JPS582522Y2 - Chamfering jig for core sand mold for casting - Google Patents

Description

[Detailed description of the invention] When casting hollow articles in metal casting, a core hardened with sand is used.

If the shape of the cast article is complex, the core sand mold is divided into various parts and then joined and integrated in the sand molding process.

During integration, if a lump of sand adheres to the joint and protrudes, the flow of molten metal into the protruding part of the soft lump will be blocked during casting, resulting in unexpected defective parts in the cast product.・Results in rising.

Therefore, it is necessary to scrape off the protruding part of the soft lump from the sand core mold, but since the core sand mold of an automobile engine has a high temperature close to 200'C, it is necessary to scrape off the protruding part of the soft lump from the sand mold. It was extremely difficult to remove it.

This idea adheres to and overhangs the surface of such a core sand mold.
This invention relates to the improvement of a jig for automatically scraping off burr-like soft lumps.

In the embodiment shown in FIG. 1 of the accompanying drawings, the chamfering jig includes upper and lower end plates 1 and 2 formed in a specific shape, and both end plates 1.
, 2 are attached between both end plates at a predetermined distance, and the required number of ropes 3, 3... are formed into a foil shape, and a support shaft 4 is attached to the end plate. ing.

0-7'3 is made by twisting several fine stainless steel wires or piano wires made of nickel-chrome steel and forming it into a rope shape, which is then cut to an appropriate length to the size of the object to be ground, the core sand mold. It depends, but it is cut into pieces of, for example, about 20 crrL.

The upper and lower end plates 1 and 2 are disk-shaped with the same size, and through holes are provided on the inner periphery of the end plates 1 and 2 at intervals of 5 to 10 m/rrl, and the single rope 3° is inserted into the through holes. 3. Insert and secure both ends of each.

Each single rope 3 is provided with a slightly X diagonal between both end plates 1 and 2, and the entire rope is formed into a somewhat twisted basket shape.

In addition, the midsection of each rope 3°3... is inflated so that the part protrudes somewhat from the circumferential surface of the end plate 1°2.

A support shaft 4 is attached to the upper and lower end plates 1 and 2 so as to pass through their centers, and by rotating the support shaft 4, the protruding soft mass of the core sand mold is scraped off with the belly surface of the rope 3. By using the flexibility and rotational force of the rope 3, the soft lumps were instantly brushed off, making it possible to create a practical jig for chamfering core sand molds.

In the second embodiment shown in Fig. 2, the upper and lower end plates 10° and 11 are of different sizes, and each rope is 3° and 3...
・ is stretched straight between both end plates, and the rope 3, 3 ・
・・・・・・A large and small ring of single wire material 12゜13.
14 is placed on the inside and fixed thereto, and is formed into a deformed conical foil shape, and when rotated about the central support shaft 15, the deformed conical surface enables grinding of the deformed outer surface of the core sand mold. There is.

As described above, the core sand mold chamfering jig of the present invention is a chamfering jig that can easily form various shapes compatible with sand molds with complex external surface shapes, is robust, and is excellent in practical use. I was able to do that.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the core sand mold chamfering jig of the present invention, and FIG. 2 is a front view of the second embodiment. 1.2, 10, 11 are upper and lower end plates, 3 is rope, 12.1
3 and 14 are rings.

Claims (1)

[Scope of utility model registration request] A rope made by twisting several thin stainless steel wires or piano wires is cut to an appropriate length, and both ends of the cut rope are cut into appropriate shapes around the upper and lower end plates formed into a specific shape. A chamfering jig for a sand mold for a casting core, which is fixedly mounted at intervals, formed entirely in a foil shape, and has a support shaft attached to the end plate.