JPH07108448B2 - Cylinder block casting equipment - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a casting device for a cylinder block, and more particularly, to a cylinder liner, a water jacket core and a crank when manufacturing a cylinder block made of, for example, an aluminum alloy by a low pressure casting method. The present invention relates to a casting device capable of automatically positioning a case core with high accuracy.

2. Description of the Related Art A low-pressure casting apparatus having a function of automatically setting a core in a die is disclosed in, for example, Japanese Patent Laid-Open No. 62-179860.

This casting device horizontally separates the lower die base to which the lower mold is attached, the core surface plate for temporarily holding the core, and the product receiving mechanism for receiving the product released from the upper mold. A first carriage that reciprocates between the lower die base and the core surface plate is provided above the lower die base and the core surface plate. A core gripping mechanism is attached to the first carriage so that it can be raised and lowered. A second carriage is provided above the die base and the product receiving mechanism so as to reciprocate between them, and an upper die base for mounting an upper die is attached to the second carriage so as to be able to move up and down.

According to this structure, the first carriage and the second carriage are alternately operated to automatically perform the positioning of the core with respect to the lower mold, the mold clamping and the pouring, the mold opening and the product removal. be able to.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above-described low-pressure casting apparatus, the core gripping mechanism releases the core after the core gripped by the core gripping mechanism is positioned in the lower mold and retracts. From that,
Until the lower mold and the upper mold are matched with each other, the core is simply placed on the lower mold and there is nothing that binds the core. Therefore, the conventional device can be applied only to the casting of a product in which the core itself has extremely excellent posture stability, and the shape of the core is complicated and unstable like a cylinder block, and the inside of the water jacket is When the core has to be positioned in a state where it is substantially floated from the lower mold like a core, the core cannot be positioned with high accuracy.

The present invention has been made in view of the above problems,
(EN) A cylinder block casting device capable of accurately positioning a cylinder liner, a water jacket core, and a crankcase core with respect to a lower mold, and further, positioning them extremely easily and quickly. is there.

MEANS FOR SOLVING THE PROBLEM The present invention firstly discloses a cylinder block W as shown in FIG.
In the crankcase C, the lower end of _one skirt S ₁ is curved inward, and a cylinder block in which the skirts S ₁ and S ₂ are formed asymmetrically with respect to a plane including the cylinder bore center line is cast. It is assumed that there is. The cylinder block having such a shape is used, for example, in an engine of a four-wheel drive vehicle.

And, the casting apparatus of the present invention, a fixed lower mold fixed to the horizontal lower fixed plate at the pouring position, a pair of horizontal molds provided on the lower fixed plate and capable of advancing and retracting with respect to the fixed lower mold, In addition to the cylinder liner and water jacket core provided at the standby position adjacent to the hot water position, the crankcase core that forms a part of the lower mold corresponding to the curved skirt part A jig for positioning at the casting mold position, a traveling carriage that is horizontally movable between the pouring position and the standby position, and has a mold mounting frame that can be raised and lowered, and a mounting frame mounted on the mold mounting frame. The
A bore die that moves up and down with respect to the fixed lower die together with the die mounting frame, and a bore die that is attached to the die mounting frame and can move back and forth in the horizontal direction with respect to the bore die together with the fixed lower die, the horizontal die, and the bore die. Front and rear molds that form a product space, and widths that are formed in the front and rear molds and that are fitted to the skirting boards of the water jacket core and the crankcase core to position and support the water jacket core and the crankcase core. A wood insertion part, a suction opening formed on the peripheral surface of the bore mold and connected to a pressure reducing means for sucking and positioning and supporting the cylinder liner on the bore mold, and a water jacket provided on the jig. Direction for positioning the core and avoiding interference with the crankcase core according to the relative vertical displacement of the jig and die mounting frame And a positioning member movable to be retracted.

Operation According to this structure, of the cylinder liner, water jacket core and crankcase core positioned on the jig, the cylinder liner is a bore type, and the water jacket core and the crankcase core are front and rear type skirting boards. After being supported by the insertion part in the previous positioning state,
By positioning the bore mold and the front and rear molds with respect to the fixed lower mold at the pouring position, the cylinder liner, the water jacket core and the crankcase core are positioned with respect to the fixed lower mold.

Then, by adding horizontal molds to the fixed lower mold, the bore mold, and the front and rear molds, positioning them relative to each other, and then pouring the molten metal, the cylinder liner, the water jacket core, and the crankcase core are positioned and supported by each mold. It will be cast until it is cast.

It should be noted that the term "cast iron" is used to mean that the cast iron is once cast at a predetermined position in the cylinder block regardless of whether the member remains as a part of the product as a result of cast iron. And

Embodiments FIG. 1 is a perspective view showing an embodiment of the casting apparatus of the present invention, and FIGS. 2 and 3 are a front view and a side view of a cross section of a main part thereof.

In the figure, P ₁ is the pouring station, P ₂ is the pouring station P ₁
A waiting station adjacent to one side (left side in the figure) and a mold exchange station P ₃ adjacent to the other side (right side in the figure) of the pouring station P ₁ are shown.

The lower fixed plate 1 is horizontally arranged at the pouring station P ₁ , and the fixed lower mold 2 is fixedly mounted on the lower fixed plate 1, and more precisely, the fixed lower mold 2 is fixed to the fixed lower mold 2. A horizontal mold 4 which is driven forward and backward from the left and right by the operation of the horizontal cylinder 3 is provided in the center of the mold 2, and a molten metal holding furnace 5 is arranged below the lower fixed plate 1.

A pair of two track rails 6 are bridged over each of the stations P ₁ , P ₂ and P ₃ described above, and the track rails 6 serve as a standby station P ₂ and a mold changing station P ₃ . A traveling carriage 7 that travels between the two is provided.

The traveling carriage 7 is provided with a motor 8 as a driving source for the traveling carriage 7 and supports a mold mounting frame 10 which is driven to move up and down by a lifting cylinder 9 so that a plurality of vertical movements of the mold mounting frame 10 with respect to the traveling carriage 7 can be performed. The guide rod 11 is used for guiding. And mold mounting frame 10
In the center part of the bottom surface of the
Further, as shown in FIG. 3, opening / closing cylinders 17 and 18 for advancing and retracting the front mold 15 and the rear mold 16 horizontally with respect to the bore mold 13 are attached to the front and rear portions of the lower surface of the mold mounting frame 10, respectively.

Standby station adjacent to the left side of pouring station P ₁
A lifter 19 and a traverse rail 20 are provided on P ₂ , and the traverse rail 20 is used as a standby station.
It extends through P ₂ in the front-back direction. Then, the traverse rail 20 is equipped with two carriages, a core transport carriage 21 and a work loading carriage 22, respectively.
A core setting jig 23 is placed on the work piece 21, and a work receiving jig 24 is placed on the work loading carriage 22. Each of these carriages 21 and 22 connects the rotary actuators 25 and 26 to the carriages 21 and 22 via the crank mechanisms 27 and 28, respectively, so that the traverse is performed based on the operation of each rotary actuator 25 and 26. It is possible to travel from each end of the rail 20 to the standby station P ₂ position, in other words, to the position directly above the lifter 19.

Here, the lifter 19 operates when either of the trucks 21 or 22 is located at a position directly above it, and the trucks 21 or 22 move.
The upper jig 23 or 24 is provided with the depression 29 and the lifter.
It functions to lift up to a predetermined height by fitting with the locate pin 30 of 19.

Further, in the mold exchanging station P ₃ , a traveling rail 31 extending in the front-rear direction is laid, and a die exchanging cart 32 is placed on the traveling rail 31.

Main parts of the above casting apparatus will be described in detail below with reference to FIGS.

In FIG. 5, the pouring port 33 provided in the lower fixed mold 2 on the lower fixed plate 1 is connected to the molten metal holding furnace 5 shown in FIGS. The upper mold 12 and the integral bore mold 13 are attached to the lower surface of the mold mounting frame 10 connected through the bracket 36,
An ejector pin 38 arranged so as to pass through the upper mold 12 in the vertical direction is connected to a product extruding cylinder 40 mounted on the upper surface of the mold mounting frame 10 via a connecting plate 39. A suction opening 42 connected to a vacuum pump 41 as suction means is formed on the peripheral surface of the tip of the bore mold 13.

Further, the front and rear molds 15 and 16 are connected to a mold mounting plate 43 provided at each rod end of the opening / closing cylinders 17 and 18, as shown in FIG. 6, while the pair of horizontal molds 4 and 4 is connected to the horizontal cylinder 3. Each is connected to a mold mounting plate 44 provided at the end of the rod. The front and rear molds 15, 16 are provided with the ends of the skirting boards 47, 48, 49 of the water jacket core 45 shown in FIG. 7 and the crankcase core 46 shown in FIGS. 8 and 9, respectively. Baseboard insertion portions 50, 51, 52 for fitting are formed.

Therefore, the front and rear molds 15 and 16 are moved forward with respect to the bore mold 13, and the bore mold 13 is lowered relative to the fixed lower mold 2,
Furthermore, by advancing the horizontal molds 4, 4 relative to the fixed lower mold 2,
A product part space (cavity) R of the cylinder block W is defined between the molds.

As shown in FIG. 10, the core setting jig 23 includes a jig main body 53 for positioning the crankcase core 46, and the jig main body 53.
A pedestal 55 for positioning the cylinder liner 54 (see FIG. 7) and a positioning block 5 for positioning the water jacket core 45 also provided on the jig body 55.
It consists of 6,57. The one positioning block 57 is rotatably hinged to an arm 58 provided upright on the jig main body 53 through a pin 59, so that the positioning block 57 can be rotated upward from the horizontal state of FIG. 10 (A). Has become.

Next, the operation of the casting apparatus configured as described above will be described.

For example, when manufacturing the cylinder block W for the in-line four-cylinder engine shown in FIG. 4, first, the core carrier 21 and the core setting jig 23 are attached to the traverse rail 20.
With the jig 23 positioned at one end as shown in FIGS. 1 and 3, the four cast iron cylinder liners 54 and water jacket shown in FIG. Both the child 45 and the crankcase core 46 of FIGS. 8 and 9 are heated to a temperature of about 500 ° C. and positioned and mounted. That is, as shown in FIG. 2 and FIG. 10 (A), the cylinder liner 54, the water jacket core 45, and the crankcase core 46 are positioned relative to each other in the regular cast-in position of the product shape. Then, the core carrier 21 is moved to the standby station P ₂ by the operation of the rotary actuator 25, and at this P ₂ position, the cylinder liner 54 and the water jacket core 45 on which the core setting jig 23 is positioned and mounted are placed. And, together with the crankcase core 46, the lifter 19 raises it to its ascent limit position shown in phantom in FIG.

At this point, the front and rear molds 15 and 16 mounted on the mold mounting frame 10 are in the retracted position with respect to the bore mold 13 due to the operation of the lifting cylinder 9, and stand by at the lower limit position.

As a result, the bore mold 13 enters into the cylinder liner 54 and is sucked by the vacuum pump 41 from the suction opening 42 at the same time, so that each cylinder liner 54 is vacuum-sucked to the peripheral surface of the bore mold 13.

Here, since the inner peripheral surface of the cylinder liner 54 has a slope corresponding to the draft of the entry portion of the bore mold 13 as shown in FIG. 10, the cylinder liner 54 of the bore mold 13 is
While the entry into the cylinder is very smooth, when the cylinder liner 54 reaches its upper limit, the bore type 13
Due to the close contact of the cylinder liner 54 with the peripheral surface, the cylinder liner 54 is accurately positioned with respect to the bore mold 13, and the molten metal is completely prevented from being inserted between them.

Further, after waiting for the bore mold 13 and the cylinder liner 54 to be positioned, the front and rear molds 15, 16 are moved forward with respect to the bore mold 13 by the open / close cylinders 17, 18, thereby to As shown in Fig. 8 and Fig. 8, core setting jig
23. Allow the respective skirting boards 47, 48, 49 of the water jacket core 45 and the crankcase core 46 on the 23 to fully enter into the skirting board insertion portions 50, 51, 52 of the front and rear 15,16, respectively. Accurate positioning and holding of the water jacket core 45 and the crankcase core 46. Here, by supporting the water jacket core 45 at two positions of the skirting boards 47, 48, the rotational moment about the skirting board 48 is suppressed to enable more accurate positioning.

In this way, after the cylinder liner 54, the water jacket core 45 and the crankcase core 46 are positioned and held with high accuracy by the bore mold 13 and the front and rear parts 15 and 16, respectively, the core setting jig 23 is lifted. After being lowered by 19, the elevating cylinder 9 is operated to lift the mold mounting frame 10 together with the bore mold 13 and the front and rear molds 15 and 16, and further together with the cylinder liner 54 and the respective cores 45 and 46, and the traveling carriage 7 that continues. Based on the predetermined amount of running motion of
The cylinder liner 54 and the respective cores 45, 46 are accurately positioned at the pouring station P ₁ position as shown by the solid line in FIG.

At this time, as shown in FIGS. 10 (A), (B), and (C), in the process of lowering the core setting jig 23, the reference block that has been positioning and supporting the water jacket core 45 until then.
57 will interfere with the crankcase core 46 located below the water jacket core 45. However, as shown in FIGS. 7B and 7C, the movable reference block 57 that is in contact with the crankcase core 46 rotates upward and retracts as the core setting jig 23 moves downward. This avoids the above interference.

Then, the bore mold 13 and the front and rear molds 15 and 16 are gradually lowered based on the re-extending operation of the elevating cylinder 9, and they are moved to predetermined positions with respect to the fixed lower mold 2 as shown in FIGS. 2 and 5. By setting it correctly, the cylinder liner 54, the water jacket core 45, and the crankcase core 46 held by the bore mold 13 and the front and rear molds 15 and 16 can also be fixed very smoothly and with high accuracy. It is set at a predetermined position with respect to the mold 2, and then the horizontal mold 4 is moved forward with respect to the fixed lower mold 2 by the horizontal cylinder 3 so that a desired three-dimensional shape can be obtained between the respective molds as shown in FIG. A product part space R of the cylinder block having the is formed. As a result, the crankcase core 46 substantially functions as a part of the fixed lower mold 2.

Into the product space R, the molten metal in the molten metal holding furnace 5 is poured through the stalk 35, the feeder 34 and the pouring port 33. As a result, the cylinder liner 54 and the respective cores 45, 46 are casted.

Then, after the molten metal is completely solidified and becomes the required cylinder block W, the horizontal mold 4 is first retracted with respect to the fixed lower mold 2, and then the lifting cylinder 9 is used to move the upper mold 12 and the bore mold 13 to each other.
And the front and rear molds 15, 16 are lifted together with the cylinder block W as shown in FIG. 13, and then the molds 12, 13,
15, 16 and the cylinder block W are transferred to the waiting station P ₂ by the traveling carriage 7, and the elevating cylinder 9 is extended at that position to bring them to the lower limit position.

Then, at the standby station P ₂ position on the traverse rail 20, as shown in FIG.
By lifting the lifter 19 which is mounted and is standing by, the work receiving jig 24 positioned on the carriage 22 is raised to the position of the imaginary line in the figure, and the jig 24
The cylinder block W is temporarily received at. Further bore type 13
And the front and rear dies 15, 16 (not shown) are also moved backward, and in this state, the ejector pin 38 is projected from the upper die 12 by the operation of the product extruding cylinder 40, whereby the cylinder block W is moved to its bore type. Release from 13.

For such release, for example, ejector pin
By synchronizing the projecting speed of 38 and the descending speed of the workpiece receiving jig 24, damage to the cylinder block W can be prevented very effectively.

The work receiving jig 24 having received the cylinder block W in this way is repositioned on the work loading carriage 22 by the lifter 19 and then moved to one end portion of the traverse rail 20 by the carriage 22 as shown in FIG. It is transferred as shown, and the cylinder block W is delivered to the next process there.

In addition, when exchanging the respective molds in this apparatus, for example, the fixed lower mold 2 removed from the lower fixed plate 1 and the horizontal mold 4 removed from the mold mounting plate 44 are replaced by the upper mold 12, the bore mold 13, and the front and rear molds 15, It is transferred to the mold exchange station P ₃ together with 16, and then they are hung on the mold exchange carriage 32 and removed on the carriage 32, after which the upper molds of the other carriages are transferred to the metal mold. The lower mold and the horizontal mold are attached to the mold mounting frame 10 and the front and rear molds to the cylinders 17 and 18, respectively, and the lower mold and the horizontal mold are carried into the pouring station P ₁ together there, and the lower mold and the horizontal mold are respectively fixed to the lower part there. It is carried out by attaching it to the plate 1 and the horizontal cylinder 3.

As described above, according to the present invention, each of the cylinder liner, the water jacket core, and the crankcase core positioned on the jig is positioned and supported by the bore type and the front-rear type, so that The cylinder liner and the cores can also be positioned with high accuracy with respect to the fixed lower mold simply by setting the mold at a predetermined position with respect to the fixed lower mold at the pouring position. Moreover, since the cylinder liner and each core are cast while being supported by the bore mold and the front and rear molds, the final positioning accuracy of the core, etc. can be greatly improved compared to the conventional one, and the core Even though the shape is extremely complicated and unstable, it is possible to realize full automation from the setting of cores to casting.

Further, as a characteristic of the cylinder block where the skirt portion of the crankcase is not symmetrical to the left and right, the crankcase core forming a part of the lower mold must be used together, but this may occur when the crankcase core is used together. Interference between the jig and the crankcase core on the jig can be reasonably avoided by the movable positioning member, and in addition to the realization of the automatic setting of the core, etc., the core is prevented from being damaged. There are advantages.

[Brief description of drawings]

FIG. 1 is a perspective view of an essential part showing an embodiment of the casting apparatus of the present invention, FIG. 2 is a sectional explanatory view of FIG. 1, FIG. 3 is a side view of FIG. 1, and FIG. 4 is a cylinder block. Sectional drawing, FIG. 5 is an enlarged view of a main part of FIG. 2, FIG. 6 is a vertical sectional view of FIG. 5, and FIG.
Figure is a perspective view of the cylinder liner and water jacket core, Figure 8 is a perspective view of the crankcase core, Figure 9 is a plan view of Figure 8, and Figures 10 (A), (B), and (C). Is an explanatory view of the operation of the core setting jig shown in FIG. 2, FIG. 11, FIG. 12 and FIG.
FIG. 14 and FIG. 14 are operation explanatory views of the main part of FIG. 1 ... Lower fixing plate, 2 ... Fixed lower mold, 4 ... Horizontal type, 7 ... Traveling carriage, 10 ... Mold mounting frame, 12 ...
Upper mold, 13 …… Bore mold, 15 …… Front mold, 16 …… Rear mold, 23 ……
Core setting jig, 41 ... Vacuum pump as suction means,
42 …… Suction opening, 45 …… Water jacket core, 46
...... Crankcase core, 47,48,49 …… Baseboard, 50,51,52
...... Baseboard insertion part, 54 ...... Cylinder liner, 57 ...... Positioning block as positioning member, C ...... Crankcase, S ₁ , S ₂ ...... Skirt part, R ...... Product space, W ......
Cylinder block, P ₁ ... pouring station (pouring position), P ₂ ... standby station (standby position).

Claims (1)

[Claims] 1. A casting device for a cylinder block, wherein a lower end portion of one skirt portion of a crankcase is curved inward so that the skirt portion is formed asymmetrical about a plane including a cylinder bore center line, at a pouring position. A fixed lower mold fixed to a horizontal lower fixed plate, a pair of horizontal molds provided on the lower fixed plate and capable of advancing and retreating with respect to the fixed lower mold, and a standby position adjacent to the pouring position, and a cylinder. In addition to the liner and water jacket core, a jig for positioning the three crankcase cores that form part of the lower mold corresponding to the above-mentioned curved skirt, to a regular cast-girth position, and the pouring. A traveling carriage that is horizontally movable between a position and a standby position and that is equipped with a mold mounting frame that can be raised and lowered, and is mounted on the mold mounting frame. A bore type that moves up and down with respect to the fixed lower die together with the die mounting frame, and a product part that is attached to the die mounting frame and can move back and forth in the horizontal direction with respect to the bore die, together with the fixed lower die, the horizontal type, and the bore die. Front and rear molds that form a space, and a baseboard difference that is formed in the front and rear molds and that fits with the skirting boards of the water jacket core and the crankcase core to position and support the water jacket core and the crankcase core. An inlet portion, a suction opening portion formed on the peripheral surface of the bore mold and connected to a pressure reducing means for sucking and positioning and supporting the cylinder liner on the bore mold, and a water jacket core provided in the jig. Position and position the jig in a direction that avoids interference with the crankcase core depending on the vertical displacement of the die mounting frame. Avoid to movable positioning member, a casting apparatus of a cylinder block, comprising the city.