CN115415505A - 一种铸铁冷却底板的铸造工艺 - Google Patents
一种铸铁冷却底板的铸造工艺 Download PDFInfo
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- 229910001018 Cast iron Inorganic materials 0.000 title claims abstract description 37
- 238000001816 cooling Methods 0.000 title claims abstract description 35
- 238000005266 casting Methods 0.000 title claims abstract description 28
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims abstract description 14
- 229910001060 Gray iron Inorganic materials 0.000 claims abstract description 12
- 238000004321 preservation Methods 0.000 claims abstract description 10
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 10
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 7
- 238000007711 solidification Methods 0.000 claims abstract description 7
- 230000008023 solidification Effects 0.000 claims abstract description 7
- 239000010959 steel Substances 0.000 claims abstract description 7
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 6
- 239000000126 substance Substances 0.000 claims abstract description 6
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 6
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 5
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims abstract description 4
- 238000004519 manufacturing process Methods 0.000 claims abstract description 4
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 3
- 238000005336 cracking Methods 0.000 abstract description 6
- 239000011651 chromium Substances 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 4
- 230000002035 prolonged effect Effects 0.000 abstract description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 abstract description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 3
- 239000010703 silicon Substances 0.000 abstract description 3
- 239000003607 modifier Substances 0.000 abstract description 2
- 238000010583 slow cooling Methods 0.000 abstract 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910002804 graphite Inorganic materials 0.000 description 4
- 239000010439 graphite Substances 0.000 description 4
- 230000035882 stress Effects 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004512 die casting Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910001567 cementite Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 238000011081 inoculation Methods 0.000 description 1
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/02—Casting in, on, or around objects which form part of the product for making reinforced articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/16—Casting in, on, or around objects which form part of the product for making compound objects cast of two or more different metals, e.g. for making rolls for rolling mills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/20—Measures not previously mentioned for influencing the grain structure or texture; Selection of compositions therefor
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D3/00—Diffusion processes for extraction of non-metals; Furnaces therefor
- C21D3/02—Extraction of non-metals
- C21D3/06—Extraction of hydrogen
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D5/00—Heat treatments of cast-iron
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/06—Cast-iron alloys containing chromium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
本发明公开了一种铸铁冷却底板的铸造工艺,包括以下步骤:制作框形模具;设置加强筋;浇铸,优选地,灰铸铁化学成分及质量百分比如下:C:3.5%,Si:0.85%,Mn:0.55%,P:0.01%,S:0.09%,Cr:0.5%,其余为Fe;浇铸过程中加入0.15‑0.2%变质剂硅铁;凝固后,保温缓冷;脱模精整;热处理。本发明通过模具内预埋双层圆钢加强筋、减低灰铸铁中的硅含量并添加铬和脱模精整后热处理,减少了由于急冷急热形成内应力导致的底板开裂,提高了使用寿命,降低了成本,减少在使用过程中底板开裂导致的安全事故。
Description
技术领域
本发明涉及铸造工艺,尤其涉及一种铸铁冷却底板的铸造工艺。
背景技术
传统的模铸过程使用的铸铁底板吸收过热钢水的热量、铸锭热量、铸锭凝固时放出的结晶潜热。铸铁底板在长期反复的急冷急热的影响下极易产生内应力导致底板开裂,从而影响底板使用寿命,甚至产生安全事故。因此,提高铸铁底板的使用寿命成为模铸技术急需解决的问题。
发明内容
发明目的:本发明旨在提供一种提高使用寿命的铸铁冷却底板的铸造工艺。
技术方案:本发明所述的铸铁冷却底板的铸造工艺,包括以下步骤:
(1)制作框形模具;
(2)设置加强筋:在模具内设置圆钢组成的加强筋结构;
(3)浇铸:将灰铸铁高温熔化后得到的液态铁水浇入模具中,浇铸后圆钢表面熔化与铁水融为一体,可以提高铸铁冷却底板的强度;浇铸过程中加入0.15-0.2%变质剂硅铁进行孕育,增加非自发晶核使石墨细化;
(4)凝固后保温缓冷,保温温度600-700℃,保温时间4-5天,表面温度降至100℃以下;
(5)脱模精整;
(6)热处理:将铸件升温到600-650℃,升温速率小于100℃/min,保温时间H为:
其中,D表示铸铁冷却底板的厚度,单位为米,H的单位为小时;热处理有利于扩氢,同时消除热应力;
(7)得到铸铁冷却底板。
进一步地,步骤(3)中灰铸铁化学成分及质量百分比如下:C:3.4-3.6%,Si:0.7-0.9%,Mn:0.6-0.8%,P<0.04%,S<0.10%,Cr:0.4-0.6%,其余为Fe。灰铸铁在使用过程中反复加热到900℃以上,铸铁的体积将逐渐增大产生裂纹,导致断裂;高温时,铸铁中渗碳体通过分解转变石墨,氧沿石墨片渗入使铁氧化形成疏松的氧化产物氧化铁也会导致开裂;适当减低硅含量,减少片状石墨,同时向铸铁中添加少量铬能有效地减轻和防止铸铁长大开裂。
优选地,步骤(3)中灰铸铁化学成分及质量百分比如下:C:3.5%,Si:0.85%,Mn:0.55%,P:0.01%,S:0.09%,Cr:0.5%,其余为Fe。
进一步地,步骤(2)中加强筋是排列间距1-1.5m的双层结构,提高了过冷度,加快形核速度增强凝固组织强度。
进一步地,所述铸铁冷却底板下表面为田字形。
进一步地,所述铸铁冷却底板的支腿结构采用田字形,防止应力集中导致的底板变形。
有益效果:本发明与现有技术相比,其显著优点是:本发明通过模具内预埋双层圆钢加强筋、减低灰铸铁中的硅含量并添加铬和脱模精整后热处理,减少了由于急冷急热形成内应力导致的底板开裂,提高了使用寿命,降低了成本,减少在使用过程中底板开裂导致的安全事故。
附图说明
图1为本发明的流程图;
图2为浇铸前铸铁冷却底板内部结构示意图;
图3为浇铸后铸铁冷却底板俯视图;
图4为浇铸后铸铁冷却底板仰视图。
具体实施方式
下面结合附图对本发明作进一步说明。
本发明所述铸铁冷却底板的铸造工艺,包括以下步骤:
(1)制作框形模具;
(2)设置加强筋:在模具内设置直径50mm的圆钢作为加强筋,排列间距1.2m,双层结构,如图2所示;
(3)浇铸:将灰铸铁高温熔化后得到的液态铁水浇入模具中,灰铸铁化学成分及质量百分比如下:C:3.5%,Si:0.85%,Mn:0.55%,P:0.01%,S:0.09%,Cr:0.5%,其余为Fe;浇铸过程中加入0.15-0.2%变质剂硅铁;
(4)凝固后保温缓冷,保温温度700℃,保温时间5天,表面温度降至80℃;
(5)脱模精整;
(6)热处理:铸铁冷却底板的厚度为1m,将铸件升温到600℃,升温速率90℃/min,保温时间42h;
(7)得到铸铁冷却底板,铸铁冷却底板的底板下表面为田字形,支腿结构采用田字形。
本发明底板与铸锭重量比1.5时,凝固时间减少较为显著,40t铸锭完全凝固时间是8h;铸铁冷却底板使用寿命提高了50%以上。
Claims (6)
2.根据权利要求1所述铸铁冷却底板的铸造工艺,其特征在于,步骤(3)中灰铸铁化学成分及质量百分比如下:C:3.4-3.6%,Si:0.7-0.9%,Mn:0.6-0.8%,P<0.04%,S<0.10%,Cr:0.4-0.6%,其余为Fe。
3.根据权利要求1所述铸铁冷却底板的铸造工艺,其特征在于,步骤(3)中灰铸铁化学成分及质量百分比如下:C:3.5%,Si:0.85%,Mn:0.55%,P:0.01%,S:0.09%,Cr:0.5%,其余为Fe。
4.根据权利要求2所述铸铁冷却底板的铸造工艺,其特征在于,步骤(2)中加强筋是排列间距1-1.5m的双层结构。
5.根据权利要求4所述铸铁冷却底板的铸造工艺,其特征在于,所述铸铁冷却底板下表面为田字形。
6.根据权利要求5所述铸铁冷却底板的铸造工艺,其特征在于,所述铸铁冷却底板的支腿结构采用田字形。
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GB1315543A (en) * | 1970-05-11 | 1973-05-02 | Foseco Int | Casting of metal ingots |
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GB1315543A (en) * | 1970-05-11 | 1973-05-02 | Foseco Int | Casting of metal ingots |
CN105525190A (zh) * | 2014-09-28 | 2016-04-27 | 天津众达精密机械有限公司 | 一种灰铸铁及其制造方法 |
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