JP3541473B2 - Method and apparatus for manufacturing hollow member having rib on inner peripheral surface - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a core member for casting a hollow member having a rib, and can be used for casting a product in which a rib is formed on an inner peripheral portion of a casting such as a piston for an internal combustion engine.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in casting, it is necessary to pouring a molten metal into a cavity to cool and solidify the molten metal, and then remove the product from a mold by a product removing mechanism. As a conventional publication that discloses this type of apparatus, there is a technique disclosed in Japanese Patent Application Laid-Open No. 62-127151. In this method, a product is removed from a mold after casting by an extrusion pin penetrating the mold.
[0003]
[Problems to be solved by the invention]
Accordingly, the present invention utilizes a core for forming an undercut shape on a product to form a rib, and eliminates the need for a product removal mechanism as disclosed in the above-described prior art, thereby reducing cost. An object of the present invention is to provide a core device for casting a hollow member having a rib capable of reducing the number of steps and the number of steps.
[0004]
In order to solve the above-mentioned technical problems, the technical means adopted in the invention of claim 1 includes a fixed mold for molding at least a bottom surface of a hollow member to be cast, and a shaft of the hollow member. A movable mold that can move in a direction perpendicular to the mold and at least forms a side surface of the hollow member that is not formed by the fixed mold, a side core that forms at least the inner peripheral surface of the hollow member, and a side member that is located between the side cores when the hollow member is formed. The molten metal is poured into the cavity formed by the center core movable in the axial direction of the hollow member, cooled and solidified, and then the movable mold is moved away from the axis of the hollow member, and then the hollow member is fixed. The center core and the side core are simultaneously moved in the direction of removing the mold from the mold, and only the center core is moved in the direction of removing the hollow member from the fixed mold. In a direction approaching the heart from moving the side core, is to move the side core in a direction pulled out of the hollow member from the stationary die.
[0005]
The technical measures taken in the invention of claim 2 are a fixed mold for molding at least the bottom surface of the hollow member to be cast, and a hollow member movable in a direction perpendicular to the axis of the hollow member and at least not molded with the fixed mold. A movable mold for molding the side surface, a side core for molding the inner peripheral surface of at least the hollow member, and a center core that is located between the side cores and is movable in the axial direction of the hollow member when molding the hollow member, and after the molding of the hollow member, The movable die is moved in a direction away from the axis of the hollow member, then the center core and the side core are simultaneously moved in a direction in which the hollow member is pulled out of the fixed die, and the center core is moved in a direction in which the hollow member is pulled out of the fixed die. , A core removing drive that moves the side core in a direction approaching the axis of the hollow member, and further moves the side core in a direction that removes the hollow member from the fixed mold. Is that and a location.
[0006]
In order to easily remove the hollow member from the fixed mold with a simple configuration, a technical measure taken in the invention of claim 3 is that the core removing drive device moves the center core to a side where the hollow member is removed from the fixed mold . In this case, a link mechanism for moving the side core in a direction approaching the axis of the hollow member, and an operation delay means for operating the link mechanism after moving the hollow member after casting along with the movement of the side core, are provided. That is the feature.
[0007]
[Action]
According to the first aspect of the present invention, after the molten metal is poured into the cavity, cooled and solidified, the movable core is moved in a direction away from the axis of the hollow member.
[0008]
Thereafter, when the center core and the side core are simultaneously moved in a direction in which the hollow member is removed from the fixed mold, the hollow member is removed from the fixed mold because the side core is hooked on the rib. When the center core is moved in a direction in which the hollow member is removed from the fixed mold, each side core can move in the axial direction of the hollow member by the width of the center core, and the side core is moved to the axial center of the hollow member. After moving in the approaching direction, the side core is moved in a direction to pull out the hollow member from the fixed mold. Thus, the hollow member is removed from the fixed mold after being formed in the cavity.
[0009]
According to the second aspect of the invention, the hollow member is formed by a fixed mold, a movable mold, a side core, and a center core.
[0010]
After molding, the movable mold is moved in a direction away from the axis of the hollow member. Thereafter, the coring driving device simultaneously moves the center core and the side core in a direction in which the hollow member is removed from the fixed state. Thereby, since each side core is hooked on the rib of the hollow member, the hollow member is removed from the fixed mold. When the center core is moved in a direction in which the hollow member is removed from the fixed mold, each side core can move in the axial direction of the hollow member by the width of the center core, and the side core is moved to the axial center of the hollow member. After being moved in the approaching direction, the side core is moved in a direction in which the hollow member is removed from the fixed state. Thus, the hollow member is removed from the fixed mold after being formed in the cavity.
[0011]
According to the third aspect of the present invention, since the link mechanism is operated after the hollow member after casting is slid in the removing direction by the operation delaying means, the state in which the side core is engaged with the rib of the hollow member. The hollow member is pulled out of the fixed mold. Thereafter, the center core and the side core are removed in this order by the link mechanism as described above.
[0012]
【Example】
An embodiment according to the present invention will be described with reference to the drawings.
[0013]
1 to 4 show a die casting machine employing a core member for casting a hollow member having a rib according to the present embodiment.
[0014]
The base 10 is provided with a fixed die 12 for molding the vicinity of the top of a piston 11 for an internal combustion engine, which is a product, in the center. Further, a molten metal channel 13 for pouring the molten metal into the cavity is formed.
[0015]
On the base 10, movable dies 14, 15 for forming the outer peripheral surface of the piston 11 are arranged so as to be movable in a direction perpendicular to the axis of the piston 11 (that is, in the horizontal direction in the figure). The movable dies 14 and 15 are connected to driving sources of the movable dies 14 and 15 via engagement members 16 and 17, respectively. Reference numeral 18 denotes a rod driven by a driving source (not shown). As the driving source, for example, a hydraulic cylinder or a motor that reciprocates by controlling the hydraulic pressure may be used.
[0016]
A center core 20 movable in the axial direction of the piston 11 and side cores 21 and 22 for forming a rib 11 a on the inner peripheral surface of the piston 11 are provided in a hollow portion of the piston 11.
[0017]
The center core 20 is engaged with a link operation timing member 23 through which link operation rods 29 and 30 to be described later are vertically movably penetrated, and the link operation timing member 23 further includes engagement members 24 and 25. , 26 via a driving source 27 (for example, a hydraulic cylinder, a motor, or the like).
[0018]
The side cores 21 and 22 are connected to one end of a V-shaped link mechanism R. On the other hand, the other end of the link mechanism is connected to the slide holder 28, and the center is connected to the vicinity of the lower ends of the link operating rods 29 and 30 described above. Further, oblique slide guides 21a and 22a are interposed between the side cores 21 and 22 and the link operation rods 29 and 30.
[0019]
The link operating rods 29, 30 are small-diameter portions 29a, 30a loosely inserted into holes 28c provided in the slide holder 28, and one ends of springs 31, 32 for urging the link operating rods 29, 30 downward in the figure. And flange portions 29b and 30b for holding
[0020]
The slide holder 28 includes a lower member 28a fitted to the protruding portions 14a, 15a provided on the movable dies 14, 15, an upper member 28b having the hole 28c described above, And a coupling member 28d for guiding the reciprocating movement of.
[0021]
The upper member 28b of the slide holder and the link operation timing member 23 are connected by a link r which constitutes one of the operation delay means. A roller 33 is rotatably attached to the center of the link r. The roller 33 is fixed to the pillar members 10a and 10b of the die casting machine by bolts (not shown) and constitutes one of the operation delay means. The cams 34, 35 roll on the cam surfaces 34a, 35a.
[0022]
The coring driving device includes a link mechanism R, a link r serving as operation delay means, and cam members 34 and 35.
[0023]
Next, the operation of the present embodiment will be described.
[0024]
At the time of molding (the state of FIG. 1), for example, molten aluminum is poured from a channel 13 formed in the base 10, and a piston 11 conforming to the shape of the cavity is formed in the cavity.
[0025]
When the piston 11 cools and hardens, the movable dies 14, 15 are first driven in the opening direction as shown in FIG. Next, when the drive source 27 is operated, the link operation timing member 23 attempts to move upward in the figure, but the roller 33 located at the center of the link r is moved in the left and right directions in the figure by the cam surfaces 34a and 35a. Since the link operation timing member 23 is regulated so as not to spread, the force for the link operation timing member 23 to move upward is transmitted to the slide holder 28 and further transmitted to the side cores 21 and 22. Thereby, the rib 11a of the piston 11 is detached from the fixed mold 12 while being hooked on the side cores 21 and 22.
[0026]
Thereafter, when the roller 33 is movable in the left and right directions in the figure along the cam surfaces 34a and 35a, the angle formed by the two members of the link r becomes narrower, and the link operation timing member 23 becomes the link operation rod 29, 30 will move up.
[0027]
That is, only the center core 20 is pulled upward in the drawing.
[0028]
Next, when the link operation timing member 23 contacts the flange portions 29b, 30b of the link operation rod and the link operation rods 29, 30 move upward against the urging force of the springs 31, 32, the center of the link mechanism R is moved. The portion is pushed up in the figure, and the V-shaped link mechanism R is deformed into a single character. Thereby, the side cores 21 and 22 are moved obliquely upward along the oblique slide guides 21a and 22a, respectively. Thereby, the side cores 21 and 22 come off from the piston 11.
[0029]
Then, when the link operation timing member 23 is further moved upward, the side cores 21 and 22 come off from the piston 11.
[0030]
In the present embodiment, the side cores 21 and 22 forming the ribs 11a of the piston are used to pull out the piston 11 from the fixed mold while being hooked, thereby eliminating the need for a product take-out device as in the prior art. Therefore, cost reduction and man-hour reduction can be achieved.
[0031]
Further, in this embodiment, the hollow member is easily removed from the fixed mold 12 with a simple configuration by delaying the operation of the link mechanism R by the link r and the cam members 34 and 35 constituting the operation delay means. be able to.
[0032]
Further, in the present embodiment, the end portions (lower end portions in the figure) of the side cores 21 and 22 are used to displace the side cores 21 and 22 from the piston 11 by using the oblique slide guides 21a and 22a to move the side cores 21 and 22 obliquely upward. Prevents the side cores 21 and 22 from being damaged due to interference with the inner peripheral surface of the piston 11.
[0033]
【The invention's effect】
According to the first and second aspects of the present invention, since the hollow member is pulled out of the fixed mold by the side core forming the rib of the hollow member in a state where the hollow member is hooked, the product is taken out as in the prior art. The device can be made unnecessary, and cost reduction and man-hour reduction can be achieved.
[0034]
According to the third aspect of the present invention, by delaying the operation of the link mechanism by the operation delay device, the hollow member can be easily removed from the fixed mold with a simple configuration.
[Brief description of the drawings]
FIG. 1 is a front view of a die casting machine employing a core member for casting a hollow member having a rib according to the present invention, showing a state at the time of molding.
FIG. 2 is a front view of a die casting machine employing a hollow member casting core device having a rib according to the present invention, showing a state where the hollow member is removed from a fixed mold.
FIG. 3 is a front view of a die casting machine employing a core member for casting a hollow member having a rib according to the present invention, showing a state in which a center core has been removed and side cores have been moved obliquely upward. .
FIG. 4 is a front view of a die casting machine employing a hollow member casting core device having a rib according to the present invention, showing a state after a center core and a side core have been removed.
[Explanation of symbols]
11 ... piston for internal combustion engine (hollow member)
11a Rib 12 Fixed mold 14, 15 Movable mold 20 Center core 21, 22 Side core 34, 35 Cam member (operation delay means)
34a, 35a ... cam surface R ... link mechanism r ... link (operation delay means)

Claims (3)

A fixed mold that molds at least the bottom surface of the hollow member to be cast, a movable mold that can move in a direction perpendicular to the axis of the hollow member, and molds a side surface of the hollow member that is not molded with at least the fixed mold; The molten metal is poured into a cavity formed by a side core that forms the inner peripheral surface of the hollow member, and a center core that is located between the side cores and that is movable in the axial direction of the hollow member when the hollow member is formed, and is cooled. After hardening, the movable die is moved in a direction away from the axis of the hollow member, and then the center core and the side core are simultaneously moved in a direction in which the hollow member is removed from the fixed die, and the hollow member is moved. Only the center core is moved in a direction to pull out from the fixed mold, and further, the side core is moved in a direction approaching the axis of the hollow member. It was allowed to dynamic method of hollow members having a rib on an inner peripheral surface, characterized in that moving the side core in a direction pulled out of the hollow member from the fixed mold. A fixed mold that molds at least the bottom surface of the hollow member to be cast, a movable mold that can move in a direction perpendicular to the axis of the hollow member, and molds a side surface of the hollow member that is not molded with at least the fixed mold; A side core that forms the inner peripheral surface of the hollow member, a center core that is located between the side cores when the hollow member is formed and that can move in the axial direction of the hollow member, and a shaft of the hollow member after the hollow member is formed. Moving the movable die in a direction away from the center, and then simultaneously moving the center core and the side core in a direction to pull out the hollow member from the fixed die, and moving the center core in a direction to pull out the hollow member from the fixed die. And moving the side core in a direction approaching the axis of the hollow member, and further removing the hollow member from the fixed mold. Apparatus for producing a hollow member having inner having a rib on the peripheral surface, characterized in that a cored driving device for moving the side core in the direction. The core removing drive device includes a link mechanism that moves the side core in a direction approaching the axis of the hollow member when the center core is moved to a side where the hollow member is removed from a fixed mold, and the hollow member after casting. 3. The casting of a hollow member having a rib on the inner peripheral surface according to claim 2, further comprising operation delay means for operating the link mechanism after moving the link member along with the movement of the side core. apparatus.

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