角磨机在盗窃线缆案中形成痕迹特点分析  

Analysis of Trace Characteristics Formed by Angle Grinder in Cable Theft Cases

作　　者：陈小松 卞可可 张桦蕲 韦刚 CHEN Xiaosong;BIAN Keke;ZHANG Huaqi;WEI Gang(Criminal Technology Detachment of Chongqing Railway Public Security Division,Chongqing 400030,China)

机构地区：[1]重庆铁路公安处刑事技术支队,重庆400030

出　　处：《刑事技术》2025年第2期148-153,共6页Forensic Science and Technology

摘　　要：角磨机是一种可用于对金属、木材、塑料等材料进行磨削加工的工具,近年来频繁出现在一些盗窃铁路线缆案件中。由于该工具形成的切割痕迹与锯类工具有相似之处,给实际案件中分析判断工具种类带来一定难度。本文通过模拟实验,使用角磨机、钢锯切割不同规格的铜芯线缆,显微镜观察线缆断端处形成的工具痕迹,归纳、总结两者形成的工具痕迹的特点及差异。观察发现,角磨机与钢锯切割形成的线缆断端截面形态整体相似,均较平整,但钢锯形成断端截面形态多呈阶梯状,角磨机切割形成的则较平滑;角磨机在断面处会形成一定弧度且呈平行排列的线条痕迹,钢锯形成的线条痕迹则呈多直线且存在相互交叉的情形;同时两者在形成的起点痕迹、终端痕迹及切屑形态上均存在一定差异。对角磨机切割线缆形成的工具痕迹特点及形成机制的研究,能够为相关案件中判断工具种类提供一定的理论支撑。Angle grinder is a tool used for grinding metal,wood,plastic and other materials.In recent years,it frequently appears in some cases of railway cabbe theft.Because the cutting marks formed by angle grinder are similar to saw tools,it is diffi cult to analyze and judge the types of tools in practical cases.In the paper,through simulation experiments,angle grinder and hacksaw were used to cut copper-core cables of different specifi cations,and the tool marks formed at the broken ends of cables were observed by microscope,to summarize the characteristics and differences of the tool marks formed by the two.It was found that the cross-sectional shapes of the cable broken end cut by angle grinder and hacksaw were similar overall,both of which were fl at,but most of them were stepped by hacksaw,while those cut by angle grinder were smooth.Angle grinder will form parallel line traces with a certain radian at the section,while hacksaw will form multiple straight lines and cross each other.At the same time,there are differences between them in starting point trace,terminal trace and chip morphology.In actual case analysis,we should make a comprehensive judgment based on the cable broken end position,cable diameter and other conditions,and emphasize the differences in traces formed by angle grinder and saw tool.The research on the characteristics and formation mechanism of tool marks formed by tool marks formed by angle grinder cutting cables can provide certain theoretical support for judging the types of tools in related cases.

关 键 词：角磨机 切割 跳痕 线条痕迹 切屑 

分 类 号：DF794.1[政治法律—诉讼法学]