Showing papers in "CIRP Annals in 1988"

TL;DR: In this paper, it was shown that the removal mechanisms for machining conductive ceramics differ from those involved in metal machining, and that the grain structure evinced by the ceramic must be as fine and homogeneous as possible.

TL;DR: In this article, the authors describe conventional and enhanced methods for the monitoring and control of machining processes with a limitation to cutting and grinding machine tools, and the differences between the various methods and the corresponding equipment, software and strategies are considered.

TL;DR: The profile of machined surface of hardened steel reflects the profile of cutting edge as discussed by the authors, which is the result of high shear angle and the sawtoothed chip formation due to the poor ductility of hard materials.

TL;DR: In this paper, a fundamental study on machinability of glassfiber reinforced plastics, chip formation, cutting force and surface quality are evaluated in orthogonal cutting with varied fiber angles.

TL;DR: In this paper, the authors examine the current status of, and suggest some future directions for, research efforts in an area important for computer-integrated manufacturing: computer-aided process planning (CAPP).

TL;DR: In this article, a general and unique identification model based on the small-displacement screw is shown to be usefull for any surface and any criterion, dealing with planes, circles and cylinders, and established a comparaison between the different optimalizing criteria.

TL;DR: Experiments show that the volumetric errors of a three-axis machine tool or measuring machine can be determined by measuring the displacement error along 22 lines in the machine work zone, which simplifies machine calibration, reduces the equipment needed, and can improve accuracy.

TL;DR: In this paper, the effect of work-material properties on the cutting force, cutting surface, etc. must be taken account in relation with its micro size of produced chips, and it is shown that the cutting mechanism became quite different either for polycrystal, single crystal and amorphous materials and for brittleness and ductileness.

TL;DR: In this article, the authors developed an improved thermal model which would accurately predict the position of the burn boundary by partitioning the heat flux between the grinding wheel and the workpiece, which allows more realistic values of heat flux to he employed in the model.

TL;DR: In this article, a computer-aided planning system for the selection of set-ups and the design of fixtures in part manufacturing is presented. But the planning procedure of FIXES consists of two parts: selection of sets and fixtures for each set-up.

TL;DR: In this article, the performance of six commercially available chip forming tool inserts has been assessed and the tool restricted contact effect determining the chip streaming (i.e. chip backflow) has been found to be a major influencing factor in chip breaking.

TL;DR: In this paper, a feed-forward control scheme based on real-time computer simulation of the thermal deformation process was proposed to compensate for the unsteady-state thermal displacement of a spindle during rotation.

TL;DR: In this paper, the authors deal with geometrical analysis and software development for the designing of cutter and grinding wheel profiles, and present two methods, the direct and the indirect, for the prediction of the helical flute profiles and cutter profiles respectively.

TL;DR: In this paper, the authors present an assembly-oriented design process as a new developed procedure for rationalization of assembly costs in a product, and present a short description of well-known methods of design for assembly.

TL;DR: In this paper, the influence of convective heat transfer on the machine tool headstock has been investigated and two design and two compensatory methods investigated, which may be classified under the headings of design and compensation.

TL;DR: This paper compares these methods with that of the stylus technique and shows that the way in which they are developing seems to be complementary rather than competitive.

TL;DR: A surface texture and profile-measuring stylus instrument, developed at NPL and called NANOSURF 2, which has a continuous dynamic horizontal range of 50 nm to 50 mm, is being used for sub-nanometre surface texture measurement on a wide range of engineering, optical and semi-conductor surfaces as mentioned in this paper.

TL;DR: In this paper, the surface integrity of high-strength steel plates, namely dual phase, micro-alloyed and high alloyed chromium steels, is investigated.

TL;DR: In this paper, a new version of electrodischarge machining is developed possessing a number of advantages, such as high material removal rate and low electrode wear, which is recommended for machining of dies and other jobs with complicated cavities.

TL;DR: The paper proposes an all-round solution to a number of problems, related to the wire-EDM process, based on the development of a Knowledge-based system that enables process monitoring and control, making use of a reliable rupture probability parameter.

TL;DR: In this article, the amplitude of high frequency vibrations generated during normal metal cutting operations is influenced by a wide variety of process conditions, including chip formation, runout, and variations in speed and depth of cut, can generate signals which are similar to those arising from a tool break.

TL;DR: In this paper, a geometrical simulation of electric discharge machining for die sinking processes is presented, showing how tool wear and workpiece geometry progress during the machining process.

TL;DR: In this paper, a graphite epoxy composite boring bar was constructed and tested for machining S45C tapered steel bar workpieces, which allowed for 5 times larger depth of cut compared to that of the steel boring bar, before the onset of chatter.

TL;DR: In this article, the authors identify the remaining problems in tolerancing, their relations with functions and suggest approach directions for their future practical solutions, as well as suggest approach direction to solve them.

TL;DR: In this article, a further developed version of the cutting force evaluation method is introduced. But this method is based on the same approach presented last year, and it does not take into account the dynamic effects (splndle rotation speed and the dynamometer natural frequency).

TL;DR: In this paper, a knowledge-based system approach is proposed to generate technologically feasible preforming sequences for multi-stage cold forging of solid and hollow rotationally symmetric parts, which are intended to be initial designs which need additional analyses and evaluations in order to identify the most appropriate forging sequence.

TL;DR: In this paper, the verification of the CNC-coordinate measuring machines (CMMs) accuracy is one of the most important tasks of the Physikalisch-Technische Bundesanstalt (PTB).

TL;DR: The Design Axioms have been introduced to establish the general scientific basis for making design decisions in evaluating the requirements and the consequent theorems and corollaries provide specific criteria for “design for producibility.”

TL;DR: In this paper, an improved thermocouple method for measuring the contact length between the wheel and the workpiece is described. But the method is not repeatable and the relationship between contact length and workpiece speed and cutting depth has not been examined.

TL;DR: In this paper, the Bauschinger effect in steel and aluminum sheet was determined as a function of strain amplitude, prestrain, and sheet thickness in a series of bending and reverse bending steps.