JP7424935B2 - Mold and manufacturing method - Google Patents

Description

The present invention relates to a mold and a manufacturing method.

In some disc brakes, a mounting member for supporting a brake pad and a caliper body are manufactured by casting (for example, see Patent Document 1).

JP2020-8131A

By the way, it is desired to suppress deterioration in casting quality.

An object of the present invention is to provide a mold and a manufacturing method that can suppress deterioration in casting quality.

In order to achieve the above object, a first aspect of the present invention is a mold having a first part and a second part located below the first part in the direction of gravity, the mold having a sprue. an upper runner portion having a concave portion on the upper inner surface of the first portion forming a downstream end of the runner opposite to the upstream side where the sprue is provided, and the end of the runner; a lower runner part provided in the second part, a riser part connected to the lower runner part and having a pool of hot water, and a riser part connected to the riser part; A main body portion that shapes an object obtained by casting.

A second aspect of the present invention includes a first portion and a second portion located below the first portion in the direction of gravity, and is connected to a sprue, and the sprue of the runner is provided with the second portion. an upper runner having a concave portion on the upper inner surface of the first portion forming a downstream end opposite to the upstream side where the runner is connected; a lower runner part provided in the second part; a riser part connected to the lower runner part and having a pool; a main body part connected to the riser part to form an object obtained by casting; and a second step of performing casting using the mold prepared in the first step to obtain the object.

According to the present invention, deterioration in casting quality can be suppressed.

FIG. 1 is a side sectional view showing a mold according to an embodiment. FIG. 2 is a perspective view of the mold according to the embodiment, with the main body portion omitted. FIG. 2 is a side sectional view of the mold according to the embodiment, with the main body portion omitted. FIG. 7 is a perspective view of a mold according to a modification of the embodiment, with the main body portion omitted.

Embodiments will be described below with reference to the drawings.

As shown in FIGS. 1 to 3, the mold 11 of the embodiment includes an upper mold 21 (first part) and a lower mold 22 (second part) located below the upper mold 21 in the direction of gravity. This is a horizontally split mold. The mold 11 is constructed by overlapping an upper mold 21 and a lower mold 22. As shown in FIG. 1, the mold 11 has a runner 32 connected to the sprue 31, a riser section 33 connected to the end of the runner 32 on the opposite side from the sprue 31, and a riser section 33 connected to the riser section 33. The main body portions 34 and 35 are provided.

The upper mold 21 has a planar first mold dividing surface 41 as its lower surface. The first mold dividing surface 41 of the upper mold 21 extends horizontally. The lower mold 22 has a planar second mold dividing surface 42 as its upper surface. The second type dividing surface 42 extends horizontally. When the upper mold 21 and the lower mold 22 are clamped, the first mold dividing surface 41 of the upper mold 21 and the second mold dividing surface 42 of the lower mold 22 are positioned in the horizontal direction and overlap in surface contact.

The runner 32 has an upper runner 51 and a lower runner 52 at the end opposite to the sprue 31 . The upper runner 51 is disposed closer to the sprue 31 than the lower runner 52 in the runner 32 and is connected to the sprue 31 . The upper runner part 51 has an upper runner forming part 61 formed in the upper mold 21 so as to be recessed upward from the first mold dividing surface 41 . The upper runner forming part 61 has a lower opening 62 that opens downward at the position of the first mold dividing surface 41 . The lower opening 62 has an upstream lower opening 63 on the sprue 31 side and a downstream lower opening 64 on the opposite side to the sprue 31 . An upstream lower opening 63 of the lower opening 62 is closed by the second mold dividing surface 42 of the lower mold 22 . The downstream lower opening 64 is not closed by the second mold dividing surface 42 of the lower mold 22 . The upper runner section 51 is formed of an upper runner forming section 61 and a lower opening closing section 67 that closes the upstream lower opening section 63 of the second mold dividing surface 42 of the lower mold 22 .

The upper runner forming part 61 has a pair of first inner wall surfaces 71 (only one of which is shown in FIG. 1 due to the cross section) that extends upward from the first mold dividing surface 41 and faces each other, and An upper inner surface 72 that connects the edge portions of the wall surface 71 on the side opposite to the first mold dividing surface 41, that is, the upper side, and a side that connects the pair of first inner wall surfaces 71 and the upper inner surface 72 on the side opposite to the sprue 31. It has a part inner surface 73.

The pair of first inner wall surfaces 71 are inclined so that they approach each other closer to the upper inner surface 72 side. The pair of first inner wall surfaces 71 have end edges opposite to the upper inner surface 72 arranged on the first mold dividing surface 41 . The pair of first inner wall surfaces 71 and upper inner surface 72 extend linearly in the same direction (left-right direction in FIG. 1) along the first mold dividing surface 41, and these extending directions are used to form the upper runner. This is the direction in which the portion 61 extends. The extending direction of the upper runner forming part 61 is also the extending direction of the upper runner 51 and the longitudinal direction of the upper runner 51. The side inner surface 73 is arranged at the end of the upper runner forming part 61 on the opposite side from the sprue 31 in the extending direction of the upper runner forming part 61 .

The upper inner surface 72 has a planar main body part 81 parallel to the first mold dividing surface 41 , and a side opposite to the sprue 31 of the main body part 81 in the opposite direction to the first mold dividing surface 41 , that is, above the main body part 81 . It has a recessed part 82 recessed in the. The recessed portion 82 includes an upstream curved portion 85 on the sprue 31 side in the extending direction of the upper runner forming portion 61 and a downstream curved portion 86 on the side opposite to the sprue 31 in the extending direction of the upper runner forming portion 61. , and an intermediate curved portion 87 between them.

The upstream curved portion 85 is formed continuously with the main body portion 81 on the opposite side of the main body portion 81 from the sprue 31 . The upstream curved portion 85 is an axis that connects the pair of first inner wall surfaces 71 and is parallel to the first mold dividing surface 41, and is located in the extending direction of the upper runner forming portion 61 with respect to the upstream curved portion 85. It has the shape of a part of a cylindrical surface centered on the axis located on the sprue 31 side and above. The upstream curved portion 85 has the shape of a portion of this cylindrical surface on the side opposite to and below the sprue 31 in the extending direction of the upper runner forming portion 61 with respect to the central axis thereof.

The intermediate curved portion 87 is formed continuously with the upstream curved portion 85 on the opposite side of the main body portion 81 of the upstream curved portion 85 . The intermediate curved portion 87 is a cylindrical surface whose center is an axis that connects the pair of first inner wall surfaces 71 and is parallel to the first mold dividing surface 41 and is located below the intermediate curved portion 87. It has the shape of a part of. The intermediate curved portion 87 has a shape above the central axis of this cylindrical surface. The radius of curvature of the intermediate curved portion 87 is smaller than the radius of curvature of the upstream curved portion 85.

The downstream curved portion 86 is formed continuously with the intermediate curved portion 87 on the opposite side of the intermediate curved portion 87 from the upstream curved portion 85 . The downstream curved portion 86 is an axis that connects the pair of first inner wall surfaces 71 and is parallel to the first mold dividing surface 41, and is located in the extending direction of the upper runner forming portion 61 with respect to the downstream curved portion 86. It has the shape of a part of a cylindrical surface centered on the axis located on the side and lower side of the sprue 31. The downstream curved portion 86 has the shape of a portion of this cylindrical surface on the side opposite to and above the sprue 31 in the extending direction of the upper runner forming portion 61 with respect to the central axis thereof. The radius of curvature of the downstream curved portion 86 is larger than the radius of curvature of the intermediate curved portion 87 and the upstream curved portion 85.

The side inner surface 73 includes an arcuate portion 91 formed continuously with the downstream curved portion 86 on the opposite side of the intermediate curved portion 87 of the downstream curved portion 86 of the recess 82 , and a downstream curved portion of the arcuate portion 91 . It has an end forming part 92 formed continuously with a circular arc-shaped part 91 on the opposite side from the part 86. The arc-shaped portion 91 is an axis that connects the pair of first inner wall surfaces 71 and is parallel to the first mold dividing surface 41, and is connected to the sprue 31 in the extending direction of the upper runner forming portion 61 with respect to the arc-shaped portion 91. It has the shape of a part of a cylindrical surface centered on an axis located on the side and bottom side. The arc-shaped portion 91 has the shape of a part of the cylindrical surface on the side opposite to and above the sprue 31 in the extending direction of the upper runner forming portion 61 with respect to the central axis thereof. The radius of curvature of the arc-shaped portion 91 is smaller than the radius of curvature of the downstream curved portion 86 and larger than the radius of curvature of the intermediate curved portion 87 and the upstream curved portion 85. The radius of curvature of the arcuate portion 91 is larger than the minimum radius of curvature of the recess 82 .

The end forming part 92 is an axis that connects the pair of first inner wall surfaces 71 and is parallel to the first mold dividing surface 41, and is connected to the sprue 31 in the extending direction of the upper runner forming part 61 with respect to the end forming part 92. It has the shape of a part of a cylindrical surface centered on an axis located on the side and bottom side. The end forming part 92 has the shape of a part of this cylindrical surface on the side opposite to and above the sprue 31 in the extending direction of the upper runner forming part 61 with respect to the central axis thereof. The radius of curvature of the end forming portion 92 is larger than the radius of curvature of the arc-shaped portion 91. Therefore, the end forming portion 92 has a shape that is closer to a flat surface than the arc-shaped portion 91. The edge portion of the end forming portion 92 on the opposite side from the arcuate portion 91 is disposed on the first mold dividing surface 41 . The downstream curved portion 86 and the side inner surface 73 are inclined so that the lower the side is on the first mold dividing surface 41 side, that is, the lower side is located on the opposite side to the sprue 31 in the extending direction of the upper runner forming portion 61. .

The upper runner 51 has an upstream runner 95 between the pair of first inner wall surfaces 71 , the main body portion 81 of the upper inner surface 72 , and the lower opening 62 . The cross-sectional area of the upstream runner 95 in a plane perpendicular to the extending direction of the upper runner 51 is constant regardless of the position in the extending direction of the upper runner 51.

The upper runner 51 has a downstream runner 96 between the pair of first inner wall surfaces 71, the recess 82 of the upper inner surface 72, the side inner surface 73, and the lower opening 62. The cross-sectional area of the downstream runner 96 in a plane perpendicular to the extending direction of the upper runner 51 changes depending on the position in the extending direction of the upper runner 51. The cross-sectional area of the downstream runner 96 becomes larger than the cross-sectional area of the upstream runner 95 as it moves away from the upstream runner 95, and then becomes smaller. will also become smaller. The downstream runner 96 has a maximum cross-sectional area on a plane passing through the upper end position of the intermediate curved portion 87 of the recess 82 .

As described above, the upper runner 51 has a recess 82 in the upper inner surface 72 of the upper mold 21 that connects to the sprue 31 and forms the end of the runner 32. The upper runner 51 includes an arcuate portion 91 that is formed at the end of the runner 32 on the side inner surface 73 of the upper die 21 in the longitudinal direction of the runner 32 and is continuous with the recess 82 . The upper runner section 51 has a cross-sectional area at the end of the runner 32 in the longitudinal direction of the runner 32, compared to the cross-sectional area of the upstream runner section 95 located before the end of the runner 32 in the longitudinal direction of the runner 32. A downstream runner section 96 is provided, which is a section having a large cross-sectional area.

The lower runner portion 52 has a lower runner forming portion 101 formed in the lower mold 22 by being recessed downward from the second mold dividing surface 42 . The lower runner forming part 101 has an upper opening 102 that opens upward at the position of the second mold dividing surface 42 . The upper opening 102 has an upstream upper opening 103 on the sprue 31 side in the extending direction of the upper runner 51, and a downstream upper opening 104 on the opposite side from the sprue 31. A downstream upper opening 104 of the upper opening 102 is closed by the first mold dividing surface 41 of the upper mold 21 . The upper upstream opening 103 faces and communicates with the lower downstream opening 64 of the upper die 21 . The lower runner section 52 is formed of a lower runner forming section 101 and an upper opening closing section 107 that closes the downstream upper opening section 104 of the first mold dividing surface 41 of the upper mold 21 .

The lower runner forming part 101 has a pair of second inner wall surfaces 111 (only one of which is shown in FIG. 1 due to the cross section) that extends downward from the second mold dividing surface 42 and faces each other; The main inner surface 112 that connects the end edges on the sprue 31 side in the extending direction of the upper runner 51 of the wall surface 111 and the sprue 31 in the extending direction of the upper runner 51 of the pair of second inner wall surfaces 111 are It has a lower inner surface 113 that connects the opposite end edges to each other on the side opposite to the second mold dividing surface 42 than the main body inner surface 112, that is, on the lower side.

The pair of second inner wall surfaces 111 are inclined so that they approach each other toward the bottom. The upper end edges of the pair of second inner wall surfaces 111 are arranged on the second mold dividing surface 42 . The upper edge of one second inner wall surface 111 of the lower runner forming part 101 connects the lower edge of one of the first inner wall surfaces 71 of the upper runner forming part 61 and the pair of second inner wall surfaces 111. The positions in the direction along the second mold dividing surface 42 are matched. The upper edge of the other second inner wall surface 111 of the lower runner forming part 101 connects the lower edge of the other first inner wall surface 71 of the upper runner forming part 61 and the pair of second inner wall surfaces 111. The positions in the direction along the second mold dividing surface 42 are matched.

The main inner surface 112 has a planar shape that connects the pair of second inner wall surfaces 111 and is parallel to an axis that is parallel to the second mold dividing surface 42, and the lower the main body surface 112 is, the more the main body inner surface 112 is connected to the sprue 31 in the extending direction of the upper runner section 51. It is slanted to be located on the opposite side. The upper edge of the inner surface of the main body 112 is disposed on the second mold dividing surface 42 . The lower inner surface 113 is formed continuously from the main inner surface 112. The lower inner surface 113 is an axis that connects the pair of second inner wall surfaces 111 and is parallel to the second mold dividing surface 42, and is opposite to the sprue 31 in the extending direction of the upper runner section 51 with respect to the lower inner surface 113. It has the shape of a part of a cylindrical surface centered on the axis located on the side and upper side. The lower inner surface 113 has a shape of a part of this cylindrical surface on the sprue 31 side and lower side in the extending direction of the upper runner section 51 with respect to the central axis thereof.

The lower runner section 52 has an end opposite to the upper runner section 51 connected to the riser section 33 . The cross-sectional area of the lower runner section 52 in a plane perpendicular to the extending direction of the upper runner section 51 increases toward the riser section 33 side.

As described above, the lower runner 52 is connected to the upper runner 51 at the end of the runner 32 and is provided in the lower mold 22 . The lower runner portion 52 is configured such that the cross-sectional area of the runner 32 increases toward the riser portion 33.

The riser section 33 has a riser body section 121 and a pool 122. The riser main body portion 121 is formed away from the upper runner forming portion 61 on the opposite side of the sprue 31 in the extending direction of the upper runner forming portion 61 . The riser main body 121 is formed in the upper mold 21 so as to be recessed upward from the first mold dividing surface 41 . The riser main body 121 has a lower opening 131 that opens downward at the position of the first mold dividing surface 41 .

The riser main body portion 121 has a planar shape along the extending direction of the upper runner portion 51, and extends upward from the first mold dividing surface 41. ), a side wall surface 133 connecting the edges of the pair of inner wall surfaces 132 on the sprue 31 side in the extending direction of the upper runner section 51 , and an upper runner section 51 of the pair of inner wall surfaces 132 . A side wall surface 134 that connects the end edges on the opposite side to the sprue 31 in the extending direction of and a ceiling surface 135 connecting the end edges of. The ceiling surface 135 has a planar shape parallel to the first mold dividing surface 41 .

The pair of inner wall surfaces 132 are inclined so that they approach each other closer to the ceiling surface 135, that is, toward the upper side. The side wall surface 133 and the side wall surface 134 are inclined so that they approach each other closer to the ceiling surface 135 side. A communication opening 138 that communicates with the main body portion 34 is formed in each of the pair of inner wall surfaces 132 .

The tundish pool 122 is formed continuously with the lower runner forming part 101 on the opposite side of the lower runner forming part 101 from the sprue 31 in the extending direction of the upper runner forming part 51 . The hot water pool 122 is formed in the lower mold 22 so as to be recessed downward from the second mold dividing surface 42 . The hot water pool 122 has an upper opening 161 that opens upward at the position of the second mold dividing surface 42 . The upper opening 161 faces the lower opening 131 of the riser body 121 and communicates with the lower opening 131 . The upper opening 161 and the lower opening 131 have the same shape and are arranged to coincide with each other in the horizontal direction.

The molten water pools 122 form a pair of planar shapes extending in the extending direction of the upper runner 51 and extend downward from the second mold dividing surface 42, and are opposed to each other (only one is shown in FIG. 1 due to the cross-sectional view). , a side wall surface 163 connecting the edges of the pair of inner wall surfaces 162 on the sprue 31 side in the extending direction of the upper runner section 51 , and an extension of the upper runner section 51 of the pair of inner wall surfaces 162 . A side wall surface 164 that connects the edges on the opposite side to the sprue 31 in the current direction, and an end on the opposite side to the second mold dividing surface 42 of the pair of inner wall surfaces 162, side wall surface 163, and side wall surface 164, that is, on the lower side. It has a bottom surface 165 that connects the edges. The bottom surface 165 has a planar shape parallel to the second mold dividing surface 42 .

The pair of inner wall surfaces 162 are inclined so that they approach each other closer to the bottom surface 165 side, that is, toward the bottom. The side wall surface 163 and the side wall surface 164 are inclined so that they approach each other closer to the bottom surface 165 side. A communication opening 168 that communicates with the main body portion 35 is formed in each of the pair of inner wall surfaces 162 . A side opening 169 that opens into the lower runner 52 is formed in the side wall surface 163 at a central position between the pair of inner wall surfaces 162 .

As described above, the riser section 33 is connected to the lower runner section 52 and has the tundish pool 122.

The main body portion 34 is connected to each communication opening 138 of the pair of inner wall surfaces 132 of the riser main body portion 121 . Therefore, a pair of main body parts 34 are provided for one feeder main body part 121 (only one is shown in FIG. 1 due to the cross-sectional view). The main body portion 34 forms a caliper body C as an object obtained by casting. The caliper body C is a cast product used in a disc brake, and is a component of a fist-type caliper. The main body part 34 includes a cylinder part forming part 181 that forms a cylinder part Ca in which the piston of the caliper body C is accommodated, and a claw part forming part 182 that forms a claw part Cb that faces the cylinder part Ca of the caliper body C. It has a bridge part forming part 183 that forms a bridge part Cc that connects the cylinder part Ca and the claw part Cb of the caliper body C.

The main body portion 35 is connected to communication openings 168 in each of the pair of inner wall surfaces 162 of the hot water pool 122 . Therefore, a pair of main body parts 35 (only one is shown in FIG. 1 due to the cross-sectional view) is provided for one hot water pool 122. The main body portion 35 forms a caliper body C as an object obtained by casting. The main body part 35 has the same shape as the main body part 34 but is upside down, and has a cylinder part forming part 181, a claw part forming part 182, and a bridge part forming part 183 similar to the main part 34.

As described above, the main body parts 34 and 35 are connected to the riser part 33 and form the caliper body C as an object obtained by casting. The body portions 34, 35 may also form other castings, such as mounting members used in disc brakes to support brake pads, for example. In that case, the main body parts 34, 35 are formed in a shape that matches the casting to be formed.

Next, a method for manufacturing a cast product using the mold 11 described above will be explained. This manufacturing method is specifically a method for manufacturing a caliper body C used for a disc brake.

This manufacturing method includes a first step of preparing the mold 11 described above, and a second step of performing casting using the mold 11 prepared in the first step to obtain a caliper body C as an object. . Here, the caliper body C is specifically made of cast iron, so molten iron is poured into the mold 11. It is also applicable to other metals such as aluminum other than iron.

In the second step, first, the upper mold 21 and the lower mold 22 are clamped with the upper mold 21 and the lower mold 22 aligned in the horizontal direction. Then, the runner 32 consisting of the upper runner 51 and the lower runner 52, the riser 33, and the main body parts 34, 35 are formed in the mold 11 so as to be continuous. In this state, molten metal is injected from the sprue 31. Then, the injected molten metal flows inside the upper runner 51 toward the lower runner 52, passes through the lower runner 52, flows to the riser 33, and then fills the main body parts 34, 35. Ru.

At this time, the molten metal flowing inside the upper runner 51 toward the lower runner 52 flows from the upstream runner 95 to the lower runner 52 through the downstream runner 96. However, the flow at the tip of the molten metal in the upper runner 51 is as shown by arrows X1 and X2 in FIG. 3. That is, the upper partial flow X1 of the molten metal tip in the upper runner 51 is caused by the concave portion 82 and the arc-shaped portion 91 being formed at the end of the upper runner 51. , flows in the direction along the arc-shaped portion 91 into the recess 82 , flows within the recess 82 toward the upstream curved portion 85 along the downstream curved portion 86 , and flows into the upstream curved portion 85 . and flows toward the downstream lower opening 64 of the upper runner 51 and the upstream upper opening 103 of the lower runner 52, that is, downward. As a result, the mainstream portion X2 of the tip of the molten metal in the upper runner portion 51 from the vertically intermediate portion to the lower portion is changed from a state in which it attempts to proceed along the extending direction of the upper runner portion 51 due to inertia force to a downstream state. It is guided in the direction of the lower side opening 64 and the upper upstream opening 103, that is, downward. As a result, the entire tip of the molten metal is rectified and smoothly enters the lower runner part 52, and even in the lower runner part 52, where the cross-sectional area where it is easy to spread and become splashes is expanded, it is suppressed from spreading and turning into droplets. be done. Thereby, the tip of the molten metal flowing as the partial flow X1 and the main flow X2 can be suppressed from spreading and becoming splashes. Therefore, the contact area of the tip of the molten metal with the air can be reduced, and a drop in the temperature of the tip can be suppressed, as well as the entrainment of air into the tip.

Patent Document 1 describes that in a disc brake, a mounting member for supporting a brake pad and a caliper body are manufactured by casting. In casting, a method of producing cast products using a mold, especially when the tip of the molten metal spreads inside the mold and becomes droplets, the contact area with the air increases, making it more likely to oxidize and entrain air, resulting in the formation of cavities and pins. This leads to deterioration in casting quality of holes, etc.

On the other hand, in the mold 11 and the manufacturing method of the embodiment, the mold 11 has an upper runner section 51 having a recess 82 on the upper inner surface 72 of the upper mold 21 that connects with the sprue 31 and forms the end of the runner 32. , a lower runner 52 connected to the upper runner 51 at the end of the runner 32 and provided in the lower mold 22; and a riser 33 connected to the lower runner 52 and having a hot water pool 122. , and main body parts 34 and 35 connected to the riser part 33 and forming the object obtained by casting. As described above, since the recess 82 is formed in the upper inner surface 72 of the upper runner 51, the upper partial flow X1 of the tip of the molten metal in the upper runner 51 flows through the recess 82 into the upper runner 51. It flows toward the downstream lower opening 64 of the lower runner 52 and the upstream upper opening 103 of the lower runner 52, thereby guiding the mainstream portion X2 to flow in the same manner. Thereby, it is possible to suppress the diffusion and splashing of the tip of the molten metal. Therefore, it is possible to suppress a drop in the temperature of the hot water tip, and to suppress the entrainment of air into the hot water tip, so that it is possible to suppress the occurrence of cavities, pinholes, etc. Furthermore, since the contact area of the tip with air can be reduced, oxidation of the tip can be suppressed, and dross defects due to oxides can be suppressed. In addition, it is also possible to suppress defects caused by inclusions, such as when the mold 11 is locally hit by hot water and a part of the mold 11 is peeled off and flows into the product section. Therefore, deterioration in casting quality can be suppressed.

Further, in the mold 11 and the manufacturing method of the embodiment, the upper runner 51 of the mold 11 is formed in the recess 82 at the end of the runner 32 on the side inner surface 73 of the upper mold 21 in the longitudinal direction of the runner 32. It includes an arc-shaped portion 91 that is continuously formed. Therefore, the upper partial flow X1 of the molten metal tip in the upper runner 51 flows through the side inner surface 73 and the recess 82 to the downstream lower opening 64 of the upper runner 51 and upstream of the lower runner 52. It flows even more smoothly toward the upper side opening 103 and guides the main flow portion X2 to flow in the same way. Thereby, it is possible to further suppress the diffusion and splashing of the tip of the molten metal. Therefore, deterioration in casting quality can be further suppressed.

Further, in the mold 11 and the manufacturing method of the embodiment, the upper runner section 51 has a cross-sectional area of the runner runner 32 compared to the cross-sectional area of the upstream runner section 95 in front of the end of the runner in the longitudinal direction of the runner 32. The downstream runner 96 has a large cross-sectional area at the end of the runner 32 in the longitudinal direction of the runner 32 . Therefore, the upper partial flow X1 of the molten metal tip in the upper runner 51 flows through the recess 82 and the downstream runner 96 into the downstream lower opening 64 of the upper runner 51 and the lower runner 52. The fluid flows further smoothly toward the upper opening 103 on the upstream side, and guides the mainstream portion X2 to flow in the same manner. Thereby, it is possible to further suppress the diffusion and splashing of the tip of the molten metal. Therefore, deterioration in casting quality can be further suppressed.

Further, in the mold 11 and the manufacturing method of the embodiment, the lower runner 52 is configured such that the cross-sectional area of the runner 32 increases toward the molten pool 122. The lower runner 52 having such a shape is highly effective in suppressing the diffusion and splashing of the tip of the molten metal, since the tip of the molten metal tends to spread and become splashes.

Moreover, since the mold 11 and the manufacturing method of the embodiment are cast products used for disc brakes, which have strict quality control, the yield can be improved.

In addition, although the above description has been made by taking as an example a horizontally split mold in which the mold 11 has an upper mold 21 as a first part and a lower mold 22 as a second part, the mold 11 has a runner 32 and a runner similar to the mold 11. It is also possible to form the riser portion 33 and the like using a vertically split mold 11A that is composed of a right mold 201 and a left mold 202, as shown in FIG. The mold 11A is composed of a right mold 201 on the right side and a left mold 202 on the left side when viewed from the downstream side in the flow direction of the molten metal in the extending direction of the upper runner section 51. The mold dividing surface 203 of the right mold 201 and the mold dividing surface 204 of the left mold form a planar shape extending in the vertical direction. The right half of the runner 32 and the riser section 33 when viewed from the downstream side is formed in the right mold 201, and the left half of the runner 32 and the riser section 33 when viewed from the downstream side is formed on the left mold 202. is formed. In this case, the first part corresponding to the upper mold 21 is composed of an upper part 211 above the upper opening closing part 107 of the right mold 201, an upper part 212 above the upper opening closing part 107 of the left mold 202, and a lower part 212 above the upper opening closing part 107 of the left mold 202. The second portion corresponding to the mold 22 includes a lower part 213 below the lower opening closing part 67 of the right mold 201 and a lower part 214 below the lower opening closing part 67 of the left mold 202.

The mold of the first aspect of the embodiment described above is
A mold having a first part (for example, the upper mold 21 or the upper parts 211, 212) and a second part (for example, the lower mold 22 or the lower parts 213, 214) located below the first part in the direction of gravity. For example, mold 11 or mold 11A),
an upper runner portion having a recess (e.g., recess 82) on the upper inner surface (e.g., upper inner surface 72) of the first portion that connects to a sprue (e.g., sprue 31) and forms an end of the runner (e.g., runner 32); (for example, the upper runner section 51),
a lower runner part (for example, lower runner part 52) connected to the upper runner part at an end of the runner and provided in the second part;
A riser part (e.g., riser part 33) connected to the lower runner part and having a tundish (e.g. tundish 122); For example, it is a mold comprising main body parts 34, 35).
Thereby, deterioration in casting quality can be suppressed.

The mold of the second aspect is the mold of the first aspect,
The upper runner section has an arcuate shape that is formed at an end of the runner, on a side inner surface (for example, a side inner surface 73) of the first part in the longitudinal direction of the runner, and that is continuous with the recess. (for example, an arcuate portion 91).

The mold of the third aspect is the mold of the second aspect, wherein the upper runner has a cross-sectional area in front of the end of the runner (for example, the upstream runner 95) in the longitudinal direction. In comparison, this mold includes a portion (for example, the downstream runner section 96) having a large cross-sectional area at the end of the runner in the longitudinal direction.

The mold of the fourth aspect is the mold of the first aspect,
The lower runner section is a mold configured such that the cross-sectional area of the runner increases toward the pool.

The mold of the fifth aspect is the mold of the first aspect, comprising:
The object is a mold that is a cast product (for example, a caliper body C) used for a disc brake.

The mold of the sixth aspect is the mold of the first aspect,
The first part is an upper mold (eg, upper mold 21), and the second part is a lower mold (eg, lower mold 22), which is a horizontally split mold.

The mold of the seventh aspect is the mold of the first aspect,
The first part is composed of the upper part (for example, upper part 211) of the right mold (for example, right mold 201) and the upper part (for example, upper part 212) of the left mold (for example, left mold 202), and the second part is composed of the upper part (for example, upper part 212) of the right mold (for example, left mold 202). It is a vertically split mold consisting of a lower part (for example, lower part 213) and a lower part of the left mold (for example, lower part 214).

The manufacturing method of the eighth aspect includes:
A mold having a first part (for example, the upper mold 21 or the upper parts 211, 212) and a second part (for example, the lower mold 22 or the lower parts 213, 214) located below the first part in the direction of gravity. For example, mold 11 or mold 11A),
an upper runner portion having a recess (e.g., recess 82) on the upper inner surface (e.g., upper inner surface 72) of the first portion that connects to a sprue (e.g., sprue 31) and forms an end of the runner (e.g., runner 32); (for example, the upper runner section 51),
a lower runner part (for example, lower runner part 52) connected to the upper runner part at an end of the runner and provided in the second part;
A riser part (e.g., riser part 33) connected to the lower runner part and having a tundish (e.g. tundish 122); For example, a first step of preparing a mold, comprising a main body portion 34, 35);
a second step of performing casting using the mold prepared in the first step to obtain the object;
This is a manufacturing method including.
Thereby, deterioration in casting quality can be suppressed.

11,11A Mold 21 Upper mold (first part)
22 Lower mold (second part)
31 Sprue sprue 32 Runner 33 Raiser section 34, 35 Main body section 51 Upper runner section 52 Lower runner section 72 Upper inner surface 73 Side inner surface 82 Recessed section 91 Arc-shaped section 95 Upstream runner section 96 Downstream runner section ( (parts with large cross-sectional area)
122 Hot water pool 211,212 Upper part (first part)
213,214 Lower part (second part)
C Caliper body (object, cast product)

Claims (8)

A mold having a first part and a second part located below the first part in the direction of gravity,
an upper runner having a concave portion on the upper inner surface of the first portion, which connects to the sprue and forms a downstream end of the runner opposite to the upstream side where the sprue is provided;
a lower runner part connected to the upper runner part at the end of the runner and provided in the second part;
a riser part connected to the lower runner part and having a pool of hot water;
a main body connected to the riser and forming an object obtained by casting;
A mold comprising: The mold according to claim 1,
The upper runner includes, at the end of the runner, an arc-shaped portion that is continuous with the recess and is formed on a side inner surface of the first portion in the longitudinal direction of the runner.
template. The mold according to claim 2,
The upper runner includes a portion where the cross-sectional area of the end of the runner in the longitudinal direction is larger than the cross-sectional area of the end of the runner in the longitudinal direction.
template. The mold according to claim 1,
The lower runner section is configured such that the cross-sectional area of the runner increases toward the tundish pool.
template. The mold according to claim 1,
The object is a cast product used for disc brakes,
template. The mold according to claim 1,
A horizontally split mold, wherein the first part is an upper mold, and the second part is a lower mold. The mold according to claim 1,
The first section is composed of an upper part of the right mold and an upper part of the left mold, and the second part is composed of a lower part of the right mold and a lower part of the left mold. having a first part and a second part located below the first part in the direction of gravity,
an upper runner having a concave portion on the upper inner surface of the first portion, which connects to the sprue and forms a downstream end of the runner opposite to the upstream side where the sprue is provided;
a lower runner part connected to the upper runner part at the end of the runner and provided in the second part;
a riser part connected to the lower runner part and having a pool of hot water;
a main body connected to the riser and forming an object obtained by casting;
A first step of preparing a mold comprising;
a second step of performing casting using the mold prepared in the first step to obtain the object;
manufacturing methods including.

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