JPS644492Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a molding die to which a medium mold is detachably attached.

Cushion materials such as urethane foam are generally manufactured by molding.

Cushion materials are required to have quite complex shapes depending on their use. For example, when making a cushion material with a recess, a bulge corresponding to the recess must be integrally formed on the inner surface of the mold in advance.

However, in mold forming where part of the mold bites into the inside of the molded product, it is difficult to remove the molded product smoothly, and if demolding is forced,
The surface layer of flexible cushion materials such as urethane foam is easily torn or worn out. As a result, there has been a problem in the past with a high incidence of defective products and time-consuming corrections.

Therefore, in this invention, the part corresponding to the bulging part is made into a medium mold, and it is attached to the upper mold or the lower mold via a magnet so that it can be freely attached and detached, and it bites into the part where the molded product is to be formed, so that demolding can be done smoothly. It was designed to be carried out.

Here, the molded product according to the present invention is one in which a part of the mold bites into the inside of the molded product, that is, has a hollow body (recess).

Further, a detailed explanation will be given based on the drawings.

In the figure, 1 is the upper type, 2 is the lower type, 3 is the middle type,
Both are made of aluminum, polyester resin, etc.

A magnet 4 is buried in the surface layer of the medium 3,
A magnetic metal plate 5 made of iron or the like is embedded in the inner wall of the upper mold 1, and the middle mold 3 is attracted to the upper mold 1 by the magnetic force acting between the magnet 4 and the magnetic metal plate 5. When the urethane foam 6 is manufactured using a mold having such a configuration, damage to the urethane foam 6 due to demolding can be reliably prevented.

That is, when the upper mold 1 is opened, the middle mold 3 is separated from the upper mold 1 and remains within the urethane foam 6, so that the bent portion 6a of the urethane foam 6 is not damaged in any way. After opening the upper mold 1, remove the urethane home 6 from the lower mold 2 while holding the middle mold 3, and then remove the middle mold 3, or first remove the middle mold 3 and then remove the urethane home 6 from the lower mold. You can remove it from 2. However, in this invention, the middle mold 3 can be attracted to the lower mold 2 depending on the purpose and shape of the urethane foam 6. Further, the arrangement of the magnets 4 and the magnetic metal plates 5 may be reversed between the middle mold 3 and the upper mold 1 or the lower mold 2, and the number and position of the magnets can be changed as appropriate.

As explained above, in the molding die of this invention, the middle mold is detachably attached to the upper mold or the lower mold through the attraction force of the magnet, so even in molding where part of the mold bites into the molded product, the molding die can be easily molded. The product can be demolded smoothly without damaging the product, and is particularly effective in eliminating defective products when molding foams such as headrests, safety pads, vehicle cushions, and furniture cushions.

[Brief explanation of the drawing]

The drawing is a longitudinal sectional view of a mold forming die showing an embodiment of this invention. 1...upper type, 2...lower type, 3...middle size, 4...
Magnet, 5...Magnetic metal plate, 6...Urethane foam.

Claims (1)

[Scope of utility model registration request] A molding die characterized in that a middle die is detachably attached to an upper die or a lower die via a magnet so as to bite into a portion where a molded product is to be formed.