lower annular groove 23. The ejection portion 41 and the rotor core 3 cooperate to position the rotor core 3.

[0031] The invention discloses a process for using a die-casting mold for a motor rotor core.

[0032] The rotor core 3 is placed in the accommodating space 22 and positioned by the ejector 41. The front mold 1 and rear mold 2 are closed together through the connecting portion 21 and the connecting slot 11, securing the rotor core 3 in the die-casting cavity. Aluminum is poured into the die-casting cavity through the aluminum injection port 12. After the molten aluminum cools, the aluminum ring of the motor rotor is formed. The front mold 1 is removed and the aluminum part is ejected from the mold using the ejector 4. After the die-casting is completed, the burrs formed are distributed along the axial direction of the rotor core 3, so as not to affect the actual size of the rotor core. The aluminum ring is then fine-machined and any excess burrs are removed.

[0033] The benefit of the present invention lies in that, through the connecting portion 21 and the connecting groove 11, the contact mode of the parting surface of the front mold 1 and the rear mold 2 is changed, and the sealing effect of the die-casting cavity is enhanced by the interlocking method, the appearance of burrs is reduced, and the direction of the burrs is changed at the same time, so that the burrs do not affect the actual size of the rotor, the burrs are prevented from affecting the assembly process of the stator and the rotor, and the product qualification rate is improved.

[0034] The above embodiment merely represents one embodiment of the present invention and should not be construed as limiting the scope of the patent. It should be noted that those skilled in the art will be able to make various modifications and improvements without departing from the spirit of the present invention. These modifications and improvements are equivalent to those made to the above embodiment based on the essential technology of the present invention and fall within the scope of protection of the present invention.

Claims

1. A motor rotor core die-casting mold, comprising a front mold and a rear mold, characterized in that: The lower surface of the front mold is recessed to form a connecting groove, the upper surface of the rear mold is recessed to form an accommodating space for accommodating the rotor core, the upper surface of the rear mold is raised to form a connecting portion, and the connecting portion is located at the edge of the accommodating space. The connecting portion and the connecting groove cooperate to make the front mold and the rear mold fit together to form a die-casting cavity, and an aluminum injection port connected to the die-casting cavity is provided downward on the upper surface of the front mold.

2. The motor rotor core die-casting mold according to claim 1, characterized in that :The connecting portion surrounds the accommodating space.

3. The motor rotor core die-casting mold according to claim 1, characterized in that : The lower end surface of the front mold is recessed upward to form an upper annular groove, and the bottom surface of the accommodating space is recessed downward to form a lower annular groove. The upper annular groove and the lower annular groove fit the circular surface of the rotor core, and the upper annular groove and the lower annular groove are symmetrically arranged about the rotor core.

4. The motor rotor core die-casting mold according to claim 3, characterized in that: The gap of the rotor core forms a communication groove, and the communication groove connects the upper annular groove and the lower annular groove.

5. The motor rotor core die-casting mold according to claim 1, characterized in that: An ejection groove is upwardly provided on the lower end surface of the rear mold, and the ejection groove is connected to the accommodating space.

6. The motor rotor core die-casting mold according to claim 5, characterized in that: The motor rotor core die-casting mold further includes an ejector pin, which is movably arranged in the ejection groove.

7. The motor rotor core die-casting mold according to claim 6, characterized in that: The end of the ejector pin is provided with an ejection portion, the bottom of the ejection portion is concave, and the ejection portion is matched with the central protruding portion of the rotor core for positioning.

8. The motor rotor core die-casting mold according to claim 1, characterized in that: The front mold and the rear mold are cylindrical, and the axis of the front mold coincides with the axis of the rear mold.

9. The motor rotor core die-casting mold according to claim 8, characterized in that: The connecting groove and the connecting portion are arranged around the axis of the front mold.

10. The motor rotor core die-casting mold according to claim 1, characterized in that: The aluminum injection port is a tapered structure.

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