JPH11147722A - Molding apparatus for glass bottle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a molding apparatus for a glass bottle capable of suppressing the generation of defect such as 'a loose part', 'a kinky part' or 'a chip off of the glass' in a parison. SOLUTION: This molding apparatus for a glass bottle has a plunger 4 constituted so as to penetrate the opening parts of a mouth mold 2 installed in the lower part of a roughcast 1 and a guide ring 3 in the vertical direction and be freely lifted and lowered, and an inner sleeve 9 constituted so as to be urged upward by an urging means and enable the centering of the plunger to the guide ring 3 when the plunger 4 is lifted, and the mouth part of the parison 21 is enabled to be formed among the mouth mold 2, the guide ring 3 and the plunger 4. The guide ring 4 is constituted so as to be pressed to the mouth mold 2 by the inner sleeve 9 to fit the mouth mold 2 to the guide ring 4 when forming the mouth part of the parison 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glass bottle forming apparatus having a rough mold used for forming a glass bottle by a press and blow method.

[0002]

2. Description of the Related Art In general, when a glass bottle is formed by a press-and-blow method, it is general that a parison is roughly formed by a press and then subjected to a blow mold (blowing of compressed air) to a finish mold. When a parison is formed by using a rough mold, as shown in FIG. 6, first, a gob G is put into the rough mold 31, and then the upper part of the rough mold 31 is covered with a baffle (not shown). For example, an air cylinder (not shown)
The plunger 33 is raised by the drive to press the gob G, and the gob G is brought into close contact with the rough mold 31, the baffle (not shown), the mouth mold 35, and the guide ring 37, and includes the mouth 39a. The parison 39 is formed at the same time.

[0003]

However, in the conventional press-and-blow method, a slight gap δ is always formed between the die 35 and the guide ring 37 due to the mechanism.

When the glass temperature rises, the die 35 is deformed by heat, so that the gap δ between the die 35 and the guide ring 37 further increases. In the final step of pressing by the plunger 33, the gap δ The glass starts to bite through the opening, so that the opening 39a of the parison 39 tends to have a frayed or frayed shape in the shape of a celestial bite. is there.

Accordingly, an object of the present invention is to solve the above-mentioned conventional problems and to substantially suppress the occurrence of defects such as "fraying", "chatter" or "chip of glass" in a parison. Is to provide.

[0006]

According to a first aspect of the present invention, there is provided a plunger which is vertically movable through an opening of a mouth mold and a guide ring provided at a lower portion of a rough mold, and a plunger which is vertically movable. An inner sleeve configured to be biased upward by a biasing means at the time of ascent and to allow the plunger to be centered with respect to the guide ring; and a mouth of the parison between the mouth mold and the guide ring and the plunger. In a glass bottle forming apparatus capable of forming a portion, the guide ring can be pressed toward the mouth mold by the inner sleeve so that the mouth mold and the guide ring are brought into close contact with each other when the mouth portion of the parison is formed. It is characterized by having comprised.

In the present invention, since the guide ring is pressed toward the mouth mold by the inner sleeve when the mouth portion of the parison is formed, the mouth mold and the guide ring come into close contact with each other. Therefore, even if the temperature of the glass increases and the mouth mold is thermally deformed, there is almost no gap between the mouth mold and the guide ring, so that the glass starts to bite through this gap in almost the final step of pressing by the plunger. Will not be.

[0008] Accordingly, the occurrence of defects such as "fraying", "chatter" or "chipping of glass" at the mouth of the parison is likewise suppressed.

[0009]

An embodiment of the present invention will be described below with reference to the drawings.

When a glass bottle is formed by a press-and-blow method, a parison is roughly formed by a press, followed by finish molding by a blow. FIG. 1 shows an apparatus structure for roughly molding a parison by pressing. Reference numeral 1 denotes a rough mold, and a mouth mold 2 and a guide ring 3 are provided below the rough mold 1. Reference numeral 4 denotes a plunger.

A plunger adapter 7 is connected to a lower end 4 a of the plunger 4 via a split ring 6. A cylinder rod 8 of an air cylinder (not shown) is connected to the plunger adapter 7, and the plunger 4 moves the opening 2 a, 2 of the die 2 and the guide ring 3 according to the expansion and contraction operation of the cylinder rod 8. 3a so that it can penetrate vertically and enter the inner part of the rough mold 1, that is, can move up and down.

A positioner / inner sleeve 9 is fitted around the lower end 4a of the plunger 4. The positioner / inner sleeve 9 is biased upward via a coil spring (biasing means) 10, and when the plunger 4 is raised, the upper end 9 a of the positioner / inner sleeve 9 is fitted to the step 3 b of the guide ring 3. Thus, the center of the plunger 4 with respect to the guide ring 3 can be set.

Next, the operation will be described.

When a parison is formed by using the rough mold 1, the plunger 4 is first raised to the go-broding position as shown in FIG. In this case, the positioner
The inner sleeve 9 is biased upward in advance by the spring force of the coil spring 10, and the upper end 9 a of the positioner / inner sleeve 9 is fitted to the step 3 b of the guide ring 3. Therefore, when the plunger 4 moves up to the go-broding position, the plunger 4 is moved by the positioner inner sleeve 9 to the guide ring 3.
Rises while being centered against.

At the stage when the plunger 4 is raised to the go-broding position, the gob G is put into the rough mold 1, and the upper part of the rough mold 1 is covered with a baffle 5, and then, as shown in FIG. The plunger 4 is raised by the driving of the plunger 4 to press the gob G, whereby the gob G
The parison 21 including the mouth 21a is simultaneously formed by closely adhering to the rough mold 1, the baffle 5, the mouth mold 2, and the guide ring 3.

In the press step during the parison molding, as shown in FIG. 4, a thrust F0 of the air cylinder acts on the gob G, and a guide ring pressing force F acts on the guide ring 3 as a reaction. If this state is left as in the prior art, the guide ring depressing force F greatly widens the gap between the mouth mold 2 and the guide ring 3, and the glass starts to bite out of this gap, resulting in “fraying” and “fraying” in the parison. Or "glass chipping".

In order to solve this, in the present embodiment, the guide ring 3 is directed toward the die 2 at the upper end 9a of the inner sleeve 9 so that the die 2 and the guide ring 3 are brought into close contact with each other when the mouth of the parison is formed. By pressing the guide ring, the guide ring pushing force f against the guide ring pushing force F is generated.

Specifically, when the positioner / inner sleeve 9 is pushed up by the spring force of the coil spring 10, the dimension of the guide ring 3 is set so that the upper end 9 a of the positioner / inner sleeve 9 contacts the guide ring 3. L1 or the dimension L2 of the inner sleeve 9 is determined, and the guide ring pushing-up force f is generated by the spring force of the coil spring 10.

In the glass forming apparatus with the conventional configuration, the function of the inner sleeve 9 is only the function of centering the plunger 4 with respect to the guide ring 3. Therefore, in the conventional configuration, the inner sleeve 9 is used in the pressing step during the parison molding. The upper end 9a of the sleeve 9 is the guide ring 3.
Never abut.

The above-mentioned guide ring pushing force f can be obtained by equation (1).

Pushing force f = spring constant of coil spring 10 × (free length of coil spring 10−set length) (1) On the other hand, guide ring pushing force F is obtained by equation (2).

Depressing force F = Internal glass pressure Fg × Cross-sectional area of guide ring 3 (2) The internal glass pressure Fg is obtained by the following equation (3), and the plunger cooling in the equation (3) is inside the plunger 4. This means supplying compressed air from below to cool the plunger 4, and the air pressure due to the plunger cooling is added to the thrust of the plunger 4 in the calculation of the equation (3).

Glass internal pressure Fg = (D ² / d ² ) × (press pressure + plunger cooling pressure × contribution rate of plunger cooling pressure to thrust) × air cylinder efficiency (3) where D is the diameter of the air cylinder And d is the diameter of the plunger. The contribution ratio of the plunger cooling pressure to the thrust and the efficiency of the air cylinder are measured in advance by experiments.

The force determined according to the equations (1), (2), and (3) is set so that (push-up force f> push-down force F).

In this embodiment, as shown in FIG. 4, a guide ring pushing-up force f corresponding to the guide ring pushing-down force F is generated in the pressing step at the time of parison molding, and these forces are (the pushing-up force f> the pushing-down force). Since the force is set as in the case of the force F), the bulging of the glass is eliminated, and the occurrence of defects such as "fraying", "chatter" or "chipping of glass" in the parison is suppressed.

According to the experimental results on the actual production line, the guide ring pushing force f by the coil spring 10
Is set to, for example, f = 200N, as shown in FIG. 5, it has been found that when the guide ring depressing force F becomes 80N higher than f = 200N, biting occurs. Therefore, in this case, it was found that if the relationship of f> F-80N was satisfied, no biting occurred.

Although the present invention has been described based on one embodiment, the present invention is not limited to the above embodiment. For example, it is clear that the biasing means is not limited to the coil spring 10 but may be another means.

[0028]

According to these inventions, the guide ring is pressed toward the die by the inner sleeve at the time of molding the mouth of the parison, so that the die and the guide ring are in close contact with each other. Therefore, even if the temperature of the glass increases and the mouth mold is thermally deformed, there is almost no gap between the mouth mold and the guide ring, so that the glass starts to bite through this gap in almost the final step of pressing by the plunger. Will not be.

Therefore, the occurrence of defects such as "fraying", "chattering" or "chipping of glass" at the parison's mouth in the shape of a celestial bite is substantially suppressed.

[Brief description of the drawings]

FIG. 1 is a view showing one embodiment of a glass bottle forming apparatus, and is a view showing a plunger down state.

FIG. 2 is a diagram showing a gore-loading state.

FIG. 3 is a diagram illustrating a state of a top dead center of the press.

FIG. 4 is a view for explaining a mechanism of celestial biting.

FIG. 5 is a diagram showing an experimental result of occurrence of bulging.

FIG. 6 is a view showing a conventional glass bottle forming apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Coarse type 2 port type 3 Guide ring 4 Plunger 5 Baffle 9 Positioner / inner sleeve 10 Coil spring 21 Parison 21a Portion

Claims (1)

[Claims] 1. A plunger vertically penetrating through an opening of a mouth mold and a guide ring provided at a lower portion of a rough mold, and is urged upward by urging means when the plunger is raised. An inner sleeve configured to allow centering of the plunger with respect to the guide ring, and forming a mouth of a parison between the mouth mold, the guide ring, and the plunger. A glass bottle forming apparatus, wherein the guide ring is pressed toward the mouth mold by the inner sleeve so that the mouth mold and the guide ring are brought into close contact with each other when the mouth portion of the parison is formed. .