JPS637408Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a jig for centering a sprue frame and a sprue pipe when molding a sprue mold for casting.

In upright molds such as roll casting molds, the overall length of the sprue is usually 2 to 12 m.
It is constructed by adding sprue molds of 0.5 to 2 m in length.
If there is a misalignment between the sprue frame and the sprue pipe of each sprue type, when the molten metal passes through the sprue pipe, there will be a misalignment at the joint of the sprue mold due to the misalignment of the sprue pipe, causing turbulence in the molten metal flow. There is a problem in that this accelerates melting and damage of the sprue mold, and entrains slag, sand, gas, etc. into the molten metal, resulting in a deterioration in the quality of the casting.

The present invention provides a centering jig that allows the sprue pipe to be easily and precisely installed with respect to the sprue frame when molding the sprue mold.

The present invention will be explained based on the embodiments shown in FIGS. 1 to 4. Figures 1 and 2 show the structure of the alignment jig according to the present invention, and Figures 3 and 4 show the structure of the alignment jig according to the present invention for aligning the sprue pipe and the sprue frame. An example of application is shown. Figures 1 and 4
In the figure, the centering jig is attached to the upper end of the core rod 8, which is inserted through the inner hole formed by adding a sprue pipe 3 with a length of approximately 0.5 m. It consists of an annular body 1 having a large inner diameter and a foot portion 2 attached to the annular body 1, and the foot portion 2 is latched to the upper outer edge 6 of a sprue frame 4 in which a sprue pipe 3 is installed in the center. The tip is bent so that As shown in the figure, the structure is such that the foot part 2 can be fixed simply by placing it on the upper part of the sprue frame 4.

When actually applying this alignment jig,
The sprue frame 4 is erected on the surface plate 7 so that the centering hole 9 provided in the surface plate 7 is located at the center. Next, insert the lower end of the core rod 8 into the centering hole 9 and set it upright on the surface plate 7, and then attach the required number of sprue pipes 3 made of fireproof material to the core rod 8 (four in Fig. 4). Fit it outside and add it.
In this case, the outer diameter of the core rod 8 is made slightly smaller than the inner diameter of the sprue pipe 3 so that the core rod 8 can be easily fitted onto the sprue pipe 3 or removed after completion of molding. Next, the annular body 1 of the centering jig is fitted onto the upper end of the core rod 8, and the foot 2 is attached to the sprue frame 4.
It is placed on the outer edge 6 of the upper end. Thereafter, sand 5 is filled between the sprue frame 4 and the sprue pipe 3, and the sprue pipe 3 is fixed to the sprue frame 4. After filling with the sand 5 is completed, the centering jig and the core rod 8 are removed to complete one sprue mold.

In this way, when using the alignment jig of the present invention,
The sprue pipe can be accurately and easily aligned with the sprue frame, and when constructing by adding sprue molds, if the sprue frame is placed accurately, the sprue pipe will not be misaligned, thus preventing damage to the sprue. This has the effect of preventing entrainment of sand, etc. due to this.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an embodiment of the present invention, FIG. 2 is a front view, and FIGS. 3 and 4 are a plan view and a vertical sectional view showing an application example of the embodiment of the present invention. 1: Annular body, 2: Foot, 3: Sprue pipe, 4: Sprue frame, 6: Upper outer edge, 8: Core rod.

Claims (1)

[Scope of utility model registration request] A sprue pipe centering jig characterized by having a ring having an inner diameter slightly larger than the outside diameter of a sprue pipe assembly core rod, and a foot portion capable of fixing the ring to the upper end of a sprue frame.