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Method for controlling mold cavity resin pressure of injection molding machine

A cavity pressure and pressure control technology, applied in the field of injection molding, can solve problems such as poor precision and stability, and inability to control product quality

Inactive Publication Date: 2009-12-30
无锡威锐科智能测控技术有限公司
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AI Technical Summary

Problems solved by technology

[0008] The injection molding control of the traditional injection molding machine all adopts the hydraulic control of the forward speed and forward pressure of the screw, which cannot freely control the quality of the product. It is an indirect method of controlling the quality of the product, and its accuracy and stability are poor.

Method used

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  • Method for controlling mold cavity resin pressure of injection molding machine
  • Method for controlling mold cavity resin pressure of injection molding machine
  • Method for controlling mold cavity resin pressure of injection molding machine

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Embodiment Construction

[0027] The present invention comprises the following steps:

[0028] Step 1: Set the detection position of the pressure sensor; firstly, investigate the pressure distribution of each part of the product, and then use the membrane cavity pressure sensor for the purpose of monitoring the molding conditions and controlling the quality of the product. The detection position of the pressure sensor is generally divided into two situations: 1. When the product is perpendicular to the sprue, the detection position is set near the main flow channel. 2. When the product is located on both sides of the sprue and the joint part, set the detection position near a part of the main flow channel. In addition, the stagnant part and bifurcation point of the resin need to be avoided and the selected path must be the path that the end part of the resin must pass through.

[0029] Step 2: Use the sensor to detect the cavity pressure before the cavity fully reaches the set value of the cavity pres...

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Abstract

The invention relates to a principle and a method for controlling the mold cavity resin pressure of an injection molding machine. According to the technical scheme provided by the invention, the method for controlling the mold cavity resin pressure of an injection molding machine comprises the following steps: firstly, setting the detection position of a pressure sensor, wherein during setting, the detection position of the pressure sensor is arranged close to a main flow passage of the cavity when a mold cavity is directly arranged below a sprue gate, and the detection position of the pressure sensor is arranged close to a branch flow passage when the mold cavity is arranged at both sides of the sprue gate; and secondly, during the injection molding control, the pressure in the mold cavity gradually rises along with materials constantly entering into the mold cavity; in the whole entering process of the materials, the pressure sensor is utilized to instantly detect the actual pressure in the mold cavity before the pressure in the mold cavity reaches the set value of the pressure in the mold cavity and to instantly send the pressure value to a controller which controls the pressure in the mold cavity by calculating the approaching speed of the actual pressure in the mold cavity to the set value of the pressure in the mold cavity. The method can effectively enhance the quality and the precision of produced products and lower the cost.

Description

technical field [0001] The invention relates to an injection molding technology, in particular to a principle and method for controlling resin pressure in a mold cavity of an injection molding machine. Background technique [0002] Injection molding (Injection Molding) refers to heating the resin material and making the resin into a molten state under the action of mechanical shear stress, and injecting the heat-melted plastic into a closed mold cavity by high pressure, after cooling and solidification A cyclic process for obtaining shaped products. This method is suitable for mass production of parts with complex shapes and is one of the important processing methods. Injection molding machine (referred to as injection molding machine or injection machine) is the most suitable industrial device for mass production today. [0003] Nowadays, plastic products are widely used in social life, ranging from daily necessities to home appliance parts, auto parts, industrial compone...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C45/77
Inventor 朱留存
Owner 无锡威锐科智能测控技术有限公司
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