预切槽机上单把切刀的切削载荷特性

为了研究预切槽机上切刀在开挖过程中的受载特性,建立了单把切刀水平推进载荷计算模型,并运用LS-DYNA软件模拟单把切刀切削岩土的过程,分析不同切削深度及刀刃角对切刀水平推进载荷的影响规律.结果表明:切刀水平推进载荷远大于垂直载荷,水平载荷随着切削深度的增大而增大;相同切削深度下,切刀水平载荷随刀刃角的增大而增大,刀刃角从80°增大到125°,各个切削深度下水平载荷平均增大30.7%;切刀比能耗随着刀刃角的增大呈先减小后基本不变的趋势,在刀刃角为110°时,切刀切削效率最高,且切刀比能耗随着切削深度的增大而减小.

Cutting Load Characteristics of a Single Cutter on the Pre-cutting Machine

In order to study the cutting load characteristics of cutters on the pre-cutting machine in the grooving process， a load calculation model of a single cutter’s horizontal cutting was established and its rock-cutting process was simulated using LS-DYNA to analyze the influence of different cutting depths as well as varied blade angles on the horizontal load. The results showed that the horizontal cutting load is much greater than the vertical cutting load， and the horizontal load increases as the cutting depth increases. In condition of the same cutting depth， the horizontal load increases with the increment of blade angles， and it was found that when the blade angle increases from 80°to 125°， the average magnitude of horizontal load at different depths increases by 30.7%. Generally， with the increment of the cutter’s blade angle， the specific energy increases firstly and then remains stable. The rock-cutting efficiency reaches its maximum status when the blade angle is 110°，and the specific energy decreases with the increment of cutting depths.