JP7123390B2 - Chill vent and mold equipment - Google Patents

Description

The present invention relates to chill vent and mold apparatus.

Die casting is known as a metal casting method. In die casting, a product is manufactured using a mold apparatus having a fixed mold and a movable mold. In this type of mold apparatus, a fixed mold and a movable mold are closed to form a cavity between the pair of molds. Molten metal is introduced into this cavity through a sprue or a runner, and the introduced molten metal solidifies in the cavity to obtain a molded product.

If gas remains in the cavity during die casting, there is a concern that the yield of the product may decrease due to the occurrence of blowholes inside the product or the deterioration of the molding accuracy. Therefore, conventionally, in a mold apparatus, a chill vent having a meandering degassing passage inside has been arranged as a degassing device on the downstream side of the cavity (see, for example, Patent Document 1). In a mold apparatus provided with a chill vent, the chill vent discharges the gas in the cavity and rapidly cools the molten metal, thereby suppressing the ejection (flash) of the molten metal from the cavity. Patent Document 1 discloses a chill vent made of beryllium copper, which is a material with high thermal conductivity and high hardness.

However, since beryllium copper is an expensive material, the use of beryllium copper makes chill vents more expensive, and there is concern that application to mold devices will be restricted and product prices will rise.

In order to address such inconveniences, it has been proposed to manufacture chill vents using pure copper, which is less expensive than beryllium copper and has high thermal conductivity (see, for example, Patent Document 2). Patent Document 2 discloses a chill vent in which the entire passage surface of the gas venting passage that contacts the molten metal is made of pure copper, and an iron plate is provided on the opposite side of the gas venting passage and in contact with the mold. is disclosed. According to the chill vent described in Patent Document 2, it is said that cooling performance can be enhanced by using pure copper, and strength can be imparted by forming the back surface of the copper with an iron plate.

Japanese Patent No. 3423873 Japanese Patent No. 4456014

The molten metal filling the cavity at high speed enters the gas vent passage at high speed. Although pure copper has high thermal conductivity and excellent cooling performance, it has insufficient hardness and is inferior in mechanical strength. Therefore, when the entire passage surface of the gas venting passage is formed of copper as in Patent Document 2, the passage surface is eroded by the molten metal when high-speed and high-temperature molten metal collides vigorously against the passage surface of the gas venting passage. There is a risk that it will be easily worn out (easily melted). In this case, there is concern that the product life of the chill vent will be shortened.

SUMMARY OF THE INVENTION The main object of the present invention is to provide a chill vent that can suppress melting damage while using inexpensive materials and has excellent cooling performance, and a mold apparatus equipped with the chill vent. and

A first configuration includes a first block and a second block, and the first block and the second block are separated from a closed state in which the first block and the second block are arranged side by side and combined. A chill vent operable to a spaced apart mold open condition. In this first configuration, the first block and the second block each have a steel-forming portion made of steel and a copper-forming portion made of pure copper. A gas passage is formed between the block and the second block, and communicates the cavity of the mold with the outside to discharge the gas in the cavity to the outside. The surfaces of the first block and the second block facing each other have uneven portions in which a plurality of peaks and valleys are alternately arranged along the flow direction of the gas. The steel-forming portion is located most upstream in the direction, and the copper-forming portion is located downstream of the most upstream portion.

In the above-described first configuration, the most upstream portion of the uneven portions provided in the gas passage portion is formed of steel, which is a material with high hardness, and a relatively inexpensive but heat-releasing portion is located downstream of the most upstream portion. A portion made of pure copper, which is a material with high conductivity, was arranged. According to this configuration, the inlet portion of the concave and convex portion, where the high-temperature and high-speed molten metal from the cavity directly hits the passage surface, is made of steel with high hardness, thereby reducing the temperature of the molten metal introduced from the cavity. It is possible to suppress the melting damage of the gas passage portion due to the high-temperature and high-speed molten metal while promoting the decrease. Also, by arranging the copper forming section downstream of the inlet section, the molten metal that has passed through the steel forming section and whose temperature and flow rate have been somewhat reduced can be rapidly cooled by the copper forming section. As a result, it is possible to suppress the injection of the molten metal from the mold device. That is, according to the first configuration, it is possible to provide a chill vent that can suppress melting damage and has excellent cooling performance while using inexpensive materials.

A second configuration is, in the first configuration, formed in one of the first block and the second block, and by introducing the molten metal from the cavity into the gas passage portion and solidifying it. An insertion hole is provided through which an extrusion pin for pushing out the formed solidified product from the one block toward the other block in the mold open state is inserted, and the insertion hole is provided inside the one block and the other block. It is formed to communicate with the gas passage portion from the side opposite to the block, and has a downstream side insertion hole as the insertion hole, at least a part of which is arranged in the copper forming portion, and the downstream side insertion hole is formed. A cylindrical body made of steel is arranged on the inner periphery of the hole.

While pure copper is relatively inexpensive and has high thermal conductivity, it has the disadvantage of not being sufficiently high in mechanical strength. Therefore, in the chill vent, if an insertion hole for inserting an ejector pin for removing the solidified matter of the molten metal in the gas passage portion is arranged in the copper forming portion, the opening of the insertion hole on the side of the gas passage portion is likely to be melted. There is concern that Further, there is a concern that repeated sliding of the ejector pin inside the insertion hole may promote damage and deterioration of the inner peripheral surface of the insertion hole. In view of this point, according to the second configuration, the cylindrical body formed of steel is disposed on the inner peripheral portion of the downstream insertion hole, so that a part of the uneven portion is the copper-forming portion. Even when the copper is formed, damage and deterioration at the copper-forming portion can be suppressed, and durability can be ensured.

In a third configuration, in the first or second configuration, a boundary between the steel-forming portion and the copper-forming portion of the uneven portion is arranged at the valley portion of the uneven portion.

When the boundary between the steel-forming portion and the copper-forming portion is arranged at the mountain portion, there is a concern that the strength of the boundary portion may be lowered due to the boundary being arranged at the mountain portion, which is structurally relatively fragile. In this case, there is concern that the boundary between the steel-forming portion and the copper-forming portion is likely to be eroded, and the life of the product is likely to be shortened. On the other hand, as in the third configuration, by arranging the boundary between the steel forming portion and the copper forming portion at the position of the valley portion of the uneven portion, the uneven portion is made of different materials in the flow direction of the molten metal. Even when it is formed, it is possible to sufficiently suppress a decrease in the strength of the uneven portion.

In a fourth configuration, in any one of the first to third configurations, the steel-forming portion has a downstream portion of the facing surface in the flow direction where the first block and the second block face each other. The base member is formed of a block-shaped steel base member having a recess recessed on the side opposite to the side, the copper forming portion is formed of a copper plate having the same thickness as the depth of the recess, and the first block and the second Each of the two blocks is formed by placing the copper plate in the recess and integrating the base member and the copper plate.

According to the fourth configuration, while one plate surface of the copper plate is in contact with the molten metal, a member made of steel is arranged on the other plate surface side of the copper plate, so that the copper plate flows the molten metal. It is possible to sufficiently ensure the strength of the chill vent while promoting cooling. In addition, since it can be attached to the mold device not by the copper plate but by using the steel forming part located on the opposite side of the copper plate from the gas passage part, for example, when performing maintenance or replacement of the chill vent, It is possible to avoid interference between a copper plate with low hardness and a fixture (such as a screw).

A fifth configuration includes the chill vent of any one of the first to fourth configurations and a mold in which the cavity is formed in the mold closed state, and the chill vent is arranged downstream of the cavity. ing. According to the fifth configuration, by providing the chill vent of any one of the first to fourth configurations, the same effects as those of the first configuration can be obtained.

Sectional drawing which shows a die-cast apparatus. 4 shows the configuration of a fixed block and a movable block; (a) is a plan view of the die matching surface of the fixed block as seen from the movable block side, and (b) is a plan view of the die matching surface of the movable block as seen from the fixed block side. 4 shows the configuration of a fixed block and a movable block; 2(a) is a sectional view taken along line AA of the fixed block shown in FIG. 2(a), and FIG. 2(b) is a sectional view taken along line BB of the movable block shown in FIG. 2(b). FIG. 4 is an enlarged cross-sectional view showing the configuration of the concave and convex portions of the chill vent and the ejector pin; Sectional drawing which shows the movable block in other embodiment.

Embodiments of the chill vent and mold apparatus are described below. In this embodiment, a mold device is embodied as a die casting device having a fixed mold and a movable mold. The die casting apparatus of this embodiment is used when manufacturing cast products made of aluminum.

As shown in FIG. 1, a die casting apparatus 10 includes a fixed die 11 and a movable die 12 as dies. The movable mold 12 is provided movably in directions approaching and separating from the fixed mold 11 . When the fixed mold 11 and the movable mold 12 are integrally combined and closed, a cavity 13 is formed between the fixed mold 11 and the movable mold 12 into which molten metal is injected to cast a product. be. Note that FIG. 1 shows the die casting apparatus 10 in a mold closed state. Hereinafter, unless otherwise specified, it refers to the configuration of the die casting apparatus 10 in the mold closed state.

The fixed mold 11 is made of a steel block and attached to a mounting portion (not shown) of the die casting machine 10 . A housing recess 14 recessed toward the fixed mold 11 is formed in a portion of the fixed mold 11 facing the movable mold 12 side. The fixed mold 11 is provided with a sprue 15 for pouring molten aluminum into the cavity 13 , and a sleeve 16 is connected to the sprue 15 . When the molten metal is extruded from the sleeve 16 while the mold is closed, the molten metal is led to the cavity 13 through the sprue 15 .

The movable die 12 is made of a steel block and attached to a mounting portion (not shown) of the die casting machine 10 . By driving the mounting portion, the movable mold 12 can move in a direction toward and away from the fixed mold 11 (hereinafter referred to as a "mold opening/closing direction"). By moving the movable mold 12 away from the fixed mold 11, the die casting apparatus 10 is opened. In addition, when the movable mold 12 moves toward the fixed mold 11 in the mold open state, the die casting apparatus 10 enters the mold closed state.

The movable mold 12 is formed with a runner 17 for pouring molten aluminum into the cavity 13 . Molten metal is guided from the sprue 15 to the runner 17 , and the guided molten metal is injected into the cavity 13 through the runner 17 .

On the surface of the movable mold 12 facing the fixed mold 11, a raised portion 18 that protrudes toward the fixed mold 11 is formed. A peripheral portion of the raised portion 18 in the movable mold 12 and a peripheral portion of the accommodation recess 14 in the fixed mold 11 are in contact with each other, so that the protrusion 18 and the accommodation recess 14 are formed so as to face each other with the gap 19 therebetween. there is The molten metal from the sleeve 16 is injected into this gap 19 (that is, the cavity 13) and solidified to produce a molded product.

The movable mold 12 is provided with a push-out mechanism 28 for taking out the product formed by solidifying the molten metal in the cavity 13 from the die casting apparatus 10 . The pushing mechanism 28 includes a pushing plate 26 and pushing pins 27 . The ejection plate 26 is arranged on the opposite side of the movable die 12 from the fixed die 11 side, and has a plurality of ejection pins 27 attached thereto. Each ejector pin 27 extends from the ejector plate 26 toward the stationary die 11 side. The ejector plate 26 is connected to a driving device (not shown), and is movable in the same direction as the direction in which the fixed mold 11 and the movable mold 12 are aligned, that is, the mold opening/closing direction. When the ejector pin 27 is moved toward the stationary mold 11 in the mold open state, the ejector pin 27 protrudes toward the peripheral edge of the raised portion 18 to eject the molded product. Thereby, the product is taken out from the die casting apparatus 10 .

A groove portion (not shown) extending from the cavity 13 toward the outside is formed on the surface of the movable mold 12 facing the fixed mold 11 . The groove linearly extends from the cavity 13 toward the outer edge of the movable mold 12 . This groove forms a gap 21 communicating with the outside between the movable mold 12 and the fixed mold 11 in the mold closing state. In the die casting machine 10 , gas in the cavity 13 passes through the gap 21 and is discharged to the outside from an opening provided on the outer edge of the die casting machine 10 .

The die casting apparatus 10 is provided with a chill vent 50 as a degassing device for degassing while suppressing ejection (flash) of molten metal at a gas outlet portion from the gap 21 . The configuration of the chill vent 50 will be described below with reference to FIGS. 1 to 4. FIG.

In the following description of the chill vent 50, for the sake of convenience, the upward direction and the downward direction are defined based on the state in which the chill vent 50 is attached to the die casting apparatus 10. As shown in FIG. That is, the flow direction of the molten metal corresponds to the "vertical direction", the upstream side in the flow direction of the molten metal corresponds to the "lower side", and the downstream side in the flow direction of the molten metal corresponds to the "upper side". F shown in FIG.2 and FIG.3 represents a lower side, B represents an upper side.

The chill vent 50 has two metal block bodies, and these block bodies are combined (see FIG. 1). The chill vent 50 includes a fixed block 51 and a movable block 52 as the block bodies. Note that the fixed block 51 and the movable block 52 correspond to the "first block" and the "second block", respectively.

The fixed block 51 is fixed in a state in which it is fitted in the accommodation groove 24 for chill vent formed in the fixed mold 11 . The movable block 52 is fixed in a state of being fitted in a chill vent receiving groove 25 formed in the movable mold 12 . The movable block 52 can move toward or away from the fixed block 51 as the movable mold 12 moves relative to the fixed mold 11 . In a state where the fixed mold 11 and the movable mold 12 are integrally combined to form the cavity 13, the fixed block 51 and the movable block 52 are also integrally combined to be in a closed state (see FIG. 1). .

A gap 53 is formed between the fixed block 51 and the movable block 52 in the mold closed state. The gap 53 is connected at its lower end to the gap 21 formed between the movable mold 12 and the fixed mold 11 . The upper end of the gap 53 is connected to the outside. A lower end portion of the gap 53 is connected to a linear portion of the gap 21 formed between the movable mold 12 and the fixed mold 11 . These gaps 21 and 53 form a degassing passage 22 that communicates the cavity 13 in the die casting apparatus 10 with the outside.

As shown in FIG. 3( a ), the fixed block 51 includes a base member 54 and a copper plate 55 . The base member 54 is a block made of steel and has an L-shaped cross section as a whole. Specifically, the base member 54 has a pedestal portion 56 and a back plate portion 57, which are integrally formed. The pedestal portion 56 has a block shape with a predetermined height and constitutes the lower portion of the fixed block 51 .

The back plate portion 57 has a thickness D1 and is arranged at the end portion opposite to the movable block 52 in the mold opening/closing direction. The back plate portion 57 extends upward from the surface of the base portion 56 facing upward (hereinafter referred to as “upper surface 58 ”), and constitutes a part of the upper portion of the fixed block 51 . A surface 59 of the back plate portion 57 facing the movable block 52 side faces the movable block 52 side (hereinafter referred to as a “mating surface 61”) of the pedestal portion 56 in a direction facing the movable block 52. It is arranged at a position retracted by a length D2 on the opposite side. As a result, the base member 54 is formed with a concave portion 49 recessed in the opposite direction to the direction toward the movable block 52 from the middle height position in the vertical direction to the upper end portion.

The copper plate 55 is made of pure copper and has a thickness (D2) equal to the length D2, and has a size and shape corresponding to the recess 49 of the base member 54. As shown in FIG. Here, "pure copper" is not limited to those with a purity of 100%. good. Pure copper includes, for example, tough pitch copper, deoxidized copper and oxygen-free copper.

The copper plate 55 is incorporated in the recess 49 of the base member 54 . With the copper plate 55 incorporated in the recess 49, the fixing block 51 as a whole has a substantially rectangular parallelepiped shape. An upper surface 58 of the pedestal portion 56 of the base member 54 serves as a mounting surface on which the copper plate 55 is mounted. As a result, the base member 54 and the copper plate 55 are arranged side by side in the vertical direction while being adjacent to each other, and the base member 54 supports the copper plate 55 . When the copper plate 55 is placed on the upper surface 58, the surface of the copper plate 55 facing the movable block 52 (hereinafter referred to as the "mating surface 62") and the mating surface 61 of the pedestal 56 are continuous in the vertical direction. It has a flat surface.

The thickness (length D2) of the copper plate 55 is 1/4 or more, preferably 1/2, of the thickness D3 of the fixed block 51 (that is, the sum of the thickness of the back plate portion 57 and the thickness of the copper plate 55). That's it. In this embodiment, the thickness D3 of the fixed block 51 is 5 cm, and the thickness (length D2) of the copper plate 55 is 3 cm.

The copper plate 55 is fixed to the base member 54 by screws 63 while being incorporated in the base member 54 . Specifically, an insertion hole 64 for inserting a screw 63 is formed in the back plate portion 57 of the base member 54 (see FIG. 3A). In this embodiment, a plurality of (two in this embodiment) insertion holes 64 are arranged side by side at predetermined intervals in the vertical direction. Further, fixing holes 65 are formed in the copper plate 55 at positions corresponding to the insertion holes 64 . In the base member 54 , a screw 63 is inserted through each insertion hole 64 , and each screw 63 is screwed into a fixing hole 65 , whereby the copper plate 55 is integrated with the base member 54 .

Positioning pins 66 are attached to the back plate portion 57 of the base member 54, and insertion holes 67 are formed in the copper plate 55 at positions corresponding to the pins 66 (see FIG. 3A). ). When attaching the copper plate 55 to the base member 54, the copper plate 55 can be positioned with respect to the base member 54 by inserting the pins 66 into the insertion holes 67 before screwing the base member 54 and the copper plate 55 together. It has become.

The base member 54 (specifically, the back plate portion 57) is formed with screw holes 68 at a plurality of locations (two locations in this embodiment) for attaching the fixed block 51 to the fixed mold 11 (Fig. 2(a) and FIG. 3(a)). The screw hole 68 penetrates the back plate portion 57 in its thickness direction (mold opening/closing direction). However, the screw holes 68 are not formed in the copper plate 55 . The fixing block 51 is attached to the fixed mold 11 by inserting screws (not shown) into these screw holes 68 from attachment portions provided on the fixed mold 11 side and screwing them.

A surface of the fixed block 51 facing the movable block 52 (hereinafter referred to as a “mold matching surface 69”) has an uneven portion 70 . Specifically, as shown in FIG. 2(a), the die matching surface 69 has an outer peripheral portion 69a and an inner peripheral portion 69b on the inner peripheral side of the outer peripheral portion 69a. The outer peripheral portion 69a has a flat surface, and the inner peripheral portion 69b is provided with an uneven portion 70. As shown in FIG.

The uneven portion 70 has a large number of ridges 71 as projections and a large number of troughs 72 as recesses, and the ridges 71 and troughs 72 are alternately arranged in the vertical direction. In this embodiment, the peaks 71 protrude from the flat surface of the outer peripheral portion 69a, and the valleys 72 are at the same height as the flat surface of the outer peripheral portion 69a. In this embodiment, the peak portion 71 has a height of 8 mm. The uneven portion 70 has a wavy shape by alternately arranging peak portions 71 and valley portions 72 . The shape of the uneven portion 70 is not limited to this, and may be sharp, rectangular, or the like.

The peaks 71 and the valleys 72 extend in the width direction of the mold matching surface 69 and are arranged parallel to each other (see FIG. 2(a)). Both ends 73 and 74 in the width direction of the mold matching surface 69 are contact surfaces that come into contact with the movable block 52, and the concave and convex portions 70 are arranged on substantially the entire inner region of these contact surfaces. there is The uneven portion 70 increases the surface area of the mold matching surface 69 .

As shown in FIG. 2( a ), the concave-convex portion 70 is formed on the steel concave-convex portion 76 formed on the mating surface 61 on the side of the base member 54 and on the mating surface 62 on the side of the copper plate 55 among the mold mating surfaces 69 . and a copper material uneven portion 77 . The mold-matching surface 69 has a wave shape that is continuous in the vertical direction due to the uneven portions 76 made of steel and the uneven portions 77 made of copper. A boundary 78 between the base member 54 and the copper plate 55 is provided at a position where a plurality of (three in this embodiment) mountain portions 71 are included in the steel uneven portion 76 . Further, as shown in FIGS. 2A and 3A, a boundary 78 is arranged at the position of the trough portion 72a of the uneven portion 70. As shown in FIG.

Next, the configuration of the movable block 52 will be described. In the following description of the movable block 52, the description of the same configuration as that of the fixed block 51 will be omitted, and the differences from the fixed block 51 will be mainly described.

The movable block 52 has a base member 81 and a copper plate 82 . The base member 81 is made of steel and has an L-shaped cross section as a whole, like the base member 54 of the fixed block 51 . The base member 81 has a pedestal portion 83 and a back plate portion 84, which are integrally formed. The configurations of the pedestal portion 83 and the back plate portion 84 are the same as those of the base member 54 of the fixed block 51 . A concave portion 86 is formed in the base member 81 similarly to the fixed block 51 .

The copper plate 82 is made of pure copper and is basically the same as the copper plate 55 of the fixed block 51 . The surface of the copper plate 82 facing the fixing block 51 side (hereinafter referred to as "mating surface 87") and the surface of the pedestal portion 83 facing the fixing block 51 side (hereinafter referred to as "mating surface 88") are The surface is continuous in the vertical direction.

The thickness D1 of the back plate portion 84 , the thickness (length D2) of the copper plate 82 , and the thickness D3 of the movable block 52 are the same as those of the fixed block 51 . The copper plate 82 is fixed to the base member 81 by screws 92 through insertion holes 89 and fixing holes 91, like the fixing block 51. As shown in FIG. Thereby, the copper plate 82 is integrated with the base member 81 .

On the surface of the movable block 52 facing the fixed block 51 side (hereinafter referred to as "mold matching surface 93"), an uneven portion 94 having a shape corresponding to the uneven portion 70 provided on the fixed block 51 is provided. . According to the shapes of the uneven portions 70 and 94, the fixed block 51 is a male block and the movable block 52 is a female block. The concave-convex portion 94 on the movable block 52 side has a large number of peak portions 95 and valley portions 96 having shapes corresponding to the valley portions 72 and peak portions 71 of the concave-convex portion 70 on the fixed block 51 side, respectively. and valleys 96 are arranged alternately in the vertical direction.

Specifically, as shown in FIG. 2(b), the mold matching surface 93 has flat surfaces at both outer edges 97 and 98 in the width direction. The mold matching surface 93 is provided with a concave portion 99 recessed on the side opposite to the fixed block 51 with respect to the flat surface of the outer edge portions 97 and 98 on the inner peripheral side of the outer edge portions 97 and 98 . The depth of the recess 99 with respect to the outer edges 97 and 98 is longer than the height of the peak 71 with respect to the outer peripheral portion 69a of the fixed block 51, and is 8.8 mm in this embodiment.

The bottom surface 79 of the recess 99 has an upper portion 79a and a lower portion 79c which are flat surfaces, and an intermediate portion 79b sandwiched between the upper portion 79a and the lower portion 79c when viewed in the vertical direction (see FIG. 2(b)). A concave-convex portion 94 is arranged in the intermediate portion 79b. In the uneven portion 94, the peak portions 95 and the valley portions 96 extend in the width direction of the mold matching surface 93 and are arranged parallel to each other. Outer edge portions 97 and 98 of the mold matching surface 93 are contact surfaces that contact the outer peripheral portion 69 a of the fixed block 51 .

The concave-convex portion 94 includes the steel concave-convex portion 31 formed on the mating surface 88 on the base member 81 side of the die-matching surface 93 and the copper concave-convex portion 32 formed on the mating surface 87 on the copper plate 82 side. ing. The mold-matching surface 93 has a corrugated shape that is continuous in the vertical direction due to the uneven portions 31 made of steel and the uneven portions 32 made of copper. The boundary 33 between the base member 81 and the copper plate 82 is arranged at the position of the trough portion 96 a of the uneven portion 94 . Therefore, as shown in FIG. 4, the boundary 78 on the side of the fixed block 51 and the boundary 33 on the side of the movable block 52 have a deviation .DELTA.L corresponding to 1/2 pitch when viewed in the vertical direction. Moreover, the copper plate 55 of the fixed block 51 and the copper plate 82 of the movable block 52 have different vertical lengths.

In this embodiment, the vertical lengths of the fixed block 51 and the movable block 52 are both equal to L1. On the other hand, the lengths of the copper plates 55 and 82 are L2 on the fixed block 51 side and L3 (>L2) on the movable block 52 side. is longer than the copper plate 55 of 1 by a deviation ΔL (see FIG. 3(b)). Note that the copper plate 55 of the fixed block 51 may be longer than the copper plate 82 of the movable block 52 . Further, the magnitude of the deviation ΔL is not limited to 1/2 pitch, but may be 3/2 pitch or longer.

As shown in FIGS. 2, 3B and 4, the movable block 52 is provided with an ejector pin 34 for ejecting the solidified molten metal in the gas vent passage 22 from the chill vent 50. As shown in FIG.

The ejector pins 34 (34a to 34d) are rod-shaped bodies made of steel, and are provided at a plurality of locations (four locations in this embodiment) on the movable block 52 (see FIG. 2(b)). Each ejector pin 34 is inserted through a through hole 35 formed in the movable block 52 . Specifically, the ejector pins 34a to 34d are arranged side by side at predetermined intervals in the vertical direction. Among the ejector pins 34a to 34d, the ejector pins 34a and 34b are respectively inserted through the through holes 35a and 35b formed in the area where the copper plate 82 is arranged. are inserted through the through holes 35c and 35d formed in the regions where the are arranged.

The through-holes 35a to 35d are formed in the movable block 52 so as to extend in the mold opening/closing direction, and pass through the movable block 52. As shown in FIG. Specifically, as shown in FIG. 4 , the through hole 35 a is formed across the back plate portion 84 of the base member 81 and the copper plate 82 . The through hole 35a is opened at the bottom surface of the valley portion 96 of the uneven portion 94, and the opening portion 36 is formed in the valley portion 96 facing the open portion. Since the through-hole 35b is the same as the through-hole 35a, the explanation thereof is omitted.

As shown in FIG. 3(b), the through-hole 35c is formed in the pedestal portion 83 of the base member 81, is open at the bottom surface of the valley portion 96, and extends into the valley portion 96 facing the open portion. is formed. Since the through hole 35d is the same as the through hole 35c, the explanation thereof is omitted. In a state in which each ejector pin 34 is inserted into each through hole 35, each ejector pin 34 can be arranged so that the opening 36 is closed by the end face 37 of the tip of each ejector pin 34 (see FIG. 4). reference). The end face 37 of the ejector pin 34 constitutes a part of the cavity 13 in the mold closed state.

Each ejector pin 34 is inserted through each through hole 35 so as to be movable in the mold opening/closing direction. Each ejector pin 34 has its base end attached to the ejector plate 26 and is movable in the same direction as the mold opening/closing direction by being driven by a driving device (not shown).

Of the through holes 35a to 35d, the through holes 35a and 35b formed in the area where the copper plate 82 is arranged have steel bushes 38 attached to their inner circumferences. 4 shows only the through hole 35a among the through holes 35. As shown in FIG. The bushing 38 has a substantially cylindrical shape and is arranged so as to surround the entire peripheral surfaces of the inner peripheral portions of the through holes 35a and 35b. Thereby, the entire inner peripheral surfaces of the through holes 35 a and 35 b are covered with the outer peripheral surface of the bush 38 . The through holes 35a and 35b correspond to the "downstream through hole", and the bush 38 corresponds to the "cylindrical body".

The gas vent passage 22 formed in the chill vent 50 has, along the gas flow direction, a straight portion 22a on the most upstream side, a wavy portion 22b in which the uneven portions 70 and 94 are formed, and a straight portion on the most downstream side. 22c, and these straight portion 22a, wavy portion 22b and straight portion 22c are continuous (see FIG. 4). The black arrows in FIG. 4 indicate the direction of gas flow. The gas discharged from the cavity 13 first passes through the straight portion 22a, then enters the corrugated portion 22b, and finally is discharged to the outside through an opening provided at the most downstream position of the straight portion 22c. The chill vent 50 is provided with uneven portions 70 and 94 on the mating surfaces of the fixed block 51 and the movable block 52 , and the uneven portions 70 and 94 increase the passage surface area of the gas vent passage 22 . As a result, when the hot molten metal from the cavity 13 enters the degassing passage 22, the uneven portions 70 and 94 promote the heat radiation of the molten metal.

Next, the operation of casting an aluminum product using the die casting apparatus 10 described above will be described with reference to FIGS. 1 and 4. FIG.

For casting, first, the die casting apparatus 10 is closed to form the cavity 13 . A chill vent 50 is attached to the die casting apparatus 10, and a gas release passage 22 is formed in the die casting apparatus 10 from the downstream side of the cavity 13 through the inside of the chill vent 50 to the outside when the mold is closed. When the molten metal is pushed out from the sleeve 16 to the sprue 15 , the molten metal is injected from the runner 17 into the cavity 13 and the gas inside the cavity 13 is discharged through the gas vent passage 22 .

The molten metal is normally filled into the cavity 13 at a high flow velocity (for example, a flow velocity of about 30 to 70 m/sec) in order to improve the shape transfer accuracy in the cavity 13 . Therefore, when the molten metal is injected into the cavity 13, it is assumed that the molten metal filled in the cavity 13 at high speed enters the gas vent passage 22 at high temperature and high speed in addition to the gas in the cavity 13. In particular, in the portions of the degassing passage 22 where the uneven portions 70 and 94 are formed, more specifically, at the inlet portions of the molten metal in the uneven portions 70 and 94 (that is, the most upstream portion of the wavy portion 22b), degassing The shape of the passage 22 changes from a straight line to a meandering shape, and the molten metal flowing at high speed collides directly and vigorously with the passage surfaces of the uneven portions 70 and 94 . Therefore, the passage surface of the gas vent passage 22 is likely to be eroded.

Here, in the chill vent 50, the inlet portions of the molten metal in the uneven portions 70, 94 provided on the mold matching surfaces 69, 93 are formed of steel, which is a high-hardness material. Therefore, the strength of the passage surface of the corrugated portion 22b is high, and it is possible to suppress the progress of melt loss of the gas vent passage 22 due to the molten metal entering the corrugated portion 22b at high temperature and high speed. A copper plate 55 made of pure copper, which is a material with high thermal conductivity, is disposed downstream of the portions of the uneven portions 70 and 94 made of steel (steel uneven portions 76 and 31). For this reason, the molten metal, whose temperature and flow velocity have been lowered to some extent by passing through the steel irregularities 76 and 31 , is rapidly cooled and solidified by subsequent contact with the copper plate 55 . This suppresses the ejection of molten metal from the degassing passage 22 to the outside. In addition, when the molten metal contacts the copper plate 55, the temperature and flow velocity of the molten metal are reduced due to the contact with the steel uneven portions 76 and 31. Cooling of the molten metal can be accelerated while suppressing loss.

When a predetermined cooling period elapses after the molten metal is injected into the cavity 13, the molten metal introduced into the cavity 13 is solidified to form a molded product. After that, the movable mold 12 is separated from the fixed mold 11, and the die casting apparatus 10 is placed in the mold open state. At this time, the molded product moves away from the fixed mold 11 while remaining attached to the movable mold 12 . After that, by moving the ejector plate 26 toward the fixed mold 11, the ejector pins 27 and 34 attached to the movable mold 12 and the movable block 52 are respectively ejected toward the molded product. As a result, the molded product is pushed out from the movable mold 12 toward the fixed mold 11 by the ejector pins 27 and 34, and the molded product (the product with runners and overflow attached) is removed from the mold.

According to the structure of this embodiment detailed above, the following excellent effects are obtained.

Steel members (base members 54, 81) made of a high-hardness material are arranged at the most upstream portion of the uneven portions 70, 94 provided in the gas vent passage 22, and relatively A member (copper plate 55) made of pure copper, which is an inexpensive high thermal conductivity material, is arranged. According to this configuration, the inlet portions of the uneven portions 70 and 94 against which the molten metal from the cavity 13 collides directly and vigorously are provided with steel members having high hardness, thereby reducing the temperature of the high-temperature molten metal. It is possible to suppress the erosion of the gas vent passage 22 while facilitating the decrease. In addition, by further arranging a member made of pure copper, which has a higher thermal conductivity than steel, on the downstream side of the inlet portions of the irregularities 70 and 94, the temperature of the steel-forming portion can be lowered to some extent and the flow velocity can be increased. The lowered molten metal can now be rapidly cooled by a pure copper member. Therefore, according to the above configuration, it is possible to provide the chill vent 50 that can suppress melting damage and has excellent cooling performance while using inexpensive materials.

A bushing 38 is arranged in the inner peripheral portion of the through hole 35 a formed across the copper plate 82 of the movable block 52 and the base member 81 . While pure copper is a relatively inexpensive material with high thermal conductivity, it has the disadvantage of not having sufficiently high mechanical strength. Therefore, there is a concern that the opening 36 of the through hole 35 a provided in the copper plate 82 on the side of the gas venting passage is likely to be eroded by the molten metal flowing through the gas venting passage 22 . Further, there is a concern that the repeated use of the ejector pin 34a accelerates the damage and deterioration of the inner peripheral surface of the through hole 35a. On the other hand, since the bushing 38 is arranged on the inner peripheral surface of the through hole 35a, even if a part of the concave-convex portion 94 is formed of pure copper, damage and deterioration of the copper-forming portion can be suppressed, resulting in durability. can ensure the integrity.

The fixed block 51 and the movable block 52 are formed so that the boundaries 78, 33 between the base members 54, 81 and the copper plates 55, 82 are positioned at the troughs 72a, 96a of the irregularities 70, 94, respectively. If the boundaries 78 and 33 are arranged on the ridges 71 and 95, the boundaries 78 and 33 are arranged in relatively fragile structural portions, which may reduce the strength of the boundary portions and reduce the durability. In this respect, according to the above configuration, even when the uneven portions 70 and 94 are formed of different materials in the flow direction of the molten metal, it is possible to suppress the decrease in the strength of the uneven portions 70 and 94 .

The fixed block 51 and the movable block 52 are configured by integrating copper plates 55 and 82 into recesses 49 and 86 of steel base members 54 and 81 . According to this configuration, one plate surface (mating surface 62, 87) of the copper plates 55, 82 is brought into contact with the molten metal, and the steel base member 54, 81 is attached to the other plate surface side of the copper plates 55, 82. can be placed. Thereby, the strength of the fixed block 51 and the movable block 52 can be sufficiently secured while the cooling of the molten metal is accelerated by the copper plates 55 and 82 .

Also, the chill vent 50 can be attached to the stationary mold 11 and the movable mold 12 by using the base members 54 and 81 (specifically, the back plate portions 57 and 84) instead of the copper plates 55 and 82. Therefore, it is possible to avoid interference between the copper plates 55 and 82 and fixtures (such as screws) during maintenance or replacement of the chill vent 50 . As a result, the product life of the chill vent 50 can be extended.

Further, when the fixed block 51 and the movable block 52 are manufactured, the copper plates 55 and 82 can be incorporated into the concave portions 49 and 86 of the base members 54 and 81, respectively. Even in the case of using the same, the structure does not become complicated, and complication of the manufacturing process can be avoided. Moreover, it is preferable in that the manufacturing cost can be reduced.

The present invention is not limited to the above embodiments, and may be implemented as follows, for example.

In the above embodiment, the fixed block 51 and the movable block 52 are formed by combining the base members 54 and 81 and the copper plates 55 and 82, respectively. , and is not limited to the configuration of the above embodiment. For example, configurations as shown in FIGS. 5(a) to 5(d) may be employed. Although only the movable block 52 is shown in FIG. 5 for convenience, the fixed block 51 is the same.

The example shown in FIG. 5A is the same as the above embodiment in that the movable block 52 includes a steel base member 81 and a copper plate 82 . However, the base member 81 of the movable block 52 shown in FIG. 5(a) has a top plate portion 85 extending from the upper end of the back plate portion 84 toward the fixed block 51 side in addition to the pedestal portion 83 and the back plate portion 84. It is different from the above embodiment in that it is further provided. In this case, a copper plate 82 is fitted in an intermediate position in the vertical direction when viewed from the fixed block 51 side, and the copper plate 82 contacts the pedestal portion 83 at its lower portion and the top plate portion 85 at its upper portion. The copper plate 82 is fixed to the base member 81 by screws or the like from the surface opposite to the mold matching surface 93 . In the movable block 52 shown in FIG. 5(a) as well, the entrance portion of the molten metal in the concave-convex portion 94 is composed of a steel base member 81, and a copper plate 82 is arranged downstream of the entrance portion. This configuration is preferable in that the amount of pure copper used can be reduced while achieving excellent mechanical strength and cooling performance, and cost reduction can be achieved.

In FIG. 5A, the base member 81 may further include side plate portions that extend from both ends of the back plate portion 84 in the width direction toward the fixed block 51 side. In this case, the base member 81 has, in the mold matching surface 93, a recessed portion whose inner peripheral portion is recessed with respect to the entire outer peripheral portion. By fitting the copper plate 82 into this concave portion, the entire outer periphery of the copper plate 82 may be surrounded by the steel base member 81 when viewed from the fixed block 51 side.

In the embodiment of FIG. 5(a), as shown in FIG. 5(b), only the boundary 33 between the base member 81 (specifically, the base portion 83) and the copper plate 82 (that is, the boundary on the downstream side in the flow direction) In addition, the boundary 39 between the top plate portion 85 of the base member 81 and the copper plate 82 (that is, the boundary on the upstream side in the flow direction) is also arranged at the position of the valley portion 96 of the uneven portion 94. A base member 81 and a copper plate 82 may be configured. According to this configuration, in the unlikely event that the copper plate 82 is eroded, the copper plate 82 can be removed from the base member 81, turned upside down, and reinserted into the base member 81, so that the copper plate 82 can be reused. can do.

In the example shown in FIG. 5(c), the movable block 52 differs from the above embodiment in that the steel base member is composed of two members. Specifically, the movable block 52 includes a steel back plate 81a, a steel pedestal 81b, and a copper plate 82, as shown in FIG. 5(c). The back plate 81a is arranged with its plate surface directed in the mold opening/closing direction. The pedestal 81b is arranged side by side on the back plate 81a while being in contact with the surface of the back plate 81a on the fixed block 51 side. The copper plate 82 is arranged with its plate surface directed in the opening and closing direction of the mold, and placed on the upper surface of the pedestal 81b with the plate surface on the side opposite to the fixing block 51 in contact with the plate surface of the back plate 81a. are placed. The pedestal 81b and the copper plate 82 are fixed to the back plate 81a with screws or the like. The movable block 52 shown in FIG. 5(c) is preferable in that it is not necessary to complicate the shape of each member, making it easy to manufacture each member.

In the example shown in FIG. 5D , the base member 81 of the movable block 52 has a pedestal portion 83 and a back plate portion 84 . In the movable block 52 of this embodiment, a protruding portion 81 c protruding toward the copper plate 82 is provided on the surface of the back plate portion 84 that is in contact with the copper plate 82 . A plurality of protrusions 81c (two in this embodiment) are provided at different positions in the vertical direction. Further, the copper plate 82 is formed with insertion holes (not shown) at positions corresponding to the projecting portions 81c on the plate surface on the back plate portion 84 side. The copper plate 82 can be fixed to the base member 81 by inserting the projecting portions 81c through these insertion holes. That is, in the movable block 52 of FIG. 5(d), the projecting portion 81c is used as a fixing pin. As a result, it is possible to obtain the chill vent 50 with a better appearance without using a fixture such as a screw when fixing the copper plate 82 to the base member 81 .

In the chill vent 50 of the above-described embodiment, of the portions where the copper plates 55 and 82 are arranged, the portions that do not constitute the gas venting passage 22, more specifically, the both ends of the fixed block 51 and the movable block 52 in the width direction are made of steel. It may be configured by a member made of Specifically, for the movable block 52, the shape of the base member 81 is designed so that the outer edges 97 and 98 of the die matching surface 93 are formed of a steel material. Further, regarding the fixed block 51, the shape of the base member 54 is designed so that the portions that contact the outer edge portions 97 and 98 are made of a steel material. In this case, the periphery of the copper plates 55 and 82 can be reinforced by a member made of steel having a higher hardness, which is preferable in that the strength of the chill vent 50 can be increased.

- The present invention may be applied to the chill vent 50 having a structure in which the chill vent 50 is provided with a cooling mechanism and the cooling mechanism further accelerates the cooling of the molten metal. As the cooling mechanism, for example, a configuration is adopted in which a fluid passage is formed inside the movable block 52 and a fluid (for example, cooling water) is circulated in the fluid passage. In this case, in addition to the copper plates 55 and 82, the cooling mechanism can further accelerate the cooling of the molten metal, which is preferable in that the injection of the molten metal can be further suppressed. A fluid passage may be formed in the copper plate 82 or may be formed in the base member 81 . When the fluid passage is formed in the copper plate 82, the effect of accelerating the cooling of the molten metal can be further enhanced.

- In the above embodiment, the boundaries 78, 33 between the base members 54, 81 and the copper plates 55, 82 are positioned at the valleys 72, 96 of the uneven portions 70, 94. However, the positions of the boundaries 78, 33 are It is not limited to this, and may be positioned on the mountain portions 71 and 95 . Alternatively, one of the boundaries 78 and 33 may be arranged in the valley portion and the other may be arranged in the peak portion. However, both of the boundaries 78 and 33 are preferably arranged in the valleys 72 and 96 in that the strength of the uneven portions 70 and 94 of the chill vent 50 can be sufficiently increased.

The size and shape of the chill vent 50 can be set according to the size and shape of the chill vent housing grooves 24 and 25 provided in the die casting apparatus 10 to which the chill vent 50 is attached. Therefore, the ratio of the length in the vertical direction to the length in the width direction, the thickness, etc. of the chill vent 50 are not limited to those shown in FIGS. 1 to 3 in the above embodiment. For example, the ratio of the vertical length to the widthwise length of the chill vent 50 may be changed to make it wider or narrower than the chill vent 50 shown in FIG.

- In the above embodiment, steel is used as the steel forming the mold and the base members 54, 81 of the chill vent 50, but other steel such as ductile cast iron may be used.

In the above embodiment, the fixed block 51 is male and the movable block 52 is female. Conversely, the fixed block 51 may be female and the movable block 52 may be male. Further, although the configuration in which the movable mold 12 is provided with the push-out mechanism 28 and the movable block 52 is provided with the push-out pin 34 and the through hole 35 has been described, the fixed mold 11 may be provided with the push-out mechanism 28 in some cases. . In that case, the fixing block 51 may be provided with the ejector pin 34 and the through hole 35 .

- In the above embodiment, the case of applying to the die casting device 10 for manufacturing aluminum products has been described, but metals other than aluminum (for example, zinc, magnesium, lead, tin, alloys thereof, etc.) are used as casting metals. You may apply this invention to a die-cast apparatus.

DESCRIPTION OF SYMBOLS 10... Die-cast apparatus (mold apparatus), 11... Fixed mold, 12... Movable mold, 13... Cavity, 22... Gas vent passage (gas passage part), 50... Chill vent, 51... Fixed block (first block), 52 Movable block (second block) 54, 81 Base member (steel forming portion) 55, 82 Copper plate (copper forming portion) 56, 83 Base portion.

Claims (5)

A mold open state in which the first block and the second block are separated from a mold closed state in which the first block and the second block are arranged side by side and combined. a chill vent operable to
The first block and the second block each have a steel-forming portion made of steel and a copper-forming portion made of pure copper,
a gas passage formed between the first block and the second block in the closed state of the mold for communicating the cavity of the mold with the outside to discharge the gas in the cavity to the outside;
A passage surface of the gas passage portion has an uneven portion in which a plurality of peak portions and valley portions are alternately arranged along the gas flow direction on the surfaces of the first block and the second block facing each other. death,
A chill vent, wherein the steel-forming portion is arranged at the most upstream portion in the flow direction of the uneven portion, and the copper-forming portion is arranged at the downstream side of the most upstream portion. The solidified material formed in one of the first block and the second block and solidified by introducing the molten metal from the cavity into the gas passage portion is placed in the one block in the open state of the mold. Equipped with an insertion hole through which an extrusion pin that pushes out from one block toward the other block is inserted,
The insertion hole is formed inside the one block so as to communicate with the gas passage portion from a side opposite to the other block,
The through hole has a downstream through hole at least part of which is arranged in the copper forming portion,
2. The chill vent according to claim 1, wherein a cylindrical body made of steel is arranged on the inner periphery of said downstream insertion hole. 3. The chill vent according to claim 1 or 2, wherein a boundary between said steel forming portion and said copper forming portion in said uneven portion is arranged at the position of said valley portion of said uneven portion. The steel-forming portion is formed by a base member made of block-shaped steel having a concave portion that is recessed on the side opposite to the side where the first block and the second block face each other, in the downstream portion of the facing surface in the flow direction. is formed and
The copper forming portion is formed of a copper plate having the same thickness as the depth of the recess,
Each of the first block and the second block is formed by placing the copper plate in the recess and integrating the base member and the copper plate. chill vent described in section. A chill vent according to any one of claims 1 to 4;
a mold in which the cavity is formed in the mold closed state,
A mold apparatus, wherein the chill vent is positioned downstream of the cavity.

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