JPH0785887B2 - Ceramic-based products, extrusion molding method for synthetic resin products, and composite die - Google Patents

Description

TECHNICAL FIELD The present invention relates to a ceramic product such as a cement composition, a mortar extrusion molding method for a synthetic resin product, and a composite die.

[Conventional technology]

Ceramic products such as cement compositions, synthetic resin products and the like have hitherto been produced by an extrusion molding method as disclosed in JP-A-55-16050. This method has an advantage that products having various cross-sectional shapes can be industrially efficiently manufactured by replacing the die of the extruder.

[Problems to be Solved by the Invention]

The die used in this extrusion molding method generally has a cross-sectional shape that matches the cross-sectional shape of the molded product, and as shown in FIGS. Are the same,
Even for the molded products 10a and 10b having a simple groove on the outer peripheral portion, it is common to manufacture and use the special die dies 3a and 3b. The reason is that even if the part corresponding to the groove of the die is previously cut into a concave shape, and the die provided with the groove shape of the molded product is fitted and fixed to the concave shape with a bolt or the like, the die and the die This is because a slight gap is formed in the fitting portion, and when extrusion molding is performed, the thread groove 11 is formed on the surface of the molded product at a position corresponding to the portion of the gap, which is a quality problem. In particular, as shown in FIG. 6, when the groove shape is eliminated and the surface is made smooth, thread-like grooves appear remarkably, which causes a problem that the surface quality of the extruded product is significantly deteriorated. Therefore, even when manufacturing a molded product having the same outer dimensions and provided with a simple groove, it is necessary to manufacture a dedicated die for each molded product, which is industrially very difficult. It is uneconomical.

[Means for Solving the Problems]

The gist of the present invention is to roughly mold the shape of the product outer peripheral portion by a main die having a pattern die detachably attached to the tip of the die forming the outer periphery of a molded product of an extruder, and then to the tip of the main die. Ceramic products characterized by finish molding with an unbroken top gauge die attached, extrusion molding method for synthetic resin products, and pattern dies that can be partially replaced according to the product pattern An extrusion-molded composite die for a ceramic product or a synthetic resin product, characterized in that a main die configured and a top gauge die having the same shape and having no break are attached to a tip portion of the main die.

[Work]

The present invention is a composite die mold die forming the outer periphery of the molded product of the extrusion molding machine, substantially molding the outer peripheral shape of the product in the main die,
Next, finish molding is performed with a highly accurate top gauge die that matches the outer peripheral shape of the molded product attached to the outlet side of the main die.

FIG. 1 is a vertical cross-sectional view illustrating the structure and operation of the present invention. Inside the discharge unit 1 of the extruder, a screw 11 for feeding the raw material is equipped. Discharge part 1 of extruder
And the main pipe die 3 that regulates the outer peripheral shape of the molded product, the connecting pipe 2
Connect with. The inner surface of the main die 3 is provided with a plurality of concave grooves 31 to 33 at positions where various groove patterns are formed as shown in FIG. Pattern dies 41-43 for molding groove patterns of molded products fitted to 31-33
Is fixed to the main die 3 with a pattern die mounting bolt 5 or the like. Further, a top gauge die 6 having a high accuracy and conforming to the outer peripheral shape of the product is fixed to the exit end surface of the main mouth die 3 by a top gauge die mounting bolt 7. Further, the mutual positioning of these is accurately performed by the knock pin 8 or the like. 10 is the final finished molded product.

When extrusion molding of a molded product as shown in FIGS. 1 and 2 is performed, the mortar 9 as a raw material is fed to the main die 3 through the connecting pipe 2 by the raw material pressure-feeding screw 11 of the extruder. Is coming. The mortar 9 is gradually compressed on the inner surface of the main die 3 and starts to form the outer peripheral shape of the molded product, and at the same time, a groove pattern is formed on the surface of the molded product by the pattern dies 41 to 43. In this way, after the outer peripheral shape and groove pattern of the molded product are formed, the entire outer peripheral portion is stroked with a highly accurate top gauge die 6 that is equal to the cross-sectional shape of the molded product. The thread-shaped groove on the surface of the molded product 10 can be completely eliminated by the gap between the mating portion of the die and the groove-shaped die.

〔Example〕

FIG. 3 is a cutaway perspective view of a main part as seen from the exit side of the molded product. The top gauge die 6 is made to have almost the same cross-sectional shape as the finished cross-section of the molded product to be newly manufactured, and has a molding function of slightly stroking the entire area of the molded product roughly molded by the main die 3. It is made to the size of. If extrusion molding is performed in this manner, a molded product can be continuously molded in a highly accurate shape.

Further, FIG. 4 shows an example in which the present invention is carried out with another die such as a corner molded product. The basic configuration and operation are the same as those described above, and are omitted here.

〔The invention's effect〕

As described above, according to the present invention, if the outer peripheral shape of the molded product is almost the same, various groove patterns can be easily formed on the surface of the molded product by replacing the pattern die and the top gauge die with one main die. Moreover, the wear of the top gauge die having the entire pattern is extremely small, so that the die cost can be reduced and the surface of the molded product can be manufactured very smoothly.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view for explaining the structure and operation of the present invention, FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1, FIG. 3 is a cutaway perspective view of an essential part showing an embodiment, and FIG. FIG. 5 is a perspective view showing a molded state of a molded product having a groove portion, and FIG. 6 is a perspective view showing a molding example by a conventional composite die for molding the groove portion. 1 ... Discharge part, 2 ... Connection pipe, 3 ... Main mouth die, 4 ... Pattern die, 5 ... Pattern die mounting bolt, 6 ... Top gauge die, 7 ... Top gauge die mounting bolt, 8 …… Knock pin, 9 …… Mortar, 10 …… Molded product, 11 …… Raw material feed screw, 31 to 33 …… Concave groove, 41 to 43 …… Pattern die.

Claims (2)

[Claims] 1. A main die having a pattern die removably attached to the tip of a die forming the outer periphery of a molded product of an extrusion molding machine roughly forms the shape of the outer periphery of the product, and then attaches to the tip of the die. An extrusion molding method for ceramic products and synthetic resin products, which is characterized by finish molding with a continuous top gauge die. 2. A main die having a pattern die which is partially replaceable in correspondence with the pattern of a product, and a top gauge die which has the same shape and has no break at the tip of the main die. Extrusion molding compound die for ceramic products and synthetic resin products characterized by being attached.