JPH047157Y2 - - Google Patents

Description

[Detailed description of the invention] (Technical field) The present invention relates to a cooling tube (inner tube) for cooling a plunger used in mold blowing molding of glass or plastic products, and is particularly easy to manufacture and mechanically efficient. The present invention relates to a plunger cooling tube that has excellent strength and can exhibit a good cooling effect.

(Prior art) Conventionally, as a type of manufacturing method for glass or plastic products such as bottles and pots, air is blown into the inside of a molten glass or plastic block while it is housed in a predetermined mold. A so-called die blow molding method is known in which a product having an outer shape corresponding to the molding cavity of the mold is produced by this method.

By the way, when performing mold blow molding like this,
Before the final forming by air blowing as described above, it is necessary to make air blowing holes for blowing air. Before the final forming operation by blowing air in the finishing mold, the molten glass gob (gob) cut into a predetermined size is usually placed in a predetermined coarse mold. By carrying out a pressing operation in which a tapered plunger is inserted into the glass, a molten glass gob (parison) having holes for blowing air is formed.

When forming a parison using such a plunger, the outer surface of the plunger comes into direct contact with the gob at a high temperature (approximately 1,100 to 1,200 degrees Celsius), so it is possible to prevent the gob from seizing due to overheating. In order to prevent this and also to improve the release property against the gob, such a plunger is usually
A plunger cooling tube (inner tube) formed in a hollow shape and provided with a large number of ejection holes is inserted and arranged in the inner hole, and the air and air supplied into the cooling tube are inserted and arranged. The plunger is cooled by jetting a cooling fluid such as water onto the inner surface of the inner hole of the plunger through jet holes provided in the wall thereof.

(Problem) However, in the case of the conventional cooling tube as described above, the ejection holes are formed by machining, which makes manufacturing extremely difficult and expensive. At the same time, the provision of a large number of ejection holes causes a decrease in the mechanical strength of the cooling tube itself, which may lead to accidents such as breakage during use.

In addition, in the case of such a cooling tube, it is difficult in terms of cost and strength to provide jet holes sufficient to provide a uniform and sufficient cooling effect on the plunger over the entire wall thereof. However, when the flow rate of the cooling fluid is increased to increase the amount of cooling, the pressure (back pressure) of the cooling fluid discharged from the outlet of the inner hole of the plunger increases. Unfortunately, it also had problems such as insufficient cooling of the plunger and frequent mechanical problems such as seizure.

(Solution Means) Here, the present invention was made against the background of the above-mentioned circumstances, and its purpose is to provide a product that is easy to manufacture, has excellent mechanical strength, and has a good cooling effect. An object of the present invention is to provide a plunger cooling tube that can exhibit the following effects.

In order to achieve such an object, the present invention is characterized by infiltrating the molten glass or plastic mass housed in a predetermined mold during mold blow molding of glass or plastic products. The plunger is arranged in the inner hole of the plunger for punching the air blowing hole in the molten glass or plastic mass.
In a plunger cooling tube that cools the plunger with a cooling fluid jetted through a jet hole provided with an opening on the outside surface, the skeleton itself forming a continuous skeletal tissue is hollowed out, and the skeleton itself is hollowed out. By inserting a predetermined matrix material into the gaps between the skeletons of a ceramic structure with pores formed inside to form an integrated structure, fluid can permeate through the pores formed within the skeleton. the porous member configured to form at least a part of the outer surface portion of the plunger cooling tube located within the inner hole of the plunger; The ejection hole is formed by a hole in the member.

(Effect of the invention) In other words, in the plunger cooling tube having the structure according to the invention, the ejection holes are constituted by holes formed in the skeleton of the ceramic structure. For some reason, such ejection holes can be easily set at arbitrary positions with an appropriate distribution density, thereby making it possible to advantageously uniformly cool the plunger and improve the cooling efficiency. This makes it possible to extremely effectively prevent the occurrence of defective products and machine troubles due to burn-in and the like.

In particular, the cooling tube according to the present invention is extremely easy to manufacture because its nozzle holes are not formed by machining, and the cooling tube has excellent performance as described above. tubes can be manufactured easily and at low cost.

(Examples) Hereinafter, in order to clarify the present invention more specifically, examples of the present invention will be described in detail with reference to the drawings.

First, FIG. 1 shows an embodiment of a plunger cooling tube constructed according to the present invention. As shown in this figure, the cooling tube 10 is formed in a tapered shape having a circular cross section over its entire length, and is hollow inside and opens at the end surface on the base side. An inner hole 12 is formed.

Here, the cooling tube 10 in this embodiment is entirely constituted by the porous member 22.

That is, the porous member 22 is, for example,
After foaming a resin such as ester-based urethane, the film-like substance (foamed film) remaining around the skeleton is removed using compressed air, etc.
It is obtained by adhering a ceramic material such as ceramic slurry to the surface of the skeleton of a synthetic resin foam having a three-dimensional network structure, followed by drying and firing, as shown in Figure 2. The skeleton itself forming a continuous skeletal tissue as a whole is hollow, and the skeleton 14
Using a known ceramic structure 18 in which continuous holes 16 are formed, the ceramic structure 18 is placed in a predetermined casting cavity, and a predetermined molten metal is poured into the casting cavity. A ceramic structure 18 is integrally embedded in a predetermined cast metal 20 as shown in FIG. 3, which is formed by guiding the molten metal into the skeletal gap. The porous member 22 having the following structure is preferably used.

Note that as the ceramic material forming the ceramic structure 18, cordierite, alumina, SiC, mullite, zirconia, etc. are appropriately selected and employed depending on the characteristics required for the intended cooling tube 10. In addition, the molten metal forming the cast metal 20 has a chemical composition that is controlled according to the physical properties required for the cooling tube 10 as a product, such as an aluminum alloy or the like. Cast iron, cast steel, copper alloy, etc. are preferably used.

That is, in the case of such a porous member 22, the cast metal 2 is placed in the cells constituted by the skeleton 14 that forms the porous structure of the ceramic structure 18.
0 enters, and the cast metal 20 becomes an integral structure forming a matrix with the ceramic structure 18, while the pores 1 of the skeleton 14 in the cast ceramic structure 18
Intrusion of molten metal into the hole 6 is prevented because the opening of the hole 16 is closed, and the hole 16 is maintained in a communicating state.

In this embodiment, the ceramic structure 18 as described above is formed to have a shape corresponding to the intended cooling tube 10, and is inserted into the casting cavity of the mold forming the cooling tube 10. By performing the casting operation of the cooling tube 10 under the condition that the cooling tube 10 is placed in the A casting product is formed which forms the cooling tube 10 which is composed of the porous member 22.

Then, the inner circumferential surface of the porous member 22 is subjected to a grinding process or the like on the outer circumferential surface excluding the base side portion and the inner circumferential surface of the inner hole 12 in the cast product thus formed. Hole 1 formed in
6 are opened on the outer circumferential surface and the inner circumferential surface, thereby forming the intended cooling tube 10.

As mentioned above, such a cooling tube 10 is inserted into a molten glass gob (gob) housed in a predetermined mold (coarse mold) during mold blow molding of glass products. , the plunger 24 is inserted into the inner hole 26 of the plunger 24, which has an air blowing hole in the gob.
Although not shown, a supply flow path is connected to the base side opening of the inner hole 12, as in the conventional case, and a predetermined cooling fluid such as water or air is supplied through the supply flow path. It will be supplied into the inner hole 12.

That is, in the cooling tube 10 having such a structure, the holes 16 of the porous member 22
The cooling fluid supplied into the inner hole 12 through the supply channel flows from the inner peripheral surface of the inner hole 12 to the pores 16 of the porous member 22. The fluid is introduced into the plunger 2 and is ejected from the outer peripheral surface through the hole 16.
The plunger 24 is cooled by being sprayed onto the inner circumferential surface of the inner hole 26 of No. 4.

Since the cooling fluid ejection holes are constituted by the holes 16 of the porous member 22 in this way, the ejection holes have a fine aperture and are substantially spread over the entire wall thereof. As a result, the plunger 24 can be easily set to have a uniform distribution density, and thereby the plunger 24 can be uniformly cooled, and the cooling efficiency can be effectively improved. The mold releasability from the gob is improved, the occurrence of defective products due to seizure etc. can be effectively prevented, and operations can be stabilized.

Moreover, in the case of such a cooling tube 10,
The ejection hole is the hole 1 of the ceramic structure 18.
6, there is no reduction in strength due to the setting of a large number of ejection holes, and therefore troubles such as breakage during operation can be effectively prevented. You will get it.

In particular, since the cooling tube 10 does not require post-processing (machining) to form the ejection holes, the conventional structure in which the ejection holes are formed by post-processing is not required. It is extremely easy to manufacture compared to the conventional cooling tube, and a cooling tube having the above-mentioned excellent performance can be manufactured easily and at low cost.

Incidentally, using the plunger cooling tube 10 having the structure according to this embodiment, which is formed using cast stainless steel as the cast metal 40, cooling air is supplied as the cooling fluid at 1.0 to 1.2 Kg/cm ² (gauge pressure). or 0.4 to 0.8
By using pressurized cooling water added to Kg/cm ² (gauge pressure) and supplying the cooling fluid from the opening of the inner hole 12 (inner diameter: 19.1 mmφ),
When glass gobs (gobs) were continuously formed as described above while being ejected onto the outer peripheral surface through the holes 16 formed in the wall,
The plunger 24 could be cooled well, and the forming operation could be performed stably. In addition,
Air and water consumption during such molding operations are 0.8-1.0N/min and 0.4-0.6N, respectively.
/min.

Although one embodiment of the present invention has been described in detail above, this is a literal illustration, and the present invention is based on the following:
It is not intended to be interpreted as being limited to such specific examples.

For example, the cooling tube 1 in the above embodiment
In the case of No. 0, the entire body was made up of the porous member 22, but a portion thereof, for example, only the tip portion thereof may be made up of the porous member 22.

Moreover, the cooling tube 10 in the above embodiment
In this case, an inner hole 12 is provided in the interior thereof, and the wall portion is made substantially uniform throughout.
In the past, attempts have been made to uniformize the amount of cooling fluid ejected by ejecting, but in particular, in the case of the porous member 22 as illustrated, the pores 16 formed inside the porous member 22 are three-dimensional. Since the cooling tube is continuous with the cooling tube, it is also possible to form the cooling tube in a solid shape and provide a fluid supply hole on the base side thereof that communicates with the cavity formed inside. It is.

Furthermore, the ceramic structure 18 used in the present invention is not limited to one having a three-dimensional network structure as illustrated, but also includes
It is also possible to use those having other skeleton structures such as a crest shape or a comb shape.

In addition, in the above embodiment, for the plunger used when forming the molten glass gob,
Although an example in which the present invention is applied has been shown, the present invention can be similarly applied to a plunger used in molding a molten plastic lump, thereby achieving the same effects as the above embodiment. Of course, it can also be effectively performed.

Although not listed in detail, the present invention may be implemented with various changes, modifications, improvements, etc. based on the knowledge of those skilled in the art, and such embodiments may be implemented in accordance with the present invention. It goes without saying that any of these are included within the scope of the present invention as long as they do not deviate from the spirit.

[Brief explanation of the drawing]

FIG. 1 is an explanatory longitudinal cross-sectional view showing one embodiment of a plunger cooling tube constructed according to the present invention, and FIG. 2 is a main part of a ceramic structure suitably used in manufacturing such a plunger cooling tube. FIG. 3 is an enlarged cross-sectional explanatory view showing a main part of a porous member formed using such a ceramic structure. 10...Cooling tube, 12...Inner hole, 14
... Skeleton, 16 ... Hole, 18 ... Ceramic structure, 20 ... Cast metal, 22 ... Porous member, 24 ... Plunger.

Claims (1)

[Scope of Claim for Utility Model Registration] During mold blow molding of glass or plastic products, the molten glass or plastic mass is infiltrated into the molten glass or plastic mass housed in a predetermined mold. A plunger having an air blowing hole is cooled with cooling fluid jetted out through a jet hole that is placed in the inner hole and opened to the outside. In the plunger cooling tube, the skeleton itself forming a continuous skeletal structure is hollow, and a predetermined matrix material is inserted into the gaps between the skeletons in the ceramic structure with holes formed in the skeleton. By using a porous member having a structure that allows fluid to pass through holes formed in the skeleton, the plunger in the plunger cooling tube is cooled by the porous member. in the pores of the porous member by forming at least a portion of the outer surface portion located within the inner pore;
A plunger cooling tube characterized by comprising the above-mentioned ejection holes.