JP4804281B2 - Casting mold apparatus and casting method using the casting mold apparatus - Google Patents

Description

  The present invention relates to a casting mold apparatus for forming concave portions on upper and lower surfaces of a cast product, for example, an upper wall, and a casting method using the casting mold apparatus.

  As this type of conventional casting mold apparatus, for example, one described in Patent Document 1 below is known.

  This conventional casting mold apparatus has a structure of a three-part core consisting of a center core used for piston casting and side cores arranged on the left and right of the center core, and both sides formed in an inclined shape of the center core. A convex slide piece is provided at the center of the surface, and slide grooves into which the slide piece is fitted are formed on both inclined side surfaces of the both side cores.

When the center core moves upward while the slide piece is fitted in the slide groove, both side cores move to the center, and casting is performed in this state, so that the center core of the three-part core and the tips of both side cores An undercut groove for forming a rib of the piston skirt is formed on the outer periphery.
JP-A-6-39515

  However, in the conventional casting mold apparatus, as described above, an undercut groove portion is formed in the piston skirt portion using a three-part core. When different undercuts are simultaneously formed on the crown surface of the piston, a similar casting mold apparatus must be provided in addition to the casting mold apparatus.

  For this reason, it is necessary to provide a drive mechanism for driving each of the center cores. As a result, the structure of the entire apparatus becomes complicated and the size of the apparatus must be increased.

  The present invention has been devised in view of the technical problems of the conventional casting mold apparatus, and a new drive is achieved by moving a side core or the like forming one concave portion downward by an urging member or its own weight. There is provided a casting mold apparatus and a casting method therefor, which do not require a source and can simplify and downsize the apparatus.

The invention according to claim 1 is a casting mold apparatus of a cast product in which recesses are respectively formed on the front and back surfaces of a predetermined portion, and an upper mold and a lower mold that respectively form the recesses of the cast product, respectively constituted by divided core comprising a slidable Philip core center core and each of said center core, at least the upper mold of the center core and Philip core, as well as cooperative slidably by the slide mechanism, the elastic force or It is characterized by being able to move relative to gravity.

According to the present invention, and the upper mold Philip core, due to the relatively movable including sliding movement to each other with respect to the center core by using the own weight or the biasing force, a special drive mechanism for driving and these Philip core There is no need to provide it. Therefore, the casting mold apparatus can be simplified and downsized.

In addition, since the Philip core is slid relative to the center core, the so-called mold galling during die casting can be prevented.

  According to a second aspect of the present invention, one concave portion of the predetermined portion is formed in a substantially circular shape and has an undercut portion, and the inner surface of the other concave portion is formed in a substantially vertical shape. It is characterized by being.

In the invention according to claim 3, in the split core for forming one concave portion having the undercut portion, the center core is formed in a rectangular cross section, and both end surfaces are tapered at the tip. is of a tapered surface, said pair of Philip core to the tapered end surfaces of said being slidably disposed through the slide mechanism, a pair of support Idokoa on both sides of the other side is the disjunction capable disposed ,
The pair of sub Idokoa, together are supported by the openable mold, as characterized by in accordance with the rearward movement of the center core and Philip core is provided to be close move relative to each other through said matrix Yes.

According to the present invention, after casting the cast product, for example, when the center core of the lower mold is moved backward, the lip core slides along both sides of the taper and the phillic cores approach each other (contracted). Move in the radial direction). In addition, the lower side core moves away from the inner peripheral surface of the concave portion of the cast product by moving in the direction of approaching each other (the direction of diameter reduction) after the center core and the lip core move backward. For this reason, even when the cast product has an undercut portion on the entire peripheral wall of the concave portion, it is easy to remove the mold, and it is possible to reliably prevent the cast product from being bitten by the mold.

In the invention according to claim 4, divided core for molding a one recess having an undercut portion, said Philip core of at least two planes are arranged along a center core, said Philip core and center core Is biased in a direction away from each other by a biasing member.

According to the present invention, since the lower center core and the lip core can be moved in the separation direction relatively by the urging force of the urging member, a special drive mechanism for moving them apart is unnecessary. become. Therefore, the apparatus can be simplified.

In the invention according to claim 5, the split core for forming the other concave portion has a center core whose both side surfaces are formed in a tapered shape with a tapered tip,
A pair of lip cores that slide and move on both tapered side surfaces of the center core via a slide mechanism, and each lip core moves up and down inside a top core that forms part of the outer surface of the cast product. It is characterized in that it is supported in such a manner that it is arranged so as to be detachable from a substantially vertical wall of the recess.

According to the present invention, the lip core can be easily separated from the substantially vertical wall in the recess, so that the die-cutting property is improved and the occurrence of galling of the cast product to the mold is ensured. Can be prevented.

In the invention according to claim 6, the split core that forms the other recess is constituted by the upper mold, and the center core is fixed to the lower surface of the adapter that moves up and down, While being arranged along the inner axial direction of the top core supported by the lower part of the adapter so as to be movable up and down, the Philip core expands and contracts as the center core slides up and down inside the top core. The lip core and the top core are supported so as to be capable of moving in diameter, and are supported at the lower part of the adapter so as to be able to move downward by their own weights.

According to this invention, since the lip core is formed so as to be movable in the vertical direction by its own weight, a driving mechanism for driving the lip core is not required, and the apparatus can be simplified and the cost can be reduced.

The invention according to claim 7 is characterized in that the center core and the lip core are provided so as to be vertically movable by a drive mechanism via the adapter.

  Since the center core is driven up and down by the drive mechanism to ensure reliable driving, it is possible to reliably prevent galling of the mold with respect to the cast product.

In the invention according to claim 8, the split core that forms the other concave portion is constituted by the upper mold, and the center core is disposed at the lower part of the adapter so as to be vertically movable, While being arranged along the inner axial direction of the top core fixed to the lower part of the adapter, the Philip core is provided inside the top core so as to be movable up and down, and It is characterized in that it is held so as to be able to expand and contract as it slides and is biased downward along the center core by a biasing member.

According to the present invention, the phillic core is forcedly urged and moved downward by the urging member instead of its own weight, so that the mold clamping work efficiency is improved, and both the tapered side surfaces of the center core at the time of mold clamping are improved. As a result, it is possible to prevent the occurrence of burrs and the like in the cast product.

The invention described in claim 9 is characterized in that a gap is formed between the lower surface of the adapter and the upper surface of the Philip core .

It is possible to have a slight play in Philip core by the formation of a gap, in particular, when sliding the Philip core downward by the biasing force of the biasing member during clamping, even if inclined Philip core center It can be prevented from hitting the core, and a smooth lowering action can be obtained.

The invention according to claim 10 is a casting method of a cast product in which recesses are formed on the upper and lower surfaces of a predetermined part, respectively, and a mother die divided into left and right by a gate and a runner and the divided mother die A fixed base member, and an upper mold and a lower mold which are arranged at upper and lower positions of the divided mother mold and form upper and lower recesses of the cast product, respectively, a center core and a lip core slidable on the center core ; and a split core which is composed, provided slidably to each other by the slide key and the center core and Philip core of at least the one of the divided cores, castings by pouring the molten material from the sprue after forming the, with increasing while relatively moving to each other said upper die of the center core and Philip core, One moved relative to each other the lower mold of the center core and Philip core Is lowered by releasing it, followed by mold opening the two mold is characterized in that the casting was held by the base member.

According to this casting method, since the upper and lower molds are each composed of the center core and the lip core that slides on the center core, it is possible to prevent the occurrence of mold galling during molding of a cast product having concave portions on the upper and lower surfaces.

  Moreover, since a special drive source is not required, the casting mold apparatus can be simplified.

  Hereinafter, embodiments of a casting mold apparatus according to the present invention will be described in detail with reference to the drawings.

  This casting mold apparatus manufactures a cast product from an aluminum alloy material, and this cast product 01 is formed in a die block shape as shown in FIG. 1 concave portion 02 and second concave portion 03 are formed, and the lower first concave portion 02 has an undercut portion 02a formed on the inner peripheral surface, while the upper second concave portion 03 is formed in a substantially planar rectangular shape. Thus, both side surfaces 03b and 03c rising from the bottom surface 03a are formed in a substantially vertical surface, and both front and rear end surfaces 03d and 03e are formed in an inclined shape. Further, a projecting portion 03f extending in the lateral direction is formed at a substantially central position of the bottom surface 03a of the recess 03 so as to connect the both side surfaces 03b and 03c.

  1 to 7 show a first embodiment of the casting mold apparatus, which is provided in a lower mold 1 supported on a base outside the figure so as to be movable up and down and on a casting machine outside the figure so as to be movable up and down. The upper mold 2, the plate-shaped base member 3 for movement restriction disposed at the upper position of the lower mold 1, and the upper mold 2 and the upper mold 2 are disposed in the left-right direction. There are mother dies 4 and 5 provided so as to be freely openable and closable.

  The lower mold 1 includes a rectangular plate-shaped center core holder 6 that is vertically moved by, for example, a hydraulic drive mechanism provided on the base, and a flat plate shape that is fixed to a substantially central position on the upper surface of the center core holder 6 with a bolt or the like. A lower center core 7, a lower lip core 8, 9 that is a pair of left and right side cores that can slide up and down along both end faces 7 a, 7 a of the center core 7, and 90 degrees of the lip core 8, 9. It is mainly composed of a pair of side cores 10 and 11 which are arranged at positions and provided so as to be movable toward and away from the center core 7.

  As shown in FIGS. 1 to 3, the center core holder 6 is formed in a plate shape having a substantially T-shaped cross section, and the lower center core 7 is formed on the upper surface of the upper end portion 6a having a rectangular cross section. The spring members 12 and 13 which are compression coil springs that bias both the lip cores 8 and 9 upward are accommodated in spring accommodating grooves 6b formed in the front and rear portions. Is arranged.

  The lower center core 7 has both end surfaces 7a, 7a tapered upward and slide grooves 14, 15 at the center in the width direction of the both end surfaces 7a, 7a. It is formed up to a predetermined range in the direction.

  The phillic cores 8 and 9 have rectangular lower end portions 8a and 9a which are detachably attached to the upper surface of the center core holder 6, and opposite inner end surfaces slide on both side surfaces 7a and 7a of the center core 7. A part of the shape of the concave part 02 including the undercut part 02a formed in the lower part of the cast product 01 is formed on the outer surface of the upper end part 8b, 9b (core) while being formed in a flat shape that can be contacted. It is formed in a convex shape. Also, slide keys 16 and 17 that are fitted in the slide grooves 14 and 15 and are slidably guided in the vertical direction are fixed by a plurality of bolts 18 at the lower portions of the inner end surfaces of the phillic cores 8 and 9. ing. Further, both the lip cores 8 and 9 are formed with holding grooves for fitting and holding the upper end portions of the spring members 12 and 13 on the lower surfaces of the lower end portions. The center core 7 is biased obliquely upward from below along the taper of both end faces 7a, 7b. The slide grooves 14 and 15 and the slide keys 16 and 17 constitute a slide mechanism.

  As shown in FIG. 3, the side cores 10 and 11 are erected on horizontal base portions 10a and 11a formed in a substantially L-shaped longitudinal section, and opposite end edges of the base portions 10a and 11a. It consists of cores 10b and 11b that can be separated from and attached to both side surfaces of the core 7 and the Philip cores 8 and 9, respectively. The bases 10a and 11a are held on the lower surface of the base member 3 so as to be horizontally movable in a direction (separating diameter direction) away from each other by a moving mechanism (not shown), whereby the cores 10b and 11b are centered. It arrange | positions so that it can detach / connect with respect to the core 7 grade | etc.,. In each of the cores 10b and 11b, the outer surface of the substantially flat circular arc-shaped neck portion has a part of the inner peripheral surface including the undercut portion 02a of the first recess 02. .

  The base member 3 is formed in a substantially plate shape, and a substantially rectangular thick portion 3a is integrally formed at a substantially center, and upper ends of the lip cores 8 and 9 are formed at the center of the thick portion 3a. The insertion holes 3b are formed so that the portions 8b and 9b and the cores 10b and 11b are inserted from below and project upward.

  As shown in FIGS. 1 to 3, each of the mother dies 4, 5 is divided into left and right parts, and a half-shaped concave part that jointly forms the rectangular outer shape of the casting 01 on the opposing inner surface. 4a and 5a are formed, and halved holding grooves 4b and 5b for holding a part of the upper die 2 together are formed at the upper positions of the concave portions 4a and 5a, respectively. In addition, halved groove portions 4c and 5c for forming a gate for pouring molten metal into the recessed portions 4a and 5a are formed in these side portions.

  As shown in FIGS. 1, 2 and 7, the upper mold 2 is provided with an adapter 19 provided so as to be movable up and down by a hydraulic cylinder or the like not shown, and disposed below the adapter 19 so as to be movable up and down. An internal hollow top core 20, an upper center core 22 disposed in the inner axial direction of the top core 20 and fixed to the lower surface of the adapter 19 by a bolt 21, and disposed inside the top core 20, The upper center core 22 is mainly composed of a pair of upper lip cores 23 and 24 that are slidable up and down on both sides.

  The adapter 19 is formed in a substantially thick disk shape, and a bolt insertion hole 25 through which the bolt 21 is inserted is formed in the vertical direction at approximately the center. Four bolt sliding holes 27 through which four connecting bolts 26 that connect the adapter 19 and the top core 20 to each other so as to be separable from each other are inserted in the vertical direction. That is, the connecting bolt 26 is formed to have a relatively long axial length, and the head 26 a slides between the upper large-diameter portion 27 a of the bolt sliding hole 27 and the lower small-diameter portion 27 b. The male threaded portion 26b at the distal end is screwed and fixed to the four female threaded portions 20b formed on the flange-like upper end portion 20a of the top core 20, whereby the top surface 20c can be engaged and disengaged. The core 20 can slide up and down with respect to the adapter 19 by a predetermined length H between the lower surface of the bolt head 26 a and the step surface 27 c of the bolt sliding hole 27.

  The top core 20 is formed in a cup shape with a tapered lower end, a tip surface 20c that forms the upper surface of the casting 01 is formed as a flat surface, an upper cylindrical groove 20d inside, and the cylindrical groove 20d. A holding hole 20e having a rectangular cross section penetrating downward is formed, and a horizontal step surface 20f is formed between the cylindrical groove 20d and the holding hole 20e.

  As shown in FIG. 7, the upper center core 22 is formed in a plate shape having a substantially U-shaped outer shape, and both side surfaces 22a and 22a are formed in a tapered tapered surface, and a flat upper surface. A female screw hole 22b for screwing and fixing the bolt 21 is formed at substantially the center position of the end face, and dovetail slide grooves 22c and 22c are formed along the top and bottom at the upper positions of both side faces 22a and 22a. Yes. Further, step surfaces 22d and 22d that can be engaged with the step surface 20f of the top core 20 are formed at substantially the center positions in the vertical direction of both end surfaces.

  The upper lip cores 23 and 24 are accommodated and disposed so as to be movable up and down along both side surfaces 22a and 22a of the upper center core 22 in a free state inside the top core 20, and are substantially halved cylindrical upper end portions 23a. , 24a, slide keys 28, 28 which are fitted in the slide grooves 22c, 22c and guided by sliding are fixed by a plurality of bolts 29, and lower end edges of the upper end portions 23a, 24a. In addition, small-diameter lower end portions 23b and 24b having substantially a half arc shape are integrally provided. Further, step surfaces 23c, 24c that can be locked to the step surface 20f of the top core 20 at substantially the center position in the vertical direction of both outer surfaces, that is, at the boundary between the upper end portions 23a, 24a and the lower end portions 23b, 24b. Are formed so that the tip portions of the lower end portions 23b and 24b can protrude downward from the holding hole 20e at the locking position, thereby forming the second recess 03 of the cast product 01. ing. The slide grooves 22c and 22c and the slide keys 28 and 28 constitute a slide mechanism.

  Hereinafter, a casting method using the casting mold apparatus will be described.

  First, as a mold clamping procedure, as shown in FIGS. 1 and 4 to 6, the cores 10 b and 11 b of the side cores 10 and 11 of the lower mold 1 are moved downward into the insertion holes 3 b of the base member 3. (See FIG. 4).

  Thereafter, the center core holder 6 is raised by a hydraulic cylinder or the like, so that the lower lip cores 8 and 9 enter the insertion hole 3 b and the lower ends 8 a and 9 a abut against the lower surface of the base member 3. At the same time, the center core 7 moves upward between the lip cores 8 and 9 while the spring members 12 and 13 are compressed and deformed, and accordingly, the lip cores 8 and 9 are connected to each other by the tapered end faces 7a and 7a. It moves to the direction to space apart, ie, a diameter-expanding direction (refer FIG. 5).

  Thereafter, both mother dies 4 and 5 are moved closer to each other so that the opposing surfaces are brought into contact with each other. The upper die 2 adapter 19 and the top core 20 are moved downward to be accommodated and held in the holding grooves 4b and 5b of the mother dies 4 and 5 to complete the entire mold clamping operation ( (See FIG. 6).

  Subsequently, an aluminum alloy material melted from the gate in the mold clamping state shown in FIGS. 1 and 6 is poured and filled into the cavities between the molds while applying a predetermined pressure to the upper and lower surfaces of the upper wall. A casting 01 having the recesses 02 and 03 is formed.

  Thereafter, after the casting 01 is cooled and solidified in the mold, the mold is opened. First, in the lower mold 1, when the center core holder 6 is moved downward as shown in FIG. The side center core 7 also moves downward, but at this time, the lower lip cores 8 and 9 are urged upward by the spring force of the spring members 12 and 13 in the compressed state. For this reason, although the center core 7 moves downward through the slide grooves 14 and 15 and the slide keys 16 and 17, both the lip cores 8 and 9 are slightly moved downward, but the tapered lower both side surfaces 7a. , 7a is left in the upper position.

  Accordingly, the two lip cores 8 and 9 are moved in a direction in which the upper end portions 8b and 9b approach each other (diameter reduction direction), and their respective outer surfaces are separated from the inner surfaces of the first recesses 02. It is arranged close to the center side away from each undercut portion 02a.

  On the other hand, in the upper mold 2, as shown in FIG. 2, when the adapter 19 moves upward through the bolts 26, the upper center core 22 also moves upward by the same distance. That is, the center core 22 slides upward in advance with respect to the lip cores 23 and 24 via the slide groove 22 c and the slide keys 28 and 28.

  At this time, the top core 20 and the lip cores 23 and 24 are left in the lowered position without rising by the length of H of the bolts 29 due to their own weight. For this reason, each lip core 23 and 24 moves in a direction (diameter reduction direction) approaching each other as it slides on both side surfaces 22a and 22a having a tapered shape of the center core 22.

  Thereafter, when the adapter 19 rises further than the H portion, the top core 20 moves upward while being pulled by the respective bolts 29. At this time, both the lip cores 23 and 24 have the stepped surfaces 23c and 24c at the top core. Since it is in the state of being placed (locked) on the step surface 20f of 20, it also moves up.

  As a result, the lower end portion of the center core 22 and the lower end portions 23b and 24b of the Philip cores 23 and 24 are moved upward from the inside of the second recess 03 and die-cut.

  Thereafter, the mother dies 4 and 5 are moved away from each other in the left-right direction, and the entire mold is opened. Thereby, the die block-shaped casting 01 shown in FIG. 8 is placed on the upper surface of the base member 3 and automatically taken out by a predetermined jig.

  As described above, according to the present embodiment, the lip cores 8, 9, 23, and 24 are slid relative to the center cores 7 and 22 of the lower mold 1 and the upper mold 2 via the slide mechanism. Since the lip cores are moved away from each other and moved, the first recess 02 having the undercut portion 02a formed on the upper and lower surfaces of the upper wall of the casting 01, the second side surface 03b having the vertical side surfaces 03b, and the projection portion 03f are provided. It becomes possible to cast the recesses 03 simultaneously and with high accuracy. In addition, the die-cutting property can be improved and the mold can be prevented from galling with respect to the casting 01.

  In addition, since the upper mold 2 including the adapter 19 and the top core 20 can be relatively moved down by using their own weights, a special drive mechanism for driving the upper mold 2 is provided. There is no need. Therefore, the casting mold apparatus can be simplified and downsized.

  In particular, the top core 20 and the lip cores 23 and 24 can be freely moved in the vertical direction via the bolts 26 with respect to the adapter 19 and the center core 22 and are lowered by a predetermined length H by their own weight. Since it can be moved, the mold clamping operation is facilitated, and the diameter reducing action accompanying the relative movement of the lip cores 23 and 24 with the center core 22 at the time of mold opening becomes smooth. It can be performed with high accuracy.

  Further, the lip cores 8 and 9 of the lower mold 1 are urged so as to be separated from each other in the vertical direction by the spring members 12 and 13 with respect to the center core 7. Since the drive mechanism is unnecessary, the device can be simplified in this respect as well.

  9 to 11 show the second embodiment. The lower mold 1 is the same as the structure of the first embodiment, but the structure of the upper mold 2 is changed.

  That is, the hydraulic cylinder 30 is disposed on the upper surface of the adapter 19, and the piston rod 31 of the hydraulic cylinder 30 is disposed through the sliding hole 19 a of the adapter 19, and the center core 22 is disposed at the tip of the piston rod 31. Are connected via a fixing hole 22 b, and the center core 22 is driven up and down by a hydraulic cylinder 30.

  An accommodation groove 32 for accommodating and arranging a part of the upper end portion of the center core 22 is formed at the lower end of the sliding hole 19 a of the adapter 19. The top core 20 is fixed to the lower surface of the adapter 19 with bolts 33.

  Similar to the first embodiment, the lip cores 23 and 24 are provided on the tapered side surfaces 22a and 22a of the center core 22 so as to be vertically slidable through a slide mechanism including a slide groove 22c and a slide key 28. And is urged downward by the pair of second spring members 34 and 35. The second spring members 34, 35 are substantially accommodated and held in spring accommodating grooves 19 b, 19 b that are substantially V-shaped and formed in the lower part of the adapter 19, and the lower ends thereof are the respective lip cores 23, 24. It is held by the bottom of a shallow holding groove formed on the upper surface and urges the lip cores 23 and 24 along both side surfaces 22 a and 22 a of the center core 22.

  A minute gap C is formed between the upper surfaces of the lip cores 23 and 24 and the lower surface of the adapter 19 facing the lip cores 23 and 24.

  Therefore, according to this embodiment, when the mold is clamped, the lower mold 1 is the same as that of the first embodiment, but the upper mold 2 side includes the hydraulic cylinder 30 and the adapter 19 as a whole. 10, the center core 22 is pulled up by the hydraulic cylinder 30 and the upper end is held in the housing groove 32. On the other hand, the lip cores 23 and 24 are urged downward by the spring force of the second spring members 34 and 35 and moved by a predetermined amount toward each other, that is, toward the center of the center core 22. .

  Thereafter, as shown in FIG. 9, the lower surface of the flange-like upper end portion 20a of the top core 20 abuts against the upper end hole edges of the holding grooves 4b and 5b, and further lowering is restricted. The hydraulic cylinder 30 moves downward along the opposing inner surfaces of the lip cores 23 and 24 through the slide mechanism by the depth of the receiving groove 32. Then, the phillic cores 23 and 24 move in the diameter increasing direction by the tapered side surfaces 22 a and 22 a of the center core 22, and constitute a core that forms the second recess 03 together with the center core 22.

  Subsequently, in the same manner as described above, molten metal is injected into the cavity of the mold, and the cast product 01 is formed.

  Next, when performing mold opening, particularly in the upper mold 2, when the center core 22 is moved upward by the hydraulic cylinder 30 from the lowered position shown in FIG. 9, the lip cores 23 and 24 are moved to the second spring members. Since it is biased downward by the spring force of 34, 35, it moves relative to the center core 22 in the direction of diameter reduction through the slide mechanism without following up.

  Thereafter, as shown in FIG. 10, the upper die 2 ascends as a whole, the lower die 1 moves downward, and the mold opening operation is completed by the same operation as in the first embodiment. Subsequently, the casting product 01 is taken out. Is done.

  Therefore, this embodiment can obtain the same effects as those of the first embodiment. In particular, since the center core 22 is forcibly driven in the vertical direction by the hydraulic cylinder 30, each lip core 23, As a result, the occurrence of galling of the mold with respect to the casting 01 can be prevented.

  Further, since each of the lip cores 23 and 24 is always urged downward by the second spring members 34 and 35, that is, forcedly urged downward, the above-described mold clamping work efficiency is improved. The adhesion between the tapered side surfaces 22a and 22a of the center core 22 at the time of clamping is improved. Thereby, generation | occurrence | production of the parting line of the casting 01 can be prevented, and generation | occurrence | production of a burr | flash can also be prevented effectively.

  Further, by forming a minute gap C between the upper surface of each of the lip cores 23 and 24 and the lower surface of the adapter 19, the lip cores 23 and 24 can be slightly loosened. Sometimes, when the phillic cores 23 and 24 are moved downward by the urging force of the second spring members 34 and 35, even if the phillic cores 23 and 24 are inclined, it is possible to prevent occurrence of one-side contact with the center core 22, Smooth downward movement can be secured. Therefore, the mold clamping workability is further improved.

  The present invention is not limited to the configuration of each of the embodiments described above. For example, the center cores 7 and 22 and the Philips are formed according to the shape of the recesses 02 and 03 of the cast product 01, that is, the shape of the undercut portion. The external shapes of the cores 8, 9, 23, 24, etc. can be arbitrarily changed.

It is a longitudinal section showing a casting mold device concerning a 1st embodiment of the present invention. It is a longitudinal cross-sectional view of the apparatus explaining the effect | action at the time of mold opening in this embodiment. It is a disassembled perspective view of the casting die apparatus of this embodiment. It is a perspective view which similarly shows the effect | action at the time of the mold clamping of a casting die apparatus. It is a perspective view which similarly shows the effect | action at the time of the mold clamping of a casting die apparatus. It is a perspective view which similarly shows the effect | action at the time of the mold clamping of a casting die apparatus. It is a disassembled perspective view of the upper mold | type provided for this embodiment. FIG. 3 is a perspective view in which a cast product formed by the casting mold apparatus of the present embodiment is partially cut away. It is a longitudinal cross-sectional view of the casting mold apparatus concerning the 2nd Embodiment of this invention. It is a longitudinal cross-sectional view of the apparatus which shows the mold open state of this embodiment. It is a disassembled perspective view of the upper mold | type provided for this embodiment.

Explanation of symbols

01 ... Cast product 02.03 ... Concave part 02a ... Under cut part 1 ... Lower mold 2 ... Upper mold 3 ... Base member 4/5 ... Matrix 6 ... Center core holder 7 ... Lower center core 7a, 7b ... Both sides 8 ········· Lower Philip Core 10 · 11 ··· Side Core 12 · 13 ··· First Spring Member 14 · 15 ··· Slide Groove 16 · 17 ··· Slide Key 19 ··· Adapter 20 ··· Top Core 22 ··· Upper Center Core 22a ··· Both Sides 23 · 24 ... Upper Philip core

Claims (10)

A casting mold apparatus for castings in which recesses are respectively formed on the front and back surfaces of a predetermined part,
The upper and lower molds for forming respectively a respective recess of the casting, constitutes the split cores each comprising a slidable Philip core center core and each of said center core,
A casting mold apparatus, wherein at least the center core and the lip core of the upper mold are slidably connected by a slide mechanism and are relatively movable by elastic force or gravity.   One of the concave portions of the predetermined portion is formed in a substantially circular shape and has an undercut portion, and the other concave portion is formed such that the opposing inner side surfaces are formed in a substantially vertical shape. Item 2. A casting mold apparatus according to Item 1. In the split core for forming one concave portion having the undercut portion, the center core is formed in a rectangular shape in cross section, and both end surfaces are formed in tapered end tapered surfaces. the pair of Philip core wherein the surface is slidably disposed through the slide mechanism, a pair of support Idokoa on both sides of the other side is the disjunction can arranged,
The pair of sub Idokoa has a feature in that with being supported in an openable mold, it is provided to be close move relative to each other through the matrix in accordance with the rearward movement of the center core and Philip core The casting mold apparatus according to claim 2. Split core for molding the one recess having an undercut portion, said Philip core of at least two planes are arranged along a center core, said Philip core and the center core in a direction relatively away by the urging member The casting mold apparatus according to claim 3, wherein the casting mold apparatus is biased. The split core for forming the other concave portion has a center core formed with a tapered shape with both side surfaces tapered at the tip,
A pair of lip cores that slide through a sliding mechanism on both sides of the tapered shape of the center core,
Each of the lip cores is supported so as to be movable up and down inside a top core that forms a part of the outer surface of the cast product, and is disposed so as to be detachable from a substantially vertical wall of the recess. The casting mold apparatus according to claim 1. The split core that forms the other recess is constituted by the upper mold,
While the center core is fixed to the lower surface of the adapter that moves up and down, and is disposed along the inner axial direction of the top core that is supported by the lower portion of the adapter so as to move up and down,
The Philip core is held inside the top core so as to be able to expand and contract as the center core slides up and down,
2. The casting mold apparatus according to claim 1, wherein the Philip core and the top core are supported by the respective weights of the lip core and the top core so as to be able to move downward. The casting mold apparatus according to claim 5 or 6, wherein the center core and the lip core are provided so as to be movable up and down by a drive mechanism via the adapter. The split core that forms the other recess is constituted by the upper mold,
The center core is arranged at the lower part of the adapter so as to be movable up and down, and is arranged along the inner axial direction of the top core fixed to the lower part of the adapter,
The lip core is provided inside the top core so as to be movable up and down, is held so as to be able to expand and contract as the center core slides up and down, and is moved along the center core by an urging member. 2. The casting mold apparatus according to claim 1, wherein the casting mold apparatus is biased downward. The casting mold apparatus according to claim 8, wherein a gap is formed between a lower surface of the adapter and an upper surface of the lip core . It is a casting method of a cast product in which recesses are respectively formed on the upper and lower surfaces of a predetermined part,
A base mold divided into left and right sides by a gate and a runner, a base member disposed and fixed between the divided mother molds, and an upper and lower concave portion of the cast product are disposed at the upper and lower positions of the divided mother mold. type and the lower mold, and a split core which is composed of a slidable Philip core center core and the center core, respectively, comprises a, by the slide key and the center core and Philip core of at least the one of the divided core Provided to be slidable relative to each other,
After injecting molten material from the gate and forming a casting,
The upper core core and the lip core are raised while moving relative to each other, and the lower core core and the lip core are lowered while being moved relative to each other to release.
Thereafter, the casting product is held on a base member by opening both of the mother dies, thereby casting the casting product.

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