JP2529991B2 - Stamping mold and method for treating the edge of skin - Google Patents

Description

TECHNICAL FIELD The present invention relates to the present invention, a stamping molding die, and a method for treating an end of a skin, and more specifically, it is used for molding a molded article to be used for an interior part of an automobile or the like. The present invention relates to a stamping molding die for integrally molding a core material and a skin, and a method for treating a skin end portion of a molded product.

[Problems to be Solved by Prior Art and Invention]

BACKGROUND ART Conventionally, for automobile interior parts and the like, a resin material serving as a core material and a skin such as a cloth have been integrally formed by stamping. The processing of the end portion of the molded product at the time of stamping molding is performed by folding back the skin inside the core material and welding the core material and the skin, but manual processing is required when folding back. I was there. However,
As an improved method of conventional end processing of stamping molding,
In most cases, a method of cutting the skin in the mold is used, or a method of fixing the end part to facilitate folding back after molding is used, and in all cases, a manual post-treatment process cannot be avoided. It was

[Means for solving the problem]

Therefore, the present inventors have solved the above-mentioned problems of the conventional technology,
We have conducted intensive research to develop a stamping mold and a method for treating the edge of the skin that allows the end of the skin during stamping to be easily and continuously performed without manual work. As a result, they have found that these conditions can be achieved by using a specific stamping molding die and performing stamping molding by a specific procedure, and have completed the present invention.

That is, according to the present invention, a pair of molds including a male mold arranged on the core side and a female mold on the skin side integrally molded on the surface of the core, and a mold arranged on the outer periphery of the mold. A cutting blade that cuts the end of the skin, an ejector pin that projects from the male mold and presses the molded product against the female mold, and a part that projects inward from the side of the mold to form the end of the skin (EN) A stamping molding die, comprising: a push-in pin that is pushed inward of an article; and a heater that welds an end of a skin pushed by the push-in pin to the inner surface side of a core material. As a core material and a skin are integrally formed by placing a core material on the male side of a stamping molding die including a male die and a female die and disposing a skin on the female die side, and at the outer peripheral portion of the die. Cut the edge of the epidermis to a predetermined width, then open the male and female Supporting the molded product to the female mold side, the end of the skin is folded back inside the molded product, both molds are closed again, and the folded back end of the skin is molded by the male mold. The present invention provides a method for treating an end portion of a skin, which is characterized in that the end portion of the skin and the core material are folded back along the inner surface of the sheet and welded by a heater provided on the outer periphery of the male mold.

In the present invention, as the material to be stamped and formed, the same material as the conventional one can be used. For example, the skin is ethylene propylene rubber, vinylidene chloride backed by a cotton cloth, a combination skin of vinylidene chloride and a foam layer, the foam layer is a propylene foam or polyurethane foam, preferably propylene or linear low-density polyethylene, Alternatively, it is desirable to use a backing made of modified propylene or polyethylene that has adhesiveness.

The core material is the base material of the molded product, and is reinforced with molten resin such as polypropylene, or inorganic filler such as glass, mica, talc, calcium carbonate, barium sulfate, etc., wood powder, and organic fiber. Polypropylene material is used. In addition, as the thermosetting resin, SMC or BMC material such as unsaturated polyester, unsaturated polyester reinforced with glass, talc or the like, phenol resin, polyurethane, or those reinforced with felt or glass fiber may be used.

In the present invention, the above-mentioned skin and core material are used as a raw material, and this is molded according to the mold and molding method. 1 to 4 are cross-sectional views of essential parts showing an example of the mold of the present invention. Hereinafter, the present invention will be described in more detail with reference to the drawings.

The stamping molding die 1 comprises a male die 2 and a female die 3. The male die 2 is provided with an ejector pin 4 and a heater 5, and the female die 3 has a cutting blade 6 and a pushing pin 7.
Is provided.

The ejector pin 7 of the male mold 2 is a member that protrudes from the male mold 2 and presses the molded product 8 toward the female mold 3 side. Depending on the size of the molded product 8 and the like, an appropriate number of ejector pins 7 can be used. It is provided. Further, the heater 5 is for welding the skin 9 to the core material 10, and is provided at an appropriate interval or continuously on the outer peripheral portion of the male mold 2 depending on the welding position of the skin end portion 9A.

On the other hand, the cutting blade 6 of the female die 3 cuts the epidermis 9 to an appropriate length and is provided at least over the entire width of one side of the female die 3. The push-in pin 7 pushes the skin 9 extending from the end of the core material 10 toward the inside of the core material 10, that is, the back side 10A side. The shape of the molded product 8 and the elasticity of the skin 9 are high. It is provided in an appropriate shape in an appropriate number or over the entire width.

Next, the operation and molding procedure of the mold 1 will be described below. That is, first, FIG. 1 shows the male type 2
The core material 10 and the skin 9 are set at predetermined positions with the female mold 3 and the female mold 3 opened, and the molds 2 and 3 are closed to integrally mold the core material 10 and the skin 9 into a predetermined shape. At this time, the cutting blade 6, the ejector pin 4, the pushing pin 7 and the heater 5 are not operating.

Next, as shown in FIG. 2, the cutting blade 6 is actuated to move the skin 9
Disconnect. The operation of the cutting blade 6 is formed such that when the mold 1 is closed, the cutting blade 6 advances in conjunction with this, and when the mold 1 is opened, the cutting blade 6 is retracted by the force of the spring 11.
At the cutting position, the skin 9 is longer than the core material 10,
That is, the outer skin 9 is set to be cut while leaving a length required to fold it back to the back surface 10A side of the core material 10.

After cutting the epidermis 9, the male mold 2 and the female mold 3 are opened as shown in FIG. At this time, the ejector pin 4 projects from the male die 2 and presses the molded article 8 toward the female die 3 side to support it. When the male mold 2 is sufficiently separated from the molded product 8, the push-in pin 7 of the female mold 3 operates. The operation of the push-in pin 7 is performed by a driving device 12 such as an air rod cylinder or a hydraulic or electromagnetic boss coil. As the push-in pin 7 advances, the outer skin 9 is pushed inward of the core material 10 and its end 9A
Is located inward of the back surface 10A of the core 10.

Further, the push-in pin 7 is retracted, and both molds 2 and 3 are closed again as shown in FIG. At this time, the end portion 9A of the outer skin 9 pushed inward of the core material 10 is folded back along the back surface 10A of the core material 10 by the male die 2, and between the back surface 10A of the core material 10 and the male die 2. Sandwiched. In this state, the heater 5 of the male mold 2 is energized to heat the end portion 9A of the outer skin 9 and welded and fixed to the back surface 10A of the core material 10.

After welding, open both molds 2 and 3 and take out the molded product 8.
The end portion 9A of the outer skin 9 is folded back and welded to the back side of the core material 10 to form a finished product.

In this way, the molding of the molded product consisting of the core material and the skin can be continuously performed by opening and closing the mold and operating the pins, so that the product can be obtained without any manual work. , The productivity of this kind of product can be greatly improved.

In addition, since no manual work is performed, variations in products due to the skill level of workers are eliminated, and stable quality products can be provided at low cost.

The structure of the mold, the shape of various pins, and the operating means are appropriately determined according to the shape of the molded product, the core material, and the type of the skin, and are not limited to the above-described means.

〔The invention's effect〕

INDUSTRIAL APPLICABILITY As described above, the present invention is capable of continuously performing a series of steps of folding and welding and fixing the end portion of the skin during the stamping molding for integrally molding the skin on the surface of the core material. Can be greatly improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a main part of a stamping molding die of the present invention. FIG. 1 is a state during molding, FIG. 2 is a state during cutting of a skin, and FIG. 3 is a state during pushing in of a skin. FIG. 4 shows the states when the epidermis is welded. 1: Stamping mold, 2: Male mold, 3: Female mold, 4: Ejector pin, 5: Heater, 6: Cutting blade, 7: Push pin, 8: Molded product, 9: Skin, 9A: Edge of skin Part, 10: core material, 10A: back side of core material, 11: spring, 12: drive unit

Claims (2)

(57) [Claims] 1. A pair of molds comprising a male mold arranged on the core material side and a female mold on the skin side integrally molded on the surface of the core material, and arranged on the outer peripheral portion of the mold. A cutting blade that cuts the end of the skin, an ejector pin that projects from the male mold and presses the molded product against the female mold, and a part that projects inward from the side of the mold to form the end of the skin A stamping molding die, comprising: a push-in pin that is pushed inward of an article; and a heater that welds an end of a skin pushed by the push-in pin to an inner surface side of a core material. 2. A stamping molding die comprising a male die and a female die, wherein a core material is disposed on the male die side and a skin is disposed on the female die side to integrally mold the core material and the epidermis. Cut the end portion of the outer skin to a predetermined width at the outer peripheral portion, then open the male mold and the female mold and support the molded product on the female mold side, fold the end part of the outer skin inward of the molded product, and again. Closing both molds, the end of the folded back skin is further folded back along the inner surface of the molded product by a male mold, and the end of the skin and the core material are welded by a heater provided on the outer periphery of the male mold. A method for treating the edge of the epidermis, characterized by: