JPH0237489Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> This invention separates a cast product consisting of a product and runners (sprues, runners, risers, weirs, etc.) in the mold before breaking the molds. Regarding casting molds.

<Conventional technology> Conventionally, in order to separate cast products and runners, there has been a method of using vibrations from a shake-out machine, etc. in the process of breaking the mold after solidification of the molten metal, or a method of separating the cast products and runners. Commonly used methods include separating the cast product by hitting it with a hammer or the like, or pressing it with a press machine using a jig. However, in the method of separating by vibration during the demolding process, separation may not be possible depending on the degree of coagulation and the size of the separation part. In addition, in the separating method of hitting with a hammer, the impact force differs depending on the person because the work is done manually, and the force is not sufficient, so many hits must be made, which is hard labor that requires a relatively long time. It had drawbacks such as bad sex.

In addition, in the method of separating using a press machine,
It is necessary to fix each cast product using a jig or the like, and the setting work at this time relies on manual labor, which results in poor work efficiency and the risk of separated products flying off during separation, which also reduces productivity and safety. There were problems with sexuality etc. In particular, cast iron with high toughness such as spheroidal graphite cast iron,
It is difficult to separate not only with a hammer but also with a press machine.
Separated products also had the disadvantage of being more likely to fly.

An object of the present invention is to eliminate the above-mentioned drawbacks and provide an improved casting mold that allows easy separation of cast products and runners within the mold.

<Means for Solving the Problems> In order to achieve the above object, the present invention is constructed as follows. That is, a casting mold in which a plate-shaped separation tool is arranged at the separation position of the mold cavity, intersecting the mold cavity.

<Operation> When molten metal is injected into the mold cavity and the molten metal is solidifying, that is, when the molten metal is still soft before solidification, when the separating tool is pressed and inserted into the molten metal, the molten metal Because it is soft, the separation tool can be easily inserted at a position that intersects with the casting. In this way, the molten metal is separated by the separating tool, and the cast products can be easily separated.

<Examples> Examples of the present invention will be described below based on the drawings. Figures 1 and 2 show the case of sand mold A, in which cavities for a sprue 2, a runner 3, a riser 4, a weir 5, and a product a are placed in a mold 1 consisting of an upper frame 1a and a lower frame 1b. A mold cavity 6 is formed. In this mold cavity 6, a metal separation tool 7 is placed at a position where the metal is to be separated after pouring, for example, on the cavity surface of the runner 3, orthogonal thereto.

The separating tool 7 consists of a plate-shaped quadrilateral separating part 7a and a handle 7b protruding from the separating part 7a. In order to position the separation tool 7, the pattern plate 8 of the upper frame 1a is
A (see Fig. 4), a pair of truncated cone-shaped support stands 9 are erected with the cut portion sandwiched between them, and the support stands 9 are placed on opposite sides facing outward from the pattern plate 8a (see Fig. 4). Cut grooves 10, 10 in the vertical direction are provided.
Then, both ends of the separating portion 7a of the separating tool 7 are inserted into the cut grooves 10, 10 from outside (in the drawing) and from above, thereby positioning the separating tool 7.

Although FIG. 4 shows a state in which the separating tool 7 is placed on the pattern plate 8a of the upper frame 1a, as shown in FIG.
Alternatively, the separating tool 7 may be placed and separated by pressing the separating tool 7 from the horizontal direction. In this case, as shown in Fig. 5 (when the upper mold and lower mold are set, the orientation is opposite to that shown in the figure), a fitting groove 11 is provided on the pattern plate 8b, and the separating tool 7 is separated therein. Insert and position the portion 7a.

After arranging the separating tool 7 in this manner, the casting flask 1a or 1b is filled with casting sand 12, and the mold A
mold.

In FIGS. 1 and 2, the separation tool 7 is shown in which the separation part 7a is a plate and is placed over the cavity to be separated, but the separation part 7a is not limited to this shape. Instead, it may be trapezoidal or conical. Further, the material may be made of a non-metal such as a sintered body of earth and sand or ceramics, as long as it has the strength to cut the solidifying molten metal and is resistant to melting.

FIG. 6 shows a casting mold in which a separating tool 7 having an inverted trapezoidal separating part 7a is arranged slightly apart from the upper surface of the separating part of the cavity 6. Figure 7 shows the same casting mold placed below cavity 6. FIG. 8 shows a casting mold in which a part of the separation part 7a is placed in contact with the upper surface of the cavity 6. Figure 9 shows
This is a casting mold in which the upper mold and the lower mold are both arranged so as to be separated from each other in the lateral direction.

When the molten metal is poured into the cavity 6 with the separating tool 7 arranged as described above, and the molten metal is solidifying, inserting the separating tool 7 into the cavity 6 will make it easier because the molten metal is not yet solid. This can be separated into two parts at the required position.

Next, a separation tool related to a metal mold as another embodiment will be described. FIG. 10 is a vertical cross-sectional view showing the state in which the separation tool 21 is placed in the metal mold B;
The figure is a perspective view showing the separation tool 21 used here. In Figure 10, the metal mold B is divided into two parts: one (left side in the figure) is a fixed side mold _B1 , and the other side (on the right side in the figure) is a movable side mold _B2 . Inside mold B, riser cavity 22 and runner cavity 2
3. Forming the product cavity 24. Then, an insertion hole 25 is provided that opens to the outside of the mold in a right angle direction (left and right in the figure) from the cavity part to be separated, for example, the runner cavity 23, and in the hole 25, a separating tool 21A on the pressing side shown in FIG. Pressure side separation tool 2
1B is installed. A trapezoidal notch 26 having the same cross section as the runner cavity 23 is provided at the tip of the separating part 21a of the separating tool 21 on the dividing surface side. I made sure it wasn't blocked. A handle 21b is provided on the back side of the separation part 21a, and the handle 2
The first pressing tool 27 inserted into 1b from the outside of the mold B
Concatenate. A first spring 28 is interposed between the operating rod 27a of the pressing tool 27 and the outer wall of the mold (movable side) _B2 . A convex portion 21C is provided at the corner of the back side (left side in the figure) of the separation tool 21B, and a convex portion 21C is provided on the side of the convex portion 21C.
The second pressing tool 29 inserted from the outside is connected, and the second spring 3 is connected to the passive rod 29a of the second pressing tool 29.
Interpose 0. One end (right side in the figure) of the second spring 30 is brought into contact with the end of the separation tool 21B, and the other end (right side in the figure) is brought into contact with the lid 31. Note that the second spring 30 is set to be slightly stronger than the first spring 28.

Next, the operation of the above embodiment will be explained.
When molten metal is poured into the cavity 24 and the molten metal is solidifying, when the first pressing tool 27 is pushed to the left in the figure, the separating tool 21B is pushed by the separating tool 21A and the second pressing tool 27 is pushed to the left in the figure.
Spring 30 is shortened. Second spring 30
When is shortened, the second pressing tool 29 moves, thereby causing the separating tool 21A to enter the separating tool 21B side. By this movement of the separating tool 21A, the molten metal is separated by the separating section 21a of the separating tool 21A. When the pressing force on the first pressing tool 27 is released, the elastic force of the first spring 28 and the second spring 30 causes both the first pressing tool 27 and the second pressing tool 29 to move to the right in the figure and return to their original positions. Revenge.

<Effects of the invention> As explained above, the present invention has a separation tool that is inserted into the casting and separates the casting when the molten metal injected into the mold cavity is solidifying. Since the molten metal is placed in advance, the casting can be separated very easily by inserting the separation tool into the mold cavity when the molten metal solidifies, and this has great effects on workability, environment, and safety. It contributes to the development of industry.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a casting mold according to the present invention, Fig. 2 is a longitudinal cross-sectional view showing a separation tool, Fig. 3 is a plan view showing the separation position, and Fig. 4 is a - perspective view in Fig. 3. 5 is a - perspective view in FIG. 3, FIGS. 6 to 9 are longitudinal sectional views showing the positional relationship between the separation tool and the cavity, and FIG. 10 is a longitudinal sectional view showing the metal mold. FIG. 11 is a perspective view showing the separating tool. 1...Casting flask, 6...Mold cavity, 7,21
...Separator, A...Sand mold, B...Mold mold.

Claims (1)

[Scope of utility model registration request] A casting mold in which a plate-shaped separation tool is arranged at the separation position of the mold cavity, intersecting the mold cavity.