CN219522896U - Motor rotor injection mould - Google Patents

Abstract

The utility model discloses an injection mold for a motor rotor, which comprises a silicon steel sheet main body and a plurality of magnets embedded in the silicon steel sheet main body, wherein the motor rotor comprises an upper mold, and the upper mold comprises an injection runner, a first upper mold core and a second upper mold core; the lower die comprises a lower die core, a lower die core and a middle ejector rod; the first upper die core, the second upper die core, the lower die core and the lower die core enclose a motor rotor accommodating cavity, and the middle ejector rod is positioned in the center of the motor rotor accommodating cavity; the lower mold core is provided with positioning rods which are in one-to-one correspondence with positioning pits arranged on the silicon steel sheet main body; after the motor rotor is received in the motor rotor accommodating cavity, a shaft hole of the motor rotor is sleeved on the middle ejector rod, and the positioning concave is clamped into the upper positioning end of the positioning column; the ejection assembly comprises a plurality of ejector rods, the upper ends of the ejector rods penetrate through the lower mold core from bottom to top and then are in contact with the magnet, the problem that the magnet moves in the injection molding process to cause injection molding defective products is solved, the position positioning requirement can be rapidly achieved, and the production efficiency is improved.

Description

Motor rotor injection mould

Technical Field

The utility model belongs to the technical field of injection molds, and particularly relates to an injection mold for a motor rotor.

Background

As shown in fig. 1-2, the motor rotor 10 to be injection molded comprises a stacked silicon steel sheet main body 11, a plurality of magnets 12 are embedded in the silicon steel sheet main body 11, a gap 111 is formed between the outermost peripheral surface of the magnets 12 and the outermost peripheral surface of the silicon steel sheet main body 11, a shaft hole 112 is formed in the middle of the silicon steel sheet main body 11, the motor rotor 10 is required to be injection molded in an injection molding mode to form a structure shown in fig. 3-5, and the magnets 12 and part of the silicon steel sheet main body 11 are coated by an injection molding layer 13. In the injection molding process, since the magnet 12 is embedded in the magnet groove of the silicon steel sheet main body 11, that is to say, the magnet is in an unfixed state, the magnet is extruded by injection molding materials in the injection molding process, the problem of dislocation of the magnet movement easily occurs, the motor rotor after injection molding becomes a defective product, in addition, the injection molding production is batch production, and the rapid positioning of the motor rotor also determines the efficiency of the injection molding production. For this reason, this department needs to develop a set of injection mold for the motor rotor 10 to solve the problem of motor rotor injection molding.

Disclosure of Invention

The utility model aims to provide a motor rotor injection mould which aims to solve the problem of movement dislocation of a strong magnet in an injection molding process.

In order to solve the technical problems, the aim of the utility model is realized as follows:

an injection mold for motor rotor, which comprises a silicon steel sheet main body and a plurality of magnets embedded in the silicon steel sheet main body, comprises

The upper die comprises an injection runner, a first upper die core and a second upper die core;

the lower die comprises a lower die core, a lower die core and a middle ejector rod; the first upper die core, the second upper die core, the lower die core and the lower die core enclose a motor rotor accommodating cavity, and the middle ejector rod is positioned in the center of the motor rotor accommodating cavity; the lower mold core is provided with a first positioning rod and a second positioning rod, and the first positioning rod corresponds to the positioning concave arranged on the silicon steel sheet main body one by one; the second positioning rods are in one-to-one correspondence with the magnets; the motor rotor is received behind the motor rotor accommodation chamber, motor rotor's shaft hole cover is located on the well ejector pin, just the indent card of location is gone into the upper positioning end of reference column, the up end of second locating lever with the lower terminal surface contact of magnet.

The above-mentioned scheme is based on and is a preferable scheme of the above-mentioned scheme: the upper end of the ejector rod penetrates through the lower mold core from bottom to top, and the upper end face of the ejector rod is a set distance from the lower end face of the magnet.

The above-mentioned scheme is based on and is a preferable scheme of the above-mentioned scheme: the lower mold core is provided with a channel for the ejector rod to penetrate through, and the ejector rod can movably penetrate through the channel from the lower part of the lower mold core, so that the upper end part of the ejector rod is contacted with the lower end surface of the magnet after being higher than the lowest surface of the lower mold core by a set distance.

The above-mentioned scheme is based on and is a preferable scheme of the above-mentioned scheme: the ejection assembly comprises a first top plate, the first top plate is contacted with the lower end of the ejector rod, and the ejector rod is driven to push upwards under the action of external force.

The above-mentioned scheme is based on and is a preferable scheme of the above-mentioned scheme: the novel plastic mold further comprises a second top plate, a plurality of mounting holes are formed in the second top plate, the ejector rods penetrate into the lower mold core after penetrating through the mounting holes, and the first top plate is located below the second top plate.

The above-mentioned scheme is based on and is a preferable scheme of the above-mentioned scheme: the lower die core is sleeved outside the lower die core, and the lower die core is movable relative to the lower die core.

The above-mentioned scheme is based on and is a preferable scheme of the above-mentioned scheme: the ejection assembly comprises a lower mold core ejection assembly, and the lower mold core ejection assembly comprises a mold core cover plate, a disc spring and a disc spring guide post; the mold core cover plate is fixedly arranged at the lower end of the lower mold core; the disc spring is sleeved outside the disc spring guide post, the upper end of the disc spring is contacted with the end face, far away from the lower die core, of the die core cover plate, and the lower end of the disc spring is contacted with the fixed post; and after the upper die and the lower die are matched, the lower die core is pressed down, so that the lower die core moves down to compress the disc spring.

Compared with the prior art, the utility model has the following outstanding and beneficial technical effects: the middle ejector rod is arranged in the center of the motor rotor accommodating cavity; the lower mold core is provided with positioning rods which are in one-to-one correspondence with positioning pits arranged on the silicon steel sheet main body; after the motor rotor is received in the motor rotor accommodating cavity, a shaft hole of the motor rotor is sleeved on the middle ejector rod, and the positioning concave is clamped into the upper positioning end of the positioning rod; the first step of positioning is realized through the shaft holes of the middle ejector rod and the silicon steel sheet main body, so that the motor rotor and the motor rotor accommodating cavity are coaxial, and meanwhile, as the magnets on the motor rotor are alternately arranged, the accurate position requirement exists during injection molding, and the positioning requirement can be quickly realized after the upper end of the positioning rod is embedded into the positioning concave of the silicon steel sheet main body through the arrangement of the positioning rod of the lower mold core, so that the production efficiency is improved; and the setting includes a plurality of ejector pins through setting up ejecting subassembly to get into motor rotor holding intracavity and magnet contact after the upper end of ejector pin passes down the mold core from bottom to top, be equivalent to holding magnet from the magnet lower extreme, thereby solved the magnet and moved the problem that leads to the defective products of moulding plastics at the in-process of moulding plastics.

Drawings

FIG. 1 is a front elevational view of the overall structure of a motor rotor blank;

FIG. 2 is a perspective view of the overall structure of the motor rotor blank;

FIG. 3 is a front elevational view of the overall structure of the finished motor rotor;

FIG. 4 is a perspective view of the overall structure of the finished motor rotor;

FIG. 5 is a D-D sectional view of FIG. 3;

FIG. 6 is a perspective view of the overall structure of the present utility model;

FIG. 7 is a front elevational view of the overall structure of the present utility model;

FIG. 8 is a top view of the overall structure of the present utility model;

FIG. 9 is a cross-sectional view A-A of FIG. 8;

fig. 10 is a partial enlarged view E in fig. 9;

FIG. 11 is a schematic perspective view of the internal structure of the mold;

FIG. 12 is a schematic view of the internal part of the mold;

FIG. 13 is a sectional view B-B in FIG. 12;

FIG. 14 is a top view of the mold inner section structure;

FIG. 15 is a C-C cross-sectional view of FIG. 14;

FIG. 16 is a schematic view of the mating structure of the lower core, lower insert and ejector pin;

FIG. 17 is a schematic view of the lower core, post, and ram positions;

FIG. 18 is a schematic view of a second upper mold core structure;

fig. 19 is a schematic perspective view of a second upper mold core structure.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings in the embodiments, and it is apparent that the described embodiments are only some embodiments of the present utility model, but not all embodiments. All other embodiments, based on the examples given, which a person of ordinary skill in the art would obtain without making any inventive effort, are within the scope of the utility model.

In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated.

As shown in fig. 1-2, a motor rotor 10 includes a silicon steel sheet main body 11 and a plurality of magnets 12 embedded in the silicon steel sheet main body 11, a gap 111 is provided between the outermost peripheral surface of the magnets 12 and the outermost peripheral surface of the silicon steel sheet main body 11, a shaft hole 112 is provided in the middle of the silicon steel sheet main body 11, the motor rotor 10 needs to be injection molded in an injection molding manner to form a structure as shown in fig. 3-5, and the magnets 12 and a part of the silicon steel sheet main body 11 are coated by an injection molding layer 13 to obtain a motor rotor finished product as shown in fig. 3-5, and the utility model discloses a motor rotor injection molding die in combination with fig. 6-19, which comprises

Referring to fig. 9, the upper mold 20 includes a first mold body 21, a second mold body 22 and a third mold body 23 from top to bottom, the first mold body 21, the second mold body 22 and the third mold body 23 are fixedly connected through bolts, a first flow channel 211 and a second flow channel 221 are formed in the first mold body 21 and the second mold body 22, a first upper mold core 24 and a second upper mold core 25 are further formed in the first mold body 21, the second mold body 22 and the third mold body 23, and a third flow channel 241 is formed in the first upper mold core 24, so that an injection flow channel is formed by splicing the first flow channel 211, the second flow channel 221 and the third flow channel 241, and a channel is provided for injection fluid in the injection molding process.

The lower die 30, the lower die 30 includes a first lower die main body 32, a second lower die main body 33, a third lower die main body 34, a lower die core 36, a lower die core 35 and a middle ejector rod 37, the first lower die main body 32, the second lower die main body 33 and the third lower die main body 34 are connected through a plurality of bolts, the lower die core 36 and the lower die core 35 are positioned in the lower die main body, and the middle ejector rod 37 is fixedly arranged on the lower die core 35; the motor rotor accommodating cavity 39 is enclosed by the first upper die core 24, the second upper die core 25, the lower die core 36 and the lower die core 35, and the injection runner penetrates through the first upper die core 24 and the second upper die core 25 and then is communicated with the motor rotor accommodating cavity 39, so that injection molding materials can be filled into the motor rotor accommodating cavity 39 in the injection molding process, and injection molding is realized; further, in the present embodiment, the middle ejector 37 is preferably located at the center of the motor rotor accommodating chamber 39; preferably, the lower mold core 35 is provided with a first positioning rod 352 and a second positioning rod 353, and the first positioning rod 352 corresponds to the positioning concave 113 arranged on the silicon steel sheet main body 11 one by one; the second positioning rods 353 are in one-to-one correspondence with the magnets 12; after the motor rotor 10 is received in the motor rotor accommodating cavity 39, the shaft hole 112 of the motor rotor 10 is sleeved on the middle ejector rod 37, the positioning concave 113 is clamped into the upper positioning end 352a of the positioning column 352, and the upper end surface 353a of the second positioning rod 353 is contacted with the lower end surface of the magnet 12; after the motor rotor 10 is received in the motor rotor accommodating cavity 39, the shaft hole 112 of the motor rotor 10 is sleeved on the middle ejector rod 37, and the positioning concave 113 is clamped into the upper positioning end 352a of the positioning column 352; through the arrangement, after the motor rotor is received in the motor rotor accommodating cavity 39, the shaft hole 112 of the motor rotor is sleeved on the middle ejector rod 37, the positioning concave 113 is clamped into the upper positioning end of the positioning rod 37, the upper end face 353a of the second positioning rod 353 is in contact with the lower end face of the magnet 12, the magnet is positioned, and the problem of movement of the magnet in the injection molding process is prevented; the first step of positioning is realized through the middle ejector rod 37 and the shaft hole 112 of the silicon steel sheet main body, so that the motor rotor 10 and the motor rotor accommodating cavity 39 are coaxial, meanwhile, the magnets 12 on the motor rotor are alternately arranged, so that the accurate position requirement exists during injection molding, the positioning rod 37 of the lower mold core is arranged, and after the upper end of the positioning rod 37 is embedded into the positioning concave 113 of the silicon steel sheet main body, the position positioning requirement can be rapidly realized, and the production efficiency is improved; in addition, the second upper mold core 25 and the lower mold core 35 are respectively provided with an upper molding cavity 251 and a lower molding cavity 351 which are in one-to-one correspondence with the magnets 12, thereby providing molding space for materials coated outside the silicon steel sheet body 11 and the magnets 12, and the upper molding cavity 251 and the lower molding cavity 351 in the injection molding process.

The ejection assembly 40 is mainly used for ejecting the motor rotor 10 in the electrode rotor accommodating cavity 39 when the upper die 20 and the lower die 30 are separated. In this embodiment, the ejector assembly 40 preferably includes a plurality of ejector pins 43, and the upper end of the ejector pins 43 passes through the lower mold core 35 from bottom to top, and has a set distance from the lower end surface of the magnet 12; specifically, the upper end face 353a of the second positioning rod 353 contacts the lower end face of the magnet 12, and the magnet 12 is lifted up, and the set distance is determined by the distance by which the upper end face of the second positioning rod 353 is higher than the bottom face of the lower molding cavity 351. The lower mold core 35 is provided with a passage through which the ejector rod 43 passes, the ejector rod 43 movably passes through the passage from below the lower mold core 35, and the upper end face 353a of the second positioning rod 353 supports the magnet 12, so that a gap is formed between the upper end 43a of the ejector rod 43 and the lower end face of the magnet 12, and the gap is filled in the injection molding process. To achieve equal heights of the plurality of ejector pins 43, so that the respective magnets 12 are kept at the same positional height; and during ejection, the ejector rod 43 can synchronously eject the motor rotor, so as to avoid deflection of the motor rotor caused by uneven stress, and cause ejection failure, and in this embodiment, the ejection assembly 40 further preferably includes a first top plate 41, the first top plate 41 contacts with the lower end 43b of the ejector rod 43, and drives the ejector rod 43 to eject under the action of external force, thereby solving the above problem. And further preferably further comprises a second top plate 42, a plurality of mounting holes 421 are formed in the second top plate 42, the ejector rods 43 penetrate through the mounting holes 421 and then penetrate into the lower mold core 35, and the first top plate 41 is located below the second top plate 42. It should be noted that, the existing injection molding machine is provided with an ejection power device, and only when the lower mold is designed, the stress positions of the first top plate and the second top plate 42 are adaptively set according to the power output position of the ejection power device of a specific injection molding machine model, so that the injection molding machine can be driven by the ejection power device well, which is not described in detail herein.

In order to smoothly release the motor rotor 10 after the injection molding is completed, it is further preferable in the present embodiment that the lower core 36 is fitted to the outside of the lower core 35, and the lower core 35 is movable with respect to the lower core 36. Specifically, the preferred ejector assembly 40 includes a lower core ejector assembly 45, the lower core ejector assembly 45 including a core cover 451, a disc spring 452, and a disc spring guide 453; the mold core cover plate 451 is fixedly arranged at the lower end of the lower mold core 35; the disc spring 452 is sleeved outside the disc spring guide post 453, the upper end of the disc spring 452 is contacted with the end surface of the mold core cover plate 451 away from the lower mold core 35, and the lower end of the disc spring 452 is contacted with the fixed post 44; after the upper mold 20 and the lower mold 30 are closed, the lower mold core 35 is pressed down, so that the lower mold core 35 moves down to compress the disc spring 452. Referring to fig. 18-19 in detail, by alternately arranging the protrusions 252 on the upper mold core 25, wherein the protrusions 252 are in contact with the silicon steel sheet main body 11 between two adjacent magnets 12, and after the motor rotor is positioned on the lower mold core 35, the upper end surface of the motor rotor is higher than the die-combining surface of the upper mold and the lower mold, so that the motor rotor is lowered through the protrusions 252 of the upper mold core 25 in the process of moving down the upper mold 20, and then the lower mold core 35 and the mold core cover plate 451 are driven to move down, so as to compress the disc spring 452; after the injection molding is finished, the upper mold 20 moves upwards, and the disc springs 452 are restored from the compressed state, so that the mold core cover plate 451 and the lower mold core 35 are pushed to move upwards, and the motor rotor is driven to move upwards, so that the motor rotor is separated from the lower mold by means of synchronous jacking of the ejector rods 43, and the motor rotor is pushed upwards due to the action of the disc springs 452 and is higher than the die-closing surface of the lower mold, so that a worker or a mechanical arm can conveniently grasp the motor rotor, the motor rotor is quickly taken out from the lower mold, and then the next motor rotor is quickly put into the injection molding operation, and the production efficiency is improved.

The above embodiments are only preferred embodiments of the present utility model, and are not intended to limit the scope of the present utility model in this way, therefore: all equivalent changes in structure, shape and principle of the utility model should be covered in the scope of protection of the utility model.

Claims (7)

1. The utility model provides a motor rotor injection mould, motor rotor include silicon steel sheet main part (11) and inlay establish with a plurality of magnet (12) on silicon steel sheet main part (11), its characterized in that: comprising

An upper mold (20), wherein the upper mold (20) comprises an injection runner, a first upper mold core (24) and a second upper mold core (25);

the lower die (30), the lower die (30) comprises a lower die core (36), a lower die core (35) and a middle ejector rod (37); the first upper die core (24), the second upper die core (25), the lower die core (36) and the lower die core (35) enclose a motor rotor accommodating cavity (39), and the middle ejector rod (37) is positioned in the center of the motor rotor accommodating cavity (39); the lower mold core (35) is provided with a first positioning rod (352) and a second positioning rod (353), and the first positioning rod (352) corresponds to the positioning concave (113) arranged on the silicon steel sheet main body (11) one by one; the second positioning rods (353) are in one-to-one correspondence with the magnets (12); after the motor rotor (10) is received in the motor rotor accommodating cavity (39), a shaft hole (112) of the motor rotor (10) is sleeved on the middle ejector rod (37), the positioning concave (113) is clamped into the upper positioning end (352 a) of the first positioning rod (352), and the upper end face of the second positioning rod (353) is in contact with the lower end face of the magnet (12).

2. An injection mold for a motor rotor as set forth in claim 1 wherein: the ejector assembly (40) comprises a plurality of ejector rods (43); after the upper end of the ejector rod (43) passes through the lower mold core (35) from bottom to top, the upper end surface of the ejector rod has a set distance with the lower end surface of the magnet (12).

3. An injection mold for a motor rotor as set forth in claim 1 wherein: the lower mold core (35) is provided with a channel for the ejector rod (43) to penetrate through, the ejector rod (43) movably penetrates through the channel from the lower part of the lower mold core (35), so that the upper end part (43 a) of the ejector rod (43) is higher than the lowest surface of the lower mold core (35) by a set distance and then is contacted with the lower end surface of the magnet (12).

4. An electric motor rotor injection mold as set forth in claim 2 wherein: the ejection assembly (40) comprises a first top plate (41), the first top plate (41) is in contact with the lower end of the ejector rod (43), and the ejector rod (43) is driven to push upwards under the action of external force.

5. The motor rotor injection mold of claim 4 wherein: the novel plastic mold further comprises a second top plate (42), wherein a plurality of mounting holes (421) are formed in the second top plate (42), the ejector rods (43) penetrate into the lower mold cores (35) after penetrating through the mounting holes (421), and the first top plate (41) is located below the second top plate (42).

6. An injection mold for a motor rotor as set forth in claim 1 wherein: the lower die core (36) is sleeved outside the lower die core (35), and the lower die core (35) is movable relative to the lower die core (36).

7. The motor rotor injection mold of claim 5, wherein: the ejection assembly (40) comprises a lower mold core ejection assembly (45), and the lower mold core ejection assembly (45) comprises a mold core cover plate (451), a disc spring (452) and a disc spring guide column (453); the mold core cover plate (451) is fixedly arranged at the lower end of the lower mold core (35); the disc spring (452) is sleeved outside the disc spring guide post (453), the upper end of the disc spring is contacted with the end face of the die core cover plate (451) away from the lower die core (35), and the lower end of the disc spring is contacted with the fixed post (44); and after the upper die (20) and the lower die (30) are matched, the lower die core (35) is pressed down, so that the lower die core (35) moves down to compress the disc spring (452).