首页> 外国专利> Method and apparatus for joining a metal-ceramic heat shield to a piston, engine valve or the like by a casting technique

Method and apparatus for joining a metal-ceramic heat shield to a piston, engine valve or the like by a casting technique

机译:通过铸造技术将金属陶瓷隔热罩连接到活塞,发动机气门等的方法和装置

摘要

The proposal is for a method for the production of a reciprocating component of an internal combustion engine subjected to combustion heat with a thin, metal-ceramic heat shield. In this method the heat shield (1) is, before casting on the component body, placed face downwards on a recess (12) provided in the casting mould (10,11), with sealing contact all the way round at the edges only, then curved slightly into the recess (12) by the action of a force and, in the process, prestressed, and held in this curved shape by an applied suction force. The component body is then cast onto the heat shield (1), the curvature of the heat shield being maintained by the suction force until the material of the component body solidifies. This curvature is maintained during the use of the component, even at the operating temperature, and is preferably just great enough to ensure that the internal stresses in the heat shield caused by the temperature gradient between the front side (2) of the heat shield, subjected to combustion heat, and the cooler rear side (3) of the heat shield and the resulting differences in expansion can be largely relieved. Protection also extends to the apparatus for carrying out the method and to the component produced in this way. IMAGE
机译:该提议是关于一种用于制造内燃机的往复运动部件的方法,该内燃机具有薄的金属陶瓷隔热罩,经受燃烧热。在这种方法中,将隔热罩(1)在浇铸到组件主体之前,朝下放置在浇铸模具(10,11)上的凹口(12)上,并始终在边缘处进行密封接触,然后在力的作用下稍微弯曲到凹槽(12)中,并在此过程中对其施加预应力,并通过施加的吸力将其保持在该弯曲形状中。然后将部件浇铸到隔热板(1)上,通过吸力保持隔热板的曲率,直到部件的材料固化。即使在工作温度下,该弯曲也可在组件使用期间保持,并且优选刚好足够大,以确保由隔热板正面(2)之间的温度梯度引起的隔热板内部应力,受到燃烧热的影响,隔热罩的较冷的后侧(3)以及由此产生的膨胀差异可以大大缓解。保护也扩展到用于执行该方法的设备和以这种方式生产的部件。 <图像>

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