The thin-walled box of large tractor is easy to deform and requires high machining accuracy.During fixture design, improper selection of positioning datum and pressing point can easily lead to deformation of parts, which leads to the machining accuracy not meeting the drawing requirements.By using CAE software combined with machining requirements, multiple schemes of positioning and clamping points are compared, which vividly shows the influence of different schemes on the processing accuracy of the box.Through the optimization and improvement of the scheme and the actual machining verification, the machining accuracy required by the drawing is achieved, and the accuracy of fixture design and the machining accuracy of parts are improved.

以直齿锥齿轮为研究对象，基于展成法刨齿原理，利用Visual Basic语言开发了修形直齿锥齿轮齿面点计算软件。利用该软件计算出的齿面点数据，在UG软件中建立了直齿锥齿轮三维数学模型，并进行了接触区动态仿真分析。依据该模型在五轴加工中心上加工出了标准齿轮，并且接触区和噪声情况良好。该建模方法在直齿锥齿轮建模中具有通用性。

拖拉机薄壁箱体零件结构复杂,加工精度要求高,工艺设计时,若工艺基准选择不当极易导致零件加工精度无法达到图纸要求.运用计算机辅助工程(computer aided engineering,CAE)软件,在工艺设计之前进行相应的计算分析,直观地了解不同方案对箱体加工精度的影响,并通过方案优化改进,找到一种最优的工艺方案,可提高工艺方案的准确性和零件的加工精度.

针对钳工齿顶修缘方法精度低、一致性差、效率低以及专用机床柔性差、调整困难等问题,提出一种弧齿锥齿轮齿顶修缘方法.依据弧齿锥齿轮理论数学模型定义齿面和修缘带边界,求解对刀点三维坐标和加工刀轨,后处理生成数控加工程序,在5轴4联动数控机床上完成夹紧和对刀后,控制锥度铣刀与弧齿锥齿轮的相对运动,完成弧齿锥齿轮齿顶的高效精确修缘.该方法具有新颖性、创造性和实用性的特点.

提供一种拖拉机变速箱体油道孔泄漏检测封堵组件的设计及封堵方法的研究,封堵面板合件、螺纹孔堵块合件和内胀堵头合件分别对拖拉机变速箱体的3种油道孔进行封堵,一次装卸零件可以完成拖拉机变速箱体上全部油道孔的泄漏检测.该封堵组件通用性强,结构简单,操作简便高效,已获国家实用新型专利授权.

A valve block assembly used in leak detecting for tractor transmission is proposed. The valve block assembly in-cludes a plurality of valve, each valve is controlled by distribution box,which realize the oil passage leak detection with one in-stalling and disassembling,and is easy to make,as well as flexible installation and remove. It can be used in other plug assem-bly and leak detection devices for detecting a number of varieties tractor transmissions. It also can be extended to other deflec-ting structure, and has a good value.

针对拖拉机传动系变速箱体液压、润滑油道孔的使用条件,设计了一种应用于多机型拖拉机变速箱体油道孔泄漏检测的装置,一次装卸可实现全部油道孔的泄漏检测.研究及试验结果表明,该装置结构合理,操作简便,检测效率高,通用性强,可推广应用于其他箱体油道孔泄漏检测.

A compact hydraulic clamping chuck was introduced,positioning with build-in spring top and end-face,clamping with elastic collet. Using this chuck,the length of the workpiece machined was increased,the axial and radial positioning was more pre-cise,and the clamping force was more stable and reliable. Then examples were used to illustrate the effect of the application of the chuck.

通过该项目的研究,验证柴油机缸体加装工艺气缸盖预紧后珩磨加工湿式气缸套内孔工艺,能够提高柴油机装配气缸盖后的气缸套内孔圆柱度精度,提升柴油机的产品品质.

对法兰断裂的驱动轮轴进行了材料检测和断口分析,采用有限元计算方法分析了驱动轮轴法兰圆角在标定工况下的应力分布.结果表明,法兰圆角的应力集中导致了驱动轮轴的疲劳断裂,在圆角附近的轴颈上增加一个环形应力卸荷槽,可以缓解应力集中,避免驱动轮轴的疲劳断裂.

Aiming at insufficient machining allowance when the top and bottom surfaces and main bear seat surfaces of cylinder block are milled roughly,the deflection of cylinder clamping position is measured.At the same time,the CAD model is established.The effective solution is found through CAE simulation.

Manual assembly method is used for bearing assembly in the transmission system of large wheeled tractors, and this method can not adapt to requirement of modern enterprise production. In order to improve the quality of bearing assembly and lighten the working intensity of operators, several kinds of traditional assembly processes of bearings are improved. Improved assembly processes are introduced, and then their technical main points are also analyzed.

The paper introduced that YTO group corporation has achieved collinear processing of E series and Xiaokangpan gearbox housing by the technological transformation.This process improvement has certain reference to machining process for the box-type parts.