Long arm excavator is a kind of excavator with long arm, which has a wide range of work and can effectively carry out long-distance operation. It is widely used in river dredging, dredging and building demolition engineering.

长臂挖掘机是在普通挖掘机的基础上，通过优化整机的稳定性和可靠性，进而改进发动机、液压系统、工作方式和结构部件而制成的。可以看出，所有的变化都来自挖掘机动臂长度的变化。动臂一直是挖掘机的重要组成部分，其结构尺寸大，工作时承受的冲击力大，因此对其加工质量要求较高。在机械生产中，对大型结构件的加工质量要求很高。在机械生产中，大型结构件的加工精度控制一直是一个技术难题。长臂尺寸大，加工精度要求高，因此长臂的加工质量是长臂挖掘机生产中的首要问题。

Based on the common excavator, the long arm excavator is made by optimizing the stability and reliability of the whole machine, and then improving the engine, hydraulic system, working mode and structural components. It can be seen that all the changes come from the change of excavator boom length. Boom has always been an important part of the excavator, its structure size is large, the impact of work is large, so its processing quality requirements are high. In mechanical production, the processing quality of large structural parts is very high. In mechanical production, machining accuracy control of large structural parts has always been a technical problem. The size of long arm is large and the machining accuracy is high, so the machining quality of long arm is the primary problem in the production of long arm excavator.

1.加工可制造性分析

1. Manufacturability analysis

长臂是一种结构复杂、体积大、质量大的细长构件，焊接成型后需要加工。加工长臂时，需要加工平面、孔系和螺纹孔，加工内容多，结构复杂，加工精度要求高。此外，对于这种质量较大的细长构件，加工时刚度较低，加工时容易产生变形和振动。

Long arm is a kind of slender component with complex structure, large volume and mass, which needs to be processed after welding. When machining long arm, it needs to process plane, hole system and threaded hole. There are many machining contents, complex structure and high machining accuracy. In addition, for this kind of slender member with large mass, its stiffness is low during processing, and it is easy to produce deformation and vibration during processing.

2.加工设备的选择

2. Selection of processing equipment

加工设备不仅包括加工机床、工具和量具，还包括专用机床夹具。机床的选择和机床夹具的设计直接关系到长臂的加工质量和生产效率。从长臂的结构特点来看，传统机床已不能满足加工要求，如何保证加工过程中的刚度和抗冲击能力，并提供合理的定位和有效的夹紧，也是此类大型结构件夹具设计的一个主要问题。

Processing equipment includes not only processing machine tools, tools and measuring tools, but also special machine tool fixtures. The selection of machine tool and the design of fixture are directly related to the processing quality and production efficiency of long arm. From the structural characteristics of the long arm, the traditional machine tool can not meet the processing requirements. How to ensure the stiffness and impact resistance in the processing process, and provide reasonable positioning and effective clamping, is also a major problem in the fixture design of such large structural parts.

3.加工机床

3. Processing machine

随着计算机技术的飞速发展，加工设备的技术水平也有了突飞猛进的发展。出现了各种高精度、大功率和长冲程的床。除了可自由伸缩的镗轴，机床还有一个可自由伸缩的防滑枕。前端直径较大的铣轴可带动安装在防滑枕前端的教学铣头、能源铣头、生产铣头、水平转盘等各种附件，实现大直径、大平面的重切削，一次装夹完成多面多工序加工。数控四轴联动技术可以完成长臂上所有孔、平面和螺纹孔的铣削或镗削。加工时，长臂可以通过机床的数控系统定位在机床的工作台上，然后用专用机床夹具夹紧。机床的两个主轴可以同时铣削每个主装配孔的两个端面，以保证工件的刚性和加工精度，然后用一个主轴粗加工和精加工每个装配孔。大多数类型的长臂可以在一次夹紧中完成所有加工行程。一端加工后，工件可以移动，重新对齐和夹紧，另一端可以加工，以避免多次夹紧。

With the rapid development of computer technology, the technical level of processing equipment also has a rapid development. There are various kinds of high precision, high power and long stroke beds. In addition to the freely retractable boring shaft, the machine tool also has a freely retractable anti-skid pillow. The milling shaft with larger front diameter can drive the teaching milling head, energy milling head, production milling head, horizontal turntable and other accessories installed at the front end of the anti-skid pillow to realize heavy cutting of large diameter and large plane, and complete multi face and multi process processing with one clamping. CNC four axis linkage technology can complete the milling or boring of all holes, plane and threaded holes on the long arm. During machining, the long arm can be positioned on the worktable of the machine tool through the numerical control system of the machine tool, and then clamped with a special machine tool fixture. The two spindles of the machine tool can mill the two end faces of each main assembly hole at the same time to ensure the rigidity and machining accuracy of the workpiece, and then rough and finish each assembly hole with one spindle. Most types of long arms can complete all machining strokes in one clamping. After one end is machined, the workpiece can be moved, re aligned and clamped, and the other end can be machined to avoid multiple clamping.

4.切削参数的选择

4. Selection of cutting parameters

为了保证加工表面的精度和表面质量，大多数加工表面都是通过粗加工和精加工来完成的，不同的刀具对粗加工和精加工有不同的切削参数。在粗加工中，当加工系统的刚度和机床的功率允许时，切削参数应尽可能大。切削深度一般为5-6mm，主轴转速为200-300e/min，精铣时主轴运动速度为220mm/min，精镗时为100-150mm/min。

In order to ensure the accuracy and quality of the machined surface, most of the machined surfaces are completed by rough machining and finish machining. Different tools have different cutting parameters for rough machining and finish machining. In rough machining, when the rigidity of the machining system and the power of the machine tool are allowed, the cutting parameters should be as large as possible. Generally, the cutting depth is 5-6 mm, the spindle speed is 200-300 E / min, the spindle speed is 220 mm / min in finish milling and 100-150 mm / min in finish boring.

长臂的加工一直是生产中的难题。上述加工工艺已应用于长臂的批量生产，不仅保证了产品质量，而且提高了生产效率。机床的性能和精度保证了长臂的加工质量。

The processing of long arm is always a difficult problem in production. The above processing technology has been applied to the mass production of long arm, which not only ensures the product quality, but also improves the production efficiency. The performance and accuracy of the machine ensure the machining quality of the long arm.

感谢您的阅读，希望以上内容对您有所帮助，如想了解更多资讯内容请点击 华体会国际 出租//www.wondgo.com

Thank you for your reading. I hope the above content will be helpful to you. For more information, please click lengthen arm excavator //www.wondgo.com