JPH0234268A - Method and apparatus for casting cylinder block - Google Patents

Abstract

PURPOSE:To accurately position cast-in member in upper die and lower die by holding the cast-in member positioned on a jig to the upper die with the other die constituting part to set this in the lower die, further advancing the remained die constituting part to the lower die to form cavity and pouring molten metal. CONSTITUTION:A liner 59 and water jacket core 48 as the cast-in member arranged as positioning on the jig 23 at waiting position P2, are held with a bore die 13, which is the other die constituting part as advancing state to the upper die 12, and carried to the molten metal pouring position P1. Successively, the liner 59 and water jacket core 48 are set to the fixed lower die 2 together with the upper die 12 and the bore die 13. Further, side dies 4, 4 of the remained die constituting part are advanced to the fixed lower die 2 to form die cavity and the molten metal is poured into the cavity. Therefore, the cast-in member can be accurately positioned to the upper die and the lower die.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a method for casting a cylinder block and a casting apparatus therefor. , liners, water jacket cores, etc., can be automatically positioned at predetermined positions with high precision.

(Prior Art) A conventionally known low-pressure casting method, particularly a casting method in which a core can be automatically set in a mold, is disclosed in, for example, Japanese Patent Application Laid-open No. 179860/1986 (Japanese Patent Application No. 20566/1982). There are some that have been disclosed.

This consists of a lower base for attaching the lower mold, a core surface plate for temporarily holding the core, and a product receiving mechanism for picking up the product released from the upper mold in the horizontal direction. A first trolley is provided above the lower die base and the core surface plate to reciprocate between the lower die base and the core surface plate, and a core gripping mechanism is mounted on the first trolley so as to be movable up and down. A low-pressure casting device is provided, in which a second trolley is provided above the lower die base and the product receiving mechanism to reciprocate between these, and the second trolley is equipped with an upper guide base to which the upper die is attached so as to be movable up and down. Here, we first operate the two front and rear cylinders attached to the first truck, and fit the tip of the piston rod into the hole in the core surface plate. After positioning the core, the lower part of the core gripping mechanism is inserted into the hole in the core to hold the core under its pressurized expansion, and then the piston rod is removed from the core platen. In addition to successively extracting the core and lifting the core from the core surface plate by raising the core gripping mechanism, the first cart is moved to a position directly above the lower mold, and is positioned and fixed there. By extending the aforementioned piston rod and fitting it into the hole in the lower mold, the core gripping mechanism and, by extension, the core held therein are positioned with respect to the lower mold. After that, lower the core gripping mechanism to remove the core.
inserted into a predetermined hole in the lower mold, where compressed air is discharged through its core gripping mechanism to release the core therefrom, and subsequently,
By raising both the piston rod and the core gripping mechanism, setting of the core in the lower mold is completed.

After completing the automatic core setting in this way, the first cart is evacuated onto the core surface plate, and the second cart is moved to a position directly above the lower mold and positioned there. Then, the molten metal in the holding furnace is press-fitted into a cavity defined by overlapping the upper mold and the lower mold held by the second truck.

After the press-fitted molten metal has solidified to some extent, the upper and lower molds are opened, and the product adhering to the upper mold is transferred to directly above the product receiving mechanism based on the movement of the second cart, where it is The product is dropped onto the receiving member in the raised position, and finally, the receiving member is lowered to its original position, thereby completing the series of low-pressure casting operations.

(Problem to be Solved by the Invention) However, in this prior art, when automatically feeding the core on the core surface plate to the lower mold, the core gripping mechanism for the core on the core surface plate is Positioning is performed by fitting two piston rods into respective holes provided in the core surface plate, and positioning of the core held by the core holding mechanism with respect to the lower mold is also done by: two piston rods,
This is done by fitting two piston rods into each hole provided in the lower mold, and from the time when the core is held by the core holding mechanism to the time when the core is inserted into the lower mold. Since positioning is required twice, there is a problem in that the final positioning accuracy of the core relative to the lower mold cannot be sufficiently increased, and when positioning the core relative to the heated lower mold. However, there was a problem in that it was extremely difficult to fit the two piston rods into the respective holes provided in the lower mold at the same time due to thermal deformation of the lower mold.

This invention was made by focusing on such problems in the prior art, and regardless of whether the lower mold is heated or not,
To provide a method for casting a cylinder block and a casting device thereof, which can sufficiently improve the positioning accuracy of cores and other cast members with respect to the lower mold, and can perform the positioning extremely simply and quickly. It is.

(Means for Solving the Problems) The cylinder block casting method of the present invention is such that when a cylinder block using a cast member is manufactured by low-pressure casting of molten aluminum alloy, one side of the pouring position is Another mold in which cast members, such as a liner and a water jacket core, are positioned and arranged on a jig at an adjacent predetermined standby position, and each is placed in an advanced position with respect to the upper mold at a position directly above the jig. component parts,
For example, the liner and water jacket core are held in the bore mold and the front and rear molds and transported to the pouring position, and then the liner and water jacket core are held in the above-mentioned state while the upper mold and associated mold structure are assembled. Along with the parts
The mold cavity is formed by setting the fixed lower mold in a predetermined position, and then moving the remaining mold components, such as the horizontal mold, toward the fixed lower mold to form a mold cavity, and then low-pressure pouring into the mold cavity. This is what we do.

Note that the term "cast member" here includes not only the liner, but also all members that are once cast in a predetermined position within the cylinder block, such as a water jacket core, etc. In this invention, the liner or It is possible that only one of the water jacket cores is a cast member.

Further, the cylinder block casting apparatus of the present invention has a fixed lower mold attached to a lower fixed plate at a pouring position, and an upper mold fixed to a mold mounting frame and moved up and down relative to the fixed lower mold. In an apparatus comprising a horizontal type, a bore type, and a front and rear type that contribute to the formation of a mold cavity in the advancing posture with respect to each of these molds, a cast member is placed at a standby position adjacent to one side of the pouring position. While placing a jig to position and support the liner pipe and water jacket core, a horizontal mold is attached to the lower fixed plate so that it can move forward and backward relative to the fixed lower mold provided there, and a frame is installed to install the mold. , at least, is connected to a traveling carriage that reciprocates between a pouring position and a standby position so as to be able to rise and fall, and the mold is attached to a frame, and a bore type and a Each of the front and rear molds is installed, and a suction opening that is connected to a pressure reducing means and sucks the liner onto the bore mold is provided on the circumferential surface of the bore mold. It has a wooden insertion part.

(Function) According to the above-mentioned invention, in the standby position, the cast member positioned on the jig, such as the liner and the water jacket core, is fully injected into the liner by the bore type in the advanced position. Directly and accurately with high precision, the liner is tightly fitted, the liner is adsorbed under reduced pressure to the circumferential surface of the bore mold, and the core skirting board is fitted into the insertion part of the front and rear molds in the extended position. After positioning and holding,
At the pouring position, simply set the upper mold, the extended bore mold, and the front and rear molds in position relative to the fixed lower mold; no special positioning of the liner and water jacket core relative to the fixed lower mold is required. Since they can be positioned sufficiently accurately with respect to the fixed lower mold without having to do so, the final positioning accuracy of the liner and water jacket core can be greatly improved compared to the prior art.

Moreover, here, a set of an upper mold and its associated bore mold and front and rear molds for a fixed lower mold is defined as a set of those molds for a fixed lower mold, regardless of whether the fixed lower mold is heated or not. Since the lowering can be performed simply and accurately by a predetermined amount, the liner and water jacket core can always be easily and quickly positioned with high precision.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a partially cut away perspective view of the casting apparatus of the present invention, and FIG. 2 is a perspective view and a side view of the main parts thereof.

In the figure, P is a pouring station, P2 is a waiting station adjacent to the pouring station P on one side, on the left side in the figure, and P is on the other side of pouring station P1, adjacent to the right side in the figure. Each mold changing station is shown.

Here, the lower fixing plate 1 is arranged horizontally in the pouring station P1, and the fixed lower mold 2 is fixed on this lower fixing plate. A horizontal mold 4 is provided at the center of the fixed lower mold 2 and is driven forward and backward from left and right under the action of a horizontal cylinder 3, and a molten metal holding furnace 5 is disposed below the lower fixed plate 1.

In addition, each station PI+P2+P mentioned above
3, a pair of track rails 6 are passed over the rails, and the track rails 6 support the running bogie 7 hooked thereto, and the running bogie 7 is connected to the waiting station P2 for mold exchange. Guide to travel to and from station P. By the way, the traveling carriage 7 is provided with a motor 8 for driving the traveling carriage 7, and a mold mounting frame 10 is connected to the traveling carriage 7 by an elevating cylinder 9 so as to be able to be driven up and down. The vertical movement is guided by a plurality of idle rods 11 passing through it. The upper mold 12 is fixed to the center portion of the lower surface of the mold mounting frame 10, and the upper mold 12 is fixed to the lower center portion of the mold mounting frame 10, and the upper mold 12 is fixed to the lower surface center portion of the mold mounting frame 10.
A bore mold opening/closing cylinder 14 is provided for advancing and retracting the bore mold 13 from diagonally above the upper mold 12, and a front mold 15 and a rear mold are provided on the front and rear portions of the lower surface, as shown in FIG. 2(b). A front mold opening/closing cylinder 17 and a rear mold opening/closing cylinder 18 for horizontally advancing and retracting the mold 16 relative to the upper mold 12 are attached.

Here, a lifter 19 and a traverse rail 20 are respectively disposed in a standby station P2 adjacent to the left side of the pouring station P1.
extends in the front-rear direction via the standby station P2. Two carts, a core transport cart 21 and a work loading cart 22, are respectively engaged with the traverse rail 20, and a core setting jig 23 is mounted on the core transport cart.
A workpiece holder and a jig 24 are respectively positioned and placed on the workpiece loading cart. Each of these trolleys 21.2
2, each row reactuator 25.26 is connected to the trolley 21.22 via a crank mechanism 27.28.
Based on the operation of , it is possible to travel from each end of the traverse rail 20 to a standby station position, in other words, a position directly above the lifter 19. Here, the lifter 19 operates when any of the carts is brought to a position directly above it, and moves the jig on the cart into engagement between the recess 29 provided there and the locate pin 30 of the lifter 19. It functions to raise it to a predetermined height at the bottom.

Furthermore, a running rail 31 extending in the front-rear direction is installed at the mold changing station P3, and a mold changing cart 32 is placed on this running rail.

The main parts of the casting apparatus as described above will be explained in detail below based on FIG. 3.4.

In the case shown in FIG. 3, a pouring port 33 provided on the fixed lower mold 4 on the lower fixed plate is connected to the molten metal holding furnace 5 shown in FIGS. 1 and 2 via a feeder 34 and a stalk 35, while A lower mold 1 is mounted on the lower surface of a mold mounting frame 10 connected to the lifting cylinder 9 via a box-shaped bracket 36.
2 is mounted by an unillustrated clamper having an automatic attachment/detachment function via an upper mold mounting plate 37 which also functions as a spacer, and an ejector turbine 3B disposed vertically penetrating the upper mold 12 is connected to the upper mold 12. It is connected via a frame plate 39 to a product extrusion cylinder 40 attached to the upper surface of the mold mounting frame 10.

Further, the bore mold 13 is connected to a mold mounting plate 41 provided at the rod end of the bore mold opening/closing cylinder 14 by a clamper (not shown) which also has an automatic attachment/detachment function. As shown in FIG. 3(b), the vacuum pump 42 is equipped with a solenoid valve 43 and a liner adsorption circuit 44.
A suction opening 45 is connected to the vacuum pump 42 through a solenoid valve 46 and a gas suction circuit 47, and a suction opening 45 is connected to the vacuum pump 42 through a solenoid valve 46 and a gas suction circuit 47, and a suction opening 45 is connected to the vacuum pump 42 through a solenoid valve 46 and a gas suction circuit 47. , and an exhaust gas opening 49 for suctioning and removing the generated gas.

Here, preferably, a groove 51 into which the baseboard 50 of the water jacket core 48 can be fitted is provided in the diameter-reduced end wall of the bore mold 13.
This advantageously improves the gas suction efficiency at the exhaust gas opening 49.

Furthermore, here, the front and rear molds 15, 16 are also attached to the opening/closing cylinder 17.
The baseboards of the water jacket core 48 are connected to the mold mounting plates 52 and 53 provided at the ends of the rods 18 and 18 by clampers (not shown) similar to those described above, and the baseboards of the water jacket cores 48 are connected to the mold surfaces of the molds 15 and 16. Insertion holes 55 and 56 are provided for fitting the end portions of 50 and 54, respectively.

In this example, both horizontal molds 4 are connected to a mold mounting plate 57 provided at the rod end of the horizontal cylinder 3 in the same manner as the other molds.

In each of the mold components constructed in this manner, the bore mold 13 and the front and rear molds 15 and 16 are placed in an advanced position relative to the upper mold 12, and the upper mold 12 is placed in a predetermined position relative to the lower mold 2. position, and then horizontal type 4,
By advancing the lower mold 2, a mold cavity 58 having a desired three-dimensional shape is defined between those molds.

Below, the operation of the above-mentioned casting apparatus will be explained.

For example, when manufacturing a cylinder block for a V-type 8-cylinder engine, first, the core carrier 21 and the core setting jig 23 are placed at one end of the traverse rail 20 as shown in FIGS. 1 and 2(b). In the state shown in FIG. 5A, eight liners 59 made of cast iron as shown in a perspective view in FIG.
Two water jacket cores 48 as shown in FIG. Based on standby station P2
There, the core setting jig 23 is moved by the lifter 19 along with the liner 59 and the water jacket core 48 positioned and mounted thereon to
) to its upper limit position shown by the imaginary line.

At this point, the upper mold 12, the bore mold 13, and the front and rear molds 15.
16 is moved to the lower limit position with the bore mold 13 and the front and rear molds 15 and 16 in the backward posture relative to the upper mold 12, as shown by the solid line in FIG. 6(a), based on the extension stroke of the lifting cylinder 9. I'm waiting.

Thereafter, based on the operation of the bore type opening/closing cinder 14, the bore type 13 is advanced relative to the upper mold 12, causing the bore type 13 to enter into the litchi, and at the same time, the third
The electromagnetic valve 43 shown in FIG. 4B is opened to communicate the suction opening 45 with the vacuum pump 42, and each liner 59 is vacuum-adsorbed onto the circumferential surface of the bore mold 13.

Here, as shown in FIG. 7, the inner circumferential surface of the liner 59 has a slope corresponding to the draft angle of the entry portion of the bore mold 13. While the liner 59 will enter the liner 59 extremely smoothly, when the bore mold 13 reaches its advancement limit, the accuracy of the liner 59 relative to the bore mold 13 will be reduced based on the close contact of the liner 59 to the circumferential surface of the bore mold. In addition to accurately positioning, insertion of molten metal between the two is completely prevented.

In addition, here, the front and rear molds 15 and 16 are also simultaneously connected to the upper mold 12.
By moving the baseboards 50° 54 of the water jacket core 48 on the jig into the insertion holes 55, 56 of the front and rear molds 15, 16, as shown in FIG. The water jacket core 48 is sufficiently advanced to accurately position and securely hold the water jacket core 48.

In this way, the liner 59 and the water jacket core 48 are connected to the bore type 13'J6 and the front and rear types 15, respectively.
, 16, the mold mounting frame 1 is moved by the contraction stroke of the lifting cylinder 9.
0, together with the bore mold 13 and the front and rear molds 15, 16, as well as the liner 59 and the water jacket core 48, to the position shown by the imaginary line in FIG. Based on the traveling movement, the liner 59 and the water jacket core 48 are accurately positioned at the pouring station P1 position, as shown by the solid line in FIG. 6(b).

Furthermore, based on the extension stroke of the lifting cylinder 9 again, the upper mold 12, the bore mold 13, and the front and rear molds 15.
16 gradually lowered, and finally they were moved to the position shown in Fig. 8 (
By accurately setting the liner 59 and water jacket core 48 in the bore mold 13 and the front and rear molds 15 and 16 at the fixed lower mold 2, as shown by the imaginary lines in a), In addition, fixed lower mold 2
Regardless of whether or not it is heated, the horizontal mold 4 is set in a predetermined position relative to the fixed lower mold 2 very smoothly and with high precision. Figure 3 (a)
As shown in FIG. 1, a mold cavity 58 having a desired three-dimensional shape is defined between each mold.

For such mold cavity 58, the molten metal in the molten metal holding furnace is transferred to the stalk 35, the feeder 34 and the pouring port 33.
At the same time, combustion gas and other gases generated in the cavity are removed from the water by closing one solenoid valve 43 and opening the other solenoid valve 46 between the pouring and solidification of the molten metal. By suctioning and exhausting from the skirting board 50 of the jacket core 48 through the exhaust gas opening 49 with the vacuum pump 42, the occurrence of gas defects in the cylinder block as a cast product is sufficiently prevented.

Here, after the molten metal has completely solidified to form the required cylinder block, first, the horizontal mold 4 is retreated relative to the fixed lower mold 2, and then the lifting cylinder 9 moves the upper mold 12, the bore mold 13, and The front and rear molds 15.16 are lifted together with the cylinder block W, as shown by the solid line in FIG. At the same time as being transferred to station P2, the elevating cylinders 9 are extended at that position to bring them to their lower limit positions.

Furthermore, after that, the waiting stator 3 is placed on the traverse rail.
In order to operate the litter 19 on the workpiece loading cart 22 which has been moved to the position 22 in advance as shown in FIG. The cylinder block W is temporarily supported by the jig 24, and the bore mold 13 is moved backward as shown in the figure, and the front and rear molds 15 and 16 (not shown) are also moved backward. By activating the cylinder block W, the cylinder block W is attached only to the upper mold 12, and then, by activating the product extrusion cylinder 40, the eject turbine 38 is made to protrude from the upper mold 12, thereby causing the cylinder block W to stick to the upper mold 12. The mold is released from the upper mold 12.

Note that during such mold release, damage to the cylinder block W can be extremely effectively prevented by synchronizing, for example, the ejection speed of the ejector turbine 38 and the descending speed of the workpiece holder jig 24.

The workpiece jig 24 that has received the cylinder block W in this way is positioned again on the work loading truck by the lifter 19, and then moved to one end of the traverse rail 20 by the truck 22. There, the cylinder block W as shown in a perspective view in FIG. 9 is transferred to the next process.

In addition, when replacing each mold with this device, for example, the fixed lower mold 2 removed from the lower fixing plate 1 and the horizontal mold 4 removed from the mold mounting plate 57 are replaced with the upper mold 2, the bore mold 13, and the front and rear molds. Together with the molds 15 and 16, they are transported to the mold exchange station P3, where they are transferred to the mold exchange trolley 3.
2 and removed onto the trolley, and then the upper molds of the respective molds transported by other trolleys are placed on the mold mounting frame 10, and the bore mold and front and rear molds are placed on the cylinder 14, 17.18 respectively, and carry the lower mold and horizontal mold together with them to the pouring station P1, where they are respectively attached to the lower fixing plate) 1 and the cylinder 3. .

Although the present invention has been described above based on the illustrated example, the mold changing station P3 can be omitted from the above, and the exhaust gas opening 49 formed in the bore mold 13 can also be omitted. Also, the baseboard 50.54 of the water jacket core 48 and the insertion hole 55 of the front and rear molds 15°16
．． It is also possible to use only one of 56.

(Effects of the Invention) Thus, according to the present invention, by positioning and holding the cast member on the jig with the bore type and/or the front and rear types, the cast member can be used not only with the bore type and the front and rear types. , it is possible to directly position the upper mold with high precision, and by setting these molds in a predetermined position relative to the fixed lower mold, the cast member can also be positioned directly against the fixed lower mold. On the other hand, since the cast member is accurately positioned at a predetermined position, the final positioning accuracy of the cast member can be significantly improved compared to the prior art.

In addition, here, the upper mold, bore mold, and front and rear molds are set to the fixed lower mold by lowering them by a predetermined amount relative to the fixed lower mold without using any locating holes or the like. Highly accurate positioning of cast parts at all times, regardless of whether the mold is heated or not.
And it can be done easily and quickly.

[Brief explanation of the drawing]

Fig. 1 is a perspective view illustrating a casting apparatus of the present invention with a part cut away; Fig. 2 is a sectional front view and side view of the main part of the apparatus shown in Fig. 1; Figs. 3 and 4; 5 is a perspective view showing the liner and water jacket core, FIGS. 6 and 8 are views illustrating the casting process of the present invention, and FIG. 7 is an enlarged view showing the main parts of the device. 9 is an enlarged view showing the relationship between the liner and the bore type, and FIG. 9 is a perspective view illustrating the cylinder block. Pl... Pouring position P2... Standby position W.
・・Cylinder block 1・Lower fixing plate 2・
...Fixed lower mold 3...Horizontal cylinder 4...
Horizontal type 6... Track rail end... Motor 10... Mold mounting frame 13... Bore type 15... Front type 17... Front type opening/closing cylinder 19... Lifter 23... Core Setting jig 43... Solenoid valve 45... Suction opening 48... Water jacket 50, 54... Skirting board 59... Liner 5... Molten metal holding furnace 7... Traveling trolley 9... ...Elevating cylinder 12...Upper die 14...Bore type opening/closing cylinder 16...Rear die 18...Rear die opening/closing cylinder 21...Core carrier 42...Vacuum pump 44... Liner adsorption circuit core 55, 56... insertion hole patent applicant daily amount

Claims (1)

[Scope of Claims] 1. When casting a cylinder block using a cast member, the cast member positioned and arranged on a jig at a predetermined standby position is placed in an advanced position relative to an upper mold. After being held by the mold components and transported to the pouring position, the cast member, together with the upper mold and its associated mold components, is set in position relative to the fixed lower mold, and then placed against the fixed lower mold. A method for casting a cylinder block, characterized in that the remaining mold components are moved forward to form a mold cavity, and then molten metal is poured into the mold cavity. 2. At the pouring position (P_1), the fixed lower mold (2) attached to the lower fixed plate (1) and the mold mounting frame (10
) is fixed to the fixed lower mold and is moved up and down with respect to the fixed lower mold, and a horizontal mold (4) which contributes to the formation of the mold cavity (58) in its advancing posture with respect to each of these molds.
), a bore type (13), and a front and rear type (15, 16), a standby position ( adjacent to one side of the pouring position (P_1));
P_2) is provided with a jig (23) for positioning and supporting the liner (59) and water jacket core (48), while the lower fixed plate (1) is provided with a fixed lower mold (2) provided thereon. A horizontal mold (4) is attached so that it can move forward and backward, and the mold mounting frame (10) is connected so that it can move up and down at least to a traveling cart (7) that moves horizontally between a pouring position and a standby position. At the same time, each of the bore mold (13) and the front and rear molds (15, 16) is attached to the mold mounting frame so as to be able to move forward and backward relative to the upper mold (12) provided there, and the circumference of the bore mold is a suction opening (
45), and an insertion part (5
5, 56).