Abrading – Abrading process – Glass or stone abrading
Patent
1998-07-14
2000-11-14
Rose, Robert A.
Abrading
Abrading process
Glass or stone abrading
264162, B24B 920
Patent
active
061462527
DESCRIPTION:
BRIEF SUMMARY
The present invention refers to a method of machining a thermosetting laminate, whereby said machining is a planing operation, such as an edge chamfering, an edge trimming, a jagging, a guttering, a grooving or the like. The planing is preferably an edge chamfering. The machining is performed by means of a high-frequency or ultrasonic planing machine having a planing tool consisting of at least one diamond or other material having a hardness according to Vickers of at least 1400-1600 kp/mm.sup.2.
Thermosetting laminates are among other applications used as floor, wall, ceiling or furniture surfacing. Thermosetting laminates used in said application are normally produced in form of or cut into boards, plates, sheets, panels, bars and the like, whereby the laminate optionally is bonded to a carrier consisting of for instance fibre board, particle board, wood, plywood and similar materials. The boards, plates, sheets, etc. are then arranged side-by-side to a covering decorative and/or protective surface. The boards, plates, sheets, etc. are often or even normally machined to produce grooves, tenons, smooth edges, chamfers, jags, channels and the like. The edges of boards, plates, sheets, etc. are normally machined or tooled, using for instance a chamfering plane, to obtain smooth edges and smooth level crossing between boards, plates, sheets, etc. joint side-by-side. A smooth and plane level crossing increases substantially the abrasion resistance over the joint and decreases substantially damages and injuries to for instance an obtained surfacing and to objects, materials and persons coming into contact therewith.
Edge chamfering is normally carried out using a planing machine provided with a planing tool made for instance in a hard metal or metal alloy, such as steel or titanium. This kind of planing is less or not at all suitable for machining of materials such as thermosetting laminates. The hardness of the thermosetting laminates creates as well as emphasise a number of problems and negative effects, which can be summarised: accuracy as well as increased costs and decreased product quality, zone, heavy heat release, to increase the tooling speed or rate, variations in the size and angle of for instance a chamfer.
Chamfering of thermosetting laminates is per se a specific problem in. that the presently and normally machined chamfer of approximately 0.3-0.5 mm or even larger, with a deviation of .+-.0.1 mm or more, does not comply with a long standing customer demand for chamfers of approximately 0.1-0.2 mm or less. Accumulation of particles, dirt and other impurities, giving rise to for instance abnormal abrasion over the chamfer and hygienic problems, is one specific reason why reduced chamfer dimensions are required. The demand can neither be satisfied by conventional planing machines presently used nor by tools as disclosed above. It is from many reasons very difficult or impossible to produce, using conventional planing, cutting or milling machines, a chamfer being smaller than said 0.3-0.5 mm, which even that is difficult to obtain maintaining tooling quality and accuracy at high or at least acceptable levels.
Thermosetting laminates are well-known products used as instance as floor, wall, ceiling, furniture surfacing or as kitchen furnishings, whereby the laminate is decorative and/or protective. A thermosetting laminate most often comprises a core consisting of for instance Kraft paper impregnated with an epoxy resin or a phenol-formaldehyde resin, a monochromatic or patterned paper impregnated with a melamine-formaldehyde or urea-formaldehyde resin and optionally a so called overlay of .alpha.-cellulose impregnated with a melamine-formaldehyde resin. A number of these various papers in form for sheets or webs are laminated together under heat and pressure. Commonly used are also laminates bonded, such as glued, to a carrier consisting of for instance fibre board, particle board, wood, plywood and the like. The various paper sheets or webs, as disclosed above, can also be laminated and thus bonded
REFERENCES:
patent: Re25033 (1961-08-01), Balamuth
patent: 3223056 (1965-12-01), Wilburn
patent: 5303510 (1994-04-01), Calkins
patent: 5305556 (1994-04-01), Kopp et al.
patent: 5318420 (1994-06-01), Blaimschein
patent: 5474488 (1995-12-01), Yamamoto et al.
Perstorp Flooring AB
Rose Robert A.
LandOfFree
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