CN110405040B - Reverse spinning method for ultrahigh-strength steel outer-step thin-wall cylinder - Google Patents
Reverse spinning method for ultrahigh-strength steel outer-step thin-wall cylinder Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/14—Spinning
- B21D22/16—Spinning over shaping mandrels or formers
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/30—Stress-relieving
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
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Abstract
The invention provides a reverse spinning method of an ultrahigh-strength steel outer-step thin-wall cylinder, which comprises the steps of blanking a spinning blank, annealing the blank, machining the blank subjected to heat treatment to obtain a blank to be subjected to reverse spinning, performing two-time reverse spinning forming on the blank, spinning to the designed required size, and performing stress relief annealing on the cylinder obtained by spinning. The invention is used for spinning and forming the ultra-high strength steel outer surface step cylinder, can ensure the size and the shape and position precision of the step cylinder, improves the qualification rate and the processing efficiency of the combustion chamber shell, simultaneously provides a measure for controlling the reverse spinning shape and position precision of the thin-wall step cylinder, and provides technical reference for spinning the ultra-high strength steel step piece.
Description
Technical Field
The invention belongs to the technical field of advanced manufacturing, and relates to spinning forming and process technology of ultrahigh-strength steel D6AC cylindrical parts mainly used for aviation and aerospace.
Background
The solid rocket engine combustion chamber shell is generally composed of a front connecting piece, a cylinder body and a rear connecting piece, wherein the cylinder body is required to be light in weight, high in strength, excellent in performance and capable of bearing large load, and an ultrahigh-strength steel thin-wall spinning piece is generally adopted. The ultra-high strength steel spin forming is a key process technology for producing and manufacturing the cylinder body, along with the requirement of technical development, the number of the ultra-high strength steel step cylinder bodies is gradually increased, and the steps generally play a role and aim of guiding and increasing strength. For a low-alloy ultrahigh-strength steel thin-wall cylinder with a slenderness ratio of more than 12 and a step on the outer surface, the thickness of the thin-wall is 1.2-1.35 mm, the width, the size and the form and position precision of the step are ensured, and the requirements on a spinning process are high.
The patent CN 102416414A "control method of ultra-high strength steel thin-wall cylinder shape accuracy" introduces a method of performing tempering stabilization correction after correcting the shape of a cylinder shell by a special correction clamp after cylinder quenching. The method for controlling the thin-wall shape and position precision by using the special shape correcting clamp after the heat treatment needs special tools, and the technical process is relatively complex.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a reverse spinning process method of a thin-wall cylinder with steps on the outer surface, which is used for spinning and forming the step cylinder on the outer surface of ultrahigh-strength steel, can ensure the size and the shape and position precision of the step cylinder, improve the qualification rate and the processing efficiency of a combustion chamber shell, and simultaneously provides a measure for controlling the reverse spinning shape and position precision of the thin-wall step cylinder to provide technical reference for spinning of ultrahigh-strength steel step parts.
The technical scheme adopted by the invention for solving the technical problem comprises the following steps:
1) blanking the spinning blank, and annealing the blank, wherein the hardness is HB 170-235, and the metallographic structure is granular pearlite and ferrite;
2) machining the blank after heat treatment to obtain a blank to be subjected to reverse spinning, wherein the spinning starting position of the blank is consistent with the front angle profile of the spinning wheel;
3) carrying out two-time reverse spinning forming on the blank, and spinning to the design required size;
4) and (4) performing stress relief annealing on the cylinder obtained by spinning.
In the annealing treatment in the step 1), the temperature of the spinning blank is raised to 770 ℃ along with the furnace, the temperature is kept for 1 hour, the furnace is cooled to 730 ℃, the temperature is kept for 2 hours, the furnace is cooled to 690 ℃, the temperature is kept for 15 hours, then the furnace is cooled to below 400 ℃, the spinning blank is taken out of the furnace and air-cooled, and the cooling rate is controlled to be 10 ℃/h +/-1 ℃/h.
The spinning blank adopts a structural seamless steel pipe, and the mechanical property after heat treatment meets the condition that Rm is more than or equal to 1520MPa and A is more than or equal to 9 percent.
The deviation of the outer diameter dimension of the blank in the step 2) is +/-0.05 mm, the deviation of the inner diameter dimension is +/-0.05 mm, and the axial wall thickness deviation and the radial wall thickness deviation of the blank are both less than +/-0.03 mm.
And 3) carrying out two-pass reverse spinning forming on the blank, wherein the wall thickness is spun from 6.2mm to 3.4mm in the first pass, the pass reduction rate is 45.2%, the wall thickness of the second pass is spun to the size 1.20-1.35 mm required by the design, the pass reduction rate is 64.7%, and the total reduction rate is 80.6%.
The core die material for spin forming is CrWMn, an integral quenching method is adopted, the hardness is HRC 58-62, the roughness of the working surface is higher than 0.8 mu m, the roundness of the core die is not more than 0.02mm, the straightness of the whole length of the core die is not more than 0.02mm, and the installation run-out of the core die is not more than 0.05 mm.
In the spinning forming, the counter-rotating steps are subject to trial spinning, namely a value is given to the width of the front spinning step, after the trial spinning is finished, the compensation amount of the front spinning step is determined according to actual detection data, the measured width of the steps is narrower than the design requirement, and the compensation amount is a positive value; measuring the width of the step to be wider than the design requirement, wherein the compensation quantity is a negative value, and the width of the spinning step at the later stage is the sum of the preset value and the compensation quantity; for spinning of two or more steps, the wall thickness range is measured according to the spinning test, the average value of the wall thickness is calculated, the thin-wall section between the steps is reversely calculated, and meanwhile, the center distance of the steps is ensured.
In the spinning forming, the clearance between the spun workpiece and the core die is controlled within 0.10 mm.
In the spinning forming process, a three-spinning-wheel numerical control powerful spinning machine is used, a X1 spinning wheel seat and an X2 spinning wheel seat are assembled with a double-cone spinning wheel, and an X3 spinning wheel seat is assembled with a step spinning wheel. For spinning ultrahigh-strength steel D6AC, selecting a spinning wheel working angle of 20 degrees, a withdrawal angle of 46 degrees, a step spinning wheel polishing angle of 3 degrees and taking r as a radius of a double-cone spinning wheel filletρR is taken from round corner radius of step rotary wheel as 8mmρ6 mm; the rotation speed of a main shaft of the first pass is 150rpm, the feed speed of a spinning wheel is 110mm/min, the feed rate is 0.73, the screw-down quantity of an X1 spinning wheel is 4.5mm, the screw-down quantity of an X2 spinning wheel is 3.5mm, and the screw-down quantity of an X3 spinning wheel is 2.5 mm; the rotation speed of a main shaft of the second pass is 150rpm, the feeding speed of a spinning wheel is 70mm/min, the feeding rate is 0.47, the screw-down amount of an X1 spinning wheel is 1.6mm, the screw-down amount of an X2 spinning wheel is 0.95mm, and the screw-down amount of an X3 spinning wheel is 0.35 mm.
And 4) preserving the temperature of the spinning cylinder for 4 hours at 400 ℃, and eliminating partial spinning stress.
The invention has the beneficial effects that: starting from the spinning link, the problem of the machining precision of the thin-wall step cylindrical part is solved through reasonable matching of spinning process parameters; the reverse spinning core mold is utilized, and the clearance between the inner diameter of a workpiece and the spinning core mold is limited by adjusting the pressing amount of three spinning wheels, the rotating speed of a main shaft and the feeding speed of the spinning wheels, so that the purposes of controlling the dimensional accuracy, the straightness and the roundness of a spinning cylinder are achieved; meanwhile, the reverse spinning core die is simple in structure, the single spinning working hours are few, the cost is saved, and the production efficiency is improved. The invention has simple process and easy operation, and can produce ultrahigh strength steel thin-wall step cylinders in large batch.
Drawings
FIG. 1 is a schematic view of reverse spinning of a cylinder;
FIG. 2 is a schematic view of the cartridge configuration;
FIG. 3 is a process flow diagram of a cartridge;
in the figure, 1-tail top, 2-spinning core mold, 3-step cylinder, 4-spinning wheel, 5-spinning blank, f-spinning wheel feeding direction and v-material flowing direction.
Detailed Description
The present invention will be further described with reference to the following drawings and examples, which include, but are not limited to, the following examples.
The invention provides a reverse spinning method for an ultrahigh-strength steel outer-step thin-wall cylinder, wherein the spinning size and shape and position precision of the ultrahigh-strength steel step cylinder are controlled by the following ways:
a) requirement of spinning tool
CrWMn is selected as a spinning core mold material, an integral quenching method is adopted, the hardness HRC 58-62 is achieved, and the roughness of the working surface is higher than 0.8 mu m. The machining size and the installation precision of the core mold directly influence the quality of a product, and the jumping amount, the straightness and the installation precision of the core mold need to be strictly controlled. The roundness of the core mould is not more than 0.02mm, the whole length linearity of the core mould is not more than 0.02mm, and the installation run-out of the core mould is not more than 0.05 mm; a three-spinning-wheel numerical control powerful spinning machine is used, a X1 spinning wheel seat and an X2 spinning wheel seat are assembled with a double-cone spinning wheel, and an X3 spinning wheel seat is assembled with a step spinning wheel. For spinning ultrahigh-strength steel D6AC, selecting a spinning wheel working angle of 20 degrees, a withdrawal angle of 46 degrees, a step spinning wheel polishing angle of 3 degrees and taking r as a radius of a double-cone spinning wheel filletρR is taken from round corner radius of step rotary wheel as 8mmρ＝6mm；
b) Raw material for spinning blank
The spinning blank adopts a structural seamless steel pipe, and the chemical composition and the mechanical property of the steel pipe meet the use requirements; after the ultra-high strength steel is subjected to heat treatment, the mechanical property of the ultra-high strength steel can meet the condition that Rm is more than or equal to 1520MPa and A is more than or equal to 9 percent.
c) Heat treatment of spinning blanks
And the spinning blank is subjected to spheroidizing annealing, the hardness is HB 170-235, and the structure is granular pearlite and ferrite. Firstly, heating the spinning blank along with a furnace to 770 ℃, preserving heat for 1 hour, cooling the furnace to 730 ℃, preserving heat for 2 hours, cooling the furnace to 690 ℃, preserving heat for 15 hours, then cooling the furnace to below 400 ℃, discharging the spinning blank out of the furnace, and air cooling, wherein the cooling rate is controlled at 10 ℃/h +/-1 ℃/h;
d) spinning blank machining
The spinning blank starting position is designed to be consistent with the front angle molded surface of the spinning wheel, and the blank machining deviation has relatively high requirements due to high precision requirements on the barrel after spinning. The deviation of the outer diameter size is required to be +/-0.05 mm, the deviation of the inner diameter size is required to be +/-0.05 mm, the spinning process follows the law of constant volume and minimum resistance, the side with thin wall thickness is lengthened to be shorter in the spinning process, a horseshoe-shaped port is easy to form, the roundness and the straightness of a cylinder body are influenced, and the deviation of the wall thickness of a blank in the axial direction and the radial direction is required to be less than +/-0.03 mm;
e) spinning process scheme
The cylinder is formed by reverse spinning in two passes, the wall thickness of the first pass is spun from 6.2mm to 3.4mm, the pass reduction rate is 45.2%, the wall thickness of the second pass is spun to the size 1.20 mm-1.35 mm required by design, the pass reduction rate is 64.7%, and the total reduction rate is 80.6%. The size and the shape and position precision of the spinning cylinder are controlled by adjusting the rolling reduction of the spinning wheel, the rotating speed of the main shaft and the feeding speed of the spinning wheel, and the matching of spinning process parameters and the control of the clearance range between a workpiece and a core mold are key links for reversely spinning and processing the thin-wall step cylinder;
1) the step forming method comprises the following steps: the reverse spinning step needs to have a trial spinning stage, namely the width of the spinning front step is given with a value, after the trial spinning is finished, the compensation amount of the step stage is determined according to actual detection data, the compensation amount has a positive part and a negative part, the measured width of the step is narrower than the design requirement, and the compensation amount is a positive value; measuring the width of the step to be wider than the design requirement, wherein the compensation quantity is a negative value, and the width of the spinning step at the later stage is the sum of the preset value and the compensation quantity; for spinning of two or more steps, the wall thickness range is measured according to the spinning test, the average value of the wall thickness is calculated, the thin-wall section between the steps is reversely calculated, and meanwhile, the center distance of the steps is ensured.
2) Controlling the thickness of the thin wall: for a thin-wall step cylinder with the wall thickness of 1.20 mm-1.35 mm, corresponding spinning passes are determined according to the distribution of the reduction rate, the rolling reduction of the three spinning wheels is preset by referring to the theoretical reduction rate, and the adjustment is carried out according to the rebound quantity of the material in the spinning process.
3) The form and position precision control method comprises the following steps: the clearance between the workpiece and the core die is well controlled, the quality of the spinning piece can be improved, the clearance between the spun workpiece and the core die is controlled within 0.10mm, the roundness of the spun cylinder body is basically within 0.20mm, the straightness is generally controlled within 0.20mm, and the size and the form and position precision of the spun workpiece are high.
4) And (3) determining spinning technological parameters: the rotation speed of a main shaft of the first pass is 150rpm, the feed speed of a spinning wheel is 110mm/min, the feed rate is 0.73, the screw-down quantity of an X spinning wheel is 4.5mm, the screw-down quantity of an X2 spinning wheel is 3.5mm, and the screw-down quantity of an X3 spinning wheel is 2.5 mm; the rotation speed of a main shaft of the second pass is 150rpm, the feeding speed of a spinning wheel is 70mm/min, the feeding rate is 0.47, the screw-down amount of an X spinning wheel is 1.6mm, the screw-down amount of an X2 spinning wheel is 0.95mm, and the screw-down amount of an X3 spinning wheel is 0.35 mm.
f) Barrel stress relief annealing
And (4) performing stress relief annealing on the spinning cylinder, and preserving the heat at 400 ℃ for 4 hours to eliminate partial spinning stress.
By adopting the process method and the measures, the structural size and the form and position precision of the thin-wall cylinder body which is spun out and exceeds the strength steel outer step are obviously improved.
The embodiment of the invention aims at the condition that the material is ultra-high-strength steel and the size is
The specific spinning process of the step cylinder of the solid rocket engine comprises the following steps:
the method is characterized in that a numerical control powerful spinning machine is used, three spinning wheels are uniformly distributed at 120 degrees, CrWMn is selected as the core mold and the spinning wheel, an integral quenching method is adopted, the hardness is HRC 58-62, and the working surface roughness is 0.8 mu m. X1, X2 spinning wheel seat assembly bipyramid spinning wheel, X3 spinning wheel seat assembly step spinning wheel to super high strength steel D6AC, select spinning wheel operating angle 20, exit angle 46, the step wheel has the angle of polishing about 3, bipyramid spinning wheel fillet radius r rho is 8mm, step spinning wheel fillet radius r rho is 6 mm.
The specific process flow is as follows:
1) blanking the seamless steel pipe to ensure that the mechanical property, various components and the like of the material meet the index requirements;
2) annealing the blank, wherein the hardness is HB 170-235, and the metallographic structure is granular pearlite and ferrite;
3) machining a blank, wherein the gap between the spinning blank and a core die is required to be 0.10-0.20 mm, the wall thickness of the spinning blank is selected to be 6.2mm, the spinning blank is turned into a blank structure suitable for reverse spinning, and a groove is reserved to facilitate the spinning of a lower wheel;
4) two-pass spinning forming, wherein the first pass is spun from 6.2mm to 3.4mm, the pass reduction rate is 45.2%, the second pass is spun to the design required size of 1.3mm, the pass reduction rate is 64.7%, the total reduction rate is 80.6%, the size and the shape and position precision of the spinning cylinder are controlled mainly by adjusting the rolling reduction of the pass spinning wheel, the rotating speed of the main shaft and the feeding speed of the spinning wheel, and the reasonable matching of spinning process parameters and the numerical range control of the gap between a workpiece and a core die are the key for reversely processing the thin-wall step cylinder. Adjusting spinning technological parameters, wherein the rotating speed of a main shaft of the first pass is 150rpm, the feeding speed of a spinning wheel is 110mm/min, the feeding rate is 0.73, the rolling reduction of an X spinning wheel is 4.5mm, the rolling reduction of an X2 spinning wheel is 3.5mm, and the rolling reduction of an X3 spinning wheel is 2.5 mm; the rotation speed of a main shaft of a second pass is 150rpm, the feeding speed of a spinning wheel is 70mm/min, the feeding rate is 0.47, the rolling reduction of an X spinning wheel is 1.6mm, the rolling reduction of an X2 spinning wheel is 0.95mm, the rolling reduction of an X3 spinning wheel is 0.35mm, the mean value of the inner diameter of a workpiece and the gap of a spinning core mold are controlled within 0.10mm, the roundness of a spinning cylinder body is controlled within 0.20mm, and the straightness is controlled within 0.20 mm;
5) stress relief annealing;
6) turning two ends: the total length of the cylinder body is ensured. And (3) inspecting the size and the shape and position precision of the cylinder after spinning, wherein the average value of the inner diameter, the clearance of the core die and the wall thickness, the roundness and the straightness of the spinning cylinder meet set values, and the size and the shape and position precision meet design requirements after welding into the combustion chamber shell.
Claims (8)
1. The ultrahigh-strength steel outer-step thin-wall cylinder reverse spinning method is characterized by comprising the following steps of:
1) blanking the spinning blank, and annealing the blank, wherein the hardness is HB 170-235, and the metallographic structure is granular pearlite and ferrite;
in the annealing treatment in the step 1), the temperature of the spinning blank is raised to 770 ℃ along with the furnace, the temperature is kept for 1 hour, the temperature of the spinning blank is cooled to 730 ℃, the temperature is kept for 2 hours, the temperature of the spinning blank is cooled to 690 ℃, the spinning blank is kept for 15 hours, then the spinning blank is cooled to below 400 ℃, and the spinning blank is taken out of the furnace and air-cooled, wherein the cooling rate of the three times of furnace cooling is controlled to be 10 ℃/h +/-1 ℃/;
2) machining the blank after heat treatment to obtain a blank to be subjected to reverse spinning, wherein the spinning starting position of the blank is consistent with the front angle profile of the spinning wheel;
3) carrying out two-time reverse spinning forming on the blank, and spinning to the design required size;
in the spinning forming, the counter-rotating steps are subject to trial spinning, namely a value is given to the width of the front spinning step, after the trial spinning is finished, the compensation amount of the front spinning step is determined according to actual detection data, the measured width of the steps is narrower than the design requirement, and the compensation amount is a positive value; measuring the width of the step to be wider than the design requirement, wherein the compensation quantity is a negative value, and the width of the spinning step at the later stage is the sum of the preset value and the compensation quantity; for spinning of two or more steps, measuring the wall thickness range according to the test spinning, calculating the average value of the wall thickness, reversely calculating the thin-wall section between the steps, and simultaneously ensuring the center distance of the steps;
4) and (4) performing stress relief annealing on the cylinder obtained by spinning.
2. The reverse spinning method of the ultra-high strength steel outer step thin-wall cylinder according to claim 1, characterized in that: the spinning blank adopts a structural seamless steel pipe, and the mechanical property after heat treatment meets the condition that Rm is more than or equal to 1520MPa and A is more than or equal to 9 percent.
3. The reverse spinning method of the ultra-high strength steel outer step thin-wall cylinder according to claim 1, characterized in that: the deviation of the outer diameter dimension of the blank in the step 2) is +/-0.05 mm, the deviation of the inner diameter dimension is +/-0.05 mm, and the axial wall thickness deviation and the radial wall thickness deviation of the blank are both less than +/-0.03 mm.
4. The reverse spinning method of the ultra-high strength steel outer step thin-wall cylinder according to claim 1, characterized in that: and 3) carrying out two-pass reverse spinning forming on the blank, wherein the wall thickness is spun from 6.2mm to 3.4mm in the first pass, the pass reduction rate is 45.2%, the wall thickness of the second pass is spun to the size 1.20-1.35 mm required by the design, the pass reduction rate is 64.7%, and the total reduction rate is 80.6%.
5. The reverse spinning method of the ultra-high strength steel outer step thin-wall cylinder according to claim 1, characterized in that: the core die material for spin forming is CrWMn, an integral quenching method is adopted, the hardness is HRC 58-62, the roughness of the working surface is higher than 0.8 mu m, the roundness of the core die is not more than 0.02mm, the straightness of the whole length of the core die is not more than 0.02mm, and the installation run-out of the core die is not more than 0.05 mm.
6. The reverse spinning method of the ultra-high strength steel outer step thin-wall cylinder according to claim 1, characterized in that: in the spinning forming, the clearance between the spun workpiece and the core die is controlled within 0.10 mm.
7. The reverse spinning method of the ultra-high strength steel outer step thin-wall cylinder according to claim 1, characterized in that: in the spinning forming, a three-spinning-wheel numerical control powerful spinning machine is used, a X1 spinning wheel seat and an X2 spinning wheel seat are assembled with a double-cone spinning wheel, and an X3 spinning wheel seat is assembled with a step spinning wheel; for spinning ultrahigh-strength steel D6AC, selecting a spinning wheel working angle of 20 degrees, a withdrawal angle of 46 degrees, a step spinning wheel polishing angle of 3 degrees and taking r as a radius of a double-cone spinning wheel filletρR is taken from round corner radius of step rotary wheel as 8mmρ6 mm; the rotation speed of a main shaft of the first pass is 150rpm, the feed speed of a spinning wheel is 110mm/min, the feed rate is 0.73, the screw-down quantity of an X1 spinning wheel is 4.5mm, the screw-down quantity of an X2 spinning wheel is 3.5mm, and the screw-down quantity of an X3 spinning wheel is 2.5 mm; the rotation speed of a main shaft of the second pass is 150rpm, the feeding speed of a spinning wheel is 70mm/min, the feeding rate is 0.47, the screw-down amount of an X1 spinning wheel is 1.6mm, the screw-down amount of an X2 spinning wheel is 0.95mm, and the screw-down amount of an X3 spinning wheel is 0.35 mm.
8. The reverse spinning method of the ultra-high strength steel outer step thin-wall cylinder according to claim 1, characterized in that: and 4) preserving the temperature of the spinning cylinder for 4 hours at 400 ℃, and eliminating partial spinning stress.
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| CN106552852B (en) * | 2016-12-02 | 2019-03-19 | 西安航天动力机械厂 | A kind of reversed spinning processing method of Small Taper cylindrical member |
| CN106903204B (en) * | 2017-01-22 | 2018-06-26 | 湖北三江航天江北机械工程有限公司 | Multi-angle conical shell rotary press modelling method |
| CN108500108B (en) * | 2017-02-27 | 2020-01-21 | 湖北三江航天红阳机电有限公司 | Spinning tool and forming method for cylinder with inner circumferential ribs |
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