JPH0441146Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an apparatus for forming curved glass such as an automobile window glass.

(Prior Art) A device shown in FIGS. 5 and 6 is known as Japanese Patent Publication No. 12931/1984 as an apparatus for horizontally bending plate glass heated to near its softening point in a heating furnace.

That is, the plate glass G conveyed horizontally from the heating furnace is received by the press roll 100, and then the lower mold 101 is raised to receive the plate glass G on the press roll 100 onto the lower mold 101, and this plate glass G is Ring mold 1
At 02, the parts other than the peripheral edge of the plate glass G are weighed by their own weight,
It is bent into a predetermined shape by inertia force or by pressing with the upper die 103.

(Problems to be solved by the invention) In the conventional molding apparatus described above, the lower mold 10
1 is raised so that the plate glass G on the press roll 100 is received on the lower mold 101. Therefore, when the lower mold 101 is raised, the lower mold 100 is raised so that the press roll 100 and the lower mold 101 do not interfere with each other. A recess 104 is formed in the width direction of the mold 101, and the press roll 101 is accommodated within this recess 104.

However, since the concave portion 104 is formed, the peripheral edge of the lower die 101 becomes discontinuous, and this discontinuous portion may cause optical distortion called a highlight in the glass sheet after molding.

Therefore, an idea is to shorten the length of the press roll so that the recess 104 that accommodates the press roll does not extend to the periphery of the lower mold 101, and to make the periphery of the upper surface of the lower mold 101 one continuous molding surface. It will be done. However, in this case, both ends of the press roll 100 come into contact with a central portion of the glass plate G, and there is a possibility that distortion may occur in the glass plate at this contact portion.

(Means for Solving the Problems) In order to solve the above problems, the present invention makes the length of the press roll shorter than the length in the width direction of the mold (lower mold), and the press roll formed in the mold. The ends of the recess for storage were made so as not to touch the peripheral edge of the upper surface of the mold, and both ends of the press roll were tapered.

(Function) Since both ends of the press roll are tapered, both ends of the press roll do not come into contact with the plate glass at an acute angle.

(Example) An example of the present invention will be described below based on the accompanying drawings.

Figure 1 is a plan view of the molding device according to the present invention, Figure 2
The figure is a longitudinal sectional view of the molding apparatus, and in this embodiment, the mold 1 is a concave mold, and together with a convex upper mold, the plate glass is press-molded.

The mold 1 has a hollow shape, and a large number of cooling air blowing holes 2 are formed in the upper surface, which is the molding surface. Furthermore, recesses 3 are formed in the mold 1 so as not to cover the peripheral edge 1a of the upper surface. The longitudinal direction of this recess 3 is perpendicular to the conveying direction of the plate glass, and a press roll 4 whose axis is also perpendicular to the conveying direction of the plate glass is accommodated in the recess 3. This press roll 4 is connected to a frame 5 provided below the mold 1 as shown in FIG.
This frame 5 is raised and lowered by a cylinder unit (not shown). By the operation of the cylinder unit, the press roll 4 protrudes above the upper surface of the mold 1 and is housed in the recess 3 as shown in FIG.

Further, the upper surface 1b of the mold 1 between the recesses 3 and 3 is also used as a molding surface, and has cooling air blowing holes 2 formed therein. Thus, the peripheral edge 1a and the upper surface 1b of the mold 1
becomes one continuous molding surface.

On the other hand, a ring mold 6 for forming the peripheral portion of the sheet glass is provided around the forming die 1. The ring mold 6 is in contact with the forming die 1 during forming.
and after molding, it rises relatively higher than the upper surface of the mold 1.

FIG. 3 is an enlarged view of the end of the press roll 4, and the end 4a of the press roll 4 has a tapered shape. This is because in the present invention, the entire circumference of the peripheral edge 1a of the mold 1 is used as the molding surface, so the press roll 4 is shortened, and as a result, the end of the press roll 4 comes into contact with the central part of the glass plate G. As a result, there is a risk that distortion may occur in the central portion of the glass plate G that has been transported, and in order to avoid this, the glass plate G is tapered. A suitable taper angle for avoiding distortion is about 5°.

A molding method using the mold as described above will be described below.

First, before molding, the press roll 4 protrudes from the upper surface of the mold 1 and is flush with the conveyance roll. From this state, the plate glass G heated to near its softening point is transferred to a press roll 4 via a conveyor roll.
It will be transported to.

Next, the glass plate G on the press roll 4 is transferred onto the ring mold 6 by either raising the mold 1 or lowering the press roll 4, or by both of these operations. Then, due to its own weight or inertial force when the mold 1 rises, the plate glass G is moved by the ring mold 6 and the molding surfaces 1a and 1b of the mold 1.
The lower surface of the upper surface 7, the ring mold 6, and the mold 1 are bent as shown in FIG.
It is press-molded between the molding surfaces 1a and 1b.

After this, the upper mold 7 rises and the ring mold 6 remains as it is, and the mold 1 lowers to support the formed sheet glass G on the ring mold 6 between the molds 1 of the upper mold 7. In this state, oscillation is performed. By operating the device, the ring mold 6 is rotated back and forth, left and right, or within a horizontal plane, and the upper mold 7 is placed on the surface of the plate glass G.
Cooling air is evenly blown from the cooling air blowing holes 2 of the mold 1 to rapidly cool and strengthen the plate glass G.

In the examples, the mold is shown as a lower mold that press-forms the plate glass between the mold and the upper mold, but it may be a mold that molds the glass plate by its own weight without using the upper mold.

(Effect of the invention) As explained above, according to the invention, by making the press roll shorter than the width of the mold, the press roll storage recess formed in the mold can be prevented from touching the peripheral edge of the mold. In addition, since both ends of the press roll are tapered, optical distortion such as highlights will not occur at the periphery of the glass plate, and furthermore, there will be no distortion in the center of the glass plate due to contact with the press roll. Never occurs.

[Brief explanation of the drawing]

Figure 1 is a plan view of the molding device according to the present invention, Figure 2
3 is a diagram showing another embodiment of the press roll, FIG. 4 is a front view of the molding device during molding, and FIG. 5 is a front view of the conventional molding device.
FIG. 6 is a plan view of essential parts of a conventional molding device. In the drawings, 1 is a mold, 1a is the upper peripheral edge of the mold, 3 is a recess, 4 is a press roll, 4a is an end of the press roll, 6 is a ring mold, 7 is an upper mold, and G is a plate glass. .

Claims (1)

[Scope of utility model registration request] A forming apparatus comprising a press roll that receives a plate glass conveyed in a horizontal state from a heating furnace, and a forming die that receives the plate glass from the press roll and bends and forms the plate glass using its own weight or between the upper die. A press roll storage recess is formed in the plate glass, the recess is opened so as not to cover the peripheral edge of the upper surface of the mold, and both ends of the press roll are tapered. Molding equipment.