JPS5938245Y2 - L-shaped bent structure of metal sheet metal - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement in the L-shaped bent structure of a metal sheet metal.

Generally, it is known that a large number of metal parts are attached to both upper and lower surfaces of a metal sheet metal, such as a chassis for a cassette tape recorder.

However, due to the structure of such a product, when an L-shaped piece is formed in a part of the metal sheet metal, and other parts such as a reel shaft for a cassette tape recorder are attached to this L-shaped piece, for example, The squareness and strength of the L-shaped tongue portion are required.

However, conventionally, the L-shaped tongue part is formed by press bending a part of a metal sheet metal made of rolled steel, so due to the thickness error of the metal sheet metal, the L-shaped tongue part is It is extremely difficult to form the right angle with good precision, and the tortoise-shaped tongue portion is supported in a cantilevered manner.For this reason, if the thickness of the metal sheet metal is thin, there are problems in terms of strength depending on the purpose of use.

By the way, recently, molded products of a single shape are integrally molded with synthetic resin on both the upper and lower surfaces of a metal sheet metal, and these molded products are used as a substitute for metal parts attached to the metal sheet metal. something is being developed.

However, if the L-shaped bent part, which requires perpendicularity and strength, is made of synthetic resin as described above, the synthetic resin must be made thicker for strength, resulting in longer molding cycles and higher costs. Furthermore, if only the synthetic resin is used, its shrinkage will adversely affect the squareness, and it is extremely difficult to make the L-shaped piece at a right angle with high accuracy.

The present invention has been made in view of the above circumstances, and is made by molding an L-shaped piece formed by press bending on a part of a metal sheet metal and a press cut portion of the metal sheet metal with synthetic resin, respectively. By forming a resin coating having a thickness of The purpose is to provide

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a metal sheet, on a part of which an L-shaped piece 2 is erected by press bending.

However, by injection molding using a well-known mold, the second
As shown in FIGS. 3 and 3, the L-shaped tongue portion 2 and the press cut portion 3 of the metal sheet metal 1 (see FIG. 1) are molded with a synthetic resin 4.

This molding is carried out so that a resin film of a predetermined thickness is formed on each of the L-shaped piece portion 2 and the press cut portion 3, and the L-shaped piece portion 2 and the press cut portion 3 are covered with the resin film.

Since the L-shaped tongue piece part 2 is molded with the synthetic resin 4 in this way, the relationship between the plate thickness error of the metal sheet metal 1 and the up-shaped tongue piece part 2
Even if it is not possible to make the L-shaped piece 2 at a right angle with high precision, the synthetic resin 4 molded onto the L-shaped piece 2 can make the entire L-shaped piece 2 at a right angle with good precision.

Further, since the contraction of the synthetic resin 4 is limited by the L-shaped piece 2, the contraction of the synthetic resin 4 does not have a negative effect on the right angle dust.

Further, since the L-shaped piece 2 and the press cut portion 3 of the metal sheet metal 1 are molded with the synthetic resin 4, even if the metal sheet metal 1 is thin, there is no deterioration in strength.

Furthermore, due to the presence of the L-shaped piece 2, even if the thickness of the synthetic resin 4 itself is made thinner, the strength will not deteriorate, and therefore the entire L-shaped piece 2 can be made of only synthetic resin. In comparison, the molding cycle can be shortened.

In addition, if the L-shaped piece 2 is blown by the injection pressure during molding, as shown in FIG. If the two protrusions 5.5 are clamped from both sides in the mold and molded, the L-shaped piece 2 will not be blown out.
The entire L-shaped piece 2 can be squared with high accuracy.

As mentioned above, the L-shaped bent structure of the metal sheet metal according to the present invention is an L-shaped bent part structure formed on a part of the metal sheet metal by press bending.
Since the L-shaped piece and the press-cut portion of the metal sheet are molded with synthetic resin and a resin coating of a predetermined thickness is formed on each, the entire L-shaped piece is molded with the synthetic resin. It can be made at right angles with high precision, and even if the metal sheet is thin, the strength will not deteriorate, and even if the synthetic resin itself is made thinner, the strength will not deteriorate. Compared to a structure in which the entire L-shaped piece is made of only synthetic resin, the molding cycle can be shortened and costs can therefore be reduced.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an example of the material used in the present invention, Fig. 2 is a perspective view of an embodiment of the present invention, and Fig. 3 is a perspective view of an example of the material used in the present invention.
FIG. 4 is a longitudinal sectional view taken along the -In line, and is a longitudinal sectional view similar to FIG. 3 of another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...Metal sheet metal, 2...L-shaped piece part, 3...Press cut part of metal sheet metal, 4...Synthetic resin, 5...Protrusion.

Claims (1)

[Scope of utility model registration request] A part of the metal sheet metal is pressed and bent to form an L-shaped piece, and this L-shaped piece and the press-cut part of the metal sheet are molded in synthetic resin, and each is made to a predetermined thickness. An L-shaped bent structure of a metal sheet metal, characterized by forming a resin coating.