JPH054916Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a core-making die having a loose piece that is horizontally movable relative to the upper and lower dies.

[Prior Art] As shown in Fig. 2, a core molding apparatus is well known in which a core is molded by heating and hardening molding sand blown into a cavity C of a mold M from a blow head BH. ing.

In this type of core molding apparatus, if the shape of the core to be molded is complex, for example, if the core has a part called an undercut, even if the upper and lower molds UM and LM are separated after molding, Since it is not possible to stick out the core and collect it as it is, for example, by making a part of the lower mold LM into a horizontally movable split SM, and retracting this split SM in the horizontal direction, the core can be removed. A multi-segment core molding device that can be ejected is used (see, for example, Japanese Utility Model Application Publication No. 57-44659).

In such a multi-segmented core molding device, a cylinder device is used to drive each of the pair of segmented SMs.
It is necessary to provide a CY, which makes the entire device complicated and large, which poses problems such as requiring a large installation space.

[Purpose of the invention] The present invention has been made in view of the above-mentioned conventional problems, and it simplifies the drive mechanism of a loose piece, which is a type of split type, and eliminates the need for a cylinder device. The purpose of the present invention is to provide a core molding die that can be made compact and inexpensive as a whole.

[Structure of the invention] For this reason, the present invention uses a core ejection mechanism provided on the lower mold side to eject the molded core after molding, and provides a rod parallel to the eject pin to eject the molded core. The basic feature is that the rod is linked with the loose piece, and the loose piece is retracted by operating this rod by the ejecting mechanism before ejecting the core.

[Effects of the invention] According to the invention, since the core ejection mechanism is used to operate the loose piece, the cylinder device for driving the loose piece can be omitted, and the entire molding apparatus can be made compact. It can be made into a structure that is advantageous in terms of cost.

Further, since the rod connected to the loose piece moves the loose piece backward before the eject pin of the core is ejected, the core can be taken out smoothly without any special control.

[Example] Hereinafter, an example of the present invention will be specifically described based on the drawings.

As shown in FIG. 1, the mold 1 includes an upper mold 3 held in an upper mold frame 2 and a lower mold 5 held in a lower mold frame 4.
A loose piece 7 for forming an undercut portion 6a of a core 6 to be molded is fitted and held in the lower die 5 so as to be movable in the horizontal direction.

As mentioned above, coated resin sand is inserted into the cavity 8 defined by the upper mold 3, the lower mold 5, and the loose piece 7 from the blow port 9 provided in the upper mold 2 by means of a blow head (not shown). The molding sand (molding sand) is blown into the mold, and the blown molding sand is gradually hardened by heating, and the core 6 is finally molded.

For this core 6, eject plate 1
1, an eject pin 12 is provided so as to come into contact with the lower surface of the core through the lower formwork 4 and the lower mold 5, and when the upper mold 3 is retracted upward, the eject plate 13 on the machine side is the eject plate 1 via the receiving jig 14.
By pushing up the core 6, the molded core 6 can be ejected using the eject pin 12 and taken out.

As shown in FIG. 1, the eject plate 11 is provided with a rod 15 for operating the loose piece 7 parallel to the eject pin 12, in other words, vertically upward. At the lower end of this rod 15, there is a collar 15a that serves as a downward stopper;
A spring receiving ring 15b is provided which receives the lower end of the auxiliary spring 16 for pulling down the rod, and the rod 15 can be displaced relative to the eject plate 11 between these rings. Further, the lowermost end 15e of this rod 15 is connected to the stopper collar 1.
At the lowered position where 5a is in contact with the eject plate 11, the receiving jig 1 of the eject plate 11 is
In other words, when the machine-side eject plate 13 rises, it first contacts the rod 15 and raises the rod 15 by a predetermined amount a. After that, the eject plate 1 comes into contact with the receiving jig 14.
1 and remove the core 6 using the eject pin 12.
The structure is such that the ejecting operation is performed. The rod 15 passes through the lower formwork 4 and extends upward through a guide tube 17 fixed to the side wall of the lower formwork 5, and the uppermost end 15t is connected to the upper formwork 2.
Rod push pin 1 fixed vertically downward from
It comes into contact with the lower end of 8 and is pressed down,
In the state where the molds are matched, the height is set so that the apex is located at the upper and lower mold dividing plane L.

On the other hand, on the back side of the loose piece 7, an interlocking rod 19 extending horizontally backward from the back side of the stopper flange portion 7a is provided in the axial direction of the loose piece 7, and its free end is connected to the side wall of the lower formwork 4. It is slidably fitted into a guide tube 20 provided in the. Approximately in the center of the rear half of this interlocking rod 19,
An interlocking pin 21 is fixed horizontally, and the tip of this interlocking pin 21 is connected to an angled linking lever 2.
It is slidably fitted into a long groove 23 provided in one of the lever parts 22a of 2. The above link lever 22
is rotatably supported at the corner by a hinge shaft 25 horizontally attached to a support 24 erected inside the lower formwork 4, and the tip of the other lever part 22b is rounded in an arc shape. The rod 15 is fitted into a cutout 26 having an arcuate cross section, which is provided in advance in the rod 15.

In addition, in the guide tube 20 of the interlocking rod 19, an auxiliary extrusion spring 27 is compressed, and in order to protect mechanisms such as the interlocking lever 22 from sand, the upper end of the side wall of the lower mold 4 and the side wall of the lower mold 5 are installed. A rod 1 for allowing displacement of the rod 15 between the upper end and the upper end.
A cover 28 is provided which has a punched opening with a diameter slightly larger than the outer diameter of 5.

Further, the rod 15 is prevented from rotating by a rotation stop 29 provided on the lower surface of the lower formwork 4.

Next, the operation of the core molding apparatus having the above configuration will be explained.

The state shown in FIG. 1 is the state during core molding, in which the rod 15 is pushed down to the lowest position by the rod push-down pin 18, and the link lever 22 is pushed down to the lowest position.
The other lever portion 22b, which fits into the notch 25 of the rod 15, is held in a depressed state around the counterclockwise hand. An interlocking rod 19 interlocks with the interlocking lever 22 via an interlocking pin 21.
, attach the loose piece 7 to its stopper flange 7a.
is held in contact with the lower mold 5, and the loose piece 7 is held in the molding position.

Although FIG. 1 shows the drive mechanism only for the loose piece 7 on the right side, it goes without saying that a similar drive mechanism is provided for the loose piece 7 on the left side.

When the molding of the core 6 is completed, the upper formwork 2
is raised and the upper die 3 is retracted to a position where there is no problem in taking out the core 6, and then the machine side eject plate 13 is driven upward.

As mentioned above, this machine side eject plate 13 first touches the lower end 1 of the rod 15 during the ascent process.
5e and supports the eject pin 12, the rod 15
only by a predetermined amount a. Therefore, the linking lever 22 is rotated around the hinge shaft 25 around the hour hand by an angle corresponding to a predetermined amount a, and the linking rod 19 is rotated to the right in the figure via the linking pin 21 fitted in the long groove 23. That is, the loose piece 7 is displaced in the backward direction and pulled back to a position where there is no problem in taking out the core 6.

During this time, the machine-side eject plate 13, which continues to rise, comes into contact with the receiving jig 14 of the eject plate 11 at the timing when the loose piece 7 is retreated, and thereafter pushes up the eject pin 12 to move the core 6 to the lower mold 5. The protruding core 6 is carried out to the next process by a handling means (not shown).

During this time, rod 15 is also raised, but rod 1
5 has risen to a certain extent, the link lever 22
The lever portion 22b of the rod 15 is disengaged from the notch 26 of the rod 15, and the interlocking rod 19, and therefore the loose piece 7, are not moved back more than necessary.

When one molding is completed as described above,
The upper formwork 2 is lowered again to the state shown in FIG. 1, and the next molding will be performed.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of a core molding apparatus according to an embodiment of the present invention, and FIG. 2 is a side view of a conventional core molding apparatus. 3... Upper mold, 5... Lower mold, 6... Core, 7...
Loose piece, 11...Eject plate, 1
2... Eject pin, 13... Machine side eject plate, 15... Rod, 19... Interlocking rod, 21... Interlocking pin, 22... Interlocking lever.

Claims (1)

[Scope of utility model registration request] The molds 3 and 5 are divided into upper and lower parts, a loose piece 7 that is horizontally movable and forms part of the cavity 8 in the mold, and a core provided on the lower mold 5 side after molding. 6, and a movable plate 13 disposed below the eject pin 12 to protrude and operate the eject pin 12. An interlocking member 19 that can move horizontally is provided integrally with the ejector, and a rod member 15 that can be moved up and down parallel to the eject pin 12 by the movable plate 13 is provided on the side of the interlocking member 19. and the interlocking member 19 are interconnected by an interlocking lever 22 which converts the vertical upward movement of the rod member 15 into a horizontal movement of the interlocking member 19 and moves the loose piece 7 backward. The rod member 15 includes an engaging portion 26 that engages with the linking lever 22, and a movable plate 13 when the movable plate 13 is raised.
3 is provided with a contact portion 15e that comes into contact with the eject pin 12 prior to the eject pin 12.