What Is a Manufacturing Interaction?

1998 ◽  
Author(s):  
W. Faheem ◽  
C. C. Hayes ◽  
J. F. Castaño ◽  
D. M. Gaines
Keyword(s):  
Precedence Constraints ◽  
Cnc Machining ◽  
Manufacturing Operations ◽  
Feature Interactions ◽  
Interaction Types

Abstract In this work we make a distinction between feature interactions and manufacturing interactions. These two terms are usually used interchangeably because feature and manufacturing interactions often occur together, but not always. However, we feel that it is important to make a distinction between feature interactions which result from volumetric intersections of features presenting difficulties for features extractors, and manufacturing interactions which occur when two manufacturing operations interfere with each other’s execution, and present a problem to the process planner. By separating these definitions it allows us to focus separately on each phenomena. In this paper our focus is on manufacturing interactions. We present a non-exhaustive catalog of common manufacturing interaction types in CNC machining, and discuss how they result in precedence constraints in the manufacturing plan.

Hard Turning of AISI D2 Steel In CNC Machining: An Overview

2018 ◽  
Vol 3 (1) ◽  
pp. 17-20
Author(s):  
Navriti Gupta ◽  
◽  
A.K Agrawal, ◽  
R.S Walia ◽  
Ranganath Singari
Keyword(s):  
Metal Removal ◽  
Cnc Machining ◽  
Machining Process ◽  
Tungsten Carbides ◽  
Machining Processes ◽  
Manufacturing Operations ◽  
Aisi D2 ◽  
Removal Processes ◽  
Tough Steel ◽  
D2 Steel

D2 steel is an industrial tool steel. It is widely used in the tool and die industry for making cutting tool inserts, bending inserts, restriking inserts, etc. which can be taken out after their tool life. D2 steel is a very tough steel and difficult to machine also. High generations tool bits like Tungsten carbides and Titanium carbides are required to machine them. The heat treatment follows the machining process. Their machinability is very low. CNC machines are often used to finish them. Often they are machined using programs on UG-NX Uni Graphics(CAM) and DELCAM. And they have to be machined in three steps. Roughing operations, followed by Semi-Finish machining and the last step is finish machining.CNC machining centers are versatile in their applications in metal removal processes. Often they are so modernized that just like many manufacturing operations, metal removal can be automated too. The need for CNC machining arises due to extensive finishing requirements in the aerospace, automotive industries. However, the CNC or Computer and Numerically controlled machining process usage is not limited to these industries only. Tool and Die industry also is heavily dependent on CNC material removal and machining processes as now replaceable inserts are widely used in this industry.

A Comparison of Rapid Fabrication Methods for Sheet Metal Forming Dies

1999 ◽  
Vol 121 (2) ◽  
pp. 214-224 ◽  
Author(s):  
D. F. Walczyk ◽  
D. E. Hardt
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Lead Time ◽  
Low Cost ◽  
Cnc Machining ◽  
Die Geometry ◽  
Manufacturing Operations ◽  
Time Shape ◽  
Rapid Fabrication

The need for rapid, low-cost die fabrication and modification methods is greater than ever in the sheet metal forming sector of industry. Consequently, three fabrication methods, suitable for rapid die development schemes, are being compared experimentally based on cost, lead-time, shape resolution and flexibility issues. The candidate methods include CNC-machining a solid billet of material (standard method), assembling and clamping an array of profiled-edge laminations (PEL), and configuring and clamping a matrix of closely-packed pins (discrete die). A matched-set of forming dies was made using each of the candidate fabrication methods for stamping an FEA-verified benchmark part out of steel sheet. Based on the stamping experiments, a PEL die is shown to be similar to CNC-machined dies except that most tooling accessibility problems are eliminated, die geometry limitations are reduced and faster fabrication is possible for harder tool materials. When compared with CNC-machined dies, the discrete die method limits part shape fidelity, maximum forming loads, die geometry and blankholder incorporation. However, the discrete die method excels over the other two methods in terms of lower cost and faster fabrication time. The results of this study make a strong case for the sheet metal forming sector of industry to actively implement the PEL and discrete die methods in their manufacturing operations.

Coordinator: A Robust Setup Planner That Does Early Detection of Fixture-Feature Interactions

1998 ◽  
Author(s):  
W. Faheem ◽  
C. C. Hayes ◽  
D. M. Gaines ◽  
J. F. Castaño
Keyword(s):  
Early Detection ◽  
Manufacturing Operations ◽  
Feature Interactions ◽  
Manufacturing Information ◽  
Broad Variety ◽  
Set Up

Abstract This paper presents Coordinator, a process planner that uses a blend of geometric and manufacturing information to detect a broad variety of manufacturing interactions to sequence setups plans. This system is designed to be used by experts to reduce the time and effort required to produce good plans. Coordinator’s contributions is early detection of fixture-feature interactions (interferences between manufacturing operations in which one destroys clamping surfaces required by another). The ability to detect them early (i.e. prior to setup sequencing) eliminates the need for many re-planning cycles. These interactions are usually addressed only after set-up sequencing because sequencing determines part shape in each setup, which in turn affects clamping options. Coordinator addresses this problem through a representational which considers multiple possible workpiece shapes and clamping surfaces prior to setup sequencing. This representation enables Coordinator to consider fixture-feature interactions to sequence setups well in the first iteration, greatly reducing the need for iterative adjustment.

Modeling of Self-Induced Vibrations that Occur During the Machining Process of Casting Patterns with the Use of The Fuzzy-Neural Networks Method

2013 ◽  
Vol 58 (3) ◽  
pp. 871-875
Author(s):  
A. Herberg
Keyword(s):  
Neural Networks ◽  
Control System ◽  
Network Structure ◽  
Fuzzy Systems ◽  
Fuzzy Neural Networks ◽  
Cnc Machining ◽  
Machining Process ◽  
Modeling Process ◽  
Fuzzy Neural ◽  
Takagi Sugeno

Abstract This article outlines a methodology of modeling self-induced vibrations that occur in the course of machining of metal objects, i.e. when shaping casting patterns on CNC machining centers. The modeling process presented here is based on an algorithm that makes use of local model fuzzy-neural networks. The algorithm falls back on the advantages of fuzzy systems with Takagi-Sugeno-Kanga (TSK) consequences and neural networks with auxiliary modules that help optimize and shorten the time needed to identify the best possible network structure. The modeling of self-induced vibrations allows analyzing how the vibrations come into being. This in turn makes it possible to develop effective ways of eliminating these vibrations and, ultimately, designing a practical control system that would dispose of the vibrations altogether.

Review of Research on Hydrostatic Bearings

2020 ◽  
Vol 13 ◽  
Author(s):  
Xiaodong Yu ◽  
Yu Wang ◽  
Junfeng Wang ◽  
Wenkai Zhou ◽  
Hongwei Bi ◽  
...  
Keyword(s):  
High Speed ◽  
Static Pressure ◽  
Development Trend ◽  
Cnc Machining ◽  
Pressure Effects ◽  
Cnc Machine Tools ◽  
Future Research ◽  
Theoretical Formula ◽  
Hydrostatic Bearing ◽  
Hydrostatic Bearings

Background: Hydrostatic bearings have the advantages of strong bearing capacity, good stability, small friction coefficient and long life. The performance of liquid hydrostatic bearings directly affect the accuracy and efficiency of CNC machining equipment. The performance is conducive to the development of CNC machine tools towards high speed and heavy load, so it is necessary to sort out and summarize the existing research results. Objective: This study summarizes the current development status of hydrostatic bearings and explains the development trend of hydrostatic bearings. Methods: According to the recently published journal articles and patents, the recent experimental research on hydrostatic thrust bearings is summarized. This paper summarizes many factors that affect the performance of hydrostatic bearings, and discusses the causes of various factors on hydrostatic bearings. Finally, future research on hydrostatic bearings is presented. Results: The study discusses experimental methods, simulation processes, and experimental results. Conclusion: This study can produce dynamic and static pressure effects by changing the structure of the oil cavity of the hydrostatic bearing. This effect can make up for the static pressure loss. By improving the theoretical formula and mathematical model and proposing a new simulation method, the accuracy of the hydrostatic bearing simulation is satisfied; the future development trend of the hydrostatic bearing is proposed.

The Powers Metaphysic

2019 ◽  
Author(s):  
Neil E. Williams
Keyword(s):  
Potential Interaction ◽  
Status Quo ◽  
Repeated Application ◽  
Fundamental Ontology ◽  
The World ◽  
The Status ◽  
Foundational Ontology ◽  
Interaction Types

Systematic metaphysics is defined by its task of solving metaphysical problems through the repeated application of a single, fundamental ontology. The dominant contemporary metaphysic is that of neo-Humeanism, built on a static ontology typified by its rejection of basic causal and modal features. This book offers and develops a radically distinct metaphysic, one that turns the status quo on its head. Starting with a foundational ontology of inherently causal properties known as ‘powers’, a metaphysic is developed that appeals to powers in explanations of causation, persistence, laws, and modality. Powers are properties that have their causal natures internal to them: they are responsible for the effects in the world. A unique account of powers is developed that understands this internal nature in terms of a blueprint of potential interaction types. After the presentation of the powers ontology, it is put to work in offering solutions to broad metaphysical puzzles, some of which take on different forms in light of the new tools that are available. The defence of the ontology comes from the virtues of metaphysic it can be used to develop. Particular attention is paid to the problems of causation and persistence, simultaneously solving them as it casts them in a new light. The resultant powers metaphysic is offered as a systematic alternative to neo-Humeanism.

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