JP2002011546A - Metallic mold set and method for producing casting and box parts - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a metallic mold set obtaining good yield of a product in an injection-forming of molten metal. SOLUTION: A second runner part C provided with a hollow part having sufficient depth to the height direction of a gate 21 having a gap of about 1 mm height and extended along the longitudinal direction of a cavity D together with the gate 21, plays a part, in which the molten metal made to flow in from a first runner part B is temporarily stored. By this constitution, the flow-front of the molten metal in the cavity D is stabilized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technology for forming a housing part of an electric product such as a portable terminal device by injecting a molten metal and cooling and solidifying it.

[0002]

2. Description of the Related Art In recent years, portable information terminals such as personal computers and mobile radios have become widespread. In order to mount a large number of components in a limited capacity, high-density mounting is required. I have. For this reason, it is necessary to reduce the size of passive chip components such as resistors / capacitors / coils and semiconductor elements on which integrated circuits are provided, to reduce the spacing between components,
Measures such as making the electrode pitch fine have been taken. In addition, the housing for holding these high-density mounted components integrally has been made thinner and lighter. Considering the advantages of recyclability and strength, consideration is given to using metals such as magnesium for the material. Have been. Since the metal is cooled by contact with the mold surface and easily solidifies rapidly, it is necessary to fill the voids quickly (for example, in about 20 milliseconds) at an extremely high injection speed as compared with injection molding using a resin. There are a hot chamber method, a cold chamber method, a thixomold method, and the like as a method of injecting and molding a molten metal into a mold.

FIG. 6 is a schematic view showing the shape of a cavity of a mold as viewed from the longitudinal direction of the gate A. The flow of the molten metal injected from the gate part XA is converged in the runner part XB,
The flow rate increases sharply. This flow is branched in the width direction according to the product shape, and the Australian Gate XC
At the cavity portion XD. Runner part XB
The flow of the molten metal is controlled by the setting of the length of the Australian gate XC from an arbitrary position of the runner part XB to the cavity part XD so that the timing and the flow velocity etc. flowing into the cavity part XD are controlled. Designed.

[0004]

However, when the conventional mold structure as shown in FIG. 6 is used, when the injection speed is high and the casting pressure is high, the gate length (gate length) of the Australian gate XC is high. It is difficult to control the timing of entering the molten metal into the cavity XD only by setting the shape), and as a result, the flow velocity of the molten metal on the extension of the first runner portion XB in the cavity XD becomes too large. Then, the collision with the end of the cavity portion XD caused a large amount of backflow as shown by a dotted line portion 101, which disturbed the flow of the molten metal in the cavity portion XD.

[0005] Further, as shown by a dotted line portion 102, the metal that collides with the side wall constituting the cavity portion XD is rebounded, so that the flow velocity near the side wall portion also increases, and the flow of the molten metal in the cavity portion XD is disturbed. I was Further, as described above, although the flow velocity was high near the center and the side wall of the cavity part XD, the flow velocity was low in the other parts, and the flow front 103 of the molten metal was a curved curve. .

As described above, when the conventional casting technique is used, large and thick structural parts such as an engine block can be formed stably. It is relatively small, and is itself exposed as a design surface and greatly contributes to aesthetic appearance.
With respect to a thin-walled structure having a simple box shape except for a part such as No. 4, defects such as nests, hot water lines, cracks, sink marks, etc. were generated, and it was difficult to manufacture with a high yield. Further, although it can be manufactured, it often repairs defects to finish its appearance, and in order to use it as a part, many man-hours for repair are required. Therefore, an object of the present invention is to provide a manufacturing method and a manufacturing apparatus capable of manufacturing a thin-walled cast such as a casing used for an electric product with a high yield.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a gate, a first flow path for converging the flow of molten metal injected from the gate, and an inflow from the first flow path. A second flow path for temporarily storing the decelerated molten metal having an inhibitory surface that substantially inhibits the flow of the molten metal into the cavity of the flow front, and a longitudinal length of the second flow path A gate provided along a direction, through which the molten metal stored in the second flow path passes when pressure is applied, to provide a mold apparatus for molten metal. The present invention also provides a runner having a blocking surface for receiving a flow front of a molten metal injected from a gate, mainly with a flat surface or a concave surface on a cavity side, and having a branch portion for dividing the molten metal by the blocking surface. A mold device for molten metal, comprising:
The present invention also includes at least a gate, a runner, a gate, and a cavity, wherein the runner has an inhibition surface having an action of at least temporarily inhibiting progress of a flow front of the molten metal injected from the gate, and A mold apparatus for molten metal is provided, wherein the obstructing surface is configured to extend along a width direction of the cavity.

Further, the present invention provides a first flow path connected to the sleeve, a second flow path for converging the flow of the molten metal from the first flow path, and a converging by the second flow path. A third flow path for diffusing the flow of the melt, a gate provided along the third flow path, and a fourth flow path having an inverted shape of a structure for flowing the flow from the gate. A gas vent disposed around the fourth flow path, and a chill vent connected to at least a part of the gas vent, wherein the gas vent connected to the chill vent is a portion into which the molten metal flows. And a flow path formed to be wider than these flow paths is provided between the flow path and the portion from which the molten metal flows out. At this time, the members constituting the cavities of these mold devices consist of a base metal of hot die steel, an intermediate layer of stainless steel sprayed on the surface of the base metal, and a cobalt alloy sprayed on the surface of the intermediate layer. It preferably comprises a cobalt alloy layer. In addition, the present invention also provides at least temporarily hindering the progress of the molten metal injected from the gate to the flow front gate to decelerate the molten metal, and mainly fills the inside of the runner with the molten metal and then cavities the molten metal through the gate. The present invention provides a method for producing a casting, comprising a step of injecting into a casting.

Further, the present invention provides at least a temporary blockage of the flow of the molten metal injected from the sprue to the flow front gate, thereby decelerating the molten metal. A step of filling the molten metal into a cavity having an inverted shape of a body part to obtain a structure; and, of the structure, a portion solidified in the cavity and a portion solidified in a portion other than the cavity. And a separating method.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION A cold chamber method is employed for die casting in an embodiment of the present invention.
Die casting is a method of sequentially supplying a molten metal (hereinafter, a molten metal) from the outside.
A system capable of high-speed injection with a relatively high casting pressure of about 0 kg / cm ³ can be constructed. In this regard, it is a preferable method for molding a structure in which a thin portion occupies a high proportion of the entire structure such as a box. is there. In addition, the thin wall means a thickness of 2 mm or less, and the thin wall means a structure formed thin at a portion constituting most of the design surface. Hereinafter, the method for casting a structure of the present invention will be described in detail with reference to the drawings.

<Casting System> FIG. 1A is a schematic view of a casting system of a cold chamber type according to an embodiment of the present invention. The mold apparatus 10 includes a movable mold 11 that can reciprocate freely,
The movable mold 11 can be moved toward and away from the fixed mold 12. When the fixed mold 12 and the movable mold 11 are in close contact with each other, a cavity D, which is a hollow part having an inverted shape of the product, is formed. Fixed type 12
On the side, a gate A for introducing molten metal into the cavity D
Is provided. A sleeve 13, which is a cylindrical body having a cavity through which the molten metal can flow, is horizontally connected to the direction of gravity to the gate A, and a plunger 14 connected to an injection machine (not shown) is provided in the sleeve 13. It is fitted so that it can move forward and backward. The sleeve 13 is provided with a pouring opening 15 which is an opening for injecting the molten metal into the inside. In some cases, a burner or the like is provided below the sleeve 13 as a heating device for making it difficult to cool the molten metal.
It is preferable that the sleeve 13 be heated to maintain the temperature of the molten metal, since the fluidity of the molten metal in the mold apparatus 10 can be further increased.

Next, the operation of the casting system will be described with reference to FIGS. 1 (a) and 1 (b). After applying a release agent to the concave portions forming the cavities of the movable mold 11 and the fixed mold 12, the movable mold 11 is driven to move the movable mold 11 and the fixed mold 1.
2 and a cavity D communicating with the gate A is formed (ST1). Next, a magnesium alloy (molten metal 17) in a molten state is pumped out of the heating furnace by the supply device 16, and the molten metal 1
7 is supplied into the sleeve 13 (ST2). Next, the plunger 14 is quickly slid toward the fixed mold 12 by an injection machine (not shown), so that the molten metal injected into the sleeve 13 is moved from the gate A provided in the mold apparatus 10 into the mold apparatus 10. (ST3). Next, the mold apparatus 10
After the molten metal press-fitted into the mold radiates heat to the mold device 10 and solidifies by cooling, as shown in FIG.
Is returned to the original position (ST4). Next, the movable mold 1
1 is pulled back and separated from the fixed mold 12 (ST5). At this time, the structure of the magnesium alloy cooled and solidified is attached to the movable mold 11 side. The structure of the magnesium alloy is extruded by an eject pin (not shown) provided in the movable mold 11 and is released from the movable mold 11. This completes one cycle of casting.

Unnecessary portions of the casting thus obtained are cut off by a punch press.
As shown in (a), only the portion corresponding to the cavity D is taken out as the product X, and the remaining portion is collected for recycling. The product X is subjected to a deburring and painting process as necessary, and then used as a part of a housing of a notebook personal computer Y as an electric product as shown in FIG. 2B, for example. When used for portable electric products such as notebook computers and mobile phones, the portability of these electric products can be improved.

<Structure of Flow Path> The behavior of the molten metal in the mold apparatus 10 will be described below in detail with reference to the drawings. Fig. 3 (a)
FIG. 3 is a schematic view showing a flow path of a molten metal formed in the mold apparatus 10 when the movable mold 11 and the fixed mold 12 are in close contact with each other.
FIG. 3B is a schematic diagram of a cross section taken along line MM ′ in FIG. First, the molten metal charged into the sleeve 13 is sent out by the plunger 14 to a sprue A, which is an opening for pouring the molten metal into the mold, which is a connection between the sleeve 13 and the mold apparatus. The molten metal pressed into the sprue A by the plunger 14 flows into the first runner portion B communicating with the sprue A. When viewed from the flow direction of the molten metal, the first runner portion B is formed to be thinner than the cross-sectional area of the gate A, and the cross-sectional area ratio is set to about 0.1. First
The molten metal whose flow velocity has been increased in the runner section B flows into the second runner section C. The second runner section C extends in a direction orthogonal to the main flow direction of the molten metal flowing in the first runner section B. The molten metal is divided at the second runner portion C in the width direction of the product shape. The second runner section C and the cavity section D are connected to each other via a throttle-like gap (gate 21) having a height of about 1 mm and extending in the longitudinal direction of the second runner section C. The molten metal flows into the cavity D through the gate 21. The cavity D is a cavity having an inverted shape of a box formed between a concave portion on the surface of the movable mold and a convex portion on the fixed mold. The molten metal that advances while filling the cavity D advances while causing the molten metal containing air bubbles to enter the gas vent E provided on the outer periphery of the cavity D. A gas vent E is also provided at the end of the cavity D, and the gas filling the cavity proceeds while exhausting the gas from the gas vent E.

When the flow front reaches the end of the cavity D, the molten metal enters the gas vent E and proceeds further. The gas vent E provided at the end of the cavity D has a molten metal pool portion 22 formed in the gas vent E in a flow path wider than other portions, and damping of the momentum due to the molten metal pool portion 22. It enters the chill vent F under the action. The chill vent F is formed so that the cross-sectional shape cut along the traveling direction of the flow front becomes a zigzag shape in order to form a longer flow path. By solidifying the flow front of the molten metal in the chill vent F, the solidified material functions as a plug, and the molten metal does not flow out of the mold. Although a predetermined casting pressure is applied to the molten metal, the mechanical reaction caused by the solidified body in the chill vent F is minimized by the action of the molten metal pool 22 of the gas vent E in front of the chill vent F. Therefore, particularly in the molding of a thin wall, the molten metal pool 22 in the gas vent E facilitates the stabilization of the molding in the cavity D. The time required for the molten metal to flow from the gate A and solidify in the chill vent F is about 2 milliseconds. During this time, the heat of the molten metal naturally radiates to the mold device and is cooled. The molten metal in the other parts solidifies as well.

In particular, in the injection molding of the cold chamber system, since air is entrapped in the sleeve 13 by the pushing by the plunger 14, when bubbles are mixed in the molten metal at the time before the injection into the cavity D, There are many things. Since such bubbles are particularly large in the portion near the flow front of the molten metal,
By providing the gas vent, such bubbles can be eliminated from the design surface. Also, in the gas vent connected to the chill vent, a pool of the molten metal is formed in the gas vent by expanding the halfway flow path, and the transmission of the pressure of the molten metal colliding at a high speed is slowed down. The effect of the reaction on the design surface is reduced.

<Details of the sprue and the runner part> The sprue is a connecting part for connecting and connecting the sleeve. The runner is used to supply the molten metal injected from the sprue to the cavity. It is a distribution channel for distributing and sending the molten metal so that it is filled all over the inside. The structure of the distribution channel is determined according to the shape of the cavity. Further, the distribution channel is not limited to one channel having to be distributed to a plurality of gates, and may be configured to be connected to a single gate as described below. Absent.

Referring now to the drawings, the gate A, the first runner section B, and the second runner section C in the above-mentioned flow channel structure will be described in detail. FIG. 4 is a schematic diagram particularly showing the first runner portion B and the second runner portion C, and FIG.
(a-1) is a case cut out from FIG. 3 (a), and FIG. 4 (a-2) is a second runner portion C when FIG. 4 (a-1) is viewed from the right side of the drawing.
Are respectively shown. The hatched portion indicates the portion occupied by the mold material. Assuming that the area of the cross section at the dotted line O of the gate A shown in FIG. 3B is L, and the area of the cross section at the dotted line P of the first runner portion B of the flow path shown in FIG. ,
In the above embodiment, M / L = 0.1 is set. Further, when the area of the cross section along the dotted line Q of the second runner portion C shown in FIG. 4A is N, M is set to be 2N. Dotted lines O, P, and Q each indicate a cross section perpendicular to the main traveling direction of the molten metal flowing into each hollow channel. An attempt was made to connect the flow path of the above design to the longitudinal direction of the cavity D having an inverted shape of a casing part of approximately A4 size (296 mm x 210 mm) and molding was performed. Was completed. Regarding the relationship between the cross-sectional areas M and N, by setting the cross-sectional area of the rear part not to be larger than the cross-sectional area of the front part, injection with a small pressure loss is enabled. Also, the flow rate is set to be as close as possible to M = 2N so that the cross-sectional area of the rear part does not become too small, thereby avoiding an abrupt increase in flow velocity. This stabilizes the flow front and enables high-speed filling within a controllable range. The relationship between the cross-sectional area L and the cross-sectional area M is
From the viewpoint of preventing a decrease in flow velocity due to pressure loss, it was confirmed that the difference is preferably as small as possible, and it is preferable to set at least the value of M / L to be 0.05 or more.
It was also confirmed that it is similarly preferable to set the value of 2N / L to be 0.05 or more.

That is, in the case of manufacturing a housing of a general electric product having a size smaller than that used at home, the cross-sectional area 2N of the second runner portion C and the cross-sectional area L
It is desired to design such that 2N / L approaches 1 as much as possible. In addition, the M / L of the cross-sectional area of the conventional runner portion is about 0.02 to 0.03,
It also did not have a second runner part having a storage function as described later.

<Details of Second Runner Portion> The second runner portion C is provided with a cavity having a maximum depth of 20 mm sufficient in the height direction for a gate 21 having a gap of about 1 mm in height. Have. In other words, it is a flow path having a structure in which an aperture-like gate 21 is disposed at one end in the depth direction of the cavity. Of the wall surfaces constituting the second runner portion C, the wall portion W on the side where the gate 21 extending along the long side direction of the cavity D is continuously provided is in the traveling direction of the flow front, ie, in the first direction. Of the molten metal that has flowed from the first runner portion B, and the flow into the cavity D is temporarily stopped for most of the flow front of the molten metal flowing from the first runner portion B. It plays a role of inhibiting. Due to this inhibiting action, the timing of the flow front flowing into the cavity D from the first runner portion B can be delayed. That is, instead of a runner structure having a branch portion that is sharply convex toward the gate side as in the related art, the wall surface of the branch portion is formed in a direction perpendicular to the traveling direction of the flow front or a concave portion on the cavity D side. By having such a branching part, it is possible to cause a delay in the advance of the entering flow front to the cavity D side.

Further, the second runner section C has a space in which the molten metal can be temporarily stored, so that it is easy to control the flow front of the molten metal flowing into the cavity D. In the conventional structure, the flow front of the flow front is directed to the gate so as not to attenuate as much as possible, and it is designed to control the outflow to the cavity by the length of the gate. In addition, no extra space is provided except for a flow path sufficient for advancing the molten metal, and there is no inhibitory action or storage action. Therefore, in the conventional structure, the first
The molten metal intrudes into the cavity D in an uncontrollable state in accordance with the inflow pressure and the inflow velocity at the runner part, and a large amount of molten metal is supplied near the extension of the runner part in the extending direction, and to the other peripheral parts. Caused a situation in which almost no molten metal was supplied.

According to the configuration of the distribution channel of the present invention, the gate A
The molten metal flowing from the cavity D is temporarily inhibited from flowing into the cavity D by the collision with the obstruction action surface W, and is temporarily stored in the cavity of the second runner portion C. It acts to make the inflow timing in the width direction uniform. When the inside of the second runner section C is filled with the molten metal, injection is performed again from the second runner section C into the cavity D by pressure transmission based on the Pascal's principle. It is configured so that it can be fed at the casting pressure of the injection machine without relying on the inertial force due to the moving speed of the plunger. It was something.

Further, in the flow channel structure of the present invention shown in FIG.
When the cross section cut in the long side direction (width direction) is viewed, the long side is communicated with the long side of the cavity D via the gate and is parallel to the long side of the cavity D. It has been extended. That is, the gate extends in the longitudinal direction of the cavity. As a result, it is possible to shorten the time for flowing through the cavity D, so that the molten metal is hardly cooled and solidified, and it is possible to suppress the loss of the fluidity of the molten metal.

The ejector pins 3 are provided on the surface (the bottom surface of the second runner portion C) opposite to the gate 21 with respect to the main flow direction of the molten metal in the second runner portion C.
1 are arranged so as to be line-symmetric with respect to the long side direction (width direction) of the cavity D. Note that the surface shape of the bottom surface is a plane. Since a wall portion (including the inhibition surface W) formed continuously with the gate 21 is tapered, the cross section of the second runner portion C has a substantially trapezoidal shape.
It is preferable that the ejector pins 31 be disposed in the second runner portion C rather than in the cavity D, because they have less influence on the product shape. In the flow channel structure of the present invention shown in FIG. 3, since the rigidity of the solidified body solidified in the runner is high, the molded product can be easily taken out.
Various modifications are possible for the shape of the bottom surface and cross section of the second runner portion. The cross section may be a discontinuous shape such as a polygonal shape, but is preferably formed in a circle, a semicircle, a free curved shape or the like from the viewpoint of easy flow of the molten metal.

The second runner portion C shown in FIG. 4B has a step 32 on the bottom surface in the width direction of the cavity D. The molten metal that has collided with the step 32 has a gate 21.
A flow vector toward. Therefore, by adjusting the location, shape, height, number, and the like of the step 21, the amount of molten metal flowing into the cavity can be controlled in the width direction.

The runner shown in FIG. 4 (c) has a bottom portion which is inclined so as to be gradually shallower in the width direction. Since the flow rate of the molten metal is very high, the tendency of the flow may be controllable even if no clear step is formed. In some cases, the flow rate of the molten metal in the width direction of the cavity D can be adjusted by using a bottom surface having a free-curve shape. Can be generated.

As for the gate length of the gate 21, the length from the cavity D is conventionally 1.0 mm (runner terminal end) and 3
Although it was set to be as wide as 0 mm (runner branch point), it was confirmed that a maximum distance of 10 mm or less is preferable as a distance through which the molten metal passes through the gate. Since the molten metal is cooled when passing through the gate and the fluidity is deteriorated, it is considered that the molded product is defective. In addition, since the part solidified in the cavity D and the part solidified in the second runner part C are finally separated by pressing, the gate length may be 1.0 mm or more in order to leave a margin for cutting. preferable. The number of openings of the gate 21 is not limited to one as shown in FIG. 3, but is divided into a plurality of parts through a partition like a gas vent E connected to the chill vent F. Is also good. Further, the length of the second runner portion C in the width direction of the cavity D is set to 0.8 times the width of the cavity D in the above embodiment, but is not limited to this and can be set as appropriate.

In the above embodiment, the case where the magnesium alloy is used for the molten metal has been described. However, the present invention is not limited to this.
For example, the present invention can be applied to aluminum, zinc, copper, and alloys thereof. In the above embodiment, the injection system of the cold chamber type has been described. However, the present invention is not limited to this, and the present invention is also applicable to a mold apparatus of a hot chamber type or a thixomold type. Further, in the above-described embodiment, the description has been made using the method of manufacturing the housing parts of the notebook personal computer. However, the outer housing itself used for a portable audio device, a portable telephone device, a bag, or the like has a design shape itself. However, the present invention has a special effect on the case parts constituting the above, but is not limited to the application and can be applied as needed.

<Configuration of Mold Surface Constituting Cavity>
In the above-described embodiment, a nitrided cemented carbide is used for the surface of the mold constituting the cavity D. However, it is preferable to apply various coatings in consideration of the durability of the mold. In the following, embodiments of a particularly effective coating will be described with reference to the drawings.

In order to obtain a thin cast product, it is necessary to quickly fill the cavity with the molten metal so that the fluidity does not deteriorate due to a decrease in the temperature of the molten metal. Therefore, the time required for injecting the molten metal is about 2 milliseconds when the cold chamber method is used. Considering other casting methods such as the hot chamber method and the thixomold method, the inflow velocity of the molten metal at the gate is estimated to be in the range of about 50 m / s to 200 m / s. However, if a high-temperature fluid collides with the object surface at high speed, the frequency of occurrence of erosion and microcracks on the object surface also becomes significant. When a defect occurs on the mold surface, the fluidity deteriorates, or the shape of the defect is transferred to the surface of the molded product, which causes molding failure. In addition, stress due to impact or thermal history may concentrate on the defective portion, causing cracks in the mold. Therefore, it is preferable to provide a structure in which such cavitation erosion hardly occurs when considering the quality of the molded product and the life of the mold.

FIG. 5 is a schematic diagram showing the surface of the nest forming the cavity D of the mold apparatus according to the embodiment of the present invention. The nest 40 is made of hot die steel (SK) as in the prior art.
D61), and the metal part 41
An intermediate layer 42 made of stainless steel (SUS304) and having a thickness of about 2 mm formed on the surface, and a 2 m surface formed on the surface of the intermediate layer 42 and serving as a mold surface constituting the cavity D.
and a cobalt alloy layer 43 having a thickness of about m. The surface of the cobalt alloy layer 43 is subjected to finish processing to improve roughness. The intermediate layer 42 is provided in order to prevent the cobalt alloy layer 43 from being separated from the insert 40. The cobalt alloy layer 43 is formed by spraying or welding the cobalt alloy. At this time, thermal stress is generated between the hot die steel and the cobalt alloy, and there is a problem that the joint cannot be performed well. Even if joining can be performed, peeling may proceed due to residual stress or heat history given in casting. Therefore, by forming the intermediate layer 42 with a member that relieves thermal stress, it is possible to prevent the cobalt alloy layer 43 from being peeled and broken.

The cobalt alloy constituting the cobalt alloy layer 43 includes Co: 64%, Cr: 28%, W: 4%, Fe: 3%, C: 1% by weight.
An alloy having the following composition ratio was used. In the mold using this cobalt alloy, the durability performance was eight times and four times that of the hot die steel and the nitrided hot die steel, respectively. Moreover, the nitriding layer formed on the surface of the hot die steel is about 0.1 mm, but by forming a layer of the cobalt alloy by welding or thermal spraying, a thickness of 2 mm was realized. Practically, a longer life can be expected. When the coating with the cobalt alloy is applied to the mold, it is sufficient that the coating is performed only on the surface constituting the gate portion and the cavity in the case of a normal mold. In the case of having an inhibitory surface having an action of decelerating the flow front of the molten metal, it is preferable that the inhibitory surface is also coated.

[0033]

As described in detail above, the method for manufacturing a mold apparatus and a structure according to the present invention enables a cast such as a thin-walled housing to be manufactured with high yield.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a cold chamber type casting system and an operation thereof according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a part used as a product from the structure of the present invention and a housing device using this part.

FIG. 3 is a schematic view showing a shape of a cavity of the mold device of the present invention.

FIG. 4 is a schematic view showing details of a runner section of the present invention.

FIG. 5 is a schematic view showing a structure in the vicinity of a cavity of the mold device of the present invention.

FIG. 6 is a schematic diagram showing a shape of a cavity of a conventional mold device.

[Explanation of symbols]

A, XA: gate, B: first runner, C: second runner, D, XD: cavity, E: gas vent, F: chill vent, Y: personal computer, 10: mold apparatus, 11: movable mold , 12 ... fixed type, 13 ... sleeve, 14 ... plunger, 15 ... pouring port, 16 ... feeder, 17 ... molten metal, 21 ...
Gate, 22: molten metal pool, 31: ejector pin, 3
2 Step, 40 nesting, 41 Metal part, 42 Intermediate layer, 43 Cobalt alloy layer, 103 Flow front,
104: boss, W: inhibition surface, XB: runner part, XC
… Australian Gate

Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat II (reference) B22D 17/22 B22D 17/22 G Q B29C 45/26 B29C 45/26 45/34 45/34

Claims (7)

[Claims] 1. A gate, a first flow path for converging a flow of the molten metal injected from the gate, and a flow of the molten metal flowing from the first flow path into the cavity of the flow front. A second flow path having an inhibiting action surface for temporarily storing the decelerated molten metal, and provided along the longitudinal direction of the second flow path and stored in the second flow path. And a gate through which the molten metal is passed by being pressurized. 2. A runner having an obstructing surface for receiving a flow front of molten metal injected from a gate, mainly as a flat surface or a concave surface on a cavity side, and having a branch portion for diverting the molten metal by the obstructing surface. A mold apparatus for molten metal, comprising: 3. A runner having at least a sprue, a runner, a gate, and a cavity, wherein the runner has an obstructing surface having an action of at least temporarily obstructing the flow front of the molten metal injected from the sprue, and A mold apparatus for molten metal, characterized in that the obstruction surface is configured to extend along a width direction of the cavity. 4. A first flow path communicating with the sleeve,
A second flow path for converging the flow of the molten metal from the first flow path, a third flow path for diffusing the flow of the molten metal converged by the second flow path, and the third flow path A fourth flow path having an inverted shape of a structure for flowing the flow from the gate, a gas vent disposed around the fourth flow path, and at least one of the gas vents. A chill vent communicating with the portion, and at least the gas vent to which the chill vent is communicatively connected is a halfway portion between a portion into which the molten metal flows and a portion from which the molten metal flows out. A mold apparatus for molten metal, characterized in that it is formed wider than other parts. 5. A member constituting the cavity is a base metal made of hot die steel, an intermediate layer made of stainless steel sprayed on the surface of the base metal, and a cobalt alloy layer made of a cobalt alloy sprayed on the surface of the intermediate layer. The mold apparatus for molten metal according to any one of claims 1 to 4, wherein the mold apparatus comprises: 6. The progress of the molten metal injected from the gate to the flow front gate is decelerated at least temporarily by a wall surface of a runner provided along the gate, and the molten metal is mainly filled in the runner. And filling the molten metal into the cavity through the gate after the filling. 7. The flow of the molten metal injected from the gate is decelerated by at least temporarily obstructing the progress of the molten metal to the flow front gate, and after the inside of the runner is filled with the molten metal, the housing component is mainly moved through the gate. A step of obtaining a structure by filling the molten metal into a cavity having an inverted shape; and a step of separating a portion of the structure solidified in the cavity from a portion solidified in a portion other than the cavity. And a method for manufacturing a housing component.