CN1265913C - Retaining ring steel hot forging technology for generator - Google Patents
Retaining ring steel hot forging technology for generator Download PDFInfo
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- CN1265913C CN1265913C CN 200410040478 CN200410040478A CN1265913C CN 1265913 C CN1265913 C CN 1265913C CN 200410040478 CN200410040478 CN 200410040478 CN 200410040478 A CN200410040478 A CN 200410040478A CN 1265913 C CN1265913 C CN 1265913C
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- steel
- steel ingot
- hot forging
- guard ring
- blank
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Abstract
The present invention discloses a hot forging technology of guard ring steel of a generator, which aims at solving the problem of ingot cracking in the prior art. A method adopted in the present invention comprises that before steel ingot hot forging, a coating layer of carbon steel of high plasticity is poured on the surface of a steel ingot; after a heating, a drawing out and an upsetting hot forging working procedures, the coating material on the steel ingot is removed so as to obtain a needed guard ring hot forging blank. With the adoption of the present invention, a steel ingot of low plasticity is coated in a layer of common carbon steel of high plasticity, so that a forging blank deforms under the state of three-way compressive stress. Consequently, the plasticity of a forging blank is improved and cracking is prevented. Because the plasticity is enhanced in the process of hot forging and cracking is prevented, blank volume reduction is avoided because of repeated cracking elimination, which saves material, reduces production cost, increases the rate of finished products and pushes the development of the technology in which 1Mn18Cr18N is used as the material of a guard ring of a generator.
Description
Technical field
The invention belongs to the forging field, it is a kind of FMT of the alloy steel material at the thermoplasticity difference, these materials comprise 1Mn18Cr18N, Cr12, high-carbon high-alloy steel etc., further are to the alloy material as generator guard ring---the heat forging technology of 1Mn18Cr18N steel.
Background technology
The 1Mn18Cr18N generator guard ring is carried out the JB/T7030-2002 standard in process of production.1Mn18Cr18N claims two 18 steel, retaining ring steel again, because of this material has very high anti-stress corrosion performance, is used to the making of generator guard ring gradually.
At present, the manufacturing of this retaining ring is to adopt electric slag refusion ingot.At first, the steel ingot blank must pass through forge hot, and this operation is to finish on hydraulic press.Adopt conventional forging method to be: blanking-jumping-up-punching-pre-reaming-saddle pulling-Lve reaming-smooth.Yet this technology is difficult to reach predetermined purpose, and main difficult point is that this material thermoplasticity is poor especially, begins to occur crackle through hydraulic press once pressing, along with further distortion, crackle develops rapidly, so just must cool down to carry out air-arc cutting, repeatedly for several times, crackle is removed in peeling layer by layer.Stock volume has been reduced, can only make the retaining ring of setting progression less than original, wasted a large amount of manpower and materials, and yield rate is extremely low, the product cost height has seriously hindered 1Mn18Cr18N applying as generator guard ring.
Summary of the invention
The forging method that the present invention is directed to the material of thermoplasticity poor especially (being that malleability is poor) and propose is as the forge hot of 1Mn18Cr18N, Cr12, high-carbon high-alloy steel etc.The present invention mainly solves these materials and crackle occurs in hot forging process, thereby causes problems such as blank loss, yield rate are low, product cost height.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is as follows:
A kind of generator guard ring steel hot forging method, it is characterized in that: before inductile steel ingot forge hot, at its surface casting one deck high-ductility carbon steel integument, blank is out of shape under the three-dimensional compressive stress state, after the described blank heating integument is cooled off rapidly, forge hot is again removed the wrapper on the steel ingot after the forge hot again.
Steel ingot behind the parcel is heated to 1200 ℃ ± 10 ℃ insulations and comes out of the stove, and forges on hydraulic press.
Before forging, described steel ingot heating back rapidly described integument is water-cooled to 900～1000 ℃.
Described steel ingot is a hollow steel ingot, and wrapper is cast in the outer surface and the endoporus of hollow steel ingot, misses the wrapper in the endoporus behind the hot-forging forming on drain cap, and outer wrapper is removed in cooling more then, obtains required retaining ring forge hot blank.
Described steel ingot is solid steel ingot, and wrapper is cast in the outer surface of solid steel ingot, carries out forge hot after heating is come out of the stove, and removes outer wrapper after the cooling again, obtains required retaining ring forge hot blank.
Described integument high-ductility carbon steel is selected common 45 steel for use.
Described integument thickness is 60mm.
The invention has the advantages that:
The present invention adopts before the forge hot method of parcel high-ductility carbon steel on steel ingot, has solved the direct compressed steel ingot of hydraulic press in the existing 1Mn18Cr18N retaining ring steel thermal forging technology and the problem of crackle occurs.Inductile steel ingot is wrapped in the common straightcarbon steel of one deck high-ductility, and forging stock is out of shape under the three-dimensional compressive stress state, thereby has improved the plasticity of forging stock; This material narrow forging temperature of 1Mn18Cr18N (1200 ℃～900 ℃) in addition, because the outer wrapping layer has been arranged, forging stock cooling velocity slow (particularly edges and corners) has so also improved plasticity, prevents that crackle from producing.Owing in hot forging process, strengthened plasticity, prevented the crackle generation, and then avoided reducing stock volume because of removing crackle repeatedly, saved material, reduced production cost, improved yield rate, promoted the development of 1Mn18Cr18N as this technology of generator guard ring.
Description of drawings
Fig. 1 is the retaining ring forging drawing
Fig. 2 is cast integument schematic diagram
The outer garden (pulling) of Fig. 3 hydraulic press roll forging steel ingot schematic diagram
Fig. 4 is a schematic diagram of missing hollow steel ingot endoporus wrapper
The specific embodiment
Innovative point of the present invention is the common straightcarbon steel of inductile material outer wrapping one deck high-ductility is carried out forge hot, has improved the plasticity of 1Mn18Cr18N retaining ring thus, prevents that crackle from producing.Because this FMT relates to the steel-smelting technology problem of electroslag remelting, so two kinds of schemes of following branch come selectivity to implement.Be that feed is hollow steel ingot and solid steel ingot.Its technology is distinguished to some extent, provides following two embodiment at above-mentioned two kinds of schemes:
Embodiment 1
Make the hollow steel ingot 1 bigger once, steel ingot during at electroslag remelting, as shown in Figure 1 with forge hot blank dimension.After vertical lathe peeling processing just in time is forge hot blank dimension.Peeling processing main purpose is to remove defectives such as the crackle of surface of steel ingot and endoporus, pipe.If the hollow steel ingot surface quality meets the requirements, can save this step, also available emery wheel is removed blemish.
Two, at the integument 2 of hollow steel ingot 1 surface and endoporus cast one deck high-ductility common straightcarbon steel (45 steel, or similar other carbon steel), as shown in Figure 2.Thickness can adopt about 60mm (can according to grasping flexibly in the production process) each limit even, and measures external diameter Φ 3 and height H 2.
Three, will wrap up good steel ingot and be heated to 1200 ℃, come out of the stove through insulation, blank 3 is placed on the hydraulic press, (its purpose is to improve the resistance of deformation of appearance integument with two sparge pipes the external diameter integument to be cooled to 900～1000 ℃ immediately, make it be slightly larger than the resistance of deformation of inner blank, whole forging process integument is all tightly bound round on steel ingot, play the purpose that improves plasticity) begin to forge, on hydraulic press, spur and walk on stage, ratio of height to diameter is controlled about 2.5 as shown in Figure 3 in the outer garden of roll forging (i.e. pulling); Jumping-up, highly=external diameter.Pulling jumping-up 2～3 times repeatedly (number of occurrence is as the criterion to reach forging ratio) makes forging appearance and size reach for the last time and forges preceding parcel steel ingot appearance and size, i.e. Φ 3 and H2 like this.
Four, miss endoporus wrapper (as shown in Figure 4) on drain cap 4, forging finishes.Forging air cooling or water-cooled.When roughing, go (or with gas cutting, air-arc cutting) to obtain needed retaining ring forge hot blank at last with the vertical lathe car in the outer wrapping material.
Embodiment 2
If electroslag remelting makes hollow steel ingot and has any problem, can adopt following scheme;
One, solid steel ingot is carried out surface treatment---peeling, remove defective, remove steel ingot upper and lower end parts (blanking) simultaneously.
Two, will under material blank is wrapped in the high-ductility common straightcarbon steel (45 steel, or similar other carbon steel) of one deck equal thickness thickness S ≈ 60mm, the same hollow ingot of method with casting.
Three, with the blank heating of parcel to 1200 ℃ of forging temperatures, come out of the stove, hang on hydraulic press with two sparge pipes and cool off both ends of the surface integument to 900～1000 ℃ respectively.---------saddle is worked as the plug pulling---slightly saddle is extracted in reaming out---, and smooth end goes out finished product (these smithing technological parameters are identical with conventional forging) in pre-reaming in punching to carry out jumping-up then.Size Control: endoporus does not have wrapper, directly measures to reach hole dimension in the forging; Highly: the forging height adds twice parcel thickness (upper and lower end face), and unnecessary material is stayed external diameter (need not control), finished product air cooling or water-cooled, and on vertical lathe outer wrapping is pruned (or with gas cutting, air-arc cutting) obtains needed retaining ring forge hot blank.
The technical standard of the alleged 1Mn18Cr18N steel of the present invention is seen the JB/T7030-2002 standard.
The aim of the parcel forging method that the present invention adopts is that inductile steel ingot is wrapped in the common straightcarbon steel of one deck high-ductility, forging stock is out of shape under the three-dimensional compressive stress state, thereby has improved the plasticity of forging stock; This material narrow forging temperature of 1Mn18Cr18N (1200 ℃～900 ℃) in addition, because the outer wrapping layer has been arranged, blank cooling velocity slow (particularly edges and corners) has so also improved plasticity, prevents that crackle from producing.
The present invention is not only applicable to the forge hot as the 1Mn18Cr18N steel of generator guard ring, is applicable to that other thermoplasticity are poor yet, and the forge hot of more valuable alloy material, as Cr12, high-carbon high-alloy steel etc.
Claims (7)
1, generator guard ring steel hot forging method, it is characterized in that: before inductile steel ingot forge hot, at its surface casting one deck high-ductility carbon steel integument, blank is out of shape under the three-dimensional compressive stress state, after the described blank heating integument is cooled off rapidly, forge hot is again removed the wrapper on the steel ingot after the forge hot again.
2, generator guard ring steel hot forging method according to claim 1 is characterized in that: the steel ingot behind the parcel is heated to 1200 ℃ ± 10 ℃ insulations and comes out of the stove, and forges on hydraulic press.
3, generator guard ring steel hot forging method according to claim 1 and 2, it is characterized in that: described integument is water-cooled to 900～1000 ℃.
4, generator guard ring steel hot forging method according to claim 1 and 2, it is characterized in that: described steel ingot is a hollow steel ingot, wrapper is cast in the outer surface and the endoporus of hollow steel ingot, on drain cap, miss the wrapper in the endoporus after the forge hot, outer wrapper is removed in cooling more then, obtains required retaining ring forge hot blank.
5, generator guard ring steel hot forging method according to claim 1 and 2, it is characterized in that: described steel ingot is solid steel ingot, and wrapper is cast in the outer surface of solid steel ingot, carries out forge hot after heating is come out of the stove, remove outer wrapper after the cooling again, obtain required retaining ring forge hot blank.
6, generator guard ring steel hot forging method according to claim 1 and 2 is characterized in that: described integument high-ductility carbon steel is selected 45 steel for use.
7, generator guard ring steel hot forging method according to claim 1 and 2, it is characterized in that: integument thickness is 60mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410040478 CN1265913C (en) | 2004-08-18 | 2004-08-18 | Retaining ring steel hot forging technology for generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410040478 CN1265913C (en) | 2004-08-18 | 2004-08-18 | Retaining ring steel hot forging technology for generator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1613570A CN1613570A (en) | 2005-05-11 |
| CN1265913C true CN1265913C (en) | 2006-07-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410040478 Expired - Fee Related CN1265913C (en) | 2004-08-18 | 2004-08-18 | Retaining ring steel hot forging technology for generator |
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| CN (1) | CN1265913C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100342993C (en) * | 2005-05-31 | 2007-10-17 | 太原科技大学 | Method for producing circular cog hot forged from generator protective ring and mould |
| CN101515743B (en) * | 2008-02-18 | 2011-02-16 | 上海电气集团上海电机厂有限公司 | Method for manufacturing thin-wall guard rings for large-sized high-speed motors |
| CN102581189B (en) * | 2012-01-12 | 2014-04-02 | 太原科技大学 | Method for forging annular cylinder by aid of electroslag remelted hollow blank |
| CN106563751B (en) * | 2016-10-13 | 2019-01-18 | 四川远方高新装备零部件股份有限公司 | Nonmagnetic high Mn austenite stainless steel forging technology |
| CN113798420A (en) * | 2021-09-17 | 2021-12-17 | 四川丰元机械制造有限公司 | Forging method of non-magnetic retaining ring of turbo-generator 1Mn18Cr18N |
| CN114247839B (en) * | 2021-12-21 | 2022-11-11 | 烟台万隆真空冶金股份有限公司 | Composite production method of large-sized cylinder |
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- 2004-08-18 CN CN 200410040478 patent/CN1265913C/en not_active Expired - Fee Related
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| CN1613570A (en) | 2005-05-11 |
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