Spiral flow fluidity testing mould

A technology for testing mold and fluidity, applied in the direction of flow characteristics, measuring devices, instruments, etc., can solve the problems of limited research and application scope, unable to reflect fluid fluidity, unable to eliminate experimental errors, etc., to eliminate experimental errors and mold structure. Compact, full-featured effects

Inactive Publication Date: 2009-06-10
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 3) The flow length marking point of the spiral mold is located at the bottom of the cavity, and the experimental data of the spiral flow length can only be read after the experimental sample is demoulded, which cannot eliminate the experimental error caused by the deformation of the sample under the action of external force during demoulding;
[0008] 4) The spiral mold is not designed with a mold temperature control structure, so that the mold cannot be used to test and study the fluidity of fluid at different mold temperatures;
[0009] 5) The cavity of the spiral mold adopts the Archimedes helix. During the fluid test, the flow route is smooth and the cavity cross-section is a semicircle with a fixed size, which cannot reflect the fluidity of the fluid under the condition of sudden change of the flow route, and different Fluid mobility under the section of the shape cavity;
[0010] 6) The test object of this mold is limited to polymer melt, and the scope of research and application is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1: Under the same injection molding process conditions, the fluidity comparison test of PE-2909 and PP-T30S.

[0041] Stack the supporting block 2 and the heating plate 3 on the mold seat plate 1 in sequence, place the heating rod 4 and the heating rod 14 in the through hole of the heating plate 3, there is a stepped hole on the moving template 5, and the guide sleeve 6 is placed on the moving plate In the stepped hole of the template 5, there is an inlay guide rail in the movable template 5, and the movable template panel 13 is inserted into the movable template 5 through the guide rail for fastening connection. Installed on the movable mold panel through threaded holes, the mold seat plate 1, the support pad 2, the heating plate 3 equipped with heating rods, and the movable template 5 equipped with the movable mold panel and guide sleeve are positioned and connected by long pins 15 , fastened by long screws 21, the fixed template 8 equipped with the sprue bush...

Embodiment 2

[0046] Example 2: Fluidity test of PP-T30S under different cavity cross-sectional shapes and different forms of helical cavity conditions

[0047] The test object is thermoplastic polypropylene (PP), the grade is T30S. The test content is to test the fluidity of the fluid under the conditions of sudden change of direction and smooth transition of the cavity and the fluidity of the fluid under the condition of different shapes of the cavity section. Under the same injection molding process conditions, the fluidity of PP-T30S was tested three times with three different cross-sectional shapes and spiral form movable templates. The injection molding process conditions are set as follows: melt temperature 220°C, injection pressure 80Mpa, injection rate 130g / s. After the experiment, the lengths of the helix samples were obtained: the helix length of the archimedes helix cavity with a semicircular section is 708mm, the helix length of the archimedes helix cavity with a rectangular se...

Embodiment 3

[0048] Example 3: Under the conditions of different injection molding processes and different rectangular gate sizes, W-Ni-Fe metal powder feed fluidity test and the relationship between fluidity, process parameters and gate size.

[0049] The test object is W-Ni-Fe metal powder feed (wt 98%, vol 58%), W:Ni:Fe=94:4:1 (weight percentage), binder is HDPE—PW—EVA—SA, The average particle size of the powder is 2~8μm, approximately spherical. The test content is the fluidity test of W-Ni-Fe metal powder feeding and the relationship between fluidity, process parameters and gate size under different injection molding processes and different rectangular gate sizes. Archimedes spiral moving formwork with semicircular section and 6 replaceable gate inserts in the form of rectangular side gates are adopted. Add W-Ni-Fe metal powder and HDPE-PW-EVA-SA binder into a mixer, melt and knead for 30 minutes, then cool and granulate to obtain feed for injection molding. Put the feed material in...

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Abstract

This invention relates to a spiral flow fluidity testing mould, which comprises mainly a mould base with support block, a heating pad, a movable mould panel with a gate inlay on center and a mosaic block arranged on a movable template by an embedded guide for convenient assembly, and a static template. Wherein, the spiral cavity can be used to closed research or open research. This invention has well versatility and compact structure for wide application.

Description

technical field [0001] The invention relates to a fluid fluidity testing mold and a testing method thereof, in particular to a multipurpose spiral fluid fluidity testing mold and a testing method thereof, belonging to the technical fields of material testing technology and mold design and manufacture. Background technique [0002] In the injection molding process, the melt fluidity is usually used as the evaluation of the forming performance of the melt. There are many indicators to measure the fluidity of the melt, such as apparent viscosity, melt index, Archimedes spiral length, flow length ratio, flow index, etc., but it is difficult to use a certain indicator to comprehensively evaluate the formability of the melt . Therefore, according to the different uses, the corresponding reference standards and corresponding test methods for melt fluidity have been formulated. At present, the melt fluidity measurement methods mainly include: capillary rheometer and torque rheomet...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N11/00
Inventor 蒋炳炎谢磊彭华建
Owner CENT SOUTH UNIV
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