Pre-deformation production method of injection molding products
A production method and technology for injection molding products, applied in the direction of coating, etc., to solve the deformation of the orifice, realize the profit, and shorten the mold making.
Active Publication Date: 2014-07-30
HENAN LIANSU IND
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[0004] The invention provides a production method for pre-deformation of injection molded products to solve the technical problems existing in the prior art
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[0031] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. However, this example does not limit the present invention.
[0032] 1) According to the injection molding theory, practical experience and material data provided by the material manufacturer, according to the formula =L0(1+δ)(where is the theoretical size of the cavity or core, L0 is the nominal size of the product, and δ is the shrinkage rate provided by the material manufacturer) to calculate the theoretical size of the cavity and core;
[0033] 2) Use injection molding simulation analysis software to conduct injection molding simulation analysis on the designed mold structure, set corresponding process conditions, and analyze the deformation direction and size of injection molded parts under the mold structure and optimized process;
[0034] 3) When making the mold for the first time, make a circular cavity and core according to...
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The invention relates to a production method of injection molding products, in particularly to a pre-deformation production method of injection molding products. The method comprises the following steps of: calculating the theoretical dimension L'' of products according to the nominal dimension L0 of the products and the shrinkage factor delta of materials adopted by the products; adopting a mold structure for manufacturing an initial mold of the products, carrying out injection molding production and obtaining the initial products; calculating the shrinkage factor theta' of the initial molds according to the dimension L' and L'' of the initial products; calculating the pre-deformation dimension L according to the nominal dimension L0 of the products and the shrinkage factor theta' of the initial mold; and carrying out mold trimming on the initial mold, carrying out injection molding production on the mold after the mold trimming, and obtaining the products subjected to the mold trimming. The method can effectively solve the problem of tubular injection mold product hole opening deformation, simultaneously, the mold manufacture and mold trimming times and the cost can be reduced, the mold manufacture and delivery time is shortened, and the benefit maximum is possibly realized.
Description
technical field [0001] The invention relates to a production method of injection molding products, in particular to a production method of pre-deformation of injection molding products. Background technique [0002] Thermoplastics exhibit viscoelasticity in the high-temperature molten state, and the rheological properties are affected by pressure, temperature, and speed. When the product is cooled and taken out of the mold cavity, volume shrinkage due to thermal shrinkage and crystallization occurs (all polymerization matter) and linear shrinkage (semi-crystalline polymers). Under the action of no external force, the volume shrinkage is isotropic, and the linear shrinkage is affected by the molecular orientation caused by stress and fillers. Therefore, different parts of the same injection molded product will have different shrinkage sizes and main directions. Determine the required cavity size. It is very difficult to obtain plastic products of specified dimensions. At pr...
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IPC IPC(8): B29C45/00
Inventor 宋财福
Owner HENAN LIANSU IND