Interface laws for impregnated diamond tools for a given state of wear

Franca, Luiz; Mostofi, Masood; Richard, Thomas

doi:10.1016/j.ijrmms.2014.09.010

Cited by 43 publications

(14 citation statements)

References 22 publications

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“…Since in the core drilling process many different factors influence the strength of the arising forces [4], experiments with only one diamond are conducted. The so called single grain scratch tests keep the number of influencing factors small due to the absence of diamond break outs, interactions between diamonds and the influence of the metal matrix surrounding the diamonds in a segment.…”

Section: Methodsmentioning

confidence: 99%

Model based optimization of a statistical simulation model for single diamond grinding

et al. 2016

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We present a model for simulating normal forces arising during a grinding process in cement for single diamond grinding. Assuming the diamond to have the shape of a pyramid, a very fast calculation of force and removed volume can be achieved. The basic approach is the simulation of the scratch track. Its triangle profile is determined by the shape of the diamond. The approximation of the scratch track is realized by stringing together polyhedra. Their sizes depend on both the actual cutting depth and an error implicitly describing the material brittleness. Each scratch track part can be subdivided into three three-dimensional simplices for a straightforward calculation of the removed volume. Since the scratched mineral subsoil is generally inhomogeneous, the forces at different positions of the workpiece are expected to vary. This heterogeneous nature is considered by sampling from a Gaussian random field.To achieve a realistic outcome the model parameters are adjusted applying model based optimization methods. A noisy Kriging model is chosen as surrogate to approximate the deviation between modelled and observed forces. This deviation is minimized and the results of the modelled forces and the actual forces from conducted experiments are rather similar.

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Section: Methodsmentioning

confidence: 99%

Model based optimization of a statistical simulation model for single diamond grinding

et al. 2016

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“…In reference of the related technical literature (the operational mechanics of the rock bit, etc. ), [16][17][18][19] as illustrated in Figure 5, taking point O as the intersection point of the two axes (since the main part of the bit body is spherical, point O is also the center of the sphere in the axis plane), and point O 1 as the journal root center, the arm of the journal root center C, which is one of the most important parameters for settling the geometric position of the bit body, should be represented as…”

Section: Relation Equation Of Geometric Parameters Of the Bitmentioning

confidence: 99%

Research on working principle and cross-track cutting characteristic of the axis-tilted rock-breaking tool

Ren

Yang

Zhou

et al. 2019

Advances in Mechanical Engineering

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Concentric-track cutting method of a conventional polycrystalline diamond compact bit makes the bit suffer from inadequate rock-penetrating capacity and severely hinders the improvement of rock-breaking efficiency. Nevertheless, crosstrack cutting method is already proved to be an effective way to improve the penetrating ability of the bit. Accordingly, a novel rock-breaking tool with tilted rotating axis is put forward in this article. In this research, first, the structural characteristics of the rock-breaking tool with tilted rotating axis are introduced in detail, relation equations of key geometric parameters of the bit are established, and coordinates of the feature points of the cutters are represented. Second, tracks and motion tendency of the cutters in different areas, as well as the bottom-hole coverage pattern, are respectively analyzed, and the influences of different factors on cutter motion are compared. Third, corresponding indoor experiment is conducted to research the influences of revolution/rotation ratio and axis-tilt angle on drilling efficiency, and the rock particles are compared to reveal the rock-breaking mechanism of the tool. This research is intended to provide basic theoretical support for the engineering application of the tool and is of certain referential significance to improving the rock-breaking efficiency in formations of poor drillability.

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“…al. [5] examined the topology and scale of segment wear generated by drilling granite products, like crown drills with diamond bit. During the tests, the grains and binder wear rates were examined and different cases of wear and tear of diamond grains observed.…”

Section: Literature Reviewmentioning

confidence: 99%

Examination of Feedrate Impacts on Different Grain Size Granite Materials from Edge Damage Aspect

Gábor¹

2018

World Congress on Mechanical, Chemical, and Material Engineering

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Different natural stones as granite, marble and limestone are used in the construction industry and in the last few years, they are also used with a growing amount in manufacturing technology. It can be seen that a minimal damage can be observed on the edge of products of the mentioned industrial segments due to cutting., The primary goal of the presented paper is to examine the changes of the chipping at the edges of damaged granite samples The damage is resulted in cutting with different feedrate speed. The article tries to give recommendations to remedy the explored problems. During the research, there were 3 different granite boards with average particle size. 8 different sample surfaces were produced by 8 feed rates of each. Sample surfaces were made by an NC cutting centre which was especially created for chipping stones. On the sample surfaces, the size of the edge chipping at the output side of the tool was examined. The digitization and evaluation processes were implemented with a DinoLite microscope and its associated software. The examination confirms that the increase in feedrate reduces the average edge chipping rate The increase of federate ends up in a local minimum, whereafter strong loss of edge damage can be observed. The experiments manifest that the feedrate related to the best edge quality is independent from the grain size in all types of stone. It should be noted that in the case of using granite, the same change in can be observed when adjusting feedrate and the same approximation curve can be used for statistical evaluation.

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Interface laws for impregnated diamond tools for a given state of wear

Cited by 43 publications

References 22 publications

Model based optimization of a statistical simulation model for single diamond grinding

Model based optimization of a statistical simulation model for single diamond grinding

Research on working principle and cross-track cutting characteristic of the axis-tilted rock-breaking tool

Examination of Feedrate Impacts on Different Grain Size Granite Materials from Edge Damage Aspect

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