CN111730288B - CuNi14Al3 shrink ring forming method for asynchronous traction motor rotor - Google Patents

CuNi14Al3 shrink ring forming method for asynchronous traction motor rotor Download PDF

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Publication number
CN111730288B
CN111730288B CN202010442898.3A CN202010442898A CN111730288B CN 111730288 B CN111730288 B CN 111730288B CN 202010442898 A CN202010442898 A CN 202010442898A CN 111730288 B CN111730288 B CN 111730288B
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ring
ring rolling
rolling
tool
blank
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CN111730288A (en
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吴斌
庾高峰
靖林
王聪利
李小阳
马明月
马兴赞
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Shaanxi Sirui Advanced Materials Co Ltd
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Shaanxi Sirui Advanced Materials Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23PMETAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00Making specific metal objects by operations not covered by a single other subclass or a group in this subclass

Abstract

The invention discloses a method for forming a CuNi14Al3 shrink ring for an asynchronous traction motor rotor, which comprises the following steps: manufacturing a ring rolling tool, blanking, compiling a ring rolling program, heating, preheating the ring rolling tool, blank manufacturing, reaming, flattening the end face and rolling the ring. Compared with the prior art, the size precision of the grinding ring prepared by the method is improved, the reserved machining allowance is small, and the material utilization rate is high. Compared with the prior art, the ring rolling forming mode is static load deformation, the deformation mode is uniform, and the mechanical property of the contraction ring is also uniform.

Description

CuNi14Al3 shrink ring forming method for asynchronous traction motor rotor
Technical Field
The invention relates to the technical field of motor rotor materials, in particular to a method for forming a CuNi14Al3 shrink ring for an asynchronous traction motor rotor.
Background
The electric locomotive required by high-speed rail, subway, light rail and intercity railway is important equipment for rail traffic developed by the country, and the high-performance precise copper part is a key part of a traction motor of the rail traffic locomotive, and is required to have high strength and good plasticity, and simultaneously, the electric locomotive also needs to have excellent electric conductivity, heat conductivity, corrosion resistance and the like. At present, the rotor of the high-speed asynchronous traction motor for rail transit adopts a squirrel-cage structure, and the rotor material comprises a conducting bar, an end ring, a contraction ring and the like.
The shrink ring is one of the important parts of the motor rotor, is sleeved on an end ring in a hot mode, and is subjected to tight fit force, centrifugal force of the shrink ring and the winding end, bending stress and the like, and the superimposed stress is high. It is therefore desirable that the shrink ring material must have sufficient strength and as high a plasticity and toughness as possible, minimal residual stress, and minimal hazardous defects. To reduce leakage and eddy current losses, the shrink ring material must be non-magnetic. With the increasing of the motor power, the stress born by the shrink ring also gradually rises, and when the unit runs, the shrink ring can generate heat due to the action of an electromagnetic field and current. The temperature rise is usually about one hundred degrees, and in special cases can reach several hundred degrees instantaneously, so the shrink ring material should also pay attention to the problem of high-temperature softening. In addition, motor shrink rings are subject to accidents due to fatigue cracks. At present, copper-based alloys are used as shrink ring materials for traction motors. The copper-based alloy not only maintains the high strength performance of the steel shrink ring, but also has higher toughness and good thermal conductivity and stress corrosion resistance, and has obvious effects of reducing the temperature rise of the rotor and reducing the end fracture of the rotor.
The CuNi14Al3 material has high strength, high toughness, stress corrosion resistance, high wear resistance, good thermal conductivity and no magnetism. Is a common motor shrink ring material.
The conventional forming mode of the CuNi14Al3 shrink ring for the asynchronous traction motor rotor is forging, and the working procedures comprise blanking, heating, cake upsetting, punching, trestle reaming, plane surface and the like. Firstly, the reaming method for forging the CuNi14Al3 shrink ring is saddle reaming, and the material utilization rate is low because the precision is low during saddle reaming, the machining allowance required by a forge piece is large, and more raw materials need to be input. Secondly, the hole expanding mode of the forged CuNi14Al3 shrink ring is saddle hole expanding, the hole expanding is completed by one-time striking by a forging hammer, the deformation mode is impact deformation, and the process is controlled by the skill level of an operator, so the mechanical property of the shrink ring is not particularly uniform. Third, forging a CuNi14Al3 shrink ring is relatively inefficient. Therefore, it is very important to develop a new method for forming the CuNi14Al3 shrink ring for the asynchronous traction motor rotor.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a method for forming a CuNi14Al3 shrink ring for an asynchronous traction motor rotor.
The technical scheme of the invention is as follows:
a method for forming a CuNi14Al3 shrink ring for an asynchronous traction motor rotor comprises the following steps:
s1 manufacturing ring grinding tool
Calculating the size of a product ring rolling according to the size of a shrink ring product, and manufacturing a ring rolling tool; the ring grinding tool is made of die steel, is forged and formed, and is subjected to quenching and tempering heat treatment, turning, milling and tapping to prepare the structure;
s2 blanking
Calculating the blank weight required by product ring rolling according to the size of the product ring rolling, and selecting raw materials for blanking;
s3 compiling ring rolling program
Inputting the size of the ring rolling machine into the ring rolling machine according to the calculated size of the ring rolling machine, and compiling a ring rolling program;
s4, heating
Before forging, heating the blanked blank at 950 +/-20 ℃ for a certain time;
s5 preheating ring grinding tool
Mounting the manufactured ring rolling tool on a ring rolling machine, and preheating the ring rolling tool to 200-300 ℃;
s6, blank making
Discharging the heated blank out of the furnace, and performing blank manufacturing on a forging press, wherein the blank manufacturing mainly comprises heading, punching and pre-reaming;
s7, reaming
Sleeving the ring piece subjected to blank making on a ring rolling clamping groove of a ring rolling tool subjected to installation and preheating, and reaming according to a pre-programmed ring rolling procedure;
s8, flattening end face
Taking the ring piece subjected to hole expansion out of the ring rolling clamping groove, and flattening the end face on a forging press to eliminate an end face groove formed in the process of rolling expansion;
s9, grinding ring
And sleeving the ring piece with the flat end surface on a ring rolling clamping groove of a ring rolling tool, and rolling the ring according to a ring rolling procedure which is pre-programmed.
Further, in above-mentioned scheme, in step S1, the ring rolling frock is by ring rolling core roller and establish ring rolling draw-in groove, the location head that is located ring rolling core roller one end, the square tail that is located the ring rolling core roller other end at ring rolling core roller middle part constitute, be round platform shape structure between square tail and the ring rolling core roller, the square tail is located the tip of round platform shape structure has, and the ring rolling draw-in groove is close to square tail one side, is equipped with fastening screw in the inside of square tail, fastening screw extends to one section in the round platform shape structure.
Further, in the above scheme, in step S1, a certain processing margin is respectively reserved in three dimensions of the outer diameter, the inner diameter, and the height according to the product size of the shrink ring, the size of the ring mill of the product is calculated, and then the ring mill tool is manufactured according to the size of the ring mill, wherein the process of manufacturing the ring mill tool specifically includes: the ring rolling machine tool material is 42CrMo, the manufacturing process comprises the steps of blanking, forging, rough turning, heat treatment, finish turning, square milling and tapping, the forging heating temperature is 1180 ℃, the temperature is kept for 2.5 hours, and the forging size is a bar with the diameter of 200mm and the length of 630 mm; the forging is subjected to rough turning firstly, and then is subjected to heat treatment, wherein the heat treatment comprises quenching and tempering, the quenching heating temperature is 1020 ℃, and oil cooling is carried out; tempering and heating at 180 ℃, and preserving heat for 2 hours; and after heat treatment, carrying out finish turning according to the required size, milling after finish turning, and punching after milling.
Further, in the above scheme, in step S4, the method for calculating the heat preservation time includes: ingot diameter/2 x 1.5 minutes.
Further, in the above scheme, in step S6, the specific steps of blank making are as follows: firstly, upsetting a blank into a cake, controlling the height and ensuring that the height is the same as the size of a product ring mill, then punching the blank by using a punch, pre-reaming the blank on a trestle, and ensuring that the blank can be sleeved on a ring mill clamping groove of a ring mill tool.
Further, in the above solution, in the step S7, during the hole expanding process, the feeding speeds of the rolling wheel and the holding roller of the ring rolling mill are ensured to be performed according to the principle of fast first and slow second, so as to ensure that the hole expanding process is performed smoothly. The method specifically comprises the following steps: the feeding speed of the rolling wheel is adjusted to 1 mm/s after 2 mm/s; the feed rate of the wrap around rollers was started at 10 mm/sec. After which it was adjusted to 5 mm/sec.
Further, in the above scheme, in the step S7, the temperature of the billet during forging should not be lower than 720 ℃ during hole expansion, and when the temperature is lower than 720 ℃, the billet is re-charged and heated to 950 ℃ ± 20 ℃.
Further, in the above scheme, in step S9, in the ring rolling process, to ensure that the feeding speeds of the rolling wheel and the holding roller of the ring rolling mill are stable, specifically: the feeding speed of the rolling wheel is adjusted to 1 mm/s after 2 mm/s; the feed rate of the wrap around rollers was started at 10 mm/sec. After which it was adjusted to 5 mm/sec. So as to ensure the smooth proceeding of the ring rolling process and avoid the situations of elliptical deformation and the like.
Compared with the existing preparation method, the invention has the beneficial effects that: according to the CuNi14Al3 shrink ring forming method provided by the invention, the prepared CuNi14Al3 shrink ring has the advantages of improved precision of the size of a ring rolling, small reserved machining allowance and high material utilization rate, compared with the prior art, the ring rolling forming method is static load deformation, uniform deformation mode, uniform mechanical property and product performance of the shrink ring, and the method can replace the existing CuNi14Al3 shrink ring forging forming method.
Drawings
Fig. 1 is a schematic structural view of the ring rolling tool of the invention.
Detailed Description
The invention provides a method for forming a CuNi14Al3 shrink ring for an asynchronous traction motor rotor.
The invention is described in further detail below with reference to the figures and the examples, which should not be construed as limiting the scope of the invention, but rather as enabling the skilled engineer in the field to make several insubstantial modifications and adaptations of the invention based on the above disclosure.
Example 1
The embodiment takes a CuNi14Al3 shrink ring with 400mm of outer diameter, 390mm of inner diameter and 40mm of height as an example, and is prepared by the following method:
s1, manufacturing a ring grinding tool: calculating the ring rolling sizes of the product to be 410mm in outer diameter, 375mm in inner diameter and 48mm in height according to the size of the shrink ring product, manufacturing a ring rolling tool according to the ring rolling sizes,
the structure of the ring rolling tool is as follows: by ring rolling core roller 4 and establish ring rolling draw-in groove 1 at 4 middle parts of ring rolling core roller, be located the location head 3 of 4 one ends of ring rolling core roller, be located the square tail 2 of the 4 other ends of ring rolling core roller and constitute, be round platform shape structure between square tail 2 and the ring rolling core roller 4, square tail 2 is located the tip of round platform shape structure has, and ring rolling draw-in groove 1 is close to 2 one sides of square tail, is equipped with fastening thread 5 in 2 inside of square tail, fastening thread 5 extends to one section in the round platform shape structure.
The ring rolling tool is made of die steel, the manufacturing method of the ring rolling tool comprises forging heating treatment, the tool material of the ring rolling machine is 42CrMo, the forging heating temperature is 1180 ℃, the temperature is kept for 2.5 hours, and the forging size is a bar with the diameter of 200mm and the length of 630 mm. The forging is roughly turned firstly, and then is subjected to heat treatment, wherein the heat treatment comprises quenching and tempering, the quenching heating temperature is 1020 ℃, and oil cooling is carried out. Tempering and heating at 180 ℃, and preserving heat for 2 hours. And after heat treatment, finish turning is carried out according to the size shown in the figure, milling is carried out after finish turning, and punching is carried out after milling.
S2, blanking: the weight of the blank required by the product ring rolling is calculated according to the size of the product ring rolling is 9kg, raw materials with the diameter of 120mm are selected for blanking, and the blanking length is 94 mm.
S3, compiling a ring rolling program: inputting the height, the outer diameter, the inner diameter and the wall thickness into a ring rolling machine control computer according to the calculated size of the ring rolling machine to generate a ring rolling program, wherein the model of the ring rolling machine is as follows: D51Y-630E.
S4, heating: before forging, the blanked blank is heated at 930 ℃ for 60 minutes.
S5, preheating a ring grinding tool: and (3) mounting the manufactured ring rolling tool on a ring rolling machine, and preheating the tool to 200 ℃ by using a preheating block prepared in advance.
S6, blank making: discharging the heated blank out of the furnace, and making the blank on a forging press, wherein a heading cake is firstly carried out, and the heading cake has the size diameter of 168mm and the height of 48 mm. A punch with the diameter of 90mm is selected for punching, pre-reaming is carried out on a saddle after punching is finished, and the pre-reaming size is 247mm in outer diameter, 190mm in inner diameter and 48mm in height.
S7, reaming: ring piece cover that the blanking was accomplished is on the ring rolling draw-in groove of the ring rolling frock of installation and preheating, carries out reaming according to the ring rolling procedure of compiling in advance, and the reaming size is: the external diameter 343mm, internal diameter 300mm, height 48mm, guarantee that ring rolls rolling wheel and embrace roller feed speed and go on according to the principle that the speed is fast first after slow in the reaming process to guarantee going on smoothly of rolling process.
S8, flattening end faces: and taking out the ring piece subjected to hole expansion from the ring rolling clamping groove, and flattening the end face on a forging press.
S9, ring rolling: the ring piece that will level the terminal surface and accomplish is overlapped on ring rolling frock ring rolling draw-in groove again, rolls the ring according to the ring rolling procedure of compiling in advance, and it is steady to roll the ring in-process and guarantee ring rolling machine rolling wheel and embrace roller feed speed to ensure that the ring process of rolling goes on smoothly, and situations such as elliptical deformation do not appear, the ring size of rolling: an outer diameter of 410mm, an inner diameter of 375mm and a height of 48 mm.
And sampling the obtained ring piece to detect the mechanical properties including tensile strength, yield strength, elongation and Brinell hardness. The results are shown in Table 1.
Example 2
The embodiment takes a CuNi14Al3 shrink ring with an outer diameter of 500mm, an inner diameter of 480mm and a height of 50mm as an example, and is prepared by the following method:
s1, manufacturing a ring grinding tool: calculating the size of the ring rolling of the product to be 512mm of outer diameter, 468mm of inner diameter and 58mm of height according to the size of the contraction ring product, manufacturing a ring rolling tool according to the size of the ring rolling,
the structure of the ring rolling tool is as follows: by ring rolling core roller 4 and establish ring rolling draw-in groove 1 at 4 middle parts of ring rolling core roller, be located the location head 3 of 4 one ends of ring rolling core roller, be located the square tail 2 of the 4 other ends of ring rolling core roller and constitute, be round platform shape structure between square tail 2 and the ring rolling core roller 4, square tail 2 is located the tip of round platform shape structure has, and ring rolling draw-in groove 1 is close to 2 one sides of square tail, is equipped with fastening thread 5 in 2 inside of square tail, fastening thread 5 extends to one section in the round platform shape structure.
The ring rolling tool is made of die steel, the manufacturing method of the ring rolling tool comprises forging heating treatment, the tool material of the ring rolling machine is 42CrMo, the forging heating temperature is 1180 ℃, the temperature is kept for 2.5 hours, and the forging size is a bar with the diameter of 200mm and the length of 630 mm. The forging is roughly turned firstly, and then is subjected to heat treatment, wherein the heat treatment comprises quenching and tempering, the quenching heating temperature is 1020 ℃, and oil cooling is carried out. Tempering and heating at 180 ℃, and preserving heat for 2 hours. And after heat treatment, finish turning is carried out according to the size shown in the figure, milling is carried out after finish turning, and punching is carried out after milling.
S2, blanking: the weight of the blank required by the product ring rolling is calculated according to the size of the product ring rolling is 18kg, raw materials with the diameter of 150mm are selected for blanking, and the blanking length is 120 mm.
S3, compiling a ring rolling program: inputting the height, the outer diameter, the inner diameter and the wall thickness into a ring rolling machine control computer according to the calculated size of the ring rolling machine to generate a ring rolling program, wherein the model of the ring rolling machine is as follows: D51Y-630E.
S4, heating: before forging, the blanked blank is heated at 950 ℃ for 70 minutes.
S5, preheating a ring grinding tool: and (3) mounting the manufactured ring rolling tool on a ring rolling machine, and preheating the tool to 260 ℃ by using a preheating block prepared in advance.
S6, blank making: discharging the heated blank out of the furnace, and making the blank on a forging press, wherein a pier cake is firstly made, and the size diameter of the pier cake is 216mm, and the height of the pier cake is 58 mm. A punch with the diameter of 90mm is selected for punching, pre-reaming is carried out on a saddle frame after punching is finished, and the pre-reaming size is 289mm in outer diameter, 200mm in inner diameter and 58mm in height.
S7, reaming: ring piece cover that the blanking was accomplished is on the ring rolling draw-in groove of the ring rolling frock of installation and preheating, carries out reaming according to the ring rolling procedure of compiling in advance, and the reaming size is: the outer diameter is 442mm, the inner diameter is 390mm, the height is 58mm, and the feeding speed of a rolling wheel and a holding roller of the ring rolling mill is ensured to be carried out according to the principle of first-speed and second-speed in the reaming process so as to ensure the smooth running of the rolling and reaming process.
S8, flattening end faces: and taking out the ring piece subjected to hole expansion from the ring rolling clamping groove, and flattening the end face on a forging press.
S9, ring rolling: the ring piece that will level the terminal surface and accomplish is overlapped on ring rolling frock ring rolling draw-in groove again, rolls the ring according to the ring rolling procedure of compiling in advance, and it is steady to roll the ring in-process and guarantee ring rolling machine rolling wheel and embrace roller feed speed to ensure that the ring process of rolling goes on smoothly, and situations such as elliptical deformation do not appear, the ring size of rolling: 512mm external diameter, 468mm internal diameter, 58mm height.
And sampling the obtained ring piece to detect the mechanical properties including tensile strength, yield strength, elongation and Brinell hardness. The results are shown in Table 1.
Example 3
The embodiment takes a CuNi14Al3 shrink ring with an outer diameter of 600mm, an inner diameter of 580mm and a height of 55mm as an example, and is prepared by the following method:
s1, manufacturing a ring grinding tool: calculating the ring rolling sizes of the product to be 612mm in outer diameter, 568mm in inner diameter and 63mm in height according to the size of the contraction ring product, manufacturing a ring rolling tool according to the ring rolling sizes,
the structure of the ring rolling tool is as follows: by ring rolling core roller 4 and establish ring rolling draw-in groove 1 at 4 middle parts of ring rolling core roller, be located the location head 3 of 4 one ends of ring rolling core roller, be located the square tail 2 of the 4 other ends of ring rolling core roller and constitute, be round platform shape structure between square tail 2 and the ring rolling core roller 4, square tail 2 is located the tip of round platform shape structure has, and ring rolling draw-in groove 1 is close to 2 one sides of square tail, is equipped with fastening thread 5 in 2 inside of square tail, fastening thread 5 extends to one section in the round platform shape structure.
The ring rolling tool is made of die steel, the manufacturing method of the ring rolling tool comprises forging heating treatment, the tool material of the ring rolling machine is 42CrMo, the forging heating temperature is 1180 ℃, the temperature is kept for 2.5 hours, and the forging size is a bar with the diameter of 200mm and the length of 630 mm. The forging is roughly turned firstly, and then is subjected to heat treatment, wherein the heat treatment comprises quenching and tempering, the quenching heating temperature is 1020 ℃, and oil cooling is carried out. Tempering and heating at 180 ℃, and preserving heat for 2 hours. And after heat treatment, finish turning is carried out according to the size shown in the figure, milling is carried out after finish turning, and punching is carried out after milling.
S2, blanking: the weight of the blank required by the product ring rolling is calculated according to the size of the product ring rolling is 23kg, raw materials with the diameter of 150mm are selected for blanking, and the blanking length is 153 mm.
S3, compiling a ring rolling program: inputting the height, the outer diameter, the inner diameter and the wall thickness into a ring rolling machine control computer according to the calculated size of the ring rolling machine to generate a ring rolling program, wherein the model of the ring rolling machine is as follows: D51Y-630E.
S4, heating: before forging, the blanked blank is heated at 970 ℃ for 80 minutes.
S5, preheating a ring grinding tool: and (3) mounting the manufactured ring rolling tool on a ring rolling machine, and preheating the tool to 300 ℃ by using a preheating block prepared in advance.
S6, blank making: discharging the heated blank out of the furnace, making the blank on a forging press, and upsetting a cake, wherein the size of the upset cake is 234mm in diameter and 63mm in height. A punch with the diameter of 110mm is selected for punching, pre-reaming is carried out on a saddle after punching is finished, and the pre-reaming size is 304mm in outer diameter, 200mm in inner diameter and 63mm in height.
S7, reaming: ring piece cover that the blanking was accomplished is on the ring rolling draw-in groove of the ring rolling frock of installation and preheating, carries out reaming according to the ring rolling procedure of compiling in advance, and the reaming size is: the outer diameter is 531mm, the inner diameter is 480mm, the height is 63mm, and the feeding speed of a rolling wheel and a holding roller of the ring rolling mill is ensured to be carried out according to the principle of first-speed and second-speed in the hole expanding process so as to ensure the smooth running of the rolling and expanding process.
S8, flattening end faces: and taking out the ring piece subjected to hole expansion from the ring rolling clamping groove, and flattening the end face on a forging press.
S9, ring rolling: the ring piece that will level the terminal surface and accomplish is overlapped on ring rolling frock ring rolling draw-in groove again, rolls the ring according to the ring rolling procedure of compiling in advance, and it is steady to roll the ring in-process and guarantee ring rolling machine rolling wheel and embrace roller feed speed to ensure that the ring process of rolling goes on smoothly, and situations such as elliptical deformation do not appear, the ring size of rolling: an outer diameter of 531mm, an inner diameter of 480mm and a height of 63 mm.
The ring obtained from the above 3 examples was sampled to test mechanical properties including tensile strength, yield strength, elongation and brinell hardness. The results are shown in Table 1.
Comparative example
Three asynchronous traction motor rotors with the same specification in the embodiment are molded by the conventional process by using a CuNi14Al3 shrinkage ring, and are respectively used as comparative examples, and the mechanical properties of the rotors are sampled and detected, and the results are shown in Table 1.
As can be seen from the data in Table 1, compared with the prior art, the method for molding the shrink ring provided by the invention has the advantages that raw materials are saved, the utilization rate of the raw materials is greatly improved, the mechanical properties of the prepared shrink ring are uniform, and the yield strength and the elongation percentage of the material are improved while the tensile strength and the hardness of the material are ensured.

Claims (6)

1. A method for forming a CuNi14Al3 shrink ring for an asynchronous traction motor rotor is characterized by comprising the following steps:
s1 manufacturing ring grinding tool
Calculating the size of a product ring rolling according to the size of a shrink ring product, and manufacturing a ring rolling tool; the ring rolling tool is made of die steel, is forged and formed, and is subjected to quenching and tempering heat treatment, turning, milling and tapping to prepare a ring rolling tool structure;
s2 blanking
Calculating the blank weight required by product ring rolling according to the size of the product ring rolling, and selecting raw materials for blanking;
s3 compiling ring rolling program
Inputting the size of the ring rolling machine into the ring rolling machine according to the calculated size of the ring rolling machine, and compiling a ring rolling program;
s4, heating
Before forging, heating the blanked blank at 950 +/-20 ℃ for a certain time;
s5 preheating ring grinding tool
Mounting the manufactured ring rolling tool on a ring rolling machine, and preheating the ring rolling tool to 200-300 ℃;
s6, blank making
Discharging the heated blank out of the furnace, and performing blank manufacturing on a forging press, wherein the blank manufacturing mainly comprises heading, punching and pre-reaming;
s7, reaming
Sleeving the ring piece subjected to blank making on a ring rolling clamping groove of a ring rolling tool subjected to installation and preheating, and reaming according to a pre-programmed ring rolling procedure;
s8, flattening end face
Taking the ring piece subjected to hole expansion out of the ring rolling clamping groove, and flattening the end face on a forging press;
s9, grinding ring
Sleeving the ring piece with the flat end surface on a ring rolling clamping groove of a ring rolling tool, and rolling the ring according to a pre-programmed ring rolling procedure;
in the step S1, the ring rolling tooling is composed of a ring rolling core roller (4), a ring rolling clamping groove (1) formed in the middle of the ring rolling core roller (4), a positioning head (3) located at one end of the ring rolling core roller (4), and a square tail (2) located at the other end of the ring rolling core roller (4), a circular truncated cone-shaped structure is arranged between the square tail (2) and the ring rolling core roller (4), the square tail (2) is located at the small end of the circular truncated cone-shaped structure, the ring rolling clamping groove (1) is close to one side of the square tail (2), a fastening thread (5) is arranged inside the square tail (2), and the fastening thread (5) extends to one section in the circular truncated cone-shaped structure;
in step S1, a certain processing margin is respectively reserved in three dimensions of the outer diameter, the inner diameter and the height according to the product size of the shrink ring, the size of the ring mill of the product is calculated, the ring mill tool is manufactured according to the size of the ring mill, and the process of manufacturing the ring mill tool specifically comprises the following steps: the ring rolling machine tool material is 42CrMo, the manufacturing process comprises the steps of blanking, forging, rough turning, heat treatment, finish turning, square milling and tapping, the forging heating temperature is 1180 ℃, the temperature is kept for 2.5 hours, and the forging size is a bar with the diameter of 200mm and the length of 630 mm; the forging is subjected to rough turning firstly, and then is subjected to heat treatment, wherein the heat treatment comprises quenching and tempering, the quenching heating temperature is 1020 ℃, and oil cooling is carried out; tempering and heating at 180 ℃, and preserving heat for 2 hours; and after heat treatment, carrying out finish turning according to the required size, milling after finish turning, and punching after milling.
2. The method for forming the shrinkage ring of CuNi14Al3 for the asynchronous traction motor rotor as claimed in claim 1, wherein the method for calculating the holding time in step S4 comprises: ingot diameter/2 x 1.5 minutes.
3. The method for forming the shrinkage ring of CuNi14Al3 for the asynchronous traction motor rotor as claimed in claim 1, wherein in step S6, the concrete steps of the blank making are as follows: firstly, upsetting a blank into a cake, controlling the height and ensuring that the height is the same as the size of a product ring mill, then punching the blank by using a punch, pre-reaming the blank on a trestle, and ensuring that the blank can be sleeved on a ring mill clamping groove of a ring mill tool.
4. The method for forming the CuNi14Al3 shrink ring for the asynchronous traction motor rotor as recited in claim 1, wherein the step S7 is performed to ensure that the feeding speed of the grinding wheel and the holding roller of the ring rolling mill is faster before slower during the hole expanding process.
5. The method for forming a CuNi14Al3 shrink ring for an asynchronous traction motor rotor as set forth in claim 1, wherein the temperature of the billet during forging is not lower than 720 ℃ during hole expansion in step S7, and the billet is re-charged and heated to 950 ℃ ± 20 ℃ when the temperature is lower than 720 ℃.
6. The method for forming the shrinkage ring of CuNi14Al3 for the asynchronous traction motor rotor as claimed in claim 1, wherein in step S9, the smooth feeding speed of the grinding wheel and the holding roller of the ring rolling mill is ensured during the ring rolling process.
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