CN110153186B - Method for preparing high alloy tool and die steel hollow pipe blank, hollow pipe blank and annular cutter - Google Patents

Method for preparing high alloy tool and die steel hollow pipe blank, hollow pipe blank and annular cutter Download PDF

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Publication number
CN110153186B
CN110153186B CN201910379194.3A CN201910379194A CN110153186B CN 110153186 B CN110153186 B CN 110153186B CN 201910379194 A CN201910379194 A CN 201910379194A CN 110153186 B CN110153186 B CN 110153186B
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alloy tool
steel
hollow
die steel
die
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CN110153186A (en
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梁敬斌
张占普
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HEYE SPECIAL STEEL CO LTD
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HEYE SPECIAL STEEL CO LTD
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B1/00Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/46Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
    • B21B1/463Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B3/00Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences Rolling of aluminium, copper, zinc or other non-ferrous metals
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B37/00Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/56Elongation control
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D7/00Casting ingots, e.g. from ferrous metals
    • B22D7/04Casting hollow ingots
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23DPLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D35/00Tools for shearing machines or shearing devices; Holders or chucks for shearing tools
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26Methods of annealing
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D9/00Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0081Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/24Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/26Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B2265/00Forming parameters
    • B21B2265/10Compression, e.g. longitudinal compression

Abstract

The invention provides a method for preparing a high alloy tool and die steel hollow pipe blank, a pipe and an annular cutter. The invention forms a new preparation process of the hollow tube blank of the high-alloy tool and die steel, shortens the manufacturing process flow and can improve the quality, the material utilization rate and the production efficiency.

Description

Method for preparing high alloy tool and die steel hollow pipe blank, hollow pipe blank and annular cutter
Technical Field
The invention relates to the technical field of metallurgy, in particular to a method for preparing a high-alloy tool and die steel hollow pipe blank, and also relates to the high-alloy tool and die steel hollow pipe blank prepared by the preparation method, and a pipe and an annular cutter prepared from the high-alloy tool and die steel hollow pipe blank.
Background
High alloy tool and die steels such as high speed steels M2, M35, M2Al, etc., high carbon chromium cold work die steels Cr12Mo1V1, high toughness and high wear resistance cold work die steels HYC3, etc., and hot work die steels such as H13E, H13, H12, etc., are widely used for manufacturing various cutting tools and various dies including large hollow broach, hob, hollow roll, shield hob, disc shear blade, etc. Because high-alloy tool and die steel contains a large amount of W, Mo, Cr, V and other alloy elements, the solidification components are not uniform during smelting, the segregation is serious, a large amount of carbides are contained, and the specification and the size of a qualified steel ingot are limited, the high-alloy tool and die steel needs to be prepared by a special metallurgical method, and a large thermal deformation amount is needed for crushing so as to improve the distribution state of the high-alloy tool and die steel to enable the high-alloy tool and die steel to have uniform structures required by tools and dies, and the tool and die steel with required.
The traditional hollow tool and die manufacturing method generally adopts the process of hollowing out the core part of a solid bar stock or reaming a solid forging stock into a ring-shaped piece after punching the solid forging stock to prepare the blank, and the methods generally have the defects of time and labor waste, long process route, low yield and qualified rate, low efficiency and the like. Other conventional production methods for lower alloy steel pipes, such as a piercing technology, a three-roll continuous rolling mill steel pipe rolling technology and the like, are difficult to apply to high alloy die steel.
The existing manufacturing method of the hollow tool and the die takes preparation of an H13E shield rolling cutter ring as an example, and the existing process flow is intermediate frequency smelting → ingot obtaining phi 315 by electroslag remelting → fine forging into phi 160 blank → annealing → precise blanking → heating forging → punching → reaming → forging forming → annealing → machining → cutter ring blank inspection → delivery. The shield hobbing cutter ring prepared by the existing process flow has poor core structure of the steel ingot, the material utilization rate is only 53 percent, the preparation process flow is long, and the production efficiency is low.
Because the high alloy tool and die steel has poor technological plasticity, a narrow deformation temperature range, large deformation resistance, large processing difficulty, high time consumption and cost and difficult quality guarantee. Therefore, although it is known that the quality of the hollow high-alloy tool and die steel is improved by adopting the hollow pipe, the production efficiency and the material utilization rate are also greatly improved, but for the reasons, the preparation of the hollow pipe of the high-alloy tool and die steel is always difficult.
Disclosure of Invention
In view of the above, the present invention aims to provide a method for preparing a high alloy tool and die steel hollow shell, so as to provide a new preparation process capable of forming the high alloy tool and die steel hollow shell.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a method for preparing a high-alloy tool and die steel hollow pipe blank comprises the following steps:
a. making the refined high-alloy tool and die steel molten steel into a hollow steel ingot with one closed end;
b. filling the hollow steel ingot with rheological materials meeting the hot forging deformation requirement, tamping the rheological materials, and then closing one end of an opening of the hollow steel ingot, wherein the hot forging deformation requirement comprises that the rheological materials have a melting point higher than the forging heating temperature, do not react with steel materials during heating, do not change the volume of the rheological materials during hot forging deformation, and can generate uniform rheology along with the deformation of the steel ingot;
c. putting the hollow steel ingot filled with the rheological material into a furnace for heating;
d. discharging the heated hollow steel ingot out of the furnace, performing radial forging on the hollow steel ingot on a finish forging machine to obtain a high alloy tool and die steel billet with the diameter meeting the requirement, putting the high alloy tool and die steel billet into the furnace for annealing, and cooling and straightening the annealed high alloy tool and die steel billet;
e. and determining the positions of inner holes at two ends of the high-alloy tool and die steel billet, cutting off the end part of the steel billet at the positions, and removing the filled rheological material to obtain the high-alloy tool and die steel hollow pipe blank.
And further, in the step a, the molten steel is made into a hollow steel ingot by adopting injection molding.
And further, heating according to the cogging heating specification of the corresponding steel grade of the high-alloy tool and die steel in the step c.
Further, the deformation ratio of the hollow steel ingot is not less than 3 when the finish forging machine in the step d performs radial forging.
Furthermore, in the step e, the positions of inner holes at two ends are determined through ultrasonic flaw detection, and two end parts of the steel billet are removed through a band saw.
Further, the rheological material is alundum.
Compared with the prior art, the invention has the following advantages:
according to the preparation method of the high-alloy tool and die steel hollow tube blank, the filling rheological material and the finish forging cogging process are combined to form a new preparation process of the high-alloy tool and die steel hollow tube blank, so that the forging preparation of the high-alloy tool and die steel hollow tube blank is as convenient as the forging preparation of a conventional solid steel ingot, the manufacturing process flow of the high-alloy tool and die steel hollow tube blank can be shortened, the quality is improved, the material utilization rate is improved, and the production efficiency is improved.
The invention also provides a high-alloy tool and die steel hollow pipe blank prepared by the preparation method of the high-alloy tool and die steel hollow pipe blank.
In addition, the invention also provides a high-alloy tool and die steel pipe and an annular cutter.
The high-alloy tool and die steel pipe is obtained by sizing, rolling, flaw detection and finishing the high-alloy tool and die steel hollow pipe blank. The annular cutter is obtained by blanking the high-alloy tool and die steel hollow tube blank and then machining or rolling and die forging the blank.
Still further, the annular cutter may be a disc shear blade obtained by machining, or the annular cutter may be a shield ring obtained by rolling and die forging.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. Meanwhile, as not particularly described, the processing method and the processing equipment adopted in the embodiment are performed according to the process specification of the corresponding steel grade by referring to the conventional processing process in the existing high-alloy tool and die processing.
Example one
The embodiment relates to a preparation method of a high-alloy tool and die steel hollow pipe blank, which specifically comprises the steps of preparing refined high-alloy tool and die steel molten steel into a hollow steel ingot with one closed end by adopting spray forming or other processes, filling rheological materials meeting the hot forging deformation requirement into the prepared hollow steel ingot, tamping the rheological materials, and then closing one open end of the hollow steel ingot. And then, heating the hollow steel ingot filled with the rheological material in a furnace, discharging the hollow steel ingot from the furnace after heating, performing radial forging on a finish forging machine to obtain a high alloy tool and die steel billet with the diameter meeting the requirement, then, feeding the high alloy tool and die steel billet into the furnace for annealing, and cooling and straightening after annealing. And then, determining the positions of inner holes at two ends of the straightened high-alloy tool and die steel billet, cutting off the end part of the steel billet at the positions, and removing the filled rheological material to obtain the high-alloy tool and die steel hollow pipe billet.
The hot forging deformation requirements mentioned in the preparation method comprise that the rheological material has a melting point higher than the forging heating temperature, does not react with steel materials during heating, does not change the volume of the rheological material during hot forging deformation, and can uniformly flow along with the deformation of steel ingots. The uniform rheology is that when the steel ingot filled with the rheological material is radially forged, the rheological material can correspondingly flow along with the lengthening and thinning of the steel ingot due to the change of the length-diameter ratio of the steel ingot caused by forging, so that the whole rheological material is lengthened and thinned, the configuration of the steel ingot after forging change is always kept consistent, and the rheological material is ensured to be in a stable filling and filling state in the steel ingot. In practice, the rheological material can be, for example, alumina (Al)2O3) The particle size of alundum powder is 60-120 μm. Of course, other materials besides alundum may be used for the above-described rheological material that meets the hot forging deformation requirements.
By filling the rheological material meeting the hot forging deformation requirement, the inner wall of the hollow steel ingot can be supported in the subsequent radial forging so as to ensure the shape of the inner hole. And the rheological material meets the requirement of hot forging deformation, and can be easily cleaned from an inner hole after being processed.
In the above preparation method of this embodiment, the hollow steel ingot filled with the rheological material is heated according to the cogging heating specification of the corresponding steel grade of the high-alloy tool and die steel. And the subsequent annealing of the high alloy tool and die steel billet can be carried out according to the annealing process system of the corresponding steel grade. In addition, the heated hollow steel ingot is radially forged on a finish forging machine, the stress on the periphery of the steel ingot is uniform, and the whole rheological material is lengthened along with the unchanged volume and becomes thinner in proportion to the steel ingot under the condition that the steel ingot is drawn out, so that the uniform wall thickness and the inner hole roundness of the steel ingot can be kept through the support of the rheological material during forging.
In this embodiment, the deformation ratio of the ingot of the hollow center steel should be not less than 3, for example, it may be 3, 3.2, 3.5 or 4, 4.5, 5, etc. when the finish forging is performed on the finish forging machine. The high alloy tool and die steel can be quenched completely by air quenching to generate martensite transformation, and the structure stress cracking is easily caused, so that annealing is needed in time after the steel ingot is slowly cooled after the steel ingot is forged on a precision forging machine. After annealing, the steel ingot is straightened, and the steel ingot prepared by the embodiment can keep the shape of the pipe blank without being flattened by the same way as the existing solid steel material during straightening by depending on the supporting effect of the rheological material filled in the steel ingot.
In this embodiment, as a preferred embodiment, the positions of the inner holes at both ends of the steel billet can be determined by ultrasonic flaw detection, where the positions of the inner holes are both ends of the inner hole with the same inner diameter in the steel billet. In addition, when the positions of both ends of the inner hole are determined by ultrasonic flaw detection, it is needless to say that the type and size of the flaw can be determined by simultaneously detecting the flaw on the billet, and the detected flaw positions can be removed together when both ends of the billet are removed. After the inner hole positions at the two ends are determined, the two ends of the steel blank can be removed through a band saw so that the filled rheological material can be exposed at the two ends of the steel blank, and then the prepared tube blank can be obtained by cleaning the rheological material.
Compared with the existing high-alloy tool and die steel pipe preparation method, the preparation method of the embodiment has at least the following advantages.
Firstly, the utilization rate of materials is greatly improved. For example, in the prior art, a forged solid bar is adopted to prepare an undercut broach blank (a longer tube), and a lathe is adopted to machine and undercut an inner hole, so that the utilization rate of steel is low. The hollow ingot can be directly forged, and the hollow ingot with a proper aperture can be designed according to calculation, so that a more proper pipe blank is forged and then processed into an empty broach blank, the material utilization rate is greatly improved, and the inner wall quality is much better than that of a bar directly empty.
And secondly, the process links for preparing the ring product can be reduced. Taking the preparation of the shield hobbing cutter ring as an example, the existing process is that after blanking a solid bar, the solid bar is forged into shapes, then the solid bar is sequentially punched, reamed, swaged or rolled into the hobbing cutter ring, and then the hobbing cutter ring is machined and formed. If the preparation method is adopted to prepare the hollow pipe blank, the process flow is that after the hollow pipe blank is precisely blanked, the hollow pipe blank is reamed, swaged or rolled into a hobbing cutter ring, and then is machined and formed. Compared with the prior art, the invention omits the working procedures of cake forging, punching and reheating, and simultaneously reduces the waste of punching materials, the defects of the inner wall caused by the quality problem of punching and the like.
Thirdly, the preparation method of the embodiment can improve the metallurgical quality of the tube blank and improve the distribution of metallurgical defects, thereby being beneficial to improving the quality and the yield of finished tubes and annular cutters made of the tube blank.
The invention adopts the manufactured hollow ingot, particularly the hollow ingot prepared by spray forming, the tube wall has much smaller solidification size (about 1/4 of the diameter of the solid ingot) than that of the solid ingot with the same diameter, the solidification condition is much better, the metallurgical loose defect is slight in the middle of the tube wall, and simultaneously, the closed defect can be welded in the subsequent tube blank forging process, thereby avoiding the metallurgical defect formed by the solid ingot in a large range at the core part or the opening defect which can be formed at the inner wall of a finished tube or the inner hole of a ring part after punching or hollowing.
The preparation method of this example is further illustrated below by a specific preparation example.
In the preparation example, the preparation of a HYC3 (Cr 8Mo2V2 WSiNb) high-toughness high-wear-resistance cold-work die steel pipe blank is specifically taken as an example, the die steel pipe blank is used for manufacturing a cold-belt edge trimmer disc blade, and the prepared pipe blank has an outer diameter of 240mm and an inner diameter of 105 mm. The process steps are as follows.
The HYC3 molten steel is smelted by adopting an IF + LF refining process, a hollow ingot with the inner diameter phi of 200mm and the outer diameter phi of 500mm and the height of 1500mm is prepared by adopting a spray metallurgy forming process, the upper end of the hollow ingot is closed, the lower end of the hollow ingot is opened, and the prepared hollow ingot is annealed for later use.
Then, the baked aluminum oxide powder is filled into an inner hole of a hollow ingot, tamping is carried out while filling, and after filling, an opening end of the steel ingot is covered by an iron plate and welded firmly to be sealed. And then, heating the hollow ingot filled with the aluminum oxide powder in an SX55 annular furnace at 1150 ℃, preserving heat for 5 hours, forging the hollow ingot out of the furnace into a hollow ingot with the outer diameter of 250 mm on an SX55 precision forging machine, after precision forging, air-cooling the hollow ingot to about 400 ℃, then putting the hollow ingot into an electric annealing furnace for annealing at 880 ℃, preserving heat for 4 hours to 740 ℃, then slowly cooling the hollow ingot to 650 ℃ at the temperature of less than or equal to 10 ℃/hour, then furnace-cooling the hollow ingot to 550 ℃, and air-cooling the hollow ingot out of the furnace.
And then, performing point straightening on the annealed steel ingot on a hydraulic straightening machine, performing ultrasonic flaw detection after the bending degree meets the requirement, determining the end positions of two ends of an inner hole, cutting off the head of the steel ingot by using a band saw to expose the inner hole, then cleaning the aluminum oxide powder in the steel ingot, and detecting that the aperture of the inner hole is about phi 98 mm. Because the powdery aluminum oxide is heated and then forged to be more compact, the space volume occupied by the whole aluminum oxide is reduced, and the reduction ratio of the inner diameter to the outer diameter of the tube blank is slightly larger.
And finally, machining the outer circle and the inner circle of the tube blank by using a lengthened lathe according to the requirement to obtain a finished tube blank with the outer circle phi of 240mm and the inner diameter phi of 105 mm. And through measurement, in the preparation process, the yield of the black skin from the hollow steel ingot to the tube blank is about 82%.
Example two
The embodiment first relates to a high-alloy tool and die steel hollow shell, which is specifically prepared by the preparation method of the high-alloy tool and die steel hollow shell in the first embodiment, and the specific preparation of the high-alloy tool and die steel hollow shell is described in the first embodiment, and is not described herein again.
In addition, the embodiment also relates to a high alloy tool and die steel pipe and an annular cutter.
The high alloy tool and die steel pipe material of the embodiment is obtained by sizing, rolling, flaw detection and finishing the high alloy tool and die steel hollow pipe blank. The annular cutter is obtained by blanking the high-alloy tool and die steel hollow pipe blank and then machining or rolling and die forging, wherein the machined annular cutter can be a disc shear blade, and the rolled annular cutter can be a shield hob ring.
The high-alloy tool and die steel hollow pipe blank of the embodiment adopts the preparation method in the first embodiment, is suitable for manufacturing a thick-wall hollow pipe, can be further used for manufacturing an annular tool and die cutter, can save the process and materials for hollowing out solid materials compared with the prior art, can improve the production efficiency, and has good practicability.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (8)

1. A preparation method of a high-alloy tool and die steel hollow pipe blank is characterized by comprising the following steps: the method comprises the following steps:
a. the refined high alloy tool and die steel molten steel is made into a hollow steel ingot with one closed end by injection molding;
b. filling a rheological material meeting the hot forging deformation requirement in the hollow steel ingot, tamping the rheological material, and then closing one end of an opening of the hollow steel ingot, wherein the rheological material is aluminum oxide powder, and the granularity of the aluminum oxide powder is 60-120 mm;
c. putting the hollow steel ingot filled with the rheological material into a furnace for heating;
d. discharging the heated hollow steel ingot out of the furnace, performing radial forging on the hollow steel ingot on a finish forging machine to obtain a high alloy tool and die steel billet with the diameter meeting the requirement, putting the high alloy tool and die steel billet into the furnace for annealing, and cooling and straightening the annealed high alloy tool and die steel billet;
e. and determining the positions of inner holes at two ends of the high-alloy tool and die steel billet, cutting off the end part of the steel billet at the positions, and removing the filled rheological material to obtain the high-alloy tool and die steel hollow pipe blank.
2. The method for preparing the high alloy tool and die steel hollow shell according to claim 1, characterized in that: and c, heating according to the cogging heating specification of the corresponding steel grade of the high alloy tool and die steel.
3. The method for preparing the high alloy tool and die steel hollow shell according to claim 1, characterized in that: and d, performing radial forging on the finish forging machine in the step d, wherein the deformation ratio of the hollow steel ingot is not less than 3.
4. The method for preparing the high alloy tool and die steel hollow shell according to claim 1, characterized in that: and e, determining the positions of inner holes at two ends through ultrasonic flaw detection, and removing two end parts of the steel billet through a band saw.
5. A high alloy tool and die steel hollow shell produced by the method of producing a high alloy tool and die steel hollow shell according to any one of claims 1 to 4.
6. A high alloy tool and die steel pipe is characterized in that: the high alloy tool and die steel pipe is obtained by sizing, peeling and flaw detection finishing of the high alloy tool and die steel hollow pipe blank of claim 5.
7. An annular cutter which is characterized in that: the annular cutter is obtained by blanking the high alloy tool and die steel hollow pipe blank of claim 5 and then machining or rolling and die forging the blank.
8. The annular cutter of claim 7, wherein: the annular cutter is a disc shear blade obtained through machining, or the annular cutter is a shield hobbing cutter ring obtained through rolling and die forging.
CN201910379194.3A 2019-05-08 2019-05-08 Method for preparing high alloy tool and die steel hollow pipe blank, hollow pipe blank and annular cutter Active CN110153186B (en)

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CN112705656A (en) * 2020-11-12 2021-04-27 贵阳安大宇航材料工程有限公司 H13E shield hob ring forming process

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