JP2569085Y2 - Mold holding structure for insert - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insert holding structure for a molding die.

[0002]

2. Description of the Related Art Generally, when molding a component such as an instrument panel of a vehicle, an insert made of an iron plate or a resin plate is attached to a pressing die of a molding die, and is integrally formed with a foamed resin material.

[0003] As a method of positioning and fixing the insert to the pressing die, for example, when the insert is made of metal, the insert is attracted and fixed to the surface of the pressing die by a magnet embedded in the pressing die. When the insert is made of resin, there is a method in which a slide-type reference pin is formed in the pressing die, and a pin hole corresponding to the reference pin is provided in the insert, and the insert is attached and fixed to the reference pin of the pressing die. . This reference pin is often provided at several places in the under part of the stamp.

[0004] However, in the latter case, in particular, when the molding die does not have a protruding under part of the reference pin, or when the molded product cannot be provided with a reference pin such as a thin or small article. In this case, it was difficult to accurately position and fix the insert in the mold. In addition, the resin material leaks from the pin hole formed in the insert to the back side of the molded product, which may cause burrs or the like on the product.

[0005]

SUMMARY OF THE INVENTION The present invention has been proposed in view of such a problem, and ensures that an insert can be securely inserted even in a molding die in which a reference pin for fixing an insert cannot be provided. An object of the present invention is to provide a mold insert holding structure that can be held and fixed.

[0006]

Means for Solving the Problems That is, the present invention provides:
A suction cup made of an elastic material for adsorbing the insert is provided in the insert holding portion of the molding die in a state of slightly projecting inward, the suction cup is connected to the vacuum suction section, and a pressure switch is provided in the vacuum suction section to provide a predetermined pressure. The insert holding structure of the molding die is characterized in that the setting of the insert is confirmed by the vacuum pressure.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a cross-sectional view of a molding die showing an example of the insert holding structure of the present invention, FIG. 2 is a cross-sectional view of a molding die showing a main part thereof, and FIG. 3 is another example of a suction cup used in the insert holding structure of the present invention. FIG.

As shown in FIGS. 1 and 2, the insert holding structure of the present invention has a predetermined molded product cavity C.
And a suction cup 20 provided on the insert holding portion 11 of the molding die 10 having the above structure.

The suction cup 20 is made of an elastic material such as rubber, and is provided in a mounting portion 12 formed on the insert holding portion 11 so as to slightly protrude into the mold as shown in FIG. An insert I made of resin or the like is suction-held on the holding portion 11. Reference numeral 30 denotes a mounting stay for fixing the suction cup 20 at a predetermined projecting position on the mold surface, 31 denotes an adjusting nut, P denotes a foamed resin product, and A denotes a skin material disposed in the cavity C as required.

As can be better understood from FIG. 2, the length S of the suction cup 20 protruding inward of the mold is formed to be about 2 to 3 mm in a state in which the insert is not sucked. Is contracted, the insert I is pulled up in the direction of the holding portion 11 and is strongly adhered to the mold surface. The number of the suction cups 20 attached to the insert holding portion 11 can be appropriately determined according to the size and shape of the insert I.

The suction cup 20 is connected to a vacuum suction unit 40 such as a vacuum pump provided outside the apparatus via a vacuum pipe 35 or the like, and the vacuum suction is performed by adding the insert I to the suction force of the suction cup 20. It is securely held and fixed to the mold surface by the vacuum pressure of the part 40. 32 is a hose joint, 4
1 is a pressure control valve.

In the present invention, a pressure switch 45 is provided in the vacuum suction unit 40. The pressure switch 45
Is provided with a known pressure gauge or the like (not shown), and is turned on / off when a predetermined vacuum pressure is reached, so that the setting of the insert can be confirmed. When the insert I is securely held by suction on the suction cup 20, the ultimate vacuum pressure of the pressure gauge is approximately 750 m
Shows mHg. The case where the ultimate vacuum degree does not reach 750 mmHg is a case where the insert I has not been arranged on the holding portion 11 yet, or the positioning and suction are insufficient. Here, the detected vacuum degree is a predetermined value, for example, 750.
When the mmHg is reached, the completion of the setting of the insert is confirmed, the pressure switch 45 is operated, and the signal for injecting the molding material into the mold is issued.

When the suction position of the suction cup in the insert is a curved surface, as shown in FIG.
It is preferable that the hose joint 51 and the hose joint 51 are connected via a universal joint 52. Thereby, the suction cup 50 can be freely rotated according to the curved shape of the insert, and the insert can be surely fixed by suction.

[0014]

As shown and described above, according to the insert holding structure of the molding die of the present invention, for example, even if the molding die cannot be provided with a reference pin for fixing the insert, the molding die has a thin or Even if the insert shape is such that it is difficult to form a pin hole such as a small object, the insert can be securely held and fixed to the mold surface. In addition, a pressure switch is provided in the vacuum suction unit so that the setting of the insert can be confirmed by a predetermined vacuum pressure, so that the completion of the setting of the insert is surely confirmed, and the positioning of the insert is insufficient or the suction is insufficient. It is possible to prevent molding trouble due to the above.

[Brief description of the drawings]

FIG. 1 is a sectional view of a molding die showing an example of the insert holding structure of the present invention.

FIG. 2 is a sectional view of a molding die showing a main part thereof.

FIG. 3 is a view showing another example of a suction cup used in the insert holding structure of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Mold 11 Insert holding part 20 Suction cup 40 Vacuum suction part 45 Pressure switch

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI B29L 31:58

Claims (1)

(57) [Scope of request for utility model registration] 1. A suction cup made of an elastic material for adsorbing an insert in a state where it is slightly protruded inward of a mold is provided in an insert holding section of a molding die, the suction cup is connected to a vacuum suction section, and a pressure is applied to the vacuum suction section. An insert holding structure for a molding die, characterized in that a switch is provided so that the setting of the insert is confirmed by a predetermined vacuum pressure.