摘要:
A flat glass sheet of a given outline configuration is supported in a shaping station by a combination of a gas hearth bed portion and readily replaceable flat plate means comprising spaced plates having spaced edges of conforming shape that define an elongated slot conforming to the outline shape of at least a portion of the periphery of the flat glass sheet. The gas support bed portion provides hot gas under pressure to float the flat glass, and the flat plate means is located in close proximity to an end of the gas hearth bed portion to provide a narrow space at the level of the gas hearth bed portion for escaping gas between the flat plate means and the extending glass sheet portion to limit sag of the extending glass sheet portion. The flat plate means may be covered by material that does not mar hot glass, such as boron nitride, in case the glass sheet portion sags a limited distance to slide in contact with the flat plate means before it is lifted on a shaped, ring-like member.
摘要:
Glass sheets arriving at a bending station where their under surfaces are exposed to a hot gas support bed are delivered with minimum misalignment and misorientation by engaging each sheet simultaneously across its entire width with at least two rotating conveyor rolls. The latter are spaced from one another longitudinally of a path of glass sheet travel a distance sufficient to optimize flow of hot gas against the engaged glass sheet surface. This invention enables the leading edge of glass sheets of either rectangular or non-rectangular outline to nest within aligning means located in a fixed but adjustable position at the bending station. Provision is made to handle two or more sheets arriving at the bending station in side-by-side relation.
摘要:
In tempering glass sheets vertically hung from tongs, the uniformity with which tempering medium is applied toward the glass sheets during quenching is improved by providing the quenching apparatus with means to provide finer control of the flow rate of tempering medium against the opposite major surfaces of the glass sheets than one gets from valving branch conduits in order to prevent side-to-side swaying of the glass sheets during quenching, particularly when the sheets are curved. Such means to provide fine control is also useful in quenching glass sheets supported in other than vertical orientations during quenching.
摘要:
Disclosed herein is a system for supporting self-closing tongs specially adapted for gripping thin glass sheets (4.5 millimeters and less) during thermal processing, such as that involved during press bending wherein the glass sheets are brought to a sudden start and a sudden stop that promotes swinging of the tongs and its supported glass. The present invention limits the tong swinging so that the glass sheets can be aligned with small tong receiving notches in press bending molds, thereby improving the conformity of press bent glass sheets to their desired shapes.
摘要:
An outline ring-like tempering mold for supporting shaped glass sheets after they are shaped and during the time they are rapidly quenched, comprising a rigid outline metal rail having an outline slightly inward that of the shaped glass sheet and a bar of non-metallic material having a lower heat transfer coefficient than that of the rigid metal rail and mounted on the rigid metal rail in position to conform to the outline and with an upper edge portion of the bar disposed above the upper edge of the rigid metal rail in position to provide a glass sheet supporting surface in spaced relation above the upper edge of the rigid metal rail. The bar is preferably composed of a material having a heat transfer coefficient less than or, at most, approximating that of the glass sheet being treated, an edgewise compressive strength of at least 10,000 psi (4.8 .times. 10.sup.4 Kg/m.sup.2), a flexural strength of 10,000 psi (4.8 .times. 10.sup.4 Kg/m.sup.2) and a minimum shear strength of 10,000 psi (4.8 .times. 10.sup.4 Kg/m.sup.2). When the bar is composed of a laminated structure, such as fiber glass cloth or asbestos woven paper layers or the like bonded together with a silicone resin binder or a phenolic resin binder, for example, the bar preferably has a bond strength of at least 400 pounds (180 Kg). The bar material effectively insulates a supported glass sheet from direct contact with the rigid metal rail and is sufficiently reinforced by said metal rail to provide adequate support for a shaped glass sheet when the latter is quenched.
摘要翻译:一种轮廓环形回火模具,用于在成形后支撑成形玻璃板,并且在其被快速骤冷的时间期间,包括刚性轮廓金属导轨,其具有略微向内的成形玻璃板和非金属材料棒 具有比刚性金属导轨更低的传热系数,并且安装在刚性金属轨道上的位置以符合轮廓,并且杆的上边缘部分设置在刚性金属轨道的上边缘的上方,以提供 在刚性金属导轨的上边缘之上的间隔开的玻璃板支撑表面。 该棒优选由具有小于或最多接近正在处理的玻璃板的传热系数的材料,至少10,000psi(4.8×10 4 Kg / m 2)的沿边抗压强度,弯曲强度 10,000 psi(4.8 x 104 Kg / m2),最小剪切强度为10,000 psi(4.8 x 104 Kg / m2)。 当棒由诸如与硅树脂粘合剂或酚醛树脂粘合剂结合在一起的玻璃纤维布或石棉编织纸层等层压结构构成时,该条优选具有至少400的粘结强度 磅(180公斤)。 钢筋材料有效地使支撑的玻璃板与刚性金属轨道直接接触,并且通过所述金属轨道被充分地增强,以在成形玻璃板淬火时为成形玻璃板提供足够的支撑。
摘要:
The present invention relates to a ring-like member for use in a glass sheet bending and tempering process most adapted to a process wherein a glass sheet is released from engagement against a vacuum mold of a shape having sharply bent regions about longitudinally spaced, transversely extending lines of relatively sharp bending onto said ring-like member. The vacuum mold has a distance between the sharply bent regions at operating conditions that either equals or is slightly less than the distance desired in the bent glass. In a preferred embodiment, the ring-like member is split into two shaping rails, which are separable to adjusted positions wherein the sharply bent regions are spaced to conform to the distance desired therebetween in the bent glass sheet.
摘要:
In tempering a glass sheet, particularly a glass sheet having at least one major dimension more than 0.5 meter, by quenching said sheet with cold tempering medium while at a tempering temperature, prior art tempering apparatus developed insufficient temper particularly in the central portion of the glass sheet, as evidenced by fragments from the central portion exceeding code requirements for maximum size on destruction testing. The present invention provides a novel construction and arrangement of the tempering medium supply system that provides relatively wide escape paths in the direction of the glass sheet thickness for blasts of tempering medium applied toward the central portion of the glass sheet compared to the escape paths provided in said direction for blasts of tempering medium applied to the portion of the glass sheet beyond the central portion. The resulting tempered glass sheets processed using the present invention have fragments that meet code requirements in the central portion as well as the portion beyond the central portion when subjected to destruction testing.
摘要:
When glass sheets are shaped by drop forming a glass sheet released from vacuum engagement against the bottom perforated plate of a vacuum platen to drop onto a shaping mold of ring-like construction, the intermediate portion of the glass sheet can develop excessive downward sag. The present invention discloses different techniques to develop an upward bow in the intermediate portion of the glass sheet sufficient to compensate approximately for the undesired excessive downward sag.
摘要:
Heat softened glass sheets are held by a flat vacuum platen, portions of the glass sheet are pre-shaped by auxiliary shaping means while the glass sheet is being held, and then the glass sheet is dropped onto a shaping mold to impart the complete desired curvature to the glass sheet.