基于并行工程的产品模具开发过程重构研究

并行工程正在成为T公司在激烈的市场竞争中保持竞争优势的重要途径。以某产品压铸模具开发过程为例,首先研究了串行开发模式存在的问题,之后按照并行工程的基本思想,应用工业工程技术对开发过程进行了并行重构。最后,就该方案的效益进行了研究。     

日本成功开发纳米精度金属研磨技术

日本FDK公司与福岛大学合作，成功开发出精度达10mn以下的金属表面抛光技术，可对平面工件或凹凸型工件进行抛光处理，尤其适合用于光学零部件企业和模具企业。     

冷鲜肉专用包装PVDC共挤收缩袋在秦皇岛嘉瑞特公司研制成功并投入生产

秦皇岛嘉瑞特塑胶科技有限公司是一家专业从事肉制品包装材料研究和生产的中加合资企业。该公司成立于2004年2月，主要向国内外市场提供低温肉制品使用的包装材料：烟熏肠衣（Gplas Smoke）、多层共挤肠衣（Gplas Flex）、模具肠衣（Gplas Mould）。公司将主要精力投入到冷鲜肉包装材料的研究与开发方面。经过近10个月的努力，终于开发出用于冷鲜肉包装所用的PVDC共挤收缩袋产品，并推向市场。     

虚拟产品开发中的并行公差设计

并行公差设计能够有效解决VPD中的公差控制与公差分配问题，有利于VPD的全面集成以及面向加工和面向装配的实现。本文介绍了并行公差设计的内涵和特点，并提出了并行公差设计的系统结构。在此基础上开发的基于PDM的并行公差设计系统是虚拟开发平台的一个重要组成部分，已经通过863CIMS主题专家组的验收。     

基于PDM的夹具异地并行设计系统

以夹具设计过程为对象，以基于网络的产品数据管理软件IMAN作为夹具设计资源共享的先进手段，阐明了基于该软件而开发的夹具异地并行设计系统的原理和方法，实现了夹具开发信息的集成和设计过程的焦点，具体内容包括夹具设计系统任务描述和并行模块化分解，异地并行设计流程动态建模和实时交换设计信息工具的开发等原理和方法。     

模具生产过程的控制与质量管理研究

针对某集团公司模具生产过程中存在的生产周期长、费用高、质量不稳定等弊端，将生产计划与控制、质量管理等理论与方法，应用于模具制造的管理过程，在保证质量的前提下，缩短模具制造周期、降低成本、提高集团公司模具制造整体水平，进一步提高公司的经济效益。     

日立开发出一种新型涂层技术

日立工具公司最近开发出一种新型涂层技术，可充分利用硅的优异性能，这项技术是利用5nm大小的超细Si晶粒在切削工具上形成镀膜组织。采用新涂层技术处理的立铣刀等工具的使用寿命为原寿命的3倍，从而可大幅度提高模具加工的效率。日立工具公司今后将以Si类涂层取代钛、铝类涂层。从2001年底起，     

快速模具制造及其应用的重要性

模具是制约汽车开发与生产的瓶颈，新型快速模具不但能显著缩短制作周期、降低成本，还能提供制件的品质与生产效率。本文介绍了快速模具的类型、应用情况等。     

照相机械行业信息网网员单位简介(8)

浙江大学照相机研究室本研究室是我国最早、规模最大的照相机学科研究生、本科生培养基地，每年培养一批照相机专业的硕士与学士，是我国照相机械行业人才的主要摇篮。研究室为国内外照相机公司设计开发各类照相机及其模具配套、生产线指导等。拥有多项专利。专业为照相机...     

AutoForm R4 软件功能导航

<正>AutoForm软件为冲压模具制造和板料成形工艺提供了钣金件成形性分析的工具。通过使用AutoForm软件,不但可以提高工艺规划的可靠性、减少模具调试次数、缩短模具调试周期,以最大的可信度提高零件和模具设计质量,同时也可以降低由于零件质量缺陷导致模具返修带来的压机停机风险,提高生产效率。AutoForm R4是AutoForm公司基于R3开发的,它的界面结构与R3截然不同。此版本的界面     

Insertion of triangulated surfaces into a meccano tetrahedral discretization by means of mesh refinement and optimization procedures

In this paper, we present a new method for inserting several triangulated surfaces into an existing tetrahedral mesh generated by the meccano method. The result is a conformal mesh where each inserted surface is approximated by a set of faces of the final tetrahedral mesh. First, the tetrahedral mesh is refined around the inserted surfaces to capture their geometric features. Second, each immersed surface is approximated by a set of faces from the tetrahedral mesh. Third, following a novel approach, the nodes of the approximated surfaces are mapped to the corresponding immersed surface. Fourth, we untangle and smooth the mesh by optimizing a regularized shape distortion measure for tetrahedral elements in which we move all the nodes of the mesh, restricting the movement of the edge and surface nodes along the corresponding entity they belong to. The refining process allows approximating the immersed surface for any initial meccano tetrahedral mesh. Moreover, the proposed projection method avoids computational expensive geometric projections. Finally, the applied simultaneous untangling and smoothing process delivers a high‐quality mesh and ensures that the immersed surfaces are interpolated. Several examples are presented to assess the properties of the proposed method.     

Certification Institutions Expected to Update and Transfer Information on Present Standards

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……     

From Industry 4.0 to Research 4.0. Development of High Performance Fibers in the Light of Digitization

We associate a variety of innovations with the term ＂Industry 4.0＂. The pioneer of many 4.0 modifications forms the basisfor the trend towards the integrated di...     

Flow calorimeter for enthalpy increment measurements on condensed gases

A flow calorimeter for enthalpy increment measurements on condensed gases is presented. A better knowledge of the properties of the liquefied natural gas is needed, and therefore a liquid loop has been designed for our flow calorimeter. The fluid loop in the calorimeter is designed in order to avoid the two-phase region, since two phases would give compositional disturbances in the measurements. The avoidance of the two-phase region is made possible by increasing the pressure of the test fluid after the measurement section, then heating the fluid at super-critical pressure past the critical point. Finally, the fluid is throttled to the low-pressure gas state at the inlet condition of the compressor that circulates the fluid. To perform the pressure increase, a new cryogenic pump has been designed. To evaluate the new equipment, measurements were taken on liquid ethane over the temperature range 146–256 K at pressure between 0.9 and 5.1 MPa.     

Refrigerators Enter a New Era of Health Preservation Frestech initiates the establishment of China's first standard for household sterilization refrigerators

On November 30, 2007, the China Association for Standardization (CAS) held a press conference at Beijing Diaoyutai State Guest House. Leaders from the China Household Electric Appliance Research Institute, the China Household Electric Appliance Association, and the China Consumers' Association attended and made speeches.……     

Optimum-Simulation von Ernteprozessen

Zusammenfassung Bei der Gestaltung von Ernteprozessen — beispielsweise des Prozesses Mähdrusch, Körnertransport und -abnahme — als transportverbundene Fließarbeitsverfahren mit mindestens zwei verschiedenen Arbeitsmitteln gibt es einen großen Optimierungsspielraum. Solche Prozesse sind mehrstufige Bedienungsprozesse mit gemischter Anordnung der Bedienungseinrichtungen. Außerdem besitzen sie stark ausgeprägte räumliche Aspekte. Es wird vor allem gezeigt, welche Merkmale solcher Prozesse in Simulationsmodellen abgebildet sein müssen, welche Zielgrößen in Abhängigkeit von welchen Einflußgrößen unter Berücksichtigung welcher Prozeßbedingungen ermittelt werden sollten und wie der Bewertungsprozeß zur Ermittlung der gewünschten Informationen gestaltet werden muß.     

Roman iron and steel: A review

ABSTRACT

The production of ferrous metal increased during the Roman Late Republican period, Principate and Empire. The direct bloomery process was used to extract the metal from its ores using slag-tapping and slag-pit furnaces. The fuel was charcoal and an air blast was introduced by bellows-operated tuyères. Iron formed as a bloom, often as a spongy mass of metal, which contained impurities from the smelting process, including unreacted ore, fuel, slag and fragments from the furnace walls, while the metal was often inhomogeneous with varied carbon contents. Blooms were either smithed directly into bars or ingots or they were broken up, which also allowed the removal of gross impurities and a selection of pieces with similar properties to be made. These could then be forge-welded together and formed into characteristically shaped ingots. Making steel in the furnace seems to have been achieved: it depended on the ore and the furnace and conditions within it. Surface carburization was also carried out. Iron and steel were used extensively in construction and for tools and weapons. Fire welding was often used to add pieces of steel to make the edges of tools and weapons, which could be heat-treated by quenching to harden them.     

A study of centrifugal cast high boron high speed steel

In the present study a high‐boron high speed steel (HSS) roll material was designed. Many expensive alloy elements have been substituted by cheap boron alloy, and high‐boron high speed steel roll has been manufactured by centrifugal casting method. The microstructures, mechanical properties and wear resistance of centrifugal casting high‐boron high speed steel roll have been investigated by optical microscopy (OM), scanning electron microscopy (SEM), and X‐ray diffraction (XRD) analysis, hardness test, impact test and wear test. The results indicated that the solidification microstructures of high‐boron high speed steel roll consisted of M₂(B,C), (W,Mo)₂(B,C), M₃(B,C), M₂₃(B,C)₆ type borocarbides and martensite, a small amount of retained austenite. Borocarbides were continuously distributed over the grain boundary. After quenching from 1050 °C, local broken network appeared in partial borocarbides, and fine secondary borocarbide precipitated from the matrix. After tempering from 525 °C, the amount of precipitated borocarbide increased significantly. After heat treatment, the hardness of high‐boron high speed steel roll excelled 60 HRC, and its impact toughness excelled 8.0 J/cm². The single groove steel rolling amount of high‐boron high speed steel rolls increases by 500% than that of bainite cast iron roll, when the rolls are used in K₁ mill housing of bar mill.     

Thixotropy of Systems with Shear Thinning and Plastic Flow Behavior

The definition of the thixotropy is a decrease in viscosity with time in shear and a subsequent recovery of viscosity after the shear deformation is removed.We ...