CN110479924B - Production line type manufacturing method of large-scale ring forging - Google Patents
Production line type manufacturing method of large-scale ring forging Download PDFInfo
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- CN110479924B CN110479924B CN201910789055.8A CN201910789055A CN110479924B CN 110479924 B CN110479924 B CN 110479924B CN 201910789055 A CN201910789055 A CN 201910789055A CN 110479924 B CN110479924 B CN 110479924B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H1/00—Making articles shaped as bodies of revolution
- B21H1/06—Making articles shaped as bodies of revolution rings of restricted axial length
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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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
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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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
- C21D9/40—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rings; for bearing races
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Abstract
The invention discloses a production line type manufacturing method of a large-scale ring forging, which comprises the following steps: blanking → rotary heating → forging and rolling a ring → deformation quenching → water immersion flaw detection → tempering → machining. The manufacturing method can stabilize and excellent the performance of the ring forging, reduce the production cost, improve the production efficiency and facilitate the realization of automation.
Description
Technical Field
The invention relates to the field of ring forging manufacturing methods, in particular to a production line type manufacturing method of a large ring forging.
Background
The SCM440 or 4140 steel is commonly used for manufacturing ring forgings, and the existing ring forgings with large yield are made of the SCM440 or 4140 steel, the weight of the ring forgings does not exceed 6500Kg, the thickness of the ring forgings is 150-600 mm, and the height of the ring forgings is 70-400 mm; the existing manufacturing method of the large-scale ring forging has low production efficiency and can not meet the increasing requirements of the ring forging.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the production line type manufacturing method of the large-scale ring forging piece can ensure that the ring forging piece has stable and excellent performance, lower production cost and higher production efficiency.
In order to solve the problems, the technical scheme adopted by the invention is as follows: the method for manufacturing the large-scale ring forging in an assembly line mode comprises the following steps: blanking → rotary heating → forging and rolling a ring → deformation quenching → water immersion flaw detection → tempering → machining;
(1) in the blanking process: the steel grade of the blanking steel material is SCM440 or 4140;
(2) in the rotary heating process: an automatic rotary heating furnace is adopted to heat the billet obtained by blanking, seven heating zones with gradually increased temperature are sequentially divided from the top to the bottom of the automatic rotary heating furnace, and the seven heating zones are sequentially and respectively as follows: a preheating section zone: heating at 600-900 ℃ in a first zone: heating at 800-1100 ℃, in a second heating area: heating at 900-1150 deg.c for three areas: 1000-1150 ℃, soaking zone: 1000-1180 ℃, second soaking zone: 1100-1180 ℃, three zones of soaking: 1150 ℃ to 1180 ℃; the billet gets into from automatic rotary heating furnace feed inlet, then passes through each zone of heating in proper order after the heating, leaves from the discharge gate of automatic rotary heating furnace again, and wherein the heating time of billet in each zone of heating is: a preheating section zone: heating for 2.5-4.5 h in a first zone: 2-3 h, heating a second zone: 1-2 h, heating three areas: 1-2 h, soaking in a first area: 1-2 h, second soaking zone: 0.5-1 h, three soaking zones: 0.5-1 h;
(3) in the deformation quenching process: after the ring forging is rolled, hoisting the ring forging into a quenching bath, and performing water-cooling quenching on the ring forging by using the waste heat after forging; a rollgang for conveying the ring forgings backwards is arranged in the quenching bath, each ring forging can be sequentially lifted to the rollgang to be immersed in water for quenching during quenching, each ring forging can also be conveyed backwards by the rollgang so as to carry out pipelined quenching on each ring forging, each ring forging can be lifted away from the quenching bath after quenching is finished, a plurality of stirrers arranged along the front and back directions are respectively arranged at two sides of the quenching bath in the length direction, the heat exchange water flow speed around the ring forging on the rollgang can be adjusted after the stirrers are stirred, so that the water cooling speed of the ring forging can be adjusted, a plurality of temperature sensors for detecting the water temperature around the ring forging are arranged around the rollgang, when the temperature sensors detect that the water temperature at a certain position is too high due to quenching, the stirrers corresponding to the position can automatically strengthen stirring so as to accelerate the water flow speed and reduce the temperature, a heat exchanger is arranged on the outer side of the quenching bath, and water in the quenching bath can be circularly conveyed to the heat exchanger by a circulating pump for heat exchange and temperature reduction so as to control the overall temperature of the water in the quenching bath; through stirring of the stirrer and pumping of the circulating pump, the average water flow speed of the center of the quenching tank is kept at 0.4-3 m/s, and the average water flow speed of the position 500mm away from the wall of the quenching tank is kept at 0.15-0.4 m/s; changing water in the quenching bath to ensure that the turbidity of the quenching bath is less than or equal to 20NTU and the pH value is kept between 6.5 and 9.5;
a. when D is more than 2.4m and less than or equal to 2.8m, controlling the temperature of the ring forging to be 840-880 ℃ before the ring forging is immersed in water for quenching, wherein the initial water temperature before the ring forging is immersed in water is less than or equal to 30 ℃, the total temperature of water in a quenching pool is required to be kept at less than or equal to 40 ℃, the temperature of the ring forging is less than or equal to 60 ℃ when the water is discharged, and the temperature of the ring forging is less than or equal to 70 ℃ when the water is discharged for returning to the temperature for 2.5;
b. when D is more than 2.8m and less than or equal to 3.4m, controlling the temperature of the ring forging to be 840-880 ℃ before the ring forging is immersed in water for quenching, wherein the initial water temperature before the ring forging is immersed in water is less than or equal to 30 ℃, the total temperature of water in a quenching pool is required to be kept at less than or equal to 40 ℃, the temperature of the ring forging is less than or equal to 50 ℃ when the water is discharged, and the temperature of the ring forging is less than or equal to 60 ℃ when the water is discharged for returning to the temperature for 2.5;
c. when D is more than 3.4m and less than or equal to 4m, controlling the temperature of the ring forging to be 840-880 ℃ before entering water, then quenching the ring forging of the ring forging in water, wherein the initial water temperature before entering water is less than or equal to 30 ℃, the total temperature of water in a quenching pool is required to be kept at less than or equal to 30 ℃ during quenching, the temperature of the ring forging is less than or equal to 40 ℃ during water outlet, and the temperature of the ring forging is less than or equal to 50 ℃ during water outlet temperature return for 2.5 minutes;
d. when D is more than 4m and less than or equal to 5m, controlling the temperature of the ring forging to be 840-880 ℃ before entering water, then quenching the ring forging in water, wherein the initial water temperature before entering water is less than or equal to 30 ℃, the total temperature of water in a quenching pool is required to be kept at less than or equal to 40 ℃, the temperature of the ring forging is less than or equal to 30 ℃ when leaving water, and the temperature of the ring forging is less than or equal to 40 ℃ when leaving water for returning to the temperature for 2.5 minutes;
d is the outer diameter of the ring forging to be manufactured;
(4) the water immersion method flaw detection process comprises the following steps: hoisting the quenched ring forging into a static water stopping tank, accurately scanning the upper end surface and the outer diameter profile of the ring forging at a set scanning speed by an ultrasonic probe through a high-precision positioning sensor by a truss type flaw detection robot arranged above the static water stopping tank, simultaneously recording the waveform by a main control system, and finding out a defective ring forging through the waveform;
(5) in the tempering procedure: hoisting and transferring the ring forging with qualified flaw detection by the water immersion method to a tempering transfer platform, placing a cushion block below the ring forging, and carrying out laser coding on the ring forging so as to trace, wherein the time interval between quenching and tempering is not more than 2 h; and (3) when the ring forging is charged, the temperature in the furnace is less than or equal to 400 ℃, after the charging is finished, the temperature in the furnace is raised to the temperature of 600-.
Further, the method for manufacturing the large-scale ring forging in an assembly line manner comprises the following steps: and transferring the rolled ring forging to a quenching bath for quenching through a transfer roller way with a manipulator and a truss manipulator.
Further, the method for manufacturing the large-scale ring forging in an assembly line manner comprises the following steps: the stirrers on the two sides of the quenching bath in the length direction are sequentially arranged in a staggered manner.
Further, the method for manufacturing the large-scale ring forging in an assembly line manner comprises the following steps: the automatic rotary heating furnace adopts heat accumulating type oxygen-deficient combustion.
Further, the method for manufacturing the large-scale ring forging in an assembly line manner comprises the following steps: in the ring forging and rolling process, an automatic hydraulic press is adopted to perform cogging on the steel billet and an automatic ring rolling mill is adopted to perform ring rolling on the steel billet; the production rhythm of the automatic ring rolling machine is taken as the whole line control rhythm, and the automatic hydraulic machine and the automatic rotary heating furnace carry out production operation according to the production rhythm of the automatic ring rolling machine; the MES system sends a formula number and a tracing number to equipment in each process through the master control PLC to ensure the continuous automatic production of a production line; equipment in each process can send equipment data and production data to an MES (manufacturing execution system) to realize overall production line monitoring and management; the network communication among all process equipment adopts a field industrial bus to ensure the stability of signal transmission and ensure that all process equipment produces according to the process requirements.
The invention has the advantages that: the production line type manufacturing method of the large-scale ring forging adopts the automatic rotary heating furnace with accurate multi-zone temperature control to heat, so that each steel ingot is in the same heated state at each stage in the whole heating process, and the internal and external temperatures of the steel ingot can be ensured to be consistent when the steel ingot is discharged from the furnace; during quenching, a translation operation mode of a conveying roller way is adopted, so that the quenching process in a free state is completed in the translation transfer process of the ring forging to the next process in water, thereby realizing the water-flowing quenching of the ring forging and greatly improving the production efficiency; the quenching tank adopts a stirring system and an integral circulating heat exchange cooling system which are arranged in a staggered way, so that the local water temperature and the integral water temperature of the water tank can meet the quenching requirement of the ring forging; meanwhile, environmental parameters such as water temperature, water flow speed, water turbidity, pH value and the like in the water tank are detected on line, so that each ring forging is ensured to be in a consistent quenching state, and the quality stability of each ring forging product is ensured; the water immersion method ultrasonic flaw detection is carried out, the precise positioning, the rapid scanning, the intelligent recording and the automatic alarming functions of a truss type intelligent ultrasonic flaw detection robot are utilized to complete the rapid and precise diagnosis of the defects of the ring forging on a flow production line, and the internal quality of the product is ensured; the ring forging is quenched by using the waste heat after forging, so that the waste heat after forging cannot be wasted, the production cost can be reduced, the ring forging does not need to be reheated for quenching, the production time can be greatly reduced, and the production efficiency can be improved.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
The method for manufacturing the large-scale ring forging in an assembly line mode comprises the following steps: blanking → rotary heating → forging and rolling a ring → deformation quenching → water immersion flaw detection → tempering → machining;
(1) in the blanking process: cutting the steel material by using a numerical control sawing machine, wherein the steel grade of the steel material is SCM440 or 4140;
(2) in the rotary heating process: an automatic rotary heating furnace is adopted to heat the billet obtained by blanking, the billet obtained by blanking is conveyed by a conveying roller way, then the billet is hoisted to a feed inlet of the automatic rotary heating furnace by a manipulator, the automatic rotary heating furnace adopts heat accumulation type oxygen-deficient combustion, seven heating zones with gradually increased temperature are sequentially divided from the top to the bottom of the automatic rotary heating furnace, and the seven heating zones are sequentially respectively: a preheating section zone: heating at 600-900 ℃ in a first zone: heating at 800-1100 ℃, in a second heating area: heating at 900-1150 deg.c for three areas: 1000-1150 ℃, soaking zone: 1000-1180 ℃, second soaking zone: 1100-1180 ℃, three zones of soaking: 1150 ℃ to 1180 ℃; the billet gets into from automatic rotary heating furnace feed inlet, then passes through each zone of heating in proper order after the heating, leaves from the discharge gate of automatic rotary heating furnace again, and wherein the heating time of billet in each zone of heating is: a preheating section zone: heating for 2.5-4.5 h in a first zone: 2-3 h, heating a second zone: 1-2 h, heating three areas: 1-2 h, soaking in a first area: 1-2 h, second soaking zone: 0.5-1 h, three soaking zones: 0.5-1 h;
(3) in the ring forging and rolling process: firstly, cogging a steel billet by adopting an automatic hydraulic press, and then rolling the steel billet into a ring by adopting an automatic ring rolling machine; hoisting the rotationally heated steel billet to an automatic hydraulic press by a manipulator, and placing the steel billet in an automatic ring rolling machine by the manipulator hoist after cogging is finished;
(4) in the deformation quenching process: after the ring forging is rolled, hoisting the ring forging to a quenching bath through a transfer roller way with a manipulator and a truss manipulator, and performing water-cooling quenching on the ring forging by using the waste heat after forging, wherein the transfer roller way with the manipulator and the truss manipulator can be used for better transferring the ring forging; the quenching method is characterized in that a roller conveyor for conveying the ring forging backwards is arranged in a quenching bath, each ring forging is sequentially lifted to the roller conveyor to be immersed in water for quenching during quenching, meanwhile, each ring forging is also conveyed backwards by the roller conveyor so as to carry out pipelined quenching on each ring forging, each ring forging is lifted away from the quenching bath by a manipulator after quenching is finished, a plurality of stirrers arranged along the front and back directions are respectively arranged on two sides of the quenching bath in the length direction, the stirrers on the two sides are sequentially and mutually staggered, the heat exchange water flow speed around the ring forging on the roller conveyor can be adjusted after the stirrers are stirred, the water cooling speed of the ring forging can be adjusted, a plurality of temperature sensors for detecting the water temperature around the ring forging are arranged around the roller conveyor, when the temperature sensors detect that the water temperature at a certain position is too high due to quenching, the corresponding stirrers can be automatically stirred so as to accelerate the water flow speed to reduce the temperature, a heat exchanger is arranged on the outer side of the quenching bath, and water in the quenching bath can be circularly conveyed to the heat exchanger by a circulating pump for heat exchange and temperature reduction so as to control the overall temperature of the water in the quenching bath; through stirring of the stirrer and pumping of the circulating pump, the average water flow speed of the center of the quenching tank is kept at 0.4-3 m/s, and the average water flow speed of the position 500mm away from the wall of the quenching tank is kept at 0.15-0.4 m/s; changing water in the quenching bath to ensure that the turbidity of the quenching bath is less than or equal to 20NTU and the pH value is kept between 6.5 and 9.5;
a. when D is more than 2.4m and less than or equal to 2.8m, controlling the temperature of the ring forging to be 840-880 ℃ before the ring forging is immersed in water for quenching, wherein the initial water temperature before the ring forging is immersed in water is less than or equal to 30 ℃, the total temperature of water in a quenching pool is required to be kept at less than or equal to 40 ℃, the temperature of the ring forging is less than or equal to 60 ℃ when the water is discharged, and the temperature of the ring forging is less than or equal to 70 ℃ when the water is discharged for returning to the temperature for 2.5;
b. when D is more than 2.8m and less than or equal to 3.4m, controlling the temperature of the ring forging to be 840-880 ℃ before the ring forging is immersed in water for quenching, wherein the initial water temperature before the ring forging is immersed in water is less than or equal to 30 ℃, the total temperature of water in a quenching pool is required to be kept at less than or equal to 40 ℃, the temperature of the ring forging is less than or equal to 50 ℃ when the water is discharged, and the temperature of the ring forging is less than or equal to 60 ℃ when the water is discharged for returning to the temperature for 2.5;
c. when D is more than 3.4m and less than or equal to 4m, controlling the temperature of the ring forging to be 840-880 ℃ before entering water, then quenching the ring forging in water, wherein the initial water temperature before entering water is less than or equal to 30 ℃, the total temperature of water in a quenching pool is kept to be less than or equal to 40 ℃, the temperature of the ring forging is less than or equal to 40 ℃ when water is discharged, and the temperature of the ring forging is less than or equal to 50 ℃ when the water is discharged and returns to the temperature for 2.5 minutes;
d. when D is more than 4m and less than or equal to 5m, controlling the temperature of the ring forging to be 840-880 ℃ before entering water, then quenching the ring forging in water, wherein the initial water temperature before entering water is less than or equal to 30 ℃, the total temperature of water in a quenching pool is required to be kept at less than or equal to 40 ℃, the temperature of the ring forging is less than or equal to 30 ℃ when leaving water, and the temperature of the ring forging is less than or equal to 40 ℃ when leaving water for returning to the temperature for 2.5 minutes;
d is the outer diameter of the ring forging to be manufactured;
(5) the water immersion method flaw detection process comprises the following steps: hoisting the quenched ring forging into a static water stopping tank through a manipulator, accurately scanning the upper end surface and the outer diameter profile of the ring forging at a set scanning speed by an ultrasonic probe through a high-precision positioning sensor by a truss type flaw detection robot arranged above the static water stopping tank, simultaneously recording the waveform by a master control system, and finding out a defective ring forging through the waveform;
(6) in the tempering procedure: hoisting and transferring the ring forging with qualified flaw detection by the water immersion method onto a tempering transfer platform through a manipulator, placing a cushion block below the ring forging, and carrying out laser coding on the ring forging so as to trace the ring forging, wherein the time interval between quenching and tempering is not more than 2 h; when the ring forging is charged, the temperature in the furnace is less than or equal to 400 ℃, after the charging is finished, the temperature in the furnace is increased to 600-;
(7) in the machining procedure: hoisting the ring forging to machining equipment through a manipulator, and machining the heat-treated ring forging according to a drawing.
In the embodiment, the production rhythm of the automatic ring rolling mill is taken as the whole line control rhythm, and the automatic hydraulic press and the automatic rotary heating furnace carry out production operation at the production rhythm of the automatic ring rolling mill; an MES (Manufacturing Execution System), namely a Manufacturing enterprise production process Execution System, is also arranged and is a set of production informatization management System facing a Manufacturing enterprise workshop Execution layer; the MES system sends a formula number and a tracing number to equipment in each process through the master control PLC to ensure the continuous automatic production of a production line; equipment in each process can send equipment data and production data to an MES (manufacturing execution system) to realize overall production line monitoring and management; the network communication among all process equipment adopts a field industrial bus to ensure the stability of signal transmission and ensure that all process equipment produces according to the process requirements.
Claims (5)
1. The method for manufacturing the large-scale ring forging in an assembly line mode comprises the following steps: blanking → rotary heating → forging and rolling a ring → deformation quenching → water immersion flaw detection → tempering → machining; the method is characterized in that:
(1) in the blanking process: the steel grade of the blanking steel material is SCM440 or 4140;
(2) in the rotary heating process: an automatic rotary heating furnace is adopted to heat the billet obtained by blanking, seven heating zones with gradually increased temperature are sequentially divided from the top to the bottom of the automatic rotary heating furnace, and the seven heating zones are sequentially and respectively as follows: a preheating section zone: heating at 600-900 ℃ in a first zone: heating at 800-1100 ℃, in a second heating area: heating at 900-1150 deg.c for three areas: 1000-1150 ℃, soaking zone: 1000-1180 ℃, second soaking zone: 1100-1180 ℃, three zones of soaking: 1150 ℃ to 1180 ℃; the billet gets into from automatic rotary heating furnace feed inlet, then passes through each zone of heating in proper order after the heating, leaves from the discharge gate of automatic rotary heating furnace again, and wherein the heating time of billet in each zone of heating is: a preheating section zone: heating for 2.5-4.5 h in a first zone: 2-3 h, heating a second zone: 1-2 h, heating three areas: 1-2 h, soaking in a first area: 1-2 h, second soaking zone: 0.5-1 h, three soaking zones: 0.5-1 h;
(3) in the deformation quenching process: after the ring forging is rolled, hoisting the ring forging into a quenching bath, and performing water-cooling quenching on the ring forging by using the waste heat after forging; a rollgang for conveying the ring forgings backwards is arranged in the quenching bath, each ring forging can be sequentially lifted to the rollgang to be immersed in water for quenching during quenching, each ring forging can also be conveyed backwards by the rollgang so as to carry out pipelined quenching on each ring forging, each ring forging can be lifted away from the quenching bath after quenching is finished, a plurality of stirrers arranged along the front and back directions are respectively arranged at two sides of the quenching bath in the length direction, the heat exchange water flow speed around the ring forging on the rollgang can be adjusted after the stirrers are stirred, so that the water cooling speed of the ring forging can be adjusted, a plurality of temperature sensors for detecting the water temperature around the ring forging are arranged around the rollgang, when the temperature sensors detect that the water temperature at a certain position is too high due to quenching, the stirrers corresponding to the position can automatically strengthen stirring so as to accelerate the water flow speed and reduce the temperature, a heat exchanger is arranged on the outer side of the quenching bath, and water in the quenching bath can be circularly conveyed to the heat exchanger by a circulating pump for heat exchange and temperature reduction so as to control the overall temperature of the water in the quenching bath; through stirring of the stirrer and pumping of the circulating pump, the average water flow speed of the center of the quenching tank is kept at 0.4-3 m/s, and the average water flow speed of the position 500mm away from the wall of the quenching tank is kept at 0.15-0.4 m/s; changing water in the quenching bath to ensure that the turbidity of the quenching bath is less than or equal to 20NTU and the pH value is kept between 6.5 and 9.5;
a. when D is more than 2.4m and less than or equal to 2.8m, controlling the temperature of the ring forging to be 840-880 ℃ before the ring forging is immersed in water for quenching, wherein the initial water temperature before the ring forging is immersed in water is less than or equal to 30 ℃, the total temperature of water in a quenching pool is required to be kept at less than or equal to 40 ℃, the temperature of the ring forging is less than or equal to 60 ℃ when the water is discharged, and the temperature of the ring forging is less than or equal to 70 ℃ when the water is discharged for returning to the temperature for 2.5;
b. when D is more than 2.8m and less than or equal to 3.4m, controlling the temperature of the ring forging to be 840-880 ℃ before the ring forging is immersed in water for quenching, wherein the initial water temperature before the ring forging is immersed in water is less than or equal to 30 ℃, the total temperature of water in a quenching pool is required to be kept at less than or equal to 40 ℃, the temperature of the ring forging is less than or equal to 50 ℃ when the water is discharged, and the temperature of the ring forging is less than or equal to 60 ℃ when the water is discharged for returning to the temperature for 2.5;
c. when D is more than 3.4m and less than or equal to 4m, controlling the temperature of the ring forging to be 840-880 ℃ before the ring forging is immersed in water for quenching, wherein the initial water temperature before the ring forging is immersed in water is less than or equal to 30 ℃, the total temperature of water in a quenching pool is required to be kept at less than or equal to 30 ℃ during quenching, the temperature of the ring forging is less than or equal to 40 ℃ during water outlet, and the temperature of the ring forging is less than or equal to 50 ℃ when the water outlet returns to the temperature for 2.5;
d. when D is more than 4m and less than or equal to 5m, controlling the temperature of the ring forging to be 840-880 ℃ before the ring forging is immersed in water for quenching, wherein the initial water temperature before the ring forging is immersed in water is less than or equal to 30 ℃, the total temperature of water in a quenching pool is required to be kept at less than or equal to 40 ℃, the temperature of the ring forging is less than or equal to 30 ℃ when water is discharged, and the temperature of the ring forging is less than or equal to 40 ℃ when the water is discharged and returns to the temperature for 2.5 minutes;
d is the outer diameter of the ring forging to be manufactured;
(4) the water immersion method flaw detection process comprises the following steps: hoisting the quenched ring forging into a static water stopping tank, accurately scanning the upper end surface and the outer diameter profile of the ring forging at a set scanning speed by an ultrasonic probe through a high-precision positioning sensor by a truss type flaw detection robot arranged above the static water stopping tank, simultaneously recording the waveform by a main control system, and finding out a defective ring forging through the waveform;
(5) in the tempering procedure: hoisting and transferring the ring forging with qualified flaw detection by the water immersion method to a tempering transfer platform, placing a cushion block below the ring forging, and carrying out laser coding on the ring forging so as to trace, wherein the time interval between quenching and tempering is not more than 2 h; and (3) when the ring forging is charged, the temperature in the furnace is less than or equal to 400 ℃, after the charging is finished, the temperature in the furnace is raised to the temperature of 600-.
2. The in-line manufacturing method of large-scale ring forgings according to claim 1, wherein: and transferring the rolled ring forging to a quenching bath for quenching through a transfer roller way with a manipulator and a truss manipulator.
3. The in-line manufacturing method of large-scale ring forgings according to claim 1, wherein: the stirrers on the two sides of the quenching bath in the length direction are sequentially arranged in a staggered manner.
4. The in-line manufacturing method of large-scale ring forgings according to claim 1, wherein: the automatic rotary heating furnace adopts heat accumulating type oxygen-deficient combustion.
5. The in-line manufacturing method of large-scale ring forgings according to claim 1, wherein: in the ring forging and rolling process, an automatic hydraulic press is adopted to perform cogging on the steel billet and an automatic ring rolling mill is adopted to perform ring rolling on the steel billet; the production rhythm of the automatic ring rolling machine is taken as the whole line control rhythm, and the automatic hydraulic machine and the automatic rotary heating furnace carry out production operation according to the production rhythm of the automatic ring rolling machine; the MES system sends a formula number and a tracing number to equipment in each process through the master control PLC to ensure the continuous automatic production of a production line; equipment in each process can send equipment data and production data to an MES (manufacturing execution system) to realize overall production line monitoring and management; the network communication among all process equipment adopts a field industrial bus to ensure the stability of signal transmission and ensure that all process equipment produces according to the process requirements.
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