JPH0536142B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a mold matching method in which molds made of green sand are stacked in three stages to form a completed mold.

(Prior technology) Generally, large-sized assembled molds used molds using organic binders, but recently, molds made from green sand have been put into practical use by stacking three tiers of molds. has been made into In order to prevent damage during transportation and to accurately position the large molds made from raw sand, the upper and lower molds are
A casting flask is attached to all of the middle and lower three molds.

(Problems to be Solved by the Invention) When installing a molding line that stacks three molds with attached flasks as described above to produce a finished mold, it requires more casting than a normal two-tiered mold manufacturing line. The required amount of frames increased by 1.5 times, and the number of ready frames, molding line length, casting flask storage space, etc. increased significantly. In addition, since the height of the mold is determined by the height of the flask used, more sand is used than the minimum amount required for casting products, making the sand processing equipment larger. .

(Means for Solving the Problems) The present invention has been made for the purpose of solving the above problems, and the means, that is, the structure of the present invention is to form a lower mold with a flask attached. on the top of the
A step of placing and matching a medium mold with a flask attached thereto, a step of removing the flask attached to the matched medium mold by removing it from the medium mold, and a step of removing the flask. The method includes the steps of: placing an upper mold with a flask on top of a middle mold;

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

A lower mold 2 attached to a casting flask 1, which is molded by a green molding machine (not shown), is placed on top of a surface plate 3. (See Figure 1A) The upper flange of the casting flask 1 is provided with pin holes 4, 4 into which positioning pins, which will be described later, are inserted, and the upper surface of the lower mold 2 is provided with a cavity that defines a casting cavity, which will be described later. Face 5
is molded.

Next, on the upper surface of the lower mold 2 attached to the flask 1, a middle mold 7 attached to the flask 6, which is molded by a green molding machine (not shown), attaches the positioning pins 9, 9 attached to the lower flange of the flask 6. They are fitted into the pin holes 4, 4, and placed and matched in an accurately positioned state.
(See FIG. 1B) In addition, a cavity surface 11 that defines a casting cavity 10 with the cavity surface 5 of the lower mold 2 is formed on the lower surface of the middle mold 7 in the embodiment, and a casting cavity to be described later is formed on the upper surface. The defining cavity surface 12 is molded, and the upper surface level of the intermediate mold 7 is set at a lower level than the upper surface level of the attached casting flask 6, so that the amount of molding sand used is kept to a minimum. There is.

Next, the attached flask 6 of the matched medium mold 7 is
The middle mold 7 is removed by removing the frame.

(See FIG. 1C) Details of the device and its operation for aligning the lower mold 2 and the middle mold 7 and for removing the flask 6 from the middle mold 7 will be described later.

Next, on the upper surface of the middle mold 7, an upper mold 14 attached to a casting flask 13 is molded by a raw mold molding machine (not shown).
The positioning pins 15, 15 attached to the lower flange of the lower part of the casting flask 13 are fitted into the pin holes 4, 4, and the casting molds are placed and molded in an accurately positioned state. (See FIG. 1D) In this embodiment, a cavity surface 17 that defines a casting cavity 16 with the cavity surface 12 of the middle mold 7 is formed on the lower surface of the upper mold 14.

Through the above steps, the matching of the three-tiered mold is completed.
0 is connected.

Further, the device and operation for matching the lower mold 2 and the middle mold 7 and removing the flask 6 will be explained with reference to FIG. 2. A mounting plate 23 is fixed to the tip of the mounting plate 22, and on both sides of the mounting plate 23, there is a hanging member 2 having hook claws 24, 24 whose lower ends are bent inward.
5 and 25 are vertically arranged facing each other. The hook claws 24, 24 are spaced so that they can engage with the lower surface of the upper flange of the flask 6 attached to the middle mold 7.
Further, the tip of a piston rod 27 of an upward cylinder 26 is fixed to the lower surface of the center of the mounting plate 23, and the rear part of the upward cylinder 26 has an external dimension that can be fitted inside the flask 6. Extrusion plate 2
8 is fixed thereto, and an annular extrusion member 29 is attached to the periphery of the lower surface of the extrusion plate 28. The one configured in this way has hook claws 24, 24.
While the flask 6 of the middle mold 7 is locked via the upper flange, a moving cart (not shown) is moved to position the middle mold 7 above the lower mold 2. Next, the downward cylinder 21 is operated to slowly lower the middle mold 7, and the middle mold 7 is placed on top of the lower mold 2, and the molds are matched. At this time, the positioning pin 9 of the flask 6,
9 are fitted into the pin holes 4, 4, and the middle mold 7 is accurately positioned and matched with the lower mold 2.

Next, the upward cylinder 26 operates to fit the extrusion member 29 into the flask 6 via the extrusion plate 28, and
Press the periphery of the top surface. When the downward cylinder 21 is retracted while this state continues, the middle mold 7 pushing member 29 presses the middle mold 7 in the lower mold 2 direction, and the hook claws 24 pull up the flask 6. The frame will be removed. When the flask 6 is completely removed, the upward cylinder 26 is operated in reverse to lift the extrusion plate 28 above the flask 6, and thereafter a moving cart (not shown) moves to return the flask 6 to the molding machine position. .

The above is the alignment of the lower mold 2 and the middle mold 7 and the flask removal operation of the flask 6.

In the embodiment shown in FIG. 1, there are casting cavities 10 and 10 for casting different products in the upper and lower positions of the middle mold 7, respectively.
Although the explanation has been given on a three-tier stacked mold that defines one casting cavity 30, the same process can be carried out in the case of a three-tier stacked mold that defines one casting cavity 30 as shown in FIG. be.

(Effects of the Invention) The present invention accurately aligns both molds by placing the middle mold with the flask attached on top of the lower mold with the flask attached as described above, and then The flask is removed from the mold, the flask is recovered, and the upper mold with the flask attached is placed on top of the removed middle mold, so each line for pouring, cooling, etc. As in the past, the number of flasks that flow is limited to two types, upper and lower flasks, and equipment costs such as molding lines, flasks, and flask storage are greatly reduced.

In addition, since the medium molds are matched with the flask attached, there is no damage during handling, and the positioning during mold matching can be done using the flask as a reference, so mold matching is no different from conventional molds. It is possible.

Furthermore, since the medium mold is unframed, it is not restricted by the height of the flask, and can be molded using the minimum amount of molding sand, and sand processing equipment can also be downsized, among other effects.

[Brief explanation of the drawing]

The figures show embodiments of the present invention, and Fig. 1 is a longitudinal sectional view showing the process of carrying out the invention, and Fig. 2 is a longitudinal sectional view of the main part of an apparatus for carrying out the mold matching and frame punching process of the medium mold. Figures 3 and 3 are longitudinal sectional views of a three-tiered mold showing another embodiment. 1, 6, 13: flask, 2: lower mold, 7: middle mold, 9, 15: positioning pin, 14: upper mold.

Claims (1)

[Claims] 1. The process of placing the middle mold with a flask attached on the upper surface of the lower mold with the flask attached and matching the shapes, and removing the flask attached to the middle mold that has been matched from the middle mold. and removing the flask, and placing and aligning an upper mold with an attached flask on the upper surface of the middle mold from which the flask has been removed.