JPS6119346B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides casting molds in which, for example, one mold has a male die and the other mold has a female die for receiving the male die. The present invention relates to a manufacturing method characterized in that the mold surface can be easily centered and the mold can be formed with high precision.

Traditionally, in this type of casting mold, the upper and lower molds are manufactured separately, which makes it difficult to perform centering, cutting, and grinding to finish each mold surface into a pair of mold surfaces. It required an extremely large number of means and required great skill.

In the present invention, an upper mold and a lower mold are integrally cast by connecting them with a plurality of vertical circular pillars, and each circular pillar is provided with a communication hole leading to the upper mold and the lower mold,
The circular column is cut at the mold surface provided on the upper mold and the lower mold to separate the upper mold and the lower mold, and a guide pin is planted in each communication hole of the upper mold and the lower mold to separate them. Draw the coordinates of the mold surface using the guide pin as a reference, and use these coordinates to center the mold.
This allows for efficient work.

Embodiments of the present invention will be described below with reference to the drawings.
Figure 1 shows an integrally formed cast body in which an upper mold 1a and a lower mold 1b are connected by circular pillars 2 standing vertically at the four corners, and the mold surface of the upper mold 1a is A recess 3 is formed at the center of the lower surface of the lower mold 1b, and a protrusion 4 having a shape corresponding to the recess 3 is formed at the center of the upper surface of the lower mold 1b. A guide hole 5 is formed concentrically with each circular column 2.

Next, the process of manufacturing a cast body having such a shape will be explained in order. In FIG. 2, 6 is a casting sand mold having a cavity 7 in which the upper mold 1a, the lower mold 1b and each circular column 2 are to be formed, and projections 8 are provided on both upper and lower surfaces of the cavity 7 to form guide holes 5. There is. Numeral 9 is a core for forming the mold surfaces of the upper mold 1a and the lower mold 1b, and is mounted in the center of the cavity 7. A protrusion 10 for forming the recess 3 is provided on the upper surface of the core 9, and a recess 11 for forming the protrusion 4 is provided on the lower surface. Note that the protrusion 10 is slightly smaller than the predetermined size of the recess 3, and the recess 11 is slightly smaller than the predetermined size of the recess 3.
is made slightly larger than the predetermined dimension of the convex portion 4 to provide a machining allowance. 12 is a sprue provided on the side surface of the sand mold 6 so as to communicate with the cavity 7.

By injecting molten metal into the casting sand mold 6 thus formed through the sprue 12, a cast body as shown in FIG. 1 can be formed.

The communicating holes 13 are vertically arranged around each guide hole 5 of this cast body in the upper mold 1a, the circular column 2 and the lower mold 1b.
Penetrate it and open it as shown in Figure 4. In addition, before opening this communication hole 13, the upper surface of the upper mold 1a and the lower surface of the lower mold 1b are finished to be smooth surfaces, and the communication hole 13 is finished.
3 is formed exactly vertically.

Next, each circular column 2 is cut at the lower surface of the upper mold 1a and the upper surface of the lower mold 1b, and the upper mold 1 is cut as shown in FIG.
a and the lower mold 1b are separated. Then, guide pins 14 are implanted in each of the communication holes 13 of the separated upper mold 1a and lower mold 1b.
As shown in FIGS. 6 and 7, the sharpened tips 15 are made to slightly protrude from the mold surfaces of the upper mold 1a and the lower mold 1b.

Then, appropriate lines are drawn on the mold surfaces of the upper mold 1a and the lower mold 1b using the sharp tips 15 of each guide pin 14 as reference points to draw desired coordinates 16. The concave part 3 and the convex part 4 of the lower die 1b are centered, and this enables highly accurate machining by cutting and grinding the machining allowance, and the machining position and dimensions can be accurately and easily determined. be able to.

As described above, the casting mold manufacturing method of the present invention connects the upper mold and the lower mold by vertically erecting circular columns at each corner with the mold surfaces facing each other. A communication hole leading to the upper mold and the lower mold is formed in each circular column, and each circular column is cut at the surface of each mold to separate the upper mold and the lower mold. The feature is that guide pins are installed in the holes, and the processing part is centered and processed using each guide pin as a reference, and as mentioned above, the upper mold and the lower mold are integrally connected. In this state, communication holes are opened vertically, and the mold surfaces of the upper and lower molds are centered based on the guide pins installed in these communication holes, so that they can correspond to each other without misalignment. This has the advantage that the mold surface can be formed extremely efficiently.

[Brief explanation of the drawing]

The figures are for explaining the present invention, and Fig. 1 is a perspective view of a cast body, Fig. 2 is a sectional view of a casting sand mold forming the cast body shown in Fig. 1, and Fig. 3 is the same as that shown in Fig. 1. 4 is a cross-sectional view of the cast body shown in FIG. 3 with communication holes extending from the circular column to the upper and lower molds, and FIG. 5 is a cross-sectional view of each circular column cut away. 6 is a completed perspective view of the upper mold and lower mold, and FIG. 7 is a sectional view of the same. 1a... Upper mold, 1b... Lower mold, 2... Circular column,
13...Communication hole, 14...Guide pin, 16...
Coordinate.

Claims (1)

[Claims] 1 A casting mold consisting of an upper mold and a lower mold each having a mold surface has a circular pillar erected between the mold surfaces and at the corner to connect the upper mold and the lower mold to form an integral part. At the same time, each circular column is provided with a communication hole leading to the upper mold and the lower mold, the circular pillar is cut at the mold surface to separate the upper mold and the lower mold, and the upper mold and the lower mold are separated. A casting method characterized in that a guide pin is installed in each communication hole of the mold, coordinates are drawn on the surface of the mold based on each guide pin, and the center of the mold is centered based on the coordinates. Mold manufacturing method.