Showing papers on "Roller burnishing published in 2006"

The state of the art and recent results of magnetism-aided surface improving and edge finishing processes

Abstract: Magnetism Aided Machining (MAM) comprises a number of relatively new industrial machining (firstly finishing and surface improving) processes being developed at the present time too. MAM is effective - among others - in polishing, deburring and burnishing of metal parts. The authors give a brief outline of these modern processes, and make an attempt to systematize them. The paper summarizes the results of the experimental research work carried out by the authors mainly in field of magnetism-aided abrasive machining and roller burnishing in finishing and deburring operations.

Prediction of residual stresses in roller burnished components : a finite element approach

Abstract: Surface finish is an important factor in creating the durable metal components, and fatigue strength can be improved if compressive residual stresses are produced in the surface. Burnishing is a finishing process and compressive residual stresses are induced during the process. The present study of minimizing the surface roughness based on the experimental work, and finite element model was developed to evaluate the analytical results. Commercial purity Mild Steel and Aluminium were selected as work specimens and a high carbon high chromium roller was used as a tool for the burnishing process.

Tool diameter variable type roller burnishing machine

Abstract: PROBLEM TO BE SOLVED: To provide a tool diameter variable type roller burnishing machine capable of forming a flat machined surface. SOLUTION: The tool diameter variable type roller burnishing machine has a shank 5, a cylindrical frame 3, a plurality of rollers 2 with a tapered part, and a head 4 with a tapered part corresponding to the tapered part of the roller 2. The machine is composed of a movable hub 6 integrally joined with the head 4, a cylinder part formed so as to surround the movable hub 6, two fluid pressure chambers 10, 11 respectively formed to the front and the rear of the movable hub 6, a swivel joint 9 having fluid inlet ports 91a, 92a made to communicate with the fluid pressure chambers 10, 11, and two-system flow passages 84, 85 formed to the cylinder part made to communicate with respective fluid pressure chambers 10, 11 from the inlet ports 91a, 92a. COPYRIGHT: (C)2006,JPO&NCIPI

Roller burnishing tool for rounding corner

Abstract: PROBLEM TO BE SOLVED: To provide a roller burnishing tool which can round the corner portion of a workpiece by turning the tool beside turning the workpiece. SOLUTION: The roller burnishing tool comprises a roller 5, a shank 3, a retainer 6 for retaining the roller so as to rotate and move to the preset tilting direction, mandrels 12, 14 which hold the retainer 6 so as to rotate and axially slide and are provided with an approximately chevron shape recessed portion 12a formed to retain the roller 5, and a first energizing means 10 for energizing the retainer 6 in the forward direction of the tool. The roller burnishing tool further comprises a mechanism for adjusting the machining diameter of the tool by moving the roller 5 along the recessed portion 12a formed on the mandrel 12 by receding the retainer by pushing the roller 5 against the portion to be rounded. COPYRIGHT: (C)2006,JPO&NCIPI

Method of manufacturing common rail

Abstract: PROBLEM TO BE SOLVED: To provide a method of manufacturing a common rail with high durability by providing a compressive residual stress to the inner peripheral surface of a flow passage by a roller burnishing to suppress the advancement of internal fatigue so as to increase an internal fatigue strength. SOLUTION: A plurality of through holes are axially formed in the peripheral wall of the flow passage extending in the axial direction in which a high-pressure fuel flows. A pressure receiving seat surface enlargedly opening in the peripheral surface direction so that branch connection bodies having flow passages led to the flow passage are connected continuously with each other is formed in each of the through holes. A pressing seat surface formed at the connection end part of a branch connection body is abutted and engaged with the pressure receiving seat surface to connect the common rail to the branch connection body. The inner peripheral surface of the flow passage is finished by roller burnishing. A roller burnishing device RB is axially pulled relative to the common rail 10, and rotated relative to the common rail for burnishing. COPYRIGHT: (C)2007,JPO&INPIT

Roller burnishing machine for crankshafts

Abstract: The invention relates to a roller burnishing machine, in which the force device (13) is mounted in manner that enables it to be displaced along the direction (30) of its force effect inside a gate (31). The force unit (13) is, via one end (32), connected in an articulated manner by means a joint (33) to the end (11) of a shearing arm (3) of the roller burnishing unit (15). The free end (34) of the gate (31) is provided with a guide roll (35), which is guided along a curved path (36) that is recessed in the end (11) of the shearing arm (3). Three joints (28, 29, 33) form a triangle (37) when the force unit (13) is in the closed position. One of the joints (28) points toward the rotating joint (5) via which both shearing arms (3 and 4) of the roller burnishing unit (15) are connected to one another in an articulated manner. When the force unit is in the closed position, a bent lever (27) rests against the stop (39) at the end (12) of the shearing arm (4).