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3D precision shaping method of conformal cooling structure of injection mold

A technology of conformal cooling and injection molding, which is applied in the field of mold manufacturing, can solve problems such as low strength of welded joints, influence on surface accuracy, and large amount of welding deformation, and achieve high production efficiency, low production cost, high strength and precision.

Inactive Publication Date: 2015-12-09
XIAN ZHITUO PRECISION WELDING
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, when the welding pressure is high, it will lead to a large amount of welding deformation, especially when welding complex multi-layer structures (such as curved surface structures, hollow structures, etc.), due to the inhomogeneity of welding pressure on complex structures, it will lead to collapse, String cavity, etc., the welding deformation is large, which seriously affects the surface accuracy; when the welding pressure is small, the connection interface is obvious, and the strength of the welded joint is low

Method used

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  • 3D precision shaping method of conformal cooling structure of injection mold
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Examples

Experimental program
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Effect test

Embodiment 1

[0041] Using Cu as the 3D precision molding method of the injection mold conformal cooling structure of the diffusion welding intermediate layer, the steps are as follows:

[0042] The type of die steel is P20.

[0043] Aiming at the surface profile of the injection mold cavity, based on the heat transfer calculation, a three-dimensional model of the conformal cooling channel for efficient heat exchange is established, as follows: figure 1 shown, according to figure 1 The semicircular mold cavity 2 establishes a three-dimensional model of the conformal cooling channel. The cooling medium enters from the inlet 3, realizes a three-dimensional serial flow channel along the conformal cooling channel (1.1 and 1.2), and finally reaches the cooling medium outlet 4.

[0044] Based on the basic principle of easy processing, the layer structure of the three-dimensional model of the conformal cooling channel is divided, as follows figure 2As shown, the entity is divided into layer st...

Embodiment 2

[0053] The 3D precision molding method of the conformal cooling structure of the injection mold using Au as the diffusion welding intermediate layer differs from Example 1 in that:

[0054] The middle layer of diffusion welding is 5mm thick Au foil.

[0055] Place the assembled parts to be welded in a vacuum diffusion welding furnace, close the furnace door, and pump the furnace body to a vacuum degree of 10 -3 Pa. Then raise the welding temperature to 1094°C, pressurize at 0.5MPa, and keep the temperature for 1h. After the heat preservation is over, the pressure is released, and the weldment is cooled with the furnace. Realize the precise and high-strength connection of each layer structure.

Embodiment 3

[0057] Adopting Mn as the 3D precision molding method of the injection mold conformal cooling structure of the diffusion welding intermediate layer, the difference from Example 1 is:

[0058] Aiming at the contour of the cavity surface of the injection mold, based on the heat transfer calculation, a three-dimensional model of the conformal cooling channel for efficient heat exchange is established, as follows: image 3 shown, according to image 3 A three-dimensional model of the conformal cooling channel is established in the circular mold cavity 13 . The cooling medium enters from the inlet 11 , realizes a three-dimensional serial flow channel along the conformal cooling channels ( 14.1 and 14.2 ), and finally reaches the cooling medium outlet 12 .

[0059] Based on the basic principle of easy processing, the layer structure of the three-dimensional model of the conformal cooling channel is divided. Specific as Figure 4 shown. Divide the entity into layer structures alo...

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Abstract

Provided is a 3D precision shaping method of a conformal cooling structure of an injection mold. Based on heat transfer calculation, an efficient heat exchange conformal cooling flow channel three-dimensional model is established for the cavity face contour of the injection mold, layered structural division is performed on the conformal cooling flow channel three-dimensional model, corresponding structures in different layers are machined through a machining method, a laser method or a chemical etching method, and the structures in different layers are stacked and positioned according to corresponding sequence. The layered structures are welded through a diffusion welding method achieved by adding an intermediate layer, and 3D precision shaping of a conformal cooling flow channel is achieved; finally, a mold cavity is machined in a diffusion welding solid surface through a machining method, and 3D precision shaping of the conformal cooling structure of the injection mold is completed. By means of the method, the design space can be greatly expanded, and conformal cooling structures in any complicated shape can be manufactured. High strength and high precision of the conformal cooling structure is guaranteed, production cost is low, production efficiency is high, and the requirement for batch industrial production can be met.

Description

technical field [0001] The invention belongs to the technical field of mold manufacturing, and in particular relates to a 3D precision molding method for a conformal cooling structure of an injection mold. Background technique [0002] In the traditional injection mold cooling channel design, due to the limitation of manufacturing methods, only simple cooling channels can be used (such as turning, milling, planing, drilling, grinding, electroerosion, etc. for metal blanks), and cannot produce such as conformal cooling Three-dimensional complex cooling systems such as runners. [0003] The literature "Key Technologies and Research Progress of Injection Mold Cooling System" pointed out that the cooling system has a significant impact on the molding of plastic parts and is mainly manifested in: a. During the injection molding process, the cooling time accounts for about 50% to 80% of the molding cycle. The cooling system The improvement of production efficiency is crucial to t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C33/38B29C45/73B29C45/26B33Y30/00
Inventor 李鹏飞王莉敏邵长斌徐华辉孙福
Owner XIAN ZHITUO PRECISION WELDING
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