Equipment and method used for measuring friction coefficient between plastic and metal mold

A technology for measuring devices and metal molds, applied in measuring devices, adopting mechanical devices, analyzing materials, etc., can solve problems such as long time for setting temperature, slow temperature rise of incubator, low calculation accuracy, etc., and achieve the measurement process and method Convenience, ease of operation, and the effect of expanding the measurement range

Inactive Publication Date: 2013-10-02
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the measurement method of adjusting the temperature through the incubator obviously cannot truly reflect the microcosmic bonding state of the actual product and the surface of the core, so the measurement result has a large error; at the same time, the temperature of the incubator rises slowly, and the experimental equipment needs to reach the set temperature. longer time
However, the reverse derivation method is feasible in principle, but due to the low calculation accuracy of the existing demoulding force calculation formula itself, there is a large gap between the calculation results and the experimental measurement results.

Method used

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  • Equipment and method used for measuring friction coefficient between plastic and metal mold
  • Equipment and method used for measuring friction coefficient between plastic and metal mold
  • Equipment and method used for measuring friction coefficient between plastic and metal mold

Examples

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Embodiment 1

[0022] Example 1 Using a high-density polyethylene (HDPE) material test piece, when the demoulding temperature is 20°C to 80°C, the surface roughness of the 45 steel core is measured at Ra0.8μm, Ra0.4μm and Ra0.2μm friction coefficient, the measured result curve is as follows image 3 shown. It can be seen from the curve in the figure that the friction coefficient values ​​at different measurement temperatures are all greater than the friction coefficient value of HDPE material and steel given in the relevant manual 0.109. It shows that the friction coefficient value between the plastic product and the metal mold at the demoulding temperature measured by the method of the present invention is more in line with the state during actual molding processing. The specific implementation method is that the 45 steel metal plate 4 with a surface roughness polished to Ra0.8 μm is fixed on the measuring table 10 through the countersunk screw 5, and then the test piece 3 made of HDPE mat...

Embodiment 2

[0023] Example 2 Using high-density polyethylene (PP) material specimens, when the demoulding temperature is 20°C to 80°C, the surface roughness of the 45 steel core is measured at Ra0.8μm, Ra0.4μm and Ra0.2μm friction coefficient, the measured result curve is as follows image 3 shown. It can be seen from the curve in the figure that the friction coefficient value varies greatly under different measurement temperatures; while the friction coefficient value between PP material and steel given in the relevant manual is 0.316. It can be seen that the friction coefficient value between the plastic product and the metal mold at the demoulding temperature measured by the method of the present invention is more in line with the actual situation during injection molding processing. The specific implementation method is that the 45 steel metal plate 4 with a surface roughness polished to Ra0.8 μm is fixed on the measuring table 10 through the countersunk screw 5, and then the test pi...

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Abstract

The invention discloses equipment and a method used for measuring the friction coefficient between plastic and a metal mold, belongs to the field of precision plastic product moulding and mould technology research, and relates to the equipment and method used for measuring the virtual friction coefficient between a plastic product and the surface of a mold core of the metal mold. The measuring equipment comprises a supporting platform assembly, a temperature controlling system and a force measuring unit; the temperature controlling system comprises a heating unit and a cooling unit; and the force measuring unit comprises a digital forcemeter with peak holding function, and a hauling rope. A replaceable measuring metal plate is applied in the equipment of the invention, so that the measuring range is extended; virtual contacting conditions of the surface of the product and the surface of the mold core of the metal mold can be simulated when the products made of different polymer materials are moulded; and the virtual friction coefficient between friction surfaces can be measured accurately. Characteristics of the equipment are that, measuring range is wide, temperature control accuracy is high, the structure is simple, the measurement is convenient, results are reliable, and the equipment is capable of meeting requirements of different practical applications.

Description

technical field [0001] The invention belongs to the field of precise plastic product forming and mold technology research, and relates to a measuring device and a measuring method for the actual friction coefficient between a plastic product and a metal mold core surface during injection molding. Background technique [0002] With the rapid development of modern industrial technology, the demand for plastic injection molding products in various industrial fields is increasing, and the quality requirements for injection molding products are also increasing, which puts forward higher requirements for injection mold design. The push-out mechanism is one of the main functional structures of the injection mold, and it is responsible for pushing out the product smoothly without deformation or cracking after it is formed. After the product is formed and solidified, it will have a great holding force on the mold core. When the product is released from the mold, it is necessary to o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N19/02
Inventor 于同敏焦旭林晓林永恒蒋天明武永强
Owner DALIAN UNIV OF TECH
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