气门顶杆热挤压模具寿命研究

叙述了气门顶杆热挤压模失效形式。通过几种热加工模具材料的对比试验 ,并借助扫描电镜、显微镜观察 ,分析了气门顶杆热挤压模的微观组织 ,指出影响模具寿命的因素 ,从而为提高热挤压模具寿命提供了理论依据。     

气门项杆热挤压模具寿命研究

叙述了气门顶杆热挤压模失效形式。通过几种热加工模具材料的对比试验，并借助扫描电镜、显微镜观察，分析了气门顶杆热挤压模的微观组织，指出影响模具寿命的因素，从而为提高热挤压模具寿命提供了理论依据。     

成形速度对转向节热挤压系统的影响

针对转向节热挤压模具寿命普遍低下的问题,采用有限元数值模拟方法研究了不同成形速度对热挤压系统力、热两方面的影响规律。结果表明:在转向节热挤压过程中,最大挤压力、凹模应力集中区最大主应力、挤压锻件最高温度、模具表层最高温度均随成形速度的增加而增大。这对如何减缓模具失效、提高模具寿命提供了理论参考。     

提高热挤压模具寿命的途径

提高热挤压模具寿命的途径８１０７００乐都青海锻造厂赵洲城徐尚平杨柳如何提高模具寿命，一直是广大锻造工作者十分关切的一个问题。模具寿命与诸多因素有关，本文仅对我厂热挤压件生产中模具寿命低所采取的改进措施作以介绍，以便与同行们进行交流和探讨。我厂生产的热...     

H13热挤压凸模失效形式及提高寿命途径

分析了热挤压凸模的失效形式及其原因,从模坯锻造、机械加工、热处理和模具使用等方面叙述了提高H13钢热挤压模具寿命的工艺措施及要求。     

H13热挤压凸模失效形式及提高寿命途径

分析了热挤压凸模的失效形式及其原因，从模坯锻造、机械加工、热处理和模具使用等方面叙述了提高H13钢热挤压模具寿命的工艺措施及要求。     

球形支承复合热挤压成形

介绍越野车球形支承的热挤压复合成形工艺及其模具结构,并对模具进行技术经济分析,提出了提高模具寿命的有效措施。     

提高3Cr2 W8 V钢热挤压模寿命的工艺措施

从模坯锻造及预处理、热处理、机加工、电加工、表面强化和模具使用等方面 ,叙述了提高3Cr2W8V钢热挤压模寿命的工艺措施及要求。生产实践证明 ,充分发挥工艺设计的潜力 ,可以大幅度提高模具寿命     

改进热挤压模具寿命的措施

针对热挤压模具失效的原因， 提出了改进挤压模具寿命的措施     

提高3Cr2W8V钢热挤压模寿命的工艺措施

从模坯锻造及预处理、热处理、机加工、电加工、表面强化和模具使用等方面,叙述了提高３Ｃｒ２Ｗ８Ｖ钢热挤压模寿命的工艺措施,生产实践证明,充分发挥工艺的潜力,可以大幅度提高模具寿命。     

温挤压模具寿命影响因素分析及改进措施

系统分析了温挤压模具服役条件和影响模具寿命的各种因素,从模具设计、选材、润滑、表面强化处理等方面,阐述了提高温挤压模具寿命的措施.     

喷焊镍基材料切削加工过程的研究

通过选用一批有代表性的典型刀具对喷焊镍基高温合金材料进行刀 具耐用度切削对比试验,找出了各自的耐用度公式,并且还借助于扫描电镜和电子探针观察刀具磨损区,切屑底面和工件已加工表面,由微区形貌和微区成份分析得出其刀具主要为磨粒磨损的结论,这与通常高温镍基合金材料切削时的刀具磨损规律不同。     

Optimization of cutting parameters for maximizing tool life

Optimum use of the cutting tool is a growing need in modern industries since the cost of production is directly affected by this. This paper presents a new approach for improving the cutting tool life by using optimal values of velocity and feed throughout the cutting process. A tool life equation has been established from experimental data and the adhesion wear model. Optimization techniques have been used to maximize the tool life subject to practical constraints while maintaining a constant metal removal rate. The experimental results showed an improvement in tool life by 30%.     

Tool life increase of coated carbide tools by micro blasting

In today’s production engineering nearly every cutting tool is coated. Since using the technology of coating different process chains for reconditioning have been developed. The last innovation is micro blasted coatings, which is the main topic of this paper. Concerning this topic influences on tool life have been investigated. Investigations on the tool life especially of hobbing tools were made thereby and coherences between coating bond, roughness and other attributes were discovered. The investigations were made with an aluminum oxide and a zirconium oxide as blasting abrasives and a variation of the blasting parameters pressure and period. The final result is an optimization of tool wear behavior by micro blasting of the coating.     

精切活塞环槽侧向微进给系统设计

提出了一种精切活塞环槽时刀具侧向微进给方案:在切槽刀具切到槽底后,再作一个微量的侧向进给运动,对环槽的一侧进行微量切削,使加工后的环槽宽度恢复到理想尺寸,达到延长刀具寿命的目的。文中对该方案进行了研究、设计,给出了侧向微位移刀架总体结构设计以及配套的刀具设计方案,并对弹性铰链,刀具结构等关键问题给了出设计公式或设计参数。     

A novel approach to quantifying tool wear and tool life measurements for optimal tool management

It is a common practice in batch production to continually use the same tool to machine different parts, using disparate machining parameters. In such an environment, the optimal points at which tools have to be changed, while achieving minimum production cost and maximum production rate within the surface roughness specifications, have not been adequately studied. The tool wear index (TWI) and the tool life model developed in this study use a novel approach, analyzing wear surface areas and material loss from the tool using micro-optics and image processing/analysis algorithms. With relation to surface roughness, the TWI measures the wear conditions more accurately and comprehensively, and the tool life model enables maximum use of a worn tool and minimum risk for in-process tool failure. The TWI and a surface roughness control model are integrated into an optimal control strategy that shows potential for productivity improvement and reduction of manufacturing cost.     

A comparison of cryogenic and high pressure emulsion cooling technologies on tool life and chip morphology in Ti-6Al-4V cutting

The promise of extended tool life or shorter production times with the application of cryogenic coolants and high pressure emulsions during metal machining is encouraging for the widespread commercial adoption of such technologies. Many researchers have previously investigated these coolant technologies in machining and all have reported various benefits. However, until now no direct comparison of each technology has been made using consistent tooling, coolant nozzle position and cutting parameters in titanium turning. This makes industrial adoption difficult because it is still unknown which technology offers superior tool life. This work investigates the tool life and chip morphology during Ti-6Al-4V turning using each coolant with constant cutting parameters and coolant nozzle position. It is found that high pressure water based emulsion offers slightly better tool life than that achievable with cryogenic coolant, however, the most influential parameter is the coolant nozzle position. Several changes to chip morphology were observed with each coolant and these are discussed in-depth.     

某输送机刮板模锻成形工艺数值模拟研究

以某输送机刮板为研究对象,建立有限元模型,分析该锻件成形过程中的零件温度场、模具温度场以及成形载荷等因素的影响,并应用Archard磨损模型分析了模具复杂多因素耦合情况下的磨损情况,预测了单次磨损的深度分布,并得出单次磨损最大深度0.00510mm,为优化模具设计、提高模具寿命提供了理论依据。     

The optimal cutting conditions as a function of probability distribution function of tool life and experimental test numbers

The aim of this paper is to evaluate how an a priori assumed tool life probability distribution function (pdf) can influence the optimal cutting conditions if the known data are continually updated using new tool life values. With this target some tool failures have been carried out through which it has been possible to draw conclusions on how many experimental failures may be necessary to obtain reliable optimal cutting conditions. In our case these data have been taken from Sekulic (1982, Int. J. Prod. Res. 20, 187; 1978, Int. J. Prod. Res. 16, 51). We suggest however that a factorymight use only few experimental data, refining them using new values derived directly from the production line. Long-normal and Weibull pdfs are used for some example as a priori known functions even if the overall set of experimental numbers does not fit the chosen pdf. It is in fact supposed at first in this paper that the whole set of data is known. Obviously the results are not independent of the chosen pdf, expecially when only the first few tool life values are taken into account. The new method proposed instead compares the results obtained from n^th and (n+1)^th sets of values, progressively refining the optimal conditions as far as all experimental tool life data are concerned; as mentioned above.     

High-speed milling of titanium alloys using binderless CBN tools

The performance of conventional tools is poor when used to machine titanium alloys. In this paper, a new tool material, which is binderless cubic boron nitride (BCBN), is used for high-speed milling of a widely used titanium alloy Ti–6Al–4V. The performance and the wear mechanism of the BCBN tool have been investigated when slot milling the titanium alloy in terms of cutting forces, tool life and wear mechanism. This type of tool manifests longer tool life at high cutting speeds. Observations based on the SEM and EDX suggest that adhesion of workpiece and attrition are the main wear mechanisms of the BCBN tool when used in high-speed milling of Ti–6Al–4V.