JPH06412Y2 - Bending machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a device for bending a plate-like body such as ceramic or glass in a thermoplastic state, and these bent plate-like bodies are used for building construction materials. It is used in various fields as a starting point.

[Prior art and its problems]

It is known that a curved plate is obtained by placing a ceramic or glass, for example, a glass ceramic plate on a mold, softening it by heating and softening it by its own weight along the curved surface of the mold (for example, JP-A-50-46722). However, it takes an extremely long time to obtain a bent plate with a small radius of curvature, while on the other hand, when it is desired to increase the softening property at a higher temperature and to obtain a bent plate with a smaller radius of curvature in a shorter time, the fluidity increases. There are many problems such as it is difficult to fix the original shape, the peelability from the mold is deteriorated and the uniformity of the plate thickness is impaired.

The present invention provides a novel bending apparatus that solves these problems.

[Means for solving problems]

The present invention relates to a bending apparatus in which a load roll is pressed and run in the length direction of a plate-like body in a thermoplastic state to bend the first arm, one end of which is axially supported by a support, and the tip of the first arm. 2nd arms whose one ends are rotatably supported, are opposed to each other, and a load roll extending between the tips of the respective second arms is hung, and these arms are rotated by at least one of the first arm and the second arm. A wire rod that can be hung and suspended is hung so that it can be drawn out and pulled back freely.

〔Example〕

 Hereinafter, the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a schematic side view of the present invention, in which 1'is a ceiling wall of a furnace 1, and a pair of support members 1 "for rotatably supporting one end of a first arm 2 are attached so as to face each other. One end of the second arm 3 is rotatably supported at the tip of the facing first arm 2, and the load rolls 4 and 5 of, for example, about 10 kg are mounted between the tips of the second arm 3. The load roll may be one large-diameter high-load roll or the load may be distributed to a plurality of rolls.

Reference numeral 6 is a curved type, and a plate-shaped body 7 to be bent, for example, a glass-ceramic plate is placed and then housed in the furnace 1.

These members are made of a heat resistant metal such as SUS.

Numerals 8 and 9 are heat resistant wires for suspending and supporting the first arm and the second arm, for example, SUS wires, and the widths of the first arm 2 and the second arm 3 are set so that they can be drawn out and pulled back freely on the drums 10 and 11.
By rotating the respective tips, it is possible to form a desired traveling locus on the load roll 4 or 5 at the tip of the second arm 3.

Reference numerals 12 and 13 denote tip portions of the detection switches of the first arm 2 and the second arm 3, respectively, and switch the first arm 2 and the second arm 3 to the switch 1
If the curved die 6 is brought into contact with 2 and 13, they will not come into contact with each other or be damaged, or the ceiling 1'of the furnace will be damaged while the arms 2 and 3 are rotated. Absent.

The plate-like body 7 and the bending die 6 carried into the furnace 1 are heated to soften the plate-like body 7 and gradually bend by its own weight along the curved surface of the bending die 6.

However, it takes a long time to obtain a desired curvature, and this tendency is remarkable when trying to obtain a small radius of curvature of R ≦ 400 mm, and if it is achieved in a short time, it must be heated to a higher temperature. However, as described above, the fluidity increases, which makes the plate thickness non-uniform and the peelability from the mold becomes difficult.

In the present invention, when the plate-like body 7 is softening and curving, the drum 10 is normally and reversely rotated to feed out the heat resistant wire 8 and is pulled back to rotate the first arm 2, while the drum 11 is normally and reversely rotated to feed out the heat resistant wire 9. By pulling back, the second arm 3 is rotated, so that the load roll 4 forms a locus of constant curvature parallel to the surface of the bending die 6. As a result, the plate-shaped body 7 is forcibly curved along the curved die surface 6 and can be formed into a plate-shaped body having a desired curvature. After that, the plate-shaped body 7 and the bending die 6 are fed into an adjacent annealing furnace and cooled to complete bending.

FIG. 1 shows an example of traveling the load roll 4 while keeping the angle α formed by the first arm 2 and the second arm 3 constant. In this case, the traveling locus is the axis of the support member 1 ″ and the load roll 4. The radius is the distance from the tip of the outer circumference.The drums 10 and 11 may be rotated manually, but preferably the NC can be operated very accurately by the NC control in which the traveling locus is programmed in advance.

The length ratio of the first arm 2 and the second arm 3 is not specified, but the length of the first arm 2 is set longer than that of the second arm 3
Has a wider range of correspondence to various curvatures when it is taken short so that it can turn a little. The width between the opposing arms is made wider than the lateral width of the mold 6 in order to avoid contact with the curved mold 6.

FIG. 1 shows an example in the case of obtaining a concave curved plate, whereas FIG. 2 is a side view schematic diagram in the case of obtaining a convex curved plate, which is operated in the same manner as the previous embodiment. Thus, the bent plate can be easily obtained.

It will be easily understood that the load rolls 5 and 4 are alternately operated in this embodiment. In such a mode, the angle between the first arm and the second arm as shown in FIG. 1 is changed at any time without being kept constant, and the load roll 5 initially pushes and then the load roll 4 pushes and shifts. Thereby, the curved surface can be efficiently formed.

FIG. 3 is a schematic side view showing that the supporting member 1 ″ is on the side wall portion. Instead of the bending die 6, a supporting body 6 ′ and a metal plate 6 ″ having appropriate rigidity and flexibility are used. It can be bent to a desired curvature by operating the load roll.

In addition, according to the present invention, not only a circular arc but also an elliptical curve or other arbitrary curve is possible.

[Effect of device]

According to the present invention, the plate-like body can be bent quickly, easily and accurately, and it is particularly suitable for obtaining a bent plate having a small radius of curvature.

[Brief description of drawings]

 1 to 3 are side views of the present invention. 1 ″ ... Support member 2 ... First arm 3 ... Second arm 4, 5 ... Load roll

Claims (1)

[Scope of utility model registration request] 1. A bending apparatus in which a load roll is pressed to run in a length direction of a plate-like body in a thermoplastic state to bend the plate-like body, a first arm having one end axially supported by a support, and the first arm. A pair of second arms each having one end rotatably supported at the tip end thereof is provided to face each other, and a load roll extending between the tip ends of the respective second arms is hung, and at least one of the first arm and the second arm, A bending apparatus characterized in that wire rods for rotatably suspending these arms are hung so as to be drawn out and pulled back.