JP5059334B2 - Molding equipment - Google Patents

Description

  The present invention relates to a mold apparatus including a pair of molds in which a gate is provided on a sliding surface and the mold is closed and opened by sliding on the sliding surface.

As an example of the mold apparatus, a portion provided on a pair of horizontal mold dividing surfaces (parting surfaces), connecting a gate and a weir forming space connected to the cavity in a closed state, and extending substantially parallel to the sliding surface 2. Description of the Related Art A mold apparatus provided with a runner forming space having a known shape is known (for example, see Patent Document 1).
JP-A-8-243721

  In such a mold apparatus in which a runner formation space is provided on a pair of horizontal split surfaces, when the melt flows into the runner formation space, the melt tends to enter between the split surfaces. The molten metal that has entered between the divided surfaces reaches the sliding surface on which the pair of horizontal molds slide, and may leak between the pair of horizontal molds and the sliding surface that are closed. In addition, the molten metal may leak from the gate to the pair of horizontal molds closed and the sliding surface. When the leaked molten metal is solidified, in the worst case, the horizontal mold cannot be slid and the mold cannot be closed or opened. Further, when the molten metal reaches the cavity along the dividing surface from the runner formation space and solidifies as it is, a casting burr is formed in the product portion, which becomes a problem.

  In view of the above circumstances, the present invention has been devised to prevent the molten metal from leaking between the pair of molds closed with the mold and the sliding surface, or reaching the cavity from the runner formation space. An object of the present invention is to provide a mold apparatus.

The first mold apparatus of the present invention that solves the above-described object includes a pair of molds in which a gate is provided on a sliding surface, and mold closing and mold opening are performed by sliding on the sliding surface. In mold equipment,
A runner forming space provided on the split surfaces of the pair of molds, connecting the gate and the weir forming space connected to the cavity in a closed state, and having a portion extending substantially parallel to the sliding surface;
A rib forming space having a thickness that is thinner than the thickness of the runner forming space that extends along the split surface from the runner forming space toward the sliding surface;
And a bulging portion molding space bulging at the tip of the rib molding space.

  According to the first mold apparatus of the present invention, utilizing the fact that the molten metal tends to enter between the divided surfaces, the rib forming space is provided along the divided surface, and the molten metal is supplied to the rib forming space. Actively guide the molten metal into the bulge forming space. When the molten metal that has passed through the rib forming space enters the bulging portion forming space, the space suddenly expands and enters a negative pressure state, so that the molten metal stays and stays in the bulging portion forming space. During this time, the pair of molds take heat and solidify. Therefore, the molten metal does not enter the split surface until it exceeds the bulging portion forming space, and the molten metal is prevented from leaking between the pair of molds closed with the mold and the sliding surface. In addition, if the molten metal in the runner formation space solidifies faster than the molten metal in the cavity, the molten metal in the vicinity of the portion where the weir is connected in the cavity is solidified and contracted through the weir. The molten metal in the runner formation space cannot be replenished. For this reason, a contrivance is made to solidify the molten metal in the runner forming space later than the molten metal in the cavity. When such a contrivance is made, when the molten metal in the cavity is solidified, the mold is opened and the cast product is removed, and the molten metal in the runner formation space is still semi-solidified, A part of the runway that has been torn off in the middle may block the gate. However, in the mold apparatus of the present invention, due to the difference in the thickness of the space, the molten metal in the rib forming space and the molten metal in the bulging portion forming space solidify faster than the molten metal in the runner forming space, and semi-solidified. Is reinforced by the molten metal solidified in the rib forming space or the bulging portion forming space.

The second mold apparatus of the present invention that solves the above-described object includes a pair of molds in which a gate is provided on a sliding surface and the mold is closed and opened by sliding on the sliding surface. In mold equipment,
A runner forming space provided on the split surfaces of the pair of molds, connecting the gate and the weir forming space connected to the cavity in a closed state, and having a portion extending substantially parallel to the sliding surface;
A rib forming space extending from the runner forming space along the split surface and thinner than the thickness of the runner forming space;
It has a bulging portion molding space that bulges at the tip of the rib molding space and is connected to the edge of the gate.

  In the second mold apparatus of the present invention, the rib forming space may be widened toward the sliding surface, or may be widened toward the side opposite to the sliding surface. Further, it may be one that expands toward both, but if the rib forming space extends toward the sliding surface, the molten metal is closed with a pair of molds closed with the mold. Leakage between the surfaces is prevented. In addition, according to the second mold apparatus of the present invention, the molten metal which is about to leak between the pair of molds closed with the mold and the sliding surface is guided from the gate to the bulging portion forming space, Leakage of the molten metal from the gate is also prevented.

The third mold apparatus of the present invention that solves the above-described object includes a pair of molds in which a gate is provided on a sliding surface and the mold is closed and opened by sliding on the sliding surface. In mold equipment,
A runner forming space provided on the split surfaces of the pair of molds, connecting the gate and the weir forming space connected to the cavity in a closed state, and having a portion extending substantially parallel to the sliding surface;
It has a rib forming space that extends from the runner formation space along the dividing surface and is separated from the cavity, and is thinner than the thickness of the runner formation space.

  According to the third mold apparatus of the present invention, since the molten metal is positively guided to the rib forming space, the rib forming space is separated from the cavity, and the molten metal guided to the rib forming space reaches the cavity. It is prevented. The rib forming space in the third mold apparatus may be widened toward the sliding surface as in the rib forming space in the second mold apparatus, or may be opposite to the sliding surface. It may be one that spreads toward the side, or may be one that spreads toward both.

  In the third mold apparatus of the present invention, it is preferable to have a bulging portion forming space that bulges at the tip of the rib forming space and is connected to the dam forming space.

  If the bulging part forming space bulging at the tip of the rib forming space is connected to the cavity beyond the dam forming space, the weir is reinforced by the molten metal solidified in the bulging part forming space, Weir folds are sometimes difficult, but if the bulging part forming space connected to the dam forming space is less effective than the bulging part forming space connected to the cavity, the dam fold is difficult to fold The problem of becoming.

  According to the present invention, the mold apparatus is devised to prevent the molten metal from leaking between the pair of molds closed with the mold and the sliding surface, or reaching the cavity from the runner forming space. Can be provided.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a cross-sectional view showing the internal structure of a low-pressure casting mold apparatus according to an embodiment of the present invention.

  A mold apparatus 1 for low-pressure casting shown in FIG. 1 adopts a side gate method used when casting a dish type vehicle wheel, and includes a lower mold 11, an upper mold 12, and a pair of horizontal molds 13. And. These molds 11 to 13 are all molds. A vehicle wheel cast using this mold apparatus 1 has a cylindrical rim and a disk provided with a window connected to the inner peripheral surface of the rim.

  FIG. 1 shows a mold apparatus 1 that is closed. In FIG. 1, a lower mold 11, an upper mold 12, and a pair of horizontal molds 13 are not shown in FIG. For the sake of clarity, the lower mold 11 is subjected to left-down hatching, the upper mold 12 is subjected to right-down hatching, and the pair of horizontal molds 13 are subjected to cross hatching.

  The lower mold 11 shown in FIG. 1 is fixedly arranged on the lower mold platen 140. On the other hand, the upper mold 12 is movable up and down. The upper mold 12 is fixed to an upper mold platen 150 that is attached to a piston rod 151 of a cylinder (not shown) and moves up and down, and moves up and down as the upper mold platen 150 moves up and down. Note that an accommodation space 141 in which piping (not shown) serving as a cooling medium conveyance path is accommodated inside the lower mold platen 140.

  The pair of horizontal molds 13 are such that the mold opens when they are separated from each other and closes when they approach each other until they come into contact. The horizontal mold 13 shown in FIG. 1 slides on the horizontal surface 140a of the lower mold platen 140 in a direction perpendicular to the paper surface of FIG. That is, in the pair of horizontal molds 13, the horizontal surface 140a of the lower mold platen 140 orthogonal to the dividing surface (parting surface) 13a becomes a sliding surface, and the mold closing and mold opening are performed along the horizontal surface 140a. FIG. 1 shows only one horizontal mold 13 of the pair of horizontal molds 13, and the one horizontal mold 13 closes by sliding toward the front of the page, and toward the back side of the page. The mold opens by sliding.

  In the mold apparatus 1 shown in FIG. 1, the upper mold 12 descends on the fixedly arranged lower mold 11 and closes to each other until the pair of horizontal molds 13 come into contact with each other, so that the cavity C is formed. It is formed. The horizontal mold 13 forms the outer peripheral surface of the rim of the vehicle wheel, and the lower mold 11 forms the front surface (design surface) of the disk of the vehicle wheel. Further, the upper mold 12 forms the inner peripheral surface of the rim and also forms the back surface of the disk.

  On the other hand, in the mold apparatus 1 that is closed, the pair of horizontal molds 13 are separated from each other and the upper mold 12 is raised so that the mold is opened. The cast product of the vehicle hole obtained by filling the cavity C with the molten metal is not separated from the rising upper mold 12, and the flange tip (so-called inner rim flange) of the rim opposite to the disk is not shown. By being pushed downward by the pushing plate, the upper die 12 is removed.

  Further, in the mold apparatus 1 shown in FIG. 1, a gate collar 161 provided with a recess 1611 is provided on a horizontal surface 140 a of the lower mold platen 140 that becomes a sliding surface of the horizontal mold 13. A stalk 170 is connected to the recess 1611, and a strainer (not shown) is set in the recess 1611. The gate collar 161 is attached to the upper end of the stalk 170 by a presser plate 162. The stalk 170 is inserted into a closed holding furnace (not shown), and the stalk 170 is provided with a heat insulating material 171. A molten aluminum is held in the holding furnace. By applying a pressure of 2 MPa or more and 10 MPa or less to the molten metal, the molten metal in the holding furnace reaches the recess 1611 through the stalk 170. Therefore, the opening of the recess 1611 becomes the gate 160 of the mold apparatus 1 shown in FIG.

A pair of horizontal 13, the cavity C in the mold closed state, the cylindrical rim forming space C _R in the circumferential direction into two leading respectively from 180 ° opposite positions on the rim molding space C _R weir forming space 131 Have. These two dam formation spaces 131 are formed in the split surfaces 13 a of the pair of horizontal molds 13. FIG. 1 shows a state in which the right half of the mold apparatus 1 is cut along a split surface 13a of a pair of horizontal molds 13, and a state in which the left half is cut along a plane different from the split surface 13a. Therefore, the weir forming space 131 is shown only on the right side of FIG. Note that the gate 160 is also provided at a position opposed to 180 °, but only the gate 160 on the right side is shown in FIG.

  The pair of horizontal molds 13 also has a runner formation space 132 that connects the gate 160 and the weir formation space 131 in a closed state. This runner formation space 132 is also formed on the split surface 13a of the pair of horizontal molds 13. At the time of filling the cavity C with the molten metal, the molten metal that has reached the gate 160 from a holding furnace (not shown) is filled into the cavity C from the weir forming space 131 through the runner forming space 132. The runner formation space 132 shown in FIG. 1 extends toward the dam formation space 131 by bending about 90 ° after the portion connected to the gate 160 rises. That is, the runner formation space 132 is provided with a portion 1321 that extends substantially parallel to the horizontal surface 140 a of the lower mold platen 140. The thickness of the runner formation space 132 in the vicinity of the weir formation space 1322 is thicker than the thickness of the runner formation space 132 in the vicinity of the gate 160. Further, the thickness of the portion 1322 near the weir formation space is such that the outer portion 1322o on the lower side (wheel outer side) that is on the horizontal plane 140a side of the inner portion 1322i on the upper side (wheel inner side) opposite to the horizontal plane 140a. Is thicker.

  Here, the description will be continued with reference to FIGS. 2 and 3 as necessary.

  2 is a view showing a cast product of the vehicle wheel cast by the mold apparatus shown in FIG. 1, and FIG. 3 is a cross-sectional view taken along line A-A ′ of FIG.

  The cast product W of the vehicle wheel shown in FIG. 2 is in a state before casting, and the rim 91, a disk (not shown) connected to the inner peripheral surface of the rim 91, and the rim 91 face each other by 180 °. A pair of weirs 92 connected to the position and a runner 93 connected to the weir 92 are provided.

  3 shows a cross-sectional view of the runner 93 shown in FIG. 3, it can be seen that the molten metal M1 solidified in the vicinity of the dam formation space 1322 shown in FIG. 1 is thicker than the molten metal M2 solidified on the side of the gate 160 from the vicinity of the dam formation space 1322. It can also be seen that the molten metal M3 solidified at the outer portion 1322o of the dam forming space vicinity portion 1322 is thicker than the molten metal M4 solidified at the inner portion 1322i.

In FIG. 1, the upper mold 12, the base space are expressed surface 120 to form a portion where there is the most thickness of the disk forming space C _D by the dotted lines, in which the rim forming space C _R, leading to a disk forming space C _D C _RD is a fairly thick space. Thus, a mold apparatus having a cavity base space C _RD is thickened is well known in the prior art (e.g., JP-A-2-41761). Further, the weir forming space 131 is a thinner space than the runner forming space 132. Here, if the molten metal in the runner formation space 132 solidifies faster than the molten metal in the cavity C, the molten metal near the portion where the weir 92 is connected in the cavity C solidifies and shrinks. The molten metal in the runner formation space 132 cannot be replenished via the. Therefore, it is necessary to solidify the molten metal in the runner forming space 132 later than the molten metal in the cavity C. In the mold apparatus 1 shown in FIG. 1, the thickness of the dam formation space vicinity portion 1322 of the runner formation space 132 is increased, and the outer portion 1322o near the root space C _RD in the dam formation space vicinity portion 1322 is further increased. By increasing the thickness of the base space C _RD , a temperature gradient is secured between the portion 1322 near the dam formation space and the root space C _RD with the thin dam formation space 131 interposed therebetween, and the molten metal in the root space C _RD Prior to solidification, the molten metal in the weir formation space 131 is prevented from solidifying.

  The pair of horizontal molds 13 also has a belly rib forming space 133 and a ventral bulge forming space 134. The belly rib forming space 133 is a space extending along the dividing surface 13a from the runner formation space 132 toward the horizontal plane 140a, and is a space having a thickness smaller than the thickness of the runner formation space 132. The ventral bulging portion forming space 134 is a space bulging at the tip 1331 of the belly rib forming space 133, and one end is connected to the edge 160 a of the gate 160 and the other end is near the dam forming space of the runner forming space 132. Connected to portion 1322. Further, the pair of horizontal molds 13 also have a back rib forming space 135 and a back bulging portion forming space 136. The back rib forming space 135 is a space that extends from the runner forming space 132 toward the opposite side of the horizontal surface 140a along the dividing surface 13a, and is separated from the cavity C. This back rib forming space 135 is also a space thinner than the runner forming space 132, similar to the belly rib forming space 133. The back-side bulging portion forming space 136 is a space that swells at the tip 1351 of the back rib forming space 135, one end connected to the edge 160 a of the gate 160, and the other end connected to the weir forming space 131.

  2 and 3 show the molten metal M5 solidified in the belly rib forming space 133 and the molten metal M6 solidified in the ventral bulge portion forming space 134. Further, a molten metal M7 solidified in the back rib forming space 135 and a molten metal M8 solidified in the back-side bulged portion forming space 136 are also shown. Referring to the cross-sectional view shown in FIG. 3, the melts M5 and M7 solidified in the rib forming spaces 133 and 135 are fin-like, and the melts M6 and M8 solidified in the bulging portion forming spaces 134 and 136, respectively. It can be seen that is a ball rib shape.

  When the molten metal flows in the runner formation space 132, the molten metal tends to enter between the divided surfaces 13a. In the mold apparatus 1 shown in FIG. 1, a belly rib forming space 133 and a back rib forming space 135 are provided, and by utilizing this tendency, the molten metal is actively guided to the spaces 133 and 135 along the dividing surface 13a. Is put into the ventral bulge portion forming space 134 and the back bulge portion forming space 136. When the molten metal that has passed through the abdominal rib molding space 133 and the back rib molding space 135 enters the abdominal bulging portion molding space 134 and the back bulging portion molding space 136, the space suddenly expands to a negative pressure state. Therefore, the molten metal stays in the ventral bulge portion forming space 134 or the back bulge portion forming space 136, and while being retained, the pair of horizontal molds 13 is deprived of heat and solidifies. Therefore, the molten metal does not enter between the divided surfaces 13a until it exceeds the ventral bulge portion forming space 134 and the back bulge portion forming space 136. Therefore, in the mold apparatus 1 shown in FIG. 1, the vent is formed between the pair of horizontal molds 13 and the horizontal plane 140 a that is the sliding surface of the pair of horizontal molds 13 by the ventral bulge portion forming space 134. Leakage is prevented.

  Further, as described above, since it is necessary to solidify the molten metal in the runner forming space 132 later than the molten metal in the cavity C, when the molten metal in the cavity C solidifies, the mold is opened and the cast product is removed. At that time, the molten metal in the runner formation space 132 is still semi-solidified, and a part of the runner 93 left torn in the middle of the runner 93 shown in FIG. 2 blocks the gate 160 shown in FIG. There is. However, in the mold apparatus 1 shown in FIG. 1, due to the difference in the thickness of the space, the molten metal in the rib forming spaces 133 and 135 and the molten metal in the bulging portion forming spaces 134 and 136 are more than the molten metal in the runner forming space 132. The solidified runner 93 is reinforced by the molten metal solidified in these spaces 133 to 136.

  Furthermore, one end of both the ventral bulge portion forming space 134 and the back bulge portion forming space 136 is connected to the edge 160 a of the gate 160. For this reason, the molten metal that is about to leak between the pair of horizontal molds 13 and the horizontal surface 140a from the gate 160 is guided to the ventral bulge portion molding space 134 and the back bulge portion molding space 136, Leakage of the molten metal from the gate 160 is also prevented. That is, molten metal that has passed through the rib forming spaces 133 and 135 enters the bulging portion forming spaces 134 and 136, and a certain amount of molten metal directly enters from the gate 160 toward the dam forming space 131. Flowing. As described above, in the mold apparatus 1 shown in FIG. 1, the leakage of the molten metal from the gate 160 is prevented. However, just in case, the molten metal reaching the gate 160 is between the horizontal mold 13 and the lower platen 140. A gate bracket 163 is also provided to prevent leakage.

Furthermore, the belly rib forming space 133 and the back rib forming space 135 are separated from the cavity C. The end of the stomach rib forming space 133 on the cavity C side is a dam forming space vicinity portion 1322, and the end of the back rib forming space 135 on the cavity C side is a dam forming space 131. Since the molten metal in the ribs forming spaces 133, 135 are positively guided, when these ribs forming space 133, 135 is connected to the rim forming space C _R of the cavity C, the molten metal rim forming space C _R 1 and the rib 91 has a burr-like protrusion that is thicker than the cast burr formed between the divided surfaces 13a where no rib forming space is provided. According to the mold apparatus 1 shown in FIG. Since the stomach rib forming space 133 and the back rib forming space 135 are separated from the cavity C, the molten metal is prevented from reaching the cavity C. In addition, if each bulging portion forming space is connected to the cavity C beyond the dam forming space 131, the dam 91 is reinforced by the molten metal solidified in the bulging portion forming space, and the dam folding performed at the time of casting is performed. However, since the ventral bulge forming space 134 shown in FIG. 1 is connected to the portion 1322 near the dam forming space and the back bulging portion forming space 136 is connected to the dam forming space 131, the cavity Compared with the bulging portion forming space connected to C, the reinforcing effect of the weir is weakened, and the problem that weir folding becomes difficult does not occur.

  Also, a vent hole 138 is provided in a portion of the horizontal mold 13 that forms the inner rim flange of the rim of the vehicle wheel. The vent hole 138 communicates with the cavity 13 b in the horizontal mold 13.

  The lower mold | type 11 has the nest | insert 112 which forms the front surface of the boss | hub part provided in the disk of a vehicle wheel in the center part. The insert 112 has a two-piece structure including a base 1120 and a hub hole forming body 1121. The hub hole forming body 1121 protrudes toward the upper mold and forms a hub hole of the vehicle wheel. The hub hole forming body 1121 is hollow, and an air cooling pipe (not shown) is disposed in the hub hole forming body 1121. A water cooling pipe 1122 is also embedded in the base 1120. Further, a water cooling pipe 1111 is embedded in the lower mold so as to surround the base body 1120 of the insert 112.

Inside the upper mold 12, a cavity 12 a having a central portion opening toward the lower mold 11 is provided. The upper mold 12 also has a nesting 20, and the nesting 20 of the upper mold 12 is disposed in the cavity 12a so as to close the opening 12b in the central portion of the cavity 12a. Nested 20 of the upper mold 12, to form a rear surface of the boss portion of the vehicle wheel, but also to form riser forming space R leading to the boss forming space portion C _B of the cavity C as shown in FIG. A storage chamber 21 is provided in the central portion of the insert 20 of the upper mold 12. In the accommodation chamber 21, the demarcating member 220 having the inner peripheral edge 221 is stacked with a gap connected to the hot water forming space R between adjacent demarcating members 220. The hot water forming space R is defined by the inner peripheral edge 221 of each of the defining members 220 stacked in the accommodation chamber 21. The storage chamber 21 has a peripheral wall 211 and an upper lid 212. The upper lid 212 is fixed to the peripheral wall 211 by bolts 213 and is in contact with the uppermost defining member 220. A pressing bolt 214 is provided on the upper lid 212, and the defining member 220 is pressed downward by the pressing bolt 214. For this reason, it is prevented that the demarcating member 220 floats up when the molten metal is filled into the cavity C. Further, the uppermost demarcating member 220 has a space S between an outer peripheral portion from a position outside the inner peripheral edge 221 to the outer peripheral edge 222 and the upper lid 212. The space S and the gap provided between the demarcating members 220 adjacent in the accommodation chamber 21 are connected by a not-shown vertical groove provided on the outer peripheral edge 222 of each demarcating member 220. An air flow path pipe 31 is connected to the space S in the storage chamber 21. When the molten metal is filled into the cavity C, the air in the cavity C reaches the space S in the storage chamber 21 through the gap provided between the adjacent defining members 220 and passes through the air flow path pipe 31. Discharged outside. The air in the cavity C also escapes from the vent hole 138 provided in the horizontal mold 13. On the other hand, immediately after the filling of the molten metal into the cavity C is completed, pressurized air is supplied from the air passage pipe 31. The molten metal filled in the hot water forming space R is pushed by the pressurized air supplied by the air flow path pipe 31 from the gaps different in the height direction provided between the adjacent demarcating members 220, and sufficient A feeder effect is obtained.

In addition, two types of cooling means including an air cooling pipe 121 and a mist cooling means 122 are provided in the cavity 12 a of the upper mold 12. The air cooling pipe 121 performs cooling by blowing air from a plurality of locations different in the height direction corresponding to the rim width direction of the vehicle wheel. The mist cooling means 122 performs cooling by spraying water. The mist cooling means 122 shown in FIG. 1 sprays water toward the portion of the rim of the vehicle wheel that forms the hump provided on the side opposite to the disk (so-called inner side). spread, the entire part corresponding to the inner side of the rim forming space C _R is strongly cooled.

  Next, a modified example of the ventral bulge portion forming space 134 will be described with reference to FIG. In the following description, descriptions overlapping with those described so far will be omitted, and components having the same names as the names of the components described so far will be described with the same reference numerals used.

  FIG. 4 is a view showing a modification of the ventral bulge forming space shown in FIG.

  One end of the ventral bulge forming space 134 in this modification is connected to the edge 160 a of the gate 160. The ventral bulge forming space shown in FIG. 1 is a portion where the runner formation space 132 is bent by approximately 90 ° toward the weir formation space 131, and is bent by approximately 90 ° similarly to the runner formation space 132, and in the vicinity of the weir formation space. Although it is one thing connected to the part 1322, the ventral bulge part shaping | molding space 134 of the modification shown in FIG. 4 is branched. That is, the ventral bulge portion forming space 134 of the modification shown in FIG. 4 has a standing space portion 1341 and an inclined space portion 1342 branched in the middle of the standing space portion 1341. The standing space portion 1341 shown in FIG. 4 extends from the edge 160a of the gate 160 in the direction in which the runner formation space 132 rises from the gate 160, and extends substantially parallel to the horizontal surface 140a of the lower mold platen 140. It is a space connected to 1321. On the other hand, the inclined space portion 1342 is a space branched in the middle of the standing space portion 1341 and connected to the dam formation space vicinity portion 1322. A certain amount of molten metal directly enters the ventral bulge forming space 134 connected to the edge 160 a of the gate 160 from the gate 160. As the pressure applied to the molten metal in the holding furnace (not shown) increases, the amount of molten metal that directly enters the ventral bulge forming space 134 from the gate 160 increases. By connecting the ventral bulging portion forming space 134 to the edge 160a of the gate 160, leakage of the molten metal from the pouring gate 160 is prevented. If the molten metal directly enters, the molten metal that has passed through the belly rib forming space 133 may not be solidified in the ventral side bulging portion forming space 134. Therefore, in this modification, the edge 160a of the gate 160 and the runner formation space 132 are separated at the shortest distance so that the molten metal that has directly entered the ventral bulge portion forming space 134 from the gate 160 can quickly escape to the runner formation space 132. The standing space part 1341 to connect is provided, and the molten metal that has passed through the belly rib forming space 133 is easily solidified in the belly side bulging part forming space 134. By doing so, leakage of the molten metal from the gate 160 is prevented, and leakage of the molten metal to the horizontal surface 140a is more reliably prevented.

  In the above description, the low pressure casting mold apparatus used when casting the vehicle wheel has been described as an example. However, the present invention provides a mold apparatus used when casting an article other than the vehicle wheel. Can also be applied. The present invention can also be applied to a mold apparatus for pressure casting other than low pressure casting.

It is sectional drawing which shows the internal structure of the casting_mold | template apparatus for low pressure casting which is one Embodiment of this invention. It is a figure which shows the cast product of the wheel for vehicles cast with the casting_mold | template apparatus shown in FIG. FIG. 3 is a cross-sectional view taken along the line A-A ′ of FIG. 2. It is a figure which shows the modification of the ventral bulging part shaping | molding space shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mold apparatus 11 Lower mold 12 Upper mold 13 Horizontal mold 13a Dividing surface 131 Weir formation space 132 Runner formation space 133 Abdominal rib molding space 134 Abdominal side bulging part molding space 135 Back rib molding space 136 Back side bulging part molding space 137 Perimeter demarcation surface 140a Horizontal plane 160 Gate 160a Edge C Cavity

Claims (2)

In a mold apparatus provided with a pair of molds in which a gate is provided on the sliding surface and the mold is closed and opened by sliding on the sliding surface.
A runner that is provided on the split surfaces of the pair of molds, connects the gate and the weir forming space connected to the cavity in a closed state, and connects to the weir forming space through a surface orthogonal to the sliding surface. Formation space,
A rib forming space that extends along the dividing surface from the runner formation space toward at least the sliding surface, and is thinner than the thickness of the runner formation space;
The rib forming space bulges to the tip, and one end is connected to the edge of the gate, and the other end is connected to the dam forming space or the portion of the runner forming space connected to the dam forming space . A mold apparatus having a molding space. The mold apparatus according to claim 1,
The bulging portion forming space includes a standing space portion extending in a direction rising from an edge of the gate and connected to the runner forming space , and a weir formation of the runner forming space branching in the middle of the standing space portion. A mold apparatus comprising an inclined space portion connected to a portion connected to the space.

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