Injection molding method for commercial vehicle sun shade

An injection molding and sunshade technology, which is applied in the field of commercial vehicle sunshade product molding technology, can solve the problem of high shear rate, and achieve the effect of ensuring the appearance effect and reducing the shear rate.

Inactive Publication Date: 2017-02-01
JIANGSU XINQUAN AUTOMOTIVE TRIM
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the shear rate is too high in the traditional injection mold gating system, and to provide an injection molding method for commercial vehicle sunshades that can effectively improve product quality

Method used

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  • Injection molding method for commercial vehicle sun shade
  • Injection molding method for commercial vehicle sun shade

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Embodiment Construction

[0015] See figure 1 and figure 2 , an injection molding method for a commercial vehicle sunshade, specifically comprising the steps of:

[0016] 1) The molten plastic passes through the main nozzle 1 of the intermediate hot runner, passes through the two-point hot runner 2 and then passes through the gate 3 of the intermediate cold runner, and enters the product cavity 8;

[0017] 2) Then open the second cold runner gate 4, the third cold runner gate 5, the fourth cold runner gate 6, and the fifth cold runner gate symmetrically arranged on both sides of the middle cold runner gate in order Gate 7, injecting plastic into the product cavity;

[0018] 3) Keep the injection pressure of each gate until the product cavity is fully filled.

[0019] In the above step 1), the inner valve needle and melt cavity of the two-point hot runner 2 are enlarged and polished.

[0020] The pressure-time curves of the above-mentioned cold runner gates are parabolic, the highest pressure range...

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Abstract

The invention relates to a manufacturing process of vehicle decoration pieces, in particular to a molding process for a commercial vehicle sun shade product. The process aims at solving the problem that the shearing rate in a traditional injection mold gating system is too high, and the product quality can be effectively improved through an injection molding method for a commercial vehicle sun shade. The injection molding method for the commercial vehicle sun shade particularly comprises the following steps that (1) melted plastic passes through a middle position hot runner main spraying nozzle, passes through two-point hot runners and then passes through a middle-position cold runner sprue to enter a product cavity; (2) a second cold runner sprue, a third cold runner sprue, a fourth cold runner sprue and a fifth cold runner sprue which are symmetrically arranged on the two sides of the middle-position cold runner sprue are opened in sequence, and the melted plastic is injected into the product cavity; and (3) the injection pressure at all sprues is kept until the product cavity is filled with the melted plastic.

Description

technical field [0001] The invention relates to a manufacturing process of an automobile trim, in particular to a forming process of a sunshade product for a commercial vehicle. Background technique [0002] With the improvement of living standards, people have higher and higher requirements for driving safety and comfort. In terms of commercial vehicles, they have a higher field of vision, a large front windshield, and bring stronger light at the same time. The angle facing the sun or the strong light at night will cause visual dizziness and other safety hazards. Therefore, in the design of passenger cars, a sunshade product whose width exceeds the front windshield is designed above the front windshield. The product belongs to the car The exterior decoration has high requirements for weather resistance and aging resistance, and requires impact strength ≥ 16KJ / m 2 , Tensile strength ≥ 40MPa, the product is generally defined as translucent, light transmittance ≤ 24%, in orde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C45/76B29C45/77B29L31/30
CPCB29C45/0025B29C45/76B29C45/77B29C2045/0032B29C2945/76498B29C2945/76561B29C2945/76752B29L2031/3035
Inventor 梁磊刘超李秀玲
Owner JIANGSU XINQUAN AUTOMOTIVE TRIM
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