Planning robotic trajectories for thermal spray shape deposition

Fasching, M.; Prinz, Friedrich; Weiss, Lee E.

doi:10.1007/bf02647423

Cited by 35 publications

(2 citation statements)

References 8 publications

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“…The resulting shell is removed from the pattern, trimmed, and backed to produce an insert suitable for tooling (Ref [3][4][5][6][7][8][9][10][11][12]. Until recently, the manufacture of arc sprayed steel shells for production applications has been impossible because of excessive warping and distortion during spraying and subsequent cooling.…”

Section: Introductionmentioning

confidence: 99%

Arc Sprayed Steel: Microstructure in Severe Substrate Features

Newbery

Grant

2009

J Therm Spray Tech

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The effect of severe substrate topography on the microstructure of thermally sprayed coatings has been relatively neglected, but is critical in controlling the performance of thick electric arc sprayed steel shells for rapid tooling applications. This paper shows how the spray angle and the atomizing gas pressure control the distribution of porosity and oxide in steel sprayed in and around cylindrical holes of different diameter and depth. Droplet splashing and the secondary deposition of splash droplets caused systematic variations in microstructure. In particular, the origin of the phenomenon of ''bridging,'' the premature closure of features, has been revealed by microstructural analysis and explained in terms of the trajectories of droplets. The filling of features with higher-quality material can be aided by using a low atomizing gas pressure, reducing the oxygen partial pressure of the surrounding atmosphere and careful selection of the spray angle.

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Section: Introductionmentioning

confidence: 99%

Arc Sprayed Steel: Microstructure in Severe Substrate Features

Newbery

Grant

2009

J Therm Spray Tech

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“…Many different models have been presented in various papers for predicting the temperatures and velocities of the flame and in-flight particles. (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11) To simplify the calculation, it is a common practice to assume that the particles have the same size and trajectory and the interaction between flame and the particles can be neglected. (12)(13)(14) A difficulty with this simplification is that the variations in size, trajectory and interaction encountered in practical spraying are very substantial: the economics of powder manufacture inevitably produce a wide particle size range and the plasma jet is unavoidably heterogeneous in temperature and velocity.…”

Section: Introductionmentioning

confidence: 99%

Statistical Analysis of the Motion and Heating of Particles in a Plasma Jet

Zhang

Liu

Bao

et al. 2005

Plasma Chem Plasma Process

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In plasma spraying, the size and initial velocity of indivdual feedstock particles injected into the flame are essentially random variables within the fairly wide ranges of the injection conditions and powder characteristics. As a result, the motion and heating of particles cannot be specified in a deterministic manner and so a simulation based on a single particle cannot provide a realistic prediction of the deposition process. In the present study, these random elements are simulated using a statistical method. The distributions of the motion and heating of a whole population of particles are simulated rather than those of a single particle.

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