摘要连杆广泛应用于各类机动车上,是传递力的重要构件。连杆的小头孔经活塞鞘与活塞连接,大头孔和曲轴连接。在机体中做平面运动,连杆 随着 进行圆周运动;连杆 随着 进行直线摆动运动;通过大头孔、小头孔的 ,连杆杆身的运动方式为复杂的摆动运动。连杆在运动过程中受力也是复杂的,受回环往复的 外,还需承受 的压力, 就是在些受力合成后形成的。为了承受复杂的交变载荷,对连杆提出了相当高的韧性、强度和 能的技术要求。 68712
本设计论文主要讲述的为汽车发动机连杆零件的 和其装备设计。为了承受复杂的交变载荷,对连杆提出了相当高的韧性、强度和 能的技术要求。连杆在加工的过程中,易产生形变,故在设计工艺规程时,就必须将各主要表面的加工工序分清楚,由粗到精。在每道工序中不断将连杆的 ,形位公差减小,在校正之后,可以达到使用要求。
毕业论文关键词: 连杆;加工工艺; ;加工精度;
ABSTRACT joint rod is one of the principal driving system of a car engine, its status is evident in engine. It is the major attachment of movement that can transfer the engine’s energy. the small connecting rod run the up and down with the piston;the big connecting rod is rolling in high speed with crankshaft; the connecting rod’s do the complex swing with the big and small connecting rod’s movement. Beside it is stood by the reciprocating inertia force, also under great pressure and gas pressure, the gas pressure and inertia synthesis alternating load, formed under the requires connecting rod fatigue resistance, impact resistance, and possess enough intensity, stiffness and good toughness.
This text specify mostly the machine technology and the design of griping equipment of the joint rod. The accurateness of measure, the accurateness of outline and the accurateness of location , of the joint rod is needed quite , and the stiffness of the joint rod is far not enough, and schedule the craft lessons, need to part the each main and surface thick complete machining course. Lessen the function of processing remaining , cutting force or internal stress development , update the distortion after processing, can get the specification demand for the finally part .
Keyword: Connecting rod;Processing technology; Deformation;Design of clamping device; Precision
目 录
摘要Ⅰ
AbstractⅡ
第 1 章 绪论6
1.1课题背景和意义6
1.3设计中主要内容9
第 2 章 发动机连杆加工工艺10
2.1 连杆的特点结构 10
2.2 连杆的毛坯和材料 11
2.3 连杆主要技术的要求 12
2.3.1 大、小头孔轴心线于轴心线上的平行度 12
2.2.3 大、小头孔中心距 12
2.2.4 连杆大头孔两端面对大头孔中心线的垂直度13
2.2.5 螺栓孔 13
2.2.5 大、小头孔两端面13
2.4 对连杆进行机械制造工艺规程设计 13
2.5对加工工艺规程的分析16
2.5.1 工艺规程的设计 16
2.5.2 选择定位基准 16
2.5.3 制定较为稳定的夹紧方法17
2.5.4 主要表面的加工方法 17
2.6 各工序的加工余量、计算工序尺寸及公差 17
2.6.1 加工余量的确定 17
2.8.2工序尺寸及其公差的确定18
2.9 工艺尺寸链的计算 19