CN103831587B - 一种电镦式钢拉杆端头锻造工艺 - Google Patents

一种电镦式钢拉杆端头锻造工艺 Download PDF

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CN103831587B
CN103831587B CN201410047422.4A CN201410047422A CN103831587B CN 103831587 B CN103831587 B CN 103831587B CN 201410047422 A CN201410047422 A CN 201410047422A CN 103831587 B CN103831587 B CN 103831587B
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forging
incubated
cooled
technique
heated
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CN103831587A (zh
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章功国
王泾文
段宗银
李纯金
陈超
王淑妍
张少伍
王晓芬
谢勇
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Hubei province Han Precision Forging Co., Ltd.
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Anhui Jisite Intelligent Equipment Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23PMETAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00Other engines
    • F02B75/32Engines characterised by connections between pistons and main shafts and not specific to preceding main groups

Abstract

本发明公开了一种电镦式钢拉杆端头锻造工艺,包括以下步骤:锭中化学成分重量百分比为:0.28%≤C≤0.35%,0.40≤Si≤1.40%,0.40%≤Mn≤1.40%,0.015%≤P≤0.125%,0.006≤S≤0.026%,0.10≤Ti≤0.25%,2.50%≤Cr≤3.50%,痕量≤B≤0.0018%,0.08%≤Cu≤0.15%,余量为铁及不可避免的杂质;浇注成型的钢锭温度降至350℃,再加热至600‑700℃,保温3‑5小时,炉冷至350℃,保温3小时,再加热至500‑580℃,保温5‑7小时,以20℃/小时冷却至300℃,再以20℃/小时,冷却至常温;本发明使其利于大批量的工业化的生产,并减少了锻造过程中出现夹污、充不满的现象,产品的力学性能进一步改善,节约了产品用料,提高了产品的模具寿命。

Description

一种电镦式钢拉杆端头锻造工艺
技术领域
[0001 ]本发明涉及一种电镦式钢拉杆端头锻造工艺。
背景技术
[0002]钢拉杆是发动机上的一个重要机件,其材料是由碳素结构钢或球墨铸铁制成的,有两个重要部位:主轴颈和连杆颈。主轴颈被安装在缺体上,连杆颈与连杆大头孔连接,连杆小头孔与汽缸活塞连接,是一个典型的曲柄滑块机构。
[0003]发动机钢拉杆作为重要运动部件,设计要求高,同时因钢拉杆工况及其恶劣,因而对钢拉杆材料、钢拉杆尺寸精度、表面粗糙度、热处理和表面强化、动平衡等要求十分严格。在大批量生产的条件下,传统工艺已不能满足当前设计和生产需求,在长时间、高速运转下,钢拉杆极容易过早出现失效或断裂,严重影响钢拉杆的寿命和整机可靠性。
发明内容
[0004]本发明的目的是提供一种电镦式钢拉杆端头锻造工艺,使其利于大批量的工业化的生产,并减少了锻造过程中出现夹污、充不满的现象,产品的力学性能进一步改善,节约了产品用料,提高了产品的模具寿命。
[0005]本发明的技术方案如下:
[0006] —种电镦式钢拉杆端头锻造工艺,包括以下步骤:
[0007] a、浇注钢锭
[0008]钢锭中化学成分重量百分比为:0.28% <C<0.35%,0.40<Si < 1.40%,0.40% < Mn< 1.40%,0.015% < P < 0.125%,0.006 < S < 0.026%,0.10<Ti <0.25%,2.50%< Cr < 3.50%,痕量< B ^ 0.0018%,0.08% ^ Cu < 0.15%,余量为铁及不可避免的杂质;浇注成型的钢锭温度降至350°C,再加热至600-700°C,保温3_5小时,炉冷至350°C,保温3小时,再加热至500-5800C,保温5-7小时,以20°C/小时冷却至300°C,再以20°C/小时,冷却至常温;
[0009] b、锻造步骤
[0010]在1150°C_850°C的温度范围内,将步骤a中所述钢锭反复镦粗-拔长使锻造比大[0011 ] 于5,以锻造用于所述钢拉杆;
[0012] c、热处理
[0013] 钢拉杆毛坯加热至850°C_870°C的温度范围并保温3-5h,油冷至不高于70°C后出油,之后重新加热至560°C_570°C的温度范围并保温6-7h,之后空冷;
[0014] d、将抛丸处理的零件包装。
[0015] 2、根据权利要求1所述电镦式钢拉杆端头锻造工艺,其特征在于,所述锻造步骤
[0016]在1000°C的温度范围内,将步骤a中所述钢锭反复镦粗-拔长使锻造比大于5,以锻造用于所述钢拉杆。
[0017]本发明通过上述技术方案,整体结构科学合理,使用时,只需将不同型号的钢拉杆,根据长短,由于具有可调节不同型号的适应性,生产时,只需一次将轴头加热到工艺所需温度,就可一次成型,由此,减少了多次加热和多次锻造的传统工艺麻烦,相应降低了能耗,减少了材料消耗和成本投入,加工精度大大提高,与现有技术相比材料利用率由现在的65%提高到90%以上,电能消耗降低70%左右,用工减少四分之三,一台机床二人操作单班可锻工件550件以上,提高工效4倍左右,产生的积极效果非常显著。
[0018]本发明的力学性能检测数据如下:
[0019]抗拉强度ob(MPa):2 18O(IlO)
[0020]屈服强度os(MPa): > 930(95)
[0021]伸长率δ5(%):之 12
[0022] 断面收缩率Φ(%): > 55
[0023]冲击功Akv(J): > 65
[0024]冲击韧性值akv(J/cm2): > 78(8)
[0025]硬度:S 223HB。
具体实施方式
[0026] —种电镦式钢拉杆端头锻造工艺,包括以下步骤:
[0027] a、浇注钢锭
[0028]钢锭中化学成分重量百分比为:0.28% <C<0.35%,0.40<Si < 1.40%, 0.40% < Mn< 1.40%,0.015% < P < 0.125%,0.006 < S < 0.026%,0.10<Ti <0.25%,2.50%< Cr < 3.50%,痕量< B ^ 0.0018%,0.08% ^ Cu < 0.15%,余量为铁及不可避免的杂质;浇注成型的钢锭温度降至350°C,再加热至600-700°C,保温3_5小时,炉冷至350°C,保温3小时,再加热至500-5800C,保温5-7小时,以20°C/小时冷却至300°C,再以20°C/小时,冷却至常温;
[0029] b、锻造步骤
[0030]在1000°C的温度范围内,将步骤a中所述钢锭反复镦粗-拔长使锻造比大[0031 ] 于5,以锻造用于所述钢拉杆;
[0032] c、热处理
[0033] 钢拉杆毛坯加热至850°C-870°C的温度范围并保温3_5h,油冷至不高于70°C后出油,之后重新加热至560°C_570°C的温度范围并保温6-7h,之后空冷;
[0034] d、将抛丸处理的零件包装。

Claims (2)

1.一种电镦式钢拉杆端头锻造工艺,其特征在于,包括以下步骤: a、饶注钢锭 钢锭中化学成分重量百分比为:0.28% < C < 0.35%,0.40 < Si < I.40%,0.40% < Mn <I.40%,0.015%< P < 0.125%,0.006 < S < 0.026%,0.10<Ti<0.25%,2.50%< Cr < 3.50%,痕量< B < 0.0018%,0.08% < Cu < 0.15%,余量为铁及不可避免的杂质;浇注成型的钢锭温度降至350°C,再加热至600-700 °C,保温3_5小时,炉冷至350°C,保温3小时,再加热至500-5800C,保温5-7小时,以20°C/小时冷却至300°C,再以20°C/小时,冷却至常温; b、锻造步骤 在1150°C-85(TC的温度范围内,将步骤a中所述钢锭反复镦粗-拔长使锻造比大 于5,以锻造用于所述钢拉杆; C、热处理 钢拉杆毛坯加热至850°C-870°C的温度范围并保温3-5h,油冷至不高于70°C后出油,之后重新加热至560°C_570°C的温度范围并保温6-7h,之后空冷; d、将抛丸处理的零件包装。
2.根据权利要求1所述电镦式钢拉杆端头锻造工艺,其特征在于,所述锻造步骤 在100tC的温度范围内,将步骤a中所述钢锭反复镦粗-拔长使锻造比大于5,以锻造用于所述钢拉杆。
CN201410047422.4A 2014-02-11 2014-02-11 一种电镦式钢拉杆端头锻造工艺 Expired - Fee Related CN103831587B (zh)

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EP0667196A1 (fr) * 1994-02-11 1995-08-16 Electroforge Industries S.A. Procédé pour la réalisation de structures mécaniques à tête pleine à partir de tubes et dispositif pour sa mise en oeuvre
CN1457942A (zh) * 2002-05-17 2003-11-26 广东工业大学 一种可实现工艺参数优化控制的电镦机
CN101564751A (zh) * 2009-04-28 2009-10-28 巨力索具股份有限公司 一种电镦式钢拉杆端头锻造工艺
CN102886646A (zh) * 2012-09-11 2013-01-23 昌利锻造有限公司 一种电镦式钢拉杆端头锻造工艺

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FR2838137A1 (fr) * 2002-04-03 2003-10-10 Usinor Acier pour la fabrication de moules pour le moulage par injection de matieres plastiques ou pour la fabrication d'outils pour le travail des metaux

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0667196A1 (fr) * 1994-02-11 1995-08-16 Electroforge Industries S.A. Procédé pour la réalisation de structures mécaniques à tête pleine à partir de tubes et dispositif pour sa mise en oeuvre
CN1457942A (zh) * 2002-05-17 2003-11-26 广东工业大学 一种可实现工艺参数优化控制的电镦机
CN101564751A (zh) * 2009-04-28 2009-10-28 巨力索具股份有限公司 一种电镦式钢拉杆端头锻造工艺
CN102886646A (zh) * 2012-09-11 2013-01-23 昌利锻造有限公司 一种电镦式钢拉杆端头锻造工艺

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