Method for preventing leaking of molten metal in injection molding of metal material

一种熔融金属、注塑成型的技术，应用在熔融金属从铸包中浇注的控制、金属加工设备、制造工具等方向，能够解决难以取下冷插塞、大注塑阻力等问题，达到防止泄漏的效果

Inactive Publication Date: 2009-04-08
NISSEI PLASTIC IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] On the other hand, if the cold plug is excessively molded, it is difficult to remove the cold plug even if injection pressure is applied to it, resulting in greater injection resistance

Method used

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  • Method for preventing leaking of molten metal in injection molding of metal material
  • Method for preventing leaking of molten metal in injection molding of metal material
  • Method for preventing leaking of molten metal in injection molding of metal material

Examples

Experimental program
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Effect test

Embodiment Construction

[0028] In the drawings, reference numeral 1 denotes an injection cylinder. The injection cylinder 1 includes a cylinder body 12 having a nozzle 11 at a tip end thereof, and includes a plunger 2 arranged inside the cylinder body 12 so as to be able to travel forward and backward. The plunger 2 includes a plunger head 21 and a plunger rod 22, which are connected to the injection molding drive unit 3 located behind the injection molding cylinder. The plunger head 21 is adapted to travel from a rearward position A behind a supply opening 13 formed at an upper forward position of the cylinder 12 (see figure 2 ). Heating means using band heaters are installed on the outer peripheries of the nozzle 11 and the cylinder 12 so that the temperature of each heater is individually controlled.

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Abstract

This is provided a method for preventing leaking of molten metal from a nozzle in an injection apparatus provided with a plunger within a cylinder body, a supply opening formed in an upper portion of the cylinder body, and a furnace for melting and holding the metal material provided on a top portion of the injection cylinder and having an outlet at the bottom end of the furnace communicated with the supply opening. The method comprises the following steps: metering the molten metal by travel of the plunger head backward from the most forward position to the backward position at the rear of the supply opening while maintaining nozzle touching after completion of an injection step and supplying the molten metal from the furnace into the cylinder body through the supply opening, after completion of the metering, closing the supply opening by travel of the plunger head forward at low speed from the backward position to a stand-by position ahead of the supply opening for cutting off the communication between the molten metal in the cylinder body and the molten metal in the furnace.

Description

technical field [0001] The present invention relates to a method for preventing leakage of molten metal from occurring in an injection molding apparatus for metal forming, wherein metal material is supplied as molten metal from a metal material melting holding furnace into an injection molding cylinder in which a plunger is installed, and is passed through The plunger is used to complete the dosing and injection molding of molten metal. Background technique [0002] When the nozzle installed at the tip of the injection cylinder contacts the cold mold to inject molten metal from the injection cylinder into the mold, and the nozzle contact continues after injection molding, the nozzle passes the "coldness" transferred from the mold It is cooled and the molten metal held within the nozzle solidifies to form a metal plug known as a "cold plug". The inside of the tip of the nozzle is closed by the cold plug, so even if the nozzle is separated from the mold, there will not be any...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D17/20B22D17/30
CPCB22D17/2015B22D37/00B22D17/30B22D17/04B22D17/32
Inventor 南村正昭竹内康彦甲田纪泰宫川守上平郁雄河野卓
Owner NISSEI PLASTIC IND CO LTD
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