RU2490220C1 - Device for bending sheet glass, - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to production of bent glass to be used as protective glasses for aircraft onboard navigation lights. Proposed device comprises shaped convex mould 2 and hollow female die 3 with forming surface in contact with the edge of glass outline 4 equidistant to mould surface in the area of glass bending allowance. Besides, proposed device comprises guide bushes 5 fitted in symmetry at female die outer surface to displace in guide props 6. Bending mechanism is composed of a frame fitted at bushes and coupled with drive 8 by safety coupling via gear wheel 9 and reduction gear 10.

EFFECT: reduced amount of rejections.

2 dwg

Description

The invention relates to the building materials industry, in particular, to the manufacture of curved glass and can be used in the glass industry to obtain safety glasses for airborne navigation lights (BANO) aircraft. This type of safety glass has a complex curvature of the surface with a variable radius of curvature, as it is part of the surface of the wing or keel of the aircraft.

A device for bending sheet glass containing a profiled convex shape, a bending mechanism comprising a clamping frame made in the form of two profiled plates connected by flexible tapes, and its drive, which is made in the form of a shaft located under the form of a drive connected by flexible bodies with the edges of the clamp frames on auth. testimonial. No. 743955, IPC C03B 23/02, publ. 06/30/1980.

A disadvantage of the known device is that it is impossible to obtain products with a complex surface curvature with a variable radius of curvature due to the appearance of folds on the surface of a bent glass blank on a mold with a complex curvature of the forming surface.

Closest to the invention is a device for bending sheet glass containing a profiled convex shape, a bending mechanism including a clamping frame and its drive, while the clamping frame is made in the form of a hollow matrix having a forming surface in contact with the edge of the glass along its contour and equidistant to mold surface in the field of technological stock of glass according to the application of the Russian Federation No. 201028864/03 (040958) dated 07/12/2010, IPC C03B 23/02.

A disadvantage of the known device is a small percentage of yield. This is because the device does not provide any fixation of the position of the hollow matrix relative to the convex shape. In addition, the device does not have a real bending mechanism, that is, a mechanism for moving a hollow matrix with respect to a convex shape. These circumstances lead to a skew of the matrix relative to the shape and, ultimately, to a large percentage of defective bent glass workpieces.

The objective of the invention is to reduce the percentage of marriage of bent products with complex curvature of the surface with a variable radius of curvature.

To achieve the objective of the invention, a device for bending sheet glass containing a profiled convex shape, a hollow matrix having a forming surface in contact with the edge of the glass along its contour, which is equidistant to the surface of the mold in the area of technological allowance for glass, the bending mechanism and its drive, characterized in that the device further comprises guide bushings mounted on the outer surface of the matrix symmetrically to one another with the ability to move along the guide racks, and the bending mechanism is made in the form of a frame mounted on the bushings and connected to the drive by a safety clutch through a gear and gearbox.

Guide sleeves mounted on the outer surface of the hollow matrix symmetrically to one another with the ability to move along the guide racks, provide a constant fixation of the position of the hollow matrix relative to the convex shape throughout the glass bending process. The implementation of the bending mechanism in the form of a frame mounted on bushings and connected to the drive by a safety clutch through a gear and a reducer, ensures the glass is bent to a given curvature of the conveying shape of the forming surface and the glass bending process is terminated in a timely manner. This is explained by the fact that at the final stage of glass bending, the safety clutch begins to turn, which is a signal that the glass bending process is complete. At the moment of the appearance of the above signal, the heating furnace and the device in question are automatically de-energized.

In Fig.1 - the initial position of the glass and hollow matrix.

Figure 2 - the final position of the glass and hollow matrix.

The device comprises a heating furnace 1 and a profiled convex shape 2 located therein, a hollow matrix 3 in contact with the edge of the glass blank 4 along its contour. Guide sleeves 5, mounted on the outer surface of the hollow matrix 3 symmetrically to one another, are able to move along the guide posts 6. The bending mechanism includes a frame 7 mounted on the sleeves 5 and connected to the drive 8 by a safety clutch (not shown in FIGS. 1, 2 ) through the gear 9 and gear 10. In this case, the drive 8, the safety clutch and gear 10 are installed outside the working space of the heating furnace 1.

The device operates as follows.

The glass blank 4 is placed on the mold 2, fixing its position using the hollow matrix 3. After heating the furnace 1 to the glass softening temperature, the drive 8 is turned on, which drives the guide bushings 5 along the guide posts 6 through the gearbox 10 and gear 9 through the frame 7 this hollow matrix 3 exerts a constant bending force on the glass workpiece 4 along the edge along its entire contour. After completion of the bending process, when the glass workpiece 4 receives the specified curvature of the surface of the convex shape 2, the safety clutch of the actuator 8 begins to turn. At the indicated time, the control device (not shown in FIGS. 1, 2) de-energizes the heating furnace 1 and drive 8. After inertial cooling of the furnace 1 to a temperature of 40-50 ° C, the matrix 3 is raised using drive 8 and set to its initial position (FIG. .one). The bent glass workpiece 4 is transferred to the cold processing section of the glass to obtain the product.

The percentage of suitable products used in BANO obtained using the proposed device was 91%. The percentage of suitable products used in the BANO obtained using the prototype device was 54%.

Information sources

1. Copyright certificate No. 743955, IPC C03B 23/02, publ. 06/30/1980.

2. The application of the Russian Federation No.2010128864 / 03 (040958) dated 07/12/2010, IPC C03B 23/02, - the prototype.

Claims (1)

A device for bending sheet glass containing a profiled convex shape, a hollow matrix having a forming surface in contact with the edge of the glass along its contour, equidistant to the surface of the mold in the area of technological allowance for glass, the bending mechanism and its drive, characterized in that the device further comprises guides bushings mounted on the outer surface of the matrix symmetrically to one another with the ability to move along the guide racks, and the bending mechanism is made in the form of a frame, it is installed mounted on the bushings and connected to the drive by a safety clutch through a gear and gearbox.

Images