CN111644552B - Forging method of multistage step roller with cone frustum - Google Patents

Forging method of multistage step roller with cone frustum Download PDF

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Publication number
CN111644552B
CN111644552B CN202010548531.XA CN202010548531A CN111644552B CN 111644552 B CN111644552 B CN 111644552B CN 202010548531 A CN202010548531 A CN 202010548531A CN 111644552 B CN111644552 B CN 111644552B
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forging
furnace
anvil
upsetting
roller
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CN111644552A (en
Inventor
牛震
刘鹏宇
雷玉臣
郑福胜
孟祥英
赵晓君
刘占东
蒋伟斌
黄宪军
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Jianlong Beiman Special Steel Co ltd
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Jianlong Beiman Special Steel Co ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21JFORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/002Hybrid process, e.g. forging following casting
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B27/00Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/02Shape or construction of rolls
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21JFORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J13/00Details of machines for forging, pressing, or hammering
    • B21J13/06Hammers tups; Anvils; Anvil blocks
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21JFORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/06Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21JFORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/06Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
    • B21J5/08Upsetting
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21JFORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J9/00Forging presses
    • B21J9/10Drives for forging presses
    • B21J9/12Drives for forging presses operated by hydraulic or liquid pressure
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21KMAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K29/00Arrangements for heating or cooling during processing

Abstract

A forging method of a multistage step roller with a cone frustum belongs to the technical field of multistage step roller preparation. The invention aims to solve the technical problem of improving the primary qualified rate and quality of forgings. The process flow of the invention is steel ingot heating → pressing jaw → first upsetting → first drawing long circular blank → second upsetting → second drawing long circular blank → third drawing long circular blank → semi-die forging with special upper anvil → pressing platform, finishing each part to the finished product size → heat treatment, the special upper anvil is upper flat slope anvil, the angle of the bottom edge of the upper flat slope anvil from the horizontal plane is less than or equal to the angle of the conical platform of the multi-stage step roller with the conical platform, the forging method adopts 30MN hydraulic press to forge, and the weight of the steel ingot is 10.3 tons. The forging has better metal streamline, and the one-time qualification rate reaches more than 95%. The forging method is used for forging the multistage step roller.

Description

Forging method of multistage step roller with cone frustum
Technical Field
The invention belongs to the technical field of preparation of multi-stage step rolls; in particular to a forging method of a multistage step roller with a cone frustum.
Background
Free forging is a process of obtaining a forged part by plastically deforming a metal blank on an anvil or between upper and lower anvil blocks of a forging press using impact force or pressure. Compared with the casting product, the free forging not only can eliminate the defects of shrinkage cavity, looseness, air holes and the like which are possibly brought by the casting product, but also can refine crystal grains and improve the mechanical property of the product. The free forging is to control the shape and size of the forged piece by manual operation, so the precision of the forged piece is low, the machining allowance is large, the labor intensity is high, and the production rate is not high, therefore, the free forging is mainly applied to single-piece and small-batch production. In the field of free forging, only simple structural parts such as circles, squares (squares and flat squares), cones, cakes and the like can be forged. The forged piece on the engineering machinery with the cone or the circular truncated cone and the like can only be forged into a material and then is cold-processed into the forged piece with the cone or the circular truncated cone, so that raw materials are greatly wasted.
At present, the domestic production technical scheme for forging the forged piece with the cone or the circular truncated cone is to adopt steel ingots → heating, forging → normalizing, annealing and processing and forming. The forging with the cone or the circular truncated cone mainly has a forming mode: forging the cone or the round table into a cylinder. The forming method has the main problems of large forging allowance and long time for subsequent machining, and the raw materials are seriously wasted.
Disclosure of Invention
The invention aims to provide a forging method of a multistage step roller with a truncated cone, which improves the primary qualified rate and quality of a forge piece and reduces the forging allowance.
The invention is realized by the following technical scheme:
the forging method of the multistage step roller with the cone frustum comprises the process flows of steel ingot heating → pressing jaw → first upsetting → first long round blank drawing → second upsetting → second long round blank drawing → third long round blank drawing → carrying out half die forging → pressing the platform and finishing the size of each part → heat treatment by using a special upper anvil, wherein the special upper anvil is an upper flat-slope anvil, and the angle between the bottom edge of the upper flat-slope anvil and the horizontal plane is less than or equal to the angle of the cone frustum of the multistage step roller with the cone frustum.
The forging method of the multistage step roller with the cone frustum is characterized in that a 30MN hydraulic press is adopted for forging, the weight of a steel ingot is 10.3 tons, the steel ingot is placed into a gas heating furnace for heating at the temperature of 1190-1210 ℃ for 9-15 hours, and then a jaw is pressed on the steel ingot.
The forging method of the multistage step roller with the cone frustum is characterized in that a steel ingot with a pressure jaw is returned to a furnace and heated, then primary upsetting is carried out, the temperature for returning to the furnace is 1190-1210 ℃, the heat preservation time is 3-6 hours, the primary upsetting is carried out by an upsetting platform, the upsetting is carried out until the diameter is 1105-1320 mm, and the upsetting ratio is 1.4-2.0. The steel ingot deforms through upsetting, the forging ratio is increased, positive and negative segregation existing in the steel ingot can be effectively destroyed, and meanwhile, the deformation of a core is increased.
The forging method of the multi-step roller with the cone frustum comprises the steps of returning the steel ingot subjected to the first upsetting to a furnace, heating, then drawing an oblong blank for the first time, wherein the temperature of the steel ingot returned to the furnace is 1190-1210 ℃, the heat preservation time is 3-5 hours, the first drawing of the oblong blank adopts upper flat and lower flat anvils, and the steel ingot subjected to the first upsetting is drawn into the oblong blank with the diameter of 940mm and the single reduction of 60-80 mm.
The forging method of the multi-step roller with the cone frustum is characterized in that a steel ingot after long circular blanks are drawn for the first time is returned to a furnace for heating and then subjected to secondary upsetting, the temperature of the steel ingot returned to the furnace is 1190-1210 ℃, the heat preservation time is 3-4 hours, the steel ingot is subjected to secondary upsetting to the diameter of 1110-1320 mm, and the upsetting ratio is 1.4-2.0.
The forging method of the multi-step roller with the cone frustum comprises the steps of returning the steel ingot subjected to secondary upsetting to a furnace, heating, then drawing the long round blank for the second time, wherein the temperature of the steel ingot returned to the furnace is 1190-1210 ℃, the heat preservation time is 3-4 hours, the steel ingot subjected to secondary drawing adopts an upper flat anvil and a lower flat anvil, and the steel ingot subjected to upsetting is drawn to the diameter of 940 mm. The single rolling reduction is 60-80 mm. The rolling reduction of the round blank drawn out for the second time is not too large, the purpose is to prevent cracks from occurring inside, internal air holes can be welded, the carbide is loosened and broken, the core material is increased, and the internal quality of the product is improved.
The forging method of the multi-step roller with the cone frustum is characterized in that an ingot subjected to secondary long circular blank drawing is returned to a furnace for heating, then long circular blank drawing is carried out for the third time, the temperature for returning to the furnace is 1190-1210 ℃, the heat preservation time is 1-2 hours, an upper flat anvil and a lower flat anvil are adopted for the third round blank drawing, the diameter of the upset ingot is 740mm, and the single reduction is 60-80 mm. The third round billet is drawn out and is pressed down the volume and should not too big, and the purpose is to prevent inside crackle, can weld inside gas pocket, loose, broken carbide simultaneously, increases the core and walks to expect to improve product internal quality.
The forging method of the multi-step roller with the cone frustum is characterized in that an ingot after a long circular blank is drawn for the third time is subjected to furnace returning heating, then semi-die forging is carried out by using a special upper anvil, the furnace returning heating temperature is 1190-1210 ℃, the heat preservation time is 1-2 h, then the ingot is synchronously forged to the conical round table at a specified point position through an operating machine and a forging piece, and the single rolling reduction is 60-80 mm. By adopting the special upper anvil to perform half die forging, the metal streamline of the forge piece is better, the primary qualified rate reaches more than 95%, and the forging allowance of the forge piece is reduced.
The forging method of the multistage step roller with the cone frustum comprises the steps of performing furnace return heating on steel ingots after semi-die forging by using a special upper anvil, pressing platforms and finishing all parts to the finished product size, performing furnace return heating at the temperature of 1190-1210 ℃ for 1-2 hours, and then pressing platforms to the finished product size by using an upper flat anvil, a lower flat anvil or an upper flat slope anvil and a lower flat anvil.
The forging method of the multistage step roller with the truncated cone comprises the steps of pressing the truncated cone, finishing each part to the size of a finished product, air-cooling a forged piece to 400-500 ℃, putting the forged piece into a heat treatment furnace for normalizing at 950-970 ℃, and keeping the temperature for 12 hours. The heat treatment can refine the grains. And the annealing of dehydrogenation and stress relief reduces the forging stress, reduces the hardness of the forged piece and is beneficial to subsequent processing.
According to the forging method of the multistage step roller with the cone frustum, due to the design of the forging deformation process, the manipulator and the flat anvil need to be paid attention to move synchronously to forge the roller to the cone during half die forging, and compared with the original process, the process saves the raw material amount by at least 0.5 ton, improves the core quality, reduces the process weight of a forging blank and reduces the manufacturing cost.
The forging method of the multistage step roller with the circular truncated cone optimizes the forging forming process, develops the manufacturing method of the integrally forged piece with the circular truncated cone or the circular truncated cone, enables the metal flow line of the forged piece to be better, enables the primary qualified rate to reach more than 95%, reduces the forging allowance of the forged piece, reduces the manufacturing cost, reduces the operation difficulty, improves the production efficiency, improves the production environment and realizes batch production.
Drawings
FIG. 1 is a schematic structural diagram of a multi-step roller with a truncated cone prepared by the present invention;
FIG. 2 is a front view of a specialized upper anvil of the present invention;
FIG. 3 is a left side view of a specialized upper anvil according to the present invention;
FIG. 4 is a schematic structural view of a multi-step roll manufactured in a comparative example;
FIG. 5 is a partially enlarged photograph of a multi-step roll real object with a truncated cone prepared by a method according to an embodiment of the present invention;
FIG. 6 is a left side photograph of the multi-step roll real object with a truncated cone prepared by the second method according to the embodiment of the present invention;
FIG. 7 is a schematic structural view of a multi-step roll with a truncated cone prepared by the present invention;
FIG. 8 is a process flow diagram of the present invention.
Detailed Description
The first embodiment is as follows:
the forging method of the multi-step roller with the cone frustum comprises the process flows of steel ingot heating → pressing jaw → first upsetting → first long round blank drawing → second upsetting → second long round blank drawing → third long round blank drawing → carrying out half die forging with a special upper anvil → pressing the platform and finishing the size of each part → heat treatment, wherein the special upper anvil is an upper flat-slope anvil, and the angle between the bottom edge of the upper flat-slope anvil and the horizontal plane is equal to the angle of the cone frustum of the multi-step roller with the cone frustum.
In the forging method of the multistage step roller with the truncated cone according to the embodiment, a 30MN hydraulic press is used for forging, and the weight of a steel ingot is 10.3 tons.
In the forging method of the multistage step roller with the truncated cone according to the embodiment, a steel ingot is put into a gas heating furnace to be heated at the temperature of 1190 ℃ for 15 hours, and then a nip is pressed on the steel ingot.
In the forging method of the multi-step roller with the cone frustum, the steel ingot of the pressure jaw is returned to the furnace and heated, then the first upsetting is carried out, the temperature of the returned furnace is 1190 ℃, the heat preservation time is 3 hours, the first upsetting is carried out by the upsetting platform, the upsetting is carried out until the diameter is 1105mm, and the upsetting ratio is 1.4.
In the forging method of the multi-step roller with the cone frustum, the ingot subjected to the first upsetting is returned to the furnace and heated, then the long round blank is drawn for the first time, the temperature of the returned furnace is 1190 ℃, the heat preservation time is 5 hours, the upper flat anvil and the lower flat anvil are adopted for the first round blank drawing, the diameter of the ingot subjected to the first upsetting is 940mm, and the single reduction is 68 mm.
In the forging method of the multi-step roller with the truncated cone according to the embodiment, the steel ingot after the long circular blank is drawn for the first time is returned to the furnace for heating and then is subjected to secondary upsetting, the temperature of the returned furnace is 1190 ℃, the heat preservation time is 4 hours, the secondary upsetting is carried out until the diameter is 1110mm, and the upsetting ratio is 1.4.
In the forging method of the multi-step roller with the truncated cone, the ingot subjected to secondary upsetting is returned to the furnace and heated, then the round blank is drawn for the second time, the temperature of the returned furnace is 1190 ℃, the heat preservation time is 3 hours, the round blank drawn for the second time adopts upper flat anvils and lower flat anvils, and the diameter of the round blank drawn for the ingot subjected to upsetting is 940 mm. The single pressing amount is 60 mm.
In the forging method of the multi-step roller with the cone frustum, the steel ingot after the second drawing of the oblong blank is returned to the furnace for heating, the third drawing of the oblong blank is carried out, the temperature for returning to the furnace is 1190 ℃, the heat preservation time is 1h, the third drawing of the oblong blank adopts upper flat and lower flat anvils, the steel ingot after upsetting is drawn to the diameter of 740mm, and the single reduction is 60 mm.
In the forging method of the multi-step roller with the cone frustum, after the oblong blank is drawn for the third time, the steel ingot is subjected to furnace returning and heating, then the semi-die forging is carried out by using a special upper anvil, the furnace returning and heating temperature is 1190 ℃, the heat preservation time is 2 hours, then the steel ingot is synchronously forged to the cone frustum at the specified point position through an operating machine and a forging piece, and the single reduction is 60 mm.
In the forging method of the multistage step roller with the cone frustum, after steel ingots which are subjected to half die forging by using a special upper anvil are subjected to furnace returning heating, pressing and finishing of all parts to the finished size are performed, the furnace returning heating temperature is 1190 ℃, the heat preservation time is 1h, and then the upper flat-slope anvil and the lower flat-type anvil are adopted for pressing the steel ingots to the finished size.
In the forging method of the multi-step roller with the truncated cone, the forging piece after pressing the truncated cone and finishing each part to the finished size is cooled to 500 ℃ in air, and is put into a heat treatment furnace for normalizing, wherein the normalizing temperature is 950 ℃, and the heat preservation time is 12 hours.
In the forging method of the multistage step roller with the truncated cone, the one-time qualification rate of the multistage step roller with the truncated cone is more than 95% by designing the forging deformation process and utilizing a special tool to match with forging forming.
In the forging method of the multistage step roller with the truncated cone, the forging deformation is formed by two-heading and two-drawing forging, the round running does not go to the square running, the pressing amount cannot be too large, and cracks in the forged piece caused by the deformation amount are prevented. The special upper anvil is used for forging before blanking, and the last fire is used for pressing and finishing, so that the primary qualified rate of the size of the forge piece is improved, the metal fiber streamline of the forge piece is better, the operation is simple, the process weight of the forge piece blank is reduced, the manufacturing cost is reduced, and the batch production can be realized.
Comparative example:
forging a steel ingot, and upsetting a first hot pressing jaw; drawing the second fire into a circle; third, the fire is pulled out; and forging the fourth fire pressing platform until the rest parts of the finished product are finished to the size to obtain the finished product, wherein the finished product is shown in figure 4. Then air cooling is carried out to replace normalizing, heat treatment and processing forming are carried out. The forming method has the main problems of large forging allowance and long time for subsequent machining, and the raw materials are seriously wasted.
The second embodiment is as follows:
the forging method of the multi-step roller with the cone frustum comprises the process flows of steel ingot heating → pressing jaw → first upsetting → first long round blank drawing → second upsetting → second long round blank drawing → third long round blank drawing → carrying out half die forging with a special upper anvil → pressing the platform and finishing the size of each part → heat treatment, wherein the special upper anvil is an upper flat-slope anvil, and the angle between the bottom edge of the upper flat-slope anvil and the horizontal plane is equal to the angle of the cone frustum of the multi-step roller with the cone frustum.
In the forging method of the multistage step roller with the cone frustum, a 30MN hydraulic press is adopted for forging, the weight of a steel ingot is 10.3 tons, the steel ingot is put into a gas heating furnace for heating at 1210 ℃ for 10 hours, and then the steel ingot is pressed against a jaw.
In the forging method of the multi-step roller with the cone frustum, the steel ingot of the pressure jaw is returned to the furnace and heated, then the first upsetting is carried out, the temperature of the returned furnace is 1210 ℃, the heat preservation time is 5 hours, the first upsetting is carried out by the upsetting platform, the upsetting is carried out until the diameter is 1180mm, and the upsetting ratio is 1.6.
In the forging method of the multi-step roller with the cone frustum, the steel ingot subjected to the first upsetting is returned to the furnace and heated, then the steel ingot is subjected to the first long round drawing, the temperature for returning to the furnace is 1210 ℃, the heat preservation time is 5 hours, the steel ingot subjected to the first upsetting is drawn to be 940mm in diameter by adopting an upper flat anvil and a lower flat anvil, and the single rolling reduction is 80 mm.
In the forging method of the multi-step roller with the truncated cone, the steel ingot after the long circular blank is drawn for the first time is returned to the furnace for heating and then is subjected to secondary upsetting, the temperature of the returned furnace is 1210 ℃, the heat preservation time is 4 hours, the secondary upsetting is carried out until the diameter is 1260mm, and the upsetting ratio is 1.8.
In the forging method of the multi-step roller with the truncated cone, the ingot subjected to secondary upsetting is returned to the furnace and heated, then the round blank is drawn for the second time, the temperature of the returned furnace is 1210 ℃, the heat preservation time is 4 hours, the round blank drawn for the second time adopts upper flat anvils and lower flat anvils, and the diameter of the round blank drawn for the ingot subjected to upsetting is 940 mm. The single pressing amount is 80 mm.
In the forging method of the multi-step roller with the cone frustum, the steel ingot after the second drawing of the oblong blank is returned to the furnace for heating, the steel ingot is subjected to third drawing of the oblong blank, the temperature of the furnace returning for heating is 1190 ℃, the heat preservation time is 2 hours, the third drawing of the oblong blank adopts upper flat and lower flat anvils, the steel ingot after upsetting is subjected to drawing of the round blank to the diameter of 740mm, and the single rolling reduction is 80 mm.
In the forging method of the multi-step roller with the cone frustum, after the oblong blank is drawn for the third time, the steel ingot is subjected to furnace returning and heating, then the semi-die forging is carried out by using a special upper anvil, the furnace returning and heating temperature is 1190 ℃, the heat preservation time is 1h, then the steel ingot is synchronously forged to the cone frustum at the specified point position through an operating machine and a forging piece, and the single reduction is 80 mm.
In the forging method of the multistage step roller with the cone frustum, after steel ingots which are subjected to half die forging by using a special upper anvil are subjected to furnace returning heating, pressing and finishing are performed on all parts to reach the finished product size, the furnace returning heating temperature is 1190 ℃, the heat preservation time is 2 hours, and then the upper flat-slope anvil and the lower flat-type anvil are adopted for pressing the steel ingots to reach the finished product size.
In the forging method of the multi-step roller with the truncated cone, the forging piece after pressing the truncated cone and finishing each part to the finished size is cooled to 500 ℃ in air, and is put into a heat treatment furnace for normalizing, wherein the normalizing temperature is 950 ℃, and the heat preservation time is 12 hours.
In the forging method of the multistage step roller with the truncated cone, the one-time qualification rate of the multistage step roller with the truncated cone is more than 95% by designing the forging deformation process and utilizing a special tool to match with forging forming.
In the forging method of the multistage step roller with the truncated cone, the forging deformation is formed by two-heading and two-drawing forging, the round running does not go to the square running, the pressing amount cannot be too large, and cracks in the forged piece caused by the deformation amount are prevented. The special upper anvil is used for forging before blanking, and the last fire is used for pressing and finishing, so that the primary qualified rate of the size of the forge piece is improved, the metal fiber streamline of the forge piece is better, the operation is simple, the process weight of the forge piece blank is reduced, the manufacturing cost is reduced, and the batch production can be realized.
The third concrete implementation mode:
the forging method of the multistage step roller with the cone frustum comprises the process flows of steel ingot heating → pressing jaw → first upsetting → first long round blank drawing → second upsetting → second long round blank drawing → third long round blank drawing → carrying out half die forging → pressing the platform and finishing the size of each part → heat treatment by using a special upper anvil, wherein the special upper anvil is an upper flat-slope anvil, and the angle between the bottom edge of the upper flat-slope anvil and the horizontal plane is less than or equal to the angle of the cone frustum of the multistage step roller with the cone frustum.
In the forging method of the multistage step roller with the cone frustum, a 30MN hydraulic press is adopted for forging, the weight of a steel ingot is 10.3 tons, the steel ingot is put into a gas heating furnace for heating at 1200 ℃, the heat preservation time is 12 hours, and then a jaw is pressed on the steel ingot.
In the forging method of the multi-step roller with the cone frustum, the steel ingot of the pressure jaw is returned to the furnace and heated, then the first upsetting is carried out, the temperature of the returned furnace is 1200 ℃, the heat preservation time is 3 hours, the first upsetting is carried out by the upsetting platform, the upsetting is carried out until the diameter is 1220mm, and the upsetting ratio is 1.7.
In the forging method of the multi-step roller with the cone frustum, the steel ingot subjected to the first upsetting is returned to the furnace and heated, then the steel ingot is subjected to the first long round drawing, the temperature for returning to the furnace is 1200 ℃, the heat preservation time is 3 hours, the steel ingot subjected to the first upsetting is drawn to be long round by adopting upper flat and lower flat anvils, the diameter of the steel ingot subjected to the first upsetting is 940mm, and the single rolling reduction is 70 mm.
In the forging method of the multi-step roller with the truncated cone according to the embodiment, the steel ingot after the long circular blank is drawn for the first time is returned to the furnace for heating and then is subjected to secondary upsetting, the temperature of the returned furnace is 1200 ℃, the heat preservation time is 3 hours, the secondary upsetting is carried out until the diameter is 1260mm, and the upsetting ratio is 1.8.
In the forging method of the multi-step roller with the truncated cone, the ingot subjected to secondary upsetting is returned to the furnace and heated, then the round blank is drawn for the second time, the temperature of the returned furnace is 1200 ℃, the heat preservation time is 3 hours, the round blank drawn for the second time adopts upper flat anvils and lower flat anvils, and the diameter of the round blank drawn for the ingot subjected to upsetting is 940 mm. The single pressing amount is 70 mm.
In the forging method of the multi-step roller with the cone frustum, the steel ingot after the second drawing of the oblong blank is returned to the furnace for heating, the steel ingot is subjected to third drawing of the oblong blank, the temperature for returning to the furnace is 1200 ℃, the heat preservation time is 1h, the third drawing of the oblong blank adopts upper flat and lower flat anvils, the steel ingot after upsetting is subjected to drawing of the round blank to the diameter of 740mm, and the single rolling reduction is 70 mm.
In the forging method of the multi-step roller with the truncated cone, the steel ingot after the long circular blank is drawn for the third time is subjected to furnace returning heating, then semi-die forging is performed by using a special upper anvil, the furnace returning heating temperature is 120 ℃, the heat preservation time is 1-2 hours, then the steel ingot is synchronously forged to the conical truncated cone at the specified point position through an operating machine and a forging piece, and the single reduction is 70 mm.
In the forging method of the multi-step roller with the cone frustum, after steel ingots which are subjected to half die forging by using a special upper anvil are subjected to furnace returning heating, pressing and finishing of all parts to the finished size are performed, the furnace returning heating temperature is 1200 ℃, the heat preservation time is 2 hours, and then the upper flat anvil and the lower flat anvil are adopted for pressing to the finished size.
In the forging method of the multi-step roller with the truncated cone according to the embodiment, a forged piece after pressing and finishing each part to a finished size is subjected to air cooling to 500 ℃, and is put into a heat treatment furnace for normalizing at 960 ℃ for 12 hours.
In the forging method of the multistage step roller with the truncated cone, the one-time qualification rate of the multistage step roller with the truncated cone is more than 95% by designing the forging deformation process and utilizing a special tool to match with forging forming.
In the forging method of the multistage step roller with the truncated cone, the forging deformation is formed by two-heading and two-drawing forging, the round running does not go to the square running, the pressing amount cannot be too large, and cracks in the forged piece caused by the deformation amount are prevented. The special upper anvil is used for forging before blanking, and the last fire is used for pressing and finishing, so that the primary qualified rate of the size of the forge piece is improved, the metal fiber streamline of the forge piece is better, the operation is simple, the process weight of the forge piece blank is reduced, the manufacturing cost is reduced, and the batch production can be realized.
The fourth concrete implementation mode:
the forging method of the multistage step roller with the cone frustum comprises the process flows of steel ingot heating → pressing jaw → first upsetting → first long round blank drawing → second upsetting → second long round blank drawing → third long round blank drawing → carrying out half die forging → pressing the platform and finishing the size of each part → heat treatment by using a special upper anvil, wherein the special upper anvil is an upper flat-slope anvil, and the angle between the bottom edge of the upper flat-slope anvil and the horizontal plane is less than or equal to the angle of the cone frustum of the multistage step roller with the cone frustum.
In the forging method of the multistage step roller with the truncated cone, the one-time qualification rate of the multistage step roller with the truncated cone is more than 95% by designing the forging deformation process and utilizing a special tool to match with forging forming.
In the forging method of the multistage step roller with the truncated cone, the forging deformation is formed by two-heading and two-drawing forging, the round running does not go to the square running, the pressing amount cannot be too large, and cracks in the forged piece caused by the deformation amount are prevented. The special upper anvil is used for forging before blanking, and the last fire is used for pressing and finishing, so that the primary qualified rate of the size of the forge piece is improved, the metal fiber streamline of the forge piece is better, the operation is simple, the process weight of the forge piece blank is reduced, the manufacturing cost is reduced, and the batch production can be realized.
The fifth concrete implementation mode:
according to the fourth specific embodiment, the forging method of the multistage step roller with the cone frustum adopts a 30MN hydraulic press for forging, the weight of the steel ingot is 10.3 tons, the steel ingot is placed into a gas heating furnace for heating at the temperature of 1190-1210 ℃ for 9-15 hours, and then the steel ingot is pressed and clamped in a jaw.
The sixth specific implementation mode:
according to the fourth specific embodiment, in the forging method of the multistage step roller with the cone frustum, the steel ingot with the pressure jaw is returned to the furnace and heated, then primary upsetting is carried out, the temperature for returning to the furnace is 1190-1210 ℃, the heat preservation time is 3-6 hours, the first upsetting is carried out by using an upsetting platform, the upsetting is carried out until the diameter is 1105-1320 mm, and the upsetting ratio is 1.4-2.0.
The seventh embodiment:
according to the fourth specific embodiment, the forging method of the multi-step roller with the cone frustum comprises the steps of returning and heating the steel ingot subjected to the first upsetting to the furnace, then drawing the long round blank for the first time, wherein the temperature of the steel ingot returned to the furnace is 1190-1210 ℃, the heat preservation time is 3-5 hours, the upper flat anvil and the lower flat anvil are adopted for the first drawing the long round blank, the steel ingot subjected to the first upsetting is drawn to the long round blank with the diameter of 940mm, and the single reduction is 60-80 mm.
The specific implementation mode is eight:
according to the fourth specific embodiment, in the forging method of the multi-step roller with the truncated cone, the ingot after the long circular blank is drawn for the first time is returned to the furnace and heated, then the ingot is subjected to secondary upsetting, the temperature of the returned furnace is 1190-1210 ℃, the heat preservation time is 3-4 hours, the secondary upsetting is carried out until the diameter is 1110-1320 mm, and the upsetting ratio is 1.4-2.0.
The specific implementation method nine:
according to the fourth specific embodiment, in the forging method of the multi-step roller with the truncated cone, the ingot subjected to secondary upsetting is returned to the furnace and heated, then the round blank is drawn for the second time, the temperature of the returned furnace is 1190-1210 ℃, the heat preservation time is 3-4 hours, the round blank drawn for the second time is an upper flat anvil and a lower flat anvil, and the ingot subjected to upsetting is drawn to the diameter of 940 mm. The single pressing amount is 60-80 mm.
The detailed implementation mode is ten:
according to the fourth specific embodiment, in the forging method of the multi-step roller with the truncated cone, the steel ingot after the long round blank is drawn for the second time is returned to the furnace for heating, then the long round blank is drawn for the third time, the temperature of the furnace returning for heating is 1190-1210 ℃, the heat preservation time is 1-2 h, the third round blank drawing adopts an upper flat anvil and a lower flat anvil, the steel ingot after upsetting is drawn to be round to the diameter of 740mm, and the single reduction is 60-80 mm.
The concrete implementation mode eleven:
according to the fourth specific embodiment, in the forging method of the multistage step roller with the truncated cone, the steel ingot after the long circular blank is drawn for the third time is subjected to furnace returning heating, then, the semi-forging is carried out by using a special upper anvil, the furnace returning heating temperature is 1190-1210 ℃, the heat preservation time is 1-2 h, then, the steel ingot is synchronously forged to the conical truncated cone at the specified point position through the manipulator and the forge piece, and the single reduction is 60-80 mm.
The specific implementation mode twelve:
according to the fourth specific embodiment, in the forging method of the multistage step roller with the circular truncated cone, the steel ingot after the semi-forging is carried out by using the special upper anvil is returned to the furnace for heating, then the pressing and the finishing are carried out on each part to the finished size, the temperature of the returned furnace is 1190-1210 ℃, the heat preservation time is 1-2 h, and then the pressing and the finishing are carried out by using the upper flat anvil and the lower flat anvil or the upper flat slope anvil and the lower flat anvil to the finished size.
The specific implementation mode is thirteen:
according to the fourth specific embodiment, the forging method of the multistage step roller with the truncated cone comprises the steps of pressing the truncated cone, finishing each part to the finished size, air-cooling the forged piece to 400-500 ℃, putting the forged piece into a heat treatment furnace for normalizing, wherein the normalizing temperature is 950-970 ℃, and the heat preservation time is 12 hours.

Claims (6)

1. A forging method of a multistage step roller with a cone frustum is characterized in that: the forging method of the multistage step roller with the cone frustum comprises the process flows of steel ingot heating → pressing jaw → first upsetting → first drawing of the long circular blank → second upsetting → second drawing of the long circular blank → third drawing of the long circular blank → carrying out half die forging with a special upper anvil → pressing the platform, finishing each part to the size of the finished product → heat treatment, wherein the special upper anvil is an upper flat slope anvil, and the angle of the bottom edge of the upper flat slope anvil from the horizontal plane is not more than the angle of the cone frustum of the multistage step roller with the cone frustum;
returning the steel ingot after the second long circular blank drawing to the furnace for heating, and drawing the long circular blank for the third time, wherein the temperature for returning to the furnace is 1190-1210 ℃, the heat preservation time is 1-2 h, the third round blank drawing adopts an upper flat anvil and a lower flat anvil, the diameter of the third round blank drawing is 740mm, and the single rolling reduction is 60-80 mm;
the steel ingot after the long circular blank is pulled out for the third time is subjected to furnace returning heating, then is subjected to semi-die forging by using a special upper anvil, the furnace returning heating temperature is 1190-1210 ℃, the heat preservation time is 1-2 hours, then is synchronously operated and forged to a cone frustum at a specified point position through an operating machine, and the single rolling reduction is 60-80 mm;
the steel ingot after the semi-forging is carried out by the special upper anvil is returned to the furnace for heating, then the pressing table is carried out, all parts are finished to the finished product size, the temperature for returning to the furnace is 1190-1210 ℃, the heat preservation time is 1-2 h, and then the upper flat anvil and the lower flat anvil or the upper flat slope anvil and the lower flat anvil are adopted for pressing the table to the finished product size;
and (3) pressing the forging piece on a table, finishing each part to the size of a finished product, air-cooling the forging piece to 400-500 ℃, putting the forging piece into a heat treatment furnace for normalizing at 950-970 ℃, and keeping the temperature for 12 hours.
2. The forging method of a multistage stepped roll having a truncated cone according to claim 1, wherein: the forging method of the multistage step roller with the cone frustum adopts a 30MN hydraulic press for forging, the weight of a steel ingot is 10.3 tons, the steel ingot is heated by putting the steel ingot into a gas heating furnace for heating at the temperature of 1190-1210 ℃ for 9-15 hours, and then a nip is pressed on the steel ingot.
3. The forging method of a multistage stepped roll having a truncated cone according to claim 1 or 2, wherein: in the forging method of the multistage step roller with the cone frustum, the steel ingot of the pressure jaw is returned to the furnace and heated, and then is subjected to primary upsetting, the temperature of the returned furnace is 1190-1210 ℃, the heat preservation time is 3-6 hours, the primary upsetting is carried out by using an upsetting platform, the upsetting is carried out until the diameter is 1105-1320 mm, and the upsetting ratio is 1.4-2.0.
4. The forging method of a multistage stepped roll having a truncated cone according to claim 1 or 2, wherein: in the forging method of the multi-step roller with the cone frustum, the steel ingot subjected to the first upsetting is returned to the furnace and heated, then the long round blank is drawn for the first time, the temperature for returning to the furnace is 1190-1210 ℃, the heat preservation time is 3-5 hours, the long round blank drawn for the first time adopts an upper flat anvil and a lower flat anvil, the diameter of the long round blank drawn for the first time is 940mm, and the single reduction is 60-80 mm.
5. The forging method of a multistage stepped roll having a truncated cone according to claim 1 or 2, wherein: in the forging method of the multistage step roller with the cone frustum, the steel ingot after the first drawing of the long circular blank is returned to the furnace for heating and then is subjected to secondary upsetting, the temperature of the returned furnace is 1190-1210 ℃, the heat preservation time is 3-4 h, the secondary upsetting is carried out until the diameter is 1110-1320 mm, and the upsetting ratio is 1.4-2.0.
6. The forging method of a multistage stepped roll having a truncated cone according to claim 1 or 2, wherein: in the forging method of the multi-step roller with the cone frustum, the steel ingot subjected to secondary upsetting is returned to the furnace and heated, then the long circular blank is drawn for the second time, the temperature for returning to the furnace is 1190-1210 ℃, the heat preservation time is 3-4 hours, the round blank drawn for the second time adopts an upper flat anvil and a lower flat anvil, the diameter of the long circular blank drawn for the second time is 940mm, and the single reduction is 60-80 mm.
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