JPH01178403A - Manufacture of extrusion molded nozzle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an improvement in a method for manufacturing an extrusion molding nozzle for producing various porous members by extrusion molding a flowable material.

(Prior art) Conventionally, in order to make various porous members, such as ceramic perforated plates, a paste-like ceramic raw material before firing is extruded using an extrusion molding nozzle, then cut into required lengths, and fired. Was.

The extrusion molding nozzle has a rectangular lattice groove 1 of uniform width cut at a predetermined depth for extruding the fluid material on the lower surface side, and the lattice groove 1 on the upper surface side as shown in FIGS. 2a and 2b. Circular introduction holes 2 for flowing the fluid material into the lattice-like grooves 1 are formed at equal intervals so as to communicate with the intersections 1a of the lattice grooves 1 and concentrically with the center of the intersections 1a.

(Problems to be Solved by the Invention) By the way, the extrusion molding nozzle 3 having the above structure has lattice grooves l.
After cutting the circular introduction holes 2, holes 1 to 15 shown in Fig.
The holes are drilled in the following order. Therefore,
As a drill is machined, it wears out, becomes less sharp, and the hole diameter gradually increases. If you change the drill halfway, the introduction hole 2 in that part will return to its original small hole diameter, but as you drill the introduction hole 2 one after another, the drill will wear out, become dull, and the hole diameter will gradually become larger. .

As mentioned above, conventionally, the extrusion molding nozzle 3 has a large number of introduction holes 2.
Because Kongming frequently changes the drill when machining,
When Komei inspects the entire large number of introduction holes 2 after processing, he finds that the fourth
As shown in the figure, the hatched introduction hole 2 was drilled by replacing the drill.
The introduction hole group A, which is drilled after 2', has a small hole diameter, and the introduction hole group B, which is drilled before the hatched introduction hole 2', has a large hole diameter.

When a paste-like ceramic raw material with high viscosity is extruded using the extrusion molding nozzle 3, which partially has introduction holes with large diameters and introduction holes with small diameters, there is a clear difference in flow rate, and the resulting porous The width of the lattice frame of the member is partially different, resulting in poor dimensional accuracy.

(Objective of the Invention) The present invention was made in view of the above-mentioned circumstances, and it is an object of the present invention to provide a method for manufacturing an extrusion molding nozzle in which differences in introduction hole diameters are partially eliminated.

(Means for Solving the Problems) In order to solve the above problems, the method for manufacturing an extrusion molding nozzle according to the present invention is to cut a lattice-shaped groove to a required depth on the lower surface of a metal plate, and then When drilling a circular introduction hole that communicates with the intersection of the lattice grooves from the upper surface at the intersection and the back, it is recommended that the introduction hole be drilled by dismantling the casing. This is a characteristic feature.

(Function) As described above, in the method for manufacturing an extrusion molding nozzle of the present invention, the order of drilling the circular introduction holes communicating with the intersections of the lattice grooves is varied. Introductory holes that have become larger in diameter due to wear or smaller holes due to drill replacement (introduction holes that have become smaller in diameter do not aggregate locally but are dispersed. Therefore, introductory holes do not have differences in hole diameter locally and have a high viscosity. Even when a fluid material is introduced and flows into the lattice grooves, there is no local difference in flow rate and the flow rate is averaged, so the porous member extruded from the lattice grooves has almost no variation in the width of the lattice frame. is eliminated, resulting in high dimensional accuracy.

(Example) An example of the method for manufacturing an extrusion molding nozzle of the present invention will be described with reference to FIG. After cutting the metal plate P, an introduction hole 2 of a required diameter is bored at the center of the intersection 1a of the lattice groove 1 so as to communicate with the intersection 1a of the lattice groove 1. The introduction holes 2 are bored in a random order, for example, numbers 1 to 5 shown in FIG. 1. Drilling such an introduction hole 2 is as follows:
This is also done when a large number of introduction holes 2 have been drilled and the drill is replaced.

In the extrusion molding nozzle 3' manufactured in this way, the introduction holes 2 whose diameters have increased due to wear of the drill and the introduction holes 2 whose diameters have become smaller due to drill replacement are not partially aggregated but are dispersed. There is no difference in the hole diameter in some parts of the introduction hole 2, and even when a paste-like ceramic raw material with high viscosity is introduced and flows into the lattice groove 1, there is no difference in flow rate in part,
Average. Therefore, the porous member extruded from the lattice-shaped grooves 1 has almost no variation in the width of the lattice frame, and has high dimensional accuracy.

Although the above embodiment is for manufacturing an extrusion molding nozzle having square lattice grooves 1, the present invention can also be applied to manufacturing an extrusion molding nozzle having lattice grooves such as triangular, pentagonal, hexagonal, or rhombic. The invention is applicable.

(Effects of the Invention) As can be seen from the above explanation, according to the method of manufacturing an extrusion molding nozzle of the present invention, the large number of circular introduction holes communicating with the intersections of the lattice grooves does not partially differ in hole diameter. , by introducing a highly viscous fluid material, there is no local difference in flow rate even when it flows into the lattice grooves, and from the lattice grooves there is almost no variation in the width of the lattice frame, resulting in a porous member with high dimensional accuracy. This has the effect of producing a nozzle that can be extruded.゛ □

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the method for manufacturing an extrusion molding nozzle of the present invention,
FIGS. 2a and 2b are longitudinal sectional views and plan views of the extrusion molding nozzle,
FIG. 3 is an explanatory diagram of a conventional method of manufacturing an extrusion molding nozzle, and FIG. 4 is a diagram showing differences in hole diameters of partial introduction hole groups of an extrusion molding nozzle obtained by the conventional manufacturing method. 3...Bottom! E! Noda) Nozzle Figure 2 (C1) Figure 2 (b) Figure 3

Claims (1)

[Claims] After cutting lattice-shaped grooves to the required depth on the lower surface of the metal plate, circular introduction holes are drilled from the upper surface of the metal plate to communicate with the intersections of the lattice-shaped grooves, concentrically with the intersections. A method for producing an extrusion molding nozzle, characterized in that the introduction holes are formed in a different order.