车辆工程毕业设计87捷达发动机连杆加工工艺设计及夹具设计

本科学生毕业设计

捷达发动机连杆加工工艺及其夹具设

计

院系名称：汽车与交通工程学院

专业班级：车辆工程

学生姓名：

指导教师：

职称：讲师

The Graduation Design For Bachelor's Degree Processing Technology of Jetta’s Engine Connecting Rod and Fixture Design

Candidate：JinZhao

Specialty：Vehicle Engineering

Class：BW 07-3

Supervisor：Lecturer ZhuRongFu

Heilongjiang Institute of Technology

摘要

连杆是柴油机的主要传动件之一，其在发动机中的地位是显而易见的。它是发动机传递动力的主要运动件，在机体中做复杂的平面运动，连杆小头随活塞作上下往复运动；连杆大头随曲轴作高速回转运动；连杆杆身在大、小头孔运动的合成下作复杂的摆动。连杆在承受往复的惯性力之外，还要承受高压气体的压力，在气体的压力和惯性力合成下形成交变载荷，这就要求连杆具有耐疲劳、抗冲击，并具备足够的强度、刚度和较好的韧性。

本文主要论述了连杆的加工工艺及其夹具设计。连杆的尺寸精度、形状精度以及位置精度的要求都很高，而连杆的刚性比较差，容易产生变形，因此在安排工艺过程时，就需要把各主要表面的粗精加工工序分开。逐步减少加工余量、切削力及内应力的作用，并修正加工后的变形，就能最后达到零件的技术要求。

关键词: 连杆；加工余量；精度；变形；加工工艺；夹具设计

ABSTRACT

The connecting rod is one of the main driving medium of diesel engine, its status is obvious in engine. It is the main accessory of movement which can transmit the engine’s power. It can do the complex movement in the plane, 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 expounds mainly the machining technology and the design of clamping device of the connecting rod. The precision of size, the precision of profile and the precision of position , of the connecting rod is demanded highly , and the rigidity of the connecting rod is not enough, easy to deform, so arranging the craft course, need to separate the each main and superficial thick finish machining process. Reduce the function of processing the surplus , cutting force and internal stress progressively , revise the deformation after processing, can reach the specification requirement for the part finally .

Keyword: Connecting rod；Deformation；Machining allowance；Precision；Processing technology；Design of clamping device

目录

摘要 (Ⅰ)

Abstract (Ⅱ)

第 1 章绪论 (1)

1.1课题研究现状、选题目的和意义 (1)

1.2国内外研究状况和和相关领域中已有的研究成果 (3)

1.3设计的主要内容 (4)

第 2 章汽车连杆加工工艺 (4)

2.1连杆的结构特点 (4)

2.2 连杆的主要技术要求 (5)

2.2.1 大、小头孔的尺寸精度、形状精度 (6)

2.2.2 大、小头孔轴心线在两个互相垂直方向的平行度 (6)

2.2.3 大、小头孔中心距 (6)

2.2.4 连杆大头孔两端面对大头孔中心线的垂直度 (6)

2.2.5 大、小头孔两端面的技术要求 (6)

2.2.6 螺栓孔的技术要求 (6)

2.2.7 有关结合面的技术要求 (7)

2.3 连杆的材料和毛坯 (7)

2.4 连杆的机械加工工艺过程 (8)

2.5 连杆的机械加工工艺过程分析 (11)

2.5.1 工艺工程的安排 (11)

2.5.2 定位精准的选择 (11)

2.5.3 确定合理的夹紧方法 (13)

2.5.4 连杆两端面的加工 (13)

2.5.5 连杆大、小头孔的加工 (13)

2.5.6 连杆螺栓孔的加工 (14)

2.5.7 连杆体与连杆盖的铣开工序 (14)