JPH0620577Y2 - Mold device for molding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a mold device for molding a resin molding on the peripheral portion of a front window glass or a rear window glass of an automobile.

(Prior Art) As a front or rear window glass of an automobile, there is known one in which a molding is formed at a peripheral portion and the molding is closely attached to a window frame. Then, in order to mold such a molding, the peripheral edge of the window glass is exposed in the cavity formed by closing a pair of molds, and in this state, a thermoplastic resin such as polyvinyl chloride is melted in the cavity. It is then injected and cooled and hardened to form a molding.

However, since burrs and the like are generated at the boundary between the molding and the glass, it is necessary to perform post-work in order to make the parting line well.

Therefore, as a method of accurately drawing out the parting line, Japanese Patent Publication No. 63-12809
Or the method disclosed in Japanese Examined Patent Publication No. 63-12810 is known. In this method, a coating layer is formed on the glass surface before injection molding the molding, then the molding is formed and a coating film is formed on the molding surface, and then the coating layer is cut with a cutter along the parting line of the molding. Then, the cut coating layer is peeled off from the glass surface so that the parting line is clearly drawn.

(Problems to be solved by the invention) In the above-mentioned conventional method, it takes time and effort to form a coating layer on the glass surface and then cut and shave it,
Moreover, the material is wasted, and the glass may be damaged by the cutter.

(Means for Solving the Problem) In order to solve the above problems, the present invention provides a minute gap between the parting part of the mold and the windshield and a cooling passage inside the parting part.

(Operation) By providing a gap between the parting portion of the mold and the wind glass, direct adhesion between the mold and the wind glass is avoided, glass breakage is prevented, and the gap is minute and the portion is cooled. Therefore, the raw material resin does not enter, and the work of drawing the parting line is unnecessary.

(Embodiment) An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view of a main part of a mold device according to the present invention. The mold device comprises an upper mold 1 and a lower mold 2, and a cavity for molding a molding by closing the upper mold 1 and the lower mold 2. 3 is formed.

Further, nests 4 and 4 are provided at the parting portions of the upper mold 1 and the lower mold 2 to form a minute gap g with the window glass G. Here, the gap g is set to 0.05 to 0.1 mm so that the raw material resin does not easily enter. Further nesting 4
Is made of a material having excellent thermal conductivity (cooling property) such as copper or brass, a cooling water passage 5 is formed in a part of the material, and Teflon is provided between the mold and the insert 4. A heat insulating material 6 also serving as a seal is interposed.

Further, the insert 4 contacts the insert retainer 7 with a tapered surface,
By rotating the bolt 8, the insert 4 is pressed against the mold 1 or 2 side through the insert retainer 7 so that the gap g is accurately maintained, and the bolt 8 is further rotated in the reverse direction to retain the insert retainer. By making 7 retracted, the nest 4 can be replaced, and even if the window glass G has a different thickness, it is sufficient to replace only the nest 4. Reference numerals 9 and 10 are cooling water passages formed in the upper mold 1 and the lower mold 2.

In the above, the peripheral edge of the window glass G is exposed in the cavity 3 formed by closing the upper mold 1 and the lower mold 2, and the thermoplastic resin such as polyvinyl chloride that is heated and melted is injected into the cavity 3. Then, the injected resin spreads into the cavity 3, but the gap g is narrow and the cooling water passage 5
Since the temperature is low, the raw material resin is also cooled and the fluidity is lowered, so that the raw material resin does not enter the gap g. Therefore, the parting line is accurately formed.

2 is a sectional view similar to FIG. 1 showing another embodiment,
In this embodiment, the heat insulating tube 11 is extended from the cooling water passage 5 formed in the upper mold 1 and the lower mold 2 toward the parting portion, and the spiral water passage 12 is provided in the heat insulating tube 11.
The spiral water channel 12 is connected to a cooling chamber 13 located in the vicinity of the parting portion, and the parting part is cooled by the cooling chamber 13. By doing so, the parting portion can be cooled very effectively.

In any of the embodiments shown in FIGS. 1 and 2, the window glass G is directly held by an elastic body made of urethane resin or the like provided in the mold.
I try not to get hurt.

(Effects of the Invention) As described above, according to the present invention, when molding the molding on the peripheral edge of the window glass, the glass is not damaged because a gap is provided between the parting part of the mold and the window glass, and the parting part is not formed. Since the resin is cooled, the raw material resin does not enter the parting portion, and it is not necessary to remove the burr in the subsequent process.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a mold device according to the present invention, and FIG. 2 is a sectional view similar to FIG. 1 showing another embodiment. In the drawings, 1 is an upper mold, 2 is a lower mold, 3 is a cavity, 4 is an insert, 5 is a cooling water passage, 7 is an insert holder, 12 is a spiral water passage, and 13 is a cooling chamber.

Claims (2)

[Scope of utility model registration request] 1. A molding apparatus for molding a mold in which a raw material resin is injected and cured in a cavity formed between a pair of molds with a peripheral edge of wind glass facing the cavity. Mold device for forming a boundary between the glass and the glass, wherein a minute gap is provided between the parting part of the mold and the glass, and a cooling passage is formed in the vicinity of the parting part. . 2. The molding die apparatus according to claim 1, wherein a parting insert of the mold is attached to the parting part, and a cooling passage is formed in the parting insert.