JPH0321811Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The invention of the present application is a core setter technology for molds related to the manufacture of centrifugally cast pipes mainly used for water supply, sewage, etc.

[Prior Art] At present, there are two main methods for manufacturing centrifugally cast tubes: the Drabaud method and the resin sand method. The Drabaud method is suitable for mass production as a series of systems that combine a casting machine and a mold. Therefore, it is relatively easy to mechanize or automate each process, and the development of a device for inserting and fixing the annular core into the entire opening of the mold has been announced. For example, there are "core setters for centrifugal casting machines" (Japanese Patent Application Laid-open No. 119364/1982) and "centrifugal casting machines" (Japanese Patent Publication No. 7343/1983).

On the other hand, in the resin sand method, resin sand is applied to the inner surface of each mold and transported to the casting machine individually. It is said to have special characteristics.

[Problems to be solved by the invention] The carrier of the invention here is a resin sand type centrifugal tube mold. As already mentioned, this method proceeds by accumulating individually divided tasks, so it is hard to deny that it is relatively difficult to rationalize the individual tasks themselves, and the core The insertion and fixing was still completely manual work. Figure 5 shows a typical example of this, in which molten metal M is injected into the mold 1a during high speed rotation.
However, the core (mold band) Ca, which is dammed to prevent it from escaping, is inserted and fixed into the entire opening of the mold. A plurality of holes are drilled evenly on the circumference, and the turret pin 15 is inserted therethrough obliquely from the inner surface to the outer surface and is locked therein. Before casting, the locking of the turret pin must be done entirely manually by the worker using a hammer, which poses many issues in terms of safety and working environment. Furthermore, since it is done by hand by an individual, there is a good chance that the strength of the locking pin may vary, which could lead to an accident of water leakage during pouring.

In order to solve the above problems, the present invention aims to provide a core setter that is simple and does not require direct manual work.

[Means for Solving the Problems] The core setter for the casting pipe mold according to the present invention has an annular front lid with both flanges in contact with the entire surface of the core, and an annular groove is formed in the flange of the front lid and the inner surface of the mold. A plurality of locking rods are inserted into the annular flange by penetrating through the flange, and are mounted on the front cover surface so as to be able to move forward and backward, and the lower portion of the locking rods is always urged toward the inner surface of the mold. In addition to attaching an elastic spring, a presser lever is rotatably supported in the middle part of the locking rod to push it down to the opposite side against the biasing force, and the presser lever is detachably attached to the front cover equipped with these members. The above problem was solved by combining a release ring that rotates by pushing a lever and a drive mechanism that moves the release ring horizontally forward and backward.

[Operation/Example] The operation will be explained based on FIGS. 1A (front sectional view) and B (side view) and FIGS. 2 to 4 showing an example of the present invention.

An annular front cover 4 with both flanges is brought into contact with the entire surface of a core C to be fitted into the front opening of a mold 1 for a centrifugal casting tube.

On the other hand, an annular groove 5 is formed in the outer peripheral side collar 2 of the front lid and the inner surface of the mold 1 installed therein. The action of attaching and detaching the core is caused by a plurality of locking rods 6 mounted on the front lid moving forward and backward into the annular groove 5 of the mold. A through-hole 7 in the collar through which the locking rod passes to indicate this movement, an elastic spring 8 that urges the locking rod toward the inner surface of the mold, a presser lever 9 that pushes the locking rod back in the opposite direction, and a protrusion on the presser lever 9. A release ring 11 that pushes 10, and a drive mechanism 13 that moves this release ring 11 horizontally forward and backward.
(Fig. 4) is provided.

FIGS. 1A and 1B show the core C before it is inserted into the mold.

In other words, the core setter cylinder 12 is placed in advance outside the mold.
The core and the front cover 4 are placed tightly on the outer periphery of the core setter, and the release ring 11 moves to the right by the driving force 13 of the core setter and presses the protrusion 10, so the presser lever 9 rotates, and this movement The locking rod 6 is pushed downward (in the axial direction) by overcoming the biasing force of the elastic spring 8.

Figure 2 shows the core setter cylinder moving forward in the state shown in Figure 1 and inserting the core C and front cover 4 into the mold 1.
The locking rod 6 remains retracted and does not interfere with insertion into the mold.

In FIG. 3, the core setter has moved back to the left, and the release ring 11 and the core setter barrel 12 have been separated from the mold 1. The locking rod 6 loses the downward pressing force of the release ring 11, overcomes the upward urging force of the elastic spring 8 again, moves forward, and its tip enters the annular groove 5 of the mold.
This action proceeds simultaneously at several locations on the front cover surface to lock and fix the front cover and therefore the core C within the mold.

Fig. 4 shows an example of the entire core setter, which is mounted on a traveling carriage and can move from side to side by itself.The core setter body 12 can be raised and lowered vertically, so that the core setter body 12 can be moved up and down vertically. Can be matched.

[Effects of the invention] As described above, the core setter according to the invention of the present application is easy and versatile, and solves the above problems by inserting and fixing the core by remote control without requiring the direct assistance of individual workers. achieve the solution.

Since the locking of the core is crimped evenly around the entire circumference of the mold, the possibility of accidents due to human carelessness has been reduced to almost zero.

As long as the number of front lids is prepared, that number of molds can be kept on standby ready for casting, making work management and process control more flexible and allowing for a wide variety of product combinations. This allows for a wide range of production plans to be created in response to requests from pre- and post-processes such as tapping and inspection, and the unique characteristics of the resin sand method, which are not found in the Drabo method, are maintained.

[Brief explanation of the drawing]

Fig. 1A is a front sectional view of the embodiment of the present invention, Fig. 1B is a side view (one of four divisions), Figs. Embodiment FIG. 5 is a front sectional view showing the prior art. 1... Mold, 2, 3... Tsuba, 4... Front lid, 5...
...Annular groove, 6...Latching rod, 8...Elastic spring, 9...
... Presser lever, 11 ... Release ring, 13 ... Drive mechanism, C ... Core.

Claims (1)

[Scope of utility model registration request] In a core setter for a centrifugal casting pipe mold, in which an annular core is inserted and fixed into the opening on the entire surface of the centrifugal casting pipe mold, an annular front cover with both flanges is brought into contact with the entire surface of the core,
An annular groove is cut into the flange of the front lid and the inner surface of the internal mold.
A plurality of locking rods that are inserted into the annular groove through the flange are installed on the front cover surface so as to be able to move forward and backward, and an elastic spring that always biases the locking rods toward the inner surface of the mold is attached below the locking rods. , a presser lever that presses down to the opposite side against the urging force is rotatably supported in the middle part of the locking rod;
On the other hand, there is a core setter for a centrifugal casting pipe mold, which combines a front cover equipped with these members, a release ring that is removably rotated by pushing the presser lever, and a drive mechanism that moves the release ring horizontally forward and backward.