CN101518817A - Die for die casting and method of manufacturing cast product - Google Patents

Abstract

A mold (1), comprising: a fixed mold (31) and a movable mold (32). Between the movable mold (32) and the fixed mold (31), there is formed: a main product part (66) and a protruding part (67a, 67b) protruding from the main product part (66) toward the blank part (42). The product section (43), configured to guide a first flow channel (53) of molten metal towards the main product section (66), and configured to guide a second flow channel (55) of molten metal towards the protrusions (67a, 67b). The second flow channel (55) is arranged at a position three-dimensionally deviated from the first flow channel (53) and straddles the first flow channel (53).

Description

Mold for die casting and method of manufacturing cast product

technical field

One embodiment of the present invention relates to a technique associated with die casting.

Background technique

A die-casting mold for a cold-chamber die casting system includes a biscuit section for receiving molten metal from an injection device of a casting machine, a product section in which a product is cast, for A main runner that guides the molten metal from the billet part toward the product part, and a main gate (main gate) provided between the main runner and the product part for making the molten metal flow by reducing the thickness sharply Speed up.

Here, the solidification time of molten metal such as magnesium alloy or the like is very short, and therefore, in a die-casting mold having a small flow cross-sectional area (that is, the cross-sectional area of the space through which the molten metal flows), the molten metal Does not fill every corner of the product section, and in some cases insufficient filling occurs. For this reason, some die-casting molds, which are prone to insufficient filling, are provided with sub-runners and sub-gates for performing flow support from the side of the product part in addition to the sprue and main gate.

In Japanese Patent Application Laid-Open Publication No. 2002-45956, there is disclosed a mold structure provided with sub-runners branched from main runners. The secondary flow channel extends to the side of the product part and communicates with the side edge of the product part.

In Japanese Patent Application Laid-Open Publication No. 2002-263820, a mold for casting a display housing is disclosed. The display housing has support walls formed by injecting a magnesium alloy into a mold space. The support wall includes a lower edge portion and an upper edge portion on an opposite side of the lower edge portion. In the central portion of the lower edge portion, there is provided a cutout portion cut out to face the upper edge portion. The gate of the mold is connected to this cutout.

Incidentally, for example, in a cast product of a display case as described in Japanese Patent Application Laid-Open Publication No. 2002-263820, there may be a protruding portion at an edge portion thereof. A product part for casting such a cast product includes a main product part in which a body part of the cast product located outside the protruding part is cast, and a protruding part protruding from the product part, and a protruding part in which the protruding part is cast. Further, in some cases, the protruding portion is arranged on the blank portion side of the main product portion.

In such a mold, when the main gate is connected to the main product part, the protrusion is positioned on the upstream side of the molten metal filling port of the main gate with respect to the molten metal flow. Magnesium alloy or similar molten metal becomes a highly directional flow due to gravity, and thus it is difficult to fill the protrusion with molten metal. For this reason, it is likely to result in defective casting such as lack of strength at the protruding portion or the like.

Contents of the invention

It is an object of the present invention to provide a mold capable of reducing defective casting.

Another object of the present invention is to provide a method of manufacturing a cast product by which defective casting can be reduced.

In order to achieve the above object, a mold for die casting according to the present invention includes: a fixed mold and a movable mold to be combined with the fixed mold. When the movable mold is combined with the fixed mold, the blank part, the product part, the first runner, the first gate, the second runner and the second gate are formed between the movable mold and the fixed mold. The billet portion is a portion into which molten metal is to be poured. The product section includes a main product section and a protruding section protruding from the main product section toward the billet section. The first runner is configured to guide molten metal injected into the billet portion toward the main product portion. The first gate is provided between the first runner and the main product part, at a position downstream of the protruding part in the flow direction of the molten metal. The second runner is configured to guide molten metal injected into the billet portion toward the protruding portion. The second gate is provided between the second runner and the protrusion. The second flow channel is arranged at a position three-dimensionally deviated from the first flow channel, and straddles the first flow channel.

In order to achieve the above-mentioned another object, the method of manufacturing a cast product according to the present invention comprises: preparing a mold including a fixed mold and a movable mold to be combined with the fixed mold, and in the mold, when the movable mold is combined with the fixed mold, When the fixed mold is combined, the blank part, the product part, the first runner, the first gate, the second runner and the second gate are formed between the movable mold and the fixed mold, (i) the blank part is molten metal The part to be injected, (ii) the product part includes a main product part and a protruding part protruding from the main product part toward the billet part side, (iii) the first runner is configured to guide the molten metal injected into the billet part toward the main product part , (iv) the first gate is provided between the first runner and the main product part at a position on the downstream side of the protruding part in the flow direction of the molten metal, (v) the second runner is configured to guide the injection toward the protruding part The molten metal of the billet part, (vi) the second gate is provided between the second runner and the protruding part, and (vii) the second runner is provided at a position three-dimensionally deviated from the first runner, and straddles the first runner channel; combine movable and stationary dies; and inject molten metal into the billet section.

According to the present invention, defective casting can be reduced.

Other objectives and advantages of the present invention will be clarified in the following description, some of which are obvious from the written description, or can be understood through the practice of the present invention. The purposes and advantages of the present invention will be realized through various means and combinations thereof particularly pointed out in the following text.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate various embodiments of the invention and, together with the general description given above and the detailed description of various embodiments given below, serve to explain the principles of the invention. .

Figure 1 is an exemplary exploded perspective view of a mold according to one embodiment of the present invention;

Figure 2 is an exemplary exploded perspective view of a cast product according to one embodiment of the present invention;

Fig. 3 is an exemplary view schematically showing the internal space structure of the mold shown in Fig. 1;

Fig. 4 shows in an enlarged manner the exemplary perspective view of the internal space structure of the mold shown in Fig. 3 in the area surrounded by the line F4;

5 is an exemplary view showing an example of the internal space structure of the mold;

Fig. 6 is an exemplary view showing another example of the internal space structure of the mold;

Fig. 7 is an explanatory view showing still another example of the inner space structure of the mold.

Detailed ways

A mold 1 according to an embodiment of the present invention, and a method of producing a cast product 2 will be described below with reference to FIGS. 1 to 4 . Figure 1 shows a mold 1 according to this embodiment.

The mold 1 is used for die casting in a cold-chamber die casting system, for example. For example, magnesium alloy, aluminum alloy or zinc alloy is injected into this mold 1 by pressure as a molten metal. Incidentally, the die according to the present invention is not limited to the above-mentioned materials, and can be widely used for die-casting various materials used as molten metal.

FIG. 2 shows an example of a cast product 2 of a product cast by using the mold 1 . This cast product 2 is, for example, a component constituting a part of a main body casing of an electronic device such as a laptop computer, or a part of a casing of a display unit of an electronic device. A case constituting the bottom of the device main body, a display cover for protecting the rear surface of the display device, and the like correspond to more specific specific examples. Incidentally, cast products to which the present invention can be applied are not limited to the above examples, and various other products can be manufactured.

As shown in FIG. 2 , the cast product 2 includes, for example, a rectangular bottom wall 11 and a vertical wall 12 standing up from the outer peripheral portion of the bottom wall 11 so as to have a box-like shape open at one side thereof. The cast product 2 further comprises a first end portion 13, a second end portion 14 positioned on the opposite side of the first end portion 13 in the cast product 2, and side edge portions 15 and 16, each of which One extends between the first and second end portions 13 and 14 . The first and second end portions 13 and 14 extend, for example, along the length direction of the cast product 2 . A cutout portion 17 cut off toward the second end portion 14 is provided at a central portion of the first end portion 13 .

This cut-out portion 17 is provided, for example, to form a power supply unit insertion portion, or a hinge-attached display unit footsection, to which, for example, a battery is detachably attached. Incidentally, the purpose of providing the cutout is not limited to the above example, and cutouts provided for various purposes correspond to the cutouts mentioned in the present invention.

As shown in FIG. 2 , the mint product 2 includes a cutout 17 and thus includes a pair of protruding portions 22 a and 22 b extending from the first end 13 and toward the opposite side of the second end 14 . The corners defined by the side edge portions 15 and 16 protrude. That is, the cast product 2 includes a main body portion 21, and protruding portions 22a and 22b. This main body portion 21 is a remaining portion of the cast product 2 except for the protruding portions 22a and 22b.

The protruding portions 22 a and 22 b are provided at, for example, both end portions of the first end portion 13 , separated from each other in the lengthwise direction. The cutout portion 17 is set relatively large to occupy, for example, most of the first end portion 13, and is formed larger than the sum of the protruding portions 22a and 22b, for example. An example of a cast product 2 is a thin-walled product, and has a basic thickness of, for example, 0.6 mm or less. By the way, "basic thickness" means the standard thickness of a product, and this thickness is the thickness most adopted for the entire product. Incidentally, the mold according to the invention can also cast products with a basic thickness exceeding 0.6 mm.

As shown in FIG. 1 , the mold 1 includes a fixed mold 31 , and a movable mold 32 to be combined with the fixed mold 31 . The fixed mold 31 is fixed to a fixed plate not shown. The fixed mold 31 includes a fixed plate 33 , a cavity member 34 and an inlet member 35 .

The fixed die 33 is fixed to the fixed plate, and includes a recess (not shown) on the surface facing the movable die 32 . A cavity member 34 is attached to the recessed portion, and is opposed to the movable die 34 . The cavity member 34 contains mold surfaces for forming, for example, the outer surface of the cast product 2 . The inlet member 35 includes a through hole into which an injection plunger of the casting machine is inserted and which has a cylindrical shape.

On the other hand, the movable mold 32 includes a movable template 36 , a core member 37 and a splitter 38 . The movable mold 32 is fixed to a movable plate (not shown), and advances and retreats between a mold-closed position where the movable mold is combined with the fixed mold 31 and a mold-open position where the movable mold 32 separates with fixed mold 31.

The movable template 36 is fixed to the movable plate, and includes a recessed portion 36 a on a surface opposite to the fixed mold 31 . The core member 37 is attached to the recessed portion 36 a, and is opposed to the fixed mold 31 . The core member 37 comprises a mold surface for forming, for example, the inner surface of the cast product 2 .

When the movable die 32 is combined with the fixed die 31 , as shown in FIG. 3 , an inner space into which molten metal is extruded is formed between the fixed die 31 and the movable die 32 . FIG. 3 is a diagram obtained by viewing the internal space 41 as a plane for convenience of explanation. In Figure 3, the flow of molten metal is from top to bottom in the figure. Incidentally, in this description, when the term "upstream side" is simply used, it means the upstream side relative to the main flow flow of molten metal, and when the term "downstream side" is simply used, it means the side relative to The downstream side of the main flow stream of molten metal. Here, the main flow of molten metal refers to the molten metal flowing through the main gate, which will be described below.

As shown in Figure 3, the inner space 41 in the mold 1 comprises a blank material portion 42, a product portion 43, a fan gate (fan gate) 44, a first side gate 45a, 45b, a second side gate 46a, 46b, Overflow section 47 and cooling section (chillvent section) 48. More specifically, the fan gate 44 includes a sprue 51 and a main gate 52 . Each of the first side gates 45 a , 45 b includes a first sub-runner 53 and a first sub-gate 54 . Each of the second side gates 46 a , 46 b includes a second sub-runner 55 and a second sub-gate 56 .

The billet part 42 is formed inside the inlet member 35, and receives high-speed high-temperature molten metal from an injection device of a casting machine. That is, the billet portion 42 is a portion into which molten metal is injected. The product portion 43 is an inner space in which the cast product 2 is to be cast, and includes a dug-down surface corresponding to the shape of the cast product 2 . As shown in FIG. 3 , the product part 43 includes first to fourth edge parts 61 , 62 , 63 and 64 corresponding to the four sides of the cast product 2 .

The first edge portion 61 is an example of the main edge portion mentioned in the present invention. The first edge portion 61 is located most upstream of the product portion 43 and corresponds to the first end portion 13 of the cast product 2 . The first edge portion 61 is connected to the main gate 52 . The second edge portion 62 is located most downstream in the product portion 43 and corresponds to the second end portion 14 of the cast product 2 . Each of the third and fourth edge portions 63 and 64 is an example of a side edge portion mentioned in the present invention. The third and fourth edge portions 63 and 64 extend from the end portion of the first edge portion 61 along the flow direction of the molten metal (ie, the flow direction of the main flow of the molten metal), and correspond to the side edge portions 15 and 15 of the cast product 2 . 16.

As shown in FIG. 3 , the product portion 43 includes a main product portion 66 and a pair of protrusions 67 a and 67 b. The main product portion 66 is a space in which the main body portion 21 of the cast product 2 is cast. The protrusions 67a and 67b protrude from the main product part 66 toward the billet part 42 side, and are spaces in which the protrusions 22a and 22b of the cast product 2 are cast.

The first edge portion 61 of the product portion 43 is cut off toward the second edge portion 62 . As a result of this, the corner portion defined by the first edge portion 61 and the third and fourth edge portions 63 and 64 includes a pair of protrusions 67a and 67b. As shown in FIG. 3 , the protruding portions 67 a and 67 b are arranged on the blank portion 42 side of the main product portion 66 (ie, on the upstream side).

A pair of protruding portions 67 a and 67 b are formed separately from each other at, for example, both end portions of the first edge portion 61 . The first edge portion 61 includes a first portion 61a which is a central portion other than the protrusions 67a and 67b, and second portions 61b and 61c in which the protrusions 67a and 67b are respectively provided.

As shown in FIG. 3 , the fan gate 44 is a flow path for guiding the main flow of molten metal to the product part 43 . As described above, the fan gate 44 includes the sprue 51 and the main gate 52 . The sprue 51 is continuous with the billet portion 42 and is configured to guide molten metal injected into the billet portion 42 from the billet portion 42 toward the first portion 61a of the first edge portion 61 of the product portion 43 (ie, the main product portion 66 ). . The sprue 51 includes an upstream portion 51 a connected to the billet portion 42 and a downstream portion 51 b connected to the main gate 52 . The downstream portion 51 b of the sprue 51 is greatly widened compared to the upstream portion 51 a so that the molten metal is guided toward substantially all of the first portion 61 a of the first edge portion 61 .

As shown in FIG. 3 , the main gate 52 is provided between the sprue 51 and the first portion 61 a of the first edge portion 61 of the product portion 43 . The thickness of the main gate 52 is made smaller than the thickness of the sprue 51 . The thickness of the main gate 52 is sharply reduced at a position close to the product portion 43 so that the molten metal flow is accelerated toward the product portion 43 . The main gate 52 has, for example, a thickness substantially equal to the basic thickness (for example, 0.6 mm) of the cast product 2 at the smallest cross-sectional portion of the main gate 52 . The main gate 52 is provided, for example, on an extension of the portion where the bottom wall 11 of the cast product 2 is to be formed.

The boundary between the main gate 52 and the first portion 61 a of the first edge portion 61 of the product portion 43 becomes a filling port 71 for the main flow of molten metal of the product portion 43 . That is, the main gate 52 communicates with the product part 43 at a position located on the downstream side of the protruding parts 67a and 67b.

As shown in FIG. 3 , the first side gates 45 a , 45 b are auxiliary flow paths for performing flow support for the product portion 43 . As described above, each of the first side gates 45 a , 45 b includes the first sub-runner 53 and the first sub-gate 54 . The first sub-runner 53 is an example of the first runner mentioned in the present invention. The first sub-gate 54 is an example of the first gate mentioned in the present invention. Incidentally, the first side gates 45a, 45b may be provided only at one side, that is, at one of the left and right sides according to the shape of the product.

As shown in FIG. 3 , the first sub-runner 53 is branched from both sides of the main channel 51, and bypasses the product portion 43, and extends along the third and fourth edge portions 63 and 64 on both sides of the product portion 43. . The first sub-runner 53 is configured to guide the molten metal injected into the billet part 42 toward the third and fourth edge parts 63 and 64 of the main product part 66 .

The first sub-gate 54 is provided between the first sub-runner 53 of the product part 43 and the third and fourth edge parts 63 and 64 (ie, the main product part 66 ), and supplies molten metal from the side part to the main part. Products Division 66. The thickness of the first sub-gate 54 is made smaller than the thickness of the first sub-runner 53 .

More specifically, at the end portion on the filling end side of the product portion 43 , the first sub-gate 54 is connected to, for example, third and fourth edge portions 63 and 64 . The boundary between each first sub-gate 64 and each of the third and fourth edge portions 63 and 64 becomes the molten metal filling port 72 of the product portion 43 . That is, the first sub-gate 54 communicates with the product portion 43 at a position on the downstream side of the protruding portions 67a, 67b in the flow direction of molten metal.

As shown in FIG. 3 , the second side gates 46 a , 46 b are auxiliary flow paths for performing flow support of the protruding portions 67 a , 67 b of the product portion 43 . As described above, each of the second side gates 46 a , 46 b includes the second sub-runner 55 and the second sub-gate 56 . The second sub-runner 55 is an example of the second runner mentioned in the present invention. The second sub-gate 56 is an example of the second gate mentioned in the present invention.

The second sub-runner 55 diverges from both sides of the main runner 51 at a position upstream of the first sub-runner 53 in the flow direction of molten metal, and extends toward the protrusions 67 a and 67 b of the product part 43 . The second sub-runner 55 is configured to guide the molten metal injected into the billet part 42 toward the protruding parts 67 a , 67 b of the product part 43 .

FIG. 4 shows in detail the sub-runner 55 of a second side gate 45a. Incidentally, the other second side gate 45b also has substantially the same configuration. As shown in FIG. 4 , the second sub-runner 55 includes a first portion 81 , a second portion 82 and a third portion 83 . The first portion 81 is branched from the main channel 51 and extends, for example, parallel to the first sub-channel 53 .

Here, as shown in FIG. 4 , the first sub-runner 53 is provided at a position that is three-dimensionally deviated from the main gate 52 . Incidentally, the expression “stereoscopic deviation” means deviation in the thickness direction of the mold 1 . The first portion 81 of the second sub-runner 55 is disposed on the same plane as the first sub-runner 53 .

The second portion 82 of the second sub-runner 55 is disposed on the downstream side of the first portion 81 . The second portion 82 is provided at a position that is three-dimensionally deviated from the first portion 81 . The second portion 82 extends, for example, perpendicularly to the first portion 81 and crosses the first sub-runner 53 .

The second portion 82 is disposed at a position three-dimensionally deviated from the first sub-runner 53 to avoid the first sub-runner 53 , and thus the second portion 82 straddles the first sub-runner 53 . More specifically, the first sub-runner 53 is engraved on the core member 37 of the movable mold 32, for example. The second sub-runner 55 is, for example, engraved on the cavity member 31 of the fixed mold 31 . That is, the first and second sub-runners 53 and 55 extend in directions different from each other, and the parting line of the mold 1 serves as a boundary of the first and second sub-runners 53 and 55 . The parting line is a boundary surface between the fixed die 31 and the movable die 32 . The first and second sub-runners 53 and 55 are in contact with each other at the crossing portion.

The first portion 81 includes an extension portion 81 a extending from a portion where the second portion 82 diverges from the first portion 81 . The extended portion 81a has a function of absorbing vibrations to absorb the impact of the flow of molten metal. The third portion 83 extends, for example, in a direction perpendicular to the second portion 82 .

As shown in FIG. 3 , the second sub-gate 56 is provided between the second sub-runner 55 and the protrusions 67a, 67b of the product part 43, and directly supplies molten metal to the protrusions 67a, 67b. The thickness of the second sub-gate 56 is made smaller than the thickness of the second sub-runner 55 .

As shown in FIG. 3 , an overflow portion 47 and a cooling portion 48 are provided on the downstream side of the product portion 43 . The overflow portion 47 is a portion for receiving air in the product portion 43 pushed out by molten metal. The overflow portion 47 is a portion for reducing the filling resistance of the molten metal in the product portion 43 , and pushes the deteriorated molten metal at the flow front out of the product portion 43 . The cooling portion 48 is a portion having a function of preventing degraded molten metal from running out of the mold 1 .

Next, an example of a method of manufacturing a cast product 2 using the mold 1 will be described.

First, the mold 1 as described above is prepared, and the mold 1 is set on a casting machine. Further, raw materials (for example, magnesium alloy) are melted to obtain molten metal. Next, the casting cycle begins. First, the movable mold 32 is moved to be combined with the fixed mold 31, and then the mold 1 is clamped. Next, the molten metal is poured into the sleeve coupled to the inlet member 35 , the injection piston is pressed out at high speed, and the molten metal is injected into the billet portion 42 of the mold 1 .

When the solidification of the cast product 2 proceeds to a certain extent, the movable mold 32 moves to open the mold 1, and the cast product 2 is taken out of the mold 1 by the eject pin. As a result, one cycle of die casting is completed. The cast product 2 taken out of the mold 1 is subjected to a process of removing excess portions, thereby obtaining a cast product 2 having a desired shape.

Next, the function of the mold 1 will be described below.

The molten metal entering the billet portion 42 first fills into the sprue 51 having a relatively large flow cross-sectional area. Subsequently, the molten metal flows into the first and second sub-runners 53 and 54 which also have relatively large flow cross-sectional areas. The molten metal flowing through the sprue 51 is filled into the main product portion 66 of the product portion 43 through the main gate 52 directly connected to the sprue 51 . Further, the molten metal flowing through the second sub-runner 55 is filled into the protrusions 67 a and 67 b of the product part 43 through the second sub-gate 56 . Further, molten metal flowing through the first sub-runner 53 is filled from the third and fourth edge portions 63 and 64 of the product portion 43 through the first sub-gate 54 .

At this time, the second sub-runner 55 straddles the first sub-runner 53 , so the molten metal flowing through the second sub-runner 55 hardly interferes with the molten metal flowing through the first sub-runner 53 . That is, the molten metal flowing through the second sub-runner 55 is filled into the protrusions 67a and 67b of the product part 43 without causing too much pressure loss.

According to the mold 1 configured as described above and the method of manufacturing the cast product 2, defective casting can be reduced. FIG. 5 shows the mold 91 without the second sub-runner 55 and the second sub-gate 56 . Here, the flow of magnesium alloy or similar molten metal is highly directional due to gravity. For this reason, when the mold 91 as described above is used, the upstream side corner portion 92 (shaded portion in FIG. 5 ) of the product portion 43 including the protruding portions 67a and 67b is not sufficiently filled with molten metal in many cases. . That is, there may be a rough/fine filled state of the upstream side corner portion 92, resulting in defective casting problems such as lack of strength.

FIG. 6 shows a mold 91 in which the second sub-gate 56 is provided at the middle portion of the sub-runner 53 to perform flow support for the main product portion 66 . Even when the mold 91 as described above is used, the molten metal has high directivity, and thus the molten metal flowing through the first sub-runner 53 passes through the inlet of the second sub-gate 56 having a small cross-sectional area. 93, and flow toward the distal end of the first secondary channel 53. For this reason, there is a possibility that the molten metal filled from the second sub-gate 56 into the protrusions 67a, 67b is insufficient and defective filling is not resolved. Further, after the filling of the first sub-runner 53 having a relatively large cross-sectional area is completed, the molten metal flowing into the protrusions 67 a and 67 b passes through the second sub-gate 56 , and thus is different from the filling from the main gate 52 . The filling start time from the second sub-gate 56 is delayed compared to the start time. For this reason, air tends to leave the left side of the product section 43, so there is a possibility of defective casting due to gas inclusions or the like.

FIG. 7 shows a mold 91 provided with the second sub-runner 55 and the second sub-gate 56 . As shown in FIG. 7, the first and second sub-runners 53 and 55 are arranged on the same plane and cross each other on the same plane. When such a die 91 is used, the molten metal flowing through the first sub-runner 53 and the molten metal flowing through the second sub-runner 55 interfere with each other at the intersection of the sub-runners 53 and 55 , resulting in pressure loss. Therefore, there is a possibility that molten metal is not sufficiently supplied from the second sub-gate 56 to the protrusions 67a and 67b. Further, there is also the possibility of casting defects such as molten metal wrinkles induced by gas inclusions or turbulent flow caused by interference.

On the other hand, in the mold 1 according to the present embodiment, when the second runner 55 for guiding the molten metal to the protruding parts 67a, 67b is provided to be different from the first runner for guiding the molten metal to the main product part 56 53 is separated, and the second flow channel 55 spans the first flow channel 53 three-dimensionally, the molten metal flowing through the second flow channel 55 hardly interferes with the molten metal flowing through the first flow channel 53, and it is difficult to cause pressure loss. Therefore, it is possible to supply sufficient molten metal to the protrusions 67a, 67b which cannot be easily filled with molten metal, and prevent defective casting due to insufficient filling. Further, if the molten metal flowing through the second bead 55 and the molten metal flowing through the first bead 53 hardly interfere with each other, defective casting such as molten metal wrinkles accompanying the interference can be prevented from occurring.

In the case where the second sub-runner 55 for guiding the molten metal to the protrusions 67a, 57b is provided separately from the first sub-runner 53 for guiding the molten metal to the main product part 66, the second sub-runner can be The port 56 starts filling without waiting for the filling of the first sub-runner 53 . That is, it is even possible to make the filling start timing from the second sub-gate 56 earlier than the mold 91 shown in FIG.

In the case where the first and second sub-runners 53 and 55 extend in different directions from each other and the parting line of the mold 1 serves as the dividing line, cubic interchange of the two runners can be achieved relatively simply. , without setting a relatively complex shape on the mold surface of the mold 1 .

In the case where the second sub-runner 55 is branched from the main flow channel 51 at a position on the upstream side of the first sub-runner 53 , the molten metal is sufficiently supplied to the second sub-runner 55 that requires more molten metal than the second sub-runner 55 . A secondary runner 53 becomes easier. This helps reduce defective casting.

The casting method of the mold 1 and the cast product 2 according to one embodiment has been described above. However, the present invention is not limited to the above embodiments, and constituent elements may be modified and implemented within a range not departing from the gist of the present invention at the implementation stage of the present invention.

Although in the above embodiment, two second side gates are provided, one side gate may be used depending on the shape of the product. Incidentally, in the above embodiments, the first sub-runner is the first runner mentioned in the present invention, and the first sub-gate is the first gate mentioned in the present invention. However, alternatively, the sprue may be the first runner of the present invention, and the main gate may be the first gate of the present invention. In this case, the second runner spans the main runner three-dimensionally.

Additional advantages and modifications will readily occur to those skilled in the art. Therefore, the invention in its broader aspects is not limited to the specific details and representative embodiments shown and described herein. Accordingly, various modifications may be made without departing from the spirit and scope of the main inventive concept of the invention as defined by the appended claims and their equivalents.

Claims (5)

1. A mold for die-casting, characterized in that it comprises: fixed mold (31); and The movable mold (32) that will combine with this fixed mold (31), wherein When the movable mold (32) is combined with the fixed mold (31), the blank part (42), the product part (43), the first runner (53), the first gate (54), the second A second runner (55) and a second gate (56) are formed between the movable mold (32) and the fixed mold (31), The billet portion (42) is a portion into which molten metal is to be poured, The product part (43) includes a main product part (66) and a protruding part (67a, 67b), and the protruding part (67a, 67b) is directed from the main product part (66) toward the side of the blank part (42) protrude, The first runner (53) is configured to guide the molten metal injected into the billet part (42) toward the main product part (66), The first gate (54) is provided between the first runner (53) and the main product part (66), on the downstream side of the protruding part (67a, 67b) in the flow direction of the molten metal. s position, The second runner (55) is configured to guide the molten metal injected into the billet portion (42) toward the protruding portion (67a, 67b), The second gate (56) is arranged between the second runner (55) and the protrusion (67a, 67b), and the second runner (55) is arranged in a three-dimensional deviation from the first The flow channel (53) and the position across the first flow channel (53). 2. The mold according to claim 1, characterized in that, A sprue (51) and a main gate (53) are formed between the fixed mold (31) and the movable mold (32), and the sprue (51) is configured to pass from the blank part (42) ) directing molten metal towards said main product section (66), and The main gate (52) is disposed between the sprue (51) and the main product part (66), the product part (43) comprising a main edge connected to the main gate (52) part (61), and side edge parts (63, 64) extending from the ends of said main edge part (61) along the flow direction of molten metal, The first flow channel (53) is a first secondary flow channel branched from the main channel (51), extends along side edge portions (63, 64) of the product part (43), and is configured to face said side edge portions (63, 64) guide the molten metal, and The second flow path (55) is a second sub-flow path branched from the main flow path (51), and is configured to guide molten metal toward the protruding portion (67a, 67b) of the product portion (43). 3. Mold as claimed in claim 2, characterized in that, The first flow channel (53) and the second flow channel (55) extend along different directions from each other, and the parting line of the mold serves as a dividing line. 4. The mold of claim 3, wherein: The second flow path (55) is branched from the main flow path (51) at a position on the upstream side of the first flow path (53) in the flow direction of molten metal. 5. A method of manufacturing cast products by die casting, characterized in that it comprises: Prepare a mold comprising a fixed mold (31) and a movable mold (32) to be combined with said fixed mold (31), and in said mold, when said movable mold (32) is combined with said fixed mold When the mold (31) is combined, the blank part (42), the product part (43), the first runner (53), the first gate (54), the second runner (55) and the second gate (56) Formed between the movable die (32) and the fixed die (31), (i) the billet portion (42) is a portion into which molten metal is injected, (ii) the product portion (43 ) including a main product part (66) and protruding parts (67a, 67b) protruding from the main product part (66) toward the side of the billet part (42), (iii) the structure of the first runner (53) In order to guide the molten metal injected into the billet part (42) toward the main product part (66), (iv) the first gate (54) is arranged between the first runner (53) and the main Between the product parts (66), at a position on the downstream side of the protruding part (67a, 67b) in the flow direction of the molten metal, (v) the second flow path (55) is configured to face the protruding part (67a, 67b) guide the molten metal injected into the billet part (42), (vi) the second gate (56) is provided between the second runner (55) and the protruding part (67a, 67b), and (vii) the second flow channel (55) is arranged at a position that is three-dimensionally deviated from the first flow channel (53) and crosses the first flow channel (53); Combining said movable mold (32) and fixed mold (31); and Molten metal is injected into the billet portion (42).

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