JPS6143529A - Molding method - Google Patents

Abstract

PURPOSE:To prevent a material in the inside of a nozzle from curing by improving heat retaining properties in the nozzle, by making use of ceramics for a nozzle part. CONSTITUTION:A ceramics coated film 10 to which ceramic coating has been applied is provided on a nozzle 8. A plasticized material is injected within a mold from the tip of the nozzle 8 through a sprue bushing 9. As a heat conductivity of ceramics, which is a solid inorganic material, is the extent of from 1/10 to 1/15 of that of steel as compared with the steel being used generally and the ceramic coated film 10 has been applied to the tip of the nozzle, heat retaining properties are improved and the plasticized material accumulated at the tip part of the nozzle 8 also becomes not curable. When an improvement in the heat retaining properties is desired further, steel can be replaced with ceramics as the quality of the material of the nozzle 8 and the sprue bushing 9 itself can be made into the ceramics.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a method of using ceramic, which is a solid inorganic material, in the part to be injected or the part to be injected in injection molding. This is a new proposal.

[Prior art]

Conventional injection molding uses metal for the part to be injected and the part to be injected. FIG. 1 shows the principle of a commonly used injection molding machine. 1 is a potsuba, 2 is a screw, 3 is a cylinder, and 4 is a heater. The material is stored in Botsuba 1 and rotated by 20 turns of the screw.
It is fed from the hopper 1 into the cylinder 3. The material thermoplasticized in the cylinder 5 is transferred to the screw 2
It is stored near the tip of the. The pressure generated at this time causes the screw 2 to retreat. 5a is a hydraulic cylinder, 5'b is a drive gear, 6 is a nozzle, and 7 is a mold. Just in case a predetermined amount of plasticized material has accumulated at the tip of the screw 2, hydraulic pressure is sent to the hydraulic cylinder 5a, and the screw 2 moves forward in the axial direction through the drive gear 5b, causing the nozzle 6 and the mold 7 to move forward.
The way it is ejected is a trap.

However, until the plasticized material accumulates at the base end of the nozzle 6, the heat of the nozzle 6 is easily conducted through the mold 7 and radiated, so there is a fear that the material at the tip of the nozzle 6 will solidify. Similarly to the screw 2, the cylinder 3 itself has to be moved forward and backward, which impairs production efficiency.

However, even if this procedure is applied, materials with particularly low viscosity are often forced out of the tip of the nozzle 6 and solidified, resulting in a situation in which molding is not possible, resulting in extremely low production efficiency.

[Object of the present invention]

The present invention aims to eliminate the above-mentioned drawbacks and improve production efficiency.

〔overview〕

The present invention aims to improve production efficiency by using ceramic, which is a solid inorganic material with low thermal conductivity, for the injection part of the injection molding machine or the part to be injected.

〔Example〕

Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 2 shows a specific example of the present embodiment, and is a side view of an injecting part and an injected part of an injection molding machine.

8 is a nozzle, and 9 is a spool bush. The liquidized material is injected from the tip of the nozzle 8 all the way through the spool bushing 9 into the mold. Reference numeral 10 denotes a ceramic coating film in which a ceramic coating is applied on the nozzle 9.

The thermal conductivity of ceramic, which is a solid inorganic material, is about 1/10 to 1/15 of that of commonly used steel, and by applying a ceramic coating film 10, heat retention is improved. However, the plasticized material accumulated at the tip of the nozzle 8 will not solidify simply.

If you want to further improve heat retention, you can replace the material of the nozzle 8 with ceramic instead of steel, or you can use it as a material for the nozzle 8. The material itself may be made of ceramic.

〔effect〕

As mentioned above, the molding method using ceramic, which is a solid inorganic material, in the nozzle part improves the heat retention inside the nozzle, eliminates the drawbacks such as solidification of the material in the nozzle, and improves production efficiency. .

In addition, improved heat retention makes it possible to use ceramic for the tip of the nozzle or spool bushing, allowing molding to be performed with the nozzle pushed into the stool bushing, which speeds up the molding cycle and further increases production efficiency. .

[Brief explanation of the drawing]

Figure 1 is a diagram of the principle of a commonly used injection molding machine.
FIG. 2 is a side view of an injection part and an injection part showing an embodiment of the present invention. 8... Nozzle, 9... Stool fish, 10...
・Ceramic coating film or higher

Claims (1)

[Claims] A molding technique in which a material is softened by heating, forced into a closed mold, cooled, and then the solidified molded product is taken out. Molding is characterized by using a solid inorganic material in the part into which the material is pushed or into which it is pushed. Method.