Honing

About: Honing is a research topic. Over the lifetime, 3530 publications have been published within this topic receiving 17491 citations.

Recent advances in ultraprecision abrasive machining processes

Abstract: Traditional approaches to understanding ultraprecision machining processes such as grinding, polishing, lapping, micromachining, machining, etc., have focused on developing analytical, semi-empirical and empirical models that seek to explain the output of processes based on many input variables. However, those models are not very well suited to providing inputs to develop improved abrasive products such as grinding wheels, lapping wheels, honing laps, coated abrasives, loose abrasives and their associated bonding systems and lubricants. In order to develop new products to improve ultraprecision processing of materials, it is necessary to focus on the mechanisms of microscopic interactions between abrasive products and the workpiece material. This paper reviews the current grinding theories and the methods employed to understand microscopic interactions due to cutting, plowing and sliding motions and how they can be used to develop new products using materials science principles that enhance and uniquely describe the removal of material in ultraprecision machining processes.

Machine part with improved surface texture for rolling contact and/or sliding contact

Abstract: A machine part includes a surface suitable for rolling contact and/or sliding contact on another machine pad and made by an at least two-stage honing process, with a first honing step effecting a surface texture exhibiting a plurality of peaks and a plurality of pits and defining a mean profile line, and a second honing step for removal of the peaks to a level of the mean profile line for forming a plateau-like tenure that is interrupted by crossing pits, whereby the depth of the pits from the first honing step is maintained. Subsequently, abrasive grain is pushed into the surface for creating a crater-like recess, thereby displacing material at random in horizontal and venial directions for at least partially closing the pits. Mounds created during material displacement and positioned above the mean profile line are removed through a subsequent polishing process.

Honing process and machine for finishing gear teeth - has abrasive gear hone in mesh with workpiece gear and electronically coupled spindles so that pitch errors in gear can be measured and corrected by modifying relative speeds

Abstract: The gear (1) to be finished is rotated in mesh with the honing tool (3) which is in the form of an internal gear with abrasive teeth which remove metal from the workpiece gear during rotation. The spindle drives of the workpiece gear and the honing tool are electronically coupled. Before machining takes place, the honing tool is rotated in mesh with the workpiece gear, which is allowed to rotate freely under no load. The deviations from true angular displacement of the workpiece gear are registered by the control system. The electronic coupling is then engaged and during machining uses the stored information on the gear errors to modify the relative speeds in a way that varies the metal removal rate and corrects the overall pitch error of the gear. USE/ADVANTAGE - High gear quality. Short machining time. Suitable for high volume production.

On edge honing devices

Abstract: A honing device for mounting on a honing tool for rotation therewith including a backing material 12 having opposite end surfaces 18, 20, opposite side surfaces 14, 16, and an edge surface 22 extending between the opposed end and side surfaces, and a layer of an abrasive 26 such as a superabrasive material and a binder attached onto one of the side faces and extending therealong to the edge surface whereby an edge of the abrasive layer and the adjacent edge surface engage the workpiece surface to be honed. The abrasive material may be attached to the backing material by a three stage electrolytic or electroless plating process.

Effect of grain size and density of abrasive on surface roughness, material removal rate and acoustic emission signal in rough honing processes

Abstract: Honing processes provide a special cross-hatch pattern to the internal surface of cylinders that favors oil flow. However, along honing operation the abrasive grains wear out and lose their ability to cut material. The honing chips mixed with oil fill the pores of the abrasives and they start cutting in an incorrect way, leading to clogging. In the present paper, honing experiments were carried out according to a 32 factorial design, with different grain size and density of abrasive grains. Roughness, material removal rate, and tool wear were determined. Acoustic emissions were also measured and the chirplet concept was applied in order to detect differences between correct and incorrect cutting operations. As a general trend roughness and material removal rate increase with grain size and with density of abrasive. However, when clogging occurs roughness and material removal rate decrease, because the abrasive grains tend to deform the material instead of cutting it. When the honing process is working appropriately, the chirplet diagram of the harmonic part of the signal shows constant marks. On the contrary, when it does not work properly, marks disappear with time and their frequencies decrease. The results of the present paper will allow monitoring the honing process in order to change the abrasives when they are not working properly.