CN108667232B - Coil stock rod in motor slot wedge molding process and motor slot wedge molding process - Google Patents
Coil stock rod in motor slot wedge molding process and motor slot wedge molding process Download PDFInfo
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- CN108667232B CN108667232B CN201810756216.9A CN201810756216A CN108667232B CN 108667232 B CN108667232 B CN 108667232B CN 201810756216 A CN201810756216 A CN 201810756216A CN 108667232 B CN108667232 B CN 108667232B
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- Prior art keywords
- slot wedge
- molding process
- motor slot
- rubberized
- steps
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Links
- 238000000465 moulding Methods 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 50
- 239000004744 fabric Substances 0.000 claims abstract description 41
- 229920005989 resin Polymers 0.000 claims abstract description 35
- 239000011347 resin Substances 0.000 claims abstract description 35
- 239000000463 material Substances 0.000 claims abstract description 29
- 238000005096 rolling process Methods 0.000 claims abstract description 24
- XQUPVDVFXZDTLT-UHFFFAOYSA-N 1-[4-[[4-(2,5-dioxopyrrol-1-yl)phenyl]methyl]phenyl]pyrrole-2,5-dione Chemical compound O=C1C=CC(=O)N1C(C=C1)=CC=C1CC1=CC=C(N2C(C=CC2=O)=O)C=C1 XQUPVDVFXZDTLT-UHFFFAOYSA-N 0.000 claims abstract description 23
- 229920003192 poly(bis maleimide) Polymers 0.000 claims abstract description 23
- 239000011521 glass Substances 0.000 claims abstract description 20
- 238000003825 pressing Methods 0.000 claims description 32
- 238000010438 heat treatment Methods 0.000 claims description 19
- 238000007731 hot pressing Methods 0.000 claims description 12
- 238000005520 cutting process Methods 0.000 claims description 5
- 238000005516 engineering process Methods 0.000 claims description 2
- 238000004804 winding Methods 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 230000037303 wrinkles Effects 0.000 abstract description 2
- 238000007723 die pressing method Methods 0.000 description 3
- 239000002390 adhesive tape Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 239000003365 glass fiber Substances 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000003137 locomotive effect Effects 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- 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
- H02K15/0018—Applying slot closure means in the core; Manufacture of slot closure means
-
- 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
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/26—Component parts, details or accessories; Auxiliary operations
- B29C51/46—Measuring, controlling or regulating
-
- 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
- B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
- B29C71/02—Thermal after-treatment
Abstract
The invention discloses a coil stock rod in a motor slot wedge molding process and the motor slot wedge molding process, wherein the coil stock rod comprises a cylindrical coil stock rod body, and the diameter phi of the coil stock rod body Rod The formula is satisfied:wherein phi is s The diameter of the circle converted by the perimeter of the section of the slot wedge of the motor is; one end of the winding rod body is provided with a groove for clamping the rubberized glass fabric; the material rolling rod body is connected with a handle. The invention can rapidly determine the optimal diameter of the material winding rod, and determine the optimal molding process parameters corresponding to the rubberized fabrics on the bismaleimide of different materials, and has the advantages of high production efficiency, good apparent quality of the motor slot wedge obtained by molding, no groove, wrinkle or resin edge on the surface, high mechanical strength and good thermal stability.
Description
Technical Field
The invention belongs to the technical field of motor slot wedge molding processes, and particularly relates to a coil rod in a motor slot wedge molding process and the motor slot wedge molding process.
Background
With the continuous development of electric locomotives in China, the performance of locomotive traction motors is higher and higher, so that the requirements on traction motor insulation products are higher and higher. The motor slot wedge is used as an important part for fixing the traction motor coil, and has high mechanical strength and geometric dimension besides corresponding insulation heat resistance level. If the electrode slot wedge has a quality problem, the electrode slot wedge is possibly thrown out by a strong centrifugal force generated by the motor at high temperature and high speed, so that serious consequences of sweeping the motor are caused. From the analysis of the stress state of the slot wedge, the slot wedge is mainly subjected to transverse bending and shearing stress in the working state, and the stress damage parts are mostly concentrated on the angle surfaces on two sides of the slot wedge along the longitudinal direction.
At present, two production processes are available for the motor slot wedge: (1) The plate is ground into the slot wedge, and the motor slot wedge manufactured by the manufacturing process reduces the reinforcing effect of the glass fiber because the transverse glass fiber is ground; (2) The groove wedge is molded, the rubberized glass cloth is wrapped into cylindrical compression molding, the continuity of the transverse fibers of the electrode groove wedge is ensured, and the transverse strength of the groove wedge is enhanced, so that the electrode groove wedge is widely used.
The main technological parameters affecting the mechanical strength of the motor slot wedge manufactured by the mould pressing technology are as follows: (1) diameter of the winding rod; (2) molding pressure; (3) molding temperature; (4) molding time; (5) heat treatment temperature and time.
The impact of the diameter of the coil rod on the die slot wedge is as follows: (1) When the diameter of the material rolling rod is too large, the diameter of a cylinder formed by rolling the rubberized glass fabrics by the material rolling rod is larger, and after the cylinder is placed in a die cavity, grooves or folds are formed on the surface of a slot wedge after die pressing because the circumference of the cylinder is larger than the circumference of the section of the die cavity, as shown in figure 1. (2) When the diameter of the material rolling rod is too small, the diameter of a cylinder formed by rolling the rubberized glass fabrics by the material rolling rod is smaller, and after the cylinder is placed in a die cavity, the circumference of the cylinder is smaller than the circumference of the section of the die cavity, and after die pressing, a resin edge is formed on the angle surface at the side of the slot wedge, so that the transverse bending strength of the slot wedge is seriously affected, as shown in figure 2.
At present, the prior art has less research on the motor slot wedge molding process, namely, the diameter of a coil rod is roughly selected according to working experience, and the molding pressure, the molding temperature, the molding time, the heat treatment temperature and the time are controlled according to experience, so that the motor slot wedge obtained by molding has poor apparent quality, the surface is generally provided with grooves, folds or resin edges, the mechanical strength is low, and the heat stability is poor.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a coil rod in a motor slot wedge molding process and the motor slot wedge molding process, which can rapidly determine the optimal diameter of the coil rod, and determine the optimal molding process parameters corresponding to bismaleimide rubberized fabrics with different materials, and the motor slot wedge molded by the molding process has the advantages of high production efficiency, good apparent quality, no grooves, wrinkles or resin edges on the surface, high mechanical strength and good thermal stability.
In order to solve the technical problems, the invention adopts the following technical scheme:
a material rolling rod in a motor slot wedge mould pressing process comprises a cylindrical material rolling rod body and is structurally characterized in that the diameter phi of the material rolling rod body Rod The formula is satisfied:wherein phi is s To be converted into a circular diameter by the perimeter of the section of the slot wedge of the motor s X pi = motor slot wedge cross section perimeter.
When the diameter of the material rolling rod body meets the formula, the diameter of the material rolling rod body is most suitable, and the surface of the material rolling rod body is free of grooves, folds or resin edges, so that the quality is good. The operator can directly select suitable coil stock stick according to the formula fast, and work efficiency is high.
Further, one end of the winding rod body is provided with a groove for clamping the rubberized glass fabric.
Further, the material rolling rod body is connected with a handle which is convenient to hold.
Preferably, the thickness of the groove is 0.2-0.4 mm.
Based on the same inventive concept, the invention also provides a motor slot wedge molding process, which comprises the following steps:
step one, cutting the rubberized glass cloth into required sizes according to the length and the weight of the slot wedge;
step two, wrapping the rubberized glass fabric into a cylinder by using a material rolling rod;
step three, sequentially pressing, demolding and heat treatment are carried out on the cylinder;
the method is characterized in that in the second step, the rubberized glass fabric is wrapped into a cylinder by using a material rolling rod in the motor slot wedge molding process.
In a preferred mode, in the second step, the rubberized glass fabric is a bismaleimide rubberized fabric.
As a first preferred mode, in the bismaleimide rubberized fabric: volatile content less than or equal to 1.5%, resin content 33% -42%, insoluble resin content less than or equal to 10%; in the third step, the mould pressing time is 8-10 min/mm; the mould pressing temperature is 190-200 ℃; the molding pressure is pressurized to 25+/-5 MPa/cm in three steps 2 The method comprises the steps of carrying out a first treatment on the surface of the Exhausting and hot-pressing after die assembly for 30-50 s; heat treatment is carried out for 3 to 6 hours at 220 ℃.
As a second preferred mode, in the bismaleimide rubberized fabric: volatile content less than or equal to 1.5%, resin content 33-42%, insoluble resin content 10-20%; in the third step, the mould pressing time is 8-10 min/mm; the mould pressing temperature is 190-200 ℃; the molding pressure is pressurized to 25+/-5 MPa/cm in three steps 2 The method comprises the steps of carrying out a first treatment on the surface of the Exhausting and hot-pressing after 20-40 s of die assembly; heat treatment is carried out for 3 to 6 hours at 220 ℃.
As a third preferred mode, in the bismaleimide rubberized fabric: volatile content less than or equal to 1.5%, resin content 30-40%, insoluble resin content 20-30%; in the third step, the mould pressing time is 5-8 min/mm; the mould pressing temperature is 200-210 ℃; the molding pressure is pressurized to 30+/-5 MPa/cm in two steps 2 The method comprises the steps of carrying out a first treatment on the surface of the Exhausting and hot-pressing after die assembly for 10-30 s; heat treatment is carried out for 3 to 6 hours at 220 ℃.
As a fourth preferred mode, in the bismaleimide rubberized fabric: swingThe content of the hair components is less than or equal to 1.5 percent, the content of the resin is 36 percent to 42 percent, and the content of the insoluble resin is 30 percent to 40 percent; in the third step, the mould pressing time is 5-8 min/mm; the mould pressing temperature is 190-210 ℃; the molding pressure is pressurized to 30+/-5 MPa/cm in two steps 2 The method comprises the steps of carrying out a first treatment on the surface of the Exhausting and hot-pressing after die assembly for 5-20 s; heat treatment is carried out for 3 to 6 hours at 220 ℃.
The inventor finds that three indexes of volatile matters, resin content and soluble resin content of the rubberized fabric on the bismaleimide are not isolated but mutually restricted after a large number of process verification, the invention explores the optimal molding process parameters corresponding to the rubberized fabric on the bismaleimide with different materials, the appearance quality of the motor slot wedge obtained by molding is good, the surface has no groove, fold or resin edge, the mechanical strength is high, and the thermal stability is good.
Compared with the prior art, the invention can rapidly determine the optimal diameter of the material winding rod, and determine the optimal molding process parameters corresponding to the rubberized fabrics on the bismaleimide of different materials, and has the advantages of high production efficiency, good apparent quality of the motor slot wedge obtained by molding, no groove, fold or resin edge on the surface, high mechanical strength and good thermal stability.
Drawings
FIG. 1 is a schematic cross-sectional view of a motor slot wedge when the diameter of a coil rod is too large.
FIG. 2 is a schematic cross-sectional view of a motor slot wedge when the diameter of a coil bar is too small.
FIG. 3 is a schematic view of a coil stock rod used in the motor slot wedge molding process of the present invention.
Fig. 4 is a left side view of fig. 3.
Wherein, 1 is a coil bar body, 101 is a groove, and 2 is a handle.
Detailed Description
As shown in fig. 3 and 4, the coil stock in the motor slot wedge molding process includes a cylindrical coil stock body having a diameter Φ Rod The formula is satisfied:wherein phi is s Is converted into a circle by the perimeter of the section of the slot wedge of the motorThe diameter is the section perimeter of the used die cavity. Phi s X pi = motor slot wedge cross section perimeter.
One end of the winding rod body is provided with a groove for clamping the rubberized glass fabric. The ditching groove is cut by a wire, and the thickness of the ditching groove is 0.2-0.4 mm.
The material rolling rod body is connected with a handle.
The invention provides a motor slot wedge molding process, which comprises the following steps:
step one, cutting the rubberized glass cloth into required sizes according to the length and the weight of the slot wedge;
step two, wrapping the rubberized glass fabric into a cylinder by using a material rolling rod;
step three, sequentially pressing, demolding and heat treatment are carried out on the cylinder;
in the second step, the rubberized glass cloth is wrapped into a cylinder by using a material rolling rod in the motor slot wedge die pressing process.
In the second step, the rubberized glass cloth is bismaleimide rubberized fabric.
The molding process parameters corresponding to the bismaleimide upper adhesive tapes with different materials are as follows:
1. in the bismaleimide rubberized fabric: volatile content less than or equal to 1.5%, resin content 33% -42%, insoluble resin content less than or equal to 10%; in the third step, the mould pressing time is 8-10 min/mm; the mould pressing temperature is 190-200 ℃; the molding pressure is pressurized to 25+/-5 MPa/cm in three steps 2 The method comprises the steps of carrying out a first treatment on the surface of the Exhausting and hot-pressing after die assembly for 30-50 s; heat treatment is carried out for 3 to 6 hours at 220 ℃.
2. In the bismaleimide rubberized fabric: volatile content less than or equal to 1.5%, resin content 33-42%, insoluble resin content 10-20%; in the third step, the mould pressing time is 8-10 min/mm; the mould pressing temperature is 190-200 ℃; the molding pressure is pressurized to 25+/-5 MPa/cm in three steps 2 The method comprises the steps of carrying out a first treatment on the surface of the Exhausting and hot-pressing after 20-40 s of die assembly; heat treatment is carried out for 3 to 6 hours at 220 ℃.
3. In the bismaleimide rubberized fabric: volatile matter content less than or equal to 1.5%, resin content 30-40% and insoluble resin content 20%30 percent; in the third step, the mould pressing time is 5-8 min/mm; the mould pressing temperature is 200-210 ℃; the molding pressure is pressurized to 30+/-5 MPa/cm in two steps 2 The method comprises the steps of carrying out a first treatment on the surface of the Exhausting and hot-pressing after die assembly for 10-30 s; heat treatment is carried out for 3 to 6 hours at 220 ℃.
4. In the bismaleimide rubberized fabric: volatile content less than or equal to 1.5%, resin content 36-42%, insoluble resin content 30-40%; in the third step, the mould pressing time is 5-8 min/mm; the mould pressing temperature is 190-210 ℃; the molding pressure is pressurized to 30+/-5 MPa/cm in two steps 2 The method comprises the steps of carrying out a first treatment on the surface of the Exhausting and hot-pressing after die assembly for 5-20 s; heat treatment is carried out for 3 to 6 hours at 220 ℃.
Specifically, taking bismaleimide rubberized fabric with the volatile content of 1%, the resin content of 35% and the insoluble resin content of 18% as an example, the slot wedge molding process is as follows:
(1) Cutting and weighing: cutting the rubberized glass fabric into a required size according to the length and the weight of the slot wedge;
(2) And (3) coiling: selecting a proper material rolling rod according to a material rolling rod diameter calculation formula, and uniformly wrapping bismaleimide adhesive tape on a heating flat plate at 100-140 ℃ by using the material rolling rod to form a cylinder;
(3) Pressing: placing the rolled cylinder into a preheated mold cavity, closing an upper mold, placing the upper mold at the central position of the lower part of an electric heating plate of an oil press, starting the oil press to enable an upper pressing plate of the oil press to contact the upper surface of the mold, immediately pressurizing and deflating for 3-8 times after preheating for 30s under the condition of no pressurization, performing gradient pressurizing in three steps under the condition of no obvious glue overflow, checking the value of a pressure gauge while pressurizing, stopping pressurizing after the technological specified pressure is reached, and performing heat preservation and pressure maintaining;
(4) Demolding: after the product reaches the prescribed heat preservation and pressure maintaining time, releasing pressure, demoulding, taking out the product and removing the glue overflow edge;
(5) And (3) heat treatment: the slot wedge is put into a baking oven, gradually heated to 220 ℃ from room temperature and then kept for 3-6 h.
The embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present invention and the scope of the claims, which are all within the scope of the present invention.
Claims (10)
1. A coil stock stick in motor slot wedge mould pressing technology, includes cylindric coil stock stick body, characterized in that, coil stock stick body's diameter phi Rod The formula is satisfied:wherein phi is s To be converted into a circular diameter by the perimeter of the section of the slot wedge of the motor s X pi = motor slot wedge cross section perimeter.
2. The roll bar in the motor slot wedge molding process of claim 1, wherein one end of the roll bar body is provided with a groove for clamping the rubberized glass fabric.
3. A roll bar in a motor slot wedge molding process as claimed in claim 1 or 2, wherein a handle is attached to the roll bar body.
4. A coil stock rod in a motor slot wedge molding process as claimed in claim 2, wherein the thickness of the groove is 0.2-0.4 mm.
5. A motor slot wedge molding process comprising:
step one, cutting the rubberized glass cloth into required sizes according to the length and the weight of the slot wedge;
step two, wrapping the rubberized glass fabric into a cylinder by using a material rolling rod;
step three, sequentially pressing, demolding and heat treatment are carried out on the cylinder;
in the second step, the rubberized glass fabric is wrapped into a cylinder by using a material rolling rod in the motor slot wedge molding process according to any one of claims 1 to 4.
6. The motor slot wedge molding process of claim 5, wherein in the second step, the rubberized glass fabric is a bismaleimide rubberized fabric.
7. The motor slot wedge molding process of claim 6, wherein in the bismaleimide rubberized fabric: volatile content less than or equal to 1.5%, resin content 33% -42%, insoluble resin content less than or equal to 10%;
in the third step, the mould pressing time is 8-10 min/mm; the mould pressing temperature is 190-200 ℃; the molding pressure is pressurized to 25+/-5 MPa/cm in three steps 2 The method comprises the steps of carrying out a first treatment on the surface of the Exhausting and hot-pressing after die assembly for 30-50 s; heat treatment is carried out for 3 to 6 hours at 220 ℃.
8. The motor slot wedge molding process of claim 6, wherein in the bismaleimide rubberized fabric: volatile content less than or equal to 1.5%, resin content 33-42%, insoluble resin content 10-20%;
in the third step, the mould pressing time is 8-10 min/mm; the mould pressing temperature is 190-200 ℃; the molding pressure is pressurized to 25+/-5 MPa/cm in three steps 2 The method comprises the steps of carrying out a first treatment on the surface of the Exhausting and hot-pressing after 20-40 s of die assembly; heat treatment is carried out for 3 to 6 hours at 220 ℃.
9. The motor slot wedge molding process of claim 6, wherein in the bismaleimide rubberized fabric: volatile content less than or equal to 1.5%, resin content 30-40%, insoluble resin content 20-30%;
in the third step, the mould pressing time is 5-8 min/mm; the mould pressing temperature is 200-210 ℃; the molding pressure is pressurized to 30+/-5 MPa/cm in two steps 2 The method comprises the steps of carrying out a first treatment on the surface of the Exhausting and hot-pressing after die assembly for 10-30 s; heat treatment is carried out for 3 to 6 hours at 220 ℃.
10. The motor slot wedge molding process of claim 6, wherein in the bismaleimide rubberized fabric: volatile content less than or equal to 1.5%, resin content 36-42%, insoluble resin content 30-40%;
in the third step, the mould pressing time is 5-8 min/mm; the mould pressing temperature is 190-210 ℃; the molding pressure is pressurized to 30+/-5 MPa/cm in two steps 2 The method comprises the steps of carrying out a first treatment on the surface of the Exhausting and hot-pressing after die assembly for 5-20 s; heat treatment is carried out for 3 to 6 hours at 220 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810756216.9A CN108667232B (en) | 2018-07-11 | 2018-07-11 | Coil stock rod in motor slot wedge molding process and motor slot wedge molding process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810756216.9A CN108667232B (en) | 2018-07-11 | 2018-07-11 | Coil stock rod in motor slot wedge molding process and motor slot wedge molding process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108667232A CN108667232A (en) | 2018-10-16 |
| CN108667232B true CN108667232B (en) | 2024-01-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810756216.9A Active CN108667232B (en) | 2018-07-11 | 2018-07-11 | Coil stock rod in motor slot wedge molding process and motor slot wedge molding process |
Country Status (1)
| Country | Link |
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| CN (1) | CN108667232B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5925467A (en) * | 1995-07-14 | 1999-07-20 | Abb Research Ltd. | Electrically and thermally conductive plastic and use of this plastic |
| EP1638190A1 (en) * | 2004-09-15 | 2006-03-22 | Siemens Aktiengesellschaft | Apparatus for fixing of bar conductors in slots of electric machines |
| CN102290901A (en) * | 2011-08-22 | 2011-12-21 | 海宁永大电气新材料有限公司 | Composite slot wedge used for motor rotor and manufacturing method thereof |
| CN107557610A (en) * | 2017-08-15 | 2018-01-09 | 徐高杰 | A kind of preparation technology of short route slot wedge copper alloy |
-
2018
- 2018-07-11 CN CN201810756216.9A patent/CN108667232B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5925467A (en) * | 1995-07-14 | 1999-07-20 | Abb Research Ltd. | Electrically and thermally conductive plastic and use of this plastic |
| EP1638190A1 (en) * | 2004-09-15 | 2006-03-22 | Siemens Aktiengesellschaft | Apparatus for fixing of bar conductors in slots of electric machines |
| CN102290901A (en) * | 2011-08-22 | 2011-12-21 | 海宁永大电气新材料有限公司 | Composite slot wedge used for motor rotor and manufacturing method thereof |
| CN107557610A (en) * | 2017-08-15 | 2018-01-09 | 徐高杰 | A kind of preparation technology of short route slot wedge copper alloy |
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| Publication number | Publication date |
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| CN108667232A (en) | 2018-10-16 |
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