JPS6048255B2 - Mold equipment for mold making - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a molding device for mold making, and particularly to a blowing type molding device.

The molding of molds such as cores is generally done by using a mold device that includes at least two molds that are combined with each other to define a mold space, and by blowing green hard through a green sand blowing port provided in the mold device. It is carried out by

The green sand blowing port is generally formed along the mating surfaces of the mold, so when the mold is opened after molding, the rod-shaped blowing hole formed by the green hard filled in the green sand blowing port The filling marks are removed from the mold along with the core and other mold parts. For this reason, conventionally, after the mold is removed from the mold, the blow marks must be manually cut and removed. SUMMARY OF THE INVENTION An object of the present invention is to provide an improved mold device for making a mold, which can automatically remove blow marks by using the opening motion of the mold.

According to the present invention, a mold space is defined by a combination of at least two molds, and green sand blowing is provided along the mating surfaces of the molds, extending substantially perpendicularly to the direction of opening and closing of the molds. In a mold-making mold device having a mouth, the green sand blowing mouth extends across the green sand blowing hole and above both of the two molds, is fixed to only one of the two molds, and is fixed to only one of the two molds. This is achieved by a mold device for mold making, characterized in that it has a plate having a hole that is closed around the circumference in a portion aligned with the inlet. According to this configuration, when the mold is opened, the blowing marks are sheared off from the mold by the blowing mark removal device due to the mold opening operation, so that the operator does not have to manually remove the blowing marks. This allows for efficient mold making.

Further, the blowing mark removing device is structurally simple and can be incorporated into a mold device without major modification of the conventional mold structure. In addition, if the blow plate of the blow device is common to other mold devices and there are blow holes in addition to the green sand inlet of the mold used, if the mold is opened even slightly at the mold matching part. , air is blown from there during blowing, resulting in defective blowing, but according to the present invention, the mold matching portion on the blowing port side of the mold device other than the blowing port is blocked by the blowing trace removing device. This prevents air from entering from the mold matching part when the chain is closed, thereby avoiding the occurrence of poor blowing and producing molds of good quality. DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 of the accompanying drawings is a longitudinal sectional view showing one embodiment of a molding device according to the invention.

In the figure, 1 is a fixed mold, and 2 is a movable mold. The fixed mold 1 and the movable mold 2 are combined with each other to define a mold space 3. The movable mold 2 has a recess 5 on its mold mating surface that cooperates with the mold mating surface of the fixed mold 1 to define a sand blowing port 4, and the sand blowing port 4 is It extends along the mold matching surface substantially perpendicular to the mold opening/closing direction, that is, the horizontal direction in the figure. Also, is there a screw in the fixed mold 1? The blow-in trace removal plate 8 is fixed by. The blowing trace removing plate 8 has a hole 9 that aligns with the casting sand blowing port 4 when the mold is closed.
have. As shown in the figure, the hole 9 and the sand blowing port 4 may be formed in a tapered shape such that the diameter increases from the top to the bottom in the figure. Further, the fixed mold 1 has an extrusion pin 10 driven by an extrusion plate 11, and the movable mold 2 has an extrusion plate 13.
A push-out pin 12 is provided, which is driven by a respective one. Next, with reference to FIGS. 2 to 4, the process of molding a mold using the mold device having the above-described configuration will be described.

Figure 2 shows a state in which the mold has been closed, the blow plate 15 of the blow device is connected to the blow trace removing plate 8, and its blow holes 16 are aligned with the holes 9 and the sand blowing port 4. It shows. ．． In this state, casting sand is blown into the mold space 3 from the blow hole 16 of the blow plate 15 through the hole 9 and from the casting sand blowing port 4. When a predetermined amount of casting sand is blown into the mold space 3 and a predetermined mold W is formed within the mold space 3,
The blowing of casting sand from the blow plate 15 is completed, and the blow plate 15 is separated from the mold. Next, as shown in FIG. 3, the movable mold 2 moves left and right in the figure to open the mold, and along with this, the ejecting pin 10 of the fixed mold 1 moves to the right in the figure. move forward. Therefore, the mold W formed in the mold space 33 moves together with the movable mold 2, as shown in FIG. At this time, the blowing marks B caused by the casting sand filled in the casting sand blowing port 4 and the holes 9 engage with the holes 9 of the blowing mark removing plate 8, and move to the right in the figure together with the casting sand W. 4. I couldn't do it. Therefore, a shearing force acts between the blowing trace B and the mold W, and the blowing trace B is sheared against the mold W thereby. The blow marks B sheared from the mold W then fall out of the holes 9 due to their own weight and are removed by natural fall. In this case, since the casting sand blowing port 4 and the hole 9 are formed in a tapered shape as shown in the figure, the blowing trace B can easily escape from the hole 9. The mold W from which the blowing marks B have been removed in this manner is then taken out from the movable mold 2 by moving the push-out pin 12 forward to the left in the figure, as shown in FIG. 4. Further, the blowing trace removal plate 8 may be provided so as to cover all the mold matching portions on the casting sand blowing side of the mold, and in this case, air is blown from the mold matching portions during blowing. This will be prevented. FIG. 5 is a sectional view showing the main parts of another embodiment of the molding device according to the present invention. In FIG. 5, parts corresponding to those in FIG. 1 are designated by the same reference numerals as in FIG. In the case of this embodiment, the blowing trace removing plate 8 is provided integrally with the fixed mold 1. Therefore, it will be understood that the same effects as those of the above-mentioned embodiments can be obtained in this embodiment as well. Although the present invention has been described in detail with respect to specific embodiments above, it will be understood by those skilled in the art that the present invention is not limited to these and that various embodiments can be made within the scope of the present invention. It should be obvious.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing one embodiment of the mold making device according to the present invention, and FIGS. 2 to 4 show how the mold making device shown in FIG. 1 is used to make a mold. FIG. 5 is a sectional view showing the main parts of another embodiment of the mold making device according to the present invention. 1... Fixed type, 2... Movable type, 3
...Mold space, 4 ...Cast sand injection port,
5... recess, 7... screw, 8...
... Blow-in trace removal plate, 9... Hole, 10...
... Push-out pin, 11 ... Push-out plate, 1
2... Push-out pin, 13... Push-out plate, 15... Bujing plate, 16...
...Blow hole.

Claims (1)

[Claims] 1 Mold space 3 by a combination of at least two molds 1 and 2
In a mold device for mold making, which has a sand blowing port 4 extending substantially perpendicularly to the opening/closing direction of the mold along the mating surfaces of the mold, the sand blowing port 4 and extends over both of the two molds 1 and 2, is fixed only to one of the two molds 1, and is closed around a portion aligned with the sand blowing port 4. A mold device for mold making, characterized in that it has a plate 8 having holes 9.