JP5835939B2 - Metal insert molded product, portable terminal equipped with the same, and metal insert molding method - Google Patents

Description

  The present invention relates to a metal insert molded article, a portable terminal including the metal insert molded article, and a metal insert molding method.

  Conventionally, a metal insert molded product in which the outer periphery of a sheet metal is wrapped with a resin is known. For example, in Patent Document 1, a casing of a mobile device is configured by integrally molding a resin exterior body on a metal structure. Since this metal structure is formed as a pair so that the resin sheathing body occupies the periphery uniformly, the shrinkage rate of the metal is smaller due to the difference in thermal expansion between the metal and the resin. It is known that the box-shaped metal structure and the resin sheathing body are brought into close contact with each other due to the shrinkage.

JP 2009-117863 A

  By the way, in the conventional metal insert molded product, the whole casing may be warped due to shrinkage during cooling. In Patent Document 1 described above, the bottomed concave shape is used so that the metal structure overcomes the shrinkage stress and the deformation after molding is minimized.

  However, when the rigidity of the metal structure is increased in order to overcome the shrinkage stress, there is a problem that the mass increases accordingly, the mass of the entire mobile terminal increases, and the portability decreases.

  This invention is made | formed in view of this point, The place made into the objective is to obtain the lightweight insert molded product which can prevent the deformation | transformation of the sheet metal by shaping | molding shrinkage | contraction.

  In order to achieve the above object, according to the present invention, the sheet metal is provided with a linear slit for reducing molding shrinkage.

Specifically, in the first invention,
Assuming a metal insert molded product in which the outer periphery of the sheet metal is wrapped with resin,
The sheet metal is formed with linear slits that relieve molding shrinkage that shrinks when the molten resin filled in the cavity of the mold is cooled and solidified.

  According to said structure, the curvature which arises in a sheet metal by shaping | molding shrinkage | contraction can be escaped with a linear slit, without improving rigidity. For this reason, a sheet metal can be made thin and the mass of a metal insert molded product becomes light compared with the past.

In the second invention, in the first invention,
The linear slit includes at least a first straight portion extending in the longitudinal direction of the sheet metal and a second straight portion extending in the width direction of the sheet metal.

  According to said structure, since the bending in the width direction is relieved by the 1st linear part and the bending in the longitudinal direction is relieved by the 2nd straight part, the curvature by the shrinkage | contraction of the longitudinal direction and the width direction of sheet metal is effective. Is prevented.

In the third invention, in the second invention,
The first straight part and the second straight part intersect each other.

  According to said structure, the curvature by the shaping | molding shrinkage | contraction of the longitudinal direction and the width direction of a sheet metal can be more effectively prevented in cooperation with a 1st linear part and a 2nd linear part.

In a fourth invention, in any one of the first to third inventions,
The sheet metal is a stainless steel sheet having a thickness of 0.10 or more and 0.15 mm or less.

  According to the above configuration, it is possible to mold even a stainless sheet of 0.15 mm or less which is likely to be warped due to molding shrinkage, which was impossible in the past. On the other hand, if it is thinner than 0.10 mm, the rigidity of the metal insert molded product itself is too low, which is not preferable.

A portable terminal according to a fifth aspect includes the metal insert molded product according to any one of the first to fourth aspects,
A metal reinforcing frame is arranged on the back side of the metal insert molded product.

  According to the above configuration, since the metal reinforcing frame compensates for the rigidity of the sheet metal portion that has been reduced by providing the linear slit, the rigidity of the entire mobile terminal does not decrease.

In the sixth invention, on the premise of a metal insert molding method of wrapping the outer periphery of the sheet metal with resin,
The molding method is
Forming a linear slit in the sheet metal,
Fit the sheet metal formed with the linear slit into the cavity of the mold,
Pour molten resin into the cavity into which the sheet metal is fitted,
A configuration in which molding shrinkage that shrinks when the molten resin is cooled and solidified is released by the linear slit.

  According to the above configuration, since a linear slit is formed together with a conventional through-hole in the sheet metal, the number of processes is not increased, and by providing this linear slit, distortion generated in the sheet metal due to molding shrinkage is eliminated. Therefore, a sheet metal can be made thin and a lightweight metal insert molded product is obtained.

  As described above, according to the present invention, a lightweight insert molded product that can prevent deformation of the sheet metal due to molding shrinkage by reducing the molding shrinkage by providing a linear slit in the sheet metal. can get.

It is a perspective view which shows the 1st cabinet which concerns on embodiment. It is the perspective view which looked at the slide type cellular phone in the closed state from the front. It is the perspective view which looked at the slide type mobile phone in the open state from the front. It is the perspective view which looked at the slide type mobile phone in the open state from the back. It is the VV line expanded sectional view of FIG. It is a disassembled perspective view which shows the main components by the side of the 1st housing | casing. It is the VII-VII sectional view taken on the line of FIG. It is a perspective view which shows a stainless steel sheet. FIG. 6 is a view corresponding to FIG. 1 according to another embodiment.

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

  2 to 4 show a sliding mobile phone 1 as a mobile terminal provided with a metal insert molded product according to an embodiment of the present invention. The sliding mobile phone 1 has a display unit 2 on the surface side. When the casing 3 is in a closed state (shown in FIG. 2) overlapping the second casing 5 having the operation unit 4 below the surface, the first casing 3 slides on the second casing 5. Thus, it is configured to be switchable between an open state (shown in FIGS. 3 and 4) in which the operation unit 4 of the second housing 5 is exposed. For convenience of explanation, the longitudinal direction (sliding direction) of the first housing 3 is the vertical direction, and the width direction is the horizontal direction.

  As shown in FIGS. 5 and 6, the first housing 3 is slidably connected to the second housing 5 via a slide mechanism 10. The slide mechanism 10 includes a slider 11 attached to the front side of the second housing 5 and made of a press-formed product of, for example, a stainless steel plate. The slider 11 has a rectangular sheet metal shape, and includes an engaging portion 12 whose left and right end portions are bent to the front side to have an L-shaped cross section as shown in FIG.

  On the other hand, as shown in FIG. 6, the 1st housing | casing 3 has the 1st cabinet 30 which is the metal insert molded product mentioned later, and comprises the display part 2 on the surface side of this 1st cabinet 30, for example. The LCD panel 2a, the LCD cushion 2b, and the LCD unit 2c are fitted. On the back surface of the first cabinet 30, a rectangular plate-like back plate 20 as a metal reinforcing frame made of a magnesium alloy molded product or the like is fastened by screws 20a. Resin covers 20b and 20c for hiding the first substrate 6 and the like are attached to the upper and lower sides of the back plate 20, respectively. As shown in FIG. 5, the left and right end portions of the back plate 20 are bent outward in an L-shaped cross section to form rail portions 21. The rail portion 21 constitutes a part of the slide mechanism 10, the engaging portion 12 of the slider 11 is engaged with the rail portion 21, and the slider 11 can slide up and down along the rail portion 21.

  As shown in FIG. 1, the first cabinet 30 is insert-molded so that the outer periphery of a stainless steel sheet 31 as a sheet metal is wrapped with a resin frame 32 such as a fiber-reinforced polyamide resin. The stainless steel sheet 31 is made of stainless steel having a wall thickness of, for example, 0.10 or more and 0.15 mm or less, but is not necessarily made of stainless steel, and may be a high-tensile steel plate or the like. If the thickness of the stainless steel sheet 31 is less than 0.10 mm, the rigidity of the first cabinet 30 itself is undesirably lowered. The stainless steel sheet 31 is formed with linear slits 33 that relieve molding shrinkage that shrinks when the molten resin filled in the cavity (not shown) of the mold is cooled and solidified. The stainless steel sheet 31 has a large number of through holes 31b in addition to the linear slits 33. However, the through holes 31b are not continuous like the linear slits 33, and the length thereof is the linear slits 33. Is shorter.

  In the present embodiment, the linear slit 33 includes a first straight portion 33 a extending in the longitudinal direction (vertical direction) of the stainless steel sheet 31 and a second straight portion 33 b extending in the width direction (left and right direction) of the stainless steel sheet 31. The first straight part 33a and the second straight part 33b intersect perpendicularly. As shown in FIG. 6, the rigidity of the portion of the stainless sheet 31 that has decreased due to the provision of the linear slits 33 compensates for the back plate 20 so that the rigidity of the sliding mobile phone 1 as a whole decreases. Absent.

-Molding method of the first cabinet-
Next, a method for forming the first cabinet 30 according to the present embodiment will be described.

  First, for example, a 0.15 mm flat stainless steel sheet 31 is prepared, and as shown in FIG. 8, a linear slit 33 is formed by pressing together with a peripheral bent portion 31a and another through hole 31b. At this time, the linear slit 33 and the other through-holes 31b may be cut out with a laser, and then pressed so as to be bent while removing burrs with a press. In this manner, if the linear slit 33 is formed in the stainless steel sheet 31 together with the conventional through hole 31b, the number of processes is not increased.

  Next, although not shown in detail, the stainless steel sheet 31 on which the linear slits 33 are formed is fitted into the mold cavity.

  Next, a molten resin such as polyamide containing reinforcing fibers is poured into the cavity in which the stainless steel sheet 31 is fitted.

  Next, the molten resin is cooled and solidified. At this time, molding shrinkage that shrinks when the molten resin solidifies is released by the linear slit 33. Since the 1st linear part 33a and the 2nd linear part 33b are connected, the curvature by the shaping | molding shrinkage | contraction of the longitudinal direction and the width direction of the stainless steel sheet 31 can be prevented further effectively in cooperation with both.

  Finally, the first cabinet 30 is taken out from the mold, and the molten resin is completely cooled to become the resin frame 32, whereby the first cabinet 30 free from bending due to molding shrinkage is obtained.

  By providing this linear slit 33, distortion generated in the stainless steel sheet 31 due to molding shrinkage can be eliminated, so that the stainless steel sheet 31 can be made thin and the light first cabinet 30 can be obtained.

  Thus, in this embodiment, the curvature which arises in the stainless steel sheet 31 by shaping | molding shrinkage | contraction can be escaped by the linear slit 33, without raising rigidity. For this reason, insert molding is possible even with a stainless steel sheet having a thickness of 0.15 mm or less that is likely to be warped due to molding shrinkage, which has been impossible in the past, and thus the mass of the first cabinet 30 becomes lighter than in the past. Therefore, according to the present embodiment, the lightweight first cabinet 30 can be obtained by preventing deformation of the stainless steel sheet 31 due to molding shrinkage.

(Other embodiments)
The present invention may be configured as follows with respect to the above embodiment.

  That is, in the said embodiment, although the 1st linear part 33a and the 2nd linear part 33b cross | intersect perpendicularly, as shown in FIG. 9, in the 1st cabinet 130, the 1st linear part 133a and the 2nd You may arrange | position so that it may each divide | segment at the center, without making the linear part 133b cross. In this case, since the strength is not lowered more than necessary at the central portion, it is also suitable for a case where a metal reinforcing frame such as the back plate 20 cannot be disposed in the immediate vicinity. Since the first linear portion 133a reduces the bending in the width direction and the second linear portion 133b reduces the bending in the longitudinal direction, warping due to molding shrinkage in the longitudinal and width directions of the stainless sheet 131 is effectively prevented. The

  In the above embodiment, the mobile terminal is the sliding mobile phone 1, but is not limited to the sliding mobile phone, and is not limited to the sliding mobile phone, but a folding mobile phone that folds the first housing and the second housing or the first housing. A mobile phone consisting only of the body may be used. The portable terminal may be a PHS (Personal Handy-phone System), a PDA (Personal Digital Assistant), a smartphone, a personal computer, a mobile tool, an electronic dictionary, a calculator, a game machine, or the like.

  In addition, the above embodiment is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or a use.

1 Sliding mobile phone (mobile terminal)
20 Back plate (metal reinforcement frame)
30 First cabinet (metal insert molding)
31 Stainless steel sheet 33 Straight slit 33a First straight portion 33b Second straight portion 133 Straight slit 133a First straight portion 133b Second straight portion

Claims (7)

In a metal insert molded product in which the outer periphery of the sheet metal is wrapped with resin,
A metal insert molded product, characterized in that a linear slit is formed on the flat surface of the sheet metal to prevent bending of the metal insert molded product during molding. In the metal insert molded article according to claim 1,
The said linear slit is provided with the 1st linear part extended in the longitudinal direction of a sheet metal at least, and the 2nd linear part extended in the width direction of this sheet metal, The metal insert molded product characterized by the above-mentioned. In a metal insert molded product in which the outer periphery of the sheet metal is wrapped with resin,
The sheet metal is formed with a linear slit that prevents the metal insert molded product from being bent during molding.
The linear slit includes at least a first linear portion extending in the longitudinal direction of the sheet metal and a second linear portion extending in the width direction of the sheet metal,
The metal insert molded product characterized in that the first straight portion and the second straight portion intersect. In the metal insert molded product according to any one of claims 1 to 3,
The sheet metal is a stainless steel sheet having a wall thickness of 0.10 or more and 0.15 mm or less. The metal insert molded product according to any one of claims 1 to 4,
A mobile terminal, wherein a metal reinforcing frame is disposed on the back side of the metal insert molded product. In the metal insert molding method of wrapping the outer periphery of the sheet metal with resin,
Forming a linear slit to prevent the bending of the sheet metal during molding on the flat surface of the sheet metal ,
Fit the sheet metal formed with the linear slit into the cavity of the mold,
Metal insert molding wherein the write non <br/> be flowing molten resin inside the cavity in which the sheet metal is fitted. In the metal insert molding method of wrapping the outer periphery of the sheet metal with resin,
The sheet metal is provided with at least a first straight line portion extending in the longitudinal direction of the sheet metal and a second straight line portion extending in the width direction of the sheet metal and intersecting the first straight line portion to prevent bending of the sheet metal during molding. Form a linear slit to
Fit the sheet metal formed with the linear slit into the cavity of the mold,
The molten resin is poured into the cavity in which the sheet metal is fitted.
The metal insert molding method characterized by the above-mentioned.

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