Injection moulding method of digit wheel and mould thereof

Abstract

The invention discloses an injection moulding method of a digit wheel and a mould thereof. The method comprises the following steps: closing and molding a font front mould and a rear mould, opening the font front mould and the rear mould, rotating a rotating disc of a double-colored injection machine, rotating the rear mould to a second forming position, closing and molding the rear mould and a wheel body front mould, opening the wheel body front mould and the rear mould, pushing a product out, rotating the rear mould to a first forming position, and the like. The digit wheel mould comprises the front mould and the rear mould, wherein the front mould is a font core front mould, and the rear mould is a font core rear mould. By adopting the digit wheel mould, plastic digits on a digital display measuring meter can not be printed on the surface of the product by a rotary printing process any more, but the model product produced by directly adopting the digit wheel mould, therefore, not only the production process for producing the digit display measuring meter is reduced, the cost is saved, but also any pollution to the environment can not be generated, and the mould is very economicand practical.

Description

technical field [0001] The invention relates to an injection mold, in particular to a digital wheel injection molding method and a mold thereof. Background technique [0002] At present, the plastic numbers on the digital display measuring instruments in China are all injection-molded, and symbols such as numbers or scales are printed on the products with a rotary printing process. The so-called rotary printing is completed by pad printing, silk screen printing, hot stamping and other processes. To complete this process, not only a large amount of chemical auxiliary items such as ink and film are required, but also a large number of manual operations are required. In this way, the rotary printing process is used. There are following disadvantages in realizing digital display plastic numbers on measuring instruments: on the one hand, due to the application of a large number of chemical auxiliary items such as inks and films, volatile toxic and harmful gases will be produced, ...

AI Technical Summary

Problems solved by technology

The so-called rotary printing is completed by pad printing, silk screen printing, hot stamping and other processes. To complete this process, not only a large amount of chemical auxiliary items such as ink and film are required, but also a large number of manual operations are required. In this way, the rotary printing process is used. There are following disadvantages in realizing digital display plastic numbers on measuring instruments: on the one hand, due to the application of a large number of chemical auxiliary items such as inks and films, volatile toxic and harmful gases will be produced, which will pollute the environment and affect human health; on the other hand, it is necessary to use a large number of Manual operation, not only high labor cost, low production efficiency and unable to meet the requirements of industrial automation, but also a large number of human operations will lead to unstable product quality, with a defect rate as high as 20-30%; moreover, the number obtained through the rotary printing process Or the scale marks are only printed on the surface of the product. Over time, these numbers or scale marks will be worn away, so they can only be obtained by reprinting.

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