Showing papers on "Honing published in 2014"
03 Feb 2014
TL;DR: In this article, surface texturing by means of laser processing or mechanical indentation at the dead centres is used to produce local reservoirs of lubricant as well as to encourage and direct the flow of the lubricant into the contact conjunction.
Abstract: Friction constitutes nearly one fifth of all engine losses. The main contributory source of frictional losses in most engines is the piston–cylinder system, accounting for nearly half of all the parasitic losses. Minimisation of this is essential for improved fuel efficiency and reduced emissions, which are the main driving forces in engine development. The tribology of piston–cylinder conjunctions is, however, transient in nature. This means that various palliative actions need to be undertaken to suit certain instances during the engine cycle. In general, formation of a coherent film of lubricant of suitable viscosity reduces the chance of boundary interactions for most of the piston cycle. Plateau honing of the cylinder bore surface reduces the ‘peakiness’ of the surface topography. Furthermore, if regularly spaced grooves are provided on the contacting surface, these grooves can act as reservoirs of lubricant. However, at low sliding speeds, which are typically found during piston motion reversals, lubricant entrainment into the contact either ceases or is significantly reduced. Therefore, at the end of the piston strokes, there is a greater chance of boundary interactions, resulting in increased friction. There is a need to engineer the surface topography in these low-relative-speed regions in a manner conducive to the retention of a lubricant film. Surface texturing by means of laser processing or mechanical indentation at the dead centres are used to produce local reservoirs of lubricant as well as to encourage and direct the flow of lubricant into the contact conjunction. The paper shows that such surface-modifying features improve the engine’s output power by as much as 4% over that of the standard cylinder bore surface. To reduce wear and scuffing, particularly at the top dead centre, hard coatings can also be used. However, smooth surfaces and the generally oleophobic nature of hard coatings can increase the chance of adhesion, particularly at low sliding speeds. This means that prevention of wear does not necessarily lead to improved fuel efficiency. Furthermore, it is necessary to determine the geometry of the textured patterns in order to avoid the leakage of oil from the ring-pack conjunctions, which can result in increased emissions as well as lubricant degradation and depletion.
54 citations
01 Jan 2014-Precision Engineering-journal of The International Societies for Precision Engineering and Nanotechnology
TL;DR: In this article, the influence of different parameters of the rough honing process on surface roughness and material removal rate were studied by means of regression analysis, and the results showed that roughness depends mainly on grain size, pressure and density of abrasive.
Abstract: In the present work influence of different parameters of the rough honing process on surface roughness and material removal rate were studied. Specifically, second order mathematical models are presented for mean average roughness Ra (μm), maximum peak-to-valley roughness Rt (μm) and material removal rate Qm (cm min −1 ), obtained by means of regression analysis. For doing this a central composite design was defined, with a full two-level five variables design of experiments, 5 centre points and 10 face-centred points. Steel cylinders were employed. Abrasive chosen was cubic boron nitride. Considered factors were grain size, density of abrasive, tangential speed of cylinders, linear speed of honing head and pressure of abrasive stones on internal surface of cylinders. From the models most influential factors on process quality as well as on productivity were determined. Within the range studied, roughness depends mainly on grain size, pressure and density of abrasive. Material removal rate depends on grain size and pressure, followed by tangential speed. Optimization by means of the desirability function technique allowed determining most appropriate conditions to minimize roughness (surface quality) and/or maximize material removal rate (productivity).
45 citations
TL;DR: In this paper, the authors describe mathematical modeling of material removal rate and surface roughness of the bevel gears finished by the electrochemical honing (ECH) process and propose a method for computing the surface area, required by these two models, along the inter-electrode gap (IEG) based on the geometry of the straight bevel gear tooth surfaces.
43 citations
TL;DR: In this article, the alloy of 75% Cu-25% Sn was used and hot-pressed for 4min at 421, 520 and 600°C to obtain a self-sharpening bond for diamond honing stones at low sintering temperature.
27 citations
TL;DR: In this paper, a new approach aims at the shortening of the running-in phase by adjusting the surface topography of a milling, grinding, and honing process, and specific topographies resulting from milling and grinding processes were generated and tested under lubricated sliding wear conditions.
22 citations
01 Oct 2014-Precision Engineering-journal of The International Societies for Precision Engineering and Nanotechnology
TL;DR: In this article, a particle swarm optimization technique was used to improve the finish of the gears' tooth flank, and the results showed that profile error was minimized and the quality was improved based on a set of strategies that were held simultaneously in the input parameters.
Abstract: Gears are among the most important mechanical components of the modern industry. The topography of the gears’ tooth flank has an intricate and complex form and requires great finishing and quality. Commonly, traditional grinding processes are applied to finishing gear profile. However, the use of honing process has grown in recent years to provide the best finishing in industrial products. In this study, the honing process was improved applying a particle swarm optimization. Pinions of steering systems were used as work pieces to testify the optimization technique. The input parameters were the spindle speed, feed rate in X direction, feed rate in Z direction, oscillation time, and spark out time. The experimental measures were compared with simulation tests using the responses total profile deviation (f α ), total helix deviation (f β ), and total cumulative pitch deviation (f p ). The results showed that profile error was minimized, and the quality was improved based a set of strategies that were held simultaneously in the input parameters.
22 citations
TL;DR: In this paper, the distortion of surface topography measurement results by improper selection of the reference plane is taken into consideration, and a special procedure is proposed in order to select the degree of a polynomial.
Abstract: In this paper distortion of surface topography measurement results by improper selection of the reference plane is taken into consideration. The following types of surfaces from cylindrical elements were analyzed: cylinder liners after plateau honing, cylinder liners with additionally burnished oil pockets and turned piston skirts. Surface topographies of these elements after a low wear process were also studied. In order to obtain areal surface topography parameters, the form was eliminated using cylinders and polynomials of the following degrees: 2, 3, 4, 6, 8, 10 and 12. Parameters of surfaces after form removal were compared. After analysis of results the reference elements for each kind of surface were recommended. A special procedure was proposed in order to select the degree of a polynomial. This method is based on surface topography changes with increase of polynomial degree. The effect of improper form elimination on measuring uncertainty was studied.
21 citations
Patent•
10 Mar 2014
TL;DR: In this article, an annular tool with at least one annular cutting group having a plurality of radially infeedable cutting material bodies which are distributed around the circumference of a tool body and are designed as honing segments which are wide in the circumferential direction and narrow in the axial direction is used for machining the internal surface of a bore in a workpiece.
Abstract: In a honing method for machining the internal surface of a bore in a workpiece with the aid of at least one honing operation, during a honing operation, an expandable honing tool is moved up and down within the bore in order to produce a reciprocating movement in the axial direction of the bore and at the same time is rotated in order to produce a rotational movement combined with the reciprocating movement. In the process, a bottle-shaped bore is produced, said bore having, following a bore inlet, a first bore section with a first diameter, a second bore section with a second diameter, which is larger than the first diameter, away from the bore inlet, and a transition section with a continuous transition from the first to the second diameter between the first and the second bore section. During at least one honing operation, use is made here of an annular tool ( 200 ) which has at least one annular cutting group ( 220 ) having a plurality of radially infeedable cutting material bodies which are distributed around the circumference of a tool body and are designed as honing segments which are wide in the circumferential direction and are narrow in the axial direction, wherein an axial length of the honing segments, as measured in the axial direction, is smaller than the width measured in the circumferential direction, and the axial length of the cutting region equipped with cutting material bodies is smaller than the effective outside diameter of the honing tool. The method is particularly suitable for honing cylinder faces during the production of cylinder blocks or cylinder liners for reciprocating piston engines.
18 citations
TL;DR: In this paper, the use of pulsed-electrochemical honing (PECH) process to improve the micro-geometry of the straight bevel gears was reported, and experimental optimization of three important parameters of PECH namely pulse-on time, pulse-off time, and finishing time were presented.
Abstract: Accuracy in micro-geometry is an important issue for gears because it affects noise generation and transmission characteristics and consequently determines the operating performance and service life of the gears. Various post-manufacturing processes are required to achieve the desired level of accuracy in micro-geometry of the gears. This paper reports on use of pulsed-electrochemical honing (PECH) process to improve micro-geometry of the straight bevel gears and presents experimental optimization of three important parameters of PECH namely pulse-on time, pulse-off time, and finishing time. Seventeen experiments were conducted according to central composite rotatable approach of response surface methodology. The improvements in micro-geometry of bevel gears in terms of average percentage improvement in single pitch error, adjacent pitch error, cumulative pitch error, and in total runout were found as 34.22%, 39.58%, 13.34%, and 18.88%, respectively. These improvements are better than those achieved using...
18 citations
TL;DR: The present results demonstrate that the honed cylinder geometry improves the friction results increasing the oil film thickness and proposes the operational function between the textured rings with the modified cylinder liners in marine engines.
14 citations
TL;DR: In this article, a comparison of ring-pack friction for cylinder texture with different cross-hatch angles and valley sizes is presented, taking into account the mutual effect of valley depth and honing angle.
Abstract: The cylinder liner surface texture, widely generated by the honing technique, contributes a lot on engine functional performances (friction, oil consumption, running-in, wear etc.). In order to improve these functional performances, different honing processes are being developed. These different honing processes generate surfaces with various texture features characteristics (roughness, valleys depth, valley width, cross hatch angle, etc.). This paper addresses a comparison of ring-pack friction for cylinder texture with different cross-hatch angles and valley sizes. It takes in consideration the mutual effect of valley depth and honing angle. A numerical model is developed to predict friction within the cylinder ring-pack system in mixed lubrication regime and a morphological method is used to characterize groove depth. The results show the effect of different honing variables (rotation speed, stroke speed and indentation pressure) on cylinder bore surface textures and hydrodynamic friction of the ring-pack system.
TL;DR: The NANOSLIDE lever of the NANOLLIDE® from Mercedes-Benz as mentioned in this paper enables the measuring and adjusting of the part and the central plunging of the coating torch into the bore to achieve a homogeneous coating thickness.
Abstract: After 125 years of development in combustion engines, the attractiveness of these powerplants still gains a great deal of attention. The efficiency of engines has been increased continuously through numerous innovations during the last years. Especially in the field of motor engineering, consequent friction optimization leads to cost-effective fuel consumption advantages and a CO2 reduction. This is the motivation and adjusting lever of NANOSLIDE® from Mercedes-Benz. The twin wire arc-spraying process of the aluminum bore creates a thin, iron-carbon-alloyed coating which is surface-finished through honing. Due to the continuous development in engines, the coating strategies must be adapted in parallel to achieve a quality-conformed coating result. The most important factors to this end are the controlled indemnification of a minimal coating thickness and a homogeneous coating deposition of the complete bore. A specific system enables the measuring and adjusting of the part and the central plunging of the coating torch into the bore to achieve a homogeneous coating thickness. Before and after measurement of the bore diameter enables conclusions about the coating thickness. A software tool specifically developed for coating deposition can transfer this information to a model that predicts the coating deposition as a function of the coating strategy.
08 Apr 2014
TL;DR: In this paper, the effect of surface topography parameters on the cylinder liners of a gray cast iron cylinder was studied, and it was found that the Sq group were sensitive to parameter change, while the other parameters, Spq and Svq, were stable.
Abstract: Many truck cylinder liners made from gray cast iron were machined. Ceramic and diamond honing stones were used in the last stages of operation: coarse honing and plateau honing. The effect of honing parameters on the cylinder liner surface topography was studied. Selected surface topography parameters were response variables. It was found that parameters from the Sq group were sensitive to honing parameter change. When plateau honing time varied, the Smq parameter increased, while the other parameters, Spq and Svq, were stable.
TL;DR: In this article, a new approach using a pulse YAG laser with rational power density and pulse width to texture desired discrete distribution morphology on the cylinder wall was developed, which reduced the coefficient of friction and wear rate of laser texturing cylinders.
Abstract: Purpose - The purpose of this study was to develop a new approach using a pulse YAG laser with rational power density and pulse width to texture desired discrete distribution morphology on the cylinder wall. Design/methodology/approach - Variational rules of the effects of these three parameters were found by calculating the oil film on the cylinder/piston ring system. The experiment results were compared between laser texturing cylinders and conventional honing cylinders. Findings - It was found that the coefficient of friction and wear rate of laser texturing cylinders were reduced by 50 and 85.7 per cent, respectively, and the piston ring wear rate was decreased by 50 per cent under full lubrication condition. Under starved lubrication condition, the cylinder liner wear was reduced by 34.3 per cent. Originality/value - The effectiveness of which was determined by three control parameters: depth-to-diameter ratio, area density and distribution angle of the dimples.
TL;DR: In this paper, the static and dynamic correlation of the process forces in order to give a basis for a new regulation approach especially for bores with smaller diameters (below 20mm) where the direct measurement of process forces with a tool- integrated sensor is difficult.
Patent•
13 Aug 2014
TL;DR: In this paper, a high-performance environment-friendly water-based honing working fluid is described, which is composed of an organic acid, an organic amine, a synthetic lubricant, a novel surface active agent, a corrosion inhibitor, water and a defoaming agent.
Abstract: The invention discloses a high-performance environment-friendly water-based honing working fluid The high-performance environment-friendly water-based honing working fluid is composed of an organic acid, an organic amine, a synthetic lubricant, a novel surface active agent, a corrosion inhibitor, water and a defoaming agent The high-performance environment-friendly water-based honing working fluid has excellent lubricating property, foaming property, abrasive dust separating and settling property and penetrating quality
Patent•
24 Dec 2014
TL;DR: In this paper, a multi-station numerical control reaming and honing machine tool for machining a precise cylindrical hole is described, where the main part of the tool consists of a body, a lifting moving part, a rotating workbench part, and a floating fixture part.
Abstract: The invention discloses a multi-station numerical control reaming and honing machine tool, and relates to precision machining equipment, in particular to a multi-station numerical control reaming and honing machine tool for machining a precise cylindrical hole. The multi-station numerical control reaming and honing machine tool comprises a body, a lifting moving part, a rotating workbench part, a floating fixture part and a cutter part, wherein the lifting moving part is arranged on the upper part of the body, and comprises an upright post, a linear guide rail pair, a ball screw pair, a gearbox, a main motor, an ejector plate, a lifting motor and a plurality of main shafts; the rotating workbench part is arranged on the upper part of the body, and consists of a base, a rotating motor, a turntable and a rotating workbench; the floating fixture part is arranged on the upper plane of the rotating workbench, and consists of a bottom plate, a fixture body, a spring seat, a support spring, a guide key, a mounting plate, an inner spring, a pressure block, a positioning block and a plunger sleeve; the cutter part is arranged on the main shafts of the gearbox.
Patent•
04 Jun 2014
TL;DR: In this article, the authors present a machining method for a hardened face gear, which consists of manufacturing a gear cutter, and machining a cutter relieving feeler capable of generating undercutting on the top of the gear cutter.
Abstract: The invention relates to a machining method for a hardened face gear. The machining method comprises the following steps of (1) manufacturing a gear cutter, and machining a cutter relieving feeler capable of generating undercutting on the top of the gear cutter, wherein the cutter relieving feeler is formed outside an effective involute; (2) machining a gear blank, using a gear hobbing machine and a spiral bevel gear milling machine for conducting toothed machining on the gear blank, and forming an effective undercutting curve at the root of the gear; (3) conducting heat treatment, and conducting carburizing and quenching treatment on the gear; (4) conducting hole grinding treatment on an inner hole grinding machine with a gear ring, and conducting outer circle grinding on an outer circle grinding machine with a shaft gear; (5) conducting rolling or milling hardened face machining on the gear on the gear hobbing machine or the spiral bevel gear milling machine; (6) conducting toothed face grinding treatment on the machined gear on a gear honing machine or a bevel gear lapping machine. The machining method for the hardened face gear has the advantages that the tooth portion of the gear is high in machining precision, the cost of grinding teeth is low, and the machining efficiency is high.
01 Jan 2014
TL;DR: In this article, a model to improve the process design of gear honing is described, and a model for improving the process parameters and tool specifications has been proposed to obtain the demanded gear quality.
Abstract: Hard finishing technology is used to manufacture high performance gears. One hard finishing process with undefined cutting edges is gear honing. Gear honing is primarily used to hard finish small and medium sized automotive gears. Trials have shown that gears with a module larger than module m n = 4 mm can also be honed efficiently, but often problems occur due to an unstable process design. Process parameters and tool specifications have to be adjusted to receive the demanded gear quality. In this paper a model to improve the process design is described.
TL;DR: In this paper, the influence of cutting regimes on surface texture and productivity of cylinder liners is shown, obtained by normal honing, and the most influential parameter on maximum peak height, productivity and specific volume productivity is shown.
Abstract: Purpose – In this paper, the influence of cutting regimes on surface texture and productivity of cylinder liner is shown, obtained by normal honing. Furthermore, normal honing power and torque is discussed. The paper aims to discuss these issues. Design/methodology/approach – Normal honing was done on grey cast iron cylinder liners. Both pre- and finishing honing were done by mechanical means, to achieve the required level of surface texture quality, traditionally achieved by a combination of electrochemical pre-honing and mechanical finishing honing. To determine the most influential parameter on normal honing, statistical mathematical model was devised. Surface texture was controlled by light microscope and scanning electron microscope. Findings – Mathematical model describing the influence of cutting speed, feed rate and depth of cut has shown that the most influential parameter on maximum peak height, productivity and specific volume productivity was shown. The most influential parameter has shown to ...
Patent•
30 Jul 2014
TL;DR: In this paper, a manufacturing method of a sliding blade of a compressor with a rolling needle groove is described. But the sliding blade does not need to be arranged on the lateral side of the sliding needle groove and the rolling needs are limited through an arc-shaped side of a groove so as not to fall off from the opening in the upper part of the groove opening.
Abstract: The invention discloses a manufacturing method of a sliding blade of a compressor. The manufacturing method comprises the step of obtaining a qualified sliding blade with a proper base material of the slide blade of the compressor and the step of obtaining a rolling needle groove for arranging rolling needles, wherein the step of obtaining the qualified sliding blade comprises the specific steps of cutting, heat treatment, deburring, nitrifying, fine grinding and grinding; the step of obtaining the rolling needle groove comprise the specific steps of (1) boring, wherein a hole the diameter of which is slightly smaller than that of a rolling needle is bored in one side of the base material of the sliding blade; (2) reaming, reaming in the bored hole; (3) honing, performing honing in the reamed hole so that the hole surface reaches a specified accuracy; (4) cutting, cutting according to a cutting line on the honed base material of the sliding blade and cutting off the upper part of a sliding base material hole to obtain the sliding blade of the compressor with the rolling needle groove. The manufacturing method of the sliding blade of the compressor has the advantage that (1) through boring, reaming and honing to machine the hole, the hole accuracy is high, so that the highly accurate sliding blade is obtained; (2) a limiting part does not need to be arranged on the lateral side of a sliding blade groove, the rolling needs are limited through an arc-shaped side of the groove so as not to fall off from the opening in the upper part of a groove opening.
Patent•
13 Aug 2014
TL;DR: In this article, an automatic graphics parameterized programming system of a numerical control honing machine is presented. But the system is not suitable for the use of a 3D model of a part drawing, and the part and the drawing parameterized system are mainly used for achieving a parameterized definition of part drawing and making preparation for designing and establishing a two-dimensional or three-dimensional model.
Abstract: The invention discloses an automatic graphics parameterized programming system of a numerical control honing machine. The automatic graphics parameterized programming system comprises an input system, an execution system, a function system and an output system. The input system is connected with the execution system, and the input system comprises a part, a drawing parameterized system and a visual man-machine interaction system. The part and the drawing parameterized system are mainly used for achieving parameterized definition of a part drawing and making preparation for designing and establishing a two-dimensional or three-dimensional model. The visual man-machine interaction system is connected with a display, machining parts, graphics information, a cutter, system simulation and numerical control programs of the numerical control honing machine are observed in the display, and automatic graphics parameterized programming of the numerical control honing machine is achieved. The automatic graphics parameterized programming system of the numerical control honing machine has the advantages of being simple in structure, high in machining efficiency, low in cost, good in visualization, high in reliability, prone to automatic programming, high in intelligent degree, high in practicability and the like, and good economic benefits and social benefits can be achieved.
Patent•
30 Apr 2014
TL;DR: In this article, a fixed and combined rod consisting of a guiding portion, a fine portion, and a clamping portion is presented. And the fixed and the combined rod can be clamped through a universal device to be fixed, power is provided for the fixed rod so that it can rotate, and special devices do not need to be used.
Abstract: The utility model discloses a fixed and combined honing rod The fixed and combined honing rod comprises a guiding portion, a honing portion and a clamping portion, wherein the boning portion comprises at least one coarse honing portion and at least one fine honing portion, and the guiding portion, the coarse honing portion, the fine honing portion and the clamping portion are arranged in sequence from the front end to the rear end of the fixed and combined honing rod The fixed and combined honing rod can be clamped through a universal device to be fixed, power is provided for the fixed and combined honing rod so that the fixed and combined honing rod can rotate, special devices do not need to be used, the coarse honing working procedure and the fine honing working procedure can be accomplished in one-time honing operation, the time is saved, honing efficiency is improved, and the cost is reduced
TL;DR: In this paper, a numerical model has been developed to study the potential of use of cylinder bore surface texturing, in the form of circumferential oil grooves with different dimensions and densities, and their efficiency to improve the tribological properties of piston ring-cylinder liner tribo-system.
Abstract: Piston ring lubrication in some types of low-speed 2-stroke marine diesel engines is completely different from those in medium-or high-speed diesel engines since the inner surface of cylinder liners are textured with circular grooves in macro-scale and honing texture in micro-scale. In this paper, a numerical model has been developed to study the potential of use of cylinder bore surface texturing, in the form of circumferential oil grooves with different dimensions and densities, and their efficiency to improve the tribological properties of piston ring-cylinder liner tribo-system. The average Reynolds equation has been employed in the area of micro-scale texture and the effect of macro-scale grooves has been incorporated to improve the currently lubrication model. The results showed that the cylinder liner oil grooves can efficiently be used to maintain hydrodynamic effect. It is also shown that optimum surface texturing may substantially reduce the friction losses between piston ring and cylinder liner.
Patent•
07 May 2014
TL;DR: In this article, a method for forecasting abrasion life of a honing processing honing strip is proposed, which comprises the following steps of firstly collecting measured ABRasion numerical values of the strip in different Honing processing times, accumulating a new series, establishing a whitening-form differential equation of a GM (Gray Model), obtaining a data array B of the GM (1, 1), further obtaining a parameter vector (img file='DDA0000462533150000011.TIF' wi='33' he='60'/) by utilizing the least
Abstract: The invention relates to a method for forecasting abrasion life of a honing processing honing strip. The method comprises the following steps of firstly collecting measured abrasion numerical values of the honing strip in different honing processing times, accumulating a time series of the abrasion numerical values, obtaining a new series, establishing a whitening-form differential equation of a GM (Gray Model) (1, 1), obtaining a data array B of the GM (1, 1), further obtaining a parameter vector (img file='DDA0000462533150000011.TIF' wi='33' he='60'/) by utilizing the least square method according to the data array B and a data vector YN, and finally obtaining a time response function and a time series form of abrasion of the honing processing honing strip according to the whitening-form differential equation of the GM, wherein an abrasion critical value of the honing processing honing strip can be supposed, the honing processing honing strip needs to be replaced when an abrasion value of the honing processing honing strip is larger than the abrasion critical value, and the abrasion life of the honing processing honing strip can be obtained by substituting the abrasion critical value into the time response function of the honing processing honing strip. According to the method disclosed by the invention, the forecasting on the abrasion life of the honing processing honing strip can be realized, and thus the honing processing accuracy and the surface smoothness can be ensured.
Patent•
27 Feb 2014
TL;DR: In this paper, the inner and outer honing devices are arranged in an axial direction relative to the workpiece and an advancing device acting on the honing stones is provided.
Abstract: A honing machine has at least one clamping unit that clamps a workpiece and has a rotary drive for the workpiece. A spindle unit has a stroke drive for an inner honing tool for inner honing of the workpiece. An outer honing device that is movable relative to the workpiece in an axial direction of the workpiece is provided. The outer honing device has several honing stones and an advancing device acting on the honing stones. The honing stones each are advanced in a radial direction relative to the workpiece. The advancing device has at least one linear drive for each one of the honing stones and a common drive motor for all of the linear drives.
30 Sep 2014
TL;DR: In this paper, a methodology was developed to mathematically quantify the folded metal present in engine bores, which is compared to others described in the literature and in use by some European automotive manufacturers.
Abstract: In the last years, sophisticated analyses and control of topography parameters have been introduced to study engine bore cylinders. Such surface characteristics have impact on friction and wear of the engine, with effects on fuel consumption and durability. Among such characteristics, folded metal blocking the honing grooves has received much attention, but its quantification and actual impact on engine performance is still under discussion, both in the academia and in the industry. In this work, a methodology was developed to mathematically quantify the folded metal present in engine bores. The method is compared to others described in the literature and in use by some European automotive manufacturers.
Patent•
02 Jun 2014TL;DR: In this paper, the authors presented a process of producing a ceramic matrix composite gas turbine component from a surface of a gas turbine with a surface roughness of less than 6 micrometers.
Abstract: A process of producing a ceramic matrix composite gas turbine component and a ceramic matrix composite gas turbine component are provided. The process includes modifying a surface of the ceramic matrix composite gas turbine component to produce a modified surface with a surface roughness of less than 6 micrometers. The modifying is selected from the group of techniques consisting of applying unreinforced matrix plies to the surface, vapor depositing silicon on the surface, honing the surface, applying braze paste to the surface, and combinations thereof. The component includes a modified surface including a surface roughness of less than 6 micrometers. The modified surface being selected from the group consisting of unreinforced matrix plies applied to a surface of the ceramic matrix composite gas turbine component, silicon vapor deposited on the surface, a honed surface, a braze paste applied to the surface, and combinations thereof.