JP3673144B2 - Bottom mold - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bottom mold that is a part of a glass bottle molding facility and is set at a lower part of a finishing mold in the final blowing of the glass bottle and molds the bottom of the glass bottle.
[0002]
[Prior art]
With reference to FIG. 10, the process of shape | molding a glass bottle by the conventional blow and blow system is demonstrated roughly. 10a to 10c, a parison P is manufactured as a semi-finished product from a molten glass lump (gob) G using a rough mold 30. In FIG. 10d, this parison P is finished using a reversing device (mechanism) 35. 34, and the glass bottle B as the final product is formed in the finishing die 34 in FIGS. FIG. 10f shows the state of final blowing. In FIG. 10 g, the glass bottle B is taken out from the finishing mold 34. In the figure, reference numeral 1 is a bottom mold, 31 is a baffle, 32 is a mouth mold, and 33 is a guide ring.
[0003]
FIG. 7 is a central longitudinal sectional view of a conventional bottom mold. The entire bottom mold 1 is integrally formed of a casting. The upper surface of the bottom mold 1 is a molding surface 4 for molding the bottom of the glass bottle. The lowermost portion is a flange portion 8 for attaching to a glass bottle molding machine, and the upper portion is a constricted portion 9 for the lower portion of the finishing die 34 to enter. An air hole 11 through which cooling air normally passes is formed inside.
[0004]
[Problems to be solved by the invention]
Since the conventional bottom mold was integrally formed of a casting, it was easy to take the heat of the glass, the temperature at the bottom or bottom corner of the glass bottle decreased, the fluidity of the glass deteriorated, and the `` streaks '' ”And“ wrinkles ”are easily caused by“ cracks ”at the bottom corners, and knurling and engraving are also unclear. In addition, as shown in FIG. 8, when the finishing mold is opened, the shoulders and skirts of the glass bottle B are pulled by the finishing mold, and a rotational force may be generated in the glass bottle. In such a case, an excessive force is applied to the shoulder or hem of the glass bottle B to cause a “chatter” defect, or the glass bottle falls down or twists.
[0005]
According to the present invention, the bottom of the glass bottle has “streaks” and “wrinkles”, the bottom corner has no “chatter”, the knurling and marking are clear, and the glass bottle B has a shoulder and bottom. The object of the present invention is to provide a bottom mold in which the drawbacks of “chatter” are unlikely to occur and the glass bottle is not easily tilted or twisted.
[0006]
[Means for Solving the Problems]
The present invention relates to a bottom mold that is set in a lower part of a finishing mold in the final blowing of a glass bottle and forms a bottom part of the glass bottle with an upper molding surface, and an upper molding part including the molding surface and a lower main body, Is formed as a separate body, and the molded part is attached to the upper part of the main body so as to be detachable and rotatable with respect to the main body.
[0007]
In the bottom mold of the present invention, the molding part having the molding surface is formed separately from the main body, so that it is difficult for heat to be transmitted from the molding part to the main body. For this reason, the temperature of the molding surface is increased, the temperature drop at the bottom of the glass bottle or the bottom corner is reduced, and the drawbacks of `` streaks '' and `` wrinkles '' at the bottom of the glass bottle and `` chatting '' at the bottom corner are prevented, Knurling and engraving can be made clear.
[0008]
Since the molded part is rotatably attached to the main body, as shown in FIG. 3, when the finishing mold is opened, the shoulder and hem of the glass bottle B are pulled to the finishing mold, and a rotational force is generated in the glass bottle. However, since the molding part and the glass bottle B are rotated and an excessive force does not act on the glass bottle B, the “bottle” defect occurs in the shoulder part or the hem part, or the glass bottle falls down or twists. There is nothing.
[0009]
The specific shapes of the main body and the molded part can be as follows, for example. The main body is generally disk-shaped, and has a flange portion at the bottom, a constriction at the top, and a recess at the top. The molding part has an overall disc shape, and a molding surface is formed on the upper surface and a shaft part is formed on the lower surface. And a shaping | molding part can be easily attached to a main body by inserting the axial part of a shaping | molding part in the recessed part of a main body.
[0010]
In this case, when the cross-sectional shape of the concave portion and the shaft portion is circular, and the inner diameter of the concave portion is slightly larger than the outer diameter of the shaft portion, the molded portion can rotate with respect to the main body.
[0011]
Furthermore, when the length of the shaft portion is slightly longer than the depth of the concave portion, the molded portion can be easily rotated with respect to the main body.
[0012]
An annular groove is formed in the grounding part of the molding surface of the molding part (the part forming the grounding part at the bottom of the glass bottle), and a grounding part molding ring having a grounding part molding surface on the upper surface is fitted into this annular groove. can do. Thus, by making the part for forming the grounding part of the glass bottle as a separate body, the temperature drop of the grounding part of the glass bottle is further reduced and the fluidity of the glass is not impaired, and the knurling formed on the grounding part is It becomes clearer.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings showing examples. 1 is a longitudinal sectional view of the bottom mold of Example 1, FIG. 2 is a side view of the bottom mold of Example 1, and FIG. 3 is a glass bottle when the finishing mold is opened when the bottom mold of Example 1 is used. 4 is a longitudinal sectional view of the bottom mold of Reference Example 1 , FIG. 5 is a longitudinal sectional view of the bottom mold of Reference Example 2 , FIG. 6 is a longitudinal sectional view of the bottom mold of Example 2 , and FIG. Is a longitudinal sectional view of a conventional bottom mold, FIG. 8 is an explanatory diagram of the behavior of a glass bottle when a finishing mold is opened when the conventional bottom mold is used, and FIG. 9 is a diagram illustrating Example 1, Reference Example 1 and a conventional one. It is explanatory drawing of the temperature distribution of the molding surface of a bottom mold.
[0014]
[Example 1]
1 to 3 includes a main body 2 and a molding portion 3. The main body 2 is generally disc-shaped, with a flange 8 for attaching to a glass bottle molding machine at the bottom, a constricted part 9 for entering the lower part of the finishing die 34 at the upper part, and a concave part with a circular cross section on the upper surface. 10 is formed. The molding part 3 has a substantially disk shape as a whole, a molding surface 4 forming the bottom or bottom corner of the glass bottle on the upper surface, and a shaft section 5 having a circular cross section on the lower surface. Forming unit 3 the shaft portion 5 of the molding portion 3 by fitted into the recess 10 of the body 2 are kicked Replacing the body 2. The inner diameter of the concave portion 10 is 0.2 mm larger than the outer diameter of the shaft portion 5, and the length of the shaft portion 5 is 0.2 mm longer than the depth of the concave portion 10. For this reason, the molding part 3 can be easily rotated with respect to the main body 2. A retaining bolt hole is formed on the side surface of the main body 2, and an engaging groove 7 is formed on the side surface of the shaft portion 5 of the molding portion 3, and the tip of the retaining bolt 12 is engaged. It is prevented from getting out of it. The width of the engaging groove 7 is slightly wider than the diameter of the tip of the retaining bolt, and the length is such that the molded part 3 can rotate 20 °. Further, a protrusion 6 for positioning is formed on the side surface of the molded part 3. As shown in FIG. 3, a notch 21 is formed on the mating surface of the finishing die 34, and when the finishing die 34 is closed, the protrusion 6 is fitted into the notch 21, so that the molding part 3 is formed. Positioned. Reference numeral 11 denotes an air hole through which cooling air is inserted.
[0015]
Since this bottom mold 1 is formed with the molding part 3 having the molding surface 4 as a separate body from the main body 2, heat is hardly transmitted from the molding part 3 to the main body 2. For this reason, the temperature of the molding surface 4 is increased, the temperature drop at the bottom of the glass bottle B or the bottom corner is reduced, and the “streaks” and “wrinkles” at the bottom of the glass bottle and the “chatter” at the bottom corner are disadvantageous. Prevents knurling and engraving.
[0016]
Since the forming part 3 can rotate with respect to the main body 2, as shown in FIG. 3, even if a rotational force is generated in the glass bottle B when the finishing mold is opened, the glass bottle B rotates together with the forming part 3. Therefore, an excessive force does not act on the glass bottle B, and there is no “chatter” defect in the shoulder or hem, and the glass bottle does not fall down or twist.
[0017]
In addition, since the molded part 3 is detachable from the main body 2, it is possible to mold other types of glass bottles by simply replacing the molded part 3, and the molded part 4 can also be worn when the molded surface 4 is worn. Since only 3 needs to be replaced, the cost can be reduced.
[0018]
[ Reference Example 1 ]
In the bottom mold 1 of Reference Example 1 shown in FIG. 4, the outer peripheral portion including the grounding portion 14 of the molding surface 4 is separated from the bottom mold body 2 as an outer peripheral molding ring 13. The grounding portion 14 is a portion that forms a portion to be grounded at the lowermost portion of the bottom of the glass bottle, and a knurling is formed in the grounding portion 14. An outer peripheral notch 16 is formed on the upper outer peripheral portion of the main body 2. An outer peripheral forming ring 13 is detachably fitted to the outer peripheral notch 16. The outer peripheral forming ring 13 is fixed with a retaining bolt 12.
[0019]
Since this bottom mold 1 is formed separately from the bottom mold main body 2 with the outer peripheral part including the grounding part of the molding surface 4 as the outer peripheral part molding ring 13, the glass bottle from the grounding part 14 to the hem corner part 4a is formed. A decrease in glass temperature is reduced, the defect of “chatter” at the bottom corner 4a can be prevented, and knurling and marking can be made clear.
[0020]
FIG. 9 shows the temperature distribution from the center of the molding surface 4 of Example 1, Reference Example 1 and the conventional bottom mold to the outermost hem corner. The curve of A shows Example 1, the curve of B shows Reference Example 1 , and the curve of C shows a conventional outer mold. As is clear from the figure, in Example 1, the temperature of the entire molding surface is higher than that of the conventional bottom mold, and in Reference Example 1 , the temperature is higher from the grounding portion to the bottom corner portion.
[0021]
[ Reference Example 2 ]
In the bottom mold 1 of Reference Example 2 shown in FIG. 5, an annular groove 18 is formed in the grounding portion 14 of the molding surface 4. The annular groove 18 is fitted with a grounding part molding ring 19 having a grounding part molding surface on the upper surface. The grounding part forming ring 19 is detachably fixed by a retaining bolt 20.
[0022]
This bottom mold 1 has a separate portion for forming the grounding part of the glass bottle (grounding part molding ring 19), so that the temperature drop of the grounding part of the glass bottle is reduced and the fluidity of the glass is not impaired. The knurling formed in the grounding portion becomes clear.
[0023]
[Example 2 ]
A bottom mold 1 of Example 2 shown in FIG. 6 is a combination of Example 1 of FIG. 1 and Reference Example 2 of FIG. That is, an annular groove 18 is formed in the grounding part of the molding surface 4 of the molding part 3 in FIG. 1, and a grounding part molding ring 19 having a grounding part molding surface on the upper surface is fitted into the annular groove 18. The grounding part forming ring 19 is detachably fixed by a retaining bolt 20.
[0024]
This bottom mold 1 has a glass bottle grounding part (grounding part molding ring 19) formed separately from the molding part 3 so that the temperature drop of the glass bottle grounding part is further reduced. The fluidity is not impaired, and the knurling formed on the ground contact portion becomes clearer.
[0025]
In the above embodiment, the glass bottle was formed by the blow and blow method. However, the present invention can be used in the press and blow method in the same manner. In addition, it is needless to say that the shapes of the bottom mold, the main body, the molded portion and the like in the embodiments are merely examples.
[0026]
【The invention's effect】
The bottom mold of the present invention is free from the drawbacks of “streaks” and “wrinkles” at the bottom of the glass bottle, and the defects of “chatter” at the corners of the hem. The “bottom” defect is less likely to occur at the hem, and the glass bottle is less likely to fall or twist.
[0027]
Moreover, since the molding part 3 is detachable from the main body 2, it is possible to mold other types of glass bottles by simply replacing the molding part 3, and when the molding surface 4 is worn, Since only 3 needs to be replaced, the cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a vertical sectional view of a bottom mold of Example 1. FIG.
FIG. 2 is a side view of the bottom mold according to the first embodiment.
FIG. 3 is an explanatory view of the behavior of a glass bottle when a finishing mold is opened when the bottom mold of Example 1 is used.
4 is a longitudinal sectional view of a bottom mold of Reference Example 1. FIG.
5 is a vertical sectional view of a bottom mold of Reference Example 2. FIG.
6 is a longitudinal sectional view of a bottom mold of Example 2. FIG.
FIG. 7 is a vertical sectional view of a conventional bottom mold.
FIG. 8 is an explanatory view of the behavior of a glass bottle when a finishing mold is opened when a conventional bottom mold is used.
FIG. 9 is an explanatory diagram of a temperature distribution on a molding surface of Example 1, Reference Example 1, and a conventional bottom mold.
FIG. 10 is an explanatory diagram of parison molding.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Bottom mold 2 Main body 3 Molding part 4 Molding surface 5 Shaft part 6 Protrusion 7 Engagement groove 8 Flange part 9 Neck part 10 Recess 11 Air hole 12 Retaining bolt 13 Outer part formation ring 14 Grounding part 15 Annular engagement part 16 Outer periphery notch Part 17 Annular engagement groove 18 Annular groove 19 Grounding part forming ring 20 Stop bolt 21 Notch part 30 Coarse mold 31 Baffle 32 Mouth mold 33 Guide ring 34 Finishing mold 35 Mechanism

Claims (5)

  In the final blowing of glass bottles, in the bottom mold that is set at the bottom of the finishing mold and molds the bottom of the glass bottle with the molding surface of the upper surface, the upper molding part including the molding surface and the lower body are separated. A bottom mold characterized in that it is formed and the molded part is detachably attached to the upper part of the main body and rotatably attached to the main body   2. The bottom mold according to claim 1, wherein the main body has a substantially disc shape, a flange portion at a lower portion, a constricted portion at an upper portion thereof, and a concave portion at an upper surface thereof, and the molding portion has a substantially disc shape, and has an upper surface. The bottom mold is characterized in that it has a molding surface and a shaft portion on the lower surface, and the molding portion is attached to the main body by fitting the shaft portion into the recess.   3. The bottom mold according to claim 2, wherein the concave portion and the shaft portion have a circular cross section, the inner diameter of the concave portion is slightly larger than the outer diameter of the shaft portion, and the molding portion rotates with respect to the main body. Bottom mold characterized by being able to   4. The bottom mold according to claim 3, wherein the length of the shaft portion is slightly longer than the depth of the recess.   5. The bottom mold according to claim 1, wherein an annular groove is formed in a grounding portion of a molding surface of the molding portion, and a grounding portion molding ring having a grounding portion molding surface on the upper surface is fitted into the annular groove. Bottom mold characterized by being combined

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