CN100349691C - Manufacture for casting low-alloy cold-working die steel and die steel thereby - Google Patents

Manufacture for casting low-alloy cold-working die steel and die steel thereby Download PDF

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Publication number
CN100349691C
CN100349691C CNB2004100985762A CN200410098576A CN100349691C CN 100349691 C CN100349691 C CN 100349691C CN B2004100985762 A CNB2004100985762 A CN B2004100985762A CN 200410098576 A CN200410098576 A CN 200410098576A CN 100349691 C CN100349691 C CN 100349691C
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China
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casting
steel
temperature
heat treatment
low
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CN1613598A (en
Inventor
刘金海
刘根生
郝晓燕
李国禄
张宏标
李海鹏
梁春永
陈学广
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Hebei University of Technology
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Hebei University of Technology
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/20Recycling

Abstract

The present invention discloses a fabrication technology for casting low alloy die steel, which is characterized in that the fabrication technology process is material preparation, intermediate-frequency electric furnace smelting, stokehole modification, model casting, peeling, annealing heat treatment, numerically controlled machining and shorterizing. The main alloy element is Si, Mn, Cr, Mo, V and the microelement modification is carried out on Si, Mn, Cr, Mo, V; the rest is Fe, and the annealing heat treatment and shorterizing are carried out on Fe. The casting low alloy die steel of the present invention is mainly used for making a die edge of an automobile cover.

Description

A kind of casting low-alloy cold-working mould steel
Technical field
The present invention relates to be used to make a kind of casting low-alloy cold-working mould steel of automobile panel; Disclosing a kind of mould steel chemical composition of utilizing cast moulding method directly to produce the automobile panel cold-punching mold to use, casting technique, surface heat especially handles.
Background technology
Mold materials and blank forming technology are the key factors that influences automobile die quality, cost and manufacturing cycle, and the forming technology of the mold materials and the blank of inserting thereof affects the processing technology of mould.At present, the tradition that is widely used in making the automobile panel blanking die is forged Cr12MoV mould steel, T10 and is forged the air cooling steel and insert and exist many problems: the forging mold complex procedures of inserting, the shape drop is little, allowance is big, machining period is long, stock utilization low (30-50%), extremely incompatible modern shaping numerical control machining center fast is to the requirement of mold materials; Forge Cr12MoV and T10 die insert and must adopt integral quenching, be easy to generate distortion, increased Mould Machining and grinding step, prolong die manufacturing cycle; In addition, the integral quenching forging mold is inserted and is easy to generate crackle, and its repairing performance is relatively poor, causes mould to produce waste product.
In addition, in recent years, the cast iron cutting edge technique for overlaying of inserting is adopted in research both at home and abroad, and the car cladding member mold that steams next life is inserted, but built-up welding cutting edge hardness height, processing difficulties.
Fast development along with Domestic Automotive Industry, various processing equipments are all developing to high performance and automation direction, requirement to aspects such as Mould Machining precision, mechanical performance and low costs is more and more higher, traditional mold materials, moulding process and heat treatment method all the more are difficult to adapt to the production pattern that present automobile making is tending towards many kinds, small lot, and this has seriously hindered the remodeling replacement speed of China's automobile.
Summary of the invention
The present invention is directed to the technical problem that above-mentioned forging mold steel is inserted and existed, by optimizing chemical composition design, the reasonably rotten processing of melting and stokehold, annealing heat treatment and shorterizing heat treatment etc., invent a kind of casting low-alloy mould steel that is applicable to car panel die, realized casting and forging.
The technical solution used in the present invention is: a kind of casting low-alloy cold-working mould steel, it adopts following processing step manufacturing: get the raw materials ready → the rotten processing → moulding casting → peeling in electrosmelting of intermediate frequency → stokehold → annealing heat treatment → digital control processing → shorterizing.Casting cold work die steel of the present invention adopts the medium-frequency induction furnace melting, and raw material are the pig iron, steel scrap, ferrosilicon, ferromanganese, ferrochrome, molybdenum-iron, vanadium iron etc., and tapping temperature is 1580-1650 ℃, and cast temperature 1460-1480 ℃, the water-glass sand cavityless casting.
Composite modifier is adopted in the processing of going bad before casting of steel alloy liquid, and the alterant composition is: rare earth, titanium, boron, silicon, iron, its addition are 0.1-0.6%.
The mould steel spray is carried out spheroidizing heat treatment, and the annealing process parameter is: the soak temperature is 800-860 ℃, temperature retention time 2-6 hour; 650-740 ℃ of low temperature holding temperature, temperature retention time 4-8 hour.
After the annealed heat treatment of cast blank spare, carry out the cnc profiling machined, then, utilize acetylene-oxygen, the cutting edge of die insert is carried out shorterizing.The heating-up temperature of control sample cutting edge is 850 ℃~960 ℃, and about flame gun test coupon 2~5mm, the average translational speed of flame gun is 2-3mm/s, and the angle between flame and sample is about 65-75 °.
Casting cold work die steel of the present invention contains following alloying component: 0.55-0.85%C, 0.60-1.40%Si, 0.70-1.30%Mn, 0.60-1.8%Cr, Mo<0.8%, V<0.6%, P<0.04%, S<0.04%, and all the other are Fe.
This casting low-alloy mould steel is mainly used in makes inserting of automobile panel cold-punching mold.
Advantage that the present invention has and effect:
Utilize the die insert mechanical property of casting low-alloy mould steel of the present invention manufacturing to reach the performance that forging mold is inserted, realized casting and forging, satisfy the requirement of car panel die, can reach more than 300,000 times service life.
The specific embodiment
A kind of casting low-alloy cold-working mould steel, its manufacturing technology steps is: get the raw materials ready → the rotten processing → moulding casting → peeling in electrosmelting of intermediate frequency → stokehold → annealing heat treatment → digital control processing → shorterizing, casting cold work die steel of the present invention adopts the medium-frequency induction furnace melting, raw material are the pig iron, steel scrap, ferrosilicon, ferromanganese, ferrochrome, molybdenum-iron, vanadium iron etc., tapping temperature is 1580-1650 ℃, cast temperature 1460-1480 ℃, the water-glass sand cavityless casting.
Casting cold work die steel of the present invention contains following alloying component: 0.55-0.85%C, 0.60-1.40%Si, 0.70-1.30%Mn, 0.60-1.8%Cr, Mo<0.8%, V<0.6%, P<0.04%, S<0.04%, and all the other are Fe.
Composite modifier is adopted in the processing of going bad before casting of steel alloy liquid, and the alterant composition is: rare earth, titanium, boron, silicon, iron, its addition are 0.1-0.6%.
The mould steel spray is carried out spheroidizing heat treatment, and the annealing process parameter is: the soak temperature is 800-860 ℃, temperature retention time 2-6 hour; 650-740 ℃ of low temperature holding temperature, temperature retention time 4-8 hour.
After the annealed heat treatment of cast blank spare, carry out the cnc profiling machined, then, utilize acetylene-oxygen, the cutting edge of die insert is carried out shorterizing.The heating-up temperature of control sample cutting edge is 850 ℃~960 ℃, and about flame gun test coupon 2~5mm, the average translational speed of flame gun is 2-3mm/s, and the angle between flame and sample is about 65-75 °.
Utilize the die insert mechanical property of casting low-alloy mould steel of the present invention manufacturing to reach the performance that forging mold is inserted, as shown in table 1, satisfy the requirement of car panel die, can reach more than 300,000 times service life.
Table 1 casting die steel of the present invention and the contrast of forging air cooling mould steel mechanical property
The material kind Tensile strength Percentage elongation % Impact flexibility J/cm 2 Hardness HRC
??A KU2 ??A K
Tradition is forged the air cooling steel ??870 ??12.8 ??29.3 ??162.1 ??20.3
Casting die steel of the present invention ??863 ??16.1 ??37.5 ??177.3 ??19.4
The austenitizing temperature of casting cold work die steel of the present invention and phase critical point, as shown in table 2.
Table 2 casting die steel phase critical point (℃)
Transformation temperature ??Ac 1 ??Ac 3 ??Ar 1 ??Ms
Temperature ??759 ??815 ??646 ??191
Casting is inserted can the conformal manufacturing, approaches clean shaping, and allowance is obviously less, and forging inserts saves machining period more than 50% than adopting, and saves die steel material, remarkable in economical benefits.
It is low and even to cast the annealed state hardness of inserting, and adapts to the condition of work at modern numerical control rapid processing center especially, for realizing that shortening die manufacturing cycle provides necessary mold materials basis with the raising mould and die accuracy.
This casting insert material selection of chemical composition science, behind shorterizing, hardness is HRC55-60, be evenly distributed, and punch die cutting edge reparation property is good, is the ideal material of deburring, punch die cutting edge.
This is inserted and has changed former stamping die integral quenching technology, adopts flame surface quenching, has saved the heat treatment expense, easy and simple to handle, deflection is little, has saved loaded down with trivial details operations such as a large amount of repeated dismounting of mould assembly and adjustment process, grinding, shortens the manufacturing cycle of mould greatly.

Claims (5)

1, a kind of casting low-alloy cold-working mould steel, it is characterized in that adopting following processing step manufacturing: get the raw materials ready → the rotten processing → moulding casting → peeling in electrosmelting of intermediate frequency → stokehold → annealing heat treatment → digital control processing → shorterizing, wherein get the raw materials ready and the electrosmelting of intermediate frequency process is: the casting cold work die steel adopts the medium-frequency induction furnace melting, raw material are the pig iron, steel scrap, ferrosilicon, ferromanganese, ferrochrome, molybdenum-iron and vanadium iron, tapping temperature is 1580-1650 ℃, cast temperature 1460-1480 ℃, the water-glass sand cavityless casting.
2, casting low-alloy cold-working mould steel as claimed in claim 1, it is characterized in that: the casting cold work die steel contains following alloying component: 0.55-0.85%C, 0.60-1.40%Si, 0.70-1.30%Mn, 0.60-1.8%Cr, Mo<0.8%, V<0.6%, P<0.04%, S<0.04%, and all the other are Fe.
3, casting low-alloy cold-working mould steel as claimed in claim 1, it is characterized in that: the annealing heat treatment process is: the mould steel spray is carried out spheroidizing heat treatment, the annealing process parameter is: the soak temperature is 800-860 ℃, temperature retention time 2-6 hour; 650-740 ℃ of low temperature holding temperature, temperature retention time 4-8 hour.
4, casting low-alloy cold-working mould steel as claimed in claim 1, it is characterized in that: after the annealed heat treatment of cast blank spare, carry out the cnc profiling machined, then, utilize acetylene-oxygen, the cutting edge of die insert is carried out shorterizing, the heating-up temperature of control sample cutting edge is 850 ℃~960 ℃, about flame gun test coupon 2~5mm, the average translational speed of flame gun is 2-3mm/s, and the angle between flame and sample is about 65-75 °.
5, casting low-alloy cold-working mould steel as claimed in claim 1 is characterized in that: the processing of before casting, going bad of steel alloy liquid, adopt composite modifier, and the alterant composition is: rare earth, titanium, boron, silicon, iron, its addition are 0.1-0.6%.
CNB2004100985762A 2004-12-14 2004-12-14 Manufacture for casting low-alloy cold-working die steel and die steel thereby Expired - Fee Related CN100349691C (en)

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Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101972925B (en) * 2010-10-21 2013-02-13 浙江东钨实业有限公司 Method for processing molding die used in hard alloy production
CN102477516A (en) * 2010-11-26 2012-05-30 浙江黄岩冲模厂 Novel cast die steel and manufacture method thereof
CN102031341A (en) * 2010-12-11 2011-04-27 中国第一汽车集团公司 Acetylene flame surface quenching method for frame structure cast iron pressing mold
CN103056339A (en) * 2012-12-25 2013-04-24 江苏联兴成套设备制造有限公司 Casting technique of cross-beam temperature measuring device of blast furnace
CN103147019A (en) * 2013-03-13 2013-06-12 武汉理工大学 Casting method of cold working die module
CN106868411A (en) * 2016-12-27 2017-06-20 芜湖倍思科创园有限公司 A kind of low chromium abrasion-proof steel ball of high rigidity high impact toughness and preparation method thereof
CN107363488A (en) * 2017-07-20 2017-11-21 苏州市天星山精密模具有限公司 A kind of processing technology of high abrasion mould
JP2019089094A (en) * 2017-11-14 2019-06-13 大同特殊鋼株式会社 Die repair weld material
CN107983935A (en) * 2017-11-18 2018-05-04 蚌埠市嘉实机电设备制造有限公司 A kind of method of steel die forging processing
CN109590438A (en) * 2018-12-24 2019-04-09 重庆红方机电有限公司 A kind of manufacturing method of new electronic control cabinet
CN109616932A (en) * 2018-12-24 2019-04-12 重庆红方机电有限公司 A kind of manufacturing method of power control cabinet
CN111575595A (en) * 2020-07-06 2020-08-25 朱文清 Economical hot-press casting die steel and preparation method thereof

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