CN110103381B - Stator coil hot die pressing machine and interval type stator coil hot die pressing process - Google Patents
Stator coil hot die pressing machine and interval type stator coil hot die pressing process Download PDFInfo
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- CN110103381B CN110103381B CN201910265619.8A CN201910265619A CN110103381B CN 110103381 B CN110103381 B CN 110103381B CN 201910265619 A CN201910265619 A CN 201910265619A CN 110103381 B CN110103381 B CN 110103381B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
- B29C43/18—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/56—Compression moulding under special conditions, e.g. vacuum
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/04—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of windings, prior to mounting into machines
- H02K15/0435—Wound windings
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/04—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of windings, prior to mounting into machines
- H02K15/0435—Wound windings
- H02K15/0442—Loop windings
- H02K15/045—Form wound coils
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
- B29C43/18—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles
- B29C2043/181—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles encapsulated
- B29C2043/182—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles encapsulated completely
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/56—Compression moulding under special conditions, e.g. vacuum
- B29C2043/561—Compression moulding under special conditions, e.g. vacuum under vacuum conditions
- B29C2043/563—Compression moulding under special conditions, e.g. vacuum under vacuum conditions combined with mechanical pressure, i.e. mould plates, rams, stampers
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Power Engineering (AREA)
- Manufacture Of Motors, Generators (AREA)
Abstract
The invention relates to the field of hydroelectric machinery, in particular to a stator coil hot die pressing machine and an interval type stator coil hot die pressing process. The device comprises a base, a rack is arranged above the base, a die pressing lower punch is arranged at the bottom of the rack, a die pressing platform is arranged on the upper end face of the die pressing lower punch, a heating block is arranged above the die pressing lower punch, a transverse die pressing device is symmetrically arranged on the left side and the right side of the heating block respectively, a die pressing upper punch is further arranged above the rack, and the die pressing lower punch, the transverse die pressing device and the die pressing upper punch surround the heating block and form a sealed space during working. The invention solves the problems that the coil is easy to generate empty in the hot die pressing process of the stator coil in the prior art, the electrical insulation of the coil is poor, the dielectric loss index is poor and the like, and has the advantages that the residual air in the stator coil can be effectively pumped out, and the phenomenon of empty coil is effectively prevented; the electrical insulation is good, and the dielectric loss index is small; simple process.
Description
Technical Field
The invention relates to the field of hydroelectric machinery, in particular to a stator coil hot die pressing machine and an interval type stator coil hot die pressing process.
Background
When the stator coil of the water turbine generator is manufactured, the stator coil needs to be subjected to insulation treatment, wrapped by using an F-grade mica powder tape, and subjected to hot die pressing and curing to form the stator coil with excellent electrical insulation. According to the traditional concept, the stator coil can not be loosened by any means in the hot die-pressing process, otherwise the outline dimension of the stator coil can be influenced, and meanwhile, epoxy glue can be lost. Therefore, the one-stop hot-pressing process becomes an industry-universal process. However, the process has a major technical defect that the fluidity of epoxy glue in the epoxy mica tape is poor in the whole hot molding process of the coil, air between epoxy mica tape layers is difficult to escape under the compression of a molding tool, cavities are easy to form between insulating layers, and residual moisture air in raw mica exists in the cavities, so that the cavities can influence the insulating quality of the molded coil, certain electrical indexes of the coil are difficult to reach the standard, especially the dielectric loss indexes of the coil are greatly influenced, and the electrical insulating performance of the stator coil manufactured by the process is greatly influenced by weather change.
For example, a manufacturing process of a stator coil of a motor by vacuum pressure dip coating, which is granted under the publication number CN103475174B, in chinese patent literature includes the following steps: after the main insulating layer of the motor bearing coil is wrapped with a little-glue mica tape, the motor stator coil is firstly subjected to a vacuum pressure paint dipping process, air gaps between micas are filled with insulating paint in advance, then hot-die pressing curing at 180-200 ℃ is carried out, then the motor stator coil is embedded into a motor stator slot, after the mica is spliced, secondary hot-die pressing curing at 155 ℃ is carried out, and the time of the secondary hot-die pressing curing is not less than 10 hours. The high-voltage motor stator coil manufactured by vacuum pressure paint dipping has compact insulating layer structure, no air holes, low dielectric loss increment, small local discharge amount and high dielectric breakdown field strength. Although it is subjected to a varnish dipping treatment by a vacuum process before hot molding, it is vacuum-dipped at normal temperature, and an insulating varnish such as epoxy resin at normal temperature has a high viscosity, and the vacuum-dipping at normal temperature cannot completely remove moisture and low molecular substances present therein, and at the same time, it is difficult to flow into every corner of the mica tape due to its poor fluidity, so that there is still a possibility that the coil is empty.
Disclosure of Invention
The invention provides a stator coil hot-pressing machine and an interval type stator coil hot-pressing process, which can effectively prevent coil void, have good electrical insulation and smaller dielectric loss index and the like, and aims to solve the problems that coil void is easily generated in the stator coil hot-pressing process in the prior art, the coil electrical insulation is poor, the dielectric loss index is poor and the like.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the utility model provides a stator coil hot die press, stator coil hot die press include a base, base top be provided with a frame, frame bottom be provided with a mould pressing down and dash, the mould pressing down the punch up end be equipped with a mould pressing platform, be provided with a heating block above that, the heating block about both sides respectively the symmetry be provided with a horizontal mould pressing device, frame top still be provided with a mould pressing upper punch, mould pressing down dash, horizontal mould pressing device and mould pressing upper punch surround the heating block and form a confined space at the during operation.
The stator coil hot die press can perform the cooperative die pressing through the die pressing lower punch, the transverse die pressing device and the die pressing upper punch which are arranged at the upper, lower, left and right positions of the heating block, so that the stator coil has good compactness in all directions, and the phenomenon of coil hollowing is reduced.
Preferably, the die pressing lower punch comprises a lower punch lower cylinder and a lower punch upper cylinder which is arranged above the lower punch lower cylinder and hydraulically linked with the lower punch lower cylinder, the lower punch lower cylinder and the lower punch upper cylinder are fixed on the frame through lower frames arranged on the left side and the right side of the lower punch lower cylinder, a lower core rod is arranged in the middle of the lower punch upper cylinder, and the upper end and the lower end of the lower punch upper cylinder are fixedly connected with the die pressing platform and the lower punch lower cylinder respectively.
The die pressing lower punch pushes the die pressing platform to move up and down through hydraulic communication between the lower punch lower cylinder and the lower punch upper cylinder, so that the upper and lower positions of the die pressing platform can be effectively adjusted, and the die pressing pressure is controlled.
Preferably, the transverse molding device comprises a transverse outer cylinder, a transverse inner cylinder extends towards the inside of the frame and is fixedly connected with the frame through a transverse core rod, and a transverse molding head is arranged at the end part of the transverse inner cylinder.
The transverse die pressing device can generate thrust in the horizontal direction through communication between the transverse outer cylinder and the transverse inner cylinder, and the left transverse die pressing head and the right transverse die pressing head wrap the stator coils, so that pressure is generated.
Preferably, the cross section of the transverse mould pressing head is semicircular, and the transverse mould pressing heads of the left transverse mould pressing device and the right transverse mould pressing device are combined with each other to form a cylindrical structure.
The cross section of the transverse mould pressing head is semicircular, so that the two transverse mould pressing heads can be combined to form a cylindrical structure when in work. Thereby enabling the molding of the entire body of the stator coil.
Preferably, the inner wall of the upper end of the transverse mould pressing head is provided with an air release cavity, the transverse mould pressing head is also provided with a plurality of air release holes, the air release cavity is communicated with the air release holes, and the inner wall of the upper end of the transverse mould pressing head is also provided with an air vent step, and the height of the air vent step is lower than that of the outer wall of the transverse mould pressing head.
Stator coil is comparatively sticky because the epoxy in the mica sticky tape is glued in the mould pressing process, and its air and steam in the mould pressing in-process can't be discharged completely, through setting up gassing chamber and gas release hole, can make in the mould pressing in-process unable exhaust air and vapor can effectual discharge, has reduced the problem of remaining cavity in the stator coil to the effectual compactness that promotes the coil insulating layer, thereby make its insulating properties promote greatly.
Preferably, the upper die comprises an upper die cylinder and an upper lower die cylinder arranged below the upper die cylinder, the upper die cylinder is further provided with an upper frame for fixing the upper die cylinder and the upper lower die cylinder, the upper lower die cylinder comprises an upper core rod, the lower end of the upper core rod is fixedly connected with a longitudinal die head, the longitudinal die head comprises a longitudinal die outer head and a longitudinal die inner head, a vent groove is formed between the longitudinal die outer head and the longitudinal die inner head, and an annular air suction hole is formed in the vent groove.
The die pressing upper punch can drive the longitudinal die pressing head to die press the stator coil through transmission between the upper punch upper cylinder and the lower cylinder of the upper punch upper cylinder, and the gas in the gas discharge cavity of the transverse die pressing head can be effectively discharged due to the gas discharge groove and the annular gas suction hole in the longitudinal die pressing head, so that an insulating layer is more compact, and the insulating property is more excellent.
Preferably, the upper core rod is internally provided with a vent groove, the upper end of the upper core rod is provided with an air exhaust opening, the lower end of the upper core rod is communicated with an annular air exhaust hole air passage, the upper frame of the die stamping upper punch is further provided with a vacuum pump, and the vacuum pump is connected with an air exhaust opening pipeline.
The upper core rod of the invention is provided with the vent groove, which can vacuumize the sealed space formed by the die pressing lower punch, the transverse die pressing device and the die pressing upper punch through a vacuum pump connected with the vent groove through a pipeline, and can effectively discharge the gas in the upper core rod.
Preferably, the heating block comprises a first heating block at the bottom and a second heating block arranged at the center of the upper end of the first heating block, and the diameter of the second heating block is smaller than that of the first heating block.
A hot die-pressing process for interval type stator coils comprises the following steps:
(S.1) temperature rise: sleeving a stator coil to be molded on a heating block of a hot die press, and then raising the temperature until epoxy glue in an insulating layer is molten;
(S.2) preliminary die pressing: starting a transverse die pressing device, carrying out surrounding buckling on transverse die pressing heads in a left die pressing device and a right die pressing device and a stator coil to be die pressed, carrying out transverse die pressing, then starting a die pressing lower punch, aligning a longitudinal die pressing outer punch in a longitudinal die pressing head in the die pressing lower punch to the outer wall of the transverse die pressing head, aligning a longitudinal die pressing inner punch to a circular area formed by combining the two transverse die pressing heads, and carrying out primary die pressing downwards;
(S.3) pressure relief: keeping the mould pressing temperature and unloading the mould pressing pressure for a short time;
(S.4) vacuum die pressing: and (3) molding again, simultaneously starting a vacuum pump (31), vacuumizing a sealed space formed by combining the molding lower punch (3), the transverse molding device (6) and the molding upper punch (7), keeping the pressure for a certain time after discharging residual air in the insulating layer, and then cooling to obtain the stator coil with the insulating layer without a cavity and good compactness.
According to the stator coil hot-molding process, firstly, the stator coil to be molded is heated, the epoxy glue is melted, the epoxy glue is subjected to primary molding, a part of air in the insulating layer is discharged, the insulating layer is more compact, then, pressure relief treatment is carried out, the epoxy glue is free to flow, the residual air in the insulating layer is not restrained by a grinding tool and can escape, then, the stator coil is molded again, meanwhile, a vacuum pump is started to pump vacuum, and the residual trace air in the insulating layer is pumped out, so that the purpose that the insulating layer is compact and has no residual air is achieved.
Preferably, the temperature of the heating block in the steps (S.1) - (S.4) is 185-200 ℃, the compression pressure in the step (S.2) is 1-5 MPa, the compression time is 30 minutes, the pressure relief time in the step is 15 minutes, the compression pressure in the step (S.4) is 10-16 MPa, the pressure maintaining time is 1-5 hours, and then the temperature is reduced to 65-80 ℃ for demolding to obtain the stator coil.
The temperature of the heating block is kept between 185 ℃ and 200 ℃ all the time, the flowability of epoxy glue can be effectively guaranteed, meanwhile, the pressure in primary mould pressing is small, the mould pressing time is short, gas with large volume in the insulating layer can be pressed out, so that primary exhaust is carried out, then the insulating layer is mould pressed through large pressure and long time after pressure relief, so that the insulating layer is effectively solidified, and the stator coil with good electrical insulation is obtained.
Therefore, the invention has the following beneficial effects: (1) residual air in the stator coil can be effectively pumped out, and the phenomenon of coil emptying is effectively prevented; (2) the electrical insulation is good, and the dielectric loss index is small; (3) the process is simple.
Drawings
FIG. 1 is a schematic diagram of a structure of the present invention.
Fig. 2 is an enlarged view of a portion a of fig. 1.
Fig. 3 is a bottom view of the longitudinal embossing head of the present invention.
Fig. 4 is a schematic view of a portion of the structure of the die punch of the present invention.
Wherein: the device comprises a base 1, a frame 2, a lower die stamping 3, a die stamping platform 4, a heating block 5, a transverse die stamping device 6, an upper die stamping 7, a lower die stamping lower cylinder 8, a lower die stamping upper cylinder 9, a lower frame 10, a lower core rod 11, a transverse outer cylinder 12, a transverse inner cylinder 13, a transverse core rod 14, a transverse frame 15, a transverse die stamping head 16, an air release cavity 17, an air release hole 18, an air release step 19, an upper die stamping upper cylinder 20, an upper die stamping lower cylinder 21, an upper frame 22, a longitudinal die stamping head 23, a longitudinal die stamping outer head 24, a longitudinal die stamping inner head 25, an air release groove 26, an annular air release hole 27, an upper core rod 28, an air release groove 29, an air release hole 30, a vacuum pump 31, a first heating block 32 and.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Example 1
Referring to fig. 1 to 4, a stator coil hot die press, the stator coil hot die press includes a base 1, a frame 2 is disposed above the base 1, a die pressing lower punch 3 is disposed at the bottom of the frame 2, a die pressing platform 4 is disposed on the upper end face of the die pressing lower punch 3, a heating block 5 is disposed above the die pressing lower punch 3, a transverse die pressing device 6 is symmetrically disposed on each of the left and right sides of the heating block 5, a die pressing upper punch 7 is further disposed above the frame 2, and the die pressing lower punch 3, the transverse die pressing device 6 and the die pressing upper punch 7 surround the heating block 5 and form a sealed space during operation.
The die pressing lower punch 3 comprises a lower punch lower cylinder 8 and a lower punch upper cylinder 9 which is arranged above the lower punch lower cylinder 8 and hydraulically linked with the lower punch lower cylinder 8, the lower punch lower cylinder 8 and the lower punch upper cylinder 9 are fixed on the frame 2 through lower frames 10 arranged on the left side and the right side of the lower punch lower cylinder, a lower core rod 11 is arranged in the middle of the lower punch upper cylinder 9, and the upper end and the lower end of the lower punch upper cylinder are respectively fixedly connected with the die pressing platform 4 and the lower punch lower cylinder 8.
The transverse molding device 6 comprises a transverse outer cylinder 12, a transverse inner cylinder 13 extends towards the inside of the rack 2 and is fixedly connected with the transverse outer cylinder through a transverse core rod 14 and a transverse frame 15, a transverse molding head 16 is arranged at the end part of the transverse inner cylinder 13, the cross section of the transverse molding head 16 is semicircular, and the transverse molding heads 16 of the left transverse molding device 6 and the transverse molding device 16 of the right transverse molding device 6 are combined with each other to form a cylindrical structure. The inner wall of the upper end of the transverse mould pressing head 16 is provided with an air release cavity 17, the transverse mould pressing head 16 is also provided with a plurality of air release holes 18, the air release cavity 17 is communicated with the air release holes 18, and the inner wall of the upper end of the transverse mould pressing head 16 is also provided with an air vent step 19, and the height of the upper end of the air vent step is lower than that of the outer wall of the transverse mould pressing head 16.
The upper die stamping punch 7 comprises an upper die upper cylinder 20 and an upper die lower cylinder 21 arranged below the upper die upper cylinder 20, an upper frame 22 for fixing the upper die upper cylinder 20 and the upper die lower cylinder 21 is further arranged on the upper die stamping punch 7, the upper die lower cylinder 21 comprises an upper core rod 28, the lower end of the upper core rod is fixedly connected with a longitudinal die stamping head 23, the longitudinal die stamping head 23 comprises a longitudinal die stamping outer head 24 and a longitudinal die stamping inner head 25, an air release groove 26 is formed between the longitudinal die stamping outer head and the longitudinal die stamping inner head 25, an annular air suction hole 27 is formed in the air release groove 26, a vent groove 29 is formed in the upper core rod 28, the upper end of the upper core rod is provided with an air suction opening 30, the lower end of the upper core rod is communicated with the annular air suction hole 27, a vacuum pump 31 is further arranged on the upper frame 22 of the upper die stamping.
The heating block 5 comprises a first heating block 32 at the bottom and a second heating block 33 arranged at the center of the upper end of the first heating block 32, and the diameter of the second heating block 33 is smaller than that of the first heating block 32.
Example 2
A hot die-pressing process for interval type stator coils comprises the following steps:
s.1, temperature rising: sleeving a stator coil to be molded on a heating block 5 of a hot die press, and then raising the temperature to 185-200 ℃ to melt epoxy glue in an insulating layer;
s.2, primary die pressing: starting the transverse die pressing device 6, carrying out surrounding buckling on transverse die pressing heads 16 in the left die pressing device 6 and the right die pressing device 6 and a stator coil to be die pressed, carrying out transverse die pressing, then starting the die pressing lower punch 3, aligning a longitudinal die pressing outer head 24 in a longitudinal die pressing head 23 of the die pressing lower punch 3 to the outer wall of the transverse die pressing head 16, aligning a longitudinal die pressing inner head 25 to a circular area formed by combining the two transverse die pressing heads 16, and carrying out primary die pressing downwards, wherein the die pressing pressure is 1-5 MPa, and the die pressing time is 30 minutes;
s.3, pressure relief: keeping the mould pressing temperature, and briefly unloading the mould pressing pressure for 15 minutes;
s.4, vacuum die pressing: and (3) performing mould pressing again, wherein the mould pressing pressure is 10-16 MPa, simultaneously starting a vacuum pump 31, vacuumizing a sealed space formed by combining the lower mould pressing punch 3, the transverse mould pressing device 6 and the mould pressing punch 7, keeping the pressure for 1-5 hours after discharging residual air in the insulating layer, cooling to 65-80 ℃, and demoulding to obtain the stator coil with the insulating layer, no cavity and good compactness.
Claims (9)
1. A stator coil hot die press comprises a base (1), wherein a rack (2) is arranged above the base (1), and the stator coil hot die press is characterized in that a die pressing lower punch (3) is arranged at the bottom of the rack (2), a die pressing platform (4) is arranged on the upper end face of the die pressing lower punch (3), a heating block (5) is arranged above the die pressing lower punch, transverse die pressing devices (6) are symmetrically arranged on the left side and the right side of the heating block (5) respectively, a die pressing upper punch (7) is arranged above the rack (2), and the die pressing lower punch (3), the transverse die pressing devices (6) and the die pressing upper punch (7) surround the heating block (5) and form a sealed space when working;
the transverse mould pressing device (6) comprises a transverse outer cylinder (12), a transverse inner cylinder (13) extends towards the inside of the rack (2), and a transverse mould pressing head (16) is arranged at the end part of the transverse inner cylinder (13);
the inner wall of the upper end of the transverse mould pressing head (16) is provided with an air release cavity (17), the transverse mould pressing head (16) is also provided with a plurality of air release holes (18), the air release cavity (17) is communicated with the air release holes (18), and the inner wall of the upper end of the transverse mould pressing head (16) is also provided with an air vent step (19) of which the height is lower than that of the outer wall of the transverse mould pressing head (16).
2. The stator coil hot die press as claimed in claim 1, wherein the die pressing lower punch (3) comprises a lower punch lower cylinder (8) and a lower punch upper cylinder (9) disposed above and hydraulically linked to the lower punch lower cylinder (8), the lower punch lower cylinder (8) and the lower punch upper cylinder (9) are fixed to the frame (2) by lower frames (10) disposed at left and right sides of the lower punch lower cylinder, a lower core rod (11) is disposed at a middle portion of the lower punch upper cylinder (9), and upper and lower ends of the lower punch upper cylinder are respectively fixedly connected to the die pressing platform (4) and the lower punch lower cylinder (8).
3. A stator coil hot die press as claimed in claim 1, wherein the transverse outer cylinder (12) and the transverse inner cylinder (13) are fixedly connected to each other by a transverse core rod (14) and a transverse frame (15).
4. The stator coil hot embossing machine as claimed in claim 1, characterized in that said transverse embossing heads (16) have a semicircular cross-section, and the transverse embossing heads (16) of the left and right transverse embossing devices (6) are combined with each other to form a cylindrical structure.
5. The stator coil hot die press as claimed in claim 1, wherein the die stamping upper punch (7) comprises an upper punch cylinder (20) and an upper lower punch cylinder (21) arranged below the upper punch cylinder, the die stamping upper punch (7) is further provided with an upper frame (22) for fixing the upper punch cylinder (20) and the upper lower punch cylinder (21), the upper punch cylinder (21) comprises an upper core rod (28), the lower end of the upper punch cylinder is fixedly connected with a longitudinal die stamping head (23), the longitudinal die stamping head (23) comprises a longitudinal die stamping outer head (24) and a longitudinal die stamping inner head (25), a vent groove (26) is formed between the upper punch cylinder and the upper die stamping lower cylinder, and an annular vent hole (27) is formed in the vent groove (26).
6. A stator coil hot die press as claimed in claim 5, wherein said upper core rod (28) has a vent groove (29) formed therein, an air suction opening (30) formed at an upper end thereof, and an air passage communicating with the annular air suction hole (27) at a lower end thereof, and a vacuum pump (31) is further provided on the upper frame (22) of said upper die punch (7), said vacuum pump (31) being connected to the air suction opening (30) by a pipe.
7. The stator coil hot die press as claimed in claim 1, wherein said heating block (5) comprises a first heating block (32) at the bottom, and a second heating block (33) provided at the center of the upper end of the first heating block (32), said second heating block (33) having a diameter smaller than that of the first heating block (32).
8. The interval type stator coil hot die pressing process is characterized by comprising the following steps of:
(S.1) temperature rise: sleeving a stator coil to be molded on a heating block (5) of a hot die press, and then raising the temperature until epoxy glue in an insulating layer is molten;
(S.2) preliminary die pressing: starting a transverse die pressing device (6), carrying out surrounding buckling on transverse die pressing heads (16) in a left die pressing device and a right die pressing device (6) and a stator coil to be die pressed, carrying out transverse die pressing, then starting a die pressing lower punch (3), aligning a longitudinal die pressing outer punch (24) in a longitudinal die pressing head (23) of the die pressing lower punch (3) to the outer wall of the transverse die pressing head (16), aligning a longitudinal die pressing inner punch (25) to a circular area formed by combining the two transverse die pressing heads (16), and carrying out primary die pressing downwards;
(S.3) pressure relief: keeping the mould pressing temperature and unloading the mould pressing pressure for a short time;
(S.4) vacuum die pressing: and (3) molding again, simultaneously starting a vacuum pump (31), vacuumizing a sealed space formed by combining the molding lower punch (3), the transverse molding device (6) and the molding upper punch (7), keeping the pressure for a certain time after discharging residual air in the insulating layer, and then cooling to obtain the stator coil with the insulating layer without a cavity and good compactness.
9. The interval type stator coil hot molding process according to claim 8, wherein the temperature of the heating block (5) in the steps (S.1) - (S.4) is 185-200 ℃, the molding pressure in the step (S.2) is 1-5 MPa, the molding time is 30 minutes, the pressure relief time in the step (S.3) is 15 minutes, the molding pressure in the step (S.4) is 10-16 MPa, and the temperature is reduced to 65-80 ℃ after the pressure maintaining time is 1-5 hours, so as to obtain the stator coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910265619.8A CN110103381B (en) | 2019-04-03 | 2019-04-03 | Stator coil hot die pressing machine and interval type stator coil hot die pressing process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910265619.8A CN110103381B (en) | 2019-04-03 | 2019-04-03 | Stator coil hot die pressing machine and interval type stator coil hot die pressing process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110103381A CN110103381A (en) | 2019-08-09 |
| CN110103381B true CN110103381B (en) | 2021-06-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910265619.8A Active CN110103381B (en) | 2019-04-03 | 2019-04-03 | Stator coil hot die pressing machine and interval type stator coil hot die pressing process |
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| CN101436558A (en) * | 2007-11-16 | 2009-05-20 | 东和株式会社 | Method of compression-molding electronic components and mold |
| CN103475174A (en) * | 2013-08-07 | 2013-12-25 | 杭州富阳水电设备检测有限公司 | Manufacturing process for manufacturing motor stator coil through vacuum-pressure paint dipping |
| WO2017179398A1 (en) * | 2016-04-13 | 2017-10-19 | 黒田精工株式会社 | Manufacturing device and manufacturing method of magnet embedded core |
| CN209731018U (en) * | 2019-04-03 | 2019-12-03 | 杭州富春江水电设备有限公司 | A kind of stator coil extrusion press |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101436558A (en) * | 2007-11-16 | 2009-05-20 | 东和株式会社 | Method of compression-molding electronic components and mold |
| CN103475174A (en) * | 2013-08-07 | 2013-12-25 | 杭州富阳水电设备检测有限公司 | Manufacturing process for manufacturing motor stator coil through vacuum-pressure paint dipping |
| WO2017179398A1 (en) * | 2016-04-13 | 2017-10-19 | 黒田精工株式会社 | Manufacturing device and manufacturing method of magnet embedded core |
| CN209731018U (en) * | 2019-04-03 | 2019-12-03 | 杭州富春江水电设备有限公司 | A kind of stator coil extrusion press |
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