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Injection molding machine

An injection molding machine and pressure technology, applied in the field of injection molding machines, can solve problems such as pressure drop, and achieve the effect of suppressing excessive retreat

Pending Publication Date: 2021-10-01
SUMITOMO HEAVY IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] On the other hand, it is considered that when the pressure in the cylinder exceeds a predetermined value, if the screw continues to retreat at a faster speed in order to reduce the pressure in the cylinder earlier, the screw retracts excessively and the pressure in the cylinder drops. excessive

Method used

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Embodiment Construction

[0019] Hereinafter, modes for implementing the present invention will be described with reference to the drawings. The present invention is not limited to the respective embodiments, and the constituent elements can be modified and embodied within a range not departing from the gist. Furthermore, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in each embodiment. For example, several constituent elements may be removed from all constituent elements shown in the embodiments. Furthermore, components of different embodiments may be appropriately combined.

[0020] figure 1 is a configuration diagram showing an injection molding machine 1 according to an embodiment of the present invention, figure 2 is more detailed figure 1 The cross-sectional view of the screw rod 21 and the link 245, image 3 is along figure 2 Sectional view of the line III-III section. figure 1 The illustrated injection molding machine 1 is an ...

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PUM

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Abstract

The present invention provides an injection molding machine capable of suppressing excessive retreating of a screw and preventing the pressure of a molding material in a front end portion of the cylinder from becoming a negative pressure. The injection molding machine (1) of the present invention is provided with: an injection molding device (2) having a cylinder body (20) provided with a nozzle (201) at a front end, a screw rod (21) arranged to advance and retreat within the cylinder body (20) and by advancing the molding material accumulated in the front end portion of the cylinder body (20) from the nozzle (201), and a pressure sensor (26) for detecting the pressure of the molding material in the front end portion.; and a control device (3) for controlling the injection molding device (2), and when the detection pressure of the pressure sensor (26) during advancing of the screw (21) becomes more than a threshold, the control device (3) stops the screw (21) after retreating the screw (21), and the back of the screw stops setting for the target including at least 3 stages.

Description

technical field [0001] This application claims priority based on Japanese Patent Application No. 2020-064643 filed on March 31, 2020. The entire content of this application is used in this specification by reference. [0002] The invention relates to an injection molding machine. Background technique [0003] For example, as shown in the following patent document 1, in an injection molding machine, the molding material melted in the cylinder is injected into the closed mold by advancing the screw, and then it is formed through processes such as holding pressure and cooling. moldings. When injection molding material from the cylinder, the pressure in the cylinder may rise due to the influence of material temperature, etc. Excessive pressure rise will damage the mold, cylinder, etc., so when an abnormality (abnormal pressure rise) is detected, the operation of stopping the screw is performed. [0004] In Patent Document 1, it is proposed that the pressure prediction value ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C45/50B29C45/77
CPCB29C45/50B29C45/77B29C2945/76498B29C2945/76665
Inventor 坂井峻弥丸本洋嗣
Owner SUMITOMO HEAVY IND LTD