JPH0532507Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is for press-molding glass products that have no seams on the product body and have protrusions such as knobs, screws, and engravings in the center. This relates to a mold for molding.

(Prior art) In order to press-form a glass product with a knob in the center, such as a glass pot lid, using an indivisible mold that does not create a seam on the body of the product, it is necessary to
It is necessary to incorporate a split mold for knob forming into the center of the bottom of the indivisible body mold. FIG. 4 shows a conventional mold for this purpose, in which a split mold 23 for knob forming that can be opened horizontally together with the holder 22 is incorporated into the holder 22 of an indivisible body mold 21. This molds a seamless body of the product, and the split mold 23 molds a knob.

However, such conventional molds require a certain thickness or more at the center of the body mold 21 in order to avoid burning (overheating) in the center of the body mold 21, and for this reason, the fourth mold
As shown in the figure, a pedestal corresponding to the thickness of the body mold 21 is inevitably formed between the surface of the lid formed by the body mold 21 and the knob formed by the split mold 23. For this reason, it was impossible to mold glass products such as pot lids with knobs without bases.

In addition, such a conventional mold has a pedestal molding hole 24.
Since it is necessary to pull the product upward through the split mold 2
3, the maximum diameter of the knob must be smaller than the inner diameter of the pedestal molding hole 24, which poses a problem in terms of design.

(Problems to be solved by the invention) The present invention solves the above-mentioned conventional problems and provides a method for forming glass products as described above, which can greatly increase the degree of freedom in the shape of protrusions such as knobs. It was completed to provide molds.

(Means for solving the problem) The present invention, which was made to solve the problems described above, is characterized by forming a tapered guide surface that opens upward in the center of the bottom of an undivided body mold, providing inside it a split bottom mold that can expand radially along this guide surface, and providing a core rod in the center of these bottom molds with a bottom mold raising and lowering function.

(Example) Next, an example of the present invention will be described in detail with reference to FIGS. 1, 2, and 3.

Reference numeral 1 denotes an indivisible body mold for molding the body of the product, and a tapered guide surface 2 with an open upper part is formed at the center of its bottom. 3 is a three-part bottom mold provided inside this guide surface 2.
Each bottom mold 3 has a guide pin 4 on its outer surface, and by loosely fitting a bush 5 with a flange fitted onto the guide pin 4 into a vertically long hole 6 of the body mold 1, the guide pin 4 is inserted into the guide pin 4 radially along the guide surface 2. It has an expandable structure. As shown in Fig. 1, the upper surface of each bottom mold 3 becomes a molding surface 7 that is continuous with the inner surface of the body mold 1 during molding, and the inner surface of each bottom mold 3 is provided with protrusions such as knobs. A recess 8 for molding is formed.

9 is a core rod provided at the center of each bottom mold 3.
This core rod 9 can be moved up and down, for example, a distance of about 10 to 20 mm using an appropriate lifting mechanism such as a cylinder, and the upper end surface of a member 10 detachably attached to the upper end of the core rod 9 is a protrusion of the product. It serves as a molding surface 11 for molding the end face of the. In addition, a tapered pressing part is formed on the upper part of the core rod 9 so that it comes into contact with the lower surface 12 of each bottom mold 3, and when the core rod 9 moves up and down, it is pushed by this part and each bottom mold 3 also goes up and down at the same time. The structure is such that

In addition, in FIG. 1, 13 is a plunger for pressing, and 14 is an eye die that interlocks with this plunger.

(Function) In the mold for molding glass products of the present invention constructed in this way, as shown in FIG. The gob is put in the same state and press forming is performed by the plunger 13. At this time, a seamless body of the product is formed by the indivisible body mold 1, and protrusions such as knobs are integrally press-molded by the molding surfaces 11 at the upper ends of the bottom molds 3 and the core rod 9.

Thereafter, as shown in FIG. 2, when the core rod 9 is raised relative to the body mold 1, the molding surface 11
At the same time as the product is pushed up, each bottom mold 3 is also pushed up by the core rod 9, but as described above, each bottom mold 3 is restrained to move up and down along the tapered guide surface 2 of the body mold 1. Because there are 3 bottom molds for each
As it rises, it opens outward and radially. As a result, each bottom mold 3 is released radially from the molded protrusion, and at the same time the molded product is pushed up by the molding surface 11 at the upper end of the core rod 9 and the upper surface of each bottom mold 3, It rises slightly from body type 1. Therefore, the product can be lifted vertically upward using a suitable take-out means such as a vacuum head and taken out onto the conveyor.

(Effects of the invention) Since the mold for molding glass products of the present invention is configured as described above, it has the following advantages compared to the conventional mold for molding glass products shown in Fig. 4. It is something that you have.

First, the present invention has a structure in which the entire protrusion of the product is molded by the bottom die 3, and the joint between the bottom die 3 and the body die 1 is located away from the protrusion of the product. A pedestal is not inevitably formed between the surface of the lid and the knob formed by the bottom mold 3 as in the conventional case. Therefore, flat glass products such as pot lids with knobs without pedestals can be molded freely, and since the body mold 1 can be made sufficiently thick, mold burn can be prevented. can.

Secondly, in this invention, the split mold 3 opens radially from the molded protrusion, so even if the diameter of the tip of the protrusion is larger than the diameter of the base of the protrusion, there is no problem in taking out the product. This allows for a great deal of freedom in the design of the product that can be molded.

Thirdly, in the present invention, the molded product is lifted from the body mold 1 when the mold is opened, so that the product can be taken out accurately.

Fourthly, since the mold for molding glass products of the present invention only requires raising and lowering the core rod 9, the structure for opening the mold is simpler than that of the mold shown in FIG.

Therefore, the present invention solves the problems of conventional molds for molding glass products of this type, and its practical value is extremely great.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of the present invention, Fig. 2 is a sectional view showing the state in which the core rod is raised, Fig. 3 is a plan view of Fig. 1, and Fig. 4 is a conventional glass product forming method. It is a sectional view showing a typical example of a mold for use. 1... Trunk mold, 2... Guide surface, 3... Bottom mold, 9
... Core rod.

Claims (1)

[Scope of utility model registration request] A tapered guide surface 2 that is open at the top is formed at the center of the bottom of an indivisible body mold 1, and a split bottom mold 3 that can be expanded radially along the guide surface 2 is provided inside the guide surface 2. A mold for molding glass products characterized in that a core rod 9 having a function of raising and lowering the bottom mold is provided at the center of the bottom mold 3.