JP2952688B2 - Mold for cold press - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a mold for a cold press used when manufacturing interior parts such as various trims of an automobile.

[Conventional technology]

For example, various trims and the like of automobiles are composite molded bodies in which a base material is pressure-bonded to a skin layer, and a cold press method is often used as a method for manufacturing these.

As the cold press method, for example, Japanese Patent Application Laid-Open No. 62-181111
And Japanese Patent Application Laid-Open No. 62-181114, which will be described with reference to FIGS. 3 and 4. FIG.

Reference numeral 1 denotes an upper die, which is moved up and down by a pressing device (not shown) to press a pair of pressed articles on the lower die 2.

The skin layer 4 is positioned between the molding surfaces 5 and 6 of the upper mold 1 and the lower mold 2 before pressing, and the molding surface 6
The substrate material 3 in a molten state is placed on the substrate.

A side land portion (hereinafter referred to as a land) 7 having a draft with respect to the pressing direction is provided at an extension of the outer peripheral end of the molding region of the base material 3 on each of the molding surfaces 5 and 6 of the upper mold 1 and the lower mold 2. ,
The lands 7 and 8 are formed so that the gap at the time of molding and pressing is substantially the same as the thickness of the skin layer 4 at the time of pressing and molding.

 The operation of the known device having the above configuration will be described.

Before pressurization, thickness between the molding surfaces 5 and 6 of the upper mold 1 and the lower mold 2
A sheet-like skin layer 4 of 0.3 to 4 mm woven fabric, carpet or other raised fiber products or soft vinyl chloride resin is held by a clamp device (not shown).

Then, the molding surface 6 of the lower mold 2 adjusted to about 30 to 50 ° C. is heated to 150 to 250 ° C. through a nozzle of an extruder (not shown) to be in a semi-molten state, for example, polypropylene, A base material 3 of a thermoplastic resin such as polyethylene is placed, and the upper die 1 is pressed downward by a pressing device (not shown), and the skin layer 4 and the base material 3 are compressed between the lower die 2 and the upper die 1. It is joined to produce a composite molded body.

At this time, the gap between the lands 7 and 8 of the upper mold 1 and the lower mold 2 is substantially the same as the thickness of the skin layer 4 at the time of pressing and molding. Even in the state, it does not flow out of the dies from the lands 7 and 8 and the burrs are not generated.

[Problems to be solved by the invention]

However, in the above apparatus, even if the seat back panel itself has the same dimensions, if the thickness of the skin layer 4 is changed by changing the material of the skin layer 4, if the same upper and lower dies 1, 2 are used, the land 7 , 8 are too wide or narrower than the thickness of the skin layer 4 to cause a problem.

In other words, when the base material 3 is wide, the molten base material 3 protrudes into the land and becomes a burr-like shape. When the base material 3 is narrow, the upper and lower dies are tightly fitted, so that there is a problem that compression molding cannot be performed.

Therefore, even if the dimensions of the product (seat back, etc.) are the same, a plurality of molds are manufactured for both the upper mold 1 and the lower mold 2 depending on the thickness due to the difference in the material of the skin layer 4 and the like, and the maintenance and management are not performed And there was a major problem in their cost and storage location.

In order to solve such a problem, there has been a demand for a dual-purpose press die that can be manufactured with the same set of molding dies even if the skin layer is changed, as long as the product has at least the basic dimensions of the same product.

An object of the present invention is to solve the above-mentioned problems, and to provide a press die capable of press-forming various types of products having different skin layers with the same die.

[Means for solving the problem]

The present invention relates to a cold press mold for producing a composite molded article comprising a skin layer and a base material layer, wherein a heat-resistant elastic land body is fixed to opposed side land portions in upper and lower molds of the press mold. is there.

(Operation)

In the press die of the present invention having the above structure, a laminated skin layer is first inserted by a clamp device or the like in the middle of the molding surfaces of the upper die and the lower die, and on the molding surface of the lower die, The base material which has been heated to 150 to 250 ° C. and turned into a semi-molten body is placed by a nozzle or the like.

Next, the upper die is pressed down by a pressing device,
The skin layer and the base material are compression molded. At this time, the base material in the half-molten state is extended by the pressing force of the upper mold,
It is spread over the entire molding surface of the lower mold.

During the compression molding, the heat-resistant elastic land body fixed to the side land portions is deformed according to the thickness of the skin layer. Therefore, regardless of the thickness of the skin layer, and even when the base material is in a semi-molten state, it is blocked at the upper end of the land portion, and even if the skin material is a composite molded body having different skin layer thicknesses, Does not flow out of the surface.

〔Example〕

An example in which the present invention is applied to an automobile seat back panel will be described in detail with reference to FIGS.

FIG. 1 is an enlarged schematic cross-sectional view of a side land portion, which is a main part of the present invention, similarly to FIG. 4, and shows an example in which a skin material is thin.

Reference numeral 11 denotes an upper mold for cold press molding which is paired with the lower mold 12. The inner surface land portion 17 formed continuously with the molding surface 15 of the upper die 11 is formed in substantially the same manner as the conventional land 7 shown in FIGS.

Side land portion 18 where the formed following the molding surface 16 of the lower mold 12 is formed so as to maintain the gap D ₀ between the inner surface land portion 17, so as to satisfy most of the gap D _0, thereunder A heat-resistant elastic land body 20 serving as a sleeve is placed on and fixed to the formed step portion 19.

Inner surface land portion of the heat resistant elastic land body 20 and the upper mold 11
Clearance D ₁ of the between 17 are set approximately 0 and either, or as follows. That this gap D ₁ is, for example, a skin material 22 consisting of PVC-based sheet, so that the cushion material 23 of the foam polypropylene is substantially equal to the thickness after press forming the skin layer 24 is laminated, the heat The thickness t of the elastic elastic land body 20 is determined.

 Next, the operation of the press die of the present invention will be described.

First, a skin layer 24 laminated between the molding surfaces 15 and 16 of the upper mold 11 and the lower mold 12 is loaded by a clamp device (not shown).
The base material 21 heated to about 250 ° C. and in a semi-molten state is placed by a nozzle (not shown).

Next, the upper die 11 is pressed down by a pressing device (not shown), and the skin layer 24 and the base material 21 are compression-molded. At this time, the base material 21 in a half-molten state is
It is expanded by the pressing force of 11, and is spread over the entire molding surface 16 of the lower die 12.

At the time of the above-mentioned molding, the heat-resistant elastic land body 20 fixed to the side land part 18 has a first shape depending on the thickness of the skin layers 24 and 24a.
In the case of deformation as shown in FIG. 2 or FIG. 2 and a thin skin layer as shown in FIG.
Gap between narrows the D _1, also intended thick skin layer as shown in FIG. 2 24a the land 20 and the inner surface land portion
The gap between the 17 spread and D _2. Thereby, even if the base material 21 is in a semi-molten state, it is blocked by the upper end of the heat-resistant elastic land body 20 and flows out of the molding surfaces 15, 16 even when the thickness is different from the skin layers 24, 24a. Never do.

In each of the above embodiments, a silicon rubber material was used as the elastic body of the heat-resistant elastic land body 20.However, remarkably high-temperature heat resistance is not required, and particularly high elasticity is not required. The material is not limited, and a urethane rubber material or the like can be used.

In the above embodiment, the change in the thickness of the skin layer is absorbed by the elasticity of the heat-resistant elastic land itself, but the range that can be absorbed is up to about 30% of the thickness of the heat-resistant elastic land.
If the difference is larger than this, it is possible to cope with the problem by interposing a shim between the land portion of the press die and the heat-resistant elastic land body.

Also, when there is a difference in dimensions or a design change that cannot be handled by the shim, it can be handled by preparing and exchanging a plurality of sets of heat-resistant elastic lands, and the upper and lower dies can be commonly used.

Although the base material is directly placed on the lower mold, the base material may be placed after the skin layer is disposed on the lower mold. In this case, it is necessary to provide a step portion and a heat-resistant elastic land body on the upper mold. Further, if necessary, the heat-resistant elastic land body may be provided on both the upper mold and the lower mold.

<Effect of the Invention> As described above, the press mold of the present invention is a cold press mold for producing a composite formed body composed of a skin layer and a base layer,
Since a heat-resistant elastic land body is fixed to the opposing side land portions in the upper and lower dies of the press die, a plurality of sets of press dies are prepared respectively according to the difference in the thickness of the skin layer in the product. It is not necessary, and it is not necessary to cut the land portion of the press die or pile up meat.

In addition, even if the dimensions are close to the basic dimensions and even if there is a slight design change, the difference in dimensions can be reduced by interposing shims on the heat-resistant elastic land body or preparing and replacing multiple sets. It can be absorbed and can also be used as a vertical type.

Therefore, according to the present invention, the manufacturing cost of the press die can be significantly reduced, and the storage space for the press die has a great advantage such as a small area. In addition, there is an effect that it can be manufactured in a short time when an urgent need such as a design change is required.

[Brief description of the drawings]

1 and 2 are enlarged cross-sectional views of a main part of an embodiment of the present invention.
FIG. 1 is a sectional view of a conventional press die, and FIG. 1, 11 ... upper mold, 2, 12 ... lower mold, 3, 21 ... base material, 4, 24 ... skin layer, 5, 6, 15, 16 ... molding surface, 7, 8, 17 , 18 ... side land, 19 ... step, 20 ... heat-resistant elastic land, 22 ... skin material, 23 ... cushion material.

Continued on the front page (72) Inventor Sadayoshi Mase 2100 Endo, Fujisawa-shi, Kanagawa Pref. In Fujisawa Plant, Press Industry Co., Ltd. (72) Inventor Eiji Takeuchi 2100, Endo in Fujisawa-shi, Kanagawa Pref. 72) Inventor Kenichi Ito 33 Onna, Atsugi-shi, Kanagawa Pref. (72) Inventor Harumi Ushiki 33 Onna, Atsugi-shi, Kanagawa Pref. 60-147311 (JP, A) JP-A 62-181114 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B29C 33/00-33/76 B29C 43/00- 43/58

Claims (1)

(57) [Claims] 1. A cold-press mold for producing a composite molded body comprising a skin layer and a base material layer, wherein a heat-resistant elastic land body is fixed to opposing side land portions in upper and lower molds of the press mold. A mold for cold press.