JP2000176623A - Formation of thin metallic parts, metallic mold device and housing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a forming method of the metallic parts, with which the defective formation of the entrapment of air, etc., is not generated in the back part side of a projecting portion formed in a metallic mold, a metallic mold device and a having device. SOLUTION: Relating to the metallic mold device 30 having a cavity 35 from which molten metal is introduced on the jointing surface of a first mold 31 and a second mold 32, the divided flow members 37, 38 projectingly formed with a prescribed gap from the inner wall surface of the first mold 31 or the inner wall surface of the second mold 32 toward the second inner wall surface or the first wall surface, are arranged in the inner part of the cavity 35.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for forming a thin metal part by a die casting method and a thixo molding method.

[0002]

2. Description of the Related Art When a thin metal part is formed by a die casting method or a thixomolding method, the metal has a high thermal conductivity, cools instantaneously, rapidly increases in viscosity, and does not flow. For this reason, it is necessary to fill the cavity with the molten metal before the molten metal loses its fluidity, so that the molten metal is poured at a high speed.

[0003]

Here, when the flow velocity in the cavity becomes about 10 m / s or more, the inertial force becomes more dominant than the viscous force, and the inertial force of the molten metal flowing in the cavity becomes extremely strong. . Therefore, at the projecting portion of the mold, no molten metal is filled at the downstream side in the direction in which the molten metal flows, for example, near the gate, and after the molten metal reaches the inside of the cavity (air vent side), It swirls around the part and flows into it. As a result, on the downstream side of the protruding portion in the direction in which the molten metal flows, air is entrained and causes voids and weld lines.

[0004] Therefore, the molding is performed without forming a hole at the time of molding, and the hole is formed by machining after the molding, so that the cost is high.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a thin metal part which does not cause molding defects such as air entrapment behind a protruding portion formed in a mold. An object is to provide a molding method, a mold device, and a housing device.

[0006]

According to a first aspect of the present invention, a cavity for introducing a molten metal is formed in a joining surface between a first mold and a second mold. In the mold apparatus, a protrusion is formed inside the cavity from the inner wall surface of the first die or the inner wall surface of the second die toward the second inner wall surface or the first inner wall surface with a predetermined gap. The mold device is provided with a divided flow device.

According to a second aspect of the present invention, a thin wall having a hole is formed by forming a cavity in which a molten metal is introduced in a joining surface of the first mold and the second mold, and a projection is provided in the cavity. In a mold apparatus capable of molding a metal part, a predetermined interior of the cavity extends from the inner wall surface of the first mold or the inner wall surface of the second mold to the second inner wall surface or the first inner wall surface. A mold device comprising a flow dividing means protruding with a gap provided.

According to a third aspect of the present invention, the branching means includes:
A portion of the streamline vector of the molten metal flowing inside the cavity is located at a position inside the peripheral wall portion of the cavity and the portion where the molten metal is slowly filled when there is no equal dividing means, the peripheral wall portion of the cavity is The mold apparatus according to claim 1 or 2, wherein the mold apparatus is provided so as to be guided so as to flow before the metal is entirely filled with the molten metal.

According to a fourth aspect of the present invention, the branching means includes:
A part of the streamline vector of the molten metal flowing inside the cavity is located at a position inside the peripheral wall of the cavity and a portion where the molten metal is slowly filled when there is no equal flow dividing means, The mold apparatus according to claim 1 or 2, wherein the sum of the scalar obtained by integrating the flows along the cavity is provided so as to be shorter than at least a part of the cavity peripheral wall portion.

According to a fifth aspect of the invention, the gap between the projecting end of the flow dividing means and the inner wall surface of the cavity is formed to be approximately 25% or less of the interval between the cavities. A mold apparatus according to any one of claims 1 to 4.

According to a sixth aspect of the present invention, a cavity is formed in a joining surface of the first mold and the second mold, and a molten metal is introduced into the cavity to form a thin metal part. In the method, a part of the molten metal introduced into the cavity is caused to collide with a flow dividing means protruding from the inner wall surface of the cavity to be divided into two directions at a predetermined angle to fill the cavity with the molten metal. A method of forming a thin metal part, comprising the steps of:

According to a seventh aspect of the present invention, there is provided a thin metal part having a hole formed by forming a cavity having a projecting portion in a joining surface of the first mold and the second mold, and introducing a molten metal into the cavity. In the method for forming a thin metal part, a traveling direction of the molten metal introduced into the cavity and bypassing the projecting portion is made to collide with a flow dividing means projecting from the inner wall surface of the cavity to form a predetermined angle. The molten metal is divided into two directions and guided so that one direction of the divided molten metal goes to a position on the downstream side of the flow of the molten metal at the projecting portion before at least a part of the cavity peripheral wall portion. And filling the inside of the cavity.

According to an eighth aspect of the present invention, there is provided a thin metal part having a hole formed by forming a cavity having a projecting portion in a joining surface of the first mold and the second mold, and introducing a molten metal into the cavity. In the method for forming a thin metal part, a traveling direction of the molten metal introduced into the cavity and bypassing the projecting portion is made to collide with a flow dividing means projecting from the inner wall surface of the cavity to form a predetermined angle. Divided in two directions, one direction of the divided molten metal is guided at a position on the downstream side of the flow of the molten metal at the projecting portion so as to make the traveling distance shorter than at least a part of the cavity peripheral wall portion. A method for forming a thin metal part, comprising a filling step of filling molten metal into a cavity.

According to a ninth aspect of the present invention, there is provided a housing formed by joining a first housing member and a second housing member formed by injection molding to a mold device having a flow dividing means inside a cavity. In the apparatus, a hole shape is formed in the first or second housing member, and a position corresponding to the flow dividing means is provided on an inner surface of the first or second housing member. A case device characterized by being formed in a concave shape depressed from a portion.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is an external view showing the shape of a portable computer 10 such as a notebook personal computer. In this figure, a portable computer 10 includes a computer main body 11 and a display unit 12 rotatably supported by the computer main body 11. Further, the computer main body 11 includes a housing device 20. The housing device 20 includes a lower housing 21 and an upper housing 22.
Are joined together.

The lower housing 21 and the upper housing 22 are arranged as shown in FIG.
As shown in FIG. 7, the screw 23 is inserted through the boss 37, and the screw 23 is received by the projecting portion 24 protruding toward the inside of the housing so as to face the boss 37, thereby joining the two.

In order to provide such a housing device 20, a mold device 30 shown in FIG. 5 is used.

The mold apparatus 30 has a first mold 31 and a second mold 32.
Is formed. The mold apparatus 30 is provided with a sprue 33 serving as an inlet for the molten metal, and a runner 34 for guiding the introduction of the molten metal into the interior of the mold apparatus 30 and guiding the uniform diffusion of the molten metal. I have. The molten metal guided by the runner 34 is guided to a cavity 35 inside the mold device 30.

The molten metal is, for example, a magnesium alloy. Alternatively, for example, an aluminum alloy may be used.

The cavity 35 is provided with a protruding portion 36 for forming a hole in the housing device 20. Thereby, when the first mold 31 and the second mold 32 are engaged with each other, the first cavity of the cavity 35 formed by the engagement is formed.
Between the opposed inner wall surfaces of the mold 31 and the second mold 32,
A projecting portion 36 is provided. This projecting portion 36
The shape is arranged in a direction from the runner 34 to an air vent 39 described later.

As shown in FIG. 5 and FIG.
Is formed so as to come into contact with the inner wall surface of the second mold 32 when is formed from the first mold 31. The flow of the molten metal collides with the projecting portion 36, and the direction of the flow is changed.

Here, on the inner wall surface of the cavity 35, there are flow dividing members 37, 3 formed so as to be substantially linear.
8 are provided. Also, the flow dividing members 37 and 38
Is formed so as to have a substantially rectangular cross-sectional shape, but may have another cross-sectional shape as long as it has an action of changing the flow of the molten metal up to that time.

The flow dividing members 37 and 38 are provided in the cavity 3.
5 has a function as a dividing means for dividing the molten metal introduced into the inside, and the dividing members 37, 38
The direction of the flow of the molten metal flowing out toward is distributed. By the flow dividing members 37 and 38, the direction of the flow of the molten metal introduced into the cavity 35 at a high pressure and advanced by the inertial force is changed.

More specifically, the flow dividing members 37 and 38 are, for example, as shown in FIG.
It is formed to project in a predetermined length toward the direction. Then, the projecting end portions of the flow dividing members 37 and 38 and the second mold 3
A configuration is such that a predetermined gap exists between the inner wall surface and the second inner wall surface.

Here, as shown in FIG.
5 is set to a, and the second
Assuming that the distance to the inner wall surface of the mold 32 is b, in the present embodiment, the value of b with respect to the distance a of the gap is set to be about 25%. However, the gap may be set to be approximately 25% or less.
Here, at an interval of 25% or more, the ratio of the molten metal whose flow direction is changed is significantly reduced, and therefore, it is preferable to set it to about 25% or less.

The flow dividing members 37 and 38 generate a flow such that when the molten metal is divided, one of the molten metals flows into the portion A on the opposite side of the sprue 33 with the projecting portion 36 interposed therebetween. It is provided in. This part A
This is because, in this figure, the molten metal is the most difficult to flow, that is, it is a position where the molten metal is wound when flowing and flows into it to generate voids and the like.

In this case, as described above, the projecting portion 36 obstructs the flow of the molten metal and circumvents the flow of the molten metal, thereby changing the direction of the flow. Flow dividing member 37,
38 need to be provided. Here, in the following description, a streamline vector is taken along the flowing direction of the molten metal, and the description will be made based on the streamline vector.

The flow dividing members 37 and 38 need to be provided at positions where the stream line vector of the molten metal spreads as uniformly as possible throughout the cavity 35. Here, FIG.
As shown in (e), when no equally dividing members 37 and 38 are formed, this streamline vector is unlikely to flow into the portion A which is on the side of the air vent 39 opposite to the sprue 33 with the projecting portion 36 interposed therebetween. I have. Therefore, the trajectory of the streamline vector is changed so as to head toward the portion A, and the molten metal enters the portion A. By doing so,
The molten metal can enter the portion A in a short time.

Here, in FIG. 4 (FIG. 3), a point P is taken at a corner of the projecting portion 36, and a cross section is taken from this point P so as to block the flow of the molten metal. In FIG. 3, two sets of flow dividing members 37 and 38 are arranged.
A first set of flow dividing members 37 (hereinafter, referred to as first flow dividing members 37) in the arrangements of 7, 38 are positioned so as to change the direction of a stream line vector of a part of the molten metal. In this case, the first flow dividing member 37 is provided such that at least one end of the first flow dividing member 37 is located on the downstream side of the flow from the cross section of the flow from the point P.

The first flow dividing member 37 is arranged so as to be changed by a predetermined amount in a straight line vector in a predetermined direction.

More specifically, the stream line vector that has collided with the first flow dividing member 37 flows or rebounds along the first flow dividing member 37, thereby colliding with the first flow dividing member 37. The direction of the subsequent streamline vector may be directed toward the projecting portion 36 or in a direction parallel to the projecting portion 36.

As described above, in order to change the direction of a part of the streamline vector, the first branch member 37 is connected to the projecting portion 36.
Is oriented parallel to the sides of the
The downstream end of the flow dividing member 37 is provided closer to the projecting portion 36 than the upstream end.

A stream line vector generated by the first flow dividing member 37 and having a direction different from the conventional flow direction is directed to a second set of flow dividing members 38 (hereinafter referred to as a second flow dividing member 38). The second flow dividing member 38 is connected to the first flow dividing member 3.
It is provided so as to block the stream line vector whose direction has been changed by 7. The second flow dividing member 38 is configured to
When a point Q is taken at the corner on the downstream side of 6, and a section is taken from this point Q in a direction in which the flow of the molten metal is interrupted, the second flow dividing member 38 is provided downstream from this section. Have been.

When the molten metal collides with the second diverting member 38, the second diverting member 38 generates a flow of the molten metal again in a new direction, and a part of the molten metal flows. The line vector is arranged so as to be directed to the protruding portion 36 side of the portion A shown in FIG. Specifically, the second
The direction of the stream line vector after colliding with the flow dividing member 38 is
The direction is changed to the side of the protruding portion 36 on the side of the air vent 39 or to the direction parallel to the protruding portion 36. For this reason, the second flow dividing member 38 is disposed in a direction parallel to the side surface of the projecting portion 36 on the air vent 39 side, or faces the projecting portion 36 of the second flow dividing member 38. The opposite end portion is provided so as to gradually approach the protruding portion 36.

The first and second flow dividing members 37, 37
The molten metal whose flow has been guided by 38 spreads inside the cavity 35 and reaches an air vent 39 at the other end of the runner 34. The air vent 39 allows air existing inside the cavity 35 to escape from the inside of the cavity 35 to the outside, so that the molten metal introduced into the inside of the cavity 35 can prevent the generation of voids inside the inside of the cavity 35 while keeping the molten metal in the pool 40. It is configured to reach up to.

After the molten metal is cooled inside the cavity 35 for a predetermined time and the molten metal is completely solidified, the first mold 31 and the second mold 32 are disengaged from each other and opened.
Thereafter, a molded product formed by solidification is taken out of the cavity 35, and a portion corresponding to the runner 34 and the air vent 39 is cut out from the molded product, and the lower casing 21 is cut off.
(Or upper housing 22).

The lower housing 21 (or upper housing 2)
After taking out 2), a circuit board or the like is attached, and a display unit 12 or a display device such as an LED is connected and attached to the circuit board or the like. Then, the upper housing 22 is assembled to the lower housing 21 to form the housing device 20, and the display unit 12 and other disk drive devices are assembled to form the portable computer 10.

The mold apparatus 30 having the above-described configuration,
The housing device 20 and a method of manufacturing the housing device 20 will be described below.

After the first mold 31 and the second mold 32 are engaged with each other and a cavity 35 is formed therein, molten metal is introduced from a sprue 33 at a predetermined pressure. Then, the molten metal passes through the runner 34 and is introduced into the cavity 35. Here, the cavity 35
Is provided with a projecting portion 36, even if the molten metal is introduced at a high pressure, the molten metal collides with the presence of the projecting portion 36 and changes its traveling direction. There is no molten metal going to the shaded area. That is, as shown in FIG. 4B, the molten metal advances around the projecting portion 36 to have a state of inertia, and therefore, near the point P, the molten metal passes through the center of the sprue 33 and the center of the air vent 39. Attempts to proceed in a direction inclined by a predetermined angle with respect to the connecting line.

However, in order to change the direction of the stream line vector of the molten metal, a first branch member 37 is provided, and the stream line vector whose direction has been changed by the first branch member 37 is changed as shown in FIG. A second flow dividing member 38 is provided toward A. Therefore, these first
Of the flow dividing member 37 and the second flow dividing member 38,
The wraparound of the molten metal to the portion A is guided, and it is possible to prevent the molten metal from being filled while being swirled slower than other portions.

Then, as shown in FIGS. 3D and 3E, the vicinity of the air vent 39 is finally filled with the molten metal so that no air bubbles remain inside the cavity 35.

After the molten metal is filled in the cavity 35, the molten metal is cooled and solidified as a molded product.
The lower housing 21 (or the upper housing 22) in which the holes are formed is formed by cutting out the portions corresponding to the runners 9 and the runners 34.

The lower housing 21 and the upper housing 22
Are joined by joining means such as bolts, thereby forming the housing device 20.

According to the mold device 30, the casing device 20, and the method of manufacturing the casing device 20 having the above-described configurations, the first dividing member 37 and the second dividing member 38 are provided. , 38 satisfactorily guide the flow of the molten metal into the portion A, so that the portion A is filled with the molten metal prior to the air vent 39 located on the peripheral wall of the cavity 35.

Therefore, it is possible to prevent the air from being trapped in the cavity 35 and forming a void to cause molding failure.

Further, the flow dividing members 37 and 38 convert a part of the stream line vector of the molten metal, which is advancing by inertia force, into
Since the direction of the molten metal is changed so as to be directed to the portion A, the portion A
Can be shortened before filling with molten metal. That is, since the molten metal is filled in the portion A before the molten metal has not yet reached the air vent 39, molding failure can be prevented.

When the portion A is filled with the molten metal earlier than the air vent 39, the stream line vector is
Is smaller than the sum of the scalar of streamline vectors until the molten metal reaches the air vent 39. That is, the flow distance of the molten metal to the portion A is reduced by the flow dividing members 37 and 38.

The gap b between the projecting ends of the flow dividing members 37 and 38 and the inner wall surface of the second mold 32 with respect to the gap a of the cavity 35 is set to be about 25% or less.
Since the heights of the flow dividing members 37 and 38 are set,
When the molten metal is diverted in two directions, the molten metal can be uniformly distributed throughout the inside of the cavity 35.

Here, it has been confirmed by experiments that when the projecting heights of the flow dividing members 37 and 38 are set lower than this, the effect of the flow dividing is reduced.

Although the embodiment of the present invention has been described above, the present invention can be variously modified in addition to the above. This is described below.

In the above embodiment, the description has been given based on the projecting portion 36 formed in a substantially rectangular parallelepiped shape.
The shape is not limited to this, and there are various shapes. However, the present invention is applicable to projecting portions having other shapes. Hereinafter, representative examples will be described with reference to FIGS. 7 to 10.

FIG. 7 shows a protruding portion 5 formed in a columnar shape.
7A is a view showing the flow of the molten metal when the first flow dividing member 52 and the second flow dividing member 53 are not provided, and FIG. 7B is a view showing the first flow dividing member 52 and the second flow dividing. It is a figure showing the flow of the molten metal at the time of providing member 53.

In this case, similarly to the above case, the first branch member 52 and the second branch member 53 are arranged, and the stream line vector of the molten metal is guided to the part B shown in FIG. 7A (c). It has become so. Also in this case, similarly to the case where the protruding portion 36 is provided, the molten metal can be guided to the portion B in a short time, and thereby the cavity 3 can be formed.
5 can be prevented from being unfilled.

The positions where the first flow dividing member 52 and the second flow dividing member 53 are provided are the same as the positions of the first flow dividing member 37 and the second flow dividing member 38.

FIG. 8 shows a substantially rectangular parallelepiped projecting portion 61 having a longitudinal direction along the direction from the runner 34 to the air vent 39. FIG. 8A shows a first flow dividing member 62 and a second FIG. 8B is a view showing the flow of the molten metal when the flow dividing member 63 is not provided, and FIG.
It is a figure which shows the flow of the molten metal at the time of providing the 2nd flow distribution member 63.

Also in this case, since the molten metal introduced from the runner 34 collides with the protruding portion 61 and bypasses the protruding portion 61, the molten metal enters the portion C which is a shadow portion of the protruding portion 61 when viewed from the runner 34. Some parts are difficult to fill. For this reason, the first flow dividing member 62 and the second flow dividing member 63 are provided in the same arrangement as the case where the above-mentioned projecting portion 36 is provided, and guide the flow of the molten metal.

Further, in FIG.
FIG. 9A shows a configuration in which no projecting portion is formed inside, and FIG. 9A shows a flow of the molten metal when the first flow dividing member 72 and the second flow dividing member 73 are not provided.
FIG. 4 is a diagram showing a flow of molten metal when a first flow dividing member 72 and a second flow dividing member 73 are provided.

In this case, when the molten metal is introduced from the runner 34, an unfilled portion is likely to be formed on both side portions D near the exit of the runner 34. For this reason, while providing the 1st distribution member 71 which diverges a molten metal and advances a part of molten metal to the both sides B, the molten metal diverted by the 1st division member 71 is attached to the peripheral wall of cavity 35. The second flow dividing member 7 does not travel much along
2 is arranged on both sides B or on the near side of both sides B so as to be substantially parallel to the diagonal line of the cavity 35.

As a result, in the cavity 35, the molten metal proceeds in a plurality of directions, so that the entire cavity 35 is substantially uniformly filled with the molten metal.

Further, in FIG.
Projecting part 81 only at one end side near the runner 34
FIG. 10A shows a first flow dividing member 82, a second flow dividing member 83, and a third flow dividing member 8 shown in FIG.
FIG. 10B is a diagram showing the flow of the molten metal in a case where No. 4 is not provided.
FIG. 9 is a diagram showing a flow of molten metal when a first flow dividing member 82, a second flow dividing member 83, and a third flow dividing member 84 are provided.

In this configuration, the cavity 35
The molten metal attempts to advance diagonally downward in FIG. 10 circumventing the projecting portion 81 from the peripheral wall portion of the runner 34 and the substantially central portion of the runner 34, and the portion E of the substantially central portion of the cavity 35
Is difficult to fill with molten metal. Further, it is difficult for the molten metal to fill the part F on the other end side near the runner 34 where the protruding part 81 is not located.

In order to introduce the molten metal into the portions E and F, a first flow dividing member 82, a second flow dividing member 83 and a third flow dividing member 84 are provided. Here, the first flow dividing member 82 is arranged at a position adjacent to the projecting portion 81 in the direction in which the flow of the molten metal is blocked, and at the center of the flow of the molten metal in the runner 34. The first flow dividing member 82 is provided at an angle that blocks the flow of the molten metal (in FIG. 10, an angle substantially parallel to one of the diagonal lines of the cavity 35).

The flow is divided by the first flow dividing member 82,
Molten metal passing through a position between the projecting portion 81 and the first flow dividing member 82 is divided by the second flow dividing member 83. The second flow dividing member 83 is located at a position downstream (on the air vent 39 side) of the projecting portion 81 and is arranged substantially parallel to the projecting portion 81 or at an angle such that a gentle angle is formed from the parallel state. It is provided in.

The projecting portion 81 and the cavity 35
The portion between the peripheral walls of the air vent 3 and the direction parallel to the direction connecting the runner 34 to the air vent 39 is the air vent 3
Although the flow of the molten metal is generated toward 9, a third flow dividing member 84 is provided in order to direct the flow of the molten metal generated at this portion to the portion E. The third flow dividing member 84 is located on the downstream side (on the side of the air vent 39) of the projecting portion 81 and has an angle arrangement that is substantially parallel to the projecting portion 81 or an angle that makes a gentle angle from the parallel state. Is provided.

As a result, the first flow dividing member 37
Similarly to the case where the second flow dividing member 38 is provided, the inside of the cavity 35 is satisfactorily filled with the molten metal, and it is possible to prevent the occurrence of voids and the occurrence of molding defects.

The same effect can be obtained by providing the flow dividing member 84 in either the first mold 31 or the second mold 32. However, when a plurality of flow dividing members 84 are provided, only one of the molds 31, 31 is limited. Preferably, it is provided. Since a concave portion is formed by the flow dividing member 84 on the surface of the product on the side where the flow dividing member 84 is provided, the dies 31 and 3 in which the flow dividing member 84 is not provided.
2 makes it possible to use the surface formed as a design surface.

The modifications of the present invention have been described above with reference to FIGS. 7 to 10. However, the present invention can be modified in various ways.
In addition, the shape of the flow dividing member is not only a substantially linear shape, but also a curved shape.
Various things are possible.

Further, in the above embodiment, the case where the present invention is applied to the portable computer 10 has been described. However, other than this, the housing of various electric devices such as a portable telephone, a portable terminal information device, etc. Thus, the present invention can be applied.

When the present invention is applied to the housing device, defective portions due to unfilling are eliminated, so that a repairing step such as putty is not required, and the housing can be reduced in weight by the concave portion provided by the flow dividing means. Becomes In addition, since the punching process when forming the hole is eliminated, distortion due to the punching does not remain in the device, and thus a housing for an electric device such as a notebook personal computer or a mobile phone in which electric components are compactly arranged at a high density. It is suitable as a body.

[0071]

As described above, according to the present invention,
By providing the flow dividing means inside the cavity of the mold apparatus, the molten metal is divided in two directions. For this reason, even in a place where it is difficult to flow in the past, it is possible to satisfactorily guide and flow the flow by changing the arrangement of the flow dividing means in various ways.

For this reason, it is possible to prevent molding defects such as voids caused by incomplete flow of the molten metal.

Further, if the molten metal is filled by using the above-described mold apparatus, a good molding state can be obtained without causing molding failure even in the housing apparatus. The shape of the concave portion to be formed is not exposed in appearance, and can be maintained at the same shape as in the related art.

[Brief description of the drawings]

FIG. 1 is an exemplary perspective view showing the shape of a portable computer according to the embodiment;

FIG. 2 is a view showing a joint state of a lower housing and an upper housing according to the embodiment;

FIG. 3 is a diagram showing a state of a flow of a molten metal inside a cavity according to the embodiment of the present invention.

FIG. 4 is a diagram showing a configuration in the case where no equal flow member according to the embodiment is provided.

FIG. 5 is a side sectional view showing the configuration of the mold apparatus according to the embodiment.

FIG. 6 is a partially enlarged view showing a configuration of a mold apparatus according to the embodiment.

FIG. 7 is a view showing a state of a flow of a molten metal inside a cavity when a projecting portion according to a modification of the present invention is formed in a substantially columnar shape. In this case, column B shows the state of the flow of the molten metal when the flow dividing member is provided.

FIG. 8 is a view showing a state of a flow of molten metal inside a cavity when a projecting portion according to a modification of the present invention is provided with a substantially rectangular parallelepiped projecting portion having a longitudinal direction in a direction from a runner to an air vent. Row A shows the state of the flow of the molten metal when no flow dividing member is provided, and row B shows the state of the flow of the molten metal when the flow dividing member is provided.

FIG. 9 is a view showing the state of the flow of molten metal inside the cavity when no projecting portion is formed according to the modification of the present invention. The column shows the state of the flow of the molten metal when the flow dividing member is provided.

FIG. 10 is a view showing a state of a flow of a molten metal inside a cavity when a protruding portion is formed at one end near a runner according to a modification of the present invention. When there is no flow column, column B shows the state of the flow of the molten metal when the flow dividing member is provided.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Portable computer 20 ... Housing apparatus 21 ... Lower housing 22 ... Upper housing 30 ... Mold apparatus 31 ... 1st type | mold 32 ... 1st type | mold 35 ... Cavity 36, 51, 61, 71, 81 ... Projection Parts 37, 52, 62, 72, 82: first flow dividing member 38, 53, 63, 73, 83: second flow dividing member 84: third flow dividing member

Claims (9)

[Claims] 1. A mold apparatus in which a molten metal is introduced into a cavity formed by joining a first mold and a second mold, wherein the inside of the cavity has an inner wall surface of the first mold or a second mold. A mold apparatus, comprising: a flow dividing means projecting from a mold inner wall surface toward a second inner wall surface or a first inner wall surface with a predetermined gap. 2. A cavity into which a molten metal is introduced is formed in a joining surface of the first mold and the second mold, and a projection is provided in the cavity so that a thin metal part having a hole shape can be formed. In the mold device, the cavity protrudes from the inner wall surface of the first die or the inner wall surface of the second die toward the second inner wall surface or the first inner wall surface with a predetermined gap. A mold device comprising the formed flow dividing means. 3. The diverting means fills a part of a streamline vector of the molten metal flowing inside the cavity at a position inside the peripheral wall of the cavity and does not have the diverting means. 3. The mold apparatus according to claim 1, wherein the portion to be provided is provided so as to guide the cavity peripheral wall portion to flow before being filled with the molten metal. 4. A flow line vector of the molten metal flowing through the inside of the cavity in a portion where the molten metal is slowly filled when the flow dividing means is located at a position inside the peripheral wall of the cavity and there is no flow dividing means. The change of the stream line vector by the flow dividing means is provided in an arrangement where the scalar value of the flow along the stream line vector is shorter than at least a part of the cavity peripheral wall portion. 3. The method according to claim 1, wherein
The described mold apparatus. 5. The gap between the projecting end of the flow dividing means and the inner wall surface of the cavity is substantially equal to the gap of the cavity.
The mold apparatus according to any one of claims 1 to 4, wherein the mold apparatus is formed to 5% or less. 6. A molding method for a thin metal part, wherein a cavity is formed in a joining surface of the first mold and the second mold, and a molten metal is introduced into the cavity to form a thin metal part. Characterized in that it comprises a filling step of colliding a part of the molten metal introduced into the cavity with a flow dividing means protruding from the inner wall surface of the cavity to diverge at a predetermined angle to fill the molten metal inside the cavity. Metal parts molding method. 7. A thin metal part in which a cavity having a projecting portion is formed in a joining surface of the first mold and the second mold, and a molten metal is introduced into the cavity to form a thin metal part having a hole shape. In the molding method, the advancing direction of the molten metal introduced into the cavity and bypassing the protruding portion is caused to collide with a flow dividing means protruding from the inner wall surface of the cavity and diverted at a predetermined angle,
The molten metal is filled into the cavity by guiding such that one direction of the divided molten metal goes around at a position on the downstream side of the flow of the molten metal at the projecting portion before at least a part of the cavity peripheral wall portion. A method for forming a thin metal part, comprising a filling step. 8. A thin metal part in which a cavity having a projecting portion is formed in a joining surface between the first mold and the second mold, and a molten metal is introduced into the cavity to form a thin metal part having a hole shape. In the molding method, the traveling direction of the molten metal introduced into the cavity and bypassing the projecting portion is diverted into two directions at a predetermined angle by colliding with a flow dividing means protruding from the inner wall surface of the cavity, One direction of the divided molten metal is guided to a position on the downstream side of the flow of the molten metal at the projecting portion so that the traveling distance is shorter than at least a part of the cavity peripheral wall portion, and the molten metal is introduced into the cavity. A method for forming a thin metal part, comprising a filling step of filling. 9. A housing device formed by joining a first housing member and a second housing member formed by injection molding to a mold device having a flow dividing means inside a cavity, Alternatively, a hole shape is formed in the second housing member, and a concave shape is formed on the surface of the first or second housing member so as to surround the hole shape. Enclosure device.