Showing papers on "Honing published in 2008"

Investigations on the Effect of Ball Burnishing Parameters on Surface Hardness and Wear Resistance of HSLA Dual-Phase Steels

Abstract: Surface finish has a vital influence on most functional properties of a component like fatigue life, wear resistance, corrosion resistance, etc This has given birth to processes such as lapping, honing, burnishing, etc Burnishing is a fine finishing operation involving the cold working plastic deformation of surface layers to enhance the surface integrity and the functional utility of a component The present study has been carried out to establish the effect of burnishing parameters viz feed rate, speed, force, ball diameter and lubricant on surface hardness, and wear resistance of HSLA dual-phase steel specimens The result indicates that burnishing parameters have significant effect on the surface hardness and wear resistance

Analysis of surface roughness and out-of-roundness in the electro-chemical honing of internal cylinders

Abstract: Hybrid machining processes (HMPs) are gaining considerable attention from the manufacturing community in order to meet the challenges of stringent surface quality and tolerance requirements, often coupled with high production rates. This paper presents the experimental findings on the effects of key process parameters in controlling the surface micro-profile and correcting out-of-roundness (OR) in the electro-chemical honing (ECH) of internal cylinders. The results indicate that the current intensity, electrolyte concentration, segment out-pressure and segment grit size are the major contributing factors. A nano-finished surface featured with high uniformity of roughness values can be generated with precisely controlled out-of-roundness if a distinct co-ordination of electrolytic dissolution and mechanical abrading is achieved in ECH. Some key features of the indigenously developed ECH setup are also highlighted.

A hybrid approach for multi-performance optimization of the electro-chemical honing process

Abstract: Electro-chemical honing (ECH) is a unique hybrid electrolytic precision micro-finishing technology that combines electro-chemical machining and conventional honing actions in a single operation to provide simultaneously controlled functional surface-generation and fast material removal capabilities. This paper presents a Taguchi loss function-based hybrid strategy for the multi-performance optimization of ECH process. The proposed strategy utilizes a radial basis function neural network (RBFNN) for the process parametric mapping with the loss functions of ECH multi-performance characteristics determined through a Taguchi matrix robust experimental design. The network outputs are then unified using desirability function (DF) approach to provide an objective function to genetic algorithm (GA). Finally, GA predicts the optimal process parametric settings for multi-performance optimization of ECH. Simulated results confirm the feasibility of the strategy and show good close agreement with actual experimental results over a wide range of machining conditions employed in the process.

Experimental investigations on electrochemical honing

Abstract: Electrochemical honing (ECH) is an electrolytic precision mircofinsihing technology based on the hybridization of the electrochemical machining and conventional honing process principles to provide...

Multi-barrier water purification system and method

Abstract: Disclosed herein are systems and methods for decontaminating a contaminated fluid that integrate ultraviolet radiation in an advanced decontamination process, and a honing material, along with a cross-flow membrane filter, into a single closed-loop system. This approach combines the advantages of chemical-free advanced decontamination technology, long-life wiper-free UV disinfections, and maintenance-free ceramic MF/UF membranes to provide multi- barrier protection. Such technique provides a 100% fluid recovery system (zero reject stream). In one embodiment, the system comprises a filtration membrane and a honing material located in the contaminated fluid that is sufficient to scrub foulants from the membrane, as well as any other components that honing material comes in contact with, while forming a dynamic filtration coating on the membrane as the contaminated fluid pass through the membrane. The system may also comprise an advanced decontamination process sufficient to destroy, by oxidation or reduction, biological and organic contaminants from the contaminated fluid.

Evaluation of Hydrogen Embrittlement by Internal High-Pressure Hydrogen Environment in Specimen

Abstract: A simple testing method for mechanical properties of materials in high-pressure hydrogen environments has been developed. This method does not require any high-pressure vessel but the high-pressure hydrogen environment is produced inside the hole in the specimen. The specimen temperature is easily controlled by outside environment. The effects of hydrogen environment embrittlement (HEE) for SUS304 and 304L at 298, 190, and 77 K were evaluated by the ratio of reduction of area obtained in tensile tests in hydrogen to that obtained in helium. The results of the evaluation by this testing method agreed fairly well with the results by the usual method using a high pressure vessel. The hole in the specimen was machined by electric discharge, wire-cut, and honing. The influence of surface roughness on HEE was compared among these processes and the wire-cut machining was found to be enough for this new method. Changes of HEE with temperature and fracture surface by hydrogen proved the usefulness of this new simple method.

Deep hole honing head

Abstract: The utility model relates to a long-hole honing head. The honing head body is inside provided with a taper core rod, the left and right side of which are provided with two mandrils; the right end of the taper core rod is provided with a connecting flange which is inside provided with a linear bearing; the left end of the honing head body is provided with an end cover connected by bolts; the top circle of the honing head body is provided with 6 whetstone seats which are in even interval distribution and provided with honing whetstones and 6 guard bars that are in even interval distribution; the right side and the left side of the whetstone seats are hung with drag springs. The long-hole honing head of the utility model adopts measures such as applying a plurality of honing abrasive belts and increasing the positive pressure of the hole wall of the workpieces by the abrasive belts, thus quickening the process of removing finish allowance, meeting the size requirements of aperture quickly and achieving the characteristics high efficiency and rapidness.

Tool condition monitoring in honing process using acoustic emission signals

Abstract: Sensing Acoustic Emission (AE) signals from a machining process is one of the most promising methods suitable for tool condition monitoring because of its sensitivity combined with quick and high frequency response. In this work, AE signals are monitored during rough, finish and plateau honing of cylinder liner using fresh and completely worn out honing tools. AE parameters such as Root Mean Square (RMS), peak to peak, skewness and kurtosis and dominant frequency in the power spectrum are analysed. The results show that the dominant frequency in the power spectrum is very sensitive to honing tool conditions and a good correlation exists with honed surface quality. Therefore, AE signals can be used for ascertaining the honing tool performance and establishing the end of tool life.

Honing method and honing control device

Abstract: A honing method and honing control device (1) suitable for the honing having a large processing area is provided. The honing control device includes a grinder (7) and an expansion member for disposition in a processing hole of a workpiece. The amount of an expanding movement when the grinder contacts the inner surface of a gauge hole via the expansion member is stored as a target expansion amount by inserting a honing head (3) into the gauge hole having the same size as a target processing diameter of a master gauge (30). Then, a honing of an inner surface of the processing hole is performed by inserting the honing head within a processing hole (W1) of a workpiece (W) moving the grinder towards an outer side of a diametrical direction by the expansion member installed within the honing head to rotate the honing head. The honing is completed when the amount of the expanding movement of the grinder reaches a target expansion amount established by the master gauge.

Cone hole honing tool

Abstract: The utility model relates to a conical inner bore honing tool which is characterized in that: the honing tool comprises a cutter bar, a spring, a spring shaft, a whetstone support and a whetstone which is fixedly arranged on the whetstone support; the cutter bar is equipped with stepped holes along the radial direction; the spring is sheathed on the spring shaft; the spring shaft and the spring which is arranged on the spring shaft are positioned in the stepped holes; the spring shaft is tightly fixed on the cutter bar through nuts and the other end of the spring shaft is in rivet joint with the whetstone support; the whetstone support is long groove shaped and inside the long groove is provided with the whetstone. By adopting the conical inner bore honing tool of the utility model during production process, the honing tool not only guarantees the processing precision of the conical surface but also meets the requirements of surface roughness, meanwhile, the conical inner bore honing tool has small volume and is easy to be disassembled and suitable for processing pieces with different tapers.

Main axle servo feeding mechanism for numerically controlled deep borehole honing machine

Abstract: The present invention discloses a main shaft servo feed mechanism of a numerically controlled deep hole honing machine, which comprises a base seat, a main shaft, a main shaft motor, a honing head feed mechanism and a honing head mechanism, wherein, the output shaft of the main shaft motor is connected with the main shaft via a main shaft reduction gearbox, and the main shaft is of a hollow structure. The honing head feed mechanism comprises a servo motor, a servo reducer and an ejector pin, wherein, the servo motor and the servo reducer are arranged on the base seat, the ejector pin is arranged along the axial direction of the main shaft in the main shaft, the output shaft of the servo reducer is firmly connected with the outer end of a screw rod, a spline nut is suitably screwed on the inner end of the screw rod, a fixed sleeve fixed on the base seat is suitably nested on the spline nut, the inner end of the spline nut is connected with the rear end of the ejector pin, and the front end of the ejector pin pushes a push rod connected with the honing head. The present invention converts the rotating movement output by the servo motor into the axial linear movement of the push rod of the honing head, a numerical control system is applied to control feed, which can be of constant quantity, constant pressure or the combination of constant quantity and constant pressure, and the accuracy of feed is high.

Honing tool with adjustable pressure

Abstract: The utility model discloses a pressure-adjustable honing head, which includes a tail rod (1); the tail rod (1) is connected with a connecting sleeve (2) by screw threads, the connecting sleeve is connected with a wheelhead body (3) by screw threads, and a honing head (4) is mounted on the end of the wheelhead body (3); an expension core (5), a push rod (6), a spring (7) and a plug screw (8) are orderly arranged in the connecting sleeve (2); a cone (9) is arranged on the end of the expension core (5), steel balls (10) are arranged at the position of the cone (9), and holes (11) are arranged on the wheelhead body (3) corresponding to the steel balls (10) which are contacted with the honing head (4) via the holes (11) The pressure of the honing head provided by the utility model, which is applied on the inner walls of a honed hole, can be adjusted, thus increasing honing efficiency as well as the quality of processing hole The pressure-adjustable honing head can satisfy the requirement on the processing of blind holes and stepped holes

Multi-performance modeling and optimization control strategies for electro-chemical honing: a critical evaluation

Abstract: Electro-chemical honing (ECH) is a hybrid electrolytic precision micro-finishing technology that integrates physicochemical actions of the electro-chemical machining and conventional honing processes to provide controlled functional surface-generation and fast material removal capabilities in a single operation Three different strategies, namely the utility-based Taguchi approach, Taguchi–RBFNN–DF–GA strategy and GA-tuned fuzzy Taguchi inference application, have been recently reported by the author for multi-performance modeling and optimization control ECH process In this work a critical evaluation of their prospective features, strengths and weaknesses has been done for benefit of the user and research fraternity The methodologies have been demonstrated using a case study of multi-performance modeling and optimization control ECH, involving three performance criteria Results indicate that all three techniques are well suited to the complex manufacturing processes that involve several correlated variables with vaguely defined parametric relationships like in ECH It was also found that the predicted optimal results are sensitive to the way the factorial interactions are treated The actual experimental results at the optimal parametric conditions predicted using the three approaches are quite close

Device for fine machining workpieces

Abstract: The invention relates to a device for fine machining workpieces, preferably for honing and/or fineboring cylinder bores in crankcases of internal combustion engines, wherein inside a module (1) one or two horizontally displaceable machining units (10, 11, 12, 13) each are provided on two longitudinal sides (2, 3) that are opposite each other for honing and/or fineboring. Each machining unit (10, 11, 12, 13) comprises a spindle (100), a drive for creating the oscillating stroke movement of the spindle (100) and for displacing the machining unit into the working position, a tool holder (8) with a rigid axis, and a feed device (60, 61, 62, 63, 64) for the radial feeding of the machining tools, and between the longitudinal sides equipped with the machining units (10, 11, 12, 13) a service chamber (7) that can be accessed from an end side, wherein at least one tool magazine (30, 31) is associated with the machining units (10, 11, 12, 13) at the rear end side (4) of the module (1).

Investigations on the Effect of Ball Burnishing Parameters on Surface Roughness and Corrosion Resistance of Hsla Dual - Phase Steels

Abstract: Surface finish has a vital influence on most functional properties of a component, such as fatigue strength, wear resistance and corrosion resistance. This has led to processes such as lapping, honing, and burnishing. Burnishing is a fine finishing operation involving the cold working and plastic deformation of surface layers to enhance the surface integrity and the functional utility of a component. This study has been carried out to establish the effect of burnishing parameters, i.e. feed rate, speed, force, ball diameter and lubricant on surface roughness and corrosion resistance of HSLA dual – phase steel specimens. The result indicates that burnishing parameters have a significant effect on surface roughness and corrosion resistance. Keywords : Hardness; Burnishing; Factorial Design; Inter-Critical Temperature East African Journal of Sciences Vol. 2 (2) 2008: pp. 164-169

Honing tool having enhanced wear resistance properties

Abstract: A honing tool for honing holes in workpieces, having an abrasive portion including a first abrasive layer therearound of abrasive particles of a first size, including a region having a second abrasive layer of abrasive layers of a second size sufficiently smaller than the first size, so as to be disposed in interstices between abrasive particles of the first abrasive layer without altering the diametrical size of the first layer, and so as to provide enhanced wear resistance.

Research on System Design of Ultrasonic-Assisted Honing of Gears

Abstract: Ultrasonic vibration can reduce honing forces efficiently. As the honing wheel can be washed by ultrasonic cavitations of cutting fluids, its jams are decreased and the higher honing efficiency has been obtained. Therefore, gear honing combined with ultrasonic machining honing is a method for gear finish machining with its wide application future. Ultrasonic-assisted honing of gears is firstly proposed, its machining devices are manufactured based upon the design parameters derived by four-terminal network principle. Experiments of gear honing show that the machining traces on the tooth flanks in ultrasonic and traditional honing are different. The ultrasonic honing can produce a better tooth surface roughness (Ra 0.45 μm) than one obtained conventional honing (Ra 0.72 μm).

Water-soluble cutting liquid for super-fine honing

Abstract: The invention relates to a water-soluble cutting fluid used for the metal super-fine honing and the preparation method thereof. The preparation method comprises the following steps: firstly, a modified vegetable oil rust inhibiting lubricant is prepared; secondly, 7 to 10 parts of triethanolamine, 1 to 2 parts of boric acid and 1 to 2 parts of sebacic acid are added into a reaction container in weight ratio, and are stirred and heated to 95 DEG C, 10 parts of deionized water, 5 parts of modified vegetable oil rust inhibiting lubricant, 1 part of polyether polyol and 0.05 part of tolyltriazole are added in sequence in weight ratio, and the heating is stopped and the stirred is continued until the mixture is uniform and transparent. The cutting fluid is used after being diluted by adding water, and can replace the generally used cutting oil for super-fine honing; all the performance indexes reach or exceed the third class relevant indexes of GB6144-85; the oil mist is lower when in use, no penetrating odor exists, no special requirement to the water quality exists when the concentrated solution is diluted, and the fluid changing period is long.

Technical standard of cylinder cover inner hole platform honing reticulate pattern based on three-dimension

Abstract: The invention discloses a technical standard based on a three-dimensional cylinder liner inner-hole platform honing reticulate pattern. A contact or non-contact three-dimensional roughness measuring apparatus is adopted to test the cylinder liner inner-hole platform honing reticulate pattern, provide two-dimensional and three-dimensional scanning patterns, read out three-dimensional parameters to form a technical standard, and evaluate the platform honing reticulate pattern; the three-dimensional parameters of the technical standard includes the parameters that evaluates the surface defects, reticulate-pattern angle, functional parameters, the degree of three-dimensional surface skewness and the three-dimensional root mean square deviation of the surface. The application of three-dimensional parameters change the theoretical defect of former two-dimensional parameters, and more universality can be achieved when the requirement of cylinder-liner reticulate pattern is satisfied. The invention replaces traditional double-membrane testing method, a three-dimensional roughness measuring apparatus is used to change the situation of poor efficiency and limited precision of reticulate-pattern testing method; rigid control of the quality of cylinder liner can be achieved based on the features of fine structure such as piece cap, rough peak valley and other quantitative requirements.

Cbn end mill

Abstract: PROBLEM TO BE SOLVED: To provide a CBN end mill in which the strength of the cutter tip is increased while a prescribed sharpness in cutting is secured, capable of enhancing processing conditions including cut in depth, feeding speed, etc. SOLUTION: The CBN end mill is structured so that its peripheral cutting edge 18 is inclined at a twist angle λ (=-3° to -18°) from the axis O in such a manner as twisting in the direction opposite the rotating direction in machining viewed from the shank 12s side, so that the rake angle in the axial direction in the corner part 24 at the tip of the peripheral cutting edge 18 in the axial direction becomes negative (the same as the twist angle λ), which allows enhancing the strength of the cutter tip owing to increase of the cutter tip angle and suppressing chipping of the cutting edge. If chipping is suppressed as described, there is no need to round the cutter tip by a chamfering process such as lapping, honing, etc., it is possible to stabilize the machining performance, secure the prescribed sharpness in cutting, enhance the strength of the cutter tip, and also enhance the processing efficiency by heightening the processing conditions including cut in depth, feeding speed, etc. COPYRIGHT: (C)2008,JPO&INPIT

Superfinishing equipment for metal stretching opposite-clipping testing machine opposite-clipping pincers mouth internal hole

Abstract: The utility model is a super-finish machining device for an inner hole of a wafer nipper jaw of a metallic tension wafer testing machine. The utility model is characterized in that: an elastic floating shaft is arranged in the super-finish machining device, and the other end thereof vertical to the elastic floating shaft is provided with a super-grinding wheel which is disposed in the inner hole of a fixed seat, and the other end of the fixed seat is fixed on the boring row of a flat turning disc of a boring machine, the super-grinding wheel can implement the radial feeding by leveraging the rotary motion of the flat turning disc, the super-grinding wheel contacts with the surface of the workpiece, and the super-grinding wheel implements low speed super-finish grinding to the surface of the workpiece in a floating state under the pressure of a spring and relying on friction. The utility model solves the problems of the inner hole super-finishing of large and ultra-large high precision parts with complex shapes, and has advantages of convenient operation, simple technique and low cost. The utility model replaces the special large high precision machine tool and similarly carries out the honing and super-finish machining, and conducts low speed super-finish smooth grinding to the surface of the workpiece in the floating state of the fine particle grinding wheel.

Universal self-centring honing tool

Abstract: The utility model discloses a universal self-centering honing head, which comprises a tail rod (1), a connecting rod (2) and a connector (3); the tail rod, the connecting rod and the connector are universally connected with pin shafts (5) via rocking rings (4) in order; the end of the connector is provided with honing material slots (6), in which the honing head (7) is firmly mounted by rubber rings (8). The utility model replaces the original straight honing shank of the prior art with two universally connected honing shanks, consequently, during honing, the honing head can realize automatic centering and, in stead of being strictly aimed at the center of a hole, can be automatically aligned with the center of the processed hole, thus avoiding the precision deterioration of the shape and dimension of the processed hole or the condemnation of the processed hole, which is the result of orientation and positioning errors between the honing head and the processed hole on a shell.

Removable device of rotary tool

Abstract: PROBLEM TO BE SOLVED: To provide a comparatively easy-to-constitute removable device of a rotary tool capable of easily and quickly detaching a honing tool from a spindle of a honing machine for example, for honing processing, while securing a required rotary accuracy. SOLUTION: This device comprises a stationary side holder 1 fixed to a tip end of a spindle, and a detaching side holder 2 fixing a base end of a rotary tool 3. An insertion pestle 12 of the detaching side hole 2 is inserted in a holding cylinder 11 of the stationary side holder 1, and balls 6 are engaged with lock indented grooves 13, 13, so that each of the balls 6, 6 are restrained by pressurizing sleeves 7a, 7b. COPYRIGHT: (C)2008,JPO&INPIT

Honing grinding wheel

Abstract: PROBLEM TO BE SOLVED: To provide a honing grinding wheel with a super-abrasive metal bonded grinding wheel and without a truing operation at an initial stage of mounting to a honing tool. SOLUTION: A square-pole-like grinding wheel 5 is integrally jointed to a grinding wheel platform 6, and the grinding wheel 5 is a super-abrasive metal bonded grinding wheel obtained by bonding super-abrasives such as fine diamond abrasives and CBN abrasives by a metal bonding material. A grinding wheel surface portion of the super-abrasive metal bonded grinding wheel 5 is formed of a fragile grinding wheel layer 7 having multiple indented and projected surfaces. Thereby, by mounting a subject workpiece to a honing tool of a honing machine and honing it, the portion of the fragile grinding wheel layer 7 is abraded and dropped generally by a first honing processing, and the grinding wheel face 5a is entirely brought into contact with an inside diameter face of a processed hole of the workpiece. As a result, the grinding wheel face 5a is formed into a round shape along the inside diameter face of the processed hole. COPYRIGHT: (C)2008,JPO&INPIT