干切削加工刀具

适宜的刀具材料和刀具几何参数是干切削加工的关键条件之一。本文在分析干切削加工对刀具要求的基础上,阐述了干切削刀具设计的要点。     

振动切削深孔加工技术（上）：振动切削深孔概述

至今国内在深孔加工上存在的问题较多,许多厂家仍沿用落后的传统工艺,加工质量差,效率低。为改变这种落后状态,许多高校、院所和企业都在不断开发新工艺,新技术,有的已经取得很好的效果。为使科研成果尽快应用到生产实际中去,本刊将连载“振动切削深孔加工技术”,为企业的技术改造提供一项良好的技术措施,以期在“八五”期间更好的推广应用。     

干切削加工技术

1.问题的由来金属切削液在金属切削、磨削加工过程中具有相当重要的作用。选用合适的金属切削液,能降低切削温度60～150℃,提高表面质量1～2级,减少切削阻力15%～30%,成倍地提高刀具和砂轮的使用寿命。并能把切屑和灰末从切削区冲走,因而提高了生产效率和产品质量。故它在机械加工中应用极为广泛。     

干切削加工刀具及其设计

适宜的刀具材料和刀具几何参数是干切削加工的关键条件之一.在分析干切削加工对刀具要求的基础上,阐述了干切削刀具设计的要点,并结合应用实例说明了刀具设计对干切削加工的重要性.     

深孔高速切削加工技术应用研究

论述了深孔高速切削加工技术的原理和实施方案。     

干切削加工刀具及其设计

适宜的刀具材料和刀具几何参数是干切削加工的关键条件之一。文章在分析干切削加工对刀具要求的基础上,阐述了干切削刀具设计的要点,并结合应用实例说明了刀具设计对干切削加工的重要性     

高速干切削技术研究

随着工业的发展,对切削加工提出了越来越高的要求,就是既要向高效率、高精度、自动化的方向发展,同时又要满足加工过程的经济性和生态性的要求。高速干切削技术正是满足这一要求的先进制造技术。高速干切削技术是采用高效率的数控加工手段获得高精度,同时又因限制使用切削液,消除了切削液带来的环境污染、危害工人健康、增加制造成本等负面影响,实现了绿色生产。     

深孔加工的切屑处理

一、概述随着机械工业的发展,在现代切削加工中,切屑处理问题占有重要的地位,控制切屑的形状及其大小对生产的正常进行及操作工人的安全有重大影响。而深孔加工的切屑处理不当,使得有限的空间内切屑不能正常排除,必会导致加工不能正常进行,造成切屑堵塞、深孔钻崩坏...     

干切削加工及其措施

由于切削液具有良好的冷却和润滑特性,因此被广泛应用于切削加工。但是随着环境保护要求的日益严格和废物处理费用的不断增加,企业不得不采取措施为减少切削液的使用量。而要彻底消除使用切削液所带来的负面影响,一种可行的方法就是采用干切削加工技术。文章分析了影响干切削加工的因素以及实现干切削加工的措施,并列举了一个国内外的研究与应用实例。     

准干式深孔加工系统构建

综合多种现代绿色冷却润滑的优点,并结合深孔加工的特点,采用以油膜附水滴为冷却润滑介质,结合新型的负压抽屑装置和复合喷雾装置,构成准干式深孔加工系统.准干式深孔加工系统变传统的浇注式深孔加工为新型环保的半干加工,实现深孔加工的准干式切削,在深孔加工的环境污染和能源损耗的问题上有突破性进展.系统设计的主要部分包括复合喷雾装置设计、负压抽屑装置设计、绿色切削液研制以及MOL技术应用.     

车削深孔螺纹的方法

对大直径深孔螺纹,特别是车单头或多头方牙螺纹的加工进行了分析,为了避免造成大直径深孔螺纹的中径成为锥度,设计了一套组合刀杆.经过实践验证,此组合刀杆结构简单,容易制造,使用方便,既解决了如何加工此类螺纹,又提高了此类螺纹的切削效率和加工精度.     

乳化型深孔切削液的切削试验与分析

对切削液的类型和功能进行阐述,比较几种切削液的功能和切削特点,根据内排屑深孔加工的特点和对切削液的要求,选择几种乳化型切削液进行钻削试验。通过对比试验及结果分析,确定出能适应深孔钻削加工的乳化型切削液,可以满足深孔钻削加工中对刀具的冷却润滑和排屑效果,从而可以减少对切削油的使用,降低生产成本及对环境的污染。     

干切削的刀具和切削条件选择

介绍适用于干切削的刀具设计和切削加工参数的选择。     

Hole roundness in deep-hole drilling as analysed by Taguchi methods

This work investigates the roundness of holes by application of Taguchi methods to BTA deep-hole drilling with reference to process factors. Taguchi methods and statistical techniques are used in experimental layout, in the analysis of each control factor, and in prediction of the optimum setting for control factors. A set of confirmatory tests is then conducted to verify the estimated response. Influences of the control factors are discussed, and the levels of factors that produce holes of desired roundness with sufficient robustness are presented.     

Specific cutting force, tool wear and chip morphology characteristics during dry drilling of austempered ductile iron (ADI)

Dry machining is being recognized as ecological machining due to its less environmental impact and manufacturing cost. However, the choice of dry machining is mainly influenced by the workpiece material properties, machining operation and cutting conditions. The recent emergence of austempered ductile iron (ADI) can be considered a significant economic advantage to the increasing industrial demand for cost- and weight-efficient materials. However, due to its microstructure-induced inherent properties, ADI is considered hard-to-machine material. Thus, the dry drilling of ADI is investigated in this paper. The ADI material used in the present study is produced using an innovative process route for near net shape casting production. Drilling experiments are conducted on a DMU80P Deckel Maho five-axis machining centre using PVD-coated carbide tools under dry cutting environment. The dry drilling of ADI under different cutting conditions is evaluated in terms of specific cutting force and tool wear analysis. The influence of cutting conditions on chip morphology and surface roughness is also investigated. The experimental results revealed that the combination of the low feed rate and higher cutting speed leads to the higher mechanical and thermal loads on the tool's cutting edge, resulting in higher specific cutting force values. This behaviour is further supported by the chip morphology analysis, which revealed the formation of segmented chips at higher cutting speed with segment spacing increase with an increase in feed rate. Depending upon the cutting parameters, different modes of tool failures including crater wear, flank wear, chipping, breakage and built-up edge were observed. Surface roughness analysis revealed the influence of tool wear and chip morphology on the machined surface finish.     

深孔钻削中的孔轴线偏斜机理与控制方法

深孔钻削中的孔轴线偏斜问题是目前仍存在的一个技术难题,为控制孔轴线的偏斜,提高孔轴线的直线度精度,降低废品率,研究了深孔钻削中孔轴线偏斜的机理,研究表明合理选择切削方式和刀具几何参数,努力提高钻杆刚度、导向套精度和被加工工件的质量,都能有效地控制钻头在钻孔加工中的走偏,提高深孔零件的几何精度和加工质量.     

轻气炮身管深孔加工工艺研究

针对某轻气炮身管的零件结构和材料特性,分析难加工深孔零件的加工难点,确定合理的加工工艺。通过试验,优选刀具材料和切削参数。从工装设计方面,采用保护架和弹性厚壁套等措施解决难加工深孔零件的加工变形。根据孔轴线偏斜影响因素分析,提出通过附加外力控制孔轴线偏斜量的方法。结果表明:采用该工艺加工身管,内径尺寸精度和表面粗糙度均达到相应技术要求,孔轴线偏斜量为0.9mm/m,解决了难加工深孔零件的加工变形和孔轴线偏斜问题。     

An experimental investigation of the effect of coatings and cutting parameters on the dry drilling performance of aluminium alloys

As a result of the need to automate assembly in the aircraft industry, along with economic and ecological reasons, industry and research institutions have been pushed to develop dry drilling for aluminium alloys to eliminate the need for cooling fluids. The main difficulties in dry drilling are accelerated tool wear due to workpiece material adhesion on the tool and the formation of bigger-sized burrs. This paper describes an experimental research study on machinability in the dry drilling of aluminium alloys and on the potential of the new design of tools and coatings. Dry drilling tests were performed using uncoated drills and two different coatings produced by means of an arc evaporation PVD process. Experiments consisted of machining with a 10-mm diameter three-edged drill to produce 25-mm deep holes. Tool wear evolution and burr size were analysed, as well as the impact of the process parameters on torque, power, feed force and tool temperature.     

高速干切齿轮滚刀参数和滚齿工艺研究

目前,环境保护工作的要求日益严格,能源消耗有了具体的降低指标。在机械制造业干切削加工受到关注,其中齿轮的于切削滚齿已提上日程。国内有的齿轮加工厂已进口了干切滚齿机,有的齿轮机床厂已经开始试制干切滚齿机,已有2个以上的工具厂被要求配套供应能在滚齿速度200m／min以上工作的干切齿轮滚刀（以下简称于切滚刀）。