Showing papers on "Roller burnishing published in 2004"

Method for roller burnishing a heater tube

Abstract: A process for placing a roller burnished finish on the central portion of an unfinished lathe-turned heater tube includes controlling the rotational speed of the burnishing rollers and the pressure of the burnishing rollers against the central portion of the heater tube so that tooling marks are no longer apparent under substantially 10× magnification and the length of the central portion of the heater tube increases by no more than 0002 inches per inch of length of the central portion of the heater tube

Method for finishing bearing points on journals of crankshafts of vehicle engines has rounded areas between bearing points and transitions which are roller burnished and then bearing points are machined with shallow cutting depth

Abstract: The crankshafts have rounded areas (14) between the bearing points and the transitions (7) adjoining same which are then roller-burnished with a roller-burnishing tool. Whilst keeping a distance (17) from the relevant transition the bearing point (11) is then machined with a shallow cutting depth (18, 20). The rolling depth when roller burnishing the rounded areas (14) is preferably 0.2 mm and the cutting depth is preferably 0.25 mm. Independent claim describes crankshaft (1) which has touching radii (15) between the transitions and the relevant bearing points.

Roller burnishing tool main body and roller burnishing tool

Abstract: PROBLEM TO BE SOLVED: To provide a compact roller burnishing tool applicable to an inside diameter of a small diameter, suitable for multiuse of outside face and end face machining, and adjustable in workpiece pressing force to obtain an excellent finished surface. SOLUTION: This roller burnishing tool 10 is provided with a cylindrical shank 5, a head 4 internally provided in the shank 5 via a rotary shaft 9 and rotated by the workpiece pressing force, and a roller 2a for roll machining. The tool 10 is provided with an energizing means in a shank shaft direction provided in the shank 5, an energizing force adjusting means for adjusting the generated energizing force, and an energizing force converting means for transmitting the energizing force to a head shaft 4b and converting the direction of the energizing force into a rotating direction of the head shaft 4b, to control the workpiece pressing force generated at the time of the roll machining. COPYRIGHT: (C)2006,JPO&NCIPI

Corrosion behaviour of c45 carbon steel after mechanical surface finishing

Abstract: The paper presents the results of research, concerning the increase of corrosion resistance of C45 carbon steel after the processes of mechanical surface finishing. In this stage of the research, the electrochemical studies of the corrosion rate were carried out by means of impedance methods. The electrochemical impedance spectroscopy (EIS) is modern, quick, and non-destructive method used to the study of corrosion rate. The samples were prepared by abrasive polishing using eight varying grit papers in the range from 180 up to 4000. Four representative groups of characteristic magnitudes of surface roughness were selected subject to the electrochemical investigations, with each measurement lasting 100 s. Two different media, based on sodium chloride as the corrosive agent, were applied for the electrochemical studies, with one of them imitating the synthetic sea water environment. The electrochemical investigation results revealed the effect of polishing operations and the grit abrasive paper used on the corrosion resistance of the carbon steel studied. The big number of results required a statistical approach, to make possible finding a direct relationship between the surface roughness after polishing and the corrosion rate. It was found that the corrosion rate may be decreased several times without using any corrosion inhibitor or protective coating. The next stage of the corrosion study is planned concerning the mechanical finishing treatment of the surface with the use of roller burnishing with electric current.

Method of manufacturing a rotary shaft

Abstract: Three solid round bars are prepared as auger members, respectively as a main body member, an upper shaft member, and a lower shaft member. End surfaces of the members are coaxially joined together by friction welding. Turning machining is then performed by using a lathe, forming a helical blade, a spline, and the like. In addition, burnishing is performed on a corner portion that includes an outer circumferential edge of a joining surface where friction welding is performed, and another corner portion that includes an outer circumferential edge of another joining surface where friction welding is performed. The burnishing is performed by pressing a roller, which is freely rotatable about a roller support shaft center of a Superoll, toward the corner portions of the rotating auger. Roller burnishing may also be performed two times on the same location, with a predetermined time interval therebetween.

Leak repair method

Abstract: The present invention is a novel method for the repair of cast aluminum wheels that leak air due to porosity caused during the casting process. It involves deep roller burnishing the surface of the wheel under controlled operating parameters to effectively seal the porosity so that the wheel no longer leaks air.

Aluminum wheel manufacturing method, and lightweight aluminum wheel

Abstract: PROBLEM TO BE SOLVED: To provide a method for manufacturing an inexpensive and lightweight aluminum wheel capable of solving a problem that the structure of a rim portion of the cast aluminum wheel is coarse and the strength thereof is weakened, and each portion can be thin-walled by enhancing the strength of a spoke portion with cyclic loads applied thereto. SOLUTION: The method for manufacturing the aluminum wheel comprises a step (flow forming) of repeating the rolling a plurality of times in which a wheel stock 1 is rotated, a rolling roll 3 is pressed against an outer circumference 1b of a rim stock, and moved from a flange 1h side to an inner rim 1c side. The aluminum wheel manufacturing method also comprises a step (roller burnishing) of pressing a roller 4 against a spoke surface 1j, a spoke inner surface 1k, a rim outer surface 1m and a rim inner surface 1g while rotating the stock wheel 1, and moving the roller while performing local deformation to press each surface. COPYRIGHT: (C)2004,JPO&NCIPI

Rolling slide member, manufacturing method therefor and rolling bearing

Abstract: PROBLEM TO BE SOLVED: To provide a rolling slide member that can elongate the lifetime and a manufacturing method therefor, besides it can make miniaturizing the crystal grain of a rolling slide section face and consequently improve the strength. SOLUTION: Beside a roller burnishing process is performed two or more times in the condition that the lubricant is supplied to the track section (rolling slide movement section) 1c of an inner ring (rolling slide movement member) 1 composed of a bearing steel, the traction power given to the track section 1c through an oil membrane D of the lubrication oil (lubricant) from the mirror face ball (jig) C performing the roller burnishing process at one time of process at least among two or more times of the roller burnishing process is increased more than that of the other processing time and the crystal particle size of the surface of the track section 1c is made to be more than the JIS particle size number 12. COPYRIGHT: (C)2004,JPO

Roller burnishing method and burnishing device

Abstract: PROBLEM TO BE SOLVED: To provide a roller burnishing method and burnishing device, obtaining a desired surface roughness, and heightening the durability and working performance. SOLUTION: In this roller burnishing method and device for finishing with a burnishing roller 3 pressed to a work 4 having a surface to be worked circular-arc in section, the surface to be worked of the work W is machined to be recessed at the center Wa by lapping, and then the projecting parts Wb at both end parts are burnished by the burnishing roller 3. COPYRIGHT: (C)2005,JPO&NCIPI

Rolling bearing member, and method for manufacturing rolling bearing member

Abstract: PROBLEM TO BE SOLVED: To restrict generation of peeling starting from an inner part due to non-metal matter included even when low purity steel including large grains of non-metal matter is used. SOLUTION: This rolling bearing member comprises low-purity steel including large grains of grain size of 30 μm or more. The non-metal matter 2b existing in a surface layer part of a rolling surface 1c of the rolling bearing member is crushed by roller burnishing work to be granulated to have maximum grain size of 20 μm or so. COPYRIGHT: (C)2004,JPO&NCIPI

Roller burnishing machine

Abstract: PROBLEM TO BE SOLVED: To provide a roller burnishing machine, using an ordinary cylindrical burnishing roller in the case of burnishing a work so that the surface of a machined part is like a concave to be higher in the middle than on both sides of the machined part, improving surface property and product profile, improving load balance, preventing uneven abrasion, little causing a change in contact area, and finishing the work improved in operational stability and durability in long-time use. SOLUTION: In this roller burnishing machine, the burnishing roller 3 is pressed to the work W having a circular-arc outer peripheral surface to transfer the surface shape of the burnishing roller 3 thereto. The burnishing roller 3 disposed along the axis of the work W and having a cylindrical outline is rocked to perform burnishing so that the surface of a machined part of the work W is like a convex to be higher in the middle than on both sides of the machine part. COPYRIGHT: (C)2004,JPO&NCIPI