JP2772844B2 - Raw sand core molding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) A preform formed by blowing green sand into a cavity defined by a first upper mold and a lower mold is formed by the lower mold and the first mold. The present invention relates to an improvement in an apparatus for forming a green sand core by compressing with a second upper mold.

(Prior Art) Conventionally, as an apparatus for molding a core using fresh sand, there is one disclosed in Japanese Patent Application Laid-Open No. 63-72449. In this device, first and second lifting tables are arranged side by side, and the first and second lifting tables are arranged.
A lower die is disposed at each position directly above the elevating table so as to be able to enter and exit alternately, and at a position directly above the lower die and directly above the first elevating table, a fresh sand blown with a first upper die attached to a lower part. And a second upper die is provided at a position directly above the second lifting table above the lower die.
The preformed body molded by blowing green sand into the cavity defined by the upper mold and the lower mold is compressed by the lower mold and the second upper mold, and the high portion of the green sand core is removed. The large and low-height portions are compressed small, that is, the compression ratio of the green sand is made substantially the same as a whole, so that the density of the green sand core can be made uniform throughout.

(Problems to be Solved by the Invention) However, in the device configured as described above, since the second upper die is located immediately above the second lifting table, the molded green sand core is removed from the lower die. When the lower mold is replaced, the second upper mold becomes a hindrance, and there are problems such as extremely low productivity and workability.

The present invention has been made to solve the above problem.

(Means for Solving the Problems) In order to achieve the above object, in a green sand core molding apparatus of the present invention, first and second elevating means are arranged side by side at a required interval from each other, and A lower die is disposed between the positions directly above the second elevating means so as to be able to alternately enter and leave via a transfer means, and a position above the lower die directly above the first elevating table is provided with the first die. The fresh sand blowing means attached to the first lower mold and the second lower mold, which are arranged in a direction orthogonal to the direction in which the second elevating means are arranged and are capable of reciprocating horizontally, are provided so as to be able to enter alternately. It is assumed that.

(Operation) In the green sand core molding apparatus configured as described above, the lower mold is raised via the first lifting / lowering means to match the first upper mold, and the first upper mold and the lower mold are defined. Green sand is blown into the cavity to form a green sand preform, and after the completion of the green sand blowing, the lower mold on which the preform is placed is lowered via the first elevating means, and then the first upper die And the second upper die is moved backward from the position immediately above the first elevating means and the second upper die is moved into the position immediately above the first elevating means. Next, the lower mold on which the preform is placed is raised again via the first elevating means, and the preform is compressed by the second upper mold and the lower mold to form a green sand core, and the compression of the green sand is completed. Thereafter, the lower mold on which the green sand core is placed is lowered via the first elevating means, and then the lower mold on which the green sand core is placed is conveyed to a position immediately above the second elevating means via the conveying means. . Next, the second lifting means is raised to push up the green sand core from the lower mold via the core pushing mechanism. After removing the pushed-up green sand core, the second lifting means is lowered, and the lower die is returned to a position immediately above the first lifting means via the transport means. on the other hand,
The lower mold is replaced after the lower mold is conveyed to a position immediately above the second elevating means via the conveying means to open the position immediately above the lower mold.

(Example) An example will be described with reference to the drawings. As shown in FIG. 1, a lower mold (5) to be described later is provided at a central portion on the base (1).
A turntable (3) as a conveying means is supported at a central portion by a driving mechanism (4) and is disposed so as to be able to intermittently rotate 180 degrees horizontally. Two turntables are provided on both left and right sides of the turntable (3). Lower dies (5) and (5) are mounted so as to be able to be pushed up, and each lower mold (5) is provided with a core pushing up mechanism (6) (see FIG. 2). At the right side position on the base (1), an elevating table (7) as first elevating means for pushing up the lower die (5) on the turntable (3) is provided via an upward cylinder (8). At the left side position on the base (1), as a second elevating means for raising and lowering the core lifting mechanism (6) of the lower die (5) on the turntable (3). Lifting lots (9) (9)
Are arranged so as to be able to move up and down via an upward cylinder (10) (see FIG. 3), and the lifting lots (9) and (9) and the lifting table (7) are connected to the drive mechanism (4). ) Are arranged symmetrically with respect to the center of symmetry.

In addition, pillars (11) and (11) are provided at the four corners on the base (1).
A ceiling frame (12) is installed between the upper ends of the columns (11) and (11). On the lower surface of the ceiling frame (12), just above the lifting table (7), a lifting table (7) and a lifting lot (9) (9)
A roller conveyor (13) with a brim extending in a direction perpendicular to the direction in which the rollers are arranged is mounted via a bracket (14), and the roller conveyor (13) with a brim is provided with a first upper die at a lower portion as shown in FIG. Fresh sand blowing means with (15) attached (16)
And a traveling platform (18) to which a second upper die (17) is attached at a lower portion are mounted so as to be able to travel freely. The tip of the piston lot of the horizontal cylinder (20) pivotally supported on the traveling platform (18) via the bracket (19) is connected to the fresh sand blowing means (16) via the bracket (21). The tip of a piston lot of a horizontal cylinder (23) pivotally supported on a roller conveyor (13) with a brim via a frame (22) is connected to the traveling platform (18) via a bracket (24). .

In the drawing, reference numeral (25) denotes a mechanism for inducing fresh sand to the fresh sand blowing means (16), and reference numeral (26) denotes a compressed air supply mechanism to the fresh sand blowing means (16).

Next, the operation of the device configured as described above will be described. In FIG. 2, after the green sand on the belt conveyor (not shown) is supplied to the green sand blowing means (16) through the green sand guiding mechanism (25), the cylinder (23) is contracted to operate the roller conveyor (with the collar). The traveling platform (18) is moved rightward from the position directly above the lifting table (7) via 13), and the fresh sand blowing means (16) is moved into the position immediately above the lifting table (7). The lower die (5) is pushed up from above the turntable (3) with the lifting table (7) to extend the cylinder (8), and a cavity for a preform is formed in accordance with the first upper die (15). The fresh sand blowing means (16) is connected to the compressed air supply mechanism (26).

Then, compressed air is supplied to the green sand blowing means (16) through the compressed air supply mechanism (26) to blow the green sand of the green sand blowing means (16) into the cavity and preform green sand. After the molding of the body and the completion of the blowing of the raw sand, the lifting table (7) is lowered by the contraction operation of the cylinder (8), and the lower mold (5) on which the preformed body is placed is lowered to turn on the turntable (3). Put on. Next, the cylinder (23) is extended to move the fresh sand blowing mechanism (16) to the left from the position immediately above the elevating table (7) and to move the second upper die (17) to the elevating table (7). The cylinder (8)
To extend the lower mold (5) on which the preform is placed, and compress the preform together with the second upper mold (17),
As a result, the preform is compressed so that the compression ratio becomes substantially the same as a whole, and a green sand core is formed. Next, the cylinder (8) is contracted to lower the lower mold (5) on which the raw sand core is placed and put it on the turntable (3), and then the drive mechanism (4) drives the turntable (3). )
Is rotated 180 degrees horizontally, and the lower mold with raw sand core (5)
Is rotated from a position directly above the lifting table (7) to a position immediately above the lifting rods (9) and (9), and the empty lower die (5) is moved to a position directly above the lifting rods (9) and (9). From above to the position immediately above the lifting table (7). Next, the elevating rods (9) and (9) are raised by the extension operation of the cylinder (10) to push up the green sand core on the lower mold (5) via the core lifting mechanism (6). After removing the sand core, the lifting rods (9) and (9) are lowered by the contraction operation of the cylinder (10), thereby completing one cycle.

The fresh sand blowing means (16) is supplied with fresh sand when it is moved to a position immediately below the fresh sand guiding mechanism (25). In addition, fresh sand blowing means (16) by the expansion and contraction operation of the cylinder (20)
Is moved independently of the traveling platform (18) as appropriate to replace the first upper die (15), clean the work, and blow fresh sand (1).
The cleaning work of 6) can be easily performed.

In the above-described embodiment, the transfer of the lower mold (5) between the position directly above the lifting table (7) and the position directly above the lifting rods (9) and (9) is performed by an appropriate transfer such as a turntable conveyor. The same operation and effect can be obtained by performing the operation by means. The lifting rods (9) and (9) may be lifting tables.

(Effects of the Invention) As is clear from the above description, the present invention provides the first and second elevating means at a required interval from each other,
A lower die is disposed between the positions directly above the second lifting / lowering means via a transfer means so as to be able to alternately enter and leave the first die.
At the position directly above the elevating table, a fresh sand blowing means and a second lower mold attached to a first lower die which are arranged in a direction orthogonal to the direction in which the first and second elevating means are arranged and which are horizontally reciprocable. Are provided so that they can enter alternately, so that the raw sand core on the lower mold can be taken out at a position above the second elevating means whose upper part is open, so that the workability is good and the lower mold is removed at this location. Since it can be replaced, an excellent effect such as easy replacement of the lower mold is achieved.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS The drawings show an embodiment of the present invention, wherein FIG. 1 is a front view with no cross section, FIG. 2 is a view taken along arrows A-A of FIG. 1, and FIG. 3 is a view taken along arrows BB of FIG. It is. (3): Turntable (5): Lower die (6): Core lifting mechanism (7): First lifting / lowering means (9): Second lifting / lowering means (15): First upper die (16): Green sand Blowing means (17): 2nd upper mold

Claims (1)

(57) [Claims] 1. A pre-formed body molded by blowing green sand into a cavity defined by a first upper mold and a lower mold, and compressed by the lower mold and a second upper mold to form a green sand core. In a green sand core molding apparatus, a first elevating means (7) arranged so as to be able to move up and down, and a first elevating means (7) arranged in parallel with the first elevating means (7) at a required interval. 2 elevating means (9);
A position directly above the elevating means (7) and the second elevating means (9);
And a core push-up mechanism (6) which is arranged so as to be able to reciprocate directly above and below, and which is entirely pushed up by the first elevating means (7) and operated by the second elevating means (9). Transport means (3) for reciprocating the lower mold (5) between a lower mold (5) and a position immediately above the first elevating means (7) and a position immediately above the second elevating means (9); ), And reciprocate in a direction orthogonal to the direction in which the first elevating means (7) and the second elevating means (9) are lined up, and the first elevating means (7) above the lower mold (5) is reciprocated. A fresh sand blowing means (16) having a first upper die (15) attached to the lower surface thereof, which is provided so as to be able to enter and exit immediately above the housing, and reciprocating in the same direction as the fresh sand blowing means (16). The first above the lower mold (5)
A green sand core molding apparatus, comprising: a second upper die (17) disposed at a position immediately above the lifting / lowering means (7) so as to be able to enter and exit.