学位论文j53400摩擦压力机液压顶出系统设计.docx

1、学位论文j53400摩擦压力机液压顶出系统设计 毕业论文（设计）中文题目： J53-400摩擦压力机液压顶出系统设计 英文题目：J53-400Hydraulic friction press ejecting system design 毕业专业：汽 车 机 械 制 造 技 术学生姓名： 准考证号： 指导教师： 二零一四 年 十二 月中文摘要作为现代机械设备实现传动与控制的重要技术手段，液压技术在国民经济各领域得到了广泛的应用。与其他传动控制技术相比，液压技术具有能量密度高配置灵活方便调速范围大工作平稳且快速性好易于控制并过载保护易于实现自动化和机电液一体化整合系统设计制造和使用维护方便等多种

2、显著的技术优势，因而使其成为现代机械工程的基本技术构成和现代控制工程的基本技术要素。 液压压力机是压缩成型和压注成型的主要设备，适用于可塑性材料的压制工艺。如冲压、弯曲、翻边、薄板拉伸等。也可以从事校正、压装、砂轮成型、冷挤金属零件成型、塑料制品及粉末制品的压制成型。本文根据小型液压压力机的用途特点和要求，利用液压传动的基本原理，拟定出合理的液压系统图，再经过必要的计算来确定液压系统的参数，然后按照这些参数来选用液压元件的规格和进行系统的结构设计。顶出装置是为顶出模内工件而设置的。各种合模装置均设有顶出装置，一般分为机械顶出、液压顶出和气动顶出三种。 (1)机械顶出，顶杆固定在机架上，它本身不

3、移动，开模时移动模板后退，顶杆穿过移动模板上的孔而到达模具推板，阻止模具推出机构随动模后移，将制件顶出。顶杆长度可以根据模具的厚薄及型腔深度通过螺纹调节。顶杆的数目、位置随合模装置的特点、制件的大小而定。机械顶出结构简单，顶出力大，工作可靠，但顶出是在开模终了时进行的，对制品的冲击较大，模具内推板的复位要在闭模时进行。(2)液压顶出，利用装在摩擦压力机内的小型顶出液压缸和顶出杆来实现制品顶出，顶出力、速度、位置、行程和顶出次数可由液压系统、控制系统进行调节。液压顶出有以下几个优点: 1.顶出的动作时间(动作位置)与摩擦压力机的开、合模行程没有直接关系，能在开模过程中以及开模后顶出制件。 2.顶

4、出力、顶出速度可调，因此，即使是薄壁的产品，也不易使产品变形或损坏，可以顺利地进行脱模。 3.顶杆可以多次反复地进行冲击动作，因此可以使产品可靠地自动掉落。 4.在成型有嵌件的产品时，能够使顶杆在合模之前自行复位，插入嵌件比较方便，液压顶出装置有利于缩短摩擦压力机循环周期和实现自动化生产。关键词：摩擦压力机 滑块 预冲液阀 顶出机构 AbstractAs one of the modern mechanical equipment to achieve an important technical means of power transmission and control, hydraul

5、ic technology has been widely applied in various fields of the national economy. Compared with other drive control technology, hydraulic technology with high energy density, convenient and flexible configuration, wide range of speed regulation, smooth and fast is good, easy to control and overload p

6、rotection, easy to realize automation and electromechanical integration, system design and manufacture and use and maintenance is convenient wait for a variety of significant technical advantages, which make it become the basic constitution the technology of modern mechanical engineering and modern

7、control engineering of the basic elements of technology. The hydraulic press is the main equipment of compression molding and injection molding, pressing technology is applicable to the plasticity of materials. Such as stamping, bending, flanging, sheet drawing. Can also be engaged in pressing corre

8、ction, pressure mounted, wheel molding, cold extrusion molding, metal parts, plastic products and powder products. In this paper, according to the use of small hydraulic press machine characteristics and requirements, using the basic principles of hydraulic transmission, and draw up a reasonable hyd

9、raulic system diagram, and then through the necessary calculations to determine the parameters of hydraulic system, structure design and then according to these parameters to choose the specifications of the hydraulic components and system. The ejecting device is set to top mold workpiece. All kinds

10、 of mold closing device are provided with a push out device, generally divided into mechanical ejection, hydraulic ejector and pneumatic ejector three.(1) mechanical top, the top rod is fixed on the frame, it itself does not move, when the mould is opened mobile template back, pushing rod passes thr

11、ough the hole on the mobile template and to the mold push plate, prevent mold ejecting mechanism with dynamic model after the shift, will make a top out. Length of the push rod according to the thickness and depth of cavity mould through the thread adjusting. The number, pole position with the clamp

12、ing device characteristics, depending on the size of the workpiece. Mechanical top has the advantages of simple structure, high power, reliable work, but the ejector is carried out in the opening at the end of products, the impact of large, mold the reset push plate is to be done in the mould is clo

13、sed. (2) hydraulic ejector, the use of hydraulic cylinder and the ejector rod to realize the product out of the top small top mounted on the friction press in output, speed, position, top, travel and ejection times can be adjusted by the hydraulic system, control system. Hydraulic ejector has the fo

14、llowing advantages:1 out of the top of the time of action (action position) has no direct relationship with the friction press, mold opening stroke, to the top of the workpiece in the open mold process and after the mold opening.2 top output, top speed is adjustable, therefore, even thin-walled prod

15、ucts, also not easy to cause deformation or damage of the product, can be carried out smoothly release.The 3 push rod can be repeatedly impact action, so you can make the product reliable automatic drop.4 in the molding insert product, can make the push rod by itself in the mold before the reset, insert insert more convenient, hydraulic ejector device can shorten the cycle of friction press and automated production.key word: Friction press slide pre flushing valve ejector mechanism目 录 第一章了解液压顶料系统的作用及工作原理，确定液压顶料系统方案 2第二章 确定液压系统参数 32.1液压缸工作压力的确定 32.2液压缸内径D和活塞杆直径d的确定 22.3 油缸的流量 .