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Digital design method of automobile rear windshield glass hot press molding die

A rear windshield and hot-press forming technology, which is applied in glass forming, glass tempering, glass reshaping, etc., can solve the problems of difficult mold development and molding process optimization, long cycle time, and high cost

Pending Publication Date: 2022-03-11
FUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This trial and error method has a long period, high cost, and affects the development cycle of the whole vehicle. It is increasingly unable to meet the fierce competition environment of the automobile market and the individual needs of customers. The mold design of automobile windshield glass has become an influential An important factor in the development of the automotive industry, especially the preparation of large spherical glass, it is more difficult to develop molds and optimize molding processes

Method used

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  • Digital design method of automobile rear windshield glass hot press molding die
  • Digital design method of automobile rear windshield glass hot press molding die
  • Digital design method of automobile rear windshield glass hot press molding die

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Embodiment Construction

[0038] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0039] This embodiment takes the digital design of the mold for the rear windshield of a certain type of automobile as an example, including the following steps:

[0040] Considering the viscoelastic properties of the glass material, its three-dimensional transient viscoelastic constitutive equation under large strain is deduced, and its integral form is

[0041]

[0042] where e is the shear modulus, ε is the bulk strain, τ is the reduced time from the non-equilibrium state to the equilibrium state, G is the shear modulus, K is the bulk modulus, t is the real time, I is a unit tensor.

[0043] G(t) and K(t) in the above formula are replaced by Prony series, we get

[0044]

[0045]

[0046] In the formula, G(∞), G i is the shear modulus of the Maxwell element, K(∞), K i is the bulk modulus of the Maxwell element, τ i G Corresponds to the...

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Abstract

The invention relates to a digital design method of an automobile rear windshield glass hot-press forming mold, which comprises the following steps of: S1, constructing a geometric model of automobile rear windshield glass hot-press forming production line equipment, and obtaining basic forming process parameters and working conditions; s2, constructing a finite element simulation model of the glass which is put into production stably; s3, new target glass without a forming mold is set as an initial mold molded surface, and a first mold is constructed; s4, taking viscoelasticity characteristics of a glass material into consideration, substituting a sheet glass original sheet and a first mold into the finite element simulation model in the step S2, and calculating to obtain a glass digital molded surface formed for the first time; s5, calculating the dimensional deviation between the formed glass and the target glass, and if the difference value does not meet the preset precision requirement, compensating the deviation value to obtain a new mold digital file; and S6, replacing the mold of the simulation model with a new mold digital file, importing the new mold digital file, and repeating the step S5 until the mold meeting the precision requirement of the target glass is obtained.

Description

technical field [0001] The invention relates to the field of design of automotive rear windshield glass forming molds, in particular to a digital design method of an automotive rear windshield glass hot pressing forming mold. Background technique [0002] Automotive glass is not only an automotive structural part, but also a functional part, which requires an organic unity of beautiful shape and size, strength and functional characteristics. With the rapid development of the automotive industry, the design and manufacture of automotive glass is in urgent need of rapid response to customers' high-quality and individual requirements. The traditional design method of automobile windshield glass forming mold is mainly a trial and error method. The glass forming method can only be determined by the technical personnel after a large number of glass trial production experiments. The process parameters for mass production. This trial-and-error method has a long cycle and high cost,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B23/023C03B27/04G06F30/23
CPCC03B23/023C03B27/04G06F30/23
Inventor 吴波张隆昆何智汉赵艳
Owner FUZHOU UNIV
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