Filter paper for cooling system in wire electrical discharge machining (WEDM) and production method of filter paper

A technology of a cooling system and a production method, applied in the field of papermaking, can solve the problems of short service life, large pore size of filter paper, deformation of filter paper, etc., and achieve the effects of improving dimensional stability, improving filtration precision and prolonging service life.

Inactive Publication Date: 2012-05-09
SUZHOU XINYE PAPER - MAKING
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are two main problems in the filter paper used in the wire cutting cooling system in the prior art: the first is that the service life is short, generally no more than 15 days; the second is that it is easy to fade , the filtrate appears black, and the filter paper is broken through and shoots water
The main reason for these problems is that the resin in the filter paper has poor water resistance. After a long time in the cooling liquid, the resin softens and dissolves in a small amount, which reduces the wet burst resistance and water resistance of the filter paper, resulting in deformation and breakout of the filter paper, and a short service life. ; In addition, the pore size of the filter paper is too large, the filtration accuracy is not enough, and some metal chips pass through the filter paper, causing the filtrate to appear black.

Method used

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  • Filter paper for cooling system in wire electrical discharge machining (WEDM) and production method of filter paper
  • Filter paper for cooling system in wire electrical discharge machining (WEDM) and production method of filter paper

Examples

Experimental program
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Effect test

Embodiment 1

[0063] Base paper absolute dry basis weight 115g / m 2 , the absolute dry basis weight of the paper is 150 g / m 2 . Slurry ratio: 60 parts of bleached coniferous pine pulp, 30 parts of bleached broad-leaved eucalyptus pulp, 5 parts of superfine glass fiber, 5 parts of polyester fiber, 0.8 parts of PPE wet strength agent and wet strength accelerator HBS-4B are added to the pulp 0.8 servings. The wire speed is 22 m / min, the mass concentration of coated phenolic resin is 20%, and the final coating amount is 23% (referring to the percentage of phenolic resin in the finished paper, calculated by weight: about 30 parts of phenolic resin). The test results are as follows: the paper air permeability is 85L / m 2 .s, the maximum pore size is 53μm, the average pore size is 34μm, the wet elongation is 0.7%, the wet bursting strength is 380KPa, the filtration precision is 8μm, the impurity removal rate reaches 99.3%, and the use time is 29 days.

Embodiment 2

[0065] Base paper absolute dry basis weight 120g / m 2 , the absolute dry weight of the paper is 160 g / m 2 , Slurry ratio: 65 parts of bleached coniferous pine pulp, 28 parts of bleached broad-leaved eucalyptus pulp, 3 parts of ultrafine glass fiber, 4 parts of polyester fiber, 0.5 part of PPE wet strength agent, wet strength accelerator HBS are added to the pulp -4B 0.7 parts. The speed of the wire part is 21 m / min, the mass concentration of the coated phenolic resin is 18%, and the final coating amount is 20% (referring to the percentage of the phenolic resin in the finished paper, calculated by weight: about 25 parts of the phenolic resin). The test results are as follows: the paper air permeability is 82L / m 2 .s, the maximum pore size is 51μm, the average pore size is 33μm, the wet elongation is 0.6%, the wet bursting strength is 420KPa, the filtration precision is 7μm, the impurity removal rate reaches 99.4%, and the use time is 30 days.

Embodiment 3

[0067] Base paper dry basis weight 135g / m2, finished paper dry basis weight 172 g / m2, pulp ratio: 68 parts of bleached coniferous pine pulp, 25 parts of bleached broad-leaved eucalyptus pulp, 2 parts of superfine glass fiber, 5 parts of polyester fiber 1 part, 1 part of PPE wet strength agent and 1 part of wet strength accelerator HBS-4B are added to the slurry. The speed of the wire part is 20 m / min, the mass concentration of the coated phenolic resin is 19%, and the final coating amount is 21% (referring to the percentage of the phenolic resin in the finished paper, calculated by weight: about 27 parts of the phenolic resin). The test results are as follows: the paper air permeability is 88L / m 2 .s, the maximum pore size is 54μm, the average pore size is 32μm, the wet elongation is 0.45%, the wet bursting strength is 490KPa, the filtration precision is 8μm, the impurity removal rate reaches 99.52%, and the use time is 34 days.

[0068] As can be seen from the above ...

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Abstract

The invention relates to filter paper for a cooling system in wire electrical discharge machining (WEDM), which comprises the following components in percent by weight: 18-25 percent of phenolic resin, 0.5-5 percent of glass fiber, 0.5-5 percent of polyester fiber and 65-82 percent of wood pulp fiber. A production method of the filter paper comprises the steps of pulping, pulp mixing, paper making, drying, glue setting and forming. The filter paper adopts the wood pulp fiber as the main material which is matched with a proportion of glass fiber and polyester fiber, so that the bore diameter of the filter paper can be reduced, and the filtering accuracy can be improved; and in addition, since the polyester is chemically-synthesized fiber and has high strength, the bursting strength of the filter paper is improved, and the service life of the filter paper is prolonged. In the production process of the filter paper, thermosetting phenolic resin is introduced by dipping setting glue, and the size stability, the high temperature resistance and the water resistance of the filter paper are further improved. When being applied to a cooling liquid circulating system in WEDM, the filter paper is not deformed or expanded and has good strength in water, and the phenomena of water jetting and black water generating due to bursting are avoided.

Description

technical field [0001] The invention belongs to the field of papermaking, and in particular relates to a filter paper for a cooling system processed by wire cutting and a production method thereof. Background technique [0002] With the development of my country's machinery industry, wire cutting technology has been widely used in manufacturing and processing fields such as molds, tools, and aerospace because of its high precision and high efficiency in metal cutting. Wire EDM is a processing method that directly utilizes electric energy and heat energy. It uses a moving electrode wire as a tool electrode to cut the workpiece. During wire cutting, electric sparks, metal shavings, and heat will be generated. Therefore, CNC EDM machines are generally equipped with a cooling system to cool the workpiece. The cooling system is composed of coolant, filter, delivery pump, etc. During wire cutting, the cooling system sprays coolant onto the workpiece to cool the workpiece and take...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H27/08D21H13/40D21H17/48
Inventor 王金夫
Owner SUZHOU XINYE PAPER - MAKING
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