JPH0679760B2 - Core moving device for casting machine - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a casting machine having a core in a mold, and in particular, a rod-shaped core is cantilevered at one axial end thereof to move in the axial direction. By doing so, the present invention relates to a core moving device for a casting machine that is attached to and detached from a mold.

(Prior Art) As a conventional technology, a cylinder that reciprocally moves a rod-shaped core in the axial direction is positioned firmly outside the mold,
By firmly cantilevering one axial outer end of the core to the tip of the operating rod of this cylinder, and by expanding and contracting the operating rod, the core is inserted and removed from the outside of the mold. It was a structure that does.

(Problems to be Solved by the Invention) In the above-mentioned conventional one, since the core is positioned at a predetermined position in the mold on the cylinder side which is separate from the mold, the position of the core with respect to the mold is likely to be misaligned. In addition, there is a drawback that the positioning adjustment is troublesome. Furthermore, when the core is pulled out from the mold after molding, the cylinder on the drive source side is apt to be biased with respect to the mold (frame) due to a large load, which causes damage to the core when removing the core from the mold after molding. However, there are drawbacks such as overloading the cylinder.

It is an object of the present invention to obtain a novel core moving device for a casting machine, which solves the above drawbacks.

(Means for Solving the Problems) In order to achieve the above object, the present invention is
A tapered locking hole that penetrates from the outside toward the cavity is provided, and a tapered locking portion that closely fits the locking hole at one axial outer end of the rod-shaped core. And an operating mechanism for reciprocating the core in parallel with the core, and the operating mechanism and the outer end of the locking portion,
The configuration is such that the dovetail-shaped connecting portion is swingably connected.

(Operation) Since the present invention has the above-described configuration, the locking hole is always accurately positioned at a predetermined position of the cavity regardless of the mounting accuracy of the operating mechanism. Then, when the core is moved in the mold direction by the operating mechanism, the locking portion at the axially outer end of the core is pressed and locked in the locking hole of the mold, and the core is accurately positioned with respect to the mold. Will be done.

Further, a slight mounting error of the actuating mechanism or a deviation at the time of actuation causes the connecting portion between the actuating mechanism and the core to swing and absorb it.

(Example) Hereinafter, the Example of this invention is described based on drawing.

First, in the drawings, FIG. 1 is a cross-sectional view of a main part of a casting machine to which the present invention is applied, and FIGS. 2 and 3 are II-II and I thereof.
It is a II-III sectional view.

In FIG. 1, reference numeral 1 is a base fixed to a base, and a mold 2 made of a metal mold is placed and fixed on the base 1.

The mold 2 has a cavity 5 between an upper mold 3 and a lower mold 4 which are horizontally divided. In this cavity 5, two cylindrical cores 6 made of a metallic material are arranged so as to extend horizontally (left and right).

The core 6 is cantilevered by the right wall of the lower mold 4.

That is, the right wall of the lower mold 4 is extended upward to form the core holding wall 4a, and the core 5 is formed on the core holding wall 4a from the outside of the mold 2.
A through hole 4b penetrating in the horizontal direction is opened, and a tubular bush 7 is fitted and fixed in the through hole 4b.

The bush 7 has a locking hole 7a formed in its axial center portion, which is a tapered hole having a small diameter on the cavity 5 side.

On the other hand, the above-mentioned core 6 has a locking portion 6a at the right end thereof, which serves as a taper shaft having a large diameter and a small diameter on the cavity 5 side.

Then, the core 6 is fitted into the cavity 5 from the bush 7 side, and the locking portion 6a at the right end of the core 6 is locked in the locking hole of the bush 7.
The core 6 is cantilevered by the core holding wall 4a of the lower mold 4 at the right end portion thereof by finely taperingly fitting the core 7a.

Reference numeral 10 denotes an operating mechanism for inserting / removing the core 6 into / from the mold 2, which has the following structure.

That is, the cylinder 11 is arranged in parallel with the core 6 at the lower part of the base 1 so as to extend in the left-right direction and locked.

The cylinder 11 is an operating rod during the shortening operation.
The tip (right end) portion 11b of 11a is positioned below the locking portion 6a at the right end of the core 6, and the tip portion 11b and the locking portion 6a are connected together.
Are connected to each other by.

As shown in FIG. 3, the connecting tool 12 has grooves 13 on both sides.
An a-shaped slider 13 having a is provided, and a core connecting body 14 for connecting the locking portion 6a of the core 6 and an operating rod 11a tip portion 11b of the cylinder 11 are connected to the upper and lower portions of the slider 13. The cylinder connecting body 15 is integrally connected.

The slider 13 is slidably fitted and supported by a pair of rails 16 extending from the base 1 to the right through the grooves 13a.

As shown in FIG. 2, the core coupling body 14 has a stepped locking hole 14a at a position facing the bush 7 in which the bush 7 side has a small width and the non-bush 7 side has a wide width. Then, the stepped piece 14b formed in substantially the same shape as the locking hole 14a is loosely fitted, that is, fitted and locked by allowing a slight lateral movement and vertical movement in FIG. A groove-shaped connecting portion is formed, and a male screw 6b formed at the right end of the core 6 is screwed and connected to the left end of the locking piece 14b.

In FIG. 1, 14c is a lid that covers the upper portion of the locking hole 14a, and 14d is a set screw that locks the lid 14c on the upper surface of the core coupling body 14 via an elastic body such as a coil spring.

Further, the cylinder connecting body 15 is, as shown in FIG.
An L-shaped bracket 15a is suspended and fixed to the lower surface of the slider 13, a columnar locking piece 15b is connected to the bracket 15a, and a tip end portion 11b of an operating rod 11a is screwed to the left end portion of the locking piece 15b. I will do it.

Next, the operation mode of the above embodiment will be described.

First, in a state in which the cylinder 11 is extended from the state of FIG. 1 and the operating rod 11a is moved to the right, the male screw 6b of the core 6 is screwed into the locking piece 14b and locked with the core 6. After integrally connecting the piece 14b, the locking piece 14b is fitted into the locking hole 14a, and then the set screw 14d is operated to close the lid 14c.

Then, the core 6 is connected to the core connecting body 14 of the connecting tool 12 at its right end portion.

If the cylinder 11 is shortened in this state, the slider 13 moves leftward in FIG. 1 along the rail 16 via the cylinder connecting body 15, so that the core 6 moves leftward via the core connecting body 14. To move into the cavity 5 of the mold 2.

In this case, in the core 6 fitted in the cavity 5, the locking portion 6a at the right end of the core 6 is pressed by the locking hole 7a of the bush 7 from the right side to be taper-fitted, and the core 6 is coaxial with the bush 7. It will be positioned.

Further, even if the mold 2 is stretched or warped due to heat, the positioning portion of the core is provided integrally with the mold, the positioning is the same, and the engaging hook 14b that engages with the core coupling body 14 is provided. Is loosely fitted in the locking hole 14a and is allowed to swing slightly, so that it is coaxially positioned by taper fitting.

In this state, molten metal, for example, a molten metal made of an aluminum alloy is injected into the cavity 5. Then, after the molten metal is solidified, if the cylinder 11 is extended, the connecting tool
The core 6 moves to the right through 12 and is separated from the mold 2.

In this case, since the locking piece 14b of the core coupling body 14 is loosely fitted in the locking hole 14a with which the core coupling body 14 engages, and a slight swing is allowed, the coupling tool 12 may be removed due to a large pull-out stress. Even if it is slightly displaced with respect to the rail 16, the core 6 is replaced by the bush 7.
It will be pulled out smoothly without being twisted.

Further, since the cylinder 11 is arranged in parallel with the core 6 and hence with respect to the mold 2, the cylinder 11 does not largely project to the outside of the mold 2.

(Effect of the invention) As is apparent from the above description, according to the present invention, a locking hole is integrally provided on the die side, and the locking hole is closely fitted on the axially outer end side of the core. Since the core is made to reciprocate in the axial direction by an operating mechanism that is provided with a portion and is swingably connected to the locking portion via a connecting portion, it is necessary to position the core in a correct position in the cavity. In addition, the core can be smoothly moved in the axial direction without being damaged.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a casting machine to which the present invention is applied,
FIG. 3 and FIG. 3 are II-II and III-III sectional views thereof. 1: Base, 2: Mold, 3: Upper mold, 4: Lower mold, 4a: Core holding wall, 5:
Cavity, 6: Core, 6a: Locking part, 6b: Male thread, 7: Bushing, 7a: Locking hole, 10: Actuating mechanism, 11: Cylinder, 11a: Actuating rod, 11b: Tip part, 12: Connection Tools, 13: slider, 14: core connecting body, 14a: locking hole, 14b: locking piece, 14c: lid, 14d: set screw, 15: cylinder connecting body, 15a: bracket, 15b: locking piece, 16: Rail.

Claims (1)

[Claims] 1. A taper-shaped locking hole penetrating from the outside toward a cavity is provided on one end side of a mold, and the locking hole is formed on one axial outer end of a rod-shaped core. A taper-shaped locking portion that closely fits is provided, an operating mechanism that reciprocally moves the core in parallel with the core is provided, and the operating mechanism and the outer end portion of the locking portion are dovetail-shaped. A core moving device for a casting machine, which is swingably connected by a connecting part.