JPH0549611B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a press mold, and more particularly, to a press mold that can form a pressed glass product with good concentricity and no burrs.

[Background of the invention]

Conventionally, when molding glass press products, for example, as shown in Japanese Patent Application Laid-open No. 51-60208,
After supplying the softened glass heated to a temperature higher than that required for molding into the lower mold, the upper mold is lowered, and this upper mold is placed into the body mold into which the lower mold is slidably assembled. Pressure was applied and press molding was performed.

However, the press mold configured in this way,
There were problems that needed further improvement in the following points.

(1) In order to reliably insert the upper mold into the body mold each time press forming is performed, the axes of the upper mold and lower mold must be aligned with high precision. In addition, it was not easy to align the upper and lower molds because it required a press with sufficient rigidity to prevent the axis from being shifted due to the load and heat deformation during press molding. .

(2) Since the gap between the upper mold and the body mold cannot be made small, the misalignment of the upper and lower surfaces with respect to the outer diameter of the glass press product is large, making it impossible to obtain a molded product with good concentricity.

(3) Because the gap between the upper and lower dies and the body dies is large,
Glass easily entered the gap, and therefore "burrs" were likely to occur on glass pressed products.

[Purpose of the invention]

The present invention was made in order to solve the problems of the above-mentioned conventional technology.The present invention has been made in order to solve the problems of the above-mentioned conventional technology. The purpose is to provide a press die that does not require alignment.

Another object of the present invention is to provide a press mold in which a vacuum suction method can be applied to take out glass pressed products, and automation of material supply and molded product removal processes can be realized.

[Summary of the invention]

The press mold according to the present invention has an upper mold and a lower mold that form a cavity having almost the same shape as the finished glass press product when the mold is closed, a softened glass supply port, and a glass press product outlet. by supplying softened glass heated to a softening temperature higher than that required for molding to the lower mold, and lowering the upper mold to pressurize the softened glass, In a press mold capable of press-molding a glass press product, the upper mold and the lower mold have the same outer diameter size, and the upper mold and the lower mold are slid within the same inner peripheral surface of the body mold. The glass press product outlet provided on the side surface of the body mold is an opening large enough to allow the glass press product and the vacuum suction part of the means for taking out the glass press product to enter and exit.

[Embodiments of the invention]

Conventional press molds are configured so that the upper mold is inserted into the body mold during press molding, so it is necessary to center the upper and lower molds, and there is also a gap between the outer diameter of the upper mold and the inner diameter of the body mold. It was necessary to make it larger.

In contrast, the present invention is configured such that the upper mold is assembled into the body mold from the beginning, thereby eliminating the need for centering the upper and lower molds.

The present invention will be explained below with reference to an example in which a glass lens related to a glass press product is press-molded.

FIG. 1 is a longitudinal sectional view showing a press mold according to an embodiment of the present invention, FIG. 2 is a longitudinal sectional view of the body mold in FIG. 1, and FIG. 4 is a side view of the mold, FIG. 4 is a sectional view taken from the side shown in FIG. 2, FIG. FIG. 2 is a longitudinal cross-sectional view showing a state in which a glassless lens is taken out from a press mold according to the present invention.

To explain the outline of this press mold using drawings, it has an upper mold 6, a lower mold 5, and a body mold 1, which form a gap having almost the same shape as the finished glass lens when the mold is closed. The glass lens 7 is molded by supplying the softened glass 2 heated to a softening temperature higher than that required for molding into the lower mold 5, and lowering the upper mold 6 to pressurize the softened glass 2. A softened glass supply port 1a and a glass press product outlet 1b are bored in the side surface of the body mold 1, and the inner diameter dimension of the body mold 1 is set within the same inner peripheral surface of the body mold 1. This is a press mold in which an upper die 6 and a lower die 5 having the same outer diameter and almost zero gap are slidably assembled.

To explain in detail, 1 is a cylindrical body, and a rectangular softened glass supply port 1a and a glass press product outlet 1b opposite thereto are bored in the side surface of the body 1. has been done. The width of this glass press product outlet 1b (same shape as the softened glass supply port 1a) is made slightly larger than the inner diameter of the body mold 1 in order to enable the molded product to be taken out from the lower mold 5, which will be described later. ing. More specifically, the glass press product outlet 1b is an opening large enough to allow the glass lens 7 and a suction section 8a of a molded product removal device 8, which will be described later, to enter and exit. The body mold 1 is fixed to a mold holder 11 by bolts 9 inserted into mounting holes 10.

6 is an upper mold that is attached to a ram (not shown) of the press and slides vertically within the body mold 1;
This is a lower die that slides vertically within the body die 1 and has an embossing rod 5a that passes through the through hole 1c of the body die 1 and is connected to a hydraulic press (not shown). and,
The outer diameter of the upper die 6 and lower die 5 with the same outer diameter dimensions and the body die 1
The gap with the inner diameter of the glass lens is almost zero, and when the mold is closed, there is a gap that allows the glass lens to be formed into almost the same shape as the finished product.

3 is a chute disposed horizontally facing the softened glass supply port 1a of the body mold 1, and 4 is a softened glass 2
A material supply device 8 rolls the material on this chute 3 and supplies it into the lower mold 5, and 8 is a glass press product outlet 1.
The operation of the press die configured in this manner is a molded product ejecting device that is disposed on the b side so as to be able to reciprocate in the horizontal direction, is connected to a vacuum pump (not shown), and has a suction section 8a. explain.

A softened glass 2 having a predetermined refractive index, up number, and weight that has been softened by heating in a heating furnace (not shown) is pushed by a material supply device 4 that advances in the direction of the arrow on a chute 3 and rolls into a cylinder. It falls from the softened glass supply port 1a of the mold 1 and is supplied to the lower mold 5.
After that, the material supply device 4 retreats. The upper mold 6 is lowered within the body mold 1 by the ram, passes through the converted glass supply port 1a, and the softened glass 2 is pressurized by the upper mold 6 and the lower mold 5, and the mold is closed. The glass lens 7 is then molded into the upper and lower molds.
After the upper die 6 is raised to a predetermined position above the glass pressed article outlet 1b by the ram, the molded article extractor 8 moves forward in the direction of the arrow (FIG. 5).
It stops at the position where the suction part 8a is above the lower mold 5. The lower die 5 is pushed up by the hydraulic press via the embossing rod 5a until the glass lens 7 comes into light contact with the suction part 8a. When the vacuum pump operates and the glass lens 7 is sucked into the suction part 8a, the lower mold 5 descends, and the glass lens 7
It is released from the mold. The molded product take-out device 8 retreats,
When the glass lens 7 is transferred to a molded product storage location (not shown), the vacuum pump is stopped and the glass lens 7 is stored in the molded product storage location. Thereafter, this operation is continuously repeated to obtain a predetermined number of desired glass lenses 7.

According to the embodiment described above, since the upper mold 6 is assembled in the body mold 1 in advance, there is no need to align the upper and lower molds, and the outer diameters of the upper and lower molds and the inner diameter of the body mold do not need to be aligned. Since the gap can be reduced to almost zero, it is possible to press-form a glass lens 7 with no misalignment, extremely good concentricity, and no burrs without using a particularly rigid press. effective. In addition, since no burrs are generated, the glass lens 7 can be easily taken out by the molded product removal device 8 without being caught on the body mold 1 or the lower mold 5, and no burrs remain in the mold. Furthermore, there is an advantage that there is no need to deburr the glass lens 7.

Further, according to this embodiment, the softened glass supply port 1
At a, the softened glass 2 is supplied through the chute 3, and at the glass press product outlet 1b, the glass lens 7 can be sucked and taken out through the suction part 8a of the molded product take-out device 8 connected to a vacuum pump. It is possible to automate these material supply and molded product removal processes.

In this example, the shapes of the softened glass supply port 1a and the pressed glass product outlet 1b are rectangular, but the shapes are not limited to rectangles.
The softened glass supply port is large enough to supply the softened glass 2 into the lower mold 5, and the glass lens product outlet is large enough to allow the glass lens 7 to be taken out from there. For example, it may be an oval hole.

Furthermore, in this embodiment, the softened glass supply port 1a and the glass pressed product outlet 1b are bored in the body mold 1, but only one opening is bored, and that opening is connected to the softened glass supply port and the glass press product outlet 1b. It may also be shared with the pressed product outlet.

Furthermore, although this embodiment describes the case where the glass lens 7 is press-molded, the present invention is not limited to press-molding of glass lenses. By setting the shape of the void to a desired shape, it can be used to mold ultra-precision glass pressed products of arbitrary shapes with excellent concentricity.

〔Effect of the invention〕

As explained in detail above, according to the present invention,
It is possible to provide a press mold that does not require centering of upper and lower molds, which enables continuous molding of glass pressed products with good concentricity and no burrs.

Further, according to the present invention, it is possible to provide a press mold in which a vacuum suction method can be applied to take out a glass pressed product, and automation of material supply and molded product takeout processes can be realized.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing a press mold according to an embodiment of the present invention, FIG. 2 is a longitudinal sectional view of the body mold in FIG. 1, and FIG. 4 is a side view of the mold, FIG. 4 is a sectional view taken from the side shown in FIG. 2, FIG. FIG. 3 is a longitudinal cross-sectional view showing a state in which a glass lens is taken out from a press mold according to the present invention. 1... Trunk type, 1a... Softened glass supply port, 1b
...Glass pressed product outlet, 2...Softened glass,
5...Lower mold, 6...Upper mold, 7...Glass lens.

Claims (1)

[Scope of Claims] 1. An upper mold and a lower mold that, when the molds are closed, form a cavity having almost the same shape as the finished glass press product;
A body mold is provided with a softened glass supply port and a glass press product outlet on the side, and the softened glass heated to a softening temperature higher than that required for molding is supplied to the lower mold, and the upper mold is lowered. In a press mold capable of press-molding a glass press product by pressurizing the softened glass, the upper mold and the lower mold have the same outer diameter, and the body mold has the same inner circumferential surface. The upper mold and the lower mold are slidably assembled in the body mold, and a glass pressed product outlet provided on the side surface of the body mold is used to allow the glass pressed product and a vacuum suction part of a means for taking out the glass pressed product to be inserted into and exited from the glass pressed product. A press mold characterized by a large opening.