CN114433815A - Motor rotor squirrel cage low-pressure copper casting equipment and copper casting method thereof - Google Patents
Motor rotor squirrel cage low-pressure copper casting equipment and copper casting method thereof Download PDFInfo
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- CN114433815A CN114433815A CN202210083721.8A CN202210083721A CN114433815A CN 114433815 A CN114433815 A CN 114433815A CN 202210083721 A CN202210083721 A CN 202210083721A CN 114433815 A CN114433815 A CN 114433815A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/04—Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/08—Controlling, supervising, e.g. for safety reasons
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Abstract
The invention belongs to the technical field of metal casting, and particularly relates to a low-pressure copper casting device and a copper casting method for a squirrel cage of a motor rotor, wherein the low-pressure copper casting device comprises a shell, a liquid inlet unit, a space control unit and a die unit; the die unit comprises a bottom plate, a central column, a clamping plate and a top cover; the bottom plate is fixedly connected to the bottom of the shell, a first groove is formed in the upper portion of the bottom plate, and the liquid inlet is communicated with the bottom plate; the central column is fixedly connected with the central part of the bottom plate; the upper part of the bottom plate is uniformly provided with a plurality of clamping plates, the clamping plates surround the central column, the clamping plates are provided with baffle plates, cavities are arranged at the positions corresponding to the baffle plates, a plurality of extrusion blocks are uniformly arranged at the inner arc parts of the clamping plates, the end parts of the extrusion blocks are arc-shaped, the baffle plates are connected with the cavities in a sliding mode, and the baffle plates and the cavities are arc-shaped; the upper part of the central column is slidably connected with the top cover.
Description
Technical Field
The invention relates to the technical field of metal casting, in particular to low-pressure copper casting equipment for a squirrel cage of a motor rotor and a copper casting method thereof.
Background
In the traditional motor rotor manufacturing process, a plurality of superposed rotor silicon steel sheets are fixed by ribs in a rotor guide groove, or cast aluminum is used for replacing the ribs to fix the rotor. However, since the rotor manufactured by using cast aluminum has low motor efficiency and no manufacturing process with good other materials, cast copper has the defects of empty nest, underfill and the like, and cannot be applied to practice.
The invention also relates to a low-pressure copper casting device of a motor rotor squirrel cage and a copper casting method thereof in the prior art, for example, a Chinese patent with the application number of CN201721316635.8 discloses a low-pressure copper casting device of a motor rotor squirrel cage, which comprises a copper melting furnace, a rotor copper casting mold and a casting press provided with a mold, wherein a pressurizing furnace is arranged between the copper melting furnace and the casting press, the copper melting furnace is connected with the pressurizing furnace through a deoxidizing pipeline, a connecting part of the deoxidizing pipeline and the pressurizing furnace is provided with a vacuum gate, the pressurizing furnace is connected to the pressurizing device through a flowing liquid channel, the flowing liquid channel is provided with a vacuum device, a conducting agent feeding device and a mixing device are arranged between the mold and the flowing liquid channel, and the low-pressure copper casting device of the motor rotor squirrel cage is provided with a controller; the flow of the copper liquid can be well controlled, the control precision of copper casting can be improved, the waste of the copper liquid 11a is reduced, and the yield of products is improved. The invention can improve the production efficiency, reduce the labor intensity, ensure the insulation effect among the silicon steel sheets, more importantly improve the conductive efficiency of the rotor 10 ribs and further improve the service efficiency of the motor. However, the above patent still has the defect that the mold is not designed for exhausting the inside of the mold, and although air is extracted from the mold part during the use process, residual gas is still extruded into the mold when molten copper is extruded into the mold, so that the molten copper cannot be completely filled in the mold during the casting process, and the casting effect is adversely affected.
In view of the above, the present invention provides a low-pressure copper casting apparatus for a squirrel cage of a motor rotor and a copper casting method thereof, so as to solve the above technical problems.
Disclosure of Invention
In order to make up the defects of the prior art, the problems that the empty nest and the incomplete casting can occur in the casting process of the existing low-pressure copper casting equipment for the squirrel cage of the motor rotor, the yield of the low-pressure copper casting of the squirrel cage of the motor rotor is low, the casting efficiency is low, and further the production efficiency of the chromium-free tin plate is influenced are solved.
The technical scheme adopted by the invention for solving the technical problems is as follows: the invention discloses a copper casting method for a squirrel cage of a motor rotor, which comprises the following steps:
s1: heating the copper melting chamber to melt solid copper into a molten state, then filling low-pressure compressed gas with the pressure of 0.06-0.15 MPa into the copper melting chamber through the air inlet, and gradually filling copper water from the bottom of the bottom plate to the top of the extrusion block along with the accumulation of the gas on the upper part of the copper melting chamber; at the moment, the top cover is not pressed by the clamping plate and is tightly attached to cause sealing, so that air in the die cavity is gradually ejected out of the upper part of the die cavity by molten copper;
s2: the telescopic rod gradually extends out to enable the clamping block to extrude the clamping plate under the driving of the telescopic rod, so that the clamping plate extrudes the space in the die cavity, and the space is gradually reduced; meanwhile, the conditions that the mold cavity is not filled and air exists inside the mold cavity due to poor copper water fluidity are damaged; and these air are expelled from the upper part of the mold cavity, which has not been sealed temporarily, under the pressure of the clamping plates; meanwhile, the outer side wall surface of the top cover is completely attached to the inner side wall surface of the clamping plate to form sealing; discharging air from the casting to form a sealed casting environment;
s3: the baffle arranged on the clamping plate gradually moves into the cavity in the clamping plate, namely the guide rod gradually moves; because the upper surface of the guide rod is obliquely arranged, the sliding rod is gradually jacked up along with the gradual movement of the guide rod; the upper end of the sliding rod rises along with the gradual jacking of the sliding rod, and the top cover is pressed downwards under the action of the first rod;
s4: the middle part of the sliding rod is a piston plate, the sealing performance of the inside of the cavity is strong, and the upward pressure applied to the sliding rod is gradually increased along with the increase of the pressure; the end part of the sliding rod is forced upwards under the action of pressure; the top cover is subjected to a larger force under the action of the first rod to further extrude the molten copper, so that the extrusion effect is enhanced; and taking out the casting for polishing after the casting is finished.
The low-pressure copper casting equipment for the squirrel cage of the motor rotor is suitable for the copper casting method and comprises a shell, a liquid inlet unit, a space control unit and a die unit; the liquid inlet unit comprises a copper melting chamber, an air inlet and a liquid outlet; the copper melting chamber is fixedly connected to the lower part of the shell, and a heating device is arranged in the copper melting chamber; the air inlet is fixedly connected with and penetrates through the right side wall surface of the copper melting chamber and is communicated with the outside; the space control unit comprises telescopic rods and clamping blocks, the telescopic rods are fixedly connected to the two side wall surfaces of the shell, the clamping blocks are fixedly connected to the end portions of the telescopic rods, and the clamping blocks are arc-shaped plates; the die unit comprises a bottom plate, a central column, a clamping plate and a top cover; the bottom plate is fixedly connected to the bottom of the shell, a first groove is formed in the upper portion of the bottom plate, and the liquid outlet penetrates through the first groove; the central column is fixedly connected with the central part of the bottom plate; the upper part of the bottom plate is connected with a plurality of clamping plates in a sliding manner, the clamping plates are fixedly connected with the baffle plates, cavities are arranged at the corresponding parts of the baffle plates of two adjacent clamping plates, and the end parts of the baffle plates extend into the cavities; the surface of the clamping plate close to the central column is uniformly provided with a plurality of extrusion blocks, the end surface of each extrusion block close to the central column is arc-shaped, the baffle is in sliding connection with the cavity, and the baffle and the cavity are both arc-shaped; the upper part of the central column is slidably connected with the top cover.
During work, the copper melting chamber is heated to melt solid metal copper into a molten state, then low-pressure compressed gas with the pressure of 0.06-0.15 MPa is filled through the air inlet, along with the accumulation of the gas on the upper part of the copper melting chamber, copper water in the extrusion copper melting chamber enters a die cavity surrounded by the clamping plate and the baffle through the liquid outlet, and the copper water is gradually filled to the top of the extrusion block from the bottom of the bottom plate; in the process, the clamping block is not completely extruded by the telescopic rod, so that the top cover is not extruded by the clamping plate and is tightly attached to cause the inside of the die cavity to be sealed, and therefore air in the die cavity is gradually ejected out of the upper part of the die cavity by the molten copper; air in the die cavity is reduced; the casting is ensured not to have empty nest due to the residual air inside; simultaneously, the mold cavity is gradually filled with molten copper; the telescopic rod gradually extends out, so that the clamping block extrudes the clamping plate under the driving of the telescopic rod, and the clamping plate extrudes the space in the die cavity, so that the space is gradually reduced; the condition that the mold cavity is not filled with the molten copper due to poor fluidity of the molten copper is damaged, so that air exists in the mold cavity; this air is expelled from the upper part of the mold cavity, which has not been sealed temporarily, under the pressure of the clamping plates; the end part of the extrusion block at the inner side of the clamping plate gradually approaches to the central column along with the continuous movement of the telescopic rod, and finally is completely attached to the surface of the central column, and meanwhile, the outer side wall surface of the top cover is also completely attached to the inner side wall surface of the clamping plate to form sealing; the mold cavity is vented of the interior atmosphere and a sealed casting environment is created.
Preferably, the baffle is fixedly connected with a guide rod on the side wall in the cavity, the upper surface of the guide rod is obliquely arranged, a through hole penetrating through the clamping plate is formed in the upper part of the clamping plate, and a sliding rod is slidably connected in the through hole; the lower tip and the guide bar upper end sliding connection of slide bar, the slide bar upper end is rotated with the one end of a pole and is connected, the other end and the top cap sliding connection of a pole, a pole middle part is rotated with the fore-set and is connected, the fore-set links firmly at the splint upper surface.
When the copper water filling machine works, when the mold cavity is filled with copper water, the lower end part of the sliding rod is contacted with the upper end part of the guide rod, and the clamping block extrudes the clamping plate to approach the central column along with the driving of the telescopic rod; the baffle arranged on the clamping plate gradually moves into the cavity in the clamping plate, namely the guide rod gradually moves; because the upper surface of the guide rod is obliquely arranged, the sliding rod is gradually jacked up along with the gradual movement of the guide rod; the upper end of the sliding rod rises along with the gradual jacking of the sliding rod, namely the connecting part of the first rod and the upper end of the sliding rod rises, so that the top cover is pressed downwards under the action of the other end of the first rod; the copper water in the die cavity is further compressed, so that the air in the die cavity is further reduced, and the casting is prevented from being empty and not filled with the copper water.
Preferably, the pressure of the space inside the cavity is higher; and a piston plate is arranged in the middle of the sliding rod.
When the clamping plate works, the baffle plate gradually moves towards the inner part of the cavity when the clamping plate gradually approaches the central column, and gradually moves towards the inner part of the cavity along with the baffle plate; the pressure in the cavity is gradually increased, and because the piston plate is arranged in the middle of the sliding rod, the sealing property in the cavity is strong, and the upward force applied to the sliding rod is gradually increased along with the increase of the pressure; subjecting the end of the sliding rod to an upward force; the top cover is subjected to a larger force under the action of the first rod, so that the copper water is further extruded, the extrusion effect is enhanced, and the casting is further prevented from being empty and not filled with the copper water.
Preferably, the first rod part of the connecting part of the sliding rod and the top column is long, and the first rod part of the connecting part of the top cover and the top column is short.
When the lifting device works, the sliding rod is gradually jacked up along with the movement between the guide rod and the sliding rod, the part of the jacking column, which is rotationally connected with the first rod, is used as a fulcrum along with the gradual jacking of the sliding rod, and the first rod gradually inclines; the end of the top cover is forced downwards along with the rising of the sliding rod; and increases as the height of the sliding rod gradually increases; the longer the first rod between the sliding rod and the top column, the larger force can be applied to the top cover under the same height change of the sliding rod, the extrusion effect is further strengthened, and the casting is further prevented from being empty and not filled.
Preferably, the liquid outlet passes through the first groove, and the part of the liquid outlet in the bottom plate is obliquely arranged.
When the device works, the copper water is filled into the die cavity, so that cold shut caused by too fast rolling due to too high flow rate is prevented; therefore, the low-pressure compressed gas with the pressure of 0.06-0.15 MPa is filled in the copper melting chamber, so that the pressure for extruding the copper water is lower; the flow rate of filling the copper water into the die cavity is small; however, a small flow velocity may generate a hollow nest due to poor fluidity of the copper water, and the oblique arrangement of the liquid outlet enhances the flow of the copper water on the horizontal plane, which is beneficial to reducing the occurrence of cavities in the casting.
Preferably, the lower end part of the wall surface in the cavity corresponding to the movement of the baffle is arc-shaped, and the lower end part of the through hole is conical.
When the device works, the baffle gradually moves towards the inner part of the cavity along with the baffle; the baffle presses air in the cavity, and the lower end part of the wall surface of the cavity corresponding to the movement of the baffle is arc-shaped, so that the resistance of air circulation is reduced, the fluidity of air in the cavity is increased, and the air in the cavity can enter the through hole more easily; meanwhile, the lower end of the through hole is designed to be conical, so that more air can conveniently flow into the through hole and act on the lower part of the piston plate, the piston plate is ensured to be subjected to higher pressure, the extrusion effect is further enhanced, and the casting is further prevented from being empty and not filled with the air.
The invention has the following beneficial effects:
1. according to the low-pressure copper casting equipment and the low-pressure copper casting method for the squirrel cage of the motor rotor, the telescopic rod extends out, so that the clamping block extrudes the clamping plate under the driving of the telescopic rod, the clamping plate extrudes the space in the die cavity, and the space of the die cavity is gradually reduced; and at the same time, the situation that the copper water is not filled with air inside due to poor fluidity is destroyed, and the air is discharged from the upper part of the mold cavity which is not sealed temporarily by the pressing of the clamping plate.
2. The invention relates to a low-pressure copper casting device and a copper casting method for a squirrel cage of a motor rotor, which are characterized in that a guide rod gradually moves; the sliding rod is gradually jacked up; the upper end of the sliding rod rises along with the gradual jacking of the sliding rod, and the top cover is pressed downwards under the action of the first rod; the copper water is further compressed, the air in the die cavity is further reduced, and the casting is ensured not to have empty nest and be not filled with the copper water.
Drawings
The invention is further described below with reference to the accompanying drawings;
FIG. 1 is a method flow diagram of a treatment process in the present invention;
FIG. 2 is a perspective view of a low pressure copper casting apparatus according to the present invention;
FIG. 3 is a cross-sectional view of the de-molding unit of FIG. 2;
FIG. 4 is a detail view of the clamp plate of the present invention;
FIG. 5 is a cross-sectional view of the splint of FIG. 4;
FIG. 6 is an enlarged view of a portion of FIG. 2 at A;
FIG. 7 is a partial enlarged view at B in FIG. 5;
FIG. 8 is a cross-sectional view of a base plate according to the present invention;
in the figure: the device comprises a shell 1, a liquid inlet unit 2, a copper melting chamber 21, an air inlet 22, a liquid outlet 23, a space control unit 3, an expansion rod 31, a clamping block 32, a mold unit 4, a bottom plate 41, a first groove 411, a central column 42, a clamping plate 43, a baffle 431, a cavity 432, a through hole 433, an extrusion block 434, a guide rod 435, a sliding rod 436, a top column 437, a first rod 438, a piston plate 439, a top cover 44 and a mold cavity 45.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
As shown in fig. 1 to 8, the method for casting copper in a squirrel cage of a motor rotor of the invention comprises the following steps:
s1: the copper melting chamber 21 is heated to melt solid copper into a molten state, then low-pressure compressed gas with the pressure of 0.15-0.6MPa is filled in through the gas inlet 22, and as the gas is accumulated on the upper part of the copper melting chamber, copper water is gradually filled from the bottom of the bottom plate 41 to the top of the extrusion block 434; at this time, the top cover 44 is not pressed and tightly sealed by the clamping plate 43, so that the air inside the mold cavity 45 is gradually ejected from the upper part of the mold cavity 45 by the molten copper;
s2: the telescopic rod 31 gradually extends out to enable the clamping block 32 to extrude the clamping plate 43 under the driving of the telescopic rod 31, so that the clamping plate 43 extrudes the space in the die cavity 45, and the space is gradually reduced; and simultaneously the conditions that the mold cavity 45 is not filled and air exists inside the mold cavity due to poor copper water fluidity are damaged; and this air is expelled from the upper part of the mold cavity 45, which has not been sealed temporarily, under the pressure of the clamping plate 43; meanwhile, the outer side wall surface of the top cover 44 is completely attached to the inner side wall surface of the clamping plate 43 to form sealing; discharging air from the casting to form a sealed casting environment;
s3: the baffle 431 provided on the clamping plate 43 gradually moves into the cavity 432 inside the clamping plate 43, i.e., the guide bar 435 gradually moves; since the upper surface of the guide bar 435 is disposed obliquely, the sliding bar 436 is gradually jacked up as the guide bar 435 is gradually moved; as the sliding bar 436 is gradually lifted up, the upper end of the sliding bar 436 rises, and the top cover 44 is pressed downward by the first lever 438;
s4: the middle part of the sliding rod 436 is a piston plate 439, the inside of the cavity 432 is highly sealed, and the upward pressure applied to the sliding rod 436 gradually increases with the increase of the pressure; the end of the sliding rod 436 is forced upward by the pressure; under the action of the first rod 438, the top cover 44 is subjected to a larger force to further extrude the molten copper, so that the extrusion effect is enhanced; and taking out the casting for polishing after the casting is finished.
The low-pressure copper casting equipment for the squirrel cage of the motor rotor is suitable for the copper casting method and comprises a shell 1, a liquid inlet unit 2, a space control unit 3 and a die unit 4; the liquid inlet unit 2 comprises a copper melting chamber 21, a gas inlet 22 and a liquid outlet 23; the copper melting chamber 21 is fixedly connected to the lower part of the shell 1, and a heating device is arranged in the copper melting chamber 21; the air inlet 22 is fixedly connected with and penetrates through the right side wall surface of the copper melting chamber 21, and the air inlet 22 is communicated with an external air source; the space control unit 3 comprises an expansion link 31 and a clamping block 32, the expansion link 31 is fixedly connected with two side wall surfaces of the shell 1, the clamping block 32 is fixedly connected with the end part of the expansion link 31, and the clamping block 32 is an arc-shaped plate; the mold unit 4 includes a bottom plate 41, a center post 42, a clamp plate 43, and a top cover 44; the bottom plate 41 is fixedly connected to the bottom of the shell 1, an annular first groove 411 is formed in the upper portion of the bottom plate 41, the liquid outlet 23 is located on the upper surface of the bottom plate 41 and communicated with the interior of the copper melting chamber 21, and the liquid outlet 23 is communicated with the first groove 411; the central column 42 is fixedly connected to the central part of the bottom plate 41; a plurality of clamping plates 43 are slidably connected to the upper part of the bottom plate 41, the clamping plates 43 are annularly distributed on the upper surface of the bottom plate 41, a cavity 432 is formed in a position, corresponding to the baffle 431, where one end of each clamping plate 43 is fixedly connected with the baffle 431 and the other end of each clamping plate 431 is fixedly connected with the baffle 431, and the end of each baffle 431 extends into the cavity 432 of the adjacent clamping plate 43; the baffle 431 is slidably connected with a cavity 432 of the adjacent clamping plate 43, and the baffle 431 and the cavity 432 are both arc-shaped; the area between the clamp plate 43, the stop 431 and the center post 42 is the mold cavity 45; a plurality of extruding blocks 434 are uniformly arranged on the surface of the clamping plate 43 close to the central column 42, the end surfaces of the extruding blocks 434 close to the central column 42 are arc-shaped, and the upper part of the central column 42 is slidably connected with the top cover 44.
During work, the copper melting chamber 21 is heated to melt solid metal copper into a molten state, then low-pressure compressed gas with the pressure of 0.06-0.15 MPa is filled through the air inlet 22, along with the accumulation of the gas on the upper part of the copper melting chamber 21, copper water in the extruded copper melting chamber 21 enters the die cavity 45 surrounded by the clamping plate 43 and the baffle 431 through the liquid outlet 23, and the copper water is gradually filled to the top of the extrusion block 434 from the bottom of the bottom plate 41; in the process, the clamping block 32 is not completely pressed by the telescopic rod 31, so the top cover 44 is not pressed by the clamping plate 43 and is tightly attached to cause the inside of the mold cavity 45 to be sealed, and therefore, the air in the mold cavity 45 is gradually ejected out of the upper part of the mold cavity 45 by the molten copper; reducing air within the mold cavity 45; the casting is ensured not to have empty nest due to the residual air inside; meanwhile, as the mold cavity 45 is gradually filled with the molten copper, the telescopic rod 31 gradually extends out, so that the clamping block 32 is driven by the telescopic rod 31 to extrude the clamping plate 43, and the clamping plate 43 extrudes the space in the mold cavity 45, so that the space is gradually reduced; because the molten copper in the die cavity 45 is uniformly pressed, the flowability of the molten copper in the die cavity 45 is enhanced, the molten copper is ensured to be fully filled in the die cavity 45, the air is discharged from the gap between the top cover 44 and the clamping plate 43 which are not completely sealed temporarily under the extrusion of the clamping plate 43, and the situation that the die cavity 45 is not filled due to poor flowability of the molten copper, so that empty nests are caused, and the forming quality is influenced is avoided; with the continuous movement of the telescopic rod 31, the end part of the extrusion block 434 inside the clamping plate 43 is gradually close to the central column 42, and finally completely attached to the surface of the central column 42, so as to divide the inside of the mold cavity 45 into a plurality of disconnected regions, and simultaneously, the outer side wall surface of the top cover 44 is also completely attached to the inner side wall surface of the clamping plate 43 to form a seal, so that the mold cavity 45 discharges the air inside and forms a sealed casting environment, and then the disconnected regions formed by the gaps of the copper extrusion blocks 434 are cooled and formed to form copper bars in annular distribution, and finally, a motor rotor squirrel cage cast copper part is obtained under the connection of the copper rings formed by the first groove 411 and the top cover 44.
As a specific embodiment of the present invention, the baffle 431 is fixedly connected to the guide rod 435 on the side wall inside the cavity 432, the upper surface of the guide rod 435 is obliquely arranged, the upper portion of the clamping plate 43 is provided with a through hole 433 penetrating through the clamping plate 43, and a sliding rod 436 is slidably connected inside the through hole 433; the lower end of the sliding bar 436 contacts the upper surface of the guide bar 435; a through hole 433 extends out of the top of the sliding rod 436, a top pillar 437 is fixedly connected to one side, close to the top cover 44, of the upper surface of the clamping plate 43, and a first rod 438 is rotatably connected to the top of the top pillar 437; one end of the first rod 438 is inserted into a groove formed at the upper end of the sliding rod 436, and the other end is in contact with the top cover 44.
When the copper water is about to fill the mold cavity 45 in operation, the lower end part of the sliding rod 436 is in contact with the upper end part of the guide rod 435, and the clamping block 32 is extruded by the clamping block 32 to approach the central column 42 along with the telescopic rod 31 driving the clamping block 32; the baffle 431 arranged on the clamping plate 43 gradually moves towards the cavity 432 inside the clamping plate 43, namely the guide rod 435 gradually moves towards the deep cavity 432; because the upper surface of the guide bar 435 is obliquely arranged and the bottom of the sliding bar 436 is in contact with the upper surface of the guide bar 435, the sliding bar 436 is gradually jacked up and moved upwards under the action of the inclined surface on the guide bar 435 as the guide bar 435 is gradually moved deeply; as the sliding rod 436 is gradually lifted up, the upper end of the sliding rod 436 presses the end of the first rod 438 in contact therewith, so that the first rod 438 rotates, and thus the end of the first rod 438 in contact with the top cover 44 rotates downward, so that the top cover 44 is pressed downward by the downward movement of the end of the first rod 438 in contact therewith; because the first rods 438 are distributed annularly, the top cover 44 is uniformly stressed to move downwards, so that the copper water in the mold cavity 45 is further compressed, the air in the mold cavity 45 is further reduced, and the finally formed copper casting is prevented from being empty and not filled.
As a specific embodiment of the present invention, the middle of the sliding rod 436 is fixedly connected with a piston plate 439, the outer wall of the piston plate 439 is closely attached to the inner wall of the through hole 433, and the diameter of the sliding rod 436 at the lower part of the piston plate 439 is smaller than the diameter of the through hole 433.
In operation, when the clamping plate 43 gradually approaches the central column 42, the baffle 431 gradually moves towards the inside of the cavity 432, as the baffle 431 gradually moves towards the inside of the cavity 432, air inside the cavity 432 is pressurized and flows downwards to enter the through hole 433, the lower part of the sliding rod 436 has a smaller diameter, therefore, air flowing into the through hole 433 accumulates in a gap between the lower part of the piston plate 439 and the side wall of the through hole 433 on the sliding rod 436, so that the air pressure in the area is increased, the sealing performance inside the cavity 432 is strong, as the air pressure is increased, the piston plate 439 is pushed upwards, and the sliding rod 436 is subjected to an upwards force under the action of the piston plate 439, so that the sliding rod 436 is further stressed and presses the end part of the first rod 438 in contact; thus, under the action of the first rod 438, the top cover 44 is further stressed, so that the molten copper is further squeezed, the squeezing effect is enhanced, and the castings are further prevented from being empty and unfilled.
In one embodiment of the present invention, the distance between the end of the sliding rod 436 and the end of the top post 437 is greater than the distance between the end of the top post 437 and the top surface of the top cover 44.
In operation, the sliding rod 436 is gradually jacked up along with the movement between the guide rod 435 and the sliding rod 436, and the first rod 438 gradually inclines along with the gradual jacking of the sliding rod 436 and the position where the top column 437 is rotatably connected with the first rod 438 as a fulcrum; as the sliding bar 436 rises, the end of the top cover 44 is forced downward and increases as the height of the sliding bar 436 gradually rises; because the first rod 438 between the sliding rod 436 and the top column 437 is longer in length, the first rod 438 plays a role of the first rod 438 along with the rotation of the first rod 438, and according to the principle of the first rod 438, the pressure applied by the first rod 438 to the top cover 44 is greater than the supporting force applied by the sliding rod 436 to the first rod 438, so that the top cover 44 further plays a role in squeezing the molten copper in the mold cavity 45, and the castings are further prevented from being empty and unfilled.
As a specific embodiment of the present invention, the liquid outlet 23 penetrates through the first groove 411, and a portion of the liquid outlet 23 inside the bottom plate 41 is obliquely disposed.
When the device works, the copper water is filled into the die cavity 45, so that cold shut caused by too fast rolling due to too high flow rate is prevented; therefore, the copper melting chamber 21 is filled with low-pressure compressed gas with the pressure of 0.06-0.15 MPa, so that the pressure for extruding the copper water is lower; the flow rate of filling the copper water into the mold cavity 45 is small; but the casting may be empty because of the poor fluidity of the copper water at a low flow rate, and the flow rate of the copper water in the horizontal direction is increased due to the oblique arrangement of the liquid outlet 23, so that the fluidity of the copper water in the mold cavity 45 is enhanced, the empty nests of the casting are reduced, and the quality of the casting is further improved.
In an embodiment of the present invention, a lower end portion of a wall surface of the cavity 432 corresponding to the movement of the baffle 431 is formed in an arc shape, and a lower end portion of the through hole 433 is formed in a conical shape.
In operation, as the baffle 431 gradually moves towards the interior of the cavity 432; the baffle 431 extrudes the air in the cavity 432, the lower end part of the wall surface of the cavity 432 corresponding to the movement of the baffle 431 is arranged to be arc-shaped, the resistance of air circulation is reduced, the air flowing downwards is accelerated to enter the through hole 433, and the air pressure resistance when the baffle 431 enters the cavity 432 is reduced; meanwhile, the lower end of the through hole 433 is conical, so that more air is accelerated to flow into the through hole 433 and act on the lower part of the piston plate 439, the piston plate 439 is ensured to be subjected to higher pressure, the extrusion effect is further enhanced, and the casting is further prevented from being empty and not filled.
The specific working process is as follows:
during work, the copper melting chamber 21 is heated to melt solid metal copper into a molten state, then low-pressure compressed gas with the pressure of 0.06-0.15 MPa is filled through the air inlet 22, and copper water is gradually filled from the bottom of the bottom plate 41 to the top of the extrusion block 434; the cap 44 is not compressed and snug by the clamping plate 43 resulting in a seal at this time; the telescopic rod 31 gradually extends out to enable the clamping plate 43 to extrude the clamping plate 43 under the driving of the telescopic rod 31, so that the clamping plate 43 extrudes the space in the die cavity 45, and the space is gradually reduced; as the telescopic rod 31 continues to move, the end of the extrusion block 434 on the inner side of the clamping plate 43 gradually approaches the central column 42, and finally completely fits with the surface of the central column 42, and meanwhile, the outer side wall surface of the top cover 44 also completely fits with the inner side wall surface of the clamping plate 43 to form a seal; and when the baffle 431 arranged on the clamping plate 43 gradually moves towards the cavity 432 inside the clamping plate 43, namely the guide rod 435 gradually moves; because the thickness of the end part of the guide rod 435 is small and the thickness of the part connected with the baffle 431 is large, the sliding rod 436 is gradually jacked up along with the gradual movement of the guide rod 435; as the slide bar 436 is gradually lifted up, the upper end of the slide bar 436 rises, and the top cover 44 is pressed downward by the first rod 438 to press the space in the mold cavity 45; and taking out the casting for polishing after the rotor squirrel cage is completely molded.
The front, the back, the left, the right, the upper and the lower are all based on figure 2 in the attached drawings of the specification, according to the standard of the observation angle of a person, the side of the device facing an observer is defined as the front, the left side of the observer is defined as the left, and so on.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the scope of the present invention.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. A low-pressure copper casting method for a squirrel cage of a motor rotor is characterized by comprising the following steps: the low-pressure copper casting method comprises the following steps:
s1: the copper melting chamber (21) is heated to melt solid copper into a molten state, then low-pressure compressed gas with the pressure of 0.06-0.15 MPa is filled in through the air inlet (22), and as the gas is accumulated on the upper part of the copper melting chamber, copper water is gradually filled to the top of the extrusion block (434) from the bottom of the bottom plate (41); at the moment, the top cover (44) is not pressed by the clamping plate (43) and is tightly attached to cause sealing, so that air inside the die cavity (45) is gradually ejected out of the upper part of the die cavity (45) by molten copper;
s2: the telescopic rod (31) gradually extends out to enable the clamping block (32) to extrude the clamping plate (43) under the driving of the telescopic rod (31), so that the clamping plate (43) extrudes the space in the die cavity (45) and the space is gradually reduced; meanwhile, the conditions that the mold cavity (45) is not filled and air exists inside the mold cavity due to poor copper water fluidity are damaged; and these air are expelled from the upper part of the mold cavity (45) which has not been sealed temporarily, under the pressure of the clamping plate (43); meanwhile, the outer side wall surface of the top cover (44) is completely attached to the inner side wall surface of the clamping plate (43) to form sealing; discharging air from the casting to form a sealed casting environment;
s3: the baffle (431) arranged on the clamping plate (43) gradually moves into the cavity (432) in the clamping plate (43), namely the guide rod (435) gradually moves; because the upper surface of the guide rod (435) is obliquely arranged, the sliding rod (436) is gradually jacked up along with the gradual movement of the guide rod (435); as the sliding rod (436) is gradually jacked up, the upper end part of the sliding rod (436) rises, and the top cover (44) is subjected to downward pressure under the action of the first rod (438);
s4: the middle part of the sliding rod (436) is a piston plate (439), the inside of the cavity (432) has strong sealing performance, and the upward pressure applied to the sliding rod (436) is gradually increased along with the increase of the pressure; subjecting the end of the sliding rod (436) to an upward force under the action of the pressure; under the action of the first rod (438), the top cover (44) is subjected to a larger force to further extrude molten copper, so that the extrusion effect is enhanced; and taking out the casting for polishing after the casting is finished.
2. The utility model provides a motor rotor squirrel cage low pressure copper casting equipment which characterized in that: the low-pressure copper casting equipment for the squirrel cage of the motor rotor is suitable for the copper casting method, and comprises a shell (1), a liquid inlet unit (2), a space control unit (3) and a die unit (4); the liquid inlet unit (2) comprises a copper melting chamber (21), an air inlet (22) and a liquid outlet (23); the copper melting chamber (21) is fixedly connected to the lower part of the shell (1), and a heating device is arranged in the copper melting chamber (21); the air inlet (22) is fixedly connected and penetrates through the right side wall surface of the copper melting chamber (21), and the air inlet (22) is communicated with an external air source; the space control unit (3) comprises a telescopic rod (31) and clamping blocks (32), the telescopic rod (31) is fixedly connected to two side wall surfaces of the shell (1), the clamping blocks (32) are fixedly connected to the end portions of the telescopic rod (31), and the clamping blocks (32) are arc-shaped plates; the mould unit (4) comprises a bottom plate (41), a central column (42), a clamping plate (43) and a top cover (44); the bottom plate (41) is fixedly connected to the bottom of the shell (1), an annular first groove (411) is formed in the upper portion of the bottom plate (41), the liquid outlet (23) is located on the upper surface of the bottom plate (41) and communicated with the interior of the copper melting chamber (21), and the liquid outlet (23) is communicated with the first groove (411); the central column (42) is fixedly connected to the central part of the bottom plate (41); the upper part of the bottom plate (41) is connected with a plurality of clamping plates (43) in a sliding mode, the clamping plates (43) are distributed on the upper surface of the bottom plate (41) in a ring mode, one end of each clamping plate (43) is fixedly connected with a baffle (431), a cavity (432) is formed in the position, corresponding to the baffle (431), of the other end of each clamping plate (43), and the end part of each baffle (431) extends into the cavity (432) of the adjacent clamping plate (43); the baffle (431) is in sliding connection with a cavity (432) of an adjacent clamping plate (43), and the baffle (431) and the cavity (432) are both arc-shaped; the area between the clamping plate (43), the baffle (431) and the central column (42) is a mould cavity (45); the surface of the clamping plate (43) close to the central column (42) is uniformly provided with a plurality of extrusion blocks (434), the end surface of each extrusion block (434) close to the central column (42) is arc-shaped, and the upper part of the central column (42) is connected with the top cover (44) in a sliding manner.
3. The motor rotor squirrel-cage low-pressure copper casting equipment as claimed in claim 2, characterized in that: the side wall of the baffle (431) in the cavity (432) is fixedly connected with a guide rod (435), the upper surface of the guide rod (435) is obliquely arranged, a through hole (433) penetrating through the clamping plate (43) is formed in the upper part of the clamping plate (43), and a sliding rod (436) is connected in the through hole (433) in a sliding manner; the lower end of the sliding rod (436) is in contact with the upper surface of the guide rod (435); a through hole (433) extends out of the top of the sliding rod (436), one side, close to the top cover (44), of the upper surface of the clamping plate (43) is fixedly connected with a top column (437), and the top of the top column (437) is rotatably connected with a first rod (438); one end of the first rod (438) is embedded into a groove arranged at the upper end of the sliding rod (436), and the other end of the first rod is in contact with the top cover (44).
4. The motor rotor squirrel cage low pressure copper casting apparatus of claim 3, wherein: the middle part of the sliding rod (436) is fixedly connected with a piston plate (439), the outer wall of the piston plate (439) is tightly attached to the inner wall of the through hole (433), and the diameter of the part of the sliding rod (436) positioned at the lower part of the piston plate (439) is smaller than that of the through hole (433).
5. The motor rotor squirrel cage low pressure copper casting apparatus of claim 4, wherein: the distance between the end part of the sliding rod (436) and the end part of the top column (437) is larger than the distance between the end part of the top column (437) and the upper surface of the top cover (44).
6. The motor rotor squirrel cage low pressure copper casting apparatus of claim 5, wherein: the liquid outlet (23) runs through the first groove (411), and the part of the liquid outlet (23) inside the bottom plate (41) is obliquely arranged.
7. The motor rotor squirrel cage low pressure copper casting apparatus of claim 6, wherein: the lower end part of the wall surface in the cavity (432) corresponding to the movement of the baffle (431) is arc-shaped, and the lower end part of the through hole (433) is conical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210083721.8A CN114433815A (en) | 2022-01-21 | 2022-01-21 | Motor rotor squirrel cage low-pressure copper casting equipment and copper casting method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210083721.8A CN114433815A (en) | 2022-01-21 | 2022-01-21 | Motor rotor squirrel cage low-pressure copper casting equipment and copper casting method thereof |
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| CN114433815A true CN114433815A (en) | 2022-05-06 |
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| CN202210083721.8A Pending CN114433815A (en) | 2022-01-21 | 2022-01-21 | Motor rotor squirrel cage low-pressure copper casting equipment and copper casting method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114951602A (en) * | 2022-05-11 | 2022-08-30 | 刘金全 | A low-pressure copper casting equipment for motor rotor squirrel cage |
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| CN207239132U (en) * | 2017-10-13 | 2018-04-17 | 安阳恒安电机有限公司 | A kind of squirrel cage motor rotor low pressure cast copper equipment |
| CN111390119A (en) * | 2020-03-20 | 2020-07-10 | 淮南巧天机械设备技术有限公司 | Investment casting mold core |
| CN111515365A (en) * | 2020-04-24 | 2020-08-11 | 朱永全 | Motor rotor squirrel cage low-pressure copper casting equipment and copper casting method thereof |
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| CN114951602A (en) * | 2022-05-11 | 2022-08-30 | 刘金全 | A low-pressure copper casting equipment for motor rotor squirrel cage |
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