The present invention relates to a die and its usage for forging special-shaped connecting rods at both ends in a local die. There are two sets of half-dies whose cavity shape is the same as that at both ends of the special-shaped connecting rod. The lower end of the cavity has the same section as the shape of the rod, and the two half-dies form the moulds at both ends of the forming process. The outer die ring is locked into one outside; the bottom of the half-die has an open-close push-pull groove extending into the push-pull head, and the push-pull head is installed in the oil The front end of the plug rod; the opening block is loaded into the opening and closing push-pull groove and falls into the inner hole of the push-pull head, and the rotating shaft of the opening block is fixed on the half die. The usage is that two half-dies are opened, the hot ends of the special-shaped connecting rods at both ends are hoisted upward and placed in the middle of the half-dies, the push-pull heads are used to push the two half-dies together, and the outer die rings are clamped. The press drives the punch to press into the heated end of the semi-die, and the semi-finished product is formed. The semi-finished products are lifted out together, and the mould is replaced to form the other end. The invention can form two ends separately; the shape of forgings is regular; the die structure is simple, the half die is convenient to open and close, stable and reliable; and the demoulding is simple and free.
【技术实现步骤摘要】
用于局部模锻两端异形连杆的模具及用法
本专利技术属于大锻件模锻成形
,具体涉及一种用于局部模锻两端异形连杆的模具及用法。
技术介绍
两端异形连杆,例如船用柴油机连杆,是船舶发动机中的重要零件,两端分别与活塞杆、曲轴(曲柄)连接,起到将活塞的往复运动转变为曲轴的旋转运动,并将作用在活塞上的力传递给曲轴,实现运动和能的传递。连杆在工作中受到来自活塞的循环拉压,以及转化运动时产生的横向、纵向惯性力,所承受的应力状态复杂。因此,要求连杆既要具有较高的强度和抗疲劳性能,又要具有足够的刚性和韧性。大型船用柴油机连杆两端,外形复杂,重量及尺寸规格大,2t-6t,长度2m-3m。现有技术为自由锻+机械加工的方式生产,自由锻方式生产的现毛坯11(见图10),图中实线是毛坯外形,双点划线为连杆零件外形。现有技术存在以下几个突出问题:1、在自由锻方式下,连杆锻件厚端外球面、薄端锥面,自由锻无法精准锻出,只能锻成方台阶,经后续机械加工去除材料,得到外形尺寸,毛坯需要大量工艺辅料,次工艺辅料是自由锻锻造方式下必需的工艺辅料,无法克服,故造成原材料的巨大浪费,也造成了大量的机加工工时浪费;船用柴油机连杆两端的内凹面,自由锻无法锻出,自由锻只能全部锻成实心,后续机加工去除材料,得到内凹面;2、船用柴油机连杆外形复杂,而自由锻精度本身较低,因此通常需要预留40-50mm机加工余量,造成机加工工时的浪费。3、自由锻生产船用柴油机连杆毛坯,机械加工去除材料成形两端外形和内凹面,切断了金属纤维,破坏了锻造组织的连续性,削弱了锻造船用柴油机连杆的内部质量优势,对船用柴油机连杆的质量和寿命不 ...
【技术保护点】
1.用于局部模锻两端异形连杆的模具,其特征在于:有两组半模,半模的型腔形状与两端异形连杆两端外形一致,型腔下端有与两端异形连杆杆部形状一致段,每组的两个半模组成两端异形连杆局部两端分别成型的模具;两个半模由套在其外的外模圈固定锁合为一体;半模及外模圈置于支撑平台上;半模的底部设有伸入推拉头的开合推拉槽,所述推拉头安在油缸活塞杆前端;推拉头有落入开模挡块的内孔;开合推拉槽槽壁开有转轴安装槽,开模挡块装入转轴安装槽内,开模挡块两端有转轴,转轴通过固定板固定在半模上;模锻冲头的形状和尺寸与两端异形连杆的两端形状和尺寸一致,冲头安装在压机的动梁上。
【技术特征摘要】
1.用于局部模锻两端异形连杆的模具,其特征在于:有两组半模,半模的型腔形状与两端异形连杆两端外形一致,型腔下端有与两端异形连杆杆部形状一致段,每组的两个半模组成两端异形连杆局部两端分别成型的模具;两个半模由套在其外的外模圈固定锁合为一体;半模及外模圈置于支撑平台上;半模的底部设有伸入推拉头的开合推拉槽,所述推拉头安在油缸活塞杆前端;推拉头有落入开模挡块的内孔;开合推拉槽槽壁开有转轴安装槽,开模挡块装入转轴安装槽内,开模挡块两端有转轴,转轴通过固定板固定在半模上;模锻冲头的形状和尺寸与两端异形连杆的两端形状和尺寸一致,冲头安装在压机的动梁上。2.根据权利要求1所述的用于局部模锻两端异形连杆的模具,其特征在于:半模外表面为下大上小的圆锥面;半模外锥面、外模圈内锥面,锥度一致,锥度>1°。3.根据权利要求1所述的用于局部模锻两端异形连杆的模具,其特征在于:与两端异形连杆杆部形状一致段长度>30mm。4.局部模锻两端异形连杆模具的用法,其特征在于:具体步骤如下...
【专利技术属性】
技术研发人员:刘志勇,熊武,黄永强,陈飞,张承峰,陈国遂,刘长安,邹泉,潘小飞,林晨,刘振新,刘峰,
申请(专利权)人:武汉重工铸锻有限责任公司,
类型:发明
国别省市:湖北,42
还没有人留言评论。发表了对其他浏览者有用的留言会获得科技券。