气门阀座底孔深度测量方案设计及验证

李健巍，刘丁丁，张卫兵

潍柴动力股份有限公司，山东  潍坊  261061

摘要：为解决发动机气缸盖气门阀座底孔深度检测困难问题，对气门阀座底孔的技术要求进行详细分析，设计阀座深度测量方案及专用工具。测量工具由测量块、探针、螺钉、紧固套、千分表和标准块组成，以标准块U型槽的深度为基准，根据千分表指针的摆动距离计算阀座底孔深度。测量工具的测量系统分析（measurement system analysis，MSA）验证结果表明，量具的重复性和再现性符合要求，适用于阀座底孔深度的测量。该量具能快速准确地测量阀座底孔深度，结构简单紧凑，使用方便，满足生产线的检测效率和精度要求。

关键词：气缸盖；阀座底孔深度；测量；量具；MSA

Design and verification of depth measurement scheme for bottom hole of valve seat

LI Jianwei, LIU Dingding, ZHANG Weibing

Weichai Power Co., Ltd., Weifang 261061, China

Abstract：To solve the difficulty in measuring the depth of the valve seat bottom hole in the engine cylinder head, a detailed analysis is conducted on the technical requirements of the valve seat bottom hole, and a valve seat depth measurement plan and special tools are designed. The measuring tool consistes of a measuring block, probe, screw, fastening sleeve, dial gauge, and standard block. Based on the depth of the Ushaped groove of the standard block, the depth of the valve seat bottom hole is calculated based on the swing distance of the dial gauge pointer. The measurement system analysis (MSA) validation results of the measuring tool indicates that the repeatability of the measuring tool meets the requirements and is suitable for measuring the depth of the valve seat bottom hole. This measuring tool can quickly and accurately measure the depth of the bottom hole of the valve seat, has a simple and compact structure, is convenient to use, and meets the inspection efficiency and accuracy requirements of the production line.

Keywords:cylinder head; depth of valve seat bottom hole; measurement; measuring tool; MSA