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Water needle applied for water shaping production

A technology of water injection and water assistance, which is applied in the field of plastic hollow injection molding production system, can solve the problems that have not been seen, and achieve the effect of easy standardization, less assembly parts, flexible and stable left and right movement

Inactive Publication Date: 2009-11-18
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the world, there is no patent or related research report on a compact water needle that integrates water intake, air intake and drainage.

Method used

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  • Water needle applied for water shaping production
  • Water needle applied for water shaping production
  • Water needle applied for water shaping production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0021] like figure 1 As shown, the water needle used in the water-assisted molding production of the present invention includes: core rod 3, needle sleeve 4, springs 2 and 8, support limit ring 1, diversion limit ring 9, O-ring seals 5 and 10, Back-up ring 6 and O-ring 7. The support limit ring 1 and the needle cover 4 are installed in the water needle installation hole of the mold 12, the tapered small end of the needle cover 4 protrudes into the cavity 11 of the mold 12, and the small right end of the needle cover 4 extends into the cavity 11 The part is tapered, which makes it easy to take out the workpiece and reduces the marks on the surface of the workpiece. The needle sleeve 4 is equipped with a hollow core rod 3 with a large middle diameter and small ends. 4 forms a sliding fit, and one end of the core rod 3 and the protruding end of the needle cover 4 also form a sliding fit, and have a sealing effect, sealing the passage of the water in the needle cover 4 to the cav...

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Abstract

The invention discloses a water needle used in water-assisted molding production. It includes a needle sleeve, a core rod placed in the needle sleeve, a spring, a limit ring and a seal. There are water inlets and drains on the needle sleeve; the through hole in the middle of the support limit ring is the air inlet, and the slender through hole is opened in the core rod to form a gas passage; at the end where the water needle is connected to the cavity, the core rod and the needle The end of the sleeve cooperates to seal the passage of water to the cavity, the core rod is driven by the spring and the water inlet pressure or the inlet pressure to open the water inlet or drainage passage, the end fit and the reasonable setting of the vent hole size of the core rod prevent The plastic melt in the cavity enters the water needle. The invention realizes zero leakage of gas and water through the direct sealing between the needle sheath and the mould, the core rod and the needle sheath. The water needle can complete all the water supply and drainage functions of water intake, air intake and drainage required by the water-assisted molding technology, and has the characteristics of simple and compact structure and easy standardization. The invention is used for water-assisted molding production and is a key device of water-assisted molding technology.

Description

technical field [0001] The invention relates to a plastic hollow injection molding production system, in particular to a water needle used in water-assisted molding production. Background technique [0002] In the field of injection molding industry, water-assisted injection molding technology is a new technology developed in recent years, which belongs to fluid-assisted injection molding technology as well as gas-assisted injection molding technology. Compared with the more mature gas-assisted injection molding technology after more than ten years of development, water-assisted molding technology is still in its infancy, but water medium has the advantages of incompressibility, high thermal conductivity, and high specific heat capacity compared with gas, which makes water-assisted molding Compared with gas-assisted molding, molding has the advantages of shorter cooling time and molding cycle, higher product quality (smooth inner surface, uniform thickness, etc.), lower prod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C45/57
Inventor 周华张增猛杨华勇
Owner ZHEJIANG UNIV
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