JPS6121211Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a honeycomb extrusion molding die.

In a honeycomb structure, a skin is formed to reinforce the outer core so as not to damage it, but a die with a satisfactory structure has not yet been proposed.

For example, as shown in Fig. 1, the die A is provided with a large number of circular clay introduction passages 1, ... and a core molding groove 2 in a desired shape, and a mask B is provided on the discharge side of the die A. was fixed. This mask B is formed so as to fit into the core molding groove 2 of the die A, and has an inner circumferential surface 3 that widens toward the end.

Although the above structure makes it possible to effectively utilize all the core molding grooves 2, there is a drawback that the core at the outer circumference of the die may be bent or broken, and the skin is often disturbed.

Moreover, what is shown in FIG. 2 is the inner circumferential surface 3 of the mask B.
is formed so as to be located closer to the center than the outer periphery of the die A, and a skin forming clay reservoir 4 is provided in a part thereof so that it can be discharged from a passage 5.

According to the above configuration, although the skin can be formed uniformly, there is a drawback that the outer circumferential portion of the core molding groove cannot be easily used effectively.

SUMMARY OF THE INVENTION In view of the above-mentioned drawbacks of the conventional technology, it is an object of the present invention to provide a honeycomb extrusion molding die that can effectively use the outer periphery of the core molding groove and form a uniform skin.

The structure of the present invention will be explained in detail based on the embodiment shown in FIG. The tip member 7 is adhesively fixed to the hole member 6. The outer circumferential diameter of the tip member 7 is chamfered to provide an arc-shaped surface 8 on the outer periphery, and a grid-shaped clay reservoir 9 that communicates with each other is provided on the adhesive surface side, and a width extends from this clay reservoir 9 to the discharge end surface. A narrow core molding groove 2 having the same shape and width is provided.

On the other hand, mask B is formed so as to be fixed to die A, and as can be seen from FIG.
The inner diameter of the core molding groove 2, . 4' and a passage 5' is formed inside thereof.

The embodiment of the present invention is constructed as described above, and the clay introduced from the introduction passage 1,...
The clay accumulates in the clay reservoir 9 and is discharged from the core molding grooves 2, . . . to form a honeycomb structure. At this time, the clay discharged from the outermost core molding groove 2 is removed from the mask B.
The progress of the clay is inhibited by this process, and after it is temporarily accumulated in the skin clay reservoir 4', it is discharged from the passage 5' to form the skin.

Note that in the above embodiment, the die A was explained as being constructed with the tubular hole member 6 and the tip member 7 as separate bodies, but they may be constructed as one piece, and the clay reservoir 9 is not provided. It's also good.

The present invention has the above-mentioned configuration and function, and the inner circumferential surface 3 is formed by forming the core molding groove 2, the circular arc surface 8 of...
It can be easily made slightly smaller, and thereby all the core molding grooves 2, . . . can be effectively utilized. Since the clay is discharged from the skin clay reservoir 4' along the arcuate surface 8 provided on the outer periphery of the die A, there is no possibility that the clay will be cut off.
The skin is discharged internally and is integral with the honeycomb, making it possible to form a skin with a uniform thickness without uneven extrusion.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an example of a conventional honeycomb extrusion molding die, Fig. 2 is a sectional view showing another example, and Fig. 3 is a sectional view showing an example of a conventional honeycomb extrusion molding die.
The figure is a sectional view showing an embodiment of the honeycomb extrusion molding die according to the present invention, and FIG. 4 is a front view thereof. In the figure, A is the die, B is the mask, 1 is the introduction passage, 2 is the core molding groove, 3 is the inner peripheral surface, 4' is the clay reservoir for the skin, 8 is the circular arc surface, and 10 is the notch step. .

Claims (1)

[Scope of utility model registration request] The outer periphery of the core molding groove 2 of the die A is chamfered to form an arcuate surface 8, and a cutout step 10 is provided on the mask B so as to completely cover the arcuate surface 8, thereby forming a skin clay reservoir 4'. and a passage 5', and the inner circumferential surface 3 is located in the center of the arc surface 8 of the core molding groove 2.