阅读说明：本技术 一种鼠笼式电机转子压铸模具 (Die-casting die for squirrel-cage motor rotor ) 是由 彭家强 毛漂军 于 2020-06-11 设计创作，主要内容包括：本发明公开了一种鼠笼式电机转子压铸模具,包括下叶模、中模、转子铁芯以及上叶模,中模抱住转子铁芯位于下叶模上,上叶模安装于中模,下叶模、转子铁心与上叶模共同形成型腔(转子笼),鼠笼式电机转子压铸模具还包括平衡柱塞(H132及以下除外)及压板,平衡柱塞设有导流孔,导流孔为锥形,导流孔与型腔连通,压板设有溢流槽以及与溢流槽连通的排气槽,压板固定于上叶模,溢流槽与导流孔连通,排气槽从压板延伸至上叶模外。本申请采用锥孔排气,使型腔内气体容易顺锥孔排出,避免滞留；采用溢流槽构造,将型腔内气体导入溢流槽内,还有两个作用：一是使腔内和腔外形成压力差,腔外压力小,气体不回流；二是使溢出多余铝屑有容纳空间。(The invention discloses a die-casting die for a squirrel-cage motor rotor, which comprises a lower blade die, a middle die, a rotor core and an upper blade die, wherein the middle die embraces the rotor core and is positioned on the lower blade die, the upper blade die is arranged on the middle die, the lower blade die, the rotor core and the upper blade die jointly form a cavity (a rotor cage), the die-casting die for the squirrel-cage motor rotor further comprises a balance plunger (H132 and below are excluded), and a pressing plate, wherein the balance plunger is provided with a flow guide hole which is conical, the flow guide hole is communicated with the cavity, the pressing plate is provided with an overflow groove and an exhaust groove communicated with the overflow groove, the pressing plate is fixed on the upper blade die, the overflow groove is communicated with the flow guide. The taper hole is adopted for exhausting, so that gas in the cavity is easy to exhaust along the taper hole, and retention is avoided; the overflow groove structure is adopted to lead the gas in the cavity into the overflow groove, and the overflow groove structure has two functions: firstly, pressure difference is formed between the inside and the outside of the cavity, the pressure outside the cavity is small, and the gas does not flow back; and secondly, the excessive aluminum scraps overflowing are provided with accommodating spaces.)

1. The utility model provides a squirrel-cage motor rotor die casting die, includes lower leaf mould, well mould, rotor core and goes up the leaf mould, well mould embraces rotor core and is located on the lower leaf mould, go up the leaf mould install in well mould, the lower leaf mould rotor core with go up the leaf mould and form the die cavity jointly, its characterized in that: the die-casting die for the squirrel-cage motor rotor further comprises a balance plunger and a pressing plate, wherein the balance plunger is provided with a flow guide hole, the flow guide hole is conical, the flow guide hole is communicated with the cavity, the pressing plate is provided with an overflow groove and an exhaust groove communicated with the overflow groove, the pressing plate is fixed on the upper blade die, the overflow groove is communicated with the flow guide hole, and the exhaust groove extends out of the upper blade die from the pressing plate.

2. The die-casting die for the squirrel-cage motor rotor as claimed in claim 1, wherein: the flow guide holes comprise a first flow guide hole and a second flow guide hole, the first flow guide hole is communicated with the second flow guide hole, and the second flow guide hole is communicated with the overflow groove.

3. The die-casting die for the squirrel-cage motor rotor as claimed in claim 2, wherein: the first diversion hole is a taper hole.

4. The die-casting die for the squirrel-cage motor rotor as claimed in claim 3, wherein: the taper of the first flow guide hole is 60 degrees, the small diameter of the first flow guide hole is 1.5mm-2mm, and the height of the first flow guide hole is 2 mm.

5. The die-casting die for the squirrel-cage motor rotor as claimed in claim 2, wherein: the second diversion hole is an inverted cone hole.

6. The die-casting die for the squirrel-cage motor rotor as claimed in claim 5, wherein: the taper of the second diversion holes is 30 degrees.

7. The die-casting die for the squirrel-cage motor rotor as claimed in claim 1, wherein: the pressure plate is provided with an exhaust hole which is communicated with the overflow groove, and the exhaust hole is a conical hole.

8. The die-casting die for the squirrel-cage motor rotor as claimed in claim 7, wherein: the upper blade die is provided with a blade cavity, and the exhaust holes are communicated with the blade cavity.

9. The die-casting die for the squirrel-cage motor rotor as claimed in claim 1, wherein: the squirrel-cage motor rotor die-casting die further comprises a pressing frame, wherein the pressing frame is located above the upper blade die and is connected with a die-casting machine into a whole.

10. The die-casting die for the squirrel-cage motor rotor as claimed in claim 9, wherein: the squirrel-cage motor rotor die-casting die further comprises a height adjusting ring, wherein the height adjusting ring is located between the upper blade die and the pressing frame and used for adjusting the stroke height of a die-casting machine, and the height adjusting ring can be cancelled when the die-casting die does not need to be adjusted.

Technical Field

The invention relates to cast aluminum of a motor rotor, in particular to a die-casting die for a squirrel-cage motor rotor.

Background

The squirrel-cage rotor of a common small-sized motor is made of die-cast aluminum, and the squirrel-cage after being cast is required to be compact in interior, small and few in air holes, so that the high dynamic balance precision of the rotor and the good performance of the motor can be guaranteed. One strand of upper blade die of the traditional die-casting die is connected with an upper die plate into a whole, and a plurality of exhaust grooves with the depth of about 0.2-0.5mm are formed on the connection surface of the upper blade die and the upper die plate so as to exhaust gas in a die cavity. Because the speed is too fast during die casting, the molten aluminum is poured into the rotor cage for forming, only a few tenths of seconds, and in the short time, the gas in the cavity is difficult to exhaust, so that a large number of air holes exist in the cast rotor end ring. It brings many hidden troubles to the performance of the motor (including noise, vibration and efficiency). Namely: the noise and vibration exceed the standard, and the efficiency of the motor is reduced. Therefore, the rotor of the small-sized motor adopts a die casting mode, and although the efficiency is high and the labor intensity is low, the rotor guide bars and the end ring air holes are more and are a great problem commonly existing in the motor manufacturing industry at present.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide the squirrel-cage motor rotor die-casting die capable of effectively removing gas in a cavity during die-casting so as to improve the cast aluminum quality of the squirrel-cage rotor.

The purpose of the invention is realized by adopting the following technical scheme:

the die-casting die for the squirrel-cage motor rotor comprises a lower blade die, a middle die, a rotor core and an upper blade die, wherein the middle die embraces the rotor core and is positioned on the lower blade die, the upper blade die is installed on the middle die, the lower blade die, the rotor core and the upper blade die jointly form a cavity, the die-casting die for the squirrel-cage motor rotor further comprises a balance plunger and a pressing plate, the balance plunger is provided with a flow guide hole, the flow guide hole is conical, the flow guide hole is communicated with the cavity, the pressing plate is provided with an overflow groove and an exhaust groove communicated with the overflow groove, the pressing plate is fixed on the upper blade die, the overflow groove is communicated with the flow guide hole, and the exhaust groove extends out of the upper blade die from the pressing plate.

Further, the flow guide holes include a first flow guide hole and a second flow guide hole, the first flow guide hole is communicated with the second flow guide hole, and the second flow guide hole is communicated with the overflow groove.

Further, the first diversion hole is a taper hole.

Further, the taper of the first guide hole is 60 degrees, the small diameter of the first guide hole is 1.5mm-2mm, and the height of the first guide hole is 2 mm.

Further, the second diversion hole is an inverted cone hole.

Further, the taper of the second diversion holes is 30 degrees.

Furthermore, the pressure plate is provided with an exhaust hole which is communicated with the overflow groove, and the exhaust hole is a conical hole.

Further, the upper blade die is provided with a blade cavity, and the exhaust holes are communicated with the blade cavity.

Furthermore, the squirrel-cage motor rotor die-casting die further comprises a pressing frame, wherein the pressing frame is located above the upper blade die and is connected with a die-casting machine into a whole.

Furthermore, the squirrel-cage motor rotor die-casting die further comprises a height adjusting ring, wherein the height adjusting ring is positioned between the upper blade die and the pressing frame and used for adjusting the stroke height of a die-casting machine, and the height adjusting ring can be cancelled when the height adjusting ring is not required to be adjusted.

Compared with the prior art, the die-casting die for the squirrel-cage motor rotor has the following advantages:

(1) the taper hole is adopted for exhausting, so that gas in the cavity is easy to exhaust along the taper hole, and the defect that the air is easy to block by exhausting from the square side gap of the balance plunger in the prior art is avoided.

(2) The overflow groove structure is adopted to lead the gas in the cavity into the overflow groove, and the overflow groove structure has two functions: firstly, pressure difference is formed between the inside and the outside of the cavity, the pressure outside the cavity is small, and the gas does not flow back; and secondly, a small amount of excessive aluminum scraps overflowing out of the aluminum tank have accommodating space.

(3) The mode of canceling the upper template is favorable for timely clearing aluminum scraps, the complex work that fastening screws of the upper template and the leaf die need to be removed when the old die cleans the aluminum scraps in the exhaust holes is avoided, the labor intensity of workers is reduced, and the production efficiency is improved.

Drawings

FIG. 1 is a schematic structural diagram of a squirrel-cage motor rotor die-casting mold of the invention;

FIG. 2 is a cross-sectional view of a die casting mold for the squirrel cage motor rotor of FIG. 1;

FIG. 3 is an enlarged view of the squirrel cage motor rotor die casting mold A of FIG. 1;

FIG. 4 is an enlarged view of the squirrel cage motor rotor die casting mold B of FIG. 1;

fig. 5 is a schematic structural diagram of an upper blade mold of the squirrel-cage motor rotor die-casting mold in fig. 1.

In the figure: 10. a lower leaf mold; 20. a middle mold; 30. a rotor core; 40. mounting a leaf mold; 41. an end ring cavity; 42. a balancing column cavity; 43. balancing the plunger position; 44. the pressing plate is in a concave position; 45. a step of a spigot of the iron core; 46. a middle die positioning surface; 47. a blade cavity; 50. a height adjusting ring; 60. pressing a frame; 70. a cavity; 80. a balance plunger; 81. a first flow guide hole; 82. a second flow guide hole; 90. pressing a plate; 91. an overflow trough; 92. an exhaust hole; 93. an exhaust groove.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present, secured by intervening elements. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When an element is referred to as being "disposed on" another element, it can be directly disposed on the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 to 5, an embodiment of a die-casting mold for a squirrel-cage motor rotor according to the present invention includes a lower blade mold 10, a middle mold 20, a rotor core 30, an upper blade mold 40, a height adjusting ring 50, a pressing frame 60, a balance plunger 80, and a pressing plate 90.

The upper blade die 40 is provided with an end ring cavity 41, a balance column cavity 42, a balance plunger position 43, a pressure plate concave position 44 and a blade cavity 47. The end ring cavity 41 and the blade cavity 47 are communicated with the pressure plate concave position 44 through the pressure plate conical hole 92. The balance column chamber 42 is located below the balance plunger position 43, and communicates with the overflow groove 91 through the first guide hole 81 and the second guide hole 82 in the balance plunger 80. The upper leaf die 40 is also provided with an iron core spigot step 45 and a middle die positioning surface 46. The upper end of the upper blade mold 40 is further provided with an exhaust groove 93, and the exhaust groove 93 extends from the edge of the pressing plate concave 44 to the edge of the upper blade mold 40. The exhaust groove 93 is 8mm-10mm wide and 0.8mm deep. The number of the exhaust grooves 93 is 6 to 8, and the exhaust grooves are uniformly distributed on the upper surface of the upper blade mold 40.

The balance plunger 80 is provided with a flow guide hole which is conical. The tapered bore facilitates the venting of gas from the cavity 70 through the balanced plunger. The guide holes include a first guide hole 81 and a second guide hole 82. The first guide holes 81 and the second guide holes 82 communicate with each other. The taper of the first guide hole 81 is 60 degrees, the small diameter of the first guide hole 81 is 1.5mm-2mm, and the height is 2 mm. The second flow guiding holes 82 are reverse taper holes, and the taper of the second flow guiding holes 82 is 30 degrees

The pressing plate 90 is provided with an overflow groove 91, an exhaust hole 92, and an exhaust groove 93. The vent hole 92 is a tapered hole. The exhaust hole 92 is communicated with the overflow groove 91, and the depth of the overflow groove 91 is 3mm to 4 mm. The overflow groove 91 has an edge communicating with the exhaust groove 93.

When assembling the squirrel-cage motor rotor die-casting die, the rotor core 30 is positioned on the seam allowance step of the lower blade die 10, and the middle die 20 is installed on the lower blade die 10. Rotor core 30 is positioned in middle mold 20 at this time. The middle die positioning surface 46 of the upper leaf die 40 is aligned with the outer cone of the middle die 20, and the core spigot step 45 of the upper leaf die 40 is aligned with the rotor core 30. At this time, the lower blade mold 10, the middle mold 20, and the upper blade mold 40 form the entire mold. A cavity 70 is formed between the whole die and the rotor core 30, and the blade cavity 47 is communicated with the cavity 70. The balance plunger 80 is disposed at the balance plunger position 43, and the pressing plate 90 is embedded in the pressing plate concave position 44. And is fixed to the upper leaf mold 40 by screws. The exhaust holes 92 of the pressure plate 90 communicate with the vane chamber 47 at this time. The vent holes 92 of the pressure plate 90 communicate with the balance post chamber 42. The exhaust hole 92 communicated with the blade cavity 47 is a conical hole with the taper of 60 degrees, the small diameter of 1.5mm-2mm (the size of the small diameter is determined according to the size of the rotor model), and the height of 2 mm. The exhaust grooves 93 on the pressure plate 90 are communicated with the exhaust grooves 93 on the upper leaf mold 40 and are positioned on a straight line. When the pressure frame 60 rises along with the die opening of the die casting machine, the excessive aluminum scraps can be removed, and the exhaust hole 92 cannot be blocked.

The height adjusting ring 50 is mounted on the upper leaf die 40 and positioned between the upper leaf die 40 and the pressing frame 60, is used for adjusting the stroke, shortens the die opening and closing time, and can be cancelled and flexibly applied when the die is higher.

When the squirrel-cage motor rotor die-casting die is used, aluminum water enters the cavity 70 from the bottom of the lower blade die 10, a part of air in the cavity 70 flows in from the conical flow guide hole of the balance plunger 80, a part of air flows in from the pressure plate exhaust hole of the blade cavity 47, and finally the air is guided into the overflow groove 91 and is exhausted through the exhaust groove 93. At this time, due to the existence of the overflow groove 91, a pressure difference is formed between the inside of the cavity 70 and the outside of the cavity 70, the pressure outside the cavity is small, and the gas does not flow back. The aluminum water fills the cavity 70.

Through the design, the squirrel-cage motor rotor die-casting die adopts the taper hole for exhausting, so that gas in the die cavity 70 is easily exhausted along the taper hole, and retention is avoided. The overflow groove 91 structure is adopted to lead the gas in the cavity 70 into the overflow groove 91, and has two functions: firstly, pressure difference is formed between the inside and the outside of the cavity, the pressure outside the cavity is small, and the gas does not flow back; and secondly, the excessive aluminum scraps overflowing are provided with accommodating spaces. The mode of canceling the upper die plate is adopted, namely the lower plane of the pressing frame 60 is adopted to replace the upper die plate, and the gap of the opening and closing die is utilized, so that aluminum scraps can be cleared away in time, the complex work that the old die is disassembled and screws are moved to open the upper die plate for cleaning is avoided, the labor intensity of workers is reduced, and the production efficiency is improved. In fact, the old rotor mold can only clean one batch of rotors after casting at most, and aluminum scraps can be cleaned every time one rotor is cast, so that the exhaust duct is kept smooth. The cast aluminum quality of each rotor of the novel mold is guaranteed. This is not possible with older rotor dies.

The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, variations and modifications can be made without departing from the spirit of the invention, and all equivalent modifications and changes can be made to the above embodiments according to the essential technology of the invention, which falls into the protection scope of the invention.